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/*
* Copyright (C) 2006-2022 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/)
* Copyright (C) 2008 Alp Toker <alp@atoker.com>
* Copyright (C) Research In Motion Limited 2009. 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 "SubframeLoader.h"
#include "ContentSecurityPolicy.h"
#include "DiagnosticLoggingClient.h"
#include "DiagnosticLoggingKeys.h"
#include "DocumentLoader.h"
#include "Frame.h"
#include "FrameLoaderClient.h"
#include "HTMLFrameElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLNames.h"
#include "HTMLObjectElement.h"
#include "MIMETypeRegistry.h"
#include "MixedContentChecker.h"
#include "NavigationScheduler.h"
#include "Page.h"
#include "PluginData.h"
#include "PluginDocument.h"
#include "RenderEmbeddedObject.h"
#include "RenderView.h"
#include "ScriptController.h"
#include "SecurityOrigin.h"
#include "SecurityPolicy.h"
#include "Settings.h"
#include <wtf/CompletionHandler.h>
namespace WebCore {
using namespace HTMLNames;
FrameLoader::SubframeLoader::SubframeLoader(Frame& frame)
: m_frame(frame)
{
}
void FrameLoader::SubframeLoader::clear()
{
m_containsPlugins = false;
}
bool FrameLoader::SubframeLoader::requestFrame(HTMLFrameOwnerElement& ownerElement, const String& urlString, const AtomString& frameName, LockHistory lockHistory, LockBackForwardList lockBackForwardList)
{
// Support for <frame src="javascript:string">
URL scriptURL;
URL url;
if (WTF::protocolIsJavaScript(urlString)) {
scriptURL = completeURL(urlString); // completeURL() encodes the URL.
url = aboutBlankURL();
} else
url = completeURL(urlString);
if (shouldConvertInvalidURLsToBlank() && !url.isValid())
url = aboutBlankURL();
// Check the CSP of the embedder to determine if we allow execution of javascript: URLs via child frame navigation.
if (!scriptURL.isEmpty() && !ownerElement.document().contentSecurityPolicy()->allowJavaScriptURLs(aboutBlankURL().string(), { }, scriptURL.string(), &ownerElement))
scriptURL = URL();
// If we will schedule a JavaScript URL load, we need to delay the firing of the load event at least until we've run the JavaScript in the URL.
CompletionHandlerCallingScope stopDelayingLoadEvent;
if (!scriptURL.isEmpty()) {
ownerElement.document().incrementLoadEventDelayCount();
stopDelayingLoadEvent = CompletionHandlerCallingScope([ownerDocument = Ref { ownerElement.document() }] {
ownerDocument->decrementLoadEventDelayCount();
});
}
Frame* frame = loadOrRedirectSubframe(ownerElement, url, frameName, lockHistory, lockBackForwardList);
if (!frame)
return false;
if (!scriptURL.isEmpty() && ownerElement.canLoadScriptURL(scriptURL)) {
// FIXME: Some sites rely on the javascript:'' loading synchronously, which is why we have this special case.
// Blink has the same workaround (https://bugs.chromium.org/p/chromium/issues/detail?id=923585).
if (urlString == "javascript:''"_s || urlString == "javascript:\"\""_s)
frame->script().executeJavaScriptURL(scriptURL);
else
frame->navigationScheduler().scheduleLocationChange(ownerElement.document(), ownerElement.document().securityOrigin(), scriptURL, m_frame.loader().outgoingReferrer(), lockHistory, lockBackForwardList, stopDelayingLoadEvent.release());
}
return true;
}
bool FrameLoader::SubframeLoader::resourceWillUsePlugin(const String& url, const String& mimeType)
{
URL completedURL;
if (!url.isEmpty())
completedURL = completeURL(url);
bool useFallback;
return shouldUsePlugin(completedURL, mimeType, false, useFallback);
}
bool FrameLoader::SubframeLoader::pluginIsLoadable(const URL& url)
{
auto* document = m_frame.document();
if (document) {
if (document->isSandboxed(SandboxPlugins))
return false;
if (!document->securityOrigin().canDisplay(url)) {
FrameLoader::reportLocalLoadFailed(&m_frame, url.string());
return false;
}
if (!portAllowed(url)) {
FrameLoader::reportBlockedLoadFailed(m_frame, url);
return false;
}
if (!MixedContentChecker::canRunInsecureContent(m_frame, document->securityOrigin(), url))
return false;
}
return true;
}
static String findPluginMIMETypeFromURL(Page& page, const URL& url)
{
auto lastPathComponent = url.lastPathComponent();
size_t dotIndex = lastPathComponent.reverseFind('.');
if (dotIndex == notFound)
return { };
auto extensionFromURL = lastPathComponent.substring(dotIndex + 1);
for (auto& type : page.pluginData().webVisibleMimeTypes()) {
for (auto& extension : type.extensions) {
if (equalIgnoringASCIICase(extensionFromURL, extension))
return type.type;
}
}
return { };
}
bool FrameLoader::SubframeLoader::requestPlugin(HTMLPlugInImageElement& ownerElement, const URL& url, const String& explicitMIMEType, const Vector<AtomString>& paramNames, const Vector<AtomString>& paramValues, bool useFallback)
{
String mimeType = explicitMIMEType;
if (mimeType.isEmpty()) {
if (auto page = ownerElement.document().page())
mimeType = findPluginMIMETypeFromURL(*page, url);
}
// Application plug-ins are plug-ins implemented by the user agent, for example Qt plug-ins,
// as opposed to third-party code such as Flash. The user agent decides whether or not they are
// permitted, rather than WebKit.
