external_provider_impl.cc revision 868fa2fe829687343ffae624259930155e16dbd8
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/login/user_manager.h" 43#include "chrome/browser/chromeos/policy/app_pack_updater.h" 44#include "chrome/browser/policy/browser_policy_connector.h" 45#else 46#include "chrome/browser/extensions/default_apps.h" 47#endif 48 49#if defined(OS_WIN) 50#include "chrome/browser/extensions/external_registry_loader_win.h" 51#endif 52 53using content::BrowserThread; 54 55namespace extensions { 56 57// Constants for keeping track of extension preferences in a dictionary. 58const char ExternalProviderImpl::kExternalCrx[] = "external_crx"; 59const char ExternalProviderImpl::kExternalVersion[] = "external_version"; 60const char ExternalProviderImpl::kExternalUpdateUrl[] = "external_update_url"; 61const char ExternalProviderImpl::kSupportedLocales[] = "supported_locales"; 62const char ExternalProviderImpl::kIsBookmarkApp[] = "is_bookmark_app"; 63const char ExternalProviderImpl::kIsFromWebstore[] = "is_from_webstore"; 64const char ExternalProviderImpl::kKeepIfPresent[] = "keep_if_present"; 65 66ExternalProviderImpl::ExternalProviderImpl( 67 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 prefs_(NULL), 77 ready_(false), 78 loader_(loader), 79 profile_(profile), 80 creation_flags_(creation_flags), 81 auto_acknowledge_(false) { 82 loader_->Init(this); 83} 84 85ExternalProviderImpl::~ExternalProviderImpl() { 86 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 87 loader_->OwnerShutdown(); 88} 89 90void ExternalProviderImpl::VisitRegisteredExtension() { 91 // The loader will call back to SetPrefs. 92 loader_->StartLoading(); 93} 94 95void ExternalProviderImpl::SetPrefs(DictionaryValue* prefs) { 96 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 97 98 // Check if the service is still alive. It is possible that it went 99 // away while |loader_| was working on the FILE thread. 100 if (!service_) return; 101 102 prefs_.reset(prefs); 103 ready_ = true; // Queries for extensions are allowed from this point. 104 105 // Set of unsupported extensions that need to be deleted from prefs_. 106 std::set<std::string> unsupported_extensions; 107 108 // Notify ExtensionService about all the extensions this provider has. 109 for (DictionaryValue::Iterator i(*prefs_); !i.IsAtEnd(); i.Advance()) { 110 const std::string& extension_id = i.key(); 111 const DictionaryValue* extension = NULL; 112 113 if (!Extension::IdIsValid(extension_id)) { 114 LOG(WARNING) << "Malformed extension dictionary: key " 115 << extension_id.c_str() << " is not a valid id."; 116 continue; 117 } 118 119 if (!i.value().GetAsDictionary(&extension)) { 120 LOG(WARNING) << "Malformed extension dictionary: key " 121 << extension_id.c_str() 122 << " has a value that is not a dictionary."; 123 continue; 124 } 125 126 base::FilePath::StringType external_crx; 127 const Value* external_version_value = NULL; 128 std::string external_version; 129 std::string external_update_url; 130 131 bool has_external_crx = extension->GetString(kExternalCrx, &external_crx); 132 133 bool has_external_version = false; 134 if (extension->Get(kExternalVersion, &external_version_value)) { 135 if (external_version_value->IsType(Value::TYPE_STRING)) { 136 external_version_value->GetAsString(&external_version); 137 has_external_version = true; 138 } else { 139 LOG(WARNING) << "Malformed extension dictionary for extension: " 140 << extension_id.c_str() << ". " << kExternalVersion 141 << " value must be a string."; 142 continue; 143 } 144 } 145 146 bool has_external_update_url = extension->GetString(kExternalUpdateUrl, 147 &external_update_url); 148 if (has_external_crx != has_external_version) { 149 LOG(WARNING) << "Malformed extension dictionary for extension: " 150 << extension_id.c_str() << ". " << kExternalCrx 151 << " and " << kExternalVersion << " must be used together."; 152 continue; 153 } 154 155 if (has_external_crx == has_external_update_url) { 156 LOG(WARNING) << "Malformed extension dictionary for extension: " 157 << extension_id.c_str() << ". Exactly one of the " 158 << "followng keys should be used: " << kExternalCrx 159 << ", " << kExternalUpdateUrl << "."; 160 continue; 161 } 162 163 // Check that extension supports current browser locale. 