基于dalvik模式下的Xposed Hook开发的某加固脱壳工具

本文博客地址：http://blog.csdn.net/qq1084283172/article/details/77966109

这段时间好好的学习了一下Android加固相关的知识和流程也大致把Android加固的一些思路理清楚了，不巧在博客上看到了这篇文章《某加固使用xposed脱壳》感觉还不错，正好有时间可以学习一下这款基于Xposed Hook框架开发的某加固脱壳工具，原作者的博客已经找不到但是作者已经给出了主要的实现代码，我在作者给出的原代码基础上稍微做了一下修改和优化并且在Android Nexus 5手机上测试某加固的脱壳，成功得到了某加固解密后的dex文件。在进行源码分析之前，你需要了解Xposed Hook框架模块编写相关的知识，还不了解的可以先看下我前面的博客《Xposed框架之函数Hook学习》。Android加固的实现是基于DexClassLoader的加载流程来实现的，具体详细的流程后面有时间再整理一下，因此这里使用Xposed Hook框架来脱某加固壳的工具也是基于DexClassLoader的加载流程来实现的。

下图是DexClassLoader在整个java层的实现流程：

从DexClassLoader到openDexFileNative函数的整个流程下来，DexClassLoader的java层实现全部完成，openDexFileNative之后是由native层函数实现，暂时不关心；dex文件的加固是基于DexClassLoader的加载流程而来的，dex文件优化为odex文件后加载到apk进程的内存中返回是mCookie值，这个mCookie值就是dex文件加载到内存之后的镜像描述结构体指针DexOrJar* ，DexOrJar结构体的实现如下图所示：

http://androidxref.com/4.4.4_r1/xref/dalvik/vm/native/dalvik_system_DexFile.cpp#DexOrJar

/* * Internal struct for managing DexFile. */struct DexOrJar {// 描述的dex文件或者jar文件的路径    char*       fileName;// 是否是dex文件的标识    bool        isDex;    bool        okayToFree;// 描述dex文件内存加载镜像odex文件的结构体    RawDexFile* pRawDexFile;// 描述内存加载后的jar文件的结构体    JarFile*    pJarFile;    u1*         pDexMemory; // malloc()ed memory, if any};

openDexFileNative在native层对应的实现函数是 Dalvik_dalvik_system_DexFile_openDexFileNative。

http://androidxref.com/4.4.4_r1/xref/dalvik/vm/native/dalvik_system_DexFile.cpp#151

// 对应函数的注册结构体const DalvikNativeMethod dvm_dalvik_system_DexFile[] = {    { "openDexFileNative",  "(Ljava/lang/String;Ljava/lang/String;I)I",        Dalvik_dalvik_system_DexFile_openDexFileNative },    { "openDexFile",        "([B)I",        Dalvik_dalvik_system_DexFile_openDexFile_bytearray },    { "closeDexFile",       "(I)V",        Dalvik_dalvik_system_DexFile_closeDexFile },    { "defineClassNative",  "(Ljava/lang/String;Ljava/lang/ClassLoader;I)Ljava/lang/Class;",        Dalvik_dalvik_system_DexFile_defineClassNative },    { "getClassNameList",   "(I)[Ljava/lang/String;",        Dalvik_dalvik_system_DexFile_getClassNameList },    { "isDexOptNeeded",     "(Ljava/lang/String;)Z",        Dalvik_dalvik_system_DexFile_isDexOptNeeded },    { NULL, NULL, NULL },};

/* * private static int openDexFileNative(String sourceName, String outputName, *     int flags) throws IOException * * Open a DEX file, returning a pointer to our internal data structure. * * "sourceName" should point to the "source" jar or DEX file. * * If "outputName" is NULL, the DEX code will automatically find the * "optimized" version in the cache directory, creating it if necessary. * If it's non-NULL, the specified file will be used instead. * * TODO: at present we will happily open the same file more than once. * To optimize this away we could search for existing entries in the hash * table and refCount them.  Requires atomic ops or adding "synchronized" * to the non-native code that calls here. * * TODO: should be using "long" for a pointer. */static void Dalvik_dalvik_system_DexFile_openDexFileNative(const u4* args,    JValue* pResult){    StringObject* sourceNameObj = (StringObject*) args[0];    StringObject* outputNameObj = (StringObject*) args[1];    DexOrJar* pDexOrJar = NULL;    JarFile* pJarFile;    RawDexFile* pRawDexFile;    char* sourceName;    char* outputName;    if (sourceNameObj == NULL) {        dvmThrowNullPointerException("sourceName == null");        RETURN_VOID();    }    sourceName = dvmCreateCstrFromString(sourceNameObj);    if (outputNameObj != NULL)        outputName = dvmCreateCstrFromString(outputNameObj);    else        outputName = NULL;    /*     * We have to deal with the possibility that somebody might try to     * open one of our bootstrap class DEX files.  The set of dependencies     * will be different, and hence the results of optimization might be     * different, which means we'd actually need to have two versions of     * the optimized DEX: one that only knows about part of the boot class     * path, and one that knows about everything in it.  The latter might     * optimize field/method accesses based on a class that appeared later     * in the class path.     *     * We can't let the user-defined class loader open it and start using     * the classes, since the optimized form of the code skips some of     * the method and field resolution that we would ordinarily do, and     * we'd have the wrong semantics.     *     * We have to reject attempts to manually open a DEX file from the boot     * class path.  The easiest way to do this is by filename, which works     * out because variations in name (e.g. "/system/framework/./ext.jar")     * result in us hitting a different dalvik-cache entry.  It's also fine     * if the caller specifies their own output file.     */    if (dvmClassPathContains(gDvm.bootClassPath, sourceName)) {        ALOGW("Refusing to reopen boot DEX '%s'", sourceName);        dvmThrowIOException(            "Re-opening BOOTCLASSPATH DEX files is not allowed");        free(sourceName);        free(outputName);        RETURN_VOID();    }    /*     * Try to open it directly as a DEX if the name ends with ".dex".     * If that fails (or isn't tried in the first place), try it as a     * Zip with a "classes.dex" inside.     */    if (hasDexExtension(sourceName)            && dvmRawDexFileOpen(sourceName, outputName, &pRawDexFile, false) == 0) {        ALOGV("Opening DEX file '%s' (DEX)", sourceName);        pDexOrJar = (DexOrJar*) malloc(sizeof(DexOrJar));        pDexOrJar->isDex = true;        pDexOrJar->pRawDexFile = pRawDexFile;        pDexOrJar->pDexMemory = NULL;    } else if (dvmJarFileOpen(sourceName, outputName, &pJarFile, false) == 0) {        ALOGV("Opening DEX file '%s' (Jar)", sourceName);        pDexOrJar = (DexOrJar*) malloc(sizeof(DexOrJar));        pDexOrJar->isDex = false;        pDexOrJar->pJarFile = pJarFile;        pDexOrJar->pDexMemory = NULL;    } else {        ALOGV("Unable to open DEX file '%s'", sourceName);        dvmThrowIOException("unable to open DEX file");    }    if (pDexOrJar != NULL) {        pDexOrJar->fileName = sourceName;        addToDexFileTable(pDexOrJar);    } else {        free(sourceName);    }    free(outputName);    RETURN_PTR(pDexOrJar);}

基于Xposed Hook开发的某加固脱壳工具是使用Xposed Hook框架Hook掉 DexClassLoader加载dex文件流程中类dalvik.system.DexFile的方法loadDex函数，等到loadDex函数返回时拿到dex文件内存加载后的mCookie值，然后内存dump出mCookie值描述的dex文件的值。类dalvik.system.DexFile的loadDex函数的实现如下：

http://androidxref.com/4.4.4_r1/xref/libcore/dalvik/src/main/java/dalvik/system/DexFile.java#141

    /**     * Open a DEX file, specifying the file in which the optimized DEX     * data should be written.  If the optimized form exists and appears     * to be current, it will be used; if not, the VM will attempt to     * regenerate it.     *     * This is intended for use by applications that wish to download     * and execute DEX files outside the usual application installation     * mechanism.  This function should not be called directly by an     * application; instead, use a class loader such as     * dalvik.system.DexClassLoader.     *     * @param sourcePathName     *  Jar or APK file with "classes.dex".  (May expand this to include     *  "raw DEX" in the future.)     * @param outputPathName     *  File that will hold the optimized form of the DEX data.     * @param flags     *  Enable optional features.  (Currently none defined.)     * @return     *  A new or previously-opened DexFile.     * @throws IOException     *  If unable to open the source or output file.     */    static public DexFile loadDex(String sourcePathName, String outputPathName,        int flags) throws IOException {        /*         * TODO: we may want to cache previously-opened DexFile objects.         * The cache would be synchronized with close().  This would help         * us avoid mapping the same DEX more than once when an app         * decided to open it multiple times.  In practice this may not         * be a real issue.         */        return new DexFile(sourcePathName, outputPathName, flags);    }

1.某加固脱壳工具Xposed Hook模块的编写，xxx.yyy.zzz为需要被脱壳的apk应用的包名，Xposed Hook掉类dalvik.system.DexFile的方法loadDex函数，获取到dex文件内存加载后的mCookie值，然后进行内存dex文件的dump处理。

package com.xposeddemo;import java.lang.reflect.Field;import dalvik.system.DexFile;import de.robv.android.xposed.IXposedHookLoadPackage;import de.robv.android.xposed.XC_MethodHook;import de.robv.android.xposed.XposedBridge;import de.robv.android.xposed.XposedHelpers;import de.robv.android.xposed.callbacks.XC_LoadPackage;import de.robv.android.xposed.callbacks.XC_LoadPackage.LoadPackageParam;public class Module implements IXposedHookLoadPackage {// native方法在libnativelib.so库文件中实现public native void dumpdex(int cookie);// 内部类class dumpThread implements Runnable {    int cookide;    public dumpThread(int cookide){        // 保存dex文件的mCookie值        this.cookide = cookide;    }    @Override    public void run() {            try {                // 休眠5s 时间足够壳修复dex            Thread.sleep(5000);                    } catch (InterruptedException e) {                    e.printStackTrace();        }                // 从内存中dump出解密后的内存dex文件        dumpdex(cookide);    }}@Overridepublic void handleLoadPackage(LoadPackageParam lpparam) throws Throwable {// 判断是否是要Hook的包名(xxx.yyy.zzz为需要脱壳的apk的包名)if (lpparam.packageName.equals("xxx.yyy.zzz")){XposedBridge.log("Loaded App:" + lpparam.packageName);    // 加载动态库文件libnativelib.so        System.load("/data/data/com.xposeddemo/lib/libnativelib.so");// 对类dalvik.system.DexFile的方法loadDex进行java Hook操作        // 获取到需要脱壳apk解密dex文件加载后返回的mCookie值        // 根据mCookie值进行内存dex文件的dump操作loadhooklib(lpparam);}} private void loadhooklib(XC_LoadPackage.LoadPackageParam lpparam) { // 对类dalvik.system.DexFile的方法loadDex进行dalvik模式下的java Hook操作// /libcore/dalvik/src/main/java/dalvik/system/DexFile.java// static public DexFile loadDex(String sourcePathName, String outputPathName, int flags)// http://androidxref.com/4.4.4_r1/xref/libcore/dalvik/src/main/java/dalvik/system/DexFile.java#141        XposedHelpers.findAndHookMethod(DexFile.class.getName(),         lpparam.classLoader, "loadDex",         String.class,         String.class, int.class,        new XC_MethodHook() {                    @Override                protected void afterHookedMethod(MethodHookParam param) throws Throwable {                                    if (!param.hasThrowable()) {                                            int falg = (Integer) param.args[2];                        // 加载的dex文件的路径                        String sourcePathName = (String) param.args[0];                        // dex被优化后的odex文件的存放路径                        String outputPathName = (String) param.args[1];                        XposedBridge.log("sourcePathName:" + sourcePathName + " outputPathName:"                         + outputPathName + " falg:" + falg);                                                // 获取dex文件被loadDex后返回的DexFile文件对象                        Object object = param.getResult();                        if (object instanceof DexFile) {                                                // 通过类反射获取DexFile类的私有成员mCookie的调用Field                            Field field = ((DexFile) object).getClass().getDeclaredField("mCookie");                            // 设置有权限                            field.setAccessible(true);                            // 获取到DexFile类的私有成员mCookie的值                            int cookie = field.getInt(object);                            // 恢复权限                            field.setAccessible(false);                            System.out.println("cookie:" + String.format("%x", cookie));                                                        // 创建线程对需要脱壳的apk进程进行内存dex的dump操作                            Thread thread = new Thread(new Module.dumpThread(cookie));                            // 启动线程                            thread.start();                        }                    }                }            });    }}

