nextcloud/apps/files_encryption/lib/migration.php

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<?php
/**
* ownCloud
*
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* @copyright (C) 2014 ownCloud, Inc.
*
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* @author Bjoern Schiessle <schiessle@owncloud.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Files_Encryption;
class Migration {
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/**
* @var \OC\Files\View
*/
private $view;
private $public_share_key_id;
private $recovery_key_id;
public function __construct() {
$this->view = new \OC\Files\View();
$this->public_share_key_id = \OCA\Encryption\Helper::getPublicShareKeyId();
$this->recovery_key_id = \OCA\Encryption\Helper::getRecoveryKeyId();
}
public function reorganizeFolderStructure() {
$this->createPathForKeys('/files_encryption');
// backup system wide folders
$this->backupSystemWideKeys();
// rename public keys
$this->renamePublicKeys();
// rename system wide mount point
$this->renameFileKeys('', '/files_encryption/keyfiles');
// rename system private keys
$this->renameSystemPrivateKeys();
// delete old system wide folders
$this->view->deleteAll('/public-keys');
$this->view->deleteAll('/owncloud_private_key');
$this->view->deleteAll('/files_encryption/share-keys');
$this->view->deleteAll('/files_encryption/keyfiles');
$users = \OCP\User::getUsers();
foreach ($users as $user) {
// backup all keys
if ($this->backupUserKeys($user)) {
// create new 'key' folder
$this->view->mkdir($user . '/files_encryption/keys');
// rename users private key
$this->renameUsersPrivateKey($user);
// rename file keys
$path = $user . '/files_encryption/keyfiles';
$this->renameFileKeys($user, $path);
$trashPath = $user . '/files_trashbin/keyfiles';
if (\OC_App::isEnabled('files_trashbin') && $this->view->is_dir($trashPath)) {
$this->renameFileKeys($user, $trashPath, true);
$this->view->deleteAll($trashPath);
$this->view->deleteAll($user . '/files_trashbin/share-keys');
}
// delete old folders
$this->deleteOldKeys($user);
}
}
}
private function backupSystemWideKeys() {
$backupDir = 'encryption_migration_backup_' . date("Y-m-d_H-i-s");
$this->view->mkdir($backupDir);
$this->view->copy('owncloud_private_key', $backupDir . '/owncloud_private_key');
$this->view->copy('public-keys', $backupDir . '/public-keys');
$this->view->copy('files_encryption', $backupDir . '/files_encryption');
}
private function backupUserKeys($user) {
$encryptionDir = $user . '/files_encryption';
if ($this->view->is_dir($encryptionDir)) {
$backupDir = $user . '/encryption_migration_backup_' . date("Y-m-d_H-i-s");
$this->view->mkdir($backupDir);
$this->view->copy($encryptionDir, $backupDir);
return true;
}
return false;
}
private function renamePublicKeys() {
$dh = $this->view->opendir('public-keys');
$this->createPathForKeys('files_encryption/public_keys');
if (is_resource($dh)) {
while (($oldPublicKey = readdir($dh)) !== false) {
if (!\OC\Files\Filesystem::isIgnoredDir($oldPublicKey)) {
$newPublicKey = substr($oldPublicKey, 0, strlen($oldPublicKey) - strlen('.public.key')) . '.publicKey';
$this->view->rename('public-keys/' . $oldPublicKey , 'files_encryption/public_keys/' . $newPublicKey);
}
}
closedir($dh);
}
}
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private function renameSystemPrivateKeys() {
$dh = $this->view->opendir('owncloud_private_key');
if (is_resource($dh)) {
while (($oldPrivateKey = readdir($dh)) !== false) {
if (!\OC\Files\Filesystem::isIgnoredDir($oldPrivateKey)) {
$newPrivateKey = substr($oldPrivateKey, 0, strlen($oldPrivateKey) - strlen('.private.key')) . '.privateKey';
$this->view->rename('owncloud_private_key/' . $oldPrivateKey , 'files_encryption/' . $newPrivateKey);
}
}
closedir($dh);
}
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}
private function renameUsersPrivateKey($user) {
$oldPrivateKey = $user . '/files_encryption/' . $user . '.private.key';
