2011-10-21 19:02:11 +04:00
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<?php
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/**
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* ownCloud
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*
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2012-07-25 21:28:56 +04:00
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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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2011-10-21 19:02:11 +04:00
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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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2013-01-30 22:52:02 +04:00
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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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2012-10-17 19:35:19 +04:00
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namespace OCA\Encryption;
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2012-07-25 21:28:56 +04:00
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class Proxy extends \OC_FileProxy {
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2012-07-25 19:25:24 +04:00
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private static $blackList = null; //mimetypes blacklisted from encryption
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private static $enableEncryption = null;
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2011-11-24 04:44:54 +04:00
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/**
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2012-07-11 20:51:27 +04:00
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* Check if a file requires encryption
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2011-11-24 04:44:54 +04:00
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* @param string $path
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* @return bool
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2012-07-11 20:51:27 +04:00
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*
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2012-08-10 14:27:09 +04:00
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* Tests if server side encryption is enabled, and file is allowed by blacklists
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2011-11-24 04:44:54 +04:00
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*/
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2012-07-11 20:51:27 +04:00
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private static function shouldEncrypt( $path ) {
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2012-10-17 19:35:19 +04:00
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2012-07-11 20:51:27 +04:00
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if ( is_null( self::$enableEncryption ) ) {
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2012-11-16 22:31:37 +04:00
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if (
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2013-01-24 22:37:34 +04:00
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\OCP\Config::getAppValue( 'files_encryption', 'enable_encryption', 'true' ) == 'true'
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&& Crypt::mode() == 'server'
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2012-11-16 22:31:37 +04:00
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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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2012-07-11 20:51:27 +04:00
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2012-04-18 18:02:35 +04:00
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}
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2012-07-11 20:51:27 +04:00
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2012-11-16 22:31:37 +04:00
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if ( !self::$enableEncryption ) {
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2012-07-11 20:51:27 +04:00
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2012-04-18 18:02:35 +04:00
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return false;
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2012-07-11 20:51:27 +04:00
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2012-04-18 18:02:35 +04:00
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}
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2012-07-11 20:51:27 +04:00
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2012-11-16 22:31:37 +04:00
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if ( is_null(self::$blackList ) ) {
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2012-07-11 20:51:27 +04:00
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2013-02-22 19:08:08 +04:00
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self::$blackList = explode(',', \OCP\Config::getAppValue( 'files_encryption', 'type_blacklist', '' ) );
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2012-07-11 20:51:27 +04:00
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2011-11-24 04:44:54 +04:00
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}
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2012-07-11 20:51:27 +04:00
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2013-01-23 23:24:26 +04:00
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if ( Crypt::isCatfile( $path ) ) {
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2012-07-11 20:51:27 +04:00
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2011-11-24 04:44:54 +04:00
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return true;
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2012-07-11 20:51:27 +04:00
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2011-11-24 04:44:54 +04:00
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}
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2012-07-11 20:51:27 +04:00
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2013-01-24 22:37:34 +04:00
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$extension = substr( $path, strrpos( $path, '.' ) +1 );
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2012-07-11 20:51:27 +04:00
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2013-01-24 22:37:34 +04:00
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if ( array_search( $extension, self::$blackList ) === false ) {
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2012-07-11 20:51:27 +04:00
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2011-11-24 04:44:54 +04:00
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return true;
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2012-07-11 20:51:27 +04:00
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2011-11-24 04:44:54 +04:00
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}
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2012-07-11 20:51:27 +04:00
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return false;
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2011-11-24 04:44:54 +04:00
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}
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2012-07-11 20:51:27 +04:00
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public function preFile_put_contents( $path, &$data ) {
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2013-02-11 15:12:21 +04:00
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// TODO check for existing key file and reuse it if possible to avoid problems with versioning etc.
