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428174f902
Broadly, the existing `event_auth.check` function has two parts: * a validation section: checks that the event isn't too big, that it has the rught signatures, etc. This bit is independent of the rest of the state in the room, and so need only be done once for each event. * an auth section: ensures that the event is allowed, given the rest of the state in the room. This gets done multiple times, against various sets of room state, because it forms part of the state res algorithm. Currently, this is implemented with `do_sig_check` and `do_size_check` parameters, but I think that makes everything hard to follow. Instead, we split the function in two and call each part separately where it is needed.
1535 lines
59 KiB
Python
1535 lines
59 KiB
Python
# Copyright 2014-2021 The Matrix.org Foundation C.I.C.
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# Copyright 2020 Sorunome
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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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"""Contains handlers for federation events."""
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import itertools
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import logging
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from http import HTTPStatus
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from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union
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from signedjson.key import decode_verify_key_bytes
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from signedjson.sign import verify_signed_json
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from unpaddedbase64 import decode_base64
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from twisted.internet import defer
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from synapse import event_auth
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from synapse.api.constants import EventTypes, Membership, RejectedReason
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from synapse.api.errors import (
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AuthError,
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CodeMessageException,
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Codes,
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FederationDeniedError,
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HttpResponseException,
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NotFoundError,
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RequestSendFailed,
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SynapseError,
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)
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion, RoomVersions
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from synapse.crypto.event_signing import compute_event_signature
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from synapse.event_auth import (
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check_auth_rules_for_event,
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validate_event_for_room_version,
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)
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from synapse.events import EventBase
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from synapse.events.snapshot import EventContext
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from synapse.events.validator import EventValidator
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from synapse.federation.federation_client import InvalidResponseError
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from synapse.handlers._base import BaseHandler
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from synapse.http.servlet import assert_params_in_dict
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from synapse.logging.context import (
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make_deferred_yieldable,
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nested_logging_context,
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preserve_fn,
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run_in_background,
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)
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from synapse.logging.utils import log_function
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from synapse.replication.http.federation import (
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ReplicationCleanRoomRestServlet,
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ReplicationStoreRoomOnOutlierMembershipRestServlet,
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)
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from synapse.storage.databases.main.events_worker import EventRedactBehaviour
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from synapse.types import JsonDict, StateMap, get_domain_from_id
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from synapse.util.async_helpers import Linearizer
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from synapse.util.retryutils import NotRetryingDestination
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from synapse.visibility import filter_events_for_server
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class FederationHandler(BaseHandler):
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"""Handles general incoming federation requests
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Incoming events are *not* handled here, for which see FederationEventHandler.
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"""
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def __init__(self, hs: "HomeServer"):
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super().__init__(hs)
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self.hs = hs
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self.store = hs.get_datastore()
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self.storage = hs.get_storage()
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self.state_store = self.storage.state
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self.federation_client = hs.get_federation_client()
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self.state_handler = hs.get_state_handler()
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self.server_name = hs.hostname
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self.keyring = hs.get_keyring()
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self.is_mine_id = hs.is_mine_id
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self.spam_checker = hs.get_spam_checker()
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self.event_creation_handler = hs.get_event_creation_handler()
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self._event_auth_handler = hs.get_event_auth_handler()
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self._server_notices_mxid = hs.config.servernotices.server_notices_mxid
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self.config = hs.config
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self.http_client = hs.get_proxied_blacklisted_http_client()
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self._replication = hs.get_replication_data_handler()
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self._federation_event_handler = hs.get_federation_event_handler()
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self._clean_room_for_join_client = ReplicationCleanRoomRestServlet.make_client(
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hs
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)
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if hs.config.worker.worker_app:
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self._maybe_store_room_on_outlier_membership = (
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ReplicationStoreRoomOnOutlierMembershipRestServlet.make_client(hs)
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)
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else:
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self._maybe_store_room_on_outlier_membership = (
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self.store.maybe_store_room_on_outlier_membership
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)
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self._room_backfill = Linearizer("room_backfill")
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self.third_party_event_rules = hs.get_third_party_event_rules()
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async def maybe_backfill(
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self, room_id: str, current_depth: int, limit: int
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) -> bool:
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"""Checks the database to see if we should backfill before paginating,
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and if so do.
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Args:
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room_id
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current_depth: The depth from which we're paginating from. This is
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used to decide if we should backfill and what extremities to
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use.
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limit: The number of events that the pagination request will
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return. This is used as part of the heuristic to decide if we
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should back paginate.
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"""
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with (await self._room_backfill.queue(room_id)):
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return await self._maybe_backfill_inner(room_id, current_depth, limit)
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async def _maybe_backfill_inner(
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self, room_id: str, current_depth: int, limit: int
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) -> bool:
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oldest_events_with_depth = (
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await self.store.get_oldest_event_ids_with_depth_in_room(room_id)
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)
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insertion_events_to_be_backfilled = (
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await self.store.get_insertion_event_backwards_extremities_in_room(room_id)
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)
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logger.debug(
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"_maybe_backfill_inner: extremities oldest_events_with_depth=%s insertion_events_to_be_backfilled=%s",
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oldest_events_with_depth,
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insertion_events_to_be_backfilled,
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)
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if not oldest_events_with_depth and not insertion_events_to_be_backfilled:
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logger.debug("Not backfilling as no extremeties found.")
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return False
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# We only want to paginate if we can actually see the events we'll get,
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# as otherwise we'll just spend a lot of resources to get redacted
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# events.
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#
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# We do this by filtering all the backwards extremities and seeing if
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# any remain. Given we don't have the extremity events themselves, we
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# need to actually check the events that reference them.
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#
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# *Note*: the spec wants us to keep backfilling until we reach the start
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# of the room in case we are allowed to see some of the history. However
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# in practice that causes more issues than its worth, as a) its
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# relatively rare for there to be any visible history and b) even when
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# there is its often sufficiently long ago that clients would stop
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# attempting to paginate before backfill reached the visible history.
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#
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# TODO: If we do do a backfill then we should filter the backwards
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# extremities to only include those that point to visible portions of
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# history.
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#
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# TODO: Correctly handle the case where we are allowed to see the
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# forward event but not the backward extremity, e.g. in the case of
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# initial join of the server where we are allowed to see the join
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# event but not anything before it. This would require looking at the
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# state *before* the event, ignoring the special casing certain event
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# types have.
