Add user verification to webauthn challenges

Require user verification if all tokens are registered
with UV flag, else discourage it

Signed-off-by: S1m <git@sgougeon.fr>

core/Migrations/Version29000Date20240324113502.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright ?
+ *
+ * @author ?
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Core\Migrations;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\DB\Types;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+/**
+ * Create new column and index for lazy loading in appconfig for the new IAppConfig API.
+ */
+class Version29000Date20240324113502 extends SimpleMigrationStep {
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable('webauthn');
+		$table->addColumn('user_verification', Types::BOOLEAN, ['notnull' => true, 'default' => false]);
+		return $schema;
+	}
+}

lib/composer/composer/autoload_classmap.php

@@ -1276,6 +1276,7 @@
     'OC\\Core\\Migrations\\Version29000Date20240124132201' => $baseDir . '/core/Migrations/Version29000Date20240124132201.php',
     'OC\\Core\\Migrations\\Version29000Date20240124132202' => $baseDir . '/core/Migrations/Version29000Date20240124132202.php',
     'OC\\Core\\Migrations\\Version29000Date20240131122720' => $baseDir . '/core/Migrations/Version29000Date20240131122720.php',
+    'OC\\Core\\Migrations\\Version29000Date20240324113502' => $baseDir . '/core/Migrations/Version29000Date20240324113502.php',
     'OC\\Core\\Notification\\CoreNotifier' => $baseDir . '/core/Notification/CoreNotifier.php',
     'OC\\Core\\Service\\LoginFlowV2Service' => $baseDir . '/core/Service/LoginFlowV2Service.php',
     'OC\\DB\\Adapter' => $baseDir . '/lib/private/DB/Adapter.php',

lib/composer/composer/autoload_static.php

@@ -1309,6 +1309,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Core\\Migrations\\Version29000Date20240124132201' => __DIR__ . '/../../..' . '/core/Migrations/Version29000Date20240124132201.php',
         'OC\\Core\\Migrations\\Version29000Date20240124132202' => __DIR__ . '/../../..' . '/core/Migrations/Version29000Date20240124132202.php',
         'OC\\Core\\Migrations\\Version29000Date20240131122720' => __DIR__ . '/../../..' . '/core/Migrations/Version29000Date20240131122720.php',
+        'OC\\Core\\Migrations\\Version29000Date20240324113502' => __DIR__ . '/../../..' . '/core/Migrations/Version29000Date20240324113502.php',
         'OC\\Core\\Notification\\CoreNotifier' => __DIR__ . '/../../..' . '/core/Notification/CoreNotifier.php',
         'OC\\Core\\Service\\LoginFlowV2Service' => __DIR__ . '/../../..' . '/core/Service/LoginFlowV2Service.php',
         'OC\\DB\\Adapter' => __DIR__ . '/../../..' . '/lib/private/DB/Adapter.php',

lib/private/Authentication/WebAuthn/CredentialRepository.php

@@ -61,7 +61,7 @@ public function findAllForUserEntity(PublicKeyCredentialUserEntity $publicKeyCre
 		}, $entities);
 	}
 
-	public function saveAndReturnCredentialSource(PublicKeyCredentialSource $publicKeyCredentialSource, ?string $name = null): PublicKeyCredentialEntity {
+	public function saveAndReturnCredentialSource(PublicKeyCredentialSource $publicKeyCredentialSource, ?string $name = null, bool $userVerification = false): PublicKeyCredentialEntity {
 		$oldEntity = null;
 
 		try {
@@ -75,7 +75,7 @@ public function saveAndReturnCredentialSource(PublicKeyCredentialSource $publicK
 			$name = 'default';
 		}
 
-		$entity = PublicKeyCredentialEntity::fromPublicKeyCrendentialSource($name, $publicKeyCredentialSource);
+		$entity = PublicKeyCredentialEntity::fromPublicKeyCrendentialSource($name, $publicKeyCredentialSource, $userVerification);
 
 		if ($oldEntity) {
 			$entity->setId($oldEntity->getId());

lib/private/Authentication/WebAuthn/Db/PublicKeyCredentialEntity.php

@@ -41,6 +41,9 @@
  * @method void setPublicKeyCredentialId(string $id);
  * @method string getData();
  * @method void setData(string $data);
+ * @since 29.0.0
+ * @method bool getUserVerification();
+ * @method void setUserVerification(bool $userVerification);
  */
 class PublicKeyCredentialEntity extends Entity implements JsonSerializable {
 	/** @var string */
@@ -55,20 +58,25 @@ class PublicKeyCredentialEntity extends Entity implements JsonSerializable {
 	/** @var string */
 	protected $data;
 
