Bump release candidate to rc6

Cargo.lock

@@ -436,7 +436,7 @@ dependencies = [
 
 [[package]]
 name = "dosh"
-version = "1.0.0-rc4"
+version = "1.0.0-rc6"
 dependencies = [
  "anyhow",
  "base64",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "dosh"
-version = "1.0.0-rc4"
+version = "1.0.0-rc6"
 edition = "2024"
 license = "MIT"
 

src/bin/dosh-client.rs

@@ -66,6 +66,8 @@ const STARTUP_INPUT_HOLD: Duration = Duration::from_millis(750);
 const POST_SUBMIT_ALL_INPUT_HOLD: Duration = Duration::from_millis(120);
 const STALE_TERMINAL_INPUT_AFTER: Duration = Duration::from_secs(2);
 const POST_RECONNECT_STALE_INPUT_GRACE: Duration = Duration::from_secs(2);
+const FOCUS_REPAINT_COOLDOWN: Duration = Duration::from_secs(1);
+const ALT_SCREEN_IDLE_REPAINT_AFTER: Duration = Duration::from_secs(15);
 
 /// Sentinel `target_host` the server uses on a server-initiated `StreamOpen` that
 /// represents an SSH-agent connection (rather than a TCP target). The client
@@ -4334,10 +4336,14 @@ async fn run_terminal(
     let mut startup_input_hold_until: Option<Instant> = None;
     let mut startup_gate_mode = StartupGateMode::HoldControl;
     let mut stale_terminal_input_suppress_until: Option<Instant> = None;
+    let mut last_terminal_frame_at = Instant::now();
+    let mut last_focus_repaint_at = Instant::now() - FOCUS_REPAINT_COOLDOWN;
+    let mut last_idle_repaint_attempt_at = Instant::now() - ALT_SCREEN_IDLE_REPAINT_AFTER;
     if let Some(frame) = first_frame {
         if !forward_only {
             render_frame(&frame)?;
             predictor.observe_output(&frame.bytes);
+            last_terminal_frame_at = Instant::now();
         }
         if frame.closed {
             return Ok(());
@@ -4395,6 +4401,41 @@ async fn run_terminal(
                         if input_matches_escape(&bytes, escape_key.as_deref()) {
                             break;
                         }
+                        if !forward_only
+                            && input_contains_focus_in(&bytes)
+                            && last_focus_repaint_at.elapsed() >= FOCUS_REPAINT_COOLDOWN
+                        {
+                            last_focus_repaint_at = Instant::now();
+                            if let Some(frame) = reconnect(
+                                &socket,
+                                &mut cred,
+                                &mut send_seq,
+                                last_size,
+                                &mut frame_buffer,
+                                &mut predictor,
+                            )
+                            .await?
+                            {
+                                refresh_live_addr(&mut addr, &cred)?;
+                                arm_stale_terminal_input_suppression(
+                                    &mut stale_terminal_input_suppress_until,
+                                );
+                                render_frame(&frame)?;
+                                predictor.observe_output(&frame.bytes);
+                                last_terminal_frame_at = Instant::now();
+                                last_packet_at = Instant::now();
+                                flush_pending_user_input(
+                                    &socket,
+                                    addr,
+                                    &cred,
+                                    &mut send_seq,
+                                    &mut predictor,
+                                    &mut pending_user_input,
+                                    &mut pending_user_input_bytes,
+                                )
+                                .await?;
+                            }
+                        }
                         if should_strip_stale_terminal_reports(
                             last_packet_at.elapsed(),
                             stale_terminal_input_suppress_until,
@@ -4508,6 +4549,7 @@ async fn run_terminal(
                                     if !forward_only {
                                         render_frame(&frame)?;
                                         predictor.observe_output(&frame.bytes);
+                                        last_terminal_frame_at = Instant::now();
                                     }
                                     last_packet_at = Instant::now();
                                     flush_pending_user_input(
@@ -4570,6 +4612,7 @@ async fn run_terminal(
                     if !forward_only {
                         render_frame(&frame)?;
                         predictor.observe_output(&frame.bytes);
+                        last_terminal_frame_at = Instant::now();
                     }
                     last_packet_at = Instant::now();
                     flush_pending_user_input(
@@ -4623,6 +4666,7 @@ async fn run_terminal(
                                 if !forward_only {
                                     render_frame(&frame)?;
                                     predictor.observe_output(&frame.bytes);
+                                    last_terminal_frame_at = Instant::now();
                                 }
                                 last_packet_at = Instant::now();
