chrome/browser/extensions/crx_installer.cc

   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/crx_installer.h"
   6
   7 #include <map>
   8 #include <set>
   9
  10 #include "base/bind.h"
  11 #include "base/files/file_util.h"
  12 #include "base/files/scoped_temp_dir.h"
  13 #include "base/lazy_instance.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/sequenced_task_runner.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/stringprintf.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "base/threading/sequenced_worker_pool.h"
  20 #include "base/threading/thread_restrictions.h"
  21 #include "base/time/time.h"
  22 #include "base/version.h"
  23 #include "chrome/browser/extensions/convert_user_script.h"
  24 #include "chrome/browser/extensions/convert_web_app.h"
  25 #include "chrome/browser/extensions/extension_assets_manager.h"
  26 #include "chrome/browser/extensions/extension_error_reporter.h"
  27 #include "chrome/browser/extensions/extension_service.h"
  28 #include "chrome/browser/extensions/install_tracker.h"
  29 #include "chrome/browser/extensions/install_tracker_factory.h"
  30 #include "chrome/browser/extensions/permissions_updater.h"
  31 #include "chrome/browser/extensions/webstore_installer.h"
  32 #include "chrome/browser/profiles/profile.h"
  33 #include "chrome/browser/web_applications/web_app.h"
  34 #include "chrome/common/chrome_paths.h"
  35 #include "chrome/common/extensions/extension_constants.h"
  36 #include "chrome/grit/generated_resources.h"
  37 #include "content/public/browser/browser_thread.h"
  38 #include "content/public/browser/notification_service.h"
  39 #include "content/public/browser/resource_dispatcher_host.h"
  40 #include "content/public/browser/user_metrics.h"
  41 #include "extensions/browser/extension_prefs.h"
  42 #include "extensions/browser/extension_registry.h"
  43 #include "extensions/browser/extension_system.h"
  44 #include "extensions/browser/install/crx_install_error.h"
  45 #include "extensions/browser/install/extension_install_ui.h"
  46 #include "extensions/browser/install_flag.h"
  47 #include "extensions/browser/notification_types.h"
  48 #include "extensions/common/extension_icon_set.h"
  49 #include "extensions/common/feature_switch.h"
  50 #include "extensions/common/file_util.h"
  51 #include "extensions/common/manifest.h"
  52 #include "extensions/common/manifest_handlers/kiosk_mode_info.h"
  53 #include "extensions/common/manifest_handlers/shared_module_info.h"
  54 #include "extensions/common/manifest_url_handlers.h"
  55 #include "extensions/common/permissions/permission_message_provider.h"
  56 #include "extensions/common/permissions/permission_set.h"
  57 #include "extensions/common/permissions/permissions_data.h"
  58 #include "extensions/common/user_script.h"
  59 #include "grit/extensions_strings.h"
  60 #include "third_party/skia/include/core/SkBitmap.h"
  61 #include "ui/base/l10n/l10n_util.h"
  62
  63 #if defined(OS_CHROMEOS)
  64 #include "components/user_manager/user_manager.h"
  65 #endif
  66
  67 using base::UserMetricsAction;
  68 using content::BrowserThread;
  69 using extensions::SharedModuleInfo;
  70
  71 namespace extensions {
  72
  73 namespace {
  74
  75 // Used in histograms; do not change order.
  76 enum OffStoreInstallDecision {
  77   OnStoreInstall,
  78   OffStoreInstallAllowed,
  79   OffStoreInstallDisallowed,
  80   NumOffStoreInstallDecision
  81 };
  82
  83 }  // namespace
  84
  85 // static
  86 scoped_refptr<CrxInstaller> CrxInstaller::CreateSilent(
  87     ExtensionService* frontend) {
  88   return new CrxInstaller(frontend->AsWeakPtr(),
  89                           scoped_ptr<ExtensionInstallPrompt>(),
  90                           NULL);
  91 }
  92
  93 // static
  94 scoped_refptr<CrxInstaller> CrxInstaller::Create(
  95     ExtensionService* frontend,
  96     scoped_ptr<ExtensionInstallPrompt> client) {
  97   return new CrxInstaller(frontend->AsWeakPtr(), client.Pass(), NULL);
  98 }
  99
 100 // static
 101 scoped_refptr<CrxInstaller> CrxInstaller::Create(
 102     ExtensionService* service,
 103     scoped_ptr<ExtensionInstallPrompt> client,
 104     const WebstoreInstaller::Approval* approval) {
 105   return new CrxInstaller(service->AsWeakPtr(), client.Pass(), approval);
 106 }
 107
 108 CrxInstaller::CrxInstaller(base::WeakPtr<ExtensionService> service_weak,
 109                            scoped_ptr<ExtensionInstallPrompt> client,
 110                            const WebstoreInstaller::Approval* approval)
 111     : install_directory_(service_weak->install_directory()),
 112       install_source_(Manifest::INTERNAL),
 113       approved_(false),
 114       hash_check_failed_(false),
 115       expected_manifest_check_level_(
 116           WebstoreInstaller::MANIFEST_CHECK_LEVEL_STRICT),
 117       expected_version_strict_checking_(false),
 118       extensions_enabled_(service_weak->extensions_enabled()),
 119       delete_source_(false),
 120       create_app_shortcut_(false),
 121       service_weak_(service_weak),
 122       // See header file comment on |client_| for why we use a raw pointer here.
