Add initial version of captive portal list checking.

chrome/browser/ssl/ssl_browser_tests.cc

 // Copyright (c) 2012 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 <utility>
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/histogram_tester.h"
+#include "base/test/scoped_feature_list.h"
 #include "base/test/simple_test_clock.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/default_clock.h"
 #include "base/time/default_tick_clock.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/interstitials/security_interstitial_page_test_utils.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ssl/bad_clock_blocking_page.h"
 #include "chrome/browser/ssl/cert_report_helper.h"
 #include "chrome/browser/ssl/cert_verifier_browser_test.h"
 #include "chrome/browser/ssl/certificate_reporting_test_utils.h"
 #include "chrome/browser/ssl/chrome_ssl_host_state_delegate.h"
 #include "chrome/browser/ssl/common_name_mismatch_handler.h"
 #include "chrome/browser/ssl/security_state_tab_helper.h"
 #include "chrome/browser/ssl/ssl_blocking_page.h"
+#include "chrome/browser/ssl/ssl_error_assistant.pb.h"
 #include "chrome/browser/ssl/ssl_error_handler.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_navigator_params.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 26 matching lines @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/page_state.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/download_test_observer.h"
 #include "content/public/test/test_navigation_observer.h"
 #include "content/public/test/test_renderer_host.h"
 #include "content/public/test/test_utils.h"
+#include "crypto/sha2.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
+#include "net/cert/asn1_util.h"
 #include "net/cert/cert_status_flags.h"
 #include "net/cert/mock_cert_verifier.h"
 #include "net/cert/x509_certificate.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/http/http_response_headers.h"
 #include "net/ssl/ssl_info.h"
 #include "net/test/cert_test_util.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "net/test/embedded_test_server/request_handler_util.h"
 #include "net/test/spawned_test_server/spawned_test_server.h"
 #include "net/test/test_certificate_data.h"
 #include "net/test/test_data_directory.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_filter.h"
 #include "net/url_request/url_request_job.h"
 #include "net/url_request/url_request_test_util.h"
 
+#if BUILDFLAG(ENABLE_CAPTIVE_PORTAL_DETECTION)
+#include "chrome/browser/ssl/captive_portal_blocking_page.h"
+#endif
+
 #if defined(USE_NSS_CERTS)
 #include "chrome/browser/net/nss_context.h"
 #include "net/base/crypto_module.h"
 #include "net/cert/nss_cert_database.h"
 #endif  // defined(USE_NSS_CERTS)
 
 using base::ASCIIToUTF16;
 using chrome_browser_interstitials::SecurityInterstitialIDNTest;
 using content::InterstitialPage;
 using content::NavigationController;
@@ skipping 102 matching lines @@
     SSLErrorHandler::SetInterstitialTimerStartedCallbackForTesting(&callback_);
   }
 
   ~SSLInterstitialTimerObserver() {
     SSLErrorHandler::SetInterstitialTimerStartedCallbackForTesting(nullptr);
   }
 
   // Waits until the interstitial delay timer in SSLErrorHandler is started.
   void WaitForTimerStarted() { message_loop_runner_->Run(); }
 
+  // Returns true if the interstitial delay timer has been started.
+  bool timer_started() const { return timer_started_; }
+
  private:
   void OnTimerStarted(content::WebContents* web_contents) {
+    timer_started_ = true;
     if (web_contents_ == web_contents)
       message_loop_runner_->Quit();
   }
 
+  bool timer_started_ = false;
   const content::WebContents* web_contents_;
   SSLErrorHandler::TimerStartedCallback callback_;
 
   std::unique_ptr<base::RunLoop> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLInterstitialTimerObserver);
 };
 
 class HungJob : public net::URLRequestJob {
  public:
@@ skipping 21 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(FaviconFilter);
 };
 
 std::string EncodeQuery(const std::string& query) {
   url::RawCanonOutputT<char> buffer;
   url::EncodeURIComponent(query.data(), query.size(), &buffer);
   return std::string(buffer.data(), buffer.length());
 }
 
