攻击者使用代理服务器向受害主机生成合法请求，实现DOS，并将其伪装成cc(challengecoloslapar)。这种攻击模式已经是老技术了，甚至不是技术。但是现在，还是有很多主机抵挡不住CC的骚扰。
可以说，CC攻击的适用性和破坏性并不比DDOS差。经过几天的实验，发现政府相关部门的很多网站都无法支持CC攻击，更别说很多Wordpress用户了。WordPress以其强大的功能和强大的扩展性统治着博客世界，但在强大的功能背后，它更容易受到攻击。我最初写了一篇关于WordPress，Blog或者CMS的文章？提到Wordpress强大到足以成为CMS网站，但现在看来，要让Wordpress成为大型网站，还得采取一些防范措施。
反应时间到进入时间在1秒以内的网站一旦被CC攻击，几秒钟就能反应20秒以上，甚至拒绝服务。听起来很可怕吗？先说说PHP大型网站如何判断是否是CC攻击(代理访问)。原则是拒绝代理访问。这样会拦截少量的访客，但是对于那大量的访客，又有什么意义呢？
建立个cc.php
代码如下:
<?php
define('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>");
}
}
调用:
WordPress 调用，主题/header.php 第一行添加代码：
<?php get_template_part( 'template/cc' ); ?>
