基于Discuz security.inc.php代码的深入分析
2013-08-21 09:27 来源: 站长圈 点击:
本篇文章是对Discuz security.inc.php的代码进行了详细的分析介绍，需要的朋友参考下
代码如下所示：
复制代码 代码如下:
<?php/*[Discuz!] (C)2001-2009 Comsenz Inc.This is NOT a freeware, use is subject to license terms$Id: security.inc.php 16688 2008-11-14 06:41:07Z cnteacher $*///如果没有设定 IN_DISCUZ ，则访问出错if(!defined('IN_DISCUZ')) {exit('Access Denied');}// 使用位移 $attackevasive 来设定 论坛防御级别 ，如果是 1 或者是 4 的话， 1=cookie 刷新限制 ， 4=二次请求// 读取上次时间到当前存放cookies数组，并将现在时间放置cookies// 将$_DCOOKIE['lastrequest'] 不断加密 存放last访问时间到 lastrequest_cookiesif($attackevasive & 1 || $attackevasive & 4) {$_DCOOKIE['lastrequest'] = authcode($_DCOOKIE['lastrequest'], 'DECODE');dsetcookie('lastrequest', authcode($timestamp, 'ENCODE'), $timestamp + 816400, 1, true);}//如果确认被攻击，则展示提示语 1if($attackevasive & 1) {if($timestamp - $_DCOOKIE['lastrequest'] < 1) {securitymessage('attachsave_1_subject', 'attachsave_1_message');}}//如检查到 HTTP_X_FORWARDED_FOR 有以下 参数 ，将提示 使用代理if(($attackevasive & 2) && ($_SERVER['HTTP_X_FORWARDED_FOR'] ||$_SERVER['HTTP_VIA'] || $_SERVER['HTTP_PROXY_CONNECTION'] ||$_SERVER['HTTP_USER_AGENT_VIA'] || $_SERVER['HTTP_CACHE_INFO'] ||$_SERVER['HTTP_PROXY_CONNECTION'])) {securitymessage('attachsave_2_subject', 'attachsave_2_message', FALSE);}//如果在限定的时间内访问多次，将判断为二次请求if($attackevasive & 4) {if(empty($_DCOOKIE['lastrequest']) || $timestamp - $_DCOOKIE['lastrequest'] > 300) {securitymessage('attachsave_4_subject', 'attachsave_4_message');}}//如果需要回答问题，则判断为8if($attackevasive & 8) {list($questionkey, $questionanswer, $questiontime) = explode('|', authcode($_DCOOKIE['secqcode'], 'DECODE'));include_once DISCUZ_ROOT.'./forumdata/cache/cache_secqaa.php';if(!$questionanswer || !$questiontime || $_DCACHE['secqaa'][$questionkey]['answer'] != $questionanswer) {if(empty($_POST['secqsubmit']) || (!empty($_POST['secqsubmit']) && $_DCACHE['secqaa'][$questionkey]['answer'] != md5($_POST['answer']))) {$questionkey = array_rand($_DCACHE['secqaa']);dsetcookie('secqcode', authcode($questionkey.'||'.$timestamp, 'ENCODE'), $timestamp + 816400, 1, true);securitymessage($_DCACHE['secqaa'][$questionkey]['question'], '<input type="text" name="answer" size="8" maxlength="150" /><input class="button" type="submit" name="secqsubmit" value=" Submit " />', FALSE, TRUE);} else {dsetcookie('secqcode', authcode($questionkey.'|'.$_DCACHE['secqaa'][$questionkey]['answer'].'|'.$timestamp, 'ENCODE'), $timestamp + 816400, 1, true);}}}/*** 输出被攻击提示语言，如果是ajax，展示一個错误層， 如果是請求， 則展示错误頁面* @param $subject* @param $message* @param $reload* @param $form* @return unknown_type*/function securitymessage($subject, $message, $reload = TRUE, $form = FALSE) {$scuritylang = array('attachsave_1_subject' => '频繁刷新限制','attachsave_1_message' => '您访问本站速度过快或者刷新间隔时间小于两秒！请等待页面自动跳转 ...','attachsave_2_subject' => '代理服务器访问限制','attachsave_2_message' => '本站现在限制使用代理服务器访问，请去除您的代理设置，直接访问本站。','attachsave_4_subject' => '页面重载开启','attachsave_4_message' => '欢迎光临本站，页面正在重新载入，请稍候 ...');$subject = $scuritylang[$subject] ? $scuritylang[$subject] : $subject;$message = $scuritylang[$message] ? $scuritylang[$message] : $message;if($_GET['inajax']) {ajaxshowheader();echo '<div id="attackevasive_1" class="popupmenu_option"><b style="font-size: 16px">'.$subject.'</b><br /><br />'.$message.'</div>';ajaxshowfooter();} else {echo '<html>';echo '<head>';echo '<title>'.$subject.'</title>';echo '</head>';echo '<body bgcolor="#FFFFFF">';if($reload) {echo '<script language="JavaScript">';echo 'function reload() {';echo ' document.location.reload();';echo '}';echo 'setTimeout("reload()", 1001);';echo '</script>';}if($form) {echo '<form action="'.$_SERVER['PHP_SELF'].'" method="POST">';}echo '<table cellpadding="0" cellspacing="0" border="0" width="700" align="center" height="85%">';echo ' <tr align="center" valign="middle">';echo ' <td>';echo ' <table cellpadding="10" cellspacing="0" border="0" width="80%" align="center" style="font-family: Verdana, Tahoma; color: #666666; font-size: 11px">';echo ' <tr>';echo ' <td valign="middle" align="center" bgcolor="#EBEBEB">';echo ' <br /><br /> <b style="font-size: 16px">'.$subject.'</b> <br /><br />';echo $message;echo ' <br /><br />';echo ' </td>';echo ' </tr>';echo ' </table>';echo ' </td>';echo ' </tr>';echo '</table>';if($form) {echo '</form>';}echo '</body>';echo '</html>';}exit();}function ajaxshowheader() {global $charset, $inajax;ob_end_clean();@header("Expires: -1");@header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);@header("Pragma: no-cache");header("Content-type: application/xml");echo "<?xml version=/"1.0/" encoding=/"$charset/"?>/n<root><![CDATA[";}function ajaxshowfooter() {echo ']]></root>';}?>
