5 Commits

Author SHA1 Message Date
hdbg
3cc63474a8 chore(server): update Cargo.lock dependencies
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2026-02-26 22:41:50 +01:00
hdbg
3478204b9f tests(user-agent): basic auth tests similar to server 2026-02-26 22:41:24 +01:00
hdbg
61c65ddbcb feat(useragent): initial connection impl 2026-02-26 22:22:44 +01:00
hdbg
3401205cbd refactor(transport): simplify converters 2026-02-26 21:42:24 +01:00
hdbg
1799aef6f8 refactor(transport): implemented Bi stream based abstraction for actor communication with next loop override 2026-02-26 19:22:33 +01:00
12 changed files with 859 additions and 268 deletions

194
server/Cargo.lock generated
View File

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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1f01b580c9ac74c8d8f0c0e4afb04eeef2acf145458e52c03845ee9cd23e3d12"
checksum = "de0e091bdb824da87dc01d967388880d017a0a9bc4f3bdc0d86ee9f9336e3bb5"
dependencies = [
"unicode-ident",
]
@@ -3171,7 +3175,7 @@ checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.115",
"syn 2.0.117",
]
[[package]]
@@ -3182,7 +3186,7 @@ checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.115",
"syn 2.0.117",
]
[[package]]
@@ -3413,7 +3417,7 @@ dependencies = [
"heck",
"indexmap",
"prettyplease",
"syn 2.0.115",
"syn 2.0.117",
"wasm-metadata",
"wit-bindgen-core",
"wit-component",
@@ -3429,7 +3433,7 @@ dependencies = [
"prettyplease",
"proc-macro2",
"quote",
"syn 2.0.115",
"syn 2.0.117",
"wit-bindgen-core",
"wit-bindgen-rust",
]
@@ -3535,7 +3539,7 @@ checksum = "b659052874eb698efe5b9e8cf382204678a0086ebf46982b79d6ca3182927e5d"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.115",
"syn 2.0.117",
"synstructure",
]
@@ -3556,7 +3560,7 @@ checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.115",
"syn 2.0.117",
"synstructure",
]
@@ -3577,7 +3581,7 @@ checksum = "85a5b4158499876c763cb03bc4e49185d3cccbabb15b33c627f7884f43db852e"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.115",
"syn 2.0.117",
]
[[package]]
@@ -3610,7 +3614,7 @@ checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.115",
"syn 2.0.117",
]
[[package]]

