remoting/host/remoting_me2me_host.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 // This file implements a standalone host process for Me2Me.
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/callback.h"
  11 #include "base/command_line.h"
  12 #include "base/debug/alias.h"
  13 #include "base/files/file_path.h"
  14 #include "base/files/file_util.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/message_loop/message_loop.h"
  17 #include "base/single_thread_task_runner.h"
  18 #include "base/strings/string_number_conversions.h"
  19 #include "base/strings/string_util.h"
  20 #include "base/strings/utf_string_conversions.h"
  21 #include "build/build_config.h"
  22 #include "ipc/ipc_channel.h"
  23 #include "ipc/ipc_channel_proxy.h"
  24 #include "ipc/ipc_listener.h"
  25 #include "media/base/media.h"
  26 #include "net/base/net_util.h"
  27 #include "net/base/network_change_notifier.h"
  28 #include "net/socket/client_socket_factory.h"
  29 #include "net/socket/ssl_server_socket.h"
  30 #include "net/url_request/url_fetcher.h"
  31 #include "policy/policy_constants.h"
  32 #include "remoting/base/auto_thread_task_runner.h"
  33 #include "remoting/base/breakpad.h"
  34 #include "remoting/base/constants.h"
  35 #include "remoting/base/logging.h"
  36 #include "remoting/base/rsa_key_pair.h"
  37 #include "remoting/base/service_urls.h"
  38 #include "remoting/base/util.h"
  39 #include "remoting/host/branding.h"
  40 #include "remoting/host/chromoting_host.h"
  41 #include "remoting/host/chromoting_host_context.h"
  42 #include "remoting/host/chromoting_messages.h"
  43 #include "remoting/host/config_file_watcher.h"
  44 #include "remoting/host/config_watcher.h"
  45 #include "remoting/host/desktop_environment.h"
  46 #include "remoting/host/desktop_session_connector.h"
  47 #include "remoting/host/dns_blackhole_checker.h"
  48 #include "remoting/host/gcd_rest_client.h"
  49 #include "remoting/host/gcd_state_updater.h"
  50 #include "remoting/host/heartbeat_sender.h"
  51 #include "remoting/host/host_change_notification_listener.h"
  52 #include "remoting/host/host_config.h"
  53 #include "remoting/host/host_event_logger.h"
  54 #include "remoting/host/host_exit_codes.h"
  55 #include "remoting/host/host_main.h"
  56 #include "remoting/host/host_status_logger.h"
  57 #include "remoting/host/input_injector.h"
  58 #include "remoting/host/ipc_constants.h"
  59 #include "remoting/host/ipc_desktop_environment.h"
  60 #include "remoting/host/ipc_host_event_logger.h"
  61 #include "remoting/host/logging.h"
  62 #include "remoting/host/me2me_desktop_environment.h"
  63 #include "remoting/host/oauth_token_getter_impl.h"
  64 #include "remoting/host/pairing_registry_delegate.h"
  65 #include "remoting/host/policy_watcher.h"
  66 #include "remoting/host/session_manager_factory.h"
  67 #include "remoting/host/shutdown_watchdog.h"
  68 #include "remoting/host/signaling_connector.h"
  69 #include "remoting/host/single_window_desktop_environment.h"
  70 #include "remoting/host/third_party_auth_config.h"
  71 #include "remoting/host/token_validator_factory_impl.h"
  72 #include "remoting/host/usage_stats_consent.h"
  73 #include "remoting/host/username.h"
  74 #include "remoting/host/video_frame_recorder_host_extension.h"
  75 #include "remoting/protocol/me2me_host_authenticator_factory.h"
  76 #include "remoting/protocol/network_settings.h"
  77 #include "remoting/protocol/pairing_registry.h"
  78 #include "remoting/protocol/port_range.h"
  79 #include "remoting/protocol/token_validator.h"
  80 #include "remoting/signaling/push_notification_subscriber.h"
  81 #include "remoting/signaling/xmpp_signal_strategy.h"
  82
  83 #if defined(OS_POSIX)
  84 #include <signal.h>
  85 #include <sys/types.h>
  86 #include <unistd.h>
  87 #include "base/file_descriptor_posix.h"
  88 #include "remoting/host/pam_authorization_factory_posix.h"
  89 #include "remoting/host/posix/signal_handler.h"
  90 #endif  // defined(OS_POSIX)
  91
  92 #if defined(OS_MACOSX)
  93 #include "base/mac/scoped_cftyperef.h"
  94 #endif  // defined(OS_MACOSX)
  95
  96 #if defined(OS_LINUX)
  97 #include <gtk/gtk.h>
  98 #include <X11/Xlib.h>
  99 #include "remoting/host/audio_capturer_linux.h"
 100 #endif  // defined(OS_LINUX)
 101
 102 #if defined(OS_WIN)
 103 #include <commctrl.h>
 104 #include "base/win/registry.h"
 105 #include "base/win/scoped_handle.h"
 106 #include "remoting/host/pairing_registry_delegate_win.h"
 107 #include "remoting/host/win/session_desktop_environment.h"
 108 #endif  // defined(OS_WIN)
 109
 110 using remoting::protocol::PairingRegistry;
 111 using remoting::protocol::NetworkSettings;
 112
 113 #if defined(USE_REMOTING_MACOSX_INTERNAL)
 114 #include "remoting/tools/internal/internal_mac-inl.h"
 115 #endif
 116
 117 namespace {
 118
 119 #if !defined(REMOTING_MULTI_PROCESS)
 120 // This is used for tagging system event logs.
 121 const char kApplicationName[] = "chromoting";
 122
 123 // Value used for --host-config option to indicate that the path must be read
 124 // from stdin.
 125 const char kStdinConfigPath[] = "-";
 126 #endif  // !defined(REMOTING_MULTI_PROCESS)
 127
 128 #if defined(OS_LINUX)
 129 // The command line switch used to pass name of the pipe to capture audio on
 130 // linux.
 131 const char kAudioPipeSwitchName[] = "audio-pipe-name";
 132
 133 // The command line switch used to pass name of the unix domain socket used to
 134 // listen for gnubby requests.
 135 const char kAuthSocknameSwitchName[] = "ssh-auth-sockname";
 136 #endif  // defined(OS_LINUX)
 137
 138 // The command line switch used by the parent to request the host to signal it
 139 // when it is successfully started.
 140 const char kSignalParentSwitchName[] = "signal-parent";
 141
 142 // Command line switch used to enable VP9 encoding.
 143 const char kEnableVp9SwitchName[] = "enable-vp9";
 144
 145 // Command line switch used to enable and configure the frame-recorder.
 146 const char kFrameRecorderBufferKbName[] = "frame-recorder-buffer-kb";
 147
 148 const char kWindowIdSwitchName[] = "window-id";
 149
 150 // Maximum time to wait for clean shutdown to occur, before forcing termination
 151 // of the process.
 152 const int kShutdownTimeoutSeconds = 15;
 153
 154 // Maximum time to wait for reporting host-offline-reason to the service,
 155 // before continuing normal process shutdown.
 156 const int kHostOfflineReasonTimeoutSeconds = 10;
 157
 158 // Host offline reasons not associated with shutting down the host process
 159 // and therefore not expressible through HostExitCodes enum.
 160 const char kHostOfflineReasonPolicyReadError[] = "POLICY_READ_ERROR";
 161 const char kHostOfflineReasonPolicyChangeRequiresRestart[] =
 162     "POLICY_CHANGE_REQUIRES_RESTART";
 163
 164 }  // namespace
 165
 166 namespace remoting {
 167
 168 class HostProcess : public ConfigWatcher::Delegate,
 169                     public HostChangeNotificationListener::Listener,
 170                     public IPC::Listener,
 171                     public base::RefCountedThreadSafe<HostProcess> {
 172  public:
 173   // |shutdown_watchdog| is armed when shutdown is started, and should be kept
 174   // alive as long as possible until the process exits (since destroying the
 175   // watchdog disarms it).
 176   HostProcess(scoped_ptr<ChromotingHostContext> context,
 177               int* exit_code_out,
 178               ShutdownWatchdog* shutdown_watchdog);
 179
 180   // ConfigWatcher::Delegate interface.
 181   void OnConfigUpdated(const std::string& serialized_config) override;
 182   void OnConfigWatcherError() override;
 183
 184   // IPC::Listener implementation.
 185   bool OnMessageReceived(const IPC::Message& message) override;
 186   void OnChannelError() override;
 187
 188   // HostChangeNotificationListener::Listener overrides.
 189   void OnHostDeleted() override;
 190
 191   // Handler of the ChromotingDaemonNetworkMsg_InitializePairingRegistry IPC
 192   // message.
 193   void OnInitializePairingRegistry(
 194       IPC::PlatformFileForTransit privileged_key,
 195       IPC::PlatformFileForTransit unprivileged_key);
 196
 197  private:
 198   // See SetState method for a list of allowed state transitions.
 199   enum HostState {
 200     // Waiting for valid config and policies to be read from the disk.
