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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
from typing import TYPE_CHECKING, Tuple
from synapse.api.ratelimiting import Ratelimiter
from synapse.config.ratelimiting import RatelimitSettings
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_json_object_from_request
from synapse.http.site import SynapseRequest
from synapse.rest.client._base import client_patterns, interactive_auth_handler
from synapse.types import JsonDict
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class LoginTokenRequestServlet(RestServlet):
"""
Get a token that can be used with `m.login.token` to log in a second device.
Request:
POST /login/get_token HTTP/1.1
Content-Type: application/json
{}
Response:
HTTP/1.1 200 OK
{
"login_token": "ABDEFGH",
"expires_in_ms": 3600000,
}
"""
PATTERNS = [
*client_patterns(
"/login/get_token$", releases=["v1"], v1=False, unstable=False
),
# TODO: this is no longer needed once unstable MSC3882 does not need to be supported:
*client_patterns(
"/org.matrix.msc3882/login/token$", releases=[], v1=False, unstable=True
),
]
def __init__(self, hs: "HomeServer"):
super().__init__()
self.auth = hs.get_auth()
self._main_store = hs.get_datastores().main
self.auth_handler = hs.get_auth_handler()
self.token_timeout = hs.config.auth.login_via_existing_token_timeout
self._require_ui_auth = hs.config.auth.login_via_existing_require_ui_auth
# Ratelimit aggressively to a maximum of 1 request per minute.
#
# This endpoint can be used to spawn additional sessions and could be
# abused by a malicious client to create many sessions.
self._ratelimiter = Ratelimiter(
store=self._main_store,
clock=hs.get_clock(),
cfg=RatelimitSettings(
key="<login token request>",
per_second=1 / 60,
burst_count=1,
),
)
@interactive_auth_handler
async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
requester = await self.auth.get_user_by_req(request)
body = parse_json_object_from_request(request)
if self._require_ui_auth:
await self.auth_handler.validate_user_via_ui_auth(
requester,
request,
body,
"issue a new access token for your account",
can_skip_ui_auth=False, # Don't allow skipping of UI auth
)
# Ensure that this endpoint isn't being used too often. (Ensure this is
# done *after* UI auth.)
await self._ratelimiter.ratelimit(None, requester.user.to_string().lower())
login_token = await self.auth_handler.create_login_token_for_user_id(
user_id=requester.user.to_string(),
duration_ms=self.token_timeout,
)
return (
200,
{
"login_token": login_token,
# TODO: this is no longer needed once unstable MSC3882 does not need to be supported:
"expires_in": self.token_timeout // 1000,
"expires_in_ms": self.token_timeout,
},
)
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
if hs.config.auth.login_via_existing_enabled:
LoginTokenRequestServlet(hs).register(http_server)
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