From d4cd72e032ff3897640c2bdc508a7f802852164f Mon Sep 17 00:00:00 2001
From: Valentin Popov <info@valentineus.link>
Date: Mon, 14 Aug 2017 14:26:10 +0400
Subject: Initial commit

---
 auth.php | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 auth.php

(limited to 'auth.php')

diff --git a/auth.php b/auth.php
new file mode 100644
index 0000000..dfbd2d6
--- /dev/null
+++ b/auth.php
@@ -0,0 +1,172 @@
+<?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);
+    }
+}
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