687 lines
26 KiB
Python
687 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 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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import logging
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from typing import List, Optional, Tuple
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import pymacaroons
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from netaddr import IPAddress
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from twisted.web.server import Request
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import synapse.types
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from synapse import event_auth
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from synapse.api.auth_blocking import AuthBlocking
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import (
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AuthError,
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Codes,
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InvalidClientTokenError,
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MissingClientTokenError,
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)
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
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from synapse.events import EventBase
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from synapse.logging import opentracing as opentracing
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from synapse.types import StateMap, UserID
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from synapse.util.caches import register_cache
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from synapse.util.caches.lrucache import LruCache
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from synapse.util.metrics import Measure
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logger = logging.getLogger(__name__)
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AuthEventTypes = (
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EventTypes.Create,
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EventTypes.Member,
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EventTypes.PowerLevels,
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EventTypes.JoinRules,
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EventTypes.RoomHistoryVisibility,
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EventTypes.ThirdPartyInvite,
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)
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# guests always get this device id.
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GUEST_DEVICE_ID = "guest_device"
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class _InvalidMacaroonException(Exception):
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pass
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class Auth(object):
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"""
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FIXME: This class contains a mix of functions for authenticating users
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of our client-server API and authenticating events added to room graphs.
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"""
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def __init__(self, hs):
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self.hs = hs
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self.clock = hs.get_clock()
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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_cache = LruCache(10000)
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register_cache("cache", "token_cache", self.token_cache)
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self._auth_blocking = AuthBlocking(self.hs)
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self._account_validity = hs.config.account_validity
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self._track_appservice_user_ips = hs.config.track_appservice_user_ips
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self._macaroon_secret_key = hs.config.macaroon_secret_key
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async def check_from_context(
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self, room_version: str, event, context, do_sig_check=True
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):
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prev_state_ids = await context.get_prev_state_ids()
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auth_events_ids = self.compute_auth_events(
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event, prev_state_ids, for_verification=True
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)
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auth_events = await self.store.get_events(auth_events_ids)
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auth_events = {(e.type, e.state_key): e for e in auth_events.values()}
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room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
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event_auth.check(
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room_version_obj, event, auth_events=auth_events, do_sig_check=do_sig_check
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)
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async def check_user_in_room(
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self,
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room_id: str,
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user_id: str,
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current_state: Optional[StateMap[EventBase]] = None,
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allow_departed_users: bool = False,
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) -> EventBase:
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"""Check if the user is in the room, or was at some point.
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Args:
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room_id: The room to check.
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user_id: The user to check.
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current_state: Optional map of the current state of the room.
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If provided then that map is used to check whether they are a
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member of the room. Otherwise the current membership is
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loaded from the database.
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allow_departed_users: if True, accept users that were previously
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members but have now departed.
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Raises:
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AuthError if the user is/was not in the room.
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Returns:
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Membership event for the user if the user was in the
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room. This will be the join event if they are currently joined to
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the room. This will be the leave event if they have left the room.
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"""
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if current_state:
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member = current_state.get((EventTypes.Member, user_id), None)
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else:
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member = await self.state.get_current_state(
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room_id=room_id, event_type=EventTypes.Member, state_key=user_id
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)
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if member:
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membership = member.membership
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if membership == Membership.JOIN:
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return member
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# XXX this looks totally bogus. Why do we not allow users who have been banned,
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# or those who were members previously and have been re-invited?
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if allow_departed_users and membership == Membership.LEAVE:
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forgot = await self.store.did_forget(user_id, room_id)
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if not forgot:
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return member
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raise AuthError(403, "User %s not in room %s" % (user_id, room_id))
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async def check_host_in_room(self, room_id, host):
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with Measure(self.clock, "check_host_in_room"):
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latest_event_ids = await self.store.is_host_joined(room_id, host)
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return latest_event_ids
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def can_federate(self, event, auth_events):
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creation_event = auth_events.get((EventTypes.Create, ""))
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return creation_event.content.get("m.federate", True) is True
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def get_public_keys(self, invite_event):
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return event_auth.get_public_keys(invite_event)
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async def get_user_by_req(
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self,
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request: Request,
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allow_guest: bool = False,
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rights: str = "access",
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allow_expired: bool = False,
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) -> synapse.types.Requester:
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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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allow_guest: If False, will raise an AuthError if the user making the
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request is a guest.
