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308 lines
13 KiB
308 lines
13 KiB
import 'dart:convert';
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:flutter/foundation.dart';
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import 'package:hive/hive.dart';
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import 'package:flutter_secure_storage/flutter_secure_storage.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:cryptography/cryptography.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import 'package:archive/archive_io.dart';
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import 'package:cake_wallet/core/key_service.dart';
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import 'package:cake_wallet/entities/encrypt.dart';
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import 'package:cake_wallet/entities/preferences_key.dart';
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import 'package:cake_wallet/entities/secret_store_key.dart';
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import 'package:cw_core/wallet_info.dart';
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import 'package:cake_wallet/.secrets.g.dart' as secrets;
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class BackupService {
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BackupService(this._flutterSecureStorage, this._walletInfoSource,
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this._keyService, this._sharedPreferences)
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: _cipher = chacha20Poly1305Aead;
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static const currentVersion = _v1;
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static const _v1 = 1;
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final Cipher _cipher;
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final FlutterSecureStorage _flutterSecureStorage;
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final SharedPreferences _sharedPreferences;
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final Box<WalletInfo> _walletInfoSource;
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final KeyService _keyService;
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Future<void> importBackup(Uint8List data, String password,
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{String nonce = secrets.backupSalt}) async {
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final version = getVersion(data);
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final backupBytes = data.toList()..removeAt(0);
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final backupData = Uint8List.fromList(backupBytes);
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switch (version) {
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case _v1:
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await _importBackupV1(backupData, password, nonce: nonce);
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break;
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default:
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break;
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}
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}
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Future<Uint8List> exportBackup(String password,
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{String nonce = secrets.backupSalt, int version = currentVersion}) async {
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switch (version) {
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case _v1:
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return await _exportBackupV1(password, nonce: nonce);
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default:
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return null;
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}
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}
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Future<Uint8List> _exportBackupV1(String password,
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{String nonce = secrets.backupSalt}) async {
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final zipEncoder = ZipFileEncoder();
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final appDir = await getApplicationDocumentsDirectory();
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final now = DateTime.now();
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final tmpDir = Directory('${appDir.path}/~_BACKUP_TMP');
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final archivePath = '${tmpDir.path}/backup_${now.toString()}.zip';
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final fileEntities = appDir.listSync(recursive: false);
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final keychainDump = await _exportKeychainDump(password, nonce: nonce);
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final preferencesDump = await _exportPreferencesJSON();
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final preferencesDumpFile = File('${tmpDir.path}/~_preferences_dump_TMP');
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final keychainDumpFile = File('${tmpDir.path}/~_keychain_dump_TMP');
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if (tmpDir.existsSync()) {
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tmpDir.deleteSync(recursive: true);
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}
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tmpDir.createSync();
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zipEncoder.create(archivePath);
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fileEntities.forEach((entity) {
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if (entity.path == archivePath || entity.path == tmpDir.path) {
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return;
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}
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if (entity.statSync().type == FileSystemEntityType.directory) {
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zipEncoder.addDirectory(Directory(entity.path));
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} else {
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zipEncoder.addFile(File(entity.path));
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}
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});
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await keychainDumpFile.writeAsBytes(keychainDump.toList());
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await preferencesDumpFile.writeAsString(preferencesDump);
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zipEncoder.addFile(preferencesDumpFile, '~_preferences_dump');
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zipEncoder.addFile(keychainDumpFile, '~_keychain_dump');
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zipEncoder.close();
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final content = File(archivePath).readAsBytesSync();
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tmpDir.deleteSync(recursive: true);
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final encryptedData = await _encrypt(content, password, nonce);
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return setVersion(encryptedData, currentVersion);
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}
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Future<void> _importBackupV1(Uint8List data, String password,
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{@required String nonce}) async {
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final appDir = await getApplicationDocumentsDirectory();
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final decryptedData = await _decrypt(data, password, nonce);
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final zip = ZipDecoder().decodeBytes(decryptedData);
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zip.files.forEach((file) {
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final filename = file.name;
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if (file.isFile) {
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final content = file.content as List<int>;
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File('${appDir.path}/' + filename)
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..createSync(recursive: true)
