content/browser/ppapi_plugin_process_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 #include "content/browser/ppapi_plugin_process_host.h"
   6
   7 #include <string>
   8
   9 #include "base/base_switches.h"
  10 #include "base/command_line.h"
  11 #include "base/files/file_path.h"
  12 #include "base/metrics/field_trial.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "content/browser/browser_child_process_host_impl.h"
  15 #include "content/browser/plugin_service_impl.h"
  16 #include "content/browser/renderer_host/render_message_filter.h"
  17 #include "content/common/child_process_host_impl.h"
  18 #include "content/common/child_process_messages.h"
  19 #include "content/public/browser/content_browser_client.h"
  20 #include "content/public/common/content_constants.h"
  21 #include "content/public/common/content_switches.h"
  22 #include "content/public/common/pepper_plugin_info.h"
  23 #include "content/public/common/process_type.h"
  24 #include "content/public/common/sandboxed_process_launcher_delegate.h"
  25 #include "ipc/ipc_switches.h"
  26 #include "net/base/network_change_notifier.h"
  27 #include "ppapi/proxy/ppapi_messages.h"
  28 #include "ui/base/ui_base_switches.h"
  29
  30 #if defined(OS_WIN)
  31 #include "content/common/sandbox_win.h"
  32 #include "sandbox/win/src/sandbox_policy.h"
  33 #endif
  34
  35 namespace content {
  36
  37 // NOTE: changes to this class need to be reviewed by the security team.
  38 class PpapiPluginSandboxedProcessLauncherDelegate
  39     : public content::SandboxedProcessLauncherDelegate {
  40  public:
  41   PpapiPluginSandboxedProcessLauncherDelegate(bool is_broker,
  42                                               const PepperPluginInfo& info,
  43                                               ChildProcessHost* host)
  44       :
  45 #if defined(OS_POSIX)
  46         info_(info),
  47         ipc_fd_(host->TakeClientFileDescriptor()),
  48 #endif  // OS_POSIX
  49         is_broker_(is_broker) {}
  50
  51   ~PpapiPluginSandboxedProcessLauncherDelegate() override {}
  52
  53 #if defined(OS_WIN)
  54   virtual bool ShouldSandbox() override {
  55     return !is_broker_;
  56   }
  57
  58   virtual void PreSpawnTarget(sandbox::TargetPolicy* policy,
  59                               bool* success) {
  60     if (is_broker_)
  61       return;
  62     // The Pepper process as locked-down as a renderer execpt that it can
  63     // create the server side of chrome pipes.
  64     sandbox::ResultCode result;
  65     result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_NAMED_PIPES,
  66                              sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY,
  67                              L"\\\\.\\pipe\\chrome.*");
  68     *success = (result == sandbox::SBOX_ALL_OK);
  69   }
  70
  71 #elif defined(OS_POSIX)
  72   bool ShouldUseZygote() override {
  73     const base::CommandLine& browser_command_line =
  74         *base::CommandLine::ForCurrentProcess();
  75     base::CommandLine::StringType plugin_launcher = browser_command_line
  76         .GetSwitchValueNative(switches::kPpapiPluginLauncher);
  77     return !is_broker_ && plugin_launcher.empty() && info_.is_sandboxed;
  78   }
  79   base::ScopedFD TakeIpcFd() override { return ipc_fd_.Pass(); }
  80 #endif  // OS_WIN
  81
  82  private:
  83 #if defined(OS_POSIX)
  84   const PepperPluginInfo& info_;
  85   base::ScopedFD ipc_fd_;
  86 #endif  // OS_POSIX
  87   bool is_broker_;
  88
  89   DISALLOW_COPY_AND_ASSIGN(PpapiPluginSandboxedProcessLauncherDelegate);
  90 };
  91
  92 class PpapiPluginProcessHost::PluginNetworkObserver
  93     : public net::NetworkChangeNotifier::IPAddressObserver,
  94       public net::NetworkChangeNotifier::ConnectionTypeObserver {
  95  public:
  96   explicit PluginNetworkObserver(PpapiPluginProcessHost* process_host)
  97       : process_host_(process_host) {
  98     net::NetworkChangeNotifier::AddIPAddressObserver(this);
  99     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 100   }
 101
 102   ~PluginNetworkObserver() override {
 103     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 104     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 105   }
 106
 107   // IPAddressObserver implementation.
