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https://mau.dev/maunium/synapse.git
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![Kegan Dougal](/assets/img/avatar_default.png)
The simple fix doesn't work here because room creation also involves unknown room IDs. The check relies on the presence of m.room.create for rooms being created, whereas bogus room IDs have no state events at all.
583 lines
20 KiB
Python
583 lines
20 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 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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"""This module contains classes for authenticating the user."""
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from twisted.internet import defer
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from synapse.api.constants import EventTypes, Membership, JoinRules
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from synapse.api.errors import AuthError, StoreError, Codes, SynapseError
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from synapse.util.logutils import log_function
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from synapse.util.async import run_on_reactor
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import logging
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logger = logging.getLogger(__name__)
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class Auth(object):
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def __init__(self, hs):
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self.hs = hs
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self.store = hs.get_datastore()
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self.state = hs.get_state_handler()
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def check(self, event, auth_events):
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""" Checks if this event is correctly authed.
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Returns:
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True if the auth checks pass.
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"""
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try:
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if not hasattr(event, "room_id"):
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raise AuthError(500, "Event has no room_id: %s" % event)
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if auth_events is None:
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# Oh, we don't know what the state of the room was, so we
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# are trusting that this is allowed (at least for now)
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logger.warn("Trusting event: %s", event.event_id)
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return True
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if event.type == EventTypes.Create:
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# FIXME
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return True
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# FIXME: Temp hack
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if event.type == EventTypes.Aliases:
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return True
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logger.debug("Auth events: %s", auth_events)
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if event.type == EventTypes.Member:
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allowed = self.is_membership_change_allowed(
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event, auth_events
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)
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if allowed:
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logger.debug("Allowing! %s", event)
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else:
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logger.debug("Denying! %s", event)
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return allowed
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self.check_event_sender_in_room(event, auth_events)
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self._can_send_event(event, auth_events)
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if event.type == EventTypes.PowerLevels:
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self._check_power_levels(event, auth_events)
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if event.type == EventTypes.Redaction:
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self._check_redaction(event, auth_events)
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logger.debug("Allowing! %s", event)
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except AuthError as e:
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logger.info(
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"Event auth check failed on event %s with msg: %s",
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event, e.msg
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)
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logger.info("Denying! %s", event)
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raise
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@defer.inlineCallbacks
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def check_joined_room(self, room_id, user_id):
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member = yield self.state.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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self._check_joined_room(member, user_id, room_id)
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defer.returnValue(member)
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@defer.inlineCallbacks
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def check_host_in_room(self, room_id, host, context=None):
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if context:
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# XXX: check_host_in_room should really return True for a new
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# room created by this home server. There are no m.room.member
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# join events yet so we need to check for the m.room.create event
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# instead.
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if (u"m.room.create", u"") in context.auth_events:
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defer.returnValue(True)
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return
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curr_state = yield self.state.get_current_state(room_id)
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for event in curr_state:
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if event.type == EventTypes.Member:
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try:
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if self.hs.parse_userid(event.state_key).domain != host:
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continue
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except:
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logger.warn("state_key not user_id: %s", event.state_key)
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continue
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if event.content["membership"] == Membership.JOIN:
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defer.returnValue(True)
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defer.returnValue(False)
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def check_event_sender_in_room(self, event, auth_events):
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key = (EventTypes.Member, event.user_id, )
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member_event = auth_events.get(key)
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return self._check_joined_room(
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member_event,
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event.user_id,
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event.room_id
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)
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def _check_joined_room(self, member, user_id, room_id):
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if not member or member.membership != Membership.JOIN:
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raise AuthError(403, "User %s not in room %s (%s)" % (
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user_id, room_id, repr(member)
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))
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@log_function
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def is_membership_change_allowed(self, event, auth_events):
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membership = event.content["membership"]
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# Check if this is the room creator joining:
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if len(event.prev_events) == 1 and Membership.JOIN == membership:
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# Get room creation event:
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key = (EventTypes.Create, "", )
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create = auth_events.get(key)
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if create and event.prev_events[0][0] == create.event_id:
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if create.content["creator"] == event.state_key:
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return True
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target_user_id = event.state_key
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# get info about the caller
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key = (EventTypes.Member, event.user_id, )