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2012-07-11 20:51:27 +04:00
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if ( self::shouldEncrypt( $path ) ) {
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2013-02-09 22:39:32 +04:00
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// Stream put contents should have been converted to fopen
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if ( !is_resource( $data ) ) {
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2012-07-11 20:51:27 +04:00
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2013-02-11 15:12:21 +04:00
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// TODO check who is the owner of the file in case of shared folders
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2013-01-05 21:12:23 +04:00
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$userId = \OCP\USER::getUser();
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$rootView = new \OC_FilesystemView( '/' );
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2013-02-11 14:21:23 +04:00
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$util = new Util( $rootView, $userId );
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$filePath = $util->stripUserFilesPath( $path );
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2012-07-25 21:28:56 +04:00
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// Set the filesize for userland, before encrypting
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2012-07-11 20:51:27 +04:00
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$size = strlen( $data );
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2012-08-14 22:06:56 +04:00
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// Disable encryption proxy to prevent recursive calls
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\OC_FileProxy::$enabled = false;
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2013-02-11 14:21:23 +04:00
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// Encrypt data
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$encData = Crypt::symmetricEncryptFileContentKeyfile( $data );
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2013-01-14 23:07:28 +04:00
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2013-02-09 22:39:32 +04:00
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// Check if the keyfile needs to be shared
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2013-02-22 19:02:27 +04:00
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if ( ($userIds = \OCP\Share::getUsersSharingFile( $filePath, true )) ) {
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2013-02-11 14:21:23 +04:00
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// $fileOwner = \OC\Files\Filesystem::getOwner( $path );
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$publicKeys = Keymanager::getPublicKeys( $rootView, $userIds );
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\OC_FileProxy::$enabled = false;
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// Encrypt plain keyfile to multiple sharefiles
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$multiEncrypted = Crypt::multiKeyEncrypt( $encData['key'], $publicKeys );
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// Save sharekeys to user folders
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Keymanager::setShareKeys( $rootView, $filePath, $multiEncrypted['keys'] );
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// Set encrypted keyfile as common varname
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$encKey = $multiEncrypted['encrypted'];
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2013-02-09 22:39:32 +04:00
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} else {
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$publicKey = Keymanager::getPublicKey( $rootView, $userId );
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// Encrypt plain data to a single user
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2013-02-11 14:21:23 +04:00
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$encKey = Crypt::keyEncrypt( $encData['key'], $publicKey );
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2013-02-09 22:39:32 +04:00
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}
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2012-07-25 21:28:56 +04:00
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2013-02-11 14:21:23 +04:00
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// TODO: Replace userID with ownerId so keyfile is saved centrally
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2012-08-01 17:11:41 +04:00
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2012-07-31 22:28:11 +04:00
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// Save keyfile for newly encrypted file in parallel directory tree
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2013-02-11 14:21:23 +04:00
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Keymanager::setFileKey( $rootView, $filePath, $userId, $encKey );
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// Replace plain content with encrypted content by reference
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$data = $encData['encrypted'];
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2012-07-25 21:28:56 +04:00
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// Update the file cache with file info
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2013-01-31 20:49:07 +04:00
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\OC\Files\Filesystem::putFileInfo( $path, array( 'encrypted'=>true, 'size' => $size ), '' );
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2012-07-11 20:51:27 +04:00
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2012-10-17 19:35:19 +04:00
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// Re-enable proxy - our work is done
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2012-08-14 22:06:56 +04:00
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\OC_FileProxy::$enabled = true;
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2011-10-21 19:02:11 +04:00
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}
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}
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2012-11-16 22:31:37 +04:00
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2011-10-21 19:02:11 +04:00
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}
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2012-12-11 19:10:56 +04:00
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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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2012-07-25 19:25:24 +04:00
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public function postFile_get_contents( $path, $data ) {
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2013-02-20 23:18:00 +04:00
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// FIXME: $path for shared files is just /uid/files/Shared/filepath
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$userId = \OCP\USER::getUser();
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$view = new \OC_FilesystemView( '/' );
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$util = new Util( $view, $userId );
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if ( $util->isSharedPath( $path ) ) {
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$relPath = $util->stripSharedFilePath( $path );
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} else {
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$relPath = $util->stripUserFilesPath( $path );
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}
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2013-02-11 15:12:21 +04:00
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// TODO check for existing key file and reuse it if possible to avoid problems with versioning etc.
