remoting/host/setup/me2me_native_messaging_host_main.cc

   1 // Copyright 2013 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 "remoting/host/setup/me2me_native_messaging_host_main.h"
   6
   7 #include "base/at_exit.h"
   8 #include "base/command_line.h"
   9 #include "base/files/file.h"
  10 #include "base/i18n/icu_util.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/run_loop.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/threading/thread.h"
  15 #include "net/url_request/url_fetcher.h"
  16 #include "remoting/base/breakpad.h"
  17 #include "remoting/base/url_request_context_getter.h"
  18 #include "remoting/host/host_exit_codes.h"
  19 #include "remoting/host/logging.h"
  20 #include "remoting/host/native_messaging/pipe_messaging_channel.h"
  21 #include "remoting/host/pairing_registry_delegate.h"
  22 #include "remoting/host/setup/me2me_native_messaging_host.h"
  23 #include "remoting/host/usage_stats_consent.h"
  24
  25 #if defined(OS_MACOSX)
  26 #include "base/mac/scoped_nsautorelease_pool.h"
  27 #endif  // defined(OS_MACOSX)
  28
  29 #if defined(OS_WIN)
  30 #include "base/win/registry.h"
  31 #include "base/win/windows_version.h"
  32 #include "remoting/host/pairing_registry_delegate_win.h"
  33 #endif  // defined(OS_WIN)
  34
  35 #if defined(OS_LINUX)
  36 #include <glib-object.h>
  37 #endif  // defined(OS_LINUX)
  38
  39 using remoting::protocol::PairingRegistry;
  40
  41 namespace {
  42
  43 const char kParentWindowSwitchName[] = "parent-window";
  44
  45 }  // namespace
  46
  47 namespace remoting {
  48
  49 #if defined(OS_WIN)
  50 bool IsProcessElevated() {
  51   // Conceptually, all processes running on a pre-VISTA version of Windows can
  52   // be considered "elevated".
  53   if (base::win::GetVersion() < base::win::VERSION_VISTA)
  54     return true;
  55
  56   HANDLE process_token;
  57   OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &process_token);
  58
  59   base::win::ScopedHandle scoped_process_token(process_token);
  60
  61   // Unlike TOKEN_ELEVATION_TYPE which returns TokenElevationTypeDefault when
  62   // UAC is turned off, TOKEN_ELEVATION will tell you the process is elevated.
  63   DWORD size;
  64   TOKEN_ELEVATION elevation;
  65   GetTokenInformation(process_token, TokenElevation,
  66                       &elevation, sizeof(elevation), &size);
  67   return elevation.TokenIsElevated != 0;
  68 }
  69 #endif  // defined(OS_WIN)
  70
  71 int StartMe2MeNativeMessagingHost() {
  72 #if defined(OS_MACOSX)
  73   // Needed so we don't leak objects when threads are created.
  74   base::mac::ScopedNSAutoreleasePool pool;
  75 #endif  // defined(OS_MACOSX)
  76
  77 #if defined(OS_LINUX)
  78 // g_type_init will be deprecated in 2.36. 2.35 is the development
  79 // version for 2.36, hence do not call g_type_init starting 2.35.
  80 // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
  81 #if !GLIB_CHECK_VERSION(2, 35, 0)
  82   g_type_init();
  83 #endif
  84 #endif  // defined(OS_LINUX)
  85
  86   // Required to find the ICU data file, used by some file_util routines.
  87   base::i18n::InitializeICU();
  88
  89 #if defined(REMOTING_ENABLE_BREAKPAD)
  90   // Initialize Breakpad as early as possible. On Mac the command-line needs to
  91   // be initialized first, so that the preference for crash-reporting can be
  92   // looked up in the config file.
  93   if (IsUsageStatsAllowed()) {
  94     InitializeCrashReporting();
  95   }
  96 #endif  // defined(REMOTING_ENABLE_BREAKPAD)
  97
  98   // Mac OS X requires that the main thread be a UI message loop in order to
  99   // receive distributed notifications from the System Preferences pane. An
 100   // IO thread is needed for the pairing registry and URL context getter.
