Hotword: Fix more accessibility issues.

[chromium-blink-merge.git] / base / win / win_util.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 "base/win/win_util.h"

#include <aclapi.h>
#include <cfgmgr32.h>
#include <lm.h>
#include <powrprof.h>
#include <shellapi.h>
#include <shlobj.h>
#include <shobjidl.h>  // Must be before propkey.
#include <initguid.h>
#include <propkey.h>
#include <propvarutil.h>
#include <sddl.h>
#include <setupapi.h>
#include <signal.h>
#include <stdlib.h>

#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_restrictions.h"
#include "base/win/metro.h"
#include "base/win/registry.h"
#include "base/win/scoped_co_mem.h"
#include "base/win/scoped_handle.h"
#include "base/win/scoped_propvariant.h"
#include "base/win/windows_version.h"

namespace {

// Sets the value of |property_key| to |property_value| in |property_store|.
bool SetPropVariantValueForPropertyStore(
    IPropertyStore* property_store,
    const PROPERTYKEY& property_key,
    const base::win::ScopedPropVariant& property_value) {
  DCHECK(property_store);

  HRESULT result = property_store->SetValue(property_key, property_value.get());
  if (result == S_OK)
    result = property_store->Commit();
  return SUCCEEDED(result);
}

void __cdecl ForceCrashOnSigAbort(int) {
  *((int*)0) = 0x1337;
}

const wchar_t kWindows8OSKRegPath[] =
    L"Software\\Classes\\CLSID\\{054AAE20-4BEA-4347-8A35-64A533254A9D}"
    L"\\LocalServer32";

// Returns true if a physical keyboard is detected on Windows 8 and up.
// Uses the Setup APIs to enumerate the attached keyboards and returns true
// if the keyboard count is more than 1. While this will work in most cases
// it won't work if there are devices which expose keyboard interfaces which
// are attached to the machine.
bool IsKeyboardPresentOnSlate() {
  // This function is only supported for Windows 8 and up.
  DCHECK(base::win::GetVersion() >= base::win::VERSION_WIN8);

  // This function should be only invoked for machines with touch screens.
  if ((GetSystemMetrics(SM_DIGITIZER) & NID_INTEGRATED_TOUCH)
        != NID_INTEGRATED_TOUCH) {
    return true;
  }

  const GUID KEYBOARD_CLASS_GUID =
      { 0x4D36E96B, 0xE325,  0x11CE,
          { 0xBF, 0xC1, 0x08, 0x00, 0x2B, 0xE1, 0x03, 0x18 } };

  // Query for all the keyboard devices.
  HDEVINFO device_info =
      SetupDiGetClassDevs(&KEYBOARD_CLASS_GUID, NULL, NULL, DIGCF_PRESENT);
  if (device_info == INVALID_HANDLE_VALUE)
    return false;

  // Enumerate all keyboards and look for ACPI\PNP and HID\VID devices. If
  // the count is more than 1 we assume that a keyboard is present. This is
  // under the assumption that there will always be one keyboard device.
  int keyboard_count = 0;
  for (DWORD i = 0;; ++i) {
    SP_DEVINFO_DATA device_info_data = { 0 };
    device_info_data.cbSize = sizeof(device_info_data);
    if (!SetupDiEnumDeviceInfo(device_info, i, &device_info_data))
      break;
    // Get the device ID.
    wchar_t device_id[MAX_DEVICE_ID_LEN];
    CONFIGRET status = CM_Get_Device_ID(device_info_data.DevInst,
                                        device_id,
                                        MAX_DEVICE_ID_LEN,
                                        0);
    if (status == CR_SUCCESS) {
      // To reduce the scope of the hack we only look for PNP and HID
      // keyboards.
      if (StartsWith(L"ACPI\\PNP", device_id, false) ||
          StartsWith(L"HID\\VID", device_id, false)) {
        keyboard_count++;
      }
    }
  }
  // On a Windows machine, the API's always report 1 keyboard at least
  // regardless of whether the machine has a keyboard attached or not.
  // The heuristic we are using is to check the count and return true
  // if the API's report more than one keyboard. Please note that this
  // will break for non keyboard devices which expose a keyboard PDO.
  return keyboard_count > 1;
}