164 const ListValue* supported_locales = NULL; 165 if (extension->GetList(kSupportedLocales, &supported_locales)) { 166 std::vector<std::string> browser_locales; 167 l10n_util::GetParentLocales(g_browser_process->GetApplicationLocale(), 168 &browser_locales); 169 170 size_t num_locales = supported_locales->GetSize(); 171 bool locale_supported = false; 172 for (size_t j = 0; j < num_locales; j++) { 173 std::string current_locale; 174 if (supported_locales->GetString(j, ¤t_locale) && 175 l10n_util::IsValidLocaleSyntax(current_locale)) { 176 current_locale = l10n_util::NormalizeLocale(current_locale); 177 if (std::find(browser_locales.begin(), browser_locales.end(), 178 current_locale) != browser_locales.end()) { 179 locale_supported = true; 180 break; 181 } 182 } else { 183 LOG(WARNING) << "Unrecognized locale '" << current_locale 184 << "' found as supported locale for extension: " 185 << extension_id; 186 } 187 } 188 189 if (!locale_supported) { 190 unsupported_extensions.insert(extension_id); 191 VLOG(1) << "Skip installing (or uninstall) external extension: " 192 << extension_id << " because the extension doesn't support " 193 << "the browser locale."; 194 continue; 195 } 196 } 197 198 int creation_flags = creation_flags_; 199 bool is_bookmark_app; 200 if (extension->GetBoolean(kIsBookmarkApp, &is_bookmark_app) && 201 is_bookmark_app) { 202 creation_flags |= Extension::FROM_BOOKMARK; 203 } 204 bool is_from_webstore; 205 if (extension->GetBoolean(kIsFromWebstore, &is_from_webstore) && 206 is_from_webstore) { 207 creation_flags |= Extension::FROM_WEBSTORE; 208 } 209 bool keep_if_present; 210 if (extension->GetBoolean(kKeepIfPresent, &keep_if_present) && 211 keep_if_present && profile_) { 212 ExtensionServiceInterface* extension_service = 213 ExtensionSystem::Get(profile_)->extension_service(); 214 const Extension* extension = extension_service ? 215 extension_service->GetExtensionById(extension_id, true) : NULL; 216 if (!extension) { 217 VLOG(1) << "Skip installing (or uninstall) external extension: " 218 << extension_id << " because the extension should be kept " 219 << "only if it is already installed."; 220 continue; 221 } 222 } 223 224 if (has_external_crx) { 225 if (crx_location_ == Manifest::INVALID_LOCATION) { 226 LOG(WARNING) << "This provider does not support installing external " 227 << "extensions from crx files."; 228 continue; 229 } 230 if (external_crx.find(base::FilePath::kParentDirectory) != 231 base::StringPiece::npos) { 232 LOG(WARNING) << "Path traversal not allowed in path: " 233 << external_crx.c_str(); 234 continue; 235 } 236 237 // If the path is relative, and the provider has a base path, 238 // build the absolute path to the crx file. 239 base::FilePath path(external_crx); 240 if (!path.IsAbsolute()) { 241 base::FilePath base_path = loader_->GetBaseCrxFilePath(); 242 if (base_path.empty()) { 243 LOG(WARNING) << "File path " << external_crx.c_str() 244 << " is relative. An absolute path is required."; 245 continue; 246 } 247 path = base_path.Append(external_crx); 248 } 249 250 Version version(external_version); 251 if (!version.IsValid()) { 252 LOG(WARNING) << "Malformed extension dictionary for extension: " 253 << extension_id.c_str() << ". Invalid version string \"" 254 << external_version << "\"."; 255 continue; 256 } 257 service_->OnExternalExtensionFileFound(extension_id, &version, path, 258 crx_location_, creation_flags, 