 101   base::Thread io_thread("io_thread");
 102   io_thread.StartWithOptions(
 103       base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
 104
 105   base::Thread file_thread("file_thread");
 106   file_thread.StartWithOptions(
 107       base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
 108
 109   base::MessageLoopForUI message_loop;
 110   base::RunLoop run_loop;
 111
 112   scoped_refptr<DaemonController> daemon_controller =
 113       DaemonController::Create();
 114
 115   // Pass handle of the native view to the controller so that the UAC prompts
 116   // are focused properly.
 117   const base::CommandLine* command_line =
 118       base::CommandLine::ForCurrentProcess();
 119   int64 native_view_handle = 0;
 120   if (command_line->HasSwitch(kParentWindowSwitchName)) {
 121     std::string native_view =
 122         command_line->GetSwitchValueASCII(kParentWindowSwitchName);
 123     if (!base::StringToInt64(native_view, &native_view_handle)) {
 124       LOG(WARNING) << "Invalid parameter value --" << kParentWindowSwitchName
 125                    << "=" << native_view;
 126     }
 127   }
 128
 129   base::File read_file;
 130   base::File write_file;
 131   bool needs_elevation = false;
 132
 133 #if defined(OS_WIN)
 134   needs_elevation = !IsProcessElevated();
 135
 136   if (command_line->HasSwitch(kElevatingSwitchName)) {
 137     DCHECK(!needs_elevation);
 138
 139     // The "elevate" switch is always accompanied by the "input" and "output"
 140     // switches whose values name named pipes that should be used in place of
 141     // stdin and stdout.
 142     DCHECK(command_line->HasSwitch(kInputSwitchName));
 143     DCHECK(command_line->HasSwitch(kOutputSwitchName));
 144
 145     // presubmit: allow wstring
 146     std::wstring input_pipe_name =
 147       command_line->GetSwitchValueNative(kInputSwitchName);
 148     // presubmit: allow wstring
 149     std::wstring output_pipe_name =
 150       command_line->GetSwitchValueNative(kOutputSwitchName);
 151
 152     // A NULL SECURITY_ATTRIBUTES signifies that the handle can't be inherited.
 153     read_file =
 154         base::File(CreateFile(input_pipe_name.c_str(), GENERIC_READ, 0, nullptr,
 155                               OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr));
 156     if (!read_file.IsValid()) {
 157       PLOG(ERROR) << "CreateFile failed on '" << input_pipe_name << "'";
 158       return kInitializationFailed;
 159     }
 160
 161     write_file = base::File(CreateFile(
 162         output_pipe_name.c_str(), GENERIC_WRITE, 0, nullptr, OPEN_EXISTING,
 163         FILE_ATTRIBUTE_NORMAL, nullptr));
 164     if (!write_file.IsValid()) {
 165       PLOG(ERROR) << "CreateFile failed on '" << output_pipe_name << "'";
 166       return kInitializationFailed;
 167     }
 168   } else {
 169     // GetStdHandle() returns pseudo-handles for stdin and stdout even if
 170     // the hosting executable specifies "Windows" subsystem. However the
 171     // returned handles are invalid in that case unless standard input and
 172     // output are redirected to a pipe or file.
 173     read_file = base::File(GetStdHandle(STD_INPUT_HANDLE));
 174     write_file = base::File(GetStdHandle(STD_OUTPUT_HANDLE));
 175
 176     // After the native messaging channel starts the native messaging reader
 177     // will keep doing blocking read operations on the input named pipe.
 178     // If any other thread tries to perform any operation on STDIN, it will also
 179     // block because the input named pipe is synchronous (non-overlapped).
 180     // It is pretty common for a DLL to query the device info (GetFileType) of
 181     // the STD* handles at startup. So any LoadLibrary request can potentially
 182     // be blocked. To prevent that from happening we close STDIN and STDOUT
 183     // handles as soon as we retrieve the corresponding file handles.
 184     SetStdHandle(STD_INPUT_HANDLE, nullptr);
 185     SetStdHandle(STD_OUTPUT_HANDLE, nullptr);
 186   }
 187 #elif defined(OS_POSIX)
 188   // The files will be automatically closed.
