如何防止CC攻击？

时间：2023-8-27 00:09 作者：六思逸 分类： 前端

随着互联网的发展，网站安全问题越来越受到人们的关注

其中，CC攻击是一种常见的攻击方式，可以通过大量的请求来使网站瘫痪

为了保障网站的安全性，我们可以为网站添加一个简单的CC防御脚本

本文将介绍如何添加这个脚本，并探讨其实现原理

代码实现

1.首先在根目录建个 fcc.php 文件代码如下：

<?phpdefine('SYSTEM_ROOT', dirname(preg_replace('@\\(.*\\(.*$@', '', preg_replace('@\\(.*\\(.*$@', '', __FILE__))) . '/');session_start();date_default_timezone_set('Asia/Shanghai');header('Content-Type: text/html; charset=UTF-8');function getspider($useragent=''){ if(CC_Defender==2)return false; if(!$useragent){$useragent = $_SERVER['HTTP_USER_AGENT'];}$useragent=strtolower($useragent); if (strpos($useragent, 'baiduspider') !== false){return 'baiduspider';} if (strpos($useragent, 'googlebot') !== false){return 'googlebot';} if (strpos($useragent, 'soso') !== false){return 'soso';} if (strpos($useragent, 'bing') !== false){return 'bing';} if (strpos($useragent, 'yahoo') !== false){return 'yahoo';} if (strpos($useragent, 'sohu-search') !== false){return 'Sohubot';} if (strpos($useragent, 'sogou') !== false){return 'sogou';} if (strpos($useragent, 'youdaobot') !== false){return 'YoudaoBot';} if (strpos($useragent, 'yodaobot') !== false){return 'YodaoBot';} if (strpos($useragent, 'robozilla') !== false){return 'Robozilla';} if (strpos($useragent, 'msnbot') !== false){return 'msnbot';} if (strpos($useragent, 'lycos') !== false){return 'Lycos';} if (strpos($useragent, 'ia_archiver') !== false || strpos($useragent, 'iaarchiver') !== false){return 'alexa';} if (strpos($useragent, 'archive.org_bot') !== false){return 'Archive';} if (strpos($useragent, 'robozilla') !== false){return 'Robozilla';} if (strpos($useragent, 'sitebot') !== false){return 'SiteBot';} if (strpos($useragent, 'mj12bot') !== false){return 'MJ12bot';} if (strpos($useragent, 'gosospider') !== false){return 'gosospider';} if (strpos($useragent, 'gigabot') !== false){return 'Gigabot';} if (strpos($useragent, 'yrspider') !== false){return 'YRSpider';} if (strpos($useragent, 'gigabot') !== false){return 'Gigabot';} if (strpos($useragent, 'jikespider') !== false){return 'jikespider';} if (strpos($useragent, 'addsugarspiderbot') !== false){return 'AddSugarSpiderBot';/*非常少*/} if (strpos($useragent, 'testspider') !== false){return 'TestSpider';} if (strpos($useragent, 'etaospider') !== false){return 'EtaoSpider';} if (strpos($useragent, 'wangidspider') !== false){return 'WangIDSpider';} if (strpos($useragent, 'foxspider') !== false){return 'FoxSpider';} if (strpos($useragent, 'docomo') !== false){return 'DoCoMo';} if (strpos($useragent, 'yandexbot') !== false){return 'YandexBot';} if (strpos($useragent, 'ezooms') !== false){return 'Ezooms';/*个人*/} if (strpos($useragent, 'sinaweibobot') !== false){return 'SinaWeiboBot';} if (strpos($useragent, 'catchbot') !== false){return 'CatchBot';} if (strpos($useragent, 'surveybot') !== false){return 'SurveyBot';} if (strpos($useragent, 'dotbot') !== false){return 'DotBot';} if (strpos($useragent, 'purebot') !== false){return 'Purebot';} if (strpos($useragent, 'ccbot') !== false){return 'CCBot';} if (strpos($useragent, 'mlbot') !== false){return 'MLBot';} if (strpos($useragent, 'adsbot-google') !== false){return 'AdsBot-Google';} if (strpos($useragent, 'ahrefsbot') !== false){return 'AhrefsBot';} if (strpos($useragent, 'spbot') !== false){return 'spbot';} if (strpos($useragent, 'augustbot') !== false){return 'AugustBot';} return false; } if($_GET['rand'] && $_SESSION['rand_session']!=$_GET['rand']){ @header('Content-Type: text/html; charset=UTF-8'); exit('<b>浏览器不支持 COOKIE 或者不正常访问！</b>'); } if(!$_SESSION['rand_session'] && $nosecu!=true){ if(!getspider()){ $rand_session=md5(uniqid().rand(1,1000)); $_SESSION['rand_session']=$rand_session; exit("<!DOCTYPE HTML> <html> <head> <meta charset=\"UTF-8\"/> <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1\" /> <title>安全检查中...</title> <script> var i = 5; var intervalid; intervalid = setInterval(\"fun()\", 1000);function fun() {if (i == 0) {window.location.href = \"?{$_SERVER['QUERY_STRING']}&rand={$rand_session}\";clearInterval(intervalid);}document.getElementById(\"mes\").innerHTML = i;i--;}</script><style> html, body {width: 100%; height: 100%; margin: 0; padding: 0;} body {background-color: #ffffff; font-family: Helvetica, Arial, sans-serif; font-size: 100%;} h1 {font-size: 1.5em; color: #404040; text-align: center;} p {font-size: 1em; color: #404040; text-align: center; margin: 10px 0 0 0;} #spinner {margin: 0 auto 30px auto; display: block;} .attribution {margin-top: 20px;} </style> </head><body> <table width=\"100%\" height=\"100%\" cellpadding=\"20\"> <tr> <td align=\"center\" valign=\"middle\"> <noscript><h2>请打开浏览器的 javascript，然后刷新浏览器</h2></noscript> <h1><span data-translate=\"checking_browser\">浏览器安全检查中...</span></h1> <p data-translate=\"process_is_automatic\"></p> <p data-translate=\"allow_5_secs\">还剩 <span id=\"mes\">5</span> 秒</p> </div></div> </td> </tr></table></body></html>");}}

2.调用代码 PHP 通用调用，在头部或主要文件内文件加入：

<?php include 'fcc.php'; ?>

实现原理

CC防御脚本的实现原理是利用了五秒盾的原理。具体来说，当访问者第一次访问网站时，脚本会检测浏览器是否支持COOKIE，并将COOKIE存储在$_COOKIE[‘check_cc’]中。如果浏览器支持COOKIE，则可以正常访问网站。否则，将会显示一个提示页面，并倒计时5秒后跳转到其他页面。

同时，该脚本还会过滤掉搜索引擎蜘蛛，不会影响搜索引擎的收录

标签: PHP代码添加简单的CC防御脚本

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