bool XSSAuditor::filterEmbedToken(HTMLToken& token)
{
ASSERT(token.type() == HTMLTokenTypes::StartTag);
ASSERT(hasName(token, embedTag));
bool didBlockScript = false;
if (isContainedInRequest(decodedSnippetForName(token))) {
didBlockScript |= eraseAttributeIfInjected(token, codeAttr, String(), SrcLikeAttribute);
didBlockScript |= eraseAttributeIfInjected(token, srcAttr, blankURL().string(), SrcLikeAttribute);
didBlockScript |= eraseAttributeIfInjected(token, typeAttr);
}
return didBlockScript;
}
bool XSSAuditor::filterScriptToken(HTMLToken& token)
{
ASSERT(token.type() == HTMLTokenTypes::StartTag);
ASSERT(hasName(token, scriptTag));
m_cachedDecodedSnippet = decodedSnippetForName(token);
m_shouldAllowCDATA = m_parser->tokenizer()->shouldAllowCDATA();
if (isContainedInRequest(decodedSnippetForName(token)))
return eraseAttributeIfInjected(token, srcAttr, blankURL().string(), SrcLikeAttribute);
return false;
}
bool XSSAuditor::filterAppletToken(HTMLToken& token)
{
ASSERT(m_state == Initial);
ASSERT(token.type() == HTMLToken::StartTag);
ASSERT(hasName(token, appletTag));
bool didBlockScript = false;
didBlockScript |= eraseAttributeIfInjected(token, codeAttr);
didBlockScript |= eraseAttributeIfInjected(token, objectAttr);
return didBlockScript;
}
bool XSSAuditor::filterEmbedToken(HTMLToken& token)
{
ASSERT(m_state == Initial);
ASSERT(token.type() == HTMLToken::StartTag);
ASSERT(hasName(token, embedTag));
bool didBlockScript = false;
didBlockScript |= eraseAttributeIfInjected(token, srcAttr, blankURL().string());
didBlockScript |= eraseAttributeIfInjected(token, typeAttr);
return didBlockScript;
}
bool XSSAuditor::filterScriptToken(HTMLToken& token)
{
ASSERT(m_state == Initial);
ASSERT(token.type() == HTMLToken::StartTag);
ASSERT(hasName(token, scriptTag));
if (eraseAttributeIfInjected(token, srcAttr, blankURL().string()))
return true;
m_state = AfterScriptStartTag;
m_cachedSnippet = m_parser->sourceForToken(token);
return false;
}
bool XSSAuditor::filterObjectToken(HTMLToken& token)
{
ASSERT(m_state == Initial);
ASSERT(token.type() == HTMLTokenTypes::StartTag);
ASSERT(hasName(token, objectTag));
bool didBlockScript = false;
didBlockScript |= eraseAttributeIfInjected(token, dataAttr, blankURL().string(), SrcLikeAttribute);
didBlockScript |= eraseAttributeIfInjected(token, typeAttr);
didBlockScript |= eraseAttributeIfInjected(token, classidAttr);
return didBlockScript;
}
void XSSAuditor::filterToken(HTMLToken& token)
{
if (m_state == Uninitialized)
init();
ASSERT(m_state == Initialized);
if (!m_isEnabled || m_xssProtection == XSSProtectionDisabled)
return;
bool didBlockScript = false;
if (token.type() == HTMLTokenTypes::StartTag)
didBlockScript = filterStartToken(token);
else if (m_scriptTagNestingLevel) {
if (token.type() == HTMLTokenTypes::Character)
didBlockScript = filterCharacterToken(token);
else if (token.type() == HTMLTokenTypes::EndTag)
filterEndToken(token);
}
if (didBlockScript) {
// FIXME: Consider using a more helpful console message.
DEFINE_STATIC_LOCAL(String, consoleMessage, ("Refused to execute a JavaScript script. Source code of script found within request.\n"));
m_parser->document()->addConsoleMessage(JSMessageSource, LogMessageType, ErrorMessageLevel, consoleMessage);
bool didBlockEntirePage = (m_xssProtection == XSSProtectionBlockEnabled);
if (didBlockEntirePage)
m_parser->document()->frame()->loader()->stopAllLoaders();
if (!m_notifiedClient) {
m_parser->document()->frame()->loader()->client()->didDetectXSS(m_parser->document()->url(), didBlockEntirePage);
m_notifiedClient = true;
}
if (didBlockEntirePage)
m_parser->document()->frame()->navigationScheduler()->scheduleLocationChange(m_parser->document()->securityOrigin(), blankURL(), String());
}
}
void HTMLDocumentParser::constructTreeFromHTMLToken(HTMLToken& rawToken)
{
AtomicHTMLToken token(rawToken);
// We clear the rawToken in case constructTreeFromAtomicToken
// synchronously re-enters the parser. We don't clear the token immedately
// for Character tokens because the AtomicHTMLToken avoids copying the
// characters by keeping a pointer to the underlying buffer in the
// HTMLToken. Fortunately, Character tokens can't cause us to re-enter
// the parser.
//
// FIXME: Stop clearing the rawToken once we start running the parser off
// the main thread or once we stop allowing synchronous JavaScript
// execution from parseAttribute.
if (rawToken.type() != HTMLToken::Character)
rawToken.clear();
m_treeBuilder->constructTree(&token);
if (!rawToken.isUninitialized()) {
ASSERT(rawToken.type() == HTMLToken::Character);
rawToken.clear();
}
}
//------------------------------------------------------------------------------------------------
void XMLReader::HandleStart (HTMLToken t) {
string val = StringUtil::ToLowerCopy(t.GetValue());
if (val == "board")
inBoard = true;
else if (val == "history")
inHistory = true;
else if (val == "move") {
moveNum = 1;
move.SetCaptured(NOTYPE);
inMove = true;
}
if (val == "piece" && inMove) {
switch(moveNum) {
case 0 :
break;
case 1 : {
move.SetType(GetTypeByName(t.GetAttribute("type")));
move.SetColor(GetColorByName(t.GetAttribute("color")));
Position pstart;
pstart.SetRow(atoi((t.GetAttribute("row")).c_str()));
pstart.SetCol(atoi((t.GetAttribute("column")).c_str()));
move.SetStart(pstart);
moveNum++;
break;
}
case 2 : {
Position pend;
pend.SetRow(atoi((t.GetAttribute("row")).c_str()));
pend.SetCol(atoi((t.GetAttribute("column")).c_str()));
move.SetEnd(pend);
moveNum++;
break;
}
case 3 :
move.SetCaptured(GetTypeByName(t.GetAttribute("type")));
moveNum++;
break;
}
}
}
void GameLoader::LoadBoard(HTMLTokenizer & tokenizer, Board * boardPtr) const
{
HTMLToken currentToken = tokenizer.GetNextToken();
while (currentToken.GetValue() != "board")
{
CheckForEndToken(currentToken);
currentToken = tokenizer.GetNextToken();
}
currentToken = tokenizer.GetNextToken();
while (currentToken.GetValue() != "board")
{
CheckForEndToken(currentToken);
if (currentToken.GetValue() == "piece")
{
int pieceType = ConvertTypeStrToInt(currentToken.GetAttribute("type"));
int pieceColor = ConvertColorStrToInt(currentToken.GetAttribute("color"));
int col = atoi(currentToken.GetAttribute("column").c_str());
int row = atoi(currentToken.GetAttribute("row").c_str());
boardPtr->SetPiece(BoardPosition(row, col), pieceType, pieceColor);
}
currentToken = tokenizer.GetNextToken();
}
}
bool XSSFilter::filterTokenAfterScriptStartTag(HTMLToken& token)
{
ASSERT(m_state == AfterScriptStartTag);
m_state = Initial;
if (token.type() != HTMLToken::Character) {
ASSERT(token.type() == HTMLToken::EndTag || token.type() == HTMLToken::EndOfFile);
return false;
}
int start = 0;
// FIXME: We probably want to grab only the first few characters of the
// contents of the script element.
int end = token.endIndex() - token.startIndex();
if (isContainedInRequest(m_cachedSnippet + snippetForRange(token, start, end))) {
token.eraseCharacters();
token.appendToCharacter(' '); // Technically, character tokens can't be empty.
return true;
}
return false;
}
bool XSSAuditor::filterTokenAfterScriptStartTag(HTMLToken& token)
{
ASSERT(m_state == AfterScriptStartTag);
m_state = Initial;
if (token.type() != HTMLTokenTypes::Character) {
ASSERT(token.type() == HTMLTokenTypes::EndTag || token.type() == HTMLTokenTypes::EndOfFile);
return false;
}
TextResourceDecoder* decoder = m_parser->document()->decoder();
if (isContainedInRequest(fullyDecodeString(m_cachedSnippet, decoder))) {
int start = 0;
int end = token.endIndex() - token.startIndex();
String snippet = snippetForJavaScript(snippetForRange(token, start, end));
if (isContainedInRequest(fullyDecodeString(snippet, decoder))) {
token.eraseCharacters();
token.appendToCharacter(' '); // Technically, character tokens can't be empty.
