synapse-product/synapse/handlers/federation.py

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# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
# 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.
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"""Contains handlers for federation events."""
from signedjson.key import decode_verify_key_bytes
from signedjson.sign import verify_signed_json
from unpaddedbase64 import decode_base64
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from ._base import BaseHandler
from synapse.api.errors import (
AuthError, FederationError, StoreError, CodeMessageException, SynapseError,
)
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from synapse.api.constants import EventTypes, Membership, RejectedReason
from synapse.events.validator import EventValidator
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from synapse.util import unwrapFirstError
from synapse.util.logcontext import PreserveLoggingContext, preserve_fn
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from synapse.util.logutils import log_function
from synapse.util.async import run_on_reactor
from synapse.util.frozenutils import unfreeze
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from synapse.crypto.event_signing import (
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compute_event_signature, add_hashes_and_signatures,
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)
from synapse.types import UserID, get_domain_from_id
from synapse.events.utils import prune_event
from synapse.util.retryutils import NotRetryingDestination
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from synapse.push.action_generator import ActionGenerator
from synapse.util.distributor import user_joined_room
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from twisted.internet import defer
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import itertools
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import logging
logger = logging.getLogger(__name__)
class FederationHandler(BaseHandler):
"""Handles events that originated from federation.
Responsible for:
a) handling received Pdus before handing them on as Events to the rest
of the home server (including auth and state conflict resoultion)
b) converting events that were produced by local clients that may need
to be sent to remote home servers.
c) doing the necessary dances to invite remote users and join remote
rooms.
"""
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def __init__(self, hs):
super(FederationHandler, self).__init__(hs)
self.hs = hs
self.store = hs.get_datastore()
self.replication_layer = hs.get_replication_layer()
self.state_handler = hs.get_state_handler()
self.server_name = hs.hostname
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self.keyring = hs.get_keyring()
self.replication_layer.set_handler(self)
# When joining a room we need to queue any events for that room up
self.room_queues = {}
def handle_new_event(self, event, destinations):
""" Takes in an event from the client to server side, that has already
been authed and handled by the state module, and sends it to any
remote home servers that may be interested.
Args:
event: The event to send
destinations: A list of destinations to send it to
Returns:
Deferred: Resolved when it has successfully been queued for
processing.
"""
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return self.replication_layer.send_pdu(event, destinations)
@log_function
@defer.inlineCallbacks
def on_receive_pdu(self, origin, pdu, state=None, auth_chain=None):
""" Called by the ReplicationLayer when we have a new pdu. We need to
do auth checks and put it through the StateHandler.
"""
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event = pdu
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logger.debug("Got event: %s", event.event_id)
# If we are currently in the process of joining this room, then we
# queue up events for later processing.
if event.room_id in self.room_queues:
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self.room_queues[event.room_id].append((pdu, origin))
return
logger.debug("Processing event: %s", event.event_id)
logger.debug("Event: %s", event)
# FIXME (erikj): Awful hack to make the case where we are not currently
# in the room work
is_in_room = yield self.auth.check_host_in_room(
event.room_id,
self.server_name
)
if not is_in_room and not event.internal_metadata.is_outlier():
logger.debug("Got event for room we're not in.")
try:
event_stream_id, max_stream_id = yield self._persist_auth_tree(
auth_chain, state, event
)
except AuthError as e:
raise FederationError(
"ERROR",
e.code,
e.msg,
affected=event.event_id,
)
else:
event_ids = set()
if state:
event_ids |= {e.event_id for e in state}
if auth_chain:
event_ids |= {e.event_id for e in auth_chain}
seen_ids = set(
(yield self.store.have_events(event_ids)).keys()
)
if state and auth_chain is not None:
# If we have any state or auth_chain given to us by the replication
# layer, then we should handle them (if we haven't before.)
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event_infos = []
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for e in itertools.chain(auth_chain, state):
if e.event_id in seen_ids:
continue
e.internal_metadata.outlier = True
auth_ids = [e_id for e_id, _ in e.auth_events]
auth = {
(e.type, e.state_key): e for e in auth_chain
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if e.event_id in auth_ids or e.type == EventTypes.Create
}
event_infos.append({
"event": e,
"auth_events": auth,
})
seen_ids.add(e.event_id)
yield self._handle_new_events(origin, event_infos)
try:
context, event_stream_id, max_stream_id = yield self._handle_new_event(
origin,
event,
state=state,
)
except AuthError as e:
raise FederationError(
"ERROR",
e.code,
e.msg,
affected=event.event_id,
)
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# if we're receiving valid events from an origin,
# it's probably a good idea to mark it as not in retry-state
# for sending (although this is a bit of a leap)
retry_timings = yield self.store.get_destination_retry_timings(origin)
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if retry_timings and retry_timings["retry_last_ts"]:
self.store.set_destination_retry_timings(origin, 0, 0)
room = yield self.store.get_room(event.room_id)
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if not room:
try:
yield self.store.store_room(
room_id=event.room_id,
room_creator_user_id="",
is_public=False,
)
except StoreError:
logger.exception("Failed to store room.")
