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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Multiple plugin authentication Support library
*
* 2006-08-28 File created, AUTH return values defined.
*
* @package core
* @subpackage auth
* @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Returned when the login was successful.
*/
define('AUTH_OK', 0);
/**
* Returned when the login was unsuccessful.
*/
define('AUTH_FAIL', 1);
/**
* Returned when the login was denied (a reason for AUTH_FAIL).
*/
define('AUTH_DENIED', 2);
/**
* Returned when some error occurred (a reason for AUTH_FAIL).
*/
define('AUTH_ERROR', 4);
/**
* Authentication - error codes for user confirm
*/
define('AUTH_CONFIRM_FAIL', 0);
define('AUTH_CONFIRM_OK', 1);
define('AUTH_CONFIRM_ALREADY', 2);
define('AUTH_CONFIRM_ERROR', 3);
# MDL-14055
define('AUTH_REMOVEUSER_KEEP', 0);
define('AUTH_REMOVEUSER_SUSPEND', 1);
define('AUTH_REMOVEUSER_FULLDELETE', 2);
/** Login attempt successful. */
define('AUTH_LOGIN_OK', 0);
/** Can not login because user does not exist. */
define('AUTH_LOGIN_NOUSER', 1);
/** Can not login because user is suspended. */
define('AUTH_LOGIN_SUSPENDED', 2);
/** Can not login, most probably password did not match. */
define('AUTH_LOGIN_FAILED', 3);
/** Can not login because user is locked out. */
define('AUTH_LOGIN_LOCKOUT', 4);
/** Can not login becauser user is not authorised. */
define('AUTH_LOGIN_UNAUTHORISED', 5);
/**
* Abstract authentication plugin.
*
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @package moodlecore
*/
class auth_plugin_base {
/**
* The configuration details for the plugin.
* @var object
*/
var $config;
/**
* Authentication plugin type - the same as db field.
* @var string
*/
var $authtype;
/*
* The fields we can lock and update from/to external authentication backends
* @var array
*/
var $userfields = array(
'firstname',
'lastname',
'email',
'city',
'country',
'lang',
'description',
'url',
'idnumber',
'institution',
'department',
'phone1',
'phone2',
'address',
'firstnamephonetic',
'lastnamephonetic',
'middlename',
'alternatename'
);
/**
* Moodle custom fields to sync with.
* @var array()
*/
var $customfields = null;
/**
* This is the primary method that is used by the authenticate_user_login()
* function in moodlelib.php.
*
* This method should return a boolean indicating
* whether or not the username and password authenticate successfully.
*
* Returns true if the username and password work and false if they are
* wrong or don't exist.
*
* @param string $username The username (with system magic quotes)
* @param string $password The password (with system magic quotes)
*
* @return bool Authentication success or failure.
*/
function user_login($username, $password) {
print_error('mustbeoveride', 'debug', '', 'user_login()' );
}
/**
* Returns true if this authentication plugin can change the users'
* password.
*
* @return bool
*/
function can_change_password() {
//override if needed
return false;
}
/**
* Returns the URL for changing the users' passwords, or empty if the default
* URL can be used.
*
* This method is used if can_change_password() returns true.
* This method is called only when user is logged in, it may use global $USER.
* If you are using a plugin config variable in this method, please make sure it is set before using it,
* as this method can be called even if the plugin is disabled, in which case the config values won't be set.
*
* @return moodle_url url of the profile page or null if standard used
*/
function change_password_url() {
//override if needed
return null;
}
/**
* Returns true if this authentication plugin can edit the users'
* profile.
*
* @return bool
*/
function can_edit_profile() {
//override if needed
return true;
}
/**
* Returns the URL for editing the users' profile, or empty if the default
* URL can be used.
*
* This method is used if can_edit_profile() returns true.
* This method is called only when user is logged in, it may use global $USER.
*
* @return moodle_url url of the profile page or null if standard used
*/
function edit_profile_url() {
//override if needed
return null;
}
/**
* Returns true if this authentication plugin is "internal".
*
* Internal plugins use password hashes from Moodle user table for authentication.
*
* @return bool
*/
function is_internal() {
//override if needed
return true;
}
/**
* Returns false if this plugin is enabled but not configured.
*
* @return bool
*/
public function is_configured() {
return false;
}
/**
* Indicates if password hashes should be stored in local moodle database.
* @return bool true means md5 password hash stored in user table, false means flag 'not_cached' stored there instead
*/
function prevent_local_passwords() {
return !$this->is_internal();
}
/**
* Indicates if moodle should automatically update internal user
* records with data from external sources using the information
* from get_userinfo() method.
*
* @return bool true means automatically copy data from ext to user table
*/
function is_synchronised_with_external() {
return !$this->is_internal();
}
/**
* Updates the user's password.
*
* In previous versions of Moodle, the function
* auth_user_update_password accepted a username as the first parameter. The
* revised function expects a user object.
*
* @param object $user User table object
* @param string $newpassword Plaintext password
*
* @return bool True on success
*/
function user_update_password($user, $newpassword) {
//override if needed
return true;
}
/**
* Called when the user record is updated.
* Modifies user in external database. It takes olduser (before changes) and newuser (after changes)
* compares information saved modified information to external db.
*
* @param mixed $olduser Userobject before modifications (without system magic quotes)
* @param mixed $newuser Userobject new modified userobject (without system magic quotes)
* @return boolean true if updated or update ignored; false if error
*
*/
function user_update($olduser, $newuser) {
//override if needed
return true;
}
/**
* User delete requested - internal user record is mared as deleted already, username not present anymore.
*
* Do any action in external database.
*
* @param object $user Userobject before delete (without system magic quotes)
* @return void
*/
function user_delete($olduser) {
//override if needed
return;
}
/**
* Returns true if plugin allows resetting of internal password.
*
* @return bool
*/
function can_reset_password() {
//override if needed
return false;
}
/**
* Returns true if plugin allows resetting of internal password.
*
* @return bool
*/
function can_signup() {
//override if needed
return false;
}
/**
* Sign up a new user ready for confirmation.
* Password is passed in plaintext.
*
* @param object $user new user object
* @param boolean $notify print notice with link and terminate
*/
function user_signup($user, $notify=true) {
//override when can signup
print_error('mustbeoveride', 'debug', '', 'user_signup()' );
}
/**
* Return a form to capture user details for account creation.
* This is used in /login/signup.php.
* @return moodle_form A form which edits a record from the user table.
*/
function signup_form() {
global $CFG;
require_once($CFG->dirroot.'/login/signup_form.php');
return new login_signup_form(null, null, 'post', '', array('autocomplete'=>'on'));
}
/**
* Returns true if plugin allows confirming of new users.
*
* @return bool
*/
function can_confirm() {
//override if needed
return false;
}
/**
* Confirm the new user as registered.
*
* @param string $username
* @param string $confirmsecret
*/
function user_confirm($username, $confirmsecret) {
//override when can confirm
print_error('mustbeoveride', 'debug', '', 'user_confirm()' );
}
/**
* Checks if user exists in external db
*
* @param string $username (with system magic quotes)
* @return bool
*/
function user_exists($username) {
//override if needed
return false;
}
/**
* return number of days to user password expires
*
* If userpassword does not expire it should return 0. If password is already expired
* it should return negative value.
*
* @param mixed $username username (with system magic quotes)
* @return integer
*/
function password_expire($username) {
return 0;
}
/**
* Sync roles for this user - usually creator
*
* @param $user object user object (without system magic quotes)
*/
function sync_roles($user) {
//override if needed
}
/**
* Read user information from external database and returns it as array().
* Function should return all information available. If you are saving
* this information to moodle user-table you should honour synchronisation flags
*
* @param string $username username
*
* @return mixed array with no magic quotes or false on error
*/
function get_userinfo($username) {
//override if needed
return array();
}
/**
* Prints a form for configuring this authentication plugin.
*
* This function is called from admin/auth.php, and outputs a full page with
* a form for configuring this plugin.
*
* @param object $config
* @param object $err
* @param array $user_fields
*/
function config_form($config, $err, $user_fields) {
//override if needed
}
/**
* A chance to validate form data, and last chance to
* do stuff before it is inserted in config_plugin
* @param object object with submitted configuration settings (without system magic quotes)
* @param array $err array of error messages
*/
function validate_form($form, &$err) {
//override if needed
}
/**
* Processes and stores configuration data for this authentication plugin.
*
* @param object object with submitted configuration settings (without system magic quotes)
*/
function process_config($config) {
//override if needed
return true;
}
/**
* Hook for overriding behaviour of login page.
* This method is called from login/index.php page for all enabled auth plugins.
*
* @global object
* @global object
*/
function loginpage_hook() {
global $frm; // can be used to override submitted login form
global $user; // can be used to replace authenticate_user_login()
//override if needed
}
/**
* Hook for overriding behaviour before going to the login page.
*
* This method is called from require_login from potentially any page for
* all enabled auth plugins and gives each plugin a chance to redirect
* directly to an external login page, or to instantly login a user where
* possible.
*
* If an auth plugin implements this hook, it must not rely on ONLY this
* hook in order to work, as there are many ways a user can browse directly
* to the standard login page. As a general rule in this case you should
* also implement the loginpage_hook as well.
*
*/
function pre_loginpage_hook() {
// override if needed, eg by redirecting to an external login page
// or logging in a user:
// complete_user_login($user);
}
/**
* Pre user_login hook.
* This method is called from authenticate_user_login() right after the user
* object is generated. This gives the auth plugins an option to make adjustments
* before the verification process starts.
*
* @param object $user user object, later used for $USER
*/
public function pre_user_login_hook(&$user) {
// Override if needed.
}
/**
* Post authentication hook.
* This method is called from authenticate_user_login() for all enabled auth plugins.
*
* @param object $user user object, later used for $USER
* @param string $username (with system magic quotes)
* @param string $password plain text password (with system magic quotes)
*/
function user_authenticated_hook(&$user, $username, $password) {
//override if needed
}
/**
* Pre logout hook.
* This method is called from require_logout() for all enabled auth plugins,
*
* @global object
*/
function prelogout_hook() {
global $USER; // use $USER->auth to find the plugin used for login
//override if needed
}
/**
* Hook for overriding behaviour of logout page.
* This method is called from login/logout.php page for all enabled auth plugins.
*
* @global object
* @global string
*/
function logoutpage_hook() {
global $USER; // use $USER->auth to find the plugin used for login
global $redirect; // can be used to override redirect after logout
//override if needed
}
/**
* Hook called before timing out of database session.
* This is useful for SSO and MNET.
*
* @param object $user
* @param string $sid session id
* @param int $timecreated start of session
* @param int $timemodified user last seen
* @return bool true means do not timeout session yet
*/
function ignore_timeout_hook($user, $sid, $timecreated, $timemodified) {
return false;
}
/**
* Return the properly translated human-friendly title of this auth plugin
*
* @todo Document this function
*/
function get_title() {
return get_string('pluginname', "auth_{$this->authtype}");
}
/**
* Get the auth description (from core or own auth lang files)
*
* @return string The description
*/
function get_description() {
$authdescription = get_string("auth_{$this->authtype}description", "auth_{$this->authtype}");
return $authdescription;
}
/**
* Returns whether or not the captcha element is enabled.
*
* @abstract Implement in child classes
* @return bool
*/
function is_captcha_enabled() {
return false;
}
/**
* Returns whether or not this authentication plugin can be manually set
* for users, for example, when bulk uploading users.
*
* This should be overriden by authentication plugins where setting the
* authentication method manually is allowed.
*
* @return bool
* @since Moodle 2.6
*/
function can_be_manually_set() {
// Override if needed.
return false;
}
/**
* Returns a list of potential IdPs that this authentication plugin supports.
* This is used to provide links on the login page.
*
* @param string $wantsurl the relative url fragment the user wants to get to. You can use this to compose a returnurl, for example
*
* @return array like:
* array(
* array(
* 'url' => 'http://someurl',
* 'icon' => new pix_icon(...),
* 'name' => get_string('somename', 'auth_yourplugin'),
* ),
* )
*/
function loginpage_idp_list($wantsurl) {
return array();
}
/**
* Return custom user profile fields.
*
* @return array list of custom fields.
*/
public function get_custom_user_profile_fields() {
global $DB;
// If already retrieved then return.
if (!is_null($this->customfields)) {
return $this->customfields;
}
$this->customfields = array();
if ($proffields = $DB->get_records('user_info_field')) {
foreach ($proffields as $proffield) {
$this->customfields[] = 'profile_field_'.$proffield->shortname;
}
}
unset($proffields);
return $this->customfields;
}
/**
* Post logout hook.
*
* This method is used after moodle logout by auth classes to execute server logout.
*
* @param stdClass $user clone of USER object before the user session was terminated
*/
public function postlogout_hook($user) {
}
}
/**
* Verify if user is locked out.
*
* @param stdClass $user
* @return bool true if user locked out
*/
function login_is_lockedout($user) {
global $CFG;
if ($user->mnethostid != $CFG->mnet_localhost_id) {
return false;
}
if (isguestuser($user)) {
return false;
}
if (empty($CFG->lockoutthreshold)) {
// Lockout not enabled.
return false;
}
if (get_user_preferences('login_lockout_ignored', 0, $user)) {
// This preference may be used for accounts that must not be locked out.
return false;
}
$locked = get_user_preferences('login_lockout', 0, $user);
if (!$locked) {
return false;
}
if (empty($CFG->lockoutduration)) {
// Locked out forever.
return true;
}
if (time() - $locked < $CFG->lockoutduration) {
return true;
}
login_unlock_account($user);
return false;
}
/**
* To be called after valid user login.
* @param stdClass $user
*/
function login_attempt_valid($user) {
global $CFG;
// Note: user_loggedin event is triggered in complete_user_login().
if ($user->mnethostid != $CFG->mnet_localhost_id) {
return;
}
if (isguestuser($user)) {
return;
}
// Always unlock here, there might be some race conditions or leftovers when switching threshold.
login_unlock_account($user);
}
/**
* To be called after failed user login.
* @param stdClass $user
*/
function login_attempt_failed($user) {
global $CFG;
if ($user->mnethostid != $CFG->mnet_localhost_id) {
return;
}
if (isguestuser($user)) {
return;
}
$count = get_user_preferences('login_failed_count', 0, $user);
$last = get_user_preferences('login_failed_last', 0, $user);
$sincescuccess = get_user_preferences('login_failed_count_since_success', $count, $user);
$sincescuccess = $sincescuccess + 1;
set_user_preference('login_failed_count_since_success', $sincescuccess, $user);
if (empty($CFG->lockoutthreshold)) {
// No threshold means no lockout.
// Always unlock here, there might be some race conditions or leftovers when switching threshold.
login_unlock_account($user);
return;
}
if (!empty($CFG->lockoutwindow) and time() - $last > $CFG->lockoutwindow) {
$count = 0;
}
$count = $count+1;
set_user_preference('login_failed_count', $count, $user);
set_user_preference('login_failed_last', time(), $user);
if ($count >= $CFG->lockoutthreshold) {
login_lock_account($user);
}
}
/**
* Lockout user and send notification email.
*
* @param stdClass $user
*/
function login_lock_account($user) {
global $CFG;
if ($user->mnethostid != $CFG->mnet_localhost_id) {
return;
}
if (isguestuser($user)) {
return;
}
if (get_user_preferences('login_lockout_ignored', 0, $user)) {
// This user can not be locked out.
return;
}
$alreadylockedout = get_user_preferences('login_lockout', 0, $user);
set_user_preference('login_lockout', time(), $user);
if ($alreadylockedout == 0) {
$secret = random_string(15);
set_user_preference('login_lockout_secret', $secret, $user);
$oldforcelang = force_current_language($user->lang);
$site = get_site();
$supportuser = core_user::get_support_user();
$data = new stdClass();
$data->firstname = $user->firstname;
$data->lastname = $user->lastname;
$data->username = $user->username;
$data->sitename = format_string($site->fullname);
$data->link = $CFG->wwwroot.'/login/unlock_account.php?u='.$user->id.'&s='.$secret;
$data->admin = generate_email_signoff();
$message = get_string('lockoutemailbody', 'admin', $data);
$subject = get_string('lockoutemailsubject', 'admin', format_string($site->fullname));
if ($message) {
// Directly email rather than using the messaging system to ensure its not routed to a popup or jabber.
email_to_user($user, $supportuser, $subject, $message);
}
force_current_language($oldforcelang);
}
}
/**
* Unlock user account and reset timers.
