external_provider_impl.cc revision 58e6fbe4ee35d65e14b626c557d37565bf8ad179
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 "chrome/browser/extensions/external_provider_impl.h" 6 7#include <set> 8#include <vector> 9 10#include "base/command_line.h" 11#include "base/files/file_path.h" 12#include "base/logging.h" 13#include "base/memory/linked_ptr.h" 14#include "base/metrics/field_trial.h" 15#include "base/path_service.h" 16#include "base/strings/string_util.h" 17#include "base/values.h" 18#include "base/version.h" 19#include "chrome/browser/app_mode/app_mode_utils.h" 20#include "chrome/browser/browser_process.h" 21#include "chrome/browser/extensions/extension_service.h" 22#include "chrome/browser/extensions/extension_system.h" 23#include "chrome/browser/extensions/external_component_loader.h" 24#include "chrome/browser/extensions/external_policy_loader.h" 25#include "chrome/browser/extensions/external_pref_loader.h" 26#include "chrome/browser/extensions/external_provider_interface.h" 27#include "chrome/browser/profiles/profile.h" 28#include "chrome/common/chrome_paths.h" 29#include "chrome/common/chrome_switches.h" 30#include "chrome/common/extensions/extension.h" 31#include "chrome/common/extensions/manifest.h" 32#include "chrome/common/pref_names.h" 33#include "content/public/browser/browser_thread.h" 34#include "ui/base/l10n/l10n_util.h" 35 36#if defined(ENABLE_MANAGED_USERS) 37#include "chrome/browser/managed_mode/managed_user_service.h" 38#include "chrome/browser/managed_mode/managed_user_service_factory.h" 39#endif 40 41#if defined(OS_CHROMEOS) 42#include "chrome/browser/chromeos/extensions/external_pref_cache_loader.h" 43#include "chrome/browser/chromeos/login/user_manager.h" 44#include "chrome/browser/chromeos/policy/app_pack_updater.h" 45#include "chrome/browser/policy/browser_policy_connector.h" 46#else 47#include "chrome/browser/extensions/default_apps.h" 48#endif 49 50#if defined(OS_WIN) 51#include "chrome/browser/extensions/external_registry_loader_win.h" 52#endif 53 54using content::BrowserThread; 55 56namespace extensions { 57 58// Constants for keeping track of extension preferences in a dictionary. 59const char ExternalProviderImpl::kExternalCrx[] = "external_crx"; 60const char ExternalProviderImpl::kExternalVersion[] = "external_version"; 61const char ExternalProviderImpl::kExternalUpdateUrl[] = "external_update_url"; 62const char ExternalProviderImpl::kSupportedLocales[] = "supported_locales"; 63const char ExternalProviderImpl::kIsBookmarkApp[] = "is_bookmark_app"; 64const char ExternalProviderImpl::kIsFromWebstore[] = "is_from_webstore"; 65const char ExternalProviderImpl::kKeepIfPresent[] = "keep_if_present"; 66 67ExternalProviderImpl::ExternalProviderImpl(VisitorInterface* service, 68 ExternalLoader* loader, 69 Profile* profile, 70 Manifest::Location crx_location, 71 Manifest::Location download_location, 72 int creation_flags) 73 : crx_location_(crx_location), 74 download_location_(download_location), 75 service_(service), 76 ready_(false), 77 loader_(loader), 78 profile_(profile), 79 creation_flags_(creation_flags), 80 auto_acknowledge_(false) { 81 loader_->Init(this); 82} 83 84ExternalProviderImpl::~ExternalProviderImpl() { 85 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 86 loader_->OwnerShutdown(); 87} 88 89void ExternalProviderImpl::VisitRegisteredExtension() { 90 // The loader will call back to SetPrefs. 