chrome/installer/util/google_update_settings.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/installer/util/google_update_settings.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/command_line.h"
  10 #include "base/files/file_path.h"
  11 #include "base/logging.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/path_service.h"
  14 #include "base/strings/string_number_conversions.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/threading/thread_restrictions.h"
  18 #include "base/time/time.h"
  19 #include "base/win/registry.h"
  20 #include "base/win/win_util.h"
  21 #include "chrome/common/chrome_switches.h"
  22 #include "chrome/installer/util/app_registration_data.h"
  23 #include "chrome/installer/util/browser_distribution.h"
  24 #include "chrome/installer/util/channel_info.h"
  25 #include "chrome/installer/util/google_update_constants.h"
  26 #include "chrome/installer/util/google_update_experiment_util.h"
  27 #include "chrome/installer/util/install_util.h"
  28 #include "chrome/installer/util/installation_state.h"
  29 #include "chrome/installer/util/product.h"
  30
  31 using base::win::RegKey;
  32 using installer::InstallationState;
  33
  34 const wchar_t GoogleUpdateSettings::kPoliciesKey[] =
  35     L"SOFTWARE\\Policies\\Google\\Update";
  36 const wchar_t GoogleUpdateSettings::kUpdatePolicyValue[] = L"UpdateDefault";
  37 const wchar_t GoogleUpdateSettings::kUpdateOverrideValuePrefix[] = L"Update";
  38 const wchar_t GoogleUpdateSettings::kCheckPeriodOverrideMinutes[] =
  39     L"AutoUpdateCheckPeriodMinutes";
  40
  41 // Don't allow update periods longer than six weeks.
  42 const int GoogleUpdateSettings::kCheckPeriodOverrideMinutesMax =
  43     60 * 24 * 7 * 6;
  44
  45 const GoogleUpdateSettings::UpdatePolicy
  46 GoogleUpdateSettings::kDefaultUpdatePolicy =
  47 #if defined(GOOGLE_CHROME_BUILD)
  48     GoogleUpdateSettings::AUTOMATIC_UPDATES;
  49 #else
  50     GoogleUpdateSettings::UPDATES_DISABLED;
  51 #endif
  52
  53 namespace {
  54
  55 bool ReadGoogleUpdateStrKey(const wchar_t* const name, base::string16* value) {
  56   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
  57   base::string16 reg_path = dist->GetStateKey();
  58   RegKey key(HKEY_CURRENT_USER, reg_path.c_str(), KEY_READ | KEY_WOW64_32KEY);
  59   if (key.ReadValue(name, value) != ERROR_SUCCESS) {
  60     RegKey hklm_key(
  61         HKEY_LOCAL_MACHINE, reg_path.c_str(), KEY_READ | KEY_WOW64_32KEY);
  62     return (hklm_key.ReadValue(name, value) == ERROR_SUCCESS);
  63   }
  64   return true;
  65 }
  66
  67 // Writes |value| into a user-specific value in the key |name| under
  68 // |app_reg_data|'s ClientStateMedium key in HKLM along with the aggregation
  69 // method |aggregate|. This function is solely for use by system-level installs.
  70 bool WriteGoogleUpdateAggregateNumKeyInternal(
  71     const AppRegistrationData& app_reg_data,
  72     const wchar_t* const name,
  73     int value,
  74     const wchar_t* const aggregate) {
  75   DCHECK(aggregate);
  76   DCHECK(GoogleUpdateSettings::IsSystemInstall());
  77   const REGSAM kAccess = KEY_SET_VALUE | KEY_WOW64_32KEY;
  78
  79   // Machine installs require each OS user to write a unique key under a
  80   // named key in HKLM as well as an "aggregation" function that describes
  81   // how the values of multiple users are to be combined.
  82   base::string16 uniquename;
  83   if (!base::win::GetUserSidString(&uniquename)) {
  84     NOTREACHED();
  85     return false;
  86   }
  87
  88   base::string16 reg_path(app_reg_data.GetStateMediumKey());
  89   reg_path.append(L"\\");
  90   reg_path.append(name);
  91   RegKey key(HKEY_LOCAL_MACHINE, reg_path.c_str(), kAccess);
  92   key.WriteValue(google_update::kRegAggregateMethod, aggregate);
  93   return (key.WriteValue(uniquename.c_str(), value) == ERROR_SUCCESS);
  94 }
  95
  96 // Updates a registry key |name| to be |value| for the given |app_reg_data|.
  97 bool WriteGoogleUpdateStrKeyInternal(const AppRegistrationData& app_reg_data,
  98                                      const wchar_t* const name,
  99                                      const base::string16& value) {
 100   const REGSAM kAccess = KEY_SET_VALUE | KEY_WOW64_32KEY;
 101   RegKey key(HKEY_CURRENT_USER, app_reg_data.GetStateKey().c_str(), kAccess);
 102   return (key.WriteValue(name, value.c_str()) == ERROR_SUCCESS);
 103 }
 104
 105 bool WriteGoogleUpdateStrKey(const wchar_t* const name,
 106                              const base::string16& value) {
 107   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 108   return WriteGoogleUpdateStrKeyInternal(
 109       dist->GetAppRegistrationData(), name, value);
 110 }
 111
 112 bool ClearGoogleUpdateStrKey(const wchar_t* const name) {
 113   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 114   base::string16 reg_path = dist->GetStateKey();
 115   RegKey key(HKEY_CURRENT_USER,
 116              reg_path.c_str(),
 117              KEY_READ | KEY_WRITE | KEY_WOW64_32KEY);
 118   base::string16 value;
 119   if (key.ReadValue(name, &value) != ERROR_SUCCESS)
 120     return false;
 121   return (key.WriteValue(name, L"") == ERROR_SUCCESS);
 122 }
 123
 124 bool RemoveGoogleUpdateStrKey(const wchar_t* const name) {
 125   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 126   base::string16 reg_path = dist->GetStateKey();
 127   RegKey key(HKEY_CURRENT_USER,
 128              reg_path.c_str(),
 129              KEY_READ | KEY_WRITE | KEY_WOW64_32KEY);
 130   if (!key.HasValue(name))
 131     return true;
 132   return (key.DeleteValue(name) == ERROR_SUCCESS);
 133 }
 134
 135 bool GetChromeChannelInternal(bool system_install,
 136                               bool add_multi_modifier,
 137                               base::string16* channel) {
 138   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 139
 140   // Shortcut in case this distribution knows what channel it is (canary).
