Validates that user-data is b64 encoded.

1 files changed, 13 insertions, 0 deletions

diff --git a/nova/api/openstack/create_instance_helper.py b/nova/api/openstack/create_instance_helper.py
index 483ff4985..019283fdf 100644
--- a/nova/api/openstack/create_instance_helper.py
+++ b/nova/api/openstack/create_instance_helper.py
@@ -138,7 +138,10 @@ class CreateInstanceHelper(object):
             raise exc.HTTPBadRequest(explanation=msg)
 
         zone_blob = server_dict.get('blob')
+
         user_data = server_dict.get('user_data')
+        self._validate_user_data(user_data)
+
         availability_zone = server_dict.get('availability_zone')
         name = server_dict['name']
         self._validate_server_name(name)
@@ -370,6 +373,16 @@ class CreateInstanceHelper(object):
 
         return networks
 
+    def _validate_user_data(self, user_data):
+        """Check if the user_data is encoded properly"""
+        if not user_data:
+            return
+        try:
+            user_data = base64.b64decode(user_data)
+        except TypeError:
+            expl = _('Userdata content cannot be decoded')
+            raise exc.HTTPBadRequest(explanation=expl)
+
 
 class ServerXMLDeserializer(wsgi.XMLDeserializer):
     """