2015-01-14 19:39:23 +00:00
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<?php
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/**
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2016-07-21 15:07:57 +00:00
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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2016-05-26 17:56:05 +00:00
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* @author Björn Schießle <bjoern@schiessle.org>
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2015-06-25 09:43:55 +00:00
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* @author jknockaert <jasper@knockaert.nl>
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2016-05-26 17:56:05 +00:00
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* @author Lukas Reschke <lukas@statuscode.ch>
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2016-07-21 15:07:57 +00:00
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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2015-04-07 15:02:49 +00:00
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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2015-06-25 09:43:55 +00:00
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* @author Vincent Petry <pvince81@owncloud.com>
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2015-01-14 19:39:23 +00:00
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*
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2015-04-07 15:02:49 +00:00
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* @license AGPL-3.0
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2015-01-14 19:39:23 +00:00
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*
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2015-04-07 15:02:49 +00:00
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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2015-01-14 19:39:23 +00:00
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*
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2015-04-07 15:02:49 +00:00
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* This program is distributed in the hope that it will be useful,
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2015-01-14 19:39:23 +00:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2015-04-07 15:02:49 +00:00
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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 License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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2015-01-14 19:39:23 +00:00
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*
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*/
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namespace OC\Files\Stream;
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use Icewind\Streams\Wrapper;
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use OC\Encryption\Exceptions\EncryptionHeaderKeyExistsException;
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class Encryption extends Wrapper {
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/** @var \OC\Encryption\Util */
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protected $util;
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2015-03-31 14:23:31 +00:00
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/** @var \OC\Encryption\File */
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protected $file;
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2015-01-14 19:39:23 +00:00
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/** @var \OCP\Encryption\IEncryptionModule */
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protected $encryptionModule;
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/** @var \OC\Files\Storage\Storage */
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protected $storage;
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/** @var \OC\Files\Storage\Wrapper\Encryption */
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protected $encryptionStorage;
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/** @var string */
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protected $internalPath;
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2015-03-30 10:21:59 +00:00
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/** @var string */
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protected $cache;
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2015-01-14 19:39:23 +00:00
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/** @var integer */
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protected $size;
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/** @var integer */
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protected $position;
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/** @var integer */
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protected $unencryptedSize;
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2015-04-24 11:02:06 +00:00
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/** @var integer */
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protected $headerSize;
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2015-01-14 19:39:23 +00:00
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/** @var integer */
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protected $unencryptedBlockSize;
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/** @var array */
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protected $header;
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/** @var string */
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protected $fullPath;
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2016-01-05 18:01:03 +00:00
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/** @var bool */
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protected $signed;
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2015-01-14 19:39:23 +00:00
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/**
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* header data returned by the encryption module, will be written to the file
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* in case of a write operation
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*
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* @var array
