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shield分析

本文仅供学习交流,只提供关键思路不会给出完整代码,严禁用于非法用途,若有侵权请联系我删除!技术交流合作请私信!

熟练打开Fiddler设置好手机代理,摆弄半天一直抓不到包,应该是小红书监测到了Fiddler,后面使用 Hook okhttp成功搞到了包,参考大佬的工具:https://github.com/siyujie/okhttp_find ,如果被删除请联系我。

分析后发现关键字搜索,帖子详情,用户信息等接口Header中都带上了 shield 字段,反编译小红书apk(我使用的是Jadx),经过不断搜索, Hook动态调试定位到关键方法:initializeNative,initialize,intercept  

 可以看到这几个关键方法都使用native修饰,核心的代码都被隐藏到了 libshield.so文件中。

这里推荐一位大佬的工具Unidbg:GitHub - zhkl0228/unidbg: Allows you to emulate an Android native library, and an experimental iOS emulation

按照教程搭建好环境后,调用JNI_onload方法:

        vm.setVerbose(true); //打印虚拟器日志vm.setJni(this);module = dm.getModule();// 打印 onload方法,会打印出动态注入的方法位置dm.callJNI_OnLoad(emulator);

如下:initializeNative方法的位置为:0x94289, intercept为0x939d9, initialize为0x937b1

RegisterNative(com/xingin/shield/http/XhsHttpInterceptor, initializeNative()V, RX@0x40094289[libshield.so]0x94289)
RegisterNative(com/xingin/shield/http/XhsHttpInterceptor, intercept(Lokhttp3/Interceptor$Chain;J)Lokhttp3/Response;, RX@0x400939d9[libshield.so]0x939d9)
RegisterNative(com/xingin/shield/http/XhsHttpInterceptor, initialize(Ljava/lang/String;)J, RX@0x400937b1[libshield.so]0x937b1)
RegisterNative(com/xingin/shield/http/XhsHttpInterceptor, destroy(J)V, RX@0x40093745[libshield.so]0x93745)

拿到位置后,可以通过unidbg模拟去调用这三个方法得到最终结果:报错一般是缺少环境,根据提示缺啥补啥,调用代码例:

  //初始化nativepublic void initializeNative(){List<Object> params = new ArrayList<>();params.add(vm.getJNIEnv()); //第一个参数默认envparams.add(0); //第二个参数一般为0module.callFunction(emulator,0x94289,params.toArray());}

        XhsShieldSimpleTest xhsShieldTest = new XhsShieldSimpleTest(url,commonParams);xhsShieldTest.initializeNative();long initialize = xhsShieldTest.initialize();xhsShieldTest.intercept(initialize);System.out.println("shieId:"+shiled);

其他:

deviceId : 设备ID, 可通过接口生成

device_fingerprint : 设备信息

hmac : 存储在设备的/data/data/com.xingin.xhs/shared_prefs/s.xml中

sid:登录账号参数

build : 版本

关键字搜索示例:

shieId:XYAAAAAQAAAAEAAABTAAAAUzUWEe0xG1IbD9/c+qCLOlKGmTtFa+lG43AGdeFXQ6RAzYbkyOJgS534qeBbz8N/iJl+2KE3EwxPGGOBbe6g3SNp0LDZQUi2jBrG0rQy6uY02NTR
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