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基于Discuzsecurity.inc.php代码的深入分析

PHP代码 基于 深入分析 INC
2023-06-13 09:15:00 时间

代码如下所示：

复制代码代码如下:

<?php

/*
[Discuz!](C)2001-2009ComsenzInc.
ThisisNOTafreeware,useissubjecttolicenseterms

$Id:security.inc.php166882008-11-1406:41:07Zcnteacher$
*/

//如果没有设定IN_DISCUZ，则访问出错
if(!defined("IN_DISCUZ")){
exit("AccessDenied");
}

//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($_DCOOKIE["secqcode"],"DECODE"));
include_onceDISCUZ_ROOT."./forumdata/cache/cache_secqaa.php";
if(!$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"][$questionkey]["question"],"<inputtype="text"name="answer"size="8"maxlength="150"/><inputclass="button"type="submit"name="secqsubmit"value="Submit"/>",FALSE,TRUE);
}else{
dsetcookie("secqcode",authcode($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??错误?樱如果是?求，?t展示错误?面
 *@param$subject
 *@param$message
 *@param$reload
 *@param$form
 *@returnunknown_type
 */
functionsecuritymessage($subject,$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($_GET["inajax"]){
ajaxshowheader();
echo"<divid="attackevasive_1"class="popupmenu_option"><bstyle="font-size:16px">".$subject."</b><br/><br/>".$message."</div>";
ajaxshowfooter();
}else{
echo"<html>";
echo"<head>";
echo"<title>".$subject."</title>";
echo"</head>";
echo"<bodybgcolor="#FFFFFF">";
if($reload){
echo"<scriptlanguage="JavaScript">";
echo"functionreload(){";
echo"document.location.reload();";
echo"}";
echo"setTimeout("reload()",1001);";
echo"</script>";
}
if($form){
echo"<formaction="".$_SERVER["PHP_SELF"].""method="POST">";
}
echo"<tablecellpadding="0"cellspacing="0"border="0"width="700"align="center"height="85%">";
echo" <tralign="center"valign="middle">";
echo"   <td>";
echo"   <tablecellpadding="10"cellspacing="0"border="0"width="80%"align="center"style="font-family:Verdana,Tahoma;color:#666666;font-size:11px">";
echo"   <tr>";
echo"     <tdvalign="middle"align="center"bgcolor="#EBEBEB">";
echo"    <br/><br/><bstyle="font-size:16px">".$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();
}

 
functionajaxshowheader(){
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"<?xmlversion=/"1.0/"encoding=/"$charset/"?>/n<root><![CDATA[";
}

functionajaxshowfooter(){
echo"]]></root>";
}

?>

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