chrome_frame/chrome_tab.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 // chrome_tab.cc : Implementation of DLL Exports.
   6
   7 // Need to include this before the ATL headers below.
   8 #include "chrome_frame/chrome_tab.h"
   9
  10 #include <atlsecurity.h>
  11 #include <objbase.h>
  12
  13 #include "base/at_exit.h"
  14 #include "base/basictypes.h"
  15 #include "base/command_line.h"
  16 #include "base/file_util.h"
  17 #include "base/file_version_info.h"
  18 #include "base/logging.h"
  19 #include "base/logging_win.h"
  20 #include "base/path_service.h"
  21 #include "base/string16.h"
  22 #include "base/string_number_conversions.h"
  23 #include "base/string_util.h"
  24 #include "base/strings/string_piece.h"
  25 #include "base/strings/sys_string_conversions.h"
  26 #include "base/utf_string_conversions.h"
  27 #include "base/win/registry.h"
  28 #include "base/win/windows_version.h"
  29 #include "chrome/common/chrome_constants.h"
  30 #include "chrome/common/chrome_switches.h"
  31 #include "chrome/common/metrics/entropy_provider.h"
  32 #include "chrome/installer/util/google_update_settings.h"
  33 #include "chrome_frame/bho.h"
  34 #include "chrome_frame/chrome_active_document.h"
  35 #include "chrome_frame/chrome_frame_activex.h"
  36 #include "chrome_frame/chrome_frame_automation.h"
  37 #include "chrome_frame/chrome_frame_reporting.h"
  38 #include "chrome_frame/chrome_launcher_utils.h"
  39 #include "chrome_frame/chrome_protocol.h"
  40 #include "chrome_frame/dll_redirector.h"
  41 #include "chrome_frame/exception_barrier.h"
  42 #include "chrome_frame/pin_module.h"
  43 #include "chrome_frame/resource.h"
  44 #include "chrome_frame/utils.h"
  45 #include "googleurl/src/url_util.h"
  46 #include "grit/chrome_frame_resources.h"
  47
  48 using base::win::RegKey;
  49
  50 namespace {
  51
  52 const wchar_t kInternetSettings[] =
  53     L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings";
  54
  55 const wchar_t kProtocolHandlers[] =
  56     L"Software\\Classes\\Protocols\\Handler";
  57
  58 const wchar_t kRunOnce[] =
  59     L"Software\\Microsoft\\Windows\\CurrentVersion\\RunOnce";
  60
  61 const wchar_t kRunKeyName[] = L"ChromeFrameHelper";
  62
  63 const wchar_t kChromeFrameHelperExe[] = L"chrome_frame_helper.exe";
  64 const wchar_t kChromeFrameHelperStartupArg[] = L"--startup";
  65
  66 // Window class and window names.
  67 // TODO(robertshield): These and other constants need to be refactored into
  68 // a common chrome_frame_constants.h|cc and built into a separate lib
  69 // (either chrome_frame_utils or make another one).
  70 const wchar_t kChromeFrameHelperWindowClassName[] =
  71     L"ChromeFrameHelperWindowClass";
  72 const wchar_t kChromeFrameHelperWindowName[] =
  73     L"ChromeFrameHelperWindowName";
  74
  75 // {0562BFC3-2550-45b4-BD8E-A310583D3A6F}
  76 const GUID kChromeFrameProvider =
  77     { 0x562bfc3, 0x2550, 0x45b4,
  78         { 0xbd, 0x8e, 0xa3, 0x10, 0x58, 0x3d, 0x3a, 0x6f } };
  79
  80 const wchar_t kPostPlatformUAKey[] =
  81     L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\"
  82     L"User Agent\\Post Platform";
  83 const wchar_t kChromeFramePrefix[] = L"chromeframe/";
  84
  85 // See comments in DllGetClassObject.
  86 LPFNGETCLASSOBJECT g_dll_get_class_object_redir_ptr = NULL;
  87
  88 // This function has the side effect of initializing an unprotected
  89 // vector pointer inside GoogleUrl. If this is called during DLL loading,
  90 // it has the effect of avoiding an initialization race on that pointer.
  91 // TODO(siggi): fix GoogleUrl.
  92 void InitGoogleUrl() {
  93   static const char kDummyUrl[] = "http://www.google.com";
  94
  95   url_util::IsStandard(kDummyUrl,
  96                        url_parse::MakeRange(0, arraysize(kDummyUrl)));
  97 }
  98
  99 class ChromeTabModule : public CAtlDllModuleT<ChromeTabModule> {
 100  public:
 101   typedef CAtlDllModuleT<ChromeTabModule> ParentClass;
 102
 103   ChromeTabModule() : do_system_registration_(true), crash_reporting_(NULL) {}
 104
 105   DECLARE_LIBID(LIBID_ChromeTabLib)
 106   DECLARE_REGISTRY_APPID_RESOURCEID(IDR_CHROMETAB,
 107                                     "{FD9B1B31-F4D8-436A-8F4F-D3C2E36733D3}")
 108
 109   // Override to add our SYSTIME binary value to registry scripts.
 110   // See chrome_frame_activex.rgs for usage.
