一、概述
最近由于换了工作,就忙了一段时间,但是一直也想学习点东西、总结点东西。今天就学习下android安全检测的手段之一,使用hook检测app是否获取个人隐私问题的方案吧。
VirtualXposed的工作原理简单来理解,就是先在手机上建立一个“虚拟空间”,需要在这个“虚拟空间”里面安装APP ,并且安装其对应的Xposed框架模块,这样就能让这个模块对该APP 起到作用了。 这种工作模式有点类似于电脑上的虚拟机,安装虚拟机之后,无论怎么折腾,都不会影响主系统的正常动作,而虚拟系统仍然有主系统的全部功能,所以VirtualXposed是一个免Root的虚拟空间方案。 安装到VirtualXposed中的APP,运行起来跟普通应用无任何差别,可以正常收发消息,接收推送,读取本机文件等。
Xposed 能做什么?
1.系统方法调用的检测
2.hook方法重新实现
3.检测变量是否被修改
二、如何检测制定的系统方法被调用呢?
首先肯定是需要部署VirtualXposed环境,这个步骤就不聊了,直接实现检测系统方法调用检测吧。
1、新建一个Android工程,之后引入XposedBridgeApi-82.jar。
2、在assets的xposed_init中配置监听Hook的实现。
3、清单文件中配置为插件工程。
不花里胡哨的了,直接上代码吧:
//imei- getDeviceId-无参 固定格式
XposedHelpers.findAndHookMethod(
android.telephony.TelephonyManager.class.getName(), // 需要hook的方法所在类的完整类名
lpparam.classLoader, // 类加载器,固定这么写就行了
"getDeviceId", // 需要hook的方法名
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getDeviceId()获取了imei";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getDeviceId()");
}
}
);
//imei-getDeviceId-有参
XposedHelpers.findAndHookMethod(
android.telephony.TelephonyManager.class.getName(),
lpparam.classLoader,
"getDeviceId",
int.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getDeviceId(int)获取了imei";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getDeviceId(1)");
}
}
);
//imei- getImei-无参 固定格式
XposedHelpers.findAndHookMethod(
android.telephony.TelephonyManager.class.getName(), // 需要hook的方法所在类的完整类名
lpparam.classLoader, // 类加载器,固定这么写就行了
"getImei", // 需要hook的方法名
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getImei()获取了imei";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getImei()");
}
}
);
//imei-getDeviceId-有参
XposedHelpers.findAndHookMethod(
android.telephony.TelephonyManager.class.getName(),
lpparam.classLoader,
"getImei",
int.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getImei(int)获取了imei";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getImei(1)");
}
}
);
//imsi
XposedHelpers.findAndHookMethod(
android.telephony.TelephonyManager.class.getName(),
lpparam.classLoader,
"getSubscriberId",
int.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getSubscriberId获取了imsi";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getSubscriberId()");
}
}
);
//mac
XposedHelpers.findAndHookMethod(
android.net.wifi.WifiInfo.class.getName(),
lpparam.classLoader,
"getMacAddress",
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getMacAddress()获取了mac地址";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getMacAcdress()");
}
}
);
//mac
XposedHelpers.findAndHookMethod(
java.net.NetworkInterface.class.getName(),
lpparam.classLoader,
"getHardwareAddress",
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getHardwareAddress()获取了mac地址";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getHardwareAddress()");
}
}
);
//android id https://www.52pojie.cn/thread-1063915-1-1.html
//android.provider.Settings.System.getString
XposedHelpers.findAndHookMethod(android.provider.Settings.System.class.getName(),
lpparam.classLoader,
"getString",
ContentResolver.class,
String.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
if (param == null || param.args == null) {
Log.e(TAG, "getString 参数为空!!!!!");
return;
}
String log = "检测到 调用Settings.Secure.getstring获取了" + param.args[1];
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("AndroidId()");
}
});
//获取定位
XposedHelpers.findAndHookMethod(
LocationManager.class.getName(),
lpparam.classLoader,
"getLastKnownLocation",
String.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getLastKnownLocation获取了GPS地址";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getLastKnownLocation()");
}
}
);
//获取任务列表 getRecentTasks
XposedHelpers.findAndHookMethod(
ActivityManager.class.getName(),
lpparam.classLoader,
"getRecentTasks",
int.class,
int.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getRecentTasks获取任务列表";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getRecentTasks()");
}
}
);
//获取任务列表 getRunningTasks
XposedHelpers.findAndHookMethod(
ActivityManager.class.getName(),
lpparam.classLoader,
"getRunningTasks",
int.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getRunningTasks(0)获取任务列表";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getRunningTasks()");
}
}
);
}
另外需要打印log,可以使用下面方法,这样就可以在logcat和VirtualXposed中同时输出log了。
public void printStackTree(String method) {
XposedBridge.log("***********************************");
XposedBridge.log(method + " 堆栈:---------------start----------------");
Log.e(TAG, "***********************************");
Log.e(TAG, method + " 堆栈:---------------start----------------");
Throwable ex = new Throwable();
StackTraceElement[] stackElements = ex.getStackTrace();
for (int i = 0; i < stackElements.length; i++) {
StackTraceElement element = stackElements[i];
String format = String.format("at %s.%s(%s:%d)",
element.getClassName(), element.getMethodName(), element
.getFileName(), element.getLineNumber());
XposedBridge.log(format);
Log.e(TAG, format);
}
XposedBridge.log(method + " 堆栈:---------------end----------------");
Log.e(TAG, method + " 堆栈:---------------end----------------");
}
三、hook修改返回值:
//imei- getDeviceId-无参 固定格式
XposedHelpers.findAndHookMethod(
android.telephony.TelephonyManager.class.getName(), // 需要hook的方法所在类的完整类名
lpparam.classLoader, // 类加载器,固定这么写就行了
"getDeviceId", // 需要hook的方法名
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) {
String log = "检测到 调用getDeviceId()获取了imei";
Log.e(TAG, log);
XposedBridge.log(log);
}
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
// super.afterHookedMethod(param);
printStackTree("getDeviceId()");
param.setResult("iamhookvalue");
}
}
);
参考资料:
定制Xposed框架:https://blog.csdn.net/qq_35834055/article/details/103256122
Xposed框架的检测和反制:https://blog.coderstory.cn/about-xposed/
使用:https://blog.csdn.net/weixin_42430341/article/details/113043216
干货:https://github.com/stormdzh/HookSources
https://github.com/stormdzh/HookCheck