dedecms万能安全防护代码 织梦系统如何进行安全设置

//禁止用户提交某些特殊变量

$ckvs = Array('_GET','_POST','_COOKIE','_FILES');

foreach($ckvs as $ckv){

  if(is_array($$ckv)){

    foreach($$ckv AS $key => $value)

      if(eregi("^(cfg_|globals)",$key)) unset(${$ckv}[$key]);

  }

}

//把get、post、cookie里的<? 替换成 <?

$ckvs = Array('_GET','_POST','_COOKIE');

foreach($ckvs as $ckv){

  if(is_array($$ckv)){

    foreach($$ckv AS $key => $value)

      if(!empty($value)){

        ${$ckv}[$key] = str_replace('<'.'?','&'.'lt;'.'?',$value);

        ${$ckv}[$key] = str_replace('?'.'>','?'.'&'.'gt;',${$ckv}[$key]);

      }

      if(eregi("^cfg_|globals",$key)) unset(${$ckv}[$key]);

  }

}

//检测上传的文件中是否有PHP代码，有直接退出处理

if (is_array($_FILES)) {

foreach($_FILES AS $name => $value){

  ${$name} = $value['tmp_name'];

  $fp = @fopen(${$name},'r');

  $fstr = @fread($fp,filesize(${$name}));

  @fclose($fp);

  if($fstr!='' && ereg("<\?",$fstr)){

      echo "你上传的文件中含有危险内容，程序终止处理！";

      exit();

  }

}

}