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using System;
 
using System.Runtime.InteropServices; // DllImport
using System.Security.Principal; // WindowsImpersonationContext
using System.Security.Permissions; // PermissionSetAttribute
 
	public class Impersonation
	{
 
		public const int LOGON32_LOGON_INTERACTIVE = 2;
		public const int LOGON32_PROVIDER_DEFAULT = 0;
 
		WindowsImpersonationContext impersonationContext;
 
		[DllImport("advapi32.dll", CharSet=CharSet.Auto)]
		public static extern int LogonUser(String lpszUserName,
			String lpszDomain,
			String lpszPassword,
			int dwLogonType,
			int dwLogonProvider,
			ref IntPtr phToken);
 
		[DllImport("advapi32.dll", CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
		public extern static int DuplicateToken(IntPtr hToken,
			int impersonationLevel,
			ref IntPtr hNewToken);
 
		public Impersonation()
		{
		}
 
		public bool impersonateValidUser(String userName, String domain, String password)
		{
			WindowsIdentity tempWindowsIdentity;
			IntPtr token = IntPtr.Zero;
			IntPtr tokenDuplicate = IntPtr.Zero;
 
			if(LogonUser(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
				LOGON32_PROVIDER_DEFAULT, ref token) != 0)
			{
				if(DuplicateToken(token, 2, ref tokenDuplicate) != 0)
				{
					tempWindowsIdentity = new WindowsIdentity(tokenDuplicate);
					impersonationContext = tempWindowsIdentity.Impersonate();
 
					if (impersonationContext != null)
						return true;
					else
						return false;
				}
				else
					return false;
			}
			else
				return false;
		}
 
		public void undoImpersonation()
		{
			impersonationContext.Undo();
		}
	} | 
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