chrome/browser/prefs/incognito_mode_prefs.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/prefs/incognito_mode_prefs.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "base/metrics/histogram_macros.h"
  10 #include "base/prefs/pref_service.h"
  11 #include "base/threading/thread_restrictions.h"
  12 #include "base/time/time.h"
  13 #include "chrome/browser/profiles/profile.h"
  14 #include "chrome/common/chrome_switches.h"
  15 #include "chrome/common/pref_names.h"
  16 #include "components/pref_registry/pref_registry_syncable.h"
  17 #include "content/public/browser/browser_thread.h"
  18
  19 #if defined(OS_WIN)
  20 #include <windows.h>
  21 #include <wpcapi.h>
  22 #include "base/bind.h"
  23 #include "base/bind_helpers.h"
  24 #include "base/memory/singleton.h"
  25 #include "base/win/scoped_comptr.h"
  26 #include "base/win/windows_version.h"
  27 #endif  // OS_WIN
  28
  29 #if defined(OS_ANDROID)
  30 #include "chrome/browser/android/chrome_application.h"
  31 #endif  // OS_ANDROID
  32
  33 using content::BrowserThread;
  34
  35 #if defined(OS_WIN)
  36 namespace {
  37
  38 // This singleton allows us to attempt to calculate the Platform Parental
  39 // Controls enabled value on a worker thread before the UI thread needs the
  40 // value. If the UI thread finishes sooner than we expect, that's no worse than
  41 // today where we block.
  42 class PlatformParentalControlsValue {
  43  public:
  44   static PlatformParentalControlsValue* GetInstance() {
  45     return base::Singleton<PlatformParentalControlsValue>::get();
  46   }
  47
  48   bool is_enabled() const {
  49     return is_enabled_;
  50   }
  51
  52  private:
  53   friend struct base::DefaultSingletonTraits<PlatformParentalControlsValue>;
  54
  55   // Histogram enum for tracking the thread that checked parental controls.
  56   enum class ThreadType {
  57     UI = 0,
  58     BLOCKING,
  59     COUNT,
  60   };
  61
  62   PlatformParentalControlsValue()
  63       : is_enabled_(IsParentalControlActivityLoggingOn()) {}
  64
  65   ~PlatformParentalControlsValue() = default;
  66
  67   // Returns true if Windows Parental control activity logging is enabled. This
  68   // feature is available on Windows 7 and beyond. This function should be
  69   // called on a COM Initialized thread and is potentially blocking.
  70   static bool IsParentalControlActivityLoggingOn() {
  71     // Since we can potentially block, make sure the thread is okay with this.
  72     base::ThreadRestrictions::AssertIOAllowed();
  73     base::ThreadRestrictions::AssertWaitAllowed();
  74
  75     // Query this info on Windows 7 and above.
  76     if (base::win::GetVersion() < base::win::VERSION_WIN7)
  77       return false;
  78
  79     ThreadType thread_type = ThreadType::BLOCKING;
  80     if (BrowserThread::IsThreadInitialized(BrowserThread::UI) &&
  81         content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)) {
  82       thread_type = ThreadType::UI;
  83     }
  84
  85     UMA_HISTOGRAM_ENUMERATION(
  86         "IncognitoModePrefs.WindowsParentalControlsInitThread",
  87         static_cast<int32_t>(thread_type),
  88         static_cast<int32_t>(ThreadType::COUNT));
  89
  90     base::Time begin_time = base::Time::Now();
  91     bool result = IsParentalControlActivityLoggingOnImpl();
  92     UMA_HISTOGRAM_TIMES("IncognitoModePrefs.WindowsParentalControlsInitTime",
  93                         base::Time::Now() - begin_time);
  94     return result;
  95   }
  96
  97   // Does the work of determining if Windows Parental control activity logging
  98   // is enabled.
