diff --git a/med/admin.py b/med/admin.py
index e97205b..b3662bd 100644
--- a/med/admin.py
+++ b/med/admin.py
@@ -3,6 +3,8 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django.contrib.admin import AdminSite
+from django.contrib.auth.admin import Group, GroupAdmin
+from django.contrib.sites.admin import Site, SiteAdmin
 from django.utils.translation import gettext_lazy as _
 from django.views.decorators.cache import never_cache
 
@@ -25,5 +27,14 @@ class DatabaseAdmin(AdminSite):
 
         return response
 
+    def has_permission(self, request):
+        """
+        Authorize all active user to access admin
+        """
+        return request.user.is_active
 
+
+# Instantiate admin site and register some defaults
 admin_site = DatabaseAdmin()
+admin_site.register(Group, GroupAdmin)
+admin_site.register(Site, SiteAdmin)