49 lines
2.1 KiB
Markdown
49 lines
2.1 KiB
Markdown
---
|
|
id: server/channel-proxy
|
|
name: Implement server channel proxy — direct TCP and outbound proxy connections
|
|
status: pending
|
|
depends_on:
|
|
- server/handler
|
|
- auth/error-types
|
|
scope: moderate
|
|
risk: medium
|
|
impact: component
|
|
level: implementation
|
|
---
|
|
|
|
## Description
|
|
|
|
Implement the server's channel proxy logic that makes outbound TCP connections on behalf of SSH clients. When `channel_open_direct_tcpip(host, port)` is called for a non-reserved destination:
|
|
|
|
1. Connect to `host:port`, either directly or via the configured outbound proxy
|
|
2. Run `tokio::io::copy_bidirectional` between the SSH channel stream and the outbound TCP stream
|
|
3. Clean up when either side disconnects
|
|
|
|
Supports three outbound proxy modes per server.md: Direct, SOCKS5 proxy, HTTP CONNECT proxy.
|
|
|
|
## Acceptance Criteria
|
|
|
|
- [ ] `crates/wraith-core/src/server/channel_proxy.rs` exports channel proxy functions
|
|
- [ ] `ProxyConfig` enum: `Direct`, `Socks5 { addr: SocketAddr }`, `HttpConnect { addr: SocketAddr }`
|
|
- [ ] `connect_outbound(target: SocketAddr, proxy: &ProxyConfig) -> Result<TcpStream>` — connects to target directly or via proxy
|
|
- [ ] Direct mode: `TcpStream::connect(target)`
|
|
- [ ] SOCKS5 proxy: establishes SOCKS5 handshake, sends CONNECT command for target
|
|
- [ ] HTTP CONNECT proxy: sends `CONNECT host:port HTTP/1.1` to proxy, reads 200 response
|
|
- [ ] `proxy_channel(channel: ChannelStream, target: SocketAddr, proxy: &ProxyConfig)` — spawns bidirectional copy task
|
|
- [ ] Channel errors (target unreachable, proxy failure) close that channel without affecting SSH session
|
|
- [ ] No logging of tunnel destinations (ADR-006) — only transport/auth events are logged
|
|
- [ ] Unit tests: direct connection proxy, SOCKS5 proxy handshake, HTTP CONNECT proxy handshake, target unreachable handling
|
|
|
|
## References
|
|
|
|
- docs/architecture/server.md — Channel Handling, Outbound Proxy Modes sections
|
|
- docs/architecture/decisions/006-no-logging-of-tunnel-destinations.md — no destination logging
|
|
- docs/architecture/decisions/019-proxy-dual-semantics.md — server `--proxy` meaning
|
|
|
|
## Notes
|
|
|
|
> To be filled by implementation agent
|
|
|
|
## Summary
|
|
|
|
> To be filled on completion |