Category:OWASP PHP AntiXSS Library Project

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Revision as of 13:07, 23 April 2007 by Bjfield (Talk | contribs)

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Introduction

AntiXSS is a class for use with PHP 5+ that helps to reduce XSS (cross-site scripting) vulnerabilities by automatically encoding output to behave only as intended.

Requirements

  • PHP5 and above
  • mb_string PHP extension

Installation

  1. Make sure the mb_string extension is available with your PHP installation. If you are using Apache on Windows, this can most likely be done by adding (or un-commenting) a line in your php.ini file. On other platforms, you may need to recompile PHP. See [1] for more information.
  2. To make the code available to your program, include the owasp.antixss.php file, using a line like this: require_once "/path/to/owasp.antixss.php";
  3. It is not necessary to instantiate the class, though you may if you wish. Instead, make calls using the Scope Resolution Operator (::), like this: echo AntiXSS::HTMLEncode($myOutput);

Examples

HTML

Hello, <php echo AntiXSS:HTMLEncode($nameOfMyUser); ?>!

JavaScript

... alert(myFunction('<?php echo AntiXSS:JavaScriptEncode($myVariable); ?>'); ...

URL

... http://example.com/myscript.php?<?php echo AntiXSS::URLEncode($myQueryStringValue); ?> ...

XML

<myelement myattribute="<?php echo AntiXSS::XMLAttributeEncode($myAttributeValue); ?>"><?php echo AntiXSS::XMLEncode($myElementValue); ?></myelement >


Downloads

  • owasp.antixss.php
  • demo.owasp.antixss.php

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