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https://git.anonymousland.org/anonymousland/synapse-product.git
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a683028d81
* Correctly ratelimit invites when creating a room Also allow ratelimiting for more than one action at a time.
1305 lines
49 KiB
Python
1305 lines
49 KiB
Python
# Copyright 2016-2020 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import abc
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import logging
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import random
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from http import HTTPStatus
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from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple
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from synapse import types
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from synapse.api.constants import AccountDataTypes, EventTypes, Membership
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from synapse.api.errors import (
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AuthError,
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Codes,
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LimitExceededError,
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ShadowBanError,
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SynapseError,
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)
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from synapse.api.ratelimiting import Ratelimiter
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from synapse.events import EventBase
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from synapse.events.snapshot import EventContext
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from synapse.types import JsonDict, Requester, RoomAlias, RoomID, StateMap, UserID
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from synapse.util.async_helpers import Linearizer
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from synapse.util.distributor import user_left_room
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from ._base import BaseHandler
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class RoomMemberHandler(metaclass=abc.ABCMeta):
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# TODO(paul): This handler currently contains a messy conflation of
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# low-level API that works on UserID objects and so on, and REST-level
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# API that takes ID strings and returns pagination chunks. These concerns
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# ought to be separated out a lot better.
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self.store = hs.get_datastore()
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self.auth = hs.get_auth()
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self.state_handler = hs.get_state_handler()
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self.config = hs.config
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self.federation_handler = hs.get_federation_handler()
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self.directory_handler = hs.get_directory_handler()
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self.identity_handler = hs.get_identity_handler()
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self.registration_handler = hs.get_registration_handler()
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self.profile_handler = hs.get_profile_handler()
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self.event_creation_handler = hs.get_event_creation_handler()
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self.account_data_handler = hs.get_account_data_handler()
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self.event_auth_handler = hs.get_event_auth_handler()
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self.member_linearizer = Linearizer(name="member")
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self.clock = hs.get_clock()
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self.spam_checker = hs.get_spam_checker()
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self.third_party_event_rules = hs.get_third_party_event_rules()
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self._server_notices_mxid = self.config.server_notices_mxid
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self._enable_lookup = hs.config.enable_3pid_lookup
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self.allow_per_room_profiles = self.config.allow_per_room_profiles
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self._join_rate_limiter_local = Ratelimiter(
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store=self.store,
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clock=self.clock,
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rate_hz=hs.config.ratelimiting.rc_joins_local.per_second,
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burst_count=hs.config.ratelimiting.rc_joins_local.burst_count,
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)
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self._join_rate_limiter_remote = Ratelimiter(
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store=self.store,
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clock=self.clock,
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rate_hz=hs.config.ratelimiting.rc_joins_remote.per_second,
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burst_count=hs.config.ratelimiting.rc_joins_remote.burst_count,
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)
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self._invites_per_room_limiter = Ratelimiter(
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store=self.store,
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clock=self.clock,
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rate_hz=hs.config.ratelimiting.rc_invites_per_room.per_second,
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burst_count=hs.config.ratelimiting.rc_invites_per_room.burst_count,
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)
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self._invites_per_user_limiter = Ratelimiter(
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store=self.store,
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clock=self.clock,
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rate_hz=hs.config.ratelimiting.rc_invites_per_user.per_second,
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burst_count=hs.config.ratelimiting.rc_invites_per_user.burst_count,
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)
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# This is only used to get at ratelimit function, and
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# maybe_kick_guest_users. It's fine there are multiple of these as
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# it doesn't store state.
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self.base_handler = BaseHandler(hs)
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@abc.abstractmethod
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async def _remote_join(
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self,
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requester: Requester,
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remote_room_hosts: List[str],
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room_id: str,
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user: UserID,
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content: dict,
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) -> Tuple[str, int]:
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"""Try and join a room that this server is not in
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Args:
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requester
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remote_room_hosts: List of servers that can be used to join via.
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room_id: Room that we are trying to join
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user: User who is trying to join
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content: A dict that should be used as the content of the join event.
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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async def remote_reject_invite(
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self,
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invite_event_id: str,
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txn_id: Optional[str],
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requester: Requester,
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content: JsonDict,
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) -> Tuple[str, int]:
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"""
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Rejects an out-of-band invite we have received from a remote server
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Args:
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invite_event_id: ID of the invite to be rejected
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txn_id: optional transaction ID supplied by the client
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requester: user making the rejection request, according to the access token
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content: additional content to include in the rejection event.
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Normally an empty dict.
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Returns:
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event id, stream_id of the leave event
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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async def _user_left_room(self, target: UserID, room_id: str) -> None:
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"""Notifies distributor on master process that the user has left the
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room.
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Args:
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target
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room_id
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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async def forget(self, user: UserID, room_id: str) -> None:
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raise NotImplementedError()
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async def ratelimit_multiple_invites(
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self,
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requester: Optional[Requester],
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room_id: Optional[str],
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n_invites: int,
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update: bool = True,
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):
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"""Ratelimit more than one invite sent by the given requester in the given room.
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Args:
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requester: The requester sending the invites.
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room_id: The room the invites are being sent in.
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n_invites: The amount of invites to ratelimit for.
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update: Whether to update the ratelimiter's cache.
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Raises:
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LimitExceededError: The requester can't send that many invites in the room.
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"""
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await self._invites_per_room_limiter.ratelimit(
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requester,
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room_id,
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update=update,
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n_actions=n_invites,
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)
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async def ratelimit_invite(
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self,
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requester: Optional[Requester],
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room_id: Optional[str],
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invitee_user_id: str,
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):
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"""Ratelimit invites by room and by target user.