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*/
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protected $newHeader;
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/**
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* user who perform the read/write operation null for public access
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*
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2015-03-30 11:59:48 +00:00
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* @var string
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2015-01-14 19:39:23 +00:00
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*/
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protected $uid;
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/** @var bool */
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protected $readOnly;
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2015-03-30 10:21:59 +00:00
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/** @var bool */
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protected $writeFlag;
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2015-01-14 19:39:23 +00:00
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/** @var array */
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protected $expectedContextProperties;
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public function __construct() {
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$this->expectedContextProperties = array(
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'source',
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'storage',
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'internalPath',
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'fullPath',
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'encryptionModule',
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'header',
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'uid',
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2015-03-31 14:23:31 +00:00
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'file',
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2015-01-14 19:39:23 +00:00
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'util',
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'size',
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'unencryptedSize',
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2015-04-24 11:02:06 +00:00
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'encryptionStorage',
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2016-01-05 14:29:44 +00:00
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'headerSize',
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'signed'
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2015-01-14 19:39:23 +00:00
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);
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}
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/**
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* Wraps a stream with the provided callbacks
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*
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* @param resource $source
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* @param string $internalPath relative to mount point
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* @param string $fullPath relative to data/
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* @param array $header
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2015-03-30 11:59:48 +00:00
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* @param string $uid
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2015-01-14 19:39:23 +00:00
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* @param \OCP\Encryption\IEncryptionModule $encryptionModule
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* @param \OC\Files\Storage\Storage $storage
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2015-03-30 11:59:48 +00:00
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* @param \OC\Files\Storage\Wrapper\Encryption $encStorage
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2015-01-14 19:39:23 +00:00
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* @param \OC\Encryption\Util $util
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2015-03-31 14:23:31 +00:00
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* @param \OC\Encryption\File $file
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2015-01-14 19:39:23 +00:00
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* @param string $mode
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* @param int $size
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* @param int $unencryptedSize
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2015-04-24 11:02:06 +00:00
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* @param int $headerSize
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2016-01-05 14:29:44 +00:00
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* @param bool $signed
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2015-05-20 12:29:20 +00:00
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* @param string $wrapper stream wrapper class
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2015-01-14 19:39:23 +00:00
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* @return resource
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*
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* @throws \BadMethodCallException
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*/
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public static function wrap($source, $internalPath, $fullPath, array $header,
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2015-03-30 11:59:48 +00:00
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$uid,
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\OCP\Encryption\IEncryptionModule $encryptionModule,
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\OC\Files\Storage\Storage $storage,
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\OC\Files\Storage\Wrapper\Encryption $encStorage,
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\OC\Encryption\Util $util,
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2015-03-31 14:23:31 +00:00
