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