Set default authentication backend on user for django.contrib.auth.login

.gitignore

@@ -2,5 +2,5 @@
 *~
 *.egg-info/
 .idea/
-.project/
-.pydevproject/
+.project
+.pydevproject

ssoauth/app_settings/defaults.py

 import os
 from django import urls
+from django.conf import settings as django_settings
 
 
 """
@@ -86,3 +87,5 @@ SP_ORGANIZATION = {
         "url": "https://www.hs-hannover.de",
     },
 }
+
+DEFAULT_AUTH_BACKEND = django_settings.AUTHENTICATION_BACKENDS[0]

ssoauth/views.py

@@ -177,6 +177,7 @@ class ACSAuthNView(SAMLMixin, View):
         )
         auth_utils.cleanup_direct_permissions(user=user)
         auth_utils.set_user_compat_flags(user=user)
+        user.backend = app_settings.DEFAULT_AUTH_BACKEND
         request.user = user
         contrib_auth.login(request, user)
         logger.debug("Logged in {user}".format(**locals()))
@@ -296,6 +297,7 @@ class DevView(FormView):
             except exceptions.ObjectDoesNotExist:
                 import uuid
                 user = auth_utils.get_or_create_user(username=log_in_as_username, uuid=uuid.uuid4())
+            user.backend = app_settings.DEFAULT_AUTH_BACKEND
             self.request.user = user
             contrib_auth.login(request=self.request, user=user)
         elif toggle_group: