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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.dom.message.token;
import java.io.IOException;
import java.security.Key;
import java.security.Principal;
import java.security.PrivilegedActionException;
import java.util.Set;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
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.kerberos.KerberosTicket;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import org.apache.wss4j.common.bsp.BSPEnforcer;
import org.apache.wss4j.common.bsp.BSPRule;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.apache.wss4j.common.ext.WSSecurityException.ErrorCode;
import org.apache.wss4j.common.kerberos.KerberosClientExceptionAction;
import org.apache.wss4j.common.kerberos.KerberosContext;
import org.apache.wss4j.common.kerberos.KerberosContextAndServiceNameCallback;
import org.apache.wss4j.common.token.BinarySecurity;
import org.apache.wss4j.dom.WSConstants;
import org.ietf.jgss.GSSCredential;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Kerberos Security Token.
*/
public class KerberosSecurity extends BinarySecurity {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(KerberosSecurity.class);
private SecretKey secretKey;
/**
* This constructor creates a new Kerberos token object and initializes
* it from the data contained in the element.
*
* @param elem the element containing the Kerberos token data
* @param bspEnforcer a BSPEnforcer instance to enforce BSP rules
* @throws WSSecurityException
*/
public KerberosSecurity(Element elem, BSPEnforcer bspEnforcer) throws WSSecurityException {
super(elem, bspEnforcer);
String valueType = getValueType();
if (!WSConstants.WSS_GSS_KRB_V5_AP_REQ.equals(valueType)) {
bspEnforcer.handleBSPRule(BSPRule.R6902);
}
}
/**
* This constructor creates a new Kerberos element.
*
* @param doc
*/
public KerberosSecurity(Document doc) {
super(doc);
}
/**
* Return true if this token is a Kerberos V5 AP REQ token
*/
public boolean isV5ApReq() {
String type = getValueType();
if (WSConstants.WSS_KRB_V5_AP_REQ.equals(type)
|| WSConstants.WSS_KRB_V5_AP_REQ1510.equals(type)
|| WSConstants.WSS_KRB_V5_AP_REQ4120.equals(type)) {
return true;
}
return false;
}
/**
* Return true if this token is a Kerberos GSS V5 AP REQ token
*/
public boolean isGssV5ApReq() {
String type = getValueType();
if (WSConstants.WSS_GSS_KRB_V5_AP_REQ.equals(type)
|| WSConstants.WSS_GSS_KRB_V5_AP_REQ1510.equals(type)
|| WSConstants.WSS_GSS_KRB_V5_AP_REQ4120.equals(type)) {
return true;
}
return false;
}
/**
* Retrieve a service ticket from a KDC using the Kerberos JAAS module, and set it in this
* BinarySecurityToken.
* @param callbackHandler a CallbackHandler instance to retrieve a password (optional),
* JAAS Login Module name (required) + service name (required)
* @throws WSSecurityException
*/
public void retrieveServiceTicket(
CallbackHandler callbackHandler
) throws WSSecurityException {
KerberosContextAndServiceNameCallback contextAndServiceNameCallback =
new KerberosContextAndServiceNameCallback();
try {
callbackHandler.handle(new Callback[]{contextAndServiceNameCallback});
} catch (IOException | UnsupportedCallbackException e) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, e);
}
String jaasLoginModuleName = contextAndServiceNameCallback.getContextName();
if (jaasLoginModuleName == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE,
"kerberosCallbackContextNameNotSupplied");
}
String serviceName = contextAndServiceNameCallback.getServiceName();
if (serviceName == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE,
"kerberosCallbackServiceNameNotSupplied");
}
retrieveServiceTicket(jaasLoginModuleName, callbackHandler, serviceName);
}
/**
* 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 {
retrieveServiceTicket(jaasLoginModuleName, callbackHandler, serviceName, false);
}
public void retrieveServiceTicket(
String jaasLoginModuleName,
CallbackHandler callbackHandler,
String serviceName,
boolean isUsernameServiceNameForm
) throws WSSecurityException {
retrieveServiceTicket(jaasLoginModuleName, callbackHandler, serviceName,
isUsernameServiceNameForm, false);
}
public void retrieveServiceTicket(
String jaasLoginModuleName,
CallbackHandler callbackHandler,
String serviceName,
