extensions/browser/extension_function_dispatcher.cc

   1 // Copyright 2014 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 "extensions/browser/extension_function_dispatcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/json/json_string_value_serializer.h"
   9 #include "base/lazy_instance.h"
  10 #include "base/logging.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/metrics/histogram_macros.h"
  13 #include "base/metrics/sparse_histogram.h"
  14 #include "base/process/process.h"
  15 #include "base/profiler/scoped_profile.h"
  16 #include "base/values.h"
  17 #include "build/build_config.h"
  18 #include "content/public/browser/browser_thread.h"
  19 #include "content/public/browser/render_frame_host.h"
  20 #include "content/public/browser/render_process_host.h"
  21 #include "content/public/browser/render_view_host.h"
  22 #include "content/public/browser/user_metrics.h"
  23 #include "content/public/browser/web_contents.h"
  24 #include "content/public/browser/web_contents_observer.h"
  25 #include "content/public/common/result_codes.h"
  26 #include "extensions/browser/api_activity_monitor.h"
  27 #include "extensions/browser/extension_function_registry.h"
  28 #include "extensions/browser/extension_registry.h"
  29 #include "extensions/browser/extension_system.h"
  30 #include "extensions/browser/extensions_browser_client.h"
  31 #include "extensions/browser/io_thread_extension_message_filter.h"
  32 #include "extensions/browser/process_manager.h"
  33 #include "extensions/browser/process_map.h"
  34 #include "extensions/browser/quota_service.h"
  35 #include "extensions/common/extension_api.h"
  36 #include "extensions/common/extension_messages.h"
  37 #include "extensions/common/extension_set.h"
  38 #include "ipc/ipc_message.h"
  39 #include "ipc/ipc_message_macros.h"
  40
  41 using content::BrowserThread;
  42 using content::RenderViewHost;
  43
  44 namespace extensions {
  45 namespace {
  46
  47 // Notifies the ApiActivityMonitor that an extension API function has been
  48 // called. May be called from any thread.
  49 void NotifyApiFunctionCalled(const std::string& extension_id,
  50                              const std::string& api_name,
  51                              scoped_ptr<base::ListValue> args,
  52                              content::BrowserContext* browser_context) {
  53   // The ApiActivityMonitor can only be accessed from the main (UI) thread. If
  54   // we're running on the wrong thread, re-dispatch from the main thread.
  55   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
  56     BrowserThread::PostTask(BrowserThread::UI,
  57                             FROM_HERE,
  58                             base::Bind(&NotifyApiFunctionCalled,
  59                                        extension_id,
  60                                        api_name,
  61                                        base::Passed(&args),
  62                                        browser_context));
  63     return;
  64   }
  65   // The BrowserContext may become invalid after the task above is posted.
  66   if (!ExtensionsBrowserClient::Get()->IsValidContext(browser_context))
  67     return;
  68
  69   ApiActivityMonitor* monitor =
  70       ExtensionsBrowserClient::Get()->GetApiActivityMonitor(browser_context);
  71   if (monitor)
  72     monitor->OnApiFunctionCalled(extension_id, api_name, args.Pass());
  73 }
  74
  75 // Separate copy of ExtensionAPI used for IO thread extension functions. We need
  76 // this because ExtensionAPI has mutable data. It should be possible to remove
  77 // this once all the extension APIs are updated to the feature system.
  78 struct Static {
  79   Static() : api(ExtensionAPI::CreateWithDefaultConfiguration()) {}
  80   scoped_ptr<ExtensionAPI> api;
  81 };
  82 base::LazyInstance<Static> g_global_io_data = LAZY_INSTANCE_INITIALIZER;
  83
  84 // Kills the specified process because it sends us a malformed message.
  85 // Track the specific function's |histogram_value|, as this may indicate a bug
  86 // in that API's implementation on the renderer.
