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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Yii\AuthClient\Signature; |
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use Yiisoft\Yii\AuthClient\Exception\InvalidConfigException; |
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use Yiisoft\Yii\AuthClient\Exception\NotSupportedException; |
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use function function_exists; |
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use function is_int; |
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/** |
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* RsaSha1 represents 'SHAwithRSA' (also known as RSASSA-PKCS1-V1_5-SIGN with the SHA hash) signature method. |
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* |
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* > **Note:** This class requires PHP "OpenSSL" extension({@link https://php.net/manual/en/book.openssl.php}). |
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*/ |
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final class RsaSha extends Signature |
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{ |
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/** |
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* @var string path to the file, which holds private key certificate. |
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*/ |
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private string $privateCertificateFile; |
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/** |
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* @var string path to the file, which holds public key certificate. |
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*/ |
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private string $publicCertificateFile; |
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/** |
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* @var int|string signature hash algorithm, e.g. `OPENSSL_ALGO_SHA1`, `OPENSSL_ALGO_SHA256` and so on. |
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* |
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* @link https://php.net/manual/en/openssl.signature-algos.php |
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*/ |
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private $algorithm; |
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/** |
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* @var string|null OpenSSL private key certificate content. |
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* This value can be fetched from file specified by {@see privateCertificateFile}. |
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*/ |
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private ?string $privateCertificate = null; |
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/** |
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* @var string|null OpenSSL public key certificate content. |
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* This value can be fetched from file specified by {@see publicCertificateFile}. |
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*/ |
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private ?string $publicCertificate = null; |
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public function __construct($algorithm = null) |
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{ |
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$this->algorithm = $algorithm; |
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if (!function_exists('openssl_sign')) { |
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throw new NotSupportedException('PHP "OpenSSL" extension is required.'); |
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} |
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} |
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/** |
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* @param string $publicCertificateFile public key certificate file. |
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*/ |
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public function setPublicCertificateFile(string $publicCertificateFile): void |
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{ |
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$this->publicCertificateFile = $publicCertificateFile; |
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} |
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/** |
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* @param string $privateCertificateFile private key certificate file. |
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*/ |
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public function setPrivateCertificateFile(string $privateCertificateFile): void |
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{ |
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$this->privateCertificateFile = $privateCertificateFile; |
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} |
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3 |
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public function getName(): string |
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{ |
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if (is_int($this->algorithm)) { |
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$constants = get_defined_constants(true); |
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if (isset($constants['openssl'])) { |
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foreach ($constants['openssl'] as $name => $value) { |
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if (strpos($name, 'OPENSSL_ALGO_') !== 0) { |
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continue; |
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} |
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if ($value === $this->algorithm) { |
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$algorithmName = substr($name, strlen('OPENSSL_ALGO_')); |
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break; |
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} |
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} |
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} |
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if (!isset($algorithmName)) { |
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throw new InvalidConfigException("Unable to determine name of algorithm '{$this->algorithm}'"); |
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} |
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} else { |
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$algorithmName = strtoupper($this->algorithm); |
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} |
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return 'RSA-' . $algorithmName; |
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} |
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public function generateSignature(string $baseString, string $key): string |
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{ |
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$privateCertificateContent = $this->getPrivateCertificate(); |
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// Pull the private key ID from the certificate |
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$privateKeyId = openssl_pkey_get_private($privateCertificateContent); |
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// Sign using the key |
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openssl_sign($baseString, $signature, $privateKeyId, $this->algorithm); |
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// Release the key resource |
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if (PHP_MAJOR_VERSION < 8) { |
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openssl_pkey_free($privateKeyId); |
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} |
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return base64_encode($signature); |
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} |
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/** |
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* @return string private key certificate content. |
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*/ |
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public function getPrivateCertificate(): string |
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{ |
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if ($this->privateCertificate === null) { |
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$this->privateCertificate = $this->initPrivateCertificate(); |
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} |
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return $this->privateCertificate; |
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} |
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/** |
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* Creates initial value for {@see privateCertificate}. |
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* This method will attempt to fetch the certificate value from {@see privateCertificateFile} file. |
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* |
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* @throws InvalidConfigException on failure. |
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* |
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* @return string private certificate content. |
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*/ |
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protected function initPrivateCertificate(): string |
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{ |
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if (!empty($this->privateCertificateFile)) { |
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if (!file_exists($this->privateCertificateFile)) { |
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throw new InvalidConfigException( |
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"Private certificate file '{$this->privateCertificateFile}' does not exist!" |
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); |
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} |
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return file_get_contents($this->privateCertificateFile); |
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} |
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return ''; |
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} |
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1 |
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public function verify(string $signature, string $baseString, string $key): bool |
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{ |
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1 |
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$decodedSignature = base64_decode($signature); |
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// Fetch the public key cert based on the request |
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1 |
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$publicCertificate = $this->getPublicCertificate(); |
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// Pull the public key ID from the certificate |
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1 |
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$publicKeyId = openssl_pkey_get_public($publicCertificate); |
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// Check the computed signature against the one passed in the query |
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1 |
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$verificationResult = openssl_verify($baseString, $decodedSignature, $publicKeyId, $this->algorithm); |
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// Release the key resource |
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1 |
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if (PHP_MAJOR_VERSION < 8) { |
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openssl_pkey_free($publicKeyId); |
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} |
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1 |
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return $verificationResult === 1; |
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} |
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/** |
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* @return string public key certificate content. |
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*/ |
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public function getPublicCertificate(): string |
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{ |
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if ($this->publicCertificate === null) { |
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$this->publicCertificate = $this->initPublicCertificate(); |
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} |
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return $this->publicCertificate; |
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} |
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/** |
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* Creates initial value for {@see publicCertificate}. |
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* This method will attempt to fetch the certificate value from {@see publicCertificateFile} file. |
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* |
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* @throws InvalidConfigException on failure. |
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* |
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* @return string public certificate content. |
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*/ |
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protected function initPublicCertificate(): string |
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{ |
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$content = ''; |
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if (!empty($this->publicCertificateFile)) { |
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if (!file_exists($this->publicCertificateFile)) { |
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throw new InvalidConfigException( |
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"Public certificate file '{$this->publicCertificateFile}' does not exist!" |
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); |
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} |
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$fp = fopen($this->publicCertificateFile, 'rb'); |
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while (!feof($fp)) { |
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$content .= fgets($fp); |
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} |
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fclose($fp); |
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} |
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return $content; |
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} |
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} |
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