forked from friendica/friendica-addons
429 lines
14 KiB
PHP
Executable file
429 lines
14 KiB
PHP
Executable file
<?php
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/*
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* Name: SAML SSO and SLO
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* Description: replace login and registration with a SAML identity provider.
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* Version: 0.0
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* Author: Ryan <https://friendica.verya.pe/profile/ryan>
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*/
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use Friendica\Core\Hook;
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use Friendica\Core\Logger;
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use Friendica\Core\Renderer;
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use Friendica\Core\Session;
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use Friendica\Database\DBA;
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use Friendica\DI;
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use Friendica\Model\User;
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use Friendica\Util\Strings;
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use OneLogin\Saml2\Auth;
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require_once(__DIR__ . '/vendor/autoload.php');
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define("PW_LEN", 32); // number of characters to use for random passwords
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function saml_module($a) {}
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function saml_init($a) {
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if ($a->argc < 2) return;
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switch ($a->argv[1]) {
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case "metadata.xml":
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saml_metadata();
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break;
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case "sso":
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saml_sso_reply($a);
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break;
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case "slo":
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saml_slo_reply();
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break;
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case "moo":
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echo DI::baseUrl();
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echo $_SERVER['REQUEST_URI'];
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break;
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}
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exit();
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}
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function saml_metadata() {
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try {
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$settings = new \OneLogin\Saml2\Settings(saml_settings());
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$metadata = $settings->getSPMetadata();
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$errors = $settings->validateMetadata($metadata);
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if (empty($errors)) {
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header('Content-Type: text/xml');
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echo $metadata;
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} else {
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throw new \OneLogin\Saml2\Error(
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'Invalid SP metadata: '.implode(', ', $errors),
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\OneLogin\Saml2\Error::METADATA_SP_INVALID
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);
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}
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} catch (Exception $e) {
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Logger::error($e->getMessage());
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}
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}
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function saml_install() {
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Hook::register('login_hook', __FILE__, 'saml_sso_initiate');
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Hook::register('logging_out', __FILE__, 'saml_slo_initiate');
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Hook::register('head', __FILE__, 'saml_head');
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Hook::register('footer', __FILE__, 'saml_footer');
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}
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function saml_head(&$a, &$b) {
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DI::page()->registerStylesheet(__DIR__ . '/saml.css');
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}
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function saml_footer(&$a, &$b) {
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$fragment = addslashes(DI::config()->get('saml', 'settings_statement'));
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$b .= <<<EOL
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<script>
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var target=$("#settings-nickname-desc");
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if (target.length) { target.append("$fragment"); }
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</script>
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EOL;
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}
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function saml_is_configured() {
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return
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DI::config()->get('saml', 'idp_id') &&
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DI::config()->get('saml', 'client_id') &&
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DI::config()->get('saml', 'sso_url') &&
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DI::config()->get('saml', 'slo_request_url') &&
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DI::config()->get('saml', 'slo_response_url') &&
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DI::config()->get('saml', 'sp_key') &&
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DI::config()->get('saml', 'sp_cert') &&
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DI::config()->get('saml', 'idp_cert');
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}
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function saml_sso_initiate(&$a, &$b) {
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if (!saml_is_configured()) return;
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$auth = new \OneLogin\Saml2\Auth(saml_settings());
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$ssoBuiltUrl = $auth->login(null, array(), false, false, true);
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$_SESSION['AuthNRequestID'] = $auth->getLastRequestID();
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header('Pragma: no-cache');
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header('Cache-Control: no-cache, must-revalidate');
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header('Location: ' . $ssoBuiltUrl);
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exit();
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}
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function saml_sso_reply($a) {
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$auth = new \OneLogin\Saml2\Auth(saml_settings());
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$requestID = null;
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if (isset($_SESSION) && isset($_SESSION['AuthNRequestID'])) {
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$requestID = $_SESSION['AuthNRequestID'];
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}
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$auth->processResponse($requestID);
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unset($_SESSION['AuthNRequestID']);
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$errors = $auth->getErrors();
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if (!empty($errors)) {
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echo "Errors encountered.";
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Logger::error(implode(', ', $errors));
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exit();
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}
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if (!$auth->isAuthenticated()) {
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echo "Not authenticated";
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exit();
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}
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$username = $auth->getNameId();
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$email = $auth->getAttributeWithFriendlyName('email')[0];
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$name = $auth->getAttributeWithFriendlyName('givenName')[0];
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$last_name = $auth->getAttributeWithFriendlyName('surname')[0];
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if (strlen($last_name)) {
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$name .= " $last_name";
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}
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if (!DBA::exists('user', ['nickname' => $username])) {
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$user = saml_create_user($username, $email, $name);
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} else {
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$user = User::getByNickname($username);
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}
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if (!empty($user['uid'])) {
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DI::auth()->setForUser($a, $user);
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}
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if (isset($_POST['RelayState'])
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&& \OneLogin\Saml2\Utils::getSelfURL() != $_POST['RelayState'])
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{
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$auth->redirectTo($_POST['RelayState']);
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}
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}
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function saml_slo_initiate(&$a, &$b) {