91 loader_->StartLoading(); 92} 93 94void ExternalProviderImpl::SetPrefs(base::DictionaryValue* prefs) { 95 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 96 97 // Check if the service is still alive. It is possible that it went 98 // away while |loader_| was working on the FILE thread. 99 if (!service_) return; 100 101 prefs_.reset(prefs); 102 ready_ = true; // Queries for extensions are allowed from this point. 103 104 // Set of unsupported extensions that need to be deleted from prefs_. 105 std::set<std::string> unsupported_extensions; 106 107 // Notify ExtensionService about all the extensions this provider has. 108 for (base::DictionaryValue::Iterator i(*prefs_); !i.IsAtEnd(); i.Advance()) { 109 const std::string& extension_id = i.key(); 110 const base::DictionaryValue* extension = NULL; 111 112 if (!Extension::IdIsValid(extension_id)) { 113 LOG(WARNING) << "Malformed extension dictionary: key " 114 << extension_id.c_str() << " is not a valid id."; 115 continue; 116 } 117 118 if (!i.value().GetAsDictionary(&extension)) { 119 LOG(WARNING) << "Malformed extension dictionary: key " 120 << extension_id.c_str() 121 << " has a value that is not a dictionary."; 122 continue; 123 } 124 125 base::FilePath::StringType external_crx; 126 const Value* external_version_value = NULL; 127 std::string external_version; 128 std::string external_update_url; 129 130 bool has_external_crx = extension->GetString(kExternalCrx, &external_crx); 131 132 bool has_external_version = false; 133 if (extension->Get(kExternalVersion, &external_version_value)) { 134 if (external_version_value->IsType(Value::TYPE_STRING)) { 135 external_version_value->GetAsString(&external_version); 136 has_external_version = true; 137 } else { 138 LOG(WARNING) << "Malformed extension dictionary for extension: " 139 << extension_id.c_str() << ". " << kExternalVersion 140 << " value must be a string."; 141 continue; 142 } 143 } 144 145 bool has_external_update_url = extension->GetString(kExternalUpdateUrl, 146 &external_update_url); 147 if (has_external_crx != has_external_version) { 148 LOG(WARNING) << "Malformed extension dictionary for extension: " 149 << extension_id.c_str() << ". " << kExternalCrx 150 << " and " << kExternalVersion << " must be used together."; 151 continue; 152 } 153 154 if (has_external_crx == has_external_update_url) { 155 LOG(WARNING) << "Malformed extension dictionary for extension: " 156 << extension_id.c_str() << ". Exactly one of the " 157 << "followng keys should be used: " << kExternalCrx 158 << ", " << kExternalUpdateUrl << "."; 159 continue; 160 } 161 162 // Check that extension supports current browser locale. 163 const base::ListValue* supported_locales = NULL; 164 if (extension->GetList(kSupportedLocales, &supported_locales)) { 165 std::vector<std::string> browser_locales; 166 l10n_util::GetParentLocales(g_browser_process->GetApplicationLocale(), 167 &browser_locales); 168 169 size_t num_locales = supported_locales->GetSize(); 170 bool locale_supported = false; 171 for (size_t j = 0; j < num_locales; j++) { 172 std::string current_locale; 173 if (supported_locales->GetString(j, ¤t_locale) && 174 l10n_util::IsValidLocaleSyntax(current_locale)) { 175 current_locale = l10n_util::NormalizeLocale(current_locale); 176 if (std::find(browser_locales.begin(), browser_locales.end(), 177 current_locale) != browser_locales.end()) { 178 locale_supported = true; 179 break; 180 } 181 } else { 182 LOG(WARNING) << "Unrecognized locale '" << current_locale 183 << "' found