2.内存dump函数实现在动态库文件libnativelib.so中实现，先通过jni函数反射调用java方法获取到手机设备的scard卡的文件路径，然后将内存dump的dex文件保存到手机设备的scard卡文件路径中。原作者在nativelib.cpp文件的源码实现中使用了C++的stl模板库函数，考虑到代码中字符串的处理比较简单，去掉了C++的stl模板库函数的使用，直接使用C语言的相关函数替换掉了，并且做了一些小调整；原作者在处理 code_off偏移超过dex文件大小的加固类型脱壳时比较暴力，直接保存三倍dex文件长度；如果dex文件内存dump时，想处理的精细一些可以参考一下dexHunter代码的实现。

#include <jni.h>#include <stdio.h>#include <unistd.h>//#include <string>#include <android/log.h>#include "Object.h"//using std::string;char* getExternalStorageDirectory(JNIEnv* env);void printinfo(const char* tag, const char* fmt, ...);char* jstringTostring(JNIEnv* env, jstring str){    char* rtn = NULL;    jclass clsstring = env->FindClass("java/lang/String");    jstring strencode = env->NewStringUTF("utf-8");    jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B");    jbyteArray barr = (jbyteArray)env->CallObjectMethod(str, mid, strencode);    jsize alen = env->GetArrayLength(barr);    jbyte* ba = env->GetByteArrayElements(barr, JNI_FALSE);    if (alen > 0)    {        rtn = (char*)malloc(alen + 1);        memcpy(rtn, ba, alen);        rtn[alen] = 0;    }    env->ReleaseByteArrayElements(barr, ba, 0);    return rtn;}// 通过jni函数反射调用java方法获取到设备的scard卡的文件路径char* getExternalStorageDirectory(JNIEnv* env){    jclass Environment = env->FindClass("android/os/Environment");    if (Environment != NULL)    {        //Messageprint::printinfo("util", "Environment class have found");        jmethodID getExternalStorageDirectoryID = env->GetStaticMethodID(Environment,        "getExternalStorageDirectory", "()Ljava/io/File;");        if (getExternalStorageDirectoryID != NULL)        {            jobject fileobject = env->CallStaticObjectMethod(Environment, getExternalStorageDirectoryID);            jclass Fileclass = env->FindClass("java/io/File");            jmethodID getAbsolutePathId = env->GetMethodID(Fileclass, "getAbsolutePath", "()Ljava/lang/String;");            jstring jstringPath = (jstring)env->CallObjectMethod(fileobject, getAbsolutePathId);            char* StorageDirectoryPath = jstringTostring(env, jstringPath);            return StorageDirectoryPath;        }    }    return NULL;}// 使用了stl的库函数#ifdef __cplusplusextern "C" {#endif// 调用native层实现的jni方法dumpdexJNIEXPORT void JNICALL Java_com_xposeddemo_Module_dumpdex(JNIEnv *env, jobject instance, jint cookie) {DexOrJar* pDexOrJar = (DexOrJar*)cookie;DvmDex* pDvmDex;//打印dex文件的内存加载路径printf("jni", pDexOrJar->fileName);// 判断当前mCookie值是否是dex文件的if (pDexOrJar->isDex){// 得到内存加载的odex文件的信息结构体pDvmDex = pDexOrJar->pRawDexFile->pDvmDex;}else{pDvmDex = pDexOrJar->pJarFile->pDvmDex;}// 获取到描述内存加载的odex文件信息的结构体DexFileDexFile* dexFile = pDvmDex->pDexFile;// 得到内存加载的odex文件的基地址（起始地址）MemMapping mapping = pDvmDex->memMap;printinfo("jni","MemMapping:addr:%x length:%x baseAddr:%x baseLength:%x", mapping.addr, mapping.length, mapping.baseAddr, mapping.baseLength);// 通过jni函数反射调用java方法获取到设备的scard卡的文件路径char* path = getExternalStorageDirectory(env);char szBufferDexPath[128];memset(szBufferDexPath, 0, sizeof(szBufferDexPath));memcpy(szBufferDexPath, path, strlen(path));// 拼接字符串得到dump的dex文件的路径strcat(szBufferDexPath, "/xxxx.dex");printinfo("dump dex path: %s", szBufferDexPath);// F_OK = 0if (!access(szBufferDexPath,  F_OK)){// 删除已经存在的文件remove(szBufferDexPath);}// 创建新文件保存dump的dex文件FILE* file = fopen(szBufferDexPath, "wb+");// 保存三倍dex文件长度(比较暴力，可以参考dexhunter的实现代码进行优化)fwrite(mapping.addr,mapping.length*3,1,file);// 关闭文件fclose(file);}#ifdef __cplusplus}#endif// 打印Log日志信息void printinfo(const char* tag, const char* fmt, ...){    va_list ap;    char buf[1024];    va_start(ap, fmt);    vsnprintf(buf, 1024, fmt, ap);    va_end(ap);    __android_log_write(ANDROID_LOG_INFO, tag, buf);}

