OIDC Integration

watcher-monitoring/Configuration/OidcSettings.cs

@@ -0,0 +1,53 @@
+namespace watcher_monitoring.Configuration;
+
+public class OidcSettings
+{
+    public bool Enabled { get; set; } = false;
+
+    public string Authority { get; set; } = string.Empty;
+
+    public string ClientId { get; set; } = string.Empty;
+
+    public string ClientSecret { get; set; } = string.Empty;
+
+    public string Scopes { get; set; } = "openid profile email";
+
+    public string CallbackPath { get; set; } = "/signin-oidc";
+
+    public string ClaimUsername { get; set; } = "preferred_username";
+
+    public string ClaimEmail { get; set; } = "email";
+
+    public bool AutoProvisionUsers { get; set; } = true;
+
+    public bool IsValid => Enabled &&
+                           !string.IsNullOrWhiteSpace(Authority) &&
+                           !string.IsNullOrWhiteSpace(ClientId) &&
+                           !string.IsNullOrWhiteSpace(ClientSecret);
+
+    public string[] GetScopes() => Scopes.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+
+    public static OidcSettings FromEnvironment()
+    {
+        return new OidcSettings
+        {
+            Enabled = GetBoolEnv("OIDC_ENABLED", false),
+            Authority = Environment.GetEnvironmentVariable("OIDC_AUTHORITY") ?? string.Empty,
+            ClientId = Environment.GetEnvironmentVariable("OIDC_CLIENT_ID") ?? string.Empty,
+            ClientSecret = Environment.GetEnvironmentVariable("OIDC_CLIENT_SECRET") ?? string.Empty,
+            Scopes = Environment.GetEnvironmentVariable("OIDC_SCOPES") ?? "openid profile email",
+            CallbackPath = Environment.GetEnvironmentVariable("OIDC_CALLBACK_PATH") ?? "/signin-oidc",
+            ClaimUsername = Environment.GetEnvironmentVariable("OIDC_CLAIM_USERNAME") ?? "preferred_username",
+            ClaimEmail = Environment.GetEnvironmentVariable("OIDC_CLAIM_EMAIL") ?? "email",
+            AutoProvisionUsers = GetBoolEnv("OIDC_AUTO_PROVISION_USERS", true)
+        };
+    }
+
+    private static bool GetBoolEnv(string key, bool defaultValue)
+    {
+        var value = Environment.GetEnvironmentVariable(key);
+        if (string.IsNullOrWhiteSpace(value)) return defaultValue;
+        return value.Equals("true", StringComparison.OrdinalIgnoreCase) ||
+               value.Equals("1", StringComparison.OrdinalIgnoreCase);
+    }
+}

watcher-monitoring/Controllers/AuthController.cs

@@ -1,9 +1,11 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Authentication.OpenIdConnect;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using System.Security.Claims;
+using watcher_monitoring.Configuration;
 using watcher_monitoring.Data;
 using watcher_monitoring.Models;
 
@@ -13,11 +15,13 @@ public class AuthController : Controller
 {
     private readonly WatcherDbContext _context;
     private readonly ILogger<AuthController> _logger;
+    private readonly OidcSettings _oidcSettings;
 
-    public AuthController(WatcherDbContext context, ILogger<AuthController> logger)
+    public AuthController(WatcherDbContext context, ILogger<AuthController> logger, OidcSettings oidcSettings)
     {
         _context = context;
         _logger = logger;
+        _oidcSettings = oidcSettings;
     }
 
     [AllowAnonymous]
@@ -31,9 +35,138 @@ public class AuthController : Controller
         }
 
         ViewData["ReturnUrl"] = returnUrl;
+        ViewData["OidcEnabled"] = _oidcSettings.IsValid;
         return View();
     }
 