View File

@@ -1,8 +1,80 @@
use std::marker::PhantomData;
//! Transport-facing abstractions for 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
//!
//! [`Bi`] is intentionally minimal and transport-agnostic:
//! - [`Bi::recv`] yields inbound protocol messages
//! - [`Bi::send`] accepts outbound protocol/domain items
//!
//! # 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`.
//!
//! 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.
//!
//! [`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
//! ```
//!
//! # 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`].
use futures::StreamExt;
use tokio::sync::mpsc;
use tonic::{Status, Streaming};
use std::marker::PhantomData;
/// Errors returned by transport adapters implementing [`Bi`].
pub enum Error {
@@ -12,87 +84,40 @@ pub enum Error {
/// Minimal bidirectional transport abstraction used by protocol code.
///
/// `Bi<T, U, E>` models a duplex channel with:
/// - inbound items of type `T` read via [`Bi::recv`]
/// - outbound success items of type `U` or domain errors of type `E` written via [`Bi::send`]
///
/// The trait intentionally exposes only the operations the protocol layer needs,
/// allowing it to work with gRPC streams and other transport implementations.
///
/// # Stream termination and errors
///
/// [`Bi::recv`] returns:
/// - `Some(item)` when a new inbound message is available
/// - `None` when the inbound stream ends or the underlying transport reports an error
///
/// Implementations may collapse transport-specific receive errors into `None`
/// when the protocol does not need to distinguish them from normal stream
/// termination.
pub trait Bi<T, U, E>: Send + Sync + 'static {
/// Sends one outbound result to the peer.
/// `Bi<Inbound, Outbound>` models a duplex channel with:
/// - inbound items of type `Inbound` read via [`Bi::recv`]
/// - outbound items of type `Outbound` written via [`Bi::send`]
pub trait Bi<Inbound, Outbound>: Send + Sync + 'static {
fn send(
&mut self,
item: Result<U, E>,
item: Outbound,
) -> impl std::future::Future<Output = Result<(), Error>> + Send;
/// Receives the next inbound item.
///
/// Returns `None` when the inbound stream is finished or can no longer
/// produce items.
fn recv(&mut self) -> impl std::future::Future<Output = Option<T>> + Send;
fn recv(&mut self) -> impl std::future::Future<Output = Option<Inbound>> + Send;
}
/// [`Bi`] adapter backed by a tonic gRPC bidirectional stream.
///
/// Outbound items are sent through a Tokio MPSC sender, while inbound items are
/// read from tonic [`Streaming`].
pub struct GrpcAdapter<Inbound, Outbound, E> {
sender: mpsc::Sender<Result<Outbound, Status>>,
receiver: Streaming<Inbound>,
_error: PhantomData<E>,
/// 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;
}
impl<Inbound, Outbound, E> GrpcAdapter<Inbound, Outbound, E> {
/// Converts protocol/domain outbound items into transport-facing outbound items.
pub trait SendConverter: Send + Sync + 'static {
type Input;
type Output;
/// Creates a new gRPC-backed [`Bi`] adapter.
pub fn new(sender: mpsc::Sender<Result<Outbound, Status>>, receiver: Streaming<Inbound>) -> Self {
Self {
sender,
receiver,
_error: PhantomData,
}
}
fn convert(&self, item: Self::Input) -> Self::Output;
}
impl<Inbound, Outbound, E> Bi<Inbound, Outbound, E> for GrpcAdapter<Inbound, Outbound, E>
where
Inbound: Send + 'static,
Outbound: Send + 'static,
E: Into<Status> + Send + Sync + 'static,
{
#[tracing::instrument(level = "trace", skip(self, item))]
async fn send(&mut self, item: Result<Outbound, E>) -> Result<(), Error> {
self.sender
.send(item.map_err(Into::into))
.await
.map_err(|_| Error::ChannelClosed)
}
#[tracing::instrument(level = "trace", skip(self))]
async fn recv(&mut self) -> Option<Inbound> {
self.receiver.next().await.transpose().ok().flatten()
}
/// A [`RecvConverter`] that forwards values unchanged.
pub struct IdentityRecvConverter<T> {
_marker: PhantomData<T>,
}
/// No-op [`Bi`] transport for tests and manual actor usage.
///
/// `send` drops all items and succeeds. [`Bi::recv`] never resolves and therefore
/// does not busy-wait or spuriously close the stream.
pub struct DummyTransport<T, U, E> {
_marker: PhantomData<(T, U, E)>,
}
impl<T, U, E> DummyTransport<T, U, E> {
impl<T> IdentityRecvConverter<T> {
pub fn new() -> Self {
Self {
_marker: PhantomData,
@@ -100,23 +125,166 @@ impl<T, U, E> DummyTransport<T, U, E> {
}
}
impl<T, U, E> Default for DummyTransport<T, U, E> {
impl<T> Default for IdentityRecvConverter<T> {
fn default() -> Self {
Self::new()
}
}
impl<T, U, E> Bi<T, U, E> for DummyTransport<T, U, E>
impl<T> RecvConverter for IdentityRecvConverter<T>
where
T: Send + Sync + 'static,
U: Send + Sync + 'static,
E: Send + Sync + 'static,
{
async fn send(&mut self, _item: Result<U, E>) -> Result<(), Error> {
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 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,
}
}
}
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
/// does not busy-wait or spuriously close the stream.
pub struct DummyTransport<Inbound, Outbound> {
_marker: PhantomData<(Inbound, Outbound)>,
}
impl<Inbound, Outbound> DummyTransport<Inbound, Outbound> {
pub fn new() -> Self {
Self {
_marker: PhantomData,
}
}
}
impl<Inbound, Outbound> Default for DummyTransport<Inbound, Outbound> {
fn default() -> Self {
Self::new()
}
}
impl<Inbound, Outbound> Bi<Inbound, Outbound> for DummyTransport<Inbound, Outbound>
where
Inbound: Send + Sync + 'static,
Outbound: Send + Sync + 'static,
{
async fn send(&mut self, _item: Outbound) -> Result<(), Error> {
Ok(())
}
fn recv(&mut self) -> impl std::future::Future<Output = Option<T>> + Send {
fn recv(&mut self) -> impl std::future::Future<Output = Option<Inbound>> + Send {
async {
std::future::pending::<()>().await;
None

View File

@@ -7,6 +7,6 @@ use crate::ServerContext;
pub(crate) async fn handle_client(
_context: ServerContext,
_bistream: impl Bi<ClientRequest, ClientResponse, tonic::Status>,
_bistream: impl Bi<ClientRequest, ClientResponse>,
) {
}

