mirror of
https://github.com/nextcloud/server.git
synced 2024-11-14 20:36:50 +00:00
550 lines
15 KiB
PHP
550 lines
15 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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namespace 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 Nexcloud. 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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* @since 9.0.0
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*/
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class EmptyContentSecurityPolicy {
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/** @var ?string JS nonce to be used */
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protected ?string $jsNonce = null;
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/** @var bool Whether strict-dynamic should be used */
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protected $strictDynamicAllowed = null;
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/** @var bool Whether strict-dynamic should be used on script-src-elem */
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protected $strictDynamicAllowedOnScripts = 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 bool Whether WebAssembly compilation is allowed */
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protected ?bool $evalWasmAllowed = 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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/** @var array Domains which can embed this Nextcloud instance */
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protected $allowedFrameAncestors = null;
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/** @var array Domains from which web-workers can be loaded */
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protected $allowedWorkerSrcDomains = null;
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/** @var array Domains which can be used as target for forms */
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protected $allowedFormActionDomains = null;
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/** @var array Locations to report violations to */
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protected $reportTo = null;
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/**
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* @param bool $state
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* @return EmptyContentSecurityPolicy
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* @since 24.0.0
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*/
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public function useStrictDynamic(bool $state = false): self {
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$this->strictDynamicAllowed = $state;
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return $this;
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}
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/**
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* In contrast to `useStrictDynamic` this only sets strict-dynamic on script-src-elem
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* Meaning only grants trust to all imports of scripts that were loaded in `<script>` tags, and thus weakens less the CSP.
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* @param bool $state
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* @return EmptyContentSecurityPolicy
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* @since 28.0.0
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*/
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public function useStrictDynamicOnScripts(bool $state = false): self {
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$this->strictDynamicAllowedOnScripts = $state;
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return $this;
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}
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/**
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* The base64 encoded nonce to be used for script source.
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* This method is only for CSPMiddleware, custom values are ignored in mergePolicies of ContentSecurityPolicyManager
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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->jsNonce = $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 $this
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* @since 8.1.0
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* @deprecated 17.0.0 Eval should not be used anymore. Please update your scripts. This function will stop functioning in a future version of Nextcloud.
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*/
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public function allowEvalScript($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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* Whether WebAssembly compilation is allowed or forbidden
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* @param bool $state
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* @return $this
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* @since 28.0.0
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*/
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public function allowEvalWasm(bool $state = true) {
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$this->evalWasmAllowed = $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 $this
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* @since 8.1.0
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* @deprecated 15.0.0 use addAllowedWorkerSrcDomains or addAllowedFrameDomain
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*/
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public function addAllowedChildSrcDomain($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 $this
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* @since 8.1.0
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* @deprecated 15.0.0 use the WorkerSrcDomains or FrameDomain
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*/
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public function disallowChildSrcDomain($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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* Domains which can embed an iFrame of the Nextcloud instance
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*
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* @param string $domain
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* @return $this
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* @since 13.0.0
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*/
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public function addAllowedFrameAncestorDomain($domain) {
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$this->allowedFrameAncestors[] = $domain;
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return $this;
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}
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/**
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* Domains which can embed an iFrame of the Nextcloud instance
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*
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* @param string $domain
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* @return $this
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* @since 13.0.0
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*/
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public function disallowFrameAncestorDomain($domain) {
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$this->allowedFrameAncestors = array_diff($this->allowedFrameAncestors, [$domain]);
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return $this;
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}
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/**
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* Domain from which workers can be loaded
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*
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* @param string $domain
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* @return $this
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* @since 15.0.0
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*/
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public function addAllowedWorkerSrcDomain(string $domain) {
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$this->allowedWorkerSrcDomains[] = $domain;
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return $this;
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}
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/**
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* Remove domain from which workers can be loaded
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*
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* @param string $domain
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* @return $this
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* @since 15.0.0
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*/
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public function disallowWorkerSrcDomain(string $domain) {
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$this->allowedWorkerSrcDomains = array_diff($this->allowedWorkerSrcDomains, [$domain]);
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return $this;
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}
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/**
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* Domain to where forms can submit
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*
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* @since 17.0.0
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*
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* @return $this
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*/
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public function addAllowedFormActionDomain(string $domain) {
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$this->allowedFormActionDomains[] = $domain;
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return $this;
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}
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/**
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* Remove domain to where forms can submit
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*
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* @return $this
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* @since 17.0.0
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*/
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public function disallowFormActionDomain(string $domain) {
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$this->allowedFormActionDomains = array_diff($this->allowedFormActionDomains, [$domain]);
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return $this;
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}
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/**
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* Add location to report CSP violations to
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*
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* @param string $location
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* @return $this
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* @since 15.0.0
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*/
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public function addReportTo(string $location) {
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$this->reportTo[] = $location;
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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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$policy .= "base-uri 'none';";
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$policy .= "manifest-src 'self';";
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if (!empty($this->allowedScriptDomains) || $this->evalScriptAllowed || $this->evalWasmAllowed || is_string($this->jsNonce)) {
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$policy .= 'script-src ';
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$scriptSrc = '';
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if (is_string($this->jsNonce)) {
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if ($this->strictDynamicAllowed) {
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$scriptSrc .= '\'strict-dynamic\' ';
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}
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$scriptSrc .= '\'nonce-' . $this->jsNonce . '\'';
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$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($allowedScriptDomains) !== 0) {
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$scriptSrc .= ' ';
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}
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}
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if (is_array($this->allowedScriptDomains)) {
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$scriptSrc .= implode(' ', $this->allowedScriptDomains);
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}
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if ($this->evalScriptAllowed) {
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$scriptSrc .= ' \'unsafe-eval\'';
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}
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if ($this->evalWasmAllowed) {
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$scriptSrc .= ' \'wasm-unsafe-eval\'';
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}
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$policy .= $scriptSrc . ';';
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}
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// We only need to set this if 'strictDynamicAllowed' is not set because otherwise we can simply fall back to script-src
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if ($this->strictDynamicAllowedOnScripts && is_string($this->jsNonce) && !$this->strictDynamicAllowed) {
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$policy .= 'script-src-elem \'strict-dynamic\' ';
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$policy .= $scriptSrc ?? '';
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$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 ';
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$policy .= 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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if (!empty($this->allowedFrameAncestors)) {
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$policy .= 'frame-ancestors ' . implode(' ', $this->allowedFrameAncestors);
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$policy .= ';';
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} else {
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$policy .= 'frame-ancestors \'none\';';
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}
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if (!empty($this->allowedWorkerSrcDomains)) {
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$policy .= 'worker-src ' . implode(' ', $this->allowedWorkerSrcDomains);
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$policy .= ';';
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}
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if (!empty($this->allowedFormActionDomains)) {
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$policy .= 'form-action ' . implode(' ', $this->allowedFormActionDomains);
|
||
$policy .= ';';
|
||
}
|
||
|
||
if (!empty($this->reportTo)) {
|
||
$policy .= 'report-uri ' . implode(' ', $this->reportTo);
|
||
$policy .= ';';
|
||
}
|
||
|
||
return rtrim($policy, ';');
|
||
}
|
||
}
|