270 lines
9.0 KiB
PHP
270 lines
9.0 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2020, Roeland Jago Douma <roeland@famdouma.nl>
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*
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\Authentication\WebAuthn;
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use Cose\Algorithm\Signature\ECDSA\ES256;
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use Cose\Algorithm\Signature\RSA\RS256;
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use Cose\Algorithms;
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use GuzzleHttp\Psr7\ServerRequest;
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use OC\Authentication\WebAuthn\Db\PublicKeyCredentialEntity;
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use OC\Authentication\WebAuthn\Db\PublicKeyCredentialMapper;
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use OCP\AppFramework\Db\DoesNotExistException;
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use OCP\IConfig;
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use OCP\ILogger;
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use OCP\IUser;
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use Webauthn\AttestationStatement\AttestationObjectLoader;
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use Webauthn\AttestationStatement\AttestationStatementSupportManager;
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use Webauthn\AttestationStatement\NoneAttestationStatementSupport;
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use Webauthn\AuthenticationExtensions\ExtensionOutputCheckerHandler;
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use Webauthn\AuthenticatorAssertionResponse;
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use Webauthn\AuthenticatorAssertionResponseValidator;
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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\PublicKeyCredentialDescriptor;
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use Webauthn\PublicKeyCredentialLoader;
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use Webauthn\PublicKeyCredentialParameters;
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use Webauthn\PublicKeyCredentialRequestOptions;
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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 Manager {
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/** @var CredentialRepository */
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private $repository;
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/** @var PublicKeyCredentialMapper */
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private $credentialMapper;
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/** @var ILogger */
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private $logger;
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/** @var IConfig */
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private $config;
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public function __construct(
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CredentialRepository $repository,
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PublicKeyCredentialMapper $credentialMapper,
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ILogger $logger,
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IConfig $config
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) {
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$this->repository = $repository;
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$this->credentialMapper = $credentialMapper;
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$this->logger = $logger;
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$this->config = $config;
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}
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public function startRegistration(IUser $user, string $serverHost): PublicKeyCredentialCreationOptions {
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$rpEntity = new PublicKeyCredentialRpEntity(
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'Nextcloud', //Name
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$this->stripPort($serverHost), //ID
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null //Icon
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);
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$userEntity = new PublicKeyCredentialUserEntity(
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$user->getUID(), //Name
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$user->getUID(), //ID
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$user->getDisplayName() //Display name
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// 'https://foo.example.co/avatar/123e4567-e89b-12d3-a456-426655440000' //Icon
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);
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$challenge = random_bytes(32);
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$publicKeyCredentialParametersList = [
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new PublicKeyCredentialParameters('public-key', Algorithms::COSE_ALGORITHM_ES256),
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new PublicKeyCredentialParameters('public-key', Algorithms::COSE_ALGORITHM_RS256),
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];
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$timeout = 60000;
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$excludedPublicKeyDescriptors = [
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];
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$authenticatorSelectionCriteria = new AuthenticatorSelectionCriteria();
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return new PublicKeyCredentialCreationOptions(
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$rpEntity,
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$userEntity,
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$challenge,
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$publicKeyCredentialParametersList,
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$timeout,
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$excludedPublicKeyDescriptors,
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$authenticatorSelectionCriteria,
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PublicKeyCredentialCreationOptions::ATTESTATION_CONVEYANCE_PREFERENCE_NONE,
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null
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);
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}
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public function finishRegister(PublicKeyCredentialCreationOptions $publicKeyCredentialCreationOptions, string $name, string $data): PublicKeyCredentialEntity {
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$tokenBindingHandler = new TokenBindingNotSupportedHandler();
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$attestationStatementSupportManager = new AttestationStatementSupportManager();
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$attestationStatementSupportManager->add(new NoneAttestationStatementSupport());
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$attestationObjectLoader = new AttestationObjectLoader($attestationStatementSupportManager);
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$publicKeyCredentialLoader = new PublicKeyCredentialLoader($attestationObjectLoader);
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// Extension Output Checker Handler
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$extensionOutputCheckerHandler = new ExtensionOutputCheckerHandler();
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// Authenticator Attestation Response Validator
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$authenticatorAttestationResponseValidator = new AuthenticatorAttestationResponseValidator(
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$attestationStatementSupportManager,
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$this->repository,
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$tokenBindingHandler,
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$extensionOutputCheckerHandler
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);
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try {
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// Load the data
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$publicKeyCredential = $publicKeyCredentialLoader->load($data);
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$response = $publicKeyCredential->getResponse();
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// Check if the response is an Authenticator Attestation Response
