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diff src/http/v3/ngx_http_v3_request.c @ 9275:199dc0d6b05b

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Added max_headers directive. The directive limits the number of request headers accepted from clients. While the total amount of headers is believed to be sufficiently limited by the existing buffer size limits (client_header_buffer_size and large_client_header_buffers), the additional limit on the number of headers might be beneficial to better protect backend servers. Requested by Maksim Yevmenkin.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 24 May 2024 00:20:01 +0300
parents 388a801e9bb9
children d9fe808c1841
line wrap: on
line diff
--- a/src/http/v3/ngx_http_v3_request.c	Wed May 15 10:06:00 2024 +0300
+++ b/src/http/v3/ngx_http_v3_request.c	Fri May 24 00:20:01 2024 +0300
@@ -657,6 +657,15 @@
         }
 
     } else {
+        cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
+
+        if (r->headers_in.count++ >= cscf->max_headers) {
+            ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
+                          "client sent too many header lines");
+            ngx_http_finalize_request(r, NGX_HTTP_REQUEST_HEADER_TOO_LARGE);
+            return NGX_ERROR;
+        }
+
         h = ngx_list_push(&r->headers_in.headers);
         if (h == NULL) {
             ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);