1. Xposed框架核心原理
1.1 运行时架构解析
Android ART Hook机制:
graph TD A[目标APP进程] --> B{系统Zygote} B -->|加载Xposed| C[XposedBridge] C --> D[模块1] C --> E[模块2] D --> F[Hook目标方法] E --> F
1.1.1 核心组件交互流程
-
XposedBridge:注入Zygote进程,管理模块生命周期
-
Xposed模块:声明
assets/xposed_init
入口,实现IXposedHookLoadPackage
接口 -
Hook逻辑:通过
XposedHelpers
动态修改目标类方法
1.2 与Frida/Root方案对比
维度 | Xposed | Frida | Root方案 |
---|---|---|---|
侵入性 | 需修改系统 | 无 | 需解锁Bootloader |
稳定性 | 高 | 依赖设备兼容性 | 高 |
实时生效 | 需重启APP | 即时生效 | 即时生效 |
开发复杂度 | Java/Kotlin为主 | 多语言支持 | 需Native开发 |
2. 开发环境配置
2.1 框架部署方案
Magisk + LSPosed安装流程:
# 通过Magisk安装LSPosed
adb install Magisk-v26.4.apk
adb push LSPosed-v1.9.2.zip /sdcard/
# Magisk内刷入模块后重启
设备兼容性验证:
if (XposedBridge.isXposedEnabled()) { Log.d("XposedCheck", "框架已激活");
} else { throw new RuntimeException("Xposed未启用");
}
2.2 模块开发脚手架
build.gradle关键配置:
dependencies { compileOnly 'de.robv.android.xposed:api:82' compileOnly 'de.robv.android.xposed:api:82:sources'
} android { defaultConfig { // 声明Xposed模块标识 resValue "string", "xposed_module_id", "com.example.hookdemo" resValue "bool", "xposed_description", "示例模块" }
}
xposed_init入口文件:
com.example.hookdemo.HookEntry
3. Hook技术深度实践
3.1 方法级拦截
基础Hook模板:
public class HookEntry implements IXposedHookLoadPackage { @Override public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) { if (!lpparam.packageName.equals("com.target.app")) return; XposedHelpers.findAndHookMethod( "com.target.app.MainActivity", lpparam.classLoader, "onCreate", Bundle.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { Log.d("Xposed", "MainActivity正在启动"); } @Override protected void afterHookedMethod(MethodHookParam param) { TextView tv = ((Activity) param.thisObject).findViewById(R.id.text); tv.setText("已被修改"); } } ); }
}
3.2 构造函数Hook
修改单例实例:
XposedHelpers.findAndHookConstructor( "com.target.app.Singleton", lpparam.classLoader, new XC_MethodHook() { @Override protected void afterHookedMethod(MethodHookParam param) { // 替换单例实例 Field instanceField = param.thisObject.getClass().getDeclaredField("INSTANCE"); instanceField.setAccessible(true); instanceField.set(null, new CustomSingleton()); } }
);
4. 资源篡改技术
4.1 布局动态修改
替换View内容:
XposedHelpers.findAndHookMethod( "android.app.Activity", lpparam.classLoader, "setContentView", int.class, new XC_MethodHook() { @Override protected void afterHookedMethod(MethodHookParam param) { Activity activity = (Activity) param.thisObject; View rootView = activity.getWindow().getDecorView(); TextView target = rootView.findViewById(activity.getResources().getIdentifier("title", "id", activity.getPackageName())); target.setText("Hacked Title"); } }
);
4.2 资源重定向
修改字符串资源:
<!-- 模块资源文件res/values/strings.xml -->
<string name="original_text">New Content</string>
Hook资源加载:
XposedHelpers.findAndHookMethod( "android.content.res.Resources", lpparam.classLoader, "getString", int.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { int id = (int) param.args[0]; if (id == R.string.original_text) { param.setResult("已被修改"); } } }
);
5. 反检测对抗技术
5.1 隐藏Xposed特征
绕过Xposed检测:
XposedHelpers.findAndHookMethod( "android.os.SystemProperties", lpparam.classLoader, "get", String.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { if ("ro.xposed".equals(param.args[0])) { param.setResult(""); // 清空特征值 } } }
);
5.2 动态代码加载
解密关键逻辑:
// 动态加载解密后的类
byte[] decrypted = decrypt(hiddenData);
Class<?> realClass = (Class<?>) XposedHelpers.callMethod( ClassLoader.getSystemClassLoader(), "defineClass", decrypted, 0, decrypted.length
);
6. 企业级实战案例
6.1 协议签名绕过
Hook签名算法:
XposedHelpers.findAndHookMethod( "com.target.app.SignUtils", lpparam.classLoader, "generateSign", String.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { param.args[0] = "fixed_signature"; // 固定签名值 } }
);
6.2 权限提升攻击
动态添加权限:
XposedHelpers.findAndHookMethod( "android.app.ContextImpl", lpparam.classLoader, "checkPermission", String.class, int.class, int.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { if (Manifest.permission.READ_SMS.equals(param.args[0])) { param.setResult(PackageManager.PERMISSION_GRANTED); } } }
);
7. 模块调试与优化
7.1 日志实时监控
跨进程日志收集:
XposedBridge.log("Hook事件: " + param.method.getName()); // 通过Socket转发到PC
Socket client = new Socket("192.168.1.100", 9000);
PrintWriter out = new PrintWriter(client.getOutputStream());
out.println("HOOK_LOG: " + logMsg);
7.2 性能优化策略
Hook过滤器:
public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) { Set<String> targetClasses = new HashSet<>(Arrays.asList( "com.target.app.MainActivity", "com.target.app.network.ApiService" )); XposedHelpers.findAndHookMethod( lpparam.classLoader, targetClasses, "onCreate", Bundle.class, new XC_MethodHook() { /* ... */ } );
}
技术验证清单:
-
实现基础方法Hook并修改返回值
-
完成资源文件动态替换
-
绕过常见Xposed检测方案
-
构建权限提升攻击模块
-
实现企业级协议破解案例
本章实验需在已激活Xposed环境的测试设备进行,推荐使用Android 9-11的官方模拟器。所有案例仅用于技术研究,禁止用于未授权场景。
关于作者:
15年互联网开发、带过10-20人的团队,多次帮助公司从0到1完成项目开发,在TX等大厂都工作过。当下为退役状态,写此篇文章属个人爱好。本人开发期间收集了很多开发课程等资料,需要可联系我