CreateProcessAsUser not working correctly in my experiments - createprocessasuser

Question

I am trying to do the following:
1. I am logged in as Administrator account in my XP with SP2 machine running VS.NET 2005
2. This machine also has another account user1 which is a guest account
3. I am running a program as Administrator, from this program i want to launch a notepad.exe process which will be running under the user1 security context
4. I specifically want to use CreateProcessasUser to do this..
This is the code snipper which will explain what i have been trying..
const string GRANTED_ALL = "10000000";
const int LOGON32_LOGON_INTERACTIVE = 2;
const int LOGON32_LOGON_NETWORK = 3;
const int LOGON32_LOGON_BATCH = 4;
const int LOGON32_LOGON_SERVICE = 5;
const int LOGON32_LOGON_UNLOCK = 7;
const int LOGON32_LOGON_NETWORK_CLEARTEXT = 8;
const int LOGON32_LOGON_NEW_CREDENTIALS = 9;
const int LOGON32_PROVIDER_DEFAULT = 0;
static IntPtr hToken = IntPtr.Zero;
static IntPtr hTokenDuplicate = IntPtr.Zero;
static void Main(string[] args)
{
int last_error = 0;
if(LogonUser("user1",null,"#welcome123",
LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT, out hToken))
{
last_error = Marshal.GetLastWin32Error();
PROCESS_INFORMATION pi = new PROCESS_INFORMATION();
STARTUPINFO si = new STARTUPINFO();
SECURITY_ATTRIBUTES sa = new SECURITY_ATTRIBUTES();
last_error = 0;
last_error = Marshal.GetLastWin32Error();
if(DuplicateTokenEx(hToken,UInt32.Parse(GRANTED_ALL,System.Globalization.NumberStyles.HexNumber),
ref sa,SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation,
TOKEN_TYPE.TokenPrimary,out hTokenDuplicate))
{
last_error = 0;
last_error = Marshal.GetLastWin32Error();
CreateProcessAsUser(hTokenDuplicate, "d:\\san\\notepad.exe", null,
ref sa, ref sa, false, 0, IntPtr.Zero, "d:\\san", ref si, out pi);
last_error = 0;
last_error = Marshal.GetLastWin32Error();
}
}
last_error = 0;
last_error = Marshal.GetLastWin32Error();
if (hToken != IntPtr.Zero) CloseHandle(hToken);
if (hTokenDuplicate != IntPtr.Zero) CloseHandle(hTokenDuplicate);
}
For some reason this is not working..
The DuplicateTokenEx function is returning as error code of 1305 and i cant seem to figure out why..
Instead of DuplicateTokenEx i also used the DuplicateToken, now the CreateProcessAsUser is returning an error code of 1308.
Could someone please throw light on this issue.. This appears to be an apparently very simple thing, but just cant get it right..
[Please note that I specifically want to LogonUser and then DuplicateToken and then CreateProcessAsUSer]

Answer 1

See CreateProcessAsUser() windowstations and desktops.
But I suggest to do it in managed way:
...
using System.Diagnostics;
using System.Security;
...
...
string progPath = #"c:\WINNT\notepad.exe";
ProcessStartInfo startInfo = new ProcessStartInfo(progPath);
startInfo.WindowStyle = ProcessWindowStyle.Normal;
startInfo.UseShellExecute = false;
startInfo.UserName = "SomeUser";
SecureString password = new SecureString();
#region setting password
password.AppendChar('p');
password.AppendChar('a');
...
#endregion
startInfo.Password = password;
Process.Start(startInfo);
...
...