519 lines
15 KiB
PHP
519 lines
15 KiB
PHP
<?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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* 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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private static $tmpFileMapping; // Map tmp files to files in data/user/files
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/**
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* 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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* 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', 'logout', 'OCA\Encryption\Hooks', 'logout');
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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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* 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', 'rename', 'OCA\Encryption\Hooks', 'preRename');
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\OCP\Util::connectHook('OC_Filesystem', 'post_rename', 'OCA\Encryption\Hooks', 'postRenameOrCopy');
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\OCP\Util::connectHook('OC_Filesystem', 'copy', 'OCA\Encryption\Hooks', 'preCopy');
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\OCP\Util::connectHook('OC_Filesystem', 'post_copy', 'OCA\Encryption\Hooks', 'postRenameOrCopy');
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\OCP\Util::connectHook('OC_Filesystem', 'post_delete', 'OCA\Encryption\Hooks', 'postDelete');
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\OCP\Util::connectHook('OC_Filesystem', 'delete', 'OCA\Encryption\Hooks', 'preDelete');
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\OCP\Util::connectHook('OC_Filesystem', 'post_umount', 'OCA\Encryption\Hooks', 'postUmount');
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\OCP\Util::connectHook('OC_Filesystem', 'umount', 'OCA\Encryption\Hooks', 'preUmount');
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\OCP\Util::connectHook('\OC\Core\LostPassword\Controller\LostController', 'post_passwordReset', 'OCA\Encryption\Hooks', 'postPasswordReset');
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}
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/**
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* 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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\OCP\Util::connectHook('OC_App', 'post_disable', 'OCA\Encryption\Hooks', 'postEnable');
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}
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/**
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* 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 $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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* enable recovery
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*
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* @param string $recoveryKeyId
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* @param string $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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$appConfig = \OC::$server->getAppConfig();
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if ($recoveryKeyId === null) {
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$recoveryKeyId = 'recovery_' . substr(md5(time()), 0, 8);
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$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', $keypair['publicKey']);
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$cipher = \OCA\Encryption\Helper::getCipher();
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$encryptedKey = \OCA\Encryption\Crypt::symmetricEncryptFileContent($keypair['privateKey'], $recoveryPassword, $cipher);
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if ($encryptedKey) {
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Keymanager::setPrivateSystemKey($encryptedKey, $recoveryKeyId . '.private.key');
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// Set recoveryAdmin as enabled
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$appConfig->setValue('files_encryption', 'recoveryAdminEnabled', 1);
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$return = true;
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}
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\OC_FileProxy::$enabled = true;
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} else { // get recovery key and check the password
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$util = new \OCA\Encryption\Util(new \OC\Files\View('/'), \OCP\User::getUser());
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$return = $util->checkRecoveryPassword($recoveryPassword);
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if ($return) {
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$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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* Check if a path is a .part file
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* @param string $path Path that may identify a .part file
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* @return bool
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*/
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public static function isPartialFilePath($path) {
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$extension = pathinfo($path, PATHINFO_EXTENSION);
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if ( $extension === 'part') {
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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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* Remove .path extension from a file path
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* @param string $path Path that may identify a .part file
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* @return string File path without .part extension
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* @note this is needed for reusing keys
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*/
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public static function stripPartialFileExtension($path) {
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$extension = pathinfo($path, PATHINFO_EXTENSION);
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if ( $extension === 'part') {
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$newLength = strlen($path) - 5; // 5 = strlen(".part") = strlen(".etmp")
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$fPath = substr($path, 0, $newLength);
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// if path also contains a transaction id, we remove it too
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$extension = pathinfo($fPath, PATHINFO_EXTENSION);
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if(substr($extension, 0, 12) === 'ocTransferId') { // 12 = strlen("ocTransferId")
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$newLength = strlen($fPath) - strlen($extension) -1;
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$fPath = substr($fPath, 0, $newLength);
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}
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return $fPath;
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} else {
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return $path;
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}
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}
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/**
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* disable recovery
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*
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* @param string $recoveryPassword
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* @return bool
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*/
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public static function adminDisableRecovery($recoveryPassword) {
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$util = new Util(new \OC\Files\View('/'), \OCP\User::getUser());
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$return = $util->checkRecoveryPassword($recoveryPassword);
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if ($return) {
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// Set recoveryAdmin as disabled
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\OC::$server->getAppConfig()->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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* 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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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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* 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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* try to get the user from the path if no user is logged in
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* @param string $path
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* @return mixed user or false if we couldn't determine a user
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*/
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public static function getUser($path) {
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$user = \OCP\User::getUser();
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// if we are logged in, then we return the userid
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if ($user) {
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return $user;
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}
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// if no user is logged in we try to access a publicly shared files.
