mirror of
https://mau.dev/maunium/synapse.git
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9e405034e5
* Trace event persistence When we persist a batch of events, set the parent opentracing span to the that from the request, so that we can trace all the way in. * changelog * When we force tracing, set a baggage item ... so that we can check again later. * Link in both directions between persist_events spans
659 lines
25 KiB
Python
659 lines
25 KiB
Python
# 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 TYPE_CHECKING, Any, Dict, 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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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, HistoryVisibility, 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.appservice import ApplicationService
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from synapse.events import EventBase
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from synapse.http import get_request_user_agent
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from synapse.http.site import SynapseRequest
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from synapse.logging import opentracing as opentracing
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from synapse.storage.databases.main.registration import TokenLookupResult
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from synapse.types import Requester, StateMap, UserID, create_requester
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from synapse.util.caches.lrucache import LruCache
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from synapse.util.macaroons import get_value_from_macaroon, satisfy_expiry
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from synapse.util.metrics import Measure
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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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:
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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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The latter should be moved to synapse.handlers.event_auth.EventAuthHandler.
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"""
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def __init__(self, hs: "HomeServer"):
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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(
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10000, "token_cache"
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) # type: LruCache[str, Tuple[str, bool]]
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self._auth_blocking = AuthBlocking(self.hs)
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self._account_validity_enabled = (
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hs.config.account_validity.account_validity_enabled
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)
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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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self._force_tracing_for_users = hs.config.tracing.force_tracing_for_users
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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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) -> None:
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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_by_id = 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_by_id.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: str, host: str) -> bool:
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with Measure(self.clock, "check_host_in_room"):
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return await self.store.is_host_joined(room_id, host)
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def get_public_keys(self, invite_event: EventBase) -> List[Dict[str, Any]]:
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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: SynapseRequest,
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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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) -> 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 = request.getClientIP()
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user_agent = get_request_user_agent(request)
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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 and app_service:
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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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requester = create_requester(user_id, app_service=app_service)
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request.requester = user_id
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if user_id in self._force_tracing_for_users:
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opentracing.force_tracing()
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opentracing.set_tag("authenticated_entity", user_id)
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opentracing.set_tag("user_id", user_id)
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opentracing.set_tag("appservice_id", app_service.id)
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return requester
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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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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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if await self.store.is_account_expired(
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user_info.user_id, self.clock.time_msec()
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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 = user_info.device_id
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if access_token and ip_addr:
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await self.store.insert_client_ip(
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user_id=user_info.token_owner,
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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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requester = create_requester(
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user_info.user_id,
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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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authenticated_entity=user_info.token_owner,
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)
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request.requester = requester
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if user_info.token_owner in self._force_tracing_for_users:
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opentracing.force_tracing()
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opentracing.set_tag("authenticated_entity", user_info.token_owner)
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opentracing.set_tag("user_id", user_info.user_id)
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if device_id:
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opentracing.set_tag("device_id", device_id)
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return requester
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except KeyError:
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raise MissingClientTokenError()
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async def _get_appservice_user_id(
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self, request: Request
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) -> Tuple[Optional[str], Optional[ApplicationService]]:
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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(request.getClientIP())
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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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# This will always be set by the time Twisted calls us.
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assert request.args is not 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,
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token: str,
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rights: str = "access",
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allow_expired: bool = False,
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) -> TokenLookupResult:
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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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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.store.get_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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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 = TokenLookupResult(
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user_id=user_id,
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is_guest=True,
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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 = TokenLookupResult(user_id=user_id, is_guest=False)
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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(
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self, token: str, rights: str = "access"
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) -> Tuple[str, bool]:
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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 = get_value_from_macaroon(macaroon, "user_id")
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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 (
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pymacaroons.exceptions.MacaroonException,
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KeyError,
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TypeError,
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ValueError,
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):
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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 validate_macaroon(
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self, macaroon: pymacaroons.Macaroon, type_string: str, user_id: str
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) -> None:
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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: The macaroon to validate
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type_string: The kind of token required (e.g. "access", "delete_pusher")
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user_id: 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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satisfy_expiry(v, self.clock.time_msec)
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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 get_appservice_by_req(self, request: SynapseRequest) -> ApplicationService:
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token = self.get_access_token_from_request(request)
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service = self.store.get_app_service_by_token(token)
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if not service:
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logger.warning("Unrecognised appservice access token.")
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raise InvalidClientTokenError()
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request.requester = create_requester(service.sender, app_service=service)
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return service
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async def is_server_admin(self, user: UserID) -> bool:
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"""Check if the given user is a local server admin.
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Args:
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user: user to check
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Returns:
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True if the user is an admin
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"""
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return await self.store.is_server_admin(user)
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def compute_auth_events(
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self,
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event,
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current_state_ids: StateMap[str],
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for_verification: bool = False,
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) -> List[str]:
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"""Given an event and current state return the list of event IDs used
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to auth an event.
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If `for_verification` is False then only return auth events that
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should be added to the event's `auth_events`.
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Returns:
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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) -> bool:
|
|
"""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) -> bool:
|
|
"""Checks if the request has an access_token.
|
|
|
|
Returns:
|
|
False if no access_token was given, True otherwise.
|
|
"""
|
|
# This will always be set by the time Twisted calls us.
|
|
assert request.args is not None
|
|
|
|
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) -> str:
|
|
"""Extracts the access_token from the request.
|
|
|
|
Args:
|
|
request: The http request.
|
|
Returns:
|
|
The access_token
|
|
Raises:
|
|
MissingClientTokenError: If there isn't a single access_token in the
|
|
request
|
|
"""
|
|
# This will always be set by the time Twisted calls us.
|
|
assert request.args is not None
|
|
|
|
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.get("history_visibility")
|
|
== HistoryVisibility.WORLD_READABLE
|
|
):
|
|
return Membership.JOIN, None
|
|
raise AuthError(
|
|
403,
|
|
"User %s not in room %s, and room previews are disabled"
|
|
% (user_id, room_id),
|
|
)
|
|
|
|
async def check_auth_blocking(self, *args, **kwargs) -> None:
|
|
await self._auth_blocking.check_auth_blocking(*args, **kwargs)
|