From 8d08cf75f4324cf142c2969c72b10b16ae438b78 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Wed, 21 Oct 2020 15:31:28 +0100 Subject: [PATCH] Add admin API for logging in as a user Fixes #6054. --- docs/admin_api/user_admin_api.rst | 35 ++++ synapse/handlers/auth.py | 24 ++- synapse/rest/admin/__init__.py | 2 + synapse/rest/admin/users.py | 43 ++++ .../storage/databases/main/registration.py | 2 + tests/rest/admin/test_user.py | 192 +++++++++++++++++- 6 files changed, 292 insertions(+), 6 deletions(-) diff --git a/docs/admin_api/user_admin_api.rst b/docs/admin_api/user_admin_api.rst index 7ca902faba25..6d7e9a50fece 100644 --- a/docs/admin_api/user_admin_api.rst +++ b/docs/admin_api/user_admin_api.rst @@ -341,6 +341,41 @@ The following fields are returned in the JSON response body: - ``total`` - Number of rooms. +Login as a user +=============== + +Get an access token that can be used to authenticate as that user. Useful for +when admins wish to do actions on behalf of a user. + +The API is:: + + PUT /_synapse/admin/v1/users//login + {} + +An optional ``valid_until_ms`` field can be specified in the request body as an +integer timestamp that specifies when the token should expire. By default tokens +do not expire. + +A response body like the following is returned: + +.. code:: json + + { + "access_token": "" + } + + +This API does *not* generate a new device for the user, and so will not appear +their ``/devices`` list, and in general the target user should not be able to +tell they have been logged in as. + +To expire the token call the standard ``/logout`` API with the token. + +Note: The token will expire if the *admin* user calls ``/logout/all`` from any +of their devices, but the token will *not* expire if the target user does the +same. + + User devices ============ diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py index 70c95361f18c..6d5abc85e11b 100644 --- a/synapse/handlers/auth.py +++ b/synapse/handlers/auth.py @@ -686,8 +686,12 @@ def _auth_dict_for_flows( } async def get_access_token_for_user_id( - self, user_id: str, device_id: Optional[str], valid_until_ms: Optional[int] - ): + self, + user_id: str, + device_id: Optional[str], + valid_until_ms: Optional[int], + puppets_user_id: Optional[str] = None, + ) -> str: """ Creates a new access token for the user with the given user ID. @@ -713,13 +717,25 @@ async def get_access_token_for_user_id( fmt_expiry = time.strftime( " until %Y-%m-%d %H:%M:%S", time.localtime(valid_until_ms / 1000.0) ) - logger.info("Logging in user %s on device %s%s", user_id, device_id, fmt_expiry) + + if puppets_user_id: + logger.info( + "Logging in user %s as %s%s", user_id, puppets_user_id, fmt_expiry + ) + else: + logger.info( + "Logging in user %s on device %s%s", user_id, device_id, fmt_expiry + ) await self.auth.check_auth_blocking(user_id) access_token = self.macaroon_gen.generate_access_token(user_id) await self.store.add_access_token_to_user( - user_id, access_token, device_id, valid_until_ms + user_id=user_id, + token=access_token, + device_id=device_id, + valid_until_ms=valid_until_ms, + puppets_user_id=puppets_user_id, ) # the device *should* have been registered before we got here; however, diff --git a/synapse/rest/admin/__init__.py b/synapse/rest/admin/__init__.py index 789431ef25b2..b920d0dd6c87 100644 --- a/synapse/rest/admin/__init__.py +++ b/synapse/rest/admin/__init__.py @@ -55,6 +55,7 @@ UserRestServletV2, UsersRestServlet, UsersRestServletV2, + UserTokenRestServlet, WhoisRestServlet, ) from synapse.types import RoomStreamToken @@ -216,6 +217,7 @@ def register_servlets(hs, http_server): VersionServlet(hs).register(http_server) UserAdminServlet(hs).register(http_server) UserMembershipRestServlet(hs).register(http_server) + UserTokenRestServlet(hs).register(http_server) UserRestServletV2(hs).register(http_server) UsersRestServletV2(hs).register(http_server) DeviceRestServlet(hs).register(http_server) diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py index 8efefbc0a03a..2d8d963062fa 100644 --- a/synapse/rest/admin/users.py +++ b/synapse/rest/admin/users.py @@ -16,6 +16,7 @@ import hmac import logging from http import HTTPStatus +from typing import TYPE_CHECKING from synapse.api.constants import UserTypes