 111   virtual HRESULT AddCommonRGSReplacements(IRegistrarBase* registrar) throw() {
 112     HRESULT hr = ParentClass::AddCommonRGSReplacements(registrar);
 113
 114     if (SUCCEEDED(hr)) {
 115       SYSTEMTIME local_time;
 116       ::GetSystemTime(&local_time);
 117       std::string hex(base::HexEncode(&local_time, sizeof(local_time)));
 118       base::StringPiece sp_hex(hex);
 119       hr = registrar->AddReplacement(L"SYSTIME",
 120                                      base::SysNativeMBToWide(sp_hex).c_str());
 121       DCHECK(SUCCEEDED(hr));
 122     }
 123
 124     if (SUCCEEDED(hr)) {
 125       base::FilePath app_path =
 126           chrome_launcher::GetChromeExecutablePath().DirName();
 127       hr = registrar->AddReplacement(L"CHROME_APPPATH",
 128                                      app_path.value().c_str());
 129       DCHECK(SUCCEEDED(hr));
 130     }
 131
 132     if (SUCCEEDED(hr)) {
 133       hr = registrar->AddReplacement(L"CHROME_APPNAME",
 134                                      chrome::kBrowserProcessExecutableName);
 135       DCHECK(SUCCEEDED(hr));
 136
 137       // Fill in VERSION from the VERSIONINFO stored in the DLL's resources.
 138       scoped_ptr<FileVersionInfo> module_version_info(
 139           FileVersionInfo::CreateFileVersionInfoForCurrentModule());
 140       DCHECK(module_version_info != NULL);
 141       std::wstring file_version(module_version_info->file_version());
 142       hr = registrar->AddReplacement(L"VERSION", file_version.c_str());
 143       DCHECK(SUCCEEDED(hr));
 144     }
 145
 146     if (SUCCEEDED(hr)) {
 147       // Add the directory of chrome_launcher.exe.  This will be the same
 148       // as the directory for the current DLL.
 149       std::wstring module_dir;
 150       base::FilePath module_path;
 151       if (PathService::Get(base::FILE_MODULE, &module_path)) {
 152         module_dir = module_path.DirName().value();
 153       } else {
 154         NOTREACHED();
 155       }
 156       hr = registrar->AddReplacement(L"CHROME_LAUNCHER_APPPATH",
 157                                      module_dir.c_str());
 158       DCHECK(SUCCEEDED(hr));
 159     }
 160
 161     if (SUCCEEDED(hr)) {
 162       // Add the filename of chrome_launcher.exe
 163       hr = registrar->AddReplacement(L"CHROME_LAUNCHER_APPNAME",
 164                                      chrome_launcher::kLauncherExeBaseName);
 165       DCHECK(SUCCEEDED(hr));
 166     }
 167
 168     if (SUCCEEDED(hr)) {
 169       // Add the registry hive to use.
 170       // Note: This is ugly as hell. I'd rather use the pMapEntries parameter
 171       // to CAtlModule::UpdateRegistryFromResource, unfortunately we have a
 172       // few components that are registered by calling their
 173       // static T::UpdateRegistry() methods directly, which doesn't allow
 174       // pMapEntries to be passed through :-(
 175       if (do_system_registration_) {
 176         hr = registrar->AddReplacement(L"HIVE", L"HKLM");
 177       } else {
 178         hr = registrar->AddReplacement(L"HIVE", L"HKCU");
 179       }
 180       DCHECK(SUCCEEDED(hr));
 181     }
 182
 183     if (SUCCEEDED(hr)) {
 184       // Add the Chrome Frame CLSID.
 185       wchar_t cf_clsid[64];
 186       StringFromGUID2(CLSID_ChromeFrame, &cf_clsid[0], arraysize(cf_clsid));
 187       hr = registrar->AddReplacement(L"CHROME_FRAME_CLSID", &cf_clsid[0]);
 188     }
 189
 190     return hr;
 191   }
 192
 193   // The module is "locked" when an object takes a reference on it. The first
 194   // time it is locked, take a reference on crash reporting to bind its lifetime
 195   // to the module.
 196   virtual LONG Lock() throw() {
 197     LONG result = ParentClass::Lock();
 198     if (result == 1) {
 199       DCHECK_EQ(crash_reporting_,
 200                 static_cast<chrome_frame::ScopedCrashReporting*>(NULL));
 201       crash_reporting_ = new chrome_frame::ScopedCrashReporting();
 202     }
 203     return result;
 204   }
 205
 206   // The module is "unlocked" when an object that had a reference on it is
 207   // destroyed. The last time it is unlocked, release the reference on crash
 208   // reporting.
 209   virtual LONG Unlock() throw() {
 210     LONG result = ParentClass::Unlock();
 211     if (!result) {
 212       DCHECK_NE(crash_reporting_,
 213                 static_cast<chrome_frame::ScopedCrashReporting*>(NULL));
 214       delete crash_reporting_;
 215       crash_reporting_ = NULL;
 216     }
 217     return result;
 218   }
 219
 220   // See comments in AddCommonRGSReplacements
 221   bool do_system_registration_;
 222
 223  private:
 224   // A scoper created when the module is initially locked and destroyed when it
 225   // is finally unlocked. This is not a scoped_ptr since that could cause
 226   // reporting to shut down at exit, which would lead to problems with the
 227   // loader lock.
 228   chrome_frame::ScopedCrashReporting* crash_reporting_;
 229 };
 230
 231 ChromeTabModule _AtlModule;
 232
 233 base::AtExitManager* g_exit_manager = NULL;
 234
 235 HRESULT RefreshElevationPolicy() {
 236   const wchar_t kIEFrameDll[] = L"ieframe.dll";
 237   const char kIERefreshPolicy[] = "IERefreshElevationPolicy";
 238   HRESULT hr = E_NOTIMPL;
 239
 240   // Stick an SEH in the chain to prevent the VEH from picking up on first
 241   // chance exceptions caused by loading ieframe.dll. Use the vanilla
 242   // ExceptionBarrier to report any exceptions that do make their way to us
 243   // though.
