Modify auth.get_user_by_req for authing appservices directly.

Add logic to map the appservice token to the autogenned appservice user ID.
Add unit tests for all forms of get_user_by_req (user/appservice,
valid/bad/missing tokens)

synapse/api/auth.py

@@ -302,27 +302,26 @@ class Auth(object):
 
             # Check for application service tokens with a user_id override
             try:
-                if "user_id" not in request.args:
-                    # This has to be done like this rather than relying on it
-                    # natively throwing because tests use a Mock for the request
-                    # object which doesn't throw :/
-                    raise KeyError
-
-                masquerade_user_id = request.args["user_id"][0]
                 app_service = yield self.store.get_app_service_by_token(
                     access_token
                 )
                 if not app_service:
-                    raise AuthError(
-                        403, "Invalid application service access token"
-                    )
-                if not app_service.is_interested_in_user(masquerade_user_id):
-                    raise AuthError(
-                        403,
-                        "Application service cannot masquerade as this user."
-                    )
+                    raise KeyError
+
+                user_id = app_service.sender
+                if "user_id" in request.args:
+                    user_id = request.args["user_id"][0]
+                    if not app_service.is_interested_in_user(user_id):
+                        raise AuthError(
+                            403,
+                            "Application service cannot masquerade as this user."
+                        )
+
+                if not user_id:
+                    raise KeyError
+
                 defer.returnValue(
-                    (UserID.from_string(masquerade_user_id), ClientInfo("", ""))
+                    (UserID.from_string(user_id), ClientInfo("", ""))
                 )
                 return
             except KeyError:
@@ -366,8 +365,7 @@ class Auth(object):
         try:
             ret = yield self.store.get_user_by_token(token=token)
             if not ret:
-                raise StoreError()
-
+                raise StoreError(400, "Unknown token")
             user_info = {
                 "admin": bool(ret.get("admin", False)),
                 "device_id": ret.get("device_id"),

synapse/storage/appservice.py

@@ -215,6 +215,7 @@ class ApplicationServiceStore(SQLBaseStore):
                     "url": res["url"],
                     "token": as_token,
                     "hs_token": res["hs_token"],
+                    "sender": res["sender"],
                     "namespaces": {
                         ApplicationService.NS_USERS: [],
                         ApplicationService.NS_ALIASES: [],
@@ -240,6 +241,7 @@ class ApplicationServiceStore(SQLBaseStore):
                 token=service["token"],
                 url=service["url"],
                 namespaces=service["namespaces"],
-                hs_token=service["hs_token"]
+                hs_token=service["hs_token"],
+                sender=service["sender"]
             ))
 