if (!(m_frame.arePluginsEnabled() || MIMETypeRegistry::isApplicationPluginMIMEType(mimeType)))
return false;
if (!pluginIsLoadable(url))
return false;
ASSERT(ownerElement.hasTagName(objectTag) || ownerElement.hasTagName(embedTag));
return loadPlugin(ownerElement, url, explicitMIMEType, paramNames, paramValues, useFallback);
}
static void logPluginRequest(Page* page, const String& mimeType, const URL& url)
{
if (!page)
return;
String newMIMEType = mimeType;
if (!newMIMEType) {
// Try to figure out the MIME type from the URL extension.
newMIMEType = findPluginMIMETypeFromURL(*page, url);
if (!newMIMEType)
return;
}
String pluginFile = page->pluginData().pluginFileForWebVisibleMimeType(newMIMEType);
String description = !pluginFile ? newMIMEType : pluginFile;
page->sawPlugin(description);
}
bool FrameLoader::SubframeLoader::requestObject(HTMLPlugInImageElement& ownerElement, const String& url, const AtomString& frameName, const String& mimeType, const Vector<AtomString>& paramNames, const Vector<AtomString>& paramValues)
{
if (url.isEmpty() && mimeType.isEmpty())
return false;
auto& document = ownerElement.document();
URL completedURL;
if (!url.isEmpty())
completedURL = completeURL(url);
document.contentSecurityPolicy()->upgradeInsecureRequestIfNeeded(completedURL, ContentSecurityPolicy::InsecureRequestType::Load);
// Historically, we haven't run javascript URLs in <embed> / <object> elements.
if (completedURL.protocolIsJavaScript())
return false;
bool hasFallbackContent = is<HTMLObjectElement>(ownerElement) && downcast<HTMLObjectElement>(ownerElement).hasFallbackContent();
bool useFallback;
if (shouldUsePlugin(completedURL, mimeType, hasFallbackContent, useFallback)) {
bool success = requestPlugin(ownerElement, completedURL, mimeType, paramNames, paramValues, useFallback);
logPluginRequest(document.page(), mimeType, completedURL);
return success;
}
// If the plug-in element already contains a subframe, loadOrRedirectSubframe will re-use it. Otherwise,
// it will create a new frame and set it as the RenderWidget's Widget, causing what was previously
// in the widget to be torn down.
return loadOrRedirectSubframe(ownerElement, completedURL, frameName, LockHistory::Yes, LockBackForwardList::Yes);
}
Frame* FrameLoader::SubframeLoader::loadOrRedirectSubframe(HTMLFrameOwnerElement& ownerElement, const URL& requestURL, const AtomString& frameName, LockHistory lockHistory, LockBackForwardList lockBackForwardList)
{
auto& initiatingDocument = ownerElement.document();
URL upgradedRequestURL = requestURL;
initiatingDocument.contentSecurityPolicy()->upgradeInsecureRequestIfNeeded(upgradedRequestURL, ContentSecurityPolicy::InsecureRequestType::Load);
RefPtr frame = ownerElement.contentFrame();
if (frame)
frame->navigationScheduler().scheduleLocationChange(initiatingDocument, initiatingDocument.securityOrigin(), upgradedRequestURL, m_frame.loader().outgoingReferrer(), lockHistory, lockBackForwardList);
else
frame = loadSubframe(ownerElement, upgradedRequestURL, frameName, m_frame.loader().outgoingReferrer());
if (!frame)
return nullptr;
ASSERT(ownerElement.contentFrame() == frame || !ownerElement.contentFrame());
return ownerElement.contentFrame();
}
RefPtr<Frame> FrameLoader::SubframeLoader::loadSubframe(HTMLFrameOwnerElement& ownerElement, const URL& url, const AtomString& name, const String& referrer)
{
Ref protectedFrame { m_frame };
Ref document = ownerElement.document();
if (!document->securityOrigin().canDisplay(url)) {
FrameLoader::reportLocalLoadFailed(&m_frame, url.string());
return nullptr;
}
if (!portAllowed(url)) {
FrameLoader::reportBlockedLoadFailed(m_frame, url);
return nullptr;
}
if (!SubframeLoadingDisabler::canLoadFrame(ownerElement))
return nullptr;
if (!m_frame.page() || m_frame.page()->subframeCount() >= Page::maxNumberOfFrames)
return nullptr;
// Prevent initial empty document load from triggering load events.
