檢測debugger的方法補遺 (4千字)

還是這個論壇對原始碼格式處理得比較好

下面這幾個都是利用的WinNT的native API來檢查debugger的，所以不能執行在Win9x/ME上。

1、ZwQuerySystemInformation
用這個可以檢查系統偵錯程式是否存在，對SoftICE似乎無用，估計只對微軟自家的WinDBG有效，有條件的可測試一下。

2、ZwSetInformationThread
用這個函式可以將某個執行緒的除錯埠設為0，使得Win32偵錯程式無法再收到該執行緒的除錯事件，使偵錯程式無法再除錯該執行緒。這個主要是針對VC++這樣的ring3偵錯程式的。

3、ZwQueryInformationProcess
這個可以檢查某個程式是否正被ring3偵錯程式所除錯。

測試程式：

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

#define NTAPI __stdcall
typedef long NTSTATUS;
#define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0)
#define STATUS_SUCCESS ((NTSTATUS)0L)

typedef struct _SYSTEM_KERNEL_DEBUGGER_INFORMATION
{
  BOOLEAN DebuggerEnabled;
  BOOLEAN DebuggerNotPresent;
} SYSTEM_KERNEL_DEBUGGER_INFORMATION, *PSYSTEM_KERNEL_DEBUGGER_INFORMATION;

typedef struct _PROCESS_DEBUG_PORT_INFO
{
  HANDLE DebugPort;
}   PROCESS_DEBUG_PORT_INFO;

enum SYSTEM_INFORMATION_CLASS { SystemKernelDebuggerInformation = 35 };
enum THREAD_INFO_CLASS { ThreadHideFromDebugger = 17 };
enum PROCESS_INFO_CLASS { ProcessDebugPort = 7 };

typedef NTSTATUS (NTAPI *ZW_QUERY_SYSTEM_INFORMATION)(IN SYSTEM_INFORMATION_CLASS SystemInformationClass, IN OUT PVOID SystemInformation, IN ULONG SystemInformationLength, OUT PULONG ReturnLength);
typedef NTSTATUS (NTAPI *ZW_SET_INFORMATION_THREAD)(IN HANDLE ThreadHandle, IN THREAD_INFO_CLASS ThreadInformationClass, IN PVOID ThreadInformation, IN ULONG ThreadInformationLength);
typedef NTSTATUS (NTAPI *ZW_QUERY_INFORMATION_PROCESS)(IN HANDLE ProcessHandle, IN PROCESS_INFO_CLASS ProcessInformationClass, OUT PVOID ProcessInformation, IN ULONG ProcessInformationLength, OUT PULONG ReturnLength);

void main( )
{
  HMODULE hModule = GetModuleHandle("ntdll.dll");
  if (hModule == NULL)
  {
      cout << "Failed: GetModuleHandle" << endl;
      cout << "This prog needs WinNT/2K/XP to run." << endl;
      return;
  }

  //------------------------------------------------------------------------------------
  ZW_QUERY_SYSTEM_INFORMATION ZwQuerySystemInformation;
  ZwQuerySystemInformation = (ZW_QUERY_SYSTEM_INFORMATION)GetProcAddress(hModule, "ZwQuerySystemInformation");
  if (ZwQuerySystemInformation == NULL)
  {
      cout << "Failed: GetProcAddress ZwQuerySystemInformation" << endl;
      return;
  }

  SYSTEM_KERNEL_DEBUGGER_INFORMATION Info;
  if (STATUS_SUCCESS == ZwQuerySystemInformation(SystemKernelDebuggerInformation, &Info, sizeof(Info), NULL))
  {
      if (Info.DebuggerEnabled)
      {
          cout << "System debugger enabled" << endl;
          if (Info.DebuggerNotPresent)
              cout << "System debugger not present" << endl;
          else
              cout << "System debugger present" << endl;

      }
      else
          cout << "System debugger disabled" << endl;
  }
  else
  {
      cout << "Failed: ZwQuerySystemInformation" << endl;
  }

  //---------------------------------------------------------------------------------------

  ZW_SET_INFORMATION_THREAD ZwSetInformationThread;
  ZwSetInformationThread = (ZW_SET_INFORMATION_THREAD)GetProcAddress(hModule, "ZwSetInformationThread");
  if (ZwSetInformationThread == NULL)
  {
      cout << "Failed: GetProcAddress ZwSetInformationThread" << endl;
      return;
  }

  if (STATUS_SUCCESS != ZwSetInformationThread(GetCurrentThread( ), ThreadHideFromDebugger, NULL, 0))
      cout << "Failed: ZwSetInformationThread" << endl;

  //---------------------------------------------------------------------------------------
  ZW_QUERY_INFORMATION_PROCESS ZwQueryInformationProcess;
  ZwQueryInformationProcess = (ZW_QUERY_INFORMATION_PROCESS)GetProcAddress(hModule, "ZwQueryInformationProcess");
  if (ZwQueryInformationProcess == NULL)
  {
      cout << "Failed: GetProcAddress ZwQueryInformationprocess" << endl;
      return;
  }

  PROCESS_DEBUG_PORT_INFO ProcessInfo;
  if (STATUS_SUCCESS != ZwQueryInformationProcess(GetCurrentProcess( ), ProcessDebugPort, &ProcessInfo, sizeof(ProcessInfo), NULL))
      cout << "Failed: ZwQueryInformationProcess" << endl;
  else
  {
      if (ProcessInfo.DebugPort)
          cout << "Process debugger present" << endl;
      else
          cout << "Process debugger not present" << endl;
  }

}

檢測debugger的方法補遺 (4千字)

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