536 rivejä
18 KiB
PHP
536 rivejä
18 KiB
PHP
<?php
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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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* Reads an entire session from the database (internal use only).
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*
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* Also initializes the $user object for the user associated with the session.
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* This function is registered with session_set_save_handler() to support
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* database-backed sessions. It is called on every page load when PHP sets
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* up the $_SESSION superglobal.
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*
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* This function is an internal function and must not be called directly.
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* Doing so may result in logging out the current user, corrupting session data
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* or other unexpected behavior. Session data must always be accessed via the
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* $_SESSION superglobal.
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*
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* @param $sid
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* The session ID of the session to retrieve.
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*
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* @return
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* The user's session, or an empty string if no session exists.
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*/
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function _drupal_session_read($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 (empty($sid) || (!isset($_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' => $user->uid))->fetchAllKeyed(0, 1);
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}
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elseif ($user) {
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// The user is anonymous or blocked. Only preserve two fields from the
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// {sessions} table.
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$account = drupal_anonymous_user();
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$account->session = $user->session;
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$account->timestamp = $user->timestamp;
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$user = $account;
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}
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else {
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// The session has expired.
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$user = drupal_anonymous_user();
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$user->session = '';
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}
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// Store the session that was read for comparison in _drupal_session_write().
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$last_read = &drupal_static('drupal_session_last_read');
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$last_read = array(
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'sid' => $sid,
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'value' => $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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* Writes an entire session to the database (internal use only).
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*
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* This function is registered with session_set_save_handler() to support
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* database-backed sessions.
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*
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* This function is an internal function and must not be called directly.
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* Doing so may result in corrupted session data or other unexpected behavior.
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* Session data must always be accessed via the $_SESSION superglobal.
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*
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* @param $sid
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* The session ID of the session to write to.
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* @param $value
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* Session data to write as a serialized string.
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*
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* @return
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* Always returns TRUE.
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*/
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function _drupal_session_write($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
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// 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 TRUE;
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}
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// Check whether $_SESSION has been changed in this request.
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$last_read = &drupal_static('drupal_session_last_read');
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$is_changed = !isset($last_read) || $last_read['sid'] != $sid || $last_read['value'] !== $value;
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// For performance reasons, do not update the sessions table, unless
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// $_SESSION has changed or more than 180 has passed since the last update.
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if ($is_changed || !isset($user->timestamp) || REQUEST_TIME - $user->timestamp > variable_get('session_write_interval', 180)) {
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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' => $value,
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'timestamp' => REQUEST_TIME,
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);
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// Use the session ID as 'sid' and an empty string as 'ssid' by default.
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// _drupal_session_read() does not allow empty strings so that's a safe
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// default.
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$key = array('sid' => $sid, 'ssid' => '');
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// On HTTPS connections, use the session ID as both 'sid' and 'ssid'.
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if ($is_https) {
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$key['ssid'] = $sid;
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// The "secure pages" setting allows a site to simultaneously use both
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// secure and insecure session cookies. If enabled and both cookies are
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// presented then use both keys.
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if (variable_get('https', FALSE)) {
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$insecure_session_name = substr(session_name(), 1);
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if (isset($_COOKIE[$insecure_session_name])) {
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$key['sid'] = $_COOKIE[$insecure_session_name];
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}
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}
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}
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elseif (variable_get('https', FALSE)) {
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unset($key['ssid']);
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}
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db_merge('sessions')
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->key($key)
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->fields($fields)
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->execute();
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}
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// Likewise, do not update access time more than once per 180 seconds.
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if ($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 $exception) {
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require_once DRUPAL_ROOT . '/includes/errors.inc';
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// If we are displaying errors, then do so with no possibility of a further
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// uncaught exception being thrown.
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if (error_displayable()) {
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print '<h1>Uncaught exception thrown in session handler.</h1>';
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print '<p>' . _drupal_render_exception_safe($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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* Initializes 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, $is_https;
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session_set_save_handler('_drupal_session_open', '_drupal_session_close', '_drupal_session_read', '_drupal_session_write', '_drupal_session_destroy', '_drupal_session_garbage_collection');
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// We use !empty() in the following check to ensure that blank session IDs
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// are not valid.
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if (!empty($_COOKIE[session_name()]) || ($is_https && variable_get('https', FALSE) && !empty($_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($_SESSION)) {
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drupal_page_is_cacheable(FALSE);
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}
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}
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else {
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// Set a session identifier for this request. This is necessary because
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// we lazily start sessions at the end of this request, and some
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// processes (like drupal_get_token()) needs to know the future
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// session ID in advance.
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$GLOBALS['lazy_session'] = TRUE;
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$user = drupal_anonymous_user();
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// Less random sessions (which are much faster to generate) are used for
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// anonymous users than are generated in drupal_session_regenerate() when
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// a user becomes authenticated.
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session_id(drupal_random_key());
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if ($is_https && variable_get('https', FALSE)) {
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$insecure_session_name = substr(session_name(), 1);
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$session_id = drupal_random_key();
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$_COOKIE[$insecure_session_name] = $session_id;
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}
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}
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date_default_timezone_set(drupal_get_user_timezone());
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}
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/**
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* Starts a session forcefully, preserving already set session data.
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*
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* @ingroup php_wrappers
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*/
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function drupal_session_start() {
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// Command line clients do not support cookies nor sessions.
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if (!drupal_session_started() && !drupal_is_cli()) {
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// Save current session data before starting it, as PHP will destroy it.
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$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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* Commits 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, $is_https;
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if (!drupal_save_session()) {
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// We don't have anything to do if we are not allowed to save the session.
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return;
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}
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if (empty($user->uid) && empty($_SESSION)) {
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// There is no session data to store, destroy the session if it was
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// previously started.
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if (drupal_session_started()) {
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session_destroy();
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}
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}
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else {
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// There is session data to store. Start the session if it is not already
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// started.
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if (!drupal_session_started()) {
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drupal_session_start();
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if ($is_https && variable_get('https', FALSE)) {
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$insecure_session_name = substr(session_name(), 1);
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$params = session_get_cookie_params();
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$expire = $params['lifetime'] ? REQUEST_TIME + $params['lifetime'] : 0;
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setcookie($insecure_session_name, $_COOKIE[$insecure_session_name], $expire, $params['path'], $params['domain'], FALSE, $params['httponly']);
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}
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}
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// Write the session data.
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session_write_close();
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}
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}
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/**
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* Returns whether a session has been started.
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*/
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function drupal_session_started($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, $is_https;
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// Nothing to do if we are not allowed to change the session.
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if (!drupal_save_session()) {
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return;
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}
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if ($is_https && variable_get('https', FALSE)) {
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$insecure_session_name = substr(session_name(), 1);
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if (!isset($GLOBALS['lazy_session']) && 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_random_key();
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// If a session cookie lifetime is set, the session will expire
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// $params['lifetime'] seconds from the current request. If it is not set,
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// it will expire when the browser is closed.
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$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_random_key());
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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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/**
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* Session handler assigned by session_set_save_handler().
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*
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* Cleans up 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, $is_https;
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// Nothing to do if we are not allowed to change the session.
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if (!drupal_save_session()) {
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return TRUE;
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}
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// Delete session data.
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db_delete('sessions')
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->condition($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), FALSE);
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}
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elseif (variable_get('https', FALSE)) {
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_drupal_session_delete_cookie('S' . session_name(), TRUE);
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}
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return TRUE;
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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 boolean $secure
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* Force the secure value of the cookie.
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*/
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function _drupal_session_delete_cookie($name, $secure = NULL) {
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global $is_https;
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if (isset($_COOKIE[$name]) || (!$is_https && $secure === TRUE)) {
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$params = session_get_cookie_params();
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if ($secure !== NULL) {
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$params['secure'] = $secure;
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}
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setcookie($name, '', REQUEST_TIME - 3600, $params['path'], $params['domain'], $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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/**
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* Ends 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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// Nothing to do if we are not allowed to change the session.
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if (!drupal_save_session()) {
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return;
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}
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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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|
|
/**
|
|
* Session handler assigned by session_set_save_handler().
|
|
*
|
|
* Cleans up stalled sessions.
|
|
*
|
|
* @param $lifetime
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|
* The value of session.gc_maxlifetime, passed by PHP.
|
|
* Sessions not updated for more than $lifetime seconds will be removed.
|
|
*/
|
|
function _drupal_session_garbage_collection($lifetime) {
|
|
// Be sure to adjust 'php_value session.gc_maxlifetime' to a large enough
|
|
// value. For example, if you want user sessions to stay in your database
|
|
// for three weeks before deleting them, you need to set gc_maxlifetime
|
|
// to '1814400'. At that value, only after a user doesn't log in after
|
|
// three weeks (1814400 seconds) will his/her session be removed.
|
|
db_delete('sessions')
|
|
->condition('timestamp', REQUEST_TIME - $lifetime, '<')
|
|
->execute();
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* Determines whether to save session data of the current request.
|
|
*
|
|
* This function allows the caller to temporarily disable writing of
|
|
* session data, should the request end while performing potentially
|
|
* dangerous operations, such as manipulating the global $user object.
|
|
* See http://drupal.org/node/218104 for usage.
|
|
*
|
|
* @param $status
|
|
* Disables writing of session data when FALSE, (re-)enables
|
|
* writing when TRUE.
|
|
*
|
|
* @return
|
|
* FALSE if writing session data has been disabled. Otherwise, TRUE.
|
|
*/
|
|
function drupal_save_session($status = NULL) {
|
|
// PHP session ID, session, and cookie handling happens in the global scope.
|
|
// This value has to persist across calls to drupal_static_reset(), since a
|
|
// potentially wrong or disallowed session would be written otherwise.
|
|
static $save_session = TRUE;
|
|
if (isset($status)) {
|
|
$save_session = $status;
|
|
}
|
|
return $save_session;
|
|
}
|