259 auto_acknowledge_); 260 } else { // if (has_external_update_url) 261 CHECK(has_external_update_url); // Checking of keys above ensures this. 262 if (download_location_ == Manifest::INVALID_LOCATION) { 263 LOG(WARNING) << "This provider does not support installing external " 264 << "extensions from update URLs."; 265 continue; 266 } 267 GURL update_url(external_update_url); 268 if (!update_url.is_valid()) { 269 LOG(WARNING) << "Malformed extension dictionary for extension: " 270 << extension_id.c_str() << ". Key " << kExternalUpdateUrl 271 << " has value \"" << external_update_url 272 << "\", which is not a valid URL."; 273 continue; 274 } 275 service_->OnExternalExtensionUpdateUrlFound( 276 extension_id, update_url, download_location_); 277 } 278 } 279 280 for (std::set<std::string>::iterator it = unsupported_extensions.begin(); 281 it != unsupported_extensions.end(); ++it) { 282 // Remove extension for the list of know external extensions. The extension 283 // will be uninstalled later because provider doesn't provide it anymore. 284 prefs_->Remove(*it, NULL); 285 } 286 287 service_->OnExternalProviderReady(this); 288} 289 290void ExternalProviderImpl::ServiceShutdown() { 291 service_ = NULL; 292} 293 294bool ExternalProviderImpl::IsReady() const { 295 return ready_; 296} 297 298bool ExternalProviderImpl::HasExtension( 299 const std::string& id) const { 300 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 301 CHECK(prefs_.get()); 302 CHECK(ready_); 303 return prefs_->HasKey(id); 304} 305 306bool ExternalProviderImpl::GetExtensionDetails( 307 const std::string& id, Manifest::Location* location, 308 scoped_ptr<Version>* version) const { 309 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 310 CHECK(prefs_.get()); 311 CHECK(ready_); 312 DictionaryValue* extension = NULL; 313 if (!prefs_->GetDictionary(id, &extension)) 314 return false; 315 316 Manifest::Location loc = Manifest::INVALID_LOCATION; 317 if (extension->HasKey(kExternalUpdateUrl)) { 318 loc = download_location_; 319 320 } else if (extension->HasKey(kExternalCrx)) { 321 loc = crx_location_; 322 323 std::string external_version; 324 if (!extension->GetString(kExternalVersion, &external_version)) 325 return false; 326 327 if (version) 328 version->reset(new Version(external_version)); 329 330 } else { 331 NOTREACHED(); // Chrome should not allow prefs to get into this state. 332 return false; 333 } 334 335 if (location) 336 *location = loc; 337 338 return true; 339} 340 341// static 342void ExternalProviderImpl::CreateExternalProviders( 343 VisitorInterface* service, 344 Profile* profile, 345 ProviderCollection* provider_list) { 346 // Policies are mandatory so they can't be skipped with command line flag. 347 provider_list->push_back( 348 linked_ptr<ExternalProviderInterface>( 349 new ExternalProviderImpl( 350 service, 351 new ExternalPolicyLoader(profile), 352 profile, 353 Manifest::INVALID_LOCATION, 354 Manifest::EXTERNAL_POLICY_DOWNLOAD, 355 Extension::NO_FLAGS))); 356 357 // In tests don't install extensions from default external sources. 358 // It would only slowdown tests and make them flaky. 359 if (CommandLine::ForCurrentProcess()->HasSwitch( 360 switches::kDisableDefaultApps)) 361 return; 362 363 // No external app install in app mode. 364 if (chrome::IsRunningInForcedAppMode()) 365 return; 366 367 // On Mac OS, items in /Library/... should be written by the superuser. 