787 lines
29 KiB
Python
787 lines
29 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2016 OpenMarket Ltd
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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 logging
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from signedjson.key import decode_verify_key_bytes
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from signedjson.sign import verify_signed_json
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from twisted.internet import defer
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from unpaddedbase64 import decode_base64
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import synapse.types
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from synapse.api.constants import (
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EventTypes, Membership,
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)
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from synapse.api.errors import AuthError, SynapseError, Codes
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from synapse.types import UserID, RoomID
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from synapse.util.async import Linearizer
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from synapse.util.distributor import user_left_room, user_joined_room
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from ._base import BaseHandler
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logger = logging.getLogger(__name__)
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id_server_scheme = "https://"
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class RoomMemberHandler(BaseHandler):
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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):
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super(RoomMemberHandler, self).__init__(hs)
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self.member_linearizer = Linearizer(name="member")
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self.clock = hs.get_clock()
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self.distributor = hs.get_distributor()
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self.distributor.declare("user_joined_room")
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self.distributor.declare("user_left_room")
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@defer.inlineCallbacks
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def _local_membership_update(
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self, requester, target, room_id, membership,
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prev_event_ids,
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txn_id=None,
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ratelimit=True,
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content=None,
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):
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if content is None:
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content = {}
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msg_handler = self.hs.get_handlers().message_handler
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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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event, context = yield msg_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": target.to_string(),
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# For backwards compatibility:
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"membership": membership,
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},
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token_id=requester.access_token_id,
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txn_id=txn_id,
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prev_event_ids=prev_event_ids,
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)
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# Check if this event matches the previous membership event for the user.
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duplicate = yield msg_handler.deduplicate_state_event(event, context)
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if duplicate is not None:
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# Discard the new event since this membership change is a no-op.
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defer.returnValue(duplicate)
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yield msg_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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prev_member_event_id = context.prev_state_ids.get(
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(EventTypes.Member, target.to_string()),
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None
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)
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if event.membership == Membership.JOIN:
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# Only fire user_joined_room if the user has acutally joined the
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# room. Don't bother if the user is just changing their profile
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# info.
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newly_joined = True
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if prev_member_event_id:
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prev_member_event = yield self.store.get_event(prev_member_event_id)
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newly_joined = prev_member_event.membership != Membership.JOIN
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if newly_joined:
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yield user_joined_room(self.distributor, target, room_id)
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elif event.membership == Membership.LEAVE:
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if prev_member_event_id:
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prev_member_event = yield self.store.get_event(prev_member_event_id)
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if prev_member_event.membership == Membership.JOIN:
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user_left_room(self.distributor, target, room_id)
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defer.returnValue(event)
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@defer.inlineCallbacks
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def remote_join(self, remote_room_hosts, room_id, user, content):
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if len(remote_room_hosts) == 0:
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raise SynapseError(404, "No known servers")
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# We don't do an auth check if we are doing an invite
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# join dance for now, since we're kinda implicitly checking
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# that we are allowed to join when we decide whether or not we
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# need to do the invite/join dance.
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yield self.hs.get_handlers().federation_handler.do_invite_join(
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remote_room_hosts,
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room_id,
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user.to_string(),
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content,
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)
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yield user_joined_room(self.distributor, user, room_id)
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@defer.inlineCallbacks
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def update_membership(
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self,
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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=None,
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remote_room_hosts=None,
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third_party_signed=None,
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ratelimit=True,
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content=None,
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):
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key = (room_id,)
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with (yield self.member_linearizer.queue(key)):
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result = yield self._update_membership(
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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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)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _update_membership(
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self,
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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=None,
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remote_room_hosts=None,
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third_party_signed=None,
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ratelimit=True,
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content=None,
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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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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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replication = self.hs.get_replication_layer()
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yield replication.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 = yield 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 == "invite" and
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self.hs.config.block_non_admin_invites):
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is_requester_admin = yield self.auth.is_server_admin(
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requester.user,
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)
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if not is_requester_admin:
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raise SynapseError(
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403, "Invites have been disabled on this server",
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)
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latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
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current_state_ids = yield self.state_handler.get_current_state_ids(
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room_id, latest_event_ids=latest_event_ids,
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)
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old_state_id = current_state_ids.get((EventTypes.Member, target.to_string()))
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if old_state_id:
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old_state = yield self.store.get_event(old_state_id, allow_none=True)
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old_membership = old_state.content.get("membership") if old_state else None
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if action == "unban" and old_membership != "ban":
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raise SynapseError(
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403,
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"Cannot unban user who was not banned"
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" (membership=%s)" % old_membership,
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errcode=Codes.BAD_STATE
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)
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if old_membership == "ban" and action != "unban":
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raise SynapseError(
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403,
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"Cannot %s user who was banned" % (action,),
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errcode=Codes.BAD_STATE
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)
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if old_state:
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same_content = content == old_state.content
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same_membership = old_membership == effective_membership_state
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same_sender = requester.user.to_string() == old_state.sender
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if same_sender and same_membership and same_content:
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defer.returnValue(old_state)
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is_host_in_room = yield self._is_host_in_room(current_state_ids)
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if effective_membership_state == Membership.JOIN:
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if requester.is_guest:
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guest_can_join = yield self._can_guest_join(current_state_ids)
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if not guest_can_join:
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# This should be an auth check, but guests are a local concept,
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# so don't really fit into the general auth process.
