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![Erik Johnston](/assets/img/avatar_default.png)
During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
275 lines
10 KiB
Python
275 lines
10 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2023 The Matrix.org Foundation.
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import logging
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from typing import TYPE_CHECKING
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import pymacaroons
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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.http.site import SynapseRequest
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from synapse.logging.opentracing import active_span, force_tracing, start_active_span
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from synapse.types import Requester, create_requester
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from synapse.util.cancellation import cancellable
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from . import GUEST_DEVICE_ID
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from .base import BaseAuth
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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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class InternalAuth(BaseAuth):
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"""
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This class contains functions for authenticating users of our client-server API.
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"""
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def __init__(self, hs: "HomeServer"):
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super().__init__(hs)
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self.clock = hs.get_clock()
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self._account_validity_handler = hs.get_account_validity_handler()
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self._macaroon_generator = hs.get_macaroon_generator()
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self._force_tracing_for_users = hs.config.tracing.force_tracing_for_users
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@cancellable
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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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allow_expired: bool = False,
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allow_locked: 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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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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parent_span = active_span()
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with start_active_span("get_user_by_req"):
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requester = await self._wrapped_get_user_by_req(
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request, allow_guest, allow_expired, allow_locked
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)
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if parent_span:
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if requester.authenticated_entity in self._force_tracing_for_users:
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# request tracing is enabled for this user, so we need to force it
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# tracing on for the parent span (which will be the servlet span).
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#
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# It's too late for the get_user_by_req span to inherit the setting,
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# so we also force it on for that.
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force_tracing()
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force_tracing(parent_span)
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parent_span.set_tag(
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"authenticated_entity", requester.authenticated_entity
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)
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parent_span.set_tag("user_id", requester.user.to_string())
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if requester.device_id is not None:
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parent_span.set_tag("device_id", requester.device_id)
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if requester.app_service is not None:
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parent_span.set_tag("appservice_id", requester.app_service.id)
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return requester
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@cancellable
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async def _wrapped_get_user_by_req(
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self,
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request: SynapseRequest,
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allow_guest: bool,
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allow_expired: bool,
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allow_locked: bool,
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) -> Requester:
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"""Helper for get_user_by_req
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Once get_user_by_req has set up the opentracing span, this does the actual work.
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"""
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try:
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access_token = self.get_access_token_from_request(request)
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# First check if it could be a request from an appservice
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requester = await self.get_appservice_user(request, access_token)
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if not requester:
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# If not, it should be from a regular user
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requester = await self.get_user_by_access_token(
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access_token, allow_expired=allow_expired
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)
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# Deny the request if the user account is locked.
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if not allow_locked and await self.store.get_user_locked_status(
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requester.user.to_string()
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):
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raise AuthError(
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401,
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"User account has been locked",
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errcode=Codes.USER_LOCKED,
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additional_fields={"soft_logout": True},
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)
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# Deny the request if the user account has expired.
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# This check is only done for regular users, not appservice ones.
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if not allow_expired:
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if await self._account_validity_handler.is_user_expired(
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requester.user.to_string()
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):
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# Raise the error if either an account validity module has determined
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# the account has expired, or the legacy account validity
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# implementation is enabled and determined the account has expired
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raise AuthError(
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403,
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"User account has expired",
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errcode=Codes.EXPIRED_ACCOUNT,
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)
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await self._record_request(request, requester)
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if requester.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.requester = requester
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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_user_by_access_token(
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self,
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token: str,
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allow_expired: bool = False,
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) -> Requester:
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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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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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# First look in the database to see if the access token is present
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# as an opaque token.
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user_info = await self.store.get_user_by_access_token(token)
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if user_info:
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valid_until_ms = user_info.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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# Mark the token as used. This is used to invalidate old refresh
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# tokens after some time.
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await self.store.mark_access_token_as_used(user_info.token_id)
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requester = create_requester(
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user_id=user_info.user_id,
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access_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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device_id=user_info.device_id,
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authenticated_entity=user_info.token_owner,
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)
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return requester
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# If the token isn't found in the database, then it could still be a
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# macaroon for a guest, so we check that here.
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try:
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user_id = self._macaroon_generator.verify_guest_token(token)
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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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return create_requester(
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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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authenticated_entity=user_id,
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)
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except (
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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(
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"Invalid access token in auth: %s %s.",
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type(e),
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e,
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)
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raise InvalidClientTokenError("Invalid access token passed.")
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async def is_server_admin(self, requester: Requester) -> bool:
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"""Check if the given user is a local server admin.
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Args:
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requester: The user making the request, according to the access token.
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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(requester.user)
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