3.jni目录需要的头文件 Object.h

#ifndef HELPTOOLCLIENT_OBJECT_H#define HELPTOOLCLIENT_OBJECT_H#include <stddef.h>#include <cstdint>#include <pthread.h>typedef uint8_t             u1;typedef uint16_t            u2;typedef uint32_t            u4;typedef uint64_t            u8;typedef int8_t              s1;typedef int16_t             s2;typedef int32_t             s4;typedef int64_t             s8;/* fwd decl */struct DataObject;struct InitiatingLoaderList;struct ClassObject;struct StringObject;struct ArrayObject;struct Method;struct ExceptionEntry;struct LineNumEntry;struct StaticField;struct InstField;struct Field;struct RegisterMap;struct Object;union JValue{    u1 z;    s1 b;    u2 c;    s2 s;    s4 i;    s8 j;    float f;    double d;    Object* l;};typedef void (*DalvikBridgeFunc)(const u4* args, JValue* pResult,                                 const Method* method, struct Thread* self);enum AccessFlags{    ACC_MIRANDA = 0x8000, // method (internal to VM)    JAVA_FLAGS_MASK = 0xffff, // bits set from Java sources (low 16)};typedef void (*DalvikNativeFunc)(const u4* args, JValue* pResult);enum ClassFlags{    CLASS_ISFINALIZABLE = (1 << 31), // class/ancestor overrides finalize()    CLASS_ISARRAY = (1 << 30), // class is a "[*"    CLASS_ISOBJECTARRAY = (1 << 29), // class is a "[L*" or "[[*"    CLASS_ISCLASS = (1 << 28), // class is *the* class Class    CLASS_ISREFERENCE = (1 << 27), // class is a soft/weak/phantom ref    // only ISREFERENCE is set --> soft            CLASS_ISWEAKREFERENCE = (1 << 26), // class is a weak reference    CLASS_ISFINALIZERREFERENCE = (1 << 25), // class is a finalizer reference    CLASS_ISPHANTOMREFERENCE = (1 << 24), // class is a phantom reference    CLASS_MULTIPLE_DEFS = (1 << 23), // DEX verifier: defs in multiple DEXs    /* unlike the others, these can be present in the optimized DEX file */            CLASS_ISOPTIMIZED = (1 << 17), // class may contain opt instrs    CLASS_ISPREVERIFIED = (1 << 16), // class has been pre-verified};#define EXPECTED_FILE_FLAGS \    (ACC_CLASS_MASK | CLASS_ISPREVERIFIED | CLASS_ISOPTIMIZED)#define SET_CLASS_FLAG(clazz, flag) \    do { (clazz)->accessFlags |= (flag); } while (0)#define CLEAR_CLASS_FLAG(clazz, flag) \    do { (clazz)->accessFlags &= ~(flag); } while (0)#define IS_CLASS_FLAG_SET(clazz, flag) \    (((clazz)->accessFlags & (flag)) != 0)#define GET_CLASS_FLAG_GROUP(clazz, flags) \    ((u4)((clazz)->accessFlags & (flags)))enum MethodFlags{    METHOD_ISWRITABLE = (1 << 31), // the method's code is writable};#define SET_METHOD_FLAG(method, flag) \    do { (method)->accessFlags |= (flag); } while (0)#define CLEAR_METHOD_FLAG(method, flag) \    do { (method)->accessFlags &= ~(flag); } while (0)#define IS_METHOD_FLAG_SET(method, flag) \    (((method)->accessFlags & (flag)) != 0)#define GET_METHOD_FLAG_GROUP(method, flags) \    ((u4)((method)->accessFlags & (flags)))enum ClassStatus{    CLASS_ERROR = -1,    CLASS_NOTREADY = 0,    CLASS_IDX = 1, /* loaded, DEX idx in super or ifaces */            CLASS_LOADED = 2, /* DEX idx values resolved */            CLASS_RESOLVED = 3, /* part of linking */            CLASS_VERIFYING = 4, /* in the process of being verified */            CLASS_VERIFIED = 5, /* logically part of linking; done pre-init */            CLASS_INITIALIZING = 6, /* class init in progress */            CLASS_INITIALIZED = 7, /* ready to go */};#define CLASS_WALK_SUPER ((unsigned int)(3))#define CLASS_SMALLEST_OFFSET (sizeof(struct Object))#define CLASS_BITS_PER_WORD (sizeof(unsigned long int) * 8)#define CLASS_OFFSET_ALIGNMENT 4#define CLASS_HIGH_BIT ((unsigned int)1 << (CLASS_BITS_PER_WORD - 1))#define _CLASS_BIT_NUMBER_FROM_OFFSET(byteOffset) \    (((unsigned int)(byteOffset) - CLASS_SMALLEST_OFFSET) / \     CLASS_OFFSET_ALIGNMENT)#define CLASS_CAN_ENCODE_OFFSET(byteOffset) \    (_CLASS_BIT_NUMBER_FROM_OFFSET(byteOffset) < CLASS_BITS_PER_WORD)#define CLASS_BIT_FROM_OFFSET(byteOffset) \    (CLASS_HIGH_BIT >> _CLASS_BIT_NUMBER_FROM_OFFSET(byteOffset))#define CLASS_OFFSET_FROM_CLZ(rshift) \    (((int)(rshift) * CLASS_OFFSET_ALIGNMENT) + CLASS_SMALLEST_OFFSET)struct InterfaceEntry{    ClassObject* clazz;    int* methodIndexArray;};struct Object{    ClassObject* clazz;    u4 lock;};#define DVM_OBJECT_INIT(obj, clazz_) \    dvmSetFieldObject(obj, OFFSETOF_MEMBER(Object, clazz), clazz_)struct DataObject : Object{    u4 instanceData[1];};struct StringObject : Object{    u4 instanceData[1];    int length() const;    int utfLength() const;    ArrayObject* array() const;    const u2* chars() const;};struct ArrayObject : Object{    u4 length;    u8 contents[1];};struct InitiatingLoaderList{    Object** initiatingLoaders;    int initiatingLoaderCount;};struct Field{    ClassObject* clazz; /* class