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Check *all* auth events for room id and rejection (#11009)

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This fixes a bug where we would accept an event whose `auth_events` include
rejected events, if the rejected event was shadowed by another `auth_event`
with same `(type, state_key)`.

The approach is to pass a list of auth events into
`check_auth_rules_for_event` instead of a dict, which of course means updating
the call sites.

This is an extension of #10956.
This commit is contained in:
Richard van der Hoff 2021-10-18 19:28:30 +02:00 • committed by GitHub
parent 73743b8ad1
commit a5d2ea3d08
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8 changed files with 122 additions and 85 deletions
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33
synapse/event_auth.py
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@ -14,7 +14,7 @@
# limitations under the License.
import logging
from typing import Any, Dict, List, Optional, Set, Tuple, Union
from typing import Any, Dict, Iterable, List, Optional, Set, Tuple, Union
from canonicaljson import encode_canonical_json
from signedjson.key import decode_verify_key_bytes
@ -113,7 +113,7 @@ def validate_event_for_room_version(
def check_auth_rules_for_event(
room_version_obj: RoomVersion, event: EventBase, auth_events: StateMap[EventBase]
room_version_obj: RoomVersion, event: EventBase, auth_events: Iterable[EventBase]
) -> None:
"""Check that an event complies with the auth rules
@ -137,8 +137,6 @@ def check_auth_rules_for_event(
Raises:
AuthError if the checks fail
"""
assert isinstance(auth_events, dict)
# We need to ensure that the auth events are actually for the same room, to
# stop people from using powers they've been granted in other rooms for
# example.
@ -147,7 +145,7 @@ def check_auth_rules_for_event(
# the state res algorithm isn't silly enough to give us events from different rooms.
# Still, it's easier to do it anyway.
room_id = event.room_id
for auth_event in auth_events.values():
for auth_event in auth_events:
if auth_event.room_id != room_id:
raise AuthError(
403,
@ -186,8 +184,10 @@ def check_auth_rules_for_event(
logger.debug("Allowing! %s", event)
return
auth_dict = {(e.type, e.state_key): e for e in auth_events}
# 3. If event does not have a m.room.create in its auth_events, reject.
creation_event = auth_events.get((EventTypes.Create, ""), None)
creation_event = auth_dict.get((EventTypes.Create, ""), None)
if not creation_event:
raise AuthError(403, "No create event in auth events")
@ -195,7 +195,7 @@ def check_auth_rules_for_event(
creating_domain = get_domain_from_id(event.room_id)
originating_domain = get_domain_from_id(event.sender)
if creating_domain != originating_domain:
if not _can_federate(event, auth_events):
if not _can_federate(event, auth_dict):
raise AuthError(403, "This room has been marked as unfederatable.")
# 4. If type is m.room.aliases
@ -217,23 +217,20 @@ def check_auth_rules_for_event(
logger.debug("Allowing! %s", event)
return
if logger.isEnabledFor(logging.DEBUG):
logger.debug("Auth events: %s", [a.event_id for a in auth_events.values()])
# 5. If type is m.room.membership
if event.type == EventTypes.Member:
_is_membership_change_allowed(room_version_obj, event, auth_events)
_is_membership_change_allowed(room_version_obj, event, auth_dict)
logger.debug("Allowing! %s", event)
return
_check_event_sender_in_room(event, auth_events)
_check_event_sender_in_room(event, auth_dict)
# Special case to allow m.room.third_party_invite events wherever
# a user is allowed to issue invites. Fixes
# https://github.com/vector-im/vector-web/issues/1208 hopefully
if event.type == EventTypes.ThirdPartyInvite:
user_level = get_user_power_level(event.user_id, auth_events)
invite_level = get_named_level(auth_events, "invite", 0)
user_level = get_user_power_level(event.user_id, auth_dict)
invite_level = get_named_level(auth_dict, "invite", 0)
if user_level < invite_level:
raise AuthError(403, "You don't have permission to invite users")
@ -241,20 +238,20 @@ def check_auth_rules_for_event(
logger.debug("Allowing! %s", event)
return
_can_send_event(event, auth_events)
_can_send_event(event, auth_dict)
if event.type == EventTypes.PowerLevels:
_check_power_levels(room_version_obj, event, auth_events)
_check_power_levels(room_version_obj, event, auth_dict)
if event.type == EventTypes.Redaction:
check_redaction(room_version_obj, event, auth_events)
check_redaction(room_version_obj, event, auth_dict)
if (
event.type == EventTypes.MSC2716_INSERTION
or event.type == EventTypes.MSC2716_BATCH
or event.type == EventTypes.MSC2716_MARKER
):
check_historical(room_version_obj, event, auth_events)
check_historical(room_version_obj, event, auth_dict)
logger.debug("Allowing! %s", event)