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Revert MSC3861 introspection cache, admin impersonation and account lock (#16258)

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Quentin Gliech 2023-09-06 16:19:51 +02:00 committed by GitHub
parent 1cd0715a0f
commit 1940d990a3
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10 changed files with 31 additions and 391 deletions
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1
changelog.d/16258.bugfix Normal file
View file

@ -0,0 +1 @@
Revert MSC3861 introspection cache, admin impersonation and account lock.

91
synapse/api/auth/msc3861_delegated.py
View file

@ -28,7 +28,6 @@ from twisted.web.http_headers import Headers
from synapse.api.auth.base import BaseAuth
from synapse.api.errors import (
AuthError,
Codes,
HttpResponseException,
InvalidClientTokenError,
OAuthInsufficientScopeError,
@ -40,7 +39,6 @@ from synapse.logging.context import make_deferred_yieldable
from synapse.types import Requester, UserID, create_requester
from synapse.util import json_decoder
from synapse.util.caches.cached_call import RetryOnExceptionCachedCall
from synapse.util.caches.expiringcache import ExpiringCache
if TYPE_CHECKING:
from synapse.server import HomeServer
@ -109,20 +107,13 @@ class MSC3861DelegatedAuth(BaseAuth):
assert self._config.client_id, "No client_id provided"
assert auth_method is not None, "Invalid client_auth_method provided"
self._clock = hs.get_clock()
self._http_client = hs.get_proxied_http_client()
self._hostname = hs.hostname
self._admin_token = self._config.admin_token
self._issuer_metadata = RetryOnExceptionCachedCall(self._load_metadata)
self._clock = hs.get_clock()
self._token_cache: ExpiringCache[str, IntrospectionToken] = ExpiringCache(
cache_name="introspection_token_cache",
clock=self._clock,
max_len=10000,
expiry_ms=5 * 60 * 1000,
)
if isinstance(auth_method, PrivateKeyJWTWithKid):
# Use the JWK as the client secret when using the private_key_jwt method
assert self._config.jwk, "No JWK provided"
@ -161,20 +152,6 @@ class MSC3861DelegatedAuth(BaseAuth):
Returns:
The introspection response
"""
# check the cache before doing a request
introspection_token = self._token_cache.get(token, None)
if introspection_token:
# check the expiration field of the token (if it exists)
exp = introspection_token.get("exp", None)
if exp:
time_now = self._clock.time()
expired = time_now > exp
if not expired:
return introspection_token
else:
return introspection_token
metadata = await self._issuer_metadata.get()
introspection_endpoint = metadata.get("introspection_endpoint")
raw_headers: Dict[str, str] = {
@ -188,10 +165,7 @@ class MSC3861DelegatedAuth(BaseAuth):
# Fill the body/headers with credentials
uri, raw_headers, body = self._client_auth.prepare(
method="POST",
uri=introspection_endpoint,
headers=raw_headers,
body=body,
method="POST", uri=introspection_endpoint, headers=raw_headers, body=body
)
headers = Headers({k: [v] for (k, v) in raw_headers.items()})
@ -233,20 +207,10 @@ class MSC3861DelegatedAuth(BaseAuth):
"The introspection endpoint returned an invalid JSON response."
)
expiration = resp.get("exp", None)
if expiration:
if self._clock.time() > expiration:
raise InvalidClientTokenError("Token is expired.")
introspection_token = IntrospectionToken(**resp)
# add token to cache
self._token_cache[token] = introspection_token
return introspection_token
return IntrospectionToken(**resp)
async def is_server_admin(self, requester: Requester) -> bool:
return SCOPE_SYNAPSE_ADMIN in requester.scope
return "urn:synapse:admin:*" in requester.scope
async def get_user_by_req(
self,
@ -263,36 +227,6 @@ class MSC3861DelegatedAuth(BaseAuth):
# so that we don't provision the user if they don't have enough permission:
requester = await self.get_user_by_access_token(access_token, allow_expired)
# Allow impersonation by an admin user using `_oidc_admin_impersonate_user_id` query parameter
if request.args is not None:
user_id_params = request.args.get(b"_oidc_admin_impersonate_user_id")
if user_id_params:
if await self.is_server_admin(requester):
user_id_str = user_id_params[0].decode("ascii")
impersonated_user_id = UserID.from_string(user_id_str)
logging.info(f"Admin impersonation of user {user_id_str}")
requester = create_requester(
user_id=impersonated_user_id,
scope=[SCOPE_MATRIX_API],
authenticated_entity=requester.user.to_string(),
)
else:
raise AuthError(
401,
"Impersonation not possible by a non admin user",
)
# Deny the request if the user account is locked.
if not allow_locked and await self.store.get_user_locked_status(
requester.user.to_string()
):
raise AuthError(
401,
"User account has been locked",
errcode=Codes.USER_LOCKED,
additional_fields={"soft_logout": True},
)
if not allow_guest and requester.is_guest:
raise OAuthInsufficientScopeError([SCOPE_MATRIX_API])
@ -309,14 +243,14 @@ class MSC3861DelegatedAuth(BaseAuth):
# XXX: This is a temporary solution so that the admin API can be called by
# the OIDC provider. This will be removed once we have OIDC client
# credentials grant support in matrix-authentication-service.
logging.info("Admin token used")
logging.info("Admin toked used")
# XXX: that user doesn't exist and won't be provisioned.
# This is mostly fine for admin calls, but we should also think about doing
# requesters without a user_id.
admin_user = UserID("__oidc_admin", self._hostname)
return create_requester(
user_id=admin_user,
scope=[SCOPE_SYNAPSE_ADMIN],
scope=["urn:synapse:admin:*"],
)
try:
@ -438,16 +372,3 @@ class MSC3861DelegatedAuth(BaseAuth):
scope=scope,
is_guest=(has_guest_scope and not has_user_scope),
)
def invalidate_cached_tokens(self, keys: List[str]) -> None:
"""
Invalidate the entry(s) in the introspection token cache corresponding to the given key
"""
for key in keys:
self._token_cache.invalidate(key)
def invalidate_token_cache(self) -> None:
"""
Invalidate the entire token cache.
"""
self._token_cache.invalidate_all()

