<?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 $
*/

//如果沒有設定 IN_DISCUZ ，則訪問出錯
if(!defined('IN_DISCUZ')) {
exit('Access Denied');
}

// 使用位移 $attackevasive 來設定 論壇防御級別 ，如果是 1 或者是 4 的話， 1=cookie 刷新限制 ， 4=二次請求
// 讀取上次時間到當前存放cookies數組，并將現在時間放置cookies
// 將$_DCOOKIE['lastrequest'] 不斷加密 存放last訪問時間到 lastrequest_cookies
if($attackevasive & 1 || $attackevasive & 4) {
$_DCOOKIE['lastrequest'] = authcode($_DCOOKIE['lastrequest'], 'DECODE');
dsetcookie('lastrequest', authcode($timestamp, 'ENCODE'), $timestamp + 816400, 1, true);
}

//如果確認被攻擊，則展示提示語 1
if($attackevasive & 1) {
if($timestamp - $_DCOOKIE['lastrequest'] < 1) {
securitymessage('attachsave_1_subject', 'attachsave_1_message');
}
}


//如檢查到 HTTP_X_FORWARDED_FOR 有以下 參數 ，將提示 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);
}

//如果在限定的時間內訪問多次，將判斷為二次請求
if($attackevasive & 4) {
if(empty($_DCOOKIE['lastrequest']) || $timestamp - $_DCOOKIE['lastrequest'] > 300) {
securitymessage('attachsave_4_subject', 'attachsave_4_message');
}
}


//如果需要回答問題，則判斷為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'][$questionkey]['question'], '<input type="text" name="answer" size="8" maxlength="150" /><input class="button" type="submit" name="secqsubmit" value=" Submit " />', FALSE, TRUE);
} else {
dsetcookie('secqcode', authcode($questionkey.'|'.$_DCACHE['secqaa'][$questionkey]['answer'].'|'.$timestamp, 'ENCODE'), $timestamp + 816400, 1, true);
}
}

}

/**
* 輸出被攻擊提示語言，如果是ajax，展示一 主站蜘蛛池模板： 乐亭县| 琼结县| 铅山县| 岚皋县| 中方县| 塔河县| 日土县| 漯河市| 永福县| 滦平县| 五寨县| 五原县| 依兰县| 晋中市| 兖州市| 余庆县| 常德市| 宝山区| 南投县| 绥江县| 洛阳市| 阳泉市| 巩留县| 宁远县| 都匀市| 鞍山市| 东源县| 中阳县| 洞头县| 衡阳县| 安宁市| 玉溪市| 得荣县| 汤原县| 黄石市| 新乡县| 哈巴河县| 陵水| 罗定市| 石柱| 阳朔县|