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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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*
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* (C) Copyright IBM Corp. 1999 All Rights Reserved.
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* Copyright 1997 The Open Group Research Institute. All rights reserved.
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*/
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package sun.security.krb5.internal;
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import sun.security.krb5.Config;
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import sun.security.krb5.KrbException;
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import sun.security.krb5.Asn1Exception;
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import sun.security.krb5.internal.util.KerberosFlags;
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import sun.security.util.*;
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import java.io.IOException;
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/**
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* Implements the ASN.1 KDCOptions type.
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*
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* <xmp>
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* KDCOptions ::= KerberosFlags
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* -- reserved(0),
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* -- forwardable(1),
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* -- forwarded(2),
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* -- proxiable(3),
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* -- proxy(4),
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* -- allow-postdate(5),
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* -- postdated(6),
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* -- unused7(7),
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* -- renewable(8),
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* -- unused9(9),
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* -- unused10(10),
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* -- opt-hardware-auth(11),
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* -- unused12(12),
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* -- unused13(13),
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* -- 15 is reserved for canonicalize
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* -- unused15(15),
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* -- 26 was unused in 1510
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* -- disable-transited-check(26),
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* -- renewable-ok(27),
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* -- enc-tkt-in-skey(28),
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* -- renew(30),
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* -- validate(31)
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*
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* KerberosFlags ::= BIT STRING (SIZE (32..MAX))
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* -- minimum number of bits shall be sent,
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* -- but no fewer than 32
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*
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* </xmp>
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*
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* <p>
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* This definition reflects the Network Working Group RFC 4120
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* specification available at
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* <a href="http://www.ietf.org/rfc/rfc4120.txt">
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* http://www.ietf.org/rfc/rfc4120.txt</a>.
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*
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* <p>
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* This class appears as data field in the initial request(KRB_AS_REQ)
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* or subsequent request(KRB_TGS_REQ) to the KDC and indicates the flags
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* that the client wants to set on the tickets.
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*
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* The optional bits are:
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* <UL>
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* <LI>KDCOptions.RESERVED
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* <LI>KDCOptions.FORWARDABLE
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* <LI>KDCOptions.FORWARDED
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* <LI>KDCOptions.PROXIABLE
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* <LI>KDCOptions.PROXY
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* <LI>KDCOptions.ALLOW_POSTDATE
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* <LI>KDCOptions.POSTDATED
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* <LI>KDCOptions.RENEWABLE
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* <LI>KDCOptions.RENEWABLE_OK
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* <LI>KDCOptions.ENC_TKT_IN_SKEY
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* <LI>KDCOptions.RENEW
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* <LI>KDCOptions.VALIDATE
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* </UL>
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* <p> Various checks must be made before honoring an option. The restrictions
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* on the use of some options are as follows:
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* <ol>
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* <li> FORWARDABLE, FORWARDED, PROXIABLE, RENEWABLE options may be set in
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* subsequent request only if the ticket_granting ticket on which it is based has
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* the same options (FORWARDABLE, FORWARDED, PROXIABLE, RENEWABLE) set.
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* <li> ALLOW_POSTDATE may be set in subsequent request only if the
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* ticket-granting ticket on which it is based also has its MAY_POSTDATE flag set.
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* <li> POSTDATED may be set in subsequent request only if the
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* ticket-granting ticket on which it is based also has its MAY_POSTDATE flag set.
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* <li> RENEWABLE or RENEW may be set in subsequent request only if the
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* ticket-granting ticket on which it is based also has its RENEWABLE flag set.
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* <li> POXY may be set in subsequent request only if the ticket-granting ticket
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* on which it is based also has its PROXIABLE flag set, and the address(es) of
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* the host from which the resulting ticket is to be valid should be included
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* in the addresses field of the request.
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* <li>FORWARDED, PROXY, ENC_TKT_IN_SKEY, RENEW, VALIDATE are used only in
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* subsequent requests.
