Dynamic Taint Analysis in JavaScript

Homepage: http://tarunchaudhry.com/jsTaint

Basic Usage:
<script type="text/javascript" src="basic-taint.js"></script>
<script type="text/javascript" src="tainting2-optimized.js"></script>
var tainting = new Taint([<ID of form element to get>],[<Validate Functions>],[<Sync Functions>]);

<input type="text" size="12" maxlength="36" id="fname">

var fname = tainting.get("fname");
fname.isTainted();
fname.unTaint();
fname.taint();
fname = tainting.runValidation("fname", fname);
tainting.runSync("fname",fname);
For more detailed examples, please visit http://tarunchaudhry.com/jsTaint

Taint checking is a feature in some computer programming languages, such as Perl
and Ruby, designed to increase security by preventing malicious users from
executing commands on a host computer. Taint checks highlight specific security
risks primarily associated with web sites which are attacked using techniques
such as SQL injection or buffer overflow attack approaches.

The concept behind taint checking is that any variable that can be modified by 
an outside user (for example a variable set by a field in a web form) poses a 
potential security risk. If that variable is used in an expression that sets a 
second variable, that second variable is now also suspicious.

With the proliferation of web applications, it is necessary to validate all user
input before using it on the server. If this doesn't happen, servers can easily 
be compromised. Although all validataion of user input needs to happen on the 
server, most applications do some basic validation on the user-side using 
JavaScript. Furthurmore, most web applications ara JavaScript extensive and have
hundreds, if not thousands, of variables. JsTaint is a library which implements
Dynamic Taint Analysis in JavaScript.

Homepage: http://tarunchaudhry.com/jsTaint

Code is Copyright (c) 2011 Tarun Chaudhry

LICENSE:
GNU GPL v3
See LICENSE.txt