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5f3abffe6f
Whilst we currently state that SSRF is generally outside of our threat model, this is something where we should invest to improve this. Signed-off-by: Lukas Reschke <lukas@statuscode.ch>
403 lines
14 KiB
PHP
403 lines
14 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Carlos Ferreira <carlos@reendex.com>
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Daniel Kesselberg <mail@danielkesselberg.de>
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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 Mohammed Abdellatif <m.latief@gmail.com>
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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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* @author Scott Shambarger <devel@shambarger.net>
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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\Http\Client;
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use GuzzleHttp\Client as GuzzleClient;
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use GuzzleHttp\RequestOptions;
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use OCP\Http\Client\IClient;
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use OCP\Http\Client\IResponse;
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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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/**
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* Class Client
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*
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* @package OC\Http
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*/
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class Client implements IClient {
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/** @var GuzzleClient */
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private $client;
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/** @var IConfig */
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private $config;
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/** @var ILogger */
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private $logger;
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/** @var ICertificateManager */
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private $certificateManager;
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/** @var LocalAddressChecker */
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private $localAddressChecker;
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public function __construct(
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IConfig $config,
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ILogger $logger,
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ICertificateManager $certificateManager,
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GuzzleClient $client,
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LocalAddressChecker $localAddressChecker
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) {
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$this->config = $config;
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$this->logger = $logger;
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$this->client = $client;
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$this->certificateManager = $certificateManager;
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$this->localAddressChecker = $localAddressChecker;
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}
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private function buildRequestOptions(array $options): array {
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$proxy = $this->getProxyUri();
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$defaults = [
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RequestOptions::VERIFY => $this->getCertBundle(),
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RequestOptions::TIMEOUT => 30,
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];
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$options['nextcloud']['allow_local_address'] = $this->isLocalAddressAllowed($options);
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if ($options['nextcloud']['allow_local_address'] === false) {
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$onRedirectFunction = function (
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\Psr\Http\Message\RequestInterface $request,
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\Psr\Http\Message\ResponseInterface $response,
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\Psr\Http\Message\UriInterface $uri
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) use ($options) {
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$this->preventLocalAddress($uri->__toString(), $options);
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};
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$defaults[RequestOptions::ALLOW_REDIRECTS] = [
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'on_redirect' => $onRedirectFunction
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];
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}
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// Only add RequestOptions::PROXY if Nextcloud is explicitly
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// configured to use a proxy. This is needed in order not to override
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// Guzzle default values.
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if ($proxy !== null) {
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$defaults[RequestOptions::PROXY] = $proxy;
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}
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$options = array_merge($defaults, $options);
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if (!isset($options[RequestOptions::HEADERS]['User-Agent'])) {
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$options[RequestOptions::HEADERS]['User-Agent'] = 'Nextcloud Server Crawler';
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}
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if (!isset($options[RequestOptions::HEADERS]['Accept-Encoding'])) {
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$options[RequestOptions::HEADERS]['Accept-Encoding'] = 'gzip';
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}
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// Fallback for save_to
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if (isset($options['save_to'])) {
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$options['sink'] = $options['save_to'];
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unset($options['save_to']);
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}
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return $options;
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}
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private function getCertBundle(): string {
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// If the instance is not yet setup we need to use the static path as
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// $this->certificateManager->getAbsoluteBundlePath() tries to instantiate
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// a view
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if ($this->config->getSystemValue('installed', false) === false) {
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return \OC::$SERVERROOT . '/resources/config/ca-bundle.crt';
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}
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return $this->certificateManager->getAbsoluteBundlePath();
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}
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/**
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* Returns a null or an associative array specifiying the proxy URI for
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* 'http' and 'https' schemes, in addition to a 'no' key value pair
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* providing a list of host names that should not be proxied to.