 123       client_(client.release()),
 124       apps_require_extension_mime_type_(false),
 125       allow_silent_install_(false),
 126       grant_permissions_(true),
 127       install_cause_(extension_misc::INSTALL_CAUSE_UNSET),
 128       creation_flags_(Extension::NO_FLAGS),
 129       off_store_install_allow_reason_(OffStoreInstallDisallowed),
 130       did_handle_successfully_(true),
 131       error_on_unsupported_requirements_(false),
 132       update_from_settings_page_(false),
 133       install_flags_(kInstallFlagNone),
 134       install_checker_(service_weak->profile()) {
 135   installer_task_runner_ = service_weak->GetFileTaskRunner();
 136   if (!approval)
 137     return;
 138
 139   CHECK(profile()->IsSameProfile(approval->profile));
 140   if (client_) {
 141     client_->install_ui()->SetUseAppInstalledBubble(
 142         approval->use_app_installed_bubble);
 143     client_->install_ui()->SetSkipPostInstallUI(approval->skip_post_install_ui);
 144   }
 145
 146   if (approval->skip_install_dialog) {
 147     // Mark the extension as approved, but save the expected manifest and ID
 148     // so we can check that they match the CRX's.
 149     approved_ = true;
 150     expected_manifest_check_level_ = approval->manifest_check_level;
 151     if (expected_manifest_check_level_ !=
 152         WebstoreInstaller::MANIFEST_CHECK_LEVEL_NONE)
 153       expected_manifest_.reset(approval->manifest->DeepCopy());
 154     expected_id_ = approval->extension_id;
 155   }
 156   if (approval->minimum_version.get()) {
 157     expected_version_.reset(new Version(*approval->minimum_version));
 158     expected_version_strict_checking_ = false;
 159   }
 160
 161   show_dialog_callback_ = approval->show_dialog_callback;
 162   set_is_ephemeral(approval->is_ephemeral);
 163 }
 164
 165 CrxInstaller::~CrxInstaller() {
 166   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 167   // Ensure |client_| and |install_checker_| data members are destroyed on the
 168   // UI thread. The |client_| dialog has a weak reference as |this| is its
 169   // delegate, and |install_checker_| owns WeakPtrs, so must be destroyed on the
 170   // same thread that created it.
 171 }
 172
 173 void CrxInstaller::InstallCrx(const base::FilePath& source_file) {
 174   InstallCrxFile(CRXFileInfo(source_file));
 175 }
 176
 177 void CrxInstaller::InstallCrxFile(const CRXFileInfo& source_file) {
 178   ExtensionService* service = service_weak_.get();
 179   if (!service || service->browser_terminating())
 180     return;
 181
 182   NotifyCrxInstallBegin();
 183
 184   source_file_ = source_file.path;
 185
 186   scoped_refptr<SandboxedUnpacker> unpacker(new SandboxedUnpacker(
 187       install_source_, creation_flags_, install_directory_,
 188       installer_task_runner_.get(), this));
 189
 190   if (!installer_task_runner_->PostTask(
 191           FROM_HERE, base::Bind(&SandboxedUnpacker::StartWithCrx,
 192                                 unpacker.get(), source_file))) {
 193     NOTREACHED();
 194   }
 195 }
 196
 197 void CrxInstaller::InstallUserScript(const base::FilePath& source_file,
 198                                      const GURL& download_url) {
 199   DCHECK(!download_url.is_empty());
 200
 201   NotifyCrxInstallBegin();
 202
 203   source_file_ = source_file;
 204   download_url_ = download_url;
 205
 206   if (!installer_task_runner_->PostTask(
 207           FROM_HERE,
 208           base::Bind(&CrxInstaller::ConvertUserScriptOnFileThread, this)))
 209     NOTREACHED();
 210 }
 211
 212 void CrxInstaller::ConvertUserScriptOnFileThread() {
 213   base::string16 error;
 214   scoped_refptr<Extension> extension = ConvertUserScriptToExtension(
 215       source_file_, download_url_, install_directory_, &error);
 216   if (!extension.get()) {
 217     ReportFailureFromFileThread(CrxInstallError(error));
 218     return;
 219   }
 220
 221   OnUnpackSuccess(extension->path(), extension->path(), NULL, extension.get(),
 222                   SkBitmap());
 223 }
 224
 225 void CrxInstaller::InstallWebApp(const WebApplicationInfo& web_app) {
 226   NotifyCrxInstallBegin();
 227
 228   if (!installer_task_runner_->PostTask(
 229           FROM_HERE,
 230           base::Bind(&CrxInstaller::ConvertWebAppOnFileThread, this, web_app)))
 231     NOTREACHED();
 232 }
 233
 234 void CrxInstaller::ConvertWebAppOnFileThread(
 235     const WebApplicationInfo& web_app) {
 236   scoped_refptr<Extension> extension(ConvertWebAppToExtension(
 237       web_app, base::Time::Now(), install_directory_));
 238   if (!extension.get()) {
 239     // Validation should have stopped any potential errors before getting here.
