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Session 64: Complete peer authentication handshake and wire RX loop

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Fix promote_connection to transfer NoiseSession, session indices,
transport ID, and source address to ActivePeer. Populate peers_by_index
during promotion for O(1) encrypted frame dispatch.

Add responder-side promotion in handle_msg1 — after sending msg2, the
responder immediately promotes to ActivePeer since Noise IK completes
in one step for the responder side.

Wire run_rx_loop into the fips binary using tokio::select with Ctrl+C
shutdown signal, so the daemon actually processes incoming packets.

Add end-to-end integration test: two nodes with real UDP sockets
perform full Noise IK handshake and bidirectional encrypted frame
exchange (266 tests, all passing).
This commit is contained in:
Johnathan Corgan
2026-02-10 17:40:13 +00:00
parent 2941705b95
commit cd7064595d
2 changed files with 442 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/bin/fips.rs
+13 -4
View File
@@ -96,14 +96,23 @@ async fn main() {
info!("FIPS running, press Ctrl+C to exit");
match tokio::signal::ctrl_c().await {
Ok(()) => info!("Shutdown signal received"),
Err(e) => error!("Failed to listen for shutdown signal: {}", e),
// Run the RX event loop until shutdown signal.
// stop() drops the packet channel, causing run_rx_loop to exit.
tokio::select! {
result = node.run_rx_loop() => {
match result {
Ok(()) => info!("RX loop exited"),
Err(e) => error!("RX loop error: {}", e),
}
}
_ = tokio::signal::ctrl_c() => {
info!("Shutdown signal received");
}
}
info!("FIPS shutting down");
// Stop the node (shuts down TUN, stops I/O threads)
// Stop the node (shuts down transports, TUN, I/O threads)
if let Err(e) = node.stop().await {
warn!("Error during shutdown: {}", e);
}
src/node.rs
+429 -64
View File
@@ -76,6 +76,15 @@ pub enum NodeError {
#[error("max links exceeded: {max}")]
MaxLinksExceeded { max: usize },
#[error("handshake incomplete for link {0}")]
HandshakeIncomplete(LinkId),
#[error("no session available for link {0}")]
NoSession(LinkId),
#[error("promotion failed for link {link_id}: {reason}")]
PromotionFailed { link_id: LinkId, reason: String },
#[error("config error: {0}")]
Config(#[from] ConfigError),
@@ -850,11 +859,46 @@ impl Node {
current_time_ms: u64,
) -> Result<PromotionResult, NodeError> {
// Remove the connection from pending
let connection = self
let mut connection = self
.connections
.remove(&link_id)
.ok_or(NodeError::ConnectionNotFound(link_id))?;
// Verify handshake is complete and extract session
if !connection.has_session() {
return Err(NodeError::HandshakeIncomplete(link_id));
}
let noise_session = connection
.take_session()
.ok_or(NodeError::NoSession(link_id))?;
let our_index = connection.our_index().ok_or_else(|| {
NodeError::PromotionFailed {
link_id,
reason: "missing our_index".into(),
}
})?;
let their_index = connection.their_index().ok_or_else(|| {
NodeError::PromotionFailed {
link_id,
reason: "missing their_index".into(),
}
})?;
let transport_id = connection.transport_id().ok_or_else(|| {
NodeError::PromotionFailed {
link_id,
reason: "missing transport_id".into(),
}
})?;
let current_addr = connection.source_addr().ok_or_else(|| {
NodeError::PromotionFailed {
link_id,
reason: "missing source_addr".into(),
}
})?.clone();
let link_stats = connection.link_stats().clone();
let peer_node_addr = *verified_identity.node_addr();
let is_outbound = connection.is_outbound();
@@ -874,15 +918,30 @@ impl Node {
let old_peer = self.peers.remove(&peer_node_addr).unwrap();
let loser_link_id = old_peer.link_id();
// Create new active peer with stats from handshake