 141   if (dist->GetChromeChannel(channel))
 142     return true;
 143
 144   // Determine whether or not chrome is multi-install. If so, updates are
 145   // delivered under the binaries' app guid, so that's where the relevant
 146   // channel is found.
 147   installer::ProductState state;
 148   installer::ChannelInfo channel_info;
 149   ignore_result(state.Initialize(system_install, dist));
 150   if (!state.is_multi_install()) {
 151     // Use the channel info that was just read for this single-install chrome.
 152     channel_info = state.channel();
 153   } else {
 154     // Read the channel info from the binaries' state key.
 155     HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 156     dist = BrowserDistribution::GetSpecificDistribution(
 157         BrowserDistribution::CHROME_BINARIES);
 158     RegKey key(root_key, dist->GetStateKey().c_str(),
 159                KEY_READ | KEY_WOW64_32KEY);
 160
 161     if (!channel_info.Initialize(key)) {
 162       channel->assign(installer::kChromeChannelUnknown);
 163       return false;
 164     }
 165   }
 166
 167   if (!channel_info.GetChannelName(channel))
 168     channel->assign(installer::kChromeChannelUnknown);
 169
 170   // Tag the channel name if this is a multi-install.
 171   if (add_multi_modifier && state.is_multi_install()) {
 172     if (!channel->empty())
 173       channel->push_back(L'-');
 174     channel->push_back(L'm');
 175   }
 176
 177   return true;
 178 }
 179
 180 // Populates |update_policy| with the UpdatePolicy enum value corresponding to a
 181 // DWORD read from the registry and returns true if |value| is within range.
 182 // If |value| is out of range, returns false without modifying |update_policy|.
 183 bool GetUpdatePolicyFromDword(
 184     const DWORD value,
 185     GoogleUpdateSettings::UpdatePolicy* update_policy) {
 186   switch (value) {
 187     case GoogleUpdateSettings::UPDATES_DISABLED:
 188     case GoogleUpdateSettings::AUTOMATIC_UPDATES:
 189     case GoogleUpdateSettings::MANUAL_UPDATES_ONLY:
 190     case GoogleUpdateSettings::AUTO_UPDATES_ONLY:
 191       *update_policy = static_cast<GoogleUpdateSettings::UpdatePolicy>(value);
 192       return true;
 193     default:
 194       LOG(WARNING) << "Unexpected update policy override value: " << value;
 195   }
 196   return false;
 197 }
 198
 199 // Convenience routine: GoogleUpdateSettings::UpdateDidRunStateForApp()
 200 // specialized for Chrome Binaries.
 201 bool UpdateDidRunStateForBinaries(bool did_run) {
 202   BrowserDistribution* dist = BrowserDistribution::GetSpecificDistribution(
 203       BrowserDistribution::CHROME_BINARIES);
 204   return GoogleUpdateSettings::UpdateDidRunStateForApp(
 205       dist->GetAppRegistrationData(), did_run);
 206 }
 207
 208 }  // namespace
 209
 210 bool GoogleUpdateSettings::IsSystemInstall() {
 211   bool system_install = false;
 212   base::FilePath module_dir;
 213   if (!PathService::Get(base::DIR_MODULE, &module_dir)) {
 214     LOG(WARNING)
 215         << "Failed to get directory of module; assuming per-user install.";
 216   } else {
 217     system_install = !InstallUtil::IsPerUserInstall(module_dir);
 218   }
 219   return system_install;
 220 }
 221
 222 bool GoogleUpdateSettings::GetCollectStatsConsent() {
 223   return GetCollectStatsConsentAtLevel(IsSystemInstall());
 224 }
 225
 226 // Older versions of Chrome unconditionally read from HKCU\...\ClientState\...
 227 // and then HKLM\...\ClientState\....  This means that system-level Chrome
 228 // never checked ClientStateMedium (which has priority according to Google
 229 // Update) and gave preference to a value in HKCU (which was never checked by
 230 // Google Update).  From now on, Chrome follows Google Update's policy.
 231 bool GoogleUpdateSettings::GetCollectStatsConsentAtLevel(bool system_install) {
 232   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 233
 234   // Consent applies to all products in a multi-install package.
 235   if (InstallUtil::IsMultiInstall(dist, system_install)) {
 236     dist = BrowserDistribution::GetSpecificDistribution(
 237         BrowserDistribution::CHROME_BINARIES);
 238   }
 239
 240   RegKey key;
 241   DWORD value = 0;
 242   bool have_value = false;
 243   const REGSAM kAccess = KEY_QUERY_VALUE | KEY_WOW64_32KEY;
 244
 245   // For system-level installs, try ClientStateMedium first.
