src/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/at_exit.h"
  10 #include "base/bind.h"
  11 #include "base/callback.h"
  12 #include "base/command_line.h"
  13 #include "base/debug/alias.h"
  14 #include "base/file_util.h"
  15 #include "base/files/file_path.h"
  16 #include "base/memory/scoped_ptr.h"
  17 #include "base/message_loop/message_loop.h"
  18 #include "base/single_thread_task_runner.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "base/strings/string_util.h"
  21 #include "base/strings/utf_string_conversions.h"
  22 #include "base/synchronization/waitable_event.h"
  23 #include "base/threading/thread.h"
  24 #include "build/build_config.h"
  25 #include "crypto/nss_util.h"
  26 #include "ipc/ipc_channel.h"
  27 #include "ipc/ipc_channel_proxy.h"
  28 #include "ipc/ipc_listener.h"
  29 #include "media/base/media.h"
  30 #include "net/base/network_change_notifier.h"
  31 #include "net/socket/client_socket_factory.h"
  32 #include "net/socket/ssl_server_socket.h"
  33 #include "net/url_request/url_fetcher.h"
  34 #include "remoting/base/auto_thread_task_runner.h"
  35 #include "remoting/base/breakpad.h"
  36 #include "remoting/base/constants.h"
  37 #include "remoting/base/logging.h"
  38 #include "remoting/base/rsa_key_pair.h"
  39 #include "remoting/base/service_urls.h"
  40 #include "remoting/base/util.h"
  41 #include "remoting/host/branding.h"
  42 #include "remoting/host/chromoting_host.h"
  43 #include "remoting/host/chromoting_host_context.h"
  44 #include "remoting/host/chromoting_messages.h"
  45 #include "remoting/host/config_file_watcher.h"
  46 #include "remoting/host/config_watcher.h"
  47 #include "remoting/host/desktop_environment.h"
  48 #include "remoting/host/desktop_session_connector.h"
  49 #include "remoting/host/dns_blackhole_checker.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/host_status_sender.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/json_host_config.h"
  62 #include "remoting/host/logging.h"
  63 #include "remoting/host/me2me_desktop_environment.h"
  64 #include "remoting/host/pairing_registry_delegate.h"
  65 #include "remoting/host/policy_hack/policy_watcher.h"
  66 #include "remoting/host/session_manager_factory.h"
  67 #include "remoting/host/signaling_connector.h"
  68 #include "remoting/host/single_window_desktop_environment.h"
  69 #include "remoting/host/token_validator_factory_impl.h"
  70 #include "remoting/host/usage_stats_consent.h"
  71 #include "remoting/host/username.h"
  72 #include "remoting/host/video_frame_recorder_host_extension.h"
  73 #include "remoting/protocol/me2me_host_authenticator_factory.h"
  74 #include "remoting/protocol/network_settings.h"
  75 #include "remoting/protocol/pairing_registry.h"
  76 #include "remoting/protocol/token_validator.h"
  77 #include "remoting/signaling/xmpp_signal_strategy.h"
  78
  79 #if defined(OS_POSIX)
  80 #include <signal.h>
  81 #include <sys/types.h>
  82 #include <unistd.h>
  83 #include "base/file_descriptor_posix.h"
  84 #include "remoting/host/pam_authorization_factory_posix.h"
  85 #include "remoting/host/posix/signal_handler.h"
  86 #endif  // defined(OS_POSIX)
  87
  88 #if defined(OS_MACOSX)
  89 #include "base/mac/scoped_cftyperef.h"
  90 #endif  // defined(OS_MACOSX)
  91
  92 #if defined(OS_LINUX)
  93 #include <gtk/gtk.h>
  94 #include "remoting/host/audio_capturer_linux.h"
  95 #endif  // defined(OS_LINUX)
  96
  97 #if defined(OS_WIN)
  98 #include <commctrl.h>
  99 #include "base/win/registry.h"
 100 #include "base/win/scoped_handle.h"
 101 #include "remoting/host/pairing_registry_delegate_win.h"
 102 #include "remoting/host/win/session_desktop_environment.h"
 103 #endif  // defined(OS_WIN)
 104
 105 using remoting::protocol::PairingRegistry;
 106 using remoting::protocol::NetworkSettings;
 107
 108 namespace {
 109
 110 // This is used for tagging system event logs.
 111 const char kApplicationName[] = "chromoting";
 112
 113 #if defined(OS_LINUX)
 114 // The command line switch used to pass name of the pipe to capture audio on
 115 // linux.
 116 const char kAudioPipeSwitchName[] = "audio-pipe-name";
 117
 118 // The command line switch used to pass name of the unix domain socket used to
 119 // listen for gnubby requests.
 120 const char kAuthSocknameSwitchName[] = "ssh-auth-sockname";
 121 #endif  // defined(OS_LINUX)
 122
 123 // The command line switch used by the parent to request the host to signal it
 124 // when it is successfully started.
 125 const char kSignalParentSwitchName[] = "signal-parent";
 126
 127 // Command line switch used to enable VP9 encoding.
 128 const char kEnableVp9SwitchName[] = "enable-vp9";
 129
 130 // Command line switch used to enable and configure the frame-recorder.
 131 const char kFrameRecorderBufferKbName[] = "frame-recorder-buffer-kb";
 132
 133 // Value used for --host-config option to indicate that the path must be read
 134 // from stdin.
 135 const char kStdinConfigPath[] = "-";
 136
 137 const char kWindowIdSwitchName[] = "window-id";
 138
 139 }  // namespace
 140
 141 namespace remoting {
 142
 143 class HostProcess
 144     : public ConfigWatcher::Delegate,
 145       public HeartbeatSender::Listener,
 146       public HostChangeNotificationListener::Listener,
 147       public IPC::Listener,
 148       public base::RefCountedThreadSafe<HostProcess> {
 149  public:
 150   HostProcess(scoped_ptr<ChromotingHostContext> context,
 151               int* exit_code_out);
 152
 153   // ConfigWatcher::Delegate interface.
 154   virtual void OnConfigUpdated(const std::string& serialized_config) OVERRIDE;
 155   virtual void OnConfigWatcherError() OVERRIDE;
 156
 157   // IPC::Listener implementation.
 158   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 159   virtual void OnChannelError() OVERRIDE;
 160
 161   // HeartbeatSender::Listener overrides.
 162   virtual void OnHeartbeatSuccessful() OVERRIDE;
 163   virtual void OnUnknownHostIdError() OVERRIDE;
 164
 165   // HostChangeNotificationListener::Listener overrides.
 166   virtual void OnHostDeleted() OVERRIDE;
 167
 168   // Initializes the pairing registry on Windows.
 169   void OnInitializePairingRegistry(
 170       IPC::PlatformFileForTransit privileged_key,
 171       IPC::PlatformFileForTransit unprivileged_key);
 172
 173  private:
 174   enum HostState {
 175     // Host process has just been started. Waiting for config and policies to be
 176     // read from the disk.
 177     HOST_INITIALIZING,
 178
 179     // Host is started and running.
 180     HOST_STARTED,
 181
 182     // Host is being stopped and will need to be started again.
 183     HOST_STOPPING_TO_RESTART,
 184
 185     // Host is being stopped.
 186     HOST_STOPPING,
 187
 188     // Host has been stopped.
 189     HOST_STOPPED,
 190
 191     // Allowed state transitions:
 192     //   INITIALIZING->STARTED
 193     //   INITIALIZING->STOPPED
 194     //   STARTED->STOPPING_TO_RESTART
 195     //   STARTED->STOPPING
 196     //   STOPPING_TO_RESTART->STARTED
 197     //   STOPPING_TO_RESTART->STOPPING
 198     //   STOPPING->STOPPED
 199     //   STOPPED->STARTED
 200     //
 201     // |host_| must be NULL in INITIALIZING and STOPPED states and not-NULL in
 202     // all other states.