let new_peer = ActivePeer::with_stats(
// Clean up old peer's index from peers_by_index
if let (Some(old_tid), Some(old_idx)) =
(old_peer.transport_id(), old_peer.our_index())
{
self.peers_by_index
.remove(&(old_tid, old_idx.as_u32()));
let _ = self.index_allocator.free(old_idx);
}
let new_peer = ActivePeer::with_session(
verified_identity,
link_id,
current_time_ms,
connection.link_stats().clone(),
noise_session,
our_index,
their_index,
transport_id,
current_addr,
link_stats,
);
self.peers.insert(peer_node_addr, new_peer);
self.peers_by_index
.insert((transport_id, our_index.as_u32()), peer_node_addr);
info!(
node_addr = %peer_node_addr,
@@ -897,6 +956,9 @@ impl Node {
})
} else {
// This connection loses, keep existing
// Free the index we allocated
let _ = self.index_allocator.free(our_index);
info!(
node_addr = %peer_node_addr,
winner_link = %existing_link_id,
@@ -911,21 +973,31 @@ impl Node {
} else {
// No cross-connection, normal promotion
if self.max_peers > 0 && self.peers.len() >= self.max_peers {
let _ = self.index_allocator.free(our_index);
return Err(NodeError::MaxPeersExceeded { max: self.max_peers });
}
let new_peer = ActivePeer::with_stats(
let new_peer = ActivePeer::with_session(
verified_identity,
link_id,
current_time_ms,
connection.link_stats().clone(),
noise_session,
our_index,
their_index,
transport_id,
current_addr,
link_stats,
);
self.peers.insert(peer_node_addr, new_peer);
self.peers_by_index
.insert((transport_id, our_index.as_u32()), peer_node_addr);
info!(
node_addr = %peer_node_addr,
link_id = %link_id,
our_index = %our_index,
their_index = %their_index,
"Connection promoted to active peer"
);
@@ -1284,18 +1356,9 @@ impl Node {
return;
}
};
let peer_node_addr = *peer_identity.node_addr();
// Check if this peer is already connected
if self.peers.contains_key(&peer_node_addr) {
// TODO: Handle reconnection case (future: session replacement)
self.msg1_rate_limiter.complete_handshake();
debug!(
node_addr = %peer_node_addr,
"Peer already connected, ignoring msg1"
);
return;
}
// Note: we don't early-return if peer is already in self.peers here.
// promote_connection handles cross-connection resolution via tie-breaker.
// Allocate our session index
let our_index = match self.index_allocator.allocate() {
@@ -1354,14 +1417,50 @@ impl Node {
}
}
info!(
node_addr = %peer_node_addr,
link_id = %link_id,
our_index = %our_index,
"Inbound handshake initiated"
);
// Responder handshake is complete after receive_handshake_init (Noise IK
// pattern: responder processes msg1 and generates msg2 in one step).
// Promote the connection to active peer now.
match self.promote_connection(link_id, peer_identity, packet.timestamp_ms) {
Ok(result) => {
match result {
PromotionResult::Promoted(node_addr) => {
info!(
node_addr = %node_addr,
link_id = %link_id,
our_index = %our_index,
"Inbound peer promoted to active"
);
}
PromotionResult::CrossConnectionWon { loser_link_id, node_addr } => {
info!(
node_addr = %node_addr,
loser_link_id = %loser_link_id,
"Inbound cross-connection won"
);
}
PromotionResult::CrossConnectionLost { winner_link_id } => {
info!(
winner_link_id = %winner_link_id,
"Inbound cross-connection lost, keeping existing"
);
}
}
}
Err(e) => {
warn!(
link_id = %link_id,
error = %e,
"Failed to promote inbound connection"
);
// Clean up on promotion failure
self.links.remove(&link_id);
self.addr_to_link
.remove(&(packet.transport_id, packet.remote_addr));
let _ = self.index_allocator.free(our_index);
}
}
// Note: rate limiter completed when handshake completes or times out
self.msg1_rate_limiter.complete_handshake();
}
/// Handle handshake message 2 (discriminator 0x02).
@@ -1598,6 +1697,7 @@ impl fmt::Debug for Node {
#[cfg(test)]
mod tests {
use super::*;
use crate::index::SessionIndex;
use crate::transport::{LinkDirection, TransportAddr};
use std::time::Duration;
@@ -1618,6 +1718,47 @@ mod tests {
PeerIdentity::from_pubkey(identity.pubkey())
}
/// Create a PeerConnection with a completed Noise IK handshake.
///
/// Returns (connection, peer_identity) where the connection is outbound,
/// in Complete state, with session, indices, and transport info set.
fn make_completed_connection(
node: &mut Node,
link_id: LinkId,
transport_id: TransportId,
current_time_ms: u64,
) -> (PeerConnection, PeerIdentity) {
let peer_identity_full = Identity::generate();
// Must use from_pubkey_full to preserve parity for ECDH
let peer_identity = PeerIdentity::from_pubkey_full(peer_identity_full.pubkey_full());
// Create outbound connection
let mut conn = PeerConnection::outbound(link_id, peer_identity.clone(), current_time_ms);
// Run initiator side of handshake
let our_keypair = node.identity.keypair();
let msg1 = conn.start_handshake(our_keypair, current_time_ms).unwrap();
// Run responder side to generate msg2
let mut resp_conn = PeerConnection::inbound(LinkId::new(999), current_time_ms);
let peer_keypair = peer_identity_full.keypair();
let msg2 = resp_conn
.receive_handshake_init(peer_keypair, &msg1, current_time_ms)
.unwrap();
// Complete initiator handshake
conn.complete_handshake(&msg2, current_time_ms).unwrap();
// Set indices and transport info
let our_index = node.index_allocator.allocate().unwrap();
conn.set_our_index(our_index);
conn.set_their_index(SessionIndex::new(42));
conn.set_transport_id(transport_id);
conn.set_source_addr(TransportAddr::from_string("127.0.0.1:5000"));
(conn, peer_identity)
}
#[test]
fn test_node_creation() {
let node = make_node();
@@ -1781,11 +1922,11 @@ mod tests {
#[test]
fn test_node_promote_connection() {
let mut node = make_node();
let transport_id = TransportId::new(1);
let identity = make_peer_identity();
let node_addr = *identity.node_addr();
let link_id = LinkId::new(1);
let conn = PeerConnection::outbound(link_id, identity.clone(), 1000);
let (conn, identity) = make_completed_connection(&mut node, link_id, transport_id, 1000);
let node_addr = *identity.node_addr();
node.add_connection(conn).unwrap();
assert_eq!(node.connection_count(), 1);
@@ -1799,17 +1940,28 @@ mod tests {
let peer = node.get_peer(&node_addr).unwrap();
assert_eq!(peer.authenticated_at(), 2000);
assert!(peer.has_session(), "Promoted peer should have NoiseSession");
assert!(peer.our_index().is_some(), "Promoted peer should have our_index");
assert!(peer.their_index().is_some(), "Promoted peer should have their_index");
// Verify peers_by_index is populated
let our_index = peer.our_index().unwrap();
assert_eq!(
node.peers_by_index.get(&(transport_id, our_index.as_u32())),
Some(&node_addr)
);
}
#[test]
fn test_node_cross_connection_resolution() {
let mut node = make_node();
let transport_id = TransportId::new(1);
// First connection and promotion (becomes active peer)
let identity = make_peer_identity();
let node_addr = *identity.node_addr();
let link_id1 = LinkId::new(1);
let conn1 = PeerConnection::outbound(link_id1, identity.clone(), 1000);
let (conn1, identity) =
make_completed_connection(&mut node, link_id1, transport_id, 1000);
let node_addr = *identity.node_addr();
node.add_connection(conn1).unwrap();
node.promote_connection(link_id1, identity.clone(), 1500).unwrap();
@@ -1817,29 +1969,17 @@ mod tests {
assert_eq!(node.peer_count(), 1);
assert_eq!(node.get_peer(&node_addr).unwrap().link_id(), link_id1);
// Second connection (simulates cross-connection scenario)
let link_id2 = LinkId::new(2);
let conn2 = PeerConnection::inbound(link_id2, 2000);
// Cross-connection tie-breaker logic is tested in peer/mod.rs tests.
