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<?php |
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namespace Dudlewebs\WPMCS\s3\Aws\Signature; |
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use Dudlewebs\WPMCS\s3\Aws\Credentials\CredentialsInterface; |
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use Dudlewebs\WPMCS\s3\AWS\CRT\Auth\Signable; |
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use Dudlewebs\WPMCS\s3\AWS\CRT\Auth\SignatureType; |
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use Dudlewebs\WPMCS\s3\AWS\CRT\Auth\Signing; |
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use Dudlewebs\WPMCS\s3\AWS\CRT\Auth\SigningAlgorithm; |
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use Dudlewebs\WPMCS\s3\AWS\CRT\Auth\SigningConfigAWS; |
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use Dudlewebs\WPMCS\s3\AWS\CRT\Auth\StaticCredentialsProvider; |
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use Dudlewebs\WPMCS\s3\AWS\CRT\HTTP\Request; |
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use Dudlewebs\WPMCS\s3\Aws\Exception\CommonRuntimeException; |
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use Dudlewebs\WPMCS\s3\Aws\Exception\CouldNotCreateChecksumException; |
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use Dudlewebs\WPMCS\s3\GuzzleHttp\Psr7; |
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use Dudlewebs\WPMCS\s3\Psr\Http\Message\RequestInterface; |
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/** |
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* Signature Version 4 |
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* @link http://docs.aws.amazon.com/general/latest/gr/signature-version-4.html |
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*/ |
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class SignatureV4 implements SignatureInterface |
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{ |
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use SignatureTrait; |
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const ISO8601_BASIC = 'Ymd\\THis\\Z'; |
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const UNSIGNED_PAYLOAD = 'UNSIGNED-PAYLOAD'; |
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const AMZ_CONTENT_SHA256_HEADER = 'X-Amz-Content-Sha256'; |
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/** @var string */ |
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private $service; |
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/** @var string */ |
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protected $region; |
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/** @var bool */ |
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private $unsigned; |
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/** @var bool */ |
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private $useV4a; |
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/** |
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* The following headers are not signed because signing these headers |
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* would potentially cause a signature mismatch when sending a request |
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* through a proxy or if modified at the HTTP client level. |
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* |
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* @return array |
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*/ |
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protected function getHeaderBlacklist() |
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{ |
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return ['cache-control' => \true, 'content-type' => \true, 'content-length' => \true, 'expect' => \true, 'max-forwards' => \true, 'pragma' => \true, 'range' => \true, 'te' => \true, 'if-match' => \true, 'if-none-match' => \true, 'if-modified-since' => \true, 'if-unmodified-since' => \true, 'if-range' => \true, 'accept' => \true, 'authorization' => \true, 'proxy-authorization' => \true, 'from' => \true, 'referer' => \true, 'user-agent' => \true, 'X-Amz-User-Agent' => \true, 'x-amzn-trace-id' => \true, 'aws-sdk-invocation-id' => \true, 'aws-sdk-retry' => \true]; |
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} |
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/** |
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* @param string $service Service name to use when signing |
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* @param string $region Region name to use when signing |
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* @param array $options Array of configuration options used when signing |
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* - unsigned-body: Flag to make request have unsigned payload. |
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* Unsigned body is used primarily for streaming requests. |
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*/ |
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public function __construct($service, $region, array $options = []) |
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{ |
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$this->service = $service; |
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$this->region = $region; |
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$this->unsigned = isset($options['unsigned-body']) ? $options['unsigned-body'] : \false; |
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$this->useV4a = isset($options['use_v4a']) && $options['use_v4a'] === \true; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function signRequest(RequestInterface $request, CredentialsInterface $credentials, $signingService = null) |
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{ |
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$ldt = \gmdate(self::ISO8601_BASIC); |
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$sdt = \substr($ldt, 0, 8); |
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$parsed = $this->parseRequest($request); |
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$parsed['headers']['X-Amz-Date'] = [$ldt]; |
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if ($token = $credentials->getSecurityToken()) { |
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$parsed['headers']['X-Amz-Security-Token'] = [$token]; |
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} |
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$service = isset($signingService) ? $signingService : $this->service; |
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if ($this->useV4a) { |
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return $this->signWithV4a($credentials, $request, $service); |
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} |
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$cs = $this->createScope($sdt, $this->region, $service); |
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$payload = $this->getPayload($request); |
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if ($payload == self::UNSIGNED_PAYLOAD) { |
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$parsed['headers'][self::AMZ_CONTENT_SHA256_HEADER] = [$payload]; |
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} |
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$context = $this->createContext($parsed, $payload); |
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$toSign = $this->createStringToSign($ldt, $cs, $context['creq']); |
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$signingKey = $this->getSigningKey($sdt, $this->region, $service, $credentials->getSecretKey()); |
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$signature = \hash_hmac('sha256', $toSign, $signingKey); |
