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54dd5dc12b
Implement part [MSC2228](https://github.com/matrix-org/matrix-doc/pull/2228). The parts that differ are: * the feature is hidden behind a configuration flag (`enable_ephemeral_messages`) * self-destruction doesn't happen for state events * only implement support for the `m.self_destruct_after` field (not the `m.self_destruct` one) * doesn't send synthetic redactions to clients because for this specific case we consider the clients to be able to destroy an event themselves, instead we just censor it (by pruning its JSON) in the database
2808 lines
107 KiB
Python
2808 lines
107 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2017-2018 New Vector Ltd
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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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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import six
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from six import iteritems, itervalues
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from six.moves import http_client, zip
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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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FederationError,
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RequestSendFailed,
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StoreError,
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SynapseError,
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)
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersions
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from synapse.crypto.event_signing import compute_event_signature
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from synapse.event_auth import auth_types_for_event
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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.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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ReplicationFederationSendEventsRestServlet,
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)
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from synapse.replication.http.membership import ReplicationUserJoinedLeftRoomRestServlet
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from synapse.state import StateResolutionStore, resolve_events_with_store
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from synapse.types import UserID, get_domain_from_id
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from synapse.util import unwrapFirstError
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from synapse.util.async_helpers import Linearizer
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from synapse.util.distributor import user_joined_room
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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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from ._base import BaseHandler
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logger = logging.getLogger(__name__)
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def shortstr(iterable, maxitems=5):
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"""If iterable has maxitems or fewer, return the stringification of a list
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containing those items.
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Otherwise, return the stringification of a a list with the first maxitems items,
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followed by "...".
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Args:
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iterable (Iterable): iterable to truncate
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maxitems (int): number of items to return before truncating
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Returns:
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unicode
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"""
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items = list(itertools.islice(iterable, maxitems + 1))
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if len(items) <= maxitems:
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return str(items)
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return "[" + ", ".join(repr(r) for r in items[:maxitems]) + ", ...]"
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class FederationHandler(BaseHandler):
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"""Handles events that originated from federation.
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Responsible for:
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a) handling received Pdus before handing them on as Events to the rest
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of the homeserver (including auth and state conflict resoultion)
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b) converting events that were produced by local clients that may need
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to be sent to remote homeservers.
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c) doing the necessary dances to invite remote users and join remote
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rooms.
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"""
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def __init__(self, hs):
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super(FederationHandler, self).__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.action_generator = hs.get_action_generator()
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self.is_mine_id = hs.is_mine_id
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self.pusher_pool = hs.get_pusherpool()
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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._message_handler = hs.get_message_handler()
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self._server_notices_mxid = hs.config.server_notices_mxid
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self.config = hs.config
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self.http_client = hs.get_simple_http_client()
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self._send_events_to_master = ReplicationFederationSendEventsRestServlet.make_client(
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hs
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)
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self._notify_user_membership_change = ReplicationUserJoinedLeftRoomRestServlet.make_client(
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hs
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)
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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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# When joining a room we need to queue any events for that room up
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self.room_queues = {}
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self._room_pdu_linearizer = Linearizer("fed_room_pdu")
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self.third_party_event_rules = hs.get_third_party_event_rules()
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self._ephemeral_messages_enabled = hs.config.enable_ephemeral_messages
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@defer.inlineCallbacks
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def on_receive_pdu(self, origin, pdu, sent_to_us_directly=False):
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""" Process a PDU received via a federation /send/ transaction, or
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via backfill of missing prev_events
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Args:
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origin (str): server which initiated the /send/ transaction. Will
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be used to fetch missing events or state.
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pdu (FrozenEvent): received PDU
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sent_to_us_directly (bool): True if this event was pushed to us; False if
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we pulled it as the result of a missing prev_event.
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Returns (Deferred): completes with None
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"""
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room_id = pdu.room_id
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event_id = pdu.event_id
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logger.info("[%s %s] handling received PDU: %s", room_id, event_id, pdu)
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# We reprocess pdus when we have seen them only as outliers
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existing = yield self.store.get_event(
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event_id, allow_none=True, allow_rejected=True
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)
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# FIXME: Currently we fetch an event again when we already have it
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# if it has been marked as an outlier.
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already_seen = existing and (
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not existing.internal_metadata.is_outlier()
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or pdu.internal_metadata.is_outlier()
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)
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if already_seen:
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logger.debug("[%s %s]: Already seen pdu", room_id, event_id)
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return
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# do some initial sanity-checking of the event. In particular, make
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# sure it doesn't have hundreds of prev_events or auth_events, which
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# could cause a huge state resolution or cascade of event fetches.
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try:
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self._sanity_check_event(pdu)
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except SynapseError as err:
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logger.warning(
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"[%s %s] Received event failed sanity checks", room_id, event_id
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)
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raise FederationError("ERROR", err.code, err.msg, affected=pdu.event_id)
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# If we are currently in the process of joining this room, then we
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# queue up events for later processing.
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if room_id in self.room_queues:
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logger.info(
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"[%s %s] Queuing PDU from %s for now: join in progress",
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room_id,
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event_id,
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origin,
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)
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self.room_queues[room_id].append((pdu, origin))
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return
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# If we're not in the room just ditch the event entirely. This is
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# probably an old server that has come back and thinks we're still in
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# the room (or we've been rejoined to the room by a state reset).
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#
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# Note that if we were never in the room then we would have already
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# dropped the event, since we wouldn't know the room version.
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is_in_room = yield self.auth.check_host_in_room(room_id, self.server_name)
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if not is_in_room:
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logger.info(
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"[%s %s] Ignoring PDU from %s as we're not in the room",
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room_id,
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event_id,
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origin,
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)
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return None
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state = None
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auth_chain = []
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# Get missing pdus if necessary.
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if not pdu.internal_metadata.is_outlier():
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# We only backfill backwards to the min depth.
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min_depth = yield self.get_min_depth_for_context(pdu.room_id)
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logger.debug("[%s %s] min_depth: %d", room_id, event_id, min_depth)
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prevs = set(pdu.prev_event_ids())
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seen = yield self.store.have_seen_events(prevs)
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if min_depth and pdu.depth < min_depth:
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# This is so that we don't notify the user about this
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# message, to work around the fact that some events will
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# reference really really old events we really don't want to
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# send to the clients.
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pdu.internal_metadata.outlier = True
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elif min_depth and pdu.depth > min_depth:
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missing_prevs = prevs - seen
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if sent_to_us_directly and missing_prevs:
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# If we're missing stuff, ensure we only fetch stuff one
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# at a time.
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logger.info(
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"[%s %s] Acquiring room lock to fetch %d missing prev_events: %s",
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room_id,
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event_id,
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len(missing_prevs),
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shortstr(missing_prevs),
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)
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with (yield self._room_pdu_linearizer.queue(pdu.room_id)):
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logger.info(
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"[%s %s] Acquired room lock to fetch %d missing prev_events",
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room_id,
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event_id,
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len(missing_prevs),
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)
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yield self._get_missing_events_for_pdu(
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origin, pdu, prevs, min_depth
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)
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# Update the set of things we've seen after trying to
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# fetch the missing stuff
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seen = yield self.store.have_seen_events(prevs)
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if not prevs - seen:
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logger.info(
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"[%s %s] Found all missing prev_events",
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room_id,
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event_id,
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)
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elif missing_prevs:
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logger.info(
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"[%s %s] Not recursively fetching %d missing prev_events: %s",
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room_id,
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event_id,
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len(missing_prevs),
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shortstr(missing_prevs),
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)
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if prevs - seen:
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# We've still not been able to get all of the prev_events for this event.
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#
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# In this case, we need to fall back to asking another server in the
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# federation for the state at this event. That's ok provided we then
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# resolve the state against other bits of the DAG before using it (which
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# will ensure that you can't just take over a room by sending an event,
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# withholding its prev_events, and declaring yourself to be an admin in
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# the subsequent state request).
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#
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# Now, if we're pulling this event as a missing prev_event, then clearly
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# this event is not going to become the only forward-extremity and we are
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# guaranteed to resolve its state against our existing forward
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# extremities, so that should be fine.
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#
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# On the other hand, if this event was pushed to us, it is possible for
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# it to become the only forward-extremity in the room, and we would then
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# trust its state to be the state for the whole room. This is very bad.
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# Further, if the event was pushed to us, there is no excuse for us not to
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# have all the prev_events. We therefore reject any such events.
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#
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# XXX this really feels like it could/should be merged with the above,
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# but there is an interaction with min_depth that I'm not really
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# following.
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if sent_to_us_directly:
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logger.warning(
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"[%s %s] Rejecting: failed to fetch %d prev events: %s",
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room_id,
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event_id,
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len(prevs - seen),
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shortstr(prevs - seen),
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)
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raise FederationError(
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"ERROR",
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403,
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(
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"Your server isn't divulging details about prev_events "
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"referenced in this event."
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),
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affected=pdu.event_id,
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)
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# Calculate the state after each of the previous events, and
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# resolve them to find the correct state at the current event.
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auth_chains = set()
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event_map = {event_id: pdu}
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try:
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# Get the state of the events we know about
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ours = yield self.state_store.get_state_groups_ids(room_id, seen)
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# state_maps is a list of mappings from (type, state_key) to event_id
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state_maps = list(
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ours.values()
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) # type: list[dict[tuple[str, str], str]]
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# we don't need this any more, let's delete it.
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del ours
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# Ask the remote server for the states we don't
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# know about
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for p in prevs - seen:
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logger.info(
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"[%s %s] Requesting state at missing prev_event %s",
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room_id,
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event_id,
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p,
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)
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room_version = yield self.store.get_room_version(room_id)
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with nested_logging_context(p):
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# note that if any of the missing prevs share missing state or
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# auth events, the requests to fetch those events are deduped
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# by the get_pdu_cache in federation_client.
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(
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remote_state,
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got_auth_chain,
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) = yield self.federation_client.get_state_for_room(
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origin, room_id, p
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)
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# we want the state *after* p; get_state_for_room returns the
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# state *before* p.
