401 lines
10 KiB
PHP
401 lines
10 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Bjoern Schiessle, Sam Tuke, Robin Appelman
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* @copyright 2012 Sam Tuke <samtuke@owncloud.com>
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* 2012 Robin Appelman <icewind1991@gmail.com>
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* 2014 Bjoern Schiessle <schiessle@owncloud.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Encryption proxy which handles filesystem operations before and after
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* execution and encrypts, and handles keyfiles accordingly. Used for
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* webui.
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*/
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namespace OCA\Encryption;
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/**
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* Class Proxy
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* @package OCA\Encryption
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*/
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class Proxy extends \OC_FileProxy {
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private static $unencryptedSizes = array(); // remember unencrypted size
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private static $fopenMode = array(); // remember the fopen mode
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private static $enableEncryption = false; // Enable encryption for the given path
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/**
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* check if path is excluded from encryption
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*
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* @param string $path relative to data/
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* @param string $uid user
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* @return boolean
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*/
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private function isExcludedPath($path, $uid) {
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$view = new \OC\Files\View();
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// files outside of the files-folder are excluded
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if(strpos($path, '/' . $uid . '/files') !== 0) {
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return true;
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}
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if (!$view->file_exists($path)) {
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$path = dirname($path);
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}
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// we don't encrypt server-to-server shares
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list($storage, ) = \OC\Files\Filesystem::resolvePath($path);
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/**
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* @var \OCP\Files\Storage $storage
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*/
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if ($storage->instanceOfStorage('OCA\Files_Sharing\External\Storage')) {
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return true;
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}
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return false;
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}
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/**
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* Check if a file requires encryption
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* @param string $path
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* @param string $mode type of access
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* @return bool
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*
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* Tests if server side encryption is enabled, and if we should call the
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* crypt stream wrapper for the given file
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*/
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private function shouldEncrypt($path, $mode = 'w') {
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$userId = Helper::getUser($path);
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$session = new Session(new \OC\Files\View());
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// don't call the crypt stream wrapper, if...
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if (
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$session->getInitialized() !== Session::INIT_SUCCESSFUL // encryption successful initialized
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|| Crypt::mode() !== 'server' // we are not in server-side-encryption mode
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|| $this->isExcludedPath($path, $userId) // if path is excluded from encryption
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|| substr($path, 0, 8) === 'crypt://' // we are already in crypt mode
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) {
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return false;
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}
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$view = new \OC\Files\View('');
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$util = new Util($view, $userId);
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// for write operation we always encrypt the files, for read operations
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// we check if the existing file is encrypted or not decide if it needs to
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// decrypt it.
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if (($mode !== 'r' && $mode !== 'rb') || $util->isEncryptedPath($path)) {
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return true;
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}
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return false;
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}
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/**
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* @param string $path
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* @param string $data
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* @return bool
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*/
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public function preFile_put_contents($path, &$data) {
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if ($this->shouldEncrypt($path)) {
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if (!is_resource($data)) {
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// get root view
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$view = new \OC\Files\View('/');
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// get relative path
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$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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if (!isset($relativePath)) {
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return true;
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}
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// create random cache folder
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$cacheFolder = rand();
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$path_slices = explode('/', \OC\Files\Filesystem::normalizePath($path));
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$path_slices[2] = "cache/".$cacheFolder;
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$tmpPath = implode('/', $path_slices);
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$handle = fopen('crypt://' . $tmpPath, 'w');
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if (is_resource($handle)) {
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// write data to stream
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fwrite($handle, $data);
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// close stream
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fclose($handle);
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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::$enabled = false;
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// get encrypted content
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$data = $view->file_get_contents($tmpPath);
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// store new unenecrypted size so that it can be updated
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// in the post proxy
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$tmpFileInfo = $view->getFileInfo($tmpPath);
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if ( isset($tmpFileInfo['size']) ) {
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self::$unencryptedSizes[\OC\Files\Filesystem::normalizePath($path)] = $tmpFileInfo['size'];
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}
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// remove our temp file
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$view->deleteAll('/' . \OCP\User::getUser() . '/cache/' . $cacheFolder);
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// re-enable proxy - our work is done
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\OC_FileProxy::$enabled = $proxyStatus;
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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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return true;
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}
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/**
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* update file cache with the new unencrypted size after file was written
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* @param string $path
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* @param mixed $result
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* @return mixed
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*/
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public function postFile_put_contents($path, $result) {
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$normalizedPath = \OC\Files\Filesystem::normalizePath($path);
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if ( isset(self::$unencryptedSizes[$normalizedPath]) ) {
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$view = new \OC\Files\View('/');
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$view->putFileInfo($normalizedPath,
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array('encrypted' => true, 'unencrypted_size' => self::$unencryptedSizes[$normalizedPath]));
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unset(self::$unencryptedSizes[$normalizedPath]);
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}
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return $result;
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}
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/**
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* @param string $path Path of file from which has been read
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* @param string $data Data that has been read from file
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*/
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public function postFile_get_contents($path, $data) {
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$plainData = null;
