Java example source code file (KRBCred.java)

This example Java source code file (KRBCred.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

asn1exception, cannot, deroutputstream, dervalue, encrypteddata, ioexception, krbaperrexception, krbcred, math, realmexception, ticket, util, vector

The KRBCred.java Java example source code

/*
 * 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.internal;

import sun.security.krb5.EncryptedData;
import sun.security.krb5.Asn1Exception;
import sun.security.krb5.RealmException;
import sun.security.util.*;
import java.util.Vector;
import java.io.IOException;
import java.math.BigInteger;

/**
 * Implements the ASN.1 Authenticator type.
 *
 * <xmp>
 * KRB-CRED     ::= [APPLICATION 22] SEQUENCE {
 *      pvno            [0] INTEGER (5),
 *      msg-type        [1] INTEGER (22),
 *      tickets         [2] SEQUENCE OF Ticket,
 *      enc-part        [3] EncryptedData -- EncKrbCredPart
 * }
 * </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 KRBCred {

    public Ticket[] tickets = null;
    public EncryptedData encPart;
    private int pvno;
    private int msgType;

    public KRBCred(Ticket[] new_tickets, EncryptedData new_encPart) throws IOException {
        pvno = Krb5.PVNO;
        msgType = Krb5.KRB_CRED;
        if (new_tickets != null) {
            tickets = new Ticket[new_tickets.length];
            for (int i = 0; i < new_tickets.length; i++) {
                if (new_tickets[i] == null) {
                    throw new IOException("Cannot create a KRBCred");
                } else {
                    tickets[i] = (Ticket) new_tickets[i].clone();
                }
            }
        }
        encPart = new_encPart;
    }

    public KRBCred(byte[] data) throws Asn1Exception,
            RealmException, KrbApErrException, IOException {
        init(new DerValue(data));
    }

    public KRBCred(DerValue encoding) throws Asn1Exception,
            RealmException, KrbApErrException, IOException {
        init(encoding);
    }

    /**
     * Initializes an KRBCred 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,
            RealmException, KrbApErrException, IOException {
        if (((encoding.getTag() & (byte) 0x1F) != (byte) 0x16)
                || (encoding.isApplication() != true)
                || (encoding.isConstructed() != true)) {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }
        DerValue der, subDer;
        der = encoding.getData().getDerValue();
        if (der.getTag() != DerValue.tag_Sequence) {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }
        subDer = der.getData().getDerValue();
        if ((subDer.getTag() & 0x1F) == 0x00) {
            pvno = subDer.getData().getBigInteger().intValue();
            if (pvno != Krb5.PVNO) {
                throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION);
            }
        } else {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }
        subDer = der.getData().getDerValue();
        if ((subDer.getTag() & 0x1F) == 0x01) {
            msgType = subDer.getData().getBigInteger().intValue();
            if (msgType != Krb5.KRB_CRED) {
                throw new KrbApErrException(Krb5.KRB_AP_ERR_MSG_TYPE);
            }
        } else {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }
        subDer = der.getData().getDerValue();
        if ((subDer.getTag() & 0x1F) == 0x02) {
            DerValue subsubDer = subDer.getData().getDerValue();
            if (subsubDer.getTag() != DerValue.tag_SequenceOf) {
                throw new Asn1Exception(Krb5.ASN1_BAD_ID);
            }
            Vector<Ticket> v = new Vector<>();
            while (subsubDer.getData().available() > 0) {
                v.addElement(new Ticket(subsubDer.getData().getDerValue()));
            }
            if (v.size() > 0) {
                tickets = new Ticket[v.size()];
                v.copyInto(tickets);
            }
        } else {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }
        encPart = EncryptedData.parse(der.getData(), (byte) 0x03, false);

        if (der.getData().available() > 0) {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }
    }

    /**
     * Encodes an KRBCred object.
     * @return the data of encoded EncAPRepPart 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 {
        DerOutputStream temp, bytes, out;
        temp = new DerOutputStream();
        temp.putInteger(BigInteger.valueOf(pvno));
        out = new DerOutputStream();
        out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
                true, (byte) 0x00), temp);
        temp = new DerOutputStream();
        temp.putInteger(BigInteger.valueOf(msgType));
        out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
                true, (byte) 0x01), temp);
        temp = new DerOutputStream();
        for (int i = 0; i < tickets.length; i++) {
            temp.write(tickets[i].asn1Encode());
        }
        bytes = new DerOutputStream();
        bytes.write(DerValue.tag_SequenceOf, temp);
        out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
                true, (byte) 0x02), bytes);
        out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
                true, (byte) 0x03), encPart.asn1Encode());
        bytes = new DerOutputStream();
        bytes.write(DerValue.tag_Sequence, out);
        out = new DerOutputStream();
        out.write(DerValue.createTag(DerValue.TAG_APPLICATION,
                true, (byte) 0x16), bytes);
        return out.toByteArray();
    }
}