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 * -------------------------------------------------------------------- *
14 * -------------------------------------------------------------------- *
15 * Copyright (c) 2003 - 2008 by Roland Haeder *
16 * For more information visit: http://www.mxchange.org *
18 * This program is free software; you can redistribute it and/or modify *
19 * it under the terms of the GNU General Public License as published by *
20 * the Free Software Foundation; either version 2 of the License, or *
21 * (at your option) any later version. *
23 * This program is distributed in the hope that it will be useful, *
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
26 * GNU General Public License for more details. *
28 * You should have received a copy of the GNU General Public License *
29 * along with this program; if not, write to the Free Software *
30 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
32 ************************************************************************/
34 // Some security stuff...
35 if (ereg(basename(__FILE__), $_SERVER['PHP_SELF']))
37 $INC = substr(dirname(__FILE__), 0, strpos(dirname(__FILE__), "/inc") + 4) . "/security.php";
42 * Function to secure input strings
44 * @param $str The unsecured string
45 * @return $str A (hopefully) secured string against HTML and other things
47 function secureString ($str) {
48 $str = trim(strip_tags($str));
49 $str = htmlentities($str, ENT_QUOTES);
53 // Run only once this security check/exchange
54 if (defined('__SECURITY')) return;
56 // Fatal messages goes here
60 // Runtime quoting is off now...
61 set_magic_quotes_runtime(false);
63 // Check if important arrays are found and define them if missing
67 $_SERVER = $GLOBALS['_SERVER'];
72 $_GET = $GLOBALS['_GET'];
77 $_POST = $GLOBALS['_POST'];
79 if (!isset($_SESSION))
82 $_SESSION = $GLOBALS['_COOKIE'];
85 // Include IP-Filter here
86 //require("/usr/share/php/ipfilter.php");
88 // Generate arrays which holds the relevante chars to replace
89 global $SEC_CHARS, $URL_CHARS;
91 // The chars we are looking for...
92 'from' => array("{", "}", "/", ".", "'", "$", "(", ")", "{--", "--}", "%", ";", "[", "]", ":", "--"),
93 // ... and we will replace to.
114 // Characters allowed in URLs
116 // Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
117 // rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
119 // Search for these secured characters
120 'to' => array("{SLASH}", "{DOT}", "{PER}", "{DBL_DOT}", "{COMMENT}"),
121 // Replace with these characters
122 'from' => array("/", ".", "%", ":", "--")
125 // Overworked security part:
126 if (is_array($_GET)) {
127 foreach ($_GET as $seckey=>$secvalue)
129 if (is_array($secvalue))
131 // Throw arrays away...
132 unset($_GET[$seckey]);
136 // Only variables are allowed (non-array) but we secure them all!
137 foreach ($SEC_CHARS['from'] as $key=>$char)
140 $_GET[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_GET[$seckey]);
143 // Strip all other out
144 $_GET[$seckey] = strip_tags($_GET[$seckey]);
149 if (basename($_SERVER['PHP_SELF']) != "install.php")
152 foreach ($_POST as $seckey=>$secvalue)
154 if (!is_array($secvalue))
156 // Only variables are allowed (non-array) to be secured...
157 foreach ($SEC_CHARS['from'] as $key=>$char)
160 $_POST[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_POST[$seckey]);
163 // Strip all other out
164 $_POST[$seckey] = strip_tags($_POST[$seckey]);
168 // ... and finally cookies
169 foreach ($_SESSION as $seckey=>$secvalue)
171 if (is_array($secvalue))
173 // Throw arrays away...
174 unset($_SESSION[$seckey]);
178 // Only variables are allowed (non-array) but we secure them all!
179 foreach ($SEC_CHARS['from'] as $key=>$char)
182 $_SESSION[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_SESSION[$seckey]);
185 // Strip all other out
186 $_SESSION[$seckey] = strip_tags($_SESSION[$seckey]);
191 // Activate caching or transparent compressing when it is not already done
192 if (!defined('_OB_CACHING'))
194 if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), "Mozilla"))))
196 if ((extension_loaded('zlib')) && (function_exists('ob_start')))
199 define('_OB_CACHING', "on");
204 // Extension not loaded or required function is missing
205 define('_OB_CACHING', "404");
211 define('_OB_CACHING', "old");
215 // At last secure the $_SERVER['PHP_SELF'] element
216 $_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
218 // Split it up into path and filename
219 $SELF_DIR = dirname($_SERVER['PHP_SELF']);
220 $SELF_FILE = basename($_SERVER['PHP_SELF']);
222 // Check for a .php inside the $SELF_DIR...
223 while (ereg(".php", $SELF_DIR))
225 // Correct the dirname
226 $SELF_DIR = substr($SELF_DIR, 0, (strpos($SELF_DIR, ".php") + 4));
227 // Rewrite filename...
228 $SELF_FILE = basename($SELF_DIR);
230 $SELF_DIR = dirname($SELF_DIR);
233 // Put both together again and let's pray it is secured now...
234 $_SERVER['PHP_SELF'] = $SELF_DIR."/".$SELF_FILE;
236 // Remove uneccessary variables
240 // Security system loaded...
241 define('__SECURITY', "1");