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12306 抢票系列之只要搞定RAIL_DEVICEID的来源,从此抢票不再掉线(下)

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算法爬虫源码

模拟伪装

现在已经还原了算法的实现逻辑,下一步就是如何更好地伪造自己,本文提供临时设置的实现方式,方便在不修改之前复现代码的基础上实现扩展,当然也可以直接在还原算法源码中写入伪造代码.

值得注意的是,这种 Object.defineProperty 方式只会临时生效而且仅仅针对使用 js 代码获取对象属性的值,并不会真正修改对象属性!

设置用户代理

  /**
   * 设置用户代理,检测方式: navigator.userAgent
   */
  chromeHelper.setUserAgent = function(userAgent) {
    if (!userAgent) {
      userAgent = "Mozilla5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit537.36 (KHTML, like Gecko) Chrome80.0.3987.87 Safari537.36";
    }
    Object.defineProperty(navigator, "userAgent", {
      value: userAgent,
      writable: false
    });
  }

设置浏览器语言

  /**
   * 设置浏览器语言,检测方式: navigator.language
   */
  chromeHelper.setLanguage = function(language) {
    if (!language) {
      language = "zh-CN";
    }
    Object.defineProperty(navigator, "language", {
      value: language,
      writable: false
    });
  }

设置浏览器语言

  /**
   * 设置浏览器语言,检测方式: navigator.languages
   */
  chromeHelper.setLanguages = function(languages) {
    if (!languages) {
      languages = ["zh-CN", "zh", "en"];
    }
    Object.defineProperty(navigator, "languages", {
      value: languages,
      writable: false
    });
  }

设置屏幕颜色深度

  /**
   * 设置屏幕颜色深度,检测方式: screen.colorDepth
   */
  chromeHelper.setColorDepth = function(colorDepth) {
    if (!colorDepth) {
      colorDepth = 24;
    }
    Object.defineProperty(screen, "colorDepth", {
      value: colorDepth,
      writable: false
    });
  }

设置设备像素比率

  /**
   * 设置设备像素比率,检测方式: window.devicePixelRatio
   */
  chromeHelper.setDevicePixelRatio = function(devicePixelRatio) {
    if (!devicePixelRatio) {
      devicePixelRatio = 24;
    }
    Object.defineProperty(window, "devicePixelRatio", {
      value: devicePixelRatio,
      writable: false
    });
  }

设置屏幕宽度

  /**
   * 设置屏幕宽度,检测方式: screen.width
   */
  chromeHelper.setWidth = function(width) {
    if (!width) {
      width = 1280;
    }
    Object.defineProperty(screen, "width", {
      value: width,
      writable: false
    });
  }

设置屏幕高度

  /**
   * 设置屏幕高度,检测方式: screen.height
   */
  chromeHelper.setHeight = function(height) {
    if (!height) {
      height = 800;
    }
    Object.defineProperty(screen, "height", {
      value: height,
      writable: false
    });
  }

设置屏幕可用宽度

  /**
   * 设置屏幕可用宽度,检测方式: screen.availWidth
   */
  chromeHelper.setAvailWidth = function(availWidth) {
    if (!availWidth) {
      availWidth = 1280;
    }
    Object.defineProperty(screen, "availWidth", {
      value: availWidth,
      writable: false
    });
  }

设置屏幕可用高度

  /**
   * 设置屏幕可用高度,检测方式: screen.availHeight
   */
  chromeHelper.setAvailHeight = function(availHeight) {
    if (!availHeight) {
      availHeight = 777;
    }
    Object.defineProperty(screen, "availHeight", {
      value: availHeight,
      writable: false
    });
  }

设置Session存储

  /**
   * 设置Session存储,检测方式: !!window.sessionStorage
   */
  chromeHelper.setSessionStorage = function(sessionStorage) {
    if (!sessionStorage) {
      sessionStorage = 1;
    }
    if (sessionStorage) {
      window.sessionStorage = 1
    } else {
      delete window.sessionStorage
    }
  }

设置Local存储

  /**
   * 设置Local存储,检测方式: !!window.localStorage
   */
  chromeHelper.setLocalStorage = function(localStorage) {
    if (!localStorage) {
      localStorage = 1;
    }
    if (localStorage) {
      window.localStorage = 1
    } else {
      delete window.localStorage
    }
  }

