/*
* Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.security.jgss.krb5;
import javax.security.auth.kerberos.KerberosTicket;
import javax.security.auth.kerberos.KerberosKey;
import javax.security.auth.kerberos.KerberosPrincipal;
import javax.security.auth.Subject;
import javax.security.auth.login.LoginException;
import java.security.AccessControlContext;
import sun.security.jgss.GSSUtil;
import sun.security.krb5.Credentials;
import sun.security.krb5.EncryptionKey;
import sun.security.krb5.KrbException;
import java.io.IOException;
import java.util.List;
/**
* Utilities for obtaining and converting Kerberos tickets.
*
* @version 1.16, 05/05/07
*/
public class Krb5Util {
static final boolean DEBUG =
((Boolean)java.security.AccessController.doPrivileged(
new sun.security.action.GetBooleanAction
("sun.security.krb5.debug"))).booleanValue();
/**
* Default constructor
*/
private Krb5Util() { // Cannot create one of these
}
/**
* Retrieve the service ticket for serverPrincipal from caller's Subject
* or from Subject obtained by logging in, or if not found, via the
* Ticket Granting Service using the TGT obtained from the Subject.
*
* Caller must have permission to:
* - access and update Subject's private credentials
* - create LoginContext
* - read the auth.login.defaultCallbackHandler security property
*
* NOTE: This method is used by JSSE Kerberos Cipher Suites
*/
public static KerberosTicket getTicketFromSubjectAndTgs(int caller,
String clientPrincipal, String serverPrincipal, String tgsPrincipal,
AccessControlContext acc)
throws LoginException, KrbException, IOException {
// 1. Try to find service ticket in acc subject
Subject accSubj = Subject.getSubject(acc);
KerberosTicket ticket = (KerberosTicket) SubjectComber.find(accSubj,
serverPrincipal, clientPrincipal, KerberosTicket.class);
if (ticket != null) {
return ticket; // found it
}
Subject loginSubj = null;
if (!GSSUtil.useSubjectCredsOnly()) {
// 2. Try to get ticket from login
try {
loginSubj = GSSUtil.login(caller, GSSUtil.GSS_KRB5_MECH_OID);
ticket = (KerberosTicket) SubjectComber.find(loginSubj,
serverPrincipal, clientPrincipal, KerberosTicket.class);
if (ticket != null) {
return ticket; // found it
}
} catch (LoginException e) {
// No login entry to use
// ignore and continue
}
}
// Service ticket not found in subject or login
// Try to get TGT to acquire service ticket
// 3. Try to get TGT from acc subject
KerberosTicket tgt = (KerberosTicket) SubjectComber.find(accSubj,
tgsPrincipal, clientPrincipal, KerberosTicket.class);
boolean fromAcc;
if (tgt == null && loginSubj != null) {
// 4. Try to get TGT from login subject
tgt = (KerberosTicket) SubjectComber.find(loginSubj,
tgsPrincipal, clientPrincipal, KerberosTicket.class);
fromAcc = false;
} else {
fromAcc = true;
}
// 5. Try to get service ticket using TGT
if (tgt != null) {
Credentials tgtCreds = ticketToCreds(tgt);
Credentials serviceCreds = Credentials.acquireServiceCreds(
serverPrincipal, tgtCreds);
if (serviceCreds != null) {
ticket = credsToTicket(serviceCreds);
// Store service ticket in acc's Subject
if (fromAcc && accSubj != null && !accSubj.isReadOnly()) {
accSubj.getPrivateCredentials().add(ticket);
}
}
}
return ticket;
}
/**
* Retrieves the ticket corresponding to the client/server principal
* pair from the Subject in the specified AccessControlContext.
* If the ticket can not be found in the Subject, and if
* useSubjectCredsOnly is false, then obtain ticket from
* a LoginContext.