from synapse.api.errors import Codes, NotFoundError, SynapseError @@ -35,6 +36,9 @@ ) from synapse.types import UserID +if TYPE_CHECKING: + from synapse.server import HomeServer + logger = logging.getLogger(__name__) @@ -708,3 +712,42 @@ async def on_GET(self, request, user_id): ret = {"joined_rooms": list(room_ids), "total": len(room_ids)} return 200, ret + + +class UserTokenRestServlet(RestServlet): + """An admin API for logging in as a user. + """ + + PATTERNS = admin_patterns("/users/(?P[^/]*)/login$") + + def __init__(self, hs: "HomeServer"): + self.hs = hs + self.store = hs.get_datastore() + self.auth = hs.get_auth() + self.auth_handler = hs.get_auth_handler() + + async def on_PUT(self, request, user_id): + requester = await self.auth.get_user_by_req(request) + await assert_user_is_admin(self.auth, requester.user) + auth_user = requester.user + + if not self.hs.is_mine_id(user_id): + raise SynapseError(400, "Only local users can be logged in as") + + body = parse_json_object_from_request(request) + + valid_until_ms = body.get("valid_until_ms") + if valid_until_ms and not isinstance(valid_until_ms, int): + raise SynapseError(400, "'valid_until_ms' parameter must be an int") + + if auth_user.to_string() == user_id: + raise SynapseError(400, "Cannot use admin API to login as self") + + token = await self.auth_handler.get_access_token_for_user_id( + user_id=auth_user.to_string(), + device_id=None, + valid_until_ms=valid_until_ms, + puppets_user_id=user_id, + ) + + return 200, {"access_token": token} diff --git a/synapse/storage/databases/main/registration.py b/synapse/storage/databases/main/registration.py index c4c2fa4f68f1..545d34f72a18 100644 --- a/synapse/storage/databases/main/registration.py +++ b/synapse/storage/databases/main/registration.py @@ -1101,6 +1101,7 @@ async def add_access_token_to_user( token: str, device_id: Optional[str], valid_until_ms: Optional[int], + puppets_user_id: Optional[str] = None, ) -> int: """Adds an access token for the given user. @@ -1124,6 +1125,7 @@ async def add_access_token_to_user( "token": token, "device_id": device_id, "valid_until_ms": valid_until_ms, + "puppets_user_id": puppets_user_id, }, desc="add_access_token_to_user", ) diff --git a/tests/rest/admin/test_user.py b/tests/rest/admin/test_user.py index 98d062373497..3aa7414787c1 100644 --- a/tests/rest/admin/test_user.py +++ b/tests/rest/admin/test_user.py @@ -23,8 +23,8 @@ import synapse.rest.admin from synapse.api.constants import UserTypes from synapse.api.errors import Codes, HttpResponseException, ResourceLimitError -from synapse.rest.client.v1 import login, room -from synapse.rest.client.v2_alpha import sync +from synapse.rest.client.v1 import login, logout, room +from synapse.rest.client.v2_alpha import devices, sync from tests import unittest from tests.test_utils import make_awaitable @@ -1101,3 +1101,191 @@ def test_get_rooms(self): self.assertEqual(200, channel.code, msg=channel.json_body) self.assertEqual(number_rooms, channel.json_body["total"]) self.assertEqual(number_rooms, len(channel.json_body["joined_rooms"])) + + +class UserTokenRestTestCase(unittest.HomeserverTestCase): + """Test for /_synapse/admin/v1/users//login + """ + + servlets = [ + synapse.rest.admin.register_servlets, + login.register_servlets, + sync.register_servlets, + room.register_servlets, + devices.register_servlets, + logout.register_servlets, + ] + + def prepare(self, reactor, clock, hs): + self.store = hs.get_datastore() + + self.admin_user = self.register_user("admin", "pass", admin=True) + self.admin_user_tok = self.login("admin", "pass") + + self.other_user = self.register_user("user", "pass") + self.other_user_tok = self.login("user", "pass") + self.url = "/_synapse/admin/v1/users/%s/login" % urllib.parse.quote( + self.other_user + ) + + def _get_token(self) -> str: + request, channel = self.make_request( + "PUT", self.url, b"{}", access_token=self.admin_user_tok + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + return channel.json_body["access_token"] + + def test_no_auth(self): + """Try to login as a user without authentication. + """ + request, channel = self.make_request("PUT", self.url, b"{}") + self.render(request) + + self.assertEqual(401, int(channel.result["code"]), msg=channel.result["body"]) + self.assertEqual(Codes.MISSING_TOKEN, channel.json_body["errcode"]) + + def