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extra_users = []
if event.type == EventTypes.Member:
target_user_id = event.state_key
target_user = UserID.from_string(target_user_id)
extra_users.append(target_user)
with PreserveLoggingContext():
self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id,
extra_users=extra_users
)
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if event.type == EventTypes.Member:
if event.membership == Membership.JOIN:
prev_state = context.current_state.get((event.type, event.state_key))
if not prev_state or prev_state.membership != Membership.JOIN:
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# Only fire user_joined_room if the user has acutally
# joined the room. Don't bother if the user is just
# changing their profile info.
user = UserID.from_string(event.state_key)
yield user_joined_room(self.distributor, user, event.room_id)
@defer.inlineCallbacks
def _filter_events_for_server(self, server_name, room_id, events):
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event_to_state = yield self.store.get_state_for_events(
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frozenset(e.event_id for e in events),
types=(
(EventTypes.RoomHistoryVisibility, ""),
(EventTypes.Member, None),
)
)
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def redact_disallowed(event, state):
if not state:
return event
history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
if history:
visibility = history.content.get("history_visibility", "shared")
if visibility in ["invited", "joined"]:
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# We now loop through all state events looking for
# membership states for the requesting server to determine
# if the server is either in the room or has been invited
# into the room.
for ev in state.values():
if ev.type != EventTypes.Member:
continue
try:
domain = UserID.from_string(ev.state_key).domain
except:
continue
if domain != server_name:
continue
memtype = ev.membership
if memtype == Membership.JOIN:
return event
elif memtype == Membership.INVITE:
if visibility == "invited":
return event
else:
return prune_event(event)
return event
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defer.returnValue([
redact_disallowed(e, event_to_state[e.event_id])
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for e in events
])
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@log_function
@defer.inlineCallbacks
def backfill(self, dest, room_id, limit, extremities=[]):
""" Trigger a backfill request to `dest` for the given `room_id`
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This will attempt to get more events from the remote. This may return
be successfull and still return no events if the other side has no new
events to offer.
"""
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if dest == self.server_name:
raise SynapseError(400, "Can't backfill from self.")
if not extremities:
extremities = yield self.store.get_oldest_events_in_room(room_id)
events = yield self.replication_layer.backfill(
dest,
room_id,
limit=limit,
extremities=extremities,
)
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# Don't bother processing events we already have.
seen_events = yield self.store.have_events_in_timeline(
set(e.event_id for e in events)
)
events = [e for e in events if e.event_id not in seen_events]
if not events:
defer.returnValue([])
event_map = {e.event_id: e for e in events}
event_ids = set(e.event_id for e in events)
edges = [
ev.event_id
for ev in events
if set(e_id for e_id, _ in ev.prev_events) - event_ids
]
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logger.info(
"backfill: Got %d events with %d edges",
len(events), len(edges),
)
# For each edge get the current state.
auth_events = {}
state_events = {}
events_to_state = {}
for e_id in edges:
state, auth = yield self.replication_layer.get_state_for_room(
destination=dest,
room_id=room_id,
event_id=e_id
)
auth_events.update({a.event_id: a for a in auth})
auth_events.update({s.event_id: s for s in state})
state_events.update({s.event_id: s for s in state})
events_to_state[e_id] = state
seen_events = yield self.store.have_events(
set(auth_events.keys()) | set(state_events.keys())
)
all_events = events + state_events.values() + auth_events.values()
required_auth = set(
a_id for event in all_events for a_id, _ in event.auth_events
)
missing_auth = required_auth - set(auth_events)
results = yield defer.gatherResults(
[
self.replication_layer.get_pdu(
[dest],
event_id,
outlier=True,
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timeout=10000,
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)
for event_id in missing_auth
],
consumeErrors=True
).addErrback(unwrapFirstError)
auth_events.update({a.event_id: a for a in results})
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ev_infos = []
for a in auth_events.values():
if a.event_id in seen_events:
continue
a.internal_metadata.outlier = True
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ev_infos.append({
"event": a,
"auth_events": {
(auth_events[a_id].type, auth_events[a_id].state_key):
auth_events[a_id]
for a_id, _ in a.auth_events
}
})
for e_id in events_to_state:
ev_infos.append({
"event": event_map[e_id],
"state": events_to_state[e_id],
"auth_events": {
(auth_events[a_id].type, auth_events[a_id].state_key):
auth_events[a_id]
for a_id, _ in event_map[e_id].auth_events
}
})
yield self._handle_new_events(
dest, ev_infos,
backfilled=True,
)
events.sort(key=lambda e: e.depth)
for event in events:
if event in events_to_state:
continue
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# We store these one at a time since each event depends on the
# previous to work out the state.
# TODO: We can probably do something more clever here.
yield self._handle_new_event(
dest, event
)
defer.returnValue(events)
@defer.inlineCallbacks
def maybe_backfill(self, room_id, current_depth):
"""Checks the database to see if we should backfill before paginating,
and if so do.
"""
extremities = yield self.store.get_oldest_events_with_depth_in_room(
room_id
)
if not extremities:
logger.debug("Not backfilling as no extremeties found.")
return
# Check if we reached a point where we should start backfilling.
sorted_extremeties_tuple = sorted(
extremities.items(),
key=lambda e: -int(e[1])
)
max_depth = sorted_extremeties_tuple[0][1]
if current_depth > max_depth:
logger.debug(
"Not backfilling as we don't need to. %d < %d",
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max_depth, current_depth,
)
return
# Now we need to decide which hosts to hit first.
# First we try hosts that are already in the room
# TODO: HEURISTIC ALERT.
curr_state = yield self.state_handler.get_current_state(room_id)
def get_domains_from_state(state):
joined_users = [
(state_key, int(event.depth))
for (e_type, state_key), event in state.items()
if e_type == EventTypes.Member
and event.membership == Membership.JOIN
]
joined_domains = {}
for u, d in joined_users:
try:
dom = get_domain_from_id(u)
old_d = joined_domains.get(dom)
if old_d:
joined_domains[dom] = min(d, old_d)
else:
joined_domains[dom] = d
except:
pass
return sorted(joined_domains.items(), key=lambda d: d[1])
curr_domains = get_domains_from_state(curr_state)
likely_domains = [
domain for domain, depth in curr_domains
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if domain != self.server_name
]
@defer.inlineCallbacks
def try_backfill(domains):
# TODO: Should we try multiple of these at a time?
for dom in domains:
try:
yield self.backfill(
dom, room_id,
limit=100,
extremities=[e for e in extremities.keys()]
)
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# If this succeeded then we probably already have the
# appropriate stuff.
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# TODO: We can probably do something more intelligent here.