                                 flush_pending_user_input(
@@ -4648,6 +4692,7 @@ async fn run_terminal(
                             if !forward_only {
                                 render_frame(&frame)?;
                                 predictor.observe_output(&frame.bytes);
+                                last_terminal_frame_at = Instant::now();
                                 flush_startup_input_if_ready(
                                     &socket,
                                     addr,
@@ -4747,6 +4792,7 @@ async fn run_terminal(
                                 if !forward_only {
                                     render_frame(&frame)?;
                                     predictor.observe_output(&frame.bytes);
+                                    last_terminal_frame_at = Instant::now();
                                 }
                                 last_packet_at = Instant::now();
                                 flush_pending_user_input(
@@ -5142,6 +5188,7 @@ async fn run_terminal(
                         if !forward_only {
                             render_frame(&frame)?;
                             predictor.observe_output(&frame.bytes);
+                            last_terminal_frame_at = Instant::now();
                         }
                         last_packet_at = Instant::now();
                         flush_pending_user_input(
@@ -5183,6 +5230,44 @@ async fn run_terminal(
                         (&mut startup_input_hold_until, &mut startup_gate_mode),
                     )
                     .await?;
+                    let now = Instant::now();
+                    if should_repaint_idle_alternate_screen(
+                        predictor.alternate_screen,
+                        last_terminal_frame_at,
+                        last_idle_repaint_attempt_at,
+                        now,
+                    ) {
+                        last_idle_repaint_attempt_at = now;
+                        if let Some(frame) = reconnect(
+                            &socket,
+                            &mut cred,
+                            &mut send_seq,
+                            last_size,
+                            &mut frame_buffer,
+                            &mut predictor,
+                        )
+                        .await?
+                        {
+                            refresh_live_addr(&mut addr, &cred)?;
+                            arm_stale_terminal_input_suppression(
+                                &mut stale_terminal_input_suppress_until,
+                            );
+                            render_frame(&frame)?;
+                            predictor.observe_output(&frame.bytes);
+                            last_terminal_frame_at = Instant::now();
+                            last_packet_at = Instant::now();
+                            flush_pending_user_input(
+                                &socket,
+                                addr,
+                                &cred,
+                                &mut send_seq,
+                                &mut predictor,
+                                &mut pending_user_input,
+                                &mut pending_user_input_bytes,
+                            )
+                            .await?;
+                        }
+                    }
                 }
                 // Refresh / clear the non-destructive disconnect status line based
                 // on how long the link has been silent (recomputed after any
@@ -5552,6 +5637,21 @@ fn should_strip_stale_terminal_reports(
         || suppress_until.is_some_and(|deadline| Instant::now() < deadline)
 }
 
+fn input_contains_focus_in(bytes: &[u8]) -> bool {
+    contains_bytes(bytes, b"\x1b[I") || contains_bytes(bytes, b"\x9bI")
+}
+
+fn should_repaint_idle_alternate_screen(
+    alternate_screen: bool,
+    last_terminal_frame_at: Instant,
+    last_attempt_at: Instant,
+    now: Instant,
+) -> bool {
+    alternate_screen
+        && now.duration_since(last_terminal_frame_at) >= ALT_SCREEN_IDLE_REPAINT_AFTER
+        && now.duration_since(last_attempt_at) >= ALT_SCREEN_IDLE_REPAINT_AFTER
+}
+
 fn arm_stale_terminal_input_suppression(suppress_until: &mut Option<Instant>) {
     *suppress_until = Some(Instant::now() + POST_RECONNECT_STALE_INPUT_GRACE);
 }
@@ -5679,19 +5779,21 @@ fn stale_mouse_report_maybe_incomplete(bytes: &[u8], offset: usize) -> bool {
         [0x1b] | [0x1b, b'['] | [0x1b, b'[', b'<'] => true,
         [0x1b, b'[', b'M', ..] if rest.len() < 6 => true,
         [0x1b, b'[', b'<', params @ ..] | [0x1b, b'[', params @ ..]
-            if params_are_mouse_prefix(params) =>
+            if params_are_mouse_prefix(params, 2) =>
         {
             true
         }
         [0x9b] | [0x9b, b'<'] => true,
         [0x9b, b'M', ..] if rest.len() < 5 => true,
-        [0x9b, b'<', params @ ..] | [0x9b, params @ ..] if params_are_mouse_prefix(params) => true,
+        [0x9b, b'<', params @ ..] | [0x9b, params @ ..] if params_are_mouse_prefix(params, 2) => {
-        params if params_are_mouse_prefix(params) => true,
+            true
+        }
+        params if params_are_mouse_prefix(params, 2) => true,
         _ => false,
     }
 }
 