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* </ol><p>
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*/
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public class KDCOptions extends KerberosFlags {
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public final int KDC_OPT_PROXIABLE = 0x10000000;
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public final int KDC_OPT_RENEWABLE_OK = 0x00000010;
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public final int KDC_OPT_FORWARDABLE = 0x40000000;
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// KDC Options
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public static final int RESERVED = 0;
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public static final int FORWARDABLE = 1;
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public static final int FORWARDED = 2;
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public static final int PROXIABLE = 3;
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public static final int PROXY = 4;
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public static final int ALLOW_POSTDATE = 5;
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public static final int POSTDATED = 6;
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public static final int UNUSED7 = 7;
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public static final int RENEWABLE = 8;
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public static final int UNUSED9 = 9;
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public static final int UNUSED10 = 10;
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public static final int UNUSED11 = 11;
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public static final int RENEWABLE_OK = 27;
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public static final int ENC_TKT_IN_SKEY = 28;
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public static final int RENEW = 30;
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public static final int VALIDATE = 31;
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private boolean DEBUG = Krb5.DEBUG;
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public KDCOptions() {
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super(Krb5.KDC_OPTS_MAX + 1);
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setDefault();
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}
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public KDCOptions(int size, byte[] data) throws Asn1Exception {
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super(size, data);
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if ((size > data.length * BITS_PER_UNIT) || (size > Krb5.KDC_OPTS_MAX + 1))
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throw new Asn1Exception(Krb5.BITSTRING_BAD_LENGTH);
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}
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/**
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* Constructs a KDCOptions from the specified bit settings.
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*
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* @param data the bits to be set for the KDCOptions.
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* @exception Asn1Exception if an error occurs while decoding an ASN1
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* encoded data.
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*
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*/
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public KDCOptions(boolean[] data) throws Asn1Exception {
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super(data);
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if (data.length > Krb5.KDC_OPTS_MAX + 1) {
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throw new Asn1Exception(Krb5.BITSTRING_BAD_LENGTH);
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}
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}
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public KDCOptions(DerValue encoding) throws Asn1Exception, IOException {
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this(encoding.getUnalignedBitString(true).toBooleanArray());
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}
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/**
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* Constructs a KDCOptions from the passed bit settings.
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*
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* @param options the bits to be set for the KDCOptions.
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*
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*/
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public KDCOptions(byte[] options) {
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super(options.length * BITS_PER_UNIT, options);
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}
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/**
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* Parse (unmarshal) a KDCOptions from a DER input stream. This form
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* parsing might be used when expanding a value which is part of
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* a constructed sequence and uses explicitly tagged type.
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*
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* @param data the Der input stream value, which contains one or more
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* marshaled value.
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* @param explicitTag tag number.
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* @param optional indicate if this data field is optional
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* @return an instance of KDCOptions.
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* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
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* @exception IOException if an I/O error occurs while reading encoded data.
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*
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*/
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public static KDCOptions parse(DerInputStream data, byte explicitTag, boolean optional) throws Asn1Exception, IOException {
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if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != explicitTag))
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return null;
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DerValue der = data.getDerValue();
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if (explicitTag != (der.getTag() & (byte)0x1F)) {
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throw new Asn1Exception(Krb5.ASN1_BAD_ID);
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} else {
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DerValue subDer = der.getData().getDerValue();
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return new KDCOptions(subDer);
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}
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}
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/**
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* Sets the value(true/false) for one of the <code>KDCOptions</code>.
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*
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* @param option an option bit.
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* @param value true if the option is selected, false if the option is not selected.
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* @exception ArrayIndexOutOfBoundsException if array index out of bound occurs.
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* @see sun.security.krb5.internal.Krb5
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*/
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public void set(int option, boolean value) throws ArrayIndexOutOfBoundsException {
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super.set(option, value);
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}
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/**
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* Gets the value(true/false) for one of the <code>KDCOptions</code>.
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*
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* @param option an option bit.
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* @return value true if the option is selected, false if the option is not selected.
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* @exception ArrayIndexOutOfBoundsException if array index out of bound occurs.
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* @see sun.security.krb5.internal.Krb5
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*/
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public boolean get(int option) throws ArrayIndexOutOfBoundsException {
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return super.get(option);
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}
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private void setDefault() {
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try {
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Config config = Config.getInstance();
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// If key not present, returns Integer.MIN_VALUE, which is
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// almost all zero.
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int options = config.getIntValue("libdefaults",
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"kdc_default_options");
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if ((options & RENEWABLE_OK) == RENEWABLE_OK) {
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set(RENEWABLE_OK, true);
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} else {
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if (config.getBooleanValue("libdefaults", "renewable")) {
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set(RENEWABLE_OK, true);
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}
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}
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if ((options & PROXIABLE) == PROXIABLE) {
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set(PROXIABLE, true);
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} else {
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if (config.getBooleanValue("libdefaults", "proxiable")) {
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set(PROXIABLE, true);
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}
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}
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if ((options & FORWARDABLE) == FORWARDABLE) {
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set(FORWARDABLE, true);
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} else {
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if (config.getBooleanValue("libdefaults", "forwardable")) {
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set(FORWARDABLE, true);
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}
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}
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} catch (KrbException e) {
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if (DEBUG) {
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System.out.println("Exception in getting default values for " +
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"KDC Options from the configuration ");
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e.printStackTrace();
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}
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}
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}
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}
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