mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-25 13:19:22 -05:00
5ca2cfadc3
Previously we tried to be clever and filter out some unnecessary event IDs to keep the auth chain small, but that had some annoying interactions with state res v2 so we stop doing that for now.
737 lines
28 KiB
Python
737 lines
28 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 Dict, Tuple
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from six import itervalues
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import pymacaroons
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from netaddr import IPAddress
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from twisted.internet import defer
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import synapse.logging.opentracing as opentracing
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import synapse.types
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from synapse import event_auth
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from synapse.api.constants import EventTypes, LimitBlockingTypes, Membership, UserTypes
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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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ResourceLimitError,
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)
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from synapse.config.server import is_threepid_reserved
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from synapse.types import UserID
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from synapse.util.caches import CACHE_SIZE_FACTOR, 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(CACHE_SIZE_FACTOR * 10000)
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register_cache("cache", "token_cache", self.token_cache)
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self._account_validity = hs.config.account_validity
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@defer.inlineCallbacks
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def check_from_context(self, room_version, event, context, do_sig_check=True):
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prev_state_ids = yield context.get_prev_state_ids(self.store)
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auth_events_ids = yield 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 = yield self.store.get_events(auth_events_ids)
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auth_events = {(e.type, e.state_key): e for e in itervalues(auth_events)}
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event_auth.check(
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room_version, event, auth_events=auth_events, do_sig_check=do_sig_check
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)
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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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"""Check if the user is currently joined in the room
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Args:
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room_id(str): The room to check.
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user_id(str): The user to check.
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current_state(dict): 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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Raises:
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AuthError if the user is not in the room.
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Returns:
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A deferred membership event for the user if the user is in
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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 = yield 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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self._check_joined_room(member, user_id, room_id)
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return member
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@defer.inlineCallbacks
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def check_user_was_in_room(self, room_id, user_id):
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"""Check if the user was in the room at some point.
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Args:
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room_id(str): The room to check.
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user_id(str): The user to check.
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Raises:
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AuthError if the user was never in the room.
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Returns:
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A deferred 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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member = yield 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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membership = member.membership if member else None
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if membership not in (Membership.JOIN, Membership.LEAVE):
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raise AuthError(403, "User %s not in room %s" % (user_id, room_id))
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if membership == Membership.LEAVE:
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forgot = yield self.store.did_forget(user_id, room_id)
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if forgot:
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raise AuthError(403, "User %s not in room %s" % (user_id, room_id))
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return member
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@defer.inlineCallbacks
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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 = yield self.store.is_host_joined(room_id, host)
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return latest_event_ids
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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(
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403, "User %s not in room %s (%s)" % (user_id, room_id, repr(member))
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)
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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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@defer.inlineCallbacks
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def get_user_by_req(
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self, request, allow_guest=False, rights="access", allow_expired=False
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):
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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_expired - Whether to allow the request through even if the account is
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expired. If true, Synapse will still require an access token to be
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provided but won't check if the account it belongs to has expired. This
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works thanks to /login delivering access tokens regardless of accounts'
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expiration.
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Returns:
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defer.Deferred: resolves to a ``synapse.types.Requester`` object
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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 = yield 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.hs.config.track_appservice_user_ips:
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yield 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 = yield self.get_user_by_access_token(access_token, rights)
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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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# 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 = yield 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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yield 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, token_id, is_guest, device_id, app_service=app_service
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)
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except KeyError:
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raise MissingClientTokenError()
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@defer.inlineCallbacks
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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 (yield 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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@defer.inlineCallbacks
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def get_user_by_access_token(self, token, rights="access"):
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""" Validate access token and get user_id from it
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Args:
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token (str): The access token to get the user by.
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rights (str): The operation being performed; the access token must
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allow this.
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Returns:
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Deferred[dict]: dict that includes:
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`user` (UserID)
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`is_guest` (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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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 = yield 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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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 = yield 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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"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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"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.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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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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@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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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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"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 defer.succeed(service)
|
|
|
|
def is_server_admin(self, user):
|
|
""" Check if the given user is a local server admin.
|
|
|
|
Args:
|
|
user (UserID): user to check
|
|
|
|
Returns:
|
|
bool: True if the user is an admin
|
|
"""
|
|
return self.store.is_server_admin(user)
|
|
|
|
def compute_auth_events(
|
|
self,
|
|
event,
|
|
current_state_ids: Dict[Tuple[str, str], str],
|
|
for_verification: bool = False,
|
|
):
|
|
"""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:
|
|
defer.Deferred(list[str]): List of event IDs.
