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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include "base/functional/function_ref.h"
#include "base/logging.h"
#include "base/strings/strcat.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/registry.h"
#include "base/win/windows_types.h"
#include "chrome/updater/activity.h"
#include "chrome/updater/updater_scope.h"
#include "chrome/updater/util/win_util.h"
#include "chrome/updater/win/user_info.h"
#include "chrome/updater/win/win_constants.h"
namespace updater {
namespace {
using ProcessActiveBitUnderKeyCallback =
base::FunctionRef<bool(HKEY, const std::wstring&)>;
constexpr wchar_t kDidRun[] = L"dr";
bool GetActiveBitUnderKey(HKEY rootkey, const std::wstring& key_name) {
base::win::RegKey key;
if (key.Open(rootkey, key_name.c_str(), Wow6432(KEY_QUERY_VALUE)) ==
ERROR_SUCCESS) {
// We support both string and DWORD formats for backward compatibility.
std::wstring value;
if ((key.ReadValue(kDidRun, &value) == ERROR_SUCCESS) && (value == L"1")) {
return true;
}
DWORD value_dw = 0;
if ((key.ReadValueDW(kDidRun, &value_dw) == ERROR_SUCCESS) &&
(value_dw == 1)) {
return true;
}
}
return false;
}
// Always returns false to avoid the short circuit in ProcessActiveBit and
// the early return in ProcessSystemActiveBit.
bool ClearActiveBitUnderKey(HKEY rootkey, const std::wstring& key_name) {
base::win::RegKey key;
if (key.Open(rootkey, key_name.c_str(),
Wow6432(KEY_QUERY_VALUE | KEY_SET_VALUE)) != ERROR_SUCCESS) {
VLOG(3) << "Failed to open activity key with write for " << key_name;
return false;
}
if (!key.HasValue(kDidRun)) {
return false;
}
// We always clear the value as a string "0".
const LONG result = key.WriteValue(kDidRun, L"0");
VLOG_IF(2, result) << "Failed to clear activity key for " << key_name << ": "
<< result;
return false;
}
bool ProcessActiveBit(ProcessActiveBitUnderKeyCallback callback,
HKEY rootkey,
const std::wstring& sid,
const std::string& id) {
const std::wstring rootkey_suffix =
(rootkey == HKEY_USERS) ? base::StrCat({sid, L"\\"}) : L"";
const bool process_success = callback(
rootkey, base::StrCat({rootkey_suffix, GetAppClientStateKey(id)}));
// For Google Toolbar and similar apps that run at low integrity, we need to
// also look at the low integrity IE key. Note that we cannot use the
// IEGetWriteableHKCU function since this function assumes that we are
// running with the user's credentials. The path is as follows:
// USER_REG_VISTA_LOW_INTEGRITY_HKCU\\SID
// \\GOOPDATE_REG_RELATIVE_CLIENT_STATE\\app_guid
const std::wstring low_integrity_key_name =
base::StrCat({rootkey_suffix, USER_REG_VISTA_LOW_INTEGRITY_HKCU, L"\\",
sid, L"\\", GetAppClientStateKey(id)});
return callback(rootkey, low_integrity_key_name) || process_success;
}
bool ProcessUserActiveBit(ProcessActiveBitUnderKeyCallback callback,
const std::string& id) {
// Clear the active bit under HKCU.
std::wstring sid;
const HRESULT hr = GetProcessUser(nullptr, nullptr, &sid);
if (FAILED(hr)) {
VLOG(2) << "Failed to GetProcessUser " << hr;
return false;
}
return ProcessActiveBit(callback, HKEY_CURRENT_USER, sid, id);
}
bool ProcessSystemActiveBit(ProcessActiveBitUnderKeyCallback callback,
const std::string& id) {
// Clear the active bit under each user in HKU\<sid>.
for (base::win::RegistryKeyIterator it(HKEY_USERS, L"", KEY_WOW64_32KEY);
it.Valid(); ++it) {
const std::wstring sid = it.Name();
if (ProcessActiveBit(callback, HKEY_USERS, sid, id)) {
return true;
}
}
return false;
}
bool GetUserActiveBit(const std::string& id) {
// Read the active bit under HKCU.
return ProcessUserActiveBit(&GetActiveBitUnderKey, id);
}
void ClearUserActiveBit(const std::string& id) {
// Clear the active bit under HKCU.
ProcessUserActiveBit(&ClearActiveBitUnderKey, id);
}
bool GetSystemActiveBit(const std::string& id) {
// Read the active bit under each user in HKU\<sid>.
return ProcessSystemActiveBit(&GetActiveBitUnderKey, id);
}
void ClearSystemActiveBit(const std::string& id) {
// Clear the active bit under each user in HKU\<sid>.
ProcessSystemActiveBit(&ClearActiveBitUnderKey, id);
}
} // namespace
bool GetActiveBit(UpdaterScope scope, const std::string& id) {
switch (scope) {
case UpdaterScope::kUser:
return GetUserActiveBit(id);
case UpdaterScope::kSystem:
return GetSystemActiveBit(id);
}
}
void ClearActiveBit(UpdaterScope scope, const std::string& id) {
switch (scope) {
case UpdaterScope::kUser:
ClearUserActiveBit(id);
break;
case UpdaterScope::kSystem:
ClearSystemActiveBit(id);
break;
}
}
} // namespace updater
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