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<?php |
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/** |
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* Platine Webauth |
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* |
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* Platine Webauthn is the implementation of webauthn specifications |
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* |
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* This content is released under the MIT License (MIT) |
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* |
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* Copyright (c) 2020 Platine Webauth |
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* Copyright (c) Jakob Bennemann <[email protected]> |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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declare(strict_types=1); |
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namespace Platine\Webauthn\Attestation\Format; |
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use Platine\Webauthn\Attestation\AuthenticatorData; |
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use Platine\Webauthn\Exception\WebauthnException; |
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use Platine\Webauthn\Helper\ByteBuffer; |
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/** |
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* @class FidoU2F |
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* @package Platine\Webauthn\Attestation\Format |
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*/ |
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class FidoU2F extends BaseFormat |
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{ |
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/** |
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* The algorithm used |
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* @var int |
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*/ |
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protected int $algo = -7; |
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/** |
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* The signature |
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* @var string |
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*/ |
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protected string $signature; |
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/** |
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* The X5C information |
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* @var string |
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*/ |
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protected string $x5c; |
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/** |
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* Create new instance |
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* @param array<string|int, mixed> $attestationData |
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* @param AuthenticatorData $authenticatorData |
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*/ |
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public function __construct( |
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array $attestationData, |
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AuthenticatorData $authenticatorData |
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) { |
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parent::__construct($attestationData, $authenticatorData); |
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// check u2f data |
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$attestationStatement = $this->attestationData['attStmt']; |
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if ( |
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array_key_exists('alg', $attestationStatement) && |
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$attestationStatement['alg'] !== $this->algo |
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) { |
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throw new WebauthnException(sprintf( |
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'U2F only accepts algorithm -7 ("ES256"), got [%d]', |
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$attestationStatement['alg'] |
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)); |
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} |
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if ( |
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! array_key_exists('sig', $attestationStatement) || |
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! $attestationStatement['sig'] instanceof ByteBuffer |
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) { |
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throw new WebauthnException('No signature found'); |
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} |
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if ( |
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! array_key_exists('x5c', $attestationStatement) || |
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! is_array($attestationStatement['x5c']) || |
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count($attestationStatement['x5c']) !== 1 |
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) { |
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throw new WebauthnException('Invalid X5C certificate'); |
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} |
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if (! $attestationStatement['x5c'][0] instanceof ByteBuffer) { |
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throw new WebauthnException('Invalid X5C certificate must be Byte Buffer)'); |
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} |
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$this->signature = $attestationStatement['sig']->getBinaryString(); |
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$this->x5c = $attestationStatement['x5c'][0]->getBinaryString(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCertificatePem(): string |
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{ |
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$pem = '-----BEGIN CERTIFICATE-----' . "\n"; |
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$pem .= chunk_split(base64_encode($this->x5c), 64, "\n"); |
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$pem .= '-----END CERTIFICATE-----' . "\n"; |
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return $pem; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function validateAttestation(string $clientData): bool |
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{ |
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$publicKey = openssl_pkey_get_public($this->getCertificatePem()); |
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if ($publicKey === false) { |
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throw new WebauthnException(sprintf( |
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'Invalid public key used, error: [%s]', |
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openssl_error_string() |
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)); |
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} |
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// Let verificationData be the concatenation of |
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// (0x00 || rpIdHash || clientDataHash || credentialId || publicKeyU2F) |
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$dataToVerify = "\x00"; |
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$dataToVerify .= $this->authenticatorData->getRelyingPartyIdHash(); |
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$dataToVerify .= $clientData; |
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$dataToVerify .= $this->authenticatorData->getCredentialId(); |
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$dataToVerify .= $this->authenticatorData->getPublicKeyU2F(); |
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$coseAlgo = $this->getCoseAlgorithm($this->algo); |
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if ($coseAlgo === null) { |
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throw new WebauthnException(sprintf( |
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'Invalid algorithm [%d]', |
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$this->algo |
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)); |
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} |
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return openssl_verify( |
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$dataToVerify, |
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$this->signature, |
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$publicKey, |
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$coseAlgo['openssl'] |
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) === 1; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function validateRootCertificate(array $rootCertificates): bool |
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{ |
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$chain = $this->createX5cChainFile(); |
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if ($chain !== null) { |
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$rootCertificates[] = $chain; |
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} |
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$value = openssl_x509_checkpurpose( |
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$this->getCertificatePem(), |
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-1, |
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$rootCertificates |
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); |
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if ($value === -1) { |
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throw new WebauthnException(sprintf( |
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'Error when validate root certificate, error message: [%s]', |
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openssl_error_string() |
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)); |
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} |
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// TODO phpstan complains so cast to bool |
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return (bool) $value; |
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} |
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} |
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platine-php /
webauthn
