Implement max settings option

doc/CMakeLists.txt

@@ -42,6 +42,7 @@ set(APIDOCS
   nghttp2_option_set_no_recv_client_magic.rst
   nghttp2_option_set_peer_max_concurrent_streams.rst
   nghttp2_option_set_user_recv_extension_type.rst
+  nghttp2_option_set_max_settings.rst
   nghttp2_pack_settings_payload.rst
   nghttp2_priority_spec_check_default.rst
   nghttp2_priority_spec_default_init.rst

doc/Makefile.am

@@ -69,6 +69,7 @@ APIDOCS= \
 	nghttp2_option_set_peer_max_concurrent_streams.rst \
 	nghttp2_option_set_user_recv_extension_type.rst \
 	nghttp2_option_set_max_outbound_ack.rst \
+	nghttp2_option_set_max_settings.rst \
 	nghttp2_pack_settings_payload.rst \
 	nghttp2_priority_spec_check_default.rst \
 	nghttp2_priority_spec_default_init.rst \

lib/includes/nghttp2/nghttp2.h

@@ -228,6 +228,13 @@ typedef struct {
  */
 #define NGHTTP2_CLIENT_MAGIC_LEN 24
 
+/**
+ * @macro
+ *
+ * The default max number of settings per SETTINGS frame
+ */
+#define NGHTTP2_DEFAULT_MAX_SETTINGS 32
+
 /**
  * @enum
  *
@@ -398,6 +405,11 @@ typedef enum {
    * receives an other type of frame.
    */
   NGHTTP2_ERR_SETTINGS_EXPECTED = -536,
+  /**
+   * When a local endpoint receives too many settings entries
+   * in a single SETTINGS frame.
+   */
+  NGHTTP2_ERR_TOO_MANY_SETTINGS = -537,
   /**
    * The errors < :enum:`NGHTTP2_ERR_FATAL` mean that the library is
    * under unexpected condition and processing was terminated (e.g.,
@@ -2659,6 +2671,17 @@ NGHTTP2_EXTERN void nghttp2_option_set_no_closed_streams(nghttp2_option *option,
 NGHTTP2_EXTERN void nghttp2_option_set_max_outbound_ack(nghttp2_option *option,
                                                         size_t val);
 
+/**
+ * @function
+ *
+ * This function sets the maximum number of SETTINGS entries per
+ * SETTINGS frame that will be accepted. If more than those entries
+ * are received, the peer is considered to be misbehaving and session
+ * will be closed. The default value is 32.
+ */
+NGHTTP2_EXTERN void nghttp2_option_set_max_settings(nghttp2_option *option,
+                                                    size_t val);
+
 /**
  * @function
  *

lib/nghttp2_helper.c

@@ -334,6 +334,8 @@ const char *nghttp2_strerror(int error_code) {
   case NGHTTP2_ERR_FLOODED:
     return "Flooding was detected in this HTTP/2 session, and it must be "
            "closed";
+  case NGHTTP2_ERR_TOO_MANY_SETTINGS:
+    return "SETTINGS frame contained more than the maximum allowed entries";
   default:
     return "Unknown error code";
   }

lib/nghttp2_option.c

@@ -121,3 +121,8 @@ void nghttp2_option_set_max_outbound_ack(nghttp2_option *option, size_t val) {
   option->opt_set_mask |= NGHTTP2_OPT_MAX_OUTBOUND_ACK;
   option->max_outbound_ack = val;
 }
+
+void nghttp2_option_set_max_settings(nghttp2_option *option, size_t val) {
+  option->opt_set_mask |= NGHTTP2_OPT_MAX_SETTINGS;
+  option->max_settings = val;
+}

lib/nghttp2_option.h

@@ -67,6 +67,7 @@ typedef enum {
   NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE = 1 << 9,
   NGHTTP2_OPT_NO_CLOSED_STREAMS = 1 << 10,
   NGHTTP2_OPT_MAX_OUTBOUND_ACK = 1 << 11,
+  NGHTTP2_OPT_MAX_SETTINGS = 1 << 12,
 } nghttp2_option_flag;
 
 /**
@@ -85,6 +86,10 @@ struct nghttp2_option {
    * NGHTTP2_OPT_MAX_OUTBOUND_ACK
    */
   size_t max_outbound_ack;
+  /**
+   * NGHTTP2_OPT_MAX_SETTINGS
+   */
+  size_t max_settings;
   /**
    * Bitwise OR of nghttp2_option_flag to determine that which fields
    * are specified.

lib/nghttp2_session.c

@@ -458,6 +458,7 @@ static int session_new(nghttp2_session **session_ptr,
 
   (*session_ptr)->max_send_header_block_length = NGHTTP2_MAX_HEADERSLEN;
   (*session_ptr)->max_outbound_ack = NGHTTP2_DEFAULT_MAX_OBQ_FLOOD_ITEM;
+  (*session_ptr)->max_settings = NGHTTP2_DEFAULT_MAX_SETTINGS;
 
   if (option) {
     if ((option->opt_set_mask & NGHTTP2_OPT_NO_AUTO_WINDOW_UPDATE) &&
@@ -521,6 +522,11 @@ static int session_new(nghttp2_session **session_ptr,
     if (option->opt_set_mask & NGHTTP2_OPT_MAX_OUTBOUND_ACK) {
       (*session_ptr)->max_outbound_ack = option->max_outbound_ack;
     }
+
+    if ((option->opt_set_mask & NGHTTP2_OPT_MAX_SETTINGS) &&
+        option->max_settings) {
+      (*session_ptr)->max_settings = option->max_settings;
+    }
   }
 
   rv = nghttp2_hd_deflate_init2(&(*session_ptr)->hd_deflater,
@@ -5657,6 +5663,16 @@ ssize_t nghttp2_session_mem_recv(nghttp2_session *session, const uint8_t *in,
           iframe->max_niv =
               iframe->frame.hd.length / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH + 1;
 