View File

@@ -21,7 +21,6 @@ use ed25519_dalek::VerifyingKey;
use kameo::{Actor, error::SendError};
use memsafe::MemSafe;
use tokio::select;
use tonic::Status;
use tracing::{error, info};
use x25519_dalek::{EphemeralSecret, PublicKey};
@@ -77,53 +76,9 @@ pub enum UserAgentError {
DatabaseOperationFailed,
}
impl From<UserAgentError> for Status {
fn from(value: UserAgentError) -> Self {
match value {
UserAgentError::MissingRequestPayload | UserAgentError::UnexpectedRequestPayload => {
Status::invalid_argument("Expected message with payload")
}
UserAgentError::InvalidStateForChallengeSolution => {
Status::invalid_argument("Invalid state for challenge solution")
}
UserAgentError::InvalidStateForUnsealEncryptedKey => {
Status::failed_precondition("Invalid state for unseal encrypted key")
}
UserAgentError::InvalidClientPubkeyLength => {
Status::invalid_argument("client_pubkey must be 32 bytes")
}
UserAgentError::InvalidAuthPubkeyLength => {
Status::invalid_argument("Expected pubkey to have specific length")
}
UserAgentError::InvalidAuthPubkeyEncoding => {
Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
}
UserAgentError::InvalidSignatureLength => {
Status::invalid_argument("Invalid signature length")
}
UserAgentError::InvalidBootstrapToken => {
Status::invalid_argument("Invalid bootstrap token")
}
UserAgentError::PublicKeyNotRegistered => {
Status::unauthenticated("Public key not registered")
}
UserAgentError::InvalidChallengeSolution => {
Status::unauthenticated("Invalid challenge solution")
}
UserAgentError::StateTransitionFailed => Status::internal("State machine error"),
UserAgentError::BootstrapperActorUnreachable => {
Status::internal("Bootstrap token consumption failed")
}
UserAgentError::KeyHolderActorUnreachable => Status::internal("Vault is not available"),
UserAgentError::DatabasePoolUnavailable => Status::internal("Database pool error"),
UserAgentError::DatabaseOperationFailed => Status::internal("Database error"),
}
}
}
pub struct UserAgentActor<Transport>
where
Transport: Bi<UserAgentRequest, UserAgentResponse, UserAgentError>,
Transport: Bi<UserAgentRequest, Result<UserAgentResponse, UserAgentError>>,
{
db: db::DatabasePool,
actors: GlobalActors,
@@ -133,7 +88,7 @@ where
impl<Transport> UserAgentActor<Transport>
where
Transport: Bi<UserAgentRequest, UserAgentResponse, UserAgentError>,
Transport: Bi<UserAgentRequest, Result<UserAgentResponse, UserAgentError>>,
{
pub(crate) fn new(context: ServerContext, transport: Transport) -> Self {
Self {
@@ -322,7 +277,7 @@ fn unseal_response(payload: UserAgentResponsePayload) -> UserAgentResponse {
impl<Transport> UserAgentActor<Transport>
where
Transport: Bi<UserAgentRequest, UserAgentResponse, UserAgentError>,
Transport: Bi<UserAgentRequest, Result<UserAgentResponse, UserAgentError>>,
{
async fn handle_unseal_request(&mut self, req: UnsealStart) -> Output {
let secret = EphemeralSecret::random();
@@ -470,7 +425,7 @@ where
impl<Transport> Actor for UserAgentActor<Transport>
where
Transport: Bi<UserAgentRequest, UserAgentResponse, UserAgentError>,
Transport: Bi<UserAgentRequest, Result<UserAgentResponse, UserAgentError>>,
{
type Args = Self;
@@ -521,7 +476,7 @@ where
}
impl UserAgentActor<DummyTransport<UserAgentRequest, UserAgentResponse, UserAgentError>> {
impl UserAgentActor<DummyTransport<UserAgentRequest, Result<UserAgentResponse, UserAgentError>>> {
pub fn new_manual(db: db::DatabasePool, actors: GlobalActors) -> Self {
Self {
db,
@@ -530,4 +485,4 @@ impl UserAgentActor<DummyTransport<UserAgentRequest, UserAgentResponse, UserAgen
transport: DummyTransport::new(),
}
}
}
}

View File

@@ -1,24 +0,0 @@
use tonic::Status;
use tracing::error;
pub trait GrpcStatusExt<T> {
fn to_status(self) -> Result<T, Status>;
}
impl<T> GrpcStatusExt<T> for Result<T, diesel::result::Error> {
fn to_status(self) -> Result<T, Status> {
self.map_err(|e| {
error!(error = ?e, "Database error");
Status::internal("Database error")
})
}
}
impl<T> GrpcStatusExt<T> for Result<T, crate::db::PoolError> {
fn to_status(self) -> Result<T, Status> {
self.map_err(|e| {
error!(error = ?e, "Database pool error");
Status::internal("Database pool error")
})
}
}

