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1148 lines
47 KiB
Python
1148 lines
47 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2022 The Matrix.org Foundation C.I.C.
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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from typing import Optional
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from unittest import mock
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from twisted.test.proto_helpers import MemoryReactor
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from synapse.api.errors import AuthError, StoreError
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from synapse.api.room_versions import RoomVersion
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from synapse.event_auth import (
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check_state_dependent_auth_rules,
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check_state_independent_auth_rules,
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)
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from synapse.events import make_event_from_dict
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from synapse.events.snapshot import EventContext
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from synapse.federation.transport.client import StateRequestResponse
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from synapse.logging.context import LoggingContext
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from synapse.rest import admin
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from synapse.rest.client import login, room
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from synapse.server import HomeServer
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from synapse.state import StateResolutionStore
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from synapse.state.v2 import _mainline_sort, _reverse_topological_power_sort
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from synapse.types import JsonDict
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from synapse.util import Clock
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from tests import unittest
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from tests.test_utils import event_injection
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class FederationEventHandlerTests(unittest.FederatingHomeserverTestCase):
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servlets = [
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admin.register_servlets,
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login.register_servlets,
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room.register_servlets,
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]
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def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
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# mock out the federation transport client
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self.mock_federation_transport_client = mock.Mock(
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spec=["get_room_state_ids", "get_room_state", "get_event", "backfill"]
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)
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self.mock_federation_transport_client.get_room_state_ids = mock.AsyncMock()
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self.mock_federation_transport_client.get_room_state = mock.AsyncMock()
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self.mock_federation_transport_client.get_event = mock.AsyncMock()
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self.mock_federation_transport_client.backfill = mock.AsyncMock()
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return super().setup_test_homeserver(
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federation_transport_client=self.mock_federation_transport_client
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)
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def test_process_pulled_event_with_missing_state(self) -> None:
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"""Ensure that we correctly handle pulled events with lots of missing state
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In this test, we pretend we are processing a "pulled" event (eg, via backfill
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or get_missing_events). The pulled event has a prev_event we haven't previously
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seen, so the server requests the state at that prev_event. There is a lot
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of state we don't have, so we expect the server to make a /state request.
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We check that the pulled event is correctly persisted, and that the state is
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as we expect.
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"""
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return self._test_process_pulled_event_with_missing_state(False)
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def test_process_pulled_event_with_missing_state_where_prev_is_outlier(
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self,
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) -> None:
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"""Ensure that we correctly handle pulled events with lots of missing state
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A slight modification to test_process_pulled_event_with_missing_state. Again
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we have a "pulled" event which refers to a prev_event with lots of state,
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but in this case we already have the prev_event (as an outlier, obviously -
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if it were a regular event, we wouldn't need to request the state).
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"""
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return self._test_process_pulled_event_with_missing_state(True)
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def _test_process_pulled_event_with_missing_state(
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self, prev_exists_as_outlier: bool
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) -> None:
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OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
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main_store = self.hs.get_datastores().main
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state_storage_controller = self.hs.get_storage_controllers().state
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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(room_creator=user_id, tok=tok)
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room_version = self.get_success(main_store.get_room_version(room_id))
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# allow the remote user to send state events
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self.helper.send_state(
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room_id,
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"m.room.power_levels",
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{"events_default": 0, "state_default": 0},
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tok=tok,
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)
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# add the remote user to the room
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member_event = self.get_success(
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event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
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)
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initial_state_map = self.get_success(
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main_store.get_partial_current_state_ids(room_id)
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)
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auth_event_ids = [
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initial_state_map[("m.room.create", "")],
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initial_state_map[("m.room.power_levels", "")],
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member_event.event_id,
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]
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# mock up a load of state events which we are missing
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state_events = [
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make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_state_type",
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"state_key": f"state_{i}",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [member_event.event_id],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 10,
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"content": {"body": f"state_{i}"},
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}
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),
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room_version,
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)
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for i in range(1, 10)
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]
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# this is the state that we are going to claim is active at the prev_event.
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state_at_prev_event = state_events + self.get_success(
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main_store.get_events_as_list(initial_state_map.values())
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)
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# mock up a prev event.
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# Depending on the test, we either persist this upfront (as an outlier),
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# or let the server request it.
