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<?php declare(strict_types=1); |
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namespace SilverStripe\WebAuthn; |
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use CBOR\Decoder; |
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use CBOR\OtherObject\OtherObjectManager; |
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use CBOR\Tag\TagObjectManager; |
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use Cose\Algorithms; |
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use Exception; |
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use GuzzleHttp\Psr7\ServerRequest; |
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use SilverStripe\Control\Director; |
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use SilverStripe\Control\HTTPRequest; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Extensible; |
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use SilverStripe\MFA\Method\Handler\RegisterHandlerInterface; |
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use SilverStripe\MFA\State\Result; |
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use SilverStripe\MFA\Store\StoreInterface; |
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use SilverStripe\Security\Member; |
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use SilverStripe\SiteConfig\SiteConfig; |
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use Webauthn\AttestationStatement\AttestationObjectLoader; |
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use Webauthn\AttestationStatement\AttestationStatementSupportManager; |
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use Webauthn\AttestationStatement\FidoU2FAttestationStatementSupport; |
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use Webauthn\AttestationStatement\NoneAttestationStatementSupport; |
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use Webauthn\AuthenticationExtensions\AuthenticationExtensionsClientInputs; |
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use Webauthn\AuthenticationExtensions\ExtensionOutputCheckerHandler; |
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use Webauthn\AuthenticatorAttestationResponse; |
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use Webauthn\AuthenticatorAttestationResponseValidator; |
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use Webauthn\AuthenticatorSelectionCriteria; |
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use Webauthn\PublicKeyCredentialCreationOptions; |
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use Webauthn\PublicKeyCredentialLoader; |
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use Webauthn\PublicKeyCredentialParameters; |
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use Webauthn\PublicKeyCredentialRpEntity; |
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use Webauthn\PublicKeyCredentialUserEntity; |
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use Webauthn\TokenBinding\TokenBindingNotSupportedHandler; |
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class RegisterHandler implements RegisterHandlerInterface |
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{ |
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use Extensible; |
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use Configurable; |
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/** |
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* Provide a user help link that will be available when registering backup codes |
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* TODO Will this have a user help link as a default? |
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* |
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* @config |
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* @var string |
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*/ |
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private static $user_help_link; |
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/** |
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* The default attachment mode to use for Authentication Selection Criteria. |
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* |
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* See {@link getAuthenticatorSelectionCriteria()} for more information. |
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* |
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* @config |
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* @var string |
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*/ |
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private static $authenticator_attachment = AuthenticatorSelectionCriteria::AUTHENTICATOR_ATTACHMENT_CROSS_PLATFORM; |
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/** |
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* Stores any data required to handle a registration process with a method, and returns relevant state to be applied |
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* to the front-end application managing the process. |
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* |
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* @param StoreInterface $store An object that hold session data (and the Member) that can be mutated |
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* @return array Props to be passed to a front-end component |
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* @throws Exception When there is no valid source of CSPRNG |
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*/ |
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public function start(StoreInterface $store): array |
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{ |
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$options = $this->getCredentialCreationOptions($store, true); |
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return [ |
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'keyData' => $options, |
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]; |
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} |
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/** |
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* Confirm that the provided details are valid, and create a new RegisteredMethod against the member. |
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* |
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* @param HTTPRequest $request |
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* @param StoreInterface $store |
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* @return Result |
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* @throws Exception |
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*/ |
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public function register(HTTPRequest $request, StoreInterface $store): Result |
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{ |
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$options = $this->getCredentialCreationOptions($store); |
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$data = json_decode($request->getBody(), true); |
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// CBOR |
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$decoder = new Decoder(new TagObjectManager(), new OtherObjectManager()); |
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// Attestation statement support manager |
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$attestationStatementSupportManager = new AttestationStatementSupportManager(); |
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$attestationStatementSupportManager->add(new NoneAttestationStatementSupport()); |
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$attestationStatementSupportManager->add(new FidoU2FAttestationStatementSupport($decoder)); |
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// Attestation object loader |
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$attestationObjectLoader = new AttestationObjectLoader($attestationStatementSupportManager, $decoder); |
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$publicKeyCredentialLoader = new PublicKeyCredentialLoader($attestationObjectLoader, $decoder); |
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$credentialRepository = new CredentialRepository($store->getMember()); |
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$authenticatorAttestationResponseValidator = new AuthenticatorAttestationResponseValidator( |
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$attestationStatementSupportManager, |
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$credentialRepository, |
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new TokenBindingNotSupportedHandler(), |
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new ExtensionOutputCheckerHandler() |
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); |
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// Create a PSR-7 request |
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$request = ServerRequest::fromGlobals(); |
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try { |
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$publicKeyCredential = $publicKeyCredentialLoader->load(base64_decode($data['credentials'])); |
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$response = $publicKeyCredential->getResponse(); |
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if (!$response instanceof AuthenticatorAttestationResponse) { |
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die('why even have this?'); |
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} |
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$authenticatorAttestationResponseValidator->check($response, $options, $request); |
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} catch (Exception $e) { |
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return Result::create(false, 'Registration failed: ' . $e->getMessage()); |
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} |
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if (!$response->getAttestationObject()->getAuthData()->hasAttestedCredentialData()) { |