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remote_event = yield self.federation_client.get_pdu(
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[origin], p, room_version, outlier=True
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)
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if remote_event is None:
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raise Exception(
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"Unable to get missing prev_event %s" % (p,)
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)
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if remote_event.is_state():
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remote_state.append(remote_event)
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# XXX hrm I'm not convinced that duplicate events will compare
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# for equality, so I'm not sure this does what the author
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# hoped.
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auth_chains.update(got_auth_chain)
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remote_state_map = {
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(x.type, x.state_key): x.event_id for x in remote_state
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}
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state_maps.append(remote_state_map)
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for x in remote_state:
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event_map[x.event_id] = x
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state_map = yield resolve_events_with_store(
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room_version,
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state_maps,
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event_map,
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state_res_store=StateResolutionStore(self.store),
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)
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# We need to give _process_received_pdu the actual state events
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# rather than event ids, so generate that now.
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# First though we need to fetch all the events that are in
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# state_map, so we can build up the state below.
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evs = yield self.store.get_events(
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list(state_map.values()),
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get_prev_content=False,
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check_redacted=False,
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)
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event_map.update(evs)
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state = [event_map[e] for e in six.itervalues(state_map)]
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auth_chain = list(auth_chains)
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except Exception:
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logger.warning(
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"[%s %s] Error attempting to resolve state at missing "
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"prev_events",
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room_id,
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event_id,
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exc_info=True,
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)
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raise FederationError(
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"ERROR",
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403,
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"We can't get valid state history.",
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affected=event_id,
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)
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yield self._process_received_pdu(
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origin, pdu, state=state, auth_chain=auth_chain
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)
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@defer.inlineCallbacks
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def _get_missing_events_for_pdu(self, origin, pdu, prevs, min_depth):
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"""
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Args:
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origin (str): Origin of the pdu. Will be called to get the missing events
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pdu: received pdu
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prevs (set(str)): List of event ids which we are missing
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min_depth (int): Minimum depth of events to return.
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"""
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room_id = pdu.room_id
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event_id = pdu.event_id
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seen = yield self.store.have_seen_events(prevs)
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if not prevs - seen:
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return
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latest = yield self.store.get_latest_event_ids_in_room(room_id)
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# We add the prev events that we have seen to the latest
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# list to ensure the remote server doesn't give them to us
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latest = set(latest)
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latest |= seen
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logger.info(
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"[%s %s]: Requesting missing events between %s and %s",
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room_id,
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event_id,
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shortstr(latest),
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event_id,
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)
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# XXX: we set timeout to 10s to help workaround
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# https://github.com/matrix-org/synapse/issues/1733.
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# The reason is to avoid holding the linearizer lock
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# whilst processing inbound /send transactions, causing
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# FDs to stack up and block other inbound transactions
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# which empirically can currently take up to 30 minutes.
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#
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# N.B. this explicitly disables retry attempts.
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#
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# N.B. this also increases our chances of falling back to
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# fetching fresh state for the room if the missing event
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# can't be found, which slightly reduces our security.
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# it may also increase our DAG extremity count for the room,
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# causing additional state resolution? See #1760.
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# However, fetching state doesn't hold the linearizer lock
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# apparently.
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#
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# see https://github.com/matrix-org/synapse/pull/1744
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#
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# ----
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#
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|
# Update richvdh 2018/09/18: There are a number of problems with timing this
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# request out agressively on the client side:
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#
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# - it plays badly with the server-side rate-limiter, which starts tarpitting you
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# if you send too many requests at once, so you end up with the server carefully
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# working through the backlog of your requests, which you have already timed
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# out.
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#
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# - for this request in particular, we now (as of
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# https://github.com/matrix-org/synapse/pull/3456) reject any PDUs where the
|
|
# server can't produce a plausible-looking set of prev_events - so we becone
|
|
# much more likely to reject the event.
|
|
#
|
|
# - contrary to what it says above, we do *not* fall back to fetching fresh state
|
|
# for the room if get_missing_events times out. Rather, we give up processing
|
|
# the PDU whose prevs we are missing, which then makes it much more likely that
|
|
# we'll end up back here for the *next* PDU in the list, which exacerbates the
|
|
# problem.
|
|
#
|
|
# - the agressive 10s timeout was introduced to deal with incoming federation
|
|
# requests taking 8 hours to process. It's not entirely clear why that was going
|
|
# on; certainly there were other issues causing traffic storms which are now
|
|
# resolved, and I think in any case we may be more sensible about our locking
|
|
# now. We're *certainly* more sensible about our logging.
|
|
#
|
|
# All that said: Let's try increasing the timout to 60s and see what happens.
|
|
|
|
try:
|
|
missing_events = yield self.federation_client.get_missing_events(
|
|
origin,
|
|
room_id,
|
|
earliest_events_ids=list(latest),
|
|
latest_events=[pdu],
|
|
limit=10,
|
|
min_depth=min_depth,
|
|
timeout=60000,
|
|
)
|
|
except RequestSendFailed as e:
|
|
# We failed to get the missing events, but since we need to handle
|
|
# the case of `get_missing_events` not returning the necessary
|
|
# events anyway, it is safe to simply log the error and continue.
|
|
logger.warning(
|
|
"[%s %s]: Failed to get prev_events: %s", room_id, event_id, e
|
|
)
|
|
return
|
|
|
|
logger.info(
|
|
"[%s %s]: Got %d prev_events: %s",
|
|
room_id,
|
|
event_id,
|
|
len(missing_events),
|
|
shortstr(missing_events),
|
|
)
|
|
|
|
# We want to sort these by depth so we process them and
|
|
# tell clients about them in order.
|
|
missing_events.sort(key=lambda x: x.depth)
|
|
|
|
for ev in missing_events:
|
|
logger.info(
|
|
"[%s %s] Handling received prev_event %s",
|
|
room_id,
|
|
event_id,
|
|
ev.event_id,
|
|
)
|
|
with nested_logging_context(ev.event_id):
|
|
try:
|
|
yield self.on_receive_pdu(origin, ev, sent_to_us_directly=False)
|
|
except FederationError as e:
|
|
if e.code == 403:
|
|
logger.warning(
|
|
"[%s %s] Received prev_event %s failed history check.",
|
|
room_id,
|
|
event_id,
|
|
ev.event_id,
|
|
)
|
|
else:
|
|
raise
|
|
|
|
@defer.inlineCallbacks
|
|
def _process_received_pdu(self, origin, event, state, auth_chain):
|
|
""" Called when we have a new pdu. We need to do auth checks and put it
|
|
through the StateHandler.
|
|
"""
|
|
room_id = event.room_id
|
|
event_id = event.event_id
|
|
|
|
logger.debug("[%s %s] Processing event: %s", room_id, event_id, event)
|
|
|
|
event_ids = set()
|
|
if state:
|
|
event_ids |= {e.event_id for e in state}
|
|
if auth_chain:
|
|
event_ids |= {e.event_id for e in auth_chain}
|
|
|
|
seen_ids = yield self.store.have_seen_events(event_ids)
|
|
|
|
if state and auth_chain is not None:
|
|
# If we have any state or auth_chain given to us by the replication
|
|
# layer, then we should handle them (if we haven't before.)
|
|
|
|
event_infos = []
|
|
|
|
for e in itertools.chain(auth_chain, state):
|
|
if e.event_id in seen_ids:
|
|
continue
|
|
e.internal_metadata.outlier = True
|
|
auth_ids = e.auth_event_ids()
|
|
auth = {
|
|
(e.type, e.state_key): e
|
|
for e in auth_chain
|
|
if e.event_id in auth_ids or e.type == EventTypes.Create
|
|
}
|
|
event_infos.append({"event": e, "auth_events": auth})
|
|
seen_ids.add(e.event_id)
|
|
|
|
logger.info(
|
|
"[%s %s] persisting newly-received auth/state events %s",
|
|
room_id,
|
|
event_id,
|
|
[e["event"].event_id for e in event_infos],
|
|
)
|
|
yield self._handle_new_events(origin, event_infos)
|
|
|
|
try:
|
|
context = yield self._handle_new_event(origin, event, state=state)
|
|
except AuthError as e:
|
|
raise FederationError("ERROR", e.code, e.msg, affected=event.event_id)
|
|
|
|
room = yield self.store.get_room(room_id)
|
|
|
|
if not room:
|
|
try:
|
|
yield self.store.store_room(
|
|
room_id=room_id, room_creator_user_id="", is_public=False
|
|
)
|
|
except StoreError:
|
|
logger.exception("Failed to store room.")
|
|
|
|
if event.type == EventTypes.Member:
|
|
if event.membership == Membership.JOIN:
|
|
# Only fire user_joined_room if the user has acutally
|
|
# joined the room. Don't bother if the user is just
|
|
# changing their profile info.
|
|
newly_joined = True
|
|
|
|
prev_state_ids = yield context.get_prev_state_ids(self.store)
|
|
|
|
prev_state_id = prev_state_ids.get((event.type, event.state_key))
|
|
if prev_state_id:
|
|
prev_state = yield self.store.get_event(
|
|
prev_state_id, allow_none=True
|
|
)
|
|
if prev_state and prev_state.membership == Membership.JOIN:
|
|
newly_joined = False
|
|
|
|
if newly_joined:
|
|
user = UserID.from_string(event.state_key)
|
|
yield self.user_joined_room(user, room_id)
|
|
|
|
@log_function
|
|
@defer.inlineCallbacks
|
|
def backfill(self, dest, room_id, limit, extremities):
|
|
""" Trigger a backfill request to `dest` for the given `room_id`
|
|
|
|
This will attempt to get more events from the remote. If the other side
|
|
has no new events to offer, this will return an empty list.
|
|
|
|
As the events are received, we check their signatures, and also do some
|
|
sanity-checking on them. If any of the backfilled events are invalid,
|
|
this method throws a SynapseError.
|
|
|
|
TODO: make this more useful to distinguish failures of the remote
|
|
server from invalid events (there is probably no point in trying to
|
|
re-fetch invalid events from every other HS in the room.)
|
|
"""
|
|
if dest == self.server_name:
|
|
raise SynapseError(400, "Can't backfill from self.")