 244   ExceptionBarrier barrier;
 245
 246   HMODULE ieframe_module = LoadLibrary(kIEFrameDll);
 247   if (ieframe_module) {
 248     typedef HRESULT (__stdcall *IERefreshPolicy)();
 249     IERefreshPolicy ie_refresh_policy = reinterpret_cast<IERefreshPolicy>(
 250         GetProcAddress(ieframe_module, kIERefreshPolicy));
 251
 252     if (ie_refresh_policy) {
 253       hr = ie_refresh_policy();
 254     } else {
 255       hr = HRESULT_FROM_WIN32(GetLastError());
 256     }
 257
 258     FreeLibrary(ieframe_module);
 259   } else {
 260     hr = HRESULT_FROM_WIN32(GetLastError());
 261   }
 262
 263   return hr;
 264 }
 265
 266 // Experimental boot prefetch optimization for Chrome Frame
 267 //
 268 // If chrome is warmed up during a single reboot, it gets paged
 269 // in for subsequent reboots and the cold startup times essentially
 270 // look like warm times thereafter! The 'warm up' is done by
 271 // setting up a 'RunOnce' key during DLLRegisterServer of
 272 // npchrome_frame.dll.
 273 //
 274 // This works because chrome prefetch becomes part of boot
 275 // prefetch file ntosboot-b00dfaad.pf and paged in on subsequent
 276 // reboots. As long as the sytem does not undergo significant
 277 // memory pressure those pages remain in memory and we get pretty
 278 // amazing startup times, down to about 300 ms from 1200 ms
 279 //
 280 // The downside is:
 281 // - Whether chrome frame is used or not, there's a read penalty
 282 //  (1200-300 =) 900 ms for every boot.
 283 // - Heavy system memory usage after reboot will nullify the benefits
 284 //  but the user will still pay the cost.
 285 // - Overall the time saved will always be less than total time spent
 286 //  paging in chrome
 287 // - We are not sure when the chrome 'warm up' will age out from the
 288 //  boot prefetch file.
 289 //
 290 // The idea here is to try this out on chrome frame dev channel
 291 // and see if it produces a significant drift in startup numbers.
 292 HRESULT SetupRunOnce() {
 293   HRESULT result = E_FAIL;
 294
 295   string16 channel_name;
 296   if (base::win::GetVersion() < base::win::VERSION_VISTA &&
 297       GoogleUpdateSettings::GetChromeChannelAndModifiers(true, &channel_name)) {
 298     std::transform(channel_name.begin(), channel_name.end(),
 299                    channel_name.begin(), tolower);
 300     // Use this only for the dev channel.
 301     if (channel_name.find(L"dev") != string16::npos) {
 302       HKEY hive = HKEY_CURRENT_USER;
 303       if (IsSystemProcess()) {
 304         // For system installs, our updates will be running as SYSTEM which
 305         // makes writing to a RunOnce key under HKCU not so terribly useful.
 306         hive = HKEY_LOCAL_MACHINE;
 307       }
 308
 309       RegKey run_once;
 310       LONG ret = run_once.Create(hive, kRunOnce, KEY_READ | KEY_WRITE);
 311       if (ret == ERROR_SUCCESS) {
 312         CommandLine run_once_cmd(chrome_launcher::GetChromeExecutablePath());
 313         run_once_cmd.AppendSwitchASCII(switches::kAutomationClientChannelID,
 314                                        "0");
 315         run_once_cmd.AppendSwitch(switches::kChromeFrame);
 316         ret = run_once.WriteValue(L"A",
 317                                   run_once_cmd.GetCommandLineString().c_str());
 318       }
 319       result = HRESULT_FROM_WIN32(ret);
 320     } else {
 321       result = S_FALSE;
 322     }
 323   } else {
 324     // We're on a non-XP version of Windows or on a stable channel. Nothing
 325     // needs doing.
 326     result = S_FALSE;
 327   }
 328
 329   return result;
 330 }
 331
 332 // Helper method called for user-level installs where we don't have admin
 333 // permissions. Starts up the long running process and registers it to get it
 334 // started at next boot.
 335 HRESULT SetupUserLevelHelper() {
 336   HRESULT hr = S_OK;
 337
 338   // Remove existing run-at-startup entry.
 339   base::win::RemoveCommandFromAutoRun(HKEY_CURRENT_USER, kRunKeyName);
 340
 341   // Build the chrome_frame_helper command line.
 342   base::FilePath module_path;
 343   base::FilePath helper_path;
 344   if (PathService::Get(base::FILE_MODULE, &module_path)) {
 345     module_path = module_path.DirName();
 346     helper_path = module_path.Append(kChromeFrameHelperExe);
 347     if (!file_util::PathExists(helper_path)) {
 348       // If we can't find the helper in the current directory, try looking
 349       // one up (this is the layout in the build output folder).
 350       module_path = module_path.DirName();
 351       helper_path = module_path.Append(kChromeFrameHelperExe);
 352       DCHECK(file_util::PathExists(helper_path)) <<
 353           "Could not find chrome_frame_helper.exe.";
 354     }
 355
 356     // Find window handle of existing instance.
