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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// chrome_tab.cc : Implementation of DLL Exports.
// Include without path to make GYP build see it.
#include "chrome_tab.h" // NOLINT
#include <atlsecurity.h>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/file_version_info.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/registry.h"
#include "base/string_piece.h"
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#include "base/win_util.h"
#include "chrome/common/chrome_constants.h"
#include "grit/chrome_frame_resources.h"
#include "chrome_frame/bho.h"
#include "chrome_frame/chrome_frame_automation.h"
#include "chrome_frame/chrome_frame_reporting.h"
#include "chrome_frame/chrome_launcher.h"
#include "chrome_frame/resource.h"
#include "chrome_frame/utils.h"
static const wchar_t kBhoRegistryPath[] =
L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer"
L"\\Browser Helper Objects";
const wchar_t kInternetSettings[] =
L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings";
const wchar_t kBhoNoLoadExplorerValue[] = L"NoExplorer";
class ChromeTabModule
: public AtlPerUserModule<CAtlDllModuleT<ChromeTabModule> > {
public:
typedef AtlPerUserModule<CAtlDllModuleT<ChromeTabModule> > ParentClass;
DECLARE_LIBID(LIBID_ChromeTabLib)
DECLARE_REGISTRY_APPID_RESOURCEID(IDR_CHROMETAB,
"{FD9B1B31-F4D8-436A-8F4F-D3C2E36733D3}")
// Override to add our SYSTIME binary value to registry scripts.
// See chrome_frame_activex.rgs for usage.
virtual HRESULT AddCommonRGSReplacements(IRegistrarBase* registrar) throw() {
HRESULT hr = ParentClass::AddCommonRGSReplacements(registrar);
if (SUCCEEDED(hr)) {
SYSTEMTIME local_time;
::GetSystemTime(&local_time);
std::string hex(HexEncode(&local_time, sizeof(local_time)));
base::StringPiece sp_hex(hex);
hr = registrar->AddReplacement(L"SYSTIME",
base::SysNativeMBToWide(sp_hex).c_str());
DCHECK(SUCCEEDED(hr));
}
if (SUCCEEDED(hr)) {
FilePath app_path =
chrome_launcher::GetChromeExecutablePath().DirName();
hr = registrar->AddReplacement(L"CHROME_APPPATH",
app_path.value().c_str());
DCHECK(SUCCEEDED(hr));
}
if (SUCCEEDED(hr)) {
hr = registrar->AddReplacement(L"CHROME_APPNAME",
chrome::kBrowserProcessExecutableName);
DCHECK(SUCCEEDED(hr));
// Fill in VERSION from the VERSIONINFO stored in the DLL's resources.
scoped_ptr<FileVersionInfo> module_version_info(
FileVersionInfo::CreateFileVersionInfoForCurrentModule());
DCHECK(module_version_info != NULL);
std::wstring file_version(module_version_info->file_version());
hr = registrar->AddReplacement(L"VERSION", file_version.c_str());
DCHECK(SUCCEEDED(hr));
}
if (SUCCEEDED(hr)) {
// Add the directory of chrome_launcher.exe. This will be the same
// as the directory for the current DLL.
std::wstring module_dir;
FilePath module_path;
if (PathService::Get(base::FILE_MODULE, &module_path)) {
module_dir = module_path.DirName().ToWStringHack();
} else {
NOTREACHED();
}
hr = registrar->AddReplacement(L"CHROME_LAUNCHER_APPPATH",
module_dir.c_str());
DCHECK(SUCCEEDED(hr));
}
if (SUCCEEDED(hr)) {
// Add the filename of chrome_launcher.exe
hr = registrar->AddReplacement(L"CHROME_LAUNCHER_APPNAME",
chrome_launcher::kLauncherExeBaseName);
DCHECK(SUCCEEDED(hr));
}
return hr;
}
};
ChromeTabModule _AtlModule;
base::AtExitManager* g_exit_manager = NULL;
bool RegisterSecuredMimeHandler(bool enable); // forward
// DLL Entry Point
extern "C" BOOL WINAPI DllMain(HINSTANCE instance,
DWORD reason,
LPVOID reserved) {
UNREFERENCED_PARAMETER(instance);
if (reason == DLL_PROCESS_ATTACH) {
#ifndef NDEBUG
// Silence traces from the ATL registrar to reduce the log noise.
