blob: d0805795af21d39fc6858d4ac0168745f011fec4 [file] [log] [blame]
/*
* Copyright (C) 2006-2018 Apple Inc. All rights reserved.
* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
*
* 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 "PolicyChecker.h"
#include "BlobRegistry.h"
#include "BlobURL.h"
#include "ContentFilter.h"
#include "ContentSecurityPolicy.h"
#include "DOMWindow.h"
#include "DocumentLoader.h"
#include "Event.h"
#include "EventNames.h"
#include "FormState.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "HTMLFormElement.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLPlugInElement.h"
#include "Logging.h"
#include "ThreadableBlobRegistry.h"
#include <wtf/CompletionHandler.h>
#if USE(QUICK_LOOK)
#include "QuickLook.h"
#endif
#define PAGE_ID (m_frame.loader().pageID().value_or(PageIdentifier()).toUInt64())
#define FRAME_ID (m_frame.loader().frameID().value_or(FrameIdentifier()).toUInt64())
#define POLICYCHECKER_RELEASE_LOG(fmt, ...) RELEASE_LOG(Loading, "%p - [pageID=%" PRIu64 ", frameID=%" PRIu64 "] PolicyChecker::" fmt, this, PAGE_ID, FRAME_ID, ##__VA_ARGS__)
namespace WebCore {
static bool isAllowedByContentSecurityPolicy(const URL& url, const Element* ownerElement, bool didReceiveRedirectResponse)
{
if (!ownerElement)
return true;
// Elements in user agent show tree should load whatever the embedding document policy is.
if (ownerElement->isInUserAgentShadowTree())
return true;
auto redirectResponseReceived = didReceiveRedirectResponse ? ContentSecurityPolicy::RedirectResponseReceived::Yes : ContentSecurityPolicy::RedirectResponseReceived::No;
ASSERT(ownerElement->document().contentSecurityPolicy());
if (is<HTMLPlugInElement>(ownerElement))
return ownerElement->document().contentSecurityPolicy()->allowObjectFromSource(url, redirectResponseReceived);
return ownerElement->document().contentSecurityPolicy()->allowChildFrameFromSource(url, redirectResponseReceived);
}
PolicyCheckIdentifier PolicyCheckIdentifier::create()
{
static uint64_t identifier = 0;
identifier++;
return PolicyCheckIdentifier { Process::identifier(), identifier };
}
bool PolicyCheckIdentifier::isValidFor(PolicyCheckIdentifier expectedIdentifier)
{
RELEASE_ASSERT_WITH_MESSAGE(m_policyCheck, "Received 0 as the policy check identifier");
RELEASE_ASSERT_WITH_MESSAGE(m_process == expectedIdentifier.m_process, "Received a policy check response for a wrong process");
RELEASE_ASSERT_WITH_MESSAGE(m_policyCheck <= expectedIdentifier.m_policyCheck, "Received a policy check response from the future");
return m_policyCheck == expectedIdentifier.m_policyCheck;
}
FrameLoader::PolicyChecker::PolicyChecker(Frame& frame)
: m_frame(frame)
, m_delegateIsDecidingNavigationPolicy(false)
, m_delegateIsHandlingUnimplementablePolicy(false)
, m_loadType(FrameLoadType::Standard)
{
}
void FrameLoader::PolicyChecker::checkNavigationPolicy(ResourceRequest&& newRequest, const ResourceResponse& redirectResponse, NavigationPolicyDecisionFunction&& function)
{
checkNavigationPolicy(WTFMove(newRequest), redirectResponse, m_frame.loader().activeDocumentLoader(), { }, WTFMove(function));
}
BlobURLHandle FrameLoader::PolicyChecker::extendBlobURLLifetimeIfNecessary(const ResourceRequest& request, PolicyDecisionMode mode) const
{
if (mode != PolicyDecisionMode::Asynchronous || !request.url().protocolIsBlob())
return { };
return BlobURLHandle { request.url() };
}
void FrameLoader::PolicyChecker::checkNavigationPolicy(ResourceRequest&& request, const ResourceResponse& redirectResponse, DocumentLoader* loader, RefPtr<FormState>&& formState, NavigationPolicyDecisionFunction&& function, PolicyDecisionMode policyDecisionMode)
{
NavigationAction action = loader->triggeringAction();
if (action.isEmpty()) {
action = NavigationAction { *m_frame.document(), request, InitiatedByMainFrame::Unknown, NavigationType::Other, loader->shouldOpenExternalURLsPolicyToPropagate() };
loader->setTriggeringAction(NavigationAction { action });
}
if (m_frame.page() && m_frame.page()->openedByDOMWithOpener())
action.setOpenedByDOMWithOpener();
action.setHasOpenedFrames(m_frame.loader().hasOpenedFrames());
// Don't ask more than once for the same request or if we are loading an empty URL.