$newPrivateKey = substr($oldPrivateKey, 0, strlen($oldPrivateKey) - strlen('.private.key')) . '.privateKey';
$this->view->rename($oldPrivateKey, $newPrivateKey);
}
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private function getFileName($file, $trash) {
$extLength = strlen('.key');
if ($trash) {
$parts = explode('.', $file);
if ($parts[count($parts) - 1] !== 'key') {
$extLength = $extLength + strlen('.' . $parts[count($parts) - 1]);
}
}
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$filename = substr($file, 0, strlen($file) - $extLength);
return $filename;
}
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private function getExtension($file, $trash) {
$extension = '';
if ($trash) {
$parts = explode('.', $file);
if ($parts[count($parts) - 1] !== 'key') {
$extension = '.' . $parts[count($parts) - 1];
}
}
return $extension;
}
private function getFilePath($path, $user, $trash) {
$offset = $trash ? strlen($user . '/files_trashbin/keyfiles') : strlen($user . '/files_encryption/keyfiles');
return substr($path, $offset);
}
private function getTargetDir($user, $filePath, $filename, $extension, $trash) {
if ($trash) {
$targetDir = $user . '/files_trashbin/keys/' . $filePath . '/' . $filename . $extension;
} else {
$targetDir = $user . '/files_encryption/keys/' . $filePath . '/' . $filename . $extension;
}
return $targetDir;
}
private function renameFileKeys($user, $path, $trash = false) {
$dh = $this->view->opendir($path);
if (is_resource($dh)) {
while (($file = readdir($dh)) !== false) {
if (!\OC\Files\Filesystem::isIgnoredDir($file)) {
if ($this->view->is_dir($path . '/' . $file)) {
$this->renameFileKeys($user, $path . '/' . $file, $trash);
} else {
$filename = $this->getFileName($file, $trash);
$filePath = $this->getFilePath($path, $user, $trash);
$extension = $this->getExtension($file, $trash);
$targetDir = $this->getTargetDir($user, $filePath, $filename, $extension, $trash);
$this->createPathForKeys($targetDir);
$this->view->copy($path . '/' . $file, $targetDir . '/fileKey');
$this->renameShareKeys($user, $filePath, $filename, $targetDir, $trash);
}
}
}
closedir($dh);
}
}
private function getOldShareKeyPath($user, $filePath, $trash) {
if ($trash) {
$oldShareKeyPath = $user . '/files_trashbin/share-keys/' . $filePath;
} else {
$oldShareKeyPath = $user . '/files_encryption/share-keys/' . $filePath;
}
return $oldShareKeyPath;
}
private function getUidFromShareKey($file, $filename, $trash) {
$extLength = strlen('.shareKey');
if ($trash) {
$parts = explode('.', $file);
if ($parts[count($parts) - 1] !== 'shareKey') {
$extLength = $extLength + strlen('.' . $parts[count($parts) - 1]);
}
}
$uid = substr($file, strlen($filename) + 1, $extLength * -1);
return $uid;
}
private function renameShareKeys($user, $filePath, $filename, $target, $trash) {
$oldShareKeyPath = $this->getOldShareKeyPath($user, $filePath, $trash);
$dh = $this->view->opendir($oldShareKeyPath);
if (is_resource($dh)) {
while (($file = readdir($dh)) !== false) {
if (!\OC\Files\Filesystem::isIgnoredDir($file)) {
if ($this->view->is_dir($oldShareKeyPath . '/' . $file)) {
continue;
} else {
if (substr($file, 0, strlen($filename) +1) === $filename . '.') {
$uid = $this->getUidFromShareKey($file, $filename, $trash);
if ($uid === $this->public_share_key_id ||
$uid === $this->recovery_key_id ||
\OCP\User::userExists($uid)) {
$this->view->copy($oldShareKeyPath . '/' . $file, $target . '/' . $uid . '.shareKey');
}
}
}
}
}
closedir($dh);
}
}
private function deleteOldKeys($user) {
$this->view->deleteAll($user . '/files_encryption/keyfiles');
$this->view->deleteAll($user . '/files_encryption/share-keys');
}
private function createPathForKeys($path) {
if (!$this->view->file_exists($path)) {
$sub_dirs = explode('/', $path);
$dir = '';
foreach ($sub_dirs as $sub_dir) {
$dir .= '/' . $sub_dir;
if (!$this->view->is_dir($dir)) {
$this->view->mkdir($dir);
}
}
}
}
}