mirror of
https://github.com/moodle/moodle.git
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758 lines
26 KiB
PHP
758 lines
26 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Session manager class.
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*
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* @package core
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* @copyright 2013 Petr Skoda {@link http://skodak.org}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core\session;
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defined('MOODLE_INTERNAL') || die();
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/**
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* Session manager, this is the public Moodle API for sessions.
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*
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* Following PHP functions MUST NOT be used directly:
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* - session_start() - not necessary, lib/setup.php starts session automatically,
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* use define('NO_MOODLE_COOKIE', true) if session not necessary.
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* - session_write_close() - use \core\session\manager::write_close() instead.
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* - session_destroy() - use require_logout() instead.
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*
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* @package core
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* @copyright 2013 Petr Skoda {@link http://skodak.org}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class manager {
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/** @var handler $handler active session handler instance */
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protected static $handler;
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/** @var bool $sessionactive Is the session active? */
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protected static $sessionactive = null;
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/**
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* Start user session.
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*
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* Note: This is intended to be called only from lib/setup.php!
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*/
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public static function start() {
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global $CFG, $DB;
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if (isset(self::$sessionactive)) {
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debugging('Session was already started!', DEBUG_DEVELOPER);
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return;
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}
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self::load_handler();
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// Init the session handler only if everything initialised properly in lib/setup.php file
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// and the session is actually required.
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if (empty($DB) or empty($CFG->version) or !defined('NO_MOODLE_COOKIES') or NO_MOODLE_COOKIES or CLI_SCRIPT) {
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self::$sessionactive = false;
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self::init_empty_session();
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return;
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}
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try {
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self::$handler->init();
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self::prepare_cookies();
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$newsid = empty($_COOKIE[session_name()]);
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self::$handler->start();
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self::initialise_user_session($newsid);
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self::check_security();
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} catch (\Exception $ex) {
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@session_write_close();
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self::init_empty_session();
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self::$sessionactive = false;
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throw $ex;
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}
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self::$sessionactive = true;
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}
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/**
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* Returns current page performance info.
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*
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* @return array perf info
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*/
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public static function get_performance_info() {
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if (!session_id()) {
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return array();
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}
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self::load_handler();
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$size = display_size(strlen(session_encode()));
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$handler = get_class(self::$handler);
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$info = array();
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$info['size'] = $size;
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$info['html'] = "<span class=\"sessionsize\">Session ($handler): $size</span> ";
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$info['txt'] = "Session ($handler): $size ";
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return $info;
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}
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/**
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* Create handler instance.
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*/
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protected static function load_handler() {
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global $CFG, $DB;
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if (self::$handler) {
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return;
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}
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// Find out which handler to use.
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if (PHPUNIT_TEST) {
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$class = '\core\session\file';
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} else if (!empty($CFG->session_handler_class)) {
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$class = $CFG->session_handler_class;
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} else if (!empty($CFG->dbsessions) and $DB->session_lock_supported()) {
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$class = '\core\session\database';
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} else {
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$class = '\core\session\file';
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}
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self::$handler = new $class();
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}
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/**
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* Empty current session, fill it with not-logged-in user info.
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*/
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protected static function init_empty_session() {
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global $CFG;
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// Session not used at all.
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$_SESSION = array();
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$_SESSION['SESSION'] = new \stdClass();
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$_SESSION['USER'] = new \stdClass();
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$_SESSION['USER']->id = 0;
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if (isset($CFG->mnet_localhost_id)) {
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$_SESSION['USER']->mnethostid = $CFG->mnet_localhost_id;
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} else {
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// Not installed yet, the future host id will be most probably 1.
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$_SESSION['USER']->mnethostid = 1;
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}
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if (PHPUNIT_TEST or defined('BEHAT_TEST')) {
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// Phpunit tests and behat init use reversed reference,
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// the reason is we can not point global to $_SESSION outside of global scope.
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global $USER, $SESSION;
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$USER = $_SESSION['USER'];
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$SESSION = $_SESSION['SESSION'];
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$_SESSION['USER'] =& $USER;
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$_SESSION['SESSION'] =& $SESSION;
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}
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}
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/**
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* Make sure all cookie and session related stuff is configured properly before session start.
