chrome/browser/first_run/upgrade_util_win.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 "chrome/browser/first_run/upgrade_util.h"

#include <windows.h>
#include <objbase.h>
#include <psapi.h>
#include <shellapi.h>
#include <wrl/client.h>

#include <algorithm>
#include <ios>
#include <string>

#include "base/base_paths.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/process/launch.h"
#include "base/process/process_handle.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/win/registry.h"
#include "base/win/windows_version.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/first_run/upgrade_util_win.h"
#include "chrome/browser/shell_integration.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "chrome/install_static/install_util.h"
#include "chrome/installer/util/google_update_constants.h"
#include "chrome/installer/util/util_constants.h"
#include "components/prefs/pref_service.h"
#include "ui/base/ui_base_switches.h"

#if defined(GOOGLE_CHROME_BUILD)
#include "google_update/google_update_idl.h"
#endif

namespace {

bool GetNewerChromeFile(base::FilePath* path) {
  if (!base::PathService::Get(base::DIR_EXE, path))
    return false;
  *path = path->Append(installer::kChromeNewExe);
  return true;
}

bool InvokeGoogleUpdateForRename() {
#if defined(GOOGLE_CHROME_BUILD)
  Microsoft::WRL::ComPtr<IProcessLauncher> ipl;
  HRESULT hr = ::CoCreateInstance(__uuidof(ProcessLauncherClass), nullptr,
                                  CLSCTX_ALL, IID_PPV_ARGS(&ipl));
  if (FAILED(hr)) {
    LOG(ERROR) << "CoCreate ProcessLauncherClass failed; hr = " << std::hex
               << hr;
    return false;
  }

  ULONG_PTR process_handle;
  hr = ipl->LaunchCmdElevated(install_static::GetAppGuid(),
                              google_update::kRegRenameCmdField,
                              ::GetCurrentProcessId(), &process_handle);
  if (FAILED(hr)) {
    LOG(ERROR) << "IProcessLauncher::LaunchCmdElevated failed; hr = "
               << std::hex << hr;
    return false;
  }

  base::Process rename_process(
      reinterpret_cast<base::ProcessHandle>(process_handle));
  int exit_code;
  if (!rename_process.WaitForExit(&exit_code)) {
    PLOG(ERROR) << "WaitForExit of rename process failed";
    return false;
  }

  if (exit_code != installer::RENAME_SUCCESSFUL) {
    LOG(ERROR) << "Rename process failed with exit code " << exit_code;
    return false;
  }

  return true;
#else   // GOOGLE_CHROME_BUILD
  return false;
#endif  // GOOGLE_CHROME_BUILD
}

}  // namespace

namespace upgrade_util {

bool RelaunchChromeBrowserImpl(const base::CommandLine& command_line) {
  base::FilePath chrome_exe;
  if (!base::PathService::Get(base::FILE_EXE, &chrome_exe)) {
    NOTREACHED();
    return false;
  }

  // Explicitly make sure to relaunch chrome.exe rather than old_chrome.exe.
  // This can happen when old_chrome.exe is launched by a user.
  base::CommandLine chrome_exe_command_line = command_line;
  chrome_exe_command_line.SetProgram(
      chrome_exe.DirName().Append(installer::kChromeExe));

  // Set the working directory to the exe's directory. This avoids a handle to
  // the version directory being kept open in the relaunched child process.
  base::LaunchOptions launch_options;
  launch_options.current_directory = chrome_exe.DirName();
  // Give the new process the right to bring its windows to the foreground.
  launch_options.grant_foreground_privilege = true;
  return base::LaunchProcess(chrome_exe_command_line, launch_options).IsValid();
}

bool IsUpdatePendingRestart() {
  base::FilePath new_chrome_exe;
  if (!GetNewerChromeFile(&new_chrome_exe))
    return false;
  return base::PathExists(new_chrome_exe);
}

bool SwapNewChromeExeIfPresent() {
  if (!IsUpdatePendingRestart())
    return false;

  // If this is a system-level install, ask Google Update to launch an elevated
  // process to rename Chrome executables.
  if (install_static::IsSystemInstall())
    return InvokeGoogleUpdateForRename();

  // If this is a user-level install, directly launch a process to rename Chrome
  // executables. Obtain the command to launch the process from the registry.
  base::win::RegKey key;
  auto result =
      key.Open(HKEY_CURRENT_USER, install_static::GetClientsKeyPath().c_str(),
               KEY_QUERY_VALUE | KEY_WOW64_32KEY);
  if (result != ERROR_SUCCESS) {
    ::SetLastError(result);
    PLOG(ERROR) << "Open Clients key failed";
    return false;
  }

  std::wstring rename_cmd;
  result = key.ReadValue(google_update::kRegRenameCmdField, &rename_cmd);
  if (result != ERROR_SUCCESS) {
    ::SetLastError(result);
    PLOG(ERROR) << "Read rename command failed";
    return false;
  }

  base::LaunchOptions options;
  options.wait = true;
  options.start_hidden = true;
  ::SetLastError(ERROR_SUCCESS);
  base::Process process = base::LaunchProcess(rename_cmd, options);
  if (!process.IsValid()) {
    PLOG(ERROR) << "Launch rename process failed";
    return false;
  }

  DWORD exit_code;
  if (!::GetExitCodeProcess(process.Handle(), &exit_code)) {
    PLOG(ERROR) << "GetExitCodeProcess of rename process failed";
    return false;
  }

  if (exit_code != installer::RENAME_SUCCESSFUL) {
    LOG(ERROR) << "Rename process failed with exit code " << exit_code;
    return false;
  }

  return true;
}

bool IsRunningOldChrome() {
  // This figures out the actual file name that the section containing the
  // mapped exe refers to. This is used instead of GetModuleFileName because the
  // .exe may have been renamed out from under us while we've been running which
  // GetModuleFileName won't notice.
  wchar_t mapped_file_name[MAX_PATH * 2] = {};

  if (!::GetMappedFileName(::GetCurrentProcess(),
                           reinterpret_cast<void*>(::GetModuleHandle(NULL)),
                           mapped_file_name, base::size(mapped_file_name))) {
    return false;
  }

  base::FilePath file_name(base::FilePath(mapped_file_name).BaseName());
  return base::FilePath::CompareEqualIgnoreCase(file_name.value(),
                                                installer::kChromeOldExe);
}

bool DoUpgradeTasks(const base::CommandLine& command_line) {
  if (!SwapNewChromeExeIfPresent() && !IsRunningOldChrome())
    return false;
  // At this point the chrome.exe has been swapped with the new one.
  if (!RelaunchChromeBrowser(command_line)) {
    // The re-launch fails. Feel free to panic now.
    NOTREACHED();
  }
  return true;
}

}  // namespace upgrade_util