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<?php |
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namespace SimpleSAML\Module\webauthn\Controller; |
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use Exception; |
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use SimpleSAML\Auth; |
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use SimpleSAML\Configuration; |
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use SimpleSAML\Error; |
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use SimpleSAML\HTTP\RunnableResponse; |
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use SimpleSAML\Logger; |
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use SimpleSAML\Module; |
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use SimpleSAML\Module\webauthn\WebAuthn\WebAuthnAbstractEvent; |
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use SimpleSAML\Module\webauthn\WebAuthn\WebAuthnAuthenticationEvent; |
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use SimpleSAML\Session; |
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use SimpleSAML\Utils; |
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use SimpleSAML\XHTML\Template; |
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use Symfony\Component\HttpFoundation\Request; |
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use Symfony\Component\HttpFoundation\RedirectResponse; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\HttpFoundation\StreamedResponse; |
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/** |
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* Controller class for the webauthn module. |
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* |
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* This class serves the different views available in the module. |
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* |
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* @package SimpleSAML\Module\webauthn |
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*/ |
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class AuthProcess |
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{ |
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/** @var \SimpleSAML\Configuration */ |
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protected $config; |
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/** @var \SimpleSAML\Session */ |
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protected $session; |
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/** |
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* @var \SimpleSAML\Auth\State|string |
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* @psalm-var \SimpleSAML\Auth\State|class-string |
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*/ |
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protected $authState = Auth\State::class; |
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/** |
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* @var \SimpleSAML\Logger|string |
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* @psalm-var \SimpleSAML\Logger|class-string |
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*/ |
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protected $logger = Logger::class; |
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/** |
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* Controller constructor. |
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* |
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* It initializes the global configuration and session for the controllers implemented here. |
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* |
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* @param \SimpleSAML\Configuration $config The configuration to use by the controllers. |
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* @param \SimpleSAML\Session $session The session to use by the controllers. |
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* |
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* @throws \Exception |
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*/ |
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public function __construct( |
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Configuration $config, |
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Session $session |
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) { |
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$this->config = $config; |
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$this->session = $session; |
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} |
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/** |
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* Inject the \SimpleSAML\Auth\State dependency. |
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* |
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* @param \SimpleSAML\Auth\State $authState |
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*/ |
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public function setAuthState(Auth\State $authState): void |
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{ |
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$this->authState = $authState; |
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} |
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/** |
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* Inject the \SimpleSAML\Logger dependency. |
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* |
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* @param \SimpleSAML\Logger $logger |
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*/ |
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public function setLogger(Logger $logger): void |
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{ |
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$this->logger = $logger; |
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} |
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/** |
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* @param \Symfony\Component\HttpFoundation\Request $request |
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* @return \Symfony\Component\HttpFoundation\RedirectResponse|\SimpleSAML\HTTP\RunnableResponse|\Symfony\Component\HttpFoundation\StreamedResponse |
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* A Symfony Response-object. |
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*/ |
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public function main(Request $request): Response |
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{ |
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if (session_status() != PHP_SESSION_ACTIVE) { |
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session_cache_limiter('nocache'); |
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} |
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$this->logger::info('FIDO2 - Accessing WebAuthn enrollment validation'); |
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$stateId = $request->query->get('StateId'); |
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if ($stateId === null) { |
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throw new Error\BadRequest('Missing required StateId query parameter.'); |
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} |
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$debugEnabled = $this->config->getValue('logging.level', Logger::NOTICE) === Logger::DEBUG; |
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/** @var array $state */ |
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$state = Auth\State::loadState($stateId, 'webauthn:request'); |
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$incomingID = bin2hex(WebAuthnAbstractEvent::base64urlDecode($request->request->get('response_id'))); |
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/** |
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* §7.2 STEP 2 - 4 : check that the credential is one of those the particular user owns |
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*/ |
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$publicKey = false; |
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$previousCounter = -1; |
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foreach ($state['FIDO2Tokens'] as $oneToken) { |
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if ($oneToken[0] == $incomingID) { |
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// Credential ID is eligible for user $state['FIDO2Username']; |
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// using publicKey $oneToken[1] with current counter value $oneToken[2] |
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$publicKey = $oneToken[1]; |
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$previousCounter = $oneToken[2]; |
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break; |
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} |
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} |
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if ($publicKey === false) { |
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throw new Exception( |
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"User attempted to authenticate with an unknown credential ID. This should already have been prevented by the browser!" |
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); |
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} |
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/** @psalm-var array $oneToken */ |
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$authObject = new WebAuthnAuthenticationEvent( |
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$request->request->get('type'), |
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($state['FIDO2Scope'] === null ? $state['FIDO2DerivedScope'] : $state['FIDO2Scope']), |
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$state['FIDO2SignupChallenge'], |
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$state['IdPMetadata']['entityid'], |
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base64_decode($request->request->get('authenticator_data')), |
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base64_decode($request->request->get('client_data_raw')), |
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$oneToken[0], |
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$oneToken[1], |
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base64_decode($request->request->get('signature')), |
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$debugEnabled |
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); |
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/** |
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* §7.2 STEP 18 : detect physical object cloning on the token |
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*/ |
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$counter = $authObject->getCounter(); |
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if (($previousCounter != 0 || $counter != 0) && $counter > $previousCounter) { |
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// Signature counter was incremented compared to last time, good |
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$store = $state['webauthn:store']; |
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$store->updateSignCount($oneToken[0], $counter); |
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} else { |
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throw new Exception( |
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"Signature counter less or equal to a previous authentication! Token cloning likely (old: $previousCounter, new: $counter." |
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); |
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} |
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// THAT'S IT. The user authenticated successfully. Remember the credential ID that was used. |
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$state['FIDO2AuthSuccessful'] = $oneToken[0]; |
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// See if he wants to hang around for token management operations |
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if ($request->request->get('credentialChange') === 'on') { |
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$state['FIDO2WantsRegister'] = true; |
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} else { |
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$state['FIDO2WantsRegister'] = false; |
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} |
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$this->authState::saveState($state, 'webauthn:request'); |
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if ($debugEnabled) { |
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$response = new StreamedResponse(); |
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$response->setCallback(function ($authObject, $state) { |
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echo $authObject->getDebugBuffer(); |
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echo $authObject->getValidateBuffer(); |
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echo "Debug mode, not continuing to " . ($state['FIDO2WantsRegister'] ? "credential registration page." : "destination."); |
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}); |
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return $response; |
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} else { |
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if ($state['FIDO2WantsRegister']) { |
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return new RedirectResponse(Module::getModuleURL('webauthn/webauthn.php?StateId=' . urlencode($stateId))); |
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} else { |
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return new RunnableResponse([Auth\ProcessingChain::class, 'resumeProcessing'], [$state]); |
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} |
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} |
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} |
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} |
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simplesamlphp /
simplesamlphp-module-webauthn
