| /* |
| * Copyright (C) 2019 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "FeaturePolicy.h" |
| |
| #include "DOMWindow.h" |
| #include "Document.h" |
| #include "HTMLIFrameElement.h" |
| #include "HTMLNames.h" |
| #include "HTMLParserIdioms.h" |
| #include "SecurityOrigin.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| static const char* policyTypeName(FeaturePolicy::Type type) |
| { |
| switch (type) { |
| case FeaturePolicy::Type::Camera: |
| return "Camera"; |
| case FeaturePolicy::Type::Microphone: |
| return "Microphone"; |
| case FeaturePolicy::Type::DisplayCapture: |
| return "DisplayCapture"; |
| case FeaturePolicy::Type::SyncXHR: |
| return "SyncXHR"; |
| case FeaturePolicy::Type::Fullscreen: |
| return "Fullscreen"; |
| } |
| ASSERT_NOT_REACHED(); |
| return ""; |
| } |
| |
| bool isFeaturePolicyAllowedByDocumentAndAllOwners(FeaturePolicy::Type type, const Document& document, LogFeaturePolicyFailure logFailure) |
| { |
| auto& topDocument = document.topDocument(); |
| auto* ancestorDocument = &document; |
| while (ancestorDocument != &topDocument) { |
| if (!ancestorDocument) { |
| if (logFailure == LogFeaturePolicyFailure::Yes && document.domWindow()) |
| document.domWindow()->printErrorMessage(makeString("Feature policy '", policyTypeName(type), "' check failed.")); |
| return false; |
| } |
| |
| auto* ownerElement = ancestorDocument->ownerElement(); |
| if (is<HTMLIFrameElement>(ownerElement)) { |
| const auto& featurePolicy = downcast<HTMLIFrameElement>(ownerElement)->featurePolicy(); |
| if (!featurePolicy.allows(type, ancestorDocument->securityOrigin().data())) { |
| if (logFailure == LogFeaturePolicyFailure::Yes && document.domWindow()) { |
| auto& allowValue = downcast<HTMLIFrameElement>(ownerElement)->attributeWithoutSynchronization(HTMLNames::allowAttr); |
| document.domWindow()->printErrorMessage(makeString("Feature policy '", policyTypeName(type), "' check failed for iframe with origin '", document.securityOrigin().toString(), "' and allow attribute '", allowValue, "'.")); |
| } |
| return false; |
| } |
| } |
| |
| ancestorDocument = ancestorDocument->parentDocument(); |
| } |
| |
| return true; |
| } |
| |
| static bool isAllowedByFeaturePolicy(const FeaturePolicy::AllowRule& rule, const SecurityOriginData& origin) |
| { |
| switch (rule.type) { |
| case FeaturePolicy::AllowRule::Type::None: |
| return false; |
| case FeaturePolicy::AllowRule::Type::All: |
| return true; |
| case FeaturePolicy::AllowRule::Type::List: |
| return rule.allowedList.contains(origin); |
| } |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| static inline void processOriginItem(Document& document, FeaturePolicy::AllowRule& rule, StringView item) |
| { |
| if (rule.type == FeaturePolicy::AllowRule::Type::None) |
| return; |
| |
| item = item.stripLeadingAndTrailingMatchedCharacters(isHTMLSpace<UChar>); |
| // FIXME: Support 'src'. |
| if (item == "'src'") |
| return; |
| |
| if (item == "*") { |
| rule.type = FeaturePolicy::AllowRule::Type::All; |
| return; |
| } |
| |
| if (item == "'self'") { |
| rule.allowedList.add(document.securityOrigin().data()); |
| return; |
| } |
| if (item == "'none'") { |
| rule.type = FeaturePolicy::AllowRule::Type::None; |
| return; |
| } |
| URL url { { }, item.toString() }; |
| if (url.isValid()) |
| rule.allowedList.add(SecurityOriginData::fromURL(url)); |
| } |
| |
| static inline void updateList(Document& document, FeaturePolicy::AllowRule& rule, StringView value) |
| { |
| // We keep the empty string value equivalent to '*' for existing websites. |
| if (value.isEmpty()) { |
| rule.type = FeaturePolicy::AllowRule::Type::All; |
| return; |
| } |
| |
