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synapse/tests/handlers/test_federation.py
Erik Johnston 52af16c561
Add a short sleep if the request is rate-limited (#17210) 
This helps prevent clients from "tight-looping" retrying their request.
2024-05-18 12:03:30 +01:00

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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
from typing import Collection, Optional, cast
from unittest import TestCase
from unittest.mock import AsyncMock, Mock, patch
from twisted.internet.defer import Deferred
from twisted.test.proto_helpers import MemoryReactor
from synapse.api.constants import EventTypes
from synapse.api.errors import (
AuthError,
Codes,
LimitExceededError,
NotFoundError,
SynapseError,
)
from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase, make_event_from_dict
from synapse.federation.federation_base import event_from_pdu_json
from synapse.federation.federation_client import SendJoinResult
from synapse.logging.context import LoggingContext, run_in_background
from synapse.rest import admin
from synapse.rest.client import login, room
from synapse.server import HomeServer
from synapse.storage.databases.main.events_worker import EventCacheEntry
from synapse.util import Clock
from synapse.util.stringutils import random_string
from tests import unittest
from tests.test_utils import event_injection
logger = logging.getLogger(__name__)
def generate_fake_event_id() -> str:
return "$fake_" + random_string(43)
class FederationTestCase(unittest.FederatingHomeserverTestCase):
servlets = [
admin.register_servlets,
login.register_servlets,
room.register_servlets,
]
def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
hs = self.setup_test_homeserver()
self.handler = hs.get_federation_handler()
self.store = hs.get_datastores().main
return hs
def test_exchange_revoked_invite(self) -> None:
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)
# Send a 3PID invite event with an empty body so it's considered as a revoked one.
invite_token = "sometoken"
self.helper.send_state(
room_id=room_id,
event_type=EventTypes.ThirdPartyInvite,
state_key=invite_token,
body={},
tok=tok,
)
d = self.handler.on_exchange_third_party_invite_request(
event_dict={
"type": EventTypes.Member,
"room_id": room_id,
"sender": user_id,
"state_key": "@someone:example.org",
"content": {
"membership": "invite",
"third_party_invite": {
"display_name": "alice",
"signed": {
"mxid": "@alice:localhost",
"token": invite_token,
"signatures": {
"magic.forest": {
"ed25519:3": "fQpGIW1Snz+pwLZu6sTy2aHy/DYWWTspTJRPyNp0PKkymfIsNffysMl6ObMMFdIJhk6g6pwlIqZ54rxo8SLmAg"
}
},
},
},
},
},
)
failure = self.get_failure(d, AuthError).value
self.assertEqual(failure.code, 403, failure)
self.assertEqual(failure.errcode, Codes.FORBIDDEN, failure)
self.assertEqual(failure.msg, "You are not invited to this room.")
def test_rejected_message_event_state(self) -> None:
"""
Check that we store the state group correctly for rejected non-state events.
Regression test for https://github.com/matrix-org/synapse/issues/6289.
"""
OTHER_SERVER = "otherserver"
OTHER_USER = "@otheruser:" + OTHER_SERVER
# 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(self.store.get_room_version(room_id))
# pretend that another server has joined
join_event = self._build_and_send_join_event(OTHER_SERVER, OTHER_USER, room_id)
# check the state group
sg = self.get_success(
self.store._get_state_group_for_event(join_event.event_id)
)
# build and send an event which will be rejected
ev = event_from_pdu_json(
{
"type": EventTypes.Message,
"content": {},
"room_id": room_id,
"sender": "@yetanotheruser:" + OTHER_SERVER,
"depth": cast(int, join_event["depth"]) + 1,
"prev_events": [join_event.event_id],
"auth_events": [],
"origin_server_ts": self.clock.time_msec(),
},
room_version,
)
with LoggingContext("send_rejected"):
d = run_in_background(
self.hs.get_federation_event_handler().on_receive_pdu, OTHER_SERVER, ev
)
self.get_success(d)
# that should have been rejected
e = self.get_success(self.store.get_event(ev.event_id, allow_rejected=True))
self.assertIsNotNone(e.rejected_reason)
# ... and the state group should be the same as before
sg2 = self.get_success(self.store._get_state_group_for_event(ev.event_id))
self.assertEqual(sg, sg2)
def test_rejected_state_event_state(self) -> None:
"""
Check that we store the state group correctly for rejected state events.
Regression test for https://github.com/matrix-org/synapse/issues/6289.