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*/
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protected static function prepare_cookies() {
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global $CFG;
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if (!isset($CFG->cookiesecure) or (strpos($CFG->wwwroot, 'https://') !== 0 and empty($CFG->sslproxy))) {
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$CFG->cookiesecure = 0;
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}
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if (!isset($CFG->cookiehttponly)) {
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$CFG->cookiehttponly = 0;
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}
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// Set sessioncookie variable if it isn't already.
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if (!isset($CFG->sessioncookie)) {
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$CFG->sessioncookie = '';
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}
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$sessionname = 'MoodleSession'.$CFG->sessioncookie;
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// Make sure cookie domain makes sense for this wwwroot.
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if (!isset($CFG->sessioncookiedomain)) {
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$CFG->sessioncookiedomain = '';
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} else if ($CFG->sessioncookiedomain !== '') {
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$host = parse_url($CFG->wwwroot, PHP_URL_HOST);
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if ($CFG->sessioncookiedomain !== $host) {
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if (substr($CFG->sessioncookiedomain, 0, 1) === '.') {
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if (!preg_match('|^.*'.preg_quote($CFG->sessioncookiedomain, '|').'$|', $host)) {
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// Invalid domain - it must be end part of host.
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$CFG->sessioncookiedomain = '';
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}
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} else {
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if (!preg_match('|^.*\.'.preg_quote($CFG->sessioncookiedomain, '|').'$|', $host)) {
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// Invalid domain - it must be end part of host.
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$CFG->sessioncookiedomain = '';
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}
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}
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}
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}
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// Make sure the cookiepath is valid for this wwwroot or autodetect if not specified.
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if (!isset($CFG->sessioncookiepath)) {
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$CFG->sessioncookiepath = '';
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}
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if ($CFG->sessioncookiepath !== '/') {
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$path = parse_url($CFG->wwwroot, PHP_URL_PATH).'/';
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if ($CFG->sessioncookiepath === '') {
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$CFG->sessioncookiepath = $path;
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} else {
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if (strpos($path, $CFG->sessioncookiepath) !== 0 or substr($CFG->sessioncookiepath, -1) !== '/') {
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$CFG->sessioncookiepath = $path;
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}
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}
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}
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// Discard session ID from POST, GET and globals to tighten security,
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// this is session fixation prevention.
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unset($GLOBALS[$sessionname]);
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unset($_GET[$sessionname]);
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unset($_POST[$sessionname]);
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unset($_REQUEST[$sessionname]);
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// Compatibility hack for non-browser access to our web interface.
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if (!empty($_COOKIE[$sessionname]) && $_COOKIE[$sessionname] == "deleted") {
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unset($_COOKIE[$sessionname]);
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}
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// Set configuration.
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session_name($sessionname);
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session_set_cookie_params(0, $CFG->sessioncookiepath, $CFG->sessioncookiedomain, $CFG->cookiesecure, $CFG->cookiehttponly);
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ini_set('session.use_trans_sid', '0');
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ini_set('session.use_only_cookies', '1');
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ini_set('session.hash_function', '0'); // For now MD5 - we do not have room for sha-1 in sessions table.
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ini_set('session.use_strict_mode', '0'); // We have custom protection in session init.
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ini_set('session.serialize_handler', 'php'); // We can move to 'php_serialize' after we require PHP 5.5.4 form Moodle.
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// Moodle does normal session timeouts, this is for leftovers only.
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ini_set('session.gc_probability', 1);
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ini_set('session.gc_divisor', 1000);
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ini_set('session.gc_maxlifetime', 60*60*24*4);
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}
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/**
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* Initialise $USER and $SESSION objects, handles google access
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* and sets up not-logged-in user properly.
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*
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* @param bool $newsid is this a new session in first http request?
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*/
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protected static function initialise_user_session($newsid) {
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global $CFG, $DB;
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$sid = session_id();
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if (!$sid) {
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// No session, very weird.
