2b11d61577
wfGetUrlUtils() is also deprecated, but less so, so we can do this first and then properly replace the individual uses with dependency injection in local pieces of work. Also: * Switching Parser::getExternalLinkRel to UrlUtils::matchesDomainList exposed a type error in media.txt where $wgNoFollowDomainExceptions was set to a string (which is invalid) instead of an array. Bug: T319340 Change-Id: Icb512d7241954ee155b64c57f3782b86acfd9a4c
594 lines
19 KiB
PHP
594 lines
19 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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namespace MediaWiki\Request;
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use MediaWiki\Config\Config;
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use MediaWiki\HookContainer\HookContainer;
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use MediaWiki\HookContainer\HookRunner;
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use MediaWiki\MainConfigNames;
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use MediaWiki\MediaWikiServices;
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use UnexpectedValueException;
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/**
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* Handle sending Content-Security-Policy headers
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*
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* @author Copyright 2015–2018 Brian Wolff
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* @see https://www.w3.org/TR/CSP2/
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* @since 1.32
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*/
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class ContentSecurityPolicy {
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public const REPORT_ONLY_MODE = 1;
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public const FULL_MODE = 2;
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/** @var Config The site configuration object */
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private $mwConfig;
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/** @var WebResponse */
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private $response;
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/** @var string[] */
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private $extraDefaultSrc = [];
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/** @var string[] */
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private $extraScriptSrc = [];
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/** @var string[] */
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private $extraStyleSrc = [];
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/** @var HookRunner */
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private $hookRunner;
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/**
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* @note As a general rule, you would not construct this class directly
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* but use the instance from OutputPage::getCSP()
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* @internal
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* @param WebResponse $response
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* @param Config $mwConfig
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* @param HookContainer $hookContainer
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* @since 1.35 Method signature changed
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*/
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public function __construct(
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WebResponse $response,
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Config $mwConfig,
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HookContainer $hookContainer
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) {
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$this->response = $response;
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$this->mwConfig = $mwConfig;
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$this->hookRunner = new HookRunner( $hookContainer );
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}
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/**
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* Get the CSP directives for the wiki.
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* @return string[] Array of CSP directives (header name => header value). The array keys will be
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* ContentSecurityPolicy::FULL_MODE and ContentSecurityPolicy::REPORT_ONLY_MODE; they might not
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* be present if the wiki is configured no to use the given type of CSP.
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* @phan-return array{Content-Security-Policy?:string,Content-Security-Policy-Report-Only?:string}
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* @since 1.42
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*/
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public function getDirectives() {
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$cspConfig = $this->mwConfig->get( MainConfigNames::CSPHeader );
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$cspConfigReportOnly = $this->mwConfig->get( MainConfigNames::CSPReportOnlyHeader );
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$cspPolicy = $this->makeCSPDirectives( $cspConfig, self::FULL_MODE );
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$cspReportOnlyPolicy = $this->makeCSPDirectives( $cspConfigReportOnly, self::REPORT_ONLY_MODE );
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return array_filter( [
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$this->getHeaderName( self::FULL_MODE ) => $cspPolicy,
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$this->getHeaderName( self::REPORT_ONLY_MODE ) => $cspReportOnlyPolicy,
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] );
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}
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/**
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* Send CSP headers based on wiki config
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*
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* Main method that callers (OutputPage) are expected to use.
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* As a general rule, you would never call this in an extension unless
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* you have disabled OutputPage and are fully controlling the output.
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*
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* @since 1.35
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*/
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public function sendHeaders() {
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$directives = $this->getDirectives();
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foreach ( $directives as $headerName => $policy ) {
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$this->response->header( "$headerName: $policy" );
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}
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// This used to insert a <meta> tag here, per advice at
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// https://blogs.dropbox.com/tech/2015/09/unsafe-inline-and-nonce-deployment/
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// The goal was to prevent nonce from working after the page hit onready,
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// This would help in old browsers that didn't support nonces, and
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// also assist for Varnish-cached pages which repeat nonces.
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// However, this is incompatible with how ResourceLoader runs code
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// from mw.loader.store, so it was removed.
