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apache2/apache2-CVE-2024-38473-2.patch

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From 6b8e043ce4f27114e6ae1b8176b629b7cb3fbbce Mon Sep 17 00:00:00 2001
From: Yann Ylavic <ylavic@apache.org>
Date: Wed, 26 Jun 2024 14:51:32 +0000
Subject: [PATCH] mod_proxy: Fixup UDS filename for mod_proxy called through
r->handler.
* modules/proxy/proxy_util.c:
Export ap_proxy_fixup_uds_filename() from fix_uds_filename.
Call it from ap_proxy_pre_request() even for rewritten balancer workers.
* modules/proxy/mod_proxy.h:
Declare ap_proxy_fixup_uds_filename()
* modules/proxy/mod_proxy.c:
Fixup UDS filename from r->handler in proxy_handler().
* include/ap_mmn.h:
Bump MMN minor for ap_proxy_fixup_uds_filename()
mod_proxy: follow up to r1918626: Simplify ap_proxy_fixup_uds_filename() and callers.
Merges r1918626, r1918647 from trunk
GH: closes #457
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1918666 13f79535-47bb-0310-9956-ffa450edef68
---
include/ap_mmn.h | 3 ++-
modules/proxy/mod_proxy.c | 33 ++++++++++++++++++------------
modules/proxy/mod_proxy.h | 8 ++++++++
modules/proxy/proxy_util.c | 41 ++++++++++++++++++++++----------------
4 files changed, 54 insertions(+), 31 deletions(-)
Index: httpd-2.4.58/modules/proxy/mod_proxy.c
===================================================================
--- httpd-2.4.58.orig/modules/proxy/mod_proxy.c
+++ httpd-2.4.58/modules/proxy/mod_proxy.c
@@ -1227,6 +1227,7 @@ static int proxy_fixup(request_rec *r)
return OK; /* otherwise; we've done the best we can */
}
+
/* Send a redirection if the request contains a hostname which is not */
/* fully qualified, i.e. doesn't have a domain name appended. Some proxy */
/* servers like Netscape's allow this and access hosts from the local */
@@ -1280,7 +1281,7 @@ static int proxy_handler(request_rec *r)
ap_get_module_config(sconf, &proxy_module);
apr_array_header_t *proxies = conf->proxies;
struct proxy_remote *ents = (struct proxy_remote *) proxies->elts;
- int i, rc, access_status;
+ int rc = DECLINED, access_status, i;
int direct_connect = 0;
const char *str;
apr_int64_t maxfwd;
@@ -1295,22 +1296,28 @@ static int proxy_handler(request_rec *r)
return DECLINED;
}
- if (!r->proxyreq) {
- rc = DECLINED;
- /* We may have forced the proxy handler via config or .htaccess */
- if (r->handler &&
- strncmp(r->handler, "proxy:", 6) == 0 &&
- strncmp(r->filename, "proxy:", 6) != 0) {
- r->proxyreq = PROXYREQ_REVERSE;
- r->filename = apr_pstrcat(r->pool, r->handler, r->filename, NULL);
- /* Still need to fixup/canonicalize r->filename */
+ /* We may have forced the proxy handler via config or .htaccess */
+ if (!r->proxyreq && r->handler && strncmp(r->handler, "proxy:", 6) == 0) {
+ char *old_filename = r->filename;
+
+ r->proxyreq = PROXYREQ_REVERSE;
+ r->filename = apr_pstrcat(r->pool, r->handler, r->filename, NULL);
+
+ /* Still need to fixup/canonicalize r->filename */
+ rc = ap_proxy_fixup_uds_filename(r);
+ if (rc <= OK) {
rc = proxy_fixup(r);
}
if (rc != OK) {
- return rc;
+ r->filename = old_filename;
+ r->proxyreq = 0;
}
- } else if (strncmp(r->filename, "proxy:", 6) != 0) {
- return DECLINED;
+ }
+ else if (r->proxyreq && strncmp(r->filename, "proxy:", 6) == 0) {
+ rc = OK;
+ }
+ if (rc != OK) {
+ return rc;
}
/* handle max-forwards / OPTIONS / TRACE */
Index: httpd-2.4.58/modules/proxy/mod_proxy.h
===================================================================
--- httpd-2.4.58.orig/modules/proxy/mod_proxy.h
+++ httpd-2.4.58/modules/proxy/mod_proxy.h
@@ -993,6 +993,14 @@ PROXY_DECLARE(proxy_balancer_shared *) a
proxy_balancer *balancer,
unsigned int *index);
+/*
+ * Strip the UDS part of r->filename if any, and put the UDS path in
+ * r->notes ("uds_path")
+ * @param r current request
+ * @return OK if fixed up, DECLINED if not UDS, or an HTTP_XXX error
+ */
+PROXY_DECLARE(int) ap_proxy_fixup_uds_filename(request_rec *r);
+
/**
* Get the most suitable worker and/or balancer for the request
* @param worker worker used for processing request
Index: httpd-2.4.58/modules/proxy/proxy_util.c
===================================================================
--- httpd-2.4.58.orig/modules/proxy/proxy_util.c
+++ httpd-2.4.58/modules/proxy/proxy_util.c
@@ -2316,7 +2316,7 @@ static int ap_proxy_retry_worker(const c
* were passed a UDS url (eg: from mod_proxy) and adjust uds_path
* as required.
