字节系app通用抓包脚本
已测试某音(28.4.0), 某茄小说(6.0.5.32)
原理
获取SSL_CTX_set_custom_verify的参数3(回调函数)
1 2 3 4 | void SSL_CTX_set_custom_verify(SSL_CTX *ctx, int mode, enum ssl_verify_result_t (*callback)(SSL *ssl, uint8_t *out_alert)) { ctx->verify_mode = mode; ctx->custom_verify_callback = callback;} |
让回调函数的返回值保持为0, 即ssl_verify_ok即可
1 2 3 4 5 | enum ssl_verify_result_t BORINGSSL_ENUM_INT { ssl_verify_ok, ssl_verify_invalid, ssl_verify_retry,}; |
代码编写
首先获取一下SSL_CTX_set_custom_verify
1 2 3 4 5 6 | function main() { Java.perform(function () { let SSL_CTX_set_custom_verify = Module.getExportByName('libsscronet.so', 'SSL_CTX_set_custom_verify'); }}setImmediate(main); |
spwan模式启动下应用frida -U -f com.ss.xxx.xxx.aweme -l byteDance.js
注入后提示报错: Error: unable to find module 'libsscronet.so'
很明显, 问题的原因在于注入的时机过早, so还没有加载进来, 解决办法有2个:
setTimeout(main, 3000);延时执行函数- hook系统函数, 监听so加载
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | function onLoad(name, callback) { //void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo);//原型 const android_dlopen_ext = Module.findExportByName(null, "android_dlopen_ext"); if (android_dlopen_ext != null) { Interceptor.attach(android_dlopen_ext, { onEnter: function (args) { if (args[0].readCString().indexOf(name) !== -1) { this.hook = true; } }, onLeave: function (retval) { if (this.hook) { callback(); } } }); }}onLoad(soName, () => { let SSL_CTX_set_custom_verify = Module.getExportByName('libsscronet.so', 'SSL_CTX_set_custom_verify'); if (SSL_CTX_set_custom_verify != null) { Interceptor.attach(SSL_CTX_set_custom_verify, { onEnter: function (args) { Interceptor.attach(args[2], { onLeave: function (retval) { if (retval > 0x0) retval.replace(0x0); } }); } }); }}); |
当监听到so被加载时进行hook操作, hook到SSL_CTX_set_custom_verify后, 获取参数3并hook它, 让此函数执行完成后的返回值保持为0即可
效果图
完整代码已经上传至github
错了而已~