Files
Termind/Frameworks/TermindRemoteInfrastructure/Security/KeychainSecretStore.swift
T

360 lines
14 KiB
Swift

import Foundation
import Security
import TermindApplication
import TermindDomain
public nonisolated enum KeychainSecretError: LocalizedError {
case status(OSStatus)
case invalidReference
case unexpectedValue
public var errorDescription: String? {
switch self {
case .status(let status):
(SecCopyErrorMessageString(status, nil) as String?)
?? String(localized: "Keychain error \(status)")
case .invalidReference:
String(localized: "The Keychain reference has the wrong credential type.")
case .unexpectedValue:
String(localized: "The Keychain item does not contain the expected credential type.")
}
}
}
/// The Vault's typed secret boundary. Keeping the store behind this small
/// interface lets connection tests prove password/passphrase lifetime rules
/// without depending on a signed Keychain-enabled test host.
/// Typed storage in the macOS Data Protection Keychain. Independent services
/// prevent a damaged reference from reinterpreting one credential as another.
public nonisolated struct KeychainSecretStore: SecretStoring, Sendable {
private static let passwordService = "com.akinokaede.termind.passwords.v1"
private static let softwareKeyService = "com.akinokaede.termind.ssh-software-keys.v1"
private static let enclaveService = "com.akinokaede.termind.secure-enclave-handles.v1"
private let accessGroup: String
public init(accessGroup: String) {
self.accessGroup = accessGroup
}
public func string(for account: String, storage: PasswordStorage) throws -> String? {
try validateStringReference(account)
guard
let data = try data(
for: account, service: Self.passwordService,
synchronizable: storage == .iCloud
)
else { return nil }
guard let value = String(data: data, encoding: .utf8) else {
throw KeychainSecretError.unexpectedValue
}
return value
}
public func containsString(for account: String, storage: PasswordStorage) throws -> Bool {
try validateStringReference(account)
return try contains(
account, service: Self.passwordService,
synchronizable: storage == .iCloud
)
}
public func sshSecret(for account: String, storage: PasswordStorage) throws -> SSHSecret? {
try validateStringReference(account)
guard
var data = try data(
for: account, service: Self.passwordService,
synchronizable: storage == .iCloud
)
else { return nil }
return SSHSecret(consumingUTF8: &data)
}
public func setString(_ value: String?, for account: String, storage: PasswordStorage) throws {
try validateStringReference(account)
var data = value?.data(using: .utf8)
defer {
if data != nil { SecretMemory.clear(&data!) }
}
try setData(
data, for: account, service: Self.passwordService,
synchronizable: storage == .iCloud,
accessible: storage == .iCloud
? kSecAttrAccessibleWhenUnlocked
: kSecAttrAccessibleWhenUnlockedThisDeviceOnly
)
}
public func keyCredential(for account: String, storage: KeyStorage) throws
-> StoredSSHKeyCredential?
{
try validate(account, prefix: "termind.key.")
guard
let data = try data(
for: account, service: service(for: storage),
synchronizable: storage == .iCloud
)
else { return nil }
switch storage {
case .thisDevice, .iCloud:
return .software(try JSONDecoder().decode(SSHPrivateKeySecret.self, from: data))
case .secureEnclave:
guard !data.isEmpty else { throw KeychainSecretError.unexpectedValue }
return .secureEnclave(SecureEnclaveKeyCredential(dataRepresentation: data))
}
}
public func containsKeyCredential(for account: String, storage: KeyStorage) throws -> Bool {
try validate(account, prefix: "termind.key.")
return try contains(
account, service: service(for: storage),
synchronizable: storage == .iCloud
)
}
public func sshKeyCredential(
for account: String, storage: KeyStorage
) throws -> SSHResolvedKeyCredential? {
try validate(account, prefix: "termind.key.")
