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rpc: authenticate on the header block before buffering the request body — the httpd read up to MAX_REQUEST (256 KiB) and only then checked the Authorization header, so an unauthenticated peer reaching rpc_bind could make each connection consume memory + a worker thread; now POST+auth are validated as soon as headers are complete, before any body is read

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This commit is contained in:
Jean Chevronnet 2026-08-19 01:05:29 +00:00
parent 5b33786a46
commit a218d65371
1 changed files with 22 additions and 23 deletions
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45
src/modules/rpc/httpd.rs
View file

@ -79,6 +79,27 @@ fn handle(
if let Some(pos) = find_headers_end(&buf) {
head_end = Some(pos);
framing = framing_of(&buf[..pos]);
// Authenticate on the header block alone, before buffering any body,
// so an unauthenticated peer can't stream up to MAX_REQUEST at us.
let header_text = String::from_utf8_lossy(&buf[..pos]).into_owned();
let first = header_text.lines().next().unwrap_or("");
if !first
.split_whitespace()
.next()
.is_some_and(|m| m.eq_ignore_ascii_case("POST"))
{
return respond(&mut stream, 405, "Method Not Allowed", "{}");
}
let authz = header_line(&header_text, "authorization");
if !auth_ok(authz.as_deref(), user, token) {
return respond_with(
&mut stream,
401,
"Unauthorized",
"{\"error\":\"authentication required\"}",
Some("WWW-Authenticate: Basic realm=\"echoircd-rpc\""),
);
}
}
}
if let Some(he) = head_end {
@ -104,7 +125,7 @@ fn handle(
let Some(he) = head_end else {
return respond(&mut stream, 400, "Bad Request", "{}");
};
let header_text = String::from_utf8_lossy(&buf[..he]).into_owned();
// method + auth were already validated on the header block above; extract body
let raw_body = &buf[(he + 4).min(buf.len())..];
let body = match framing {
Framing::Length(n) => {
@ -113,28 +134,6 @@ fn handle(
Framing::Chunked => crate::http::dechunk(&String::from_utf8_lossy(raw_body)),
};
// request line: only POST is accepted
let first = header_text.lines().next().unwrap_or("");
if !first
.split_whitespace()
.next()
.is_some_and(|m| m.eq_ignore_ascii_case("POST"))
{
return respond(&mut stream, 405, "Method Not Allowed", "{}");
}
// authenticate
let authz = header_line(&header_text, "authorization");
if !auth_ok(authz.as_deref(), user, token) {
return respond_with(
&mut stream,
401,
"Unauthorized",
"{\"error\":\"authentication required\"}",
Some("WWW-Authenticate: Basic realm=\"echoircd-rpc\""),
);
}
// parse the JSON-RPC request
let method = super::json::get_str(&body, "method");
let id = super::json::get_raw(&body, "id").unwrap_or_else(|| "null".to_string());