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if (!$response instanceof AuthenticatorAttestationResponse) {
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throw new \RuntimeException('Not an authenticator attestation response');
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}
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// Check the response against the request
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$request = ServerRequest::fromGlobals();
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$publicKeyCredentialSource = $authenticatorAttestationResponseValidator->check(
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$response,
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$publicKeyCredentialCreationOptions,
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$request);
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} catch (\Throwable $exception) {
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throw $exception;
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}
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// Persist the data
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return $this->repository->saveAndReturnCredentialSource($publicKeyCredentialSource, $name);
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}
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private function stripPort(string $serverHost): string {
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return preg_replace('/(:\d+$)/', '', $serverHost);
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}
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public function startAuthentication(string $uid, string $serverHost): PublicKeyCredentialRequestOptions {
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// List of registered PublicKeyCredentialDescriptor classes associated to the user
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$registeredPublicKeyCredentialDescriptors = array_map(function (PublicKeyCredentialEntity $entity) {
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$credential = $entity->toPublicKeyCredentialSource();
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return new PublicKeyCredentialDescriptor(
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$credential->getType(),
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$credential->getPublicKeyCredentialId()
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);
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}, $this->credentialMapper->findAllForUid($uid));
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// Public Key Credential Request Options
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return new PublicKeyCredentialRequestOptions(
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random_bytes(32), // Challenge
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60000, // Timeout
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$this->stripPort($serverHost), // Relying Party ID
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$registeredPublicKeyCredentialDescriptors // Registered PublicKeyCredentialDescriptor classes
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);
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}
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public function finishAuthentication(PublicKeyCredentialRequestOptions $publicKeyCredentialRequestOptions, string $data, string $uid) {
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$attestationStatementSupportManager = new AttestationStatementSupportManager();
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$attestationStatementSupportManager->add(new NoneAttestationStatementSupport());
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$attestationObjectLoader = new AttestationObjectLoader($attestationStatementSupportManager);
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$publicKeyCredentialLoader = new PublicKeyCredentialLoader($attestationObjectLoader);
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$tokenBindingHandler = new TokenBindingNotSupportedHandler();
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$extensionOutputCheckerHandler = new ExtensionOutputCheckerHandler();
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$algorithmManager = new \Cose\Algorithm\Manager();
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$algorithmManager->add(new ES256());
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$algorithmManager->add(new RS256());
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$authenticatorAssertionResponseValidator = new AuthenticatorAssertionResponseValidator(
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$this->repository,
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$tokenBindingHandler,
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$extensionOutputCheckerHandler,
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$algorithmManager
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);
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try {
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$this->logger->debug('Loading publickey credentials from: ' . $data);
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// Load the data
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$publicKeyCredential = $publicKeyCredentialLoader->load($data);
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$response = $publicKeyCredential->getResponse();
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// Check if the response is an Authenticator Attestation Response
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if (!$response instanceof AuthenticatorAssertionResponse) {
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throw new \RuntimeException('Not an authenticator attestation response');
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}
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// Check the response against the request
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$request = ServerRequest::fromGlobals();
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$publicKeyCredentialSource = $authenticatorAssertionResponseValidator->check(
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$publicKeyCredential->getRawId(),
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$response,
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$publicKeyCredentialRequestOptions,
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$request,
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$uid
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);
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} catch (\Throwable $e) {
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throw $e;
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}
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return true;
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}
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public function deleteRegistration(IUser $user, int $id): void {
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try {
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$entry = $this->credentialMapper->findById($user->getUID(), $id);
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} catch (DoesNotExistException $e) {
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$this->logger->warning("WebAuthn device $id does not exist, can't delete it");
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return;
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}
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$this->credentialMapper->delete($entry);
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}
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public function isWebAuthnAvailable(): bool {
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if (!extension_loaded('bcmath')) {
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return false;
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}
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if (!extension_loaded('gmp')) {
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return false;
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}
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if (!$this->config->getSystemValueBool('auth.webauthn.enabled', true)) {
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return false;
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}
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return true;
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}
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}
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