• 极验验证码破解与研究


    声明

    原创文章,请勿转载!

    本文内容仅限于安全研究,不公开具体源码。维护网络安全,人人有责。

    本文配合其他文章一起服用效果更好,能更全面体会安全产品的设计。
    (1)《第三代验证码研究》https://www.cnblogs.com/boycelee/p/11363611.html(推荐)

    (2)《顶象验证码破解与研究》https://www.cnblogs.com/boycelee/p/14269941.html(推荐)

    (3)《极验验证码破解与研究》https://www.cnblogs.com/boycelee/p/14021048.html(推荐)

    (4)《极验无感验证破解》https://www.cnblogs.com/boycelee/p/13951819.html

    (5)《同盾小程序指纹破解》https://www.cnblogs.com/boycelee/category/1819211.html

    本文主要通过破解协议的方式绕过极验安全验证,思路与网上自动化的方式有很大的不同




    一、完整流程

    1、极验官网完整流程

    极验完整流程

    一、实例研究

    我们以春秋航空注册场景的验证码为研究对象

    1、实例研究地址

    https://account.ch.com/NonRegistrations-Regist

    2、实例研究场景

    春秋注册验证码

    二、请求分析

    1、网络请求抓包

    极验请求抓包

    从网络抓包结果可以看到,整个极验验证码与极验服务器一共交互了8次。要想破解极验验证码,首先我们就需要搞清楚每次请求都携带了哪些参数,其次就是参数如何生成的?只有搞明白每个参数的意义,后续我们才能够通过伪造参数以达到破解的目的。

    2、数据说明

    在分析极验请求前,需要先解释说明两个参数。

    (1)gt:极验为每个使用方提供一个唯一身份标识用于进行服务区分

    (2)challenge:用于请求串联,我们都知道http是无状态的,有了challenge就能把各个请求串联起来。(注意:challenge是会发生改变的,记得及时更换)

    3、请求分析

    请求1:gt.js

    (1)请求介绍

    关于第一个请求,在极验的官方文档已经给我们介绍了(https://docs.geetest.com/sensebot/deploy/client/web)。gt.js文件用于加载对应的验证JS库。

    (2)关键代码

    Config.prototype = {
        api_server: 'api.geetest.com',
        protocol: 'http://',
        typePath: '/gettype.php',
        fallback_config: {
            slide: {
                static_servers: ["static.geetest.com", "dn-staticdown.qbox.me"],
                type: 'slide',
                slide: '/static/js/geetest.0.0.0.js'
            },
            fullpage: {
                static_servers: ["static.geetest.com", "dn-staticdown.qbox.me"],
                type: 'fullpage',
                fullpage: '/static/js/fullpage.0.0.0.js'
            }
        },
        _get_fallback_config: function () {
            var self = this;
            if (isString(self.type)) {
                return self.fallback_config[self.type];
            } else if (self.new_captcha) {
                return self.fallback_config.fullpage;
            } else {
                return self.fallback_config.slide;
            }
        },
        _extend: function (obj) {
            var self = this;
            new _Object(obj)._each(function (key, value) {
                self[key] = value;
            })
        }
    };
    

    解释说明

    (1)正常请求会发送gettype.php请求

    # Request URL
    https://api.geetest.com/gettype.php?gt=25ba81caec944f8d74c98befd841a667&callback=geetest_1605974702024
    
    # Query String Parammeters
    gt: 25ba81caec944f8d74c98befd841a667
    callback: geetest_1605974702024
    

    (2)兜底策略

    如果发生异常情况,极验服务器无法响应。这时就会发送http://static.geetest.com/static/js/geetest.0.0.0.js获取能够在本地验证的js文件,确保应用服务正常运行。具体可以参考我的另一篇博客《极验无感验证破解》https://www.cnblogs.com/boycelee/p/13951819.html

