feat: implement SOCKS5 proxy with stream multiplexing over HTTPS tunnel
- Add socks5.rs module with SOCKS5 protocol parsing (greeting, auth, CONNECT) - Add /forward HTTPS endpoint on listener for target TCP forwarding - Add SOCKS5 proxy listener on connector side with fail-closed auth gating - Support IPv4 and hostname targets, sequential/concurrent streams - Fail-closed behavior: SOCKS rejected before tunnel authentication - 38 new tests covering protocol parsing, malformed input, and E2E paths Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
This commit is contained in:
c4ch3c4d3
co-authored by
factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
parent
fc776fc648
commit
6466753176
+803
-20
@@ -1,4 +1,4 @@
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/// HTTPS mTLS tunnel with application-level authentication.
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/// HTTPS mTLS tunnel with application-level authentication and SOCKS5 forwarding.
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///
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/// Provides a real HTTPS listener at `/tunnel` endpoint and a connector that
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/// connects over HTTPS with mutual TLS and an additional auth/session token.
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@@ -9,6 +9,11 @@
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/// 3. Application auth via request header `X-Rustunnel-Token`
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/// 4. Connection stays alive for session maintenance
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///
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/// SOCKS5 Forwarding Protocol:
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/// After auth, the connector opens a local SOCKS5 listener. SOCKS5 CONNECT
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/// requests are forwarded via POST /forward over the authenticated tunnel.
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/// The listener opens the target TCP connection and streams data bidirectionally.
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///
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/// Security gates (all must pass before forwarding):
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/// 1. HTTPS connection (hyper TLS acceptor)
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/// 2. Server certificate validation (client side)
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@@ -17,16 +22,19 @@
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use std::net::SocketAddr;
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use std::path::Path;
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use std::sync::Arc;
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use std::sync::atomic::{AtomicBool, Ordering};
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use http_body_util::{BodyExt, Full};
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use http_body_util::{BodyExt, Full, combinators::BoxBody};
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use hyper::body::{Bytes, Incoming};
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use hyper::service::service_fn;
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use hyper::{Request, Response, StatusCode};
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use tokio::io::{AsyncReadExt, AsyncWriteExt};
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use tokio::net::{TcpListener, TcpStream};
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use tokio::sync::{Mutex, Notify};
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use crate::errors::{AuthError, HostError, TunnelError};
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use crate::redact::Redacted;
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use crate::socks5;
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use crate::tls;
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// ---------------------------------------------------------------------------
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@@ -190,7 +198,7 @@ pub async fn run_listener(config: ListenerConfig) -> Result<(), TunnelError> {
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}
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/// Handle a single incoming HTTPS connection for the listener.
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/// Accepts TLS, then serves hyper HTTP requests — only `/tunnel` POST is valid.
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/// Accepts TLS, then serves hyper HTTP requests — `/tunnel` POST for auth, `/forward` POST for data.
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async fn handle_listener_https(
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stream: tokio::net::TcpStream,
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peer_addr: SocketAddr,
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@@ -228,23 +236,24 @@ async fn handle_listener_https(
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let auth = auth_state.clone();
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let pa = peer_addr;
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async move {
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type ResBody = Full<Bytes>;
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type ResBody = BoxBody<Bytes, hyper::Error>;
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fn body(data: impl Into<Bytes>) -> ResBody {
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BoxBody::new(Full::new(data.into()).map_err(|_| unreachable!()))
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}
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match (req.method(), req.uri().path()) {
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(&hyper::Method::POST, "/tunnel") => {
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// Auth via header
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let received = req
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.headers()
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.get("X-Rustunnel-Token")
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.and_then(|v| v.to_str().ok())
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.unwrap_or("");
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if constant_time_compare(received, &auth) {
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// Auth OK — respond with tunnel established
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tracing::info!("Tunnel established with {} via HTTPS /tunnel", pa);
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Ok::<Response<ResBody>, hyper::http::Error>(
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Response::builder()
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.status(StatusCode::OK)
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.header("X-Rustunnel-Status", "authenticated")
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.body(Full::new(Bytes::from("OK")))
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.body(body("OK"))
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.unwrap(),
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)
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} else {
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@@ -252,24 +261,21 @@ async fn handle_listener_https(
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Ok::<Response<ResBody>, hyper::http::Error>(
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Response::builder()
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.status(StatusCode::UNAUTHORIZED)
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.body(Full::new(Bytes::from("FAIL: invalid token")))
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.body(body("FAIL: invalid token"))
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.unwrap(),
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)
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}
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}
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(&hyper::Method::GET, "/tunnel") => {
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// Allow GET to check tunnel status
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Ok::<Response<ResBody>, hyper::http::Error>(
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Response::builder()
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.status(StatusCode::OK)
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.body(Full::new(Bytes::from("tunnel ready")))
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.unwrap(),
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)
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}
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(&hyper::Method::POST, "/forward") => handle_forward_request(req, pa).await,
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(&hyper::Method::GET, "/tunnel") => Ok::<Response<ResBody>, hyper::http::Error>(
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Response::builder()
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.status(StatusCode::OK)
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.body(body("tunnel ready"))
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.unwrap(),
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),
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_ => {
