前言：拼多多charles抓包分析发现跟商品相关的请求头里都带了一个anti-token的字段且每次都不一样,那么下面的操作就从分析anti-token开始了
1.jadx反编译直接搜索
选中跟http相关的类对这个方法进行打印堆栈
结合堆栈方法调用的情况找到具体anti-token是由拦截器类f.a方法调用的,在http.a.c()方法中生成并且http.p.e()方法中加入请求头
在http.a.c()方法中有个一个判断条件如果为true则走d.a().e()方法生成anti-token
如果为false则走j()方法生成anti-token
hook这个i()方法返回值可知获取商品详情接口返回值为false所以走的是j()方法进行计算anti-token。
SecureNative.deviceInfo3()方法生成,传入的str为pdd生成的固定id 一个字符串.
根据hook_libart 得到info3()方法是在libodd_secure.so中,那么ida打开看看这个so包
2.这部分我们采用unidbg+jnitrace+frida相结合的方式
unidbg前期准备的代码这里就不发了直接调用这个info3方法
这里提示调用gad()方法返回一个字符串那么frida hook这个方法拿到这个值 如下图 一个固定的字符串
16位长度看着像AES的密钥
继续补环境 这里简单补环境就不发了
补完简单的环境代码后,再次运行报这个错误 看错误应该是缺少文件 ,那么看看日志需要补那个文件
继续运行,没有返回值报空指针。execve()函数执行的时候程序exit了这里我们返回对象本身.
execve()函数执行的时候程序exit了
execve filename=/system/bin/sh, args=sh, -c, cat /proc/sys/kernel/random/boot_id
这个函数相当于查看 boot_id这个文件信息
捋顺下逻辑应该就是先fork进程 然后在子进程中读取这个文件 然后把他写入pip中
那么自定义syscallhandler后 再次运行成功拿到结果
全部代码如下：
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| 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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | package pdd; import com.github.unidbg.AndroidEmulator; import com.github.unidbg.Emulator; import com.github.unidbg.Module; import com.github.unidbg.file.FileResult; import com.github.unidbg.file.IOResolver; import com.github.unidbg.file.linux.AndroidFileIO; import com.github.unidbg.linux.android.AndroidARMEmulator; import com.github.unidbg.linux.android.AndroidEmulatorBuilder; import com.github.unidbg.linux.android.AndroidResolver; import com.github.unidbg.linux.android.dvm.*; import com.github.unidbg.linux.file.ByteArrayFileIO; import com.github.unidbg.memory.Memory; import com.github.unidbg.memory.SvcMemory; import com.github.unidbg.spi.SyscallHandler; import com.github.unidbg.unix.UnixSyscallHandler; import java.io.File; import java.nio.charset.StandardCharsets; import java.util.ArrayList; import java.util.List; import java.util.UUID; public class Pddmain ``extends AbstractJni ``implements IOResolver<AndroidFileIO> { ``private AndroidEmulator androidEmulator; ``private static final String APK_PATH = ``"/Users/Downloads/com.xunmeng.pinduoduo_6.7.0_60700.apk"``; ``private static final String SO_PATH = ``"/Users/Downloads/com.xunmeng.pinduoduo_6.7.0_60700/lib/armeabi-v7a/libpdd_secure.so"``; ``private Module moduleModule; ``private VM dalvikVM; ``public static void main(String[] args) { ``Pddmain main = ``new Pddmain(); ``main.create(); ``} ``private void create() { ``AndroidEmulatorBuilder androidEmulatorBuilder = ``new AndroidEmulatorBuilder(``false``) { ``@Override ``public AndroidEmulator build() { ``return new AndroidARMEmulator(``"com.xunmeng.pinduoduo"``,rootDir,backendFactories) { ``@Override ``protected UnixSyscallHandler<AndroidFileIO> createSyscallHandler(SvcMemory svcMemory) { ``return new PddArmSysCallHand(svcMemory); ``} ``}; ``} ``}; ``androidEmulator = androidEmulatorBuilder.setProcessName(``""``).build(); ``androidEmulator.getSyscallHandler().addIOResolver(``this``); ``Memory androidEmulatorMemory = androidEmulator.getMemory(); ``androidEmulatorMemory.setLibraryResolver(``new AndroidResolver(``23``)); ``dalvikVM = androidEmulator.createDalvikVM(``new File(APK_PATH)); ``DalvikModule module = dalvikVM.loadLibrary(``new File(SO_PATH), ``true``); ``moduleModule = module.getModule(); ``dalvikVM.setJni(``this``); ``dalvikVM.setVerbose(``true``); ``dalvikVM.callJNI_OnLoad(androidEmulator, moduleModule); ``callInfo3(); ``} ``@Override ``public void callStaticVoidMethodV(BaseVM vm, DvmClass dvmClass, String signature, VaList vaList) { ``if (``"com/tencent/mars/xlog/PLog->i(Ljava/lang/String;Ljava/lang/String;)V"``.equals(signature)) { ``return``; ``} ``super``.callStaticVoidMethodV(vm, dvmClass, signature, vaList); ``} ``private void callInfo3() { ``List<Object> argList = ``new ArrayList<>(); ``argList.add(dalvikVM.getJNIEnv()); ``argList.add(``0``); ``DvmObject<?