+    [AllowAnonymous]
+    [HttpGet]
+    public IActionResult OidcLogin(string? returnUrl = null)
+    {
+        if (!_oidcSettings.IsValid)
+        {
+            _logger.LogWarning("OIDC-Login versucht, aber OIDC ist nicht konfiguriert");
+            return RedirectToAction("Login");
+        }
+
+        var properties = new AuthenticationProperties
+        {
+            RedirectUri = Url.Action("OidcCallback", "Auth", new { returnUrl }),
+            Items = { { "returnUrl", returnUrl ?? "/" } }
+        };
+
+        return Challenge(properties, OpenIdConnectDefaults.AuthenticationScheme);
+    }
+
+    [AllowAnonymous]
+    [HttpGet]
+    public async Task<IActionResult> OidcCallback(string? returnUrl = null)
+    {
+        var authenticateResult = await HttpContext.AuthenticateAsync(OpenIdConnectDefaults.AuthenticationScheme);
+
+        if (!authenticateResult.Succeeded)
+        {
+            _logger.LogWarning("OIDC-Authentifizierung fehlgeschlagen: {Failure}", authenticateResult.Failure?.Message);
+            TempData["Error"] = "OIDC-Anmeldung fehlgeschlagen. Bitte versuchen Sie es erneut.";
+            return RedirectToAction("Login");
+        }
+
+        var oidcClaims = authenticateResult.Principal?.Claims;
+        var oidcSubject = oidcClaims?.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value
+                       ?? oidcClaims?.FirstOrDefault(c => c.Type == "sub")?.Value;
+
+        if (string.IsNullOrEmpty(oidcSubject))
+        {
+            _logger.LogError("OIDC-Claims enthalten keine Subject-ID");
+            TempData["Error"] = "OIDC-Anmeldung fehlgeschlagen: Keine Benutzer-ID erhalten.";
+            return RedirectToAction("Login");
+        }
+
+        var username = oidcClaims?.FirstOrDefault(c => c.Type == _oidcSettings.ClaimUsername)?.Value
+                    ?? oidcClaims?.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value
+                    ?? oidcClaims?.FirstOrDefault(c => c.Type == "name")?.Value
+                    ?? oidcSubject;
+
+        var email = oidcClaims?.FirstOrDefault(c => c.Type == _oidcSettings.ClaimEmail)?.Value
+                 ?? oidcClaims?.FirstOrDefault(c => c.Type == ClaimTypes.Email)?.Value
+                 ?? $"{username}@oidc.local";
+
+        var user = await _context.Users.FirstOrDefaultAsync(u => u.OidcSubject == oidcSubject);
+
+        if (user == null)
+        {
+            if (!_oidcSettings.AutoProvisionUsers)
+            {
+                _logger.LogWarning("OIDC-User {Subject} existiert nicht und Auto-Provisioning ist deaktiviert", oidcSubject);
+                TempData["Error"] = "Ihr Benutzerkonto existiert nicht. Bitte kontaktieren Sie den Administrator.";
+                return RedirectToAction("Login");
+            }
+
+            var existingUsername = await _context.Users.AnyAsync(u => u.Username == username);
+            if (existingUsername)
+            {
+                username = $"{username}_{oidcSubject[..Math.Min(8, oidcSubject.Length)]}";
+            }
+
+            user = new User
+            {
+                Username = username,
+                Email = email,
+                OidcSubject = oidcSubject,
+                Password = string.Empty,
+                IsActive = true,
+                CreatedAt = DateTime.UtcNow,
+                LastLogin = DateTime.UtcNow
+            };
+
+            _context.Users.Add(user);
+            await _context.SaveChangesAsync();
+            _logger.LogInformation("OIDC-User {Username} wurde automatisch erstellt (Subject: {Subject})", username, oidcSubject);
+        }
+        else
+        {
+            if (!user.IsActive)
+            {
+                _logger.LogWarning("OIDC-User {Username} ist deaktiviert", user.Username);
+                TempData["Error"] = "Ihr Benutzerkonto ist deaktiviert.";
+                return RedirectToAction("Login");
+            }
+
+            user.LastLogin = DateTime.UtcNow;
+            user.Email = email;
+            await _context.SaveChangesAsync();
+        }
+
+        var claims = new List<Claim>
+        {
+            new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
+            new Claim(ClaimTypes.Name, user.Username),
+            new Claim(ClaimTypes.Email, user.Email),
+            new Claim("LastLogin", user.LastLogin.ToString("o")),
+            new Claim("AuthMethod", "OIDC")
+        };
+
+        var claimsIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
+        var claimsPrincipal = new ClaimsPrincipal(claimsIdentity);
+
+        var authProperties = new AuthenticationProperties
+        {
+            IsPersistent = true,
+            ExpiresUtc = DateTimeOffset.UtcNow.AddHours(8)
+        };
+
+        await HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, claimsPrincipal, authProperties);
+
+        _logger.LogInformation("OIDC-User {Username} erfolgreich angemeldet", user.Username);
+
+        if (!string.IsNullOrEmpty(returnUrl) && Url.IsLocalUrl(returnUrl))
+        {
+            return Redirect(returnUrl);
+        }
+
+        return RedirectToAction("Index", "Home");
+    }
+
     [AllowAnonymous]
     [HttpPost]
     [ValidateAntiForgeryToken]