 246   have_value =
 247       system_install &&
 248       key.Open(HKEY_LOCAL_MACHINE, dist->GetStateMediumKey().c_str(),
 249                kAccess) == ERROR_SUCCESS &&
 250       key.ReadValueDW(google_update::kRegUsageStatsField,
 251                       &value) == ERROR_SUCCESS;
 252
 253   // Otherwise, try ClientState.
 254   if (!have_value) {
 255     have_value =
 256         key.Open(system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER,
 257                  dist->GetStateKey().c_str(),
 258                  kAccess) == ERROR_SUCCESS &&
 259         key.ReadValueDW(google_update::kRegUsageStatsField,
 260                         &value) == ERROR_SUCCESS;
 261   }
 262
 263   // Google Update specifically checks that the value is 1, so we do the same.
 264   return have_value && value == 1;
 265 }
 266
 267 bool GoogleUpdateSettings::SetCollectStatsConsent(bool consented) {
 268   return SetCollectStatsConsentAtLevel(IsSystemInstall(), consented);
 269 }
 270
 271 bool GoogleUpdateSettings::SetCollectStatsConsentAtLevel(bool system_install,
 272                                                          bool consented) {
 273   // Google Update writes and expects 1 for true, 0 for false.
 274   DWORD value = consented ? 1 : 0;
 275
 276   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 277
 278   // Consent applies to all products in a multi-install package.
 279   if (InstallUtil::IsMultiInstall(dist, system_install)) {
 280     dist = BrowserDistribution::GetSpecificDistribution(
 281         BrowserDistribution::CHROME_BINARIES);
 282   }
 283
 284   // Write to ClientStateMedium for system-level; ClientState otherwise.
 285   HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 286   base::string16 reg_path =
 287       system_install ? dist->GetStateMediumKey() : dist->GetStateKey();
 288   RegKey key;
 289   LONG result = key.Create(
 290       root_key, reg_path.c_str(), KEY_SET_VALUE | KEY_WOW64_32KEY);
 291   if (result != ERROR_SUCCESS) {
 292     LOG(ERROR) << "Failed opening key " << reg_path << " to set "
 293                << google_update::kRegUsageStatsField << "; result: " << result;
 294   } else {
 295     result = key.WriteValue(google_update::kRegUsageStatsField, value);
 296     LOG_IF(ERROR, result != ERROR_SUCCESS) << "Failed setting "
 297         << google_update::kRegUsageStatsField << " in key " << reg_path
 298         << "; result: " << result;
 299   }
 300   return (result == ERROR_SUCCESS);
 301 }
 302
 303 scoped_ptr<metrics::ClientInfo> GoogleUpdateSettings::LoadMetricsClientInfo() {
 304   base::string16 client_id_16;
 305   if (!ReadGoogleUpdateStrKey(google_update::kRegMetricsId, &client_id_16) ||
 306       client_id_16.empty()) {
 307     return scoped_ptr<metrics::ClientInfo>();
 308   }
 309
 310   scoped_ptr<metrics::ClientInfo> client_info(new metrics::ClientInfo);
 311   client_info->client_id = base::UTF16ToUTF8(client_id_16);
 312
 313   base::string16 installation_date_str;
 314   if (ReadGoogleUpdateStrKey(google_update::kRegMetricsIdInstallDate,
 315                              &installation_date_str)) {
 316     base::StringToInt64(installation_date_str, &client_info->installation_date);
 317   }
 318
 319   base::string16 reporting_enbaled_date_date_str;
 320   if (ReadGoogleUpdateStrKey(google_update::kRegMetricsIdEnabledDate,
 321                              &reporting_enbaled_date_date_str)) {
 322     base::StringToInt64(reporting_enbaled_date_date_str,
 323                         &client_info->reporting_enabled_date);
 324   }
 325
 326   return client_info.Pass();
 327 }
 328
 329 void GoogleUpdateSettings::StoreMetricsClientInfo(
 330     const metrics::ClientInfo& client_info) {
 331   // Attempt a best-effort at backing |client_info| in the registry (but don't
 332   // handle/report failures).
 333   WriteGoogleUpdateStrKey(google_update::kRegMetricsId,
 334                           base::UTF8ToUTF16(client_info.client_id));
 335   WriteGoogleUpdateStrKey(google_update::kRegMetricsIdInstallDate,
 336                           base::Int64ToString16(client_info.installation_date));
 337   WriteGoogleUpdateStrKey(
 338       google_update::kRegMetricsIdEnabledDate,
 339       base::Int64ToString16(client_info.reporting_enabled_date));
 340 }
 341
 342 // EULA consent is only relevant for system-level installs.
 343 bool GoogleUpdateSettings::SetEULAConsent(
 344     const InstallationState& machine_state,
 345     BrowserDistribution* dist,
 346     bool consented) {
 347   DCHECK(dist);
 348   const DWORD eula_accepted = consented ? 1 : 0;
 349   const REGSAM kAccess = KEY_SET_VALUE | KEY_WOW64_32KEY;
 350   base::string16 reg_path = dist->GetStateMediumKey();
 351   bool succeeded = true;
 352   RegKey key;
 353
 354   // Write the consent value into the product's ClientStateMedium key.
 355   if (key.Create(HKEY_LOCAL_MACHINE, reg_path.c_str(),
 356                  kAccess) != ERROR_SUCCESS ||
 357       key.WriteValue(google_update::kRegEULAAceptedField,
 358                      eula_accepted) != ERROR_SUCCESS) {
 359     succeeded = false;
 360   }
 361
 362   // If this is a multi-install, also write it into the binaries' key.
