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288 lines
7.8 KiB
288 lines
7.8 KiB
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Bjoern Schiessle <bjoern@schiessle.org>
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* @author Björn Schießle <bjoern@schiessle.org>
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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*
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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\Security;
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use OC\Files\Filesystem;
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use OCP\ICertificateManager;
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use OCP\IConfig;
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use OCP\ILogger;
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use OCP\Security\ISecureRandom;
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/**
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* Manage trusted certificates for users
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*/
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class CertificateManager implements ICertificateManager {
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/**
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* @var string
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*/
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protected $uid;
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/**
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* @var \OC\Files\View
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*/
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protected $view;
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/**
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* @var IConfig
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*/
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protected $config;
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/**
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* @var ILogger
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*/
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protected $logger;
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/** @var ISecureRandom */
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protected $random;
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/**
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* @param string $uid
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* @param \OC\Files\View $view relative to data/
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* @param IConfig $config
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* @param ILogger $logger
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* @param ISecureRandom $random
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*/
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public function __construct($uid,
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\OC\Files\View $view,
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IConfig $config,
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ILogger $logger,
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ISecureRandom $random) {
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$this->uid = $uid;
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$this->view = $view;
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$this->config = $config;
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$this->logger = $logger;
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$this->random = $random;
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}
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/**
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* Returns all certificates trusted by the user
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*
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* @return \OCP\ICertificate[]
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*/
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public function listCertificates() {
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if (!$this->config->getSystemValue('installed', false)) {
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return [];
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}
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$path = $this->getPathToCertificates() . 'uploads/';
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if (!$this->view->is_dir($path)) {
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return [];
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}
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$result = [];
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$handle = $this->view->opendir($path);
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if (!is_resource($handle)) {
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return [];
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}
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while (false !== ($file = readdir($handle))) {
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if ($file != '.' && $file != '..') {
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try {
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$result[] = new Certificate($this->view->file_get_contents($path . $file), $file);
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} catch (\Exception $e) {
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}
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}
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}
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closedir($handle);
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return $result;
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}
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/**
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* create the certificate bundle of all trusted certificated
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*/
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public function createCertificateBundle() {
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$path = $this->getPathToCertificates();
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$certs = $this->listCertificates();
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if (!$this->view->file_exists($path)) {
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$this->view->mkdir($path);
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}
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$defaultCertificates = file_get_contents(\OC::$SERVERROOT . '/resources/config/ca-bundle.crt');
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if (strlen($defaultCertificates) < 1024) { // sanity check to verify that we have some content for our bundle
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// log as exception so we have a stacktrace
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$this->logger->logException(new \Exception('Shipped ca-bundle is empty, refusing to create certificate bundle'));
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return;
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}
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$certPath = $path . 'rootcerts.crt';
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$tmpPath = $certPath . '.tmp' . $this->random->generate(10, ISecureRandom::CHAR_DIGITS);
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$fhCerts = $this->view->fopen($tmpPath, 'w');
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// Write user certificates
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foreach ($certs as $cert) {
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$file = $path . '/uploads/' . $cert->getName();
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$data = $this->view->file_get_contents($file);
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if (strpos($data, 'BEGIN CERTIFICATE')) {
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fwrite($fhCerts, $data);
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fwrite($fhCerts, "\r\n");
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}
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}
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// Append the default certificates
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fwrite($fhCerts, $defaultCertificates);
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// Append the system certificate bundle
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$systemBundle = $this->getCertificateBundle(null);
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if ($systemBundle !== $certPath && $this->view->file_exists($systemBundle)) {
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$systemCertificates = $this->view->file_get_contents($systemBundle);
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fwrite($fhCerts, $systemCertificates);
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}
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fclose($fhCerts);
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$this->view->rename($tmpPath, $certPath);
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}
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/**
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* Save the certificate and re-generate the certificate bundle
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*
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* @param string $certificate the certificate data
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* @param string $name the filename for the certificate
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* @return \OCP\ICertificate
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* @throws \Exception If the certificate could not get added
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*/
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public function addCertificate($certificate, $name) {
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if (!Filesystem::isValidPath($name) or Filesystem::isFileBlacklisted($name)) {
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throw new \Exception('Filename is not valid');
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}
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$dir = $this->getPathToCertificates() . 'uploads/';
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if (!$this->view->file_exists($dir)) {
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$this->view->mkdir($dir);
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}
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try {
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$file = $dir . $name;
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$certificateObject = new Certificate($certificate, $name);
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$this->view->file_put_contents($file, $certificate);
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$this->createCertificateBundle();
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return $certificateObject;
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} catch (\Exception $e) {
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throw $e;
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}
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}
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/**
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* Remove the certificate and re-generate the certificate bundle
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*
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* @param string $name
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* @return bool
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*/
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public function removeCertificate($name) {
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if (!Filesystem::isValidPath($name)) {
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return false;
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}
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$path = $this->getPathToCertificates() . 'uploads/';
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if ($this->view->file_exists($path . $name)) {
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$this->view->unlink($path . $name);
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$this->createCertificateBundle();
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}
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return true;
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}
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/**
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* Get the path to the certificate bundle for this user
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*
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* @param string|null $uid (optional) user to get the certificate bundle for, use `null` to get the system bundle
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* @return string
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*/
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public function getCertificateBundle($uid = '') {
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if ($uid === '') {
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$uid = $this->uid;
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}
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return $this->getPathToCertificates($uid) . 'rootcerts.crt';
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}
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/**
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* Get the full local path to the certificate bundle for this user
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*
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* @param string $uid (optional) user to get the certificate bundle for, use `null` to get the system bundle
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* @return string
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*/
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public function getAbsoluteBundlePath($uid = '') {
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if ($uid === '') {
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$uid = $this->uid;
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}
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if ($this->needsRebundling($uid)) {
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if (is_null($uid)) {
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$manager = new CertificateManager(null, $this->view, $this->config, $this->logger, $this->random);
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$manager->createCertificateBundle();
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} else {
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$this->createCertificateBundle();
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}
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}
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return $this->view->getLocalFile($this->getCertificateBundle($uid));
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}
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/**
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* @param string|null $uid (optional) user to get the certificate path for, use `null` to get the system path
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* @return string
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*/
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private function getPathToCertificates($uid = '') {
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if ($uid === '') {
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$uid = $this->uid;
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}
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return is_null($uid) ? '/files_external/' : '/' . $uid . '/files_external/';
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}
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/**
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* Check if we need to re-bundle the certificates because one of the sources has updated
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*
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* @param string $uid (optional) user to get the certificate path for, use `null` to get the system path
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* @return bool
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*/
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private function needsRebundling($uid = '') {
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if ($uid === '') {
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$uid = $this->uid;
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}
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$sourceMTimes = [$this->getFilemtimeOfCaBundle()];
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$targetBundle = $this->getCertificateBundle($uid);
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if (!$this->view->file_exists($targetBundle)) {
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return true;
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}
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if (!is_null($uid)) { // also depend on the system bundle
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$sourceMTimes[] = $this->view->filemtime($this->getCertificateBundle(null));
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}
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$sourceMTime = array_reduce($sourceMTimes, function ($max, $mtime) {
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return max($max, $mtime);
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}, 0);
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return $sourceMTime > $this->view->filemtime($targetBundle);
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}
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/**
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* get mtime of ca-bundle shipped by Nextcloud
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*
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* @return int
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*/
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protected function getFilemtimeOfCaBundle() {
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return filemtime(\OC::$SERVERROOT . '/resources/config/ca-bundle.crt');
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}
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}
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