 201     // Either the host process has just been started, or it is trying to start
 202     // again after temporarily going offline due to policy change or error.
 203     HOST_STARTING,
 204
 205     // Host is started and running.
 206     HOST_STARTED,
 207
 208     // Host is sending offline reason, before trying to restart.
 209     HOST_GOING_OFFLINE_TO_RESTART,
 210
 211     // Host is sending offline reason, before shutting down.
 212     HOST_GOING_OFFLINE_TO_STOP,
 213
 214     // Host has been stopped (host process will end soon).
 215     HOST_STOPPED,
 216   };
 217
 218   enum PolicyState {
 219     // Cannot start the host, because a valid policy has not been read yet.
 220     POLICY_INITIALIZING,
 221
 222     // Policy was loaded successfully.
 223     POLICY_LOADED,
 224
 225     // Policy error was detected, and we haven't yet sent out a
 226     // host-offline-reason (i.e. because we haven't yet read the config).
 227     POLICY_ERROR_REPORT_PENDING,
 228
 229     // Policy error was detected, and we have sent out a host-offline-reason.
 230     POLICY_ERROR_REPORTED,
 231   };
 232
 233   friend class base::RefCountedThreadSafe<HostProcess>;
 234   ~HostProcess() override;
 235
 236   void SetState(HostState target_state);
 237
 238   void StartOnNetworkThread();
 239
 240 #if defined(OS_POSIX)
 241   // Callback passed to RegisterSignalHandler() to handle SIGTERM events.
 242   void SigTermHandler(int signal_number);
 243 #endif
 244
 245   // Called to initialize resources on the UI thread.
 246   void StartOnUiThread();
 247
 248   // Initializes IPC control channel and config file path from |cmd_line|.
 249   // Called on the UI thread.
 250   bool InitWithCommandLine(const base::CommandLine* cmd_line);
 251
 252   // Called on the UI thread to start monitoring the configuration file.
 253   void StartWatchingConfigChanges();
 254
 255   // Called on the network thread to set the host's Authenticator factory.
 256   void CreateAuthenticatorFactory();
 257
 258   // Tear down resources that run on the UI thread.
 259   void ShutdownOnUiThread();
 260
 261   // Applies the host config, returning true if successful.
 262   bool ApplyConfig(const base::DictionaryValue& config);
 263
 264   // Handles policy updates, by calling On*PolicyUpdate methods.
 265   void OnPolicyUpdate(scoped_ptr<base::DictionaryValue> policies);
 266   void OnPolicyError();
 267   void ReportPolicyErrorAndRestartHost();
 268   void ApplyHostDomainPolicy();
 269   void ApplyUsernamePolicy();
 270   bool OnHostDomainPolicyUpdate(base::DictionaryValue* policies);
 271   bool OnUsernamePolicyUpdate(base::DictionaryValue* policies);
 272   bool OnNatPolicyUpdate(base::DictionaryValue* policies);
 273   bool OnRelayPolicyUpdate(base::DictionaryValue* policies);
 274   bool OnUdpPortPolicyUpdate(base::DictionaryValue* policies);
 275   bool OnCurtainPolicyUpdate(base::DictionaryValue* policies);
 276   bool OnHostTalkGadgetPrefixPolicyUpdate(base::DictionaryValue* policies);
 277   bool OnHostTokenUrlPolicyUpdate(base::DictionaryValue* policies);
 278   bool OnPairingPolicyUpdate(base::DictionaryValue* policies);
 279   bool OnGnubbyAuthPolicyUpdate(base::DictionaryValue* policies);
 280
 281   void InitializeSignaling();
 282
 283   void StartHostIfReady();
 284   void StartHost();
 285
 286   // Error handler for HeartbeatSender.
 287   void OnHeartbeatSuccessful();
 288   void OnUnknownHostIdError();
 289
 290   // Error handler for SignalingConnector.
 291   void OnAuthFailed();
 292
 293   void RestartHost(const std::string& host_offline_reason);
 294   void ShutdownHost(HostExitCodes exit_code);
 295
 296   // Helper methods doing the work needed by RestartHost and ShutdownHost.
 297   void GoOffline(const std::string& host_offline_reason);
 298   void OnHostOfflineReasonAck(bool success);
 299
 300 #if defined(OS_WIN)
 301   // Initializes the pairing registry on Windows. This should be invoked on the
 302   // network thread.
 303   void InitializePairingRegistry(
 304       IPC::PlatformFileForTransit privileged_key,
 305       IPC::PlatformFileForTransit unprivileged_key);
 306 #endif  // defined(OS_WIN)
 307
 308   // Crashes the process in response to a daemon's request. The daemon passes
 309   // the location of the code that detected the fatal error resulted in this
 310   // request.
 311   void OnCrash(const std::string& function_name,
 312                const std::string& file_name,
 313                const int& line_number);
 314
 315   scoped_ptr<ChromotingHostContext> context_;
 316
 317   // Accessed on the UI thread.
 318   scoped_ptr<IPC::ChannelProxy> daemon_channel_;
 319
 320   // XMPP server/remoting bot configuration (initialized from the command line).
 321   XmppSignalStrategy::XmppServerConfig xmpp_server_config_;
 322   std::string directory_bot_jid_;
 323
 324   // Created on the UI thread but used from the network thread.
 325   base::FilePath host_config_path_;
 326   std::string host_config_;
 327   scoped_ptr<DesktopEnvironmentFactory> desktop_environment_factory_;
 328
 329   // Accessed on the network thread.
 330   HostState state_;
 331
 332   scoped_ptr<ConfigWatcher> config_watcher_;
 333
 334   std::string host_id_;
 335   protocol::SharedSecretHash host_secret_hash_;
 336   scoped_refptr<RsaKeyPair> key_pair_;
 337   std::string oauth_refresh_token_;
 338   std::string serialized_config_;
 339   std::string host_owner_;
 340   std::string host_owner_email_;
 341   bool use_service_account_;
 342   bool enable_vp9_;
 343   int64_t frame_recorder_buffer_size_;
 344
 345   scoped_ptr<PolicyWatcher> policy_watcher_;
 346   PolicyState policy_state_;
 347   std::string host_domain_;
 348   bool host_username_match_required_;
 349   bool allow_nat_traversal_;
 350   bool allow_relay_;
 351   PortRange udp_port_range_;
 352   std::string talkgadget_prefix_;
 353   bool allow_pairing_;
 354
 355   bool curtain_required_;
 356   ThirdPartyAuthConfig third_party_auth_config_;
 357   bool enable_gnubby_auth_;
 358
 359   // Boolean to change flow, where necessary, if we're
 360   // capturing a window instead of the entire desktop.
 361   bool enable_window_capture_;
 362
 363   // Used to specify which window to stream, if enabled.
 364   webrtc::WindowId window_id_;
 365
 366   // Must outlive |gcd_state_updater_| and |signaling_connector_|.
 367   scoped_ptr<OAuthTokenGetter> oauth_token_getter_;
 368
 369   // Must outlive |signaling_connector_|, |gcd_subscriber_|, and
 370   // |heartbeat_sender_|.
 371   scoped_ptr<SignalStrategy> signal_strategy_;
 372
 373   scoped_ptr<SignalingConnector> signaling_connector_;
 374   scoped_ptr<HeartbeatSender> heartbeat_sender_;
 375 #if defined(USE_GCD)
 376   scoped_ptr<GcdStateUpdater> gcd_state_updater_;
 377   scoped_ptr<PushNotificationSubscriber> gcd_subscriber_;
 378 #endif  // defined(USE_GCD)
 379
 380   scoped_ptr<HostChangeNotificationListener> host_change_notification_listener_;
 381   scoped_ptr<HostStatusLogger> host_status_logger_;
 382   scoped_ptr<HostEventLogger> host_event_logger_;
 383
 384   scoped_ptr<ChromotingHost> host_;
 385
 386   // Used to keep this HostProcess alive until it is shutdown.
 387   scoped_refptr<HostProcess> self_;
 388
 389 #if defined(REMOTING_MULTI_PROCESS)
 390   DesktopSessionConnector* desktop_session_connector_;
 391 #endif  // defined(REMOTING_MULTI_PROCESS)
 392
 393   int* exit_code_out_;
 394   bool signal_parent_;
 395
 396   scoped_refptr<PairingRegistry> pairing_registry_;
 397
 398   ShutdownWatchdog* shutdown_watchdog_;
 399
 400   DISALLOW_COPY_AND_ASSIGN(HostProcess);
 401 };
 402
 403 HostProcess::HostProcess(scoped_ptr<ChromotingHostContext> context,
 404                          int* exit_code_out,
 405                          ShutdownWatchdog* shutdown_watchdog)
 406     : context_(context.Pass()),
 407       state_(HOST_STARTING),
 408       use_service_account_(false),
 409       enable_vp9_(false),
 410       frame_recorder_buffer_size_(0),
 411       policy_state_(POLICY_INITIALIZING),
 412       host_username_match_required_(false),
 413       allow_nat_traversal_(true),
 414       allow_relay_(true),
 415       allow_pairing_(true),
 416       curtain_required_(false),
 417       enable_gnubby_auth_(false),
 418       enable_window_capture_(false),
 419       window_id_(0),
 420       self_(this),
 421 #if defined(REMOTING_MULTI_PROCESS)
 422       desktop_session_connector_(nullptr),
 423 #endif  // defined(REMOTING_MULTI_PROCESS)
 424       exit_code_out_(exit_code_out),
 425       signal_parent_(false),
 426       shutdown_watchdog_(shutdown_watchdog) {
 427   StartOnUiThread();
 428 }
 429
 430 HostProcess::~HostProcess() {
 431   // Verify that UI components have been torn down.
