568 lines
17 KiB
PHP
568 lines
17 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Sam Tuke
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* @copyright 2012 Sam Tuke samtuke@owncloud.org
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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\Encryption;
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use OC\Files\Filesystem;
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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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// TODO: use passphrase for encrypting private key that is separate to
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// the login password
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/**
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* @brief 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($params) {
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$l = new \OC_L10N('files_encryption');
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//check if all requirements are met
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if(!Helper::checkRequirements() ) {
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$error_msg = $l->t("Missing requirements.");
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$hint = $l->t('Please make sure that PHP 5.3.3 or newer is installed and that the OpenSSL 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, $hint);
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}
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$view = new \OC_FilesystemView('/');
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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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$util = new Util($view, $params['uid']);
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// setup user, if user not ready force relogin
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if (Helper::setupUser($util, $params['password']) === false) {
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return false;
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}
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$encryptedKey = Keymanager::getPrivateKey($view, $params['uid']);
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$privateKey = Crypt::decryptPrivateKey($encryptedKey, $params['password']);
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if ($privateKey === false) {
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\OCP\Util::writeLog('Encryption library', 'Private key for user "' . $params['uid']
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. '" is not valid! Maybe the user password was changed from outside if so please change it back to gain access', \OCP\Util::ERROR);
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}
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$session = new \OCA\Encryption\Session($view);
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$session->setPrivateKey($privateKey);
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// Check if first-run file migration has already been performed
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$ready = false;
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if ($util->getMigrationStatus() === Util::MIGRATION_OPEN) {
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$ready = $util->beginMigration();
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}
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// If migration not yet done
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if ($ready) {
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$userView = new \OC_FilesystemView('/' . $params['uid']);
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// Set legacy encryption key if it exists, to support
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// depreciated encryption system
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if (
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$userView->file_exists('encryption.key')
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&& $encLegacyKey = $userView->file_get_contents('encryption.key')
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) {
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$plainLegacyKey = Crypt::legacyDecrypt($encLegacyKey, $params['password']);
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$session->setLegacyKey($plainLegacyKey);
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}
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// Encrypt existing user files:
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// This serves to upgrade old versions of the encryption
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// app (see appinfo/spec.txt)
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if (
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$util->encryptAll('/' . $params['uid'] . '/' . 'files', $session->getLegacyKey(), $params['password'])
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) {
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\OC_Log::write(
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'Encryption library', 'Encryption of existing files belonging to "' . $params['uid'] . '" completed'
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, \OC_Log::INFO
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);
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}
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// Register successful migration in DB
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$util->finishMigration();
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}
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return true;
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}
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/**
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* @brief 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($params) {
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$view = new \OC_FilesystemView('/');
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$util = new Util($view, $params['uid']);
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Helper::setupUser($util, $params['password']);
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}
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/**
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* @brief cleanup encryption backend upon user deleted
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* @note This method should never be called for users using client side encryption
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*/
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public static function postDeleteUser($params) {
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$view = new \OC_FilesystemView('/');
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// cleanup public key
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$publicKey = '/public-keys/' . $params['uid'] . '.public.key';
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// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$view->unlink($publicKey);
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\OC_FileProxy::$enabled = $proxyStatus;
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}
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/**
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* @brief If the password can't be changed within ownCloud, than update the key password in advance.
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*/
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public static function preSetPassphrase($params) {
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if ( ! \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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* @brief 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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// 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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if ($params['uid'] === \OCP\User::getUser()) {
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$view = new \OC_FilesystemView('/');
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$session = new \OCA\Encryption\Session($view);
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// Get existing decrypted private key
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$privateKey = $session->getPrivateKey();
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// Encrypt private key with new user pwd as passphrase
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$encryptedPrivateKey = Crypt::symmetricEncryptFileContent($privateKey, $params['password']);
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// Save private key
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Keymanager::setPrivateKey($encryptedPrivateKey);
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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 = $params['uid'];
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$recoveryPassword = $params['recoveryPassword'];
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$newUserPassword = $params['password'];
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$view = new \OC_FilesystemView('/');
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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::$enabled = false;
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// Save public key
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$view->file_put_contents('/public-keys/' . $user . '.public.key', $keypair['publicKey']);
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// Encrypt private key empty passphrase
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$encryptedPrivateKey = Crypt::symmetricEncryptFileContent($keypair['privateKey'], $newUserPassword);
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// Save private key
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$view->file_put_contents(
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'/' . $user . '/files_encryption/' . $user . '.private.key', $encryptedPrivateKey);
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if ($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($recoveryPassword);
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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}
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}
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}
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/*
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* @brief check if files can be encrypted to every user.
