Initial commit

Backend/Security/Authentication/Constants/JwtTokenAuthentication.cs

@@ -0,0 +1,5 @@
+namespace Backend.Security.Authentication {
+    public static class JwtTokenAuthentication {
+        public const string Scheme = "JwtTokenAuthentication";
+    }
+}

Backend/Security/Authentication/Handler/JwtTokenAuthenticationExtensions.cs

@@ -0,0 +1,15 @@
+using Backend.Options;
+using Microsoft.AspNetCore.Authentication;
+
+namespace Backend.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,
+                _ => { });
+        }
+    }
+}

Backend/Security/Authentication/Handler/JwtTokenAuthenticationHandler.cs

@@ -0,0 +1,88 @@
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.Extensions.Options;
+using System.Text.Encodings.Web;
+using System.Security.Claims;
+using Backend.Entitys;
+using Backend.Repositorys;
+using Backend.Security.Authorization;
+
+#pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
+
+namespace Backend.Security.Authentication {
+    public class JwtTokenAuthenticationHandler : AuthenticationHandler<JwtTokenAuthenticationHandlerOptions> {
+        private readonly TokenRepository _tokens;
+        private readonly GroupRepository _groups;
+        private readonly JwtTokenAuthenticationOptions _options;
+
+        public JwtTokenAuthenticationHandler(
+            IOptionsMonitor<JwtTokenAuthenticationHandlerOptions> options,
+            ILoggerFactory logger,
+            UrlEncoder encoder,
+            ISystemClock clock,
+            IOptions<JwtTokenAuthenticationOptions> tokenOptions,
+            TokenRepository tokens,
+            GroupRepository groups)
+            : base(options, logger, encoder, clock) {
+            _options = tokenOptions.Value;
+            _tokens = tokens;
+            _groups = groups;
+        }
+
+        protected override async Task<AuthenticateResult> HandleAuthenticateAsync() {
+            if (Request.Headers["Authorization"].Equals(_options.DebugAccessToken))
+                return AuthenticateResult.Success(GetAuthenticationTicket(null, null, "*"));
+            
+            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, params string[] customPerms) {
+            List<Claim> claims = GenerateClaims(accessToken, refreshToken, customPerms);
+            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, params string[] customPerms) {
+            List<Claim> claims = new List<Claim>();
+            if (accessToken is not null && refreshToken is not null) {
+                claims.AddRange(new List<Claim> {
+                    new(CustomClaimTypes.AccessTokenId, accessToken.Id.ToString()),
+                    new(CustomClaimTypes.RefreshTokenId, refreshToken.Id.ToString()),
+                    new(CustomClaimTypes.UserId, refreshToken.UserId.ToString()),
+                });
+                
+                string[] permissions = _groups.GetUserPermissions(refreshToken.UserId).Select(perm => perm.PermissionKey).ToArray();
+                claims.AddRange(permissions
+                    .Select(permission => new Claim(CustomClaimTypes.Permission, permission)));
+            }
+
+            claims.AddRange(customPerms.Select(perm => new Claim(CustomClaimTypes.Permission, perm)));
+
+            return claims;
+        }
+
+        private AccessToken GetAccessToken() {
+            string key = Request.Headers["Authorization"];
+            if (string.IsNullOrEmpty(key)) {
+                key = Request.Query["token"];
+            }
+
+            if (string.IsNullOrEmpty(key))
+                return null;
+
+            AccessToken token = _tokens.GetAccessToken(Guid.Parse(key));
+            return token;
+        }
+    }
+}
+
+#pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously

Backend/Security/Authentication/Options/JwtTokenAuthenticationHandlerOptions.cs

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

Backend/Security/Authentication/Options/JwtTokenAuthenticationOptions.cs

@@ -0,0 +1,11 @@
+using Backend.Options;
+
+namespace Backend.Security.Authentication {
+    public class JwtTokenAuthenticationOptions : OptionsFromConfiguration {
+        public override string Position => "Authentication";
+
+        public string RefreshTokenExpirationTimeInHours { get; set; }
+        public string AccessTokenExpirationTimeInMinutes { get; set; }
+        public string DebugAccessToken { get; set; }
+    }
+}

Backend/Security/Authentication/Options/OptionsFromConfiguration.cs

@@ -0,0 +1,5 @@
+namespace Backend.Options {
+    public abstract class OptionsFromConfiguration {
+        public abstract string Position { get; }
+    }
+}

Backend/Security/Authentication/Options/OptionsFromConfigurationExtensions.cs

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+namespace Backend.Options {
+    public static class OptionsFromConfigurationExtensions {
+        public static T AddOptionsFromConfiguration<T>(this IServiceCollection services, IConfiguration configuration)
+            where T : OptionsFromConfiguration {
+            T optionsInstance = (T)Activator.CreateInstance(typeof(T));
+            if (optionsInstance == null) return null;
+            string position = optionsInstance.Position;
+            services.Configure((Action<T>)(options => {
+                IConfigurationSection section = configuration.GetSection(position);
+                if (section != null) {
+                    section.Bind(options);
+                }
+            }));
+            return optionsInstance;
+        }
+    }
+}