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XssFilter.class.php
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XssFilter.class.php
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<?php
/*
* feindura - Flat File Content Management System
* Copyright (C) Fabian Vogelsteller [frozeman.de]
*
* This program is free software;
* you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with this program;
* if not,see <http://www.gnu.org/licenses/>.
*/
/**
* This file contains the {@link XssFilter} class.
*
* @package [Implementation]-[Backend]
*
*/
/**
* <b>Classname</b> XssFilter<br>
*
* Provides a set of filters, to filter data from possible xss attacks
* based on the PHP Secure Class to prevent XSS Attacks from {@link http://www.webkami.com/programming/php/php-secure-class-to-avoid-xss/php-secure-class-to-avoid-xss-1-0-2.php},
* but it's a complete rewrite.
*
* <b>Note</b>: this class will be used by the implementation classes AND the backend of the feindura-CMS.
*
* @package [Implementation]-[Backend]
*
* @author Fabian Vogelsteller
*
* @since feindura version 1.1
*
* @version 0.1.3
* <br>
* <b>ChangeLog</b><br>
* - 0.1.3 replaced alphaNumeric xss filters with stringStrict filter
* - 0.1.2 change to static class
* - 0.1.1 changed to preg_match_all
* - 0.1 initial release
*
*/
class XssFilter {
/* ---------------------------------------------------------------------------------------------------------------------------- */
/* *** CONSTRUCTOR *** */
/* **************************************************************************************************************************** */
/**
* <b> Type</b> constructor<br>
*
* Constructor is not callable, {@link XssFilter::init()} is used instead.
*
* @return void
*
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
private function __construct() {
}
/* ---------------------------------------------------------------------------------------------------------------------------- */
/* *** METHODS *** */
/* **************************************************************************************************************************** */
/**
* <b>Name</b> escapeBasics()<br>
*
* Escapes basic chars like \ and ' .
*
* @param array $array the data to escape the \ and '
*
* @return string the escaped string
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function escapeBasics($array) {
if(is_array($array)) {
foreach($array as $key => &$value)
if(is_array($value)) $value = self::escapeBasics($value);
else {
if(is_bool($value) || is_numeric($value))
$array[$key] = $value;
else {
$value = GeneralFunctions::smartStripslashes($value);
$value = addslashes($value);
$value = str_replace('\"','"',$value);
$array[$key] = $value;
}
}
}
return $array;
}
/**
* <b>Name</b> bool()<br>
*
* Check if the data is a boolean.
*
* @param bool|string $data the data to check against
* @param bool $returnAsString (optional) if TRUE it returns the bool as a string like: "true" or "false"
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return bool the right boolean, otherwise $default
*
* @static
* @version 1.0.1
* <br>
* <b>ChangeLog</b><br>
* - 1.0.1 fixed checking and returning string
* - 1.0 initial release
*
*/
public static function bool($data, $returnAsString = false ,$default = false) {
if(is_bool($data)) {
if($data)
return ($returnAsString) ? 'true' : true;
else
return ($returnAsString) ? 'false' : false;
} elseif(isset($data) && !empty($data) && (strtolower($data) == 'true' || $data == '1'))
return ($returnAsString) ? 'true' : true;
elseif(!isset($data) || empty($data) || strtolower($data) == 'false' || $data == '0')
return ($returnAsString) ? 'false' : false;
else {
if($default)
return ($returnAsString) ? 'true' : true;
else
return ($returnAsString) ? 'false' : false;
}
}
/**
* <b>Name</b> number()<br>
*
* Check if the data is a number.
*
* @param int $data the data to check against
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return int the integer, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function number($data, $default = 0) {
if(!empty($data) || $data == 0)
return (is_numeric($data)) ? $data : $default;
else
return $default;
}
/**
* <b>Name</b> int()<br>
*
* Check if the data is a integer.
*
* @param int $data the data to check against
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return int the integer, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function int($data, $default = 0) {
if(!empty($data) || $data == 0)
return (is_numeric($data)) ? (int)$data : $default;
else
return $default;
}
/**
* <b>Name</b> float()<br>
*
* Check if the data is a float.
*
* @param number $data the data to check against
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return number the integer, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function float($data, $default = 0) {
if(!empty($data) || $data == 0)
return (is_numeric($data)) ? (float)$data : $default;
else
return $default;
}
/**
* <b>Name</b> alphaOrNumeric()<br>
*
* Check if the data is alphanumeric string with some special chars.
* Allowed chars are:
* - ()
* - []
* - '
* - ,
* - .
* - $
* - &
* - £
* - @
* - ?
* - #
* - _
* - -
*
* <samp>
* Test-Name 123
* </sample>
*
* @param string $data the data to check against
* @param string|null $addChars (optional) a string with allowed characters (they are implemented in a regex so some chars have to be escaped like: "\$")
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return string|number|null an alphabetical string or number, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function string($data, $addChars = null, $default = false) {
if(!empty($data) || $data == 0) {
// start with aplhabetic, may include space, end with alhabetic
preg_match_all("/^['.$addChars.'\(\)\[\]\/\,\.\'\-\$\&\£\s@\?#_a-zA-Z\d]+$/i",$data,$find);
// if you have caught something return it
if(!empty($find[0])) return implode('',$find[0]);
}
return $default;
}
/**
* <b>Name</b> stringStrict()<br>
*
* Check if the data is a alphanumerical string, allowing only underscores "_" and spaces.
