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POProblems implementing ValidatingAntiForgeryToken attribute for Web API with MVC 4 RC
 

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  1. POProblems implementing ValidatingAntiForgeryToken attribute for Web API with MVC 4 RC
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    <p>I'm making JSON-based AJAX requests and, with MVC controllers have been very grateful to Phil Haack for his <a href="http://haacked.com/archive/2011/10/10/preventing-csrf-with-ajax.aspx" rel="nofollow noreferrer">Preventing CSRF with AJAX</a> and, Johan Driessen's <a href="http://johan.driessen.se/posts/Updated-Anti-XSRF-Validation-for-ASP.NET-MVC-4-RC" rel="nofollow noreferrer">Updated Anti-XSRF for MVC 4 RC</a>. But, as I transition API-centric controllers to Web API, I'm hitting issues where the functionality between the two approaches is markedly different and I'm unable to transition the CSRF code.</p> <p>ScottS raised a similar <a href="https://stackoverflow.com/questions/11476883/web-api-and-validateantiforgerytoken">question</a> recently which was <a href="https://stackoverflow.com/a/11483099/609290">answered</a> by Darin Dimitrov. Darin's solution involves implementing an authorization filter which calls AntiForgery.Validate. Unfortunately, this code does not work for me (see next paragraph) and - honestly - is too advanced for me.</p> <p>As I understand it, Phil's solution overcomes the problem with MVC AntiForgery when making JSON requests in the absence of a form element; the form element is assumed/expected by the AntiForgery.Validate method. I <em>believe</em> that this may be why I'm having problems with Darin's solution too. I receive an HttpAntiForgeryException "The required anti-forgery form field '__RequestVerificationToken' is not present". I am certain that the token is being POSTed (albeit in the header per Phil Haack's solution). Here's a snapshot of the client's call:</p> <pre><code>$token = $('input[name=""__RequestVerificationToken""]').val(); $.ajax({ url:/api/states", type: "POST", dataType: "json", contentType: "application/json: charset=utf-8", headers: { __RequestVerificationToken: $token } }).done(function (json) { ... }); </code></pre> <p>I tried a hack by mashing together Johan's solution with Darin's and was able to get things working but am introducing HttpContext.Current, unsure whether this is appropriate/secure and why I can't use the provided HttpActionContext.</p> <p>Here's my inelegant mash-up.. the change is the 2 lines in the try block:</p> <pre><code>public Task&lt;HttpResponseMessage&gt; ExecuteAuthorizationFilterAsync(HttpActionContext actionContext, CancellationToken cancellationToken, Func&lt;Task&lt;HttpResponseMessage&gt;&gt; continuation) { try { var cookie = HttpContext.Current.Request.Cookies[AntiForgeryConfig.CookieName]; AntiForgery.Validate(cookie != null ? cookie.Value : null, HttpContext.Current.Request.Headers["__RequestVerificationToken"]); } catch { actionContext.Response = new HttpResponseMessage { StatusCode = HttpStatusCode.Forbidden, RequestMessage = actionContext.ControllerContext.Request }; return FromResult(actionContext.Response); } return continuation(); } </code></pre> <p>My questions are:</p> <ul> <li>Am I correct in thinking that Darin's solution assumes the existence of a form element?</li> <li>What's an elegant way to mash-up Darin's Web API filter with Johan's MVC 4 RC code?</li> </ul> <p>Thanks in advance!</p>
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