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caller = auth_events.get(key)
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caller_in_room = caller and caller.membership == Membership.JOIN
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caller_invited = caller and caller.membership == Membership.INVITE
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# get info about the target
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key = (EventTypes.Member, target_user_id, )
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target = auth_events.get(key)
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target_in_room = target and target.membership == Membership.JOIN
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key = (EventTypes.JoinRules, "", )
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join_rule_event = auth_events.get(key)
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if join_rule_event:
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join_rule = join_rule_event.content.get(
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"join_rule", JoinRules.INVITE
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)
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else:
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join_rule = JoinRules.INVITE
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user_level = self._get_power_level_from_event_state(
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event,
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event.user_id,
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auth_events,
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)
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ban_level, kick_level, redact_level = (
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self._get_ops_level_from_event_state(
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event,
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auth_events,
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)
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)
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logger.debug(
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"is_membership_change_allowed: %s",
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{
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"caller_in_room": caller_in_room,
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"caller_invited": caller_invited,
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"target_in_room": target_in_room,
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"membership": membership,
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"join_rule": join_rule,
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"target_user_id": target_user_id,
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"event.user_id": event.user_id,
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}
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)
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if Membership.INVITE == membership:
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# TODO (erikj): We should probably handle this more intelligently
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# PRIVATE join rules.
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# Invites are valid iff caller is in the room and target isn't.
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if not caller_in_room: # caller isn't joined
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raise AuthError(
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403,
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"%s not in room %s." % (event.user_id, event.room_id,)
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)
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elif target_in_room: # the target is already in the room.
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raise AuthError(403, "%s is already in the room." %
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target_user_id)
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elif Membership.JOIN == membership:
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# Joins are valid iff caller == target and they were:
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# invited: They are accepting the invitation
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# joined: It's a NOOP
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if event.user_id != target_user_id:
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raise AuthError(403, "Cannot force another user to join.")
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elif join_rule == JoinRules.PUBLIC:
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pass
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elif join_rule == JoinRules.INVITE:
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if not caller_in_room and not caller_invited:
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raise AuthError(403, "You are not invited to this room.")
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else:
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# TODO (erikj): may_join list
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# TODO (erikj): private rooms
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raise AuthError(403, "You are not allowed to join this room")
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elif Membership.LEAVE == membership:
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# TODO (erikj): Implement kicks.
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if not caller_in_room: # trying to leave a room you aren't joined
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raise AuthError(
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403,
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"%s not in room %s." % (target_user_id, event.room_id,)
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)
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elif target_user_id != event.user_id:
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if kick_level:
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kick_level = int(kick_level)
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else:
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kick_level = 50 # FIXME (erikj): What should we do here?
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if user_level < kick_level:
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raise AuthError(
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403, "You cannot kick user %s." % target_user_id
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)
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elif Membership.BAN == membership:
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if ban_level:
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ban_level = int(ban_level)
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else:
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ban_level = 50 # FIXME (erikj): What should we do here?
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if user_level < ban_level:
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raise AuthError(403, "You don't have permission to ban")
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else:
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raise AuthError(500, "Unknown membership %s" % membership)
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return True
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def _get_power_level_from_event_state(self, event, user_id, auth_events):
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key = (EventTypes.PowerLevels, "", )
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power_level_event = auth_events.get(key)
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level = None
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if power_level_event:
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level = power_level_event.content.get("users", {}).get(user_id)
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if not level:
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level = power_level_event.content.get("users_default", 0)
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else:
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key = (EventTypes.Create, "", )
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create_event = auth_events.get(key)
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if (create_event is not None and
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create_event.content["creator"] == user_id):
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return 100
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return level
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def _get_ops_level_from_event_state(self, event, auth_events):
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key = (EventTypes.PowerLevels, "", )
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power_level_event = auth_events.get(key)
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if power_level_event:
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return (
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power_level_event.content.get("ban", 50),
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power_level_event.content.get("kick", 50),
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power_level_event.content.get("redact", 50),
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)
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return None, None, None,
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@defer.inlineCallbacks
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def get_user_by_req(self, request):
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""" Get a registered user's ID.
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Args:
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request - An HTTP request with an access_token query parameter.
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Returns:
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UserID : User ID object of the user making the request
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Raises:
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AuthError if no user by that token exists or the token is invalid.
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"""
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# Can optionally look elsewhere in the request (e.g. headers)
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try:
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access_token = request.args["access_token"][0]
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user_info = yield self.get_user_by_token(access_token)
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user = user_info["user"]
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ip_addr = self.hs.get_ip_from_request(request)
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user_agent = request.requestHeaders.getRawHeaders(
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"User-Agent",
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default=[""]
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)[0]
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if user and access_token and ip_addr:
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yield self.store.insert_client_ip(
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user=user,
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access_token=access_token,
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device_id=user_info["device_id"],
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ip=ip_addr,
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user_agent=user_agent
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)
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defer.returnValue(user)
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except KeyError:
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raise AuthError(403, "Missing access token.")
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@defer.inlineCallbacks
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def get_user_by_token(self, token):
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""" Get a registered user's ID.
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Args:
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token (str): The access token to get the user by.
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Returns:
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dict : dict that includes the user, device_id, and whether the
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user is a server admin.
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Raises:
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AuthError if no user by that token exists or the token is invalid.
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"""
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try:
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ret = yield self.store.get_user_by_token(token=token)
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if not ret:
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raise StoreError()
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user_info = {
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"admin": bool(ret.get("admin", False)),
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"device_id": ret.get("device_id"),
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"user": self.hs.parse_userid(ret.get("name")),
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}
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defer.returnValue(user_info)
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except StoreError:
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raise AuthError(403, "Unrecognised access token.",
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errcode=Codes.UNKNOWN_TOKEN)
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def is_server_admin(self, user):
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return self.store.is_server_admin(user)
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@defer.inlineCallbacks
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def add_auth_events(self, builder, context):
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yield run_on_reactor()
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if builder.type == EventTypes.Create:
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builder.auth_events = []
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return
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auth_ids = []
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key = (EventTypes.PowerLevels, "", )
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power_level_event = context.current_state.get(key)
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if power_level_event:
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auth_ids.append(power_level_event.event_id)
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key = (EventTypes.JoinRules, "", )
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join_rule_event = context.current_state.get(key)
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key = (EventTypes.Member, builder.user_id, )
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member_event = context.current_state.get(key)
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key = (EventTypes.Create, "", )
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create_event = context.current_state.get(key)
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if create_event:
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auth_ids.append(create_event.event_id)
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if join_rule_event:
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join_rule = join_rule_event.content.get("join_rule")
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is_public = join_rule == JoinRules.PUBLIC if join_rule else False
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else:
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is_public = False
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if builder.type == EventTypes.Member:
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e_type = builder.content["membership"]
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if e_type in [Membership.JOIN, Membership.INVITE]:
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if join_rule_event:
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auth_ids.append(join_rule_event.event_id)
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if e_type == Membership.JOIN:
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if member_event and not is_public:
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auth_ids.append(member_event.event_id)
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else:
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if member_event:
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auth_ids.append(member_event.event_id)
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elif member_event:
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if member_event.content["membership"] == Membership.JOIN:
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auth_ids.append(member_event.event_id)
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auth_events_entries = yield self.store.add_event_hashes(
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auth_ids
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)
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builder.auth_events = auth_events_entries
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context.auth_events = {
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k: v
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for k, v in context.current_state.items()
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if v.event_id in auth_ids
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}
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@log_function
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def _can_send_event(self, event, auth_events):
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key = (EventTypes.PowerLevels, "", )
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send_level_event = auth_events.get(key)
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send_level = None
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if send_level_event:
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send_level = send_level_event.content.get("events", {}).get(
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event.type
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)
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if not send_level:
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if hasattr(event, "state_key"):
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send_level = send_level_event.content.get(
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"state_default", 50
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)
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else:
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send_level = send_level_event.content.get(
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"events_default", 0
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)
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if send_level:
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send_level = int(send_level)
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else:
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send_level = 0
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user_level = self._get_power_level_from_event_state(
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event,
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event.user_id,
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auth_events,
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)
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if user_level:
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user_level = int(user_level)
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else:
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user_level = 0
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if user_level < send_level:
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raise AuthError(
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403,
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"You don't have permission to post that to the room. " +
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"user_level (%d) < send_level (%d)" % (user_level, send_level)
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)
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# Check state_key
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if hasattr(event, "state_key"):
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if not event.state_key.startswith("_"):
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if event.state_key.startswith("@"):
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if event.state_key != event.user_id:
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raise AuthError(
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403,
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"You are not allowed to set others state"
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)
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else:
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sender_domain = self.hs.parse_userid(
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event.user_id
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).domain
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|
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if sender_domain != event.state_key:
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raise AuthError(
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403,
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"You are not allowed to set others state"
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)
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return True
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|
|
def _check_redaction(self, event, auth_events):
|
|
user_level = self._get_power_level_from_event_state(
|
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event,
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event.user_id,
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auth_events,
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)
|
|
|
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_, _, redact_level = self._get_ops_level_from_event_state(
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event,
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auth_events,
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)
|
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if user_level < redact_level:
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raise AuthError(
|
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403,
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"You don't have permission to redact events"
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)
|
|
|
|
def _check_power_levels(self, event, auth_events):
|
|
user_list = event.content.get("users", {})
|
|
# Validate users
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|
for k, v in user_list.items():
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|
try:
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self.hs.parse_userid(k)
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|
except:
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raise SynapseError(400, "Not a valid user_id: %s" % (k,))
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try:
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int(v)
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|
except:
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raise SynapseError(400, "Not a valid power level: %s" % (v,))
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|
|
|
key = (event.type, event.state_key, )
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|
current_state = auth_events.get(key)
|
|
|
|
if not current_state:
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return
|
|
|
|
user_level = self._get_power_level_from_event_state(
|
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event,
|
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event.user_id,
|
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auth_events,
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)
|
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|
|
# Check other levels:
|
|
levels_to_check = [
|
|
("users_default", []),
|
|
("events_default", []),
|
|
("ban", []),
|
|
("redact", []),
|
|
("kick", []),
|
|
]
|
|
|
|
old_list = current_state.content.get("users")
|
|
for user in set(old_list.keys() + user_list.keys()):
|
|
levels_to_check.append(
|
|
(user, ["users"])
|
|
)
|
|
|
|
old_list = current_state.content.get("events")
|
|
new_list = event.content.get("events")
|
|
for ev_id in set(old_list.keys() + new_list.keys()):
|
|
levels_to_check.append(
|
|
(ev_id, ["events"])
|
|
)
|
|
|
|
old_state = current_state.content
|
|
new_state = event.content
|
|
|
|
for level_to_check, dir in levels_to_check:
|
|
old_loc = old_state
|
|
for d in dir:
|
|
old_loc = old_loc.get(d, {})
|
|
|
|
new_loc = new_state
|
|
for d in dir:
|
|
new_loc = new_loc.get(d, {})
|
|
|
|
if level_to_check in old_loc:
|
|
old_level = int(old_loc[level_to_check])
|
|
else:
|
|
old_level = None
|
|
|
|
if level_to_check in new_loc:
|
|
new_level = int(new_loc[level_to_check])
|
|
else:
|
|
new_level = None
|
|
|
|
if new_level is not None and old_level is not None:
|
|
if new_level == old_level:
|
|
continue
|
|
|
|
if old_level > user_level or new_level > user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to add ops level greater "
|
|
"than your own"
|
|
)
|