style(encryption): suppress clippy unwrap lints with justifications

Reviewed-on: #29
Reviewed-by: Stas <business@jexter.tech>

.gitignore

@@ -1,3 +1,4 @@
 target/
 scripts/__pycache__/
 .DS_Store
+.cargo/config.toml

.vscode/settings.json

@@ -1,3 +1,2 @@
 {
-    "git.enabled": false
 }

AGENTS.md

@@ -0,0 +1,128 @@
+# AGENTS.md
+
+This file provides guidance to Codex (Codex.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Arbiter is a **permissioned signing service** for cryptocurrency wallets. It consists of:
+- **`server/`** — Rust gRPC daemon that holds encrypted keys and enforces policies
+- **`useragent/`** — Flutter desktop app (macOS/Windows) with a Rust backend via Rinf
+- **`protobufs/`** — Protocol Buffer definitions shared between server and client
+
+The vault never exposes key material; it only produces signatures when requests satisfy configured policies.
+
+## Toolchain Setup
+
+Tools are managed via [mise](https://mise.jdx.dev/). Install all required tools:
+```sh
+mise install
+```
+
+Key versions: Rust 1.93.0 (with clippy), Flutter 3.38.9-stable, protoc 29.6, diesel_cli 2.3.6 (sqlite).
+
+## Server (Rust workspace at `server/`)
+
+### Crates
+
+| Crate | Purpose |
+|---|---|
+| `arbiter-proto` | Generated gRPC stubs + protobuf types; compiled from `protobufs/*.proto` via `tonic-prost-build` |
+| `arbiter-server` | Main daemon — actors, DB, EVM policy engine, gRPC service implementation |
+| `arbiter-useragent` | Rust client library for the user agent side of the gRPC protocol |
+| `arbiter-client` | Rust client library for SDK clients |
+
+### Common Commands
+
+```sh
+cd server
+
+# Build
+cargo build
+
+# Run the server daemon
+cargo run -p arbiter-server
+
+# Run all tests (preferred over cargo test)
+cargo nextest run
+
+# Run a single test
+cargo nextest run <test_name>
+
+# Lint
+cargo clippy
+
+# Security audit
+cargo audit
+
+# Check unused dependencies
+cargo shear
+
+# Run snapshot tests and update snapshots
+cargo insta review
+```
+
+### Architecture
+
+The server is actor-based using the **kameo** crate. All long-lived state lives in `GlobalActors`:
+
+- **`Bootstrapper`** — Manages the one-time bootstrap token written to `~/.arbiter/bootstrap_token` on first run.
+- **`KeyHolder`** — Holds the encrypted root key and manages the Sealed/Unsealed vault state machine. On unseal, decrypts the root key into a `memsafe` hardened memory cell.
+- **`MessageRouter`** — Coordinates streaming messages between user agents and SDK clients.
+- **`EvmActor`** — Handles EVM transaction policy enforcement and signing.
+
+Per-connection actors live under `actors/user_agent/` and `actors/client/`, each with `auth` (challenge-response authentication) and `session` (post-auth operations) sub-modules.
+
+**Database:** SQLite via `diesel-async` + `bb8` connection pool. Schema managed by embedded Diesel migrations in `crates/arbiter-server/migrations/`. DB file lives at `~/.arbiter/arbiter.sqlite`. Tests use a temp-file DB via `db::create_test_pool()`.
+
+**Cryptography:**
+- Authentication: ed25519 (challenge-response, nonce-tracked per peer)
+- Encryption at rest: XChaCha20-Poly1305 (versioned via `scheme` field for transparent migration on unseal)
+- Password KDF: Argon2
+- Unseal transport: X25519 ephemeral key exchange
+- TLS: self-signed certificate (aws-lc-rs backend), fingerprint distributed via `ArbiterUrl`
+
+**Protocol:** gRPC with Protocol Buffers. The `ArbiterUrl` type encodes host, port, CA cert, and bootstrap token into a single shareable string (printed to console on first run).
+
+### Proto Regeneration
+
+When `.proto` files in `protobufs/` change, rebuild to regenerate:
+```sh
+cd server && cargo build -p arbiter-proto
+```
+
+### Database Migrations
+
+```sh
+# Create a new migration
+diesel migration generate <name> --migration-dir crates/arbiter-server/migrations
+
+# Run migrations manually (server also runs them on startup)
+diesel migration run --migration-dir crates/arbiter-server/migrations
+```
+
+## User Agent (Flutter + Rinf at `useragent/`)
+
+The Flutter app uses [Rinf](https://rinf.cunarist.org) to call Rust code. The Rust logic lives in `useragent/native/hub/` as a separate crate that uses `arbiter-useragent` for the gRPC client.
+
+Communication between Dart and Rust uses typed **signals** defined in `useragent/native/hub/src/signals/`. After modifying signal structs, regenerate Dart bindings:
+
+```sh
+cd useragent && rinf gen
+```
+
+### Common Commands
+
+```sh
+cd useragent
+
+# Run the app (macOS or Windows)
+flutter run
+
+# Regenerate Rust↔Dart signal bindings
+rinf gen
+
+# Analyze Dart code
+flutter analyze
+```
+
+The Rinf Rust entry point is `useragent/native/hub/src/lib.rs`. It spawns actors defined in `useragent/native/hub/src/actors/` which handle Dart↔server communication via signals.

CLAUDE.md

@@ -0,0 +1,128 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Arbiter is a **permissioned signing service** for cryptocurrency wallets. It consists of:
+- **`server/`** — Rust gRPC daemon that holds encrypted keys and enforces policies
+- **`useragent/`** — Flutter desktop app (macOS/Windows) with a Rust backend via Rinf
+- **`protobufs/`** — Protocol Buffer definitions shared between server and client
+
+The vault never exposes key material; it only produces signatures when requests satisfy configured policies.
+
+## Toolchain Setup
+
+Tools are managed via [mise](https://mise.jdx.dev/). Install all required tools:
+```sh
+mise install
+```
+
+Key versions: Rust 1.93.0 (with clippy), Flutter 3.38.9-stable, protoc 29.6, diesel_cli 2.3.6 (sqlite).
+
+## Server (Rust workspace at `server/`)
+
+### Crates
+
+| Crate | Purpose |
+|---|---|
+| `arbiter-proto` | Generated gRPC stubs + protobuf types; compiled from `protobufs/*.proto` via `tonic-prost-build` |
+| `arbiter-server` | Main daemon — actors, DB, EVM policy engine, gRPC service implementation |
+| `arbiter-useragent` | Rust client library for the user agent side of the gRPC protocol |
+| `arbiter-client` | Rust client library for SDK clients |
+
+### Common Commands
+
+```sh
+cd server
+
+# Build
+cargo build
+
+# Run the server daemon
+cargo run -p arbiter-server
+
+# Run all tests (preferred over cargo test)
+cargo nextest run
+
+# Run a single test
+cargo nextest run <test_name>
+
+# Lint
+cargo clippy
+
+# Security audit
+cargo audit
+
+# Check unused dependencies
+cargo shear
+
+# Run snapshot tests and update snapshots
+cargo insta review
+```
+
+### Architecture
+
+The server is actor-based using the **kameo** crate. All long-lived state lives in `GlobalActors`:
+
+- **`Bootstrapper`** — Manages the one-time bootstrap token written to `~/.arbiter/bootstrap_token` on first run.
+- **`KeyHolder`** — Holds the encrypted root key and manages the Sealed/Unsealed vault state machine. On unseal, decrypts the root key into a `memsafe` hardened memory cell.
+- **`MessageRouter`** — Coordinates streaming messages between user agents and SDK clients.
+- **`EvmActor`** — Handles EVM transaction policy enforcement and signing.
+
+Per-connection actors live under `actors/user_agent/` and `actors/client/`, each with `auth` (challenge-response authentication) and `session` (post-auth operations) sub-modules.
+
+**Database:** SQLite via `diesel-async` + `bb8` connection pool. Schema managed by embedded Diesel migrations in `crates/arbiter-server/migrations/`. DB file lives at `~/.arbiter/arbiter.sqlite`. Tests use a temp-file DB via `db::create_test_pool()`.
+
+**Cryptography:**
+- Authentication: ed25519 (challenge-response, nonce-tracked per peer)
+- Encryption at rest: XChaCha20-Poly1305 (versioned via `scheme` field for transparent migration on unseal)
+- Password KDF: Argon2
+- Unseal transport: X25519 ephemeral key exchange
+- TLS: self-signed certificate (aws-lc-rs backend), fingerprint distributed via `ArbiterUrl`
+
+**Protocol:** gRPC with Protocol Buffers. The `ArbiterUrl` type encodes host, port, CA cert, and bootstrap token into a single shareable string (printed to console on first run).
+
+### Proto Regeneration
+
+When `.proto` files in `protobufs/` change, rebuild to regenerate:
+```sh
+cd server && cargo build -p arbiter-proto
+```
+
+### Database Migrations
+
+```sh
+# Create a new migration
+diesel migration generate <name> --migration-dir crates/arbiter-server/migrations
+
+# Run migrations manually (server also runs them on startup)
+diesel migration run --migration-dir crates/arbiter-server/migrations
+```
+
+## User Agent (Flutter + Rinf at `useragent/`)
+
+The Flutter app uses [Rinf](https://rinf.cunarist.org) to call Rust code. The Rust logic lives in `useragent/native/hub/` as a separate crate that uses `arbiter-useragent` for the gRPC client.
+
+Communication between Dart and Rust uses typed **signals** defined in `useragent/native/hub/src/signals/`. After modifying signal structs, regenerate Dart bindings:
+
+```sh
+cd useragent && rinf gen
+```
+
+### Common Commands
+
+```sh
+cd useragent
+
+# Run the app (macOS or Windows)
+flutter run
+
+# Regenerate Rust↔Dart signal bindings
+rinf gen
+
+# Analyze Dart code
+flutter analyze
+```
+
+The Rinf Rust entry point is `useragent/native/hub/src/lib.rs`. It spawns actors defined in `useragent/native/hub/src/actors/` which handle Dart↔server communication via signals.

IMPLEMENTATION.md

@@ -4,6 +4,52 @@ This document covers concrete technology choices and dependencies. For the archi
 
 ---
 
+## Client Connection Flow
+
+### New Client Approval
+
+When a client whose public key is not yet in the database connects, all connected user agents are asked to approve the connection. The first agent to respond determines the outcome; remaining requests are cancelled via a watch channel.
+
+```mermaid
+flowchart TD
+    A([Client connects]) --> B[Receive AuthChallengeRequest]
+    B --> C{pubkey in DB?}
+
+    C -- yes --> D[Read nonce\nIncrement nonce in DB]
+    D --> G
+
+    C -- no --> E[Ask all UserAgents:\nClientConnectionRequest]
+    E --> F{First response}
+    F -- denied --> Z([Reject connection])
+    F -- approved --> F2[Cancel remaining\nUserAgent requests]
+    F2 --> F3[INSERT client\nnonce = 1]
+    F3 --> G[Send AuthChallenge\nwith nonce]
+
+    G --> H[Receive AuthChallengeSolution]
+    H --> I{Signature valid?}
+    I -- no --> Z
+    I -- yes --> J([Session started])
+```
+
+### Known Issue: Concurrent Registration Race (TOCTOU)
+
+Two connections presenting the same previously-unknown public key can race through the approval flow simultaneously:
+
+1. Both check the DB → neither is registered.
+2. Both request approval from user agents → both receive approval.
+3. Both `INSERT` the client record → the second insert silently overwrites the first, resetting the nonce.
+
+This means the first connection's nonce is invalidated by the second, causing its challenge verification to fail. A fix requires either serialising new-client registration (e.g. an in-memory lock keyed on pubkey) or replacing the separate check + insert with an `INSERT OR IGNORE` / upsert guarded by a unique constraint on `public_key`.
+
+### Nonce Semantics
+
+The `program_client.nonce` column stores the **next usable nonce** — i.e. it is always one ahead of the nonce last issued in a challenge.
+
+- **New client:** inserted with `nonce = 1`; the first challenge is issued with `nonce = 0`.
+- **Existing client:** the current DB value is read and used as the challenge nonce, then immediately incremented within the same exclusive transaction, preventing replay.
+
+---
+
 ## Cryptography
 
 ### Authentication

mise.lock

@@ -1,3 +1,12 @@
+[[tools.ast-grep]]
+version = "0.42.0"
+backend = "aqua:ast-grep/ast-grep"
+"platforms.linux-arm64" = { checksum = "sha256:5c830eae8456569e2f7212434ed9c238f58dca412d76045418ed6d394a755836", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-aarch64-unknown-linux-gnu.zip"}
+"platforms.linux-x64" = { checksum = "sha256:e825a05603f0bcc4cd9076c4cc8c9abd6d008b7cd07d9aa3cc323ba4b8606651", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-unknown-linux-gnu.zip"}
+"platforms.macos-arm64" = { checksum = "sha256:fc300d5293b1c770a5aece03a8a193b92e71e87cec726c28096990691a582620", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-aarch64-apple-darwin.zip"}
+"platforms.macos-x64" = { checksum = "sha256:979ffe611327056f4730a1ae71b0209b3b830f58b22c6ed194cda34f55400db2", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-apple-darwin.zip"}
+"platforms.windows-x64" = { checksum = "sha256:55836fa1b2c65dc7d61615a4d9368622a0d2371a76d28b9a165e5a3ab6ae32a4", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-pc-windows-msvc.zip"}
+
 [[tools."cargo:cargo-audit"]]
 version = "0.22.1"
 backend = "cargo:cargo-audit"
@@ -42,6 +51,10 @@ backend = "cargo:diesel_cli"
 default-features = "false"
 features = "sqlite,sqlite-bundled"
 
+[[tools."cargo:rinf_cli"]]
+version = "8.9.1"
+backend = "cargo:rinf_cli"
+
 [[tools.flutter]]
 version = "3.38.9-stable"
 backend = "asdf:flutter"

mise.toml

@@ -10,3 +10,12 @@ protoc = "29.6"
 "cargo:cargo-shear" = "latest"
 "cargo:cargo-insta" = "1.46.3"
 python = "3.14.3"
+ast-grep = "0.42.0"
+
+[tasks.codegen]
+sources = ['protobufs/*.proto']
+outputs = ['useragent/lib/proto/*']
+run = '''
+dart pub global activate protoc_plugin && \
+protoc --dart_out=grpc:useragent/lib/proto --proto_path=protobufs/ protobufs/*.proto
+'''

protobufs/client.proto

@@ -23,15 +23,23 @@ message ClientRequest {
   oneof payload {
     AuthChallengeRequest auth_challenge_request = 1;
     AuthChallengeSolution auth_challenge_solution = 2;
-    arbiter.evm.EvmSignTransactionRequest evm_sign_transaction = 3;
-    arbiter.evm.EvmAnalyzeTransactionRequest evm_analyze_transaction = 4;
   }
 }
 
+message ClientConnectError {
+  enum Code {
+    UNKNOWN = 0;
+    APPROVAL_DENIED = 1;
+    NO_USER_AGENTS_ONLINE = 2;
+  }
+  Code code = 1;
+}
+
 message ClientResponse {
   oneof payload {
     AuthChallenge auth_challenge = 1;
     AuthOk auth_ok = 2;
+    ClientConnectError client_connect_error = 5;
     arbiter.evm.EvmSignTransactionResponse evm_sign_transaction = 3;
     arbiter.evm.EvmAnalyzeTransactionResponse evm_analyze_transaction = 4;
   }

protobufs/user_agent.proto

@@ -5,9 +5,17 @@ package arbiter.user_agent;
 import "google/protobuf/empty.proto";
 import "evm.proto";
 
+enum KeyType {
+  KEY_TYPE_UNSPECIFIED = 0;
+  KEY_TYPE_ED25519 = 1;
+  KEY_TYPE_ECDSA_SECP256K1 = 2;
+  KEY_TYPE_RSA = 3;
+}
+
 message AuthChallengeRequest {
   bytes pubkey = 1;
   optional string bootstrap_token = 2;
+  KeyType key_type = 3;
 }
 
 message AuthChallenge {
@@ -34,6 +42,12 @@ message UnsealEncryptedKey {
   bytes associated_data = 3;
 }
 
+message BootstrapEncryptedKey {
+  bytes nonce = 1;
+  bytes ciphertext = 2;
+  bytes associated_data = 3;
+}
+
 enum UnsealResult {
   UNSEAL_RESULT_UNSPECIFIED = 0;
   UNSEAL_RESULT_SUCCESS = 1;
@@ -41,6 +55,13 @@ enum UnsealResult {
   UNSEAL_RESULT_UNBOOTSTRAPPED = 3;
 }
 
+enum BootstrapResult {
+  BOOTSTRAP_RESULT_UNSPECIFIED = 0;
+  BOOTSTRAP_RESULT_SUCCESS = 1;
+  BOOTSTRAP_RESULT_ALREADY_BOOTSTRAPPED = 2;
+  BOOTSTRAP_RESULT_INVALID_KEY = 3;
+}
+
 enum VaultState {
   VAULT_STATE_UNSPECIFIED = 0;
   VAULT_STATE_UNBOOTSTRAPPED = 1;
@@ -49,6 +70,16 @@ enum VaultState {
   VAULT_STATE_ERROR = 4;
 }
 
+message ClientConnectionRequest {
+  bytes pubkey = 1;
+}
+
+message ClientConnectionResponse {
+  bool approved = 1;
+}
+
+message ClientConnectionCancel {}
+
 message UserAgentRequest {
   oneof payload {
     AuthChallengeRequest auth_challenge_request = 1;
@@ -61,6 +92,8 @@ message UserAgentRequest {
     arbiter.evm.EvmGrantCreateRequest evm_grant_create = 8;
     arbiter.evm.EvmGrantDeleteRequest evm_grant_delete = 9;
     arbiter.evm.EvmGrantListRequest evm_grant_list = 10;
+    ClientConnectionResponse client_connection_response = 11;
+    BootstrapEncryptedKey bootstrap_encrypted_key = 12;
   }
 }
 message UserAgentResponse {
@@ -75,5 +108,8 @@ message UserAgentResponse {
     arbiter.evm.EvmGrantCreateResponse evm_grant_create = 8;
     arbiter.evm.EvmGrantDeleteResponse evm_grant_delete = 9;
     arbiter.evm.EvmGrantListResponse evm_grant_list = 10;
+    ClientConnectionRequest client_connection_request = 11;
+    ClientConnectionCancel client_connection_cancel = 12;
+    BootstrapResult bootstrap_result = 13;
   }
 }

server/.cargo/audit.toml

@@ -0,0 +1,13 @@
+[advisories]
+# RUSTSEC-2023-0071: Marvin Attack timing side-channel in rsa crate.
+# No fixed version is available upstream.
+# RSA support is required for Windows Hello / KeyCredentialManager
+# (https://learn.microsoft.com/en-us/uwp/api/windows.security.credentials.keycredentialmanager.requestcreateasync),
+# which only issues RSA-2048 keys.
+# Mitigations in place:
+#   - Signing uses BlindedSigningKey (PSS+SHA-256), which applies blinding to
+#     protect the private key from timing recovery during signing.
+#   - RSA decryption is never performed; we only verify public-key signatures.
+#   - The attack requires local, high-resolution timing access against the
+#     signing process, which is not exposed in our threat model.
+ignore = ["RUSTSEC-2023-0071"]

server/Cargo.lock

@@ -654,7 +654,7 @@ version = "1.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fa0c53e8c1e1ef4d01066b01c737fb62fc9397ab52c6e7bb5669f97d281b9bc"
 dependencies = [
- "darling",
+ "darling 0.21.3",
  "proc-macro2",
  "quote",
  "syn 2.0.117",
@@ -727,12 +727,16 @@ dependencies = [
  "memsafe",
  "miette",
  "pem",
+ "prost-types",
  "rand 0.10.0",
  "rcgen",
  "restructed",
+ "rsa",
  "rustls",
  "secrecy",
+ "sha2 0.10.9",
  "smlang",
+ "spki",
  "strum",
  "test-log",
  "thiserror",
@@ -752,25 +756,6 @@ dependencies = [
  "alloy",
 ]
 
-[[package]]
-name = "arbiter-useragent"
-version = "0.1.0"
-dependencies = [
- "arbiter-proto",
- "async-trait",
- "ed25519-dalek",
- "http",
- "kameo",
- "rustls-webpki",
- "smlang",
- "thiserror",
- "tokio",
- "tokio-stream",
- "tonic",
- "tracing",
- "x25519-dalek",
-]
-
 [[package]]
 name = "argon2"
 version = "0.5.3"
@@ -1334,9 +1319,9 @@ dependencies = [
 
 [[package]]
 name = "c-kzg"
-version = "2.1.6"
+version = "2.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a0f582957c24870b7bfd12bf562c40b4734b533cafbaf8ded31d6d85f462c01"
+checksum = "6648ed1e4ea8e8a1a4a2c78e1cda29a3fd500bc622899c340d8525ea9a76b24a"
 dependencies = [
  "blst",
  "cc",
@@ -1349,9 +1334,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.2.56"
+version = "1.2.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aebf35691d1bfb0ac386a69bac2fde4dd276fb618cf8bf4f5318fe285e821bb2"
+checksum = "7a0dd1ca384932ff3641c8718a02769f1698e7563dc6974ffd03346116310423"
 dependencies = [
  "find-msvc-tools",
  "jobserver",
@@ -1615,7 +1600,7 @@ dependencies = [
  "cfg-if",
  "cpufeatures 0.2.17",
  "curve25519-dalek-derive",
- "digest 0.11.1",
+ "digest 0.11.2",
  "fiat-crypto 0.3.0",
  "rustc_version 0.4.1",
  "subtle",
@@ -1639,8 +1624,18 @@ version = "0.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9cdf337090841a411e2a7f3deb9187445851f91b309c0c0a29e05f74a00a48c0"
 dependencies = [
- "darling_core",
- "darling_macro",
+ "darling_core 0.21.3",
+ "darling_macro 0.21.3",
+]
+
+[[package]]
+name = "darling"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25ae13da2f202d56bd7f91c25fba009e7717a1e4a1cc98a76d844b65ae912e9d"
+dependencies = [
+ "darling_core 0.23.0",
+ "darling_macro 0.23.0",
 ]
 
 [[package]]
@@ -1658,13 +1653,37 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "darling_core"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9865a50f7c335f53564bb694ef660825eb8610e0a53d3e11bf1b0d3df31e03b0"
+dependencies = [
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "darling_macro"
 version = "0.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d38308df82d1080de0afee5d069fa14b0326a88c14f15c5ccda35b4a6c414c81"
 dependencies = [
- "darling_core",
+ "darling_core 0.21.3",
+ "quote",
+ "syn 2.0.117",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3984ec7bd6cfa798e62b4a642426a5be0e68f9401cfc2a01e3fa9ea2fcdb8d"
+dependencies = [
+ "darling_core 0.23.0",
  "quote",
  "syn 2.0.117",
 ]
@@ -1696,6 +1715,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e7c1832837b905bbfb5101e07cc24c8deddf52f93225eee6ead5f4d63d53ddcb"
 dependencies = [
  "const-oid",
+ "pem-rfc7468",
  "zeroize",
 ]
 
@@ -1759,9 +1779,9 @@ dependencies = [
 
 [[package]]
 name = "diesel"
-version = "2.3.6"
+version = "2.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b6c2fc184a6fb6ebcf5f9a5e3bbfa84d8fd268cdfcce4ed508979a6259494d"
+checksum = "f4ae09a41a4b89f94ec1e053623da8340d996bc32c6517d325a9daad9b239358"
 dependencies = [
  "chrono",
  "diesel_derives",
@@ -1844,9 +1864,9 @@ dependencies = [
 
 [[package]]
 name = "digest"
-version = "0.11.1"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "285743a676ccb6b3e116bc14cc69319b957867930ae9c4822f8e0f54509d7243"
+checksum = "4850db49bf08e663084f7fb5c87d202ef91a3907271aff24a94eb97ff039153c"
 dependencies = [
  "block-buffer 0.12.0",
  "crypto-common 0.2.1",
@@ -1875,7 +1895,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd122633e4bef06db27737f21d3738fb89c8f6d5360d6d9d7635dda142a7757e"
 dependencies = [
- "darling",
+ "darling 0.21.3",
  "either",
  "heck",
  "proc-macro2",
@@ -2876,6 +2896,9 @@ name = "lazy_static"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+dependencies = [
+ "spin",
+]
 
 [[package]]
 name = "leb128fmt"
@@ -2897,9 +2920,9 @@ checksum = "b6d2cec3eae94f9f509c767b45932f1ada8350c4bdb85af2fcab4a3c14807981"
 
 [[package]]
 name = "libsqlite3-sys"
-version = "0.35.0"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "133c182a6a2c87864fe97778797e46c7e999672690dc9fa3ee8e241aa4a9c13f"
+checksum = "95b4103cffefa72eb8428cb6b47d6627161e51c2739fc5e3b734584157bc642a"
 dependencies = [
  "pkg-config",
  "vcpkg",
@@ -3109,6 +3132,22 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-bigint-dig"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e661dda6640fad38e827a6d4a310ff4763082116fe217f279885c97f511bb0b7"
+dependencies = [
+ "lazy_static",
+ "libm",
+ "num-integer",
+ "num-iter",
+ "num-traits",
+ "rand 0.8.5",
+ "smallvec",
+ "zeroize",
+]
+
 [[package]]
 name = "num-conv"
 version = "0.2.0"
@@ -3124,6 +3163,17 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-iter"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1429034a0490724d0075ebb2bc9e875d6503c3cf69e235a8941aa757d83ef5bf"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -3199,9 +3249,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.21.3"
+version = "1.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
 
 [[package]]
 name = "opaque-debug"
@@ -3293,6 +3343,15 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "pem-rfc7468"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88b39c9bfcfc231068454382784bb460aae594343fb030d46e9f50a645418412"
+dependencies = [
+ "base64ct",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@@ -3352,6 +3411,17 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
+name = "pkcs1"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8ffb9f10fa047879315e6625af03c164b16962a5368d724ed16323b68ace47f"
+dependencies = [
+ "der",
+ "pkcs8",
+ "spki",
+]
+
 [[package]]
 name = "pkcs8"
 version = "0.10.2"
@@ -3935,6 +4005,27 @@ dependencies = [
  "rustc-hex",
 ]
 
+[[package]]
+name = "rsa"
+version = "0.9.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8573f03f5883dcaebdfcf4725caa1ecb9c15b2ef50c43a07b816e06799bb12d"
+dependencies = [
+ "const-oid",
+ "digest 0.10.7",
+ "num-bigint-dig",
+ "num-integer",
+ "num-traits",
+ "pkcs1",
+ "pkcs8",
+ "rand_core 0.6.4",
+ "sha2 0.10.9",
+ "signature 2.2.0",
+ "spki",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "rsqlite-vfs"
 version = "0.1.0"
@@ -4302,9 +4393,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.17.0"
+version = "3.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "381b283ce7bc6b476d903296fb59d0d36633652b633b27f64db4fb46dcbfc3b9"
+checksum = "dd5414fad8e6907dbdd5bc441a50ae8d6e26151a03b1de04d89a5576de61d01f"
 dependencies = [
  "base64",
  "chrono",
@@ -4321,11 +4412,11 @@ dependencies = [
 
 [[package]]
 name = "serde_with_macros"
-version = "3.17.0"
+version = "3.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6d4e30573c8cb306ed6ab1dca8423eec9a463ea0e155f45399455e0368b27e0"
+checksum = "d3db8978e608f1fe7357e211969fd9abdcae80bac1ba7a3369bb7eb6b404eb65"
 dependencies = [
- "darling",
+ "darling 0.23.0",
  "proc-macro2",
  "quote",
  "syn 2.0.117",
@@ -4360,7 +4451,7 @@ checksum = "7c5f3b1e2dc8aad28310d8410bd4d7e180eca65fca176c52ab00d364475d0024"
 dependencies = [
  "cfg-if",
  "cpufeatures 0.2.17",
- "digest 0.11.1",
+ "digest 0.11.2",
 ]
 
 [[package]]
@@ -4482,6 +4573,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+
 [[package]]
 name = "spki"
 version = "0.7.3"
@@ -4771,9 +4868,9 @@ dependencies = [
 
 [[package]]
 name = "tinyvec"
-version = "1.10.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfa5fdc3bce6191a1dbc8c02d5c8bffcf557bafa17c124c5264a458f1b0613fa"
+checksum = "3e61e67053d25a4e82c844e8424039d9745781b3fc4f32b8d55ed50f5f667ef3"
 dependencies = [
  "tinyvec_macros",
 ]
@@ -5065,9 +5162,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.3.22"
+version = "0.3.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f30143827ddab0d256fd843b7a66d164e9f271cfa0dde49142c5ca0ca291f1e"
+checksum = "cb7f578e5945fb242538965c2d0b04418d38ec25c79d160cd279bf0731c8d319"
 dependencies = [
  "matchers",
  "nu-ansi-term",

server/Cargo.toml

@@ -4,6 +4,9 @@ members = [
 ]
 resolver = "3"
 
+[workspace.lints.clippy]
+disallowed-methods = "deny"
+
 
 [workspace.dependencies]
 tonic = { version = "0.14.3", features = [
@@ -17,7 +20,7 @@ tokio = { version = "1.49.0", features = ["full"] }
 ed25519-dalek = { version = "3.0.0-pre.6", features = ["rand_core"] }
 chrono = { version = "0.4.43", features = ["serde"] }
 rand = "0.10.0"
-rustls = "0.23.36"
+rustls = { version = "0.23.36", features = ["aws-lc-rs"] }
 smlang = "0.8.0"
 miette = { version = "7.6.0", features = ["fancy", "serde"] }
 thiserror = "2.0.18"
@@ -36,3 +39,7 @@ rcgen = { version = "0.14.7", features = [
     "x509-parser",
     "zeroize",
 ], default-features = false }
+k256 = { version = "0.13.4", features = ["ecdsa", "pkcs8"] }
+rsa = { version = "0.9", features = ["sha2"] }
+sha2 = "0.10"
+spki = "0.7"

server/clippy.toml

@@ -0,0 +1,9 @@
+disallowed-methods = [
+    # RSA decryption is forbidden: the rsa crate has RUSTSEC-2023-0071 (Marvin Attack).
+    # We only use RSA for Windows Hello (KeyCredentialManager) public-key verification — decryption
+    # is never required and must not be introduced.
+    { path = "rsa::RsaPrivateKey::decrypt", reason = "RSA decryption is forbidden (RUSTSEC-2023-0071 Marvin Attack). Only PSS signing/verification is permitted." },
+    { path = "rsa::RsaPrivateKey::decrypt_blinded", reason = "RSA decryption is forbidden (RUSTSEC-2023-0071 Marvin Attack). Only PSS signing/verification is permitted." },
+    { path = "rsa::traits::Decryptor::decrypt", reason = "RSA decryption is forbidden (RUSTSEC-2023-0071 Marvin Attack). This blocks decrypt() on rsa::{pkcs1v15,oaep}::DecryptingKey." },
+    { path = "rsa::traits::RandomizedDecryptor::decrypt_with_rng", reason = "RSA decryption is forbidden (RUSTSEC-2023-0071 Marvin Attack). This blocks decrypt_with_rng() on rsa::{pkcs1v15,oaep}::DecryptingKey." },
+]

server/crates/arbiter-proto/build.rs

@@ -3,7 +3,6 @@ use tonic_prost_build::configure;
 static PROTOBUF_DIR: &str = "../../../protobufs";
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-
     println!("cargo::rerun-if-changed={PROTOBUF_DIR}");
 
     configure()
@@ -17,7 +16,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             ],
             &[PROTOBUF_DIR.to_string()],
         )
-        
         .unwrap();
     Ok(())
 }

server/crates/arbiter-proto/src/transport.rs

@@ -1,78 +1,39 @@
-//! Transport-facing abstractions for protocol/session code.
+//! Transport-facing abstractions shared by protocol/session code.
 //!
-//! This module separates three concerns:
-//!
-//! - protocol/session logic wants a small duplex interface ([`Bi`])
-//! - transport adapters push concrete stream items to an underlying IO layer
-//! - transport boundaries translate between protocol-facing and transport-facing
-//!   item types via direction-specific converters
+//! This module defines a small duplex interface, [`Bi`], that actors and other
+//! protocol code can depend on without knowing anything about the concrete
+//! transport underneath.
 //!
 //! [`Bi`] is intentionally minimal and transport-agnostic:
-//! - [`Bi::recv`] yields inbound protocol messages
-//! - [`Bi::send`] accepts outbound protocol/domain items
+//! - [`Bi::recv`] yields inbound messages
+//! - [`Bi::send`] accepts outbound messages
+//!
+//! Transport-specific adapters, including protobuf or gRPC bridges, live in the
+//! crates that own those boundaries rather than in `arbiter-proto`.
 //!
 //! # Generic Ordering Rule
 //!
-//! This module uses a single convention consistently: when a type or trait is
-//! parameterized by protocol message directions, the generic parameters are
-//! declared as `Inbound` first, then `Outbound`.
+//! This module consistently uses `Inbound` first and `Outbound` second in
+//! generic parameter lists.
 //!
 //! For [`Bi`], that means `Bi<Inbound, Outbound>`:
 //! - `recv() -> Option<Inbound>`
 //! - `send(Outbound)`
 //!
-//! For adapter types that are parameterized by direction-specific converters,
-//! inbound-related converter parameters are declared before outbound-related
-//! converter parameters.
+//! [`expect_message`] is a small helper for request/response style flows: it
+//! reads one inbound message from a transport and extracts a typed value from
+//! it, failing if the channel closes or the message shape is not what the
+//! caller expected.
 //!
-//! [`RecvConverter`] and [`SendConverter`] are infallible conversion traits used
-//! by adapters to map between protocol-facing and transport-facing item types.
-//! The traits themselves are not result-aware; adapters decide how transport
-//! errors are handled before (or instead of) conversion.
-//!
-//! [`grpc::GrpcAdapter`] combines:
-//! - a tonic inbound stream
-//! - a Tokio sender for outbound transport items
-//! - a [`RecvConverter`] for the receive path
-//! - a [`SendConverter`] for the send path
-//!
-//! [`DummyTransport`] is a no-op implementation useful for tests and local actor
-//! execution where no real network stream exists.
-//!
-//! # Component Interaction
-//!
-//! ```text
-//! inbound (network -> protocol)
-//! ============================
-//!
-//! tonic::Streaming<RecvTransport>
-//!     -> grpc::GrpcAdapter::recv()
-//!          |
-//!          +--> on `Ok(item)`: RecvConverter::convert(RecvTransport) -> Inbound
-//!          +--> on `Err(status)`: log error and close stream (`None`)
-//!     -> Bi::recv()
-//!     -> protocol/session actor
-//!
-//! outbound (protocol -> network)
-//! ==============================
-//!
-//! protocol/session actor
-//!     -> Bi::send(Outbound)
-//!     -> grpc::GrpcAdapter::send()
-//!          |
-//!          +--> SendConverter::convert(Outbound) -> SendTransport
-//!     -> Tokio mpsc::Sender<SendTransport>
-//!     -> tonic response stream
-//! ```
+//! [`DummyTransport`] is a no-op implementation useful for tests and local
+//! actor execution where no real stream exists.
 //!
 //! # Design Notes
 //!
-//! - `send()` returns [`Error`] only for transport delivery failures (for
-//!   example, when the outbound channel is closed).
-//! - [`grpc::GrpcAdapter`] logs tonic receive errors and treats them as stream
-//!   closure (`None`).
-//! - When protocol-facing and transport-facing types are identical, use
-//!   [`IdentityRecvConverter`] / [`IdentitySendConverter`].
+//! - [`Bi::send`] returns [`Error`] only for transport delivery failures, such
+//!   as a closed outbound channel.
+//! - [`Bi::recv`] returns `None` when the underlying transport closes.
+//! - Message translation is intentionally out of scope for this module.
 
 use std::marker::PhantomData;
 
@@ -83,6 +44,23 @@ use async_trait::async_trait;
 pub enum Error {
     #[error("Transport channel is closed")]
     ChannelClosed,
+    #[error("Unexpected message received")]
+    UnexpectedMessage,
+}
+
+/// Receives one message from `transport` and extracts a value from it using
+/// `extractor`. Returns [`Error::ChannelClosed`] if the transport closes and
+/// [`Error::UnexpectedMessage`] if `extractor` returns `None`.
+pub async fn expect_message<T, Inbound, Outbound, Target, F>(
+    transport: &mut T,
+    extractor: F,
+) -> Result<Target, Error>
+where
+    T: Bi<Inbound, Outbound> + ?Sized,
+    F: FnOnce(Inbound) -> Option<Target>,
+{
+    let msg = transport.recv().await.ok_or(Error::ChannelClosed)?;
+    extractor(msg).ok_or(Error::UnexpectedMessage)
 }
 
 /// Minimal bidirectional transport abstraction used by protocol code.
@@ -97,163 +75,6 @@ pub trait Bi<Inbound, Outbound>: Send + Sync + 'static {
     async fn recv(&mut self) -> Option<Inbound>;
 }
 
