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feat: disguise UoT handshake as WebSocket to bypass DPI and proxies

This commit is contained in:
ospab 2026-05-21 14:11:50 +03:00
parent 975a0dc0d9
commit 834c244f94
2 changed files with 10 additions and 7 deletions
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13
ostp-client/src/transport/xhttp.rs
View File

@ -90,8 +90,11 @@ pub async fn connect_xhttp(
let req = format!(
"GET /stream HTTP/1.1\r\n\
Host: {}\r\n\
Upgrade: websocket\r\n\
Connection: upgrade\r\n\
Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n\
Sec-WebSocket-Version: 13\r\n\
Authorization: Bearer {}\r\n\
Connection: keep-alive\r\n\
\r\n",
http_host, auth_token
);
@ -124,8 +127,8 @@ pub async fn connect_xhttp(
if buf[..header_len].windows(4).any(|w| w == b"\r\n\r\n") { break; }
}
let resp = String::from_utf8_lossy(&buf[..header_len]);
if !resp.starts_with("HTTP/1.1 200 OK") {
anyhow::bail!("xHTTP handshake failed: expected 200 OK, got: {}", resp.lines().next().unwrap_or(""));
if !resp.starts_with("HTTP/1.1 101 ") && !resp.starts_with("HTTP/1.1 200 ") {
anyhow::bail!("xHTTP handshake failed: expected 101 or 200, got: {}", resp.lines().next().unwrap_or(""));
}
if !resp.to_ascii_lowercase().contains("x-ostp-server:") {
anyhow::bail!("xHTTP handshake failed: endpoint is not an OSTP server (missing X-Ostp-Server header)");
@ -152,8 +155,8 @@ pub async fn connect_xhttp(
if buf[..header_len].windows(4).any(|w| w == b"\r\n\r\n") { break; }
}
let resp = String::from_utf8_lossy(&buf[..header_len]);
if !resp.starts_with("HTTP/1.1 200 OK") {
anyhow::bail!("xHTTP handshake failed: expected 200 OK, got: {}", resp.lines().next().unwrap_or(""));
if !resp.starts_with("HTTP/1.1 101 ") && !resp.starts_with("HTTP/1.1 200 ") {
anyhow::bail!("xHTTP handshake failed: expected 101 or 200, got: {}", resp.lines().next().unwrap_or(""));
}
if !resp.to_ascii_lowercase().contains("x-ostp-server:") {
anyhow::bail!("xHTTP handshake failed: endpoint is not an OSTP server (missing X-Ostp-Server header)");

4
ostp-server/src/transport/uot.rs
View File

@ -107,8 +107,8 @@ pub async fn handle_tcp_connection(
anyhow::bail!("unauthorized (invalid HMAC)");
}
// Reply 200 OK
let response = "HTTP/1.1 200 OK\r\nX-Ostp-Server: 1\r\nConnection: keep-alive\r\n\r\n";
// Reply 101 Switching Protocols
let response = "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\nX-Ostp-Server: 1\r\n\r\n";
stream.write_all(response.as_bytes()).await?;
info!("UoT client authenticated from {}", peer_addr);