427 lines
9.6 KiB
PHP
427 lines
9.6 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Sam Tuke, Robin Appelman
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* @copyright 2012 Sam Tuke samtuke@owncloud.com, Robin Appelman
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* icewind1991@gmail.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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* @brief 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 $blackList = null; //mimetypes blacklisted from encryption
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private static $enableEncryption = null;
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/**
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* Check if a file requires encryption
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* @param string $path
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* @return bool
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*
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* Tests if server side encryption is enabled, and file is allowed by blacklists
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*/
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private static function shouldEncrypt($path) {
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if (is_null(self::$enableEncryption)) {
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if (
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\OCP\App::isEnabled('files_encryption') === true
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&& Crypt::mode() === 'server'
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) {
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self::$enableEncryption = true;
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} else {
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self::$enableEncryption = false;
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}
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}
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if (!self::$enableEncryption) {
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return false;
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}
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if (is_null(self::$blackList)) {
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self::$blackList = explode(',', \OCP\Config::getAppValue('files_encryption', 'type_blacklist', ''));
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}
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if (Crypt::isCatfileContent($path)) {
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return true;
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}
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$extension = substr($path, strrpos($path, '.') + 1);
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if (array_search($extension, self::$blackList) === false) {
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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 $path
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* @param $data
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* @return bool
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*/
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public function preFile_put_contents($path, &$data) {
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if (self::shouldEncrypt($path)) {
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if (!is_resource($data)) {
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// get root view
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$view = new \OC_FilesystemView('/');
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// get relative path
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$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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if (!isset($relativePath)) {
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return true;
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}
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$handle = fopen('crypt://' . $path . '.etmp', 'w');
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if (is_resource($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 = $view->file_get_contents($path . '.etmp');
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// remove our temp file
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$view->unlink($path . '.etmp');
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// re-enable proxy - our work is done
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\OC_FileProxy::$enabled = $proxyStatus;
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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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* @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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$view = new \OC_FilesystemView('/');
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// init session
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$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 $plainData;
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}
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/**
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* @brief When a file is deleted, remove its keyfile also
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*/
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public function preUnlink($path) {
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// let the trashbin handle this
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if (\OCP\App::isEnabled('files_trashbin')) {
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return true;
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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::$enabled = false;
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$view = new \OC_FilesystemView('/');
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$userId = \OCP\USER::getUser();
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$util = new Util($view, $userId);
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// get relative path
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$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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list($owner, $ownerPath) = $util->getUidAndFilename($relativePath);
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// Delete keyfile & shareKey so it isn't orphaned
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if (!Keymanager::deleteFileKey($view, $owner, $ownerPath)) {
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\OCP\Util::writeLog('Encryption library',
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'Keyfile or shareKey could not be deleted for file "' . $ownerPath . '"', \OCP\Util::ERROR);
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}
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Keymanager::delAllShareKeys($view, $owner, $ownerPath);
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\OC_FileProxy::$enabled = $proxyStatus;
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// If we don't return true then file delete will fail; better
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// to leave orphaned keyfiles than to disallow file deletion
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return true;
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}
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/**
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* @param $path
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* @return bool
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*/
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public function postTouch($path) {
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$this->handleFile($path);
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return true;
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}
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/**
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* @param $path
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* @param $result
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* @return resource
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*/
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public function postFopen($path, &$result) {
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$path = \OC\Files\Filesystem::normalizePath($path);
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if (!$result) {
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return $result;
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}
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// split the path parts
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$pathParts = explode('/', $path);
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// get relative path
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$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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// FIXME: handling for /userId/cache used by webdav for chunking. The cache chunks are NOT encrypted
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if (isset($pathParts[2]) && $pathParts[2] === 'cache') {
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return $result;
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}
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// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$meta = stream_get_meta_data($result);
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$view = new \OC_FilesystemView('');
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$util = new Util($view, \OCP\USER::getUser());
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// If file is already encrypted, decrypt using crypto protocol
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if (
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Crypt::mode() === 'server'
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&& $util->isEncryptedPath($path)
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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, $meta['mode']);
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} elseif (
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self::shouldEncrypt($path)
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and $meta ['mode'] !== 'r'
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and $meta['mode'] !== 'rb'
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) {
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$result = fopen('crypt://' . $path, $meta['mode']);
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}
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// Re-enable the proxy
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\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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/**
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* @param $path
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* @param $data
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* @return array
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*/
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public function postGetFileInfo($path, $data) {
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// if path is a folder do nothing
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if (\OCP\App::isEnabled('files_encryption') && is_array($data) && 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, $data['size']);
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// Re-enable the proxy
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\OC_FileProxy::$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 $path
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* @param $size
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* @return bool
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*/
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public function postFileSize($path, $size) {
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$view = new \OC_FilesystemView('/');
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// if path is a folder do nothing
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if ($view->is_dir($path)) {
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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 $size;
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}
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$fileInfo = false;
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// get file info from database/cache if not .part file
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if (!Keymanager::isPartialFilePath($path)) {
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$fileInfo = $view->getFileInfo($path);
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}
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// if file is encrypted return real file size
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if (is_array($fileInfo) && $fileInfo['encrypted'] === true) {
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$size = $fileInfo['unencrypted_size'];
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} else {
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// self healing if file was removed from file cache
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if (!is_array($fileInfo)) {
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$fileInfo = array();
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}
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$userId = \OCP\User::getUser();
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$util = new Util($view, $userId);
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$fixSize = $util->getFileSize($path);
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if ($fixSize > 0) {
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$size = $fixSize;
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$fileInfo['encrypted'] = true;
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$fileInfo['unencrypted_size'] = $size;
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// put file info if not .part file
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if (!Keymanager::isPartialFilePath($relativePath)) {
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$view->putFileInfo($path, $fileInfo);
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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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* @param $path
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*/
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public function handleFile($path) {
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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, $userId);
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// split the path parts
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$pathParts = explode('/', $path);
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// get relative path
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$relativePath = \OCA\Encryption\Helper::stripUserFilesPath($path);
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// only if file is on 'files' folder fix file size and sharing
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if (isset($pathParts[2]) && $pathParts[2] === 'files' && $util->fixFileSize($path)) {
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// get sharing app state
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$sharingEnabled = \OCP\Share::isEnabled();
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// get users
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$usersSharing = $util->getSharingUsersArray($sharingEnabled, $relativePath);
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// update sharing-keys
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$util->setSharedFileKeyfiles($session, $usersSharing, $relativePath);
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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}
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}
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