Java example source code file (KDCOptions.java)

This example Java source code file (KDCOptions.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

allow_postdate, asn1exception, bits_per_unit, debug, kdc_opt_forwardable, kdc_opt_proxiable, kdc_opt_renewable_ok, kdcoptions, postdated, string, unused10, unused11, unused7, validate

The KDCOptions.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.Config;
import sun.security.krb5.KrbException;
import sun.security.krb5.Asn1Exception;
import sun.security.krb5.internal.util.KerberosFlags;
import sun.security.util.*;
import java.io.IOException;

/**
 * Implements the ASN.1 KDCOptions type.
 *
 * <xmp>
 * KDCOptions   ::= KerberosFlags
 *      -- reserved(0),
 *      -- forwardable(1),
 *      -- forwarded(2),
 *      -- proxiable(3),
 *      -- proxy(4),
 *      -- allow-postdate(5),
 *      -- postdated(6),
 *      -- unused7(7),
 *      -- renewable(8),
 *      -- unused9(9),
 *      -- unused10(10),
 *      -- opt-hardware-auth(11),
 *      -- unused12(12),
 *      -- unused13(13),
 * -- 15 is reserved for canonicalize
 *      -- unused15(15),
 * -- 26 was unused in 1510
 *      -- disable-transited-check(26),
 *      -- renewable-ok(27),
 *      -- enc-tkt-in-skey(28),
 *      -- renew(30),
 *      -- validate(31)
 *
 * KerberosFlags   ::= BIT STRING (SIZE (32..MAX))
 *                      -- minimum number of bits shall be sent,
 *                      -- but no fewer than 32
 *
 * </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>.
 *
 * <p>
 * This class appears as data field in the initial request(KRB_AS_REQ)
 * or subsequent request(KRB_TGS_REQ) to the KDC and indicates the flags
 * that the client wants to set on the tickets.
 *
 * The optional bits are:
 * <UL>
 *  <LI>KDCOptions.RESERVED
 *  <LI>KDCOptions.FORWARDABLE
 *  <LI>KDCOptions.FORWARDED
 *  <LI>KDCOptions.PROXIABLE
 *  <LI>KDCOptions.PROXY
 *  <LI>KDCOptions.ALLOW_POSTDATE
 *  <LI>KDCOptions.POSTDATED
 *  <LI>KDCOptions.RENEWABLE
 *  <LI>KDCOptions.RENEWABLE_OK
 *  <LI>KDCOptions.ENC_TKT_IN_SKEY
 *  <LI>KDCOptions.RENEW
 *  <LI>KDCOptions.VALIDATE
 *  </UL>
 * <p> Various checks must be made before honoring an option. The restrictions
 * on the use of some options are as follows:
 * <ol>
 * <li> FORWARDABLE, FORWARDED, PROXIABLE, RENEWABLE options may be set in
 * subsequent request only if the ticket_granting ticket on which it is based has
 * the same options (FORWARDABLE, FORWARDED, PROXIABLE, RENEWABLE) set.
 * <li> ALLOW_POSTDATE may be set in subsequent request only if the
 * ticket-granting ticket on which it is based also has its MAY_POSTDATE flag set.
 * <li> POSTDATED may be set in subsequent request only if the
 * ticket-granting ticket on which it is based also has its MAY_POSTDATE flag set.
 * <li> RENEWABLE or RENEW may be set in subsequent request only if the
 * ticket-granting ticket on which it is based also has its RENEWABLE flag set.
 * <li> POXY may be set in subsequent request only if the ticket-granting ticket
 * on which it is based also has its PROXIABLE flag set, and the address(es) of
 * the host from which the resulting ticket is to be valid should be included
 * in the addresses field of the request.
 * <li>FORWARDED, PROXY, ENC_TKT_IN_SKEY, RENEW, VALIDATE are used only in
 * subsequent requests.
 * </ol>

 */

public class KDCOptions extends KerberosFlags {

    private static final int KDC_OPT_PROXIABLE = 0x10000000;
    private static final int KDC_OPT_RENEWABLE_OK = 0x00000010;
    private static final int KDC_OPT_FORWARDABLE = 0x40000000;


    // KDC Options

    public static final int RESERVED        = 0;
    public static final int FORWARDABLE     = 1;
    public static final int FORWARDED       = 2;
    public static final int PROXIABLE       = 3;
    public static final int PROXY           = 4;
    public static final int ALLOW_POSTDATE  = 5;
    public static final int POSTDATED       = 6;
    public static final int UNUSED7         = 7;
    public static final int RENEWABLE       = 8;
    public static final int UNUSED9         = 9;
    public static final int UNUSED10        = 10;
    public static final int UNUSED11        = 11;
    public static final int CNAME_IN_ADDL_TKT = 14;
    public static final int RENEWABLE_OK    = 27;
    public static final int ENC_TKT_IN_SKEY = 28;
    public static final int RENEW           = 30;
    public static final int VALIDATE        = 31;