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prev_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 11,
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"content": {"body": "missing_prev"},
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}
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),
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room_version,
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)
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if prev_exists_as_outlier:
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prev_event.internal_metadata.outlier = True
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persistence = self.hs.get_storage_controllers().persistence
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assert persistence is not None
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self.get_success(
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persistence.persist_event(
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prev_event,
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EventContext.for_outlier(self.hs.get_storage_controllers()),
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)
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)
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else:
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async def get_event(
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destination: str, event_id: str, timeout: Optional[int] = None
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) -> JsonDict:
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self.assertEqual(destination, self.OTHER_SERVER_NAME)
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self.assertEqual(event_id, prev_event.event_id)
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return {"pdus": [prev_event.get_pdu_json()]}
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self.mock_federation_transport_client.get_event.side_effect = get_event
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# mock up a regular event to pass into _process_pulled_event
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pulled_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [prev_event.event_id],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 12,
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"content": {"body": "pulled"},
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}
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),
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room_version,
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)
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# we expect an outbound request to /state_ids, so stub that out
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self.mock_federation_transport_client.get_room_state_ids.return_value = {
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"pdu_ids": [e.event_id for e in state_at_prev_event],
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"auth_chain_ids": [],
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}
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# we also expect an outbound request to /state
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self.mock_federation_transport_client.get_room_state.return_value = (
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StateRequestResponse(auth_events=[], state=state_at_prev_event)
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)
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# we have to bump the clock a bit, to keep the retry logic in
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# FederationClient.get_pdu happy
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self.reactor.advance(60000)
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# Finally, the call under test: send the pulled event into _process_pulled_event
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=False
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)
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)
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# check that the event is correctly persisted
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persisted = self.get_success(main_store.get_event(pulled_event.event_id))
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self.assertIsNotNone(persisted, "pulled event was not persisted at all")
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self.assertFalse(
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persisted.internal_metadata.is_outlier(), "pulled event was an outlier"
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)
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# check that the state at that event is as expected
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state = self.get_success(
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state_storage_controller.get_state_ids_for_event(pulled_event.event_id)
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)
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expected_state = {
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(e.type, e.state_key): e.event_id for e in state_at_prev_event
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}
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self.assertEqual(state, expected_state)
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if prev_exists_as_outlier:
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self.mock_federation_transport_client.get_event.assert_not_called()
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def test_process_pulled_event_records_failed_backfill_attempts(
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self,
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) -> None:
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"""
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Test to make sure that failed backfill attempts for an event are
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recorded in the `event_failed_pull_attempts` table.
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In this test, we pretend we are processing a "pulled" event via
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backfill. The pulled event has a fake `prev_event` which our server has
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obviously never seen before so it attempts to request the state at that
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`prev_event` which expectedly fails because it's a fake event. Because
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the server can't fetch the state at the missing `prev_event`, the
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"pulled" event fails the history check and is fails to process.
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We check that we correctly record the number of failed pull attempts
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of the pulled event and as a sanity check, that the "pulled" event isn't
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persisted.
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"""
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OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
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main_store = self.hs.get_datastores().main
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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(room_creator=user_id, tok=tok)
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room_version = self.get_success(main_store.get_room_version(room_id))
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# We expect an outbound request to /state_ids, so stub that out
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self.mock_federation_transport_client.get_room_state_ids.return_value = {
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# Mimic the other server not knowing about the state at all.
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# We want to cause Synapse to throw an error (`Unable to get
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# missing prev_event $fake_prev_event`) and fail to backfill
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# the pulled event.
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"pdu_ids": [],
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"auth_chain_ids": [],
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}
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# We also expect an outbound request to /state
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self.mock_federation_transport_client.get_room_state.return_value = StateRequestResponse(
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# Mimic the other server not knowing about the state at all.
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# We want to cause Synapse to throw an error (`Unable to get
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# missing prev_event $fake_prev_event`) and fail to backfill
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# the pulled event.
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auth_events=[],
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state=[],
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)
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pulled_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [
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# The fake prev event will make the pulled event fail
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# the history check (`Unable to get missing prev_event
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# $fake_prev_event`)
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"$fake_prev_event"
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],
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"auth_events": [],
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"origin_server_ts": 1,
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"depth": 12,
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"content": {"body": "pulled"},
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}
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),
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room_version,
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)
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# The function under test: try to process the pulled event
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=True
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)
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)
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# Make sure our failed pull attempt was recorded
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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)
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)
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self.assertEqual(backfill_num_attempts, 1)
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# The function under test: try to process the pulled event again
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=True
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)
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)
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# Make sure our second failed pull attempt was recorded (`num_attempts` was incremented)
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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)
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)
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self.assertEqual(backfill_num_attempts, 2)
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# And as a sanity check, make sure the event was not persisted through all of this.
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persisted = self.get_success(
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main_store.get_event(pulled_event.event_id, allow_none=True)
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)
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self.assertIsNone(
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persisted,
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"pulled event that fails the history check should not be persisted at all",
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)
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def test_process_pulled_event_clears_backfill_attempts_after_being_successfully_persisted(
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self,
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) -> None:
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"""
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Test to make sure that failed pull attempts
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(`event_failed_pull_attempts` table) for an event are cleared after the
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event is successfully persisted.
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In this test, we pretend we are processing a "pulled" event via
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backfill. The pulled event succesfully processes and the backward
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extremeties are updated along with clearing out any failed pull attempts
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for those old extremities.
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We check that we correctly cleared failed pull attempts of the
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pulled event.
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"""
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OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
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main_store = self.hs.get_datastores().main
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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(room_creator=user_id, tok=tok)
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room_version = self.get_success(main_store.get_room_version(room_id))
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# allow the remote user to send state events
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self.helper.send_state(
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room_id,
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"m.room.power_levels",
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{"events_default": 0, "state_default": 0},
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tok=tok,
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)
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# add the remote user to the room
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member_event = self.get_success(
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event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
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)
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initial_state_map = self.get_success(
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main_store.get_partial_current_state_ids(room_id)
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)
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auth_event_ids = [
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initial_state_map[("m.room.create", "")],
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initial_state_map[("m.room.power_levels", "")],
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member_event.event_id,
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]
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pulled_event = make_event_from_dict(
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self.add_hashes_and_signatures_from_other_server(
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{
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"type": "test_regular_type",
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"room_id": room_id,
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"sender": OTHER_USER,
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"prev_events": [member_event.event_id],
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"auth_events": auth_event_ids,
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"origin_server_ts": 1,
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"depth": 12,
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"content": {"body": "pulled"},
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}
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),
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room_version,
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)
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# Fake the "pulled" event failing to backfill once so we can test
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# if it's cleared out later on.
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self.get_success(
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main_store.record_event_failed_pull_attempt(
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pulled_event.room_id, pulled_event.event_id, "fake cause"
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)
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)
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# Make sure we have a failed pull attempt recorded for the pulled event
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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)
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)
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self.assertEqual(backfill_num_attempts, 1)
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# The function under test: try to process the pulled event
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with LoggingContext("test"):
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self.get_success(
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self.hs.get_federation_event_handler()._process_pulled_event(
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self.OTHER_SERVER_NAME, pulled_event, backfilled=True
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)
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)
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# Make sure the failed pull attempts for the pulled event are cleared
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backfill_num_attempts = self.get_success(
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main_store.db_pool.simple_select_one_onecol(
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table="event_failed_pull_attempts",
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keyvalues={"event_id": pulled_event.event_id},
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retcol="num_attempts",
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allow_none=True,
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)
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)
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self.assertIsNone(backfill_num_attempts)
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# And as a sanity check, make sure the "pulled" event was persisted.
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persisted = self.get_success(
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main_store.get_event(pulled_event.event_id, allow_none=True)
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)
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self.assertIsNotNone(persisted, "pulled event was not persisted at all")
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|
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def test_backfill_signature_failure_does_not_fetch_same_prev_event_later(
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self,
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) -> None:
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"""
|
|
Test to make sure we backoff and don't try to fetch a missing prev_event when we
|
|
already know it has a invalid signature from checking the signatures of all of
|
|
the events in the backfill response.
|
|
"""
|
|
OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
|
|
main_store = self.hs.get_datastores().main
|
|
|
|
# Create the room
|
|
user_id = self.register_user("kermit", "test")
|
|
tok = self.login("kermit", "test")
|
|
room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
|
|
room_version = self.get_success(main_store.get_room_version(room_id))
|
|
|
|
# Allow the remote user to send state events
|
|
self.helper.send_state(
|
|
room_id,
|
|
"m.room.power_levels",
|
|
{"events_default": 0, "state_default": 0},
|
|
tok=tok,
|
|
)
|
|
|
|
# Add the remote user to the room
|
|
member_event = self.get_success(
|
|
event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
|
|
)
|
|
|
|
initial_state_map = self.get_success(
|
|
main_store.get_partial_current_state_ids(room_id)
|
|
)
|
|
|
|
auth_event_ids = [
|
|
initial_state_map[("m.room.create", "")],
|
|
initial_state_map[("m.room.power_levels", "")],
|
|
member_event.event_id,
|
|
]
|
|
|
|
# We purposely don't run `add_hashes_and_signatures_from_other_server`
|
|
# over this because we want the signature check to fail.
|
|
pulled_event_without_signatures = make_event_from_dict(
|
|
{
|
|
"type": "test_regular_type",
|
|
"room_id": room_id,
|
|
"sender": OTHER_USER,
|
|
"prev_events": [member_event.event_id],
|
|
"auth_events": auth_event_ids,
|
|
"origin_server_ts": 1,
|
|
"depth": 12,
|
|
"content": {"body": "pulled_event_without_signatures"},
|
|
},
|
|
room_version,
|
|
)