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\OC\Encryption\File $file,
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2015-03-30 11:59:48 +00:00
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$mode,
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$size,
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2015-04-24 11:02:06 +00:00
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$unencryptedSize,
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2015-05-20 12:29:20 +00:00
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$headerSize,
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2016-01-05 14:29:44 +00:00
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$signed,
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2015-05-20 12:29:20 +00:00
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$wrapper = 'OC\Files\Stream\Encryption') {
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2015-01-14 19:39:23 +00:00
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$context = stream_context_create(array(
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'ocencryption' => array(
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'source' => $source,
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'storage' => $storage,
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'internalPath' => $internalPath,
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'fullPath' => $fullPath,
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'encryptionModule' => $encryptionModule,
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'header' => $header,
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'uid' => $uid,
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'util' => $util,
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2015-03-31 14:23:31 +00:00
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'file' => $file,
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2015-01-14 19:39:23 +00:00
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'size' => $size,
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'unencryptedSize' => $unencryptedSize,
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2015-04-24 11:02:06 +00:00
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'encryptionStorage' => $encStorage,
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2016-01-05 14:29:44 +00:00
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'headerSize' => $headerSize,
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'signed' => $signed
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2015-01-14 19:39:23 +00:00
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)
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));
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2015-11-24 12:25:27 +00:00
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return self::wrapSource($source, $context, 'ocencryption', $wrapper, $mode);
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2015-01-14 19:39:23 +00:00
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}
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/**
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* add stream wrapper
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*
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* @param resource $source
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* @param string $mode
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2016-02-17 13:21:07 +00:00
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* @param resource $context
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2015-01-14 19:39:23 +00:00
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* @param string $protocol
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* @param string $class
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* @return resource
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* @throws \BadMethodCallException
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*/
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2015-11-24 12:25:27 +00:00
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protected static function wrapSource($source, $context, $protocol, $class, $mode = 'r+') {
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2015-01-14 19:39:23 +00:00
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try {
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stream_wrapper_register($protocol, $class);
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if (@rewinddir($source) === false) {
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$wrapped = fopen($protocol . '://', $mode, false, $context);
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} else {
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$wrapped = opendir($protocol . '://', $context);
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}
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} catch (\BadMethodCallException $e) {
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stream_wrapper_unregister($protocol);
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throw $e;
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}
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stream_wrapper_unregister($protocol);
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return $wrapped;
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}
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/**
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* Load the source from the stream context and return the context options
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*
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* @param string $name
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* @return array
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* @throws \BadMethodCallException
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*/
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protected function loadContext($name) {
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$context = parent::loadContext($name);
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foreach ($this->expectedContextProperties as $property) {
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2015-04-01 11:59:29 +00:00
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if (array_key_exists($property, $context)) {
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2015-01-14 19:39:23 +00:00
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$this->{$property} = $context[$property];
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} else {
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throw new \BadMethodCallException('Invalid context, "' . $property . '" options not set');
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}
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}
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return $context;
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}
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public function stream_open($path, $mode, $options, &$opened_path) {
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$this->loadContext('ocencryption');
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$this->position = 0;
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2015-03-30 11:36:56 +00:00
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$this->cache = '';
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$this->writeFlag = false;
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2016-01-05 14:29:44 +00:00
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$this->unencryptedBlockSize = $this->encryptionModule->getUnencryptedBlockSize($this->signed);
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2015-01-14 19:39:23 +00:00
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if (
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$mode === 'w'
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|| $mode === 'w+'
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|| $mode === 'wb'
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|| $mode === 'wb+'
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2015-04-21 12:21:53 +00:00
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|| $mode === 'r+'
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|| $mode === 'rb+'
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2015-01-14 19:39:23 +00:00
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) {
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$this->readOnly = false;
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} else {
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$this->readOnly = true;
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}
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2015-04-21 12:43:08 +00:00
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$sharePath = $this->fullPath;
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if (!$this->storage->file_exists($this->internalPath)) {
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$sharePath = dirname($sharePath);
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}
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2017-05-30 09:59:49 +00:00
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$accessList = [];
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if ($this->encryptionModule->needDetailedAccessList()) {
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$accessList = $this->file->getAccessList($sharePath);
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}
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2015-04-24 11:02:06 +00:00
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$this->newHeader = $this->encryptionModule->begin($this->fullPath, $this->uid, $mode, $this->header, $accessList);
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2015-04-21 12:43:08 +00:00
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2015-04-21 12:21:53 +00:00
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if (
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$mode === 'w'
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|| $mode === 'w+'
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|| $mode === 'wb'
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|| $mode === 'wb+'
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) {
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// We're writing a new file so start write counter with 0 bytes
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$this->unencryptedSize = 0;
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$this->writeHeader();
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2015-04-24 11:02:06 +00:00
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$this->headerSize = $this->util->getHeaderSize();
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$this->size = $this->headerSize;
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2015-04-21 12:21:53 +00:00
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} else {
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2015-04-24 14:47:27 +00:00
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$this->skipHeader();
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2015-04-22 10:28:07 +00:00
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}
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2015-04-24 14:47:27 +00:00
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2015-01-14 19:39:23 +00:00
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return true;
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}
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2015-04-20 15:30:10 +00:00
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public function stream_eof() {
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return $this->position >= $this->unencryptedSize;
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}
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2015-01-14 19:39:23 +00:00
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public function stream_read($count) {
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$result = '';
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2015-05-21 05:51:07 +00:00
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$count = min($count, $this->unencryptedSize - $this->position);
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2015-01-14 19:39:23 +00:00
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while ($count > 0) {
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$remainingLength = $count;
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// update the cache of the current block
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2015-03-30 10:21:59 +00:00
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$this->readCache();
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2015-01-14 19:39:23 +00:00
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// determine the relative position in the current block
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$blockPosition = ($this->position % $this->unencryptedBlockSize);
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// if entire read inside current block then only position needs to be updated
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if ($remainingLength < ($this->unencryptedBlockSize - $blockPosition)) {
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2015-03-30 10:21:59 +00:00
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$result .= substr($this->cache, $blockPosition, $remainingLength);
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2015-01-14 19:39:23 +00:00
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$this->position += $remainingLength;
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$count = 0;
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2015-03-30 11:59:48 +00:00
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// otherwise remainder of current block is fetched, the block is flushed and the position updated
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2015-01-14 19:39:23 +00:00
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} else {
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2015-03-30 10:21:59 +00:00
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$result .= substr($this->cache, $blockPosition);
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$this->flush();
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2015-01-14 19:39:23 +00:00
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$this->position += ($this->unencryptedBlockSize - $blockPosition);
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$count -= ($this->unencryptedBlockSize - $blockPosition);
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}
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}
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return $result;
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}
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public function stream_write($data) {
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$length = 0;
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// loop over $data to fit it in 6126 sized unencrypted blocks
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2015-05-18 11:27:22 +00:00
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while (isset($data[0])) {
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2015-01-14 19:39:23 +00:00
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$remainingLength = strlen($data);
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2015-03-30 10:21:59 +00:00
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// set the cache to the current 6126 block
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$this->readCache();
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2015-01-14 19:39:23 +00:00
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// for seekable streams the pointer is moved back to the beginning of the encrypted block
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// flush will start writing there when the position moves to another block
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2015-04-15 11:17:01 +00:00
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|
$positionInFile = (int)floor($this->position / $this->unencryptedBlockSize) *
|
2015-04-24 11:02:06 +00:00
|
|
|
$this->util->getBlockSize() + $this->headerSize;
|
2015-05-20 12:29:20 +00:00
|
|
|
$resultFseek = $this->parentStreamSeek($positionInFile);
|
2015-01-14 19:39:23 +00:00
|
|
|
|
|
|
|
// only allow writes on seekable streams, or at the end of the encrypted stream
|
2015-03-30 10:21:59 +00:00
|
|
|
if (!($this->readOnly) && ($resultFseek || $positionInFile === $this->size)) {
|
|
|
|
|
|
|
|
// switch the writeFlag so flush() will write the block
|
2015-03-30 11:59:48 +00:00
|
|
|
$this->writeFlag = true;
|
2015-01-14 19:39:23 +00:00
|
|
|
|
|
|
|
// determine the relative position in the current block
|
|
|
|
$blockPosition = ($this->position % $this->unencryptedBlockSize);
|
|
|
|
// check if $data fits in current block
|
|
|
|
// if so, overwrite existing data (if any)
|
|
|
|
// update position and liberate $data
|
|
|
|
if ($remainingLength < ($this->unencryptedBlockSize - $blockPosition)) {
|
2015-03-30 10:21:59 +00:00
|
|
|
$this->cache = substr($this->cache, 0, $blockPosition)
|
|
|
|
. $data . substr($this->cache, $blockPosition + $remainingLength);
|
2015-01-14 19:39:23 +00:00
|
|
|
$this->position += $remainingLength;
|
|
|
|
$length += $remainingLength;
|
|
|
|
$data = '';
|
2015-03-30 11:59:48 +00:00
|
|
|
// if $data doesn't fit the current block, the fill the current block and reiterate
|
|
|
|
// after the block is filled, it is flushed and $data is updatedxxx
|
2015-01-14 19:39:23 +00:00
|
|
|
} else {
|
2015-03-30 10:21:59 +00:00
|
|
|
$this->cache = substr($this->cache, 0, $blockPosition) .
|
2015-01-14 19:39:23 +00:00
|
|
|
substr($data, 0, $this->unencryptedBlockSize - $blockPosition);
|
2015-03-30 10:21:59 +00:00
|
|
|
$this->flush();
|
2015-01-14 19:39:23 +00:00
|
|
|
$this->position += ($this->unencryptedBlockSize - $blockPosition);
|
|
|
|
$length += ($this->unencryptedBlockSize - $blockPosition);
|
|
|
|
$data = substr($data, $this->unencryptedBlockSize - $blockPosition);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
$data = '';
|
|
|
|
}
|
2015-05-18 13:06:55 +00:00
|
|
|
$this->unencryptedSize = max($this->unencryptedSize, $this->position);
|
2015-01-14 19:39:23 +00:00
|
|
|
}
|
|
|
|
return $length;
|
|
|
|
}
|
|
|
|
|
|
|
|
public function stream_tell() {
|
|
|
|
return $this->position;
|
|
|
|
}
|
|
|
|
|
|
|
|
public function stream_seek($offset, $whence = SEEK_SET) {
|
|
|
|
|
|
|
|
$return = false;
|
|
|
|
|
|
|
|
switch ($whence) {
|
|
|
|
case SEEK_SET:
|
2015-04-30 15:10:18 +00:00
|
|
|
$newPosition = $offset;
|
2015-01-14 19:39:23 +00:00
|
|
|
break;
|
|
|
|
case SEEK_CUR:
|
2015-04-30 15:10:18 +00:00
|
|
|
$newPosition = $this->position + $offset;
|
2015-01-14 19:39:23 +00:00
|
|
|
break;
|
|
|
|
case SEEK_END:
|
2015-04-30 15:10:18 +00:00
|
|
|
$newPosition = $this->unencryptedSize + $offset;
|
2015-01-14 19:39:23 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return $return;
|
|
|
|
}
|
|
|
|
|
2015-04-30 15:10:18 +00:00
|
|
|
if ($newPosition > $this->unencryptedSize || $newPosition < 0) {
|
|
|
|
return $return;
|
|
|
|
}
|
|
|
|
|
2015-01-14 19:39:23 +00:00
|
|
|
$newFilePosition = floor($newPosition / $this->unencryptedBlockSize)
|
2015-04-24 11:02:06 +00:00
|
|
|
* $this->util->getBlockSize() + $this->headerSize;
|
2015-01-14 19:39:23 +00:00
|
|
|
|
2015-04-02 12:52:54 +00:00
|
|
|
$oldFilePosition = parent::stream_tell();
|
2015-05-20 12:29:20 +00:00
|
|
|
if ($this->parentStreamSeek($newFilePosition)) {
|
|
|
|
$this->parentStreamSeek($oldFilePosition);
|
2015-03-30 10:21:59 +00:00
|
|
|
$this->flush();
|
2015-05-20 12:29:20 +00:00
|
|
|
$this->parentStreamSeek($newFilePosition);
|
2015-01-14 19:39:23 +00:00
|
|
|
$this->position = $newPosition;
|
|
|
|
$return = true;
|
|
|
|
}
|
|
|
|
return $return;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
public function stream_close() {
|
2016-02-03 13:32:04 +00:00
|
|
|
$this->flush('end');
|
|
|
|
$position = (int)floor($this->position/$this->unencryptedBlockSize);
|
|
|
|
$remainingData = $this->encryptionModule->end($this->fullPath, $position . 'end');
|
2015-03-30 14:07:41 +00:00
|
|
|
if ($this->readOnly === false) {
|
|
|
|
if(!empty($remainingData)) {
|
|
|
|
parent::stream_write($remainingData);
|
|
|
|
}
|
|
|
|
$this->encryptionStorage->updateUnencryptedSize($this->fullPath, $this->unencryptedSize);
|
|
|
|
}
|
2015-01-14 19:39:23 +00:00
|
|
|
return parent::stream_close();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2015-03-30 10:21:59 +00:00
|
|
|
* write block to file
|
2016-02-03 13:32:04 +00:00
|
|
|
* @param string $positionPrefix
|
2015-01-14 19:39:23 +00:00
|
|
|
*/
|
2016-02-03 13:32:04 +00:00
|
|
|
protected function flush($positionPrefix = '') {
|
2015-03-30 10:21:59 +00:00
|
|
|
// write to disk only when writeFlag was set to 1
|
|
|
|
if ($this->writeFlag) {
|
|
|
|
// Disable the file proxies so that encryption is not
|
|
|
|
// automatically attempted when the file is written to disk -
|
|
|
|
// we are handling that separately here and we don't want to
|
|
|
|
// get into an infinite loop
|
2016-02-03 13:32:04 +00:00
|
|
|
$position = (int)floor($this->position/$this->unencryptedBlockSize);
|
|
|
|
$encrypted = $this->encryptionModule->encrypt($this->cache, $position . $positionPrefix);
|
2015-05-22 20:13:27 +00:00
|
|
|
$bytesWritten = parent::stream_write($encrypted);
|
2015-03-30 10:21:59 +00:00
|
|
|
$this->writeFlag = false;
|
2015-05-22 20:13:27 +00:00
|
|
|
// Check whether the write concerns the last block
|
|
|
|
// If so then update the encrypted filesize
|
2015-05-20 07:35:20 +00:00
|
|
|
// Note that the unencrypted pointer and filesize are NOT yet updated when flush() is called
|
|
|
|
// We recalculate the encrypted filesize as we do not know the context of calling flush()
|
2015-05-22 20:13:27 +00:00
|
|
|
$completeBlocksInFile=(int)floor($this->unencryptedSize/$this->unencryptedBlockSize);
|
|
|
|
if ($completeBlocksInFile === (int)floor($this->position/$this->unencryptedBlockSize)) {
|
|
|
|
$this->size = $this->util->getBlockSize() * $completeBlocksInFile;
|
|
|
|
$this->size += $bytesWritten;
|
2015-05-20 07:35:20 +00:00
|
|
|
$this->size += $this->headerSize;
|
|
|
|
}
|
2015-01-14 19:39:23 +00:00
|
|
|
}
|
2015-03-30 10:21:59 +00:00
|
|
|
// always empty the cache (otherwise readCache() will not fill it with the new block)
|
|
|
|
$this->cache = '';
|
2015-01-14 19:39:23 +00:00
|
|
|
}
|
|
|
|
|
2015-03-30 10:21:59 +00:00
|
|
|
/**
|
|
|
|
* read block to file
|
|
|
|
*/
|
|
|
|
protected function readCache() {
|
|
|
|
// cache should always be empty string when this function is called
|
|
|
|
// don't try to fill the cache when trying to write at the end of the unencrypted file when it coincides with new block
|
2015-03-30 11:59:48 +00:00
|
|
|
if ($this->cache === '' && !($this->position === $this->unencryptedSize && ($this->position % $this->unencryptedBlockSize) === 0)) {
|
2015-03-30 10:21:59 +00:00
|
|
|
// Get the data from the file handle
|
|
|
|
$data = parent::stream_read($this->util->getBlockSize());
|
2016-02-03 13:32:04 +00:00
|
|
|
$position = (int)floor($this->position/$this->unencryptedBlockSize);
|
|
|
|
$numberOfChunks = (int)($this->unencryptedSize / $this->unencryptedBlockSize);
|
|
|
|
if($numberOfChunks === $position) {
|
|
|
|
$position .= 'end';
|
|
|
|
}
|
|
|
|
$this->cache = $this->encryptionModule->decrypt($data, $position);
|
2015-03-30 10:21:59 +00:00
|
|
|
}
|
|
|
|
}
|
2015-01-14 19:39:23 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* write header at beginning of encrypted file
|
|
|
|
*
|
2015-03-30 15:13:42 +00:00
|
|
|
* @return integer
|
2015-01-14 19:39:23 +00:00
|
|
|
* @throws EncryptionHeaderKeyExistsException if header key is already in use
|
|
|
|
*/
|
2015-04-24 14:47:27 +00:00
|
|
|
protected function writeHeader() {
|
2015-01-14 19:39:23 +00:00
|
|
|
$header = $this->util->createHeader($this->newHeader, $this->encryptionModule);
|
2015-03-30 15:13:42 +00:00
|
|
|
return parent::stream_write($header);
|
2015-01-14 19:39:23 +00:00
|
|
|
}
|
|
|
|
|
2015-04-24 14:47:27 +00:00
|
|
|
/**
|
|
|
|
* read first block to skip the header
|
|
|
|
*/
|
|
|
|
protected function skipHeader() {
|
2015-04-24 11:02:06 +00:00
|
|
|
parent::stream_read($this->headerSize);
|
2015-04-24 14:47:27 +00:00
|
|
|
}
|
|
|
|
|
2015-05-20 12:29:20 +00:00
|
|
|
/**
|
|
|
|
* call stream_seek() from parent class
|
|
|
|
*
|
|
|
|
* @param integer $position
|
|
|
|
* @return bool
|
|
|
|
*/
|
|
|
|
protected function parentStreamSeek($position) {
|
|
|
|
return parent::stream_seek($position);
|
|
|
|
}
|
|
|
|
|
2015-11-18 16:32:09 +00:00
|
|
|
/**
|
|
|
|
* @param string $path
|
|
|
|
* @param array $options
|
|
|
|
* @return bool
|
|
|
|
*/
|
|
|
|
public function dir_opendir($path, $options) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2015-01-14 19:39:23 +00:00
|
|
|
}
|