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die('something else that might go wrong but probably wont'); |
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} |
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return Result::create()->setContext([ |
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'descriptor' => $publicKeyCredential->getPublicKeyCredentialDescriptor(), |
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'data' => $response->getAttestationObject()->getAuthData()->getAttestedCredentialData(), |
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'counter' => null, |
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]); |
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} |
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/** |
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* Provide a localised name for this MFA Method. |
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* |
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* @return string |
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*/ |
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public function getName(): string |
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{ |
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return _t(__CLASS__ . '.NAME', 'Security key'); |
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} |
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/** |
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* Provide a localised description of this MFA Method. |
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* |
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* eg. "Verification codes are created by an app on your phone" |
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* |
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* @return string |
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*/ |
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public function getDescription(): string |
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{ |
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return _t( |
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__CLASS__ . '.DESCRIPTION', |
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'A small USB device which is used for verifying you' |
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); |
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} |
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/** |
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* Provide a localised URL to a support article about the registration process for this MFA Method. |
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* |
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* @return string |
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*/ |
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public function getSupportLink(): string |
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{ |
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return static::config()->get('user_help_link') ?: ''; |
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} |
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/** |
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* Get the key that a React UI component is registered under (with @silverstripe/react-injector on the front-end) |
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* |
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* @return string |
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*/ |
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public function getComponent(): string |
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{ |
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return 'WebAuthnRegister'; |
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} |
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/** |
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* @return PublicKeyCredentialRpEntity |
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*/ |
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protected function getRelyingPartyEntity(): PublicKeyCredentialRpEntity |
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{ |
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// Relying party entity ONLY allows domains or subdomains. Remove ports or anything else that isn't already. |
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// See https://github.com/web-auth/webauthn-framework/blob/v1.2.2/doc/webauthn/PublicKeyCredentialCreation.md#relying-party-entity |
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$host = parse_url(Director::host(), PHP_URL_HOST); |
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return new PublicKeyCredentialRpEntity( |
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(string) SiteConfig::current_site_config()->Title, |
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$host, |
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static::config()->get('application_logo') |
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); |
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} |
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/** |
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* @param Member $member |
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* @return PublicKeyCredentialUserEntity |
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*/ |
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protected function getUserEntity(Member $member): PublicKeyCredentialUserEntity |
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{ |
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return new PublicKeyCredentialUserEntity( |
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$member->getName(), |
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(string) $member->ID, |
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$member->getName() |
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); |
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} |
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/** |
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* @param StoreInterface $store |
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* @param bool $reset |
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* @return PublicKeyCredentialCreationOptions |
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* @throws Exception |
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*/ |
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protected function getCredentialCreationOptions( |
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StoreInterface $store, |
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bool $reset = false |
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): PublicKeyCredentialCreationOptions { |
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$state = $store->getState(); |
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if (!$reset && !empty($state) && !empty($state['credentialOptions'])) { |
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return PublicKeyCredentialCreationOptions::createFromArray($state['credentialOptions']); |
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} |
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$credentialOptions = new PublicKeyCredentialCreationOptions( |
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$this->getRelyingPartyEntity(), |
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$this->getUserEntity($store->getMember()), |
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random_bytes(32), |
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[new PublicKeyCredentialParameters('public-key', Algorithms::COSE_ALGORITHM_ES256)], |
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40000, |
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[], |
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$this->getAuthenticatorSelectionCriteria(), |
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PublicKeyCredentialCreationOptions::ATTESTATION_CONVEYANCE_PREFERENCE_NONE, |
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new AuthenticationExtensionsClientInputs() |
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); |
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$store->setState(['credentialOptions' => $credentialOptions] + $state); |
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return $credentialOptions; |
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} |
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/** |
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* Returns an "Authenticator Selection Criteria" object which is intended to select the appropriate authenticators |
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* to participate in the creation operation. |
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* |
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* The default is to allow only "cross platform" authenticators, e.g. disabling "single platform" authenticators |
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* such as touch ID. |
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* |
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* For more information: https://github.com/web-auth/webauthn-framework/blob/v1.2/doc/webauthn/PublicKeyCredentialCreation.md#authenticator-selection-criteria |
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* |
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* @return AuthenticatorSelectionCriteria |
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*/ |
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protected function getAuthenticatorSelectionCriteria(): AuthenticatorSelectionCriteria |
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{ |
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return new AuthenticatorSelectionCriteria( |
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(string) $this->config()->get('authenticator_attachment') |
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); |
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} |
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} |
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