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forward_event_ids = await self.store.get_successor_events(
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list(oldest_events_with_depth)
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)
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extremities_events = await self.store.get_events(
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forward_event_ids,
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redact_behaviour=EventRedactBehaviour.AS_IS,
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get_prev_content=False,
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)
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# We set `check_history_visibility_only` as we might otherwise get false
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# positives from users having been erased.
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filtered_extremities = await filter_events_for_server(
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self.storage,
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self.server_name,
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list(extremities_events.values()),
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redact=False,
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check_history_visibility_only=True,
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)
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logger.debug(
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"_maybe_backfill_inner: filtered_extremities %s", filtered_extremities
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)
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if not filtered_extremities and not insertion_events_to_be_backfilled:
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return False
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extremities = {
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**oldest_events_with_depth,
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# TODO: insertion_events_to_be_backfilled is currently skipping the filtered_extremities checks
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**insertion_events_to_be_backfilled,
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}
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# Check if we reached a point where we should start backfilling.
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sorted_extremeties_tuple = sorted(extremities.items(), key=lambda e: -int(e[1]))
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max_depth = sorted_extremeties_tuple[0][1]
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# If we're approaching an extremity we trigger a backfill, otherwise we
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# no-op.
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#
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# We chose twice the limit here as then clients paginating backwards
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# will send pagination requests that trigger backfill at least twice
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# using the most recent extremity before it gets removed (see below). We
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# chose more than one times the limit in case of failure, but choosing a
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# much larger factor will result in triggering a backfill request much
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# earlier than necessary.
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if current_depth - 2 * limit > max_depth:
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logger.debug(
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"Not backfilling as we don't need to. %d < %d - 2 * %d",
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max_depth,
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current_depth,
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limit,
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)
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return False
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logger.debug(
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"room_id: %s, backfill: current_depth: %s, max_depth: %s, extrems: %s",
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room_id,
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current_depth,
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max_depth,
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sorted_extremeties_tuple,
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)
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# We ignore extremities that have a greater depth than our current depth
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# as:
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# 1. we don't really care about getting events that have happened
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# before our current position; and
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# 2. we have likely previously tried and failed to backfill from that
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# extremity, so to avoid getting "stuck" requesting the same
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# backfill repeatedly we drop those extremities.
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filtered_sorted_extremeties_tuple = [
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t for t in sorted_extremeties_tuple if int(t[1]) <= current_depth
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]
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# However, we need to check that the filtered extremities are non-empty.
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# If they are empty then either we can a) bail or b) still attempt to
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# backill. We opt to try backfilling anyway just in case we do get
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# relevant events.
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if filtered_sorted_extremeties_tuple:
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sorted_extremeties_tuple = filtered_sorted_extremeties_tuple
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# We don't want to specify too many extremities as it causes the backfill
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# request URI to be too long.
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extremities = dict(sorted_extremeties_tuple[:5])
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# Now we need to decide which hosts to hit first.
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# First we try hosts that are already in the room
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# TODO: HEURISTIC ALERT.
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curr_state = await self.state_handler.get_current_state(room_id)
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def get_domains_from_state(state: StateMap[EventBase]) -> List[Tuple[str, int]]:
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"""Get joined domains from state
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Args:
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state: State map from type/state key to event.
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Returns:
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Returns a list of servers with the lowest depth of their joins.
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Sorted by lowest depth first.
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"""
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joined_users = [
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(state_key, int(event.depth))
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for (e_type, state_key), event in state.items()
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if e_type == EventTypes.Member and event.membership == Membership.JOIN
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]
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joined_domains: Dict[str, int] = {}
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for u, d in joined_users:
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try:
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dom = get_domain_from_id(u)
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old_d = joined_domains.get(dom)
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if old_d:
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joined_domains[dom] = min(d, old_d)
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else:
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joined_domains[dom] = d
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except Exception:
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pass
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return sorted(joined_domains.items(), key=lambda d: d[1])
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curr_domains = get_domains_from_state(curr_state)
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likely_domains = [
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domain for domain, depth in curr_domains if domain != self.server_name
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]
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async def try_backfill(domains: List[str]) -> bool:
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# TODO: Should we try multiple of these at a time?
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for dom in domains:
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try:
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await self._federation_event_handler.backfill(
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dom, room_id, limit=100, extremities=extremities
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)
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# If this succeeded then we probably already have the
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# appropriate stuff.
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# TODO: We can probably do something more intelligent here.
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return True
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except (SynapseError, InvalidResponseError) as e:
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logger.info("Failed to backfill from %s because %s", dom, e)
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continue
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except HttpResponseException as e:
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if 400 <= e.code < 500:
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raise e.to_synapse_error()
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logger.info("Failed to backfill from %s because %s", dom, e)
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continue
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except CodeMessageException as e:
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if 400 <= e.code < 500:
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raise
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logger.info("Failed to backfill from %s because %s", dom, e)
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continue
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except NotRetryingDestination as e:
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logger.info(str(e))
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continue
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except RequestSendFailed as e:
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logger.info("Failed to get backfill from %s because %s", dom, e)
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continue
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except FederationDeniedError as e:
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logger.info(e)
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continue
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except Exception as e:
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logger.exception("Failed to backfill from %s because %s", dom, e)
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continue
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return False
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success = await try_backfill(likely_domains)
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if success:
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return True
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# Huh, well *those* domains didn't work out. Lets try some domains
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# from the time.
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tried_domains = set(likely_domains)
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tried_domains.add(self.server_name)
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event_ids = list(extremities.keys())
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logger.debug("calling resolve_state_groups in _maybe_backfill")
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resolve = preserve_fn(self.state_handler.resolve_state_groups_for_events)
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states = await make_deferred_yieldable(
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defer.gatherResults(
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[resolve(room_id, [e]) for e in event_ids], consumeErrors=True
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)
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)
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# dict[str, dict[tuple, str]], a map from event_id to state map of
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# event_ids.