ATL::CTrace::s_trace.ChangeCategory(atlTraceRegistrar, 0,
ATLTRACESTATUS_DISABLED);
#endif
g_exit_manager = new base::AtExitManager();
CommandLine::Init(0, NULL);
InitializeCrashReporting();
logging::InitLogging(NULL, logging::LOG_ONLY_TO_SYSTEM_DEBUG_LOG,
logging::LOCK_LOG_FILE, logging::DELETE_OLD_LOG_FILE);
} else if (reason == DLL_PROCESS_DETACH) {
g_patch_helper.UnpatchIfNeeded();
delete g_exit_manager;
g_exit_manager = NULL;
ShutdownCrashReporting();
}
return _AtlModule.DllMain(reason, reserved);
}
#ifdef _MANAGED
#pragma managed(pop)
#endif
const wchar_t kPostPlatformUAKey[] =
L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\"
L"User Agent\\Post Platform";
const wchar_t kClockUserAgent[] = L"chromeframe";
// To delete the clock user agent, set value to NULL.
// TODO(tommi): Remove this method when it's no longer used.
HRESULT SetClockUserAgent(const wchar_t* value) {
HRESULT hr;
RegKey ua_key;
if (ua_key.Create(HKEY_LOCAL_MACHINE, kPostPlatformUAKey, KEY_WRITE)) {
if (value) {
ua_key.WriteValue(kClockUserAgent, value);
} else {
ua_key.DeleteValue(kClockUserAgent);
}
hr = S_OK;
} else {
DLOG(ERROR) << __FUNCTION__ << ": " << kPostPlatformUAKey;
hr = E_UNEXPECTED;
}
return hr;
}
HRESULT RefreshElevationPolicy() {
const wchar_t kIEFrameDll[] = L"ieframe.dll";
const char kIERefreshPolicy[] = "IERefreshElevationPolicy";
HRESULT hr = E_NOTIMPL;
HMODULE ieframe_module = LoadLibrary(kIEFrameDll);
if (ieframe_module) {
typedef HRESULT (__stdcall *IERefreshPolicy)();
IERefreshPolicy ie_refresh_policy = reinterpret_cast<IERefreshPolicy>(
GetProcAddress(ieframe_module, kIERefreshPolicy));
if (ie_refresh_policy) {
hr = ie_refresh_policy();
} else {
hr = HRESULT_FROM_WIN32(GetLastError());
}
FreeLibrary(ieframe_module);
} else {
hr = HRESULT_FROM_WIN32(GetLastError());
}
return hr;
}
HRESULT RegisterChromeTabBHO() {
RegKey ie_bho_key;
if (!ie_bho_key.Create(HKEY_LOCAL_MACHINE, kBhoRegistryPath,
KEY_CREATE_SUB_KEY)) {
DLOG(WARNING) << "Failed to open registry key "
<< kBhoRegistryPath
<< " for write";
return E_FAIL;
}
wchar_t bho_class_id_as_string[MAX_PATH] = {0};
StringFromGUID2(CLSID_ChromeFrameBHO, bho_class_id_as_string,
arraysize(bho_class_id_as_string));
if (!ie_bho_key.CreateKey(bho_class_id_as_string, KEY_READ | KEY_WRITE)) {
DLOG(WARNING) << "Failed to create bho registry key under "
<< kBhoRegistryPath
<< " for write";
return E_FAIL;
}
ie_bho_key.WriteValue(kBhoNoLoadExplorerValue, 1);
DLOG(INFO) << "Registered ChromeTab BHO";
// We now add the chromeframe user agent at runtime.
// SetClockUserAgent(L"1");
RefreshElevationPolicy();
return S_OK;
}
HRESULT UnregisterChromeTabBHO() {
// TODO(tommi): remove this in future versions.
