Keycloak.AuthServices.Authentication 2.0.0-pre-1

Keycloak.AuthServices

Easy Authentication and Authorization with Keycloak in .NET and ASP.NET Core.

Package	Version	Description
Keycloak.AuthServices.Authentication		Keycloak Authentication JWT + OICD
Keycloak.AuthServices.Authorization		Authorization Services. Use Keycloak as authorization server
Keycloak.AuthServices.Sdk		HTTP API integration with Keycloak

Getting Started

// Program.cs
var builder = WebApplication.CreateBuilder(args);

var host = builder.Host;
var configuration = builder.Configuration;
var services = builder.Services;

services.AddKeycloakAuthentication(configuration);

var app = builder.Build();

app.UseAuthentication();
app.UseAuthorization();

app.MapGet("/", () => "Hello World!");

app.Run();

In this example, configuration is based on appsettings.json.

//appsettings.json
{
    "Keycloak": {
        "realm": "Test",
        "auth-server-url": "http://localhost:8080/",
        "ssl-required": "none",
        "resource": "test-client",
        "verify-token-audience": false,
        "credentials": {
        "secret": ""
        },
        "confidential-port": 0
    }
}

It's fetched based on well-known section "Keycloak". AddKeycloakAuthentication uses KeycloakAuthenticationOptions.Section under the hood.

You can always fetch the corresponding authentication options like this:

var authenticationOptions = configuration
    .GetSection(KeycloakAuthenticationOptions.Section)
    .Get<KeycloakAuthenticationOptions>(KeycloakInstallationOptions.KeycloakFormatBinder);

services.AddKeycloakAuthentication(authenticationOptions);

AddKeycloakAuthentication method has several overloads. It allows to override some conventions, for example:

public static AuthenticationBuilder AddKeycloakAuthentication(
    this IServiceCollection services,
    IConfiguration configuration,
    string? keycloakClientSectionName,
    Action<JwtBearerOptions>? configureOptions = default)
{
    /* implementation */
}

Example. Authentication + Authorization

Here is how to add JWT-based authentication and custom authorization policy.

var builder = WebApplication.CreateBuilder(args);

var host = builder.Host;
var configuration = builder.Configuration;
var services = builder.Services;

host.ConfigureKeycloakConfigurationSource();
// conventional registration from keycloak.json
services.AddKeycloakAuthentication(configuration);

services.AddAuthorization(options =>
    {
        options.AddPolicy("RequireWorkspaces", builder =>
        {
            builder.RequireProtectedResource("workspaces", "workspaces:read") // HTTP request to Keycloak to check protected resource
                .RequireRealmRoles("User") // Realm role is fetched from token
                .RequireResourceRoles("Admin"); // Resource/Client role is fetched from token
        });
    })
    .AddKeycloakAuthorization(configuration);

var app = builder.Build();

app.UseAuthentication();
app.UseAuthorization();

app.MapGet("/workspaces", () => "[]")
    .RequireAuthorization("RequireWorkspaces");

app.Run();

Keycloak.AuthServices.Authentication

Add OpenID Connect + JWT Bearer token authentication.

For example, see Getting Started

Adapter File. Optional

Using appsettings.json is a recommended and it is an idiomatic approach for .NET, but if you want a standalone "adapter" (installation) file - keycloak.json. You can use ConfigureKeycloakConfigurationSource. It adds dedicated configuration source.

// add configuration from keycloak file
host.ConfigureKeycloakConfigurationSource("keycloak.json");
// add authentication services, OICD JwtBearerDefaults.AuthenticationScheme
services.AddKeycloakAuthentication(configuration, o =>
{
    o.RequireHttpsMetadata = false;
});

Client roles are automatically transformed into user role claims KeycloakRolesClaimsTransformation.

See Keycloak.AuthServices.Authentication - README.md

Keycloak installation file:

// confidential client
{
  "realm": "<realm>",
  "auth-server-url": "http://localhost:8088/auth/",
  "ssl-required": "external", // external | none
  "resource": "<clientId>",
  "verify-token-audience": true,
  "credentials": {
    "secret": ""
  }
}
// public client
{
  "realm": "<realm>",
  "auth-server-url": "http://localhost:8088/auth/",
  "ssl-required": "external",
  "resource": "<clientId>",
  "public-client": true,
  "confidential-port": 0
}

Keycloak.AuthServices.Authorization

services.AddAuthorization(authOptions =>
{
    authOptions.AddPolicy("<policyName>", policyBuilder =>
    {
        // configure policies here
    });
}).AddKeycloakAuthorization(configuration);

See Keycloak.AuthServices.Authorization - README.md

Keycloak.AuthServices.Sdk

Keycloak API clients.

// requires confidential client
services.AddKeycloakAdminHttpClient(keycloakOptions);

// based on token forwarding HttpClient middleware and IHttpContextAccessor
services.AddKeycloakProtectionHttpClient(keycloakOptions);

See Keycloak.AuthServices.Sdk - README.md

Build and Development

dotnet cake --target build

dotnet pack -o ./Artefacts

Blog Posts

For more information and real world examples, please see my blog posts related to Keycloak and .NET https://nikiforovall.github.io/tags.html#keycloak-ref

Reference

• https://github.com/keycloak/keycloak-documentation/blob/main/authorization_services/topics/service-authorization-uma-authz-process.adoc
• https://www.keycloak.org/docs/latest/authorization_services/index.html