网站频繁被挂马?做一些改进,基本上能把这个问题解决,因为discuz x等程序存在漏洞,被上传了websehll,每次被删除过段时间又出来了,最终查到所有的木马。
从以下几个方面查找并加强(如果能不开启会员功能,不给任何上传入口,保护好后台密码,加固好PHP,一般就没什么问题了)。
[b]1.根据特征码查找:[/b]
php木马一般含有
[url=scandir.php]
exit;
}
if(emptyempty($log)){
echo "当前还没有创建日志文件!点击[保存当前]创建日志文件!";
}else{
if($file_list==$log){
echo "本文件夹没有做过任何改动!";
}else{
if(count($file_list) > 0 ){
foreach($file_list as $file => $md5){
if(!isset($log[$file])){
echo "新增文件:<a href={$file} target='_blank'>".$file."</a>"." 创建时间:".date("Y-m-d H:i:s",filectime($file))." 修改时间:".date("Y-m-d H:i:s",filemtime($file))." <a href=?readfile={$file} target='_blank'>源码</a><a href='?m=del&filename={$file}' target='_blank'>删除</u></a><br />";
}else{
if($log[$file] != $md5){
echo "修改文件:<a href={$file} target='_blank'>".$file."</a>"." 创建时间:".date("Y-m-d H:i:s",filectime($file))." 修改时间:".date("Y-m-d H:i:s",filemtime($file))." <a href=?readfile={$file} target='_blank'>源码</a><br />";
unset($log[$file]);
}else{
unset($log[$file]);
}
}
}
}
if(count($log)>0){
foreach($log as $file => $md5){
echo "删除文件:<a href={$file} target='_blank'>".$file."</a><br />";
}
}
}
}
}
}
//计算md5
function record_md5($jkdir){
global $file_list,$exclude;
if(is_dir($jkdir)){
$file=scandir($jkdir);
foreach($file as $f){
if($f!='.' && $f!='..' && !in_array($f, $exclude)){
$path = $jkdir.'/'.$f;
if(is_dir($path)){
record_md5($path);
}else{
$file_list[$path]=md5_file($path);
}
}
}
}
}
function Safe_Check($jkdir)//遍历文件
{
global $danger ,$suffix ,$jkdir_num ,$file_num ,$danger_num;
$hand=@dir($jkdir) or die('文件夹不存在') ;
while ($file=$hand->read())
{
$filename=$jkdir.'/'.$file;
if (!$jumpoff) {
if(Jump($filename))continue;
}
if(@is_dir($filename) && $file != '.' && $file!= '..'&& $file!='./..')
{ $jkdir_num++;
Safe_Check($filename);
}
if (preg_match_all ("/\.($suffix)/i",$filename,$out))
{
$str='';
$fp = @fopen($filename,'r')or die('没有权限');
while(!feof($fp))
{
$str .= fgets($fp,1024);
}
fclose($fp);
if( preg_match_all ("/($danger)[ \r\n\t]{0,}([\[\(])/i",$str,$out))
{
echo "<font color='green' style='font-size:14px'>可疑文件:{$filename}</font>"." 创建时间:".date("Y-m-d H:i:s",filectime($filename))." 修改时间:".date("Y-m-d H:i:s",filemtime($filename))." <a href='?readfile={$filename}' target='_blank'><u>查看代码</u></a> <a href='?m=del&filename=$filename' target='_blank'>删除</u></a><br>";
$danger_num++;
}
}
$file_num++;
}
}
function Edit()//查看可疑文件
{
global $filename;
$filename = str_replace("..","",$filename);
$file = $filename;
$content = "";
if(is_file($file))
{
$fp = fopen($file,"r")or die('没有权限');
$content = fread($fp,filesize($file));
fclose($fp);
$content = htmlspecialchars($content);
}
echo "<textarea name='str' style='width:100%;height:450px;background:#cccccc;'>$content</textarea>\r\n";
exit();
}
function Delete()//删除文件
{ global $filename,$pass;
if(emptyempty($_POST['passchack'])){
echo"<form id=\"form1\" name=\"form1\" method=\"post\">"
. " <label>pass"
. " <input type=\"text\" name=\"passchack\" />"