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$parsed['headers']['Authorization'] = ["AWS4-HMAC-SHA256 " . "Credential={$credentials->getAccessKeyId()}/{$cs}, " . "SignedHeaders={$context['headers']}, Signature={$signature}"]; |
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return $this->buildRequest($parsed); |
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} |
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/** |
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* Get the headers that were used to pre-sign the request. |
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* Used for the X-Amz-SignedHeaders header. |
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* |
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* @param array $headers |
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* @return array |
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*/ |
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private function getPresignHeaders(array $headers) |
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{ |
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$presignHeaders = []; |
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$blacklist = $this->getHeaderBlacklist(); |
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foreach ($headers as $name => $value) { |
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$lName = \strtolower($name); |
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if (!isset($blacklist[$lName]) && $name !== self::AMZ_CONTENT_SHA256_HEADER) { |
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$presignHeaders[] = $lName; |
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} |
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} |
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return $presignHeaders; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function presign(RequestInterface $request, CredentialsInterface $credentials, $expires, array $options = []) |
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{ |
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$startTimestamp = isset($options['start_time']) ? $this->convertToTimestamp($options['start_time'], null) : \time(); |
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$expiresTimestamp = $this->convertToTimestamp($expires, $startTimestamp); |
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$parsed = $this->createPresignedRequest($request, $credentials); |
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$payload = $this->getPresignedPayload($request); |
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$httpDate = \gmdate(self::ISO8601_BASIC, $startTimestamp); |
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$shortDate = \substr($httpDate, 0, 8); |
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$scope = $this->createScope($shortDate, $this->region, $this->service); |
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$credential = $credentials->getAccessKeyId() . '/' . $scope; |
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if ($credentials->getSecurityToken()) { |
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unset($parsed['headers']['X-Amz-Security-Token']); |
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} |
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$parsed['query']['X-Amz-Algorithm'] = 'AWS4-HMAC-SHA256'; |
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$parsed['query']['X-Amz-Credential'] = $credential; |
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$parsed['query']['X-Amz-Date'] = \gmdate('Ymd\\THis\\Z', $startTimestamp); |
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$parsed['query']['X-Amz-SignedHeaders'] = \implode(';', $this->getPresignHeaders($parsed['headers'])); |
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$parsed['query']['X-Amz-Expires'] = $this->convertExpires($expiresTimestamp, $startTimestamp); |
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$context = $this->createContext($parsed, $payload); |
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$stringToSign = $this->createStringToSign($httpDate, $scope, $context['creq']); |
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$key = $this->getSigningKey($shortDate, $this->region, $this->service, $credentials->getSecretKey()); |
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$parsed['query']['X-Amz-Signature'] = \hash_hmac('sha256', $stringToSign, $key); |
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return $this->buildRequest($parsed); |
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} |
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/** |
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* Converts a POST request to a GET request by moving POST fields into the |
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* query string. |
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* |
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* Useful for pre-signing query protocol requests. |
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* |
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* @param RequestInterface $request Request to clone |
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* |
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* @return RequestInterface |
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* @throws \InvalidArgumentException if the method is not POST |
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*/ |
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public static function convertPostToGet(RequestInterface $request, $additionalQueryParams = "") |
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{ |
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if ($request->getMethod() !== 'POST') { |
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throw new \InvalidArgumentException('Expected a POST request but ' . 'received a ' . $request->getMethod() . ' request.'); |
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} |
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$sr = $request->withMethod('GET')->withBody(Psr7\Utils::streamFor(''))->withoutHeader('Content-Type')->withoutHeader('Content-Length'); |
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// Move POST fields to the query if they are present |
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if ($request->getHeaderLine('Content-Type') === 'application/x-www-form-urlencoded') { |
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$body = (string) $request->getBody() . $additionalQueryParams; |
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$sr = $sr->withUri($sr->getUri()->withQuery($body)); |
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} |
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return $sr; |
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} |
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protected function getPayload(RequestInterface $request) |
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{ |
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if ($this->unsigned && $request->getUri()->getScheme() == 'https') { |
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return self::UNSIGNED_PAYLOAD; |
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} |
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// Calculate the request signature payload |
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if ($request->hasHeader(self::AMZ_CONTENT_SHA256_HEADER)) { |
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// Handle streaming operations (e.g. Glacier.UploadArchive) |
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return $request->getHeaderLine(self::AMZ_CONTENT_SHA256_HEADER); |
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} |
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if (!$request->getBody()->isSeekable()) { |
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throw new CouldNotCreateChecksumException('sha256'); |