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..writeAsBytesSync(content);
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} else {
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Directory('${appDir.path}/' + filename)..create(recursive: true);
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}
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});
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await _importKeychainDump(password, nonce: nonce);
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await _importPreferencesDump();
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}
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Future<void> _importPreferencesDump() async {
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final appDir = await getApplicationDocumentsDirectory();
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final preferencesFile = File('${appDir.path}/~_preferences_dump');
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if (!preferencesFile.existsSync()) {
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return;
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}
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final data =
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json.decode(preferencesFile.readAsStringSync()) as Map<String, Object>;
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await _sharedPreferences.setString(PreferencesKey.currentWalletName,
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data[PreferencesKey.currentWalletName] as String);
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await _sharedPreferences.setInt(PreferencesKey.currentNodeIdKey,
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data[PreferencesKey.currentNodeIdKey] as int);
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await _sharedPreferences.setInt(PreferencesKey.currentBalanceDisplayModeKey,
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data[PreferencesKey.currentBalanceDisplayModeKey] as int);
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await _sharedPreferences.setInt(PreferencesKey.currentWalletType,
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data[PreferencesKey.currentWalletType] as int);
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await _sharedPreferences.setString(PreferencesKey.currentFiatCurrencyKey,
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data[PreferencesKey.currentFiatCurrencyKey] as String);
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await _sharedPreferences.setBool(
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PreferencesKey.shouldSaveRecipientAddressKey,
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data[PreferencesKey.shouldSaveRecipientAddressKey] as bool);
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await _sharedPreferences.setInt(
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PreferencesKey.currentTransactionPriorityKeyLegacy,
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data[PreferencesKey.currentTransactionPriorityKeyLegacy] as int);
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await _sharedPreferences.setBool(
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PreferencesKey.allowBiometricalAuthenticationKey,
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data[PreferencesKey.allowBiometricalAuthenticationKey] as bool);
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await _sharedPreferences.setInt(
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PreferencesKey.currentBitcoinElectrumSererIdKey,
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data[PreferencesKey.currentBitcoinElectrumSererIdKey] as int);
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await _sharedPreferences.setString(PreferencesKey.currentLanguageCode,
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data[PreferencesKey.currentLanguageCode] as String);
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await _sharedPreferences.setInt(PreferencesKey.displayActionListModeKey,
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data[PreferencesKey.displayActionListModeKey] as int);
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await _sharedPreferences.setInt(PreferencesKey.currentPinLength,
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data[PreferencesKey.currentPinLength] as int);
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await _sharedPreferences.setInt(
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PreferencesKey.currentTheme, data[PreferencesKey.currentTheme] as int);
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await _sharedPreferences.setInt(
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PreferencesKey.currentDefaultSettingsMigrationVersion,
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data[PreferencesKey.currentDefaultSettingsMigrationVersion] as int);
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await _sharedPreferences.setInt(PreferencesKey.moneroTransactionPriority,
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data[PreferencesKey.moneroTransactionPriority] as int);
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await _sharedPreferences.setInt(PreferencesKey.bitcoinTransactionPriority,
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data[PreferencesKey.bitcoinTransactionPriority] as int);
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await preferencesFile.delete();
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}
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Future<void> _importKeychainDump(String password,
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{@required String nonce,
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String keychainSalt = secrets.backupKeychainSalt}) async {
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final appDir = await getApplicationDocumentsDirectory();
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final keychainDumpFile = File('${appDir.path}/~_keychain_dump');
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final decryptedKeychainDumpFileData = await _decrypt(
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keychainDumpFile.readAsBytesSync(), '$keychainSalt$password', nonce);
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final keychainJSON = json.decode(utf8.decode(decryptedKeychainDumpFileData))
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as Map<String, dynamic>;
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final keychainWalletsInfo = keychainJSON['wallets'] as List;
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final decodedPin = keychainJSON['pin'] as String;
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final pinCodeKey = generateStoreKeyFor(key: SecretStoreKey.pinCodePassword);
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final backupPasswordKey =
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generateStoreKeyFor(key: SecretStoreKey.backupPassword);
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final backupPassword = keychainJSON[backupPasswordKey] as String;
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await _flutterSecureStorage.write(
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key: backupPasswordKey, value: backupPassword);
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keychainWalletsInfo.forEach((dynamic rawInfo) async {
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final info = rawInfo as Map<String, dynamic>;
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await importWalletKeychainInfo(info);
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});
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await _flutterSecureStorage.write(
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key: pinCodeKey, value: encodedPinCode(pin: decodedPin));
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keychainDumpFile.deleteSync();
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}
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Future<void> importWalletKeychainInfo(Map<String, dynamic> info) async {
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final name = info['name'] as String;
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final password = info['password'] as String;
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await _keyService.saveWalletPassword(walletName: name, password: password);
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}
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Future<Uint8List> _exportKeychainDump(String password,
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{@required String nonce,
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String keychainSalt = secrets.backupKeychainSalt}) async {
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final key = generateStoreKeyFor(key: SecretStoreKey.pinCodePassword);
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final encodedPin = await _flutterSecureStorage.read(key: key);
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final decodedPin = decodedPinCode(pin: encodedPin);
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final wallets =
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await Future.wait(_walletInfoSource.values.map((walletInfo) async {
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return {
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'name': walletInfo.name,
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'type': walletInfo.type.toString(),
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'password':
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await _keyService.getWalletPassword(walletName: walletInfo.name)
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};
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}));
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final backupPasswordKey =
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generateStoreKeyFor(key: SecretStoreKey.backupPassword);
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final backupPassword =
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await _flutterSecureStorage.read(key: backupPasswordKey);
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final data = utf8.encode(json.encode({
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'pin': decodedPin,
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'wallets': wallets,
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backupPasswordKey: backupPassword
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}));
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final encrypted = await _encrypt(
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Uint8List.fromList(data), '$keychainSalt$password', nonce);
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return encrypted;
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}
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Future<String> _exportPreferencesJSON() async {
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final preferences = <String, Object>{
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PreferencesKey.currentWalletName:
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_sharedPreferences.getString(PreferencesKey.currentWalletName),
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PreferencesKey.currentNodeIdKey:
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_sharedPreferences.getInt(PreferencesKey.currentNodeIdKey),
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PreferencesKey.currentBalanceDisplayModeKey: _sharedPreferences
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.getInt(PreferencesKey.currentBalanceDisplayModeKey),
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PreferencesKey.currentWalletType:
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_sharedPreferences.getInt(PreferencesKey.currentWalletType),
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PreferencesKey.currentFiatCurrencyKey:
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_sharedPreferences.getString(PreferencesKey.currentFiatCurrencyKey),
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PreferencesKey.shouldSaveRecipientAddressKey: _sharedPreferences
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.getBool(PreferencesKey.shouldSaveRecipientAddressKey),
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PreferencesKey.isDarkThemeLegacy:
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_sharedPreferences.getBool(PreferencesKey.isDarkThemeLegacy),
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PreferencesKey.currentPinLength:
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_sharedPreferences.getInt(PreferencesKey.currentPinLength),
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PreferencesKey.currentTransactionPriorityKeyLegacy: _sharedPreferences
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.getInt(PreferencesKey.currentTransactionPriorityKeyLegacy),
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PreferencesKey.allowBiometricalAuthenticationKey: _sharedPreferences
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.getBool(PreferencesKey.allowBiometricalAuthenticationKey),
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PreferencesKey.currentBitcoinElectrumSererIdKey: _sharedPreferences
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.getInt(PreferencesKey.currentBitcoinElectrumSererIdKey),
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PreferencesKey.currentLanguageCode:
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_sharedPreferences.getString(PreferencesKey.currentLanguageCode),
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PreferencesKey.displayActionListModeKey:
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_sharedPreferences.getInt(PreferencesKey.displayActionListModeKey),
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PreferencesKey.currentTheme:
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_sharedPreferences.getInt(PreferencesKey.currentTheme),
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PreferencesKey.currentDefaultSettingsMigrationVersion: _sharedPreferences
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.getInt(PreferencesKey.currentDefaultSettingsMigrationVersion),
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PreferencesKey.bitcoinTransactionPriority:
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_sharedPreferences.getInt(PreferencesKey.bitcoinTransactionPriority),
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PreferencesKey.moneroTransactionPriority:
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_sharedPreferences.getInt(PreferencesKey.moneroTransactionPriority),
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};
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return json.encode(preferences);
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}
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int getVersion(Uint8List data) => data.toList().first;
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Uint8List setVersion(Uint8List data, int version) {
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final bytes = data.toList()..insert(0, version);
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return Uint8List.fromList(bytes);
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}
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Future<Uint8List> _encrypt(
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Uint8List data, String secretKeySource, String nonceBase64) async {
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final secretKeyHash = await sha256.hash(utf8.encode(secretKeySource));
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final secretKey = SecretKey(secretKeyHash.bytes);
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final nonce = Nonce(base64.decode(nonceBase64));
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return await _cipher.encrypt(data, secretKey: secretKey, nonce: nonce);
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}
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Future<Uint8List> _decrypt(
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Uint8List data, String secretKeySource, String nonceBase64) async {
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final secretKeyHash = await sha256.hash(utf8.encode(secretKeySource));
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final secretKey = SecretKey(secretKeyHash.bytes);
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final nonce = Nonce(base64.decode(nonceBase64));
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return await _cipher.decrypt(data, secretKey: secretKey, nonce: nonce);
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}
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}
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