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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2023, Côme Chilliet <come.chilliet@nextcloud.com>
*
* @author Côme Chilliet <come.chilliet@nextcloud.com>
*
* @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 <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Encryption\Command;
use OC\Encryption\Exceptions\DecryptionFailedException;
use OC\Files\FileInfo;
use OC\Files\View;
use OCA\Encryption\KeyManager;
use OCP\Encryption\Exceptions\GenericEncryptionException;
use OCP\IUserManager;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
class DropLegacyFileKey extends Command {
private View $rootView;
public function __construct(
private IUserManager $userManager,
private KeyManager $keyManager,
) {
parent::__construct();
$this->rootView = new View();
}
protected function configure(): void {
$this
->setName('encryption:drop-legacy-filekey')
->setDescription('Scan the files for the legacy filekey format using RC4 and get rid of it (if master key is enabled)');
}
protected function execute(InputInterface $input, OutputInterface $output): int {
$result = true;
$output->writeln('<info>Scanning all files for legacy filekey</info>');
foreach ($this->userManager->getBackends() as $backend) {
$limit = 500;
$offset = 0;
do {
$users = $backend->getUsers('', $limit, $offset);
foreach ($users as $user) {
$output->writeln('Scanning all files for ' . $user);
$this->setupUserFS($user);
$result = $result && $this->scanFolder($output, '/' . $user);
}
$offset += $limit;
} while (count($users) >= $limit);
}
if ($result) {
$output->writeln('All scanned files are properly encrypted.');
return 0;
}
return 1;
}
private function scanFolder(OutputInterface $output, string $folder): bool {
$clean = true;
foreach ($this->rootView->getDirectoryContent($folder) as $item) {
$path = $folder . '/' . $item['name'];
if ($this->rootView->is_dir($path)) {
if ($this->scanFolder($output, $path) === false) {
$clean = false;
}
} else {
if (!$item->isEncrypted()) {
// ignore
continue;
}
$stats = $this->rootView->stat($path);
if (!isset($stats['hasHeader']) || $stats['hasHeader'] === false) {
$clean = false;
$output->writeln('<error>' . $path . ' does not have a proper header</error>');
} else {
try {
$legacyFileKey = $this->keyManager->getFileKey($path, null, true);
if ($legacyFileKey === '') {
$output->writeln('Got an empty legacy filekey for ' . $path . ', continuing', OutputInterface::VERBOSITY_VERBOSE);
continue;
}
} catch (GenericEncryptionException $e) {
$output->writeln('Got a decryption error for legacy filekey for ' . $path . ', continuing', OutputInterface::VERBOSITY_VERBOSE);
continue;
}
/* If that did not throw and filekey is not empty, a legacy filekey is used */
$clean = false;
$output->writeln($path . ' is using a legacy filekey, migrating');
$this->migrateSinglefile($path, $item, $output);
}
}
}
return $clean;
}
private function migrateSinglefile(string $path, FileInfo $fileInfo, OutputInterface $output): void {
$source = $path;
$target = $path . '.reencrypted.' . time();
try {
$this->rootView->copy($source, $target);
$copyResource = $this->rootView->fopen($target, 'r');
$sourceResource = $this->rootView->fopen($source, 'w');
if ($copyResource === false || $sourceResource === false) {
throw new DecryptionFailedException('Failed to open '.$source.' or '.$target);
}
if (stream_copy_to_stream($copyResource, $sourceResource) === false) {
$output->writeln('<error>Failed to copy '.$target.' data into '.$source.'</error>');
$output->writeln('<error>Leaving both files in there to avoid data loss</error>');
return;
}
$this->rootView->touch($source, $fileInfo->getMTime());
$this->rootView->unlink($target);
$output->writeln('<info>Migrated ' . $source . '</info>', OutputInterface::VERBOSITY_VERBOSE);
} catch (DecryptionFailedException $e) {
if ($this->rootView->file_exists($target)) {
$this->rootView->unlink($target);
}
$output->writeln('<error>Failed to migrate ' . $path . '</error>');
$output->writeln('<error>' . $e . '</error>', OutputInterface::VERBOSITY_VERBOSE);
}
}
/**
* setup user file system
*/
protected function setupUserFS(string $uid): void {
\OC_Util::tearDownFS();
\OC_Util::setupFS($uid);
}
}
|
