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<?php |
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/** |
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* Copyright (c) 2014 Viktar 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\Filesystem; |
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use OC\Files\Storage\Wrapper\Wrapper; |
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use OCA\Files_Antivirus\Scanner\AbstractScanner; |
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use OCA\Files_Antivirus\Scanner\InitException; |
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use \OCP\App; |
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use \OCP\IL10N; |
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use \OCP\ILogger; |
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use \OCP\Files\InvalidContentException; |
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use \OCP\Files\ForbiddenException; |
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use Icewind\Streams\CallbackWrapper; |
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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 = array('r+', 'w', 'w+', 'a', 'a+', 'x', 'x+', 'c', 'c+'); |
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/** |
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* @var AppConfig |
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*/ |
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protected $appConfig; |
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/** |
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* @var \OCA\Files_Antivirus\ScannerFactory |
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*/ |
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protected $scannerFactory; |
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/** |
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* @var IL10N |
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*/ |
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protected $l10n; |
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/** |
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* @var ILogger; |
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*/ |
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protected $logger; |
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/** @var RequestHelper */ |
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protected $requestHelper; |
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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->appConfig = $parameters['appConfig']; |
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$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->requestHelper = $parameters['requestHelper']; |
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} |
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/** |
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* @param string $path |
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* @param string $data |
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* @return bool |
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*/ |
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public function file_put_contents($path, $data) { |
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try { |
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$scanner = $this->scannerFactory->getScanner(); |
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$scanner->initScanner(); |
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$scanner->onAsyncData($data); |
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$this->onScanComplete($scanner, $path, false); |
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return parent::file_put_contents($path, $data); |
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} catch (InitException $e) { |
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$message = sprintf( |
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'Antivirus app is misconfigured or antivirus inaccessible. %s', |
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$e->getMessage() |
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); |
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$this->logger->warning($message, ['app' => 'files_antivirus']); |
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throw new ForbiddenException($message, false, $e); |
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} catch (\Exception $e){ |
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$message = implode(' ', [ __CLASS__, __METHOD__, $e->getMessage()]); |
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$this->logger->warning($message, ['app' => 'files_antivirus']); |
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} |
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return false; |
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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, $mode); |
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if ( |
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is_resource($stream) |
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&& $this->isWritingMode($mode) |
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&& $this->isScannableSize($path) |
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) { |
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try { |
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$scanner = $this->scannerFactory->getScanner(); |
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$scanner->initScanner(); |
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return CallBackWrapper::wrap( |
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$stream, |
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null, |
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function ($data) use ($scanner) { |
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$scanner->onAsyncData($data); |
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}, |
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function () use ($scanner, $path) { |
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$this->onScanComplete($scanner, $path, true); |
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} |
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); |
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} catch (InitException $e) { |
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$message = sprintf( |
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'Antivirus app is misconfigured or antivirus inaccessible. %s', |
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$e->getMessage() |
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); |
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$this->logger->warning($message, ['app' => 'files_antivirus']); |
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throw new ForbiddenException($message, false, $e); |
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} catch (\Exception $e){ |
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$message = implode(' ', [ __CLASS__, __METHOD__, $e->getMessage()]); |
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$this->logger->warning($message, ['app' => 'files_antivirus']); |
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} |
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} |
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return $stream; |
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} |
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/** |
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* @param AbstractScanner $scanner |
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* @param string $path |
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* @param bool $shouldDelete |
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* @throws InvalidContentException |
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*/ |
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private function onScanComplete($scanner, $path, $shouldDelete){ |
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$status = $scanner->completeAsyncScan(); |
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if (intval($status->getNumericStatus()) === \OCA\Files_Antivirus\Status::SCANRESULT_INFECTED) { |
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$owner = $this->getOwner($path); |
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$this->logger->warning( |
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'Infected file deleted. ' . $status->getDetails() |
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. ' Account: ' . $owner . ' Path: ' . $path, |
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['app' => 'files_antivirus'] |
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); |
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\OC::$server->getActivityManager()->publishActivity( |
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'files_antivirus', |
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Activity::SUBJECT_VIRUS_DETECTED, |
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[$path, $status->getDetails()], |
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Activity::MESSAGE_FILE_DELETED, |
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[], |
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$path, |
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'', |
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$owner, |
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Activity::TYPE_VIRUS_DETECTED, |
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Activity::PRIORITY_HIGH |
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); |
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if ($shouldDelete){ |
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//prevent from going to trashbin |
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if (App::isEnabled('files_trashbin')) { |
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\OCA\Files_Trashbin\Storage::preRenameHook([ |
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Filesystem::signal_param_oldpath => '', |
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Filesystem::signal_param_newpath => '' |
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]); |
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} |
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$this->unlink($path); |
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if (App::isEnabled('files_trashbin')) { |
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\OCA\Files_Trashbin\Storage::postRenameHook([]); |
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} |
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} |
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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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* 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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* Checks upload size against the av_max_file_size config option |
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* |
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* @param string $path |
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* @return bool |
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*/ |
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private function isScannableSize($path) { |
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$scanSizeLimit = intval($this->appConfig->getAvMaxFileSize()); |
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$size = $this->requestHelper->getUploadSize($path); |
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// No upload in progress. Skip this file. |
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if (is_null($size)){ |
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$this->logger->debug( |
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'No upload in progress or chunk is being uploaded. Scanning is skipped.', |
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['app' => 'files_antivirus'] |
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); |
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return false; |
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} |
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$matchesLimit = $scanSizeLimit === -1 || $scanSizeLimit >= $size; |
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$action = $matchesLimit ? 'Scanning is scheduled.' : 'Scanning is skipped.'; |
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$this->logger->debug( |
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'File size is {filesize}. av_max_file_size is {av_max_file_size}. {action}', |
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[ |
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'app' => 'files_antivirus', |
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'av_max_file_size' => $scanSizeLimit, |
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'filesize' => $size, |
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'action' => $action |
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] |
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); |
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return $matchesLimit; |
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} |
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} |
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owncloud /
files_antivirus
