This file is indexed.

/usr/share/squirrelmail/plugins/lockout/index.php is in squirrelmail-lockout 1.7-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?php

/**
 * index.php
 *
 * This file simply takes any attempt to view source files and sends those
 * people to the login screen. At this point no attempt is made to see if the
 * person is logged in or not.
 *
 * @copyright 1999-2010 The SquirrelMail Project Team
 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
 * @version $Id: index.php 13893 2010-01-25 02:47:41Z pdontthink $
 * @package plugins
 */

header('Location: ../index.php');