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[原创] 安卓协议逆向 mtxx 分析与实现
2023-1-10 14:36 8130

[原创] 安卓协议逆向 mtxx 分析与实现

行简 活跃值
2023-1-10 14:36
8130

Kit

app 版本：9.5.3.0
设备：K40 刷 piexl 11 rom
抓包工具：Charles
反汇编工具：JEB、JADX
inject：frida

抓包

GET /v2/search/feeds.json?client_timestamp=1671885699194&client_timezone=GMT%2B8&is_gdpr=0&client_channel_id=taobao&client_model=M2012K11AC&local_abtest=%5B%5D&cpuModel=qcom-SM8250&client_brand=Redmi&resolution=1080*2278&client_id=1089867602&sigVersion=1.3&runtimeMaxMemory=512&ad_sdk_version=5.10.20&feed_sort=normal&is_test=0&keyword=%E7%BE%8E%E7%94%B2&client_network=wifi&ram=7611&cpuVendor=%E9%AB%98%E9%80%9A&count=12&version=9.5.3.0&search_type=0&is_basic=0&country_code=CN&app_hot_start_times=1&attachFlag=409&client_session=36454fcbf949454cd2afa56c6d22a166&is64Bit=0&client_is_root=1&client_operator=&gid=2863613419&is_close_global_ad=0&client_language=zh_CN&cn_switch_on=0&sig=2c49ce7212100885736aa5e79ac70dd8&sigTime=1671885699194&client_os=11&lang=1&is_privacy=0&user_agent=mtxx-9530-Xiaomi-M2012K11AC-android-11-285d5ace&is_ohos=0&sigEnv=0&appAreaType=1&personality_not_recommend=0&community_version=2.0.0&android_sdk_int=30&ad_personality_not_recommend=0&is_device_support_64=1 HTTP/1.1
ab_info: {"ab_codes":[{"code":15619,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":19219,"count":0,"experiment_type":3,"status":1,"lr":0},{"code":16412,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":16928,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":19495,"count":0,"experiment_type":3,"status":1,"lr":0},{"code":19533,"count":4,"experiment_type":3,"status":1,"lr":1671885085070},{"code":10109,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":16805,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":12454,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":19133,"count":0,"experiment_type":3,"status":1,"lr":0},{"code":12230,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":17615,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":17623,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":13797,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":12009,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":13301,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":14838,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":15353,"count":0,"experiment_type":3,"status":5,"lr":0},{"code":14844,"count":0,"experiment_type":3,"status":5,"lr":0}],"last_access":1671885695251,"timeout":2047483000,"version":"5.6.1"}
User-Agent: mtxx-9530-Xiaomi-M2012K11AC-android-11-285d5ace
Host: api.xiuxiu.meitu.com
Connection: Keep-Alive
Accept-Encoding: gzip
traceIdHigh: 2863613419
traceIdLow: 1753099219224232333

 

一个个分析下来仅 sig、sigTime、client_session、client_timestamp 几个参数是会变动的，其余都应该是固定的

分析

拖入 jadx 先搜索 client_session 得到两个结果，非常好确认，定位到 com.meitu.meitupic.framework.util.g 类中：

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String k2 = k(currentTimeMillis);
if (!TextUtils.isEmpty(k2)) {
    concurrentHashMap.put("client_session", k2);
}

大致判断 client_session 应该就是个时间戳，跟进 k 方法中看看：

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private static String k(long j2) {
    com.meitu.library.appcia.trace.b.i(184462);
    if (!TextUtils.isEmpty(D) && D.length() >= 10) {
        int i2 = (int) (j2 % 10);
        StringBuilder sb = new StringBuilder(D.substring(0, 10));
        sb.replace(i2, i2 + 1, String.valueOf(i2));
        String a2 = com.meitu.library.util.a.a(sb.toString());
        com.meitu.library.appcia.trace.b.b(184462);
        return a2;
    }
    com.meitu.library.appcia.trace.b.b(184462);
    return "";
}

上 frida hook 直接看结果：

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function main() {
    Java.perform(function () {
        var client_session = Java.use("com.meitu.meitupic.framework.util.g");
        client_session.k.implementation = function (arg1) {
            console.log("++++++++++++++++++++++++++++++++++++++++")
            console.log("args1: " + arg1)
            var result = this.k(arg1);
            console.log("result: " + result)
            console.log("++++++++++++++++++++++++++++++++++++++++")
            return result;
        }
    });
}
setImmediate(main)

输入烧烤 hook 结果：

args1: 1671893086682
result: 8479b44135cab6f54bf0c0a0f0274daa

 

