441 lines
11 KiB
PHP
441 lines
11 KiB
PHP
<?php
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/**
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* @author Björn Schießle <schiessle@owncloud.com>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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* @license AGPL-3.0
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*
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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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*
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* This program 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 License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Encryption;
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use OC\Encryption\Exceptions\EncryptionHeaderKeyExistsException;
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use OC\Encryption\Exceptions\EncryptionHeaderToLargeException;
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use OC\Encryption\Exceptions\ModuleDoesNotExistsException;
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use OC\Files\Filesystem;
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use OC\Files\Storage\Wrapper\Encryption;
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use OC\Files\View;
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use OCP\Encryption\IEncryptionModule;
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use OCP\Files\Mount\IMountPoint;
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use OCP\Files\Storage;
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use OCP\IConfig;
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class Util {
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const HEADER_START = 'HBEGIN';
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const HEADER_END = 'HEND';
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const HEADER_PADDING_CHAR = '-';
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const HEADER_ENCRYPTION_MODULE_KEY = 'oc_encryption_module';
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/**
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* block size will always be 8192 for a PHP stream
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* @see https://bugs.php.net/bug.php?id=21641
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* @var integer
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*/
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protected $headerSize = 8192;
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/**
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* block size will always be 8192 for a PHP stream
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* @see https://bugs.php.net/bug.php?id=21641
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* @var integer
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*/
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protected $blockSize = 8192;
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/** @var View */
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protected $view;
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/** @var array */
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protected $ocHeaderKeys;
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/** @var \OC\User\Manager */
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protected $userManager;
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/** @var IConfig */
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protected $config;
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/** @var array paths excluded from encryption */
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protected $excludedPaths;
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/** @var \OC\Group\Manager $manager */
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protected $groupManager;
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/**
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*
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* @param \OC\Files\View $view
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* @param \OC\User\Manager $userManager
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* @param \OC\Group\Manager $groupManager
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* @param IConfig $config
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*/
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public function __construct(
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\OC\Files\View $view,
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\OC\User\Manager $userManager,
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\OC\Group\Manager $groupManager,
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IConfig $config) {
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$this->ocHeaderKeys = [
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self::HEADER_ENCRYPTION_MODULE_KEY
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];
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$this->view = $view;
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$this->userManager = $userManager;
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$this->groupManager = $groupManager;
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$this->config = $config;
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$this->excludedPaths[] = 'files_encryption';
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}
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/**
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* read encryption module ID from header
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*
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* @param array $header
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* @return string
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* @throws ModuleDoesNotExistsException
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*/
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public function getEncryptionModuleId(array $header = null) {
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$id = '';
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$encryptionModuleKey = self::HEADER_ENCRYPTION_MODULE_KEY;
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if (isset($header[$encryptionModuleKey])) {
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$id = $header[$encryptionModuleKey];
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} elseif (isset($header['cipher'])) {
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if (class_exists('\OCA\Encryption\Crypto\Encryption')) {
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// fall back to default encryption if the user migrated from
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// ownCloud <= 8.0 with the old encryption
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$id = \OCA\Encryption\Crypto\Encryption::ID;
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} else {
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throw new ModuleDoesNotExistsException('Default encryption module missing');
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}
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}
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return $id;
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}
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/**
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* read header into array
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*
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* @param string $header
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* @return array
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*/
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public function readHeader($header) {
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$result = array();
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if (substr($header, 0, strlen(self::HEADER_START)) === self::HEADER_START) {
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$endAt = strpos($header, self::HEADER_END);
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if ($endAt !== false) {
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$header = substr($header, 0, $endAt + strlen(self::HEADER_END));
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// +1 to not start with an ':' which would result in empty element at the beginning
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$exploded = explode(':', substr($header, strlen(self::HEADER_START)+1));
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$element = array_shift($exploded);
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while ($element !== self::HEADER_END) {
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$result[$element] = array_shift($exploded);
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$element = array_shift($exploded);
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}
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}
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}
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return $result;
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}
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/**
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* create header for encrypted file
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*
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* @param array $headerData
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* @param IEncryptionModule $encryptionModule