in which the field is declared */    const char* name;    const char* signature; /* e.g. "I", "[C", "Landroid/os/Debug;" */    u4 accessFlags;};struct StaticField : Field{    JValue value; /* initially set from DEX for primitives */};struct InstField : Field{    int byteOffset;};#define CLASS_FIELD_SLOTS   4enum PrimitiveType{    PRIM_NOT = 0, /* value is a reference type, not a primitive type */            PRIM_VOID = 1,    PRIM_BOOLEAN = 2,    PRIM_BYTE = 3,    PRIM_SHORT = 4,    PRIM_CHAR = 5,    PRIM_INT = 6,    PRIM_LONG = 7,    PRIM_FLOAT = 8,    PRIM_DOUBLE = 9,};// java类的描述结构体struct ClassObject : Object{    u4 instanceData[CLASS_FIELD_SLOTS];    const char* descriptor;    char* descriptorAlloc;    u4 accessFlags;    u4 serialNumber;    void* pDvmDex;    ClassStatus status;    ClassObject* verifyErrorClass;    u4 initThreadId;    size_t objectSize;    ClassObject* elementClass;    int arrayDim;    PrimitiveType primitiveType;    ClassObject* super;    Object* classLoader;    InitiatingLoaderList initiatingLoaderList;    int interfaceCount;    ClassObject** interfaces;    int directMethodCount;    Method* directMethods;    int virtualMethodCount;    Method* virtualMethods;    int vtableCount;    Method** vtable;    int iftableCount;    InterfaceEntry* iftable;    int ifviPoolCount;    int* ifviPool;    int ifieldCount;    int ifieldRefCount; // number of fields that are object refs    InstField* ifields;    u4 refOffsets;    /* source file name, if known */    const char* sourceFile;    int sfieldCount;    StaticField sfields[]; /* MUST be last item */};struct DexProto{    const void * dexFile; /* file the idx refers to */    u4 protoIdx; /* index into proto_ids table of dexFile */};struct Method{    /* the class we are a part of */    ClassObject* clazz;    u4 accessFlags;    u2 methodIndex;    u2 registersSize; /* ins + locals */    u2 outsSize;    u2 insSize;    /* method name, e.g. "<init>" or "eatLunch" */    const char* name;    DexProto prototype;    const char* shorty;    const u2* insns; /* instructions, in memory-mapped .dex */    int jniArgInfo;    DalvikBridgeFunc nativeFunc;    bool fastJni;    bool noRef;    bool shouldTrace;    const RegisterMap* registerMap;    /* set if method was called during method profiling */    bool inProfile;};enum{    ACC_PUBLIC = 0x00000001, // class, field, method, ic    ACC_PRIVATE = 0x00000002, // field, method, ic    ACC_PROTECTED = 0x00000004, // field, method, ic    ACC_STATIC = 0x00000008, // field, method, ic    ACC_FINAL = 0x00000010, // class, field, method, ic    ACC_SYNCHRONIZED = 0x00000020, // method (only allowed on natives)    ACC_SUPER = 0x00000020, // class (not used in Dalvik)    ACC_VOLATILE = 0x00000040, // field    ACC_BRIDGE = 0x00000040, // method (1.5)    ACC_TRANSIENT = 0x00000080, // field    ACC_VARARGS = 0x00000080, // method (1.5)    ACC_NATIVE = 0x00000100, // method    ACC_INTERFACE = 0x00000200, // class, ic    ACC_ABSTRACT = 0x00000400, // class, method, ic    ACC_STRICT = 0x00000800, // method    ACC_SYNTHETIC = 0x00001000, // field, method, ic    ACC_ANNOTATION = 0x00002000, // class, ic (1.5)    ACC_ENUM = 0x00004000, // class, field, ic (1.5)    ACC_CONSTRUCTOR = 0x00010000, // method (Dalvik only)    ACC_DECLARED_SYNCHRONIZED =    0x00020000, // method (Dalvik only)    ACC_CLASS_MASK =    (ACC_PUBLIC | ACC_FINAL | ACC_INTERFACE | ACC_ABSTRACT     | ACC_SYNTHETIC | ACC_ANNOTATION | ACC_ENUM),    ACC_INNER_CLASS_MASK =    (ACC_CLASS_MASK | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC),    ACC_FIELD_MASK =    (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL     | ACC_VOLATILE | ACC_TRANSIENT | ACC_SYNTHETIC | ACC_ENUM),    ACC_METHOD_MASK =    (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL     | ACC_SYNCHRONIZED | ACC_BRIDGE | ACC_VARARGS | ACC_NATIVE     | ACC_ABSTRACT | ACC_STRICT | ACC_SYNTHETIC | ACC_CONSTRUCTOR     | ACC_DECLARED_SYNCHRONIZED),};bool dvmIsPublicMethod(const Method* method){    return (method->accessFlags & ACC_PUBLIC) != 0;}bool dvmIsPrivateMethod(const Method* method){    return (method->accessFlags & ACC_PRIVATE) != 0;}bool dvmIsStaticMethod(const Method* method){    return (method->accessFlags & ACC_STATIC) != 0;}bool dvmIsSynchronizedMethod(const Method* method){    return (method->accessFlags & ACC_SYNCHRONIZED) != 0;}bool dvmIsDeclaredSynchronizedMethod(const Method* method){    return (method->accessFlags & ACC_DECLARED_SYNCHRONIZED) != 0;}bool dvmIsFinalMethod(const Method* method){    return (method->accessFlags & ACC_FINAL) != 0;}bool dvmIsNativeMethod(const Method* method){    return (method->accessFlags & ACC_NATIVE) != 0;}bool dvmIsAbstractMethod(const Method* method){    return (method->accessFlags & ACC_ABSTRACT) != 0;}bool dvmIsSyntheticMethod(const Method* method){    return (method->accessFlags & ACC_SYNTHETIC) != 0;}bool dvmIsMirandaMethod(const Method* method){    return (method->accessFlags & ACC_MIRANDA) != 0;}bool dvmIsConstructorMethod(const Method* method){    return *method->name == '<';}/* Dalvik puts private, static, and constructors into non-virtual table */bool dvmIsDirectMethod(const Method* method){    return dvmIsPrivateMethod(method) ||           dvmIsStaticMethod(method) ||           dvmIsConstructorMethod(method);}/* Get whether the given method has associated bytecode. This is the* case for methods which are neither native nor abstract. */bool dvmIsBytecodeMethod(const Method* method){    return (method->accessFlags & (ACC_NATIVE | ACC_ABSTRACT)) == 0;}bool dvmIsProtectedField(const Field* field){    return (field->accessFlags & ACC_PROTECTED) != 0;}bool dvmIsStaticField(const Field* field){    return (field->accessFlags & ACC_STATIC) != 0;}bool dvmIsFinalField(const Field* field){    return (field->accessFlags & ACC_FINAL) != 0;}bool dvmIsVolatileField(const Field* field){    return (field->accessFlags & ACC_VOLATILE) != 0;}bool dvmIsInterfaceClass(const ClassObject* clazz){    return (clazz->accessFlags & ACC_INTERFACE) != 0;}bool dvmIsPublicClass(const ClassObject* clazz){    return (clazz->accessFlags & ACC_PUBLIC) != 0;}bool dvmIsFinalClass(const ClassObject* clazz){    return (clazz->accessFlags & ACC_FINAL) != 0;}bool dvmIsAbstractClass(const ClassObject* clazz){    return (clazz->accessFlags & ACC_ABSTRACT) != 0;}bool dvmIsAnnotationClass(const ClassObject* clazz){    return (clazz->accessFlags & ACC_ANNOTATION) != 0;}bool dvmIsPrimitiveClass(const ClassObject* clazz){    return clazz->primitiveType != PRIM_NOT;}/* linked, here meaning prepared and resolved */bool dvmIsClassLinked(const ClassObject* clazz){    return clazz->status >= CLASS_RESOLVED;}/* has class been verified? */bool dvmIsClassVerified(const ClassObject* clazz){    return clazz->status >= CLASS_VERIFIED;}bool dvmIsClassInitialized(const ClassObject* clazz){    return (clazz->status == CLASS_INITIALIZED);}/* annotation constants */enum{    kDexVisibilityBuild = 0x00, /* annotation visibility */            kDexVisibilityRuntime = 0x01,    kDexVisibilitySystem = 0x02,    kDexAnnotationByte = 0x00,    kDexAnnotationShort = 0x02,    kDexAnnotationChar = 0x03,    kDexAnnotationInt = 0x04,    kDexAnnotationLong = 0x06,    kDexAnnotationFloat = 0x10,    kDexAnnotationDouble = 0x11,    kDexAnnotationString = 0x17,    kDexAnnotationType = 0x18,    kDexAnnotationField = 0x19,    kDexAnnotationMethod = 0x1a,    kDexAnnotationEnum = 0x1b,    kDexAnnotationArray = 0x1c,    kDexAnnotationAnnotation = 0x1d,    kDexAnnotationNull = 0x1e,    kDexAnnotationBoolean = 0x1f,    kDexAnnotationValueTypeMask = 0x1f, /* low 5 bits */            kDexAnnotationValueArgShift = 5,};/* map item type codes */enum{    kDexTypeHeaderItem = 0x0000,    kDexTypeStringIdItem = 0x0001,    kDexTypeTypeIdItem = 0x0002,    kDexTypeProtoIdItem = 0x0003,    kDexTypeFieldIdItem = 0x0004,    kDexTypeMethodIdItem = 0x0005,    kDexTypeClassDefItem = 0x0006,    kDexTypeMapList = 0x1000,    kDexTypeTypeList = 0x1001,    kDexTypeAnnotationSetRefList = 0x1002,    kDexTypeAnnotationSetItem = 0x1003,    kDexTypeClassDataItem = 0x2000,    kDexTypeCodeItem = 0x2001,    kDexTypeStringDataItem = 0x2002,    kDexTypeDebugInfoItem = 0x2003,    kDexTypeAnnotationItem = 0x2004,    kDexTypeEncodedArrayItem = 0x2005,    kDexTypeAnnotationsDirectoryItem = 0x2006,};/* auxillary data section chunk codes */enum{    kDexChunkClassLookup = 0x434c4b50, /* CLKP */            kDexChunkRegisterMaps = 0x524d4150, /* RMAP */            kDexChunkEnd = 0x41454e44, /* AEND */};/* debug info opcodes and constants */enum{    DBG_END_SEQUENCE = 0x00,    DBG_ADVANCE_PC = 0x01,    DBG_ADVANCE_LINE = 0x02,    DBG_START_LOCAL = 0x03,    DBG_START_LOCAL_EXTENDED = 0x04,    DBG_END_LOCAL = 0x05,    DBG_RESTART_LOCAL = 0x06,    DBG_SET_PROLOGUE_END = 0x07,    DBG_SET_EPILOGUE_BEGIN = 0x08,    DBG_SET_FILE = 0x09,    DBG_FIRST_SPECIAL = 0x0a,    DBG_LINE_BASE = -4,    DBG_LINE_RANGE = 15,};enum{    kSHA1DigestLen = 20,    kSHA1DigestOutputLen = kSHA1DigestLen * 2 + 1};/** Direct-mapped "header_item" struct.*/struct DexHeader{    u1 magic[8]; /* includes version number */    u4 checksum; /* adler32 checksum */    u1 signature[kSHA1DigestLen]; /* SHA-1 hash */    u4 fileSize; /* length of entire file */    u4 headerSize; /* offset to start of next section */    u4 endianTag;    u4 linkSize;    u4 linkOff;    u4 mapOff;    u4 stringIdsSize;    u4 stringIdsOff;    u4 typeIdsSize;    u4 typeIdsOff;    u4 protoIdsSize;    u4 protoIdsOff;    u4 fieldIdsSize;    u4 fieldIdsOff;    u4 methodIdsSize;    u4 methodIdsOff;    u4 classDefsSize;    u4 classDefsOff;    u4 dataSize;    u4 dataOff;};/** Direct-mapped "map_item".