test_not_admin(self): + """Try to login as a user as a non-admin user. + """ + request, channel = self.make_request( + "PUT", self.url, b"{}", access_token=self.other_user_tok + ) + self.render(request) + + self.assertEqual(403, int(channel.result["code"]), msg=channel.result["body"]) + + def test_send_event(self): + """Test that sending event as a user works. + """ + # Create a room. + room_id = self.helper.create_room_as(self.other_user, tok=self.other_user_tok) + + # Login in as the user + puppet_token = self._get_token() + + # Test that sending works, and generates the event as the right user. + resp = self.helper.send_event(room_id, "com.example.test", tok=puppet_token) + event_id = resp["event_id"] + event = self.get_success(self.store.get_event(event_id)) + self.assertEqual(event.sender, self.other_user) + + def test_devices(self): + """Tests that logging in as a user doesn't create a new device for them. + """ + # Login in as the user + self._get_token() + + # Check that we don't see a new device in our devices list + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=self.other_user_tok + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # We should only see the one device (from the login in `prepare`) + self.assertEqual(len(channel.json_body["devices"]), 1) + + def test_logout(self): + """Test that calling `/logout` with the token works. + """ + # Login in as the user + puppet_token = self._get_token() + + # Test that we can successfully make a request + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=puppet_token + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # Logout with the puppet token + request, channel = self.make_request( + "POST", "logout", b"{}", access_token=puppet_token + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # The puppet token should no longer work + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=puppet_token + ) + self.render(request) + self.assertEqual(401, int(channel.result["code"]), msg=channel.result["body"]) + + # .. but the real user's tokens should still work + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=self.other_user_tok + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + def test_user_logout_all(self): + """Tests that the target user calling `/logout/all` does *not* expire + the token. + """ + # Login in as the user + puppet_token = self._get_token() + + # Test that we can successfully make a request + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=puppet_token + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # Logout all with the real user token + request, channel = self.make_request( + "POST", "logout/all", b"{}", access_token=self.other_user_tok + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # The puppet token should still work + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=puppet_token + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # .. but the real user's tokens shouldn't + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=self.other_user_tok + ) + self.render(request) + self.assertEqual(401, int(channel.result["code"]), msg=channel.result["body"]) + + def test_admin_logout_all(self): + """Tests that the admin user calling `/logout/all` does expire the + token. + """ + # Login in as the user + puppet_token = self._get_token() + + # Test that we can successfully make a request + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=puppet_token + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # Logout all with the admin user token + request, channel = self.make_request( + "POST", "logout/all", b"{}", access_token=self.admin_user_tok + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"]) + + # The puppet token should no longer work + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=puppet_token + ) + self.render(request) + self.assertEqual(401, int(channel.result["code"]), msg=channel.result["body"]) + + # .. but the real user's tokens should still work + request, channel = self.make_request( + "GET", "devices", b"{}", access_token=self.other_user_tok + ) + self.render(request) + self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])