unlocking a workstation
- From: sukhjeet786@xxxxxxxxx
- Date: 2 Jan 2007 20:24:00 -0800
Presently i am doing a task of unlocking a workstation
remotely with username and password. from internet search about this
topic
i came across VNC it helped me lot to under stand the concept. But i am
facing one problem.. I
Our restriction is that we cant use a service to unlock. we have to do
it
through DLL injection
So what i am, doing is listed below
1. Create DLL
2. Inject the DLL into Winlogon Address space
3. from Inside the DLL by switching the desktop
PostMessage(HWND_BROADCAST........(seen from VNC)( our computer is
already
locked)
it will display the window asking for user input of
password...........()
Now problem is that i am not able to enter password or user name into
the
field username and password of "unlock computer" window.
I have used sendInput, kebd_event and PostMessage for password
....entering... but none worked......
After pressing Fake ctrl+alt+del it do not accept any input ...plz
help me
Thank u ver much in advance
folowing is the inside code of my dll
BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID
lpReserved)
{
g_hModule = hModule;
HWND hWnd = GetActiveWindow();
switch(ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
FunUnlock();
wchar_t *name = L"Winlogon";
HDESK desktop = OpenDesktop(name, 0, FALSE,
DESKTOP_CREATEMENU | DESKTOP_CREATEWINDOW
|
DESKTOP_ENUMERATE | DESKTOP_HOOKCONTROL |
DESKTOP_WRITEOBJECTS |
DESKTOP_READOBJECTS );
DWORD dwError=0;
if(desktop==0)
dwError= GetLastError();
HDESK old_desktop = GetThreadDesktop(GetCurrentThreadId());
DWORD dummy;
char new_name[256];
if (!GetUserObjectInformation(desktop, UOI_NAME,
&new_name, 256, &dummy)) {
return 1;
}
if(!SetThreadDesktop(desktop)) {
return 2;
}
Switched successfully - destroy the old desktop
//if (!CloseDesktop(old_desktop))
// int n=0;
::PostMessage(HWND_BROADCAST, WM_HOTKEY, 0,
MAKELONG(MOD_ALT | MOD_CONTROL, VK_DELETE));
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, 0x41, 0);
::PostMessage(HWND_BROADCAST, WM_KEYUP, 0x41, 0);*/
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, 0x42, 0);
::PostMessage(HWND_BROADCAST, WM_KEYUP, 0x42, 0);
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, 0x43, 0);
::PostMessage(HWND_BROADCAST, WM_KEYUP, 0x43, 0);
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, 0x44, 0);
::PostMessage(HWND_BROADCAST, WM_KEYUP, 0x44, 0);
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, 0x45, 0);
::PostMessage(HWND_BROADCAST, WM_KEYUP, 0x45, 0);
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, 0x46, 0);
::PostMessage(HWND_BROADCAST, WM_KEYUP, 0x46, 0);
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, 0x47, 0);
::PostMessage(HWND_BROADCAST, WM_KEYUP, 0x47, 0);*/
::PostMessage(HWND_BROADCAST, WM_KEYDOWN, VK_RETURN, 0);
::PostMessage(HWND_BROADCAST ,WM_KEYUP, VK_RETURN, 0);
}
break;
default:
break;
}
return TRUE;
}
.
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