 432   DCHECK(!config_watcher_);
 433   DCHECK(!daemon_channel_);
 434   DCHECK(!desktop_environment_factory_);
 435
 436   // We might be getting deleted on one of the threads the |host_context| owns,
 437   // so we need to post it back to the caller thread to safely join & delete the
 438   // threads it contains.  This will go away when we move to AutoThread.
 439   // |context_release()| will null |context_| before the method is invoked, so
 440   // we need to pull out the task-runner on which to call DeleteSoon first.
 441   scoped_refptr<base::SingleThreadTaskRunner> task_runner =
 442       context_->ui_task_runner();
 443   task_runner->DeleteSoon(FROM_HERE, context_.release());
 444 }
 445
 446 bool HostProcess::InitWithCommandLine(const base::CommandLine* cmd_line) {
 447 #if defined(REMOTING_MULTI_PROCESS)
 448   // Parse the handle value and convert it to a handle/file descriptor.
 449   std::string channel_name =
 450       cmd_line->GetSwitchValueASCII(kDaemonPipeSwitchName);
 451
 452   int pipe_handle = 0;
 453   if (channel_name.empty() ||
 454       !base::StringToInt(channel_name, &pipe_handle)) {
 455     LOG(ERROR) << "Invalid '" << kDaemonPipeSwitchName
 456                << "' value: " << channel_name;
 457     return false;
 458   }
 459
 460 #if defined(OS_WIN)
 461   base::win::ScopedHandle pipe(reinterpret_cast<HANDLE>(pipe_handle));
 462   IPC::ChannelHandle channel_handle(pipe.Get());
 463 #elif defined(OS_POSIX)
 464   base::FileDescriptor pipe(pipe_handle, true);
 465   IPC::ChannelHandle channel_handle(channel_name, pipe);
 466 #endif  // defined(OS_POSIX)
 467
 468   // Connect to the daemon process.
 469   daemon_channel_ = IPC::ChannelProxy::Create(channel_handle,
 470                                               IPC::Channel::MODE_CLIENT,
 471                                               this,
 472                                               context_->network_task_runner());
 473 #else  // !defined(REMOTING_MULTI_PROCESS)
 474   // Connect to the daemon process.
 475   std::string channel_name =
 476       cmd_line->GetSwitchValueASCII(kDaemonPipeSwitchName);
 477   if (!channel_name.empty()) {
 478     daemon_channel_ =
 479         IPC::ChannelProxy::Create(channel_name,
 480                                   IPC::Channel::MODE_CLIENT,
 481                                   this,
 482                                   context_->network_task_runner().get());
 483   }
 484
 485   if (cmd_line->HasSwitch(kHostConfigSwitchName)) {
 486     host_config_path_ = cmd_line->GetSwitchValuePath(kHostConfigSwitchName);
 487
 488     // Read config from stdin if necessary.
 489     if (host_config_path_ == base::FilePath(kStdinConfigPath)) {
 490       const size_t kBufferSize = 4096;
 491       scoped_ptr<char[]> buf(new char[kBufferSize]);
 492       size_t len;
 493       while ((len = fread(buf.get(), 1, kBufferSize, stdin)) > 0) {
 494         host_config_.append(buf.get(), len);
 495       }
 496     }
 497   } else {
 498     base::FilePath default_config_dir = remoting::GetConfigDir();
 499     host_config_path_ = default_config_dir.Append(kDefaultHostConfigFile);
 500   }
 501
 502   if (host_config_path_ != base::FilePath(kStdinConfigPath) &&
 503       !base::PathExists(host_config_path_)) {
 504     LOG(ERROR) << "Can't find host config at " << host_config_path_.value();
 505     return false;
 506   }
 507 #endif  // !defined(REMOTING_MULTI_PROCESS)
 508
 509   // Ignore certificate requests - the host currently has no client certificate
 510   // support, so ignoring certificate requests allows connecting to servers that
 511   // request, but don't require, a certificate (optional client authentication).
 512   net::URLFetcher::SetIgnoreCertificateRequests(true);
 513
 514   ServiceUrls* service_urls = ServiceUrls::GetInstance();
 515
 516   const std::string& xmpp_server =
 517       service_urls->xmpp_server_address_for_me2me_host();
 518   if (!net::ParseHostAndPort(xmpp_server, &xmpp_server_config_.host,
 519                              &xmpp_server_config_.port)) {
 520     LOG(ERROR) << "Invalid XMPP server: " << xmpp_server;
 521     return false;
 522   }
 523   xmpp_server_config_.use_tls = service_urls->xmpp_server_use_tls();
 524   directory_bot_jid_ = service_urls->directory_bot_jid();
 525
 526   signal_parent_ = cmd_line->HasSwitch(kSignalParentSwitchName);
 527
 528   enable_window_capture_ = cmd_line->HasSwitch(kWindowIdSwitchName);
 529   if (enable_window_capture_) {
 530
 531 #if defined(OS_LINUX) || defined(OS_WIN)
 532     LOG(WARNING) << "Window capturing is not fully supported on Linux or "
 533                     "Windows.";
 534 #endif  // defined(OS_LINUX) || defined(OS_WIN)
 535
 536     // uint32_t is large enough to hold window IDs on all platforms.
 537     uint32_t window_id;
 538     if (base::StringToUint(
 539             cmd_line->GetSwitchValueASCII(kWindowIdSwitchName),
 540             &window_id)) {
 541       window_id_ = static_cast<webrtc::WindowId>(window_id);
 542     } else {
 543       LOG(ERROR) << "Window with window id: " << window_id_
 544                  << " not found. Shutting down host.";
 545       return false;
 546     }
 547   }
 548   return true;
 549 }
 550
 551 void HostProcess::OnConfigUpdated(
 552     const std::string& serialized_config) {
 553   if (!context_->network_task_runner()->BelongsToCurrentThread()) {
 554     context_->network_task_runner()->PostTask(FROM_HERE,
 555         base::Bind(&HostProcess::OnConfigUpdated, this, serialized_config));
 556     return;
 557   }
 558
 559   // Filter out duplicates.
 560   if (serialized_config_ == serialized_config)
 561     return;
 562
 563   HOST_LOG << "Processing new host configuration.";
 564
 565   serialized_config_ = serialized_config;
 566   scoped_ptr<base::DictionaryValue> config(
 567       HostConfigFromJson(serialized_config));
 568   if (!config) {
 569     LOG(ERROR) << "Invalid configuration.";
 570     ShutdownHost(kInvalidHostConfigurationExitCode);
 571     return;
 572   }
 573
 574   if (!ApplyConfig(*config)) {
 575     LOG(ERROR) << "Failed to apply the configuration.";
 576     ShutdownHost(kInvalidHostConfigurationExitCode);
 577     return;
 578   }
 579
 580   if (state_ == HOST_STARTING) {
 581     StartHostIfReady();
 582   } else if (state_ == HOST_STARTED) {
 583     // Reapply policies that could be affected by a new config.
 584     DCHECK_EQ(policy_state_, POLICY_LOADED);
 585     ApplyHostDomainPolicy();
 586     ApplyUsernamePolicy();
 587
 588     // TODO(sergeyu): Here we assume that PIN is the only part of the config
 589     // that may change while the service is running. Change ApplyConfig() to
 590     // detect other changes in the config and restart host if necessary here.
 591     CreateAuthenticatorFactory();
 592   }
 593 }
 594
 595 void HostProcess::OnConfigWatcherError() {
 596   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 597   ShutdownHost(kInvalidHostConfigurationExitCode);
 598 }
 599
 600 // Allowed state transitions (enforced via DCHECKs in SetState method):
 601 //   STARTING->STARTED (once we have valid config + policy)
 602 //   STARTING->GOING_OFFLINE_TO_STOP
 603 //   STARTING->GOING_OFFLINE_TO_RESTART
 604 //   STARTED->GOING_OFFLINE_TO_STOP
 605 //   STARTED->GOING_OFFLINE_TO_RESTART
 606 //   GOING_OFFLINE_TO_RESTART->GOING_OFFLINE_TO_STOP
 607 //   GOING_OFFLINE_TO_RESTART->STARTING (after OnHostOfflineReasonAck)
 608 //   GOING_OFFLINE_TO_STOP->STOPPED (after OnHostOfflineReasonAck)
 609 //
 610 // |host_| must be not-null in STARTED state and nullptr in all other states
 611 // (although this invariant can be temporarily violated when doing
 612 // synchronous processing on the networking thread).
