179 lines
6.6 KiB
Python
179 lines
6.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 matrix.org
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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 Membership
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from synapse.api.errors import AuthError, StoreError, Codes
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from synapse.api.events.room import RoomMemberEvent
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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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@defer.inlineCallbacks
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def check(self, event, snapshot, raises=False):
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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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Raises:
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AuthError if there was a problem authorising this event. This will
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be raised only if raises=True.
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"""
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try:
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if hasattr(event, "room_id"):
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if event.type == RoomMemberEvent.TYPE:
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allowed = yield self.is_membership_change_allowed(event)
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defer.returnValue(allowed)
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else:
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self._check_joined_room(
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member=snapshot.membership_state,
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user_id=snapshot.user_id,
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room_id=snapshot.room_id,
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)
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defer.returnValue(True)
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else:
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raise AuthError(500, "Unknown event: %s" % event)
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except AuthError as e:
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logger.info("Event auth check failed on event %s with msg: %s",
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event, e.msg)
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if raises:
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raise e
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defer.returnValue(False)
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@defer.inlineCallbacks
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def check_joined_room(self, room_id, user_id):
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try:
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member = yield self.store.get_room_member(
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room_id=room_id,
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user_id=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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except AttributeError:
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pass
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defer.returnValue(None)
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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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@defer.inlineCallbacks
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def is_membership_change_allowed(self, event):
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target_user_id = event.state_key
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# does this room even exist
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room = yield self.store.get_room(event.room_id)
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if not room:
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raise AuthError(403, "Room does not exist")
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# get info about the caller
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try:
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caller = yield self.store.get_room_member(
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user_id=event.user_id,
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room_id=event.room_id)
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except:
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caller = None
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caller_in_room = caller and caller.membership == "join"
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# get info about the target
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try:
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target = yield self.store.get_room_member(
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user_id=target_user_id,
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room_id=event.room_id)
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except:
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target = None
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target_in_room = target and target.membership == "join"
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membership = event.content["membership"]
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if Membership.INVITE == membership:
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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(403, "You are not in room %s." % event.room_id)
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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 room.is_public:
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pass # anyone can join public rooms.
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elif (not caller or caller.membership not in
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[Membership.INVITE, Membership.JOIN]):
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raise AuthError(403, "You are not invited to this room.")
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elif Membership.LEAVE == membership:
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if not caller_in_room: # trying to leave a room you aren't joined
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raise AuthError(403, "You are not in room %s." % event.room_id)
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elif target_user_id != event.user_id:
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# trying to force another user to leave
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raise AuthError(403, "Cannot force %s to leave." %
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target_user_id)
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else:
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raise AuthError(500, "Unknown membership %s" % membership)
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defer.returnValue(True)
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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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return self.get_user_by_token(request.args["access_token"][0])
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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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UserID : User ID object of the user who has that 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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user_id = yield self.store.get_user_by_token(token=token)
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if not user_id:
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raise StoreError()
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defer.returnValue(self.hs.parse_userid(user_id))
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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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