624 lines
19 KiB
Python
624 lines
19 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 OpenMarket Ltd
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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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from ._base import BaseHandler
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from synapse.api.events.utils import prune_event
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from synapse.api.errors import AuthError, FederationError, SynapseError
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from synapse.api.events.room import RoomMemberEvent
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from synapse.api.constants import Membership
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from synapse.util.logutils import log_function
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from synapse.util.async import run_on_reactor
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from synapse.crypto.event_signing import (
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compute_event_signature, check_event_content_hash,
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add_hashes_and_signatures,
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)
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from syutil.jsonutil import encode_canonical_json
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from twisted.internet import defer
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import logging
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logger = logging.getLogger(__name__)
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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 home server (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 home servers.
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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.distributor.observe(
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"user_joined_room",
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self._on_user_joined
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)
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self.waiting_for_join_list = {}
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self.store = hs.get_datastore()
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self.replication_layer = hs.get_replication_layer()
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self.state_handler = hs.get_state_handler()
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# self.auth_handler = gs.get_auth_handler()
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self.server_name = hs.hostname
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self.keyring = hs.get_keyring()
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self.lock_manager = hs.get_room_lock_manager()
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self.replication_layer.set_handler(self)
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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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@log_function
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@defer.inlineCallbacks
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def handle_new_event(self, event, snapshot):
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""" Takes in an event from the client to server side, that has already
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been authed and handled by the state module, and sends it to any
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remote home servers that may be interested.
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Args:
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event
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snapshot (.storage.Snapshot): THe snapshot the event happened after
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Returns:
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Deferred: Resolved when it has successfully been queued for
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processing.
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"""
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yield run_on_reactor()
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pdu = event
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if not hasattr(pdu, "destinations") or not pdu.destinations:
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pdu.destinations = []
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yield self.replication_layer.send_pdu(pdu)
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@log_function
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@defer.inlineCallbacks
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def on_receive_pdu(self, pdu, backfilled, state=None):
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""" Called by the ReplicationLayer when we have a new pdu. We need to
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do auth checks and put it through the StateHandler.
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"""
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event = pdu
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logger.debug("Got event: %s", event.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 event.room_id in self.room_queues:
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self.room_queues[event.room_id].append(pdu)
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return
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logger.debug("Processing event: %s", event.event_id)
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redacted_event = prune_event(event)
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redacted_pdu_json = redacted_event.get_pdu_json()
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try:
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yield self.keyring.verify_json_for_server(
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event.origin, redacted_pdu_json
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)
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except SynapseError as e:
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logger.warn(
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"Signature check failed for %s redacted to %s",
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encode_canonical_json(pdu.get_pdu_json()),
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encode_canonical_json(redacted_pdu_json),
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)
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raise FederationError(
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"ERROR",
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e.code,
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e.msg,
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affected=event.event_id,
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)
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if not check_event_content_hash(event):
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logger.warn(
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"Event content has been tampered, redacting %s, %s",
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event.event_id, encode_canonical_json(event.get_full_dict())
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)
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event = redacted_event
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logger.debug("Event: %s", event)
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# FIXME (erikj): Awful hack to make the case where we are not currently
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# in the room work
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current_state = None
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if state:
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is_in_room = yield self.auth.check_host_in_room(
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event.room_id,
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self.server_name
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)
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if not is_in_room:
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logger.debug("Got event for room we're not in.")
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current_state = state
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try:
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yield self._handle_new_event(
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event,
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state=state,
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backfilled=backfilled,
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current_state=current_state,
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)
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except AuthError as e:
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raise FederationError(
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"ERROR",
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e.code,
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e.msg,
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affected=event.event_id,
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)
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room = yield self.store.get_room(event.room_id)
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if not room:
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yield self.store.store_room(
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room_id=event.room_id,
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room_creator_user_id="",
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is_public=False,
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)
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if not backfilled:
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extra_users = []
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if event.type == RoomMemberEvent.TYPE:
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target_user_id = event.state_key
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target_user = self.hs.parse_userid(target_user_id)
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extra_users.append(target_user)
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yield self.notifier.on_new_room_event(
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event, extra_users=extra_users
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)
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if event.type == RoomMemberEvent.TYPE:
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if event.membership == Membership.JOIN:
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user = self.hs.parse_userid(event.state_key)
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yield self.distributor.fire(
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"user_joined_room", user=user, room_id=event.room_id
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)
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@log_function
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@defer.inlineCallbacks
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def backfill(self, dest, room_id, limit):
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""" Trigger a backfill request to `dest` for the given `room_id`
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"""
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extremities = yield self.store.get_oldest_events_in_room(room_id)
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pdus = yield self.replication_layer.backfill(
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dest,
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room_id,
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limit,
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extremities=extremities,
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)
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events = []
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for pdu in pdus:
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event = pdu
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# FIXME (erikj): Not sure this actually works :/
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yield self.state_handler.annotate_event_with_state(event)
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events.append(event)
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yield self.store.persist_event(event, backfilled=True)
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defer.returnValue(events)
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@defer.inlineCallbacks
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def send_invite(self, target_host, event):
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""" Sends the invite to the remote server for signing.
