Add YubiKey authentication functionality

src/XIVLauncher/Accounts/YubiAuth.cs

@@ -0,0 +1,138 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Serilog;
+using Yubico.YubiKey;
+using Yubico.YubiKey.Oath;
+using Yubico.PlatformInterop;
+
+namespace XIVLauncher.Accounts
+{
+    public class YubiAuth
+    {
+        private const string ISSUER = "XIVLauncher";
+        private const string ACCOUNT_NAME = "FFXIV";
+        private const CredentialType AUTH_TYPE = CredentialType.Totp;
+        private const CredentialPeriod TIME_PERIOD = CredentialPeriod.Period30;
+        private const byte NUM_DIGITS = 6;
+        private static string username = "";
+
+        private static IYubiKeyDevice _yubiKey;
+        public YubiKeyDeviceListener DeviceListener;
+        public YubiAuth()
+        {
+            FindYubiDevice();
+            DeviceListener = YubiKeyDeviceListener.Instance;
+        }
+
+        public static void SetUsername(string name)
+        {
+            username = name;
+        }
+        public static string GetUsername()
+        {
+            return username;
+        }
+        public string GetAccountName()
+        {
+            return ACCOUNT_NAME + "-" + username;
+        }
+
+        //Generates generic credential
+        public Credential BuildCredential()
+        {
+            var credentialTotp = new Credential
+            {
+                Issuer = ISSUER,
+                AccountName = GetAccountName(),
+                Type = AUTH_TYPE,
+                Period = TIME_PERIOD,
+                Digits = NUM_DIGITS,
+            };
+            return credentialTotp;
+        }
+
+        //Generates credential to be put onto user's YubiKey
+        public Credential BuildCredential(string key, bool useTouch)
+        {
+            var credentialTotp = new Credential
+            {
+                Issuer = ISSUER,
+                AccountName = GetAccountName(),
+                Type = AUTH_TYPE,
+                Period = TIME_PERIOD,
+                Secret = key,
+                Digits = NUM_DIGITS,
+                RequiresTouch = useTouch,
+            };
+            return credentialTotp;
+        }
+
+        //Finds YubiKey(s) that are plugged into a USB port
+        public void FindYubiDevice()
+        {
+            //Find YubiKey device
+            try
+            {
+                if (_yubiKey == null)
+                {
+                    IEnumerable<IYubiKeyDevice> keys = YubiKeyDevice.FindByTransport(Transport.UsbSmartCard);
+                    SetYubiDevice(keys.First());
+                }
+            }
+            catch (Exception ex) when (ex is ArgumentException || ex is InvalidOperationException)
+            {
+                Log.Debug("No YubiKey device was detected");
+                Log.Debug(ex.ToString());
+            }
+
+        }
+
+        public IYubiKeyDevice GetYubiDevice()
+        {
+            return _yubiKey;
+        }
+
+        public void SetYubiDevice(IYubiKeyDevice yubiKeyDevice)
+        {
+            _yubiKey = yubiKeyDevice;
+        }
+
+        //Checks for existing credentials on user's YubiKey that match the XIVLauncher generic credential
+        public bool CheckForCredential(OathSession session)
+        {
+            try
+            {
+                IList<Credential> creds = session.GetCredentials().Where(credential => credential.Issuer == ISSUER && credential.AccountName == GetAccountName()).ToList();
+                if (creds != null && creds.Count != 0)
+                {
+                    return true;
+                }
+                return false;
+            }
+            catch (SCardException)
+            {
+                Log.Error("YubiKey was removed during GET operation.");
+                return false;
+            }
+        }
+
+        //Adds the user's credential onto their YubiKey device
+        public void CreateEntry(Credential cred)
+        {
+            try
+            {
+                new OathSession(_yubiKey).AddCredential(cred);
+                Log.Debug("Successfully created new credential " + cred.Name);
+            }
+            catch (SCardException)
+            {
+                Log.Error("YubiKey was removed during ADD operation");
+            }
+
+        }
+
+    }
+
+
+}

src/XIVLauncher/Directory.Build.targets

@@ -0,0 +1,31 @@
+<Project>
+	<Choose>
+		<!-- If x86 architecture -->
+		<When Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture)' == 'X86' OR '$(Platform)' == 'x86'">
+			<ItemGroup>
+				<PackageReference Include="Yubico.NativeShims" Version="1.6.1">
+					<PrivateAssets>build</PrivateAssets>
+				</PackageReference>
+				<Content Include="$(NugetPackageRoot)\yubico.nativeshims\1.6.1\runtimes\win-x86\native\Yubico.NativeShims.dll">
+					<Link>Yubico.NativeShims.dll</Link>
+					<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+					<Visible>false</Visible>
+				</Content>
+			</ItemGroup>
+		</When>
+
+		<!-- If x64 architecture -->
+		<When Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture)' == 'X64' OR '$(Platform)' == 'x64'">
+			<ItemGroup>
+				<PackageReference Include="Yubico.NativeShims" Version="1.6.1">
+					<PrivateAssets>build</PrivateAssets>
+				</PackageReference>
+				<Content Include="$(NugetPackageRoot)\yubico.nativeshims\1.6.1\runtimes\win-x64\native\Yubico.NativeShims.dll">
+					<Link>Yubico.NativeShims.dll</Link>
+					<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+					<Visible>false</Visible>
+				</Content>
+			</ItemGroup>
+		</When>
+	</Choose>
+</Project>

src/XIVLauncher/Resources/LICENSE.txt

@@ -724,4 +724,5 @@ System.ValueTuple                         https://github.com/dotnet/corefx/blob/
 aria2                                     https://github.com/aria2/aria2/blob/master/COPYING                                     
 Spooky                                    https://github.com/Yortw/Spooky/blob/master/LICENSE                                    
 AriaNet                                   https://creativecommons.org/licenses/by-nc-sa/3.0/au/                                  
-SharedMemory                              https://github.com/spazzarama/SharedMemory/blob/master/LICENSE.md
+SharedMemory                              https://github.com/spazzarama/SharedMemory/blob/master/LICENSE.md
+Yubico.NET.SDK                            https://github.com/Yubico/Yubico.NET.SDK/blob/develop/LICENSE.txt

src/XIVLauncher/Settings/ILauncherSettingsV3.cs

@@ -21,6 +21,7 @@ public interface ILauncherSettingsV3
         bool InGameAddonEnabled { get; set; }
         DalamudLoadMethod? InGameAddonLoadMethod { get; set; }
         bool OtpServerEnabled { get; set; }
+        bool OtpYubiKeyEnabled { get; set; }
         ClientLanguage? Language { get; set; }
         LauncherLanguage? LauncherLanguage { get; set; }
         string CurrentAccountId { get; set; }