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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 | /** * Encrypted Chat History Storage * * Provides encrypted persistence for chat messages and conversations. * Uses AES-256-GCM encryption with the secure storage infrastructure. * * Security features: * - All chat data encrypted at rest * - Master key stored in OS keychain when available * - Automatic key derivation with key rotation support * - Secure backup to encrypted localStorage */ import { deriveKey, encryptObject, decryptObject, generateMasterKey, hashSha256, isValidEncryptedData, clearKeyCache, } from './crypto-utils'; import { secureStorage, isSecureStorageAvailable } from './secure-storage'; // Storage keys const CHAT_DATA_KEY = 'zclaw_chat_data'; const CHAT_KEY_IDENTIFIER = 'zclaw_chat_master_key'; const CHAT_KEY_HASH_KEY = 'zclaw_chat_key_hash'; const ENCRYPTED_PREFIX = 'enc_chat_'; // Encryption version for future migrations const STORAGE_VERSION = 1; /** * Storage metadata for integrity verification */ interface StorageMetadata { version: number; keyHash: string; createdAt: number; lastAccessedAt: number; encryptedAt: number; } /** * Encrypted storage container */ interface EncryptedContainer { metadata: StorageMetadata; data: string; // Encrypted payload } /** * Cached crypto key for chat encryption */ let cachedChatKey: CryptoKey | null = null; let keyHash: string | null = null; /** * Get or initialize the master encryption key for chat storage * Uses OS keychain when available, falls back to encrypted localStorage */ async function getOrCreateMasterKey(): Promise<string> { // Try to get existing key from secure storage const existingKey = await secureStorage.get(CHAT_KEY_IDENTIFIER); if (existingKey) { return existingKey; } // Generate new master key const newKey = generateMasterKey(); // Store in secure storage (keychain or encrypted localStorage) await secureStorage.set(CHAT_KEY_IDENTIFIER, newKey); // Store hash for integrity verification const keyHashValue = await hashSha256(newKey); localStorage.setItem(CHAT_KEY_HASH_KEY, keyHashValue); console.log('[EncryptedChatStorage] Generated new master key'); return newKey; } /** * Get the derived encryption key for chat data */ async function getChatEncryptionKey(): Promise<CryptoKey> { if (cachedChatKey && keyHash) { // Verify key hash matches const storedHash = localStorage.getItem(CHAT_KEY_HASH_KEY); if (storedHash === keyHash) { return cachedChatKey; } // Hash mismatch - clear cache and re-derive console.warn('[EncryptedChatStorage] Key hash mismatch, re-deriving key'); cachedChatKey = null; keyHash = null; } const masterKey = await getOrCreateMasterKey(); cachedChatKey = await deriveKey(masterKey); keyHash = await hashSha256(masterKey); return cachedChatKey; } /** * Initialize encrypted chat storage * Called during app startup */ export async function initializeEncryptedChatStorage(): Promise<void> { try { // Pre-load the encryption key await getChatEncryptionKey(); // Check if we have existing encrypted data to migrate const legacyData = localStorage.getItem('zclaw-chat-storage'); if (legacyData && !localStorage.getItem(ENCRYPTED_PREFIX + 'migrated')) { await migrateFromLegacyStorage(legacyData); localStorage.setItem(ENCRYPTED_PREFIX + 'migrated', 'true'); console.log('[EncryptedChatStorage] Migrated legacy data'); } console.log('[EncryptedChatStorage] Initialized successfully'); } catch (error) { console.error('[EncryptedChatStorage] Initialization failed:', error); throw error; } } /** * Migrate data from legacy unencrypted storage */ async function migrateFromLegacyStorage(legacyData: string): Promise<void> { try { const parsed = JSON.parse(legacyData); if (parsed?.state?.conversations) { await saveConversations(parsed.state.conversations); console.log(`[EncryptedChatStorage] Migrated ${parsed.state.conversations.length} conversations`); } } catch (error) { console.error('[EncryptedChatStorage] Migration failed:', error); } } /** * Save conversations to encrypted storage * * @param conversations - Array of conversation objects */ export async function saveConversations(conversations: unknown[]): Promise<void> { if (!conversations || conversations.length === 0) { return; } try { const key = await getChatEncryptionKey(); const now = Date.now(); // Create container with metadata const container: EncryptedContainer = { metadata: { version: STORAGE_VERSION, keyHash: keyHash || '', createdAt: now, lastAccessedAt: now, encryptedAt: now, }, data: '', // Will be set after encryption }; // Encrypt the conversations array const encrypted = await encryptObject(conversations, key); container.data = JSON.stringify(encrypted); // Store the encrypted container localStorage.setItem(CHAT_DATA_KEY, JSON.stringify(container)); console.log(`[EncryptedChatStorage] Saved ${conversations.length} conversations`); } catch (error) { console.error('[EncryptedChatStorage] Failed to save conversations:', error); throw error; } } /** * Load conversations from encrypted storage * * @returns Array of conversation objects or empty array if none exist */ export async function loadConversations<T = unknown>(): Promise<T[]> { try { const stored = localStorage.getItem(CHAT_DATA_KEY); if (!stored) { return []; } const container: EncryptedContainer = JSON.parse(stored); // Validate container structure if (!container.data || !container.metadata) { console.warn('[EncryptedChatStorage] Invalid container structure'); return []; } // Check version compatibility if (container.metadata.version > STORAGE_VERSION) { console.error('[EncryptedChatStorage] Incompatible storage version'); return []; } // Parse and decrypt the data const encryptedData = JSON.parse(container.data); if (!isValidEncryptedData(encryptedData)) { console.error('[EncryptedChatStorage] Invalid encrypted data'); return []; } const key = await getChatEncryptionKey(); const conversations = await decryptObject<T[]>(encryptedData, key); // Update last accessed time container.metadata.lastAccessedAt = Date.now(); localStorage.setItem(CHAT_DATA_KEY, JSON.stringify(container)); console.log(`[EncryptedChatStorage] Loaded ${conversations.length} conversations`); return conversations; } catch (error) { console.error('[EncryptedChatStorage] Failed to load conversations:', error); return []; } } /** * Delete all chat data from storage */ export async function clearAllChatData(): Promise<void> { try { // Clear encrypted data localStorage.removeItem(CHAT_DATA_KEY); localStorage.removeItem(ENCRYPTED_PREFIX + 'migrated'); // Clear the master key from secure storage await secureStorage.delete(CHAT_KEY_IDENTIFIER); localStorage.removeItem(CHAT_KEY_HASH_KEY); // Clear cached key cachedChatKey = null; keyHash = null; clearKeyCache(); console.log('[EncryptedChatStorage] Cleared all chat data'); } catch (error) { console.error('[EncryptedChatStorage] Failed to clear chat data:', error); throw error; } } /** * Export encrypted chat data for backup * Returns encrypted blob that can be imported later * * @returns Base64-encoded encrypted backup */ export async function exportEncryptedBackup(): Promise<string> { try { const stored = localStorage.getItem(CHAT_DATA_KEY); if (!stored) { throw new Error('No chat data to export'); } // The data is already encrypted, just return it const container: EncryptedContainer = JSON.parse(stored); const exportData = { type: 'zclaw_chat_backup', version: STORAGE_VERSION, exportedAt: Date.now(), container, }; return btoa(JSON.stringify(exportData)); } catch (error) { console.error('[EncryptedChatStorage] Export failed:', error); throw error; } } /** * Import encrypted chat data from backup * * @param backupData - Base64-encoded encrypted backup * @param merge - Whether to merge with existing data (default: false, replaces) */ export async function importEncryptedBackup( backupData: string, merge: boolean = false ): Promise<void> { try { const decoded = JSON.parse(atob(backupData)); // Validate backup format if (decoded.type !== 'zclaw_chat_backup') { throw new Error('Invalid backup format'); } if (decoded.version > STORAGE_VERSION) { throw new Error('Incompatible backup version'); } if (merge) { // Load existing conversations and merge const existing = await loadConversations(); const imported = await decryptObject<unknown[]>( JSON.parse(decoded.container.data), await getChatEncryptionKey() ); const merged = [...existing, ...imported]; await saveConversations(merged); } else { // Replace existing data localStorage.setItem(CHAT_DATA_KEY, JSON.stringify(decoded.container)); } console.log('[EncryptedChatStorage] Import completed successfully'); } catch (error) { console.error('[EncryptedChatStorage] Import failed:', error); throw error; } } /** * Check if encrypted storage is being used */ export async function isEncryptedStorageActive(): Promise<boolean> { const stored = localStorage.getItem(CHAT_DATA_KEY); if (!stored) { return false; } try { const container: EncryptedContainer = JSON.parse(stored); return container.metadata?.version === STORAGE_VERSION; } catch { return false; } } /** * Get storage statistics */ export async function getStorageStats(): Promise<{ encrypted: boolean; usingKeychain: boolean; conversationCount: number; storageSize: number; }> { const stored = localStorage.getItem(CHAT_DATA_KEY); let conversationCount = 0; let encrypted = false; if (stored) { try { const container: EncryptedContainer = JSON.parse(stored); encrypted = container.metadata?.version === STORAGE_VERSION; // Count conversations without full decryption const conversations = await loadConversations(); conversationCount = conversations.length; } catch { // Ignore parsing errors } } return { encrypted, usingKeychain: await isSecureStorageAvailable(), conversationCount, storageSize: stored ? new Blob([stored]).size : 0, }; } /** * Rotate encryption key * Re-encrypts all data with a new key */ export async function rotateEncryptionKey(): Promise<void> { try { // Load existing data const conversations = await loadConversations(); // Clear old key await secureStorage.delete(CHAT_KEY_IDENTIFIER); localStorage.removeItem(CHAT_KEY_HASH_KEY); cachedChatKey = null; keyHash = null; clearKeyCache(); // Generate new key (will be created on next getChatEncryptionKey call) const newKey = generateMasterKey(); await secureStorage.set(CHAT_KEY_IDENTIFIER, newKey); const newKeyHash = await hashSha256(newKey); localStorage.setItem(CHAT_KEY_HASH_KEY, newKeyHash); // Re-save all data with new key await saveConversations(conversations); console.log('[EncryptedChatStorage] Encryption key rotated successfully'); } catch (error) { console.error('[EncryptedChatStorage] Key rotation failed:', error); throw error; } } |