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21.2. Node Authorization in Library Mode

The SASL protocol in JGroups is concerned only with the authentication process. To implement node authorization, you can do so within the server callback handler by throwing an Exception.
The following example demonstrates this.

Example 21.2. Implementing Node Authorization

public class AuthorizingServerCallbackHandler implements CallbackHandler {

@Override
public void handle(Callback[] callbacks) throws IOException,
UnsupportedCallbackException {
        for (Callback callback : callbacks) {
            <!-- Additional configuration information here -->
            if (callback instanceof AuthorizeCallback) {
                AuthorizeCallback acb = (AuthorizeCallback) callback;
                if (!"myclusterrole".equals(acb.getAuthenticationID()))) {
                    throw new SecurityException("Unauthorized node " +user);
            }
            <!-- Additional configuration information here -->
        }
    }
}
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