  87 void KillBadMessageSender(const base::Process& process,
  88                           functions::HistogramValue histogram_value) {
  89   NOTREACHED();
  90   content::RecordAction(base::UserMetricsAction("BadMessageTerminate_EFD"));
  91   UMA_HISTOGRAM_ENUMERATION("Extensions.BadMessageFunctionName",
  92                             histogram_value, functions::ENUM_BOUNDARY);
  93   if (process.IsValid())
  94     process.Terminate(content::RESULT_CODE_KILLED_BAD_MESSAGE, false);
  95 }
  96
  97 void CommonResponseCallback(IPC::Sender* ipc_sender,
  98                             int routing_id,
  99                             const base::Process& peer_process,
 100                             int request_id,
 101                             ExtensionFunction::ResponseType type,
 102                             const base::ListValue& results,
 103                             const std::string& error,
 104                             functions::HistogramValue histogram_value) {
 105   DCHECK(ipc_sender);
 106
 107   if (type == ExtensionFunction::BAD_MESSAGE) {
 108     // The renderer has done validation before sending extension api requests.
 109     // Therefore, we should never receive a request that is invalid in a way
 110     // that JSON validation in the renderer should have caught. It could be an
 111     // attacker trying to exploit the browser, so we crash the renderer instead.
 112     LOG(ERROR) <<
 113         "Terminating renderer because of malformed extension message.";
 114     if (content::RenderProcessHost::run_renderer_in_process()) {
 115       // In single process mode it is better if we don't suicide but just crash.
 116       CHECK(false);
 117     } else {
 118       KillBadMessageSender(peer_process, histogram_value);
 119     }
 120     return;
 121   }
 122
 123   ipc_sender->Send(new ExtensionMsg_Response(
 124       routing_id, request_id, type == ExtensionFunction::SUCCEEDED, results,
 125       error));
 126 }
 127
 128 void IOThreadResponseCallback(
 129     const base::WeakPtr<IOThreadExtensionMessageFilter>& ipc_sender,
 130     int routing_id,
 131     int request_id,
 132     ExtensionFunction::ResponseType type,
 133     const base::ListValue& results,
 134     const std::string& error,
 135     functions::HistogramValue histogram_value) {
 136   if (!ipc_sender.get())
 137     return;
 138
 139   base::Process peer_process =
 140       base::Process::DeprecatedGetProcessFromHandle(ipc_sender->PeerHandle());
 141   CommonResponseCallback(ipc_sender.get(), routing_id, peer_process, request_id,
 142                          type, results, error, histogram_value);
 143 }
 144
 145 }  // namespace
 146
 147 class ExtensionFunctionDispatcher::UIThreadResponseCallbackWrapper
 148     : public content::WebContentsObserver {
 149  public:
 150   UIThreadResponseCallbackWrapper(
 151       const base::WeakPtr<ExtensionFunctionDispatcher>& dispatcher,
 152       content::RenderFrameHost* render_frame_host)
 153       : content::WebContentsObserver(
 154             content::WebContents::FromRenderFrameHost(render_frame_host)),
 155         dispatcher_(dispatcher),
 156         render_frame_host_(render_frame_host),
 157         weak_ptr_factory_(this) {
 158   }
 159
 160   ~UIThreadResponseCallbackWrapper() override {}
 161
 162   // content::WebContentsObserver overrides.
 163   void RenderFrameDeleted(
 164       content::RenderFrameHost* render_frame_host) override {
 165     DCHECK_CURRENTLY_ON(BrowserThread::UI);
 166     if (render_frame_host != render_frame_host_)
 167       return;
 168
 169     if (dispatcher_.get()) {
 170       dispatcher_->ui_thread_response_callback_wrappers_
 171           .erase(render_frame_host);
 172     }
 173
 174     delete this;
 175   }
 176
 177   ExtensionFunction::ResponseCallback CreateCallback(int request_id) {
 178     return base::Bind(