-fn params_are_mouse_prefix(params: &[u8]) -> bool {
+fn params_are_mouse_prefix(params: &[u8], min_semicolons: usize) -> bool {
     let mut semicolons = 0usize;
     let mut saw_digit = false;
     for byte in params {
@@ -5701,7 +5803,7 @@ fn params_are_mouse_prefix(params: &[u8]) -> bool {
             _ => return false,
         }
     }
-    saw_digit && semicolons >= 1
+    saw_digit && semicolons >= min_semicolons
 }
 
 async fn flush_startup_input_if_ready(
@@ -7228,11 +7330,12 @@ const TERMINAL_CLEANUP: &[u8] = concat!(
 #[cfg(test)]
 mod tests {
     use super::{
-        CachedCredential, DisconnectStatus, DynamicForward, FRAME_GAP_RESYNC_AFTER_MS, FrameBuffer,
+        ALT_SCREEN_IDLE_REPAINT_AFTER, CachedCredential, DisconnectStatus, DynamicForward,
-        LocalForward, MAX_PENDING_USER_INPUT_BYTES, POST_SUBMIT_ALL_INPUT_HOLD, PendingStreamOpen,
+        FRAME_GAP_RESYNC_AFTER_MS, FrameBuffer, LocalForward, MAX_PENDING_USER_INPUT_BYTES,
-        PredictMode, Predictor, RESTART_STATUS_SCRIPT, RemoteForward, STARTUP_INPUT_HOLD,
+        POST_SUBMIT_ALL_INPUT_HOLD, PendingStreamOpen, PredictMode, Predictor,
-        SshConfig, StartupGateMode, StatusAction, auth_allows, cache_key, cache_server_prefix,
+        RESTART_STATUS_SCRIPT, RemoteForward, STARTUP_INPUT_HOLD, SshConfig, StartupGateMode,
-        clear_cached_credentials, ensure_tui_safe_status_overlay, input_matches_escape,
+        StatusAction, auth_allows, cache_key, cache_server_prefix, clear_cached_credentials,
+        ensure_tui_safe_status_overlay, input_contains_focus_in, input_matches_escape,
         is_local_status_target, is_resume_response_for_client, latest_release_download_url,
         load_first_native_identity_with_prompt, parse_dynamic_forward, parse_escape_key,
         parse_local_forward, parse_remote_forward, parse_ssh_config, post_submit_hold_duration,
@@ -7241,10 +7344,11 @@ mod tests {
         render_status_clear, render_status_overlay, requested_env, resolved_startup_command,
         retransmit_stream_opens, rewrite_forward_command, selected_predict_mode, selected_udp_host,
         server_version_mismatch, should_flush_terminal_input_after_contact,
-        should_hold_during_startup_gate, should_hold_post_submit_input, split_after_command_submit,
+        should_hold_during_startup_gate, should_hold_post_submit_input,
-        ssh_destination_host, ssh_username, ssh_with_user, startup_command, status_ssh_target,
+        should_repaint_idle_alternate_screen, split_after_command_submit, ssh_destination_host,
-        strip_stale_mouse_reports, toml_bare_key_or_quoted, update_check_requested,
+        ssh_username, ssh_with_user, startup_command, status_ssh_target, strip_stale_mouse_reports,
-        update_version_status, upsert_managed_block, valid_forward_host, vscode_safe_alias,
+        toml_bare_key_or_quoted, update_check_requested, update_version_status,
+        upsert_managed_block, valid_forward_host, vscode_safe_alias,
     };
     use dosh::config::{ClientConfig, CommandExtension, HostConfig};
     use dosh::native::EnvVar;
@@ -7253,7 +7357,7 @@ mod tests {
     use ed25519_dalek::{SigningKey, VerifyingKey};
     use std::collections::{HashMap, VecDeque};
     use std::fs;
-    use std::time::Duration;
+    use std::time::{Duration, Instant};
 