| while (!value.isEmpty()) { |
| auto position = value.find(isHTMLSpace<UChar>); |
| if (position == notFound) { |
| processOriginItem(document, rule, value); |
| return; |
| } |
| |
| processOriginItem(document, rule, value.substring(0, position)); |
| value = value.substring(position + 1).stripLeadingAndTrailingMatchedCharacters(isHTMLSpace<UChar>); |
| } |
| } |
| |
| FeaturePolicy FeaturePolicy::parse(Document& document, const HTMLIFrameElement& iframe, StringView allowAttributeValue) |
| { |
| FeaturePolicy policy; |
| bool isCameraInitialized = false; |
| bool isMicrophoneInitialized = false; |
| bool isDisplayCaptureInitialized = false; |
| bool isSyncXHRInitialized = false; |
| bool isFullscreenInitialized = false; |
| for (auto allowItem : allowAttributeValue.split(';')) { |
| auto item = allowItem.stripLeadingAndTrailingMatchedCharacters(isHTMLSpace<UChar>); |
| if (item.startsWith("camera")) { |
| isCameraInitialized = true; |
| updateList(document, policy.m_cameraRule, item.substring(7)); |
| continue; |
| } |
| if (item.startsWith("microphone")) { |
| isMicrophoneInitialized = true; |
| updateList(document, policy.m_microphoneRule, item.substring(11)); |
| continue; |
| } |
| if (item.startsWith("display-capture")) { |
| isDisplayCaptureInitialized = true; |
| updateList(document, policy.m_displayCaptureRule, item.substring(16)); |
| continue; |
| } |
| if (item.startsWith("sync-xhr")) { |
| isSyncXHRInitialized = true; |
| updateList(document, policy.m_syncXHRRule, item.substring(8)); |
| continue; |
| } |
| if (item.startsWith("fullscreen")) { |
| isFullscreenInitialized = true; |
| updateList(document, policy.m_fullscreenRule, item.substring(11)); |
| continue; |
| } |
| } |
| |
| // By default, camera, microphone, display-capture, and fullscreen policy is 'self' |
| if (!isCameraInitialized) |
| policy.m_cameraRule.allowedList.add(document.securityOrigin().data()); |
| if (!isMicrophoneInitialized) |
| policy.m_microphoneRule.allowedList.add(document.securityOrigin().data()); |
| if (!isDisplayCaptureInitialized) |
| policy.m_displayCaptureRule.allowedList.add(document.securityOrigin().data()); |
| |
| // https://w3c.github.io/webappsec-feature-policy/#process-feature-policy-attributes |
| // 9.5 Process Feature Policy Attributes |
| // 3.1 If element’s allowfullscreen attribute is specified, and container policy does |
| // not contain an allowlist for fullscreen, |
| if (!isFullscreenInitialized) { |
| if (iframe.hasAttribute(allowfullscreenAttr) || iframe.hasAttribute(webkitallowfullscreenAttr)) { |
| // 3.1.1 Construct a new declaration for fullscreen, whose allowlist is the special value *. |
| policy.m_fullscreenRule.type = FeaturePolicy::AllowRule::Type::All; |
| } else { |
| // https://fullscreen.spec.whatwg.org/#feature-policy-integration |
| // The default allowlist is 'self'. |
| policy.m_fullscreenRule.allowedList.add(document.securityOrigin().data()); |
| } |
| } |
| |
| if (!isSyncXHRInitialized) |
| policy.m_syncXHRRule.type = AllowRule::Type::All; |
| |
| return policy; |
| } |
| |
| bool FeaturePolicy::allows(Type type, const SecurityOriginData& origin) const |
| { |
| switch (type) { |
| case Type::Camera: |
| return isAllowedByFeaturePolicy(m_cameraRule, origin); |
| case Type::Microphone: |
| return isAllowedByFeaturePolicy(m_microphoneRule, origin); |
| case Type::DisplayCapture: |
| return isAllowedByFeaturePolicy(m_displayCaptureRule, origin); |
| case Type::SyncXHR: |
| return isAllowedByFeaturePolicy(m_syncXHRRule, origin); |
| case Type::Fullscreen: |
| return isAllowedByFeaturePolicy(m_fullscreenRule, origin); |
| } |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| } |