    请求2:gettype.js

    (1)请求介绍

    该请求的目的是获取极验安全的核心js文件/static/js/fullpage.9.0.2.js和极验提供的各类型验证码对应的js文件。

    (2)请求详情

    # Request URL
    https://api.geetest.com/gettype.php?gt=25ba81caec944f8d74c98befd841a667&callback=geetest_1605974702024
    
    # Query String Parammeters
    gt: 25ba81caec944f8d74c98befd841a667
    callback: geetest_1605974702024
    
    # Response
    geetest_1605974702024({status: "success",…})
    data: {type: "fullpage", voice: "/static/js/voice.1.2.0.js", maze: "/static/js/maze.1.0.1.js",…}
    aspect_radio: {slide: 103, voice: 128, click: 128, pencil: 128, beeline: 50}
    beeline: "/static/js/beeline.1.0.1.js"
    click: "/static/js/click.2.9.4.js"
    fullpage: "/static/js/fullpage.9.0.2.js"
    geetest: "/static/js/geetest.6.0.9.js"
    maze: "/static/js/maze.1.0.1.js"
    pencil: "/static/js/pencil.1.0.3.js"
    slide: "/static/js/slide.7.7.5.js"
    static_servers: ["static.geetest.com/", "dn-staticdown.qbox.me/"]
    type: "fullpage"
    voice: "/static/js/voice.1.2.0.js"
    status: "success"
    

    请求3:fullpage.js

    请求介绍

    该js文件就是极验验证码的核心文件,其主要功能是指纹数据、环境检测数据收集。获取js文件可以通过https://static.geetest.com/static/js/fullpage.9.0.2.js得到。

    请求4:get.php

    (1)请求介绍

    该请求主要发送的内容是通过执行fullpage.js文件收集的浏览器数据,用于后续设备指纹计算以及初步风险检测。如果该请求伪造得足够好,就会触发无感验证

    (2)关键步骤

    流程图

    极验get_php1请求

    a、数据收集

    浏览器数据:js文件元素、浏览器大小、浏览器插件、canvas、字体、时区等数据

    {       
            textLength,
            HTMLLength,
            documentMode,
            A,
            IMG,
            INPUT,
            LINK,SPAN,
            STYLE,
            screenLeft,
            screenTop,
            screenAvailLeft,
            screenAvailTop,
            innerWidth,
            innerHeight,
            outerWidth,
            outerHeight,
            browserLanguage,
            browserLanguages,
            devicePixelRatio,
            colorDepth,
            userAgent,
            screenWidth,
            screenHeight,
            screenAvailWidth,
            screenAvailHeight,
            localStorageEnabled,
            sessionStorageEnabled,
            indexedDBEnabled,
            platform,
            doNotTrack,
            timezone,
            canvas2DFP,
            canvas3DFP,
            plugins,
            maxTouchPoints,
            flashEnabled,
            javaEnabled,
            hardwareConcurrency,
            jsFonts,
            timestamp,
            performanceTiming
      ...等等(不完全暴露,以免被有心人利用)
    };
    

    b、格式处理

    ​ 在每个收集的数据中间,通过“!”感叹号来对数据进行切割。

    c、请求参数构造

    {
    	      gt: gt,
            challenge: challenge,
            new_captcha: true,
            protocol: https == true ? "https://" : "http://",
            beeline: scriptInfo.beeline,
            fullpage: scriptInfo.fullpage,
            static_servers: scriptInfo.static_servers,
            pencil: scriptInfo.pencil,
            click: scriptInfo.click,
            voice: scriptInfo.voice,
            slide: "/static/js/slide.7.7.5.js",
            geetest: "/static/js/geetest.6.0.9.js",
            https: https,
            i: # 收集的浏览器数据 
    }
    

    d、明文请求参数加密

    ​ 使用对称加密算法对上述明文参数进行加密(可能是AES)。

    e、构造密文请求参数

    gt: 25ba81caec944f8d74c98befd841a667
    challenge: 61f4492c9e8ea1e136e98b38107d561e
    lang: zh-cn
    pt: 0
    client_type: web
    w: Wt(lNJWNy9DeW5Z6nJck3NZCQaoyQdi3TTcxtdnFpU65OTMLZvjnrK9bgDx94DdhAlV0bvg61eh)qX0m(bWYmvFzG84QiCW7S5tLICB4QMC(zoR0YLHui9VVj6iJwWEK9lFIqklAGbsFUYHM3GEGr6mrnflcVvbIyyo8SJGIF4j70VqCLwmmcChYl4TX9GZQb0pN0)dJHSIJucHlyrrxhSpqk4b(ox65Ur4IX)De0of3r6WB78QI7)XNqxKheWL(L7peMT)f(bIl6ut5S1gO7d9dRSSZac9SjtQGUfXPNHtbm1tOts(zRdjihk8z)Zfsh)JFqM4QQgrhnd6wBOQ8pyv60bjgpONQeJdKnNBIb(SXgo)flKztgLn1cehGDcCTTQcNlnWi5E7R)(5X01pqSyc16(8YSj)CXk2T6JHUXCXXFAXrSFWs7noM4IR7KUawc1KLmu4lDLA913wOOGoCv5C06D4D48IkVeDIalagtcLwMVd(S7TAVVwWtxXXzsnxLipWbB9HjYSiYPeg3YzjvnJpbV)oDukpEkYkl2kjs53ucZ8jo33(QE09ubUvMLgQuHwIWOoqaO5VJ4ESffY)87yPJrLJprSRUTYHmuTAo6yyI0OeQGk5CHxx67iHrgzHnNxAAPZY5yrv)CJ3xcBhZgu0tk8lCYgiH1wbigIChhPgd5QTP0nJiOJPgQs76yVkvX7bLEMWJfWjLqIzZ1hd9XQmt)2yGvVLC0iiApcqGuKSvRhxvVrW01WPp6pzFOywFXULhI7vsqUOTvqoNnwJtnSv1b40F)F2y6lC8LRsj1AKBcxREtAtqKvpXOcCFPxT2qMdLKgISgYJ33RVknFDS4JfOhTk9AgXBFtSJ2zM7tpPROoRoBsPVMOrbO)mdip4Z62PxxSDS8cA0PW980wi6ZhaDamumAlxx8RQKLPW587)9Xehn5s6cIMdMFRIAubg0VXlnW5Us2IvKeI6cjEfHNMyCJz4Fmv3)IYsXh3iigq87dCjtkGlGiVTrjjo2q44e(qr0GAo5CrxuKO)EgbdLDAyqf)5WFlSx)VXn5UoZF(AunphgVIn4(vMeFVWN(fWYj(MKztePyzCi2Cdd3pLrrL2IrD7NvNo87wvdX6ro5Q6GVVHP14IvrQsArUDdnIZjz5kMJ0IG0rsd2oQL2XFndtTcuJNlRewL5KYai(K2uPNjCQmXLfEfH2LMIjerHM126aAv5EhwLuFhvxKhIjoEGoQqMGg3FZorOHWIJEt6jSDtKNwLeeUXomknlRtaVwVCJJkrR9MfM8vldLCZ..e581bf73fb48171a223c9fac8fc74f151438380e515f1775cb26d78086253beef82f250f02349285fd86ed2d52d0acb6f45fa1733340ea282c3524c432d93df20d22b28c2c382e1ad52d72b20fcc2104188b7e99d11ca440325cb4391e34d78f2122162d3e3fb3efa810139c6d1f933b1dacfdc1e044686369271275d2ac258a
    