 613 void HostProcess::SetState(HostState target_state) {
 614   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 615
 616   // DCHECKs below enforce state allowed transitions listed in HostState.
 617   switch (state_) {
 618     case HOST_STARTING:
 619       DCHECK((target_state == HOST_STARTED) ||
 620              (target_state == HOST_GOING_OFFLINE_TO_STOP) ||
 621              (target_state == HOST_GOING_OFFLINE_TO_RESTART))
 622           << state_ << " -> " << target_state;
 623       break;
 624     case HOST_STARTED:
 625       DCHECK((target_state == HOST_GOING_OFFLINE_TO_STOP) ||
 626              (target_state == HOST_GOING_OFFLINE_TO_RESTART))
 627           << state_ << " -> " << target_state;
 628       break;
 629     case HOST_GOING_OFFLINE_TO_RESTART:
 630       DCHECK((target_state == HOST_GOING_OFFLINE_TO_STOP) ||
 631              (target_state == HOST_STARTING))
 632           << state_ << " -> " << target_state;
 633       break;
 634     case HOST_GOING_OFFLINE_TO_STOP:
 635       DCHECK_EQ(target_state, HOST_STOPPED);
 636       break;
 637     case HOST_STOPPED:  // HOST_STOPPED is a terminal state.
 638     default:
 639       NOTREACHED() << state_ << " -> " << target_state;
 640       break;
 641   }
 642   state_ = target_state;
 643 }
 644
 645 void HostProcess::StartOnNetworkThread() {
 646   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 647
 648   if (state_ != HOST_STARTING) {
 649     // Host was shutdown before the task had a chance to run.
 650     return;
 651   }
 652
 653 #if !defined(REMOTING_MULTI_PROCESS)
 654   if (host_config_path_ == base::FilePath(kStdinConfigPath)) {
 655     // Process config we've read from stdin.
 656     OnConfigUpdated(host_config_);
 657   } else {
 658     // Start watching the host configuration file.
 659     config_watcher_.reset(new ConfigFileWatcher(context_->network_task_runner(),
 660                                                 context_->file_task_runner(),
 661                                                 host_config_path_));
 662     config_watcher_->Watch(this);
 663   }
 664 #endif  // !defined(REMOTING_MULTI_PROCESS)
 665
 666 #if defined(OS_POSIX)
 667   remoting::RegisterSignalHandler(
 668       SIGTERM,
 669       base::Bind(&HostProcess::SigTermHandler, base::Unretained(this)));
 670 #endif  // defined(OS_POSIX)
 671 }
 672
 673 #if defined(OS_POSIX)
 674 void HostProcess::SigTermHandler(int signal_number) {
 675   DCHECK(signal_number == SIGTERM);
 676   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 677   HOST_LOG << "Caught SIGTERM: Shutting down...";
 678   ShutdownHost(kSuccessExitCode);
 679 }
 680 #endif  // OS_POSIX
 681
 682 void HostProcess::CreateAuthenticatorFactory() {
 683   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 684
 685   if (state_ != HOST_STARTED)
 686     return;
 687
 688   std::string local_certificate = key_pair_->GenerateCertificate();
 689   if (local_certificate.empty()) {
 690     LOG(ERROR) << "Failed to generate host certificate.";
 691     ShutdownHost(kInitializationFailed);
 692     return;
 693   }
 694
 695   scoped_ptr<protocol::AuthenticatorFactory> factory;
 696
 697   if (third_party_auth_config_.is_null()) {
 698     scoped_refptr<PairingRegistry> pairing_registry;
 699     if (allow_pairing_) {
 700       // On Windows |pairing_registry_| is initialized in
 701       // InitializePairingRegistry().
 702 #if !defined(OS_WIN)
 703       if (!pairing_registry_) {
 704         scoped_ptr<PairingRegistry::Delegate> delegate =
 705             CreatePairingRegistryDelegate();
 706
 707         if (delegate)
 708           pairing_registry_ = new PairingRegistry(context_->file_task_runner(),
 709                                                   delegate.Pass());
 710       }
 711 #endif  // defined(OS_WIN)
 712
 713       pairing_registry = pairing_registry_;
 714     }
 715
 716     factory = protocol::Me2MeHostAuthenticatorFactory::CreateWithSharedSecret(
 717         use_service_account_, host_owner_, local_certificate, key_pair_,
 718         host_secret_hash_, pairing_registry);
 719
 720     host_->set_pairing_registry(pairing_registry);
 721   } else {
 722     DCHECK(third_party_auth_config_.token_url.is_valid());
 723     DCHECK(third_party_auth_config_.token_validation_url.is_valid());
 724
 725     scoped_ptr<protocol::TokenValidatorFactory> token_validator_factory(
 726         new TokenValidatorFactoryImpl(
 727             third_party_auth_config_,
 728             key_pair_, context_->url_request_context_getter()));
 729     factory = protocol::Me2MeHostAuthenticatorFactory::CreateWithThirdPartyAuth(
 730         use_service_account_, host_owner_, local_certificate, key_pair_,
 731         token_validator_factory.Pass());
 732   }
 733
 734 #if defined(OS_POSIX)
 735   // On Linux and Mac, perform a PAM authorization step after authentication.
 736   factory.reset(new PamAuthorizationFactory(factory.Pass()));
 737 #endif
 738   host_->SetAuthenticatorFactory(factory.Pass());
 739 }
 740
 741 // IPC::Listener implementation.
 742 bool HostProcess::OnMessageReceived(const IPC::Message& message) {
 743   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 744
 745 #if defined(REMOTING_MULTI_PROCESS)
 746   bool handled = true;
 747   IPC_BEGIN_MESSAGE_MAP(HostProcess, message)
 748     IPC_MESSAGE_HANDLER(ChromotingDaemonMsg_Crash, OnCrash)
 749     IPC_MESSAGE_HANDLER(ChromotingDaemonNetworkMsg_Configuration,
 750                         OnConfigUpdated)
 751     IPC_MESSAGE_HANDLER(ChromotingDaemonNetworkMsg_InitializePairingRegistry,
 752                         OnInitializePairingRegistry)
 753     IPC_MESSAGE_FORWARD(
 754         ChromotingDaemonNetworkMsg_DesktopAttached,
 755         desktop_session_connector_,
 756         DesktopSessionConnector::OnDesktopSessionAgentAttached)
 757     IPC_MESSAGE_FORWARD(ChromotingDaemonNetworkMsg_TerminalDisconnected,
 758                         desktop_session_connector_,
 759                         DesktopSessionConnector::OnTerminalDisconnected)
 760     IPC_MESSAGE_UNHANDLED(handled = false)
 761   IPC_END_MESSAGE_MAP()
 762
 763   CHECK(handled) << "Received unexpected IPC type: " << message.type();
 764   return handled;
 765
 766 #else  // !defined(REMOTING_MULTI_PROCESS)
 767   return false;
 768 #endif  // !defined(REMOTING_MULTI_PROCESS)
 769 }
 770
 771 void HostProcess::OnChannelError() {
 772   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 773
 774   // Shutdown the host if the daemon process disconnects the IPC channel.
 775   context_->network_task_runner()->PostTask(
 776       FROM_HERE,
 777       base::Bind(&HostProcess::ShutdownHost, this, kSuccessExitCode));
 778 }
 779
 780 void HostProcess::StartOnUiThread() {
 781   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 782
 783   if (!InitWithCommandLine(base::CommandLine::ForCurrentProcess())) {
 784     // Shutdown the host if the command line is invalid.
 785     context_->network_task_runner()->PostTask(
 786         FROM_HERE, base::Bind(&HostProcess::ShutdownHost, this,
 787                               kUsageExitCode));
 788     return;
 789   }
 790
 791   policy_watcher_ =
 792       PolicyWatcher::Create(nullptr, context_->file_task_runner());
 793   policy_watcher_->StartWatching(
 794       base::Bind(&HostProcess::OnPolicyUpdate, base::Unretained(this)),
 795       base::Bind(&HostProcess::OnPolicyError, base::Unretained(this)));
 796
 797 #if defined(OS_LINUX)
 798   // If an audio pipe is specific on the command-line then initialize
 799   // AudioCapturerLinux to capture from it.
 800   base::FilePath audio_pipe_name = base::CommandLine::ForCurrentProcess()->
 801       GetSwitchValuePath(kAudioPipeSwitchName);
 802   if (!audio_pipe_name.empty()) {
 803     remoting::AudioCapturerLinux::InitializePipeReader(
 804         context_->audio_task_runner(), audio_pipe_name);
 805   }
 806
 807   base::FilePath gnubby_socket_name = base::CommandLine::ForCurrentProcess()->
 808       GetSwitchValuePath(kAuthSocknameSwitchName);
 809   if (!gnubby_socket_name.empty())
 810     remoting::GnubbyAuthHandler::SetGnubbySocketName(gnubby_socket_name);
 811 #endif  // defined(OS_LINUX)
 812
 813   // Create a desktop environment factory appropriate to the build type &
 814   // platform.
