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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.wss4j.common.spnego;
import java.security.Principal;
import java.util.Set;
import javax.security.auth.Subject;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.ietf.jgss.GSSContext;
import org.ietf.jgss.GSSException;
import org.ietf.jgss.MessageProp;
/**
* This class wraps a GSSContext and provides some functionality to obtain and validate spnego tokens.
*/
public class SpnegoTokenContext {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(SpnegoTokenContext.class);
private GSSContext secContext;
private byte[] token;
private boolean mutualAuth;
private SpnegoClientAction clientAction = new DefaultSpnegoClientAction();
private SpnegoServiceAction serviceAction = new DefaultSpnegoServiceAction();
/**
* Retrieve a service ticket from a KDC using the Kerberos JAAS module, and set it in this
* BinarySecurityToken.
* @param jaasLoginModuleName the JAAS Login Module name to use
* @param callbackHandler a CallbackHandler instance to retrieve a password (optional)
* @param serviceName the desired Kerberized service
* @throws WSSecurityException
*/
public void retrieveServiceTicket(
String jaasLoginModuleName,
CallbackHandler callbackHandler,
String serviceName
) throws WSSecurityException {
// Get a TGT from the KDC using JAAS
LoginContext loginContext = null;
try {
if (callbackHandler == null) {
loginContext = new LoginContext(jaasLoginModuleName);
} else {
loginContext = new LoginContext(jaasLoginModuleName, callbackHandler);
}
loginContext.login();
} catch (LoginException ex) {
if (LOG.isDebugEnabled()) {
LOG.debug(ex.getMessage(), ex);
}
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE,
"kerberosLoginError",
ex,
ex.getMessage());
}
if (LOG.isDebugEnabled()) {
LOG.debug("Successfully authenticated to the TGT");
}
Subject clientSubject = loginContext.getSubject();
Set clientPrincipals = clientSubject.getPrincipals();
if (clientPrincipals.isEmpty()) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE,
"kerberosLoginError",
"No Client principals found after login");
}
// Get the service ticket
clientAction.setServiceName(serviceName);
clientAction.setMutualAuth(mutualAuth);
token = Subject.doAs(clientSubject, clientAction);
if (token == null) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "kerberosServiceTicketError"
);
}
secContext = clientAction.getContext();
if (LOG.isDebugEnabled()) {
LOG.debug("Successfully retrieved a service ticket");
}
}
/**
* Validate a service ticket.
* @param jaasLoginModuleName
* @param callbackHandler
* @param serviceName
* @param ticket
* @throws WSSecurityException
*/
public void validateServiceTicket(
String jaasLoginModuleName,
CallbackHandler callbackHandler,
String serviceName,
byte[] ticket
) throws WSSecurityException {
// Get a TGT from the KDC using JAAS
LoginContext loginContext = null;
try {
if (callbackHandler == null) {
loginContext = new LoginContext(jaasLoginModuleName);
} else {
loginContext = new LoginContext(jaasLoginModuleName, callbackHandler);
}
loginContext.login();
} catch (LoginException ex) {
if (LOG.isDebugEnabled()) {
LOG.debug(ex.getMessage(), ex);
}
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE,
"kerberosLoginError",
ex,
ex.getMessage());
}
if (LOG.isDebugEnabled()) {
LOG.debug("Successfully authenticated to the TGT");
}
// Get the service name to use - fall back on the principal
Subject subject = loginContext.getSubject();
String service = serviceName;
if (service == null) {
Set principals = subject.getPrincipals();
if (principals.isEmpty()) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE,
"kerberosLoginError",
"No Client principals found after login");
}
service = principals.iterator().next().getName();
}
// Validate the ticket
serviceAction.setTicket(ticket);
serviceAction.setServiceName(service);
token = Subject.doAs(subject, serviceAction);
secContext = serviceAction.getContext();
if (LOG.isDebugEnabled()) {
LOG.debug("Successfully validated a service ticket");
}
}
/**
* Whether to enable mutual authentication or not. This only applies to retrieve service ticket.
*/
public void setMutualAuth(boolean mutualAuthentication) {
mutualAuth = mutualAuthentication;
}
/**
* Get the SPNEGO token that was created.
*/
public byte[] getToken() {
return token;
}
/**
* Whether a connection has been established (at the service side)
*/
public boolean isEstablished() {
if (secContext == null) {
return false;
}
return secContext.isEstablished();
}
/**
* Unwrap a key
*/
public byte[] unwrapKey(byte[] secret) throws WSSecurityException {
MessageProp mProp = new MessageProp(0, true);
try {
return secContext.unwrap(secret, 0, secret.length, mProp);
} catch (GSSException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Error in cleaning up a GSS context", e);
}
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "spnegoKeyError", e
);
}
}
/**
* Wrap a key
*/
public byte[] wrapKey(byte[] secret) throws WSSecurityException {
MessageProp mProp = new MessageProp(0, true);
try {
return secContext.wrap(secret, 0, secret.length, mProp);
} catch (GSSException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Error in cleaning up a GSS context", e);
}
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "spnegoKeyError", e
);
}
}
/**
* Set a custom SpnegoClientAction implementation to use
*/
public void setSpnegoClientAction(SpnegoClientAction spnegoClientAction) {
this.clientAction = spnegoClientAction;
}
/**
* Set a custom SpnegoServiceAction implementation to use
*/
public void setSpnegoServiceAction(SpnegoServiceAction spnegoServiceAction) {
this.serviceAction = spnegoServiceAction;
}
public void clear() {
token = null;
mutualAuth = false;
try {
secContext.dispose();
} catch (GSSException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Error in cleaning up a GSS context", e);
}
}
}
}
