2 /************************************************************************
3 * Mailer v0.2.1-FINAL 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 * -------------------------------------------------------------------- *
18 * Copyright (c) 2003 - 2009 by Roland Haeder *
19 * Copyright (c) 2009, 2010 by Mailer Developer Team *
20 * For more information visit: http://www.mxchange.org *
22 * This program is free software; you can redistribute it and/or modify *
23 * it under the terms of the GNU General Public License as published by *
24 * the Free Software Foundation; either version 2 of the License, or *
25 * (at your option) any later version. *
27 * This program is distributed in the hope that it will be useful, *
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
30 * GNU General Public License for more details. *
32 * You should have received a copy of the GNU General Public License *
33 * along with this program; if not, write to the Free Software *
34 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
36 ************************************************************************/
38 // Run only once this security check/replacement
39 if (defined('__SECURITY')) return;
41 // Some security stuff...
42 if (strpos($_SERVER['PHP_SELF'], basename(__FILE__)) !== false) {
46 // Include ctracker, recommended place!
47 //require_once('ctracker.php');
50 * Function to secure input strings
52 * @param $str The unsecured string
53 * @param $strip Strip tags
54 * @return $str A (hopefully) secured string against XSS and other bad things
56 function secureString ($str, $strip = true, $encode = false) {
57 // Shall we strip HTML code?
58 if ($strip === true) $str = strip_tags($str);
63 // Encode in entities if requested
64 if ($encode === true) {
65 // Encode in entities (this breakes UTF-8!)
66 $str = htmlentities($str, ENT_QUOTES);
74 * Secures $_SERVER['PHP_SELF'] against attacks
78 function securePhpSelf () {
80 if (isset($GLOBALS['php_self_secured'])) {
81 // Please do not call this twice!
82 die('PHP_SELF is already secured. Please do not call ' . __FUNCTION__ . ' for your self.');
86 $_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
88 // Split it up into path and filename
89 $phpSelfDirectory = dirname($_SERVER['PHP_SELF']);
90 $phpSelfFile = basename($_SERVER['PHP_SELF']);
92 // Check for a .php inside the $phpSelfDirectory...
93 while (strpos($phpSelfDirectory, '.php') !== false) {
94 // Correct the dirname
95 $phpSelfDirectory = substr($phpSelfDirectory, 0, (strpos($phpSelfDirectory, '.php') + 4));
96 // Rewrite filename...
97 $phpSelfFile = basename($phpSelfDirectory);
99 $phpSelfDirectory = dirname($phpSelfDirectory);
102 // Put both together again and let's pray it is secured now...
103 $_SERVER['PHP_SELF'] = $phpSelfDirectory . '/' . $phpSelfFile;
106 $GLOBALS['php_self_secured'] = true;
108 // Remove uneccessary variables
109 unset($phpSelfDirectory);
114 * Detects caching in PHP
118 function detectPhpCaching () {
119 // Activate caching or transparent compressing when it is not already done
120 if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), 'Mozilla')))) {
121 if ((extension_loaded('zlib')) && (function_exists('ob_start'))) {
123 $GLOBALS['php_caching'] = 'on';
126 // Extension not loaded or required function is missing
127 $GLOBALS['php_caching'] = '404';
131 $GLOBALS['php_caching'] = 'old';
135 // Runtime/GPC quoting is off now...
136 ini_set('magic_quotes_runtime', false);
137 ini_set('magic_quotes_gpc', false); // This may not work on some systems
139 // Check if important arrays are found and define them if missing
140 if (!isset($_SERVER)) {
142 $_SERVER = $GLOBALS['_SERVER'];
147 $_GET = $GLOBALS['_GET'];
150 if (!isset($_POST)) {
152 $_POST = $GLOBALS['_POST'];
155 // Generate arrays which holds the relevante chars to replace
156 $GLOBALS['security_chars'] = array(
157 // The chars we are looking for...
158 'from' => array('/', '.', "'", '$', '(', ')', '{--', '--}', '{?', '?}', '%', ';', '[', ']', ':', '--'),
159 // ... and we will replace to.
180 // Characters allowed in URLs
182 // Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
183 // rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
184 $GLOBALS['url_chars'] = array(
185 // Search for these secured characters
186 'to' => array('{SLASH}', '{DOT}', '{PER}', '{DBL_DOT}', '{COMMENT}'),
187 // Replace with these characters
188 'from' => array('/', '.', '%', ':', '--')
191 // Overworked security part:
192 if (is_array($_GET)) {
193 foreach ($_GET as $seckey => $secvalue) {
194 if (is_array($secvalue)) {
195 // Throw arrays away...
196 unset($_GET[$seckey]);
198 // Only variables are allowed (non-array) but we secure them all!
199 foreach ($GLOBALS['security_chars']['from'] as $key => $char) {
201 $_GET[$seckey] = str_replace($char , $GLOBALS['security_chars']['to'][$key], $_GET[$seckey]);
204 // Strip all other out
205 $_GET[$seckey] = secureString($_GET[$seckey]);
210 // Detect PHP caching
213 // At last secure the $_SERVER['PHP_SELF'] element
216 // Security system loaded...
217 define('__SECURITY', 1);