579 lines
19 KiB
PHP
579 lines
19 KiB
PHP
<?php
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namespace LAM\LOGIN\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\Algorithm\Manager;
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use Cose\Algorithm\Signature\ECDSA\ES256;
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use Cose\Algorithm\Signature\ECDSA\ES384;
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use Cose\Algorithm\Signature\ECDSA\ES512;
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use Cose\Algorithm\Signature\EdDSA\EdDSA;
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use Cose\Algorithm\Signature\RSA\RS1;
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use Cose\Algorithm\Signature\RSA\RS256;
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use Cose\Algorithm\Signature\RSA\RS384;
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use Cose\Algorithm\Signature\RSA\RS512;
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use \Cose\Algorithms;
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use Nyholm\Psr7\Factory\Psr17Factory;
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use PDO;
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use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;
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use Symfony\Component\HttpFoundation\Request;
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use Throwable;
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use Webauthn\AttestationStatement\AndroidKeyAttestationStatementSupport;
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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\AttestationStatement\PackedAttestationStatementSupport;
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use Webauthn\AttestationStatement\TPMAttestationStatementSupport;
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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\PublicKeyCredentialCreationOptions;
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use Webauthn\PublicKeyCredentialDescriptor;
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use Webauthn\PublicKeyCredentialLoader;
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use Webauthn\PublicKeyCredentialRequestOptions;
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use \Webauthn\PublicKeyCredentialRpEntity;
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use \Webauthn\PublicKeyCredentialParameters;
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use Webauthn\PublicKeyCredentialSource;
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use Webauthn\PublicKeyCredentialSourceRepository;
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use \Webauthn\PublicKeyCredentialUserEntity;
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use \Webauthn\AuthenticationExtensions\AuthenticationExtensionsClientInputs;
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use \Webauthn\AuthenticatorSelectionCriteria;
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use Webauthn\TokenBinding\IgnoreTokenBindingHandler;
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use \LAMException;
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/*
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This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
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Copyright (C) 2019 Roland Gruber
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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 General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* Manages webauthn requests.
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*
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* @author Roland Gruber
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*/
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include_once __DIR__ . '/3rdParty/composer/autoload.php';
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/**
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* Manages Webauthn registrations and authentications.
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*
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* @package LAM\LOGIN\WEBAUTHN
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*/
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class WebauthnManager {
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/**
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* Returns if the given DN is registered for webauthn.
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*
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* @param string $dn DN
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* @return boolean is registered
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*/
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public function isRegistered($dn) {
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$database = $this->getDatabase();
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$userEntity = $this->getUserEntity($dn);
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$results = $database->findAllForUserEntity($userEntity);
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return !empty($results);
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}
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/**
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* Returns a challenge for a new token.
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*
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* @param string $dn DN
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* @param bool $isSelfService is executed in self service
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* @return PublicKeyCredentialCreationOptions registration object
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*/
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public function getRegistrationObject($dn, $isSelfService) {
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$rpEntity = $this->createRpEntry($isSelfService);
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$userEntity = $this->getUserEntity($dn);
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$challenge = $this->createChallenge();
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$credentialParameters = $this->getCredentialParameters();
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$excludedKeys = $this->getExcludedKeys($userEntity);
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$timeout = $this->getTimeout();
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$registrationObject = new PublicKeyCredentialCreationOptions(
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$rpEntity,
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$userEntity,
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$challenge,
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$credentialParameters,
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$timeout,
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$excludedKeys,
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new AuthenticatorSelectionCriteria(),
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PublicKeyCredentialCreationOptions::ATTESTATION_CONVEYANCE_PREFERENCE_NONE,
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new AuthenticationExtensionsClientInputs());
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logNewMessage(LOG_DEBUG, 'Webauthn registration: ' . json_encode($registrationObject));
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return $registrationObject;
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}
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/**
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* Verifies the registration and stores it in the database.