 203   };
 204
 205   friend class base::RefCountedThreadSafe<HostProcess>;
 206   virtual ~HostProcess();
 207
 208   void StartOnNetworkThread();
 209
 210 #if defined(OS_POSIX)
 211   // Callback passed to RegisterSignalHandler() to handle SIGTERM events.
 212   void SigTermHandler(int signal_number);
 213 #endif
 214
 215   // Called to initialize resources on the UI thread.
 216   void StartOnUiThread();
 217
 218   // Initializes IPC control channel and config file path from |cmd_line|.
 219   // Called on the UI thread.
 220   bool InitWithCommandLine(const base::CommandLine* cmd_line);
 221
 222   // Called on the UI thread to start monitoring the configuration file.
 223   void StartWatchingConfigChanges();
 224
 225   // Called on the network thread to set the host's Authenticator factory.
 226   void CreateAuthenticatorFactory();
 227
 228   // Tear down resources that run on the UI thread.
 229   void ShutdownOnUiThread();
 230
 231   // Applies the host config, returning true if successful.
 232   bool ApplyConfig(scoped_ptr<JsonHostConfig> config);
 233
 234   // Handles policy updates, by calling On*PolicyUpdate methods.
 235   void OnPolicyUpdate(scoped_ptr<base::DictionaryValue> policies);
 236   void ApplyHostDomainPolicy();
 237   void ApplyUsernamePolicy();
 238   bool OnHostDomainPolicyUpdate(base::DictionaryValue* policies);
 239   bool OnUsernamePolicyUpdate(base::DictionaryValue* policies);
 240   bool OnNatPolicyUpdate(base::DictionaryValue* policies);
 241   bool OnRelayPolicyUpdate(base::DictionaryValue* policies);
 242   bool OnUdpPortPolicyUpdate(base::DictionaryValue* policies);
 243   bool OnCurtainPolicyUpdate(base::DictionaryValue* policies);
 244   bool OnHostTalkGadgetPrefixPolicyUpdate(base::DictionaryValue* policies);
 245   bool OnHostTokenUrlPolicyUpdate(base::DictionaryValue* policies);
 246   bool OnPairingPolicyUpdate(base::DictionaryValue* policies);
 247   bool OnGnubbyAuthPolicyUpdate(base::DictionaryValue* policies);
 248
 249   void StartHost();
 250
 251   void OnAuthFailed();
 252
 253   void RestartHost();
 254
 255   // Stops the host and shuts down the process with the specified |exit_code|.
 256   void ShutdownHost(HostExitCodes exit_code);
 257
 258   void ScheduleHostShutdown();
 259
 260   void ShutdownOnNetworkThread();
 261
 262   // Crashes the process in response to a daemon's request. The daemon passes
 263   // the location of the code that detected the fatal error resulted in this
 264   // request.
 265   void OnCrash(const std::string& function_name,
 266                const std::string& file_name,
 267                const int& line_number);
 268
 269   scoped_ptr<ChromotingHostContext> context_;
 270
 271   // Created on the UI thread but used from the network thread.
 272   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
 273
 274   // Accessed on the UI thread.
 275   scoped_ptr<IPC::ChannelProxy> daemon_channel_;
 276
 277   // XMPP server/remoting bot configuration (initialized from the command line).
 278   XmppSignalStrategy::XmppServerConfig xmpp_server_config_;
 279   std::string directory_bot_jid_;
 280
 281   // Created on the UI thread but used from the network thread.
 282   base::FilePath host_config_path_;
 283   std::string host_config_;
 284   scoped_ptr<DesktopEnvironmentFactory> desktop_environment_factory_;
 285
 286   // Accessed on the network thread.
 287   HostState state_;
 288
 289   scoped_ptr<ConfigWatcher> config_watcher_;
 290
 291   std::string host_id_;
 292   protocol::SharedSecretHash host_secret_hash_;
 293   scoped_refptr<RsaKeyPair> key_pair_;
 294   std::string oauth_refresh_token_;
 295   std::string serialized_config_;
 296   std::string host_owner_;
 297   bool use_service_account_;
 298   bool enable_vp9_;
 299   int64_t frame_recorder_buffer_size_;
 300
 301   scoped_ptr<policy_hack::PolicyWatcher> policy_watcher_;
 302   std::string host_domain_;
 303   bool host_username_match_required_;
 304   bool allow_nat_traversal_;
 305   bool allow_relay_;
 306   int min_udp_port_;
 307   int max_udp_port_;
 308   std::string talkgadget_prefix_;
 309   bool allow_pairing_;
 310
 311   bool curtain_required_;
 312   ThirdPartyAuthConfig third_party_auth_config_;
 313   bool enable_gnubby_auth_;
 314
 315   // Boolean to change flow, where ncessary, if we're
 316   // capturing a window instead of the entire desktop.
 317   bool enable_window_capture_;
 318
 319   // Used to specify which window to stream, if enabled.
 320   webrtc::WindowId window_id_;
 321
 322   scoped_ptr<OAuthTokenGetter> oauth_token_getter_;
 323   scoped_ptr<XmppSignalStrategy> signal_strategy_;
 324   scoped_ptr<SignalingConnector> signaling_connector_;
 325   scoped_ptr<HeartbeatSender> heartbeat_sender_;
 326   scoped_ptr<HostStatusSender> host_status_sender_;
 327   scoped_ptr<HostChangeNotificationListener> host_change_notification_listener_;
 328   scoped_ptr<HostStatusLogger> host_status_logger_;
 329   scoped_ptr<HostEventLogger> host_event_logger_;
 330
 331   scoped_ptr<ChromotingHost> host_;
 332
 333   // Used to keep this HostProcess alive until it is shutdown.
 334   scoped_refptr<HostProcess> self_;
 335
 336 #if defined(REMOTING_MULTI_PROCESS)
 337   DesktopSessionConnector* desktop_session_connector_;
 338 #endif  // defined(REMOTING_MULTI_PROCESS)
 339
 340   int* exit_code_out_;
 341   bool signal_parent_;
 342
 343   scoped_ptr<PairingRegistry::Delegate> pairing_registry_delegate_;
 344 };
 345
 346 HostProcess::HostProcess(scoped_ptr<ChromotingHostContext> context,
 347                          int* exit_code_out)
 348     : context_(context.Pass()),
 349       state_(HOST_INITIALIZING),
 350       use_service_account_(false),
 351       enable_vp9_(false),
 352       frame_recorder_buffer_size_(0),
 353       host_username_match_required_(false),
 354       allow_nat_traversal_(true),
 355       allow_relay_(true),
 356       min_udp_port_(0),
 357       max_udp_port_(0),
 358       allow_pairing_(true),
 359       curtain_required_(false),
 360       enable_gnubby_auth_(false),
 361       enable_window_capture_(false),
 362       window_id_(0),
 363 #if defined(REMOTING_MULTI_PROCESS)
 364       desktop_session_connector_(NULL),
 365 #endif  // defined(REMOTING_MULTI_PROCESS)
 366       self_(this),
 367       exit_code_out_(exit_code_out),
 368       signal_parent_(false) {
 369   StartOnUiThread();
 370 }
 371
 372 HostProcess::~HostProcess() {
 373   // Verify that UI components have been torn down.
