论坛网站在线生成互联网营销师有什么用
一:背景
1. 讲故事
在前面的系列中,我们聊过.NET外挂 harmony,他可以对.NET SDK
方法进行拦截,这在.NET高级调试
领域中非常重要,但这里也有一些遗憾,就是不能对SDK领域之外的函数进行拦截,比如 Win32 函数。。。
这篇我们就来解决这个问题,对,它就是 MinHook,当然我也调查了easyhook
和detours
,前者年久失修,后者是商业库,加上我的要求相对简单,使用极简版的 minhook 就够了,而且该项目在github上也是非常活跃的:https://github.com/TsudaKageyu/minhook
- 开箱即用,下载
MinHook_134_bin.zip
即可。 - 多项目融合,下载
MinHook_134_lib.zip
即可。
二:MinHook 案例演示
1. 开箱即用方式
观察 MinHook.h
头文件,会发现很多的 C 导出函数,如下所示:
#ifdef __cplusplus
extern "C" {
#endif// Initialize the MinHook library. You must call this function EXACTLY ONCE// at the beginning of your program.MH_STATUS WINAPI MH_Initialize(VOID);// Uninitialize the MinHook library. You must call this function EXACTLY// ONCE at the end of your program.MH_STATUS WINAPI MH_Uninitialize(VOID);...
}
有了这些导出函数,就可以通过 C# 的 PInvoke 直接调用,这里就演示一个拦截 MessageBox 方法,完整代码如下:
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;namespace ConsoleApp2
{internal class Program{static void Main(string[] args){// 安装钩子HookManager.InstallHook("user32.dll", "MessageBoxW",(IntPtr hWnd, string text, string caption, uint type) =>{Console.WriteLine($"我已成功拦截到 MessageBox:内容 {text}, 标题: {caption}");var original = Marshal.GetDelegateForFunctionPointer<HookManager.MessageBoxDelegate>(HookManager.OriginalFunction);return original(hWnd, text, caption, type);});// 测试 MessageBox 调用(钩子会捕获这个)MessageBox(IntPtr.Zero, "This is a test", "Test", 0);// 卸载钩子HookManager.UninstallHook();Console.ReadLine();}[DllImport("user32.dll", CharSet = CharSet.Unicode)]private static extern int MessageBox(IntPtr hWnd, string text, string caption, uint type);}public static class HookManager{// 定义 MessageBox 的委托[UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode)]public delegate int MessageBoxDelegate(IntPtr hWnd, string text, string caption, uint type);// 原始函数的指针public static IntPtr OriginalFunction = IntPtr.Zero;// 当前钩子的目标函数地址private static IntPtr _targetFunction = IntPtr.Zero;public static void InstallHook(string moduleName, string functionName, MessageBoxDelegate detourFunc){// 1. 初始化 MinHookvar status = MinHook.MH_Initialize();if (status != MinHook.MH_STATUS.MH_OK){Console.WriteLine($"MH_Initialize failed: {status}");return;}// 2. 获取目标函数的地址_targetFunction = MinHook.GetProcAddress(MinHook.GetModuleHandle(moduleName), functionName);if (_targetFunction == IntPtr.Zero){Console.WriteLine($"Failed to get {functionName} address");return;}// 3. 创建钩子var detourPtr = Marshal.GetFunctionPointerForDelegate(detourFunc);status = MinHook.MH_CreateHook(_targetFunction, detourPtr, out OriginalFunction);if (status != MinHook.MH_STATUS.MH_OK){Console.WriteLine($"MH_CreateHook failed: {status}");return;}// 4. 启用钩子status = MinHook.MH_EnableHook(_targetFunction);if (status != MinHook.MH_STATUS.MH_OK){Console.WriteLine($"MH_EnableHook failed: {status}");return;}Console.WriteLine($"{functionName} hook installed successfully");}public static void UninstallHook(){if (_targetFunction == IntPtr.Zero){Console.WriteLine("No active hook to uninstall");return;}// 1. 禁用钩子var status = MinHook.MH_DisableHook(_targetFunction);if (status != MinHook.MH_STATUS.MH_OK){Console.WriteLine($"MH_DisableHook failed: {status}");}// 2. 移除钩子status = MinHook.MH_RemoveHook(_targetFunction);if (status != MinHook.MH_STATUS.MH_OK){Console.WriteLine($"MH_RemoveHook failed: {status}");}// 3. 卸载 MinHookstatus = MinHook.MH_Uninitialize();if (status != MinHook.MH_STATUS.MH_OK){Console.WriteLine($"MH_Uninitialize failed: {status}");}_targetFunction = IntPtr.Zero;OriginalFunction = IntPtr.Zero;Console.WriteLine("Hook uninstalled successfully");}}public class MinHook{// MH_STATUS 枚举public enum MH_STATUS{MH_UNKNOWN = -1,MH_OK = 0,MH_ERROR_ALREADY_INITIALIZED,MH_ERROR_NOT_INITIALIZED,MH_ERROR_ALREADY_CREATED,MH_ERROR_NOT_CREATED,MH_ERROR_ENABLED,MH_ERROR_DISABLED,MH_ERROR_NOT_EXECUTABLE,MH_ERROR_UNSUPPORTED_FUNCTION,MH_ERROR_MEMORY_ALLOC,MH_ERROR_MEMORY_PROTECT,MH_ERROR_MODULE_NOT_FOUND,MH_ERROR_FUNCTION_NOT_FOUND}public IntPtr MH_ALL_HOOKS = IntPtr.Zero;// 导入 MinHook 函数[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl)]public static