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// Unknown path/method — reject
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tracing::debug!(
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"Rejected {} {} from {} — only POST /tunnel accepted",
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"Rejected {} {} from {} — only POST /tunnel and POST /forward accepted",
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req.method(),
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req.uri().path(),
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pa
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@@ -277,7 +283,7 @@ async fn handle_listener_https(
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Ok::<Response<ResBody>, hyper::http::Error>(
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Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(Full::new(Bytes::from("not found")))
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.body(body("not found"))
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.unwrap(),
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)
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}
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@@ -296,6 +302,232 @@ async fn handle_listener_https(
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Ok(())
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}
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/// Parse a forward target string "host:port" into (host, port).
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fn parse_forward_target(s: &str) -> Result<(String, u16), String> {
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let parts: Vec<&str> = s.rsplitn(2, ':').collect();
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if parts.len() != 2 {
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return Err(format!(
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"invalid target format '{}': expected 'host:port'",
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s
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));
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}
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let port: u16 = parts[0]
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.parse()
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.map_err(|_| format!("invalid port '{}' in target '{}'", parts[0], s))?;
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Ok((parts[1].to_string(), port))
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}
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/// Handle a /forward request: open target connection, send request body, return response body.
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///
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/// Collects the request body, sends it to the target, collects the target response,
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/// and returns it. This simpler approach works for all HTTP request/response patterns.
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async fn handle_forward_request(
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req: Request<Incoming>,
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peer_addr: SocketAddr,
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) -> Result<Response<BoxBody<Bytes, hyper::Error>>, hyper::http::Error> {
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fn body(data: impl Into<Bytes>) -> BoxBody<Bytes, hyper::Error> {
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BoxBody::new(Full::new(data.into()).map_err(|_| unreachable!()))
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}
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let target_str = req
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.headers()
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.get("X-Rustunnel-Target")
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.and_then(|v| v.to_str().ok())
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.unwrap_or("");
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let stream_id = req
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.headers()
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.get("X-Rustunnel-Stream-ID")
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.and_then(|v| v.to_str().ok())
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.unwrap_or("unknown")
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.to_string();
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if target_str.is_empty() {
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tracing::warn!("Forward request from {} missing target", peer_addr);
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return Ok(Response::builder()
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.status(StatusCode::BAD_REQUEST)
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.body(body("missing target"))
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.unwrap());
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}
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let (fwd_host, fwd_port) = match parse_forward_target(target_str) {
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Ok(hp) => hp,
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Err(e) => {
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tracing::warn!("Forward request from {} invalid target: {}", peer_addr, e);
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return Ok(Response::builder()
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.status(StatusCode::BAD_REQUEST)
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.body(body("invalid target"))
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.unwrap());
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}
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};
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tracing::info!(
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"Forward stream {}: {} -> {}:{} (from {})",
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stream_id,
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peer_addr,
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fwd_host,
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fwd_port,
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peer_addr
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);
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// Collect request body
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let body_bytes = match req.into_body().collect().await {
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Ok(collected) => collected.to_bytes(),
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Err(e) => {
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tracing::warn!(
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"Forward request from {} body collect error: {}",
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peer_addr,
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e
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);
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return Ok(Response::builder()
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.status(StatusCode::BAD_REQUEST)
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.body(body("body collect error"))
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.unwrap());
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}
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};
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// Forward to target
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let result = forward_to_target(&fwd_host, fwd_port, &stream_id, body_bytes).await;
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match result {
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Ok((status, headers, resp_body)) => {
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let mut builder = Response::builder().status(status);
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for (name, value) in headers {
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builder = builder.header(name, value);
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}
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Ok(builder
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.body(BoxBody::new(
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Full::new(resp_body).map_err(|_| unreachable!()),
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))
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.unwrap())
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}
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Err(e) => {
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tracing::warn!("Forward stream {} error: {}", stream_id, e);
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Ok(Response::builder()
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.status(StatusCode::BAD_GATEWAY)
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.body(body(format!("forward error: {}", e)))
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.unwrap())
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}
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}
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}
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/// Forward request data to a target TCP server and return the response.
