分析 CloudFlare JS加密的原理 (VB.net)

本内容在 https://blog.csdn.net/qq_39802740/article/details/101367856 上拓展，阅读本文需要先看懂该的文章。

本文核心内容：如何获得 jschl-answer 的值？

html文件见最后

当一个网站被cloudflare保护的时候，如 https://www.biovision.com/
向该网站发送http Get 请求，会返回503错误，但是仍然会返回一段html ，该html获取方式在用 vb.net 写则如下所示：

Dim result As New Dictionary(Of String, String)
Dim Request As HttpWebRequest = CType(Net.WebRequest.Create(URL), HttpWebRequest)
Dim Response As HttpWebResponse
With Request
    .Accept = "*/*"
    .Timeout = 6000
    .Method = "GET"
    .KeepAlive = False
    .Referer = URL
    .UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36"
    .ReadWriteTimeout = 3000
End With
Try
    Response = CType(Request.GetResponse(), HttpWebResponse)
    Dim Cookie = Response.Headers.ToString
Catch ex As WebException
    Try
        Dim whc As WebHeaderCollection = ex.Response.Headers
        Dim CFRAY As String = whc.Get("CF-RAY")
        Dim cfrequestid As String = whc.Get("cf-request-id")
        Dim SetCookie As String = whc.Get("Set-Cookie")
        result.Add("CF-RAY", CFRAY)
        result.Add("cf-request-id", cfrequestid)
        result.Add("Set-Cookie", SetCookie)
    Catch ex1 As Exception
        Console.WriteLine("未获得cfuid")
    End Try
End Try

获得的html 文本包含一段 js 代码如下：

<script type="text/javascript">
//
(function(){
		//省略
   setTimeout(function(){ 
	//省略
},4000); /*eoc*/
})();
  //]]>
</script>

其中，setTimeout 中的函数是我们需要关注的，其它的不用考虑
逐个分析代码中的片段：

  var s,t,o,p, b,r,e,a,k,i,n,g,f, 
  hTPbLCV={"YcDlEwUCMy":+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]))/+((!+[]+!![]+[])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]))};
//这里只有hTPbLCV赋值了

javascript 所有的 [] !![] 等算出来的值基本都是小数
hTPbLCV.YcDlEwUCMy=3.163119573749737
将代码放到浏览器执行如图所示（把你要计算的放到浏览器-console-里就能直接计算）：

下面这段代码用于解密特定的字符串：

g = String.fromCharCode;//根据 Unicode 值显示字符串 ，比如g(66)="B"
o = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
e = function(s) {
  s += "==".slice(2 - (s.length & 3));
  var bm, r = "", r1, r2, i = 0, r3 = '1020';
  for (; i < s.length;) {
      bm = o.indexOf(s.charAt(i++)) << 18 | o.indexOf(s.charAt(i++)) << 12
              | (r1 = o.indexOf(s.charAt(i++))) << 6 | (r2 = o.indexOf(s.charAt(i++)));
      r += r1 === 64 ? g(bm >> 16 & 255)
              : r2 === 64 ? g(bm >> 16 & 255, bm >> 8 & 255)
              : g(bm >> 16 & 255, bm >> 8 & 255, bm & 255);
  }
  return r;
};

比如：比如 e(‘ZG9jdW1l’)=“docume” 配合eval() 使用可以隐藏很多内容

下面这段用于获取网站的根域名

t = document.createElement('div');
t.innerHTML="x";		//href='/' 表示返回根目录，或者返回网站首页，这里是获取网站的首页
t = t.firstChild.href;
r = t.match(/https?:\/\//)[0];
t = t.substr(r.length); 
t = t.substr(0,t.length-1); //t的值就是当前网站的域名：如www.baidu.com，t的值与r无关

我们可以修改上面这段代码为：

t = "www.biovision.com";

接下来：

k = 'cf-dn-XjjFzigowDa';	//k是某个标签的id，见html文档中的  

a = document.getElementById('jschl+answer'.replace('+', '-'));	//jschl-answer
f = document.getElementById('challenge-form');//这里是为了提交表单，实际上就是发送Post请求

这里我们只需要 jschl-answer 计算出来的值，因此上面代码可以直接去掉 a,f 这两行：

k = 'cf-dn-XjjFzigowDa';

