.net - Keycloak client for ASP.NET Core

Question

Is there any existing Keycloak client for Asp.net Core? I have found a NuGet package for .net but it doesn't work with Core. Do you have any ideas how to easily integrate with this security server (or maybe using any other alternatives)?

Answer 1

I've played a bit with this today. The most straightforward way is too use OpenId standard.

In Startup.cs I used OpenIdConnect Authentication:

    public void Configure(...)
    { (...)
         app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationScheme = CookieAuthenticationDefaults.AuthenticationScheme,
            AutomaticAuthenticate = true,
            CookieHttpOnly = true,
            CookieSecure = CookieSecurePolicy.SameAsRequest
        });
        app.UseOpenIdConnectAuthentication(CreateKeycloakOpenIdConnectOptions());`(...)
 }`

OpenIdConnectOptions method:

private OpenIdConnectOptions CreateKeycloakOpenIdConnectOptions()
    {
        var options = new OpenIdConnectOptions
        {
            AuthenticationScheme = "oidc",
            SignInScheme = CookieAuthenticationDefaults.AuthenticationScheme,
            Authority = Configuration["Authentication:KeycloakAuthentication:ServerAddress"]+"/auth/realms/"+ Configuration["Authentication:KeycloakAuthentication:Realm"],
            RequireHttpsMetadata = false, //only in development
            PostLogoutRedirectUri = Configuration["Authentication:KeycloakAuthentication:PostLogoutRedirectUri"],
            ClientId = Configuration["Authentication:KeycloakAuthentication:ClientId"],
            ClientSecret = Configuration["Authentication:KeycloakAuthentication:ClientSecret"],
            ResponseType = OpenIdConnectResponseType.Code,
            GetClaimsFromUserInfoEndpoint = true,
            SaveTokens = true

        };
        options.Scope.Add("openid");
        return options;
    }

In appsettings.json add configuration for Keycloak:

{
  (...),
  "Authentication": {
    "KeycloakAuthentication": {
      "ServerAddress": "http://localhost:8180",
      "Realm": "demo",
      "PostLogoutRedirectUri": "http://localhost:57630/",
      "ClientId": "KeycloakASPNETCore",
      "ClientSecret": "secret-get-it-in-keycloakConsole-client-credentials"
    }
  }
}