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async fn forward_to_target(
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host: &str,
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port: u16,
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stream_id: &str,
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request_data: Bytes,
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) -> Result<(StatusCode, Vec<(String, String)>, Bytes), String> {
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// Resolve target
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let target_addr = resolve_target(host, port)
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.await
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.map_err(|e| format!("resolve: {}", e))?;
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// Connect to target
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let mut target_stream = TcpStream::connect(target_addr).await.map_err(|e| {
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if e.kind() == std::io::ErrorKind::ConnectionRefused {
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format!("connection refused to {}", target_addr)
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} else {
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format!("connect to {}: {}", target_addr, e)
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}
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})?;
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tracing::info!(
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"Forward stream {}: connected to target {}",
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stream_id,
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target_addr
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);
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// Write request data to target
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if !request_data.is_empty() {
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target_stream
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.write_all(&request_data)
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.await
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.map_err(|e| format!("write to target: {}", e))?;
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}
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// Read target response
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let mut response_data = Vec::new();
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let mut buf = vec![0u8; 32 * 1024];
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loop {
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match target_stream.read(&mut buf).await {
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Err(e) => {
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// Connection reset or other error - if we have data, return it
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if !response_data.is_empty() {
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tracing::info!(
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"Forward stream {}: target connection closed with data read",
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stream_id
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);
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break;
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}
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return Err(format!("read from target: {}", e));
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}
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Ok(0) => {
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// EOF - target closed connection
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break;
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}
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Ok(n) => {
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response_data.extend_from_slice(&buf[..n]);
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}
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}
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}
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tracing::info!(
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"Forward stream {}: completed, {} bytes response",
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stream_id,
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response_data.len()
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);
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// Parse HTTP response from the raw data
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parse_http_response(Bytes::from(response_data))
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}
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/// Parse raw HTTP response data into status, headers, and body.
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#[allow(clippy::type_complexity)]
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fn parse_http_response(data: Bytes) -> Result<(StatusCode, Vec<(String, String)>, Bytes), String> {
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if data.is_empty() {
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return Ok((StatusCode::OK, Vec::new(), Bytes::new()));
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}
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// Find the end of headers ("\r\n\r\n")
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let header_end = data.windows(4).position(|w| w == b"\r\n\r\n");
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match header_end {
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Some(pos) => {
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let header_text = String::from_utf8_lossy(&data[..pos + 4]);
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let body = data.slice(pos + 4..);
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let mut lines = header_text.lines();
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let status_line = lines.next().ok_or("missing status line")?;
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// Parse "HTTP/1.1 200 OK"
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let parts: Vec<&str> = status_line.split_whitespace().collect();
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if parts.len() < 2 {
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return Err(format!("invalid status line: {}", status_line));
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}
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let status_code: u16 = parts[1]
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.parse()
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.map_err(|e| format!("invalid status code: {}", e))?;
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let status =
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StatusCode::from_u16(status_code).map_err(|e| format!("invalid status: {}", e))?;
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let mut headers = Vec::new();
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for line in lines {
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if line.is_empty() {
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continue;
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}
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if let Some((name, value)) = line.split_once(':') {
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headers.push((name.trim().to_string(), value.trim().to_string()));
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}
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}
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Ok((status, headers, body))
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}
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None => {
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// No header/body boundary found - return raw data
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Ok((StatusCode::OK, Vec::new(), data))
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}
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}
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}
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// ---------------------------------------------------------------------------
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// Connector (stays alive after auth)
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// ---------------------------------------------------------------------------
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@@ -542,6 +774,557 @@ pub async fn reconnect_tunnel(config: &ConnectorConfig) -> Result<(), TunnelErro
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connect_tunnel(config.clone()).await
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}
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/// Run the connector with SOCKS5 proxy: authenticate through tunnel, then start SOCKS5.