 357     HWND old_window = FindWindow(kChromeFrameHelperWindowClassName,
 358                                  kChromeFrameHelperWindowName);
 359
 360     if (file_util::PathExists(helper_path)) {
 361       std::wstring helper_path_cmd(L"\"");
 362       helper_path_cmd += helper_path.value();
 363       helper_path_cmd += L"\" ";
 364       helper_path_cmd += kChromeFrameHelperStartupArg;
 365
 366       // Add new run-at-startup entry.
 367       if (!base::win::AddCommandToAutoRun(HKEY_CURRENT_USER, kRunKeyName,
 368                                           helper_path_cmd)) {
 369         hr = E_FAIL;
 370         LOG(ERROR) << "Could not add helper process to auto run key.";
 371       }
 372
 373       // Start new instance.
 374       base::LaunchOptions options;
 375       options.start_hidden = true;
 376       bool launched = base::LaunchProcess(helper_path.value(), options, NULL);
 377       if (!launched) {
 378         hr = E_FAIL;
 379         PLOG(DFATAL) << "Could not launch helper process.";
 380       }
 381
 382       // Kill old instance using window handle.
 383       if (IsWindow(old_window)) {
 384         BOOL result = PostMessage(old_window, WM_CLOSE, 0, 0);
 385         if (!result) {
 386           PLOG(ERROR) << "Failed to post close message to old helper process: ";
 387         }
 388       }
 389     } else {
 390       hr = HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND);
 391     }
 392   } else {
 393     hr = E_UNEXPECTED;
 394     NOTREACHED();
 395   }
 396
 397   return hr;
 398 }
 399
 400 // To delete the user agent, set value to NULL.
 401 // The is_system parameter indicates whether this is a per machine or a per
 402 // user installation.
 403 HRESULT SetChromeFrameUA(bool is_system, const wchar_t* value) {
 404   HRESULT hr = E_FAIL;
 405   HKEY parent_hive = is_system ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
 406
 407   RegKey ua_key;
 408   LONG reg_result = ua_key.Create(parent_hive, kPostPlatformUAKey,
 409                                   KEY_READ | KEY_WRITE);
 410   if (reg_result == ERROR_SUCCESS) {
 411     // Make sure that we unregister ChromeFrame UA strings registered previously
 412     wchar_t value_name[MAX_PATH + 1] = {};
 413     wchar_t value_data[MAX_PATH + 1] = {};
 414
 415     DWORD value_index = 0;
 416     while (value_index < ua_key.GetValueCount()) {
 417       DWORD name_size = arraysize(value_name);
 418       DWORD value_size = arraysize(value_data);
 419       DWORD type = 0;
 420       LRESULT ret = ::RegEnumValue(ua_key.Handle(), value_index, value_name,
 421                                    &name_size, NULL, &type,
 422                                    reinterpret_cast<BYTE*>(value_data),
 423                                    &value_size);
 424       if (ret == ERROR_SUCCESS) {
 425         if (StartsWith(value_name, kChromeFramePrefix, false)) {
 426           ua_key.DeleteValue(value_name);
 427         } else {
 428           ++value_index;
 429         }
 430       } else {
 431         break;
 432       }
 433     }
 434
 435     std::wstring chrome_frame_ua_value_name = kChromeFramePrefix;
 436     chrome_frame_ua_value_name += GetCurrentModuleVersion();
 437     if (value) {
 438       ua_key.WriteValue(chrome_frame_ua_value_name.c_str(), value);
 439     }
 440     hr = S_OK;
 441   } else {
 442     DLOG(ERROR) << __FUNCTION__ << ": " << kPostPlatformUAKey
 443                 << ", error code = " << reg_result;
 444     hr = HRESULT_FROM_WIN32(reg_result);
 445   }
 446   return hr;
 447 }
 448
 449 class SecurityDescBackup {
 450  public:
 451   explicit SecurityDescBackup(const std::wstring& backup_key)
 452       : backup_key_name_(backup_key) {}
 453   ~SecurityDescBackup() {}
 454
 455   // Save given security descriptor to the backup key.
 456   bool SaveSecurity(const CSecurityDesc& sd) {
 457     CString str;
 458     if (!sd.ToString(&str))
 459       return false;
 460
 461     RegKey backup_key(HKEY_LOCAL_MACHINE, backup_key_name_.c_str(),
 462                       KEY_READ | KEY_WRITE);
 463     if (backup_key.Valid()) {
 464       return backup_key.WriteValue(NULL, str.GetString()) == ERROR_SUCCESS;
 465     }
 466
 467     return false;
 468   }
 469
 470   // Restore security descriptor from backup key to given key name.
 471   bool RestoreSecurity(const wchar_t* key_name) {
 472     std::wstring sddl;
 473     if (!ReadBackupKey(&sddl))
 474       return false;
 475
 476     // Create security descriptor from string.
 477     CSecurityDesc sd;
 478     if (!sd.FromString(sddl.c_str()))
 479       return false;
 480
 481     bool result = true;
 482     // Restore DACL and Owner of the key from saved security descriptor.
