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<?php
/**
* @copyright Copyright (c) 2019 Matthias Held <matthias.held@uni-konstanz.de>
* @author Matthias Held <matthias.held@uni-konstanz.de>
* @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 <https://www.gnu.org/licenses/>.
*/
namespace OCA\RansomwareDetection\Service;
use OCA\RansomwareDetection\AppInfo\Application;
use OCA\RansomwareDetection\Model\Detection;
use OCA\RansomwareDetection\Model\DetectionDeserializer;
use OCA\RansomwareDetection\Classifier;
use OCA\RansomwareDetection\Analyzer\SequenceAnalyzer;
use OCP\IConfig;
use OCP\ILogger;
class DetectionService {
/** @var ILogger */
protected $logger;
/** @var FileOperationService */
protected $service;
/** @var DetectionDeserializer */
protected $deserializer;
/** @var IConfig */
protected $config;
/** @var Classifier */
protected $classifier;
/** @var string */
protected $userId;
/**
* @param ILogger $logger
* @param FileOperationService $service
* @param IConfig $config
* @param Classifier $classifier
* @param SequenceAnalyzer $sequenceAnalyzer
* @param string $userId
*/
public function __construct(
ILogger $logger,
FileOperationService $service,
DetectionDeserializer $deserializer,
IConfig $config,
Classifier $classifier,
SequenceAnalyzer $sequenceAnalyzer,
$userId
)
{
$this->logger = $logger;
$this->service = $service;
$this->deserializer = $deserializer;
$this->config = $config;
$this->classifier = $classifier;
$this->sequenceAnalyzer = $sequenceAnalyzer;
$this->userId = $userId;
}
public function getDetections() {
$files = $this->service->findAll();
$sequences = array();
$detectionObjects = array();
// Classify files and put together the sequences.
foreach ($files as $file) {
$this->classifier->classifyFile($file);
$sequences[$file->getSequence()][] = $file;
}
foreach ($sequences as $id => $sequence) {
if (sizeof($sequence) >= $this->config->getAppValue(Application::APP_ID, 'minimum_sequence_length', 0)) {
usort($sequence, function ($a, $b) {
return $b->getId() - $a->getId();
});
$result = $this->sequenceAnalyzer->analyze($id, $sequence);
$this->logger->debug('detection: suspicion score of sequence ' . $id . ' is ' . $result->getSuspicionScore() . '.', array('app' => Application::APP_ID));
if ($result->getSuspicionScore() >= 0.5) {
$detection = new Detection($id, $sequence);
array_push($detectionObjects, $detection);
}
}
}
usort($detectionObjects, function ($a, $b) {
return $b->getId() - $a->getId();
});
return $detectionObjects;
}
public function getDetection($id) {
return DetectionSerializer::deserialize(json_decode(new Detection(1, array())));
}
}
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