 363   // --mutli-install is not provided on the command-line, so deduce it from
 364   // the product's state.
 365   const installer::ProductState* product_state =
 366       machine_state.GetProductState(true, dist->GetType());
 367   if (product_state != NULL && product_state->is_multi_install()) {
 368     dist = BrowserDistribution::GetSpecificDistribution(
 369         BrowserDistribution::CHROME_BINARIES);
 370     reg_path = dist->GetStateMediumKey();
 371     if (key.Create(HKEY_LOCAL_MACHINE, reg_path.c_str(),
 372                    kAccess) != ERROR_SUCCESS ||
 373         key.WriteValue(google_update::kRegEULAAceptedField,
 374                        eula_accepted) != ERROR_SUCCESS) {
 375         succeeded = false;
 376     }
 377   }
 378
 379   return succeeded;
 380 }
 381
 382 int GoogleUpdateSettings::GetLastRunTime() {
 383   base::string16 time_s;
 384   if (!ReadGoogleUpdateStrKey(google_update::kRegLastRunTimeField, &time_s))
 385     return -1;
 386   int64 time_i;
 387   if (!base::StringToInt64(time_s, &time_i))
 388     return -1;
 389   base::TimeDelta td =
 390       base::Time::NowFromSystemTime() - base::Time::FromInternalValue(time_i);
 391   return td.InDays();
 392 }
 393
 394 bool GoogleUpdateSettings::SetLastRunTime() {
 395   int64 time = base::Time::NowFromSystemTime().ToInternalValue();
 396   return WriteGoogleUpdateStrKey(google_update::kRegLastRunTimeField,
 397                                  base::Int64ToString16(time));
 398 }
 399
 400 bool GoogleUpdateSettings::RemoveLastRunTime() {
 401   return RemoveGoogleUpdateStrKey(google_update::kRegLastRunTimeField);
 402 }
 403
 404 bool GoogleUpdateSettings::GetBrowser(base::string16* browser) {
 405   return ReadGoogleUpdateStrKey(google_update::kRegBrowserField, browser);
 406 }
 407
 408 bool GoogleUpdateSettings::GetLanguage(base::string16* language) {
 409   return ReadGoogleUpdateStrKey(google_update::kRegLangField, language);
 410 }
 411
 412 bool GoogleUpdateSettings::GetBrand(base::string16* brand) {
 413   return ReadGoogleUpdateStrKey(google_update::kRegRLZBrandField, brand);
 414 }
 415
 416 bool GoogleUpdateSettings::GetReactivationBrand(base::string16* brand) {
 417   return ReadGoogleUpdateStrKey(google_update::kRegRLZReactivationBrandField,
 418                                 brand);
 419 }
 420
 421 bool GoogleUpdateSettings::GetClient(base::string16* client) {
 422   return ReadGoogleUpdateStrKey(google_update::kRegClientField, client);
 423 }
 424
 425 bool GoogleUpdateSettings::SetClient(const base::string16& client) {
 426   return WriteGoogleUpdateStrKey(google_update::kRegClientField, client);
 427 }
 428
 429 bool GoogleUpdateSettings::GetReferral(base::string16* referral) {
 430   return ReadGoogleUpdateStrKey(google_update::kRegReferralField, referral);
 431 }
 432
 433 bool GoogleUpdateSettings::ClearReferral() {
 434   return ClearGoogleUpdateStrKey(google_update::kRegReferralField);
 435 }
 436
 437 bool GoogleUpdateSettings::UpdateDidRunStateForApp(
 438     const AppRegistrationData& app_reg_data,
 439     bool did_run) {
 440   return WriteGoogleUpdateStrKeyInternal(app_reg_data,
 441                                          google_update::kRegDidRunField,
 442                                          did_run ? L"1" : L"0");
 443 }
 444
 445 bool GoogleUpdateSettings::UpdateDidRunState(bool did_run, bool system_level) {
 446   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 447   bool result = UpdateDidRunStateForApp(dist->GetAppRegistrationData(),
 448                                         did_run);
 449   // Update state for binaries, even if the previous call was unsuccessful.
 450   if (InstallUtil::IsMultiInstall(dist, system_level))
 451     result = UpdateDidRunStateForBinaries(did_run) && result;
 452   return result;
 453 }
 454
 455 base::string16 GoogleUpdateSettings::GetChromeChannel(bool system_install) {
 456   base::string16 channel;
 457   GetChromeChannelInternal(system_install, false, &channel);
 458   return channel;
 459 }
 460
 461 bool GoogleUpdateSettings::GetChromeChannelAndModifiers(
 462     bool system_install,
 463     base::string16* channel) {
 464   return GetChromeChannelInternal(system_install, true, channel);
 465 }
 466
 467 void GoogleUpdateSettings::UpdateInstallStatus(bool system_install,
 468     installer::ArchiveType archive_type, int install_return_code,
 469     const base::string16& product_guid) {
 470   DCHECK(archive_type != installer::UNKNOWN_ARCHIVE_TYPE ||
 471          install_return_code != 0);
 472   HKEY reg_root = (system_install) ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 473
 474   RegKey key;
 475   installer::ChannelInfo channel_info;
 476   base::string16 reg_key(google_update::kRegPathClientState);
 477   reg_key.append(L"\\");
 478   reg_key.append(product_guid);
 479   LONG result = key.Open(reg_root,
 480                          reg_key.c_str(),
 481                          KEY_QUERY_VALUE | KEY_SET_VALUE | KEY_WOW64_32KEY);
 482   if (result == ERROR_SUCCESS)
 483     channel_info.Initialize(key);
 484   else if (result != ERROR_FILE_NOT_FOUND)
 485     LOG(ERROR) << "Failed to open " << reg_key << "; Error: " << result;
 486
 487   if (UpdateGoogleUpdateApKey(archive_type, install_return_code,
 488                               &channel_info)) {
 489     // We have a modified channel_info value to write.
 490     // Create the app's ClientState key if it doesn't already exist.
 491     if (!key.Valid()) {
 492       result = key.Open(reg_root,
 493                         google_update::kRegPathClientState,
 494                         KEY_CREATE_SUB_KEY | KEY_WOW64_32KEY);
 495       if (result == ERROR_SUCCESS)
 496         result = key.CreateKey(product_guid.c_str(),
 497                                KEY_SET_VALUE | KEY_WOW64_32KEY);
 498
 499       if (result != ERROR_SUCCESS) {
 500         LOG(ERROR) << "Failed to create " << reg_key << "; Error: " << result;
 501         return;
 502       }
 503     }
 504     if (!channel_info.Write(&key)) {
 505       LOG(ERROR) << "Failed to write to application's ClientState key "
 506                  << google_update::kRegApField << " = " << channel_info.value();
 507     }
 508   }
 509 }
 510
 511 bool GoogleUpdateSettings::UpdateGoogleUpdateApKey(
 512     installer::ArchiveType archive_type, int install_return_code,
 513     installer::ChannelInfo* value) {
 514   DCHECK(archive_type != installer::UNKNOWN_ARCHIVE_TYPE ||
 515          install_return_code != 0);
 516   bool modified = false;
 517
 518   if (archive_type == installer::FULL_ARCHIVE_TYPE || !install_return_code) {
 519     if (value->SetFullSuffix(false)) {
 520       VLOG(1) << "Removed incremental installer failure key; "
 521                  "switching to channel: "
 522               << value->value();
 523       modified = true;
 524     }
 525   } else if (archive_type == installer::INCREMENTAL_ARCHIVE_TYPE) {
 526     if (value->SetFullSuffix(true)) {
 527       VLOG(1) << "Incremental installer failed; switching to channel: "
 528               << value->value();
 529       modified = true;
 530     } else {
 531       VLOG(1) << "Incremental installer failure; already on channel: "
 532               << value->value();
 533     }
 534   } else {
 535     // It's okay if we don't know the archive type.  In this case, leave the
 536     // "-full" suffix as we found it.
 537     DCHECK_EQ(installer::UNKNOWN_ARCHIVE_TYPE, archive_type);
 538   }
 539
 540   if (value->SetMultiFailSuffix(false)) {
 541     VLOG(1) << "Removed multi-install failure key; switching to channel: "
 542             << value->value();
 543     modified = true;
 544   }
 545
 546   return modified;
 547 }
 548
 549 void GoogleUpdateSettings::UpdateProfileCounts(int profiles_active,
 550                                                int profiles_signedin) {
 551   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 552   // System-level installs must write into the ClientStateMedium key shared by
 553   // all users. Special treatment is used to aggregate across those users.
 554   if (IsSystemInstall()) {
 555     // Write the counts as ints that get aggregated across all users via
 556     // summation for system-level installs.
 557     WriteGoogleUpdateAggregateNumKeyInternal(
 558         dist->GetAppRegistrationData(),
 559         google_update::kRegProfilesActive,
 560         profiles_active,
 561         L"sum()");
 562     WriteGoogleUpdateAggregateNumKeyInternal(
 563         dist->GetAppRegistrationData(),
 564         google_update::kRegProfilesSignedIn,
 565         profiles_signedin,
 566         L"sum()");
 567   } else {
 568     // Write the counts as strings since no aggregation function is needed for
 569     // user-level installs.
 570     WriteGoogleUpdateStrKeyInternal(dist->GetAppRegistrationData(),
 571                                     google_update::kRegProfilesActive,
 572                                     base::IntToString16(profiles_active));
 573     WriteGoogleUpdateStrKeyInternal(dist->GetAppRegistrationData(),
 574                                     google_update::kRegProfilesSignedIn,
 575                                     base::IntToString16(profiles_signedin));
 576   }
 577 }
 578
 579 int GoogleUpdateSettings::DuplicateGoogleUpdateSystemClientKey() {
 580   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 581   base::string16 reg_path = dist->GetStateKey();
 582
 583   // Minimum access needed is to be able to write to this key.
 584   RegKey reg_key(
 585       HKEY_LOCAL_MACHINE, reg_path.c_str(), KEY_SET_VALUE | KEY_WOW64_32KEY);
 586   if (!reg_key.Valid())
 587     return 0;
 588
 589   HANDLE target_handle = 0;
 590   if (!DuplicateHandle(GetCurrentProcess(), reg_key.Handle(),
 591                        GetCurrentProcess(), &target_handle, KEY_SET_VALUE,
 592                        TRUE, DUPLICATE_SAME_ACCESS)) {
 593     return 0;
 594   }
 595   return reinterpret_cast<int>(target_handle);
 596 }
 597
 598 bool GoogleUpdateSettings::WriteGoogleUpdateSystemClientKey(
 599     int handle, const base::string16& key, const base::string16& value) {
 600   HKEY reg_key = reinterpret_cast<HKEY>(reinterpret_cast<void*>(handle));
 601   DWORD size = static_cast<DWORD>(value.size()) * sizeof(wchar_t);
 602   LSTATUS status = RegSetValueEx(reg_key, key.c_str(), 0, REG_SZ,
 603       reinterpret_cast<const BYTE*>(value.c_str()), size);
 604   return status == ERROR_SUCCESS;
 605 }
 606
 607 GoogleUpdateSettings::UpdatePolicy GoogleUpdateSettings::GetAppUpdatePolicy(
 608     const base::string16& app_guid,
 609     bool* is_overridden) {
 610   bool found_override = false;
 611   UpdatePolicy update_policy = kDefaultUpdatePolicy;
 612
 613 #if defined(GOOGLE_CHROME_BUILD)
 614   DCHECK(!app_guid.empty());
 615   RegKey policy_key;
 616
 617   // Google Update Group Policy settings are always in HKLM.