SetClockUserAgent(NULL);
RegKey ie_bho_key;
if (!ie_bho_key.Open(HKEY_LOCAL_MACHINE, kBhoRegistryPath,
KEY_READ | KEY_WRITE)) {
DLOG(WARNING) << "Failed to open registry key "
<< kBhoRegistryPath
<< " for write.";
return E_FAIL;
}
wchar_t bho_class_id_as_string[MAX_PATH] = {0};
StringFromGUID2(CLSID_ChromeFrameBHO, bho_class_id_as_string,
arraysize(bho_class_id_as_string));
if (!ie_bho_key.DeleteKey(bho_class_id_as_string)) {
DLOG(WARNING) << "Failed to delete bho registry key "
<< bho_class_id_as_string
<< " under "
<< kBhoRegistryPath;
return E_FAIL;
}
DLOG(INFO) << "Unregistered ChromeTab BHO";
return S_OK;
}
// Used to determine whether the DLL can be unloaded by OLE
STDAPI DllCanUnloadNow() {
return _AtlModule.DllCanUnloadNow();
}
// Returns a class factory to create an object of the requested type
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv) {
if (g_patch_helper.InitializeAndPatchProtocolsIfNeeded()) {
// We should only get here once.
UrlMkSetSessionOption(URLMON_OPTION_USERAGENT_REFRESH, NULL, 0, 0);
}
return _AtlModule.DllGetClassObject(rclsid, riid, ppv);
}
// DllRegisterServer - Adds entries to the system registry
STDAPI DllRegisterServer() {
// registers object, typelib and all interfaces in typelib
HRESULT hr = _AtlModule.DllRegisterServer(TRUE);
if (SUCCEEDED(hr)) {
// Best effort attempt to register the BHO. At this point we silently
// ignore any errors during registration. There are some traces emitted
// to the debug log.
RegisterChromeTabBHO();
if (!RegisterSecuredMimeHandler(true))
hr = E_FAIL;
}
if (UtilIsPersistentNPAPIMarkerSet()) {
hr = _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_NPAPI, TRUE);
}
return hr;
}
// DllUnregisterServer - Removes entries from the system registry
STDAPI DllUnregisterServer() {
HRESULT hr = _AtlModule.DllUnregisterServer(TRUE);
if (SUCCEEDED(hr)) {
// Best effort attempt to unregister the BHO. At this point we silently
// ignore any errors during unregistration. There are some traces emitted
// to the debug log.
UnregisterChromeTabBHO();
if (!RegisterSecuredMimeHandler(false))
hr = E_FAIL;
}
if (UtilIsNPAPIPluginRegistered()) {
hr = _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_NPAPI, FALSE);
}
return hr;
}
// Registers the NPAPI plugin and sets the persistent marker that tells us
// to re-register it through updates.
STDAPI RegisterNPAPIPlugin() {
HRESULT hr = _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_NPAPI,
TRUE);
if (SUCCEEDED(hr)) {
if (!UtilChangePersistentNPAPIMarker(true)) {
hr = E_FAIL;
}
}
return hr;
}
// Unregisters the NPAPI plugin and clears the persistent marker that tells us
// to re-register it through updates.
STDAPI UnregisterNPAPIPlugin() {
HRESULT hr = _AtlModule.UpdateRegistryFromResourceS(IDR_CHROMEFRAME_NPAPI,
FALSE);
if (SUCCEEDED(hr)) {
if (!UtilChangePersistentNPAPIMarker(false)) {
hr = E_FAIL;
}
}
return hr;
}
class SecurityDescBackup {
public:
explicit SecurityDescBackup(const std::wstring& backup_key)
: backup_key_name_(backup_key) {}
~SecurityDescBackup() {}
// Save given security descriptor to the backup key.
bool SaveSecurity(const CSecurityDesc& sd) {
CString str;
if (!sd.ToString(&str))
return false;
RegKey backup_key(HKEY_LOCAL_MACHINE, backup_key_name_.c_str(),
KEY_READ | KEY_WRITE);
if (backup_key.Valid()) {
return backup_key.WriteValue(NULL, str.GetString());
}
return false;
}
// Restore security descriptor from backup key to given key name.
bool RestoreSecurity(const wchar_t* key_name) {
std::wstring sddl;
if (!ReadBackupKey(&sddl))
return false;
// Create security descriptor from string.
CSecurityDesc sd;
if (!sd.FromString(sddl.c_str()))
return false;
bool result = true;
// Restore DACL and Owner of the key from saved security descriptor.