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Invites must be signed by the invitee's server before distribution.
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"""
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pdu = yield self.replication_layer.send_invite(
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destination=target_host,
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context=event.room_id,
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event_id=event.event_id,
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pdu=event
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)
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defer.returnValue(pdu)
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@defer.inlineCallbacks
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def on_event_auth(self, event_id):
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auth = yield self.store.get_auth_chain(event_id)
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defer.returnValue([e for e in auth])
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@log_function
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@defer.inlineCallbacks
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def do_invite_join(self, target_host, room_id, joinee, content, snapshot):
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""" Attempts to join the `joinee` to the room `room_id` via the
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server `target_host`.
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This first triggers a /make_join/ request that returns a partial
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event that we can fill out and sign. This is then sent to the
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remote server via /send_join/ which responds with the state at that
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event and the auth_chains.
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We suspend processing of any received events from this room until we
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have finished processing the join.
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"""
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logger.debug("Joining %s to %s", joinee, room_id)
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pdu = yield self.replication_layer.make_join(
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target_host,
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room_id,
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joinee
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)
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logger.debug("Got response to make_join: %s", pdu)
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event = pdu
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# We should assert some things.
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assert(event.type == RoomMemberEvent.TYPE)
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assert(event.user_id == joinee)
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assert(event.state_key == joinee)
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assert(event.room_id == room_id)
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event.outlier = False
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self.room_queues[room_id] = []
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try:
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event.event_id = self.event_factory.create_event_id()
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event.origin = self.hs.hostname
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event.content = content
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if not hasattr(event, "signatures"):
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event.signatures = {}
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add_hashes_and_signatures(
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event,
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self.hs.hostname,
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self.hs.config.signing_key[0],
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)
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ret = yield self.replication_layer.send_join(
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target_host,
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event
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)
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state = ret["state"]
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auth_chain = ret["auth_chain"]
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logger.debug("do_invite_join auth_chain: %s", auth_chain)
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logger.debug("do_invite_join state: %s", state)
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logger.debug("do_invite_join event: %s", event)
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try:
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yield self.store.store_room(
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room_id=room_id,
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room_creator_user_id="",
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is_public=False
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)
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except:
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# FIXME
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pass
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for e in auth_chain:
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e.outlier = True
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yield self._handle_new_event(e)
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yield self.notifier.on_new_room_event(
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e, extra_users=[joinee]
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)
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for e in state:
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# FIXME: Auth these.
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e.outlier = True
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yield self._handle_new_event(e)
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yield self.notifier.on_new_room_event(
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e, extra_users=[joinee]
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)
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yield self._handle_new_event(
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event,
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state=state,
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current_state=state
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)
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yield self.notifier.on_new_room_event(
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event, extra_users=[joinee]
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)
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logger.debug("Finished joining %s to %s", joinee, room_id)
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finally:
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room_queue = self.room_queues[room_id]
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del self.room_queues[room_id]
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for p in room_queue:
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try:
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self.on_receive_pdu(p, backfilled=False)
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except:
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logger.exception("Couldn't handle pdu")
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defer.returnValue(True)
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@defer.inlineCallbacks
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@log_function
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def on_make_join_request(self, context, user_id):
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""" We've received a /make_join/ request, so we create a partial
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join event for the room and return that. We don *not* persist or
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process it until the other server has signed it and sent it back.
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"""
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event = self.event_factory.create_event(
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etype=RoomMemberEvent.TYPE,
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content={"membership": Membership.JOIN},
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room_id=context,
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user_id=user_id,
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state_key=user_id,
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)
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snapshot = yield self.store.snapshot_room(event)
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snapshot.fill_out_prev_events(event)
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yield self.state_handler.annotate_event_with_state(event)
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yield self.auth.add_auth_events(event)
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self.auth.check(event, auth_events=event.old_state_events)
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pdu = event
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defer.returnValue(pdu)
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@defer.inlineCallbacks
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@log_function
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def on_send_join_request(self, origin, pdu):
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""" We have received a join event for a room. Fully process it and
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respond with the current state and auth chains.
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"""
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event = pdu
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event.outlier = False
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yield self._handle_new_event(event)
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extra_users = []
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if event.type == RoomMemberEvent.TYPE:
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target_user_id = event.state_key
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target_user = self.hs.parse_userid(target_user_id)
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extra_users.append(target_user)
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yield self.notifier.on_new_room_event(
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event, extra_users=extra_users
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)
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if event.type == RoomMemberEvent.TYPE:
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if event.content["membership"] == Membership.JOIN:
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user = self.hs.parse_userid(event.state_key)
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yield self.distributor.fire(
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"user_joined_room", user=user, room_id=event.room_id
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)
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new_pdu = event
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destinations = set()
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for k, s in event.state_events.items():
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try:
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if k[0] == RoomMemberEvent.TYPE:
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if s.content["membership"] == Membership.JOIN:
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destinations.add(
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self.hs.parse_userid(s.state_key).domain
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)
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except:
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logger.warn(
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"Failed to get destination from event %s", s.event_id
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)
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new_pdu.destinations = list(destinations)
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yield self.replication_layer.send_pdu(new_pdu)
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auth_chain = yield self.store.get_auth_chain(event.event_id)
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defer.returnValue({
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"state": event.state_events.values(),
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"auth_chain": auth_chain,
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})
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@defer.inlineCallbacks
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def on_invite_request(self, origin, pdu):
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""" We've got an invite event. Process and persist it. Sign it.
