627 lines
19 KiB
PHP
627 lines
19 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @copyright (C) 2014 ownCloud, Inc.
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*
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* @author Sam Tuke <samtuke@owncloud.org>
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* @author Bjoern Schiessle <schiessle@owncloud.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library 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
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OCA\Files_Encryption;
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/**
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* Class for hook specific logic
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*/
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class Hooks {
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// file for which we want to rename the keys after the rename operation was successful
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private static $renamedFiles = array();
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// file for which we want to delete the keys after the delete operation was successful
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private static $deleteFiles = array();
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// file for which we want to delete the keys after the delete operation was successful
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private static $unmountedFiles = array();
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/**
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* Startup encryption backend upon user login
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* @note This method should never be called for users using client side encryption
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*/
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public static function login($params) {
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if (\OCP\App::isEnabled('files_encryption') === false) {
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return true;
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}
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$l = new \OC_L10N('files_encryption');
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$view = new \OC\Files\View('/');
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// ensure filesystem is loaded
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if (!\OC\Files\Filesystem::$loaded) {
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\OC_Util::setupFS($params['uid']);
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}
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$privateKey = Keymanager::getPrivateKey($view, $params['uid']);
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// if no private key exists, check server configuration
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if (!$privateKey) {
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//check if all requirements are met
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if (!Helper::checkRequirements() || !Helper::checkConfiguration()) {
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$error_msg = $l->t("Missing requirements.");
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$hint = $l->t('Please make sure that OpenSSL together with the PHP extension is enabled and configured properly. For now, the encryption app has been disabled.');
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\OC_App::disable('files_encryption');
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\OCP\Util::writeLog('Encryption library', $error_msg . ' ' . $hint, \OCP\Util::ERROR);
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\OCP\Template::printErrorPage($error_msg, $hint);
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}
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}
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$util = new Util($view, $params['uid']);
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// setup user, if user not ready force relogin
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if (Helper::setupUser($util, $params['password']) === false) {
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return false;
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}
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$session = $util->initEncryption($params);
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// Check if first-run file migration has already been performed
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$ready = false;
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$migrationStatus = $util->getMigrationStatus();
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if ($migrationStatus === Util::MIGRATION_OPEN && $session !== false) {
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$ready = $util->beginMigration();
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} elseif ($migrationStatus === Util::MIGRATION_IN_PROGRESS) {
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// refuse login as long as the initial encryption is running
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sleep(5);
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\OCP\User::logout();
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return false;
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}
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$result = true;
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// If migration not yet done
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if ($ready) {
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// Encrypt existing user files
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try {
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$result = $util->encryptAll('/' . $params['uid'] . '/' . 'files');
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} catch (\Exception $ex) {
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\OCP\Util::writeLog('Encryption library', 'Initial encryption failed! Error: ' . $ex->getMessage(), \OCP\Util::FATAL);
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$result = false;
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}
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if ($result) {
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\OC_Log::write(
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'Encryption library', 'Encryption of existing files belonging to "' . $params['uid'] . '" completed'
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, \OC_Log::INFO
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);
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// Register successful migration in DB
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$util->finishMigration();
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} else {
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\OCP\Util::writeLog('Encryption library', 'Initial encryption failed!', \OCP\Util::FATAL);
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$util->resetMigrationStatus();
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\OCP\User::logout();
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}
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}
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return $result;
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}
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/**
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* remove keys from session during logout
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*/
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public static function logout() {
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$session = new Session(new \OC\Files\View());
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$session->removeKeys();
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}
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/**
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* setup encryption backend upon user created
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* @note This method should never be called for users using client side encryption
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*/
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public static function postCreateUser($params) {
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if (\OCP\App::isEnabled('files_encryption')) {
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$view = new \OC\Files\View('/');
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$util = new Util($view, $params['uid']);
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Helper::setupUser($util, $params['password']);
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}
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}
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/**
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* cleanup encryption backend upon user deleted
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* @note This method should never be called for users using client side encryption
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*/
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public static function postDeleteUser($params) {
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if (\OCP\App::isEnabled('files_encryption')) {
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Keymanager::deletePublicKey(new \OC\Files\View(), $params['uid']);
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}
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}
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/**
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* If the password can't be changed within ownCloud, than update the key password in advance.
