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Make the api.auth.Auth a Protocol

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This commit is contained in:
Quentin Gliech 2022-06-17 14:48:55 +02:00 committed by Patrick Cloke
parent 5d8c659373
commit e2c8458bba
7 changed files with 464 additions and 248 deletions
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175
synapse/api/auth/__init__.py Normal file
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@ -0,0 +1,175 @@
# Copyright 2023 The Matrix.org Foundation.
#
# 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 Optional, Tuple
from typing_extensions import Protocol
from twisted.web.server import Request
from synapse.appservice import ApplicationService
from synapse.http.site import SynapseRequest
from synapse.types import Requester
# guests always get this device id.
GUEST_DEVICE_ID = "guest_device"
class Auth(Protocol):
"""The interface that an auth provider must implement."""
async def check_user_in_room(
self,
room_id: str,
requester: Requester,
allow_departed_users: bool = False,
) -> Tuple[str, Optional[str]]:
"""Check if the user is in the room, or was at some point.
Args:
room_id: The room to check.
user_id: The user to check.
current_state: Optional map of the current state of the room.
If provided then that map is used to check whether they are a
member of the room. Otherwise the current membership is
loaded from the database.
allow_departed_users: if True, accept users that were previously
members but have now departed.
Raises:
AuthError if the user is/was not in the room.
Returns:
The current membership of the user in the room and the
membership event ID of the user.
"""
async def get_user_by_req(
self,
request: SynapseRequest,
allow_guest: bool = False,
allow_expired: bool = False,
) -> Requester:
"""Get a registered user's ID.
Args:
request: An HTTP request with an access_token query parameter.
allow_guest: If False, will raise an AuthError if the user making the
request is a guest.
allow_expired: If True, allow the request through even if the account
is expired, or session token lifetime has ended. Note that
/login will deliver access tokens regardless of expiration.
Returns:
Resolves to the requester
Raises:
InvalidClientCredentialsError if no user by that token exists or the token
is invalid.
AuthError if access is denied for the user in the access token
"""
async def validate_appservice_can_control_user_id(
self, app_service: ApplicationService, user_id: str
) -> None:
"""Validates that the app service is allowed to control
the given user.
Args:
app_service: The app service that controls the user
user_id: The author MXID that the app service is controlling
Raises:
AuthError: If the application service is not allowed to control the user
(user namespace regex does not match, wrong homeserver, etc)
or if the user has not been registered yet.
"""
async def get_user_by_access_token(
self,
token: str,
allow_expired: bool = False,
) -> Requester:
"""Validate access token and get user_id from it
Args:
token: The access token to get the user by
allow_expired: If False, raises an InvalidClientTokenError
if the token is expired
Raises:
InvalidClientTokenError if a user by that token exists, but the token is
expired
InvalidClientCredentialsError if no user by that token exists or the token
is invalid
"""
async def is_server_admin(self, requester: Requester) -> bool:
"""Check if the given user is a local server admin.
Args:
requester: user to check
Returns:
True if the user is an admin
"""
async def check_can_change_room_list(
self, room_id: str, requester: Requester
) -> bool:
"""Determine whether the user is allowed to edit the room's entry in the
published room list.
Args:
room_id
user
"""
@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.
"""
@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
"""
async def check_user_in_room_or_world_readable(
self, room_id: str, requester: Requester, 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.
"""