"""
OTHER_SERVER = "otherserver"
OTHER_USER = "@otheruser:" + OTHER_SERVER
# 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(self.store.get_room_version(room_id))
# pretend that another server has joined
join_event = self._build_and_send_join_event(OTHER_SERVER, OTHER_USER, room_id)
# check the state group
sg = self.get_success(
self.store._get_state_group_for_event(join_event.event_id)
)
# build and send an event which will be rejected
ev = event_from_pdu_json(
{
"type": "org.matrix.test",
"state_key": "test_key",
"content": {},
"room_id": room_id,
"sender": "@yetanotheruser:" + OTHER_SERVER,
"depth": cast(int, join_event["depth"]) + 1,
"prev_events": [join_event.event_id],
"auth_events": [],
"origin_server_ts": self.clock.time_msec(),
},
room_version,
)
with LoggingContext("send_rejected"):
d = run_in_background(
self.hs.get_federation_event_handler().on_receive_pdu, OTHER_SERVER, ev
)
self.get_success(d)
# that should have been rejected
e = self.get_success(self.store.get_event(ev.event_id, allow_rejected=True))
self.assertIsNotNone(e.rejected_reason)
# ... and the state group should be the same as before
sg2 = self.get_success(self.store._get_state_group_for_event(ev.event_id))
self.assertEqual(sg, sg2)
def test_backfill_with_many_backward_extremities(self) -> None:
"""
Check that we can backfill with many backward extremities.
The goal is to make sure that when we only use a portion
of backwards extremities(the magic number is more than 5),
no errors are thrown.
Regression test, see https://github.com/matrix-org/synapse/pull/11027
"""
# 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(self.store.get_room_version(room_id))
# we need a user on the remote server to be a member, so that we can send
# extremity-causing events.
remote_server_user_id = f"@user:{self.OTHER_SERVER_NAME}"
self.get_success(
event_injection.inject_member_event(
self.hs, room_id, remote_server_user_id, "join"
)
)
send_result = self.helper.send(room_id, "first message", tok=tok)
ev1 = self.get_success(
self.store.get_event(send_result["event_id"], allow_none=False)
)
current_state = self.get_success(
self.store.get_events_as_list(
(
self.get_success(self.store.get_partial_current_state_ids(room_id))
).values()
)
)
# Create "many" backward extremities. The magic number we're trying to
# create more than is 5 which corresponds to the number of backward
# extremities we slice off in `_maybe_backfill_inner`
federation_event_handler = self.hs.get_federation_event_handler()
auth_events = [
ev
for ev in current_state
if (ev.type, ev.state_key)
in {("m.room.create", ""), ("m.room.member", remote_server_user_id)}
]
for _ in range(8):
event = make_event_from_dict(
self.add_hashes_and_signatures_from_other_server(
{
"origin_server_ts": 1,
"type": "m.room.message",
"content": {
"msgtype": "m.text",
"body": "message connected to fake event",
},
"room_id": room_id,
"sender": remote_server_user_id,
"prev_events": [
ev1.event_id,
# We're creating an backward extremity each time thanks
# to this fake event
generate_fake_event_id(),
],
"auth_events": [ev.event_id for ev in auth_events],
"depth": ev1.depth + 1,
},
room_version,
),
room_version,
)
# we poke this directly into _process_received_pdu, to avoid the
# federation handler wanting to backfill the fake event.
state_handler = self.hs.get_state_handler()
context = self.get_success(
state_handler.compute_event_context(
event,
state_ids_before_event={
(e.type, e.state_key): e.event_id for e in current_state
},
partial_state=False,
)
)
self.get_success(
federation_event_handler._process_received_pdu(
self.OTHER_SERVER_NAME,
event,
context,
)
)
# we should now have 8 backwards extremities.
backwards_extremities = self.get_success(
self.store.db_pool.simple_select_list(
"event_backward_extremities",
keyvalues={"room_id": room_id},
retcols=["event_id"],
)
)
self.assertEqual(len(backwards_extremities), 8)
current_depth = 1
limit = 100
with LoggingContext("receive_pdu"):
# Make sure backfill still works
d = run_in_background(
self.hs.get_federation_handler().maybe_backfill,
room_id,
current_depth,
limit,
)
self.get_success(d)
def test_backfill_ignores_known_events(self) -> None:
"""
Tests that events that we already know about are ignored when backfilling.