    w参数:步骤4中对称加密后的数据(gt、chanllenge、浏览器数据、验证码js路径)+ 使用非对称加密对“对称加密密钥”进行加密后的加密串

    f、返回数据

    geetest_1605981310309({
        "status": "success",
        "data": {
            "logo": false,
            "s": "73304840",
            "i18n_labels": {
                "read_reversed": false,
                "copyright": "u7531u6781u9a8cu63d0u4f9bu6280u672fu652fu6301",
                "goto_confirm": "u524du5f80",
                "ready": "u70b9u51fbu6309u94aeu8fdbu884cu9a8cu8bc1",
                "goto_homepage": "u662fu5426u524du5f80u9a8cu8bc1u670du52a1Geetestu5b98u7f51",
                "next": "u6b63u5728u52a0u8f7du9a8cu8bc1",
                "next_ready": "u8bf7u5b8cu6210u9a8cu8bc1",
                "loading_content": "u667au80fdu9a8cu8bc1u68c0u6d4bu4e2d",
                "success": "u9a8cu8bc1u6210u529f",
                "fullpage": "u667au80fdu68c0u6d4bu4e2d",
                "reset": "u8bf7u70b9u51fbu91cdu8bd5",
                "goto_cancel": "u53d6u6d88",
                "refresh_page": "u9875u9762u51fau73b0u9519u8befu5566uff01u8981u7ee7u7eedu64cdu4f5cuff0cu8bf7u5237u65b0u6b64u9875u9762",
                "success_title": "u901au8fc7u9a8cu8bc1",
                "error_content": "u8bf7u70b9u51fbu6b64u5904u91cdu8bd5",
                "error": "u7f51u7edcu4e0du7ed9u529b",
                "error_title": "u7f51u7edcu8d85u65f6"
            },
            "static_servers": ["static.geetest.com", "dn-staticdown.qbox.me"],
            "theme": "wind",
            "feedback": "",
            "c": [12, 58, 98, 36, 43, 95, 62, 15, 12],
            "api_server": "api.geetest.com",
            "theme_version": "1.5.8"
        }
    })
    

    g、无感验证

    如果该请求伪造的浏览器信息足够好,就会触发无感验证,不需要进行加强验证。

    # Response
    geetest_1606035710872({status: "success", data: {s: "6b402d61", theme: "wind", api_server: "api.geetest.com",…}})
    data: {s: "6b402d61", theme: "wind", api_server: "api.geetest.com",…}
    api_server: "api.geetest.com"
    c: [12, 58, 98, 36, 43, 95, 62, 15, 12]
    feedback: ""
    i18n_labels: {success_title: "通过验证", refresh_page: "页面出现错误啦!要继续操作,请刷新此页面", ready: "点击按钮进行验证", next: "正在加载验证",…}
    logo: false
    s: "6b402d61"
    static_servers: ["static.geetest.com", "dn-staticdown.qbox.me"]
    theme: "wind"
    theme_version: "1.5.8"
    status: "success"
    

    请求5:ajax.php

    (1)请求介绍

    a、请求详情

    # Request URL
    https://api.geetest.com/ajax.php?
    
    # Query String Parameters
    gt: 25ba81caec944f8d74c98befd841a667
    challenge: f91e9b5f7cb34fc2fef98a1281c4f9a5
    lang: zh-cn
    pt: 0
    client_type: web
    w: PN3AyfkANbA5SEGeV3zj3wrdYwzvdZZw0hxaGHTXJUKFj7oeqLehkFa0c2Wma0D)DkvqU4xfIcbZGjnFyBK0NQ7VFAKCE(BnrKk5RDHCLXGrU3jkPh1pPGCXxywO2y2gg332yjxU7Wk7ZZzYroMNgrNZdc4ebUioVkgivWUbGFSEOBLPBPtU3Mg56FixAAO8jr1VsKXQsJFbmmMeGZ)QgmtJ9xUOhmFXjBNIbfVlsxvFljpNYaGrYxb7jV8(PhtHROTS37gGcpBoLuCXJo1iSHXEPixniDFZoQYt8r9gxFiK)CTPgwmiqXHeg0mkCQTxUTDr1)fVw9(1DCVTOXgXwCQ3LDIfdmi7bTNOqOf2F)8kXGv8g8cvMcSxkoAK(FWIblKoHjk4BT(thhJG4oyphzxQkRFLjXKE8aEmBI1Wn3legt66SGj3zZJk94OyWrkEWLyK2YnT7SYS1KVjj1Gd81mZlVA5P5sfnhZl72IRuaLGWn4jIFJhcd0dAZs5sTrIXzMpmoInN6TvMHTlux3oHs3c6l8TUPExxMoQ6oMLVAi6IZM0hrUDozyrWRJ8UT6KaeKBIgruAM)YXdQCGM4zDzL0fPwzTJC3cmlBLFmuGE(hAxbBzCuuyD8)7g2no7n0okLw9tpovsBaISZLH8pP4ujt05oz0ekEYnYZloSgQFTs40s(31TB8Pg5IO7Mg83WqgvDhKH1t1nsgqtwEmOuP6ra1yV6UHqqcg1MoPb2Rk5IbXws)utkSbrfLBlEYKVNuCqIuTqr9pvvhnHSeD5Y7pJYLBqS6sWCNQo8H()S8bQ)R2n0j8kAGUnJ27tIHzVKJE3BiO5ZO4WudFKpcqQVffhPpjtzl(f65)nLI5Hd0X7MLpXbUR36DC7FkTHwlVR4jMh3s2MboNIhpxuzzDgNzxwH9gmlgPpL3eU0s2UYGUY5L94DWTNktRlTaVEGNdpDAIoaoVKC6uf2wBJvwZh0TWrhGr2PdHiBpcmJYXlDpH0csf5PTGyBHxcNv0(AiOoKsYc0xcaLUJq)OlFBzErRIbxTnG1bfB4u1KG9vBs)qxGqux7n8DfIQ8tQCswqKk(5Yr7fnGTlO6zGlPmMQdcSfuCasd9T573MrZsIc(sX)VC5wc4Rd2BI31RVbu6P7DhQBnt)1IPPLKOmNo)liGCgG9PaFyAX(TJvyD5DDKDE)0fAbl7DD2i9NBW)Eoq9lVDalE(F8xxnlVxfQCJP)CyJEG8F0SxJo4AG6kQF(JFOEn8zH)UDbeYz1tgOWEcO0hDTdlmOIEVP1Ipmrpa95bQm4lSlbtE(vFjy2NrWt1AN)fyAgIvWaQH9bypqoUinzSxK4DJlaipaMee3Z9odzZw9aB5z9KaEixqDrCsf7H7Nfus.
    callback: geetest_1605981541804
    
