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4fc5eaeff0
The app id might be misleading, the federation app is for syncing addressbooks with trusted servers. It is not always enabled and show not have to be. Signed-off-by: Joas Schilling <coding@schilljs.com>
467 lines
17 KiB
PHP
467 lines
17 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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namespace OCA\CloudFederationAPI\Controller;
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use NCU\Federation\ISignedCloudFederationProvider;
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use NCU\Security\Signature\Exceptions\IdentityNotFoundException;
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use NCU\Security\Signature\Exceptions\IncomingRequestException;
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use NCU\Security\Signature\Exceptions\SignatoryNotFoundException;
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use NCU\Security\Signature\Exceptions\SignatureException;
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use NCU\Security\Signature\Exceptions\SignatureNotFoundException;
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use NCU\Security\Signature\IIncomingSignedRequest;
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use NCU\Security\Signature\ISignatureManager;
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use OC\OCM\OCMSignatoryManager;
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use OCA\CloudFederationAPI\Config;
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use OCA\CloudFederationAPI\ResponseDefinitions;
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use OCA\FederatedFileSharing\AddressHandler;
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use OCP\AppFramework\Controller;
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use OCP\AppFramework\Http;
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use OCP\AppFramework\Http\Attribute\BruteForceProtection;
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use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
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use OCP\AppFramework\Http\Attribute\OpenAPI;
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use OCP\AppFramework\Http\Attribute\PublicPage;
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use OCP\AppFramework\Http\JSONResponse;
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use OCP\Federation\Exceptions\ActionNotSupportedException;
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use OCP\Federation\Exceptions\AuthenticationFailedException;
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use OCP\Federation\Exceptions\BadRequestException;
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use OCP\Federation\Exceptions\ProviderCouldNotAddShareException;
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use OCP\Federation\Exceptions\ProviderDoesNotExistsException;
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use OCP\Federation\ICloudFederationFactory;
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use OCP\Federation\ICloudFederationProviderManager;
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use OCP\Federation\ICloudIdManager;
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use OCP\IAppConfig;
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use OCP\IGroupManager;
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use OCP\IRequest;
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use OCP\IURLGenerator;
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use OCP\IUserManager;
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use OCP\Share\Exceptions\ShareNotFound;
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use OCP\Util;
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use Psr\Log\LoggerInterface;
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/**
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* Open-Cloud-Mesh-API
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*
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* @package OCA\CloudFederationAPI\Controller
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*
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* @psalm-import-type CloudFederationAPIAddShare from ResponseDefinitions
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* @psalm-import-type CloudFederationAPIValidationError from ResponseDefinitions
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* @psalm-import-type CloudFederationAPIError from ResponseDefinitions
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*/
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#[OpenAPI(scope: OpenAPI::SCOPE_FEDERATION)]
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class RequestHandlerController extends Controller {
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public function __construct(
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string $appName,
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IRequest $request,
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private LoggerInterface $logger,
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private IUserManager $userManager,
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private IGroupManager $groupManager,
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private IURLGenerator $urlGenerator,
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private ICloudFederationProviderManager $cloudFederationProviderManager,
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private Config $config,
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private readonly AddressHandler $addressHandler,
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private readonly IAppConfig $appConfig,
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private ICloudFederationFactory $factory,
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private ICloudIdManager $cloudIdManager,
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private readonly ISignatureManager $signatureManager,
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private readonly OCMSignatoryManager $signatoryManager,
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) {
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parent::__construct($appName, $request);
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}
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/**
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* Add share
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*
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* @param string $shareWith The user who the share will be shared with
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* @param string $name The resource name (e.g. document.odt)
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* @param string|null $description Share description
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* @param string $providerId Resource UID on the provider side
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* @param string $owner Provider specific UID of the user who owns the resource
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* @param string|null $ownerDisplayName Display name of the user who shared the item
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* @param string|null $sharedBy Provider specific UID of the user who shared the resource
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* @param string|null $sharedByDisplayName Display name of the user who shared the resource
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* @param array{name: list<string>, options: array<string, mixed>} $protocol e,.g. ['name' => 'webdav', 'options' => ['username' => 'john', 'permissions' => 31]]
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* @param string $shareType 'group' or 'user' share
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* @param string $resourceType 'file', 'calendar',...