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*/
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public static function preSetPassphrase($params) {
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if (\OCP\App::isEnabled('files_encryption')) {
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if ( ! \OC_User::canUserChangePassword($params['uid']) ) {
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self::setPassphrase($params);
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}
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}
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}
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/**
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* Change a user's encryption passphrase
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* @param array $params keys: uid, password
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*/
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public static function setPassphrase($params) {
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if (\OCP\App::isEnabled('files_encryption') === false) {
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return true;
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}
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// Only attempt to change passphrase if server-side encryption
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// is in use (client-side encryption does not have access to
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// the necessary keys)
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if (Crypt::mode() === 'server') {
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$view = new \OC\Files\View('/');
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$session = new Session($view);
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// Get existing decrypted private key
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$privateKey = $session->getPrivateKey();
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if ($params['uid'] === \OCP\User::getUser() && $privateKey) {
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// Encrypt private key with new user pwd as passphrase
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$encryptedPrivateKey = Crypt::symmetricEncryptFileContent($privateKey, $params['password'], Helper::getCipher());
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// Save private key
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if ($encryptedPrivateKey) {
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Keymanager::setPrivateKey($encryptedPrivateKey, \OCP\User::getUser());
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} else {
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\OCP\Util::writeLog('files_encryption', 'Could not update users encryption password', \OCP\Util::ERROR);
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}
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// NOTE: Session does not need to be updated as the
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// private key has not changed, only the passphrase
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// used to decrypt it has changed
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} else { // admin changed the password for a different user, create new keys and reencrypt file keys
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$user = $params['uid'];
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$util = new Util($view, $user);
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$recoveryPassword = isset($params['recoveryPassword']) ? $params['recoveryPassword'] : null;
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// we generate new keys if...
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// ...we have a recovery password and the user enabled the recovery key
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// ...encryption was activated for the first time (no keys exists)
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// ...the user doesn't have any files
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if (($util->recoveryEnabledForUser() && $recoveryPassword)
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|| !$util->userKeysExists()
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|| !$view->file_exists($user . '/files')) {
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// backup old keys
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$util->backupAllKeys('recovery');
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$newUserPassword = $params['password'];
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// make sure that the users home is mounted
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\OC\Files\Filesystem::initMountPoints($user);
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$keypair = Crypt::createKeypair();
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// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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// Save public key
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Keymanager::setPublicKey($keypair['publicKey'], $user);
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// Encrypt private key with new password
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$encryptedKey = Crypt::symmetricEncryptFileContent($keypair['privateKey'], $newUserPassword, Helper::getCipher());
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if ($encryptedKey) {
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Keymanager::setPrivateKey($encryptedKey, $user);
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if ($recoveryPassword) { // if recovery key is set we can re-encrypt the key files
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$util = new Util($view, $user);
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$util->recoverUsersFiles($recoveryPassword);
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}
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} else {
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\OCP\Util::writeLog('files_encryption', 'Could not update users encryption password', \OCP\Util::ERROR);
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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}
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}
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}
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}
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/**
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* after password reset we create a new key pair for the user
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*
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* @param array $params
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*/
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public static function postPasswordReset($params) {
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$uid = $params['uid'];
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$password = $params['password'];
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$util = new Util(new \OC\Files\View(), $uid);
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$util->replaceUserKeys($password);
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}
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/*
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* check if files can be encrypted to every user.
