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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2018 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace U2FAuthentication\Fido2\AttestationStatement; |
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use Assert\Assertion; |
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use Base64Url\Base64Url; |
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use CBOR\CBORObject; |
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use CBOR\Decoder; |
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use CBOR\MapObject; |
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use CBOR\StringStream; |
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use U2FAuthentication\Fido2\AttestedCredentialData; |
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use U2FAuthentication\Fido2\AuthenticationExtensions\AuthenticationExtension; |
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use U2FAuthentication\Fido2\AuthenticationExtensions\AuthenticationExtensionsClientOutputs; |
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use U2FAuthentication\Fido2\AuthenticatorData; |
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class AttestationObjectLoader |
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{ |
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private const FLAG_AT = 0b01000000; |
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private const FLAG_ED = 0b10000000; |
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private $decoder; |
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public function __construct(Decoder $decoder) |
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{ |
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$this->decoder = $decoder; |
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} |
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public function load(string $data): AttestationObject |
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{ |
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$decodedData = Base64Url::decode($data); |
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$stream = new StringStream($decodedData); |
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$attestationObject = $this->decoder->decode($stream)->getNormalizedData(); |
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$authData = $attestationObject['authData']; |
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$authDataStream = new StringStream($authData); |
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$rp_id_hash = $authDataStream->read(32); |
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$flags = $authDataStream->read(1); |
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$signCount = $authDataStream->read(4); |
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$signCount = unpack('N', $signCount)[1]; |
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$attestedCredentialData = null; |
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if (\ord($flags) & self::FLAG_AT) { |
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$aaguid = $authDataStream->read(16); |
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$credentialLength = $authDataStream->read(2); |
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$credentialLength = unpack('n', $credentialLength)[1]; |
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$credentialId = $authDataStream->read($credentialLength); |
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$credentialPublicKey = $this->decoder->decode($authDataStream); |
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Assertion::isInstanceOf($credentialPublicKey, MapObject::class, 'The data does not contain a valid credential public key.'); |
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$attestedCredentialData = new AttestedCredentialData($aaguid, $credentialId, (string) $credentialPublicKey); |
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} |
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$extension = null; |
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if (\ord($flags) & self::FLAG_ED) { |
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$extension = $this->decoder->decode($authDataStream); |
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$extension = $this->retrieveExtensions($extension); |
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} |
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$authenticatorData = new AuthenticatorData($authData, $rp_id_hash, $flags, $signCount, $attestedCredentialData, $extension); |
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return new AttestationObject($data, new AttestationStatement($attestationObject['fmt'], $attestationObject['attStmt']), $authenticatorData); |
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} |
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private function retrieveExtensions(CBORObject $object): AuthenticationExtensionsClientOutputs |
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{ |
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Assertion::isInstanceOf(MapObject::class, $object, 'Invalid extension object'); |
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$data = $object->getNormalizedData(); |
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Assertion::isArray($data, 'Invalid extension object'); |
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$extensions = new AuthenticationExtensionsClientOutputs(); |
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foreach ($data as $key => $value) { |
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Assertion::string($key, 'Invalid extension key'); |
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$extensions->add(new AuthenticationExtension($key, $value)); |
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} |
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return $extensions; |
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} |
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} |
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Spomky-Labs /
u2f-php