 179         &UIThreadResponseCallbackWrapper::OnExtensionFunctionCompleted,
 180         weak_ptr_factory_.GetWeakPtr(),
 181         request_id);
 182   }
 183
 184  private:
 185   void OnExtensionFunctionCompleted(int request_id,
 186                                     ExtensionFunction::ResponseType type,
 187                                     const base::ListValue& results,
 188                                     const std::string& error,
 189                                     functions::HistogramValue histogram_value) {
 190     base::Process process =
 191         content::RenderProcessHost::run_renderer_in_process()
 192             ? base::Process::Current()
 193             : base::Process::DeprecatedGetProcessFromHandle(
 194                   render_frame_host_->GetProcess()->GetHandle());
 195     CommonResponseCallback(render_frame_host_,
 196                            render_frame_host_->GetRoutingID(),
 197                            process, request_id, type, results, error,
 198                            histogram_value);
 199   }
 200
 201   base::WeakPtr<ExtensionFunctionDispatcher> dispatcher_;
 202   content::RenderFrameHost* render_frame_host_;
 203   base::WeakPtrFactory<UIThreadResponseCallbackWrapper> weak_ptr_factory_;
 204
 205   DISALLOW_COPY_AND_ASSIGN(UIThreadResponseCallbackWrapper);
 206 };
 207
 208 WindowController*
 209 ExtensionFunctionDispatcher::Delegate::GetExtensionWindowController() const {
 210   return nullptr;
 211 }
 212
 213 content::WebContents*
 214 ExtensionFunctionDispatcher::Delegate::GetAssociatedWebContents() const {
 215   return nullptr;
 216 }
 217
 218 content::WebContents*
 219 ExtensionFunctionDispatcher::Delegate::GetVisibleWebContents() const {
 220   return GetAssociatedWebContents();
 221 }
 222
 223 bool ExtensionFunctionDispatcher::OverrideFunction(
 224     const std::string& name, ExtensionFunctionFactory factory) {
 225   return ExtensionFunctionRegistry::GetInstance()->OverrideFunction(name,
 226                                                                     factory);
 227 }
 228
 229 // static
 230 void ExtensionFunctionDispatcher::DispatchOnIOThread(
 231     InfoMap* extension_info_map,
 232     void* profile_id,
 233     int render_process_id,
 234     base::WeakPtr<IOThreadExtensionMessageFilter> ipc_sender,
 235     int routing_id,
 236     const ExtensionHostMsg_Request_Params& params) {
 237   const Extension* extension =
 238       extension_info_map->extensions().GetByID(params.extension_id);
 239
 240   ExtensionFunction::ResponseCallback callback(
 241       base::Bind(&IOThreadResponseCallback, ipc_sender, routing_id,
 242                  params.request_id));
 243
 244   scoped_refptr<ExtensionFunction> function(
 245       CreateExtensionFunction(params,
 246                               extension,
 247                               render_process_id,
 248                               extension_info_map->process_map(),
 249                               g_global_io_data.Get().api.get(),
 250                               profile_id,
 251                               callback));
 252   if (!function.get())
 253     return;
 254
 255   IOThreadExtensionFunction* function_io =
 256       function->AsIOThreadExtensionFunction();
 257   if (!function_io) {
 258     NOTREACHED();
 259     return;
 260   }
 261   function_io->set_ipc_sender(ipc_sender, routing_id);
 262   function_io->set_extension_info_map(extension_info_map);
 263   if (extension) {
 264     function->set_include_incognito(
 265         extension_info_map->IsIncognitoEnabled(extension->id()));
 266   }
 267
 268   if (!CheckPermissions(function.get(), params, callback))
 269     return;
 270
 271   if (!extension) {
 272     // Skip all of the UMA, quota, event page, activity logging stuff if there
 273     // isn't an extension, e.g. if the function call was from WebUI.