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*/
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/**
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* @param array $params
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*/
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public static function preShared($params) {
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if (\OCP\App::isEnabled('files_encryption') === false) {
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return true;
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}
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$l = new \OC_L10N('files_encryption');
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$users = array();
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$view = new \OC\Files\View('/');
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switch ($params['shareType']) {
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case \OCP\Share::SHARE_TYPE_USER:
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$users[] = $params['shareWith'];
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break;
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case \OCP\Share::SHARE_TYPE_GROUP:
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$users = \OC_Group::usersInGroup($params['shareWith']);
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break;
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}
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$notConfigured = array();
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foreach ($users as $user) {
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if (!Keymanager::publicKeyExists($view, $user)) {
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$notConfigured[] = $user;
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}
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}
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if (count($notConfigured) > 0) {
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$params['run'] = false;
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$params['error'] = $l->t('Following users are not set up for encryption:') . ' ' . join(', ' , $notConfigured);
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}
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}
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/**
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* update share keys if a file was shared
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*/
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public static function postShared($params) {
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if (\OCP\App::isEnabled('files_encryption') === false) {
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return true;
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}
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if ($params['itemType'] === 'file' || $params['itemType'] === 'folder') {
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$path = \OC\Files\Filesystem::getPath($params['fileSource']);
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self::updateKeyfiles($path);
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}
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}
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/**
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* update keyfiles and share keys recursively
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*
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* @param string $path to the file/folder
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*/
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private static function updateKeyfiles($path) {
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$view = new \OC\Files\View('/');
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$userId = \OCP\User::getUser();
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$session = new Session($view);
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$util = new Util($view, $userId);
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$sharingEnabled = \OCP\Share::isEnabled();
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$mountManager = \OC\Files\Filesystem::getMountManager();
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$mount = $mountManager->find('/' . $userId . '/files' . $path);
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$mountPoint = $mount->getMountPoint();
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// if a folder was shared, get a list of all (sub-)folders
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if ($view->is_dir('/' . $userId . '/files' . $path)) {
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$allFiles = $util->getAllFiles($path, $mountPoint);
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} else {
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$allFiles = array($path);
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}
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foreach ($allFiles as $path) {
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$usersSharing = $util->getSharingUsersArray($sharingEnabled, $path);
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$util->setSharedFileKeyfiles($session, $usersSharing, $path);
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}
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}
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/**
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* unshare file/folder from a user with whom you shared the file before
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*/
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public static function postUnshare($params) {
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if (\OCP\App::isEnabled('files_encryption') === false) {
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return true;
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}
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if ($params['itemType'] === 'file' || $params['itemType'] === 'folder') {
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$view = new \OC\Files\View('/');
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$userId = $params['uidOwner'];
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$userView = new \OC\Files\View('/' . $userId . '/files');
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$util = new Util($view, $userId);
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$path = $userView->getPath($params['fileSource']);
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// for group shares get a list of the group members
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if ($params['shareType'] === \OCP\Share::SHARE_TYPE_GROUP) {
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$userIds = \OC_Group::usersInGroup($params['shareWith']);
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} else {
