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<?php |
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use WAYF\OCSP; |
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use WAYF\X509; |
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include_once 'lib/X509.php'; |
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include_once 'lib/Ocsp.php'; |
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define('OCSP_CERT_EXPIRED', 1); |
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define('OCSP_NO_ISSUER', 2); |
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define('OCSP_NO_RESPONSE', 3); |
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define('OCSP_RESPONSE_STATUS', 4); |
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define('OCSP_CERT_STATUS', 5); |
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define('OCSP_CERT_MISMATCH', 6); |
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define('OCSP_RESPONSE_TIME_EARLY', 7); |
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define('OCSP_RESPONSE_TIME_INVALID', 8); |
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define('OCSP_CERT_STATUS_GOOD', 1); |
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define('OCSP_CERT_STATUS_REVOKED', 2); |
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define('OCSP_CERT_STATUS_UNKOWN', 3); |
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class OCSPException extends Exception { |
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private $status; |
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public function setCertStatus($status) { |
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$this->status = $status; |
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} |
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public function getCertStatus() { |
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if (!$this->status) { |
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return; |
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} |
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if ($this->code !== OCSP_CERT_STATUS) { |
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return; |
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} |
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return match ($this->status) { |
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'good' => OCSP_CERT_STATUS_GOOD, |
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'revoked' => OCSP_CERT_STATUS_REVOKED, |
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default => OCSP_CERT_STATUS_UNKOWN, |
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}; |
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} |
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} |
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function tempErrorHandler($errno, $errstr, $errfile, $errline) { |
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return true; |
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} |
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class Certificate { |
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private $cert; |
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private $data; |
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public function __construct($cert, $issuer = '') { |
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// XXX: error handling |
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$this->data = openssl_x509_parse($cert); |
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$this->cert = $cert; |
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$this->issuer = $issuer; |
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} |
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/** |
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* The name of the certificate in DN notation. |
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* |
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* @return string the name of the certificate |
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*/ |
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public function getName() { |
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return $this->data['name']; |
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} |
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/** |
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* Issuer of the certificate. |
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* |
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* @return string The issuer of the certificate in DN notation |
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*/ |
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public function getIssuerName() { |
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$issuer = ''; |
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foreach ($this->data['issuer'] as $key => $value) { |
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$issuer .= "/{$key}={$value}"; |
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} |
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return $issuer; |
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} |
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/** |
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* Converts X509 DER format string to PEM format. |
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* |
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* @param string X509 Certificate in DER format |
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* @param mixed $cert |
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* |
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* @return string X509 Certificate in PEM format |
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*/ |
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protected function der2pem($cert) { |
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return "-----BEGIN CERTIFICATE-----\n" . chunk_split(base64_encode((string) $cert), 64, "\n") . "-----END CERTIFICATE-----\n"; |
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} |
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/** |
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* Converts X509 PEM format string to DER format. |
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* |
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* @param string X509 Certificate in PEM format |
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* @param mixed $pem_data |
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* |
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* @return string X509 Certificate in DER format |
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*/ |
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protected function pem2der($pem_data) { |
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$begin = "CERTIFICATE-----"; |
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$end = "-----END"; |
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$pem_data = substr((string) $pem_data, strpos((string) $pem_data, $begin) + strlen($begin)); |
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$pem_data = substr($pem_data, 0, strpos($pem_data, $end)); |
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return base64_decode($pem_data); |
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} |