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*
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* @param PublicKeyCredentialCreationOptions $registration registration object
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* @param string $clientResponse client response
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* @return bool true if response is valid and registration succeeded
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*/
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public function storeNewRegistration($registration, $clientResponse) {
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$decoder = $this->getCborDecoder();
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$tokenBindingHandler = new IgnoreTokenBindingHandler();
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$attestationSupportManager = $this->getAttestationSupportManager($decoder);
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$attestationObjectLoader = $this->getAttestationObjectLoader($attestationSupportManager, $decoder);
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$publicKeyCredentialLoader = $this->getPublicKeyCredentialLoader($attestationObjectLoader, $decoder);
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$extensionOutputCheckerHandler = $this->getExtensionOutputChecker();
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$repository = new PublicKeyCredentialSourceRepositorySQLite();
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$responseValidator = new AuthenticatorAttestationResponseValidator(
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$attestationSupportManager, $repository, $tokenBindingHandler, $extensionOutputCheckerHandler);
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try {
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$publicKeyCredential = $publicKeyCredentialLoader->load($clientResponse);
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$authenticatorAttestationResponse = $publicKeyCredential->getResponse();
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if (!$authenticatorAttestationResponse instanceof AuthenticatorAttestationResponse) {
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logNewMessage(LOG_ERR, 'Invalid webauthn response: ' . $clientResponse);
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return false;
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}
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$symfonyRequest = Request::createFromGlobals();
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$psr17Factory = new Psr17Factory();
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$psrFactory = new PsrHttpFactory($psr17Factory, $psr17Factory, $psr17Factory, $psr17Factory);
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$psr7Request = $psrFactory->createRequest($symfonyRequest);
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$publicKeyCredentialSource = $responseValidator->check($authenticatorAttestationResponse, $registration, $psr7Request);
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$repository->saveCredentialSource($publicKeyCredentialSource);
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return true;
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}
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catch (\Throwable $exception) {
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logNewMessage(LOG_ERR, 'Webauthn validation failed: ' . $exception->getMessage() . $exception->getTraceAsString());
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}
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return false;
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}
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/**
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* Returns the user entity for the registration.
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*
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* @param $dn DN
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* @return PublicKeyCredentialUserEntity user entity
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*/
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private function getUserEntity($dn) {
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return new PublicKeyCredentialUserEntity(
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$dn,
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$dn,
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extractRDNValue($dn),
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null
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);
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}
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/**
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* Returns the part that identifies the server and application.
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*
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* @param bool $isSelfService is executed in self service
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* @return PublicKeyCredentialRpEntity relying party entry
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*/
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private function createRpEntry($isSelfService) {
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$pathPrefix = $isSelfService ? '../' : '';
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$icon = $pathPrefix . '../graphics/logo136.png';
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if (!$isSelfService) {
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$domain = $_SESSION['config']->getTwoFactorAuthenticationDomain();
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}
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return new PublicKeyCredentialRpEntity(
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'LDAP Account Manager', //Name
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$domain,
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$icon
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);
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}
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/**
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* Returns the supported credential algorithms.
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*
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* @return array algorithms
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*/
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private function getCredentialParameters() {
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return array(
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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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}
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/**
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* Returns a list of all credential ids that are already registered.
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*
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* @param PublicKeyCredentialUserEntity $user user data
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* @return PublicKeyCredentialDescriptor[] credential ids
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*/
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private function getExcludedKeys($user) {
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$keys = array();
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$repository = $this->getDatabase();
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$credentialSources = $repository->findAllForUserEntity($user);
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foreach ($credentialSources as $credentialSource) {
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$keys[] = new PublicKeyCredentialDescriptor(PublicKeyCredentialDescriptor::CREDENTIAL_TYPE_PUBLIC_KEY, $credentialSource->getPublicKeyCredentialId());
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}
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return $keys;
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}
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/**
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* Returns a CBOR decoder.
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*
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* @return Decoder decoder
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*/
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private function getCborDecoder() {
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return new Decoder(new TagObjectManager(), new OtherObjectManager());
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}
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/**
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* Creates the attestation support manager.