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states = dict(zip(event_ids, [s.state for s in states]))
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state_map = await self.store.get_events(
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[e_id for ids in states.values() for e_id in ids.values()],
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get_prev_content=False,
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)
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states = {
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key: {
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k: state_map[e_id]
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for k, e_id in state_dict.items()
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if e_id in state_map
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}
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for key, state_dict in states.items()
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}
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for e_id, _ in sorted_extremeties_tuple:
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likely_extremeties_domains = get_domains_from_state(states[e_id])
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success = await try_backfill(
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[
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dom
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for dom, _ in likely_extremeties_domains
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if dom not in tried_domains
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]
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)
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if success:
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return True
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tried_domains.update(dom for dom, _ in likely_extremeties_domains)
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return False
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async def send_invite(self, target_host: str, event: EventBase) -> EventBase:
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"""Sends the invite to the remote server for signing.
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Invites must be signed by the invitee's server before distribution.
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"""
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try:
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pdu = await self.federation_client.send_invite(
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destination=target_host,
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room_id=event.room_id,
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event_id=event.event_id,
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pdu=event,
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)
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except RequestSendFailed:
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raise SynapseError(502, f"Can't connect to server {target_host}")
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return pdu
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async def on_event_auth(self, event_id: str) -> List[EventBase]:
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event = await self.store.get_event(event_id)
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auth = await self.store.get_auth_chain(
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event.room_id, list(event.auth_event_ids()), include_given=True
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)
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return list(auth)
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async def do_invite_join(
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self, target_hosts: Iterable[str], room_id: str, joinee: str, content: JsonDict
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) -> Tuple[str, int]:
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"""Attempts to join the `joinee` to the room `room_id` via the
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servers contained in `target_hosts`.
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This first triggers a /make_join/ request that returns a partial
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event that we can fill out and sign. This is then sent to the
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remote server via /send_join/ which responds with the state at that
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event and the auth_chains.
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We suspend processing of any received events from this room until we
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have finished processing the join.
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|
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Args:
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target_hosts: List of servers to attempt to join the room with.
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room_id: The ID of the room to join.
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joinee: The User ID of the joining user.
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content: The event content to use for the join event.
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"""
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# TODO: We should be able to call this on workers, but the upgrading of
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# room stuff after join currently doesn't work on workers.
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assert self.config.worker.worker_app is None
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logger.debug("Joining %s to %s", joinee, room_id)
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origin, event, room_version_obj = await self._make_and_verify_event(
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target_hosts,
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room_id,
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joinee,
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"join",
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content,
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params={"ver": KNOWN_ROOM_VERSIONS},
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)
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# This shouldn't happen, because the RoomMemberHandler has a
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# linearizer lock which only allows one operation per user per room
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# at a time - so this is just paranoia.
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assert room_id not in self._federation_event_handler.room_queues
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self._federation_event_handler.room_queues[room_id] = []
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await self._clean_room_for_join(room_id)
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try:
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# Try the host we successfully got a response to /make_join/
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# request first.
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host_list = list(target_hosts)
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try:
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host_list.remove(origin)
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host_list.insert(0, origin)
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except ValueError:
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pass
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ret = await self.federation_client.send_join(
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host_list, event, room_version_obj
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)
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event = ret.event
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origin = ret.origin
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|
state = ret.state
|
|
auth_chain = ret.auth_chain
|
|
auth_chain.sort(key=lambda e: e.depth)
|
|
|
|
logger.debug("do_invite_join auth_chain: %s", auth_chain)
|
|
logger.debug("do_invite_join state: %s", state)
|
|
|
|
logger.debug("do_invite_join event: %s", event)
|
|
|
|
# if this is the first time we've joined this room, it's time to add
|
|
# a row to `rooms` with the correct room version. If there's already a
|
|
# row there, we should override it, since it may have been populated
|
|
# based on an invite request which lied about the room version.
|
|
#
|
|
# federation_client.send_join has already checked that the room
|
|
# version in the received create event is the same as room_version_obj,
|
|
# so we can rely on it now.
|
|
#
|
|
await self.store.upsert_room_on_join(
|
|
room_id=room_id,
|
|
room_version=room_version_obj,
|
|
auth_events=auth_chain,
|
|
)
|
|
|
|
max_stream_id = await self._persist_auth_tree(
|
|
origin, room_id, auth_chain, state, event, room_version_obj
|
|
)
|
|
|
|
# We wait here until this instance has seen the events come down
|
|
# replication (if we're using replication) as the below uses caches.
|
|
await self._replication.wait_for_stream_position(
|
|
self.config.worker.events_shard_config.get_instance(room_id),
|
|
"events",
|
|
max_stream_id,
|
|
)
|
|
|
|
# Check whether this room is the result of an upgrade of a room we already know
|
|
# about. If so, migrate over user information
|
|
predecessor = await self.store.get_room_predecessor(room_id)
|
|
if not predecessor or not isinstance(predecessor.get("room_id"), str):
|
|
return event.event_id, max_stream_id
|
|
old_room_id = predecessor["room_id"]
|
|
logger.debug(
|
|
"Found predecessor for %s during remote join: %s", room_id, old_room_id
|
|
)
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
await member_handler.transfer_room_state_on_room_upgrade(
|
|
old_room_id, room_id
|
|
)
|
|
|
|
logger.debug("Finished joining %s to %s", joinee, room_id)
|
|
return event.event_id, max_stream_id
|
|
finally:
|
|
room_queue = self._federation_event_handler.room_queues[room_id]
|
|
del self._federation_event_handler.room_queues[room_id]
|
|
|
|
# we don't need to wait for the queued events to be processed -
|
|
# it's just a best-effort thing at this point. We do want to do
|
|
# them roughly in order, though, otherwise we'll end up making
|
|
# lots of requests for missing prev_events which we do actually
|
|
# have. Hence we fire off the background task, but don't wait for it.
|
|
|
|
run_in_background(self._handle_queued_pdus, room_queue)
|
|
|
|
@log_function
|
|
async def do_knock(
|
|
self,
|
|
target_hosts: List[str],
|
|
room_id: str,
|
|
knockee: str,
|
|
content: JsonDict,
|
|
) -> Tuple[str, int]:
|
|
"""Sends the knock to the remote server.
|
|
|
|
This first triggers a make_knock request that returns a partial
|
|
event that we can fill out and sign. This is then sent to the
|
|
remote server via send_knock.
|
|
|
|
Knock events must be signed by the knockee's server before distributing.
|
|
|
|
Args:
|
|
target_hosts: A list of hosts that we want to try knocking through.