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/** |
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* The subject/emailAddress or subjectAltName. |
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* |
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* @return string The email address belonging to the certificate |
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*/ |
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public function emailAddress() { |
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$certEmailAddress = ""; |
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// If subject/emailAddress is not set, try subjectAltName |
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if (isset($this->data['subject']['emailAddress'])) { |
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$certEmailAddress = $this->data['subject']['emailAddress']; |
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} |
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elseif (isset($this->data['extensions'], $this->data['extensions']['subjectAltName']) |
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) { |
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// Example [subjectAltName] => email:[email protected] |
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$tmp = explode('email:', $this->data['extensions']['subjectAltName']); |
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// Only get the first match |
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if (isset($tmp[1]) && !empty($tmp[1])) { |
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$certEmailAddress = $tmp[1]; |
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} |
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} |
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return $certEmailAddress; |
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} |
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/** |
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* Return the certificate in DER format. |
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* |
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* @return string certificate in DER format |
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*/ |
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public function der() { |
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return $this->pem2der($this->cert); |
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} |
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/** |
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* Return the certificate in PEM format. |
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* |
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* @return string certificate in PEM format |
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*/ |
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public function pem() { |
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return $this->cert; |
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} |
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/** |
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* The beginning of the valid period of the certificate. |
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* |
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* @return int timestamp from which the certificate is valid |
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*/ |
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public function validFrom() { |
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return $this->data['validFrom_time_t']; |
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} |
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/** |
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* The end of the valid period of the certificate. |
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* |
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* @return int timestamp from which the certificate is invalid |
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*/ |
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public function validTo() { |
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return $this->data['validTo_time_t']; |
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} |
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/** |
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* Determines if the certificate is valid. |
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* |
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* @return bool the valid status |
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*/ |
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public function valid() { |
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$time = time(); |
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return $time > $this->validFrom() && $time < $this->validTo(); |
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} |
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/** |
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* The caURL of the certififcate. |
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* |
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* @return string return an empty string or the CA URL |
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*/ |
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public function caURL() { |
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$authorityInfoAccess = $this->authorityInfoAccess(); |
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if (preg_match("/CA Issuers - URI:(.*)/", $authorityInfoAccess, $matches)) { |
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return array_pop($matches); |
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} |
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return ''; |
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} |
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/** |
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* The OCSP URL of the certificate. |
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* |
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* @return string return an empty string or the OCSP URL |
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*/ |
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public function ocspURL() { |
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$authorityInfoAccess = $this->authorityInfoAccess(); |
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if (preg_match("/OCSP - URI:(.*)/", $authorityInfoAccess, $matches)) { |
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return array_pop($matches); |
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} |
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return ''; |
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} |
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/** |
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* Internal helper to obtain the authorityInfoAccess information. |
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* |
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* @return string authorityInfoAccess if set |
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*/ |
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protected function authorityInfoAccess() { |
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if (!isset($this->data['extensions'])) { |