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rights: The operation being performed; the access token must allow this
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allow_expired: If True, allow the request through even if the account
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is expired, or session token lifetime has ended. Note that
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/login will deliver access tokens regardless of expiration.
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Returns:
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Resolves to the requester
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Raises:
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InvalidClientCredentialsError if no user by that token exists or the token
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is invalid.
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AuthError if access is denied for the user in the access token
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"""
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try:
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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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b"User-Agent", default=[b""]
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)[0].decode("ascii", "surrogateescape")
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access_token = self.get_access_token_from_request(request)
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user_id, app_service = await self._get_appservice_user_id(request)
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if user_id:
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request.authenticated_entity = user_id
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opentracing.set_tag("authenticated_entity", user_id)
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opentracing.set_tag("appservice_id", app_service.id)
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if ip_addr and self._track_appservice_user_ips:
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await self.store.insert_client_ip(
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user_id=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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device_id="dummy-device", # stubbed
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)
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return synapse.types.create_requester(user_id, app_service=app_service)
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user_info = await self.get_user_by_access_token(
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access_token, rights, allow_expired=allow_expired
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)
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user = user_info["user"]
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token_id = user_info["token_id"]
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is_guest = user_info["is_guest"]
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shadow_banned = user_info["shadow_banned"]
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# Deny the request if the user account has expired.
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if self._account_validity.enabled and not allow_expired:
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user_id = user.to_string()
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expiration_ts = await self.store.get_expiration_ts_for_user(user_id)
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if (
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expiration_ts is not None
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and self.clock.time_msec() >= expiration_ts
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):
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raise AuthError(
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403, "User account has expired", errcode=Codes.EXPIRED_ACCOUNT
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)
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# device_id may not be present if get_user_by_access_token has been
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# stubbed out.
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device_id = user_info.get("device_id")
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if user and access_token and ip_addr:
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await self.store.insert_client_ip(
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user_id=user.to_string(),
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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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device_id=device_id,
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)
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if is_guest and not allow_guest:
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raise AuthError(
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403,
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"Guest access not allowed",
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errcode=Codes.GUEST_ACCESS_FORBIDDEN,
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)
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request.authenticated_entity = user.to_string()
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opentracing.set_tag("authenticated_entity", user.to_string())
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if device_id:
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opentracing.set_tag("device_id", device_id)
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return synapse.types.create_requester(
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user,
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token_id,
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is_guest,
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shadow_banned,
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device_id,
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app_service=app_service,
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)
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except KeyError:
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raise MissingClientTokenError()
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async def _get_appservice_user_id(self, request):
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app_service = self.store.get_app_service_by_token(
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self.get_access_token_from_request(request)
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)
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if app_service is None:
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return None, None
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if app_service.ip_range_whitelist:
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ip_address = IPAddress(self.hs.get_ip_from_request(request))
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if ip_address not in app_service.ip_range_whitelist:
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return None, None
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if b"user_id" not in request.args:
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return app_service.sender, app_service
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user_id = request.args[b"user_id"][0].decode("utf8")
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if app_service.sender == user_id:
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return app_service.sender, app_service
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if not app_service.is_interested_in_user(user_id):
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raise AuthError(403, "Application service cannot masquerade as this user.")
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if not (await self.store.get_user_by_id(user_id)):
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raise AuthError(403, "Application service has not registered this user")
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return user_id, app_service
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async def get_user_by_access_token(
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self, token: str, rights: str = "access", allow_expired: bool = False,
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) -> dict:
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""" Validate access token and get user_id from it
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Args:
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token: The access token to get the user by
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rights: The operation being performed; the access token must
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allow this
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allow_expired: If False, raises an InvalidClientTokenError
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if the token is expired
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Returns:
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dict that includes:
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`user` (UserID)
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`is_guest` (bool)
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`shadow_banned` (bool)
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`token_id` (int|None): access token id. May be None if guest
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`device_id` (str|None): device corresponding to access token
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Raises:
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InvalidClientTokenError if a user by that token exists, but the token is
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expired
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InvalidClientCredentialsError if no user by that token exists or the token
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is invalid
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"""
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if rights == "access":
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# first look in the database
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r = await self._look_up_user_by_access_token(token)
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if r:
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valid_until_ms = r["valid_until_ms"]
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if (
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not allow_expired
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and valid_until_ms is not None
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and valid_until_ms < self.clock.time_msec()
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):
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# there was a valid access token, but it has expired.