 374   DCHECK(!config_watcher_);
 375   DCHECK(!daemon_channel_);
 376   DCHECK(!desktop_environment_factory_);
 377
 378   // We might be getting deleted on one of the threads the |host_context| owns,
 379   // so we need to post it back to the caller thread to safely join & delete the
 380   // threads it contains.  This will go away when we move to AutoThread.
 381   // |context_release()| will null |context_| before the method is invoked, so
 382   // we need to pull out the task-runner on which to call DeleteSoon first.
 383   scoped_refptr<base::SingleThreadTaskRunner> task_runner =
 384       context_->ui_task_runner();
 385   task_runner->DeleteSoon(FROM_HERE, context_.release());
 386 }
 387
 388 bool HostProcess::InitWithCommandLine(const base::CommandLine* cmd_line) {
 389 #if defined(REMOTING_MULTI_PROCESS)
 390   // Parse the handle value and convert it to a handle/file descriptor.
 391   std::string channel_name =
 392       cmd_line->GetSwitchValueASCII(kDaemonPipeSwitchName);
 393
 394   int pipe_handle = 0;
 395   if (channel_name.empty() ||
 396       !base::StringToInt(channel_name, &pipe_handle)) {
 397     LOG(ERROR) << "Invalid '" << kDaemonPipeSwitchName
 398                << "' value: " << channel_name;
 399     return false;
 400   }
 401
 402 #if defined(OS_WIN)
 403   base::win::ScopedHandle pipe(reinterpret_cast<HANDLE>(pipe_handle));
 404   IPC::ChannelHandle channel_handle(pipe);
 405 #elif defined(OS_POSIX)
 406   base::FileDescriptor pipe(pipe_handle, true);
 407   IPC::ChannelHandle channel_handle(channel_name, pipe);
 408 #endif  // defined(OS_POSIX)
 409
 410   // Connect to the daemon process.
 411   daemon_channel_ = IPC::ChannelProxy::Create(channel_handle,
 412                                               IPC::Channel::MODE_CLIENT,
 413                                               this,
 414                                               context_->network_task_runner());
 415 #else  // !defined(REMOTING_MULTI_PROCESS)
 416   // Connect to the daemon process.
 417   std::string channel_name =
 418       cmd_line->GetSwitchValueASCII(kDaemonPipeSwitchName);
 419   if (!channel_name.empty()) {
 420     daemon_channel_ =
 421         IPC::ChannelProxy::Create(channel_name,
 422                                   IPC::Channel::MODE_CLIENT,
 423                                   this,
 424                                   context_->network_task_runner().get());
 425   }
 426
 427   if (cmd_line->HasSwitch(kHostConfigSwitchName)) {
 428     host_config_path_ = cmd_line->GetSwitchValuePath(kHostConfigSwitchName);
 429
 430     // Read config from stdin if necessary.
 431     if (host_config_path_ == base::FilePath(kStdinConfigPath)) {
 432       char buf[4096];
 433       size_t len;
 434       while ((len = fread(buf, 1, sizeof(buf), stdin)) > 0) {
 435         host_config_.append(buf, len);
 436       }
 437     }
 438   } else {
 439     base::FilePath default_config_dir = remoting::GetConfigDir();
 440     host_config_path_ = default_config_dir.Append(kDefaultHostConfigFile);
 441   }
 442
 443   if (host_config_path_ != base::FilePath(kStdinConfigPath) &&
 444       !base::PathExists(host_config_path_)) {
 445     LOG(ERROR) << "Can't find host config at " << host_config_path_.value();
 446     return false;
 447   }
 448 #endif  // !defined(REMOTING_MULTI_PROCESS)
 449
 450   // Ignore certificate requests - the host currently has no client certificate
 451   // support, so ignoring certificate requests allows connecting to servers that
 452   // request, but don't require, a certificate (optional client authentication).
 453   net::URLFetcher::SetIgnoreCertificateRequests(true);
 454
 455   ServiceUrls* service_urls = ServiceUrls::GetInstance();
 456   bool xmpp_server_valid = net::ParseHostAndPort(
 457       service_urls->xmpp_server_address(),
 458       &xmpp_server_config_.host, &xmpp_server_config_.port);
 459   if (!xmpp_server_valid) {
 460     LOG(ERROR) << "Invalid XMPP server: " <<
 461         service_urls->xmpp_server_address();
 462     return false;
 463   }
 464   xmpp_server_config_.use_tls = service_urls->xmpp_server_use_tls();
 465   directory_bot_jid_ = service_urls->directory_bot_jid();
 466
 467   signal_parent_ = cmd_line->HasSwitch(kSignalParentSwitchName);
 468
 469   enable_window_capture_ = cmd_line->HasSwitch(kWindowIdSwitchName);
 470   if (enable_window_capture_) {
 471
 472 #if defined(OS_LINUX) || defined(OS_WIN)
 473     LOG(WARNING) << "Window capturing is not fully supported on Linux or "
 474                     "Windows.";
 475 #endif  // defined(OS_LINUX) || defined(OS_WIN)
 476
 477     // uint32_t is large enough to hold window IDs on all platforms.
 478     uint32_t window_id;
 479     if (base::StringToUint(
 480             cmd_line->GetSwitchValueASCII(kWindowIdSwitchName),
 481             &window_id)) {
 482       window_id_ = static_cast<webrtc::WindowId>(window_id);
 483     } else {
 484       LOG(ERROR) << "Window with window id: " << window_id_
 485                  << " not found. Shutting down host.";
 486       return false;
 487     }
 488   }
 489   return true;
 490 }
 491
 492 void HostProcess::OnConfigUpdated(
 493     const std::string& serialized_config) {
 494   if (!context_->network_task_runner()->BelongsToCurrentThread()) {
 495     context_->network_task_runner()->PostTask(FROM_HERE,
 496         base::Bind(&HostProcess::OnConfigUpdated, this, serialized_config));
 497     return;
 498   }
 499
 500   // Filter out duplicates.
 501   if (serialized_config_ == serialized_config)
 502     return;
 503
 504   HOST_LOG << "Processing new host configuration.";
 505
 506   serialized_config_ = serialized_config;
 507   scoped_ptr<JsonHostConfig> config(new JsonHostConfig(base::FilePath()));
 508   if (!config->SetSerializedData(serialized_config)) {
 509     LOG(ERROR) << "Invalid configuration.";
 510     ShutdownHost(kInvalidHostConfigurationExitCode);
 511     return;
 512   }
 513
 514   if (!ApplyConfig(config.Pass())) {
 515     LOG(ERROR) << "Failed to apply the configuration.";
 516     ShutdownHost(kInvalidHostConfigurationExitCode);
 517     return;
 518   }
 519
 520   if (state_ == HOST_INITIALIZING) {
 521     // TODO(sergeyu): Currently OnPolicyUpdate() assumes that host config is
 522     // already loaded so PolicyWatcher has to be started here. Separate policy
 523     // loading from policy verifications and move |policy_watcher_|
 524     // initialization to StartOnNetworkThread().
 525     policy_watcher_.reset(
 526         policy_hack::PolicyWatcher::Create(context_->file_task_runner()));
 527     policy_watcher_->StartWatching(
 528         base::Bind(&HostProcess::OnPolicyUpdate, base::Unretained(this)));
 529   } else {
 530     // Reapply policies that could be affected by a new config.
 531     ApplyHostDomainPolicy();
 532     ApplyUsernamePolicy();
 533
 534     if (state_ == HOST_STARTED) {
 535       // TODO(sergeyu): Here we assume that PIN is the only part of the config
 536       // that may change while the service is running. Change ApplyConfig() to
 537       // detect other changes in the config and restart host if necessary here.
