Merge tag 'v0.31.2'

SECURITY UPDATE: Prevent unauthorised users from setting state events in a room
when there is no `m.room.power_levels` event in force in the room. (PR #3397)

Discussion around the Matrix Spec change proposal for this change can be
followed at https://github.com/matrix-org/matrix-doc/issues/1304.

1 files changed, 151 insertions, 0 deletions

diff --git a/tests/test_event_auth.py b/tests/test_event_auth.py
new file mode 100644
index 0000000000..d08e19c53a
--- /dev/null
+++ b/tests/test_event_auth.py
@@ -0,0 +1,151 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector 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 synapse import event_auth
+from synapse.api.errors import AuthError
+from synapse.events import FrozenEvent
+import unittest
+
+
+class EventAuthTestCase(unittest.TestCase):
+    def test_random_users_cannot_send_state_before_first_pl(self):
+        """
+        Check that, before the first PL lands, the creator is the only user
+        that can send a state event.
+        """
+        creator = "@creator:example.com"
+        joiner = "@joiner:example.com"
+        auth_events = {
+            ("m.room.create", ""): _create_event(creator),
+            ("m.room.member", creator): _join_event(creator),
+            ("m.room.member", joiner): _join_event(joiner),
+        }
+
+        # creator should be able to send state
+        event_auth.check(
+            _random_state_event(creator), auth_events,
+            do_sig_check=False,
+        )
+
+        # joiner should not be able to send state
+        self.assertRaises(
+            AuthError,
+            event_auth.check,
+            _random_state_event(joiner),
+            auth_events,
+            do_sig_check=False,
+        ),
+
+    def test_state_default_level(self):
+        """
+        Check that users above the state_default level can send state and
+        those below cannot
+        """
+        creator = "@creator:example.com"
+        pleb = "@joiner:example.com"
+        king = "@joiner2:example.com"
+
+        auth_events = {
+            ("m.room.create", ""): _create_event(creator),
+            ("m.room.member", creator): _join_event(creator),
+            ("m.room.power_levels", ""): _power_levels_event(creator, {
+                "state_default": "30",
+                "users": {
+                    pleb: "29",
+                    king: "30",
+                },
+            }),
+            ("m.room.member", pleb): _join_event(pleb),
+            ("m.room.member", king): _join_event(king),
+        }
+
+        # pleb should not be able to send state
+        self.assertRaises(
+            AuthError,
+            event_auth.check,
+            _random_state_event(pleb),
+            auth_events,
+            do_sig_check=False,
+        ),
+
+        # king should be able to send state
+        event_auth.check(
+            _random_state_event(king), auth_events,
+            do_sig_check=False,
+        )
+
+
+# helpers for making events
+
+TEST_ROOM_ID = "!test:room"
+
+
+def _create_event(user_id):
+    return FrozenEvent({
+        "room_id": TEST_ROOM_ID,
+        "event_id": _get_event_id(),
+        "type": "m.room.create",
+        "sender": user_id,
+        "content": {
+            "creator": user_id,
+        },
+    })
+
+
+def _join_event(user_id):
+    return FrozenEvent({
+        "room_id": TEST_ROOM_ID,
+        "event_id": _get_event_id(),
+        "type": "m.room.member",
+        "sender": user_id,
+        "state_key": user_id,
+        "content": {
+            "membership": "join",
+        },
+    })
+
+
+def _power_levels_event(sender, content):
+    return FrozenEvent({
+        "room_id": TEST_ROOM_ID,
+        "event_id": _get_event_id(),
+        "type": "m.room.power_levels",
+        "sender": sender,
+        "state_key": "",
+        "content": content,
+    })
+
+
+def _random_state_event(sender):
+    return FrozenEvent({
+        "room_id": TEST_ROOM_ID,
+        "event_id": _get_event_id(),
+        "type": "test.state",
+        "sender": sender,
+        "state_key": "",
+        "content": {
+            "membership": "join",
+        },
+    })
+
+
+event_count = 0
+
+
+def _get_event_id():
+    global event_count
+    c = event_count
+    event_count += 1
+    return "!%i:example.com" % (c, )