704 lines
25 KiB
Python
704 lines
25 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 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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from twisted.internet import defer
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from .federation_base import FederationBase
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from .units import Transaction, Edu
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from synapse.util.async import Linearizer
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from synapse.util.logutils import log_function
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from synapse.util.caches.response_cache import ResponseCache
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from synapse.events import FrozenEvent
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from synapse.types import get_domain_from_id
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import synapse.metrics
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from synapse.api.errors import AuthError, FederationError, SynapseError
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from synapse.crypto.event_signing import compute_event_signature
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import simplejson as json
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import logging
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logger = logging.getLogger(__name__)
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# synapse.federation.federation_server is a silly name
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metrics = synapse.metrics.get_metrics_for("synapse.federation.server")
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received_pdus_counter = metrics.register_counter("received_pdus")
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received_edus_counter = metrics.register_counter("received_edus")
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received_queries_counter = metrics.register_counter("received_queries", labels=["type"])
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class FederationServer(FederationBase):
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def __init__(self, hs):
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super(FederationServer, self).__init__(hs)
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self.auth = hs.get_auth()
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self._room_pdu_linearizer = Linearizer("fed_room_pdu")
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self._server_linearizer = Linearizer("fed_server")
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# We cache responses to state queries, as they take a while and often
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# come in waves.
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self._state_resp_cache = ResponseCache(hs, timeout_ms=30000)
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def set_handler(self, handler):
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"""Sets the handler that the replication layer will use to communicate
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receipt of new PDUs from other home servers. The required methods are
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documented on :py:class:`.ReplicationHandler`.
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"""
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self.handler = handler
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def register_edu_handler(self, edu_type, handler):
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if edu_type in self.edu_handlers:
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raise KeyError("Already have an EDU handler for %s" % (edu_type,))
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self.edu_handlers[edu_type] = handler
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def register_query_handler(self, query_type, handler):
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"""Sets the handler callable that will be used to handle an incoming
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federation Query of the given type.
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Args:
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query_type (str): Category name of the query, which should match
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the string used by make_query.
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handler (callable): Invoked to handle incoming queries of this type
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handler is invoked as:
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result = handler(args)
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where 'args' is a dict mapping strings to strings of the query
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arguments. It should return a Deferred that will eventually yield an
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object to encode as JSON.
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"""
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if query_type in self.query_handlers:
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raise KeyError(
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"Already have a Query handler for %s" % (query_type,)
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)
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self.query_handlers[query_type] = handler
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@defer.inlineCallbacks
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@log_function
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def on_backfill_request(self, origin, room_id, versions, limit):
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with (yield self._server_linearizer.queue((origin, room_id))):
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pdus = yield self.handler.on_backfill_request(
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origin, room_id, versions, limit
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)
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res = self._transaction_from_pdus(pdus).get_dict()
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defer.returnValue((200, res))
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@defer.inlineCallbacks
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@log_function
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def on_incoming_transaction(self, transaction_data):
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transaction = Transaction(**transaction_data)
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received_pdus_counter.inc_by(len(transaction.pdus))
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for p in transaction.pdus:
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if "unsigned" in p:
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unsigned = p["unsigned"]
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if "age" in unsigned:
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p["age"] = unsigned["age"]
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if "age" in p:
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p["age_ts"] = int(self._clock.time_msec()) - int(p["age"])
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del p["age"]
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pdu_list = [
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self.event_from_pdu_json(p) for p in transaction.pdus
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]
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logger.debug("[%s] Got transaction", transaction.transaction_id)
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response = yield self.transaction_actions.have_responded(transaction)
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if response:
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logger.debug(
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"[%s] We've already responded to this request",
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transaction.transaction_id
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)
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defer.returnValue(response)
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return
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logger.debug("[%s] Transaction is new", transaction.transaction_id)
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results = []
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for pdu in pdu_list:
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# check that it's actually being sent from a valid destination to
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# workaround bug #1753 in 0.18.5 and 0.18.6
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if transaction.origin != get_domain_from_id(pdu.event_id):
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if not (
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pdu.type == 'm.room.member' and
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pdu.content and
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pdu.content.get("membership", None) == 'join' and
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self.hs.is_mine_id(pdu.state_key)
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):
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logger.info(
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"Discarding PDU %s from invalid origin %s",
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pdu.event_id, transaction.origin
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)
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continue
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else:
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logger.info(
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"Accepting join PDU %s from %s",
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pdu.event_id, transaction.origin
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)
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try:
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yield self._handle_new_pdu(transaction.origin, pdu)
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results.append({})
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except FederationError as e:
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self.send_failure(e, transaction.origin)
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results.append({"error": str(e)})
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except Exception as e:
