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