Add config option to disable password login

synapse/config/password.py

@@ -0,0 +1,32 @@
+# -*- 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 ._base import Config
+
+
+class PasswordConfig(Config):
+    """Password login configuration
+    """
+
+    def read_config(self, config):
+        password_config = config.get("password_config", {})
+        self.password_enabled = password_config.get("enabled", True)
+
+    def default_config(self, config_dir_path, server_name, **kwargs):
+        return """
+        # Enable password for login.
+        password_config:
+           enabled: true
+        """