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

<?php

if (is_numeric($vars['id'])) {
    $service = dbFetchRow('SELECT * FROM services WHERE service_id = ?', array($vars['id']));

    if (is_numeric($service['device_id']) && ($auth || device_permitted($service['device_id']))) {
        $device = device_by_id_cache($service['device_id']);

        // This doesn't quite work for all yet.
        $rrd_filename = $config['rrd_dir'].'/'.$device['hostname'].'/'.safename('service-'.$service['service_type'].'-'.$service['service_id'].'.rrd');

        $title  = generate_device_link($device);
        $title .= ' :: Service :: '.htmlentities($service['service_type']);
        $auth   = true;
    }
}