/*
* Copyright (c) 2002,2003 Free Software Foundation
* developed under the custody of the
* Open Web Application Security Project
* (http://www.owasp.org)
*
* This file is part of the PHP Filters.
* PHP Filters 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 2 of the License, or
* (at your option) any later version.
*
* PHP Filters 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.
*
* If you are not able to view the LICENSE, which should
* always be possible within a valid and working PHP Filters release,
* please write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* to get a copy of the GNU General Public License or to report a
* possible license violation.
*/
///////////////////////////////////////
// sanitize.inc.php
// Sanitization functions for PHP
// by: Gavin Zuchlinski, Jamie Pratt, Hokkaido
// webpage: http://libox.net
// Last modified: December 21, 2003
//
// Many thanks to those on the webappsec list for helping me improve these functions
///////////////////////////////////////
// Function list:
// sanitize_paranoid_string($string) -- input string, returns string stripped of all non
// alphanumeric
// sanitize_system_string($string) -- input string, returns string stripped of special
// characters
// sanitize_sql_string($string) -- input string, returns string with slashed out quotes
// sanitize_html_string($string) -- input string, returns string with html replacements
// for special characters
// sanitize_int($integer) -- input integer, returns ONLY the integer (no extraneous
// characters
// sanitize_float($float) -- input float, returns ONLY the float (no extraneous
// characters)
// sanitize($input, $flags) -- input any variable, performs sanitization
// functions specified in flags. flags can be bitwise
// combination of PARANOID, SQL, SYSTEM, HTML, INT, FLOAT, LDAP,
// UTF8
//
//
///////////////////////////////////////
//
// 20031121 jp - added defines for magic_quotes and register_globals, added ; to replacements
// in sanitize_sql_string() function, created rudimentary testing pages
// 20031221 gz - added nice_addslashes and changed sanitize_sql_string to use it
//
/////////////////////////////////////////
define("PARANOID", 1);
define("SQL", 2);
define("SYSTEM", 4);
define("HTML", 8);
define("INT", 16);
define("FLOAT", 32);
define("LDAP", 64);
define("UTF8", 128);
// get register_globals ini setting - jp
$register_globals = (bool) ini_get('register_gobals');
if ($register_globals == TRUE) { define("REGISTER_GLOBALS", 1); } else { define("REGISTER_GLOBALS", 0); }
// get magic_quotes_gpc ini setting - jp
$magic_quotes = (bool) ini_get('magic_quotes_gpc');
if ($magic_quotes == TRUE) { define("MAGIC_QUOTES", 1); } else { define("MAGIC_QUOTES", 0); }
// addslashes wrapper to check for gpc_magic_quotes - gz
function nice_addslashes($string)
{
// if magic quotes is on the string is already quoted, just return it
if(MAGIC_QUOTES)
return $string;
else
return addslashes($string);
}
// internal function for utf8 decoding
// thanks to Hokkaido for noticing that PHP's utf8_decode function is a little
// screwy, and to jamie for the code
function my_utf8_decode($string)
{
return strtr($string,
"???????¥µÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ",
"SOZsozYYuAAAAAAACEEEEIIIIDNOOOOOOUUUUYsaaaaaaaceeeeiiiionoooooouuuuyy");
}
// paranoid sanitization -- only let the alphanumeric set through
function sanitize_paranoid_string($string, $min='', $max='')
{
$string = preg_replace("/[^a-zA-Z0-9]/", "", $string);
$len = strlen($string);
if((($min != '') && ($len < $min)) || (($max != '') && ($len > $max)))
return FALSE;
return $string;
}
// sanitize a string in prep for passing a single argument to system() (or similar)
function sanitize_system_string($string, $min='', $max='')
{
$pattern = '/(;|\||`|>|<|&|^|"|'."\n|\r|'".'|{|}|[|]|\)|\()/i'; // no piping, passing possible environment variables ($),
// seperate commands, nested execution, file redirection,
// background processing, special commands (backspace, etc.), quotes
// newlines, or some other special characters
$string = preg_replace($pattern, '', $string);
$string = '"'.preg_replace('/\$/', '\\\$', $string).'"'; //make sure this is only interpretted as ONE argument
$len = strlen($string);
if((($min != '') && ($len < $min)) || (($max != '') && ($len > $max)))
return FALSE;
return $string;
}
// sanitize a string for SQL input (simple slash out quotes and slashes)
function sanitize_sql_string($string, $min='', $max='')
{
$string = nice_addslashes($string); //gz
$pattern = '/;/'; // jp
$replacement = '';
$len = strlen($string);
if((($min != '') && ($len < $min)) || (($max != '') && ($len > $max)))
return FALSE;
return preg_replace($pattern, $replacement, $string);
}
// sanitize a string for SQL input (simple slash out quotes and slashes)
function sanitize_ldap_string($string, $min='', $max='')
{
$pattern = '/(\)|\(|\||&)/';
$len = strlen($string);
if((($min != '') && ($len < $min)) || (($max != '') && ($len > $max)))
return FALSE;
return preg_replace($pattern, '', $string);
}
// sanitize a string for HTML (make sure nothing gets interpretted!)