as supported locale for extension: " 184 << extension_id; 185 } 186 } 187 188 if (!locale_supported) { 189 unsupported_extensions.insert(extension_id); 190 VLOG(1) << "Skip installing (or uninstall) external extension: " 191 << extension_id << " because the extension doesn't support " 192 << "the browser locale."; 193 continue; 194 } 195 } 196 197 int creation_flags = creation_flags_; 198 bool is_bookmark_app; 199 if (extension->GetBoolean(kIsBookmarkApp, &is_bookmark_app) && 200 is_bookmark_app) { 201 creation_flags |= Extension::FROM_BOOKMARK; 202 } 203 bool is_from_webstore; 204 if (extension->GetBoolean(kIsFromWebstore, &is_from_webstore) && 205 is_from_webstore) { 206 creation_flags |= Extension::FROM_WEBSTORE; 207 } 208 bool keep_if_present; 209 if (extension->GetBoolean(kKeepIfPresent, &keep_if_present) && 210 keep_if_present && profile_) { 211 ExtensionServiceInterface* extension_service = 212 ExtensionSystem::Get(profile_)->extension_service(); 213 const Extension* extension = extension_service ? 214 extension_service->GetExtensionById(extension_id, true) : NULL; 215 if (!extension) { 216 VLOG(1) << "Skip installing (or uninstall) external extension: " 217 << extension_id << " because the extension should be kept " 218 << "only if it is already installed."; 219 continue; 220 } 221 } 222 223 if (has_external_crx) { 224 if (crx_location_ == Manifest::INVALID_LOCATION) { 225 LOG(WARNING) << "This provider does not support installing external " 226 << "extensions from crx files."; 227 continue; 228 } 229 if (external_crx.find(base::FilePath::kParentDirectory) != 230 base::StringPiece::npos) { 231 LOG(WARNING) << "Path traversal not allowed in path: " 232 << external_crx.c_str(); 233 continue; 234 } 235 236 // If the path is relative, and the provider has a base path, 237 // build the absolute path to the crx file. 238 base::FilePath path(external_crx); 239 if (!path.IsAbsolute()) { 240 base::FilePath base_path = loader_->GetBaseCrxFilePath(); 241 if (base_path.empty()) { 242 LOG(WARNING) << "File path " << external_crx.c_str() 243 << " is relative. An absolute path is required."; 244 continue; 245 } 246 path = base_path.Append(external_crx); 247 } 248 249 Version version(external_version); 250 if (!version.IsValid()) { 251 LOG(WARNING) << "Malformed extension dictionary for extension: " 252 << extension_id.c_str() << ". Invalid version string \"" 253 << external_version << "\"."; 254 continue; 255 } 256 service_->OnExternalExtensionFileFound(extension_id, &version, path, 257 crx_location_, creation_flags, 258 auto_acknowledge_); 259 } else { // if (has_external_update_url) 260 CHECK(has_external_update_url); // Checking of keys above ensures this. 261 if (download_location_ == Manifest::INVALID_LOCATION) { 262 LOG(WARNING) << "This provider does not support installing external " 263 << "extensions from update URLs."; 264 continue; 265 } 266 GURL update_url(external_update_url); 267 if (!update_url.is_valid()) { 268 LOG(WARNING) << "Malformed extension dictionary for extension: " 269 << extension_id.c_str() << ". Key " << kExternalUpdateUrl 270 << " has value \"" << external_update_url 271 << "\", which is not a valid URL."; 272 continue; 273 } 274 service_->OnExternalExtensionUpdateUrlFound( 275 extension_id, update_url, download_location_); 276 } 277 } 278 279 for (std::set<std::string>::iterator it = unsupported_extensions.begin(); 280 it != unsupported_extensions.end(); ++it) { 281 // Remove extension for the list of know external extensions. The extension 282 // will be uninstalled later because provider doesn't provide it anymore. 