|
|
|
|
room_version = yield self.store.get_room_version(room_id)
|
|
|
|
events = yield self.federation_client.backfill(
|
|
dest, room_id, limit=limit, extremities=extremities
|
|
)
|
|
|
|
# ideally we'd sanity check the events here for excess prev_events etc,
|
|
# but it's hard to reject events at this point without completely
|
|
# breaking backfill in the same way that it is currently broken by
|
|
# events whose signature we cannot verify (#3121).
|
|
#
|
|
# So for now we accept the events anyway. #3124 tracks this.
|
|
#
|
|
# for ev in events:
|
|
# self._sanity_check_event(ev)
|
|
|
|
# Don't bother processing events we already have.
|
|
seen_events = yield self.store.have_events_in_timeline(
|
|
set(e.event_id for e in events)
|
|
)
|
|
|
|
events = [e for e in events if e.event_id not in seen_events]
|
|
|
|
if not events:
|
|
return []
|
|
|
|
event_map = {e.event_id: e for e in events}
|
|
|
|
event_ids = set(e.event_id for e in events)
|
|
|
|
edges = [ev.event_id for ev in events if set(ev.prev_event_ids()) - event_ids]
|
|
|
|
logger.info("backfill: Got %d events with %d edges", len(events), len(edges))
|
|
|
|
# For each edge get the current state.
|
|
|
|
auth_events = {}
|
|
state_events = {}
|
|
events_to_state = {}
|
|
for e_id in edges:
|
|
state, auth = yield self.federation_client.get_state_for_room(
|
|
destination=dest, room_id=room_id, event_id=e_id
|
|
)
|
|
auth_events.update({a.event_id: a for a in auth})
|
|
auth_events.update({s.event_id: s for s in state})
|
|
state_events.update({s.event_id: s for s in state})
|
|
events_to_state[e_id] = state
|
|
|
|
required_auth = set(
|
|
a_id
|
|
for event in events
|
|
+ list(state_events.values())
|
|
+ list(auth_events.values())
|
|
for a_id in event.auth_event_ids()
|
|
)
|
|
auth_events.update(
|
|
{e_id: event_map[e_id] for e_id in required_auth if e_id in event_map}
|
|
)
|
|
missing_auth = required_auth - set(auth_events)
|
|
failed_to_fetch = set()
|
|
|
|
# Try and fetch any missing auth events from both DB and remote servers.
|
|
# We repeatedly do this until we stop finding new auth events.
|
|
while missing_auth - failed_to_fetch:
|
|
logger.info("Missing auth for backfill: %r", missing_auth)
|
|
ret_events = yield self.store.get_events(missing_auth - failed_to_fetch)
|
|
auth_events.update(ret_events)
|
|
|
|
required_auth.update(
|
|
a_id for event in ret_events.values() for a_id in event.auth_event_ids()
|
|
)
|
|
missing_auth = required_auth - set(auth_events)
|
|
|
|
if missing_auth - failed_to_fetch:
|
|
logger.info(
|
|
"Fetching missing auth for backfill: %r",
|
|
missing_auth - failed_to_fetch,
|
|
)
|
|
|
|
results = yield make_deferred_yieldable(
|
|
defer.gatherResults(
|
|
[
|
|
run_in_background(
|
|
self.federation_client.get_pdu,
|
|
[dest],
|
|
event_id,
|
|
room_version=room_version,
|
|
outlier=True,
|
|
timeout=10000,
|
|
)
|
|
for event_id in missing_auth - failed_to_fetch
|
|
],
|
|
consumeErrors=True,
|
|
)
|
|
).addErrback(unwrapFirstError)
|
|
auth_events.update({a.event_id: a for a in results if a})
|
|
required_auth.update(
|
|
a_id
|
|
for event in results
|
|
if event
|
|
for a_id in event.auth_event_ids()
|
|
)
|
|
missing_auth = required_auth - set(auth_events)
|
|
|
|
failed_to_fetch = missing_auth - set(auth_events)
|
|
|
|
seen_events = yield self.store.have_seen_events(
|
|
set(auth_events.keys()) | set(state_events.keys())
|
|
)
|
|
|
|
# We now have a chunk of events plus associated state and auth chain to
|
|
# persist. We do the persistence in two steps:
|
|
# 1. Auth events and state get persisted as outliers, plus the
|
|
# backward extremities get persisted (as non-outliers).
|
|
# 2. The rest of the events in the chunk get persisted one by one, as
|
|
# each one depends on the previous event for its state.
|
|
#
|
|
# The important thing is that events in the chunk get persisted as
|
|
# non-outliers, including when those events are also in the state or
|
|
# auth chain. Caution must therefore be taken to ensure that they are
|
|
# not accidentally marked as outliers.
|
|
|
|
# Step 1a: persist auth events that *don't* appear in the chunk
|
|
ev_infos = []
|
|
for a in auth_events.values():
|
|
# We only want to persist auth events as outliers that we haven't
|
|
# seen and aren't about to persist as part of the backfilled chunk.
|
|
if a.event_id in seen_events or a.event_id in event_map:
|
|
continue
|
|
|
|
a.internal_metadata.outlier = True
|
|
ev_infos.append(
|
|
{
|
|
"event": a,
|
|
"auth_events": {
|
|
(
|
|
auth_events[a_id].type,
|
|
auth_events[a_id].state_key,
|
|
): auth_events[a_id]
|
|
for a_id in a.auth_event_ids()
|
|
if a_id in auth_events
|
|
},
|
|
}
|
|
)
|
|
|
|
# Step 1b: persist the events in the chunk we fetched state for (i.e.
|
|
# the backwards extremities) as non-outliers.
|
|
for e_id in events_to_state:
|
|
# For paranoia we ensure that these events are marked as
|
|
# non-outliers
|
|
ev = event_map[e_id]
|
|
assert not ev.internal_metadata.is_outlier()
|
|
|
|
ev_infos.append(
|
|
{
|
|
"event": ev,
|
|
"state": events_to_state[e_id],
|
|
"auth_events": {
|
|
(
|
|
auth_events[a_id].type,
|
|
auth_events[a_id].state_key,
|
|
): auth_events[a_id]
|
|
for a_id in ev.auth_event_ids()
|
|
if a_id in auth_events
|
|
},
|
|
}
|
|
)
|
|
|
|
yield self._handle_new_events(dest, ev_infos, backfilled=True)
|
|
|
|
# Step 2: Persist the rest of the events in the chunk one by one
|
|
events.sort(key=lambda e: e.depth)
|
|
|
|
for event in events:
|
|
if event in events_to_state:
|
|
continue
|
|
|
|
# For paranoia we ensure that these events are marked as
|
|
# non-outliers
|
|
assert not event.internal_metadata.is_outlier()
|
|
|
|
# We store these one at a time since each event depends on the
|
|
# previous to work out the state.
|
|
# TODO: We can probably do something more clever here.
|
|
yield self._handle_new_event(dest, event, backfilled=True)
|
|
|
|
return events
|
|
|
|
@defer.inlineCallbacks
|
|
def maybe_backfill(self, room_id, current_depth):
|
|
"""Checks the database to see if we should backfill before paginating,
|
|
and if so do.
|
|
"""
|
|
extremities = yield self.store.get_oldest_events_with_depth_in_room(room_id)
|
|
|
|
if not extremities:
|
|
logger.debug("Not backfilling as no extremeties found.")
|
|
return
|
|
|
|
# We only want to paginate if we can actually see the events we'll get,
|
|
# as otherwise we'll just spend a lot of resources to get redacted
|
|
# events.
|
|
#
|
|
# We do this by filtering all the backwards extremities and seeing if
|
|
# any remain. Given we don't have the extremity events themselves, we
|
|
# need to actually check the events that reference them.
|
|
#
|
|
# *Note*: the spec wants us to keep backfilling until we reach the start
|
|
# of the room in case we are allowed to see some of the history. However
|
|
# in practice that causes more issues than its worth, as a) its
|
|
# relatively rare for there to be any visible history and b) even when
|
|
# there is its often sufficiently long ago that clients would stop
|
|
# attempting to paginate before backfill reached the visible history.
|
|
#
|
|
# TODO: If we do do a backfill then we should filter the backwards
|
|
# extremities to only include those that point to visible portions of
|
|
# history.
|
|
#
|
|
# TODO: Correctly handle the case where we are allowed to see the
|
|
# forward event but not the backward extremity, e.g. in the case of
|
|
# initial join of the server where we are allowed to see the join
|
|
# event but not anything before it. This would require looking at the
|
|
# state *before* the event, ignoring the special casing certain event
|
|
# types have.
|
|
|
|
forward_events = yield self.store.get_successor_events(list(extremities))
|
|
|
|
extremities_events = yield self.store.get_events(
|
|
forward_events, check_redacted=False, get_prev_content=False
|
|
)
|
|
|
|
# We set `check_history_visibility_only` as we might otherwise get false
|
|
# positives from users having been erased.
|
|
filtered_extremities = yield filter_events_for_server(
|
|
self.storage,
|
|
self.server_name,
|
|
list(extremities_events.values()),
|
|
redact=False,
|
|
check_history_visibility_only=True,
|
|
)
|
|
|
|
if not filtered_extremities:
|
|
return False
|
|
|
|
# Check if we reached a point where we should start backfilling.
|
|
sorted_extremeties_tuple = sorted(extremities.items(), key=lambda e: -int(e[1]))
|
|
max_depth = sorted_extremeties_tuple[0][1]
|
|
|
|
# We don't want to specify too many extremities as it causes the backfill
|
|
# request URI to be too long.
|
|
extremities = dict(sorted_extremeties_tuple[:5])
|
|
|
|
if current_depth > max_depth:
|
|
logger.debug(
|
|
"Not backfilling as we don't need to. %d < %d", max_depth, current_depth
|
|
)
|
|
return
|
|
|
|
# Now we need to decide which hosts to hit first.
|
|
|
|
# First we try hosts that are already in the room
|
|
# TODO: HEURISTIC ALERT.
|
|
|
|
curr_state = yield self.state_handler.get_current_state(room_id)
|
|
|
|
def get_domains_from_state(state):
|
|
"""Get joined domains from state
|
|
|
|
Args:
|
|
state (dict[tuple, FrozenEvent]): State map from type/state
|
|
key to event.
