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Fix backfilled events being rejected for no state_groups
(#10439)
Reproducible on a federated homeserver when there is a membership auth event as a floating outlier. Then when we try to backfill one of that persons messages, it has missing membership auth to fetch which caused us to mistakenly replace the `context` for the message with that of the floating membership `outlier` event. Since `outliers` have no `state` or `state_group`, the error bubbles up when we continue down the persisting route: `sqlite3.IntegrityError: NOT NULL constraint failed: event_to_state_groups.state_group` Call stack: ``` backfill _auth_and_persist_event _check_event_auth _update_auth_events_and_context_for_auth ```
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changelog.d/10439.bugfix
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changelog.d/10439.bugfix
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Fix events with floating outlier state being rejected over federation.
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@ -12,6 +12,7 @@
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from typing import List
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from unittest import TestCase
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from synapse.api.constants import EventTypes
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@ -22,6 +23,7 @@ from synapse.federation.federation_base import event_from_pdu_json
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from synapse.logging.context import LoggingContext, run_in_background
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from synapse.rest import admin
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from synapse.rest.client.v1 import login, room
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from synapse.util.stringutils import random_string
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from tests import unittest
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@ -39,6 +41,8 @@ class FederationTestCase(unittest.HomeserverTestCase):
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hs = self.setup_test_homeserver(federation_http_client=None)
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self.handler = hs.get_federation_handler()
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self.store = hs.get_datastore()
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self.state_store = hs.get_storage().state
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self._event_auth_handler = hs.get_event_auth_handler()
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return hs
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def test_exchange_revoked_invite(self):
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@ -190,6 +194,133 @@ class FederationTestCase(unittest.HomeserverTestCase):
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self.assertEqual(sg, sg2)
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def test_backfill_floating_outlier_membership_auth(self):
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"""
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As the local homeserver, check that we can properly process a federated
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event from the OTHER_SERVER with auth_events that include a floating
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membership event from the OTHER_SERVER.
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Regression test, see #10439.
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"""
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OTHER_SERVER = "otherserver"
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OTHER_USER = "@otheruser:" + OTHER_SERVER
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# create the room
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user_id = self.register_user("kermit", "test")
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tok = self.login("kermit", "test")
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room_id = self.helper.create_room_as(
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room_creator=user_id,
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is_public=True,
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tok=tok,
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extra_content={
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"preset": "public_chat",
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},
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)
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room_version = self.get_success(self.store.get_room_version(room_id))
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prev_event_ids = self.get_success(self.store.get_prev_events_for_room(room_id))
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(
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most_recent_prev_event_id,
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most_recent_prev_event_depth,
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) = self.get_success(self.store.get_max_depth_of(prev_event_ids))
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# mapping from (type, state_key) -> state_event_id
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prev_state_map = self.get_success(
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self.state_store.get_state_ids_for_event(most_recent_prev_event_id)
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)
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# List of state event ID's
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prev_state_ids = list(prev_state_map.values())
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auth_event_ids = prev_state_ids
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auth_events = list(
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self.get_success(self.store.get_events(auth_event_ids)).values()
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)
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# build a floating outlier member state event
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fake_prev_event_id = "$" + random_string(43)
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member_event_dict = {
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"type": EventTypes.Member,
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"content": {
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"membership": "join",
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},
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"state_key": OTHER_USER,
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"room_id": room_id,
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"sender": OTHER_USER,
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"depth": most_recent_prev_event_depth,
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"prev_events": [fake_prev_event_id],
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"origin_server_ts": self.clock.time_msec(),
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"signatures": {OTHER_SERVER: {"ed25519:key_version": "SomeSignatureHere"}},
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}
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builder = self.hs.get_event_builder_factory().for_room_version(
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room_version, member_event_dict
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)
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member_event = self.get_success(
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builder.build(
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prev_event_ids=member_event_dict["prev_events"],
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auth_event_ids=self._event_auth_handler.compute_auth_events(
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builder,
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prev_state_map,
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for_verification=False,
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),
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depth=member_event_dict["depth"],
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)
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)
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# Override the signature added from "test" homeserver that we created the event with
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member_event.signatures = member_event_dict["signatures"]
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# Add the new member_event to the StateMap
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prev_state_map[
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(member_event.type, member_event.state_key)
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] = member_event.event_id
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auth_events.append(member_event)
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# build and send an event authed based on the member event
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message_event_dict = {
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"type": EventTypes.Message,
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"content": {},
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"room_id": room_id,
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"sender": OTHER_USER,
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"depth": most_recent_prev_event_depth,
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"prev_events": prev_event_ids.copy(),
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"origin_server_ts": self.clock.time_msec(),
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"signatures": {OTHER_SERVER: {"ed25519:key_version": "SomeSignatureHere"}},
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}
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builder = self.hs.get_event_builder_factory().for_room_version(
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room_version, message_event_dict
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)
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message_event = self.get_success(
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builder.build(
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prev_event_ids=message_event_dict["prev_events"],
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auth_event_ids=self._event_auth_handler.compute_auth_events(
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builder,
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prev_state_map,
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for_verification=False,
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),
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depth=message_event_dict["depth"],
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)
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)
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# Override the signature added from "test" homeserver that we created the event with
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message_event.signatures = message_event_dict["signatures"]
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# Stub the /event_auth response from the OTHER_SERVER
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async def get_event_auth(
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destination: str, room_id: str, event_id: str
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) -> List[EventBase]:
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return auth_events
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self.handler.federation_client.get_event_auth = get_event_auth
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with LoggingContext("receive_pdu"):
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# Fake the OTHER_SERVER federating the message event over to our local homeserver
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d = run_in_background(
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self.handler.on_receive_pdu, OTHER_SERVER, message_event
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)
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self.get_success(d)
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# Now try and get the events on our local homeserver
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stored_event = self.get_success(
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self.store.get_event(message_event.event_id, allow_none=True)
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)
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self.assertTrue(stored_event is not None)
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@unittest.override_config(
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{"rc_invites": {"per_user": {"per_second": 0.5, "burst_count": 3}}}
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)
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