BasicAuthentication als Attribut für Actions

AMWD.Common.AspNetCore/BasicAuthentication/BasicAuthenticationAttribute.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Net.Http.Headers;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Filters;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+
+namespace AMWD.Common.AspNetCore.BasicAuthentication
+{
+	/// <summary>
+	/// A basic authentication as attribute to use for specific actions.
+	/// </summary>
+	public class BasicAuthenticationAttribute : ActionFilterAttribute
+	{
+		private readonly ILogger<BasicAuthenticationAttribute> logger;
+		private readonly IServiceScopeFactory serviceScopeFactory;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="BasicAuthenticationAttribute"/> class.
+		/// </summary>
+		/// <param name="logger">A logger.</param>
+		/// <param name="serviceScopeFactory">A service scope factory.</param>
+		public BasicAuthenticationAttribute(ILogger<BasicAuthenticationAttribute> logger, IServiceScopeFactory serviceScopeFactory)
+		{
+			this.logger = logger;
+			this.serviceScopeFactory = serviceScopeFactory;
+		}
+
+		/// <summary>
+		/// Gets or sets a username to validate.
+		/// </summary>
+		public string Username { get; set; }
+
+		/// <summary>
+		/// Gets or sets a password to validate.
+		/// </summary>
+		public string Password { get; set; }
+
+		/// <summary>
+		/// Gets or sets a realm used on authentication header.
+		/// </summary>
+		public string Realm { get; set; }
+
+		/// <inheritdoc/>
+		public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
+		{
+			await DoValidation(context);
+			await base.OnActionExecutionAsync(context, next);
+		}
+
+		private async Task DoValidation(ActionExecutingContext context)
+		{
+			if (context.Result != null)
+				return;
+
+			if (context.HttpContext.Request.Headers.ContainsKey("Authorization"))
+			{
+				SetAuthenticateRequest(context);
+				return;
+			}
+
+			try
+			{
+				var authHeader = AuthenticationHeaderValue.Parse(context.HttpContext.Request.Headers["Authorization"]);
+				byte[] decoded = Convert.FromBase64String(authHeader.Parameter);
+				string plain = Encoding.UTF8.GetString(decoded);
+				string[] credentials = plain.Split(':', 2);
+
+				if (!string.IsNullOrWhiteSpace(Username) && !string.IsNullOrWhiteSpace(Password))
+				{
+					if (Username == credentials[0] && Password == credentials[1])
+						return;
+				}
+
+				using var scope = serviceScopeFactory.CreateScope();
+				var validator = scope.ServiceProvider.GetService<IBasicAuthenticationValidator>();
+
+				var principal = await validator?.ValidateAsync(credentials[0], credentials[1], context.HttpContext.GetRemoteIpAddress());
+				if (principal == null)
+					SetAuthenticateRequest(context);
+			}
+			catch (Exception ex)
+			{
+				logger.LogError(ex, $"Failed to execute the basic authentication attribute: {ex.Message}");
+				context.Result = new StatusCodeResult(StatusCodes.Status500InternalServerError);
+			}
+		}
+
+		private void SetAuthenticateRequest(ActionExecutingContext context)
+		{
+			context.HttpContext.Response.Headers["WWW-Authenticate"] = "Basic";
+			if (!string.IsNullOrWhiteSpace(Realm))
+				context.HttpContext.Response.Headers["WWW-Authenticate"] += $" realm=\"{Realm.Replace("\"", "")}\"";
+
+			context.Result = new UnauthorizedResult();
+		}
+	}
+}

AMWD.Common.AspNetCore/BasicAuthentication/BasicAuthenticationHandler.cs

@@ -4,12 +4,13 @@ using System.Security.Claims;
 using System.Text;
 using System.Text.Encodings.Web;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 
-namespace Microsoft.AspNetCore.Authentication
+namespace AMWD.Common.AspNetCore.BasicAuthentication
 {
 	/// <summary>
 	/// Implements the <see cref="AuthenticationHandler{TOptions}"/> for Basic Authentication.