|
|
|
|
Returns:
|
|
list[tuple[str, int]]: Returns a list of servers with the
|
|
lowest depth of their joins. Sorted by lowest depth first.
|
|
"""
|
|
joined_users = [
|
|
(state_key, int(event.depth))
|
|
for (e_type, state_key), event in iteritems(state)
|
|
if e_type == EventTypes.Member and event.membership == Membership.JOIN
|
|
]
|
|
|
|
joined_domains = {}
|
|
for u, d in joined_users:
|
|
try:
|
|
dom = get_domain_from_id(u)
|
|
old_d = joined_domains.get(dom)
|
|
if old_d:
|
|
joined_domains[dom] = min(d, old_d)
|
|
else:
|
|
joined_domains[dom] = d
|
|
except Exception:
|
|
pass
|
|
|
|
return sorted(joined_domains.items(), key=lambda d: d[1])
|
|
|
|
curr_domains = get_domains_from_state(curr_state)
|
|
|
|
likely_domains = [
|
|
domain for domain, depth in curr_domains if domain != self.server_name
|
|
]
|
|
|
|
@defer.inlineCallbacks
|
|
def try_backfill(domains):
|
|
# TODO: Should we try multiple of these at a time?
|
|
for dom in domains:
|
|
try:
|
|
yield self.backfill(
|
|
dom, room_id, limit=100, extremities=extremities
|
|
)
|
|
# If this succeeded then we probably already have the
|
|
# appropriate stuff.
|
|
# TODO: We can probably do something more intelligent here.
|
|
return True
|
|
except SynapseError as e:
|
|
logger.info("Failed to backfill from %s because %s", dom, e)
|
|
continue
|
|
except CodeMessageException as e:
|
|
if 400 <= e.code < 500:
|
|
raise
|
|
|
|
logger.info("Failed to backfill from %s because %s", dom, e)
|
|
continue
|
|
except NotRetryingDestination as e:
|
|
logger.info(str(e))
|
|
continue
|
|
except RequestSendFailed as e:
|
|
logger.info("Falied to get backfill from %s because %s", dom, e)
|
|
continue
|
|
except FederationDeniedError as e:
|
|
logger.info(e)
|
|
continue
|
|
except Exception as e:
|
|
logger.exception("Failed to backfill from %s because %s", dom, e)
|
|
continue
|
|
|
|
return False
|
|
|
|
success = yield try_backfill(likely_domains)
|
|
if success:
|
|
return True
|
|
|
|
# Huh, well *those* domains didn't work out. Lets try some domains
|
|
# from the time.
|
|
|
|
tried_domains = set(likely_domains)
|
|
tried_domains.add(self.server_name)
|
|
|
|
event_ids = list(extremities.keys())
|
|
|
|
logger.debug("calling resolve_state_groups in _maybe_backfill")
|
|
resolve = preserve_fn(self.state_handler.resolve_state_groups_for_events)
|
|
states = yield make_deferred_yieldable(
|
|
defer.gatherResults(
|
|
[resolve(room_id, [e]) for e in event_ids], consumeErrors=True
|
|
)
|
|
)
|
|
|
|
# dict[str, dict[tuple, str]], a map from event_id to state map of
|
|
# event_ids.
|
|
states = dict(zip(event_ids, [s.state for s in states]))
|
|
|
|
state_map = yield self.store.get_events(
|
|
[e_id for ids in itervalues(states) for e_id in itervalues(ids)],
|
|
get_prev_content=False,
|
|
)
|
|
states = {
|
|
key: {
|
|
k: state_map[e_id]
|
|
for k, e_id in iteritems(state_dict)
|
|
if e_id in state_map
|
|
}
|
|
for key, state_dict in iteritems(states)
|
|
}
|
|
|
|
for e_id, _ in sorted_extremeties_tuple:
|
|
likely_domains = get_domains_from_state(states[e_id])
|
|
|
|
success = yield try_backfill(
|
|
[dom for dom, _ in likely_domains if dom not in tried_domains]
|
|
)
|
|
if success:
|
|
return True
|
|
|
|
tried_domains.update(dom for dom, _ in likely_domains)
|
|
|
|
return False
|
|
|
|
def _sanity_check_event(self, ev):
|
|
"""
|
|
Do some early sanity checks of a received event
|
|
|
|
In particular, checks it doesn't have an excessive number of
|
|
prev_events or auth_events, which could cause a huge state resolution
|
|
or cascade of event fetches.
|
|
|
|
Args:
|
|
ev (synapse.events.EventBase): event to be checked
|
|
|
|
Returns: None
|
|
|
|
Raises:
|
|
SynapseError if the event does not pass muster
|
|
"""
|
|
if len(ev.prev_event_ids()) > 20:
|
|
logger.warning(
|
|
"Rejecting event %s which has %i prev_events",
|
|
ev.event_id,
|
|
len(ev.prev_event_ids()),
|
|
)
|
|
raise SynapseError(http_client.BAD_REQUEST, "Too many prev_events")
|
|
|
|
if len(ev.auth_event_ids()) > 10:
|
|
logger.warning(
|
|
"Rejecting event %s which has %i auth_events",
|
|
ev.event_id,
|
|
len(ev.auth_event_ids()),
|
|
)
|
|
raise SynapseError(http_client.BAD_REQUEST, "Too many auth_events")
|
|
|
|
@defer.inlineCallbacks
|
|
def send_invite(self, target_host, event):
|
|
""" Sends the invite to the remote server for signing.
|
|
|
|
Invites must be signed by the invitee's server before distribution.
|
|
"""
|
|
pdu = yield self.federation_client.send_invite(
|
|
destination=target_host,
|
|
room_id=event.room_id,
|
|
event_id=event.event_id,
|
|
pdu=event,
|
|
)
|
|
|
|
return pdu
|
|
|
|
@defer.inlineCallbacks
|
|
def on_event_auth(self, event_id):
|
|
event = yield self.store.get_event(event_id)
|
|
auth = yield self.store.get_auth_chain(
|
|
[auth_id for auth_id in event.auth_event_ids()], include_given=True
|
|
)
|
|
return [e for e in auth]
|
|
|
|
@log_function
|
|
@defer.inlineCallbacks
|
|
def do_invite_join(self, target_hosts, room_id, joinee, content):
|
|
""" Attempts to join the `joinee` to the room `room_id` via the
|
|
servers contained in `target_hosts`.
|
|
|
|
This first triggers a /make_join/ request that returns a partial
|
|
event that we can fill out and sign. This is then sent to the
|
|
remote server via /send_join/ which responds with the state at that
|
|
event and the auth_chains.
|
|
|
|
We suspend processing of any received events from this room until we
|
|
have finished processing the join.
|
|
|
|
Args:
|
|
target_hosts (Iterable[str]): List of servers to attempt to join the room with.
|
|
|
|
room_id (str): The ID of the room to join.
|
|
|
|
joinee (str): The User ID of the joining user.
|
|
|
|
content (dict): The event content to use for the join event.
|
|
"""
|
|
logger.debug("Joining %s to %s", joinee, room_id)
|
|
|
|
origin, event, event_format_version = yield self._make_and_verify_event(
|
|
target_hosts,
|
|
room_id,
|
|
joinee,
|
|
"join",
|
|
content,
|
|
params={"ver": KNOWN_ROOM_VERSIONS},
|
|
)
|
|
|
|
# This shouldn't happen, because the RoomMemberHandler has a
|
|
# linearizer lock which only allows one operation per user per room
|
|
# at a time - so this is just paranoia.
|
|
assert room_id not in self.room_queues
|
|
|
|
self.room_queues[room_id] = []
|
|
|
|
yield self._clean_room_for_join(room_id)
|
|
|
|
handled_events = set()
|
|
|
|
try:
|
|
# Try the host we successfully got a response to /make_join/
|
|
# request first.
|
|
try:
|
|
target_hosts.remove(origin)
|
|
target_hosts.insert(0, origin)
|
|
except ValueError:
|
|
pass
|
|
ret = yield self.federation_client.send_join(
|
|
target_hosts, event, event_format_version
|
|
)
|
|
|
|
origin = ret["origin"]
|
|
state = ret["state"]
|
|
auth_chain = ret["auth_chain"]
|
|
auth_chain.sort(key=lambda e: e.depth)
|
|
|
|
handled_events.update([s.event_id for s in state])
|
|
handled_events.update([a.event_id for a in auth_chain])
|
|
handled_events.add(event.event_id)
|
|
|
|
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)
|
|
|
|
try:
|
|
yield self.store.store_room(
|
|
room_id=room_id, room_creator_user_id="", is_public=False
|
|
)
|
|
except Exception:
|
|
# FIXME
|
|
pass
|
|
|
|
yield self._persist_auth_tree(origin, auth_chain, state, event)
|
|
|
|
# Check whether this room is the result of an upgrade of a room we already know
|
|
# about. If so, migrate over user information
|
|
predecessor = yield self.store.get_room_predecessor(room_id)
|
|
if not predecessor:
|
|
return
|
|
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()
|
|
yield member_handler.transfer_room_state_on_room_upgrade(
|
|
old_room_id, room_id
|
|
)
|
|
|
|
logger.debug("Finished joining %s to %s", joinee, room_id)
|
|
finally:
|
|
room_queue = self.room_queues[room_id]
|
|
del self.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 deferred, but don't wait for it.
|
|
|
|
run_in_background(self._handle_queued_pdus, room_queue)
|
|
|
|
return True
|
|
|
|
@defer.inlineCallbacks
|
|
def _handle_queued_pdus(self, room_queue):
|
|
"""Process PDUs which got queued up while we were busy send_joining.
|
|
|
|
Args:
|
|
room_queue (list[FrozenEvent, str]): 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 %s",
|
|
p.event_id,
|
|
p.room_id,
|
|
)
|
|
with nested_logging_context(p.event_id):
|
|
yield self.on_receive_pdu(origin, p, sent_to_us_directly=True)
|
|
except Exception as e:
|
|
logger.warning(
|
|
"Error handling queued PDU %s from %s: %s", p.event_id, origin, e
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_make_join_request(self, origin, room_id, user_id):
|
|
""" 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 (str): The (verified) server name of the requesting server.
