chrome/browser/extensions/chrome_content_browser_client_extensions_part.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 "chrome/browser/extensions/chrome_content_browser_client_extensions_part.h"
   6
   7 #include <set>
   8
   9 #include "base/command_line.h"
  10 #include "chrome/browser/browser_process.h"
  11 #include "chrome/browser/extensions/browser_permissions_policy_delegate.h"
  12 #include "chrome/browser/extensions/extension_service.h"
  13 #include "chrome/browser/extensions/extension_web_ui.h"
  14 #include "chrome/browser/extensions/extension_webkit_preferences.h"
  15 #include "chrome/browser/media_galleries/fileapi/media_file_system_backend.h"
  16 #include "chrome/browser/profiles/profile.h"
  17 #include "chrome/browser/profiles/profile_io_data.h"
  18 #include "chrome/browser/profiles/profile_manager.h"
  19 #include "chrome/browser/renderer_host/chrome_extension_message_filter.h"
  20 #include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
  21 #include "chrome/common/chrome_constants.h"
  22 #include "chrome/common/extensions/extension_process_policy.h"
  23 #include "chrome/common/extensions/manifest_handlers/app_isolation_info.h"
  24 #include "components/guest_view/browser/guest_view_message_filter.h"
  25 #include "content/public/browser/browser_thread.h"
  26 #include "content/public/browser/browser_url_handler.h"
  27 #include "content/public/browser/render_process_host.h"
  28 #include "content/public/browser/render_view_host.h"
  29 #include "content/public/browser/site_instance.h"
  30 #include "content/public/browser/web_contents.h"
  31 #include "content/public/common/content_switches.h"
  32 #include "extensions/browser/api/web_request/web_request_api.h"
  33 #include "extensions/browser/api/web_request/web_request_api_helpers.h"
  34 #include "extensions/browser/extension_host.h"
  35 #include "extensions/browser/extension_message_filter.h"
  36 #include "extensions/browser/extension_registry.h"
  37 #include "extensions/browser/extension_system.h"
  38 #include "extensions/browser/guest_view/extensions_guest_view_message_filter.h"
  39 #include "extensions/browser/info_map.h"
  40 #include "extensions/browser/io_thread_extension_message_filter.h"
  41 #include "extensions/browser/view_type_utils.h"
  42 #include "extensions/common/constants.h"
  43 #include "extensions/common/manifest_handlers/background_info.h"
  44 #include "extensions/common/manifest_handlers/web_accessible_resources_info.h"
  45 #include "extensions/common/switches.h"
  46
  47 using content::BrowserContext;
  48 using content::BrowserThread;
  49 using content::BrowserURLHandler;
  50 using content::RenderViewHost;
  51 using content::SiteInstance;
  52 using content::WebContents;
  53 using content::WebPreferences;
  54
  55 namespace extensions {
  56
  57 namespace {
  58
  59 // Used by the GetPrivilegeRequiredByUrl() and GetProcessPrivilege() functions
  60 // below.  Extension, and isolated apps require different privileges to be
  61 // granted to their RenderProcessHosts.  This classification allows us to make
  62 // sure URLs are served by hosts with the right set of privileges.
  63 enum RenderProcessHostPrivilege {
  64   PRIV_NORMAL,
  65   PRIV_HOSTED,
  66   PRIV_ISOLATED,
  67   PRIV_EXTENSION,
  68 };
  69
  70 RenderProcessHostPrivilege GetPrivilegeRequiredByUrl(
  71     const GURL& url,
  72     ExtensionRegistry* registry) {
  73   // Default to a normal renderer cause it is lower privileged. This should only
  74   // occur if the URL on a site instance is either malformed, or uninitialized.
  75   // If it is malformed, then there is no need for better privileges anyways.
  76   // If it is uninitialized, but eventually settles on being an a scheme other
  77   // than normal webrenderer, the navigation logic will correct us out of band
  78   // anyways.
