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DisableCtrlAltDel.cpp
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DisableCtrlAltDel.cpp
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#include <Windows.h>
#include <TlHelp32.h>
#include <string>
#define SE_DEBUG_PRIVILEGE 20
typedef LONG(__stdcall *RtlAdjustPrivilege)(ULONG Privilege, BOOLEAN Enable, BOOLEAN CurrentThread, PBOOLEAN Enabled);
typedef LONG(__stdcall *SuspendOrResumeProcess)(HANDLE hProcess);
DWORD GetWinlogonPid() {
HANDLE snap;
PROCESSENTRY32 pEntry;
BOOL rtn;
snap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
pEntry.dwSize = sizeof(pEntry);
rtn = Process32First(snap, &pEntry);
while (rtn) {
if (!strcmp(pEntry.szExeFile, "winlogon.exe")) {
CloseHandle(snap);
return pEntry.th32ProcessID;
}
memset(pEntry.szExeFile, 0, 260);
rtn = Process32Next(snap, &pEntry);
}
CloseHandle(snap);
return 0;
}
int main() {
HMODULE hMod = LoadLibrary("ntdll");
if (hMod == 0) {
MessageBox(NULL, "Failed to load ntdll!", "Error", MB_OK | MB_ICONEXCLAMATION);
return 1;
}
RtlAdjustPrivilege lpfnRtlAdjustPrivilege = (RtlAdjustPrivilege)GetProcAddress(hMod, "RtlAdjustPrivilege");
if (lpfnRtlAdjustPrivilege == 0) {
MessageBox(NULL, "Failed to get address of RtlAdjustPrivilege!", "Error", MB_OK | MB_ICONEXCLAMATION);
return 1;
}
SuspendOrResumeProcess lpfnNtSuspendProcess = (SuspendOrResumeProcess)GetProcAddress(hMod, "NtSuspendProcess");
if (lpfnNtSuspendProcess == 0) {
MessageBox(NULL, "Failed to get address of NtSuspendProcess!", "Error", MB_OK | MB_ICONEXCLAMATION);
return 1;
}
SuspendOrResumeProcess lpfnNtResumeProcess = (SuspendOrResumeProcess)GetProcAddress(hMod, "NtResumeProcess");
if (lpfnNtResumeProcess == 0) {
MessageBox(NULL, "Failed to get address of NtResumeProcess!", "Error", MB_OK | MB_ICONEXCLAMATION);
return 1;
}
DWORD pid = GetWinlogonPid();
if (pid == 0) {
MessageBox(NULL, "Cannot find winlogon.exe!", "Error", MB_OK | MB_ICONEXCLAMATION);
return 1;
}
BOOLEAN dummy = 0;
lpfnRtlAdjustPrivilege(SE_DEBUG_PRIVILEGE, true, false, &dummy);
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, pid);
if (hProcess == 0) {
MessageBox(NULL, "Failed to open winlogon.exe! Do you have administrative privilege?", "Error", MB_OK | MB_ICONEXCLAMATION);
return 1;
}
lpfnNtSuspendProcess(hProcess);
MessageBox(NULL, "Now Ctrl+Alt+Del is disabled! Press OK to restore.", "Ha!", MB_OK | MB_ICONINFORMATION);
lpfnNtResumeProcess(hProcess);
CloseHandle(hProcess);
return 0;
}