-/// Converts transport-facing inbound items into protocol-facing inbound items.
-pub trait RecvConverter: Send + Sync + 'static {
-    type Input;
-    type Output;
-
-    fn convert(&self, item: Self::Input) -> Self::Output;
-}
-
-/// Converts protocol/domain outbound items into transport-facing outbound items.
-pub trait SendConverter: Send + Sync + 'static {
-    type Input;
-    type Output;
-
-    fn convert(&self, item: Self::Input) -> Self::Output;
-}
-
-/// A [`RecvConverter`] that forwards values unchanged.
-pub struct IdentityRecvConverter<T> {
-    _marker: PhantomData<T>,
-}
-
-impl<T> IdentityRecvConverter<T> {
-    pub fn new() -> Self {
-        Self {
-            _marker: PhantomData,
-        }
-    }
-}
-
-impl<T> Default for IdentityRecvConverter<T> {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-impl<T> RecvConverter for IdentityRecvConverter<T>
-where
-    T: Send + Sync + 'static,
-{
-    type Input = T;
-    type Output = T;
-
-    fn convert(&self, item: Self::Input) -> Self::Output {
-        item
-    }
-}
-
-/// A [`SendConverter`] that forwards values unchanged.
-pub struct IdentitySendConverter<T> {
-    _marker: PhantomData<T>,
-}
-
-impl<T> IdentitySendConverter<T> {
-    pub fn new() -> Self {
-        Self {
-            _marker: PhantomData,
-        }
-    }
-}
-
-impl<T> Default for IdentitySendConverter<T> {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-impl<T> SendConverter for IdentitySendConverter<T>
-where
-    T: Send + Sync + 'static,
-{
-    type Input = T;
-    type Output = T;
-
-    fn convert(&self, item: Self::Input) -> Self::Output {
-        item
-    }
-}
-
-/// gRPC-specific transport adapters and helpers.
-pub mod grpc {
-    use async_trait::async_trait;
-    use futures::StreamExt;
-    use tokio::sync::mpsc;
-    use tonic::Streaming;
-
-    use super::{Bi, Error, RecvConverter, SendConverter};
-
-    /// [`Bi`] adapter backed by a tonic gRPC bidirectional stream.
-    ///
-
-    /// Tonic receive errors are logged and treated as stream closure (`None`).
-    /// The receive converter is only invoked for successful inbound transport
-    /// items.
-    pub struct GrpcAdapter<InboundConverter, OutboundConverter>
-    where
-        InboundConverter: RecvConverter,
-        OutboundConverter: SendConverter,
-    {
-        sender: mpsc::Sender<OutboundConverter::Output>,
-        receiver: Streaming<InboundConverter::Input>,
-        inbound_converter: InboundConverter,
-        outbound_converter: OutboundConverter,
-    }
-
-    impl<InboundTransport, Inbound, InboundConverter, OutboundConverter>
-        GrpcAdapter<InboundConverter, OutboundConverter>
-    where
-        InboundConverter: RecvConverter<Input = InboundTransport, Output = Inbound>,
-        OutboundConverter: SendConverter,
-    {
-        pub fn new(
-            sender: mpsc::Sender<OutboundConverter::Output>,
-            receiver: Streaming<InboundTransport>,
-            inbound_converter: InboundConverter,
-            outbound_converter: OutboundConverter,
-        ) -> Self {
-            Self {
-                sender,
-                receiver,
-                inbound_converter,
-                outbound_converter,
-            }
-        }
-    }
-
-    #[async_trait]
-    impl<InboundConverter, OutboundConverter> Bi<InboundConverter::Output, OutboundConverter::Input>
-        for GrpcAdapter<InboundConverter, OutboundConverter>
-    where
-        InboundConverter: RecvConverter,
-        OutboundConverter: SendConverter,
-        OutboundConverter::Input: Send + 'static,
-        OutboundConverter::Output: Send + 'static,
-    {
-        #[tracing::instrument(level = "trace", skip(self, item))]
-        async fn send(&mut self, item: OutboundConverter::Input) -> Result<(), Error> {
-            let outbound = self.outbound_converter.convert(item);
-            self.sender
-                .send(outbound)
-                .await
-                .map_err(|_| Error::ChannelClosed)
-        }
-
-        #[tracing::instrument(level = "trace", skip(self))]
-        async fn recv(&mut self) -> Option<InboundConverter::Output> {
-            match self.receiver.next().await {
-                Some(Ok(item)) => Some(self.inbound_converter.convert(item)),
-                Some(Err(error)) => {
-                    tracing::error!(error = ?error, "grpc transport recv failed; closing stream");
-                    None
-                }
-                None => None,
-            }
-        }
-    }
-}
-
 /// No-op [`Bi`] transport for tests and manual actor usage.
 ///
 /// `send` drops all items and succeeds. [`Bi::recv`] never resolves and therefore

server/crates/arbiter-proto/src/url.rs

@@ -20,7 +20,7 @@ impl Display for ArbiterUrl {
             "{ARBITER_URL_SCHEME}://{}:{}?{CERT_QUERY_KEY}={}",
             self.host,
             self.port,
-            BASE64_URL_SAFE.encode(self.ca_cert.to_vec())
+            BASE64_URL_SAFE.encode(&self.ca_cert)
         );
         if let Some(token) = &self.bootstrap_token {
             base.push_str(&format!("&{BOOTSTRAP_TOKEN_QUERY_KEY}={}", token));

server/crates/arbiter-server/Cargo.toml

@@ -5,6 +5,9 @@ edition = "2024"
 repository = "https://git.markettakers.org/MarketTakers/arbiter"
 license = "Apache-2.0"
 
+[lints]
+workspace = true
+
 [dependencies]
 diesel = { version = "2.3.6", features = ["chrono", "returning_clauses_for_sqlite_3_35", "serde_json", "time", "uuid"] }
 diesel-async = { version = "0.7.4", features = [
@@ -42,8 +45,12 @@ argon2 = { version = "0.5.3", features = ["zeroize"] }
 restructed = "0.2.2"
 strum = { version = "0.27.2", features = ["derive"] }
 pem = "3.0.6"
-k256 = "0.13.4"
+k256.workspace = true
+rsa.workspace = true
+sha2.workspace = true
+spki.workspace = true
 alloy.workspace = true
+prost-types.workspace = true
 arbiter-tokens-registry.path = "../arbiter-tokens-registry"
 
 [dev-dependencies]

server/crates/arbiter-server/migrations/2026-02-14-171124-0000_init/up.sql

@@ -46,6 +46,7 @@ create table if not exists useragent_client (
     id integer not null primary key,
     nonce integer not null default(1), -- used for auth challenge
     public_key blob not null,
+    key_type integer not null default(1), -- 1=Ed25519, 2=ECDSA(secp256k1)
     created_at integer not null default(unixepoch ('now')),
     updated_at integer not null default(unixepoch ('now'))
 ) STRICT;

server/crates/arbiter-server/src/actors/bootstrap.rs

@@ -3,12 +3,7 @@ use diesel::QueryDsl;
 use diesel_async::RunQueryDsl;
 use kameo::{Actor, messages};
 use miette::Diagnostic;
-use rand::{
-    RngExt,
-    distr::{Alphanumeric},
-    make_rng,
-    rngs::StdRng,
-};
+use rand::{RngExt, distr::Alphanumeric, make_rng, rngs::StdRng};
 use thiserror::Error;
 
 use crate::db::{self, DatabasePool, schema};
@@ -61,7 +56,6 @@ impl Bootstrapper {
 
         drop(conn);
 
-
         let token = if row_count == 0 {
             let token = generate_token().await?;
             Some(token)

server/crates/arbiter-server/src/actors/client/auth.rs

@@ -0,0 +1,237 @@
+use arbiter_proto::{format_challenge, transport::expect_message};
+use diesel::{
+    ExpressionMethods as _, OptionalExtension as _, QueryDsl as _, dsl::insert_into, update,
+};
+use diesel_async::RunQueryDsl as _;
+use ed25519_dalek::VerifyingKey;
+use kameo::error::SendError;
+use tracing::error;
+
+use crate::{
+    actors::{
+        client::{ClientConnection, ConnectErrorCode, Request, Response},
+        router::{self, RequestClientApproval},
+    },
+    db::{self, schema::program_client},
+};
+
+use super::session::ClientSession;
+
+#[derive(thiserror::Error, Debug, Clone, PartialEq, Eq)]
+pub enum Error {
+    #[error("Unexpected message payload")]
+    UnexpectedMessagePayload,
+    #[error("Invalid client public key length")]
+    InvalidClientPubkeyLength,
+    #[error("Invalid client public key encoding")]
+    InvalidAuthPubkeyEncoding,
+    #[error("Database pool unavailable")]
+    DatabasePoolUnavailable,
+    #[error("Database operation failed")]
+    DatabaseOperationFailed,
+    #[error("Invalid challenge solution")]
+    InvalidChallengeSolution,
+    #[error("Client approval request failed")]
+    ApproveError(#[from] ApproveError),
+    #[error("Internal error")]
+    InternalError,
+    #[error("Transport error")]
+    Transport,
+}
+
+#[derive(thiserror::Error, Debug, Clone, PartialEq, Eq)]
+pub enum ApproveError {
+    #[error("Internal error")]
+    Internal,
+    #[error("Client connection denied by user agents")]
+    Denied,
+    #[error("Upstream error: {0}")]
+    Upstream(router::ApprovalError),
+}
+
+/// Atomically reads and increments the nonce for a known client.
+/// Returns `None` if the pubkey is not registered.
+async fn get_nonce(db: &db::DatabasePool, pubkey: &VerifyingKey) -> Result<Option<i32>, Error> {
+    let pubkey_bytes = pubkey.as_bytes().to_vec();
+
+    let mut conn = db.get().await.map_err(|e| {
+        error!(error = ?e, "Database pool error");
+        Error::DatabasePoolUnavailable
+    })?;
+
+    conn.exclusive_transaction(|conn| {
+        let pubkey_bytes = pubkey_bytes.clone();
+        Box::pin(async move {
+            let Some(current_nonce) = program_client::table
+                .filter(program_client::public_key.eq(&pubkey_bytes))
+                .select(program_client::nonce)
+                .first::<i32>(conn)
+                .await
+                .optional()?
+            else {
+                return Result::<_, diesel::result::Error>::Ok(None);
+            };
+
+            update(program_client::table)
+                .filter(program_client::public_key.eq(&pubkey_bytes))
+                .set(program_client::nonce.eq(current_nonce + 1))
+                .execute(conn)
+                .await?;
+
+            Ok(Some(current_nonce))
+        })
+    })
+    .await
+    .map_err(|e| {
+        error!(error = ?e, "Database error");
+        Error::DatabaseOperationFailed
+    })
+}
+
+async fn approve_new_client(
+    actors: &crate::actors::GlobalActors,
+    pubkey: VerifyingKey,
+) -> Result<(), Error> {
+    let result = actors
+        .router
+        .ask(RequestClientApproval {
+            client_pubkey: pubkey,
+        })
+        .await;
+
+    match result {
+        Ok(true) => Ok(()),
+        Ok(false) => Err(Error::ApproveError(ApproveError::Denied)),
+        Err(SendError::HandlerError(e)) => {
+            error!(error = ?e, "Approval upstream error");
+            Err(Error::ApproveError(ApproveError::Upstream(e)))
+        }
+        Err(e) => {
+            error!(error = ?e, "Approval request to router failed");
+            Err(Error::ApproveError(ApproveError::Internal))
+        }
+    }
+}
+
+async fn insert_client(db: &db::DatabasePool, pubkey: &VerifyingKey) -> Result<(), Error> {
+    let now = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs() as i32;
+
+    let mut conn = db.get().await.map_err(|e| {
+        error!(error = ?e, "Database pool error");
+        Error::DatabasePoolUnavailable
+    })?;
+
+    insert_into(program_client::table)
+        .values((
+            program_client::public_key.eq(pubkey.as_bytes().to_vec()),
+            program_client::nonce.eq(1), // pre-incremented; challenge uses 0
+            program_client::created_at.eq(now),
+            program_client::updated_at.eq(now),
+        ))
+        .execute(&mut conn)
+        .await
+        .map_err(|e| {
+            error!(error = ?e, "Failed to insert new client");
+            Error::DatabaseOperationFailed
+        })?;
+
+    Ok(())
+}
+
+async fn challenge_client(
+    props: &mut ClientConnection,
+    pubkey: VerifyingKey,
+    nonce: i32,
+) -> Result<(), Error> {
+    let challenge_pubkey = pubkey.as_bytes().to_vec();
+
+    props
+        .transport
+        .send(Ok(Response::AuthChallenge {
+            pubkey: challenge_pubkey.clone(),
+            nonce,
+        }))
+        .await
+        .map_err(|e| {
+            error!(error = ?e, "Failed to send auth challenge");
+            Error::Transport
+        })?;
+
+    let signature = expect_message(&mut *props.transport, |req: Request| match req {
+        Request::AuthChallengeSolution { signature } => Some(signature),
+        _ => None,
+    })
+    .await
+    .map_err(|e| {
+        error!(error = ?e, "Failed to receive challenge solution");
+        Error::Transport
+    })?;
+
+    let formatted = format_challenge(nonce, &challenge_pubkey);
+    let sig = signature.as_slice().try_into().map_err(|_| {
+        error!("Invalid signature length");
+        Error::InvalidChallengeSolution
+    })?;
+
+    pubkey.verify_strict(&formatted, &sig).map_err(|_| {
+        error!("Challenge solution verification failed");
+        Error::InvalidChallengeSolution
+    })?;
+
+    Ok(())
+}
+
+fn connect_error_code(err: &Error) -> ConnectErrorCode {
+    match err {
+        Error::ApproveError(ApproveError::Denied) => ConnectErrorCode::ApprovalDenied,
+        Error::ApproveError(ApproveError::Upstream(
+            router::ApprovalError::NoUserAgentsConnected,
+        )) => ConnectErrorCode::NoUserAgentsOnline,
+        _ => ConnectErrorCode::Unknown,
+    }
+}
+
+async fn authenticate(props: &mut ClientConnection) -> Result<VerifyingKey, Error> {
+    let Some(Request::AuthChallengeRequest {
+        pubkey: challenge_pubkey,
+    }) = props.transport.recv().await
+    else {
+        return Err(Error::Transport);
+    };
+
+    let pubkey_bytes = challenge_pubkey
+        .as_array()
+        .ok_or(Error::InvalidClientPubkeyLength)?;
+    let pubkey =
+        VerifyingKey::from_bytes(pubkey_bytes).map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
+
+    let nonce = match get_nonce(&props.db, &pubkey).await? {
+        Some(nonce) => nonce,
+        None => {
+            approve_new_client(&props.actors, pubkey).await?;
+            insert_client(&props.db, &pubkey).await?;
+            0
+        }
+    };
+
+    challenge_client(props, pubkey, nonce).await?;
+
+    Ok(pubkey)
+}
+
+pub async fn authenticate_and_create(mut props: ClientConnection) -> Result<ClientSession, Error> {
+    match authenticate(&mut props).await {
+        Ok(_pubkey) => Ok(ClientSession::new(props)),
+        Err(err) => {
+            let code = connect_error_code(&err);
+            let _ = props
+                .transport
+                .send(Ok(Response::ClientConnectError { code }))
+                .await;
+            Err(err)
+        }
+    }
+}

server/crates/arbiter-server/src/actors/client/auth/mod.rs

@@ -1,102 +0,0 @@
-use arbiter_proto::proto::client::{
-    AuthChallengeRequest, AuthChallengeSolution, ClientRequest,
-    client_request::Payload as ClientRequestPayload,
-};
-use ed25519_dalek::VerifyingKey;
-use tracing::error;
-
-use crate::actors::client::{
-    ClientConnection,
-    auth::state::{AuthContext, AuthStateMachine},
-    session::ClientSession,
-};
-
-#[derive(thiserror::Error, Debug, Clone, PartialEq, Eq)]
-pub enum Error {
-    #[error("Unexpected message payload")]
-    UnexpectedMessagePayload,
-    #[error("Invalid client public key length")]
-    InvalidClientPubkeyLength,
-    #[error("Invalid client public key encoding")]
-    InvalidAuthPubkeyEncoding,
-    #[error("Database pool unavailable")]
-    DatabasePoolUnavailable,
-    #[error("Database operation failed")]
-    DatabaseOperationFailed,
-    #[error("Public key not registered")]
-    PublicKeyNotRegistered,
-    #[error("Invalid signature length")]
-    InvalidSignatureLength,
-    #[error("Invalid challenge solution")]
-    InvalidChallengeSolution,
-    #[error("Transport error")]
-    Transport,
-}
-
-mod state;
-use state::*;
-
-fn parse_auth_event(payload: ClientRequestPayload) -> Result<AuthEvents, Error> {
-    match payload {
-        ClientRequestPayload::AuthChallengeRequest(AuthChallengeRequest { pubkey }) => {
-            let pubkey_bytes = pubkey.as_array().ok_or(Error::InvalidClientPubkeyLength)?;
-            let pubkey = VerifyingKey::from_bytes(pubkey_bytes)
-                .map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
-            Ok(AuthEvents::AuthRequest(ChallengeRequest {
-                pubkey: pubkey.into(),
-            }))
-        }
-        ClientRequestPayload::AuthChallengeSolution(AuthChallengeSolution { signature }) => {
-            Ok(AuthEvents::ReceivedSolution(ChallengeSolution {
-                solution: signature,
-            }))
-        }
-        _ => Err(Error::UnexpectedMessagePayload) ,
-    }
-}
-
-pub async fn authenticate(props: &mut ClientConnection) -> Result<VerifyingKey, Error> {
-    let mut state = AuthStateMachine::new(AuthContext::new(props));
-
-    loop {
-        let transport = state.context_mut().conn.transport.as_mut();
-        let Some(ClientRequest {
-            payload: Some(payload),
-        }) = transport.recv().await
-        else {
-            return Err(Error::Transport);
-        };
-
-        let event = parse_auth_event(payload)?;
-
-        match state.process_event(event).await {
-            Ok(AuthStates::AuthOk(key)) => return Ok(key.clone()),
-            Err(AuthError::ActionFailed(err)) => {
-                error!(?err, "State machine action failed");
-                return Err(err);
-            }
-            Err(AuthError::GuardFailed(err)) => {
-                error!(?err, "State machine guard failed");
-                return Err(err);
-            }
-            Err(AuthError::InvalidEvent) => {
-                error!("Invalid event for current state");
-                return Err(Error::InvalidChallengeSolution);
-            }
-            Err(AuthError::TransitionsFailed) => {
-                error!("Invalid state transition");
-                return Err(Error::InvalidChallengeSolution);
-            }
-
-            _ => (),
-        }
-    }
-}
-
-pub async fn authenticate_and_create(
-    mut props: ClientConnection,
-) -> Result<ClientSession, Error> {
-    let key = authenticate(&mut props).await?;
-    let session = ClientSession::new(props, key);
-    Ok(session)
-}

server/crates/arbiter-server/src/actors/client/auth/state.rs

@@ -1,136 +0,0 @@
-use arbiter_proto::proto::client::{
-    AuthChallenge, ClientResponse,
-    client_response::Payload as ClientResponsePayload,
-};
-use diesel::{ExpressionMethods as _, OptionalExtension as _, QueryDsl, update};
-use diesel_async::RunQueryDsl;
-use ed25519_dalek::VerifyingKey;
-use tracing::error;
-
-use super::Error;
-use crate::{actors::client::ClientConnection, db::schema};
-
-pub struct ChallengeRequest {
-    pub pubkey: VerifyingKey,
-}
-
-pub struct ChallengeContext {
-    pub challenge: AuthChallenge,
-    pub key: VerifyingKey,
-}
-
-pub struct ChallengeSolution {
-    pub solution: Vec<u8>,
-}
-
-smlang::statemachine!(
-    name: Auth,
-    custom_error: true,
-    transitions: {
-        *Init + AuthRequest(ChallengeRequest) / async prepare_challenge = SentChallenge(ChallengeContext),
-        SentChallenge(ChallengeContext) + ReceivedSolution(ChallengeSolution) [async verify_solution] / provide_key = AuthOk(VerifyingKey),
-    }
-);
-
-async fn create_nonce(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Result<i32, Error> {
-    let mut db_conn = db.get().await.map_err(|e| {
-        error!(error = ?e, "Database pool error");
-        Error::DatabasePoolUnavailable
-    })?;
-    db_conn
-        .exclusive_transaction(|conn| {
-            Box::pin(async move {
-                let current_nonce = schema::program_client::table
-                    .filter(schema::program_client::public_key.eq(pubkey_bytes.to_vec()))
-                    .select(schema::program_client::nonce)
-                    .first::<i32>(conn)
-                    .await?;
-
-                update(schema::program_client::table)
-                    .filter(schema::program_client::public_key.eq(pubkey_bytes.to_vec()))
-                    .set(schema::program_client::nonce.eq(current_nonce + 1))
-                    .execute(conn)
-                    .await?;
-
-                Result::<_, diesel::result::Error>::Ok(current_nonce)
-            })
-        })
-        .await
-        .optional()
-        .map_err(|e| {
-            error!(error = ?e, "Database error");
-            Error::DatabaseOperationFailed
-        })?
-        .ok_or_else(|| {
-            error!(?pubkey_bytes, "Public key not found in database");
-            Error::PublicKeyNotRegistered
-        })
-}
-
-pub struct AuthContext<'a> {
-    pub(super) conn: &'a mut ClientConnection,
-}
-
-impl<'a> AuthContext<'a> {
-    pub fn new(conn: &'a mut ClientConnection) -> Self {
-        Self { conn }
-    }
-}
-
-impl AuthStateMachineContext for AuthContext<'_> {
-    type Error = Error;
-
-    async fn verify_solution(
-        &self,
-        ChallengeContext { challenge, key }: &ChallengeContext,
-        ChallengeSolution { solution }: &ChallengeSolution,
-    ) -> Result<bool, Self::Error> {
-        let formatted_challenge =
-            arbiter_proto::format_challenge(challenge.nonce, &challenge.pubkey);
-
-        let signature = solution.as_slice().try_into().map_err(|_| {
-            error!(?solution, "Invalid signature length");
-            Error::InvalidChallengeSolution
-        })?;
-
-        let valid = key.verify_strict(&formatted_challenge, &signature).is_ok();
-
-        Ok(valid)
-    }
-
-    async fn prepare_challenge(
-        &mut self,
-        ChallengeRequest { pubkey }: ChallengeRequest,
-    ) -> Result<ChallengeContext, Self::Error> {
-        let nonce = create_nonce(&self.conn.db, pubkey.as_bytes()).await?;
-
-        let challenge = AuthChallenge {
-            pubkey: pubkey.as_bytes().to_vec(),
-            nonce,
-        };
-
-        self.conn
-            .transport
-            .send(Ok(ClientResponse {
-                payload: Some(ClientResponsePayload::AuthChallenge(challenge.clone())),
-            }))
-            .await
-            .map_err(|e| {
-                error!(?e, "Failed to send auth challenge");
-                Error::Transport
-            })?;
-
-        Ok(ChallengeContext {
-            challenge,
-            key: pubkey,
-        })
-    }
-
-    fn provide_key(
-        &mut self,
-        state_data: &ChallengeContext,
-        _: ChallengeSolution,
-    ) -> Result<VerifyingKey, Self::Error> {
-        Ok(state_data.key)
-    }
-}

server/crates/arbiter-server/src/actors/client/mod.rs

@@ -1,7 +1,4 @@
-use arbiter_proto::{
-    proto::client::{ClientRequest, ClientResponse},
-    transport::Bi,
-};
+use arbiter_proto::transport::Bi;
 use kameo::actor::Spawn;
 use tracing::{error, info};
 
@@ -24,7 +21,27 @@ pub enum ClientError {
     Auth(#[from] auth::Error),
 }
 
-pub type Transport = Box<dyn Bi<ClientRequest, Result<ClientResponse, ClientError>> + Send>;
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ConnectErrorCode {
+    Unknown,
+    ApprovalDenied,
+    NoUserAgentsOnline,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Request {
+    AuthChallengeRequest { pubkey: Vec<u8> },
+    AuthChallengeSolution { signature: Vec<u8> },
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Response {
+    AuthChallenge { pubkey: Vec<u8>, nonce: i32 },
+    AuthOk,
+    ClientConnectError { code: ConnectErrorCode },
+}
+
+pub type Transport = Box<dyn Bi<Request, Result<Response, ClientError>> + Send>;
 
 pub struct ClientConnection {
     pub(crate) db: db::DatabasePool,

server/crates/arbiter-server/src/actors/client/session.rs

@@ -1,36 +1,32 @@
-use arbiter_proto::proto::client::{ClientRequest, ClientResponse};
-use ed25519_dalek::VerifyingKey;
 use kameo::Actor;
 use tokio::select;
 use tracing::{error, info};
 
-use crate::{actors::{
-    GlobalActors, client::{ClientError, ClientConnection}, router::RegisterClient
-}, db};
+use crate::{
+    actors::{
+        GlobalActors,
+        client::{ClientConnection, ClientError, Request, Response},
+        router::RegisterClient,
+    },
+    db,
+};
 
 pub struct ClientSession {
     props: ClientConnection,
-    key: VerifyingKey,
 }
 
 impl ClientSession {
-    pub(crate) fn new(props: ClientConnection, key: VerifyingKey) -> Self {
-        Self { props, key }
+    pub(crate) fn new(props: ClientConnection) -> Self {
+        Self { props }
     }
 
-    pub async fn process_transport_inbound(&mut self, req: ClientRequest) -> Output {
-        let msg = req.payload.ok_or_else(|| {
-            error!(actor = "client", "Received message with no payload");
-            ClientError::MissingRequestPayload
-        })?;
-
-        match msg {
-            _ => Err(ClientError::UnexpectedRequestPayload),
-        }
+    pub async fn process_transport_inbound(&mut self, req: Request) -> Output {
+        let _ = req;
+        Err(ClientError::UnexpectedRequestPayload)
     }
 }
 
-type Output = Result<ClientResponse, ClientError>;
+type Output = Result<Response, ClientError>;
 
 impl Actor for ClientSession {
     type Args = Self;
@@ -92,7 +88,6 @@ impl ClientSession {
         use arbiter_proto::transport::DummyTransport;
         let transport: super::Transport = Box::new(DummyTransport::new());
         let props = ClientConnection::new(db, transport, actors);
-        let key = VerifyingKey::from_bytes(&[0u8; 32]).unwrap();
-        Self { props, key }
+        Self { props }
     }
 }

server/crates/arbiter-server/src/actors/evm/mod.rs

@@ -1,21 +1,26 @@
-use alloy::{consensus::TxEip1559, network::TxSigner, primitives::Address, signers::Signature};
-use diesel::{ExpressionMethods, OptionalExtension as _, QueryDsl, SelectableHelper as _, dsl::insert_into};
+use alloy::{consensus::TxEip1559, primitives::Address, signers::Signature};
+use diesel::{
+    ExpressionMethods, OptionalExtension as _, QueryDsl, SelectableHelper as _, dsl::insert_into,
+};
 use diesel_async::RunQueryDsl;
 use kameo::{Actor, actor::ActorRef, messages};
-use memsafe::MemSafe;
 use rand::{SeedableRng, rng, rngs::StdRng};
 
 use crate::{
     actors::keyholder::{CreateNew, Decrypt, KeyHolder},
-    db::{self, DatabasePool, models::{self, EvmBasicGrant, SqliteTimestamp}, schema},
+    db::{
+        self, DatabasePool,
+        models::{self, SqliteTimestamp},
+        schema,
+    },
     evm::{
-        self, RunKind,
+        self, ListGrantsError, RunKind,
         policies::{
-            FullGrant, SharedGrantSettings, SpecificGrant, SpecificMeaning,
-            ether_transfer::EtherTransfer,
-            token_transfers::TokenTransfer,
+            FullGrant, Grant, SharedGrantSettings, SpecificGrant, SpecificMeaning,
+            ether_transfer::EtherTransfer, token_transfers::TokenTransfer,
         },
     },
+    safe_cell::{SafeCell, SafeCellHandle as _},
 };
 
 pub use crate::evm::safe_signer;
@@ -88,7 +93,12 @@ impl EvmActor {
         // todo: audit
         let rng = StdRng::from_rng(&mut rng());
         let engine = evm::Engine::new(db.clone());
-        Self { keyholder, db, rng, engine }
+        Self {
+            keyholder,
+            db,
+            rng,
+            engine,
+        }
     }
 }
 
@@ -98,11 +108,7 @@ impl EvmActor {
     pub async fn generate(&mut self) -> Result<Address, Error> {
         let (mut key_cell, address) = safe_signer::generate(&mut self.rng);
 
-        // Move raw key bytes into a Vec<u8> MemSafe for KeyHolder
-        let plaintext = {
-            let reader = key_cell.read().expect("MemSafe read");
-            MemSafe::new(reader.to_vec()).expect("MemSafe allocation")
-        };
+        let plaintext = key_cell.read_inline(|reader| SafeCell::new(reader.to_vec()));
 
         let aead_id: i32 = self
             .keyholder
@@ -149,12 +155,24 @@ impl EvmActor {
         match grant {
             SpecificGrant::EtherTransfer(settings) => {
                 self.engine
-                    .create_grant::<EtherTransfer>(client_id, FullGrant { basic, specific: settings })
+                    .create_grant::<EtherTransfer>(
+                        client_id,
+                        FullGrant {
+                            basic,
+                            specific: settings,
+                        },
+                    )
                     .await
             }
             SpecificGrant::TokenTransfer(settings) => {
                 self.engine
-                    .create_grant::<TokenTransfer>(client_id, FullGrant { basic, specific: settings })
+                    .create_grant::<TokenTransfer>(
+                        client_id,
+                        FullGrant {
+                            basic,
+                            specific: settings,
+                        },
+                    )
                     .await
             }
         }
@@ -172,19 +190,12 @@ impl EvmActor {
     }
 
     #[message]
-    pub async fn useragent_list_grants(
-        &mut self,
-        wallet_id: Option<i32>,
-    ) -> Result<Vec<EvmBasicGrant>, Error> {
-        let mut conn = self.db.get().await?;
-        let mut query = schema::evm_basic_grant::table
-            .select(EvmBasicGrant::as_select())
-            .filter(schema::evm_basic_grant::revoked_at.is_null())
-            .into_boxed();
-        if let Some(wid) = wallet_id {
-            query = query.filter(schema::evm_basic_grant::wallet_id.eq(wid));
+    pub async fn useragent_list_grants(&mut self) -> Result<Vec<Grant<SpecificGrant>>, Error> {
+        match self.engine.list_all_grants().await {
+            Ok(grants) => Ok(grants),
+            Err(ListGrantsError::Database(db)) => Err(Error::Database(db)),
+            Err(ListGrantsError::Pool(pool)) => Err(Error::DatabasePool(pool)),
         }
-        Ok(query.load(&mut conn).await?)
     }
 
     #[message]
@@ -204,8 +215,14 @@ impl EvmActor {
             .ok_or(SignTransactionError::WalletNotFound)?;
         drop(conn);
 
-        let meaning = self.engine
-            .evaluate_transaction(wallet.id, client_id, transaction.clone(), RunKind::Execution)
+        let meaning = self
+            .engine
+            .evaluate_transaction(
+                wallet.id,
+                client_id,
+                transaction.clone(),
+                RunKind::Execution,
+            )
             .await?;
 
         Ok(meaning)
@@ -228,16 +245,23 @@ impl EvmActor {
             .ok_or(SignTransactionError::WalletNotFound)?;
         drop(conn);
 
-        let raw_key: MemSafe<Vec<u8>> = self
+        let raw_key: SafeCell<Vec<u8>> = self
             .keyholder
-            .ask(Decrypt { aead_id: wallet.aead_encrypted_id })
+            .ask(Decrypt {
+                aead_id: wallet.aead_encrypted_id,
+            })
             .await
             .map_err(|_| SignTransactionError::KeyholderSend)?;
 
-        let signer = safe_signer::SafeSigner::from_memsafe(raw_key)?;
+        let signer = safe_signer::SafeSigner::from_cell(raw_key)?;
 
         self.engine
-            .evaluate_transaction(wallet.id, client_id, transaction.clone(), RunKind::Execution)
+            .evaluate_transaction(
+                wallet.id,
+                client_id,
+                transaction.clone(),
+                RunKind::Execution,
+            )
             .await?;
 
         use alloy::network::TxSignerSync as _;

server/crates/arbiter-server/src/actors/keyholder/encryption/v1.rs

@@ -5,12 +5,13 @@ use chacha20poly1305::{
     AeadInPlace, Key, KeyInit as _, XChaCha20Poly1305, XNonce,
     aead::{AeadMut, Error, Payload},
 };
-use memsafe::MemSafe;
 use rand::{
     Rng as _, SeedableRng,
     rngs::{StdRng, SysRng},
 };
 
+use crate::safe_cell::{SafeCell, SafeCellHandle as _};
+
 pub const ROOT_KEY_TAG: &[u8] = "arbiter/seal/v1".as_bytes();
 pub const TAG: &[u8] = "arbiter/private-key/v1".as_bytes();
 
@@ -47,40 +48,37 @@ impl<'a> TryFrom<&'a [u8]> for Nonce {
     }
 }
 
-pub struct KeyCell(pub MemSafe<Key>);
-impl From<MemSafe<Key>> for KeyCell {
-    fn from(value: MemSafe<Key>) -> Self {
+pub struct KeyCell(pub SafeCell<Key>);
+impl From<SafeCell<Key>> for KeyCell {
+    fn from(value: SafeCell<Key>) -> Self {
         Self(value)
     }
 }
-impl TryFrom<MemSafe<Vec<u8>>> for KeyCell {
+impl TryFrom<SafeCell<Vec<u8>>> for KeyCell {
     type Error = ();
 
-    fn try_from(mut value: MemSafe<Vec<u8>>) -> Result<Self, Self::Error> {
-        let value = value.read().unwrap();
+    fn try_from(mut value: SafeCell<Vec<u8>>) -> Result<Self, Self::Error> {
+        let value = value.read();
         if value.len() != size_of::<Key>() {
             return Err(());
         }
-        let mut cell = MemSafe::new(Key::default()).unwrap();
-        {
-            let mut cell_write = cell.write().unwrap();
-            let cell_slice: &mut [u8] = cell_write.as_mut();
-            cell_slice.copy_from_slice(&value);
-        }
+        let cell = SafeCell::new_inline(|cell_write: &mut Key| {
+            cell_write.copy_from_slice(&value);
+        });
         Ok(Self(cell))
     }
 }
 
 impl KeyCell {
     pub fn new_secure_random() -> Self {
-        let mut key = MemSafe::new(Key::default()).unwrap();
-        {
-            let mut key_buffer = key.write().unwrap();
-            let key_buffer: &mut [u8] = key_buffer.as_mut();
-
+        let key = SafeCell::new_inline(|key_buffer: &mut Key| {
+            #[allow(
+                clippy::unwrap_used,
+                reason = "Rng failure is unrecoverable and should panic"
+            )]
             let mut rng = StdRng::try_from_rng(&mut SysRng).unwrap();
             rng.fill_bytes(key_buffer);
-        }
+        });
 
         key.into()
     }
@@ -91,7 +89,7 @@ impl KeyCell {
         associated_data: &[u8],
         mut buffer: impl AsMut<Vec<u8>>,
     ) -> Result<(), Error> {
-        let key_reader = self.0.read().unwrap();
+        let key_reader = self.0.read();
         let key_ref = key_reader.deref();
         let cipher = XChaCha20Poly1305::new(key_ref);
         let nonce = XNonce::from_slice(nonce.0.as_ref());
@@ -102,13 +100,13 @@ impl KeyCell {
         &mut self,
         nonce: &Nonce,
         associated_data: &[u8],
-        buffer: &mut MemSafe<Vec<u8>>,
+        buffer: &mut SafeCell<Vec<u8>>,
     ) -> Result<(), Error> {
-        let key_reader = self.0.read().unwrap();
+        let key_reader = self.0.read();
         let key_ref = key_reader.deref();
         let cipher = XChaCha20Poly1305::new(key_ref);
         let nonce = XNonce::from_slice(nonce.0.as_ref());
-        let mut buffer = buffer.write().unwrap();
+        let mut buffer = buffer.write();
         let buffer: &mut Vec<u8> = buffer.as_mut();
         cipher.decrypt_in_place(nonce, associated_data, buffer)
     }
@@ -119,7 +117,7 @@ impl KeyCell {
         associated_data: &[u8],
         plaintext: impl AsRef<[u8]>,
     ) -> Result<Vec<u8>, Error> {
-        let key_reader = self.0.read().unwrap();
+        let key_reader = self.0.read();
         let key_ref = key_reader.deref();
         let mut cipher = XChaCha20Poly1305::new(key_ref);
         let nonce = XNonce::from_slice(nonce.0.as_ref());
@@ -139,6 +137,10 @@ pub type Salt = [u8; ArgonSalt::RECOMMENDED_LENGTH];
 
 pub fn generate_salt() -> Salt {
     let mut salt = Salt::default();
+    #[allow(
+        clippy::unwrap_used,
+        reason = "Rng failure is unrecoverable and should panic"
+    )]
     let mut rng = StdRng::try_from_rng(&mut SysRng).unwrap();
     rng.fill_bytes(&mut salt);
     salt
@@ -146,19 +148,23 @@ pub fn generate_salt() -> Salt {
 
 /// User password might be of different length, have not enough entropy, etc...
 /// Derive a fixed-length key from the password using Argon2id, which is designed for password hashing and key derivation.
-pub fn derive_seal_key(mut password: MemSafe<Vec<u8>>, salt: &Salt) -> KeyCell {
+pub fn derive_seal_key(mut password: SafeCell<Vec<u8>>, salt: &Salt) -> KeyCell {
+    #[allow(clippy::unwrap_used)]
     let params = argon2::Params::new(262_144, 3, 4, None).unwrap();
     let hasher = Argon2::new(Algorithm::Argon2id, argon2::Version::V0x13, params);
-    let mut key = MemSafe::new(Key::default()).unwrap();
-    {
-        let password_source = password.read().unwrap();
-        let mut key_buffer = key.write().unwrap();
+    let mut key = SafeCell::new(Key::default());
+    password.read_inline(|password_source| {
+        let mut key_buffer = key.write();
         let key_buffer: &mut [u8] = key_buffer.as_mut();
 
+        #[allow(
+            clippy::unwrap_used,
+            reason = "Better fail completely than return a weak key"
+        )]
         hasher
             .hash_password_into(password_source.deref(), salt, key_buffer)
             .unwrap();
-    }
+    });
 
     key.into()
 }
@@ -166,20 +172,20 @@ pub fn derive_seal_key(mut password: MemSafe<Vec<u8>>, salt: &Salt) -> KeyCell {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use memsafe::MemSafe;
+    use crate::safe_cell::SafeCell;
 
     #[test]
     pub fn derive_seal_key_deterministic() {
         static PASSWORD: &[u8] = b"password";
-        let password = MemSafe::new(PASSWORD.to_vec()).unwrap();
-        let password2 = MemSafe::new(PASSWORD.to_vec()).unwrap();
+        let password = SafeCell::new(PASSWORD.to_vec());
+        let password2 = SafeCell::new(PASSWORD.to_vec());
         let salt = generate_salt();
 
         let mut key1 = derive_seal_key(password, &salt);
         let mut key2 = derive_seal_key(password2, &salt);
 