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// In this case we need to try to get the user from the path
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$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) < 2 || ($split[1] !== 'files' && $split[1] !== 'cache')) {
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return false;
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}
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$user = $split[0];
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if (\OCP\User::userExists($user)) {
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return $user;
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}
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return false;
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}
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/**
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* get path to the corresponding file in data/user/files if path points
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* to a version or to a file in cache
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* @param string $path path to a version or a file in the trash
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* @return string path to corresponding file relative to data/user/files
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*/
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public static function getPathToRealFile($path) {
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$trimmed = ltrim($path, '/');
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$split = explode('/', $trimmed);
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$result = false;
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if (count($split) >= 3 && ($split[1] === "files_versions" || $split[1] === 'cache')) {
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$sliced = array_slice($split, 2);
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$result = implode('/', $sliced);
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if ($split[1] === "files_versions") {
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// we skip user/files
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$sliced = array_slice($split, 2);
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$relPath = implode('/', $sliced);
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//remove the last .v
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$result = substr($relPath, 0, strrpos($relPath, '.v'));
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}
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if ($split[1] === "cache") {
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// we skip /user/cache/transactionId
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$sliced = array_slice($split, 3);
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$result = implode('/', $sliced);
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//prepare the folders
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self::mkdirr($path, new \OC\Files\View('/'));
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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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* create directory recursively
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* @param string $path
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* @param \OC\Files\View $view
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*/
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public static function mkdirr($path, \OC\Files\View $view) {
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$dirname = \OC\Files\Filesystem::normalizePath(dirname($path));
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$dirParts = explode('/', $dirname);
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$dir = "";
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foreach ($dirParts as $part) {
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$dir = $dir . '/' . $part;
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if (!$view->file_exists($dir)) {
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$view->mkdir($dir);
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}
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}
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}
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/**
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* redirect to a error page
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* @param Session $session
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* @param int|null $errorCode
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* @throws \Exception
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*/
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public static function redirectToErrorPage(Session $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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if(defined('PHPUNIT_RUN') and PHPUNIT_RUN) {
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throw new \Exception("Encryption error: $errorCode");
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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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* find all share keys for a given file
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*
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* @param string $filePath path to the file name relative to the user's files dir
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* for example "subdir/filename.txt"
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* @param string $shareKeyPath share key prefix path relative to the user's data dir
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* for example "user1/files_encryption/share-keys/subdir/filename.txt"
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* @param \OC\Files\View $rootView root view, relative to data/
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* @return array list of share key files, path relative to data/$user
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*/
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public static function findShareKeys($filePath, $shareKeyPath, \OC\Files\View $rootView) {
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$result = array();
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$user = \OCP\User::getUser();
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$util = new Util($rootView, $user);
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// get current sharing state
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$sharingEnabled = \OCP\Share::isEnabled();
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// get users sharing this file
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$usersSharing = $util->getSharingUsersArray($sharingEnabled, $filePath);
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$pathinfo = pathinfo($shareKeyPath);
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$baseDir = $pathinfo['dirname'] . '/';
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$fileName = $pathinfo['basename'];
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foreach ($usersSharing as $user) {
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$keyName = $fileName . '.' . $user . '.shareKey';
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if ($rootView->file_exists($baseDir . $keyName)) {
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$result[] = $baseDir . $keyName;
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} else {
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\OC_Log::write(
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'Encryption library',
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'No share key found for user "' . $user . '" for file "' . $fileName . '"',
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\OC_Log::WARN
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);
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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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* remember from which file the tmp file (getLocalFile() call) was created
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* @param string $tmpFile path of tmp file
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* @param string $originalFile path of the original file relative to data/
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*/
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public static function addTmpFileToMapper($tmpFile, $originalFile) {
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self::$tmpFileMapping[$tmpFile] = $originalFile;
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}
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/**
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* get the path of the original file
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* @param string $tmpFile path of the tmp file
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* @return string|false path of the original file or false
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*/
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public static function getPathFromTmpFile($tmpFile) {
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if (isset(self::$tmpFileMapping[$tmpFile])) {
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return self::$tmpFileMapping[$tmpFile];
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}
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return false;
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}
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/**
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* read the cipher used for encryption from the config.php
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*
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* @return string
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*/
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public static function getCipher() {
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$cipher = \OCP\Config::getSystemValue('cipher', Crypt::DEFAULT_CIPHER);
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if ($cipher !== 'AES-256-CFB' && $cipher !== 'AES-128-CFB') {
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\OCP\Util::writeLog('files_encryption',
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'wrong cipher defined in config.php, only AES-128-CFB and AES-256-CFB is supported. Fall back ' . Crypt::DEFAULT_CIPHER,
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\OCP\Util::WARN);
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$cipher = Crypt::DEFAULT_CIPHER;
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}
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return $cipher;
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}
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}
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