12
synapse/replication/tcp/client.py
View file

@ -28,7 +28,6 @@ from synapse.logging.context import PreserveLoggingContext, make_deferred_yielda
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.replication.tcp.streams import (
AccountDataStream,
CachesStream,
DeviceListsStream,
PushersStream,
PushRulesStream,
@ -76,7 +75,6 @@ class ReplicationDataHandler:
self._instance_name = hs.get_instance_name()
self._typing_handler = hs.get_typing_handler()
self._state_storage_controller = hs.get_storage_controllers().state
self.auth = hs.get_auth()
self._notify_pushers = hs.config.worker.start_pushers
self._pusher_pool = hs.get_pusherpool()
@ -224,16 +222,6 @@ class ReplicationDataHandler:
self._state_storage_controller.notify_event_un_partial_stated(
row.event_id
)
# invalidate the introspection token cache
elif stream_name == CachesStream.NAME:
for row in rows:
if row.cache_func == "introspection_token_invalidation":
if row.keys[0] is None:
# invalidate the whole cache
# mypy ignore - the token cache is defined on MSC3861DelegatedAuth
self.auth.invalidate_token_cache() # type: ignore[attr-defined]
else:
self.auth.invalidate_cached_tokens(row.keys) # type: ignore[attr-defined]
await self._presence_handler.process_replication_rows(
stream_name, instance_name, token, rows

3
synapse/rest/admin/__init__.py
View file

@ -47,7 +47,6 @@ from synapse.rest.admin.federation import (
ListDestinationsRestServlet,
)
from synapse.rest.admin.media import ListMediaInRoom, register_servlets_for_media_repo
from synapse.rest.admin.oidc import OIDCTokenRevocationRestServlet
from synapse.rest.admin.registration_tokens import (
ListRegistrationTokensRestServlet,
NewRegistrationTokenRestServlet,
@ -298,8 +297,6 @@ def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
BackgroundUpdateRestServlet(hs).register(http_server)
BackgroundUpdateStartJobRestServlet(hs).register(http_server)
ExperimentalFeaturesRestServlet(hs).register(http_server)
if hs.config.experimental.msc3861.enabled:
OIDCTokenRevocationRestServlet(hs).register(http_server)
def register_servlets_for_client_rest_resource(