+	/** @var bool */
+	protected $userVerification;
+
 	public function __construct() {
 		$this->addType('name', 'string');
 		$this->addType('uid', 'string');
 		$this->addType('publicKeyCredentialId', 'string');
 		$this->addType('data', 'string');
+		$this->addType('userVerification', 'boolean');
 	}
 
-	public static function fromPublicKeyCrendentialSource(string $name, PublicKeyCredentialSource $publicKeyCredentialSource): PublicKeyCredentialEntity {
+	public static function fromPublicKeyCrendentialSource(string $name, PublicKeyCredentialSource $publicKeyCredentialSource, bool $userVerification): PublicKeyCredentialEntity {
 		$publicKeyCredentialEntity = new self();
 
 		$publicKeyCredentialEntity->setName($name);
 		$publicKeyCredentialEntity->setUid($publicKeyCredentialSource->getUserHandle());
 		$publicKeyCredentialEntity->setPublicKeyCredentialId(base64_encode($publicKeyCredentialSource->getPublicKeyCredentialId()));
 		$publicKeyCredentialEntity->setData(json_encode($publicKeyCredentialSource));
+		$publicKeyCredentialEntity->setUserVerification($userVerification);
 
 		return $publicKeyCredentialEntity;
 	}

lib/private/Authentication/WebAuthn/Manager.php

@@ -107,8 +107,8 @@ public function startRegistration(IUser $user, string $serverHost): PublicKeyCre
 		];
 
 		$authenticatorSelectionCriteria = new AuthenticatorSelectionCriteria(
-			null,
-			AuthenticatorSelectionCriteria::USER_VERIFICATION_REQUIREMENT_DISCOURAGED,
+			AuthenticatorSelectionCriteria::AUTHENTICATOR_ATTACHMENT_NO_PREFERENCE,
+			AuthenticatorSelectionCriteria::USER_VERIFICATION_REQUIREMENT_PREFERRED,
 			null,
 			false,
 		);
@@ -150,6 +150,7 @@ public function finishRegister(PublicKeyCredentialCreationOptions $publicKeyCred
 			// Load the data
 			$publicKeyCredential = $publicKeyCredentialLoader->load($data);
 			$response = $publicKeyCredential->response;
+			$userVerification = $response->getAttestationObject()->getAuthData()->isUserVerified();
 
 			// Check if the response is an Authenticator Attestation Response
 			if (!$response instanceof AuthenticatorAttestationResponse) {
@@ -170,7 +171,7 @@ public function finishRegister(PublicKeyCredentialCreationOptions $publicKeyCred
 		}
 
 		// Persist the data
-		return $this->repository->saveAndReturnCredentialSource($publicKeyCredentialSource, $name);
+		return $this->repository->saveAndReturnCredentialSource($publicKeyCredentialSource, $name, $userVerification);
 	}
 
 	private function stripPort(string $serverHost): string {
@@ -179,7 +180,11 @@ private function stripPort(string $serverHost): string {
 
 	public function startAuthentication(string $uid, string $serverHost): PublicKeyCredentialRequestOptions {
 		// List of registered PublicKeyCredentialDescriptor classes associated to the user
-		$registeredPublicKeyCredentialDescriptors = array_map(function (PublicKeyCredentialEntity $entity) {
+		$userVerificationRequirement = AuthenticatorSelectionCriteria::USER_VERIFICATION_REQUIREMENT_REQUIRED;
+		$registeredPublicKeyCredentialDescriptors = array_map(function (PublicKeyCredentialEntity $entity) use (&$userVerificationRequirement) {
+			if ($entity->getUserVerification() !== true) {
+				$userVerificationRequirement = AuthenticatorSelectionCriteria::USER_VERIFICATION_REQUIREMENT_DISCOURAGED;
+			}
 			$credential = $entity->toPublicKeyCredentialSource();
 			return new PublicKeyCredentialDescriptor(
 				$credential->type,
@@ -192,7 +197,7 @@ public function startAuthentication(string $uid, string $serverHost): PublicKeyC
 			random_bytes(32),                                                          // Challenge
 			$this->stripPort($serverHost),                                             // Relying Party ID
 			$registeredPublicKeyCredentialDescriptors,                                 // Registered PublicKeyCredentialDescriptor classes
-			AuthenticatorSelectionCriteria::USER_VERIFICATION_REQUIREMENT_DISCOURAGED,
+			$userVerificationRequirement,
 			60000,                                                                     // Timeout
 		);
 	}