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}
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/**
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* @param int $reportOnly Either self::REPORT_ONLY_MODE or self::FULL_MODE
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* @return string Name of http header
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* @throws UnexpectedValueException
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*/
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private function getHeaderName( $reportOnly ) {
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if ( $reportOnly === self::REPORT_ONLY_MODE ) {
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return 'Content-Security-Policy-Report-Only';
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}
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if ( $reportOnly === self::FULL_MODE ) {
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return 'Content-Security-Policy';
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}
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throw new UnexpectedValueException( "Mode '$reportOnly' not recognised" );
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}
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/**
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* Determine what CSP policies to set for this page
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*
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* @param array|bool $policyConfig Policy configuration
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* (Either $wgCSPHeader or $wgCSPReportOnlyHeader)
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* @param int $mode self::REPORT_ONLY_MODE, self::FULL_MODE
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* @return string Policy directives, or empty string for no policy.
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*/
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private function makeCSPDirectives( $policyConfig, $mode ) {
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if ( $policyConfig === false ) {
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// CSP is disabled
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return '';
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}
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if ( $policyConfig === true ) {
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$policyConfig = [];
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}
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$mwConfig = $this->mwConfig;
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if (
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self::isNonceRequired( $mwConfig ) ||
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self::isNonceRequiredArray( [ $policyConfig ] )
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) {
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wfDeprecated( 'wgCSPHeader "useNonces" option', '1.41' );
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}
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$additionalSelfUrls = $this->getAdditionalSelfUrls();
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$additionalSelfUrlsScript = $this->getAdditionalSelfUrlsScript();
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// If no default-src is sent at all, it seems browsers (or at least some),
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// interpret that as allow anything, but the spec seems to imply that
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// "data:" and "blob:" should be blocked.
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$defaultSrc = [ '*', 'data:', 'blob:' ];
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$imgSrc = false;
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$scriptSrc = [ "'unsafe-eval'", "blob:", "'self'" ];
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$scriptSrc = array_merge( $scriptSrc, $additionalSelfUrlsScript );
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if ( isset( $policyConfig['script-src'] )
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&& is_array( $policyConfig['script-src'] )
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) {
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foreach ( $policyConfig['script-src'] as $src ) {
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$scriptSrc[] = $this->escapeUrlForCSP( $src );
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}
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}
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// Note: default on if unspecified.
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if ( $policyConfig['unsafeFallback'] ?? true ) {
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// unsafe-inline should be ignored on browsers that support 'nonce-foo' sources.
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// Some older versions of firefox don't follow this rule, but new browsers do.
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// (Should be for at least Firefox 40+).
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$scriptSrc[] = "'unsafe-inline'";
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}
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// If default source option set to true or an array of urls,
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// set a restrictive default-src.
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// If set to false, we send a lenient default-src,
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// see the code above where $defaultSrc is set initially.
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if ( isset( $policyConfig['default-src'] )
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&& $policyConfig['default-src'] !== false
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) {
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$defaultSrc = array_merge(
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[ "'self'", 'data:', 'blob:' ],
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$additionalSelfUrls
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);
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if ( is_array( $policyConfig['default-src'] ) ) {
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foreach ( $policyConfig['default-src'] as $src ) {
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$defaultSrc[] = $this->escapeUrlForCSP( $src );
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}
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}
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}
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if ( $policyConfig['includeCORS'] ?? true ) {
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$CORSUrls = $this->getCORSSources();
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if ( !in_array( '*', $defaultSrc ) ) {
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$defaultSrc = array_merge( $defaultSrc, $CORSUrls );
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}
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// Unlikely to have * in scriptSrc, but doesn't
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// hurt to check.
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if ( !in_array( '*', $scriptSrc ) ) {
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$scriptSrc = array_merge( $scriptSrc, $CORSUrls );
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}
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}
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$defaultSrc = array_merge( $defaultSrc, $this->extraDefaultSrc );
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$scriptSrc = array_merge( $scriptSrc, $this->extraScriptSrc );
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$cssSrc = array_merge( $defaultSrc, $this->extraStyleSrc, [ "'unsafe-inline'" ] );
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$this->hookRunner->onContentSecurityPolicyDefaultSource( $defaultSrc, $policyConfig, $mode );
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$this->hookRunner->onContentSecurityPolicyScriptSource( $scriptSrc, $policyConfig, $mode );
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if ( isset( $policyConfig['report-uri'] ) && $policyConfig['report-uri'] !== true ) {
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if ( $policyConfig['report-uri'] === false ) {
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$reportUri = false;
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} else {
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$reportUri = $this->escapeUrlForCSP( $policyConfig['report-uri'] );
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}
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} else {
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$reportUri = $this->getReportUri( $mode );
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}
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// Only send an img-src, if we're sending a restrictive default.
