房天下登录接口JS逆向

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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：

pwd: 1ecd3a3921bd0a70e1114ebc0f00b0d1aa88c7b9948ba4d9da5eafe2c52bae3fd43172ee55b6532e921756a822520873bae8a5380b386ed532e1b11fedc82b217d6946970b713b962e2678acfd07bac04d933939279e6fb94712b9f169634bca25342d478ba778a1915cce225313cca4f8fc7dd3a5860c88110b7373c60ea097

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。
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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：

分析得到加密函数是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：
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部分关键完整代碼
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 execjs
import 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%3a%2f%2fmy.fang.com%2f','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():# 16521689404uid = 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()