 815 #if defined(OS_WIN)
 816   IpcDesktopEnvironmentFactory* desktop_environment_factory =
 817       new IpcDesktopEnvironmentFactory(
 818           context_->audio_task_runner(),
 819           context_->network_task_runner(),
 820           context_->video_capture_task_runner(),
 821           context_->network_task_runner(),
 822           daemon_channel_.get());
 823   desktop_session_connector_ = desktop_environment_factory;
 824 #else  // !defined(OS_WIN)
 825   BasicDesktopEnvironmentFactory* desktop_environment_factory;
 826   if (enable_window_capture_) {
 827     desktop_environment_factory =
 828       new SingleWindowDesktopEnvironmentFactory(
 829           context_->network_task_runner(),
 830           context_->input_task_runner(),
 831           context_->ui_task_runner(),
 832           window_id_);
 833   } else {
 834     desktop_environment_factory =
 835       new Me2MeDesktopEnvironmentFactory(
 836           context_->network_task_runner(),
 837           context_->input_task_runner(),
 838           context_->ui_task_runner());
 839   }
 840 #endif  // !defined(OS_WIN)
 841   desktop_environment_factory->set_supports_touch_events(
 842       InputInjector::SupportsTouchEvents());
 843
 844   desktop_environment_factory_.reset(desktop_environment_factory);
 845   desktop_environment_factory_->SetEnableGnubbyAuth(enable_gnubby_auth_);
 846
 847   context_->network_task_runner()->PostTask(
 848       FROM_HERE,
 849       base::Bind(&HostProcess::StartOnNetworkThread, this));
 850 }
 851
 852 void HostProcess::ShutdownOnUiThread() {
 853   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 854
 855   // Tear down resources that need to be torn down on the UI thread.
 856   daemon_channel_.reset();
 857   desktop_environment_factory_.reset();
 858   policy_watcher_.reset();
 859
 860   // It is now safe for the HostProcess to be deleted.
 861   self_ = nullptr;
 862
 863 #if defined(OS_LINUX)
 864   // Cause the global AudioPipeReader to be freed, otherwise the audio
 865   // thread will remain in-use and prevent the process from exiting.
 866   // TODO(wez): DesktopEnvironmentFactory should own the pipe reader.
 867   // See crbug.com/161373 and crbug.com/104544.
 868   AudioCapturerLinux::InitializePipeReader(nullptr, base::FilePath());
 869 #endif
 870 }
 871
 872 void HostProcess::OnUnknownHostIdError() {
 873   LOG(ERROR) << "Host ID not found.";
 874   ShutdownHost(kInvalidHostIdExitCode);
 875 }
 876
 877 void HostProcess::OnHeartbeatSuccessful() {
 878   HOST_LOG << "Host ready to receive connections.";
 879 #if defined(OS_POSIX)
 880   if (signal_parent_) {
 881     kill(getppid(), SIGUSR1);
 882     signal_parent_ = false;
 883   }
 884 #endif
 885 }
 886
 887 void HostProcess::OnHostDeleted() {
 888   LOG(ERROR) << "Host was deleted from the directory.";
 889   ShutdownHost(kInvalidHostIdExitCode);
 890 }
 891
 892 void HostProcess::OnInitializePairingRegistry(
 893     IPC::PlatformFileForTransit privileged_key,
 894     IPC::PlatformFileForTransit unprivileged_key) {
 895   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 896
 897 #if defined(OS_WIN)
 898   context_->network_task_runner()->PostTask(FROM_HERE, base::Bind(
 899       &HostProcess::InitializePairingRegistry,
 900       this, privileged_key, unprivileged_key));
 901 #else  // !defined(OS_WIN)
 902   NOTREACHED();
 903 #endif  // !defined(OS_WIN)
 904 }
 905
 906 #if defined(OS_WIN)
 907 void HostProcess::InitializePairingRegistry(
 908     IPC::PlatformFileForTransit privileged_key,
 909     IPC::PlatformFileForTransit unprivileged_key) {
 910   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 911   // |privileged_key| can be nullptr but not |unprivileged_key|.
 912   DCHECK(unprivileged_key);
 913   // |pairing_registry_| should only be initialized once.
 914   DCHECK(!pairing_registry_);
 915
 916   HKEY privileged_hkey = reinterpret_cast<HKEY>(
 917       IPC::PlatformFileForTransitToPlatformFile(privileged_key));
 918   HKEY unprivileged_hkey = reinterpret_cast<HKEY>(
 919       IPC::PlatformFileForTransitToPlatformFile(unprivileged_key));
 920
 921   scoped_ptr<PairingRegistryDelegateWin> delegate(
 922       new PairingRegistryDelegateWin());
 923   delegate->SetRootKeys(privileged_hkey, unprivileged_hkey);
 924
 925   pairing_registry_ = new PairingRegistry(context_->file_task_runner(),
 926                                           delegate.Pass());
 927
 928   // (Re)Create the authenticator factory now that |pairing_registry_| has been
 929   // initialized.
 930   CreateAuthenticatorFactory();
 931 }
 932 #endif  // !defined(OS_WIN)
 933
 934 // Applies the host config, returning true if successful.
 935 bool HostProcess::ApplyConfig(const base::DictionaryValue& config) {
 936   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 937
 938   if (!config.GetString(kHostIdConfigPath, &host_id_)) {
 939     LOG(ERROR) << "Config does not define " << kHostIdConfigPath << ".";
 940     return false;
 941   }
 942
 943   std::string key_base64;
 944   if (!config.GetString(kPrivateKeyConfigPath, &key_base64)) {
 945     LOG(ERROR) << "Private key couldn't be read from the config file.";
 946     return false;
 947   }
 948
 949   key_pair_ = RsaKeyPair::FromString(key_base64);
 950   if (!key_pair_.get()) {
 951     LOG(ERROR) << "Invalid private key in the config file.";
 952     return false;
 953   }
 954
 955   std::string host_secret_hash_string;
 956   if (!config.GetString(kHostSecretHashConfigPath,
 957                         &host_secret_hash_string)) {
 958     host_secret_hash_string = "plain:";
 959   }
 960
 961   if (!host_secret_hash_.Parse(host_secret_hash_string)) {
 962     LOG(ERROR) << "Invalid host_secret_hash.";
 963     return false;
 964   }
 965
 966   // Use an XMPP connection to the Talk network for session signaling.
 967   if (!config.GetString(kXmppLoginConfigPath, &xmpp_server_config_.username) ||
 968       !config.GetString(kOAuthRefreshTokenConfigPath, &oauth_refresh_token_)) {
 969     LOG(ERROR) << "XMPP credentials are not defined in the config.";
 970     return false;
 971   }
 972
 973   if (config.GetString(kHostOwnerConfigPath, &host_owner_)) {
 974     // Service account configs have a host_owner, different from the xmpp_login.
 975     use_service_account_ = true;
 976   } else {
 977     // User credential configs only have an xmpp_login, which is also the owner.
 978     host_owner_ = xmpp_server_config_.username;
 979     use_service_account_ = false;
 980   }
 981
 982   // For non-Gmail Google accounts, the owner base JID differs from the email.
 983   // host_owner_ contains the base JID (used for authenticating clients), while
 984   // host_owner_email contains the account's email (used for UI and logs).
 985   if (!config.GetString(kHostOwnerEmailConfigPath, &host_owner_email_)) {
 986     host_owner_email_ = host_owner_;
 987   }
 988
 989   // Allow offering of VP9 encoding to be overridden by the command-line.
 990   if (base::CommandLine::ForCurrentProcess()->HasSwitch(kEnableVp9SwitchName)) {
 991     enable_vp9_ = true;
 992   } else {
 993     config.GetBoolean(kEnableVp9ConfigPath, &enable_vp9_);
 994   }
 995
 996   // Allow the command-line to override the size of the frame recorder buffer.
 997   int frame_recorder_buffer_kb = 0;
 998   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 999           kFrameRecorderBufferKbName)) {
1000     std::string switch_value =
1001         base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
1002             kFrameRecorderBufferKbName);
1003     base::StringToInt(switch_value, &frame_recorder_buffer_kb);
1004   } else {
1005     config.GetInteger(kFrameRecorderBufferKbConfigPath,
1006                       &frame_recorder_buffer_kb);
1007   }
1008   if (frame_recorder_buffer_kb > 0) {
1009     frame_recorder_buffer_size_ = 1024LL * frame_recorder_buffer_kb;
1010   }
1011
1012   return true;
1013 }
1014
1015 void HostProcess::OnPolicyUpdate(scoped_ptr<base::DictionaryValue> policies) {
1016   if (!context_->network_task_runner()->BelongsToCurrentThread()) {
1017     context_->network_task_runner()->PostTask(
1018         FROM_HERE, base::Bind(&HostProcess::OnPolicyUpdate, this,
1019                               base::Passed(&policies)));
1020     return;
1021   }
1022
1023   bool restart_required = false;
1024   restart_required |= OnHostDomainPolicyUpdate(policies.get());
1025   restart_required |= OnCurtainPolicyUpdate(policies.get());
1026   // Note: UsernamePolicyUpdate must run after OnCurtainPolicyUpdate.