    # Response
    geetest_1605981541804({"status": "success", "data": {"result": "slide"}})
    

    问题:w参数如何生成?

    (2)关键步骤

    a、数据收集

    浏览器数据:再一次收集“请求4”中的浏览器数据。
    

    b、格式处理

    ​ (1)在每个收集的数据中间,通过“!”感叹号来对数据进行切割。

    ​ (2)在每个收集的数据中间,通过“magic”来对数据进行切割。例子:11078magic data34095magic dataCSS1Compatmagic data168magic data-1magic data-1magic data-1magic

    ​ 此处相对于“请求4”有点不一样,为什么一份数据要用两种方式进行切割,请求4与请求5都发送一遍,我也没想明白。

    c、鼠标数据收集

    ​ 数据格式:行为 + x坐标 + y坐标 + 时间戳 + 行为

    var pointArray = [["move",900,400,1552388419164,"pointermove"],["move",904,397,1552388419180,"pointermove"],["move",911,381,1552388419195,"pointermove"],["move",916,379,1552388419210,"pointermove"],["move",923,377,1552388419225,"pointermove"],["move",930,373,1552388419240,"pointermove"],["move",937,369,1552388419256,"pointermove"],["move",942,366,1552388419271,"pointermove"],["move",949,364,1552388419287,"pointermove"],["move",953,362,1552388419302,"pointermove"],["move",957,360,1552388419318,"pointermove"],["move",961,356,1552388419333,"pointermove"],["move",966,352,1552388419349,"pointermove"],["move",973,350,1552388419364,"pointermove"],["move",978,348,1552388419380,"pointermove"],["move",983,345,1552388419396,"pointermove"],["move",990,343,1552388419411,"pointermove"],["move",994,340,1552388419427,"pointermove"],["move",999,336,1552388419442,"pointermove"],["down",1059,411,1552388422125,"pointerdown"],["focus",1552388422126],["up",1059,411,1552388422375,"pointerup"]];

    d、s与c参数加密

    ​ s参数与c参数是“请求4返回的”,我的理解是与s参数是“请求4”进行绑定而c参数是图片顺序(从极验服务器返回的图片是被无规则切割后的,我们需要c参数配合算法还原)

    极验打乱图片

    e、上述参数各种加密后进行再一次加密

    f、生成最终w参数

    ​ 与“请求4”中的w参数加密方法相同。

    ​ w参数:(gt, challenge, ip, version, c, s, 浏览器信息, 鼠标轨迹)对称加密 + 使用非对称加密对“对称加密密钥”进行加密后的加密串

    g、数据结构图

    ​ 此处加密结构实在是太过于冗余,所以用图的方式更清晰。

    极验w参数加密1

    请求6:slide.js

    请求介绍

    “请求5”中Response返回数据geetest_1605981541804({"status": "success", "data": {"result": "slide"}})表明,使用滑块进行加强验证。后续进行滑块验证码验证时,会使用该js进行数据收集与加密处理。