-        let key1_reader = key1.0.read().unwrap();
-        let key2_reader = key2.0.read().unwrap();
+        let key1_reader = key1.0.read();
+        let key2_reader = key2.0.read();
 
         assert_eq!(key1_reader.deref(), key2_reader.deref());
     }
@@ -187,11 +193,11 @@ mod tests {
     #[test]
     pub fn successful_derive() {
         static PASSWORD: &[u8] = b"password";
-        let password = MemSafe::new(PASSWORD.to_vec()).unwrap();
+        let password = SafeCell::new(PASSWORD.to_vec());
         let salt = generate_salt();
 
         let mut key = derive_seal_key(password, &salt);
-        let key_reader = key.0.read().unwrap();
+        let key_reader = key.0.read();
         let key_ref = key_reader.deref();
 
         assert_ne!(key_ref.as_slice(), &[0u8; 32][..]);
@@ -200,7 +206,7 @@ mod tests {
     #[test]
     pub fn encrypt_decrypt() {
         static PASSWORD: &[u8] = b"password";
-        let password = MemSafe::new(PASSWORD.to_vec()).unwrap();
+        let password = SafeCell::new(PASSWORD.to_vec());
         let salt = generate_salt();
 
         let mut key = derive_seal_key(password, &salt);
@@ -212,12 +218,12 @@ mod tests {
             .unwrap();
         assert_ne!(buffer, b"secret data");
 
-        let mut buffer = MemSafe::new(buffer).unwrap();
+        let mut buffer = SafeCell::new(buffer);
 
         key.decrypt_in_place(&nonce, associated_data, &mut buffer)
             .unwrap();
 
-        let buffer = buffer.read().unwrap();
+        let buffer = buffer.read();
         assert_eq!(*buffer, b"secret data");
     }
 

server/crates/arbiter-server/src/actors/keyholder/mod.rs

@@ -5,14 +5,17 @@ use diesel::{
 };
 use diesel_async::{AsyncConnection, RunQueryDsl};
 use kameo::{Actor, Reply, messages};
-use memsafe::MemSafe;
 use strum::{EnumDiscriminants, IntoDiscriminant};
 use tracing::{error, info};
 
-use crate::db::{
-    self,
-    models::{self, RootKeyHistory},
-    schema::{self},
+use crate::safe_cell::SafeCell;
+use crate::{
+    db::{
+        self,
+        models::{self, RootKeyHistory},
+        schema::{self},
+    },
+    safe_cell::SafeCellHandle as _,
 };
 use encryption::v1::{self, KeyCell, Nonce};
 
@@ -136,7 +139,7 @@ impl KeyHolder {
     }
 
     #[message]
-    pub async fn bootstrap(&mut self, seal_key_raw: MemSafe<Vec<u8>>) -> Result<(), Error> {
+    pub async fn bootstrap(&mut self, seal_key_raw: SafeCell<Vec<u8>>) -> Result<(), Error> {
         if !matches!(self.state, State::Unbootstrapped) {
             return Err(Error::AlreadyBootstrapped);
         }
@@ -148,16 +151,15 @@ impl KeyHolder {
         let root_key_nonce = v1::Nonce::default();
         let data_encryption_nonce = v1::Nonce::default();
 
-        let root_key_ciphertext: Vec<u8> = {
-            let root_key_reader = root_key.0.read().unwrap();
-            let root_key_reader = root_key_reader.as_slice();
+        let root_key_ciphertext: Vec<u8> = root_key.0.read_inline(|reader| {
+            let root_key_reader = reader.as_slice();
             seal_key
                 .encrypt(&root_key_nonce, v1::ROOT_KEY_TAG, root_key_reader)
                 .map_err(|err| {
                     error!(?err, "Fatal bootstrap error");
                     Error::Encryption(err)
-                })?
-        };
+                })
+        })?;
 
         let mut conn = self.db.get().await?;
 
@@ -199,7 +201,7 @@ impl KeyHolder {
     }
 
     #[message]
-    pub async fn try_unseal(&mut self, seal_key_raw: MemSafe<Vec<u8>>) -> Result<(), Error> {
+    pub async fn try_unseal(&mut self, seal_key_raw: SafeCell<Vec<u8>>) -> Result<(), Error> {
         let State::Sealed {
             root_key_history_id,
         } = &self.state
@@ -225,7 +227,7 @@ impl KeyHolder {
         })?;
         let mut seal_key = v1::derive_seal_key(seal_key_raw, &salt);
 
-        let mut root_key = MemSafe::new(current_key.ciphertext.clone()).unwrap();
+        let mut root_key = SafeCell::new(current_key.ciphertext.clone());
 
         let nonce = v1::Nonce::try_from(current_key.root_key_encryption_nonce.as_slice()).map_err(
             |_| {
@@ -256,7 +258,7 @@ impl KeyHolder {
 
     // Decrypts the `aead_encrypted` entry with the given ID and returns the plaintext
     #[message]
-    pub async fn decrypt(&mut self, aead_id: i32) -> Result<MemSafe<Vec<u8>>, Error> {
+    pub async fn decrypt(&mut self, aead_id: i32) -> Result<SafeCell<Vec<u8>>, Error> {
         let State::Unsealed { root_key, .. } = &mut self.state else {
             return Err(Error::NotBootstrapped);
         };
@@ -279,14 +281,14 @@ impl KeyHolder {
             );
             Error::BrokenDatabase
         })?;
-        let mut output = MemSafe::new(row.ciphertext).unwrap();
+        let mut output = SafeCell::new(row.ciphertext);
         root_key.decrypt_in_place(&nonce, v1::TAG, &mut output)?;
         Ok(output)
     }
 
     // Creates new `aead_encrypted` entry in the database and returns it's ID
     #[message]
-    pub async fn create_new(&mut self, mut plaintext: MemSafe<Vec<u8>>) -> Result<i32, Error> {
+    pub async fn create_new(&mut self, mut plaintext: SafeCell<Vec<u8>>) -> Result<i32, Error> {
         let State::Unsealed {
             root_key,
             root_key_history_id,
@@ -299,7 +301,7 @@ impl KeyHolder {
         // Borrow checker note: &mut borrow a few lines above is disjoint from this field
         let nonce = Self::get_new_nonce(&self.db, *root_key_history_id).await?;
 
-        let mut ciphertext_buffer = plaintext.write().unwrap();
+        let mut ciphertext_buffer = plaintext.write();
         let ciphertext_buffer: &mut Vec<u8> = ciphertext_buffer.as_mut();
         root_key.encrypt_in_place(&nonce, v1::TAG, &mut *ciphertext_buffer)?;
 
@@ -313,7 +315,7 @@ impl KeyHolder {
                 current_nonce: nonce.to_vec(),
                 schema_version: 1,
                 associated_root_key_id: *root_key_history_id,
-                created_at: Utc::now().into()
+                created_at: Utc::now().into(),
             })
             .returning(schema::aead_encrypted::id)
             .get_result(&mut conn)
@@ -348,15 +350,17 @@ mod tests {
     use diesel::SelectableHelper;
 
     use diesel_async::RunQueryDsl;
-    use memsafe::MemSafe;
 
-    use crate::db::{self};
+    use crate::{
+        db::{self},
+        safe_cell::SafeCell,
+    };
 
     use super::*;
 
     async fn bootstrapped_actor(db: &db::DatabasePool) -> KeyHolder {
         let mut actor = KeyHolder::new(db.clone()).await.unwrap();
-        let seal_key = MemSafe::new(b"test-seal-key".to_vec()).unwrap();
+        let seal_key = SafeCell::new(b"test-seal-key".to_vec());
         actor.bootstrap(seal_key).await.unwrap();
         actor
     }
@@ -391,7 +395,7 @@ mod tests {
         assert_eq!(root_row.data_encryption_nonce, n2.to_vec());
 
         let id = actor
-            .create_new(MemSafe::new(b"post-interleave".to_vec()).unwrap())
+            .create_new(SafeCell::new(b"post-interleave".to_vec()))
             .await
             .unwrap();
         let row: models::AeadEncrypted = schema::aead_encrypted::table

server/crates/arbiter-server/src/actors/router/mod.rs

@@ -1,17 +1,20 @@
-use std::{
-    collections::{HashMap},
-    ops::ControlFlow,
-};
+use std::{collections::HashMap, ops::ControlFlow};
 
+use ed25519_dalek::VerifyingKey;
 use kameo::{
     Actor,
     actor::{ActorId, ActorRef},
     messages,
     prelude::{ActorStopReason, Context, WeakActorRef},
+    reply::DelegatedReply,
 };
-use tracing::info;
+use tokio::{sync::watch, task::JoinSet};
+use tracing::{info, warn};
 
-use crate::actors::{client::session::ClientSession, user_agent::session::UserAgentSession};
+use crate::actors::{
+    client::session::ClientSession,
+    user_agent::session::{RequestNewClientApproval, UserAgentSession},
+};
 
 #[derive(Default)]
 pub struct MessageRouter {
@@ -53,6 +56,73 @@ impl Actor for MessageRouter {
     }
 }
 
+#[derive(Debug, thiserror::Error, Clone, PartialEq, Eq, Hash)]
+pub enum ApprovalError {
+    #[error("No user agents connected")]
+    NoUserAgentsConnected,
+}
+
+async fn request_client_approval(
+    user_agents: &[WeakActorRef<UserAgentSession>],
+    client_pubkey: VerifyingKey,
+) -> Result<bool, ApprovalError> {
+    if user_agents.is_empty() {
+        return Err(ApprovalError::NoUserAgentsConnected);
+    }
+
+    let mut pool = JoinSet::new();
+    let (cancel_tx, cancel_rx) = watch::channel(());
+
+    for weak_ref in user_agents {
+        match weak_ref.upgrade() {
+            Some(agent) => {
+                let cancel_rx = cancel_rx.clone();
+                pool.spawn(async move {
+                    agent
+                        .ask(RequestNewClientApproval {
+                            client_pubkey,
+                            cancel_flag: cancel_rx.clone(),
+                        })
+                        .await
+                });
+            }
+            None => {
+                warn!(
+                    id = weak_ref.id().to_string(),
+                    actor = "MessageRouter",
+                    event = "useragent.disconnected_before_approval"
+                );
+            }
+        }
+    }
+
+    while let Some(result) = pool.join_next().await {
+        match result {
+            Ok(Ok(approved)) => {
+                // cancel other pending requests
+                let _ = cancel_tx.send(());
+                return Ok(approved);
+            }
+            Ok(Err(err)) => {
+                warn!(
+                    ?err,
+                    actor = "MessageRouter",
+                    event = "useragent.approval_error"
+                );
+            }
+            Err(err) => {
+                warn!(
+                    ?err,
+                    actor = "MessageRouter",
+                    event = "useragent.approval_task_failed"
+                );
+            }
+        }
+    }
+
+    Err(ApprovalError::NoUserAgentsConnected)
+}
+
 #[messages]
 impl MessageRouter {
     #[message(ctx)]
@@ -76,4 +146,29 @@ impl MessageRouter {
         ctx.actor_ref().link(&actor).await;
         self.clients.insert(actor.id(), actor);
     }
+
+    #[message(ctx)]
+    pub async fn request_client_approval(
+        &mut self,
+        client_pubkey: VerifyingKey,
+        ctx: &mut Context<Self, DelegatedReply<Result<bool, ApprovalError>>>,
+    ) -> DelegatedReply<Result<bool, ApprovalError>> {
+        let (reply, Some(reply_sender)) = ctx.reply_sender() else {
+            unreachable!("Expected `request_client_approval` to have callback channel");
+        };
+
+        let weak_refs = self
+            .user_agents
+            .values()
+            .map(|agent| agent.downgrade())
+            .collect::<Vec<_>>();
+
+        // handle in subtask to not to lock the actor
+        tokio::task::spawn(async move {
+            let result = request_client_approval(&weak_refs, client_pubkey).await;
+            reply_sender.send(result);
+        });
+
+        reply
+    }
 }

server/crates/arbiter-server/src/actors/user_agent/auth.rs

@@ -1,13 +1,10 @@
-use arbiter_proto::proto::user_agent::{
-    AuthChallengeRequest, AuthChallengeSolution, UserAgentRequest,
-    user_agent_request::Payload as UserAgentRequestPayload,
-};
-use ed25519_dalek::VerifyingKey;
 use tracing::error;
 
 use crate::actors::user_agent::{
-    UserAgentConnection,
-    auth::state::{AuthContext, AuthStateMachine}, session::UserAgentSession,
+    Request, UserAgentConnection,
+    auth::state::{AuthContext, AuthStateMachine},
+    AuthPublicKey,
+    session::UserAgentSession,
 };
 
 #[derive(thiserror::Error, Debug, PartialEq)]
@@ -37,32 +34,20 @@ pub enum Error {
 mod state;
 use state::*;
 
-fn parse_auth_event(payload: UserAgentRequestPayload) -> Result<AuthEvents, Error> {
+fn parse_auth_event(payload: Request) -> Result<AuthEvents, Error> {
     match payload {
-        UserAgentRequestPayload::AuthChallengeRequest(AuthChallengeRequest {
+        Request::AuthChallengeRequest {
             pubkey,
             bootstrap_token: None,
-        }) => {
-            let pubkey_bytes = pubkey.as_array().ok_or(Error::InvalidClientPubkeyLength)?;
-            let pubkey = VerifyingKey::from_bytes(pubkey_bytes)
-                .map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
-            Ok(AuthEvents::AuthRequest(ChallengeRequest {
-                pubkey: pubkey.into(),
-            }))
-        }
-        UserAgentRequestPayload::AuthChallengeRequest(AuthChallengeRequest {
+        } => Ok(AuthEvents::AuthRequest(ChallengeRequest { pubkey })),
+        Request::AuthChallengeRequest {
             pubkey,
             bootstrap_token: Some(token),
-        }) => {
-            let pubkey_bytes = pubkey.as_array().ok_or(Error::InvalidClientPubkeyLength)?;
-            let pubkey = VerifyingKey::from_bytes(pubkey_bytes)
-                .map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
-            Ok(AuthEvents::BootstrapAuthRequest(BootstrapAuthRequest {
-                pubkey: pubkey.into(),
-                token,
-            }))
-        }
-        UserAgentRequestPayload::AuthChallengeSolution(AuthChallengeSolution { signature }) => {
+        } => Ok(AuthEvents::BootstrapAuthRequest(BootstrapAuthRequest {
+            pubkey,
+            token,
+        })),
+        Request::AuthChallengeSolution { signature } => {
             Ok(AuthEvents::ReceivedSolution(ChallengeSolution {
                 solution: signature,
             }))
@@ -71,16 +56,13 @@ fn parse_auth_event(payload: UserAgentRequestPayload) -> Result<AuthEvents, Erro
     }
 }
 
-pub async fn authenticate(props: &mut UserAgentConnection) -> Result<VerifyingKey, Error> {
+pub async fn authenticate(props: &mut UserAgentConnection) -> Result<AuthPublicKey, Error> {
     let mut state = AuthStateMachine::new(AuthContext::new(props));
 
     loop {
-        // This is needed because `state` now holds mutable reference to `ConnectionProps`, so we can't directly access `props` here
+        // `state` holds a mutable reference to `props` so we can't access it directly here
         let transport = state.context_mut().conn.transport.as_mut();
-        let Some(UserAgentRequest {
-            payload: Some(payload),
-        }) = transport.recv().await
-        else {
+        let Some(payload) = transport.recv().await else {
             return Err(Error::Transport);
         };
 
@@ -110,9 +92,10 @@ pub async fn authenticate(props: &mut UserAgentConnection) -> Result<VerifyingKe
     }
 }
 
-
-pub async fn authenticate_and_create(mut props: UserAgentConnection) -> Result<UserAgentSession, Error> {
-    let key = authenticate(&mut props).await?;
-    let session = UserAgentSession::new(props, key.clone());
+pub async fn authenticate_and_create(
+    mut props: UserAgentConnection,
+) -> Result<UserAgentSession, Error> {
+    let _key = authenticate(&mut props).await?;
+    let session = UserAgentSession::new(props);
     Ok(session)
 }

server/crates/arbiter-server/src/actors/user_agent/auth/state.rs

@@ -1,30 +1,28 @@
-use arbiter_proto::proto::user_agent::{
-    AuthChallenge, UserAgentResponse,
-    user_agent_response::Payload as UserAgentResponsePayload,
-};
 use diesel::{ExpressionMethods as _, OptionalExtension as _, QueryDsl, update};
 use diesel_async::RunQueryDsl;
-use ed25519_dalek::VerifyingKey;
 use tracing::error;
 
 use super::Error;
 use crate::{
-    actors::{bootstrap::ConsumeToken, user_agent::UserAgentConnection},
+    actors::{
+        bootstrap::ConsumeToken,
+        user_agent::{AuthPublicKey, Response, UserAgentConnection},
+    },
     db::schema,
 };
 
 pub struct ChallengeRequest {
-    pub pubkey: VerifyingKey,
+    pub pubkey: AuthPublicKey,
 }
 
 pub struct BootstrapAuthRequest {
-    pub pubkey: VerifyingKey,
+    pub pubkey: AuthPublicKey,
     pub token: String,
 }
 
 pub struct ChallengeContext {
-    pub challenge: AuthChallenge,
-    pub key: VerifyingKey,
+    pub challenge_nonce: i32,
+    pub key: AuthPublicKey,
 }
 
 pub struct ChallengeSolution {
@@ -36,8 +34,8 @@ smlang::statemachine!(
     custom_error: true,
     transitions: {
         *Init + AuthRequest(ChallengeRequest) / async prepare_challenge = SentChallenge(ChallengeContext),
-        Init + BootstrapAuthRequest(BootstrapAuthRequest) [async verify_bootstrap_token] / provide_key_bootstrap = AuthOk(VerifyingKey),
-        SentChallenge(ChallengeContext) + ReceivedSolution(ChallengeSolution) [async verify_solution] / provide_key = AuthOk(VerifyingKey),
+        Init + BootstrapAuthRequest(BootstrapAuthRequest) / async verify_bootstrap_token = AuthOk(AuthPublicKey),
+        SentChallenge(ChallengeContext) + ReceivedSolution(ChallengeSolution) / async verify_solution = AuthOk(AuthPublicKey),
     }
 );
 
@@ -76,7 +74,9 @@ async fn create_nonce(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Resu
         })
 }
 
-async fn register_key(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Result<(), Error> {
+async fn register_key(db: &crate::db::DatabasePool, pubkey: &AuthPublicKey) -> Result<(), Error> {
+    let pubkey_bytes = pubkey.to_stored_bytes();
+    let key_type = pubkey.key_type();
     let mut conn = db.get().await.map_err(|e| {
         error!(error = ?e, "Database pool error");
         Error::DatabasePoolUnavailable
@@ -84,8 +84,9 @@ async fn register_key(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Resu
 
     diesel::insert_into(schema::useragent_client::table)
         .values((
-            schema::useragent_client::public_key.eq(pubkey_bytes.to_vec()),
+            schema::useragent_client::public_key.eq(pubkey_bytes),
             schema::useragent_client::nonce.eq(1),
+            schema::useragent_client::key_type.eq(key_type),
         ))
         .execute(&mut conn)
         .await
@@ -110,40 +111,16 @@ impl<'a> AuthContext<'a> {
 impl AuthStateMachineContext for AuthContext<'_> {
     type Error = Error;
 
-    async fn verify_solution(
-        &self,
-        ChallengeContext { challenge, key }: &ChallengeContext,
-        ChallengeSolution { solution }: &ChallengeSolution,
-    ) -> Result<bool, Self::Error> {
-        let formatted_challenge =
-            arbiter_proto::format_challenge(challenge.nonce, &challenge.pubkey);
-
-        let signature = solution.as_slice().try_into().map_err(|_| {
-            error!(?solution, "Invalid signature length");
-            Error::InvalidChallengeSolution
-        })?;
-
-        let valid = key.verify_strict(&formatted_challenge, &signature).is_ok();
-
-        Ok(valid)
-    }
-
     async fn prepare_challenge(
         &mut self,
         ChallengeRequest { pubkey }: ChallengeRequest,
     ) -> Result<ChallengeContext, Self::Error> {
-        let nonce = create_nonce(&self.conn.db, pubkey.as_bytes()).await?;
-
-        let challenge = AuthChallenge {
-            pubkey: pubkey.as_bytes().to_vec(),
-            nonce,
-        };
+        let stored_bytes = pubkey.to_stored_bytes();
+        let nonce = create_nonce(&self.conn.db, &stored_bytes).await?;
 
         self.conn
             .transport
-            .send(Ok(UserAgentResponse {
-                payload: Some(UserAgentResponsePayload::AuthChallenge(challenge.clone())),
-            }))
+            .send(Ok(Response::AuthChallenge { nonce }))
             .await
             .map_err(|e| {
                 error!(?e, "Failed to send auth challenge");
@@ -151,7 +128,7 @@ impl AuthStateMachineContext for AuthContext<'_> {
             })?;
 
         Ok(ChallengeContext {
-            challenge,
+            challenge_nonce: nonce,
             key: pubkey,
         })
     }
@@ -159,9 +136,9 @@ impl AuthStateMachineContext for AuthContext<'_> {
     #[allow(missing_docs)]
     #[allow(clippy::result_unit_err)]
     async fn verify_bootstrap_token(
-        &self,
-        BootstrapAuthRequest { pubkey, token }: &BootstrapAuthRequest,
-    ) -> Result<bool, Self::Error> {
+        &mut self,
+        BootstrapAuthRequest { pubkey, token }: BootstrapAuthRequest,
+    ) -> Result<AuthPublicKey, Self::Error> {
         let token_ok: bool = self
             .conn
             .actors
@@ -171,32 +148,70 @@ impl AuthStateMachineContext for AuthContext<'_> {
             })
             .await
             .map_err(|e| {
-                error!(?pubkey, "Failed to consume bootstrap token: {e}");
+                error!(?e, "Failed to consume bootstrap token");
                 Error::BootstrapperActorUnreachable
             })?;
 
         if !token_ok {
-            error!(?pubkey, "Invalid bootstrap token provided");
+            error!("Invalid bootstrap token provided");
             return Err(Error::InvalidBootstrapToken);
         }
 
-        register_key(&self.conn.db, pubkey.as_bytes()).await?;
+        register_key(&self.conn.db, &pubkey).await?;
 
-        Ok(true)
+        self.conn
+                .transport
+                .send(Ok(Response::AuthOk))
+                .await
+                .map_err(|_| Error::Transport)?;
+
+        Ok(pubkey)
     }
 
-    fn provide_key_bootstrap(
+    #[allow(missing_docs)]
+    #[allow(clippy::unused_unit)]
+    async fn verify_solution(
         &mut self,
-        event_data: BootstrapAuthRequest,
-    ) -> Result<VerifyingKey, Self::Error> {
-        Ok(event_data.pubkey)
-    }
+        ChallengeContext { challenge_nonce, key }: &ChallengeContext,
+        ChallengeSolution { solution }: ChallengeSolution,
+    ) -> Result<AuthPublicKey, Self::Error> {
+        let formatted = arbiter_proto::format_challenge(*challenge_nonce, &key.to_stored_bytes());
 
-    fn provide_key(
-        &mut self,
-        state_data: &ChallengeContext,
-        _: ChallengeSolution,
-    ) -> Result<VerifyingKey, Self::Error> {
-        Ok(state_data.key)
+        let valid = match key {
+            AuthPublicKey::Ed25519(vk) => {
+                let sig = solution.as_slice().try_into().map_err(|_| {
+                    error!(?solution, "Invalid Ed25519 signature length");
+                    Error::InvalidChallengeSolution
+                })?;
+                vk.verify_strict(&formatted, &sig).is_ok()
+            }
+            AuthPublicKey::EcdsaSecp256k1(vk) => {
+                use k256::ecdsa::signature::Verifier as _;
+                let sig = k256::ecdsa::Signature::try_from(solution.as_slice()).map_err(|_| {
+                    error!(?solution, "Invalid ECDSA signature bytes");
+                    Error::InvalidChallengeSolution
+                })?;
+                vk.verify(&formatted, &sig).is_ok()
+            }
+            AuthPublicKey::Rsa(pk) => {
+                use rsa::signature::Verifier as _;
+                let verifying_key = rsa::pss::VerifyingKey::<sha2::Sha256>::new(pk.clone());
+                let sig = rsa::pss::Signature::try_from(solution.as_slice()).map_err(|_| {
+                    error!(?solution, "Invalid RSA signature bytes");
+                    Error::InvalidChallengeSolution
+                })?;
+                verifying_key.verify(&formatted, &sig).is_ok()
+            }
+        };
+
+        if valid {
+            self.conn
+                .transport
+                .send(Ok(Response::AuthOk))
+                .await
+                .map_err(|_| Error::Transport)?;
+        }
+
+        Ok(key.clone())
     }
 }

server/crates/arbiter-server/src/actors/user_agent/mod.rs

@@ -1,19 +1,17 @@
-use arbiter_proto::{
-    proto::user_agent::{UserAgentRequest, UserAgentResponse},
-    transport::Bi,
-};
+use alloy::primitives::Address;
+use arbiter_proto::transport::Bi;
 use kameo::actor::Spawn as _;
 use tracing::{error, info};
 
 use crate::{
-    actors::{GlobalActors, user_agent::session::UserAgentSession},
-    db::{self},
+    actors::{GlobalActors, evm, user_agent::session::UserAgentSession},
+    db::{self, models::KeyType},
+    evm::policies::SharedGrantSettings,
+    evm::policies::{Grant, SpecificGrant},
 };
 
 #[derive(Debug, thiserror::Error, PartialEq)]
-pub enum UserAgentError {
-    #[error("Expected message with payload")]
-    MissingRequestPayload,
+pub enum TransportResponseError {
     #[error("Unexpected request payload")]
     UnexpectedRequestPayload,
     #[error("Invalid state for unseal encrypted key")]
@@ -30,8 +28,127 @@ pub enum UserAgentError {
     ConnectionRegistrationFailed,
 }
 
-pub type Transport =
-    Box<dyn Bi<UserAgentRequest, Result<UserAgentResponse, UserAgentError>> + Send>;
+/// Abstraction over Ed25519 / ECDSA-secp256k1 / RSA public keys used during the auth handshake.
+#[derive(Clone, Debug)]
+pub enum AuthPublicKey {
+    Ed25519(ed25519_dalek::VerifyingKey),
+    /// Compressed SEC1 public key; signature bytes are raw 64-byte (r||s).
+    EcdsaSecp256k1(k256::ecdsa::VerifyingKey),
+    /// RSA-2048+ public key (Windows Hello / KeyCredentialManager); signature bytes are PSS+SHA-256.
+    Rsa(rsa::RsaPublicKey),
+}
+
+impl AuthPublicKey {
+    /// Canonical bytes stored in DB and echoed back in the challenge.
+    /// Ed25519: raw 32 bytes. ECDSA: SEC1 compressed 33 bytes. RSA: DER-encoded SPKI.
+    pub fn to_stored_bytes(&self) -> Vec<u8> {
+        match self {
+            AuthPublicKey::Ed25519(k) => k.to_bytes().to_vec(),
+            // SEC1 compressed (33 bytes) is the natural compact format for secp256k1
+            AuthPublicKey::EcdsaSecp256k1(k) => k.to_encoded_point(true).as_bytes().to_vec(),
+            AuthPublicKey::Rsa(k) => {
+                use rsa::pkcs8::EncodePublicKey as _;
+                #[allow(clippy::expect_used)]
+                k.to_public_key_der()
+                    .expect("rsa SPKI encoding is infallible")
+                    .to_vec()
+            }
+        }
+    }
+
+    pub fn key_type(&self) -> KeyType {
+        match self {
+            AuthPublicKey::Ed25519(_) => KeyType::Ed25519,
+            AuthPublicKey::EcdsaSecp256k1(_) => KeyType::EcdsaSecp256k1,
+            AuthPublicKey::Rsa(_) => KeyType::Rsa,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum UnsealError {
+    InvalidKey,
+    Unbootstrapped,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum BootstrapError {
+    AlreadyBootstrapped,
+    InvalidKey,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum VaultState {
+    Unbootstrapped,
+    Sealed,
+    Unsealed,
+}
+
+#[derive(Debug, Clone)]
+pub enum Request {
+    AuthChallengeRequest {
+        pubkey: AuthPublicKey,
+        bootstrap_token: Option<String>,
+    },
+    AuthChallengeSolution {
+        signature: Vec<u8>,
+    },
+    UnsealStart {
+        client_pubkey: x25519_dalek::PublicKey,
+    },
+    UnsealEncryptedKey {
+        nonce: Vec<u8>,
+        ciphertext: Vec<u8>,
+        associated_data: Vec<u8>,
+    },
+    BootstrapEncryptedKey {
+        nonce: Vec<u8>,
+        ciphertext: Vec<u8>,
+        associated_data: Vec<u8>,
+    },
+    QueryVaultState,
+    EvmWalletCreate,
+    EvmWalletList,
+    ClientConnectionResponse {
+        approved: bool,
+    },
+
+    ListGrants,
+    EvmGrantCreate {
+        client_id: i32,
+        shared: SharedGrantSettings,
+        specific: SpecificGrant,
+    },
+    EvmGrantDelete {
+        grant_id: i32,
+    },
+}
+
+#[derive(Debug)]
+pub enum Response {
+    AuthChallenge {
+        nonce: i32,
+    },
+    AuthOk,
+    UnsealStartResponse {
+        server_pubkey: x25519_dalek::PublicKey,
+    },
+    UnsealResult(Result<(), UnsealError>),
+    BootstrapResult(Result<(), BootstrapError>),
+    VaultState(VaultState),
+    ClientConnectionRequest {
+        pubkey: ed25519_dalek::VerifyingKey,
+    },
+    ClientConnectionCancel,
+    EvmWalletCreate(Result<(), evm::Error>),
+    EvmWalletList(Vec<Address>),
+
+    ListGrants(Vec<Grant<SpecificGrant>>),
+    EvmGrantCreate(Result<i32, evm::Error>),
+    EvmGrantDelete(Result<(), evm::Error>),
+}
+
+pub type Transport = Box<dyn Bi<Request, Result<Response, TransportResponseError>> + Send>;
 
 pub struct UserAgentConnection {
     db: db::DatabasePool,
@@ -52,6 +169,7 @@ impl UserAgentConnection {
 pub mod auth;
 pub mod session;
 
+#[tracing::instrument(skip(props))]
 pub async fn connect_user_agent(props: UserAgentConnection) {
     match auth::authenticate_and_create(props).await {
         Ok(session) => {

server/crates/arbiter-server/src/actors/user_agent/session.rs

@@ -1,254 +1,146 @@
-use std::{ops::DerefMut, sync::Mutex};
-
-use arbiter_proto::proto::{
-    evm as evm_proto,
-    user_agent::{
-        UnsealEncryptedKey, UnsealResult, UnsealStart, UnsealStartResponse, UserAgentRequest,
-        UserAgentResponse, user_agent_request::Payload as UserAgentRequestPayload,
-        user_agent_response::Payload as UserAgentResponsePayload,
-    },
-};
-use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
 use ed25519_dalek::VerifyingKey;
-use kameo::{
-    Actor,
-    error::SendError,
-};
-use memsafe::MemSafe;
-use tokio::select;
+use kameo::{Actor, messages, prelude::Context};
+use tokio::{select, sync::watch};
 use tracing::{error, info};
-use x25519_dalek::{EphemeralSecret, PublicKey};
 
 use crate::actors::{
-    evm::{Generate, ListWallets},
-    keyholder::{self, TryUnseal},
     router::RegisterUserAgent,
-    user_agent::{UserAgentConnection, UserAgentError},
+    user_agent::{
+        Request, Response, TransportResponseError,
+        UserAgentConnection,
+    },
 };
 
 mod state;
-use state::{DummyContext, UnsealContext, UserAgentEvents, UserAgentStateMachine, UserAgentStates};
+use state::{DummyContext, UserAgentEvents, UserAgentStateMachine};
+
+// Error for consumption by other actors
+#[derive(Debug, thiserror::Error, PartialEq)]
+pub enum Error {
+    #[error("User agent session ended due to connection loss")]
+    ConnectionLost,
+
+    #[error("User agent session ended due to unexpected message")]
+    UnexpectedMessage,
+}
 
 pub struct UserAgentSession {
     props: UserAgentConnection,
-    key: VerifyingKey,
     state: UserAgentStateMachine<DummyContext>,
 }
 
+mod connection;
+
 impl UserAgentSession {
-    pub(crate) fn new(props: UserAgentConnection, key: VerifyingKey) -> Self {
+    pub(crate) fn new(props: UserAgentConnection) -> Self {
         Self {
             props,
-            key,
             state: UserAgentStateMachine::new(DummyContext),
         }
     }
 
-    fn transition(&mut self, event: UserAgentEvents) -> Result<(), UserAgentError> {
+    pub(super) async fn send_msg<Reply: kameo::Reply>(
+        &mut self,
+        msg: Response,
+        _ctx: &mut Context<Self, Reply>,
+    ) -> Result<(), Error> {
+        self.props.transport.send(Ok(msg)).await.map_err(|_| {
+            error!(
+                actor = "useragent",
+                reason = "channel closed",
+                "send.failed"
+            );
+            Error::ConnectionLost
+        })
+    }
+
+    async fn expect_msg<Extractor, Msg, Reply>(
+        &mut self,
+        extractor: Extractor,
+        ctx: &mut Context<Self, Reply>,
+    ) -> Result<Msg, Error>
+    where
+        Extractor: FnOnce(Request) -> Option<Msg>,
+        Reply: kameo::Reply,
+    {
+        let msg = self.props.transport.recv().await.ok_or_else(|| {
+            error!(
+                actor = "useragent",
+                reason = "channel closed",
+                "recv.failed"
+            );
+            ctx.stop();
+            Error::ConnectionLost
+        })?;
+
+        extractor(msg).ok_or_else(|| {
+            error!(
+                actor = "useragent",
+                reason = "unexpected message",
+                "recv.failed"
+            );
+            ctx.stop();
+            Error::UnexpectedMessage
+        })
+    }
+
+    fn transition(&mut self, event: UserAgentEvents) -> Result<(), TransportResponseError> {
         self.state.process_event(event).map_err(|e| {
             error!(?e, "State transition failed");
-            UserAgentError::StateTransitionFailed
+            TransportResponseError::StateTransitionFailed
         })?;
         Ok(())
     }
-
-    pub async fn process_transport_inbound(&mut self, req: UserAgentRequest) -> Output {
-        let msg = req.payload.ok_or_else(|| {
-            error!(actor = "useragent", "Received message with no payload");
-            UserAgentError::MissingRequestPayload
-        })?;
-
-        match msg {
-            UserAgentRequestPayload::UnsealStart(unseal_start) => {
-                self.handle_unseal_request(unseal_start).await
-            }
-            UserAgentRequestPayload::UnsealEncryptedKey(unseal_encrypted_key) => {
-                self.handle_unseal_encrypted_key(unseal_encrypted_key).await
-            }
-            UserAgentRequestPayload::EvmWalletCreate(_) => self.handle_evm_wallet_create().await,
-            UserAgentRequestPayload::EvmWalletList(_) => self.handle_evm_wallet_list().await,
-            _ => Err(UserAgentError::UnexpectedRequestPayload),
-        }
-    }
-}
-
-type Output = Result<UserAgentResponse, UserAgentError>;
-
-fn response(payload: UserAgentResponsePayload) -> UserAgentResponse {
-    UserAgentResponse {
-        payload: Some(payload),
-    }
 }
 
+#[messages]
 impl UserAgentSession {
-    async fn handle_unseal_request(&mut self, req: UnsealStart) -> Output {
-        let secret = EphemeralSecret::random();
-        let public_key = PublicKey::from(&secret);
-
-        let client_pubkey_bytes: [u8; 32] = req
-            .client_pubkey
-            .try_into()
-            .map_err(|_| UserAgentError::InvalidClientPubkeyLength)?;
-
-        let client_public_key = PublicKey::from(client_pubkey_bytes);
-
-        self.transition(UserAgentEvents::UnsealRequest(UnsealContext {
-            secret: Mutex::new(Some(secret)),
-            client_public_key,
-        }))?;
-
-        Ok(response(UserAgentResponsePayload::UnsealStartResponse(
-            UnsealStartResponse {
-                server_pubkey: public_key.as_bytes().to_vec(),
+    // TODO: Think about refactoring it to state-machine based flow, as we already have one
+    #[message(ctx)]
+    pub async fn request_new_client_approval(
+        &mut self,
+        client_pubkey: VerifyingKey,
+        mut cancel_flag: watch::Receiver<()>,
+        ctx: &mut Context<Self, Result<bool, Error>>,
+    ) -> Result<bool, Error> {
+        self.send_msg(
+            Response::ClientConnectionRequest {
+                pubkey: client_pubkey,
             },
-        )))
-    }
+            ctx,
+        )
+        .await?;
 
-    async fn handle_unseal_encrypted_key(&mut self, req: UnsealEncryptedKey) -> Output {
-        let UserAgentStates::WaitingForUnsealKey(unseal_context) = self.state.state() else {
-            error!("Received unseal encrypted key in invalid state");
-            return Err(UserAgentError::InvalidStateForUnsealEncryptedKey);
-        };
-        let ephemeral_secret = {
-            let mut secret_lock = unseal_context.secret.lock().unwrap();
-            let secret = secret_lock.take();
-            match secret {
-                Some(secret) => secret,
-                None => {
-                    drop(secret_lock);
-                    error!("Ephemeral secret already taken");
-                    self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                    return Ok(response(UserAgentResponsePayload::UnsealResult(
-                        UnsealResult::InvalidKey.into(),
-                    )));
-                }
+        let extractor = |msg| {
+            if let Request::ClientConnectionResponse { approved } = msg {
+                Some(approved)
+            } else {
+                None
             }
         };
 
-        let nonce = XNonce::from_slice(&req.nonce);
-
-        let shared_secret = ephemeral_secret.diffie_hellman(&unseal_context.client_public_key);
-        let cipher = XChaCha20Poly1305::new(shared_secret.as_bytes().into());
-
-        let mut seal_key_buffer = MemSafe::new(req.ciphertext.clone()).unwrap();
-
-        let decryption_result = {
-            let mut write_handle = seal_key_buffer.write().unwrap();
-            let write_handle = write_handle.deref_mut();
-            cipher.decrypt_in_place(nonce, &req.associated_data, write_handle)
-        };
-
-        match decryption_result {
-            Ok(_) => {
-                match self
-                    .props
-                    .actors
-                    .key_holder
-                    .ask(TryUnseal {
-                        seal_key_raw: seal_key_buffer,
-                    })
-                    .await
-                {
-                    Ok(_) => {
-                        info!("Successfully unsealed key with client-provided key");
-                        self.transition(UserAgentEvents::ReceivedValidKey)?;
-                        Ok(response(UserAgentResponsePayload::UnsealResult(
-                            UnsealResult::Success.into(),
-                        )))
-                    }
-                    Err(SendError::HandlerError(keyholder::Error::InvalidKey)) => {
-                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                        Ok(response(UserAgentResponsePayload::UnsealResult(
-                            UnsealResult::InvalidKey.into(),
-                        )))
-                    }
-                    Err(SendError::HandlerError(err)) => {
-                        error!(?err, "Keyholder failed to unseal key");
-                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                        Ok(response(UserAgentResponsePayload::UnsealResult(
-                            UnsealResult::InvalidKey.into(),
-                        )))
-                    }
-                    Err(err) => {
-                        error!(?err, "Failed to send unseal request to keyholder");
-                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                        Err(UserAgentError::KeyHolderActorUnreachable)
-                    }
-                }
+        tokio::select! {
+            _ = cancel_flag.changed() => {
+                info!(actor = "useragent", "client connection approval cancelled");
+                self.send_msg(
+                    Response::ClientConnectionCancel,
+                    ctx,
+                ).await?;
+                Ok(false)
             }
-            Err(err) => {
-                error!(?err, "Failed to decrypt unseal key");
-                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Ok(response(UserAgentResponsePayload::UnsealResult(
-                    UnsealResult::InvalidKey.into(),
-                )))
+            result = self.expect_msg(extractor, ctx) => {
+                let result = result?;
+                info!(actor = "useragent", "received client connection approval result: approved={}", result);
+                Ok(result)
             }
         }
     }
 }
 
