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https://github.com/BookStackApp/BookStack.git
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![Dan Brown](/assets/img/avatar_default.png)
As per #3047. Also made some SAML specific fixes: - IDP initiated login was broken due to forced default session value. Double checked against OneLogin lib docs that this reverted logic was fine. - Changed how the saml login flow works to use 'withoutMiddleware' on the route instead of hacking out the session driver. This was due to the array driver (previously used for the hack) no longer being considered non-persistent.
397 lines
11 KiB
PHP
397 lines
11 KiB
PHP
<?php
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namespace BookStack\Auth\Access;
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use BookStack\Auth\User;
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use BookStack\Exceptions\JsonDebugException;
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use BookStack\Exceptions\SamlException;
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use BookStack\Exceptions\StoppedAuthenticationException;
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use BookStack\Exceptions\UserRegistrationException;
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use Exception;
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use OneLogin\Saml2\Auth;
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use OneLogin\Saml2\Constants;
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use OneLogin\Saml2\Error;
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use OneLogin\Saml2\IdPMetadataParser;
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use OneLogin\Saml2\ValidationError;
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/**
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* Class Saml2Service
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* Handles any app-specific SAML tasks.
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*/
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class Saml2Service
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{
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protected $config;
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protected $registrationService;
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protected $loginService;
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protected $groupSyncService;
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/**
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* Saml2Service constructor.
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*/
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public function __construct(
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RegistrationService $registrationService,
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LoginService $loginService,
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GroupSyncService $groupSyncService
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) {
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$this->config = config('saml2');
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$this->registrationService = $registrationService;
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$this->loginService = $loginService;
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$this->groupSyncService = $groupSyncService;
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}
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/**
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* Initiate a login flow.
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*
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* @throws Error
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*/
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public function login(): array
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{
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$toolKit = $this->getToolkit();
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$returnRoute = url('/saml2/acs');
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return [
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'url' => $toolKit->login($returnRoute, [], false, false, true),
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'id' => $toolKit->getLastRequestID(),
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];
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}
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/**
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* Initiate a logout flow.
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*
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* @throws Error
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*/
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public function logout(User $user): array
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{
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$toolKit = $this->getToolkit();
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$returnRoute = url('/');
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try {
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$url = $toolKit->logout(
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$returnRoute,
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[],
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$user->email,
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null,
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true,
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Constants::NAMEID_EMAIL_ADDRESS
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);
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$id = $toolKit->getLastRequestID();
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} catch (Error $error) {
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if ($error->getCode() !== Error::SAML_SINGLE_LOGOUT_NOT_SUPPORTED) {
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throw $error;
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}
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$this->actionLogout();
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$url = '/';
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$id = null;
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}
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return ['url' => $url, 'id' => $id];
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}
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/**
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* Process the ACS response from the idp and return the
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* matching, or new if registration active, user matched to the idp.
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* Returns null if not authenticated.
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*
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* @throws Error
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* @throws SamlException
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* @throws ValidationError
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* @throws JsonDebugException
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* @throws UserRegistrationException
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*/
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public function processAcsResponse(?string $requestId, string $samlResponse): ?User
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{
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// The SAML2 toolkit expects the response to be within the $_POST superglobal
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// so we need to manually put it back there at this point.
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$_POST['SAMLResponse'] = $samlResponse;
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$toolkit = $this->getToolkit();
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$toolkit->processResponse($requestId);
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$errors = $toolkit->getErrors();
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if (!empty($errors)) {
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throw new Error(
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'Invalid ACS Response: ' . implode(', ', $errors)
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);
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}
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if (!$toolkit->isAuthenticated()) {
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return null;
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}
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$attrs = $toolkit->getAttributes();
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$id = $toolkit->getNameId();
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return $this->processLoginCallback($id, $attrs);
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}
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/**
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* Process a response for the single logout service.
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*
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* @throws Error
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*/
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public function processSlsResponse(?string $requestId): ?string
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{
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$toolkit = $this->getToolkit();
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// The $retrieveParametersFromServer in the call below will mean the library will take the query
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// parameters, used for the response signing, from the raw $_SERVER['QUERY_STRING']
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// value so that the exact encoding format is matched when checking the signature.
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// This is primarily due to ADFS encoding query params with lowercase percent encoding while
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// PHP (And most other sensible providers) standardise on uppercase.
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$redirect = $toolkit->processSLO(true, $requestId, true, null, true);
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$errors = $toolkit->getErrors();
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if (!empty($errors)) {
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throw new Error(
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'Invalid SLS Response: ' . implode(', ', $errors)
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);
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}
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$this->actionLogout();
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return $redirect;
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}
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/**
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* Do the required actions to log a user out.
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*/
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protected function actionLogout()
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{
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auth()->logout();
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session()->invalidate();
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}
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/**
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* Get the metadata for this service provider.
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*
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* @throws Error
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*/
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public function metadata(): string
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{
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$toolKit = $this->getToolkit();
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$settings = $toolKit->getSettings();
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$metadata = $settings->getSPMetadata();
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$errors = $settings->validateMetadata($metadata);
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if (!empty($errors)) {
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throw new Error(
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'Invalid SP metadata: ' . implode(', ', $errors),
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Error::METADATA_SP_INVALID
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);
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}
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return $metadata;
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}
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/**
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* Load the underlying Onelogin SAML2 toolkit.
