Initial commit

Projekte/WebDesktop/WebDesktopBackend/Security/Authentication/Constants/JwtTokenAuthentication.cs

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+namespace WebDesktopBackend.Security.Authentication
+{
+    public static class JwtTokenAuthentication
+    {
+        public const string Scheme = "JwtTokenAuthentication";
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/Authentication/Handler/JwtTokenAuthenticationExtensions.cs

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+using Microsoft.AspNetCore.Authentication;
+using Microsoft.Extensions.Configuration;
+using WebDesktopBackend.Options;
+
+namespace WebDesktopBackend.Security.Authentication
+{
+    public static class JwtTokenAuthenticationExtensions
+    {
+        public static AuthenticationBuilder AddJwtTokenAuthentication(this AuthenticationBuilder builder, IConfiguration configuration)
+        {
+            builder.Services.AddOptionsFromConfiguration<JwtTokenAuthenticationOptions>(configuration);
+
+            return builder.AddScheme<JwtTokenAuthenticationHandlerOptions, JwtTokenAuthenticationHandler>(
+                JwtTokenAuthentication.Scheme,
+                _ => { });
+        }
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/Authentication/Handler/JwtTokenAuthenticationHandler.cs

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+using Microsoft.AspNetCore.Authentication;
+using WebDesktopBackend.Entitys.Tokens;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using System.Text.Encodings.Web;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Claims;
+using WebDesktopBackend.Contract.Persistance;
+using WebDesktopBackend.Entitys.Permissions;
+using WebDesktopBackend.Security.Authorization;
+
+#pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
+
+namespace WebDesktopBackend.Security.Authentication
+{
+    public class JwtTokenAuthenticationHandler : AuthenticationHandler<JwtTokenAuthenticationHandlerOptions>
+    {
+        private readonly ITokenRepository _tokens;
+        private readonly IGroupRepository _groups;
+
+        public JwtTokenAuthenticationHandler(
+            IOptionsMonitor<JwtTokenAuthenticationHandlerOptions> options,
+            ILoggerFactory logger,
+            UrlEncoder encoder,
+            ISystemClock clock,
+            ITokenRepository tokens,
+            IGroupRepository groups)
+            : base(options, logger, encoder, clock)
+        {
+            _tokens = tokens;
+            _groups = groups;
+        }
+
+        protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
+        {
+            var accessToken = GetAccessToken();
+            if (accessToken == null) return AuthenticateResult.Fail("Access Token invalid");
+            var refreshToken = _tokens.GetRefreshToken(accessToken.RefreshTokenId);
+            if (refreshToken == null) return AuthenticateResult.Fail("Refresh Token invalid");
+            if (!_tokens.ValidateRefreshToken(refreshToken.Id)) return AuthenticateResult.Fail("Refresh Token invalid");
+            bool valid = _tokens.ValidateAccessToken(accessToken.Id);
+            return valid ? 
+                        AuthenticateResult.Success(GetAuthenticationTicket(accessToken, refreshToken)) : 
+                        AuthenticateResult.Fail("Access Token invalid");
+        }
+
+        private AuthenticationTicket GetAuthenticationTicket(AccessToken accessToken, RefreshToken refreshToken) {
+            List<Claim> claims = GenerateClaims(accessToken, refreshToken);
+            ClaimsPrincipal principal = new ClaimsPrincipal();
+            principal.AddIdentity(new ClaimsIdentity(claims, JwtTokenAuthentication.Scheme));
+            AuthenticationTicket ticket = new AuthenticationTicket(principal, Scheme.Name);
+            return ticket;
+        }
+
+        private List<Claim> GenerateClaims(AccessToken accessToken, RefreshToken refreshToken) {
+            List<Claim> claims = new List<Claim>() {
+                new (CustomClaimTypes.AccessTokenId, accessToken.Id),
+                new (CustomClaimTypes.RefreshTokenId, refreshToken.Id),
+                new (CustomClaimTypes.UserId, refreshToken.UserId),
+            };
+
+            Permission[] permissions = _groups.GetUserPermissions(refreshToken.UserId)
+                .Where(perm => perm.Type == Permission.Allow).ToArray();
+            claims.AddRange(permissions.Select(permission => new Claim(CustomClaimTypes.Permission, permission.PermissionName)));
+
+            return claims;
+        }
+
+        private AccessToken GetAccessToken() {
+            string key = Request.Headers["Authorization"];
+            if (string.IsNullOrEmpty(key)) {
+                key = Request.Query["token"];
+            }
+            AccessToken token = _tokens.GetAccessToken(key);
+            return token;
+        }
+    }
+}
+
+#pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously

Projekte/WebDesktop/WebDesktopBackend/Security/Authentication/Options/JwtTokenAuthenticationHandlerOptions.cs

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+using Microsoft.AspNetCore.Authentication;
+
+namespace WebDesktopBackend.Security.Authentication
+{
+    public class JwtTokenAuthenticationHandlerOptions : AuthenticationSchemeOptions
+    {
+        // Options for the authentication handler.
+        // Currently: None
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/Authentication/Options/JwtTokenAuthenticationOptions.cs