defer.returnValue(True)
except SynapseError as e:
logger.info(
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"Failed to backfill from %s because %s",
dom, e,
)
continue
except CodeMessageException as e:
if 400 <= e.code < 500:
raise
logger.info(
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"Failed to backfill from %s because %s",
dom, e,
)
continue
except NotRetryingDestination as e:
logger.info(e.message)
continue
except Exception as e:
logger.exception(
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"Failed to backfill from %s because %s",
dom, e,
)
continue
defer.returnValue(False)
success = yield try_backfill(likely_domains)
if success:
defer.returnValue(True)
# Huh, well *those* domains didn't work out. Lets try some domains
# from the time.
tried_domains = set(likely_domains)
tried_domains.add(self.server_name)
event_ids = list(extremities.keys())
states = yield defer.gatherResults([
self.state_handler.resolve_state_groups(room_id, [e])
for e in event_ids
])
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states = dict(zip(event_ids, [s[1] for s in states]))
for e_id, _ in sorted_extremeties_tuple:
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likely_domains = get_domains_from_state(states[e_id])
success = yield try_backfill([
dom for dom in likely_domains
if dom not in tried_domains
])
if success:
defer.returnValue(True)
tried_domains.update(likely_domains)
defer.returnValue(False)
@defer.inlineCallbacks
def send_invite(self, target_host, event):
""" Sends the invite to the remote server for signing.
Invites must be signed by the invitee's server before distribution.
"""
pdu = yield self.replication_layer.send_invite(
destination=target_host,
room_id=event.room_id,
event_id=event.event_id,
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pdu=event
)
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defer.returnValue(pdu)
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@defer.inlineCallbacks
def on_event_auth(self, event_id):
auth = yield self.store.get_auth_chain([event_id])
for event in auth:
event.signatures.update(
compute_event_signature(
event,
self.hs.hostname,
self.hs.config.signing_key[0]
)
)
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defer.returnValue([e for e in auth])
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@log_function
@defer.inlineCallbacks
def do_invite_join(self, target_hosts, room_id, joinee, content):
""" Attempts to join the `joinee` to the room `room_id` via the
server `target_host`.
This first triggers a /make_join/ request that returns a partial
event that we can fill out and sign. This is then sent to the
remote server via /send_join/ which responds with the state at that
event and the auth_chains.
We suspend processing of any received events from this room until we
have finished processing the join.
"""
logger.debug("Joining %s to %s", joinee, room_id)
yield self.store.clean_room_for_join(room_id)
origin, event = yield self._make_and_verify_event(
target_hosts,
room_id,
joinee,
"join",
content,
)
self.room_queues[room_id] = []
handled_events = set()
try:
event = self._sign_event(event)
# Try the host we successfully got a response to /make_join/
# request first.
try:
target_hosts.remove(origin)
target_hosts.insert(0, origin)
except ValueError:
pass
ret = yield self.replication_layer.send_join(target_hosts, event)
origin = ret["origin"]
state = ret["state"]
auth_chain = ret["auth_chain"]
auth_chain.sort(key=lambda e: e.depth)
handled_events.update([s.event_id for s in state])
handled_events.update([a.event_id for a in auth_chain])
handled_events.add(event.event_id)
logger.debug("do_invite_join auth_chain: %s", auth_chain)
logger.debug("do_invite_join state: %s", state)
logger.debug("do_invite_join event: %s", event)
try:
yield self.store.store_room(
room_id=room_id,
room_creator_user_id="",
is_public=False
)
except:
# FIXME
pass
event_stream_id, max_stream_id = yield self._persist_auth_tree(
auth_chain, state, event
)
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with PreserveLoggingContext():
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self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id,
extra_users=[joinee]
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)
logger.debug("Finished joining %s to %s", joinee, room_id)
finally:
room_queue = self.room_queues[room_id]
del self.room_queues[room_id]
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for p, origin in room_queue:
if p.event_id in handled_events:
continue
try:
self.on_receive_pdu(origin, p)
except:
logger.exception("Couldn't handle pdu")
defer.returnValue(True)
@defer.inlineCallbacks
@log_function
def on_make_join_request(self, room_id, user_id):
""" We've received a /make_join/ request, so we create a partial
join event for the room and return that. We do *not* persist or
process it until the other server has signed it and sent it back.
"""
event_content = {"membership": Membership.JOIN}
builder = self.event_builder_factory.new({
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"type": EventTypes.Member,
"content": event_content,
"room_id": room_id,
"sender": user_id,
"state_key": user_id,
})
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try:
message_handler = self.hs.get_handlers().message_handler
event, context = yield message_handler._create_new_client_event(
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builder=builder,
)
except AuthError as e:
logger.warn("Failed to create join %r because %s", event, e)
raise e
self.auth.check(event, auth_events=context.current_state)
defer.returnValue(event)
@defer.inlineCallbacks
@log_function
def on_send_join_request(self, origin, pdu):
""" We have received a join event for a room. Fully process it and
respond with the current state and auth chains.