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2012-11-28 22:39:19 +04:00
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// Disable encryption proxy to prevent recursive calls
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\OC_FileProxy::$enabled = false;
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2012-12-11 19:10:56 +04:00
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// If data is a catfile
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2012-11-28 22:39:19 +04:00
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if (
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2013-01-24 22:37:34 +04:00
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Crypt::mode() == 'server'
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&& Crypt::isCatfile( $data )
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2012-11-28 22:39:19 +04:00
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) {
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2013-02-20 23:18:00 +04:00
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2013-02-11 15:12:21 +04:00
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// TODO use get owner to find correct location of key files for shared files
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2013-02-11 14:21:23 +04:00
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$session = new Session();
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$privateKey = $session->getPrivateKey( $userId );
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2012-11-23 00:19:03 +04:00
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2013-02-20 23:18:00 +04:00
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// Get the file owner so we can retrieve its keyfile
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$fileOwner = \OC\Files\Filesystem::getOwner( $relPath ); //NOTE: This might be false! make sure the path passed to it is right
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$fileOwner = 'admin'; // FIXME: Manually set the correct UID for now
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2013-02-11 14:21:23 +04:00
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// Get the encrypted keyfile
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2013-02-20 23:18:00 +04:00
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$encKeyfile = Keymanager::getFileKey( $view, $fileOwner, $relPath );
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2012-07-31 22:28:11 +04:00
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2013-02-20 23:18:00 +04:00
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trigger_error("\$encKeyfile = ". var_export($encKeyfile, 1));
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2012-07-25 19:25:24 +04:00
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2013-02-20 23:18:00 +04:00
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// Attempt to fetch the user's shareKey
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$shareKey = Keymanager::getShareKey( $view, $userId, $relPath );
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trigger_error("\$shareKey = ".var_export($shareKey, 1));
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// Check if key is shared or not
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if ( $shareKey ) {
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2013-02-11 14:21:23 +04:00
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\OC_FileProxy::$enabled = false;
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// Decrypt keyfile with shareKey
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$plainKeyfile = Crypt::multiKeyDecrypt( $encKeyfile, $shareKey, $privateKey );
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2013-02-20 23:18:00 +04:00
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trigger_error("PROXY plainkeyfile = ". var_export($plainKeyfile, 1));
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2013-01-06 17:56:45 +04:00
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2013-02-11 14:21:23 +04:00
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} else {
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// If key is unshared, decrypt with user private key
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$plainKeyfile = Crypt::keyDecrypt( $encKeyfile, $privateKey );
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2013-01-06 17:56:45 +04:00
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2013-02-11 14:21:23 +04:00
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}
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2013-01-14 23:07:28 +04:00
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2013-02-11 14:21:23 +04:00
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$plainData = Crypt::symmetricDecryptFileContent( $data, $plainKeyfile );
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2012-12-11 19:10:56 +04:00
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2012-11-28 22:39:19 +04:00
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} elseif (
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Crypt::mode() == 'server'
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&& isset( $_SESSION['legacyenckey'] )
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2012-12-04 23:53:13 +04:00
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&& Crypt::isEncryptedMeta( $path )
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2012-11-28 22:39:19 +04:00
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) {
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2013-02-11 14:21:23 +04:00
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$plainData = Crypt::legacyDecrypt( $data, $session->getLegacyKey() );
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2012-11-28 22:39:19 +04:00
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2011-10-21 19:02:11 +04:00
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}
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2012-07-25 19:25:24 +04:00
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2012-11-28 22:39:19 +04:00
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\OC_FileProxy::$enabled = true;
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2013-02-11 14:21:23 +04:00
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if ( ! isset( $plainData ) ) {
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2012-12-11 19:10:56 +04:00
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2013-02-11 14:21:23 +04:00
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$plainData = $data;
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2012-12-11 19:10:56 +04:00
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}
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2013-02-11 14:21:23 +04:00
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return $plainData;
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2012-07-31 22:28:11 +04:00
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2011-10-21 19:02:11 +04:00
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}
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2013-01-29 23:54:40 +04:00
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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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2013-01-30 21:25:17 +04:00
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public function preUnlink( $path ) {
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2013-01-29 23:54:40 +04:00
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// Disable encryption proxy to prevent recursive calls
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\OC_FileProxy::$enabled = false;
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$view = new \OC_FilesystemView( '/' );
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2013-01-30 22:52:02 +04:00
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$userId = \OCP\USER::getUser();
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2013-01-29 23:54:40 +04:00
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// Format path to be relative to user files dir
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$trimmed = ltrim( $path, '/' );
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$split = explode( '/', $trimmed );
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$sliced = array_slice( $split, 2 );
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$relPath = implode( '/', $sliced );
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2013-01-30 21:25:17 +04:00
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if ( $view->is_dir( $path ) ) {
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// Dirs must be handled separately as deleteFileKey
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// doesn't handle them
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2013-01-30 22:52:02 +04:00
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$view->unlink( $userId . '/' . 'files_encryption' . '/' . 'keyfiles' . '/'. $relPath );
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2013-01-30 21:25:17 +04:00
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} else {
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// Delete keyfile so it isn't orphaned
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$result = Keymanager::deleteFileKey( $view, $userId, $relPath );
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\OC_FileProxy::$enabled = true;
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return $result;
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}
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2013-01-29 23:54:40 +04:00
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}
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/**
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* @brief When a file is renamed, rename its keyfile also
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* @return bool Result of rename()
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* @note This is pre rather than post because using post didn't work
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*/
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public function preRename( $oldPath, $newPath ) {
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// Disable encryption proxy to prevent recursive calls
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|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
|
|
|
|
$view = new \OC_FilesystemView( '/' );
|
|
|
|
|
|
|
|
$userId = \OCP\USER::getUser();
|
|
|
|
|
|
|
|
// Format paths to be relative to user files dir
|
|
|
|
$oldTrimmed = ltrim( $oldPath, '/' );
|
|
|
|
$oldSplit = explode( '/', $oldTrimmed );
|
|
|
|
$oldSliced = array_slice( $oldSplit, 2 );
|
|
|
|
$oldRelPath = implode( '/', $oldSliced );
|
|
|
|
$oldKeyfilePath = $userId . '/' . 'files_encryption' . '/' . 'keyfiles' . '/' . $oldRelPath . '.key';
|
|
|
|
|
|
|
|
$newTrimmed = ltrim( $newPath, '/' );
|
|
|
|
$newSplit = explode( '/', $newTrimmed );
|
|
|
|
$newSliced = array_slice( $newSplit, 2 );
|
|
|
|
$newRelPath = implode( '/', $newSliced );
|
|
|
|
$newKeyfilePath = $userId . '/' . 'files_encryption' . '/' . 'keyfiles' . '/' . $newRelPath . '.key';
|
|
|
|
|
|
|
|
// Rename keyfile so it isn't orphaned
|
|
|
|
$result = $view->rename( $oldKeyfilePath, $newKeyfilePath );
|
|
|
|
|
|
|
|
\OC_FileProxy::$enabled = true;
|
|
|
|
|
|
|
|
return $result;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2012-07-31 22:28:11 +04:00
|
|
|
public function postFopen( $path, &$result ){
|
2012-11-22 23:36:48 +04:00
|
|
|
|
2012-07-31 22:28:11 +04:00
|
|
|
if ( !$result ) {
|
|
|
|
|
2011-11-24 04:44:54 +04:00
|
|
|
return $result;
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2011-11-24 04:44:54 +04:00
|
|
|
}
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-12-04 23:53:13 +04:00
|
|
|
// Reformat path for use with OC_FSV
|
|
|
|
$path_split = explode( '/', $path );
|
2013-02-09 16:42:18 +04:00
|
|
|
$path_f = implode( '/', array_slice( $path_split, 3 ) );
|
2012-12-04 23:53:13 +04:00
|
|
|
|
2012-10-17 19:35:19 +04:00
|
|
|
// Disable encryption proxy to prevent recursive calls
|
|
|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
|
2012-07-31 22:28:11 +04:00
|
|
|
$meta = stream_get_meta_data( $result );
|
|
|
|
|
2012-11-22 18:08:19 +04:00
|
|
|
$view = new \OC_FilesystemView( '' );
|
2012-10-17 19:35:19 +04:00
|
|
|
|
|
|
|
$util = new Util( $view, \OCP\USER::getUser());
|
|
|
|
|
2012-11-22 23:36:48 +04:00
|
|
|
// If file is already encrypted, decrypt using crypto protocol
|
2012-12-04 23:53:13 +04:00
|
|
|
if (
|
2013-01-24 22:37:34 +04:00
|
|
|
Crypt::mode() == 'server'
|
|
|
|
&& $util->isEncryptedPath( $path )
|
2012-12-04 23:53:13 +04:00
|
|
|
) {
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-11-22 23:36:48 +04:00
|
|
|
// Close the original encrypted file
|
2012-10-17 19:35:19 +04:00
|
|
|
fclose( $result );
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-12-04 23:53:13 +04:00
|
|
|
// Open the file using the crypto stream wrapper
|
|
|
|
// protocol and let it do the decryption work instead
|
|
|
|
$result = fopen( 'crypt://' . $path_f, $meta['mode'] );
|
2012-11-22 23:36:48 +04:00
|
|
|
|
2012-10-17 19:35:19 +04:00
|
|
|
|
2012-11-22 18:08:19 +04:00
|
|
|
} elseif (
|
2013-01-24 22:37:34 +04:00
|
|
|
self::shouldEncrypt( $path )
|
|
|
|
and $meta ['mode'] != 'r'
|
|
|
|
and $meta['mode'] != 'rb'
|
2012-07-31 22:28:11 +04:00
|
|
|
) {
|
2012-12-04 23:53:13 +04:00
|
|
|
// If the file is not yet encrypted, but should be
|
|
|
|
// encrypted when it's saved (it's not read only)
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-12-04 23:53:13 +04:00
|
|
|
// NOTE: this is the case for new files saved via WebDAV
|
2012-11-23 00:19:03 +04:00
|
|
|
|
|
|
|
if (
|
|
|
|
$view->file_exists( $path )
|
|
|
|
and $view->filesize( $path ) > 0
|
|
|
|
) {
|
|
|
|
$x = $view->file_get_contents( $path );
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-11-23 00:19:03 +04:00
|
|
|
$tmp = tmpfile();
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-11-23 00:19:03 +04:00
|
|
|
// // Make a temporary copy of the original file
|
|
|
|
// \OCP\Files::streamCopy( $result, $tmp );
|
|
|
|
//
|
|
|
|
// // Close the original stream, we'll return another one
|
|
|
|
// fclose( $result );
|
|
|
|
//
|
|
|
|
// $view->file_put_contents( $path_f, $tmp );
|
|
|
|
//
|
|
|
|
// fclose( $tmp );
|
|
|
|
|
2011-11-24 04:44:54 +04:00
|
|
|
}
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-11-23 00:19:03 +04:00
|
|
|
$result = fopen( 'crypt://'.$path_f, $meta['mode'] );
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-11-22 18:08:19 +04:00
|
|
|
}
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2012-11-14 17:58:57 +04:00
|
|
|
// Re-enable the proxy
|
|
|
|
\OC_FileProxy::$enabled = true;
|
|
|
|
|
2011-11-24 04:44:54 +04:00
|
|
|
return $result;
|
2012-07-31 22:28:11 +04:00
|
|
|
|
2011-10-21 19:02:11 +04:00
|
|
|
}
|
2012-02-16 00:44:58 +04:00
|
|
|
|
2013-01-24 22:37:34 +04:00
|
|
|
public function postGetMimeType( $path, $mime ) {
|
|
|
|
|
|
|
|
if ( Crypt::isCatfile( $path ) ) {
|
|
|
|
|
|
|
|
$mime = \OCP\Files::getMimeType( 'crypt://' . $path, 'w' );
|
|
|
|
|
2012-02-21 23:48:14 +04:00
|
|
|
}
|
2013-01-24 22:37:34 +04:00
|
|
|
|
2012-02-26 18:56:47 +04:00
|
|
|
return $mime;
|
2013-01-24 22:37:34 +04:00
|
|
|
|
2012-02-16 00:44:58 +04:00
|
|
|
}
|
2012-06-21 19:37:53 +04:00
|
|
|
|
2013-01-24 22:37:34 +04:00
|
|
|
public function postStat( $path, $data ) {
|
|
|
|
|
|
|
|
if ( Crypt::isCatfile( $path ) ) {
|
|
|
|
|
2013-01-31 20:49:07 +04:00
|
|
|
$cached = \OC\Files\Filesystem::getFileInfo( $path, '' );
|
2013-01-24 22:37:34 +04:00
|
|
|
|
|
|
|
$data['size'] = $cached['size'];
|
|
|
|
|
2012-06-21 19:37:53 +04:00
|
|
|
}
|
2013-01-24 22:37:34 +04:00
|
|
|
|
2012-06-21 19:37:53 +04:00
|
|
|
return $data;
|
|
|
|
}
|
|
|
|
|
2013-01-24 22:37:34 +04:00
|
|
|
public function postFileSize( $path, $size ) {
|
|
|
|
|
|
|
|
if ( Crypt::isCatfile( $path ) ) {
|
|
|
|
|
2013-01-31 20:49:07 +04:00
|
|
|
$cached = \OC\Files\Filesystem::getFileInfo( $path, '' );
|
2013-01-24 22:37:34 +04:00
|
|
|
|
2012-06-21 19:37:53 +04:00
|
|
|
return $cached['size'];
|
2013-01-24 22:37:34 +04:00
|
|
|
|
|
|
|
} else {
|
|
|
|
|
2012-06-21 19:37:53 +04:00
|
|
|
return $size;
|
2013-01-24 22:37:34 +04:00
|
|
|
|
2012-06-21 19:37:53 +04:00
|
|
|
}
|
|
|
|
}
|
2011-10-21 19:02:11 +04:00
|
|
|
}
|