feat: Implementieren der Verschlüsselungs- und Entschlüsselungsdienste mit AES und Integration in die API

- Hinzufügen der `Encryptor`-Klasse für AES-Verschlüsselung und -Entschlüsselung.
- Implementierung des `EncryptionController` zur Bereitstellung von Endpunkten für Verschlüsselung, Entschlüsselung und Generierung von Verschlüsselungsparametern.
- Erweiterung der DI-Konfiguration mit `AddEncryptor`-Erweiterungsmethode und Integration in `Program.cs`.
- Bedingte Registrierung des `EncryptionController` basierend auf der Konfiguration `UseEncryptor`, um sicherzustellen, dass der Controller nur bei Bedarf verfügbar ist.
- Implementierung von Lazy Loading für die Verbindungszeichenfolge in `UserManagerDbContext` zur sicheren Handhabung von verschlüsselten Verbindungszeichenfolgen.

DigitalData.UserManager.API/Controllers/EncryptionController.cs

@@ -0,0 +1,46 @@
+using DigitalData.UserManager.Application.Services;
+using DigitalData.UserManager.Application.Services.Options;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
+
+namespace DigitalData.UserManager.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class EncryptionController : ControllerBase
+    {
+        private readonly Encryptor _encryptor;
+
+        public EncryptionController(Encryptor encryptor)
+        {
+            _encryptor = encryptor;
+        }
+
+        [HttpPost("encrypt")]
+        public IActionResult Encrypt([FromQuery] string plainText, [FromBody] EncryptionParameters? options = null)
+        {
+            string cipherText = options is null 
+                ? _encryptor.Encrypt(plainText) 
+                : Encryptor.Encrypt(plainText, options.Key, options.IV);
+
+            return Ok(cipherText);
+        }
+
+        [HttpPost("decrypt")]
+        public IActionResult Decrypt([FromQuery] string cipherText, [FromBody] EncryptionParameters? options = null)
+        {
+            var plainText = options is null 
+                ? _encryptor.Decrypt(cipherText)
+                : Encryptor.Decrypt(cipherText, options.Key, options.IV);
+
+            return Ok(plainText);
+        }
+
+        [HttpGet]
+        public IActionResult Generate()
+        {
+            var param = Encryptor.GenerateParameters();
+            return Ok(param);
+        }
+    }
+}

DigitalData.UserManager.API/Program.cs

@@ -6,6 +6,9 @@ using Microsoft.AspNetCore.Authentication.Cookies;
 using NLog.Web;
 using NLog;
 using DigitalData.Core.API;
+using DigitalData.UserManager.API;
+using DigitalData.UserManager.API.Controllers;
+using DigitalData.UserManager.Application.Services;
 
 var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
 logger.Debug("init main");
@@ -13,6 +16,10 @@ logger.Debug("init main");
 try {
     var builder = WebApplication.CreateBuilder(args);
     
+    var config = builder.Configuration;
+
+    builder.Services.AddEncryptor(builder.Configuration.GetSection("EncryptionParameters"));
+
     if (builder.Configuration.GetValue<bool>("RunAsWindowsService"))
         builder.Host.UseWindowsService();
 
@@ -27,7 +34,12 @@ try {
         builder.Services.AddSwaggerGen();
     }
 
-    builder.Services.AddControllers();
+    builder.Services.AddControllers(opt =>
+    {
+        opt.Conventions.Add(new RemoveIfControllerConvention()
+            .AndIf(c => c.ControllerName == nameof(EncryptionController).Replace("Controller", ""))
+            .AndIf(c => !config.GetValue<bool>("UseEncryptor")));
+    });
 
     builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
         .AddCookie(options =>
@@ -39,9 +51,10 @@ try {
             options.LogoutPath = "/api/auth/logout";
         });
 
-    builder.Services.AddDbContext<UserManagerDbContext>(options =>
-        options.UseSqlServer(builder.Configuration.GetConnectionString("DD_ECM_Connection"))
-        .EnableDetailedErrors());
+    // Once the app is built, the password will be decrypted with Encryptor. lazy loading also acts as a call back method.
+    Lazy<string>? cnn_str = null;
+
+    builder.Services.AddDbContext<UserManagerDbContext>(options => options.UseSqlServer(cnn_str!.Value).EnableDetailedErrors());
 
     var allowedOrigins = builder.Configuration.GetSection("AllowedOrigins").Get<string[]>() ?? throw new InvalidOperationException("In appsettings there is no allowed origin.");
 
@@ -67,6 +80,14 @@ try {
     
     var app = builder.Build();
 
+    cnn_str = new(() =>
+    {
+        var encryptor = app.Services.GetRequiredService<Encryptor>();
+        var eCnnStr = config.GetConnectionString("DD_ECM_Connection") ?? throw new InvalidOperationException("Connection string 'DD_ECM_Connection' is missing from the configuration.");
+        var cnnStr = encryptor.Decrypt(eCnnStr);
+        return cnnStr;
+    });
+
     app.UseCors("DefaultCorsPolicy");
 
     if (builder.Configuration.GetValue<bool>("UseSwagger"))

DigitalData.UserManager.API/appsettings.Development.json

@@ -5,9 +5,6 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "ConnectionStrings": {
-    "DD_ECM_Connection": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"
-  },
   "AllowedOrigins": [ "http://localhost:4200" ],
   "Jwt": {
     "Key": "pJBcBWZSjsWlhi1OlCcw6ERTMRNb7qsdvsfvdfbagdfbdfsSDGSDMhsjkfdhsdfbgkHKSDF",

DigitalData.UserManager.API/appsettings.json

@@ -6,10 +6,9 @@
     }
   },
   "ConnectionStrings": {
-    "DD_ECM_Connection": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"
+    "DD_ECM_Connection": "cIFSoeMqHel7SDkAj4MWjy1UHrNJgoHrLkBJ/I/1Y95MsV9vFQjJLn6Shm9qtAyymwSNrX9s+78mW2PX4KulSA/KAaRwNQteP6SHrX0nNOJptot8TcohuiT0m9K2M/GsJEnLyJ+3yb0nJHR5yzRaVvjl8ERhgntW47dFMni98YA="
   },
-  "AllowedOrigins": [ "http://172.24.12.39:85", "http://localhost:85", "http://localhost:4200", "http://localhost:5500", "https://localhost:7202" ],
-  "UseSwagger": true,
+  "AllowedOrigins": [ "https://localhost:7103", "http://172.24.12.39:85", "http://localhost:85", "http://localhost:4200", "http://localhost:5500", "https://localhost:7202" ],
   "RunAsWindowsService": false,
   "DirectorySearchOptions": {
     "ServerName": "DD-VMP01-DC01",
@@ -67,5 +66,12 @@
         "writeTo": "criticalLogs"
       }
     ]
-  }
+  },
+  "EncryptionParameters": {
+    "Key": "JGPwHVD0BQmC7upi5OV11PzzIk47ugTJoqBV/et5w40=",
+    "IV": "gMuetIjlPvJnSzu+i7I3xg=="
+  },
+  // Delete below in production
+  "UseEncryptor": true,
+  "UseSwagger": true
 }

DigitalData.UserManager.Application/DIExtensions.cs

@@ -1,9 +1,11 @@
 using DigitalData.UserManager.Application.Contracts;
 using DigitalData.UserManager.Application.MappingProfiles;
 using DigitalData.UserManager.Application.Services;
+using DigitalData.UserManager.Application.Services.Options;
 using DigitalData.UserManager.Infrastructure.Contracts;
 using DigitalData.UserManager.Infrastructure.Repositories;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace DigitalData.UserManager.Application
@@ -40,5 +42,12 @@ namespace DigitalData.UserManager.Application
             .AddScoped<IModuleService, ModuleService>()
             .AddScoped<IModuleOfUserService, ModuleOfUserService>()
             .AddScoped<IUserRepService, UserRepService>();
+
+        public static IServiceCollection AddEncryptor(this IServiceCollection services, IConfiguration configuration)
+        {
+            services.AddSingleton<Encryptor>();
+            services.Configure<EncryptionParameters>(configuration);
+            return services;
+        }
     }
 }