     fn test_args(server: &str, command: &[&str]) -> super::Args {
         super::Args {
@@ -8529,12 +8633,53 @@ mod tests {
         assert_eq!(strip_stale_mouse_reports(b"10m"), b"");
     }
 
+    #[test]
+    fn numeric_semicolon_input_survives_stale_filter() {
+        assert_eq!(strip_stale_mouse_reports(b"123;"), b"123;");
+        assert_eq!(strip_stale_mouse_reports(b"12;34"), b"12;34");
+        assert_eq!(strip_stale_mouse_reports(b"echo 1;"), b"echo 1;");
+    }
+
+    #[test]
+    fn incomplete_three_field_mouse_prefix_is_suppressed() {
+        assert_eq!(strip_stale_mouse_reports(b"35;152;"), b"");
+        assert_eq!(strip_stale_mouse_reports(b"\x1b[<35;152;"), b"");
+        assert_eq!(strip_stale_mouse_reports(b"\x9b35;152;"), b"");
+    }
+
     #[test]
     fn stale_focus_reports_are_stripped_from_pending_input() {
         assert_eq!(strip_stale_mouse_reports(b"\x1b[Ihello\x1b[O"), b"hello");
         assert_eq!(strip_stale_mouse_reports(b"\x9bIhello\x9bO"), b"hello");
     }
 
+    #[test]
+    fn focus_in_reports_trigger_local_repaint_detection() {
+        assert!(input_contains_focus_in(b"\x1b[I"));
+        assert!(input_contains_focus_in(b"before\x9bIafter"));
+        assert!(!input_contains_focus_in(b"\x1b[O"));
+        assert!(!input_contains_focus_in(b"\x1b[A"));
+    }
+
+    #[test]
+    fn idle_repaint_only_runs_for_stale_alternate_screen() {
+        let now = Instant::now();
+        let stale = now - ALT_SCREEN_IDLE_REPAINT_AFTER - Duration::from_secs(1);
+        let recent = now - Duration::from_secs(1);
+        assert!(should_repaint_idle_alternate_screen(
+            true, stale, stale, now
+        ));
+        assert!(!should_repaint_idle_alternate_screen(
+            false, stale, stale, now
+        ));
+        assert!(!should_repaint_idle_alternate_screen(
+            true, recent, stale, now
+        ));
+        assert!(!should_repaint_idle_alternate_screen(
+            true, stale, recent, now
+        ));
+    }
+
     #[test]
     fn non_mouse_escape_input_survives_stale_filter() {
         assert_eq!(strip_stale_mouse_reports(b"\x1b[A"), b"\x1b[A");

src/bin/dosh-server.rs

@@ -865,6 +865,7 @@ async fn handle_packet(
         | PacketKind::StreamEof
         | PacketKind::StreamWindowAdjust
         | PacketKind::RekeyAck
+        | PacketKind::Detach
             if find_client_decrypt_key(state, &packet.header).is_err() =>
         {
             send_reject_to_client(socket, peer, packet.header.conn_id, "unknown client").await
@@ -1734,7 +1735,14 @@ async fn handle_ping(
 }
 
 async fn handle_detach(state: &Arc<Mutex<ServerState>>, packet: &protocol::Packet) -> Result<()> {
+    let (key, _) = find_client_decrypt_key(state, &packet.header)?;
+    let _ = protocol::decrypt_body(packet, &key, CLIENT_TO_SERVER)?;
     let mut locked = state.lock().expect("server state poisoned");
+    if let Some(client) = locked.client_mut(&packet.header.conn_id) {
+        if !client.replay.accept(packet.header.seq) {
+            return Ok(());
+        }
+    }
     locked.remove_client_everywhere(&packet.header.conn_id);
     Ok(())
 }
@@ -4105,6 +4113,63 @@ mod tests {
         assert!(locked.lookup_client(&client_id).is_none());
     }
 