 483     CDacl dacl;
 484     CSid owner;
 485     sd.GetDacl(&dacl);
 486     sd.GetOwner(&owner);
 487
 488     DWORD error = ::SetNamedSecurityInfo(const_cast<wchar_t*>(key_name),
 489         SE_REGISTRY_KEY, OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
 490         const_cast<SID*>(owner.GetPSID()), NULL,
 491         const_cast<ACL*>(dacl.GetPACL()), NULL);
 492
 493     DeleteBackupKey();
 494     return (error == ERROR_SUCCESS);
 495   }
 496
 497  private:
 498   // Read SDDL string from backup key
 499   bool ReadBackupKey(std::wstring* sddl) {
 500     RegKey backup_key(HKEY_LOCAL_MACHINE, backup_key_name_.c_str(), KEY_READ);
 501     if (!backup_key.Valid())
 502       return false;
 503
 504     DWORD len = 0;
 505     DWORD reg_type = REG_NONE;
 506     if (backup_key.ReadValue(NULL, NULL, &len, &reg_type) != ERROR_SUCCESS)
 507       return false;
 508     DCHECK_EQ(0u, len % sizeof(wchar_t));
 509
 510     if ((len == 0) || (reg_type != REG_SZ))
 511       return false;
 512
 513     size_t wchar_count = 1 + len / sizeof(wchar_t);
 514     if (backup_key.ReadValue(NULL, WriteInto(sddl, wchar_count), &len,
 515                              &reg_type) != ERROR_SUCCESS) {
 516       return false;
 517     }
 518
 519     return true;
 520   }
 521
 522   void DeleteBackupKey() {
 523     ::RegDeleteKey(HKEY_LOCAL_MACHINE, backup_key_name_.c_str());
 524   }
 525
 526   std::wstring backup_key_name_;
 527 };
 528
 529 struct TokenWithPrivileges {
 530   TokenWithPrivileges() {
 531     token_.GetEffectiveToken(TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY);
 532     token_.GetUser(&user_);
 533   }
 534
 535   ~TokenWithPrivileges() {
 536     token_.EnableDisablePrivileges(take_ownership_);
 537     token_.EnableDisablePrivileges(restore_);
 538   }
 539
 540   bool EnablePrivileges() {
 541     if (take_ownership_.GetCount() == 0)
 542       if (!token_.EnablePrivilege(L"SeTakeOwnershipPrivilege",
 543                                   &take_ownership_))
 544         return false;
 545
 546     if (restore_.GetCount() == 0)
 547       if (!token_.EnablePrivilege(L"SeRestorePrivilege", &restore_))
 548         return false;
 549
 550     return true;
 551   }
 552
 553   const CSid& GetUser() const {
 554     return user_;
 555   }
 556
 557  private:
 558   CAccessToken token_;
 559   CTokenPrivileges take_ownership_;
 560   CTokenPrivileges restore_;
 561   CSid user_;
 562 };
 563
 564 HRESULT SetOrDeleteMimeHandlerKey(bool set, HKEY root_key) {
 565   std::wstring key_name = kInternetSettings;
 566   key_name.append(L"\\Secure Mime Handlers");
 567   RegKey key(root_key, key_name.c_str(), KEY_READ | KEY_WRITE);
 568   if (!key.Valid())
 569     return false;
 570
 571   LONG result1 = ERROR_SUCCESS;
 572   LONG result2 = ERROR_SUCCESS;
 573   if (set) {
 574     result1 = key.WriteValue(L"ChromeTab.ChromeActiveDocument", 1);
 575     result2 = key.WriteValue(L"ChromeTab.ChromeActiveDocument.1", 1);
 576   } else {
 577     result1 = key.DeleteValue(L"ChromeTab.ChromeActiveDocument");
 578     result2 = key.DeleteValue(L"ChromeTab.ChromeActiveDocument.1");
 579   }
 580
 581   return result1 != ERROR_SUCCESS ? HRESULT_FROM_WIN32(result1) :
 582                                     HRESULT_FROM_WIN32(result2);
 583 }
 584
 585 void OnPinModule() {
 586   // Pin crash reporting by leaking a reference.
 587   ignore_result(new chrome_frame::ScopedCrashReporting());
 588 }
 589
 590 // Chrome Frame registration functions.
 591 //-----------------------------------------------------------------------------
 592 HRESULT RegisterSecuredMimeHandler(bool enable, bool is_system) {
 593   if (!is_system) {
 594     return SetOrDeleteMimeHandlerKey(enable, HKEY_CURRENT_USER);
 595   } else if (base::win::GetVersion() < base::win::VERSION_VISTA) {
 596     return SetOrDeleteMimeHandlerKey(enable, HKEY_LOCAL_MACHINE);
 597   }
 598
 599   std::wstring mime_key = kInternetSettings;
 600   mime_key.append(L"\\Secure Mime Handlers");
 601   std::wstring backup_key = kInternetSettings;
 602   backup_key.append(L"\\__backup_SMH__");
 603   std::wstring object_name = L"MACHINE\\";
 604   object_name.append(mime_key);
 605
 606   TokenWithPrivileges token_;
 607   if (!token_.EnablePrivileges())
 608     return E_ACCESSDENIED;
 609
 610   // If there is a backup key - something bad happened; try to restore
 611   // security on "Secure Mime Handlers" from the backup.
 612   SecurityDescBackup backup(backup_key);
 613   backup.RestoreSecurity(object_name.c_str());
 614
 615   // Read old security descriptor of the Mime key first.
