或者
find /wwwroot/* -type f -name “*.php” |xargs grep “eval(” > /wwwroot/scan.txt
结果就查出很多明显的webshell,并且发现都藏在attachment等目录下
2.利用网上的一个php代码，搜索最近被修改的文件
scandir.php
内容如下：
<?php
set_time_limit(0);//防止超时
/**
*
* php目录扫描监控增强版
*
* @author lssbing (lssbing#gmail.com)
* @date 2010-1-18
* @license BSD
* @version 1.0
*
下面几个变量使用前需要手动设置
*
**/
/*===================== 程序配置 =====================*/
$pass=”12345″;//设置密码
$jkdir=”.”; //设置监控扫描的目录，当前目录为’.’，上一级目录为’..’，也可以设置绝对路径，后面不要加斜杠，默认为当前目录
$logfilename=”./m.log”;//设置存储log的路径，可以放置在任意位置
$exclude=array(‘data’,’images’);//排除目录
$danger=’eval|cmd|passthru|gzuncompress’;//设置要查找的危险的函数 以确定是否木马文件
$suffix=’php|inc’;//设置要扫描文件的后缀
/*===================== 配置结束 =====================*/
$filename=$_GET[‘filename’];
$check=$_GET[‘check’];
$jumpoff=false;
$url = $_SERVER[‘PHP_SELF’];
$thisfile = end(explode(‘/’,$url));
$jump=”{$thisfile}|”.implode(‘|’,$exclude);
$jkdir_num=$file_num=$danger_num=0;
define(‘M_PATH’,$jkdir);
define(‘M_LOG’,$logfilename);
if ($check==’check’)
{
$safearr = explode(“|”,$jump);
$start_time=microtime(true);
safe_check($jkdir);
$end_time=microtime(true);
$total=$end_time-$start_time;
$file_num=$file_num-$jkdir_num;
$message= ” 文件数:”.$file_num;
$message.= ” 文件夹数：”.$jkdir_num;
$message.= ” 可疑文件数：”.$danger_num;
$message.= ” 执行时间：”.$total;
echo $message;
}else{
if ($_GET[‘m’]==”del”) Delete();//处理文件删除
//读取文件内容
if(isset($_GET[‘readfile’])){
//输出查看密码，密码校验正确以后输出文件内容
if(emptyempty($_POST[‘passchack’])){
echo”
. ” ”
. ” ”
. “
”
.””;
exit;
}elseif(isset($_POST[‘passchack’])&&$_POST[‘passchack’]==$pass){
$code=file_get_contents($_GET[‘readfile’]);
echo”“;
exit;
}else{
exit;
}
}else{
record_md5(M_PATH);
if(file_exists(M_LOG)){
$log = unserialize(file_get_contents(M_LOG));
}else{
$log = array();
}
if($_GET[‘savethis’]==1){
//保存当前文件md5到日志文件
@unlink(M_LOG);
file_put_contents(M_LOG,serialize($file_list));
echo “保存成功！点击返回”;
exit;
}
if(emptyempty($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[$file])){
echo “新增文件：”.$file.””.” 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)).” 源码删除
“;
}else{
if($log[$file] != $md5){
echo “修改文件：”.$file.””.” 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)).” 源码
“;
unset($log[$file]);
}else{
unset($log[$file]);
}
}
}
}
if(count($log)>0){
foreach($log as $file => $md5){
echo “删除文件：”.$file.”
“;
}
}
}
}
}
}
//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 “可疑文件：{$filename}”.” 创建时间：”.date(“Y-m-d H:i:s”,filectime($filename)).” 修改时间：”.date(“Y-m-d H:i:s”,filemtime($filename)).” 查看代码 删除
“;
$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 “\r\n”;
exit();
}
function Delete()//删除文件
{ global $filename,$pass;
if(emptyempty($_POST[‘passchack’])){
echo”
. ” ”
. ” ”
. “
”
.””;
exit;
}elseif(isset($_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;
}
?>
[查看文件改动]|[保存当前文件指纹]|[扫描可疑文件]
执行后能看到最近被修改的文件，具有参加价值
3.修改php.ini，限制以下函数
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
4.修改nginx.conf ,限制一些目录执行php文件
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。