private static void EnsureUserSession(int pid, string[] argv)
{
if (WindowsIdentity.GetCurrent().IsSystem)
{
uint targetSessionID = uint.MaxValue;
IntPtr userToken = IntPtr.Zero;
// Retrieves the target process Session ID
try
{
using (Process srcPr = Process.GetProcessById(pid))
{
targetSessionID = (uint)srcPr.SessionId;
}
}
catch (ArgumentException)
{
LogHelper.Warning("Unable to retrieve the target process SessionID. Process may have already exited.");
targetSessionID = uint.MaxValue;
}
// If the target Session ID is still unknown or if it belongs to SYSTEM, or the session doesn't work, the currently active session is retrieved.
if (targetSessionID == uint.MaxValue || targetSessionID == 0 || (!CommonHelper.WTSQueryUserToken(targetSessionID, ref userToken)))
{
targetSessionID = CommonHelper.WTSGetActiveConsoleSessionId();
if (targetSessionID == 0xFFFFFFFF)
{
throw new Exception("No active session found. Aborting.");
}
// If the active Session ID is still a SYSTEM one, cannot continue.
if (targetSessionID == 0)
{
throw new Exception("WFN can not start in the SYSTEM session.");
}
// Because the target Session ID is found, impersonation can take place.
if (!CommonHelper.WTSQueryUserToken(targetSessionID, ref userToken))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Unable to retrieve the current user token.");
}
}
try
{
string argstr = String.Join(" ", argv.Select(a => a.Contains(" ") ? "\"" + a + "\"" : a).ToArray()) + " -impersonated 1";
LogHelper.Debug("Impersonating. Parameters: " + argstr);
Impersonation.LaunchProcessAsUser(Process.GetCurrentProcess().MainModule.FileName, argstr, userToken);
}
finally
{
CloseHandle(userToken);
}
Environment.Exit(0);
}
}