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*
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* @return JSONResponse<Http::STATUS_CREATED, CloudFederationAPIAddShare, array{}>|JSONResponse<Http::STATUS_BAD_REQUEST, CloudFederationAPIValidationError, array{}>|JSONResponse<Http::STATUS_NOT_IMPLEMENTED, CloudFederationAPIError, array{}>
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*
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* 201: The notification was successfully received. The display name of the recipient might be returned in the body
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* 400: Bad request due to invalid parameters, e.g. when `shareWith` is not found or required properties are missing
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* 501: Share type or the resource type is not supported
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*/
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#[PublicPage]
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#[NoCSRFRequired]
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#[BruteForceProtection(action: 'receiveFederatedShare')]
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public function addShare($shareWith, $name, $description, $providerId, $owner, $ownerDisplayName, $sharedBy, $sharedByDisplayName, $protocol, $shareType, $resourceType) {
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try {
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// if request is signed and well signed, no exception are thrown
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// if request is not signed and host is known for not supporting signed request, no exception are thrown
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$signedRequest = $this->getSignedRequest();
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$this->confirmSignedOrigin($signedRequest, 'owner', $owner);
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} catch (IncomingRequestException $e) {
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$this->logger->warning('incoming request exception', ['exception' => $e]);
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return new JSONResponse(['message' => $e->getMessage(), 'validationErrors' => []], Http::STATUS_BAD_REQUEST);
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}
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// check if all required parameters are set
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if ($shareWith === null ||
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$name === null ||
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$providerId === null ||
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$resourceType === null ||
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$shareType === null ||
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!is_array($protocol) ||
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!isset($protocol['name']) ||
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!isset($protocol['options']) ||
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!is_array($protocol['options']) ||
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!isset($protocol['options']['sharedSecret'])
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) {
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return new JSONResponse(
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[
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'message' => 'Missing arguments',
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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}
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$supportedShareTypes = $this->config->getSupportedShareTypes($resourceType);
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if (!in_array($shareType, $supportedShareTypes)) {
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return new JSONResponse(
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['message' => 'Share type "' . $shareType . '" not implemented'],
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Http::STATUS_NOT_IMPLEMENTED
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);
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}
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$cloudId = $this->cloudIdManager->resolveCloudId($shareWith);
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$shareWith = $cloudId->getUser();
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if ($shareType === 'user') {
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$shareWith = $this->mapUid($shareWith);
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if (!$this->userManager->userExists($shareWith)) {
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$response = new JSONResponse(
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[
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'message' => 'User "' . $shareWith . '" does not exists at ' . $this->urlGenerator->getBaseUrl(),
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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$response->throttle();
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return $response;
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}
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}
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if ($shareType === 'group') {
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if (!$this->groupManager->groupExists($shareWith)) {
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$response = new JSONResponse(
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[
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'message' => 'Group "' . $shareWith . '" does not exists at ' . $this->urlGenerator->getBaseUrl(),
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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$response->throttle();
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return $response;
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}
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}
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// if no explicit display name is given, we use the uid as display name
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$ownerDisplayName = $ownerDisplayName === null ? $owner : $ownerDisplayName;
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$sharedByDisplayName = $sharedByDisplayName === null ? $sharedBy : $sharedByDisplayName;
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// sharedBy* parameter is optional, if nothing is set we assume that it is the same user as the owner
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if ($sharedBy === null) {
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$sharedBy = $owner;
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$sharedByDisplayName = $ownerDisplayName;
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}
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try {
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$provider = $this->cloudFederationProviderManager->getCloudFederationProvider($resourceType);
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$share = $this->factory->getCloudFederationShare($shareWith, $name, $description, $providerId, $owner, $ownerDisplayName, $sharedBy, $sharedByDisplayName, '', $shareType, $resourceType);
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$share->setProtocol($protocol);
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$provider->shareReceived($share);
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} catch (ProviderDoesNotExistsException|ProviderCouldNotAddShareException $e) {
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return new JSONResponse(
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['message' => $e->getMessage()],
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Http::STATUS_NOT_IMPLEMENTED
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);
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} catch (\Exception $e) {
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$this->logger->error($e->getMessage(), ['exception' => $e]);
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return new JSONResponse(
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[
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'message' => 'Internal error at ' . $this->urlGenerator->getBaseUrl(),
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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}
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$responseData = ['recipientDisplayName' => ''];
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if ($shareType === 'user') {
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$user = $this->userManager->get($shareWith);
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if ($user) {
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$responseData = [
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'recipientDisplayName' => $user->getDisplayName(),
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'recipientUserId' => $user->getUID(),
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];
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}
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}
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return new JSONResponse($responseData, Http::STATUS_CREATED);
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}
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/**
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* Send a notification about an existing share
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*
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* @param string $notificationType Notification type, e.g. SHARE_ACCEPTED
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* @param string $resourceType calendar, file, contact,...