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return ''; |
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} |
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if (!isset($this->data['extensions']['authorityInfoAccess'])) { |
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return ''; |
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} |
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return $this->data['extensions']['authorityInfoAccess']; |
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} |
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/** |
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* The fingerprint (hash) of the certificate body. |
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* |
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* @param string hash_algorithm either sha1 or md5 |
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* @param mixed $hash_algorithm |
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* |
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* @return string the hash of the certificate's body |
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*/ |
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public function fingerprint($hash_algorithm = "md5") { |
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$body = str_replace('-----BEGIN CERTIFICATE-----', '', $this->cert); |
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$body = str_replace('-----END CERTIFICATE-----', '', $body); |
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$body = base64_decode($body); |
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if ($hash_algorithm === 'sha1') { |
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$fingerprint = sha1($body); |
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} |
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else { |
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$fingerprint = md5($body); |
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} |
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// Format 1000AB as 10:00:AB |
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return strtoupper(implode(':', str_split($fingerprint, 2))); |
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} |
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252
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/** |
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* The issuer of this certificate. |
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* |
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255
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* @return Certificate the issuer certificate |
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256
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*/ |
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public function issuer() { |
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if (!empty($this->issuer)) { |
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return $this->issuer; |
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} |
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$cert = ''; |
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$ch = curl_init(); |
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curl_setopt($ch, CURLOPT_URL, $this->caURL()); |
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curl_setopt($ch, CURLOPT_FAILONERROR, true); |
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); |
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267
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// HTTP Proxy settings |
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if (defined('PLUGIN_SMIME_PROXY') && PLUGIN_SMIME_PROXY != '') { |
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curl_setopt($ch, CURLOPT_PROXY, PLUGIN_SMIME_PROXY); |
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} |
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if (defined('PLUGIN_SMIME_PROXY_PORT') && PLUGIN_SMIME_PROXY_PORT != '') { |
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curl_setopt($ch, CURLOPT_PROXYPORT, PLUGIN_SMIME_PROXY_PORT); |
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} |
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if (defined('PLUGIN_SMIME_PROXY_USERPWD') && PLUGIN_SMIME_PROXY_USERPWD != '') { |
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curl_setopt($ch, CURLOPT_PROXYUSERPWD, PLUGIN_SMIME_PROXY_USERPWD); |
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} |
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$output = curl_exec($ch); |
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$http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE); |
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$curl_error = curl_error($ch); |
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if (!$curl_error && $http_status === 200) { |
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$cert = $this->der2pem($output); |
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} |
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else { |
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Log::Write(LOGLEVEL_ERROR, sprintf("[smime] Error when downloading internmediate certificate '%s', http status: '%s'", $curl_error, $http_status)); |
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} |
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curl_close($ch); |
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289
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return new Certificate($cert); |
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} |
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291
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292
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/** |
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293
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* Set the issuer of a certificate. |
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294
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* |
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295
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* @param string the issuer certificate |
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296
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* @param mixed $issuer |
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297
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*/ |
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298
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public function setIssuer($issuer) { |
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299
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if (is_object($issuer)) { |
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$this->issuer = $issuer; |
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301
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} |
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} |
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303
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304
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/** |
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305
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* Verify the certificate status using OCSP. |
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306
