// (c) 2006 Richard Grimes
// www.grimes.demon.co.uk

using System;
using System.Threading;
using System.Security.Principal;
using System.Security.Permissions;

class App
{
   static void Main()
   {
      AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
      Thread.CurrentPrincipal = new MyPrincipal("Richard", "NTLM", true);
      try
      {
         Console.WriteLine("called OnlyAdministrators");
         OnlyAdministrators();
      }
      catch (Exception)
      {
         Console.WriteLine("failed");
      }
   }
   [PrincipalPermission(SecurityAction.Demand, Role=@"BUILTIN\Administrators")]
   static void OnlyAdministrators()
   {
      Console.WriteLine("OnlyAdministrators called");
   }
}

class MyPrincipal : IPrincipal, IIdentity
{
   string name;
   string auth;
   bool isAuth;

   public MyPrincipal(string name, string auth, bool isAuth)
   {
      this.name = name;
      this.auth = auth;
      this.isAuth = isAuth;
   }
   public IIdentity Identity
   {
      get { return this; }
   }
   public bool IsInRole(string role)
   {
      return true;
   }
   public string AuthenticationType
   {
      get { return auth; }
   }
   public bool IsAuthenticated
   {
      get { return isAuth; }
   }
   public string Name
   {
      get { return name; }
   }
}