Java example source code file (KrbTgsReq.java)
The KrbTgsReq.java Java example source code
/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
*
* (C) Copyright IBM Corp. 1999 All Rights Reserved.
* Copyright 1997 The Open Group Research Institute. All rights reserved.
*/
package sun.security.krb5;
import sun.security.krb5.internal.*;
import sun.security.krb5.internal.crypto.*;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Arrays;
/**
* This class encapsulates a Kerberos TGS-REQ that is sent from the
* client to the KDC.
*/
public class KrbTgsReq {
private PrincipalName princName;
private PrincipalName servName;
private TGSReq tgsReqMessg;
private KerberosTime ctime;
private Ticket secondTicket = null;
private boolean useSubkey = false;
EncryptionKey tgsReqKey;
private static final boolean DEBUG = Krb5.DEBUG;
private byte[] obuf;
private byte[] ibuf;
// Used in CredentialsUtil
public KrbTgsReq(Credentials asCreds,
PrincipalName sname)
throws KrbException, IOException {
this(new KDCOptions(),
asCreds,
sname,
null, // KerberosTime from
null, // KerberosTime till
null, // KerberosTime rtime
null, // eTypes, // null, // int[] eTypes
null, // HostAddresses addresses
null, // AuthorizationData authorizationData
null, // Ticket[] additionalTickets
null); // EncryptionKey subSessionKey
}
// S4U2proxy
public KrbTgsReq(Credentials asCreds,
Ticket second,
PrincipalName sname)
throws KrbException, IOException {
this(KDCOptions.with(KDCOptions.CNAME_IN_ADDL_TKT,
KDCOptions.FORWARDABLE),
asCreds,
sname,
null,
null,
null,
null,
null,
null,
new Ticket[] {second}, // the service ticket
null);
}
// S4U2user
public KrbTgsReq(Credentials asCreds,
PrincipalName sname,
PAData extraPA)
throws KrbException, IOException {
this(KDCOptions.with(KDCOptions.FORWARDABLE),
asCreds,
asCreds.getClient(),
sname,
null,
null,
null,
null,
null,
null,
null,
null,
extraPA); // the PA-FOR-USER
}
// Called by Credentials, KrbCred
KrbTgsReq(
KDCOptions options,
Credentials asCreds,
PrincipalName sname,
KerberosTime from,
KerberosTime till,
KerberosTime rtime,
int[] eTypes,
HostAddresses addresses,
AuthorizationData authorizationData,
Ticket[] additionalTickets,
EncryptionKey subKey) throws KrbException, IOException {
this(options, asCreds, asCreds.getClient(), sname,
from, till, rtime, eTypes, addresses,
authorizationData, additionalTickets, subKey, null);
}
private KrbTgsReq(
KDCOptions options,
Credentials asCreds,
PrincipalName cname,
PrincipalName sname,
KerberosTime from,
KerberosTime till,
KerberosTime rtime,
int[] eTypes,
HostAddresses addresses,
AuthorizationData authorizationData,
Ticket[] additionalTickets,
EncryptionKey subKey,
PAData extraPA) throws KrbException, IOException {
princName = cname;
servName = sname;
ctime = KerberosTime.now();
// check if they are valid arguments. The optional fields
// should be consistent with settings in KDCOptions.
// TODO: Is this necessary? If the TGT is not FORWARDABLE,
// you can still request for a FORWARDABLE ticket, just the
// KDC will give you a non-FORWARDABLE one. Even if you
// cannot use the ticket expected, it still contains info.
// This means there will be problem later. We already have
// flags check in KrbTgsRep. Of course, sometimes the KDC
// will not issue the ticket at all.
if (options.get(KDCOptions.FORWARDABLE) &&
(!(asCreds.flags.get(Krb5.TKT_OPTS_FORWARDABLE)))) {
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
}
if (options.get(KDCOptions.FORWARDED)) {
if (!(asCreds.flags.get(KDCOptions.FORWARDABLE)))
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
}
if (options.get(KDCOptions.PROXIABLE) &&
(!(asCreds.flags.get(Krb5.TKT_OPTS_PROXIABLE)))) {
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
}
if (options.get(KDCOptions.PROXY)) {
if (!(asCreds.flags.get(KDCOptions.PROXIABLE)))
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
}
if (options.get(KDCOptions.ALLOW_POSTDATE) &&
(!(asCreds.flags.get(Krb5.TKT_OPTS_MAY_POSTDATE)))) {
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
}
if (options.get(KDCOptions.RENEWABLE) &&
(!(asCreds.flags.get(Krb5.TKT_OPTS_RENEWABLE)))) {
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
}
if (options.get(KDCOptions.POSTDATED)) {
if (!(asCreds.flags.get(KDCOptions.POSTDATED)))
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
} else {
if (from != null) from = null;
}
if (options.get(KDCOptions.RENEWABLE)) {
if (!(asCreds.flags.get(KDCOptions.RENEWABLE)))
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
} else {
if (rtime != null) rtime = null;
}
if (options.get(KDCOptions.ENC_TKT_IN_SKEY) || options.get(KDCOptions.CNAME_IN_ADDL_TKT)) {
if (additionalTickets == null)
throw new KrbException(Krb5.KRB_AP_ERR_REQ_OPTIONS);
// in TGS_REQ there could be more than one additional
// tickets, but in file-based credential cache,
// there is only one additional ticket field.
secondTicket = additionalTickets[0];
} else {
if (additionalTickets != null)
additionalTickets = null;
}
tgsReqMessg = createRequest(
options,
asCreds.ticket,
asCreds.key,
ctime,
princName,
servName,
from,
till,
rtime,
eTypes,
addresses,
authorizationData,
additionalTickets,
subKey,
extraPA);
obuf = tgsReqMessg.asn1Encode();
// XXX We need to revisit this to see if can't move it
// up such that FORWARDED flag set in the options
// is included in the marshaled request.