return true;
}
}
return false;
}
void TokenPreloadScanner::updatePredictedBaseURL(const HTMLToken& token)
{
ASSERT(m_predictedBaseElementURL.isEmpty());
if (auto* hrefAttribute = findAttribute(token.attributes(), hrefAttr.localName().string()))
m_predictedBaseElementURL = URL(m_documentURL, stripLeadingAndTrailingHTMLSpaces(StringImpl::create8BitIfPossible(hrefAttribute->value))).isolatedCopy();
}
void TokenPreloadScanner::scan(const HTMLToken& token, Vector<std::unique_ptr<PreloadRequest>>& requests, Document& document)
{
switch (token.type()) {
case HTMLToken::Character:
if (!m_inStyle)
return;
m_cssScanner.scan(token.characters(), requests);
return;
case HTMLToken::EndTag: {
TagId tagId = tagIdFor(token.name());
#if ENABLE(TEMPLATE_ELEMENT)
if (tagId == TagId::Template) {
if (m_templateCount)
--m_templateCount;
return;
}
#endif
if (tagId == TagId::Style) {
if (m_inStyle)
m_cssScanner.reset();
m_inStyle = false;
} else if (tagId == TagId::Picture && !m_pictureSourceState.isEmpty())
m_pictureSourceState.removeLast();
return;
}
case HTMLToken::StartTag: {
#if ENABLE(TEMPLATE_ELEMENT)
if (m_templateCount)
return;
#endif
TagId tagId = tagIdFor(token.name());
#if ENABLE(TEMPLATE_ELEMENT)
if (tagId == TagId::Template) {
++m_templateCount;
return;
}
#endif
if (tagId == TagId::Style) {
m_inStyle = true;
return;
}
if (tagId == TagId::Base) {
// The first <base> element is the one that wins.
if (!m_predictedBaseElementURL.isEmpty())
return;
updatePredictedBaseURL(token);
return;
}
if (tagId == TagId::Picture) {
m_pictureSourceState.append(false);
return;
}
StartTagScanner scanner(tagId, m_deviceScaleFactor);
scanner.processAttributes(token.attributes(), document, m_pictureSourceState);
if (auto request = scanner.createPreloadRequest(m_predictedBaseElementURL))
requests.append(WTFMove(request));
return;
}
default:
return;
}
}
bool HTMLParser::isHeadStart(HTMLToken & token){
string lower = token.GetValue();
StringUtil::ToLower(lower);
return (token.GetType() == TAG_START && lower.compare("head") == 0);
}
void GameLoader::LoadMoveHistory(HTMLTokenizer & tokenizer, MoveHistory * gameHistory) const
{
HTMLToken currentToken = tokenizer.GetNextToken();
while (currentToken.GetValue() != "history")
{
CheckForEndToken(currentToken);
currentToken = tokenizer.GetNextToken();
}
currentToken = tokenizer.GetNextToken();
while (currentToken.GetValue() != "history")
{
CheckForEndToken(currentToken);
if (currentToken.GetValue() == "move"
&& currentToken.GetType() == HTMLTokenType::TAG_START)
{
while (currentToken.GetValue() != "piece")
{
CheckForEndToken(currentToken);
currentToken = tokenizer.GetNextToken();
}
HTMLToken origin = currentToken;
currentToken = tokenizer.GetNextToken();
while (currentToken.GetValue() != "piece")
{
CheckForEndToken(currentToken);
currentToken = tokenizer.GetNextToken();
}
HTMLToken destination = currentToken;
currentToken = tokenizer.GetNextToken();
int originPieceType = ConvertTypeStrToInt(origin.GetAttribute("type"));
int originPieceColor = ConvertColorStrToInt(origin.GetAttribute("color"));
int originCol = atoi(origin.GetAttribute("column").c_str());
int originRow = atoi(origin.GetAttribute("row").c_str());
int destinationCol = atoi(destination.GetAttribute("column").c_str());
int destinationRow = atoi(destination.GetAttribute("row").c_str());
int capturedPieceType = -1;
int capturedCol = -1;
int capturedRow = -1;
while (currentToken.GetValue() != "piece"
&& currentToken.GetValue() != "move")
{
CheckForEndToken(currentToken);
currentToken = tokenizer.GetNextToken();
}
if (currentToken.GetValue() == "piece")
{
capturedPieceType = ConvertTypeStrToInt(currentToken.GetAttribute("type"));
capturedCol = atoi(currentToken.GetAttribute("column").c_str());
capturedRow = atoi(currentToken.GetAttribute("row").c_str());
}
gameHistory->AddMove(Move(originPieceType,
originPieceColor, BoardPosition(originRow, originCol),
BoardPosition(destinationRow, destinationCol),
capturedPieceType, BoardPosition(capturedRow, capturedCol)));
}
else
{
currentToken = tokenizer.GetNextToken();
}
}
}
String XSSAuditor::decodedSnippetForName(const HTMLToken& token)
{
// Grab a fixed number of characters equal to the length of the token's name plus one (to account for the "<").
