e3ff258e16
check/init global required variables like: $lang, $server, $db, $table, $convcharset, $goto introduced $goto-whitelist PEAR coding standard
124 lines
3.8 KiB
PHP
124 lines
3.8 KiB
PHP
<?php
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/* $Id$ */
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// vim: expandtab sw=4 ts=4 sts=4:
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/**
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* This library grabs the names and values of the variables sent or posted to a
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* script in the $_* arrays and sets simple globals variables from them. It does
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* the same work for the $PHP_SELF, $HTTP_ACCEPT_LANGUAGE and
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* $HTTP_AUTHORIZATION variables.
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*
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* loic1 - 2001/25/11: use the new globals arrays defined with php 4.1+
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*/
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/**
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* copy values from one array to another, usally from a superglobal into $GLOBALS
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*
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* @uses $GLOBALS['_import_blacklist']
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* @uses preg_replace()
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* @uses array_keys()
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* @uses array_unique()
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* @uses get_magic_quotes_gpc() to check wether stripslashes or not
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* @uses stripslashes()
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* @param array $array values from
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* @param array $target values to
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* @param boolean $sanitize prevent importing key names in $_import_blacklist
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*/
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function PMA_gpc_extract($array, &$target, $sanitize = true)
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{
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if ( ! is_array($array) ) {
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return false;
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}
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if ( $sanitize ) {
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$valid_variables = preg_replace($GLOBALS['_import_blacklist'], '',
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array_keys($array));
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$valid_variables = array_unique($valid_variables);
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} else {
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$valid_variables = array_keys($array);
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}
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$is_magic_quotes = get_magic_quotes_gpc();
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foreach ( $valid_variables as $key ) {
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if ( strlen($key) === 0 ) {
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continue;
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}
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if ( is_array($array[$key]) ) {
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// there could be a variable coming from a cookie of
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// another application, with the same name as this array
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unset( $target[$key] );
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PMA_gpc_extract($array[$key], $target[$key], false);
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} elseif ( $is_magic_quotes ) {
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$target[$key] = stripslashes($array[$key]);
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} else {
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$target[$key] = $array[$key];
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}
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}
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return true;
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}
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/**
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* @var array $_import_blacklist variable names that should NEVER be imported
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* from superglobals
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*/
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$_import_blacklist = array(
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'/^cfg$/i', // PMA configuration
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'/^db$/i', // page to display
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'/^table$/i', // page to display
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'/^goto$/i', // page to display
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'/^lang$/i', // selected language
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'/^server$/i', // selected server
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'/^convcharset$/i', // PMA convert charset
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'/^collation_connection$/i', //
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'/^set_theme$/i', //
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'/^GLOBALS$/i', // the global scope
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'/^str.*$/i', // PMA localized strings
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'/^_.*$/i', // PMA does not use variables starting with _ from extern
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'/^.*\s+.*$/i', // no whitespaces anywhere
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'/^[0-9]+.*$/i', // numeric variable names
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//'/^PMA_.*$/i', // other PMA variables
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);
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if ( ! empty( $_GET ) ) {
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PMA_gpc_extract($_GET, $GLOBALS);
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}
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if ( ! empty( $_POST ) ) {
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PMA_gpc_extract($_POST, $GLOBALS);
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}
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if ( ! empty( $_FILES ) ) {
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foreach ( $_FILES AS $name => $value ) {
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$$name = $value['tmp_name'];
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${$name . '_name'} = $value['name'];
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}
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unset( $name, $value );
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}
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if ( ! empty( $_SERVER ) ) {
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$server_vars = array('PHP_SELF', 'HTTP_ACCEPT_LANGUAGE', 'HTTP_AUTHORIZATION');
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foreach ( $server_vars as $current ) {
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// its not important HOW we detect html tags
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// its more important to prevent XSS
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// so its not important if we result in an invalid string,
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// its even better than a XSS capable string
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if ( isset( $_SERVER[$current] ) && false === strpos($_SERVER[$current], '<') ) {
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$$current = $_SERVER[$current];
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// already importet by register_globals?
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} elseif ( ! isset( $$current ) || false !== strpos($$current, '<') ) {
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$$current = '';
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}
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}
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unset( $server_vars, $current );
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} // end if
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unset( $_import_blacklist );
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?>
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