Tenduke.Client.DefaultBrowser 4.0.2

Desktop / generic client library for 10Duke Identity and Entitlement

Client library for .NET applications that can access the default browser of the operating system, for using services of the 10Duke Identity and Entitlement.

Main features are:

• Authentication and authorization with OAuth 2.0 and OpenID Connect
• Querying user info
• Checking and consuming licenses
• Checking end-user permissions
• Releasing consumed licenses

Installation

The client library is available as a NuGet package. An example for installing the client library using NuGet Package Manager:

Installation with dotnet cli

dotnet add package Tenduke.Client.DefaultBrowser

Installation with NuGet PackageManager

Install-Package Tenduke.Client.DefaultBrowser

Basic usage

Class Tenduke.Client.DefaultBrowser.EntClient is the main implementation class that supports integrating a .NET application to 10Duke Identity and Entitlement service. Configuration and features of Tenduke.Client.DefaultBrowser.EntClient are introduced below.

Authentication and authorization

When using 10Duke Identity, the client application delegates authentication to the 10Duke Identity Provider. For using 10Duke APIs, including Entitlement, the client application must authorize the API calls by presenting an OAuth 2.0 access token. The simplest way to achieve both authentication (and Single Sign-On) and authorization is to use OpenID Connect (OIDC). OpenID Connect is based on OAuth 2.0, and as a result of the sign-on flow both identity and authorization are established.

Authentication and authorization are implemented using OpenID Connect Authorization Code Grant flow with PKCE. Registered default browser of the operating system is used for user interaction, most notably for the login prompt. This approach is secure, flexible and unleashes advanced use cases like federated authentication.

Using the operating system default browser

This client library calls the operating system for running the sign-on process in the OS default browser. The initial URL opened in the OS default browser starts the OpenID connect (OIDC) authentication process. The user is expected to log in to 10Duke Identity and Entitlement (if not already logged in) in this browser.

When starting the sign-on process, the client library starts an HTTP listener that waits for the OIDC response. This listener is started in the first available port in range 49215 - 65535 (IANA suggested range for dynamic or private ports). The listener will be connected only by the locally running OS default browser using the local loopback address, for example http://127.0.0.1:49215/.

When user has completed the login process, the browser redirects back to the client. This sends a request to the HTTP listener opened by the client library. The client library handles the request, completes the OIDC process and closes the HTTP listener.

When configuring the client in 10Duke, the local loopback URLs in the port range described above must be allowed as login callback URLs.

EntClient initialization

An instance of EntClient can be created like this:

var entClient = new EntClient() { OAuthConfig = myOAuthConfig };

Here, myOAuthConfig is an instance of Tenduke.Client.Config.DefaultBrowserAuthorizationCodeGrantConfig, for instance:

var myOAuthConfig = new DefaultBrowserAuthorizationCodeGrantConfig()
{
    AuthzUri = "https://my-test-idp.10duke.net/user/oauth20/authz",
    TokenUri = "https://my-test-idp.10duke.net/user/oauth20/token",
    UserInfoUri = "https://my-test-idp.10duke.net/user/info",
    ClientID = "my-client-id",
    ClientSecret = null,
    RedirectUri = null,
    Scope = "openid profile email",
    SignerKey = [Public key of 10Duke Entitlement service],
    ShowRememberMe = true,
    UsePkce = true,
    AllowInsecureCerts = false,
    ResponseTimeout = 120
};

Here, the Uris must point to an actual 10Duke Entitlement service deployment. ClientID, ClientSecret (only used if UsePkce is false) and RedirectUri are standard OAuth parameters and they must match values configured in the 10Duke Entitlement service deployment. Scope is the OAuth / OpenID Connect scope required by the client application, usually at least the openid and profile scope should be specified.

SignerKey is the RSA public key that is used for verifying signatures of tokens issued by the 10Duke Entitlement service. The following utility is provided for reading an RSA key from string, where the string can be either an RSA public key in PEM format or URL of server JWKS endpoint:

var publicKey = await Tenduke.Client.Util.CryptoUtil.ReadFirstRsaPublicKey(publicKeyOrJwksUrl, new HttpClient());

Please note that RedirectUri is ignored by this OS default browser based client library, and a dynamically created HTTP listener is used instead as described above.

Now, the EntClient instance is ready to be used for user authentication, license requests etc.

User authentication and OAuth authorization

User authentication is started with this call:

entClient.AuthorizeSync();

This starts the OAuth 2.0 / OpenID Connect flow in the OS default browser. User logs in in the browser. The client library waits for the browser to redirect back to the client, to the HTTP listener started by the client.

When login is completed, user may close the browser window, and the EntClient instance holds the login state. The following call tells if the login has been completed successfully:

var success = entClient.IsAuthorized();

Full OAuth authorization data included OpenID Connect ID Token is stored in the Authorization property:

var authorizationInfo = entClient.Authorization;

Using the client to make 10Duke API calls

Example user info and license requests are given below:

User info request

var userInfo = await entClient.UserInfoApi.GetUserInfoAsync();

This call returns an object with OpenID Connect user info.

Consume license

var tokenResponse = await entClient.AuthzApi.CheckOrConsumeAsync("MyLicense", true, ResponseType.JWT);

The call above returns a Tenduke.Client.EntApi.Authz.AuthorizationDecision object that describes an authorization decision, returned as a signed JWT token. The AuthorizationDecision indicates if a license lease has been granted (and a license seat has been taken), and the client application can rely on the AuthorizationDecision until the object expires. Expiration of the object is the same as expiration of the returned JWT token and expiration of the license lease.

var tokenResponse = await entClient.AuthzApi.CheckOrConsumeAsync(
    "MyLicense",
    true,
    ResponseType.JWT,
    ConsumptionMode.Cache,
    new List<KeyValuePair<string, string>> { new KeyValuePair<string, string>("licenseId", licenseId) });

This example specifies some more parameters to the consumption request. The last parameter shown in the example can be used for giving any additional claims understood by the license consumption endpoint. Standard additional claims include licenseId and entitlementId that can be used for explicitly selecting the license or entitlement to consume. In basic use cases for consuming if a valid license is found, these parameters are not required.

License consumption requests compute a computer id that is sent with the consumption requests in order to identify the client hardware. Computer id can be customized by setting ComputerIdentityConfig, for example the following configuration makes computer id computation use FIPS-compliant SHA256 hash algorithm:

entClient.ComputerIdentityConfig = new ComputerIdentityConfig() { HashAlg = Desktop.Util.ComputerIdentity.HashAlg.SHA256 };

Release license

var tokenResponse = await entClient.AuthzApi.ReleaseLicenseAsync(tokenResponse["jti"], ResponseType.JWT);

This call is used for returning a consumed lease (license seat) back to the license pool.

Links

• 10Duke Enterprise Documentation
• Release Notes