adfd1e63f6
As per https://twitter.com/we1x/status/842032709543333890 a nice security hardening Signed-off-by: Lukas Reschke <lukas@statuscode.ch>
411 lines
11 KiB
PHP
411 lines
11 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Lukas Reschke <lukas@statuscode.ch>
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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 OCP\AppFramework\Http;
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use OCP\AppFramework\Http;
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/**
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* Class EmptyContentSecurityPolicy is a simple helper which allows applications
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* to modify the Content-Security-Policy sent by ownCloud. Per default the policy
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* is forbidding everything.
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*
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* As alternative with sane exemptions look at ContentSecurityPolicy
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*
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* @see \OCP\AppFramework\Http\ContentSecurityPolicy
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* @package OCP\AppFramework\Http
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* @since 9.0.0
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*/
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class EmptyContentSecurityPolicy {
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/** @var bool Whether inline JS snippets are allowed */
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protected $inlineScriptAllowed = null;
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/** @var string Whether JS nonces should be used */
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protected $useJsNonce = null;
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/**
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* @var bool Whether eval in JS scripts is allowed
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* TODO: Disallow per default
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* @link https://github.com/owncloud/core/issues/11925
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*/
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protected $evalScriptAllowed = null;
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/** @var array Domains from which scripts can get loaded */
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protected $allowedScriptDomains = null;
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/**
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* @var bool Whether inline CSS is allowed
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* TODO: Disallow per default
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* @link https://github.com/owncloud/core/issues/13458
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*/
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protected $inlineStyleAllowed = null;
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/** @var array Domains from which CSS can get loaded */
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protected $allowedStyleDomains = null;
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/** @var array Domains from which images can get loaded */
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protected $allowedImageDomains = null;
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/** @var array Domains to which connections can be done */
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protected $allowedConnectDomains = null;
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/** @var array Domains from which media elements can be loaded */
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protected $allowedMediaDomains = null;
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/** @var array Domains from which object elements can be loaded */
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protected $allowedObjectDomains = null;
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/** @var array Domains from which iframes can be loaded */
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protected $allowedFrameDomains = null;
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/** @var array Domains from which fonts can be loaded */
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protected $allowedFontDomains = null;
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/** @var array Domains from which web-workers and nested browsing content can load elements */
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protected $allowedChildSrcDomains = null;
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/**
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* Whether inline JavaScript snippets are allowed or forbidden
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* @param bool $state
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* @return $this
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* @since 8.1.0
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* @deprecated 10.0 CSP tokens are now used
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*/
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public function allowInlineScript($state = false) {
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$this->inlineScriptAllowed = $state;
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return $this;
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}
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/**
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* Use the according JS nonce
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*
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* @param string $nonce
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* @return $this
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* @since 11.0.0
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*/
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public function useJsNonce($nonce) {
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$this->useJsNonce = $nonce;
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return $this;
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}
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/**
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* Whether eval in JavaScript is allowed or forbidden
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* @param bool $state
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* @return $this
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* @since 8.1.0
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*/
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public function allowEvalScript($state = true) {
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$this->evalScriptAllowed = $state;
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return $this;
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}
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/**
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* Allows to execute JavaScript files from a specific domain. Use * to
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* allow JavaScript from all domains.
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedScriptDomain($domain) {
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$this->allowedScriptDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed script domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowScriptDomain($domain) {
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$this->allowedScriptDomains = array_diff($this->allowedScriptDomains, [$domain]);
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return $this;
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}
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/**
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* Whether inline CSS snippets are allowed or forbidden
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* @param bool $state
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* @return $this
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* @since 8.1.0
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*/
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public function allowInlineStyle($state = true) {
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$this->inlineStyleAllowed = $state;
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return $this;
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}
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/**
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* Allows to execute CSS files from a specific domain. Use * to allow
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* CSS from all domains.
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedStyleDomain($domain) {
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$this->allowedStyleDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed style domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowStyleDomain($domain) {
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$this->allowedStyleDomains = array_diff($this->allowedStyleDomains, [$domain]);
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return $this;
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}
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/**
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* Allows using fonts from a specific domain. Use * to allow
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* fonts from all domains.
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedFontDomain($domain) {
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$this->allowedFontDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed font domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowFontDomain($domain) {
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$this->allowedFontDomains = array_diff($this->allowedFontDomains, [$domain]);
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return $this;
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}
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/**
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* Allows embedding images from a specific domain. Use * to allow
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* images from all domains.
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedImageDomain($domain) {
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$this->allowedImageDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed image domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowImageDomain($domain) {
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$this->allowedImageDomains = array_diff($this->allowedImageDomains, [$domain]);
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return $this;
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}
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/**
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* To which remote domains the JS connect to.
