unhandle exception for normal user click not for admin user

Question

Hi,

I had popup a UI using win32 api creaprocessasuser. It works as I use admin user login. but it give two exception

1. unhandled exception (in event handler)as a normal user try to launch pop UI.

Description: The process was terminated due to an unhandled exception.
Exception Info: System.ObjectDisposedException
at System.Windows.Forms.Control.CreateHandle()
at System.Windows.Forms.Form.CreateHandle()
at System.Windows.Forms.Control.get_Handle()
at System.Windows.Forms.ContainerControl.FocusActiveControlInternal()
at System.Windows.Forms.Form.SetVisibleCore(Boolean)
at System.Windows.Forms.Control.set_Visible(Boolean)
at System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
at System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
at System.Windows.Forms.Application.Run(System.Windows.Forms.Form)
at WinFormPrintDriverApp.Program.Main(System.String[])

Faulting application name: myapplication.exe, version: 1.0.0.0, time stamp: 0xab4b49da
Faulting module name: KERNELBASE.dll, version: 6.3.9600.19671, time stamp: 0x5e67335c
Exception code: 0xe0434352
Fault offset: 0x00013d28
Faulting process id: 0x1d84
Faulting application start time: 0x01d77a36c724e6f6
Faulting application path: c:\testpath\myapplication.exe
Faulting module path: C:\Windows\SYSTEM32\KERNELBASE.dll
Report Id: 0ae714c2-e62a-11eb-8106-0050568ffd89
Faulting package full name:
Faulting package-relative application ID:

what might be issue? Any help appreciated to resolve this isue.

Answer 1

my code:

public static bool StartProcessAsCurrentUser(string appPath, string cmdLine, string currentUserName, string workDir = null, bool visible = true)
{
var hUserToken = IntPtr.Zero;
var startInfo = new STARTUPINFO();
var procInfo = new PROCESS_INFORMATION();
var pEnv = IntPtr.Zero;
int iResultOfCreateProcessAsUser;

        startInfo.cb = Marshal.SizeOf(typeof(STARTUPINFO));


        try
        {

            if (!GetSessionUserToken(ref hUserToken, currentUserName))
              {
                    throw new Exception("StartProcessAsCurrentUser: GetSessionUserToken failed.");
                }

            uint dwCreationFlags = CREATE_UNICODE_ENVIRONMENT | (uint)(visible ? CREATE_NEW_CONSOLE : CREATE_NO_WINDOW);
            startInfo.wShowWindow = (short)(visible ? SW.SW_SHOW : SW.SW_HIDE);
            startInfo.lpDesktop = "winsta0\\default";


            if (!CreateEnvironmentBlock(ref pEnv, hUserToken, false))
            {
                throw new Exception("StartProcessAsCurrentUser: CreateEnvironmentBlock failed.");
            }


            if (!CreateProcessAsUser(hUserToken,
                appPath, // Application Name
                cmdLine, // Command Line
                IntPtr.Zero,
                IntPtr.Zero,
                false,
                dwCreationFlags,
                pEnv,
                workDir, // Working directory
                ref startInfo,
                out procInfo))
            {
                iResultOfCreateProcessAsUser = Marshal.GetLastWin32Error();
                throw new Exception("StartProcessAsCurrentUser: CreateProcessAsUser failed.  Error Code -" + iResultOfCreateProcessAsUser);
            }

            iResultOfCreateProcessAsUser = Marshal.GetLastWin32Error();
        }
        catch(Exception ex)
        { 
            log.Info("StartProcessAsCurrentUser exeption msg:"+ex.Message +" stacktrace:"+ex.StackTrace); 
        }
        finally
        {
            CloseHandle(hUserToken);
            if (pEnv != IntPtr.Zero)
            {
                DestroyEnvironmentBlock(pEnv);
            }
            CloseHandle(procInfo.hThread);
            CloseHandle(procInfo.hProcess);
        }

return true;
}
}

private static bool GetSessionUserToken(ref IntPtr phUserToken, string currentUserName)
{

        var bResult = false;
        var hImpersonationToken = IntPtr.Zero;
        var activeSessionId = INVALID_SESSION_ID;
        try
        {
            ITerminalServicesManager manager = new TerminalServicesManager();

            using (ITerminalServer server = manager.GetLocalServer())
            {
                server.Open();
                foreach (ITerminalServicesSession session in server.GetSessions())
                {
                    if (session.UserName.ToUpper() == currentUserName.ToUpper())
                    {
                        activeSessionId = (uint)session.SessionId;

                        break;
                    }

                }
            }


            // If enumerating did not work, fall back to the old method
            if (activeSessionId == INVALID_SESSION_ID)
            {
                activeSessionId = WTSGetActiveConsoleSessionId();
            }
            log.Info("Method GetSessionUserToken:  activeSessionId:" + activeSessionId);
            if (WTSQueryUserToken(activeSessionId, ref hImpersonationToken) != 0)
            {
                // Convert the impersonation token to a primary token
                bResult = DuplicateTokenEx(hImpersonationToken, 0, IntPtr.Zero,
                    (int)SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation, (int)TOKEN_TYPE.TokenPrimary, ref phUserToken);

                CloseHandle(hImpersonationToken);
            }
            log.Info("GetSessionUserToken ends.");
        }
        catch(Exception ex)
        {
            log.Info("GetSessionUserToken exception:." + ex.Message);
        }
            return bResult;
    }