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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
* Copyright (C) 2013-2025 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "MixedContentChecker.h"
#include "Document.h"
#include "FrameLoader.h"
#include "LegacySchemeRegistry.h"
#include "LocalFrameInlines.h"
#include "LocalFrameLoaderClient.h"
#include "SecurityOrigin.h"
namespace WebCore {
static bool isDocumentSecure(const Frame& frame)
{
// FIXME: Use document.isDocumentSecure(), instead of comparing against "https" scheme, when all ports stop using loopback in LayoutTests
// sandboxed iframes have an opaque origin so we should perform the mixed content check considering the origin
// the iframe would have had if it were not sandboxed.
if (RefPtr origin = frame.frameDocumentSecurityOrigin())
return origin->protocol() == "https"_s || (origin->isOpaque() && frame.frameURLProtocol() == "https"_s);
return false;
}
static bool isDataContextSecure(const Frame& frame)
{
RefPtr currentFrame = frame;
while (currentFrame) {
RefPtr localFrame = dynamicDowncast<const LocalFrame>(currentFrame);
RefPtr<Document> document;
if (localFrame)
document = localFrame->document();
if (isDocumentSecure(*currentFrame))
return true;
RefPtr parentFrame = currentFrame->tree().parent();
if (!parentFrame && localFrame)
parentFrame = localFrame->loader().client().provisionalParentFrame();
currentFrame = parentFrame;
}
return false;
}
static bool isMixedContent(const Frame& frame, const URL& url)
{
if (isDocumentSecure(frame) || (frame.frameURLProtocol() == "data"_s && isDataContextSecure(frame)))
return !SecurityOrigin::isSecure(url);
return false;
}
static bool destinationIsImageAudioOrVideo(FetchOptions::Destination destination)
{
return destination == FetchOptions::Destination::Audio || destination == FetchOptions::Destination::Image || destination == FetchOptions::Destination::Video;
}
static bool destinationIsImageAndInitiatorIsImageset(FetchOptions::Destination destination, Initiator initiator)
{
return destination == FetchOptions::Destination::Image && initiator == Initiator::Imageset;
}
bool MixedContentChecker::shouldUpgradeInsecureContent(LocalFrame& frame, IsUpgradable isUpgradable, const URL& url, FetchOptions::Destination destination, Initiator initiator)
{
RefPtr document = frame.document();
if (!document || isUpgradable != IsUpgradable::Yes)
return false;
// https://www.w3.org/TR/mixed-content/#upgrade-algorithm
// Editor’s Draft, 23 February 2023
// 4.1. Upgrade a mixed content request to a potentially trustworthy URL, if appropriate
if (!isMixedContent(frame, url))
return false;
// 4.1 The request's URL is not upgraded in the following cases.
if (!canModifyRequest(url, destination, initiator))
return false;
frame.reportMixedContentViolation(false, url);
return true;
}
bool MixedContentChecker::canModifyRequest(const URL& url, FetchOptions::Destination destination, Initiator initiator)
{
// 4.1.1 request’s URL is a potentially trustworthy URL.
if (url.protocolIs("https"_s))
return false;
// 4.1.2 request’s URL’s host is an IP address.
if (URL::hostIsIPAddress(url.host()) && !shouldTreatAsPotentiallyTrustworthy(url))
return false;
// 4.1.4 request’s destination is not "image", "audio", or "video".
if (!destinationIsImageAudioOrVideo(destination))
return false;
// 4.1.5 request’s destination is "image" and request’s initiator is "imageset".
auto schemeIsHandledBySchemeHandler = LegacySchemeRegistry::schemeIsHandledBySchemeHandler(url.protocol());
if (!schemeIsHandledBySchemeHandler && destinationIsImageAndInitiatorIsImageset(destination, initiator))
return false;
return true;
}
bool MixedContentChecker::shouldBlockRequest(Frame& frame, const URL& url, IsUpgradable isUpgradable)
{
RefPtr<Document> document;
if (RefPtr localFrame = dynamicDowncast<LocalFrame>(frame))
document = localFrame->document();
if (!isMixedContent(frame, url))
return false;
if ((LegacySchemeRegistry::schemeIsHandledBySchemeHandler(url.protocol()) || shouldTreatAsPotentiallyTrustworthy(url)) && isUpgradable == IsUpgradable::Yes)
return false;
frame.reportMixedContentViolation(true, url);
return true;
}
} // namespace WebCore
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