 240     NOTREACHED() << "Could not convert web app to extension.";
 241     return;
 242   }
 243
 244   // TODO(aa): conversion data gets lost here :(
 245
 246   OnUnpackSuccess(extension->path(), extension->path(), NULL, extension.get(),
 247                   SkBitmap());
 248 }
 249
 250 CrxInstallError CrxInstaller::AllowInstall(const Extension* extension) {
 251   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 252
 253   // Make sure the expected ID matches if one was supplied or if we want to
 254   // bypass the prompt.
 255   if ((approved_ || !expected_id_.empty()) &&
 256       expected_id_ != extension->id()) {
 257     return CrxInstallError(l10n_util::GetStringFUTF16(
 258         IDS_EXTENSION_INSTALL_UNEXPECTED_ID, base::ASCIIToUTF16(expected_id_),
 259         base::ASCIIToUTF16(extension->id())));
 260   }
 261
 262   if (expected_version_.get()) {
 263     if (expected_version_strict_checking_) {
 264       if (!expected_version_->Equals(*extension->version())) {
 265         return CrxInstallError(l10n_util::GetStringFUTF16(
 266             IDS_EXTENSION_INSTALL_UNEXPECTED_VERSION,
 267             base::ASCIIToUTF16(expected_version_->GetString()),
 268             base::ASCIIToUTF16(extension->version()->GetString())));
 269       }
 270     } else {
 271       if (extension->version()->CompareTo(*expected_version_) < 0) {
 272         return CrxInstallError(l10n_util::GetStringFUTF16(
 273             IDS_EXTENSION_INSTALL_UNEXPECTED_VERSION,
 274             base::ASCIIToUTF16(expected_version_->GetString() + "+"),
 275             base::ASCIIToUTF16(extension->version()->GetString())));
 276       }
 277     }
 278   }
 279
 280   // Make sure the manifests match if we want to bypass the prompt.
 281   if (approved_) {
 282     bool valid = false;
 283     if (expected_manifest_check_level_ ==
 284         WebstoreInstaller::MANIFEST_CHECK_LEVEL_NONE) {
 285         // To skip manifest checking, the extension must be a shared module
 286         // and not request any permissions.
 287       if (SharedModuleInfo::IsSharedModule(extension) &&
 288           extension->permissions_data()->active_permissions()->IsEmpty()) {
 289           valid = true;
 290         }
 291     } else {
 292       valid = expected_manifest_->Equals(original_manifest_.get());
 293       if (!valid && expected_manifest_check_level_ ==
 294           WebstoreInstaller::MANIFEST_CHECK_LEVEL_LOOSE) {
 295         std::string error;
 296         scoped_refptr<Extension> dummy_extension =
 297             Extension::Create(base::FilePath(),
 298                               install_source_,
 299                               *expected_manifest_->value(),
 300                               creation_flags_,
 301                               extension->id(),
 302                               &error);
 303         if (error.empty()) {
 304           scoped_refptr<const PermissionSet> expected_permissions =
 305               dummy_extension->permissions_data()->active_permissions();
 306           valid = !(PermissionMessageProvider::Get()->IsPrivilegeIncrease(
 307               expected_permissions.get(),
 308               extension->permissions_data()->active_permissions().get(),
 309               extension->GetType()));
 310         }
 311       }
 312     }
 313
 314     if (!valid)
 315       return CrxInstallError(
 316           l10n_util::GetStringUTF16(IDS_EXTENSION_MANIFEST_INVALID));
 317   }
 318
 319   // The checks below are skipped for themes and external installs.
 320   // TODO(pamg): After ManagementPolicy refactoring is complete, remove this
 321   // and other uses of install_source_ that are no longer needed now that the
 322   // SandboxedUnpacker sets extension->location.
