「JS 逆向百例」房天下登录接口参数逆向（房天下端口怎么用）

声明

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逆向目标

• 目标：房天下账号密码登录

• 主页：https://passport.fang.com/

• 接口：https://passport.fang.com/login.api

• 逆向参数：

  Form Data：

  pwd: 044b527dba64d1e82657668beae1d61e4d86643d231792c78d5c538461a146b01c8e28d98b14915a11758deb6095aba16688a07427150434681949529f02e808e8891e1f90b5c91d42058a83f2c6902bd69825577dc4efb993f1aa4c9bb43a2bbe1acad5781a8738614ddafbda3cca99a0c03fb634d8e1001f25bca59a8d421b`

逆向过程

抓包分析

随便输入一个账号密码，点击登陆，抓包定位到登录接口为 https://passport.fang.com/login.api ，POST 请求，Form Data 里，密码 pwd 被加密处理了。

参数逆向

加密参数只有一个 pwd，直接全局搜索，出现一个 loginbypassword.js，很明显就是加密的 JS，这个 JS 贴心的写上了中文注释，直接来到登录模块，埋下断点：

uid: that.username.val(),pwd: encryptedString(key_to_encode, that.password.val()),Service: that.service.val(),AutoLogin: that.autoLogin.val()

encryptedString 这个函数可以看到在一个叫做 RSA.min.js 的加密 JS 里，很明显的 RSA 加密，直接 copy 下来就好了，key_to_encode 这个参数可以直接在首页搜到，可以看到是向 RSAKeyPair 函数传入参数得到的：

完整代码

以下只演示部分关键代码，完整代码可在 GitHub 下载：https://github.com/kuaidaili/crawler/tree/main/passport_fang_com

fang_encrypt.js

function setMaxDigits(n) {}function BigInt(n) {}function biFromDecimal(n) {}// 此处省略 N 个函数function twoDigit(n) {}function encryptedString(n, t) {}function decryptedString(n, t) {}var biRadixBase = 2, biRadixBits = 16, bitsPerDigit = biRadixBits, biRadix = 65536, biHalfRadix = biRadix >>> 1, biRadixSquared = biRadix * biRadix, maxDigitVal = biRadix - 1, maxInteger = 9999999999999998, maxDigits, ZERO_ARRAY, bigZero, bigOne, dpl10, lr10, hexatrigesimalToChar, hexToChar, highBitMasks, lowBitMasks;setMaxDigits(20);dpl10 = 15;lr10 = biFromNumber(1e15);hexatrigesimalToChar = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];hexToChar = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"];highBitMasks = [0, 32768, 49152, 57344, 61440, 63488, 64512, 65024, 65280, 65408, 65472, 65504, 65520, 65528, 65532, 65534, 65535];lowBitMasks = [0, 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535];setMaxDigits(129);function getEncryptedPassword(pwd, n, i, t) { var key_to_encode = new RSAKeyPair(n, i, t); return encryptedString(key_to_encode, pwd)}// 测试样例// console.log(getEncryptedPassword("16521689404", "010001", "", "978C0A92D2173439707498F0944AA476B1B62595877DD6FA87F6E2AC6DCB3D0BF0B82857439C99B5091192BC134889DFF60C562EC54EFBA4FF2F9D55ADBCCEA4A2FBA80CB398ED501280A007C83AF30C3D1A142D6133C63012B90AB26AC60C898FB66EDC3192C3EC4FF66925A64003B72496099F4F09A9FB72A2CF9E4D770C41"))

fang_login.py

#!/usr/bin/env python3# -*- coding: utf-8 -*-import reimport execjsimport requestsindex_url = 'https://passport.fang.com/'login_url = 'https://passport.fang.com/login.api'user_agent = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36'session = requests.session()def get_key_to_encode(): headers = {'User-Agent': user_agent} response = session.get(url=index_url, headers=headers) key_to_encode = re.findall(r'RSAKeyPair((.*));', response.text)[0].replace('"', '').split(', ') return key_to_encodedef get_encrypted_password(key_to_encode, pwd): n, i, t = key_to_encode[0], key_to_encode[1], key_to_encode[2] with open('fang_encrypt.js', 'r', encoding='utf-8') as f: fang_js = f.read() encrypted_pwd = execjs.compile(fang_js).call('getEncryptedPassword', pwd, n, i, t) return encrypted_pwddef login(encrypted_password, uid): headers = { 'User-Agent': user_agent, 'X-Requested-With': 'XMLHttpRequest', 'Host': 'passport.fang.com', 'Origin': 'https://passport.fang.com', 'Referer': 'https://passport.fang.com/?backurl=http://my.fang.com/', 'sec-ch-ua': '" Not;A Brand";v="99", "Google Chrome";v="91", "Chromium";v="91"', 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' } data = { 'uid': uid, 'pwd': encrypted_password, 'Service': 'soufun-passport-web', 'AutoLogin': 1 } response = session.post(url=login_url, data=data, headers=headers) print(response.json())def main(): # 16521689404 uid = input('请输入登录账号：') pwd = input('请输入登录密码：') rsa_key = get_key_to_encode() encrypted_pwd = get_encrypted_password(rsa_key, pwd) login(encrypted_pwd, uid)if __name__ == '__main__': main()