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php 参数过滤、数据过滤详解,php详解

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Release: 2016-06-13 08:52:38
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php 参数过滤、数据过滤详解,php详解

下面通过一段代码给大家介绍php参数过滤

class mysafe{
 public $logname;
 public $isshwomsg;
 function __construct(){ 
  set_error_handler('MyError',E_ALL); 
  //-----
 }
 function MyError($errno, $errstr, $errfile, $errline){  
  echo "<b>Error number:</b> [$errno],error on line $errline in $errfile<br />";
  exit;
 }
 function wlog($logs){
  if(empty($logname)){
   $this->logname=$_SERVER["DOCUMENT_ROOT"]."/log.htm";
  }  
  $Ts=fopen($this->logname,"a+");
  fputs($Ts,$logs."\r\n");
  fclose($Ts);
 }
 function showmsg($msg='',$flag=false){
  $this->isshwomsg=empty($this->isshwomsg) &#63; false : true;
  if ($this->isshwomsg) {
   echo '<br />--------------------------------------<br />';
   echo $msg;
   echo '<br />--------------------------------------<br />';
   if ($flag) exit;
  } 
 }
 function get_filter(){
  $getfilter="'|(and|or)\\b.+&#63;(>|<|=|in|like)|\\/\\*.+&#63;\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+&#63;SELECT|UPDATE.+&#63;SET|INSERT\\s+INTO.+&#63;VALUES|(SELECT|DELETE).+&#63;FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)";
  foreach($_GET as $key=>$value){
   $this->StopAttack($key,$value,$getfilter);
  }
 }
 function post_filter(){
  $postfilter="\\b(and|or)\\b.{1,6}&#63;(=|>|<|\\bin\\b|\\blike\\b)|\\/\\*.+&#63;\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+&#63;SELECT|UPDATE.+&#63;SET|INSERT\\s+INTO.+&#63;VALUES|(SELECT|DELETE).+&#63;FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)";
  foreach($_POST as $key=>$value){
   $this->StopAttack($key,$value,$postfilter);
  }
 }
 function cookie_filter(){
  $cookiefilter="\\b(and|or)\\b.{1,6}&#63;(=|>|<|\\bin\\b|\\blike\\b)|\\/\\*.+&#63;\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+&#63;SELECT|UPDATE.+&#63;SET|INSERT\\s+INTO.+&#63;VALUES|(SELECT|DELETE).+&#63;FROM|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)";
  foreach($_COOKIE as $key=>$value){
   $this->StopAttack($key,$value,$cookiefilter);
  }
 }
 //过滤参数 
 function StopAttack($StrFiltKey,$StrFiltValue,$ArrFiltReq){
  if(is_array($StrFiltValue)){
   $StrFiltValue=implode($StrFiltValue);
  } 
  if (preg_match("/".$ArrFiltReq."/is",$StrFiltValue)==1){
   $msg="<br><br>操作IP: ".$_SERVER["REMOTE_ADDR"]."<br>操作时间: ".strftime("%Y-%m-%d %H:%M:%S")."<br>操作页面:".$_SERVER["PHP_SELF"]."<br>提交方式: ".$_SERVER["REQUEST_METHOD"]."<br>提交参数: ".$StrFiltKey."<br>提交数据: ".$StrFiltValue; 
   $this->wlog($msg);   
   $this->showmsg($msg);   
   exit();
  }  
 }
 function filter_value_for_sql($str){
  $str = str_replace("and","",$str);
  $str = str_replace("execute","",$str);
  $str = str_replace("update","",$str);
  $str = str_replace("count","",$str);
  $str = str_replace("chr","",$str);
  $str = str_replace("mid","",$str);
  $str = str_replace("master","",$str);
  $str = str_replace("truncate","",$str);
  $str = str_replace("char","",$str);
  $str = str_replace("declare","",$str);
  $str = str_replace("select","",$str);
  $str = str_replace("create","",$str);
  $str = str_replace("delete","",$str);
  $str = str_replace("insert","",$str);
  $str = str_replace("'","",$str);
  $str = str_replace('"',"",$str);
  $str = str_replace(" ","",$str);
  $str = str_replace("or","",$str);
  $str = str_replace("=","",$str);
  $str = str_replace(" ","",$str); 
  return $str;
 }
 //class end
}

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下面给大家介绍下PHP数据过滤

1、php提交数据过滤的基本原则

1)提交变量进数据库时,我们必须使用addslashes()进行过滤,像我们的注入问题,一个addslashes()也就搞定了。其实在涉及到变量取值时,intval()函数对字符串的过滤也是个不错的选择。
2)在php.ini中开启magic_quotes_gpc和magic_quotes_runtime。magic_quotes_gpc可以把get,post,cookie里的引号变为斜杠。magic_quotes_runtime对于进出数据库的数据可以起到格式话的作用。其实,早在以前注入很疯狂时,这个参数就很流行了。
3)在使用系统函数时,必须使用escapeshellarg(),escapeshellcmd()参数去过滤,这样你也就可以放心的使用系统函数。
4)对于跨站,strip_tags(),htmlspecialchars()两个参数都不错,对于用户提交的的带有html和php的标记都将进行转换。比如尖括号" $new = htmlspecialchars("Test", ENT_QUOTES);
strip_tags($text,);
5)对于相关函数的过滤,就像先前的include(),unlink,fopen()等等,只要你把你所要执行操作的变量指定好或者对相关字符过滤严密,我想这样也就无懈可击了。

2、PHP简单的数据过滤

1)入库:  trim($str),addslashes($str)
2)出库:  stripslashes($str)
3)显示:  htmlspecialchars(nl2br($str))

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