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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 | } | ||