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* @param string|null $providerId ID of the share
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* @param array<string, mixed>|null $notification The actual payload of the notification
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*
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* @return JSONResponse<Http::STATUS_CREATED, array<string, mixed>, array{}>|JSONResponse<Http::STATUS_BAD_REQUEST, CloudFederationAPIValidationError, array{}>|JSONResponse<Http::STATUS_FORBIDDEN|Http::STATUS_NOT_IMPLEMENTED, CloudFederationAPIError, array{}>
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*
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* 201: The notification was successfully received
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* 400: Bad request due to invalid parameters, e.g. when `type` is invalid or missing
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* 403: Getting resource is not allowed
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* 501: The resource type is not supported
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*/
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#[NoCSRFRequired]
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#[PublicPage]
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#[BruteForceProtection(action: 'receiveFederatedShareNotification')]
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public function receiveNotification($notificationType, $resourceType, $providerId, ?array $notification) {
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// check if all required parameters are set
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if ($notificationType === null ||
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$resourceType === null ||
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$providerId === null ||
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!is_array($notification)
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) {
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return new JSONResponse(
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[
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'message' => 'Missing arguments',
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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}
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try {
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// if request is signed and well signed, no exception are thrown
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// if request is not signed and host is known for not supporting signed request, no exception are thrown
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$signedRequest = $this->getSignedRequest();
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$this->confirmNotificationIdentity($signedRequest, $resourceType, $notification);
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} catch (IncomingRequestException $e) {
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$this->logger->warning('incoming request exception', ['exception' => $e]);
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return new JSONResponse(['message' => $e->getMessage(), 'validationErrors' => []], Http::STATUS_BAD_REQUEST);
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}
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try {
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$provider = $this->cloudFederationProviderManager->getCloudFederationProvider($resourceType);
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$result = $provider->notificationReceived($notificationType, $providerId, $notification);
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} catch (ProviderDoesNotExistsException $e) {
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return new JSONResponse(
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[
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'message' => $e->getMessage(),
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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} catch (ShareNotFound $e) {
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$response = new JSONResponse(
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[
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'message' => $e->getMessage(),
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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$response->throttle();
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return $response;
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} catch (ActionNotSupportedException $e) {
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return new JSONResponse(
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['message' => $e->getMessage()],
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Http::STATUS_NOT_IMPLEMENTED
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);
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} catch (BadRequestException $e) {
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return new JSONResponse($e->getReturnMessage(), Http::STATUS_BAD_REQUEST);
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} catch (AuthenticationFailedException $e) {
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$response = new JSONResponse(['message' => 'RESOURCE_NOT_FOUND'], Http::STATUS_FORBIDDEN);
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$response->throttle();
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return $response;
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} catch (\Exception $e) {
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$this->logger->warning('incoming notification exception', ['exception' => $e]);
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return new JSONResponse(
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[
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'message' => 'Internal error at ' . $this->urlGenerator->getBaseUrl(),
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'validationErrors' => [],
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],
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Http::STATUS_BAD_REQUEST
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);
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}
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return new JSONResponse($result, Http::STATUS_CREATED);
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}
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/**
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* map login name to internal LDAP UID if a LDAP backend is in use
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*
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* @param string $uid
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* @return string mixed
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*/
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private function mapUid($uid) {
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// FIXME this should be a method in the user management instead
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$this->logger->debug('shareWith before, ' . $uid, ['app' => $this->appName]);
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Util::emitHook(
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'\OCA\Files_Sharing\API\Server2Server',
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'preLoginNameUsedAsUserName',
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['uid' => &$uid]
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);
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$this->logger->debug('shareWith after, ' . $uid, ['app' => $this->appName]);
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return $uid;
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}
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/**
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* returns signed request if available.
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* throw an exception:
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* - if request is signed, but wrongly signed
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* - if request is not signed but instance is configured to only accept signed ocm request
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*
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* @return IIncomingSignedRequest|null null if remote does not (and never did) support signed request
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* @throws IncomingRequestException
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*/
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private function getSignedRequest(): ?IIncomingSignedRequest {
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try {
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$signedRequest = $this->signatureManager->getIncomingSignedRequest($this->signatoryManager);
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$this->logger->debug('signed request available', ['signedRequest' => $signedRequest]);
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return $signedRequest;
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} catch (SignatureNotFoundException|SignatoryNotFoundException $e) {
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$this->logger->debug('remote does not support signed request', ['exception' => $e]);
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// remote does not support signed request.