watcher-monitoring/Migrations/20260121084748_AddOidcSubjectToUser.Designer.cs

@@ -0,0 +1,181 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using watcher_monitoring.Data;
+
+#nullable disable
+
+namespace watcher_monitoring.Migrations
+{
+    [DbContext(typeof(WatcherDbContext))]
+    [Migration("20260121084748_AddOidcSubjectToUser")]
+    partial class AddOidcSubjectToUser
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "8.0.6");
+
+            modelBuilder.Entity("watcher_monitoring.Models.ApiKey", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Description")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime?>("ExpiresAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime?>("LastUsedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("ApiKeys");
+                });
+
+            modelBuilder.Entity("watcher_monitoring.Models.Container", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("ContainerName")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Containers");
+                });
+
+            modelBuilder.Entity("watcher_monitoring.Models.Server", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("CpuCores")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("CpuType")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("DiskSpace")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("GpuType")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("IPAddress")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("IsOnline")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<bool>("IsVerified")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("LastSeen")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<double>("RamSize")
+                        .HasColumnType("REAL");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Servers");
+                });
+
+            modelBuilder.Entity("watcher_monitoring.Models.User", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Email")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("LastLogin")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("OidcSubject")
+                        .HasMaxLength(255)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Password")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Username")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("watcher_monitoring.Models.ApiKey", b =>
+                {
+                    b.HasOne("watcher_monitoring.Models.User", "User")
+                        .WithMany("ApiKeys")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("watcher_monitoring.Models.User", b =>
+                {
+                    b.Navigation("ApiKeys");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

watcher-monitoring/Migrations/20260121084748_AddOidcSubjectToUser.cs

@@ -0,0 +1,40 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace watcher_monitoring.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddOidcSubjectToUser : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "OidcSubject",
+                table: "Users",
+                type: "TEXT",
+                maxLength: 255,
+                nullable: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Users_OidcSubject",
+                table: "Users",
+                column: "OidcSubject",
+                unique: true,
+                filter: "OidcSubject IS NOT NULL");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Users_OidcSubject",
+                table: "Users");
+
+            migrationBuilder.DropColumn(
+                name: "OidcSubject",
+                table: "Users");
+        }
+    }
+}

watcher-monitoring/Migrations/WatcherDbContextModelSnapshot.cs

@@ -139,6 +139,10 @@ namespace watcher_monitoring.Migrations
                     b.Property<DateTime>("LastLogin")
                         .HasColumnType("TEXT");
 
+                    b.Property<string>("OidcSubject")
+                        .HasMaxLength(255)
+                        .HasColumnType("TEXT");
+
                     b.Property<string>("Password")
                         .IsRequired()
                         .HasColumnType("TEXT");

watcher-monitoring/Models/User.cs

@@ -27,6 +27,11 @@ public class User
 
     public bool IsActive { get; set; } = true;
 
+    [StringLength(255)]
+    public string? OidcSubject { get; set; }
+
+    public bool IsOidcUser => !string.IsNullOrEmpty(OidcSubject);
+
     // Navigation Property: Ein User kann mehrere API-Keys haben
     public ICollection<ApiKey> ApiKeys { get; set; } = new List<ApiKey>();
 }

watcher-monitoring/Program.cs

@@ -1,10 +1,13 @@
 using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Authentication.OpenIdConnect;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.IdentityModel.Protocols.OpenIdConnect;
 using Microsoft.OpenApi.Models;
 
 using Serilog;
 
+using watcher_monitoring.Configuration;
 using watcher_monitoring.Data;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -27,6 +30,10 @@ builder.Host.UseSerilog();
 DotNetEnv.Env.Load();
 builder.Configuration.AddEnvironmentVariables();
 
+// OIDC-Einstellungen laden
+var oidcSettings = OidcSettings.FromEnvironment();
+builder.Services.AddSingleton(oidcSettings);
+
 // Konfiguration laden
 var configuration = builder.Configuration;
 
@@ -44,7 +51,7 @@ builder.Services.AddDbContext<WatcherDbContext>((serviceProvider, options) =>
 builder.Services.AddControllersWithViews();
 