"""
# Set up users
user_id = self.register_user("kermit", "test")
tok = self.login("kermit", "test")
other_server = "otherserver"
other_user = "@otheruser:" + other_server
# Create a room to backfill events into
room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
room_version = self.get_success(self.store.get_room_version(room_id))
# Build an event to backfill
event = event_from_pdu_json(
{
"type": EventTypes.Message,
"content": {"body": "hello world", "msgtype": "m.text"},
"room_id": room_id,
"sender": other_user,
"depth": 32,
"prev_events": [],
"auth_events": [],
"origin_server_ts": self.clock.time_msec(),
},
room_version,
)
# Ensure the event is not already in the DB
self.get_failure(
self.store.get_event(event.event_id),
NotFoundError,
)
# Backfill the event and check that it has entered the DB.
# We mock out the FederationClient.backfill method, to pretend that a remote
# server has returned our fake event.
federation_client_backfill_mock = AsyncMock(return_value=[event])
self.hs.get_federation_client().backfill = federation_client_backfill_mock # type: ignore[method-assign]
# We also mock the persist method with a side effect of itself. This allows us
# to track when it has been called while preserving its function.
persist_events_and_notify_mock = Mock(
side_effect=self.hs.get_federation_event_handler().persist_events_and_notify
)
self.hs.get_federation_event_handler().persist_events_and_notify = ( # type: ignore[method-assign]
persist_events_and_notify_mock
)
# Small side-tangent. We populate the event cache with the event, even though
# it is not yet in the DB. This is an invalid scenario that can currently occur
# due to not properly invalidating the event cache.
# See https://github.com/matrix-org/synapse/issues/13476.
#
# As a result, backfill should not rely on the event cache to check whether
# we already have an event in the DB.
# TODO: Remove this bit when the event cache is properly invalidated.
cache_entry = EventCacheEntry(
event=event,
redacted_event=None,
)
self.store._get_event_cache.set_local((event.event_id,), cache_entry)
# We now call FederationEventHandler.backfill (a separate method) to trigger
# a backfill request. It should receive the fake event.
self.get_success(
self.hs.get_federation_event_handler().backfill(
other_user,
room_id,
limit=10,
extremities=[],
)
)
# Check that our fake event was persisted.
persist_events_and_notify_mock.assert_called_once()
persist_events_and_notify_mock.reset_mock()
# Now we repeat the backfill, having the homeserver receive the fake event
# again.
self.get_success(
self.hs.get_federation_event_handler().backfill(
other_user,
room_id,
limit=10,
extremities=[],
),
)
# This time, we expect no event persistence to have occurred, as we already
# have this event.
persist_events_and_notify_mock.assert_not_called()
@unittest.override_config(
{"rc_invites": {"per_user": {"per_second": 0.5, "burst_count": 3}}}
)
def test_invite_by_user_ratelimit(self) -> None:
"""Tests that invites from federation to a particular user are
actually rate-limited.
"""
other_server = "otherserver"
other_user = "@otheruser:" + other_server
# create the room
user_id = self.register_user("kermit", "test")
tok = self.login("kermit", "test")
def create_invite() -> EventBase:
room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
room_version = self.get_success(self.store.get_room_version(room_id))
return event_from_pdu_json(
{
"type": EventTypes.Member,
"content": {"membership": "invite"},
"room_id": room_id,
"sender": other_user,
"state_key": "@user:test",
"depth": 32,
"prev_events": [],
"auth_events": [],
"origin_server_ts": self.clock.time_msec(),
},
room_version,
)
for _ in range(3):
event = create_invite()
self.get_success(
self.handler.on_invite_request(
other_server,
event,
event.room_version,
)
)
event = create_invite()
self.get_failure(
self.handler.on_invite_request(
other_server,
event,
event.room_version,
),
exc=LimitExceededError,
by=0.5,
)
def _build_and_send_join_event(
self, other_server: str, other_user: str, room_id: str
) -> EventBase:
join_event = self.get_success(
self.handler.on_make_join_request(other_server, room_id, other_user)
)
# the auth code requires that a signature exists, but doesn't check that
# signature... go figure.
join_event.signatures[other_server] = {"x": "y"}
with LoggingContext("send_join"):
d = run_in_background(
self.hs.get_federation_event_handler().on_send_membership_event,
other_server,
join_event,
)
self.get_success(d)
# sanity-check: the room should show that the new user is a member
r = self.get_success(self.store.get_partial_current_state_ids(room_id))
self.assertEqual(r[(EventTypes.Member, other_user)], join_event.event_id)
return join_event
class EventFromPduTestCase(TestCase):
def test_valid_json(self) -> None:
"""Valid JSON should be turned into an event."""
