Samhammer.Authentication.Abstractions 6.1.2

Samhammer.Authentication.Api

This provides a way to secure your api with keycloak jwt bearer authentication.

How to add this to your project:

• reference this nuget package: https://www.nuget.org/packages/Samhammer.Authentication.Api/

How to use:

Keycloak JWT Authentication

Add it to your api.

public void ConfigureServices(IServiceCollection services)
{
    services.AddJwtAuthentication()
        .AddKeycloak(Configuration);
}

public void Configure(IApplicationBuilder app)
{
    app.UseAuthentication();
    app.UseAuthorization();
}

Api calls requires auhorization header with an JWT token from keycloak.

POST https://myapi/action HTTP/1.1
Auhorization: Bearer JwtTokenContent

If you pass "IConfiguration" instead of "Action<ApiAuthOptions>" to "AddKeycloak" add the following to appsettings.json:

"ApiAuthOptions": {
    "Issuer": "<<KeycloakTokenIssuerUrl>>",
    "ClientId": "<<ClientIdRepresentingYourApp>>",
    "NameClaim": "<<NameOfClaimWhichShouldBeSetToNameClaim>>"
}

NameClaim is optional and default value is "preferred_username"

Guest Authentication

Add it to your api.

public void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication(GuestAuthenticationDefaults.AuthenticationScheme)
        .AddGuest(Configuration);
}

Api calls requires header guestid with an "Version 4 UUID".

POST https://myapi/action HTTP/1.1
guestid: 1c11792b-538f-4908-992d-6570bb268e60

If you pass "IConfiguration" instead of "Action<GuestAuthOptions>" to "AddGuest" you can can override the default settings in appsettings.json:

"GuestAuthOptions": {
    "Enabled": true,
    "Name": "guest-[GuestID]",    
    "Role": "SomeGuestRole",
    "Validator": "[0-9a-fA-F]{8}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{12}"
}

Mixed Authentication

You can also setup both authentication types. In the example below jwt keycloak will be the default.

public void ConfigureServices(IServiceCollection services)
{
    services.AddJwtAuthentication()
        .AddKeycloak(Configuration)
        .AddGuest(Configuration);
}

You can setup your supported authentication types on each controller action per attribute.

[HttpPost]
[Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme + ", " + GuestAuthenticationDefaults.AuthenticationScheme)]
public async Task<IActionResult> ActionForBoth()
{}

[HttpPost]
[Authorize(GuestAuthenticationDefaults.AuthenticationScheme)]
public async Task<IActionResult> ActionForGuests()
{}

Samhammer.Authentication.Client

The library provides extension methods for authentication client. This library is using Duende.AccessTokenManagement under the hood.

See https://github.com/DuendeSoftware/Duende.AccessTokenManagement/wiki/Customizing-Client-Credentials-Token-Management

Currently, we have the ClientCredentialsConfigureExtensions class which provides an extension method for ClientCredentialsClient to add a client with options monitor support. Ensure to call extension method AddClientCredentialsTokenManagement of Duende before!

How to use in Program.cs

builder.Services.AddDistributedMemoryCache();
builder.Services.AddClientCredentialsTokenManagement();

builder.Services.AddClientCredentialsOptions<ApiAuthOptions>("defaultAuth", (client, authOptions) =>
{
    client.TokenEndpoint = authOptions.AccessTokenUrl;
    client.ClientId = authOptions.ClientId;
    client.ClientSecret = authOptions.ClientSecret;
});

builder.Services
    .AddHttpClient<TInterface, TService>())
    .AddClientCredentialsTokenHandler("defaultAuth");

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