Funciones de seguridad PHP

[panchompc]

Un grano de arena para este subforo :D

 

function RemoveXSS($val) { 
	//PASAR STRING A SANEAR
   $val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val); 
    
   $search = 'abcdefghijklmnopqrstuvwxyz'; 
   $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
   $search .= '1234567890!@#$%^&*()'; 
   $search .= '~`";:?+/={}[]-_|\'\\'; 
   for ($i = 0; $i < strlen($search); $i++) { 

      $val = preg_replace('/([xX]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); 
      $val = preg_replace('/({0,8}'.ord($search[$i]).';?)/', $search[$i], $val);
   } 
    
   $ra1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base'); 
   $ra2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload'); 
   $ra = array_merge($ra1, $ra2); 
    
   $found = true; 
   while ($found == true) { 
      $val_before = $val; 
      for ($i = 0; $i < sizeof($ra); $i++) { 
         $pattern = '/'; 
         for ($j = 0; $j < strlen($ra[$i]); $j++) { 
            if ($j > 0) { 
               $pattern .= '('; 
               $pattern .= '([xX]0{0,8}([9ab]);)'; 
               $pattern .= '|'; 
               $pattern .= '|({0,8}([9|10|13]);)'; 
               $pattern .= ')*'; 
            } 
            $pattern .= $ra[$i][$j]; 
         }
		  
         $pattern .= '/i'; 
         $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2);
         $val = preg_replace($pattern, $replacement, $val);
         if ($val_before == $val) { 
            $found = false; 
         } 
      } 
   } 
   
   return $val; 
}


function MysqlEscape($val){
	//FUNCIONA SOLO CON MYSQL, PASAR VARIABLE A SANEAR         
    if(get_magic_quotes_gpc() != 0) {   
        $val = stripslashes($val);
	} 
			
    return mysql_real_escape_string($val); 
}

function Quitar($val){ 
	//PASAR VARIABLE A SANEAR
    $nopermitidos		= array("'",'\\','<','>',"\"",";","$","%","&","/","|","{","}","[","]","+","#"); 
    $val		 		= str_replace($nopermitidos, "", $val); 
	
    return $val; 
}

 

 

Y recuerden trabajar con mysqli, es mas seguro y mas bkn :D