去年下半年由于业务的需求，希望能够将frida的js脚本持久化到手机，只要APP启动就可以自行运行指定的脚本；一来希望可以脱离pc，二来可以为xposed增加没有的native hook能力，三就是部署以后方便通过命令行来更新脚本；
我想到了两个方案
好消息是两个方案目前都已经实现。方案一由于是去年完成的，使用的riru23版本的模板，现在的riru版本号已经25了，不知道是否能够兼容；再有就是开发比较早，几位同学觉得上手不容易，所以早早结束了开发，虽然功能完整但未达预期。因此今天先介绍方案二并开源。
我们大的产品叫做Xcube，而这个模块就叫做xcubebase；
frida-gumjs是frida武器库的js封装；官方提供了libfrida-gumjs.a的下载，可惜的是文档资料极少，代码看到吐血也只是摸清了一些关键函数的使用；官方提供了这个库的头文件，我们平时hook用的js脚本都可以用这个库来运行；
frida-gumjs.cpp中的代码如下：
再添加一个jni入口函数
将以上libfrida-gumjs.a和相关代码使用ndk编译为我们app可以加载的so
这样就得到了libxcubebase.so
为了方便使用，我把libxcubebase.so集成到了xposed的插件中，插件上有初始化功能，可以一键将libxcubebase.so、配置文件xcube.yaml导入到/data/local/tmp。
实现比较麻烦基本就是先从assets拷贝到/data/app/packagename/cache目录下，再复制到/data/local/tmp/。复制到/data/local/tmp这一步需要su权限，所以如果有提示su权限需要允许；
下面的代码是app加载so、执行js的核心代码
xcube.yaml是配置文件，规定了我们要hook的app及其要运行的js脚本，需要自行修改
源码今天会放出来。稍等一个午休
代码出来了，工程里libfrida-gumjs.a太大传不上去，我给压缩了，自己解压一下
https://github.com/svengong/xcubebase.git
gumjsHook(const char *scriptpath) {
...
...
script = gum_script_backend_create_sync(backend, "example", js, cancellable, &error);
g_assert (error == NULL);
gum_script_set_message_handler(script, on_message, NULL, NULL);
gum_script_load_sync(script, cancellable);
//执行脚本
context = g_main_context_get_thread_default();
while (g_main_context_pending(context))
g_main_context_iteration(context, FALSE);
...
}
gum_script_backend_create_sync中的js参数就是我们的hook脚本
gumjsHook(const char *scriptpath) {
...
...
script = gum_script_backend_create_sync(backend, "example", js, cancellable, &error);
g_assert (error == NULL);
gum_script_set_message_handler(script, on_message, NULL, NULL);
gum_script_load_sync(script, cancellable);
//执行脚本
context = g_main_context_get_thread_default();
while (g_main_context_pending(context))
g_main_context_iteration(context, FALSE);
...
}
gum_script_backend_create_sync中的js参数就是我们的hook脚本
extern "C"
JNIEXPORT void JNICALL Java_org_xtgo_xcube_base_XcubeBase_gumjsHook(
JNIEnv *env, jclass clazz, jstring script) {
const char *scriptpath = env->GetStringUTFChars(script, 0);
gumjsHook(scriptpath);
env->ReleaseStringUTFChars(script, scriptpath);
}
extern "C"
JNIEXPORT void JNICALL Java_org_xtgo_xcube_base_XcubeBase_gumjsHook(
JNIEnv *env, jclass clazz, jstring script) {
const char *scriptpath = env->GetStringUTFChars(script, 0);
gumjsHook(scriptpath);
env->ReleaseStringUTFChars(script, scriptpath);
}
add_library(gumjs STATIC IMPORTED)
set_target_properties(gumjs
PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libfrida-gumjs.a)
add_library(xcubebase SHARED frida-gumjs.cpp NativeEntry.cpp)
target_link_libraries(xcubebase gumjs ${log-lib})
add_library(gumjs STATIC IMPORTED)
set_target_properties(gumjs
PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libfrida-gumjs.a)
add_library(xcubebase SHARED frida-gumjs.cpp NativeEntry.cpp)
target_link_libraries(xcubebase gumjs ${log-lib})
private static String configPath = "/data/local/tmp/xcube/xcube.yaml";
public static boolean hooked = false;
@Override
public void handleLoadPackage(XC_LoadPackage.LoadPackageParam loadPackageParam) throws Throwable {
String remoteName = Utils.getRemoteName();
XcubeConfig config = new XcubeConfig(configPath);
if (!config.active || !config.contains(loadPackageParam.packageName)) {
return;
}
String script = config.getScriptPath(loadPackageParam.packageName);
Log.e(TAG, "current app packageName : " + loadPackageParam.packageName + ":" + remoteName);
XposedHelpers.findAndHookMethod(Application.class, "attach", Context.class, new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
Log.d(TAG, "attach beforeHookedMethod script:" + script);
if (hooked || !remoteName.isEmpty()) {
//只hook主进程一次
return;
}
try {
Context base = (Context) param.args[0];
File toPath = base.getDir("libs", Context.MODE_PRIVATE);
String libpath = "/data/local/tmp/xcube/";
String ABI = android.os.Process.is64Bit() ? "arm64-v8a" : "armeabi-v7a";
//System.loadlibrary使用的classloader是当前classloader，而param.args[0]是目标应用的classloader，二者不同
Log.d(TAG, "attach beforeHookedMethod toPath:" + toPath);
LoadLibraryUtil.loadSoFile(this.getClass().getClassLoader(), libpath + ABI, toPath);
System.loadLibrary("xcubebase");
Log.d(TAG, "script path :" + script);
gumjsHook(script);
hooked = true;
} catch (Throwable throwable) {
throwable.printStackTrace();
}
}
});
XposedHelpers.findAndHookMethod(Activity.class, "onCreate", Bundle.class, new XC_MethodHook() {
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
((Activity) param.thisObject).getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
});
}
private static String configPath = "/data/local/tmp/xcube/xcube.yaml";
public static boolean hooked = false;
@Override
public void handleLoadPackage(XC_LoadPackage.LoadPackageParam loadPackageParam) throws Throwable {
String remoteName = Utils.getRemoteName();
XcubeConfig config = new XcubeConfig(configPath);
if (!config.active || !config.contains(loadPackageParam.packageName)) {
return;
}
String script = config.getScriptPath(loadPackageParam.packageName);
Log.e(TAG, "current app packageName : " + loadPackageParam.packageName + ":" + remoteName);
XposedHelpers.findAndHookMethod(Application.class, "attach", Context.class, new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
Log.d(TAG, "attach beforeHookedMethod script:" + script);
if (hooked || !remoteName.isEmpty()) {
//只hook主进程一次
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最后于 2021-4-1 15:29
被svengong编辑
，原因： 修改标题
