626 lines
17 KiB
PHP
626 lines
17 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* User key auth method.
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*
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* @package auth_userkey
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* @copyright 2016 Dmitrii Metelkin (dmitriim@catalyst-au.net)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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use auth_userkey\core_userkey_manager;
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use auth_userkey\userkey_manager_interface;
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require_once($CFG->libdir . "/externallib.php");
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require_once($CFG->libdir.'/authlib.php');
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require_once($CFG->dirroot . '/user/lib.php');
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/**
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* User key authentication plugin.
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*/
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class auth_plugin_userkey extends auth_plugin_base {
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/**
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* Default mapping field.
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*/
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const DEFAULT_MAPPING_FIELD = 'email';
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/**
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* User key manager.
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*
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* @var userkey_manager_interface
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*/
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protected $userkeymanager;
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/**
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* Defaults for config form.
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*
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* @var array
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*/
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protected $defaults = array(
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'mappingfield' => self::DEFAULT_MAPPING_FIELD,
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'keylifetime' => 60,
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'iprestriction' => 0,
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'ipwhitelist' => '',
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'redirecturl' => '',
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'ssourl' => '',
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'createuser' => false,
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'updateuser' => false,
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);
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/**
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* Constructor.
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*/
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public function __construct() {
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$this->authtype = 'userkey';
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$this->config = get_config('auth_userkey');
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$this->userkeymanager = new core_userkey_manager($this->config);
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}
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/**
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* All the checking happens before the login page in this hook.
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*
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* It redirects a user if required or return true.
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*/
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public function pre_loginpage_hook() {
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global $SESSION;
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// If we previously tried to skip SSO on, but then navigated
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// away, and come in from another deep link while SSO only is
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// on, then reset the previous session memory of forcing SSO.
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if (isset($SESSION->enrolkey_skipsso)) {
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unset($SESSION->enrolkey_skipsso);
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}
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return $this->loginpage_hook();
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}
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/**
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* All the checking happens before the login page in this hook.
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*
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* It redirects a user if required or return true.
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*/
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public function loginpage_hook() {
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if ($this->should_login_redirect()) {
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$this->redirect($this->config->ssourl);
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}
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return true;
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}
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/**
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* Redirects the user to provided URL.
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*
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* @param $url URL to redirect to.
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*
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* @throws \moodle_exception If gets running via CLI or AJAX call.
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*/
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protected function redirect($url) {
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if (CLI_SCRIPT or AJAX_SCRIPT) {
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throw new moodle_exception('redirecterrordetected', 'auth_userkey', '', $url);
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}
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redirect($url);
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}
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/**
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* Don't allow login using login form.
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*
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* @param string $username The username (with system magic quotes)
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* @param string $password The password (with system magic quotes)
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*
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* @return bool Authentication success or failure.
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*/
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public function user_login($username, $password) {
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return false;
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}
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/**
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* Logs a user in using userkey and redirects after.
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*
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* @throws \moodle_exception If something went wrong.
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*/
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public function user_login_userkey() {
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global $SESSION, $CFG;
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$keyvalue = required_param('key', PARAM_ALPHANUM);
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$wantsurl = optional_param('wantsurl', '', PARAM_URL);
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if (!empty($wantsurl)) {
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$redirecturl = $wantsurl;
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} else {
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$redirecturl = $CFG->wwwroot;
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}
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$key = $this->userkeymanager->validate_key($keyvalue);
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if (isloggedin()) {
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if ($SESSION->userid != $key->userid) {
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require_logout();
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$this->user_login_userkey();
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}
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}
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$this->userkeymanager->delete_keys($key->userid);
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$user = get_complete_user_data('id', $key->userid);
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complete_user_login($user);
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// Identify this session as using user key auth method.
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$SESSION->userkey = true;
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$this->redirect($redirecturl);
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}
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/**
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* Don't store local passwords.
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*
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* @return bool True.
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*/
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public function prevent_local_passwords() {
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return true;
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}
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/**
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* Returns true if this authentication plugin is external.
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*
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* @return bool False.
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*/
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public function is_internal() {
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return false;
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}
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/**
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* The plugin can't change the user's password.
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*
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* @return bool False.
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*/
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public function can_change_password() {
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return false;
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}
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/**
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* Set userkey manager.
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*
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* This function is the only way to inject dependency, because of the way auth plugins work.
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*
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* @param \auth_userkey\userkey_manager_interface $keymanager
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*/
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public function set_userkey_manager(userkey_manager_interface $keymanager) {
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$this->userkeymanager = $keymanager;
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}
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/**
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* Return mapping field to find a lms user.
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*
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* @return string
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*/
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public function get_mapping_field() {
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if (isset($this->config->mappingfield) && !empty($this->config->mappingfield)) {
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return $this->config->mappingfield;
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}
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return self::DEFAULT_MAPPING_FIELD;
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}
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/**
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* Check if we need to create a new user.
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*
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* @return bool
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*/
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protected function should_create_user() {
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if (isset($this->config->createuser) && $this->config->createuser == true) {
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return true;
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}
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return false;
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}
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/**
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* Check if we need to update users.
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*
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* @return bool
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*/
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protected function should_update_user() {
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if (isset($this->config->updateuser) && $this->config->updateuser == true) {
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return true;
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}
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return false;
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}
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/**
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* Check if restriction by IP is enabled.
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*
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* @return bool
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*/
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protected function is_ip_restriction_enabled() {
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if (isset($this->config->iprestriction) && $this->config->iprestriction == true) {
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return true;
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}
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return false;
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}
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/**
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* Create a new user.
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*
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* @param array $data Validated user data from web service.
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*
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* @return object User object.
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*/
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protected function create_user(array $data) {
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global $DB, $CFG;
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$user = $data;
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unset($user['ip']);
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$user['auth'] = 'userkey';
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$user['confirmed'] = 1;
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$user['mnethostid'] = $CFG->mnet_localhost_id;
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$requiredfieds = ['username', 'email', 'firstname', 'lastname'];
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$missingfields = [];
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foreach ($requiredfieds as $requiredfied) {
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if (empty($user[$requiredfied])) {
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$missingfields[] = $requiredfied;
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}
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}
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if (!empty($missingfields)) {
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throw new invalid_parameter_exception('Unable to create user, missing value(s): ' . implode(',', $missingfields));
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}
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if ($DB->record_exists('user', array('username' => $user['username'], 'mnethostid' => $CFG->mnet_localhost_id))) {
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throw new invalid_parameter_exception('Username already exists: '.$user['username']);
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}
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if (!validate_email($user['email'])) {
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throw new invalid_parameter_exception('Email address is invalid: '.$user['email']);
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} else if (empty($CFG->allowaccountssameemail) &&
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$DB->record_exists('user', array('email' => $user['email'], 'mnethostid' => $user['mnethostid']))) {
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throw new invalid_parameter_exception('Email address already exists: '.$user['email']);
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}
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$userid = user_create_user($user);
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return $DB->get_record('user', ['id' => $userid]);
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}
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/**
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* Update an existing user.
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*
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* @param stdClass $user Existing user record.
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* @param array $data Validated user data from web service.
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*
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* @return object User object.
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*/
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protected function update_user(\stdClass $user, array $data) {
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global $DB, $CFG;
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$userdata = $data;
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unset($userdata['ip']);
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$userdata['auth'] = 'userkey';
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$changed = false;
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foreach ($userdata as $key => $value) {
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if ($user->$key != $value) {
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$changed = true;
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break;
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}
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}
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if (!$changed) {
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return $user;
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}
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if (
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$user->username != $userdata['username']
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&&
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$DB->record_exists('user', array('username' => $userdata['username'], 'mnethostid' => $CFG->mnet_localhost_id))
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) {
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throw new invalid_parameter_exception('Username already exists: '.$userdata['username']);
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}
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if (!validate_email($userdata['email'])) {
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throw new invalid_parameter_exception('Email address is invalid: '.$userdata['email']);
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} else if (
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empty($CFG->allowaccountssameemail)
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&&
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$user->email != $userdata['email']
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&&
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$DB->record_exists('user', array('email' => $userdata['email'], 'mnethostid' => $CFG->mnet_localhost_id))
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) {
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throw new invalid_parameter_exception('Email address already exists: '.$userdata['email']);
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}
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$userdata['id'] = $user->id;
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$userdata = (object) $userdata;
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user_update_user($userdata, false);
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return $DB->get_record('user', ['id' => $user->id]);
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}
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/**
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* Validate user data from web service.
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*
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* @param mixed $data User data from web service.
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*
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* @return array
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*
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* @throws \invalid_parameter_exception If provided data is invalid.
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*/
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protected function validate_user_data($data) {
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$data = (array)$data;
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$mappingfield = $this->get_mapping_field();
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if (!isset($data[$mappingfield]) || empty($data[$mappingfield])) {
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throw new invalid_parameter_exception('Required field "' . $mappingfield . '" is not set or empty.');
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}
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if ($this->is_ip_restriction_enabled() && !isset($data['ip'])) {
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throw new invalid_parameter_exception('Required parameter "ip" is not set.');
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}
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return $data;
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}
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/**
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* Return user object.
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*
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* @param array $data Validated user data.
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*
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* @return object A user object.
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*
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* @throws \invalid_parameter_exception If user is not exist and we don't need to create a new.
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*/
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protected function get_user(array $data) {
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global $DB, $CFG;
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$mappingfield = $this->get_mapping_field();
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$params = array(
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$mappingfield => $data[$mappingfield],
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'mnethostid' => $CFG->mnet_localhost_id,
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);
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$user = $DB->get_record('user', $params);
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if (empty($user)) {
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if ($this->should_create_user()) {
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$user = $this->create_user($data);
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} else {
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throw new invalid_parameter_exception('User is not exist');
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}
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} else if ($this->should_update_user()) {
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$user = $this->update_user($user, $data);
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}
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return $user;
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}
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/**
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* Return allowed IPs from user data.
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*
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* @param array $data Validated user data.