对照其抓包结果 client_session 值校验无误，其中 arg1 就是 client_timestamp 值，一下解决两。

 

继续分析 sig。
通过上面分析的 com.meitu.meitupic.framework.util.g 查找 sig 得到了相关引用位置，最终定位到 com.meitu.secret.SigEntity 下的 generatorSig 方法：

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public static SigEntity generatorSig(@NonNull String str, @NonNull String[] strArr, @NonNull String str2, @NonNull Object obj) {
 b.i(101093);
 if (!(obj instanceof Context)) {
  AndroidRuntimeException androidRuntimeException = new AndroidRuntimeException("req ctx");
  b.b(101093);
  throw androidRuntimeException;
 }
 byte[][] bArr = new byte[strArr.length];
 for (int i2 = 0; i2 < strArr.length; i2++) {
  if (strArr[i2] == null) {
   strArr[i2] = "";
  }
  bArr[i2] = strArr[i2].getBytes();
 }
 SigEntity buildSigEntity = buildSigEntity(ElfReader.b(str, bArr, str2, (Context) obj));
 b.b(101093);
 return buildSigEntity;
}

查看其参数：

参数一：String str, 参数二： String[] strArr, 参数三： String str2, 参数四： Object obj

 

看其上层调用：

SigEntity generatorSig = SigEntity.generatorSig(A2, (String[]) arrayList.toArray(new String[arrayList.size()]), com.meitu.meitupic.framework.common.c.a, BaseApplication.getApplication());

 

参数一、二为形参先放着，跟进参数三可得：

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public class c {
    public static String a;
    static {
        com.meitu.library.appcia.trace.b.i(183635);
        a = "6184556633574670337";
        com.meitu.library.appcia.trace.b.b(183635);
    }
}

可见参数三是一个固定值，再跟进看参数四：

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public static Application getApplication() {
    b.i(82595);
    Application application = mBaseApplication;
    b.b(82595);
    return application;
}

一个对象，返回的是 obj ，Java 中可通过对象的实例获取到对象的属性值，猜测其中藏有 sig 及 sigTime。

 

遇事不决，frida 最是直接：

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function main() {
    Java.perform(function () {
        var SigEntity = Java.use("com.meitu.secret.SigEntity");
        SigEntity.generatorSig.overload('java.lang.String', '[Ljava.lang.String;', 'java.lang.String', 'java.lang.Object').implementation =
        function (arg1, arg2, arg3, arg4) {
            console.log("++++++++++++++++++++++++++++++++++++++++")
            console.log("arg1: ", arg1)
            console.log("arg2: ", arg2)  
            console.log("arg3: ", arg3)
            console.log("arg4: ", arg4)
            var result = this.generatorSig(arg1, arg2, arg3, arg4);
            console.log("result_sig: ", result.sig.value);
            console.log("result_sigTime: ", result.sigTime.value);
            console.log("++++++++++++++++++++++++++++++++++++++++")
            return result;
        }
    });
}
setImmediate(main)

输入烧烤 hook 结果：

arg1: search/feeds.json
arg2: 1671898697836,,GMT+8,0,2863613419,taobao,M2012K11AC,[],qcom-SM8250,0,Redmi,1080*2278,zh_CN,1089867602,0,512,5.10.20,11,normal,0,烧烤,1,0,wifi,mtxx-9530-Xiaomi-M2012K11AC-android-11-285d5ace,7611,高通,12,0,0,1,0,9.5.3.0,0,0,2.0.0,CN,1,409,30,0,9b2dc941affe929a86ca97227211d55b,0,1,1
arg3: 6184556633574670337
arg4: com.meitu.remote.hotfix.app.RemoteHotfixApplication@2d01c1
result_sig: 4e3a4cecec59b439a636ba7c01154225
result_sigTime: 1671898697866

 

对照其抓包结果 sig、sigTime值校验无误，其中参数一为固定值：search/feeds.json，参数二为查找的内容加一些手机相关字段。

frida 主动调用

参数都解决了，剩下就是批量抓包了，构建 frida rpc 脚本：

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rpc.exports = {
    "sig": function (params) {
        var ret_dict = {};
        Java.perform(function () {
            var SigEntity = Java.use("com.meitu.secret.SigEntity");
            var arg1 = "search/feeds.json";
            var arg2 = params
            var arg3 = "6184556633574670337";
            var BaseApplication = Java.use('com.meitu.library.application.BaseApplication');
            var arg4 = BaseApplication.getApplication();
            var result = SigEntity.generatorSig(arg1, arg2, arg3, arg4);
            ret_dict["sig"] = result.sig.value;
            ret_dict["sigTime"] = result.sigTime.value;
            console.log("[*] sig:", result.sig.value);
            console.log("[*] sigTime:", result.sig.value);
        });
        return ret_dict;
    },
    "cnt": function (timestamp) {
        var ret_dict = null;
        Java.perform(function () {
            var client_session = Java.use("com.meitu.meitupic.framework.util.g");
            ret_dict = client_session.k(timestamp);
            console.log("ret_dict: ", ret_dict);
        });
        return ret_dict;
    }
}