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raise AuthError(403, "Guest access not allowed")
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if not is_host_in_room:
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inviter = yield self.get_inviter(target.to_string(), room_id)
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if inviter and not self.hs.is_mine(inviter):
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remote_room_hosts.append(inviter.domain)
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content["membership"] = Membership.JOIN
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profile = self.hs.get_handlers().profile_handler
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if not content_specified:
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content["displayname"] = yield profile.get_displayname(target)
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content["avatar_url"] = yield profile.get_avatar_url(target)
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if requester.is_guest:
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content["kind"] = "guest"
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ret = yield self.remote_join(
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remote_room_hosts, room_id, target, content
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)
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defer.returnValue(ret)
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elif effective_membership_state == Membership.LEAVE:
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if not is_host_in_room:
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# perhaps we've been invited
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inviter = yield self.get_inviter(target.to_string(), room_id)
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if not inviter:
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raise SynapseError(404, "Not a known room")
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if self.hs.is_mine(inviter):
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# the inviter was on our server, but has now left. Carry on
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# with the normal rejection codepath.
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#
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# This is a bit of a hack, because the room might still be
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# active on other servers.
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pass
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else:
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# send the rejection to the inviter's HS.
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remote_room_hosts = remote_room_hosts + [inviter.domain]
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fed_handler = self.hs.get_handlers().federation_handler
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try:
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ret = yield fed_handler.do_remotely_reject_invite(
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remote_room_hosts,
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room_id,
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target.to_string(),
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)
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defer.returnValue(ret)
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except Exception as e:
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# if we were unable to reject the exception, just mark
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# it as rejected on our end and plough ahead.
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#
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# The 'except' clause is very broad, but we need to
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# capture everything from DNS failures upwards
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#
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logger.warn("Failed to reject invite: %s", e)
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yield self.store.locally_reject_invite(
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target.to_string(), room_id
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)
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defer.returnValue({})
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res = yield self._local_membership_update(
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requester=requester,
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target=target,
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room_id=room_id,
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membership=effective_membership_state,
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txn_id=txn_id,
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ratelimit=ratelimit,
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prev_event_ids=latest_event_ids,
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content=content,
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)
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defer.returnValue(res)
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@defer.inlineCallbacks
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def send_membership_event(
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self,
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requester,
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event,
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context,
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remote_room_hosts=None,
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ratelimit=True,
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):
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"""
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Change the membership status of a user in a room.
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Args:
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requester (Requester): The local user who requested the membership
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event. If None, certain checks, like whether this homeserver can
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act as the sender, will be skipped.
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event (SynapseEvent): The membership event.
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context: The context of the event.
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is_guest (bool): Whether the sender is a guest.
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room_hosts ([str]): Homeservers which are likely to already be in
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the room, and could be danced with in order to join this
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homeserver for the first time.
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ratelimit (bool): Whether to rate limit this request.
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Raises:
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SynapseError if there was a problem changing the membership.
