I need to write a small service that runs an application (with gui, e.g. calc.exe) on the logon-screen.
I already found this question (and answer): Running a process at the Windows 7 Welcome Screen
please read the code-comments if you don't understand how this works:
// grab the winlogon process
Process winLogon = null;
foreach (Process p in Process.GetProcesses())
{
if (p.ProcessName.Contains("winlogon"))
{
winLogon = p;
break;
}
}
// grab the winlogon's token
IntPtr userToken = IntPtr.Zero;
if (!OpenProcessToken(winLogon.Handle, TOKEN_QUERY | TOKEN_IMPERSONATE | TOKEN_DUPLICATE, out userToken))
{
log("ERROR: OpenProcessToken returned false - " + Marshal.GetLastWin32Error());
}
// create a new token
IntPtr newToken = IntPtr.Zero;
SECURITY_ATTRIBUTES tokenAttributes = new SECURITY_ATTRIBUTES();
tokenAttributes.nLength = Marshal.SizeOf(tokenAttributes);
SECURITY_ATTRIBUTES threadAttributes = new SECURITY_ATTRIBUTES();
threadAttributes.nLength = Marshal.SizeOf(threadAttributes);
// duplicate the winlogon token to the new token
if (!DuplicateTokenEx(userToken, 0x10000000, ref tokenAttributes, SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation,
TOKEN_TYPE.TokenImpersonation, out newToken))
{
log("ERROR: DuplicateTokenEx returned false - " + Marshal.GetLastWin32Error());
}
TOKEN_PRIVILEGES tokPrivs = new TOKEN_PRIVILEGES();
tokPrivs.PrivilegeCount = 1;
LUID seDebugNameValue = new LUID();
if (!LookupPrivilegeValue(null, SE_DEBUG_NAME, out seDebugNameValue))
{
log("ERROR: LookupPrivilegeValue returned false - " + Marshal.GetLastWin32Error());
}
tokPrivs.Privileges = new LUID_AND_ATTRIBUTES[1];
tokPrivs.Privileges[0].Luid = seDebugNameValue;
tokPrivs.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
// escalate the new token's privileges
if (!AdjustTokenPrivileges(newToken, false, ref tokPrivs, 0, IntPtr.Zero, IntPtr.Zero))
{
log("ERROR: AdjustTokenPrivileges returned false - " + Marshal.GetLastWin32Error());
}
PROCESS_INFORMATION pi = new PROCESS_INFORMATION();
STARTUPINFO si = new STARTUPINFO();
si.cb = Marshal.SizeOf(si);
si.lpDesktop = "Winsta0\\Winlogon";
// start the process using the new token
if (!CreateProcessAsUser(newToken, "calc.exe", null, ref tokenAttributes, ref threadAttributes,
true, (uint)CreateProcessFlags.CREATE_NEW_CONSOLE | (uint)CreateProcessFlags.INHERIT_CALLER_PRIORITY, IntPtr.Zero,
"C:\\Windows\\System32", ref si, out pi))
{
log("ERROR: CreateProcessAsUser returned false - " + Marshal.GetLastWin32Error());
}
Process _p = Process.GetProcessById(pi.dwProcessId);
if (_p != null)
{
log("Process " + _p.Id + " Name " + _p.ProcessName);
}
else
{
log("Process not found");
}
It works with Windows 7. With XP I get error 1349 ERROR_BAD_TOKEN_TYPE
while calling CreateProcessAsUser
(MSDN: The type of the token is inappropriate for its attempted use.).
How to realize this in Windows XP? It does not have to be the code from above but it should work as a service (with system-account?).
Thanks for your support Fluxer