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if ( !is_array( $defaultSrc )
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|| !in_array( '*', $defaultSrc )
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|| !in_array( 'data:', $defaultSrc )
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|| !in_array( 'blob:', $defaultSrc )
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) {
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// A future todo might be to make the allow options only
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// add all the allowed sites to the header, instead of
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// allowing all (Assuming there is a small number of sites).
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// For now, the external image feature disables the limits
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// CSP puts on external images.
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if ( $mwConfig->get( MainConfigNames::AllowExternalImages )
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|| $mwConfig->get( MainConfigNames::AllowExternalImagesFrom )
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) {
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$imgSrc = [ '*', 'data:', 'blob:' ];
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} elseif ( $mwConfig->get( MainConfigNames::EnableImageWhitelist ) ) {
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$whitelist = wfMessage( 'external_image_whitelist' )
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->inContentLanguage()
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->plain();
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if ( preg_match( '/^\s*[^\s#]/m', $whitelist ) ) {
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$imgSrc = [ '*', 'data:', 'blob:' ];
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}
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}
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}
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// Default value 'none'. true is none, false is nothing, string is single directive,
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// array is list.
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if ( !isset( $policyConfig['object-src'] ) || $policyConfig['object-src'] === true ) {
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$objectSrc = [ "'none'" ];
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} else {
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$objectSrc = (array)( $policyConfig['object-src'] ?: [] );
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}
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$objectSrc = array_map( [ $this, 'escapeUrlForCSP' ], $objectSrc );
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$directives = [];
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if ( $scriptSrc ) {
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$directives[] = 'script-src ' . implode( ' ', array_unique( $scriptSrc ) );
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}
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if ( $defaultSrc ) {
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$directives[] = 'default-src ' . implode( ' ', array_unique( $defaultSrc ) );
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}
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if ( $cssSrc ) {
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$directives[] = 'style-src ' . implode( ' ', array_unique( $cssSrc ) );
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}
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if ( $imgSrc ) {
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$directives[] = 'img-src ' . implode( ' ', array_unique( $imgSrc ) );
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}
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if ( $objectSrc ) {
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$directives[] = 'object-src ' . implode( ' ', $objectSrc );
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}
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if ( $reportUri ) {
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$directives[] = 'report-uri ' . $reportUri;
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}
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$this->hookRunner->onContentSecurityPolicyDirectives( $directives, $policyConfig, $mode );
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return implode( '; ', $directives );
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}
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/**
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* Get the default report uri.
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*
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* @param int $mode self::*_MODE constant.
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* @return string The URI to send reports to.
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* @throws UnexpectedValueException if given invalid mode.
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*/
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private function getReportUri( $mode ) {
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$apiArguments = [
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'action' => 'cspreport',
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'format' => 'json'
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];
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if ( $mode === self::REPORT_ONLY_MODE ) {
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$apiArguments['reportonly'] = '1';
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}
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$reportUri = wfAppendQuery( wfScript( 'api' ), $apiArguments );
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// Per spec, ';' and ',' must be hex-escaped in report URI
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$reportUri = $this->escapeUrlForCSP( $reportUri );
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return $reportUri;
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}
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/**
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* Given a url, convert to form needed for CSP.
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*
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* Currently this does either scheme + host, or
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* if protocol relative, just the host. Future versions
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* could potentially preserve some of the path, if its determined
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* that that would be a good idea.
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*
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* @note This does the extra escaping for CSP, but assumes the url
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* has already had normal url escaping applied.
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* @note This discards urls same as server name, as 'self' directive
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* takes care of that.
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* @param string $url
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* @return string|bool Converted url or false on failure
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*/
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private function prepareUrlForCSP( $url ) {
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$result = false;
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if ( preg_match( '/^[a-z][a-z0-9+.-]*:$/i', $url ) ) {
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// A schema source (e.g. blob: or data:)
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return $url;
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}
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$bits = wfGetUrlUtils()->parse( $url );
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if ( !$bits && strpos( $url, '/' ) === false ) {
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// probably something like example.com.
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// try again protocol-relative.
