diff options
Diffstat (limited to 'synapse/event_auth.py')
| -rw-r--r-- | synapse/event_auth.py | 88 |
1 files changed, 55 insertions, 33 deletions
diff --git a/synapse/event_auth.py b/synapse/event_auth.py index 46beb533..c5823551 100644 --- a/synapse/event_auth.py +++ b/synapse/event_auth.py @@ -15,7 +15,7 @@ # limitations under the License. import logging -from typing import Set, Tuple +from typing import List, Optional, Set, Tuple from canonicaljson import encode_canonical_json from signedjson.key import decode_verify_key_bytes @@ -29,18 +29,19 @@ from synapse.api.room_versions import ( EventFormatVersions, RoomVersion, ) -from synapse.types import UserID, get_domain_from_id +from synapse.events import EventBase +from synapse.types import StateMap, UserID, get_domain_from_id logger = logging.getLogger(__name__) def check( room_version_obj: RoomVersion, - event, - auth_events, - do_sig_check=True, - do_size_check=True, -): + event: EventBase, + auth_events: StateMap[EventBase], + do_sig_check: bool = True, + do_size_check: bool = True, +) -> None: """ Checks if this event is correctly authed. Args: @@ -181,7 +182,7 @@ def check( _can_send_event(event, auth_events) if event.type == EventTypes.PowerLevels: - _check_power_levels(event, auth_events) + _check_power_levels(room_version_obj, event, auth_events) if event.type == EventTypes.Redaction: check_redaction(room_version_obj, event, auth_events) @@ -189,7 +190,7 @@ def check( logger.debug("Allowing! %s", event) -def _check_size_limits(event): +def _check_size_limits(event: EventBase) -> None: def too_big(field): raise EventSizeError("%s too large" % (field,)) @@ -207,13 +208,18 @@ def _check_size_limits(event): too_big("event") -def _can_federate(event, auth_events): +def _can_federate(event: EventBase, auth_events: StateMap[EventBase]) -> bool: creation_event = auth_events.get((EventTypes.Create, "")) + # There should always be a creation event, but if not don't federate. + if not creation_event: + return False return creation_event.content.get("m.federate", True) is True -def _is_membership_change_allowed(event, auth_events): +def _is_membership_change_allowed( + event: EventBase, auth_events: StateMap[EventBase] +) -> None: membership = event.content["membership"] # Check if this is the room creator joining: @@ -339,21 +345,25 @@ def _is_membership_change_allowed(event, auth_events): raise AuthError(500, "Unknown membership %s" % membership) -def _check_event_sender_in_room(event, auth_events): +def _check_event_sender_in_room( + event: EventBase, auth_events: StateMap[EventBase] +) -> None: key = (EventTypes.Member, event.user_id) member_event = auth_events.get(key) - return _check_joined_room(member_event, event.user_id, event.room_id) + _check_joined_room(member_event, event.user_id, event.room_id) -def _check_joined_room(member, user_id, room_id): +def _check_joined_room(member: Optional[EventBase], user_id: str, room_id: str) -> None: if not member or member.membership != Membership.JOIN: raise AuthError( 403, "User %s not in room %s (%s)" % (user_id, room_id, repr(member)) ) -def get_send_level(etype, state_key, power_levels_event): +def get_send_level( + etype: str, state_key: Optional[str], power_levels_event: Optional[EventBase] +) -> int: """Get the power level required to send an event of a given type The federation spec [1] refers to this as "Required Power Level". @@ -361,13 +371,13 @@ def get_send_level(etype, state_key, power_levels_event): https://matrix.org/docs/spec/server_server/unstable.html#definitions Args: - etype (str): type of event - state_key (str|None): state_key of state event, or None if it is not + etype: type of event + state_key: state_key of state event, or None if it is not a state event. - power_levels_event (synapse.events.EventBase|None): power levels event + power_levels_event: power levels event in force at this point in the room Returns: - int: power level required to send this event. + power level required to send this event. """ if power_levels_event: @@ -388,7 +398,7 @@ def get_send_level(etype, state_key, power_levels_event): return int(send_level) -def _can_send_event(event, auth_events): +def _can_send_event(event: EventBase, auth_events: StateMap[EventBase]) -> bool: power_levels_event = _get_power_level_event(auth_events) send_level = get_send_level(event.type, event.get("state_key"), power_levels_event) @@ -410,7 +420,9 @@ def _can_send_event(event, auth_events): return True -def check_redaction(room_version_obj: RoomVersion, event, auth_events): +def check_redaction( + room_version_obj: RoomVersion, event: EventBase, auth_events: StateMap[EventBase], +) -> bool: """Check whether the event sender is allowed to redact the target event. Returns: @@ -442,7 +454,9 @@ def check_redaction(room_version_obj: RoomVersion, event, auth_events): raise AuthError(403, "You don't have permission to redact events") -def _check_power_levels(event, auth_events): +def _check_power_levels( + room_version_obj: RoomVersion, event: EventBase, auth_events: StateMap[EventBase], +) -> None: user_list = event.content.get("users", {}) # Validate users for k, v in user_list.items(): @@ -473,7 +487,7 @@ def _check_power_levels(event, auth_events): ("redact", None), ("kick", None), ("invite", None), - ] + ] # type: List[Tuple[str, Optional[str]]] old_list = current_state.content.get("users", {}) for user in set(list(old_list) + list(user_list)): @@ -484,6 +498,14 @@ def _check_power_levels(event, auth_events): for ev_id in set(list(old_list) + list(new_list)): levels_to_check.append((ev_id, "events")) + # MSC2209 specifies these checks should also be done for the "notifications" + # key. + if room_version_obj.limit_notifications_power_levels: + old_list = current_state.content.get("notifications", {}) + new_list = event.content.get("notifications", {}) + for ev_id in set(list(old_list) + list(new_list)): + levels_to_check.append((ev_id, "notifications")) + old_state = current_state.content new_state = event.content @@ -495,12 +517,12 @@ def _check_power_levels(event, auth_events): new_loc = new_loc.get(dir, {}) if level_to_check in old_loc: - old_level = int(old_loc[level_to_check]) + old_level = int(old_loc[level_to_check]) # type: Optional[int] else: old_level = None if level_to_check in new_loc: - new_level = int(new_loc[level_to_check]) + new_level = int(new_loc[level_to_check]) # type: Optional[int] else: new_level = None @@ -526,21 +548,21 @@ def _check_power_levels(event, auth_events): ) -def _get_power_level_event(auth_events): +def _get_power_level_event(auth_events: StateMap[EventBase]) -> Optional[EventBase]: return auth_events.get((EventTypes.PowerLevels, "")) -def get_user_power_level(user_id, auth_events): +def get_user_power_level(user_id: str, auth_events: StateMap[EventBase]) -> int: """Get a user's power level Args: - user_id (str): user's id to look up in power_levels - auth_events (dict[(str, str), synapse.events.EventBase]): + user_id: user's id to look up in power_levels + auth_events: state in force at this point in the room (or rather, a subset of it including at least the create event and power levels event. Returns: - int: the user's power level in this room. + the user's power level in this room. """ power_level_event = _get_power_level_event(auth_events) if power_level_event: @@ -566,7 +588,7 @@ def get_user_power_level(user_id, auth_events): return 0 -def _get_named_level(auth_events, name, default): +def _get_named_level(auth_events: StateMap[EventBase], name: str, default: int) -> int: power_level_event = _get_power_level_event(auth_events) if not power_level_event: @@ -579,7 +601,7 @@ def _get_named_level(auth_events, name, default): return default -def _verify_third_party_invite(event, auth_events): +def _verify_third_party_invite(event: EventBase, auth_events: StateMap[EventBase]): """ Validates that the invite event is authorized by a previous third-party invite. @@ -654,7 +676,7 @@ def get_public_keys(invite_event): return public_keys -def auth_types_for_event(event) -> Set[Tuple[str, str]]: +def auth_types_for_event(event: EventBase) -> Set[Tuple[str, str]]: """Given an event, return a list of (EventType, StateKey) that may be needed to auth the event. The returned list may be a superset of what would actually be required depending on the full state of the room. |