Backports: r892678

Submitted by: niq
Reject requests containing (invalid) NULL characters in request line
or request headers.
PR 43039


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x-merge-http-strict@1775691 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 21 insertions, 5 deletions

diff --git a/CHANGES b/CHANGES
index bd8b050ffe..400717da69 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,7 +1,8 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.2.32
 
-
+  *) Core: reject NULLs in request line or request headers.
+     PR 43039 [Nick Kew]
 
 Changes with Apache 2.2.31
 
diff --git a/server/protocol.c b/server/protocol.c
index f078b2f2e4..84d60983a5 100644
--- a/server/protocol.c
+++ b/server/protocol.c
@@ -433,8 +433,13 @@ AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n,
             }
         }
     }
-
     *read = bytes_handled;
+
+    /* PR#43039: We shouldn't accept NULL bytes within the line */
+    if (strlen(*s) < bytes_handled - 1) {
+        return APR_EINVAL;
+    }
+
     return APR_SUCCESS;
 }
 
@@ -609,6 +614,9 @@ static int read_request_line(request_rec *r, apr_bucket_brigade *bb)
             else if (APR_STATUS_IS_TIMEUP(rv)) {
                 r->status = HTTP_REQUEST_TIME_OUT;
             }
+            else if (rv == APR_EINVAL) {
+                r->status = HTTP_BAD_REQUEST;
+            }
             r->proto_num = HTTP_VERSION(1,0);
             r->protocol  = apr_pstrdup(r->pool, "HTTP/1.0");
             return 0;
@@ -923,9 +931,16 @@ request_rec *ap_read_request(conn_rec *conn)
 
     /* Get the request... */
     if (!read_request_line(r, tmp_bb)) {
-        if (r->status == HTTP_REQUEST_URI_TOO_LARGE) {
-            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
-                          "request failed: URI too long (longer than %d)", r->server->limit_req_line);
+        if (r->status == HTTP_REQUEST_URI_TOO_LARGE
+            || r->status == HTTP_BAD_REQUEST) {
+            if (r->status == HTTP_BAD_REQUEST) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+                              "request failed: invalid characters in URI");
+            }
+            else {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+                              "request failed: URI too long (longer than %d)", r->server->limit_req_line);
+            }
             ap_send_error_response(r, 0);
             ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r);
             ap_run_log_transaction(r);