基于Discuz security.inc.php代码的深入分析

日期：2020-06-07 栏目：程序人生浏览：次

<?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_cookies
if($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 1
if($attackevasive & 1) {
if($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8
if($attackevasive & 8) {
list($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'][$questionkey]['question'], '<input type="text" size="8" maxlength="150" /><input type="submit" value=" Submit " />', FALSE, TRUE);
} else {
dsetcookie('secqcode', authcode($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><b>'.$subject.'</b><br /><br />'.$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">';
echo ' <tr valign="middle">';
echo '    <td>';
echo '    <table cellpadding="10" cellspacing="0">';
echo '    <tr>';
echo '      <td valign="middle" bgcolor="#EBEBEB">';
echo '     <br /><br /> <b>'.$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, $inajax;
ob_end_clean();
@header("Expires: -1");
@header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
@header("Pragma: no-cache");
header("Content-type: application/xml");
echo "<?xml version=https://www.jb51.net/"1.0/" encoding=https://www.jb51.net/"$charset/"?>/n<root><![CDATA[";
}

function ajaxshowfooter() {
echo ']]></root>';
}

?>

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基于Discuz security.inc.php代码的深入分析

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