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Re: Anti-Forgery Tokens using MVC, Web API and AngularJS

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Dec 08, 2015 08:19 PMeriksendcLINK

Yes it happening because the Request is authenticated yet it expects an anonymous request so it can try to sign in whoever the user is. If you redirect back to the log in page, a fresh copy of the anti forgery token will be used and this would be treated as an anonymous request. Apr 17, 2017  On the ASP.NET Core side, you need to push the Anti-forgery token to a cookie with the name specified above. To do that you need to create a middleware that will be able to append it to your SPA. Here’s a class implementing the middleware along with the method extension to be able to use it.

Hi Brock,

Thanks for pointing me there. Looking through the source definitely helped me out. I've been able to adapt the older code / pattern I'd found to use the latest vNext codebase.

If you have time to skim the following, wondering if you or anyone would have any insight / opinion on the following:

I'm using the following code now to generate both the cookie token and the form token (as the old code did):

I use the extension method to add an attribute where my angular code can get at it:

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Quicktime mac avi codec download. I then send back the value of the [generated] ncg-request-verification-token attribute and validate it using this:

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Finally, the web application I'm writing is a new one generated with RC1 code, and I've incorporated ASP.NET Identity.

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So. two weird observations: Mac generate ssh key pair.

1. If I render the page that is using this code, and the user is not signed in, then both the cookie token and form token exist, but the validation fails.
2. If I render the page that is using this code and the user _is_ signed in, then the cookie token retrieved by antiforgery.GetTokens(helper.ViewContext.HttpContext); is an empty string. Without it validation fails.
3. I dug into the cookies that were existing, and I found a cookie with a very machine-generated-looking name. When I took that cookie's value and validated it with the form token (in case 2) then validation succeeded. This led me to learn about setting the antiforgery cookie name deterministically to AntiforgeryCookie, so that I had a cookie to deterministically look for.

I'm a little bit confused about what might have changed from ASP.NET 4 to ASP.NET 5 that would change the way the antiforgery cookie is generated. It doesn't seem to work the way it used to.

That being said, I'm curious about the entire solution that the previous authors proposed. Should both the form token _and_ the cookie token be concatenated and then sent back, parsed and validated? It seems like the pattern should be:

1. Generate the AntiforgeryTokenSet, but only put the FormToken value into the DOM of the generated page.
2. Take the FormToken from the DOM of the generated page and pass it in a custom header to the Web API call being protected.
3. In the implementation of the attribute decorating the Web API method, pull the form token from the custom header, and pull the cookie token from the cookie and validate.

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I know this is quite a bit. Really appreciate it if you do take the time to skim through and comment. I feel like I've got a fairly good handle on this but just wanted to be sure I got an expert opinion!

Thanks! :)

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-Brian Eriksen