KeychainCoordinator.swift 6.5 KB

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  1. /*****************************************************************************
  2. * KeychainCoordinator.m
  3. * VLC for iOS
  4. *****************************************************************************
  5. * Copyright (c) 2017 VideoLAN. All rights reserved.
  6. * $Id$
  7. *
  8. * Authors:Carola Nitz <caro # videolan.org>
  9. *
  10. * Refer to the COPYING file of the official project for license.
  11. *****************************************************************************/
  12. import Foundation
  13. import LocalAuthentication
  14. @objc(VLCKeychainCoordinator)
  15. class KeychainCoordinator:NSObject, PAPasscodeViewControllerDelegate {
  16. @objc class var passcodeLockEnabled:Bool {
  17. return UserDefaults.standard.bool(forKey:kVLCSettingPasscodeOnKey)
  18. }
  19. //Since FaceID and TouchID are both set to 1 when the defaults are registered
  20. //we have to double check for the biometry type to not return true even though the setting is not visible
  21. //and that type is not supported by the device
  22. private var touchIDEnabled:Bool {
  23. var touchIDEnabled = UserDefaults.standard.bool(forKey:kVLCSettingPasscodeAllowTouchID)
  24. let laContext = LAContext()
  25. if #available(iOS 11.0.1, *), laContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil) {
  26. touchIDEnabled = touchIDEnabled && laContext.biometryType == .touchID
  27. }
  28. return touchIDEnabled
  29. }
  30. private var faceIDEnabled:Bool {
  31. var faceIDEnabled = UserDefaults.standard.bool(forKey:kVLCSettingPasscodeAllowFaceID)
  32. let laContext = LAContext()
  33. if #available(iOS 11.0.1, *), laContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil) {
  34. faceIDEnabled = faceIDEnabled && laContext.biometryType == .faceID
  35. }
  36. return faceIDEnabled
  37. }
  38. static let passcodeService = "org.videolan.vlc-ios.passcode"
  39. var completion: (() -> ())? = nil
  40. private var avoidPromptingTouchOrFaceID = false
  41. private lazy var passcodeLockController:PAPasscodeViewController = {
  42. let passcodeController = PAPasscodeViewController(for: PasscodeActionEnter)
  43. passcodeController!.delegate = self
  44. return passcodeController!
  45. }()
  46. override init() {
  47. super.init()
  48. NotificationCenter.default.addObserver(self, selector: #selector(appInForeground), name: .UIApplicationDidBecomeActive, object: nil)
  49. }
  50. @objc class func setPasscode(passcode:String?) throws {
  51. guard let passcode = passcode else {
  52. do {
  53. try XKKeychainGenericPasswordItem.removeItems(forService: passcodeService)
  54. } catch let error {
  55. throw error
  56. }
  57. return
  58. }
  59. let keychainItem = XKKeychainGenericPasswordItem()
  60. keychainItem.service = passcodeService
  61. keychainItem.account = passcodeService
  62. keychainItem.secret.stringValue = passcode
  63. do {
  64. try keychainItem.save()
  65. } catch let error {
  66. throw error
  67. }
  68. }
  69. @objc func validatePasscode(completion:@escaping ()->()) {
  70. passcodeLockController.passcode = passcodeFromKeychain()
  71. self.completion = completion
  72. guard let rootViewController = UIApplication.shared.delegate?.window??.rootViewController else {
  73. return
  74. }
  75. if rootViewController.presentedViewController != nil {
  76. rootViewController.dismiss(animated: false, completion: nil)
  77. }
  78. let navigationController = UINavigationController(rootViewController: passcodeLockController)
  79. navigationController.modalPresentationStyle = .fullScreen
  80. navigationController.modalTransitionStyle = .crossDissolve
  81. rootViewController.present(navigationController, animated: true) {
  82. [weak self] in
  83. if (self?.touchIDEnabled == true || self?.faceIDEnabled == true) {
  84. self?.touchOrFaceIDQuery()
  85. }
  86. }
  87. }
  88. @objc private func appInForeground(notification:Notification) {
  89. if let navigationController = UIApplication.shared.delegate?.window??.rootViewController?.presentedViewController as? UINavigationController, navigationController.topViewController is PAPasscodeViewController,
  90. touchIDEnabled || faceIDEnabled {
  91. touchOrFaceIDQuery()
  92. }
  93. }
  94. private func touchOrFaceIDQuery() {
  95. if (avoidPromptingTouchOrFaceID || UIApplication.shared.applicationState != .active) {
  96. return
  97. }
  98. let laContext = LAContext()
  99. if laContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil){
  100. avoidPromptingTouchOrFaceID = true
  101. laContext.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics,
  102. localizedReason: NSLocalizedString("BIOMETRIC_UNLOCK", comment: ""),
  103. reply: { [weak self ] success, _ in
  104. DispatchQueue.main.async {
  105. if success {
  106. UIApplication.shared.delegate?.window??.rootViewController?.dismiss(animated: true, completion: {
  107. self?.completion?()
  108. self?.completion = nil
  109. self?.avoidPromptingTouchOrFaceID = false
  110. })
  111. } else {
  112. //user hit cancel and wants to enter the passcode
  113. self?.avoidPromptingTouchOrFaceID = true
  114. }
  115. }
  116. })
  117. }
  118. }
  119. private func passcodeFromKeychain() -> String {
  120. if let item = try? XKKeychainGenericPasswordItem(forService: KeychainCoordinator.passcodeService, account: KeychainCoordinator.passcodeService) {
  121. return item.secret.stringValue
  122. }
  123. assert(false, "Couldn't retrieve item from Keychain! If passcodeLockEnabled we should have an item and secret")
  124. return ""
  125. }
  126. //MARK: PAPassCodeDelegate
  127. func paPasscodeViewControllerDidEnterPasscode(_ controller: PAPasscodeViewController!) {
  128. avoidPromptingTouchOrFaceID = false
  129. UIApplication.shared.delegate?.window??.rootViewController?.dismiss(animated: true, completion: {
  130. self.completion?()
  131. self.completion = nil
  132. })
  133. }
  134. }