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       RenderViewHost* render_view_host)
 153       : content::WebContentsObserver(
 154             content::WebContents::FromRenderViewHost(render_view_host)),
 155         dispatcher_(dispatcher),
 156         render_view_host_(render_view_host),
 157         weak_ptr_factory_(this) {
 158   }
 159
 160   ~UIThreadResponseCallbackWrapper() override {}
 161
 162   // content::WebContentsObserver overrides.
 163   void RenderViewDeleted(RenderViewHost* render_view_host) override {
 164     DCHECK_CURRENTLY_ON(BrowserThread::UI);
 165     if (render_view_host != render_view_host_)
 166       return;
 167
 168     if (dispatcher_.get()) {
 169       dispatcher_->ui_thread_response_callback_wrappers_
 170           .erase(render_view_host);
 171     }
 172
 173     delete this;
 174   }
 175
 176   ExtensionFunction::ResponseCallback CreateCallback(int request_id) {
 177     return base::Bind(
 178         &UIThreadResponseCallbackWrapper::OnExtensionFunctionCompleted,
 179         weak_ptr_factory_.GetWeakPtr(),
 180         request_id);
 181   }
 182
 183  private:
 184   void OnExtensionFunctionCompleted(int request_id,
 185                                     ExtensionFunction::ResponseType type,
 186                                     const base::ListValue& results,
 187                                     const std::string& error,
 188                                     functions::HistogramValue histogram_value) {
 189     base::Process process = base::Process::DeprecatedGetProcessFromHandle(
 190         render_view_host_->GetProcess()->GetHandle());
 191     CommonResponseCallback(render_view_host_, render_view_host_->GetRoutingID(),
 192                            process, request_id, type, results, error,
 193                            histogram_value);
 194   }
 195
 196   base::WeakPtr<ExtensionFunctionDispatcher> dispatcher_;
 197   content::RenderViewHost* render_view_host_;
 198   base::WeakPtrFactory<UIThreadResponseCallbackWrapper> weak_ptr_factory_;
 199
 200   DISALLOW_COPY_AND_ASSIGN(UIThreadResponseCallbackWrapper);
 201 };
 202
 203 WindowController*
 204 ExtensionFunctionDispatcher::Delegate::GetExtensionWindowController() const {
 205   return NULL;
 206 }
 207
 208 content::WebContents*
 209 ExtensionFunctionDispatcher::Delegate::GetAssociatedWebContents() const {
 210   return NULL;
 211 }
 212
 213 content::WebContents*
 214 ExtensionFunctionDispatcher::Delegate::GetVisibleWebContents() const {
 215   return GetAssociatedWebContents();
 216 }
 217
 218 void ExtensionFunctionDispatcher::GetAllFunctionNames(
 219     std::vector<std::string>* names) {
 220   ExtensionFunctionRegistry::GetInstance()->GetAllNames(names);
 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     Delegate* delegate)
 303     : browser_context_(browser_context),
 304       delegate_(delegate) {
 305 }
 306
 307 ExtensionFunctionDispatcher::~ExtensionFunctionDispatcher() {
 308 }
 309
 310 void ExtensionFunctionDispatcher::Dispatch(
 311     const ExtensionHostMsg_Request_Params& params,
 312     RenderViewHost* render_view_host) {
 313   UIThreadResponseCallbackWrapperMap::const_iterator
 314       iter = ui_thread_response_callback_wrappers_.find(render_view_host);
 315   UIThreadResponseCallbackWrapper* callback_wrapper = NULL;
 316   if (iter == ui_thread_response_callback_wrappers_.end()) {
 317     callback_wrapper = new UIThreadResponseCallbackWrapper(AsWeakPtr(),
 318                                                            render_view_host);
 319     ui_thread_response_callback_wrappers_[render_view_host] = callback_wrapper;
 320   } else {
 321     callback_wrapper = iter->second;
 322   }
 323
 324   DispatchWithCallbackInternal(
 325       params, render_view_host, NULL,
 326       callback_wrapper->CreateCallback(params.request_id));
 327 }
 328
 329 void ExtensionFunctionDispatcher::DispatchWithCallbackInternal(
 330     const ExtensionHostMsg_Request_Params& params,
 331     RenderViewHost* render_view_host,
 332     content::RenderFrameHost* render_frame_host,
 333     const ExtensionFunction::ResponseCallback& callback) {
 334   DCHECK(render_view_host || render_frame_host);
 335   // TODO(yzshen): There is some shared logic between this method and
 336   // DispatchOnIOThread(). It is nice to deduplicate.
 337   ProcessMap* process_map = ProcessMap::Get(browser_context_);
 338   if (!process_map)
 339     return;
 340
 341   ExtensionRegistry* registry = ExtensionRegistry::Get(browser_context_);
 342   const Extension* extension =
 343       registry->enabled_extensions().GetByID(params.extension_id);
 344   if (!extension) {
 345     extension =
 346         registry->enabled_extensions().GetHostedAppByURL(params.source_url);
 347   }
 348
 349   int process_id = render_view_host ? render_view_host->GetProcess()->GetID() :
 350                                       render_frame_host->GetProcess()->GetID();
 351   scoped_refptr<ExtensionFunction> function(
 352       CreateExtensionFunction(params,
 353                               extension,
 354                               process_id,
 355                               *process_map,
 356                               ExtensionAPI::GetSharedInstance(),
 357                               browser_context_,
 358                               callback));
 359   if (!function.get())
 360     return;
 361
 362   UIThreadExtensionFunction* function_ui =
 363       function->AsUIThreadExtensionFunction();
 364   if (!function_ui) {
 365     NOTREACHED();
 366     return;
 367   }
 368   if (render_view_host) {
 369     function_ui->SetRenderViewHost(render_view_host);
 370   } else {
 371     function_ui->SetRenderFrameHost(render_frame_host);
 372   }
 373   function_ui->set_dispatcher(AsWeakPtr());
 374   function_ui->set_browser_context(browser_context_);
 375   if (extension &&
 376       ExtensionsBrowserClient::Get()->CanExtensionCrossIncognito(
 377           extension, browser_context_)) {
 378     function->set_include_incognito(true);
 379   }
 380
 381   if (!CheckPermissions(function.get(), params, callback))
 382     return;
 383
 384   if (!extension) {
 385     // Skip all of the UMA, quota, event page, activity logging stuff if there
 386     // isn't an extension, e.g. if the function call was from WebUI.