guard
var data = try data(
for: account, service: service(for: storage),
synchronizable: storage == .iCloud
)
else { return nil }
defer { SecretMemory.clear(&data) }
switch storage {
case .thisDevice, .iCloud:
return .software(try Self.decodePrivateKeySecret(from: &data))
case .secureEnclave:
guard !data.isEmpty else { throw KeychainSecretError.unexpectedValue }
return .secureEnclave(SecureEnclaveKeyCredential(dataRepresentation: data))
}
}
public func setKeyCredential(
_ value: StoredSSHKeyCredential?, for account: String, storage: KeyStorage
) throws {
try validate(account, prefix: "termind.key.")
var data: Data?
switch (value, storage) {
case (.software(let secret), .thisDevice), (.software(let secret), .iCloud):
data = try JSONEncoder().encode(secret)
case (.secureEnclave(let credential), .secureEnclave):
data = credential.dataRepresentation
case (nil, _):
data = nil
default:
throw KeychainSecretError.unexpectedValue
}
defer {
if data != nil { SecretMemory.clear(&data!) }
}
try setData(
data, for: account, service: service(for: storage),
synchronizable: storage == .iCloud,
accessible: storage == .iCloud
? kSecAttrAccessibleWhenUnlocked
: kSecAttrAccessibleWhenUnlockedThisDeviceOnly
)
}
/// Strictly decodes the legacy single-field JSON envelope without creating
/// an immutable Swift `String` containing the private key. Corrupted shapes
/// fail closed instead of being searched for a matching field substring.
static func decodePrivateKeySecret(from data: inout Data) throws -> SSHSecret {
defer { SecretMemory.clear(&data) }
var index = data.startIndex
func skipWhitespace() {
while index < data.endIndex, [0x20, 0x09, 0x0A, 0x0D].contains(data[index]) {
index = data.index(after: index)
}
}
func consume(_ expected: UInt8) throws {
guard index < data.endIndex, data[index] == expected else {
throw KeychainSecretError.unexpectedValue
}
index = data.index(after: index)
}
skipWhitespace()
try consume(0x7B)
skipWhitespace()
for expected in Array("\"privateKey\"".utf8) {
try consume(expected)
}
skipWhitespace()
try consume(0x3A)
skipWhitespace()
try consume(0x22)
var result = Data()
defer { SecretMemory.clear(&result) }
while index < data.endIndex {
let byte = data[index]
index = data.index(after: index)
if byte == 0x22 {
skipWhitespace()
try consume(0x7D)
skipWhitespace()
guard index == data.endIndex else {
throw KeychainSecretError.unexpectedValue
}
return SSHSecret(consumingUTF8: &result)
}
guard byte == 0x5C else {
guard byte >= 0x20 else { throw KeychainSecretError.unexpectedValue }
result.append(byte)
continue
}
guard index < data.endIndex else { throw KeychainSecretError.unexpectedValue }
let escape = data[index]
index = data.index(after: index)
switch escape {
case 0x22, 0x5C, 0x2F: result.append(escape)
case 0x62: result.append(0x08)
case 0x66: result.append(0x0C)
case 0x6E: result.append(0x0A)
case 0x72: result.append(0x0D)
case 0x74: result.append(0x09)
case 0x75:
var value: UInt32 = 0
for _ in 0..<4 {
guard index < data.endIndex, let digit = hex(data[index]) else {
throw KeychainSecretError.unexpectedValue
}
value = value * 16 + UInt32(digit)
index = data.index(after: index)
}
guard let scalar = Unicode.Scalar(value), !(0xD800...0xDFFF).contains(value) else {
throw KeychainSecretError.unexpectedValue
}
result.append(contentsOf: String(scalar).utf8)
default:
throw KeychainSecretError.unexpectedValue
}
}
throw KeychainSecretError.unexpectedValue
}
private static func hex(_ byte: UInt8) -> UInt8? {
switch byte {
case 0x30...0x39: byte - 0x30
case 0x41...0x46: byte - 0x41 + 10
case 0x61...0x66: byte - 0x61 + 10
default: nil
}
}
public func removePassword(
_ account: String, storage: PasswordStorage = .thisDevice
) throws {
guard !account.isEmpty else { return }
try validate(account, prefix: "termind.password.")
try remove(
account, service: Self.passwordService,
synchronizable: storage == .iCloud
)
}
public func removeKeyCredential(_ account: String, storage: KeyStorage) throws {
guard !account.isEmpty else { return }
try validate(account, prefix: "termind.key.")
try remove(
account, service: service(for: storage),
synchronizable: storage == .iCloud
)
}
private func data(for account: String, service: String, synchronizable: Bool) throws
-> Data?
{
guard !account.isEmpty else { return nil }
var query = baseQuery(account, service: service, synchronizable: synchronizable)
query[kSecMatchLimit as String] = kSecMatchLimitOne
query[kSecReturnData as String] = true
var result: CFTypeRef?
let status = SecItemCopyMatching(query as CFDictionary, &result)
if status == errSecItemNotFound { return nil }
guard status == errSecSuccess else { throw KeychainSecretError.status(status) }
guard let data = result as? Data else { throw KeychainSecretError.unexpectedValue }
return data
}
private func contains(_ account: String, service: String, synchronizable: Bool) throws -> Bool {
guard !account.isEmpty else { return false }
var query = baseQuery(account, service: service, synchronizable: synchronizable)
query[kSecMatchLimit as String] = kSecMatchLimitOne
query[kSecReturnAttributes as String] = true
var result: CFTypeRef?
let status = SecItemCopyMatching(query as CFDictionary, &result)
if status == errSecItemNotFound { return false }
guard status == errSecSuccess else { throw KeychainSecretError.status(status) }
return true
}
private func setData(
_ value: Data?, for account: String, service: String,
synchronizable: Bool, accessible: CFString
) throws {
guard let value else {
try remove(account, service: service, synchronizable: synchronizable)
return
}
let match = baseQuery(account, service: service, synchronizable: synchronizable)
let attributes: [String: Any] = [
kSecValueData as String: value,
kSecAttrAccessible as String: accessible,
]
let updateStatus = SecItemUpdate(match as CFDictionary, attributes as CFDictionary)
if updateStatus == errSecSuccess { return }
guard updateStatus == errSecItemNotFound else {
throw KeychainSecretError.status(updateStatus)
}
var add = match
for (key, value) in attributes { add[key] = value }
let addStatus = SecItemAdd(add as CFDictionary, nil)
guard addStatus == errSecSuccess else { throw KeychainSecretError.status(addStatus) }
}
private func remove(_ account: String, service: String, synchronizable: Bool) throws {
let query = baseQuery(account, service: service, synchronizable: synchronizable)
let status = SecItemDelete(query as CFDictionary)
guard status == errSecSuccess || status == errSecItemNotFound else {
throw KeychainSecretError.status(status)
}
}
private func baseQuery(
_ account: String, service: String, synchronizable: Bool
) -> [String: Any] {
[
kSecClass as String: kSecClassGenericPassword,
kSecAttrService as String: service,
kSecAttrAccount as String: account,
kSecAttrAccessGroup as String: accessGroup,
kSecAttrSynchronizable as String: synchronizable,
kSecUseDataProtectionKeychain as String: true,
]
}
private func service(for storage: KeyStorage) -> String {
switch storage {
case .thisDevice, .iCloud: Self.softwareKeyService
case .secureEnclave: Self.enclaveService
}
}
private func validate(_ account: String, prefix: String) throws {
guard account.hasPrefix(prefix), account.count > prefix.count else {
throw KeychainSecretError.invalidReference
}
}
private func validateStringReference(_ account: String) throws {
let prefixes = ["termind.password.", "termind.ai."]
guard prefixes.contains(where: { account.hasPrefix($0) && account.count > $0.count })
else { throw KeychainSecretError.invalidReference }
}
}