"""
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event = pdu
logger.debug(
"on_send_join_request: Got event: %s, signatures: %s",
event.event_id,
event.signatures,
)
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event.internal_metadata.outlier = False
context, event_stream_id, max_stream_id = yield self._handle_new_event(
origin, event
)
logger.debug(
"on_send_join_request: After _handle_new_event: %s, sigs: %s",
event.event_id,
event.signatures,
)
extra_users = []
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if event.type == EventTypes.Member:
target_user_id = event.state_key
target_user = UserID.from_string(target_user_id)
extra_users.append(target_user)
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with PreserveLoggingContext():
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self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id, extra_users=extra_users
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)
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if event.type == EventTypes.Member:
if event.content["membership"] == Membership.JOIN:
user = UserID.from_string(event.state_key)
yield user_joined_room(self.distributor, user, event.room_id)
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new_pdu = event
destinations = set()
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for k, s in context.current_state.items():
try:
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if k[0] == EventTypes.Member:
if s.content["membership"] == Membership.JOIN:
destinations.add(get_domain_from_id(s.state_key))
except:
logger.warn(
"Failed to get destination from event %s", s.event_id
)
destinations.discard(origin)
logger.debug(
"on_send_join_request: Sending event: %s, signatures: %s",
event.event_id,
event.signatures,
)
self.replication_layer.send_pdu(new_pdu, destinations)
state_ids = [e.event_id for e in context.current_state.values()]
auth_chain = yield self.store.get_auth_chain(set(
[event.event_id] + state_ids
))
defer.returnValue({
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"state": context.current_state.values(),
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"auth_chain": auth_chain,
})
@defer.inlineCallbacks
def on_invite_request(self, origin, pdu):
""" We've got an invite event. Process and persist it. Sign it.
Respond with the now signed event.
"""
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event = pdu
event.internal_metadata.outlier = True
event.internal_metadata.invite_from_remote = True
event.signatures.update(
compute_event_signature(
event,
self.hs.hostname,
self.hs.config.signing_key[0]
)
)
context = yield self.state_handler.compute_event_context(event)
event_stream_id, max_stream_id = yield self.store.persist_event(
event,
context=context,
)
target_user = UserID.from_string(event.state_key)
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with PreserveLoggingContext():
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self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id,
extra_users=[target_user],
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)
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defer.returnValue(event)
@defer.inlineCallbacks
def do_remotely_reject_invite(self, target_hosts, room_id, user_id):
try:
origin, event = yield self._make_and_verify_event(
target_hosts,
room_id,
user_id,
"leave"
)
signed_event = self._sign_event(event)
except SynapseError:
raise
except CodeMessageException as e:
logger.warn("Failed to reject invite: %s", e)
raise SynapseError(500, "Failed to reject invite")
# Try the host we successfully got a response to /make_join/
# request first.
try:
target_hosts.remove(origin)
target_hosts.insert(0, origin)
except ValueError:
pass
try:
yield self.replication_layer.send_leave(
target_hosts,
signed_event
)
except SynapseError:
raise
except CodeMessageException as e:
logger.warn("Failed to reject invite: %s", e)
raise SynapseError(500, "Failed to reject invite")
context = yield self.state_handler.compute_event_context(event)
event_stream_id, max_stream_id = yield self.store.persist_event(
event,
context=context,
)
target_user = UserID.from_string(event.state_key)
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self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id,
extra_users=[target_user],
)
defer.returnValue(event)
@defer.inlineCallbacks
def _make_and_verify_event(self, target_hosts, room_id, user_id, membership,
content={},):
origin, pdu = yield self.replication_layer.make_membership_event(
target_hosts,
room_id,
user_id,
membership,
content,
)
logger.debug("Got response to make_%s: %s", membership, pdu)
event = pdu
# We should assert some things.
# FIXME: Do this in a nicer way
assert(event.type == EventTypes.Member)
assert(event.user_id == user_id)
assert(event.state_key == user_id)
assert(event.room_id == room_id)
defer.returnValue((origin, event))
def _sign_event(self, event):
event.internal_metadata.outlier = False
builder = self.event_builder_factory.new(
unfreeze(event.get_pdu_json())
)
builder.event_id = self.event_builder_factory.create_event_id()
builder.origin = self.hs.hostname
if not hasattr(event, "signatures"):
builder.signatures = {}
add_hashes_and_signatures(
builder,
self.hs.hostname,
self.hs.config.signing_key[0],
)
return builder.build()
@defer.inlineCallbacks
@log_function
def on_make_leave_request(self, room_id, user_id):
""" We've received a /make_leave/ request, so we create a partial
join event for the room and return that. We do *not* persist or
process it until the other server has signed it and sent it back.
"""
builder = self.event_builder_factory.new({
"type": EventTypes.Member,
"content": {"membership": Membership.LEAVE},
"room_id": room_id,
"sender": user_id,
"state_key": user_id,
})
message_handler = self.hs.get_handlers().message_handler
event, context = yield message_handler._create_new_client_event(
builder=builder,
)
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try:
self.auth.check(event, auth_events=context.current_state)
except AuthError as e:
logger.warn("Failed to create new leave %r because %s", event, e)
raise e
defer.returnValue(event)
@defer.inlineCallbacks
@log_function
def on_send_leave_request(self, origin, pdu):
""" We have received a leave event for a room. Fully process it."""