 616   CSecurityDesc sd;
 617   if (!AtlGetSecurityDescriptor(object_name.c_str(), SE_REGISTRY_KEY, &sd)) {
 618     return E_FAIL;
 619   }
 620
 621   backup.SaveSecurity(sd);
 622   HRESULT hr = E_FAIL;
 623   // set new owner
 624   if (AtlSetOwnerSid(object_name.c_str(), SE_REGISTRY_KEY, token_.GetUser())) {
 625     // set new dacl
 626     CDacl new_dacl;
 627     sd.GetDacl(&new_dacl);
 628     new_dacl.AddAllowedAce(token_.GetUser(), GENERIC_WRITE | GENERIC_READ);
 629     if (AtlSetDacl(object_name.c_str(), SE_REGISTRY_KEY, new_dacl)) {
 630       hr = SetOrDeleteMimeHandlerKey(enable, HKEY_LOCAL_MACHINE);
 631     }
 632   }
 633
 634   backup.RestoreSecurity(object_name.c_str());
 635   return hr;
 636 }
 637
 638 HRESULT RegisterActiveDoc(bool reg, bool is_system) {
 639   // We have to call the static T::UpdateRegistry function instead of
 640   // _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_ACTIVEDOC, reg)
 641   // because there is specific OLEMISC replacement.
 642   return ChromeActiveDocument::UpdateRegistry(reg);
 643 }
 644
 645 HRESULT RegisterActiveX(bool reg, bool is_system) {
 646   // We have to call the static T::UpdateRegistry function instead of
 647   // _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_ACTIVEX, reg)
 648   // because there is specific OLEMISC replacement.
 649   return ChromeFrameActivex::UpdateRegistry(reg);
 650 }
 651
 652 HRESULT RegisterElevationPolicy(bool reg, bool is_system) {
 653   HRESULT hr = S_OK;
 654   if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
 655     // Register the elevation policy. This must succeed for Chrome Frame to
 656     // be able launch Chrome when running in low-integrity IE.
 657     hr = _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_ELEVATION, reg);
 658     if (SUCCEEDED(hr)) {
 659       // Ignore failures since old versions of IE 7 (e.g., 7.0.6000.16386, which
 660       // shipped with Vista RTM) do not export IERefreshElevationPolicy.
 661       RefreshElevationPolicy();
 662     }
 663   }
 664   return hr;
 665 }
 666
 667 HRESULT RegisterProtocol(bool reg, bool is_system) {
 668   return _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEPROTOCOL, reg);
 669 }
 670
 671 HRESULT RegisterBhoClsid(bool reg, bool is_system) {
 672   return Bho::UpdateRegistry(reg);
 673 }
 674
 675 HRESULT RegisterBhoIE(bool reg, bool is_system) {
 676   if (is_system) {
 677     return _AtlModule.UpdateRegistryFromResourceS(IDR_REGISTER_BHO, reg);
 678   } else {
 679     if (reg) {
 680       // Setup the long running process:
 681       return SetupUserLevelHelper();
 682     } else {
 683       // Unschedule the user-level helper. Note that we don't kill it here
 684       // so that during updates we don't have a time window with no running
 685       // helper. Uninstalls and updates will explicitly kill the helper from
 686       // within the installer. Unregister existing run-at-startup entry.
 687       return base::win::RemoveCommandFromAutoRun(HKEY_CURRENT_USER,
 688                                                  kRunKeyName) ? S_OK : E_FAIL;
 689     }
 690   }
 691 }
 692
 693 HRESULT RegisterTypeLib(bool reg, bool is_system) {
 694   if (reg && !is_system) {
 695     // Enables the RegisterTypeLib Function function to override default
 696     // registry mappings under Windows Vista Service Pack 1 (SP1),
 697     // Windows Server 2008, and later operating system versions
 698     typedef void (WINAPI* OaEnablePerUserTypeLibReg)(void);
 699     OaEnablePerUserTypeLibReg per_user_typelib_func =
 700         reinterpret_cast<OaEnablePerUserTypeLibReg>(
 701             GetProcAddress(GetModuleHandle(L"oleaut32.dll"),
 702                            "OaEnablePerUserTLibRegistration"));
 703     if (per_user_typelib_func) {
 704       (*per_user_typelib_func)();
 705     }
 706   }
 707   return reg ?
 708       UtilRegisterTypeLib(_AtlComModule.m_hInstTypeLib,
 709                           NULL, !is_system) :
 710       UtilUnRegisterTypeLib(_AtlComModule.m_hInstTypeLib,
 711                             NULL, !is_system);
 712 }
 713
 714 HRESULT RegisterLegacyNPAPICleanup(bool reg, bool is_system) {
 715   if (!reg) {
 716     _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_NPAPI, reg);
 717     UtilRemovePersistentNPAPIMarker();
 718   }
 719   // Ignore failures.