 189   read_file = base::File(STDIN_FILENO);
 190   write_file = base::File(STDOUT_FILENO);
 191 #else
 192 #error Not implemented.
 193 #endif
 194
 195   // OAuth client (for credential requests). IO thread is used for blocking
 196   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter(
 197       new URLRequestContextGetter(io_thread.task_runner(),
 198                                   file_thread.task_runner()));
 199   scoped_ptr<OAuthClient> oauth_client(
 200       new OAuthClient(url_request_context_getter));
 201
 202   net::URLFetcher::SetIgnoreCertificateRequests(true);
 203
 204   // Create the pairing registry.
 205   scoped_refptr<PairingRegistry> pairing_registry;
 206
 207 #if defined(OS_WIN)
 208   base::win::RegKey root;
 209   LONG result = root.Open(HKEY_LOCAL_MACHINE, kPairingRegistryKeyName,
 210                           KEY_READ);
 211   if (result != ERROR_SUCCESS) {
 212     SetLastError(result);
 213     PLOG(ERROR) << "Failed to open HKLM\\" << kPairingRegistryKeyName;
 214     return kInitializationFailed;
 215   }
 216
 217   base::win::RegKey unprivileged;
 218   result = unprivileged.Open(root.Handle(), kPairingRegistryClientsKeyName,
 219                              needs_elevation ? KEY_READ : KEY_READ | KEY_WRITE);
 220   if (result != ERROR_SUCCESS) {
 221     SetLastError(result);
 222     PLOG(ERROR) << "Failed to open HKLM\\" << kPairingRegistryKeyName
 223                 << "\\" << kPairingRegistryClientsKeyName;
 224     return kInitializationFailed;
 225   }
 226
 227   // Only try to open the privileged key if the current process is elevated.
 228   base::win::RegKey privileged;
 229   if (!needs_elevation) {
 230     result = privileged.Open(root.Handle(), kPairingRegistrySecretsKeyName,
 231                              KEY_READ | KEY_WRITE);
 232     if (result != ERROR_SUCCESS) {
 233       SetLastError(result);
 234       PLOG(ERROR) << "Failed to open HKLM\\" << kPairingRegistryKeyName << "\\"
 235                   << kPairingRegistrySecretsKeyName;
 236       return kInitializationFailed;
 237     }
 238   }
 239
 240   // Initialize the pairing registry delegate and set the root keys.
 241   scoped_ptr<PairingRegistryDelegateWin> delegate(
 242       new PairingRegistryDelegateWin());
 243   if (!delegate->SetRootKeys(privileged.Take(), unprivileged.Take()))
 244     return kInitializationFailed;
 245
 246   pairing_registry =
 247       new PairingRegistry(io_thread.task_runner(), delegate.Pass());
 248 #else  // defined(OS_WIN)
 249   pairing_registry =
 250       CreatePairingRegistry(io_thread.task_runner());
 251 #endif  // !defined(OS_WIN)
 252
 253   // Set up the native messaging channel.
 254   scoped_ptr<extensions::NativeMessagingChannel> channel(
 255       new PipeMessagingChannel(read_file.Pass(), write_file.Pass()));
 256
 257   // Create the native messaging host.
 258   scoped_ptr<Me2MeNativeMessagingHost> host(
 259       new Me2MeNativeMessagingHost(
 260           needs_elevation,
 261           static_cast<intptr_t>(native_view_handle),
 262           channel.Pass(),
 263           daemon_controller,
 264           pairing_registry,
 265           oauth_client.Pass()));
 266   host->Start(run_loop.QuitClosure());
 267
 268   // Run the loop until channel is alive.
 269   run_loop.Run();
 270   return kSuccessExitCode;
 271 }
 272
 273 int Me2MeNativeMessagingHostMain(int argc, char** argv) {
 274   // This object instance is required by Chrome code (such as MessageLoop).
 275   base::AtExitManager exit_manager;
 276
 277   base::CommandLine::Init(argc, argv);
 278   remoting::InitHostLogging();
 279
 280   return StartMe2MeNativeMessagingHost();
 281 }
 282
 283 }  // namespace remoting