+// Returns the Sha256 hash of the SPKI of |cert|.
+net::HashValue GetSPKIHash(net::X509Certificate* cert) {
+  std::string der_data;
+  EXPECT_TRUE(
+      net::X509Certificate::GetDEREncoded(cert->os_cert_handle(), &der_data));
+  base::StringPiece der_bytes(der_data);
+  base::StringPiece spki_bytes;
+  EXPECT_TRUE(net::asn1::ExtractSPKIFromDERCert(der_bytes, &spki_bytes));
+  net::HashValue sha256(net::HASH_VALUE_SHA256);
+  crypto::SHA256HashString(spki_bytes, sha256.data(), crypto::kSHA256Length);
+  return sha256;
+}
+
 }  // namespace
 
 class SSLUITest : public InProcessBrowserTest {
  public:
   SSLUITest()
       : https_server_(net::EmbeddedTestServer::TYPE_HTTPS),
         https_server_expired_(net::EmbeddedTestServer::TYPE_HTTPS),
         https_server_mismatched_(net::EmbeddedTestServer::TYPE_HTTPS),
         wss_server_expired_(net::SpawnedTestServer::TYPE_WSS,
                             SSLOptions(SSLOptions::CERT_EXPIRED),
@@ skipping 15 matching lines @@
     // authentication state. To avoid this non-determinism, add an
     // interceptor to hang all favicon requests.
     std::unique_ptr<net::URLRequestInterceptor> interceptor(new FaviconFilter);
     net::URLRequestFilter::GetInstance()->AddHostnameInterceptor(
         "https", "127.0.0.1", std::move(interceptor));
     interceptor.reset(new FaviconFilter);
     net::URLRequestFilter::GetInstance()->AddHostnameInterceptor(
         "https", "localhost", std::move(interceptor));
   }
 
+  void SetUp() override {
+    InProcessBrowserTest::SetUp();
+    SSLErrorHandler::ResetConfigForTesting();
+  }
+
+  void TearDown() override {
+    SSLErrorHandler::ResetConfigForTesting();
+    InProcessBrowserTest::TearDown();
+  }
+
   void SetUpCommandLine(base::CommandLine* command_line) override {
     // Browser will both run and display insecure content.
     command_line->AppendSwitch(switches::kAllowRunningInsecureContent);
     // Use process-per-site so that navigating to a same-site page in a
     // new tab will use the same process.
     command_line->AppendSwitch(switches::kProcessPerSite);
   }
 
   void CheckAuthenticatedState(WebContents* tab,
                                int expected_authentication_state) {
@@ skipping 3557 matching lines @@
 IN_PROC_BROWSER_TEST_F(SSLUITestIgnoreLocalhostCertErrors,
                        NoCrashOnLoadWithNoNavigationEntry) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(
       browser(), embedded_test_server()->GetURL("/ssl/google.html"));
   WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
   ASSERT_TRUE(content::ExecuteScript(tab, "window.open()"));
 }
 