283 prefs_->Remove(*it, NULL); 284 } 285 286 service_->OnExternalProviderReady(this); 287} 288 289void ExternalProviderImpl::ServiceShutdown() { 290 service_ = NULL; 291} 292 293bool ExternalProviderImpl::IsReady() const { 294 return ready_; 295} 296 297bool ExternalProviderImpl::HasExtension( 298 const std::string& id) const { 299 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 300 CHECK(prefs_.get()); 301 CHECK(ready_); 302 return prefs_->HasKey(id); 303} 304 305bool ExternalProviderImpl::GetExtensionDetails( 306 const std::string& id, Manifest::Location* location, 307 scoped_ptr<Version>* version) const { 308 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 309 CHECK(prefs_.get()); 310 CHECK(ready_); 311 base::DictionaryValue* extension = NULL; 312 if (!prefs_->GetDictionary(id, &extension)) 313 return false; 314 315 Manifest::Location loc = Manifest::INVALID_LOCATION; 316 if (extension->HasKey(kExternalUpdateUrl)) { 317 loc = download_location_; 318 319 } else if (extension->HasKey(kExternalCrx)) { 320 loc = crx_location_; 321 322 std::string external_version; 323 if (!extension->GetString(kExternalVersion, &external_version)) 324 return false; 325 326 if (version) 327 version->reset(new Version(external_version)); 328 329 } else { 330 NOTREACHED(); // Chrome should not allow prefs to get into this state. 331 return false; 332 } 333 334 if (location) 335 *location = loc; 336 337 return true; 338} 339 340// static 341void ExternalProviderImpl::CreateExternalProviders( 342 VisitorInterface* service, 343 Profile* profile, 344 ProviderCollection* provider_list) { 345 // Policies are mandatory so they can't be skipped with command line flag. 346 provider_list->push_back( 347 linked_ptr<ExternalProviderInterface>( 348 new ExternalProviderImpl( 349 service, 350 new ExternalPolicyLoader(profile), 351 profile, 352 Manifest::INVALID_LOCATION, 353 Manifest::EXTERNAL_POLICY_DOWNLOAD, 354 Extension::NO_FLAGS))); 355 356 // In tests don't install extensions from default external sources. 357 // It would only slowdown tests and make them flaky. 358 if (CommandLine::ForCurrentProcess()->HasSwitch( 359 switches::kDisableDefaultApps)) 360 return; 361 362 // No external app install in app mode. 363 if (chrome::IsRunningInForcedAppMode()) 364 return; 365 366 // On Mac OS, items in /Library/... should be written by the superuser. 367 // Check that all components of the path are writable by root only. 368 ExternalPrefLoader::Options check_admin_permissions_on_mac; 369#if defined(OS_MACOSX) 370 check_admin_permissions_on_mac = 371 ExternalPrefLoader::ENSURE_PATH_CONTROLLED_BY_ADMIN; 372#else 373 check_admin_permissions_on_mac = ExternalPrefLoader::NONE; 374#endif 375 376 bool is_chromeos_demo_session = false; 377 int bundled_extension_creation_flags = Extension::NO_FLAGS; 378#if defined(OS_CHROMEOS) 379 chromeos::UserManager* user_manager = chromeos::UserManager::Get(); 380 is_chromeos_demo_session = 381 user_manager && user_manager->IsLoggedInAsDemoUser() && 382 g_browser_process->browser_policy_connector()->GetDeviceMode() == 383 policy::DEVICE_MODE_RETAIL_KIOSK; 384 bundled_extension_creation_flags = Extension::FROM_WEBSTORE | 385 Extension::WAS_INSTALLED_BY_DEFAULT; 386#endif 387 388 bool is_managed_profile = false; 389 int external_apps_path_id = chrome::DIR_EXTERNAL_EXTENSIONS; 390#if defined(ENABLE_MANAGED_USERS) 391 ManagedUserService* managed_user_service = 392 ManagedUserServiceFactory::GetForProfile(profile); 393 is_managed_profile = managed_user_service->ProfileIsManaged(); 394 if (is_managed_profile) 395 external_apps_path_id = chrome::DIR_MANAGED_USERS_DEFAULT_APPS; 396#endif 397 398#if defined(OS_CHROMEOS) 399 typedef chromeos::ExternalPrefCacheLoader PrefLoader; 400#else 401 typedef ExternalPrefLoader PrefLoader; 402#endif 403 404 if (!is_chromeos_demo_session) { 405 provider_list->push_back( 406 linked_ptr<ExternalProviderInterface>( 407 new ExternalProviderImpl( 408 service, 409 new PrefLoader(external_apps_path_id, 410 check_admin_permissions_on_mac), 411 profile, 412 Manifest::EXTERNAL_PREF, 413 Manifest::EXTERNAL_PREF_DOWNLOAD, 414 bundled_extension_creation_flags))); 415 } 416 417 if (!is_managed_profile) { 418#if defined(OS_CHROMEOS) || defined (OS_MACOSX) 419 // Define a per-user source of external extensions. 420 // On Chrome OS, this serves as a source for OEM customization. 421 provider_list->push_back( 422 linked_ptr<ExternalProviderInterface>( 423 new ExternalProviderImpl( 424 service, 425 new ExternalPrefLoader(chrome::DIR_USER_EXTERNAL_EXTENSIONS, 426 ExternalPrefLoader::NONE), 427 profile, 428 Manifest::EXTERNAL_PREF, 429 Manifest::EXTERNAL_PREF_DOWNLOAD, 430 Extension::NO_FLAGS))); 431#endif 432 433#if defined(OS_WIN) 434 provider_list->push_back( 435 linked_ptr<ExternalProviderInterface>( 436 new ExternalProviderImpl( 437 service, 438 new ExternalRegistryLoader, 439 profile, 440 Manifest::EXTERNAL_REGISTRY, 441 Manifest::INVALID_LOCATION, 442 Extension::NO_FLAGS))); 443#endif 444 445#if defined(OS_LINUX) 446 provider_list->push_back( 447 linked_ptr<ExternalProviderInterface>( 448 new ExternalProviderImpl( 449 service, 450 new ExternalPrefLoader( 451 chrome::DIR_STANDALONE_EXTERNAL_EXTENSIONS, 452 ExternalPrefLoader::NONE), 453 profile, 454 Manifest::EXTERNAL_PREF, 455 Manifest::EXTERNAL_PREF_DOWNLOAD, 456 bundled_extension_creation_flags))); 457#endif 458 459#if !defined(OS_CHROMEOS) 460 // The default apps are installed as INTERNAL but use the external 461 // extension installer codeflow. 462 provider_list->push_back( 463 linked_ptr<ExternalProviderInterface>( 464 new default_apps::Provider( 465 profile, 466 service, 467 new ExternalPrefLoader(chrome::DIR_DEFAULT_APPS, 468 ExternalPrefLoader::NONE), 469 Manifest::INTERNAL, 470 Manifest::INVALID_LOCATION, 471 Extension::FROM_WEBSTORE | 472 Extension::WAS_INSTALLED_BY_DEFAULT))); 473#endif 474 475#if defined(OS_CHROMEOS) 476 policy::AppPackUpdater* app_pack_updater = 477 g_browser_process->browser_policy_connector()->GetAppPackUpdater(); 478 if (is_chromeos_demo_session && app_pack_updater && 479 !app_pack_updater->created_external_loader()) { 480 provider_list->push_back( 481 linked_ptr<ExternalProviderInterface>( 482 new ExternalProviderImpl( 483 service, 484 app_pack_updater->CreateExternalLoader(), 485 profile, 486 Manifest::EXTERNAL_PREF, 487 Manifest::INVALID_LOCATION, 488 Extension::NO_FLAGS))); 489 } 490#endif 491 } 492 493 provider_list->push_back( 494 linked_ptr<ExternalProviderInterface>( 495 new ExternalProviderImpl( 496 service, 497 new ExternalComponentLoader(), 498 profile, 499 Manifest::INVALID_LOCATION, 500 Manifest::EXTERNAL_POLICY_DOWNLOAD, 501 Extension::FROM_WEBSTORE | Extension::WAS_INSTALLED_BY_DEFAULT))); 502} 503 504} // namespace extensions 505