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<?php |
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/** |
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* Copyright (c) 2014 Victor Dubiniuk <[email protected]> |
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* This file is licensed under the Affero General Public License version 3 or |
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* later. |
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* See the COPYING-README file. |
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*/ |
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namespace OCA\Files_Antivirus; |
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use OC\Files\Storage\Wrapper\Wrapper; |
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use OCA\Files_Antivirus\Activity\Provider; |
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use OCA\Files_Antivirus\AppInfo\Application; |
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use OCA\Files_Antivirus\Event\ScanStateEvent; |
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use OCA\Files_Antivirus\Scanner\ScannerFactory; |
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use OCP\Activity\IManager as ActivityManager; |
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use OCP\App; |
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use OCP\Files\InvalidContentException; |
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use OCP\IL10N; |
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use OCP\ILogger; |
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use Symfony\Component\EventDispatcher\EventDispatcherInterface; |
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use OCA\Files_Trashbin\Trash\ITrashManager; |
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class AvirWrapper extends Wrapper { |
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/** |
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* Modes that are used for writing |
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* @var array |
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*/ |
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private $writingModes = ['r+', 'w', 'w+', 'a', 'a+', 'x', 'x+', 'c', 'c+']; |
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/** @var ScannerFactory */ |
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protected $scannerFactory; |
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/** @var IL10N */ |
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protected $l10n; |
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/** @var ILogger */ |
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protected $logger; |
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/** @var ActivityManager */ |
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protected $activityManager; |
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/** @var bool */ |
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protected $isHomeStorage; |
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/** @var bool */ |
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private $shouldScan = true; |
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/** |
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* @param array $parameters |
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*/ |
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public function __construct($parameters) { |
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parent::__construct($parameters); |
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$this->scannerFactory = $parameters['scannerFactory']; |
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$this->l10n = $parameters['l10n']; |
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$this->logger = $parameters['logger']; |
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$this->activityManager = $parameters['activityManager']; |
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$this->isHomeStorage = $parameters['isHomeStorage']; |
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/** @var EventDispatcherInterface $eventDispatcher */ |
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$eventDispatcher = $parameters['eventDispatcher']; |
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$eventDispatcher->addListener(ScanStateEvent::class, function(ScanStateEvent $event) { |
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$this->shouldScan = $event->getState(); |
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}); |
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} |
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/** |
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* Asynchronously scan data that are written to the file |
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* @param string $path |
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* @param string $mode |
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* @return resource | bool |
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*/ |
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public function fopen($path, $mode) { |
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$stream = $this->storage->fopen($path, $mode); |
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/* |
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* Only check when |
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* - it is a resource |
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* - it is a writing mode |
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* - if it is a homestorage it starts with files/ |
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* - if it is not a homestorage we always wrap (external storages) |
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*/ |
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if ($this->shouldScan && is_resource($stream) && $this->isWritingMode($mode) && (!$this->isHomeStorage || strpos($path, 'files/') === 0)) { |
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$stream = $this->wrapSteam($path, $stream); |
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} |
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return $stream; |
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} |
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public function writeStream(string $path, $stream, int $size = null): int { |
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if ($this->shouldScan && (!$this->isHomeStorage || strpos($path, 'files/') === 0)) { |
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$stream = $this->wrapSteam($path, $stream); |
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} |
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return parent::writeStream($path, $stream, $size); |
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} |
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private function wrapSteam(string $path, $stream) { |
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try { |
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$scanner = $this->scannerFactory->getScanner(); |
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$scanner->initScanner(); |
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return CallbackReadDataWrapper::wrap( |
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$stream, |
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function ($count, $data) use ($scanner) { |
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$scanner->onAsyncData($data); |
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}, |
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function ($data) use ($scanner) { |
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$scanner->onAsyncData($data); |
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}, |
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function () use ($scanner, $path) { |
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$status = $scanner->completeAsyncScan(); |
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if ((int)$status->getNumericStatus() === Status::SCANRESULT_INFECTED){ |
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//prevent from going to trashbin |
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if (App::isEnabled('files_trashbin')) { |
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/** @var ITrashManager $trashManager */ |
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$trashManager = \OC::$server->query(ITrashManager::class); |
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$trashManager->pauseTrash(); |
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} |
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$owner = $this->getOwner($path); |
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$this->unlink($path); |
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if (App::isEnabled('files_trashbin')) { |
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/** @var ITrashManager $trashManager */ |
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$trashManager = \OC::$server->query(ITrashManager::class); |
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$trashManager->resumeTrash(); |
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} |
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$this->logger->warning( |
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'Infected file deleted. ' . $status->getDetails() |
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. ' Account: ' . $owner . ' Path: ' . $path, |
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['app' => 'files_antivirus'] |
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); |
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$activity = $this->activityManager->generateEvent(); |
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$activity->setApp(Application::APP_NAME) |
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->setSubject(Provider::SUBJECT_VIRUS_DETECTED_UPLOAD, [$status->getDetails()]) |
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->setMessage(Provider::MESSAGE_FILE_DELETED) |
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->setObject('', 0, $path) |
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->setAffectedUser($owner) |
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->setType(Provider::TYPE_VIRUS_DETECTED); |
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$this->activityManager->publish($activity); |
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$this->logger->error('Infected file deleted. ' . $status->getDetails() . |
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' File: ' . $path . ' Account: ' . $owner, ['app' => 'files_antivirus']); |
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throw new InvalidContentException( |
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$this->l10n->t( |
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'Virus %s is detected in the file. Upload cannot be completed.', |
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$status->getDetails() |
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) |
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); |
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} |
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} |
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); |
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} catch (\Exception $e){ |
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$this->logger->logException($e); |
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} |
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return $stream; |
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} |
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/** |
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* Checks whether passed mode is suitable for writing |
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* @param string $mode |
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* @return bool |
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*/ |
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private function isWritingMode($mode){ |
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// Strip unessential binary/text flags |
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$cleanMode = str_replace( |
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['t', 'b'], |
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['', ''], |
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$mode |
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); |
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return in_array($cleanMode, $this->writingModes); |
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} |
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} |
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nextcloud /
files_antivirus