|
|
|
|
# Create a regular event that should pass except for the
|
|
# `pulled_event_without_signatures` in the `prev_event`.
|
|
pulled_event = make_event_from_dict(
|
|
self.add_hashes_and_signatures_from_other_server(
|
|
{
|
|
"type": "test_regular_type",
|
|
"room_id": room_id,
|
|
"sender": OTHER_USER,
|
|
"prev_events": [
|
|
member_event.event_id,
|
|
pulled_event_without_signatures.event_id,
|
|
],
|
|
"auth_events": auth_event_ids,
|
|
"origin_server_ts": 1,
|
|
"depth": 12,
|
|
"content": {"body": "pulled_event"},
|
|
}
|
|
),
|
|
room_version,
|
|
)
|
|
|
|
# We expect an outbound request to /backfill, so stub that out
|
|
self.mock_federation_transport_client.backfill.return_value = {
|
|
"origin": self.OTHER_SERVER_NAME,
|
|
"origin_server_ts": 123,
|
|
"pdus": [
|
|
# This is one of the important aspects of this test: we include
|
|
# `pulled_event_without_signatures` so it fails the signature check
|
|
# when we filter down the backfill response down to events which
|
|
# have valid signatures in
|
|
# `_check_sigs_and_hash_for_pulled_events_and_fetch`
|
|
pulled_event_without_signatures.get_pdu_json(),
|
|
# Then later when we process this valid signature event, when we
|
|
# fetch the missing `prev_event`s, we want to make sure that we
|
|
# backoff and don't try and fetch `pulled_event_without_signatures`
|
|
# again since we know it just had an invalid signature.
|
|
pulled_event.get_pdu_json(),
|
|
],
|
|
}
|
|
|
|
# Keep track of the count and make sure we don't make any of these requests
|
|
event_endpoint_requested_count = 0
|
|
room_state_ids_endpoint_requested_count = 0
|
|
room_state_endpoint_requested_count = 0
|
|
|
|
async def get_event(
|
|
destination: str, event_id: str, timeout: Optional[int] = None
|
|
) -> None:
|
|
nonlocal event_endpoint_requested_count
|
|
event_endpoint_requested_count += 1
|
|
|
|
async def get_room_state_ids(
|
|
destination: str, room_id: str, event_id: str
|
|
) -> None:
|
|
nonlocal room_state_ids_endpoint_requested_count
|
|
room_state_ids_endpoint_requested_count += 1
|
|
|
|
async def get_room_state(
|
|
room_version: RoomVersion, destination: str, room_id: str, event_id: str
|
|
) -> None:
|
|
nonlocal room_state_endpoint_requested_count
|
|
room_state_endpoint_requested_count += 1
|
|
|
|
# We don't expect an outbound request to `/event`, `/state_ids`, or `/state` in
|
|
# the happy path but if the logic is sneaking around what we expect, stub that
|
|
# out so we can detect that failure
|
|
self.mock_federation_transport_client.get_event.side_effect = get_event
|
|
self.mock_federation_transport_client.get_room_state_ids.side_effect = (
|
|
get_room_state_ids
|
|
)
|
|
self.mock_federation_transport_client.get_room_state.side_effect = (
|
|
get_room_state
|
|
)
|
|
|
|
# The function under test: try to backfill and process the pulled event
|
|
with LoggingContext("test"):
|
|
self.get_success(
|
|
self.hs.get_federation_event_handler().backfill(
|
|
self.OTHER_SERVER_NAME,
|
|
room_id,
|
|
limit=1,
|
|
extremities=["$some_extremity"],
|
|
)
|
|
)
|
|
|
|
if event_endpoint_requested_count > 0:
|
|
self.fail(
|
|
"We don't expect an outbound request to /event in the happy path but if "
|
|
"the logic is sneaking around what we expect, make sure to fail the test. "
|
|
"We don't expect it because the signature failure should cause us to backoff "
|
|
"and not asking about pulled_event_without_signatures="
|
|
f"{pulled_event_without_signatures.event_id} again"
|
|
)
|
|
|
|
if room_state_ids_endpoint_requested_count > 0:
|
|
self.fail(
|
|
"We don't expect an outbound request to /state_ids in the happy path but if "
|
|
"the logic is sneaking around what we expect, make sure to fail the test. "
|
|
"We don't expect it because the signature failure should cause us to backoff "
|
|
"and not asking about pulled_event_without_signatures="
|
|
f"{pulled_event_without_signatures.event_id} again"
|
|
)
|
|
|
|
if room_state_endpoint_requested_count > 0:
|
|
self.fail(
|
|
"We don't expect an outbound request to /state in the happy path but if "
|
|
"the logic is sneaking around what we expect, make sure to fail the test. "
|
|
"We don't expect it because the signature failure should cause us to backoff "
|
|
"and not asking about pulled_event_without_signatures="
|
|
f"{pulled_event_without_signatures.event_id} again"
|
|
)
