content/browser/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/plugin_process_host.h"
   6
   7 #if defined(OS_WIN)
   8 #include <windows.h>
   9 #elif defined(OS_POSIX)
  10 #include <utility>  // for pair<>
  11 #endif
  12
  13 #include <vector>
  14
  15 #include "base/base_switches.h"
  16 #include "base/bind.h"
  17 #include "base/command_line.h"
  18 #include "base/files/file_path.h"
  19 #include "base/lazy_instance.h"
  20 #include "base/logging.h"
  21 #include "base/metrics/histogram.h"
  22 #include "base/strings/string_number_conversions.h"
  23 #include "base/strings/string_util.h"
  24 #include "base/strings/utf_string_conversions.h"
  25 #include "base/synchronization/lock.h"
  26 #include "content/browser/browser_child_process_host_impl.h"
  27 #include "content/browser/gpu/gpu_data_manager_impl.h"
  28 #include "content/browser/loader/resource_message_filter.h"
  29 #include "content/browser/plugin_service_impl.h"
  30 #include "content/common/child_process_host_impl.h"
  31 #include "content/common/plugin_process_messages.h"
  32 #include "content/common/resource_messages.h"
  33 #include "content/public/browser/browser_thread.h"
  34 #include "content/public/browser/content_browser_client.h"
  35 #include "content/public/browser/notification_types.h"
  36 #include "content/public/browser/plugin_service.h"
  37 #include "content/public/browser/resource_context.h"
  38 #include "content/public/common/content_switches.h"
  39 #include "content/public/common/process_type.h"
  40 #include "content/public/common/sandboxed_process_launcher_delegate.h"
  41 #include "ipc/ipc_switches.h"
  42 #include "net/url_request/url_request_context_getter.h"
  43 #include "ui/base/ui_base_switches.h"
  44 #include "ui/gfx/native_widget_types.h"
  45 #include "ui/gfx/switches.h"
  46 #include "ui/gl/gl_switches.h"
  47
  48 #if defined(OS_MACOSX)
  49 #include "base/mac/mac_util.h"
  50 #include "ui/gfx/geometry/rect.h"
  51 #endif
  52
  53 #if defined(OS_WIN)
  54 #include "base/win/windows_version.h"
  55 #include "content/common/plugin_constants_win.h"
  56 #endif
  57
  58 namespace content {
  59
  60 namespace {
  61
  62 base::LazyInstance<std::map<base::ProcessId, WebPluginInfo> >
  63     g_process_webplugin_info = LAZY_INSTANCE_INITIALIZER;
  64 base::LazyInstance<base::Lock>::Leaky
  65     g_process_webplugin_info_lock = LAZY_INSTANCE_INITIALIZER;
  66 }
  67
  68 bool PluginProcessHost::GetWebPluginInfoFromPluginPid(base::ProcessId pid,
  69                                                       WebPluginInfo* info) {
  70   base::AutoLock lock(g_process_webplugin_info_lock.Get());
  71   if (!g_process_webplugin_info.Get().count(pid))
  72     return false;
  73
  74   *info = g_process_webplugin_info.Get()[pid];
  75   return true;
  76 }
  77
  78 #if defined(OS_WIN)
  79 void PluginProcessHost::OnPluginWindowDestroyed(HWND window, HWND parent) {
  80   // The window is destroyed at this point, we just care about its parent, which
  81   // is the intermediate window we created.
  82   std::set<HWND>::iterator window_index =
  83       plugin_parent_windows_set_.find(parent);
  84   if (window_index == plugin_parent_windows_set_.end())
  85     return;
  86
  87   plugin_parent_windows_set_.erase(window_index);
  88   PostMessage(parent, WM_CLOSE, 0, 0);
  89 }
  90
  91 void PluginProcessHost::AddWindow(HWND window) {
  92   plugin_parent_windows_set_.insert(window);
  93 }
  94 #endif  // defined(OS_WIN)
  95
  96 // NOTE: changes to this class need to be reviewed by the security team.
  97 class PluginSandboxedProcessLauncherDelegate
  98     : public SandboxedProcessLauncherDelegate {
  99  public:
 100   explicit PluginSandboxedProcessLauncherDelegate(ChildProcessHost* host)
 101 #if defined(OS_POSIX)
 102       : ipc_fd_(host->TakeClientFileDescriptor())
 103 #endif  // OS_POSIX
 104   {}
 105
 106   ~PluginSandboxedProcessLauncherDelegate() override {}
 107
 108 #if defined(OS_WIN)
 109   bool ShouldSandbox() override {
 110     return false;
 111   }
 112
 113 #elif defined(OS_POSIX)
 114   base::ScopedFD TakeIpcFd() override { return ipc_fd_.Pass(); }
 115 #endif  // OS_WIN
 116
 117  private:
 118 #if defined(OS_POSIX)
 119   base::ScopedFD ipc_fd_;
 120 #endif  // OS_POSIX
 121
 122   DISALLOW_COPY_AND_ASSIGN(PluginSandboxedProcessLauncherDelegate);
 123 };
 124
 125 PluginProcessHost::PluginProcessHost()
 126     : pid_(base::kNullProcessId)
 127 #if defined(OS_MACOSX)
 128     , plugin_cursor_visible_(true)
 129 #endif
 130 {
 131   process_.reset(new BrowserChildProcessHostImpl(PROCESS_TYPE_PLUGIN, this));
 132 }
 133
 134 PluginProcessHost::~PluginProcessHost() {
 135 #if defined(OS_WIN)
 136   // We erase HWNDs from the plugin_parent_windows_set_ when we receive a
 137   // notification that the window is being destroyed. If we don't receive this
 138   // notification and the PluginProcessHost instance is being destroyed, it
 139   // means that the plugin process crashed. We paint a sad face in this case in
 140   // the renderer process. To ensure that the sad face shows up, and we don't
 141   // leak HWNDs, we should destroy existing plugin parent windows.
 142   std::set<HWND>::iterator window_index;
 143   for (window_index = plugin_parent_windows_set_.begin();
 144        window_index != plugin_parent_windows_set_.end();
 145        ++window_index) {
 146     PostMessage(*window_index, WM_CLOSE, 0, 0);
 147   }
 148 #elif defined(OS_MACOSX)
 149   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 150   // If the plugin process crashed but had fullscreen windows open at the time,
 151   // make sure that the menu bar is visible.
 152   for (size_t i = 0; i < plugin_fullscreen_windows_set_.size(); ++i) {
 153     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 154                             base::Bind(base::mac::ReleaseFullScreen,
 155                                        base::mac::kFullScreenModeHideAll));
 156   }
 157   // If the plugin hid the cursor, reset that.
 158   if (!plugin_cursor_visible_) {
 159     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 160                             base::Bind(base::mac::SetCursorVisibility, true));
 161   }
 162 #endif
 163   // Cancel all pending and sent requests.
 164   CancelRequests();
 165
 166   {
 167     base::AutoLock lock(g_process_webplugin_info_lock.Get());
 168     g_process_webplugin_info.Get()[pid_] = info_;
 169   }
 170 }
 171
 172 bool PluginProcessHost::Send(IPC::Message* message) {
 173   return process_->Send(message);
 174 }
 175
 176 bool PluginProcessHost::Init(const WebPluginInfo& info) {
 177   info_ = info;
 178   process_->SetName(info_.name);
 179
 180   std::string channel_id = process_->GetHost()->CreateChannel();
 181   if (channel_id.empty())
 182     return false;
 183
 184   // Build command line for plugin. When we have a plugin launcher, we can't
 185   // allow "self" on linux and we need the real file path.
 186   const base::CommandLine& browser_command_line =
 187       *base::CommandLine::ForCurrentProcess();
 188   base::CommandLine::StringType plugin_launcher =
 189       browser_command_line.GetSwitchValueNative(switches::kPluginLauncher);
 190
 191 #if defined(OS_MACOSX)
 192   // Run the plugin process in a mode tolerant of heap execution without
 193   // explicit mprotect calls. Some plugins still rely on this quaint and
 194   // archaic "feature." See http://crbug.com/93551.
 195   int flags = ChildProcessHost::CHILD_ALLOW_HEAP_EXECUTION;
 196 #elif defined(OS_LINUX)
 197   int flags = plugin_launcher.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
 198                                         ChildProcessHost::CHILD_NORMAL;
 199 #else
 200   int flags = ChildProcessHost::CHILD_NORMAL;
 201 #endif
 202
 203   base::FilePath exe_path = ChildProcessHost::GetChildPath(flags);
 204   if (exe_path.empty())
 205     return false;
 206
 207   base::CommandLine* cmd_line = new base::CommandLine(exe_path);
 208   // Put the process type and plugin path first so they're easier to see
 209   // in process listings using native process management tools.