event = pdu
logger.debug(
"on_send_leave_request: Got event: %s, signatures: %s",
event.event_id,
event.signatures,
)
event.internal_metadata.outlier = False
context, event_stream_id, max_stream_id = yield self._handle_new_event(
origin, event
)
logger.debug(
"on_send_leave_request: After _handle_new_event: %s, sigs: %s",
event.event_id,
event.signatures,
)
extra_users = []
if event.type == EventTypes.Member:
target_user_id = event.state_key
target_user = UserID.from_string(target_user_id)
extra_users.append(target_user)
with PreserveLoggingContext():
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self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id, extra_users=extra_users
)
new_pdu = event
destinations = set()
for k, s in context.current_state.items():
try:
if k[0] == EventTypes.Member:
if s.content["membership"] == Membership.LEAVE:
destinations.add(get_domain_from_id(s.state_key))
except:
logger.warn(
"Failed to get destination from event %s", s.event_id
)
destinations.discard(origin)
logger.debug(
"on_send_leave_request: Sending event: %s, signatures: %s",
event.event_id,
event.signatures,
)
self.replication_layer.send_pdu(new_pdu, destinations)
defer.returnValue(None)
@defer.inlineCallbacks
def get_state_for_pdu(self, origin, room_id, event_id, do_auth=True):
yield run_on_reactor()
if do_auth:
in_room = yield self.auth.check_host_in_room(room_id, origin)
if not in_room:
raise AuthError(403, "Host not in room.")
state_groups = yield self.store.get_state_groups(
room_id, [event_id]
)
if state_groups:
_, state = state_groups.items().pop()
results = {
(e.type, e.state_key): e for e in state
}
event = yield self.store.get_event(event_id)
if event and event.is_state():
# Get previous state
if "replaces_state" in event.unsigned:
prev_id = event.unsigned["replaces_state"]
if prev_id != event.event_id:
prev_event = yield self.store.get_event(prev_id)
results[(event.type, event.state_key)] = prev_event
else:
del results[(event.type, event.state_key)]
res = results.values()
for event in res:
event.signatures.update(
compute_event_signature(
event,
self.hs.hostname,
self.hs.config.signing_key[0]
)
)
defer.returnValue(res)
else:
defer.returnValue([])
@defer.inlineCallbacks
@log_function
def on_backfill_request(self, origin, room_id, pdu_list, limit):
in_room = yield self.auth.check_host_in_room(room_id, origin)
if not in_room:
raise AuthError(403, "Host not in room.")
events = yield self.store.get_backfill_events(
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room_id,
pdu_list,
limit
)
events = yield self._filter_events_for_server(origin, room_id, events)
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defer.returnValue(events)
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@defer.inlineCallbacks
@log_function
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.
Returns:
Deferred: Results in a `Pdu`.
"""
event = yield self.store.get_event(
event_id,
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allow_none=True,
allow_rejected=True,
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)
if event:
# FIXME: This is a temporary work around where we occasionally
# return events slightly differently than when they were
# originally signed
event.signatures.update(
compute_event_signature(
event,
self.hs.hostname,
self.hs.config.signing_key[0]
)
)
if do_auth:
in_room = yield self.auth.check_host_in_room(
event.room_id,
origin
)
if not in_room:
raise AuthError(403, "Host not in room.")
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defer.returnValue(event)
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else:
defer.returnValue(None)
@log_function
def get_min_depth_for_context(self, context):
return self.store.get_min_depth(context)
@defer.inlineCallbacks
@log_function
def _handle_new_event(self, origin, event, state=None, auth_events=None,
backfilled=False):
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context = yield self._prep_event(
origin, event,
state=state,
auth_events=auth_events,
)
if not event.internal_metadata.is_outlier():
action_generator = ActionGenerator(self.hs)
yield action_generator.handle_push_actions_for_event(
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event, context
)
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event_stream_id, max_stream_id = yield self.store.persist_event(
event,
context=context,
backfilled=backfilled,
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)
# this intentionally does not yield: we don't care about the result
# and don't need to wait for it.
preserve_fn(self.hs.get_pusherpool().on_new_notifications)(
event_stream_id, max_stream_id
)
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defer.returnValue((context, event_stream_id, max_stream_id))
@defer.inlineCallbacks
def _handle_new_events(self, origin, event_infos, backfilled=False):
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"""Creates the appropriate contexts and persists events. The events
should not depend on one another, e.g. this should be used to persist
a bunch of outliers, but not a chunk of individual events that depend
on each other for state calculations.
"""
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contexts = yield defer.gatherResults(
[
self._prep_event(
origin,
ev_info["event"],
state=ev_info.get("state"),
auth_events=ev_info.get("auth_events"),
)
for ev_info in event_infos
]
)
yield self.store.persist_events(
[
(ev_info["event"], context)
for ev_info, context in itertools.izip(event_infos, contexts)
],
backfilled=backfilled,
)
@defer.inlineCallbacks
def _persist_auth_tree(self, auth_events, state, event):
"""Checks the auth chain is valid (and passes auth checks) for the
state and event. Then persists the auth chain and state atomically.
Persists the event seperately.