|
|
"""
|
|
|
|
if event.type == EventTypes.Create:
|
|
return defer.succeed([])
|
|
|
|
# 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 publically 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 defer.succeed(auth_ids)
|
|
|
|
@defer.inlineCallbacks
|
|
def check_can_change_room_list(self, room_id, user):
|
|
"""Check if the user is allowed to edit the room's entry in the
|
|
published room list.
|
|
|
|
Args:
|
|
room_id (str)
|
|
user (UserID)
|
|
"""
|
|
|
|
is_admin = yield self.is_server_admin(user)
|
|
if is_admin:
|
|
return True
|
|
|
|
user_id = user.to_string()
|
|
yield self.check_joined_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.aliases events
|
|
power_level_event = yield 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.Aliases, "", power_level_event
|
|
)
|
|
user_level = event_auth.get_user_power_level(user_id, auth_events)
|
|
|
|
if user_level < send_level:
|
|
raise AuthError(
|
|
403,
|
|
"This server requires you to be a moderator in the room to"
|
|
" edit its room list entry",
|
|
)
|
|
|
|
@staticmethod
|
|
def has_access_token(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):
|
|
"""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")
|
|
|
|
@defer.inlineCallbacks
|
|
def check_in_room_or_world_readable(self, room_id, user_id):
|
|
"""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.
|
|
|
|
Returns:
|
|
Deferred[tuple[str, str|None]]: 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_was_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 = yield self.check_user_was_in_room(room_id, user_id)
|
|
return member_event.membership, member_event.event_id
|
|
except AuthError:
|
|
visibility = yield 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, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def check_auth_blocking(self, user_id=None, threepid=None, user_type=None):
|
|
"""Checks if the user should be rejected for some external reason,
|
|
such as monthly active user limiting or global disable flag
|
|
|
|
Args:
|
|
user_id(str|None): If present, checks for presence against existing
|
|
MAU cohort
|
|
|
|
threepid(dict|None): If present, checks for presence against configured
|
|
reserved threepid. Used in cases where the user is trying register
|
|
with a MAU blocked server, normally they would be rejected but their
|
|
threepid is on the reserved list. user_id and
|
|
threepid should never be set at the same time.
|
|
|
|
user_type(str|None): If present, is used to decide whether to check against
|
|
certain blocking reasons like MAU.
|
|
"""
|
|
|
|
# Never fail an auth check for the server notices users or support user
|
|
# This can be a problem where event creation is prohibited due to blocking
|
|
if user_id is not None:
|
|
if user_id == self.hs.config.server_notices_mxid:
|
|
return
|
|
if (yield self.store.is_support_user(user_id)):
|
|
return
|
|
|
|
if self.hs.config.hs_disabled:
|
|
raise ResourceLimitError(
|
|
403,
|
|
self.hs.config.hs_disabled_message,
|
|
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
|
|
admin_contact=self.hs.config.admin_contact,
|
|
limit_type=LimitBlockingTypes.HS_DISABLED,
|
|
)
|
|
if self.hs.config.limit_usage_by_mau is True:
|
|
assert not (user_id and threepid)
|
|
|
|
# If the user is already part of the MAU cohort or a trial user
|
|
if user_id:
|
|
timestamp = yield self.store.user_last_seen_monthly_active(user_id)
|
|
if timestamp:
|
|
return
|
|
|
|
is_trial = yield self.store.is_trial_user(user_id)
|
|
if is_trial:
|
|
return
|
|
elif threepid:
|
|
# If the user does not exist yet, but is signing up with a
|
|
# reserved threepid then pass auth check
|
|
if is_threepid_reserved(
|
|
self.hs.config.mau_limits_reserved_threepids, threepid
|
|
):
|
|
return
|
|
elif user_type == UserTypes.SUPPORT:
|
|
# If the user does not exist yet and is of type "support",
|
|
# allow registration. Support users are excluded from MAU checks.
|
|
return
|
|
# Else if there is no room in the MAU bucket, bail
|
|
current_mau = yield self.store.get_monthly_active_count()
|
|
if current_mau >= self.hs.config.max_mau_value:
|
|
raise ResourceLimitError(
|
|
403,
|
|
"Monthly Active User Limit Exceeded",
|
|
admin_contact=self.hs.config.admin_contact,
|
|
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
|
|
limit_type=LimitBlockingTypes.MONTHLY_ACTIVE_USER,
|
|
)
|