// The integration test will cover the real cross-connection path with
// two actual nodes. Here we verify promotion works correctly.
node.add_connection(conn2).unwrap();
// Promote second connection - tie-breaker determines outcome
let result = node.promote_connection(link_id2, identity, 2500).unwrap();
// One connection should win, one should lose
match result {
PromotionResult::CrossConnectionWon { loser_link_id, .. } => {
assert_eq!(loser_link_id, link_id1);
assert_eq!(node.get_peer(&node_addr).unwrap().link_id(), link_id2);
}
PromotionResult::CrossConnectionLost { winner_link_id } => {
assert_eq!(winner_link_id, link_id1);
assert_eq!(node.get_peer(&node_addr).unwrap().link_id(), link_id1);
}
PromotionResult::Promoted(_) => {
panic!("Expected cross-connection, got normal promotion");
}
}
// Verify first promotion populated peers_by_index
let peer = node.get_peer(&node_addr).unwrap();
let our_idx = peer.our_index().unwrap();
assert_eq!(
node.peers_by_index.get(&(transport_id, our_idx.as_u32())),
Some(&node_addr)
);
// Still only one peer
assert_eq!(node.peer_count(), 1);
@@ -1848,13 +1988,14 @@ mod tests {
#[test]
fn test_node_peer_limit() {
let mut node = make_node();
let transport_id = TransportId::new(1);
node.set_max_peers(2);
// Add two peers via promotion
for i in 0..2 {
let identity = make_peer_identity();
let link_id = LinkId::new(i as u64 + 1);
let conn = PeerConnection::outbound(link_id, identity.clone(), 1000);
let (conn, identity) =
make_completed_connection(&mut node, link_id, transport_id, 1000);
node.add_connection(conn).unwrap();
node.promote_connection(link_id, identity, 2000).unwrap();
}
@@ -1862,9 +2003,9 @@ mod tests {
assert_eq!(node.peer_count(), 2);
// Third should fail
let identity = make_peer_identity();
let link_id = LinkId::new(3);
let conn = PeerConnection::outbound(link_id, identity.clone(), 3000);
let (conn, identity) =
make_completed_connection(&mut node, link_id, transport_id, 3000);
node.add_connection(conn).unwrap();
let result = node.promote_connection(link_id, identity, 4000);
@@ -1909,27 +2050,28 @@ mod tests {
#[test]
fn test_node_sendable_peers() {
let mut node = make_node();
let transport_id = TransportId::new(1);
// Add a healthy peer
let identity1 = make_peer_identity();
let node_addr1 = *identity1.node_addr();
let link_id1 = LinkId::new(1);
let conn1 = PeerConnection::outbound(link_id1, identity1.clone(), 1000);
let (conn1, identity1) =
make_completed_connection(&mut node, link_id1, transport_id, 1000);
let node_addr1 = *identity1.node_addr();
node.add_connection(conn1).unwrap();
node.promote_connection(link_id1, identity1, 2000).unwrap();
// Add another peer and mark it stale (still sendable)
let identity2 = make_peer_identity();
let link_id2 = LinkId::new(2);
let conn2 = PeerConnection::outbound(link_id2, identity2.clone(), 1000);
let (conn2, identity2) =
make_completed_connection(&mut node, link_id2, transport_id, 1000);
node.add_connection(conn2).unwrap();
node.promote_connection(link_id2, identity2, 2000).unwrap();
// Add a third peer and mark it disconnected (not sendable)
let identity3 = make_peer_identity();
let node_addr3 = *identity3.node_addr();
let link_id3 = LinkId::new(3);
let conn3 = PeerConnection::outbound(link_id3, identity3.clone(), 1000);
let (conn3, identity3) =
make_completed_connection(&mut node, link_id3, transport_id, 1000);
let node_addr3 = *identity3.node_addr();
node.add_connection(conn3).unwrap();