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$url = '//' . $url;
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$bits = wfGetUrlUtils()->parse( $url );
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}
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if ( $bits && isset( $bits['host'] )
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&& $bits['host'] !== $this->mwConfig->get( MainConfigNames::ServerName )
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) {
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$result = $bits['host'];
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if ( $bits['scheme'] !== '' ) {
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$result = $bits['scheme'] . $bits['delimiter'] . $result;
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}
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if ( isset( $bits['port'] ) ) {
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$result .= ':' . $bits['port'];
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}
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$result = $this->escapeUrlForCSP( $result );
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}
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return $result;
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}
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/**
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* @return string[] Additional sources for loading scripts from
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*/
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private function getAdditionalSelfUrlsScript() {
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$additionalUrls = [];
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// wgExtensionAssetsPath for ?debug=true mode
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$pathVars = [
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MainConfigNames::LoadScript,
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MainConfigNames::ExtensionAssetsPath,
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MainConfigNames::ResourceBasePath,
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];
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foreach ( $pathVars as $path ) {
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$url = $this->mwConfig->get( $path );
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$preparedUrl = $this->prepareUrlForCSP( $url );
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if ( $preparedUrl ) {
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$additionalUrls[] = $preparedUrl;
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}
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}
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$RLSources = $this->mwConfig->get( MainConfigNames::ResourceLoaderSources );
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foreach ( $RLSources as $sources ) {
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foreach ( $sources as $value ) {
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$url = $this->prepareUrlForCSP( $value );
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if ( $url ) {
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$additionalUrls[] = $url;
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}
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}
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}
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return array_unique( $additionalUrls );
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}
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/**
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* Get additional host names for the wiki (e.g. if static content loaded elsewhere)
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*
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* @note These are general load sources, not script sources
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* @return string[] Array of other urls for wiki (for use in default-src)
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*/
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private function getAdditionalSelfUrls() {
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// XXX on a foreign repo, the included description page can have anything on it,
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// including inline scripts. But nobody does that.
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// In principle, you can have even more complex configs... (e.g. The urlsByExt option)
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$pathUrls = [];
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$additionalSelfUrls = [];
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// Future todo: The zone urls should never go into
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// style-src. They should either be only in img-src, or if
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// img-src unspecified they should be in default-src. Similarly,
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// the DescriptionStylesheetUrl only needs to be in style-src
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// (or default-src if style-src unspecified).
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$callback = static function ( $repo, &$urls ) {
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$urls[] = $repo->getZoneUrl( 'public' );
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$urls[] = $repo->getZoneUrl( 'transcoded' );
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$urls[] = $repo->getZoneUrl( 'thumb' );
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$urls[] = $repo->getDescriptionStylesheetUrl();
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};
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$repoGroup = MediaWikiServices::getInstance()->getRepoGroup();
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$localRepo = $repoGroup->getRepo( 'local' );
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$callback( $localRepo, $pathUrls );
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$repoGroup->forEachForeignRepo( $callback, [ &$pathUrls ] );
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// Globals that might point to a different domain
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$pathGlobals = [
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MainConfigNames::LoadScript,
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MainConfigNames::ExtensionAssetsPath,
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MainConfigNames::StylePath,
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MainConfigNames::ResourceBasePath,
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];
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foreach ( $pathGlobals as $path ) {
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$pathUrls[] = $this->mwConfig->get( $path );
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}
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foreach ( $pathUrls as $path ) {
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$preparedUrl = $this->prepareUrlForCSP( $path );
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if ( $preparedUrl !== false ) {
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$additionalSelfUrls[] = $preparedUrl;
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}
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}
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$RLSources = $this->mwConfig->get( MainConfigNames::ResourceLoaderSources );
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foreach ( $RLSources as $sources ) {
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foreach ( $sources as $value ) {
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$url = $this->prepareUrlForCSP( $value );
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if ( $url ) {
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$additionalSelfUrls[] = $url;
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}
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}
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}
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return array_unique( $additionalSelfUrls );
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}
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/**
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* include domains that are allowed to send us CORS requests.
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*
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* Technically, $wgCrossSiteAJAXdomains lists things that are allowed to talk to us
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* not things that we are allowed to talk to - but if something is allowed to talk to us,
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* then there is a good chance that we should probably be allowed to talk to it.
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*
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* This is configurable with the 'includeCORS' key in the CSP config, and enabled
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* by default.
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* @note CORS domains with single character ('?') wildcards, are not included.