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error_log('Missing session ID, session not started!');
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self::init_empty_session();
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return;
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}
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if (!$record = $DB->get_record('sessions', array('sid'=>$sid), 'id, sid, state, userid, lastip, timecreated, timemodified')) {
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if (!$newsid) {
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if (!empty($_SESSION['USER']->id)) {
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// This should not happen, just log it, we MUST not produce any output here!
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error_log("Cannot find session record $sid for user ".$_SESSION['USER']->id.", creating new session.");
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}
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// Prevent session fixation attacks.
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session_regenerate_id(true);
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}
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$_SESSION = array();
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}
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unset($sid);
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if (isset($_SESSION['USER']->id)) {
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if (!empty($_SESSION['USER']->realuser)) {
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$userid = $_SESSION['USER']->realuser;
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} else {
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$userid = $_SESSION['USER']->id;
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}
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// Verify timeout first.
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$maxlifetime = $CFG->sessiontimeout;
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$timeout = false;
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if (isguestuser($userid) or empty($userid)) {
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// Ignore guest and not-logged in timeouts, there is very little risk here.
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$timeout = false;
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} else if ($record->timemodified < time() - $maxlifetime) {
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$timeout = true;
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$authsequence = get_enabled_auth_plugins(); // Auths, in sequence.
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foreach ($authsequence as $authname) {
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$authplugin = get_auth_plugin($authname);
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if ($authplugin->ignore_timeout_hook($_SESSION['USER'], $record->sid, $record->timecreated, $record->timemodified)) {
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$timeout = false;
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break;
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}
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}
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}
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if ($timeout) {
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session_regenerate_id(true);
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$_SESSION = array();
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$DB->delete_records('sessions', array('id'=>$record->id));
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} else {
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// Update session tracking record.
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$update = new \stdClass();
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$updated = false;
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if ($record->userid != $userid) {
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$update->userid = $record->userid = $userid;
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$updated = true;
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}
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$ip = getremoteaddr();
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if ($record->lastip != $ip) {
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$update->lastip = $record->lastip = $ip;
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$updated = true;
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}
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$updatefreq = empty($CFG->session_update_timemodified_frequency) ? 20 : $CFG->session_update_timemodified_frequency;
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if ($record->timemodified == $record->timecreated) {
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// Always do first update of existing record.
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$update->timemodified = $record->timemodified = time();
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$updated = true;
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} else if ($record->timemodified < time() - $updatefreq) {
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// Update the session modified flag only once every 20 seconds.
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$update->timemodified = $record->timemodified = time();
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$updated = true;
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}
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if ($updated) {
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$update->id = $record->id;
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$DB->update_record('sessions', $update);
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}
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return;
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}
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} else {
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if ($record) {
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// This happens when people switch session handlers...
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session_regenerate_id(true);
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$_SESSION = array();
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$DB->delete_records('sessions', array('id'=>$record->id));
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}
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}
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unset($record);
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$timedout = false;
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if (!isset($_SESSION['SESSION'])) {
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$_SESSION['SESSION'] = new \stdClass();
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if (!$newsid) {
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$timedout = true;
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}
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}
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$user = null;
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if (!empty($CFG->opentogoogle)) {
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if (is_web_crawler()) {
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$user = guest_user();
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}
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if (!empty($CFG->guestloginbutton) and !$user and !empty($_SERVER['HTTP_REFERER'])) {
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// Automatically log in users coming from search engine results.
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if (strpos($_SERVER['HTTP_REFERER'], 'google') !== false ) {
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$user = guest_user();
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} else if (strpos($_SERVER['HTTP_REFERER'], 'altavista') !== false ) {
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$user = guest_user();
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}
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}
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}
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// Setup $USER and insert the session tracking record.
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if ($user) {
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self::set_user($user);
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self::add_session_record($user->id);
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} else {
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self::init_empty_session();
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self::add_session_record(0);
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}
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if ($timedout) {
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$_SESSION['SESSION']->has_timed_out = true;
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}
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}
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/**
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* Insert new empty session record.
