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262 lines
12 KiB
262 lines
12 KiB
<?php
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use \ChamiloSession as Session;
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/* For licensing terms, see /license.txt */
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/**
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* This file contains the necessary elements to implement a Single Sign On
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* mechanism with an external Drupal application (on which the Chamilo module
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* 7.x-1.0-alpha3 or above must be implemented)
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*
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* To use this class, set variable "sso_authentication_subclass" to "Drupal"
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* in Chamilo settings. If not yet available in the "Security" tab, execute the
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* following on the Chamilo database:
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* INSERT INTO `settings_current` (`variable`, `type`, `category`, `selected_value`, `title`, `comment`, `access_url`)
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* VALUES ('sso_authentication_subclass', 'textfield', 'Security', 'Drupal', 'SSOSubclass', 'SSOSubclassComment', 1);
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*
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* @package chamilo.auth.sso
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*/
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/**
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* The SSO class allows for management of remote Single Sign On resources
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*/
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class ssoDrupal {
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public $protocol; // 'http://',
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public $domain; // 'localhost/project/drupal',
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public $auth_uri; // '/?q=user',
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public $deauth_uri; // '/?q=logout',
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public $referer; // http://my.chamilo.com/main/auth/profile.php
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/**
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* Instanciates the object, initializing all relevant URL strings
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*/
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public function __construct() {
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$this->protocol = api_get_setting('sso_authentication_protocol');
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// There can be multiple domains, so make sure to take only the first
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// This might be later extended with a decision process
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$domains = split(',',api_get_setting('sso_authentication_domain'));
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$this->domain = trim($domains[0]);
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$this->auth_uri = api_get_setting('sso_authentication_auth_uri');
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$this->deauth_uri = api_get_setting('sso_authentication_unauth_uri');
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//cut the string to avoid recursive URL construction in case of failure
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$this->referer = $this->protocol.$_SERVER['HTTP_HOST'].substr($_SERVER['REQUEST_URI'],0,strpos($_SERVER['REQUEST_URI'],'sso'));
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$this->deauth_url = $this->protocol.$this->domain.$this->deauth_uri;
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$this->master_url = $this->protocol.$this->domain.$this->auth_uri;
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$this->target = api_get_path(WEB_PATH);
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}
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/**
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* Unlogs the user from the remote server
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*/
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public function logout() {
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header('Location: '.$this->deauth_url);
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exit;
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}
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/**
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* Sends the user to the master URL for a check of active connection
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*/
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public function ask_master() {
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// Generate a single usage token that must be encoded by the master
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$_SESSION['sso_challenge'] = api_generate_password(48);
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// Redirect browser to the master URL
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$params = 'sso_referer='.urlencode($this->referer).'&sso_target='.urlencode($this->target).'&sso_challenge='.urlencode($_SESSION['sso_challenge']);
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if (strpos($this->master_url, "?") === false) {
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$params = "?{$params}";
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} else {
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$params = "&{$params}";
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}
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header('Location: '.$this->master_url.$params);
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exit;
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}
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/**
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* Validates the received active connection data with the database
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* @return bool Return the loginFailed variable value to local.inc.php
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*/
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public function check_user() {
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global $_user;
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$loginFailed = false;
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//change the way we recover the cookie depending on how it is formed
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$sso = $this->decode_cookie($_GET['sso_cookie']);
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//get token that should have been used and delete it
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//from session since it can only be used once
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$sso_challenge = '';
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if (isset($_SESSION['sso_challenge'])) {
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$sso_challenge = $_SESSION['sso_challenge'];
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unset($_SESSION['sso_challenge']);
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}
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//lookup the user in the main database
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$user_table = Database::get_main_table(TABLE_MAIN_USER);
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$sql = "SELECT user_id, username, password, auth_source, active, expiration_date, status
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FROM $user_table
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WHERE username = '".trim(Database::escape_string($sso['username']))."'";
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$result = Database::query($sql);
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if (Database::num_rows($result) > 0) {
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$uData = Database::fetch_array($result);
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//Check the user's password
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if ($uData['auth_source'] == PLATFORM_AUTH_SOURCE) {
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if ($sso['secret'] === sha1($uData['username'].$sso_challenge.api_get_security_key())
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&& ($sso['username'] == $uData['username'])) {
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//Check if the account is active (not locked)
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if ($uData['active']=='1') {
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// check if the expiration date has not been reached
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if ($uData['expiration_date'] > date('Y-m-d H:i:s') OR $uData['expiration_date']=='0000-00-00 00:00:00') {
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//If Multiple URL is enabled
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if (api_get_multiple_access_url()) {
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//Check the access_url configuration setting if the user is registered in the access_url_rel_user table
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//Getting the current access_url_id of the platform
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$current_access_url_id = api_get_current_access_url_id();
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// my user is subscribed in these
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//sites: $my_url_list
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$my_url_list = api_get_access_url_from_user($uData['user_id']);
