blob: d9437a01699a1a6ba0aed80cc0a2e6dd8de13f17 [file] [log] [blame]
/*
* Copyright (C) 2010. Adam Barth. All rights reserved.
* Copyright (C) 2016 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 "DocumentWriter.h"
#include "ContentSecurityPolicy.h"
#include "DOMImplementation.h"
#include "DOMWindow.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "FrameLoaderStateMachine.h"
#include "FrameView.h"
#include "MIMETypeRegistry.h"
#include "PluginDocument.h"
#include "RawDataDocumentParser.h"
#include "ScriptController.h"
#include "ScriptableDocumentParser.h"
#include "SecurityOrigin.h"
#include "SecurityOriginPolicy.h"
#include "SegmentedString.h"
#include "Settings.h"
#include "SinkDocument.h"
#include "TextResourceDecoder.h"
#include <wtf/Ref.h>
namespace WebCore {
static inline bool canReferToParentFrameEncoding(const Frame* frame, const Frame* parentFrame)
{
return parentFrame && parentFrame->document()->securityOrigin().canAccess(frame->document()->securityOrigin());
}
DocumentWriter::DocumentWriter(Frame* frame)
: m_frame(frame)
, m_hasReceivedSomeData(false)
, m_encodingWasChosenByUser(false)
, m_state(NotStartedWritingState)
{
}
// This is only called by ScriptController::executeIfJavaScriptURL
// and always contains the result of evaluating a javascript: url.
// This is the <iframe src="javascript:'html'"> case.
void DocumentWriter::replaceDocument(const String& source, Document* ownerDocument)
{
m_frame->loader().stopAllLoaders();
// If we are in the midst of changing the frame's document, don't execute script
// that modifies the document further:
if (m_frame->documentIsBeingReplaced())
return;
begin(m_frame->document()->url(), true, ownerDocument);
// begin() might fire an unload event, which will result in a situation where no new document has been attached,
// and the old document has been detached. Therefore, bail out if no document is attached.
if (!m_frame->document())
return;
if (!source.isNull()) {
if (!m_hasReceivedSomeData) {
m_hasReceivedSomeData = true;
m_frame->document()->setCompatibilityMode(DocumentCompatibilityMode::NoQuirksMode);
}
// FIXME: This should call DocumentParser::appendBytes instead of append
// to support RawDataDocumentParsers.
if (DocumentParser* parser = m_frame->document()->parser())
parser->append(source.impl());
}
end();
}
void DocumentWriter::clear()
{
m_decoder = nullptr;
m_hasReceivedSomeData = false;
if (!m_encodingWasChosenByUser)
m_encoding = String();
}
bool DocumentWriter::begin()
{
return begin(URL());
}
Ref<Document> DocumentWriter::createDocument(const URL& url)
{
if (!m_frame->loader().stateMachine().isDisplayingInitialEmptyDocument() && m_frame->loader().client().shouldAlwaysUsePluginDocument(m_mimeType))
return PluginDocument::create(m_frame, url);
#if PLATFORM(IOS)
if (MIMETypeRegistry::isPDFMIMEType(m_mimeType) && (m_frame->isMainFrame() || !m_frame->settings().useImageDocumentForSubframePDF()))
return SinkDocument::create(m_frame, url);
#endif
if (!m_frame->loader().client().hasHTMLView())
return Document::createNonRenderedPlaceholder(m_frame, url);
return DOMImplementation::createDocument(m_mimeType, m_frame, url);
}
bool DocumentWriter::begin(const URL& urlReference, bool dispatch, Document* ownerDocument)
{
// We grab a local copy of the URL because it's easy for callers to supply
// a URL that will be deallocated during the execution of this function.
// For example, see <https://bugs.webkit.org/show_bug.cgi?id=66360>.
URL url = urlReference;
// Create a new document before clearing the frame, because it may need to
// inherit an aliased security context.
Ref<Document> document = createDocument(url);
// If the new document is for a Plugin but we're supposed to be sandboxed from Plugins,
// then replace the document with one whose parser will ignore the incoming data (bug 39323)
if (document->isPluginDocument() && document->isSandboxed(SandboxPlugins))
document = SinkDocument::create(m_frame, url);
// FIXME: Do we need to consult the content security policy here about blocked plug-ins?
bool shouldReuseDefaultView = m_frame->loader().stateMachine().isDisplayingInitialEmptyDocument() && m_frame->document()->isSecureTransitionTo(url);
if (shouldReuseDefaultView)
document->takeDOMWindowFrom(m_frame->document());
else
document->createDOMWindow();
// Per <http://www.w3.org/TR/upgrade-insecure-requests/>, we need to retain an ongoing set of upgraded
// requests in new navigation contexts. Although this information is present when we construct the
// Document object, it is discard in the subsequent 'clear' statements below. So, we must capture it
// so we can restore it.
