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The Apache WSS4J project provides a Java implementation of the primary security standards for Web Services, namely the OASIS Web Services Security (WS-Security) specifications from the OASIS Web Services Security TC.
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/**
 * 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 org.apache.ws.security.message.token;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.Key;
import java.security.PrivilegedExceptionAction;

import javax.security.auth.kerberos.KerberosPrincipal;

import org.apache.ws.security.WSSecurityException;
import org.ietf.jgss.GSSContext;
import org.ietf.jgss.GSSCredential;
import org.ietf.jgss.GSSException;
import org.ietf.jgss.GSSManager;
import org.ietf.jgss.GSSName;
import org.ietf.jgss.Oid;


public class KerberosServiceExceptionAction implements PrivilegedExceptionAction {

    private static final String javaVersion = System.getProperty("java.version");
    private static final boolean isJava5Or6 = javaVersion.startsWith("1.5") || javaVersion.startsWith("1.6");
    private static final boolean isOracleJavaVendor = System.getProperty("java.vendor").startsWith("Oracle");
    private static final boolean isIBMJavaVendor = System.getProperty("java.vendor").startsWith("IBM");

    private static final String SUN_JGSS_INQUIRE_TYPE_CLASS = "com.sun.security.jgss.InquireType";
    private static final String SUN_JGSS_EXT_GSSCTX_CLASS = "com.sun.security.jgss.ExtendedGSSContext";

    private static final String IBM_JGSS_INQUIRE_TYPE_CLASS = "com.ibm.security.jgss.InquireType";
    private static final String IBM_JGSS_EXT_GSSCTX_CLASS = "com.ibm.security.jgss.ExtendedGSSContext";

    private static final String EXTENDED_JGSS_CONTEXT_INQUIRE_SEC_CONTEXT_METHOD_NAME = "inquireSecContext";
    private static final String EXTENDED_JGSS_CONTEXT_INQUIRE_TYPE_KRB5_GET_SESSION_KEY = "KRB5_GET_SESSION_KEY";

    private static final String JGSS_KERBEROS_TICKET_OID = "1.2.840.113554.1.2.2";

    private static final String KERBEROS_TICKET_VALIDATION_ERROR_MSG_ID = "kerberosTicketValidationError";

    private byte[] ticket;
    private String serviceName;
    private boolean isUsernameServiceNameForm;

    public KerberosServiceExceptionAction(byte[] ticket, String serviceName, boolean isUsernameServiceNameForm) {
        this.ticket = ticket;
        this.serviceName = serviceName;
        this.isUsernameServiceNameForm = isUsernameServiceNameForm;
    }


    /* (non-Javadoc)
     * @see java.security.PrivilegedExceptionAction#run()
     */
    public KerberosServiceContext run() throws GSSException, WSSecurityException {

        GSSManager gssManager = GSSManager.getInstance();

        Oid kerberos5Oid = new Oid(JGSS_KERBEROS_TICKET_OID);
        GSSName gssService = gssManager.createName(serviceName, isUsernameServiceNameForm ? GSSName.NT_USER_NAME : GSSName.NT_HOSTBASED_SERVICE);
        GSSCredential credentials = 
            gssManager.createCredential(
                gssService, GSSCredential.DEFAULT_LIFETIME, kerberos5Oid, GSSCredential.ACCEPT_ONLY
            );

        KerberosServiceContext krbServiceCtx = null;
        GSSContext secContext = null;

        try{
            secContext = gssManager.createContext(credentials);
            secContext.acceptSecContext(ticket, 0, ticket.length);

            krbServiceCtx = new KerberosServiceContext();            

            GSSName clientName = secContext.getSrcName();
            krbServiceCtx.setPrincipal(new KerberosPrincipal(clientName.toString()));

            if (!isJava5Or6 && (isOracleJavaVendor || isIBMJavaVendor)) {
                try {
                    @SuppressWarnings("rawtypes")
                    Class inquireType = Class.forName(isOracleJavaVendor ? SUN_JGSS_INQUIRE_TYPE_CLASS : IBM_JGSS_INQUIRE_TYPE_CLASS);

                    @SuppressWarnings("rawtypes")
                    Class extendedGSSContext = Class.forName(isOracleJavaVendor ? SUN_JGSS_EXT_GSSCTX_CLASS : IBM_JGSS_EXT_GSSCTX_CLASS);

                    @SuppressWarnings("unchecked")
                    Method inquireSecContext = extendedGSSContext.getMethod(EXTENDED_JGSS_CONTEXT_INQUIRE_SEC_CONTEXT_METHOD_NAME, inquireType);

                    @SuppressWarnings("unchecked")
                    Key key = (Key) inquireSecContext.invoke(secContext, Enum.valueOf(inquireType, EXTENDED_JGSS_CONTEXT_INQUIRE_TYPE_KRB5_GET_SESSION_KEY));

                    krbServiceCtx.setSessionKey(key);
                }
                catch (ClassNotFoundException e) {
                    throw new WSSecurityException(
                        WSSecurityException.FAILURE, KERBEROS_TICKET_VALIDATION_ERROR_MSG_ID, new Object[] {}, e
                    );
                }
                catch (NoSuchMethodException e) {
                    throw new WSSecurityException(
                        WSSecurityException.FAILURE, KERBEROS_TICKET_VALIDATION_ERROR_MSG_ID, new Object[] {}, e
                    );
                }
                catch (InvocationTargetException e) {
                    throw new WSSecurityException(
                        WSSecurityException.FAILURE, KERBEROS_TICKET_VALIDATION_ERROR_MSG_ID, new Object[] {}, e.getCause()
                    );
                }
                catch (IllegalAccessException e) {
                    throw new WSSecurityException(
                        WSSecurityException.FAILURE, KERBEROS_TICKET_VALIDATION_ERROR_MSG_ID, new Object[] {}, e
                    );
                }            
            }            
        } finally {
            if (null != secContext) {
                secContext.dispose();    
            }  
        }               

        return krbServiceCtx;
    }

}