368 // Check that all components of the path are writable by root only. 369 ExternalPrefLoader::Options check_admin_permissions_on_mac; 370#if defined(OS_MACOSX) 371 check_admin_permissions_on_mac = 372 ExternalPrefLoader::ENSURE_PATH_CONTROLLED_BY_ADMIN; 373#else 374 check_admin_permissions_on_mac = ExternalPrefLoader::NONE; 375#endif 376 377 bool is_chromeos_demo_session = false; 378 int bundled_extension_creation_flags = Extension::NO_FLAGS; 379#if defined(OS_CHROMEOS) 380 chromeos::UserManager* user_manager = chromeos::UserManager::Get(); 381 is_chromeos_demo_session = 382 user_manager && user_manager->IsLoggedInAsDemoUser() && 383 g_browser_process->browser_policy_connector()->GetDeviceMode() == 384 policy::DEVICE_MODE_KIOSK; 385 bundled_extension_creation_flags = Extension::FROM_WEBSTORE | 386 Extension::WAS_INSTALLED_BY_DEFAULT; 387#endif 388 389 bool is_managed_profile = false; 390 int external_apps_path_id = chrome::DIR_EXTERNAL_EXTENSIONS; 391#if defined(ENABLE_MANAGED_USERS) 392 ManagedUserService* managed_user_service = 393 ManagedUserServiceFactory::GetForProfile(profile); 394 is_managed_profile = managed_user_service->ProfileIsManaged(); 395 if (is_managed_profile) 396 external_apps_path_id = chrome::DIR_MANAGED_USERS_DEFAULT_APPS; 397#endif 398 399 if (!is_chromeos_demo_session) { 400 provider_list->push_back( 401 linked_ptr<ExternalProviderInterface>( 402 new ExternalProviderImpl( 403 service, 404 new ExternalPrefLoader(external_apps_path_id, 405 check_admin_permissions_on_mac), 406 profile, 407 Manifest::EXTERNAL_PREF, 408 Manifest::EXTERNAL_PREF_DOWNLOAD, 409 bundled_extension_creation_flags))); 410 } 411 412 if (!is_managed_profile) { 413#if defined(OS_CHROMEOS) || defined (OS_MACOSX) 414 // Define a per-user source of external extensions. 415 // On Chrome OS, this serves as a source for OEM customization. 416 provider_list->push_back( 417 linked_ptr<ExternalProviderInterface>( 418 new ExternalProviderImpl( 419 service, 420 new ExternalPrefLoader(chrome::DIR_USER_EXTERNAL_EXTENSIONS, 421 ExternalPrefLoader::NONE), 422 profile, 423 Manifest::EXTERNAL_PREF, 424 Manifest::EXTERNAL_PREF_DOWNLOAD, 425 Extension::NO_FLAGS))); 426#endif 427 428#if defined(OS_WIN) 429 provider_list->push_back( 430 linked_ptr<ExternalProviderInterface>( 431 new ExternalProviderImpl( 432 service, 433 new ExternalRegistryLoader, 434 profile, 435 Manifest::EXTERNAL_REGISTRY, 436 Manifest::INVALID_LOCATION, 437 Extension::NO_FLAGS))); 438#endif 439 440#if defined(OS_LINUX) 441 provider_list->push_back( 442 linked_ptr<ExternalProviderInterface>( 443 new ExternalProviderImpl( 444 service, 445 new ExternalPrefLoader( 446 chrome::DIR_STANDALONE_EXTERNAL_EXTENSIONS, 447 ExternalPrefLoader::NONE), 448 profile, 449 Manifest::EXTERNAL_PREF, 450 Manifest::EXTERNAL_PREF_DOWNLOAD, 451 bundled_extension_creation_flags))); 452#endif 453 454#if !defined(OS_CHROMEOS) 455 // The default apps are installed as INTERNAL but use the external 456 // extension installer codeflow. 457 provider_list->push_back( 458 linked_ptr<ExternalProviderInterface>( 459 new default_apps::Provider( 460 profile, 461 service, 462 new ExternalPrefLoader(chrome::DIR_DEFAULT_APPS, 463 ExternalPrefLoader::NONE), 464 Manifest::INTERNAL, 465 Manifest::INVALID_LOCATION, 466 Extension::FROM_WEBSTORE | 467 Extension::WAS_INSTALLED_BY_DEFAULT))); 468#endif 469 470#if defined(OS_CHROMEOS) 471 policy::AppPackUpdater* app_pack_updater = 472 g_browser_process->browser_policy_connector()->GetAppPackUpdater(); 473 if (is_chromeos_demo_session && app_pack_updater && 474 !app_pack_updater->created_external_loader()) { 475 provider_list->push_back( 476 linked_ptr<ExternalProviderInterface>( 477 new ExternalProviderImpl( 478 service, 479 app_pack_updater->CreateExternalLoader(), 480 profile, 481 Manifest::EXTERNAL_PREF, 482 Manifest::INVALID_LOCATION, 483 Extension::NO_FLAGS))); 484 } 485#endif 486 } 487 488 provider_list->push_back( 489 linked_ptr<ExternalProviderInterface>( 490 new ExternalProviderImpl( 491 service, 492 new ExternalComponentLoader(), 493 profile, 494 Manifest::INVALID_LOCATION, 495 Manifest::EXTERNAL_POLICY_DOWNLOAD, 496 Extension::FROM_WEBSTORE | Extension::WAS_INSTALLED_BY_DEFAULT))); 497} 498 499} // namespace extensions 500