How to add antiforgery token for AJAX call in MVC applicationRSS

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  NetCurious

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  How to add antiforgery token for AJAX call in MVC application

  Jun 14, 2019 02:00 PM|NetCurious|LINK

  I'm trying mitigate CSRF issues for MVC application but facing issues while adding anti forgery token in following code in cshtml. Tried searching around but no concrete solution found.

  Would appreciate any help..

   <td class="ignoreClick">
                      
                              @Ajax.ActionLink(
                                                  "Delete","DeleteStudent","RqstProcessor",
                                                  new
                                                  {                                                    
                                                      id = current.key
                                                  },
                                                  new AjaxOptions
                                                  {
                                                      AllowCache = false,                                                    
                                                      HttpMethod = "POST",
                                                      UpdateTargetId = "StudentList",
                                                      InsertionMode = InsertionMode.Replace,
                                                  },
                                                  new
                                                  {
                                                      @class = "ignoreClick"
                                                  }
                                               )
                      
                      </td>

• • Reply
  Yuki Tao

  Contributor

  3090 Points

  1232 Posts

  Re: How to add antiforgery token for AJAX call in MVC application

  Jun 17, 2019 07:13 AM|Yuki Tao|LINK

  Hi NetCurious,

  This link covers one solution http://tpeczek.com/2010/05/using-antiforgerytoken-with-other-verbs.html

  You could create a form with @Html.AntiForgeryToken() to generate html whose name is __RequestVerificationToken.

  Finally I'm going to write an attribute that inherits from the ValidateAntiForgeryTokenAttribute and that accepts forgery tokens in both the Request.Form and Request.QueryString

  For example:

  In view:

  ...
  @using (Html.BeginForm(null, null, FormMethod.Post))
      {
          @Html.AntiForgeryToken()
      }
  
      @Ajax.ActionLink("Delete","DeleteStudent","Home",new {id = current.key,__RequestVerificationToken = "_" },new System.Web.Mvc.Ajax.AjaxOptions
      {
          AllowCache = false,
          HttpMethod = "POST",
          UpdateTargetId = "StudentList",
          InsertionMode = InsertionMode.Replace
      },new{@class = "ignoreClick"})
  
  ...

  change href in <a>:

  <script type="text/javascript">
      $(document).ready(function () {
          //Finding AntiForgeryToken input
          var antiForgeryToken = $('input[name=__RequestVerificationToken]');
          if (antiForgeryToken.length > 0) {
              //Serializing AntiForgeryToken
              var antiForgeryTokenSerialized = antiForgeryToken.serialize();
              //For each anchor in page
              $('a.ignoreClick').each(function (index, element) {
                  //Replace placeholder with serialized AntiForgeryToken
                  $(element).attr('href', $(element).attr('href').replace('__RequestVerificationToken=_', antiForgeryTokenSerialized));
              });
          }
      });
  </script>

  in controller:

    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
          public sealed class ValidateAjaxAntiForgeryTokenAttribute : FilterAttribute, IAuthorizationFilter
          {
              public void OnAuthorization(AuthorizationContext filterContext)
              {
                  if (filterContext == null)
                  {
                      throw new ArgumentNullException("filterContext");
                  }
  
                  var httpContext = filterContext.HttpContext;
                  var cookie = httpContext.Request.Cookies[AntiForgeryConfig.CookieName];
                  AntiForgery.Validate(cookie != null ? cookie.Value : null, filterContext.HttpContext.Request.QueryString["__RequestVerificationToken"]);
              }
          }

          [HttpPost]
          [ValidateAjaxAntiForgeryToken]
          public ActionResult DeleteStudent(int id)
          {
              ...
          }

  Best Regards.

  Yuki Tao

  MSDN Community Support
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