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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\Module\webauthn\WebAuthn; |
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use Cose\Key\Ec2Key; |
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use Cose\Key\RsaKey; |
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/** |
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* FIDO2/WebAuthn Authentication Processing filter |
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* |
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* Filter for registering or authenticating with a FIDO2/WebAuthn token after |
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* having authenticated with the primary authsource. |
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* |
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* @author Stefan Winter <[email protected]> |
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* @package SimpleSAMLphp |
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*/ |
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class WebAuthnAuthenticationEvent extends WebAuthnAbstractEvent |
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{ |
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/** |
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* Initialize the event object. |
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* |
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* Validates and parses the configuration. |
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* |
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* @param string $pubkeyCredType PublicKeyCredential.type |
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* @param string $scope the scope of the event |
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* @param string $challenge the challenge which was used to trigger this event |
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* @param string $authData the authData binary string |
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* @param string $clientDataJSON the client data JSON string which is present in all types of events |
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* @param string $credentialId the credential ID |
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* @param string $publicKey the public key which is supposed to validate the sig |
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* (COSE format, still needs to be converted to PEM!) |
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* @param string $signature the signature value to verify |
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* @param bool $debugMode print debugging statements? |
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*/ |
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public function __construct( |
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string $pubkeyCredType, |
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string $scope, |
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string $challenge, |
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string $authData, |
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string $clientDataJSON, |
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string $credentialId, |
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string $publicKey, |
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int $algo, |
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string $signature, |
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bool $debugMode = false, |
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) { |
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$this->eventType = "AUTH"; |
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$this->credential = $publicKey; |
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$this->algo = $algo; |
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$this->credentialId = $credentialId; |
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parent::__construct($pubkeyCredType, $scope, $challenge, $authData, $clientDataJSON, $debugMode); |
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$this->validateSignature($authData . $this->clientDataHash, $signature); |
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} |
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/** |
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* @param string $sigData |
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* @param string $signature |
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* @return void |
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*/ |
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private function validateSignature(string $sigData, string $signature): void |
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{ |
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$keyArray = $this->cborDecode(hex2bin($this->credential)); |
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$keyObject = null; |
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switch ($this->algo) { |
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case WebAuthnRegistrationEvent::PK_ALGORITHM_ECDSA: |
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$keyObject = new Ec2Key($keyArray); |
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break; |
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case WebAuthnRegistrationEvent::PK_ALGORITHM_RSA: |
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$keyObject = new RsaKey($keyArray); |
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break; |
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default: |
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$this->fail("Incoming public key algorithm unknown and not supported!"); |
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} |
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$keyResource = openssl_pkey_get_public($keyObject->asPEM()); |
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if ($keyResource === false) { |
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$this->fail("Unable to construct public key resource from PEM (was algo type " . $this->algo . ")."); |
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} |
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/** |
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* §7.2 STEP 17: validate signature |
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*/ |
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$sigcheck = openssl_verify($sigData, $signature, $keyResource, OPENSSL_ALGO_SHA256); |
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switch ($sigcheck) { |
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case 1: |
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$this->pass("Signature validation succeeded!"); |
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break; |
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case 0: |
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$this->fail("Signature validation failed (sigdata = $sigData) (signature = $signature) !"); |
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break; |
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default: |
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$this->fail("There was an error executing the signature check."); |
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break; |
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} |
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} |
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} |
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simplesamlphp /
simplesamlphp-module-webauthn