}  // namespace

namespace base {
namespace win {

static bool g_crash_on_process_detach = false;

void GetNonClientMetrics(NONCLIENTMETRICS_XP* metrics) {
  DCHECK(metrics);
  metrics->cbSize = sizeof(*metrics);
  const bool success = !!SystemParametersInfo(
      SPI_GETNONCLIENTMETRICS,
      metrics->cbSize,
      reinterpret_cast<NONCLIENTMETRICS*>(metrics),
      0);
  DCHECK(success);
}

bool GetUserSidString(std::wstring* user_sid) {
  // Get the current token.
  HANDLE token = NULL;
  if (!::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &token))
    return false;
  base::win::ScopedHandle token_scoped(token);

  DWORD size = sizeof(TOKEN_USER) + SECURITY_MAX_SID_SIZE;
  scoped_ptr<BYTE[]> user_bytes(new BYTE[size]);
  TOKEN_USER* user = reinterpret_cast<TOKEN_USER*>(user_bytes.get());

  if (!::GetTokenInformation(token, TokenUser, user, size, &size))
    return false;

  if (!user->User.Sid)
    return false;

  // Convert the data to a string.
  wchar_t* sid_string;
  if (!::ConvertSidToStringSid(user->User.Sid, &sid_string))
    return false;

  *user_sid = sid_string;

  ::LocalFree(sid_string);

  return true;
}

bool IsShiftPressed() {
  return (::GetKeyState(VK_SHIFT) & 0x8000) == 0x8000;
}

bool IsCtrlPressed() {
  return (::GetKeyState(VK_CONTROL) & 0x8000) == 0x8000;
}

bool IsAltPressed() {
  return (::GetKeyState(VK_MENU) & 0x8000) == 0x8000;
}

bool IsAltGrPressed() {
  return (::GetKeyState(VK_MENU) & 0x8000) == 0x8000 &&
      (::GetKeyState(VK_CONTROL) & 0x8000) == 0x8000;
}

bool UserAccountControlIsEnabled() {
  // This can be slow if Windows ends up going to disk.  Should watch this key
  // for changes and only read it once, preferably on the file thread.
  //   http://code.google.com/p/chromium/issues/detail?id=61644
  base::ThreadRestrictions::ScopedAllowIO allow_io;

  base::win::RegKey key(HKEY_LOCAL_MACHINE,
      L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System",
      KEY_READ);
  DWORD uac_enabled;
  if (key.ReadValueDW(L"EnableLUA", &uac_enabled) != ERROR_SUCCESS)
    return true;
  // Users can set the EnableLUA value to something arbitrary, like 2, which
  // Vista will treat as UAC enabled, so we make sure it is not set to 0.
  return (uac_enabled != 0);
}

bool SetBooleanValueForPropertyStore(IPropertyStore* property_store,
                                     const PROPERTYKEY& property_key,
                                     bool property_bool_value) {
  ScopedPropVariant property_value;
  if (FAILED(InitPropVariantFromBoolean(property_bool_value,
                                        property_value.Receive()))) {
    return false;
  }

  return SetPropVariantValueForPropertyStore(property_store,
                                             property_key,
                                             property_value);
}

bool SetStringValueForPropertyStore(IPropertyStore* property_store,
                                    const PROPERTYKEY& property_key,
                                    const wchar_t* property_string_value) {
  ScopedPropVariant property_value;
  if (FAILED(InitPropVariantFromString(property_string_value,
                                       property_value.Receive()))) {
    return false;
  }

  return SetPropVariantValueForPropertyStore(property_store,
                                             property_key,
                                             property_value);
}

bool SetAppIdForPropertyStore(IPropertyStore* property_store,
                              const wchar_t* app_id) {
  // App id should be less than 64 chars and contain no space. And recommended
  // format is CompanyName.ProductName[.SubProduct.ProductNumber].
  // See http://msdn.microsoft.com/en-us/library/dd378459%28VS.85%29.aspx
  DCHECK(lstrlen(app_id) < 64 && wcschr(app_id, L' ') == NULL);

  return SetStringValueForPropertyStore(property_store,
                                        PKEY_AppUserModel_ID,
                                        app_id);
}

static const char16 kAutoRunKeyPath[] =
    L"Software\\Microsoft\\Windows\\CurrentVersion\\Run";

