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<?php
/* $Id: grab_globals.lib.php 9464 2006-09-29 12:54:34Z lem9 $ */
// vim: expandtab sw=4 ts=4 sts=4:
/**
* This library grabs the names and values of the variables sent or posted to a
* script in the $_* arrays and sets simple globals variables from them. It does
* the same work for the $PHP_SELF, $HTTP_ACCEPT_LANGUAGE and
* $HTTP_AUTHORIZATION variables.
*
* loic1 - 2001/25/11: use the new globals arrays defined with php 4.1+
*/
/**
* copy values from one array to another, usally from a superglobal into $GLOBALS
*
* @uses $GLOBALS['_import_blacklist']
* @uses preg_replace()
* @uses array_keys()
* @uses array_unique()
* @uses stripslashes()
* @param array $array values from
* @param array $target values to
* @param boolean $sanitize prevent importing key names in $_import_blacklist
*/
function PMA_gpc_extract($array, &$target, $sanitize = true)
{
if ( ! is_array($array) ) {
return false;
}
if ( $sanitize ) {
$valid_variables = preg_replace($GLOBALS['_import_blacklist'], '',
array_keys($array));
$valid_variables = array_unique($valid_variables);
} else {
$valid_variables = array_keys($array);
}
foreach ( $valid_variables as $key ) {
if ( strlen($key) === 0 ) {
continue;
}
if ( is_array($array[$key]) ) {
// there could be a variable coming from a cookie of
// another application, with the same name as this array
unset( $target[$key] );
PMA_gpc_extract($array[$key], $target[$key], false);
} else {
$target[$key] = $array[$key];
}
}
return true;
}
/**
* @var array $_import_blacklist variable names that should NEVER be imported
* from superglobals
*/
$_import_blacklist = array(
'/^cfg$/i', // PMA configuration
'/^server$/i', // selected server
'/^db$/i', // page to display
'/^table$/i', // page to display
'/^goto$/i', // page to display
'/^back$/i', // the page go back
'/^lang$/i', // selected language
'/^convcharset$/i', // PMA convert charset
'/^collation_connection$/i', //
'/^set_theme$/i', //
'/^sql_query$/i', // the query to be executed
'/^GLOBALS$/i', // the global scope
'/^str.*$/i', // PMA localized strings
'/^_.*$/i', // PMA does not use variables starting with _ from extern
'/^.*\s+.*$/i', // no whitespaces anywhere
'/^[0-9]+.*$/i', // numeric variable names
//'/^PMA_.*$/i', // other PMA variables
);
if (! empty($_GET)) {
PMA_gpc_extract($_GET, $GLOBALS);
}
if (! empty($_POST)) {
PMA_gpc_extract($_POST, $GLOBALS);
}
if (! empty($_FILES)) {
$_valid_variables = preg_replace($GLOBALS['_import_blacklist'], '', array_keys($_FILES));
foreach ($_valid_variables as $name) {
if (strlen($name) != 0) {
$$name = $_FILES[$name]['tmp_name'];
${$name . '_name'} = $_FILES[$name]['name'];
}
}
unset($name, $value);
}
/**
* globalize some environment variables
*/
$server_vars = array('PHP_SELF', 'HTTP_ACCEPT_LANGUAGE', 'HTTP_AUTHORIZATION');
foreach ($server_vars as $current) {
// its not important HOW we detect html tags
// its more important to prevent XSS
// so its not important if we result in an invalid string,
// its even better than a XSS capable string
if (PMA_getenv($current) && false === strpos(PMA_getenv($current), '<')) {
$$current = PMA_getenv($current);
// already importet by register_globals?
} elseif (! isset($$current) || false !== strpos($$current, '<')) {
$$current = '';
}
}
unset($server_vars, $current, $_import_blacklist);
?>
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