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// currently we still accept unsigned request until lazy appconfig
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// core.enforce_signed_ocm_request is set to true (default: false)
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if ($this->appConfig->getValueBool('core', OCMSignatoryManager::APPCONFIG_SIGN_ENFORCED, lazy: true)) {
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$this->logger->notice('ignored unsigned request', ['exception' => $e]);
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throw new IncomingRequestException('Unsigned request');
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}
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} catch (SignatureException $e) {
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$this->logger->warning('wrongly signed request', ['exception' => $e]);
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throw new IncomingRequestException('Invalid signature');
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}
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return null;
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}
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/**
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* confirm that the value related to $key entry from the payload is in format userid@hostname
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* and compare hostname with the origin of the signed request.
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*
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* If request is not signed, we still verify that the hostname from the extracted value does,
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* actually, not support signed request
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*
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* @param IIncomingSignedRequest|null $signedRequest
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* @param string $key entry from data available in data
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* @param string $value value itself used in case request is not signed
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*
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* @throws IncomingRequestException
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*/
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private function confirmSignedOrigin(?IIncomingSignedRequest $signedRequest, string $key, string $value): void {
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if ($signedRequest === null) {
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$instance = $this->getHostFromFederationId($value);
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try {
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$this->signatureManager->getSignatory($instance);
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throw new IncomingRequestException('instance is supposed to sign its request');
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} catch (SignatoryNotFoundException) {
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return;
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}
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}
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$body = json_decode($signedRequest->getBody(), true) ?? [];
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$entry = trim($body[$key] ?? '', '@');
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if ($this->getHostFromFederationId($entry) !== $signedRequest->getOrigin()) {
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throw new IncomingRequestException('share initiation (' . $signedRequest->getOrigin() . ') from different instance (' . $entry . ') [key=' . $key . ']');
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}
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}
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/**
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* confirm identity of the remote instance on notification, based on the share token.
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*
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* If request is not signed, we still verify that the hostname from the extracted value does,
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* actually, not support signed request
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*
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* @param IIncomingSignedRequest|null $signedRequest
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* @param string $resourceType
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* @param string $sharedSecret
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*
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* @throws IncomingRequestException
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* @throws BadRequestException
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*/
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private function confirmNotificationIdentity(
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?IIncomingSignedRequest $signedRequest,
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string $resourceType,
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array $notification,
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): void {
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$sharedSecret = $notification['sharedSecret'] ?? '';
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if ($sharedSecret === '') {
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throw new BadRequestException(['sharedSecret']);
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}
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try {
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$provider = $this->cloudFederationProviderManager->getCloudFederationProvider($resourceType);
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if ($provider instanceof ISignedCloudFederationProvider) {
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$identity = $provider->getFederationIdFromSharedSecret($sharedSecret, $notification);
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} else {
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$this->logger->debug('cloud federation provider {provider} does not implements ISignedCloudFederationProvider', ['provider' => $provider::class]);
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return;
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}
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} catch (\Exception $e) {
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throw new IncomingRequestException($e->getMessage());
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}
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$this->confirmNotificationEntry($signedRequest, $identity);
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}
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/**
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* @param IIncomingSignedRequest|null $signedRequest
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* @param string $entry
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*
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* @return void
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* @throws IncomingRequestException
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*/
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private function confirmNotificationEntry(?IIncomingSignedRequest $signedRequest, string $entry): void {
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$instance = $this->getHostFromFederationId($entry);
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if ($signedRequest === null) {
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try {
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$this->signatureManager->getSignatory($instance);
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throw new IncomingRequestException('instance is supposed to sign its request');
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} catch (SignatoryNotFoundException) {
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return;
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}
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} elseif ($instance !== $signedRequest->getOrigin()) {
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throw new IncomingRequestException('remote instance ' . $instance . ' not linked to origin ' . $signedRequest->getOrigin());
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}
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}
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/**
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* @param string $entry
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* @return string
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* @throws IncomingRequestException
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*/
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private function getHostFromFederationId(string $entry): string {
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if (!str_contains($entry, '@')) {
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throw new IncomingRequestException('entry ' . $entry . ' does not contain @');
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}
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$rightPart = substr($entry, strrpos($entry, '@') + 1);
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// in case the full scheme is sent; getting rid of it
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$rightPart = $this->addressHandler->removeProtocolFromUrl($rightPart);
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try {
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return $this->signatureManager->extractIdentityFromUri('https://' . $rightPart);
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} catch (IdentityNotFoundException) {
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throw new IncomingRequestException('invalid host within federation id: ' . $entry);
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}
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}
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}
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