/*
* 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
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*/
/*
* (C) Copyright IBM Corp. 1999 All Rights Reserved.
* Copyright 1997 The Open Group Research Institute. All rights reserved.
*/
package sun.security.krb5.internal;
import sun.security.krb5.*;
import sun.security.util.*;
import java.util.Vector;
import java.io.IOException;
import java.math.BigInteger;
/**
* Implements the ASN.1 Authenticator type.
*
* <xmp>
* Authenticator ::= [APPLICATION 2] SEQUENCE {
* authenticator-vno [0] INTEGER (5),
* crealm [1] Realm,
* cname [2] PrincipalName,
* cksum [3] Checksum OPTIONAL,
* cusec [4] Microseconds,
* ctime [5] KerberosTime,
* subkey [6] EncryptionKey OPTIONAL,
* seq-number [7] UInt32 OPTIONAL,
* authorization-data [8] AuthorizationData OPTIONAL
* }
* </xmp>
*
* <p>
* This definition reflects the Network Working Group RFC 4120
* specification available at
* <a href="http://www.ietf.org/rfc/rfc4120.txt">
* http://www.ietf.org/rfc/rfc4120.txt</a>.
*/
public class Authenticator {
public int authenticator_vno;
public Realm crealm;
public PrincipalName cname;
Checksum cksum; //optional
public int cusec;
public KerberosTime ctime;
EncryptionKey subKey; //optional
Integer seqNumber; //optional
public AuthorizationData authorizationData; //optional
public Authenticator (
Realm new_crealm,
PrincipalName new_cname,
Checksum new_cksum,
int new_cusec,
KerberosTime new_ctime,
EncryptionKey new_subKey,
Integer new_seqNumber,
AuthorizationData new_authorizationData
) {
authenticator_vno = Krb5.AUTHNETICATOR_VNO;
crealm = new_crealm;
cname = new_cname;
cksum = new_cksum;
cusec = new_cusec;
ctime = new_ctime;
subKey = new_subKey;
seqNumber = new_seqNumber;
authorizationData = new_authorizationData;
}
public Authenticator(byte[] data)
throws Asn1Exception, IOException, KrbApErrException, RealmException {
init(new DerValue(data));
}
public Authenticator(DerValue encoding)
throws Asn1Exception,IOException, KrbApErrException, RealmException {
init(encoding);
}
/**
* Initializes an Authenticator object.
* @param encoding a single DER-encoded value.
* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
* @exception IOException if an I/O error occurs while reading encoded data.
* @exception KrbApErrException if the value read from the DER-encoded data
* stream does not match the pre-defined value.
* @exception RealmException if an error occurs while parsing a Realm object.
*/
private void init(DerValue encoding)
throws Asn1Exception, IOException, KrbApErrException, RealmException {
DerValue der, subDer;
//may not be the correct error code for a tag
//mismatch on an encrypted structure
if (((encoding.getTag() & (byte)0x1F) != (byte)0x02)
|| (encoding.isApplication() != true)
|| (encoding.isConstructed() != true))
throw new Asn1Exception(Krb5.ASN1_BAD_ID);
der = encoding.getData().getDerValue();
if (der.getTag() != DerValue.tag_Sequence)
throw new Asn1Exception(Krb5.ASN1_BAD_ID);
subDer = der.getData().getDerValue();
if ((subDer.getTag() & (byte)0x1F) != (byte)0x00)
throw new Asn1Exception(Krb5.ASN1_BAD_ID);
authenticator_vno = subDer.getData().getBigInteger().intValue();
if (authenticator_vno != 5)
throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION);
crealm = Realm.parse(der.getData(), (byte)0x01, false);
cname = PrincipalName.parse(der.getData(), (byte)0x02, false);
cksum = Checksum.parse(der.getData(), (byte)0x03, true);
subDer = der.getData().getDerValue();
if ((subDer.getTag() & (byte)0x1F) == 0x04) {
cusec = subDer.getData().getBigInteger().intValue();
}
else throw new Asn1Exception(Krb5.ASN1_BAD_ID);
ctime = KerberosTime.parse(der.getData(), (byte)0x05, false);
if (der.getData().available() > 0) {
subKey = EncryptionKey.parse(der.getData(), (byte)0x06, true);
}
else {
subKey = null;
seqNumber = null;
authorizationData = null;
}
if (der.getData().available() > 0) {
if ((der.getData().peekByte() & 0x1F) == 0x07) {
subDer = der.getData().getDerValue();
if ((subDer.getTag() & (byte)0x1F) == (byte)0x07)
seqNumber = new Integer(subDer.getData().getBigInteger().intValue());
}
}
else {
seqNumber = null;
authorizationData = null;
}
if (der.getData().available() > 0) {
authorizationData = AuthorizationData.parse(der.getData(), (byte)0x08, true);
}
else authorizationData = null;
if (der.getData().available() > 0)
throw new Asn1Exception(Krb5.ASN1_BAD_ID);
}
/**
* Encodes an Authenticator object.
* @return byte array of encoded Authenticator object.
* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
* @exception IOException if an I/O error occurs while reading encoded data.
*/
public byte[] asn1Encode() throws Asn1Exception, IOException {
Vector<DerValue> v = new Vector<DerValue> ();
DerOutputStream temp = new DerOutputStream();
temp.putInteger(BigInteger.valueOf(authenticator_vno));
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp.toByteArray()));
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), crealm.asn1Encode()));
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x02), cname.asn1Encode()));
if (cksum != null)
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x03), cksum.asn1Encode()));
temp = new DerOutputStream();
temp.putInteger(BigInteger.valueOf(cusec));
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x04), temp.toByteArray()));
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x05), ctime.asn1Encode()));
if (subKey != null)
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x06), subKey.asn1Encode()));
if (seqNumber != null) {
temp = new DerOutputStream();
// encode as an unsigned integer (UInt32)
temp.putInteger(BigInteger.valueOf(seqNumber.longValue()));
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x07), temp.toByteArray()));
}
if (authorizationData != null)
v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x08), authorizationData.asn1Encode()));
DerValue der[] = new DerValue[v.size()];
v.copyInto(der);
temp = new DerOutputStream();
temp.putSequence(der);
DerOutputStream out = new DerOutputStream();
out.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte)0x02), temp);
return out.toByteArray();
}
public final Checksum getChecksum() {
return cksum;
}
public final Integer getSeqNumber() {
return seqNumber;
}
public final EncryptionKey getSubKey() {
return subKey;
}
}