 720   return S_OK;
 721 }
 722
 723 HRESULT RegisterAppId(bool reg, bool is_system) {
 724   return _AtlModule.UpdateRegistryAppId(reg);
 725 }
 726
 727 HRESULT RegisterUserAgent(bool reg, bool is_system) {
 728   if (reg) {
 729     return SetChromeFrameUA(is_system, L"1");
 730   } else {
 731     return SetChromeFrameUA(is_system, NULL);
 732   }
 733 }
 734
 735 enum RegistrationStepId {
 736   kStepSecuredMimeHandler = 0,
 737   kStepActiveDoc          = 1,
 738   kStepActiveX            = 2,
 739   kStepElevationPolicy    = 3,
 740   kStepProtocol           = 4,
 741   kStepBhoClsid           = 5,
 742   kStepBhoRegistration    = 6,
 743   kStepRegisterTypeLib    = 7,
 744   kStepNpapiCleanup       = 8,
 745   kStepAppId              = 9,
 746   kStepUserAgent          = 10,
 747   kStepEnd                = 11
 748 };
 749
 750 enum RegistrationFlags {
 751   ACTIVEX             = 0x0001,
 752   ACTIVEDOC           = 0x0002,
 753   GCF_PROTOCOL        = 0x0004,
 754   BHO_CLSID           = 0x0008,
 755   BHO_REGISTRATION    = 0x0010,
 756   TYPELIB             = 0x0020,
 757
 758   ALL                 = 0xFFFF
 759 };
 760
 761 // Mux the failure step into the hresult. We take only the first four bits
 762 // and stick those into the top four bits of the facility code. We also set the
 763 // Customer bit to be polite. Graphically, we write our error code to the
 764 // bits marked with ^:
 765 //   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
 766 //   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 767 //  +---+-+-+-----------------------+-------------------------------+
 768 //  |Sev|C|R|     Facility          |               Code            |
 769 //  +---+-+-+-----------------------+-------------------------------+
 770 //       ^   ^ ^ ^ ^
 771 // See http://msdn.microsoft.com/en-us/library/cc231198(PROT.10).aspx for
 772 // more details on HRESULTS.
 773 //
 774 // The resulting error can be extracted by:
 775 // error_code = (fiddled_hr & 0x07800000) >> 23
 776 HRESULT MuxErrorIntoHRESULT(HRESULT hr, int error_code) {
 777   DCHECK_GE(error_code, 0);
 778   DCHECK_LT(error_code, kStepEnd);
 779   COMPILE_ASSERT(kStepEnd <= 0xF, update_error_muxing_too_many_steps);
 780
 781   // Check that our four desired bits are clear.
 782   // 0xF87FFFFF == 11111000011111111111111111111111
 783   DCHECK_EQ(static_cast<HRESULT>(hr & 0xF87FFFFF), hr);
 784
 785   HRESULT fiddled_hr = ((error_code & 0xF) << 23) | hr;
 786   fiddled_hr |= 1 << 29;  // Set the customer bit.
 787
 788   return fiddled_hr;
 789 }
 790
 791 HRESULT CustomRegistration(uint16 reg_flags, bool reg, bool is_system) {
 792   if (reg && (reg_flags & (ACTIVEDOC | ACTIVEX)))
 793     reg_flags |= (TYPELIB | GCF_PROTOCOL);
 794
 795   // Set the flag that gets checked in AddCommonRGSReplacements before doing
 796   // registration work.
 797   _AtlModule.do_system_registration_ = is_system;
 798
 799   typedef HRESULT (*RegistrationFn)(bool reg, bool is_system);
 800   struct RegistrationStep {
 801     RegistrationStepId id;
 802     uint16 condition;
 803     RegistrationFn func;
 804   };
 805   static const RegistrationStep registration_steps[] = {
 806     { kStepSecuredMimeHandler, ACTIVEDOC, &RegisterSecuredMimeHandler },
 807     { kStepActiveDoc, ACTIVEDOC, &RegisterActiveDoc },
 808     { kStepActiveX, ACTIVEX, &RegisterActiveX },
 809     { kStepElevationPolicy, (ACTIVEDOC | ACTIVEX), &RegisterElevationPolicy },
 810     { kStepProtocol, GCF_PROTOCOL, &RegisterProtocol },
 811     { kStepBhoClsid, BHO_CLSID, &RegisterBhoClsid },
 812     { kStepBhoRegistration, BHO_REGISTRATION, &RegisterBhoIE },
 813     { kStepRegisterTypeLib, TYPELIB, &RegisterTypeLib },
 814     { kStepNpapiCleanup, ALL, &RegisterLegacyNPAPICleanup },
 815     { kStepAppId, ALL, &RegisterAppId },
 816     { kStepUserAgent, ALL, &RegisterUserAgent }
 817   };
 818
 819   HRESULT hr = S_OK;
 820
 821   bool rollback = false;
 822   int failure_step = 0;
 823   HRESULT step_hr = S_OK;
 824   for (int step = 0; step < arraysize(registration_steps); ++step) {
 825     if ((reg_flags & registration_steps[step].condition) != 0) {
 826       step_hr = registration_steps[step].func(reg, is_system);
 827       if (FAILED(step_hr)) {
 828         // Store only the first failing HRESULT with the step value muxed in.
 829         if (hr == S_OK) {
 830           hr = MuxErrorIntoHRESULT(step_hr, step);
 831         }
 832
 833         // On registration if a step fails, we abort and rollback.
 834         if (reg) {
 835           rollback = true;
 836           failure_step = step;
 837           break;
 838         }
 839       }
 840     }
 841   }
 842
 843   if (rollback) {
 844     DCHECK(reg);
 845     // Rollback the failing action and all preceding ones.
 846     for (int step = failure_step; step >= 0; --step) {
 847       registration_steps[step].func(!reg, is_system);
 848     }
 849   }
 850
 851   return hr;
 852 }
 853
 854 }  // namespace
 855
 856 // DLL Entry Point
 857 extern "C" BOOL WINAPI DllMain(HINSTANCE instance,
 858                                DWORD reason,
 859                                LPVOID reserved) {
 860   UNREFERENCED_PARAMETER(instance);
 861   if (reason == DLL_PROCESS_ATTACH) {
 862 #ifndef NDEBUG
 863     // Silence traces from the ATL registrar to reduce the log noise.