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Respond with the now signed event.
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"""
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event = pdu
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event.outlier = True
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event.signatures.update(
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compute_event_signature(
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event,
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self.hs.hostname,
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self.hs.config.signing_key[0]
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)
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)
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yield self.state_handler.annotate_event_with_state(event)
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yield self.store.persist_event(
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event,
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backfilled=False,
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)
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target_user = self.hs.parse_userid(event.state_key)
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yield self.notifier.on_new_room_event(
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event, extra_users=[target_user],
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)
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defer.returnValue(event)
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@defer.inlineCallbacks
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def get_state_for_pdu(self, origin, room_id, event_id):
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yield run_on_reactor()
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in_room = yield self.auth.check_host_in_room(room_id, origin)
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if not in_room:
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raise AuthError(403, "Host not in room.")
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state_groups = yield self.store.get_state_groups(
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[event_id]
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)
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if state_groups:
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_, state = state_groups.items().pop()
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results = {
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(e.type, e.state_key): e for e in state
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}
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event = yield self.store.get_event(event_id)
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if hasattr(event, "state_key"):
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# Get previous state
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if hasattr(event, "replaces_state") and event.replaces_state:
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prev_event = yield self.store.get_event(
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event.replaces_state
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)
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results[(event.type, event.state_key)] = prev_event
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else:
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del results[(event.type, event.state_key)]
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defer.returnValue(results.values())
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else:
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defer.returnValue([])
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@defer.inlineCallbacks
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@log_function
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def on_backfill_request(self, origin, context, pdu_list, limit):
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in_room = yield self.auth.check_host_in_room(context, origin)
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if not in_room:
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raise AuthError(403, "Host not in room.")
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events = yield self.store.get_backfill_events(
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context,
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pdu_list,
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limit
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)
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defer.returnValue(events)
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@defer.inlineCallbacks
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@log_function
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def get_persisted_pdu(self, origin, event_id, do_auth=True):
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""" Get a PDU from the database with given origin and id.
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Returns:
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Deferred: Results in a `Pdu`.
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"""
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event = yield self.store.get_event(
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event_id,
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allow_none=True,
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)
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if event:
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if do_auth:
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in_room = yield self.auth.check_host_in_room(
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event.room_id,
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origin
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)
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if not in_room:
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raise AuthError(403, "Host not in room.")
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defer.returnValue(event)
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else:
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defer.returnValue(None)
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@log_function
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def get_min_depth_for_context(self, context):
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return self.store.get_min_depth(context)
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@log_function
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def _on_user_joined(self, user, room_id):
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waiters = self.waiting_for_join_list.get(
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(user.to_string(), room_id),
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[]
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)
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while waiters:
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waiters.pop().callback(None)
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|
|
@defer.inlineCallbacks
|
|
def _handle_new_event(self, event, state=None, backfilled=False,
|
|
current_state=None):
|
|
if state:
|
|
for s in state:
|
|
yield self._handle_new_event(s)
|
|
|
|
is_new_state = yield self.state_handler.annotate_event_with_state(
|
|
event,
|
|
old_state=state
|
|
)
|
|
|
|
if event.old_state_events:
|
|
known_ids = set(
|
|
[s.event_id for s in event.old_state_events.values()]
|
|
)
|
|
for e_id, _ in event.auth_events:
|
|
if e_id not in known_ids:
|
|
e = yield self.store.get_event(
|
|
e_id,
|
|
allow_none=True,
|
|
)
|
|
|
|
if not e:
|
|
# TODO: Do some conflict res to make sure that we're
|
|
# not the ones who are wrong.
|
|
logger.info(
|
|
"Rejecting %s as %s not in %s",
|
|
event.event_id, e_id, known_ids,
|
|
)
|
|
raise AuthError(403, "Auth events are stale")
|
|
|
|
auth_events = event.old_state_events
|
|
else:
|
|
# We need to get the auth events from somewhere.
|
|
|
|
# TODO: Don't just hit the DBs?
|
|
|
|
auth_events = {}
|
|
for e_id, _ in event.auth_events:
|
|
e = yield self.store.get_event(
|
|
e_id,
|
|
allow_none=True,
|
|
)
|
|
|
|
if not e:
|
|
raise AuthError(
|
|
403,
|
|
"Can't find auth event %s." % (e_id, )
|
|
)
|
|
|
|
auth_events[(e.type, e.state_key)] = e
|
|
|
|
self.auth.check(event, auth_events=auth_events)
|
|
|
|
yield self.store.persist_event(
|
|
event,
|
|
backfilled=backfilled,
|
|
is_new_state=(is_new_state and not backfilled),
|
|
current_state=current_state,
|
|
)
|