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*
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* @param Decoder $decoder decoder
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* @return AttestationStatementSupportManager manager
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*/
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private function getAttestationSupportManager($decoder) {
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$manager = new AttestationStatementSupportManager();
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$manager->add(new NoneAttestationStatementSupport());
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$manager->add(new FidoU2FAttestationStatementSupport());
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$manager->add(new AndroidKeyAttestationStatementSupport($decoder));
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$manager->add(new TPMAttestationStatementSupport());
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$coseManager = $this->getAlgorithmManager();
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$manager->add(new PackedAttestationStatementSupport($decoder, $coseManager));
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return $manager;
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}
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/**
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* Returns the COSE algorithm manager.
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*
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* @return Manager algorithm manager
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*/
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private function getAlgorithmManager() {
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$coseManager = new Manager();
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$coseManager->add(new ES256());
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$coseManager->add(new ES384());
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$coseManager->add(new ES512());
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$coseManager->add(new EdDSA());
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$coseManager->add(new RS1());
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$coseManager->add(new RS256());
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$coseManager->add(new RS384);
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$coseManager->add(new RS512());
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return $coseManager;
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}
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/**
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* Returns the attestation object loader.
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*
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* @param AttestationStatementSupportManager $manager support manager
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* @param Decoder $decoder decoder
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* @return AttestationObjectLoader attestation object loader
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*/
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private function getAttestationObjectLoader($manager, $decoder) {
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return new AttestationObjectLoader($manager, $decoder);
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}
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/**
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* Creates the public key credential loader.
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*
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* @param AttestationObjectLoader $attestationObjectLoader attestation object loader
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* @param Decoder $decoder decoder
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* @return PublicKeyCredentialLoader public key credential loader
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*/
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private function getPublicKeyCredentialLoader($attestationObjectLoader, $decoder) {
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return new PublicKeyCredentialLoader($attestationObjectLoader, $decoder);
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}
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/**
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* Returns the extension output checker handler.
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* No extensions are checked at this time.
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*
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* @return ExtensionOutputCheckerHandler handler
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*/
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private function getExtensionOutputChecker() {
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return new ExtensionOutputCheckerHandler();
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}
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/**
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* Returns the webauthn database.
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*
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* @return PublicKeyCredentialSourceRepositorySQLite database
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*/
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public function getDatabase() {
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return new PublicKeyCredentialSourceRepositorySQLite();
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}
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/**
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* Returns the timeout for user operations.
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*
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* @return int timeout in ms
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*/
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private function getTimeout() {
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return 120000;
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}
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/**
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* Creates a new challenge.
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*
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* @return String challenge
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*/
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private function createChallenge() {
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return generateRandomPassword(32);
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}
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/**
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* Returns the authentication object for a registered user.
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*
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* @param $userDN user DN
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* @param bool $isSelfService self service
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* @return PublicKeyCredentialRequestOptions authentication object
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*/
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public function getAuthenticationObject($userDN, bool $isSelfService) {
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$timeout = $this->getTimeout();
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$challenge = $this->createChallenge();
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$database = $this->getDatabase();
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$userEntity = $this->getUserEntity($userDN);
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$publicKeyCredentialSources = $database->findAllForUserEntity($userEntity);
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$publicKeyDescriptors = array();
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foreach ($publicKeyCredentialSources as $publicKeyCredentialSource) {
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$publicKeyDescriptors[] = $publicKeyCredentialSource->getPublicKeyCredentialDescriptor();
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}
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$userVerification = PublicKeyCredentialRequestOptions::USER_VERIFICATION_REQUIREMENT_DISCOURAGED;
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$extensions = new AuthenticationExtensionsClientInputs();
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$relyingParty = $this->createRpEntry($isSelfService);
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return new PublicKeyCredentialRequestOptions(
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$challenge,
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$timeout,
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$relyingParty->getId(),
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$publicKeyDescriptors,
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$userVerification,
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$extensions
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);
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}
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/**
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* Checks if the provided authentication is valid.