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$view = new \OC\Files\View('/');
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// init session
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$session = new \OCA\Encryption\Session($view);
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// If data is a catfile
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if (
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Crypt::mode() === 'server'
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&& Crypt::isCatfileContent($data)
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) {
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$handle = fopen('crypt://' . $path, 'r');
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if (is_resource($handle)) {
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while (($plainDataChunk = fgets($handle, 8192)) !== false) {
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$plainData .= $plainDataChunk;
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}
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}
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} elseif (
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Crypt::mode() == 'server'
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&& \OC::$session->exists('legacyenckey')
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&& Crypt::isEncryptedMeta($path)
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) {
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// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$plainData = Crypt::legacyBlockDecrypt($data, $session->getLegacyKey());
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\OC_FileProxy::$enabled = $proxyStatus;
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}
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if (!isset($plainData)) {
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$plainData = $data;
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}
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return $plainData;
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}
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/**
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* remember initial fopen mode because sometimes it gets changed during the request
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* @param string $path path
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* @param string $mode type of access
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*/
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public function preFopen($path, $mode) {
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self::$fopenMode[$path] = $mode;
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self::$enableEncryption = $this->shouldEncrypt($path, $mode);
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}
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/**
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* @param string $path
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* @param resource $result
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* @return resource
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*/
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public function postFopen($path, &$result) {
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$path = \OC\Files\Filesystem::normalizePath($path);
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if (!$result || self::$enableEncryption === false) {
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return $result;
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}
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// if we remember the mode from the pre proxy we re-use it
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// otherwise we fall back to stream_get_meta_data()
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if (isset(self::$fopenMode[$path])) {
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$mode = self::$fopenMode[$path];
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unset(self::$fopenMode[$path]);
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} else {
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$meta = stream_get_meta_data($result);
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$mode = $meta['mode'];
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}
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// Close the original encrypted file
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fclose($result);
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// Open the file using the crypto stream wrapper
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// protocol and let it do the decryption work instead
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$result = fopen('crypt://' . $path, $mode);
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return $result;
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}
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/**
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* @param string $path
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* @param array $data
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* @return array
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*/
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public function postGetFileInfo($path, $data) {
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// if path is a folder do nothing
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if (\OCP\App::isEnabled('files_encryption') && $data !== false && array_key_exists('size', $data)) {
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// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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// get file size
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$data['size'] = self::postFileSize($path, $data['size'], $data);
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// Re-enable the proxy
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\OC_FileProxy::$enabled = $proxyStatus;
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}
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return $data;
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}
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/**
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* @param string $path
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* @param int $size
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* @return int|bool
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*/
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public function postFileSize($path, $size, $fileInfo = null) {
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$view = new \OC\Files\View('/');
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$userId = Helper::getUser($path);
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$util = new Util($view, $userId);
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// if encryption is no longer enabled or if the files aren't migrated yet
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// we return the default file size
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if(!\OCP\App::isEnabled('files_encryption') ||
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$util->getMigrationStatus() !== Util::MIGRATION_COMPLETED) {
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return $size;
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}
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// if path is a folder do nothing
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if ($view->is_dir($path)) {
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$proxyState = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$fileInfo = $view->getFileInfo($path);
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\OC_FileProxy::$enabled = $proxyState;
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if (isset($fileInfo['unencrypted_size']) && $fileInfo['unencrypted_size'] > 0) {
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return $fileInfo['unencrypted_size'];
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}
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return $size;
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}
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// get relative path
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$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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// if path is empty we cannot resolve anything
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if (empty($relativePath)) {
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return $size;
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}
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// get file info from database/cache if not .part file
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if (empty($fileInfo) && !Helper::isPartialFilePath($path)) {
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$proxyState = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$fileInfo = $view->getFileInfo($path);
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\OC_FileProxy::$enabled = $proxyState;
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}
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// if file is encrypted return real file size
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if (isset($fileInfo['encrypted']) && $fileInfo['encrypted'] === true) {
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// try to fix unencrypted file size if it doesn't look plausible
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if ((int)$fileInfo['size'] > 0 && (int)$fileInfo['unencrypted_size'] === 0 ) {
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$fixSize = $util->getFileSize($path);
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$fileInfo['unencrypted_size'] = $fixSize;
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// put file info if not .part file
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if (!Helper::isPartialFilePath($relativePath)) {
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$view->putFileInfo($path, array('unencrypted_size' => $fixSize));
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}
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}
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$size = $fileInfo['unencrypted_size'];
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} else {
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$fileInfoUpdates = array();
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$fixSize = $util->getFileSize($path);
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if ($fixSize > 0) {
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$size = $fixSize;
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$fileInfoUpdates['encrypted'] = true;
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$fileInfoUpdates['unencrypted_size'] = $size;
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// put file info if not .part file
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if (!Helper::isPartialFilePath($relativePath)) {
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$view->putFileInfo($path, $fileInfoUpdates);
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}
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}
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}
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return $size;
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}
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}
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