HashSet<SecurityOriginData> insecureNavigationRequestsToUpgrade;
if (auto* existingDocument = m_frame->document())
insecureNavigationRequestsToUpgrade = existingDocument->contentSecurityPolicy()->takeNavigationRequestsToUpgrade();
m_frame->loader().clear(document.ptr(), !shouldReuseDefaultView, !shouldReuseDefaultView);
clear();
// m_frame->loader().clear() might fire unload event which could remove the view of the document.
// Bail out if document has no view.
if (!document->view())
return false;
if (!shouldReuseDefaultView)
m_frame->script().updatePlatformScriptObjects();
m_frame->loader().setOutgoingReferrer(url);
m_frame->setDocument(document.copyRef());
document->contentSecurityPolicy()->setInsecureNavigationRequestsToUpgrade(WTFMove(insecureNavigationRequestsToUpgrade));
if (m_decoder)
document->setDecoder(m_decoder.get());
if (ownerDocument) {
document->setCookieURL(ownerDocument->cookieURL());
document->setSecurityOriginPolicy(ownerDocument->securityOriginPolicy());
document->setStrictMixedContentMode(ownerDocument->isStrictMixedContentMode());
}
m_frame->loader().didBeginDocument(dispatch);
document->implicitOpen();
// We grab a reference to the parser so that we'll always send data to the
// original parser, even if the document acquires a new parser (e.g., via
// document.open).
m_parser = document->parser();
if (m_frame->view() && m_frame->loader().client().hasHTMLView())
m_frame->view()->setContentsSize(IntSize());
m_state = StartedWritingState;
return true;
}
TextResourceDecoder* DocumentWriter::createDecoderIfNeeded()
{
if (!m_decoder) {
m_decoder = TextResourceDecoder::create(m_mimeType,
m_frame->settings().defaultTextEncodingName(),
m_frame->settings().usesEncodingDetector());
Frame* parentFrame = m_frame->tree().parent();
// Set the hint encoding to the parent frame encoding only if
// the parent and the current frames share the security origin.
// We impose this condition because somebody can make a child frame
// containing a carefully crafted html/javascript in one encoding
// that can be mistaken for hintEncoding (or related encoding) by
// an auto detector. When interpreted in the latter, it could be
// an attack vector.
// FIXME: This might be too cautious for non-7bit-encodings and
// we may consider relaxing this later after testing.
if (canReferToParentFrameEncoding(m_frame, parentFrame))
m_decoder->setHintEncoding(parentFrame->document()->decoder());
if (m_encoding.isEmpty()) {
if (canReferToParentFrameEncoding(m_frame, parentFrame))
m_decoder->setEncoding(parentFrame->document()->textEncoding(), TextResourceDecoder::EncodingFromParentFrame);
} else {
m_decoder->setEncoding(m_encoding,
m_encodingWasChosenByUser ? TextResourceDecoder::UserChosenEncoding : TextResourceDecoder::EncodingFromHTTPHeader);
}
m_frame->document()->setDecoder(m_decoder.get());
}
return m_decoder.get();
}
void DocumentWriter::reportDataReceived()
{
ASSERT(m_decoder);
if (m_hasReceivedSomeData)
return;
m_hasReceivedSomeData = true;
if (m_decoder->encoding().usesVisualOrdering())
m_frame->document()->setVisuallyOrdered();
m_frame->document()->resolveStyle(Document::ResolveStyleType::Rebuild);
}
void DocumentWriter::addData(const char* bytes, size_t length)
{
// Check that we're inside begin()/end().
// FIXME: Change these to ASSERT once https://bugs.webkit.org/show_bug.cgi?id=80427 has
// been resolved.
if (m_state == NotStartedWritingState)
CRASH();
if (m_state == FinishedWritingState)
CRASH();
ASSERT(m_parser);
m_parser->appendBytes(*this, bytes, length);
}
void DocumentWriter::end()
{
ASSERT(m_frame->page());
ASSERT(m_frame->document());
// The parser is guaranteed to be released after this point. begin() would
// have to be called again before we can start writing more data.
m_state = FinishedWritingState;
// http://bugs.webkit.org/show_bug.cgi?id=10854
// The frame's last ref may be removed and it can be deleted by checkCompleted(),
// so we'll add a protective refcount
Ref<Frame> protect(*m_frame);
if (!m_parser)
return;
// FIXME: m_parser->finish() should imply m_parser->flush().
m_parser->flush(*this);
if (!m_parser)
return;
m_parser->finish();
m_parser = nullptr;
}
void DocumentWriter::setEncoding(const String& name, bool userChosen)
{
m_encoding = name;
m_encodingWasChosenByUser = userChosen;
}
void DocumentWriter::setDocumentWasLoadedAsPartOfNavigation()
{
ASSERT(m_parser && !m_parser->isStopped());
m_parser->setDocumentWasLoadedAsPartOfNavigation();
}
} // namespace WebCore