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"""
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remote_room_hosts = remote_room_hosts or []
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target_user = UserID.from_string(event.state_key)
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room_id = event.room_id
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if requester is not None:
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sender = UserID.from_string(event.sender)
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assert sender == requester.user, (
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"Sender (%s) must be same as requester (%s)" %
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(sender, requester.user)
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)
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assert self.hs.is_mine(sender), "Sender must be our own: %s" % (sender,)
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else:
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requester = synapse.types.create_requester(target_user)
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message_handler = self.hs.get_handlers().message_handler
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prev_event = yield message_handler.deduplicate_state_event(event, context)
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if prev_event is not None:
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return
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if event.membership == Membership.JOIN:
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if requester.is_guest:
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guest_can_join = yield self._can_guest_join(context.prev_state_ids)
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if not guest_can_join:
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# This should be an auth check, but guests are a local concept,
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# so don't really fit into the general auth process.
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raise AuthError(403, "Guest access not allowed")
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if event.membership not in (Membership.LEAVE, Membership.BAN):
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is_blocked = yield 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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yield message_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_user],
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ratelimit=ratelimit,
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)
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prev_member_event_id = context.prev_state_ids.get(
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(EventTypes.Member, event.state_key),
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None
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)
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if event.membership == Membership.JOIN:
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# Only fire user_joined_room if the user has acutally joined the
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# room. Don't bother if the user is just changing their profile
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# info.
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newly_joined = True
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if prev_member_event_id:
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prev_member_event = yield self.store.get_event(prev_member_event_id)
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newly_joined = prev_member_event.membership != Membership.JOIN
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if newly_joined:
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yield user_joined_room(self.distributor, target_user, room_id)
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elif event.membership == Membership.LEAVE:
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if prev_member_event_id:
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prev_member_event = yield self.store.get_event(prev_member_event_id)
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if prev_member_event.membership == Membership.JOIN:
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user_left_room(self.distributor, target_user, room_id)
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@defer.inlineCallbacks
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def _can_guest_join(self, current_state_ids):
|
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"""
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Returns whether a guest can join a room based on its current state.
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"""
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guest_access_id = current_state_ids.get((EventTypes.GuestAccess, ""), None)
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if not guest_access_id:
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defer.returnValue(False)
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guest_access = yield self.store.get_event(guest_access_id)
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defer.returnValue(
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guest_access
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and guest_access.content
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and "guest_access" in guest_access.content
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and guest_access.content["guest_access"] == "can_join"
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)
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@defer.inlineCallbacks
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|
def lookup_room_alias(self, room_alias):
|
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"""
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Get the room ID associated with a room alias.
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|
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Args:
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room_alias (RoomAlias): The alias to look up.
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Returns:
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A tuple of:
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The room ID as a RoomID object.
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Hosts likely to be participating in the room ([str]).
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|
Raises:
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SynapseError if room alias could not be found.
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"""
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directory_handler = self.hs.get_handlers().directory_handler
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mapping = yield directory_handler.get_association(room_alias)
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if not mapping:
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raise SynapseError(404, "No such room alias")
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room_id = mapping["room_id"]
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servers = mapping["servers"]
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defer.returnValue((RoomID.from_string(room_id), servers))
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|
|
|
@defer.inlineCallbacks
|
|
def get_inviter(self, user_id, room_id):
|
|
invite = yield self.store.get_invite_for_user_in_room(
|
|
user_id=user_id,
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room_id=room_id,
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)
|
|
if invite:
|
|
defer.returnValue(UserID.from_string(invite.sender))
|
|
|
|
@defer.inlineCallbacks
|
|
def do_3pid_invite(
|
|
self,
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room_id,
|
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inviter,
|
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medium,
|
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address,
|
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id_server,
|
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requester,
|
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txn_id
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):
|
|
if self.hs.config.block_non_admin_invites:
|
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is_requester_admin = yield self.auth.is_server_admin(
|
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requester.user,
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)
|
|
if not is_requester_admin:
|
|
raise SynapseError(
|
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403, "Invites have been disabled on this server",
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Codes.FORBIDDEN,
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|
)
|
|
|
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invitee = yield self._lookup_3pid(
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id_server, medium, address
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)
|
|
|
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if invitee:
|
|
yield self.update_membership(
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requester,
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UserID.from_string(invitee),
|
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room_id,
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"invite",
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txn_id=txn_id,
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)
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else:
|
|
yield self._make_and_store_3pid_invite(
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requester,
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id_server,
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medium,
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address,
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room_id,
|
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inviter,
|
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txn_id=txn_id
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)
|
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|
|
@defer.inlineCallbacks
|
|
def _lookup_3pid(self, id_server, medium, address):
|
|
"""Looks up a 3pid in the passed identity server.