1027   restart_required |= OnUsernamePolicyUpdate(policies.get());
1028   restart_required |= OnNatPolicyUpdate(policies.get());
1029   restart_required |= OnRelayPolicyUpdate(policies.get());
1030   restart_required |= OnUdpPortPolicyUpdate(policies.get());
1031   restart_required |= OnHostTalkGadgetPrefixPolicyUpdate(policies.get());
1032   restart_required |= OnHostTokenUrlPolicyUpdate(policies.get());
1033   restart_required |= OnPairingPolicyUpdate(policies.get());
1034   restart_required |= OnGnubbyAuthPolicyUpdate(policies.get());
1035
1036   policy_state_ = POLICY_LOADED;
1037
1038   if (state_ == HOST_STARTING) {
1039     StartHostIfReady();
1040   } else if (state_ == HOST_STARTED) {
1041     if (restart_required)
1042       RestartHost(kHostOfflineReasonPolicyChangeRequiresRestart);
1043   }
1044 }
1045
1046 void HostProcess::OnPolicyError() {
1047   if (!context_->network_task_runner()->BelongsToCurrentThread()) {
1048     context_->network_task_runner()->PostTask(
1049         FROM_HERE, base::Bind(&HostProcess::OnPolicyError, this));
1050     return;
1051   }
1052
1053   if (policy_state_ != POLICY_ERROR_REPORTED) {
1054     policy_state_ = POLICY_ERROR_REPORT_PENDING;
1055     if ((state_ == HOST_STARTED) ||
1056         (state_ == HOST_STARTING && !serialized_config_.empty())) {
1057       ReportPolicyErrorAndRestartHost();
1058     }
1059   }
1060 }
1061
1062 void HostProcess::ReportPolicyErrorAndRestartHost() {
1063   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1064   DCHECK(!serialized_config_.empty());
1065
1066   DCHECK_EQ(policy_state_, POLICY_ERROR_REPORT_PENDING);
1067   policy_state_ = POLICY_ERROR_REPORTED;
1068
1069   LOG(INFO) << "Restarting the host due to policy errors.";
1070   RestartHost(kHostOfflineReasonPolicyReadError);
1071 }
1072
1073 void HostProcess::ApplyHostDomainPolicy() {
1074   if (state_ != HOST_STARTED)
1075     return;
1076
1077   HOST_LOG << "Policy sets host domain: " << host_domain_;
1078
1079   if (!host_domain_.empty()) {
1080     // If the user does not have a Google email, their client JID will not be
1081     // based on their email. In that case, the username/host domain policies
1082     // would be meaningless, since there is no way to check that the JID
1083     // trying to connect actually corresponds to the owner email in question.
1084     if (host_owner_ != host_owner_email_) {
1085       LOG(ERROR) << "The username and host domain policies cannot be enabled "
1086                  << "for accounts with a non-Google email.";
1087       ShutdownHost(kInvalidHostDomainExitCode);
1088     }
1089
1090     if (!base::EndsWith(host_owner_, std::string("@") + host_domain_,
1091                         base::CompareCase::INSENSITIVE_ASCII)) {
1092       LOG(ERROR) << "The host domain does not match the policy.";
1093       ShutdownHost(kInvalidHostDomainExitCode);
1094     }
1095   }
1096 }
1097
1098 bool HostProcess::OnHostDomainPolicyUpdate(base::DictionaryValue* policies) {
1099   // Returns true if the host has to be restarted after this policy update.
1100   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1101
1102   if (!policies->GetString(policy::key::kRemoteAccessHostDomain,
1103                            &host_domain_)) {
1104     return false;
1105   }
1106
1107   ApplyHostDomainPolicy();
1108   return false;
1109 }
1110
1111 void HostProcess::ApplyUsernamePolicy() {
1112   if (state_ != HOST_STARTED)
1113     return;
1114
1115   if (host_username_match_required_) {
1116     HOST_LOG << "Policy requires host username match.";
1117
1118     // See comment in ApplyHostDomainPolicy.
1119     if (host_owner_ != host_owner_email_) {
1120       LOG(ERROR) << "The username and host domain policies cannot be enabled "
1121                  << "for accounts with a non-Google email.";
1122       ShutdownHost(kUsernameMismatchExitCode);
1123     }
1124
1125     std::string username = GetUsername();
1126     bool shutdown =
1127         username.empty() ||
1128         !base::StartsWith(host_owner_, username + std::string("@"),
1129                           base::CompareCase::INSENSITIVE_ASCII);
1130
1131 #if defined(OS_MACOSX)
1132     // On Mac, we run as root at the login screen, so the username won't match.
1133     // However, there's no need to enforce the policy at the login screen, as
1134     // the client will have to reconnect if a login occurs.
1135     if (shutdown && getuid() == 0) {
1136       shutdown = false;
1137     }
1138 #endif
1139
1140     // Curtain-mode on Windows presents the standard OS login prompt to the user
1141     // for each connection, removing the need for an explicit user-name matching
1142     // check.
1143 #if defined(OS_WIN) && defined(REMOTING_RDP_SESSION)
1144     if (curtain_required_)
1145       return;
1146 #endif  // defined(OS_WIN) && defined(REMOTING_RDP_SESSION)
1147
1148     // Shutdown the host if the username does not match.
1149     if (shutdown) {
1150       LOG(ERROR) << "The host username does not match.";
1151       ShutdownHost(kUsernameMismatchExitCode);
1152     }
1153   } else {
1154     HOST_LOG << "Policy does not require host username match.";
1155   }
1156 }
1157
1158 bool HostProcess::OnUsernamePolicyUpdate(base::DictionaryValue* policies) {
1159   // Returns false: never restart the host after this policy update.
1160   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1161
1162   if (!policies->GetBoolean(policy::key::kRemoteAccessHostMatchUsername,
1163                             &host_username_match_required_)) {
1164     return false;
1165   }
1166
1167   ApplyUsernamePolicy();
1168   return false;
1169 }
1170
1171 bool HostProcess::OnNatPolicyUpdate(base::DictionaryValue* policies) {
1172   // Returns true if the host has to be restarted after this policy update.
1173   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1174
1175   if (!policies->GetBoolean(policy::key::kRemoteAccessHostFirewallTraversal,
1176                             &allow_nat_traversal_)) {
1177     return false;
1178   }
1179
1180   if (allow_nat_traversal_) {
1181     HOST_LOG << "Policy enables NAT traversal.";
1182   } else {
1183     HOST_LOG << "Policy disables NAT traversal.";
1184   }
1185   return true;
1186 }
1187
1188 bool HostProcess::OnRelayPolicyUpdate(base::DictionaryValue* policies) {
1189   // Returns true if the host has to be restarted after this policy update.
1190   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1191
1192   if (!policies->GetBoolean(
1193           policy::key::kRemoteAccessHostAllowRelayedConnection,
1194           &allow_relay_)) {
1195     return false;
1196   }
1197
1198   if (allow_relay_) {
1199     HOST_LOG << "Policy enables use of relay server.";
1200   } else {
1201     HOST_LOG << "Policy disables use of relay server.";
1202   }
1203   return true;
1204 }
1205
1206 bool HostProcess::OnUdpPortPolicyUpdate(base::DictionaryValue* policies) {
1207   // Returns true if the host has to be restarted after this policy update.
1208   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1209
1210   std::string string_value;
1211   if (!policies->GetString(policy::key::kRemoteAccessHostUdpPortRange,
1212                            &string_value)) {
1213     return false;
1214   }
1215
1216   if (!PortRange::Parse(string_value, &udp_port_range_)) {
1217     // PolicyWatcher verifies that the value is formatted correctly.
1218     LOG(FATAL) << "Invalid port range: " << string_value;
1219   }
1220   HOST_LOG << "Policy restricts UDP port range to: " << udp_port_range_;
1221   return true;
1222 }
1223
1224 bool HostProcess::OnCurtainPolicyUpdate(base::DictionaryValue* policies) {
1225   // Returns true if the host has to be restarted after this policy update.
1226   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1227
1228   if (!policies->GetBoolean(policy::key::kRemoteAccessHostRequireCurtain,
1229                             &curtain_required_)) {
1230     return false;
1231   }
1232
1233 #if defined(OS_MACOSX)
1234   if (curtain_required_) {
1235     // When curtain mode is in effect on Mac, the host process runs in the
1236     // user's switched-out session, but launchd will also run an instance at
1237     // the console login screen.  Even if no user is currently logged-on, we
1238     // can't support remote-access to the login screen because the current host
1239     // process model disconnects the client during login, which would leave
1240     // the logged in session un-curtained on the console until they reconnect.