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+using WebDesktopBackend.Options;
+
+namespace WebDesktopBackend.Security.Authentication
+{
+    public class JwtTokenAuthenticationOptions : OptionsFromConfiguration
+    {
+        public override string Position => "JwtTokenAuthentication:Jwt";
+
+        public string RefreshTokenExpirationTimeInHours { get; set; }
+        public string AccessTokenExpirationTimeInMinutes { get; set; }
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/Authorization/Annotations/AuthorizedAttribute.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace WebDesktopBackend.Security.Authorization
+{
+    public sealed class AuthorizedAttribute : TypeFilterAttribute
+    {
+        public AuthorizedAttribute(params string[] permission) : base(typeof(AuthorizedFilter)) {
+            Arguments = new object[] { permission };
+        }
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/Authorization/Annotations/AuthorizedFilter.cs

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+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Authorization;
+using Microsoft.AspNetCore.Mvc.Filters;
+using System.Linq;
+
+namespace WebDesktopBackend.Security.Authorization
+{
+    public class AuthorizedFilter : IAuthorizationFilter
+    {
+        private readonly string[] _permissions;
+        
+        public AuthorizedFilter(params string[] permissions)
+        {
+            _permissions = permissions;
+        }
+        
+        public void OnAuthorization(AuthorizationFilterContext context)
+        {
+            if (EndpointHasAllowAnonymousFilter(context))
+            {
+                return;
+            }
+
+            if (!IsAuthenticated(context))
+            {
+                context.Result = new UnauthorizedResult();
+                return;
+            }
+            
+            if (!ContainsRequiredRole(context))
+            {
+                context.Result = new ForbidResult();
+                return;
+            }
+        }
+
+        private static bool EndpointHasAllowAnonymousFilter(AuthorizationFilterContext context)
+        {
+            return context.Filters.Any(item => item is IAllowAnonymousFilter);
+        }
+
+        private bool IsAuthenticated(AuthorizationFilterContext context)
+        {
+            return context.HttpContext.User.Identity.IsAuthenticated;
+        }
+        
+        private bool ContainsRequiredRole(AuthorizationFilterContext context) {
+            if (_permissions.Length == 0)
+                return true;
+            
+            if (context.HttpContext.User.HasClaim(CustomClaimTypes.Permission, "*"))
+                return true;
+
+            foreach (var permission in _permissions) {
+                string[] splice = permission.Split(".");
+                string cache = "";
+                foreach (var s in splice) {
+                    cache += s + ".";
+                    if (context.HttpContext.User.HasClaim(CustomClaimTypes.Permission, cache + "*"))
+                        return true;
+                }
+            }
+            
+            return false;
+        }
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/Authorization/Claims/ClaimsPrincipalExtensions.cs

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+using System.Linq;
+using System.Security.Claims;
+
+namespace WebDesktopBackend.Security.Authorization
+{
+    public static class ClaimsPrincipalExtensions
+    {
+        public static string GetAccessTokenId(this ClaimsPrincipal principal) => principal.FindFirstValue(CustomClaimTypes.AccessTokenId);
+        public static string GetRefreshTokenId(this ClaimsPrincipal principal) => principal.FindFirstValue(CustomClaimTypes.RefreshTokenId);
+        public static string GetUserId(this ClaimsPrincipal principal) => principal.FindFirstValue(CustomClaimTypes.UserId);
+
+        public static string[] GetPermissions(this ClaimsPrincipal principal) => principal.Claims
+            .Where(claim => claim.Type.Equals(CustomClaimTypes.Permission))
+            .Select(claim => claim.Value)
+            .ToArray();
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/Authorization/Claims/CustomClaimTypes.cs

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+namespace WebDesktopBackend.Security.Authorization
+{
+    public static class CustomClaimTypes
+    {
+        public const string AccessTokenId = "WebDesktop.AccessTokenId";
+        public const string RefreshTokenId = "WebDesktop.RefreshTokenId";
+        public const string UserId = "WebDesktop.UserId";
+        public const string Permission = "WebDesktop.Permission";
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/ITokenContext.cs

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+namespace WebDesktopBackend.Security
+{
+    public interface ITokenContext {
+        bool IsAuthenticated {get;}
+        string UserId {get;}
+        string AccessTokenId {get;}
+        string RefreshTokenId {get;}
+        string[] Permissions { get; }
+    }
+}

Projekte/WebDesktop/WebDesktopBackend/Security/TokenContext.cs

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+using Microsoft.AspNetCore.Http;
+using WebDesktopBackend.Security.Authorization;
+
+namespace WebDesktopBackend.Security
+{
+    internal class TokenContext : ITokenContext
+    {
+        private readonly IHttpContextAccessor _accessor;
+
+        public TokenContext(IHttpContextAccessor accessor) {
+            _accessor = accessor;
+        }
+
+        public bool IsAuthenticated => _accessor.HttpContext.User.Identity.IsAuthenticated;
+
+        public string UserId => _accessor.HttpContext?.User.GetUserId();
+
+        public string AccessTokenId => _accessor.HttpContext?.User.GetAccessTokenId();
+
+        public string RefreshTokenId => _accessor.HttpContext?.User.GetRefreshTokenId();
+
+        public string[] Permissions => _accessor.HttpContext?.User.GetPermissions();
+    }
+}