/*
* If this is based on a forwarded ticket, record that in the
* options, because the returned TgsRep will contain the
* FORWARDED flag set.
*/
if (asCreds.flags.get(KDCOptions.FORWARDED))
options.set(KDCOptions.FORWARDED, true);
}
/**
* Sends a TGS request to the realm of the target.
* @throws KrbException
* @throws IOException
*/
public void send() throws IOException, KrbException {
String realmStr = null;
if (servName != null)
realmStr = servName.getRealmString();
KdcComm comm = new KdcComm(realmStr);
ibuf = comm.send(obuf);
}
public KrbTgsRep getReply()
throws KrbException, IOException {
return new KrbTgsRep(ibuf, this);
}
/**
* Sends the request, waits for a reply, and returns the Credentials.
* Used in Credentials, KrbCred, and internal/CredentialsUtil.
*/
public Credentials sendAndGetCreds() throws IOException, KrbException {
KrbTgsRep tgs_rep = null;
String kdc = null;
send();
tgs_rep = getReply();
return tgs_rep.getCreds();
}
KerberosTime getCtime() {
return ctime;
}
private TGSReq createRequest(
KDCOptions kdc_options,
Ticket ticket,
EncryptionKey key,
KerberosTime ctime,
PrincipalName cname,
PrincipalName sname,
KerberosTime from,
KerberosTime till,
KerberosTime rtime,
int[] eTypes,
HostAddresses addresses,
AuthorizationData authorizationData,
Ticket[] additionalTickets,
EncryptionKey subKey,
PAData extraPA)
throws IOException, KrbException, UnknownHostException {
KerberosTime req_till = null;
if (till == null) {
req_till = new KerberosTime(0);
} else {
req_till = till;
}
/*
* RFC 4120, Section 5.4.2.
* For KRB_TGS_REP, the ciphertext is encrypted in the
* sub-session key from the Authenticator, or if absent,
* the session key from the ticket-granting ticket used
* in the request.
*
* To support this, use tgsReqKey to remember which key to use.
*/
tgsReqKey = key;
int[] req_eTypes = null;
if (eTypes == null) {
req_eTypes = EType.getDefaults("default_tgs_enctypes");
} else {
req_eTypes = eTypes;
}
EncryptionKey reqKey = null;
EncryptedData encAuthorizationData = null;
if (authorizationData != null) {
byte[] ad = authorizationData.asn1Encode();
if (subKey != null) {
reqKey = subKey;
tgsReqKey = subKey; // Key to use to decrypt reply
useSubkey = true;
encAuthorizationData = new EncryptedData(reqKey, ad,
KeyUsage.KU_TGS_REQ_AUTH_DATA_SUBKEY);
} else
encAuthorizationData = new EncryptedData(key, ad,
KeyUsage.KU_TGS_REQ_AUTH_DATA_SESSKEY);
}
KDCReqBody reqBody = new KDCReqBody(
kdc_options,
cname,
sname,
from,
req_till,
rtime,
Nonce.value(),
req_eTypes,
addresses,
encAuthorizationData,
additionalTickets);
byte[] temp = reqBody.asn1Encode(Krb5.KRB_TGS_REQ);
// if the checksum type is one of the keyed checksum types,
// use session key.
Checksum cksum;
switch (Checksum.CKSUMTYPE_DEFAULT) {
case Checksum.CKSUMTYPE_RSA_MD4_DES:
case Checksum.CKSUMTYPE_DES_MAC:
case Checksum.CKSUMTYPE_DES_MAC_K:
case Checksum.CKSUMTYPE_RSA_MD4_DES_K:
case Checksum.CKSUMTYPE_RSA_MD5_DES:
case Checksum.CKSUMTYPE_HMAC_SHA1_DES3_KD:
case Checksum.CKSUMTYPE_HMAC_MD5_ARCFOUR:
case Checksum.CKSUMTYPE_HMAC_SHA1_96_AES128:
case Checksum.CKSUMTYPE_HMAC_SHA1_96_AES256:
cksum = new Checksum(Checksum.CKSUMTYPE_DEFAULT, temp, key,
KeyUsage.KU_PA_TGS_REQ_CKSUM);
break;
case Checksum.CKSUMTYPE_CRC32:
case Checksum.CKSUMTYPE_RSA_MD4:
case Checksum.CKSUMTYPE_RSA_MD5:
default:
cksum = new Checksum(Checksum.CKSUMTYPE_DEFAULT, temp);
}
// Usage will be KeyUsage.KU_PA_TGS_REQ_AUTHENTICATOR
byte[] tgs_ap_req = new KrbApReq(
new APOptions(),
ticket,
key,
cname,
cksum,
ctime,
reqKey,
null,
null).getMessage();
PAData tgsPAData = new PAData(Krb5.PA_TGS_REQ, tgs_ap_req);
return new TGSReq(
extraPA != null ?
new PAData[] {extraPA, tgsPAData } :
new PAData[] {tgsPAData},
reqBody);
}
TGSReq getMessage() {
return tgsReqMessg;
}
Ticket getSecondTicket() {
return secondTicket;
}
private static void debug(String message) {
// System.err.println(">>> KrbTgsReq: " + message);
}
boolean usedSubkey() {
return useSubkey;
}
}
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