Returns:
2-tuple of (event_stream_id, max_stream_id) from the persist_event
call for `event`
"""
events_to_context = {}
for e in itertools.chain(auth_events, state):
e.internal_metadata.outlier = True
ctx = yield self.state_handler.compute_event_context(e)
events_to_context[e.event_id] = ctx
event_map = {
e.event_id: e
for e in auth_events
}
create_event = None
for e in auth_events:
if (e.type, e.state_key) == (EventTypes.Create, ""):
create_event = e
break
for e in itertools.chain(auth_events, state, [event]):
auth_for_e = {
(event_map[e_id].type, event_map[e_id].state_key): event_map[e_id]
for e_id, _ in e.auth_events
}
if create_event:
auth_for_e[(EventTypes.Create, "")] = create_event
try:
self.auth.check(e, auth_events=auth_for_e)
except SynapseError as err:
# we may get SynapseErrors here as well as AuthErrors. For
# instance, there are a couple of (ancient) events in some
# rooms whose senders do not have the correct sigil; these
# cause SynapseErrors in auth.check. We don't want to give up
# the attempt to federate altogether in such cases.
logger.warn(
"Rejecting %s because %s",
e.event_id, err.msg
)
if e == event:
raise
events_to_context[e.event_id].rejected = RejectedReason.AUTH_ERROR
yield self.store.persist_events(
[
(e, events_to_context[e.event_id])
for e in itertools.chain(auth_events, state)
],
)
new_event_context = yield self.state_handler.compute_event_context(
event, old_state=state
)
event_stream_id, max_stream_id = yield self.store.persist_event(
event, new_event_context,
current_state=state,
)
defer.returnValue((event_stream_id, max_stream_id))
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@defer.inlineCallbacks
def _prep_event(self, origin, event, state=None, auth_events=None):
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context = yield self.state_handler.compute_event_context(
event, old_state=state,
)
if not auth_events:
auth_events = context.current_state
# This is a hack to fix some old rooms where the initial join event
# didn't reference the create event in its auth events.
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if event.type == EventTypes.Member and not event.auth_events:
if len(event.prev_events) == 1 and event.depth < 5:
c = yield self.store.get_event(
event.prev_events[0][0],
allow_none=True,
)
if c and c.type == EventTypes.Create:
auth_events[(c.type, c.state_key)] = c
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try:
yield self.do_auth(
origin, event, context, auth_events=auth_events
)
except AuthError as e:
logger.warn(
"Rejecting %s because %s",
event.event_id, e.msg
)
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context.rejected = RejectedReason.AUTH_ERROR
if event.type == EventTypes.GuestAccess:
full_context = yield self.store.get_current_state(room_id=event.room_id)
yield self.maybe_kick_guest_users(event, full_context)
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defer.returnValue(context)
@defer.inlineCallbacks
def on_query_auth(self, origin, event_id, remote_auth_chain, rejects,
missing):
# Just go through and process each event in `remote_auth_chain`. We
# don't want to fall into the trap of `missing` being wrong.
for e in remote_auth_chain:
try:
yield self._handle_new_event(origin, e)
except AuthError:
pass
# Now get the current auth_chain for the event.
local_auth_chain = yield self.store.get_auth_chain([event_id])
# TODO: Check if we would now reject event_id. If so we need to tell
# everyone.
ret = yield self.construct_auth_difference(
local_auth_chain, remote_auth_chain
)
for event in ret["auth_chain"]:
event.signatures.update(
compute_event_signature(
event,
self.hs.hostname,
self.hs.config.signing_key[0]
)
)
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logger.debug("on_query_auth returning: %s", ret)
defer.returnValue(ret)
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@defer.inlineCallbacks
def on_get_missing_events(self, origin, room_id, earliest_events,
latest_events, limit, min_depth):
in_room = yield self.auth.check_host_in_room(
room_id,
origin
)
if not in_room:
raise AuthError(403, "Host not in room.")
limit = min(limit, 20)
min_depth = max(min_depth, 0)
missing_events = yield self.store.get_missing_events(
room_id=room_id,
earliest_events=earliest_events,
latest_events=latest_events,
limit=limit,
min_depth=min_depth,
)
defer.returnValue(missing_events)
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@defer.inlineCallbacks
@log_function
def do_auth(self, origin, event, context, auth_events):
# Check if we have all the auth events.
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current_state = set(e.event_id for e in auth_events.values())
event_auth_events = set(e_id for e_id, _ in event.auth_events)
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if event_auth_events - current_state:
have_events = yield self.store.have_events(
event_auth_events - current_state
)
else:
have_events = {}
have_events.update({
e.event_id: ""
for e in auth_events.values()
})
seen_events = set(have_events.keys())
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missing_auth = event_auth_events - seen_events - current_state
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if missing_auth:
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logger.info("Missing auth: %s", missing_auth)
# If we don't have all the auth events, we need to get them.
try:
remote_auth_chain = yield self.replication_layer.get_event_auth(
origin, event.room_id, event.event_id
)
seen_remotes = yield self.store.have_events(
[e.event_id for e in remote_auth_chain]
)
for e in remote_auth_chain:
if e.event_id in seen_remotes.keys():
continue
if e.event_id == event.event_id:
continue
try:
auth_ids = [e_id for e_id, _ in e.auth_events]
auth = {
(e.type, e.state_key): e for e in remote_auth_chain
if e.event_id in auth_ids or e.type == EventTypes.Create
}
e.internal_metadata.outlier = True
logger.debug(
"do_auth %s missing_auth: %s",
event.event_id, e.event_id
)
yield self._handle_new_event(
origin, e, auth_events=auth
)
if e.event_id in event_auth_events:
auth_events[(e.type, e.state_key)] = e
except AuthError:
pass
have_events = yield self.store.have_events(
[e_id for e_id, _ in event.auth_events]
)
seen_events = set(have_events.keys())
except:
# FIXME:
logger.exception("Failed to get auth chain")
# FIXME: Assumes we have and stored all the state for all the
# prev_events
current_state = set(e.event_id for e in auth_events.values())
different_auth = event_auth_events - current_state
if different_auth and not event.internal_metadata.is_outlier():
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# Do auth conflict res.
