diff options
| -rw-r--r-- | changelog.d/6556.bugfix | 1 | ||||
| -rw-r--r-- | synapse/api/auth.py | 101 |
2 files changed, 35 insertions, 67 deletions
diff --git a/changelog.d/6556.bugfix b/changelog.d/6556.bugfix new file mode 100644 index 0000000000..e75639f5b4 --- /dev/null +++ b/changelog.d/6556.bugfix @@ -0,0 +1 @@ +Fix a cause of state resets in room versions 2 onwards. diff --git a/synapse/api/auth.py b/synapse/api/auth.py index 5d0b7d2801..9fd52a8c77 100644 --- a/synapse/api/auth.py +++ b/synapse/api/auth.py @@ -14,6 +14,7 @@ # limitations under the License. import logging +from typing import Dict, Tuple from six import itervalues @@ -25,13 +26,7 @@ from twisted.internet import defer import synapse.logging.opentracing as opentracing import synapse.types from synapse import event_auth -from synapse.api.constants import ( - EventTypes, - JoinRules, - LimitBlockingTypes, - Membership, - UserTypes, -) +from synapse.api.constants import EventTypes, LimitBlockingTypes, Membership, UserTypes from synapse.api.errors import ( AuthError, Codes, @@ -513,71 +508,43 @@ class Auth(object): """ return self.store.is_server_admin(user) - @defer.inlineCallbacks - def compute_auth_events(self, event, current_state_ids, for_verification=False): - if event.type == EventTypes.Create: - return [] - - auth_ids = [] - - key = (EventTypes.PowerLevels, "") - power_level_event_id = current_state_ids.get(key) - - if power_level_event_id: - auth_ids.append(power_level_event_id) - - key = (EventTypes.JoinRules, "") - join_rule_event_id = current_state_ids.get(key) + def compute_auth_events( + self, + event, + current_state_ids: Dict[Tuple[str, str], str], + for_verification: bool = False, + ): + """Given an event and current state return the list of event IDs used + to auth an event. - key = (EventTypes.Member, event.sender) - member_event_id = current_state_ids.get(key) + If `for_verification` is False then only return auth events that + should be added to the event's `auth_events`. - key = (EventTypes.Create, "") - create_event_id = current_state_ids.get(key) - if create_event_id: - auth_ids.append(create_event_id) + Returns: + defer.Deferred(list[str]): List of event IDs. + """ - if join_rule_event_id: - join_rule_event = yield self.store.get_event(join_rule_event_id) - join_rule = join_rule_event.content.get("join_rule") - is_public = join_rule == JoinRules.PUBLIC if join_rule else False - else: - is_public = False + if event.type == EventTypes.Create: + return defer.succeed([]) + + # Currently we ignore the `for_verification` flag even though there are + # some situations where we can drop particular auth events when adding + # to the event's `auth_events` (e.g. joins pointing to previous joins + # when room is publically joinable). Dropping event IDs has the + # advantage that the auth chain for the room grows slower, but we use + # the auth chain in state resolution v2 to order events, which means + # care must be taken if dropping events to ensure that it doesn't + # introduce undesirable "state reset" behaviour. + # + # All of which sounds a bit tricky so we don't bother for now. - if event.type == EventTypes.Member: - e_type = event.content["membership"] - if e_type in [Membership.JOIN, Membership.INVITE]: - if join_rule_event_id: - auth_ids.append(join_rule_event_id) + auth_ids = [] + for etype, state_key in event_auth.auth_types_for_event(event): + auth_ev_id = current_state_ids.get((etype, state_key)) + if auth_ev_id: + auth_ids.append(auth_ev_id) - if e_type == Membership.JOIN: - if member_event_id and not is_public: - auth_ids.append(member_event_id) - else: - if member_event_id: - auth_ids.append(member_event_id) - - if for_verification: - key = (EventTypes.Member, event.state_key) - existing_event_id = current_state_ids.get(key) - if existing_event_id: - auth_ids.append(existing_event_id) - - if e_type == Membership.INVITE: - if "third_party_invite" in event.content: - key = ( - EventTypes.ThirdPartyInvite, - event.content["third_party_invite"]["signed"]["token"], - ) - third_party_invite_id = current_state_ids.get(key) - if third_party_invite_id: - auth_ids.append(third_party_invite_id) - elif member_event_id: - member_event = yield self.store.get_event(member_event_id) - if member_event.content["membership"] == Membership.JOIN: - auth_ids.append(member_event.event_id) - - return auth_ids + return defer.succeed(auth_ids) @defer.inlineCallbacks def check_can_change_room_list(self, room_id, user): |