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# soft-logout the user.
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raise InvalidClientTokenError(
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msg="Access token has expired", soft_logout=True
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)
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return r
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# otherwise it needs to be a valid macaroon
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try:
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user_id, guest = self._parse_and_validate_macaroon(token, rights)
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user = UserID.from_string(user_id)
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if rights == "access":
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if not guest:
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# non-guest access tokens must be in the database
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logger.warning("Unrecognised access token - not in store.")
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raise InvalidClientTokenError()
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# Guest access tokens are not stored in the database (there can
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# only be one access token per guest, anyway).
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#
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# In order to prevent guest access tokens being used as regular
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# user access tokens (and hence getting around the invalidation
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# process), we look up the user id and check that it is indeed
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# a guest user.
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#
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# It would of course be much easier to store guest access
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# tokens in the database as well, but that would break existing
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# guest tokens.
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stored_user = await self.store.get_user_by_id(user_id)
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if not stored_user:
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raise InvalidClientTokenError("Unknown user_id %s" % user_id)
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if not stored_user["is_guest"]:
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raise InvalidClientTokenError(
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"Guest access token used for regular user"
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)
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ret = {
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"user": user,
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"is_guest": True,
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"shadow_banned": False,
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"token_id": None,
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# all guests get the same device id
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"device_id": GUEST_DEVICE_ID,
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}
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elif rights == "delete_pusher":
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# We don't store these tokens in the database
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ret = {
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"user": user,
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"is_guest": False,
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"shadow_banned": False,
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"token_id": None,
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"device_id": None,
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}
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else:
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raise RuntimeError("Unknown rights setting %s", rights)
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return ret
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except (
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_InvalidMacaroonException,
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pymacaroons.exceptions.MacaroonException,
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TypeError,
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ValueError,
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) as e:
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logger.warning("Invalid macaroon in auth: %s %s", type(e), e)
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raise InvalidClientTokenError("Invalid macaroon passed.")
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def _parse_and_validate_macaroon(self, token, rights="access"):
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"""Takes a macaroon and tries to parse and validate it. This is cached
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if and only if rights == access and there isn't an expiry.
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On invalid macaroon raises _InvalidMacaroonException
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Returns:
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(user_id, is_guest)
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"""
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if rights == "access":
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cached = self.token_cache.get(token, None)
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if cached:
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return cached
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try:
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macaroon = pymacaroons.Macaroon.deserialize(token)
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except Exception: # deserialize can throw more-or-less anything
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# doesn't look like a macaroon: treat it as an opaque token which
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# must be in the database.
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# TODO: it would be nice to get rid of this, but apparently some
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# people use access tokens which aren't macaroons
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raise _InvalidMacaroonException()
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try:
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user_id = self.get_user_id_from_macaroon(macaroon)
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guest = False
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for caveat in macaroon.caveats:
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if caveat.caveat_id == "guest = true":
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guest = True
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self.validate_macaroon(macaroon, rights, user_id=user_id)
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except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
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raise InvalidClientTokenError("Invalid macaroon passed.")
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if rights == "access":
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self.token_cache[token] = (user_id, guest)
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return user_id, guest
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def get_user_id_from_macaroon(self, macaroon):
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"""Retrieve the user_id given by the caveats on the macaroon.
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Does *not* validate the macaroon.
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Args:
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macaroon (pymacaroons.Macaroon): The macaroon to validate
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Returns:
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(str) user id
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Raises:
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InvalidClientCredentialsError if there is no user_id caveat in the
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macaroon
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"""
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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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return caveat.caveat_id[len(user_prefix) :]
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raise InvalidClientTokenError("No user caveat in macaroon")
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def validate_macaroon(self, macaroon, type_string, user_id):
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"""
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validate that a Macaroon is understood by and was signed by this server.
