失眠网 > 【网络安全】某安全网关前端JS分析

【网络安全】某安全网关前端JS分析

时间：2019-07-05 11:24:57

相关推荐

【网络安全】某安全网关前端JS分析

一、前言

xxx是一款用于前端防御自动化工具的安全网关，核心代码由服务器下发给客户端执行，通过cookie将执行结果带回，再根据js获取的前端数据判断用户是否异常，完成安全检测

二、代码入口

js计算结果通过cookie传给服务器，参数名为：8PHkpr8y、JF7cGtR5、SflKxwRJ

经过调试分析，代码明文存放在ng_dynamic_defend文件中，核心逻辑位于尾部这几行

三、读取配置

get_global（）函数读取配置信息，放入_global_config中

window**.**config **=** 'eyJmaW5nZXIiOnsibmFtZSI6IkpGN2NHdFI1In0sImJvdCI6eyJlbmFibGVkIjp0cnVlLCJuYW1lIjoiOFBIa3ByOHkifSwic3VibWl0Ijp7ImVuYWJsZWQiOnRydWUsIm5hbWUiOiJVVmpES082biIsInVybCI6IiJ9LCJ0b2tlbiI6eyJlbmFibGVkIjp0cnVlLCJuYW1lIjoiU2ZsS3h3UkoiLCJ1cmwiOiJqc190ZXN0LmNvbTsiLCJpc19jaGVja191cmkiOnRydWUsImlzX2NoZWNrX2dldCI6dHJ1ZX0sImNvbnRlbnQiOnsiZW5hYmxlZCI6ZmFsc2UsIm5hbWUiOiJTZmxLeHdSSiIsImNvbmZ1c2VfdHlwZSI6IjAifSwic2NyaXB0Ijp7ImlzX2FudGlfZGVidWciOmZhbHNlfX0='**;****!****function** **(**global**)** **{****function** _base64_parse**(**e**)** **{****return** CryptoJS**.**enc**.**Base64**.**parse**(**e**).**toString**(**CryptoJS**.**enc**.**Utf8**)****}****function** get_global**()** **{****var** e **=** _base64_parse**(**global**.**config**),**t **=** JSON**.**parse**(**e**);**_global_config **=** global**.**nY1vq7Gi **=** t**}****}(**window**);***/***{**"finger": {**"name": "JF7cGtR5"**},**"bot": {**"enabled": true,**"name": "8PHkpr8y"**},**"submit": {**"enabled": true,**"name": "UVjDKO6n",**"url": ""**},**"token": {**"enabled": true,**"name": "SflKxwRJ",**"url": ";",**"is_check_uri": true,**"is_check_get": true**},**"content": {**"enabled": false,**"name": "SflKxwRJ",**"confuse_type": "0"**},**"script": {**"is_anti_debug": false**}**}***/*

【点击查看资料详细】

四、数据采集

以下三个函数会使用到window对象来采集客户端数据：

get_tool_feature() 获得工具特征get_browser_feature() 获得浏览器特征get_fingerprint() 获得浏览器指纹

1.get_tool_feature()

get_webdriver**()** *//window.navigator.webdriver* get_phantomjs**()** *//window.navigator.userAgent*get_bot**()** *//检测关键字：'__webdriver_evaluate','__selenium_evaluate','__webdriver_script_function','__webdriver_script_func','__webdriver_script_fn','__fxdriver_evaluate','__driver_unwrapped','__webdriver_unwrapped','__driver_evaluate','__selenium_unwrapped','__fxdriver_unwrapped''_phantom','__nightmare','_selenium','callPhantom','callSelenium','_Selenium_IDE_Recorder'*get_navigator_for_tool**()** *//window.navigator.languages*get_canvas_for_tool**()** *//window.document.createElement('canvas').getContext*get_storage_for_tool**()** *//window.localStorage && window.sessionStorage*get_consol**()** *//window.console.log(1)*get_awvs**()** *//检测关键字：'SimpleDOMXSSClass','MarvinHooks','MarvinPageExplorer','HashDOMXSSClass'*get_appscan**()** *//检测关键字：'appScanSendReplacement','appScanOnReadyStateChangeReplacement','appScanLoadHandler','appScanSetPageLoaded'*