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logger.info("Different auth: %s", different_auth)
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different_events = yield defer.gatherResults(
[
self.store.get_event(
d,
allow_none=True,
allow_rejected=False,
)
for d in different_auth
if d in have_events and not have_events[d]
],
consumeErrors=True
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).addErrback(unwrapFirstError)
if different_events:
local_view = dict(auth_events)
remote_view = dict(auth_events)
remote_view.update({
(d.type, d.state_key): d for d in different_events
})
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new_state, prev_state = self.state_handler.resolve_events(
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[local_view.values(), remote_view.values()],
event
)
auth_events.update(new_state)
current_state = set(e.event_id for e in auth_events.values())
different_auth = event_auth_events - current_state
context.current_state.update(auth_events)
context.state_group = None
if different_auth and not event.internal_metadata.is_outlier():
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logger.info("Different auth after resolution: %s", different_auth)
# Only do auth resolution if we have something new to say.
# We can't rove an auth failure.
do_resolution = False
provable = [
RejectedReason.NOT_ANCESTOR, RejectedReason.NOT_ANCESTOR,
]
for e_id in different_auth:
if e_id in have_events:
if have_events[e_id] in provable:
do_resolution = True
break
if do_resolution:
# 1. Get what we think is the auth chain.
auth_ids = self.auth.compute_auth_events(
event, context.current_state
)
local_auth_chain = yield self.store.get_auth_chain(auth_ids)
try:
# 2. Get remote difference.
result = yield self.replication_layer.query_auth(
origin,
event.room_id,
event.event_id,
local_auth_chain,
)
seen_remotes = yield self.store.have_events(
[e.event_id for e in result["auth_chain"]]
)
# 3. Process any remote auth chain events we haven't seen.
for ev in result["auth_chain"]:
if ev.event_id in seen_remotes.keys():
continue
if ev.event_id == event.event_id:
continue
try:
auth_ids = [e_id for e_id, _ in ev.auth_events]
auth = {
(e.type, e.state_key): e
for e in result["auth_chain"]
if e.event_id in auth_ids
or event.type == EventTypes.Create
}
ev.internal_metadata.outlier = True
logger.debug(
"do_auth %s different_auth: %s",
event.event_id, e.event_id
)
yield self._handle_new_event(
origin, ev, auth_events=auth
)
if ev.event_id in event_auth_events:
auth_events[(ev.type, ev.state_key)] = ev
except AuthError:
pass
except:
# FIXME:
logger.exception("Failed to query auth chain")
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# 4. Look at rejects and their proofs.
# TODO.
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context.current_state.update(auth_events)
context.state_group = None
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try:
self.auth.check(event, auth_events=auth_events)
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except AuthError as e:
logger.warn("Failed auth resolution for %r because %s", event, e)
raise e
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@defer.inlineCallbacks
def construct_auth_difference(self, local_auth, remote_auth):
""" Given a local and remote auth chain, find the differences. This
assumes that we have already processed all events in remote_auth
Params:
local_auth (list)
remote_auth (list)
Returns:
dict
"""
logger.debug("construct_auth_difference Start!")
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# TODO: Make sure we are OK with local_auth or remote_auth having more
# auth events in them than strictly necessary.
def sort_fun(ev):
return ev.depth, ev.event_id
logger.debug("construct_auth_difference after sort_fun!")
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# We find the differences by starting at the "bottom" of each list
# and iterating up on both lists. The lists are ordered by depth and
# then event_id, we iterate up both lists until we find the event ids
# don't match. Then we look at depth/event_id to see which side is
# missing that event, and iterate only up that list. Repeat.
remote_list = list(remote_auth)
remote_list.sort(key=sort_fun)
local_list = list(local_auth)
local_list.sort(key=sort_fun)
local_iter = iter(local_list)
remote_iter = iter(remote_list)
logger.debug("construct_auth_difference before get_next!")
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def get_next(it, opt=None):
try:
return it.next()
except:
return opt
current_local = get_next(local_iter)
current_remote = get_next(remote_iter)
logger.debug("construct_auth_difference before while")
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missing_remotes = []
missing_locals = []
while current_local or current_remote:
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if current_remote is None:
missing_locals.append(current_local)
current_local = get_next(local_iter)
continue
if current_local is None:
missing_remotes.append(current_remote)
current_remote = get_next(remote_iter)
continue
if current_local.event_id == current_remote.event_id:
current_local = get_next(local_iter)
current_remote = get_next(remote_iter)
continue
if current_local.depth < current_remote.depth:
missing_locals.append(current_local)
current_local = get_next(local_iter)
continue
if current_local.depth > current_remote.depth:
missing_remotes.append(current_remote)
current_remote = get_next(remote_iter)
continue
# They have the same depth, so we fall back to the event_id order
if current_local.event_id < current_remote.event_id:
missing_locals.append(current_local)
current_local = get_next(local_iter)
if current_local.event_id > current_remote.event_id:
missing_remotes.append(current_remote)
current_remote = get_next(remote_iter)
continue
logger.debug("construct_auth_difference after while")
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# missing locals should be sent to the server