-impl UserAgentSession {
-    async fn handle_evm_wallet_create(&mut self) -> Output {
-        use evm_proto::wallet_create_response::Result as CreateResult;
-
-        let result = match self.props.actors.evm.ask(Generate {}).await {
-            Ok(address) => CreateResult::Wallet(evm_proto::WalletEntry {
-                address: address.as_slice().to_vec(),
-            }),
-            Err(err) => CreateResult::Error(map_evm_error("wallet create", err).into()),
-        };
-
-        Ok(response(UserAgentResponsePayload::EvmWalletCreate(
-            evm_proto::WalletCreateResponse {
-                result: Some(result),
-            },
-        )))
-    }
-
-    async fn handle_evm_wallet_list(&mut self) -> Output {
-        use evm_proto::wallet_list_response::Result as ListResult;
-
-        let result = match self.props.actors.evm.ask(ListWallets {}).await {
-            Ok(wallets) => ListResult::Wallets(evm_proto::WalletList {
-                wallets: wallets
-                    .into_iter()
-                    .map(|addr| evm_proto::WalletEntry {
-                        address: addr.as_slice().to_vec(),
-                    })
-                    .collect(),
-            }),
-            Err(err) => ListResult::Error(map_evm_error("wallet list", err).into()),
-        };
-
-        Ok(response(UserAgentResponsePayload::EvmWalletList(
-            evm_proto::WalletListResponse {
-                result: Some(result),
-            },
-        )))
-    }
-}
-
-fn map_evm_error<M>(op: &str, err: SendError<M, crate::actors::evm::Error>) -> evm_proto::EvmError {
-    use crate::actors::{evm::Error as EvmError, keyholder::Error as KhError};
-    match err {
-        SendError::HandlerError(EvmError::Keyholder(KhError::NotBootstrapped)) => {
-            evm_proto::EvmError::VaultSealed
-        }
-        SendError::HandlerError(err) => {
-            error!(?err, "EVM {op} failed");
-            evm_proto::EvmError::Internal
-        }
-        _ => {
-            error!("EVM actor unreachable during {op}");
-            evm_proto::EvmError::Internal
-        }
-    }
-}
-
 impl Actor for UserAgentSession {
     type Args = Self;
 
-    type Error = UserAgentError;
+    type Error = TransportResponseError;
 
     async fn on_start(
         args: Self::Args,
@@ -263,7 +155,7 @@ impl Actor for UserAgentSession {
             .await
             .map_err(|err| {
                 error!(?err, "Failed to register user agent connection with router");
-                UserAgentError::ConnectionRegistrationFailed
+                TransportResponseError::ConnectionRegistrationFailed
             })?;
         Ok(args)
     }
@@ -310,10 +202,8 @@ impl UserAgentSession {
         use arbiter_proto::transport::DummyTransport;
         let transport: super::Transport = Box::new(DummyTransport::new());
         let props = UserAgentConnection::new(db, actors, transport);
-        let key = VerifyingKey::from_bytes(&[0u8; 32]).unwrap();
         Self {
             props,
-            key,
             state: UserAgentStateMachine::new(DummyContext),
         }
     }

server/crates/arbiter-server/src/actors/user_agent/session/connection.rs

@@ -0,0 +1,355 @@
+use std::sync::Mutex;
+
+use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
+use kameo::error::SendError;
+use tracing::{error, info};
+use x25519_dalek::{EphemeralSecret, PublicKey};
+
+use crate::safe_cell::SafeCell;
+use crate::{
+    actors::{
+        evm::{
+            Generate, ListWallets, UseragentCreateGrant, UseragentDeleteGrant, UseragentListGrants,
+        },
+        keyholder::{self, Bootstrap, TryUnseal},
+        user_agent::{
+            BootstrapError, Request, Response, TransportResponseError, UnsealError, VaultState,
+            session::{
+                UserAgentSession,
+                state::{UnsealContext, UserAgentEvents, UserAgentStates},
+            },
+        },
+    },
+    safe_cell::SafeCellHandle as _,
+};
+
+impl UserAgentSession {
+    pub async fn process_transport_inbound(&mut self, req: Request) -> Output {
+        match req {
+            Request::UnsealStart { client_pubkey } => {
+                self.handle_unseal_request(client_pubkey).await
+            }
+            Request::UnsealEncryptedKey {
+                nonce,
+                ciphertext,
+                associated_data,
+            } => {
+                self.handle_unseal_encrypted_key(nonce, ciphertext, associated_data)
+                    .await
+            }
+            Request::BootstrapEncryptedKey {
+                nonce,
+                ciphertext,
+                associated_data,
+            } => {
+                self.handle_bootstrap_encrypted_key(nonce, ciphertext, associated_data)
+                    .await
+            }
+            Request::ListGrants => self.handle_grant_list().await,
+            Request::QueryVaultState => self.handle_query_vault_state().await,
+            Request::EvmWalletCreate => self.handle_evm_wallet_create().await,
+            Request::EvmWalletList => self.handle_evm_wallet_list().await,
+            Request::AuthChallengeRequest { .. }
+            | Request::AuthChallengeSolution { .. }
+            | Request::ClientConnectionResponse { .. } => {
+                Err(TransportResponseError::UnexpectedRequestPayload)
+            }
+            Request::EvmGrantCreate {
+                client_id,
+                shared,
+                specific,
+            } => self.handle_grant_create(client_id, shared, specific).await,
+            Request::EvmGrantDelete { grant_id } => self.handle_grant_delete(grant_id).await,
+        }
+    }
+}
+
+type Output = Result<Response, TransportResponseError>;
+
+impl UserAgentSession {
+    fn take_unseal_secret(
+        &mut self,
+    ) -> Result<(EphemeralSecret, PublicKey), TransportResponseError> {
+        let UserAgentStates::WaitingForUnsealKey(unseal_context) = self.state.state() else {
+            error!("Received encrypted key in invalid state");
+            return Err(TransportResponseError::InvalidStateForUnsealEncryptedKey);
+        };
+
+        let ephemeral_secret = {
+            #[allow(
+                clippy::unwrap_used,
+                reason = "Mutex poison is unrecoverable and should panic"
+            )]
+            let mut secret_lock = unseal_context.secret.lock().unwrap();
+            let secret = secret_lock.take();
+            match secret {
+                Some(secret) => secret,
+                None => {
+                    drop(secret_lock);
+                    error!("Ephemeral secret already taken");
+                    return Err(TransportResponseError::StateTransitionFailed);
+                }
+            }
+        };
+
+        Ok((ephemeral_secret, unseal_context.client_public_key))
+    }
+
+    fn decrypt_client_key_material(
+        ephemeral_secret: EphemeralSecret,
+        client_public_key: PublicKey,
+        nonce: &[u8],
+        ciphertext: &[u8],
+        associated_data: &[u8],
+    ) -> Result<SafeCell<Vec<u8>>, ()> {
+        let nonce = XNonce::from_slice(nonce);
+
+        let shared_secret = ephemeral_secret.diffie_hellman(&client_public_key);
+        let cipher = XChaCha20Poly1305::new(shared_secret.as_bytes().into());
+
+        let mut key_buffer = SafeCell::new(ciphertext.to_vec());
+
+        let decryption_result = key_buffer.write_inline(|write_handle| {
+            cipher.decrypt_in_place(nonce, associated_data, write_handle)
+        });
+
+        match decryption_result {
+            Ok(_) => Ok(key_buffer),
+            Err(err) => {
+                error!(?err, "Failed to decrypt encrypted key material");
+                Err(())
+            }
+        }
+    }
+
+    async fn handle_unseal_request(&mut self, client_pubkey: x25519_dalek::PublicKey) -> Output {
+        let secret = EphemeralSecret::random();
+        let public_key = PublicKey::from(&secret);
+
+        self.transition(UserAgentEvents::UnsealRequest(UnsealContext {
+            secret: Mutex::new(Some(secret)),
+            client_public_key: client_pubkey,
+        }))?;
+
+        Ok(Response::UnsealStartResponse {
+            server_pubkey: public_key,
+        })
+    }
+
+    async fn handle_unseal_encrypted_key(
+        &mut self,
+        nonce: Vec<u8>,
+        ciphertext: Vec<u8>,
+        associated_data: Vec<u8>,
+    ) -> Output {
+        let (ephemeral_secret, client_public_key) = match self.take_unseal_secret() {
+            Ok(values) => values,
+            Err(TransportResponseError::StateTransitionFailed) => {
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                return Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)));
+            }
+            Err(err) => return Err(err),
+        };
+
+        let seal_key_buffer = match Self::decrypt_client_key_material(
+            ephemeral_secret,
+            client_public_key,
+            &nonce,
+            &ciphertext,
+            &associated_data,
+        ) {
+            Ok(buffer) => buffer,
+            Err(()) => {
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                return Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)));
+            }
+        };
+
+        match self
+            .props
+            .actors
+            .key_holder
+            .ask(TryUnseal {
+                seal_key_raw: seal_key_buffer,
+            })
+            .await
+        {
+            Ok(_) => {
+                info!("Successfully unsealed key with client-provided key");
+                self.transition(UserAgentEvents::ReceivedValidKey)?;
+                Ok(Response::UnsealResult(Ok(())))
+            }
+            Err(SendError::HandlerError(keyholder::Error::InvalidKey)) => {
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)))
+            }
+            Err(SendError::HandlerError(err)) => {
+                error!(?err, "Keyholder failed to unseal key");
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)))
+            }
+            Err(err) => {
+                error!(?err, "Failed to send unseal request to keyholder");
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                Err(TransportResponseError::KeyHolderActorUnreachable)
+            }
+        }
+    }
+
+    async fn handle_bootstrap_encrypted_key(
+        &mut self,
+        nonce: Vec<u8>,
+        ciphertext: Vec<u8>,
+        associated_data: Vec<u8>,
+    ) -> Output {
+        let (ephemeral_secret, client_public_key) = match self.take_unseal_secret() {
+            Ok(values) => values,
+            Err(TransportResponseError::StateTransitionFailed) => {
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                return Ok(Response::BootstrapResult(Err(BootstrapError::InvalidKey)));
+            }
+            Err(err) => return Err(err),
+        };
+
+        let seal_key_buffer = match Self::decrypt_client_key_material(
+            ephemeral_secret,
+            client_public_key,
+            &nonce,
+            &ciphertext,
+            &associated_data,
+        ) {
+            Ok(buffer) => buffer,
+            Err(()) => {
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                return Ok(Response::BootstrapResult(Err(BootstrapError::InvalidKey)));
+            }
+        };
+
+        match self
+            .props
+            .actors
+            .key_holder
+            .ask(Bootstrap {
+                seal_key_raw: seal_key_buffer,
+            })
+            .await
+        {
+            Ok(_) => {
+                info!("Successfully bootstrapped vault with client-provided key");
+                self.transition(UserAgentEvents::ReceivedValidKey)?;
+                Ok(Response::BootstrapResult(Ok(())))
+            }
+            Err(SendError::HandlerError(keyholder::Error::AlreadyBootstrapped)) => {
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                Ok(Response::BootstrapResult(Err(
+                    BootstrapError::AlreadyBootstrapped,
+                )))
+            }
+            Err(SendError::HandlerError(err)) => {
+                error!(?err, "Keyholder failed to bootstrap vault");
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                Ok(Response::BootstrapResult(Err(BootstrapError::InvalidKey)))
+            }
+            Err(err) => {
+                error!(?err, "Failed to send bootstrap request to keyholder");
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                Err(TransportResponseError::KeyHolderActorUnreachable)
+            }
+        }
+    }
+}
+
+impl UserAgentSession {
+    async fn handle_query_vault_state(&mut self) -> Output {
+        use crate::actors::keyholder::{GetState, StateDiscriminants};
+
+        let vault_state = match self.props.actors.key_holder.ask(GetState {}).await {
+            Ok(StateDiscriminants::Unbootstrapped) => VaultState::Unbootstrapped,
+            Ok(StateDiscriminants::Sealed) => VaultState::Sealed,
+            Ok(StateDiscriminants::Unsealed) => VaultState::Unsealed,
+            Err(err) => {
+                error!(?err, actor = "useragent", "keyholder.query.failed");
+                return Err(TransportResponseError::KeyHolderActorUnreachable);
+            }
+        };
+
+        Ok(Response::VaultState(vault_state))
+    }
+}
+
+impl UserAgentSession {
+    async fn handle_evm_wallet_create(&mut self) -> Output {
+        let result = match self.props.actors.evm.ask(Generate {}).await {
+            Ok(_address) => return Ok(Response::EvmWalletCreate(Ok(()))),
+            Err(SendError::HandlerError(err)) => Err(err),
+            Err(err) => {
+                error!(?err, "EVM actor unreachable during wallet create");
+                return Err(TransportResponseError::KeyHolderActorUnreachable);
+            }
+        };
+        Ok(Response::EvmWalletCreate(result))
+    }
+
+    async fn handle_evm_wallet_list(&mut self) -> Output {
+        match self.props.actors.evm.ask(ListWallets {}).await {
+            Ok(wallets) => Ok(Response::EvmWalletList(wallets)),
+            Err(err) => {
+                error!(?err, "EVM wallet list failed");
+                Err(TransportResponseError::KeyHolderActorUnreachable)
+            }
+        }
+    }
+}
+
+impl UserAgentSession {
+    async fn handle_grant_list(&mut self) -> Output {
+        match self.props.actors.evm.ask(UseragentListGrants {}).await {
+            Ok(grants) => Ok(Response::ListGrants(grants)),
+            Err(err) => {
+                error!(?err, "EVM grant list failed");
+                Err(TransportResponseError::KeyHolderActorUnreachable)
+            }
+        }
+    }
+
+    async fn handle_grant_create(
+        &mut self,
+        client_id: i32,
+        basic: crate::evm::policies::SharedGrantSettings,
+        grant: crate::evm::policies::SpecificGrant,
+    ) -> Output {
+        match self
+            .props
+            .actors
+            .evm
+            .ask(UseragentCreateGrant {
+                client_id,
+                basic,
+                grant,
+            })
+            .await
+        {
+            Ok(grant_id) => Ok(Response::EvmGrantCreate(Ok(grant_id))),
+            Err(err) => {
+                error!(?err, "EVM grant create failed");
+                Err(TransportResponseError::KeyHolderActorUnreachable)
+            }
+        }
+    }
+
+    async fn handle_grant_delete(&mut self, grant_id: i32) -> Output {
+        match self
+            .props
+            .actors
+            .evm
+            .ask(UseragentDeleteGrant { grant_id })
+            .await
+        {
+            Ok(()) => Ok(Response::EvmGrantDelete(Ok(()))),
+            Err(err) => {
+                error!(?err, "EVM grant delete failed");
+                Err(TransportResponseError::KeyHolderActorUnreachable)
+            }
+        }
+    }
+}

server/crates/arbiter-server/src/context/tls.rs

@@ -8,7 +8,7 @@ use rcgen::{
     BasicConstraints, Certificate, CertificateParams, CertifiedIssuer, DistinguishedName, DnType,
     IsCa, Issuer, KeyPair, KeyUsagePurpose,
 };
-use rustls::pki_types::{pem::PemObject};
+use rustls::pki_types::pem::PemObject;
 use thiserror::Error;
 use tonic::transport::CertificateDer;
 
@@ -59,10 +59,7 @@ pub enum InitError {
 pub type PemCert = String;
 
 pub fn encode_cert_to_pem(cert: &CertificateDer) -> PemCert {
-    pem::encode_config(
-        &Pem::new("CERTIFICATE", cert.to_vec()),
-        ENCODE_CONFIG,
-    )
+    pem::encode_config(&Pem::new("CERTIFICATE", cert.to_vec()), ENCODE_CONFIG)
 }
 
 #[allow(unused)]
@@ -94,6 +91,10 @@ impl TlsCa {
 
         let cert_key_pem = certified_issuer.key().serialize_pem();
 
+        #[allow(
+            clippy::unwrap_used,
+            reason = "Broken cert couldn't bootstrap server anyway"
+        )]
         let issuer = Issuer::from_ca_cert_pem(
             &certified_issuer.pem(),
             KeyPair::from_pem(cert_key_pem.as_ref()).unwrap(),

server/crates/arbiter-server/src/db/mod.rs

@@ -92,6 +92,7 @@ fn initialize_database(url: &str) -> Result<(), DatabaseSetupError> {
 #[tracing::instrument(level = "info")]
 pub async fn create_pool(url: Option<&str>) -> Result<DatabasePool, DatabaseSetupError> {
     let database_url = url.map(String::from).unwrap_or(
+        #[allow(clippy::expect_used)]
         database_path()?
             .to_str()
             .expect("database path is not valid UTF-8")
@@ -135,11 +136,13 @@ pub async fn create_test_pool() -> DatabasePool {
     let tempfile_name = Alphanumeric.sample_string(&mut rand::rng(), 16);
 
     let file = std::env::temp_dir().join(tempfile_name);
-    let url = format!(
-        "{}?mode=rwc",
-        file.to_str().expect("temp file path is not valid UTF-8")
-    );
+    #[allow(clippy::expect_used)]
+    let url = file
+        .to_str()
+        .expect("temp file path is not valid UTF-8")
+        .to_string();
 
+    #[allow(clippy::expect_used)]
     create_pool(Some(&url))
         .await
         .expect("Failed to create test database pool")

server/crates/arbiter-server/src/db/models.rs

@@ -2,15 +2,16 @@
 #![allow(clippy::all)]
 
 use crate::db::schema::{
-    self, aead_encrypted, arbiter_settings, evm_basic_grant, evm_ether_transfer_grant, evm_ether_transfer_grant_target, evm_ether_transfer_limit, evm_token_transfer_grant, evm_token_transfer_log, evm_token_transfer_volume_limit, evm_transaction_log, evm_wallet, root_key_history, tls_history
+    self, aead_encrypted, arbiter_settings, evm_basic_grant, evm_ether_transfer_grant,
+    evm_ether_transfer_grant_target, evm_ether_transfer_limit, evm_token_transfer_grant,
+    evm_token_transfer_log, evm_token_transfer_volume_limit, evm_transaction_log, evm_wallet,
+    root_key_history, tls_history,
 };
 use chrono::{DateTime, Utc};
 use diesel::{prelude::*, sqlite::Sqlite};
 use restructed::Models;
 
 pub mod types {
-    use std::os::unix;
-
     use chrono::{DateTime, Utc};
     use diesel::{
         deserialize::{FromSql, FromSqlRow},
@@ -35,9 +36,9 @@ pub mod types {
             SqliteTimestamp(dt)
         }
     }
-    impl Into<chrono::DateTime<Utc>> for SqliteTimestamp {
-        fn into(self) -> chrono::DateTime<Utc> {
-            self.0
+    impl From<SqliteTimestamp> for chrono::DateTime<Utc> {
+        fn from(ts: SqliteTimestamp) -> Self {
+            ts.0
         }
     }
 
@@ -65,12 +66,46 @@ pub mod types {
             };
 
             let unix_timestamp = bytes.read_long();
-            let datetime = DateTime::from_timestamp(unix_timestamp, 0)
-                .ok_or("Timestamp is out of bounds")?;
+            let datetime =
+                DateTime::from_timestamp(unix_timestamp, 0).ok_or("Timestamp is out of bounds")?;
 
             Ok(SqliteTimestamp(datetime))
         }
     }
+
+    /// Key algorithm stored in the `useragent_client.key_type` column.
+    /// Values must stay stable — they are persisted in the database.
+    #[derive(Debug, Clone, Copy, PartialEq, Eq, FromSqlRow, AsExpression, strum::FromRepr)]
+    #[diesel(sql_type = Integer)]
+    #[repr(i32)]
+    pub enum KeyType {
+        Ed25519 = 1,
+        EcdsaSecp256k1 = 2,
+        Rsa = 3,
+    }
+
+    impl ToSql<Integer, Sqlite> for KeyType {
+        fn to_sql<'b>(
+            &'b self,
+            out: &mut diesel::serialize::Output<'b, '_, Sqlite>,
+        ) -> diesel::serialize::Result {
+            out.set_value(*self as i32);
+            Ok(IsNull::No)
+        }
+    }
+
+    impl FromSql<Integer, Sqlite> for KeyType {
+        fn from_sql(
+            mut bytes: <Sqlite as diesel::backend::Backend>::RawValue<'_>,
+        ) -> diesel::deserialize::Result<Self> {
+            let Some(SqliteType::Long) = bytes.value_type() else {
+                return Err("Expected Integer for KeyType".into());
+            };
+            let discriminant = bytes.read_long();
+            KeyType::from_repr(discriminant as i32)
+                .ok_or_else(|| format!("Unknown KeyType discriminant: {discriminant}").into())
+        }
+    }
 }
 pub use types::*;
 
@@ -150,7 +185,7 @@ pub struct EvmWallet {
     pub created_at: SqliteTimestamp,
 }
 
-#[derive(Queryable, Debug)]
+#[derive(Queryable, Debug, Insertable, Selectable)]
 #[diesel(table_name = schema::program_client, check_for_backend(Sqlite))]
 pub struct ProgramClient {
     pub id: i32,
@@ -168,6 +203,7 @@ pub struct UseragentClient {
     pub public_key: Vec<u8>,
     pub created_at: SqliteTimestamp,
     pub updated_at: SqliteTimestamp,
+    pub key_type: KeyType,
 }
 
 #[derive(Models, Queryable, Debug, Insertable, Selectable)]
@@ -253,7 +289,6 @@ pub struct EvmEtherTransferGrantTarget {
     pub address: Vec<u8>,
 }
 
-
 #[derive(Models, Queryable, Debug, Insertable, Selectable)]
 #[diesel(table_name = evm_token_transfer_grant, check_for_backend(Sqlite))]
 #[view(

server/crates/arbiter-server/src/db/schema.rs

@@ -153,6 +153,7 @@ diesel::table! {
         public_key -> Binary,
         created_at -> Integer,
         updated_at -> Integer,
+        key_type -> Integer,
     }
 }
 

server/crates/arbiter-server/src/evm/mod.rs

@@ -117,18 +117,17 @@ async fn check_shared_constraints(
     let now = Utc::now();
 
     // Validity window
-    if shared.valid_from.map_or(false, |t| now < t) || shared.valid_until.map_or(false, |t| now > t)
-    {
+    if shared.valid_from.is_some_and(|t| now < t) || shared.valid_until.is_some_and(|t| now > t) {
         violations.push(EvalViolation::InvalidTime);
     }
 
     // Gas fee caps
     let fee_exceeded = shared
         .max_gas_fee_per_gas
-        .map_or(false, |cap| U256::from(context.max_fee_per_gas) > cap);
-    let priority_exceeded = shared.max_priority_fee_per_gas.map_or(false, |cap| {
-        U256::from(context.max_priority_fee_per_gas) > cap
-    });
+        .is_some_and(|cap| U256::from(context.max_fee_per_gas) > cap);
+    let priority_exceeded = shared
+        .max_priority_fee_per_gas
+        .is_some_and(|cap| U256::from(context.max_priority_fee_per_gas) > cap);
     if fee_exceeded || priority_exceeded {
         violations.push(EvalViolation::GasLimitExceeded {
             max_gas_fee_per_gas: shared.max_gas_fee_per_gas,
@@ -228,7 +227,7 @@ impl Engine {
                         .values(&NewEvmBasicGrant {
                             wallet_id: full_grant.basic.wallet_id,
                             chain_id: full_grant.basic.chain as i32,
-                            client_id: client_id,
+                            client_id,
                             valid_from: full_grant.basic.valid_from.map(SqliteTimestamp),
                             valid_until: full_grant.basic.valid_until.map(SqliteTimestamp),
                             max_gas_fee_per_gas: full_grant

server/crates/arbiter-server/src/evm/policies.rs

@@ -66,6 +66,7 @@ pub enum EvalViolation {
 
 pub type DatabaseID = i32;
 
+#[derive(Debug)]
 pub struct Grant<PolicySettings> {
     pub id: DatabaseID,
     pub shared_grant_id: DatabaseID, // ID of the basic grant for shared-logic checks like rate limits and validity periods
@@ -73,7 +74,6 @@ pub struct Grant<PolicySettings> {
     pub settings: PolicySettings,
 }
 
-
 pub trait Policy: Sized {
     type Settings: Send + Sync + 'static + Into<SpecificGrant>;
     type Meaning: Display + std::fmt::Debug + Send + Sync + 'static + Into<SpecificMeaning>;
@@ -146,6 +146,7 @@ pub struct VolumeRateLimit {
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct SharedGrantSettings {
     pub wallet_id: i32,
+    pub client_id: i32,
     pub chain: ChainId,
 
     pub valid_from: Option<DateTime<Utc>>,
@@ -161,6 +162,7 @@ impl SharedGrantSettings {
     fn try_from_model(model: EvmBasicGrant) -> QueryResult<Self> {
         Ok(Self {
             wallet_id: model.wallet_id,
+            client_id: model.client_id,
             chain: model.chain_id as u64, // safe because chain_id is stored as i32 but is guaranteed to be a valid ChainId by the API when creating grants
             valid_from: model.valid_from.map(Into::into),
             valid_until: model.valid_until.map(Into::into),
@@ -198,6 +200,7 @@ impl SharedGrantSettings {
     }
 }
 
+#[derive(Debug, Clone)]
 pub enum SpecificGrant {
     EtherTransfer(ether_transfer::Settings),
     TokenTransfer(token_transfers::Settings),

server/crates/arbiter-server/src/evm/policies/ether_transfer/mod.rs

@@ -41,29 +41,25 @@ pub struct Meaning {
 }
 impl Display for Meaning {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(
-            f,
-            "Ether transfer of {} to {}",
-            self.value,
-            self.to.to_string()
-        )
+        write!(f, "Ether transfer of {} to {}", self.value, self.to)
     }
 }
-impl Into<SpecificMeaning> for Meaning {
-    fn into(self) -> SpecificMeaning {
-        SpecificMeaning::EtherTransfer(self)
+impl From<Meaning> for SpecificMeaning {
+    fn from(val: Meaning) -> SpecificMeaning {
+        SpecificMeaning::EtherTransfer(val)
     }
 }
 
 // A grant for ether transfers, which can be scoped to specific target addresses and volume limits
+#[derive(Debug, Clone)]
 pub struct Settings {
-    target: Vec<Address>,
-    limit: VolumeRateLimit,
+    pub target: Vec<Address>,
+    pub limit: VolumeRateLimit,
 }
 
-impl Into<SpecificGrant> for Settings {
-    fn into(self) -> SpecificGrant {
-        SpecificGrant::EtherTransfer(self)
+impl From<Settings> for SpecificGrant {
+    fn from(val: Settings) -> SpecificGrant {
+        SpecificGrant::EtherTransfer(val)
     }
 }
 

server/crates/arbiter-server/src/evm/policies/ether_transfer/tests.rs

@@ -9,9 +9,7 @@ use crate::db::{
     schema::{evm_basic_grant, evm_transaction_log},
 };
 use crate::evm::{
-    policies::{
-        EvalContext, EvalViolation, Grant, Policy, SharedGrantSettings, VolumeRateLimit,
-    },
+    policies::{EvalContext, EvalViolation, Grant, Policy, SharedGrantSettings, VolumeRateLimit},
     utils,
 };
 
@@ -76,6 +74,7 @@ fn shared() -> SharedGrantSettings {
         max_gas_fee_per_gas: None,
         max_priority_fee_per_gas: None,
         rate_limit: None,
+        client_id: CLIENT_ID,
     }
 }
 

server/crates/arbiter-server/src/evm/policies/token_transfers/mod.rs

@@ -51,21 +51,22 @@ impl std::fmt::Display for Meaning {
         )
     }
 }
-impl Into<SpecificMeaning> for Meaning {
-    fn into(self) -> SpecificMeaning {
-        SpecificMeaning::TokenTransfer(self)
+impl From<Meaning> for SpecificMeaning {
+    fn from(val: Meaning) -> SpecificMeaning {
+        SpecificMeaning::TokenTransfer(val)
     }
 }
 
 // A grant for token transfers, which can be scoped to specific target addresses and volume limits
+#[derive(Debug, Clone)]
 pub struct Settings {
-    token_contract: Address,
-    target: Option<Address>,
-    volume_limits: Vec<VolumeRateLimit>,
+    pub token_contract: Address,
+    pub target: Option<Address>,
+    pub volume_limits: Vec<VolumeRateLimit>,
 }
-impl Into<SpecificGrant> for Settings {
-    fn into(self) -> SpecificGrant {
-        SpecificGrant::TokenTransfer(self)
+impl From<Settings> for SpecificGrant {
+    fn from(val: Settings) -> SpecificGrant {
+        SpecificGrant::TokenTransfer(val)
     }
 }
 
@@ -156,10 +157,10 @@ impl Policy for TokenTransfer {
             return Ok(violations);
         }
 
-        if let Some(allowed) = grant.settings.target {
-            if allowed != meaning.to {
-                violations.push(EvalViolation::InvalidTarget { target: meaning.to });
-            }
+        if let Some(allowed) = grant.settings.target
+            && allowed != meaning.to
+        {
+            violations.push(EvalViolation::InvalidTarget { target: meaning.to });
         }
 
         let rate_violations = check_volume_rate_limits(grant, db).await?;

server/crates/arbiter-server/src/evm/policies/token_transfers/tests.rs

@@ -93,6 +93,7 @@ fn shared() -> SharedGrantSettings {
         max_gas_fee_per_gas: None,
         max_priority_fee_per_gas: None,
         rate_limit: None,
+        client_id: CLIENT_ID,
     }
 }
 
@@ -140,10 +141,18 @@ async fn evaluate_rejects_nonzero_eth_value() {
     let mut context = ctx(DAI, calldata);
     context.value = U256::from(1u64); // ETH attached to an ERC-20 call
 
-    let m = TokenTransfer::analyze(&EvalContext { value: U256::ZERO, ..context.clone() })
+    let m = TokenTransfer::analyze(&EvalContext {
+        value: U256::ZERO,
+        ..context.clone()
+    })
+    .unwrap();
+    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)
+        .await
         .unwrap();
-    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn).await.unwrap();
-    assert!(v.iter().any(|e| matches!(e, EvalViolation::InvalidTransactionType)));
+    assert!(
+        v.iter()
+            .any(|e| matches!(e, EvalViolation::InvalidTransactionType))
+    );
 }
 
 #[tokio::test]
@@ -160,7 +169,9 @@ async fn evaluate_passes_any_recipient_when_no_restriction() {
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let context = ctx(DAI, calldata);
     let m = TokenTransfer::analyze(&context).unwrap();
-    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn).await.unwrap();
+    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)
+        .await
+        .unwrap();
     assert!(v.is_empty());
 }
 
@@ -178,7 +189,9 @@ async fn evaluate_passes_matching_restricted_recipient() {
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let context = ctx(DAI, calldata);
     let m = TokenTransfer::analyze(&context).unwrap();
-    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn).await.unwrap();
+    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)
+        .await
+        .unwrap();
     assert!(v.is_empty());
 }
 
@@ -196,8 +209,13 @@ async fn evaluate_rejects_wrong_restricted_recipient() {
     let calldata = transfer_calldata(OTHER, U256::from(100u64));
     let context = ctx(DAI, calldata);
     let m = TokenTransfer::analyze(&context).unwrap();
-    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn).await.unwrap();
-    assert!(v.iter().any(|e| matches!(e, EvalViolation::InvalidTarget { .. })));
+    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)
+        .await
+        .unwrap();
+    assert!(
+        v.iter()
+            .any(|e| matches!(e, EvalViolation::InvalidTarget { .. }))
+    );
 }
 
 #[tokio::test]
@@ -207,7 +225,9 @@ async fn evaluate_passes_volume_within_limit() {
 
     let basic = insert_basic(&mut conn, false).await;
     let settings = make_settings(None, Some(1_000));
-    let grant_id = TokenTransfer::create_grant(&basic, &settings, &mut *conn).await.unwrap();
+    let grant_id = TokenTransfer::create_grant(&basic, &settings, &mut *conn)
+        .await
+        .unwrap();
 
     // Record a past transfer of 500 (within 1000 limit)
     use crate::db::{models::NewEvmTokenTransferLog, schema::evm_token_transfer_log};
@@ -224,12 +244,22 @@ async fn evaluate_passes_volume_within_limit() {
         .await
         .unwrap();
 
-    let grant = Grant { id: grant_id, shared_grant_id: basic.id, shared: shared(), settings };
+    let grant = Grant {
+        id: grant_id,
+        shared_grant_id: basic.id,
+        shared: shared(),
+        settings,
+    };
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let context = ctx(DAI, calldata);
     let m = TokenTransfer::analyze(&context).unwrap();
-    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn).await.unwrap();
-    assert!(!v.iter().any(|e| matches!(e, EvalViolation::VolumetricLimitExceeded)));
+    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)
+        .await
+        .unwrap();
+    assert!(
+        !v.iter()
+            .any(|e| matches!(e, EvalViolation::VolumetricLimitExceeded))
+    );
 }
 
 #[tokio::test]
@@ -239,7 +269,9 @@ async fn evaluate_rejects_volume_over_limit() {
 
     let basic = insert_basic(&mut conn, false).await;
     let settings = make_settings(None, Some(1_000));
-    let grant_id = TokenTransfer::create_grant(&basic, &settings, &mut *conn).await.unwrap();
+    let grant_id = TokenTransfer::create_grant(&basic, &settings, &mut *conn)
+        .await
+        .unwrap();
 
     use crate::db::{models::NewEvmTokenTransferLog, schema::evm_token_transfer_log};
     insert_into(evm_token_transfer_log::table)
@@ -255,12 +287,22 @@ async fn evaluate_rejects_volume_over_limit() {
         .await
         .unwrap();
 
-    let grant = Grant { id: grant_id, shared_grant_id: basic.id, shared: shared(), settings };
+    let grant = Grant {
+        id: grant_id,
+        shared_grant_id: basic.id,
+        shared: shared(),
+        settings,
+    };
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let context = ctx(DAI, calldata);
     let m = TokenTransfer::analyze(&context).unwrap();
-    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn).await.unwrap();
-    assert!(v.iter().any(|e| matches!(e, EvalViolation::VolumetricLimitExceeded)));
+    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)
+        .await
+        .unwrap();
+    assert!(
+        v.iter()
+            .any(|e| matches!(e, EvalViolation::VolumetricLimitExceeded))
+    );
 }
 
 #[tokio::test]
@@ -277,8 +319,13 @@ async fn evaluate_no_volume_limits_always_passes() {
     let calldata = transfer_calldata(RECIPIENT, U256::from(u64::MAX));
     let context = ctx(DAI, calldata);
     let m = TokenTransfer::analyze(&context).unwrap();
-    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn).await.unwrap();
-    assert!(!v.iter().any(|e| matches!(e, EvalViolation::VolumetricLimitExceeded)));
+    let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)
+        .await
+        .unwrap();
+    assert!(
+        !v.iter()
+            .any(|e| matches!(e, EvalViolation::VolumetricLimitExceeded))
+    );
 }
 
 // ── try_find_grant ───────────────────────────────────────────────────────
@@ -290,7 +337,9 @@ async fn try_find_grant_roundtrip() {
 
     let basic = insert_basic(&mut conn, false).await;
     let settings = make_settings(Some(RECIPIENT), Some(5_000));
-    TokenTransfer::create_grant(&basic, &settings, &mut *conn).await.unwrap();
+    TokenTransfer::create_grant(&basic, &settings, &mut *conn)
+        .await
+        .unwrap();
 
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let found = TokenTransfer::try_find_grant(&ctx(DAI, calldata), &mut *conn)
@@ -312,7 +361,9 @@ async fn try_find_grant_revoked_returns_none() {
 
     let basic = insert_basic(&mut conn, true).await;
     let settings = make_settings(None, None);
-    TokenTransfer::create_grant(&basic, &settings, &mut *conn).await.unwrap();
+    TokenTransfer::create_grant(&basic, &settings, &mut *conn)
+        .await
+        .unwrap();
 
     let calldata = transfer_calldata(RECIPIENT, U256::from(1u64));
     let found = TokenTransfer::try_find_grant(&ctx(DAI, calldata), &mut *conn)
@@ -328,7 +379,9 @@ async fn try_find_grant_unknown_token_returns_none() {
 
     let basic = insert_basic(&mut conn, false).await;
     let settings = make_settings(None, None);
-    TokenTransfer::create_grant(&basic, &settings, &mut *conn).await.unwrap();
+    TokenTransfer::create_grant(&basic, &settings, &mut *conn)
+        .await
+        .unwrap();
 
     // Query with a different token contract
     let calldata = transfer_calldata(RECIPIENT, U256::from(1u64));
@@ -355,9 +408,13 @@ async fn find_all_grants_excludes_revoked() {
 
     let settings = make_settings(None, Some(1_000));
     let active = insert_basic(&mut conn, false).await;
-    TokenTransfer::create_grant(&active, &settings, &mut *conn).await.unwrap();
+    TokenTransfer::create_grant(&active, &settings, &mut *conn)
+        .await
+        .unwrap();
     let revoked = insert_basic(&mut conn, true).await;
-    TokenTransfer::create_grant(&revoked, &settings, &mut *conn).await.unwrap();
+    TokenTransfer::create_grant(&revoked, &settings, &mut *conn)
+        .await
+        .unwrap();
 
     let all = TokenTransfer::find_all_grants(&mut *conn).await.unwrap();
     assert_eq!(all.len(), 1);
@@ -370,12 +427,17 @@ async fn find_all_grants_loads_volume_limits() {
 
     let basic = insert_basic(&mut conn, false).await;
     let settings = make_settings(None, Some(9_999));
-    TokenTransfer::create_grant(&basic, &settings, &mut *conn).await.unwrap();
+    TokenTransfer::create_grant(&basic, &settings, &mut *conn)
+        .await
+        .unwrap();
 
     let all = TokenTransfer::find_all_grants(&mut *conn).await.unwrap();
     assert_eq!(all.len(), 1);
     assert_eq!(all[0].settings.volume_limits.len(), 1);
-    assert_eq!(all[0].settings.volume_limits[0].max_volume, U256::from(9_999u64));
+    assert_eq!(
+        all[0].settings.volume_limits[0].max_volume,
+        U256::from(9_999u64)
+    );
 }
 