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} |
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try { |
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return Psr7\Utils::hash($request->getBody(), 'sha256'); |
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} catch (\Exception $e) { |
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throw new CouldNotCreateChecksumException('sha256', $e); |
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} |
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} |
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protected function getPresignedPayload(RequestInterface $request) |
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{ |
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return $this->getPayload($request); |
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} |
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protected function createCanonicalizedPath($path) |
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{ |
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$doubleEncoded = \rawurlencode(\ltrim($path, '/')); |
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return '/' . \str_replace('%2F', '/', $doubleEncoded); |
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} |
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private function createStringToSign($longDate, $credentialScope, $creq) |
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{ |
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$hash = \hash('sha256', $creq); |
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return "AWS4-HMAC-SHA256\n{$longDate}\n{$credentialScope}\n{$hash}"; |
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} |
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private function createPresignedRequest(RequestInterface $request, CredentialsInterface $credentials) |
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{ |
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$parsedRequest = $this->parseRequest($request); |
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// Make sure to handle temporary credentials |
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if ($token = $credentials->getSecurityToken()) { |
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$parsedRequest['headers']['X-Amz-Security-Token'] = [$token]; |
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} |
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return $this->moveHeadersToQuery($parsedRequest); |
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} |
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/** |
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* @param array $parsedRequest |
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* @param string $payload Hash of the request payload |
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* @return array Returns an array of context information |
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*/ |
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private function createContext(array $parsedRequest, $payload) |
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{ |
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$blacklist = $this->getHeaderBlacklist(); |
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// Normalize the path as required by SigV4 |
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$canon = $parsedRequest['method'] . "\n" . $this->createCanonicalizedPath($parsedRequest['path']) . "\n" . $this->getCanonicalizedQuery($parsedRequest['query']) . "\n"; |
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// Case-insensitively aggregate all of the headers. |
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$aggregate = []; |
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foreach ($parsedRequest['headers'] as $key => $values) { |
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$key = \strtolower($key); |
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if (!isset($blacklist[$key])) { |
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foreach ($values as $v) { |
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$aggregate[$key][] = $v; |
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} |
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} |
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} |
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\ksort($aggregate); |
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$canonHeaders = []; |
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foreach ($aggregate as $k => $v) { |
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if (\count($v) > 0) { |
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\sort($v); |
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} |
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$canonHeaders[] = $k . ':' . \preg_replace('/\\s+/', ' ', \implode(',', $v)); |
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} |
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$signedHeadersString = \implode(';', \array_keys($aggregate)); |
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$canon .= \implode("\n", $canonHeaders) . "\n\n" . $signedHeadersString . "\n" . $payload; |
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return ['creq' => $canon, 'headers' => $signedHeadersString]; |
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} |
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private function getCanonicalizedQuery(array $query) |
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{ |
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unset($query['X-Amz-Signature']); |
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if (!$query) { |
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return ''; |
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} |
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$qs = ''; |
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\ksort($query); |
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foreach ($query as $k => $v) { |
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if (!\is_array($v)) { |
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$qs .= \rawurlencode($k) . '=' . \rawurlencode($v !== null ? $v : '') . '&'; |
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} else { |
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\sort($v); |
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foreach ($v as $value) { |
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$qs .= \rawurlencode($k) . '=' . \rawurlencode($value !== null ? $value : '') . '&'; |
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} |
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} |
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} |
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return \substr($qs, 0, -1); |
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} |
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private function convertToTimestamp($dateValue, $relativeTimeBase = null) |
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{ |
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if ($dateValue instanceof \DateTimeInterface) { |
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$timestamp = $dateValue->getTimestamp(); |
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} elseif (!\is_numeric($dateValue)) { |
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$timestamp = \strtotime($dateValue, $relativeTimeBase === null ? \time() : $relativeTimeBase); |
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} else { |
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$timestamp = $dateValue; |
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} |
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return $timestamp; |
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} |
