diff options
| -rw-r--r-- | changelog.d/14314.bugfix | 1 | ||||
| -rw-r--r-- | synapse/api/ratelimiting.py | 8 | ||||
| -rw-r--r-- | synapse/handlers/room.py | 16 | ||||
| -rw-r--r-- | tests/rest/client/test_rooms.py | 54 |
4 files changed, 70 insertions, 9 deletions
diff --git a/changelog.d/14314.bugfix b/changelog.d/14314.bugfix new file mode 100644 index 0000000000..8be47ee083 --- /dev/null +++ b/changelog.d/14314.bugfix @@ -0,0 +1 @@ +Fix room creation being rate limited too aggressively since Synapse v1.69.0. \ No newline at end of file diff --git a/synapse/api/ratelimiting.py b/synapse/api/ratelimiting.py index 044c7d4926..511790c7c5 100644 --- a/synapse/api/ratelimiting.py +++ b/synapse/api/ratelimiting.py @@ -343,6 +343,7 @@ class RequestRatelimiter: requester: Requester, update: bool = True, is_admin_redaction: bool = False, + n_actions: int = 1, ) -> None: """Ratelimits requests. @@ -355,6 +356,8 @@ class RequestRatelimiter: is_admin_redaction: Whether this is a room admin/moderator redacting an event. If so then we may apply different ratelimits depending on config. + n_actions: Multiplier for the number of actions to apply to the + rate limiter at once. Raises: LimitExceededError if the request should be ratelimited @@ -383,7 +386,9 @@ class RequestRatelimiter: if is_admin_redaction and self.admin_redaction_ratelimiter: # If we have separate config for admin redactions, use a separate # ratelimiter as to not have user_ids clash - await self.admin_redaction_ratelimiter.ratelimit(requester, update=update) + await self.admin_redaction_ratelimiter.ratelimit( + requester, update=update, n_actions=n_actions + ) else: # Override rate and burst count per-user await self.request_ratelimiter.ratelimit( @@ -391,4 +396,5 @@ class RequestRatelimiter: rate_hz=messages_per_second, burst_count=burst_count, update=update, + n_actions=n_actions, ) diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py index 638f54051a..d74b675adc 100644 --- a/synapse/handlers/room.py +++ b/synapse/handlers/room.py @@ -559,7 +559,6 @@ class RoomCreationHandler: invite_list=[], initial_state=initial_state, creation_content=creation_content, - ratelimit=False, ) # Transfer membership events @@ -753,6 +752,10 @@ class RoomCreationHandler: ) if ratelimit: + # Rate limit once in advance, but don't rate limit the individual + # events in the room — room creation isn't atomic and it's very + # janky if half the events in the initial state don't make it because + # of rate limiting. await self.request_ratelimiter.ratelimit(requester) room_version_id = config.get( @@ -913,7 +916,6 @@ class RoomCreationHandler: room_alias=room_alias, power_level_content_override=power_level_content_override, creator_join_profile=creator_join_profile, - ratelimit=ratelimit, ) if "name" in config: @@ -1037,7 +1039,6 @@ class RoomCreationHandler: room_alias: Optional[RoomAlias] = None, power_level_content_override: Optional[JsonDict] = None, creator_join_profile: Optional[JsonDict] = None, - ratelimit: bool = True, ) -> Tuple[int, str, int]: """Sends the initial events into a new room. Sends the room creation, membership, and power level events into the room sequentially, then creates and batches up the @@ -1046,6 +1047,8 @@ class RoomCreationHandler: `power_level_content_override` doesn't apply when initial state has power level state event content. + Rate limiting should already have been applied by this point. + Returns: A tuple containing the stream ID, event ID and depth of the last event sent to the room. @@ -1144,7 +1147,7 @@ class RoomCreationHandler: creator.user, room_id, "join", - ratelimit=ratelimit, + ratelimit=False, content=creator_join_profile, new_room=True, prev_event_ids=[last_sent_event_id], @@ -1269,7 +1272,10 @@ class RoomCreationHandler: events_to_send.append((encryption_event, encryption_context)) last_event = await self.event_creation_handler.handle_new_client_event( - creator, events_to_send, ignore_shadow_ban=True + creator, + events_to_send, + ignore_shadow_ban=True, + ratelimit=False, ) assert last_event.internal_metadata.stream_ordering is not None return last_event.internal_metadata.stream_ordering, last_event.event_id, depth diff --git a/tests/rest/client/test_rooms.py b/tests/rest/client/test_rooms.py index 716366eb90..1084d4ad9d 100644 --- a/tests/rest/client/test_rooms.py +++ b/tests/rest/client/test_rooms.py @@ -54,6 +54,7 @@ from tests.http.server._base import make_request_with_cancellation_test from tests.storage.test_stream import PaginationTestCase from tests.test_utils import make_awaitable from tests.test_utils.event_injection import create_event +from tests.unittest import override_config PATH_PREFIX = b"/_matrix/client/api/v1" @@ -871,6 +872,41 @@ class RoomsCreateTestCase(RoomBase): self.assertEqual(channel.code, HTTPStatus.OK, channel.json_body) self.assertEqual(join_mock.call_count, 0) + def _create_basic_room(self) -> Tuple[int, object]: + """ + Tries to create a basic room and returns the response code. + """ + channel = self.make_request( + "POST", + "/createRoom", + {}, + ) + return channel.code, channel.json_body + + @override_config( + { + "rc_message": {"per_second": 0.2, "burst_count": 10}, + } + ) + def test_room_creation_ratelimiting(self) -> None: + """ + Regression test for #14312, where ratelimiting was made too strict. + Clients should be able to create 10 rooms in a row + without hitting rate limits, using default rate limit config. + (We override rate limiting config back to its default value.) + + To ensure we don't make ratelimiting too generous accidentally, + also check that we can't create an 11th room. + """ + + for _ in range(10): + code, json_body = self._create_basic_room() + self.assertEqual(code, HTTPStatus.OK, json_body) + + # The 6th room hits the rate limit. + code, json_body = self._create_basic_room() + self.assertEqual(code, HTTPStatus.TOO_MANY_REQUESTS, json_body) + class RoomTopicTestCase(RoomBase): """Tests /rooms/$room_id/topic REST events.""" @@ -1390,10 +1426,22 @@ class RoomJoinRatelimitTestCase(RoomBase): ) def test_join_local_ratelimit(self) -> None: """Tests that local joins are actually rate-limited.""" - for _ in range(3): - self.helper.create_room_as(self.user_id) + # Create 4 rooms + room_ids = [ + self.helper.create_room_as(self.user_id, is_public=True) for _ in range(4) + ] + + joiner_user_id = self.register_user("joiner", "secret") + # Now make a new user try to join some of them. - self.helper.create_room_as(self.user_id, expect_code=429) + # The user can join 3 rooms + for room_id in room_ids[0:3]: + self.helper.join(room_id, joiner_user_id) + + # But the user cannot join a 4th room + self.helper.join( + room_ids[3], joiner_user_id, expect_code=HTTPStatus.TOO_MANY_REQUESTS + ) @unittest.override_config( {"rc_joins": {"local": {"per_second": 0.5, "burst_count": 3}}} |