bool AddCommandToAutoRun(HKEY root_key, const string16& name,
                         const string16& command) {
  base::win::RegKey autorun_key(root_key, kAutoRunKeyPath, KEY_SET_VALUE);
  return (autorun_key.WriteValue(name.c_str(), command.c_str()) ==
      ERROR_SUCCESS);
}

bool RemoveCommandFromAutoRun(HKEY root_key, const string16& name) {
  base::win::RegKey autorun_key(root_key, kAutoRunKeyPath, KEY_SET_VALUE);
  return (autorun_key.DeleteValue(name.c_str()) == ERROR_SUCCESS);
}

bool ReadCommandFromAutoRun(HKEY root_key,
                            const string16& name,
                            string16* command) {
  base::win::RegKey autorun_key(root_key, kAutoRunKeyPath, KEY_QUERY_VALUE);
  return (autorun_key.ReadValue(name.c_str(), command) == ERROR_SUCCESS);
}

void SetShouldCrashOnProcessDetach(bool crash) {
  g_crash_on_process_detach = crash;
}

bool ShouldCrashOnProcessDetach() {
  return g_crash_on_process_detach;
}

void SetAbortBehaviorForCrashReporting() {
  // Prevent CRT's abort code from prompting a dialog or trying to "report" it.
  // Disabling the _CALL_REPORTFAULT behavior is important since otherwise it
  // has the sideffect of clearing our exception filter, which means we
  // don't get any crash.
  _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);

  // Set a SIGABRT handler for good measure. We will crash even if the default
  // is left in place, however this allows us to crash earlier. And it also
  // lets us crash in response to code which might directly call raise(SIGABRT)
  signal(SIGABRT, ForceCrashOnSigAbort);
}

bool IsTabletDevice() {
  if (GetSystemMetrics(SM_MAXIMUMTOUCHES) == 0)
    return false;

  base::win::Version version = base::win::GetVersion();
  if (version == base::win::VERSION_XP)
    return (GetSystemMetrics(SM_TABLETPC) != 0);

  // If the device is docked, the user is treating the device as a PC.
  if (GetSystemMetrics(SM_SYSTEMDOCKED) != 0)
    return false;

  // PlatformRoleSlate was only added in Windows 8, but prior to Win8 it is
  // still possible to check for a mobile power profile.
  POWER_PLATFORM_ROLE role = PowerDeterminePlatformRole();
  bool mobile_power_profile = (role == PlatformRoleMobile);
  bool slate_power_profile = false;
  if (version >= base::win::VERSION_WIN8)
    slate_power_profile = (role == PlatformRoleSlate);

  if (mobile_power_profile || slate_power_profile)
    return (GetSystemMetrics(SM_CONVERTIBLESLATEMODE) == 0);

  return false;
}

bool DisplayVirtualKeyboard() {
  if (base::win::GetVersion() < base::win::VERSION_WIN8)
    return false;

  if (IsKeyboardPresentOnSlate())
    return false;

  static base::LazyInstance<string16>::Leaky osk_path =
      LAZY_INSTANCE_INITIALIZER;

  if (osk_path.Get().empty()) {
    // We need to launch TabTip.exe from the location specified under the
    // LocalServer32 key for the {{054AAE20-4BEA-4347-8A35-64A533254A9D}}
    // CLSID.
    // TabTip.exe is typically found at
    // c:\program files\common files\microsoft shared\ink on English Windows.
    // We don't want to launch TabTip.exe from
    // c:\program files (x86)\common files\microsoft shared\ink. This path is
    // normally found on 64 bit Windows.
    base::win::RegKey key(HKEY_LOCAL_MACHINE,
                          kWindows8OSKRegPath,
                          KEY_READ | KEY_WOW64_64KEY);
    DWORD osk_path_length = 1024;
    if (key.ReadValue(NULL,
                      WriteInto(&osk_path.Get(), osk_path_length),
                      &osk_path_length,
                      NULL) != ERROR_SUCCESS) {
      DLOG(WARNING) << "Failed to read on screen keyboard path from registry";
      return false;
    }
    size_t common_program_files_offset =
        osk_path.Get().find(L"%CommonProgramFiles%");
    // Typically the path to TabTip.exe read from the registry will start with
    // %CommonProgramFiles% which needs to be replaced with the corrsponding
    // expanded string.
    // If the path does not begin with %CommonProgramFiles% we use it as is.
    if (common_program_files_offset != string16::npos) {
      // Preserve the beginning quote in the path.
      osk_path.Get().erase(common_program_files_offset,
                           wcslen(L"%CommonProgramFiles%"));
      // The path read from the registry contains the %CommonProgramFiles%
      // environment variable prefix. On 64 bit Windows the SHGetKnownFolderPath
      // function returns the common program files path with the X86 suffix for
      // the FOLDERID_ProgramFilesCommon value.
      // To get the correct path to TabTip.exe we first read the environment
      // variable CommonProgramW6432 which points to the desired common
      // files path. Failing that we fallback to the SHGetKnownFolderPath API.