|
|
room_id (str): Room to create join event in
|
|
user_id (str): The user to create the join for
|
|
|
|
Returns:
|
|
Deferred[FrozenEvent]
|
|
"""
|
|
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)
|
|
|
|
event_content = {"membership": Membership.JOIN}
|
|
|
|
room_version = yield self.store.get_room_version(room_id)
|
|
|
|
builder = self.event_builder_factory.new(
|
|
room_version,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": event_content,
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
try:
|
|
event, context = yield self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Failed to create join to %s because %s", room_id, e)
|
|
raise e
|
|
|
|
event_allowed = yield self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.info("Creation of join %s forbidden by third-party rules", event)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
|
|
# 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`
|
|
yield self.auth.check_from_context(
|
|
room_version, event, context, do_sig_check=False
|
|
)
|
|
|
|
return event
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_send_join_request(self, origin, pdu):
|
|
""" We have received a join event for a room. Fully process it and
|
|
respond with the current state and auth chains.
|
|
"""
|
|
event = pdu
|
|
|
|
logger.debug(
|
|
"on_send_join_request from %s: Got event: %s, signatures: %s",
|
|
origin,
|
|
event.event_id,
|
|
event.signatures,
|
|
)
|
|
|
|
if get_domain_from_id(event.sender) != origin:
|
|
logger.info(
|
|
"Got /send_join request for user %r from different origin %s",
|
|
event.sender,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
event.internal_metadata.outlier = False
|
|
# Send this event on behalf of the origin server.
|
|
#
|
|
# The reasons we have the destination server rather than the origin
|
|
# server send it are slightly mysterious: the origin server should have
|
|
# all the neccessary state once it gets the response to the send_join,
|
|
# so it could send the event itself if it wanted to. It may be that
|
|
# doing it this way reduces failure modes, or avoids certain attacks
|
|
# where a new server selectively tells a subset of the federation that
|
|
# it has joined.
|
|
#
|
|
# The fact is that, as of the current writing, Synapse doesn't send out
|
|
# the join event over federation after joining, and changing it now
|
|
# would introduce the danger of backwards-compatibility problems.
|
|
event.internal_metadata.send_on_behalf_of = origin
|
|
|
|
context = yield self._handle_new_event(origin, event)
|
|
|
|
event_allowed = yield self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.info("Sending of join %s forbidden by third-party rules", event)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
|
|
logger.debug(
|
|
"on_send_join_request: After _handle_new_event: %s, sigs: %s",
|
|
event.event_id,
|
|
event.signatures,
|
|
)
|
|
|
|
if event.type == EventTypes.Member:
|
|
if event.content["membership"] == Membership.JOIN:
|
|
user = UserID.from_string(event.state_key)
|
|
yield self.user_joined_room(user, event.room_id)
|
|
|
|
prev_state_ids = yield context.get_prev_state_ids(self.store)
|
|
|
|
state_ids = list(prev_state_ids.values())
|
|
auth_chain = yield self.store.get_auth_chain(state_ids)
|
|
|
|
state = yield self.store.get_events(list(prev_state_ids.values()))
|
|
|
|
return {"state": list(state.values()), "auth_chain": auth_chain}
|
|
|
|
@defer.inlineCallbacks
|
|
def on_invite_request(self, origin, pdu):
|
|
""" We've got an invite event. Process and persist it. Sign it.
|
|
|
|
Respond with the now signed event.
|
|
"""
|
|
event = pdu
|
|
|
|
if event.state_key is None:
|
|
raise SynapseError(400, "The invite event did not have a state key")
|
|
|
|
is_blocked = yield 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.block_non_admin_invites:
|
|
raise SynapseError(403, "This server does not accept room invites")
|
|
|
|
if not 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(http_client.FORBIDDEN, "Cannot invite this user")
|
|
|
|
event.internal_metadata.outlier = True
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
event.get_pdu_json(), self.hs.hostname, self.hs.config.signing_key[0]
|
|
)
|
|
)
|
|
|
|
context = yield self.state_handler.compute_event_context(event)
|
|
yield self.persist_events_and_notify([(event, context)])
|
|
|
|
return event
|
|
|
|
@defer.inlineCallbacks
|
|
def do_remotely_reject_invite(self, target_hosts, room_id, user_id, content):
|
|
origin, event, event_format_version = yield 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 succesfully called /make_leave/ on first for
|
|
# the /send_leave/ request.
|
|
try:
|
|
target_hosts.remove(origin)
|
|
target_hosts.insert(0, origin)
|
|
except ValueError:
|
|
pass
|
|
|
|
yield self.federation_client.send_leave(target_hosts, event)
|
|
|
|
context = yield self.state_handler.compute_event_context(event)
|
|
yield self.persist_events_and_notify([(event, context)])
|
|
|
|
return event
|
|
|
|
@defer.inlineCallbacks
|
|
def _make_and_verify_event(
|
|
self, target_hosts, room_id, user_id, membership, content={}, params=None
|
|
):
|
|
origin, event, format_ver = yield 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, format_ver
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_make_leave_request(self, origin, room_id, user_id):
|
|
""" 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 (str): The (verified) server name of the requesting server.
|
|
room_id (str): Room to create leave event in
|
|
user_id (str): The user to create the leave for
|
|
|
|
Returns:
|
|
Deferred[FrozenEvent]
|
|
"""
|
|
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 = yield self.store.get_room_version(room_id)
|
|
builder = self.event_builder_factory.new(
|
|
room_version,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": {"membership": Membership.LEAVE},
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
event, context = yield self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
event_allowed = yield self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.warning("Creation of leave %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_leave_request`
|
|
yield self.auth.check_from_context(
|
|
room_version, event, context, do_sig_check=False
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Failed to create new leave %r because %s", event, e)
|
|
raise e
|
|
|
|
return event
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_send_leave_request(self, origin, pdu):
|
|
""" We have received a leave event for a room. Fully process it."""
|
|
event = pdu
|
|
|
|
logger.debug(
|
|
"on_send_leave_request: Got event: %s, signatures: %s",
|
|
event.event_id,
|
|
event.signatures,
|
|
)
|
|
|
|
if get_domain_from_id(event.sender) != origin:
|
|
logger.info(
|
|
"Got /send_leave request for user %r from different origin %s",
|
|
event.sender,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
event.internal_metadata.outlier = False
|
|
|
|
context = yield self._handle_new_event(origin, event)
|
|
|
|
event_allowed = yield self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.info("Sending of leave %s forbidden by third-party rules", event)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
|
|
logger.debug(
|
|
"on_send_leave_request: After _handle_new_event: %s, sigs: %s",
|
|
event.event_id,
|
|
event.signatures,
|
|
)
|
|
|
|
return None
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_for_pdu(self, room_id, event_id):
|
|
"""Returns the state at the event. i.e. not including said event.
|
|
"""
|
|
|
|
event = yield self.store.get_event(
|
|
event_id, allow_none=False, check_room_id=room_id
|
|
)
|
|
|
|
state_groups = yield self.state_store.get_state_groups(room_id, [event_id])
|
|
|
|
if state_groups:
|
|
_, state = list(iteritems(state_groups)).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 = yield 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 []
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_ids_for_pdu(self, room_id, event_id):
|
|
"""Returns the state at the event. i.e. not including said event.
|
|
"""
|
|
event = yield self.store.get_event(
|
|
event_id, allow_none=False, check_room_id=room_id
|
|
)
|
|
|
|
state_groups = yield 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 []
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_backfill_request(self, origin, room_id, pdu_list, limit):
|
|
in_room = yield self.auth.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
events = yield self.store.get_backfill_events(room_id, pdu_list, limit)
|
|
|
|
events = yield filter_events_for_server(self.storage, origin, events)
|
|
|
|
return events
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def get_persisted_pdu(self, origin, event_id):
|
|
"""Get an event from the database for the given server.
|
|
|
|
Args:
|
|
origin [str]: hostname of server which is requesting the event; we
|
|
will check that the server is allowed to see it.
|
|
event_id [str]: id of the event being requested
|
|
|
|
Returns:
|
|
Deferred[EventBase|None]: 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 = yield self.store.get_event(
|
|
event_id, allow_none=True, allow_rejected=True
|
|
)
|
|
|
|
if event:
|
|
in_room = yield self.auth.check_host_in_room(event.room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
events = yield filter_events_for_server(self.storage, origin, [event])
|
|
event = events[0]
|
|
return event
|
|
else:
|
|
return None
|
|
|
|
def get_min_depth_for_context(self, context):
|
|
return self.store.get_min_depth(context)
|
|
|
|
@defer.inlineCallbacks
|
|
def _handle_new_event(
|
|
self, origin, event, state=None, auth_events=None, backfilled=False
|
|
):
|
|
context = yield self._prep_event(
|
|
origin, event, state=state, auth_events=auth_events, backfilled=backfilled
|
|
)
|
|
|
|
# reraise does not allow inlineCallbacks to preserve the stacktrace, so we
|
|
# hack around with a try/finally instead.
|
|
success = False
|
|
try:
|
|
if (
|
|
not event.internal_metadata.is_outlier()
|
|
and not backfilled
|
|
and not context.rejected
|
|
):
|
|
yield self.action_generator.handle_push_actions_for_event(
|
|
event, context
|
|
)
|
|
|
|
yield self.persist_events_and_notify(
|
|
[(event, context)], backfilled=backfilled
|
|
)
|
|
success = True
|
|
finally:
|
|
if not success:
|
|
run_in_background(
|
|
self.store.remove_push_actions_from_staging, event.event_id
|
|
)
|
|
|
|
return context
|
|
|
|
@defer.inlineCallbacks
|
|
def _handle_new_events(self, origin, event_infos, backfilled=False):
|
|
"""Creates the appropriate contexts and persists events. The events
|
|
should not depend on one another, e.g. this should be used to persist
|
|
a bunch of outliers, but not a chunk of individual events that depend
|
|
on each other for state calculations.
|
|
|
|
Notifies about the events where appropriate.
