Yakit靶场-高级前端加解密与验签实战-全关卡通关教程
一、前端验签-SHA256本文作者为CVE-柠檬i
CSDN：https://blog.csdn.net/weixin_49125123
博客园：https://www.cnblogs.com/CVE-Lemon
微信公众号：Lemon安全
绕过
https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005130112-183765002.png
通过查看源代码可以看到key为
1234123412341234https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005133198-1662357300.png
通过查看源代码可以看到是通过SHA256来进行署名的，他把请求体的username和password字段提取，然后进行加密。
username=admin&password=admin123https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005136827-1401035207.png
使用CyberChef加密，最终得到加密值为：fc4b936199576dd7671db23b71100b739026ca9dcb3ae78660c4ba3445d0654d
https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005139852-723382500.png
可以看到自己计算和前端计算的一致：
https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005143563-741888526.png
修改暗码，重新构造署名：
username=admin&password=666666
=>
26976ad249c29595c3e9e368d9c3bc772b5a27291515caddd023d69421b7ffeehttps://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005148499-2079865334.png
发送请求，可以看到验签乐成，暗码正确登岸乐成，自此署名绕过乐成。
POST /crypto/sign/hmac/sha256/verify HTTP/1.1
Host: 127.0.0.1:8787
Content-Type: application/json
{
"signature": "26976ad249c29595c3e9e368d9c3bc772b5a27291515caddd023d69421b7ffee",
"key": "31323334313233343132333431323334",
"username": "admin",
"password": "666666"
}https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005152327-1303090435.png
热加载
这是我写的热加载代码，通过beforeRequest劫持请求包，使用encryptData函数进行加密，最终实现热加载自动署名功能。
encryptData = (packet) => { body = poc.GetHTTPPacketBody(packet) params = json.loads(body) //获取账号和暗码 name = params.username pass= params.password key = "31323334313233343132333431323334" //十六进制密钥 //HmacSha256加密 signText = f`username=${name}&password=${pass}` sign = codec.EncodeToHex(codec.HmacSha256(f`${codec.DecodeHex(key)~}`, signText)) //构造请求体 result = f`{"username":"${name}","password":"${pass}","signature":"${sign}","key":"${key}"}` return string(poc.ReplaceBody(packet, result, false))}//发送到服务端修改数据包// beforeRequest = func(req){// return encryptData(req)// }//调试用packet =
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