      // We then replace the %CommonProgramFiles% value with the actual common
      // files path found in the process.
      string16 common_program_files_path;
      scoped_ptr<wchar_t[]> common_program_files_wow6432;
      DWORD buffer_size =
          GetEnvironmentVariable(L"CommonProgramW6432", NULL, 0);
      if (buffer_size) {
        common_program_files_wow6432.reset(new wchar_t[buffer_size]);
        GetEnvironmentVariable(L"CommonProgramW6432",
                               common_program_files_wow6432.get(),
                               buffer_size);
        common_program_files_path = common_program_files_wow6432.get();
        DCHECK(!common_program_files_path.empty());
      } else {
        base::win::ScopedCoMem<wchar_t> common_program_files;
        if (FAILED(SHGetKnownFolderPath(FOLDERID_ProgramFilesCommon, 0, NULL,
                                        &common_program_files))) {
          return false;
        }
        common_program_files_path = common_program_files;
      }

      osk_path.Get().insert(1, common_program_files_path);
    }
  }

  HINSTANCE ret = ::ShellExecuteW(NULL,
                                  L"",
                                  osk_path.Get().c_str(),
                                  NULL,
                                  NULL,
                                  SW_SHOW);
  return reinterpret_cast<int>(ret) > 32;
}

bool DismissVirtualKeyboard() {
  if (base::win::GetVersion() < base::win::VERSION_WIN8)
    return false;

  // We dismiss the virtual keyboard by generating the ESC keystroke
  // programmatically.
  const wchar_t kOSKClassName[] = L"IPTip_Main_Window";
  HWND osk = ::FindWindow(kOSKClassName, NULL);
  if (::IsWindow(osk) && ::IsWindowEnabled(osk)) {
    PostMessage(osk, WM_SYSCOMMAND, SC_CLOSE, 0);
    return true;
  }
  return false;
}

typedef HWND (*MetroRootWindow) ();

enum DomainEnrollementState {UNKNOWN = -1, NOT_ENROLLED, ENROLLED};
static volatile long int g_domain_state = UNKNOWN;

bool IsEnrolledToDomain() {
  // Doesn't make any sense to retry inside a user session because joining a
  // domain will only kick in on a restart.
  if (g_domain_state == UNKNOWN) {
    LPWSTR domain;
    NETSETUP_JOIN_STATUS join_status;
    if(::NetGetJoinInformation(NULL, &domain, &join_status) != NERR_Success)
      return false;
    ::NetApiBufferFree(domain);
    ::InterlockedCompareExchange(&g_domain_state,
                                 join_status == ::NetSetupDomainName ?
                                     ENROLLED : NOT_ENROLLED,
                                 UNKNOWN);
  }

  return g_domain_state == ENROLLED;
}

void SetDomainStateForTesting(bool state) {
  g_domain_state = state ? ENROLLED : NOT_ENROLLED;
}

bool MaybeHasSHA256Support() {
  const base::win::OSInfo* os_info = base::win::OSInfo::GetInstance();

  if (os_info->version() == base::win::VERSION_PRE_XP)
    return false;  // Too old to have it and this OS is not supported anyway.

  if (os_info->version() == base::win::VERSION_XP)
    return os_info->service_pack().major >= 3;  // Windows XP SP3 has it.

  // Assume it is missing in this case, although it may not be. This category
  // includes Windows XP x64, and Windows Server, where a hotfix could be
  // deployed.
  if (os_info->version() == base::win::VERSION_SERVER_2003)
    return false;

  DCHECK(os_info->version() >= base::win::VERSION_VISTA);
  return true;  // New enough to have SHA-256 support.
}

}  // namespace win
}  // namespace base