|
|
"""
|
|
|
|
@defer.inlineCallbacks
|
|
def prep(ev_info):
|
|
event = ev_info["event"]
|
|
with nested_logging_context(suffix=event.event_id):
|
|
res = yield self._prep_event(
|
|
origin,
|
|
event,
|
|
state=ev_info.get("state"),
|
|
auth_events=ev_info.get("auth_events"),
|
|
backfilled=backfilled,
|
|
)
|
|
return res
|
|
|
|
contexts = yield make_deferred_yieldable(
|
|
defer.gatherResults(
|
|
[run_in_background(prep, ev_info) for ev_info in event_infos],
|
|
consumeErrors=True,
|
|
)
|
|
)
|
|
|
|
yield self.persist_events_and_notify(
|
|
[
|
|
(ev_info["event"], context)
|
|
for ev_info, context in zip(event_infos, contexts)
|
|
],
|
|
backfilled=backfilled,
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def _persist_auth_tree(self, origin, auth_events, state, event):
|
|
"""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 (str): Where the events came from
|
|
auth_events (list)
|
|
state (list)
|
|
event (Event)
|
|
|
|
Returns:
|
|
Deferred
|
|
"""
|
|
events_to_context = {}
|
|
for e in itertools.chain(auth_events, state):
|
|
e.internal_metadata.outlier = True
|
|
ctx = yield self.state_handler.compute_event_context(e)
|
|
events_to_context[e.event_id] = ctx
|
|
|
|
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 = create_event.content.get(
|
|
"room_version", RoomVersions.V1.identifier
|
|
)
|
|
|
|
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 = yield 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:
|
|
event_auth.check(room_version, e, auth_events=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
|
|
|
|
yield self.persist_events_and_notify(
|
|
[
|
|
(e, events_to_context[e.event_id])
|
|
for e in itertools.chain(auth_events, state)
|
|
]
|
|
)
|
|
|
|
new_event_context = yield self.state_handler.compute_event_context(
|
|
event, old_state=state
|
|
)
|
|
|
|
yield self.persist_events_and_notify([(event, new_event_context)])
|
|
|
|
@defer.inlineCallbacks
|
|
def _prep_event(self, origin, event, state, auth_events, backfilled):
|
|
"""
|
|
|
|
Args:
|
|
origin:
|
|
event:
|
|
state:
|
|
auth_events:
|
|
backfilled (bool)
|
|
|
|
Returns:
|
|
Deferred, which resolves to synapse.events.snapshot.EventContext
|
|
"""
|
|
context = yield self.state_handler.compute_event_context(event, old_state=state)
|
|
|
|
if not auth_events:
|
|
prev_state_ids = yield context.get_prev_state_ids(self.store)
|
|
auth_events_ids = yield self.auth.compute_auth_events(
|
|
event, prev_state_ids, for_verification=True
|
|
)
|
|
auth_events = yield self.store.get_events(auth_events_ids)
|
|
auth_events = {(e.type, e.state_key): e for e in auth_events.values()}
|
|
|
|
# This is a hack to fix some old rooms where the initial join event
|
|
# didn't reference the create event in its auth events.
|
|
if event.type == EventTypes.Member and not event.auth_event_ids():
|
|
if len(event.prev_event_ids()) == 1 and event.depth < 5:
|
|
c = yield self.store.get_event(
|
|
event.prev_event_ids()[0], allow_none=True
|
|
)
|
|
if c and c.type == EventTypes.Create:
|
|
auth_events[(c.type, c.state_key)] = c
|
|
|
|
context = yield self.do_auth(origin, event, context, auth_events=auth_events)
|
|
|
|
if not context.rejected:
|
|
yield self._check_for_soft_fail(event, state, backfilled)
|
|
|
|
if event.type == EventTypes.GuestAccess and not context.rejected:
|
|
yield self.maybe_kick_guest_users(event)
|
|
|
|
return context
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_for_soft_fail(self, event, state, backfilled):
|
|
"""Checks if we should soft fail the event, if so marks the event as
|
|
such.
|
|
|
|
Args:
|
|
event (FrozenEvent)
|
|
state (dict|None): The state at the event if we don't have all the
|
|
event's prev events
|
|
backfilled (bool): Whether the event is from backfill
|
|
|
|
Returns:
|
|
Deferred
|
|
"""
|
|
# For new (non-backfilled and non-outlier) events we check if the event
|
|
# passes auth based on the current state. If it doesn't then we
|
|
# "soft-fail" the event.
|
|
do_soft_fail_check = not backfilled and not event.internal_metadata.is_outlier()
|
|
if do_soft_fail_check:
|
|
extrem_ids = yield self.store.get_latest_event_ids_in_room(event.room_id)
|
|
|
|
extrem_ids = set(extrem_ids)
|
|
prev_event_ids = set(event.prev_event_ids())
|
|
|
|
if extrem_ids == prev_event_ids:
|
|
# If they're the same then the current state is the same as the
|
|
# state at the event, so no point rechecking auth for soft fail.
|
|
do_soft_fail_check = False
|
|
|
|
if do_soft_fail_check:
|
|
room_version = yield self.store.get_room_version(event.room_id)
|
|
|
|
# Calculate the "current state".
|
|
if state is not None:
|
|
# If we're explicitly given the state then we won't have all the
|
|
# prev events, and so we have a gap in the graph. In this case
|
|
# we want to be a little careful as we might have been down for
|
|
# a while and have an incorrect view of the current state,
|
|
# however we still want to do checks as gaps are easy to
|
|
# maliciously manufacture.
|
|
#
|
|
# So we use a "current state" that is actually a state
|
|
# resolution across the current forward extremities and the
|
|
# given state at the event. This should correctly handle cases
|
|
# like bans, especially with state res v2.
|
|
|
|
state_sets = yield self.state_store.get_state_groups(
|
|
event.room_id, extrem_ids
|
|
)
|
|
state_sets = list(state_sets.values())
|
|
state_sets.append(state)
|
|
current_state_ids = yield self.state_handler.resolve_events(
|
|
room_version, state_sets, event
|
|
)
|
|
current_state_ids = {
|
|
k: e.event_id for k, e in iteritems(current_state_ids)
|
|
}
|
|
else:
|
|
current_state_ids = yield self.state_handler.get_current_state_ids(
|
|
event.room_id, latest_event_ids=extrem_ids
|
|
)
|
|
|
|
logger.debug(
|
|
"Doing soft-fail check for %s: state %s",
|
|
event.event_id,
|
|
current_state_ids,
|
|
)
|
|
|
|
# Now check if event pass auth against said current state
|
|
auth_types = auth_types_for_event(event)
|
|
current_state_ids = [
|
|
e for k, e in iteritems(current_state_ids) if k in auth_types
|
|
]
|
|
|
|
current_auth_events = yield self.store.get_events(current_state_ids)
|
|
current_auth_events = {
|
|
(e.type, e.state_key): e for e in current_auth_events.values()
|
|
}
|
|
|
|
try:
|
|
event_auth.check(room_version, event, auth_events=current_auth_events)
|
|
except AuthError as e:
|
|
logger.warning("Soft-failing %r because %s", event, e)
|
|
event.internal_metadata.soft_failed = True
|
|
|
|
@defer.inlineCallbacks
|
|
def on_query_auth(
|
|
self, origin, event_id, room_id, remote_auth_chain, rejects, missing
|
|
):
|
|
in_room = yield self.auth.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
event = yield self.store.get_event(
|
|
event_id, allow_none=False, check_room_id=room_id
|
|
)
|
|
|
|
# Just go through and process each event in `remote_auth_chain`. We
|
|
# don't want to fall into the trap of `missing` being wrong.
|
|
for e in remote_auth_chain:
|
|
try:
|
|
yield self._handle_new_event(origin, e)
|
|
except AuthError:
|
|
pass
|
|
|
|
# Now get the current auth_chain for the event.
|
|
local_auth_chain = yield self.store.get_auth_chain(
|
|
[auth_id for auth_id in event.auth_event_ids()], include_given=True
|
|
)
|
|
|
|
# TODO: Check if we would now reject event_id. If so we need to tell
|
|
# everyone.
|
|
|
|
ret = yield self.construct_auth_difference(local_auth_chain, remote_auth_chain)
|
|
|
|
logger.debug("on_query_auth returning: %s", ret)
|
|
|
|
return ret
|
|
|
|
@defer.inlineCallbacks
|
|
def on_get_missing_events(
|
|
self, origin, room_id, earliest_events, latest_events, limit
|
|
):
|
|
in_room = yield self.auth.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
limit = min(limit, 20)
|
|
|
|
missing_events = yield self.store.get_missing_events(
|
|
room_id=room_id,
|
|
earliest_events=earliest_events,
|
|
latest_events=latest_events,
|
|
limit=limit,
|
|
)
|
|
|
|
missing_events = yield filter_events_for_server(
|
|
self.storage, origin, missing_events
|
|
)
|
|
|
|
return missing_events
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def do_auth(self, origin, event, context, auth_events):
|
|
"""
|
|
|
|
Args:
|
|
origin (str):
|
|
event (synapse.events.EventBase):
|
|
context (synapse.events.snapshot.EventContext):
|
|
auth_events (dict[(str, str)->synapse.events.EventBase]):
|
|
Map from (event_type, state_key) to event
|
|
|
|
Normally, our calculated auth_events based on the state of the room
|
|
at the event's position in the DAG, though occasionally (eg if the
|
|
event is an outlier), may be the auth events claimed by the remote
|
|
server.
|
|
|
|
Also NB that this function adds entries to it.