    请求详情

    # Request URL
    https://static.geetest.com/static/js/slide.7.7.5.js
    
    # Response
    返回滑块验证相关js代码
    

    请求7:get.php

    (1)请求介绍

    ​ 获取验证码相关信息,例如图片路径、图片还原数组,请求串联参数challenge、y坐标等数据。

    (2)请求详情

    geetest_1605982735902({
        "hide_delay": 800,
        "static_servers": ["static.geetest.com/", "dn-staticdown.qbox.me/"],
        "logo": false,
        "https": true,
        "width": "100%",
        "feedback": "",
        "product": "embed",
        "so": 0,
        "ypos": 37,
        "link": "",
        "version": "6.0.9",
        "fullbg": "pictures/gt/7d068eca5/7d068eca5.jpg",
        "clean": false,
        "height": 160,
        "xpos": 0,
        "theme_version": "1.2.4",
        "id": "aa812df54ff9aee0ddb35400abe906992",
        "gt": "25ba81caec944f8d74c98befd841a667",
        "s": "476e6b52",
        "api_server": "https://api.geetest.com/",
        "slice": "pictures/gt/7d068eca5/slice/b5afeb19a.png",
        "i18n_labels": {
            "logo": "u7531u6781u9a8cu63d0u4f9bu6280u672fu652fu6301",
            "cancel": "u53d6u6d88",
            "close": "u5173u95edu9a8cu8bc1",
            "error": "u8bf7u91cdu8bd5",
            "feedback": "u5e2eu52a9u53cdu9988",
            "voice": "u89c6u89c9u969cu788d",
            "success": "sec u79d2u7684u901fu5ea6u8d85u8fc7 score% u7684u7528u6237",
            "tip": "u8bf7u5b8cu6210u4e0bu65b9u9a8cu8bc1",
            "read_reversed": false,
            "refresh": "u5237u65b0u9a8cu8bc1",
            "fail": "u8bf7u6b63u786eu62fcu5408u56feu50cf",
            "forbidden": "u602au7269u5403u4e86u62fcu56feuff0cu8bf7u91cdu8bd5",
            "loading": "u52a0u8f7du4e2d...",
            "slide": "u62d6u52a8u6ed1u5757u5b8cu6210u62fcu56fe"
        },
        "theme": "ant",
        "bg": "pictures/gt/7d068eca5/bg/b5afeb19a.jpg",
        "mobile": true,
        "challenge": "a812df54ff9aee0ddb35400abe906992lw",
        "show_delay": 250,
        "benchmark": false,
        "type": "multilink",
        "fullpage": false,
        "template": "",
        "c": [12, 58, 98, 36, 43, 95, 62, 15, 12]
    })
    
    