+// Put captive portal related tests under a different namespace for nicer
+// pattern matching.
+using SSLUICaptivePortalListTest = SSLUITest;
+
+#if BUILDFLAG(ENABLE_CAPTIVE_PORTAL_DETECTION)
+
+// Tests that the captive portal certificate list is not used when the feature
+// is disabled via Finch. The list is passed to SSLErrorHandler via a proto.
+IN_PROC_BROWSER_TEST_F(SSLUICaptivePortalListTest,
+                       CaptivePortalCertificateList_Disabled) {
+  base::test::ScopedFeatureList scoped_feature_list;
+  // Use InitFromCommandLine instead of InitAndDisableFeature to avoid making
+  // the feature public in SSLErrorHandler header.
+  scoped_feature_list.InitFromCommandLine(
+      std::string() /* enabled */,
+      "CaptivePortalCertificateList" /* disabled */);
+
+  ASSERT_TRUE(https_server_mismatched_.Start());
+  base::HistogramTester histograms;
+
+  // Mark the server's cert as a captive portal cert.
+  const net::HashValue server_spki_hash =
+      GetSPKIHash(https_server_mismatched_.GetCertificate().get());
+  chrome_browser_ssl::SSLErrorAssistantConfig config_proto;
+  config_proto.add_captive_portal_cert()->set_sha256_hash(
+      server_spki_hash.ToString());
+  SSLErrorHandler::SetErrorAssistantProtoForTesting(config_proto);
+
+  // Navigate to an unsafe page on the server. A normal SSL interstitial should
+  // be displayed since CaptivePortalCertificateList feature is disabled.
+  WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
+  SSLInterstitialTimerObserver interstitial_timer_observer(tab);
+  ui_test_utils::NavigateToURL(
+      browser(), https_server_mismatched_.GetURL("/ssl/blank_page.html"));
+  content::WaitForInterstitialAttach(tab);
+
+  InterstitialPage* interstitial_page = tab->GetInterstitialPage();
+  ASSERT_EQ(SSLBlockingPage::kTypeForTesting,
+            interstitial_page->GetDelegateForTesting()->GetTypeForTesting());
+  EXPECT_TRUE(interstitial_timer_observer.timer_started());
+
+  // Check that the histogram for the SSL interstitial was recorded.
+  histograms.ExpectTotalCount(SSLErrorHandler::GetHistogramNameForTesting(), 2);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::HANDLE_ALL, 1);
+  histograms.ExpectBucketCount(
+      SSLErrorHandler::GetHistogramNameForTesting(),
+      SSLErrorHandler::SHOW_SSL_INTERSTITIAL_OVERRIDABLE, 1);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::CAPTIVE_PORTAL_CERT_FOUND, 0);
+}
+
+// Tests that the captive portal certificate list is used when the feature
+// is enabled via Finch. The list is passed to SSLErrorHandler via a proto.
+IN_PROC_BROWSER_TEST_F(SSLUICaptivePortalListTest,
+                       CaptivePortalCertificateList_Enabled_FromProto) {
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitFromCommandLine(
+      "CaptivePortalCertificateList" /* enabled */,
+      std::string() /* disabled */);
+
+  ASSERT_TRUE(https_server_mismatched_.Start());
+  base::HistogramTester histograms;
+
+  // Mark the server's cert as a captive portal cert.
+  const net::HashValue server_spki_hash =
+      GetSPKIHash(https_server_mismatched_.GetCertificate().get());
+  chrome_browser_ssl::SSLErrorAssistantConfig config_proto;
+  config_proto.add_captive_portal_cert()->set_sha256_hash(
+      server_spki_hash.ToString());
+  SSLErrorHandler::SetErrorAssistantProtoForTesting(config_proto);
+
+  // Navigate to an unsafe page on the server. The captive portal interstitial
+  // should be displayed since CaptivePortalCertificateList feature is enabled.
+  WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
+  SSLInterstitialTimerObserver interstitial_timer_observer(tab);
+  ui_test_utils::NavigateToURL(
+      browser(), https_server_mismatched_.GetURL("/ssl/blank_page.html"));
+  content::WaitForInterstitialAttach(tab);
+
+  InterstitialPage* interstitial_page = tab->GetInterstitialPage();
+  ASSERT_EQ(CaptivePortalBlockingPage::kTypeForTesting,
+            interstitial_page->GetDelegateForTesting()->GetTypeForTesting());
+  EXPECT_FALSE(interstitial_timer_observer.timer_started());
+
+  // Check that the histogram for the captive portal cert was recorded.
+  histograms.ExpectTotalCount(SSLErrorHandler::GetHistogramNameForTesting(), 3);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::HANDLE_ALL, 1);
+  histograms.ExpectBucketCount(
+      SSLErrorHandler::GetHistogramNameForTesting(),