|
|
room_id: The ID of the room to knock on.
|
|
knockee: The ID of the user who is knocking.
|
|
content: The content of the knock event.
|
|
|
|
Returns:
|
|
A tuple of (event ID, stream ID).
|
|
|
|
Raises:
|
|
SynapseError: If the chosen remote server returns a 3xx/4xx code.
|
|
RuntimeError: If no servers were reachable.
|
|
"""
|
|
logger.debug("Knocking on room %s on behalf of user %s", room_id, knockee)
|
|
|
|
# Inform the remote server of the room versions we support
|
|
supported_room_versions = list(KNOWN_ROOM_VERSIONS.keys())
|
|
|
|
# Ask the remote server to create a valid knock event for us. Once received,
|
|
# we sign the event
|
|
params: Dict[str, Iterable[str]] = {"ver": supported_room_versions}
|
|
origin, event, event_format_version = await self._make_and_verify_event(
|
|
target_hosts, room_id, knockee, Membership.KNOCK, content, params=params
|
|
)
|
|
|
|
# Mark the knock as an outlier as we don't yet have the state at this point in
|
|
# the DAG.
|
|
event.internal_metadata.outlier = True
|
|
|
|
# ... but tell /sync to send it to clients anyway.
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
# Record the room ID and its version so that we have a record of the room
|
|
await self._maybe_store_room_on_outlier_membership(
|
|
room_id=event.room_id, room_version=event_format_version
|
|
)
|
|
|
|
# Initially try the host that we successfully called /make_knock on
|
|
try:
|
|
target_hosts.remove(origin)
|
|
target_hosts.insert(0, origin)
|
|
except ValueError:
|
|
pass
|
|
|
|
# Send the signed event back to the room, and potentially receive some
|
|
# further information about the room in the form of partial state events
|
|
stripped_room_state = await self.federation_client.send_knock(
|
|
target_hosts, event
|
|
)
|
|
|
|
# Store any stripped room state events in the "unsigned" key of the event.
|
|
# This is a bit of a hack and is cribbing off of invites. Basically we
|
|
# store the room state here and retrieve it again when this event appears
|
|
# in the invitee's sync stream. It is stripped out for all other local users.
|
|
event.unsigned["knock_room_state"] = stripped_room_state["knock_state_events"]
|
|
|
|
context = EventContext.for_outlier()
|
|
stream_id = await self._federation_event_handler.persist_events_and_notify(
|
|
event.room_id, [(event, context)]
|
|
)
|
|
return event.event_id, stream_id
|
|
|
|
async def _handle_queued_pdus(
|
|
self, room_queue: List[Tuple[EventBase, str]]
|
|
) -> None:
|
|
"""Process PDUs which got queued up while we were busy send_joining.
|
|
|
|
Args:
|
|
room_queue: list of PDUs to be processed and the servers that sent them
|
|
"""
|
|
for p, origin in room_queue:
|
|
try:
|
|
logger.info(
|
|
"Processing queued PDU %s which was received while we were joining",
|
|
p,
|
|
)
|
|
with nested_logging_context(p.event_id):
|
|
await self._federation_event_handler.on_receive_pdu(origin, p)
|
|
except Exception as e:
|
|
logger.warning(
|
|
"Error handling queued PDU %s from %s: %s", p.event_id, origin, e
|
|
)
|
|
|
|
async def on_make_join_request(
|
|
self, origin: str, room_id: str, user_id: str
|
|
) -> EventBase:
|
|
"""We've received a /make_join/ request, so we create a partial
|
|
join event for the room and return that. We do *not* persist or
|
|
process it until the other server has signed it and sent it back.
|
|
|
|
Args:
|
|
origin: The (verified) server name of the requesting server.
|
|
room_id: Room to create join event in
|
|
user_id: The user to create the join for
|
|
"""
|
|
if get_domain_from_id(user_id) != origin:
|
|
logger.info(
|
|
"Got /make_join request for user %r from different origin %s, ignoring",
|
|
user_id,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
# checking the room version will check that we've actually heard of the room
|
|
# (and return a 404 otherwise)
|
|
room_version = await self.store.get_room_version(room_id)
|
|
|
|
# now check that we are *still* in the room
|
|
is_in_room = await self._event_auth_handler.check_host_in_room(
|
|
room_id, self.server_name
|
|
)
|
|
if not is_in_room:
|
|
logger.info(
|
|
"Got /make_join request for room %s we are no longer in",
|
|
room_id,
|
|
)
|
|
raise NotFoundError("Not an active room on this server")
|
|
|
|
event_content = {"membership": Membership.JOIN}
|
|
|
|
# If the current room is using restricted join rules, additional information
|
|
# may need to be included in the event content in order to efficiently
|
|
# validate the event.
|
|
#
|
|
# Note that this requires the /send_join request to come back to the
|
|
# same server.
|
|
if room_version.msc3083_join_rules:
|
|
state_ids = await self.store.get_current_state_ids(room_id)
|
|
if await self._event_auth_handler.has_restricted_join_rules(
|
|
state_ids, room_version
|
|
):
|
|
prev_member_event_id = state_ids.get((EventTypes.Member, user_id), None)
|
|
# If the user is invited or joined to the room already, then
|
|
# no additional info is needed.
|
|
include_auth_user_id = True
|
|
if prev_member_event_id:
|
|
prev_member_event = await self.store.get_event(prev_member_event_id)
|
|
include_auth_user_id = prev_member_event.membership not in (
|
|
Membership.JOIN,
|
|
Membership.INVITE,
|
|
)
|
|
|
|
if include_auth_user_id:
|
|
event_content[
|
|
"join_authorised_via_users_server"
|
|
] = await self._event_auth_handler.get_user_which_could_invite(
|
|
room_id,
|
|
state_ids,
|
|
)
|
|
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": event_content,
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
try:
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
except SynapseError as e:
|
|
logger.warning("Failed to create join to %s because %s", room_id, e)
|
|
raise
|
|
|
|
# Ensure the user can even join the room.
|
|
await self._federation_event_handler.check_join_restrictions(context, event)
|
|
|
|
# The remote hasn't signed it yet, obviously. We'll do the full checks
|
|
# when we get the event back in `on_send_join_request`
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version, event, context
|
|
)
|
|
return event
|
|
|
|
async def on_invite_request(
|
|
self, origin: str, event: EventBase, room_version: RoomVersion
|
|
) -> EventBase:
|
|
"""We've got an invite event. Process and persist it. Sign it.