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$auth = new \OneLogin\Saml2\Auth(saml_settings());
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$sloBuiltUrl = $auth->logout();
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$_SESSION['LogoutRequestID'] = $auth->getLastRequestID();
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header('Pragma: no-cache');
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header('Cache-Control: no-cache, must-revalidate');
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header('Location: ' . $sloBuiltUrl);
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exit();
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}
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function saml_slo_reply() {
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$auth = new \OneLogin\Saml2\Auth(saml_settings());
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if (isset($_SESSION) && isset($_SESSION['LogoutRequestID'])) {
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$requestID = $_SESSION['LogoutRequestID'];
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} else {
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$requestID = null;
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}
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$auth->processSLO(false, $requestID);
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$errors = $auth->getErrors();
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if (empty($errors)) {
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$auth->redirectTo(DI::baseUrl());
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} else {
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Logger::error(implode(', ', $errors));
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}
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}
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function saml_input($key, $label, $description) {
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return [
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'$' . $key => [
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$key,
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DI::l10n()->t($label),
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DI::config()->get('saml', $key),
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DI::l10n()->t($description),
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true, // all the fields are required
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]
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];
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}
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function saml_addon_admin (&$a, &$o) {
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$form =
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saml_input(
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'settings_statement',
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'Settings statement',
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'A statement on the settings page explaining where the user should go to change their e-mail and password. HTML allowed.'
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) +
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saml_input(
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'idp_id',
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'IdP ID',
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'Identity provider (IdP) entity URI (e.g., https://example.com/auth/realms/user).'
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) +
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saml_input(
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'client_id',
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'Client ID',
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'Identifier assigned to client by the identity provider (IdP).'
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) +
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saml_input(
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'sso_url',
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'IdP SSO URL',
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'The URL for your identity provider\'s SSO endpoint.'
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) +
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saml_input(
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'slo_request_url',
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'IdP SLO request URL',
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'The URL for your identity provider\'s SLO request endpoint.'
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) +
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saml_input(
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'slo_response_url',
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'IdP SLO response URL',
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'The URL for your identity provider\'s SLO response endpoint.'
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) +
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saml_input(
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'sp_key',
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'SP private key',
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'The private key the addon should use to authenticate.'
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) +
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saml_input(
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'sp_cert',
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'SP certificate',
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'The certficate for the addon\'s private key.'
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) +
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saml_input(
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'idp_cert',
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'IdP certificate',
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'The x509 certficate for your identity provider.'
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) +
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[
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'$submit' => DI::l10n()->t('Save Settings'),
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];
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$t = Renderer::getMarkupTemplate( "admin.tpl", "addon/saml/" );
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$o = Renderer::replaceMacros( $t, $form);
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}
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function saml_addon_admin_post (&$a) {
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$safeset = function ($key) {
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$val = (!empty($_POST[$key]) ? Strings::escapeTags(trim($_POST[$key])) : '');
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DI::config()->set('saml', $key, $val);
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};
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$safeset('idp_id');
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$safeset('client_id');
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$safeset('sso_url');
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$safeset('slo_request_url');
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$safeset('slo_response_url');
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$safeset('sp_key');
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$safeset('sp_cert');
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$safeset('idp_cert');
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// Not using safeset here since settings_statement is *meant* to include HTML tags.
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DI::config()->set('saml', 'settings_statement', $_POST['settings_statement']);
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}
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function saml_create_user($username, $email, $name) {
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if (!strlen($email) || !strlen($name)) {
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Logger::error('Could not create user: no email or username given.');
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return false;
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}
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try {
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$strong = false;
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$bytes = openssl_random_pseudo_bytes(intval(ceil(PW_LEN * 0.75)), $strong);
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if (!$strong) {
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throw new Exception('Strong algorithm not available for PRNG.');
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}
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$user = User::create([
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'username' => $name,
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'nickname' => $username,
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'email' => $email,
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'password' => base64_encode($bytes), // should be at least PW_LEN long
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'verified' => true
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]);
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return $user;
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} catch (Exception $e) {
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Logger::error(
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'Exception while creating user',
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[
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'username' => $username,
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'email' => $email,
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'name' => $name,
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'exception' => $e->getMessage(),
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'trace' => $e->getTraceAsString()
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]);
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return false;
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}
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}
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function saml_settings() {
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return array(
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// If 'strict' is True, then the PHP Toolkit will reject unsigned
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// or unencrypted messages if it expects them to be signed or encrypted.