CDacl dacl;
CSid owner;
sd.GetDacl(&dacl);
sd.GetOwner(&owner);
DWORD error = ::SetNamedSecurityInfo(const_cast<wchar_t*>(key_name),
SE_REGISTRY_KEY, OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
const_cast<SID*>(owner.GetPSID()), NULL,
const_cast<ACL*>(dacl.GetPACL()), NULL);
DeleteBackupKey();
return (error == ERROR_SUCCESS);
}
private:
// Read SDDL string from backup key
bool ReadBackupKey(std::wstring* sddl) {
RegKey backup_key(HKEY_LOCAL_MACHINE, backup_key_name_.c_str(), KEY_READ);
if (!backup_key.Valid())
return false;
DWORD len = 0;
DWORD reg_type = REG_NONE;
if (!backup_key.ReadValue(NULL, NULL, &len, ®_type))
return false;
if (reg_type != REG_SZ)
return false;
size_t wchar_count = 1 + len / sizeof(wchar_t);
if (!backup_key.ReadValue(NULL, WriteInto(sddl, wchar_count), &len,
®_type)) {
return false;
}
return true;
}
void DeleteBackupKey() {
::RegDeleteKey(HKEY_LOCAL_MACHINE, backup_key_name_.c_str());
}
std::wstring backup_key_name_;
};
struct TokenWithPrivileges {
TokenWithPrivileges() {
token_.GetEffectiveToken(TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY);
token_.GetUser(&user_);
}
~TokenWithPrivileges() {
token_.EnableDisablePrivileges(take_ownership_);
token_.EnableDisablePrivileges(restore_);
}
bool EnablePrivileges() {
if (take_ownership_.GetCount() == 0)
if (!token_.EnablePrivilege(L"SeTakeOwnershipPrivilege",
&take_ownership_))
return false;
if (restore_.GetCount() == 0)
if (!token_.EnablePrivilege(L"SeRestorePrivilege", &restore_))
return false;
return true;
}
const CSid& GetUser() const {
return user_;
}
private:
CAccessToken token_;
CTokenPrivileges take_ownership_;
CTokenPrivileges restore_;
CSid user_;
};
static bool SetOrDeleteMimeHandlerKey(bool set) {
std::wstring key_name = kInternetSettings;
key_name.append(L"\\Secure Mime Handlers");
RegKey key(HKEY_LOCAL_MACHINE, key_name.c_str(), KEY_READ | KEY_WRITE);
if (!key.Valid())
return false;
bool result;
if (set) {
result = key.WriteValue(L"ChromeTab.ChromeActiveDocument", 1);
result = key.WriteValue(L"ChromeTab.ChromeActiveDocument.1", 1) && result;
} else {
result = key.DeleteValue(L"ChromeTab.ChromeActiveDocument");
result = key.DeleteValue(L"ChromeTab.ChromeActiveDocument.1") && result;
}
return result;
}
bool RegisterSecuredMimeHandler(bool enable) {
if (win_util::GetWinVersion() < win_util::WINVERSION_VISTA) {
return SetOrDeleteMimeHandlerKey(enable);
}
std::wstring mime_key = kInternetSettings;
mime_key.append(L"\\Secure Mime Handlers");
std::wstring backup_key = kInternetSettings;
backup_key.append(L"\\__backup_SMH__");
std::wstring object_name = L"MACHINE\\";
object_name.append(mime_key);
TokenWithPrivileges token_;
if (!token_.EnablePrivileges())
return false;
// If there is a backup key - something bad happened; try to restore
// security on "Secure Mime Handlers" from the backup.
SecurityDescBackup backup(backup_key);
backup.RestoreSecurity(object_name.c_str());
// Read old security descriptor of the Mime key first.
CSecurityDesc sd;
if (!AtlGetSecurityDescriptor(object_name.c_str(), SE_REGISTRY_KEY, &sd)) {
return false;
}
backup.SaveSecurity(sd);
bool result = false;
// set new owner
if (AtlSetOwnerSid(object_name.c_str(), SE_REGISTRY_KEY, token_.GetUser())) {
// set new dacl
CDacl new_dacl;
sd.GetDacl(&new_dacl);
new_dacl.AddAllowedAce(token_.GetUser(), GENERIC_WRITE | GENERIC_READ);
if (AtlSetDacl(object_name.c_str(), SE_REGISTRY_KEY, new_dacl)) {
result = SetOrDeleteMimeHandlerKey(enable);
}
}
backup.RestoreSecurity(object_name.c_str());
return result;
}
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