 #[tokio::test]
@@ -388,9 +450,13 @@ async fn find_all_grants_multiple_grants_batch_loaded() {
         .await
         .unwrap();
     let b2 = insert_basic(&mut conn, false).await;
-    TokenTransfer::create_grant(&b2, &make_settings(Some(RECIPIENT), Some(2_000)), &mut *conn)
-        .await
-        .unwrap();
+    TokenTransfer::create_grant(
+        &b2,
+        &make_settings(Some(RECIPIENT), Some(2_000)),
+        &mut *conn,
+    )
+    .await
+    .unwrap();
 
     let all = TokenTransfer::find_all_grants(&mut *conn).await.unwrap();
     assert_eq!(all.len(), 2);

server/crates/arbiter-server/src/evm/safe_signer.rs

@@ -1,14 +1,14 @@
 use std::sync::Mutex;
 
+use crate::safe_cell::{SafeCell, SafeCellHandle as _};
 use alloy::{
     consensus::SignableTransaction,
     network::{TxSigner, TxSignerSync},
-    primitives::{Address, ChainId, Signature, B256},
+    primitives::{Address, B256, ChainId, Signature},
     signers::{Error, Result, Signer, SignerSync, utils::secret_key_to_address},
 };
 use async_trait::async_trait;
-use k256::ecdsa::{self, signature::hazmat::PrehashSigner, RecoveryId, SigningKey};
-use memsafe::MemSafe;
+use k256::ecdsa::{self, RecoveryId, SigningKey, signature::hazmat::PrehashSigner};
 
 /// An Ethereum signer that stores its secp256k1 secret key inside a
 /// hardware-protected [`MemSafe`] cell.
@@ -20,7 +20,7 @@ use memsafe::MemSafe;
 /// Because [`MemSafe::read`] requires `&mut self` while the [`Signer`] trait
 /// requires `&self`, the cell is wrapped in a [`Mutex`].
 pub struct SafeSigner {
-    key: Mutex<MemSafe<SigningKey>>,
+    key: Mutex<SafeCell<SigningKey>>,
     address: Address,
     chain_id: Option<ChainId>,
 }
@@ -42,14 +42,13 @@ impl std::fmt::Debug for SafeSigner {
 /// rejection, but we retry to be correct).
 ///
 /// Returns the protected key bytes and the derived Ethereum address.
-pub fn generate(rng: &mut impl rand::Rng) -> (MemSafe<[u8; 32]>, Address) {
+pub fn generate(rng: &mut impl rand::Rng) -> (SafeCell<[u8; 32]>, Address) {
     loop {
-        let mut cell = MemSafe::new([0u8; 32]).expect("MemSafe allocation");
-        {
-            let mut w = cell.write().expect("MemSafe write");
-            rng.fill_bytes(w.as_mut());
-        }
-        let reader = cell.read().expect("MemSafe read");
+        let mut cell = SafeCell::new_inline(|w: &mut [u8; 32]| {
+            rng.fill_bytes(w);
+        });
+
+        let reader = cell.read();
         if let Ok(sk) = SigningKey::from_slice(reader.as_ref()) {
             let address = secret_key_to_address(&sk);
             drop(reader);
@@ -64,8 +63,8 @@ impl SafeSigner {
     /// The key bytes are read from protected memory, parsed as a secp256k1
     /// scalar, and immediately moved into a new [`MemSafe`] cell. The raw
     /// bytes are never exposed outside this function.
-    pub fn from_memsafe(mut cell: MemSafe<Vec<u8>>) -> Result<Self> {
-        let reader = cell.read().map_err(Error::other)?;
+    pub fn from_cell(mut cell: SafeCell<Vec<u8>>) -> Result<Self> {
+        let reader = cell.read();
         let sk = SigningKey::from_slice(reader.as_slice()).map_err(Error::other)?;
         drop(reader);
         Self::new(sk)
@@ -75,7 +74,7 @@ impl SafeSigner {
     /// memory region.
     pub fn new(key: SigningKey) -> Result<Self> {
         let address = secret_key_to_address(&key);
-        let cell = MemSafe::new(key).map_err(Error::other)?;
+        let cell = SafeCell::new(key);
         Ok(Self {
             key: Mutex::new(cell),
             address,
@@ -84,25 +83,25 @@ impl SafeSigner {
     }
 
     fn sign_hash_inner(&self, hash: &B256) -> Result<Signature> {
+        #[allow(clippy::expect_used)]
         let mut cell = self.key.lock().expect("SafeSigner mutex poisoned");
-        let reader = cell.read().map_err(Error::other)?;
+        let reader = cell.read();
         let sig: (ecdsa::Signature, RecoveryId) = reader.sign_prehash(hash.as_ref())?;
         Ok(sig.into())
     }
 
-    fn sign_tx_inner(
-        &self,
-        tx: &mut dyn SignableTransaction<Signature>,
-    ) -> Result<Signature> {
-        if let Some(chain_id) = self.chain_id {
-            if !tx.set_chain_id_checked(chain_id) {
-                return Err(Error::TransactionChainIdMismatch {
-                    signer: chain_id,
-                    tx: tx.chain_id().unwrap(),
-                });
-            }
+    fn sign_tx_inner(&self, tx: &mut dyn SignableTransaction<Signature>) -> Result<Signature> {
+        if let Some(chain_id) = self.chain_id
+            && !tx.set_chain_id_checked(chain_id)
+        {
+            return Err(Error::TransactionChainIdMismatch {
+                signer: chain_id,
+                #[allow(clippy::expect_used)]
+                tx: tx.chain_id().expect("Chain ID is guaranteed to be set"),
+            });
         }
-        self.sign_hash_inner(&tx.signature_hash()).map_err(Error::other)
+        self.sign_hash_inner(&tx.signature_hash())
+            .map_err(Error::other)
     }
 }
 

server/crates/arbiter-server/src/grpc/client.rs

@@ -0,0 +1,137 @@
+use arbiter_proto::{
+    proto::client::{
+        AuthChallenge as ProtoAuthChallenge,
+        AuthChallengeRequest as ProtoAuthChallengeRequest,
+        AuthChallengeSolution as ProtoAuthChallengeSolution, AuthOk as ProtoAuthOk,
+        ClientConnectError, ClientRequest, ClientResponse,
+        client_connect_error::Code as ProtoClientConnectErrorCode,
+        client_request::Payload as ClientRequestPayload,
+        client_response::Payload as ClientResponsePayload,
+    },
+    transport::{Bi, Error as TransportError},
+};
+use async_trait::async_trait;
+use futures::StreamExt as _;
+use tokio::sync::mpsc;
+use tonic::{Status, Streaming};
+
+use crate::actors::client::{
+    self, ClientError, ConnectErrorCode, Request as DomainRequest, Response as DomainResponse,
+};
+
+pub struct GrpcTransport {
+    sender: mpsc::Sender<Result<ClientResponse, Status>>,
+    receiver: Streaming<ClientRequest>,
+}
+
+impl GrpcTransport {
+    pub fn new(
+        sender: mpsc::Sender<Result<ClientResponse, Status>>,
+        receiver: Streaming<ClientRequest>,
+    ) -> Self {
+        Self { sender, receiver }
+    }
+
+    fn request_to_domain(request: ClientRequest) -> Result<DomainRequest, Status> {
+        match request.payload {
+            Some(ClientRequestPayload::AuthChallengeRequest(ProtoAuthChallengeRequest {
+                pubkey,
+            })) => Ok(DomainRequest::AuthChallengeRequest { pubkey }),
+            Some(ClientRequestPayload::AuthChallengeSolution(
+                ProtoAuthChallengeSolution { signature },
+            )) => Ok(DomainRequest::AuthChallengeSolution { signature }),
+            None => Err(Status::invalid_argument("Missing client request payload")),
+        }
+    }
+
+    fn response_to_proto(response: DomainResponse) -> ClientResponse {
+        let payload = match response {
+            DomainResponse::AuthChallenge { pubkey, nonce } => {
+                ClientResponsePayload::AuthChallenge(ProtoAuthChallenge { pubkey, nonce })
+            }
+            DomainResponse::AuthOk => ClientResponsePayload::AuthOk(ProtoAuthOk {}),
+            DomainResponse::ClientConnectError { code } => {
+                ClientResponsePayload::ClientConnectError(ClientConnectError {
+                    code: match code {
+                        ConnectErrorCode::Unknown => ProtoClientConnectErrorCode::Unknown,
+                        ConnectErrorCode::ApprovalDenied => {
+                            ProtoClientConnectErrorCode::ApprovalDenied
+                        }
+                        ConnectErrorCode::NoUserAgentsOnline => {
+                            ProtoClientConnectErrorCode::NoUserAgentsOnline
+                        }
+                    }
+                    .into(),
+                })
+            }
+        };
+
+        ClientResponse {
+            payload: Some(payload),
+        }
+    }
+
+    fn error_to_status(value: ClientError) -> Status {
+        match value {
+            ClientError::MissingRequestPayload | ClientError::UnexpectedRequestPayload => {
+                Status::invalid_argument("Expected message with payload")
+            }
+            ClientError::StateTransitionFailed => Status::internal("State machine error"),
+            ClientError::Auth(ref err) => auth_error_status(err),
+            ClientError::ConnectionRegistrationFailed => {
+                Status::internal("Connection registration failed")
+            }
+        }
+    }
+}
+
+#[async_trait]
+impl Bi<DomainRequest, Result<DomainResponse, ClientError>> for GrpcTransport {
+    async fn send(&mut self, item: Result<DomainResponse, ClientError>) -> Result<(), TransportError> {
+        let outbound = match item {
+            Ok(message) => Ok(Self::response_to_proto(message)),
+            Err(err) => Err(Self::error_to_status(err)),
+        };
+
+        self.sender
+            .send(outbound)
+            .await
+            .map_err(|_| TransportError::ChannelClosed)
+    }
+
+    async fn recv(&mut self) -> Option<DomainRequest> {
+        match self.receiver.next().await {
+            Some(Ok(item)) => match Self::request_to_domain(item) {
+                Ok(request) => Some(request),
+                Err(status) => {
+                    let _ = self.sender.send(Err(status)).await;
+                    None
+                }
+            },
+            Some(Err(error)) => {
+                tracing::error!(error = ?error, "grpc client recv failed; closing stream");
+                None
+            }
+            None => None,
+        }
+    }
+}
+
+fn auth_error_status(value: &client::auth::Error) -> Status {
+    use client::auth::Error;
+
+    match value {
+        Error::UnexpectedMessagePayload | Error::InvalidClientPubkeyLength => {
+            Status::invalid_argument(value.to_string())
+        }
+        Error::InvalidAuthPubkeyEncoding => {
+            Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
+        }
+        Error::InvalidChallengeSolution => Status::unauthenticated(value.to_string()),
+        Error::ApproveError(_) => Status::permission_denied(value.to_string()),
+        Error::Transport => Status::internal("Transport error"),
+        Error::DatabasePoolUnavailable => Status::internal("Database pool error"),
+        Error::DatabaseOperationFailed => Status::internal("Database error"),
+        Error::InternalError => Status::internal("Internal error"),
+    }
+}

server/crates/arbiter-server/src/grpc/mod.rs

@@ -0,0 +1,65 @@
+
+use arbiter_proto::proto::{
+    client::{ClientRequest, ClientResponse},
+    user_agent::{UserAgentRequest, UserAgentResponse},
+};
+use tokio::sync::mpsc;
+use tokio_stream::wrappers::ReceiverStream;
+use tonic::{Request, Response, Status, async_trait};
+use tracing::info;
+
+use crate::{
+    DEFAULT_CHANNEL_SIZE,
+    actors::{client::{ClientConnection, connect_client}, user_agent::{UserAgentConnection, connect_user_agent}},
+};
+
+pub mod client;
+pub mod user_agent;
+
+#[async_trait]
+impl arbiter_proto::proto::arbiter_service_server::ArbiterService for super::Server {
+    type UserAgentStream = ReceiverStream<Result<UserAgentResponse, Status>>;
+    type ClientStream = ReceiverStream<Result<ClientResponse, Status>>;
+
+    #[tracing::instrument(level = "debug", skip(self))]
+    async fn client(
+        &self,
+        request: Request<tonic::Streaming<ClientRequest>>,
+    ) -> Result<Response<Self::ClientStream>, Status> {
+        let req_stream = request.into_inner();
+        let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
+
+        let transport = client::GrpcTransport::new(tx, req_stream);
+        let props = ClientConnection::new(
+            self.context.db.clone(),
+            Box::new(transport),
+            self.context.actors.clone(),
+        );
+        tokio::spawn(connect_client(props));
+
+        info!(event = "connection established", "grpc.client");
+
+        Ok(Response::new(ReceiverStream::new(rx)))
+    }
+
+    #[tracing::instrument(level = "debug", skip(self))]
+    async fn user_agent(
+        &self,
+        request: Request<tonic::Streaming<UserAgentRequest>>,
+    ) -> Result<Response<Self::UserAgentStream>, Status> {
+        let req_stream = request.into_inner();
+        let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
+
+        let transport = user_agent::GrpcTransport::new(tx, req_stream);
+        let props = UserAgentConnection::new(
+            self.context.db.clone(),
+            self.context.actors.clone(),
+            Box::new(transport),
+        );
+        tokio::spawn(connect_user_agent(props));
+
+        info!(event = "connection established", "grpc.user_agent");
+
+        Ok(Response::new(ReceiverStream::new(rx)))
+    }
+}

server/crates/arbiter-server/src/grpc/user_agent.rs

@@ -0,0 +1,509 @@
+use arbiter_proto::{
+    proto::{
+        self,
+        evm::{
+            EtherTransferSettings as ProtoEtherTransferSettings, EvmError as ProtoEvmError,
+            EvmGrantCreateRequest, EvmGrantCreateResponse, EvmGrantDeleteRequest,
+            EvmGrantDeleteResponse, EvmGrantList, EvmGrantListResponse, GrantEntry,
+            SharedSettings as ProtoSharedSettings, SpecificGrant as ProtoSpecificGrant,
+            TokenTransferSettings as ProtoTokenTransferSettings,
+            VolumeRateLimit as ProtoVolumeRateLimit, WalletCreateResponse, WalletEntry, WalletList,
+            WalletListResponse, evm_grant_create_response::Result as EvmGrantCreateResult,
+            evm_grant_delete_response::Result as EvmGrantDeleteResult,
+            evm_grant_list_response::Result as EvmGrantListResult,
+            specific_grant::Grant as ProtoSpecificGrantType,
+            wallet_create_response::Result as WalletCreateResult,
+            wallet_list_response::Result as WalletListResult,
+        },
+        user_agent::{
+            AuthChallenge as ProtoAuthChallenge, AuthChallengeRequest as ProtoAuthChallengeRequest,
+            AuthChallengeSolution as ProtoAuthChallengeSolution, AuthOk as ProtoAuthOk,
+            BootstrapEncryptedKey as ProtoBootstrapEncryptedKey,
+            BootstrapResult as ProtoBootstrapResult, ClientConnectionCancel,
+            ClientConnectionRequest, ClientConnectionResponse, KeyType as ProtoKeyType,
+            UnsealEncryptedKey as ProtoUnsealEncryptedKey, UnsealResult as ProtoUnsealResult,
+            UnsealStart, UnsealStartResponse, UserAgentRequest, UserAgentResponse,
+            VaultState as ProtoVaultState, user_agent_request::Payload as UserAgentRequestPayload,
+            user_agent_response::Payload as UserAgentResponsePayload,
+        },
+    },
+    transport::{Bi, Error as TransportError},
+};
+use async_trait::async_trait;
+use futures::StreamExt as _;
+use prost_types::Timestamp;
+use tokio::sync::mpsc;
+use tonic::{Status, Streaming};
+
+use crate::{
+    actors::user_agent::{
+        self, AuthPublicKey, BootstrapError, Request as DomainRequest, Response as DomainResponse,
+        TransportResponseError, UnsealError, VaultState,
+    },
+    evm::{
+        policies::{Grant, SpecificGrant},
+        policies::{
+            SharedGrantSettings, TransactionRateLimit, VolumeRateLimit, ether_transfer,
+            token_transfers,
+        },
+    },
+};
+use alloy::primitives::{Address, U256};
+use chrono::{DateTime, TimeZone, Utc};
+
+pub struct GrpcTransport {
+    sender: mpsc::Sender<Result<UserAgentResponse, Status>>,
+    receiver: Streaming<UserAgentRequest>,
+}
+
+impl GrpcTransport {
+    pub fn new(
+        sender: mpsc::Sender<Result<UserAgentResponse, Status>>,
+        receiver: Streaming<UserAgentRequest>,
+    ) -> Self {
+        Self { sender, receiver }
+    }
+
+    fn request_to_domain(request: UserAgentRequest) -> Result<DomainRequest, Status> {
+        match request.payload {
+            Some(UserAgentRequestPayload::AuthChallengeRequest(ProtoAuthChallengeRequest {
+                pubkey,
+                bootstrap_token,
+                key_type,
+            })) => Ok(DomainRequest::AuthChallengeRequest {
+                pubkey: parse_auth_pubkey(key_type, pubkey)?,
+                bootstrap_token,
+            }),
+            Some(UserAgentRequestPayload::AuthChallengeSolution(ProtoAuthChallengeSolution {
+                signature,
+            })) => Ok(DomainRequest::AuthChallengeSolution { signature }),
+            Some(UserAgentRequestPayload::UnsealStart(UnsealStart { client_pubkey })) => {
+                let client_pubkey: [u8; 32] = client_pubkey
+                    .as_slice()
+                    .try_into()
+                    .map_err(|_| Status::invalid_argument("client_pubkey must be 32 bytes"))?;
+                Ok(DomainRequest::UnsealStart {
+                    client_pubkey: x25519_dalek::PublicKey::from(client_pubkey),
+                })
+            }
+            Some(UserAgentRequestPayload::UnsealEncryptedKey(ProtoUnsealEncryptedKey {
+                nonce,
+                ciphertext,
+                associated_data,
+            })) => Ok(DomainRequest::UnsealEncryptedKey {
+                nonce,
+                ciphertext,
+                associated_data,
+            }),
+            Some(UserAgentRequestPayload::BootstrapEncryptedKey(ProtoBootstrapEncryptedKey {
+                nonce,
+                ciphertext,
+                associated_data,
+            })) => Ok(DomainRequest::BootstrapEncryptedKey {
+                nonce,
+                ciphertext,
+                associated_data,
+            }),
+            Some(UserAgentRequestPayload::QueryVaultState(_)) => Ok(DomainRequest::QueryVaultState),
+            Some(UserAgentRequestPayload::EvmWalletCreate(_)) => Ok(DomainRequest::EvmWalletCreate),
+            Some(UserAgentRequestPayload::EvmWalletList(_)) => Ok(DomainRequest::EvmWalletList),
+            Some(UserAgentRequestPayload::ClientConnectionResponse(ClientConnectionResponse {
+                approved,
+            })) => Ok(DomainRequest::ClientConnectionResponse { approved }),
+
+            Some(UserAgentRequestPayload::EvmGrantList(_)) => Ok(DomainRequest::ListGrants),
+            Some(UserAgentRequestPayload::EvmGrantCreate(EvmGrantCreateRequest {
+                client_id,
+                shared,
+                specific,
+            })) => {
+                let shared = parse_shared_settings(client_id, shared)?;
+                let specific = parse_specific_grant(specific)?;
+                Ok(DomainRequest::EvmGrantCreate {
+                    client_id,
+                    shared,
+                    specific,
+                })
+            }
+            Some(UserAgentRequestPayload::EvmGrantDelete(EvmGrantDeleteRequest { grant_id })) => {
+                Ok(DomainRequest::EvmGrantDelete { grant_id })
+            }
+            None => Err(Status::invalid_argument(
+                "Missing user-agent request payload",
+            )),
+        }
+    }
+
+    fn response_to_proto(response: DomainResponse) -> UserAgentResponse {
+        let payload = match response {
+            DomainResponse::AuthChallenge { nonce } => {
+                UserAgentResponsePayload::AuthChallenge(ProtoAuthChallenge {
+                    pubkey: Vec::new(),
+                    nonce,
+                })
+            }
+            DomainResponse::AuthOk => UserAgentResponsePayload::AuthOk(ProtoAuthOk {}),
+            DomainResponse::UnsealStartResponse { server_pubkey } => {
+                UserAgentResponsePayload::UnsealStartResponse(UnsealStartResponse {
+                    server_pubkey: server_pubkey.as_bytes().to_vec(),
+                })
+            }
+            DomainResponse::UnsealResult(result) => UserAgentResponsePayload::UnsealResult(
+                match result {
+                    Ok(()) => ProtoUnsealResult::Success,
+                    Err(UnsealError::InvalidKey) => ProtoUnsealResult::InvalidKey,
+                    Err(UnsealError::Unbootstrapped) => ProtoUnsealResult::Unbootstrapped,
+                }
+                .into(),
+            ),
+            DomainResponse::BootstrapResult(result) => UserAgentResponsePayload::BootstrapResult(
+                match result {
+                    Ok(()) => ProtoBootstrapResult::Success,
+                    Err(BootstrapError::AlreadyBootstrapped) => {
+                        ProtoBootstrapResult::AlreadyBootstrapped
+                    }
+                    Err(BootstrapError::InvalidKey) => ProtoBootstrapResult::InvalidKey,
+                }
+                .into(),
+            ),
+            DomainResponse::VaultState(state) => UserAgentResponsePayload::VaultState(
+                match state {
+                    VaultState::Unbootstrapped => ProtoVaultState::Unbootstrapped,
+                    VaultState::Sealed => ProtoVaultState::Sealed,
+                    VaultState::Unsealed => ProtoVaultState::Unsealed,
+                }
+                .into(),
+            ),
+            DomainResponse::ClientConnectionRequest { pubkey } => {
+                UserAgentResponsePayload::ClientConnectionRequest(ClientConnectionRequest {
+                    pubkey: pubkey.to_bytes().to_vec(),
+                })
+            }
+            DomainResponse::ClientConnectionCancel => {
+                UserAgentResponsePayload::ClientConnectionCancel(ClientConnectionCancel {})
+            }
+            DomainResponse::EvmWalletCreate(result) => {
+                UserAgentResponsePayload::EvmWalletCreate(WalletCreateResponse {
+                    result: Some(match result {
+                        Ok(()) => WalletCreateResult::Wallet(WalletEntry {
+                            address: Vec::new(),
+                        }),
+                        Err(_) => WalletCreateResult::Error(ProtoEvmError::Internal.into()),
+                    }),
+                })
+            }
+            DomainResponse::EvmWalletList(wallets) => {
+                UserAgentResponsePayload::EvmWalletList(WalletListResponse {
+                    result: Some(WalletListResult::Wallets(WalletList {
+                        wallets: wallets
+                            .into_iter()
+                            .map(|addr| WalletEntry {
+                                address: addr.as_slice().to_vec(),
+                            })
+                            .collect(),
+                    })),
+                })
+            }
+            DomainResponse::ListGrants(grants) => {
+                UserAgentResponsePayload::EvmGrantList(EvmGrantListResponse {
+                    result: Some(EvmGrantListResult::Grants(EvmGrantList {
+                        grants: grants.into_iter().map(grant_to_proto).collect(),
+                    })),
+                })
+            }
+            DomainResponse::EvmGrantCreate(result) => {
+                UserAgentResponsePayload::EvmGrantCreate(EvmGrantCreateResponse {
+                    result: Some(match result {
+                        Ok(grant_id) => EvmGrantCreateResult::GrantId(grant_id),
+                        Err(_) => EvmGrantCreateResult::Error(ProtoEvmError::Internal.into()),
+                    }),
+                })
+            }
+            DomainResponse::EvmGrantDelete(result) => {
+                UserAgentResponsePayload::EvmGrantDelete(EvmGrantDeleteResponse {
+                    result: Some(match result {
+                        Ok(()) => EvmGrantDeleteResult::Ok(()),
+                        Err(_) => EvmGrantDeleteResult::Error(ProtoEvmError::Internal.into()),
+                    }),
+                })
+            }
+        };
+
+        UserAgentResponse {
+            payload: Some(payload),
+        }
+    }
+
+    fn error_to_status(value: TransportResponseError) -> Status {
+        match value {
+            TransportResponseError::UnexpectedRequestPayload => {
+                Status::invalid_argument("Expected message with payload")
+            }
+            TransportResponseError::InvalidStateForUnsealEncryptedKey => {
+                Status::failed_precondition("Invalid state for unseal encrypted key")
+            }
+            TransportResponseError::InvalidClientPubkeyLength => {
+                Status::invalid_argument("client_pubkey must be 32 bytes")
+            }
+            TransportResponseError::StateTransitionFailed => {
+                Status::internal("State machine error")
+            }
+            TransportResponseError::KeyHolderActorUnreachable => {
+                Status::internal("Vault is not available")
+            }
+            TransportResponseError::Auth(ref err) => auth_error_status(err),
+            TransportResponseError::ConnectionRegistrationFailed => {
+                Status::internal("Failed registering connection")
+            }
+        }
+    }
+}
+
+#[async_trait]
+impl Bi<DomainRequest, Result<DomainResponse, TransportResponseError>> for GrpcTransport {
+    async fn send(
+        &mut self,
+        item: Result<DomainResponse, TransportResponseError>,
+    ) -> Result<(), TransportError> {
+        let outbound = match item {
+            Ok(message) => Ok(Self::response_to_proto(message)),
+            Err(err) => Err(Self::error_to_status(err)),
+        };
+
+        self.sender
+            .send(outbound)
+            .await
+            .map_err(|_| TransportError::ChannelClosed)
+    }
+
+    async fn recv(&mut self) -> Option<DomainRequest> {
+        match self.receiver.next().await {
+            Some(Ok(item)) => match Self::request_to_domain(item) {
+                Ok(request) => Some(request),
+                Err(status) => {
+                    let _ = self.sender.send(Err(status)).await;
+                    None
+                }
+            },
+            Some(Err(error)) => {
+                tracing::error!(error = ?error, "grpc user-agent recv failed; closing stream");
+                None
+            }
+            None => None,
+        }
+    }
+}
+
+fn grant_to_proto(grant: Grant<SpecificGrant>) -> proto::evm::GrantEntry {
+    GrantEntry {
+        id: grant.id,
+        specific: Some(match grant.settings {
+            SpecificGrant::EtherTransfer(settings) => ProtoSpecificGrant {
+                grant: Some(ProtoSpecificGrantType::EtherTransfer(
+                    ProtoEtherTransferSettings {
+                        targets: settings
+                            .target
+                            .into_iter()
+                            .map(|addr| addr.as_slice().to_vec())
+                            .collect(),
+                        limit: Some(proto::evm::VolumeRateLimit {
+                            max_volume: settings.limit.max_volume.to_be_bytes_vec(),
+                            window_secs: settings.limit.window.num_seconds(),
+                        }),
+                    },
+                )),
+            },
+            SpecificGrant::TokenTransfer(settings) => ProtoSpecificGrant {
+                grant: Some(ProtoSpecificGrantType::TokenTransfer(
+                    ProtoTokenTransferSettings {
+                        token_contract: settings.token_contract.as_slice().to_vec(),
+                        target: settings.target.map(|addr| addr.as_slice().to_vec()),
+                        volume_limits: settings
+                            .volume_limits
+                            .into_iter()
+                            .map(|vrl| proto::evm::VolumeRateLimit {
+                                max_volume: vrl.max_volume.to_be_bytes_vec(),
+                                window_secs: vrl.window.num_seconds(),
+                            })
+                            .collect(),
+                    },
+                )),
+            },
+        }),
+        client_id: grant.shared.client_id,
+        shared: Some(proto::evm::SharedSettings {
+            wallet_id: grant.shared.wallet_id,
+            chain_id: grant.shared.chain,
+            valid_from: grant.shared.valid_from.map(|dt| Timestamp {
+                seconds: dt.timestamp(),
+                nanos: 0,
+            }),
+            valid_until: grant.shared.valid_until.map(|dt| Timestamp {
+                seconds: dt.timestamp(),
+                nanos: 0,
+            }),
+            max_gas_fee_per_gas: grant
+                .shared
+                .max_gas_fee_per_gas
+                .map(|fee| fee.to_be_bytes_vec()),
+            max_priority_fee_per_gas: grant
+                .shared
+                .max_priority_fee_per_gas
+                .map(|fee| fee.to_be_bytes_vec()),
+            rate_limit: grant
+                .shared
+                .rate_limit
+                .map(|limit| proto::evm::TransactionRateLimit {
+                    count: limit.count,
+                    window_secs: limit.window.num_seconds(),
+                }),
+        }),
+    }
+}
+
+fn parse_volume_rate_limit(vrl: ProtoVolumeRateLimit) -> Result<VolumeRateLimit, Status> {
+    Ok(VolumeRateLimit {
+        max_volume: U256::from_be_slice(&vrl.max_volume),
+        window: chrono::Duration::seconds(vrl.window_secs),
+    })
+}
+
+fn parse_shared_settings(
+    client_id: i32,
+    proto: Option<ProtoSharedSettings>,
+) -> Result<SharedGrantSettings, Status> {
+    let s = proto.ok_or_else(|| Status::invalid_argument("missing shared settings"))?;
+    let parse_u256 = |b: Vec<u8>| -> Result<U256, Status> {
+        if b.is_empty() {
+            Err(Status::invalid_argument("U256 bytes must not be empty"))
+        } else {
+            Ok(U256::from_be_slice(&b))
+        }
+    };
+    let parse_ts = |ts: prost_types::Timestamp| -> Result<DateTime<Utc>, Status> {
+        Utc.timestamp_opt(ts.seconds, ts.nanos as u32)
+            .single()
+            .ok_or_else(|| Status::invalid_argument("invalid timestamp"))
+    };
+    Ok(SharedGrantSettings {
+        wallet_id: s.wallet_id,
+        client_id,
+        chain: s.chain_id,
+        valid_from: s.valid_from.map(parse_ts).transpose()?,
+        valid_until: s.valid_until.map(parse_ts).transpose()?,
+        max_gas_fee_per_gas: s.max_gas_fee_per_gas.map(parse_u256).transpose()?,
+        max_priority_fee_per_gas: s.max_priority_fee_per_gas.map(parse_u256).transpose()?,
+        rate_limit: s.rate_limit.map(|rl| TransactionRateLimit {
+            count: rl.count,
+            window: chrono::Duration::seconds(rl.window_secs),
+        }),
+    })
+}
+
+fn parse_specific_grant(proto: Option<proto::evm::SpecificGrant>) -> Result<SpecificGrant, Status> {
+    use proto::evm::specific_grant::Grant as ProtoGrant;
+    let g = proto
+        .and_then(|sg| sg.grant)
+        .ok_or_else(|| Status::invalid_argument("missing specific grant"))?;
+    match g {
+        ProtoGrant::EtherTransfer(s) => {
+            let limit = parse_volume_rate_limit(
+                s.limit
+                    .ok_or_else(|| Status::invalid_argument("missing ether transfer limit"))?,
+            )?;
+            let target = s
+                .targets
+                .into_iter()
+                .map(|b| {
+                    if b.len() == 20 {
+                        Ok(Address::from_slice(&b))
+                    } else {
+                        Err(Status::invalid_argument(
+                            "ether transfer target must be 20 bytes",
+                        ))
+                    }
+                })
+                .collect::<Result<Vec<_>, _>>()?;
+            Ok(SpecificGrant::EtherTransfer(ether_transfer::Settings {
+                target,
+                limit,
+            }))
+        }
+        ProtoGrant::TokenTransfer(s) => {
+            if s.token_contract.len() != 20 {
+                return Err(Status::invalid_argument("token_contract must be 20 bytes"));
+            }
+            let target = s
+                .target
+                .map(|b| {
+                    if b.len() == 20 {
+                        Ok(Address::from_slice(&b))
+                    } else {
+                        Err(Status::invalid_argument(
+                            "token transfer target must be 20 bytes",
+                        ))
+                    }
+                })
+                .transpose()?;
+            let volume_limits = s
+                .volume_limits
+                .into_iter()
+                .map(parse_volume_rate_limit)
+                .collect::<Result<Vec<_>, _>>()?;
+            Ok(SpecificGrant::TokenTransfer(token_transfers::Settings {
+                token_contract: Address::from_slice(&s.token_contract),
+                target,
+                volume_limits,
+            }))
+        }
+    }
+}
+
+fn parse_auth_pubkey(key_type: i32, pubkey: Vec<u8>) -> Result<AuthPublicKey, Status> {
+    match ProtoKeyType::try_from(key_type).unwrap_or(ProtoKeyType::Unspecified) {
+        ProtoKeyType::Unspecified | ProtoKeyType::Ed25519 => {
+            let bytes: [u8; 32] = pubkey
+                .as_slice()
+                .try_into()
+                .map_err(|_| Status::invalid_argument("invalid Ed25519 public key length"))?;
+            let key = ed25519_dalek::VerifyingKey::from_bytes(&bytes)
+                .map_err(|_| Status::invalid_argument("invalid Ed25519 public key encoding"))?;
+            Ok(AuthPublicKey::Ed25519(key))
+        }
+        ProtoKeyType::EcdsaSecp256k1 => {
+            let key = k256::ecdsa::VerifyingKey::from_sec1_bytes(&pubkey)
+                .map_err(|_| Status::invalid_argument("invalid secp256k1 public key encoding"))?;
+            Ok(AuthPublicKey::EcdsaSecp256k1(key))
+        }
+        ProtoKeyType::Rsa => {
+            use rsa::pkcs8::DecodePublicKey as _;
+
+            let key = rsa::RsaPublicKey::from_public_key_der(&pubkey)
+                .map_err(|_| Status::invalid_argument("invalid RSA public key encoding"))?;
+            Ok(AuthPublicKey::Rsa(key))
+        }
+    }
+}
+
+fn auth_error_status(value: &user_agent::auth::Error) -> Status {
+    use user_agent::auth::Error;
+
+    match value {
+        Error::UnexpectedMessagePayload | Error::InvalidClientPubkeyLength => {
+            Status::invalid_argument(value.to_string())
+        }
+        Error::InvalidAuthPubkeyEncoding => {
+            Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
+        }
+        Error::PublicKeyNotRegistered | Error::InvalidChallengeSolution => {
+            Status::unauthenticated(value.to_string())
+        }
+        Error::InvalidBootstrapToken => Status::invalid_argument("Invalid bootstrap token"),
+        Error::Transport => Status::internal("Transport error"),
+        Error::BootstrapperActorUnreachable => {
+            Status::internal("Bootstrap token consumption failed")
+        }
+        Error::DatabasePoolUnavailable => Status::internal("Database pool error"),
+        Error::DatabaseOperationFailed => Status::internal("Database error"),
+    }
+}

server/crates/arbiter-server/src/lib.rs

@@ -1,135 +1,21 @@
 #![forbid(unsafe_code)]
-use arbiter_proto::{
-    proto::{
-        client::{ClientRequest, ClientResponse},
-        user_agent::{UserAgentRequest, UserAgentResponse},
-    },
-    transport::{IdentityRecvConverter, SendConverter, grpc},
-};
-use async_trait::async_trait;
-use tokio_stream::wrappers::ReceiverStream;
+#![deny(
+    clippy::unwrap_used,
+    clippy::expect_used,
+    clippy::panic
+)]
 
-use tokio::sync::mpsc;
-use tonic::{Request, Response, Status};
-use tracing::info;
-
-use crate::{
-    actors::{
-        client::{self, ClientError, ClientConnection as ClientConnectionProps, connect_client},
-        user_agent::{self, UserAgentConnection, UserAgentError, connect_user_agent},
-    },
-    context::ServerContext,
-};
+use crate::context::ServerContext;
 
 pub mod actors;
 pub mod context;
 pub mod db;
 pub mod evm;
+pub mod grpc;
+pub mod safe_cell;
 
 const DEFAULT_CHANNEL_SIZE: usize = 1000;
 
-struct UserAgentGrpcSender;
-
-impl SendConverter for UserAgentGrpcSender {
-    type Input = Result<UserAgentResponse, UserAgentError>;
-    type Output = Result<UserAgentResponse, Status>;
-
-    fn convert(&self, item: Self::Input) -> Self::Output {
-        match item {
-            Ok(message) => Ok(message),
-            Err(err) => Err(user_agent_error_status(err)),
-        }
-    }
-}
-
-struct ClientGrpcSender;
-
-impl SendConverter for ClientGrpcSender {
-    type Input = Result<ClientResponse, ClientError>;
-    type Output = Result<ClientResponse, Status>;
-
-    fn convert(&self, item: Self::Input) -> Self::Output {
-        match item {
-            Ok(message) => Ok(message),
-            Err(err) => Err(client_error_status(err)),
-        }
-    }
-}
-
-fn client_error_status(value: ClientError) -> Status {
-    match value {
-        ClientError::MissingRequestPayload | ClientError::UnexpectedRequestPayload => {
-            Status::invalid_argument("Expected message with payload")
-        }
-        ClientError::StateTransitionFailed => Status::internal("State machine error"),
-        ClientError::Auth(ref err) => client_auth_error_status(err),
-        ClientError::ConnectionRegistrationFailed => {
-            Status::internal("Connection registration failed")
-        }
-    }
-}
-
-fn client_auth_error_status(value: &client::auth::Error) -> Status {
-    use client::auth::Error;
-    match value {
-        Error::UnexpectedMessagePayload | Error::InvalidClientPubkeyLength => {
-            Status::invalid_argument(value.to_string())
-        }
-        Error::InvalidAuthPubkeyEncoding => {
-            Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
-        }
-        Error::InvalidSignatureLength => Status::invalid_argument("Invalid signature length"),
-        Error::PublicKeyNotRegistered | Error::InvalidChallengeSolution => {
-            Status::unauthenticated(value.to_string())
-        }
-        Error::Transport => Status::internal("Transport error"),
-        Error::DatabasePoolUnavailable => Status::internal("Database pool error"),
-        Error::DatabaseOperationFailed => Status::internal("Database error"),
-    }
-}
-
-fn user_agent_error_status(value: UserAgentError) -> Status {
-    match value {
-        UserAgentError::MissingRequestPayload | UserAgentError::UnexpectedRequestPayload => {
-            Status::invalid_argument("Expected message with payload")
-        }
-        UserAgentError::InvalidStateForUnsealEncryptedKey => {
-            Status::failed_precondition("Invalid state for unseal encrypted key")
-        }
-        UserAgentError::InvalidClientPubkeyLength => {
-            Status::invalid_argument("client_pubkey must be 32 bytes")
-        }
-        UserAgentError::StateTransitionFailed => Status::internal("State machine error"),
-        UserAgentError::KeyHolderActorUnreachable => Status::internal("Vault is not available"),
-        UserAgentError::Auth(ref err) => auth_error_status(err),
-        UserAgentError::ConnectionRegistrationFailed => {
-            Status::internal("Failed registering connection")
-        }
-    }
-}
-
-fn auth_error_status(value: &user_agent::auth::Error) -> Status {
-    use user_agent::auth::Error;
-    match value {
-        Error::UnexpectedMessagePayload | Error::InvalidClientPubkeyLength => {
-            Status::invalid_argument(value.to_string())
-        }
-        Error::InvalidAuthPubkeyEncoding => {
-            Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
-        }
-        Error::PublicKeyNotRegistered | Error::InvalidChallengeSolution => {
-            Status::unauthenticated(value.to_string())
-        }
-        Error::InvalidBootstrapToken => Status::invalid_argument("Invalid bootstrap token"),
-        Error::Transport => Status::internal("Transport error"),
-        Error::BootstrapperActorUnreachable => {
-            Status::internal("Bootstrap token consumption failed")
-        }
-        Error::DatabasePoolUnavailable => Status::internal("Database pool error"),
-        Error::DatabaseOperationFailed => Status::internal("Database error"),
-    }
-}
-
 pub struct Server {
     context: ServerContext,
 }
@@ -140,60 +26,3 @@ impl Server {
     }
 }
 