ev = event_from_pdu_json(
{
"type": EventTypes.Message,
"content": {"bool": True, "null": None, "int": 1, "str": "foobar"},
"room_id": "!room:test",
"sender": "@user:test",
"depth": 1,
"prev_events": [],
"auth_events": [],
"origin_server_ts": 1234,
},
RoomVersions.V6,
)
self.assertIsInstance(ev, EventBase)
def test_invalid_numbers(self) -> None:
"""Invalid values for an integer should be rejected, all floats should be rejected."""
for value in [
-(2**53),
2**53,
1.0,
float("inf"),
float("-inf"),
float("nan"),
]:
with self.assertRaises(SynapseError):
event_from_pdu_json(
{
"type": EventTypes.Message,
"content": {"foo": value},
"room_id": "!room:test",
"sender": "@user:test",
"depth": 1,
"prev_events": [],
"auth_events": [],
"origin_server_ts": 1234,
},
RoomVersions.V6,
)
def test_invalid_nested(self) -> None:
"""List and dictionaries are recursively searched."""
with self.assertRaises(SynapseError):
event_from_pdu_json(
{
"type": EventTypes.Message,
"content": {"foo": [{"bar": 2**56}]},
"room_id": "!room:test",
"sender": "@user:test",
"depth": 1,
"prev_events": [],
"auth_events": [],
"origin_server_ts": 1234,
},
RoomVersions.V6,
)
class PartialJoinTestCase(unittest.FederatingHomeserverTestCase):
def test_failed_partial_join_is_clean(self) -> None:
"""
Tests that, when failing to partial-join a room, we don't get stuck with
a partial-state flag on a room.
"""
fed_handler = self.hs.get_federation_handler()
fed_client = fed_handler.federation_client
room_id = "!room:example.com"
EVENT_CREATE = make_event_from_dict(
{
"room_id": room_id,
"type": "m.room.create",
"sender": "@kristina:example.com",
"state_key": "",
"depth": 0,
"content": {"creator": "@kristina:example.com", "room_version": "10"},
"auth_events": [],
"origin_server_ts": 1,
},
room_version=RoomVersions.V10,
)
EVENT_CREATOR_MEMBERSHIP = make_event_from_dict(
{
"room_id": room_id,
"type": "m.room.member",
"sender": "@kristina:example.com",
"state_key": "@kristina:example.com",
"content": {"membership": "join"},
"depth": 1,
"prev_events": [EVENT_CREATE.event_id],
"auth_events": [EVENT_CREATE.event_id],
"origin_server_ts": 1,
},
room_version=RoomVersions.V10,
)
EVENT_INVITATION_MEMBERSHIP = make_event_from_dict(
{
"room_id": room_id,
"type": "m.room.member",
"sender": "@kristina:example.com",
"state_key": "@alice:test",
"content": {"membership": "invite"},
"depth": 2,
"prev_events": [EVENT_CREATOR_MEMBERSHIP.event_id],
"auth_events": [
EVENT_CREATE.event_id,
EVENT_CREATOR_MEMBERSHIP.event_id,
],
"origin_server_ts": 1,
},
room_version=RoomVersions.V10,
)
membership_event = make_event_from_dict(
{
"room_id": room_id,
"type": "m.room.member",
"sender": "@alice:test",
"state_key": "@alice:test",
"content": {"membership": "join"},
"prev_events": [EVENT_INVITATION_MEMBERSHIP.event_id],
},
RoomVersions.V10,
)
mock_make_membership_event = AsyncMock(
return_value=(
"example.com",
membership_event,
RoomVersions.V10,
)
)
mock_send_join = AsyncMock(
return_value=SendJoinResult(
membership_event,
"example.com",
state=[
EVENT_CREATE,
EVENT_CREATOR_MEMBERSHIP,
EVENT_INVITATION_MEMBERSHIP,
],
auth_chain=[
EVENT_CREATE,
EVENT_CREATOR_MEMBERSHIP,
EVENT_INVITATION_MEMBERSHIP,
],
partial_state=True,
servers_in_room={"example.com"},
)
)
with patch.object(
fed_client, "make_membership_event", mock_make_membership_event
), patch.object(fed_client, "send_join", mock_send_join):
# Join and check that our join event is rejected
# (The join event is rejected because it doesn't have any signatures)
join_exc = self.get_failure(
fed_handler.do_invite_join(["example.com"], room_id, "@alice:test", {}),
SynapseError,
)
self.assertIn("Join event was rejected", str(join_exc))
