Keep the last authority from the authenticating authority list

Signed-off-by: Ivan Kanakarakis <[email protected]>

Author: c00kiemon5ter

src/satosa/backends/saml2.py

@@ -404,7 +404,11 @@ def _translate_response(self, response, state):
         authn_context_ref, authenticating_authorities, authn_instant = next(
             iter(response.authn_info()), [None, None, None]
         )
-        authenticating_authority = next(iter(authenticating_authorities), None)
+        authenticating_authority = (
+            authenticating_authorities[-1]
+            if authenticating_authorities
+            else None
+        )
         auth_info = AuthenticationInformation(
             auth_class_ref=authn_context_ref,
             timestamp=authn_instant,