*/struct DexMapItem{    u2 type; /* type code (see kDexType* above) */    u2 unused;    u4 size; /* count of items of the indicated type */    u4 offset; /* file offset to the start of data */};/** Direct-mapped "map_list".*/struct DexMapList{    u4 size; /* #of entries in list */    DexMapItem list[1]; /* entries */};/** Direct-mapped "string_id_item".*/struct DexStringId{    u4 stringDataOff; /* file offset to string_data_item */};/** Direct-mapped "type_id_item".*/struct DexTypeId{    u4 descriptorIdx; /* index into stringIds list for type descriptor */};/** Direct-mapped "field_id_item".*/struct DexFieldId{    u2 classIdx; /* index into typeIds list for defining class */    u2 typeIdx; /* index into typeIds for field type */    u4 nameIdx; /* index into stringIds for field name */};/** Direct-mapped "method_id_item".*/struct DexMethodId{    u2 classIdx; /* index into typeIds list for defining class */    u2 protoIdx; /* index into protoIds for method prototype */    u4 nameIdx; /* index into stringIds for method name */};/** Direct-mapped "proto_id_item".*/struct DexProtoId{    u4 shortyIdx; /* index into stringIds for shorty descriptor */    u4 returnTypeIdx; /* index into typeIds list for return type */    u4 parametersOff; /* file offset to type_list for parameter types */};/** Direct-mapped "class_def_item".*/struct DexClassDef{    u4 classIdx; /* index into typeIds for this class */    u4 accessFlags;    u4 superclassIdx; /* index into typeIds for superclass */    u4 interfacesOff; /* file offset to DexTypeList */    u4 sourceFileIdx; /* index into stringIds for source file name */    u4 annotationsOff; /* file offset to annotations_directory_item */    u4 classDataOff; /* file offset to class_data_item */    u4 staticValuesOff; /* file offset to DexEncodedArray */};/** Direct-mapped "type_item".*/struct DexTypeItem{    u2 typeIdx; /* index into typeIds */};/** Direct-mapped "type_list".*/struct DexTypeList{    u4 size; /* #of entries in list */    DexTypeItem list[1]; /* entries */};typedef struct DexMapId{    u2 type; /*Section type*/    u2 unused; /*unused*/    u4 size; /* section size*/    u4 offset; /* section offset */} DexMapId;/** Direct-mapped "code_item".** The "catches" table is used when throwing an exception,* "debugInfo" is used when displaying an exception stack trace or* debugging. An offset of zero indicates that there are no entries.*/struct DexCode{    u2 registersSize;    u2 insSize;    u2 outsSize;    u2 triesSize;    u4 debugInfoOff; /* file offset to debug info stream */    u4 insnsSize; /* size of the insns array, in u2 units */    u2 insns[1];    /* followed by optional u2 padding */    /* followed by try_item[triesSize] */    /* followed by uleb128 handlersSize */    /* followed by catch_handler_item[handlersSize] */};/** Direct-mapped "try_item".*/struct DexTry{    u4 startAddr; /* start address, in 16-bit code units */    u2 insnCount; /* instruction count, in 16-bit code units */    u2 handlerOff; /* offset in encoded handler data to handlers */};/** Link table.  Currently undefined.*/struct DexLink{    u1 bleargh;};/** Direct-mapped "annotations_directory_item".*/struct DexAnnotationsDirectoryItem{    u4 classAnnotationsOff; /* offset to DexAnnotationSetItem */    u4 fieldsSize; /* count of DexFieldAnnotationsItem */    u4 methodsSize; /* count of DexMethodAnnotationsItem */    u4 parametersSize; /* count of DexParameterAnnotationsItem */    /* followed by DexFieldAnnotationsItem[fieldsSize] */    /* followed by DexMethodAnnotationsItem[methodsSize] */    /* followed by DexParameterAnnotationsItem[parametersSize] */};/** Direct-mapped "field_annotations_item".*/struct DexFieldAnnotationsItem{    u4 fieldIdx;    u4 annotationsOff; /* offset to DexAnnotationSetItem */};/** Direct-mapped "method_annotations_item".*/struct DexMethodAnnotationsItem{    u4 methodIdx;    u4 annotationsOff; /* offset to DexAnnotationSetItem */};/** Direct-mapped "parameter_annotations_item".*/struct DexParameterAnnotationsItem{    u4 methodIdx;    u4 annotationsOff; /* offset to DexAnotationSetRefList */};/** Direct-mapped "annotation_set_ref_item".*/struct DexAnnotationSetRefItem{    u4 annotationsOff; /* offset to DexAnnotationSetItem */};/** Direct-mapped "annotation_set_ref_list".*/struct DexAnnotationSetRefList{    u4 size;    DexAnnotationSetRefItem list[1];};/** Direct-mapped "annotation_set_item".*/struct DexAnnotationSetItem{    u4 size;    u4 entries[1]; /* offset to DexAnnotationItem */};/** Direct-mapped "annotation_item".** NOTE: this structure is byte-aligned.