/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed 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 org.keycloak.federation.kerberos.impl;
import org.jboss.logging.Logger;
import org.keycloak.common.util.KerberosJdkProvider;
import org.keycloak.federation.kerberos.CommonKerberosConfig;
import javax.security.auth.Subject;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.auth.login.Configuration;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import java.io.IOException;
/**
* @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
*/
public class KerberosServerSubjectAuthenticator {
private static final Logger logger = Logger.getLogger(KerberosServerSubjectAuthenticator.class);
private static final CallbackHandler NO_CALLBACK_HANDLER = new CallbackHandler() {
@Override
public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
throw new UnsupportedCallbackException(callbacks[0]);
}
};
private final CommonKerberosConfig config;
private LoginContext loginContext;
public KerberosServerSubjectAuthenticator(CommonKerberosConfig config) {
this.config = config;
}
public Subject authenticateServerSubject() throws LoginException {
Configuration config = createJaasConfiguration();
loginContext = new LoginContext("does-not-matter", null, NO_CALLBACK_HANDLER, config);
loginContext.login();
return loginContext.getSubject();
}
public void logoutServerSubject() {
if (loginContext != null) {
try {
loginContext.logout();
} catch (LoginException le) {
logger.error("Failed to logout kerberos server subject: " + config.getServerPrincipal(), le);
}
}
}
protected Configuration createJaasConfiguration() {
return KerberosJdkProvider.getProvider().createJaasConfigurationForServer(config.getKeyTab(), config.getServerPrincipal(), config.isDebug());
}
}