function sanitize_html_string($string)
{
$pattern[0] = '/\&/';
$pattern[1] = '/';
$pattern[2] = "/>/";
$pattern[3] = '/\n/';
$pattern[4] = '/"/';
$pattern[5] = "/'/";
$pattern[6] = "/%/";
$pattern[7] = '/\(/';
$pattern[8] = '/\)/';
$pattern[9] = '/\+/';
$pattern[10] = '/-/';
$replacement[0] = '&';
$replacement[1] = '<';
$replacement[2] = '>';
$replacement[3] = ' ';
$replacement[4] = '"';
$replacement[5] = ''';
$replacement[6] = '%';
$replacement[7] = '(';
$replacement[8] = ')';
$replacement[9] = '+';
$replacement[10] = '-';
return preg_replace($pattern, $replacement, $string);
}
// make int int!
function sanitize_int($integer, $min='', $max='')
{
$int = intval($integer);
if((($min != '') && ($int < $min)) || (($max != '') && ($int > $max)))
return FALSE;
return $int;
}
// make float float!
function sanitize_float($float, $min='', $max='')
{
$float = floatval($float);
if((($min != '') && ($float < $min)) || (($max != '') && ($float > $max)))
return FALSE;
return $float;
}
// glue together all the other functions
function sanitize($input, $flags, $min='', $max='')
{
if($flags & UTF8) $input = my_utf8_decode($input);
if($flags & PARANOID) $input = sanitize_paranoid_string($input, $min, $max);
if($flags & INT) $input = sanitize_int($input, $min, $max);
if($flags & FLOAT) $input = sanitize_float($input, $min, $max);
if($flags & HTML) $input = sanitize_html_string($input, $min, $max);
if($flags & SQL) $input = sanitize_sql_string($input, $min, $max);
if($flags & LDAP) $input = sanitize_ldap_string($input, $min, $max);
if($flags & SYSTEM) $input = sanitize_system_string($input, $min, $max);
return $input;
}
function check_paranoid_string($input, $min='', $max='')
{
if($input != sanitize_paranoid_string($input, $min, $max))
return FALSE;
return TRUE;
}
function check_int($input, $min='', $max='')
{
if($input != sanitize_int($input, $min, $max))
return FALSE;
return TRUE;
}
function check_float($input, $min='', $max='')
{
if($input != sanitize_float($input, $min, $max))
return FALSE;
return TRUE;
}
function check_html_string($input, $min='', $max='')
{
if($input != sanitize_html_string($input, $min, $max))
return FALSE;
return TRUE;
}
function check_sql_string($input, $min='', $max='')
{
if($input != sanitize_sql_string($input, $min, $max))
return FALSE;
return TRUE;
}
function check_ldap_string($input, $min='', $max='')
{
if($input != sanitize_string($input, $min, $max))
return FALSE;
return TRUE;
}
function check_system_string($input, $min='', $max='')
{
if($input != sanitize_system_string($input, $min, $max, TRUE))
return FALSE;
return TRUE;
}
// glue together all the other functions
function check($input, $flags, $min='', $max='')
{
$oldput = $input;
if($flags & UTF8) $input = my_utf8_decode($input);
if($flags & PARANOID) $input = sanitize_paranoid_string($input, $min, $max);
if($flags & INT) $input = sanitize_int($input, $min, $max);
if($flags & FLOAT) $input = sanitize_float($input, $min, $max);
if($flags & HTML) $input = sanitize_html_string($input, $min, $max);
if($flags & SQL) $input = sanitize_sql_string($input, $min, $max);
if($flags & LDAP) $input = sanitize_ldap_string($input, $min, $max);
if($flags & SYSTEM) $input = sanitize_system_string($input, $min, $max, TRUE);
if($input != $oldput)
return FALSE;
return TRUE;
}
function validateEmail($email) {
return preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9._-]+)+$/" , $email);
}
?>
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