|
|
|
|
Respond with the now signed event.
|
|
"""
|
|
if event.state_key is None:
|
|
raise SynapseError(400, "The invite event did not have a state key")
|
|
|
|
is_blocked = await self.store.is_room_blocked(event.room_id)
|
|
if is_blocked:
|
|
raise SynapseError(403, "This room has been blocked on this server")
|
|
|
|
if self.hs.config.server.block_non_admin_invites:
|
|
raise SynapseError(403, "This server does not accept room invites")
|
|
|
|
if not await self.spam_checker.user_may_invite(
|
|
event.sender, event.state_key, event.room_id
|
|
):
|
|
raise SynapseError(
|
|
403, "This user is not permitted to send invites to this server/user"
|
|
)
|
|
|
|
membership = event.content.get("membership")
|
|
if event.type != EventTypes.Member or membership != Membership.INVITE:
|
|
raise SynapseError(400, "The event was not an m.room.member invite event")
|
|
|
|
sender_domain = get_domain_from_id(event.sender)
|
|
if sender_domain != origin:
|
|
raise SynapseError(
|
|
400, "The invite event was not from the server sending it"
|
|
)
|
|
|
|
if not self.is_mine_id(event.state_key):
|
|
raise SynapseError(400, "The invite event must be for this server")
|
|
|
|
# block any attempts to invite the server notices mxid
|
|
if event.state_key == self._server_notices_mxid:
|
|
raise SynapseError(HTTPStatus.FORBIDDEN, "Cannot invite this user")
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
# We don't rate limit based on room ID, as that should be done by
|
|
# sending server.
|
|
await member_handler.ratelimit_invite(None, None, event.state_key)
|
|
|
|
# keep a record of the room version, if we don't yet know it.
|
|
# (this may get overwritten if we later get a different room version in a
|
|
# join dance).
|
|
await self._maybe_store_room_on_outlier_membership(
|
|
room_id=event.room_id, room_version=room_version
|
|
)
|
|
|
|
event.internal_metadata.outlier = True
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
room_version,
|
|
event.get_pdu_json(),
|
|
self.hs.hostname,
|
|
self.hs.signing_key,
|
|
)
|
|
)
|
|
|
|
context = EventContext.for_outlier()
|
|
await self._federation_event_handler.persist_events_and_notify(
|
|
event.room_id, [(event, context)]
|
|
)
|
|
|
|
return event
|
|
|
|
async def do_remotely_reject_invite(
|
|
self, target_hosts: Iterable[str], room_id: str, user_id: str, content: JsonDict
|
|
) -> Tuple[EventBase, int]:
|
|
origin, event, room_version = await self._make_and_verify_event(
|
|
target_hosts, room_id, user_id, "leave", content=content
|
|
)
|
|
# Mark as outlier as we don't have any state for this event; we're not
|
|
# even in the room.
|
|
event.internal_metadata.outlier = True
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
# Try the host that we successfully called /make_leave/ on first for
|
|
# the /send_leave/ request.
|
|
host_list = list(target_hosts)
|
|
try:
|
|
host_list.remove(origin)
|
|
host_list.insert(0, origin)
|
|
except ValueError:
|
|
pass
|
|
|
|
await self.federation_client.send_leave(host_list, event)
|
|
|
|
context = EventContext.for_outlier()
|
|
stream_id = await self._federation_event_handler.persist_events_and_notify(
|
|
event.room_id, [(event, context)]
|
|
)
|
|
|
|
return event, stream_id
|
|
|
|
async def _make_and_verify_event(
|
|
self,
|
|
target_hosts: Iterable[str],
|
|
room_id: str,
|
|
user_id: str,
|
|
membership: str,
|
|
content: JsonDict,
|
|
params: Optional[Dict[str, Union[str, Iterable[str]]]] = None,
|
|
) -> Tuple[str, EventBase, RoomVersion]:
|
|
(
|
|
origin,
|
|
event,
|
|
room_version,
|
|
) = await self.federation_client.make_membership_event(
|
|
target_hosts, room_id, user_id, membership, content, params=params
|
|
)
|
|
|
|
logger.debug("Got response to make_%s: %s", membership, event)
|
|
|
|
# We should assert some things.
|
|
# FIXME: Do this in a nicer way
|
|
assert event.type == EventTypes.Member
|
|
assert event.user_id == user_id
|
|
assert event.state_key == user_id
|
|
assert event.room_id == room_id
|
|
return origin, event, room_version
|
|
|
|
async def on_make_leave_request(
|
|
self, origin: str, room_id: str, user_id: str
|
|
) -> EventBase:
|
|
"""We've received a /make_leave/ request, so we create a partial
|
|
leave event for the room and return that. We do *not* persist or
|
|
process it until the other server has signed it and sent it back.
|
|
|
|
Args:
|
|
origin: The (verified) server name of the requesting server.
|
|
room_id: Room to create leave event in
|
|
user_id: The user to create the leave for
|
|
"""
|
|
if get_domain_from_id(user_id) != origin:
|
|
logger.info(
|
|
"Got /make_leave request for user %r from different origin %s, ignoring",
|
|
user_id,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
room_version_obj = await self.store.get_room_version(room_id)
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": {"membership": Membership.LEAVE},
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
try:
|
|
# The remote hasn't signed it yet, obviously. We'll do the full checks
|
|
# when we get the event back in `on_send_leave_request`
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Failed to create new leave %r because %s", event, e)
|
|
raise e
|
|
|
|
return event
|
|
|
|
@log_function
|
|
async def on_make_knock_request(
|
|
self, origin: str, room_id: str, user_id: str
|
|
) -> EventBase:
|
|
"""We've received a make_knock request, so we create a partial
|
|
knock event for the room and return that. We do *not* persist or
|
|
process it until the other server has signed it and sent it back.
|
|
|
|
Args:
|
|
origin: The (verified) server name of the requesting server.
|
|
room_id: The room to create the knock event in.
|
|
user_id: The user to create the knock for.
|
|
|
|
Returns:
|
|
The partial knock event.