2.get_browser_feature()

get_indexedDB**()** *//window.indexedDB*get_openDatabase**()** *//window.openDatabase*get_localStorage**()** *//window.localStorage*get_sessionStorage**()** *//window.sessionStorage*get_audio**()** *//window.AudioContext.destination*get_file**()** *//'object' == typeof File || 'function' == typeof File*isCanvasSupported**()** *//window.document.createElement('canvas').getContext*isWebGlSupported**()** *//window.WebGLRenderingContext || window.document.createElement('canvas').getContext('webgl')*get_plugins**()** *//window.navigator.plugins*get_languages**()** *//window.navigator.languages*get_platform**()** *//window.navigator.platform*get_cpuClass**()** *//_navigator.cpuClass*get_hardwareConcurrency**()** *//_navigator.hardwareConcurrency*get_namespaces**()** *//window.document.namespaces*get_documentMode**()** *//window.document.documentMode*get_ActivexObject**()** *//window.document.ActivexObject*get_StyleMedia**()** *//window.StyleMedia*get_opera**()** *//window.opera*get_firefox**()** *//'undefined' != typeof InstallTrigger*get_chrome**()** *//window.chrome*get_safari**()** *///constructor/i.test(window.HTMLElement) || '[object SafariRemoteNotification]' === (!window.safari || safari.pushNotification).toString()*

3.get_fingerprint()

get_indexedDB**()** *//window.indexedDB*get_openDatabase**()** *//window.openDatabase*get_localStorage**()** *//window.localStorage*get_sessionStorage**()** *//window.sessionStorage*get_audio**()** *//window.AudioContext.destination*get_file**()** *//'object' == typeof File || 'function' == typeof File*get_canvas**()** *//window.document.createElement('canvas')*get_webgl**()** *//window..document.createElement('canvas').getContext('webgl')*get_webgl_render**()** *//window.document.createElement('canvas').getContext('webgl')*get_plugins**()** *//window.navigator.plugins*get_language**()** *//window.navigator.language || window.navigator.userLanguage || window.navigator.browserLanguage || window.navigator.systemLanguage ||*get_languages**()** *//window.navigator.languages*get_platform**()** *//window.navigator.platform*get_cpuClass**()** *//window.navigator.cpuClass*get_hardwareConcurrency**()** *//window.navigator.hardwareConcurrency*get_timezone_offset**()** *//(new Date).getTimezoneOffset()*get_timezone**()** *//window.Intl && window.Intl.DateTimeFormat*get_screen_ratio**()** *//window.screen.width / window.screen.height * 100*get_screen_resolution**()** *//window.screen.availHeight + 'X' + window.screen.availWidth + 'X' + window.screen.availLeft + 'X' + window.screen.availTop*get_touch_support**()** *//window.navigator.maxTouchPoints || window.navigator.msMaxTouchPoints*get_media_devices**()** *//window.navigator.mediaDevices && window.navigator.mediaDevices.enumerateDevices*get_battery**()** *//window.navigator.getBattery*get_adBlock**()** *//window.document.getElementsByClassName('adsbox') [0].offsetHeight*get_userAgent**()** *//window.navigator.userAgent*

4.数据处理

set_bot_cookie()、set_fingerprint()两个函数分别将tool_feature、browser_feature与fingerprint加密写入到cokie中，变量名为：8PHkpr8y、JF7cGtR5

1.set_bot_cookie()

2.set_fingerprint()

五、事件监听

1.a标签

设置EventListenerEx()监听，当页面加载完成时触发load_func()，对当前cookie执行base64编码操作，并设置参数名为KBwtGA

**function** confuse_cookie**()** **{****var** e**;**_document**.**cookie **&&** **0** **!=** _global_config**.**content**.**enabled **&&** '1' **==** _global_config**.**content**.**confuse_type **&&** **(**e **=** _document**.**cookie**,** clearAllCookie**(),** CookieUtil**.**set**(**'KBwtGA'**,** btoa**(**e**)))****}**

当发生点击事件时触发a_click_handler()，对请求地址添加令牌，变量名为SflKxwRJ

replace_url()调用get_token()生成加密tonken

2.form表单

设置EventListenerEx()监听，当发生表单事件时触发form_hook()，调用get_submit()对表单内数据加密，参数名为UVjDKO6n，调用get_token()生成加密tonken，参数名为SflKxwRJ

3.ajax请求

当发生ajax事件时触发ajax_hook()，对不同请求方式做了单独处理

监听到get请求时调用get_body_for_get()对args数据使用get_token()加密，监听到post请求时调用get_body_for_post()对请求体get_submit()加密、对url使用replace_url()调用get_token()生成加密tonken