 618   // TODO(wfh): Check if policies should go into Wow6432Node or not.
 619   if (policy_key.Open(HKEY_LOCAL_MACHINE, kPoliciesKey, KEY_QUERY_VALUE) ==
 620           ERROR_SUCCESS) {
 621     DWORD value = 0;
 622     base::string16 app_update_override(kUpdateOverrideValuePrefix);
 623     app_update_override.append(app_guid);
 624     // First try to read and comprehend the app-specific override.
 625     found_override = (policy_key.ReadValueDW(app_update_override.c_str(),
 626                                              &value) == ERROR_SUCCESS &&
 627                       GetUpdatePolicyFromDword(value, &update_policy));
 628
 629     // Failing that, try to read and comprehend the default override.
 630     if (!found_override &&
 631         policy_key.ReadValueDW(kUpdatePolicyValue, &value) == ERROR_SUCCESS) {
 632       GetUpdatePolicyFromDword(value, &update_policy);
 633     }
 634   }
 635 #endif  // defined(GOOGLE_CHROME_BUILD)
 636
 637   if (is_overridden != NULL)
 638     *is_overridden = found_override;
 639
 640   return update_policy;
 641 }
 642
 643 // static
 644 bool GoogleUpdateSettings::AreAutoupdatesEnabled() {
 645 #if defined(GOOGLE_CHROME_BUILD)
 646   // Check the auto-update check period override. If it is 0 or exceeds the
 647   // maximum timeout, then for all intents and purposes auto updates are
 648   // disabled.
 649   RegKey policy_key;
 650   DWORD value = 0;
 651   if (policy_key.Open(HKEY_LOCAL_MACHINE, kPoliciesKey,
 652                       KEY_QUERY_VALUE) == ERROR_SUCCESS &&
 653       policy_key.ReadValueDW(kCheckPeriodOverrideMinutes,
 654                              &value) == ERROR_SUCCESS &&
 655       (value == 0 || value > kCheckPeriodOverrideMinutesMax)) {
 656     return false;
 657   }
 658
 659   // Auto updates are subtly broken when Chrome and the binaries have different
 660   // overrides in place. If this Chrome cannot possibly be multi-install by
 661   // virtue of being a side-by-side installation, simply check Chrome's policy.
 662   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 663   UpdatePolicy app_policy = GetAppUpdatePolicy(dist->GetAppGuid(), nullptr);
 664   if (InstallUtil::IsChromeSxSProcess())
 665     return app_policy == AUTOMATIC_UPDATES || app_policy == AUTO_UPDATES_ONLY;
 666
 667   // Otherwise, check for consistency between Chrome and the binaries regardless
 668   // of whether or not this Chrome is multi-install since the next update likely
 669   // will attempt to migrate it to such.
 670   BrowserDistribution* binaries = BrowserDistribution::GetSpecificDistribution(
 671       BrowserDistribution::CHROME_BINARIES);
 672   return (GetAppUpdatePolicy(binaries->GetAppGuid(), nullptr) == app_policy &&
 673           (app_policy == AUTOMATIC_UPDATES || app_policy == AUTO_UPDATES_ONLY));
 674 #else  // defined(GOOGLE_CHROME_BUILD)
 675   // Chromium does not auto update.
 676   return false;
 677 #endif  // !defined(GOOGLE_CHROME_BUILD)
 678 }
 679
 680 // static
 681 bool GoogleUpdateSettings::ReenableAutoupdates() {
 682 #if defined(GOOGLE_CHROME_BUILD)
 683   int needs_reset_count = 0;
 684   int did_reset_count = 0;
 685
 686   // Reset overrides for Chrome and for the binaries if this Chrome supports
 687   // multi-install.
 688   std::vector<base::string16> app_guids;
 689   app_guids.push_back(BrowserDistribution::GetDistribution()->GetAppGuid());
 690   if (!InstallUtil::IsChromeSxSProcess()) {
 691     app_guids.push_back(BrowserDistribution::GetSpecificDistribution(
 692         BrowserDistribution::CHROME_BINARIES)->GetAppGuid());
 693   }
 694
 695   UpdatePolicy update_policy = kDefaultUpdatePolicy;
 696   RegKey policy_key;
 697   if (policy_key.Open(HKEY_LOCAL_MACHINE, kPoliciesKey,
 698                       KEY_SET_VALUE | KEY_QUERY_VALUE) == ERROR_SUCCESS) {
 699     // Set to true while app-specific overrides are present that allow automatic
 700     // updates. When this is the case, the defaults are irrelevant and don't
 701     // need to be checked or reset.
 702     bool automatic_updates_allowed_by_overrides = true;
 703     DWORD value = 0;
 704     for (const base::string16& app_guid : app_guids) {
 705       // First check the app-specific override value and reset that if needed.
