2 /************************************************************************
3 * MXChange v0.2.1 Start: 09/20/2005 *
4 * =============== Last change: 09/20/2005 *
6 * -------------------------------------------------------------------- *
7 * File : security_functions.php *
8 * -------------------------------------------------------------------- *
9 * Short description : Secure all GET, POST and COOKIE data *
10 * -------------------------------------------------------------------- *
11 * Kurzbeschreibung : Alle GET, POST und COOKIE-Daten sichern *
12 * -------------------------------------------------------------------- *
15 * $Tag:: 0.2.1-FINAL $ *
17 * Needs to be in all Files and every File needs "svn propset *
18 * svn:keywords Date Revision" (autoprobset!) at least!!!!!! *
19 * -------------------------------------------------------------------- *
20 * Copyright (c) 2003 - 2009 by Roland Haeder *
21 * For more information visit: http://www.mxchange.org *
23 * This program is free software; you can redistribute it and/or modify *
24 * it under the terms of the GNU General Public License as published by *
25 * the Free Software Foundation; either version 2 of the License, or *
26 * (at your option) any later version. *
28 * This program is distributed in the hope that it will be useful, *
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
31 * GNU General Public License for more details. *
33 * You should have received a copy of the GNU General Public License *
34 * along with this program; if not, write to the Free Software *
35 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
37 ************************************************************************/
39 // Run only once this security check/exchange
40 if (defined('__SECURITY')) return;
42 // Some security stuff...
43 if (ereg(basename(__FILE__), $_SERVER['PHP_SELF'])) {
48 * Function to secure input strings
50 * @param $str The unsecured string
51 * @param $strip Strip tags
52 * @return $str A (hopefully) secured string against XSS and other bad things
54 function secureString ($str, $strip = true, $encode = false) {
55 // Shall we strip HTML code?
56 if ($strip === true) $str = strip_tags($str);
61 // Encode in entities if requested
62 if ($encode === true) {
63 // Encode in entities (this breakes UTF-8!)
64 $str = htmlentities($str, ENT_QUOTES);
71 // Runtime/GPC quoting is off now...
72 set_magic_quotes_runtime(false);
73 ini_set('magic_quotes_gpc', false); // This may not work on some systems
75 // Check if important arrays are found and define them if missing
76 if (!isset($_SERVER)) {
78 $_SERVER = $GLOBALS['_SERVER'];
83 $_GET = $GLOBALS['_GET'];
88 $_POST = $GLOBALS['_POST'];
91 // Include IP-Filter here
92 //require("/usr/share/php/ipfilter.php");
94 // Generate arrays which holds the relevante chars to replace
95 $GLOBALS['security_chars'] = array(
96 // The chars we are looking for...
97 'from' => array('{', '}', '/', '.', "'", '$', '(', ')', '{--', '--}', '{?', '?}', '%', ';', '[', ']', ':', '--'),
98 // ... and we will replace to.
121 // Characters allowed in URLs
123 // Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
124 // rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
125 $GLOBALS['url_chars'] = array(
126 // Search for these secured characters
127 'to' => array('{SLASH}', '{DOT}', '{PER}', '{DBL_DOT}', '{COMMENT}'),
128 // Replace with these characters
129 'from' => array('/', '.', '%', ':', '--')
132 // Overworked security part:
133 if (is_array($_GET)) {
134 foreach ($_GET as $seckey => $secvalue) {
135 if (is_array($secvalue)) {
136 // Throw arrays away...
137 unset($_GET[$seckey]);
139 // Only variables are allowed (non-array) but we secure them all!
140 foreach ($GLOBALS['security_chars']['from'] as $key => $char) {
142 $_GET[$seckey] = str_replace($char , $GLOBALS['security_chars']['to'][$key], $_GET[$seckey]);
145 // Strip all other out
146 $_GET[$seckey] = secureString($_GET[$seckey]);
151 // Activate caching or transparent compressing when it is not already done
152 if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), 'Mozilla')))) {
153 if ((extension_loaded('zlib')) && (function_exists('ob_start'))) {
155 $GLOBALS['php_caching'] = 'on';
158 // Extension not loaded or required function is missing
159 $GLOBALS['php_caching'] = '404';
163 $GLOBALS['php_caching'] = 'old';
166 // At last secure the $_SERVER['PHP_SELF'] element
167 $_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
169 // Split it up into path and filename
170 $phpSelfDirectory = dirname($_SERVER['PHP_SELF']);
171 $phpSelfFile = basename($_SERVER['PHP_SELF']);
173 // Check for a .php inside the $phpSelfDirectory...
174 while (ereg('.php', $phpSelfDirectory)) {
175 // Correct the dirname
176 $phpSelfDirectory = substr($phpSelfDirectory, 0, (strpos($phpSelfDirectory, '.php') + 4));
177 // Rewrite filename...
178 $phpSelfFile = basename($phpSelfDirectory);
180 $phpSelfDirectory = dirname($phpSelfDirectory);
183 // Put both together again and let's pray it is secured now...
184 $_SERVER['PHP_SELF'] = $phpSelfDirectory . '/' . $phpSelfFile;
186 // Remove uneccessary variables
187 unset($phpSelfDirectory);
190 // Security system loaded...
191 define('__SECURITY', 1);