652 lines
24 KiB
Python
652 lines
24 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 OpenMarket Ltd
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# Copyright 2018 New Vector 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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import logging
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import simplejson as json
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from twisted.internet import defer
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from synapse.api.errors import AuthError, FederationError, SynapseError, NotFoundError
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from synapse.crypto.event_signing import compute_event_signature
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from synapse.federation.federation_base import (
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FederationBase,
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event_from_pdu_json,
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)
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from synapse.federation.persistence import TransactionActions
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from synapse.federation.units import Edu, Transaction
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import synapse.metrics
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from synapse.types import get_domain_from_id
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from synapse.util import async
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from synapse.util.caches.response_cache import ResponseCache
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from synapse.util.logutils import log_function
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from six import iteritems
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# when processing incoming transactions, we try to handle multiple rooms in
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# parallel, up to this limit.
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TRANSACTION_CONCURRENCY_LIMIT = 10
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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.handler = hs.get_handlers().federation_handler
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self._server_linearizer = async.Linearizer("fed_server")
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self._transaction_linearizer = async.Linearizer("fed_txn_handler")
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self.transaction_actions = TransactionActions(self.store)
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self.registry = hs.get_federation_registry()
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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, "state_resp", timeout_ms=30000)
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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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# keep this as early as possible to make the calculated origin ts as
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# accurate as possible.
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request_time = self._clock.time_msec()
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transaction = Transaction(**transaction_data)
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if not transaction.transaction_id:
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raise Exception("Transaction missing transaction_id")
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if not transaction.origin:
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raise Exception("Transaction missing origin")
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logger.debug("[%s] Got transaction", transaction.transaction_id)
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# use a linearizer to ensure that we don't process the same transaction
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# multiple times in parallel.
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with (yield self._transaction_linearizer.queue(
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(transaction.origin, transaction.transaction_id),
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)):
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result = yield self._handle_incoming_transaction(
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transaction, request_time,
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)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _handle_incoming_transaction(self, transaction, request_time):
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""" Process an incoming transaction and return the HTTP response
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Args:
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transaction (Transaction): incoming transaction
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request_time (int): timestamp that the HTTP request arrived at
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Returns:
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Deferred[(int, object)]: http response code and body
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"""
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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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received_pdus_counter.inc_by(len(transaction.pdus))
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pdus_by_room = {}
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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"] = request_time - int(p["age"])
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del p["age"]
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event = event_from_pdu_json(p)
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room_id = event.room_id
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pdus_by_room.setdefault(room_id, []).append(event)
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pdu_results = {}
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# we can process different rooms in parallel (which is useful if they
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# require callouts to other servers to fetch missing events), but
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# impose a limit to avoid going too crazy with ram/cpu.
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@defer.inlineCallbacks
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def process_pdus_for_room(room_id):
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logger.debug("Processing PDUs for %s", room_id)
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for pdu in pdus_by_room[room_id]:
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event_id = pdu.event_id
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try:
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yield self._handle_received_pdu(
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transaction.origin, pdu
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)
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pdu_results[event_id] = {}
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except FederationError as e:
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logger.warn("Error handling PDU %s: %s", event_id, e)
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pdu_results[event_id] = {"error": str(e)}
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except Exception as e:
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pdu_results[event_id] = {"error": str(e)}
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logger.exception("Failed to handle PDU %s", event_id)
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yield async.concurrently_execute(
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process_pdus_for_room, pdus_by_room.keys(),
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TRANSACTION_CONCURRENCY_LIMIT,
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)
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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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pdu_failures = getattr(transaction, "pdu_failures", [])
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for failure in pdu_failures:
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logger.info("Got failure %r", failure)
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response = {
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"pdus": pdu_results,
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}
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logger.debug("Returning: %s", str(response))
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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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yield self.registry.on_edu(edu_type, origin, content)
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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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# we grab the linearizer to protect ourselves from servers which hammer
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# us. In theory we might already have the response to this query
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# in the cache so we could return it without waiting for the linearizer
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# - but that's non-trivial to get right, and anyway somewhat defeats
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# the point of the linearizer.
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with (yield self._server_linearizer.queue((origin, room_id))):
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resp = yield self._state_resp_cache.wrap(
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(room_id, event_id),
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self._on_context_state_request_compute,
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room_id, event_id,
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)
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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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resp = yield self.registry.on_query(query_type, args)
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defer.returnValue((200, resp))
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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 = 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 = 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 = 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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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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logger.info(
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"Claimed one-time-keys: %s",
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",".join((
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"%s for %s:%s" % (key_id, user_id, device_id)
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for user_id, user_keys in iteritems(json_result)
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for device_id, device_keys in iteritems(user_keys)
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for key_id, _ in iteritems(device_keys)
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)),
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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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def _handle_received_pdu(self, origin, pdu):
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""" Process a PDU received in a federation /send/ transaction.
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If the event is invalid, then this method throws a FederationError.
