mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-12-12 08:54:21 -05:00
410 lines
12 KiB
Python
410 lines
12 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 .units import Edu
|
|
|
|
from synapse.util.logutils import log_function
|
|
from synapse.events import FrozenEvent
|
|
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 FederationClient(object):
|
|
@log_function
|
|
def send_pdu(self, pdu, destinations):
|
|
"""Informs the replication layer about a new PDU generated within the
|
|
home server that should be transmitted to others.
|
|
|
|
TODO: Figure out when we should actually resolve the deferred.
|
|
|
|
Args:
|
|
pdu (Pdu): The new Pdu.
|
|
|
|
Returns:
|
|
Deferred: Completes when we have successfully processed the PDU
|
|
and replicated it to any interested remote home servers.
|
|
"""
|
|
order = self._order
|
|
self._order += 1
|
|
|
|
logger.debug("[%s] transaction_layer.enqueue_pdu... ", pdu.event_id)
|
|
|
|
# TODO, add errback, etc.
|
|
self._transaction_queue.enqueue_pdu(pdu, destinations, order)
|
|
|
|
logger.debug(
|
|
"[%s] transaction_layer.enqueue_pdu... done",
|
|
pdu.event_id
|
|
)
|
|
|
|
@log_function
|
|
def send_edu(self, destination, edu_type, content):
|
|
edu = Edu(
|
|
origin=self.server_name,
|
|
destination=destination,
|
|
edu_type=edu_type,
|
|
content=content,
|
|
)
|
|
|
|
# TODO, add errback, etc.
|
|
self._transaction_queue.enqueue_edu(edu)
|
|
return defer.succeed(None)
|
|
|
|
@log_function
|
|
def send_failure(self, failure, destination):
|
|
self._transaction_queue.enqueue_failure(failure, destination)
|
|
return defer.succeed(None)
|
|
|
|
@log_function
|
|
def make_query(self, destination, query_type, args,
|
|
retry_on_dns_fail=True):
|
|
"""Sends a federation Query to a remote homeserver of the given type
|
|
and arguments.
|
|
|
|
Args:
|
|
destination (str): Domain name of the remote homeserver
|
|
query_type (str): Category of the query type; should match the
|
|
handler name used in register_query_handler().
|
|
args (dict): Mapping of strings to strings containing the details
|
|
of the query request.
|
|
|
|
Returns:
|
|
a Deferred which will eventually yield a JSON object from the
|
|
response
|
|
"""
|
|
return self.transport_layer.make_query(
|
|
destination, query_type, args, retry_on_dns_fail=retry_on_dns_fail
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def backfill(self, dest, context, limit, extremities):
|
|
"""Requests some more historic PDUs for the given context from the
|
|
given destination server.
|
|
|
|
Args:
|
|
dest (str): The remote home server to ask.
|
|
context (str): The context to backfill.
|
|
limit (int): The maximum number of PDUs to return.
|
|
extremities (list): List of PDU id and origins of the first pdus
|
|
we have seen from the context
|
|
|
|
Returns:
|
|
Deferred: Results in the received PDUs.
|
|
"""
|
|
logger.debug("backfill extrem=%s", extremities)
|
|
|
|
# If there are no extremeties then we've (probably) reached the start.
|
|
if not extremities:
|
|
return
|
|
|
|
transaction_data = yield self.transport_layer.backfill(
|
|
dest, context, extremities, limit)
|
|
|
|
logger.debug("backfill transaction_data=%s", repr(transaction_data))
|
|
|
|
pdus = [
|
|
self.event_from_pdu_json(p, outlier=False)
|
|
for p in transaction_data["pdus"]
|
|
]
|
|
|
|
for i, pdu in enumerate(pdus):
|
|
pdus[i] = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
defer.returnValue(pdus)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def get_pdu(self, destinations, event_id, outlier=False):
|
|
"""Requests the PDU with given origin and ID from the remote home
|
|
servers.
|
|
|
|
Will attempt to get the PDU from each destination in the list until
|
|
one succeeds.
|
|
|
|
This will persist the PDU locally upon receipt.
|
|
|
|
Args:
|
|
destinations (list): Which home servers to query
|
|
pdu_origin (str): The home server that originally sent the pdu.
|
|
event_id (str)
|
|
outlier (bool): Indicates whether the PDU is an `outlier`, i.e. if
|
|
it's from an arbitary point in the context as opposed to part
|
|
of the current block of PDUs. Defaults to `False`
|
|
|
|
Returns:
|
|
Deferred: Results in the requested PDU.
|
|
"""
|
|
|
|
# TODO: Rate limit the number of times we try and get the same event.
|
|
|
|
pdu = None
|
|
for destination in destinations:
|
|
try:
|
|
transaction_data = yield self.transport_layer.get_event(
|
|
destination, event_id
|
|
)
|
|
|
|
logger.debug("transaction_data %r", transaction_data)
|
|
|
|
pdu_list = [
|
|
self.event_from_pdu_json(p, outlier=outlier)
|
|
for p in transaction_data["pdus"]
|
|
]
|
|
|
|
if pdu_list:
|
|
pdu = pdu_list[0]
|
|
|
|
# Check signatures are correct.
|
|
pdu = yield self._check_sigs_and_hash(pdu)
|
|
|
|
break
|
|
|
|
except Exception as e:
|
|
logger.info(
|
|
"Failed to get PDU %s from %s because %s",
|
|
event_id, destination, e,
|
|
)
|
|
continue
|
|
|
|
defer.returnValue(pdu)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def get_state_for_room(self, destination, room_id, event_id):
|
|
"""Requests all of the `current` state PDUs for a given room from
|
|
a remote home server.