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Args:
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id_server (str): The server name (including port, if required)
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of the identity server to use.
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medium (str): The type of the third party identifier (e.g. "email").
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address (str): The third party identifier (e.g. "foo@example.com").
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Returns:
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str: the matrix ID of the 3pid, or None if it is not recognized.
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"""
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try:
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data = yield self.hs.get_simple_http_client().get_json(
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"%s%s/_matrix/identity/api/v1/lookup" % (id_server_scheme, id_server,),
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{
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"medium": medium,
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"address": address,
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}
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)
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if "mxid" in data:
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if "signatures" not in data:
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raise AuthError(401, "No signatures on 3pid binding")
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self.verify_any_signature(data, id_server)
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defer.returnValue(data["mxid"])
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except IOError as e:
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logger.warn("Error from identity server lookup: %s" % (e,))
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defer.returnValue(None)
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@defer.inlineCallbacks
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def verify_any_signature(self, data, server_hostname):
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if server_hostname not in data["signatures"]:
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raise AuthError(401, "No signature from server %s" % (server_hostname,))
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for key_name, signature in data["signatures"][server_hostname].items():
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key_data = yield self.hs.get_simple_http_client().get_json(
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"%s%s/_matrix/identity/api/v1/pubkey/%s" %
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(id_server_scheme, server_hostname, key_name,),
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)
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if "public_key" not in key_data:
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raise AuthError(401, "No public key named %s from %s" %
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(key_name, server_hostname,))
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verify_signed_json(
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data,
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server_hostname,
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decode_verify_key_bytes(key_name, decode_base64(key_data["public_key"]))
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)
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return
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@defer.inlineCallbacks
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def _make_and_store_3pid_invite(
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self,
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requester,
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id_server,
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medium,
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address,
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room_id,
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user,
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txn_id
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):
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room_state = yield self.hs.get_state_handler().get_current_state(room_id)
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inviter_display_name = ""
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inviter_avatar_url = ""
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member_event = room_state.get((EventTypes.Member, user.to_string()))
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if member_event:
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inviter_display_name = member_event.content.get("displayname", "")
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inviter_avatar_url = member_event.content.get("avatar_url", "")
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canonical_room_alias = ""
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canonical_alias_event = room_state.get((EventTypes.CanonicalAlias, ""))
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if canonical_alias_event:
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canonical_room_alias = canonical_alias_event.content.get("alias", "")
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room_name = ""
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room_name_event = room_state.get((EventTypes.Name, ""))
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if room_name_event:
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room_name = room_name_event.content.get("name", "")
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room_join_rules = ""
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join_rules_event = room_state.get((EventTypes.JoinRules, ""))
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if join_rules_event:
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room_join_rules = join_rules_event.content.get("join_rule", "")
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room_avatar_url = ""
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room_avatar_event = room_state.get((EventTypes.RoomAvatar, ""))
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if room_avatar_event:
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room_avatar_url = room_avatar_event.content.get("url", "")
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token, public_keys, fallback_public_key, display_name = (
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yield self._ask_id_server_for_third_party_invite(
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id_server=id_server,
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medium=medium,
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address=address,
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room_id=room_id,
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inviter_user_id=user.to_string(),
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room_alias=canonical_room_alias,
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room_avatar_url=room_avatar_url,
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room_join_rules=room_join_rules,
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room_name=room_name,
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inviter_display_name=inviter_display_name,
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inviter_avatar_url=inviter_avatar_url
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)
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)
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msg_handler = self.hs.get_handlers().message_handler
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yield msg_handler.create_and_send_nonmember_event(
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requester,
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{
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"type": EventTypes.ThirdPartyInvite,
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"content": {
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"display_name": display_name,
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"public_keys": public_keys,
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# For backwards compatibility:
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"key_validity_url": fallback_public_key["key_validity_url"],
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"public_key": fallback_public_key["public_key"],
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},
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"room_id": room_id,
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"sender": user.to_string(),
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"state_key": token,
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},
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txn_id=txn_id,
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)
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@defer.inlineCallbacks
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def _ask_id_server_for_third_party_invite(
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self,
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id_server,
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medium,
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address,
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room_id,
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inviter_user_id,
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room_alias,
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room_avatar_url,
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room_join_rules,
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room_name,
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inviter_display_name,
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inviter_avatar_url
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):
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"""
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Asks an identity server for a third party invite.