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results.append({"error": str(e)})
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logger.exception("Failed to handle PDU")
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if hasattr(transaction, "edus"):
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for edu in (Edu(**x) for x in transaction.edus):
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yield self.received_edu(
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transaction.origin,
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edu.edu_type,
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edu.content
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)
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for failure in getattr(transaction, "pdu_failures", []):
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logger.info("Got failure %r", failure)
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logger.debug("Returning: %s", str(results))
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response = {
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"pdus": dict(zip(
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(p.event_id for p in pdu_list), results
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)),
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}
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yield self.transaction_actions.set_response(
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transaction,
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200, response
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)
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defer.returnValue((200, response))
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@defer.inlineCallbacks
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def received_edu(self, origin, edu_type, content):
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received_edus_counter.inc()
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if edu_type in self.edu_handlers:
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try:
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yield self.edu_handlers[edu_type](origin, content)
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except SynapseError as e:
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logger.info("Failed to handle edu %r: %r", edu_type, e)
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except Exception as e:
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logger.exception("Failed to handle edu %r", edu_type)
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else:
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logger.warn("Received EDU of type %s with no handler", edu_type)
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@defer.inlineCallbacks
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@log_function
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def on_context_state_request(self, origin, room_id, event_id):
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if not event_id:
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raise NotImplementedError("Specify an event")
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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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result = self._state_resp_cache.get((room_id, event_id))
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if not result:
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with (yield self._server_linearizer.queue((origin, room_id))):
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resp = yield self._state_resp_cache.set(
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(room_id, event_id),
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self._on_context_state_request_compute(room_id, event_id)
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)
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else:
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resp = yield result
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defer.returnValue((200, resp))
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@defer.inlineCallbacks
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def on_state_ids_request(self, origin, room_id, event_id):
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if not event_id:
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raise NotImplementedError("Specify an event")
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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_ids = yield self.handler.get_state_ids_for_pdu(
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room_id, event_id,
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)
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auth_chain_ids = yield self.store.get_auth_chain_ids(state_ids)
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defer.returnValue((200, {
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"pdu_ids": state_ids,
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"auth_chain_ids": auth_chain_ids,
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}))
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@defer.inlineCallbacks
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def _on_context_state_request_compute(self, room_id, event_id):
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pdus = yield self.handler.get_state_for_pdu(
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room_id, event_id,
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)
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auth_chain = yield self.store.get_auth_chain(
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[pdu.event_id for pdu in pdus]
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)
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for event in auth_chain:
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# We sign these again because there was a bug where we
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# incorrectly signed things the first time round
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if self.hs.is_mine_id(event.event_id):
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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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defer.returnValue({
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"pdus": [pdu.get_pdu_json() for pdu in pdus],
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"auth_chain": [pdu.get_pdu_json() for pdu in auth_chain],
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})
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@defer.inlineCallbacks
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@log_function
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def on_pdu_request(self, origin, event_id):
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pdu = yield self._get_persisted_pdu(origin, event_id)
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if pdu:
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defer.returnValue(
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(200, self._transaction_from_pdus([pdu]).get_dict())
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)
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else:
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defer.returnValue((404, ""))
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@defer.inlineCallbacks
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@log_function
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def on_pull_request(self, origin, versions):
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raise NotImplementedError("Pull transactions not implemented")
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@defer.inlineCallbacks
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def on_query_request(self, query_type, args):
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received_queries_counter.inc(query_type)
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if query_type in self.query_handlers:
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response = yield self.query_handlers[query_type](args)
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defer.returnValue((200, response))
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else:
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defer.returnValue(
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(404, "No handler for Query type '%s'" % (query_type,))
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)
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@defer.inlineCallbacks
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def on_make_join_request(self, room_id, user_id):
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pdu = yield self.handler.on_make_join_request(room_id, user_id)
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time_now = self._clock.time_msec()
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defer.returnValue({"event": pdu.get_pdu_json(time_now)})
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@defer.inlineCallbacks
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def on_invite_request(self, origin, content):
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pdu = self.event_from_pdu_json(content)
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ret_pdu = yield self.handler.on_invite_request(origin, pdu)
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time_now = self._clock.time_msec()
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defer.returnValue((200, {"event": ret_pdu.get_pdu_json(time_now)}))
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@defer.inlineCallbacks
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def on_send_join_request(self, origin, content):
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logger.debug("on_send_join_request: content: %s", content)
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pdu = self.event_from_pdu_json(content)
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logger.debug("on_send_join_request: pdu sigs: %s", pdu.signatures)
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res_pdus = yield self.handler.on_send_join_request(origin, pdu)
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time_now = self._clock.time_msec()
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defer.returnValue((200, {
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"state": [p.get_pdu_json(time_now) for p in res_pdus["state"]],
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"auth_chain": [
