147 lines
5.6 KiB
PHP
147 lines
5.6 KiB
PHP
<?php
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/**
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* [Discuz!] (C)2001-2099 Comsenz Inc.
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* This is NOT a freeware, use is subject to license terms
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*
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* $Id: misc_security.php 25889 2011-11-24 09:52:20Z monkey $
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*/
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if(!defined('IN_DISCUZ')) {
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exit('Access Denied');
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}
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global $_G;
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if(is_string($this->config['security']['attackevasive'])) {
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$attackevasive_tmp = explode('|', $this->config['security']['attackevasive']);
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$attackevasive = 0;
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foreach($attackevasive_tmp AS $key => $value) {
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$attackevasive += intval($value);
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}
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unset($attackevasive_tmp);
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} else {
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$attackevasive = $this->config['security']['attackevasive'];
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}
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$lastrequest = isset($_G['cookie']['lastrequest']) ? authcode($_G['cookie']['lastrequest'], 'DECODE') : '';
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if($attackevasive & 1 || $attackevasive & 4) {
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dsetcookie('lastrequest', authcode(TIMESTAMP, 'ENCODE'), TIMESTAMP + 816400, 1, true);
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}
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if($attackevasive & 1) {
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if(TIMESTAMP - $lastrequest < 1) {
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securitymessage('attackevasive_1_subject', 'attackevasive_1_message');
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}
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}
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if(($attackevasive & 2) && ($_SERVER['HTTP_X_FORWARDED_FOR'] ||
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$_SERVER['HTTP_VIA'] || $_SERVER['HTTP_PROXY_CONNECTION'] ||
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$_SERVER['HTTP_USER_AGENT_VIA'] || $_SERVER['HTTP_CACHE_INFO'] ||
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$_SERVER['HTTP_PROXY_CONNECTION'])) {
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securitymessage('attackevasive_2_subject', 'attackevasive_2_message', FALSE);
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}
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if($attackevasive & 4) {
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if(empty($lastrequest) || TIMESTAMP - $lastrequest > 300) {
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securitymessage('attackevasive_4_subject', 'attackevasive_4_message');
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}
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}
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if($attackevasive & 8) {
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list($visitcode, $visitcheck, $visittime) = explode('|', authcode($_G['cookie']['visitcode'], 'DECODE'));
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if(!$visitcode || !$visitcheck || !$visittime || TIMESTAMP - $visittime > 60 * 60 * 4 ) {
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if(empty($_POST['secqsubmit']) || ($visitcode != md5($_POST['answer']))) {
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$answer = 0;
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$question = '';
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for ($i = 0; $i< rand(2, 5); $i ++) {
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$r = rand(1, 20);
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$question .= $question ? ' + '.$r : $r;
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$answer += $r;
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}
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$question .= ' = ?';
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dsetcookie('visitcode', authcode(md5($answer).'|0|'.TIMESTAMP, 'ENCODE'), TIMESTAMP + 816400, 1, true);
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securitymessage($question, '<input type="text" name="answer" size="8" maxlength="150" /><input type="submit" name="secqsubmit" class="button" value=" Submit " />', FALSE, TRUE);
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} else {
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dsetcookie('visitcode', authcode($visitcode.'|1|'.TIMESTAMP, 'ENCODE'), TIMESTAMP + 816400, 1, true);
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}
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}
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}
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function securitymessage($subject, $message, $reload = TRUE, $form = FALSE) {
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global $_G;
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$scuritylang = array(
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'attackevasive_1_subject' => '频繁刷新限制',
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'attackevasive_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 ...',
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'attackevasive_2_subject' => '代理服务器访问限制',
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'attackevasive_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。',
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'attackevasive_4_subject' => '页面重载开启',
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'attackevasive_4_message' => '欢迎光临本站，页面正在重新载入，请稍候 ...'
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);
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$subject = $scuritylang[$subject] ? $scuritylang[$subject] : $subject;
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$message = $scuritylang[$message] ? $scuritylang[$message] : $message;
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if($_GET['inajax']) {
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security_ajaxshowheader();
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echo '<div id="attackevasive_1" class="popupmenu_option"><b style="font-size: 16px">'.$subject.'</b><br /><br />'.$message.'</div>';
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security_ajaxshowfooter();
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} else {
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echo '<html>';
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echo '<head>';
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echo '<title>'.$subject.'</title>';
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echo '</head>';
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echo '<body bgcolor="#FFFFFF">';
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if($reload) {
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echo '<script language="JavaScript">';
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echo 'function reload() {';
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echo ' document.location.reload();';
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echo '}';
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echo 'setTimeout("reload()", 1001);';
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echo '</script>';
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}
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if($form) {
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echo '<form action="'.$G['PHP_SELF'].'" method="post" autocomplete="off">';
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}
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echo '<table cellpadding="0" cellspacing="0" border="0" width="700" align="center" height="85%">';
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echo ' <tr align="center" valign="middle">';
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echo ' <td>';
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echo ' <table cellpadding="10" cellspacing="0" border="0" width="80%" align="center" style="font-family: Verdana, Tahoma; color: #666666; font-size: 11px">';
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echo ' <tr>';
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echo ' <td valign="middle" align="center" bgcolor="#EBEBEB">';
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echo ' <br /><br /> <b style="font-size: 16px">'.$subject.'</b> <br /><br />';
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echo $message;
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echo ' <br /><br />';
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echo ' </td>';
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echo ' </tr>';
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echo ' </table>';
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echo ' </td>';
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echo ' </tr>';
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echo '</table>';
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if($form) {
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echo '</form>';
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}
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echo '</body>';
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echo '</html>';
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}
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exit();
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}
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function security_ajaxshowheader() {
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$charset = getglobal('config/output/charset');
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ob_end_clean();
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@header("Expires: -1");
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@header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
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@header("Pragma: no-cache");
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header("Content-type: application/xml");
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echo "<?xml version=\"1.0\" encoding=\"".$charset."\"?>\n<root><![CDATA[";
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}
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function security_ajaxshowfooter() {
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echo ']]></root>';
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exit();
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}
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?>
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