+          if (iframe->max_niv - 1 > session->max_settings) {
+            rv = nghttp2_session_terminate_session_with_reason(
+                session, NGHTTP2_ENHANCE_YOUR_CALM,
+                "SETTINGS: too many setting entries");
+            if (nghttp2_is_fatal(rv)) {
+              return rv;
+            }
+            return (ssize_t)inlen;
+          }
+
           iframe->iv = nghttp2_mem_malloc(mem, sizeof(nghttp2_settings_entry) *
                                                    iframe->max_niv);
 
@@ -7425,6 +7441,11 @@ static int nghttp2_session_upgrade_internal(nghttp2_session *session,
   if (settings_payloadlen % NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH) {
     return NGHTTP2_ERR_INVALID_ARGUMENT;
   }
+  /* SETTINGS frame contains too many settings */
+  if (settings_payloadlen / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH
+        > session->max_settings) {
+    return NGHTTP2_ERR_TOO_MANY_SETTINGS;
+  }
   rv = nghttp2_frame_unpack_settings_payload2(&iv, &niv, settings_payload,
                                               settings_payloadlen, mem);
   if (rv != 0) {

lib/nghttp2_session.h

@@ -267,6 +267,8 @@ struct nghttp2_session {
   /* The maximum length of header block to send.  Calculated by the
      same way as nghttp2_hd_deflate_bound() does. */
   size_t max_send_header_block_length;
+  /* The maximum number of settings accepted per SETTINGS frame. */
+  size_t max_settings;
   /* Next Stream ID. Made unsigned int to detect >= (1 << 31). */
   uint32_t next_stream_id;
   /* The last stream ID this session initiated.  For client session,

tests/main.c

@@ -317,6 +317,8 @@ int main() {
                    test_nghttp2_session_set_local_window_size) ||
       !CU_add_test(pSuite, "session_cancel_from_before_frame_send",
                    test_nghttp2_session_cancel_from_before_frame_send) ||
+      !CU_add_test(pSuite, "session_too_many_settings",
+                   test_nghttp2_session_too_many_settings) ||
       !CU_add_test(pSuite, "session_removed_closed_stream",
                    test_nghttp2_session_removed_closed_stream) ||
       !CU_add_test(pSuite, "session_pause_data",

tests/nghttp2_session_test.c

@@ -10614,6 +10614,67 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
   nghttp2_session_del(session);
 }
 
+void test_nghttp2_session_too_many_settings(void) {
+  nghttp2_session *session;
+  nghttp2_option *option;
+  nghttp2_session_callbacks callbacks;
+  nghttp2_frame frame;
+  nghttp2_bufs bufs;
+  nghttp2_buf *buf;
+  ssize_t rv;
+  my_user_data ud;
+  nghttp2_settings_entry iv[3];
+  nghttp2_mem *mem;
+  nghttp2_outbound_item *item;
+
+  mem = nghttp2_mem_default();
+  frame_pack_bufs_init(&bufs);
+
+  memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
+  callbacks.on_frame_recv_callback = on_frame_recv_callback;
+  callbacks.send_callback = null_send_callback;
+
+  nghttp2_option_new(&option);
+  nghttp2_option_set_max_settings(option, 1);
+
+  nghttp2_session_client_new2(&session, &callbacks, &ud, option);
+
+  CU_ASSERT(1 == session->max_settings);
+
+  nghttp2_option_del(option);
+
+  iv[0].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
+  iv[0].value = 3000;
+
+  iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
+  iv[1].value = 16384;
+
+  nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, dup_iv(iv, 2),
+                              2);
+
+  rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
+
+  CU_ASSERT(0 == rv);
+  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+
+  nghttp2_frame_settings_free(&frame.settings, mem);
+
+  buf = &bufs.head->buf;
+  assert(nghttp2_bufs_len(&bufs) == nghttp2_buf_len(buf));
+
+  ud.frame_recv_cb_called = 0;
+
+  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+
+  item = nghttp2_session_get_next_ob_item(session);
+  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+
+  nghttp2_bufs_reset(&bufs);
+  nghttp2_bufs_free(&bufs);
+  nghttp2_session_del(session);
+}
+
 static void
 prepare_session_removed_closed_stream(nghttp2_session *session,
                                       nghttp2_hd_deflater *deflater) {

tests/nghttp2_session_test.h

@@ -156,6 +156,7 @@ void test_nghttp2_session_repeated_priority_change(void);
 void test_nghttp2_session_repeated_priority_submission(void);
 void test_nghttp2_session_set_local_window_size(void);
 void test_nghttp2_session_cancel_from_before_frame_send(void);
+void test_nghttp2_session_too_many_settings(void);
 void test_nghttp2_session_removed_closed_stream(void);
 void test_nghttp2_session_pause_data(void);
 void test_nghttp2_session_no_closed_streams(void);