quote:

---

A 3rd party freeware version of SU is available here

---

code:

---

  
*/

#include <windows.h>			    
#include <iostream.h>
#include <winerror.h>

#define NAME_BUF_SZ 255

void ErrorHandler (LPSTR errmsg)
{
	cerr << "Error: " << errmsg << ". Error Code: " << GetLastError() << endl;
}

BOOL SetUserObjectAllAccess(HANDLE hObject)
{
	PSECURITY_DESCRIPTOR pSD;
	SECURITY_INFORMATION si;
	BOOL success;

	/* Initialize a security descriptor. */

	pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);   /* defined in WINNT.H */
	if (pSD == NULL) 
	{
    	ErrorHandler("Can't Allocate Local Memory");
    	return FALSE;
    }

	if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION)) 
	{ /* defined in WINNT.H */
    	ErrorHandler("Can't Initialize Security Descriptor");
		LocalFree ((HLOCAL) pSD);
		return FALSE;
	}

	/* Add a NULL disc. ACL to the security descriptor. */
	if (!SetSecurityDescriptorDacl(pSD,
        TRUE,     /* specifying a disc. ACL  */
        (PACL) NULL,
        FALSE))  /* not a default disc. ACL */
    {
    	ErrorHandler("Can't Set Security Descriptor DACL");
		LocalFree ((HLOCAL) pSD);
		return FALSE;
	}

	/* Add the security descriptor to the file. */
	si = DACL_SECURITY_INFORMATION; 
	success = SetUserObjectSecurity(hObject,
    	    &si,
        	pSD);

    LocalFree((HLOCAL) pSD);

	if ( ! success )
	{
    	ErrorHandler("Can't Set User Object Security");
		return FALSE;
	}
	else
	{
		return TRUE;
	}
}

void main(int argc, char *argv[])
{
	CHAR 	pwstr[NAME_BUF_SZ],
			user[NAME_BUF_SZ],
			commandLine[NAME_BUF_SZ];
	STARTUPINFO startUpInfo;
	PROCESS_INFORMATION procInfo;
	HDESK hDesktop;
	HWINSTA hWindowStation;
	HANDLE hRootsid, hConsole;
	DWORD err, oldConsoleMode, newConsoleMode;
	OSVERSIONINFO NTversion;

	// Make sure we are using the minimum OS version.
	NTversion.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
	if (! GetVersionEx(&NTversion) )
	{
		ErrorHandler ("Unable to get OS version");
		exit(1);
	}

	if (NTversion.dwPlatformId != VER_PLATFORM_WIN32_NT)
	{
		cerr << "su will run only on Windows NT." << endl;
		exit(1);
	}

	if (NTversion.dwBuildNumber < 1057) // Commercial 3.51 release
	{
		cerr << "su requires at minimum NT version 3.51 build 1057." << endl;
		exit(1);
	}

#ifdef VERBOSE
	cout << "su: NT Version " << NTversion.dwMajorVersion << "." <<
		NTversion.dwMinorVersion << ", build " << NTversion.dwBuildNumber <<
		endl; 
#endif

	// Retrieve command line parameters
	switch (argc)
	{
	case 0:	 case 1:
		strcpy(user, "Administrator");
		strcpy(commandLine, "cmd");
		break;
	case 2:
		strcpy(user, *++argv);
		strcpy(commandLine, "cmd");
		break;
	default:
		strcpy(user, *++argv);
		strcpy(commandLine, "");
		while (*++argv)
		{
			strcat(commandLine, *argv);
			strcat(commandLine, " ");
		}
		break;
	}

#ifdef VERBOSE
	cout << "argc: "  << argc << endl 
		 << "user: (" << user << ")" << endl
		 << "cmd : (" << commandLine << ")" << endl;
#endif

	// Turn off console mode echo, since we don't want clear-screen passwords
	if ((hConsole = GetStdHandle(STD_INPUT_HANDLE)) == 	INVALID_HANDLE_VALUE)
	{
		ErrorHandler ("Can't get handle of STDIN");
		exit(1);
	}

	if (! GetConsoleMode(hConsole, &oldConsoleMode))
	{
		ErrorHandler ("Can't get current Console Mode");
		exit(1);
	}

	newConsoleMode = oldConsoleMode & ( ~ ENABLE_ECHO_INPUT );

	if (! SetConsoleMode(hConsole, newConsoleMode))
	{
		ErrorHandler ("Unable to turn off Echo");
		exit(1);
	}

	// Ask for the password
	cout << "Enter password: ";
	cin.getline(pwstr,NAME_BUF_SZ);
	// When echo is off and user hits <RETURN>, CR-LF is not echoed, so do it for him
	cout << endl;
	if (! SetConsoleMode(hConsole, oldConsoleMode))
	{
		ErrorHandler ("Unable to reset previous console mode");
		exit(1);
	}
 	CloseHandle (hConsole);
 	 
	// Logon the administrator
	if (!LogonUser (user,NULL,pwstr, LOGON32_LOGON_INTERACTIVE,
					LOGON32_PROVIDER_DEFAULT, &hRootsid) )
	{
		err = GetLastError();
		switch (err) {
		case ERROR_PRIVILEGE_NOT_HELD:
			cerr << "Error: you do not have the SeTcbPrivilege (act as part of OS)  privilege." << endl;
			break;
		case ERROR_LOGON_FAILURE:
			cerr << "Wrong password." << endl;
			break;
		case ERROR_ACCESS_DENIED:
			ErrorHandler("Access is denied");
			break;
		default:
			ErrorHandler("Unable to logon");
			break;
		}
		exit(1);
	}

	// Retrieve the STARTUPINFO structure for the current process
	GetStartupInfo(&startUpInfo);

	// give the user access to the WindowStation and Desktop
	hWindowStation = GetProcessWindowStation();
	if (!SetUserObjectAllAccess(hWindowStation))
	{
		cerr << "Cannot set WindowStation security" ; 
		CloseHandle (hRootsid);
		exit(1);
	}
	hDesktop = GetThreadDesktop(GetCurrentThreadId());
	if (!SetUserObjectAllAccess(hDesktop))
	{
		cerr << "Cannot set Desktop security"; 
	 	CloseHandle (hRootsid);
		exit(1);
	}

	// Create the child process
	if ( ! CreateProcessAsUser(hRootsid,
		0, commandLine, 0, 0, FALSE,
		CREATE_NEW_CONSOLE | CREATE_NEW_PROCESS_GROUP ,
		0, 0, &startUpInfo, &procInfo) )
	{
		err = GetLastError();
		switch (err) {
		case ERROR_PRIVILEGE_NOT_HELD:
			cerr << "Error: you do not have the SeAssignPrimary or SeIncreaseQuota Privileges." << endl;
			break;
		default:
			ErrorHandler ("Can't create process");
			break;
		} 
	}

	// Wait for the child to complete
	WaitForSingleObject(procInfo.hProcess, INFINITE);
	CloseHandle(hWindowStation);
	CloseHandle(hDesktop);
	CloseHandle(hRootsid);
	exit(0);
}

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