|
|
Returns:
|
|
defer.Deferred[EventContext]: updated context object
|
|
"""
|
|
room_version = yield self.store.get_room_version(event.room_id)
|
|
|
|
try:
|
|
context = yield self._update_auth_events_and_context_for_auth(
|
|
origin, event, context, auth_events
|
|
)
|
|
except Exception:
|
|
# We don't really mind if the above fails, so lets not fail
|
|
# processing if it does. However, it really shouldn't fail so
|
|
# let's still log as an exception since we'll still want to fix
|
|
# any bugs.
|
|
logger.exception(
|
|
"Failed to double check auth events for %s with remote. "
|
|
"Ignoring failure and continuing processing of event.",
|
|
event.event_id,
|
|
)
|
|
|
|
try:
|
|
event_auth.check(room_version, event, auth_events=auth_events)
|
|
except AuthError as e:
|
|
logger.warning("Failed auth resolution for %r because %s", event, e)
|
|
context.rejected = RejectedReason.AUTH_ERROR
|
|
|
|
return context
|
|
|
|
@defer.inlineCallbacks
|
|
def _update_auth_events_and_context_for_auth(
|
|
self, origin, event, context, auth_events
|
|
):
|
|
"""Helper for do_auth. See there for docs.
|
|
|
|
Checks whether a given event has the expected auth events. If it
|
|
doesn't then we talk to the remote server to compare state to see if
|
|
we can come to a consensus (e.g. if one server missed some valid
|
|
state).
|
|
|
|
This attempts to resovle any potential divergence of state between
|
|
servers, but is not essential and so failures should not block further
|
|
processing of the event.
|
|
|
|
Args:
|
|
origin (str):
|
|
event (synapse.events.EventBase):
|
|
context (synapse.events.snapshot.EventContext):
|
|
|
|
auth_events (dict[(str, str)->synapse.events.EventBase]):
|
|
Map from (event_type, state_key) to event
|
|
|
|
Normally, our calculated auth_events based on the state of the room
|
|
at the event's position in the DAG, though occasionally (eg if the
|
|
event is an outlier), may be the auth events claimed by the remote
|
|
server.
|
|
|
|
Also NB that this function adds entries to it.
|
|
|
|
Returns:
|
|
defer.Deferred[EventContext]: updated context
|
|
"""
|
|
event_auth_events = set(event.auth_event_ids())
|
|
|
|
# missing_auth is the set of the event's auth_events which we don't yet have
|
|
# in auth_events.
|
|
missing_auth = event_auth_events.difference(
|
|
e.event_id for e in auth_events.values()
|
|
)
|
|
|
|
# if we have missing events, we need to fetch those events from somewhere.
|
|
#
|
|
# we start by checking if they are in the store, and then try calling /event_auth/.
|
|
if missing_auth:
|
|
# TODO: can we use store.have_seen_events here instead?
|
|
have_events = yield self.store.get_seen_events_with_rejections(missing_auth)
|
|
logger.debug("Found events %s in the store", have_events)
|
|
missing_auth.difference_update(have_events.keys())
|
|
else:
|
|
have_events = {}
|
|
|
|
have_events.update({e.event_id: "" for e in auth_events.values()})
|
|
|
|
if missing_auth:
|
|
# If we don't have all the auth events, we need to get them.
|
|
logger.info("auth_events contains unknown events: %s", missing_auth)
|
|
try:
|
|
try:
|
|
remote_auth_chain = yield self.federation_client.get_event_auth(
|
|
origin, event.room_id, event.event_id
|
|
)
|
|
except RequestSendFailed as e:
|
|
# The other side isn't around or doesn't implement the
|
|
# endpoint, so lets just bail out.
|
|
logger.info("Failed to get event auth from remote: %s", e)
|
|
return context
|
|
|
|
seen_remotes = yield self.store.have_seen_events(
|
|
[e.event_id for e in remote_auth_chain]
|
|
)
|
|
|
|
for e in remote_auth_chain:
|
|
if e.event_id in seen_remotes:
|
|
continue
|
|
|
|
if e.event_id == event.event_id:
|
|
continue
|
|
|
|
try:
|
|
auth_ids = e.auth_event_ids()
|
|
auth = {
|
|
(e.type, e.state_key): e
|
|
for e in remote_auth_chain
|
|
if e.event_id in auth_ids or e.type == EventTypes.Create
|
|
}
|
|
e.internal_metadata.outlier = True
|
|
|
|
logger.debug(
|
|
"do_auth %s missing_auth: %s", event.event_id, e.event_id
|
|
)
|
|
yield self._handle_new_event(origin, e, auth_events=auth)
|
|
|
|
if e.event_id in event_auth_events:
|
|
auth_events[(e.type, e.state_key)] = e
|
|
except AuthError:
|
|
pass
|
|
|
|
have_events = yield self.store.get_seen_events_with_rejections(
|
|
event.auth_event_ids()
|
|
)
|
|
except Exception:
|
|
logger.exception("Failed to get auth chain")
|
|
|
|
if event.internal_metadata.is_outlier():
|
|
# XXX: given that, for an outlier, we'll be working with the
|
|
# event's *claimed* auth events rather than those we calculated:
|
|
# (a) is there any point in this test, since different_auth below will
|
|
# obviously be empty
|
|
# (b) alternatively, why don't we do it earlier?
|
|
logger.info("Skipping auth_event fetch for outlier")
|
|
return context
|
|
|
|
different_auth = event_auth_events.difference(
|
|
e.event_id for e in auth_events.values()
|
|
)
|
|
|
|
if not different_auth:
|
|
return context
|
|
|
|
logger.info(
|
|
"auth_events refers to events which are not in our calculated auth "
|
|
"chain: %s",
|
|
different_auth,
|
|
)
|
|
|
|
# now we state-resolve between our own idea of the auth events, and the remote's
|
|
# idea of them.
|
|
|
|
room_version = yield self.store.get_room_version(event.room_id)
|
|
different_event_ids = [
|
|
d for d in different_auth if d in have_events and not have_events[d]
|
|
]
|
|
|
|
if different_event_ids:
|
|
# XXX: currently this checks for redactions but I'm not convinced that is
|
|
# necessary?
|
|
different_events = yield self.store.get_events_as_list(different_event_ids)
|
|
|
|
local_view = dict(auth_events)
|
|
remote_view = dict(auth_events)
|
|
remote_view.update({(d.type, d.state_key): d for d in different_events})
|
|
|
|
new_state = yield self.state_handler.resolve_events(
|
|
room_version,
|
|
[list(local_view.values()), list(remote_view.values())],
|
|
event,
|
|
)
|
|
|
|
logger.info(
|
|
"After state res: updating auth_events with new state %s",
|
|
{
|
|
(d.type, d.state_key): d.event_id
|
|
for d in new_state.values()
|
|
if auth_events.get((d.type, d.state_key)) != d
|
|
},
|
|
)
|
|
|
|
auth_events.update(new_state)
|
|
|
|
context = yield self._update_context_for_auth_events(
|
|
event, context, auth_events
|
|
)
|
|
|
|
return context
|
|
|
|
@defer.inlineCallbacks
|
|
def _update_context_for_auth_events(self, event, context, auth_events):
|
|
"""Update the state_ids in an event context after auth event resolution,
|
|
storing the changes as a new state group.
|
|
|
|
Args:
|
|
event (Event): The event we're handling the context for
|
|
|
|
context (synapse.events.snapshot.EventContext): initial event context
|
|
|
|
auth_events (dict[(str, str)->EventBase]): Events to update in the event
|
|
context.
|
|
|
|
Returns:
|
|
Deferred[EventContext]: new event context
|
|
"""
|
|
# exclude the state key of the new event from the current_state in the context.
|
|
if event.is_state():
|
|
event_key = (event.type, event.state_key)
|
|
else:
|
|
event_key = None
|
|
state_updates = {
|
|
k: a.event_id for k, a in iteritems(auth_events) if k != event_key
|
|
}
|
|
|
|
current_state_ids = yield context.get_current_state_ids(self.store)
|
|
current_state_ids = dict(current_state_ids)
|
|
|
|
current_state_ids.update(state_updates)
|
|
|
|
prev_state_ids = yield context.get_prev_state_ids(self.store)
|
|
prev_state_ids = dict(prev_state_ids)
|
|
|
|
prev_state_ids.update({k: a.event_id for k, a in iteritems(auth_events)})
|
|
|
|
# create a new state group as a delta from the existing one.
|
|
prev_group = context.state_group
|
|
state_group = yield self.state_store.store_state_group(
|
|
event.event_id,
|
|
event.room_id,
|
|
prev_group=prev_group,
|
|
delta_ids=state_updates,
|
|
current_state_ids=current_state_ids,
|
|
)
|
|
|
|
return EventContext.with_state(
|
|
state_group=state_group,
|
|
state_group_before_event=context.state_group_before_event,
|
|
current_state_ids=current_state_ids,
|
|
prev_state_ids=prev_state_ids,
|
|
prev_group=prev_group,
|
|
delta_ids=state_updates,
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def construct_auth_difference(self, local_auth, remote_auth):
|
|
""" Given a local and remote auth chain, find the differences. This
|
|
assumes that we have already processed all events in remote_auth
|
|
|
|
Params:
|
|
local_auth (list)
|
|
remote_auth (list)
|
|
|
|
Returns:
|
|
dict
|
|
"""
|
|
|
|
logger.debug("construct_auth_difference Start!")
|
|
|
|
# TODO: Make sure we are OK with local_auth or remote_auth having more
|
|
# auth events in them than strictly necessary.
|
|
|
|
def sort_fun(ev):
|
|
return ev.depth, ev.event_id
|
|
|
|
logger.debug("construct_auth_difference after sort_fun!")
|
|
|
|
# We find the differences by starting at the "bottom" of each list
|
|
# and iterating up on both lists. The lists are ordered by depth and
|
|
# then event_id, we iterate up both lists until we find the event ids
|
|
# don't match. Then we look at depth/event_id to see which side is
|
|
# missing that event, and iterate only up that list. Repeat.
|
|
|
|
remote_list = list(remote_auth)
|
|
remote_list.sort(key=sort_fun)
|
|
|
|
local_list = list(local_auth)
|
|
local_list.sort(key=sort_fun)
|
|
|
|
local_iter = iter(local_list)
|
|
remote_iter = iter(remote_list)
|
|
|
|
logger.debug("construct_auth_difference before get_next!")