store = self.hs.get_datastores().main
# Check that we don't have a left-over partial_state entry.
self.assertFalse(
self.get_success(store.is_partial_state_room(room_id)),
f"Stale partial-stated room flag left over for {room_id} after a"
f" failed do_invite_join!",
)
def test_duplicate_partial_state_room_syncs(self) -> None:
"""
Tests that concurrent partial state syncs are not started for the same room.
"""
is_partial_state = True
end_sync: "Deferred[None]" = Deferred()
async def is_partial_state_room(room_id: str) -> bool:
return is_partial_state
async def sync_partial_state_room(
initial_destination: Optional[str],
other_destinations: Collection[str],
room_id: str,
) -> None:
nonlocal end_sync
try:
await end_sync
finally:
end_sync = Deferred()
mock_is_partial_state_room = Mock(side_effect=is_partial_state_room)
mock_sync_partial_state_room = Mock(side_effect=sync_partial_state_room)
fed_handler = self.hs.get_federation_handler()
store = self.hs.get_datastores().main
with patch.object(
fed_handler, "_sync_partial_state_room", mock_sync_partial_state_room
), patch.object(store, "is_partial_state_room", mock_is_partial_state_room):
# Start the partial state sync.
fed_handler._start_partial_state_room_sync("hs1", {"hs2"}, "room_id")
self.assertEqual(mock_sync_partial_state_room.call_count, 1)
# Try to start another partial state sync.
# Nothing should happen.
fed_handler._start_partial_state_room_sync("hs3", {"hs2"}, "room_id")
self.assertEqual(mock_sync_partial_state_room.call_count, 1)
# End the partial state sync
is_partial_state = False
end_sync.callback(None)
# The partial state sync should not be restarted.
self.assertEqual(mock_sync_partial_state_room.call_count, 1)
# The next attempt to start the partial state sync should work.
is_partial_state = True
fed_handler._start_partial_state_room_sync("hs3", {"hs2"}, "room_id")
self.assertEqual(mock_sync_partial_state_room.call_count, 2)
def test_partial_state_room_sync_restart(self) -> None:
"""
Tests that partial state syncs are restarted when a second partial state sync
was deduplicated and the first partial state sync fails.
"""
is_partial_state = True
end_sync: "Deferred[None]" = Deferred()
async def is_partial_state_room(room_id: str) -> bool:
return is_partial_state
async def sync_partial_state_room(
initial_destination: Optional[str],
other_destinations: Collection[str],
room_id: str,
) -> None:
nonlocal end_sync
try:
await end_sync
finally:
end_sync = Deferred()
mock_is_partial_state_room = Mock(side_effect=is_partial_state_room)
mock_sync_partial_state_room = Mock(side_effect=sync_partial_state_room)
fed_handler = self.hs.get_federation_handler()
store = self.hs.get_datastores().main
with patch.object(
fed_handler, "_sync_partial_state_room", mock_sync_partial_state_room
), patch.object(store, "is_partial_state_room", mock_is_partial_state_room):
# Start the partial state sync.
fed_handler._start_partial_state_room_sync("hs1", {"hs2"}, "room_id")
self.assertEqual(mock_sync_partial_state_room.call_count, 1)
# Fail the partial state sync.
# The partial state sync should not be restarted.
end_sync.errback(Exception("Failed to request /state_ids"))
self.assertEqual(mock_sync_partial_state_room.call_count, 1)
# Start the partial state sync again.
fed_handler._start_partial_state_room_sync("hs1", {"hs2"}, "room_id")
self.assertEqual(mock_sync_partial_state_room.call_count, 2)
# Deduplicate another partial state sync.
fed_handler._start_partial_state_room_sync("hs3", {"hs2"}, "room_id")
self.assertEqual(mock_sync_partial_state_room.call_count, 2)
# Fail the partial state sync.
# It should restart with the latest parameters.
end_sync.errback(Exception("Failed to request /state_ids"))
self.assertEqual(mock_sync_partial_state_room.call_count, 3)
mock_sync_partial_state_room.assert_called_with(
initial_destination="hs3",
other_destinations={"hs2"},
room_id="room_id",
)
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