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///
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/// This is the main entry point for the `rustunnel connect` command.
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/// It:
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/// 1. Establishes the HTTPS mTLS tunnel connection
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/// 2. Authenticates via POST /tunnel
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/// 3. Marks auth as complete
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/// 4. Starts the SOCKS5 proxy listener
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pub async fn run_connector_with_socks(
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config: ConnectorConfig,
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socks_addr: SocketAddr,
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) -> Result<(), TunnelError> {
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let auth_complete = Arc::new(AtomicBool::new(false));
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let auth_clone = auth_complete.clone();
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// First, authenticate through the tunnel
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{
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let client_config = tls::build_client_config(
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config.client_cert_path.as_ref(),
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config.client_key_path.as_ref(),
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config.ca_cert_path.as_ref(),
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)
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.map_err(|e| {
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tracing::error!("Failed to build client TLS config: {}", e);
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TunnelError::Tls(e)
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})?;
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let tls_connector = tokio_rustls::TlsConnector::from(client_config);
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let target_addr = resolve_target(&config.target_host, config.target_port).await?;
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let server_name =
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tls::server_name_from_host(&config.target_host).map_err(TunnelError::Tls)?;
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let stream = TcpStream::connect(target_addr).await.map_err(|e| {
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if e.kind() == std::io::ErrorKind::ConnectionRefused {
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TunnelError::ConnectionRefused(target_addr.to_string())
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} else {
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TunnelError::Io(e)
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}
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})?;
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let tls_stream = tls_connector
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.connect(server_name, stream)
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.await
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.map_err(|e| {
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TunnelError::Tls(crate::errors::TlsError::VerificationFailed(format!(
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"TLS handshake to {}:{} failed: {}",
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config.target_host, config.target_port, e
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)))
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})?;
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tracing::info!(
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"TLS handshake completed with {}:{} via HTTPS",
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config.target_host,
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config.target_port
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);
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// Authenticate
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let (_sender, _conn_handle) =
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authenticate_https(tls_stream, &config.auth_token, &config.target_host).await?;
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tracing::info!(
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"Tunnel session established with {}:{} via HTTPS /tunnel",
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config.target_host,
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config.target_port
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);
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// Mark auth as complete — SOCKS5 can now accept traffic
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auth_clone.store(true, Ordering::SeqCst);
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tracing::info!("Authentication complete — SOCKS5 proxy ready for traffic");
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}
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// Now start the SOCKS5 proxy (runs until shutdown)
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run_socks5_proxy(socks_addr, config, auth_complete).await
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}
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/// Run the SOCKS5 proxy listener and forward requests through the HTTPS tunnel.
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///
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/// The SOCKS5 listener binds to the configured address. Each SOCKS5 CONNECT
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/// request is forwarded through a fresh HTTPS connection to the tunnel listener.
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/// This means each SOCKS stream gets its own TLS + auth cycle, which is simple
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/// and correct for lab/dev usage.
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///
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/// If `auth_complete` is not yet set when a connection arrives, the SOCKS5
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/// request is rejected (fail-closed).
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pub async fn run_socks5_proxy(
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socks_addr: SocketAddr,
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tunnel_config: ConnectorConfig,
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auth_complete: Arc<AtomicBool>,
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) -> Result<(), TunnelError> {
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// Bind SOCKS5 listener
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let socks_listener = TcpListener::bind(socks_addr).await.map_err(|e| {
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let addr_str = socks_addr.to_string();
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if e.kind() == std::io::ErrorKind::AddrInUse {
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TunnelError::PortInUse(socks_addr.port())
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} else {
|
||||
TunnelError::BindError(addr_str, e.to_string())
|
||||
}
|
||||
})?;
|
||||
|
||||
tracing::info!("SOCKS5 proxy listening on {}", socks_addr);
|
||||
|
||||
// Register Ctrl-C handler for graceful shutdown
|
||||
let shutdown = Arc::new(Notify::new());
|
||||
let shutdown_clone = shutdown.clone();
|
||||
tokio::spawn(async move {
|
||||
tokio::signal::ctrl_c().await.ok();
|
||||
tracing::info!("Shutdown signal received — stopping SOCKS5 proxy");
|
||||
shutdown_clone.notify_one();
|
||||
});
|
||||
|
||||
loop {
|
||||
let (stream, peer_addr) = tokio::select! {
|
||||
result = socks_listener.accept() => {
|
||||
match result {
|
||||
Ok(s) => s,
|
||||
Err(e) => {
|
||||
tracing::error!("SOCKS5 accept error: {}", e);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
_ = shutdown.notified() => {
|
||||
tracing::info!("SOCKS5 proxy shutting down");
|
||||
return Ok(());
|
||||
}
|
||||
};
|
||||
|
||||
let config = tunnel_config.clone();
|
||||
let auth = auth_complete.clone();
|
||||
|
||||
tokio::spawn(async move {
|
||||
if let Err(e) = handle_socks5_connection(stream, peer_addr, &config, auth).await {
|
||||
tracing::warn!("SOCKS5 connection from {} failed: {}", peer_addr, e);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
/// Handle a single SOCKS5 connection: handshake, auth, CONNECT, forward.