*/
static KerberosTicket getTicket(int caller,
String clientPrincipal, String serverPrincipal,
AccessControlContext acc) throws LoginException {
// Try to get ticket from acc's Subject
Subject accSubj = Subject.getSubject(acc);
KerberosTicket ticket = (KerberosTicket)
SubjectComber.find(accSubj, serverPrincipal, clientPrincipal,
KerberosTicket.class);
// Try to get ticket from Subject obtained from GSSUtil
if (ticket == null && !GSSUtil.useSubjectCredsOnly()) {
Subject subject = GSSUtil.login(caller, GSSUtil.GSS_KRB5_MECH_OID);
ticket = (KerberosTicket) SubjectComber.find(subject,
serverPrincipal, clientPrincipal, KerberosTicket.class);
}
return ticket;
}
/**
* Retrieves the caller's Subject, or Subject obtained by logging in
* via the specified caller.
*
* Caller must have permission to:
* - access the Subject
* - create LoginContext
* - read the auth.login.defaultCallbackHandler security property
*
* NOTE: This method is used by JSSE Kerberos Cipher Suites
*/
public static Subject getSubject(int caller,
AccessControlContext acc) throws LoginException {
// Try to get the Subject from acc
Subject subject = Subject.getSubject(acc);
// Try to get Subject obtained from GSSUtil
if (subject == null && !GSSUtil.useSubjectCredsOnly()) {
subject = GSSUtil.login(caller, GSSUtil.GSS_KRB5_MECH_OID);
}
return subject;
}
/**
* Retrieves the keys for the specified server principal from
* the Subject in the specified AccessControlContext.
* If the ticket can not be found in the Subject, and if
* useSubjectCredsOnly is false, then obtain keys from
* a LoginContext.
*
* NOTE: This method is used by JSSE Kerberos Cipher Suites
*/
public static KerberosKey[] getKeys(int caller,
String serverPrincipal, AccessControlContext acc)
throws LoginException {
Subject accSubj = Subject.getSubject(acc);
List<KerberosKey> kkeys = (List<KerberosKey>)SubjectComber.findMany(
accSubj, serverPrincipal, null, KerberosKey.class);
if (kkeys == null && !GSSUtil.useSubjectCredsOnly()) {
Subject subject = GSSUtil.login(caller, GSSUtil.GSS_KRB5_MECH_OID);
kkeys = (List<KerberosKey>) SubjectComber.findMany(subject,
serverPrincipal, null, KerberosKey.class);
}
int len;
if (kkeys != null && (len = kkeys.size()) > 0) {
KerberosKey[] keys = new KerberosKey[len];
kkeys.toArray(keys);
return keys;
} else {
return null;
}
}
public static KerberosTicket credsToTicket(Credentials serviceCreds) {
EncryptionKey sessionKey = serviceCreds.getSessionKey();
return new KerberosTicket(
serviceCreds.getEncoded(),
new KerberosPrincipal(serviceCreds.getClient().getName()),
new KerberosPrincipal(serviceCreds.getServer().getName(),
KerberosPrincipal.KRB_NT_SRV_INST),
sessionKey.getBytes(),
sessionKey.getEType(),
serviceCreds.getFlags(),
serviceCreds.getAuthTime(),
serviceCreds.getStartTime(),
serviceCreds.getEndTime(),
serviceCreds.getRenewTill(),
serviceCreds.getClientAddresses());
};
public static Credentials ticketToCreds(KerberosTicket kerbTicket)
throws KrbException, IOException {
return new Credentials(
kerbTicket.getEncoded(),
kerbTicket.getClient().getName(),
kerbTicket.getServer().getName(),
kerbTicket.getSessionKey().getEncoded(),
kerbTicket.getSessionKeyType(),
kerbTicket.getFlags(),
kerbTicket.getAuthTime(),
kerbTicket.getStartTime(),
kerbTicket.getEndTime(),
kerbTicket.getRenewTill(),
kerbTicket.getClientAddresses());
}
}
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