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p.get_pdu_json(time_now) for p in res_pdus["auth_chain"]
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],
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}))
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@defer.inlineCallbacks
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def on_make_leave_request(self, room_id, user_id):
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pdu = yield self.handler.on_make_leave_request(room_id, user_id)
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time_now = self._clock.time_msec()
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defer.returnValue({"event": pdu.get_pdu_json(time_now)})
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@defer.inlineCallbacks
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def on_send_leave_request(self, origin, content):
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logger.debug("on_send_leave_request: content: %s", content)
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pdu = self.event_from_pdu_json(content)
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logger.debug("on_send_leave_request: pdu sigs: %s", pdu.signatures)
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yield self.handler.on_send_leave_request(origin, pdu)
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defer.returnValue((200, {}))
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@defer.inlineCallbacks
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def on_event_auth(self, origin, room_id, event_id):
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with (yield self._server_linearizer.queue((origin, room_id))):
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time_now = self._clock.time_msec()
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auth_pdus = yield self.handler.on_event_auth(event_id)
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res = {
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"auth_chain": [a.get_pdu_json(time_now) for a in auth_pdus],
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}
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defer.returnValue((200, res))
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@defer.inlineCallbacks
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def on_query_auth_request(self, origin, content, room_id, event_id):
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"""
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Content is a dict with keys::
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auth_chain (list): A list of events that give the auth chain.
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missing (list): A list of event_ids indicating what the other
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side (`origin`) think we're missing.
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rejects (dict): A mapping from event_id to a 2-tuple of reason
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string and a proof (or None) of why the event was rejected.
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The keys of this dict give the list of events the `origin` has
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rejected.
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Args:
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origin (str)
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content (dict)
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event_id (str)
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Returns:
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Deferred: Results in `dict` with the same format as `content`
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"""
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with (yield self._server_linearizer.queue((origin, room_id))):
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auth_chain = [
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self.event_from_pdu_json(e)
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for e in content["auth_chain"]
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]
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signed_auth = yield self._check_sigs_and_hash_and_fetch(
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origin, auth_chain, outlier=True
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)
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ret = yield self.handler.on_query_auth(
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origin,
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event_id,
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signed_auth,
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content.get("rejects", []),
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content.get("missing", []),
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)
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time_now = self._clock.time_msec()
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send_content = {
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"auth_chain": [
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e.get_pdu_json(time_now)
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for e in ret["auth_chain"]
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],
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"rejects": ret.get("rejects", []),
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"missing": ret.get("missing", []),
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}
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defer.returnValue(
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(200, send_content)
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)
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@log_function
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def on_query_client_keys(self, origin, content):
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return self.on_query_request("client_keys", content)
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def on_query_user_devices(self, origin, user_id):
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return self.on_query_request("user_devices", user_id)
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@defer.inlineCallbacks
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@log_function
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def on_claim_client_keys(self, origin, content):
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query = []
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for user_id, device_keys in content.get("one_time_keys", {}).items():
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for device_id, algorithm in device_keys.items():
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query.append((user_id, device_id, algorithm))
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results = yield self.store.claim_e2e_one_time_keys(query)
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json_result = {}
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for user_id, device_keys in results.items():
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for device_id, keys in device_keys.items():
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for key_id, json_bytes in keys.items():
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json_result.setdefault(user_id, {})[device_id] = {
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key_id: json.loads(json_bytes)
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}
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defer.returnValue({"one_time_keys": json_result})
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@defer.inlineCallbacks
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@log_function
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def on_get_missing_events(self, origin, room_id, earliest_events,
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latest_events, limit, min_depth):
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with (yield self._server_linearizer.queue((origin, room_id))):
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logger.info(
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"on_get_missing_events: earliest_events: %r, latest_events: %r,"
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" limit: %d, min_depth: %d",
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earliest_events, latest_events, limit, min_depth
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)
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missing_events = yield self.handler.on_get_missing_events(
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origin, room_id, earliest_events, latest_events, limit, min_depth
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)
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if len(missing_events) < 5:
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logger.info(
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"Returning %d events: %r", len(missing_events), missing_events
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)
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else:
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logger.info("Returning %d events", len(missing_events))
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time_now = self._clock.time_msec()
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defer.returnValue({
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"events": [ev.get_pdu_json(time_now) for ev in missing_events],
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})
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@log_function
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def on_openid_userinfo(self, token):
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ts_now_ms = self._clock.time_msec()
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return self.store.get_user_id_for_open_id_token(token, ts_now_ms)
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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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return self.handler.get_persisted_pdu(
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origin, event_id, do_auth=do_auth
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)
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def _transaction_from_pdus(self, pdu_list):
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"""Returns a new Transaction containing the given PDUs suitable for
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transmission.