接下来，会不断改变 hTPbLCV.YcDlEwUCMy 的数值，这里就介绍两个特殊的计算过程：

过程1

hTPbLCV.YcDlEwUCMy-=function(p){var p = eval(eval(e("ZG9jdW1l")+(undefined+"")[1]+(true+"")[0]+(+(+!+[]+[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+[!+[]+!+[]]+[+[]])+[])[+!+[]]+g(103)+(true+"")[3]+(true+"")[0]+"Element"+g(66)+(NaN+[Infinity])[10]+"Id("+g(107)+")."+e("aW5uZXJIVE1M"))); return +(p)}();
//eval() 可计算某个字符串，并执行其中的的 JavaScript 代码
//eval("document.getElementById(k).innerHTML")) 获得的值见 

//再加一个eval() 表示计算该 innerHTML 的值 ，计算结果为5.595866831086827

可以发现有2个eval，先把第二个eval的内容放到浏览器执行（注意g,o,e都要复制）：

可以发现执行的结果是 “document.getElementById(k).innerHTML” ,这就表示 js从浏览器中获得了某些内容，也就是：

<div style="display:none;visibility:hidden;" 
id="cf-dn-XjjFzigowDa">
+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]+!![])+(+!![])+(+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+!![]))/+((+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]))
</div>

再加一个eval() 表示计算该 innerHTML 的值 ，计算结果为5.595866831086827
也就是说过程一的计算结果就是 5.595866831086827

过程2

hTPbLCV.YcDlEwUCMy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
+(function(p){return eval((true+"")[0]+".ch"+(false+"")[1]+(true+"")[1]+Function("return escape")()(("")["italics"]())[2]+"o"+(undefined+"")[2]+(true+"")[3]+"A"+(true+"")[0]+"("+p+")")}(+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+[])))));
//charCodeAt() 方法可返回指定位置的字符的 Unicode 编码

可以发现，这个根过程1 类似，同样，先把eval 里的值放到浏览器去执行：

可以看到，他是对 t 进行操作了，而 t=“www.biovision.com”
这里说一下， 这个 object htmllielement 就是 function§ 中 p 的值，该值传入的参数为 7，想知道为什么，可以去搜 js 匿名函数

同样的，过程2 的执行结果为 4.424814853139403

剩下的一大堆的 hTPbLCV.YcDlEwUCMy 计算过程就不讨论了，都是简单的 加减乘除，接下来看最后的语句：

a.value = (+hTPbLCV.YcDlEwUCMy).toFixed(10); '; 121'
//这里 '; 121' 可以删掉
//toFixed 就是保留几位小数
//最后计算得出的 jschl-answer 就是这个a.value的值
f.action += location.hash;	//location.hash 表示获得网站的锚链接，读取该值可以判断网站是否改变
f.submit();	//发送post请求，得到真实的网站

这里可以 直接改为：

jschlanswer= (+hTPbLCV.YcDlEwUCMy).toFixed(10); '; 121'
return jschlanswer
//写一个 函数 返回该值，就可以获得jschl-answer的正确数值了