 538       CreateAuthenticatorFactory();
 539     }
 540   }
 541 }
 542
 543 void HostProcess::OnConfigWatcherError() {
 544   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 545   ShutdownHost(kInvalidHostConfigurationExitCode);
 546 }
 547
 548 void HostProcess::StartOnNetworkThread() {
 549   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 550
 551 #if !defined(REMOTING_MULTI_PROCESS)
 552   if (host_config_path_ == base::FilePath(kStdinConfigPath)) {
 553     // Process config we've read from stdin.
 554     OnConfigUpdated(host_config_);
 555   } else {
 556     // Start watching the host configuration file.
 557     config_watcher_.reset(new ConfigFileWatcher(context_->network_task_runner(),
 558                                                 context_->file_task_runner(),
 559                                                 host_config_path_));
 560     config_watcher_->Watch(this);
 561   }
 562 #endif  // !defined(REMOTING_MULTI_PROCESS)
 563
 564 #if defined(OS_POSIX)
 565   remoting::RegisterSignalHandler(
 566       SIGTERM,
 567       base::Bind(&HostProcess::SigTermHandler, base::Unretained(this)));
 568 #endif  // defined(OS_POSIX)
 569 }
 570
 571 #if defined(OS_POSIX)
 572 void HostProcess::SigTermHandler(int signal_number) {
 573   DCHECK(signal_number == SIGTERM);
 574   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 575   HOST_LOG << "Caught SIGTERM: Shutting down...";
 576   ShutdownHost(kSuccessExitCode);
 577 }
 578 #endif  // OS_POSIX
 579
 580 void HostProcess::CreateAuthenticatorFactory() {
 581   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 582
 583   if (state_ != HOST_STARTED)
 584     return;
 585
 586   std::string local_certificate = key_pair_->GenerateCertificate();
 587   if (local_certificate.empty()) {
 588     LOG(ERROR) << "Failed to generate host certificate.";
 589     ShutdownHost(kInitializationFailed);
 590     return;
 591   }
 592
 593   scoped_refptr<PairingRegistry> pairing_registry = NULL;
 594   if (allow_pairing_) {
 595     if (!pairing_registry_delegate_)
 596       pairing_registry_delegate_ = CreatePairingRegistryDelegate();
 597
 598     if (pairing_registry_delegate_) {
 599       pairing_registry = new PairingRegistry(context_->file_task_runner(),
 600                                              pairing_registry_delegate_.Pass());
 601     }
 602   }
 603
 604   scoped_ptr<protocol::AuthenticatorFactory> factory;
 605
 606   if (third_party_auth_config_.is_empty()) {
 607     factory = protocol::Me2MeHostAuthenticatorFactory::CreateWithSharedSecret(
 608         use_service_account_, host_owner_, local_certificate, key_pair_,
 609         host_secret_hash_, pairing_registry);
 610
 611   } else if (third_party_auth_config_.is_valid()) {
 612     scoped_ptr<protocol::TokenValidatorFactory> token_validator_factory(
 613         new TokenValidatorFactoryImpl(
 614             third_party_auth_config_,
 615             key_pair_, context_->url_request_context_getter()));
 616     factory = protocol::Me2MeHostAuthenticatorFactory::CreateWithThirdPartyAuth(
 617         use_service_account_, host_owner_, local_certificate, key_pair_,
 618         token_validator_factory.Pass());
 619
 620   } else {
 621     // TODO(rmsousa): If the policy is bad the host should not go online. It
 622     // should keep running, but not connected, until the policies are fixed.
 623     // Having it show up as online and then reject all clients is misleading.
 624     LOG(ERROR) << "One of the third-party token URLs is empty or invalid. "
 625                << "Host will reject all clients until policies are corrected. "
 626                << "TokenUrl: " << third_party_auth_config_.token_url << ", "
 627                << "TokenValidationUrl: "
 628                << third_party_auth_config_.token_validation_url;
 629     factory = protocol::Me2MeHostAuthenticatorFactory::CreateRejecting();
 630   }
 631
 632 #if defined(OS_POSIX)
 633   // On Linux and Mac, perform a PAM authorization step after authentication.
 634   factory.reset(new PamAuthorizationFactory(factory.Pass()));
 635 #endif
 636   host_->SetAuthenticatorFactory(factory.Pass());
 637
 638   host_->set_pairing_registry(pairing_registry);
 639 }
 640
 641 // IPC::Listener implementation.
 642 bool HostProcess::OnMessageReceived(const IPC::Message& message) {
 643   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 644
 645 #if defined(REMOTING_MULTI_PROCESS)
 646   bool handled = true;
 647   IPC_BEGIN_MESSAGE_MAP(HostProcess, message)
 648     IPC_MESSAGE_HANDLER(ChromotingDaemonMsg_Crash, OnCrash)
 649     IPC_MESSAGE_HANDLER(ChromotingDaemonNetworkMsg_Configuration,
 650                         OnConfigUpdated)
 651     IPC_MESSAGE_HANDLER(ChromotingDaemonNetworkMsg_InitializePairingRegistry,
 652                         OnInitializePairingRegistry)
 653     IPC_MESSAGE_FORWARD(
 654         ChromotingDaemonNetworkMsg_DesktopAttached,
 655         desktop_session_connector_,
 656         DesktopSessionConnector::OnDesktopSessionAgentAttached)
 657     IPC_MESSAGE_FORWARD(ChromotingDaemonNetworkMsg_TerminalDisconnected,
 658                         desktop_session_connector_,
 659                         DesktopSessionConnector::OnTerminalDisconnected)
 660     IPC_MESSAGE_UNHANDLED(handled = false)
 661   IPC_END_MESSAGE_MAP()
 662
 663   CHECK(handled) << "Received unexpected IPC type: " << message.type();
 664   return handled;
 665
 666 #else  // !defined(REMOTING_MULTI_PROCESS)
 667   return false;
 668 #endif  // !defined(REMOTING_MULTI_PROCESS)
 669 }
 670
 671 void HostProcess::OnChannelError() {
 672   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 673
 674   // Shutdown the host if the daemon process disconnects the IPC channel.
 675   context_->network_task_runner()->PostTask(
 676       FROM_HERE,
 677       base::Bind(&HostProcess::ShutdownHost, this, kSuccessExitCode));
 678 }
 679
 680 void HostProcess::StartOnUiThread() {
 681   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 682
 683   if (!InitWithCommandLine(base::CommandLine::ForCurrentProcess())) {
 684     // Shutdown the host if the command line is invalid.
 685     context_->network_task_runner()->PostTask(
 686         FROM_HERE, base::Bind(&HostProcess::ShutdownHost, this,
 687                               kUsageExitCode));
 688     return;
 689   }
 690
 691 #if defined(OS_LINUX)
 692   // If an audio pipe is specific on the command-line then initialize
 693   // AudioCapturerLinux to capture from it.
 694   base::FilePath audio_pipe_name = base::CommandLine::ForCurrentProcess()->
 695       GetSwitchValuePath(kAudioPipeSwitchName);
 696   if (!audio_pipe_name.empty()) {
 697     remoting::AudioCapturerLinux::InitializePipeReader(
 698         context_->audio_task_runner(), audio_pipe_name);
 699   }
 700
 701   base::FilePath gnubby_socket_name = base::CommandLine::ForCurrentProcess()->
 702       GetSwitchValuePath(kAuthSocknameSwitchName);
 703   if (!gnubby_socket_name.empty())
 704     remoting::GnubbyAuthHandler::SetGnubbySocketName(gnubby_socket_name);
 705 #endif  // defined(OS_LINUX)
 706
 707   // Create a desktop environment factory appropriate to the build type &
 708   // platform.