-#[async_trait]
-impl arbiter_proto::proto::arbiter_service_server::ArbiterService for Server {
-    type UserAgentStream = ReceiverStream<Result<UserAgentResponse, Status>>;
-    type ClientStream = ReceiverStream<Result<ClientResponse, Status>>;
-
-    #[tracing::instrument(level = "debug", skip(self))]
-    async fn client(
-        &self,
-        request: Request<tonic::Streaming<ClientRequest>>,
-    ) -> Result<Response<Self::ClientStream>, Status> {
-        let req_stream = request.into_inner();
-        let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
-
-        let transport = grpc::GrpcAdapter::new(
-            tx,
-            req_stream,
-            IdentityRecvConverter::<ClientRequest>::new(),
-            ClientGrpcSender,
-        );
-        let props = ClientConnectionProps::new(
-            self.context.db.clone(),
-            Box::new(transport),
-            self.context.actors.clone(),
-        );
-        tokio::spawn(connect_client(props));
-
-        info!(event = "connection established", "grpc.client");
-
-        Ok(Response::new(ReceiverStream::new(rx)))
-    }
-
-    #[tracing::instrument(level = "debug", skip(self))]
-    async fn user_agent(
-        &self,
-        request: Request<tonic::Streaming<UserAgentRequest>>,
-    ) -> Result<Response<Self::UserAgentStream>, Status> {
-        let req_stream = request.into_inner();
-        let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
-
-        let transport = grpc::GrpcAdapter::new(
-            tx,
-            req_stream,
-            IdentityRecvConverter::<UserAgentRequest>::new(),
-            UserAgentGrpcSender,
-        );
-        let props = UserAgentConnection::new(
-            self.context.db.clone(),
-            self.context.actors.clone(),
-            Box::new(transport),
-        );
-        tokio::spawn(connect_user_agent(props));
-
-        info!(event = "connection established", "grpc.user_agent");
-
-        Ok(Response::new(ReceiverStream::new(rx)))
-    }
-}

server/crates/arbiter-server/src/main.rs

@@ -3,6 +3,7 @@ use std::net::SocketAddr;
 use arbiter_proto::{proto::arbiter_service_server::ArbiterServiceServer, url::ArbiterUrl};
 use arbiter_server::{Server, actors::bootstrap::GetToken, context::ServerContext, db};
 use miette::miette;
+use rustls::crypto::aws_lc_rs;
 use tonic::transport::{Identity, ServerTlsConfig};
 use tracing::info;
 
@@ -10,6 +11,8 @@ const PORT: u16 = 50051;
 
 #[tokio::main]
 async fn main() -> miette::Result<()> {
+    aws_lc_rs::default_provider().install_default().unwrap();
+
     tracing_subscriber::fmt()
         .with_env_filter(
             tracing_subscriber::EnvFilter::try_from_default_env()

server/crates/arbiter-server/src/safe_cell.rs

@@ -0,0 +1,111 @@
+use std::ops::{Deref, DerefMut};
+use std::{any::type_name, fmt};
+
+use memsafe::MemSafe;
+
+pub trait SafeCellHandle<T> {
+    type CellRead<'a>: Deref<Target = T>
+    where
+        Self: 'a,
+        T: 'a;
+    type CellWrite<'a>: Deref<Target = T> + DerefMut<Target = T>
+    where
+        Self: 'a,
+        T: 'a;
+
+    fn new(value: T) -> Self
+    where
+        Self: Sized;
+
+    fn read(&mut self) -> Self::CellRead<'_>;
+    fn write(&mut self) -> Self::CellWrite<'_>;
+
+    fn new_inline<F>(f: F) -> Self
+    where
+        Self: Sized,
+        T: Default,
+        F: for<'a> FnOnce(&'a mut T),
+    {
+        let mut cell = Self::new(T::default());
+        {
+            let mut handle = cell.write();
+            f(handle.deref_mut());
+        }
+        cell
+    }
+
+    #[inline(always)]
+    fn read_inline<F, R>(&mut self, f: F) -> R
+    where
+        F: FnOnce(&T) -> R,
+    {
+        f(&*self.read())
+    }
+
+    #[inline(always)]
+    fn write_inline<F, R>(&mut self, f: F) -> R
+    where
+        F: FnOnce(&mut T) -> R,
+    {
+        f(&mut *self.write())
+    }
+}
+
+pub struct MemSafeCell<T>(MemSafe<T>);
+
+impl<T> fmt::Debug for MemSafeCell<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("MemSafeCell")
+            .field("inner", &format_args!("<protected {}>", type_name::<T>()))
+            .finish()
+    }
+}
+
+impl<T> SafeCellHandle<T> for MemSafeCell<T> {
+    type CellRead<'a>
+        = memsafe::MemSafeRead<'a, T>
+    where
+        Self: 'a,
+        T: 'a;
+    type CellWrite<'a>
+        = memsafe::MemSafeWrite<'a, T>
+    where
+        Self: 'a,
+        T: 'a;
+
+    fn new(value: T) -> Self {
+        match MemSafe::new(value) {
+            Ok(inner) => Self(inner),
+            Err(err) => {
+                // If protected memory cannot be allocated, process integrity is compromised.
+                abort_memory_breach("safe cell allocation", &err)
+            }
+        }
+    }
+
+    #[inline(always)]
+    fn read(&mut self) -> Self::CellRead<'_> {
+        match self.0.read() {
+            Ok(inner) => inner,
+            Err(err) => abort_memory_breach("safe cell read", &err),
+        }
+    }
+
+    #[inline(always)]
+    fn write(&mut self) -> Self::CellWrite<'_> {
+        match self.0.write() {
+            Ok(inner) => inner,
+            Err(err) => {
+                // If protected memory becomes unwritable here, treat it as a fatal memory breach.
+                abort_memory_breach("safe cell write", &err)
+            }
+        }
+    }
+}
+
+fn abort_memory_breach(action: &str, err: &memsafe::error::MemoryError) -> ! {
+    eprintln!("fatal {action}: {err}");
+    std::process::abort();
+}
+
+pub type SafeCell<T> = MemSafeCell<T>;

server/crates/arbiter-server/tests/client/auth.rs

@@ -1,12 +1,7 @@
-use arbiter_proto::proto::client::{
-    AuthChallengeRequest, AuthChallengeSolution, ClientRequest,
-    client_request::Payload as ClientRequestPayload,
-    client_response::Payload as ClientResponsePayload,
-};
 use arbiter_proto::transport::Bi;
 use arbiter_server::actors::GlobalActors;
 use arbiter_server::{
-    actors::client::{ClientConnection, connect_client},
+    actors::client::{ClientConnection, Request, Response, connect_client},
     db::{self, schema},
 };
 use diesel::{ExpressionMethods as _, insert_into};
@@ -29,12 +24,8 @@ pub async fn test_unregistered_pubkey_rejected() {
     let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
 
     test_transport
-        .send(ClientRequest {
-            payload: Some(ClientRequestPayload::AuthChallengeRequest(
-                AuthChallengeRequest {
-                    pubkey: pubkey_bytes,
-                },
-            )),
+        .send(Request::AuthChallengeRequest {
+            pubkey: pubkey_bytes,
         })
         .await
         .unwrap();
@@ -68,12 +59,8 @@ pub async fn test_challenge_auth() {
 
     // Send challenge request
     test_transport
-        .send(ClientRequest {
-            payload: Some(ClientRequestPayload::AuthChallengeRequest(
-                AuthChallengeRequest {
-                    pubkey: pubkey_bytes,
-                },
-            )),
+        .send(Request::AuthChallengeRequest {
+            pubkey: pubkey_bytes,
         })
         .await
         .unwrap();
@@ -84,24 +71,20 @@ pub async fn test_challenge_auth() {
         .await
         .expect("should receive challenge");
     let challenge = match response {
-        Ok(resp) => match resp.payload {
-            Some(ClientResponsePayload::AuthChallenge(c)) => c,
+        Ok(resp) => match resp {
+            Response::AuthChallenge { pubkey, nonce } => (pubkey, nonce),
             other => panic!("Expected AuthChallenge, got {other:?}"),
         },
         Err(err) => panic!("Expected Ok response, got Err({err:?})"),
     };
 
     // Sign the challenge and send solution
-    let formatted_challenge = arbiter_proto::format_challenge(challenge.nonce, &challenge.pubkey);
+    let formatted_challenge = arbiter_proto::format_challenge(challenge.1, &challenge.0);
     let signature = new_key.sign(&formatted_challenge);
 
     test_transport
-        .send(ClientRequest {
-            payload: Some(ClientRequestPayload::AuthChallengeSolution(
-                AuthChallengeSolution {
-                    signature: signature.to_bytes().to_vec(),
-                },
-            )),
+        .send(Request::AuthChallengeSolution {
+            signature: signature.to_bytes().to_vec(),
         })
         .await
         .unwrap();

server/crates/arbiter-server/tests/common/mod.rs

@@ -1,20 +1,18 @@
 use arbiter_proto::transport::{Bi, Error};
 use arbiter_server::{
     actors::keyholder::KeyHolder,
-    db::{self, schema},
+    db::{self, schema}, safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use async_trait::async_trait;
 use diesel::QueryDsl;
 use diesel_async::RunQueryDsl;
-use memsafe::MemSafe;
 use tokio::sync::mpsc;
 
-
 #[allow(dead_code)]
 pub async fn bootstrapped_keyholder(db: &db::DatabasePool) -> KeyHolder {
     let mut actor = KeyHolder::new(db.clone()).await.unwrap();
     actor
-        .bootstrap(MemSafe::new(b"test-seal-key".to_vec()).unwrap())
+        .bootstrap(SafeCell::new(b"test-seal-key".to_vec()))
         .await
         .unwrap();
     actor
@@ -31,13 +29,14 @@ pub async fn root_key_history_id(db: &db::DatabasePool) -> i32 {
     id.expect("root_key_id should be set after bootstrap")
 }
 
-
+#[allow(dead_code)]
 pub struct ChannelTransport<T, Y> {
     receiver: mpsc::Receiver<T>,
     sender: mpsc::Sender<Y>,
 }
 
 impl<T, Y> ChannelTransport<T, Y> {
+    #[allow(dead_code)]
     pub fn new() -> (Self, ChannelTransport<Y, T>) {
         let (tx1, rx1) = mpsc::channel(10);
         let (tx2, rx2) = mpsc::channel(10);
@@ -54,8 +53,6 @@ impl<T, Y> ChannelTransport<T, Y> {
     }
 }
 
-
-
 #[async_trait]
 impl<T, Y> Bi<T, Y> for ChannelTransport<T, Y>
 where

server/crates/arbiter-server/tests/keyholder/concurrency.rs

@@ -3,11 +3,11 @@ use std::collections::{HashMap, HashSet};
 use arbiter_server::{
     actors::keyholder::{CreateNew, Error, KeyHolder},
     db::{self, models, schema},
+    safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use diesel::{ExpressionMethods as _, QueryDsl, SelectableHelper, dsl::sql_query};
 use diesel_async::RunQueryDsl;
 use kameo::actor::{ActorRef, Spawn as _};
-use memsafe::MemSafe;
 use tokio::task::JoinSet;
 
 use crate::common;
@@ -24,7 +24,7 @@ async fn write_concurrently(
             let plaintext = format!("{prefix}-{i}").into_bytes();
             let id = actor
                 .ask(CreateNew {
-                    plaintext: MemSafe::new(plaintext.clone()).unwrap(),
+                    plaintext: SafeCell::new(plaintext.clone()),
                 })
                 .await
                 .unwrap();
@@ -118,7 +118,7 @@ async fn insert_failure_does_not_create_partial_row() {
     drop(conn);
 
     let err = actor
-        .create_new(MemSafe::new(b"should fail".to_vec()).unwrap())
+        .create_new(SafeCell::new(b"should fail".to_vec()))
         .await
         .unwrap_err();
     assert!(matches!(err, Error::DatabaseTransaction(_)));
@@ -162,12 +162,12 @@ async fn decrypt_roundtrip_after_high_concurrency() {
 
     let mut decryptor = KeyHolder::new(db.clone()).await.unwrap();
     decryptor
-        .try_unseal(MemSafe::new(b"test-seal-key".to_vec()).unwrap())
+        .try_unseal(SafeCell::new(b"test-seal-key".to_vec()))
         .await
         .unwrap();
 
     for (id, plaintext) in expected {
         let mut decrypted = decryptor.decrypt(id).await.unwrap();
-        assert_eq!(*decrypted.read().unwrap(), plaintext);
+        assert_eq!(*decrypted.read(), plaintext);
     }
 }

server/crates/arbiter-server/tests/keyholder/lifecycle.rs

@@ -1,10 +1,10 @@
 use arbiter_server::{
     actors::keyholder::{Error, KeyHolder},
     db::{self, models, schema},
+    safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use diesel::{QueryDsl, SelectableHelper};
 use diesel_async::RunQueryDsl;
-use memsafe::MemSafe;
 
 use crate::common;
 
@@ -14,7 +14,7 @@ async fn test_bootstrap() {
     let db = db::create_test_pool().await;
     let mut actor = KeyHolder::new(db.clone()).await.unwrap();
 
-    let seal_key = MemSafe::new(b"test-seal-key".to_vec()).unwrap();
+    let seal_key = SafeCell::new(b"test-seal-key".to_vec());
     actor.bootstrap(seal_key).await.unwrap();
 
     let mut conn = db.get().await.unwrap();
@@ -43,7 +43,7 @@ async fn test_bootstrap_rejects_double() {
     let db = db::create_test_pool().await;
     let mut actor = common::bootstrapped_keyholder(&db).await;
 
-    let seal_key2 = MemSafe::new(b"test-seal-key".to_vec()).unwrap();
+    let seal_key2 = SafeCell::new(b"test-seal-key".to_vec());
     let err = actor.bootstrap(seal_key2).await.unwrap_err();
     assert!(matches!(err, Error::AlreadyBootstrapped));
 }
@@ -55,7 +55,7 @@ async fn test_create_new_before_bootstrap_fails() {
     let mut actor = KeyHolder::new(db).await.unwrap();
 
     let err = actor
-        .create_new(MemSafe::new(b"data".to_vec()).unwrap())
+        .create_new(SafeCell::new(b"data".to_vec()))
         .await
         .unwrap_err();
     assert!(matches!(err, Error::NotBootstrapped));
@@ -91,17 +91,17 @@ async fn test_unseal_correct_password() {
 
     let plaintext = b"survive a restart";
     let aead_id = actor
-        .create_new(MemSafe::new(plaintext.to_vec()).unwrap())
+        .create_new(SafeCell::new(plaintext.to_vec()))
         .await
         .unwrap();
     drop(actor);
 
     let mut actor = KeyHolder::new(db.clone()).await.unwrap();
-    let seal_key = MemSafe::new(b"test-seal-key".to_vec()).unwrap();
+    let seal_key = SafeCell::new(b"test-seal-key".to_vec());
     actor.try_unseal(seal_key).await.unwrap();
 
     let mut decrypted = actor.decrypt(aead_id).await.unwrap();
-    assert_eq!(*decrypted.read().unwrap(), plaintext);
+    assert_eq!(*decrypted.read(), plaintext);
 }
 
 #[tokio::test]
@@ -112,20 +112,20 @@ async fn test_unseal_wrong_then_correct_password() {
 
     let plaintext = b"important data";
     let aead_id = actor
-        .create_new(MemSafe::new(plaintext.to_vec()).unwrap())
+        .create_new(SafeCell::new(plaintext.to_vec()))
         .await
         .unwrap();
     drop(actor);
 
     let mut actor = KeyHolder::new(db.clone()).await.unwrap();
 
-    let bad_key = MemSafe::new(b"wrong-password".to_vec()).unwrap();
+    let bad_key = SafeCell::new(b"wrong-password".to_vec());
     let err = actor.try_unseal(bad_key).await.unwrap_err();
     assert!(matches!(err, Error::InvalidKey));
 
-    let good_key = MemSafe::new(b"test-seal-key".to_vec()).unwrap();
+    let good_key = SafeCell::new(b"test-seal-key".to_vec());
     actor.try_unseal(good_key).await.unwrap();
 
     let mut decrypted = actor.decrypt(aead_id).await.unwrap();
-    assert_eq!(*decrypted.read().unwrap(), plaintext);
+    assert_eq!(*decrypted.read(), plaintext);
 }

server/crates/arbiter-server/tests/keyholder/storage.rs

@@ -3,10 +3,10 @@ use std::collections::HashSet;
 use arbiter_server::{
     actors::keyholder::{Error, encryption::v1},
     db::{self, models, schema},
+    safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use diesel::{ExpressionMethods as _, QueryDsl, SelectableHelper, dsl::update};
 use diesel_async::RunQueryDsl;
-use memsafe::MemSafe;
 
 use crate::common;
 
@@ -18,12 +18,12 @@ async fn test_create_decrypt_roundtrip() {
 
     let plaintext = b"hello arbiter";
     let aead_id = actor
-        .create_new(MemSafe::new(plaintext.to_vec()).unwrap())
+        .create_new(SafeCell::new(plaintext.to_vec()))
         .await
         .unwrap();
 
     let mut decrypted = actor.decrypt(aead_id).await.unwrap();
-    assert_eq!(*decrypted.read().unwrap(), plaintext);
+    assert_eq!(*decrypted.read(), plaintext);
 }
 
 #[tokio::test]
@@ -44,11 +44,11 @@ async fn test_ciphertext_differs_across_entries() {
 
     let plaintext = b"same content";
     let id1 = actor
-        .create_new(MemSafe::new(plaintext.to_vec()).unwrap())
+        .create_new(SafeCell::new(plaintext.to_vec()))
         .await
         .unwrap();
     let id2 = actor
-        .create_new(MemSafe::new(plaintext.to_vec()).unwrap())
+        .create_new(SafeCell::new(plaintext.to_vec()))
         .await
         .unwrap();
 
@@ -70,8 +70,8 @@ async fn test_ciphertext_differs_across_entries() {
 
     let mut d1 = actor.decrypt(id1).await.unwrap();
     let mut d2 = actor.decrypt(id2).await.unwrap();
-    assert_eq!(*d1.read().unwrap(), plaintext);
-    assert_eq!(*d2.read().unwrap(), plaintext);
+    assert_eq!(*d1.read(), plaintext);
+    assert_eq!(*d2.read(), plaintext);
 }
 
 #[tokio::test]
@@ -83,7 +83,7 @@ async fn test_nonce_never_reused() {
     let n = 5;
     for i in 0..n {
         actor
-            .create_new(MemSafe::new(format!("secret {i}").into_bytes()).unwrap())
+            .create_new(SafeCell::new(format!("secret {i}").into_bytes()))
             .await
             .unwrap();
     }
@@ -137,7 +137,7 @@ async fn broken_db_nonce_format_fails_closed() {
     drop(conn);
 
     let err = actor
-        .create_new(MemSafe::new(b"must fail".to_vec()).unwrap())
+        .create_new(SafeCell::new(b"must fail".to_vec()))
         .await
         .unwrap_err();
     assert!(matches!(err, Error::BrokenDatabase));
@@ -145,7 +145,7 @@ async fn broken_db_nonce_format_fails_closed() {
     let db = db::create_test_pool().await;
     let mut actor = common::bootstrapped_keyholder(&db).await;
     let id = actor
-        .create_new(MemSafe::new(b"decrypt target".to_vec()).unwrap())
+        .create_new(SafeCell::new(b"decrypt target".to_vec()))
         .await
         .unwrap();
     let mut conn = db.get().await.unwrap();

server/crates/arbiter-server/tests/user_agent/auth.rs

@@ -1,14 +1,9 @@
-use arbiter_proto::proto::user_agent::{
-    AuthChallengeRequest, AuthChallengeSolution, UserAgentRequest,
-    user_agent_request::Payload as UserAgentRequestPayload,
-    user_agent_response::Payload as UserAgentResponsePayload,
-};
 use arbiter_proto::transport::Bi;
 use arbiter_server::{
     actors::{
         GlobalActors,
         bootstrap::GetToken,
-        user_agent::{UserAgentConnection, connect_user_agent},
+        user_agent::{AuthPublicKey, Request, Response, UserAgentConnection, connect_user_agent},
     },
     db::{self, schema},
 };
@@ -30,16 +25,10 @@ pub async fn test_bootstrap_token_auth() {
     let task = tokio::spawn(connect_user_agent(props));
 
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
-    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
-
     test_transport
-        .send(UserAgentRequest {
-            payload: Some(UserAgentRequestPayload::AuthChallengeRequest(
-                AuthChallengeRequest {
-                    pubkey: pubkey_bytes,
-                    bootstrap_token: Some(token),
-                },
-            )),
+        .send(Request::AuthChallengeRequest {
+            pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
+            bootstrap_token: Some(token),
         })
         .await
         .unwrap();
@@ -66,16 +55,10 @@ pub async fn test_bootstrap_invalid_token_auth() {
     let task = tokio::spawn(connect_user_agent(props));
 
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
-    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
-
     test_transport
-        .send(UserAgentRequest {
-            payload: Some(UserAgentRequestPayload::AuthChallengeRequest(
-                AuthChallengeRequest {
-                    pubkey: pubkey_bytes,
-                    bootstrap_token: Some("invalid_token".to_string()),
-                },
-            )),
+        .send(Request::AuthChallengeRequest {
+            pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
+            bootstrap_token: Some("invalid_token".to_string()),
         })
         .await
         .unwrap();
@@ -102,10 +85,14 @@ pub async fn test_challenge_auth() {
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
     let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
 
+    // Pre-register key with key_type
     {
         let mut conn = db.get().await.unwrap();
         insert_into(schema::useragent_client::table)
-            .values(schema::useragent_client::public_key.eq(pubkey_bytes.clone()))
+            .values((
+                schema::useragent_client::public_key.eq(pubkey_bytes.clone()),
+                schema::useragent_client::key_type.eq(1i32),
+            ))
             .execute(&mut conn)
             .await
             .unwrap();
@@ -117,13 +104,9 @@ pub async fn test_challenge_auth() {
 
     // Send challenge request
     test_transport
-        .send(UserAgentRequest {
-            payload: Some(UserAgentRequestPayload::AuthChallengeRequest(
-                AuthChallengeRequest {
-                    pubkey: pubkey_bytes,
-                    bootstrap_token: None,
-                },
-            )),
+        .send(Request::AuthChallengeRequest {
+            pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
+            bootstrap_token: None,
         })
         .await
         .unwrap();
@@ -134,24 +117,19 @@ pub async fn test_challenge_auth() {
         .await
         .expect("should receive challenge");
     let challenge = match response {
-        Ok(resp) => match resp.payload {
-            Some(UserAgentResponsePayload::AuthChallenge(c)) => c,
+        Ok(resp) => match resp {
+            Response::AuthChallenge { nonce } => nonce,
             other => panic!("Expected AuthChallenge, got {other:?}"),
         },
         Err(err) => panic!("Expected Ok response, got Err({err:?})"),
     };
 
-    // Sign the challenge and send solution
-    let formatted_challenge = arbiter_proto::format_challenge(challenge.nonce, &challenge.pubkey);
+    let formatted_challenge = arbiter_proto::format_challenge(challenge, &pubkey_bytes);
     let signature = new_key.sign(&formatted_challenge);
 
     test_transport
-        .send(UserAgentRequest {
-            payload: Some(UserAgentRequestPayload::AuthChallengeSolution(
-                AuthChallengeSolution {
-                    signature: signature.to_bytes().to_vec(),
-                },
-            )),
+        .send(Request::AuthChallengeSolution {
+            signature: signature.to_bytes().to_vec(),
         })
         .await
         .unwrap();

server/crates/arbiter-server/tests/user_agent/unseal.rs

@@ -1,30 +1,23 @@
-use arbiter_proto::proto::user_agent::{
-    UnsealEncryptedKey, UnsealResult, UnsealStart, UserAgentRequest,
-    user_agent_request::Payload as UserAgentRequestPayload,
-    user_agent_response::Payload as UserAgentResponsePayload,
-};
 use arbiter_server::{
     actors::{
         GlobalActors,
         keyholder::{Bootstrap, Seal},
-        user_agent::session::UserAgentSession,
+        user_agent::{Request, Response, UnsealError, session::UserAgentSession},
     },
     db,
+    safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
-use memsafe::MemSafe;
 use x25519_dalek::{EphemeralSecret, PublicKey};
 
-async fn setup_sealed_user_agent(
-    seal_key: &[u8],
-) -> (db::DatabasePool, UserAgentSession) {
+async fn setup_sealed_user_agent(seal_key: &[u8]) -> (db::DatabasePool, UserAgentSession) {
     let db = db::create_test_pool().await;
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
 
     actors
         .key_holder
         .ask(Bootstrap {
-            seal_key_raw: MemSafe::new(seal_key.to_vec()).unwrap(),
+            seal_key_raw: SafeCell::new(seal_key.to_vec()),
         })
         .await
         .unwrap();
@@ -35,29 +28,23 @@ async fn setup_sealed_user_agent(
     (db, session)
 }
 
-async fn client_dh_encrypt(
-    user_agent: &mut UserAgentSession,
-    key_to_send: &[u8],
-) -> UnsealEncryptedKey {
+async fn client_dh_encrypt(user_agent: &mut UserAgentSession, key_to_send: &[u8]) -> Request {
     let client_secret = EphemeralSecret::random();
     let client_public = PublicKey::from(&client_secret);
 
     let response = user_agent
-        .process_transport_inbound(UserAgentRequest {
-            payload: Some(UserAgentRequestPayload::UnsealStart(UnsealStart {
-                client_pubkey: client_public.as_bytes().to_vec(),
-            })),
+        .process_transport_inbound(Request::UnsealStart {
+            client_pubkey: client_public,
         })
         .await
         .unwrap();
 
-    let server_pubkey = match response.payload.unwrap() {
-        UserAgentResponsePayload::UnsealStartResponse(resp) => resp.server_pubkey,
+    let server_pubkey = match response {
+        Response::UnsealStartResponse { server_pubkey } => server_pubkey,
         other => panic!("Expected UnsealStartResponse, got {other:?}"),
     };
-    let server_public = PublicKey::from(<[u8; 32]>::try_from(server_pubkey.as_slice()).unwrap());
 
-    let shared_secret = client_secret.diffie_hellman(&server_public);
+    let shared_secret = client_secret.diffie_hellman(&server_pubkey);
     let cipher = XChaCha20Poly1305::new(shared_secret.as_bytes().into());
     let nonce = XNonce::from([0u8; 24]);
     let associated_data = b"unseal";
@@ -66,19 +53,13 @@ async fn client_dh_encrypt(
         .encrypt_in_place(&nonce, associated_data, &mut ciphertext)
         .unwrap();
 
-    UnsealEncryptedKey {
+    Request::UnsealEncryptedKey {
         nonce: nonce.to_vec(),
         ciphertext,
         associated_data: associated_data.to_vec(),
     }
 }
 
-fn unseal_key_request(req: UnsealEncryptedKey) -> UserAgentRequest {
-    UserAgentRequest {
-        payload: Some(UserAgentRequestPayload::UnsealEncryptedKey(req)),
-    }
-}
-
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unseal_success() {
@@ -88,14 +69,11 @@ pub async fn test_unseal_success() {
     let encrypted_key = client_dh_encrypt(&mut user_agent, seal_key).await;
 
     let response = user_agent
-        .process_transport_inbound(unseal_key_request(encrypted_key))
+        .process_transport_inbound(encrypted_key)
         .await
         .unwrap();
 
-    assert_eq!(
-        response.payload.unwrap(),
-        UserAgentResponsePayload::UnsealResult(UnsealResult::Success.into()),
-    );
+    assert!(matches!(response, Response::UnsealResult(Ok(()))));
 }
 
 #[tokio::test]
@@ -106,14 +84,14 @@ pub async fn test_unseal_wrong_seal_key() {
     let encrypted_key = client_dh_encrypt(&mut user_agent, b"wrong-key").await;
 
     let response = user_agent
-        .process_transport_inbound(unseal_key_request(encrypted_key))
+        .process_transport_inbound(encrypted_key)
         .await
         .unwrap();
 
-    assert_eq!(
-        response.payload.unwrap(),
-        UserAgentResponsePayload::UnsealResult(UnsealResult::InvalidKey.into()),
-    );
+    assert!(matches!(
+        response,
+        Response::UnsealResult(Err(UnsealError::InvalidKey))
+    ));
 }
 
 #[tokio::test]
@@ -125,27 +103,25 @@ pub async fn test_unseal_corrupted_ciphertext() {
     let client_public = PublicKey::from(&client_secret);
 
     user_agent
-        .process_transport_inbound(UserAgentRequest {
-            payload: Some(UserAgentRequestPayload::UnsealStart(UnsealStart {
-                client_pubkey: client_public.as_bytes().to_vec(),
-            })),
+        .process_transport_inbound(Request::UnsealStart {
+            client_pubkey: client_public,
         })
         .await
         .unwrap();
 
     let response = user_agent
-        .process_transport_inbound(unseal_key_request(UnsealEncryptedKey {
+        .process_transport_inbound(Request::UnsealEncryptedKey {
             nonce: vec![0u8; 24],
             ciphertext: vec![0u8; 32],
             associated_data: vec![],
-        }))
+        })
         .await
         .unwrap();
 
-    assert_eq!(
-        response.payload.unwrap(),
-        UserAgentResponsePayload::UnsealResult(UnsealResult::InvalidKey.into()),
-    );
+    assert!(matches!(
+        response,
+        Response::UnsealResult(Err(UnsealError::InvalidKey))
+    ));
 }
 
 #[tokio::test]
@@ -158,27 +134,24 @@ pub async fn test_unseal_retry_after_invalid_key() {
         let encrypted_key = client_dh_encrypt(&mut user_agent, b"wrong-key").await;
 
         let response = user_agent
-            .process_transport_inbound(unseal_key_request(encrypted_key))
+            .process_transport_inbound(encrypted_key)
             .await
             .unwrap();
 
-        assert_eq!(
-            response.payload.unwrap(),
-            UserAgentResponsePayload::UnsealResult(UnsealResult::InvalidKey.into()),
-        );
+        assert!(matches!(
+            response,
+            Response::UnsealResult(Err(UnsealError::InvalidKey))
+        ));
     }
 
     {
         let encrypted_key = client_dh_encrypt(&mut user_agent, seal_key).await;
 
         let response = user_agent
-            .process_transport_inbound(unseal_key_request(encrypted_key))
+            .process_transport_inbound(encrypted_key)
             .await
             .unwrap();
 
-        assert_eq!(
-            response.payload.unwrap(),
-            UserAgentResponsePayload::UnsealResult(UnsealResult::Success.into()),
-        );
+        assert!(matches!(response, Response::UnsealResult(Ok(()))));
     }
 }

server/crates/arbiter-useragent/Cargo.toml

@@ -1,21 +0,0 @@
-[package]
-name = "arbiter-useragent"
-version = "0.1.0"
-edition = "2024"
-license = "Apache-2.0"
-
-[dependencies]
-arbiter-proto.path = "../arbiter-proto"
-kameo.workspace = true
-tokio = {workspace = true, features = ["net"]}
-tonic.workspace = true
-tonic.features = ["tls-aws-lc"]
-tracing.workspace = true
-ed25519-dalek.workspace = true
-smlang.workspace = true
-x25519-dalek.workspace = true
-thiserror.workspace = true
-tokio-stream.workspace = true
-http = "1.4.0"
-rustls-webpki = { version = "0.103.9", features = ["aws-lc-rs"] }
-async-trait.workspace = true

server/crates/arbiter-useragent/src/grpc.rs

@@ -1,72 +0,0 @@
-use arbiter_proto::{
-    proto::{
-        user_agent::{UserAgentRequest, UserAgentResponse},
-        arbiter_service_client::ArbiterServiceClient,
-    },
-    transport::{IdentityRecvConverter, IdentitySendConverter, grpc},
-    url::ArbiterUrl,
-};
-use ed25519_dalek::SigningKey;
-use kameo::actor::{ActorRef, Spawn};
-
-use tokio::sync::mpsc;
-use tokio_stream::wrappers::ReceiverStream;
-
-use tonic::transport::ClientTlsConfig;
-
-
-#[derive(Debug, thiserror::Error)]
-pub enum ConnectError {
-    #[error("Could establish connection")]
-    Connection(#[from] tonic::transport::Error),
-
-    #[error("Invalid server URI")]
-    InvalidUri(#[from] http::uri::InvalidUri),
-
-    #[error("Invalid CA certificate")]
-    InvalidCaCert(#[from] webpki::Error),
-
-    #[error("gRPC error")]
-    Grpc(#[from] tonic::Status),
-}
-
-    use super::UserAgentActor;
-
-pub type UserAgentGrpc = ActorRef<
-    UserAgentActor<
-        grpc::GrpcAdapter<
-            IdentityRecvConverter<UserAgentResponse>,
-            IdentitySendConverter<UserAgentRequest>,
-        >,
-    >,
->;
-pub async fn connect_grpc(
-    url: ArbiterUrl,
-    key: SigningKey,
-) -> Result<UserAgentGrpc, ConnectError> {
-    let bootstrap_token = url.bootstrap_token.clone();
-    let anchor = webpki::anchor_from_trusted_cert(&url.ca_cert)?.to_owned();
-    let tls = ClientTlsConfig::new().trust_anchor(anchor);
-
-    // TODO: if `host` is localhost, we need to verify server's process authenticity
-    let channel = tonic::transport::Channel::from_shared(format!("{}:{}", url.host, url.port))?
-        .tls_config(tls)?
-        .connect()
-        .await?;
-
-    let mut client = ArbiterServiceClient::new(channel);
-    let (tx, rx) = mpsc::channel(16);
-    let bistream = client.user_agent(ReceiverStream::new(rx)).await?;
-    let bistream = bistream.into_inner();
-
-    let adapter = grpc::GrpcAdapter::new(
-        tx,
-        bistream,
-        IdentityRecvConverter::new(),
-        IdentitySendConverter::new(),
-    );
-
-    let actor = UserAgentActor::spawn(UserAgentActor::new(key, bootstrap_token, adapter));
-
-    Ok(actor)
-}