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* @return array Additional hosts
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*/
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private function getCORSSources() {
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$additionalUrls = [];
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$CORSSources = $this->mwConfig->get( MainConfigNames::CrossSiteAJAXdomains );
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foreach ( $CORSSources as $source ) {
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if ( strpos( $source, '?' ) !== false ) {
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// CSP doesn't support single char wildcard
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continue;
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}
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$url = $this->prepareUrlForCSP( $source );
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if ( $url ) {
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$additionalUrls[] = $url;
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}
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}
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return $additionalUrls;
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}
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/**
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* CSP spec says ',' and ';' are not allowed to appear in urls.
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*
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* @note This assumes that normal escaping has been applied to the url
|
||
* @param string $url URL (or possibly just part of one)
|
||
* @return string
|
||
*/
|
||
private function escapeUrlForCSP( $url ) {
|
||
return str_replace(
|
||
[ ';', ',' ],
|
||
[ '%3B', '%2C' ],
|
||
$url
|
||
);
|
||
}
|
||
|
||
/**
|
||
* Does this browser give false positive reports?
|
||
*
|
||
* Some versions of firefox (40-42) incorrectly report a CSP
|
||
* violation for nonce sources, despite allowing them.
|
||
*
|
||
* @see https://bugzilla.mozilla.org/show_bug.cgi?id=1026520
|
||
* @param string $ua User-agent header
|
||
* @return bool
|
||
*/
|
||
public static function falsePositiveBrowser( $ua ) {
|
||
return (bool)preg_match( '!Firefox/4[0-2]\.!', $ua );
|
||
}
|
||
|
||
/**
|
||
* Should we set nonce attribute
|
||
*
|
||
* @param Config $config
|
||
* @return bool
|
||
*/
|
||
public static function isNonceRequired( Config $config ) {
|
||
$configs = [
|
||
$config->get( MainConfigNames::CSPHeader ),
|
||
$config->get( MainConfigNames::CSPReportOnlyHeader ),
|
||
];
|
||
return self::isNonceRequiredArray( $configs );
|
||
}
|
||
|
||
/**
|
||
* Does a specific config require a nonce
|
||
*
|
||
* @param array $configs An array of CSP config arrays
|
||
* @return bool
|
||
*/
|
||
private static function isNonceRequiredArray( array $configs ) {
|
||
foreach ( $configs as $headerConfig ) {
|
||
if (
|
||
is_array( $headerConfig ) &&
|
||
isset( $headerConfig['useNonces'] ) &&
|
||
$headerConfig['useNonces']
|
||
) {
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* Get the nonce if nonce is in use
|
||
*
|
||
* Not currently supported or implemented.
|
||
*
|
||
* @since 1.35
|
||
* @return false
|
||
*/
|
||
public function getNonce() {
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* If possible you should use a more specific source type then default.
|
||
*
|
||
* So for example, if an extension added a special page that loaded something
|
||
* it might call $this->getOutput()->getCSP()->addDefaultSrc( '*.example.com' );
|
||
*
|
||
* @since 1.35
|
||
* @param string $source Source to add.
|
||
* e.g. blob:, *.example.com, %https://example.com, example.com/foo
|
||
*/
|
||
public function addDefaultSrc( $source ) {
|
||
$this->extraDefaultSrc[] = $this->prepareUrlForCSP( $source );
|
||
}
|
||
|
||
/**
|
||
* So for example, if an extension added a special page that loaded external CSS
|
||
* it might call $this->getOutput()->getCSP()->addStyleSrc( '*.example.com' );
|
||
*
|
||
* @since 1.35
|
||
* @param string $source Source to add.
|
||
* e.g. blob:, *.example.com, %https://example.com, example.com/foo
|
||
*/
|
||
public function addStyleSrc( $source ) {
|
||
$this->extraStyleSrc[] = $this->prepareUrlForCSP( $source );
|
||
}
|
||
|
||
/**
|
||
* So for example, if an extension added a special page that loaded something
|
||
* it might call $this->getOutput()->getCSP()->addScriptSrc( '*.example.com' );
|
||
*
|
||
* @since 1.35
|
||
* @warning Be careful including external scripts, as they can take over accounts.
|
||
* @param string $source Source to add.
|
||
* e.g. blob:, *.example.com, %https://example.com, example.com/foo
|
||
*/
|
||
public function addScriptSrc( $source ) {
|
||
$this->extraScriptSrc[] = $this->prepareUrlForCSP( $source );
|
||
}
|
||
}
|
||
|
||
/** @deprecated class alias since 1.40 */
|
||
class_alias( ContentSecurityPolicy::class, 'ContentSecurityPolicy' );
|