| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package backtype.storm.security.auth.kerberos; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.security.Principal; |
| import java.util.Map; |
| import javax.security.auth.Subject; |
| import javax.security.auth.callback.CallbackHandler; |
| import javax.security.auth.kerberos.KerberosTicket; |
| import javax.security.auth.login.LoginException; |
| import javax.security.auth.spi.LoginModule; |
| |
| /** |
| * Custom LoginModule to enable Auto Login based on cached ticket |
| */ |
| public class AutoTGTKrb5LoginModule implements LoginModule { |
| private static final Logger LOG = LoggerFactory.getLogger(AutoTGTKrb5LoginModule.class); |
| |
| // initial state |
| private Subject subject; |
| |
| protected KerberosTicket kerbTicket = null; |
| |
| public void initialize(Subject subject, CallbackHandler callbackHandler, Map<String, ?> sharedState, Map<String, ?> options) { |
| |
| this.subject = subject; |
| } |
| |
| public boolean login() throws LoginException { |
| LOG.debug("Acquire TGT from Cache"); |
| getKerbTicketFromCache(); |
| if (kerbTicket != null) { |
| return true; |
| } else { |
| throw new LoginException("Authentication failed, the TGT not found."); |
| } |
| } |
| |
| protected void getKerbTicketFromCache() { |
| kerbTicket = AutoTGT.kerbTicket.get(); |
| } |
| |
| protected Principal getKerbTicketClient() { |
| if (kerbTicket != null) { |
| return kerbTicket.getClient(); |
| } |
| return null; |
| } |
| |
| public boolean commit() throws LoginException { |
| if (isSucceeded() == false) { |
| return false; |
| } |
| if (subject == null || subject.isReadOnly()) { |
| kerbTicket = null; |
| throw new LoginException("Authentication failed because the Subject is invalid."); |
| } |
| // Let us add the kerbClientPrinc and kerbTicket |
| subject.getPrivateCredentials().add(kerbTicket); |
| subject.getPrincipals().add(getKerbTicketClient()); |
| LOG.debug("Commit Succeeded."); |
| return true; |
| } |
| |
| public boolean abort() throws LoginException { |
| if (isSucceeded() == false) { |
| return false; |
| } else { |
| return logout(); |
| } |
| } |
| |
| public boolean logout() throws LoginException { |
| if (subject != null && !subject.isReadOnly() && kerbTicket != null) { |
| subject.getPrincipals().remove(kerbTicket.getClient()); |
| subject.getPrivateCredentials().remove(kerbTicket); |
| } |
| kerbTicket = null; |
| return true; |
| } |
| |
| private boolean isSucceeded() { |
| return kerbTicket != null; |
| } |
| } |