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* @param int $userid
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* @return \stdClass the new record
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*/
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protected static function add_session_record($userid) {
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global $DB;
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$record = new \stdClass();
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$record->state = 0;
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$record->sid = session_id();
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$record->sessdata = null;
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$record->userid = $userid;
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$record->timecreated = $record->timemodified = time();
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$record->firstip = $record->lastip = getremoteaddr();
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$record->id = $DB->insert_record('sessions', $record);
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return $record;
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}
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/**
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* Do various session security checks.
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*/
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protected static function check_security() {
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global $CFG;
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if (!empty($_SESSION['USER']->id) and !empty($CFG->tracksessionip)) {
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// Make sure current IP matches the one for this session.
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$remoteaddr = getremoteaddr();
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if (empty($_SESSION['USER']->sessionip)) {
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$_SESSION['USER']->sessionip = $remoteaddr;
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}
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if ($_SESSION['USER']->sessionip != $remoteaddr) {
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// This is a security feature - terminate the session in case of any doubt.
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self::terminate_current();
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throw new exception('sessionipnomatch2', 'error');
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}
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}
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}
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/**
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* Login user, to be called from complete_user_login() only.
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* @param \stdClass $user
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*/
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public static function login_user(\stdClass $user) {
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global $DB;
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// Regenerate session id and delete old session,
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// this helps prevent session fixation attacks from the same domain.
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$sid = session_id();
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session_regenerate_id(true);
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$DB->delete_records('sessions', array('sid'=>$sid));
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self::add_session_record($user->id);
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// Let enrol plugins deal with new enrolments if necessary.
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enrol_check_plugins($user);
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// Setup $USER object.
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self::set_user($user);
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}
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/**
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* Terminate current user session.
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* @return void
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*/
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public static function terminate_current() {
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global $DB;
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if (!self::$sessionactive) {
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self::init_empty_session();
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self::$sessionactive = false;
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return;
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}
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try {
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$DB->delete_records('external_tokens', array('sid'=>session_id(), 'tokentype'=>EXTERNAL_TOKEN_EMBEDDED));
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} catch (\Exception $ignored) {
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// Probably install/upgrade - ignore this problem.
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}
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// Initialize variable to pass-by-reference to headers_sent(&$file, &$line).
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$file = null;
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$line = null;
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if (headers_sent($file, $line)) {
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error_log('Cannot terminate session properly - headers were already sent in file: '.$file.' on line '.$line);
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}
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// Write new empty session and make sure the old one is deleted.
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$sid = session_id();
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session_regenerate_id(true);
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$DB->delete_records('sessions', array('sid'=>$sid));
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self::init_empty_session();
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self::add_session_record($_SESSION['USER']->id);
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session_write_close();
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self::$sessionactive = false;
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}
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/**
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* No more changes in session expected.
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* Unblocks the sessions, other scripts may start executing in parallel.
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*/
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public static function write_close() {
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if (self::$sessionactive) {
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session_write_close();
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} else {
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if (session_id()) {
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@session_write_close();
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}
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}
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self::$sessionactive = false;
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}
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/**
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* Does the PHP session with given id exist?
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*
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* Note: this does not actually verify the presence of sessions record.
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*
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* @param string $sid
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* @return bool
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*/
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public static function session_exists($sid) {
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self::load_handler();
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return self::$handler->session_exists($sid);
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}
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/**
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* Fake last access for given session, this prevents session timeout.
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* @param string $sid
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*/
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public static function touch_session($sid) {
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global $DB;
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// Timeouts depend on core sessions table only, no need to update anything in external stores.
|
|
|
|
$sql = "UPDATE {sessions} SET timemodified = :now WHERE sid = :sid";
|
|
$DB->execute($sql, array('now'=>time(), 'sid'=>$sid));
|
|
}
|
|
|
|
/**
|
|
* Terminate all sessions unconditionally.
|
|
*/
|
|
public static function kill_all_sessions() {
|
|
global $DB;
|
|
|
|
self::terminate_current();
|
|
|
|
self::load_handler();
|
|
self::$handler->kill_all_sessions();
|
|
|
|
try {
|
|
$DB->delete_records('sessions');
|
|
} catch (\dml_exception $ignored) {
|
|
// Do not show any warnings - might be during upgrade/installation.
