463 lines
15 KiB
PHP
463 lines
15 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* User session handling functions.
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*
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* The user-level session storage handlers:
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* - _drupal_session_open()
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* - _drupal_session_close()
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* - _drupal_session_read()
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* - _drupal_session_write()
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* - _drupal_session_destroy()
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* - _drupal_session_garbage_collection()
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* are assigned by session_set_save_handler() in bootstrap.inc and are called
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* automatically by PHP. These functions should not be called directly. Session
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* data should instead be accessed via the $_SESSION superglobal.
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*/
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/**
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* Session handler assigned by session_set_save_handler().
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*
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* This function is used to handle any initialization, such as file paths or
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* database connections, that is needed before accessing session data. Drupal
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* does not need to initialize anything in this function.
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*
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* This function should not be called directly.
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*
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* @return
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* This function will always return TRUE.
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*/
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function _drupal_session_open() {
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return TRUE;
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}
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/**
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* Session handler assigned by session_set_save_handler().
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*
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* This function is used to close the current session. Because Drupal stores
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* session data in the database immediately on write, this function does
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* not need to do anything.
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*
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* This function should not be called directly.
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*
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* @return
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* This function will always return TRUE.
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*/
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function _drupal_session_close() {
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return TRUE;
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}
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/**
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* Session handler assigned by session_set_save_handler().
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*
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* This function will be called by PHP to retrieve the current user's
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* session data, which is stored in the database. It also loads the
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* current user's appropriate roles into the user object.
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*
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* This function should not be called directly. Session data should
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* instead be accessed via the $_SESSION superglobal.
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*
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* @param $sid
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* Session ID.
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*
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* @return
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* Either an array of the session data, or an empty string, if no data
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* was found or the user is anonymous.
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*/
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function _drupal_session_read($sid) {
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global $user, $is_https;
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// Write and Close handlers are called after destructing objects
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// since PHP 5.0.5.
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// Thus destructors can use sessions but session handler can't use objects.
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// So we are moving session closure before destructing objects.
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drupal_register_shutdown_function('session_write_close');
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// Handle the case of first time visitors and clients that don't store
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// cookies (eg. web crawlers).
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$insecure_session_name = substr(session_name(), 1);
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if (!isset($_COOKIE[session_name()]) && !isset($_COOKIE[$insecure_session_name])) {
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$user = drupal_anonymous_user();
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return '';
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}
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// Otherwise, if the session is still active, we have a record of the
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// client's session in the database. If it's HTTPS then we are either have
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// a HTTPS session or we are about to log in so we check the sessions table
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// for an anonymous session with the non-HTTPS-only cookie.
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if ($is_https) {
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$user = db_query("SELECT u.*, s.* FROM {users} u INNER JOIN {sessions} s ON u.uid = s.uid WHERE s.ssid = :ssid", array(':ssid' => $sid))->fetchObject();
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if (!$user) {
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if (isset($_COOKIE[$insecure_session_name])) {
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$user = db_query("SELECT u.*, s.* FROM {users} u INNER JOIN {sessions} s ON u.uid = s.uid WHERE s.sid = :sid AND s.uid = 0", array(
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':sid' => $_COOKIE[$insecure_session_name]))
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->fetchObject();
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}
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}
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}
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else {
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$user = db_query("SELECT u.*, s.* FROM {users} u INNER JOIN {sessions} s ON u.uid = s.uid WHERE s.sid = :sid", array(':sid' => $sid))->fetchObject();
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}
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// We found the client's session record and they are an authenticated,
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// active user.
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if ($user && $user->uid > 0 && $user->status == 1) {
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// This is done to unserialize the data member of $user.
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$user->data = unserialize($user->data);
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// Add roles element to $user.
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$user->roles = array();
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$user->roles[DRUPAL_AUTHENTICATED_RID] = 'authenticated user';
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$user->roles += db_query("SELECT r.rid, r.name FROM {role} r INNER JOIN {users_roles} ur ON ur.rid = r.rid WHERE ur.uid = :uid", array(':uid' => $user->uid))->fetchAllKeyed(0, 1);
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}
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// We didn't find the client's record (session has expired), or they are
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// blocked, or they are an anonymous user.
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else {
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$session = isset($user->session) ? $user->session : '';
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$user = drupal_anonymous_user($session);
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}
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return $user->session;
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}
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/**
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* Session handler assigned by session_set_save_handler().
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*
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* This function will be called by PHP to store the current user's
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* session, which Drupal saves to the database.
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*
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* This function should not be called directly. Session data should
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* instead be accessed via the $_SESSION superglobal.
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*
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* @param $sid
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* Session ID.
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* @param $value
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* Serialized array of the session data.
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*
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* @return
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* This function will always return TRUE.
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*/
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function _drupal_session_write($sid, $value) {
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global $user, $is_https;
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// The exception handler is not active at this point, so we need to do it manually.
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try {
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if (!drupal_save_session()) {
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// We don't have anything to do if we are not allowed to save the session.
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return;
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}
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// Either ssid or sid or both will be added from $key below.