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Args:
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macaroon(pymacaroons.Macaroon): The macaroon to validate
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type_string(str): The kind of token required (e.g. "access",
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"delete_pusher")
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user_id (str): The user_id required
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"""
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v = pymacaroons.Verifier()
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# the verifier runs a test for every caveat on the macaroon, to check
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# that it is met for the current request. Each caveat must match at
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# least one of the predicates specified by satisfy_exact or
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# specify_general.
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v.satisfy_exact("gen = 1")
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v.satisfy_exact("type = " + type_string)
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v.satisfy_exact("user_id = %s" % user_id)
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v.satisfy_exact("guest = true")
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v.satisfy_general(self._verify_expiry)
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# access_tokens include a nonce for uniqueness: any value is acceptable
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v.satisfy_general(lambda c: c.startswith("nonce = "))
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v.verify(macaroon, self._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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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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async def _look_up_user_by_access_token(self, token):
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ret = await self.store.get_user_by_access_token(token)
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if not ret:
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return None
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# we use ret.get() below because *lots* of unit tests stub out
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# get_user_by_access_token in a way where it only returns a couple of
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# the fields.
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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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"is_guest": False,
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"shadow_banned": ret.get("shadow_banned"),
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"device_id": ret.get("device_id"),
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"valid_until_ms": ret.get("valid_until_ms"),
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}
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return user_info
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|
def get_appservice_by_req(self, request):
|
|
token = self.get_access_token_from_request(request)
|
|
service = self.store.get_app_service_by_token(token)
|
|
if not service:
|
|
logger.warning("Unrecognised appservice access token.")
|
|
raise InvalidClientTokenError()
|
|
request.authenticated_entity = service.sender
|
|
return service
|
|
|
|
async def is_server_admin(self, user: UserID) -> bool:
|
|
""" Check if the given user is a local server admin.
|
|
|
|
Args:
|
|
user: user to check
|
|
|
|
Returns:
|
|
True if the user is an admin
|
|
"""
|
|
return await self.store.is_server_admin(user)
|
|
|
|
def compute_auth_events(
|
|
self, event, current_state_ids: StateMap[str], for_verification: bool = False,
|
|
) -> List[str]:
|
|
"""Given an event and current state return the list of event IDs used
|
|
to auth an event.
|
|
|
|
If `for_verification` is False then only return auth events that
|
|
should be added to the event's `auth_events`.
|
|
|
|
Returns:
|
|
List of event IDs.
|
|
"""
|
|
|
|
if event.type == EventTypes.Create:
|
|
return []
|
|
|
|
# Currently we ignore the `for_verification` flag even though there are
|
|
# some situations where we can drop particular auth events when adding
|
|
# to the event's `auth_events` (e.g. joins pointing to previous joins
|
|
# when room is publicly joinable). Dropping event IDs has the
|
|
# advantage that the auth chain for the room grows slower, but we use
|
|
# the auth chain in state resolution v2 to order events, which means
|
|
# care must be taken if dropping events to ensure that it doesn't
|
|
# introduce undesirable "state reset" behaviour.
|
|
#
|
|
# All of which sounds a bit tricky so we don't bother for now.
|
|
|
|
auth_ids = []
|
|
for etype, state_key in event_auth.auth_types_for_event(event):
|
|
auth_ev_id = current_state_ids.get((etype, state_key))
|
|
if auth_ev_id:
|
|
auth_ids.append(auth_ev_id)
|
|
|
|
return auth_ids
|
|
|
|
async def check_can_change_room_list(self, room_id: str, user: UserID):
|
|
"""Determine whether the user is allowed to edit the room's entry in the
|
|
published room list.
