752 lines
26 KiB
Python
752 lines
26 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, Codes, SynapseError
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from synapse.util.logutils import log_function
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from synapse.types import UserID, EventID
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import logging
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import pymacaroons
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logger = logging.getLogger(__name__)
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AuthEventTypes = (
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EventTypes.Create, EventTypes.Member, EventTypes.PowerLevels,
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EventTypes.JoinRules, EventTypes.RoomHistoryVisibility,
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)
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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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self.TOKEN_NOT_FOUND_HTTP_STATUS = 401
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self._KNOWN_CAVEAT_PREFIXES = set([
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"gen = ",
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"type = ",
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"time < ",
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"user_id = ",
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])
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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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Args:
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event: the event being checked.
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auth_events (dict: event-key -> event): the existing room state.
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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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creation_event = auth_events.get((EventTypes.Create, ""), None)
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if not creation_event:
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raise SynapseError(
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403,
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"Room %r does not exist" % (event.room_id,)
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)
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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(
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"Auth events: %s",
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[a.event_id for a in auth_events.values()]
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)
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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, current_state=None):
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if current_state:
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member = current_state.get(
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(EventTypes.Member, user_id),
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None
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)
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else:
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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):
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curr_state = yield self.state.get_current_state(room_id)
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for event in curr_state.values():
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if event.type == EventTypes.Member:
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try:
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if UserID.from_string(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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target_banned = target and target.membership == Membership.BAN
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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_user_power_level(event.user_id, auth_events)
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target_level = self._get_user_power_level(
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target_user_id, auth_events
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)
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# FIXME (erikj): What should we do here as the default?
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ban_level = self._get_named_level(auth_events, "ban", 50)
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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_banned": target_banned,
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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.JOIN != membership:
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# JOIN is the only action you can perform if you're not in the room
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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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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 target_banned:
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raise AuthError(
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403, "%s is banned from the room" % (target_user_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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else:
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invite_level = self._get_named_level(auth_events, "invite", 0)
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if user_level < invite_level:
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raise AuthError(
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403, "You cannot invite user %s." % target_user_id
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)
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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 target_banned:
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raise AuthError(403, "You are banned from this room")
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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 target_banned and user_level < ban_level:
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raise AuthError(
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403, "You cannot unban user &s." % (target_user_id,)
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)
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elif target_user_id != event.user_id:
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kick_level = self._get_named_level(auth_events, "kick", 50)
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if user_level < kick_level or user_level <= target_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 user_level < ban_level or user_level <= target_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_event(self, auth_events):
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key = (EventTypes.PowerLevels, "", )
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return auth_events.get(key)
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def _get_user_power_level(self, user_id, auth_events):
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power_level_event = self._get_power_level_event(auth_events)
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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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if level is None:
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return 0
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else:
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return int(level)
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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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else:
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return 0
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def _get_named_level(self, auth_events, name, default):
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power_level_event = self._get_power_level_event(auth_events)
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if not power_level_event:
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return default
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level = power_level_event.content.get(name, None)
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if level is not None:
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return int(level)
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else:
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return default
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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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tuple of:
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UserID (str)
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Access token ID (str)
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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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# Check for application service tokens with a user_id override
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try:
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app_service = yield self.store.get_app_service_by_token(
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access_token
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)
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if not app_service:
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raise KeyError
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user_id = app_service.sender
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if "user_id" in request.args:
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user_id = request.args["user_id"][0]
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if not app_service.is_interested_in_user(user_id):
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raise AuthError(
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403,
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"Application service cannot masquerade as this user."
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)
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if not user_id:
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raise KeyError
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request.authenticated_entity = user_id
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defer.returnValue((UserID.from_string(user_id), ""))
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return
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except KeyError:
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pass # normal users won't have the user_id query parameter set.
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user_info = yield self._get_user_by_access_token(access_token)
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user = user_info["user"]
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token_id = user_info["token_id"]
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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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self.store.insert_client_ip(
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user=user,
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access_token=access_token,
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ip=ip_addr,
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user_agent=user_agent
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)
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request.authenticated_entity = user.to_string()
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defer.returnValue((user, token_id,))
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except KeyError:
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raise AuthError(
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self.TOKEN_NOT_FOUND_HTTP_STATUS, "Missing access token.",
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errcode=Codes.MISSING_TOKEN
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)
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@defer.inlineCallbacks
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def _get_user_by_access_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 and the ID of their access token.
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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._get_user_from_macaroon(token)
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except AuthError:
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# TODO(daniel): Remove this fallback when all existing access tokens
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# have been re-issued as macaroons.
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ret = yield self._look_up_user_by_access_token(token)
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defer.returnValue(ret)
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@defer.inlineCallbacks
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def _get_user_from_macaroon(self, macaroon_str):
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try:
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macaroon = pymacaroons.Macaroon.deserialize(macaroon_str)
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self._validate_macaroon(macaroon)
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user_prefix = "user_id = "
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for caveat in macaroon.caveats:
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if caveat.caveat_id.startswith(user_prefix):
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user = UserID.from_string(caveat.caveat_id[len(user_prefix):])
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# This codepath exists so that we can actually return a
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# token ID, because we use token IDs in place of device
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# identifiers throughout the codebase.
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# TODO(daniel): Remove this fallback when device IDs are
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# properly implemented.
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ret = yield self._look_up_user_by_access_token(macaroon_str)
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if ret["user"] != user:
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logger.error(
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"Macaroon user (%s) != DB user (%s)",
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user,
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ret["user"]
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)
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raise AuthError(
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self.TOKEN_NOT_FOUND_HTTP_STATUS,
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"User mismatch in macaroon",
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errcode=Codes.UNKNOWN_TOKEN
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)
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defer.returnValue(ret)
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raise AuthError(
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self.TOKEN_NOT_FOUND_HTTP_STATUS, "No user caveat in macaroon",
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errcode=Codes.UNKNOWN_TOKEN
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)
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except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
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raise AuthError(
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self.TOKEN_NOT_FOUND_HTTP_STATUS, "Invalid macaroon passed.",
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errcode=Codes.UNKNOWN_TOKEN
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)
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def _validate_macaroon(self, macaroon):
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v = pymacaroons.Verifier()
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v.satisfy_exact("gen = 1")
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v.satisfy_exact("type = access")
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v.satisfy_general(lambda c: c.startswith("user_id = "))
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v.satisfy_general(self._verify_expiry)
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v.verify(macaroon, self.hs.config.macaroon_secret_key)
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v = pymacaroons.Verifier()
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v.satisfy_general(self._verify_recognizes_caveats)
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v.verify(macaroon, self.hs.config.macaroon_secret_key)
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def _verify_expiry(self, caveat):
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prefix = "time < "
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if not caveat.startswith(prefix):
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return False
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# TODO(daniel): Enable expiry check when clients actually know how to
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# refresh tokens. (And remember to enable the tests)
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return True
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expiry = int(caveat[len(prefix):])
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now = self.hs.get_clock().time_msec()
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return now < expiry
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def _verify_recognizes_caveats(self, caveat):
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first_space = caveat.find(" ")
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if first_space < 0:
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return False
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second_space = caveat.find(" ", first_space + 1)
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if second_space < 0:
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return False
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return caveat[:second_space + 1] in self._KNOWN_CAVEAT_PREFIXES
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@defer.inlineCallbacks
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def _look_up_user_by_access_token(self, token):
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ret = yield self.store.get_user_by_access_token(token)
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if not ret:
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raise AuthError(
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self.TOKEN_NOT_FOUND_HTTP_STATUS, "Unrecognised access token.",
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errcode=Codes.UNKNOWN_TOKEN
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)
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user_info = {
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"user": UserID.from_string(ret.get("name")),
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"token_id": ret.get("token_id", None),
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}
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defer.returnValue(user_info)
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@defer.inlineCallbacks
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def get_appservice_by_req(self, request):
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try:
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token = request.args["access_token"][0]
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service = yield self.store.get_app_service_by_token(token)
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if not service:
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raise AuthError(
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self.TOKEN_NOT_FOUND_HTTP_STATUS,
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"Unrecognised access token.",
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errcode=Codes.UNKNOWN_TOKEN
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|
)
|
|
request.authenticated_entity = service.sender
|
|
defer.returnValue(service)
|
|
except KeyError:
|
|
raise AuthError(
|
|
self.TOKEN_NOT_FOUND_HTTP_STATUS, "Missing access token."
