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Chapter 26. Security for Cluster Traffic

26.1. Configure Node Security in Library Mode
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In Library mode, node authentication is configured directly in the JGroups configuration. JGroups can be configured so that nodes must authenticate each other when joining or merging with a cluster. The authentication uses SASL and is enabled by adding the SASL protocol to your JGroups XML configuration.

SASL relies on JAAS notions, such as CallbackHandlers, to obtain certain information necessary for the authentication handshake. Users must supply their own CallbackHandlers on both client and server sides.

Important

The JAAS API is only available when configuring user authentication and authorization, and is not available for node security.

The following example demonstrates how to implement a CallbackHandler class. In this example, login and password are checked against values provided via Java properties when JBoss Data Grid is started, and authorization is checked against role which is defined in the class ("test_user").

Callback Handler Class

public class SaslPropAuthUserCallbackHandler implements CallbackHandler {

   private static final String APPROVED_USER = "test_user";

   private final String name;
   private final char[] password;
   private final String realm;

   public SaslPropAuthUserCallbackHandler() {
      this.name = System.getProperty("sasl.username");
      this.password = System.getProperty("sasl.password").toCharArray();
      this.realm = System.getProperty("sasl.realm");
   }

   @Override
   public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
      for (Callback callback : callbacks) {
         if (callback instanceof PasswordCallback) {
            ((PasswordCallback) callback).setPassword(password);
         } else if (callback instanceof NameCallback) {
            ((NameCallback) callback).setName(name);
         } else if (callback instanceof AuthorizeCallback) {
            AuthorizeCallback authorizeCallback = (AuthorizeCallback) callback;
            if (APPROVED_USER.equals(authorizeCallback.getAuthorizationID())) {
               authorizeCallback.setAuthorized(true);
            } else {
               authorizeCallback.setAuthorized(false);
            }
         } else if (callback instanceof RealmCallback) {
            RealmCallback realmCallback = (RealmCallback) callback;
            realmCallback.setText(realm);
         } else {
            throw new UnsupportedCallbackException(callback);
         }
      }
   }

}
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For authentication, specify the javax.security.auth.callback.NameCallback and javax.security.auth.callback.PasswordCallback callbacks

For authorization, specify the callbacks required for authentication, as well as specifying the javax.security.sasl.AuthorizeCallback callback.

26.2. Node Authorization in Library Mode
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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.

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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