librenms-librenms/html/includes/graphs/smokeping/auth.inc.php

<?php

if (is_numeric($vars['id']) && ($auth || device_permitted($vars['id']))) {
    $device      = device_by_id_cache($vars['id']);
    $title       = generate_device_link($device);
    $graph_title = $device['hostname'];
    $auth        = true;
}