Add configurable room list publishing rules

This allows specifying who and what is allowed to be published onto the
public room list

synapse/config/room_directory.py

@@ -23,70 +23,121 @@ class RoomDirectoryConfig(Config):
         alias_creation_rules = config["alias_creation_rules"]
 
         self._alias_creation_rules = [
-            _AliasRule(rule)
+            _RoomDirectoryRule("alias_creation_rules", rule)
             for rule in alias_creation_rules
         ]
 
+        room_list_publication_rules = config["room_list_publication_rules"]
+
+        self._room_list_publication_rules = [
+            _RoomDirectoryRule("room_list_publication_rules", rule)
+            for rule in room_list_publication_rules
+        ]
+
     def default_config(self, config_dir_path, server_name, **kwargs):
         return """
         # The `alias_creation` option controls who's allowed to create aliases
         # on this server.
         #
         # The format of this option is a list of rules that contain globs that
-        # match against user_id and the new alias (fully qualified with server
-        # name). The action in the first rule that matches is taken, which can
-        # currently either be "allow" or "deny".
+        # match against user_id, room_id and the new alias (fully qualified with
+        # server name). The action in the first rule that matches is taken,
+        # which can currently either be "allow" or "deny".
+        #
+        # Missing user_id/room_id/alias fields default to "*".
         #
         # If no rules match the request is denied.
         alias_creation_rules:
             - user_id: "*"
-              alias: "*"
+              alias: "*"      # This matches alias being created
+              room_id: "*"
+              action: allow
+
+        # The `room_list_publication_rules` option control who and what can be
+        # published in the public room list.
+        #
+        # The format of this option is the same as that for
+        # `alias_creation_rules`
+        room_list_publication_rules:
+            - user_id: "*"
+              alias: "*"      # This matches any local or canonical alias
+                              # associated with the room
+              room_id: "*"
               action: allow
         """
 
-    def is_alias_creation_allowed(self, user_id, alias):
+    def is_alias_creation_allowed(self, user_id, room_id, alias):
         """Checks if the given user is allowed to create the given alias
 
         Args:
             user_id (str)
+            room_id (str)
             alias (str)
 
         Returns:
             boolean: True if user is allowed to crate the alias
         """
         for rule in self._alias_creation_rules:
-            if rule.matches(user_id, alias):
+            if rule.matches(user_id, room_id, [alias]):
+                return rule.action == "allow"
+
+        return False
+
+    def is_publishing_room_allowed(self, user_id, room_id, aliases):
+        """Checks if the given user is allowed to publish the room
+
+        Args:
+            user_id (str)
+            room_id (str)
+            aliases (list[str]): any local aliases associated with the room
+
+        Returns:
+            boolean: True if user can publish room
+        """
+        for rule in self._room_list_publication_rules:
+            if rule.matches(user_id, room_id, aliases):
                 return rule.action == "allow"
 
         return False
 
 
-class _AliasRule(object):
-    def __init__(self, rule):
+class _RoomDirectoryRule(object):
+    """Helper class to test whether a room directory action is allowed, like
+    creating an alias or publishing a room.
+    """
+
+    def __init__(self, option_name, rule):
         action = rule["action"]
-        user_id = rule["user_id"]
-        alias = rule["alias"]
+        user_id = rule.get("user_id", "*")
+        room_id = rule.get("room_id", "*")
+        alias = rule.get("alias", "*")
 
         if action in ("allow", "deny"):
             self.action = action
         else:
             raise ConfigError(
-                "alias_creation_rules rules can only have action of 'allow'"
-                " or 'deny'"
+                "%s rules can only have action of 'allow'"
+                " or 'deny'" % (option_name,)
             )
 
+        self._alias_matches_all = alias == "*"
+
         try:
             self._user_id_regex = glob_to_regex(user_id)
             self._alias_regex = glob_to_regex(alias)
+            self._room_id_regex = glob_to_regex(room_id)
         except Exception as e:
             raise ConfigError("Failed to parse glob into regex: %s", e)
 
-    def matches(self, user_id, alias):
-        """Tests if this rule matches the given user_id and alias.
+    def matches(self, user_id, room_id, aliases):
+        """Tests if this rule matches the given user_id, room_id and aliases.
 
         Args:
             user_id (str)
-            alias (str)
+            room_id (str)
+            aliases (list[str]): The associated aliases to the room. Will be a
+                single element for testing alias creation, and can be empty for
+                testing room publishing.
 
         Returns:
             boolean
@@ -96,7 +147,16 @@ class _AliasRule(object):
         if not self._user_id_regex.match(user_id):
             return False
 
+        # If we are not given any aliases then this rule only matches if the
+        # alias glob matches all aliases
+        if not aliases and not self._alias_matches_all:
+            return False
+
+        for alias in aliases:
             if not self._alias_regex.match(alias):
                 return False
 
+        if not self._room_id_regex.match(room_id):
+            return False
+
         return True

synapse/handlers/directory.py

@@ -112,7 +112,9 @@ class DirectoryHandler(BaseHandler):
                     403, "This user is not permitted to create this alias",
                 )
 
-            if not self.config.is_alias_creation_allowed(user_id, room_alias.to_string()):
+            if not self.config.is_alias_creation_allowed(
+                user_id, room_id, room_alias.to_string(),
+            ):
                 # Lets just return a generic message, as there may be all sorts of
                 # reasons why we said no. TODO: Allow configurable error messages
                 # per alias creation rule?
@@ -395,9 +397,9 @@ class DirectoryHandler(BaseHandler):
         room_id (str)
         visibility (str): "public" or "private"
         """
-        if not self.spam_checker.user_may_publish_room(
-            requester.user.to_string(), room_id
-        ):
+        user_id = requester.user.to_string()
+
+        if not self.spam_checker.user_may_publish_room(user_id, room_id):
             raise AuthError(
                 403,
                 "This user is not permitted to publish rooms to the room list"
@@ -415,7 +417,24 @@ class DirectoryHandler(BaseHandler):
 
         yield self.auth.check_can_change_room_list(room_id, requester.user)
 