AMWD.Common.AspNetCore/BasicAuthentication/BasicAuthenticationMiddleware.cs

@@ -2,29 +2,30 @@
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
 
-namespace Microsoft.AspNetCore.Http
+namespace AMWD.Common.AspNetCore.BasicAuthentication
 {
 	/// <summary>
 	/// Implements a basic authentication.
 	/// </summary>
-	public class BasicAuthMiddleware
+	public class BasicAuthenticationMiddleware
 	{
 		private readonly RequestDelegate next;
 		private readonly string realm;
-		private readonly Func<string, string, bool> userPasswordAuth;
+		private readonly IBasicAuthenticationValidator validator;
 
 		/// <summary>
-		/// Initializes a new instance of the <see cref="BasicAuthMiddleware"/> class.
+		/// Initializes a new instance of the <see cref="BasicAuthenticationMiddleware"/> class.
 		/// </summary>
 		/// <param name="next">The following delegate in the process chain.</param>
 		/// <param name="realm">The realm to display when requesting for credentials.</param>
-		/// <param name="userPasswordAuth">The function <c>(user, passwd) => result</c> to validate username and password.</param>
-		public BasicAuthMiddleware(RequestDelegate next, string realm, Func<string, string, bool> userPasswordAuth)
+		/// <param name="validator">A basic authentication validator.</param>
+		public BasicAuthenticationMiddleware(RequestDelegate next, string realm, IBasicAuthenticationValidator validator)
 		{
 			this.next = next;
 			this.realm = realm;
-			this.userPasswordAuth = userPasswordAuth;
+			this.validator = validator;
 		}
 
 		/// <summary>
@@ -41,18 +42,13 @@ namespace Microsoft.AspNetCore.Http
 				string encoded = ((string)authHeader).Split(' ', StringSplitOptions.RemoveEmptyEntries).LastOrDefault() ?? "";
 
 				string decoded = Encoding.UTF8.GetString(Convert.FromBase64String(encoded));
-				string[] parts = decoded.Split(':');
+				string[] parts = decoded.Split(':', 2);
 
-				if (parts.Length >= 2)
+				var principal = validator.ValidateAsync(parts[0], parts[1], httpContext.GetRemoteIpAddress());
+				if (principal != null)
 				{
-					string username = parts[0].Trim().ToLower();
-					string password = parts[1].Trim();
-
-					if (userPasswordAuth(username, password))
-					{
-						await next.Invoke(httpContext);
-						return;
-					}
+					await next.Invoke(httpContext);
+					return;
 				}
 			}
 

AMWD.Common.AspNetCore/BasicAuthentication/IBasicAuthenticationValidator.cs

@@ -2,7 +2,7 @@
 using System.Security.Claims;
 using System.Threading.Tasks;
 
-namespace Microsoft.AspNetCore.Authentication
+namespace AMWD.Common.AspNetCore.BasicAuthentication
 {
 	/// <summary>
 	/// Interface representing the validation of a basic authentication.

CHANGELOG.md

@@ -9,12 +9,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - CHANGELOG
 - `HtmlHelper.IsDarkColor` to classify a color as dark or light one (by luminance)
 - `ReadLine` and `ReadLineAsync` as `StreamExtensions`
+- `BasicAuthenticationHandler` to use instead of other handlers (instead of e.g. CookieAuthentication)
+- `BasicAuthenticationAttribute` to restrict single actions
 
 
 ### Changed
 - Unit-Tests enhanced
 - Unit-Tests excluded from code coverage calcualtion
 - Updated NuGet package `NetRevisionTask`
+- Changed NuGet package `DnsClient` to `DNS`
 
 
 ## [v1.1.0](https://git.am-wd.de/AM.WD/common/compare/v1.0.2...v1.1.0) - 2021-11-22