 864     ATL::CTrace::s_trace.ChangeCategory(atlTraceRegistrar, 0,
 865                                         ATLTRACESTATUS_DISABLED);
 866 #endif
 867     InitGoogleUrl();
 868
 869     g_exit_manager = new base::AtExitManager();
 870     CommandLine::Init(0, NULL);
 871     logging::InitLogging(
 872         NULL,
 873         logging::LOG_ONLY_TO_SYSTEM_DEBUG_LOG,
 874         logging::LOCK_LOG_FILE,
 875         logging::DELETE_OLD_LOG_FILE,
 876         logging::DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS);
 877
 878     // Log the same items as Chrome.
 879     logging::SetLogItems(true,  // enable_process_id
 880                          true,  // enable_thread_id
 881                          false, // enable_timestamp
 882                          true); // enable_tickcount
 883
 884     DllRedirector* dll_redirector = DllRedirector::GetInstance();
 885     DCHECK(dll_redirector);
 886
 887     if (!dll_redirector->RegisterAsFirstCFModule()) {
 888       // Someone else was here first, try and get a pointer to their
 889       // DllGetClassObject export:
 890       g_dll_get_class_object_redir_ptr =
 891           dll_redirector->GetDllGetClassObjectPtr();
 892       DCHECK(g_dll_get_class_object_redir_ptr != NULL)
 893           << "Found CF module with no DllGetClassObject export.";
 894     }
 895
 896     // Enable trace control and transport through event tracing for Windows.
 897     logging::LogEventProvider::Initialize(kChromeFrameProvider);
 898
 899     // Set a callback so that crash reporting can be pinned when the module is
 900     // pinned.
 901     chrome_frame::SetPinModuleCallback(&OnPinModule);
 902   } else if (reason == DLL_PROCESS_DETACH) {
 903     DllRedirector* dll_redirector = DllRedirector::GetInstance();
 904     DCHECK(dll_redirector);
 905     dll_redirector->UnregisterAsFirstCFModule();
 906
 907     g_patch_helper.UnpatchIfNeeded();
 908
 909     delete g_exit_manager;
 910     g_exit_manager = NULL;
 911   }
 912   return _AtlModule.DllMain(reason, reserved);
 913 }
 914
 915 // Used to determine whether the DLL can be unloaded by OLE
 916 STDAPI DllCanUnloadNow() {
 917   return _AtlModule.DllCanUnloadNow();
 918 }
 919
 920 // Returns a class factory to create an object of the requested type
 921 STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv) {
 922   chrome_frame::ScopedCrashReporting crash_reporting;
 923
 924   // If we found another module present when we were loaded, then delegate to
 925   // that:
 926   if (g_dll_get_class_object_redir_ptr) {
 927     return g_dll_get_class_object_redir_ptr(rclsid, riid, ppv);
 928   }
 929
 930   // Enable sniffing and switching only if asked for BHO
 931   // (we use BHO to get loaded in IE).
 932   if (rclsid == CLSID_ChromeFrameBHO) {
 933     g_patch_helper.InitializeAndPatchProtocolsIfNeeded();
 934   }
 935
 936   return _AtlModule.DllGetClassObject(rclsid, riid, ppv);
 937 }
 938
 939 // DllRegisterServer - Adds entries to the system registry
 940 STDAPI DllRegisterServer() {
 941   chrome_frame::ScopedCrashReporting crash_reporting;
 942   uint16 flags =  ACTIVEX | ACTIVEDOC | TYPELIB | GCF_PROTOCOL |
 943                   BHO_CLSID | BHO_REGISTRATION;
 944
 945   HRESULT hr = CustomRegistration(flags, true, true);
 946   if (SUCCEEDED(hr)) {
 947     SetupRunOnce();
 948   }
 949
 950   return hr;
 951 }
 952
 953 // DllUnregisterServer - Removes entries from the system registry
 954 STDAPI DllUnregisterServer() {
 955   chrome_frame::ScopedCrashReporting crash_reporting;
 956   HRESULT hr = CustomRegistration(ALL, false, true);
 957   return hr;
 958 }
 959
 960 // DllRegisterUserServer - Adds entries to the HKCU hive in the registry.
 961 STDAPI DllRegisterUserServer() {
 962   chrome_frame::ScopedCrashReporting crash_reporting;
 963   UINT flags =  ACTIVEX | ACTIVEDOC | TYPELIB | GCF_PROTOCOL |
 964                 BHO_CLSID | BHO_REGISTRATION;
 965
 966   HRESULT hr = CustomRegistration(flags, TRUE, false);
 967   if (SUCCEEDED(hr)) {
 968     SetupRunOnce();
 969   }
 970
 971   return hr;
 972 }
 973
 974 // DllUnregisterUserServer - Removes entries from the HKCU hive in the registry.
 975 STDAPI DllUnregisterUserServer() {
 976   chrome_frame::ScopedCrashReporting crash_reporting;
 977   HRESULT hr = CustomRegistration(ALL, FALSE, false);
 978   return hr;
 979 }
 980
 981 // Object entries go here instead of with each object, so that we can move
 982 // the objects to a lib. Also reduces magic.
 983 OBJECT_ENTRY_AUTO(CLSID_ChromeFrameBHO, Bho)
 984 OBJECT_ENTRY_AUTO(__uuidof(ChromeActiveDocument), ChromeActiveDocument)
 985 OBJECT_ENTRY_AUTO(__uuidof(ChromeFrame), ChromeFrameActivex)
 986 OBJECT_ENTRY_AUTO(__uuidof(ChromeProtocol), ChromeProtocol)