273
synapse/api/auth/base.py Normal file
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@ -0,0 +1,273 @@
# Copyright 2023 The Matrix.org Foundation.
#
# 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.
import logging
from typing import TYPE_CHECKING, Optional, Tuple
from twisted.web.server import Request
from synapse import event_auth
from synapse.api.constants import EventTypes, HistoryVisibility, Membership
from synapse.api.errors import (
AuthError,
Codes,
MissingClientTokenError,
UnstableSpecAuthError,
)
from synapse.appservice import ApplicationService
from synapse.logging.opentracing import trace
from synapse.types import Requester
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class BaseAuth:
"""Common base class for all auth implementations."""
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.store = hs.get_datastores().main
self._storage_controllers = hs.get_storage_controllers()
async def check_user_in_room(
self,
room_id: str,
requester: Requester,
allow_departed_users: bool = False,
) -> Tuple[str, Optional[str]]:
"""Check if the user is in the room, or was at some point.
Args:
room_id: The room to check.
requester: The user making the request, according to the access token.
current_state: Optional map of the current state of the room.
If provided then that map is used to check whether they are a
member of the room. Otherwise the current membership is
loaded from the database.
allow_departed_users: if True, accept users that were previously
members but have now departed.
Raises:
AuthError if the user is/was not in the room.
Returns:
The current membership of the user in the room and the
membership event ID of the user.
"""
user_id = requester.user.to_string()
(
membership,
member_event_id,
) = await self.store.get_local_current_membership_for_user_in_room(
user_id=user_id,
room_id=room_id,
)
if membership:
if membership == Membership.JOIN:
return membership, member_event_id
# XXX this looks totally bogus. Why do we not allow users who have been banned,
# or those who were members previously and have been re-invited?
if allow_departed_users and membership == Membership.LEAVE:
forgot = await self.store.did_forget(user_id, room_id)
if not forgot:
return membership, member_event_id
raise UnstableSpecAuthError(
403,
"User %s not in room %s" % (user_id, room_id),
errcode=Codes.NOT_JOINED,
)
@trace
async def check_user_in_room_or_world_readable(
self, room_id: str, requester: Requester, 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.
return await self.check_user_in_room(
room_id, requester, allow_departed_users=allow_departed_users
)
except AuthError:
visibility = await self._storage_controllers.state.get_current_state_event(
room_id, EventTypes.RoomHistoryVisibility, ""
)
if (
visibility
and visibility.content.get("history_visibility")
== HistoryVisibility.WORLD_READABLE
):
return Membership.JOIN, None
raise AuthError(
403,
"User %r not in room %s, and room previews are disabled"
% (requester.user, room_id),
)
async def validate_appservice_can_control_user_id(
self, app_service: ApplicationService, user_id: str
) -> None:
"""Validates that the app service is allowed to control
the given user.
Args:
app_service: The app service that controls the user
user_id: The author MXID that the app service is controlling
Raises:
AuthError: If the application service is not allowed to control the user
(user namespace regex does not match, wrong homeserver, etc)
or if the user has not been registered yet.
"""
# It's ok if the app service is trying to use the sender from their registration
if app_service.sender == user_id:
pass
# Check to make sure the app service is allowed to control the user
elif not app_service.is_interested_in_user(user_id):
raise AuthError(
403,
"Application service cannot masquerade as this user (%s)." % user_id,
)
# Check to make sure the user is already registered on the homeserver
elif not (await self.store.get_user_by_id(user_id)):
raise AuthError(
403, "Application service has not registered this user (%s)" % user_id
)
async def is_server_admin(self, requester: Requester) -> bool:
"""Check if the given user is a local server admin.
Args:
requester: user to check
Returns:
True if the user is an admin
"""
raise NotImplementedError()
async def check_can_change_room_list(
self, room_id: str, requester: Requester
) -> 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(requester)
if is_admin:
return True
await self.check_user_in_room(room_id, requester)
# 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._storage_controllers.state.get_current_state_event(
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(
requester.user.to_string(), 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")

249
synapse/api/auth.py → synapse/api/auth/internal.py
View file

@ -1,4 +1,4 @@
# Copyright 2014 - 2016 OpenMarket Ltd
# Copyright 2023 The Matrix.org Foundation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -12,113 +12,49 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import TYPE_CHECKING, Optional, Tuple
from typing import TYPE_CHECKING, Optional
import pymacaroons
from netaddr import IPAddress
from twisted.web.server import Request
from synapse import event_auth
from synapse.api.constants import EventTypes, HistoryVisibility, Membership
from synapse.api.errors import (
AuthError,
Codes,
InvalidClientTokenError,
MissingClientTokenError,
UnstableSpecAuthError,
)
from synapse.appservice import ApplicationService
from synapse.http import get_request_user_agent
from synapse.http.site import SynapseRequest
from synapse.logging.opentracing import (
active_span,
force_tracing,
start_active_span,
trace,
)
from synapse.logging.opentracing import active_span, force_tracing, start_active_span
from synapse.types import Requester, create_requester
from synapse.util.cancellation import cancellable
from . import GUEST_DEVICE_ID
from .base import BaseAuth
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
# guests always get this device id.
GUEST_DEVICE_ID = "guest_device"
class Auth:
class InternalAuth(BaseAuth):
"""
This class contains functions for authenticating users of our client-server API.
"""
def __init__(self, hs: "HomeServer"):
self.hs = hs
super().__init__(hs)
self.clock = hs.get_clock()
self.store = hs.get_datastores().main
self._account_validity_handler = hs.get_account_validity_handler()
self._storage_controllers = hs.get_storage_controllers()
self._macaroon_generator = hs.get_macaroon_generator()
self._track_appservice_user_ips = hs.config.appservice.track_appservice_user_ips
self._track_puppeted_user_ips = hs.config.api.track_puppeted_user_ips
self._force_tracing_for_users = hs.config.tracing.force_tracing_for_users
async def check_user_in_room(
self,
room_id: str,
requester: Requester,
allow_departed_users: bool = False,
) -> Tuple[str, Optional[str]]:
"""Check if the user is in the room, or was at some point.
Args:
room_id: The room to check.
requester: The user making the request, according to the access token.
current_state: Optional map of the current state of the room.
If provided then that map is used to check whether they are a
member of the room. Otherwise the current membership is
loaded from the database.
allow_departed_users: if True, accept users that were previously
members but have now departed.
Raises:
AuthError if the user is/was not in the room.
Returns:
The current membership of the user in the room and the
membership event ID of the user.
"""
user_id = requester.user.to_string()
(
membership,
member_event_id,
) = await self.store.get_local_current_membership_for_user_in_room(
user_id=user_id,
room_id=room_id,
)
if membership:
if membership == Membership.JOIN:
return membership, member_event_id
# XXX this looks totally bogus. Why do we not allow users who have been banned,
# or those who were members previously and have been re-invited?
if allow_departed_users and membership == Membership.LEAVE:
forgot = await self.store.did_forget(user_id, room_id)
if not forgot:
return membership, member_event_id
raise UnstableSpecAuthError(
403,
"User %s not in room %s" % (user_id, room_id),
errcode=Codes.NOT_JOINED,
)
@cancellable
async def get_user_by_req(
self,
@ -253,37 +189,6 @@ class Auth:
except KeyError:
raise MissingClientTokenError()
async def validate_appservice_can_control_user_id(
self, app_service: ApplicationService, user_id: str
) -> None:
"""Validates that the app service is allowed to control
the given user.
Args:
app_service: The app service that controls the user
user_id: The author MXID that the app service is controlling
Raises:
AuthError: If the application service is not allowed to control the user
(user namespace regex does not match, wrong homeserver, etc)
or if the user has not been registered yet.
"""
# It's ok if the app service is trying to use the sender from their registration
if app_service.sender == user_id:
pass
# Check to make sure the app service is allowed to control the user
elif not app_service.is_interested_in_user(user_id):
raise AuthError(
403,
"Application service cannot masquerade as this user (%s)." % user_id,
)
# Check to make sure the user is already registered on the homeserver
elif not (await self.store.get_user_by_id(user_id)):
raise AuthError(
403, "Application service has not registered this user (%s)" % user_id
)
@cancellable
async def _get_appservice_user(self, request: Request) -> Optional[Requester]:
"""
@ -462,141 +367,3 @@ class Auth:
True if the user is an admin
"""
return await self.store.is_server_admin(requester.user)
async def check_can_change_room_list(
self, room_id: str, requester: Requester
) -> bool:
"""Determine whether the user is allowed to edit the room's entry in the
published room list.
Args:
room_id: The room to check.
requester: The user making the request, according to the access token.
"""
is_admin = await self.is_server_admin(requester)
if is_admin:
return True
await self.check_user_in_room(room_id, requester)
# 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._storage_controllers.state.get_current_state_event(
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(
requester.user.to_string(), 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
@cancellable
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")
@trace
async def check_user_in_room_or_world_readable(
self, room_id: str, requester: Requester, 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: The room to check.
requester: The user making the request, according to the access token.
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.
return await self.check_user_in_room(
room_id, requester, allow_departed_users=allow_departed_users
)
except AuthError:
visibility = await self._storage_controllers.state.get_current_state_event(
room_id, EventTypes.RoomHistoryVisibility, ""
)
if (
visibility
and visibility.content.get("history_visibility")
== HistoryVisibility.WORLD_READABLE
):
return Membership.JOIN, None
raise UnstableSpecAuthError(
403,
"User %s not in room %s, and room previews are disabled"
% (requester.user, room_id),
errcode=Codes.NOT_JOINED,
)

