Store rejected remote invite events as outliers

Currently they're stored as non-outliers even though the server isn't in
the room, which can be problematic in places where the code assumes it
has the state for all non outlier events.

In particular, there is an edge case where persisting the leave event
triggers a state resolution, which requires looking up the room version
from state. Since the server doesn't have the state, this causes an
exception to be thrown.
This commit is contained in:
Erik Johnston 2019-01-16 15:13:07 +00:00
parent 6b90ae6efc
commit 886e5acc76
3 changed files with 21 additions and 38 deletions

View File

@ -32,7 +32,6 @@ from synapse.api.errors import (
HttpResponseException,
SynapseError,
)
from synapse.events import builder
from synapse.federation.federation_base import FederationBase, event_from_pdu_json
from synapse.util import logcontext, unwrapFirstError
from synapse.util.caches.expiringcache import ExpiringCache
@ -66,6 +65,8 @@ class FederationClient(FederationBase):
self.state = hs.get_state_handler()
self.transport_layer = hs.get_federation_transport_client()
self.event_builder_factory = hs.get_event_builder_factory()
self._get_pdu_cache = ExpiringCache(
cache_name="get_pdu_cache",
clock=self._clock,
@ -571,7 +572,12 @@ class FederationClient(FederationBase):
if "prev_state" not in pdu_dict:
pdu_dict["prev_state"] = []
ev = builder.EventBuilder(pdu_dict)
# Strip off the fields that we want to clobber.
pdu_dict.pop("origin", None)
pdu_dict.pop("origin_server_ts", None)
pdu_dict.pop("unsigned", None)
ev = self.event_builder_factory.new(pdu_dict)
defer.returnValue(
(destination, ev)

View File

@ -43,10 +43,7 @@ from synapse.api.errors import (
StoreError,
SynapseError,
)
from synapse.crypto.event_signing import (
add_hashes_and_signatures,
compute_event_signature,
)
from synapse.crypto.event_signing import compute_event_signature
from synapse.events.validator import EventValidator
from synapse.replication.http.federation import (
ReplicationCleanRoomRestServlet,
@ -58,7 +55,6 @@ from synapse.types import UserID, get_domain_from_id
from synapse.util import logcontext, unwrapFirstError
from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room
from synapse.util.frozenutils import unfreeze
from synapse.util.logutils import log_function
from synapse.util.retryutils import NotRetryingDestination
from synapse.visibility import filter_events_for_server
@ -1083,7 +1079,9 @@ class FederationHandler(BaseHandler):
handled_events = set()
try:
event = self._sign_event(event)
self._sign_event(event)
event.internal_metadata.outlier = False
# Try the host we successfully got a response to /make_join/
# request first.
try:
@ -1289,13 +1287,7 @@ class FederationHandler(BaseHandler):
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]
)
)
self._sign_event(event)
context = yield self.state_handler.compute_event_context(event)
yield self.persist_events_and_notify([(event, context)])
@ -1313,7 +1305,7 @@ class FederationHandler(BaseHandler):
# Mark as outlier as we don't have any state for this event; we're not
# even in the room.
event.internal_metadata.outlier = True
event = self._sign_event(event)
self._sign_event(event)
# Try the host that we succesfully called /make_leave/ on first for
# the /send_leave/ request.
@ -1358,26 +1350,14 @@ class FederationHandler(BaseHandler):
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())
event.signatures.update(
compute_event_signature(
event,
self.hs.hostname,
self.hs.config.signing_key[0]
)
)
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):

View File

@ -591,10 +591,7 @@ class RoomMemberStore(RoomMemberWorkerStore):
# i.e., its something that has just happened.
# The only current event that can also be an outlier is if its an
# invite that has come in across federation.
is_new_state = not backfilled and (
not event.internal_metadata.is_outlier()
or event.internal_metadata.is_invite_from_remote()
)
is_new_state = not backfilled
is_mine = self.hs.is_mine_id(event.state_key)
if is_new_state and is_mine:
if event.membership == Membership.INVITE: