private async void OnStageChanged(object sender, SecondaryAuthenticationFactorAuthenticationStageChangedEventArgs e) { switch (e.StageInfo.Stage) { case SecondaryAuthenticationFactorAuthenticationStage.WaitingForUserConfirmation: // Show welcome message await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync( "", SecondaryAuthenticationFactorAuthenticationMessage.LookingForDevice); break; case SecondaryAuthenticationFactorAuthenticationStage.CollectingCredential: // TODO Authenticate device await DiscoverDevice(); break; case SecondaryAuthenticationFactorAuthenticationStage.CredentialAuthenticated: /*if (e.StageInfo.DeviceId == _deviceId) * { * // TODO Show notification on device about PC unlock * }*/ break; case SecondaryAuthenticationFactorAuthenticationStage.StoppingAuthentication: // TODO Quit from background task. SecondaryAuthenticationFactorAuthentication.AuthenticationStageChanged -= OnStageChanged; _exitEvent.Set(); break; case SecondaryAuthenticationFactorAuthenticationStage.SuspendingAuthentication: break; } }
// WARNING: Test code // This code should be in background task async void OnStageChanged(Object sender, SecondaryAuthenticationFactorAuthenticationStageChangedEventArgs args) { //ShowToastNotification("In StageChanged!" + args.StageInfo.Stage.ToString()); if (args.StageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.WaitingForUserConfirmation) { ShowToastNotification("Stage = WaitingForUserConfirmation"); // This event is happening on a ThreadPool thread, so we need to dispatch to the UI thread. // Getting the dispatcher from the MainView works as long as we only have one view. String deviceName = "DeviceSimulator."; await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync( deviceName, SecondaryAuthenticationFactorAuthenticationMessage.SwipeUpWelcome); } else if (args.StageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.CollectingCredential) { ShowToastNotification("Stage = CollectingCredential"); PerformAuthentication(); } else { if (args.StageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.StoppingAuthentication) { SecondaryAuthenticationFactorAuthentication.AuthenticationStageChanged -= OnStageChanged; opCompletedEvent.Set(); } SecondaryAuthenticationFactorAuthenticationStage stage = args.StageInfo.Stage; } }
async void OnStageChanged(Object sender, SecondaryAuthenticationFactorAuthenticationStageChangedEventArgs args) { //ShowToastNotification("In StageChanged!" + args.StageInfo.Stage.ToString()); if (args.StageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.CheckingDevicePresence) { Task t = PresenceMonitor(); t.Wait(); opCompletedEvent.Set(); deferral.Complete(); return; } if (args.StageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.WaitingForUserConfirmation) { //ShowToastNotification("Stage = WaitingForUserConfirmation"); // This event is happening on a ThreadPool thread, so we need to dispatch to the UI thread. // Getting the dispatcher from the MainView works as long as we only have one view. IReadOnlyList <SecondaryAuthenticationFactorInfo> deviceList = await SecondaryAuthenticationFactorRegistration.FindAllRegisteredDeviceInfoAsync( SecondaryAuthenticationFactorDeviceFindScope.User); String deviceName = deviceList.ElementAt(deviceList.Count() - 1).DeviceFriendlyName; string str = "\"" + deviceName + "\""; await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync( str, SecondaryAuthenticationFactorAuthenticationMessage.SwipeUpWelcome); } else if (args.StageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.CollectingCredential) { //ShowToastNotification("Stage = CollectingCredential"); System.Diagnostics.Debug.WriteLine("[OnStageChanged] Perform Auth / auth trigger"); try { Task t = PerformAuthentication();; await t; t = writeConnectedRegisteredDevices(); await t; } catch (Exception ex) { } finally { deferral.Complete(); } } else { if (args.StageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.StoppingAuthentication) { SecondaryAuthenticationFactorAuthentication.AuthenticationStageChanged -= OnStageChanged; opCompletedEvent.Set(); } SecondaryAuthenticationFactorAuthenticationStage stage = args.StageInfo.Stage; } }
private async Task DiscoverDevice() { var authStageInfo = await SecondaryAuthenticationFactorAuthentication.GetAuthenticationStageInfoAsync(); if (authStageInfo.Stage != SecondaryAuthenticationFactorAuthenticationStage.CollectingCredential) { return; // Bad status! } findAuth = true; var deviceList = await SecondaryAuthenticationFactorRegistration.FindAllRegisteredDeviceInfoAsync(SecondaryAuthenticationFactorDeviceFindScope.User); var db = new DatabaseContext(); var devicesInDb = db.Devices.ToList(); db.Dispose(); IPDiscover.DiscoverIP(); foreach (var device in deviceList) { var deviceInDb = devicesInDb.Find(d => d.DeviceId.ToString() == device.DeviceId); if (deviceInDb == null) { continue; } var session = new DeviceAuthSession { LastIP = deviceInDb.LastConnectedHost, MACAddress = deviceInDb.DeviceMacAddress, DeviceID = device.DeviceId, DeviceInDb = deviceInDb }; deviceSessions.Add(session); } while (findAuth) { foreach (var session in deviceSessions) { switch (session.Status) { case DeviceStatus.NotConnected: var payload = Convert.ToBase64String(Encoding.UTF8.GetBytes(session.DeviceID)); var data = Encoding.UTF8.GetBytes(DeviceDiscoverPrefix + payload); if (!string.IsNullOrWhiteSpace(session.LastIP)) { try { UDPListener.Send(session.LastIP, data); } catch (Exception) { // ignored } } var ips = session.FindIPs()?.ToList(); if ((ips == null || !ips.Any()) && string.IsNullOrWhiteSpace(session.MACAddress) && IPDiscover.IsDiscoveryCompleted) { session.Status = DeviceStatus.Unreachable; continue; } if (ips != null) { foreach (var ip in ips) { try { UDPListener.Send(ip, data); } catch (Exception) { // ignored } } } await UDPListener.Send(UDPListener.DeviceMulticastGroupAddress, data); break; case DeviceStatus.Unreachable: deviceSessions.Remove(session); break; case DeviceStatus.Established: findAuth = false; break; } } Thread.Sleep(1000); } Auth(deviceSessions.FirstOrDefault(s => s.Status == DeviceStatus.Established)); CurrentSession = null; }
private async void Auth(DeviceAuthSession session) { if (session == null) { await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync("", SecondaryAuthenticationFactorAuthenticationMessage.Invalid); return; } var deviceInDb = session.DeviceInDb; await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync(deviceInDb.DeviceFriendlyName, SecondaryAuthenticationFactorAuthenticationMessage.ReadyToSignIn); IBuffer svcAuthNonce = CryptographicBuffer.GenerateRandom(256 / 8); SecondaryAuthenticationFactorAuthenticationResult authResult = await SecondaryAuthenticationFactorAuthentication.StartAuthenticationAsync( session.DeviceID, svcAuthNonce); if (authResult.Status != SecondaryAuthenticationFactorAuthenticationStatus.Started) { var message = SecondaryAuthenticationFactorAuthenticationMessage.Invalid; switch (authResult.Status) { case SecondaryAuthenticationFactorAuthenticationStatus.DisabledByPolicy: message = SecondaryAuthenticationFactorAuthenticationMessage.DisabledByPolicy; break; case SecondaryAuthenticationFactorAuthenticationStatus.InvalidAuthenticationStage: break; default: return; } await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync(null, message); return; } var auth = authResult.Authentication; CurrentSession = session; for (int retries = 0; retries < 3; retries++) { var svcAuthHmac = auth.ServiceAuthenticationHmac; var deviceNonce = auth.DeviceNonce; var sessionNonce = auth.SessionNonce; var arr = new byte[3 + svcAuthHmac.Length + deviceNonce.Length + sessionNonce.Length]; arr[0] = (byte)svcAuthHmac.Length; arr[1] = (byte)deviceNonce.Length; arr[2] = (byte)sessionNonce.Length; Array.Copy(svcAuthHmac.ToArray(), 0, arr, 3, svcAuthHmac.Length); Array.Copy(deviceNonce.ToArray(), 0, arr, 3 + svcAuthHmac.Length, deviceNonce.Length); Array.Copy(sessionNonce.ToArray(), 0, arr, 3 + svcAuthHmac.Length + deviceNonce.Length, sessionNonce.Length); var payload = Convert.ToBase64String(arr); UDPListener.Send(session.LastIP, Encoding.UTF8.GetBytes(DeviceDiscoverPrefix + payload)); AuthResultReceivedEvent = new ManualResetEvent(false); try { AuthResultReceivedEvent.WaitOne(20000); } catch (Exception) { // ignored } var result = session.ResultBytes; if (result == null || result.Length <= 2 || result.Length != 2 + result[0] + result[1]) { return; /*await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync("", * SecondaryAuthenticationFactorAuthenticationMessage.TryAgain); * await auth.AbortAuthenticationAsync("No data got."); * continue;*/ } var deviceHmac = new Buffer(result[0]); var sessionHmac = new Buffer(result[1]); result.CopyTo(2, deviceHmac, 0, result[0]); result.CopyTo(2 + result[0], sessionHmac, 0, result[1]); var status = await auth.FinishAuthenticationAsync(deviceHmac, sessionHmac); switch (status) { case SecondaryAuthenticationFactorFinishAuthenticationStatus.Completed: // The credential data is collected and ready for unlock CurrentSession = null; return; default: await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync("", SecondaryAuthenticationFactorAuthenticationMessage.TryAgain); break; } } await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync(deviceInDb.DeviceFriendlyName, SecondaryAuthenticationFactorAuthenticationMessage.UnauthorizedUser); CurrentSession = null; }
private async Task PerformAuthentication() { string NanosATR = "3b00"; bool showNotificationFlag = true; string selector = SmartCardReader.GetDeviceSelector(); selector += " AND System.Devices.DeviceInstanceId:~~\"Ledger\""; DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(selector); foreach (DeviceInformation device in devices) { SmartCardReader reader = await SmartCardReader.FromIdAsync(device.Id); SmartCardReaderStatus readerstatus = await reader.GetStatusAsync(); //System.Diagnostics.Debug.WriteLine("Reader : " + reader.Name + " status : " + readerstatus.ToString()); IReadOnlyList <SmartCard> cards = await reader.FindAllCardsAsync(); foreach (SmartCard card in cards) { try { IBuffer ATR = await card.GetAnswerToResetAsync(); string ATR_str = CryptographicBuffer.EncodeToHexString(ATR); if (ATR_str.Equals(NanosATR)) { Task t = AuthenticateWithSmartCardAsync(card); await t; } } catch (CompanionDeviceNotFoundException ex) { ex.DisplayError(); break; } catch (UnableTogetNonceFromDeviceException ex) { ex.DisplayError(); showNotificationFlag = false; break; } catch (UnauthorizedUserException ex) { ex.DisplayError(); await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync( "", SecondaryAuthenticationFactorAuthenticationMessage.UnauthorizedUser); //ShowToastNotification("Wrong Response"); showNotificationFlag = false; break; } catch (LogInDeniedByUserException