 108   void OnIPAddressChanged() override {
 109     // TODO(brettw) bug 90246: This doesn't seem correct. The online/offline
 110     // notification seems like it should be sufficient, but I don't see that
 111     // when I unplug and replug my network cable. Sending this notification when
 112     // "something" changes seems to make Flash reasonably happy, but seems
 113     // wrong. We should really be able to provide the real online state in
 114     // OnConnectionTypeChanged().
 115     process_host_->Send(new PpapiMsg_SetNetworkState(true));
 116   }
 117
 118   // ConnectionTypeObserver implementation.
 119   void OnConnectionTypeChanged(
 120       net::NetworkChangeNotifier::ConnectionType type) override {
 121     process_host_->Send(new PpapiMsg_SetNetworkState(
 122         type != net::NetworkChangeNotifier::CONNECTION_NONE));
 123   }
 124
 125  private:
 126   PpapiPluginProcessHost* const process_host_;
 127 };
 128
 129 PpapiPluginProcessHost::~PpapiPluginProcessHost() {
 130   DVLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
 131            << "~PpapiPluginProcessHost()";
 132   CancelRequests();
 133 }
 134
 135 // static
 136 PpapiPluginProcessHost* PpapiPluginProcessHost::CreatePluginHost(
 137     const PepperPluginInfo& info,
 138     const base::FilePath& profile_data_directory) {
 139   PpapiPluginProcessHost* plugin_host = new PpapiPluginProcessHost(
 140       info, profile_data_directory);
 141   DCHECK(plugin_host);
 142   if (plugin_host->Init(info))
 143     return plugin_host;
 144
 145   NOTREACHED();  // Init is not expected to fail.
 146   return NULL;
 147 }
 148
 149 // static
 150 PpapiPluginProcessHost* PpapiPluginProcessHost::CreateBrokerHost(
 151     const PepperPluginInfo& info) {
 152   PpapiPluginProcessHost* plugin_host =
 153       new PpapiPluginProcessHost();
 154   if (plugin_host->Init(info))
 155     return plugin_host;
 156
 157   NOTREACHED();  // Init is not expected to fail.
 158   return NULL;
 159 }
 160
 161 // static
 162 void PpapiPluginProcessHost::DidCreateOutOfProcessInstance(
 163     int plugin_process_id,
 164     int32 pp_instance,
 165     const PepperRendererInstanceData& instance_data) {
 166   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 167     if (iter->process_.get() &&
 168         iter->process_->GetData().id == plugin_process_id) {
 169       // Found the plugin.
 170       iter->host_impl_->AddInstance(pp_instance, instance_data);
 171       return;
 172     }
 173   }
 174   // We'll see this passed with a 0 process ID for the browser tag stuff that
 175   // is currently in the process of being removed.
 176   //
 177   // TODO(brettw) When old browser tag impl is removed
 178   // (PepperPluginDelegateImpl::CreateBrowserPluginModule passes a 0 plugin
 179   // process ID) this should be converted to a NOTREACHED().
 180   DCHECK(plugin_process_id == 0)
 181       << "Renderer sent a bad plugin process host ID";
 182 }
 183
 184 // static
 185 void PpapiPluginProcessHost::DidDeleteOutOfProcessInstance(
 186     int plugin_process_id,
 187     int32 pp_instance) {
 188   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 189     if (iter->process_.get() &&
 190         iter->process_->GetData().id == plugin_process_id) {
 191       // Found the plugin.
 192       iter->host_impl_->DeleteInstance(pp_instance);
 193       return;
 194     }
 195   }
 196   // Note: It's possible that the plugin process has already been deleted by
 197   // the time this message is received. For example, it could have crashed.
 198   // That's OK, we can just ignore this message.
 199 }
 200
 201 // static
 202 void PpapiPluginProcessHost::OnPluginInstanceThrottleStateChange(
 203     int plugin_process_id,
 204     int32 pp_instance,
 205     bool is_throttled) {
 206   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 207     if (iter->process_.get() &&
 208         iter->process_->GetData().id == plugin_process_id) {
 209       // Found the plugin.