> context = dalvikVM.resolveClass(``"android/content/Context"``).newObject(``null``); ``argList.add(dalvikVM.addLocalObject(context)); ``argList.add(dalvikVM.addLocalObject(``new StringObject(dalvikVM, ``"api/oak/integration/render"``))); ``argList.add(dalvikVM.addLocalObject(``new StringObject(dalvikVM, ``"dIrjGpkC"``))); ``Number number = moduleModule.callFunction(androidEmulator, ``0xb6f9``, argList.toArray())[``0``]; ``String toString = dalvikVM.getObject(number.intValue()).getValue().toString(); ``System.out.println(toString); ``} ``@Override ``public DvmObject<?> callStaticObjectMethodV(BaseVM vm, DvmClass dvmClass, String signature, VaList vaList) { ``if (``"com/xunmeng/pinduoduo/secure/EU->gad()Ljava/lang/String;"``.equals(signature)) { ``return new StringObject(vm, ``"cb14a9e76b72a627"``); ``} ``else if (``"java/util/UUID->randomUUID()Ljava/util/UUID;"``.equals(signature)) { ``UUID uuid = UUID.randomUUID(); ``DvmObject<?> dvmObject = vm.resolveClass(``"java/util/UUID"``).newObject(uuid); ``return dvmObject; ``} ``return super``.callStaticObjectMethodV(vm, dvmClass, signature, vaList); ``} ``@Override ``public DvmObject<?> callObjectMethodV(BaseVM vm, DvmObject<?> dvmObject, String signature, VaList vaList) { ``if (``"java/util/UUID->toString()Ljava/lang/String;"``.equals(signature)) { ``UUID uuid = (UUID) dvmObject.getValue(); ``return new StringObject(vm, uuid.toString()); ``} ``else if (``"java/lang/String->replaceAll(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;"``.equals(signature)) { ``String obj = dvmObject.getValue().toString(); ``String arg0 = vaList.getObjectArg(``0``).toString(); ``String arg1 = vaList.getObjectArg(``1``).toString(); ``String replaceAll = obj.replaceAll(arg0, arg1); ``return new StringObject(vm, replaceAll); ``} ``return super``.callObjectMethodV(vm, dvmObject, signature, vaList); ``} ``@Override ``public int callIntMethodV(BaseVM vm, DvmObject<?> dvmObject, String signature, VaList vaList) { ``if (``"java/lang/String->hashCode()I"``.equals(signature)) { ``return dvmObject.getValue().toString().hashCode(); ``} ``return super``.callIntMethodV(vm, dvmObject, signature, vaList); ``} ``@Override ``public FileResult<AndroidFileIO> resolve(Emulator<AndroidFileIO> emulator, String pathname, ``int oflags) { ``if (``"/proc/stat"``.equals(pathname)) { ``String info = ``"cpu 15884810 499865 12934024 24971554 59427 3231204 945931 0 0 0\n" + ``"cpu0 6702550 170428 5497985 19277857 45380 1821584 529454 0 0 0\n" + ``"cpu1 4438333 121907 3285784 1799772 3702 504395 255852 0 0 0\n" + ``"cpu2 2735453 133666 2450712 1812564 4626 538114 93763 0 0 0\n" + ``"cpu3 2008473 73862 1699542 2081360 5716 367109 66860 0 0 0\n" + ``"intr 1022419954 0 0 0 159719900 0 16265892 4846825 5 5 5 6 0 0 497 24817167 17 176595 1352 0 28375276 0 0 0 0 5239 698 0 0 0 0 0 0 3212852 0 12195284 0 0 0 0 0 43 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12513 2743129 375 12477726 0 0 0 0 37 1351794 0 36 8 0 0 0 0 0 0 5846 0 0 0 0 0 0 0 0 0 141 32 0 55 0 0 0 0 0 0 0 0 18 0 18 0 0 0 0 0 0 66 0 0 0 0 0 0 0 77 0 166 0 0 0 0 0 394 0 0 0 0 0 1339137 0 0 0 0 0 0 313 0 0 0 55759 7 7 7 0 0 0 0 0 0 0 0 3066136 0 47 0 0 0 2 2 0 0 0 6 8 0 0 0 2 0 462 2952327 35420 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 495589 0 0 0 0 3 27 0 0 0 0 0 0 0 0 0 0 0 0 0 0 37662 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4760 0 0 97 0 0 0 0 0 0 0 0 0 243 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4649 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22355451 0 0 0 14 0 24449357 96 49415 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17067 780222 3211 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 649346 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0\n" + ``"ctxt 1572087931\n" + ``"btime 1649910663\n" + ``"processes 230673\n" + ``"procs_running 6\n" + ``"procs_blocked 0\n" + ``"softirq 374327567 12481657 139161248 204829 7276312 2275183 26796 12851725 80988196 1422751 117638870"``; ``return FileResult.success(``new ByteArrayFileIO(oflags, pathname, info.getBytes(StandardCharsets.UTF_8))); ``} ``return null``; ``} } |