diff --git a/SOURCES/0007-Upstream-detect-premature-plain-text-response-from-S.patch b/SOURCES/0007-Upstream-detect-premature-plain-text-response-from-S.patch new file mode 100644 index 0000000..af845cf --- /dev/null +++ b/SOURCES/0007-Upstream-detect-premature-plain-text-response-from-S.patch @@ -0,0 +1,45 @@ +From bad28aaf4bc2e882b2d006387d79c354579a2a9a Mon Sep 17 00:00:00 2001 +From: Roman Arutyunyan +Date: Thu, 29 Jan 2026 13:27:32 +0400 +Subject: [PATCH] Upstream: detect premature plain text response from SSL + backend. + +When connecting to a backend, the connection write event is triggered +first in most cases. However if a response arrives quickly enough, both +read and write events can be triggered together within the same event loop +iteration. In this case the read event handler is called first and the +write event handler is called after it. + +SSL initialization for backend connections happens only in the write event +handler since SSL handshake starts with sending Client Hello. Previously, +if a backend sent a quick plain text response, it could be parsed by the +read event handler prior to starting SSL handshake on the connection. +The change adds protection against parsing such responses on SSL-enabled +connections. +--- + src/http/ngx_http_upstream.c | 9 +++++++++ + 1 file changed, 9 insertions(+) + +diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c +index 3ae822b..6c310d8 100644 +--- a/src/http/ngx_http_upstream.c ++++ b/src/http/ngx_http_upstream.c +@@ -2441,6 +2441,15 @@ ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u) + return; + } + ++#if (NGX_HTTP_SSL) ++ if (u->ssl && c->ssl == NULL) { ++ ngx_log_error(NGX_LOG_ERR, c->log, 0, ++ "upstream prematurely sent response"); ++ ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); ++ return; ++ } ++#endif ++ + u->state->bytes_received += n; + + u->buffer.last += n; +-- +2.44.0 + diff --git a/SOURCES/404.html b/SOURCES/404.html index de97ec6..c6014a7 100644 --- a/SOURCES/404.html +++ b/SOURCES/404.html @@ -7,7 +7,7 @@