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逆向目标
目标：房天下账号密码登录
-
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：
01.png
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：
02.png
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 re
import execjs
import requests
index_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_encode
def 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_pwd
def 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():
# 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()