|
|
|
|
Args:
|
|
room_id
|
|
user
|
|
"""
|
|
|
|
is_admin = await self.is_server_admin(user)
|
|
if is_admin:
|
|
return True
|
|
|
|
user_id = user.to_string()
|
|
await self.check_user_in_room(room_id, user_id)
|
|
|
|
# We currently require the user is a "moderator" in the room. We do this
|
|
# by checking if they would (theoretically) be able to change the
|
|
# m.room.canonical_alias events
|
|
power_level_event = await self.state.get_current_state(
|
|
room_id, EventTypes.PowerLevels, ""
|
|
)
|
|
|
|
auth_events = {}
|
|
if power_level_event:
|
|
auth_events[(EventTypes.PowerLevels, "")] = power_level_event
|
|
|
|
send_level = event_auth.get_send_level(
|
|
EventTypes.CanonicalAlias, "", power_level_event
|
|
)
|
|
user_level = event_auth.get_user_power_level(user_id, auth_events)
|
|
|
|
return user_level >= send_level
|
|
|
|
@staticmethod
|
|
def has_access_token(request: Request):
|
|
"""Checks if the request has an access_token.
|
|
|
|
Returns:
|
|
bool: False if no access_token was given, True otherwise.
|
|
"""
|
|
query_params = request.args.get(b"access_token")
|
|
auth_headers = request.requestHeaders.getRawHeaders(b"Authorization")
|
|
return bool(query_params) or bool(auth_headers)
|
|
|
|
@staticmethod
|
|
def get_access_token_from_request(request: Request):
|
|
"""Extracts the access_token from the request.
|
|
|
|
Args:
|
|
request: The http request.
|
|
Returns:
|
|
unicode: The access_token
|
|
Raises:
|
|
MissingClientTokenError: If there isn't a single access_token in the
|
|
request
|
|
"""
|
|
|
|
auth_headers = request.requestHeaders.getRawHeaders(b"Authorization")
|
|
query_params = request.args.get(b"access_token")
|
|
if auth_headers:
|
|
# Try the get the access_token from a "Authorization: Bearer"
|
|
# header
|
|
if query_params is not None:
|
|
raise MissingClientTokenError(
|
|
"Mixing Authorization headers and access_token query parameters."
|
|
)
|
|
if len(auth_headers) > 1:
|
|
raise MissingClientTokenError("Too many Authorization headers.")
|
|
parts = auth_headers[0].split(b" ")
|
|
if parts[0] == b"Bearer" and len(parts) == 2:
|
|
return parts[1].decode("ascii")
|
|
else:
|
|
raise MissingClientTokenError("Invalid Authorization header.")
|
|
else:
|
|
# Try to get the access_token from the query params.
|
|
if not query_params:
|
|
raise MissingClientTokenError()
|
|
|
|
return query_params[0].decode("ascii")
|
|
|
|
async def check_user_in_room_or_world_readable(
|
|
self, room_id: str, user_id: str, allow_departed_users: bool = False
|
|
) -> Tuple[str, Optional[str]]:
|
|
"""Checks that the user is or was in the room or the room is world
|
|
readable. If it isn't then an exception is raised.
|
|
|
|
Args:
|
|
room_id: room to check
|
|
user_id: user to check
|
|
allow_departed_users: if True, accept users that were previously
|
|
members but have now departed
|
|
|
|
Returns:
|
|
Resolves to the current membership of the user in the room and the
|
|
membership event ID of the user. If the user is not in the room and
|
|
never has been, then `(Membership.JOIN, None)` is returned.
|
|
"""
|
|
|
|
try:
|
|
# check_user_in_room will return the most recent membership
|
|
# event for the user if:
|
|
# * The user is a non-guest user, and was ever in the room
|
|
# * The user is a guest user, and has joined the room
|
|
# else it will throw.
|
|
member_event = await self.check_user_in_room(
|
|
room_id, user_id, allow_departed_users=allow_departed_users
|
|
)
|
|
return member_event.membership, member_event.event_id
|
|
except AuthError:
|
|
visibility = await self.state.get_current_state(
|
|
room_id, EventTypes.RoomHistoryVisibility, ""
|
|
)
|
|
if (
|
|
visibility
|
|
and visibility.content["history_visibility"] == "world_readable"
|
|
):
|
|
return Membership.JOIN, None
|
|
raise AuthError(
|
|
403,
|
|
"User %s not in room %s, and room previews are disabled"
|
|
% (user_id, room_id),
|
|
)
|
|
|
|
def check_auth_blocking(self, *args, **kwargs):
|
|
return self._auth_blocking.check_auth_blocking(*args, **kwargs)
|