 274     function->Run()->Execute();
 275     return;
 276   }
 277
 278   QuotaService* quota = extension_info_map->GetQuotaService();
 279   std::string violation_error = quota->Assess(extension->id(),
 280                                               function.get(),
 281                                               &params.arguments,
 282                                               base::TimeTicks::Now());
 283   if (violation_error.empty()) {
 284     scoped_ptr<base::ListValue> args(params.arguments.DeepCopy());
 285     NotifyApiFunctionCalled(extension->id(),
 286                             params.name,
 287                             args.Pass(),
 288                             static_cast<content::BrowserContext*>(profile_id));
 289     UMA_HISTOGRAM_SPARSE_SLOWLY("Extensions.FunctionCalls",
 290                                 function->histogram_value());
 291     tracked_objects::ScopedProfile scoped_profile(
 292         FROM_HERE_WITH_EXPLICIT_FUNCTION(function->name()),
 293         tracked_objects::ScopedProfile::ENABLED);
 294     function->Run()->Execute();
 295   } else {
 296     function->OnQuotaExceeded(violation_error);
 297   }
 298 }
 299
 300 ExtensionFunctionDispatcher::ExtensionFunctionDispatcher(
 301     content::BrowserContext* browser_context)
 302     : browser_context_(browser_context) {
 303 }
 304
 305 ExtensionFunctionDispatcher::~ExtensionFunctionDispatcher() {
 306 }
 307
 308 void ExtensionFunctionDispatcher::Dispatch(
 309     const ExtensionHostMsg_Request_Params& params,
 310     content::RenderFrameHost* render_frame_host) {
 311   UIThreadResponseCallbackWrapperMap::const_iterator
 312       iter = ui_thread_response_callback_wrappers_.find(render_frame_host);
 313   UIThreadResponseCallbackWrapper* callback_wrapper = nullptr;
 314   if (iter == ui_thread_response_callback_wrappers_.end()) {
 315     callback_wrapper = new UIThreadResponseCallbackWrapper(AsWeakPtr(),
 316                                                            render_frame_host);
 317     ui_thread_response_callback_wrappers_[render_frame_host] = callback_wrapper;
 318   } else {
 319     callback_wrapper = iter->second;
 320   }
 321
 322   DispatchWithCallbackInternal(
 323       params, render_frame_host,
 324       callback_wrapper->CreateCallback(params.request_id));
 325 }
 326
 327 void ExtensionFunctionDispatcher::DispatchWithCallbackInternal(
 328     const ExtensionHostMsg_Request_Params& params,
 329     content::RenderFrameHost* render_frame_host,
 330     const ExtensionFunction::ResponseCallback& callback) {
 331   DCHECK(render_frame_host);
 332   // TODO(yzshen): There is some shared logic between this method and
 333   // DispatchOnIOThread(). It is nice to deduplicate.
 334   ProcessMap* process_map = ProcessMap::Get(browser_context_);
 335   if (!process_map)
 336     return;
 337
 338   ExtensionRegistry* registry = ExtensionRegistry::Get(browser_context_);
 339   const Extension* extension =
 340       registry->enabled_extensions().GetByID(params.extension_id);
 341   if (!extension) {
 342     extension =
 343         registry->enabled_extensions().GetHostedAppByURL(params.source_url);
 344   }
 345
 346   int process_id = render_frame_host->GetProcess()->GetID();
 347   scoped_refptr<ExtensionFunction> function(
 348       CreateExtensionFunction(params,
 349                               extension,
 350                               process_id,
 351                               *process_map,
 352                               ExtensionAPI::GetSharedInstance(),
 353                               browser_context_,
 354                               callback));
 355   if (!function.get())
 356     return;
 357
 358   UIThreadExtensionFunction* function_ui =
 359       function->AsUIThreadExtensionFunction();
 360   if (!function_ui) {
 361     NOTREACHED();
 362     return;
 363   }
 364   function_ui->SetRenderFrameHost(render_frame_host);
 365   function_ui->set_dispatcher(AsWeakPtr());
 366   function_ui->set_browser_context(browser_context_);
 367   if (extension &&
 368       ExtensionsBrowserClient::Get()->CanExtensionCrossIncognito(
 369           extension, browser_context_)) {
 370     function->set_include_incognito(true);
 371   }
 372
 373   if (!CheckPermissions(function.get(), params, callback))
 374     return;
 375
 376   if (!extension) {
 377     // Skip all of the UMA, quota, event page, activity logging stuff if there
 378     // isn't an extension, e.g. if the function call was from WebUI.
 379     function->Run()->Execute();
 380     return;
 381   }
 382
 383   // Fetch the ProcessManager before |this| is possibly invalidated.
 384   ProcessManager* process_manager = ProcessManager::Get(browser_context_);
 385
 386   ExtensionSystem* extension_system = ExtensionSystem::Get(browser_context_);
 387   QuotaService* quota = extension_system->quota_service();
 388   std::string violation_error = quota->Assess(extension->id(),
 389                                               function.get(),
 390                                               &params.arguments,
 391                                               base::TimeTicks::Now());
 392
 393   if (violation_error.empty()) {
 394     scoped_ptr<base::ListValue> args(params.arguments.DeepCopy());
 395
 396     // See crbug.com/39178.