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if ($params['shareType'] === \OCP\Share::SHARE_TYPE_LINK || $params['shareType'] === \OCP\Share::SHARE_TYPE_REMOTE) {
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$userIds = array($util->getPublicShareKeyId());
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} else {
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$userIds = array($params['shareWith']);
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}
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}
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$mountManager = \OC\Files\Filesystem::getMountManager();
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$mount = $mountManager->find('/' . $userId . '/files' . $path);
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$mountPoint = $mount->getMountPoint();
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// if we unshare a folder we need a list of all (sub-)files
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if ($params['itemType'] === 'folder') {
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$allFiles = $util->getAllFiles($path, $mountPoint);
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} else {
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$allFiles = array($path);
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}
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foreach ($allFiles as $path) {
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// check if the user still has access to the file, otherwise delete share key
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$sharingUsers = $util->getSharingUsersArray(true, $path);
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// Unshare every user who no longer has access to the file
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$delUsers = array_diff($userIds, $sharingUsers);
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$keyPath = Keymanager::getKeyPath($view, $util, $path);
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// delete share key
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Keymanager::delShareKey($view, $delUsers, $keyPath, $userId, $path);
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}
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}
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}
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/**
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* mark file as renamed so that we know the original source after the file was renamed
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* @param array $params with the old path and the new path
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*/
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public static function preRename($params) {
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self::preRenameOrCopy($params, 'rename');
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}
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/**
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* mark file as copied so that we know the original source after the file was copied
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* @param array $params with the old path and the new path
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*/
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public static function preCopy($params) {
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self::preRenameOrCopy($params, 'copy');
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}
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private static function preRenameOrCopy($params, $operation) {
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$user = \OCP\User::getUser();
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$view = new \OC\Files\View('/');
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$util = new Util($view, $user);
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// we only need to rename the keys if the rename happens on the same mountpoint
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// otherwise we perform a stream copy, so we get a new set of keys
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$mp1 = $view->getMountPoint('/' . $user . '/files/' . $params['oldpath']);
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$mp2 = $view->getMountPoint('/' . $user . '/files/' . $params['newpath']);
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$oldKeysPath = Keymanager::getKeyPath($view, $util, $params['oldpath']);
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if ($mp1 === $mp2) {
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self::$renamedFiles[$params['oldpath']] = array(
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'operation' => $operation,
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'oldKeysPath' => $oldKeysPath,
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);
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} else {
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self::$renamedFiles[$params['oldpath']] = array(
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'operation' => 'cleanup',
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'oldKeysPath' => $oldKeysPath,
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);
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}
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}
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/**
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* after a file is renamed/copied, rename/copy its keyfile and share-keys also fix the file size and fix also the sharing
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*
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* @param array $params array with oldpath and newpath
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*/
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public static function postRenameOrCopy($params) {
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if (\OCP\App::isEnabled('files_encryption') === false) {
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return true;
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}
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$view = new \OC\Files\View('/');
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$userId = \OCP\User::getUser();
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$util = new Util($view, $userId);
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if (isset(self::$renamedFiles[$params['oldpath']]['operation']) &&
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isset(self::$renamedFiles[$params['oldpath']]['oldKeysPath'])) {
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$operation = self::$renamedFiles[$params['oldpath']]['operation'];
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$oldKeysPath = self::$renamedFiles[$params['oldpath']]['oldKeysPath'];