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If room ID is missing then we just rate limit by target user.
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"""
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if room_id:
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await self._invites_per_room_limiter.ratelimit(requester, room_id)
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await self._invites_per_user_limiter.ratelimit(requester, invitee_user_id)
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async def _local_membership_update(
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self,
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requester: Requester,
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target: UserID,
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room_id: str,
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membership: str,
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prev_event_ids: List[str],
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txn_id: Optional[str] = None,
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ratelimit: bool = True,
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content: Optional[dict] = None,
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require_consent: bool = True,
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) -> Tuple[str, int]:
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user_id = target.to_string()
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if content is None:
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content = {}
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content["membership"] = membership
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if requester.is_guest:
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content["kind"] = "guest"
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# Check if we already have an event with a matching transaction ID. (We
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# do this check just before we persist an event as well, but may as well
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# do it up front for efficiency.)
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if txn_id and requester.access_token_id:
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existing_event_id = await self.store.get_event_id_from_transaction_id(
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room_id,
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requester.user.to_string(),
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requester.access_token_id,
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txn_id,
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)
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if existing_event_id:
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event_pos = await self.store.get_position_for_event(existing_event_id)
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return existing_event_id, event_pos.stream
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event, context = await self.event_creation_handler.create_event(
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requester,
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{
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"type": EventTypes.Member,
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"content": content,
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"room_id": room_id,
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"sender": requester.user.to_string(),
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"state_key": user_id,
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# For backwards compatibility:
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"membership": membership,
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},
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txn_id=txn_id,
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prev_event_ids=prev_event_ids,
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require_consent=require_consent,
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)
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prev_state_ids = await context.get_prev_state_ids()
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prev_member_event_id = prev_state_ids.get((EventTypes.Member, user_id), None)
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if event.membership == Membership.JOIN:
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newly_joined = True
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user_is_invited = False
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if prev_member_event_id:
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prev_member_event = await self.store.get_event(prev_member_event_id)
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newly_joined = prev_member_event.membership != Membership.JOIN
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user_is_invited = prev_member_event.membership == Membership.INVITE
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# If the member is not already in the room and is not accepting an invite,
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# check if they should be allowed access via membership in a space.
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if (
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newly_joined
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and not user_is_invited
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and not await self.event_auth_handler.can_join_without_invite(
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prev_state_ids, event.room_version, user_id
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)
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):
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raise AuthError(
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403,
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"You do not belong to any of the required spaces to join this room.",
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)
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# Only rate-limit if the user actually joined the room, otherwise we'll end
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# up blocking profile updates.
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if newly_joined and ratelimit:
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time_now_s = self.clock.time()
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(
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allowed,
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time_allowed,
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) = await self._join_rate_limiter_local.can_do_action(requester)
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if not allowed:
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raise LimitExceededError(
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retry_after_ms=int(1000 * (time_allowed - time_now_s))
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)
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result_event = await self.event_creation_handler.handle_new_client_event(
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requester,
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event,
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context,
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extra_users=[target],
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ratelimit=ratelimit,
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)
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if event.membership == Membership.LEAVE:
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if prev_member_event_id:
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prev_member_event = await self.store.get_event(prev_member_event_id)
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if prev_member_event.membership == Membership.JOIN:
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await self._user_left_room(target, room_id)
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# we know it was persisted, so should have a stream ordering
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assert result_event.internal_metadata.stream_ordering
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return result_event.event_id, result_event.internal_metadata.stream_ordering
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async def copy_room_tags_and_direct_to_room(
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self, old_room_id, new_room_id, user_id
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) -> None:
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"""Copies the tags and direct room state from one room to another.
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Args:
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old_room_id: The room ID of the old room.
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new_room_id: The room ID of the new room.
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user_id: The user's ID.
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"""
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# Retrieve user account data for predecessor room
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user_account_data, _ = await self.store.get_account_data_for_user(user_id)
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# Copy direct message state if applicable
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direct_rooms = user_account_data.get(AccountDataTypes.DIRECT, {})
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# Check which key this room is under
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if isinstance(direct_rooms, dict):
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for key, room_id_list in direct_rooms.items():
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if old_room_id in room_id_list and new_room_id not in room_id_list:
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# Add new room_id to this key
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direct_rooms[key].append(new_room_id)
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# Save back to user's m.direct account data
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await self.account_data_handler.add_account_data_for_user(
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user_id, AccountDataTypes.DIRECT, direct_rooms
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)
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break
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# Copy room tags if applicable
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room_tags = await self.store.get_tags_for_room(user_id, old_room_id)
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# Copy each room tag to the new room
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for tag, tag_content in room_tags.items():
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await self.account_data_handler.add_tag_to_room(
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user_id, new_room_id, tag, tag_content
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)
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async def update_membership(
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self,
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requester: Requester,
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target: UserID,
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room_id: str,
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action: str,
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txn_id: Optional[str] = None,
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remote_room_hosts: Optional[List[str]] = None,
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third_party_signed: Optional[dict] = None,
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ratelimit: bool = True,
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content: Optional[dict] = None,
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require_consent: bool = True,
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) -> Tuple[str, int]:
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"""Update a user's membership in a room.
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Params:
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requester: The user who is performing the update.
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target: The user whose membership is being updated.
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room_id: The room ID whose membership is being updated.
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action: The membership change, see synapse.api.constants.Membership.
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txn_id: The transaction ID, if given.
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remote_room_hosts: Remote servers to send the update to.
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third_party_signed: Information from a 3PID invite.
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ratelimit: Whether to rate limit the request.
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content: The content of the created event.
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require_consent: Whether consent is required.
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Returns:
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A tuple of the new event ID and stream ID.
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Raises:
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ShadowBanError if a shadow-banned requester attempts to send an invite.
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"""
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if action == Membership.INVITE and requester.shadow_banned:
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# We randomly sleep a bit just to annoy the requester.
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await self.clock.sleep(random.randint(1, 10))
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raise ShadowBanError()
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key = (room_id,)
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with (await self.member_linearizer.queue(key)):
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result = await self.update_membership_locked(
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requester,
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target,
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room_id,
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action,
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txn_id=txn_id,
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remote_room_hosts=remote_room_hosts,
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third_party_signed=third_party_signed,
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ratelimit=ratelimit,
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content=content,
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require_consent=require_consent,
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)
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return result
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async def update_membership_locked(
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self,
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requester: Requester,
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target: UserID,
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room_id: str,
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action: str,
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txn_id: Optional[str] = None,
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remote_room_hosts: Optional[List[str]] = None,
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third_party_signed: Optional[dict] = None,
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ratelimit: bool = True,
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content: Optional[dict] = None,
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require_consent: bool = True,
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) -> Tuple[str, int]:
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"""Helper for update_membership.
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Assumes that the membership linearizer is already held for the room.
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"""
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content_specified = bool(content)
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if content is None:
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content = {}
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else:
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# We do a copy here as we potentially change some keys
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# later on.
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content = dict(content)
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# allow the server notices mxid to set room-level profile
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is_requester_server_notices_user = (
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self._server_notices_mxid is not None
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and requester.user.to_string() == self._server_notices_mxid
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)
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if (
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not self.allow_per_room_profiles and not is_requester_server_notices_user
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) or requester.shadow_banned:
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# Strip profile data, knowing that new profile data will be added to the
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# event's content in event_creation_handler.create_event() using the target's
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# global profile.
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content.pop("displayname", None)
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content.pop("avatar_url", None)
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effective_membership_state = action
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if action in ["kick", "unban"]:
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effective_membership_state = "leave"
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# if this is a join with a 3pid signature, we may need to turn a 3pid
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# invite into a normal invite before we can handle the join.
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if third_party_signed is not None:
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await self.federation_handler.exchange_third_party_invite(
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third_party_signed["sender"],
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target.to_string(),
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room_id,
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third_party_signed,
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)
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if not remote_room_hosts:
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remote_room_hosts = []
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if effective_membership_state not in ("leave", "ban"):
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is_blocked = await self.store.is_room_blocked(room_id)
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if is_blocked:
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raise SynapseError(403, "This room has been blocked on this server")
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if effective_membership_state == Membership.INVITE:
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target_id = target.to_string()
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if ratelimit:
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await self.ratelimit_invite(requester, room_id, target_id)
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# block any attempts to invite the server notices mxid
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if target_id == self._server_notices_mxid:
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raise SynapseError(HTTPStatus.FORBIDDEN, "Cannot invite this user")
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block_invite = False
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if (
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self._server_notices_mxid is not None
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and requester.user.to_string() == self._server_notices_mxid
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):
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# allow the server notices mxid to send invites
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is_requester_admin = True
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else:
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is_requester_admin = await self.auth.is_server_admin(requester.user)
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if not is_requester_admin:
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if self.config.block_non_admin_invites:
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logger.info(
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"Blocking invite: user is not admin and non-admin "
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"invites disabled"
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)
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block_invite = True
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|
|
if not await self.spam_checker.user_may_invite(
|
|
requester.user.to_string(), target_id, room_id
|
|
):
|
|
logger.info("Blocking invite due to spam checker")
|
|
block_invite = True
|
|
|
|
if block_invite:
|
|
raise SynapseError(403, "Invites have been disabled on this server")
|
|
|
|
latest_event_ids = await self.store.get_prev_events_for_room(room_id)
|
|
|
|
current_state_ids = await self.state_handler.get_current_state_ids(
|
|
room_id, latest_event_ids=latest_event_ids
|
|
)
|
|
|
|
# TODO: Refactor into dictionary of explicitly allowed transitions
|
|
# between old and new state, with specific error messages for some
|
|
# transitions and generic otherwise
|
|
old_state_id = current_state_ids.get((EventTypes.Member, target.to_string()))
|
|
if old_state_id:
|
|
old_state = await self.store.get_event(old_state_id, allow_none=True)
|
|
old_membership = old_state.content.get("membership") if old_state else None
|
|
if action == "unban" and old_membership != "ban":
|
|
raise SynapseError(
|
|
403,
|
|
"Cannot unban user who was not banned"
|
|
" (membership=%s)" % old_membership,
|
|
errcode=Codes.BAD_STATE,
|
|
)
|
|
if old_membership == "ban" and action != "unban":
|
|
raise SynapseError(
|
|
403,
|
|
"Cannot %s user who was banned" % (action,),
|
|
errcode=Codes.BAD_STATE,
|
|
)
|
|
|
|
if old_state:
|
|
same_content = content == old_state.content
|
|
same_membership = old_membership == effective_membership_state
|
|
same_sender = requester.user.to_string() == old_state.sender
|
|
if same_sender and same_membership and same_content:
|
|
# duplicate event.
|
|
# we know it was persisted, so must have a stream ordering.
|
|
assert old_state.internal_metadata.stream_ordering
|
|
return (
|
|
old_state.event_id,
|
|
old_state.internal_metadata.stream_ordering,
|
|
)
|
|
|
|
if old_membership in ["ban", "leave"] and action == "kick":
|
|
raise AuthError(403, "The target user is not in the room")
|
|
|
|
# we don't allow people to reject invites to the server notice
|
|
# room, but they can leave it once they are joined.
|
|
if (
|
|
old_membership == Membership.INVITE
|
|
and effective_membership_state == Membership.LEAVE
|
|
):
|
|
is_blocked = await self._is_server_notice_room(room_id)
|
|
if is_blocked:
|
|
raise SynapseError(
|
|
HTTPStatus.FORBIDDEN,
|
|
"You cannot reject this invite",
|
|
errcode=Codes.CANNOT_LEAVE_SERVER_NOTICE_ROOM,
|
|
)
|
|
else:
|
|
if action == "kick":
|
|
raise AuthError(403, "The target user is not in the room")
|
|
|
|
is_host_in_room = await self._is_host_in_room(current_state_ids)
|
|
|
|
if effective_membership_state == Membership.JOIN:
|
|
if requester.is_guest:
|
|
guest_can_join = await self._can_guest_join(current_state_ids)
|
|
if not guest_can_join:
|
|
# This should be an auth check, but guests are a local concept,
|
|
# so don't really fit into the general auth process.
|
|
raise AuthError(403, "Guest access not allowed")
|
|
|
|
if not is_host_in_room:
|
|
if ratelimit:
|
|
time_now_s = self.clock.time()
|
|
(
|
|
allowed,
|
|
time_allowed,
|
|
) = await self._join_rate_limiter_remote.can_do_action(
|
|
requester,
|
|
)
|
|
|
|
if not allowed:
|
|
raise LimitExceededError(
|
|
retry_after_ms=int(1000 * (time_allowed - time_now_s))
|
|
)
|
|
|
|
inviter = await self._get_inviter(target.to_string(), room_id)
|
|
if inviter and not self.hs.is_mine(inviter):
|
|
remote_room_hosts.append(inviter.domain)
|
|
|
|
content["membership"] = Membership.JOIN
|
|
|
|
profile = self.profile_handler
|
|
if not content_specified:
|
|
content["displayname"] = await profile.get_displayname(target)
|
|
content["avatar_url"] = await profile.get_avatar_url(target)
|
|
|
|
if requester.is_guest:
|
|
content["kind"] = "guest"
|
|
|
|
remote_join_response = await self._remote_join(
|
|
requester, remote_room_hosts, room_id, target, content
|
|
)
|
|
|
|
return remote_join_response
|
|
|
|
elif effective_membership_state == Membership.LEAVE:
|
|
if not is_host_in_room:
|
|
# perhaps we've been invited
|
|
(
|
|
current_membership_type,
|
|
current_membership_event_id,
|
|
) = await self.store.get_local_current_membership_for_user_in_room(
|
|
target.to_string(), room_id
|
|
)
|
|
if (
|
|
current_membership_type != Membership.INVITE
|
|
or not current_membership_event_id
|
|
):
|
|
logger.info(
|
|
"%s sent a leave request to %s, but that is not an active room "
|
|
"on this server, and there is no pending invite",
|
|
target,
|
|
room_id,
|
|
)
|
|
|
|
raise SynapseError(404, "Not a known room")
|
|
|
|
invite = await self.store.get_event(current_membership_event_id)
|
|
logger.info(
|
|
"%s rejects invite to %s from %s", target, room_id, invite.sender
|
|
)
|
|
|
|
if not self.hs.is_mine_id(invite.sender):
|
|
# send the rejection to the inviter's HS (with fallback to
|
|
# local event)
|
|
return await self.remote_reject_invite(
|
|
invite.event_id,
|
|
txn_id,
|
|
requester,
|
|
content,
|
|
)
|
|
|
|
# the inviter was on our server, but has now left. Carry on
|
|
# with the normal rejection codepath, which will also send the
|
|
# rejection out to any other servers we believe are still in the room.
|
|
|
|
# thanks to overzealous cleaning up of event_forward_extremities in
|
|
# `delete_old_current_state_events`, it's possible to end up with no
|
|
# forward extremities here. If that happens, let's just hang the
|
|
# rejection off the invite event.
|
|
#
|
|
# see: https://github.com/matrix-org/synapse/issues/7139
|
|
if len(latest_event_ids) == 0:
|
|
latest_event_ids = [invite.event_id]
|
|
|
|
return await self._local_membership_update(
|
|
requester=requester,
|
|
target=target,
|
|
room_id=room_id,
|
|
membership=effective_membership_state,
|
|
txn_id=txn_id,
|
|
ratelimit=ratelimit,
|
|
prev_event_ids=latest_event_ids,
|
|
content=content,
|
|
require_consent=require_consent,
|
|
)
|
|
|
|
async def transfer_room_state_on_room_upgrade(
|
|
self, old_room_id: str, room_id: str
|
|
) -> None:
|
|
"""Upon our server becoming aware of an upgraded room, either by upgrading a room
|
|
ourselves or joining one, we can transfer over information from the previous room.
|
|
|
|
Copies user state (tags/push rules) for every local user that was in the old room, as
|
|
well as migrating the room directory state.