55
synapse/rest/admin/oidc.py
View file

@ -1,55 +0,0 @@
# Copyright 2023 The Matrix.org Foundation C.I.C
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from http import HTTPStatus
from typing import TYPE_CHECKING, Dict, Tuple
from synapse.http.servlet import RestServlet
from synapse.http.site import SynapseRequest
from synapse.rest.admin._base import admin_patterns, assert_requester_is_admin
if TYPE_CHECKING:
from synapse.server import HomeServer
class OIDCTokenRevocationRestServlet(RestServlet):
"""
Delete a given token introspection response - identified by the `jti` field - from the
introspection token cache when a token is revoked at the authorizing server
"""
PATTERNS = admin_patterns("/OIDC_token_revocation/(?P<token_id>[^/]*)")
def __init__(self, hs: "HomeServer"):
super().__init__()
auth = hs.get_auth()
# If this endpoint is loaded then we must have enabled delegated auth.
from synapse.api.auth.msc3861_delegated import MSC3861DelegatedAuth
assert isinstance(auth, MSC3861DelegatedAuth)
self.auth = auth
self.store = hs.get_datastores().main
async def on_DELETE(
self, request: SynapseRequest, token_id: str
) -> Tuple[HTTPStatus, Dict]:
await assert_requester_is_admin(self.auth, request)
self.auth._token_cache.invalidate(token_id)
# make sure we invalidate the cache on any workers
await self.store.stream_introspection_token_invalidation((token_id,))
return HTTPStatus.OK, {}

13
synapse/storage/databases/main/cache.py
View file

@ -584,19 +584,6 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
else:
return 0
async def stream_introspection_token_invalidation(
self, key: Tuple[Optional[str]]
) -> None:
"""
Stream an invalidation request for the introspection token cache to workers
Args:
key: token_id of the introspection token to remove from the cache
"""
await self.send_invalidation_to_replication(
"introspection_token_invalidation", key
)
@wrap_as_background_process("clean_up_old_cache_invalidations")
async def _clean_up_cache_invalidation_wrapper(self) -> None:
"""

9
synapse/storage/databases/main/devices.py
View file

@ -33,7 +33,6 @@ from typing_extensions import Literal
from synapse.api.constants import EduTypes
from synapse.api.errors import Codes, StoreError
from synapse.config.homeserver import HomeServerConfig
from synapse.logging.opentracing import (
get_active_span_text_map,
set_tag,
@ -1664,7 +1663,6 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
self.device_id_exists_cache: LruCache[
Tuple[str, str], Literal[True]
] = LruCache(cache_name="device_id_exists", max_size=10000)
self.config: HomeServerConfig = hs.config
async def store_device(
self,
@ -1786,13 +1784,6 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
for device_id in device_ids:
self.device_id_exists_cache.invalidate((user_id, device_id))
# TODO: don't nuke the entire cache once there is a way to associate
# device_id -> introspection_token
if self.config.experimental.msc3861.enabled:
# mypy ignore - the token cache is defined on MSC3861DelegatedAuth
self.auth._token_cache.invalidate_all() # type: ignore[attr-defined]
await self.stream_introspection_token_invalidation((None,))
async def update_device(
self, user_id: str, device_id: str, new_display_name: Optional[str] = None
) -> None:

22
synapse/util/caches/expiringcache.py
View file

@ -140,20 +140,6 @@ class ExpiringCache(Generic[KT, VT]):
return value.value
def invalidate(self, key: KT) -> None:
"""
Remove the given key from the cache.
"""
value = self._cache.pop(key, None)
if value:
if self.iterable:
self.metrics.inc_evictions(
EvictionReason.invalidation, len(value.value)
)
else:
self.metrics.inc_evictions(EvictionReason.invalidation)
def __contains__(self, key: KT) -> bool:
return key in self._cache
@ -207,14 +193,6 @@ class ExpiringCache(Generic[KT, VT]):
len(self),
)
def invalidate_all(self) -> None:
"""
Remove all items from the cache.
"""
keys = set(self._cache.keys())
for key in keys:
self._cache.pop(key)
def __len__(self) -> int:
if self.iterable:
return sum(len(entry.value) for entry in self._cache.values())