  79   if (!url.is_valid())
  80     return PRIV_NORMAL;
  81
  82   if (!url.SchemeIs(kExtensionScheme))
  83     return PRIV_NORMAL;
  84
  85   const Extension* extension =
  86       registry->enabled_extensions().GetByID(url.host());
  87   if (extension && AppIsolationInfo::HasIsolatedStorage(extension))
  88     return PRIV_ISOLATED;
  89   if (extension && extension->is_hosted_app())
  90     return PRIV_HOSTED;
  91   return PRIV_EXTENSION;
  92 }
  93
  94 RenderProcessHostPrivilege GetProcessPrivilege(
  95     content::RenderProcessHost* process_host,
  96     ProcessMap* process_map,
  97     ExtensionRegistry* registry) {
  98   std::set<std::string> extension_ids =
  99       process_map->GetExtensionsInProcess(process_host->GetID());
 100   if (extension_ids.empty())
 101     return PRIV_NORMAL;
 102
 103   for (const std::string& extension_id : extension_ids) {
 104     const Extension* extension =
 105         registry->enabled_extensions().GetByID(extension_id);
 106     if (extension && AppIsolationInfo::HasIsolatedStorage(extension))
 107       return PRIV_ISOLATED;
 108     if (extension && extension->is_hosted_app())
 109       return PRIV_HOSTED;
 110   }
 111
 112   return PRIV_EXTENSION;
 113 }
 114
 115 }  // namespace
 116
 117 ChromeContentBrowserClientExtensionsPart::
 118     ChromeContentBrowserClientExtensionsPart() {
 119   permissions_policy_delegate_.reset(new BrowserPermissionsPolicyDelegate());
 120 }
 121
 122 ChromeContentBrowserClientExtensionsPart::
 123     ~ChromeContentBrowserClientExtensionsPart() {
 124 }
 125
 126 // static
 127 GURL ChromeContentBrowserClientExtensionsPart::GetEffectiveURL(
 128     Profile* profile, const GURL& url) {
 129   // If the input |url| is part of an installed app, the effective URL is an
 130   // extension URL with the ID of that extension as the host. This has the
 131   // effect of grouping apps together in a common SiteInstance.
 132   ExtensionRegistry* registry = ExtensionRegistry::Get(profile);
 133   if (!registry)
 134     return url;
 135
 136   const Extension* extension =
 137       registry->enabled_extensions().GetHostedAppByURL(url);
 138   if (!extension)
 139     return url;
 140
 141   // Bookmark apps do not use the hosted app process model, and should be
 142   // treated as normal URLs.
 143   if (extension->from_bookmark())
 144     return url;
 145
 146   // If the URL is part of an extension's web extent, convert it to an
 147   // extension URL.
 148   return extension->GetResourceURL(url.path());
 149 }
 150
 151 // static
 152 bool ChromeContentBrowserClientExtensionsPart::ShouldUseProcessPerSite(
 153     Profile* profile, const GURL& effective_url) {
 154   if (!effective_url.SchemeIs(kExtensionScheme))
 155     return false;
 156
 157   ExtensionRegistry* registry = ExtensionRegistry::Get(profile);
 158   if (!registry)
 159     return false;
 160
 161   const Extension* extension =
 162       registry->enabled_extensions().GetByID(effective_url.host());
 163   if (!extension)
 164     return false;
 165
 166   // If the URL is part of a hosted app that does not have the background
 167   // permission, or that does not allow JavaScript access to the background
 168   // page, we want to give each instance its own process to improve
 169   // responsiveness.
 170   if (extension->GetType() == Manifest::TYPE_HOSTED_APP) {
 171     if (!extension->permissions_data()->HasAPIPermission(
 172             APIPermission::kBackground) ||
 173         !BackgroundInfo::AllowJSAccess(extension)) {
 174       return false;
 175     }
 176   }
 177
 178   // Hosted apps that have script access to their background page must use
 179   // process per site, since all instances can make synchronous calls to the
 180   // background window.  Other extensions should use process per site as well.
 181   return true;
 182 }
 183
 184 // static
 185 bool ChromeContentBrowserClientExtensionsPart::CanCommitURL(
 186     content::RenderProcessHost* process_host, const GURL& url) {
 187   // We need to let most extension URLs commit in any process, since this can
 188   // be allowed due to web_accessible_resources.  Most hosted app URLs may also
 189   // load in any process (e.g., in an iframe).  However, the Chrome Web Store
 190   // cannot be loaded in iframes and should never be requested outside its
 191   // process.
 192   ExtensionRegistry* registry =
 193       ExtensionRegistry::Get(process_host->GetBrowserContext());
 194   if (!registry)
 195     return true;
 196
 197   const Extension* new_extension =
 198       registry->enabled_extensions().GetExtensionOrAppByURL(url);
 199   if (new_extension && new_extension->is_hosted_app() &&
 200       new_extension->id() == extensions::kWebStoreAppId &&
 201       !ProcessMap::Get(process_host->GetBrowserContext())
 202            ->Contains(new_extension->id(), process_host->GetID())) {
 203     return false;
 204   }
 205   return true;
 206 }
 207
 208 // static
 209 bool ChromeContentBrowserClientExtensionsPart::IsSuitableHost(
 210     Profile* profile,
 211     content::RenderProcessHost* process_host,
 212     const GURL& site_url) {
 213   DCHECK(profile);
 214
 215   ExtensionRegistry* registry = ExtensionRegistry::Get(profile);
 216   ProcessMap* process_map = ProcessMap::Get(profile);
 217
 218   // These may be NULL during tests. In that case, just assume any site can
 219   // share any host.
 220   if (!registry || !process_map)
 221     return true;
 222
 223   // Otherwise, just make sure the process privilege matches the privilege
 224   // required by the site.
 225   RenderProcessHostPrivilege privilege_required =
 226       GetPrivilegeRequiredByUrl(site_url, registry);
 227   return GetProcessPrivilege(process_host, process_map, registry) ==
 228          privilege_required;
 229 }
 230
 231 // static
 232 bool
 233 ChromeContentBrowserClientExtensionsPart::ShouldTryToUseExistingProcessHost(
 234     Profile* profile, const GURL& url) {
 235   // This function is trying to limit the amount of processes used by extensions
 236   // with background pages. It uses a globally set percentage of processes to
 237   // run such extensions and if the limit is exceeded, it returns true, to
 238   // indicate to the content module to group extensions together.
 239   ExtensionRegistry* registry =
 240       profile ? ExtensionRegistry::Get(profile) : NULL;
 241   if (!registry)
 242     return false;
 243
 244   // We have to have a valid extension with background page to proceed.
 245   const Extension* extension =
 246       registry->enabled_extensions().GetExtensionOrAppByURL(url);
 247   if (!extension)
 248     return false;
 249   if (!BackgroundInfo::HasBackgroundPage(extension))
 250     return false;
 251
 252   std::set<int> process_ids;
 253   size_t max_process_count =
 254       content::RenderProcessHost::GetMaxRendererProcessCount();
 255
 256   // Go through all profiles to ensure we have total count of extension
 257   // processes containing background pages, otherwise one profile can
 258   // starve the other.
 259   std::vector<Profile*> profiles = g_browser_process->profile_manager()->
 260       GetLoadedProfiles();
 261   for (size_t i = 0; i < profiles.size(); ++i) {
 262     ProcessManager* epm = ProcessManager::Get(profiles[i]);
 263     for (extensions::ExtensionHost* host : epm->background_hosts())
 264       process_ids.insert(host->render_process_host()->GetID());
 265   }
 266
 267   return (process_ids.size() >
 268           (max_process_count * chrome::kMaxShareOfExtensionProcesses));
 269 }
 270
 271 // static
 272 bool ChromeContentBrowserClientExtensionsPart::
 273     ShouldSwapBrowsingInstancesForNavigation(SiteInstance* site_instance,
 274                                              const GURL& current_url,
 275                                              const GURL& new_url) {
 276   // If we don't have an ExtensionRegistry, then rely on the SiteInstance logic
 277   // in RenderFrameHostManager to decide when to swap.
 278   ExtensionRegistry* registry =
 279       ExtensionRegistry::Get(site_instance->GetBrowserContext());
 280   if (!registry)
 281     return false;
 282
 283   // We must use a new BrowsingInstance (forcing a process swap and disabling
 284   // scripting by existing tabs) if one of the URLs is an extension and the
 285   // other is not the exact same extension.
 286   //
 287   // We ignore hosted apps here so that other tabs in their BrowsingInstance can
 288   // use postMessage with them.  (The exception is the Chrome Web Store, which
 289   // is a hosted app that requires its own BrowsingInstance.)  Navigations
 290   // to/from a hosted app will still trigger a SiteInstance swap in
 291   // RenderFrameHostManager.
 292   const Extension* current_extension =
 293       registry->enabled_extensions().GetExtensionOrAppByURL(current_url);
 294   if (current_extension &&
 295       current_extension->is_hosted_app() &&
 296       current_extension->id() != extensions::kWebStoreAppId)
 297     current_extension = NULL;
 298
 299   const Extension* new_extension =
 300       registry->enabled_extensions().GetExtensionOrAppByURL(new_url);
 301   if (new_extension &&
 302       new_extension->is_hosted_app() &&
 303       new_extension->id() != extensions::kWebStoreAppId)
 304     new_extension = NULL;
 305
 306   // First do a process check.  We should force a BrowsingInstance swap if the
 307   // current process doesn't know about new_extension, even if current_extension
 308   // is somehow the same as new_extension.