 709 #if defined(OS_WIN)
 710   IpcDesktopEnvironmentFactory* desktop_environment_factory =
 711       new IpcDesktopEnvironmentFactory(
 712           context_->audio_task_runner(),
 713           context_->network_task_runner(),
 714           context_->video_capture_task_runner(),
 715           context_->network_task_runner(),
 716           daemon_channel_.get());
 717   desktop_session_connector_ = desktop_environment_factory;
 718 #else  // !defined(OS_WIN)
 719   DesktopEnvironmentFactory* desktop_environment_factory;
 720   if (enable_window_capture_) {
 721     desktop_environment_factory =
 722       new SingleWindowDesktopEnvironmentFactory(
 723           context_->network_task_runner(),
 724           context_->input_task_runner(),
 725           context_->ui_task_runner(),
 726           window_id_);
 727   } else {
 728     desktop_environment_factory =
 729       new Me2MeDesktopEnvironmentFactory(
 730           context_->network_task_runner(),
 731           context_->input_task_runner(),
 732           context_->ui_task_runner());
 733   }
 734 #endif  // !defined(OS_WIN)
 735
 736   desktop_environment_factory_.reset(desktop_environment_factory);
 737   desktop_environment_factory_->SetEnableGnubbyAuth(enable_gnubby_auth_);
 738
 739   context_->network_task_runner()->PostTask(
 740       FROM_HERE,
 741       base::Bind(&HostProcess::StartOnNetworkThread, this));
 742 }
 743
 744 void HostProcess::ShutdownOnUiThread() {
 745   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 746
 747   // Tear down resources that need to be torn down on the UI thread.
 748   network_change_notifier_.reset();
 749   daemon_channel_.reset();
 750   desktop_environment_factory_.reset();
 751
 752   // It is now safe for the HostProcess to be deleted.
 753   self_ = NULL;
 754
 755 #if defined(OS_LINUX)
 756   // Cause the global AudioPipeReader to be freed, otherwise the audio
 757   // thread will remain in-use and prevent the process from exiting.
 758   // TODO(wez): DesktopEnvironmentFactory should own the pipe reader.
 759   // See crbug.com/161373 and crbug.com/104544.
 760   AudioCapturerLinux::InitializePipeReader(NULL, base::FilePath());
 761 #endif
 762 }
 763
 764 // Overridden from HeartbeatSender::Listener
 765 void HostProcess::OnUnknownHostIdError() {
 766   LOG(ERROR) << "Host ID not found.";
 767   ShutdownHost(kInvalidHostIdExitCode);
 768 }
 769
 770 void HostProcess::OnHeartbeatSuccessful() {
 771   HOST_LOG << "Host ready to receive connections.";
 772 #if defined(OS_POSIX)
 773   if (signal_parent_) {
 774     kill(getppid(), SIGUSR1);
 775     signal_parent_ = false;
 776   }
 777 #endif
 778 }
 779
 780 void HostProcess::OnHostDeleted() {
 781   LOG(ERROR) << "Host was deleted from the directory.";
 782   ShutdownHost(kInvalidHostIdExitCode);
 783 }
 784
 785 void HostProcess::OnInitializePairingRegistry(
 786     IPC::PlatformFileForTransit privileged_key,
 787     IPC::PlatformFileForTransit unprivileged_key) {
 788   DCHECK(!pairing_registry_delegate_);
 789
 790 #if defined(OS_WIN)
 791   // Initialize the pairing registry delegate.
 792   scoped_ptr<PairingRegistryDelegateWin> delegate(
 793       new PairingRegistryDelegateWin());
 794   bool result = delegate->SetRootKeys(
 795       reinterpret_cast<HKEY>(
 796           IPC::PlatformFileForTransitToPlatformFile(privileged_key)),
 797       reinterpret_cast<HKEY>(
 798           IPC::PlatformFileForTransitToPlatformFile(unprivileged_key)));
 799   if (!result)
 800     return;
 801
 802   pairing_registry_delegate_ = delegate.PassAs<PairingRegistry::Delegate>();
 803 #else  // !defined(OS_WIN)
 804   NOTREACHED();
 805 #endif  // !defined(OS_WIN)
 806 }
 807
 808 // Applies the host config, returning true if successful.
 809 bool HostProcess::ApplyConfig(scoped_ptr<JsonHostConfig> config) {
 810   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 811
 812   if (!config->GetString(kHostIdConfigPath, &host_id_)) {
 813     LOG(ERROR) << "host_id is not defined in the config.";
 814     return false;
 815   }
 816
 817   std::string key_base64;
 818   if (!config->GetString(kPrivateKeyConfigPath, &key_base64)) {
 819     LOG(ERROR) << "Private key couldn't be read from the config file.";
 820     return false;
 821   }
 822
 823   key_pair_ = RsaKeyPair::FromString(key_base64);
 824   if (!key_pair_.get()) {
 825     LOG(ERROR) << "Invalid private key in the config file.";
 826     return false;
 827   }
 828
 829   std::string host_secret_hash_string;
 830   if (!config->GetString(kHostSecretHashConfigPath,
 831                          &host_secret_hash_string)) {
 832     host_secret_hash_string = "plain:";
 833   }
 834
 835   if (!host_secret_hash_.Parse(host_secret_hash_string)) {
 836     LOG(ERROR) << "Invalid host_secret_hash.";
 837     return false;
 838   }
 839
 840   // Use an XMPP connection to the Talk network for session signalling.
 841   if (!config->GetString(kXmppLoginConfigPath, &xmpp_server_config_.username) ||
 842       !(config->GetString(kXmppAuthTokenConfigPath,
 843                           &xmpp_server_config_.auth_token) ||
 844         config->GetString(kOAuthRefreshTokenConfigPath,
 845                           &oauth_refresh_token_))) {
 846     LOG(ERROR) << "XMPP credentials are not defined in the config.";
 847     return false;
 848   }
 849
 850   if (!oauth_refresh_token_.empty()) {
 851     // SignalingConnector is responsible for getting OAuth token.
 852     xmpp_server_config_.auth_token = "";
 853     xmpp_server_config_.auth_service = "oauth2";
 854   } else if (!config->GetString(kXmppAuthServiceConfigPath,
 855                                 &xmpp_server_config_.auth_service)) {
 856     // For the me2me host, we default to ClientLogin token for chromiumsync
 857     // because earlier versions of the host had no HTTP stack with which to
 858     // request an OAuth2 access token.
 859     xmpp_server_config_.auth_service = kChromotingTokenDefaultServiceName;
 860   }
 861
 862   if (config->GetString(kHostOwnerConfigPath, &host_owner_)) {
 863     // Service account configs have a host_owner, different from the xmpp_login.
 864     use_service_account_ = true;
 865   } else {
 866     // User credential configs only have an xmpp_login, which is also the owner.
 867     host_owner_ = xmpp_server_config_.username;
 868     use_service_account_ = false;
 869   }
 870
 871   // Allow offering of VP9 encoding to be overridden by the command-line.
 872   if (CommandLine::ForCurrentProcess()->HasSwitch(kEnableVp9SwitchName)) {
 873     enable_vp9_ = true;
 874   } else {
 875     config->GetBoolean(kEnableVp9ConfigPath, &enable_vp9_);
 876   }
 877
 878   // Allow the command-line to override the size of the frame recorder buffer.