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"""
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time_now = self._clock.time_msec()
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pdus = [p.get_pdu_json(time_now) for p in pdu_list]
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return Transaction(
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origin=self.server_name,
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pdus=pdus,
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origin_server_ts=int(time_now),
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destination=None,
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)
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@defer.inlineCallbacks
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@log_function
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def _handle_new_pdu(self, origin, pdu, get_missing=True):
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# We reprocess pdus when we have seen them only as outliers
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existing = yield self._get_persisted_pdu(
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origin, pdu.event_id, do_auth=False
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)
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|
|
|
# FIXME: Currently we fetch an event again when we already have it
|
|
# if it has been marked as an outlier.
|
|
|
|
already_seen = (
|
|
existing and (
|
|
not existing.internal_metadata.is_outlier()
|
|
or pdu.internal_metadata.is_outlier()
|
|
)
|
|
)
|
|
if already_seen:
|
|
logger.debug("Already seen pdu %s", pdu.event_id)
|
|
return
|
|
|
|
# Check signature.
|
|
try:
|
|
pdu = yield self._check_sigs_and_hash(pdu)
|
|
except SynapseError as e:
|
|
raise FederationError(
|
|
"ERROR",
|
|
e.code,
|
|
e.msg,
|
|
affected=pdu.event_id,
|
|
)
|
|
|
|
state = None
|
|
|
|
auth_chain = []
|
|
|
|
have_seen = yield self.store.have_events(
|
|
[ev for ev, _ in pdu.prev_events]
|
|
)
|
|
|
|
fetch_state = False
|
|
|
|
# Get missing pdus if necessary.
|
|
if not pdu.internal_metadata.is_outlier():
|
|
# We only backfill backwards to the min depth.
|
|
min_depth = yield self.handler.get_min_depth_for_context(
|
|
pdu.room_id
|
|
)
|
|
|
|
logger.debug(
|
|
"_handle_new_pdu min_depth for %s: %d",
|
|
pdu.room_id, min_depth
|
|
)
|
|
|
|
prevs = {e_id for e_id, _ in pdu.prev_events}
|
|
seen = set(have_seen.keys())
|
|
|
|
if min_depth and pdu.depth < min_depth:
|
|
# This is so that we don't notify the user about this
|
|
# message, to work around the fact that some events will
|
|
# reference really really old events we really don't want to
|
|
# send to the clients.
|
|
pdu.internal_metadata.outlier = True
|
|
elif min_depth and pdu.depth > min_depth:
|
|
if get_missing and prevs - seen:
|
|
# If we're missing stuff, ensure we only fetch stuff one
|
|
# at a time.
|
|
logger.info(
|
|
"Acquiring lock for room %r to fetch %d missing events: %r...",
|
|
pdu.room_id, len(prevs - seen), list(prevs - seen)[:5],
|
|
)
|
|
with (yield self._room_pdu_linearizer.queue(pdu.room_id)):
|
|
logger.info(
|
|
"Acquired lock for room %r to fetch %d missing events",
|
|
pdu.room_id, len(prevs - seen),
|
|
)
