chrome/browser/ssl/security_state_tab_helper.cc

// Copyright 2015 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/security_state_tab_helper.h"

#include "base/bind.h"
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/safe_browsing/safe_browsing_service.h"
#include "chrome/browser/safe_browsing/ui_manager.h"
#include "chrome/common/pref_names.h"
#include "components/prefs/pref_service.h"
#include "components/safe_browsing/features.h"
#include "components/security_state/content/content_utils.h"
#include "components/toolbar/toolbar_field_trial.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/ssl_status.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/origin_util.h"
#include "net/base/net_errors.h"
#include "net/cert/x509_certificate.h"
#include "net/ssl/ssl_cipher_suite_names.h"
#include "net/ssl/ssl_connection_status_flags.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"

#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/policy/policy_cert_service.h"
#include "chrome/browser/chromeos/policy/policy_cert_service_factory.h"
#endif  // defined(OS_CHROMEOS)

#if defined(SAFE_BROWSING_DB_LOCAL)
#include "chrome/browser/safe_browsing/chrome_password_protection_service.h"
#endif

namespace {

void RecordSecurityLevel(const security_state::SecurityInfo& security_info) {
  if (security_info.scheme_is_cryptographic) {
    UMA_HISTOGRAM_ENUMERATION("Security.SecurityLevel.CryptographicScheme",
                              security_info.security_level,
                              security_state::SECURITY_LEVEL_COUNT);
  } else {
    UMA_HISTOGRAM_ENUMERATION("Security.SecurityLevel.NoncryptographicScheme",
                              security_info.security_level,
                              security_state::SECURITY_LEVEL_COUNT);
  }
}

}  // namespace

DEFINE_WEB_CONTENTS_USER_DATA_KEY(SecurityStateTabHelper);

using safe_browsing::SafeBrowsingUIManager;

SecurityStateTabHelper::SecurityStateTabHelper(
    content::WebContents* web_contents)
    : content::WebContentsObserver(web_contents),
      logged_http_warning_on_current_navigation_(false),
      is_incognito_(false) {
  content::BrowserContext* context = web_contents->GetBrowserContext();
  if (context->IsOffTheRecord() &&
      !Profile::FromBrowserContext(context)->IsGuestSession()) {
    is_incognito_ = true;
  }
}

SecurityStateTabHelper::~SecurityStateTabHelper() {}

void SecurityStateTabHelper::GetSecurityInfo(
    security_state::SecurityInfo* result) const {
  security_state::GetSecurityInfo(GetVisibleSecurityState(),
                                  UsedPolicyInstalledCertificate(),
                                  base::Bind(&content::IsOriginSecure), result);
}

void SecurityStateTabHelper::DidStartNavigation(
    content::NavigationHandle* navigation_handle) {
  if (navigation_handle->IsFormSubmission()) {
    security_state::SecurityInfo info;
    GetSecurityInfo(&info);
    UMA_HISTOGRAM_ENUMERATION("Security.SecurityLevel.FormSubmission",
                              info.security_level,
                              security_state::SECURITY_LEVEL_COUNT);
  }
  if (time_of_http_warning_on_current_navigation_.is_null() ||
      !navigation_handle->IsInMainFrame() ||
      navigation_handle->IsSameDocument()) {
    return;
  }
  // Record how quickly a user leaves a site after encountering an
  // HTTP-bad warning. A navigation here only counts if it is a
  // main-frame, not-same-page navigation, since it aims to measure how
  // quickly a user leaves a site after seeing the HTTP warning.
  UMA_HISTOGRAM_LONG_TIMES(
      "Security.HTTPBad.NavigationStartedAfterUserWarnedAboutSensitiveInput",
      base::Time::Now() - time_of_http_warning_on_current_navigation_);
  // After recording the histogram, clear the time of the warning. A
  // timing histogram will not be recorded again on this page, because
  // the time is only set the first time the HTTP-bad warning is shown
  // per page.
  time_of_http_warning_on_current_navigation_ = base::Time();
}

void SecurityStateTabHelper::DidFinishNavigation(
    content::NavigationHandle* navigation_handle) {
  // Ignore subframe navigations, same-document navigations, and navigations
  // that did not commit (e.g. HTTP/204 or file downloads).
  if (!navigation_handle->IsInMainFrame() ||
      navigation_handle->IsSameDocument() ||
      !navigation_handle->HasCommitted()) {
    return;
  }

  content::NavigationEntry* entry =
      web_contents()->GetController().GetLastCommittedEntry();
  if (entry) {
    UMA_HISTOGRAM_ENUMERATION(
        "Security.CertificateTransparency.MainFrameNavigationCompliance",
        entry->GetSSL().ct_policy_compliance,
        net::ct::CTPolicyCompliance::CT_POLICY_MAX);
  }

  logged_http_warning_on_current_navigation_ = false;

