java-u2flib-server

Server-side U2F library for Java. Provides functionality for registering U2F devices and authenticate with said devices.

Dependency

 <dependency>
   <groupId>com.yubico</groupId>
   <artifactId>u2flib-server-core</artifactId>
   <version>0.15.0</version>
 </dependency>

Example Usage

Note	Make sure that you have read Using a U2F library before continuing.

@GET
public View startAuthentication(String username) throws NoEligableDevicesException {

    // Generate a challenge for each U2F device that this user has registered
    AuthenticateRequestData requestData
        = u2f.startAuthentication(SERVER_ADDRESS, getRegistrations(username));

    // Store the challenges for future reference
    requestStorage.put(requestData.getRequestId(), requestData.toJson());

    // Return an HTML page containing the challenges
    return new AuthenticationView(requestData.toJson(), username);
}

@POST
public String finishAuthentication(AuthenticateResponse response, String username) throws
        DeviceCompromisedException {

    // Get the challenges that we stored when starting the authentication
    AuthenticateRequestData authenticateRequest
        = requestStorage.remove(authenticateResponse.getRequestId());

    // Verify the that the given response is valid for one of the registered devices
    u2f.finishAuthentication(authenticateRequest,
                             authenticateResponse,
                             getRegistrations(username));

    return "Successfully authenticated!";
}

In the above example getRegistrations() returns the U2F devices currently associated with a given user. This is most likely stored in a database. See u2flib-server-demo for a complete demo server (including registration and storage of U2F devices).

JavaDoc

JavaDoc can be found at developers.yubico.com/java-u2flib-server.

Attestation

The attestation module (u2flib-server-attestation) enables you to restrict registrations to certain U2F devices (e.g. devices made by a specific vendor). It can also provide metadata for devices.

Serialization

All relevant classes implements Serializable, so instead of using toJson(), you can use Java’s built in serialization mechanism. Internally the classes use Jackson to serialize to and from JSON, and the ObjectMapper from Jackson can be used.