    private static final String[] names = {
        "RESERVED",         //0
        "FORWARDABLE",      //1;
        "FORWARDED",        //2;
        "PROXIABLE",        //3;
        "PROXY",            //4;
        "ALLOW_POSTDATE",   //5;
        "POSTDATED",        //6;
        "UNUSED7",          //7;
        "RENEWABLE",        //8;
        "UNUSED9",          //9;
        "UNUSED10",         //10;
        "UNUSED11",         //11;
        null,null,
        "CNAME_IN_ADDL_TKT",//14;
        null,null,null,null,null,null,null,null,null,null,null,null,
        "RENEWABLE_OK",     //27;
        "ENC_TKT_IN_SKEY",  //28;
        null,
        "RENEW",            //30;
        "VALIDATE",         //31;
    };

    private boolean DEBUG = Krb5.DEBUG;

    public static KDCOptions with(int... flags) {
        KDCOptions options = new KDCOptions();
        for (int flag: flags) {
            options.set(flag, true);
        }
        return options;
    }

    public KDCOptions() {
        super(Krb5.KDC_OPTS_MAX + 1);
        setDefault();
    }

    public KDCOptions(int size, byte[] data) throws Asn1Exception {
        super(size, data);
        if ((size > data.length * BITS_PER_UNIT) || (size > Krb5.KDC_OPTS_MAX + 1))
            throw new Asn1Exception(Krb5.BITSTRING_BAD_LENGTH);
    }

    /**
     * Constructs a KDCOptions from the specified bit settings.
     *
     * @param data the bits to be set for the KDCOptions.
     * @exception Asn1Exception if an error occurs while decoding an ASN1
     * encoded data.
     *
     */
    public KDCOptions(boolean[] data) throws Asn1Exception {
        super(data);
        if (data.length > Krb5.KDC_OPTS_MAX + 1) {
            throw new Asn1Exception(Krb5.BITSTRING_BAD_LENGTH);
        }
    }

    public KDCOptions(DerValue encoding) throws Asn1Exception, IOException {
        this(encoding.getUnalignedBitString(true).toBooleanArray());
    }

    /**
     * Constructs a KDCOptions from the passed bit settings.
     *
     * @param options the bits to be set for the KDCOptions.
     *
     */
    public KDCOptions(byte[] options) {
        super(options.length * BITS_PER_UNIT, options);
    }

    /**
     * Parse (unmarshal) a KDCOptions from a DER input stream.  This form
     * parsing might be used when expanding a value which is part of
     * a constructed sequence and uses explicitly tagged type.
     *
     * @param data the Der input stream value, which contains one or more
     * marshaled value.
     * @param explicitTag tag number.
     * @param optional indicate if this data field is optional
     * @return an instance of KDCOptions.
     * @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 static KDCOptions parse(DerInputStream data, byte explicitTag, boolean optional) throws Asn1Exception, IOException {
        if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != explicitTag))
            return null;
        DerValue der = data.getDerValue();
        if (explicitTag != (der.getTag() & (byte)0x1F))  {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        } else {
            DerValue subDer = der.getData().getDerValue();
            return new KDCOptions(subDer);
        }
    }

    /**
     * Sets the value(true/false) for one of the <code>KDCOptions.
     *
     * @param option an option bit.
     * @param value true if the option is selected, false if the option is not selected.
     * @exception ArrayIndexOutOfBoundsException if array index out of bound occurs.
     * @see sun.security.krb5.internal.Krb5
     */
    public void set(int option, boolean value) throws ArrayIndexOutOfBoundsException {
        super.set(option, value);
    }

    /**
     * Gets the value(true/false) for one of the <code>KDCOptions.
     *
     * @param option an option bit.
     * @return value true if the option is selected, false if the option is not selected.
     * @exception ArrayIndexOutOfBoundsException if array index out of bound occurs.
     * @see sun.security.krb5.internal.Krb5
     */

    public boolean get(int option) throws ArrayIndexOutOfBoundsException {
        return super.get(option);
    }

    @Override public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("KDCOptions: ");
        for (int i=0; i<Krb5.KDC_OPTS_MAX+1; i++) {
            if (get(i)) {
                if (names[i] != null) {
                    sb.append(names[i]).append(",");
                } else {
                    sb.append(i).append(",");
                }
            }
        }
        return sb.toString();
    }

    private void setDefault() {
        try {

            Config config = Config.getInstance();

            // If key not present, returns Integer.MIN_VALUE, which is
            // almost all zero.

            int options = config.getIntValue("libdefaults",
                    "kdc_default_options");

            if ((options & KDC_OPT_RENEWABLE_OK) == KDC_OPT_RENEWABLE_OK) {
                set(RENEWABLE_OK, true);
            } else {
                if (config.getBooleanValue("libdefaults", "renewable")) {
                    set(RENEWABLE_OK, true);
                }
            }
            if ((options & KDC_OPT_PROXIABLE) == KDC_OPT_PROXIABLE) {
                set(PROXIABLE, true);
            } else {
                if (config.getBooleanValue("libdefaults", "proxiable")) {
                    set(PROXIABLE, true);
                }
            }

            if ((options & KDC_OPT_FORWARDABLE) == KDC_OPT_FORWARDABLE) {
                set(FORWARDABLE, true);
            } else {
                if (config.getBooleanValue("libdefaults", "forwardable")) {
                    set(FORWARDABLE, true);
                }
            }
        } catch (KrbException e) {
            if (DEBUG) {
                System.out.println("Exception in getting default values for " +
                        "KDC Options from the configuration ");
                e.printStackTrace();

            }
        }
    }
}