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*
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* @return array|null
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*
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* The return array looks like:
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* [
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* 'http' => 'username:password@proxy.example.com',
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* 'https' => 'username:password@proxy.example.com',
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* 'no' => ['foo.com', 'bar.com']
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* ]
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*
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*/
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private function getProxyUri(): ?array {
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$proxyHost = $this->config->getSystemValue('proxy', '');
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if ($proxyHost === '' || $proxyHost === null) {
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return null;
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}
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$proxyUserPwd = $this->config->getSystemValue('proxyuserpwd', '');
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if ($proxyUserPwd !== '' && $proxyUserPwd !== null) {
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$proxyHost = $proxyUserPwd . '@' . $proxyHost;
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}
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$proxy = [
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'http' => $proxyHost,
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'https' => $proxyHost,
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];
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$proxyExclude = $this->config->getSystemValue('proxyexclude', []);
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if ($proxyExclude !== [] && $proxyExclude !== null) {
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$proxy['no'] = $proxyExclude;
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}
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return $proxy;
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}
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private function isLocalAddressAllowed(array $options) : bool {
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if (($options['nextcloud']['allow_local_address'] ?? false) ||
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$this->config->getSystemValueBool('allow_local_remote_servers', false)) {
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return true;
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}
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return false;
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}
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protected function preventLocalAddress(string $uri, array $options): void {
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if ($this->isLocalAddressAllowed($options)) {
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return;
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}
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$this->localAddressChecker->ThrowIfLocalAddress($uri);
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}
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/**
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* Sends a GET request
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*
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* @param string $uri
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* @param array $options Array such as
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* 'query' => [
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* 'field' => 'abc',
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* 'other_field' => '123',
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* 'file_name' => fopen('/path/to/file', 'r'),
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* ],
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* 'headers' => [
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* 'foo' => 'bar',
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* ],
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* 'cookies' => ['
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* 'foo' => 'bar',
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* ],
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* 'allow_redirects' => [
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* 'max' => 10, // allow at most 10 redirects.
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* 'strict' => true, // use "strict" RFC compliant redirects.
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* 'referer' => true, // add a Referer header
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* 'protocols' => ['https'] // only allow https URLs
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* ],
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* 'sink' => '/path/to/file', // save to a file or a stream
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* 'verify' => true, // bool or string to CA file
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* 'debug' => true,
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* 'timeout' => 5,
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* @return IResponse
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* @throws \Exception If the request could not get completed
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*/
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public function get(string $uri, array $options = []): IResponse {
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$this->preventLocalAddress($uri, $options);
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$response = $this->client->request('get', $uri, $this->buildRequestOptions($options));
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$isStream = isset($options['stream']) && $options['stream'];
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return new Response($response, $isStream);
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}
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/**
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* Sends a HEAD request
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*
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* @param string $uri
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* @param array $options Array such as
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* 'headers' => [
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* 'foo' => 'bar',
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* ],
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* 'cookies' => ['
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* 'foo' => 'bar',
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* ],
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* 'allow_redirects' => [
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* 'max' => 10, // allow at most 10 redirects.
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* 'strict' => true, // use "strict" RFC compliant redirects.
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* 'referer' => true, // add a Referer header
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* 'protocols' => ['https'] // only allow https URLs
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* ],
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* 'sink' => '/path/to/file', // save to a file or a stream
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* 'verify' => true, // bool or string to CA file
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* 'debug' => true,
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* 'timeout' => 5,
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* @return IResponse
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* @throws \Exception If the request could not get completed
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*/
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public function head(string $uri, array $options = []): IResponse {
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$this->preventLocalAddress($uri, $options);
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$response = $this->client->request('head', $uri, $this->buildRequestOptions($options));
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return new Response($response);
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}
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/**
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* Sends a POST request
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*
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* @param string $uri
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* @param array $options Array such as
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* 'body' => [
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* 'field' => 'abc',
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* 'other_field' => '123',
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* 'file_name' => fopen('/path/to/file', 'r'),
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* ],
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* 'headers' => [
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* 'foo' => 'bar',
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* ],
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* 'cookies' => ['
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* 'foo' => 'bar',
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* ],
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* 'allow_redirects' => [
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* 'max' => 10, // allow at most 10 redirects.
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* 'strict' => true, // use "strict" RFC compliant redirects.