1241     //
1242     // TODO(jamiewalch): Fix this once we have implemented the multi-process
1243     // daemon architecture (crbug.com/134894)
1244     if (getuid() == 0) {
1245       LOG(ERROR) << "Running the host in the console login session is yet not "
1246                     "supported.";
1247       ShutdownHost(kLoginScreenNotSupportedExitCode);
1248       return false;
1249     }
1250   }
1251 #endif
1252
1253   if (curtain_required_) {
1254     HOST_LOG << "Policy requires curtain-mode.";
1255   } else {
1256     HOST_LOG << "Policy does not require curtain-mode.";
1257   }
1258
1259   if (host_)
1260     host_->SetEnableCurtaining(curtain_required_);
1261   return false;
1262 }
1263
1264 bool HostProcess::OnHostTalkGadgetPrefixPolicyUpdate(
1265     base::DictionaryValue* policies) {
1266   // Returns true if the host has to be restarted after this policy update.
1267   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1268
1269   if (!policies->GetString(policy::key::kRemoteAccessHostTalkGadgetPrefix,
1270                            &talkgadget_prefix_)) {
1271     return false;
1272   }
1273
1274   HOST_LOG << "Policy sets talkgadget prefix: " << talkgadget_prefix_;
1275   return true;
1276 }
1277
1278 bool HostProcess::OnHostTokenUrlPolicyUpdate(base::DictionaryValue* policies) {
1279   switch (ThirdPartyAuthConfig::Parse(*policies, &third_party_auth_config_)) {
1280     case ThirdPartyAuthConfig::NoPolicy:
1281       return false;
1282     case ThirdPartyAuthConfig::ParsingSuccess:
1283       HOST_LOG << "Policy sets third-party token URLs: "
1284                << third_party_auth_config_;
1285       return true;
1286     case ThirdPartyAuthConfig::InvalidPolicy:
1287     default:
1288       NOTREACHED();
1289       return false;
1290   }
1291 }
1292
1293 bool HostProcess::OnPairingPolicyUpdate(base::DictionaryValue* policies) {
1294   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1295
1296   if (!policies->GetBoolean(policy::key::kRemoteAccessHostAllowClientPairing,
1297                             &allow_pairing_)) {
1298     return false;
1299   }
1300
1301   if (allow_pairing_) {
1302     HOST_LOG << "Policy enables client pairing.";
1303   } else {
1304     HOST_LOG << "Policy disables client pairing.";
1305   }
1306   return true;
1307 }
1308
1309 bool HostProcess::OnGnubbyAuthPolicyUpdate(base::DictionaryValue* policies) {
1310   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1311
1312   if (!policies->GetBoolean(policy::key::kRemoteAccessHostAllowGnubbyAuth,
1313                             &enable_gnubby_auth_)) {
1314     return false;
1315   }
1316
1317   if (enable_gnubby_auth_) {
1318     HOST_LOG << "Policy enables gnubby auth.";
1319   } else {
1320     HOST_LOG << "Policy disables gnubby auth.";
1321   }
1322
1323   if (desktop_environment_factory_)
1324     desktop_environment_factory_->SetEnableGnubbyAuth(enable_gnubby_auth_);
1325
1326   return true;
1327 }
1328
1329 void HostProcess::InitializeSignaling() {
1330   DCHECK(!host_id_.empty());  // ApplyConfig() should already have been run.
1331
1332   DCHECK(!signal_strategy_);
1333   DCHECK(!oauth_token_getter_);
1334   DCHECK(!signaling_connector_);
1335 #if defined(USE_GCD)
1336   DCHECK(!gcd_state_updater_);
1337   DCHECK(!gcd_subscriber_);
1338 #endif  // defined(USE_GCD)
1339   DCHECK(!heartbeat_sender_);
1340
1341   // Create SignalStrategy.
1342   XmppSignalStrategy* xmpp_signal_strategy = new XmppSignalStrategy(
1343       net::ClientSocketFactory::GetDefaultFactory(),
1344       context_->url_request_context_getter(), xmpp_server_config_);
1345   signal_strategy_.reset(xmpp_signal_strategy);
1346
1347   // Create SignalingConnector.
1348   scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker(new DnsBlackholeChecker(
1349       context_->url_request_context_getter(), talkgadget_prefix_));
1350   scoped_ptr<OAuthTokenGetter::OAuthCredentials> oauth_credentials(
1351       new OAuthTokenGetter::OAuthCredentials(xmpp_server_config_.username,
1352                                              oauth_refresh_token_,
1353                                              use_service_account_));
1354   oauth_token_getter_.reset(new OAuthTokenGetterImpl(
1355       oauth_credentials.Pass(), context_->url_request_context_getter(), false));
1356   signaling_connector_.reset(new SignalingConnector(
1357       xmpp_signal_strategy, dns_blackhole_checker.Pass(),
1358       oauth_token_getter_.get(),
1359       base::Bind(&HostProcess::OnAuthFailed, base::Unretained(this))));
1360
1361 #if defined(USE_GCD)
1362   // Create objects to manage GCD state.
1363   ServiceUrls* service_urls = ServiceUrls::GetInstance();
1364   scoped_ptr<GcdRestClient> gcd_rest_client(new GcdRestClient(
1365       service_urls->gcd_base_url(), host_id_,
1366       context_->url_request_context_getter(), oauth_token_getter_.get()));
1367   gcd_state_updater_.reset(
1368       new GcdStateUpdater(base::Bind(&HostProcess::OnHeartbeatSuccessful,
1369                                      base::Unretained(this)),
1370                           base::Bind(&HostProcess::OnUnknownHostIdError,
1371                                      base::Unretained(this)),
1372                           signal_strategy_.get(), gcd_rest_client.Pass()));
1373   PushNotificationSubscriber::Subscription sub;
1374   sub.channel = "cloud_devices";
1375   PushNotificationSubscriber::SubscriptionList subs;
1376   subs.push_back(sub);
1377   gcd_subscriber_.reset(
1378       new PushNotificationSubscriber(signal_strategy_.get(), subs));
1379 #endif  // defined(USE_GCD)
1380
1381   // Create HeartbeatSender.
1382   heartbeat_sender_.reset(new HeartbeatSender(
1383       base::Bind(&HostProcess::OnHeartbeatSuccessful, base::Unretained(this)),
1384       base::Bind(&HostProcess::OnUnknownHostIdError, base::Unretained(this)),
1385       host_id_, signal_strategy_.get(), key_pair_, directory_bot_jid_));
1386 }
1387
1388 void HostProcess::StartHostIfReady() {
1389   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1390   DCHECK_EQ(state_, HOST_STARTING);
1391
1392   // Start the host if both the config and the policies are loaded.
1393   if (!serialized_config_.empty()) {
1394     if (policy_state_ == POLICY_LOADED) {
1395       StartHost();
1396     } else if (policy_state_ == POLICY_ERROR_REPORT_PENDING) {
1397       ReportPolicyErrorAndRestartHost();
1398     }
1399   }
1400 }
1401
1402 void HostProcess::StartHost() {
1403   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1404   DCHECK(!host_);
1405
1406   SetState(HOST_STARTED);
1407
1408   InitializeSignaling();
1409
1410   uint32 network_flags = 0;
1411   if (allow_nat_traversal_) {
1412     network_flags = NetworkSettings::NAT_TRAVERSAL_STUN |
1413                     NetworkSettings::NAT_TRAVERSAL_OUTGOING;
1414     if (allow_relay_)
1415       network_flags |= NetworkSettings::NAT_TRAVERSAL_RELAY;
1416   }
1417
1418   NetworkSettings network_settings(network_flags);
1419
1420   if (!udp_port_range_.is_null()) {
1421     network_settings.port_range = udp_port_range_;
1422   } else if (!allow_nat_traversal_) {
1423     // For legacy reasons we have to restrict the port range to a set of default
1424     // values when nat traversal is disabled, even if the port range was not
1425     // set in policy.
1426     network_settings.port_range.min_port = NetworkSettings::kDefaultMinPort;
1427     network_settings.port_range.max_port = NetworkSettings::kDefaultMaxPort;
1428   }
1429
1430   scoped_ptr<protocol::SessionManager> session_manager =
1431       CreateHostSessionManager(signal_strategy_.get(), network_settings,
1432                                context_->url_request_context_getter());
1433
1434   scoped_ptr<protocol::CandidateSessionConfig> protocol_config =
1435       protocol::CandidateSessionConfig::CreateDefault();
1436   if (!desktop_environment_factory_->SupportsAudioCapture())
1437     protocol_config->DisableAudioChannel();
1438   if (enable_vp9_)
1439     protocol_config->EnableVideoCodec(protocol::ChannelConfig::CODEC_VP9);
1440   session_manager->set_protocol_config(protocol_config.Pass());
1441
1442   host_.reset(new ChromotingHost(
1443       signal_strategy_.get(), desktop_environment_factory_.get(),
1444       session_manager.Pass(), context_->audio_task_runner(),
1445       context_->input_task_runner(), context_->video_capture_task_runner(),
1446       context_->video_encode_task_runner(), context_->network_task_runner(),
1447       context_->ui_task_runner()));
1448
1449   if (frame_recorder_buffer_size_ > 0) {
1450     scoped_ptr<VideoFrameRecorderHostExtension> frame_recorder_extension(
1451         new VideoFrameRecorderHostExtension());
1452     frame_recorder_extension->SetMaxContentBytes(frame_recorder_buffer_size_);
1453     host_->AddExtension(frame_recorder_extension.Pass());
1454   }
1455
1456   // TODO(simonmorris): Get the maximum session duration from a policy.