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$fields = array(
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'uid' => $user->uid,
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'cache' => isset($user->cache) ? $user->cache : 0,
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'hostname' => ip_address(),
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'session' => $value,
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'timestamp' => REQUEST_TIME,
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);
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// The "secure pages" setting allows a site to simultaneously use both secure
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// and insecure session cookies. If enabled and both cookies are presented
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// then use both keys. If not enabled but on HTTPS then use the PHP session
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// id as 'ssid'. If on HTTP then use the PHP session id as 'sid'.
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if ($is_https) {
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$key['ssid'] = $sid;
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$insecure_session_name = substr(session_name(), 1);
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if (variable_get('https', FALSE) && isset($_COOKIE[$insecure_session_name])) {
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$key['sid'] = $_COOKIE[$insecure_session_name];
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}
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}
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else {
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$key['sid'] = $sid;
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}
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db_merge('sessions')
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->key($key)
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->fields($fields)
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->execute();
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// Last access time is updated no more frequently than once every 180 seconds.
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// This reduces contention in the users table.
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if ($user->uid && REQUEST_TIME - $user->access > variable_get('session_write_interval', 180)) {
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db_update('users')
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->fields(array(
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'access' => REQUEST_TIME
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))
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->condition('uid', $user->uid)
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->execute();
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}
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return TRUE;
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}
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catch (Exception $exception) {
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require_once DRUPAL_ROOT . '/includes/errors.inc';
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// If we are displaying errors, then do so with no possibility of a further uncaught exception being thrown.
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if (error_displayable()) {
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print '<h1>Uncaught exception thrown in session handler.</h1>';
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print '<p>' . _drupal_render_exception_safe($exception) . '</p><hr />';
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}
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return FALSE;
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}
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}
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/**
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* Initialize the session handler, starting a session if needed.
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*/
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function drupal_session_initialize() {
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global $user, $is_https;
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session_set_save_handler('_drupal_session_open', '_drupal_session_close', '_drupal_session_read', '_drupal_session_write', '_drupal_session_destroy', '_drupal_session_garbage_collection');
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if (isset($_COOKIE[session_name()]) || ($is_https && variable_get('https', FALSE) && isset($_COOKIE[substr(session_name(), 1)]))) {
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// If a session cookie exists, initialize the session. Otherwise the
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// session is only started on demand in drupal_session_commit(), making
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// anonymous users not use a session cookie unless something is stored in
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// $_SESSION. This allows HTTP proxies to cache anonymous pageviews.
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drupal_session_start();
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if (!empty($user->uid) || !empty($_SESSION)) {
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drupal_page_is_cacheable(FALSE);
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}
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}
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else {
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// Set a session identifier for this request. This is necessary because
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// we lazily start sessions at the end of this request, and some
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// processes (like drupal_get_token()) needs to know the future
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// session ID in advance.
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$user = drupal_anonymous_user();
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// Less random sessions (which are much faster to generate) are used for
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// anonymous users than are generated in drupal_session_regenerate() when
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// a user becomes authenticated.
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session_id(drupal_hash_base64(uniqid(mt_rand(), TRUE)));
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}
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date_default_timezone_set(drupal_get_user_timezone());
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}
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/**
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* Forcefully start a session, preserving already set session data.
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*
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* @ingroup php_wrappers
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*/
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function drupal_session_start() {
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// Command line clients do not support cookies nor sessions.
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if (!drupal_session_started() && !drupal_is_cli()) {
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// Save current session data before starting it, as PHP will destroy it.
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$session_data = isset($_SESSION) ? $_SESSION : NULL;
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session_start();
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drupal_session_started(TRUE);
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// Restore session data.
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if (!empty($session_data)) {
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$_SESSION += $session_data;
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}
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}
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}
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/**
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* Commit the current session, if necessary.
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*
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* If an anonymous user already have an empty session, destroy it.
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*/
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function drupal_session_commit() {
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global $user;
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if (!drupal_save_session()) {
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// We don't have anything to do if we are not allowed to save the session.
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return;
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}
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if (empty($user->uid) && empty($_SESSION)) {
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// There is no session data to store, destroy the session if it was
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// previously started.
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if (drupal_session_started()) {
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session_destroy();
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}
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}
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else {
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// There is session data to store. Start the session if it is not already
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// started.
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if (!drupal_session_started()) {
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drupal_session_start();
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}
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// Write the session data.
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session_write_close();
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}
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}
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/**
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* Return whether a session has been started.
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*/
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function drupal_session_started($set = NULL) {
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static $session_started = FALSE;
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if (isset($set)) {
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$session_started = $set;
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}
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return $session_started && session_id();
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}
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/**
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* Called when an anonymous user becomes authenticated or vice-versa.
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*
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* @ingroup php_wrappers
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*/
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function drupal_session_regenerate() {
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global $user, $is_https;
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if ($is_https && variable_get('https', FALSE)) {
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$insecure_session_name = substr(session_name(), 1);
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if (isset($_COOKIE[$insecure_session_name])) {
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$old_insecure_session_id = $_COOKIE[$insecure_session_name];
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}
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$params = session_get_cookie_params();
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$session_id = drupal_hash_base64(uniqid(mt_rand(), TRUE) . drupal_random_bytes(55));
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// If the session cookie lifetime is set, the session will expire $params['lifetime'] seconds from the current request.
