Web Api .net framework 4.6.1 and identityServer4

Question

Web Api .net framework

I have an authentication service done with IdentityServer4 .net core 1.1. The client settings are as follows:

new Client
{
    ClientId = "client",
    AllowedGrantTypes = GrantTypes.ClientCredentials,

    ClientSecrets = 
    {
        new Secret("secret".Sha256())
    },
    AllowedScopes = { "api1" }
},

// resource owner password grant client
new Client
{
    ClientId = "ro.client",
    AllowedGrantTypes = GrantTypes.ResourceOwnerPassword,

    ClientSecrets = 
    {
        new Secret("secret".Sha256())
    },
    AllowedScopes = { "api1" }
},

// OpenID Connect hybrid flow and client credentials client (MVC)
new Client
{
    ClientId = "mvc",
    ClientName = "MVC Client",
    AllowedGrantTypes = GrantTypes.HybridAndClientCredentials,

    RequireConsent = true,

    ClientSecrets = 
    {
        new Secret("secret".Sha256())
    },

    RedirectUris = { "http://localhost:5002/signin-oidc" },
    PostLogoutRedirectUris = { "http://localhost:5002/signout-callback-oidc" },

    AllowedScopes =
    {
        IdentityServerConstants.StandardScopes.OpenId,
        IdentityServerConstants.StandardScopes.Profile,
        "api1"
    },
    AllowOfflineAccess = true
},

// JavaScript Client
new Client
{
    ClientId = "js",
    ClientName = "JavaScript Client",
    AllowedGrantTypes = GrantTypes.Implicit,
    AllowAccessTokensViaBrowser = true,

    RedirectUris = { "http://localhost/web/main.html#/redirectLogin#" },
    PostLogoutRedirectUris = { "http://localhost/web" },
    AllowedCorsOrigins = { "http://localhost" },

    AllowedScopes =
    {
        IdentityServerConstants.StandardScopes.OpenId,
        IdentityServerConstants.StandardScopes.Profile,
        "api1"
    },

    RequireConsent = false
}

I have a front-end application with javascript using oidc-client. In it I can authenticate to the authentication server with the following settings:

var userManagerConfig = {
    authority: "http://localhost:5000",
    client_id: "js",
    redirect_uri: "http://localhost/web/main.html#/redirectLogin#",
    response_type: "id_token token",
    scope: "openid profile api1",
    post_logout_redirect_uri: "http://localhost/web",
};

var userManager = new Oidc.UserManager(userManagerConfig);

I also have an api web made in .net framework 4.6.1. In it I want to receive authentication from the front end and use the authentication server to validate the access.

How should the settings be made for this case?

m3n7alsnak3 m3n7alsnak3 · Accepted Answer · 2018-03-01T16:55:34

Your API should be registered as an API Resource in Identity Server. Then - it should implement the OwinStartup and have this in it:

 public void Configuration(IAppBuilder app)
    {
        // accept access tokens from identityserver and require a scope of 'api1'
        app.UseIdentityServerBearerTokenAuthentication(new IdentityServerBearerTokenAuthenticationOptions
        {
            Authority = "<ids address>",
            ValidationMode = ValidationMode.Both,

            RequiredScopes = new[] { "myapi" }
        });

        // configure web api
        var config = new HttpConfiguration();
        config.MapHttpAttributeRoutes();

        app.UseWebApi(config);
    }

And, because it is a .NET Framework API, it needs to reference IdentityServer3.AccessTokenValidation. This should not bother you and cause any concerns. It deals with IdentityServer4 tokens with no hesitation.

Everything else is standard - you need AuthorizeAttribute on all controllers/methods that you want to require or add this:

        // require authentication for all controllers
        config.Filters.Add(new AuthorizeAttribute());

In the Startup.cs and force authorization on all controllers.

Web Api .net framework 4.6.1 and identityServer4

2 Answers