/
user_interaction_observer.cc
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/
user_interaction_observer.cc
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// Copyright 2020 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/browser/safe_browsing/user_interaction_observer.h"
#include <string>
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_functions.h"
#include "chrome/browser/profiles/profile.h"
#include "components/omnibox/browser/omnibox_prefs.h"
#include "components/prefs/pref_service.h"
#include "components/safe_browsing/core/features.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "third_party/blink/public/common/input/web_mouse_event.h"
#include "ui/events/keycodes/keyboard_codes.h"
#if BUILDFLAG(ENABLE_EXTENSIONS)
#include "extensions/browser/extension_registry.h"
#endif // BUILDFLAG(ENABLE_EXTENSIONS)
using blink::WebInputEvent;
namespace {
// Id for extension that enables users to report sites to Safe Browsing.
const char kPreventElisionExtensionId[] = "jknemblkbdhdcpllfgbfekkdciegfboi";
} // namespace
namespace safe_browsing {
const char kDelayedWarningsHistogram[] = "SafeBrowsing.DelayedWarnings.Event";
const char kDelayedWarningsTimeOnPageHistogram[] =
"SafeBrowsing.DelayedWarnings.TimeOnPage";
const char kDelayedWarningsWithElisionDisabledHistogram[] =
"SafeBrowsing.DelayedWarnings.Event_UrlElisionDisabled";
const char kDelayedWarningsTimeOnPageWithElisionDisabledHistogram[] =
"SafeBrowsing.DelayedWarnings.TimeOnPage_UrlElisionDisabled";
namespace {
const char kWebContentsUserDataKey[] =
"web_contents_safe_browsing_user_interaction_observer";
bool IsUrlElisionDisabled(Profile* profile,
const char* suspicious_site_reporter_extension_id) {
if (profile &&
profile->GetPrefs()->GetBoolean(omnibox::kPreventUrlElisionsInOmnibox)) {
return true;
}
#if BUILDFLAG(ENABLE_EXTENSIONS)
DCHECK(suspicious_site_reporter_extension_id);
if (profile && extensions::ExtensionRegistry::Get(profile)
->enabled_extensions()
.Contains(suspicious_site_reporter_extension_id)) {
return true;
}
#endif
return false;
}
} // namespace
// static
const char* SafeBrowsingUserInteractionObserver::
suspicious_site_reporter_extension_id_ = kPreventElisionExtensionId;
SafeBrowsingUserInteractionObserver::SafeBrowsingUserInteractionObserver(
content::WebContents* web_contents,
const security_interstitials::UnsafeResource& resource,
bool is_main_frame,
scoped_refptr<SafeBrowsingUIManager> ui_manager)
: content::WebContentsObserver(web_contents),
web_contents_(web_contents),
resource_(resource),
ui_manager_(ui_manager),
creation_time_(base::Time::Now()),
clock_(base::DefaultClock::GetInstance()) {
DCHECK(base::FeatureList::IsEnabled(kDelayedWarnings));
key_press_callback_ =
base::BindRepeating(&SafeBrowsingUserInteractionObserver::HandleKeyPress,
base::Unretained(this));
mouse_event_callback_ = base::BindRepeating(
&SafeBrowsingUserInteractionObserver::HandleMouseEvent,
base::Unretained(this));
// Pass a callback to the render widget host instead of implementing
// WebContentsObserver::DidGetUserInteraction(). The reason for this is that
// render widget host handles keyboard events earlier and the callback can
// indicate that it wants the key press to be ignored.
// (DidGetUserInteraction() can only observe and not cancel the event.)
web_contents->GetMainFrame()
->GetRenderViewHost()
->GetWidget()
->AddKeyPressEventCallback(key_press_callback_);
web_contents->GetMainFrame()
->GetRenderViewHost()
->GetWidget()
->AddMouseEventCallback(mouse_event_callback_);
// Observe permission bubble events.
permissions::PermissionRequestManager* permission_request_manager =
permissions::PermissionRequestManager::FromWebContents(web_contents);
if (permission_request_manager) {
permission_request_manager->AddObserver(this);
}
RecordUMA(DelayedWarningEvent::kPageLoaded);
}
SafeBrowsingUserInteractionObserver::~SafeBrowsingUserInteractionObserver() {
permissions::PermissionRequestManager* permission_request_manager =
permissions::PermissionRequestManager::FromWebContents(web_contents());
if (permission_request_manager) {
permission_request_manager->RemoveObserver(this);
}
web_contents_->GetMainFrame()
->GetRenderViewHost()
->GetWidget()
->RemoveKeyPressEventCallback(key_press_callback_);
web_contents_->GetMainFrame()
->GetRenderViewHost()
->GetWidget()
->RemoveMouseEventCallback(mouse_event_callback_);
}
// static
void SafeBrowsingUserInteractionObserver::CreateForWebContents(
content::WebContents* web_contents,
const security_interstitials::UnsafeResource& resource,
bool is_main_frame,
scoped_refptr<SafeBrowsingUIManager> ui_manager) {
// This method is called for all unsafe resources on |web_contents|. Only
// create an observer if there isn't one.