extern MH_STATUS MH_Initialize();[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl)]public static extern MH_STATUS MH_Uninitialize();[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl)]public static extern MH_STATUS MH_CreateHook(IntPtr pTarget, IntPtr pDetour, out IntPtr ppOriginal);[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode)]public static extern MH_STATUS MH_CreateHookApi(string pszModule, string pszProcName, IntPtr pDetour, out IntPtr ppOriginal);[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl)]public static extern MH_STATUS MH_RemoveHook(IntPtr pTarget);[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl)]public static extern MH_STATUS MH_EnableHook(IntPtr pTarget);[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl)]public static extern MH_STATUS MH_DisableHook(IntPtr pTarget);[DllImport("MinHook.x86.dll", CallingConvention = CallingConvention.Cdecl)]public static extern IntPtr MH_StatusToString(MH_STATUS status);[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]public static extern IntPtr GetModuleHandle(string lpModuleName);[DllImport("kernel32.dll", CharSet = CharSet.Ansi, SetLastError = true)]public static extern IntPtr GetProcAddress(IntPtr hModule, string lpProcName);}
}
由于这个 C# 程序是 32bit 的,所以将 MinHook.x86.dll
拷贝到C#程序的当前目录。
最后将程序运行起来,该有的都出现了。
个人实践下来,我发现有两个小问题:
- 当你用 vs 单步调试的时候,走到
MH_CreateHook
方法时会抛Fatal error. Internal CLR error. (0x80131506)
CLR 内部错误,看起来VS调试器做了一些手脚,截图如下:
- 当你想在 InstallHook 中的 detourFunc 函数下断点,也不会被命中,截图如下:
总的来说对VS调试有一点影响,但也不太大,还是可以接受的,毕竟用 C# 来调用轻车熟路,如果你熟悉 windbg 的话,用它是一点问题都没有。。。
2. 深度融合方式
用 C# 的 Pinvoke 调用 MinHook,总感觉少了那个味,如果用原汁原味的 C 调用 MinHook 那就相当完美了,在解决一些比较复杂注入非常有必要。
这里我采用 libMinHook.x86.lib
以静态链接的方式将当前的 ConsoleApplication2 和 MinHook 合二为一,截图如下:
接下来做三点配置:
- 右键属性 配置下 头文件 和 dll库 搜索路径,截图如下:
- 右键属性 配置下 依赖文件名,截图如下:
最后就是完整的 C 代码。
#include <windows.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>
#include <MinHook.h>typedef int (WINAPI* Real_MessageBoxW)(HWND hWnd,LPCWSTR lpText,LPCWSTR lpCaption,UINT uType);Real_MessageBoxW fpMessageBoxW = NULL;int WINAPI Hook_MessageBoxW(HWND hWnd,LPCWSTR lpText,LPCWSTR lpCaption,UINT uType)
{_setmode(_fileno(stdout), _O_U16TEXT);wprintf(L"拦截 MessageBoxW:\n");wprintf(L" 文本: %s\n", lpText); // 移除 &,直接使用 lpTextwprintf(L" 标题: %s\n", lpCaption); // 移除 &,直接使用 lpCaptionreturn fpMessageBoxW(hWnd,lpText,lpCaption,uType);
}extern "C" __declspec(dllexport) void InstallHook()
{HMODULE hModule = GetModuleHandleW(L"user32.dll");Real_MessageBoxW pOrigMessageBoxW = (Real_MessageBoxW)GetProcAddress(hModule, "MessageBoxW");if (pOrigMessageBoxW == NULL) {printf("无法获取 MessageBoxW 地址\n");return;}if (MH_Initialize() != MH_OK) {printf("MinHook 初始化失败\n");return;}if (MH_CreateHook(pOrigMessageBoxW, &Hook_MessageBoxW, (void**)&fpMessageBoxW) != MH_OK) {printf("创建 Hook 失败\n");return;}if (MH_EnableHook(pOrigMessageBoxW) != MH_OK) {printf("启用 Hook 失败\n");return;}printf("MessageBoxW Hook 安装成功\n");
}extern "C" __declspec(dllexport) void UninstallHook()
{MH_DisableHook(MH_ALL_HOOKS);MH_Uninitialize();
}
这是只对外公开了 InstallHook 和 UninstallHook 装卸载方法,最后就是高层的 C# 代码。
using System;
using System.Runtime.InteropServices;namespace ConsoleApp1
{internal class Program{static void Main(string[] args){Console.WriteLine("正在安装 MessageBox 钩子...");InstallHook();Console.WriteLine("将弹出测试消息框,观察输出...");// 弹出测试消息框(会被钩子拦截)MessageBoxW(IntPtr.Zero, "这是测试内容", "测试标题", 0);Console.WriteLine("按任意键退出并卸载钩子...");Console.ReadKey();UninstallHook();Console.WriteLine("钩子已卸载");}// 导入 user32.dll 的 MessageBoxW[DllImport("user32.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]public static extern int MessageBoxW(IntPtr hWnd,string lpText,string lpCaption,uint uType);// 导入DLL中的函数[DllImport("ConsoleApplication2.dll", CallingConvention = CallingConvention.Cdecl)]public static extern void InstallHook();[DllImport("ConsoleApplication2.dll", CallingConvention = CallingConvention.Cdecl)]public static extern void UninstallHook();}
}
在运行之前将 ConsoleApplication2
拷贝到 C# 程序的当前目录,直接运行 C# 项目即可。
三:总结
开箱和融合两种方式都有自己的用途,下一篇我们上一个很真实的场景,让大家体会下 win32 的注入对高级调试领域
的强大功效。