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// Copyright 2014 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/ssl/ssl_error_handler.h"
#include "base/callback_helpers.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/time/time.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ssl/ssl_blocking_page.h"
#include "chrome/browser/ssl/ssl_cert_reporter.h"
#include "chrome/browser/ssl/ssl_error_classification.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/web_contents.h"
#if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
#include "chrome/browser/captive_portal/captive_portal_service.h"
#include "chrome/browser/captive_portal/captive_portal_service_factory.h"
#include "chrome/browser/captive_portal/captive_portal_tab_helper.h"
#include "chrome/browser/ssl/captive_portal_blocking_page.h"
#endif
namespace {
// The type of the delay before displaying the SSL interstitial. This can be
// changed in tests.
SSLErrorHandler::InterstitialDelayType g_interstitial_delay_type =
SSLErrorHandler::NORMAL;
// Callback to call when the interstitial timer is started. Used for testing.
SSLErrorHandler::TimerStartedCallback* g_timer_started_callback = nullptr;
// Events for UMA.
enum SSLErrorHandlerEvent {
HANDLE_ALL,
SHOW_CAPTIVE_PORTAL_INTERSTITIAL_NONOVERRIDABLE,
SHOW_CAPTIVE_PORTAL_INTERSTITIAL_OVERRIDABLE,
SHOW_SSL_INTERSTITIAL_NONOVERRIDABLE,
SHOW_SSL_INTERSTITIAL_OVERRIDABLE,
SHOW_COMMON_NAME_MISMATCH_INTERSTITIAL_NONOVERRIDABLE,
SHOW_COMMON_NAME_MISMATCH_INTERSTITIAL_OVERRIDABLE,
SSL_ERROR_HANDLER_EVENT_COUNT
};
void RecordUMA(SSLErrorHandlerEvent event) {
UMA_HISTOGRAM_ENUMERATION("interstitial.ssl_error_handler",
event,
SSL_ERROR_HANDLER_EVENT_COUNT);
}
// The delay before displaying the SSL interstitial for cert errors.
// - If a "captive portal detected" or "suggested URL valid" result
// arrives in this many seconds, then a captive portal interstitial
// or a common name mismatch interstitial is displayed.
// - Otherwise, an SSL interstitial is displayed.
const int kDefaultInterstitialDisplayDelayInSeconds = 2;
base::TimeDelta GetInterstitialDisplayDelay(
SSLErrorHandler::InterstitialDelayType delay) {
switch (delay) {
case SSLErrorHandler::LONG:
return base::TimeDelta::FromHours(1);
case SSLErrorHandler::NONE:
return base::TimeDelta();
case SSLErrorHandler::NORMAL:
return base::TimeDelta::FromSeconds(
kDefaultInterstitialDisplayDelayInSeconds);
default:
NOTREACHED();
}
return base::TimeDelta();
}
#if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
bool IsCaptivePortalInterstitialEnabled() {
return base::FieldTrialList::FindFullName("CaptivePortalInterstitial") ==
"Enabled";
}
#endif
} // namespace
DEFINE_WEB_CONTENTS_USER_DATA_KEY(SSLErrorHandler);
void SSLErrorHandler::HandleSSLError(
content::WebContents* web_contents,
int cert_error,
const net::SSLInfo& ssl_info,
const GURL& request_url,
int options_mask,
scoped_ptr<SSLCertReporter> ssl_cert_reporter,
const base::Callback<void(bool)>& callback) {
DCHECK(!FromWebContents(web_contents));
web_contents->SetUserData(
UserDataKey(),
new SSLErrorHandler(web_contents, cert_error, ssl_info, request_url,
options_mask, ssl_cert_reporter.Pass(), callback));
SSLErrorHandler* error_handler =
SSLErrorHandler::FromWebContents(web_contents);
error_handler->StartHandlingError();
}
// static
void SSLErrorHandler::SetInterstitialDelayTypeForTest(
SSLErrorHandler::InterstitialDelayType delay) {
g_interstitial_delay_type = delay;
}
// static
void SSLErrorHandler::SetInterstitialTimerStartedCallbackForTest(
TimerStartedCallback* callback) {
DCHECK(!callback || !callback->is_null());
g_timer_started_callback = callback;
}
SSLErrorHandler::SSLErrorHandler(content::WebContents* web_contents,
int cert_error,
const net::SSLInfo& ssl_info,