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Terminate give session unconditionally.
|
|
* @param string $sid
|
|
*/
|
|
public static function kill_session($sid) {
|
|
global $DB;
|
|
|
|
self::load_handler();
|
|
|
|
if ($sid === session_id()) {
|
|
self::write_close();
|
|
}
|
|
|
|
self::$handler->kill_session($sid);
|
|
|
|
$DB->delete_records('sessions', array('sid'=>$sid));
|
|
}
|
|
|
|
/**
|
|
* Terminate all sessions of given user unconditionally.
|
|
* @param int $userid
|
|
*/
|
|
public static function kill_user_sessions($userid) {
|
|
global $DB;
|
|
|
|
$sessions = $DB->get_records('sessions', array('userid'=>$userid), 'id DESC', 'id, sid');
|
|
foreach ($sessions as $session) {
|
|
self::kill_session($session->sid);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set current user.
|
|
*
|
|
* @param \stdClass $user record
|
|
*/
|
|
public static function set_user(\stdClass $user) {
|
|
$_SESSION['USER'] = $user;
|
|
unset($_SESSION['USER']->description); // Conserve memory.
|
|
unset($_SESSION['USER']->password); // Improve security.
|
|
if (isset($_SESSION['USER']->lang)) {
|
|
// Make sure it is a valid lang pack name.
|
|
$_SESSION['USER']->lang = clean_param($_SESSION['USER']->lang, PARAM_LANG);
|
|
}
|
|
sesskey(); // Init session key.
|
|
|
|
if (PHPUNIT_TEST or defined('BEHAT_TEST')) {
|
|
// Phpunit tests and behat init use reversed reference,
|
|
// the reason is we can not point global to $_SESSION outside of global scope.
|
|
global $USER;
|
|
$USER = $_SESSION['USER'];
|
|
$_SESSION['USER'] =& $USER;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Periodic timed-out session cleanup.
|
|
*/
|
|
public static function gc() {
|
|
global $CFG, $DB;
|
|
|
|
// This may take a long time...
|
|
\core_php_time_limit::raise();
|
|
|
|
$maxlifetime = $CFG->sessiontimeout;
|
|
|
|
try {
|
|
// Kill all sessions of deleted and suspended users without any hesitation.
|
|
$rs = $DB->get_recordset_select('sessions', "userid IN (SELECT id FROM {user} WHERE deleted <> 0 OR suspended <> 0)", array(), 'id DESC', 'id, sid');
|
|
foreach ($rs as $session) {
|
|
self::kill_session($session->sid);
|
|
}
|
|
$rs->close();
|
|
|
|
// Kill sessions of users with disabled plugins.
|
|
$auth_sequence = get_enabled_auth_plugins(true);
|
|
$auth_sequence = array_flip($auth_sequence);
|
|
unset($auth_sequence['nologin']); // No login means user cannot login.
|
|
$auth_sequence = array_flip($auth_sequence);
|
|
|
|
list($notplugins, $params) = $DB->get_in_or_equal($auth_sequence, SQL_PARAMS_QM, '', false);
|
|
$rs = $DB->get_recordset_select('sessions', "userid IN (SELECT id FROM {user} WHERE auth $notplugins)", $params, 'id DESC', 'id, sid');
|
|
foreach ($rs as $session) {
|
|
self::kill_session($session->sid);
|
|
}
|
|
$rs->close();
|
|
|
|
// Now get a list of time-out candidates - real users only.
|
|
$sql = "SELECT u.*, s.sid, s.timecreated AS s_timecreated, s.timemodified AS s_timemodified
|
|
FROM {user} u
|
|
JOIN {sessions} s ON s.userid = u.id
|
|
WHERE s.timemodified < :purgebefore AND u.id <> :guestid";
|
|
$params = array('purgebefore' => (time() - $maxlifetime), 'guestid'=>$CFG->siteguest);
|
|
|
|
$authplugins = array();
|
|
foreach ($auth_sequence as $authname) {
|
|
$authplugins[$authname] = get_auth_plugin($authname);
|
|
}
|
|
$rs = $DB->get_recordset_sql($sql, $params);
|
|
foreach ($rs as $user) {
|
|
foreach ($authplugins as $authplugin) {
|
|
/** @var \auth_plugin_base $authplugin*/
|
|
if ($authplugin->ignore_timeout_hook($user, $user->sid, $user->s_timecreated, $user->s_timemodified)) {
|
|
continue;
|
|
}
|
|
}
|
|
self::kill_session($user->sid);
|
|
}
|
|
$rs->close();
|
|
|
|
// Delete expired sessions for guest user account, give them larger timeout, there is no security risk here.
