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<?php |
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/** |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace ChampsLibres\WopiLib\Service; |
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use ChampsLibres\WopiLib\Contract\Service\Clock\ClockInterface; |
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use ChampsLibres\WopiLib\Contract\Service\Discovery\DiscoveryInterface; |
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use ChampsLibres\WopiLib\Contract\Service\ProofValidatorInterface; |
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use ChampsLibres\WopiLib\Contract\Service\WopiInterface; |
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use DateTimeImmutable; |
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use phpseclib3\Crypt\PublicKeyLoader; |
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use phpseclib3\Crypt\RSA; |
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use Psr\Http\Message\RequestInterface; |
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use Throwable; |
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use function strlen; |
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final class ProofValidator implements ProofValidatorInterface |
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{ |
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private ClockInterface $clock; |
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private DiscoveryInterface $discovery; |
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public function __construct(DiscoveryInterface $discovery, ClockInterface $clock) |
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{ |
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$this->discovery = $discovery; |
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$this->clock = $clock; |
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} |
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public function isValid(RequestInterface $request): bool |
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{ |
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$timestamp = $request->getHeaderLine(WopiInterface::HEADER_TIMESTAMP); |
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// Ensure that the X-WOPI-TimeStamp header is no more than 20 minutes old. |
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$date = (new DateTimeImmutable())->setTimestamp((int) (((float) $timestamp - 621355968000000000) / 10000000)); |
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if (20 * 60 < ($this->clock->now()->getTimestamp() - $date->getTimestamp())) { |
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return false; |
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} |
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$params = []; |
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parse_str($request->getUri()->getQuery(), $params); |
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$url = (string) $request->getUri(); |
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$expected = sprintf( |
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'%s%s%s%s%s%s', |
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pack('N', strlen($params['access_token'])), |
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$params['access_token'], |
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pack('N', strlen($url)), |
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strtoupper($url), |
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pack('N', 8), |
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pack('J', $timestamp) |
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); |
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$key = $this->discovery->getPublicKey(); |
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$keyOld = $this->discovery->getPublicKeyOld(); |
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$xWopiProof = $request->getHeaderLine(WopiInterface::HEADER_PROOF); |
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$xWopiProofOld = $request->getHeaderLine(WopiInterface::HEADER_PROOF_OLD); |
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return $this->verify($expected, $xWopiProof, $key) |
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|| $this->verify($expected, $xWopiProofOld, $key) |
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|| $this->verify($expected, $xWopiProof, $keyOld); |
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} |
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/** |
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* @param string $key The key in MSBLOB format |
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*/ |
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private function verify(string $expected, string $proof, string $key): bool |
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{ |
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try { |
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/** @var RSA $key */ |
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$key = PublicKeyLoader::loadPublicKey($key); |
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} catch (Throwable $e) { |
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return false; |
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} |
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return $key |
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->withHash('sha256') |
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->withPadding(RSA::SIGNATURE_RELAXED_PKCS1) |
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->verify($expected, (string) base64_decode($proof, true)); |
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} |
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} |
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Champs-Libres /
wopi-lib
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