+    #[tokio::test]
+    async fn forged_plaintext_detach_does_not_remove_client() {
+        let (pty_tx, _pty_rx) = mpsc::unbounded_channel();
+        let mut state = ServerState::new(ServerConfig::default(), [0u8; 32], pty_tx);
+        state
+            .ensure_session("work", 80, 24, "forward-only", &[])
+            .unwrap();
+        let client_id = [21u8; 16];
+        let session_key = [22u8; 32];
+        state.insert_client("work", client_id, test_client_state(session_key));
+        let state = Arc::new(Mutex::new(state));
+        let mut packet = protocol::decode(
+            &protocol::encode_plain(PacketKind::Detach, client_id, 1, 0, b"").unwrap(),
+        )
+        .unwrap();
+        packet.header.session_key_id = protocol::session_key_id(&session_key);
+
+        assert!(handle_detach(&state, &packet).await.is_err());
+
+        let locked = state.lock().unwrap();
+        assert!(
+            locked.lookup_client(&client_id).is_some(),
+            "plaintext detach with a copied key id must not remove a live client"
+        );
+    }
+
+    #[tokio::test]
+    async fn authenticated_detach_removes_client() {
+        let (pty_tx, _pty_rx) = mpsc::unbounded_channel();
+        let mut state = ServerState::new(ServerConfig::default(), [0u8; 32], pty_tx);
+        state
+            .ensure_session("work", 80, 24, "forward-only", &[])
+            .unwrap();
+        let client_id = [23u8; 16];
+        let session_key = [24u8; 32];
+        state.insert_client("work", client_id, test_client_state(session_key));
+        let state = Arc::new(Mutex::new(state));
+        let packet = protocol::decode(
+            &protocol::encode_encrypted(
+                PacketKind::Detach,
+                client_id,
+                1,
+                0,
+                &session_key,
+                CLIENT_TO_SERVER,
+                b"",
+            )
+            .unwrap(),
+        )
+        .unwrap();
+
+        handle_detach(&state, &packet).await.unwrap();
+
+        let locked = state.lock().unwrap();
+        assert!(locked.lookup_client(&client_id).is_none());
+    }
+
     #[tokio::test]
     async fn duplicate_stream_open_for_open_stream_resends_ok() {
         let (pty_tx, _pty_rx) = mpsc::unbounded_channel();

src/protocol.rs

@@ -280,7 +280,7 @@ pub fn decode(input: &[u8]) -> Result<Packet> {
 
 pub fn decrypt_body(packet: &Packet, key: &[u8; 32], direction: u32) -> Result<Vec<u8>> {
     if packet.header.flags & 1 == 0 {
-        return Ok(packet.body.clone());
+        bail!("packet body is not encrypted");
     }
     let nonce = crypto::nonce_from(direction, packet.header.seq);
     let aad = packet.header.aad();

tests/protocol_auth.rs

@@ -58,6 +58,19 @@ fn encrypted_packet_round_trips() {
     assert_eq!(plain, b"hello");
 }
 
+#[test]
+fn plaintext_packet_never_decrypts_as_authenticated_body() {
+    let key = crypto::random_32();
+    let mut decoded = protocol::decode(
+        &protocol::encode_plain(PacketKind::Input, crypto::random_16(), 1, 0, b"hello").unwrap(),
+    )
+    .unwrap();
+    decoded.header.session_key_id = protocol::session_key_id(&key);
+
+    let err = protocol::decrypt_body(&decoded, &key, CLIENT_TO_SERVER).unwrap_err();
+    assert!(err.to_string().contains("not encrypted"));
+}
+
 #[test]
 fn encrypted_packet_rejects_wrong_session_key_id_before_decrypt() {
     let key = crypto::random_32();