323 lines
8.9 KiB
PHP
Executable File
323 lines
8.9 KiB
PHP
Executable File
<?php
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/**
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* ownCloud
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*
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* @author Florin Peter
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* @copyright 2013 Florin Peter <owncloud@florin-peter.de>
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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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/**
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* @brief Class to manage registration of hooks an various helper methods
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* @package OCA\Encryption
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*/
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class Helper {
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/**
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* @brief register share related hooks
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*
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*/
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public static function registerShareHooks() {
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\OCP\Util::connectHook('OCP\Share', 'pre_shared', 'OCA\Encryption\Hooks', 'preShared');
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\OCP\Util::connectHook('OCP\Share', 'post_shared', 'OCA\Encryption\Hooks', 'postShared');
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\OCP\Util::connectHook('OCP\Share', 'post_unshare', 'OCA\Encryption\Hooks', 'postUnshare');
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}
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/**
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* @brief register user related hooks
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*
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*/
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public static function registerUserHooks() {
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\OCP\Util::connectHook('OC_User', 'post_login', 'OCA\Encryption\Hooks', 'login');
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\OCP\Util::connectHook('OC_User', 'post_setPassword', 'OCA\Encryption\Hooks', 'setPassphrase');
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\OCP\Util::connectHook('OC_User', 'pre_setPassword', 'OCA\Encryption\Hooks', 'preSetPassphrase');
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\OCP\Util::connectHook('OC_User', 'post_createUser', 'OCA\Encryption\Hooks', 'postCreateUser');
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\OCP\Util::connectHook('OC_User', 'post_deleteUser', 'OCA\Encryption\Hooks', 'postDeleteUser');
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}
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/**
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* @brief register filesystem related hooks
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*
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*/
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public static function registerFilesystemHooks() {
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\OCP\Util::connectHook('OC_Filesystem', 'post_rename', 'OCA\Encryption\Hooks', 'postRename');
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}
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/**
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* @brief register app management related hooks
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*
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*/
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public static function registerAppHooks() {
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\OCP\Util::connectHook('OC_App', 'pre_disable', 'OCA\Encryption\Hooks', 'preDisable');
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}
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/**
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* @brief setup user for files_encryption
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*
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* @param Util $util
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* @param string $password
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* @return bool
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*/
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public static function setupUser($util, $password) {
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// Check files_encryption infrastructure is ready for action
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if (!$util->ready()) {
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\OCP\Util::writeLog('Encryption library', 'User account "' . $util->getUserId()
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. '" is not ready for encryption; configuration started', \OCP\Util::DEBUG);
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if (!$util->setupServerSide($password)) {
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return false;
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}
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}
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return true;
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}
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/**
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* @brief enable recovery
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*
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* @param $recoveryKeyId
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* @param $recoveryPassword
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* @internal param \OCA\Encryption\Util $util
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* @internal param string $password
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* @return bool
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*/
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public static function adminEnableRecovery($recoveryKeyId, $recoveryPassword) {
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$view = new \OC\Files\View('/');
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if ($recoveryKeyId === null) {
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$recoveryKeyId = 'recovery_' . substr(md5(time()), 0, 8);
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\OC_Appconfig::setValue('files_encryption', 'recoveryKeyId', $recoveryKeyId);
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}
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if (!$view->is_dir('/owncloud_private_key')) {
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$view->mkdir('/owncloud_private_key');
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}
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if (
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(!$view->file_exists("/public-keys/" . $recoveryKeyId . ".public.key")
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|| !$view->file_exists("/owncloud_private_key/" . $recoveryKeyId . ".private.key"))
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) {
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$keypair = \OCA\Encryption\Crypt::createKeypair();
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\OC_FileProxy::$enabled = false;
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// Save public key
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if (!$view->is_dir('/public-keys')) {
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$view->mkdir('/public-keys');
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}
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$view->file_put_contents('/public-keys/' . $recoveryKeyId . '.public.key', $keypair['publicKey']);
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// Encrypt private key empty passphrase
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$encryptedPrivateKey = \OCA\Encryption\Crypt::symmetricEncryptFileContent($keypair['privateKey'], $recoveryPassword);
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// Save private key
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$view->file_put_contents('/owncloud_private_key/' . $recoveryKeyId . '.private.key', $encryptedPrivateKey);
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\OC_FileProxy::$enabled = true;
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// Set recoveryAdmin as enabled
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\OC_Appconfig::setValue('files_encryption', 'recoveryAdminEnabled', 1);
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$return = true;
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} else { // get recovery key and check the password
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$util = new \OCA\Encryption\Util(new \OC_FilesystemView('/'), \OCP\User::getUser());
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$return = $util->checkRecoveryPassword($recoveryPassword);
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if ($return) {
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\OC_Appconfig::setValue('files_encryption', 'recoveryAdminEnabled', 1);
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}
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}
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return $return;
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}
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/**
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* @brief disable recovery
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*
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* @param $recoveryPassword
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* @return bool
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*/
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public static function adminDisableRecovery($recoveryPassword) {
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$util = new Util(new \OC_FilesystemView('/'), \OCP\User::getUser());
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$return = $util->checkRecoveryPassword($recoveryPassword);
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if ($return) {