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// If it is not set, it will expire when the browser is closed.
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$expire = $params['lifetime'] ? REQUEST_TIME + $params['lifetime'] : 0;
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setcookie($insecure_session_name, $session_id, $expire, $params['path'], $params['domain'], FALSE, $params['httponly']);
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$_COOKIE[$insecure_session_name] = $session_id;
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}
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if (drupal_session_started()) {
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$old_session_id = session_id();
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}
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session_id(drupal_hash_base64(uniqid(mt_rand(), TRUE) . drupal_random_bytes(55)));
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if (isset($old_session_id)) {
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$params = session_get_cookie_params();
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$expire = $params['lifetime'] ? REQUEST_TIME + $params['lifetime'] : 0;
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setcookie(session_name(), session_id(), $expire, $params['path'], $params['domain'], $params['secure'], $params['httponly']);
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$fields = array('sid' => session_id());
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if ($is_https) {
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$fields['ssid'] = session_id();
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// If the "secure pages" setting is enabled, use the newly-created
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// insecure session identifier as the regenerated sid.
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if (variable_get('https', FALSE)) {
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$fields['sid'] = $session_id;
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}
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}
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db_update('sessions')
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->fields($fields)
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->condition($is_https ? 'ssid' : 'sid', $old_session_id)
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->execute();
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}
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elseif (isset($old_insecure_session_id)) {
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// If logging in to the secure site, and there was no active session on the
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// secure site but a session was active on the insecure site, update the
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// insecure session with the new session identifiers.
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db_update('sessions')
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->fields(array('sid' => $session_id, 'ssid' => session_id()))
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->condition('sid', $old_insecure_session_id)
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->execute();
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}
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else {
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// Start the session when it doesn't exist yet.
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// Preserve the logged in user, as it will be reset to anonymous
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// by _drupal_session_read.
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$account = $user;
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drupal_session_start();
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$user = $account;
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}
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date_default_timezone_set(drupal_get_user_timezone());
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}
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/**
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* Session handler assigned by session_set_save_handler().
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*
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* Cleanup a specific session.
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*
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* @param $sid
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* Session ID.
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*/
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function _drupal_session_destroy($sid) {
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global $user, $is_https;
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// Delete session data.
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db_delete('sessions')
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->condition($is_https ? 'ssid' : 'sid', $sid)
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->execute();
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// Reset $_SESSION and $user to prevent a new session from being started
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// in drupal_session_commit().
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$_SESSION = array();
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$user = drupal_anonymous_user();
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// Unset the session cookies.
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_drupal_session_delete_cookie(session_name());
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if ($is_https) {
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_drupal_session_delete_cookie(substr(session_name(), 1), TRUE);
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}
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}
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/**
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* Deletes the session cookie.
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*
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* @param $name
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* Name of session cookie to delete.
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* @param $force_insecure
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* Force cookie to be insecure.
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*/
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function _drupal_session_delete_cookie($name, $force_insecure = FALSE) {
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if (isset($_COOKIE[$name])) {
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$params = session_get_cookie_params();
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setcookie($name, '', REQUEST_TIME - 3600, $params['path'], $params['domain'], !$force_insecure && $params['secure'], $params['httponly']);
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unset($_COOKIE[$name]);
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}
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}
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/**
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* End a specific user's session(s).
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*
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* @param $uid
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* User ID.
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*/
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function drupal_session_destroy_uid($uid) {
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db_delete('sessions')
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->condition('uid', $uid)
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->execute();
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}
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/**
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* Session handler assigned by session_set_save_handler().
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*
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* Cleanup stalled sessions.
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*
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* @param $lifetime
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* The value of session.gc_maxlifetime, passed by PHP.
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* Sessions not updated for more than $lifetime seconds will be removed.
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*/
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function _drupal_session_garbage_collection($lifetime) {
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// Be sure to adjust 'php_value session.gc_maxlifetime' to a large enough
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// value. For example, if you want user sessions to stay in your database
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// for three weeks before deleting them, you need to set gc_maxlifetime
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// to '1814400'. At that value, only after a user doesn't log in after
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// three weeks (1814400 seconds) will his/her session be removed.
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db_delete('sessions')
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->condition('timestamp', REQUEST_TIME - $lifetime, '<')
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->execute();
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return TRUE;
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}
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/**
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* Determine whether to save session data of the current request.
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*
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* This function allows the caller to temporarily disable writing of
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* session data, should the request end while performing potentially
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* dangerous operations, such as manipulating the global $user object.
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* See http://drupal.org/node/218104 for usage.
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*
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* @param $status
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* Disables writing of session data when FALSE, (re-)enables
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* writing when TRUE.
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*
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* @return
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* FALSE if writing session data has been disabled. Otherwise, TRUE.
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*/
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function drupal_save_session($status = NULL) {
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$save_session = &drupal_static(__FUNCTION__, TRUE);
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if (isset($status)) {
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$save_session = $status;
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}
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return $save_session;
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}
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