How does antiforgerytoken work

I found this really useful but I needed to add AntiForgeryConfig. NameIdentifier; to my global. Others might find this useful to know. Hi, I have added Antiforgery token scripts in both server action and CS javascript as well. For an anonymous hacker, yes, it can block the requests by anti-forgery token that is missing. Being a hacker, he can also add Anti-forgery token on his script as well, right? And how are they stored?

The short version is that a generated token is stored in 2 places: a cookie b hidden form value. When the form is submitted, these 2 values are compared against each other to determine if they are valid.

For further reading:. The above description is not all what is done, in case of AjaxRequest the antiforgery, specifically in get requests, will not usually send the Form with the hidden value for comparison, instead you will need to set a header value with the same content of the cookie via javascript.. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. NET validate anti-forgery token Ask Question. Asked 6 years, 11 months ago. Active 3 years, 10 months ago. Viewed 31k times. Improve this question. To prevent CSRF attacks, use anti-forgery tokens with any authentication protocol where the browser silently sends credentials after the user logs in. This includes cookie-based authentication protocols, such as forms authentication, as well as protocols such as Basic and Digest authentication.

To add the anti-forgery tokens to a Razor page, use the HtmlHelper. AntiForgeryToken helper method:. One solution is to send the tokens in a custom HTTP header. The following code uses Razor syntax to generate the tokens, and then adds the tokens to an AJAX request. The tokens are generated at the server by calling AntiForgery. When you process the request, extract the tokens from the request header.

Then call the AntiForgery. Validate method to validate the tokens. Thus, if a user inputs data into an untrusted site, which then posts back to our site, the anti-forgery token on the page will not match the one previously created and stored in the cookie.

When MVC smells something fishy, it throws an exception, protecting our user from an attack. Twitter Github. Andrew Thomas Another Tech Blog. Blog About Contact. AntiForgeryToken and how does it actually work?