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* 'referer' => true, // add a Referer header
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* 'protocols' => ['https'] // only allow https URLs
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* ],
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* 'sink' => '/path/to/file', // save to a file or a stream
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* 'verify' => true, // bool or string to CA file
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* 'debug' => true,
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* 'timeout' => 5,
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* @return IResponse
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* @throws \Exception If the request could not get completed
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*/
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public function post(string $uri, array $options = []): IResponse {
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$this->preventLocalAddress($uri, $options);
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if (isset($options['body']) && is_array($options['body'])) {
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$options['form_params'] = $options['body'];
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unset($options['body']);
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}
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$response = $this->client->request('post', $uri, $this->buildRequestOptions($options));
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return new Response($response);
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}
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/**
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* Sends a PUT request
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*
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* @param string $uri
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* @param array $options Array such as
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* 'body' => [
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* 'field' => 'abc',
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* 'other_field' => '123',
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* 'file_name' => fopen('/path/to/file', 'r'),
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* ],
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* 'headers' => [
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* 'foo' => 'bar',
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* ],
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* 'cookies' => ['
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* 'foo' => 'bar',
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* ],
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* 'allow_redirects' => [
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* 'max' => 10, // allow at most 10 redirects.
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* 'strict' => true, // use "strict" RFC compliant redirects.
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* 'referer' => true, // add a Referer header
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* 'protocols' => ['https'] // only allow https URLs
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* ],
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* 'sink' => '/path/to/file', // save to a file or a stream
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* 'verify' => true, // bool or string to CA file
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* 'debug' => true,
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* 'timeout' => 5,
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* @return IResponse
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* @throws \Exception If the request could not get completed
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*/
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public function put(string $uri, array $options = []): IResponse {
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$this->preventLocalAddress($uri, $options);
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$response = $this->client->request('put', $uri, $this->buildRequestOptions($options));
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return new Response($response);
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}
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/**
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* Sends a DELETE request
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*
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* @param string $uri
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* @param array $options Array such as
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* 'body' => [
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* 'field' => 'abc',
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* 'other_field' => '123',
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* 'file_name' => fopen('/path/to/file', 'r'),
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* ],
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* 'headers' => [
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* 'foo' => 'bar',
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* ],
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* 'cookies' => ['
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* 'foo' => 'bar',
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* ],
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* 'allow_redirects' => [
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* 'max' => 10, // allow at most 10 redirects.
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* 'strict' => true, // use "strict" RFC compliant redirects.
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* 'referer' => true, // add a Referer header
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* 'protocols' => ['https'] // only allow https URLs
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* ],
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* 'sink' => '/path/to/file', // save to a file or a stream
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* 'verify' => true, // bool or string to CA file
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* 'debug' => true,
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* 'timeout' => 5,
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* @return IResponse
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* @throws \Exception If the request could not get completed
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*/
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public function delete(string $uri, array $options = []): IResponse {
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$this->preventLocalAddress($uri, $options);
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$response = $this->client->request('delete', $uri, $this->buildRequestOptions($options));
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return new Response($response);
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}
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/**
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* Sends a options request
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*
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* @param string $uri
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* @param array $options Array such as
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* 'body' => [
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* 'field' => 'abc',
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* 'other_field' => '123',
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* 'file_name' => fopen('/path/to/file', 'r'),
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* ],
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* 'headers' => [
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* 'foo' => 'bar',
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* ],
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* 'cookies' => ['
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* 'foo' => 'bar',
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* ],
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* 'allow_redirects' => [
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* 'max' => 10, // allow at most 10 redirects.
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* 'strict' => true, // use "strict" RFC compliant redirects.
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* 'referer' => true, // add a Referer header
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* 'protocols' => ['https'] // only allow https URLs
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* ],
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* 'sink' => '/path/to/file', // save to a file or a stream
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* 'verify' => true, // bool or string to CA file
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* 'debug' => true,
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* 'timeout' => 5,
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* @return IResponse
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* @throws \Exception If the request could not get completed
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*/
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public function options(string $uri, array $options = []): IResponse {
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$this->preventLocalAddress($uri, $options);
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$response = $this->client->request('options', $uri, $this->buildRequestOptions($options));
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return new Response($response);
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}
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}
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