. " </label>"
. " <input type=\"submit\" name=\"Submit\" value=\"提交\" />"
. "</form>"
."";
exit;
}elseif(isset($_POST['passchack'])&&$_POST['passchack']==$pass){
(is_file($filename))?($mes=unlink($filename)?'删除成功':'删除失败 查看权限'):'';
echo $mes;
exit();
}else{
echo '密码错误!';
exit;
}
}
function Jump($file)//跳过文件
{
global $jump,$safearr;
if($jump != '')
{
foreach($safearr as $v)
{
if($v=='') continue;
if( eregi($v,$file) ) return true ;
}
}
return false;
}
?>
<a href="scandir.php">[查看文件改动]</a>|<a href="scandir.php?savethis=1">[保存当前文件指纹]</a>|<a href="scandir.php?check=check">[扫描可疑文件]</a>
执行后能看到最近被修改的文件,具有参加价值
[b]3.修改php.ini,限制以下函数[/b]
disable_functions = phpinfo,passthru,exec,system,chroot,chgrp,chown,shell_exec,proc_open,proc_get_status,ini_alter,ini_alter,ini_restore,dl,pfsockopen,openlog,syslog,readlink,symlink,popepassthru,stream_socket_server,fsocke,popen,proc_close,curl_exec,curl_multi_exec,parse_ini_file,show_source,dl,escapeshellarg,escapeshellcmd
[b]4.修改nginx.conf ,限制一些目录执行php文件[/b]
server
{
listen 80;
server_name www.***.com;
index index.htm index.html index.php;
root /wwwroot/;
rewrite ^([^\.]*)/topic-(.+)\.html$ $1/portal.php?mod=topic&topic=$2 last;
rewrite ^([^\.]*)/article-([0-9]+)-([0-9]+)\.html$ $1/portal.php?mod=view&aid=$2&page=$3 last;
rewrite ^([^\.]*)/forum-(\w+)-([0-9]+)\.html$ $1/forum.php?mod=forumdisplay&fid=$2&page=$3 last;
rewrite ^([^\.]*)/thread-([0-9]+)-([0-9]+)-([0-9]+)\.html$ $1/forum.php?mod=viewthread&tid=$2&extra=page%3D$4&page=$3 last;
rewrite ^([^\.]*)/group-([0-9]+)-([0-9]+)\.html$ $1/forum.php?mod=group&fid=$2&page=$3 last;
rewrite ^([^\.]*)/space-(username|uid)-(.+)\.html$ $1/home.php?mod=space&$2=$3 last;
rewrite ^([^\.]*)/([a-z]+)-(.+)\.html$ $1/$2.php?rewrite=$3 last;
rewrite ^([^\.]*)/topic-(.+)\.html$ $1/portal.php?mod=topic&topic=$2 last;
location ~ ^/images/.*\.(php|php5)$
{
deny all;
}
location ~ ^/static/.*\.(php|php5)$
{
deny all;
}
location ~* ^/data/(attachment|avatar)/.*\.(php|php5)$
{
deny all;
}
location ~ .*\.(php|php5)?$
{
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fcgi.conf;
}
error_page 400 /404.html;
error_page 403 /404.html;
error_page 404 /404.html;
error_page 405 /404.html;
error_page 408 /404.html;
error_page 410 /404.html;
error_page 411 /404.html;
error_page 412 /404.html;
error_page 413 /404.html;
error_page 414 /404.html;
error_page 415 /404.html;
error_page 500 /404.html;
error_page 501 /404.html;
error_page 502 /404.html;
error_page 503 /404.html;
error_page 506 /404.html;
log_format acclog "$remote_addr $request_time $http_x_readtime [$time_local] \"$request_method http://$host$request_uri\" $status $body_bytes_sent \"$http_referer\" \"$http_user_agent\"";
access_log /logs/access.log acclog;
}
此处需要注意的是
location ~ ^/images/.*\.(php|php5)$
{
deny all;
}
这些目录的限制必须写在
location ~ .*\.(php|php5)?$
{
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fcgi.conf;
}
的前面,否则限制不生效。