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