3
synapse/server.py
View file

@ -31,6 +31,7 @@ from twisted.web.iweb import IPolicyForHTTPS
from twisted.web.resource import Resource
from synapse.api.auth import Auth
from synapse.api.auth.internal import InternalAuth
from synapse.api.auth_blocking import AuthBlocking
from synapse.api.filtering import Filtering
from synapse.api.ratelimiting import Ratelimiter, RequestRatelimiter
@ -427,7 +428,7 @@ class HomeServer(metaclass=abc.ABCMeta):
@cache_in_self
def get_auth(self) -> Auth:
return Auth(self)
return InternalAuth(self)
@cache_in_self
def get_auth_blocking(self) -> AuthBlocking:

4
tests/api/test_auth.py
View file

@ -18,7 +18,7 @@ import pymacaroons
from twisted.test.proto_helpers import MemoryReactor
from synapse.api.auth import Auth
from synapse.api.auth.internal import InternalAuth
from synapse.api.auth_blocking import AuthBlocking
from synapse.api.constants import UserTypes
from synapse.api.errors import (
@ -48,7 +48,7 @@ class AuthTestCase(unittest.HomeserverTestCase):
# have been called by the HomeserverTestCase machinery.
hs.datastores.main = self.store # type: ignore[union-attr]
hs.get_auth_handler().store = self.store
self.auth = Auth(hs)
self.auth = InternalAuth(hs)
# AuthBlocking reads from the hs' config on initialization. We need to
# modify its config instead of the hs'

4
tests/handlers/test_register.py
View file

@ -17,7 +17,7 @@ from unittest.mock import Mock
from twisted.test.proto_helpers import MemoryReactor
from synapse.api.auth import Auth
from synapse.api.auth.internal import InternalAuth
from synapse.api.constants import UserTypes
from synapse.api.errors import (
CodeMessageException,
@ -683,7 +683,7 @@ class RegistrationTestCase(unittest.HomeserverTestCase):
request = Mock(args={})
request.args[b"access_token"] = [token.encode("ascii")]
request.requestHeaders.getRawHeaders = mock_getRawHeaders()
auth = Auth(self.hs)
auth = InternalAuth(self.hs)
requester = self.get_success(auth.get_user_by_req(request))
self.assertTrue(requester.shadow_banned)

4
tests/test_state.py
View file

@ -28,7 +28,7 @@ from unittest.mock import Mock
from twisted.internet import defer
from synapse.api.auth import Auth
from synapse.api.auth.internal import InternalAuth
from synapse.api.constants import EventTypes, Membership
from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase, make_event_from_dict
@ -240,7 +240,7 @@ class StateTestCase(unittest.TestCase):
hs.get_macaroon_generator.return_value = MacaroonGenerator(
clock, "tesths", b"verysecret"
)
hs.get_auth.return_value = Auth(hs)
hs.get_auth.return_value = InternalAuth(hs)
hs.get_state_resolution_handler = lambda: StateResolutionHandler(hs)
hs.get_storage_controllers.return_value = storage_controllers