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efrain |
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<?php
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namespace lbuchs\WebAuthn\Attestation\Format;
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use lbuchs\WebAuthn\WebAuthnException;
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use lbuchs\WebAuthn\Attestation\AuthenticatorData;
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abstract class FormatBase {
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protected $_attestationObject = null;
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protected $_authenticatorData = null;
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protected $_x5c_chain = array();
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protected $_x5c_tempFile = null;
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/**
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*
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* @param Array $AttestionObject
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* @param AuthenticatorData $authenticatorData
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*/
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public function __construct($AttestionObject, AuthenticatorData $authenticatorData) {
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$this->_attestationObject = $AttestionObject;
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$this->_authenticatorData = $authenticatorData;
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}
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/**
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*
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*/
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public function __destruct() {
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// delete X.509 chain certificate file after use
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if ($this->_x5c_tempFile && \is_file($this->_x5c_tempFile)) {
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\unlink($this->_x5c_tempFile);
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}
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}
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/**
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* returns the certificate chain in PEM format
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* @return string|null
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*/
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public function getCertificateChain() {
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if ($this->_x5c_tempFile && \is_file($this->_x5c_tempFile)) {
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return \file_get_contents($this->_x5c_tempFile);
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}
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return null;
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}
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/**
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* returns the key X.509 certificate in PEM format
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* @return string
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*/
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public function getCertificatePem() {
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// need to be overwritten
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return null;
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}
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/**
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* checks validity of the signature
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* @param string $clientDataHash
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* @return bool
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* @throws WebAuthnException
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*/
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public function validateAttestation($clientDataHash) {
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// need to be overwritten
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return false;
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}
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/**
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* validates the certificate against root certificates
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* @param array $rootCas
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* @return boolean
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* @throws WebAuthnException
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*/
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public function validateRootCertificate($rootCas) {
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// need to be overwritten
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return false;
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}
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/**
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* create a PEM encoded certificate with X.509 binary data
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* @param string $x5c
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* @return string
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*/
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protected function _createCertificatePem($x5c) {
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$pem = '-----BEGIN CERTIFICATE-----' . "\n";
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$pem .= \chunk_split(\base64_encode($x5c), 64, "\n");
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$pem .= '-----END CERTIFICATE-----' . "\n";
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return $pem;
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}
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/**
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* creates a PEM encoded chain file
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* @return type
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*/
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protected function _createX5cChainFile() {
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$content = '';
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if (\is_array($this->_x5c_chain) && \count($this->_x5c_chain) > 0) {
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foreach ($this->_x5c_chain as $x5c) {
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$certInfo = \openssl_x509_parse($this->_createCertificatePem($x5c));
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// check if certificate is self signed
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if (\is_array($certInfo) && \is_array($certInfo['issuer']) && \is_array($certInfo['subject'])) {
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$selfSigned = false;
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$subjectKeyIdentifier = $certInfo['extensions']['subjectKeyIdentifier'] ?? null;
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$authorityKeyIdentifier = $certInfo['extensions']['authorityKeyIdentifier'] ?? null;
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if ($authorityKeyIdentifier && substr($authorityKeyIdentifier, 0, 6) === 'keyid:') {
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$authorityKeyIdentifier = substr($authorityKeyIdentifier, 6);
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}
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if ($subjectKeyIdentifier && substr($subjectKeyIdentifier, 0, 6) === 'keyid:') {
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$subjectKeyIdentifier = substr($subjectKeyIdentifier, 6);
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}
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if (($subjectKeyIdentifier && !$authorityKeyIdentifier) || ($authorityKeyIdentifier && $authorityKeyIdentifier === $subjectKeyIdentifier)) {
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$selfSigned = true;
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}
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if (!$selfSigned) {
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$content .= "\n" . $this->_createCertificatePem($x5c) . "\n";
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}
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}
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}
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}
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if ($content) {
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$this->_x5c_tempFile = \tempnam(\sys_get_temp_dir(), 'x5c_');
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if (\file_put_contents($this->_x5c_tempFile, $content) !== false) {
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return $this->_x5c_tempFile;
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}
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}
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return null;
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}
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/**
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* returns the name and openssl key for provided cose number.
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* @param int $coseNumber
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* @return \stdClass|null
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*/
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protected function _getCoseAlgorithm($coseNumber) {
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// https://www.iana.org/assignments/cose/cose.xhtml#algorithms
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$coseAlgorithms = array(
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array(
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'hash' => 'SHA1',
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'openssl' => OPENSSL_ALGO_SHA1,
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'cose' => array(
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-65535 // RS1
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)),
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array(
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'hash' => 'SHA256',
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'openssl' => OPENSSL_ALGO_SHA256,
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'cose' => array(
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-257, // RS256
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-37, // PS256
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-7, // ES256
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5 // HMAC256
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)),
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array(
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'hash' => 'SHA384',
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'openssl' => OPENSSL_ALGO_SHA384,
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'cose' => array(
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-258, // RS384
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-38, // PS384
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-35, // ES384
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6 // HMAC384
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)),
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array(
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'hash' => 'SHA512',
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'openssl' => OPENSSL_ALGO_SHA512,
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'cose' => array(
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-259, // RS512
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-39, // PS512
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-36, // ES512
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7 // HMAC512
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))
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);
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foreach ($coseAlgorithms as $coseAlgorithm) {
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if (\in_array($coseNumber, $coseAlgorithm['cose'], true)) {
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$return = new \stdClass();
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$return->hash = $coseAlgorithm['hash'];
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$return->openssl = $coseAlgorithm['openssl'];
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return $return;
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}
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}
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return null;
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}
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}
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