// TODO(crbug.com/1057157): The observer should observe all unsafe resources
// instead of the first one only.
if (FromWebContents(web_contents)) {
return;
}
DCHECK(!web_contents->IsPortal());
auto observer = std::make_unique<SafeBrowsingUserInteractionObserver>(
web_contents, resource, is_main_frame, ui_manager);
web_contents->SetUserData(kWebContentsUserDataKey, std::move(observer));
}
// static
SafeBrowsingUserInteractionObserver*
SafeBrowsingUserInteractionObserver::FromWebContents(
content::WebContents* web_contents) {
return static_cast<SafeBrowsingUserInteractionObserver*>(
web_contents->GetUserData(kWebContentsUserDataKey));
}
void SafeBrowsingUserInteractionObserver::RenderViewHostChanged(
content::RenderViewHost* old_host,
content::RenderViewHost* new_host) {
// |old_host| can be nullptr if the old RVH was shut down.
if (old_host)
old_host->GetWidget()->RemoveKeyPressEventCallback(key_press_callback_);
new_host->GetWidget()->AddKeyPressEventCallback(key_press_callback_);
if (old_host)
old_host->GetWidget()->RemoveMouseEventCallback(mouse_event_callback_);
new_host->GetWidget()->AddMouseEventCallback(mouse_event_callback_);
}
void SafeBrowsingUserInteractionObserver::WebContentsDestroyed() {
CleanUp();
Detach();
}
void SafeBrowsingUserInteractionObserver::DidFinishNavigation(
content::NavigationHandle* handle) {
// Remove the observer on a top frame navigation to another page. The user is
// now on another page so we don't need to wait for an interaction.
if (!handle->IsInMainFrame() || handle->IsSameDocument()) {
return;
}
// If this is the first navigation we are seeing, it must be the
// navigation that caused this observer to be created.
// As an example, if the user navigates to http://test.site, the order of
// events are:
// 1. SafeBrowsingUrlCheckerImpl detects that the URL should be blocked with
// an interstitial.
// 2. It delays the interstitial and creates an instance of this class.
// 3. DidFinishNavigation() of this class is called.
//
// This means that the first time we are here, we should ignore this event
// because it's not an interesting navigation. We only want to handle the
// navigations that follow.
if (!initial_navigation_finished_) {
initial_navigation_finished_ = true;
return;
}
// If a download happens when an instance of this observer is attached to
// the WebContents, DelayedNavigationThrottle cancels the download. As a
// result, the page should remain unchanged on downloads. Record a metric and
// ignore this cancelled navigation.
if (handle->IsDownload()) {
RecordUMA(DelayedWarningEvent::kDownloadCancelled);
return;
}
Detach();
// DO NOT add code past this point. |this| is destroyed.
}
void SafeBrowsingUserInteractionObserver::Detach() {
if (!interstitial_shown_) {
RecordUMA(DelayedWarningEvent::kWarningNotShown);
}
base::TimeDelta time_on_page = clock_->Now() - creation_time_;
if (IsUrlElisionDisabled(
Profile::FromBrowserContext(web_contents()->GetBrowserContext()),
suspicious_site_reporter_extension_id_)) {
base::UmaHistogramLongTimes(
kDelayedWarningsTimeOnPageWithElisionDisabledHistogram, time_on_page);
} else {
base::UmaHistogramLongTimes(kDelayedWarningsTimeOnPageHistogram,
time_on_page);
}
web_contents()->RemoveUserData(kWebContentsUserDataKey);
// DO NOT add code past this point. |this| is destroyed.
}
void SafeBrowsingUserInteractionObserver::DidToggleFullscreenModeForTab(
bool entered_fullscreen,
bool will_cause_resize) {
// This class is only instantiated upon a navigation. If a page is in
// fullscreen mode, any navigation away from it should exit fullscreen. This
// means that this class is never instantiated while the current web contents
// is in fullscreen mode, so |entered_fullscreen| should never be false when
// this method is called for the first time. However, we don't know if it's
// guaranteed for a page to not be in fullscreen upon navigation, so we just
// ignore this event if the page exited fullscreen.
if (!entered_fullscreen) {
return;
}
// IMPORTANT: Store the web contents pointer in a temporary because |this| is
// deleted after ShowInterstitial().
content::WebContents* contents = web_contents();
ShowInterstitial(DelayedWarningEvent::kWarningShownOnFullscreenAttempt);
// Exit fullscreen only after navigating to the interstitial. We don't want to
// interfere with an ongoing fullscreen request.
contents->ExitFullscreen(will_cause_resize);
// DO NOT add code past this point. |this| is destroyed.
}
void SafeBrowsingUserInteractionObserver::OnPaste() {
ShowInterstitial(DelayedWarningEvent::kWarningShownOnPaste);
// DO NOT add code past this point. |this| is destroyed.
