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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* session handling
*
* @todo add failover or warn if sessions are not configured properly
* @todo add an option to use mm-module for session handler
*
* @package PhpMyAdmin
* @see http://www.php.net/session
*/
if (! defined('PHPMYADMIN')) {
exit;
}
if (! function_exists('openssl_random_pseudo_bytes')) {
require_once PHPSECLIB_INC_DIR . '/Crypt/Random.php';
}
// verify if PHP supports session, die if it does not
if (!@function_exists('session_name')) {
PMA_warnMissingExtension('session', true);
} 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, $GLOBALS['PMA_Config']->getCookiePath(),
'', $GLOBALS['PMA_Config']->isHttps(), true
);
// cookies are safer (use @ini_set() in case this function is disabled)
@ini_set('session.use_cookies', 'true');
// optionally set session_save_path
$path = $GLOBALS['PMA_Config']->get('SessionSavePath');
if (!empty($path)) {
session_save_path($path);
}
// but not all user allow cookies
@ini_set('session.use_only_cookies', 'false');
// do not force transparent session ids, see bug #3398788
//@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 don't work with bug
@ini_set('session.bug_compat_42', 'false');
@ini_set('session.bug_compat_warn', 'true');
// use more secure session ids
@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);
if (! isset($_COOKIE[$session_name])) {
// on first start of session we check for errors
// f.e. session dir cannot be accessed - session file not created
$orig_error_count = $GLOBALS['error_handler']->countErrors();
$session_result = session_start();
if ($session_result !== true
|| $orig_error_count != $GLOBALS['error_handler']->countErrors()
) {
setcookie($session_name, '', 1);
/*
* Session initialization is done before selecting language, so we
* can not use translations here.
*/
PMA_fatalError(
'Error during session start; please check your PHP and/or '
. 'webserver log file and configure your PHP '
. 'installation properly. Also ensure that cookies are enabled '
. 'in your browser.'
);
}
unset($orig_error_count, $session_result);
} else {
session_start();
}
/**
* Token which is used for authenticating access queries.
* (we use "space PMA_token space" to prevent overwriting)
*/
if (! isset($_SESSION[' PMA_token '])) {
if (! function_exists('openssl_random_pseudo_bytes')) {
$_SESSION[' PMA_token '] = bin2hex(phpseclib\Crypt\Random::string(16));
} else {
$_SESSION[' PMA_token '] = bin2hex(openssl_random_pseudo_bytes(16));
}
}
/**
* tries to secure session from hijacking and fixation
* should be called before login and after successful login
* (only required if sensitive information stored in session)
*
* @return void
*/
function PMA_secureSession()
{
// prevent session fixation and XSS
// (better to use session_status() if available)
if ((PMA_PHP_INT_VERSION >= 50400 && session_status() === PHP_SESSION_ACTIVE)
|| (PMA_PHP_INT_VERSION < 50400 && session_id() !== '')
) {
session_regenerate_id(true);
}
if (! function_exists('openssl_random_pseudo_bytes')) {
$_SESSION[' PMA_token '] = bin2hex(phpseclib\Crypt\Random::string(16));
} else {
$_SESSION[' PMA_token '] = bin2hex(openssl_random_pseudo_bytes(16));
}
}
?>