 // Cookie-basierte Authentifizierung
-builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
+var authBuilder = builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
     .AddCookie(options =>
     {
         options.LoginPath = "/Auth/Login";
@@ -57,6 +64,36 @@ builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationSc
         options.Cookie.SameSite = SameSiteMode.Lax;
     });
 
+// OIDC-Authentifizierung (wenn aktiviert)
+if (oidcSettings.IsValid)
+{
+    Log.Information("OIDC-Authentifizierung aktiviert für Authority: {Authority}", oidcSettings.Authority);
+    authBuilder.AddOpenIdConnect(OpenIdConnectDefaults.AuthenticationScheme, options =>
+    {
+        options.Authority = oidcSettings.Authority;
+        options.ClientId = oidcSettings.ClientId;
+        options.ClientSecret = oidcSettings.ClientSecret;
+        options.ResponseType = OpenIdConnectResponseType.Code;
+        options.SaveTokens = true;
+        options.GetClaimsFromUserInfoEndpoint = true;
+        options.CallbackPath = oidcSettings.CallbackPath;
+        options.SignedOutCallbackPath = "/signout-callback-oidc";
+
+        options.Scope.Clear();
+        foreach (var scope in oidcSettings.GetScopes())
+        {
+            options.Scope.Add(scope);
+        }
+
+        options.TokenValidationParameters.NameClaimType = oidcSettings.ClaimUsername;
+        options.TokenValidationParameters.RoleClaimType = "roles";
+    });
+}
+else if (oidcSettings.Enabled)
+{
+    Log.Warning("OIDC ist aktiviert aber nicht korrekt konfiguriert. Erforderlich: OIDC_AUTHORITY, OIDC_CLIENT_ID, OIDC_CLIENT_SECRET");
+}
+
 builder.Services.AddAuthorization();
 
 // Health Checks

watcher-monitoring/Views/Auth/Login.cshtml

@@ -97,6 +97,21 @@
 
                 <button type="submit" class="btn btn-primary btn-login">Anmelden</button>
             </form>
+
+            @if (ViewData["OidcEnabled"] is true)
+            {
+                <hr class="my-4" />
+                <div class="text-center">
+                    <p class="text-muted mb-3">oder</p>
+                    <a href="@Url.Action("OidcLogin", "Auth", new { returnUrl = ViewData["ReturnUrl"] })" class="btn btn-outline-secondary w-100">
+                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-shield-lock me-2" viewBox="0 0 16 16">
+                            <path d="M5.338 1.59a61 61 0 0 0-2.837.856.48.48 0 0 0-.328.39c-.554 4.157.726 7.19 2.253 9.188a10.7 10.7 0 0 0 2.287 2.233c.346.244.652.42.893.533q.18.085.293.118a1 1 0 0 0 .101.025 1 1 0 0 0 .1-.025q.114-.034.294-.118c.24-.113.547-.29.893-.533a10.7 10.7 0 0 0 2.287-2.233c1.527-1.997 2.807-5.031 2.253-9.188a.48.48 0 0 0-.328-.39c-.651-.213-1.75-.56-2.837-.855C9.552 1.29 8.531 1.067 8 1.067c-.53 0-1.552.223-2.662.524zM5.072.56C6.157.265 7.31 0 8 0s1.843.265 2.928.56c1.11.3 2.229.655 2.887.87a1.54 1.54 0 0 1 1.044 1.262c.596 4.477-.787 7.795-2.465 9.99a11.8 11.8 0 0 1-2.517 2.453 7 7 0 0 1-1.048.625c-.28.132-.581.24-.829.24s-.548-.108-.829-.24a7 7 0 0 1-1.048-.625 11.8 11.8 0 0 1-2.517-2.453C1.928 10.487.545 7.169 1.141 2.692A1.54 1.54 0 0 1 2.185 1.43 63 63 0 0 1 5.072.56"/>
+                            <path d="M9.5 6.5a1.5 1.5 0 0 1-1 1.415l.385 1.99a.5.5 0 0 1-.491.595h-.788a.5.5 0 0 1-.49-.595l.384-1.99a1.5 1.5 0 1 1 2-1.415"/>
+                        </svg>
+                        Mit oidc anmelden
+                    </a>
+                </div>
+            }
         </div>
     </div>
 

watcher-monitoring/watcher-monitoring.csproj

@@ -17,6 +17,7 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.6" />
     <PackageReference Include="Serilog.AspNetCore" Version="9.0.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="8.0.11" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="9.0.6" />
   </ItemGroup>