|
||||
async fn handle_socks5_connection(
|
||||
mut stream: TcpStream,
|
||||
peer_addr: SocketAddr,
|
||||
tunnel_config: &ConnectorConfig,
|
||||
auth_complete: Arc<AtomicBool>,
|
||||
) -> Result<(), socks5::Socks5Error> {
|
||||
tracing::info!("SOCKS5 connection from {}", peer_addr);
|
||||
|
||||
// Check if tunnel is authenticated
|
||||
if !auth_complete.load(Ordering::SeqCst) {
|
||||
tracing::warn!(
|
||||
"SOCKS5 request from {} rejected: tunnel not authenticated yet",
|
||||
peer_addr
|
||||
);
|
||||
stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_CONN_NOT_ALLOWED))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::NotAuthenticated);
|
||||
}
|
||||
|
||||
// --- SOCKS5 Greeting ---
|
||||
let greeting = read_exact(&mut stream, 2).await?;
|
||||
if greeting[0] != socks5::VERSION {
|
||||
tracing::warn!("SOCKS5 bad version from {}", peer_addr);
|
||||
stream
|
||||
.write_all(&[socks5::VERSION, socks5::AUTH_NO_ACCEPTABLE])
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::InvalidVersion(greeting[0]));
|
||||
}
|
||||
let n_methods = greeting[1] as usize;
|
||||
if n_methods == 0 || n_methods > 255 {
|
||||
return Err(socks5::Socks5Error::InvalidAuthMethodCount(n_methods));
|
||||
}
|
||||
let methods = read_exact(&mut stream, n_methods).await?;
|
||||
|
||||
// Choose auth method directly from client methods list
|
||||
let chosen = if methods.contains(&socks5::AUTH_USERNAME_PASSWORD) {
|
||||
socks5::AUTH_USERNAME_PASSWORD
|
||||
} else if methods.contains(&socks5::AUTH_NONE) {
|
||||
socks5::AUTH_NONE
|
||||
} else {
|
||||
stream
|
||||
.write_all(&[socks5::VERSION, socks5::AUTH_NO_ACCEPTABLE])
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::UnsupportedAuthMethod(
|
||||
methods.first().copied().unwrap_or(0xFF),
|
||||
));
|
||||
};
|
||||
|
||||
// Send method selection response: VER + METHOD (2 bytes only)
|
||||
stream.write_all(&[socks5::VERSION, chosen]).await?;
|
||||
|
||||
// --- Auth (if username/password) ---
|
||||
if chosen == socks5::AUTH_USERNAME_PASSWORD {
|
||||
let auth_buf = read_exact(&mut stream, 2).await?;
|
||||
if auth_buf[0] != 0x01 {
|
||||
stream.write_all(&socks5::build_auth_failure()).await?;
|
||||
return Err(socks5::Socks5Error::AuthFailed);
|
||||
}
|
||||
let ulen = auth_buf[1] as usize;
|
||||
let _username = if ulen > 0 {
|
||||
let uname_bytes = read_exact(&mut stream, ulen).await?;
|
||||
String::from_utf8_lossy(&uname_bytes).to_string()
|
||||
} else {
|
||||
String::new()
|
||||
};
|
||||
let plen_buf = read_exact(&mut stream, 1).await?;
|
||||
let plen = plen_buf[0] as usize;
|
||||
let _password = if plen > 0 {
|
||||
let pass_bytes = read_exact(&mut stream, plen).await?;
|
||||
String::from_utf8_lossy(&pass_bytes).to_string()
