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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* session handling
*
* @version $Id$
* @todo add failover or warn if sessions are not configured properly
* @todo add an option to use mm-module for session handler
* @see http://www.php.net/session
* @uses session_name()
* @uses session_start()
* @uses ini_set()
* @uses version_compare()
* @uses PHP_VERSION
*/
if (! defined('PHPMYADMIN')) {
exit;
}
// verify if PHP supports session, die if it does not
if (!@function_exists('session_name')) {
PMA_fatalError('strCantLoad', 'session');
} elseif (ini_get('session.auto_start') == true && session_name() != 'phpMyAdmin') {
// Do not delete the existing session, it might be used by other
// applications; instead just close it.
session_write_close();
}
// disable starting of sessions before all settings are done
// does not work, besides how it is written in php manual
//ini_set('session.auto_start', 0);
// session cookie settings
session_set_cookie_params(0, PMA_Config::getCookiePath() . '; HttpOnly',
'', PMA_Config::isHttps());
// cookies are safer (use @ini_set() in case this function is disabled)
@ini_set('session.use_cookies', true);
// but not all user allow cookies
@ini_set('session.use_only_cookies', false);
@ini_set('session.use_trans_sid', true);
@ini_set('url_rewriter.tags',
'a=href,frame=src,input=src,form=fakeentry,fieldset=');
//ini_set('arg_separator.output', '&');
// delete session/cookies when browser is closed
@ini_set('session.cookie_lifetime', 0);
// warn but dont work with bug
@ini_set('session.bug_compat_42', false);
@ini_set('session.bug_compat_warn', true);
// use more secure session ids (with PHP 5)
if (version_compare(PHP_VERSION, '5.0.0', 'ge')) {
@ini_set('session.hash_function', 1);
}
// some pages (e.g. stylesheet) may be cached on clients, but not in shared
// proxy servers
session_cache_limiter('private');
// start the session
// on some servers (for example, sourceforge.net), we get a permission error
// on the session data directory, so I add some "@"
// See bug #1538132. This would block normal behavior on a cluster
//ini_set('session.save_handler', 'files');
$session_name = 'phpMyAdmin';
@session_name($session_name);
// strictly, PHP 4 since 4.4.2 would not need a verification
if (version_compare(PHP_VERSION, '5.1.2', 'lt')
&& isset($_COOKIE[$session_name])
&& eregi("\r|\n", $_COOKIE[$session_name])) {
die('attacked');
}
if (! isset($_COOKIE[$session_name])) {
// on first start of session we will check for errors
// f.e. session dir cannot be accessed - session file not created
ob_start();
$old_display_errors = ini_get('display_errors');
$old_error_reporting = error_reporting(E_ALL);
@ini_set('display_errors', 1);
$r = session_start();
@ini_set('display_errors', $old_display_errors);
error_reporting($old_error_reporting);
unset($old_display_errors, $old_error_reporting);
$session_error = ob_get_contents();
ob_end_clean();
if ($r !== true || ! empty($session_error)) {
setcookie($session_name, '', 1);
PMA_fatalError('strSessionStartupErrorGeneral');
}
} else {
@session_start();
}
/**
* Token which is used for authenticating access queries.
* (we use "space PMA_token space" to prevent overwriting)
*/
if (!isset($_SESSION[' PMA_token '])) {
$_SESSION[' PMA_token '] = md5(uniqid(rand(), true));
}
/**
* tries to secure session from hijacking and fixation
* should be called before login and after successfull login
* (only required if sensitive information stored in session)
*
* @uses session_regenerate_id() to secure session from fixation
* @uses session_id() to set new session id
* @uses strip_tags() to prevent XSS attacks in SID
* @uses function_exists() for session_regenerate_id()
*/
function PMA_secureSession()
{
// prevent session fixation and XSS
if (function_exists('session_regenerate_id')) {
session_regenerate_id(true);
} else {
session_id(strip_tags(session_id()));
}
}
?>
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