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedConnectDomain($domain) {
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$this->allowedConnectDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed connect domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowConnectDomain($domain) {
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$this->allowedConnectDomains = array_diff($this->allowedConnectDomains, [$domain]);
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return $this;
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}
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/**
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* From which domains media elements can be embedded.
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedMediaDomain($domain) {
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$this->allowedMediaDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed media domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowMediaDomain($domain) {
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$this->allowedMediaDomains = array_diff($this->allowedMediaDomains, [$domain]);
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return $this;
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}
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/**
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* From which domains objects such as <object>, <embed> or <applet> are executed
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedObjectDomain($domain) {
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$this->allowedObjectDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed object domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowObjectDomain($domain) {
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$this->allowedObjectDomains = array_diff($this->allowedObjectDomains, [$domain]);
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return $this;
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}
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/**
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* Which domains can be embedded in an iframe
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedFrameDomain($domain) {
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$this->allowedFrameDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed frame domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowFrameDomain($domain) {
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$this->allowedFrameDomains = array_diff($this->allowedFrameDomains, [$domain]);
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return $this;
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}
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/**
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* Domains from which web-workers and nested browsing content can load elements
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* @param string $domain Domain to whitelist. Any passed value needs to be properly sanitized.
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* @return $this
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* @since 8.1.0
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*/
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public function addAllowedChildSrcDomain($domain) {
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$this->allowedChildSrcDomains[] = $domain;
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return $this;
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}
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/**
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* Remove the specified allowed child src domain from the allowed domains.
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*
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* @param string $domain
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* @return $this
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* @since 8.1.0
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*/
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public function disallowChildSrcDomain($domain) {
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$this->allowedChildSrcDomains = array_diff($this->allowedChildSrcDomains, [$domain]);
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return $this;
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}
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/**
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* Get the generated Content-Security-Policy as a string
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* @return string
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* @since 8.1.0
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*/
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public function buildPolicy() {
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$policy = "default-src 'none';";
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$policy .= "base-uri 'none';";
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if(!empty($this->allowedScriptDomains) || $this->inlineScriptAllowed || $this->evalScriptAllowed) {
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$policy .= 'script-src ';
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if(is_string($this->useJsNonce)) {
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$policy .= '\'nonce-'.base64_encode($this->useJsNonce).'\'';
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$allowedScriptDomains = array_flip($this->allowedScriptDomains);
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unset($allowedScriptDomains['\'self\'']);
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$this->allowedScriptDomains = array_flip($allowedScriptDomains);
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if(count($allowedScriptDomains) !== 0) {
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$policy .= ' ';
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}
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}
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if(is_array($this->allowedScriptDomains)) {
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$policy .= implode(' ', $this->allowedScriptDomains);
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}
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if($this->inlineScriptAllowed) {
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$policy .= ' \'unsafe-inline\'';
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}
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if($this->evalScriptAllowed) {
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$policy .= ' \'unsafe-eval\'';
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}
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$policy .= ';';
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}
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if(!empty($this->allowedStyleDomains) || $this->inlineStyleAllowed) {
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$policy .= 'style-src ';
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if(is_array($this->allowedStyleDomains)) {
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$policy .= implode(' ', $this->allowedStyleDomains);
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}
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if($this->inlineStyleAllowed) {
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$policy .= ' \'unsafe-inline\'';
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}
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$policy .= ';';
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}
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if(!empty($this->allowedImageDomains)) {
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$policy .= 'img-src ' . implode(' ', $this->allowedImageDomains);
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$policy .= ';';
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}
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if(!empty($this->allowedFontDomains)) {
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$policy .= 'font-src ' . implode(' ', $this->allowedFontDomains);
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$policy .= ';';
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}
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if(!empty($this->allowedConnectDomains)) {
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$policy .= 'connect-src ' . implode(' ', $this->allowedConnectDomains);
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$policy .= ';';
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}
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if(!empty($this->allowedMediaDomains)) {
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$policy .= 'media-src ' . implode(' ', $this->allowedMediaDomains);
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$policy .= ';';
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}
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if(!empty($this->allowedObjectDomains)) {
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$policy .= 'object-src ' . implode(' ', $this->allowedObjectDomains);
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$policy .= ';';
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}
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if(!empty($this->allowedFrameDomains)) {
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$policy .= 'frame-src ' . implode(' ', $this->allowedFrameDomains);
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$policy .= ';';
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}
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if(!empty($this->allowedChildSrcDomains)) {
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$policy .= 'child-src ' . implode(' ', $this->allowedChildSrcDomains);
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$policy .= ';';
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}
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return rtrim($policy, ';');
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}
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}
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