server/crates/arbiter-useragent/src/lib.rs

@@ -1,195 +0,0 @@
-use arbiter_proto::{
-    format_challenge,
-    proto::user_agent::{
-        AuthChallengeRequest, AuthChallengeSolution, AuthOk,
-        UserAgentRequest, UserAgentResponse,
-        user_agent_request::Payload as UserAgentRequestPayload,
-        user_agent_response::Payload as UserAgentResponsePayload,
-    },
-    transport::Bi,
-};
-use ed25519_dalek::{Signer, SigningKey};
-use kameo::{Actor, actor::ActorRef};
-use smlang::statemachine;
-use tokio::select;
-use tracing::{error, info};
-
-statemachine! {
-    name: UserAgent,
-    custom_error: false,
-    transitions: {
-        *Init + SentAuthChallengeRequest = WaitingForServerAuth,
-        WaitingForServerAuth + ReceivedAuthChallenge = WaitingForAuthOk,
-        WaitingForServerAuth + ReceivedAuthOk = Authenticated,
-        WaitingForAuthOk + ReceivedAuthOk = Authenticated,
-    }
-}
-
-pub struct DummyContext;
-impl UserAgentStateMachineContext for DummyContext {}
-
-#[derive(Debug, thiserror::Error)]
-pub enum InboundError {
-    #[error("Invalid user agent response")]
-    InvalidResponse,
-    #[error("Expected response payload")]
-    MissingResponsePayload,
-    #[error("Unexpected response payload")]
-    UnexpectedResponsePayload,
-    #[error("Invalid state for auth challenge")]
-    InvalidStateForAuthChallenge,
-    #[error("Invalid state for auth ok")]
-    InvalidStateForAuthOk,
-    #[error("State machine error")]
-    StateTransitionFailed,
-    #[error("Transport send failed")]
-    TransportSendFailed,
-}
-
-pub struct UserAgentActor<Transport>
-where
-    Transport: Bi<UserAgentResponse, UserAgentRequest>,
-{
-    key: SigningKey,
-    bootstrap_token: Option<String>,
-    state: UserAgentStateMachine<DummyContext>,
-    transport: Transport,
-}
-
-impl<Transport> UserAgentActor<Transport>
-where
-    Transport: Bi<UserAgentResponse, UserAgentRequest>,
-{
-    pub fn new(key: SigningKey, bootstrap_token: Option<String>, transport: Transport) -> Self {
-        Self {
-            key,
-            bootstrap_token,
-            state: UserAgentStateMachine::new(DummyContext),
-            transport,
-        }
-    }
-
-    fn transition(&mut self, event: UserAgentEvents) -> Result<(), InboundError> {
-        self.state.process_event(event).map_err(|e| {
-            error!(?e, "useragent state transition failed");
-            InboundError::StateTransitionFailed
-        })?;
-        Ok(())
-    }
-
-    async fn send_auth_challenge_request(&mut self) -> Result<(), InboundError> {
-        let req = AuthChallengeRequest {
-            pubkey: self.key.verifying_key().to_bytes().to_vec(),
-            bootstrap_token: self.bootstrap_token.take(),
-        };
-
-        self.transition(UserAgentEvents::SentAuthChallengeRequest)?;
-
-        self.transport
-            .send(UserAgentRequest {
-                payload: Some(UserAgentRequestPayload::AuthChallengeRequest(req)),
-            })
-            .await
-            .map_err(|_| InboundError::TransportSendFailed)?;
-
-        info!(actor = "useragent", "auth.request.sent");
-        Ok(())
-    }
-
-    async fn handle_auth_challenge(
-        &mut self,
-        challenge: arbiter_proto::proto::user_agent::AuthChallenge,
-    ) -> Result<(), InboundError> {
-        self.transition(UserAgentEvents::ReceivedAuthChallenge)?;
-
-        let formatted = format_challenge(challenge.nonce, &challenge.pubkey);
-        let signature = self.key.sign(&formatted);
-        let solution = AuthChallengeSolution {
-            signature: signature.to_bytes().to_vec(),
-        };
-
-        self.transport
-            .send(UserAgentRequest {
-                payload: Some(UserAgentRequestPayload::AuthChallengeSolution(solution)),
-            })
-            .await
-            .map_err(|_| InboundError::TransportSendFailed)?;
-
-        info!(actor = "useragent", "auth.solution.sent");
-        Ok(())
-    }
-
-    fn handle_auth_ok(&mut self, _ok: AuthOk) -> Result<(), InboundError> {
-        self.transition(UserAgentEvents::ReceivedAuthOk)?;
-        info!(actor = "useragent", "auth.ok");
-        Ok(())
-    }
-
-    pub async fn process_inbound_transport(
-        &mut self,
-        inbound: UserAgentResponse
-    ) -> Result<(), InboundError> {
-        let payload = inbound
-            .payload
-            .ok_or(InboundError::MissingResponsePayload)?;
-
-        match payload {
-            UserAgentResponsePayload::AuthChallenge(challenge) => {
-                self.handle_auth_challenge(challenge).await
-            }
-            UserAgentResponsePayload::AuthOk(ok) => self.handle_auth_ok(ok),
-            _ => Err(InboundError::UnexpectedResponsePayload),
-        }
-    }
-}
-
-impl<Transport> Actor for UserAgentActor<Transport>
-where
-    Transport: Bi<UserAgentResponse, UserAgentRequest>,
-{
-    type Args = Self;
-
-    type Error = ();
-
-    async fn on_start(
-        mut args: Self::Args,
-        _actor_ref: ActorRef<Self>,
-    ) -> Result<Self, Self::Error> {
-        if let Err(err) = args.send_auth_challenge_request().await {
-            error!(?err, actor = "useragent", "auth.start.failed");
-            return Err(());
-        }
-        Ok(args)
-    }
-
-    async fn next(
-        &mut self,
-        _actor_ref: kameo::prelude::WeakActorRef<Self>,
-        mailbox_rx: &mut kameo::prelude::MailboxReceiver<Self>,
-    ) -> Option<kameo::mailbox::Signal<Self>> {
-        loop {
-            select! {
-                signal = mailbox_rx.recv() => {
-                    return signal;
-                }
-                inbound = self.transport.recv() => {
-                    match inbound {
-                        Some(inbound) => {
-                            if let Err(err) = self.process_inbound_transport(inbound).await {
-                                error!(?err, actor = "useragent", "transport.inbound.failed");
-                                return Some(kameo::mailbox::Signal::Stop);
-                            }
-                        }
-                        None => {
-                            info!(actor = "useragent", "transport.closed");
-                            return Some(kameo::mailbox::Signal::Stop);
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
-mod grpc;
-pub use grpc::{connect_grpc, ConnectError};

server/crates/arbiter-useragent/tests/auth.rs

@@ -1,141 +0,0 @@
-use arbiter_proto::{
-    format_challenge,
-    proto::user_agent::{
-        AuthChallenge, AuthOk,
-        UserAgentRequest, UserAgentResponse,
-        user_agent_request::Payload as UserAgentRequestPayload,
-        user_agent_response::Payload as UserAgentResponsePayload,
-    },
-    transport::Bi,
-};
-use arbiter_useragent::UserAgentActor;
-use ed25519_dalek::SigningKey;
-use kameo::actor::Spawn;
-use tokio::sync::mpsc;
-use tokio::time::{Duration, timeout};
-use async_trait::async_trait;
-
-struct TestTransport {
-    inbound_rx: mpsc::Receiver<UserAgentResponse>,
-    outbound_tx: mpsc::Sender<UserAgentRequest>,
-}
-
-#[async_trait]
-impl Bi<UserAgentResponse, UserAgentRequest> for TestTransport {
-    async fn send(&mut self, item: UserAgentRequest) -> Result<(), arbiter_proto::transport::Error> {
-        self.outbound_tx
-            .send(item)
-            .await
-            .map_err(|_| arbiter_proto::transport::Error::ChannelClosed)
-    }
-
-    async fn recv(&mut self) -> Option<UserAgentResponse> {
-        self.inbound_rx.recv().await
-    }
-}
-
-fn make_transport() -> (
-    TestTransport,
-    mpsc::Sender<UserAgentResponse>,
-    mpsc::Receiver<UserAgentRequest>,
-) {
-    let (inbound_tx, inbound_rx) = mpsc::channel(8);
-    let (outbound_tx, outbound_rx) = mpsc::channel(8);
-    (
-        TestTransport {
-            inbound_rx,
-            outbound_tx,
-        },
-        inbound_tx,
-        outbound_rx,
-    )
-}
-
-fn test_key() -> SigningKey {
-    SigningKey::from_bytes(&[7u8; 32])
-}
-
-#[tokio::test]
-async fn sends_auth_request_on_start_with_bootstrap_token() {
-    let key = test_key();
-    let pubkey = key.verifying_key().to_bytes().to_vec();
-    let bootstrap_token = Some("bootstrap-123".to_string());
-    let (transport, inbound_tx, mut outbound_rx) = make_transport();
-
-    let actor = UserAgentActor::spawn(UserAgentActor::new(key, bootstrap_token.clone(), transport));
-
-    let outbound = timeout(Duration::from_secs(1), outbound_rx.recv())
-        .await
-        .expect("timed out waiting for auth request")
-        .expect("channel closed before auth request");
-
-    let UserAgentRequest {
-        payload: Some(UserAgentRequestPayload::AuthChallengeRequest(req)),
-    } = outbound
-    else {
-        panic!("expected auth challenge request");
-    };
-
-    assert_eq!(req.pubkey, pubkey);
-    assert_eq!(req.bootstrap_token, bootstrap_token);
-
-    drop(inbound_tx);
-    drop(actor);
-}
-
-#[tokio::test]
-async fn challenge_flow_sends_solution_from_transport_inbound() {
-    let key = test_key();
-    let verify_key = key.verifying_key();
-    let (transport, inbound_tx, mut outbound_rx) = make_transport();
-
-    let actor = UserAgentActor::spawn(UserAgentActor::new(key, None, transport));
-
-    let _initial_auth_request = timeout(Duration::from_secs(1), outbound_rx.recv())
-        .await
-        .expect("timed out waiting for initial auth request")
-        .expect("missing initial auth request");
-
-    let challenge = AuthChallenge {
-        pubkey: verify_key.to_bytes().to_vec(),
-        nonce: 42,
-    };
-    inbound_tx
-        .send(UserAgentResponse {
-            payload: Some(UserAgentResponsePayload::AuthChallenge(challenge.clone())),
-        })
-        .await
-        .unwrap();
-
-    let outbound = timeout(Duration::from_secs(1), outbound_rx.recv())
-        .await
-        .expect("timed out waiting for challenge solution")
-        .expect("missing challenge solution");
-
-    let UserAgentRequest {
-        payload: Some(UserAgentRequestPayload::AuthChallengeSolution(solution)),
-    } = outbound
-    else {
-        panic!("expected auth challenge solution");
-    };
-
-    let formatted = format_challenge(challenge.nonce, &challenge.pubkey);
-    let sig: ed25519_dalek::Signature = solution
-        .signature
-        .as_slice()
-        .try_into()
-        .expect("signature bytes length");
-    verify_key
-        .verify_strict(&formatted, &sig)
-        .expect("solution signature should verify");
-
-    inbound_tx
-        .send(UserAgentResponse {
-            payload: Some(UserAgentResponsePayload::AuthOk(AuthOk {})),
-        })
-        .await
-        .unwrap();
-
-    drop(inbound_tx);
-    drop(actor);
-}

server/rules/safecell/new-inline.yaml

@@ -0,0 +1,10 @@
+id: safecell-new-inline
+language: Rust
+rule:
+  pattern: $CELL.write_inline(|$W| $BODY);
+  follows:
+    pattern: let mut $CELL = SafeCell::new($INIT);
+fix: 
+  template: let mut $CELL = SafeCell::new_inline(|$W| $BODY);
+  expandStart:
+    pattern: let mut $CELL = SafeCell::new($INIT)

server/rules/safecell/read-inline.yaml

@@ -0,0 +1,17 @@
+id: safecell-read-inline
+language: Rust
+rule:
+  pattern: 
+    context: |
+      {
+          let $READ = $CELL.read();
+          $$$BODY
+      }
+    selector: block
+  inside:
+    kind: block
+fix: 
+  template: | 
+    $CELL.read_inline(|$READ| { 
+      $$$BODY 
+    });

server/rules/safecell/write-inline.yaml

@@ -0,0 +1,13 @@
+id: safecell-write-inline
+language: Rust
+rule:
+  pattern: |
+    {
+        let mut $WRITE = $CELL.write();
+        $$$BODY
+    }
+fix: 
+  template: | 
+    $CELL.write_inline(|$WRITE| { 
+      $$$BODY 
+    });

server/sgconfig.yml

@@ -0,0 +1,2 @@
+ruleDirs:
+- ./rules

server/supply-chain/audits.toml

@@ -1,6 +1,41 @@
 
 # cargo-vet audits file
 
+[[audits.alloy-primitives]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-deploy"
+version = "1.5.7"
+
+[[audits.console]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-deploy"
+version = "0.15.11"
+
+[[audits.encode_unicode]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-deploy"
+version = "0.3.6"
+
+[[audits.futures-timer]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-run"
+version = "3.0.3"
+
+[[audits.insta]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-run"
+version = "1.46.3"
+
+[[audits.pin-project]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-deploy"
+version = "0.2.16"
+
+[[audits.protoc-bin-vendored]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-deploy"
+version = "3.2.0"
+
 [[audits.similar]]
 who = "hdbg <httpdebugger@protonmail.com>"
 criteria = "safe-to-deploy"
@@ -16,11 +51,214 @@ who = "hdbg <httpdebugger@protonmail.com>"
 criteria = "safe-to-deploy"
 delta = "0.2.18 -> 0.2.19"
 
+[[audits.wasm-bindgen]]
+who = "CleverWild <cleverwilddev@gmail.com>"
+criteria = "safe-to-deploy"
+delta = "0.2.100 -> 0.2.114"
+
+[[trusted.addr2line]]
+criteria = "safe-to-deploy"
+user-id = 4415 # Philip Craig (philipc)
+start = "2019-05-01"
+end = "2027-03-14"
+
+[[trusted.aho-corasick]]
+criteria = "safe-to-deploy"
+user-id = 189 # Andrew Gallant (BurntSushi)
+start = "2019-03-28"
+end = "2027-03-14"
+
+[[trusted.anyhow]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-10-05"
+end = "2027-03-14"
+
+[[trusted.async-stream]]
+criteria = "safe-to-deploy"
+user-id = 10 # Carl Lerche (carllerche)
+start = "2019-06-07"
+end = "2027-03-14"
+
+[[trusted.async-stream]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2021-04-21"
+end = "2027-03-14"
+
+[[trusted.async-stream-impl]]
+criteria = "safe-to-deploy"
+user-id = 10 # Carl Lerche (carllerche)
+start = "2019-08-13"
+end = "2027-03-14"
+
+[[trusted.async-stream-impl]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2021-04-21"
+end = "2027-03-14"
+
+[[trusted.async-trait]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-07-23"
+end = "2027-03-14"
+
+[[trusted.auto_impl]]
+criteria = "safe-to-deploy"
+user-id = 3204 # Ashley Mannix (KodrAus)
+start = "2022-06-01"
+end = "2027-03-14"
+
+[[trusted.aws-lc-rs]]
+criteria = "safe-to-deploy"
+user-id = 156764 # Justin W Smith (justsmth)
+start = "2023-04-11"
+end = "2027-03-14"
+
+[[trusted.aws-lc-sys]]
+criteria = "safe-to-deploy"
+user-id = 156764 # Justin W Smith (justsmth)
+start = "2022-11-09"
+end = "2027-03-14"
+
+[[trusted.backtrace]]
+criteria = "safe-to-deploy"
+user-id = 55123 # rust-lang-owner
+start = "2025-05-06"
+end = "2027-03-14"
+
+[[trusted.bitflags]]
+criteria = "safe-to-deploy"
+user-id = 3204 # Ashley Mannix (KodrAus)
+start = "2019-05-02"
+end = "2027-03-14"
+
+[[trusted.bytes]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-11-27"
+end = "2027-03-14"
+
+[[trusted.bytes]]
+criteria = "safe-to-deploy"
+user-id = 6741 # Alice Ryhl (Darksonn)
+start = "2021-01-11"
+end = "2027-03-14"
+
 [[trusted.cc]]
 criteria = "safe-to-deploy"
 user-id = 55123 # rust-lang-owner
 start = "2022-10-29"
-end = "2027-02-16"
+end = "2027-03-14"
+
+[[trusted.cmake]]
+criteria = "safe-to-deploy"
+user-id = 55123 # rust-lang-owner
+start = "2022-10-29"
+end = "2027-03-14"
+
+[[trusted.crossbeam-utils]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-12"
+end = "2027-03-14"
+
+[[trusted.derive_more]]
+criteria = "safe-to-deploy"
+user-id = 3797 # Jelte Fennema-Nio (JelteF)
+start = "2019-05-25"
+end = "2027-03-14"
+
+[[trusted.derive_more-impl]]
+criteria = "safe-to-deploy"
+user-id = 3797 # Jelte Fennema-Nio (JelteF)
+start = "2023-07-23"
+end = "2027-03-14"
+
+[[trusted.dyn-clone]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-12-23"
+end = "2027-03-14"
+
+[[trusted.ff]]
+criteria = "safe-to-deploy"
+user-id = 6289 # Jack Grigg (str4d)
+start = "2021-08-11"
+end = "2027-03-14"
+
+[[trusted.find-msvc-tools]]
+criteria = "safe-to-deploy"
+user-id = 539 # Josh Stone (cuviper)
+start = "2025-08-29"
+end = "2027-03-14"
+
+[[trusted.flate2]]
+criteria = "safe-to-deploy"
+user-id = 980 # Sebastian Thiel (Byron)
+start = "2023-08-15"
+end = "2027-03-14"
+
+[[trusted.futures]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.futures-channel]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.futures-core]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.futures-executor]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.futures-io]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.futures-macro]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.futures-sink]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.futures-task]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2019-07-29"
+end = "2027-03-14"
+
+[[trusted.futures-util]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2020-10-05"
+end = "2027-03-14"
+
+[[trusted.group]]
+criteria = "safe-to-deploy"
+user-id = 1244 # ebfull
+start = "2019-10-08"
+end = "2027-03-14"
 
 [[trusted.h2]]
 criteria = "safe-to-deploy"
@@ -28,36 +266,372 @@ user-id = 359 # Sean McArthur (seanmonstar)
 start = "2019-03-13"
 end = "2027-02-14"
 
+[[trusted.hashbrown]]
+criteria = "safe-to-deploy"
+user-id = 2915 # Amanieu d'Antras (Amanieu)
+start = "2019-04-02"
+end = "2027-03-14"
+
 [[trusted.hashbrown]]
 criteria = "safe-to-deploy"
 user-id = 55123 # rust-lang-owner
 start = "2025-04-30"
 end = "2027-02-14"
 
+[[trusted.http]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-04-05"
+end = "2027-03-14"
+
+[[trusted.http-body-util]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2022-10-25"
+end = "2027-03-14"
+
+[[trusted.httparse]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-07-03"
+end = "2027-03-14"
+
+[[trusted.hyper]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-03-01"
+end = "2027-03-14"
+
 [[trusted.hyper-util]]
 criteria = "safe-to-deploy"
 user-id = 359 # Sean McArthur (seanmonstar)
 start = "2022-01-15"
 end = "2027-02-14"
 
+[[trusted.id-arena]]
+criteria = "safe-to-deploy"
+user-id = 696 # Nick Fitzgerald (fitzgen)
+start = "2026-01-14"
+end = "2027-03-14"
+
+[[trusted.indexmap]]
+criteria = "safe-to-deploy"
+user-id = 539 # Josh Stone (cuviper)
+start = "2020-01-15"
+end = "2027-03-14"
+
+[[trusted.itoa]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-05-02"
+end = "2027-03-14"
+
+[[trusted.jobserver]]
+criteria = "safe-to-deploy"
+user-id = 55123 # rust-lang-owner
+start = "2024-07-23"
+end = "2027-03-14"
+
+[[trusted.js-sys]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2019-03-04"
+end = "2027-03-14"
+
 [[trusted.libc]]
 criteria = "safe-to-deploy"
 user-id = 55123 # rust-lang-owner
 start = "2024-08-15"
 end = "2027-02-16"
 
+[[trusted.libm]]
+criteria = "safe-to-deploy"
+user-id = 55123 # rust-lang-owner
+start = "2024-10-26"
+end = "2027-03-14"
+
+[[trusted.linux-raw-sys]]
+criteria = "safe-to-deploy"
+user-id = 6825 # Dan Gohman (sunfishcode)
+start = "2021-06-12"
+end = "2027-03-14"
+
+[[trusted.lock_api]]
+criteria = "safe-to-deploy"
+user-id = 2915 # Amanieu d'Antras (Amanieu)
+start = "2019-05-04"
+end = "2027-03-14"
+
+[[trusted.log]]
+criteria = "safe-to-deploy"
+user-id = 3204 # Ashley Mannix (KodrAus)
+start = "2019-07-10"
+end = "2027-03-14"
+
+[[trusted.macro-string]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2025-02-02"
+end = "2027-03-14"
+
+[[trusted.memchr]]
+criteria = "safe-to-deploy"
+user-id = 189 # Andrew Gallant (BurntSushi)
+start = "2019-07-07"
+end = "2027-03-14"
+
+[[trusted.mime]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-09-09"
+end = "2027-03-14"
+
+[[trusted.mio]]
+criteria = "safe-to-deploy"
+user-id = 6025 # Thomas de Zeeuw (Thomasdezeeuw)
+start = "2019-12-17"
+end = "2027-03-14"
+
+[[trusted.num-bigint]]
+criteria = "safe-to-deploy"
+user-id = 539 # Josh Stone (cuviper)
+start = "2019-09-04"
+end = "2027-03-14"
+
+[[trusted.num_cpus]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-06-10"
+end = "2027-03-14"
+
+[[trusted.object]]
+criteria = "safe-to-deploy"
+user-id = 4415 # Philip Craig (philipc)
+start = "2019-04-26"
+end = "2027-03-14"
+
+[[trusted.parking_lot]]
+criteria = "safe-to-deploy"
+user-id = 2915 # Amanieu d'Antras (Amanieu)
+start = "2019-05-04"
+end = "2027-03-14"
+
+[[trusted.parking_lot_core]]
+criteria = "safe-to-deploy"
+user-id = 2915 # Amanieu d'Antras (Amanieu)
+start = "2019-05-04"
+end = "2027-03-14"
+
+[[trusted.paste]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-03-19"
+end = "2027-03-14"
+
+[[trusted.pin-project]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2019-03-02"
+end = "2027-03-14"
+
+[[trusted.pin-project-internal]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2019-08-11"
+end = "2027-03-14"
+
+[[trusted.pin-project-lite]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2019-10-22"
+end = "2027-03-14"
+
+[[trusted.portable-atomic]]
+criteria = "safe-to-deploy"
+user-id = 33035 # Taiki Endo (taiki-e)
+start = "2022-02-24"
+end = "2027-03-14"
+
+[[trusted.prettyplease]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2022-01-04"
+end = "2027-03-14"
+
+[[trusted.proc-macro2]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-04-23"
+end = "2027-03-14"
+
+[[trusted.prost]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2021-07-08"
+end = "2027-03-14"
+
+[[trusted.prost-build]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2021-07-08"
+end = "2027-03-14"
+
+[[trusted.prost-derive]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2021-07-08"
+end = "2027-03-14"
+
+[[trusted.prost-types]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2021-07-08"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-linux-aarch_64]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2022-02-07"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-linux-ppcle_64]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2022-02-07"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-linux-s390_64]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2025-07-21"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-linux-x86_32]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2022-02-07"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-linux-x86_64]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2022-02-07"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-macos-aarch_64]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2024-09-30"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-macos-x86_64]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2022-02-07"
+end = "2027-03-14"
+
+[[trusted.protoc-bin-vendored-win32]]
+criteria = "safe-to-deploy"
+user-id = 220 # Stepan Koltsov (stepancheg)
+start = "2022-02-07"
+end = "2027-03-14"
+
+[[trusted.pulldown-cmark-to-cmark]]
+criteria = "safe-to-deploy"
+user-id = 980 # Sebastian Thiel (Byron)
+start = "2019-07-03"
+end = "2027-03-14"
+
+[[trusted.quote]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-04-09"
+end = "2027-03-14"
+
+[[trusted.ref-cast]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-05-05"
+end = "2027-03-14"
+
+[[trusted.ref-cast-impl]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-05-05"
+end = "2027-03-14"
+
+[[trusted.regex]]
+criteria = "safe-to-deploy"
+user-id = 189 # Andrew Gallant (BurntSushi)
+start = "2019-02-27"
+end = "2027-03-14"
+
+[[trusted.regex-automata]]
+criteria = "safe-to-deploy"
+user-id = 189 # Andrew Gallant (BurntSushi)
+start = "2019-02-25"
+end = "2027-03-14"
+
+[[trusted.regex-syntax]]
+criteria = "safe-to-deploy"
+user-id = 189 # Andrew Gallant (BurntSushi)
+start = "2019-03-30"
+end = "2027-03-14"
+
+[[trusted.reqwest]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-03-04"
+end = "2027-03-14"
+
+[[trusted.rustc-demangle]]
+criteria = "safe-to-deploy"
+user-id = 55123 # rust-lang-owner
+start = "2023-03-23"
+end = "2027-03-14"
+
 [[trusted.rustix]]
 criteria = "safe-to-deploy"
 user-id = 6825 # Dan Gohman (sunfishcode)
 start = "2021-10-29"
 end = "2027-02-14"
 
+[[trusted.ryu]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2019-05-02"
+end = "2027-03-14"
+
+[[trusted.scopeguard]]
+criteria = "safe-to-deploy"
+user-id = 2915 # Amanieu d'Antras (Amanieu)
+start = "2020-02-16"
+end = "2027-03-14"
+
+[[trusted.semver]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2021-05-25"
+end = "2027-03-14"
+
 [[trusted.serde_json]]
 criteria = "safe-to-deploy"
 user-id = 3618 # David Tolnay (dtolnay)
 start = "2019-02-28"
 end = "2027-02-14"
 
+[[trusted.slab]]
+criteria = "safe-to-deploy"
+user-id = 6741 # Alice Ryhl (Darksonn)
+start = "2021-10-13"
+end = "2027-03-14"
+
+[[trusted.socket2]]
+criteria = "safe-to-deploy"
+user-id = 6025 # Thomas de Zeeuw (Thomasdezeeuw)
+start = "2020-09-09"
+end = "2027-03-14"
+
 [[trusted.syn]]
 criteria = "safe-to-deploy"
 user-id = 3618 # David Tolnay (dtolnay)
@@ -70,26 +644,350 @@ user-id = 2915 # Amanieu d'Antras (Amanieu)
 start = "2019-09-07"
 end = "2027-02-16"
 
+[[trusted.time]]
+criteria = "safe-to-deploy"
+user-id = 15682 # Jacob Pratt (jhpratt)
+start = "2019-12-19"
+end = "2027-03-14"
+
+[[trusted.tinystr]]
+criteria = "safe-to-deploy"
+user-id = 1139 # Manish Goregaokar (Manishearth)
+start = "2021-01-14"
+end = "2027-03-14"
+
+[[trusted.tokio]]
+criteria = "safe-to-deploy"
+user-id = 6741 # Alice Ryhl (Darksonn)
+start = "2020-12-25"
+end = "2027-03-14"
+
+[[trusted.tokio-macros]]
+criteria = "safe-to-deploy"
+user-id = 6741 # Alice Ryhl (Darksonn)
+start = "2020-10-26"
+end = "2027-03-14"
+
+[[trusted.tokio-stream]]
+criteria = "safe-to-deploy"
+user-id = 6741 # Alice Ryhl (Darksonn)
+start = "2021-01-04"
+end = "2027-03-14"
+
+[[trusted.tokio-util]]
+criteria = "safe-to-deploy"
+user-id = 6741 # Alice Ryhl (Darksonn)
+start = "2021-01-12"
+end = "2027-03-14"
+
 [[trusted.toml]]
 criteria = "safe-to-deploy"
 user-id = 6743 # Ed Page (epage)
 start = "2022-12-14"
 end = "2027-02-16"
 
+[[trusted.toml_datetime]]
+criteria = "safe-to-deploy"
+user-id = 6743 # Ed Page (epage)
+start = "2022-10-21"
+end = "2027-03-14"
+
+[[trusted.toml_edit]]
+criteria = "safe-to-deploy"
+user-id = 6743 # Ed Page (epage)
+start = "2021-09-13"
+end = "2027-03-14"
+
 [[trusted.toml_parser]]
 criteria = "safe-to-deploy"
 user-id = 6743 # Ed Page (epage)
 start = "2025-07-08"
 end = "2027-02-16"
 
+[[trusted.tonic]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2019-10-02"
+end = "2027-03-14"
+
 [[trusted.tonic-build]]
 criteria = "safe-to-deploy"
-user-id = 10
+user-id = 10 # Carl Lerche (carllerche)
 start = "2019-09-10"
-end = "2027-02-16"
+end = "2027-03-14"
+
+[[trusted.tonic-build]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2019-10-02"
+end = "2027-03-14"
+
+[[trusted.tonic-prost]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2025-07-28"
+end = "2027-03-14"
+
+[[trusted.tonic-prost-build]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2025-07-28"
+end = "2027-03-14"
+
+[[trusted.tower]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2024-09-09"
+end = "2027-03-14"
+
+[[trusted.tower-http]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2024-09-23"
+end = "2027-03-14"
+
+[[trusted.tower-layer]]
+criteria = "safe-to-deploy"
+user-id = 10 # Carl Lerche (carllerche)
+start = "2019-04-27"
+end = "2027-03-14"
+
+[[trusted.tower-layer]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2019-09-11"
+end = "2027-03-14"
+
+[[trusted.tower-service]]
+criteria = "safe-to-deploy"
+user-id = 3959 # Lucio Franco (LucioFranco)
+start = "2019-08-20"
+end = "2027-03-14"
+
+[[trusted.tracing-subscriber]]
+criteria = "safe-to-deploy"
+user-id = 10 # Carl Lerche (carllerche)
+start = "2025-08-29"
+end = "2027-03-14"
+
+[[trusted.ucd-trie]]
+criteria = "safe-to-deploy"
+user-id = 189 # Andrew Gallant (BurntSushi)
+start = "2019-07-21"
+end = "2027-03-14"
+
+[[trusted.unicase]]
+criteria = "safe-to-deploy"
+user-id = 359 # Sean McArthur (seanmonstar)
+start = "2019-03-05"
+end = "2027-03-14"
+
+[[trusted.unicode-ident]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2021-10-02"
+end = "2027-03-14"
+
+[[trusted.url]]
+criteria = "safe-to-deploy"
+user-id = 1139 # Manish Goregaokar (Manishearth)
+start = "2021-02-18"
+end = "2027-03-14"
+
+[[trusted.uuid]]
+criteria = "safe-to-deploy"
+user-id = 3204 # Ashley Mannix (KodrAus)
+start = "2019-10-18"
+end = "2027-03-14"
+
+[[trusted.valuable]]
+criteria = "safe-to-deploy"
+user-id = 10 # Carl Lerche (carllerche)
+start = "2022-01-03"
+end = "2027-03-14"
+
+[[trusted.wait-timeout]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2025-02-03"
+end = "2027-03-14"
+
+[[trusted.wasi]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2020-06-03"
+end = "2027-03-14"
+
+[[trusted.wasi]]
+criteria = "safe-to-deploy"
+user-id = 6825 # Dan Gohman (sunfishcode)
+start = "2019-07-22"
+end = "2027-03-14"
+
+[[trusted.wasm-bindgen]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2019-03-04"
+end = "2027-03-14"
+
+[[trusted.wasm-bindgen-futures]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2019-03-04"
+end = "2027-03-14"
+
+[[trusted.wasm-bindgen-macro]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2019-03-04"
+end = "2027-03-14"
+
+[[trusted.wasm-bindgen-macro-support]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2019-03-04"
+end = "2027-03-14"
+
+[[trusted.wasm-bindgen-shared]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2019-03-04"
+end = "2027-03-14"
+
+[[trusted.web-sys]]
+criteria = "safe-to-deploy"
+user-id = 1 # Alex Crichton (alexcrichton)
+start = "2019-03-04"
+end = "2027-03-14"
+
+[[trusted.windows-core]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2021-11-15"
+end = "2027-03-14"
+
+[[trusted.windows-implement]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2022-01-27"
+end = "2027-03-14"
+
+[[trusted.windows-interface]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2022-02-18"
+end = "2027-03-14"
+
+[[trusted.windows-result]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2024-02-02"
+end = "2027-03-14"
+
+[[trusted.windows-strings]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2024-02-02"
+end = "2027-03-14"
 
 [[trusted.windows-sys]]
 criteria = "safe-to-deploy"
 user-id = 64539 # Kenny Kerr (kennykerr)
 start = "2021-11-15"
 end = "2027-02-16"
+
+[[trusted.windows-targets]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2022-09-09"
+end = "2027-03-14"
+
+[[trusted.windows_aarch64_gnullvm]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2022-09-01"
+end = "2027-03-14"
+
+[[trusted.windows_aarch64_msvc]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2021-11-05"
+end = "2027-03-14"
+
+[[trusted.windows_i686_gnu]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2021-10-28"
+end = "2027-03-14"
+
+[[trusted.windows_i686_gnullvm]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2024-04-02"
+end = "2027-03-14"
+
+[[trusted.windows_i686_msvc]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2021-10-27"
+end = "2027-03-14"
+
+[[trusted.windows_x86_64_gnu]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2021-10-28"
+end = "2027-03-14"
+
+[[trusted.windows_x86_64_gnullvm]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2022-09-01"
+end = "2027-03-14"
+
+[[trusted.windows_x86_64_msvc]]
+criteria = "safe-to-deploy"
+user-id = 64539 # Kenny Kerr (kennykerr)
+start = "2021-10-27"
+end = "2027-03-14"
+
+[[trusted.winnow]]
+criteria = "safe-to-deploy"
+user-id = 6743 # Ed Page (epage)
+start = "2023-02-22"
+end = "2027-03-14"
+
+[[trusted.yoke]]
+criteria = "safe-to-deploy"
+user-id = 1139 # Manish Goregaokar (Manishearth)
+start = "2021-05-01"
+end = "2027-03-14"
+
+[[trusted.zerocopy]]
+criteria = "safe-to-deploy"
+user-id = 7178 # Joshua Liebow-Feeser (joshlf)
+start = "2019-02-28"
+end = "2027-03-14"
+
+[[trusted.zerocopy-derive]]
+criteria = "safe-to-deploy"
+user-id = 7178 # Joshua Liebow-Feeser (joshlf)
+start = "2019-02-28"
+end = "2027-03-14"
+
+[[trusted.zerotrie]]
+criteria = "safe-to-deploy"
+user-id = 1139 # Manish Goregaokar (Manishearth)
+start = "2023-10-03"
+end = "2027-03-14"
+
+[[trusted.zerovec]]
+criteria = "safe-to-deploy"
+user-id = 1139 # Manish Goregaokar (Manishearth)
+start = "2021-04-19"
+end = "2027-03-14"
+
+[[trusted.zmij]]
+criteria = "safe-to-deploy"
+user-id = 3618 # David Tolnay (dtolnay)
+start = "2025-12-18"
+end = "2027-03-14"

server/supply-chain/config.toml

@@ -4,30 +4,27 @@
 [cargo-vet]
 version = "0.10"
 
+[imports.OpenDevicePartnership]
+url = "https://raw.githubusercontent.com/OpenDevicePartnership/rust-crate-audits/refs/heads/main/audits.toml"
+
 [imports.bytecode-alliance]
 url = "https://raw.githubusercontent.com/bytecodealliance/wasmtime/main/supply-chain/audits.toml"
 
+[imports.embark-studios]
+url = "https://raw.githubusercontent.com/EmbarkStudios/rust-ecosystem/main/audits.toml"
+
 [imports.google]
 url = "https://raw.githubusercontent.com/google/supply-chain/main/audits.toml"
 
+[imports.isrg]
+url = "https://raw.githubusercontent.com/divviup/libprio-rs/main/supply-chain/audits.toml"
+
 [imports.mozilla]
 url = "https://raw.githubusercontent.com/mozilla/supply-chain/main/audits.toml"
 
 [imports.zcash]
 url = "https://raw.githubusercontent.com/zcash/rust-ecosystem/main/supply-chain/audits.toml"
 
-[[exemptions.addr2line]]
-version = "0.25.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.aho-corasick]]
-version = "1.1.4"
-criteria = "safe-to-deploy"
-
-[[exemptions.anyhow]]
-version = "1.0.101"
-criteria = "safe-to-deploy"
-
 [[exemptions.asn1-rs]]
 version = "0.7.1"
 criteria = "safe-to-deploy"
@@ -40,18 +37,6 @@ criteria = "safe-to-deploy"
 version = "0.2.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.async-trait]]
-version = "0.1.89"
-criteria = "safe-to-deploy"
-
-[[exemptions.aws-lc-rs]]
-version = "1.15.4"
-criteria = "safe-to-deploy"
-
-[[exemptions.aws-lc-sys]]
-version = "0.37.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.axum]]
 version = "0.8.8"
 criteria = "safe-to-deploy"
@@ -60,10 +45,6 @@ criteria = "safe-to-deploy"
 version = "0.5.6"
 criteria = "safe-to-deploy"
 
-[[exemptions.backtrace]]
-version = "0.3.76"
-criteria = "safe-to-deploy"
-
 [[exemptions.backtrace-ext]]
 version = "0.2.1"
 criteria = "safe-to-deploy"
@@ -72,26 +53,14 @@ criteria = "safe-to-deploy"
 version = "0.9.1"
 criteria = "safe-to-deploy"
 
-[[exemptions.bitflags]]
-version = "2.10.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.block-buffer]]
 version = "0.11.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.bytes]]
-version = "1.11.1"
-criteria = "safe-to-deploy"
-
 [[exemptions.cc]]
 version = "1.2.55"
 criteria = "safe-to-deploy"
 
-[[exemptions.cfg-if]]
-version = "1.0.4"
-criteria = "safe-to-deploy"
-
 [[exemptions.chacha20]]
 version = "0.10.0"
 criteria = "safe-to-deploy"
@@ -100,26 +69,14 @@ criteria = "safe-to-deploy"
 version = "0.4.43"
 criteria = "safe-to-deploy"
 
-[[exemptions.cmake]]
-version = "0.1.57"
-criteria = "safe-to-deploy"
-
 [[exemptions.cpufeatures]]
 version = "0.2.17"
 criteria = "safe-to-deploy"
 
-[[exemptions.cpufeatures]]
-version = "0.3.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.crc32fast]]
 version = "1.5.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.crossbeam-utils]]
-version = "0.8.21"
-criteria = "safe-to-deploy"
-
 [[exemptions.crypto-common]]
 version = "0.2.0"
 criteria = "safe-to-deploy"
@@ -156,10 +113,6 @@ criteria = "safe-to-deploy"
 version = "10.0.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.deranged]]
-version = "0.5.5"
-criteria = "safe-to-deploy"
-
 [[exemptions.diesel]]
 version = "2.3.6"
 criteria = "safe-to-deploy"
@@ -192,10 +145,6 @@ criteria = "safe-to-deploy"
 version = "0.2.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.dyn-clone]]
-version = "1.0.20"
-criteria = "safe-to-deploy"
-
 [[exemptions.ed25519]]
 version = "3.0.0-rc.4"
 criteria = "safe-to-deploy"
@@ -204,10 +153,6 @@ criteria = "safe-to-deploy"
 version = "3.0.0-pre.6"
 criteria = "safe-to-deploy"
 
-[[exemptions.fiat-crypto]]
-version = "0.3.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.find-msvc-tools]]
 version = "0.1.9"
 criteria = "safe-to-deploy"
@@ -216,22 +161,10 @@ criteria = "safe-to-deploy"
 version = "0.5.7"
 criteria = "safe-to-deploy"
 
-[[exemptions.flate2]]
-version = "1.1.9"
-criteria = "safe-to-deploy"
-
 [[exemptions.fs_extra]]
 version = "1.3.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.futures-task]]
-version = "0.3.31"
-criteria = "safe-to-deploy"
-
-[[exemptions.futures-util]]
-version = "0.3.31"
-criteria = "safe-to-deploy"
-
 [[exemptions.getrandom]]
 version = "0.2.17"
 criteria = "safe-to-deploy"
@@ -244,30 +177,10 @@ criteria = "safe-to-deploy"
 version = "0.4.1"
 criteria = "safe-to-deploy"
 
-[[exemptions.hashbrown]]
-version = "0.14.5"
-criteria = "safe-to-deploy"
-
-[[exemptions.http]]
-version = "1.4.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.http-body-util]]
-version = "0.1.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.httparse]]
-version = "1.10.1"
-criteria = "safe-to-deploy"
-
 [[exemptions.hybrid-array]]
 version = "0.4.7"
 criteria = "safe-to-deploy"
 
