RT#792178: Configure cas_cert variable

drupal-settings.php

@@ -73,6 +73,10 @@ $conf['scheduler_date_popup_minute_increment'] = 15;
 $conf['update_check_disabled'] = TRUE;
 $conf['update_notify_emails'] = NULL;
 $conf['cas_domain'] = 'uwaterloo.ca';
+// If cas_cert is not set, the TLS certificate of the CAS server will not be checked.
+if (is_file('/etc/pki/tls/certs/ca-bundle.crt')) {
+  $conf['cas_cert'] = '/etc/pki/tls/certs/ca-bundle.crt';
+}
 $conf['site_403'] = 'customerror/403';
 $conf['site_404'] = 'customerror/404';
 $conf['site_default_country'] = 'CA';