'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
+)
+
+if 'django_cas' in INSTALLED_APPS:
+    MIDDLEWARE_CLASSES += (
+        'django_cas.middleware.CASMiddleware',
+    )
+
+MIDDLEWARE_CLASSES += (
     'django.contrib.messages.middleware.MessageMiddleware',
     'piwik.django.middleware.PiwikMiddleware',
     # Uncomment the next line for simple clickjacking protection: