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-rw-r--r--auth.php172
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+<?php
+/**
+ * HTTP Basic Authentication.
+ * @package auth_http
+ * @copyright "Valentin Popov" <info@valentineus.link>
+ * @license MIT License (https://opensource.org/licenses/MIT)
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+require_once($CFG->libdir.'/authlib.php');
+
+/**
+ * Plugin for no authentication.
+ */
+class auth_plugin_http extends auth_plugin_base {
+
+ /**
+ * Constructor.
+ */
+ public function __construct() {
+ $this->authtype = 'http';
+ }
+
+ /**
+ * Old syntax of class constructor. Deprecated in PHP7.
+ * @deprecated since Moodle 3.1
+ */
+ public function auth_plugin_http() {
+ debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
+ self::__construct();
+ }
+
+ /**
+ * Returns true if the username and password work or don't exist and false
+ * if the user exists and the password is wrong.
+ * @param string $username The username
+ * @param string $password The password
+ * @return bool Authentication success or failure.
+ */
+ function user_login($username, $password) {
+ global $CFG, $DB;
+
+ if ($user = $DB->get_record('user', array('username'=>$username, 'mnethostid'=>$CFG->mnet_localhost_id))) {
+ return validate_internal_user_password($user, $password);
+ }
+
+ return true;
+ }
+
+ /**
+ * No password updates.
+ */
+ function user_update_password($user, $newpassword) {
+ return false;
+ }
+
+ function prevent_local_passwords() {
+ // just in case, we do not want to loose the passwords
+ return false;
+ }
+
+ /**
+ * Returns true if this authentication plugin is 'internal'.
+ * @return bool
+ */
+ function is_internal() {
+ //we do not know if it was internal or external originally
+ return true;
+ }
+
+ /**
+ * No changing of password.
+ */
+ function can_change_password() {
+ return false;
+ }
+
+ /**
+ * Returns the URL for changing the user's pw, or empty if the default can
+ * be used.
+ * @return moodle_url
+ */
+ function change_password_url() {
+ return null;
+ }
+
+ /**
+ * No password resetting.
+ */
+ function can_reset_password() {
+ return true;
+ }
+
+ /**
+ * Returns true if plugin can be manually set.
+ * @return bool
+ */
+ function can_be_manually_set() {
+ return true;
+ }
+
+ /**
+ * Hook for overriding behaviour before going to the login page.
+ */
+ function pre_loginpage_hook() {
+ $this->loginpage_hook();
+ }
+
+ /**
+ * Hook for overriding behaviour of login page.
+ */
+ function loginpage_hook() {
+ global $DB;
+
+ if (!isloggedin()) {
+ if (isset($_SERVER['PHP_AUTH_USER']) &&
+ isset($_SERVER['PHP_AUTH_PW'])) {
+
+ $username = htmlspecialchars($_SERVER['PHP_AUTH_USER']);
+ $password = htmlspecialchars($_SERVER['PHP_AUTH_PW']);
+
+ // User existence check
+ if ($user = $DB->get_record( 'user', array( 'username' => $username) )) {
+
+ // Verification of authorization data
+ if (validate_internal_user_password($user, $password)) {
+ complete_user_login($user);
+ $this->redirect_user();
+ } else {
+ // Authentication data verification error
+ $this->authorization_window();
+ }
+ } else {
+ // User search failed
+ $this->authorization_window();
+ }
+ } else {
+ // Authorization data is missing
+ $this->authorization_window();
+ }
+ }
+ }
+
+ /**
+ * Call authorization window.
+ */
+ function authorization_window() {
+ global $SITE;
+
+ header('WWW-Authenticate: Basic realm="'. $SITE->shortname .'"');
+ header('HTTP/1.0 401 Unauthorized');
+ die(print_string('auth_httperror', 'auth_http'));
+ }
+
+ /**
+ * Redirect client to the original target.
+ */
+ function redirect_user() {
+ global $CFG, $SESSION;
+
+ if (isset($SESSION->wantsurl)) {
+ $redirect = $SESSION->wantsurl;
+ } elseif (isset($_GET['wantsurl'])) {
+ $redirect = htmlspecialchars($_GET['wantsurl']);
+ } else {
+ $redirect = $CFG->wwwroot;
+ }
+
+ redirect($redirect);
+ }
+}