Get credentials from metadata for WinRM auth plugin

ConfigWinRMCertificateAuthPlugin plugin depends on SetUserPasswordPlugin
and CreateUserPlugin in order to retrieve the credentials which will
be used for setting up the WinRM authentication. This is not desirable,
since ConfigWinRMCertificateAuthPlugin can't run independently
of the other two. This patch obtains the username from the config file,
if it is not found in the shared data dictionary and it retrieves
the password using get_admin_password from the metadata service, if it
is not found in the shared data dictionary.

Change-Id: I587782ff9cb8989bf01f6d86dbdbd1fa6ec53d1b
Closes-Bug: #1433174

cloudbaseinit/plugins/windows/winrmcertificateauth.py

@@ -12,6 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from oslo.config import cfg
+
 from cloudbaseinit import exception
 from cloudbaseinit.openstack.common import log as logging
 from cloudbaseinit.osutils import factory as osutils_factory
@@ -22,23 +24,30 @@ from cloudbaseinit.utils.windows import winrmconfig
 from cloudbaseinit.utils.windows import x509
 
 
+CONF = cfg.CONF
+CONF.import_opt('username', 'cloudbaseinit.plugins.common.createuser')
 LOG = logging.getLogger(__name__)
 
 
 class ConfigWinRMCertificateAuthPlugin(base.BasePlugin):
 
-    def _get_credentials(self, shared_data):
-        user_name = shared_data.get(constants.SHARED_DATA_USERNAME)
+    @staticmethod
+    def _get_credentials(service, shared_data):
+        user_name = shared_data.get(constants.SHARED_DATA_USERNAME,
+                                    CONF.username)
         if not user_name:
             raise exception.CloudbaseInitException(
                 "Cannot execute plugin as the username has not been set in "
-                "the plugins shared data")
+                "the plugins shared data, nor it was found in config file.")
 
         password = shared_data.get(constants.SHARED_DATA_PASSWORD)
+        if not password:
+            password = service.get_admin_password()
             if not password:
                 raise exception.CloudbaseInitException(
-                "Cannot execute plugin as the password has not been set in the"
-                " plugins shared data")
+                    "Cannot execute plugin as the password has not been set "
+                    "in the plugins shared data, nor it was retrieved "
+                    "from the metadata service.")
 
         # For security reasons unset the password in the shared_data
         # as it is currently not needed by other plugins
@@ -47,7 +56,7 @@ class ConfigWinRMCertificateAuthPlugin(base.BasePlugin):
         return (user_name, password)
 
     def execute(self, service, shared_data):
-        user_name, password = self._get_credentials(shared_data)
+        user_name, password = self._get_credentials(service, shared_data)
 
         certs_data = service.get_client_auth_certs()
         if not certs_data:

cloudbaseinit/tests/plugins/windows/test_winrmcertificateauth.py

@@ -23,6 +23,7 @@ except ImportError:
 from cloudbaseinit import exception
 from cloudbaseinit.plugins.common import base
 from cloudbaseinit.plugins.common import constants
+from cloudbaseinit.tests import testutils
 
 
 class ConfigWinRMCertificateAuthPluginTests(unittest.TestCase):
@@ -51,35 +52,41 @@ class ConfigWinRMCertificateAuthPluginTests(unittest.TestCase):
     def tearDown(self):
         self._module_patcher.stop()
 
-    def _test_get_credentials(self, fake_user, fake_password):
-        mock_shared_data = mock.MagicMock()
-        mock_shared_data.get.side_effect = [fake_user, fake_password]
-        if fake_user is None or fake_password is None:
-            self.assertRaises(exception.CloudbaseInitException,
-                              self._certif_auth._get_credentials,
-                              mock_shared_data)
-        else:
-            response = self._certif_auth._get_credentials(mock_shared_data)
-            expected = [mock.call(constants.SHARED_DATA_USERNAME),
-                        mock.call(constants.SHARED_DATA_PASSWORD)]
-            self.assertEqual(expected, mock_shared_data.get.call_args_list)
+    @testutils.ConfPatcher('username', '')
+    def test_get_credentials_no_username(self):
+        with self.assertRaises(exception.CloudbaseInitException) as cm:
+            self._certif_auth._get_credentials(mock.sentinel.service, {})
 
-            mock_shared_data.__setitem__.assert_called_once_with(
-                'admin_password', None)
+        expected_message = (
+            "Cannot execute plugin as the username has not been set in "
+            "the plugins shared data, nor it was found in config file.")
+        self.assertEqual(expected_message, str(cm.exception))
 
-            self.assertEqual((fake_user, fake_password), response)
+    def test_get_credentials_no_password(self):
+        mock_service = mock.Mock()
+        mock_service.get_admin_password.return_value = None
 
-    def test_test_get_credentials(self):
-        self._test_get_credentials(fake_user='fake user',
-                                   fake_password='fake password')
+        with self.assertRaises(exception.CloudbaseInitException) as cm:
+            self._certif_auth._get_credentials(mock_service, {})
 
-    def test_test_get_credentials_no_user(self):
-        self._test_get_credentials(fake_user=None,
-                                   fake_password='fake password')
+        expected_message = (
+            "Cannot execute plugin as the password has not been set "
+            "in the plugins shared data, nor it was retrieved "
+            "from the metadata service.")
+        self.assertEqual(expected_message, str(cm.exception))
+        mock_service.get_admin_password.assert_called_once_with()
 
-    def test_test_get_credentials_no_password(self):
-        self._test_get_credentials(fake_user='fake user',
-                                   fake_password=None)
+    def test_get_credentials_get_admin_password(self):
+        mock_service = mock.Mock()
+        mock_service.get_admin_password.return_value = mock.sentinel.password
+        shared_data = {constants.SHARED_DATA_USERNAME: mock.sentinel.username}
+
+        result = self._certif_auth._get_credentials(mock_service, shared_data)
+
+        self.assertIsNone(shared_data[constants.SHARED_DATA_PASSWORD])
+        self.assertEqual((mock.sentinel.username, mock.sentinel.password),
+                         result)
+        mock_service.get_admin_password.assert_called_once_with()
 
     @mock.patch('cloudbaseinit.plugins.windows.winrmcertificateauth'
                 '.ConfigWinRMCertificateAuthPlugin._get_credentials')
@@ -127,7 +134,8 @@ class ConfigWinRMCertificateAuthPluginTests(unittest.TestCase):
             self.assertEqual(expected_set_token_calls,
                              set_uac_rs.call_args_list)
 
-            mock_get_credentials.assert_called_once_with('fake data')
+            mock_get_credentials.assert_called_once_with(
+                mock_service, 'fake data')
             mock_import_cert.assert_called_once_with(
                 cert_data, store_name=self.winrmcert.x509.STORE_NAME_ROOT)