 706       // Note that this intentionally sets the override to AUTOMATIC_UPDATES
 707       // even if it was previously AUTO_UPDATES_ONLY. The thinking is that
 708       // AUTOMATIC_UPDATES is marginally more likely to let a user update and
 709       // this code is only called when a stuck user asks for updates.
 710       base::string16 app_update_override(kUpdateOverrideValuePrefix);
 711       app_update_override.append(app_guid);
 712       if (policy_key.ReadValueDW(app_update_override.c_str(),
 713                                  &value) != ERROR_SUCCESS) {
 714         automatic_updates_allowed_by_overrides = false;
 715       } else if (!GetUpdatePolicyFromDword(value, &update_policy) ||
 716                  update_policy != GoogleUpdateSettings::AUTOMATIC_UPDATES) {
 717         automatic_updates_allowed_by_overrides = false;
 718         ++needs_reset_count;
 719         if (policy_key.WriteValue(
 720                 app_update_override.c_str(),
 721                 static_cast<DWORD>(GoogleUpdateSettings::AUTOMATIC_UPDATES)) ==
 722             ERROR_SUCCESS) {
 723           ++did_reset_count;
 724         }
 725       }
 726     }
 727
 728     // If there were no app-specific override policies, see if there's a global
 729     // policy preventing updates and delete it if so.
 730     if (!automatic_updates_allowed_by_overrides &&
 731         policy_key.ReadValueDW(kUpdatePolicyValue, &value) == ERROR_SUCCESS &&
 732         (!GetUpdatePolicyFromDword(value, &update_policy) ||
 733          update_policy != GoogleUpdateSettings::AUTOMATIC_UPDATES)) {
 734       ++needs_reset_count;
 735       if (policy_key.DeleteValue(kUpdatePolicyValue) == ERROR_SUCCESS)
 736         ++did_reset_count;
 737     }
 738
 739     // Check the auto-update check period override. If it is 0 or exceeds
 740     // the maximum timeout, delete the override value.
 741     if (policy_key.ReadValueDW(kCheckPeriodOverrideMinutes,
 742                                &value) == ERROR_SUCCESS &&
 743         (value == 0 || value > kCheckPeriodOverrideMinutesMax)) {
 744       ++needs_reset_count;
 745       if (policy_key.DeleteValue(kCheckPeriodOverrideMinutes) == ERROR_SUCCESS)
 746         ++did_reset_count;
 747     }
 748
 749     // Return whether the number of successful resets is the same as the
 750     // number of things that appeared to need resetting.
 751     return (needs_reset_count == did_reset_count);
 752   } else {
 753     // For some reason we couldn't open the policy key with the desired
 754     // permissions to make changes (the most likely reason is that there is no
 755     // policy set). Simply return whether or not we think updates are enabled.
 756     return AreAutoupdatesEnabled();
 757   }
 758
 759 #endif
 760   // Non Google Chrome isn't going to autoupdate.
 761   return true;
 762 }
 763
 764 void GoogleUpdateSettings::RecordChromeUpdatePolicyHistograms() {
 765   const bool is_multi_install = InstallUtil::IsMultiInstall(
 766       BrowserDistribution::GetDistribution(), IsSystemInstall());
 767   const base::string16 app_guid =
 768       BrowserDistribution::GetSpecificDistribution(
 769           is_multi_install ? BrowserDistribution::CHROME_BINARIES :
 770                              BrowserDistribution::CHROME_BROWSER)->GetAppGuid();
 771
 772   bool is_overridden = false;
 773   const UpdatePolicy update_policy = GetAppUpdatePolicy(app_guid,
 774                                                         &is_overridden);
 775   UMA_HISTOGRAM_BOOLEAN("GoogleUpdate.UpdatePolicyIsOverridden", is_overridden);
 776   UMA_HISTOGRAM_ENUMERATION("GoogleUpdate.EffectivePolicy", update_policy,
 777                             UPDATE_POLICIES_COUNT);
 778 }
 779
 780 base::string16 GoogleUpdateSettings::GetUninstallCommandLine(
 781     bool system_install) {
 782   const HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 783   base::string16 cmd_line;
 784   RegKey update_key;
 785
 786   if (update_key.Open(root_key, google_update::kRegPathGoogleUpdate,
 787                       KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS) {
 788     update_key.ReadValue(google_update::kRegUninstallCmdLine, &cmd_line);
 789   }
 790
 791   return cmd_line;
 792 }
 793
 794 Version GoogleUpdateSettings::GetGoogleUpdateVersion(bool system_install) {
 795   const HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 796   base::string16 version;
 797   RegKey key;
 798
 799   if (key.Open(root_key,
 800                google_update::kRegPathGoogleUpdate,
 801                KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS &&
 802       key.ReadValue(google_update::kRegGoogleUpdateVersion, &version) ==
 803           ERROR_SUCCESS) {
 804     return Version(base::UTF16ToUTF8(version));
 805   }
 806
 807   return Version();
 808 }
 809
 810 base::Time GoogleUpdateSettings::GetGoogleUpdateLastStartedAU(
 811     bool system_install) {
 812   const HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 813   RegKey update_key;
 814
 815   if (update_key.Open(root_key,
 816                       google_update::kRegPathGoogleUpdate,
 817                       KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS) {
 818     DWORD last_start;
 819     if (update_key.ReadValueDW(google_update::kRegLastStartedAUField,
 820                                &last_start) == ERROR_SUCCESS) {
 821       return base::Time::FromTimeT(last_start);
 822     }
 823   }
 824
 825   return base::Time();
 826 }
 827
 828 base::Time GoogleUpdateSettings::GetGoogleUpdateLastChecked(
 829     bool system_install) {
 830   const HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 831   RegKey update_key;
 832
 833   if (update_key.Open(root_key,
