/usr/share/doc/php-cas/examples/example_pgt_storage_file.php is in php-cas 1.3.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* Example that changes the storage of the pgt tickets to file
*
* PHP Version 5
*
* @file example_pgt_storage_db.php
* @category Authentication
* @package PhpCAS
* @author Joachim Fritschi <jfritschi@freenet.de>
* @author Adam Franco <afranco@middlebury.edu>
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
* @link https://wiki.jasig.org/display/CASC/phpCAS
*/
// Load the settings from the central config file
require_once 'config.php';
// Load the CAS lib
require_once $phpcas_path . '/CAS.php';
// Enable debugging
phpCAS::setDebug();
// Initialize phpCAS
phpCAS::proxy(CAS_VERSION_2_0, $cas_host, $cas_port, $cas_context);
// For production use set the CA certificate that is the issuer of the cert
// on the CAS server and uncomment the line below
// phpCAS::setCasServerCACert($cas_server_ca_cert_path);
// For quick testing you can disable SSL validation of the CAS server.
// THIS SETTING IS NOT RECOMMENDED FOR PRODUCTION.
// VALIDATING THE CAS SERVER IS CRUCIAL TO THE SECURITY OF THE CAS PROTOCOL!
phpCAS::setNoCasServerValidation();
// set PGT storage to file in plain format in the same directory as session files
phpCAS::setPGTStorageFile(session_save_path());
// force CAS authentication
phpCAS::forceAuthentication();
// at this step, the user has been authenticated by the CAS server
// and the user's login name can be read with phpCAS::getUser().
// moreover, a PGT was retrieved from the CAS server that will
// permit to gain accesses to new services.
?>
<html>
<head>
<title>phpCAS proxy example with PGT storage to file</title>
<link rel="stylesheet" type='text/css' href='example.css'/>
</head>
<body>
<h1>phpCAS proxy example with PGT storage to file</h1>
<?php require 'script_info.php' ?>
<p>the user's login is <b><?php echo phpCAS::getUser(); ?></b>.</p>
<h2>Response from service <?php echo $serviceUrl; ?></h2>
<?php
flush();
// call a service and change the color depending on the result
if ( phpCAS::serviceWeb($serviceUrl, $err_code, $output) ) {
echo '<div class="success">';
} else {
echo '<div class="error">';
}
echo $output;
echo '</div>';
?>
</body>
</html>
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