/*
* Copyright (C) 2006-2008 Alfresco Software Limited.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* As a special exception to the terms and conditions of version 2.0 of
* the GPL, you may redistribute this Program in connection with Free/Libre
* and Open Source Software ("FLOSS") applications as described in Alfresco's
* FLOSS exception. You should have recieved a copy of the text describing
* the FLOSS exception, and it is also available here:
* http://www.alfresco.com/legal/licensing"
*/
package org.alfresco.jlan.server.auth.kerberos;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Iterator;
import org.alfresco.jlan.server.auth.asn.DERBuffer;
import org.alfresco.jlan.server.auth.asn.DERGeneralString;
import org.alfresco.jlan.server.auth.asn.DERInteger;
import org.alfresco.jlan.server.auth.asn.DERObject;
import org.alfresco.jlan.server.auth.asn.DEROctetString;
import org.alfresco.jlan.server.auth.asn.DERSequence;
/**
* Kerberos ticket Class
*
* @author gkspencer
*/
public class KrbTicket {
// Realm and principal name
private String m_realm;
private PrincipalName m_principalName;
// Encrypted part
private int m_encType;
private byte[] m_encPart;
private int m_encKvno = -1;
/**
* Default constructor
*/
public KrbTicket()
{
}
/**
* Class constructor
*
* @param byte[] blob
* @exception IOException
*/
public KrbTicket(byte[] blob)
throws IOException
{
parseTicket( blob);
}
/**
* Return the realm
*/
public final String getRealm()
{
return m_realm;
}
/**
* Return the principal name
*
* @return PrincipalName
*/
public final PrincipalName getPrincipalName()
{
return m_principalName;
}
/**
* Return the encrypted part of the ticket
*
* @return byte[]
*/
public final byte[] getEncryptedPart()
{
return m_encPart;
}
/**
* Return the encrypted part type
*
* @return int
*/
public final int getEncryptedType()
{
return m_encType;
}
/**
* Return the encrypted part key version number
*
* @return int
*/
public final int getEncryptedPartKeyVersion()
{
return m_encKvno;
}
/**
* Parse a Kerberos ticket blob
*
* @param byte[] blob
* @exception IOException
*/
public final void parseTicket( byte[] blob)
throws IOException
{
// Create a stream to parse the ASN.1 encoded Kerberos ticket blob
DERBuffer derBuf = new DERBuffer( blob);
DERObject derObj = derBuf.unpackObject();
if ( derObj instanceof DERSequence)
{
// Enumerate the Kerberos ticket objects
DERSequence derSeq = (DERSequence) derObj;
Iterator<DERObject> iterObj = derSeq.getObjects();
while ( iterObj.hasNext())
{
// Read an object
derObj = iterObj.next();
if ( derObj != null && derObj.isTagged())
{
switch ( derObj.getTagNo())
{
// Tkt-vno
case 0:
if ( derObj instanceof DERInteger)
{
DERInteger derInt = (DERInteger) derObj;
if ( derInt.intValue() != 5)
throw new IOException("Unexpected VNO value in Kerberos ticket");
}
break;
// Realm
case 1:
if ( derObj instanceof DERGeneralString)
{
DERGeneralString derStr = (DERGeneralString) derObj;
m_realm = derStr.getValue();
}
break;
// Principal name
case 2:
if ( derObj instanceof DERSequence)
{
DERSequence derPrincSeq = (DERSequence) derObj;
m_principalName = new PrincipalName();
m_principalName.parsePrincipalName( derPrincSeq);
}
break;
// Encrypted part of the ticket
case 3:
if ( derObj instanceof DERSequence)
{
DERSequence derEncSeq = (DERSequence) derObj;
// Enumerate the sequence
Iterator<DERObject> iterEncSeq = derEncSeq.getObjects();
while ( iterEncSeq.hasNext())
{
// Get the current sequence element
derObj = iterEncSeq.next();
if ( derObj != null && derObj.isTagged())
{
switch ( derObj.getTagNo())
{
// Encryption type
case 0:
if ( derObj instanceof DERInteger)
{
DERInteger derInt = (DERInteger) derObj;
m_encType = derInt.intValue();
}
break;
// Kvno
case 1:
if ( derObj instanceof DERInteger)
{
DERInteger derInt = (DERInteger) derObj;
m_encKvno = derInt.intValue();
}
break;
// Cipher
case 2:
if ( derObj instanceof DEROctetString)
{
DEROctetString derOct = (DEROctetString) derObj;
m_encPart = derOct.getValue();
}
break;
}
}
}
}
break;
}
}
}
}
}
/**
* Return the Kerberos ticket as a string
*
* @return String
*/
public String toString()
{
StringBuilder str = new StringBuilder();
str.append("[KrbTkt Realm=");
str.append(getRealm());
str.append(",Principal=");
str.append(getPrincipalName());
str.append(",EncPart=Type=");
str.append(getEncryptedType());
str.append(",KVNO=");
str.append(getEncryptedPartKeyVersion());
str.append(",Len=");
str.append(getEncryptedPart() != null ? getEncryptedPart().length : 0);
str.append("]");
return str.toString();
}
}