 387     function->Run()->Execute();
 388     return;
 389   }
 390
 391   // Fetch the ProcessManager before |this| is possibly invalidated.
 392   ProcessManager* process_manager = ProcessManager::Get(browser_context_);
 393
 394   ExtensionSystem* extension_system = ExtensionSystem::Get(browser_context_);
 395   QuotaService* quota = extension_system->quota_service();
 396   std::string violation_error = quota->Assess(extension->id(),
 397                                               function.get(),
 398                                               &params.arguments,
 399                                               base::TimeTicks::Now());
 400
 401   if (violation_error.empty()) {
 402     scoped_ptr<base::ListValue> args(params.arguments.DeepCopy());
 403
 404     // See crbug.com/39178.
 405     ExtensionsBrowserClient::Get()->PermitExternalProtocolHandler();
 406     NotifyApiFunctionCalled(
 407         extension->id(), params.name, args.Pass(), browser_context_);
 408     UMA_HISTOGRAM_SPARSE_SLOWLY("Extensions.FunctionCalls",
 409                                 function->histogram_value());
 410     tracked_objects::ScopedProfile scoped_profile(
 411         FROM_HERE_WITH_EXPLICIT_FUNCTION(function->name()),
 412         tracked_objects::ScopedProfile::ENABLED);
 413     function->Run()->Execute();
 414   } else {
 415     function->OnQuotaExceeded(violation_error);
 416   }
 417
 418   // Note: do not access |this| after this point. We may have been deleted
 419   // if function->Run() ended up closing the tab that owns us.
 420
 421   // Check if extension was uninstalled by management.uninstall.
 422   if (!registry->enabled_extensions().GetByID(params.extension_id))
 423     return;
 424
 425   // We only adjust the keepalive count for UIThreadExtensionFunction for
 426   // now, largely for simplicity's sake. This is OK because currently, only
 427   // the webRequest API uses IOThreadExtensionFunction, and that API is not
 428   // compatible with lazy background pages.
 429   process_manager->IncrementLazyKeepaliveCount(extension);
 430 }
 431
 432 void ExtensionFunctionDispatcher::OnExtensionFunctionCompleted(
 433     const Extension* extension) {
 434   if (extension) {
 435     ProcessManager::Get(browser_context_)
 436         ->DecrementLazyKeepaliveCount(extension);
 437   }
 438 }
 439
 440 // static
 441 bool ExtensionFunctionDispatcher::CheckPermissions(
 442     ExtensionFunction* function,
 443     const ExtensionHostMsg_Request_Params& params,
 444     const ExtensionFunction::ResponseCallback& callback) {
 445   if (!function->HasPermission()) {
 446     LOG(ERROR) << "Permission denied for " << params.name;
 447     SendAccessDenied(callback, function->histogram_value());
 448     return false;
 449   }
 450   return true;
 451 }
 452
 453 // static
 454 ExtensionFunction* ExtensionFunctionDispatcher::CreateExtensionFunction(
 455     const ExtensionHostMsg_Request_Params& params,
 456     const Extension* extension,
 457     int requesting_process_id,
 458     const ProcessMap& process_map,
 459     ExtensionAPI* api,
 460     void* profile_id,
 461     const ExtensionFunction::ResponseCallback& callback) {
 462   ExtensionFunction* function =
 463       ExtensionFunctionRegistry::GetInstance()->NewFunction(params.name);
 464   if (!function) {
 465     LOG(ERROR) << "Unknown Extension API - " << params.name;
 466     SendAccessDenied(callback, function->histogram_value());
 467     return NULL;
 468   }
 469
 470   function->SetArgs(&params.arguments);
 471   function->set_source_url(params.source_url);
 472   function->set_request_id(params.request_id);
 473   function->set_has_callback(params.has_callback);
 474   function->set_user_gesture(params.user_gesture);
 475   function->set_extension(extension);
 476   function->set_profile_id(profile_id);
 477   function->set_response_callback(callback);
 478   function->set_source_tab_id(params.source_tab_id);
 479   function->set_source_context_type(
 480       process_map.GetMostLikelyContextType(extension, requesting_process_id));
 481
 482   return function;
 483 }
 484
 485 // static
 486 void ExtensionFunctionDispatcher::SendAccessDenied(
 487     const ExtensionFunction::ResponseCallback& callback,
 488     functions::HistogramValue histogram_value) {
 489   base::ListValue empty_list;
 490   callback.Run(ExtensionFunction::FAILED, empty_list,
 491                "Access to extension API denied.", histogram_value);
 492 }
 493
 494 }  // namespace extensions