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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_OS_CRYPT_APP_BOUND_ENCRYPTION_PROVIDER_WIN_H_
#define CHROME_BROWSER_OS_CRYPT_APP_BOUND_ENCRYPTION_PROVIDER_WIN_H_
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "base/containers/span.h"
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/threading/sequence_bound.h"
#include "base/types/expected.h"
#include "base/win/windows_types.h"
#include "chrome/browser/os_crypt/app_bound_encryption_win.h"
#include "components/os_crypt/async/browser/key_provider.h"
class PrefService;
class PrefRegistrySimple;
namespace os_crypt {
class AppBoundEncryptionProviderTest;
FORWARD_DECLARE_TEST(AppBoundEncryptionWinReencryptTest, KeyProviderTest);
} // namespace os_crypt
namespace os_crypt_async {
namespace features {
// If enabled, App-Bound encryption will request that the version 3 key be used
// for data encryption by the elevated service.
BASE_DECLARE_FEATURE(kAppBoundEncryptionKeyV3);
// If enabled, will re-generate a new key for catastrophic failures. See
// `DetermineErrorType` in the cc file for the two current cases.
BASE_DECLARE_FEATURE(kRegenerateKeyForCatastrophicFailures);
} // namespace features
class AppBoundEncryptionProviderWin : public os_crypt_async::KeyProvider {
public:
explicit AppBoundEncryptionProviderWin(PrefService* local_state);
~AppBoundEncryptionProviderWin() override;
// Not copyable.
AppBoundEncryptionProviderWin(const AppBoundEncryptionProviderWin&) = delete;
AppBoundEncryptionProviderWin& operator=(
const AppBoundEncryptionProviderWin&) = delete;
static void RegisterLocalPrefs(PrefRegistrySimple* registry);
private:
FRIEND_TEST_ALL_PREFIXES(os_crypt::AppBoundEncryptionWinReencryptTest,
KeyProviderTest);
friend class os_crypt::AppBoundEncryptionProviderTest;
using ReadOnlyKeyData = const std::vector<uint8_t>;
using ReadWriteKeyData = std::vector<uint8_t>;
using OptionalReadWriteKeyData = std::optional<ReadWriteKeyData>;
using OptionalReadOnlyKeyData = std::optional<ReadOnlyKeyData>;
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class KeyRetrievalStatus {
kSuccess = 0,
kKeyNotFound = 1,
kKeyDecodeFailure = 2,
kInvalidKeyHeader = 3,
kKeyTooShort = 4,
kMaxValue = kKeyTooShort,
};
// os_crypt_async::KeyProvider interface.
void GetKey(KeyCallback callback) override;
bool UseForEncryption() override;
bool IsCompatibleWithOsCryptSync() override;
void GenerateAndPersistNewKeyInternal(KeyCallback callback);
base::expected<std::vector<uint8_t>, KeyRetrievalStatus>
RetrieveEncryptedKey();
void HandleEncryptedKey(ReadWriteKeyData decrypted_key,
KeyCallback callback,
OptionalReadOnlyKeyData encrypted_key);
void StoreAndReplyWithKey(
KeyCallback callback,
base::expected<std::pair<ReadWriteKeyData, OptionalReadOnlyKeyData>,
KeyProvider::KeyError> key_pair);
void StoreKey(base::span<const uint8_t> encrypted_key);
raw_ptr<PrefService> local_state_ GUARDED_BY_CONTEXT(sequence_checker_);
class COMWorker;
base::SequenceBound<COMWorker> com_worker_;
const os_crypt::SupportLevel support_level_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<AppBoundEncryptionProviderWin> weak_factory_{this};
};
} // namespace os_crypt_async
#endif // CHROME_BROWSER_OS_CRYPT_APP_BOUND_ENCRYPTION_PROVIDER_WIN_H_
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