| /* |
| * 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 "Document.h" |
| #include "HTMLParserIdioms.h" |
| #include "SecurityOrigin.h" |
| |
| namespace WebCore { |
| |
| 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, StringView allowAttributeValue) |
| { |
| FeaturePolicy policy; |
| bool isCameraInitialized = false; |
| bool isMicrophoneInitialized = false; |
| bool isDisplayCaptureInitialized = false; |
| bool isSyncXHRInitialized = 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; |
| } |
| } |
| |
| // By default, camera, microphone and display-capture 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()); |
| |
| 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); |
| } |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| } |