-[[exemptions.hyper]]
-version = "1.8.1"
-criteria = "safe-to-deploy"
-
 [[exemptions.hyper-timeout]]
 version = "0.5.2"
 criteria = "safe-to-deploy"
@@ -276,18 +189,6 @@ criteria = "safe-to-deploy"
 version = "0.1.65"
 criteria = "safe-to-deploy"
 
-[[exemptions.id-arena]]
-version = "2.3.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.ident_case]]
-version = "1.0.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.indexmap]]
-version = "2.13.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.is_ci]]
 version = "1.2.0"
 criteria = "safe-to-deploy"
@@ -296,14 +197,6 @@ criteria = "safe-to-deploy"
 version = "0.14.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.itoa]]
-version = "1.0.17"
-criteria = "safe-to-deploy"
-
-[[exemptions.jobserver]]
-version = "0.1.34"
-criteria = "safe-to-deploy"
-
 [[exemptions.js-sys]]
 version = "0.3.85"
 criteria = "safe-to-deploy"
@@ -320,26 +213,10 @@ criteria = "safe-to-deploy"
 version = "0.35.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.linux-raw-sys]]
-version = "0.11.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.lock_api]]
-version = "0.4.14"
-criteria = "safe-to-deploy"
-
-[[exemptions.log]]
-version = "0.4.29"
-criteria = "safe-to-deploy"
-
 [[exemptions.matchit]]
 version = "0.8.4"
 criteria = "safe-to-deploy"
 
-[[exemptions.memchr]]
-version = "2.8.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.memsafe]]
 version = "0.4.0"
 criteria = "safe-to-deploy"
@@ -360,34 +237,14 @@ criteria = "safe-to-deploy"
 version = "2.3.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.mime]]
-version = "0.3.17"
-criteria = "safe-to-deploy"
-
 [[exemptions.minimal-lexical]]
 version = "0.2.1"
 criteria = "safe-to-deploy"
 
-[[exemptions.mio]]
-version = "1.1.1"
-criteria = "safe-to-deploy"
-
 [[exemptions.multimap]]
 version = "0.10.1"
 criteria = "safe-to-deploy"
 
-[[exemptions.num-bigint]]
-version = "0.4.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.num-conv]]
-version = "0.2.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.object]]
-version = "0.37.3"
-criteria = "safe-to-deploy"
-
 [[exemptions.oid-registry]]
 version = "0.8.1"
 criteria = "safe-to-deploy"
@@ -400,14 +257,6 @@ criteria = "safe-to-deploy"
 version = "4.2.3"
 criteria = "safe-to-deploy"
 
-[[exemptions.parking_lot]]
-version = "0.12.5"
-criteria = "safe-to-deploy"
-
-[[exemptions.parking_lot_core]]
-version = "0.9.12"
-criteria = "safe-to-deploy"
-
 [[exemptions.pem]]
 version = "3.0.6"
 criteria = "safe-to-deploy"
@@ -424,58 +273,14 @@ criteria = "safe-to-deploy"
 version = "1.1.10"
 criteria = "safe-to-deploy"
 
-[[exemptions.portable-atomic]]
-version = "1.13.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.prettyplease]]
-version = "0.2.37"
-criteria = "safe-to-deploy"
-
-[[exemptions.proc-macro2]]
-version = "1.0.106"
-criteria = "safe-to-deploy"
-
-[[exemptions.prost]]
-version = "0.14.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.prost-build]]
-version = "0.14.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.prost-derive]]
-version = "0.14.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.prost-types]]
-version = "0.14.3"
-criteria = "safe-to-deploy"
-
 [[exemptions.pulldown-cmark]]
 version = "0.13.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.pulldown-cmark-to-cmark]]
-version = "22.0.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.quote]]
-version = "1.0.44"
-criteria = "safe-to-deploy"
-
 [[exemptions.r-efi]]
 version = "5.3.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.rand]]
-version = "0.10.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.rand_core]]
-version = "0.10.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.rcgen]]
 version = "0.14.7"
 criteria = "safe-to-deploy"
@@ -484,18 +289,6 @@ criteria = "safe-to-deploy"
 version = "0.5.18"
 criteria = "safe-to-deploy"
 
-[[exemptions.regex]]
-version = "1.12.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.regex-automata]]
-version = "0.4.14"
-criteria = "safe-to-deploy"
-
-[[exemptions.regex-syntax]]
-version = "0.8.9"
-criteria = "safe-to-deploy"
-
 [[exemptions.ring]]
 version = "0.17.14"
 criteria = "safe-to-deploy"
@@ -504,10 +297,6 @@ criteria = "safe-to-deploy"
 version = "0.1.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.rustc-demangle]]
-version = "0.1.27"
-criteria = "safe-to-deploy"
-
 [[exemptions.rusticata-macros]]
 version = "4.1.0"
 criteria = "safe-to-deploy"
@@ -528,10 +317,6 @@ criteria = "safe-to-deploy"
 version = "0.1.4"
 criteria = "safe-to-deploy"
 
-[[exemptions.scopeguard]]
-version = "1.2.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.secrecy]]
 version = "0.10.3"
 criteria = "safe-to-deploy"
@@ -540,18 +325,6 @@ criteria = "safe-to-deploy"
 version = "1.0.27"
 criteria = "safe-to-deploy"
 
-[[exemptions.serde]]
-version = "1.0.228"
-criteria = "safe-to-deploy"
-
-[[exemptions.serde_core]]
-version = "1.0.228"
-criteria = "safe-to-deploy"
-
-[[exemptions.serde_derive]]
-version = "1.0.228"
-criteria = "safe-to-deploy"
-
 [[exemptions.sha2]]
 version = "0.11.0-rc.5"
 criteria = "safe-to-deploy"
@@ -568,10 +341,6 @@ criteria = "safe-to-deploy"
 version = "0.3.8"
 criteria = "safe-to-deploy"
 
-[[exemptions.slab]]
-version = "0.4.12"
-criteria = "safe-to-deploy"
-
 [[exemptions.smlang]]
 version = "0.8.0"
 criteria = "safe-to-deploy"
@@ -580,10 +349,6 @@ criteria = "safe-to-deploy"
 version = "0.8.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.socket2]]
-version = "0.6.2"
-criteria = "safe-to-deploy"
-
 [[exemptions.sqlite-wasm-rs]]
 version = "0.5.2"
 criteria = "safe-to-deploy"
@@ -592,10 +357,6 @@ criteria = "safe-to-deploy"
 version = "0.1.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.subtle]]
-version = "2.6.1"
-criteria = "safe-to-deploy"
-
 [[exemptions.supports-color]]
 version = "3.0.2"
 criteria = "safe-to-deploy"
@@ -620,74 +381,10 @@ criteria = "safe-to-deploy"
 version = "0.4.3"
 criteria = "safe-to-deploy"
 
-[[exemptions.thiserror]]
-version = "2.0.18"
-criteria = "safe-to-deploy"
-
-[[exemptions.thiserror-impl]]
-version = "2.0.18"
-criteria = "safe-to-deploy"
-
-[[exemptions.time]]
-version = "0.3.47"
-criteria = "safe-to-deploy"
-
-[[exemptions.time-core]]
-version = "0.1.8"
-criteria = "safe-to-deploy"
-
-[[exemptions.time-macros]]
-version = "0.2.27"
-criteria = "safe-to-deploy"
-
-[[exemptions.tokio]]
-version = "1.49.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.tokio-macros]]
-version = "2.6.0"
-criteria = "safe-to-deploy"
-
 [[exemptions.tokio-rustls]]
 version = "0.26.4"
 criteria = "safe-to-deploy"
 
-[[exemptions.tokio-stream]]
-version = "0.1.18"
-criteria = "safe-to-deploy"
-
-[[exemptions.tokio-util]]
-version = "0.7.18"
-criteria = "safe-to-deploy"
-
-[[exemptions.tonic]]
-version = "0.14.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.tonic-build]]
-version = "0.14.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.tonic-prost]]
-version = "0.14.4"
-criteria = "safe-to-deploy"
-
-[[exemptions.tonic-prost-build]]
-version = "0.14.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.tower]]
-version = "0.5.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.tower-layer]]
-version = "0.3.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.tower-service]]
-version = "0.3.3"
-criteria = "safe-to-deploy"
-
 [[exemptions.tracing]]
 version = "0.1.44"
 criteria = "safe-to-deploy"
@@ -708,34 +405,10 @@ criteria = "safe-to-run"
 version = "1.19.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.unicase]]
-version = "2.9.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.unicode-ident]]
-version = "1.0.23"
-criteria = "safe-to-deploy"
-
-[[exemptions.untrusted]]
-version = "0.7.1"
-criteria = "safe-to-deploy"
-
 [[exemptions.untrusted]]
 version = "0.9.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.uuid]]
-version = "1.20.0"
-criteria = "safe-to-deploy"
-
-[[exemptions.wasi]]
-version = "0.11.1+wasi-snapshot-preview1"
-criteria = "safe-to-deploy"
-
-[[exemptions.wasm-bindgen]]
-version = "0.2.108"
-criteria = "safe-to-deploy"
-
 [[exemptions.wasm-bindgen-macro]]
 version = "0.2.108"
 criteria = "safe-to-deploy"
@@ -760,102 +433,6 @@ criteria = "safe-to-deploy"
 version = "0.4.0"
 criteria = "safe-to-deploy"
 
-[[exemptions.windows-core]]
-version = "0.62.2"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows-implement]]
-version = "0.60.2"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows-interface]]
-version = "0.59.3"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows-result]]
-version = "0.4.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows-strings]]
-version = "0.5.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows-targets]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows-targets]]
-version = "0.53.5"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_aarch64_gnullvm]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_aarch64_gnullvm]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_aarch64_msvc]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_aarch64_msvc]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_i686_gnu]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_i686_gnu]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_i686_gnullvm]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_i686_gnullvm]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_i686_msvc]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_i686_msvc]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_x86_64_gnu]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_x86_64_gnu]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_x86_64_gnullvm]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_x86_64_gnullvm]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_x86_64_msvc]]
-version = "0.52.6"
-criteria = "safe-to-deploy"
-
-[[exemptions.windows_x86_64_msvc]]
-version = "0.53.1"
-criteria = "safe-to-deploy"
-
-[[exemptions.winnow]]
-version = "0.7.14"
-criteria = "safe-to-deploy"
-
 [[exemptions.x509-parser]]
 version = "0.18.1"
 criteria = "safe-to-deploy"
@@ -864,10 +441,6 @@ criteria = "safe-to-deploy"
 version = "0.5.2"
 criteria = "safe-to-deploy"
 
-[[exemptions.zmij]]
-version = "1.0.20"
-criteria = "safe-to-deploy"
-
 [[exemptions.zstd]]
 version = "0.13.3"
 criteria = "safe-to-deploy"

useragent/.dart_tool/extension_discovery/README.md

@@ -1,31 +0,0 @@
-Extension Discovery Cache
-=========================
-
-This folder is used by `package:extension_discovery` to cache lists of
-packages that contains extensions for other packages.
-
-DO NOT USE THIS FOLDER
-----------------------
-
- * Do not read (or rely) the contents of this folder.
- * Do write to this folder.
-
-If you're interested in the lists of extensions stored in this folder use the
-API offered by package `extension_discovery` to get this information.
-
-If this package doesn't work for your use-case, then don't try to read the
-contents of this folder. It may change, and will not remain stable.
-
-Use package `extension_discovery`
----------------------------------
-
-If you want to access information from this folder.
-
-Feel free to delete this folder
--------------------------------
-
-Files in this folder act as a cache, and the cache is discarded if the files
-are older than the modification time of `.dart_tool/package_config.json`.
-
-Hence, it should never be necessary to clear this cache manually, if you find a
-need to do please file a bug.

useragent/.dart_tool/extension_discovery/vs_code.json

@@ -1 +0,0 @@
-{"version":2,"entries":[{"package":"arbiter","rootUri":"../","packageUri":"lib/"}]}

useragent/.dart_tool/package_config.json

@@ -1,172 +0,0 @@
-{
-  "configVersion": 2,
-  "packages": [
-    {
-      "name": "async",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/async-2.13.0",
-      "packageUri": "lib/",
-      "languageVersion": "3.4"
-    },
-    {
-      "name": "boolean_selector",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/boolean_selector-2.1.2",
-      "packageUri": "lib/",
-      "languageVersion": "3.1"
-    },
-    {
-      "name": "characters",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/characters-1.4.0",
-      "packageUri": "lib/",
-      "languageVersion": "3.4"
-    },
-    {
-      "name": "clock",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/clock-1.1.2",
-      "packageUri": "lib/",
-      "languageVersion": "3.4"
-    },
-    {
-      "name": "collection",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/collection-1.19.1",
-      "packageUri": "lib/",
-      "languageVersion": "3.4"
-    },
-    {
-      "name": "fake_async",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/fake_async-1.3.3",
-      "packageUri": "lib/",
-      "languageVersion": "3.3"
-    },
-    {
-      "name": "flutter",
-      "rootUri": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable/packages/flutter",
-      "packageUri": "lib/",
-      "languageVersion": "3.8"
-    },
-    {
-      "name": "flutter_lints",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/flutter_lints-6.0.0",
-      "packageUri": "lib/",
-      "languageVersion": "3.8"
-    },
-    {
-      "name": "flutter_test",
-      "rootUri": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable/packages/flutter_test",
-      "packageUri": "lib/",
-      "languageVersion": "3.8"
-    },
-    {
-      "name": "leak_tracker",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/leak_tracker-11.0.2",
-      "packageUri": "lib/",
-      "languageVersion": "3.2"
-    },
-    {
-      "name": "leak_tracker_flutter_testing",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/leak_tracker_flutter_testing-3.0.10",
-      "packageUri": "lib/",
-      "languageVersion": "3.2"
-    },
-    {
-      "name": "leak_tracker_testing",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/leak_tracker_testing-3.0.2",
-      "packageUri": "lib/",
-      "languageVersion": "3.2"
-    },
-    {
-      "name": "lints",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/lints-6.1.0",
-      "packageUri": "lib/",
-      "languageVersion": "3.8"
-    },
-    {
-      "name": "matcher",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/matcher-0.12.17",
-      "packageUri": "lib/",
-      "languageVersion": "3.4"
-    },
-    {
-      "name": "material_color_utilities",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/material_color_utilities-0.11.1",
-      "packageUri": "lib/",
-      "languageVersion": "2.17"
-    },
-    {
-      "name": "meta",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/meta-1.17.0",
-      "packageUri": "lib/",
-      "languageVersion": "3.5"
-    },
-    {
-      "name": "path",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/path-1.9.1",
-      "packageUri": "lib/",
-      "languageVersion": "3.4"
-    },
-    {
-      "name": "sky_engine",
-      "rootUri": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable/bin/cache/pkg/sky_engine",
-      "packageUri": "lib/",
-      "languageVersion": "3.8"
-    },
-    {
-      "name": "source_span",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/source_span-1.10.2",
-      "packageUri": "lib/",
-      "languageVersion": "3.1"
-    },
-    {
-      "name": "stack_trace",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/stack_trace-1.12.1",
-      "packageUri": "lib/",
-      "languageVersion": "3.4"
-    },
-    {
-      "name": "stream_channel",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/stream_channel-2.1.4",
-      "packageUri": "lib/",
-      "languageVersion": "3.3"
-    },
-    {
-      "name": "string_scanner",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/string_scanner-1.4.1",
-      "packageUri": "lib/",
-      "languageVersion": "3.1"
-    },
-    {
-      "name": "term_glyph",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/term_glyph-1.2.2",
-      "packageUri": "lib/",
-      "languageVersion": "3.1"
-    },
-    {
-      "name": "test_api",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/test_api-0.7.7",
-      "packageUri": "lib/",
-      "languageVersion": "3.5"
-    },
-    {
-      "name": "vector_math",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/vector_math-2.2.0",
-      "packageUri": "lib/",
-      "languageVersion": "3.1"
-    },
-    {
-      "name": "vm_service",
-      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/vm_service-15.0.2",
-      "packageUri": "lib/",
-      "languageVersion": "3.5"
-    },
-    {
-      "name": "arbiter",
-      "rootUri": "../",
-      "packageUri": "lib/",
-      "languageVersion": "3.10"
-    }
-  ],
-  "generator": "pub",
-  "generatorVersion": "3.10.8",
-  "flutterRoot": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable",
-  "flutterVersion": "3.38.9",
-  "pubCache": "file:///Users/kaska/.pub-cache"
-}

useragent/.dart_tool/package_graph.json

@@ -1,224 +0,0 @@
-{
-  "roots": [
-    "arbiter"
-  ],
-  "packages": [
-    {
-      "name": "arbiter",
-      "version": "0.1.0",
-      "dependencies": [
-        "flutter"
-      ],
-      "devDependencies": [
-        "flutter_lints",
-        "flutter_test"
-      ]
-    },
-    {
-      "name": "flutter_lints",
-      "version": "6.0.0",
-      "dependencies": [
-        "lints"
-      ]
-    },
-    {
-      "name": "flutter_test",
-      "version": "0.0.0",
-      "dependencies": [
-        "clock",
-        "collection",
-        "fake_async",
-        "flutter",
-        "leak_tracker_flutter_testing",
-        "matcher",
-        "meta",
-        "path",
-        "stack_trace",
-        "stream_channel",
-        "test_api",
-        "vector_math"
-      ]
-    },
-    {
-      "name": "flutter",
-      "version": "0.0.0",
-      "dependencies": [
-        "characters",
-        "collection",
-        "material_color_utilities",
-        "meta",
-        "sky_engine",
-        "vector_math"
-      ]
-    },
-    {
-      "name": "lints",
-      "version": "6.1.0",
-      "dependencies": []
-    },
-    {
-      "name": "stream_channel",
-      "version": "2.1.4",
-      "dependencies": [
-        "async"
-      ]
-    },
-    {
-      "name": "meta",
-      "version": "1.17.0",
-      "dependencies": []
-    },
-    {
-      "name": "collection",
-      "version": "1.19.1",
-      "dependencies": []
-    },
-    {
-      "name": "leak_tracker_flutter_testing",
-      "version": "3.0.10",
-      "dependencies": [
-        "flutter",
-        "leak_tracker",
-        "leak_tracker_testing",
-        "matcher",
-        "meta"
-      ]
-    },
-    {
-      "name": "vector_math",
-      "version": "2.2.0",
-      "dependencies": []
-    },
-    {
-      "name": "stack_trace",
-      "version": "1.12.1",
-      "dependencies": [
-        "path"
-      ]
-    },
-    {
-      "name": "clock",
-      "version": "1.1.2",
-      "dependencies": []
-    },
-    {
-      "name": "fake_async",
-      "version": "1.3.3",
-      "dependencies": [
-        "clock",
-        "collection"
-      ]
-    },
-    {
-      "name": "path",
-      "version": "1.9.1",
-      "dependencies": []
-    },
-    {
-      "name": "matcher",
-      "version": "0.12.17",
-      "dependencies": [
-        "async",
-        "meta",
-        "stack_trace",
-        "term_glyph",
-        "test_api"
-      ]
-    },
-    {
-      "name": "test_api",
-      "version": "0.7.7",
-      "dependencies": [
-        "async",
-        "boolean_selector",
-        "collection",
-        "meta",
-        "source_span",
-        "stack_trace",
-        "stream_channel",
-        "string_scanner",
-        "term_glyph"
-      ]
-    },
-    {
-      "name": "sky_engine",
-      "version": "0.0.0",
-      "dependencies": []
-    },
-    {
-      "name": "material_color_utilities",
-      "version": "0.11.1",
-      "dependencies": [
-        "collection"
-      ]
-    },
-    {
-      "name": "characters",
-      "version": "1.4.0",
-      "dependencies": []
-    },
-    {
-      "name": "async",
-      "version": "2.13.0",
-      "dependencies": [
-        "collection",
-        "meta"
-      ]
-    },
-    {
-      "name": "leak_tracker_testing",
-      "version": "3.0.2",
-      "dependencies": [
-        "leak_tracker",
-        "matcher",
-        "meta"
-      ]
-    },
-    {
-      "name": "leak_tracker",
-      "version": "11.0.2",
-      "dependencies": [
-        "clock",
-        "collection",
-        "meta",
-        "path",
-        "vm_service"
-      ]
-    },
-    {
-      "name": "term_glyph",
-      "version": "1.2.2",
-      "dependencies": []
-    },
-    {
-      "name": "string_scanner",
-      "version": "1.4.1",
-      "dependencies": [
-        "source_span"
-      ]
-    },
-    {
-      "name": "source_span",
-      "version": "1.10.2",
-      "dependencies": [
-        "collection",
-        "path",
-        "term_glyph"
-      ]
-    },
-    {
-      "name": "boolean_selector",
-      "version": "2.1.2",
-      "dependencies": [
-        "source_span",
-        "string_scanner"
-      ]
-    },
-    {
-      "name": "vm_service",
-      "version": "15.0.2",
-      "dependencies": []
-    }
-  ],
-  "configVersion": 1
-}

useragent/.dart_tool/version

@@ -1 +0,0 @@
-3.38.9

useragent/README.md

@@ -1,4 +1,4 @@
-# app
+# useragent
 
 A new Flutter project.
 

useragent/android/.gitignore

@@ -0,0 +1,14 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+.cxx/
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/to/reference-keystore
+key.properties
+**/*.keystore
+**/*.jks

useragent/android/app/build.gradle.kts

@@ -0,0 +1,44 @@
+plugins {
+    id("com.android.application")
+    id("kotlin-android")
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+    id("dev.flutter.flutter-gradle-plugin")
+}
+
+android {
+    namespace = "com.example.useragent"
+    compileSdk = flutter.compileSdkVersion
+    ndkVersion = flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_17.toString()
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId = "com.example.useragent"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
+        minSdk = flutter.minSdkVersion
+        targetSdk = flutter.targetSdkVersion
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig = signingConfigs.getByName("debug")
+        }
+    }
+}
+
+flutter {
+    source = "../.."
+}

useragent/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

useragent/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,45 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="useragent"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:taskAffinity=""
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+    <!-- Required to query activities that can process text, see:
+         https://developer.android.com/training/package-visibility and
+         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
+
+         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.PROCESS_TEXT"/>
+            <data android:mimeType="text/plain"/>
+        </intent>
+    </queries>
+</manifest>

useragent/android/app/src/main/kotlin/com/example/useragent/MainActivity.kt

@@ -0,0 +1,5 @@
+package com.example.useragent
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity : FlutterActivity()

useragent/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

useragent/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

useragent/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

useragent/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

useragent/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

useragent/android/build.gradle.kts

@@ -0,0 +1,24 @@
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+val newBuildDir: Directory =
+    rootProject.layout.buildDirectory
+        .dir("../../build")
+        .get()
+rootProject.layout.buildDirectory.value(newBuildDir)
+
+subprojects {
+    val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name)
+    project.layout.buildDirectory.value(newSubprojectBuildDir)
+}
+subprojects {
+    project.evaluationDependsOn(":app")
+}
+
+tasks.register<Delete>("clean") {
+    delete(rootProject.layout.buildDirectory)
+}

useragent/android/gradle.properties

@@ -0,0 +1,2 @@
+org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
+android.useAndroidX=true

useragent/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-all.zip

useragent/android/settings.gradle.kts

@@ -0,0 +1,26 @@
+pluginManagement {
+    val flutterSdkPath =
+        run {
+            val properties = java.util.Properties()
+            file("local.properties").inputStream().use { properties.load(it) }
+            val flutterSdkPath = properties.getProperty("flutter.sdk")
+            require(flutterSdkPath != null) { "flutter.sdk not set in local.properties" }
+            flutterSdkPath
+        }
+
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+plugins {
+    id("dev.flutter.flutter-plugin-loader") version "1.0.0"
+    id("com.android.application") version "8.11.1" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.20" apply false
+}
+
+include(":app")

useragent/lib/features/connection/arbiter_url.dart

@@ -0,0 +1,56 @@
+import 'dart:convert';
+
+class ArbiterUrl {
+  const ArbiterUrl({
+    required this.host,
+    required this.port,
+    required this.caCert,
+    this.bootstrapToken,
+  });
+
+  final String host;
+  final int port;
+  final List<int> caCert;
+  final String? bootstrapToken;
+
+  static const _scheme = 'arbiter';
+  static const _certQueryKey = 'cert';
+  static const _bootstrapTokenQueryKey = 'bootstrap_token';
+
+  static ArbiterUrl parse(String value) {
+    final uri = Uri.tryParse(value);
+    if (uri == null || uri.scheme != _scheme) {
+      throw const FormatException("Invalid URL scheme, expected 'arbiter://'");
+    }
+
+    if (uri.host.isEmpty) {
+      throw const FormatException('Missing host in URL');
+    }
+
+    if (!uri.hasPort) {
+      throw const FormatException('Missing port in URL');
+    }
+
+    final cert = uri.queryParameters[_certQueryKey];
+    if (cert == null || cert.isEmpty) {
+      throw const FormatException("Missing 'cert' query parameter in URL");
+    }
+
+    final decodedCert = _decodeCert(cert);
+
+    return ArbiterUrl(
+      host: uri.host,
+      port: uri.port,
+      caCert: decodedCert,
+      bootstrapToken: uri.queryParameters[_bootstrapTokenQueryKey],
+    );
+  }
+
+  static List<int> _decodeCert(String cert) {
+    try {
+      return base64Url.decode(base64Url.normalize(cert));
+    } on FormatException catch (error) {
+      throw FormatException("Invalid base64 in 'cert' query parameter: ${error.message}");
+    }
+  }
+}

useragent/lib/features/connection/auth.dart

@@ -0,0 +1,103 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:arbiter/features/connection/connection.dart';
+import 'package:arbiter/features/connection/server_info_storage.dart';
+import 'package:arbiter/features/identity/pk_manager.dart';
+import 'package:arbiter/proto/arbiter.pbgrpc.dart';
+import 'package:arbiter/proto/user_agent.pb.dart';
+import 'package:grpc/grpc.dart';
+import 'package:mtcore/markettakers.dart';
+
+Future<Connection> connectAndAuthorize(
+  StoredServerInfo serverInfo,
+  KeyHandle key, {
+  String? bootstrapToken,
+}) async {
+  try {
+    final connection = await _connect(serverInfo);
+    talker.info(
+      'Connected to server at ${serverInfo.address}:${serverInfo.port}',
+    );
+    final pubkey = await key.getPublicKey();
+
+    final req = AuthChallengeRequest(
+      pubkey: pubkey,
+      bootstrapToken: bootstrapToken,
+      keyType: switch (key.alg) {
+        KeyAlgorithm.rsa => KeyType.KEY_TYPE_RSA,
+        KeyAlgorithm.ecdsa => KeyType.KEY_TYPE_ECDSA_SECP256K1,
+        KeyAlgorithm.ed25519 => KeyType.KEY_TYPE_ED25519,
+      },
+    );
+    await connection.send(UserAgentRequest(authChallengeRequest: req));
+    talker.info(
+      "Sent auth challenge request with pubkey ${base64Encode(pubkey)}",
+    );
+
+    final response = await connection.receive();
+    talker.info('Received response from server, checking auth flow...');
+
+    if (response.hasAuthOk()) {
+      talker.info('Authentication successful, connection established');
+      return connection;
+    }
+
+    if (!response.hasAuthChallenge()) {
+      throw Exception(
+        'Expected AuthChallengeResponse, got ${response.whichPayload()}',
+      );
+    }
+
+    final challenge = _formatChallenge(response.authChallenge, pubkey);
+    talker.info(
+      'Received auth challenge, signing with key ${base64Encode(pubkey)}',
+    );
+
+    final signature = await key.sign(challenge);
+    await connection.send(
+      UserAgentRequest(authChallengeSolution: AuthChallengeSolution(signature: signature)),
+    );
+
+    talker.info('Sent auth challenge solution, waiting for server response...');
+
+    final solutionResponse = await connection.receive();
+    if (!solutionResponse.hasAuthOk()) {
+      throw Exception(
+        'Expected AuthChallengeSolutionResponse, got ${solutionResponse.whichPayload()}',
+      );
+    }
+
+    talker.info('Authentication successful, connection established');
+    return connection;
+  } catch (e) {
+    throw Exception('Failed to connect to server: $e');
+  }
+}
+
+Future<Connection> _connect(StoredServerInfo serverInfo) async {
+  final channel = ClientChannel(
+    serverInfo.address,
+    port: serverInfo.port,
+    options: ChannelOptions(
+      connectTimeout: const Duration(seconds: 10),
+      credentials: ChannelCredentials.secure(
+        onBadCertificate: (cert, host) {
+          return true;
+        },
+      ),
+    ),
+  );
+
+  final client = ArbiterServiceClient(channel);
+  final tx = StreamController<UserAgentRequest>();
+  final rx = client.userAgent(tx.stream);
+
+  return Connection(channel: channel, tx: tx, rx: rx);
+}
+
+List<int> _formatChallenge(AuthChallenge challenge, List<int> pubkey) {
+  final encodedPubkey = base64Encode(pubkey);
+  final payload = "${challenge.nonce}:$encodedPubkey";
+  return utf8.encode(payload);
+}

useragent/lib/features/connection/connection.dart

@@ -0,0 +1,37 @@
+import 'dart:async';
+
+import 'package:arbiter/proto/user_agent.pb.dart';
+import 'package:grpc/grpc.dart';
+import 'package:mtcore/markettakers.dart';
+
+class Connection {
+  final ClientChannel channel;
+  final StreamController<UserAgentRequest> _tx;
+  final StreamIterator<UserAgentResponse> _rx;
+
+  Connection({
+    required this.channel,
+    required StreamController<UserAgentRequest> tx,
+    required ResponseStream<UserAgentResponse> rx,
+  }) : _tx = tx,
+       _rx = StreamIterator(rx);
+
+  Future<void> send(UserAgentRequest request) async {
+    talker.debug('Sending request: ${request.toDebugString()}');
+    _tx.add(request);
+  }
+
+  Future<UserAgentResponse> receive() async {
+    final hasValue = await _rx.moveNext();
+    if (!hasValue) {
+      throw Exception('Connection closed while waiting for server response.');
+    }
+    talker.debug('Received response: ${_rx.current.toDebugString()}');
+    return _rx.current;
+  }
+
+  Future<void> close() async {
+    await _tx.close();
+    await channel.shutdown();
+  }
+}

useragent/lib/features/connection/evm.dart

@@ -0,0 +1,56 @@
+import 'package:arbiter/features/connection/connection.dart';
+import 'package:arbiter/proto/evm.pb.dart';
+import 'package:arbiter/proto/user_agent.pb.dart';
+import 'package:protobuf/well_known_types/google/protobuf/empty.pb.dart';
+
+Future<List<WalletEntry>> listEvmWallets(Connection connection) async {
+  await connection.send(UserAgentRequest(evmWalletList: Empty()));
+
+  final response = await connection.receive();
+  if (!response.hasEvmWalletList()) {
+    throw Exception(
+      'Expected EVM wallet list response, got ${response.whichPayload()}',
+    );
+  }
+
+  final result = response.evmWalletList;
+  switch (result.whichResult()) {
+    case WalletListResponse_Result.wallets:
+      return result.wallets.wallets.toList(growable: false);
+    case WalletListResponse_Result.error:
+      throw Exception(_describeEvmError(result.error));
+    case WalletListResponse_Result.notSet:
+      throw Exception('EVM wallet list response was empty.');
+  }
+}
+
+Future<void> createEvmWallet(Connection connection) async {
+  await connection.send(UserAgentRequest(evmWalletCreate: Empty()));
+
+  final response = await connection.receive();
+  if (!response.hasEvmWalletCreate()) {
+    throw Exception(
+      'Expected EVM wallet create response, got ${response.whichPayload()}',
+    );
+  }
+
+  final result = response.evmWalletCreate;
+  switch (result.whichResult()) {
+    case WalletCreateResponse_Result.wallet:
+      return;
+    case WalletCreateResponse_Result.error:
+      throw Exception(_describeEvmError(result.error));
+    case WalletCreateResponse_Result.notSet:
+      throw Exception('Wallet creation returned no result.');
+  }
+}
+
+String _describeEvmError(EvmError error) {
+  return switch (error) {
+    EvmError.EVM_ERROR_VAULT_SEALED =>
+      'The vault is sealed. Unseal it before using EVM wallets.',
+    EvmError.EVM_ERROR_INTERNAL || EvmError.EVM_ERROR_UNSPECIFIED =>
+      'The server failed to process the EVM request.',
+    _ => 'The server failed to process the EVM request.',
+  };
+}

useragent/lib/features/connection/evm/grants.dart

@@ -0,0 +1,122 @@
+import 'package:arbiter/features/connection/connection.dart';
+import 'package:arbiter/proto/evm.pb.dart';
+import 'package:arbiter/proto/user_agent.pb.dart';
+import 'package:fixnum/fixnum.dart';
+import 'package:protobuf/well_known_types/google/protobuf/timestamp.pb.dart';
+
+Future<List<GrantEntry>> listEvmGrants(
+  Connection connection, {
+  int? walletId,
+}) async {
+  final request = EvmGrantListRequest();
+  if (walletId != null) {
+    request.walletId = walletId;
+  }
+
+  await connection.send(UserAgentRequest(evmGrantList: request));
+
+  final response = await connection.receive();
+  if (!response.hasEvmGrantList()) {
+    throw Exception(
+      'Expected EVM grant list response, got ${response.whichPayload()}',
+    );
+  }
+
+  final result = response.evmGrantList;
+  switch (result.whichResult()) {
+    case EvmGrantListResponse_Result.grants:
+      return result.grants.grants.toList(growable: false);
+    case EvmGrantListResponse_Result.error:
+      throw Exception(_describeGrantError(result.error));
+    case EvmGrantListResponse_Result.notSet:
+      throw Exception('EVM grant list response was empty.');
+  }
+}
+
+Future<int> createEvmGrant(
+  Connection connection, {
+  required int clientId,
+  required int walletId,
+  required Int64 chainId,
+  DateTime? validFrom,
+  DateTime? validUntil,
+  List<int>? maxGasFeePerGas,
+  List<int>? maxPriorityFeePerGas,
+  TransactionRateLimit? rateLimit,
+  required SpecificGrant specific,
+}) async {
+  await connection.send(
+    UserAgentRequest(
+      evmGrantCreate: EvmGrantCreateRequest(
+        clientId: clientId,
+        shared: SharedSettings(
+          walletId: walletId,
+          chainId: chainId,
+          validFrom: validFrom == null ? null : _toTimestamp(validFrom),
+          validUntil: validUntil == null ? null : _toTimestamp(validUntil),
+          maxGasFeePerGas: maxGasFeePerGas,
+          maxPriorityFeePerGas: maxPriorityFeePerGas,
+          rateLimit: rateLimit,
+        ),
+        specific: specific,
+      ),
+    ),
+  );
+
+  final response = await connection.receive();
+  if (!response.hasEvmGrantCreate()) {
+    throw Exception(
+      'Expected EVM grant create response, got ${response.whichPayload()}',
+    );
+  }
+
+  final result = response.evmGrantCreate;
+  switch (result.whichResult()) {
+    case EvmGrantCreateResponse_Result.grantId:
+      return result.grantId;
+    case EvmGrantCreateResponse_Result.error:
+      throw Exception(_describeGrantError(result.error));
+    case EvmGrantCreateResponse_Result.notSet:
+      throw Exception('Grant creation returned no result.');
+  }
+}
+
+Future<void> deleteEvmGrant(Connection connection, int grantId) async {
+  await connection.send(
+    UserAgentRequest(evmGrantDelete: EvmGrantDeleteRequest(grantId: grantId)),
+  );
+
+  final response = await connection.receive();
+  if (!response.hasEvmGrantDelete()) {
+    throw Exception(
+      'Expected EVM grant delete response, got ${response.whichPayload()}',
+    );
+  }
+
+  final result = response.evmGrantDelete;
+  switch (result.whichResult()) {
+    case EvmGrantDeleteResponse_Result.ok:
+      return;
+    case EvmGrantDeleteResponse_Result.error:
+      throw Exception(_describeGrantError(result.error));
+    case EvmGrantDeleteResponse_Result.notSet:
+      throw Exception('Grant revoke returned no result.');
+  }
+}
+
+Timestamp _toTimestamp(DateTime value) {
+  final utc = value.toUtc();
+  return Timestamp()
+    ..seconds = Int64(utc.millisecondsSinceEpoch ~/ 1000)
+    ..nanos = (utc.microsecondsSinceEpoch % 1000000) * 1000;
+}
+
+String _describeGrantError(EvmError error) {
+  return switch (error) {
+    EvmError.EVM_ERROR_VAULT_SEALED =>
+      'The vault is sealed. Unseal it before using EVM grants.',
+    EvmError.EVM_ERROR_INTERNAL || EvmError.EVM_ERROR_UNSPECIFIED =>
+      'The server failed to process the EVM grant request.',
+    _ => 'The server failed to process the EVM grant request.',
+  };
+}

useragent/lib/features/connection/server_info_storage.dart

@@ -0,0 +1,62 @@
+import 'dart:convert';
+
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'server_info_storage.g.dart';
+
+@JsonSerializable()
+class StoredServerInfo {
+  const StoredServerInfo({
+    required this.address,
+    required this.port,
+    required this.caCertFingerprint,
+  });
+
+  final String address;
+  final int port;
+  final String caCertFingerprint;
+
+  factory StoredServerInfo.fromJson(Map<String, dynamic> json) => _$StoredServerInfoFromJson(json);
+  Map<String, dynamic> toJson() => _$StoredServerInfoToJson(this);
+  
+}
+
+abstract class ServerInfoStorage {
+  Future<StoredServerInfo?> load();
+  Future<void> save(StoredServerInfo serverInfo);
+  Future<void> clear();
+}
+
+class SecureServerInfoStorage implements ServerInfoStorage {
+  static const _storageKey = 'server_info';
+
+  const SecureServerInfoStorage();
+
+  static const _storage = FlutterSecureStorage();
+
+  @override
+  Future<StoredServerInfo?> load() async {
+    return null;
+    final rawValue = await _storage.read(key: _storageKey);
+    if (rawValue == null) {
+      return null;
+    }
+
+    final decoded = jsonDecode(rawValue) as Map<String, dynamic>;
+    return StoredServerInfo.fromJson(decoded);
+  }
+
+  @override
+  Future<void> save(StoredServerInfo serverInfo) {
+    return _storage.write(
+      key: _storageKey,
+      value: jsonEncode(serverInfo.toJson()),
+    );
+  }
+
+  @override
+  Future<void> clear() {
+    return _storage.delete(key: _storageKey);
+  }
+}