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unset(self::$renamedFiles[$params['oldpath']]);
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if ($operation === 'cleanup') {
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return $view->unlink($oldKeysPath);
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}
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} else {
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\OCP\Util::writeLog('Encryption library', "can't get path and owner from the file before it was renamed", \OCP\Util::DEBUG);
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return false;
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}
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list($ownerNew, $pathNew) = $util->getUidAndFilename($params['newpath']);
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if ($util->isSystemWideMountPoint($pathNew)) {
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$newKeysPath = 'files_encryption/keys/' . $pathNew;
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} else {
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$newKeysPath = $ownerNew . '/files_encryption/keys/' . $pathNew;
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}
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// create key folders if it doesn't exists
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if (!$view->file_exists(dirname($newKeysPath))) {
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$view->mkdir(dirname($newKeysPath));
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}
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$view->$operation($oldKeysPath, $newKeysPath);
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// update sharing-keys
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self::updateKeyfiles($params['newpath']);
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}
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/**
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* set migration status and the init status back to '0' so that all new files get encrypted
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* if the app gets enabled again
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* @param array $params contains the app ID
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*/
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public static function preDisable($params) {
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if ($params['app'] === 'files_encryption') {
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\OC::$server->getConfig()->deleteAppFromAllUsers('files_encryption');
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$session = new Session(new \OC\Files\View('/'));
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$session->setInitialized(Session::NOT_INITIALIZED);
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}
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}
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/**
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* set the init status to 'NOT_INITIALIZED' (0) if the app gets enabled
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* @param array $params contains the app ID
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*/
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public static function postEnable($params) {
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if ($params['app'] === 'files_encryption') {
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$session = new Session(new \OC\Files\View('/'));
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$session->setInitialized(Session::NOT_INITIALIZED);
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}
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}
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/**
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* if the file was really deleted we remove the encryption keys
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* @param array $params
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* @return boolean|null
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*/
|
|
public static function postDelete($params) {
|
|
|
|
$path = $params[\OC\Files\Filesystem::signal_param_path];
|
|
|
|
if (!isset(self::$deleteFiles[$path])) {
|
|
return true;
|
|
}
|
|
|
|
$deletedFile = self::$deleteFiles[$path];
|
|
$keyPath = $deletedFile['keyPath'];
|
|
|
|
// we don't need to remember the file any longer
|
|
unset(self::$deleteFiles[$path]);
|
|
|
|
$view = new \OC\Files\View('/');
|
|
|
|
// return if the file still exists and wasn't deleted correctly
|
|
if ($view->file_exists('/' . \OCP\User::getUser() . '/files/' . $path)) {
|
|
return true;
|
|
}
|
|
|
|
// Delete keyfile & shareKey so it isn't orphaned
|
|
$view->unlink($keyPath);
|
|
|
|
}
|
|
|
|
/**
|
|
* remember the file which should be deleted and it's owner
|
|
* @param array $params
|
|
* @return boolean|null
|
|
*/
|
|
public static function preDelete($params) {
|
|
$view = new \OC\Files\View('/');
|
|
$path = $params[\OC\Files\Filesystem::signal_param_path];
|
|
|
|
// skip this method if the trash bin is enabled or if we delete a file
|
|
// outside of /data/user/files
|
|
if (\OCP\App::isEnabled('files_trashbin')) {
|
|
return true;
|
|
}
|
|
|
|
$util = new Util($view, \OCP\USER::getUser());
|
|
|
|
$keysPath = Keymanager::getKeyPath($view, $util, $path);
|
|
|
|
self::$deleteFiles[$path] = array(
|
|
'keyPath' => $keysPath);
|
|
}
|
|
|
|
/**
|
|
* unmount file from yourself
|
|
* remember files/folders which get unmounted
|
|
*/
|
|
public static function preUnmount($params) {
|
|
$view = new \OC\Files\View('/');
|
|
$user = \OCP\User::getUser();
|
|
$path = $params[\OC\Files\Filesystem::signal_param_path];
|
|
|
|
$util = new Util($view, $user);
|
|
list($owner, $ownerPath) = $util->getUidAndFilename($path);
|
|
|
|
$keysPath = Keymanager::getKeyPath($view, $util, $path);
|
|
|
|
self::$unmountedFiles[$path] = array(
|
|
'keyPath' => $keysPath,
|
|
'owner' => $owner,
|
|
'ownerPath' => $ownerPath
|
|
);
|
|
}
|
|
|
|
/**
|
|
* unmount file from yourself
|
|
*/
|
|
public static function postUnmount($params) {
|
|
|
|
$path = $params[\OC\Files\Filesystem::signal_param_path];
|
|
$user = \OCP\User::getUser();
|
|
|
|
if (!isset(self::$unmountedFiles[$path])) {
|
|
return true;
|
|
}
|
|
|
|
$umountedFile = self::$unmountedFiles[$path];
|
|
$keyPath = $umountedFile['keyPath'];
|
|
$owner = $umountedFile['owner'];
|
|
$ownerPath = $umountedFile['ownerPath'];
|
|
|
|
$view = new \OC\Files\View();
|
|
|
|
// we don't need to remember the file any longer
|
|
unset(self::$unmountedFiles[$path]);
|
|
|
|
// check if the user still has access to the file, otherwise delete share key
|
|
$sharingUsers = \OCP\Share::getUsersSharingFile($path, $user);
|
|
if (!in_array($user, $sharingUsers['users'])) {
|
|
Keymanager::delShareKey($view, array($user), $keyPath, $owner, $ownerPath);
|
|
}
|
|
}
|
|
|
|
}
|