bc6d17ed74
Without /dev/urandom being available to read the medium RNG will rely only on the following components on a Linux system: 1. MicroTime: microtime() . memory_get_usage() as seed and then a garbage collected microtime for loop 2. MTRand: chr((mt_rand() ^ mt_rand()) % 256) 3. Rand: chr((rand() ^ rand()) % 256) 4. UniqId: Plain uniqid() An adversary with the possibility to predict the seed used by the PHP process may thus be able to predict future tokens which is an unwanted behaviour. One should note that this behaviour is documented in our documentation to ensure that users get aware of this even without reading our documentation this will add a post setup check to the administrative interface. Thanks to David Black from d1b.org for bringing this again to our attention.
125 lines
3.2 KiB
PHP
125 lines
3.2 KiB
PHP
<?php
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/**
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* @author Lukas Reschke <lukas@owncloud.com>
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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\Settings\Controller;
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use OCP\AppFramework\Controller;
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use OCP\AppFramework\Http\DataResponse;
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use OCP\Http\Client\IClientService;
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use OCP\IConfig;
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use OCP\IRequest;
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use OC_Util;
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use OCP\IURLGenerator;
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/**
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* @package OC\Settings\Controller
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*/
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class CheckSetupController extends Controller {
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/** @var IConfig */
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private $config;
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/** @var IClientService */
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private $clientService;
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/** @var \OC_Util */
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private $util;
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/** @var IURLGenerator */
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private $urlGenerator;
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/**
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* @param string $AppName
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* @param IRequest $request
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* @param IConfig $config
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* @param IClientService $clientService
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* @param IURLGenerator $urlGenerator
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* @param \OC_Util $util
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*/
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public function __construct($AppName,
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IRequest $request,
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IConfig $config,
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IClientService $clientService,
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IURLGenerator $urlGenerator,
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\OC_Util $util) {
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parent::__construct($AppName, $request);
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$this->config = $config;
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$this->clientService = $clientService;
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$this->util = $util;
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$this->urlGenerator = $urlGenerator;
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}
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/**
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* Checks if the ownCloud server can connect to the internet using HTTPS and HTTP
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* @return bool
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*/
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private function isInternetConnectionWorking() {
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if ($this->config->getSystemValue('has_internet_connection', true) === false) {
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return false;
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}
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try {
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$client = $this->clientService->newClient();
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$client->get('https://www.owncloud.org/');
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$client->get('http://www.owncloud.org/');
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return true;
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} catch (\Exception $e) {
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return false;
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}
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}
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/**
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* Checks whether a local memcache is installed or not
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* @return bool
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*/
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private function isMemcacheConfigured() {
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return $this->config->getSystemValue('memcache.local', null) !== null;
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}
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/**
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* Whether /dev/urandom is available to the PHP controller
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*
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* @return bool
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*/
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private function isUrandomAvailable() {
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if(@file_exists('/dev/urandom')) {
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$file = fopen('/dev/urandom', 'rb');
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if($file) {
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fclose($file);
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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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* @return DataResponse
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*/
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public function check() {
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return new DataResponse(
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[
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'serverHasInternetConnection' => $this->isInternetConnectionWorking(),
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'dataDirectoryProtected' => $this->util->isHtaccessWorking($this->config),
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'isMemcacheConfigured' => $this->isMemcacheConfigured(),
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'memcacheDocs' => $this->urlGenerator->linkToDocs('admin-performance'),
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'isUrandomAvailable' => $this->isUrandomAvailable(),
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'securityDocs' => $this->urlGenerator->linkToDocs('admin-security'),
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]
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);
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}
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}
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