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*/
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/**
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* @param $params
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*/
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public static function preShared($params) {
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$users = array();
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$view = new \OC\Files\View('/public-keys/');
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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($params['shareWith']);
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break;
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}
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$error = false;
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foreach ($users as $user) {
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if (!$view->file_exists($user . '.public.key')) {
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$error = true;
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break;
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}
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}
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if ($error) // Set flag var 'run' to notify emitting
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// script that hook execution failed
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{
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$params['run']->run = false;
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}
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// TODO: Make sure files_sharing provides user
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// feedback on failed share
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}
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/**
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* @brief
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*/
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public static function postShared($params) {
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// NOTE: $params has keys:
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// [itemType] => file
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// itemSource -> int, filecache file ID
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// [parent] =>
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// [itemTarget] => /13
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// shareWith -> string, uid of user being shared to
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// fileTarget -> path of file being shared
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// uidOwner -> owner of the original file being shared
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// [shareType] => 0
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// [shareWith] => test1
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// [uidOwner] => admin
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// [permissions] => 17
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// [fileSource] => 13
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// [fileTarget] => /test8
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// [id] => 10
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// [token] =>
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// [run] => whether emitting script should continue to run
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// TODO: Should other kinds of item be encrypted too?
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if ($params['itemType'] === 'file' || $params['itemType'] === 'folder') {
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$view = new \OC_FilesystemView('/');
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$session = new \OCA\Encryption\Session($view);
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$userId = \OCP\User::getUser();
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$util = new Util($view, $userId);
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$path = $util->fileIdToPath($params['itemSource']);
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$share = $util->getParentFromShare($params['id']);
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//if parent is set, then this is a re-share action
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if ($share['parent'] !== null) {
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// get the parent from current share
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$parent = $util->getShareParent($params['parent']);
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// if parent is file the it is an 1:1 share
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if ($parent['item_type'] === 'file') {
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// prefix path with Shared
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$path = '/Shared' . $parent['file_target'];
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} else {
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// NOTE: parent is folder but shared was a file!
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// we try to rebuild the missing path
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// some examples we face here
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// user1 share folder1 with user2 folder1 has
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// the following structure
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// /folder1/subfolder1/subsubfolder1/somefile.txt
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// user2 re-share subfolder2 with user3
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// user3 re-share somefile.txt user4
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// so our path should be
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// /Shared/subfolder1/subsubfolder1/somefile.txt
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// while user3 is sharing
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if ($params['itemType'] === 'file') {
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// get target path
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$targetPath = $util->fileIdToPath($params['fileSource']);
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$targetPathSplit = array_reverse(explode('/', $targetPath));
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// init values
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$path = '';
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$sharedPart = ltrim($parent['file_target'], '/');
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// rebuild path
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foreach ($targetPathSplit as $pathPart) {
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if ($pathPart !== $sharedPart) {
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$path = '/' . $pathPart . $path;
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} else {
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break;
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}
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}
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// prefix path with Shared
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$path = '/Shared' . $parent['file_target'] . $path;
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} else {
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// prefix path with Shared
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$path = '/Shared' . $parent['file_target'] . $params['fileTarget'];
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}
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}
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}
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$sharingEnabled = \OCP\Share::isEnabled();
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// get the path including mount point only if not a shared folder
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if (strncmp($path, '/Shared', strlen('/Shared') !== 0)) {
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// get path including the the storage mount point
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$path = $util->getPathWithMountPoint($params['itemSource']);
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}
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// if a folder was shared, get a list of all (sub-)folders
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if ($params['itemType'] === 'folder') {
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$allFiles = $util->getAllFiles($path);
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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, $path);
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}
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}
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}
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/**
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* @brief
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*/
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public static function postUnshare($params) {
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// NOTE: $params has keys:
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// [itemType] => file
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// [itemSource] => 13
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// [shareType] => 0
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// [shareWith] => test1
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// [itemParent] =>
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if ($params['itemType'] === 'file' || $params['itemType'] === 'folder') {
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$view = new \OC_FilesystemView('/');
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$userId = \OCP\User::getUser();