|
|
"""
|
|
if get_domain_from_id(user_id) != origin:
|
|
logger.info(
|
|
"Get /make_knock request for user %r from different origin %s, ignoring",
|
|
user_id,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
room_version_obj = await self.store.get_room_version(room_id)
|
|
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": {"membership": Membership.KNOCK},
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
event_allowed, _ = await self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.warning("Creation of knock %s forbidden by third-party rules", event)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
|
|
try:
|
|
# The remote hasn't signed it yet, obviously. We'll do the full checks
|
|
# when we get the event back in `on_send_knock_request`
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Failed to create new knock %r because %s", event, e)
|
|
raise e
|
|
|
|
return event
|
|
|
|
async def get_state_for_pdu(self, room_id: str, event_id: str) -> List[EventBase]:
|
|
"""Returns the state at the event. i.e. not including said event."""
|
|
|
|
event = await self.store.get_event(event_id, check_room_id=room_id)
|
|
|
|
state_groups = await self.state_store.get_state_groups(room_id, [event_id])
|
|
|
|
if state_groups:
|
|
_, state = list(state_groups.items()).pop()
|
|
results = {(e.type, e.state_key): e for e in state}
|
|
|
|
if event.is_state():
|
|
# Get previous state
|
|
if "replaces_state" in event.unsigned:
|
|
prev_id = event.unsigned["replaces_state"]
|
|
if prev_id != event.event_id:
|
|
prev_event = await self.store.get_event(prev_id)
|
|
results[(event.type, event.state_key)] = prev_event
|
|
else:
|
|
del results[(event.type, event.state_key)]
|
|
|
|
res = list(results.values())
|
|
return res
|
|
else:
|
|
return []
|
|
|
|
async def get_state_ids_for_pdu(self, room_id: str, event_id: str) -> List[str]:
|
|
"""Returns the state at the event. i.e. not including said event."""
|
|
event = await self.store.get_event(event_id, check_room_id=room_id)
|
|
|
|
state_groups = await self.state_store.get_state_groups_ids(room_id, [event_id])
|
|
|
|
if state_groups:
|
|
_, state = list(state_groups.items()).pop()
|
|
results = state
|
|
|
|
if event.is_state():
|
|
# Get previous state
|
|
if "replaces_state" in event.unsigned:
|
|
prev_id = event.unsigned["replaces_state"]
|
|
if prev_id != event.event_id:
|
|
results[(event.type, event.state_key)] = prev_id
|
|
else:
|
|
results.pop((event.type, event.state_key), None)
|
|
|
|
return list(results.values())
|
|
else:
|
|
return []
|
|
|
|
@log_function
|
|
async def on_backfill_request(
|
|
self, origin: str, room_id: str, pdu_list: List[str], limit: int
|
|
) -> List[EventBase]:
|
|
in_room = await self._event_auth_handler.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
# Synapse asks for 100 events per backfill request. Do not allow more.
|
|
limit = min(limit, 100)
|
|
|
|
events = await self.store.get_backfill_events(room_id, pdu_list, limit)
|
|
|
|
events = await filter_events_for_server(self.storage, origin, events)
|
|
|
|
return events
|
|
|
|
@log_function
|
|
async def get_persisted_pdu(
|
|
self, origin: str, event_id: str
|
|
) -> Optional[EventBase]:
|
|
"""Get an event from the database for the given server.
|
|
|
|
Args:
|
|
origin: hostname of server which is requesting the event; we
|
|
will check that the server is allowed to see it.
|
|
event_id: id of the event being requested
|
|
|
|
Returns:
|
|
None if we know nothing about the event; otherwise the (possibly-redacted) event.
|
|
|
|
Raises:
|
|
AuthError if the server is not currently in the room
|
|
"""
|
|
event = await self.store.get_event(
|
|
event_id, allow_none=True, allow_rejected=True
|
|
)
|
|
|
|
if event:
|
|
in_room = await self._event_auth_handler.check_host_in_room(
|
|
event.room_id, origin
|
|
)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
events = await filter_events_for_server(self.storage, origin, [event])
|
|
event = events[0]
|
|
return event
|
|
else:
|
|
return None
|
|
|
|
async def _persist_auth_tree(
|
|
self,
|
|
origin: str,
|
|
room_id: str,
|
|
auth_events: List[EventBase],
|
|
state: List[EventBase],
|
|
event: EventBase,
|
|
room_version: RoomVersion,
|
|
) -> int:
|
|
"""Checks the auth chain is valid (and passes auth checks) for the
|
|
state and event. Then persists the auth chain and state atomically.
|
|
Persists the event separately. Notifies about the persisted events
|
|
where appropriate.
|
|
|
|
Will attempt to fetch missing auth events.
|
|
|
|
Args:
|
|
origin: Where the events came from
|
|
room_id,
|
|
auth_events
|
|
state
|
|
event
|
|
room_version: The room version we expect this room to have, and
|
|
will raise if it doesn't match the version in the create event.
|
|
"""
|
|
events_to_context = {}
|
|
for e in itertools.chain(auth_events, state):
|
|
e.internal_metadata.outlier = True
|
|
events_to_context[e.event_id] = EventContext.for_outlier()
|
|
|
|
event_map = {
|
|
e.event_id: e for e in itertools.chain(auth_events, state, [event])
|
|
}
|
|
|
|
create_event = None
|
|
for e in auth_events:
|
|
if (e.type, e.state_key) == (EventTypes.Create, ""):
|
|
create_event = e
|
|
break
|
|
|
|
if create_event is None:
|
|
# If the state doesn't have a create event then the room is
|
|
# invalid, and it would fail auth checks anyway.
|
|
raise SynapseError(400, "No create event in state")
|
|
|
|
room_version_id = create_event.content.get(
|
|
"room_version", RoomVersions.V1.identifier
|
|
)
|
|
|
|
if room_version.identifier != room_version_id:
|
|
raise SynapseError(400, "Room version mismatch")
|
|
|
|
missing_auth_events = set()
|
|
for e in itertools.chain(auth_events, state, [event]):
|
|
for e_id in e.auth_event_ids():
|
|
if e_id not in event_map:
|
|
missing_auth_events.add(e_id)
|
|
|
|
for e_id in missing_auth_events:
|
|
m_ev = await self.federation_client.get_pdu(
|
|
[origin],
|
|
e_id,
|
|
room_version=room_version,
|
|
outlier=True,
|
|
timeout=10000,
|
|
)
|
|
if m_ev and m_ev.event_id == e_id:
|
|
event_map[e_id] = m_ev
|
|
else:
|
|
logger.info("Failed to find auth event %r", e_id)
|
|
|
|
for e in itertools.chain(auth_events, state, [event]):
|
|
auth_for_e = {
|
|
(event_map[e_id].type, event_map[e_id].state_key): event_map[e_id]
|
|
for e_id in e.auth_event_ids()
|
|
if e_id in event_map
|
|
}
|
|
if create_event:
|
|
auth_for_e[(EventTypes.Create, "")] = create_event
|
|
|
|
try:
|
|
validate_event_for_room_version(room_version, e)
|
|
check_auth_rules_for_event(room_version, e, auth_for_e)
|
|
except SynapseError as err:
|
|
# we may get SynapseErrors here as well as AuthErrors. For
|
|
# instance, there are a couple of (ancient) events in some
|
|
# rooms whose senders do not have the correct sigil; these
|
|
# cause SynapseErrors in auth.check. We don't want to give up
|
|
# the attempt to federate altogether in such cases.
|
|
|
|
logger.warning("Rejecting %s because %s", e.event_id, err.msg)
|
|
|
|
if e == event:
|
|
raise
|
|
events_to_context[e.event_id].rejected = RejectedReason.AUTH_ERROR
|
|
|
|
if auth_events or state:
|
|
await self._federation_event_handler.persist_events_and_notify(
|
|
room_id,
|
|
[
|
|
(e, events_to_context[e.event_id])
|
|
for e in itertools.chain(auth_events, state)
|
|
],
|
|
)
|
|
|
|
new_event_context = await self.state_handler.compute_event_context(
|
|
event, old_state=state
|
|
)
|
|
|
|
return await self._federation_event_handler.persist_events_and_notify(
|
|
room_id, [(event, new_event_context)]
|
|
)
|
|
|
|
async def on_get_missing_events(
|
|
self,
|
|
origin: str,
|
|
room_id: str,
|
|
earliest_events: List[str],
|
|
latest_events: List[str],
|
|
limit: int,
|
|
) -> List[EventBase]:
|
|
in_room = await self._event_auth_handler.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
# Only allow up to 20 events to be retrieved per request.
|
|
limit = min(limit, 20)
|
|
|
|
missing_events = await self.store.get_missing_events(
|
|
room_id=room_id,
|
|
earliest_events=earliest_events,
|
|
latest_events=latest_events,
|
|
limit=limit,
|
|
)
|
|
|
|
missing_events = await filter_events_for_server(
|
|
self.storage, origin, missing_events
|
|
)
|
|
|
|
return missing_events
|
|
|
|
@log_function
|
|
async def exchange_third_party_invite(
|
|
self, sender_user_id: str, target_user_id: str, room_id: str, signed: JsonDict
|
|
) -> None:
|
|
third_party_invite = {"signed": signed}
|
|
|
|
event_dict = {
|
|
"type": EventTypes.Member,
|
|
"content": {
|
|
"membership": Membership.INVITE,
|
|
"third_party_invite": third_party_invite,
|
|
},
|
|
"room_id": room_id,
|
|
"sender": sender_user_id,
|
|
"state_key": target_user_id,
|
|
}
|
|
|
|
if await self._event_auth_handler.check_host_in_room(room_id, self.hs.hostname):
|
|
room_version_obj = await self.store.get_room_version(room_id)
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj, event_dict
|
|
)
|
|
|
|
EventValidator().validate_builder(builder)
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
event, context = await self.add_display_name_to_third_party_invite(
|
|
room_version_obj, event_dict, event, context
|
|
)
|
|
|
|
EventValidator().validate_new(event, self.config)
|
|
|
|
# We need to tell the transaction queue to send this out, even
|
|
# though the sender isn't a local user.
|
|
event.internal_metadata.send_on_behalf_of = self.hs.hostname
|
|
|
|
try:
|
|
validate_event_for_room_version(room_version_obj, event)
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Denying new third party invite %r because %s", event, e)
|
|
raise e
|
|
|
|
await self._check_signature(event, context)
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
await member_handler.send_membership_event(None, event, context)
|
|
else:
|
|
destinations = {x.split(":", 1)[-1] for x in (sender_user_id, room_id)}
|
|
|
|
try:
|
|
await self.federation_client.forward_third_party_invite(
|
|
destinations, room_id, event_dict
|
|
)
|
|
except (RequestSendFailed, HttpResponseException):
|
|
raise SynapseError(502, "Failed to forward third party invite")
|
|
|
|
async def on_exchange_third_party_invite_request(
|
|
self, event_dict: JsonDict
|
|
) -> None:
|
|
"""Handle an exchange_third_party_invite request from a remote server
|
|
|
|
The remote server will call this when it wants to turn a 3pid invite
|
|
into a normal m.room.member invite.
|
|
|
|
Args:
|
|
event_dict: Dictionary containing the event body.
|
|
|
|
"""
|
|
assert_params_in_dict(event_dict, ["room_id"])
|
|
room_version_obj = await self.store.get_room_version(event_dict["room_id"])
|
|
|
|
# NB: event_dict has a particular specced format we might need to fudge
|
|
# if we change event formats too much.
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj, event_dict
|
|
)
|
|
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
event, context = await self.add_display_name_to_third_party_invite(
|
|
room_version_obj, event_dict, event, context
|
|
)
|
|
|
|
try:
|
|
validate_event_for_room_version(room_version_obj, event)
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Denying third party invite %r because %s", event, e)
|
|
raise e
|
|
await self._check_signature(event, context)
|
|
|
|
# We need to tell the transaction queue to send this out, even
|
|
# though the sender isn't a local user.
|
|
event.internal_metadata.send_on_behalf_of = get_domain_from_id(event.sender)
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
await member_handler.send_membership_event(None, event, context)
|
|
|
|
async def add_display_name_to_third_party_invite(
|
|
self,
|
|
room_version_obj: RoomVersion,
|
|
event_dict: JsonDict,
|
|
event: EventBase,
|
|
context: EventContext,
|
|
) -> Tuple[EventBase, EventContext]:
|
|
key = (
|
|
EventTypes.ThirdPartyInvite,
|
|
event.content["third_party_invite"]["signed"]["token"],
|
|
)
|
|
original_invite = None
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
original_invite_id = prev_state_ids.get(key)
|
|
if original_invite_id:
|
|
original_invite = await self.store.get_event(
|
|
original_invite_id, allow_none=True
|
|
)
|
|
if original_invite:
|
|
# If the m.room.third_party_invite event's content is empty, it means the
|
|
# invite has been revoked. In this case, we don't have to raise an error here
|
|
# because the auth check will fail on the invite (because it's not able to
|
|
# fetch public keys from the m.room.third_party_invite event's content, which
|
|
# is empty).
|
|
display_name = original_invite.content.get("display_name")
|
|
event_dict["content"]["third_party_invite"]["display_name"] = display_name
|
|
else:
|
|
logger.info(
|
|
"Could not find invite event for third_party_invite: %r", event_dict
|
|
)
|
|
# We don't discard here as this is not the appropriate place to do
|
|
# auth checks. If we need the invite and don't have it then the
|
|
# auth check code will explode appropriately.
|
|
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj, event_dict
|
|
)
|
|
EventValidator().validate_builder(builder)
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
EventValidator().validate_new(event, self.config)
|
|
return event, context
|
|
|
|
async def _check_signature(self, event: EventBase, context: EventContext) -> None:
|
|
"""
|
|
Checks that the signature in the event is consistent with its invite.
|
|
|
|
Args:
|
|
event: The m.room.member event to check
|
|
context:
|
|
|
|
Raises:
|
|
AuthError: if signature didn't match any keys, or key has been
|
|
revoked,
|
|
SynapseError: if a transient error meant a key couldn't be checked
|
|
for revocation.
|
|
"""
|
|
signed = event.content["third_party_invite"]["signed"]
|
|
token = signed["token"]
|
|
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
invite_event_id = prev_state_ids.get((EventTypes.ThirdPartyInvite, token))
|
|
|
|
invite_event = None
|
|
if invite_event_id:
|
|
invite_event = await self.store.get_event(invite_event_id, allow_none=True)
|
|
|
|
if not invite_event:
|
|
raise AuthError(403, "Could not find invite")
|
|
|
|
logger.debug("Checking auth on event %r", event.content)
|
|
|
|
last_exception: Optional[Exception] = None
|
|
|
|
# for each public key in the 3pid invite event
|
|
for public_key_object in event_auth.get_public_keys(invite_event):
|
|
try:
|
|
# for each sig on the third_party_invite block of the actual invite
|
|
for server, signature_block in signed["signatures"].items():
|
|
for key_name in signature_block.keys():
|
|
if not key_name.startswith("ed25519:"):
|
|
continue
|
|
|
|
logger.debug(
|
|
"Attempting to verify sig with key %s from %r "
|
|
"against pubkey %r",
|
|
key_name,
|
|
server,
|
|
public_key_object,
|
|
)
|
|
|
|
try:
|
|
public_key = public_key_object["public_key"]
|
|
verify_key = decode_verify_key_bytes(
|
|
key_name, decode_base64(public_key)
|
|
)
|
|
verify_signed_json(signed, server, verify_key)
|
|
logger.debug(
|
|
"Successfully verified sig with key %s from %r "
|
|
"against pubkey %r",
|
|
key_name,
|
|
server,
|
|
public_key_object,
|
|
)
|
|
except Exception:
|
|
logger.info(
|
|
"Failed to verify sig with key %s from %r "
|
|
"against pubkey %r",
|
|
key_name,
|
|
server,
|
|
public_key_object,
|
|
)
|
|
raise
|
|
try:
|
|
if "key_validity_url" in public_key_object:
|
|
await self._check_key_revocation(
|
|
public_key, public_key_object["key_validity_url"]
|
|
)
|
|
except Exception:
|
|
logger.info(
|
|
"Failed to query key_validity_url %s",
|
|
public_key_object["key_validity_url"],
|
|
)
|
|
raise
|
|
return
|
|
except Exception as e:
|
|
last_exception = e
|
|
|
|
if last_exception is None:
|
|
# we can only get here if get_public_keys() returned an empty list
|
|
# TODO: make this better
|
|
raise RuntimeError("no public key in invite event")
|
|
|
|
raise last_exception
|
|
|
|
async def _check_key_revocation(self, public_key: str, url: str) -> None:
|
|
"""
|
|
Checks whether public_key has been revoked.
|
|
|
|
Args:
|
|
public_key: base-64 encoded public key.
|
|
url: Key revocation URL.
|
|
|
|
Raises:
|
|
AuthError: if they key has been revoked.
|
|
SynapseError: if a transient error meant a key couldn't be checked
|
|
for revocation.
|
|
"""
|
|
try:
|
|
response = await self.http_client.get_json(url, {"public_key": public_key})
|
|
except Exception:
|
|
raise SynapseError(502, "Third party certificate could not be checked")
|
|
if "valid" not in response or not response["valid"]:
|
|
raise AuthError(403, "Third party certificate was invalid")
|
|
|
|
async def _clean_room_for_join(self, room_id: str) -> None:
|
|
"""Called to clean up any data in DB for a given room, ready for the
|
|
server to join the room.
|
|
|
|
Args:
|
|
room_id
|
|
"""
|
|
if self.config.worker.worker_app:
|
|
await self._clean_room_for_join_client(room_id)
|
|
else:
|
|
await self.store.clean_room_for_join(room_id)
|
|
|
|
async def get_room_complexity(
|
|
self, remote_room_hosts: List[str], room_id: str
|
|
) -> Optional[dict]:
|
|
"""
|
|
Fetch the complexity of a remote room over federation.
|
|
|
|
Args:
|
|
remote_room_hosts (list[str]): The remote servers to ask.
|
|
room_id (str): The room ID to ask about.
|
|
|
|
Returns:
|
|
Dict contains the complexity
|
|
metric versions, while None means we could not fetch the complexity.
|
|
"""
|
|
|
|
for host in remote_room_hosts:
|
|
res = await self.federation_client.get_room_complexity(host, room_id)
|
|
|
|
# We got a result, return it.
|
|
if res:
|
|
return res
|
|
|
|
# We fell off the bottom, couldn't get the complexity from anyone. Oh
|
|
# well.
|
|
return None
|