ex) { ex.DisplayError(); await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync( "", SecondaryAuthenticationFactorAuthenticationMessage.TryAgain); showNotificationFlag = false; break; } catch (Exception ex) { System.Diagnostics.Debug.WriteLine("[PerformAuthentication] Unhandled Exception / " + ex.Message); showNotificationFlag = false; return; } finally { } } } if (showNotificationFlag) { var loader = new Windows.ApplicationModel.Resources.ResourceLoader(); var str = loader.GetString("LookingForDevice"); await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync( str, SecondaryAuthenticationFactorAuthenticationMessage.LookingForDevicePluggedin); } showNotificationFlag = true; }
public async void Run(IBackgroundTaskInstance taskInstance) { deferral = taskInstance.GetDeferral(); StorageFolder folder = ApplicationData.Current.LocalFolder; //StorageFile logsFile = await folder.CreateFileAsync("BGtask.txt", CreationCollisionOption.OpenIfExists); //string txt = "[RUN]: " + DateTime.Now.ToString() + Environment.NewLine; //await FileIO.WriteTextAsync(logsFile, txt); // This event is signaled when the operation completes opCompletedEvent = new ManualResetEvent(false); SecondaryAuthenticationFactorAuthentication.AuthenticationStageChanged += OnStageChanged; //ShowToastNotification("BG Task Hit!"); if (taskInstance.TriggerDetails is DeviceWatcherTriggerDetails) { DeviceWatcherTriggerDetails triggerDetails = (DeviceWatcherTriggerDetails)taskInstance.TriggerDetails; foreach (DeviceWatcherEvent e in triggerDetails.DeviceWatcherEvents) { switch (e.Kind) { case DeviceWatcherEventKind.Add: Debug.WriteLine("[RUN] Add: " + e.DeviceInformation.Id); deferral = taskInstance.GetDeferral(); try { SecondaryAuthenticationFactorAuthenticationStageInfo authStageInfo = await SecondaryAuthenticationFactorAuthentication.GetAuthenticationStageInfoAsync(); SecondaryAuthenticationFactorAuthenticationStage stage = authStageInfo.Stage; //Debugger.Break(); if ((authStageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.WaitingForUserConfirmation) || (authStageInfo.Stage == SecondaryAuthenticationFactorAuthenticationStage.CollectingCredential)) { System.Diagnostics.Debug.WriteLine("[RUN] Perform Auth / plug trigger"); Task t = PerformAuthentication(); await t; } //Debugger.Break(); if (e.DeviceInformation.Name.Contains("Ledger")) { Task t = writeConnectedRegisteredDevices(); await t; } } catch (Exception ex) { } finally { deferral.Complete(); } break; //case DeviceWatcherEventKind.Update: // Debug.WriteLine("[RUN] Update: " + e.DeviceInformationUpdate.Id); // deferral = taskInstance.GetDeferral(); // // try // { // Task i = writeConnectedRegisteredDevices(); // await i; // } // catch (Exception ex) // { // Debugger.Break(); // } // finally // { // deferral.Complete(); // } // break; case DeviceWatcherEventKind.Remove: Debug.WriteLine("[RUN] Remove: " + e.DeviceInformationUpdate.Id); deferral = taskInstance.GetDeferral(); try { List <dLock> pluggedRegisteredDeviceListBeforeRemove = await readConnectedRegisteredDevices(); List <Tuple <string, bool, bool> > pluggedRegisteredDeviceListBeforeRemove_tuple = new List <Tuple <string, bool, bool> >(); foreach (dLock device in pluggedRegisteredDeviceListBeforeRemove) { Tuple <string, bool, bool> newElem = new Tuple <string, bool, bool>(device.DeviceId, device.isDlockEnabled, device.isUsedForLastLogin); pluggedRegisteredDeviceListBeforeRemove_tuple.Add(newElem); } IReadOnlyList <SecondaryAuthenticationFactorInfo> registeredDeviceList_removeEvent = await SecondaryAuthenticationFactorRegistration.FindAllRegisteredDeviceInfoAsync( SecondaryAuthenticationFactorDeviceFindScope.User); List <SecondaryAuthenticationFactorInfo> pluggedRegisteredDeviceListAfterRemove = await getConnectedRegisteredDeviceList(registeredDeviceList_removeEvent); foreach (SecondaryAuthenticationFactorInfo deviceToCheck in pluggedRegisteredDeviceListAfterRemove) { foreach (dLock device in pluggedRegisteredDeviceListBeforeRemove) { if (deviceToCheck.DeviceId == device.DeviceId) { var t = pluggedRegisteredDeviceListBeforeRemove_tuple.FirstOrDefault(i => i.Item1 == device.DeviceId); if (t != null) { // delete pluggedRegisteredDeviceListBeforeRemove_tuple.Remove(t); } } } } bool lockDevice = true; string deviceId = ""; for (int i = 0; i < pluggedRegisteredDeviceListBeforeRemove_tuple.Count(); i++) { deviceId = pluggedRegisteredDeviceListBeforeRemove_tuple[i].Item1; if ((!pluggedRegisteredDeviceListBeforeRemove_tuple[i].Item2) || (!pluggedRegisteredDeviceListBeforeRemove_tuple[i].Item3)) { lockDevice = false; } } if (lockDevice) { Task t = LockDevice(deviceId); await t; } await writeConnectedRegisteredDevices(); } catch (Exception ex) { } finally { deferral.Complete(); } break; } } } else { Debug.WriteLine("[RUN] Unknown trigger"); deferral = taskInstance.GetDeferral(); //try //{ // Task t = writeConnectedRegisteredDevices(); // await t; //} //catch (ConnectedRegisteredDevicesListTxtFileEmpty Ex) //{ //} //finally //{ // deferral.Complete(); //} } // Wait until the operation completes opCompletedEvent.WaitOne(); deferral.Complete(); }
private async Task AuthenticateWithSmartCardAsync(SmartCard card) { var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings; String m_selectedDeviceId = localSettings.Values["SelectedDevice"] as String; string m_selectedDeviceFriendlyName = string.Empty; string m_selectedDeviceAddDate = string.Empty; string deviceConfigString = string.Empty; char[] deviceConfigCharArray; byte[] deviceIdArray = new byte[16]; byte[] deviceDlockState = new byte[1]; bool foundCompanionDevice = false; byte[] response = { 0 }; string sw1sw2 = null; SecondaryAuthenticationFactorAuthenticationStageInfo authStageInfo = await SecondaryAuthenticationFactorAuthentication.GetAuthenticationStageInfoAsync(); if ((authStageInfo.Stage != SecondaryAuthenticationFactorAuthenticationStage.CollectingCredential) && (authStageInfo.Stage != SecondaryAuthenticationFactorAuthenticationStage.WaitingForUserConfirmation)) { throw new Exception("Unexpected! Stage: " + authStageInfo.Stage); } //ShowToastNotification("Post Collecting Credential"); System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Post Collecting Credential"); IReadOnlyList <SecondaryAuthenticationFactorInfo> deviceList = await SecondaryAuthenticationFactorRegistration.FindAllRegisteredDeviceInfoAsync( SecondaryAuthenticationFactorDeviceFindScope.AllUsers); if (deviceList.Count == 0) { //ShowToastNotification("Unexpected exception, device list = 0"); throw new Exception("Unexpected exception, device list = 0"); } SmartCardConnection connection = await card.ConnectAsync(); System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Connection"); response = await Apdu.TransmitApduAsync(connection, Apdu.getDeviceGuidCmdApdu); sw1sw2 = Apdu.ApduResponseParser(response, out response); deviceIdArray = response; string deviceId = BitConverter.ToString(response).Replace("-", ""); response = await Apdu.TransmitApduAsync(connection, Apdu.getDlockStateCmdApdu); sw1sw2 = Apdu.ApduResponseParser(response, out response); deviceDlockState = response; //string deviceFriendlyName = null; byte[] deviceConfigDataArray = new byte[18]; //16 bytes for GUID and 1 byte for dLockstate IBuffer deviceConfigData; byte[] deviceConfigurationDataArray; //List<byte[]> deviceConfigList = new List<byte[]>(); foreach (SecondaryAuthenticationFactorInfo device in deviceList) { CryptographicBuffer.CopyToByteArray(device.DeviceConfigurationData, out deviceConfigurationDataArray); //deviceConfigList.Add(deviceConfigurationDataArray); //deviceFriendlyName = device.DeviceFriendlyName; if (device.DeviceId == deviceId) { m_selectedDeviceId = deviceId; m_selectedDeviceFriendlyName = device.DeviceFriendlyName; deviceConfigString = CryptographicBuffer.ConvertBinaryToString(0, device.DeviceConfigurationData); //deviceConfigCharArray = new char[deviceConfigString.Count()]; //deviceConfigCharArray = deviceConfigString.ToCharArray(); int count = device.DeviceFriendlyName.Count(); m_selectedDeviceAddDate = deviceConfigString.Substring(35 + 1 + count + 1 + 1); foundCompanionDevice = true; //continue; } } //Debugger.Break(); if (!foundCompanionDevice) { throw new CompanionDeviceNotFoundException(); } System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Start Nonce APDU sending"); response = await Apdu.TransmitApduAsync(connection, Apdu.getNonceCmdApdu); sw1sw2 = Apdu.ApduResponseParser(response, out response); if (sw1sw2 != "9000") { throw new UnableTogetNonceFromDeviceException(); } System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Nonce APDU recieved without error"); string nonce = BitConverter.ToString(response).Replace("-", ""); IBuffer svcNonce = CryptographicBuffer.DecodeFromHexString(nonce); System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Start Authentication"); SecondaryAuthenticationFactorAuthenticationResult authResult = await SecondaryAuthenticationFactorAuthentication.StartAuthenticationAsync( m_selectedDeviceId, svcNonce); if (authResult.Status != SecondaryAuthenticationFactorAuthenticationStatus.Started) { //ShowToastNotification("Unexpected! Could not start authentication!"); throw new Exception("Unexpected! Could not start authentication! Status: " + authResult.Status); } byte[] devNonce = { 0 }; byte[] svcHmac = { 0 }; byte[] sessNonce = { 0 }; CryptographicBuffer.CopyToByteArray(authResult.Authentication.ServiceAuthenticationHmac, out svcHmac); CryptographicBuffer.CopyToByteArray(authResult.Authentication.SessionNonce, out sessNonce); CryptographicBuffer.CopyToByteArray(authResult.Authentication.DeviceNonce, out devNonce); byte[] cmd = new byte[Apdu.challengeCmdApdu.Length + svcHmac.Length + sessNonce.Length + devNonce.Length]; System.Buffer.BlockCopy(Apdu.challengeCmdApdu, 0, cmd, 0, Apdu.challengeCmdApdu.Length); System.Buffer.BlockCopy(svcHmac, 0, cmd, Apdu.challengeCmdApdu.Length, svcHmac.Length); System.Buffer.BlockCopy(sessNonce, 0, cmd, Apdu.challengeCmdApdu.Length + svcHmac.Length, sessNonce.Length); System.Buffer.BlockCopy(devNonce, 0, cmd, Apdu.challengeCmdApdu.Length + svcHmac.Length + sessNonce.Length, devNonce.Length); System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Send Challenge"); string str = "\"" + m_selectedDeviceFriendlyName + "\""; await SecondaryAuthenticationFactorAuthentication.ShowNotificationMessageAsync( str, SecondaryAuthenticationFactorAuthenticationMessage.DeviceNeedsAttention); response = await Apdu.TransmitApduAsync(connection, cmd); sw1sw2 = Apdu.ApduResponseParser(response, out response); if (sw1sw2 == "6985") { throw new UnauthorizedUserException(); } else if (sw1sw2 == "6984") { //ShowToastNotification("Log-in denied by user"); throw new LogInDeniedByUserException(); } System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Response recieved"); byte[] HMACdk = new byte[32]; byte[] HMACsk = new byte[32]; System.Buffer.BlockCopy(response, 0, HMACdk, 0, 32); System.Buffer.BlockCopy(response, 32, HMACsk, 0, 32); IBuffer deviceHmac = CryptographicBuffer.CreateFromByteArray(HMACdk); IBuffer sessionHmac = CryptographicBuffer.CreateFromByteArray(HMACsk); SecondaryAuthenticationFactorFinishAuthenticationStatus authStatus = await authResult.Authentication.FinishAuthenticationAsync(deviceHmac, sessionHmac); if (authStatus != SecondaryAuthenticationFactorFinishAuthenticationStatus.Completed) { //ShowToastNotification("Unable to complete authentication!"); System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Unable to complete authentication"); throw new Exception("Unable to complete authentication!"); } deviceConfigString = ""; if (deviceDlockState[0] == 0) { deviceConfigString = deviceId + "-0-1-" + m_selectedDeviceFriendlyName + "-" + m_selectedDeviceAddDate; } else { deviceConfigString = deviceId + "-1-1-" + m_selectedDeviceFriendlyName + "-" + m_selectedDeviceAddDate; } deviceConfigCharArray = new char[deviceConfigString.Count()]; deviceConfigString.CopyTo(0, deviceConfigCharArray, 0, deviceConfigString.Count()); // because deviceConfigString is readonly deviceConfigCharArray[35] = '1'; // to indicate that device was not used for last login string deviceConfigStringNew = new string(deviceConfigCharArray); //Debugger.Break(); deviceConfigData = CryptographicBuffer.ConvertStringToBinary(deviceConfigStringNew, 0); await SecondaryAuthenticationFactorRegistration.UpdateDeviceConfigurationDataAsync(deviceId, deviceConfigData); //update deviceConfigData foreach (SecondaryAuthenticationFactorInfo device in deviceList) { if (device.DeviceId != deviceId) { deviceConfigString = CryptographicBuffer.ConvertBinaryToString(0, device.DeviceConfigurationData); deviceConfigCharArray = new char[deviceConfigString.Count()]; deviceConfigString.CopyTo(0, deviceConfigCharArray, 0, deviceConfigString.Count()); // decause deviceConfigString is readonly deviceConfigCharArray[35] = '0'; // to indicate that device was not used for last login deviceConfigStringNew = new string(deviceConfigCharArray); deviceConfigData = CryptographicBuffer.ConvertStringToBinary(deviceConfigStringNew, 0); //Debugger.Break(); await SecondaryAuthenticationFactorRegistration.UpdateDeviceConfigurationDataAsync(device.DeviceId, deviceConfigData); //update deviceConfigData } } System.Diagnostics.Debug.WriteLine("[AuthenticateWithSmartCardAsync] Auth completed"); connection.Dispose(); }
async void PerformAuthentication() { ShowToastNotification("Performing Auth!"); //Get the selected device from app settings var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings; String m_selectedDeviceId = localSettings.Values["SelectedDevice"] as String; SecondaryAuthenticationFactorAuthenticationStageInfo authStageInfo = await SecondaryAuthenticationFactorAuthentication.GetAuthenticationStageInfoAsync(); if (authStageInfo.Stage != SecondaryAuthenticationFactorAuthenticationStage.CollectingCredential) { ShowToastNotification("Unexpected!"); throw new Exception("Unexpected!"); } ShowToastNotification("Post Collecting Credential"); IReadOnlyList <SecondaryAuthenticationFactorInfo> deviceList = await SecondaryAuthenticationFactorRegistration.FindAllRegisteredDeviceInfoAsync( SecondaryAuthenticationFactorDeviceFindScope.AllUsers); if (deviceList.Count == 0) { ShowToastNotification("Unexpected exception, device list = 0"); throw new Exception("Unexpected exception, device list = 