*/struct DexAnnotationItem{    u1 visibility;    u1 annotation[1]; /* data in encoded_annotation format */};/** Direct-mapped "encoded_array".** NOTE: this structure is byte-aligned.*/struct DexEncodedArray{    u1 array[1]; /* data in encoded_array format */};/** Lookup table for classes.  It provides a mapping from class name to* class definition.  Used by dexFindClass().** We calculate this at DEX optimization time and embed it in the file so we* don't need the same hash table in every VM.  This is slightly slower than* a hash table with direct pointers to the items, but because it's shared* there's less of a penalty for using a fairly sparse table.*/struct DexClassLookup{    int size; // total size, including "size"    int numEntries; // size of table[]; always power of 2    struct    {        u4 classDescriptorHash; // class descriptor hash code        int classDescriptorOffset; // in bytes, from start of DEX        int classDefOffset; // in bytes, from start of DEX    } table[1];};/** Header added by DEX optimization pass.  Values are always written in* local byte and structure padding.  The first field (magic + version)* is guaranteed to be present and directly readable for all expected* compiler configurations; the rest is version-dependent.** Try to keep this simple and fixed-size.*/struct DexOptHeader{    u1 magic[8]; /* includes version number */    u4 dexOffset; /* file offset of DEX header */    u4 dexLength;    u4 depsOffset; /* offset of optimized DEX dependency table */    u4 depsLength;    u4 optOffset; /* file offset of optimized data tables */    u4 optLength;    u4 flags; /* some info flags */    u4 checksum; /* adler32 checksum covering deps/opt */    /* pad for 64-bit alignment if necessary */};#define DEX_OPT_FLAG_BIG            (1<<1)  /* swapped to big-endian */#define DEX_INTERFACE_CACHE_SIZE    128     /* must be power of 2 *//** Structure representing a DEX file.** Code should regard DexFile as opaque, using the API calls provided here* to access specific structures.*/struct DexFile{    /* directly-mapped "opt" header */    const DexOptHeader* pOptHeader;    /* pointers to directly-mapped structs and arrays in base DEX */    const DexHeader* pHeader;    const DexStringId* pStringIds;    const DexTypeId* pTypeIds;    const DexFieldId* pFieldIds;    const DexMethodId* pMethodIds;    const DexProtoId* pProtoIds;    const DexClassDef* pClassDefs;    const DexLink* pLinkData;    /*    * These are mapped out of the "auxillary" section, and may not be    * included in the file.    */    const DexClassLookup* pClassLookup;    const void* pRegisterMapPool; // RegisterMapClassPool    /* points to start of DEX file data */    const u1* baseAddr;    /* track memory overhead for auxillary structures */    int overhead;    /* additional app-specific data structures associated with the DEX */    //void*               auxData;};struct MemMapping{    void* addr; /* start of data */    size_t length; /* length of data */    void* baseAddr; /* page-aligned base address */    size_t baseLength; /* length of mapping */};struct DvmDex{    /* pointer to the DexFile we're associated with */    DexFile* pDexFile;    /* clone of pDexFile->pHeader (it's used frequently enough) */    const DexHeader* pHeader;    /* interned strings; parallel to "stringIds" */    struct StringObject** pResStrings;    /* resolved classes; parallel to "typeIds" */    struct ClassObject** pResClasses;    /* resolved methods; parallel to "methodIds" */    struct Method** pResMethods;    /* resolved instance fields; parallel to "fieldIds" */    /* (this holds both InstField and StaticField) */    struct Field** pResFields;    /* interface method lookup cache */    struct AtomicCache* pInterfaceCache;    /* shared memory region with file contents */    bool isMappedReadOnly;    MemMapping memMap;    jobject dex_object;    /* lock ensuring mutual exclusion during updates */    pthread_mutex_t modLock;};struct JarFile{    u4* Nocare[9];    char* cacheFileName;    DvmDex* pDvmDex;};struct RawDexFile{    char* cacheFileName;    struct DvmDex* pDvmDex; //DvmDex*};struct DexOrJar{    char* fileName;    bool isDex;    bool okayToFree;    RawDexFile* pRawDexFile;    JarFile* pJarFile;    u1* pDexMemory; // malloc()ed memory, if any};#endif //HELPTOOLCLIENT_OBJECT_H

4.当前工程ndk编译需要的配置文件Android.mk

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE    := nativelibLOCAL_SRC_FILES := nativelib.cpp# 支持log日志打印需要加载链接的库    LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog    include $(BUILD_SHARED_LIBRARY)

5.使用当前Xposed Hook工具进行某加固脱壳的测试结果。

使用JEB工具反编译脱壳成功后的odex文件，结果如下图：

总之呢，这个工具对付一般免费版的某数字加固保、某加密、某梆梆加固还是可以的，企业估计不行还需要修改和优化，有兴趣的可以测试一下其他的免费版的加固产品，可以把样本和结果反馈下，我修改一下。

重要参考：

某加固使用xposed脱壳