1/*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.  Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25/*
26 *
27 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
28 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
29 */
30
31package sun.security.krb5.internal;
32
33import sun.security.krb5.Checksum;
34import sun.security.krb5.Asn1Exception;
35import sun.security.krb5.RealmException;
36import sun.security.util.*;
37import java.io.IOException;
38import java.math.BigInteger;
39
40/**
41 * Implements the ASN.1 KRBSafe type.
42 *
43 * <pre>{@code
44 * KRB-SAFE        ::= [APPLICATION 20] SEQUENCE {
45 *         pvno            [0] INTEGER (5),
46 *         msg-type        [1] INTEGER (20),
47 *         safe-body       [2] KRB-SAFE-BODY,
48 *         cksum           [3] Checksum
49 * }
50 * }</pre>
51 *
52 * <p>
53 * This definition reflects the Network Working Group RFC 4120
54 * specifications available at
55 * <a href="http://www.ietf.org/rfc/rfc4120.txt">
56 * http://www.ietf.org/rfc/rfc4120.txt</a>.
57 */
58
59public class KRBSafe {
60    public int pvno;
61    public int msgType;
62    public KRBSafeBody safeBody;
63    public Checksum cksum;
64
65    public KRBSafe(KRBSafeBody new_safeBody, Checksum new_cksum) {
66        pvno = Krb5.PVNO;
67        msgType = Krb5.KRB_SAFE;
68        safeBody = new_safeBody;
69        cksum = new_cksum;
70    }
71
72    public KRBSafe(byte[] data) throws Asn1Exception,
73    RealmException, KrbApErrException, IOException {
74        init(new DerValue(data));
75    }
76
77    public KRBSafe(DerValue encoding) throws Asn1Exception,
78    RealmException, KrbApErrException, IOException {
79        init(encoding);
80    }
81
82    /**
83     * Initializes an KRBSafe object.
84     * @param encoding a single DER-encoded value.
85     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
86     * @exception IOException if an I/O error occurs while reading encoded data.
87     * @exception RealmException if an error occurs while parsing a Realm object.
88     * @exception KrbApErrException if the value read from the DER-encoded data
89     *  stream does not match the pre-defined value.
90     */
91    private void init(DerValue encoding) throws Asn1Exception,
92    RealmException, KrbApErrException, IOException {
93        DerValue der, subDer;
94        if (((encoding.getTag() & (byte)0x1F) != (byte)0x14)
95            || (encoding.isApplication() != true)
96            || (encoding.isConstructed() != true))
97            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
98        der = encoding.getData().getDerValue();
99        if (der.getTag() != DerValue.tag_Sequence)
100            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
101        subDer = der.getData().getDerValue();
102        if ((subDer.getTag() & 0x1F) == 0x00) {
103            pvno = subDer.getData().getBigInteger().intValue();
104            if (pvno != Krb5.PVNO)
105                throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION);
106        }
107        else
108            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
109        subDer = der.getData().getDerValue();
110        if ((subDer.getTag() & 0x1F) == 0x01) {
111            msgType = subDer.getData().getBigInteger().intValue();
112            if (msgType != Krb5.KRB_SAFE)
113                throw new KrbApErrException(Krb5.KRB_AP_ERR_MSG_TYPE);
114        }
115
116        else
117            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
118        safeBody = KRBSafeBody.parse(der.getData(), (byte)0x02, false);
119        cksum = Checksum.parse(der.getData(), (byte)0x03, false);
120        if (der.getData().available() > 0)
121            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
122    }
123
124    /**
125     * Encodes an KRBSafe object.
126     * @return byte array of encoded KRBSafe object.
127     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
128     * @exception IOException if an I/O error occurs while reading encoded data.
129     */
130    public byte[] asn1Encode() throws Asn1Exception, IOException {
131        DerOutputStream temp = new DerOutputStream();
132        DerOutputStream bytes = new DerOutputStream();
133        temp.putInteger(BigInteger.valueOf(pvno));
134        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp);
135        temp = new DerOutputStream();
136        temp.putInteger(BigInteger.valueOf(msgType));
137        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp);
138        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x02), safeBody.asn1Encode());
139        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x03), cksum.asn1Encode());
140        temp = new DerOutputStream();
141        temp.write(DerValue.tag_Sequence, bytes);
142        bytes = new DerOutputStream();
143        bytes.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte)0x14), temp);
144        return bytes.toByteArray();
145    }
146}
147