上 py 调用 rpc 脚本：

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import frida
import time
import requests
 
def on_message(message, data):
    print("[%s] => %s" % (message, data))
 
def inject_hook():
    session = frida.get_usb_device().attach('com.mt.mtxx.mtxx')
    with open('meitu/mt_rpc.js', 'r') as f:
        js_code = f.read()
    script = session.create_script(js_code)
    script.on('message', on_message)
    script.load()
    return script
 
def get_sig():
    params = [timestamp,'','GMT+8','0','2863613419','taobao','M2012K11AC','[]','qcom-SM8250','0','Redmi',
            '1080*2278','zh_CN','1089867602','0','512','5.10.20','11','normal','0',key_word,'1','0','wifi',
            'mtxx-9530-Xiaomi-M2012K11AC-android-11-285d5ace','7611','高通','12','0','0','1','2','9.5.3.0',
            '0','0','2.0.0','CN','1','409','30','0',client_session,'0','1','1']
    result = rpc_script.exports.a(params)
    return result
 
def req():
    url = "https://api.xiuxiu.meitu.com/v2/search/feeds.json"
    params = {
        "client_timestamp": timestamp,
        "client_timezone": "GMT+8",
        "is_gdpr": "0",
        "client_channel_id": "taobao",
        "client_model": "M2012K11AC",
        "local_abtest": "[]",
        "cpuModel": "qcom-SM8250",
        "client_brand": "Redmi",
        "resolution": "1080*2278",
        "client_id": "1089867602",
        "sigVersion": "1.3",
        "runtimeMaxMemory": "512",
        "ad_sdk_version": "5.10.20",
        "feed_sort": "normal",
        "is_test": "0",
        "keyword": key_word,
        "client_network": "wifi",
        "ram": "7611",
        "cpuVendor": "高通",
        "count": "12",
        "version": "9.5.3.0",
        "search_type": "2",
        "is_basic": "0",
        "country_code": "CN",
        "app_hot_start_times": "1",
        "attachFlag": "409",
        "client_session": client_session,
        "is64Bit": "0",
        "client_is_root": "1",
        "client_operator": "",
        "gid": "2863613419",
        "is_close_global_ad": "0",
        "client_language": "zh_CN",
        "cn_switch_on": "0",
        "sig": sig['sig'],
        "sigTime": sig['sigTime'],
        "client_os": "11",
        "lang": "1",
        "is_privacy": "0",
        "user_agent": "mtxx-9530-Xiaomi-M2012K11AC-android-11-285d5ace",
        "is_ohos": "0",
        "sigEnv": "0",
        "appAreaType": "1",
        "personality_not_recommend": "0",
        "community_version": "2.0.0",
        "android_sdk_int": "30",
        "ad_personality_not_recommend": "0",
        "is_device_support_64": "1",
    }
    response = requests.get(url=url, params=params)
    print(response.text)
 
if __name__ == '__main__':
    rpc_script = inject_hook()
    key_word = "烧烤"
    now_time = round(time.time())
    timestamp = str(now_time)
    client_session = rpc_script.exports.b(now_time)
    print("client_session: {}".format(client_session))
    sig = get_sig()
    print(sig['sig'])
    req()

结果如下，完美实现：

ret_dict: ff5a6e7b2fbfc04d8bccde169c4f6436
client_session: ff5a6e7b2fbfc04d8bccde169c4f6436
[] sig: d8e113b90ef5b440f8de162f4db41470
[] sigTime: d8e113b90ef5b440f8de162f4db41470
d8e113b90ef5b440f8de162f4db41470
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文案：希望我可以成为你生活的一部分\n✨ 一件导入图片即可\n@MT小助手 @MT情报局 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[培训]二进制漏洞攻防（第3期）；满10人开班；模糊测试与工具使用二次开发；网络协议漏洞挖掘；Linux内核漏洞挖掘与利用；AOSP漏洞挖掘与利用；代码审计。

最后于 2023-1-11 11:14 被行简编辑 ，原因：
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