|
|
|
|
# We recalculate seen, since it may have changed.
|
|
have_seen = yield self.store.have_events(prevs)
|
|
seen = set(have_seen.keys())
|
|
|
|
if prevs - seen:
|
|
latest = yield self.store.get_latest_event_ids_in_room(
|
|
pdu.room_id
|
|
)
|
|
|
|
# We add the prev events that we have seen to the latest
|
|
# list to ensure the remote server doesn't give them to us
|
|
latest = set(latest)
|
|
latest |= seen
|
|
|
|
logger.info(
|
|
"Missing %d events for room %r: %r...",
|
|
len(prevs - seen), pdu.room_id, list(prevs - seen)[:5]
|
|
)
|
|
|
|
# XXX: we set timeout to 10s to help workaround
|
|
# https://github.com/matrix-org/synapse/issues/1733.
|
|
# The reason is to avoid holding the linearizer lock
|
|
# whilst processing inbound /send transactions, causing
|
|
# FDs to stack up and block other inbound transactions
|
|
# which empirically can currently take up to 30 minutes.
|
|
#
|
|
# N.B. this explicitly disables retry attempts.
|
|
#
|
|
# N.B. this also increases our chances of falling back to
|
|
# fetching fresh state for the room if the missing event
|
|
# can't be found, which slightly reduces our security.
|
|
# it may also increase our DAG extremity count for the room,
|
|
# causing additional state resolution? See #1760.
|
|
# However, fetching state doesn't hold the linearizer lock
|
|
# apparently.
|
|
#
|
|
# see https://github.com/matrix-org/synapse/pull/1744
|
|
|
|
missing_events = yield self.get_missing_events(
|
|
origin,
|
|
pdu.room_id,
|
|
earliest_events_ids=list(latest),
|
|
latest_events=[pdu],
|
|
limit=10,
|
|
min_depth=min_depth,
|
|
timeout=10000,
|
|
)
|
|
|
|
# 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 e in missing_events:
|
|
yield self._handle_new_pdu(
|
|
origin,
|
|
e,
|
|
get_missing=False
|
|
)
|
|
|
|
have_seen = yield self.store.have_events(
|
|
[ev for ev, _ in pdu.prev_events]
|
|
)
|
|
|
|
prevs = {e_id for e_id, _ in pdu.prev_events}
|
|
seen = set(have_seen.keys())
|
|
if prevs - seen:
|
|
logger.info(
|
|
"Still missing %d events for room %r: %r...",
|
|
len(prevs - seen), pdu.room_id, list(prevs - seen)[:5]
|
|
)
|
|
fetch_state = True
|
|
|
|
if fetch_state:
|
|
# We need to get the state at this event, since we haven't
|
|
# processed all the prev events.
|
|
logger.debug(
|
|
"_handle_new_pdu getting state for %s",
|
|
pdu.room_id
|
|
)
|
|
try:
|
|
state, auth_chain = yield self.get_state_for_room(
|
|
origin, pdu.room_id, pdu.event_id,
|
|
)
|
|
except:
|
|
logger.exception("Failed to get state for event: %s", pdu.event_id)
|
|
|
|
yield self.handler.on_receive_pdu(
|
|
origin,
|
|
pdu,
|
|
state=state,
|
|
auth_chain=auth_chain,
|
|
)
|
|
|
|
def __str__(self):
|
|
return "<ReplicationLayer(%s)>" % self.server_name
|
|
|
|
def event_from_pdu_json(self, pdu_json, outlier=False):
|
|
event = FrozenEvent(
|
|
pdu_json
|
|
)
|
|
|
|
event.internal_metadata.outlier = outlier
|
|
|
|
return event
|
|
|
|
@defer.inlineCallbacks
|
|
def exchange_third_party_invite(
|
|
self,
|
|
sender_user_id,
|
|
target_user_id,
|
|
room_id,
|
|
signed,
|
|
):
|
|
ret = yield self.handler.exchange_third_party_invite(
|
|
sender_user_id,
|
|
target_user_id,
|
|
room_id,
|
|
signed,
|
|
)
|
|
defer.returnValue(ret)
|
|
|
|
@defer.inlineCallbacks
|
|
def on_exchange_third_party_invite_request(self, origin, room_id, event_dict):
|
|
ret = yield self.handler.on_exchange_third_party_invite_request(
|
|
origin, room_id, event_dict
|
|
)
|
|
defer.returnValue(ret)
|