// This avoids confusion on the part of the client.
if (equalIgnoringHeaderFields(request, loader->lastCheckedRequest()) || (!request.isNull() && request.url().isEmpty())) {
if (!request.isNull() && request.url().isEmpty())
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: continuing because the URL is empty");
else
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: continuing because the URL is the same as the last request");
function(ResourceRequest(request), { }, NavigationPolicyDecision::ContinueLoad);
loader->setLastCheckedRequest(WTFMove(request));
return;
}
// We are always willing to show alternate content for unreachable URLs;
// treat it like a reload so it maintains the right state for b/f list.
auto& substituteData = loader->substituteData();
if (substituteData.isValid() && !substituteData.failingURL().isEmpty()) {
bool shouldContinue = true;
#if ENABLE(CONTENT_FILTERING)
if (auto loader = m_frame.loader().activeDocumentLoader())
shouldContinue = ContentFilter::continueAfterSubstituteDataRequest(*loader, substituteData);
#endif
if (isBackForwardLoadType(m_loadType))
m_loadType = FrameLoadType::Reload;
if (shouldContinue)
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: continuing because we have valid substitute data");
else
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: not continuing with substitute data because the content filter told us not to");
function(WTFMove(request), { }, shouldContinue ? NavigationPolicyDecision::ContinueLoad : NavigationPolicyDecision::IgnoreLoad);
return;
}
if (!isAllowedByContentSecurityPolicy(request.url(), m_frame.ownerElement(), !redirectResponse.isNull())) {
if (m_frame.ownerElement()) {
// Fire a load event (even though we were blocked by CSP) as timing attacks would otherwise
// reveal that the frame was blocked. This way, it looks like any other cross-origin page load.
m_frame.ownerElement()->dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
}
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: ignoring because disallowed by content security policy");
function(WTFMove(request), { }, NavigationPolicyDecision::IgnoreLoad);
return;
}
loader->setLastCheckedRequest(ResourceRequest(request));
#if USE(QUICK_LOOK)
// Always allow QuickLook-generated URLs based on the protocol scheme.
if (!request.isNull() && isQuickLookPreviewURL(request.url())) {
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: continuing because quicklook-generated URL");
return function(WTFMove(request), formState, NavigationPolicyDecision::ContinueLoad);
}
#endif
#if ENABLE(CONTENT_FILTERING)
if (m_contentFilterUnblockHandler.canHandleRequest(request)) {
RefPtr<Frame> frame { &m_frame };
m_contentFilterUnblockHandler.requestUnblockAsync([frame](bool unblocked) {
if (unblocked)
frame->loader().reload();
});
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: ignoring because ContentFilterUnblockHandler can handle the request");
return function({ }, nullptr, NavigationPolicyDecision::IgnoreLoad);
}
m_contentFilterUnblockHandler = { };
#endif
m_frame.loader().clearProvisionalLoadForPolicyCheck();
auto blobURLLifetimeExtension = extendBlobURLLifetimeIfNecessary(request, policyDecisionMode);
bool isInitialEmptyDocumentLoad = !m_frame.loader().stateMachine().committedFirstRealDocumentLoad() && request.url().protocolIsAbout() && !substituteData.isValid();
auto requestIdentifier = PolicyCheckIdentifier::create();
m_delegateIsDecidingNavigationPolicy = true;
String suggestedFilename = action.downloadAttribute().isEmpty() ? nullAtom() : action.downloadAttribute();
FramePolicyFunction decisionHandler = [this, function = WTFMove(function), request = ResourceRequest(request), formState = std::exchange(formState, nullptr), suggestedFilename = WTFMove(suggestedFilename),
blobURLLifetimeExtension = WTFMove(blobURLLifetimeExtension), requestIdentifier, isInitialEmptyDocumentLoad] (PolicyAction policyAction, PolicyCheckIdentifier responseIdentifier) mutable {
if (!responseIdentifier.isValidFor(requestIdentifier)) {
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: ignoring because response is not valid for request");
return function({ }, nullptr, NavigationPolicyDecision::IgnoreLoad);
}
m_delegateIsDecidingNavigationPolicy = false;
switch (policyAction) {
case PolicyAction::Download:
m_frame.loader().setOriginalURLForDownloadRequest(request);
m_frame.loader().client().startDownload(request, suggestedFilename);
FALLTHROUGH;
case PolicyAction::Ignore:
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: ignoring because policyAction from dispatchDecidePolicyForNavigationAction is Ignore");
return function({ }, nullptr, NavigationPolicyDecision::IgnoreLoad);
case PolicyAction::StopAllLoads:
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: stopping because policyAction from dispatchDecidePolicyForNavigationAction is StopAllLoads");
function({ }, nullptr, NavigationPolicyDecision::StopAllLoads);
return;
case PolicyAction::Use:
if (!m_frame.loader().client().canHandleRequest(request)) {
handleUnimplementablePolicy(m_frame.loader().client().cannotShowURLError(request));
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: ignoring because frame loader client can't handle the request");
return function({ }, { }, NavigationPolicyDecision::IgnoreLoad);
}
if (isInitialEmptyDocumentLoad)
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: continuing because this is an initial empty document");
else
POLICYCHECKER_RELEASE_LOG("checkNavigationPolicy: continuing because this policyAction from dispatchDecidePolicyForNavigationAction is Use");
return function(WTFMove(request), formState, NavigationPolicyDecision::ContinueLoad);
}
ASSERT_NOT_REACHED();
};
if (isInitialEmptyDocumentLoad) {
// We ignore the response from the client for initial empty document loads and proceed with the load synchronously.
m_frame.loader().client().dispatchDecidePolicyForNavigationAction(action, request, redirectResponse, formState.get(), policyDecisionMode, requestIdentifier, [](PolicyAction, PolicyCheckIdentifier) { });
decisionHandler(PolicyAction::Use, requestIdentifier);
} else
m_frame.loader().client().dispatchDecidePolicyForNavigationAction(action, request, redirectResponse, formState.get(), policyDecisionMode, requestIdentifier, WTFMove(decisionHandler));
}
void FrameLoader::PolicyChecker::checkNewWindowPolicy(NavigationAction&& navigationAction, ResourceRequest&& request, RefPtr<FormState>&& formState, const String& frameName, NewWindowPolicyDecisionFunction&& function)
{
if (m_frame.document() && m_frame.document()->isSandboxed(SandboxPopups))
return function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
if (!DOMWindow::allowPopUp(m_frame))
return function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
auto blobURLLifetimeExtension = extendBlobURLLifetimeIfNecessary(request);
auto requestIdentifier = PolicyCheckIdentifier::create();
m_frame.loader().client().dispatchDecidePolicyForNewWindowAction(navigationAction, request, formState.get(), frameName, requestIdentifier, [frame = Ref { m_frame }, request,
formState = WTFMove(formState), frameName, navigationAction, function = WTFMove(function), blobURLLifetimeExtension = WTFMove(blobURLLifetimeExtension),
requestIdentifier] (PolicyAction policyAction, PolicyCheckIdentifier responseIdentifier) mutable {
if (!responseIdentifier.isValidFor(requestIdentifier))
return function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
switch (policyAction) {
case PolicyAction::Download:
frame->loader().client().startDownload(request);
FALLTHROUGH;
case PolicyAction::Ignore:
function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
return;
case PolicyAction::StopAllLoads:
ASSERT_NOT_REACHED();
function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
return;
case PolicyAction::Use:
function(request, formState, frameName, navigationAction, ShouldContinuePolicyCheck::Yes);
return;
}
ASSERT_NOT_REACHED();
});
}
void FrameLoader::PolicyChecker::stopCheck()
{
m_frame.loader().client().cancelPolicyCheck();
}
void FrameLoader::PolicyChecker::cannotShowMIMEType(const ResourceResponse& response)
{
handleUnimplementablePolicy(m_frame.loader().client().cannotShowMIMETypeError(response));
}
void FrameLoader::PolicyChecker::handleUnimplementablePolicy(const ResourceError& error)
{
m_delegateIsHandlingUnimplementablePolicy = true;
m_frame.loader().client().dispatchUnableToImplementPolicy(error);
m_delegateIsHandlingUnimplementablePolicy = false;
}
} // namespace WebCore
#undef IS_ALLOWED
#undef PAGE_ID
#undef FRAME_ID
#undef POLICYCHECKER_RELEASE_LOG