 210   cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kPluginProcess);
 211   cmd_line->AppendSwitchPath(switches::kPluginPath, info.path);
 212
 213   // Propagate the following switches to the plugin command line (along with
 214   // any associated values) if present in the browser command line
 215   static const char* const kSwitchNames[] = {
 216     switches::kDisableBreakpad,
 217     switches::kDisableDirectNPAPIRequests,
 218     switches::kEnableStatsTable,
 219     switches::kFullMemoryCrashReport,
 220     switches::kLoggingLevel,
 221     switches::kLogPluginMessages,
 222     switches::kNoSandbox,
 223     switches::kPluginStartupDialog,
 224     switches::kTraceStartup,
 225     switches::kUseGL,
 226     switches::kForceDeviceScaleFactor,
 227 #if defined(OS_MACOSX)
 228     switches::kDisableCoreAnimationPlugins,
 229     switches::kEnableSandboxLogging,
 230 #endif
 231   };
 232
 233   cmd_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
 234                              arraysize(kSwitchNames));
 235
 236   GpuDataManagerImpl::GetInstance()->AppendPluginCommandLine(cmd_line);
 237
 238   // If specified, prepend a launcher program to the command line.
 239   if (!plugin_launcher.empty())
 240     cmd_line->PrependWrapper(plugin_launcher);
 241
 242   std::string locale = GetContentClient()->browser()->GetApplicationLocale();
 243   if (!locale.empty()) {
 244     // Pass on the locale so the null plugin will use the right language in the
 245     // prompt to install the desired plugin.
 246     cmd_line->AppendSwitchASCII(switches::kLang, locale);
 247   }
 248
 249   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
 250
 251   // The plugin needs to be shutdown gracefully, i.e. NP_Shutdown needs to be
 252   // called on the plugin. The plugin process exits when it receives the
 253   // OnChannelError notification indicating that the browser plugin channel has
 254   // been destroyed.
 255   bool terminate_on_shutdown = false;
 256   process_->Launch(
 257       new PluginSandboxedProcessLauncherDelegate(process_->GetHost()),
 258       cmd_line,
 259       terminate_on_shutdown);
 260
 261   ResourceMessageFilter::GetContextsCallback get_contexts_callback(
 262       base::Bind(&PluginProcessHost::GetContexts,
 263       base::Unretained(this)));
 264
 265   // TODO(jam): right now we're passing NULL for appcache, blob storage, file
 266   // system and host zoom level context. If NPAPI plugins actually use this,
 267   // we'll have to plumb them.
 268   ResourceMessageFilter* resource_message_filter = new ResourceMessageFilter(
 269       process_->GetData().id, PROCESS_TYPE_PLUGIN, NULL, NULL, NULL, NULL, NULL,
 270       get_contexts_callback);
 271   process_->AddFilter(resource_message_filter);
 272   return true;
 273 }
 274
 275 void PluginProcessHost::ForceShutdown() {
 276   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 277   Send(new PluginProcessMsg_NotifyRenderersOfPendingShutdown());
 278   process_->ForceShutdown();
 279 }
 280
 281 bool PluginProcessHost::OnMessageReceived(const IPC::Message& msg) {
 282   bool handled = true;
 283   IPC_BEGIN_MESSAGE_MAP(PluginProcessHost, msg)
 284     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_ChannelCreated, OnChannelCreated)
 285     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_ChannelDestroyed,
 286                         OnChannelDestroyed)
 287 #if defined(OS_WIN)
 288     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_PluginWindowDestroyed,
 289                         OnPluginWindowDestroyed)
 290 #endif
 291 #if defined(OS_MACOSX)
 292     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_PluginShowWindow,
 293                         OnPluginShowWindow)
 294     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_PluginHideWindow,
 295                         OnPluginHideWindow)
 296     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_PluginSetCursorVisibility,
 297                         OnPluginSetCursorVisibility)
 298 #endif
 299     IPC_MESSAGE_UNHANDLED(handled = false)
 300   IPC_END_MESSAGE_MAP()
 301
 302   return handled;
 303 }
 304
 305 void PluginProcessHost::OnChannelConnected(int32 peer_pid) {
 306   for (size_t i = 0; i < pending_requests_.size(); ++i) {
 307     RequestPluginChannel(pending_requests_[i]);
 308   }
 309
 310   pending_requests_.clear();
 311
 312   pid_ = peer_pid;
 313   {
