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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/safe_browsing/phishing_classifier_delegate.h"
#include <set>
#include "base/callback.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/scoped_callback_factory.h"
#include "chrome/common/safebrowsing_messages.h"
#include "chrome/renderer/render_thread.h"
#include "chrome/renderer/safe_browsing/feature_extractor_clock.h"
#include "chrome/renderer/safe_browsing/phishing_classifier.h"
#include "chrome/renderer/safe_browsing/scorer.h"
#include "content/renderer/navigation_state.h"
#include "content/renderer/render_view.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebURL.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
namespace safe_browsing {
static GURL StripRef(const GURL& url) {
GURL::Replacements replacements;
replacements.ClearRef();
return url.ReplaceComponents(replacements);
}
typedef std::set<PhishingClassifierDelegate*> PhishingClassifierDelegates;
static base::LazyInstance<PhishingClassifierDelegates>
g_delegates(base::LINKER_INITIALIZED);
static base::LazyInstance<scoped_ptr<const safe_browsing::Scorer> >
g_phishing_scorer(base::LINKER_INITIALIZED);
class ScorerCallback {
public:
static Scorer::CreationCallback* CreateCallback() {
ScorerCallback* scorer_callback = new ScorerCallback();
return scorer_callback->callback_factory_->NewCallback(
&ScorerCallback::PhishingScorerCreated);
}
private:
ScorerCallback() {
callback_factory_.reset(
new base::ScopedCallbackFactory<ScorerCallback>(this));
}
// Callback to be run once the phishing Scorer has been created.
void PhishingScorerCreated(safe_browsing::Scorer* scorer) {
if (!scorer) {
DLOG(ERROR) << "Unable to create a PhishingScorer - corrupt model?";
return;
}
g_phishing_scorer.Get().reset(scorer);
PhishingClassifierDelegates::iterator i;
for (i = g_delegates.Get().begin(); i != g_delegates.Get().end(); ++i)
(*i)->SetPhishingScorer(scorer);
delete this;
}
scoped_ptr<base::ScopedCallbackFactory<ScorerCallback> > callback_factory_;
};
void PhishingClassifierDelegate::SetPhishingModel(
IPC::PlatformFileForTransit model_file) {
safe_browsing::Scorer::CreateFromFile(
IPC::PlatformFileForTransitToPlatformFile(model_file),
RenderThread::current()->GetFileThreadMessageLoopProxy(),
ScorerCallback::CreateCallback());
}
PhishingClassifierDelegate::PhishingClassifierDelegate(
RenderView* render_view,
PhishingClassifier* classifier)
: RenderViewObserver(render_view),
last_finished_load_id_(-1),
last_page_id_sent_to_classifier_(-1) {
g_delegates.Get().insert(this);
if (!classifier) {
classifier = new PhishingClassifier(render_view,
new FeatureExtractorClock());
}
classifier_.reset(classifier);
if (g_phishing_scorer.Get().get())
SetPhishingScorer(g_phishing_scorer.Get().get());
}
PhishingClassifierDelegate::~PhishingClassifierDelegate() {
CancelPendingClassification();
g_delegates.Get().erase(this);
}
void PhishingClassifierDelegate::SetPhishingScorer(
const safe_browsing::Scorer* scorer) {
if (!render_view()->webview())
return; // RenderView is tearing down.
classifier_->set_phishing_scorer(scorer);
// Start classifying the current page if all conditions are met.
// See MaybeStartClassification() for details.
MaybeStartClassification();
}
void PhishingClassifierDelegate::OnStartPhishingDetection(const GURL& url) {
last_url_received_from_browser_ = StripRef(url);
// Start classifying the current page if all conditions are met.
// See MaybeStartClassification() for details.
MaybeStartClassification();
}
void PhishingClassifierDelegate::DidCommitProvisionalLoad(
WebKit::WebFrame* frame, bool is_new_navigation) {
// A new page is starting to load. Unless the load is a navigation within
// the same page, we need to cancel classification since we may get an
// inconsistent result.