DigitalData.UserManager.Application/DigitalData.UserManager.Application.csproj

@@ -28,6 +28,7 @@
     <PackageReference Include="DigitalData.Core.Application" Version="1.0.0" />
     <PackageReference Include="DigitalData.EmailProfilerDispatcher.Abstraction" Version="1.0.0" />
     <PackageReference Include="Microsoft.Extensions.Localization.Abstractions" Version="7.0.16" />
+    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="7.0.0" />
     <PackageReference Include="System.DirectoryServices" Version="7.0.1" />
     <PackageReference Include="System.DirectoryServices.AccountManagement" Version="7.0.1" />
     <PackageReference Include="System.DirectoryServices.Protocols" Version="7.0.1" />

DigitalData.UserManager.Application/Services/Encryptor.cs

@@ -0,0 +1,78 @@
+using DigitalData.UserManager.Application.Services.Options;
+using Microsoft.Extensions.Options;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace DigitalData.UserManager.Application.Services
+{
+    public class Encryptor
+    {
+        public const int KeyByteLength = 32;
+
+        private readonly EncryptionParameters _params;
+
+        public Encryptor(IOptions<EncryptionParameters> options)
+        {
+            _params = options.Value;
+        }
+
+        public string Encrypt(string plainText) => Encrypt(plainText, _params.Key, _params.IV);
+
+        public string Decrypt(string cipherText) => Decrypt(cipherText, _params.Key, _params.IV);
+
+        public static string Encrypt(string plainText, string key, string iv)
+        {
+            using Aes aes = Aes.Create();
+            aes.KeySize = KeyByteLength * 8;
+            aes.Key = AdjustKeySize(Encoding.UTF8.GetBytes(key), aes.KeySize / 8);
+            aes.IV = AdjustKeySize(Encoding.UTF8.GetBytes(iv), aes.BlockSize / 8);
+
+            ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
+
+            using MemoryStream ms = new();
+            using (CryptoStream cs = new(ms, encryptor, CryptoStreamMode.Write))
+            {
+                using StreamWriter sw = new(cs);
+                sw.Write(plainText);
+            }
+            return Convert.ToBase64String(ms.ToArray());
+        }
+
+        public static string Decrypt(string cipherText, string key, string iv)
+        {
+            using Aes aes = Aes.Create();
+            aes.KeySize = KeyByteLength * 8;
+            aes.Key = AdjustKeySize(Encoding.UTF8.GetBytes(key), aes.KeySize / 8);
+            aes.IV = AdjustKeySize(Encoding.UTF8.GetBytes(iv), aes.BlockSize / 8);
+
+            ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
+
+            using MemoryStream ms = new(Convert.FromBase64String(cipherText));
+            using CryptoStream cs = new(ms, decryptor, CryptoStreamMode.Read);
+            using StreamReader sr = new(cs);
+            return sr.ReadToEnd();
+        }
+
+        public static EncryptionParameters GenerateParameters()
+        {
+            using Aes aes = Aes.Create();
+            aes.KeySize = KeyByteLength * 8;
+            aes.GenerateKey();
+            aes.GenerateIV();
+            return new EncryptionParameters
+            {
+                Key = Convert.ToBase64String(aes.Key),
+                IV = Convert.ToBase64String(aes.IV)
+            };
+        }
+
+        private static byte[] AdjustKeySize(byte[] key, int size)
+        {
+            if (key.Length < size)
+                Array.Resize(ref key, size);
+            else if (key.Length > size)
+                Array.Resize(ref key, size);
+            return key;
+        }
+    }
+}

DigitalData.UserManager.Application/Services/Options/EncryptionParameters.cs

@@ -0,0 +1,9 @@
+namespace DigitalData.UserManager.Application.Services.Options
+{
+    public class EncryptionParameters
+    {
+        public required string Key { get; init; }
+
+        public required string IV { get; init; }
+    }
+}