Rev Author Line No. Line
250 kaklik 1 <?php
2 /* $Id: grab_globals.lib.php,v 2.27.2.1 2006/04/11 16:33:33 cybot_tm Exp $ */
3 // vim: expandtab sw=4 ts=4 sts=4:
4  
5  
6 /**
7 * This library grabs the names and values of the variables sent or posted to a
8 * script in the $_* arrays and sets simple globals variables from them. It does
9 * the same work for the $PHP_SELF, $HTTP_ACCEPT_LANGUAGE and
10 * $HTTP_AUTHORIZATION variables.
11 *
12 * loic1 - 2001/25/11: use the new globals arrays defined with php 4.1+
13 */
14  
15 /**
16 * copy values from one array to another, usally from a superglobal into $GLOBALS
17 *
18 * @uses $GLOBALS['_import_blacklist']
19 * @uses preg_replace()
20 * @uses array_keys()
21 * @uses array_unique()
22 * @uses stripslashes()
23 * @param array $array values from
24 * @param array $target values to
25 * @param boolean $sanitize prevent importing key names in $_import_blacklist
26 */
27 function PMA_gpc_extract($array, &$target, $sanitize = true)
28 {
29 if ( ! is_array($array) ) {
30 return false;
31 }
32  
33 if ( $sanitize ) {
34 $valid_variables = preg_replace($GLOBALS['_import_blacklist'], '',
35 array_keys($array));
36 $valid_variables = array_unique($valid_variables);
37 } else {
38 $valid_variables = array_keys($array);
39 }
40  
41 foreach ( $valid_variables as $key ) {
42  
43 if ( strlen($key) === 0 ) {
44 continue;
45 }
46  
47 if ( is_array($array[$key]) ) {
48 // there could be a variable coming from a cookie of
49 // another application, with the same name as this array
50 unset( $target[$key] );
51  
52 PMA_gpc_extract($array[$key], $target[$key], false);
53 } else {
54 $target[$key] = $array[$key];
55 }
56 }
57 return true;
58 }
59  
60  
61 /**
62 * @var array $_import_blacklist variable names that should NEVER be imported
63 * from superglobals
64 */
65 $_import_blacklist = array(
66 '/^cfg$/i', // PMA configuration
67 '/^server$/i', // selected server
68 '/^db$/i', // page to display
69 '/^table$/i', // page to display
70 '/^goto$/i', // page to display
71 '/^back$/i', // the page go back
72 '/^lang$/i', // selected language
73 '/^convcharset$/i', // PMA convert charset
74 '/^collation_connection$/i', //
75 '/^set_theme$/i', //
76 '/^sql_query$/i', // the query to be executed
77 '/^GLOBALS$/i', // the global scope
78 '/^str.*$/i', // PMA localized strings
79 '/^_.*$/i', // PMA does not use variables starting with _ from extern
80 '/^.*\s+.*$/i', // no whitespaces anywhere
81 '/^[0-9]+.*$/i', // numeric variable names
82 //'/^PMA_.*$/i', // other PMA variables
83 );
84  
85 if ( ! empty( $_GET ) ) {
86 PMA_gpc_extract($_GET, $GLOBALS);
87 }
88  
89 if ( ! empty( $_POST ) ) {
90 PMA_gpc_extract($_POST, $GLOBALS);
91 }
92  
93 if ( ! empty( $_FILES ) ) {
94 foreach ( $_FILES AS $name => $value ) {
95 $$name = $value['tmp_name'];
96 ${$name . '_name'} = $value['name'];
97 }
98 unset( $name, $value );
99 }
100  
101 /**
102 * globalize some environment variables
103 */
104 $server_vars = array('PHP_SELF', 'HTTP_ACCEPT_LANGUAGE', 'HTTP_AUTHORIZATION');
105 foreach ( $server_vars as $current ) {
106 // its not important HOW we detect html tags
107 // its more important to prevent XSS
108 // so its not important if we result in an invalid string,
109 // its even better than a XSS capable string
110 if (PMA_getenv($current) && false === strpos(PMA_getenv($current), '<')) {
111 $$current = PMA_getenv($current);
112 // already importet by register_globals?
113 } elseif ( ! isset( $$current ) || false !== strpos($$current, '<') ) {
114 $$current = '';
115 }
116 }
117 unset($server_vars, $current, $_import_blacklist);
118  
119 ?>