 323   if (extension->is_theme() || Manifest::IsExternalLocation(install_source_))
 324     return CrxInstallError();
 325
 326   if (!extensions_enabled_) {
 327     return CrxInstallError(
 328         CrxInstallError::ERROR_DECLINED,
 329         l10n_util::GetStringUTF16(IDS_EXTENSION_INSTALL_NOT_ENABLED));
 330   }
 331
 332   if (install_cause_ == extension_misc::INSTALL_CAUSE_USER_DOWNLOAD) {
 333     if (FeatureSwitch::easy_off_store_install()->IsEnabled()) {
 334       const char kHistogramName[] = "Extensions.OffStoreInstallDecisionEasy";
 335       if (is_gallery_install()) {
 336         UMA_HISTOGRAM_ENUMERATION(kHistogramName, OnStoreInstall,
 337                                   NumOffStoreInstallDecision);
 338       } else {
 339         UMA_HISTOGRAM_ENUMERATION(kHistogramName, OffStoreInstallAllowed,
 340                                   NumOffStoreInstallDecision);
 341       }
 342     } else {
 343       const char kHistogramName[] = "Extensions.OffStoreInstallDecisionHard";
 344       if (is_gallery_install()) {
 345         UMA_HISTOGRAM_ENUMERATION(kHistogramName, OnStoreInstall,
 346                                   NumOffStoreInstallDecision);
 347       } else if (off_store_install_allow_reason_ != OffStoreInstallDisallowed) {
 348         UMA_HISTOGRAM_ENUMERATION(kHistogramName, OffStoreInstallAllowed,
 349                                   NumOffStoreInstallDecision);
 350         UMA_HISTOGRAM_ENUMERATION("Extensions.OffStoreInstallAllowReason",
 351                                   off_store_install_allow_reason_,
 352                                   NumOffStoreInstallAllowReasons);
 353       } else {
 354         UMA_HISTOGRAM_ENUMERATION(kHistogramName, OffStoreInstallDisallowed,
 355                                   NumOffStoreInstallDecision);
 356         // Don't delete source in this case so that the user can install
 357         // manually if they want.
 358         delete_source_ = false;
 359         did_handle_successfully_ = false;
 360
 361         return CrxInstallError(CrxInstallError::ERROR_OFF_STORE,
 362                                l10n_util::GetStringUTF16(
 363                                    IDS_EXTENSION_INSTALL_DISALLOWED_ON_SITE));
 364       }
 365     }
 366   }
 367
 368   if (install_checker_.extension()->is_app()) {
 369     // If the app was downloaded, apps_require_extension_mime_type_
 370     // will be set.  In this case, check that it was served with the
 371     // right mime type.  Make an exception for file URLs, which come
 372     // from the users computer and have no headers.
 373     if (!download_url_.SchemeIsFile() &&
 374         apps_require_extension_mime_type_ &&
 375         original_mime_type_ != Extension::kMimeType) {
 376       return CrxInstallError(l10n_util::GetStringFUTF16(
 377           IDS_EXTENSION_INSTALL_INCORRECT_APP_CONTENT_TYPE,
 378           base::ASCIIToUTF16(Extension::kMimeType)));
 379     }
 380
 381     // If the client_ is NULL, then the app is either being installed via
 382     // an internal mechanism like sync, external_extensions, or default apps.
 383     // In that case, we don't want to enforce things like the install origin.
 384     if (!is_gallery_install() && client_) {
 385       // For apps with a gallery update URL, require that they be installed
 386       // from the gallery.
 387       // TODO(erikkay) Apply this rule for paid extensions and themes as well.
 388       if (ManifestURL::UpdatesFromGallery(extension)) {
 389         return CrxInstallError(l10n_util::GetStringFUTF16(
 390             IDS_EXTENSION_DISALLOW_NON_DOWNLOADED_GALLERY_INSTALLS,
 391             l10n_util::GetStringUTF16(IDS_EXTENSION_WEB_STORE_TITLE)));
 392       }
 393
 394       // For self-hosted apps, verify that the entire extent is on the same
 395       // host (or a subdomain of the host) the download happened from.  There's
 396       // no way for us to verify that the app controls any other hosts.
 397       URLPattern pattern(UserScript::ValidUserScriptSchemes());
 398       pattern.SetHost(download_url_.host());
 399       pattern.SetMatchSubdomains(true);
 400
 401       URLPatternSet patterns = install_checker_.extension()->web_extent();
 402       for (URLPatternSet::const_iterator i = patterns.begin();
 403            i != patterns.end(); ++i) {
 404         if (!pattern.MatchesHost(i->host())) {
 405           return CrxInstallError(l10n_util::GetStringUTF16(
 406               IDS_EXTENSION_INSTALL_INCORRECT_INSTALL_HOST));
 407         }
 408       }
 409     }
 410   }
 411
 412   return CrxInstallError();
 413 }
 414
 415 void CrxInstaller::OnUnpackFailure(const CrxInstallError& error) {
 416   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 417
 418   UMA_HISTOGRAM_ENUMERATION("Extensions.UnpackFailureInstallSource",
 419                             install_source(), Manifest::NUM_LOCATIONS);
 420
 421   UMA_HISTOGRAM_ENUMERATION("Extensions.UnpackFailureInstallCause",
 422                             install_cause(),
 423                             extension_misc::NUM_INSTALL_CAUSES);
 424
 425   ReportFailureFromFileThread(error);
 426 }
 427
 428 void CrxInstaller::OnUnpackSuccess(
 429     const base::FilePath& temp_dir,
 430     const base::FilePath& extension_dir,
 431     const base::DictionaryValue* original_manifest,
 432     const Extension* extension,
 433     const SkBitmap& install_icon) {
 434   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 435
 436   UMA_HISTOGRAM_ENUMERATION("Extensions.UnpackSuccessInstallSource",
 437                             install_source(), Manifest::NUM_LOCATIONS);
 438
 439
 440   UMA_HISTOGRAM_ENUMERATION("Extensions.UnpackSuccessInstallCause",
 441                             install_cause(),
 442                             extension_misc::NUM_INSTALL_CAUSES);
 443
 444   install_checker_.set_extension(extension);
 445   temp_dir_ = temp_dir;
 446   if (!install_icon.empty())
 447     install_icon_.reset(new SkBitmap(install_icon));
 448
 449   if (original_manifest)
 450     original_manifest_.reset(new Manifest(
 451         Manifest::INVALID_LOCATION,
 452         scoped_ptr<base::DictionaryValue>(original_manifest->DeepCopy())));
 453
 454   // We don't have to delete the unpack dir explicity since it is a child of
 455   // the temp dir.