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*
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* @param string $response authentication response
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* @param string $userDn user DN
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* @return bool true if all is ok
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*/
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public function isValidAuthentication(string $response, string $userDn) {
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$database = $this->getDatabase();
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$decoder = $this->getCborDecoder();
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$tokenBindingHandler = new IgnoreTokenBindingHandler();
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$extensionOutputCheckerHandler = $this->getExtensionOutputChecker();
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$algorithmManager = $this->getAlgorithmManager();
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$responseValidator = new AuthenticatorAssertionResponseValidator(
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$database,
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$decoder,
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$tokenBindingHandler,
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$extensionOutputCheckerHandler,
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$algorithmManager
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);
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$attestationSupportManager = $this->getAttestationSupportManager($decoder);
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$attestationObjectLoader = $this->getAttestationObjectLoader($attestationSupportManager, $decoder);
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$publicKeyCredentialLoader = $this->getPublicKeyCredentialLoader($attestationObjectLoader, $decoder);
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$publicKeyCredential = $publicKeyCredentialLoader->load($response);
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$authenticatorAssertionResponse = $publicKeyCredential->getResponse();
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if (!$authenticatorAssertionResponse instanceof AuthenticatorAssertionResponse) {
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logNewMessage(LOG_ERR, 'Invalid authenticator assertion response');
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return false;
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}
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try {
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$symfonyRequest = Request::createFromGlobals();
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$psr17Factory = new Psr17Factory();
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$psrFactory = new PsrHttpFactory($psr17Factory, $psr17Factory, $psr17Factory, $psr17Factory);
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$psr7Request = $psrFactory->createRequest($symfonyRequest);
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$publicKeyCredentialRequestOptions = PublicKeyCredentialRequestOptions::createFromString($_SESSION['webauthn_authentication']);
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$responseValidator->check(
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$publicKeyCredential->getRawId(),
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$publicKeyCredential->getResponse(),
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$publicKeyCredentialRequestOptions,
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$psr7Request,
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$userDn
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);
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return true;
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}
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catch (Throwable $e) {
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logNewMessage(LOG_ERR, 'Error validating webauthn authentication: ' . $e->getMessage());
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}
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return false;
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}
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}
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/**
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* Stores the public key credentials in the SQLite database.
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*
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* @package LAM\LOGIN\WEBAUTHN
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*/
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class PublicKeyCredentialSourceRepositorySQLite implements PublicKeyCredentialSourceRepository {
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const TABLE_NAME = 'lam_webauthn';
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/**
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* Finds the public key for the given credential id.
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*
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* @param string $publicKeyCredentialId credential id
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* @return PublicKeyCredentialSource|null credential source
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*/
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public function findOneByCredentialId(string $publicKeyCredentialId): ?PublicKeyCredentialSource {
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try {
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$pdo = $this->getPDO();
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$statement = $pdo->prepare('select * from ' . self::TABLE_NAME . ' where credentialId = :credentialid');
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$statement->execute(array(':credentialid' => base64_encode($publicKeyCredentialId)));
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$results = $statement->fetchAll();
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if (!empty($results)) {
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$jsonArray = json_decode($results[0]['credentialSource'], true);
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return PublicKeyCredentialSource::createFromArray($jsonArray);
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}
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}
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catch (\PDOException $e) {
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logNewMessage(LOG_ERR, 'Webauthn database error: ' . $e->getMessage());
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}
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return null;
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}
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/**
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* Finds all credential entries for the given user.
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*
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* @param PublicKeyCredentialUserEntity $publicKeyCredentialUserEntity credential user entity
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* @return PublicKeyCredentialSource[] credential sources
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*/
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public function findAllForUserEntity(PublicKeyCredentialUserEntity $publicKeyCredentialUserEntity): array {
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$credentials = array();
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try {
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$pdo = $this->getPDO();
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$statement = $pdo->prepare('select * from ' . self::TABLE_NAME . ' where userId = :userid');
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$statement->execute(array(':userid' => $publicKeyCredentialUserEntity->getId()));
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$results = $statement->fetchAll();
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foreach ($results as $result) {
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$jsonArray = json_decode($results[0]['credentialSource'], true);
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$credentials[] = PublicKeyCredentialSource::createFromArray($jsonArray);
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}
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}
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catch (\PDOException $e) {
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logNewMessage(LOG_ERR, 'Webauthn database error: ' . $e->getMessage());
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}
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return $credentials;
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}
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/**
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* Saves the given credential in the database.