 397     ExtensionsBrowserClient::Get()->PermitExternalProtocolHandler();
 398     NotifyApiFunctionCalled(
 399         extension->id(), params.name, args.Pass(), browser_context_);
 400     UMA_HISTOGRAM_SPARSE_SLOWLY("Extensions.FunctionCalls",
 401                                 function->histogram_value());
 402     tracked_objects::ScopedProfile scoped_profile(
 403         FROM_HERE_WITH_EXPLICIT_FUNCTION(function->name()),
 404         tracked_objects::ScopedProfile::ENABLED);
 405     function->Run()->Execute();
 406   } else {
 407     function->OnQuotaExceeded(violation_error);
 408   }
 409
 410   // Note: do not access |this| after this point. We may have been deleted
 411   // if function->Run() ended up closing the tab that owns us.
 412
 413   // Check if extension was uninstalled by management.uninstall.
 414   if (!registry->enabled_extensions().GetByID(params.extension_id))
 415     return;
 416
 417   // We only adjust the keepalive count for UIThreadExtensionFunction for
 418   // now, largely for simplicity's sake. This is OK because currently, only
 419   // the webRequest API uses IOThreadExtensionFunction, and that API is not
 420   // compatible with lazy background pages.
 421   process_manager->IncrementLazyKeepaliveCount(extension);
 422 }
 423
 424 void ExtensionFunctionDispatcher::OnExtensionFunctionCompleted(
 425     const Extension* extension) {
 426   if (extension) {
 427     ProcessManager::Get(browser_context_)
 428         ->DecrementLazyKeepaliveCount(extension);
 429   }
 430 }
 431
 432 WindowController*
 433 ExtensionFunctionDispatcher::GetExtensionWindowController() const {
 434   return delegate_ ? delegate_->GetExtensionWindowController() : nullptr;
 435 }
 436
 437 content::WebContents*
 438 ExtensionFunctionDispatcher::GetAssociatedWebContents() const {
 439   return delegate_ ? delegate_->GetAssociatedWebContents() : nullptr;
 440 }
 441
 442 content::WebContents*
 443 ExtensionFunctionDispatcher::GetVisibleWebContents() const {
 444   return delegate_ ? delegate_->GetVisibleWebContents() :
 445       GetAssociatedWebContents();
 446 }
 447
 448 // static
 449 bool ExtensionFunctionDispatcher::CheckPermissions(
 450     ExtensionFunction* function,
 451     const ExtensionHostMsg_Request_Params& params,
 452     const ExtensionFunction::ResponseCallback& callback) {
 453   if (!function->HasPermission()) {
 454     LOG(ERROR) << "Permission denied for " << params.name;
 455     SendAccessDenied(callback, function->histogram_value());
 456     return false;
 457   }
 458   return true;
 459 }
 460
 461 // static
 462 ExtensionFunction* ExtensionFunctionDispatcher::CreateExtensionFunction(
 463     const ExtensionHostMsg_Request_Params& params,
 464     const Extension* extension,
 465     int requesting_process_id,
 466     const ProcessMap& process_map,
 467     ExtensionAPI* api,
 468     void* profile_id,
 469     const ExtensionFunction::ResponseCallback& callback) {
 470   ExtensionFunction* function =
 471       ExtensionFunctionRegistry::GetInstance()->NewFunction(params.name);
 472   if (!function) {
 473     LOG(ERROR) << "Unknown Extension API - " << params.name;
 474     SendAccessDenied(callback, function->histogram_value());
 475     return NULL;
 476   }
 477
 478   function->SetArgs(&params.arguments);
 479   function->set_source_url(params.source_url);
 480   function->set_request_id(params.request_id);
 481   function->set_has_callback(params.has_callback);
 482   function->set_user_gesture(params.user_gesture);
 483   function->set_extension(extension);
 484   function->set_profile_id(profile_id);
 485   function->set_response_callback(callback);
 486   function->set_source_tab_id(params.source_tab_id);
 487   function->set_source_context_type(
 488       process_map.GetMostLikelyContextType(extension, requesting_process_id));
 489   function->set_source_process_id(requesting_process_id);
 490
 491   return function;
 492 }
 493
 494 // static
 495 void ExtensionFunctionDispatcher::SendAccessDenied(
 496     const ExtensionFunction::ResponseCallback& callback,
 497     functions::HistogramValue histogram_value) {
 498   base::ListValue empty_list;
 499   callback.Run(ExtensionFunction::FAILED, empty_list,
 500                "Access to extension API denied.", histogram_value);
 501 }
 502
 503 }  // namespace extensions