}
void SafeBrowsingUserInteractionObserver::OnBubbleAdded() {
// The page requested a permission that triggered a permission prompt. Deny
// and show the interstitial.
permissions::PermissionRequestManager* permission_request_manager =
permissions::PermissionRequestManager::FromWebContents(web_contents());
if (!permission_request_manager) {
return;
}
permission_request_manager->Deny();
ShowInterstitial(DelayedWarningEvent::kWarningShownOnPermissionRequest);
// DO NOT add code past this point. |this| is destroyed.
}
void SafeBrowsingUserInteractionObserver::OnJavaScriptDialog() {
ShowInterstitial(DelayedWarningEvent::kWarningShownOnJavaScriptDialog);
// DO NOT add code past this point. |this| is destroyed.
}
void SafeBrowsingUserInteractionObserver::OnPasswordSaveOrAutofillDenied() {
if (password_save_or_autofill_denied_metric_recorded_) {
return;
}
password_save_or_autofill_denied_metric_recorded_ = true;
RecordUMA(DelayedWarningEvent::kPasswordSaveOrAutofillDenied);
}
void SafeBrowsingUserInteractionObserver::OnDesktopCaptureRequest() {
ShowInterstitial(DelayedWarningEvent::kWarningShownOnDesktopCaptureRequest);
// DO NOT add code past this point. |this| is destroyed.
}
// static
void SafeBrowsingUserInteractionObserver::
SetSuspiciousSiteReporterExtensionIdForTesting(const char* extension_id) {
suspicious_site_reporter_extension_id_ = extension_id;
}
// static
void SafeBrowsingUserInteractionObserver::
ResetSuspiciousSiteReporterExtensionIdForTesting() {
suspicious_site_reporter_extension_id_ = kPreventElisionExtensionId;
}
void SafeBrowsingUserInteractionObserver::SetClockForTesting(
base::Clock* clock) {
clock_ = clock;
}
base::Time SafeBrowsingUserInteractionObserver::GetCreationTimeForTesting()
const {
return creation_time_;
}
void SafeBrowsingUserInteractionObserver::RecordUMA(DelayedWarningEvent event) {
Profile* profile =
Profile::FromBrowserContext(web_contents()->GetBrowserContext());
if (IsUrlElisionDisabled(profile, suspicious_site_reporter_extension_id_)) {
base::UmaHistogramEnumeration(kDelayedWarningsWithElisionDisabledHistogram,
event);
} else {
base::UmaHistogramEnumeration(kDelayedWarningsHistogram, event);
}
}
bool IsAllowedModifier(const content::NativeWebKeyboardEvent& event) {
const int key_modifiers =
event.GetModifiers() & blink::WebInputEvent::kKeyModifiers;
// If the only modifier is shift, the user may be typing uppercase
// letters.
if (key_modifiers == WebInputEvent::kShiftKey) {
return event.windows_key_code == ui::VKEY_SHIFT;
}
// Disallow CTRL+C and CTRL+V.
if (key_modifiers == WebInputEvent::kControlKey &&
(event.windows_key_code == ui::VKEY_C ||
event.windows_key_code == ui::VKEY_V)) {
return false;
}
return key_modifiers != 0;
}
bool SafeBrowsingUserInteractionObserver::HandleKeyPress(
const content::NativeWebKeyboardEvent& event) {
// Allow non-character keys such as ESC. These can be used to exit fullscreen,
// for example.
if (!event.IsCharacterKey() || event.is_browser_shortcut ||
IsAllowedModifier(event)) {
return false;
}
ShowInterstitial(DelayedWarningEvent::kWarningShownOnKeypress);
// DO NOT add code past this point. |this| is destroyed.
return true;
}
bool SafeBrowsingUserInteractionObserver::HandleMouseEvent(
const blink::WebMouseEvent& event) {
if (event.GetType() != blink::WebInputEvent::Type::kMouseDown) {
return false;
}
// If warning isn't enabled for mouse clicks, still record the first time when
// the user clicks.
if (!kDelayedWarningsEnableMouseClicks.Get()) {
if (!mouse_click_with_no_warning_recorded_) {
RecordUMA(DelayedWarningEvent::kWarningNotTriggeredOnMouseClick);
mouse_click_with_no_warning_recorded_ = true;
}
return false;
}
ShowInterstitial(DelayedWarningEvent::kWarningShownOnMouseClick);
// DO NOT add code past this point. |this| is destroyed.
return true;
}
void SafeBrowsingUserInteractionObserver::ShowInterstitial(
DelayedWarningEvent event) {
// Show the interstitial.
DCHECK(!interstitial_shown_);
interstitial_shown_ = true;
CleanUp();
RecordUMA(event);
SafeBrowsingUIManager::StartDisplayingBlockingPage(ui_manager_, resource_);
Detach();
// DO NOT add code past this point. |this| is destroyed.
}
void SafeBrowsingUserInteractionObserver::CleanUp() {
web_contents_->GetMainFrame()
->GetRenderViewHost()
->GetWidget()
->RemoveKeyPressEventCallback(key_press_callback_);
web_contents_->GetMainFrame()
->GetRenderViewHost()
->GetWidget()
->RemoveMouseEventCallback(mouse_event_callback_);
}
} // namespace safe_browsing