|
|
|
|
# Make sure we only recorded a single failure which corresponds to the signature
|
|
# failure initially in `_check_sigs_and_hash_for_pulled_events_and_fetch` before
|
|
# we process all of the pulled events.
|
|
backfill_num_attempts_for_event_without_signatures = self.get_success(
|
|
main_store.db_pool.simple_select_one_onecol(
|
|
table="event_failed_pull_attempts",
|
|
keyvalues={"event_id": pulled_event_without_signatures.event_id},
|
|
retcol="num_attempts",
|
|
)
|
|
)
|
|
self.assertEqual(backfill_num_attempts_for_event_without_signatures, 1)
|
|
|
|
# And make sure we didn't record a failure for the event that has the missing
|
|
# prev_event because we don't want to cause a cascade of failures. Not being
|
|
# able to fetch the `prev_events` just means we won't be able to de-outlier the
|
|
# pulled event. But we can still use an `outlier` in the state/auth chain for
|
|
# another event. So we shouldn't stop a downstream event from trying to pull it.
|
|
self.get_failure(
|
|
main_store.db_pool.simple_select_one_onecol(
|
|
table="event_failed_pull_attempts",
|
|
keyvalues={"event_id": pulled_event.event_id},
|
|
retcol="num_attempts",
|
|
),
|
|
# StoreError: 404: No row found
|
|
StoreError,
|
|
)
|
|
|
|
def test_backfill_process_previously_failed_pull_attempt_event_in_the_background(
|
|
self,
|
|
) -> None:
|
|
"""
|
|
Sanity check that events are still processed even if it is in the background
|
|
for events that already have failed pull attempts.
|
|
"""
|
|
OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
|
|
main_store = self.hs.get_datastores().main
|
|
|
|
# Create the room
|
|
user_id = self.register_user("kermit", "test")
|
|
tok = self.login("kermit", "test")
|
|
room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
|
|
room_version = self.get_success(main_store.get_room_version(room_id))
|
|
|
|
# Allow the remote user to send state events
|
|
self.helper.send_state(
|
|
room_id,
|
|
"m.room.power_levels",
|
|
{"events_default": 0, "state_default": 0},
|
|
tok=tok,
|
|
)
|
|
|
|
# Add the remote user to the room
|
|
member_event = self.get_success(
|
|
event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
|
|
)
|
|
|
|
initial_state_map = self.get_success(
|
|
main_store.get_partial_current_state_ids(room_id)
|
|
)
|
|
|
|
auth_event_ids = [
|
|
initial_state_map[("m.room.create", "")],
|
|
initial_state_map[("m.room.power_levels", "")],
|
|
member_event.event_id,
|
|
]
|
|
|
|
# Create a regular event that should process
|
|
pulled_event = make_event_from_dict(
|
|
self.add_hashes_and_signatures_from_other_server(
|
|
{
|
|
"type": "test_regular_type",
|
|
"room_id": room_id,
|
|
"sender": OTHER_USER,
|
|
"prev_events": [
|
|
member_event.event_id,
|
|
],
|
|
"auth_events": auth_event_ids,
|
|
"origin_server_ts": 1,
|
|
"depth": 12,
|
|
"content": {"body": "pulled_event"},
|
|
}
|
|
),
|
|
room_version,
|
|
)
|
|
|
|
# Record a failed pull attempt for this event which will cause us to backfill it
|
|
# in the background from here on out.
|
|
self.get_success(
|
|
main_store.record_event_failed_pull_attempt(
|
|
room_id, pulled_event.event_id, "fake cause"
|
|
)
|
|
)
|
|
|
|
# We expect an outbound request to /backfill, so stub that out
|
|
self.mock_federation_transport_client.backfill.return_value = {
|
|
"origin": self.OTHER_SERVER_NAME,
|
|
"origin_server_ts": 123,
|
|
"pdus": [
|
|
pulled_event.get_pdu_json(),
|
|
],
|
|
}
|
|
|
|
# The function under test: try to backfill and process the pulled event
|
|
with LoggingContext("test"):
|
|
self.get_success(
|
|
self.hs.get_federation_event_handler().backfill(
|
|
self.OTHER_SERVER_NAME,
|
|
room_id,
|
|
limit=1,
|
|
extremities=["$some_extremity"],
|
|
)
|
|
)
|
|
|
|
# Ensure `run_as_background_process(...)` has a chance to run (essentially
|
|
# `wait_for_background_processes()`)
|
|
self.reactor.pump((0.1,))
|
|
|
|
# Make sure we processed and persisted the pulled event
|
|
self.get_success(main_store.get_event(pulled_event.event_id, allow_none=False))
|
|
|
|
def test_process_pulled_event_with_rejected_missing_state(self) -> None:
|
|
"""Ensure that we correctly handle pulled events with missing state containing a
|
|
rejected state event
|
|
|
|
In this test, we pretend we are processing a "pulled" event (eg, via backfill
|
|
or get_missing_events). The pulled event has a prev_event we haven't previously
|
|
seen, so the server requests the state at that prev_event. We expect the server
|
|
to make a /state request.
|
|
|
|
We simulate a remote server whose /state includes a rejected kick event for a
|
|
local user. Notably, the kick event is rejected only because it cites a rejected
|
|
auth event and would otherwise be accepted based on the room state. During state
|
|
resolution, we re-run auth and can potentially introduce such rejected events
|
|
into the state if we are not careful.
|
|
|
|
We check that the pulled event is correctly persisted, and that the state
|
|
afterwards does not include the rejected kick.