return fullyDecodeString(m_parser->sourceForToken(token), m_parser->document()->decoder()).substring(0, token.name().size() + 1);
}
bool HTMLParser::isScriptEnd(HTMLToken & token){
string lower = token.GetValue();
StringUtil::ToLower(lower);
return (token.GetType() == TAG_END && lower == "script");
}
bool HTMLParser::isTitleEnd(HTMLToken & token){
string lower = token.GetValue();
StringUtil::ToLower(lower);
return (token.GetType() == TAG_END && lower.compare("title") == 0);
}
static bool hasName(const HTMLToken& token, const QualifiedName& name)
{
return threadSafeMatch(token.name(), name);
}
bool HTMLParser::isText(HTMLToken & token){
string lower = token.GetValue();
StringUtil::ToLower(lower);
return (token.GetType() == TEXT && !isWhiteSpace(lower));
}
CompactHTMLToken::CompactHTMLToken(const HTMLToken& token)
: m_type(token.type())
{
switch (m_type) {
case HTMLTokenTypes::Uninitialized:
ASSERT_NOT_REACHED();
break;
case HTMLTokenTypes::DOCTYPE:
m_data = String(token.name().data(), token.name().size());
m_publicIdentifier = String(token.publicIdentifier().data(), token.publicIdentifier().size());
m_systemIdentifier = String(token.systemIdentifier().data(), token.systemIdentifier().size());
break;
case HTMLTokenTypes::EndOfFile:
break;
case HTMLTokenTypes::StartTag:
m_attributes.reserveInitialCapacity(token.attributes().size());
for (Vector<AttributeBase>::const_iterator it = token.attributes().begin(); it != token.attributes().end(); ++it)
m_attributes.append(CompactAttribute(String(it->m_name.data(), it->m_name.size()), String(it->m_value.data(), it->m_value.size())));
// Fall through!
case HTMLTokenTypes::EndTag:
m_selfClosing = token.selfClosing();
// Fall through!
case HTMLTokenTypes::Comment:
case HTMLTokenTypes::Character:
if (token.isAll8BitData())
m_data = String::make8BitFrom16BitSource(token.data().data(), token.data().size());
else
m_data = String(token.data().data(), token.data().size());
break;
default:
ASSERT_NOT_REACHED();
break;
}
}
bool HTMLParser::isHeaderEnd(HTMLToken & token){
string lower = token.GetValue();
StringUtil::ToLower(lower);
boost::regex re("[hH][1-9]");
return (boost::regex_match(lower, re) && token.GetType() == TAG_END);
}
TEST(AtomicHTMLTokenTest, EmptyAttributeValueFromCompactHTMLToken)
{
HTMLToken token;
token.beginStartTag('a');
token.addNewAttribute();
token.beginAttributeName(3);
token.appendToAttributeName('b');
token.endAttributeName(4);
token.addNewAttribute();
token.beginAttributeName(5);
token.appendToAttributeName('c');
token.endAttributeName(6);
token.beginAttributeValue(8);
token.endAttributeValue(8);
AtomicHTMLToken atoken(CompactHTMLToken(&token, TextPosition()));
const blink::Attribute* attributeB = atoken.getAttributeItem(
QualifiedName(AtomicString(), "b", AtomicString()));
ASSERT_TRUE(attributeB);
EXPECT_FALSE(attributeB->value().isNull());
EXPECT_TRUE(attributeB->value().isEmpty());
const blink::Attribute* attributeC = atoken.getAttributeItem(
QualifiedName(AtomicString(), "c", AtomicString()));
ASSERT_TRUE(attributeC);
EXPECT_FALSE(attributeC->value().isNull());
EXPECT_TRUE(attributeC->value().isEmpty());
const blink::Attribute* attributeD = atoken.getAttributeItem(
QualifiedName(AtomicString(), "d", AtomicString()));
EXPECT_FALSE(attributeD);
}
static bool hasName(const HTMLToken& token, const QualifiedName& name)
{
return equalIgnoringNullity(token.name(), static_cast<const String&>(name.localName()));
}
bool HTMLParser::isLinkStart(HTMLToken & token){
string lower = token.GetValue();
StringUtil::ToLower(lower);
return (token.GetType() == TAG_START && lower == "a");
}