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* @return string
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* @throws EncryptionHeaderToLargeException if header has to many arguments
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* @throws EncryptionHeaderKeyExistsException if header key is already in use
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*/
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public function createHeader(array $headerData, IEncryptionModule $encryptionModule) {
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$header = self::HEADER_START . ':' . self::HEADER_ENCRYPTION_MODULE_KEY . ':' . $encryptionModule->getId() . ':';
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foreach ($headerData as $key => $value) {
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if (in_array($key, $this->ocHeaderKeys)) {
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throw new EncryptionHeaderKeyExistsException($key);
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}
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$header .= $key . ':' . $value . ':';
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}
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$header .= self::HEADER_END;
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if (strlen($header) > $this->getHeaderSize()) {
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throw new EncryptionHeaderToLargeException();
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}
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$paddedHeader = str_pad($header, $this->headerSize, self::HEADER_PADDING_CHAR, STR_PAD_RIGHT);
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return $paddedHeader;
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}
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/**
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* go recursively through a dir and collect all files and sub files.
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*
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* @param string $dir relative to the users files folder
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* @return array with list of files relative to the users files folder
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*/
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public function getAllFiles($dir) {
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$result = array();
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$dirList = array($dir);
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while ($dirList) {
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$dir = array_pop($dirList);
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$content = $this->view->getDirectoryContent($dir);
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foreach ($content as $c) {
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if ($c->getType() === 'dir') {
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$dirList[] = $c->getPath();
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} else {
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$result[] = $c->getPath();
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}
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}
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}
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return $result;
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}
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/**
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* check if it is a file uploaded by the user stored in data/user/files
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* or a metadata file
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*
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* @param string $path relative to the data/ folder
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* @return boolean
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*/
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public function isFile($path) {
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$parts = explode('/', Filesystem::normalizePath($path), 4);
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if (isset($parts[2]) && $parts[2] === 'files') {
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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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* return size of encryption header
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*
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* @return integer
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*/
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public function getHeaderSize() {
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return $this->headerSize;
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}
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/**
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* return size of block read by a PHP stream
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*
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* @return integer
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*/
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public function getBlockSize() {
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return $this->blockSize;
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}
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/**
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* get the owner and the path for the file relative to the owners files folder
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*
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* @param string $path
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* @return array
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* @throws \BadMethodCallException
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*/
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public function getUidAndFilename($path) {
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$parts = explode('/', $path);
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$uid = '';
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if (count($parts) > 2) {
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$uid = $parts[1];
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}
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if (!$this->userManager->userExists($uid)) {
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throw new \BadMethodCallException(
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'path needs to be relative to the system wide data folder and point to a user specific file'
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);
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}
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$ownerPath = implode('/', array_slice($parts, 2));
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return array($uid, Filesystem::normalizePath($ownerPath));
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}
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/**
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* Remove .path extension from a file path
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* @param string $path Path that may identify a .part file
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* @return string File path without .part extension
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* @note this is needed for reusing keys
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*/
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public function stripPartialFileExtension($path) {
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$extension = pathinfo($path, PATHINFO_EXTENSION);
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if ( $extension === 'part') {
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$newLength = strlen($path) - 5; // 5 = strlen(".part")
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$fPath = substr($path, 0, $newLength);
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// if path also contains a transaction id, we remove it too
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$extension = pathinfo($fPath, PATHINFO_EXTENSION);
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if(substr($extension, 0, 12) === 'ocTransferId') { // 12 = strlen("ocTransferId")
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$newLength = strlen($fPath) - strlen($extension) -1;
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$fPath = substr($fPath, 0, $newLength);
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}
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return $fPath;
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} else {
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return $path;
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}
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}
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public function getUserWithAccessToMountPoint($users, $groups) {
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$result = array();
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if (in_array('all', $users)) {
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$result = \OCP\User::getUsers();
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} else {
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$result = array_merge($result, $users);
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foreach ($groups as $group) {
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$result = array_merge($result, \OC_Group::usersInGroup($group));