|
|
"""
|
|
# The DAG we are testing looks like:
|
|
#
|
|
# ...
|
|
# |
|
|
# v
|
|
# remote admin user joins
|
|
# | |
|
|
# +-------+ +-------+
|
|
# | |
|
|
# | rejected power levels
|
|
# | from remote server
|
|
# | |
|
|
# | v
|
|
# | rejected kick of local user
|
|
# v from remote server
|
|
# new power levels |
|
|
# | v
|
|
# | missing event
|
|
# | from remote server
|
|
# | |
|
|
# +-------+ +-------+
|
|
# | |
|
|
# v v
|
|
# pulled event
|
|
# from remote server
|
|
#
|
|
# (arrows are in the opposite direction to prev_events.)
|
|
|
|
OTHER_USER = f"@user:{self.OTHER_SERVER_NAME}"
|
|
main_store = self.hs.get_datastores().main
|
|
|
|
# Create the room.
|
|
kermit_user_id = self.register_user("kermit", "test")
|
|
kermit_tok = self.login("kermit", "test")
|
|
room_id = self.helper.create_room_as(
|
|
room_creator=kermit_user_id, tok=kermit_tok
|
|
)
|
|
room_version = self.get_success(main_store.get_room_version(room_id))
|
|
|
|
# Add another local user to the room. This user is going to be kicked in a
|
|
# rejected event.
|
|
bert_user_id = self.register_user("bert", "test")
|
|
bert_tok = self.login("bert", "test")
|
|
self.helper.join(room_id, user=bert_user_id, tok=bert_tok)
|
|
|
|
# Allow the remote user to kick bert.
|
|
# The remote user is going to send a rejected power levels event later on and we
|
|
# need state resolution to order it before another power levels event kermit is
|
|
# going to send later on. Hence we give both users the same power level, so that
|
|
# ties are broken by `origin_server_ts`.
|
|
self.helper.send_state(
|
|
room_id,
|
|
"m.room.power_levels",
|
|
{"users": {kermit_user_id: 100, OTHER_USER: 100}},
|
|
tok=kermit_tok,
|
|
)
|
|
|
|
# Add the remote user to the room.
|
|
other_member_event = self.get_success(
|
|
event_injection.inject_member_event(self.hs, room_id, OTHER_USER, "join")
|
|
)
|
|
|
|
initial_state_map = self.get_success(
|
|
main_store.get_partial_current_state_ids(room_id)
|
|
)
|
|
create_event = self.get_success(
|
|
main_store.get_event(initial_state_map[("m.room.create", "")])
|
|
)
|
|
bert_member_event = self.get_success(
|
|
main_store.get_event(initial_state_map[("m.room.member", bert_user_id)])
|
|
)
|
|
power_levels_event = self.get_success(
|
|
main_store.get_event(initial_state_map[("m.room.power_levels", "")])
|
|
)
|
|
|
|
# We now need a rejected state event that will fail
|
|
# `check_state_independent_auth_rules` but pass
|
|
# `check_state_dependent_auth_rules`.
|
|
|
|
# First, we create a power levels event that we pretend the remote server has
|
|
# accepted, but the local homeserver will reject.
|
|
next_depth = 100
|
|
next_timestamp = other_member_event.origin_server_ts + 100
|
|
rejected_power_levels_event = make_event_from_dict(
|
|
self.add_hashes_and_signatures_from_other_server(
|
|
{
|
|
"type": "m.room.power_levels",
|
|
"state_key": "",
|
|
"room_id": room_id,
|
|
"sender": OTHER_USER,
|
|
"prev_events": [other_member_event.event_id],
|
|
"auth_events": [
|
|
initial_state_map[("m.room.create", "")],
|
|
initial_state_map[("m.room.power_levels", "")],
|
|
# The event will be rejected because of the duplicated auth
|
|
# event.
|
|
other_member_event.event_id,
|
|
other_member_event.event_id,
|
|
],
|
|
"origin_server_ts": next_timestamp,
|
|
"depth": next_depth,
|
|
"content": power_levels_event.content,
|
|
}
|
|
),
|
|
room_version,
|
|
)
|
|
next_depth += 1
|
|
next_timestamp += 100
|
|
|
|
with LoggingContext("send_rejected_power_levels_event"):
|
|
self.get_success(
|
|
self.hs.get_federation_event_handler()._process_pulled_event(
|
|
self.OTHER_SERVER_NAME,
|
|
rejected_power_levels_event,
|
|
backfilled=False,
|
|
)
|
|
)
|
|
self.assertEqual(
|
|
self.get_success(
|
|
main_store.get_rejection_reason(
|
|
rejected_power_levels_event.event_id
|
|
)
|
|
),
|
|
"auth_error",
|
|
)