|
|
$params = array('purgebefore' => (time() - ($maxlifetime * 5)), 'guestid'=>$CFG->siteguest);
|
|
$rs = $DB->get_recordset_select('sessions', 'userid = :guestid AND timemodified < :purgebefore', $params, 'id DESC', 'id, sid');
|
|
foreach ($rs as $session) {
|
|
self::kill_session($session->sid);
|
|
}
|
|
$rs->close();
|
|
|
|
// Delete expired sessions for userid = 0 (not logged in), better kill them asap to release memory.
|
|
$params = array('purgebefore' => (time() - $maxlifetime));
|
|
$rs = $DB->get_recordset_select('sessions', 'userid = 0 AND timemodified < :purgebefore', $params, 'id DESC', 'id, sid');
|
|
foreach ($rs as $session) {
|
|
self::kill_session($session->sid);
|
|
}
|
|
$rs->close();
|
|
|
|
// Cleanup letfovers from the first browser access because it may set multiple cookies and then use only one.
|
|
$params = array('purgebefore' => (time() - 60*3));
|
|
$rs = $DB->get_recordset_select('sessions', 'userid = 0 AND timemodified = timecreated AND timemodified < :purgebefore', $params, 'id ASC', 'id, sid');
|
|
foreach ($rs as $session) {
|
|
self::kill_session($session->sid);
|
|
}
|
|
$rs->close();
|
|
|
|
} catch (\Exception $ex) {
|
|
debugging('Error gc-ing sessions: '.$ex->getMessage(), DEBUG_NORMAL, $ex->getTrace());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Is current $USER logged-in-as somebody else?
|
|
* @return bool
|
|
*/
|
|
public static function is_loggedinas() {
|
|
return !empty($_SESSION['USER']->realuser);
|
|
}
|
|
|
|
/**
|
|
* Returns the $USER object ignoring current login-as session
|
|
* @return \stdClass user object
|
|
*/
|
|
public static function get_realuser() {
|
|
if (self::is_loggedinas()) {
|
|
return $_SESSION['REALUSER'];
|
|
} else {
|
|
return $_SESSION['USER'];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Login as another user - no security checks here.
|
|
* @param int $userid
|
|
* @param \context $context
|
|
* @return void
|
|
*/
|
|
public static function loginas($userid, \context $context) {
|
|
global $USER;
|
|
|
|
if (self::is_loggedinas()) {
|
|
return;
|
|
}
|
|
|
|
// Switch to fresh new $SESSION.
|
|
$_SESSION['REALSESSION'] = $_SESSION['SESSION'];
|
|
$_SESSION['SESSION'] = new \stdClass();
|
|
|
|
// Create the new $USER object with all details and reload needed capabilities.
|
|
$_SESSION['REALUSER'] = $_SESSION['USER'];
|
|
$user = get_complete_user_data('id', $userid);
|
|
$user->realuser = $_SESSION['REALUSER']->id;
|
|
$user->loginascontext = $context;
|
|
|
|
// Let enrol plugins deal with new enrolments if necessary.
|
|
enrol_check_plugins($user);
|
|
|
|
// Create event before $USER is updated.
|
|
$event = \core\event\user_loggedinas::create(
|
|
array(
|
|
'objectid' => $USER->id,
|
|
'context' => $context,
|
|
'relateduserid' => $userid,
|
|
'other' => array(
|
|
'originalusername' => fullname($USER, true),
|
|
'loggedinasusername' => fullname($user, true)
|
|
)
|
|
)
|
|
);
|
|
// Set up global $USER.
|
|
\core\session\manager::set_user($user);
|
|
$event->trigger();
|
|
}
|
|
}
|