  security_state::SecurityInfo security_info;
  GetSecurityInfo(&security_info);
  if (security_info.incognito_downgraded_security_level) {
    web_contents()->GetMainFrame()->AddMessageToConsole(
        content::CONSOLE_MESSAGE_LEVEL_WARNING,
        "This page was loaded non-securely in an incognito mode browser. A "
        "warning has been added to the URL bar. For more information, see "
        "https://goo.gl/y8SRRv.");
  }
  if (net::IsCertStatusError(security_info.cert_status) &&
      !net::IsCertStatusMinorError(security_info.cert_status) &&
      !navigation_handle->IsErrorPage()) {
    // Record each time a user visits a site after having clicked through a
    // certificate warning interstitial. This is used as a baseline for
    // interstitial.ssl.did_user_revoke_decision2 in order to determine how
    // many times the re-enable warnings button is clicked, as a fraction of
    // the number of times it was available.
    UMA_HISTOGRAM_BOOLEAN("interstitial.ssl.visited_site_after_warning", true);
  }

  // Security indicator UI study (https://crbug.com/803501): Show a message in
  // the console to reduce developer confusion about the experimental UI
  // treatments for HTTPS pages with EV certificates.
  const std::string parameter =
      base::FeatureList::IsEnabled(toolbar::features::kSimplifyHttpsIndicator)
          ? base::GetFieldTrialParamValueByFeature(
                toolbar::features::kSimplifyHttpsIndicator,
                toolbar::features::kSimplifyHttpsIndicatorParameterName)
          : std::string();
  if (security_info.security_level == security_state::EV_SECURE) {
    if (parameter ==
        toolbar::features::kSimplifyHttpsIndicatorParameterEvToSecure) {
      web_contents()->GetMainFrame()->AddMessageToConsole(
          content::CONSOLE_MESSAGE_LEVEL_INFO,
          "As part of an experiment, Chrome temporarily shows only the "
          "\"Secure\" text in the address bar. Your SSL certificate with "
          "Extended Validation is still valid.");
    }
    if (parameter ==
        toolbar::features::kSimplifyHttpsIndicatorParameterBothToLock) {
      web_contents()->GetMainFrame()->AddMessageToConsole(
          content::CONSOLE_MESSAGE_LEVEL_INFO,
          "As part of an experiment, Chrome temporarily shows only the lock "
          "icon in the address bar. Your SSL certificate with Extended "
          "Validation is still valid.");
    }
  }
}

void SecurityStateTabHelper::DidChangeVisibleSecurityState() {
  security_state::SecurityInfo security_info;
  GetSecurityInfo(&security_info);
  RecordSecurityLevel(security_info);

  if (logged_http_warning_on_current_navigation_)
    return;

  if (!security_info.insecure_input_events.password_field_shown &&
      !security_info.insecure_input_events.credit_card_field_edited) {
    return;
  }

  DCHECK(time_of_http_warning_on_current_navigation_.is_null());
  time_of_http_warning_on_current_navigation_ = base::Time::Now();

  logged_http_warning_on_current_navigation_ = true;
  web_contents()->GetMainFrame()->AddMessageToConsole(
      content::CONSOLE_MESSAGE_LEVEL_WARNING,
      "This page includes a password or credit card input in a non-secure "
      "context. A warning has been added to the URL bar. For more "
      "information, see https://goo.gl/zmWq3m.");

  // |warning_is_user_visible| will only be false if the user has set the flag
  // for marking HTTP pages as Dangerous. In that case, the page will be
  // flagged as Dangerous, but it isn't distinguished from other HTTP pages,
  // which is why this code records it as not-user-visible.
  bool warning_is_user_visible =
      (security_info.security_level == security_state::HTTP_SHOW_WARNING);

  if (security_info.insecure_input_events.credit_card_field_edited) {
    UMA_HISTOGRAM_BOOLEAN(
        "Security.HTTPBad.UserWarnedAboutSensitiveInput.CreditCard",
        warning_is_user_visible);
  }
  if (security_info.insecure_input_events.password_field_shown) {
    UMA_HISTOGRAM_BOOLEAN(
        "Security.HTTPBad.UserWarnedAboutSensitiveInput.Password",
        warning_is_user_visible);
  }
}

void SecurityStateTabHelper::WebContentsDestroyed() {
  if (time_of_http_warning_on_current_navigation_.is_null()) {
    return;
  }
  // Record how quickly the tab is closed after a user encounters an
  // HTTP-bad warning. This histogram will only be recorded if the
  // WebContents is destroyed before another navigation begins.
  UMA_HISTOGRAM_LONG_TIMES(
      "Security.HTTPBad.WebContentsDestroyedAfterUserWarnedAboutSensitiveInput",
      base::Time::Now() - time_of_http_warning_on_current_navigation_);
}

bool SecurityStateTabHelper::UsedPolicyInstalledCertificate() const {
#if defined(OS_CHROMEOS)
  policy::PolicyCertService* service =
      policy::PolicyCertServiceFactory::GetForProfile(
          Profile::FromBrowserContext(web_contents()->GetBrowserContext()));
  if (service && service->UsedPolicyCertificates())
    return true;
#endif
  return false;
}

security_state::MaliciousContentStatus
SecurityStateTabHelper::GetMaliciousContentStatus() const {
  content::NavigationEntry* entry =
      web_contents()->GetController().GetVisibleEntry();
  if (!entry)
    return security_state::MALICIOUS_CONTENT_STATUS_NONE;
  safe_browsing::SafeBrowsingService* sb_service =
      g_browser_process->safe_browsing_service();
  if (!sb_service)
    return security_state::MALICIOUS_CONTENT_STATUS_NONE;
  scoped_refptr<SafeBrowsingUIManager> sb_ui_manager = sb_service->ui_manager();
  safe_browsing::SBThreatType threat_type;
  if (sb_ui_manager->IsUrlWhitelistedOrPendingForWebContents(
          entry->GetURL(), false, entry, web_contents(), false, &threat_type)) {
    switch (threat_type) {
      case safe_browsing::SB_THREAT_TYPE_UNUSED:
      case safe_browsing::SB_THREAT_TYPE_SAFE:
        break;
      case safe_browsing::SB_THREAT_TYPE_URL_PHISHING:
      case safe_browsing::SB_THREAT_TYPE_URL_CLIENT_SIDE_PHISHING:
        return security_state::MALICIOUS_CONTENT_STATUS_SOCIAL_ENGINEERING;
      case safe_browsing::SB_THREAT_TYPE_URL_MALWARE:
      case safe_browsing::SB_THREAT_TYPE_URL_CLIENT_SIDE_MALWARE:
        return security_state::MALICIOUS_CONTENT_STATUS_MALWARE;
      case safe_browsing::SB_THREAT_TYPE_URL_UNWANTED:
        return security_state::MALICIOUS_CONTENT_STATUS_UNWANTED_SOFTWARE;
      case safe_browsing::SB_THREAT_TYPE_SIGN_IN_PASSWORD_REUSE:
#if defined(SAFE_BROWSING_DB_LOCAL)
        if (safe_browsing::ChromePasswordProtectionService::
                ShouldShowPasswordReusePageInfoBubble(
                    web_contents(),
                    safe_browsing::LoginReputationClientRequest::
                        PasswordReuseEvent::SIGN_IN_PASSWORD)) {
          return security_state::
              MALICIOUS_CONTENT_STATUS_SIGN_IN_PASSWORD_REUSE;
        }
        // If user has already changed Gaia password, returns the regular
        // social engineering content status.
        return security_state::MALICIOUS_CONTENT_STATUS_SOCIAL_ENGINEERING;
#endif
      case safe_browsing::SB_THREAT_TYPE_ENTERPRISE_PASSWORD_REUSE:
#if defined(SAFE_BROWSING_DB_LOCAL)
        if (safe_browsing::ChromePasswordProtectionService::
                ShouldShowPasswordReusePageInfoBubble(
                    web_contents(),
                    safe_browsing::LoginReputationClientRequest::
                        PasswordReuseEvent::ENTERPRISE_PASSWORD)) {
          return security_state::
              MALICIOUS_CONTENT_STATUS_ENTERPRISE_PASSWORD_REUSE;
        }
        // If user has already changed Gaia password, returns the regular
        // social engineering content status.
        return security_state::MALICIOUS_CONTENT_STATUS_SOCIAL_ENGINEERING;
#endif
      case safe_browsing::
          DEPRECATED_SB_THREAT_TYPE_URL_PASSWORD_PROTECTION_PHISHING:
      case safe_browsing::SB_THREAT_TYPE_URL_BINARY_MALWARE:
      case safe_browsing::SB_THREAT_TYPE_EXTENSION:
      case safe_browsing::SB_THREAT_TYPE_BLACKLISTED_RESOURCE:
      case safe_browsing::SB_THREAT_TYPE_API_ABUSE:
      case safe_browsing::SB_THREAT_TYPE_SUBRESOURCE_FILTER:
      case safe_browsing::SB_THREAT_TYPE_CSD_WHITELIST:
      case safe_browsing::SB_THREAT_TYPE_AD_SAMPLE:
      case safe_browsing::SB_THREAT_TYPE_SUSPICIOUS_SITE:
        // These threat types are not currently associated with
        // interstitials, and thus resources with these threat types are
        // not ever whitelisted or pending whitelisting.
        NOTREACHED();
        break;
    }
  }
  return security_state::MALICIOUS_CONTENT_STATUS_NONE;
}

std::unique_ptr<security_state::VisibleSecurityState>
SecurityStateTabHelper::GetVisibleSecurityState() const {
  auto state = security_state::GetVisibleSecurityState(web_contents());

  // Malware status might already be known even if connection security
  // information is still being initialized, thus no need to check for that.
  state->malicious_content_status = GetMaliciousContentStatus();

  state->is_incognito = is_incognito_;

  return state;
}