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$util = new Util($view, $userId);
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$path = $util->fileIdToPath($params['itemSource']);
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// check if this is a re-share
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if ($params['itemParent']) {
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// get the parent from current share
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$parent = $util->getShareParent($params['itemParent']);
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// get target path
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$targetPath = $util->fileIdToPath($params['itemSource']);
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$targetPathSplit = array_reverse(explode('/', $targetPath));
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// init values
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$path = '';
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$sharedPart = ltrim($parent['file_target'], '/');
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// rebuild path
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foreach ($targetPathSplit as $pathPart) {
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if ($pathPart !== $sharedPart) {
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$path = '/' . $pathPart . $path;
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} else {
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break;
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}
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}
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// prefix path with Shared
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$path = '/Shared' . $parent['file_target'] . $path;
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}
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// for group shares get a list of the group members
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if ($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 ($params['shareType'] === \OCP\Share::SHARE_TYPE_LINK) {
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$userIds = array($util->getPublicShareKeyId());
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} else {
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$userIds = array($params['shareWith']);
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}
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}
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// get the path including mount point only if not a shared folder
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if (strncmp($path, '/Shared', strlen('/Shared') !== 0)) {
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// get path including the the storage mount point
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$path = $util->getPathWithMountPoint($params['itemSource']);
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}
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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);
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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, $sharingUsers);
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// delete share key
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Keymanager::delShareKey($view, $delUsers, $path);
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}
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}
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}
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/**
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* @brief after a file is renamed, rename its keyfile and share-keys also fix the file size and fix also the sharing
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* @param array with oldpath and newpath
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*
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* This function is connected to the rename signal of OC_Filesystem and adjust the name and location
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* of the stored versions along the actual file
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*/
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public static function postRename($params) {
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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::$enabled = false;
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$view = new \OC_FilesystemView('/');
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$session = new \OCA\Encryption\Session($view);
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$userId = \OCP\User::getUser();
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$util = new Util($view, $userId);
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// Format paths to be relative to user files dir
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if ($util->isSystemWideMountPoint($params['oldpath'])) {
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$baseDir = 'files_encryption/';
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$oldKeyfilePath = $baseDir . 'keyfiles/' . $params['oldpath'];
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} else {
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$baseDir = $userId . '/' . 'files_encryption/';
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$oldKeyfilePath = $baseDir . 'keyfiles/' . $params['oldpath'];
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}
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if ($util->isSystemWideMountPoint($params['newpath'])) {
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$newKeyfilePath = $baseDir . 'keyfiles/' . $params['newpath'];
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} else {
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$newKeyfilePath = $baseDir . 'keyfiles/' . $params['newpath'];
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}
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// add key ext if this is not an folder
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if (!$view->is_dir($oldKeyfilePath)) {
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$oldKeyfilePath .= '.key';
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$newKeyfilePath .= '.key';
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// handle share-keys
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$localKeyPath = $view->getLocalFile($baseDir . 'share-keys/' . $params['oldpath']);
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$escapedPath = Helper::escapeGlobPattern($localKeyPath);
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$matches = glob($escapedPath . '*.shareKey');
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foreach ($matches as $src) {
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$dst = \OC\Files\Filesystem::normalizePath(str_replace($params['oldpath'], $params['newpath'], $src));
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// create destination folder if not exists
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if (!file_exists(dirname($dst))) {
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mkdir(dirname($dst), 0750, true);
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}
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rename($src, $dst);
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}
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} else {
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// handle share-keys folders
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$oldShareKeyfilePath = $baseDir . 'share-keys/' . $params['oldpath'];
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$newShareKeyfilePath = $baseDir . 'share-keys/' . $params['newpath'];
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// create destination folder if not exists
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if (!$view->file_exists(dirname($newShareKeyfilePath))) {
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$view->mkdir(dirname($newShareKeyfilePath), 0750, true);
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}
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$view->rename($oldShareKeyfilePath, $newShareKeyfilePath);
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}
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// Rename keyfile so it isn't orphaned
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if ($view->file_exists($oldKeyfilePath)) {
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// create destination folder if not exists
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if (!$view->file_exists(dirname($newKeyfilePath))) {
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$view->mkdir(dirname($newKeyfilePath), 0750, true);
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}
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$view->rename($oldKeyfilePath, $newKeyfilePath);
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}
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// build the path to the file
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$newPath = '/' . $userId . '/files' . $params['newpath'];
|
|
$newPathRelative = $params['newpath'];
|
|
|
|
if ($util->fixFileSize($newPath)) {
|
|
// get sharing app state
|
|
$sharingEnabled = \OCP\Share::isEnabled();
|
|
|
|
// get users
|
|
$usersSharing = $util->getSharingUsersArray($sharingEnabled, $newPathRelative);
|
|
|
|
// update sharing-keys
|
|
$util->setSharedFileKeyfiles($session, $usersSharing, $newPathRelative);
|
|
}
|
|
|
|
\OC_FileProxy::$enabled = $proxyStatus;
|
|
}
|
|
|
|
/**
|
|
* set migration status back to '0' so that all new files get encrypted
|
|
* if the app gets enabled again
|
|
* @param array $params contains the app ID
|
|
*/
|
|
public static function preDisable($params) {
|
|
if ($params['app'] === 'files_encryption') {
|
|
$query = \OC_DB::prepare('UPDATE `*PREFIX*encryption` SET `migration_status`=0');
|
|
$query->execute();
|
|
}
|
|
}
|
|
|
|
}
|