View File

@@ -1,7 +1,7 @@
#![forbid(unsafe_code)]
use arbiter_proto::{
proto::{ClientRequest, ClientResponse, UserAgentRequest, UserAgentResponse},
transport::GrpcAdapter,
transport::{IdentityRecvConverter, SendConverter, grpc},
};
use async_trait::async_trait;
use kameo::actor::Spawn;
@@ -12,17 +12,79 @@ use tonic::{Request, Response, Status};
use tracing::info;
use crate::{
actors::user_agent::UserAgentActor,
actors::user_agent::{UserAgentActor, UserAgentError},
context::ServerContext,
};
pub mod actors;
pub mod context;
pub mod db;
mod errors;
const DEFAULT_CHANNEL_SIZE: usize = 1000;
/// Converts User Agent domain outbounds into the tonic stream item emitted by
/// the server.§
///
/// The conversion is defined at the server boundary so the actor module remains
/// focused on domain semantics and does not depend on tonic status encoding.
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)),
}
}
}
/// Maps User Agent domain errors to public gRPC transport errors for the
/// `user_agent` streaming endpoint.
fn user_agent_error_status(value: UserAgentError) -> Status {
match value {
UserAgentError::MissingRequestPayload | UserAgentError::UnexpectedRequestPayload => {
Status::invalid_argument("Expected message with payload")
}
UserAgentError::InvalidStateForChallengeSolution => {
Status::invalid_argument("Invalid state for challenge solution")
}
UserAgentError::InvalidStateForUnsealEncryptedKey => {
Status::failed_precondition("Invalid state for unseal encrypted key")
}
UserAgentError::InvalidClientPubkeyLength => {
Status::invalid_argument("client_pubkey must be 32 bytes")
}
UserAgentError::InvalidAuthPubkeyLength => {
Status::invalid_argument("Expected pubkey to have specific length")
}
UserAgentError::InvalidAuthPubkeyEncoding => {
Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
}
UserAgentError::InvalidSignatureLength => {
Status::invalid_argument("Invalid signature length")
}
UserAgentError::InvalidBootstrapToken => {
Status::invalid_argument("Invalid bootstrap token")
}
UserAgentError::PublicKeyNotRegistered => {
Status::unauthenticated("Public key not registered")
}
UserAgentError::InvalidChallengeSolution => {
Status::unauthenticated("Invalid challenge solution")
}
UserAgentError::StateTransitionFailed => Status::internal("State machine error"),
UserAgentError::BootstrapperActorUnreachable => {
Status::internal("Bootstrap token consumption failed")
}
UserAgentError::KeyHolderActorUnreachable => Status::internal("Vault is not available"),
UserAgentError::DatabasePoolUnavailable => Status::internal("Database pool error"),
UserAgentError::DatabaseOperationFailed => Status::internal("Database error"),
}
}
pub struct Server {
context: ServerContext,
}
@@ -53,9 +115,13 @@ impl arbiter_proto::proto::arbiter_service_server::ArbiterService for Server {
let req_stream = request.into_inner();
let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
let adapter = GrpcAdapter::new(tx, req_stream);
UserAgentActor::spawn(UserAgentActor::new(self.context.clone(), adapter));
let transport = grpc::GrpcAdapter::new(
tx,
req_stream,
IdentityRecvConverter::<UserAgentRequest>::new(),
UserAgentGrpcSender,
);
UserAgentActor::spawn(UserAgentActor::new(self.context.clone(), transport));
info!(event = "connection established", "grpc.user_agent");

View File

@@ -92,8 +92,6 @@ pub async fn test_bootstrap_invalid_token_auth() {
match result {
Err(err) => {
assert_eq!(err, UserAgentError::InvalidBootstrapToken);
let status: tonic::Status = err.into();
assert_eq!(status.code(), tonic::Code::InvalidArgument);
}
Ok(_) => {
panic!("Expected error due to invalid bootstrap token, but got success");

View File

@@ -18,7 +18,8 @@ use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
use memsafe::MemSafe;
use x25519_dalek::{EphemeralSecret, PublicKey};
type TestUserAgent = UserAgentActor<DummyTransport<UserAgentRequest, UserAgentResponse, UserAgentError>>;
type TestUserAgent =
UserAgentActor<DummyTransport<UserAgentRequest, Result<UserAgentResponse, UserAgentError>>>;
fn auth_request(payload: ClientAuthPayload) -> UserAgentRequest {
UserAgentRequest {