|
|
)
|
|
|
|
def is_server_admin(self, user):
|
|
return self.store.is_server_admin(user)
|
|
|
|
@defer.inlineCallbacks
|
|
def add_auth_events(self, builder, context):
|
|
auth_ids = self.compute_auth_events(builder, context.current_state)
|
|
|
|
auth_events_entries = yield self.store.add_event_hashes(
|
|
auth_ids
|
|
)
|
|
|
|
builder.auth_events = auth_events_entries
|
|
|
|
def compute_auth_events(self, event, current_state):
|
|
if event.type == EventTypes.Create:
|
|
return []
|
|
|
|
auth_ids = []
|
|
|
|
key = (EventTypes.PowerLevels, "", )
|
|
power_level_event = current_state.get(key)
|
|
|
|
if power_level_event:
|
|
auth_ids.append(power_level_event.event_id)
|
|
|
|
key = (EventTypes.JoinRules, "", )
|
|
join_rule_event = current_state.get(key)
|
|
|
|
key = (EventTypes.Member, event.user_id, )
|
|
member_event = current_state.get(key)
|
|
|
|
key = (EventTypes.Create, "", )
|
|
create_event = current_state.get(key)
|
|
if create_event:
|
|
auth_ids.append(create_event.event_id)
|
|
|
|
if join_rule_event:
|
|
join_rule = join_rule_event.content.get("join_rule")
|
|
is_public = join_rule == JoinRules.PUBLIC if join_rule else False
|
|
else:
|
|
is_public = False
|
|
|
|
if event.type == EventTypes.Member:
|
|
e_type = event.content["membership"]
|
|
if e_type in [Membership.JOIN, Membership.INVITE]:
|
|
if join_rule_event:
|
|
auth_ids.append(join_rule_event.event_id)
|
|
|
|
if e_type == Membership.JOIN:
|
|
if member_event and not is_public:
|
|
auth_ids.append(member_event.event_id)
|
|
else:
|
|
if member_event:
|
|
auth_ids.append(member_event.event_id)
|
|
elif member_event:
|
|
if member_event.content["membership"] == Membership.JOIN:
|
|
auth_ids.append(member_event.event_id)
|
|
|
|
return auth_ids
|
|
|
|
@log_function
|
|
def _can_send_event(self, event, auth_events):
|
|
key = (EventTypes.PowerLevels, "", )
|
|
send_level_event = auth_events.get(key)
|
|
send_level = None
|
|
if send_level_event:
|
|
send_level = send_level_event.content.get("events", {}).get(
|
|
event.type
|
|
)
|
|
if send_level is None:
|
|
if hasattr(event, "state_key"):
|
|
send_level = send_level_event.content.get(
|
|
"state_default", 50
|
|
)
|
|
else:
|
|
send_level = send_level_event.content.get(
|
|
"events_default", 0
|
|
)
|
|
|
|
if send_level:
|
|
send_level = int(send_level)
|
|
else:
|
|
send_level = 0
|
|
|
|
user_level = self._get_user_power_level(event.user_id, auth_events)
|
|
|
|
if user_level < send_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to post that to the room. " +
|
|
"user_level (%d) < send_level (%d)" % (user_level, send_level)
|
|
)
|
|
|
|
# Check state_key
|
|
if hasattr(event, "state_key"):
|
|
if event.state_key.startswith("@"):
|
|
if event.state_key != event.user_id:
|
|
raise AuthError(
|
|
403,
|
|
"You are not allowed to set others state"
|
|
)
|
|
else:
|
|
sender_domain = UserID.from_string(
|
|
event.user_id
|
|
).domain
|
|
|
|
if sender_domain != event.state_key:
|
|
raise AuthError(
|
|
403,
|
|
"You are not allowed to set others state"
|
|
)
|
|
|
|
return True
|
|
|
|
def check_redaction(self, event, auth_events):
|
|
"""Check whether the event sender is allowed to redact the target event.
|
|
|
|
Returns:
|
|
True if the the sender is allowed to redact the target event if the
|
|
target event was created by them.
|
|
False if the sender is allowed to redact the target event with no
|
|
further checks.
|
|
|
|
Raises:
|
|
AuthError if the event sender is definitely not allowed to redact
|
|
the target event.
|
|
"""
|
|
user_level = self._get_user_power_level(event.user_id, auth_events)
|
|
|
|
redact_level = self._get_named_level(auth_events, "redact", 50)
|
|
|
|
if user_level > redact_level:
|
|
return False
|
|
|
|
redacter_domain = EventID.from_string(event.event_id).domain
|
|
redactee_domain = EventID.from_string(event.redacts).domain
|
|
if redacter_domain == redactee_domain:
|
|
return True
|
|
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to redact events"
|
|
)
|
|
|
|
def _check_power_levels(self, event, auth_events):
|
|
user_list = event.content.get("users", {})
|
|
# Validate users
|
|
for k, v in user_list.items():
|
|
try:
|
|
UserID.from_string(k)
|
|
except:
|
|
raise SynapseError(400, "Not a valid user_id: %s" % (k,))
|
|
|
|
try:
|
|
int(v)
|
|
except:
|
|
raise SynapseError(400, "Not a valid power level: %s" % (v,))
|
|
|
|
key = (event.type, event.state_key, )
|
|
current_state = auth_events.get(key)
|
|
|
|
if not current_state:
|
|
return
|
|
|
|
user_level = self._get_user_power_level(event.user_id, auth_events)
|
|
|
|
# Check other levels:
|
|
levels_to_check = [
|
|
("users_default", None),
|
|
("events_default", None),
|
|
("state_default", None),
|
|
("ban", None),
|
|
("redact", None),
|
|
("kick", None),
|
|
("invite", None),
|
|
]
|
|
|
|
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
|
|
new_loc = new_state
|
|
if dir:
|
|
old_loc = old_loc.get(dir, {})
|
|
new_loc = new_loc.get(dir, {})
|
|
|
|
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 dir == "users" and level_to_check != event.user_id:
|
|
if old_level == user_level:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to remove ops level equal "
|
|
"to your own"
|
|
)
|
|
|
|
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"
|
|
)
|