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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +/* | |
| 27 | + * | |
| 28 | + * (C) Copyright IBM Corp. 1999 All Rights Reserved. | |
| 29 | + * Copyright 1997 The Open Group Research Institute. All rights reserved. | |
| 30 | + */ | |
| 31 | + | |
| 32 | +package sun.security.krb5; | |
| 33 | + | |
| 34 | +import sun.security.krb5.internal.*; | |
| 35 | +import sun.security.krb5.internal.crypto.KeyUsage; | |
| 36 | +import sun.security.util.*; | |
| 37 | +import java.io.IOException; | |
| 38 | + | |
| 39 | +/** | |
| 40 | + * This class encapsulates a KRB-AP-REP sent from the service to the | |
| 41 | + * client. | |
| 42 | + */ | |
| 43 | +public class KrbApRep { | |
| 44 | + private byte[] obuf; | |
| 45 | + private byte[] ibuf; | |
| 46 | + private EncAPRepPart encPart; // although in plain text | |
| 47 | + private APRep apRepMessg; | |
| 48 | + | |
| 49 | + /** | |
| 50 | + * Constructs a KRB-AP-REP to send to a client. | |
| 51 | + * @throws KrbException | |
| 52 | + * @throws IOException | |
| 53 | + */ | |
| 54 | + // Used in AcceptSecContextToken | |
| 55 | + public KrbApRep(KrbApReq incomingReq, | |
| 56 | + boolean useSeqNumber, | |
| 57 | + boolean useSubKey) throws KrbException, IOException { | |
| 58 | + | |
| 59 | + EncryptionKey subKey = | |
| 60 | + (useSubKey? | |
| 61 | + new EncryptionKey(incomingReq.getCreds().getSessionKey()):null); | |
| 62 | + SeqNumber seqNum = new LocalSeqNumber(); | |
| 63 | + | |
| 64 | + init(incomingReq, subKey, seqNum); | |
| 65 | + } | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * Constructs a KRB-AP-REQ from the bytes received from a service. | |
| 69 | + * @throws KrbException | |
| 70 | + * @throws IOException | |
| 71 | + */ | |
| 72 | + // Used in AcceptSecContextToken | |
| 73 | + public KrbApRep(byte[] message, Credentials tgtCreds, | |
| 74 | + KrbApReq outgoingReq) throws KrbException, IOException { | |
| 75 | + this(message, tgtCreds); | |
| 76 | + authenticate(outgoingReq); | |
| 77 | + } | |
| 78 | + | |
| 79 | + private void init(KrbApReq apReq, | |
| 80 | + EncryptionKey subKey, | |
| 81 | + SeqNumber seqNumber) | |
| 82 | + throws KrbException, IOException { | |
| 83 | + createMessage( | |
| 84 | + apReq.getCreds().key, | |
| 85 | + apReq.getCtime(), | |
| 86 | + apReq.cusec(), | |
| 87 | + subKey, | |
| 88 | + seqNumber); | |
| 89 | + obuf = apRepMessg.asn1Encode(); | |
| 90 | + } | |
| 91 | + | |
| 92 | + | |
| 93 | + /** | |
| 94 | + * Constructs a KrbApRep object. | |
| 95 | + * @param msg a byte array of reply message. | |
| 96 | + * @param tgs_creds client's credential. | |
| 97 | + * @exception KrbException | |
| 98 | + * @exception IOException | |
| 99 | + */ | |
| 100 | + private KrbApRep(byte[] msg, Credentials tgs_creds) | |
| 101 | + throws KrbException, IOException { | |
| 102 | + this(new DerValue(msg), tgs_creds); | |
| 103 | + } | |
| 104 | + | |
| 105 | + /** | |
| 106 | + * Constructs a KrbApRep object. | |
| 107 | + * @param msg a byte array of reply message. | |
| 108 | + * @param tgs_creds client's credential. | |
| 109 | + * @exception KrbException | |
| 110 | + * @exception IOException | |
| 111 | + */ | |