const GURL& request_url,
int options_mask,
scoped_ptr<SSLCertReporter> ssl_cert_reporter,
const base::Callback<void(bool)>& callback)
: content::WebContentsObserver(web_contents),
web_contents_(web_contents),
cert_error_(cert_error),
ssl_info_(ssl_info),
request_url_(request_url),
options_mask_(options_mask),
callback_(callback),
profile_(Profile::FromBrowserContext(web_contents->GetBrowserContext())),
ssl_cert_reporter_(ssl_cert_reporter.Pass()) {}
SSLErrorHandler::~SSLErrorHandler() {
}
void SSLErrorHandler::StartHandlingError() {
RecordUMA(HANDLE_ALL);
std::vector<std::string> dns_names;
ssl_info_.cert->GetDNSNames(&dns_names);
DCHECK(!dns_names.empty());
GURL suggested_url;
if (ssl_info_.cert_status == net::CERT_STATUS_COMMON_NAME_INVALID &&
GetSuggestedUrl(dns_names, &suggested_url)) {
net::CertStatus extra_cert_errors =
ssl_info_.cert_status ^ net::CERT_STATUS_COMMON_NAME_INVALID;
// Show the SSL intersitial if |CERT_STATUS_COMMON_NAME_INVALID| is not
// the only error. Need not check for captive portal in this case.
// (See the comment below).
if (net::IsCertStatusError(extra_cert_errors) &&
!net::IsCertStatusMinorError(ssl_info_.cert_status)) {
ShowSSLInterstitial();
return;
}
CheckSuggestedUrl(suggested_url);
timer_.Start(FROM_HERE,
GetInterstitialDisplayDelay(g_interstitial_delay_type), this,
&SSLErrorHandler::OnTimerExpired);
if (g_timer_started_callback)
g_timer_started_callback->Run(web_contents_);
// Do not check for a captive portal in this case, because a captive
// portal most likely cannot serve a valid certificate which passes the
// similarity check.
return;
}
#if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
CaptivePortalTabHelper* captive_portal_tab_helper =
CaptivePortalTabHelper::FromWebContents(web_contents_);
if (captive_portal_tab_helper) {
captive_portal_tab_helper->OnSSLCertError(ssl_info_);
}
registrar_.Add(this, chrome::NOTIFICATION_CAPTIVE_PORTAL_CHECK_RESULT,
content::Source<Profile>(profile_));
if (IsCaptivePortalInterstitialEnabled()) {
CheckForCaptivePortal();
timer_.Start(FROM_HERE,
GetInterstitialDisplayDelay(g_interstitial_delay_type),
this, &SSLErrorHandler::OnTimerExpired);
if (g_timer_started_callback)
g_timer_started_callback->Run(web_contents_);
return;
}
#endif
// Display an SSL interstitial.
ShowSSLInterstitial();
}
void SSLErrorHandler::OnTimerExpired() {
ShowSSLInterstitial();
}
bool SSLErrorHandler::GetSuggestedUrl(const std::vector<std::string>& dns_names,
GURL* suggested_url) const {
return CommonNameMismatchHandler::GetSuggestedUrl(request_url_, dns_names,
suggested_url);
}
void SSLErrorHandler::CheckSuggestedUrl(const GURL& suggested_url) {
scoped_refptr<net::URLRequestContextGetter> request_context(
profile_->GetRequestContext());
common_name_mismatch_handler_.reset(
new CommonNameMismatchHandler(request_url_, request_context));
common_name_mismatch_handler_->CheckSuggestedUrl(
suggested_url,
base::Bind(&SSLErrorHandler::CommonNameMismatchHandlerCallback,
base::Unretained(this)));
}
void SSLErrorHandler::NavigateToSuggestedURL(const GURL& suggested_url) {
content::NavigationController::LoadURLParams load_params(suggested_url);
load_params.transition_type = ui::PAGE_TRANSITION_TYPED;
web_contents()->GetController().LoadURLWithParams(load_params);
}
void SSLErrorHandler::CheckForCaptivePortal() {
#if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
CaptivePortalService* captive_portal_service =
CaptivePortalServiceFactory::GetForProfile(profile_);
captive_portal_service->DetectCaptivePortal();
#else
NOTREACHED();
#endif
}
void SSLErrorHandler::ShowCaptivePortalInterstitial(const GURL& landing_url) {
#if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
// Show captive portal blocking page. The interstitial owns the blocking page.
RecordUMA(SSLBlockingPage::IsOverridable(options_mask_, profile_)
? SHOW_CAPTIVE_PORTAL_INTERSTITIAL_OVERRIDABLE
: SHOW_CAPTIVE_PORTAL_INTERSTITIAL_NONOVERRIDABLE);
(new CaptivePortalBlockingPage(web_contents_, request_url_, landing_url,
ssl_cert_reporter_.Pass(), ssl_info_,
callback_))->Show();
// Once an interstitial is displayed, no need to keep the handler around.
// This is the equivalent of "delete this".
web_contents_->RemoveUserData(UserDataKey());
#else
NOTREACHED();
#endif
}
void SSLErrorHandler::ShowSSLInterstitial() {
// Show SSL blocking page. The interstitial owns the blocking page.
RecordUMA(SSLBlockingPage::IsOverridable(options_mask_, profile_)
? SHOW_SSL_INTERSTITIAL_OVERRIDABLE
: SHOW_SSL_INTERSTITIAL_NONOVERRIDABLE);
(new SSLBlockingPage(web_contents_, cert_error_, ssl_info_, request_url_,
options_mask_, base::Time::NowFromSystemTime(),
ssl_cert_reporter_.Pass(), callback_))
->Show();
// Once an interstitial is displayed, no need to keep the handler around.
// This is the equivalent of "delete this".
web_contents_->RemoveUserData(UserDataKey());
}
void SSLErrorHandler::Observe(
int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
#if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
if (type == chrome::NOTIFICATION_CAPTIVE_PORTAL_CHECK_RESULT) {
timer_.Stop();
CaptivePortalService::Results* results =
content::Details<CaptivePortalService::Results>(details).ptr();
if (results->result == captive_portal::RESULT_BEHIND_CAPTIVE_PORTAL)
ShowCaptivePortalInterstitial(results->landing_url);
else
ShowSSLInterstitial();
}
#endif
}
void SSLErrorHandler::DidStartNavigationToPendingEntry(
const GURL& /* url */,
content::NavigationController::ReloadType /* reload_type */) {
// Destroy the error handler on all new navigations. This ensures that the
// handler is properly recreated when a hanging page is navigated to an SSL
// error, even when the tab's WebContents doesn't change.
DeleteSSLErrorHandler();
}
void SSLErrorHandler::NavigationStopped() {
// Destroy the error handler when the page load is stopped.
DeleteSSLErrorHandler();
}
void SSLErrorHandler::DeleteSSLErrorHandler() {
// Need to explicity deny the certificate via the callback, otherwise memory
// is leaked.
if (!callback_.is_null()) {
base::ResetAndReturn(&callback_).Run(false);
}
if (common_name_mismatch_handler_) {
common_name_mismatch_handler_->Cancel();
common_name_mismatch_handler_.reset();
}
web_contents_->RemoveUserData(UserDataKey());
}
void SSLErrorHandler::CommonNameMismatchHandlerCallback(
const CommonNameMismatchHandler::SuggestedUrlCheckResult& result,
const GURL& suggested_url) {
timer_.Stop();
if (result == CommonNameMismatchHandler::SuggestedUrlCheckResult::
SUGGESTED_URL_AVAILABLE) {
NavigateToSuggestedURL(suggested_url);
} else {
ShowSSLInterstitial();
}
}
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