Why getting WindowsPrinciple in AuthorisationManager in asp.net

Question

I am trying to implement claim based security in web application. I have a class like.

public class AuthorisationManager : ClaimsAuthorizationManager
{
    public override bool CheckAccess(AuthorizationContext context)
    {
        //if (context.Principal.Identity.IsAdmin())
        //    return true;
        var resource = context.Resource.First().Value;
        var action = context.Action.First().Value;
        return context.Principal.HasClaim(resource, action);
    }
    public override void LoadCustomConfiguration(System.Xml.XmlNodeList nodelist)
    {
        base.LoadCustomConfiguration(nodelist);
    }
}

and I have CustomPrinciple like

 public class CustomPrinciple  : ClaimsPrincipal
{
    public CustomPrinciple(IIdentity identity)
        : base(identity)
    {
    }
}

Its always returning false because context.Principal is WindowsPrinciple. I tried to set it in Globas.asax.cs like

 protected void Application_PostAuthenticateRequest(Object sender, EventArgs e)
    {
        HttpCookie authCookie = Request.Cookies[FormsAuthentication.FormsCookieName];

        if (authCookie != null)
        {
            FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(authCookie.Value);

            PermissionManager mgr = new PermissionManager();
            mgr.CheckUserAccess("", "");
            mgr.LoadPermissionModel("XYZ");

            HttpContext.Current.User = mgr.LoadPermissionModel("ABC");
            Thread.CurrentPrincipal = HttpContext.Current.User;
            AppDomain.CurrentDomain.SetThreadPrincipal(Thread.CurrentPrincipal);
        }
    }

How can I change it so that I can get the CustomPrinciple in CheckAccess(AuthorizationContext context)

Thanks

Answer 1

(The suggested answer to be accepted):

I guess you have <authorization mode="Windows"> in your web.config instead of Forms or None (both should work with claims based auth).