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<?php |
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/** |
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* Copyright 2014 SURFnet bv |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace Surfnet\YubikeyApiClient\Service; |
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use Surfnet\YubikeyApiClient\Crypto\NonceGenerator; |
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use Surfnet\YubikeyApiClient\Crypto\Signer; |
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use Surfnet\YubikeyApiClient\Exception\InvalidArgumentException; |
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use Surfnet\YubikeyApiClient\Exception\RequestResponseMismatchException; |
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use Surfnet\YubikeyApiClient\Exception\UntrustedSignatureException; |
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use Surfnet\YubikeyApiClient\Http\ServerPoolClient; |
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use Surfnet\YubikeyApiClient\Otp; |
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class VerificationService |
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{ |
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/** |
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* @var ServerPoolClient |
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*/ |
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private $httpClient; |
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/** |
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* @var Signer |
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*/ |
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private $signer; |
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/** |
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* @var string Yubico client ID |
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*/ |
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private $clientId; |
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/** |
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* @var NonceGenerator |
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*/ |
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private $nonceGenerator; |
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/** |
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* @param ServerPoolClient $httpClient |
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* @param NonceGenerator $nonceGenerator |
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* @param Signer $signer |
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* @param string $clientId |
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*/ |
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public function __construct(ServerPoolClient $httpClient, NonceGenerator $nonceGenerator, Signer $signer, $clientId) |
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{ |
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if (!is_string($clientId)) { |
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throw new InvalidArgumentException('Client ID must be string.'); |
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} |
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$this->httpClient = $httpClient; |
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$this->signer = $signer; |
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$this->clientId = $clientId; |
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$this->nonceGenerator = $nonceGenerator; |
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} |
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/** |
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* @param Otp $otp |
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* @return OtpVerificationResult |
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* @throws UntrustedSignatureException When the signature doesn't match the expected signature. |
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* @throws RequestResponseMismatchException When the response data doesn't match the requested data (otp, nonce). |
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*/ |
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public function verify(Otp $otp) |
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{ |
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$nonce = $this->nonceGenerator->generateNonce(); |
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$query = [ |
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'id' => $this->clientId, |
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'otp' => $otp->otp, |
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'nonce' => $nonce, |
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]; |
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$query = $this->signer->sign($query); |
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$httpResponse = $this->httpClient->get(['query' => $query]); |
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$response = $this->parseYubicoResponse((string) $httpResponse->getBody()); |
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if (!$this->signer->verifySignature($response)) { |
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throw new UntrustedSignatureException('The response data signature doesn\'t match the expected signature.'); |
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} |
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if ($response['otp'] !== $otp->otp) { |
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throw new RequestResponseMismatchException('The response OTP doesn\'t match the requested OTP.'); |
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} |
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if ($response['nonce'] !== $nonce) { |
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throw new RequestResponseMismatchException('The response nonce doesn\'t match the requested nonce.'); |
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} |
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return new OtpVerificationResult($response['status']); |
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} |
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/** |
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* Parses the response. |
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* |
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* @param string $response |
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* @return array |
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*/ |
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private function parseYubicoResponse($response) |
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{ |
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$lines = array_filter(explode("\r\n", $response)); |
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$responseArray = array(); |
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foreach ($lines as $line) { |
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list($key, $value) = explode('=', $line, 2); |
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$responseArray[$key] = $value; |
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} |
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return $responseArray; |
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} |
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} |
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SURFnet /
yubikey-api-client