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// Also it will reject the messages if the SAML standard is not strictly
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// followed: Destination, NameId, Conditions ... are validated too.
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// Should never be set to anything else in production!
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'strict' => true,
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// Enable debug mode (to print errors).
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'debug' => false,
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// Set a BaseURL to be used instead of try to guess
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// the BaseURL of the view that process the SAML Message.
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// Ex http://sp.example.com/
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// http://example.com/sp/
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'baseurl' => DI::baseUrl() . "/saml",
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// Service Provider Data that we are deploying.
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'sp' => array(
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// Identifier of the SP entity (must be a URI)
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'entityId' => DI::config()->get('saml','client_id'),
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// Specifies info about where and how the <AuthnResponse> message MUST be
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// returned to the requester, in this case our SP.
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'assertionConsumerService' => array(
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// URL Location where the <Response> from the IdP will be returned
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'url' => DI::baseUrl() . "/saml/sso",
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// SAML protocol binding to be used when returning the <Response>
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// message. OneLogin Toolkit supports this endpoint for the
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// HTTP-POST binding only.
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'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST',
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),
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// If you need to specify requested attributes, set a
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// attributeConsumingService. nameFormat, attributeValue and
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// friendlyName can be omitted
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"attributeConsumingService"=> array(
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"serviceName" => "Friendica SAML SSO and SLO Addon",
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"serviceDescription" => "SLO and SSO support for Friendica",
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"requestedAttributes" => array(
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array(
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"uid" => "",
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"isRequired" => false,
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)
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)
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),
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// Specifies info about where and how the <Logout Response> message MUST be
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// returned to the requester, in this case our SP.
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'singleLogoutService' => array(
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// URL Location where the <Response> from the IdP will be returned
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'url' => DI::baseUrl() . "/saml/slo",
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// SAML protocol binding to be used when returning the <Response>
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// message. OneLogin Toolkit supports the HTTP-Redirect binding
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// only for this endpoint.
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'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
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),
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// Specifies the constraints on the name identifier to be used to
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// represent the requested subject.
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// Take a look on lib/Saml2/Constants.php to see the NameIdFormat supported.
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'NameIDFormat' => 'urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified',
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// Usually x509cert and privateKey of the SP are provided by files placed at
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// the certs folder. But we can also provide them with the following parameters
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'x509cert' => DI::config()->get('saml','sp_cert'),
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'privateKey' => DI::config()->get('saml','sp_key'),
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),
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// Identity Provider Data that we want connected with our SP.
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'idp' => array(
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// Identifier of the IdP entity (must be a URI)
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'entityId' => DI::config()->get('saml','idp_id'),
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// SSO endpoint info of the IdP. (Authentication Request protocol)
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'singleSignOnService' => array(
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// URL Target of the IdP where the Authentication Request Message
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// will be sent.
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'url' => DI::config()->get('saml','sso_url'),
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// SAML protocol binding to be used when returning the <Response>
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// message. OneLogin Toolkit supports the HTTP-Redirect binding
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// only for this endpoint.
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'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
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),
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// SLO endpoint info of the IdP.
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'singleLogoutService' => array(
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// URL Location of the IdP where SLO Request will be sent.
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'url' => DI::config()->get('saml','slo_request_url'),
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// URL location of the IdP where SLO Response will be sent (ResponseLocation)
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// if not set, url for the SLO Request will be used
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'responseUrl' => DI::config()->get('saml','slo_response_url'),
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// SAML protocol binding to be used when returning the <Response>
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// message. OneLogin Toolkit supports the HTTP-Redirect binding
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// only for this endpoint.
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'binding' => 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
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),
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// Public x509 certificate of the IdP
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'x509cert' => DI::config()->get('saml','idp_cert'),
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),
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'security' => array (
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'wantXMLValidation' => false,
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// Indicates whether the <samlp:AuthnRequest> messages sent by this SP
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// will be signed. [Metadata of the SP will offer this info]
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'authnRequestsSigned' => true,
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// Indicates whether the <samlp:logoutRequest> messages sent by this SP
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// will be signed.
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'logoutRequestSigned' => true,
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// Indicates whether the <samlp:logoutResponse> messages sent by this SP
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// will be signed.
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'logoutResponseSigned' => true,
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/* Sign the Metadata */
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'signMetadata' => true,
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)
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);
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}
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?>
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