boolean isUsernameServiceNameForm,
boolean requestCredDeleg
) throws WSSecurityException {
retrieveServiceTicket(jaasLoginModuleName, callbackHandler, serviceName,
isUsernameServiceNameForm, requestCredDeleg, null);
}
public void retrieveServiceTicket(
String jaasLoginModuleName,
CallbackHandler callbackHandler,
String serviceName,
boolean isUsernameServiceNameForm,
boolean requestCredDeleg,
GSSCredential delegatedCredential
) 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) {
LOG.debug(ex.getMessage(), ex);
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, ex,
"kerberosLoginError",
new Object[] {ex.getMessage()}
);
}
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",
new Object[] {"No Client principals found after login"});
}
// Store the TGT
KerberosTicket tgt = getKerberosTicket(clientSubject, null);
decorateSubject(clientSubject);
// Get the service ticket
KerberosClientExceptionAction action =
new KerberosClientExceptionAction(clientPrincipals.iterator().next(), serviceName,
isUsernameServiceNameForm, requestCredDeleg,
delegatedCredential, false, false);
KerberosContext krbCtx = null;
try {
krbCtx = (KerberosContext) Subject.doAs(clientSubject, action);
// Get the secret key from KerberosContext if available, otherwise use Kerberos ticket's session key
Key sessionKey = krbCtx.getSecretKey();
if (sessionKey != null) {
secretKey = new SecretKeySpec(sessionKey.getEncoded(), sessionKey.getAlgorithm());
} else {
KerberosTicket serviceTicket = getKerberosTicket(clientSubject, tgt);
if (serviceTicket != null) {
secretKey = serviceTicket.getSessionKey();
}
}
if (secretKey == null) {
LOG.debug("No secret key for kerberos was found");
} else {
LOG.debug("Successfully retrieved a secret key for kerberos");
}
setToken(krbCtx.getKerberosToken());
} catch (PrivilegedActionException e) {
Throwable cause = e.getCause();
if (cause instanceof WSSecurityException) {
throw (WSSecurityException) cause;
} else {
throw new WSSecurityException(
ErrorCode.FAILURE, new Exception(cause), "kerberosServiceTicketError"
);
}
} finally {
if (krbCtx != null) {
krbCtx.dispose();
}
}
LOG.debug("Successfully retrieved a service ticket");
if ("".equals(getValueType())) {
setValueType(WSConstants.WSS_GSS_KRB_V5_AP_REQ);
}
}
// Allow subclasses to decorate the Subject if required.
protected void decorateSubject(Subject subject) {
}
/**
* Get a KerberosTicket from the clientSubject parameter, that is not equal to the supplied KerberosTicket
* parameter (can be null)
*/
private KerberosTicket getKerberosTicket(Subject clientSubject, KerberosTicket previousTicket) {
Set privateCredentials = clientSubject.getPrivateCredentials(KerberosTicket.class);
if (privateCredentials == null || privateCredentials.isEmpty()) {
LOG.debug("Kerberos client subject private credentials are null");
return null;
}
for (KerberosTicket privateCredential : privateCredentials) {
if (!privateCredential.equals(previousTicket)) {
return privateCredential;
}
}
return null;
}
/**
* Get the SecretKey associated with the service principal
* @return the SecretKey associated with the service principal
*/
public SecretKey getSecretKey() {
return secretKey;
}
/**
* Return true if the valueType represents a Kerberos Token
* @param valueType the valueType of the token
* @return true if the valueType represents a Kerberos Token
*/
public static boolean isKerberosToken(String valueType) {
if (WSConstants.WSS_KRB_V5_AP_REQ.equals(valueType)
|| WSConstants.WSS_GSS_KRB_V5_AP_REQ.equals(valueType)
|| WSConstants.WSS_KRB_V5_AP_REQ1510.equals(valueType)
|| WSConstants.WSS_GSS_KRB_V5_AP_REQ1510.equals(valueType)
|| WSConstants.WSS_KRB_V5_AP_REQ4120.equals(valueType)
|| WSConstants.WSS_GSS_KRB_V5_AP_REQ4120.equals(valueType)) {
return true;
}
return false;
}
@Override
public boolean equals(Object object) {
if (!(object instanceof KerberosSecurity)) {
return false;
}
KerberosSecurity that = (KerberosSecurity)object;
if (secretKey != null && !secretKey.equals(that.secretKey)) {
return false;
} else if (secretKey == null && that.secretKey != null) {
return false;
}
return super.equals(object);
}
@Override
public int hashCode() {
int hashCode = 17;
if (secretKey != null) {
hashCode *= 31 + secretKey.hashCode();
}
hashCode *= 31 + super.hashCode();
return hashCode;
}
}