# We should find why we are missing remotes, as they will have been
# rejected.
# Remove events from missing_remotes if they are referencing a missing
# remote. We only care about the "root" rejected ones.
missing_remote_ids = [e.event_id for e in missing_remotes]
base_remote_rejected = list(missing_remotes)
for e in missing_remotes:
for e_id, _ in e.auth_events:
if e_id in missing_remote_ids:
try:
base_remote_rejected.remove(e)
except ValueError:
pass
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reason_map = {}
for e in base_remote_rejected:
reason = yield self.store.get_rejection_reason(e.event_id)
if reason is None:
# TODO: e is not in the current state, so we should
# construct some proof of that.
continue
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reason_map[e.event_id] = reason
if reason == RejectedReason.AUTH_ERROR:
pass
elif reason == RejectedReason.REPLACED:
# TODO: Get proof
pass
elif reason == RejectedReason.NOT_ANCESTOR:
# TODO: Get proof.
pass
logger.debug("construct_auth_difference returning")
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defer.returnValue({
"auth_chain": local_auth,
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"rejects": {
e.event_id: {
"reason": reason_map[e.event_id],
"proof": None,
}
for e in base_remote_rejected
},
"missing": [e.event_id for e in missing_locals],
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})
@defer.inlineCallbacks
@log_function
def exchange_third_party_invite(
self,
sender_user_id,
target_user_id,
room_id,
signed,
):
third_party_invite = {
"signed": signed,
}
event_dict = {
"type": EventTypes.Member,
"content": {
"membership": Membership.INVITE,
"third_party_invite": third_party_invite,
},
"room_id": room_id,
"sender": sender_user_id,
"state_key": target_user_id,
}
if (yield self.auth.check_host_in_room(room_id, self.hs.hostname)):
builder = self.event_builder_factory.new(event_dict)
EventValidator().validate_new(builder)
message_handler = self.hs.get_handlers().message_handler
event, context = yield message_handler._create_new_client_event(
builder=builder
)
event, context = yield self.add_display_name_to_third_party_invite(
event_dict, event, context
)
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try:
self.auth.check(event, context.current_state)
except AuthError as e:
logger.warn("Denying new third party invite %r because %s", event, e)
raise e
yield self._check_signature(event, auth_events=context.current_state)
member_handler = self.hs.get_handlers().room_member_handler
yield member_handler.send_membership_event(None, event, context)
else:
destinations = set(x.split(":", 1)[-1] for x in (sender_user_id, room_id))
yield self.replication_layer.forward_third_party_invite(
destinations,
room_id,
event_dict,
)
@defer.inlineCallbacks
@log_function
def on_exchange_third_party_invite_request(self, origin, room_id, event_dict):
builder = self.event_builder_factory.new(event_dict)
message_handler = self.hs.get_handlers().message_handler
event, context = yield message_handler._create_new_client_event(
builder=builder,
)
event, context = yield self.add_display_name_to_third_party_invite(
event_dict, event, context
)
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try:
self.auth.check(event, auth_events=context.current_state)
except AuthError as e:
logger.warn("Denying third party invite %r because %s", event, e)
raise e
yield self._check_signature(event, auth_events=context.current_state)
returned_invite = yield self.send_invite(origin, event)
# TODO: Make sure the signatures actually are correct.
event.signatures.update(returned_invite.signatures)
member_handler = self.hs.get_handlers().room_member_handler
yield member_handler.send_membership_event(None, event, context)
@defer.inlineCallbacks
def add_display_name_to_third_party_invite(self, event_dict, event, context):
key = (
EventTypes.ThirdPartyInvite,
event.content["third_party_invite"]["signed"]["token"]
)
original_invite = context.current_state.get(key)
if not original_invite:
logger.info(
"Could not find invite event for third_party_invite - "
"discarding: %s" % (event_dict,)
)
return
display_name = original_invite.content["display_name"]
event_dict["content"]["third_party_invite"]["display_name"] = display_name
builder = self.event_builder_factory.new(event_dict)
EventValidator().validate_new(builder)
message_handler = self.hs.get_handlers().message_handler
event, context = yield message_handler._create_new_client_event(builder=builder)
defer.returnValue((event, context))
@defer.inlineCallbacks
def _check_signature(self, event, auth_events):
"""
Checks that the signature in the event is consistent with its invite.
Args:
event (Event): The m.room.member event to check
auth_events (dict<(event type, state_key), event>):
Raises:
AuthError: if signature didn't match any keys, or key has been
revoked,
SynapseError: if a transient error meant a key couldn't be checked
for revocation.
"""
signed = event.content["third_party_invite"]["signed"]
token = signed["token"]
invite_event = auth_events.get(
(EventTypes.ThirdPartyInvite, token,)
)
if not invite_event:
raise AuthError(403, "Could not find invite")
last_exception = None
for public_key_object in self.hs.get_auth().get_public_keys(invite_event):
try:
for server, signature_block in signed["signatures"].items():
for key_name, encoded_signature in signature_block.items():
if not key_name.startswith("ed25519:"):
continue
public_key = public_key_object["public_key"]
verify_key = decode_verify_key_bytes(
key_name,
decode_base64(public_key)
)
verify_signed_json(signed, server, verify_key)
if "key_validity_url" in public_key_object:
yield self._check_key_revocation(
public_key,
public_key_object["key_validity_url"]
)
return
except Exception as e:
last_exception = e
raise last_exception
@defer.inlineCallbacks
def _check_key_revocation(self, public_key, url):
"""
Checks whether public_key has been revoked.
Args:
public_key (str): base-64 encoded public key.
url (str): Key revocation URL.
Raises:
AuthError: if they key has been revoked.
SynapseError: if a transient error meant a key couldn't be checked
for revocation.
"""
try:
response = yield self.hs.get_simple_http_client().get_json(
url,
{"public_key": public_key}
)
except Exception:
raise SynapseError(
502,
"Third party certificate could not be checked"
)
if "valid" not in response or not response["valid"]:
raise AuthError(403, "Third party certificate was invalid")