 314     base::AutoLock lock(g_process_webplugin_info_lock.Get());
 315     g_process_webplugin_info.Get()[pid_] = info_;
 316   }
 317 }
 318
 319 void PluginProcessHost::OnChannelError() {
 320   CancelRequests();
 321 }
 322
 323 bool PluginProcessHost::CanShutdown() {
 324   return sent_requests_.empty();
 325 }
 326
 327 void PluginProcessHost::OnProcessCrashed(int exit_code) {
 328   PluginServiceImpl::GetInstance()->RegisterPluginCrash(info_.path);
 329 }
 330
 331 void PluginProcessHost::CancelRequests() {
 332   for (size_t i = 0; i < pending_requests_.size(); ++i)
 333     pending_requests_[i]->OnError();
 334   pending_requests_.clear();
 335
 336   while (!sent_requests_.empty()) {
 337     Client* client = sent_requests_.front();
 338     if (client)
 339       client->OnError();
 340     sent_requests_.pop_front();
 341   }
 342 }
 343
 344 void PluginProcessHost::OpenChannelToPlugin(Client* client) {
 345   BrowserThread::PostTask(
 346       BrowserThread::UI, FROM_HERE,
 347       base::Bind(&BrowserChildProcessHostImpl::NotifyProcessInstanceCreated,
 348                  process_->GetData()));
 349   client->SetPluginInfo(info_);
 350   if (process_->GetHost()->IsChannelOpening()) {
 351     // The channel is already in the process of being opened.  Put
 352     // this "open channel" request into a queue of requests that will
 353     // be run once the channel is open.
 354     pending_requests_.push_back(client);
 355     return;
 356   }
 357
 358   // We already have an open channel, send a request right away to plugin.
 359   RequestPluginChannel(client);
 360 }
 361
 362 void PluginProcessHost::CancelPendingRequest(Client* client) {
 363   std::vector<Client*>::iterator it = pending_requests_.begin();
 364   while (it != pending_requests_.end()) {
 365     if (client == *it) {
 366       pending_requests_.erase(it);
 367       return;
 368     }
 369     ++it;
 370   }
 371   DCHECK(it != pending_requests_.end());
 372 }
 373
 374 void PluginProcessHost::CancelSentRequest(Client* client) {
 375   std::list<Client*>::iterator it = sent_requests_.begin();
 376   while (it != sent_requests_.end()) {
 377     if (client == *it) {
 378       *it = NULL;
 379       return;
 380     }
 381     ++it;
 382   }
 383   DCHECK(it != sent_requests_.end());
 384 }
 385
 386 void PluginProcessHost::RequestPluginChannel(Client* client) {
 387   // We can't send any sync messages from the browser because it might lead to
 388   // a hang.  However this async messages must be answered right away by the
 389   // plugin process (i.e. unblocks a Send() call like a sync message) otherwise
 390   // a deadlock can occur if the plugin creation request from the renderer is
 391   // a result of a sync message by the plugin process.
 392   PluginProcessMsg_CreateChannel* msg =
 393       new PluginProcessMsg_CreateChannel(
 394           client->ID(),
 395           client->OffTheRecord());
 396   msg->set_unblock(true);
 397   if (Send(msg)) {
 398     sent_requests_.push_back(client);
 399     client->OnSentPluginChannelRequest();
 400   } else {
 401     client->OnError();
 402   }
 403 }
 404
 405 void PluginProcessHost::OnChannelCreated(
 406     const IPC::ChannelHandle& channel_handle) {
 407   Client* client = sent_requests_.front();
 408
 409   if (client) {
 410     if (!resource_context_map_.count(client->ID())) {
 411       ResourceContextEntry entry;
 412       entry.ref_count = 0;
 413       entry.resource_context = client->GetResourceContext();
 414       resource_context_map_[client->ID()] = entry;
 415     }
 416     resource_context_map_[client->ID()].ref_count++;
 417     client->OnChannelOpened(channel_handle);
 418   }
 419   sent_requests_.pop_front();
 420 }
 421
 422 void PluginProcessHost::OnChannelDestroyed(int renderer_id) {
 423   resource_context_map_[renderer_id].ref_count--;
 424   if (!resource_context_map_[renderer_id].ref_count)
 425     resource_context_map_.erase(renderer_id);
 426 }
 427
 428 void PluginProcessHost::GetContexts(const ResourceHostMsg_Request& request,
 429                                     ResourceContext** resource_context,
 430                                     net::URLRequestContext** request_context) {
 431   *resource_context =
 432       resource_context_map_[request.origin_pid].resource_context;
 433   *request_context = (*resource_context)->GetRequestContext();
 434 }
 435
 436 }  // namespace content