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#define RTN_OK 0
#define RTN_USAGE 1
#define RTN_ERROR 13

#include <windows.h>
#include <stdio.h>

BOOL SetPrivilege(
  HANDLE hToken,          // token handle
  LPCTSTR Privilege,      // Privilege to enable/disable
  BOOL bEnablePrivilege   // TRUE to enable.  FALSE to disable
  );

void DisplayError(LPTSTR szAPI);
VOID PrintHex(PBYTE Data, ULONG dwBytes);

int main(int argc, char *argv[])
{
  HANDLE hProcess;
  HANDLE hToken;
  int dwRetVal = RTN_OK; // assume success from main()

  // show correct usage for kill
  if (argc != 2)
  {
    fprintf(stderr, "Usage: %s [ProcessId]\n", argv[0]);
    return RTN_USAGE;
  }

  if (!OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, FALSE, &hToken))
  {
    if (GetLastError() == ERROR_NO_TOKEN)
    {
      if (!ImpersonateSelf(SecurityImpersonation))
        return RTN_ERROR;

      if (!OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, FALSE, &hToken)){
        DisplayError(L"OpenThreadToken");
        return RTN_ERROR;
      }
    }
    else
      return RTN_ERROR;
  }

  // enable SeDebugPrivilege
  if (!SetPrivilege(hToken, SE_DEBUG_NAME, TRUE))
  {
    DisplayError(L"SetPrivilege");

    // close token handle
    CloseHandle(hToken);

    // indicate failure
    return RTN_ERROR;
  }
  
  CloseHandle(hToken);

  // open the process
  if ((hProcess = OpenProcess(
    PROCESS_QUERY_INFORMATION,
    FALSE,
    atoi(argv[1]) // PID from commandline
    )) == NULL)
  {
    DisplayError(L"OpenProcess");
    return RTN_ERROR;
  }

  // Open process token.
  if (!OpenProcessToken(hProcess, TOKEN_READ, &hToken)) {
    DisplayError(L"OpenProcessToken");
    return RTN_ERROR;
  }

  DWORD ReturnLength = 0;
  if (!GetTokenInformation(hToken, TokenDefaultDacl, NULL, 0, &ReturnLength) && GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
    DisplayError(L"GetTokenInformation #1");
    return RTN_ERROR;
  }

  PBYTE OutputBuffer = (PBYTE)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, ReturnLength);
  if (!GetTokenInformation(hToken, TokenDefaultDacl, OutputBuffer, ReturnLength, &ReturnLength)) {
    DisplayError(L"GetTokenInformation #2");
    return RTN_ERROR;
  }

  PrintHex(OutputBuffer, ReturnLength);

  // close handles
  HeapFree(GetProcessHeap(), 0, OutputBuffer);
  CloseHandle(hProcess);

  return dwRetVal;
}

BOOL SetPrivilege(
  HANDLE hToken,          // token handle
  LPCTSTR Privilege,      // Privilege to enable/disable
  BOOL bEnablePrivilege   // TRUE to enable.  FALSE to disable
  )
{
  TOKEN_PRIVILEGES tp;
  LUID luid;
  TOKEN_PRIVILEGES tpPrevious;
  DWORD cbPrevious = sizeof(TOKEN_PRIVILEGES);

  if (!LookupPrivilegeValue(NULL, Privilege, &luid)) return FALSE;

  // 
  // first pass.  get current privilege setting
  // 
  tp.PrivilegeCount = 1;
  tp.Privileges[0].Luid = luid;
  tp.Privileges[0].Attributes = 0;

  AdjustTokenPrivileges(
    hToken,
    FALSE,
    &tp,
    sizeof(TOKEN_PRIVILEGES),
    &tpPrevious,
    &cbPrevious
    );

  if (GetLastError() != ERROR_SUCCESS) return FALSE;

  // 
  // second pass.  set privilege based on previous setting
  // 
  tpPrevious.PrivilegeCount = 1;
  tpPrevious.Privileges[0].Luid = luid;

  if (bEnablePrivilege) {
    tpPrevious.Privileges[0].Attributes |= (SE_PRIVILEGE_ENABLED);
  }
  else {
    tpPrevious.Privileges[0].Attributes ^= (SE_PRIVILEGE_ENABLED &
      tpPrevious.Privileges[0].Attributes);
  }

  AdjustTokenPrivileges(
    hToken,
    FALSE,
    &tpPrevious,
    cbPrevious,
    NULL,
    NULL
    );

  if (GetLastError() != ERROR_SUCCESS) return FALSE;

  return TRUE;
}

void DisplayError(
  LPTSTR szAPI    // pointer to failed API name
  )
{
  LPTSTR MessageBuffer;
  DWORD dwBufferLength;

  fwprintf(stderr, L"%s() error!\n", szAPI);

  if (dwBufferLength = FormatMessage(
    FORMAT_MESSAGE_ALLOCATE_BUFFER |
    FORMAT_MESSAGE_FROM_SYSTEM,
    NULL,
    GetLastError(),
    GetSystemDefaultLangID(),
    (LPTSTR)&MessageBuffer,
    0,
    NULL
    ))
  {
    DWORD dwBytesWritten;

    // 
    // Output message string on stderr
    // 
    WriteFile(
      GetStdHandle(STD_ERROR_HANDLE),
      MessageBuffer,
      dwBufferLength,
      &dwBytesWritten,
      NULL
      );

    // 
    // free the buffer allocated by the system
    // 
    LocalFree(MessageBuffer);
  }
}

VOID PrintHex(PBYTE Data, ULONG dwBytes) {
  for (ULONG i = 0; i < dwBytes; i += 16) {
    printf("%.8x: ", i);

    for (ULONG j = 0; j < 16; j++) {
      if (i + j < dwBytes) {
        printf("%.2x ", Data[i + j]);
      }
      else {
        printf("?? ");
      }
    }

    for (ULONG j = 0; j < 16; j++) {
      if (i + j < dwBytes && Data[i + j] >= 0x20 && Data[i + j] <= 0x7e) {
        printf("%c", Data[i + j]);
      }
      else {
        printf(".");
      }
    }

    printf("\n");
  }
}