| 112 | + private KrbApRep(DerValue encoding, Credentials tgs_creds) | |
| 113 | + throws KrbException, IOException { | |
| 114 | + APRep rep = null; | |
| 115 | + try { | |
| 116 | + rep = new APRep(encoding); | |
| 117 | + } catch (Asn1Exception e) { | |
| 118 | + rep = null; | |
| 119 | + KRBError err = new KRBError(encoding); | |
| 120 | + String errStr = err.getErrorString(); | |
| 121 | + String eText; | |
| 122 | + if (errStr.charAt(errStr.length() - 1) == 0) | |
| 123 | + eText = errStr.substring(0, errStr.length() - 1); | |
| 124 | + else | |
| 125 | + eText = errStr; | |
| 126 | + KrbException ke = new KrbException(err.getErrorCode(), eText); | |
| 127 | + ke.initCause(e); | |
| 128 | + throw ke; | |
| 129 | + } | |
| 130 | + | |
| 131 | + byte[] temp = rep.encPart.decrypt(tgs_creds.key, | |
| 132 | + KeyUsage.KU_ENC_AP_REP_PART); | |
| 133 | + byte[] enc_ap_rep_part = rep.encPart.reset(temp); | |
| 134 | + | |
| 135 | + encoding = new DerValue(enc_ap_rep_part); | |
| 136 | + encPart = new EncAPRepPart(encoding); | |
| 137 | + } | |
| 138 | + | |
| 139 | + private void authenticate(KrbApReq apReq) | |
| 140 | + throws KrbException, IOException { | |
| 141 | + if (encPart.ctime.getSeconds() != apReq.getCtime().getSeconds() || | |
| 142 | + encPart.cusec != apReq.getCtime().getMicroSeconds()) | |
| 143 | + throw new KrbApErrException(Krb5.KRB_AP_ERR_MUT_FAIL); | |
| 144 | + } | |
| 145 | + | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Returns the optional subkey stored in | |
| 149 | + * this message. Returns null if none is stored. | |
| 150 | + */ | |
| 151 | + public EncryptionKey getSubKey() { | |
| 152 | + // XXX Can encPart be null | |
| 153 | + return encPart.getSubKey(); | |
| 154 | + | |
| 155 | + } | |
| 156 | + | |
| 157 | + /** | |
| 158 | + * Returns the optional sequence number stored in the | |
| 159 | + * this message. Returns null if none is stored. | |
| 160 | + */ | |
| 161 | + public Integer getSeqNumber() { | |
| 162 | + // XXX Can encPart be null | |
| 163 | + return encPart.getSeqNumber(); | |
| 164 | + } | |
| 165 | + | |
| 166 | + /** | |
| 167 | + * Returns the ASN.1 encoding that should be sent to the peer. | |
| 168 | + */ | |
| 169 | + public byte[] getMessage() { | |
| 170 | + return obuf; | |
| 171 | + } | |
| 172 | + | |
| 173 | + private void createMessage( | |
| 174 | + EncryptionKey key, | |
| 175 | + KerberosTime ctime, | |
| 176 | + int cusec, | |
| 177 | + EncryptionKey subKey, | |
| 178 | + SeqNumber seqNumber) | |
| 179 | + throws Asn1Exception, IOException, | |
| 180 | + KdcErrException, KrbCryptoException { | |
| 181 | + | |
| 182 | + Integer seqno = null; | |
| 183 | + | |
| 184 | + if (seqNumber != null) | |
| 185 | + seqno = new Integer(seqNumber.current()); | |
| 186 | + | |
| 187 | + encPart = new EncAPRepPart(ctime, | |
| 188 | + cusec, | |
| 189 | + subKey, | |
| 190 | + seqno); | |
| 191 | + | |
| 192 | + byte[] encPartEncoding = encPart.asn1Encode(); | |
| 193 | + | |
| 194 | + EncryptedData encEncPart = new EncryptedData(key, encPartEncoding, | |
| 195 | + KeyUsage.KU_ENC_AP_REP_PART); | |
| 196 | + | |
| 197 | + apRepMessg = new APRep(encEncPart); | |
| 198 | + } | |
| 199 | + | |
| 200 | +} | |