source: branches/fc20-dev/server/common/patches/httpd-allow-null-user.patch

From a60a2c6a87331510847de401323bcdf3b9895838 Mon Sep 17 00:00:00 2001
From: Adam Glasgall <glasgall@mit.edu>
Date: Tue, 26 Aug 2014 17:47:45 -0400
Subject: [PATCH] Remove r->user != NULL check from ap_process_request_internal

After the check_user_id hook runs, Apache checks to make sure it's
identified a user and aborts if this is not the case, to protect the
auth_checker hook from accidental null pointer
dereferences. Unfortunately, Scripts's mod_auth_optional relies on
being able to have r->user still be NULL after check_user_id has run.

This patch removes the null check. I believe this is safe because
mod_auth_optional installs its auth_checker hook forcibly at the head
of the hook chain, and said hook ends authz processing immediately if
the directory in question has AuthOptional and no default user.

Signed-off-by: Adam Glasgall <glasgall@mit.edu>
---
 server/request.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/server/request.c b/server/request.c
index af0a697..9d7e29d 100644
--- a/server/request.c
+++ b/server/request.c
@@ -244,16 +244,6 @@ AP_DECLARE(int) ap_process_request_internal(request_rec *r)
                 if ((access_status = ap_run_check_user_id(r)) != OK) {
                     return decl_die(access_status, "check user", r);
                 }
-                if (r->user == NULL) {
-                    /* don't let buggy authn module crash us in authz */
-                    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00027)
-                                  "No authentication done but request not "
-                                  "allowed without authentication for %s. "
-                                  "Authentication not configured?",
-                                  r->uri);
-                    access_status = HTTP_INTERNAL_SERVER_ERROR;
-                    return decl_die(access_status, "check user", r);
-                }
                 if ((access_status = ap_run_auth_checker(r)) != OK) {
                     return decl_die(access_status, "check authorization", r);
                 }
@@ -281,16 +271,6 @@ AP_DECLARE(int) ap_process_request_internal(request_rec *r)
                 if ((access_status = ap_run_check_user_id(r)) != OK) {
                     return decl_die(access_status, "check user", r);
                 }
-                if (r->user == NULL) {
-                    /* don't let buggy authn module crash us in authz */
-                    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00028)
-                                  "No authentication done but request not "
-                                  "allowed without authentication for %s. "
-                                  "Authentication not configured?",
-                                  r->uri);
-                    access_status = HTTP_INTERNAL_SERVER_ERROR;
-                    return decl_die(access_status, "check user", r);
-                }
                 if ((access_status = ap_run_auth_checker(r)) != OK) {
                     return decl_die(access_status, "check authorization", r);
                 }
-- 
1.9.1