*
* <samp>
* Product_With_Color 123
* </sample>
*
* @param string $data the data to check against
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return string|null an alphanumerical string allowing underscores and spaces, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function stringStrict($data, $default = false) {
if(!empty($data) || $data == 0) {
preg_match_all("#^[A-Za-z0-9]([A-Za-z0-9\s_]*[A-Za-z0-9])*$#i",$data,$find);
if(!empty($find[0])) return implode('',$find[0]);
}
return $default;
}
/**
* <b>Name</b> alphabetical()<br>
*
* Check if the data is a alphabetical string.
*
* @param string $data the data to check against
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return string|null an alphabetical string, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function alphabetical($data, $default = false) {
if(!empty($data)) {
preg_match_all("#^[A-Za-z]+$#i",$data,$find); //check strictly there is one alphabetic at least
if(!empty($find[0])) return implode('',$find[0]);
}
return $default;
}
/**
* <b>Name</b> filename()<br>
*
* Check if the data is filename string.
*
* <samp>
* file_n-am e1.php
* </sample>
*
* @param string $data the data to check against
* @param bool $encode (optional) tell if the filename should be urlencoded before
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return int|false a filename string, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function filename($data, $encode = false, $default = false){
if(!empty($data) || $data == 0) {
$data = ($encode) ? urlencode($data) : $data;
preg_match_all("/^[\.\-\s#_a-zA-Z\d]+$/i",$data,$find);
if(!empty($find[0])) return implode('',$find[0]);
}
return $default;
}
/**
* <b>Name</b> path()<br>
*
* Check if the data is local path string.
* The path cannot have ".." .
*
* <samp>
* /path/to/example/file.php
* </sample>
*
* @param int $data the data to check against
* @param bool $encode (optional) whether the path should be urlencoded before
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return int|false a path string, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function path($data, $encode = false, $default = false){
if(!empty($data) || $data == 0) {
preg_match("#^[~\:\\\/\.\-\s_a-zA-Z\d]*$#i",$data,$find);
if (!empty($find[0])) {
preg_match("#\.\.#",$find[0],$findCatch); // disallow ".."
$data = preg_replace('#/+#','/',$find[0]);
if(!empty($findCatch))
return $default;
else
return ($encode) ? urlencode($data) : $data;
}
}
return $default;
}
/**
* <b>Name</b> url()<br>
*
* Check if the data is a URL.
* The path cannot have ".." .
*
* <samp>
* http://path/to/example/file.php?var=value
* </sample>
*
* @param int $data the data to check against
* @param bool $encode (optional) whether the path should be urlencoded before
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return int|false a path string, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function url($data, $encode = false, $default = false){
if(!empty($data) || $data == 0) {
preg_match("#^[a-zA-Z]+[:]{1}[\/\/]{2}[A-Za-z0-9ßöäüÖÄÜ\-_]+\.*[\+\[\]A-Za-z0-9\.\/|:%&\#\=\?\-_]+$#iu",$data,$find);
if (!empty($find[0])) {
preg_match("#\.\.#",$find[0],$findCatch); // disallow ".."
$data = preg_replace('#/{2,}#','//',$find[0]);
if(!empty($findCatch))
return $default;
else
return ($encode) ? urlencode($data) : $data;
}
}
return $default;
}
/**
* <b>Name</b> text()<br>
*
* Change the HTML important signs to htmlspecialchars with the htmlspecialchars() function.
*
* <samp>
* Text <a href="test"> other text
* </samp>
*
* @param string $data the data to check against
* @param string $charset (optional) the charset used by the htmlspecialchars public static function
* @param mixed $default (optional) the default value return if the $data parameter couldn't be validated
*
* @return string|null an alphanumerical string allowing underscores and spaces, otherwise FALSE
*
* @static
* @version 1.0
* <br>
* <b>ChangeLog</b><br>
* - 1.0 initial release
*
*/
public static function text($data, $charset = 'UTF-8' ,$default = false) {
if(!empty($data) || $data == 0) {
//$data = htmlspecialchars_decode($data,ENT_QUOTES);
//$data = str_replace(';',';',$data);
//$data = htmlspecialchars($data,ENT_QUOTES,$charset);
//$data = str_replace(array('&#59;','\\','=','\''),array(';','\','=','''),$data);
$data = str_replace(array(
'>',
'<',
'=',
':',
"\'",
"'",
'"',
//"\\"
),array(
'>',
'<',
'=',
':',
''',
''',
'"',
//'\'
),$data);
//$data = preg_replace('#(\&\#92\;)+#','\',$data);
return $data;
}
return $default;
}
}
?>