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Args:
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id_server (str): hostname + optional port for the identity server.
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medium (str): The literal string "email".
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address (str): The third party address being invited.
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room_id (str): The ID of the room to which the user is invited.
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inviter_user_id (str): The user ID of the inviter.
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room_alias (str): An alias for the room, for cosmetic notifications.
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room_avatar_url (str): The URL of the room's avatar, for cosmetic
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notifications.
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room_join_rules (str): The join rules of the email (e.g. "public").
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room_name (str): The m.room.name of the room.
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inviter_display_name (str): The current display name of the
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inviter.
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inviter_avatar_url (str): The URL of the inviter's avatar.
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Returns:
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A deferred tuple containing:
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token (str): The token which must be signed to prove authenticity.
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public_keys ([{"public_key": str, "key_validity_url": str}]):
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public_key is a base64-encoded ed25519 public key.
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fallback_public_key: One element from public_keys.
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display_name (str): A user-friendly name to represent the invited
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user.
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"""
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is_url = "%s%s/_matrix/identity/api/v1/store-invite" % (
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id_server_scheme, id_server,
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)
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invite_config = {
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"medium": medium,
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"address": address,
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"room_id": room_id,
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"room_alias": room_alias,
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"room_avatar_url": room_avatar_url,
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"room_join_rules": room_join_rules,
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"room_name": room_name,
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"sender": inviter_user_id,
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"sender_display_name": inviter_display_name,
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"sender_avatar_url": inviter_avatar_url,
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}
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if self.hs.config.invite_3pid_guest:
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registration_handler = self.hs.get_handlers().registration_handler
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guest_access_token = yield registration_handler.guest_access_token_for(
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medium=medium,
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address=address,
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inviter_user_id=inviter_user_id,
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)
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guest_user_info = yield self.hs.get_auth().get_user_by_access_token(
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guest_access_token
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)
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invite_config.update({
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"guest_access_token": guest_access_token,
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"guest_user_id": guest_user_info["user"].to_string(),
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})
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data = yield self.hs.get_simple_http_client().post_urlencoded_get_json(
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is_url,
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invite_config
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)
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# TODO: Check for success
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token = data["token"]
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public_keys = data.get("public_keys", [])
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if "public_key" in data:
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fallback_public_key = {
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"public_key": data["public_key"],
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"key_validity_url": "%s%s/_matrix/identity/api/v1/pubkey/isvalid" % (
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id_server_scheme, id_server,
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),
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}
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else:
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fallback_public_key = public_keys[0]
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if not public_keys:
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public_keys.append(fallback_public_key)
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display_name = data["display_name"]
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defer.returnValue((token, public_keys, fallback_public_key, display_name))
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@defer.inlineCallbacks
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def forget(self, user, room_id):
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user_id = user.to_string()
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member = yield self.state_handler.get_current_state(
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room_id=room_id,
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event_type=EventTypes.Member,
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state_key=user_id
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)
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membership = member.membership if member else None
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if membership is not None and membership not in [
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Membership.LEAVE, Membership.BAN
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]:
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raise SynapseError(400, "User %s in room %s" % (
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user_id, room_id
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))
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if membership:
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yield self.store.forget(user_id, room_id)
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@defer.inlineCallbacks
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def _is_host_in_room(self, current_state_ids):
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# Have we just created the room, and is this about to be the very
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# first member event?
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create_event_id = current_state_ids.get(("m.room.create", ""))
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if len(current_state_ids) == 1 and create_event_id:
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defer.returnValue(self.hs.is_mine_id(create_event_id))
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for etype, state_key in current_state_ids:
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if etype != EventTypes.Member or not self.hs.is_mine_id(state_key):
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continue
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event_id = current_state_ids[(etype, state_key)]
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event = yield self.store.get_event(event_id, allow_none=True)
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if not event:
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continue
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if event.membership == Membership.JOIN:
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defer.returnValue(True)
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defer.returnValue(False)
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