-        yield self.store.set_room_is_public(room_id, visibility == "public")
+        room_aliases = yield self.store.get_aliases_for_room(room_id)
+        canonical_alias = yield self.store.get_canonical_alias_for_room(room_id)
+        if canonical_alias:
+            room_aliases.append(canonical_alias)
+
+        making_public = visibility == "public"
+
+        if making_public and not self.config.is_publishing_room_allowed(
+            user_id, room_id, room_aliases,
+        ):
+            # Lets just return a generic message, as there may be all sorts of
+            # reasons why we said no. TODO: Allow configurable error messages
+            # per alias creation rule?
+            raise SynapseError(
+                403, "Not allowed to publish room",
+            )
+
+        yield self.store.set_room_is_public(room_id, making_public)
 
     @defer.inlineCallbacks
     def edit_published_appservice_room_list(self, appservice_id, network_id,

synapse/storage/state.py

@@ -548,6 +548,31 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
             _get_filtered_current_state_ids_txn,
         )
 
+    @defer.inlineCallbacks
+    def get_canonical_alias_for_room(self, room_id):
+        """Get canonical alias for room, if any
+
+        Args:
+            room_id (str)
+
+        Returns:
+            Deferred[str|None]: The canonical alias, if any
+        """
+
+        state = yield self.get_filtered_current_state_ids(room_id, StateFilter.from_types(
+            [(EventTypes.CanonicalAlias, "")]
+        ))
+
+        event_id = state.get((EventTypes.CanonicalAlias, ""))
+        if not event_id:
+            return
+
+        event = yield self.get_event(event_id, allow_none=True)
+        if not event:
+            return
+
+        defer.returnValue(event.content.get("canonical_alias"))
+
     @cached(max_entries=10000, iterable=True)
     def get_state_group_delta(self, state_group):
         """Given a state group try to return a previous group and a delta between

tests/config/test_room_directory.py

@@ -36,6 +36,8 @@ class RoomDirectoryConfigTestCase(unittest.TestCase):
             - user_id: "@gah:example.com"
               alias: "#goo:example.com"
               action: "allow"
+
+        room_list_publication_rules: []
         """)
 
         rd_config = RoomDirectoryConfig()
@@ -43,25 +45,96 @@ class RoomDirectoryConfigTestCase(unittest.TestCase):
 
         self.assertFalse(rd_config.is_alias_creation_allowed(
             user_id="@bob:example.com",
+            room_id="!test",
             alias="#test:example.com",
         ))
 
         self.assertTrue(rd_config.is_alias_creation_allowed(
             user_id="@test:example.com",
+            room_id="!test",
             alias="#unofficial_st:example.com",
         ))
 
         self.assertTrue(rd_config.is_alias_creation_allowed(
             user_id="@foobar:example.com",
+            room_id="!test",
             alias="#test:example.com",
         ))
 
         self.assertTrue(rd_config.is_alias_creation_allowed(
             user_id="@gah:example.com",
+            room_id="!test",
             alias="#goo:example.com",
         ))
 
         self.assertFalse(rd_config.is_alias_creation_allowed(
             user_id="@test:example.com",
+            room_id="!test",
             alias="#test:example.com",
         ))
+
+    def test_room_publish_acl(self):
+        config = yaml.load("""
+        alias_creation_rules: []
+
+        room_list_publication_rules:
+            - user_id: "*bob*"
+              alias: "*"
+              action: "deny"
+            - user_id: "*"
+              alias: "#unofficial_*"
+              action: "allow"
+            - user_id: "@foo*:example.com"
+              alias: "*"
+              action: "allow"
+            - user_id: "@gah:example.com"
+              alias: "#goo:example.com"
+              action: "allow"
+            - room_id: "!test-deny"
+              action: "deny"
+        """)
+
+        rd_config = RoomDirectoryConfig()
+        rd_config.read_config(config)
+
+        self.assertFalse(rd_config.is_publishing_room_allowed(
+            user_id="@bob:example.com",
+            room_id="!test",
+            aliases=["#test:example.com"],
+        ))
+
+        self.assertTrue(rd_config.is_publishing_room_allowed(
+            user_id="@test:example.com",
+            room_id="!test",
+            aliases=["#unofficial_st:example.com"],
+        ))
+
+        self.assertTrue(rd_config.is_publishing_room_allowed(
+            user_id="@foobar:example.com",
+            room_id="!test",
+            aliases=[],
+        ))
+
+        self.assertTrue(rd_config.is_publishing_room_allowed(
+            user_id="@gah:example.com",
+            room_id="!test",
+            aliases=["#goo:example.com"],
+        ))
+
+        self.assertFalse(rd_config.is_publishing_room_allowed(
+            user_id="@test:example.com",
+            room_id="!test",
+            aliases=["#test:example.com"],
+        ))
+
+        self.assertTrue(rd_config.is_publishing_room_allowed(
+            user_id="@foobar:example.com",
+            room_id="!test-deny",
+            aliases=[],
+        ))
+
+        self.assertFalse(rd_config.is_publishing_room_allowed(
+            user_id="@gah:example.com",
+            room_id="!test-deny",
+            aliases=[],
+        ))

tests/handlers/test_directory.py

@@ -121,6 +121,7 @@ class TestCreateAliasACL(unittest.HomeserverTestCase):
                 "action": "allow",
             }
         ]
+        config["room_list_publication_rules"] = []
 
         rd_config = RoomDirectoryConfig()
         rd_config.read_config(config)