View File

@@ -9,7 +9,12 @@ 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
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"] }

View File

@@ -0,0 +1,71 @@
use arbiter_proto::{
proto::{
UserAgentRequest, UserAgentResponse, arbiter_service_client::ArbiterServiceClient,
},
transport::{IdentityRecvConverter, IdentitySendConverter, RecvConverter, 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)
}

View File

@@ -1,13 +1,209 @@
use ed25519_dalek::SigningKey;
use kameo::Actor;
use tonic::transport::CertificateDer;
use arbiter_proto::{
format_challenge,
proto::{
UserAgentRequest, UserAgentResponse,
auth::{
self, AuthChallengeRequest, AuthOk, ClientMessage as AuthClientMessage,
ServerMessage as AuthServerMessage, client_message::Payload as ClientAuthPayload,
server_message::Payload as ServerAuthPayload,
},
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};
struct Storage {
pub identity: SigningKey,
pub server_ca_cert: CertificateDer<'static>,
statemachine! {
name: UserAgent,
custom_error: false,
transitions: {
*Init + SentAuthChallengeRequest = WaitingForServerAuth,
WaitingForServerAuth + ReceivedAuthChallenge = WaitingForAuthOk,
WaitingForServerAuth + ReceivedAuthOk = Authenticated,
WaitingForAuthOk + ReceivedAuthOk = Authenticated,
}
}
#[derive(Actor)]
pub struct UserAgent {
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(())
}
fn auth_request(payload: ClientAuthPayload) -> UserAgentRequest {
UserAgentRequest {
payload: Some(UserAgentRequestPayload::AuthMessage(AuthClientMessage {
payload: Some(payload),
})),
}
}
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(Self::auth_request(ClientAuthPayload::AuthChallengeRequest(
req,
)))
.await
.map_err(|_| InboundError::TransportSendFailed)?;
info!(actor = "useragent", "auth.request.sent");
Ok(())
}
async fn handle_auth_challenge(
&mut self,
challenge: auth::AuthChallenge,
) -> Result<(), InboundError> {
self.transition(UserAgentEvents::ReceivedAuthChallenge)?;
let formatted = format_challenge(&challenge);
let signature = self.key.sign(&formatted);
let solution = auth::AuthChallengeSolution {
signature: signature.to_bytes().to_vec(),
};
self.transport
.send(Self::auth_request(
ClientAuthPayload::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::AuthMessage(AuthServerMessage {
payload: Some(ServerAuthPayload::AuthChallenge(challenge)),
}) => self.handle_auth_challenge(challenge).await,
UserAgentResponsePayload::AuthMessage(AuthServerMessage {
payload: Some(ServerAuthPayload::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};

View File

@@ -0,0 +1,151 @@
use arbiter_proto::{
format_challenge,
proto::{
UserAgentRequest, UserAgentResponse,
auth::{
AuthChallenge, AuthOk, ClientMessage as AuthClientMessage,
ServerMessage as AuthServerMessage, client_message::Payload as ClientAuthPayload,
server_message::Payload as ServerAuthPayload,
},
user_agent_request::Payload as UserAgentRequestPayload,
user_agent_response::Payload as UserAgentResponsePayload,
},
transport::Bi,
};
use arbiter_useragent::{InboundError, UserAgentActor};
use ed25519_dalek::SigningKey;
use kameo::actor::Spawn;
use tokio::sync::mpsc;
use tokio::time::{Duration, timeout};
struct TestTransport {
inbound_rx: mpsc::Receiver<UserAgentResponse>,
outbound_tx: mpsc::Sender<UserAgentRequest>,
}
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])
}
fn auth_response(payload: ServerAuthPayload) -> UserAgentResponse {
UserAgentResponse {
payload: Some(UserAgentResponsePayload::AuthMessage(AuthServerMessage {
payload: Some(payload),
})),
}
}
#[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::AuthMessage(AuthClientMessage {
payload: Some(ClientAuthPayload::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(auth_response(ServerAuthPayload::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::AuthMessage(AuthClientMessage {
payload: Some(ClientAuthPayload::AuthChallengeSolution(solution)),
})),
} = outbound
else {
panic!("expected auth challenge solution");
};
let formatted = format_challenge(&challenge);
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(auth_response(ServerAuthPayload::AuthOk(AuthOk {})))
.await
.unwrap();
drop(inbound_tx);
drop(actor);
}