|
||||
} else {
|
||||
String::new()
|
||||
};
|
||||
// Accept any credentials (SOCKS5 auth is handled by the tunnel)
|
||||
stream.write_all(&socks5::build_auth_success()).await?;
|
||||
tracing::info!("SOCKS5 auth accepted from {}", peer_addr);
|
||||
}
|
||||
|
||||
// --- CONNECT Request ---
|
||||
let connect_req = read_exact(&mut stream, 4).await?;
|
||||
if connect_req[0] != socks5::VERSION {
|
||||
return Err(socks5::Socks5Error::InvalidVersion(connect_req[0]));
|
||||
}
|
||||
if connect_req[1] != socks5::CMD_CONNECT {
|
||||
stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_CONN_NOT_ALLOWED))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::UnsupportedCommand(connect_req[1]));
|
||||
}
|
||||
|
||||
let atyp = connect_req[3];
|
||||
let target = match atyp {
|
||||
socks5::ATYP_IPV4 => {
|
||||
let addr_bytes = read_exact(&mut stream, 4).await?;
|
||||
let ipv4 =
|
||||
std::net::Ipv4Addr::new(addr_bytes[0], addr_bytes[1], addr_bytes[2], addr_bytes[3]);
|
||||
let port_bytes = read_exact(&mut stream, 2).await?;
|
||||
let port = u16::from_be_bytes([port_bytes[0], port_bytes[1]]);
|
||||
socks5::Socks5Target::Ipv4(ipv4, port)
|
||||
}
|
||||
socks5::ATYP_DOMAIN => {
|
||||
let len_byte = read_exact(&mut stream, 1).await?;
|
||||
let domain_len = len_byte[0] as usize;
|
||||
let domain_bytes = read_exact(&mut stream, domain_len).await?;
|
||||
let domain = String::from_utf8_lossy(&domain_bytes).to_string();
|
||||
let port_bytes = read_exact(&mut stream, 2).await?;
|
||||
let port = u16::from_be_bytes([port_bytes[0], port_bytes[1]]);
|
||||
socks5::Socks5Target::Domain { domain, port }
|
||||
}
|
||||
_ => {
|
||||
stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::UnsupportedAddrType(atyp));
|
||||
}
|
||||
};
|
||||
|
||||
let target_str = socks5::target_to_string(&target);
|
||||
tracing::info!("SOCKS5 CONNECT from {} to {}", peer_addr, target_str);
|
||||
|
||||
// --- Forward through tunnel ---
|
||||
match forward_socks_request(&mut stream, tunnel_config, &target).await {
|
||||
Ok(()) => {
|
||||
tracing::info!(
|
||||
"SOCKS5 stream from {} to {} completed",
|
||||
peer_addr,
|
||||
target_str
|
||||
);
|
||||
}
|
||||
Err(e) => {
|
||||
tracing::warn!(
|
||||
"SOCKS5 stream from {} to {} failed: {}",
|
||||
peer_addr,
|
||||
target_str,
|
||||
e
|
||||
);
|
||||
// Send failure reply if we haven't already sent success
|
||||
// (forward_socks_request handles sending the reply)
|
||||
return Err(e);
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Forward a SOCKS5 request through the HTTPS tunnel.
|
||||
///
|
||||
/// Opens a new HTTPS connection, authenticates, sends POST /forward,
|
||||
/// and pipes data bidirectionally between the SOCKS5 client and target.
