mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-28 21:06:10 -05:00
134 lines
4.1 KiB
Python
134 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2015 OpenMarket Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
|
|
from twisted.internet import defer
|
|
|
|
from synapse.events.utils import prune_event
|
|
|
|
from syutil.jsonutil import encode_canonical_json
|
|
|
|
from synapse.crypto.event_signing import check_event_content_hash
|
|
|
|
from synapse.api.errors import SynapseError
|
|
|
|
import logging
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class FederationBase(object):
|
|
@defer.inlineCallbacks
|
|
def _check_sigs_and_hash_and_fetch(self, origin, pdus, outlier=False):
|
|
"""Takes a list of PDUs and checks the signatures and hashs of each
|
|
one. If a PDU fails its signature check then we check if we have it in
|
|
the database and if not then request if from the originating server of
|
|
that PDU.
|
|
|
|
If a PDU fails its content hash check then it is redacted.
|
|
|
|
The given list of PDUs are not modified, instead the function returns
|
|
a new list.
|
|
|
|
Args:
|
|
pdu (list)
|
|
outlier (bool)
|
|
|
|
Returns:
|
|
Deferred : A list of PDUs that have valid signatures and hashes.
|
|
"""
|
|
|
|
signed_pdus = []
|
|
|
|
@defer.inlineCallbacks
|
|
def do(pdu):
|
|
try:
|
|
new_pdu = yield self._check_sigs_and_hash(pdu)
|
|
signed_pdus.append(new_pdu)
|
|
except SynapseError:
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
# Check local db.
|
|
new_pdu = yield self.store.get_event(
|
|
pdu.event_id,
|
|
allow_rejected=True,
|
|
allow_none=True,
|
|
)
|
|
if new_pdu:
|
|
signed_pdus.append(new_pdu)
|
|
return
|
|
|
|
# Check pdu.origin
|
|
if pdu.origin != origin:
|
|
try:
|
|
new_pdu = yield self.get_pdu(
|
|
destinations=[pdu.origin],
|
|
event_id=pdu.event_id,
|
|
outlier=outlier,
|
|
)
|
|
|
|
if new_pdu:
|
|
signed_pdus.append(new_pdu)
|
|
return
|
|
except:
|
|
pass
|
|
|
|
logger.warn(
|
|
"Failed to find copy of %s with valid signature",
|
|
pdu.event_id,
|
|
)
|
|
|
|
yield defer.gatherResults(
|
|
[do(pdu) for pdu in pdus],
|
|
consumeErrors=True
|
|
)
|
|
|
|
defer.returnValue(signed_pdus)
|
|
|
|
@defer.inlineCallbacks
|
|
def _check_sigs_and_hash(self, pdu):
|
|
"""Throws a SynapseError if the PDU does not have the correct
|
|
signatures.
|
|
|
|
Returns:
|
|
FrozenEvent: Either the given event or it redacted if it failed the
|
|
content hash check.
|
|
"""
|
|
# Check signatures are correct.
|
|
redacted_event = prune_event(pdu)
|
|
redacted_pdu_json = redacted_event.get_pdu_json()
|
|
|
|
try:
|
|
yield self.keyring.verify_json_for_server(
|
|
pdu.origin, redacted_pdu_json
|
|
)
|
|
except SynapseError:
|
|
logger.warn(
|
|
"Signature check failed for %s redacted to %s",
|
|
encode_canonical_json(pdu.get_pdu_json()),
|
|
encode_canonical_json(redacted_pdu_json),
|
|
)
|
|
raise
|
|
|
|
if not check_event_content_hash(pdu):
|
|
logger.warn(
|
|
"Event content has been tampered, redacting %s, %s",
|
|
pdu.event_id, encode_canonical_json(pdu.get_dict())
|
|
)
|
|
defer.returnValue(redacted_event)
|
|
|
|
defer.returnValue(pdu)
|