|
|
|
|
Args:
|
|
destination (str): The remote homeserver to query for the state.
|
|
room_id (str): The id of the room we're interested in.
|
|
event_id (str): The id of the event we want the state at.
|
|
|
|
Returns:
|
|
Deferred: Results in a list of PDUs.
|
|
"""
|
|
|
|
result = yield self.transport_layer.get_room_state(
|
|
destination, room_id, event_id=event_id,
|
|
)
|
|
|
|
pdus = [
|
|
self.event_from_pdu_json(p, outlier=True) for p in result["pdus"]
|
|
]
|
|
|
|
auth_chain = [
|
|
self.event_from_pdu_json(p, outlier=True)
|
|
for p in result.get("auth_chain", [])
|
|
]
|
|
|
|
for i, pdu in enumerate(pdus):
|
|
pdus[i] = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
for i, pdu in enumerate(auth_chain):
|
|
auth_chain[i] = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
defer.returnValue((pdus, auth_chain))
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def get_event_auth(self, destination, room_id, event_id):
|
|
res = yield self.transport_layer.get_event_auth(
|
|
destination, room_id, event_id,
|
|
)
|
|
|
|
auth_chain = [
|
|
self.event_from_pdu_json(p, outlier=True)
|
|
for p in res["auth_chain"]
|
|
]
|
|
|
|
for i, pdu in enumerate(auth_chain):
|
|
auth_chain[i] = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
auth_chain.sort(key=lambda e: e.depth)
|
|
|
|
defer.returnValue(auth_chain)
|
|
|
|
@defer.inlineCallbacks
|
|
def make_join(self, destination, room_id, user_id):
|
|
ret = yield self.transport_layer.make_join(
|
|
destination, room_id, user_id
|
|
)
|
|
|
|
pdu_dict = ret["event"]
|
|
|
|
logger.debug("Got response to make_join: %s", pdu_dict)
|
|
|
|
defer.returnValue(self.event_from_pdu_json(pdu_dict))
|
|
|
|
@defer.inlineCallbacks
|
|
def send_join(self, destination, pdu):
|
|
time_now = self._clock.time_msec()
|
|
_, content = yield self.transport_layer.send_join(
|
|
destination=destination,
|
|
room_id=pdu.room_id,
|
|
event_id=pdu.event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
logger.debug("Got content: %s", content)
|
|
|
|
state = [
|
|
self.event_from_pdu_json(p, outlier=True)
|
|
for p in content.get("state", [])
|
|
]
|
|
|
|
auth_chain = [
|
|
self.event_from_pdu_json(p, outlier=True)
|
|
for p in content.get("auth_chain", [])
|
|
]
|
|
|
|
for i, pdu in enumerate(state):
|
|
state[i] = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
for i, pdu in enumerate(auth_chain):
|
|
auth_chain[i] = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
auth_chain.sort(key=lambda e: e.depth)
|
|
|
|
defer.returnValue({
|
|
"state": state,
|
|
"auth_chain": auth_chain,
|
|
})
|
|
|
|
@defer.inlineCallbacks
|
|
def send_invite(self, destination, room_id, event_id, pdu):
|
|
time_now = self._clock.time_msec()
|
|
code, content = yield self.transport_layer.send_invite(
|
|
destination=destination,
|
|
room_id=room_id,
|
|
event_id=event_id,
|
|
content=pdu.get_pdu_json(time_now),
|
|
)
|
|
|
|
pdu_dict = content["event"]
|
|
|
|
logger.debug("Got response to send_invite: %s", pdu_dict)
|
|
|
|
pdu = self.event_from_pdu_json(pdu_dict)
|
|
|
|
# Check signatures are correct.
|
|
pdu = yield self._check_sigs_and_hash(pdu)
|
|
|
|
# FIXME: We should handle signature failures more gracefully.
|
|
|
|
defer.returnValue(pdu)
|
|
|
|
@defer.inlineCallbacks
|
|
def query_auth(self, destination, room_id, event_id, local_auth):
|
|
"""
|
|
Params:
|
|
destination (str)
|
|
event_it (str)
|
|
local_auth (list)
|
|
"""
|
|
time_now = self._clock.time_msec()
|
|
|
|
send_content = {
|
|
"auth_chain": [e.get_pdu_json(time_now) for e in local_auth],
|
|
}
|
|
|
|
code, content = yield self.transport_layer.send_query_auth(
|
|
destination=destination,
|
|
room_id=room_id,
|
|
event_id=event_id,
|
|
content=send_content,
|
|
)
|
|
|
|
auth_chain = [
|
|
(yield self._check_sigs_and_hash(self.event_from_pdu_json(e)))
|
|
for e in content["auth_chain"]
|
|
]
|
|
|
|
ret = {
|
|
"auth_chain": auth_chain,
|
|
"rejects": content.get("rejects", []),
|
|
"missing": content.get("missing", []),
|
|
}
|
|
|
|
defer.returnValue(ret)
|
|
|
|
def event_from_pdu_json(self, pdu_json, outlier=False):
|
|
event = FrozenEvent(
|
|
pdu_json
|
|
)
|
|
|
|
event.internal_metadata.outlier = outlier
|
|
|
|
return event
|
|
|
|
@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)
|