Trace all binder-funcion calls on android-platform

Overview

BinderHackDemo

trace all binder-funcion calls on android-platform

该demo展示了如何使用libbinderhack.so模块,trace-app自身进程binder调用情况

您可以通过该次提交,查看如何使用libbinderhack.so

libbinderhack.so用途:

1.可以作为一个逆向工具,分析app行为

2.可以作为一款性能分析工具,查看进程是否有非必要的、频繁跨进程调用binder

3.可以作为一款安全工具,分析本app是否有不合规的api调用(可以参考工信部移动互联网安全)

缺点:

1.目前只支持安卓5.0以上平台(art)

2.由于hook的仅仅是BinderProxy.transactNative函数,所以仅能trace到proxy调用

输出的demo样例:

com.example.myapplication D/WHULZZ: android.content.pm.IPackageManager getInstalledApplications
com.example.myapplication D/WHULZZ: android.view.accessibility.IAccessibilityManager getEnabledAccessibilityServiceList
com.example.myapplication D/WHULZZ: android.app.IActivityTaskManager activityTopResumedStateLost
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager removeImeSurfaceFromWindow
com.example.myapplication D/WHULZZ: android.view.IWindowSession relayout
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager removeImeSurfaceFromWindow
com.example.myapplication D/WHULZZ: android.app.IActivityTaskManager activityStopped
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager removeImeSurfaceFromWindow
com.example.myapplication D/WHULZZ: android.view.accessibility.IAccessibilityManager getEnabledAccessibilityServiceList
com.example.myapplication D/WHULZZ: android.view.IWindowSession relayout
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager removeImeSurfaceFromWindow
com.example.myapplication D/WHULZZ: android.app.IActivityTaskManager getActivityOptions
com.example.myapplication D/WHULZZ: miui.security.ISecurityManager activityResume
com.example.myapplication D/WHULZZ: android.app.IActivityTaskManager activityResumed
com.example.myapplication D/WHULZZ: android.view.IWindowSession relayout
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager removeImeSurfaceFromWindow
com.example.myapplication D/WHULZZ: android.view.IWindowSession finishDrawing
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager removeImeSurfaceFromWindow
com.example.myapplication D/WHULZZ: android.app.IActivityTaskManager activityIdle
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager startInputOrWindowGainedFocus
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager reportPerceptible
com.example.myapplication D/WHULZZ: com.android.internal.view.IInputMethodManager removeImeSurfaceFromWindow

使用方式

1.必须在您的apk资源目录中提供bm.properties文件,并定义BinderCareEntry

image-bm-properties

该文件中定义了BinderCareEntry="java class name"

便于后文叙述,此java class name简称为ENTRY

BinderHackDemo中将此ENTRY定义为com.example.myapplication.MainActivity

该ENTRY会被libbinderhack.so加载时使用,如未定义,将导致link失败

2.必须在ENTRY class中定义这两个native-jni函数

正确声明这两个native函数:

必须将这两个函数放一起声明

    /**
     * start binder monitor
     */
    private static native void start();

    /**
     * end binder monitor
     */
    private static native void end();

错误声明方式如下:

private static native void start();

public void xx();//不能在start/end函数之间存放其他声明

private static native void end();

3.如果您只关注部分binder调用,可在ENTRY中提供getInterestBinders函数

您可以仿照BinderHackDemo中的样例:

getInstalledApplications HashSet pmFuncs = new HashSet<>(); pmFuncs.add("getInstalledApplications"); monitorBinderMap.put("android.content.pm.IPackageManager", pmFuncs); return monitorBinderMap; }">
    /**
     * This function is not necessary!
     * If not provided, binderhack will print all the binder calls.
     * This function will be called by native-c code.
     *
     * @return HashMap
    
     >. see demo below for detail
    
     */
    @Keep
    private static HashMap getInterestBinders() {
        //关注IActivityManager->activityPaused
        HashMap<String, Set<String>> monitorBinderMap = new HashMap<>();
        HashSet<String> amFuncs = new HashSet<>();
        amFuncs.add("activityPaused");
        monitorBinderMap.put("android.app.IActivityManager", amFuncs);

        //关注IPackageManager->getInstalledApplications
        HashSet<String> pmFuncs = new HashSet<>();
        pmFuncs.add("getInstalledApplications");
        monitorBinderMap.put("android.content.pm.IPackageManager", pmFuncs);
        return monitorBinderMap;
    }

4.如果您要拦截binder调用,您可以在ENTRY中提供transactStart/transactEnd函数

同样可以在样例中找到demo

transactStart

    /**
     *
     * @param interfaceName likely as android.content.pm.IPackageManager
     * @param funcName likely as getInstalledApplications
     * @param data see {@link android.os.IBinder}->transact(...)
     * @param reply see {@link android.os.IBinder}->transact(...)
     * @return TRUE represents you've decided to intercept the origin call.
     */
    @Keep
    private static boolean transactStart(Object interfaceName, Object funcName, Parcel data, Parcel reply) {
        Log.d("WHULZZ", String.format("transactStart %s %s", interfaceName, funcName));
        return false;
    }

transactEnd

    /**
     *
     * @param interfaceName likely as android.content.pm.IPackageManager
     * @param funcName likely as getInstalledApplications
     * @param data see {@link android.os.IBinder}->transact(...)
     * @param reply reply see {@link android.os.IBinder}->transact(...)
     * @param originRet this is the origin result
     * @return I advice you to use {@param originRet}
     */
    @Keep
    private static boolean transactEnd(Object interfaceName, Object funcName, Parcel data, Parcel reply, boolean originRet) {
        Log.d("WHULZZ", String.format("transactEnd %s %s", interfaceName, funcName));
        return originRet;
    }

libbinderhack.so模块后续也会开源,请耐心等候

欢迎脑暴...

contact with [email protected]

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