|
|
|
|
def get_next(it, opt=None):
|
|
try:
|
|
return next(it)
|
|
except Exception:
|
|
return opt
|
|
|
|
current_local = get_next(local_iter)
|
|
current_remote = get_next(remote_iter)
|
|
|
|
logger.debug("construct_auth_difference before while")
|
|
|
|
missing_remotes = []
|
|
missing_locals = []
|
|
while current_local or current_remote:
|
|
if current_remote is None:
|
|
missing_locals.append(current_local)
|
|
current_local = get_next(local_iter)
|
|
continue
|
|
|
|
if current_local is None:
|
|
missing_remotes.append(current_remote)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
if current_local.event_id == current_remote.event_id:
|
|
current_local = get_next(local_iter)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
if current_local.depth < current_remote.depth:
|
|
missing_locals.append(current_local)
|
|
current_local = get_next(local_iter)
|
|
continue
|
|
|
|
if current_local.depth > current_remote.depth:
|
|
missing_remotes.append(current_remote)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
# They have the same depth, so we fall back to the event_id order
|
|
if current_local.event_id < current_remote.event_id:
|
|
missing_locals.append(current_local)
|
|
current_local = get_next(local_iter)
|
|
|
|
if current_local.event_id > current_remote.event_id:
|
|
missing_remotes.append(current_remote)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
logger.debug("construct_auth_difference after while")
|
|
|
|
# missing locals should be sent to the server
|
|
# We should find why we are missing remotes, as they will have been
|
|
# rejected.
|
|
|
|
# Remove events from missing_remotes if they are referencing a missing
|
|
# remote. We only care about the "root" rejected ones.
|
|
missing_remote_ids = [e.event_id for e in missing_remotes]
|
|
base_remote_rejected = list(missing_remotes)
|
|
for e in missing_remotes:
|
|
for e_id in e.auth_event_ids():
|
|
if e_id in missing_remote_ids:
|
|
try:
|
|
base_remote_rejected.remove(e)
|
|
except ValueError:
|
|
pass
|
|
|
|
reason_map = {}
|
|
|
|
for e in base_remote_rejected:
|
|
reason = yield self.store.get_rejection_reason(e.event_id)
|
|
if reason is None:
|
|
# TODO: e is not in the current state, so we should
|
|
# construct some proof of that.
|
|
continue
|
|
|
|
reason_map[e.event_id] = reason
|
|
|
|
logger.debug("construct_auth_difference returning")
|
|
|
|
return {
|
|
"auth_chain": local_auth,
|
|
"rejects": {
|
|
e.event_id: {"reason": reason_map[e.event_id], "proof": None}
|
|
for e in base_remote_rejected
|
|
},
|
|
"missing": [e.event_id for e in missing_locals],
|
|
}
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def exchange_third_party_invite(
|
|
self, sender_user_id, target_user_id, room_id, signed
|
|
):
|
|
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 (yield self.auth.check_host_in_room(room_id, self.hs.hostname)):
|
|
room_version = yield self.store.get_room_version(room_id)
|
|
builder = self.event_builder_factory.new(room_version, event_dict)
|
|
|
|
EventValidator().validate_builder(builder)
|
|
event, context = yield self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
event_allowed = yield self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.info(
|
|
"Creation of threepid invite %s forbidden by third-party rules",
|
|
event,
|
|
)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
|
|
event, context = yield self.add_display_name_to_third_party_invite(
|
|
room_version, 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:
|
|
yield self.auth.check_from_context(room_version, event, context)
|
|
except AuthError as e:
|
|
logger.warning("Denying new third party invite %r because %s", event, e)
|
|
raise e
|
|
|
|
yield 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()
|
|
yield member_handler.send_membership_event(None, event, context)
|
|
else:
|
|
destinations = set(x.split(":", 1)[-1] for x in (sender_user_id, room_id))
|
|
yield self.federation_client.forward_third_party_invite(
|
|
destinations, room_id, event_dict
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_exchange_third_party_invite_request(self, room_id, event_dict):
|
|
"""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:
|
|
room_id (str): The ID of the room.
|
|
|
|
event_dict (dict[str, Any]): Dictionary containing the event body.
|
|
|
|
Returns:
|
|
Deferred: resolves (to None)
|
|
"""
|
|
room_version = yield self.store.get_room_version(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.new(room_version, event_dict)
|
|
|
|
event, context = yield self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
event_allowed = yield self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.warning(
|
|
"Exchange of threepid invite %s forbidden by third-party rules", event
|
|
)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
|
|
event, context = yield self.add_display_name_to_third_party_invite(
|
|
room_version, event_dict, event, context
|
|
)
|
|
|
|
try:
|
|
yield self.auth.check_from_context(room_version, event, context)
|
|
except AuthError as e:
|
|
logger.warning("Denying third party invite %r because %s", event, e)
|
|
raise e
|
|
yield 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()
|
|
yield member_handler.send_membership_event(None, event, context)
|
|
|
|
@defer.inlineCallbacks
|
|
def add_display_name_to_third_party_invite(
|
|
self, room_version, event_dict, event, context
|
|
):
|
|
key = (
|
|
EventTypes.ThirdPartyInvite,
|
|
event.content["third_party_invite"]["signed"]["token"],
|
|
)
|
|
original_invite = None
|
|
prev_state_ids = yield context.get_prev_state_ids(self.store)
|
|
original_invite_id = prev_state_ids.get(key)
|
|
if original_invite_id:
|
|
original_invite = yield 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.new(room_version, event_dict)
|
|
EventValidator().validate_builder(builder)
|
|
event, context = yield self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
EventValidator().validate_new(event, self.config)
|
|
return (event, context)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_signature(self, event, context):
|
|
"""
|
|
Checks that the signature in the event is consistent with its invite.
|
|
|
|
Args:
|
|
event (Event): The m.room.member event to check
|
|
context (EventContext):
|
|
|
|
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 = yield context.get_prev_state_ids(self.store)
|
|
invite_event_id = prev_state_ids.get((EventTypes.ThirdPartyInvite, token))
|
|
|
|
invite_event = None
|
|
if invite_event_id:
|
|
invite_event = yield 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 = None
|
|
# for each public key in the 3pid invite event
|
|
for public_key_object in self.hs.get_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, encoded_signature in signature_block.items():
|
|
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:
|
|
yield 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
|
|
raise last_exception
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_key_revocation(self, public_key, url):
|
|
"""
|
|
Checks whether public_key has been revoked.
|
|
|
|
Args:
|
|
public_key (str): base-64 encoded public key.
|
|
url (str): 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 = yield 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")
|
|
|
|
@defer.inlineCallbacks
|
|
def persist_events_and_notify(self, event_and_contexts, backfilled=False):
|
|
"""Persists events and tells the notifier/pushers about them, if
|
|
necessary.
|
|
|
|
Args:
|
|
event_and_contexts(list[tuple[FrozenEvent, EventContext]])
|
|
backfilled (bool): Whether these events are a result of
|
|
backfilling or not
|
|
|
|
Returns:
|
|
Deferred
|
|
"""
|
|
if self.config.worker_app:
|
|
yield self._send_events_to_master(
|
|
store=self.store,
|
|
event_and_contexts=event_and_contexts,
|
|
backfilled=backfilled,
|
|
)
|
|
else:
|
|
max_stream_id = yield self.storage.persistence.persist_events(
|
|
event_and_contexts, backfilled=backfilled
|
|
)
|
|
|
|
if self._ephemeral_messages_enabled:
|
|
for (event, context) in event_and_contexts:
|
|
# If there's an expiry timestamp on the event, schedule its expiry.
|
|
self._message_handler.maybe_schedule_expiry(event)
|
|
|
|
if not backfilled: # Never notify for backfilled events
|
|
for event, _ in event_and_contexts:
|
|
yield self._notify_persisted_event(event, max_stream_id)
|
|
|
|
def _notify_persisted_event(self, event, max_stream_id):
|
|
"""Checks to see if notifier/pushers should be notified about the
|
|
event or not.
|
|
|
|
Args:
|
|
event (FrozenEvent)
|
|
max_stream_id (int): The max_stream_id returned by persist_events
|
|
"""
|
|
|
|
extra_users = []
|
|
if event.type == EventTypes.Member:
|
|
target_user_id = event.state_key
|
|
|
|
# We notify for memberships if its an invite for one of our
|
|
# users
|
|
if event.internal_metadata.is_outlier():
|
|
if event.membership != Membership.INVITE:
|
|
if not self.is_mine_id(target_user_id):
|
|
return
|
|
|
|
target_user = UserID.from_string(target_user_id)
|
|
extra_users.append(target_user)
|
|
elif event.internal_metadata.is_outlier():
|
|
return
|
|
|
|
event_stream_id = event.internal_metadata.stream_ordering
|
|
self.notifier.on_new_room_event(
|
|
event, event_stream_id, max_stream_id, extra_users=extra_users
|
|
)
|
|
|
|
return self.pusher_pool.on_new_notifications(event_stream_id, max_stream_id)
|
|
|
|
def _clean_room_for_join(self, room_id):
|
|
"""Called to clean up any data in DB for a given room, ready for the
|
|
server to join the room.
|
|
|
|
Args:
|
|
room_id (str)
|
|
"""
|
|
if self.config.worker_app:
|
|
return self._clean_room_for_join_client(room_id)
|
|
else:
|
|
return self.store.clean_room_for_join(room_id)
|
|
|
|
def user_joined_room(self, user, room_id):
|
|
"""Called when a new user has joined the room
|
|
"""
|
|
if self.config.worker_app:
|
|
return self._notify_user_membership_change(
|
|
room_id=room_id, user_id=user.to_string(), change="joined"
|
|
)
|
|
else:
|
|
return user_joined_room(self.distributor, user, room_id)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_room_complexity(self, remote_room_hosts, room_id):
|
|
"""
|
|
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:
|
|
Deferred[dict] or Deferred[None]: Dict contains the complexity
|
|
metric versions, while None means we could not fetch the complexity.
|
|
"""
|
|
|
|
for host in remote_room_hosts:
|
|
res = yield self.federation_client.get_room_complexity(host, room_id)
|
|
|
|
# We got a result, return it.
|
|
if res:
|
|
defer.returnValue(res)
|
|
|
|
# We fell off the bottom, couldn't get the complexity from anyone. Oh
|
|
# well.
|
|
defer.returnValue(None)
|