 456   unpacked_extension_root_ = extension_dir;
 457
 458   CrxInstallError error = AllowInstall(extension);
 459   if (error.type() != CrxInstallError::ERROR_NONE) {
 460     ReportFailureFromFileThread(error);
 461     return;
 462   }
 463
 464   if (!BrowserThread::PostTask(BrowserThread::UI,
 465                                FROM_HERE,
 466                                base::Bind(&CrxInstaller::CheckInstall, this)))
 467     NOTREACHED();
 468 }
 469
 470 void CrxInstaller::CheckInstall() {
 471   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 472   ExtensionService* service = service_weak_.get();
 473   if (!service || service->browser_terminating())
 474     return;
 475
 476   // TODO(crbug.com/420147): Move this code to a utility class to avoid
 477   // duplication of SharedModuleService::CheckImports code.
 478   if (SharedModuleInfo::ImportsModules(extension())) {
 479     const std::vector<SharedModuleInfo::ImportInfo>& imports =
 480         SharedModuleInfo::GetImports(extension());
 481     std::vector<SharedModuleInfo::ImportInfo>::const_iterator i;
 482     for (i = imports.begin(); i != imports.end(); ++i) {
 483       Version version_required(i->minimum_version);
 484       const Extension* imported_module =
 485           service->GetExtensionById(i->extension_id, true);
 486       if (imported_module &&
 487           !SharedModuleInfo::IsSharedModule(imported_module)) {
 488         ReportFailureFromUIThread(CrxInstallError(
 489             CrxInstallError::ERROR_DECLINED,
 490             l10n_util::GetStringFUTF16(
 491                 IDS_EXTENSION_INSTALL_DEPENDENCY_NOT_SHARED_MODULE,
 492                 base::UTF8ToUTF16(imported_module->name()))));
 493         return;
 494       } else if (imported_module && (version_required.IsValid() &&
 495                                      imported_module->version()->CompareTo(
 496                                          version_required) < 0)) {
 497         ReportFailureFromUIThread(CrxInstallError(
 498             CrxInstallError::ERROR_DECLINED,
 499             l10n_util::GetStringFUTF16(
 500                 IDS_EXTENSION_INSTALL_DEPENDENCY_OLD_VERSION,
 501                 base::UTF8ToUTF16(imported_module->name()),
 502                 base::ASCIIToUTF16(i->minimum_version),
 503                 base::ASCIIToUTF16(imported_module->version()->GetString()))));
 504         return;
 505       } else if (imported_module &&
 506                  !SharedModuleInfo::IsExportAllowedByWhitelist(
 507                      imported_module, extension()->id())) {
 508         ReportFailureFromUIThread(CrxInstallError(
 509             CrxInstallError::ERROR_DECLINED,
 510             l10n_util::GetStringFUTF16(
 511                 IDS_EXTENSION_INSTALL_DEPENDENCY_NOT_WHITELISTED,
 512                 base::UTF8ToUTF16(extension()->name()),
 513                 base::UTF8ToUTF16(imported_module->name()))));
 514         return;
 515       }
 516     }
 517   }
 518
 519   // Run the policy, requirements and blacklist checks in parallel.
 520   install_checker_.Start(
 521       ExtensionInstallChecker::CHECK_ALL,
 522       false /* fail fast */,
 523       base::Bind(&CrxInstaller::OnInstallChecksComplete, this));
 524 }
 525
 526 void CrxInstaller::OnInstallChecksComplete(int failed_checks) {
 527   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 528   if (!service_weak_)
 529     return;
 530
 531   // Check for requirement errors.
 532   if (!install_checker_.requirement_errors().empty()) {
 533     if (error_on_unsupported_requirements_) {
 534       ReportFailureFromUIThread(
 535           CrxInstallError(CrxInstallError::ERROR_DECLINED,
 536                           base::UTF8ToUTF16(base::JoinString(
 537                               install_checker_.requirement_errors(), " "))));
 538       return;
 539     }
 540     install_flags_ |= kInstallFlagHasRequirementErrors;
 541   }
 542
 543   // Check the blacklist state.
