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- // Copyright (c) 2012 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.
- //
- // A helper library to keep track of a user's key by SID.
- // Used by RLZ libary. Also to be used by SearchWithGoogle library.
- #include "rlz/win/lib/registry_util.h"
- #include "base/process/process_info.h"
- #include "base/strings/utf_string_conversions.h"
- #include "base/win/registry.h"
- #include "base/win/windows_version.h"
- #include "rlz/lib/assert.h"
- #include "rlz/win/lib/process_info.h"
- #include <windows.h>
- namespace rlz_lib {
- bool RegKeyReadValue(const base::win::RegKey& key, const wchar_t* name,
- char* value, size_t* value_size) {
- value[0] = 0;
- std::wstring value_string;
- if (key.ReadValue(name, &value_string) != ERROR_SUCCESS) {
- return false;
- }
- if (value_string.length() > *value_size) {
- *value_size = value_string.length();
- return false;
- }
- // Note that RLZ string are always ASCII by design.
- strncpy(value, base::WideToUTF8(value_string).c_str(), *value_size);
- value[*value_size - 1] = 0;
- return true;
- }
- bool RegKeyWriteValue(base::win::RegKey* key, const wchar_t* name,
- const char* value) {
- std::wstring value_string(base::ASCIIToWide(value));
- return key->WriteValue(name, value_string.c_str()) == ERROR_SUCCESS;
- }
- bool HasUserKeyAccess(bool write_access) {
- // The caller is trying to access HKEY_CURRENT_USER. Test to see if we can
- // read from there. Don't try HKEY_CURRENT_USER because this will cause
- // problems in the unit tests: if we open HKEY_CURRENT_USER directly here,
- // the overriding done for unit tests will no longer work. So we try subkey
- // "Software" which is known to always exist.
- base::win::RegKey key;
- if (key.Open(HKEY_CURRENT_USER, L"Software", KEY_READ) != ERROR_SUCCESS)
- ASSERT_STRING("Could not open HKEY_CURRENT_USER");
- if (ProcessInfo::IsRunningAsSystem()) {
- ASSERT_STRING("UserKey::HasAccess: No access as SYSTEM without SID set.");
- return false;
- }
- if (write_access) {
- if (base::GetCurrentProcessIntegrityLevel() <= base::LOW_INTEGRITY) {
- ASSERT_STRING("UserKey::HasAccess: Cannot write from Low Integrity.");
- return false;
- }
- }
- return true;
- }
- } // namespace rlz_lib
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