 309   ProcessMap* process_map = ProcessMap::Get(site_instance->GetBrowserContext());
 310   if (new_extension &&
 311       site_instance->HasProcess() &&
 312       !process_map->Contains(
 313           new_extension->id(), site_instance->GetProcess()->GetID()))
 314     return true;
 315
 316   // Otherwise, swap BrowsingInstances if current_extension and new_extension
 317   // differ.
 318   return current_extension != new_extension;
 319 }
 320
 321 // static
 322 bool ChromeContentBrowserClientExtensionsPart::ShouldSwapProcessesForRedirect(
 323     content::ResourceContext* resource_context,
 324     const GURL& current_url,
 325     const GURL& new_url) {
 326   ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context);
 327   return CrossesExtensionProcessBoundary(
 328       io_data->GetExtensionInfoMap()->extensions(),
 329       current_url, new_url, false);
 330 }
 331
 332 // static
 333 bool ChromeContentBrowserClientExtensionsPart::ShouldAllowOpenURL(
 334     content::SiteInstance* site_instance,
 335     const GURL& from_url,
 336     const GURL& to_url,
 337     bool* result) {
 338   DCHECK(result);
 339
 340   // Do not allow pages from the web or other extensions navigate to
 341   // non-web-accessible extension resources.
 342   if (to_url.SchemeIs(kExtensionScheme) &&
 343       (from_url.SchemeIsHTTPOrHTTPS() || from_url.SchemeIs(kExtensionScheme))) {
 344     Profile* profile = Profile::FromBrowserContext(
 345         site_instance->GetProcess()->GetBrowserContext());
 346     ExtensionRegistry* registry = ExtensionRegistry::Get(profile);
 347     if (!registry) {
 348       *result = true;
 349       return true;
 350     }
 351     const Extension* extension =
 352         registry->enabled_extensions().GetExtensionOrAppByURL(to_url);
 353     if (!extension) {
 354       *result = true;
 355       return true;
 356     }
 357     const Extension* from_extension =
 358         registry->enabled_extensions().GetExtensionOrAppByURL(
 359             site_instance->GetSiteURL());
 360     if (from_extension && from_extension->id() == extension->id()) {
 361       *result = true;
 362       return true;
 363     }
 364
 365     if (!WebAccessibleResourcesInfo::IsResourceWebAccessible(
 366             extension, to_url.path())) {
 367       *result = false;
 368       return true;
 369     }
 370   }
 371   return false;
 372 }
 373
 374 void ChromeContentBrowserClientExtensionsPart::RenderProcessWillLaunch(
 375     content::RenderProcessHost* host) {
 376   int id = host->GetID();
 377   Profile* profile = Profile::FromBrowserContext(host->GetBrowserContext());
 378
 379   host->AddFilter(new ChromeExtensionMessageFilter(id, profile));
 380   host->AddFilter(new ExtensionMessageFilter(id, profile));
 381   host->AddFilter(new IOThreadExtensionMessageFilter(id, profile));
 382   host->AddFilter(new ExtensionsGuestViewMessageFilter(id, profile));
 383   extension_web_request_api_helpers::SendExtensionWebRequestStatusToHost(host);
 384 }
 385
 386 void ChromeContentBrowserClientExtensionsPart::SiteInstanceGotProcess(
 387     SiteInstance* site_instance) {
 388   BrowserContext* context = site_instance->GetProcess()->GetBrowserContext();
 389   ExtensionRegistry* registry = ExtensionRegistry::Get(context);
 390   if (!registry)
 391     return;
 392
 393   const Extension* extension =
 394       registry->enabled_extensions().GetExtensionOrAppByURL(
 395           site_instance->GetSiteURL());
 396   if (!extension)
 397     return;
 398
 399   ProcessMap::Get(context)->Insert(extension->id(),
 400                                    site_instance->GetProcess()->GetID(),
 401                                    site_instance->GetId());
 402
 403   BrowserThread::PostTask(
 404       BrowserThread::IO, FROM_HERE,
 405       base::Bind(&InfoMap::RegisterExtensionProcess,
 406                  ExtensionSystem::Get(context)->info_map(), extension->id(),
 407                  site_instance->GetProcess()->GetID(), site_instance->GetId()));
 408 }
 409
 410 void ChromeContentBrowserClientExtensionsPart::SiteInstanceDeleting(
 411     SiteInstance* site_instance) {
 412   BrowserContext* context = site_instance->GetBrowserContext();
 413   ExtensionRegistry* registry = ExtensionRegistry::Get(context);
 414   if (!registry)
 415     return;
 416
 417   const Extension* extension =
 418       registry->enabled_extensions().GetExtensionOrAppByURL(
 419           site_instance->GetSiteURL());
 420   if (!extension)
 421     return;
 422
 423   ProcessMap::Get(context)->Remove(extension->id(),
 424                                    site_instance->GetProcess()->GetID(),
 425                                    site_instance->GetId());
 426
 427   BrowserThread::PostTask(
 428       BrowserThread::IO, FROM_HERE,
 429       base::Bind(&InfoMap::UnregisterExtensionProcess,
 430                  ExtensionSystem::Get(context)->info_map(), extension->id(),
 431                  site_instance->GetProcess()->GetID(), site_instance->GetId()));
 432 }
 433
 434 void ChromeContentBrowserClientExtensionsPart::OverrideWebkitPrefs(
 435     RenderViewHost* rvh,
 436     WebPreferences* web_prefs) {
 437   const ExtensionRegistry* registry =
 438       ExtensionRegistry::Get(rvh->GetProcess()->GetBrowserContext());
 439   if (!registry)
 440     return;
 441
 442   // Note: it's not possible for kExtensionsScheme to change during the lifetime
 443   // of the process.