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*
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* @return null|string Allowed IPs or null.
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*/
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protected function get_allowed_ips(array $data) {
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if (isset($data['ip']) && !empty($data['ip'])) {
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return $data['ip'];
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}
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return null;
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}
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/**
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* Generate login user key.
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*
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* @param array $data Validated user data.
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*
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* @return string
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* @throws \invalid_parameter_exception
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*/
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protected function generate_user_key(array $data) {
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$user = $this->get_user($data);
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$ips = $this->get_allowed_ips($data);
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return $this->userkeymanager->create_key($user->id, $ips);
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}
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/**
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* Return login URL.
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*
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* @param array|stdClass $data User data from web service.
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*
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* @return string Login URL.
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*
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* @throws \invalid_parameter_exception
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*/
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public function get_login_url($data) {
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global $CFG;
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$userdata = $this->validate_user_data($data);
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$userkey = $this->generate_user_key($userdata);
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return $CFG->wwwroot . '/auth/userkey/login.php?key=' . $userkey;
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}
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/**
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* Return a list of mapping fields.
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*
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* @return array
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*/
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public function get_allowed_mapping_fields() {
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return array(
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'username' => get_string('username'),
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'email' => get_string('email'),
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'idnumber' => get_string('idnumber'),
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);
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}
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/**
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* Return a mapping parameter for request_login_url_parameters().
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*
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* @return array
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*/
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protected function get_mapping_parameter() {
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$mappingfield = $this->get_mapping_field();
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switch ($mappingfield) {
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case 'username':
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$parameter = array(
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'username' => new external_value(
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PARAM_USERNAME,
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'Username'
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),
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);
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break;
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case 'email':
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$parameter = array(
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'email' => new external_value(
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PARAM_EMAIL,
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'A valid email address'
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),
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);
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break;
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case 'idnumber':
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$parameter = array(
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'idnumber' => new external_value(
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PARAM_RAW,
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'An arbitrary ID code number perhaps from the institution'
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),
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);
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break;
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default:
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$parameter = array();
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break;
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}
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return $parameter;
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}
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/**
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* Return user fields parameters for request_login_url_parameters().
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*
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* @return array
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*/
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protected function get_user_fields_parameters() {
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$parameters = array();
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if ($this->is_ip_restriction_enabled()) {
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$parameters['ip'] = new external_value(
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PARAM_HOST,
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'User IP address'
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);
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}
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$mappingfield = $this->get_mapping_field();
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if ($this->should_create_user() || $this->should_update_user()) {
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$parameters['firstname'] = new external_value(PARAM_NOTAGS, 'The first name(s) of the user', VALUE_OPTIONAL);
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$parameters['lastname'] = new external_value(PARAM_NOTAGS, 'The family name of the user', VALUE_OPTIONAL);
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if ($mappingfield != 'email') {
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$parameters['email'] = new external_value(PARAM_RAW_TRIMMED, 'A valid and unique email address', VALUE_OPTIONAL);
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}
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if ($mappingfield != 'username') {
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$parameters['username'] = new external_value(PARAM_USERNAME, 'A valid and unique username', VALUE_OPTIONAL);
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}
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}
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return $parameters;
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}
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/**
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* Return parameters for request_login_url_parameters().
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*
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* @return array
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*/
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public function get_request_login_url_user_parameters() {
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$parameters = array_merge($this->get_mapping_parameter(), $this->get_user_fields_parameters());
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return $parameters;
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}
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/**
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* Check if we should redirect a user as part of login.
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*
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* @return bool
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*/
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protected function should_login_redirect() {
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global $SESSION;
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$skipsso = optional_param('enrolkey_skipsso', 0, PARAM_BOOL);
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// Check whether we've skipped SSO already.
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// This is here because loginpage_hook is called again during form
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// submission (all of login.php is processed) and ?skipsso=on is not
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// preserved forcing us to the SSO.
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if ((isset($SESSION->enrolkey_skipsso) && $SESSION->enrolkey_skipsso == 1)) {
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return false;
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}
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$SESSION->enrolkey_skipsso = $skipsso;
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// If SSO only is set and user is not passing the skip param
|
|
// or has it already set in their session then redirect to the SSO URL.
|
|
if (isset($this->config->ssourl) && $this->config->ssourl != '' && !$skipsso) {
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Check if we should redirect a user after logout.
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function should_logout_redirect() {
|
|
global $SESSION;
|
|
|
|
if (!isset($SESSION->userkey)) {
|
|
return false;
|
|
}
|
|
|
|
if (!isset($this->config->redirecturl)) {
|
|
return false;
|
|
}
|
|
|
|
if (empty($this->config->redirecturl)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Logout page hook.
|
|
*
|
|
* Override redirect URL after logout.
|
|
*
|
|
* @see auth_plugin_base::logoutpage_hook()
|
|
*/
|
|
public function logoutpage_hook() {
|
|
global $redirect;
|
|
|
|
if ($this->should_logout_redirect()) {
|
|
$redirect = $this->config->redirecturl;
|
|
}
|
|
}
|
|
}
|