 879   std::string frame_recorder_buffer_kb;
 880   if (CommandLine::ForCurrentProcess()->HasSwitch(
 881           kFrameRecorderBufferKbName)) {
 882     frame_recorder_buffer_kb =
 883         CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
 884             kFrameRecorderBufferKbName);
 885   } else {
 886     config->GetString(kFrameRecorderBufferKbConfigPath,
 887                       &frame_recorder_buffer_kb);
 888   }
 889   if (!frame_recorder_buffer_kb.empty()) {
 890     int buffer_kb = 0;
 891     if (base::StringToInt(frame_recorder_buffer_kb, &buffer_kb)) {
 892       frame_recorder_buffer_size_ = 1024LL * buffer_kb;
 893     }
 894   }
 895
 896   return true;
 897 }
 898
 899 void HostProcess::OnPolicyUpdate(scoped_ptr<base::DictionaryValue> policies) {
 900   if (!context_->network_task_runner()->BelongsToCurrentThread()) {
 901     context_->network_task_runner()->PostTask(FROM_HERE, base::Bind(
 902         &HostProcess::OnPolicyUpdate, this, base::Passed(&policies)));
 903     return;
 904   }
 905
 906   bool restart_required = false;
 907   restart_required |= OnHostDomainPolicyUpdate(policies.get());
 908   restart_required |= OnCurtainPolicyUpdate(policies.get());
 909   // Note: UsernamePolicyUpdate must run after OnCurtainPolicyUpdate.
 910   restart_required |= OnUsernamePolicyUpdate(policies.get());
 911   restart_required |= OnNatPolicyUpdate(policies.get());
 912   restart_required |= OnRelayPolicyUpdate(policies.get());
 913   restart_required |= OnUdpPortPolicyUpdate(policies.get());
 914   restart_required |= OnHostTalkGadgetPrefixPolicyUpdate(policies.get());
 915   restart_required |= OnHostTokenUrlPolicyUpdate(policies.get());
 916   restart_required |= OnPairingPolicyUpdate(policies.get());
 917   restart_required |= OnGnubbyAuthPolicyUpdate(policies.get());
 918
 919   if (state_ == HOST_INITIALIZING) {
 920     StartHost();
 921   } else if (state_ == HOST_STARTED && restart_required) {
 922     RestartHost();
 923   }
 924 }
 925
 926 void HostProcess::ApplyHostDomainPolicy() {
 927   HOST_LOG << "Policy sets host domain: " << host_domain_;
 928   if (!host_domain_.empty() &&
 929       !EndsWith(host_owner_, std::string("@") + host_domain_, false)) {
 930     LOG(ERROR) << "The host domain does not match the policy.";
 931     ShutdownHost(kInvalidHostDomainExitCode);
 932   }
 933 }
 934
 935 bool HostProcess::OnHostDomainPolicyUpdate(base::DictionaryValue* policies) {
 936   // Returns true if the host has to be restarted after this policy update.
 937   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 938
 939   if (!policies->GetString(policy_hack::PolicyWatcher::kHostDomainPolicyName,
 940                           &host_domain_)) {
 941     return false;
 942   }
 943
 944   ApplyHostDomainPolicy();
 945   return false;
 946 }
 947
 948 void HostProcess::ApplyUsernamePolicy() {
 949   if (host_username_match_required_) {
 950     HOST_LOG << "Policy requires host username match.";
 951     std::string username = GetUsername();
 952     bool shutdown = username.empty() ||
 953         !StartsWithASCII(host_owner_, username + std::string("@"),
 954                          false);
 955
 956 #if defined(OS_MACOSX)
 957     // On Mac, we run as root at the login screen, so the username won't match.
 958     // However, there's no need to enforce the policy at the login screen, as
 959     // the client will have to reconnect if a login occurs.
 960     if (shutdown && getuid() == 0) {
 961       shutdown = false;
 962     }
 963 #endif
 964
 965     // Curtain-mode on Windows presents the standard OS login prompt to the user
 966     // for each connection, removing the need for an explicit user-name matching
 967     // check.
 968 #if defined(OS_WIN) && defined(REMOTING_RDP_SESSION)
 969     if (curtain_required_)
 970       return;
 971 #endif  // defined(OS_WIN) && defined(REMOTING_RDP_SESSION)
 972
 973     // Shutdown the host if the username does not match.
 974     if (shutdown) {
 975       LOG(ERROR) << "The host username does not match.";
 976       ShutdownHost(kUsernameMismatchExitCode);
 977     }
 978   } else {
 979     HOST_LOG << "Policy does not require host username match.";
 980   }
 981 }
 982
 983 bool HostProcess::OnUsernamePolicyUpdate(base::DictionaryValue* policies) {
 984   // Returns false: never restart the host after this policy update.
 985   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 986
 987   if (!policies->GetBoolean(
 988       policy_hack::PolicyWatcher::kHostMatchUsernamePolicyName,
 989       &host_username_match_required_)) {
 990     return false;
 991   }
 992
 993   ApplyUsernamePolicy();
 994   return false;
 995 }
 996
 997 bool HostProcess::OnNatPolicyUpdate(base::DictionaryValue* policies) {
 998   // Returns true if the host has to be restarted after this policy update.
 999   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1000
1001   if (!policies->GetBoolean(policy_hack::PolicyWatcher::kNatPolicyName,
1002                            &allow_nat_traversal_)) {
1003     return false;
1004   }
1005
1006   if (allow_nat_traversal_) {
1007     HOST_LOG << "Policy enables NAT traversal.";
1008   } else {
1009     HOST_LOG << "Policy disables NAT traversal.";
1010   }
1011   return true;
1012 }
1013
1014 bool HostProcess::OnRelayPolicyUpdate(base::DictionaryValue* policies) {
1015   // Returns true if the host has to be restarted after this policy update.
1016   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1017
1018   if (!policies->GetBoolean(policy_hack::PolicyWatcher::kRelayPolicyName,
1019                            &allow_relay_)) {
1020     return false;
1021   }
1022
1023   if (allow_relay_) {
1024     HOST_LOG << "Policy enables use of relay server.";
1025   } else {
1026     HOST_LOG << "Policy disables use of relay server.";
1027   }
1028   return true;
1029 }
1030
1031 bool HostProcess::OnUdpPortPolicyUpdate(base::DictionaryValue* policies) {
1032   // Returns true if the host has to be restarted after this policy update.
1033   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1034
1035   std::string udp_port_range;
1036   if (!policies->GetString(policy_hack::PolicyWatcher::kUdpPortRangePolicyName,
1037                            &udp_port_range)) {
1038     return false;
1039   }
1040
1041   // Use default values if policy setting is empty or invalid.
1042   int min_udp_port = 0;
1043   int max_udp_port = 0;
1044   if (!udp_port_range.empty() &&
1045       !NetworkSettings::ParsePortRange(udp_port_range, &min_udp_port,
1046                                        &max_udp_port)) {
1047     LOG(WARNING) << "Invalid port range policy: \"" << udp_port_range
1048                  << "\". Using default values.";
1049   }
1050
1051   if (min_udp_port_ != min_udp_port || max_udp_port_ != max_udp_port) {
1052     if (min_udp_port != 0 && max_udp_port != 0) {
1053       HOST_LOG << "Policy restricts UDP port range to [" << min_udp_port
1054                << ", " << max_udp_port << "]";
1055     } else {
1056       HOST_LOG << "Policy does not restrict UDP port range.";
1057     }
1058     min_udp_port_ = min_udp_port;
1059     max_udp_port_ = max_udp_port;
1060     return true;
1061   }
1062   return false;
1063 }
1064
1065 bool HostProcess::OnCurtainPolicyUpdate(base::DictionaryValue* policies) {
1066   // Returns true if the host has to be restarted after this policy update.