 210       iter->host_impl_->OnThrottleStateChanged(pp_instance, is_throttled);
 211       return;
 212     }
 213   }
 214   // Note: It's possible that the plugin process has already been deleted by
 215   // the time this message is received. For example, it could have crashed.
 216   // That's OK, we can just ignore this message.
 217 }
 218
 219 // static
 220 void PpapiPluginProcessHost::FindByName(
 221     const base::string16& name,
 222     std::vector<PpapiPluginProcessHost*>* hosts) {
 223   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 224     if (iter->process_.get() && iter->process_->GetData().name == name)
 225       hosts->push_back(*iter);
 226   }
 227 }
 228
 229 bool PpapiPluginProcessHost::Send(IPC::Message* message) {
 230   return process_->Send(message);
 231 }
 232
 233 void PpapiPluginProcessHost::OpenChannelToPlugin(Client* client) {
 234   if (process_->GetHost()->IsChannelOpening()) {
 235     // The channel is already in the process of being opened.  Put
 236     // this "open channel" request into a queue of requests that will
 237     // be run once the channel is open.
 238     pending_requests_.push_back(client);
 239     return;
 240   }
 241
 242   // We already have an open channel, send a request right away to plugin.
 243   RequestPluginChannel(client);
 244 }
 245
 246 PpapiPluginProcessHost::PpapiPluginProcessHost(
 247     const PepperPluginInfo& info,
 248     const base::FilePath& profile_data_directory)
 249     : profile_data_directory_(profile_data_directory),
 250       is_broker_(false) {
 251   uint32 base_permissions = info.permissions;
 252
 253   // We don't have to do any whitelisting for APIs in this process host, so
 254   // don't bother passing a browser context or document url here.
 255   if (GetContentClient()->browser()->IsPluginAllowedToUseDevChannelAPIs(
 256           NULL, GURL()))
 257     base_permissions |= ppapi::PERMISSION_DEV_CHANNEL;
 258   permissions_ = ppapi::PpapiPermissions::GetForCommandLine(base_permissions);
 259
 260   process_.reset(new BrowserChildProcessHostImpl(
 261       PROCESS_TYPE_PPAPI_PLUGIN, this));
 262
 263   host_impl_.reset(new BrowserPpapiHostImpl(this, permissions_, info.name,
 264                                             info.path, profile_data_directory,
 265                                             false /* in_process */,
 266                                             false /* external_plugin */));
 267
 268   filter_ = new PepperMessageFilter();
 269   process_->AddFilter(filter_.get());
 270   process_->GetHost()->AddFilter(host_impl_->message_filter().get());
 271
 272   GetContentClient()->browser()->DidCreatePpapiPlugin(host_impl_.get());
 273
 274   // Only request network status updates if the plugin has dev permissions.
 275   if (permissions_.HasPermission(ppapi::PERMISSION_DEV))
 276     network_observer_.reset(new PluginNetworkObserver(this));
 277 }
 278
 279 PpapiPluginProcessHost::PpapiPluginProcessHost()
 280     : is_broker_(true) {
 281   process_.reset(new BrowserChildProcessHostImpl(
 282       PROCESS_TYPE_PPAPI_BROKER, this));
 283
 284   ppapi::PpapiPermissions permissions;  // No permissions.
 285   // The plugin name, path and profile data directory shouldn't be needed for
 286   // the broker.
 287   host_impl_.reset(new BrowserPpapiHostImpl(this, permissions,
 288                                             std::string(), base::FilePath(),
 289                                             base::FilePath(),
 290                                             false /* in_process */,
 291                                             false /* external_plugin */));
 292 }
 293
 294 bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
 295   plugin_path_ = info.path;
 296   if (info.name.empty()) {
 297     process_->SetName(plugin_path_.BaseName().LossyDisplayName());
 298   } else {
 299     process_->SetName(base::UTF8ToUTF16(info.name));
 300   }
 301
 302   std::string channel_id = process_->GetHost()->CreateChannel();
 303   if (channel_id.empty()) {
 304     VLOG(1) << "Could not create pepper host channel.";
 305     return false;
 306   }
 307
 308   const base::CommandLine& browser_command_line =
 309       *base::CommandLine::ForCurrentProcess();
 310   base::CommandLine::StringType plugin_launcher =
 311       browser_command_line.GetSwitchValueNative(switches::kPpapiPluginLauncher);
 312
 313 #if defined(OS_LINUX)
 314   int flags = plugin_launcher.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
 315                                         ChildProcessHost::CHILD_NORMAL;
 316 #else
 317   int flags = ChildProcessHost::CHILD_NORMAL;
 318 #endif
 319   base::FilePath exe_path = ChildProcessHost::GetChildPath(flags);
 320   if (exe_path.empty()) {
 321     VLOG(1) << "Pepper plugin exe path is empty.";
 322     return false;
 323   }
 324
 325   base::CommandLine* cmd_line = new base::CommandLine(exe_path);
 326   cmd_line->AppendSwitchASCII(switches::kProcessType,
 327                               is_broker_ ? switches::kPpapiBrokerProcess
 328                                          : switches::kPpapiPluginProcess);
 329   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
 330
 331   // These switches are forwarded to both plugin and broker pocesses.
 332   static const char* kCommonForwardSwitches[] = {
 333     switches::kVModule
 334   };
 335   cmd_line->CopySwitchesFrom(browser_command_line, kCommonForwardSwitches,
 336                              arraysize(kCommonForwardSwitches));
 337
 338   if (!is_broker_) {
 339     static const char* kPluginForwardSwitches[] = {
 340       switches::kDisableSeccompFilterSandbox,
 341 #if defined(OS_MACOSX)
 342       switches::kEnableSandboxLogging,
 343 #endif
 344       switches::kNoSandbox,
 345       switches::kPpapiStartupDialog,
 346     };
 347     cmd_line->CopySwitchesFrom(browser_command_line, kPluginForwardSwitches,
 348                                arraysize(kPluginForwardSwitches));
 349
 350     // Copy any flash args over and introduce field trials if necessary.
 351     // TODO(vtl): Stop passing flash args in the command line, or windows is
 352     // going to explode.
 353     std::string field_trial =
 354         base::FieldTrialList::FindFullName(kFlashHwVideoDecodeFieldTrialName);
 355     std::string existing_args =
 356         browser_command_line.GetSwitchValueASCII(switches::kPpapiFlashArgs);
 357     if (field_trial == kFlashHwVideoDecodeFieldTrialEnabledName) {
 358       // Arguments passed to Flash are comma delimited.
 359       if (!existing_args.empty())
 360         existing_args.append(",");
 361       existing_args.append("enable_hw_video_decode=1");
 362 #if defined(OS_MACOSX)
 363       // TODO(ihf): Remove this once Flash newer than 15.0.0.223 is released.
 364       existing_args.append(",enable_hw_video_decode_mac=1");
 365 #endif
 366     }
 367     cmd_line->AppendSwitchASCII(switches::kPpapiFlashArgs, existing_args);
 368   }
 369
 370   std::string locale = GetContentClient()->browser()->GetApplicationLocale();
 371   if (!locale.empty()) {
 372     // Pass on the locale so the plugin will know what language we're using.
 373     cmd_line->AppendSwitchASCII(switches::kLang, locale);
 374   }
 375
 376   if (!plugin_launcher.empty())
 377     cmd_line->PrependWrapper(plugin_launcher);
 378
 379   // On posix, never use the zygote for the broker. Also, only use the zygote if
 380   // the plugin is sandboxed, and we are not using a plugin launcher - having a
 381   // plugin launcher means we need to use another process instead of just
 382   // forking the zygote.
 383 #if defined(OS_POSIX)
 384   if (!info.is_sandboxed)
 385     cmd_line->AppendSwitchASCII(switches::kNoSandbox, std::string());
 386 #endif  // OS_POSIX
 387   process_->Launch(
 388       new PpapiPluginSandboxedProcessLauncherDelegate(is_broker_,
 389                                                       info,
 390                                                       process_->GetHost()),
 391       cmd_line);
 392   return true;
 393 }
 394
 395 void PpapiPluginProcessHost::RequestPluginChannel(Client* client) {
 396   base::ProcessHandle process_handle;
 397   int renderer_child_id;
 398   client->GetPpapiChannelInfo(&process_handle, &renderer_child_id);
 399
 400   base::ProcessId process_id = (process_handle == base::kNullProcessHandle) ?