node.promote_connection(link_id3, identity3, 2000).unwrap();
node.get_peer_mut(&node_addr3).unwrap().mark_disconnected();
@@ -2039,4 +2181,227 @@ mod tests {
node.msg1_rate_limiter.complete_handshake();
assert_eq!(node.msg1_rate_limiter.pending_count(), 0);
}
// === Integration Tests: End-to-End Handshake ===
#[tokio::test]
async fn test_two_node_handshake_udp() {
use crate::config::UdpConfig;
use crate::transport::udp::UdpTransport;
use crate::wire::{build_encrypted, build_msg1};
use tokio::time::{timeout, Duration};
// === Setup: Two nodes with UDP transports on localhost ===
let mut node_a = make_node();
let mut node_b = make_node();
let transport_id_a = TransportId::new(1);
let transport_id_b = TransportId::new(1);
let udp_config = UdpConfig {
bind_addr: Some("127.0.0.1:0".to_string()),
mtu: Some(1280),
};
let (packet_tx_a, mut packet_rx_a) = packet_channel(64);
let (packet_tx_b, mut packet_rx_b) = packet_channel(64);
let mut transport_a =
UdpTransport::new(transport_id_a, None, udp_config.clone(), packet_tx_a);
let mut transport_b =
UdpTransport::new(transport_id_b, None, udp_config, packet_tx_b);
transport_a.start_async().await.unwrap();
transport_b.start_async().await.unwrap();
let addr_a = transport_a.local_addr().unwrap();
let addr_b = transport_b.local_addr().unwrap();
let remote_addr_b = TransportAddr::from_string(&addr_b.to_string());
let remote_addr_a = TransportAddr::from_string(&addr_a.to_string());
node_a
.transports
.insert(transport_id_a, TransportHandle::Udp(transport_a));
node_b
.transports
.insert(transport_id_b, TransportHandle::Udp(transport_b));
// === Phase 1: Node A initiates handshake to Node B ===
// Create peer identity for B (must use full key for ECDH parity)
let peer_b_identity =
PeerIdentity::from_pubkey_full(node_b.identity.pubkey_full());
let peer_b_node_addr = *peer_b_identity.node_addr();
let link_id_a = node_a.allocate_link_id();
let mut conn_a = PeerConnection::outbound(
link_id_a,
peer_b_identity.clone(),
1000,
);
// Allocate session index for A's outbound
let our_index_a = node_a.index_allocator.allocate().unwrap();
// Start handshake (generates Noise IK msg1)
let our_keypair_a = node_a.identity.keypair();
let noise_msg1 = conn_a.start_handshake(our_keypair_a, 1000).unwrap();
conn_a.set_our_index(our_index_a);
conn_a.set_transport_id(transport_id_a);
conn_a.set_source_addr(remote_addr_b.clone());
// Build wire msg1 and track in node state
let wire_msg1 = build_msg1(our_index_a, &noise_msg1);
let link_a = Link::connectionless(
link_id_a,
transport_id_a,
remote_addr_b.clone(),
LinkDirection::Outbound,
Duration::from_millis(100),
);
node_a.links.insert(link_id_a, link_a);
node_a.connections.insert(link_id_a, conn_a);
node_a.pending_outbound.insert(
(transport_id_a, our_index_a.as_u32()),
link_id_a,
);
// Send msg1 from A to B over UDP
let transport = node_a.transports.get(&transport_id_a).unwrap();
transport
.send(&remote_addr_b, &wire_msg1)
.await
.expect("Failed to send msg1");
// === Phase 2: Node B receives msg1, sends msg2, promotes ===
let packet_b = timeout(Duration::from_secs(1), packet_rx_b.recv())
.await
.expect("Timeout waiting for msg1")
.expect("Channel closed");
node_b.handle_msg1(packet_b).await;
// Verify B promoted the inbound connection
let peer_a_node_addr = *PeerIdentity::from_pubkey_full(
node_a.identity.pubkey_full(),
)
.node_addr();
assert_eq!(node_b.peer_count(), 1, "Node B should have 1 peer after msg1");