1067   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1068
1069   if (!policies->GetBoolean(
1070           policy_hack::PolicyWatcher::kHostRequireCurtainPolicyName,
1071           &curtain_required_)) {
1072     return false;
1073   }
1074
1075 #if defined(OS_MACOSX)
1076   if (curtain_required_) {
1077     // When curtain mode is in effect on Mac, the host process runs in the
1078     // user's switched-out session, but launchd will also run an instance at
1079     // the console login screen.  Even if no user is currently logged-on, we
1080     // can't support remote-access to the login screen because the current host
1081     // process model disconnects the client during login, which would leave
1082     // the logged in session un-curtained on the console until they reconnect.
1083     //
1084     // TODO(jamiewalch): Fix this once we have implemented the multi-process
1085     // daemon architecture (crbug.com/134894)
1086     if (getuid() == 0) {
1087       LOG(ERROR) << "Running the host in the console login session is yet not "
1088                     "supported.";
1089       ShutdownHost(kLoginScreenNotSupportedExitCode);
1090       return false;
1091     }
1092   }
1093 #endif
1094
1095   if (curtain_required_) {
1096     HOST_LOG << "Policy requires curtain-mode.";
1097   } else {
1098     HOST_LOG << "Policy does not require curtain-mode.";
1099   }
1100
1101   if (host_)
1102     host_->SetEnableCurtaining(curtain_required_);
1103   return false;
1104 }
1105
1106 bool HostProcess::OnHostTalkGadgetPrefixPolicyUpdate(
1107     base::DictionaryValue* policies) {
1108   // Returns true if the host has to be restarted after this policy update.
1109   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1110
1111   if (!policies->GetString(
1112           policy_hack::PolicyWatcher::kHostTalkGadgetPrefixPolicyName,
1113           &talkgadget_prefix_)) {
1114     return false;
1115   }
1116
1117   HOST_LOG << "Policy sets talkgadget prefix: " << talkgadget_prefix_;
1118   return true;
1119 }
1120
1121 bool HostProcess::OnHostTokenUrlPolicyUpdate(base::DictionaryValue* policies) {
1122   // Returns true if the host has to be restarted after this policy update.
1123   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1124
1125   bool token_policy_changed = false;
1126   std::string token_url_string;
1127   if (policies->GetString(
1128           policy_hack::PolicyWatcher::kHostTokenUrlPolicyName,
1129           &token_url_string)) {
1130     token_policy_changed = true;
1131     third_party_auth_config_.token_url = GURL(token_url_string);
1132   }
1133   std::string token_validation_url_string;
1134   if (policies->GetString(
1135           policy_hack::PolicyWatcher::kHostTokenValidationUrlPolicyName,
1136           &token_validation_url_string)) {
1137     token_policy_changed = true;
1138     third_party_auth_config_.token_validation_url =
1139         GURL(token_validation_url_string);
1140   }
1141   if (policies->GetString(
1142           policy_hack::PolicyWatcher::kHostTokenValidationCertIssuerPolicyName,
1143           &third_party_auth_config_.token_validation_cert_issuer)) {
1144     token_policy_changed = true;
1145   }
1146
1147   if (token_policy_changed) {
1148     HOST_LOG << "Policy sets third-party token URLs: "
1149              << "TokenUrl: "
1150              << third_party_auth_config_.token_url << ", "
1151              << "TokenValidationUrl: "
1152              << third_party_auth_config_.token_validation_url << ", "
1153              << "TokenValidationCertificateIssuer: "
1154              << third_party_auth_config_.token_validation_cert_issuer;
1155   }
1156   return token_policy_changed;
1157 }
1158
1159 bool HostProcess::OnPairingPolicyUpdate(base::DictionaryValue* policies) {
1160   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1161
1162   if (!policies->GetBoolean(
1163           policy_hack::PolicyWatcher::kHostAllowClientPairing,
1164           &allow_pairing_)) {
1165     return false;
1166   }
1167
1168   if (allow_pairing_) {
1169     HOST_LOG << "Policy enables client pairing.";
1170   } else {
1171     HOST_LOG << "Policy disables client pairing.";
1172   }
1173   return true;
1174 }
1175
1176 bool HostProcess::OnGnubbyAuthPolicyUpdate(base::DictionaryValue* policies) {
1177   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1178
1179   if (!policies->GetBoolean(
1180           policy_hack::PolicyWatcher::kHostAllowGnubbyAuthPolicyName,
1181           &enable_gnubby_auth_)) {
1182     return false;
1183   }
1184
1185   if (enable_gnubby_auth_) {
1186     HOST_LOG << "Policy enables gnubby auth.";
1187   } else {
1188     HOST_LOG << "Policy disables gnubby auth.";
1189   }
1190
1191   if (desktop_environment_factory_)
1192     desktop_environment_factory_->SetEnableGnubbyAuth(enable_gnubby_auth_);
1193
1194   return true;
1195 }
1196
1197 void HostProcess::StartHost() {
1198   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1199   DCHECK(!host_);
1200   DCHECK(!signal_strategy_.get());
1201   DCHECK(state_ == HOST_INITIALIZING || state_ == HOST_STOPPING_TO_RESTART ||
1202          state_ == HOST_STOPPED) << state_;
1203   state_ = HOST_STARTED;
1204
1205   signal_strategy_.reset(
1206       new XmppSignalStrategy(net::ClientSocketFactory::GetDefaultFactory(),
1207                              context_->url_request_context_getter(),
1208                              xmpp_server_config_));
1209
1210   scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker(
1211       new DnsBlackholeChecker(context_->url_request_context_getter(),
1212                               talkgadget_prefix_));
1213
1214   // Create a NetworkChangeNotifier for use by the signaling connector.
1215   network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
1216
1217   signaling_connector_.reset(new SignalingConnector(
1218       signal_strategy_.get(),
1219       dns_blackhole_checker.Pass(),
1220       base::Bind(&HostProcess::OnAuthFailed, this)));
1221
1222   if (!oauth_refresh_token_.empty()) {
1223     scoped_ptr<OAuthTokenGetter::OAuthCredentials> oauth_credentials;
1224     oauth_credentials.reset(
1225         new OAuthTokenGetter::OAuthCredentials(
1226             xmpp_server_config_.username, oauth_refresh_token_,
1227             use_service_account_));
1228
1229     oauth_token_getter_.reset(new OAuthTokenGetter(
1230         oauth_credentials.Pass(), context_->url_request_context_getter(),
1231         false));
1232
1233     signaling_connector_->EnableOAuth(oauth_token_getter_.get());
1234   }
1235
1236   uint32 network_flags = 0;
1237   if (allow_nat_traversal_) {
1238     network_flags = NetworkSettings::NAT_TRAVERSAL_STUN |
1239                     NetworkSettings::NAT_TRAVERSAL_OUTGOING;
1240     if (allow_relay_)
1241       network_flags |= NetworkSettings::NAT_TRAVERSAL_RELAY;
1242   }
1243
1244   NetworkSettings network_settings(network_flags);
1245
1246   if (min_udp_port_ && max_udp_port_) {
1247     network_settings.min_port = min_udp_port_;
1248     network_settings.max_port = max_udp_port_;
1249   } else if (!allow_nat_traversal_) {
1250     // For legacy reasons we have to restrict the port range to a set of default
1251     // values when nat traversal is disabled, even if the port range was not
1252     // set in policy.