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(The error will then be logged and sent back to the sender (which
|
|
probably won't do anything with it), and other events in the
|
|
transaction will be processed as normal).
|
|
|
|
It is likely that we'll then receive other events which refer to
|
|
this rejected_event in their prev_events, etc. When that happens,
|
|
we'll attempt to fetch the rejected event again, which will presumably
|
|
fail, so those second-generation events will also get rejected.
|
|
|
|
Eventually, we get to the point where there are more than 10 events
|
|
between any new events and the original rejected event. Since we
|
|
only try to backfill 10 events deep on received pdu, we then accept the
|
|
new event, possibly introducing a discontinuity in the DAG, with new
|
|
forward extremities, so normal service is approximately returned,
|
|
until we try to backfill across the discontinuity.
|
|
|
|
Args:
|
|
origin (str): server which sent the pdu
|
|
pdu (FrozenEvent): received pdu
|
|
|
|
Returns (Deferred): completes with None
|
|
|
|
Raises: FederationError if the signatures / hash do not match, or
|
|
if the event was unacceptable for any other reason (eg, too large,
|
|
too many prev_events, couldn't find the prev_events)
|
|
"""
|
|
# check that it's actually being sent from a valid destination to
|
|
# workaround bug #1753 in 0.18.5 and 0.18.6
|
|
if origin != get_domain_from_id(pdu.event_id):
|
|
# We continue to accept join events from any server; this is
|
|
# necessary for the federation join dance to work correctly.
|
|
# (When we join over federation, the "helper" server is
|
|
# responsible for sending out the join event, rather than the
|
|
# origin. See bug #1893).
|
|
if not (
|
|
pdu.type == 'm.room.member' and
|
|
pdu.content and
|
|
pdu.content.get("membership", None) == 'join'
|
|
):
|
|
logger.info(
|
|
"Discarding PDU %s from invalid origin %s",
|
|
pdu.event_id, origin
|
|
)
|
|
return
|
|
else:
|
|
logger.info(
|
|
"Accepting join PDU %s from %s",
|
|
pdu.event_id, origin
|
|
)
|
|
|
|
# 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,
|
|
)
|
|
|
|
yield self.handler.on_receive_pdu(origin, pdu, get_missing=True)
|
|
|
|
def __str__(self):
|
|
return "<ReplicationLayer(%s)>" % self.server_name
|
|
|
|
@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)
|
|
|
|
|
|
class FederationHandlerRegistry(object):
|
|
"""Allows classes to register themselves as handlers for a given EDU or
|
|
query type for incoming federation traffic.
|
|
"""
|
|
def __init__(self):
|
|
self.edu_handlers = {}
|
|
self.query_handlers = {}
|
|
|
|
def register_edu_handler(self, edu_type, handler):
|
|
"""Sets the handler callable that will be used to handle an incoming
|
|
federation EDU of the given type.
|
|
|
|
Args:
|
|
edu_type (str): The type of the incoming EDU to register handler for
|
|
handler (Callable[[str, dict]]): A callable invoked on incoming EDU
|
|
of the given type. The arguments are the origin server name and
|
|
the EDU contents.
|
|
"""
|
|
if edu_type in self.edu_handlers:
|
|
raise KeyError("Already have an EDU handler for %s" % (edu_type,))
|
|
|
|
self.edu_handlers[edu_type] = handler
|
|
|
|
def register_query_handler(self, query_type, handler):
|
|
"""Sets the handler callable that will be used to handle an incoming
|
|
federation query of the given type.
|
|
|
|
Args:
|
|
query_type (str): Category name of the query, which should match
|
|
the string used by make_query.
|
|
handler (Callable[[dict], Deferred[dict]]): Invoked to handle
|
|
incoming queries of this type. The return will be yielded
|
|
on and the result used as the response to the query request.
|
|
"""
|
|
if query_type in self.query_handlers:
|
|
raise KeyError(
|
|
"Already have a Query handler for %s" % (query_type,)
|
|
)
|
|
|
|
self.query_handlers[query_type] = handler
|
|
|
|
@defer.inlineCallbacks
|
|
def on_edu(self, edu_type, origin, content):
|
|
handler = self.edu_handlers.get(edu_type)
|
|
if not handler:
|
|
logger.warn("No handler registered for EDU type %s", edu_type)
|
|
|
|
try:
|
|
yield handler(origin, content)
|
|
except SynapseError as e:
|
|
logger.info("Failed to handle edu %r: %r", edu_type, e)
|
|
except Exception as e:
|
|
logger.exception("Failed to handle edu %r", edu_type)
|
|
|
|
def on_query(self, query_type, args):
|
|
handler = self.query_handlers.get(query_type)
|
|
if not handler:
|
|
logger.warn("No handler registered for query type %s", query_type)
|
|
raise NotFoundError("No handler for Query type '%s'" % (query_type,))
|
|
|
|
return handler(args)
|