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*
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* @throws Error
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* @throws Exception
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*/
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protected function getToolkit(): Auth
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{
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$settings = $this->config['onelogin'];
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$overrides = $this->config['onelogin_overrides'] ?? [];
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if ($overrides && is_string($overrides)) {
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$overrides = json_decode($overrides, true);
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}
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$metaDataSettings = [];
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if ($this->config['autoload_from_metadata']) {
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$metaDataSettings = IdPMetadataParser::parseRemoteXML($settings['idp']['entityId']);
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}
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$spSettings = $this->loadOneloginServiceProviderDetails();
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$settings = array_replace_recursive($settings, $spSettings, $metaDataSettings, $overrides);
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return new Auth($settings);
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}
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/**
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* Load dynamic service provider options required by the onelogin toolkit.
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*/
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protected function loadOneloginServiceProviderDetails(): array
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{
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$spDetails = [
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'entityId' => url('/saml2/metadata'),
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'assertionConsumerService' => [
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'url' => url('/saml2/acs'),
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],
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'singleLogoutService' => [
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'url' => url('/saml2/sls'),
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],
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];
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return [
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'baseurl' => url('/saml2'),
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'sp' => $spDetails,
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];
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}
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/**
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* Check if groups should be synced.
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*/
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protected function shouldSyncGroups(): bool
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{
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return $this->config['user_to_groups'] !== false;
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}
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/**
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* Calculate the display name.
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*/
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protected function getUserDisplayName(array $samlAttributes, string $defaultValue): string
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{
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$displayNameAttr = $this->config['display_name_attributes'];
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$displayName = [];
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foreach ($displayNameAttr as $dnAttr) {
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$dnComponent = $this->getSamlResponseAttribute($samlAttributes, $dnAttr, null);
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if ($dnComponent !== null) {
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$displayName[] = $dnComponent;
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}
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}
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if (count($displayName) == 0) {
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$displayName = $defaultValue;
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} else {
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$displayName = implode(' ', $displayName);
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}
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return $displayName;
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}
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/**
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* Get the value to use as the external id saved in BookStack
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* used to link the user to an existing BookStack DB user.
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*/
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protected function getExternalId(array $samlAttributes, string $defaultValue)
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{
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$userNameAttr = $this->config['external_id_attribute'];
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if ($userNameAttr === null) {
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return $defaultValue;
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}
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return $this->getSamlResponseAttribute($samlAttributes, $userNameAttr, $defaultValue);
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}
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/**
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* Extract the details of a user from a SAML response.
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*
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* @return array{external_id: string, name: string, email: string, saml_id: string}
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*/
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protected function getUserDetails(string $samlID, $samlAttributes): array
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{
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$emailAttr = $this->config['email_attribute'];
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$externalId = $this->getExternalId($samlAttributes, $samlID);
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$defaultEmail = filter_var($samlID, FILTER_VALIDATE_EMAIL) ? $samlID : null;
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$email = $this->getSamlResponseAttribute($samlAttributes, $emailAttr, $defaultEmail);
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return [
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'external_id' => $externalId,
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'name' => $this->getUserDisplayName($samlAttributes, $externalId),
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'email' => $email,
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'saml_id' => $samlID,
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];
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}
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/**
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* Get the groups a user is a part of from the SAML response.
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*/
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public function getUserGroups(array $samlAttributes): array
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{
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$groupsAttr = $this->config['group_attribute'];
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$userGroups = $samlAttributes[$groupsAttr] ?? null;
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if (!is_array($userGroups)) {
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$userGroups = [];
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}
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return $userGroups;
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}
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/**
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* For an array of strings, return a default for an empty array,
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* a string for an array with one element and the full array for
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* more than one element.
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*/
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protected function simplifyValue(array $data, $defaultValue)
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{
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switch (count($data)) {
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case 0:
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$data = $defaultValue;
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break;
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case 1:
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$data = $data[0];
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break;
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}
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return $data;
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}
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/**
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* Get a property from an SAML response.
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* Handles properties potentially being an array.
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*/
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protected function getSamlResponseAttribute(array $samlAttributes, string $propertyKey, $defaultValue)
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{
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if (isset($samlAttributes[$propertyKey])) {
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return $this->simplifyValue($samlAttributes[$propertyKey], $defaultValue);
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}
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return $defaultValue;
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}
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/**
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* Process the SAML response for a user. Login the user when
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* they exist, optionally registering them automatically.
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*
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* @throws SamlException
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* @throws JsonDebugException
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* @throws UserRegistrationException
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* @throws StoppedAuthenticationException
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*/
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public function processLoginCallback(string $samlID, array $samlAttributes): User
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{
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$userDetails = $this->getUserDetails($samlID, $samlAttributes);
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$isLoggedIn = auth()->check();
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if ($this->config['dump_user_details']) {
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throw new JsonDebugException([
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'id_from_idp' => $samlID,
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'attrs_from_idp' => $samlAttributes,
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'attrs_after_parsing' => $userDetails,
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]);
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}
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if ($userDetails['email'] === null) {
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throw new SamlException(trans('errors.saml_no_email_address'));
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}
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if ($isLoggedIn) {
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throw new SamlException(trans('errors.saml_already_logged_in'), '/login');
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}
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$user = $this->registrationService->findOrRegister(
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$userDetails['name'],
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$userDetails['email'],
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$userDetails['external_id']
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);
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if ($user === null) {
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throw new SamlException(trans('errors.saml_user_not_registered', ['name' => $userDetails['external_id']]), '/login');
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}
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if ($this->shouldSyncGroups()) {
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$groups = $this->getUserGroups($samlAttributes);
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$this->groupSyncService->syncUserWithFoundGroups($user, $groups, $this->config['remove_from_groups']);
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}
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$this->loginService->login($user, 'saml2');
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return $user;
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}
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}
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