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 * 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 * Copyright (c) 2009, 2010 by Mailer Developer Team *
22 * For more information visit: http://www.mxchange.org *
24 * This program is free software; you can redistribute it and/or modify *
25 * it under the terms of the GNU General Public License as published by *
26 * the Free Software Foundation; either version 2 of the License, or *
27 * (at your option) any later version. *
29 * This program is distributed in the hope that it will be useful, *
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
32 * GNU General Public License for more details. *
34 * You should have received a copy of the GNU General Public License *
35 * along with this program; if not, write to the Free Software *
36 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
38 ************************************************************************/
40 // Run only once this security check/replacement
41 if (defined('__SECURITY')) return;
43 // Some security stuff...
44 if (strpos($_SERVER['PHP_SELF'], basename(__FILE__)) !== false) {
49 * Function to secure input strings
51 * @param $str The unsecured string
52 * @param $strip Strip tags
53 * @return $str A (hopefully) secured string against XSS and other bad things
55 function secureString ($str, $strip = true, $encode = false) {
56 // Shall we strip HTML code?
57 if ($strip === true) $str = strip_tags($str);
62 // Encode in entities if requested
63 if ($encode === true) {
64 // Encode in entities (this breakes UTF-8!)
65 $str = htmlentities($str, ENT_QUOTES);
73 * Secures $_SERVER['PHP_SELF'] against attacks
77 function securePhpSelf () {
79 if (isset($GLOBALS['php_self_secured'])) {
80 // Please do not call this twice!
81 die('PHP_SELF is already secured. Please do not call ' . __FUNCTION__ . ' for your self.');
85 $_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
87 // Split it up into path and filename
88 $phpSelfDirectory = dirname($_SERVER['PHP_SELF']);
89 $phpSelfFile = basename($_SERVER['PHP_SELF']);
91 // Check for a .php inside the $phpSelfDirectory...
92 while (strpos($phpSelfDirectory, '.php') !== false) {
93 // Correct the dirname
94 $phpSelfDirectory = substr($phpSelfDirectory, 0, (strpos($phpSelfDirectory, '.php') + 4));
95 // Rewrite filename...
96 $phpSelfFile = basename($phpSelfDirectory);
98 $phpSelfDirectory = dirname($phpSelfDirectory);
101 // Put both together again and let's pray it is secured now...
102 $_SERVER['PHP_SELF'] = $phpSelfDirectory . '/' . $phpSelfFile;
105 $GLOBALS['php_self_secured'] = true;
107 // Remove uneccessary variables
108 unset($phpSelfDirectory);
113 * Detects caching in PHP
117 function detectPhpCaching () {
118 // Activate caching or transparent compressing when it is not already done
119 if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), 'Mozilla')))) {
120 if ((extension_loaded('zlib')) && (function_exists('ob_start'))) {
122 $GLOBALS['php_caching'] = 'on';
125 // Extension not loaded or required function is missing
126 $GLOBALS['php_caching'] = '404';
130 $GLOBALS['php_caching'] = 'old';
134 // Runtime/GPC quoting is off now...
135 ini_set('magic_quotes_runtime', false);
136 ini_set('magic_quotes_gpc', false); // This may not work on some systems
138 // Check if important arrays are found and define them if missing
139 if (!isset($_SERVER)) {
141 $_SERVER = $GLOBALS['_SERVER'];
146 $_GET = $GLOBALS['_GET'];
149 if (!isset($_POST)) {
151 $_POST = $GLOBALS['_POST'];
154 // Include IP-Filter here
155 //include("/usr/share/php/ipfilter.php");
157 // Generate arrays which holds the relevante chars to replace
158 $GLOBALS['security_chars'] = array(
159 // The chars we are looking for...
160 'from' => array('{', '}', '/', '.', "'", '$', '(', ')', '{--', '--}', '{?', '?}', '%', ';', '[', ']', ':', '--'),
161 // ... and we will replace to.
184 // Characters allowed in URLs
186 // Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
187 // rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
188 $GLOBALS['url_chars'] = array(
189 // Search for these secured characters
190 'to' => array('{SLASH}', '{DOT}', '{PER}', '{DBL_DOT}', '{COMMENT}'),
191 // Replace with these characters
192 'from' => array('/', '.', '%', ':', '--')
195 // Overworked security part:
196 if (is_array($_GET)) {
197 foreach ($_GET as $seckey => $secvalue) {
198 if (is_array($secvalue)) {
199 // Throw arrays away...
200 unset($_GET[$seckey]);
202 // Only variables are allowed (non-array) but we secure them all!
203 foreach ($GLOBALS['security_chars']['from'] as $key => $char) {
205 $_GET[$seckey] = str_replace($char , $GLOBALS['security_chars']['to'][$key], $_GET[$seckey]);
208 // Strip all other out
209 $_GET[$seckey] = secureString($_GET[$seckey]);
214 // Detect PHP caching
217 // At last secure the $_SERVER['PHP_SELF'] element
220 // Security system loaded...
221 define('__SECURITY', 1);