|
|
|
|
Args:
|
|
old_room_id: The ID of the old room
|
|
room_id: The ID of the new room
|
|
"""
|
|
logger.info("Transferring room state from %s to %s", old_room_id, room_id)
|
|
|
|
# Find all local users that were in the old room and copy over each user's state
|
|
users = await self.store.get_users_in_room(old_room_id)
|
|
await self.copy_user_state_on_room_upgrade(old_room_id, room_id, users)
|
|
|
|
# Add new room to the room directory if the old room was there
|
|
# Remove old room from the room directory
|
|
old_room = await self.store.get_room(old_room_id)
|
|
if old_room and old_room["is_public"]:
|
|
await self.store.set_room_is_public(old_room_id, False)
|
|
await self.store.set_room_is_public(room_id, True)
|
|
|
|
# Transfer alias mappings in the room directory
|
|
await self.store.update_aliases_for_room(old_room_id, room_id)
|
|
|
|
# Check if any groups we own contain the predecessor room
|
|
local_group_ids = await self.store.get_local_groups_for_room(old_room_id)
|
|
for group_id in local_group_ids:
|
|
# Add new the new room to those groups
|
|
await self.store.add_room_to_group(group_id, room_id, old_room["is_public"])
|
|
|
|
# Remove the old room from those groups
|
|
await self.store.remove_room_from_group(group_id, old_room_id)
|
|
|
|
async def copy_user_state_on_room_upgrade(
|
|
self, old_room_id: str, new_room_id: str, user_ids: Iterable[str]
|
|
) -> None:
|
|
"""Copy user-specific information when they join a new room when that new room is the
|
|
result of a room upgrade
|
|
|
|
Args:
|
|
old_room_id: The ID of upgraded room
|
|
new_room_id: The ID of the new room
|
|
user_ids: User IDs to copy state for
|
|
"""
|
|
|
|
logger.debug(
|
|
"Copying over room tags and push rules from %s to %s for users %s",
|
|
old_room_id,
|
|
new_room_id,
|
|
user_ids,
|
|
)
|
|
|
|
for user_id in user_ids:
|
|
try:
|
|
# It is an upgraded room. Copy over old tags
|
|
await self.copy_room_tags_and_direct_to_room(
|
|
old_room_id, new_room_id, user_id
|
|
)
|
|
# Copy over push rules
|
|
await self.store.copy_push_rules_from_room_to_room_for_user(
|
|
old_room_id, new_room_id, user_id
|
|
)
|
|
except Exception:
|
|
logger.exception(
|
|
"Error copying tags and/or push rules from rooms %s to %s for user %s. "
|
|
"Skipping...",
|
|
old_room_id,
|
|
new_room_id,
|
|
user_id,
|
|
)
|
|
continue
|
|
|
|
async def send_membership_event(
|
|
self,
|
|
requester: Optional[Requester],
|
|
event: EventBase,
|
|
context: EventContext,
|
|
ratelimit: bool = True,
|
|
):
|
|
"""
|
|
Change the membership status of a user in a room.
|
|
|
|
Args:
|
|
requester: The local user who requested the membership
|
|
event. If None, certain checks, like whether this homeserver can
|
|
act as the sender, will be skipped.
|
|
event: The membership event.
|
|
context: The context of the event.
|
|
ratelimit: Whether to rate limit this request.
|
|
Raises:
|
|
SynapseError if there was a problem changing the membership.
|
|
"""
|
|
target_user = UserID.from_string(event.state_key)
|
|
room_id = event.room_id
|
|
|
|
if requester is not None:
|
|
sender = UserID.from_string(event.sender)
|
|
assert (
|
|
sender == requester.user
|
|
), "Sender (%s) must be same as requester (%s)" % (sender, requester.user)
|
|
assert self.hs.is_mine(sender), "Sender must be our own: %s" % (sender,)
|
|
else:
|
|
requester = types.create_requester(target_user)
|
|
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
if event.membership == Membership.JOIN:
|
|
if requester.is_guest:
|
|
guest_can_join = await self._can_guest_join(prev_state_ids)
|
|
if not guest_can_join:
|
|
# This should be an auth check, but guests are a local concept,
|
|
# so don't really fit into the general auth process.
|
|
raise AuthError(403, "Guest access not allowed")
|
|
|
|
if event.membership not in (Membership.LEAVE, Membership.BAN):
|
|
is_blocked = await self.store.is_room_blocked(room_id)
|
|
if is_blocked:
|
|
raise SynapseError(403, "This room has been blocked on this server")
|
|
|
|
event = await self.event_creation_handler.handle_new_client_event(
|
|
requester, event, context, extra_users=[target_user], ratelimit=ratelimit
|
|
)
|
|
|
|
prev_member_event_id = prev_state_ids.get(
|
|
(EventTypes.Member, event.state_key), None
|
|
)
|
|
|
|
if event.membership == Membership.LEAVE:
|
|
if prev_member_event_id:
|
|
prev_member_event = await self.store.get_event(prev_member_event_id)
|
|
if prev_member_event.membership == Membership.JOIN:
|
|
await self._user_left_room(target_user, room_id)
|
|
|
|
async def _can_guest_join(self, current_state_ids: StateMap[str]) -> bool:
|
|
"""
|
|
Returns whether a guest can join a room based on its current state.
|
|
"""
|
|
guest_access_id = current_state_ids.get((EventTypes.GuestAccess, ""), None)
|
|
if not guest_access_id:
|
|
return False
|
|
|
|
guest_access = await self.store.get_event(guest_access_id)
|
|
|
|
return bool(
|
|
guest_access
|
|
and guest_access.content
|
|
and "guest_access" in guest_access.content
|
|
and guest_access.content["guest_access"] == "can_join"
|
|
)
|
|
|
|
async def lookup_room_alias(
|
|
self, room_alias: RoomAlias
|
|
) -> Tuple[RoomID, List[str]]:
|
|
"""
|
|
Get the room ID associated with a room alias.
|
|
|
|
Args:
|
|
room_alias: The alias to look up.
|
|
Returns:
|
|
A tuple of:
|
|
The room ID as a RoomID object.
|
|
Hosts likely to be participating in the room ([str]).
|
|
Raises:
|
|
SynapseError if room alias could not be found.
|
|
"""
|
|
directory_handler = self.directory_handler
|
|
mapping = await directory_handler.get_association(room_alias)
|
|
|
|
if not mapping:
|
|
raise SynapseError(404, "No such room alias")
|
|
|
|
room_id = mapping["room_id"]
|
|
servers = mapping["servers"]
|
|
|
|
# put the server which owns the alias at the front of the server list.
|
|
if room_alias.domain in servers:
|
|
servers.remove(room_alias.domain)
|
|
servers.insert(0, room_alias.domain)
|
|
|
|
return RoomID.from_string(room_id), servers
|
|
|
|
async def _get_inviter(self, user_id: str, room_id: str) -> Optional[UserID]:
|
|
invite = await self.store.get_invite_for_local_user_in_room(
|
|
user_id=user_id, room_id=room_id
|
|
)
|
|
if invite:
|
|
return UserID.from_string(invite.sender)
|
|
return None
|
|
|
|
async def do_3pid_invite(
|
|
self,
|
|
room_id: str,
|
|
inviter: UserID,
|
|
medium: str,
|
|
address: str,
|
|
id_server: str,
|
|
requester: Requester,
|
|
txn_id: Optional[str],
|
|
id_access_token: Optional[str] = None,
|
|
) -> int:
|
|
"""Invite a 3PID to a room.
|
|
|
|
Args:
|
|
room_id: The room to invite the 3PID to.
|
|
inviter: The user sending the invite.
|
|
medium: The 3PID's medium.
|
|
address: The 3PID's address.
|
|
id_server: The identity server to use.
|
|
requester: The user making the request.
|
|
txn_id: The transaction ID this is part of, or None if this is not
|
|
part of a transaction.
|
|
id_access_token: The optional identity server access token.
|
|
|
|
Returns:
|
|
The new stream ID.
|
|
|
|
Raises:
|
|
ShadowBanError if the requester has been shadow-banned.
|
|
"""
|
|
if self.config.block_non_admin_invites:
|
|
is_requester_admin = await self.auth.is_server_admin(requester.user)
|
|
if not is_requester_admin:
|
|
raise SynapseError(
|
|
403, "Invites have been disabled on this server", Codes.FORBIDDEN
|
|
)
|
|
|
|
if requester.shadow_banned:
|
|
# We randomly sleep a bit just to annoy the requester.
|
|
await self.clock.sleep(random.randint(1, 10))
|
|
raise ShadowBanError()
|
|
|
|
# We need to rate limit *before* we send out any 3PID invites, so we
|
|
# can't just rely on the standard ratelimiting of events.
|
|
await self.base_handler.ratelimit(requester)
|
|
|
|
can_invite = await self.third_party_event_rules.check_threepid_can_be_invited(
|
|
medium, address, room_id
|
|
)
|
|
if not can_invite:
|
|
raise SynapseError(
|
|
403,
|
|
"This third-party identifier can not be invited in this room",
|
|
Codes.FORBIDDEN,
|
|
)
|
|
|
|
if not self._enable_lookup:
|
|
raise SynapseError(
|
|
403, "Looking up third-party identifiers is denied from this server"
|
|
)
|
|
|
|
invitee = await self.identity_handler.lookup_3pid(
|
|
id_server, medium, address, id_access_token
|
|
)
|
|
|
|
if invitee:
|
|
# Note that update_membership with an action of "invite" can raise
|
|
# a ShadowBanError, but this was done above already.
|
|
_, stream_id = await self.update_membership(
|
|
requester, UserID.from_string(invitee), room_id, "invite", txn_id=txn_id
|
|
)
|
|
else:
|
|
stream_id = await self._make_and_store_3pid_invite(
|
|
requester,
|
|
id_server,
|
|
medium,
|
|
address,
|
|
room_id,
|
|
inviter,
|
|
txn_id=txn_id,
|
|
id_access_token=id_access_token,
|
|
)
|
|
|
|
return stream_id
|
|
|
|
async def _make_and_store_3pid_invite(
|
|
self,
|
|
requester: Requester,
|
|
id_server: str,
|
|
medium: str,
|
|
address: str,
|
|
room_id: str,
|
|
user: UserID,
|
|
txn_id: Optional[str],
|
|
id_access_token: Optional[str] = None,
|
|
) -> int:
|
|
room_state = await self.state_handler.get_current_state(room_id)
|
|
|
|
inviter_display_name = ""
|
|
inviter_avatar_url = ""
|
|
member_event = room_state.get((EventTypes.Member, user.to_string()))
|
|
if member_event:
|
|
inviter_display_name = member_event.content.get("displayname", "")
|
|
inviter_avatar_url = member_event.content.get("avatar_url", "")
|
|
|
|
# if user has no display name, default to their MXID
|
|
if not inviter_display_name:
|
|
inviter_display_name = user.to_string()
|
|
|
|
canonical_room_alias = ""
|
|
canonical_alias_event = room_state.get((EventTypes.CanonicalAlias, ""))
|
|
if canonical_alias_event:
|
|
canonical_room_alias = canonical_alias_event.content.get("alias", "")
|
|
|
|
room_name = ""
|
|
room_name_event = room_state.get((EventTypes.Name, ""))
|
|
if room_name_event:
|
|
room_name = room_name_event.content.get("name", "")
|
|
|
|
room_join_rules = ""
|
|
join_rules_event = room_state.get((EventTypes.JoinRules, ""))
|
|
if join_rules_event:
|
|
room_join_rules = join_rules_event.content.get("join_rule", "")
|
|
|
|
room_avatar_url = ""
|
|
room_avatar_event = room_state.get((EventTypes.RoomAvatar, ""))
|
|
if room_avatar_event:
|
|
room_avatar_url = room_avatar_event.content.get("url", "")
|
|
|
|
(
|
|
token,
|
|
public_keys,
|
|
fallback_public_key,
|
|
display_name,
|
|
) = await self.identity_handler.ask_id_server_for_third_party_invite(
|
|
requester=requester,
|
|
id_server=id_server,
|
|
medium=medium,
|
|
address=address,
|
|
room_id=room_id,
|
|
inviter_user_id=user.to_string(),
|
|
room_alias=canonical_room_alias,
|
|
room_avatar_url=room_avatar_url,
|
|
room_join_rules=room_join_rules,
|
|
room_name=room_name,
|
|
inviter_display_name=inviter_display_name,
|
|
inviter_avatar_url=inviter_avatar_url,
|
|
id_access_token=id_access_token,
|
|
)
|
|
|
|
(
|
|
event,
|
|
stream_id,
|
|
) = await self.event_creation_handler.create_and_send_nonmember_event(
|
|
requester,
|
|
{
|
|
"type": EventTypes.ThirdPartyInvite,
|
|
"content": {
|
|
"display_name": display_name,
|
|
"public_keys": public_keys,
|
|
# For backwards compatibility:
|
|
"key_validity_url": fallback_public_key["key_validity_url"],
|
|
"public_key": fallback_public_key["public_key"],
|
|
},
|
|
"room_id": room_id,
|
|
"sender": user.to_string(),
|
|
"state_key": token,
|
|
},
|
|
ratelimit=False,
|
|
txn_id=txn_id,
|
|
)
|
|
return stream_id
|
|
|
|
async def _is_host_in_room(self, current_state_ids: StateMap[str]) -> bool:
|
|
# Have we just created the room, and is this about to be the very
|
|
# first member event?
|
|
create_event_id = current_state_ids.get(("m.room.create", ""))
|
|
if len(current_state_ids) == 1 and create_event_id:
|
|
# We can only get here if we're in the process of creating the room
|
|
return True
|
|
|
|
for etype, state_key in current_state_ids:
|
|
if etype != EventTypes.Member or not self.hs.is_mine_id(state_key):
|
|
continue
|
|
|
|
event_id = current_state_ids[(etype, state_key)]
|
|
event = await self.store.get_event(event_id, allow_none=True)
|
|
if not event:
|
|
continue
|
|
|
|
if event.membership == Membership.JOIN:
|
|
return True
|
|
|
|
return False
|
|
|
|
async def _is_server_notice_room(self, room_id: str) -> bool:
|
|
if self._server_notices_mxid is None:
|
|
return False
|
|
user_ids = await self.store.get_users_in_room(room_id)
|
|
return self._server_notices_mxid in user_ids
|
|
|
|
|
|
class RoomMemberMasterHandler(RoomMemberHandler):
|
|
def __init__(self, hs: "HomeServer"):
|
|
super().__init__(hs)
|
|
|
|
self.distributor = hs.get_distributor()
|
|
self.distributor.declare("user_left_room")
|
|
self._server_name = hs.hostname
|
|
|
|
async def _is_remote_room_too_complex(
|
|
self, room_id: str, remote_room_hosts: List[str]
|
|
) -> Optional[bool]:
|
|
"""
|
|
Check if complexity of a remote room is too great.
|
|
|
|
Args:
|
|
room_id
|
|
remote_room_hosts
|
|
|
|
Returns: bool of whether the complexity is too great, or None
|
|
if unable to be fetched
|
|
"""
|
|
max_complexity = self.hs.config.limit_remote_rooms.complexity
|
|
complexity = await self.federation_handler.get_room_complexity(
|
|
remote_room_hosts, room_id
|
|
)
|
|
|
|
if complexity:
|
|
return complexity["v1"] > max_complexity
|
|
return None
|
|
|
|
async def _is_local_room_too_complex(self, room_id: str) -> bool:
|
|
"""
|
|
Check if the complexity of a local room is too great.
|
|
|
|
Args:
|
|
room_id: The room ID to check for complexity.
|
|
"""
|
|
max_complexity = self.hs.config.limit_remote_rooms.complexity
|
|
complexity = await self.store.get_room_complexity(room_id)
|
|
|
|
return complexity["v1"] > max_complexity
|
|
|
|
async def _remote_join(
|
|
self,
|
|
requester: Requester,
|
|
remote_room_hosts: List[str],
|
|
room_id: str,
|
|
user: UserID,
|
|
content: dict,
|
|
) -> Tuple[str, int]:
|
|
"""Implements RoomMemberHandler._remote_join"""
|
|
# filter ourselves out of remote_room_hosts: do_invite_join ignores it
|
|
# and if it is the only entry we'd like to return a 404 rather than a
|
|
# 500.
|
|
remote_room_hosts = [
|
|
host for host in remote_room_hosts if host != self.hs.hostname
|
|
]
|
|
|
|
if len(remote_room_hosts) == 0:
|
|
raise SynapseError(404, "No known servers")
|
|
|
|
check_complexity = self.hs.config.limit_remote_rooms.enabled
|
|
if check_complexity and self.hs.config.limit_remote_rooms.admins_can_join:
|
|
check_complexity = not await self.auth.is_server_admin(user)
|
|
|
|
if check_complexity:
|
|
# Fetch the room complexity
|
|
too_complex = await self._is_remote_room_too_complex(
|
|
room_id, remote_room_hosts
|
|
)
|
|
if too_complex is True:
|
|
raise SynapseError(
|
|
code=400,
|
|
msg=self.hs.config.limit_remote_rooms.complexity_error,
|
|
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
|
|
)