 444   //
 445   // Ensure that we are only granting extension preferences to URLs with
 446   // the correct scheme. Without this check, chrome-guest:// schemes used by
 447   // webview tags as well as hosts that happen to match the id of an
 448   // installed extension would get the wrong preferences.
 449   const GURL& site_url = rvh->GetSiteInstance()->GetSiteURL();
 450   if (!site_url.SchemeIs(kExtensionScheme))
 451     return;
 452
 453   WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
 454   ViewType view_type = GetViewType(web_contents);
 455   const Extension* extension =
 456       registry->enabled_extensions().GetByID(site_url.host());
 457   extension_webkit_preferences::SetPreferences(extension, view_type, web_prefs);
 458 }
 459
 460 void ChromeContentBrowserClientExtensionsPart::BrowserURLHandlerCreated(
 461     BrowserURLHandler* handler) {
 462   handler->AddHandlerPair(&ExtensionWebUI::HandleChromeURLOverride,
 463                           BrowserURLHandler::null_handler());
 464   handler->AddHandlerPair(BrowserURLHandler::null_handler(),
 465                           &ExtensionWebUI::HandleChromeURLOverrideReverse);
 466 }
 467
 468 void ChromeContentBrowserClientExtensionsPart::
 469     GetAdditionalAllowedSchemesForFileSystem(
 470         std::vector<std::string>* additional_allowed_schemes) {
 471   additional_allowed_schemes->push_back(kExtensionScheme);
 472 }
 473
 474 void ChromeContentBrowserClientExtensionsPart::GetURLRequestAutoMountHandlers(
 475     std::vector<storage::URLRequestAutoMountHandler>* handlers) {
 476   handlers->push_back(
 477       base::Bind(MediaFileSystemBackend::AttemptAutoMountForURLRequest));
 478 }
 479
 480 void ChromeContentBrowserClientExtensionsPart::GetAdditionalFileSystemBackends(
 481     content::BrowserContext* browser_context,
 482     const base::FilePath& storage_partition_path,
 483     ScopedVector<storage::FileSystemBackend>* additional_backends) {
 484   base::SequencedWorkerPool* pool = content::BrowserThread::GetBlockingPool();
 485   additional_backends->push_back(new MediaFileSystemBackend(
 486       storage_partition_path,
 487       pool->GetSequencedTaskRunner(
 488                 pool->GetNamedSequenceToken(
 489                     MediaFileSystemBackend::kMediaTaskRunnerName)).get()));
 490
 491   additional_backends->push_back(new sync_file_system::SyncFileSystemBackend(
 492       Profile::FromBrowserContext(browser_context)));
 493 }
 494
 495 void ChromeContentBrowserClientExtensionsPart::
 496     AppendExtraRendererCommandLineSwitches(base::CommandLine* command_line,
 497                                            content::RenderProcessHost* process,
 498                                            Profile* profile) {
 499   if (!process)
 500     return;
 501   DCHECK(profile);
 502   if (ProcessMap::Get(profile)->Contains(process->GetID())) {
 503     command_line->AppendSwitch(switches::kExtensionProcess);
 504 #if defined(ENABLE_WEBRTC)
 505     command_line->AppendSwitch(::switches::kEnableWebRtcHWH264Encoding);
 506 #endif
 507     if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 508             switches::kEnableMojoSerialService)) {
 509       command_line->AppendSwitch(switches::kEnableMojoSerialService);
 510     }
 511   }
 512 }
 513
 514 }  // namespace extensions