mirror of
https://mau.dev/maunium/synapse.git
synced 2024-09-05 09:02:13 +00:00
![Daniel Wagner-Hall](/assets/img/avatar_default.png)
A couple of weird caveats: * If we can't validate your macaroon, we fall back to checking that your access token is in the DB, and ignoring the failure * Even if we can validate your macaroon, we still have to hit the DB to get the access token ID, which we pretend is a device ID all over the codebase. This mostly adds the interesting code, and points out the two pieces we need to delete (and necessary conditions) in order to fix the above caveats.
725 lines
25 KiB
Python
725 lines
25 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
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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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# 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_id = user_info["user_id"]
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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_id and access_token and ip_addr:
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self.store.insert_client_ip(
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user=user_id,
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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_id.to_string()
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defer.returnValue((user_id, 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_id = 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_id"] != user_id:
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logger.error(
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"Macaroon user (%s) != DB user (%s)",
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user_id,
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ret["user_id"]
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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_id": 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)
|
|
if not service:
|
|
raise AuthError(
|
|
self.TOKEN_NOT_FOUND_HTTP_STATUS,
|
|
"Unrecognised access token.",
|
|
errcode=Codes.UNKNOWN_TOKEN
|
|
)
|
|
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):
|
|
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:
|
|
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"
|
|
)
|