爬虫逆向实战(32)-某号店登录(RSA、补环境、混淆)

一、数据接口分析

主页地址：某号店

1、抓包

通过抓包可以发现登录接口是/publicPassport/login.do

2、判断是否有加密参数

1. 请求参数是否加密？
   通过查看“载荷”模块可以发现，有三个加密参数：username、password、captchaToken
   
2. 请求头是否加密？
   无
3. 响应是否加密？
   无
4. cookie是否加密？
   无

二、加密位置定位

1、看启动器

查看启动器发现里面调用堆栈中有一个double_submit，点进去查看

可以看出此处是发送ajax请求的位置，并且三个加密参数都是在此处赋值

在此处打上断点，发现可以断住，所以此处就是加密位置。

三、扣js代码

username、password是使用的标准RSA加密算法，所以我们可以不用扣，直接使用标准算法即可。但是captchaToken是使用window.jab.getData()生成的，进去这个方法后，可以发现是在一个混淆的文件中，所以我们需要将文件进行解混淆，解混淆之后再使用本地替换，将这个js文件替换为解混淆的。扣代码的时候，发现需要扣的代码还是挺多的，所以我们可以将整个文件全扣，然后补环境即可。
JavaScript源码：

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        };

        w["loadScript"] = function (B, C) {
          var E = h["getElementsByTagName"]("head")[0];
          var F = h["createElement"]("script");
          F["charset"] = "UTF-8";
          F["async"] = true;

          F["onerror"] = function () {
            C(true);
          };

          var G = false;

          F["onload"] = F["onreadystatechange"] = function () {
            if (!G && (!F["readyState"] || "loaded" === F["readyState"] || "complete" === F["readyState"])) {
              G = true;
              j(function () {
                C(false);
              }, 0);
            }
          };

          F["src"] = B;
          E["appendChild"](F);
        };

        return w;
      });
    }, {
      "6": 6
    }]
  }, {}, [5]);
}();

const JSEncrypt = require('jsencrypt');
var jab = new JAB({
        bizId: 'PASSPORT_LOGIN',
        initCaptcha: true})
var pubkey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDXQG8rnxhslm+2f7Epu3bB0inrnCaTHhUQCYE+2X+qWQgcpn+Hvwyks3A67mvkIcyvV0ED3HFDf+ANoMWV1Ex56dKqOmSUmjrk7s5cjQeiIsxX7Q3hSzO61/kLpKNH+NE6iAPpm96Fg15rCjbm+5rR96DhLNG7zt2JgOd2o1wXkQIDAQAB";


function get_param(username, password) {
    var k = username;
    var j = password;
    var i = new JSEncrypt();
    i.setPublicKey(pubkey);
    j = i.encrypt(j);
    k = i.encrypt(k);
    var h = {
        "credentials.username": k,
        "credentials.password": j,
        validCode: undefined,
        sig: "",
        is_jab: "true",
        captchaToken: jab.getData(),
        jab_st: 0,
        loginSource: "1",
        returnUrl: "http://www.yhd.com",
        isAutoLogin: "0",
        slideData: ""
    }
    return h
}