设置indexedDB存储

  /**
   * 设置indexedDB存储,检测方式: !!window.indexedDB
   */
  chromeHelper.setIndexedDB = function(indexedDB) {
    if (!indexedDB) {
      indexedDB = 1;
    }
    if (indexedDB) {
      window.indexedDB = 1
    } else {
      delete window.indexedDB
    }
  }

设置addBehavior存储

  /**
   * 设置addBehavior存储,检测方式: !!document.body.addBehavior
   */
  chromeHelper.setAddBehavior = function(addBehavior) {
    if (!addBehavior) {
      addBehavior = 1;
    }
    if (addBehavior) {
      document.body.addBehavior = 1
    } else {
      delete document.body.addBehavior
    }
  }

设置Cpu类型

  /**
   * 设置Cpu类型,检测方式: navigator.cpuClass
   */
  chromeHelper.setCpuClass = function(cpuClass) {
    if (!cpuClass) {
      cpuClass = "unknown";
    }
    Object.defineProperty(navigator, "cpuClass", {
      value: cpuClass,
      writable: false
    });
  }

设置平台类型

  /**
   * 设置平台类型,检测方式: navigator.platform
   */
  chromeHelper.setPlatform = function(platform) {
    if (!platform) {
      platform = "MacIntel";
    }
    Object.defineProperty(navigator, "platform", {
      value: platform,
      writable: false
    });
  }

设置反追踪

  /**
   * 设置反追踪,检测方式: navigator.doNotTrack
   */
  chromeHelper.setDoNotTrack = function(doNotTrack) {
    if (!doNotTrack) {
      doNotTrack = "unknown";
    }
    Object.defineProperty(navigator, "doNotTrack", {
      value: doNotTrack,
      writable: false
    });
  }

设置插件

  /**
   * 设置插件,检测方式: navigator.plugins
   */
  chromeHelper.setPlugins = function(plugins) {

  }

设置Canvas

  /**
   * 设置Canvas,检测方式: TODO
   */
  chromeHelper.setCanvas = function(canvas) {

  }

设置Webgl

  /**
   * 设置Webgl,检测方式: TODO
   */
  chromeHelper.setWebgl = function(webgl) {

  }

设置AdBlock

  /**
   * 设置AdBlock,检测方式: TODO
   */
  chromeHelper.setAdBlock = function(AdBlock) {

  }

设置AdBlock

  /**
   * 设置AdBlock,检测方式: TODO
   */
  chromeHelper.setAdBlock = function(AdBlock) {

  }

设置字体

  /**
   * 设置字体,检测方式: TODO
   */
  chromeHelper.setFonts = function(fonts) {

  }

设置最多触控点

  /**
   * 设置最多触控点,检测方式: navigator.maxTouchPoints
   */
  chromeHelper.setMaxTouchPoints = function(maxTouchPoints) {
    if (!maxTouchPoints) {
      maxTouchPoints = 0;
    }
    Object.defineProperty(navigator, "maxTouchPoints", {
      value: maxTouchPoints,
      writable: false
    });
  }

设置ontouchstart事件

  /**
   * 设置ontouchstart事件,检测方式: "ontouchstart" in window
   */
  chromeHelper.setTouchEvent = function(ontouchstart) {
    if (!ontouchstart) {
      ontouchstart = false;
    }
    if (ontouchstart) {
      window.ontouchstart = true
    } else {
      delete window.ontouchstart
    }
  }

设置app代码名称代码

  /**
   * 设置app代码名称代码,检测方式: navigator.appCodeName.toString()
   */
  chromeHelper.setAppCodeName = function(appCodeName) {
    if (!appCodeName) {
      appCodeName = "Mozilla";
    }
    Object.defineProperty(navigator, "appCodeName", {
      value: appCodeName,
      writable: false
    });
  }

设置app代码名称代码

  /**
   * 设置app代码名称代码,检测方式: navigator.appName.toString()
   */
  chromeHelper.setAppName = function(appName) {
    if (!appName) {
      appName = "Netscape";
    }
    Object.defineProperty(navigator, "appName", {
      value: appName,
      writable: false
    });
  }

设置Java是否启用

  /**
   * 设置Java是否启用,检测方式: navigator.javaEnabled()
   */
  chromeHelper.setJavaEnabled = function(javaEnabled) {

  }

设置媒体类型

  /**
   * 设置媒体类型,检测方式: navigator.mimeTypes
   */
  chromeHelper.setMimeTypes = function(mimeTypes) {