1253     network_settings.min_port = NetworkSettings::kDefaultMinPort;
1254     network_settings.max_port = NetworkSettings::kDefaultMaxPort;
1255   }
1256
1257   host_.reset(new ChromotingHost(
1258       signal_strategy_.get(),
1259       desktop_environment_factory_.get(),
1260       CreateHostSessionManager(signal_strategy_.get(), network_settings,
1261                                context_->url_request_context_getter()),
1262       context_->audio_task_runner(),
1263       context_->input_task_runner(),
1264       context_->video_capture_task_runner(),
1265       context_->video_encode_task_runner(),
1266       context_->network_task_runner(),
1267       context_->ui_task_runner()));
1268
1269   if (enable_vp9_) {
1270     scoped_ptr<protocol::CandidateSessionConfig> config =
1271         host_->protocol_config()->Clone();
1272     config->EnableVideoCodec(protocol::ChannelConfig::CODEC_VP9);
1273     host_->set_protocol_config(config.Pass());
1274   }
1275
1276   if (frame_recorder_buffer_size_ > 0) {
1277     scoped_ptr<VideoFrameRecorderHostExtension> frame_recorder_extension(
1278         new VideoFrameRecorderHostExtension());
1279     frame_recorder_extension->SetMaxContentBytes(frame_recorder_buffer_size_);
1280     host_->AddExtension(frame_recorder_extension.PassAs<HostExtension>());
1281   }
1282
1283   // TODO(simonmorris): Get the maximum session duration from a policy.
1284 #if defined(OS_LINUX)
1285   host_->SetMaximumSessionDuration(base::TimeDelta::FromHours(20));
1286 #endif
1287
1288   heartbeat_sender_.reset(new HeartbeatSender(
1289       this, host_id_, signal_strategy_.get(), key_pair_,
1290       directory_bot_jid_));
1291
1292   host_status_sender_.reset(new HostStatusSender(
1293       host_id_, signal_strategy_.get(), key_pair_, directory_bot_jid_));
1294
1295   host_change_notification_listener_.reset(new HostChangeNotificationListener(
1296       this, host_id_, signal_strategy_.get(), directory_bot_jid_));
1297
1298   host_status_logger_.reset(
1299       new HostStatusLogger(host_->AsWeakPtr(), ServerLogEntry::ME2ME,
1300                            signal_strategy_.get(), directory_bot_jid_));
1301
1302   // Set up reporting the host status notifications.
1303 #if defined(REMOTING_MULTI_PROCESS)
1304   host_event_logger_.reset(
1305       new IpcHostEventLogger(host_->AsWeakPtr(), daemon_channel_.get()));
1306 #else  // !defined(REMOTING_MULTI_PROCESS)
1307   host_event_logger_ =
1308       HostEventLogger::Create(host_->AsWeakPtr(), kApplicationName);
1309 #endif  // !defined(REMOTING_MULTI_PROCESS)
1310
1311   host_->SetEnableCurtaining(curtain_required_);
1312   host_->Start(host_owner_);
1313
1314   CreateAuthenticatorFactory();
1315 }
1316
1317 void HostProcess::OnAuthFailed() {
1318   ShutdownHost(kInvalidOauthCredentialsExitCode);
1319 }
1320
1321 void HostProcess::RestartHost() {
1322   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1323   DCHECK_EQ(state_, HOST_STARTED);
1324
1325   state_ = HOST_STOPPING_TO_RESTART;
1326   ShutdownOnNetworkThread();
1327 }
1328
1329 void HostProcess::ShutdownHost(HostExitCodes exit_code) {
1330   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1331
1332   *exit_code_out_ = exit_code;
1333
1334   switch (state_) {
1335     case HOST_INITIALIZING:
1336       state_ = HOST_STOPPING;
1337       ShutdownOnNetworkThread();
1338       break;
1339
1340     case HOST_STARTED:
1341       state_ = HOST_STOPPING;
1342       host_status_sender_->SendOfflineStatus(exit_code);
1343       ScheduleHostShutdown();
1344       break;
1345
1346     case HOST_STOPPING_TO_RESTART:
1347       state_ = HOST_STOPPING;
1348       break;
1349
1350     case HOST_STOPPING:
1351     case HOST_STOPPED:
1352       // Host is already stopped or being stopped. No action is required.
1353       break;
1354   }
1355 }
1356
1357 // TODO(weitaosu): shut down the host once we get an ACK for the offline status
1358 //                  XMPP message.
1359 void HostProcess::ScheduleHostShutdown() {
1360   // Delay the shutdown by 2 second to allow SendOfflineStatus to complete.
1361   context_->network_task_runner()->PostDelayedTask(
1362       FROM_HERE,
1363       base::Bind(&HostProcess::ShutdownOnNetworkThread, base::Unretained(this)),
1364       base::TimeDelta::FromSeconds(2));
1365 }
1366
1367 void HostProcess::ShutdownOnNetworkThread() {
1368   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
1369
1370   host_.reset();
1371   host_event_logger_.reset();
1372   host_status_logger_.reset();
1373   heartbeat_sender_.reset();
1374   host_status_sender_.reset();
1375   host_change_notification_listener_.reset();
1376   signaling_connector_.reset();
1377   oauth_token_getter_.reset();
1378   signal_strategy_.reset();
1379   network_change_notifier_.reset();
1380
1381   if (state_ == HOST_STOPPING_TO_RESTART) {
1382     StartHost();
1383   } else if (state_ == HOST_STOPPING) {
1384     state_ = HOST_STOPPED;
1385
1386     if (policy_watcher_.get()) {
1387       base::WaitableEvent done_event(true, false);
1388       policy_watcher_->StopWatching(&done_event);
1389       done_event.Wait();
1390       policy_watcher_.reset();
1391     }
1392
1393     config_watcher_.reset();
1394
1395     // Complete the rest of shutdown on the main thread.
1396     context_->ui_task_runner()->PostTask(
1397         FROM_HERE,
1398         base::Bind(&HostProcess::ShutdownOnUiThread, this));
1399   } else {
1400     // This method is only called in STOPPING_TO_RESTART and STOPPING states.
1401     NOTREACHED();
1402   }
1403 }
1404
1405 void HostProcess::OnCrash(const std::string& function_name,
1406                           const std::string& file_name,
1407                           const int& line_number) {
1408   char message[1024];
1409   base::snprintf(message, sizeof(message),
1410                  "Requested by %s at %s, line %d.",
1411                  function_name.c_str(), file_name.c_str(), line_number);
1412   base::debug::Alias(message);
1413
1414   // The daemon requested us to crash the process.
1415   CHECK(false) << message;
1416 }
1417
1418 int HostProcessMain() {
1419 #if defined(OS_LINUX)
1420   // Required for any calls into GTK functions, such as the Disconnect and
1421   // Continue windows, though these should not be used for the Me2Me case
1422   // (crbug.com/104377).
1423   gtk_init(NULL, NULL);
1424 #endif
1425
1426   // Enable support for SSL server sockets, which must be done while still
1427   // single-threaded.
1428   net::EnableSSLServerSockets();
1429
1430   // Ensures runtime specific CPU features are initialized.
1431   media::InitializeCPUSpecificMediaFeatures();
1432
1433   // Create the main message loop and start helper threads.
1434   base::MessageLoopForUI message_loop;
1435   scoped_ptr<ChromotingHostContext> context =
1436       ChromotingHostContext::Create(new AutoThreadTaskRunner(
1437           message_loop.message_loop_proxy(), base::MessageLoop::QuitClosure()));
1438   if (!context)
1439     return kInitializationFailed;
1440
1441   // Create & start the HostProcess using these threads.
1442   // TODO(wez): The HostProcess holds a reference to itself until Shutdown().
1443   // Remove this hack as part of the multi-process refactoring.
1444   int exit_code = kSuccessExitCode;
1445   new HostProcess(context.Pass(), &exit_code);
1446
1447   // Run the main (also UI) message loop until the host no longer needs it.
1448   message_loop.Run();
1449
1450   return exit_code;
1451 }
1452
1453 }  // namespace remoting