class.ilAuthProviderOpenIdConnect.php

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<?php

declare(strict_types=1);

use Jumbojett\OpenIDConnectClient;

class ilAuthProviderOpenIdConnect extends ilAuthProvider
{
    private const OIDC_AUTH_IDTOKEN = 'oidc_auth_idtoken';

    private readonly ilOpenIdConnectSettings $settings;
    private readonly ilLogger $logger;
    private readonly ilLanguage $lng;

    public function __construct(ilAuthCredentials $credentials)
    {
        global $DIC;
        parent::__construct($credentials);

        $this->logger = $DIC->logger()->auth();
        $this->settings = ilOpenIdConnectSettings::getInstance();
        $this->lng = $DIC->language();
        $this->lng->loadLanguageModule('auth');
    }

    public function handleLogout(): void
    {
        if ($this->settings->getLogoutScope() === ilOpenIdConnectSettings::LOGOUT_SCOPE_LOCAL) {
            return;
        }

        $id_token = ilSession::get(self::OIDC_AUTH_IDTOKEN);
        $this->logger->debug('Logging out with token: ' . $id_token);

        if (isset($id_token) && $id_token !== '') {
            ilSession::set(self::OIDC_AUTH_IDTOKEN, '');
            $oidc = $this->initClient();
            try {
                $oidc->signOut(
                    $id_token,
                    ILIAS_HTTP_PATH . '/' . ilStartUpGUI::logoutUrl()
                );
            } catch (\Jumbojett\OpenIDConnectClientException $e) {
                $this->logger->warning('Logging out of OIDC provider failed with: ' . $e->getMessage());
            }
        }
    }

    public function doAuthentication(ilAuthStatus $status): bool
    {
        try {
            $oidc = $this->initClient();
            $oidc->setRedirectURL(ILIAS_HTTP_PATH . '/openidconnect.php');

            $proxy = ilProxySettings::_getInstance();
            if ($proxy->isActive()) {
                $host = $proxy->getHost();
                $port = $proxy->getPort();
                if ($port) {
                    $host .= ':' . $port;
                }
                $oidc->setHttpProxy($host);
            }

            $this->logger->debug(
                'Redirect url is: ' .
                $oidc->getRedirectURL()
            );

            $oidc->addScope($this->settings->getAllScopes());
            if ($this->settings->getLoginPromptType() === ilOpenIdConnectSettings::LOGIN_ENFORCE) {
                $oidc->addAuthParam(['prompt' => 'login']);
            }

            $oidc->authenticate();
            // user is authenticated, otherwise redirected to authorization endpoint or exception

            $claims = $oidc->getVerifiedClaims();
            $this->logger->dump($claims, ilLogLevel::DEBUG);
            $status = $this->handleUpdate($status, $claims);

            // @todo : provide a general solution for all authentication methods
            //$_GET['target'] = $this->getCredentials()->getRedirectionTarget();// TODO PHP8-REVIEW Please eliminate this. Mutating the request is not allowed and will not work in ILIAS 8.

            if ($this->settings->getLogoutScope() === ilOpenIdConnectSettings::LOGOUT_SCOPE_GLOBAL) {
                ilSession::set(self::OIDC_AUTH_IDTOKEN, $oidc->getIdToken());
            }
            return true;
        } catch (Exception $e) {
            $this->logger->warning($e->getMessage());
            $this->logger->warning((string) $e->getCode());
            $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATION_FAILED);
            $status->setTranslatedReason($this->lng->txt('auth_oidc_failed'));
            return false;
        }
    }

    private function handleUpdate(ilAuthStatus $status, $user_info): ilAuthStatus
    {
        if (!is_object($user_info)) {
            $this->logger->error('Received invalid user credentials: ');
            $this->logger->dump($user_info, ilLogLevel::ERROR);
            $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATION_FAILED);
            $status->setReason('err_wrong_login');
            return $status;
        }

        $uid_field = $this->settings->getUidField();
        $ext_account = $user_info->{$uid_field} ?? '';

        if (!is_string($ext_account) || $ext_account === '') {
            $this->logger->error('Could not determine valid external account, value is empty or not a string.');
            $this->logger->dump($user_info, ilLogLevel::ERROR);
            $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATION_FAILED);
            $status->setReason('err_wrong_login');
            return $status;
        }

        $this->logger->debug('Authenticated external account: ' . $ext_account);

        $int_account = ilObjUser::_checkExternalAuthAccount(
            ilOpenIdConnectUserSync::AUTH_MODE,
            $ext_account
        );

        try {
            $sync = new ilOpenIdConnectUserSync($this->settings, $user_info);
            $sync->setExternalAccount($ext_account);
            $sync->setInternalAccount((string) $int_account);
            $sync->updateUser();

            $user_id = $sync->getUserId();
            ilSession::set('used_external_auth_mode', ilAuthUtils::AUTH_OPENID_CONNECT);
            $status->setAuthenticatedUserId($user_id);
            $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATED);
            //$_GET['target'] = $this->getCredentials()->getRedirectionTarget();// TODO PHP8-REVIEW Please eliminate this. Mutating the request is not allowed and will not work in ILIAS 8.
        } catch (ilOpenIdConnectSyncForbiddenException) {
            $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATION_FAILED);
            $status->setReason('err_wrong_login');
        }

        return $status;
    }

    private function initClient(): OpenIDConnectClient
    {
        $oidc = new OpenIDConnectClient(
            $this->settings->getProvider(),
            $this->settings->getClientId(),
            $this->settings->getSecret()
        );

        $oidc->setCodeChallengeMethod('S256');

        return $oidc;
    }
}