HTTP/3: http3_max_field_size directive to limit string size.

Client streams may send literal strings which are now limited in size by the
new directive.  The default value is 4096.

The directive is similar to HTTP/2 directive http2_max_field_size.

3 files changed, 25 insertions, 1 deletions

diff --git a/src/http/v3/ngx_http_v3.h b/src/http/v3/ngx_http_v3.h
index 3c5bb721c..d48f13922 100644
--- a/src/http/v3/ngx_http_v3.h
+++ b/src/http/v3/ngx_http_v3.h
@@ -47,9 +47,12 @@
 #define NGX_HTTP_V3_STREAM_SERVER_DECODER          5
 #define NGX_HTTP_V3_MAX_KNOWN_STREAM               6
 
+#define NGX_HTTP_V3_DEFAULT_MAX_FIELD_SIZE         4096
+
 
 typedef struct {
     ngx_quic_tp_t           quic;
+    size_t                  max_field_size;
 } ngx_http_v3_srv_conf_t;
 
 
diff --git a/src/http/v3/ngx_http_v3_module.c b/src/http/v3/ngx_http_v3_module.c
index 550b706da..17029934e 100644
--- a/src/http/v3/ngx_http_v3_module.c
+++ b/src/http/v3/ngx_http_v3_module.c
@@ -118,6 +118,13 @@ static ngx_command_t  ngx_http_v3_commands[] = {
       offsetof(ngx_http_v3_srv_conf_t, quic.retry),
       NULL },
 
+    { ngx_string("http3_max_field_size"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, max_field_size),
+      NULL },
+
       ngx_null_command
 };
 
@@ -268,6 +275,8 @@ ngx_http_v3_create_srv_conf(ngx_conf_t *cf)
 
     v3cf->quic.retry = NGX_CONF_UNSET;
 
+    v3cf->max_field_size = NGX_CONF_UNSET_SIZE;
+
     return v3cf;
 }
 
@@ -329,6 +338,9 @@ ngx_http_v3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
         }
     }
 
+    ngx_conf_merge_size_value(conf->max_field_size,
+                              prev->max_field_size,
+                              NGX_HTTP_V3_DEFAULT_MAX_FIELD_SIZE);
 
     return NGX_CONF_OK;
 }
diff --git a/src/http/v3/ngx_http_v3_parse.c b/src/http/v3/ngx_http_v3_parse.c
index 3be3802ed..71a643d70 100644
--- a/src/http/v3/ngx_http_v3_parse.c
+++ b/src/http/v3/ngx_http_v3_parse.c
@@ -399,7 +399,8 @@ ngx_int_t
 ngx_http_v3_parse_literal(ngx_connection_t *c, ngx_http_v3_parse_literal_t *st,
     u_char ch)
 {
-    ngx_uint_t  n;
+    ngx_uint_t               n;
+    ngx_http_v3_srv_conf_t  *v3cf;
     enum {
         sw_start = 0,
         sw_value
@@ -415,6 +416,14 @@ ngx_http_v3_parse_literal(ngx_connection_t *c, ngx_http_v3_parse_literal_t *st,
 
         n = st->length;
 
+        v3cf = ngx_http_v3_get_module_srv_conf(c, ngx_http_v3_module);
+
+        if (n > v3cf->max_field_size) {
+            ngx_log_error(NGX_LOG_ERR, c->log, 0,
+                          "client exceeded http3_max_field_size limit");
+            return NGX_ERROR;
+        }
+
         if (st->huffman) {
             n = n * 8 / 5;
             st->huffstate = 0;