0"); } ShowToastNotification("Found companion devices"); SecondaryAuthenticationFactorInfo deviceInfo = deviceList.ElementAt(0); m_selectedDeviceId = deviceInfo.DeviceId; ShowToastNotification("Device ID: " + m_selectedDeviceId); //a nonce is an arbitrary number that may only be used once - a random or pseudo-random number issued in an authentication protocol to ensure that old communications cannot be reused in replay attacks. IBuffer svcNonce = CryptographicBuffer.GenerateRandom(32); //Generate a nonce and do a HMAC operation with the nonce //In real world, you would need to take this nonce and send to companion device to perform an HMAC operation with it //You will have only 20 second to get the HMAC from the companion device SecondaryAuthenticationFactorAuthenticationResult authResult = await SecondaryAuthenticationFactorAuthentication.StartAuthenticationAsync( m_selectedDeviceId, svcNonce); if (authResult.Status != SecondaryAuthenticationFactorAuthenticationStatus.Started) { ShowToastNotification("Unexpected! Could not start authentication!"); throw new Exception("Unexpected! Could not start authentication!"); } ShowToastNotification("Auth Started"); // // WARNING: Test code // The HAMC calculation SHOULD be done on companion device // byte[] combinedDataArray; CryptographicBuffer.CopyToByteArray(authResult.Authentication.DeviceConfigurationData, out combinedDataArray); byte[] deviceKeyArray = new byte[32]; byte[] authKeyArray = new byte[32]; for (int index = 0; index < deviceKeyArray.Length; index++) { deviceKeyArray[index] = combinedDataArray[index]; } for (int index = 0; index < authKeyArray.Length; index++) { authKeyArray[index] = combinedDataArray[deviceKeyArray.Length + index]; } // Create device key and authentication key IBuffer deviceKey = CryptographicBuffer.CreateFromByteArray(deviceKeyArray); IBuffer authKey = CryptographicBuffer.CreateFromByteArray(authKeyArray); // Calculate the HMAC MacAlgorithmProvider hMACSha256Provider = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha256); CryptographicKey deviceHmacKey = hMACSha256Provider.CreateKey(deviceKey); IBuffer deviceHmac = CryptographicEngine.Sign(deviceHmacKey, authResult.Authentication.DeviceNonce); // sessionHmac = HMAC(authKey, deviceHmac || sessionNonce) IBuffer sessionHmac; byte[] deviceHmacArray = { 0 }; CryptographicBuffer.CopyToByteArray(deviceHmac, out deviceHmacArray); byte[] sessionNonceArray = { 0 }; CryptographicBuffer.CopyToByteArray(authResult.Authentication.SessionNonce, out sessionNonceArray); combinedDataArray = new byte[deviceHmacArray.Length + sessionNonceArray.Length]; for (int index = 0; index < deviceHmacArray.Length; index++) { combinedDataArray[index] = deviceHmacArray[index]; } for (int index = 0; index < sessionNonceArray.Length; index++) { combinedDataArray[deviceHmacArray.Length + index] = sessionNonceArray[index]; } // Get a Ibuffer from combinedDataArray IBuffer sessionMessage = CryptographicBuffer.CreateFromByteArray(combinedDataArray); // Calculate sessionHmac CryptographicKey authHmacKey = hMACSha256Provider.CreateKey(authKey); sessionHmac = CryptographicEngine.Sign(authHmacKey, sessionMessage); ShowToastNotification("Before finish auth"); SecondaryAuthenticationFactorFinishAuthenticationStatus authStatus = await authResult.Authentication.FinishAuthenticationAsync(deviceHmac, sessionHmac); if (authStatus != SecondaryAuthenticationFactorFinishAuthenticationStatus.Completed) { ShowToastNotification("Unable to complete authentication!"); throw new Exception("Unable to complete authentication!"); } ShowToastNotification("Auth completed"); }