tests/api/test_auth.py

@@ -0,0 +1,139 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 OpenMarket Ltd
+#
+# 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 tests import unittest
+from twisted.internet import defer
+
+from mock import Mock, NonCallableMock
+
+from synapse.api.auth import Auth
+from synapse.api.errors import AuthError
+from synapse.types import UserID
+
+class AuthTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.state_handler = Mock()
+        self.store = Mock()
+
+        self.hs = Mock()
+        self.hs.get_datastore = Mock(return_value=self.store)
+        self.hs.get_state_handler = Mock(return_value=self.state_handler)
+        self.auth = Auth(self.hs)
+
+        self.test_user = "@foo:bar"
+        self.test_token = "_test_token_"
+
+    @defer.inlineCallbacks
+    def test_get_user_by_req_user_valid_token(self):
+        self.store.get_app_service_by_token = Mock(return_value=None)
+        user_info = {
+            "name": self.test_user,
+            "device_id": "nothing",
+            "token_id": "ditto",
+            "admin": False
+        }
+        self.store.get_user_by_token = Mock(return_value=user_info)
+
+        request = Mock(args={})
+        request.args["access_token"] = [self.test_token]
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        (user, info) = yield self.auth.get_user_by_req(request)
+        self.assertEquals(user.to_string(), self.test_user)
+
+    def test_get_user_by_req_user_bad_token(self):
+        self.store.get_app_service_by_token = Mock(return_value=None)
+        self.store.get_user_by_token = Mock(return_value=None)
+
+        request = Mock(args={})
+        request.args["access_token"] = [self.test_token]
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        d = self.auth.get_user_by_req(request)
+        self.failureResultOf(d, AuthError)
+
+    def test_get_user_by_req_user_missing_token(self):
+        self.store.get_app_service_by_token = Mock(return_value=None)
+        user_info = {
+            "name": self.test_user,
+            "device_id": "nothing",
+            "token_id": "ditto",
+            "admin": False
+        }
+        self.store.get_user_by_token = Mock(return_value=user_info)
+
+        request = Mock(args={})
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        d = self.auth.get_user_by_req(request)
+        self.failureResultOf(d, AuthError)
+
+    @defer.inlineCallbacks
+    def test_get_user_by_req_appservice_valid_token(self):
+        app_service = Mock(token="foobar", url="a_url", sender=self.test_user)
+        self.store.get_app_service_by_token = Mock(return_value=app_service)
+        self.store.get_user_by_token = Mock(return_value=None)
+
+        request = Mock(args={})
+        request.args["access_token"] = [self.test_token]
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        (user, info) = yield self.auth.get_user_by_req(request)
+        self.assertEquals(user.to_string(), self.test_user)
+
+    def test_get_user_by_req_appservice_bad_token(self):
+        self.store.get_app_service_by_token = Mock(return_value=None)
+        self.store.get_user_by_token = Mock(return_value=None)
+
+        request = Mock(args={})
+        request.args["access_token"] = [self.test_token]
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        d = self.auth.get_user_by_req(request)
+        self.failureResultOf(d, AuthError)
+
+    def test_get_user_by_req_appservice_missing_token(self):
+        app_service = Mock(token="foobar", url="a_url", sender=self.test_user)
+        self.store.get_app_service_by_token = Mock(return_value=app_service)
+        self.store.get_user_by_token = Mock(return_value=None)
+
+        request = Mock(args={})
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        d = self.auth.get_user_by_req(request)
+        self.failureResultOf(d, AuthError)
+
+    @defer.inlineCallbacks
+    def test_get_user_by_req_appservice_valid_token_valid_user_id(self):
+        masquerading_user_id = "@doppelganger:matrix.org"
+        app_service = Mock(token="foobar", url="a_url", sender=self.test_user)
+        app_service.is_interested_in_user = Mock(return_value=True)
+        self.store.get_app_service_by_token = Mock(return_value=app_service)
+        self.store.get_user_by_token = Mock(return_value=None)
+
+        request = Mock(args={})
+        request.args["access_token"] = [self.test_token]
+        request.args["user_id"] = [masquerading_user_id]
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        (user, info) = yield self.auth.get_user_by_req(request)
+        self.assertEquals(user.to_string(), masquerading_user_id)
+
+    def test_get_user_by_req_appservice_valid_token_bad_user_id(self):
+        masquerading_user_id = "@doppelganger:matrix.org"
+        app_service = Mock(token="foobar", url="a_url", sender=self.test_user)
+        app_service.is_interested_in_user = Mock(return_value=False)
+        self.store.get_app_service_by_token = Mock(return_value=app_service)
+        self.store.get_user_by_token = Mock(return_value=None)
+
+        request = Mock(args={})
+        request.args["access_token"] = [self.test_token]
+        request.args["user_id"] = [masquerading_user_id]
+        request.requestHeaders.getRawHeaders = Mock(return_value=[""])
+        d = self.auth.get_user_by_req(request)
+        self.failureResultOf(d, AuthError)

tests/rest/client/v1/test_presence.py

@@ -65,6 +65,7 @@ class PresenceStateTestCase(unittest.TestCase):
         hs.handlers = JustPresenceHandlers(hs)
 
         self.datastore = hs.get_datastore()
+        self.datastore.get_app_service_by_token = Mock(return_value=None)
 
         def get_presence_list(*a, **kw):
             return defer.succeed([])
@@ -154,6 +155,7 @@ class PresenceListTestCase(unittest.TestCase):
         hs.handlers = JustPresenceHandlers(hs)
 
         self.datastore = hs.get_datastore()
+        self.datastore.get_app_service_by_token = Mock(return_value=None)
 
         def has_presence_state(user_localpart):
             return defer.succeed(
@@ -303,6 +305,7 @@ class PresenceEventStreamTestCase(unittest.TestCase):
         hs.handlers.room_member_handler.get_rooms_for_user = get_rooms_for_user
 
         self.mock_datastore = hs.get_datastore()
+        self.mock_datastore.get_app_service_by_token = Mock(return_value=None)
 
         def get_profile_displayname(user_id):
             return defer.succeed("Frank")

tests/rest/client/v2_alpha/__init__.py

@@ -59,6 +59,8 @@ class V2AlphaRestTestCase(unittest.TestCase):
             r.register_servlets(hs, self.mock_resource)
 
     def make_datastore_mock(self):
-        return Mock(spec=[
+        store =  Mock(spec=[
             "insert_client_ip",
         ])
+        store.get_app_service_by_token = Mock(return_value=None)
+        return store