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130 lines
5.7 KiB
130 lines
5.7 KiB
From 8b6d55f6a047acf62675e32606b037f5eea8ccc7 Mon Sep 17 00:00:00 2001
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From: Eric Covener <covener@apache.org>
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Date: Tue, 10 Jan 2023 13:20:09 +0000
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Subject: [PATCH] Merge r1906539 from trunk:
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fail on bad header
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Submitted By: covener
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Reviewed By: covener, rpluem, gbechis
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1906541 13f79535-47bb-0310-9956-ffa450edef68
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---
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modules/proxy/mod_proxy_http.c | 46 ++++++++++++++++++++--------------
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server/protocol.c | 2 ++
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2 files changed, 29 insertions(+), 19 deletions(-)
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diff --git a/modules/proxy/mod_proxy_http.c b/modules/proxy/mod_proxy_http.c
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index d74ae054ac9..ec4e7fb06b5 100644
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--- a/modules/proxy/mod_proxy_http.c
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+++ b/modules/proxy/mod_proxy_http.c
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@@ -788,7 +788,7 @@ static void process_proxy_header(request_rec *r, proxy_dir_conf *c,
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* any sense at all, since we depend on buffer still containing
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* what was read by ap_getline() upon return.
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*/
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-static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
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+static apr_status_t ap_proxy_read_headers(request_rec *r, request_rec *rr,
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char *buffer, int size,
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conn_rec *c, int *pread_len)
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{
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@@ -820,19 +820,26 @@ static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
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rc = ap_proxygetline(tmp_bb, buffer, size, rr,
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AP_GETLINE_FOLD | AP_GETLINE_NOSPC_EOL, &len);
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- if (len <= 0)
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- break;
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- if (APR_STATUS_IS_ENOSPC(rc)) {
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- /* The header could not fit in the provided buffer, warn.
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- * XXX: falls through with the truncated header, 5xx instead?
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- */
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- int trunc = (len > 128 ? 128 : len) / 2;
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- ap_log_rerror(APLOG_MARK, APLOG_WARNING, rc, r, APLOGNO(10124)
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- "header size is over the limit allowed by "
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- "ResponseFieldSize (%d bytes). "
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- "Bad response header: '%.*s[...]%s'",
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- size, trunc, buffer, buffer + len - trunc);
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+ if (rc != APR_SUCCESS) {
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+ if (APR_STATUS_IS_ENOSPC(rc)) {
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+ int trunc = (len > 128 ? 128 : len) / 2;
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+ ap_log_rerror(APLOG_MARK, APLOG_WARNING, rc, r, APLOGNO(10124)
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+ "header size is over the limit allowed by "
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+ "ResponseFieldSize (%d bytes). "
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+ "Bad response header: '%.*s[...]%s'",
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+ size, trunc, buffer, buffer + len - trunc);
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+ }
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+ else {
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+ ap_log_rerror(APLOG_MARK, APLOG_WARNING, rc, r, APLOGNO(10404)
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+ "Error reading headers from backend");
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+ }
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+ r->headers_out = NULL;
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+ return rc;
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+ }
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+
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+ if (len <= 0) {
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+ break;
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r, "%s", buffer);
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@@ -855,7 +862,7 @@ static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
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if (psc->badopt == bad_error) {
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/* Nope, it wasn't even an extra HTTP header. Give up. */
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r->headers_out = NULL;
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- return;
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+ return APR_EINVAL;
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}
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else if (psc->badopt == bad_body) {
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/* if we've already started loading headers_out, then
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@@ -869,13 +876,13 @@ static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
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"in headers returned by %s (%s)",
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r->uri, r->method);
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*pread_len = len;
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- return;
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+ return APR_SUCCESS;
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01099)
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"No HTTP headers returned by %s (%s)",
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r->uri, r->method);
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- return;
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+ return APR_SUCCESS;
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}
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}
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}
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@@ -905,6 +912,7 @@ static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
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process_proxy_header(r, dconf, buffer, value);
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saw_headers = 1;
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}
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+ return APR_SUCCESS;
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}
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@@ -1218,10 +1226,10 @@ int ap_proxy_http_process_response(proxy_http_req_t *req)
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"Set-Cookie", NULL);
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/* shove the headers direct into r->headers_out */
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- ap_proxy_read_headers(r, backend->r, buffer, response_field_size,
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- origin, &pread_len);
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+ rc = ap_proxy_read_headers(r, backend->r, buffer, response_field_size,
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+ origin, &pread_len);
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- if (r->headers_out == NULL) {
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+ if (rc != APR_SUCCESS || r->headers_out == NULL) {
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ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01106)
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"bad HTTP/%d.%d header returned by %s (%s)",
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major, minor, r->uri, r->method);
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diff --git a/server/protocol.c b/server/protocol.c
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index 7adc7f75c10..6f9540ad1de 100644
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--- a/server/protocol.c
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+++ b/server/protocol.c
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@@ -508,6 +508,8 @@ AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n,
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/* PR#43039: We shouldn't accept NULL bytes within the line */
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bytes_handled = strlen(*s);
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if (bytes_handled < *read) {
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+ ap_log_data(APLOG_MARK, APLOG_DEBUG, ap_server_conf,
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+ "NULL bytes in header", *s, *read, 0);
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*read = bytes_handled;
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if (rv == APR_SUCCESS) {
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rv = APR_EINVAL;
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