How do I solve an AntiForgeryToken exception that occurs after an iisreset in my ASP.Net MVC app?

I’m having problems with the AntiForgeryToken in ASP.Net MVC. If I do an iisreset on my web server and a user continues with their session they get bounced to a login page. Not terrible but then the AntiForgery token blows up and the only way to get going again is to blow away the cookie on the browser.

With the beta version of version 1 it used to go wrong when reading the cookie back in for me so I used to scrub it before asking for a validation token but that was fixed when it was released.

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For now I think I’ll roll back to my code that fixed the beta problem but I can’t help but think I’m missing something. Is there a simpler solution, heck should I just drop their helper and create a new one from scratch? I get the feeling that a lot of the problem is the fact that it’s tied so deeply into the old ASP.Net pipeline and is trying to kludge it into doing something it wasn’t really designed to do.

I had a look in the source code for the ASP.Net MVC 2 RC and it doesn't look like the code has changed much so while I haven't tried it, I don't think there are any answers there.

Here is the relevant part of the stack trace of the exception.

Edit: I just realised I didn't mention that this is just trying to insert the token on the GET request. This isn't the validation that occurs when you do a POST kicking off.

System.Web.Mvc.HttpAntiForgeryException: A required anti-forgery token was not
supplied or was invalid.
---> System.Web.HttpException: Validation of viewstate MAC failed. If this 
application is hosted by a Web Farm or cluster, ensure that <machineKey> 
configuration specifies the same validationKey and validation algorithm. 
AutoGenerate cannot be used in a cluster.
---> System.Web.UI.ViewStateException: Invalid viewstate. 
  Client IP: 127.0.0.1
  Port: 4991
  User-Agent: scrubbed
  ViewState: scrubbed
  Referer: blah
  Path: /oursite/Account/Login
---> System.Security.Cryptography.CryptographicException: Padding is invalid and
cannot be removed.
at System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast)
at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount)
at System.Security.Cryptography.CryptoStream.FlushFinalBlock()
at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo)
at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString)
--- End of inner exception stack trace ---
--- End of inner exception stack trace ---
at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
at System.Web.UI.ViewStateException.ThrowMacValidationError(Exception inner, String persistedState)
at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString)
at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState)
at System.Web.Mvc.AntiForgeryDataSerializer.Deserialize(String serializedToken)
--- End of inner exception stack trace ---
at System.Web.Mvc.AntiForgeryDataSerializer.Deserialize(String serializedToken)
at System.Web.Mvc.HtmlHelper.GetAntiForgeryTokenAndSetCookie(String salt, String domain, String path)
at System.Web.Mvc.HtmlHelper.AntiForgeryToken(String salt, String domain, String path)

---

If your MachineKey is set to AutoGenerate, then your verification tokens, etc won't survive an application restart - ASP.NET will generate a new key when it starts up, and then won't be able to decrypt the tokens correctly.

If you are seeing this a lot, I'd suggest:

1. Configuring a static MachineKey (you should be able to do this at the application level), see "How to: Configure a MachineKey" for more information
2. Try not to perform IIS Resets when the site is being used¹

¹ The best way to do this is by having a loadbalanced application, which will require you to set a static MachineKey. Another option is to take the site down by placing a file named app_offline.htm in the root of the site, which will take the site offline and display your message - at least the users will expect things to go wrong.

---

For now I've gone with a solution that scrubs the cookie if the exception is thrown. If the exception is thrown again I'll just let it happen as it was.

I won't mark this as 'the' answer for now in the hope that someone has a better answer.

public static class MyAntiForgeryExtensions
{
    // Methods
    public static string MyAntiForgeryToken(this HtmlHelper helper)
    {
        return MyAntiForgeryToken(helper, null);
    }

    public static string MyAntiForgeryToken(this HtmlHelper helper, string salt)
    {
        string fragment;
        string path = helper.ViewContext.HttpContext.Request.ApplicationPath;
        try
        {
            fragment = helper.AntiForgeryToken(salt, null, path);
        }
        catch (HttpAntiForgeryException)
        {
            // okay, scrub the cookie and have another go.
            string cookieName = GetAntiForgeryTokenName(path);
            helper.ViewContext.HttpContext.Request.Cookies.Remove(cookieName);
            fragment = helper.AntiForgeryToken(salt, null, path);
        }
        return fragment;
    }

    #region AntiForgeryData code that shouldn't be sealed
    // Copied from AntiForgeryData since they aren't accessible.
    internal static string GetAntiForgeryTokenName(string appPath) {
        if (String.IsNullOrEmpty(appPath)) {
            return "__RequestVerificationToken";
        }
        else {
            return "__RequestVerificationToken_" + Base64EncodeForCookieName(appPath);
        }
    }
    private static string Base64EncodeForCookieName(string s) {
        byte[] rawBytes = Encoding.UTF8.GetBytes(s);
        string base64String = Convert.ToBase64String(rawBytes);

        // replace base64-specific characters with characters that are safe for a cookie name
        return base64String.Replace('+', '.').Replace('/', '-').Replace('=', '_');
    }
    #endregion
}

---

i had this issue and to fix what you need to do is add an explicit machine key in your web-config...

<machineKey validationKey="D82960E6B6E9B9029D4CAB2F597B5B4AF631E3C182670855D25FBDE1BFAFE19EFDE92ABBD1020FC1B2AE455D5B5F8D094325597CE1A7F8B15173407199C85A16" decryptionKey="577404C3A13F154908D7A5649EEC8D7C8A92C35A25A3EC078B426BB09D426A71" validation="SHA1" decryption="AES" /> 

ensure its placed in web.config within...

<system.web>

---

You can add AntiForgeryConfig.SuppressIdentityHeuristicChecks = true; into global.asax

protected void Application_Start() {
    AntiForgeryConfig.SuppressIdentityHeuristicChecks = true;
}

---

If I do an iisreset on my web server and a user continues with their session they get bounced to a login page.

There's no reason an iisreset to bring the user to the login page. If you use cookies to track authentication information and have a stateless application, the user should stay authenticated even after a server reboot (of course if a request is made during the reset it will fail).

---

Actually I found this to work in my logon action:

    public ActionResult LogOn()
    {
        formsAuthentication.SignOut();

        Response.Cookies.Clear();

        Session[SessionKeys.USER_SESSION_KEY] = null;
        Session.Clear();
        Session.Abandon();


        return View();
    }

The important part was : Response.Cookies.Clear();