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} else {
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$current_access_url_id = 1;
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$my_url_list = array(1);
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}
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$my_user_is_admin = UserManager::is_admin($uData['user_id']);
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if ($my_user_is_admin === false) {
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if (is_array($my_url_list) && count($my_url_list) > 0 ) {
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if (in_array($current_access_url_id, $my_url_list)) {
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// the user has permission to enter at this site
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$_user['user_id'] = $uData['user_id'];
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$_user = api_get_user_info($_user['user_id']);
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Session::write('_user', $_user);
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Event::event_login();
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// Redirect to homepage
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$sso_target = isset($sso['target']) ? $sso['target'] : api_get_path(WEB_PATH) . 'index.php';
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header('Location: '. $sso_target);
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exit;
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} else {
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// user does not have permission for this site
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=access_url_inactive');
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exit;
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}
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} else {
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// there is no URL in the multiple
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// urls list for this user
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=access_url_inactive');
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exit;
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}
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} else {
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//Only admins of the "main" (first) Chamilo
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// portal can login wherever they want
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if (in_array(1, $my_url_list)) {
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//Check if this admin is admin on the
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// principal portal
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$_user['user_id'] = $uData['user_id'];
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$_user = api_get_user_info($_user['user_id']);
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$is_platformAdmin = $uData['status'] == COURSEMANAGER;
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Session::write('is_platformAdmin', $is_platformAdmin);
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Session::write('_user', $_user);
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Event::event_login();
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} else {
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//Secondary URL admin wants to login
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// so we check as a normal user
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if (in_array($current_access_url_id, $my_url_list)) {
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$_user['user_id'] = $uData['user_id'];
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$_user = api_get_user_info($_user['user_id']);
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Session::write('_user',$_user);
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Event::event_login();
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} else {
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=access_url_inactive');
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exit;
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}
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}
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}
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} else {
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// user account expired
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=account_expired');
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exit;
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}
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} else {
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//User not active
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=account_inactive');
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exit;
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}
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} else {
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//SHA1 of password is wrong
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=wrong_password');
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exit;
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}
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} else {
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//Auth_source is wrong
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=wrong_authentication_source');
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exit;
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}
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} else {
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//No user by that login
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$loginFailed = true;
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Session::erase('_uid');
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header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=user_not_found');
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exit;
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}
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return $loginFailed;
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}
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/**
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* Decode the cookie (this function may vary depending on the
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* Single Sign On implementation
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* @param string Encoded cookie
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* @return array Parsed and unencoded cookie
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*/
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private function decode_cookie($cookie) {
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return unserialize(base64_decode($cookie));
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}
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/**
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* Generate the URL for profile editing for a any user or the current user
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* @param int $userId Optional. The user id
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* @param boolean $asAdmin Optional. Whether get the URL for the platform admin
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* @return string If the URL is obtained return the drupal_user_id. Otherwise return false
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*/
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public function generateProfileEditingURL($userId = 0, $asAdmin = false)
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{
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$userId = intval($userId);
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if (empty($userId)) {
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$userId = api_get_user_id();
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}
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$userExtraFieldValue = new ExtraFieldValue('user');
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$drupalUserIdData = $userExtraFieldValue->get_values_by_handler_and_field_variable($userId, 'drupal_user_id');
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// If this is an administrator, allow him to make some changes in
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// the Chamilo profile
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if ($asAdmin && api_is_platform_admin(true)) {
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return api_get_path(WEB_CODE_PATH) . "admin/user_edit.php?user_id=$userId";
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}
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// If the user doesn't match a Drupal user, give the normal profile
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// link
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if ($drupalUserIdData === false) {
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return api_get_path(WEB_CODE_PATH) . 'auth/profile.php';
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}
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// In all other cases, generate a link to the Drupal profile edition
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$drupalUserId = $drupalUserIdData['field_value'];
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$url = "{$this->protocol}{$this->domain}/user/{$drupalUserId}/edit";
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return $url;
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}
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}
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