    请求8:ajax.php

    (1)请求介绍

    该请求就是最重要的一步,验证码验证数据收集,主要收集数据包括滑块相对偏移位置(x坐标)、鼠标滑动轨迹、c参数、s参数、版本信息等。

    (2)请求详情

    # Request URL
    https://api.geetest.com/ajax.php?
    
    # Query String Param
    gt: 25ba81caec944f8d74c98befd841a667
    challenge: a812df54ff9aee0ddb35400abe906992g1
    lang: zh-cn
    pt: 0
    client_type: web
    w: 01xw)7RkAQTxgt5(KAirHJNk(GQHPSqovqV(huofhVj6LOrChUNg6NV)sMQYfBVZFGoug6B7VB0X)0rw3kI3rEXkMGOk1ewLqxZTVSDud7N6ryucakpAMXzhXRimQa4vPmjYz1nus80DQKvG7iq6XPSbdFxARitg0b4TIcRgX(3AOGK)V2cujs6ExkH7puvD9M8887mK6lCSee6FfBXrO2PdgmlamfM8omcLDwkDECw4g9fODBjYzKnSb1qq27JIyEfyBT77A1xmfhBtgJ8vKEIsm5MyR7LZGMIrXYMwd5IL0317NtnpvpeMGXey8DbABEt43y0UQDpIxkkfwbzJs6BGUKI)FGKlmO5ZA4gX5V(t951E76rZVmSAJBuNuv(doL5nYt(LdhoEq2ElpMts02jxmGT9Zkf0(H3McshaIWT5pcyM6ReRXVbOo2WFzxXZz9ITykQjFtoTr(ld4ydqpvejZSxyUZk5FIhKe4PYExT1Lms2sMXZu)gHYGFRmJf8KlYfsArButqV4zkhSajAnvE0cN1dhkB5J36rlwDqT6tG4XqJ9GbY1BcCisT1GKCEy402TCeCHeE)PfDKBeMzJ0ZeWpnVEEYmciKtc9eCfdklIrEUefWMYDdX0IUIDyjQ7rvPghprHhdw(uFp1UPAmTraHyxqVAOcJBd1YFkOLI9xoBdmFP9n0UJVXtuzcCvVNIPPBznXmw6RaEoGg(i1((OkQeu9lp4BqFRQmS76NFd5oJ1LVT5o)((CzOsB03X2L6FIeLVw(v6Y09QAmFRfqw..7bce8d8ab16eaf8c1342a4a7b3e7b0100f58082dd49d8cc5d8ee528f161bb0ba579580015dce1747d454b545158b47f0bf4660f293adf3fc8392a86f498eec6ebb5fb6bc891e696987aef7d9d5282d9dce43729ac87a3515283b833b028bca48a5d5004842cd88bee068f495fbcb02ae4c493bc51dbb67811bb49852f498be64
    callback: geetest_1605984542722
    
    # Response
    geetest_1605984542722({"message": "success", "success": 0})
    

    关键步骤

    a、图片还原

    ​ 配合前序请求返回的c数组和图片还原算法对被切割打乱的图片进行还原。

    b、缺口识别

    ​ 计算x坐标可以参考我的另一篇文章《第三代验证码研究》https://www.cnblogs.com/boycelee/p/11363611.html

    c、w参数

    (gt, challenge, x坐标, 滑动轨迹, c参数, s参数, 版本)对称加密 + 使用非对称加密对“对称加密密钥”进行加密后的加密串

    ​ 使用对称加密对参数进行加密,再使用非对称加密对密钥进行加密

    d、数据图

    ​ 此处加密结构实在是太过于冗余,所以用图的方式更清晰

    极验w参数加密2

    4、整体流程

    极验整体流程

    三、成果展示

    极验成果

    一旦验证码验证通过就会返回validate。validate可以理解为通行令牌,该令牌会将环境检测数据、行为数据以及风险结果等数据进行串联,一般情况下如果成功获取到validate参数,就预示着我们破解极验验证码工作取得成功。

    四、总结

    总体来说,极验验证码的整体设计不算复杂,但数据加密实在是太过于冗余复杂了。从设计角度上看中规中矩,环境数据收集 -> 环境检测 -> 加强验证/无感验证 -> 再次数据收集(环境 + 行为)-> 完成验证。相对而言我个人觉得顶象和瑞数的设计可能更有特点一些,在破解和对抗的难度上来讲,它们也相对更难一些。

    五、最后

    本文配合其他文章一起服用效果更好,能更全面体会安全产品的设计。
    (1)《第三代验证码研究》https://www.cnblogs.com/boycelee/p/11363611.html(推荐)

    (2)《顶象验证码破解与研究》https://www.cnblogs.com/boycelee/p/14269941.html(推荐)

    (3)《极验验证码破解与研究》https://www.cnblogs.com/boycelee/p/14021048.html(推荐)

    (4)《极验无感验证破解》https://www.cnblogs.com/boycelee/p/13951819.html

    (5)《同盾小程序指纹破解》https://www.cnblogs.com/boycelee/category/1819211.html

    本文不提供完整解决方案和完整数据,仅用于理论研究,维护网络安全,人人有责。


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  • 原文地址:https://www.cnblogs.com/boycelee/p/14021048.html
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