1457 #if defined(OS_LINUX)
1458   host_->SetMaximumSessionDuration(base::TimeDelta::FromHours(20));
1459 #endif
1460
1461   host_change_notification_listener_.reset(new HostChangeNotificationListener(
1462       this, host_id_, signal_strategy_.get(), directory_bot_jid_));
1463
1464   host_status_logger_.reset(new HostStatusLogger(
1465       host_->AsWeakPtr(), ServerLogEntry::ME2ME,
1466       signal_strategy_.get(), directory_bot_jid_));
1467
1468   // Set up reporting the host status notifications.
1469 #if defined(REMOTING_MULTI_PROCESS)
1470   host_event_logger_.reset(
1471       new IpcHostEventLogger(host_->AsWeakPtr(), daemon_channel_.get()));
1472 #else  // !defined(REMOTING_MULTI_PROCESS)
1473   host_event_logger_ =
1474       HostEventLogger::Create(host_->AsWeakPtr(), kApplicationName);
1475 #endif  // !defined(REMOTING_MULTI_PROCESS)
1476
1477   host_->SetEnableCurtaining(curtain_required_);
1478   host_->Start(host_owner_email_);
1479
1480   CreateAuthenticatorFactory();
1481
1482   ApplyHostDomainPolicy();
1483   ApplyUsernamePolicy();
1484 }
1485
1486 void HostProcess::OnAuthFailed() {
1487   ShutdownHost(kInvalidOauthCredentialsExitCode);
1488 }
1489
1490 void HostProcess::RestartHost(const std::string& host_offline_reason) {
1491   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1492   DCHECK(!host_offline_reason.empty());
1493
1494   SetState(HOST_GOING_OFFLINE_TO_RESTART);
1495   GoOffline(host_offline_reason);
1496 }
1497
1498 void HostProcess::ShutdownHost(HostExitCodes exit_code) {
1499   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1500
1501   *exit_code_out_ = exit_code;
1502
1503   switch (state_) {
1504     case HOST_STARTING:
1505     case HOST_STARTED:
1506       SetState(HOST_GOING_OFFLINE_TO_STOP);
1507       GoOffline(ExitCodeToString(exit_code));
1508       break;
1509
1510     case HOST_GOING_OFFLINE_TO_RESTART:
1511       SetState(HOST_GOING_OFFLINE_TO_STOP);
1512       break;
1513
1514     case HOST_GOING_OFFLINE_TO_STOP:
1515     case HOST_STOPPED:
1516       // Host is already stopped or being stopped. No action is required.
1517       break;
1518   }
1519 }
1520
1521 void HostProcess::GoOffline(const std::string& host_offline_reason) {
1522   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1523   DCHECK(!host_offline_reason.empty());
1524   DCHECK((state_ == HOST_GOING_OFFLINE_TO_STOP) ||
1525          (state_ == HOST_GOING_OFFLINE_TO_RESTART));
1526
1527   // Shut down everything except the HostSignalingManager.
1528   host_.reset();
1529   host_event_logger_.reset();
1530   host_status_logger_.reset();
1531   host_change_notification_listener_.reset();
1532
1533   // Before shutting down HostSignalingManager, send the |host_offline_reason|
1534   // if possible (i.e. if we have the config).
1535   if (!serialized_config_.empty()) {
1536     if (!signal_strategy_)
1537       InitializeSignaling();
1538
1539     HOST_LOG << "SendHostOfflineReason: sending " << host_offline_reason << ".";
1540     if (heartbeat_sender_) {
1541       heartbeat_sender_->SetHostOfflineReason(
1542           host_offline_reason,
1543           base::TimeDelta::FromSeconds(kHostOfflineReasonTimeoutSeconds),
1544           base::Bind(&HostProcess::OnHostOfflineReasonAck, this));
1545     }
1546 #if defined(USE_GCD)
1547     if (gcd_state_updater_) {
1548       gcd_state_updater_->SetHostOfflineReason(
1549           host_offline_reason,
1550           base::TimeDelta::FromSeconds(kHostOfflineReasonTimeoutSeconds),
1551           base::Bind(&HostProcess::OnHostOfflineReasonAck, this));
1552     }
1553 #endif  // defined(USE_GCD)
1554     return;  // Shutdown will resume after OnHostOfflineReasonAck.
1555   }
1556
1557   // Continue the shutdown without sending the host offline reason.
1558   HOST_LOG << "Can't send offline reason (" << host_offline_reason << ") "
1559            << "without a valid host config.";
1560   OnHostOfflineReasonAck(false);
1561 }
1562
1563 void HostProcess::OnHostOfflineReasonAck(bool success) {
1564   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1565   DCHECK(!host_);  // Assert that the host is really offline at this point.
1566
1567   HOST_LOG << "SendHostOfflineReason " << (success ? "succeeded." : "failed.");
1568   heartbeat_sender_.reset();
1569   oauth_token_getter_.reset();
1570   signaling_connector_.reset();
1571   signal_strategy_.reset();
1572 #if defined(USE_GCD)
1573   gcd_state_updater_.reset();
1574   gcd_subscriber_.reset();
1575 #endif  // defined(USE_GCD)
1576
1577   if (state_ == HOST_GOING_OFFLINE_TO_RESTART) {
1578     SetState(HOST_STARTING);
1579     StartHostIfReady();
1580   } else if (state_ == HOST_GOING_OFFLINE_TO_STOP) {
1581     SetState(HOST_STOPPED);
1582
1583     shutdown_watchdog_->SetExitCode(*exit_code_out_);
1584     shutdown_watchdog_->Arm();
1585
1586     config_watcher_.reset();
1587
1588     // Complete the rest of shutdown on the main thread.
1589     context_->ui_task_runner()->PostTask(
1590         FROM_HERE, base::Bind(&HostProcess::ShutdownOnUiThread, this));
1591   } else {
1592     NOTREACHED();
1593   }
1594 }
1595
1596 void HostProcess::OnCrash(const std::string& function_name,
1597                           const std::string& file_name,
1598                           const int& line_number) {
1599   char message[1024];
1600   base::snprintf(message, sizeof(message),
1601                  "Requested by %s at %s, line %d.",
1602                  function_name.c_str(), file_name.c_str(), line_number);
1603   base::debug::Alias(message);
1604
1605   // The daemon requested us to crash the process.
1606   CHECK(false) << message;
1607 }
1608
1609 int HostProcessMain() {
1610 #if defined(OS_LINUX)
1611   // Required in order for us to run multiple X11 threads.
1612   XInitThreads();
1613
1614   // Required for any calls into GTK functions, such as the Disconnect and
1615   // Continue windows, though these should not be used for the Me2Me case
1616   // (crbug.com/104377).
1617   gtk_init(nullptr, nullptr);
1618 #endif
1619
1620   // Enable support for SSL server sockets, which must be done while still
1621   // single-threaded.
1622   net::EnableSSLServerSockets();
1623
1624   // Ensures that media library and specific CPU features are initialized.
1625   media::InitializeMediaLibrary();
1626
1627   // Create the main message loop and start helper threads.
1628   base::MessageLoopForUI message_loop;
1629   scoped_ptr<ChromotingHostContext> context =
1630       ChromotingHostContext::Create(new AutoThreadTaskRunner(
1631           message_loop.task_runner(), base::MessageLoop::QuitClosure()));
1632   if (!context)
1633     return kInitializationFailed;
1634
1635   // NetworkChangeNotifier must be initialized after MessageLoop.
1636   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier(
1637       net::NetworkChangeNotifier::Create());
1638
1639   // Create & start the HostProcess using these threads.
1640   // TODO(wez): The HostProcess holds a reference to itself until Shutdown().
1641   // Remove this hack as part of the multi-process refactoring.
1642   int exit_code = kSuccessExitCode;
1643   ShutdownWatchdog shutdown_watchdog(
1644       base::TimeDelta::FromSeconds(kShutdownTimeoutSeconds));
1645   new HostProcess(context.Pass(), &exit_code, &shutdown_watchdog);
1646
1647   // Run the main (also UI) message loop until the host no longer needs it.
1648   message_loop.Run();
1649
1650   return exit_code;
1651 }
1652
1653 }  // namespace remoting