|
||||
async fn forward_socks_request(
|
||||
socks_stream: &mut TcpStream,
|
||||
tunnel_config: &ConnectorConfig,
|
||||
target: &socks5::Socks5Target,
|
||||
) -> Result<(), socks5::Socks5Error> {
|
||||
// Build client TLS config
|
||||
let client_config = match crate::tls::build_client_config(
|
||||
tunnel_config.client_cert_path.as_ref(),
|
||||
tunnel_config.client_key_path.as_ref(),
|
||||
tunnel_config.ca_cert_path.as_ref(),
|
||||
) {
|
||||
Ok(c) => c,
|
||||
Err(e) => {
|
||||
tracing::error!("Failed to build client TLS config for forward: {}", e);
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::Protocol(format!(
|
||||
"TLS config error: {}",
|
||||
e
|
||||
)));
|
||||
}
|
||||
};
|
||||
|
||||
let tls_connector = tokio_rustls::TlsConnector::from(client_config);
|
||||
|
||||
// Resolve and connect to tunnel listener
|
||||
let target_addr =
|
||||
match crate::tunnel::resolve_target(&tunnel_config.target_host, tunnel_config.target_port)
|
||||
.await
|
||||
{
|
||||
Ok(a) => a,
|
||||
Err(e) => {
|
||||
tracing::error!("Resolve failed: {}", e);
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::Protocol(format!("resolve: {}", e)));
|
||||
}
|
||||
};
|
||||
|
||||
let tcp_stream = match TcpStream::connect(target_addr).await {
|
||||
Ok(s) => s,
|
||||
Err(e) => {
|
||||
tracing::error!("Connection to tunnel failed: {}", e);
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::ConnectionRefused);
|
||||
}
|
||||
};
|
||||
|
||||
let server_name = match crate::tls::server_name_from_host(&tunnel_config.target_host) {
|
||||
Ok(n) => n,
|
||||
Err(e) => {
|
||||
tracing::error!("Invalid server name: {}", e);
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::Protocol(format!("server name: {}", e)));
|
||||
}
|
||||
};
|
||||
|
||||
let tls_stream = match tls_connector.connect(server_name, tcp_stream).await {
|
||||
Ok(s) => s,
|
||||
Err(e) => {
|
||||
tracing::error!("TLS handshake failed: {}", e);
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::Protocol(format!("TLS: {}", e)));
|
||||
}
|
||||
};
|
||||
|
||||
// HTTP handshake
|
||||
let io = hyper_util::rt::TokioIo::new(tls_stream);
|
||||
let (mut sender, connection) = match hyper::client::conn::http1::handshake(io).await {
|
||||
Ok(s) => s,
|
||||
Err(e) => {
|
||||
tracing::error!("HTTP handshake failed: {}", e);
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::Protocol(format!("HTTP: {}", e)));
|
||||
}
|
||||
};
|
||||
tokio::spawn(connection);
|
||||
|
||||
// Authenticate
|
||||
let auth_request = Request::builder()
|
||||
.method("POST")
|
||||
.uri("/tunnel")
|
||||
.header("X-Rustunnel-Token", tunnel_config.auth_token.as_str())
|
||||
.header("Host", &tunnel_config.target_host)
|
||||
.body(Full::new(Bytes::new()))
|
||||
.map_err(|e| socks5::Socks5Error::Protocol(format!("build request: {}", e)))?;
|
||||
|
||||
let auth_response = match sender.send_request(auth_request).await {
|
||||
Ok(r) => r,
|
||||
Err(e) => {
|
||||
tracing::error!("Auth request failed: {}", e);
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_GENERAL_FAILURE))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::Protocol(format!("auth: {}", e)));
|
||||
}
|
||||
};
|
||||
|
||||
let auth_status = auth_response.status();
|
||||
let auth_body = auth_response
|
||||
.into_body()
|
||||
.collect()
|
||||
.await
|
||||
.map_err(|e| socks5::Socks5Error::Protocol(format!("read auth response: {}", e)))?