 544   if (install_checker_.blacklist_state() == extensions::BLACKLISTED_MALWARE) {
 545     install_flags_ |= kInstallFlagIsBlacklistedForMalware;
 546   }
 547
 548   if ((install_checker_.blacklist_state() == extensions::BLACKLISTED_MALWARE ||
 549        install_checker_.blacklist_state() == extensions::BLACKLISTED_UNKNOWN) &&
 550       !allow_silent_install_) {
 551     // User tried to install a blacklisted extension. Show an error and
 552     // refuse to install it.
 553     ReportFailureFromUIThread(extensions::CrxInstallError(
 554         CrxInstallError::ERROR_DECLINED,
 555         l10n_util::GetStringFUTF16(IDS_EXTENSION_IS_BLACKLISTED,
 556                                    base::UTF8ToUTF16(extension()->name()))));
 557     UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.BlockCRX",
 558                               extension()->location(),
 559                               Manifest::NUM_LOCATIONS);
 560     return;
 561   }
 562
 563   // NOTE: extension may still be blacklisted, but we're forced to silently
 564   // install it. In this case, ExtensionService::OnExtensionInstalled needs to
 565   // deal with it.
 566
 567   // Check for policy errors.
 568   if (!install_checker_.policy_error().empty()) {
 569     // We don't want to show the error infobar for installs from the WebStore,
 570     // because the WebStore already shows an error dialog itself.
 571     // Note: |client_| can be NULL in unit_tests!
 572     if (extension()->from_webstore() && client_)
 573       client_->install_ui()->SetSkipPostInstallUI(true);
 574     ReportFailureFromUIThread(
 575         CrxInstallError(CrxInstallError::ERROR_DECLINED,
 576                         base::UTF8ToUTF16(install_checker_.policy_error())));
 577     return;
 578   }
 579
 580   ConfirmInstall();
 581 }
 582
 583 void CrxInstaller::ConfirmInstall() {
 584   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 585   ExtensionService* service = service_weak_.get();
 586   if (!service || service->browser_terminating())
 587     return;
 588
 589   if (KioskModeInfo::IsKioskOnly(install_checker_.extension().get())) {
 590     bool in_kiosk_mode = false;
 591 #if defined(OS_CHROMEOS)
 592     user_manager::UserManager* user_manager = user_manager::UserManager::Get();
 593     in_kiosk_mode = user_manager && user_manager->IsLoggedInAsKioskApp();
 594 #endif
 595     if (!in_kiosk_mode) {
 596       ReportFailureFromUIThread(CrxInstallError(
 597           CrxInstallError::ERROR_DECLINED,
 598           l10n_util::GetStringUTF16(IDS_EXTENSION_INSTALL_KIOSK_MODE_ONLY)));
 599       return;
 600     }
 601   }
 602
 603   // Check whether this install is initiated from the settings page to
 604   // update an existing extension or app.
 605   CheckUpdateFromSettingsPage();
 606
 607   GURL overlapping_url;
 608   ExtensionRegistry* registry = ExtensionRegistry::Get(service->profile());
 609   const Extension* overlapping_extension =
 610       registry->enabled_extensions().GetHostedAppByOverlappingWebExtent(
 611           extension()->web_extent());
 612   if (overlapping_extension &&
 613       overlapping_extension->id() != extension()->id()) {
 614     ReportFailureFromUIThread(CrxInstallError(l10n_util::GetStringFUTF16(
 615         IDS_EXTENSION_OVERLAPPING_WEB_EXTENT,
 616         base::UTF8ToUTF16(overlapping_extension->name()))));
 617     return;
 618   }
 619
 620   current_version_ = ExtensionPrefs::Get(service->profile())
 621                          ->GetVersionString(extension()->id());
 622
 623   if (client_ &&
 624       (!allow_silent_install_ || !approved_) &&
 625       !update_from_settings_page_) {
 626     AddRef();  // Balanced in InstallUIProceed() and InstallUIAbort().
 627     client_->ConfirmInstall(this, extension(), show_dialog_callback_);
 628   } else {
 629     if (!installer_task_runner_->PostTask(
 630             FROM_HERE,
 631             base::Bind(&CrxInstaller::CompleteInstall, this)))
 632       NOTREACHED();
 633   }
 634   return;
 635 }
 636
 637 void CrxInstaller::InstallUIProceed() {
 638   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 639
 640   ExtensionService* service = service_weak_.get();
 641   if (!service || service->browser_terminating())
 642     return;
 643
 644   // If update_from_settings_page_ boolean is true, this functions is
 645   // getting called in response to ExtensionInstallPrompt::ConfirmReEnable()
 646   // and if it is false, this function is called in response to
 647   // ExtensionInstallPrompt::ConfirmInstall().
 648   if (update_from_settings_page_) {
 649     service->GrantPermissionsAndEnableExtension(extension());
 650   } else {
 651     if (!installer_task_runner_->PostTask(
 652             FROM_HERE,
 653             base::Bind(&CrxInstaller::CompleteInstall, this)))
 654       NOTREACHED();
 655   }
 656
 657   Release();  // balanced in ConfirmInstall() or ConfirmReEnable().
 658 }
 659
 660 void CrxInstaller::InstallUIAbort(bool user_initiated) {
 661   // If update_from_settings_page_ boolean is true, this functions is
 662   // getting called in response to ExtensionInstallPrompt::ConfirmReEnable()
 663   // and if it is false, this function is called in response to
 664   // ExtensionInstallPrompt::ConfirmInstall().
