public static void StartAsActiveUser(this Process process)
{
// Sanity check.
if (process.StartInfo == null)
{
throw new InvalidOperationException("The StartInfo property must be defined");
}
if (string.IsNullOrEmpty(process.StartInfo.FileName))
{
throw new InvalidOperationException("The StartInfo.FileName property must be defined");
}
// Retrieve the active session ID and its related user token.
var sessionId = Kernel32.WTSGetActiveConsoleSessionId();
var userTokenPtr = new IntPtr();
if (!WtsApi32.WTSQueryUserToken(sessionId, out userTokenPtr))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
// Duplicate the user token so that it can be used to create a process.
var duplicateUserTokenPtr = new IntPtr();
if (!AdvApi32.DuplicateTokenEx(userTokenPtr, AdvApi32.MAXIMUM_ALLOWED, null, SECURITY_IMPERSONATION_LEVEL.SecurityIdentification, TOKEN_TYPE.TokenPrimary, out duplicateUserTokenPtr))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
// Create an environment block for the interactive process.
var environmentPtr = new IntPtr();
if (!UserEnv.CreateEnvironmentBlock(out environmentPtr, duplicateUserTokenPtr, false))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
// Create the process under the target user’s context.
var processFlags = CREATE_PROCESS_FLAGS.NORMAL_PRIORITY_CLASS | CREATE_PROCESS_FLAGS.CREATE_NEW_CONSOLE | CREATE_PROCESS_FLAGS.CREATE_UNICODE_ENVIRONMENT;
var processInfo = new PROCESS_INFORMATION();
var startupInfo = new STARTUPINFO();
startupInfo.cb = Marshal.SizeOf(startupInfo);
if (!AdvApi32.CreateProcessAsUser
(
duplicateUserTokenPtr,
process.StartInfo.FileName,
process.StartInfo.Arguments,
null,
null,
false,
processFlags,
environmentPtr,
null,
ref startupInfo,
out processInfo
))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
// Free used resources.
Kernel32.CloseHandle(processInfo.hProcess);
Kernel32.CloseHandle(processInfo.hThread);
if (userTokenPtr != null)
{
Kernel32.CloseHandle(userTokenPtr);
}
if (duplicateUserTokenPtr != null)
{
Kernel32.CloseHandle(duplicateUserTokenPtr);
}
if (environmentPtr != null)
{
UserEnv.DestroyEnvironmentBlock(environmentPtr);
}
}