document->incrementLoadEventDelayCount();
auto frame = m_frame.loader().client().createFrame(name, ownerElement);
if (!frame) {
m_frame.loader().checkCallImplicitClose();
document->decrementLoadEventDelayCount();
return nullptr;
}
ReferrerPolicy policy = ownerElement.referrerPolicy();
if (policy == ReferrerPolicy::EmptyString)
policy = document->referrerPolicy();
String referrerToUse = SecurityPolicy::generateReferrerHeader(policy, url, referrer);
m_frame.loader().loadURLIntoChildFrame(url, referrerToUse, frame.get());
document->decrementLoadEventDelayCount();
// The frame's onload handler may have removed it from the document.
if (!frame || !frame->tree().parent()) {
m_frame.loader().checkCallImplicitClose();
return nullptr;
}
// All new frames will have m_isComplete set to true at this point due to synchronously loading
// an empty document in FrameLoader::init(). But many frames will now be starting an
// asynchronous load of url, so we set m_isComplete to false and then check if the load is
// actually completed below. (Note that we set m_isComplete to false even for synchronous
// loads, so that checkCompleted() below won't bail early.)
// FIXME: Can we remove this entirely? m_isComplete normally gets set to false when a load is committed.
frame->loader().started();
auto* renderer = ownerElement.renderer();
auto* view = frame->view();
if (is<RenderWidget>(renderer) && view)
downcast<RenderWidget>(*renderer).setWidget(view);
m_frame.loader().checkCallImplicitClose();
// Some loads are performed synchronously (e.g., about:blank and loads
// cancelled by returning a null ResourceRequest from requestFromDelegate).
// In these cases, the synchronous load would have finished
// before we could connect the signals, so make sure to send the
// completed() signal for the child by hand and mark the load as being
// complete.
// FIXME: In this case the Frame will have finished loading before
// it's being added to the child list. It would be a good idea to
// create the child first, then invoke the loader separately.
if (frame->loader().state() == FrameState::Complete && !frame->loader().policyDocumentLoader())
frame->loader().checkCompleted();
if (!frame->tree().parent())
return nullptr;
return frame;
}
bool FrameLoader::SubframeLoader::shouldUsePlugin(const URL& url, const String& mimeType, bool hasFallback, bool& useFallback)
{
if (m_frame.loader().client().shouldAlwaysUsePluginDocument(mimeType)) {
useFallback = false;
return true;
}
ObjectContentType objectType = m_frame.loader().client().objectContentType(url, mimeType);
// If an object's content can't be handled and it has no fallback, let
// it be handled as a plugin to show the broken plugin icon.
useFallback = objectType == ObjectContentType::None && hasFallback;
return objectType == ObjectContentType::None || objectType == ObjectContentType::PlugIn;
}
bool FrameLoader::SubframeLoader::loadPlugin(HTMLPlugInImageElement& pluginElement, const URL& url, const String& mimeType, const Vector<AtomString>& paramNames, const Vector<AtomString>& paramValues, bool useFallback)
{
if (useFallback)
return false;
auto& document = pluginElement.document();
auto* renderer = pluginElement.renderEmbeddedObject();
// FIXME: This code should not depend on renderer!
if (!renderer)
return false;
IntSize contentSize = roundedIntSize(LayoutSize(renderer->contentWidth(), renderer->contentHeight()));
bool loadManually = is<PluginDocument>(document) && !m_containsPlugins && downcast<PluginDocument>(document).shouldLoadPluginManually();
#if PLATFORM(IOS_FAMILY)
// On iOS, we only tell the plugin to be in full page mode if the containing plugin document is the top level document.
if (document.ownerElement())
loadManually = false;
#endif
WeakPtr weakRenderer { *renderer };
auto widget = m_frame.loader().client().createPlugin(contentSize, pluginElement, url, paramNames, paramValues, mimeType, loadManually);
// The call to createPlugin *may* cause this renderer to disappear from underneath.
if (!weakRenderer)
return false;
if (!widget) {
if (!renderer->isPluginUnavailable())
renderer->setPluginUnavailabilityReason(RenderEmbeddedObject::PluginMissing);
return false;
}
renderer->setWidget(WTFMove(widget));
m_containsPlugins = true;
return true;
}
URL FrameLoader::SubframeLoader::completeURL(const String& url) const
{
ASSERT(m_frame.document());
return m_frame.document()->completeURL(url);
}
bool FrameLoader::SubframeLoader::shouldConvertInvalidURLsToBlank() const
{
return m_frame.settings().shouldConvertInvalidURLsToBlank();
}
} // namespace WebCore