 401       0 : base::GetProcId(process_handle);
 402
 403   // We can't send any sync messages from the browser because it might lead to
 404   // a hang. See the similar code in PluginProcessHost for more description.
 405   PpapiMsg_CreateChannel* msg = new PpapiMsg_CreateChannel(
 406       process_id, renderer_child_id, client->OffTheRecord());
 407   msg->set_unblock(true);
 408   if (Send(msg)) {
 409     sent_requests_.push(client);
 410   } else {
 411     client->OnPpapiChannelOpened(IPC::ChannelHandle(), base::kNullProcessId, 0);
 412   }
 413 }
 414
 415 void PpapiPluginProcessHost::OnProcessLaunched() {
 416   VLOG(2) << "ppapi plugin process launched.";
 417   host_impl_->set_plugin_process(process_->GetProcess().Duplicate());
 418 }
 419
 420 void PpapiPluginProcessHost::OnProcessCrashed(int exit_code) {
 421   VLOG(1) << "ppapi plugin process crashed.";
 422   PluginServiceImpl::GetInstance()->RegisterPluginCrash(plugin_path_);
 423 }
 424
 425 bool PpapiPluginProcessHost::OnMessageReceived(const IPC::Message& msg) {
 426   bool handled = true;
 427   IPC_BEGIN_MESSAGE_MAP(PpapiPluginProcessHost, msg)
 428     IPC_MESSAGE_HANDLER(PpapiHostMsg_ChannelCreated,
 429                         OnRendererPluginChannelCreated)
 430     IPC_MESSAGE_UNHANDLED(handled = false)
 431   IPC_END_MESSAGE_MAP()
 432   DCHECK(handled);
 433   return handled;
 434 }
 435
 436 // Called when the browser <--> plugin channel has been established.
 437 void PpapiPluginProcessHost::OnChannelConnected(int32 peer_pid) {
 438   // This will actually load the plugin. Errors will actually not be reported
 439   // back at this point. Instead, the plugin will fail to establish the
 440   // connections when we request them on behalf of the renderer(s).
 441   Send(new PpapiMsg_LoadPlugin(plugin_path_, permissions_));
 442
 443   // Process all pending channel requests from the renderers.
 444   for (size_t i = 0; i < pending_requests_.size(); i++)
 445     RequestPluginChannel(pending_requests_[i]);
 446   pending_requests_.clear();
 447 }
 448
 449 // Called when the browser <--> plugin channel has an error. This normally
 450 // means the plugin has crashed.
 451 void PpapiPluginProcessHost::OnChannelError() {
 452   VLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
 453           << "::OnChannelError()";
 454   // We don't need to notify the renderers that were communicating with the
 455   // plugin since they have their own channels which will go into the error
 456   // state at the same time. Instead, we just need to notify any renderers
 457   // that have requested a connection but have not yet received one.
 458   CancelRequests();
 459 }
 460
 461 void PpapiPluginProcessHost::CancelRequests() {
 462   DVLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
 463            << "CancelRequests()";
 464   for (size_t i = 0; i < pending_requests_.size(); i++) {
 465     pending_requests_[i]->OnPpapiChannelOpened(IPC::ChannelHandle(),
 466                                                base::kNullProcessId, 0);
 467   }
 468   pending_requests_.clear();
 469
 470   while (!sent_requests_.empty()) {
 471     sent_requests_.front()->OnPpapiChannelOpened(IPC::ChannelHandle(),
 472                                                  base::kNullProcessId, 0);
 473     sent_requests_.pop();
 474   }
 475 }
 476
 477 // Called when a new plugin <--> renderer channel has been created.
 478 void PpapiPluginProcessHost::OnRendererPluginChannelCreated(
 479     const IPC::ChannelHandle& channel_handle) {
 480   if (sent_requests_.empty())
 481     return;
 482
 483   // All requests should be processed FIFO, so the next item in the
 484   // sent_requests_ queue should be the one that the plugin just created.
 485   Client* client = sent_requests_.front();
 486   sent_requests_.pop();
 487
 488   const ChildProcessData& data = process_->GetData();
 489   client->OnPpapiChannelOpened(channel_handle, base::GetProcId(data.handle),
 490                                data.id);
 491 }
 492
 493 }  // namespace content