154
tests/handlers/test_oauth_delegation.py
View file

@ -14,7 +14,7 @@
from http import HTTPStatus
from typing import Any, Dict, Union
from unittest.mock import ANY, AsyncMock, Mock
from unittest.mock import ANY, Mock
from urllib.parse import parse_qs
from signedjson.key import (
@ -122,6 +122,7 @@ class MSC3861OAuthDelegation(HomeserverTestCase):
"client_id": CLIENT_ID,
"client_auth_method": "client_secret_post",
"client_secret": CLIENT_SECRET,
"admin_token": "admin_token_value",
}
}
return config
@ -340,41 +341,6 @@ class MSC3861OAuthDelegation(HomeserverTestCase):
get_awaitable_result(self.auth.is_server_admin(requester)), False
)
def test_active_user_admin_impersonation(self) -> None:
"""The handler should return a requester with normal user rights
and an user ID matching the one specified in query param `user_id`"""
self.http_client.request = simple_async_mock(
return_value=FakeResponse.json(
code=200,
payload={
"active": True,
"sub": SUBJECT,
"scope": " ".join([SYNAPSE_ADMIN_SCOPE, MATRIX_USER_SCOPE]),
"username": USERNAME,
},
)
)
request = Mock(args={})
request.args[b"access_token"] = [b"mockAccessToken"]
impersonated_user_id = f"@{USERNAME}:{SERVER_NAME}"
request.args[b"_oidc_admin_impersonate_user_id"] = [
impersonated_user_id.encode("ascii")
]
request.requestHeaders.getRawHeaders = mock_getRawHeaders()
requester = self.get_success(self.auth.get_user_by_req(request))
self.http_client.get_json.assert_called_once_with(WELL_KNOWN)
self.http_client.request.assert_called_once_with(
method="POST", uri=INTROSPECTION_ENDPOINT, data=ANY, headers=ANY
)
self._assertParams()
self.assertEqual(requester.user.to_string(), impersonated_user_id)
self.assertEqual(requester.is_guest, False)
self.assertEqual(requester.device_id, None)
self.assertEqual(
get_awaitable_result(self.auth.is_server_admin(requester)), False
)
def test_active_user_with_device(self) -> None:
"""The handler should return a requester with normal user rights and a device ID."""
@ -526,100 +492,6 @@ class MSC3861OAuthDelegation(HomeserverTestCase):
error = self.get_failure(self.auth.get_user_by_req(request), SynapseError)
self.assertEqual(error.value.code, 503)
def test_introspection_token_cache(self) -> None:
access_token = "open_sesame"
self.http_client.request = simple_async_mock(
return_value=FakeResponse.json(
code=200,
payload={"active": "true", "scope": "guest", "jti": access_token},
)
)
# first call should cache response
# Mpyp ignores below are due to mypy not understanding the dynamic substitution of msc3861 auth code
# for regular auth code via the config
self.get_success(
self.auth._introspect_token(access_token) # type: ignore[attr-defined]
)
introspection_token = self.auth._token_cache.get(access_token) # type: ignore[attr-defined]
self.assertEqual(introspection_token["jti"], access_token)
# there's been one http request
self.http_client.request.assert_called_once()
# second call should pull from cache, there should still be only one http request
token = self.get_success(self.auth._introspect_token(access_token)) # type: ignore[attr-defined]
self.http_client.request.assert_called_once()
self.assertEqual(token["jti"], access_token)
# advance past five minutes and check that cache expired - there should be more than one http call now
self.reactor.advance(360)
token_2 = self.get_success(self.auth._introspect_token(access_token)) # type: ignore[attr-defined]
self.assertEqual(self.http_client.request.call_count, 2)
self.assertEqual(token_2["jti"], access_token)
# test that if a cached token is expired, a fresh token will be pulled from authorizing server - first add a
# token with a soon-to-expire `exp` field to the cache
self.http_client.request = simple_async_mock(
return_value=FakeResponse.json(
code=200,
payload={
"active": "true",
"scope": "guest",
"jti": "stale",
"exp": self.clock.time() + 100,
},
)
)
self.get_success(
self.auth._introspect_token("stale") # type: ignore[attr-defined]
)
introspection_token = self.auth._token_cache.get("stale") # type: ignore[attr-defined]
self.assertEqual(introspection_token["jti"], "stale")
self.assertEqual(self.http_client.request.call_count, 1)
# advance the reactor past the token expiry but less than the cache expiry
self.reactor.advance(120)
self.assertEqual(self.auth._token_cache.get("stale"), introspection_token) # type: ignore[attr-defined]
# check that the next call causes another http request (which will fail because the token is technically expired
# but the important thing is we discard the token from the cache and try the network)
self.get_failure(
self.auth._introspect_token("stale"), InvalidClientTokenError # type: ignore[attr-defined]
)
self.assertEqual(self.http_client.request.call_count, 2)
def test_revocation_endpoint(self) -> None:
# mock introspection response and then admin verification response
self.http_client.request = AsyncMock(
side_effect=[
FakeResponse.json(
code=200, payload={"active": True, "jti": "open_sesame"}
),
FakeResponse.json(
code=200,
payload={
"active": True,
"sub": SUBJECT,
"scope": " ".join([SYNAPSE_ADMIN_SCOPE, MATRIX_USER_SCOPE]),
"username": USERNAME,
},
),
]
)
# cache a token to delete
introspection_token = self.get_success(
self.auth._introspect_token("open_sesame") # type: ignore[attr-defined]
)
self.assertEqual(self.auth._token_cache.get("open_sesame"), introspection_token) # type: ignore[attr-defined]
# delete the revoked token
introspection_token_id = "open_sesame"
url = f"/_synapse/admin/v1/OIDC_token_revocation/{introspection_token_id}"
channel = self.make_request("DELETE", url, access_token="mockAccessToken")
self.assertEqual(channel.code, 200)
self.assertEqual(self.auth._token_cache.get("open_sesame"), None) # type: ignore[attr-defined]
def make_device_keys(self, user_id: str, device_id: str) -> JsonDict:
# We only generate a master key to simplify the test.
master_signing_key = generate_signing_key(device_id)
@ -791,3 +663,25 @@ class MSC3861OAuthDelegation(HomeserverTestCase):
self.expect_unrecognized("GET", "/_synapse/admin/v1/users/foo/admin")
self.expect_unrecognized("PUT", "/_synapse/admin/v1/users/foo/admin")
self.expect_unrecognized("POST", "/_synapse/admin/v1/account_validity/validity")
def test_admin_token(self) -> None:
"""The handler should return a requester with admin rights when admin_token is used."""
self.http_client.request = simple_async_mock(
return_value=FakeResponse.json(code=200, payload={"active": False}),
)
request = Mock(args={})
request.args[b"access_token"] = [b"admin_token_value"]
request.requestHeaders.getRawHeaders = mock_getRawHeaders()
requester = self.get_success(self.auth.get_user_by_req(request))
self.assertEqual(
requester.user.to_string(), "@%s:%s" % ("__oidc_admin", SERVER_NAME)
)
self.assertEqual(requester.is_guest, False)
self.assertEqual(requester.device_id, None)
self.assertEqual(
get_awaitable_result(self.auth.is_server_admin(requester)), True
)
# There should be no call to the introspection endpoint
self.http_client.request.assert_not_called()

