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 // Unregister all global variables because of vultures and surpress failed attemps
64 @import_request_variables('');
66 // Error reporting level
67 @error_reporting(E_ALL | E_STRICT);
69 // Check if important arrays are found and define them if missing
73 $_SERVER = $GLOBALS['_SERVER'];
78 $_GET = $GLOBALS['_GET'];
83 $_POST = $GLOBALS['_POST'];
88 $_COOKIE = $GLOBALS['_COOKIE'];
91 // Include IP-Filter here
92 //require("/usr/share/php/ipfilter.php");
94 // Generate arrays which holds the relevante chars to replace
95 global $SEC_CHARS, $URL_CHARS;
97 // The chars we are looking for...
98 'from' => array("{", "}", "/", ".", "'", "$", "(", ")", "{--", "--}", "%", ";", "[", "]", ":", "--"),
99 // ... and we will replace to.
120 // Characters allowed in URLs
122 // Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
123 // rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
125 // Search for these secured characters
126 'to' => array("{SLASH}", "{DOT}", "{PER}", "{DBL_DOT}", "{COMMENT}"),
127 // Replace with these characters
128 'from' => array("/", ".", "%", ":", "--")
131 // Overworked security part:
132 if (is_array($_GET)) {
133 foreach ($_GET as $seckey=>$secvalue)
135 if (is_array($secvalue))
137 // Throw arrays away...
138 unset($_GET[$seckey]);
142 // Only variables are allowed (non-array) but we secure them all!
143 foreach ($SEC_CHARS['from'] as $key=>$char)
146 $_GET[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_GET[$seckey]);
149 // Strip all other out
150 $_GET[$seckey] = strip_tags($_GET[$seckey]);
155 if (basename($_SERVER['PHP_SELF']) != "install.php")
158 foreach ($_POST as $seckey=>$secvalue)
160 if (!is_array($secvalue))
162 // Only variables are allowed (non-array) to be secured...
163 foreach ($SEC_CHARS['from'] as $key=>$char)
166 $_POST[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_POST[$seckey]);
169 // Strip all other out
170 $_POST[$seckey] = strip_tags($_POST[$seckey]);
174 // ... and finally cookies
175 foreach ($_COOKIE as $seckey=>$secvalue)
177 if (is_array($secvalue))
179 // Throw arrays away...
180 unset($_COOKIE[$seckey]);
184 // Only variables are allowed (non-array) but we secure them all!
185 foreach ($SEC_CHARS['from'] as $key=>$char)
188 $_COOKIE[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_COOKIE[$seckey]);
191 // Strip all other out
192 $_COOKIE[$seckey] = strip_tags($_COOKIE[$seckey]);
197 // Activate caching or transparent compressing when it is not already done
198 if (!defined('_OB_CACHING'))
200 if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), "Mozilla"))))
202 if ((extension_loaded('zlib')) && (function_exists('ob_start')))
205 define('_OB_CACHING', "on");
210 // Extension not loaded or required function is missing
211 define('_OB_CACHING', "404");
217 define('_OB_CACHING', "old");
221 // At last secure the $_SERVER['PHP_SELF'] element
222 $_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
224 // Split it up into path and filename
225 $SELF_DIR = dirname($_SERVER['PHP_SELF']);
226 $SELF_FILE = basename($_SERVER['PHP_SELF']);
228 // Check for a .php inside the $SELF_DIR...
229 while (ereg(".php", $SELF_DIR))
231 // Correct the dirname
232 $SELF_DIR = substr($SELF_DIR, 0, (strpos($SELF_DIR, ".php") + 4));
233 // Rewrite filename...
234 $SELF_FILE = basename($SELF_DIR);
236 $SELF_DIR = dirname($SELF_DIR);
239 // Put both together again and let's pray it is secured now...
240 $_SERVER['PHP_SELF'] = $SELF_DIR."/".$SELF_FILE;
242 // Remove uneccessary variables
246 // Security system loaded...
247 define('__SECURITY', "1");