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*
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* @param PublicKeyCredentialSource $publicKeyCredentialSource credential
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*/
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public function saveCredentialSource(PublicKeyCredentialSource $publicKeyCredentialSource): void {
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$json = json_encode($publicKeyCredentialSource);
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$credentialId = base64_encode($publicKeyCredentialSource->getPublicKeyCredentialId());
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$userId = $publicKeyCredentialSource->getUserHandle();
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$currentTime = time();
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$pdo = $this->getPDO();
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$statement = $pdo->prepare('select * from ' . self::TABLE_NAME . ' where userId = :userId and credentialId = :credentialId');
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$statement->execute(array(
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':userId' => $userId,
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':credentialId' => $credentialId
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));
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$results = $statement->fetchAll();
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if (empty($results)) {
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$statement = $pdo->prepare('insert into ' . self::TABLE_NAME . ' (userId, credentialId, credentialSource, registrationTime, lastUseTime) VALUES (?, ?, ?, ?, ?)');
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$statement->execute(array(
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$userId,
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$credentialId,
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$json,
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$currentTime,
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$currentTime
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));
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logNewMessage(LOG_DEBUG, 'Stored new credential for ' . $userId);
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}
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else {
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$statement = $pdo->prepare(
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'update ' . self::TABLE_NAME .
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' set credentialSource = :credentialSource, lastUseTime = :lastUseTime' .
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' WHERE userId = :userId AND credentialId = :credentialId'
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);
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$statement->execute(array(
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|
':credentialSource' => $json,
|
|
':lastUseTime' => $currentTime,
|
|
':userId' => $userId,
|
|
':credentialId' => $credentialId
|
|
));
|
|
logNewMessage(LOG_DEBUG, 'Stored updated credential for ' . $userId);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the database URL.
|
|
*
|
|
* @return string the PDO URL
|
|
*/
|
|
public function getPdoUrl() {
|
|
$fileName = dirname(__FILE__) . '/../config/__lam.webauthn.sqlite';
|
|
if (!file_exists($fileName)) {
|
|
$handle = fopen($fileName, 'w');
|
|
fclose($handle);
|
|
chmod($fileName, 0600);
|
|
}
|
|
return 'sqlite:' . $fileName;
|
|
}
|
|
|
|
/**
|
|
* Returns the PDO.
|
|
*
|
|
* @return PDO PDO
|
|
*/
|
|
protected function getPDO() {
|
|
$pdo = new PDO($this->getPdoUrl(), null, null, array(
|
|
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
|
|
));
|
|
// initial schema
|
|
if (!$this->tableExists($pdo, self::TABLE_NAME)) {
|
|
$this->createInitialSchema($pdo);
|
|
}
|
|
return $pdo;
|
|
}
|
|
|
|
/**
|
|
* Checks if the given table name exists.
|
|
*
|
|
* @param PDO $pdo PDO object
|
|
* @param String $tableName table name to check
|
|
* @return boolean table exists
|
|
*/
|
|
protected function tableExists(&$pdo, $tableName) {
|
|
try {
|
|
$result = $pdo->query("SELECT 1 FROM $tableName LIMIT 1");
|
|
return ($result === false) ? false : true;
|
|
} catch (\PDOException $e) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Creates the initial schema.
|
|
*
|
|
* @param PDO $pdo PDO object
|
|
*/
|
|
protected function createInitialSchema($pdo) {
|
|
logNewMessage(LOG_DEBUG, 'Creating database table ' . self::TABLE_NAME);
|
|
$sql = 'create table ' . self::TABLE_NAME . '('
|
|
. 'userId TEXT NOT NULL,'
|
|
. 'credentialId TEXT NOT NULL,'
|
|
. 'credentialSource TEXT NOT NULL,'
|
|
. 'registrationTime VARCHAR(11) NOT NULL,'
|
|
. 'lastUseTime VARCHAR(11) NOT NULL,'
|
|
. 'PRIMARY KEY(userId,credentialId)'
|
|
. ');';
|
|
$pdo->exec($sql);
|
|
}
|
|
|
|
}
|
|
|
|
|