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<?php |
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/** |
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* @copyright Copyright (c) 2018 Matthias Held <[email protected]> |
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* @author Matthias Held <[email protected]> |
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* @license GNU AGPL version 3 or any later version |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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namespace OCA\RansomwareDetection\Connector\Sabre; |
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use OCA\RansomwareDetection\Classifier; |
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use OCA\RansomwareDetection\AppInfo\Application; |
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use OCA\RansomwareDetection\Analyzer\SequenceAnalyzer; |
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use OCA\RansomwareDetection\Service\FileOperationService; |
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use OCP\Notification\IManager; |
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use OCP\IUserSession; |
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use OCP\ISession; |
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use OCP\ILogger; |
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use OCP\IConfig; |
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use Sabre\DAV\Server; |
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use Sabre\DAV\ServerPlugin; |
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use Sabre\HTTP\RequestInterface; |
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use Sabre\HTTP\ResponseInterface; |
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class RequestPlugin extends ServerPlugin |
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{ |
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/** @var Server */ |
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protected $server; |
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/** @var ILogger */ |
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protected $logger; |
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/** @var IConfig */ |
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protected $config; |
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/** @var IUserSession */ |
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protected $userSession; |
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/** @var ISession */ |
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protected $session; |
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/** @var FileOperationService */ |
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protected $service; |
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/** @var IManager */ |
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protected $notifications; |
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/** @var Classifier */ |
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protected $classifier; |
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/** @var SequenceAnalyzer */ |
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protected $sequenceAnalyzer; |
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const PROPFIND_COUNT = 6; |
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/** |
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* @param ILogger $logger |
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* @param IConfig $config |
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* @param IUserSession $userSession |
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* @param ISession $session |
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* @param FileOperationService $service |
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* @param IManager $notifications |
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* @param Classifier $classifer |
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* @param SequenceAnalyzer $sequenceAnalyzer |
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*/ |
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public function __construct( |
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ILogger $logger, |
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IConfig $config, |
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IUserSession $userSession, |
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ISession $session, |
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FileOperationService $service, |
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IManager $notifications, |
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Classifier $classifier, |
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SequenceAnalyzer $sequenceAnalyzer |
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) { |
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$this->logger = $logger; |
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$this->config = $config; |
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$this->userSession = $userSession; |
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$this->session = $session; |
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$this->service = $service; |
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$this->notifications = $notifications; |
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$this->classifier = $classifier; |
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$this->sequenceAnalyzer = $sequenceAnalyzer; |
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} |
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public function initialize(Server $server) |
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{ |
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$this->server = $server; |
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$server->on('method:PROPFIND', [$this, 'beforeHttpPropFind'], 100); |
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$server->on('method:PUT', [$this, 'beforeHttpPut'], 100); |
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$server->on('method:DELETE', [$this, 'beforeHttpDelete'], 100); |
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$server->on('method:GET', [$this, 'beforeHttpGet'], 100); |
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$server->on('method:POST', [$this, 'beforeHttpPost'], 100); |
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} |
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public function beforeHttpPropFind(RequestInterface $request, ResponseInterface $response) |
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{ |
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if ($this->userSession !== null && $this->userSession->getUser() !== null) { |
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// only process the propfind request if there is a active user session |
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$propfindCount = $this->config->getUserValue($this->userSession->getUser()->getUID(), Application::APP_ID, 'propfind_count:'.$this->session->getId(), 0); |
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if ($propfindCount + 1 < self::PROPFIND_COUNT) { |
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// less than PROPFIND_COUNT + 1 PROPFIND requests |
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$this->config->setUserValue($this->userSession->getUser()->getUID(), Application::APP_ID, 'propfind_count:'.$this->session->getId(), $propfindCount + 1); |
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} else { |
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// more than PROPFIND_COUNT PROPFIND requests and no file is uploading |
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$sequenceId = $this->config->getUserValue($this->userSession->getUser()->getUID(), Application::APP_ID, 'sequence_id', 0); |
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$sequence = $this->service->findSequenceById([$sequenceId]); |
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if (sizeof($sequence) > 0) { |
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// get old sequence id |
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// start a new sequence by increasing the sequence id |
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$this->config->setUserValue($this->userSession->getUser()->getUID(), Application::APP_ID, 'sequence_id', $sequenceId + 1); |
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$this->config->setUserValue($this->userSession->getUser()->getUID(), Application::APP_ID, 'propfind_count:'.$this->session->getId(), 0); |
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$this->classifySequence($sequence); |
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} |
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} |
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} |
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} |
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public function beforeHttpPut(RequestInterface $request, ResponseInterface $response) |
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{ |
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// extend if necessary |
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} |
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public function beforeHttpDelete(RequestInterface $request, ResponseInterface $response) |
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{ |
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// extend if necessary |
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} |
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public function beforeHttpGet(RequestInterface $request, ResponseInterface $response) |
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{ |
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// extend if necessary |
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} |
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public function beforeHttpPost(RequestInterface $request, ResponseInterface $response) |
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{ |
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// extend if necessary |
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} |
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/** |
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* Triggers a notification. |
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*/ |
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private function triggerNotification($notification) |
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{ |
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$notification->setApp(Application::APP_ID); |
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$notification->setDateTime(new \DateTime()); |
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$notification->setObject('ransomware', 'ransomware'); |
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$notification->setSubject('ransomware_attack_detected', []); |
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$notification->setUser($this->userSession->getUser()->getUID()); |
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$this->notifications->notify($notification); |
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} |
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/** |
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* Classify sequence and if suspicion level is reached |
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* trigger a notification. |
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* |
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* @param array $sequence |
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*/ |
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private function classifySequence($sequence) |
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{ |
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$sequenceSuspicionLevel = $this->config->getAppValue(Application::APP_ID, 'suspicion_level', 2); |
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foreach ($sequence as $file) { |
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$this->classifier->classifyFile($file); |
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} |
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// sequence suspicion level |
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if ($sequenceSuspicionLevel === 1) { |
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$level = 2; |
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} else { |
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$level = 4; |
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} |
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// sequence id is irrelevant so we use 0 |
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$sequenceResult = $this->sequenceAnalyzer->analyze(0, $sequence); |
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if ($sequenceResult->getSuspicionScore() >= $level) { |
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$this->triggerNotification($this->notifications->createNotification()); |
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} |
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} |
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} |
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undo-ransomware /
ransomware_detection
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The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g.
excluded_paths: ["lib/*"], you can move it to the dependency path list as follows:For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths