Write a thin wrapper around the standard Django auth backend

awx/main/backends.py

@@ -0,0 +1,14 @@
+import logging
+
+from django.conf import settings
+from django.contrib.auth.backends import ModelBackend
+
+logger = logging.getLogger('awx.main.backends')
+
+
+class AWXModelBackend(ModelBackend):
+    def authenticate(self, request, **kwargs):
+        if settings.DISABLE_LOCAL_AUTH:
+            logger.warning(f"User '{kwargs['username']}' attempted login through the disabled local authentication system.")
+            return
+        return super().authenticate(request, **kwargs)