+      SSLErrorHandler::SHOW_CAPTIVE_PORTAL_INTERSTITIAL_OVERRIDABLE, 1);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::CAPTIVE_PORTAL_CERT_FOUND, 1);
+}
+
+namespace {
+
+// Test class that mimics a URL request with a certificate whose SPKI hash is in
+// ssl_error_assistant.asciipb resource. A better way of testing the SPKI hashes
+// inside the resource bundle would be to serve the actual certificate from the
+// embedded test server, but the test server can only serve a limited number of
+// predefined certificates.
+class SSLUICaptivePortalListResourceBundleTest
+    : public CertVerifierBrowserTest {
+ public:
+  SSLUICaptivePortalListResourceBundleTest()
+      : CertVerifierBrowserTest(),
+        https_server_(net::EmbeddedTestServer::TYPE_HTTPS),
+        https_server_mismatched_(net::EmbeddedTestServer::TYPE_HTTPS) {
+    https_server_.ServeFilesFromSourceDirectory(base::FilePath(kDocRoot));
+
+    https_server_mismatched_.SetSSLConfig(
+        net::EmbeddedTestServer::CERT_MISMATCHED_NAME);
+    https_server_mismatched_.AddDefaultHandlers(base::FilePath(kDocRoot));
+  }
+
+  void SetUp() override {
+    CertVerifierBrowserTest::SetUp();
+    SSLErrorHandler::ResetConfigForTesting();
+    SetUpCertVerifier(0, net::OK);
+  }
+
+  void TearDown() override {
+    SSLErrorHandler::ResetConfigForTesting();
+    CertVerifierBrowserTest::TearDown();
+  }
+
+ protected:
+  void SetUpCertVerifier(net::CertStatus cert_status, int net_result) {
+    scoped_refptr<net::X509Certificate> cert(https_server_.GetCertificate());
+    net::CertVerifyResult verify_result;
+    verify_result.is_issued_by_known_root =
+        (net_result != net::ERR_CERT_AUTHORITY_INVALID);
+    verify_result.verified_cert = cert;
+    verify_result.cert_status = cert_status;
+
+    // Set the SPKI hash to captive-portal.badssl.com leaf certificate. This
+    // doesn't match the actual cert (ok_cert.pem) but is good enough for
+    // testing.
+    net::HashValue hash;
+    ASSERT_TRUE(
+        hash.FromString("sha256/fjZPHewEHTrMDX3I1ecEIeoy3WFxHyGplOLv28kIbtI="));
+    verify_result.public_key_hashes.push_back(hash);
+    mock_cert_verifier()->AddResultForCert(cert, verify_result, net_result);
+  }
+
+  net::EmbeddedTestServer* https_server() { return &https_server_; }
+  net::EmbeddedTestServer* https_server_mismatched() {
+    return &https_server_mismatched_;
+  }
+
+ private:
+  net::EmbeddedTestServer https_server_;
+  net::EmbeddedTestServer https_server_mismatched_;
+};
+
+}  // namespace
+
+// Same as CaptivePortalCertificateList_Enabled_FromProto, but this time the
+// cert's SPKI hash is listed in ssl_error_assistant.asciipb.
+IN_PROC_BROWSER_TEST_F(SSLUICaptivePortalListResourceBundleTest,
+                       Enabled_FromResource) {
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitFromCommandLine(
+      "CaptivePortalCertificateList" /* enabled */,
+      std::string() /* disabled */);
+  ASSERT_TRUE(https_server()->Start());
+  base::HistogramTester histograms;
+
+  // Mark the server's cert as a captive portal cert.
+  SetUpCertVerifier(net::CERT_STATUS_COMMON_NAME_INVALID,
+                    net::ERR_CERT_COMMON_NAME_INVALID);
+
+  // Navigate to an unsafe page on the server. The captive portal interstitial
+  // should be displayed since CaptivePortalCertificateList feature is enabled.
+  WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
+  SSLInterstitialTimerObserver interstitial_timer_observer(tab);
+  ui_test_utils::NavigateToURL(browser(), https_server()->GetURL("/"));
+  content::WaitForInterstitialAttach(tab);
+
+  InterstitialPage* interstitial_page = tab->GetInterstitialPage();
+  ASSERT_EQ(CaptivePortalBlockingPage::kTypeForTesting,
+            interstitial_page->GetDelegateForTesting()->GetTypeForTesting());
+  EXPECT_FALSE(interstitial_timer_observer.timer_started());
+
+  // Check that the histogram for the captive portal cert was recorded.
+  histograms.ExpectTotalCount(SSLErrorHandler::GetHistogramNameForTesting(), 3);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::HANDLE_ALL, 1);
+  histograms.ExpectBucketCount(
+      SSLErrorHandler::GetHistogramNameForTesting(),
+      SSLErrorHandler::SHOW_CAPTIVE_PORTAL_INTERSTITIAL_OVERRIDABLE, 1);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::CAPTIVE_PORTAL_CERT_FOUND, 1);
+}
+
+// Same as SSLUICaptivePortalNameMismatchTest, but this time the error is