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* |
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307
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* @return bool verification succeeded or failed |
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308
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*/ |
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309
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public function verify() { |
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310
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$message = []; |
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311
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312
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if (!$this->valid()) { |
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313
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throw new OCSPException('Certificate expired', OCSP_CERT_EXPIRED); |
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314
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} |
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315
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316
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$issuer = $this->issuer(); |
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317
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if (!is_object($issuer)) { |
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318
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throw new OCSPException('No issuer', OCSP_NO_ISSUER); |
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319
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} |
|
320
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321
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/* Set custom error handler since the nemid ocsp library uses |
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322
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* trigger_error() to throw errors when it cannot parse certain |
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323
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* x509 fields which are not required for the OCSP Request. |
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324
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* Also when receiving the OCSP request, the OCSP library |
|
325
|
|
|
* triggers errors when the request does not adhere to the |
|
326
|
|
|
* standard. |
|
327
|
|
|
*/ |
|
328
|
|
|
set_error_handler("tempErrorHandler"); |
|
329
|
|
|
|
|
330
|
|
|
$x509 = new X509(); |
|
331
|
|
|
$issuer = $x509->certificate($issuer->der()); |
|
332
|
|
|
$certificate = $x509->certificate($this->der()); |
|
333
|
|
|
|
|
334
|
|
|
$ocspclient = new OCSP(); |
|
335
|
|
|
$certID = $ocspclient->certOcspID( |
|
336
|
|
|
[ |
|
337
|
|
|
'issuerName' => $issuer['tbsCertificate']['subject_der'], |
|
338
|
|
|
// remember to skip the first byte it is the number of |
|
339
|
|
|
// unused bits and it is always 0 for keys and certificates |
|
340
|
|
|
'issuerKey' => substr((string) $issuer['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'], 1), |
|
341
|
|
|
'serialNumber_der' => $certificate['tbsCertificate']['serialNumber_der'], |
|
342
|
|
|
], |
|
343
|
|
|
'sha1' |
|
344
|
|
|
); |
|
345
|
|
|
|
|
346
|
|
|
$ocspreq = $ocspclient->request([$certID]); |
|
347
|
|
|
|
|
348
|
|
|
$stream_options = [ |
|
349
|
|
|
'http' => [ |
|
350
|
|
|
'ignore_errors' => false, |
|
351
|
|
|
'method' => 'POST', |
|
352
|
|
|
'header' => 'Content-type: application/ocsp-request' . "\r\n", |
|
353
|
|
|
'content' => $ocspreq, |
|
354
|
|
|
'timeout' => 1, |
|
355
|
|
|
], |
|
356
|
|
|
]; |
|
357
|
|
|
|
|
358
|
|
|
$ocspUrl = $this->ocspURL(); |
|
359
|
|
|
// The OCSP URL is empty, import certificate, but show a warning. |
|
360
|
|
|
if (strlen($ocspUrl) == 0) { |
|
361
|
|
|
throw new OCSPException('The OCSP URL is empty', OCSP_NO_RESPONSE); |
|
362
|
|
|
} |
|
363
|
|
|
// Do the OCSP request |
|
364
|
|
|
$context = stream_context_create($stream_options); |
|
365
|
|
|
$derresponse = file_get_contents($ocspUrl, false, $context); |
|
366
|
|
|
// OCSP service not available, import certificate, but show a warning. |
|
367
|
|
|
if ($derresponse === false) { |
|
368
|
|
|
throw new OCSPException('No response', OCSP_NO_RESPONSE); |
|
369
|
|
|
} |
|
370
|
|
|
$ocspresponse = $ocspclient->response($derresponse); |
|
371
|
|
|
|
|
372
|
|
|
// Restore the previous error handler |
|
373
|
|
|
restore_error_handler(); |
|
374
|
|
|
|
|
375
|
|
|
// responseStatuses: successful, malformedRequest, |
|
376
|
|
|
// internalError, tryLater, sigRequired, unauthorized. |
|
377
|
|
|
if (isset($ocspresponse['responseStatus']) && |
|
378
|
|
|
$ocspresponse['responseStatus'] !== 'successful') { |
|
379
|
|
|
throw new OCSPException('Response status' . $ocspresponse['responseStatus'], OCSP_RESPONSE_STATUS); |
|
380
|
|
|
} |
|
381
|
|
|
|
|
382
|
|
|
$resp = $ocspresponse['responseBytes']['BasicOCSPResponse']['tbsResponseData']['responses'][0]; |
|
383
|
|
|
/* |
|
384
|
|
|
* OCSP response status, possible values are: good, revoked, |
|
385
|
|
|
* unknown according to the RFC |
|
386
|
|
|
* https://www.ietf.org/rfc/rfc2560.txt |
|
387
|
|
|
*/ |
|
388
|
|
|
if ($resp['certStatus'] !== 'good') { |
|
389
|
|
|
// Certificate status is not good, revoked or unknown |
|
390
|
|
|
$exception = new OCSPException('Certificate status ' . $resp['certStatus'], OCSP_CERT_STATUS); |
|
391
|
|
|
$exception->setCertStatus($resp['certStatus']); |
|
392
|
|
|
|
|
393
|
|
|
throw $exception; |
|
394
|
|
|
} |
|
395
|
|
|
|
|
396
|
|
|
/* Check if: |
|
397
|
|
|
* - hash algorithm is equal |
|
398
|
|
|
* - check if issuerNamehash is the same from response |
|
399
|
|
|
* - check if issuerKeyHash is the same from response |
|
400
|
|
|
* - check if serialNumber is the same from response |
|
401
|
|
|
*/ |
|
402
|
|
|
if ($resp['certID']['hashAlgorithm'] !== 'sha1' && |
|
403
|
|
|
$resp['certID']['issuerNameHash'] !== $certID['issuerNameHash'] && |
|
404
|
|
|
$resp['certID']['issuerKeyHash'] !== $certID['issuerKeyHash'] && |
|
405
|
|
|
$resp['certID']['serialNumber'] !== $certID['serialNumber']) { |
|
406
|
|
|
// OCSP Revocation, mismatch between original and checked certificate |
|
407
|
|
|
throw new OCSPException('Certificate mismatch', OCSP_CERT_MISMATCH); |
|
408
|
|
|
} |
|
409
|
|
|
|
|
410
|
|
|
// check if OCSP revocation update is recent |
|
411
|
|
|
$now = new DateTime(gmdate('YmdHis\Z')); |
|
412
|
|
|
$thisUpdate = new DateTime($resp['thisUpdate']); |
|
413
|
|
|
|
|
414
|
|
|
// Check if update time is earlier then our own time |
|
415
|
|
|
if (!isset($resp['nextupdate']) && $thisUpdate > $now) { |
|
416
|
|
|
throw new OCSPException('Update time earlier then our own time', OCSP_RESPONSE_TIME_EARLY); |
|
417
|
|
|
} |
|
418
|
|
|
|
|
419
|
|
|
// Current time should be between thisUpdate and nextUpdate. |
|
420
|
|
|
if ($thisUpdate > $now && $now > new DateTime($resp['nextUpdate'])) { |
|
421
|
|
|
// OCSP Revocation status not current |
|
422
|
|
|
throw new OCSPException('Current time not between thisUpdate and nextUpdate', OCSP_RESPONSE_TIME_INVALID); |
|
423
|
|
|
} |
|
424
|
|
|
} |
|
425
|
|
|
} |
|
426
|
|
|
|
grommunio /
grommunio-web
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This check looks for parameters that have been defined for a function or method, but which are not used in the method body.