 834                       google_update::kRegPathGoogleUpdate,
 835                       KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS) {
 836     DWORD last_check;
 837     if (update_key.ReadValueDW(google_update::kRegLastCheckedField,
 838                                &last_check) == ERROR_SUCCESS) {
 839       return base::Time::FromTimeT(last_check);
 840     }
 841   }
 842
 843   return base::Time();
 844 }
 845
 846 bool GoogleUpdateSettings::GetUpdateDetailForApp(bool system_install,
 847                                                  const wchar_t* app_guid,
 848                                                  ProductData* data) {
 849   DCHECK(app_guid);
 850   DCHECK(data);
 851
 852   bool product_found = false;
 853
 854   const HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 855   base::string16 clientstate_reg_path(google_update::kRegPathClientState);
 856   clientstate_reg_path.append(L"\\");
 857   clientstate_reg_path.append(app_guid);
 858
 859   RegKey clientstate;
 860   if (clientstate.Open(root_key,
 861                        clientstate_reg_path.c_str(),
 862                        KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS) {
 863     base::string16 version;
 864     DWORD dword_value;
 865     if ((clientstate.ReadValueDW(google_update::kRegLastCheckSuccessField,
 866                                  &dword_value) == ERROR_SUCCESS) &&
 867         (clientstate.ReadValue(google_update::kRegVersionField,
 868                                &version) == ERROR_SUCCESS)) {
 869       product_found = true;
 870       data->version = base::UTF16ToASCII(version);
 871       data->last_success = base::Time::FromTimeT(dword_value);
 872       data->last_result = 0;
 873       data->last_error_code = 0;
 874       data->last_extra_code = 0;
 875
 876       if (clientstate.ReadValueDW(google_update::kRegLastInstallerResultField,
 877                                   &dword_value) == ERROR_SUCCESS) {
 878         // Google Update convention is that if an installer writes an result
 879         // code that is invalid, it is clamped to an exit code result.
 880         const DWORD kMaxValidInstallResult = 4;  // INSTALLER_RESULT_EXIT_CODE
 881         data->last_result = std::min(dword_value, kMaxValidInstallResult);
 882       }
 883       if (clientstate.ReadValueDW(google_update::kRegLastInstallerErrorField,
 884                                   &dword_value) == ERROR_SUCCESS) {
 885         data->last_error_code = dword_value;
 886       }
 887       if (clientstate.ReadValueDW(google_update::kRegLastInstallerExtraField,
 888                                   &dword_value) == ERROR_SUCCESS) {
 889         data->last_extra_code = dword_value;
 890       }
 891     }
 892   }
 893
 894   return product_found;
 895 }
 896
 897 bool GoogleUpdateSettings::GetUpdateDetailForGoogleUpdate(bool system_install,
 898                                                           ProductData* data) {
 899   return GetUpdateDetailForApp(system_install,
 900                                google_update::kGoogleUpdateUpgradeCode,
 901                                data);
 902 }
 903
 904 bool GoogleUpdateSettings::GetUpdateDetail(bool system_install,
 905                                            ProductData* data) {
 906   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 907   return GetUpdateDetailForApp(system_install,
 908                                dist->GetAppGuid().c_str(),
 909                                data);
 910 }
 911
 912 bool GoogleUpdateSettings::SetExperimentLabels(
 913     bool system_install,
 914     const base::string16& experiment_labels) {
 915   HKEY reg_root = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 916
 917   // Use the browser distribution and install level to write to the correct
 918   // client state/app guid key.
 919   bool success = false;
 920   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 921   if (dist->ShouldSetExperimentLabels()) {
 922     base::string16 client_state_path(
 923         system_install ? dist->GetStateMediumKey() : dist->GetStateKey());
 924     RegKey client_state(
 925         reg_root, client_state_path.c_str(), KEY_SET_VALUE | KEY_WOW64_32KEY);
 926     if (experiment_labels.empty()) {
 927       success = client_state.DeleteValue(google_update::kExperimentLabels)
 928           == ERROR_SUCCESS;
 929     } else {
 930       success = client_state.WriteValue(google_update::kExperimentLabels,
 931           experiment_labels.c_str()) == ERROR_SUCCESS;
 932     }
 933   }
 934
 935   return success;
 936 }
 937
 938 bool GoogleUpdateSettings::ReadExperimentLabels(
 939     bool system_install,
 940     base::string16* experiment_labels) {
 941   HKEY reg_root = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 942
 943   // If this distribution does not set the experiment labels, don't bother
 944   // reading.
 945   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
 946   if (!dist->ShouldSetExperimentLabels())
 947     return false;
 948
 949   base::string16 client_state_path(
 950       system_install ? dist->GetStateMediumKey() : dist->GetStateKey());
 951
 952   RegKey client_state;
 953   LONG result = client_state.Open(
 954       reg_root, client_state_path.c_str(), KEY_QUERY_VALUE | KEY_WOW64_32KEY);
 955   if (result == ERROR_SUCCESS) {
 956     result = client_state.ReadValue(google_update::kExperimentLabels,
 957                                     experiment_labels);
 958   }
 959
 960   // If the key or value was not present, return the empty string.
 961   if (result == ERROR_FILE_NOT_FOUND || result == ERROR_PATH_NOT_FOUND) {
 962     experiment_labels->clear();
 963     return true;
 964   }
 965
 966   return result == ERROR_SUCCESS;
 967 }