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Move _persist_auth_tree into FederationEventHandler (#11115)

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This is just a lift-and-shift, because it fits more naturally here. We do
rename it to `process_remote_join` at the same time though.
This commit is contained in:
Richard van der Hoff 2021-10-19 11:24:09 +02:00 committed by GitHub
parent 0170774b19
commit f3efa0036b
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3 changed files with 120 additions and 125 deletions
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1
changelog.d/11115.misc Normal file
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@ -0,0 +1 @@
Clean up some of the federation event authentication code for clarity.

128
synapse/handlers/federation.py
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@ -15,7 +15,6 @@
"""Contains handlers for federation events."""
import itertools
import logging
from http import HTTPStatus
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union
@ -27,12 +26,7 @@ from unpaddedbase64 import decode_base64
from twisted.internet import defer
from synapse import event_auth
from synapse.api.constants import (
EventContentFields,
EventTypes,
Membership,
RejectedReason,
)
from synapse.api.constants import EventContentFields, EventTypes, Membership
from synapse.api.errors import (
AuthError,
CodeMessageException,
@ -43,12 +37,9 @@ from synapse.api.errors import (
RequestSendFailed,
SynapseError,
)
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion, RoomVersions
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion
from synapse.crypto.event_signing import compute_event_signature
from synapse.event_auth import (
check_auth_rules_for_event,
validate_event_for_room_version,
)
from synapse.event_auth import validate_event_for_room_version
from synapse.events import EventBase
from synapse.events.snapshot import EventContext
from synapse.events.validator import EventValidator
@ -519,7 +510,7 @@ class FederationHandler:
auth_events=auth_chain,
)
max_stream_id = await self._persist_auth_tree(
max_stream_id = await self._federation_event_handler.process_remote_join(
origin, room_id, auth_chain, state, event, room_version_obj
)
@ -1095,117 +1086,6 @@ class FederationHandler:
else:
return None
async def _persist_auth_tree(
self,
origin: str,
room_id: str,
auth_events: List[EventBase],
state: List[EventBase],
event: EventBase,
room_version: RoomVersion,
) -> int:
"""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 separately. Notifies about the persisted events
where appropriate.
Will attempt to fetch missing auth events.
Args:
origin: Where the events came from
room_id,
auth_events
state
event
room_version: The room version we expect this room to have, and
will raise if it doesn't match the version in the create event.
"""
events_to_context = {}
for e in itertools.chain(auth_events, state):
e.internal_metadata.outlier = True
events_to_context[e.event_id] = EventContext.for_outlier()
event_map = {
e.event_id: e for e in itertools.chain(auth_events, state, [event])
}
create_event = None
for e in auth_events:
if (e.type, e.state_key) == (EventTypes.Create, ""):
create_event = e
break
if create_event is None:
# If the state doesn't have a create event then the room is
# invalid, and it would fail auth checks anyway.
raise SynapseError(400, "No create event in state")
room_version_id = create_event.content.get(
"room_version", RoomVersions.V1.identifier
)
if room_version.identifier != room_version_id:
raise SynapseError(400, "Room version mismatch")
missing_auth_events = set()
for e in itertools.chain(auth_events, state, [event]):
for e_id in e.auth_event_ids():
if e_id not in event_map:
missing_auth_events.add(e_id)
for e_id in missing_auth_events:
m_ev = await self.federation_client.get_pdu(
[origin],
e_id,
room_version=room_version,
outlier=True,
timeout=10000,
)
if m_ev and m_ev.event_id == e_id:
event_map[e_id] = m_ev
else:
logger.info("Failed to find auth event %r", e_id)
for e in itertools.chain(auth_events, state, [event]):
auth_for_e = [
event_map[e_id] for e_id in e.auth_event_ids() if e_id in event_map
]
if create_event:
auth_for_e.append(create_event)
try:
validate_event_for_room_version(room_version, e)
check_auth_rules_for_event(room_version, e, 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.warning("Rejecting %s because %s", e.event_id, err.msg)
if e == event:
raise
events_to_context[e.event_id].rejected = RejectedReason.AUTH_ERROR
if auth_events or state:
await self._federation_event_handler.persist_events_and_notify(
room_id,
[
(e, events_to_context[e.event_id])
for e in itertools.chain(auth_events, state)
],
)
new_event_context = await self.state_handler.compute_event_context(
event, old_state=state
)
return await self._federation_event_handler.persist_events_and_notify(
room_id, [(event, new_event_context)]
)
async def on_get_missing_events(
self,
origin: str,

116
synapse/handlers/federation_event.py
View File

@ -12,6 +12,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import itertools
import logging
from http import HTTPStatus
from typing import (
@ -45,7 +46,7 @@ from synapse.api.errors import (
RequestSendFailed,
SynapseError,
)
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion, RoomVersions
from synapse.event_auth import (
auth_types_for_event,
check_auth_rules_for_event,
@ -390,6 +391,119 @@ class FederationEventHandler:
prev_member_event,
)
async def process_remote_join(
self,
origin: str,
room_id: str,
auth_events: List[EventBase],
state: List[EventBase],
event: EventBase,
room_version: RoomVersion,
) -> int:
"""Persists the events returned by a send_join
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 separately. Notifies about the persisted events
where appropriate.
Will attempt to fetch missing auth events.
Args:
origin: Where the events came from
room_id,
auth_events
state
event
room_version: The room version we expect this room to have, and
will raise if it doesn't match the version in the create event.
"""
events_to_context = {}
for e in itertools.chain(auth_events, state):
e.internal_metadata.outlier = True
events_to_context[e.event_id] = EventContext.for_outlier()
event_map = {
e.event_id: e for e in itertools.chain(auth_events, state, [event])
}
create_event = None
for e in auth_events:
if (e.type, e.state_key) == (EventTypes.Create, ""):
create_event = e
break
if create_event is None:
# If the state doesn't have a create event then the room is
# invalid, and it would fail auth checks anyway.
raise SynapseError(400, "No create event in state")
room_version_id = create_event.content.get(
"room_version", RoomVersions.V1.identifier
)
if room_version.identifier != room_version_id:
raise SynapseError(400, "Room version mismatch")
missing_auth_events = set()
for e in itertools.chain(auth_events, state, [event]):
for e_id in e.auth_event_ids():
if e_id not in event_map:
missing_auth_events.add(e_id)
for e_id in missing_auth_events:
m_ev = await self._federation_client.get_pdu(
[origin],
e_id,
room_version=room_version,
outlier=True,
timeout=10000,
)
if m_ev and m_ev.event_id == e_id:
event_map[e_id] = m_ev
else:
logger.info("Failed to find auth event %r", e_id)
for e in itertools.chain(auth_events, state, [event]):
auth_for_e = [
event_map[e_id] for e_id in e.auth_event_ids() if e_id in event_map
]
if create_event:
auth_for_e.append(create_event)
try:
validate_event_for_room_version(room_version, e)
check_auth_rules_for_event(room_version, e, 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.warning("Rejecting %s because %s", e.event_id, err.msg)
if e == event:
raise
events_to_context[e.event_id].rejected = RejectedReason.AUTH_ERROR
if auth_events or state:
await self.persist_events_and_notify(
room_id,
[
(e, events_to_context[e.event_id])
for e in itertools.chain(auth_events, state)
],
)
new_event_context = await self._state_handler.compute_event_context(
event, old_state=state
)
return await self.persist_events_and_notify(
room_id, [(event, new_event_context)]
)
@log_function
async def backfill(
self, dest: str, room_id: str, limit: int, extremities: Iterable[str]