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}
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}
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return $result;
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}
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/**
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* check if the file is stored on a system wide mount point
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* @param string $path relative to /data/user with leading '/'
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* @param string $uid
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* @return boolean
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*/
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public function isSystemWideMountPoint($path, $uid) {
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if (\OCP\App::isEnabled("files_external")) {
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$mounts = \OC_Mount_Config::getSystemMountPoints();
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foreach ($mounts as $mount) {
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if (strpos($path, '/files/' . $mount['mountpoint']) === 0) {
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if ($this->isMountPointApplicableToUser($mount, $uid)) {
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return true;
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}
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}
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}
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}
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return false;
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}
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/**
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* check if mount point is applicable to user
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*
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* @param array $mount contains $mount['applicable']['users'], $mount['applicable']['groups']
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* @param string $uid
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* @return boolean
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*/
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private function isMountPointApplicableToUser($mount, $uid) {
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$acceptedUids = array('all', $uid);
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// check if mount point is applicable for the user
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$intersection = array_intersect($acceptedUids, $mount['applicable']['users']);
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if (!empty($intersection)) {
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return true;
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}
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// check if mount point is applicable for group where the user is a member
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foreach ($mount['applicable']['groups'] as $gid) {
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if ($this->groupManager->isInGroup($uid, $gid)) {
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return true;
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}
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}
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return false;
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}
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/**
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* check if it is a path which is excluded by ownCloud from encryption
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*
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* @param string $path
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* @return boolean
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*/
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public function isExcluded($path) {
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$normalizedPath = \OC\Files\Filesystem::normalizePath($path);
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$root = explode('/', $normalizedPath, 4);
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if (count($root) > 1) {
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//detect system wide folders
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if (in_array($root[1], $this->excludedPaths)) {
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return true;
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}
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// detect user specific folders
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if ($this->userManager->userExists($root[1])
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&& in_array($root[2], $this->excludedPaths)) {
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return true;
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}
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}
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return false;
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}
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/**
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* check if recovery key is enabled for user
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*
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* @param string $uid
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* @return boolean
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*/
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public function recoveryEnabled($uid) {
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$enabled = $this->config->getUserValue($uid, 'encryption', 'recovery_enabled', '0');
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return ($enabled === '1') ? true : false;
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}
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/**
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* Wraps the given storage when it is not a shared storage
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*
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* @param string $mountPoint
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* @param Storage $storage
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* @param IMountPoint $mount
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* @return Encryption|Storage
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*/
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public function wrapStorage($mountPoint, Storage $storage, IMountPoint $mount) {
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$parameters = [
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'storage' => $storage,
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'mountPoint' => $mountPoint,
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'mount' => $mount];
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if (!$storage->instanceOfStorage('OC\Files\Storage\Shared')
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&& !$storage->instanceOfStorage('OCA\Files_Sharing\External\Storage')
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&& !$storage->instanceOfStorage('OC\Files\Storage\OwnCloud')) {
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$manager = \OC::$server->getEncryptionManager();
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$user = \OC::$server->getUserSession()->getUser();
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$logger = \OC::$server->getLogger();
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$mountManager = Filesystem::getMountManager();
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$uid = $user ? $user->getUID() : null;
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$fileHelper = \OC::$server->getEncryptionFilesHelper();
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$keyStorage = \OC::$server->getEncryptionKeyStorage();
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$update = new Update(
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new View(),
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$this,
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Filesystem::getMountManager(),
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$manager,
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$fileHelper,
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$uid
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);
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return new Encryption(
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$parameters,
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$manager,
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$this,
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$logger,
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$fileHelper,
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$uid,
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$keyStorage,
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$update,
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$mountManager
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);
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} else {
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return $storage;
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}
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}
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}
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