  99   static bool IsParentalControlActivityLoggingOnImpl() {
 100     base::win::ScopedComPtr<IWindowsParentalControlsCore> parent_controls;
 101     HRESULT hr = parent_controls.CreateInstance(
 102         __uuidof(WindowsParentalControls));
 103     if (FAILED(hr))
 104       return false;
 105
 106     base::win::ScopedComPtr<IWPCSettings> settings;
 107     hr = parent_controls->GetUserSettings(nullptr, settings.Receive());
 108     if (FAILED(hr))
 109       return false;
 110
 111     unsigned long restrictions = 0;
 112     settings->GetRestrictions(&restrictions);
 113
 114     return (restrictions & WPCFLAG_LOGGING_REQUIRED) ==
 115         WPCFLAG_LOGGING_REQUIRED;
 116   }
 117
 118   const bool is_enabled_;
 119
 120   DISALLOW_COPY_AND_ASSIGN(PlatformParentalControlsValue);
 121 };
 122
 123 }  // namespace
 124 #endif  // OS_WIN
 125
 126 // static
 127 bool IncognitoModePrefs::IntToAvailability(int in_value,
 128                                            Availability* out_value) {
 129   if (in_value < 0 || in_value >= AVAILABILITY_NUM_TYPES) {
 130     *out_value = ENABLED;
 131     return false;
 132   }
 133   *out_value = static_cast<Availability>(in_value);
 134   return true;
 135 }
 136
 137 // static
 138 IncognitoModePrefs::Availability IncognitoModePrefs::GetAvailability(
 139     const PrefService* pref_service) {
 140   DCHECK(pref_service);
 141   int pref_value = pref_service->GetInteger(prefs::kIncognitoModeAvailability);
 142   Availability result = IncognitoModePrefs::ENABLED;
 143   bool valid = IntToAvailability(pref_value, &result);
 144   DCHECK(valid);
 145   if (ArePlatformParentalControlsEnabled()) {
 146     if (result == IncognitoModePrefs::FORCED)
 147       LOG(ERROR) << "Ignoring FORCED incognito. Parental control logging on";
 148     return IncognitoModePrefs::DISABLED;
 149   }
 150   return result;
 151 }
 152
 153 // static
 154 void IncognitoModePrefs::SetAvailability(PrefService* prefs,
 155                                          const Availability availability) {
 156   prefs->SetInteger(prefs::kIncognitoModeAvailability, availability);
 157 }
 158
 159 // static
 160 void IncognitoModePrefs::RegisterProfilePrefs(
 161     user_prefs::PrefRegistrySyncable* registry) {
 162   registry->RegisterIntegerPref(prefs::kIncognitoModeAvailability,
 163                                 IncognitoModePrefs::ENABLED);
 164 }
 165
 166 // static
 167 bool IncognitoModePrefs::ShouldLaunchIncognito(
 168     const base::CommandLine& command_line,
 169     const PrefService* prefs) {
 170   Availability incognito_avail = GetAvailability(prefs);
 171   return incognito_avail != IncognitoModePrefs::DISABLED &&
 172          (command_line.HasSwitch(switches::kIncognito) ||
 173           incognito_avail == IncognitoModePrefs::FORCED);
 174 }
 175
 176 // static
 177 bool IncognitoModePrefs::CanOpenBrowser(Profile* profile) {
 178   if (profile->IsGuestSession())
 179     return true;
 180
 181   switch (GetAvailability(profile->GetPrefs())) {
 182     case IncognitoModePrefs::ENABLED:
 183       return true;
 184
 185     case IncognitoModePrefs::DISABLED:
 186       return !profile->IsOffTheRecord();
 187
 188     case IncognitoModePrefs::FORCED:
 189       return profile->IsOffTheRecord();
 190
 191     default:
 192       NOTREACHED();
 193       return false;
 194   }
 195 }
 196
 197 #if defined(OS_WIN)
 198 // static
 199 void IncognitoModePrefs::InitializePlatformParentalControls() {
 200   content::BrowserThread::PostBlockingPoolTask(
 201       FROM_HERE,
 202       base::Bind(
 203           base::IgnoreResult(&PlatformParentalControlsValue::GetInstance)));
 204 }
 205 #endif
 206
 207 // static
 208 bool IncognitoModePrefs::ArePlatformParentalControlsEnabled() {
 209 #if defined(OS_WIN)
 210   return PlatformParentalControlsValue::GetInstance()->is_enabled();
 211 #elif defined(OS_ANDROID)
 212   return chrome::android::ChromeApplication::AreParentalControlsEnabled();
 213 #else
 214   return false;
 215 #endif
 216 }
 217