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    <p>I've been working on an HttpModule that basically does what you're looking for. When a FormsAuthenticationCookie and FormsAuthenticatedTicket are generated, before the response is sent to the client (i.e., during the processing of the postback of the Login page/action), all of the details about the cookie &amp; ticket are stored on the server. Also, the UserData from the ticket is moved to the server (if present) and replaced with a salted SHA-512 hash of the other properties in the ticket along with a GUID that serves as a key into the server-side store of the ticket. </p> <p>The validation of the cookie &amp; tickets compares everything the client provided (optionally including their IP address) with all of the properties that were known about them at the time they were issued. If anything doesn't match, they are removed from the request before the FormsAuthenticationModule even kicks in. If everything does match, the server's UserData is stuck back in the FormsAuthTicket in case you had any modules or code that depend on it. It's all transparent. Plus, it can detect suspicious and blatantly malicious requests and inserts a random delay in the processing. It also has some explicit padding oracle workarounds in there. </p> <p>The demo app actually lets you create/modify your cookie &amp; ticket values on the server, with the server encrypting your ticket for you with the machine keys. This way you can prove to yourself that you can't create a ticket/cookie that gets around the server validation unless you write the exact set of data to the server (which should be impossible under normal circumstances).</p> <ul> <li><a href="http://sws.codeplex.com/" rel="nofollow">http://sws.codeplex.com/</a></li> <li><a href="http://www.sholo.net/post/2010/09/21/Padding-Oracle-vs-Forms-Authentication.aspx" rel="nofollow">http://www.sholo.net/post/2010/09/21/Padding-Oracle-vs-Forms-Authentication.aspx</a></li> <li><a href="http://www.sholo.net/post/2010/09/22/Sholo-Web-Security-and-the-EnhancedSecurityModule.aspx" rel="nofollow">http://www.sholo.net/post/2010/09/22/Sholo-Web-Security-and-the-EnhancedSecurityModule.aspx</a></li> </ul> <p>-Scott</p>
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    1. POIs there a different way to do ASP.Net forms authentication that's already built and audited?
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