62
tests/replication/test_intro_token_invalidation.py
View file

@ -1,62 +0,0 @@
# Copyright 2023 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import Any, Dict
import synapse.rest.admin._base
from tests.replication._base import BaseMultiWorkerStreamTestCase
class IntrospectionTokenCacheInvalidationTestCase(BaseMultiWorkerStreamTestCase):
servlets = [synapse.rest.admin.register_servlets]
def default_config(self) -> Dict[str, Any]:
config = super().default_config()
config["disable_registration"] = True
config["experimental_features"] = {
"msc3861": {
"enabled": True,
"issuer": "some_dude",
"client_id": "ID",
"client_auth_method": "client_secret_post",
"client_secret": "secret",
}
}
return config
def test_stream_introspection_token_invalidation(self) -> None:
worker_hs = self.make_worker_hs("synapse.app.generic_worker")
auth = worker_hs.get_auth()
store = self.hs.get_datastores().main
# add a token to the cache on the worker
auth._token_cache["open_sesame"] = "intro_token" # type: ignore[attr-defined]
# stream the invalidation from the master
self.get_success(
store.stream_introspection_token_invalidation(("open_sesame",))
)
# check that the cache on the worker was invalidated
self.assertEqual(auth._token_cache.get("open_sesame"), None) # type: ignore[attr-defined]
# test invalidating whole cache
for i in range(0, 5):
auth._token_cache[f"open_sesame_{i}"] = f"intro_token_{i}" # type: ignore[attr-defined]
self.assertEqual(len(auth._token_cache), 5) # type: ignore[attr-defined]
self.get_success(store.stream_introspection_token_invalidation((None,)))
self.assertEqual(len(auth._token_cache), 0) # type: ignore[attr-defined]