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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\Fido; |
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use Assert\Assertion; |
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use Base64Url\Base64Url; |
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class SignatureResponse |
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{ |
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/** |
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* @var ClientData |
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*/ |
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private $clientData; |
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/** |
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* @var KeyHandler |
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*/ |
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private $keyHandle; |
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/** |
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* @var bool |
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*/ |
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private $userPresence; |
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/** |
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* @var string |
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*/ |
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private $userPresenceByte; |
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/** |
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* @var int |
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*/ |
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private $counter; |
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/** |
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* @var string |
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*/ |
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private $counterBytes; |
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/** |
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* @var string |
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*/ |
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private $signature; |
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public function __construct(array $data) |
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{ |
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Assertion::false(array_key_exists('errorCode', $data) && 0 !== $data['errorCode'], 'Invalid response.'); |
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$this->keyHandle = $this->retrieveKeyHandle($data); |
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$this->clientData = $this->retrieveClientData($data); |
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Assertion::eq('navigator.id.getAssertion', $this->clientData->getType(), 'Invalid response.'); |
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list($this->userPresence, $this->userPresenceByte, $this->counter, $this->counterBytes, $this->signature) = $this->extractSignatureData($data); |
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} |
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public function getClientData(): ClientData |
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{ |
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return $this->clientData; |
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} |
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public function getKeyHandle(): KeyHandler |
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{ |
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return $this->keyHandle; |
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} |
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public function isUserPresent(): bool |
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{ |
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return $this->userPresence; |
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} |
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public function getCounter(): int |
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{ |
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return $this->counter; |
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} |
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public function getSignature(): string |
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{ |
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return $this->signature; |
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} |
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private function retrieveKeyHandle(array $data): KeyHandler |
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{ |
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Assertion::false(!array_key_exists('keyHandle', $data) || !\is_string($data['keyHandle']), 'Invalid response.'); |
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return new KeyHandler(Base64Url::decode($data['keyHandle'])); |
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} |
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private function retrieveClientData(array $data): ClientData |
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{ |
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Assertion::false(!array_key_exists('clientData', $data) || !\is_string($data['clientData']), 'Invalid response.'); |
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return new ClientData($data['clientData']); |
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} |
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private function extractSignatureData(array $data): array |
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{ |
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Assertion::false(!array_key_exists('signatureData', $data) || !\is_string($data['signatureData']), 'Invalid response.'); |
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$stream = \Safe\fopen('php://memory', 'r+'); |
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$signatureData = Base64Url::decode($data['signatureData']); |
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\Safe\fwrite($stream, $signatureData); |
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\Safe\rewind($stream); |
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try { |
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$userPresenceByte = \Safe\fread($stream, 1); |
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Assertion::eq(1, mb_strlen($userPresenceByte, '8bit'), 'Invalid response.'); |
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$userPresence = (bool) \ord($userPresenceByte); |
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$counterBytes = \Safe\fread($stream, 4); |
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Assertion::eq(4, mb_strlen($counterBytes, '8bit'), 'Invalid response.'); |
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$counter = unpack('Nctr', $counterBytes)['ctr']; |
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$signature = ''; |
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while (!feof($stream)) { |
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$signature .= \Safe\fread($stream, 1024); |
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} |
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\Safe\fclose($stream); |
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} catch (\Throwable $throwable) { |
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\Safe\fclose($stream); |
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throw $throwable; |
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} |
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return [ |
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$userPresence, |
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$userPresenceByte, |
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$counter, |
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$counterBytes, |
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$signature, |
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]; |
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} |
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public function isValid(SignatureRequest $request, ?int $currentCounter = null): bool |
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{ |
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if (!hash_equals($request->getChallenge(), $this->clientData->getChallenge())) { |
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return false; |
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} |
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if (!hash_equals($request->getApplicationId(), $this->clientData->getOrigin())) { |
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return false; |
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} |
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if (null !== $currentCounter && $currentCounter >= $this->counter) { |
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return false; |
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} |
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$dataToVerify = hash('sha256', $this->clientData->getOrigin(), true); |
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$dataToVerify .= $this->userPresenceByte; |
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$dataToVerify .= $this->counterBytes; |
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$dataToVerify .= hash('sha256', $this->clientData->getRawData(), true); |
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$registeredKey = $request->getRegisteredKey($this->keyHandle); |
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return 1 === openssl_verify($dataToVerify, $this->signature, $registeredKey->getPublicKeyAsPem(), OPENSSL_ALGO_SHA256); |
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} |
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} |
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Spomky-Labs /
u2f-php