*
* @param stdClass $user
*/
function login_unlock_account($user) {
unset_user_preference('login_lockout', $user);
unset_user_preference('login_failed_count', $user);
unset_user_preference('login_failed_last', $user);
// Note: do not clear the lockout secret because user might click on the link repeatedly.
}
/**
* Returns whether or not the captcha element is enabled, and the admin settings fulfil its requirements.
* @return bool
*/
function signup_captcha_enabled() {
global $CFG;
$authplugin = get_auth_plugin($CFG->registerauth);
return !empty($CFG->recaptchapublickey) && !empty($CFG->recaptchaprivatekey) && $authplugin->is_captcha_enabled();
}
/**
* Validates the standard sign-up data (except recaptcha that is validated by the form element).
*
* @param array $data the sign-up data
* @param array $files files among the data
* @return array list of errors, being the key the data element name and the value the error itself
* @since Moodle 3.2
*/
function signup_validate_data($data, $files) {
global $CFG, $DB;
$errors = array();
$authplugin = get_auth_plugin($CFG->registerauth);
if ($DB->record_exists('user', array('username' => $data['username'], 'mnethostid' => $CFG->mnet_localhost_id))) {
$errors['username'] = get_string('usernameexists');
} else {
// Check allowed characters.
if ($data['username'] !== core_text::strtolower($data['username'])) {
$errors['username'] = get_string('usernamelowercase');
} else {
if ($data['username'] !== core_user::clean_field($data['username'], 'username')) {
$errors['username'] = get_string('invalidusername');
}
}
}
// Check if user exists in external db.
// TODO: maybe we should check all enabled plugins instead.
if ($authplugin->user_exists($data['username'])) {
$errors['username'] = get_string('usernameexists');
}
if (! validate_email($data['email'])) {
$errors['email'] = get_string('invalidemail');
} else if ($DB->record_exists('user', array('email' => $data['email']))) {
$errors['email'] = get_string('emailexists').' <a href="forgot_password.php">'.get_string('newpassword').'?</a>';
}
if (empty($data['email2'])) {
$errors['email2'] = get_string('missingemail');
} else if ($data['email2'] != $data['email']) {
$errors['email2'] = get_string('invalidemail');
}
if (!isset($errors['email'])) {
if ($err = email_is_not_allowed($data['email'])) {
$errors['email'] = $err;
}
}
$errmsg = '';
if (!check_password_policy($data['password'], $errmsg)) {
$errors['password'] = $errmsg;
}
// Validate customisable profile fields. (profile_validation expects an object as the parameter with userid set).
$dataobject = (object)$data;
$dataobject->id = 0;
$errors += profile_validation($dataobject, $files);
return $errors;
}
/**
* Add the missing fields to a user that is going to be created
*
* @param stdClass $user the new user object
* @return stdClass the user filled
* @since Moodle 3.2
*/
function signup_setup_new_user($user) {
global $CFG;
$user->confirmed = 0;
$user->lang = current_language();
$user->firstaccess = 0;
$user->timecreated = time();
$user->mnethostid = $CFG->mnet_localhost_id;
$user->secret = random_string(15);
$user->auth = $CFG->registerauth;
// Initialize alternate name fields to empty strings.
$namefields = array_diff(get_all_user_name_fields(), useredit_get_required_name_fields());
foreach ($namefields as $namefield) {
$user->$namefield = '';
}
return $user;
}
/**
* Check if user confirmation is enabled on this site and return the auth plugin handling registration if enabled.
*
* @return stdClass the current auth plugin handling user registration or false if registration not enabled
* @since Moodle 3.2
*/
function signup_get_user_confirmation_authplugin() {
global $CFG;
if (empty($CFG->registerauth)) {
return false;
}
$authplugin = get_auth_plugin($CFG->registerauth);
if (!$authplugin->can_confirm()) {
return false;
}
return $authplugin;
}
/**
* Check if sign-up is enabled in the site. If is enabled, the function will return the authplugin instance.
*
* @return mixed false if sign-up is not enabled, the authplugin instance otherwise.
* @since Moodle 3.2
*/
function signup_is_enabled() {
global $CFG;
if (!empty($CFG->registerauth)) {
$authplugin = get_auth_plugin($CFG->registerauth);
if ($authplugin->can_signup()) {
return $authplugin;
}
}
return false;
}