得到 jschl-answer 写入cookie，就可以直接post 请求，从而绕过 5s 盾

附件

<html lang="en-US">
<head>
  <meta charset="UTF-8" />
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />
  <meta name="robots" content="noindex, nofollow" />
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
  <meta http-equiv="refresh" content="12">
  <title>Just a moment...title>
  <style type="text/css">
    html, body {width: 100%; height: 100%; margin: 0; padding: 0;}
    body {background-color: #ffffff; color: #000000; font-family:-apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, "Helvetica Neue",Arial, sans-serif; font-size: 16px; line-height: 1.7em;-webkit-font-smoothing: antialiased;}
    h1 { text-align: center; font-weight:700; margin: 16px 0; font-size: 32px; color:#000000; line-height: 1.25;}
    p {font-size: 20px; font-weight: 400; margin: 8px 0;}
    p, .attribution, {text-align: center;}
    #spinner {margin: 0 auto 30px auto; display: block;}
    .attribution {margin-top: 32px;}
    @keyframes fader     { 0% {opacity: 0.2;} 50% {opacity: 1.0;} 100% {opacity: 0.2;} }
    @-webkit-keyframes fader { 0% {opacity: 0.2;} 50% {opacity: 1.0;} 100% {opacity: 0.2;} }
    #cf-bubbles > .bubbles { animation: fader 1.6s infinite;}
    #cf-bubbles > .bubbles:nth-child(2) { animation-delay: .2s;}
    #cf-bubbles > .bubbles:nth-child(3) { animation-delay: .4s;}
    .bubbles { background-color: #f58220; width:20px; height: 20px; margin:2px; border-radius:100%; display:inline-block; }
    a { color: #2c7cb0; text-decoration: none; -moz-transition: color 0.15s ease; -o-transition: color 0.15s ease; -webkit-transition: color 0.15s ease; transition: color 0.15s ease; }
    a:hover{color: #f4a15d}
    .attribution{font-size: 16px; line-height: 1.5;}
    .ray_id{display: block; margin-top: 8px;}
  style>

    <script type="text/javascript">
  //
  (function(){
    
    var a = function() {try{return !!window.addEventListener} catch(e) {return !1} },
    b = function(b, c) {a() ? document.addEventListener("DOMContentLoaded", b, c) : document.attachEvent("onreadystatechange", b)};
    b(function(){
      var a = document.getElementById('cf-content');a.style.display = 'block';
      var isIE = /(MSIE|Trident\/|Edge\/)/i.test(window.navigator.userAgent);
      var trkjs = isIE ? new Image() : document.createElement('img');
      trkjs.setAttribute("src", "/cdn-cgi/images/trace/jschal/js/transparent.gif?ray=58949cb1d9ee04c0");
      trkjs.id = "trk_jschal_js";
      trkjs.setAttribute("alt", "");
      document.body.appendChild(trkjs);
      
      setTimeout(function(){
        var s,t,o,p, b,r,e,a,k,i,n,g,f, hTPbLCV={"YcDlEwUCMy":+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]))/+((!+[]+!![]+[])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]))};
        g = String.fromCharCode;
        o = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
        e = function(s) {
          s += "==".slice(2 - (s.length & 3));
          var bm, r = "", r1, r2, i = 0, r3 = '1020';
          for (; i < s.length;) {
              bm = o.indexOf(s.charAt(i++)) << 18 | o.indexOf(s.charAt(i++)) << 12
                      | (r1 = o.indexOf(s.charAt(i++))) << 6 | (r2 = o.indexOf(s.charAt(i++)));
              r += r1 === 64 ? g(bm >> 16 & 255)
                      : r2 === 64 ? g(bm >> 16 & 255, bm >> 8 & 255)
                      : g(bm >> 16 & 255, bm >> 8 & 255, bm & 255);
          }
          return r;
        };
        t = document.createElement('div');
        t.innerHTML="x";
        t = t.firstChild.href;r = t.match(/https?:\/\//)[0];
        t = t.substr(r.length); t = t.substr(0,t.length-1); k = 'cf-dn-XjjFzigowDa';
        a = document.getElementById('jschl+answer'.replace('+', '-'));
        f = document.getElementById('challenge-form');
        ;hTPbLCV.YcDlEwUCMy+=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]))/+((!+[]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(!+[]+!![])+(+!![])+(+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]));hTPbLCV.YcDlEwUCMy*=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(+[])+(+[])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]))/+((+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![]+!![])+(+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]));hTPbLCV.YcDlEwUCMy-=+((!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![])+(+[])+(!+[]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![]+!![]+!![])+(!+[]+!![]+!![]))/+((!+[]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![]+!![]+!![]+!![]+!![])+(!+[]+!![])+(!+[]+!![])+(+!![])+(+[])+(!+[]+!![]));hTPbLCV.YcDlEwUCMy-=function(p){var p = eval(eval(e("ZG9jdW1l")+(undefined+"")[1]+(true+"")[0]+(+(+!+[]+[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+[!+[]+!+[]]+[+[]])+[])[+!+[]]+g(103)+(true+"")[3]+(true+"")[0]+"Element"+g(66)+(NaN+[Infinity])[10]+"Id("+g(107)+")."+e("aW5uZXJIVE1M"))); return 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