diff --git a/src/sso_server/sso_server/saml/registry.py b/src/sso_server/sso_server/saml/registry.py
index 1dbf43a7508554a3fdab792dbdec9c537f58e038..0f4b8455111ace76fc80c334a70d8a93b25664e9 100644
--- a/src/sso_server/sso_server/saml/registry.py
+++ b/src/sso_server/sso_server/saml/registry.py
@@ -3,7 +3,9 @@ from __future__ import absolute_import
 """
 Registers and loads Processor classes from settings.
 """
+import base64
 import warnings
+import zlib
 
 from importlib import import_module
 
@@ -14,6 +16,7 @@ from .app import saml_app
 
 
 def SSOProcessor(base.Processor):
+    """SAML processor for the Ruby omniauth saml gem."""
 
     def _validate_request(self):
         super(SSOProcessor, self)._validate_request()
@@ -21,7 +24,14 @@ def SSOProcessor(base.Processor):
         if '.autistici.org' not in url:
             raise exceptions.CannotHandleAssertion('ACS is not a supported URL')
 
+    def _decode_request(self):
+        self._request_xml = zlib.decompress(base64.b64decode(self._saml_request), -15)
+
     def _format_assertion(self):
+        # Add attributes that gitlab needs (?).
+        self._assertion_params['ATTRIBUTES'] = {
+            'name': self._subject,
+        }
         self._assertion_xml = xml_render.get_assertion_salesforce_xml(self._assertion_params, signed=True)