+// authority-invalid. Captive portal interstitial should not be shown.
+IN_PROC_BROWSER_TEST_F(SSLUICaptivePortalListResourceBundleTest,
+                       Enabled_FromResource_AuthorityInvalid) {
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitFromCommandLine(
+      "CaptivePortalCertificateList" /* enabled */,
+      std::string() /* disabled */);
+  ASSERT_TRUE(https_server()->Start());
+  base::HistogramTester histograms;
+
+  // Set interstitial delay to zero.
+  SSLErrorHandler::SetInterstitialDelayForTesting(base::TimeDelta());
+  // Mark the server's cert as a captive portal cert, but with an
+  // authority-invalid error.
+  SetUpCertVerifier(net::CERT_STATUS_AUTHORITY_INVALID,
+                    net::ERR_CERT_AUTHORITY_INVALID);
+
+  // Navigate to an unsafe page on the server. CaptivePortalCertificateList
+  // feature is enabled but the error is not a name mismatch, so a generic SSL
+  // interstitial should be displayed.
+  WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
+  SSLInterstitialTimerObserver interstitial_timer_observer(tab);
+  ui_test_utils::NavigateToURL(browser(), https_server()->GetURL("/"));
+  content::WaitForInterstitialAttach(tab);
+
+  InterstitialPage* interstitial_page = tab->GetInterstitialPage();
+  ASSERT_EQ(SSLBlockingPage::kTypeForTesting,
+            interstitial_page->GetDelegateForTesting()->GetTypeForTesting());
+  EXPECT_TRUE(interstitial_timer_observer.timer_started());
+
+  // Check that the histogram for the captive portal cert was recorded.
+  histograms.ExpectTotalCount(SSLErrorHandler::GetHistogramNameForTesting(), 2);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::HANDLE_ALL, 1);
+  histograms.ExpectBucketCount(
+      SSLErrorHandler::GetHistogramNameForTesting(),
+      SSLErrorHandler::SHOW_SSL_INTERSTITIAL_OVERRIDABLE, 1);
+}
+
+#else
+
+// Tests that the captive portal certificate list is not used when captive
+// portal checks are disabled by build, even if the captive portal certificate
+// list feature is enabled via Finch. The list is passed to SSLErrorHandler via
+// a proto.
+IN_PROC_BROWSER_TEST_F(SSLUICaptivePortalListTest, PortalChecksDisabled) {
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitFromCommandLine(
+      "CaptivePortalCertificateList" /* enabled */,
+      std::string() /* disabled */);
+
+  ASSERT_TRUE(https_server_mismatched_.Start());
+  base::HistogramTester histograms;
+
+  // Mark the server's cert as a captive portal cert.
+  const net::HashValue server_spki_hash =
+      GetSPKIHash(https_server_mismatched_.GetCertificate().get());
+  chrome_browser_ssl::SSLErrorAssistantConfig config_proto;
+  config_proto.add_captive_portal_cert()->set_sha256_hash(
+      server_spki_hash.ToString());
+  SSLErrorHandler::SetErrorAssistantProtoForTesting(config_proto);
+
+  // Navigate to an unsafe page on the server. The captive portal interstitial
+  // should be displayed since CaptivePortalCertificateList feature is enabled.
+  WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
+  SSLInterstitialTimerObserver interstitial_timer_observer(tab);
+  ui_test_utils::NavigateToURL(
+      browser(), https_server_mismatched_.GetURL("/ssl/blank_page.html"));
+  content::WaitForInterstitialAttach(tab);
+
+  InterstitialPage* interstitial_page = tab->GetInterstitialPage();
+  ASSERT_EQ(SSLBlockingPage::kTypeForTesting,
+            interstitial_page->GetDelegateForTesting()->GetTypeForTesting());
+  EXPECT_FALSE(interstitial_timer_observer.timer_started());
+
+  // Check that the histogram for the captive portal cert was recorded.
+  histograms.ExpectTotalCount(SSLErrorHandler::GetHistogramNameForTesting(), 2);
+  histograms.ExpectBucketCount(SSLErrorHandler::GetHistogramNameForTesting(),
+                               SSLErrorHandler::HANDLE_ALL, 1);
+  histograms.ExpectBucketCount(
+      SSLErrorHandler::GetHistogramNameForTesting(),
+      SSLErrorHandler::SHOW_SSL_INTERSTITIAL_OVERRIDABLE, 1);
+}
+
+#endif  // BUILDFLAG(ENABLE_CAPTIVE_PORTAL_DETECTION)
+
 // TODO(jcampan): more tests to do below.
 
 // Visit a page over https that contains a frame with a redirect.
 
 // XMLHttpRequest insecure content in synchronous mode.
 
 // XMLHttpRequest insecure content in asynchronous mode.
 
 // XMLHttpRequest over bad ssl in synchronous mode.
 
 // XMLHttpRequest over OK ssl in synchronous mode.