NavigationState* state = NavigationState::FromDataSource(
frame->dataSource());
if (!state->was_within_same_page()) {
CancelPendingClassification();
}
}
void PhishingClassifierDelegate::PageCaptured(const string16& page_text) {
last_finished_load_id_ = render_view()->page_id();
last_finished_load_url_ = StripToplevelUrl();
classifier_page_text_ = page_text;
MaybeStartClassification();
}
void PhishingClassifierDelegate::CancelPendingClassification() {
if (classifier_->is_ready()) {
classifier_->CancelPendingClassification();
}
classifier_page_text_.clear();
}
bool PhishingClassifierDelegate::OnMessageReceived(
const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PhishingClassifierDelegate, message)
IPC_MESSAGE_HANDLER(SafeBrowsingMsg_StartPhishingDetection,
OnStartPhishingDetection)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void PhishingClassifierDelegate::ClassificationDone(bool is_phishy,
double phishy_score) {
// We no longer need the page text.
classifier_page_text_.clear();
VLOG(2) << "Phishy verdict = " << is_phishy << " score = " << phishy_score;
if (!is_phishy) {
return;
}
Send(new SafeBrowsingHostMsg_DetectedPhishingSite(
routing_id(),
last_url_sent_to_classifier_,
phishy_score));
}
GURL PhishingClassifierDelegate::StripToplevelUrl() {
return StripRef(render_view()->webview()->mainFrame()->url());
}
void PhishingClassifierDelegate::MaybeStartClassification() {
// We can begin phishing classification when the following conditions are
// met:
// 1. A Scorer has been created
// 2. The browser has sent a StartPhishingDetection message for the current
// toplevel URL.
// 3. The page has finished loading and the page text has been extracted.
// 4. The load is a new navigation (not a session history navigation).
// 5. The toplevel URL has not already been classified.
//
// Note that if we determine that this particular navigation should not be
// classified at all (as opposed to deferring it until we get an IPC or the
// load completes), we discard the page text since it won't be needed.
if (!classifier_->is_ready()) {
VLOG(2) << "Not starting classification, no Scorer created.";
// Keep classifier_page_text_, in case a Scorer is set later.
return;
}
if (last_finished_load_id_ <= last_page_id_sent_to_classifier_) {
// Skip loads from session history navigation.
VLOG(2) << "Not starting classification, last finished load id is "
<< last_finished_load_id_ << " but we have classified up to "
<< "load id " << last_page_id_sent_to_classifier_;
classifier_page_text_.clear(); // we won't need this.
return;
}
if (last_finished_load_id_ != render_view()->page_id()) {
VLOG(2) << "Render view page has changed, not starting classification";
classifier_page_text_.clear(); // we won't need this.
return;
}
// If the page id is unchanged, the toplevel URL should also be unchanged.
DCHECK_EQ(StripToplevelUrl(), last_finished_load_url_);
if (last_finished_load_url_ == last_url_sent_to_classifier_) {
// We've already classified this toplevel URL, so this was likely an
// in-page navigation or a subframe navigation. The browser should not
// send a StartPhishingDetection IPC in this case.
VLOG(2) << "Toplevel URL is unchanged, not starting classification.";
classifier_page_text_.clear(); // we won't need this.
return;
}
if (last_url_received_from_browser_ != last_finished_load_url_) {
// The browser has not yet confirmed that this URL should be classified,
// so defer classification for now.
VLOG(2) << "Not starting classification, last url from browser is "
<< last_url_received_from_browser_ << ", last finished load is "
<< last_finished_load_url_;
// Keep classifier_page_text_, in case the browser notifies us later that
// we should classify the URL.
return;
}
VLOG(2) << "Starting classification for " << last_finished_load_url_;
last_url_sent_to_classifier_ = last_finished_load_url_;
last_page_id_sent_to_classifier_ = last_finished_load_id_;
classifier_->BeginClassification(
&classifier_page_text_,
NewCallback(this, &PhishingClassifierDelegate::ClassificationDone));
}
} // namespace safe_browsing
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