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private function convertExpires($expiresTimestamp, $startTimestamp) |
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{ |
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$duration = $expiresTimestamp - $startTimestamp; |
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// Ensure that the duration of the signature is not longer than a week |
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if ($duration > 604800) { |
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throw new \InvalidArgumentException('The expiration date of a ' . 'signature version 4 presigned URL must be less than one ' . 'week'); |
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} |
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return $duration; |
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} |
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private function moveHeadersToQuery(array $parsedRequest) |
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{ |
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//x-amz-user-agent shouldn't be put in a query param |
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unset($parsedRequest['headers']['X-Amz-User-Agent']); |
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foreach ($parsedRequest['headers'] as $name => $header) { |
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$lname = \strtolower($name); |
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if (\substr($lname, 0, 5) == 'x-amz') { |
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$parsedRequest['query'][$name] = $header; |
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} |
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$blacklist = $this->getHeaderBlacklist(); |
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if (isset($blacklist[$lname]) || $lname === \strtolower(self::AMZ_CONTENT_SHA256_HEADER)) { |
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unset($parsedRequest['headers'][$name]); |
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} |
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} |
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return $parsedRequest; |
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} |
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private function parseRequest(RequestInterface $request) |
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{ |
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// Clean up any previously set headers. |
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/** @var RequestInterface $request */ |
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$request = $request->withoutHeader('X-Amz-Date')->withoutHeader('Date')->withoutHeader('Authorization'); |
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$uri = $request->getUri(); |
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return ['method' => $request->getMethod(), 'path' => $uri->getPath(), 'query' => Psr7\Query::parse($uri->getQuery()), 'uri' => $uri, 'headers' => $request->getHeaders(), 'body' => $request->getBody(), 'version' => $request->getProtocolVersion()]; |
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} |
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private function buildRequest(array $req) |
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{ |
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if ($req['query']) { |
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$req['uri'] = $req['uri']->withQuery(Psr7\Query::build($req['query'])); |
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} |
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return new Psr7\Request($req['method'], $req['uri'], $req['headers'], $req['body'], $req['version']); |
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} |
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/** |
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* @param CredentialsInterface $credentials |
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* @param RequestInterface $request |
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* @param $signingService |
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* @return RequestInterface |
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*/ |
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protected function signWithV4a(CredentialsInterface $credentials, RequestInterface $request, $signingService) |
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{ |
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if (!\extension_loaded('awscrt')) { |
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throw new CommonRuntimeException("AWS Common Runtime for PHP is required to use Signature V4A" . ". Please install it using the instructions found at" . " https://github.com/aws/aws-sdk-php/blob/master/CRT_INSTRUCTIONS.md"); |
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} |
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$credentials_provider = new StaticCredentialsProvider(['access_key_id' => $credentials->getAccessKeyId(), 'secret_access_key' => $credentials->getSecretKey(), 'session_token' => $credentials->getSecurityToken()]); |
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$sha = $this->getPayload($request); |
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$signingConfig = new SigningConfigAWS(['algorithm' => SigningAlgorithm::SIGv4_ASYMMETRIC, 'signature_type' => SignatureType::HTTP_REQUEST_HEADERS, 'credentials_provider' => $credentials_provider, 'signed_body_value' => $sha, 'region' => "*", 'service' => $signingService, 'date' => \time()]); |
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$sha = $this->getPayload($request); |
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$invocationId = $request->getHeader("aws-sdk-invocation-id"); |
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$retry = $request->getHeader("aws-sdk-retry"); |
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$request = $request->withoutHeader("aws-sdk-invocation-id"); |
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$request = $request->withoutHeader("aws-sdk-retry"); |
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$http_request = new Request($request->getMethod(), (string) $request->getUri(), [], \array_map(function ($header) { |
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return $header[0]; |
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}, $request->getHeaders())); |
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Signing::signRequestAws(Signable::fromHttpRequest($http_request), $signingConfig, function ($signing_result, $error_code) use(&$http_request) { |
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$signing_result->applyToHttpRequest($http_request); |
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}); |
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$sigV4AHeaders = $http_request->headers(); |
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foreach ($sigV4AHeaders->toArray() as $h => $v) { |
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$request = $request->withHeader($h, $v); |
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} |
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$request = $request->withHeader("aws-sdk-invocation-id", $invocationId); |
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$request = $request->withHeader("x-amz-content-sha256", $sha); |
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$request = $request->withHeader("aws-sdk-retry", $retry); |
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$request = $request->withHeader("x-amz-region-set", "*"); |
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return $request; |
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} |
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} |
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|