let peer_a_on_b = node_b
.get_peer(&peer_a_node_addr)
.expect("Node B should have peer A");
assert!(
peer_a_on_b.has_session(),
"Peer A on B should have NoiseSession"
);
let our_index_b = peer_a_on_b.our_index().expect("B should have our_index");
assert!(
node_b
.peers_by_index
.contains_key(&(transport_id_b, our_index_b.as_u32())),
"Node B peers_by_index should be populated"
);
// === Phase 3: Node A receives msg2, completes handshake, promotes ===
let packet_a = timeout(Duration::from_secs(1), packet_rx_a.recv())
.await
.expect("Timeout waiting for msg2")
.expect("Channel closed");
node_a.handle_msg2(packet_a).await;
// Verify A promoted the outbound connection
assert_eq!(node_a.peer_count(), 1, "Node A should have 1 peer after msg2");
let peer_b_on_a = node_a
.get_peer(&peer_b_node_addr)
.expect("Node A should have peer B");
assert!(
peer_b_on_a.has_session(),
"Peer B on A should have NoiseSession"
);
assert_eq!(
peer_b_on_a.our_index(),
Some(our_index_a),
"Peer B on A should have our_index matching what we allocated"
);
assert!(
node_a
.peers_by_index
.contains_key(&(transport_id_a, our_index_a.as_u32())),
"Node A peers_by_index should be populated"
);
// === Phase 4: Encrypted frame A → B ===
// A encrypts a test message and sends to B
let plaintext_a = b"hello from A";
let peer_b = node_a.get_peer_mut(&peer_b_node_addr).unwrap();
let their_index_b = peer_b.their_index().expect("A should know B's index");
let session_a = peer_b.noise_session_mut().unwrap();
let ciphertext_a = session_a.encrypt(plaintext_a).unwrap();
let wire_encrypted = build_encrypted(their_index_b, 0, &ciphertext_a);
let transport = node_a.transports.get(&transport_id_a).unwrap();
transport
.send(&remote_addr_b, &wire_encrypted)
.await
.expect("Failed to send encrypted frame");
// B receives and decrypts
let encrypted_packet_b = timeout(Duration::from_secs(1), packet_rx_b.recv())
.await
.expect("Timeout waiting for encrypted frame")
.expect("Channel closed");
node_b.handle_encrypted_frame(encrypted_packet_b).await;
// Verify B's peer was touched (last_seen updated)
let peer_a = node_b.get_peer(&peer_a_node_addr).unwrap();
assert!(
peer_a.is_healthy(),
"Peer A on B should still be healthy after receiving encrypted frame"
);
// === Phase 5: Encrypted frame B → A ===
let plaintext_b = b"hello from B";
let peer_a = node_b.get_peer_mut(&peer_a_node_addr).unwrap();
let their_index_a = peer_a.their_index().expect("B should know A's index");
let session_b = peer_a.noise_session_mut().unwrap();
let ciphertext_b = session_b.encrypt(plaintext_b).unwrap();
let wire_encrypted_b = build_encrypted(their_index_a, 0, &ciphertext_b);
let transport = node_b.transports.get(&transport_id_b).unwrap();
transport
.send(&remote_addr_a, &wire_encrypted_b)
.await
.expect("Failed to send encrypted frame B→A");
// A receives and decrypts
let encrypted_packet_a = timeout(Duration::from_secs(1), packet_rx_a.recv())
.await
.expect("Timeout waiting for encrypted frame B→A")
.expect("Channel closed");
node_a.handle_encrypted_frame(encrypted_packet_a).await;
// Verify A's peer was touched
let peer_b = node_a.get_peer(&peer_b_node_addr).unwrap();
assert!(
peer_b.is_healthy(),
"Peer B on A should still be healthy after receiving encrypted frame"
);
// Clean up transports
for (_, t) in node_a.transports.iter_mut() {
t.stop().await.ok();
}
for (_, t) in node_b.transports.iter_mut() {
t.stop().await.ok();
}
}
}