  }

设置cookie是否启用

  /**
   * 设置cookie是否启用,检测方式: navigator.cookieEnabled
   */
  chromeHelper.setCookieEnabled = function(cookieEnabled) {
    if (!cookieEnabled) {
      cookieEnabled = true;
    }
    Object.defineProperty(navigator, "cookieEnabled", {
      value: cookieEnabled,
      writable: false
    });
  }

设置是否在线

  /**
   * 设置是否在线,检测方式: navigator.onLine.toString()
   */
  chromeHelper.setOnLine = function(onLine) {
    if (!onLine) {
      onLine = true;
    }
    Object.defineProperty(navigator, "onLine", {
      value: onLine,
      writable: false
    });
  }

添加历史记录

  /**
   * 添加历史记录,检测方式: window.history
   */
  chromeHelper.pushHistory = function(newUrls) {
    for (url in newUrls) {
      history.pushState(null, '', url);
    }
  }

使用示例

亲测构造请求 /otn/HttpZF/logdevice时,关于参数 algID 经常性发生变化,因此无法提供静态的请求方法,建议根据实际情况实时改变.

通过翻阅源码实现,最终发现关于发送请求的代码是这样的:

e = c.hashAlg(m, a, e);
a = e.key;
e = e.value;
a += "\x26timestamp\x3d" + (new Date).getTime();
$a.getJSON("https://kyfw.12306.cn/otn/HttpZF/logdevice" + ("?algID\x3dmBxuYhGXYR\x26hashCode\x3d" + e + a), null, function(a) {
    var b = JSON.parse(a);
    void 0 != mb && mb.postMessage(a, r.parent);
    for (var d in b)
        "dfp" == d ? G("RAIL_DEVICEID") != b[d] && (V("RAIL_DEVICEID", b[d], 1E3),
        c.deviceEc.set("RAIL_DEVICEID", b[d])) : "exp" == d ? V("RAIL_EXPIRATION", b[d], 1E3) : "cookieCode" == d && (c.ec.set("RAIL_OkLJUJ", b[d]),
        V("RAIL_OkLJUJ", "", 0))
})

其中,参数 a 表示的是加密后的浏览器指纹信息,(new Date).getTime() 是当前时间戳,而 algID\x3dmBxuYhGXYR\x26hashCode\x3d 这部分的 algID 算法参数是暂时性静态的,比如今天一段时间都是 mBxuYhGXYR 而第二天这个值就变成其他值了.

hashCode 参数的值就是程序运行结果的 value 值,最后面的变量 a 代表的是剩下的浏览器指纹信息,即运行结果的 key.

假设此时此刻为例,演示如何使用该 js 文件:

function ajax(req){
    var xhr=new XMLHttpRequest();
    xhr.onreadystatechange=function(){
        if(xhr.readyState===4){
            req.success&&req.success(xhr.responseText,xhr.status);
        }
    }
    req.method=req.method?req.method.toUpperCase():'GET';
    var data=null;
    var url=req.url;
    if(req.data){
        var arg='';
        for(var n in req.data){
            arg+=n+'='+encodeURIComponent(req.data[n])+'&'
        }
        arg=arg.slice(0,-1);
        if(req.method==='GET'){
            url=url+'?'+arg;
        }else{
            data=arg;
        }
    }
    if(req.headers){
        for(var h in req.headers){
            var v=req.headers[h];
            xhr.setRequestHeader(h,v);
        }
    }
    xhr.open(req.method,url);
    xhr.send(data);
}

e = chromeHelper.prototype.encryptedFingerPrintInfo();
a = e.key;
e = e.value;
a += "\x26timestamp\x3d" + (new Date).getTime();
ajax({
    url:"https://kyfw.12306.cn/otn/HttpZF/logdevice" + ("?algID\x3dmBxuYhGXYR\x26hashCode\x3d" + e + a),
    success:function(data){
        console.log("data",data);

        startIndex = "callbackFunction('".length;
        endIndex = data.lastIndexOf("')");
        jsonStrData = data.substring(startIndex,endIndex);
        console.log("jsonStrData",jsonStrData);

        jsonData = JSON.parse(jsonStrData);
        console.log("jsonData",jsonData);

        exp = jsonData.exp;
        cookieCode = jsonData.cookieCode;
        dfp = jsonData.dfp;
        console.log("RAIL_DEVICEID::: "+dfp+" RAIL_EXPIRATION::: " + exp +" RAIL_OkLJUJ::: " + cookieCode);
    }
});