/usr/share/mediawiki-extensions/base/InputBox/InputBox.php is in mediawiki-extensions-base 3.5~deb7u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
 * InputBox extension
 *
 * @file
 * @ingroup Extensions
 *
 * This file contains the main include file for the Inputbox extension of
 * MediaWiki.
 *
 * Usage: Add the following line in LocalSettings.php:
 * require_once( "$IP/extensions/InputBox/InputBox.php" );
 *
 * @author Erik Moeller <moeller@scireview.de>
 *  namespaces search improvements partially by
 *  Leonardo Pimenta <leo.lns@gmail.com>
 *	Cleaned up by Trevor Parscal <tparscal@wikimedia.org>
 * @copyright Public domain
 * @license Public domain
 * @version 0.1.4
 */
// Check environment
if ( !defined( 'MEDIAWIKI' ) ) {
	echo( "This is an extension to the MediaWiki package and cannot be run standalone.\n" );
	die( -1 );
}
/* Configuration */
// Credits
$wgExtensionCredits['parserhook'][] = array(
	'path'           => __FILE__,
	'name'           => 'InputBox',
	'author'         => array( 'Erik Moeller', 'Leonardo Pimenta', 'Rob Church', 'Trevor Parscal', 'DaSch' ),
	'version'        => '0.1.4',
	'url'            => 'https://www.mediawiki.org/wiki/Extension:InputBox',
	'description'    => 'Allow inclusion of predefined HTML forms.',
	'descriptionmsg' => 'inputbox-desc',
);
// Shortcut to this extension directory
$dir = dirname( __FILE__ ) . '/';
// Internationalization
$wgExtensionMessagesFiles['InputBox'] = $dir . 'InputBox.i18n.php';
// Register auto load for the special page class
$wgAutoloadClasses['InputBoxHooks'] = $dir . 'InputBox.hooks.php';
$wgAutoloadClasses['InputBox'] = $dir . 'InputBox.classes.php';
// Register parser hook
$wgHooks['ParserFirstCallInit'][] = 'InputBoxHooks::register';
$wgHooks['MediaWikiPerformAction'][] = 'InputBoxHooks::onMediaWikiPerformAction';
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