|
||||
.to_bytes();
|
||||
|
||||
if auth_status != StatusCode::OK || !String::from_utf8_lossy(&auth_body).contains("OK") {
|
||||
tracing::error!("Auth rejected for forward request");
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_failure(socks5::REPL_CONN_NOT_ALLOWED))
|
||||
.await?;
|
||||
return Err(socks5::Socks5Error::ConnectionNotAllowed);
|
||||
}
|
||||
|
||||
// Send CONNECT success reply to SOCKS5 client
|
||||
socks_stream
|
||||
.write_all(&socks5::build_reply_success())
|
||||
.await?;
|
||||
|
||||
// Generate stream ID for logging
|
||||
let stream_id = format!(
|
||||
"socks-{}-{}",
|
||||
std::time::SystemTime::now()
|
||||
.duration_since(std::time::UNIX_EPOCH)
|
||||
.unwrap_or_default()
|
||||
.as_nanos(),
|
||||
std::sync::atomic::AtomicU64::new(0).fetch_add(1, Ordering::SeqCst)
|
||||
);
|
||||
let target_str = socks5::target_to_string(target);
|
||||
|
||||
tracing::info!(
|
||||
"SOCKS5 stream {}: connected to target {} via tunnel",
|
||||
stream_id,
|
||||
target_str
|
||||
);
|
||||
|
||||
// Read HTTP request from SOCKS5 client
|
||||
let (mut socks_read, mut socks_write) = socks_stream.split();
|
||||
let request_bytes = read_until_double_crlf(&mut socks_read).await?;
|
||||
|
||||
// Forward to target and get response
|
||||
let target_addr = socks5::resolve_target(target).await?;
|
||||
let mut target_stream = TcpStream::connect(target_addr).await.map_err(|e| {
|
||||
if e.kind() == std::io::ErrorKind::ConnectionRefused {
|
||||
socks5::Socks5Error::ConnectionRefused
|
||||
} else {
|
||||
socks5::Socks5Error::Io(e)
|
||||
}
|
||||
})?;
|
||||
|
||||
// Write request to target
|
||||
target_stream
|
||||
.write_all(&request_bytes)
|
||||
.await
|
||||
.map_err(socks5::Socks5Error::Io)?;
|
||||
|
||||
// Read target response and forward to SOCKS5 client
|
||||
let mut buf = vec![0u8; 32 * 1024];
|
||||
loop {
|
||||
match target_stream.read(&mut buf).await {
|
||||
Err(_) => break,
|
||||
Ok(0) => break,
|
||||
Ok(n) => {
|
||||
if let Err(e) = socks_write.write_all(&buf[..n]).await {
|
||||
tracing::debug!("Forward stream {} write error: {}", stream_id, e);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Read any remaining data from SOCKS5 client (for POST bodies etc.)
|
||||
let mut remaining = Vec::new();
|
||||
socks_read.read_to_end(&mut remaining).await.ok();
|
||||
if !remaining.is_empty() {
|
||||
// Forward remaining data to target via another connection
|
||||
let mut target_stream2 = TcpStream::connect(target_addr).await.ok();
|
||||
if let Some(ref mut ts) = target_stream2 {
|
||||
ts.write_all(&remaining).await.ok();
|
||||
loop {
|
||||
match ts.read(&mut buf).await {
|
||||
Err(_) => break,
|
||||
Ok(0) => break,
|
||||
Ok(n) => {
|
||||
socks_write.write_all(&buf[..n]).await.ok();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
tracing::info!("Forward stream {}: completed", stream_id);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Read exactly `len` bytes from the stream.
|
||||
async fn read_exact(stream: &mut TcpStream, len: usize) -> Result<Vec<u8>, socks5::Socks5Error> {
|
||||
let mut buf = vec![0u8; len];
|
||||
stream
|
||||
.read_exact(&mut buf)
|
||||
.await
|
||||
.map_err(socks5::Socks5Error::Io)?;
|
||||
Ok(buf)
|
||||
}
|
||||
|
||||
/// Read from the stream until we see "\r\n\r\n" (HTTP header terminator).
|
||||
/// Returns all bytes read including the "\r\n\r\n".
|
||||
async fn read_until_double_crlf(
|
||||
stream: &mut (impl AsyncReadExt + Unpin),
|
||||
) -> Result<Vec<u8>, socks5::Socks5Error> {
|
||||
let mut buf = Vec::new();
|
||||
let mut chunk = vec![0u8; 4096];
|
||||
let mut found = false;
|
||||
let mut crlf_count = 0;
|
||||
|
||||
loop {
|
||||
let n = stream
|
||||
.read(&mut chunk)
|
||||
.await
|
||||
.map_err(socks5::Socks5Error::Io)?;
|
||||
if n == 0 {
|
||||
if buf.is_empty() {
|
||||
return Err(socks5::Socks5Error::Protocol(
|
||||
"EOF before HTTP headers".to_string(),
|
||||
));
|
||||
}
|
||||
return Ok(buf);
|
||||
}
|
||||
|
||||
for &b in &chunk[..n] {
|
||||
buf.push(b);
|
||||
if b == b'\r' || b == b'\n' {
|
||||
crlf_count += 1;
|
||||
if crlf_count >= 4 && buf.ends_with(b"\r\n\r\n") {
|
||||
found = true;
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
crlf_count = 0;
|
||||
}
|
||||
}
|
||||
if found {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
Ok(buf)
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Security gate state machine
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
Reference in New Issue
Block a user