MatrixSynapse/synapse/api/auth.py

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# -*- coding: utf-8 -*-
# Copyright 2014 matrix.org
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# 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
from synapse.api.constants import Membership
from synapse.api.errors import AuthError, StoreError, Codes
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from synapse.api.events.room import (RoomTopicEvent, RoomMemberEvent,
MessageEvent, FeedbackEvent)
import logging
logger = logging.getLogger(__name__)
class Auth(object):
def __init__(self, hs):
self.hs = hs
self.store = hs.get_datastore()
@defer.inlineCallbacks
def check(self, event, raises=False):
""" Checks if this event is correctly authed.
Returns:
True if the auth checks pass.
Raises:
AuthError if there was a problem authorising this event. This will
be raised only if raises=True.
"""
try:
if hasattr(event, "room_id"):
if event.type == RoomMemberEvent.TYPE:
allowed = yield self.is_membership_change_allowed(event)
defer.returnValue(allowed)
else:
yield self.check_joined_room(event.room_id, event.user_id)
defer.returnValue(True)
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else:
raise AuthError(500, "Unknown event: %s" % event)
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except AuthError as e:
logger.info("Event auth check failed on event %s with msg: %s",
event, e.msg)
if raises:
raise e
defer.returnValue(False)
@defer.inlineCallbacks
def check_joined_room(self, room_id, user_id):
try:
member = yield self.store.get_room_member(
room_id=room_id,
user_id=user_id
)
if not member or member.membership != Membership.JOIN:
raise AuthError(403, "User %s not in room %s" %
(user_id, room_id))
defer.returnValue(member)
except AttributeError:
pass
defer.returnValue(None)
@defer.inlineCallbacks
def is_membership_change_allowed(self, event):
target_user_id = event.state_key
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# does this room even exist
room = yield self.store.get_room(event.room_id)
if not room:
raise AuthError(403, "Room does not exist")
# get info about the caller
try:
caller = yield self.store.get_room_member(
user_id=event.user_id,
room_id=event.room_id)
except:
caller = None
caller_in_room = caller and caller.membership == "join"
# get info about the target
try:
target = yield self.store.get_room_member(
user_id=target_user_id,
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room_id=event.room_id)
except:
target = None
target_in_room = target and target.membership == "join"
membership = event.content["membership"]
if Membership.INVITE == membership:
# Invites are valid iff caller is in the room and target isn't.
if not caller_in_room: # caller isn't joined
raise AuthError(403, "You are not in room %s." % event.room_id)
elif target_in_room: # the target is already in the room.
raise AuthError(403, "%s is already in the room." %
target_user_id)
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elif Membership.JOIN == membership:
# Joins are valid iff caller == target and they were:
# invited: They are accepting the invitation
# joined: It's a NOOP
if event.user_id != target_user_id:
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raise AuthError(403, "Cannot force another user to join.")
elif room.is_public:
pass # anyone can join public rooms.
elif (not caller or caller.membership not in
[Membership.INVITE, Membership.JOIN]):
raise AuthError(403, "You are not invited to this room.")
elif Membership.LEAVE == membership:
if not caller_in_room: # trying to leave a room you aren't joined
raise AuthError(403, "You are not in room %s." % event.room_id)
elif target_user_id != event.user_id:
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# trying to force another user to leave
raise AuthError(403, "Cannot force %s to leave." %
target_user_id)
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else:
raise AuthError(500, "Unknown membership %s" % membership)
defer.returnValue(True)
def get_user_by_req(self, request):
""" Get a registered user's ID.
Args:
request - An HTTP request with an access_token query parameter.
Returns:
UserID : User ID object of the user making the request
Raises:
AuthError if no user by that token exists or the token is invalid.
"""
# Can optionally look elsewhere in the request (e.g. headers)
try:
return self.get_user_by_token(request.args["access_token"][0])
except KeyError:
raise AuthError(403, "Missing access token.")
@defer.inlineCallbacks
def get_user_by_token(self, token):
""" Get a registered user's ID.
Args:
token (str)- The access token to get the user by.
Returns:
UserID : User ID object of the user who has that access token.
Raises:
AuthError if no user by that token exists or the token is invalid.
"""
try:
user_id = yield self.store.get_user_by_token(token=token)
defer.returnValue(self.hs.parse_userid(user_id))
except StoreError:
raise AuthError(403, "Unrecognised access token.",
errcode=Codes.UNKNOWN_TOKEN)