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// Set recoveryAdmin as disabled
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\OC_Appconfig::setValue('files_encryption', 'recoveryAdminEnabled', 0);
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}
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return $return;
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}
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/**
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* @brief checks if access is public/anonymous user
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* @return bool
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*/
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public static function isPublicAccess() {
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if (\OCP\USER::getUser() === false
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|| (isset($_GET['service']) && $_GET['service'] == 'files'
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&& isset($_GET['t']))
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) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* @brief Format a path to be relative to the /user/files/ directory
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* @param string $path the absolute path
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* @return string e.g. turns '/admin/files/test.txt' into 'test.txt'
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*/
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public static function stripUserFilesPath($path) {
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$trimmed = ltrim($path, '/');
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$split = explode('/', $trimmed);
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// it is not a file relative to data/user/files
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if (count($split) < 3 || $split[1] !== 'files') {
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return false;
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}
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$sliced = array_slice($split, 2);
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$relPath = implode('/', $sliced);
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return $relPath;
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}
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/**
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* @brief get path to the correspondig file in data/user/files
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* @param string $path path to a version or a file in the trash
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* @return string path to correspondig file relative to data/user/files
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*/
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public static function getPathToRealFile($path) {
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$trimmed = ltrim($path, '/');
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$split = explode('/', $trimmed);
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if (count($split) < 3 || $split[1] !== "files_versions") {
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return false;
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}
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$sliced = array_slice($split, 2);
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$realPath = implode('/', $sliced);
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//remove the last .v
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$realPath = substr($realPath, 0, strrpos($realPath, '.v'));
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return $realPath;
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}
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/**
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* @brief redirect to a error page
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*/
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public static function redirectToErrorPage($session, $errorCode = null) {
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if ($errorCode === null) {
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$init = $session->getInitialized();
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switch ($init) {
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case \OCA\Encryption\Session::INIT_EXECUTED:
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$errorCode = \OCA\Encryption\Crypt::ENCRYPTION_PRIVATE_KEY_NOT_VALID_ERROR;
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break;
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case \OCA\Encryption\Session::NOT_INITIALIZED:
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$errorCode = \OCA\Encryption\Crypt::ENCRYPTION_NOT_INITIALIZED_ERROR;
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break;
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default:
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$errorCode = \OCA\Encryption\Crypt::ENCRYPTION_UNKNOWN_ERROR;
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}
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}
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$location = \OC_Helper::linkToAbsolute('apps/files_encryption/files', 'error.php');
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$post = 0;
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if(count($_POST) > 0) {
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$post = 1;
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}
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header('Location: ' . $location . '?p=' . $post . '&errorCode=' . $errorCode);
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exit();
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}
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/**
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* check requirements for encryption app.
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* @return bool true if requirements are met
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*/
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public static function checkRequirements() {
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$result = true;
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//openssl extension needs to be loaded
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$result &= extension_loaded("openssl");
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// we need php >= 5.3.3
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$result &= version_compare(phpversion(), '5.3.3', '>=');
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return (bool) $result;
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}
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/**
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* check some common errors if the server isn't configured properly for encryption
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* @return bool true if configuration seems to be OK
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*/
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public static function checkConfiguration() {
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if(self::getOpenSSLPkey()) {
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return true;
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} else {
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while ($msg = openssl_error_string()) {
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\OCP\Util::writeLog('Encryption library', 'openssl_pkey_new() fails: ' . $msg, \OCP\Util::ERROR);
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}
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return false;
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}
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}
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/**
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* Create an openssl pkey with config-supplied settings
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* WARNING: This initializes a new private keypair, which is computationally expensive
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* @return resource The pkey resource created
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*/
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public static function getOpenSSLPkey() {
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return openssl_pkey_new(self::getOpenSSLConfig());
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}
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/**
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* Return an array of OpenSSL config options, default + config
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* Used for multiple OpenSSL functions
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* @return array The combined defaults and config settings
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*/
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public static function getOpenSSLConfig() {
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$config = array('private_key_bits' => 4096);
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$config = array_merge(\OCP\Config::getSystemValue('openssl', array()), $config);
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return $config;
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}
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/**
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* @brief glob uses different pattern than regular expressions, escape glob pattern only
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* @param unescaped path
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* @return escaped path
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*/
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public static function escapeGlobPattern($path) {
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return preg_replace('/(\*|\?|\[)/', '[$1]', $path);
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}
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}
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