|
|
|
|
# Then we create a kick event for a local user that cites the rejected power
|
|
# levels event in its auth events. The kick event will be rejected solely
|
|
# because of the rejected auth event and would otherwise be accepted.
|
|
rejected_kick_event = make_event_from_dict(
|
|
self.add_hashes_and_signatures_from_other_server(
|
|
{
|
|
"type": "m.room.member",
|
|
"state_key": bert_user_id,
|
|
"room_id": room_id,
|
|
"sender": OTHER_USER,
|
|
"prev_events": [rejected_power_levels_event.event_id],
|
|
"auth_events": [
|
|
initial_state_map[("m.room.create", "")],
|
|
rejected_power_levels_event.event_id,
|
|
initial_state_map[("m.room.member", bert_user_id)],
|
|
initial_state_map[("m.room.member", OTHER_USER)],
|
|
],
|
|
"origin_server_ts": next_timestamp,
|
|
"depth": next_depth,
|
|
"content": {"membership": "leave"},
|
|
}
|
|
),
|
|
room_version,
|
|
)
|
|
next_depth += 1
|
|
next_timestamp += 100
|
|
|
|
# The kick event must fail the state-independent auth rules, but pass the
|
|
# state-dependent auth rules, so that it has a chance of making it through state
|
|
# resolution.
|
|
self.get_failure(
|
|
check_state_independent_auth_rules(main_store, rejected_kick_event),
|
|
AuthError,
|
|
)
|
|
check_state_dependent_auth_rules(
|
|
rejected_kick_event,
|
|
[create_event, power_levels_event, other_member_event, bert_member_event],
|
|
)
|
|
|
|
# The kick event must also win over the original member event during state
|
|
# resolution.
|
|
self.assertEqual(
|
|
self.get_success(
|
|
_mainline_sort(
|
|
self.clock,
|
|
room_id,
|
|
event_ids=[
|
|
bert_member_event.event_id,
|
|
rejected_kick_event.event_id,
|
|
],
|
|
resolved_power_event_id=power_levels_event.event_id,
|
|
event_map={
|
|
bert_member_event.event_id: bert_member_event,
|
|
rejected_kick_event.event_id: rejected_kick_event,
|
|
},
|
|
state_res_store=StateResolutionStore(main_store),
|
|
)
|
|
),
|
|
[bert_member_event.event_id, rejected_kick_event.event_id],
|
|
"The rejected kick event will not be applied after bert's join event "
|
|
"during state resolution. The test setup is incorrect.",
|
|
)
|
|
|
|
with LoggingContext("send_rejected_kick_event"):
|
|
self.get_success(
|
|
self.hs.get_federation_event_handler()._process_pulled_event(
|
|
self.OTHER_SERVER_NAME, rejected_kick_event, backfilled=False
|
|
)
|
|
)
|
|
self.assertEqual(
|
|
self.get_success(
|
|
main_store.get_rejection_reason(rejected_kick_event.event_id)
|
|
),
|
|
"auth_error",
|
|
)
|
|
|
|
# We need another power levels event which will win over the rejected one during
|
|
# state resolution, otherwise we hit other issues where we end up with rejected
|
|
# a power levels event during state resolution.
|
|
self.reactor.advance(100) # ensure the `origin_server_ts` is larger
|
|
new_power_levels_event = self.get_success(
|
|
main_store.get_event(
|
|
self.helper.send_state(
|
|
room_id,
|
|
"m.room.power_levels",
|
|
{"users": {kermit_user_id: 100, OTHER_USER: 100, bert_user_id: 1}},
|
|
tok=kermit_tok,
|
|
)["event_id"]
|
|
)
|
|
)
|
|
self.assertEqual(
|
|
self.get_success(
|
|
_reverse_topological_power_sort(
|
|
self.clock,
|
|
room_id,
|
|
event_ids=[
|
|
new_power_levels_event.event_id,
|
|
rejected_power_levels_event.event_id,
|
|
],
|
|
event_map={},
|
|
state_res_store=StateResolutionStore(main_store),
|
|
full_conflicted_set=set(),
|
|
)
|
|
),
|
|
[rejected_power_levels_event.event_id, new_power_levels_event.event_id],
|
|
"The power levels events will not have the desired ordering during state "
|
|
"resolution. The test setup is incorrect.",
|
|
)
|
|
|
|
# Create a missing event, so that the local homeserver has to do a `/state` or
|
|
# `/state_ids` request to pull state from the remote homeserver.
|
|
missing_event = make_event_from_dict(
|
|
self.add_hashes_and_signatures_from_other_server(
|
|
{
|
|
"type": "m.room.message",
|
|
"room_id": room_id,
|
|
"sender": OTHER_USER,
|
|
"prev_events": [rejected_kick_event.event_id],
|
|
"auth_events": [
|
|
initial_state_map[("m.room.create", "")],
|
|
initial_state_map[("m.room.power_levels", "")],
|
|
initial_state_map[("m.room.member", OTHER_USER)],
|
|
],
|
|
"origin_server_ts": next_timestamp,
|
|
"depth": next_depth,
|
|
"content": {"msgtype": "m.text", "body": "foo"},
|
|
}
|
|
),
|
|
room_version,
|
|
)
|
|
next_depth += 1
|
|
next_timestamp += 100
|
|
|
|
# The pulled event has two prev events, one of which is missing. We will make a
|
|
# `/state` or `/state_ids` request to the remote homeserver to ask it for the
|
|
# state before the missing prev event.
|
|
pulled_event = make_event_from_dict(
|
|
self.add_hashes_and_signatures_from_other_server(
|
|
{
|
|
"type": "m.room.message",
|
|
"room_id": room_id,
|
|
"sender": OTHER_USER,
|
|
"prev_events": [
|
|
new_power_levels_event.event_id,
|
|
missing_event.event_id,
|
|
],
|
|
"auth_events": [
|
|
initial_state_map[("m.room.create", "")],
|
|
new_power_levels_event.event_id,
|
|
initial_state_map[("m.room.member", OTHER_USER)],
|
|
],
|
|
"origin_server_ts": next_timestamp,
|
|
"depth": next_depth,
|
|
"content": {"msgtype": "m.text", "body": "bar"},
|
|
}
|
|
),
|
|
room_version,
|
|
)
|
|
next_depth += 1
|
|
next_timestamp += 100
|
|
|
|
# Prepare the response for the `/state` or `/state_ids` request.
|
|
# The remote server believes bert has been kicked, while the local server does
|
|
# not.
|
|
state_before_missing_event = self.get_success(
|
|
main_store.get_events_as_list(initial_state_map.values())
|
|
)
|
|
state_before_missing_event = [
|
|
event
|
|
for event in state_before_missing_event
|
|
if event.event_id != bert_member_event.event_id
|
|
]
|
|
state_before_missing_event.append(rejected_kick_event)
|
|
|
|
# We have to bump the clock a bit, to keep the retry logic in
|
|
# `FederationClient.get_pdu` happy
|
|
self.reactor.advance(60000)
|
|
with LoggingContext("send_pulled_event"):
|
|
|
|
async def get_event(
|
|
destination: str, event_id: str, timeout: Optional[int] = None
|
|
) -> JsonDict:
|
|
self.assertEqual(destination, self.OTHER_SERVER_NAME)
|
|
self.assertEqual(event_id, missing_event.event_id)
|
|
return {"pdus": [missing_event.get_pdu_json()]}
|
|
|
|
async def get_room_state_ids(
|
|
destination: str, room_id: str, event_id: str
|
|
) -> JsonDict:
|
|
self.assertEqual(destination, self.OTHER_SERVER_NAME)
|
|
self.assertEqual(event_id, missing_event.event_id)
|
|
return {
|
|
"pdu_ids": [event.event_id for event in state_before_missing_event],
|
|
"auth_chain_ids": [],
|
|
}
|
|
|
|
async def get_room_state(
|
|
room_version: RoomVersion, destination: str, room_id: str, event_id: str
|
|
) -> StateRequestResponse:
|
|
self.assertEqual(destination, self.OTHER_SERVER_NAME)
|
|
self.assertEqual(event_id, missing_event.event_id)
|
|
return StateRequestResponse(
|
|
state=state_before_missing_event,
|
|
auth_events=[],
|
|
)
|
|
|
|
self.mock_federation_transport_client.get_event.side_effect = get_event
|
|
self.mock_federation_transport_client.get_room_state_ids.side_effect = (
|
|
get_room_state_ids
|
|
)
|
|
self.mock_federation_transport_client.get_room_state.side_effect = (
|
|
get_room_state
|
|
)
|
|
|
|
self.get_success(
|
|
self.hs.get_federation_event_handler()._process_pulled_event(
|
|
self.OTHER_SERVER_NAME, pulled_event, backfilled=False
|
|
)
|
|
)
|
|
self.assertIsNone(
|
|
self.get_success(
|
|
main_store.get_rejection_reason(pulled_event.event_id)
|
|
),
|
|
"Pulled event was unexpectedly rejected, likely due to a problem with "
|
|
"the test setup.",
|
|
)
|
|
self.assertEqual(
|
|
{pulled_event.event_id},
|
|
self.get_success(
|
|
main_store.have_events_in_timeline([pulled_event.event_id])
|
|
),
|
|
"Pulled event was not persisted, likely due to a problem with the test "
|
|
"setup.",
|
|
)
|
|
|
|
# We must not accept rejected events into the room state, so we expect bert
|
|
# to not be kicked, even if the remote server believes so.
|
|
new_state_map = self.get_success(
|
|
main_store.get_partial_current_state_ids(room_id)
|
|
)
|
|
self.assertEqual(
|
|
new_state_map[("m.room.member", bert_user_id)],
|
|
bert_member_event.event_id,
|
|
"Rejected kick event unexpectedly became part of room state.",
|
|
)
|