2 /************************************************************************
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3 * MXChange v0.2.1 Start: 09/20/2005 *
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4 * =============== Last change: 09/20/2005 *
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6 * -------------------------------------------------------------------- *
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7 * File : security_functions.php *
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8 * -------------------------------------------------------------------- *
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9 * Short description : Secure all GET, POST and COOKIE data *
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10 * -------------------------------------------------------------------- *
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11 * Kurzbeschreibung : Alle GET, POST und COOKIE-Daten sichern *
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12 * -------------------------------------------------------------------- *
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14 * -------------------------------------------------------------------- *
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15 * Copyright (c) 2003 - 2008 by Roland Haeder *
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16 * For more information visit: http://www.mxchange.org *
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18 * This program is free software; you can redistribute it and/or modify *
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19 * it under the terms of the GNU General Public License as published by *
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20 * the Free Software Foundation; either version 2 of the License, or *
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21 * (at your option) any later version. *
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23 * This program is distributed in the hope that it will be useful, *
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24 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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26 * GNU General Public License for more details. *
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28 * You should have received a copy of the GNU General Public License *
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29 * along with this program; if not, write to the Free Software *
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30 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
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31 * MA 02110-1301 USA *
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32 ************************************************************************/
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34 // Some security stuff...
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35 if (ereg(basename(__FILE__), $_SERVER['PHP_SELF']))
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37 $INC = substr(dirname(__FILE__), 0, strpos(dirname(__FILE__), "/inc") + 4) . "/security.php";
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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
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54 if (defined('__SECURITY')) return;
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56 // Fatal messages goes here
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60 // Runtime quoting is off now...
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61 set_magic_quotes_runtime(false);
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63 // Unregister all global variables because of vultures and surpress failed attemps
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64 @import_request_variables('');
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66 // Error reporting level
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67 @error_reporting(E_ALL | E_STRICT);
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69 // Check if important arrays are found and define them if missing
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70 if (!isset($_SERVER))
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73 $_SERVER = $GLOBALS['_SERVER'];
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78 $_GET = $GLOBALS['_GET'];
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83 $_POST = $GLOBALS['_POST'];
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85 if (!isset($_COOKIE))
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88 $_COOKIE = $GLOBALS['_COOKIE'];
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91 // Include IP-Filter here
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92 //require("/usr/share/php/ipfilter.php");
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94 // Generate arrays which holds the relevante chars to replace
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95 global $SEC_CHARS, $URL_CHARS;
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97 // The chars we are looking for...
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98 'from' => array("{", "}", "/", ".", "'", "$", "(", ")", "{--", "--}", "%", ";", "[", "]", ":", "--"),
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99 // ... and we will replace to.
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110 "{CLOSE_TEMPLATE}",
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120 // Characters allowed in URLs
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122 // Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
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123 // rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
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124 $URL_CHARS = array(
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125 // Search for these secured characters
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126 'to' => array("{SLASH}", "{DOT}", "{PER}", "{DBL_DOT}", "{COMMENT}"),
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127 // Replace with these characters
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128 'from' => array("/", ".", "%", ":", "--")
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131 // Overworked security part:
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132 if (is_array($_GET)) {
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133 foreach ($_GET as $seckey=>$secvalue)
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135 if (is_array($secvalue))
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137 // Throw arrays away...
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138 unset($_GET[$seckey]);
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142 // Only variables are allowed (non-array) but we secure them all!
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143 foreach ($SEC_CHARS['from'] as $key=>$char)
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145 // Pass all through
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146 $_GET[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_GET[$seckey]);
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149 // Strip all other out
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150 $_GET[$seckey] = strip_tags($_GET[$seckey]);
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155 if (basename($_SERVER['PHP_SELF']) != "install.php")
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158 foreach ($_POST as $seckey=>$secvalue)
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160 if (!is_array($secvalue))
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162 // Only variables are allowed (non-array) to be secured...
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163 foreach ($SEC_CHARS['from'] as $key=>$char)
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165 // Pass all through
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166 $_POST[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_POST[$seckey]);
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169 // Strip all other out
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170 $_POST[$seckey] = strip_tags($_POST[$seckey]);
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174 // ... and finally cookies
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175 foreach ($_COOKIE as $seckey=>$secvalue)
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177 if (is_array($secvalue))
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179 // Throw arrays away...
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180 unset($_COOKIE[$seckey]);
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184 // Only variables are allowed (non-array) but we secure them all!
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185 foreach ($SEC_CHARS['from'] as $key=>$char)
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187 // Pass all through
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188 $_COOKIE[$seckey] = str_replace($char , $SEC_CHARS['to'][$key], $_COOKIE[$seckey]);
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191 // Strip all other out
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192 $_COOKIE[$seckey] = strip_tags($_COOKIE[$seckey]);
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197 // Activate caching or transparent compressing when it is not already done
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198 if (!defined('_OB_CACHING'))
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200 if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), "Mozilla"))))
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202 if ((extension_loaded('zlib')) && (function_exists('ob_start')))
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205 define('_OB_CACHING', "on");
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210 // Extension not loaded or required function is missing
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211 define('_OB_CACHING', "404");
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217 define('_OB_CACHING', "old");
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221 // At last secure the $_SERVER['PHP_SELF'] element
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222 $_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
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224 // Split it up into path and filename
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225 $SELF_DIR = dirname($_SERVER['PHP_SELF']);
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226 $SELF_FILE = basename($_SERVER['PHP_SELF']);
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228 // Check for a .php inside the $SELF_DIR...
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229 while (ereg(".php", $SELF_DIR))
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231 // Correct the dirname
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232 $SELF_DIR = substr($SELF_DIR, 0, (strpos($SELF_DIR, ".php") + 4));
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233 // Rewrite filename...
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234 $SELF_FILE = basename($SELF_DIR);
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236 $SELF_DIR = dirname($SELF_DIR);
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239 // Put both together again and let's pray it is secured now...
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240 $_SERVER['PHP_SELF'] = $SELF_DIR."/".$SELF_FILE;
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242 // Remove uneccessary variables
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246 // Security system loaded...
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247 define('__SECURITY', "1");
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