*/
-static int fix_uds_filename(request_rec *r, char **url)
+PROXY_DECLARE(int) ap_proxy_fixup_uds_filename(request_rec *r)
{
char *uds_url = r->filename + 6, *origin_url;
@@ -2324,7 +2324,6 @@ static int fix_uds_filename(request_rec
!ap_cstr_casecmpn(uds_url, "unix:", 5) &&
(origin_url = ap_strchr(uds_url + 5, '|'))) {
char *uds_path = NULL;
- apr_size_t url_len;
apr_uri_t urisock;
apr_status_t rv;
@@ -2339,20 +2338,20 @@ static int fix_uds_filename(request_rec
if (!uds_path) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10292)
"Invalid proxy UDS filename (%s)", r->filename);
- return 0;
+ return HTTP_BAD_REQUEST;
}
apr_table_setn(r->notes, "uds_path", uds_path);
- /* Remove the UDS path from *url and r->filename */
- url_len = strlen(origin_url);
- *url = apr_pstrmemdup(r->pool, origin_url, url_len);
- memcpy(uds_url, *url, url_len + 1);
-
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
- "*: rewrite of url due to UDS(%s): %s (%s)",
- uds_path, *url, r->filename);
+ "*: fixup UDS from %s: %s (%s)",
+ r->filename, origin_url, uds_path);
+
+ /* Overwrite the UDS part in place */
+ memmove(uds_url, origin_url, strlen(origin_url) + 1);
+ return OK;
}
- return 1;
+
+ return DECLINED;
}
PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
@@ -2371,9 +2370,6 @@ PROXY_DECLARE(int) ap_proxy_pre_request(
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"%s: found worker %s for %s",
(*worker)->s->scheme, (*worker)->s->name_ex, *url);
- if (!forward && !fix_uds_filename(r, url)) {
- return HTTP_INTERNAL_SERVER_ERROR;
- }
access_status = OK;
}
else if (forward) {
@@ -2403,9 +2399,6 @@ PROXY_DECLARE(int) ap_proxy_pre_request(
* regarding the Connection header in the request.
*/
apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1");
- if (!fix_uds_filename(r, url)) {
- return HTTP_INTERNAL_SERVER_ERROR;
- }
}
}
}
@@ -2415,6 +2408,20 @@ PROXY_DECLARE(int) ap_proxy_pre_request(
"all workers are busy. Unable to serve %s", *url);
access_status = HTTP_SERVICE_UNAVAILABLE;
}
+
+ if (access_status == OK && r->proxyreq == PROXYREQ_REVERSE) {
+ int rc = ap_proxy_fixup_uds_filename(r);
+ if (ap_is_HTTP_ERROR(rc)) {
+ return rc;
+ }
+ /* If the URL has changed in r->filename, take everything after
+ * the "proxy:" prefix.
+ */
+ if (rc == OK) {
+ *url = apr_pstrdup(r->pool, r->filename + 6);
+ }
+ }
+
return access_status;
}
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