 665   if (!update_from_settings_page_) {
 666     const char* histogram_name = user_initiated ? "InstallCancel"
 667                                                 : "InstallAbort";
 668     ExtensionService::RecordPermissionMessagesHistogram(
 669         extension(), histogram_name);
 670
 671     NotifyCrxInstallComplete(false);
 672   }
 673
 674   Release();  // balanced in ConfirmInstall() or ConfirmReEnable().
 675
 676   // We're done. Since we don't post any more tasks to ourself, our ref count
 677   // should go to zero and we die. The destructor will clean up the temp dir.
 678 }
 679
 680 void CrxInstaller::CompleteInstall() {
 681   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 682
 683   if (!current_version_.empty()) {
 684     Version current_version(current_version_);
 685     if (current_version.CompareTo(*(extension()->version())) > 0) {
 686       ReportFailureFromFileThread(CrxInstallError(
 687           CrxInstallError::ERROR_DECLINED,
 688           l10n_util::GetStringUTF16(
 689               extension()->is_app() ? IDS_APP_CANT_DOWNGRADE_VERSION
 690                                     : IDS_EXTENSION_CANT_DOWNGRADE_VERSION)));
 691       return;
 692     }
 693   }
 694
 695   // See how long extension install paths are.  This is important on
 696   // windows, because file operations may fail if the path to a file
 697   // exceeds a small constant.  See crbug.com/69693 .
 698   UMA_HISTOGRAM_CUSTOM_COUNTS(
 699     "Extensions.CrxInstallDirPathLength",
 700         install_directory_.value().length(), 0, 500, 100);
 701
 702   ExtensionAssetsManager* assets_manager =
 703       ExtensionAssetsManager::GetInstance();
 704   assets_manager->InstallExtension(
 705       extension(),
 706       unpacked_extension_root_,
 707       install_directory_,
 708       profile(),
 709       base::Bind(&CrxInstaller::ReloadExtensionAfterInstall, this));
 710 }
 711
 712 void CrxInstaller::ReloadExtensionAfterInstall(
 713     const base::FilePath& version_dir) {
 714   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 715
 716   if (version_dir.empty()) {
 717     ReportFailureFromFileThread(CrxInstallError(l10n_util::GetStringUTF16(
 718         IDS_EXTENSION_MOVE_DIRECTORY_TO_PROFILE_FAILED)));
 719     return;
 720   }
 721
 722   // This is lame, but we must reload the extension because absolute paths
 723   // inside the content scripts are established inside InitFromValue() and we
 724   // just moved the extension.
 725   // TODO(aa): All paths to resources inside extensions should be created
 726   // lazily and based on the Extension's root path at that moment.
 727   // TODO(rdevlin.cronin): Continue removing std::string errors and replacing
 728   // with base::string16
 729   std::string extension_id = extension()->id();
 730   std::string error;
 731   install_checker_.set_extension(
 732       file_util::LoadExtension(
 733           version_dir,
 734           install_source_,
 735           extension()->creation_flags() | Extension::REQUIRE_KEY,
 736           &error).get());
 737
 738   if (extension()) {
 739     ReportSuccessFromFileThread();
 740   } else {
 741     LOG(ERROR) << error << " " << extension_id << " " << download_url_;
 742     ReportFailureFromFileThread(CrxInstallError(base::UTF8ToUTF16(error)));
 743   }
 744 }
 745
 746 void CrxInstaller::ReportFailureFromFileThread(const CrxInstallError& error) {
 747   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 748   if (!BrowserThread::PostTask(
 749           BrowserThread::UI, FROM_HERE,
 750           base::Bind(&CrxInstaller::ReportFailureFromUIThread, this, error))) {
 751     NOTREACHED();
 752   }
 753 }
 754
 755 void CrxInstaller::ReportFailureFromUIThread(const CrxInstallError& error) {
 756   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 757
 758   if (!service_weak_.get() || service_weak_->browser_terminating())
 759     return;
 760
 761   content::NotificationService* service =
 762       content::NotificationService::current();
 763   service->Notify(extensions::NOTIFICATION_EXTENSION_INSTALL_ERROR,
 764                   content::Source<CrxInstaller>(this),
 765                   content::Details<const extensions::CrxInstallError>(&error));
 766
 767   // This isn't really necessary, it is only used because unit tests expect to
 768   // see errors get reported via this interface.
 769   //
 770   // TODO(aa): Need to go through unit tests and clean them up too, probably get
 771   // rid of this line.
 772   ExtensionErrorReporter::GetInstance()->ReportError(
 773       error.message(),
 774       false);  // Be quiet.
 775
 776   if (client_)
 777     client_->OnInstallFailure(error);
 778
 779   NotifyCrxInstallComplete(false);
 780
 781   // Delete temporary files.
 782   CleanupTempFiles();
 783 }
 784
 785 void CrxInstaller::ReportSuccessFromFileThread() {
 786   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 787
 788   // Tracking number of extensions installed by users
 789   if (install_cause() == extension_misc::INSTALL_CAUSE_USER_DOWNLOAD)
 790     UMA_HISTOGRAM_ENUMERATION("Extensions.ExtensionInstalled", 1, 2);
 791
 792   if (!BrowserThread::PostTask(
 793           BrowserThread::UI, FROM_HERE,
 794           base::Bind(&CrxInstaller::ReportSuccessFromUIThread, this)))
 795     NOTREACHED();
 796
 797   // Delete temporary files.
 798   CleanupTempFiles();
 799 }
 800
 801 void CrxInstaller::ReportSuccessFromUIThread() {
 802   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 803
 804   if (!service_weak_.get() || service_weak_->browser_terminating())
 805     return;
 806
 807   if (!update_from_settings_page_) {
 808     // If there is a client, tell the client about installation.
 809     if (client_)
 810       client_->OnInstallSuccess(extension(), install_icon_.get());
 811
 812     // We update the extension's granted permissions if the user already
 813     // approved the install (client_ is non NULL), or we are allowed to install
 814     // this silently.
 815     if ((client_ || allow_silent_install_) && grant_permissions_) {
 816       PermissionsUpdater perms_updater(profile());
 817       perms_updater.InitializePermissions(extension());
 818       perms_updater.GrantActivePermissions(extension());
 819     }
 820   }
 821
 822   service_weak_->OnExtensionInstalled(
 823       extension(), page_ordinal_, install_flags_);
 824   NotifyCrxInstallComplete(true);
 825 }
 826
 827 void CrxInstaller::NotifyCrxInstallBegin() {
 828   InstallTrackerFactory::GetForBrowserContext(profile())
 829       ->OnBeginCrxInstall(expected_id_);
 830 }
 831
 832 void CrxInstaller::NotifyCrxInstallComplete(bool success) {
 833   // Some users (such as the download shelf) need to know when a
 834   // CRXInstaller is done.  Listening for the EXTENSION_* events
 835   // is problematic because they don't know anything about the
 836   // extension before it is unpacked, so they cannot filter based
 837   // on the extension.
 838   content::NotificationService::current()->Notify(
 839       extensions::NOTIFICATION_CRX_INSTALLER_DONE,
 840       content::Source<CrxInstaller>(this),
 841       content::Details<const Extension>(success ? extension() : NULL));
 842
 843   InstallTrackerFactory::GetForBrowserContext(profile())
 844       ->OnFinishCrxInstall(success ? extension()->id() : expected_id_, success);
 845
 846   if (success)
 847     ConfirmReEnable();
 848 }
 849
 850 void CrxInstaller::CleanupTempFiles() {
 851   if (!installer_task_runner_->RunsTasksOnCurrentThread()) {
 852     if (!installer_task_runner_->PostTask(
 853             FROM_HERE,
 854             base::Bind(&CrxInstaller::CleanupTempFiles, this))) {
 855       NOTREACHED();
 856     }
 857     return;
 858   }
 859
 860   // Delete the temp directory and crx file as necessary.
 861   if (!temp_dir_.value().empty()) {
 862     file_util::DeleteFile(temp_dir_, true);
 863     temp_dir_ = base::FilePath();
 864   }
 865
 866   if (delete_source_ && !source_file_.value().empty()) {
 867     file_util::DeleteFile(source_file_, false);
 868     source_file_ = base::FilePath();
 869   }
 870 }
 871
 872 void CrxInstaller::CheckUpdateFromSettingsPage() {
 873   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 874
 875   ExtensionService* service = service_weak_.get();
 876   if (!service || service->browser_terminating())
 877     return;
 878
 879   if (off_store_install_allow_reason_ != OffStoreInstallAllowedFromSettingsPage)
 880     return;
 881
 882   const Extension* installed_extension =
 883       service->GetInstalledExtension(extension()->id());
 884   if (installed_extension) {
 885     // Previous version of the extension exists.
 886     update_from_settings_page_ = true;
 887     expected_id_ = installed_extension->id();
 888     install_source_ = installed_extension->location();
 889     install_cause_ = extension_misc::INSTALL_CAUSE_UPDATE;
 890   }
 891 }
 892
 893 void CrxInstaller::ConfirmReEnable() {
 894   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 895
 896   ExtensionService* service = service_weak_.get();
 897   if (!service || service->browser_terminating())
 898     return;
 899
 900   if (!update_from_settings_page_)
 901     return;
 902
 903   ExtensionPrefs* prefs = ExtensionPrefs::Get(service->profile());
 904   if (!prefs->DidExtensionEscalatePermissions(extension()->id()))
 905     return;
 906
 907   if (client_) {
 908     AddRef();  // Balanced in InstallUIProceed() and InstallUIAbort().
 909     client_->ConfirmReEnable(this, extension());
 910   }
 911 }
 912
 913 }  // namespace extensions