|
|
|
|
# We don't do an auth check if we are doing an invite
|
|
# join dance for now, since we're kinda implicitly checking
|
|
# that we are allowed to join when we decide whether or not we
|
|
# need to do the invite/join dance.
|
|
event_id, stream_id = await self.federation_handler.do_invite_join(
|
|
remote_room_hosts, room_id, user.to_string(), content
|
|
)
|
|
|
|
# Check the room we just joined wasn't too large, if we didn't fetch the
|
|
# complexity of it before.
|
|
if check_complexity:
|
|
if too_complex is False:
|
|
# We checked, and we're under the limit.
|
|
return event_id, stream_id
|
|
|
|
# Check again, but with the local state events
|
|
too_complex = await self._is_local_room_too_complex(room_id)
|
|
|
|
if too_complex is False:
|
|
# We're under the limit.
|
|
return event_id, stream_id
|
|
|
|
# The room is too large. Leave.
|
|
requester = types.create_requester(
|
|
user, authenticated_entity=self._server_name
|
|
)
|
|
await self.update_membership(
|
|
requester=requester, target=user, room_id=room_id, action="leave"
|
|
)
|
|
raise SynapseError(
|
|
code=400,
|
|
msg=self.hs.config.limit_remote_rooms.complexity_error,
|
|
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
|
|
)
|
|
|
|
return event_id, stream_id
|
|
|
|
async def remote_reject_invite(
|
|
self,
|
|
invite_event_id: str,
|
|
txn_id: Optional[str],
|
|
requester: Requester,
|
|
content: JsonDict,
|
|
) -> Tuple[str, int]:
|
|
"""
|
|
Rejects an out-of-band invite received from a remote user
|
|
|
|
Implements RoomMemberHandler.remote_reject_invite
|
|
"""
|
|
invite_event = await self.store.get_event(invite_event_id)
|
|
room_id = invite_event.room_id
|
|
target_user = invite_event.state_key
|
|
|
|
# first of all, try doing a rejection via the inviting server
|
|
fed_handler = self.federation_handler
|
|
try:
|
|
inviter_id = UserID.from_string(invite_event.sender)
|
|
event, stream_id = await fed_handler.do_remotely_reject_invite(
|
|
[inviter_id.domain], room_id, target_user, content=content
|
|
)
|
|
return event.event_id, stream_id
|
|
except Exception as e:
|
|
# if we were unable to reject the invite, we will generate our own
|
|
# leave event.
|
|
#
|
|
# The 'except' clause is very broad, but we need to
|
|
# capture everything from DNS failures upwards
|
|
#
|
|
logger.warning("Failed to reject invite: %s", e)
|
|
|
|
return await self._generate_local_out_of_band_leave(
|
|
invite_event, txn_id, requester, content
|
|
)
|
|
|
|
async def _generate_local_out_of_band_leave(
|
|
self,
|
|
previous_membership_event: EventBase,
|
|
txn_id: Optional[str],
|
|
requester: Requester,
|
|
content: JsonDict,
|
|
) -> Tuple[str, int]:
|
|
"""Generate a local leave event for a room
|
|
|
|
This can be called after we e.g fail to reject an invite via a remote server.
|
|
It generates an out-of-band membership event locally.
|
|
|
|
Args:
|
|
previous_membership_event: the previous membership event for this user
|
|
txn_id: optional transaction ID supplied by the client
|
|
requester: user making the request, according to the access token
|
|
content: additional content to include in the leave event.
|
|
Normally an empty dict.
|
|
|
|
Returns:
|
|
A tuple containing (event_id, stream_id of the leave event)
|
|
"""
|
|
room_id = previous_membership_event.room_id
|
|
target_user = previous_membership_event.state_key
|
|
|
|
content["membership"] = Membership.LEAVE
|
|
|
|
event_dict = {
|
|
"type": EventTypes.Member,
|
|
"room_id": room_id,
|
|
"sender": target_user,
|
|
"content": content,
|
|
"state_key": target_user,
|
|
}
|
|
|
|
# the auth events for the new event are the same as that of the previous event, plus
|
|
# the event itself.
|
|
#
|
|
# the prev_events consist solely of the previous membership event.
|
|
prev_event_ids = [previous_membership_event.event_id]
|
|
auth_event_ids = previous_membership_event.auth_event_ids() + prev_event_ids
|
|
|
|
event, context = await self.event_creation_handler.create_event(
|
|
requester,
|
|
event_dict,
|
|
txn_id=txn_id,
|
|
prev_event_ids=prev_event_ids,
|
|
auth_event_ids=auth_event_ids,
|
|
)
|
|
event.internal_metadata.outlier = True
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
result_event = await self.event_creation_handler.handle_new_client_event(
|
|
requester,
|
|
event,
|
|
context,
|
|
extra_users=[UserID.from_string(target_user)],
|
|
)
|
|
# we know it was persisted, so must have a stream ordering
|
|
assert result_event.internal_metadata.stream_ordering
|
|
|
|
return result_event.event_id, result_event.internal_metadata.stream_ordering
|
|
|
|
async def _user_left_room(self, target: UserID, room_id: str) -> None:
|
|
"""Implements RoomMemberHandler._user_left_room"""
|
|
user_left_room(self.distributor, target, room_id)
|
|
|
|
async def forget(self, user: UserID, room_id: str) -> None:
|
|
user_id = user.to_string()
|
|
|
|
member = await self.state_handler.get_current_state(
|
|
room_id=room_id, event_type=EventTypes.Member, state_key=user_id
|
|
)
|
|
membership = member.membership if member else None
|
|
|
|
if membership is not None and membership not in [
|
|
Membership.LEAVE,
|
|
Membership.BAN,
|
|
]:
|
|
raise SynapseError(400, "User %s in room %s" % (user_id, room_id))
|
|
|
|
if membership:
|
|
await self.store.forget(user_id, room_id)
|