J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.security.jgss.krb5; |
| 27 | |
| 28 | import org.ietf.jgss.*; |
| 29 | import java.io.InputStream; |
| 30 | import java.io.OutputStream; |
| 31 | import java.io.IOException; |
| 32 | import java.io.ByteArrayInputStream; |
| 33 | import sun.security.krb5.*; |
| 34 | |
| 35 | class AcceptSecContextToken extends InitialToken { |
| 36 | |
| 37 | private KrbApRep apRep = null; |
| 38 | |
| 39 | /** |
| 40 | * Creates an AcceptSecContextToken for the context acceptor to send to |
| 41 | * the context initiator. |
| 42 | */ |
| 43 | public AcceptSecContextToken(Krb5Context context, |
| 44 | KrbApReq apReq) |
| 45 | throws KrbException, IOException { |
| 46 | |
| 47 | /* |
| 48 | * RFC 1964, section 1.2 states: |
| 49 | * (1) context key: uses Kerberos session key (or subkey, if |
| 50 | * present in authenticator emitted by context initiator) directly |
| 51 | * |
| 52 | * This does not mention context acceptor. Hence we will not |
| 53 | * generate a subkey on the acceptor side. Note: Our initiator will |
| 54 | * still allow another acceptor to generate a subkey, even though |
| 55 | * our acceptor does not do so. |
| 56 | */ |
| 57 | boolean useSubkey = false; |
| 58 | |
| 59 | boolean useSequenceNumber = true; |
| 60 | |
| 61 | apRep = new KrbApRep(apReq, useSequenceNumber, useSubkey); |
| 62 | |
| 63 | context.resetMySequenceNumber(apRep.getSeqNumber().intValue()); |
| 64 | |
| 65 | /* |
| 66 | * Note: The acceptor side context key was set when the |
| 67 | * InitSecContextToken was received. |
| 68 | */ |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Creates an AcceptSecContextToken at the context initiator's side |
| 73 | * using the bytes received from the acceptor. |
| 74 | */ |
| 75 | public AcceptSecContextToken(Krb5Context context, |
| 76 | Credentials serviceCreds, KrbApReq apReq, |
| 77 | InputStream is) |
| 78 | throws IOException, GSSException, KrbException { |
| 79 | |
| 80 | int tokenId = ((is.read()<<8) | is.read()); |
| 81 | |
| 82 | if (tokenId != Krb5Token.AP_REP_ID) |
| 83 | throw new GSSException(GSSException.DEFECTIVE_TOKEN, -1, |
| 84 | "AP_REP token id does not match!"); |
| 85 | |
| 86 | byte[] apRepBytes = |
| 87 | new sun.security.util.DerValue(is).toByteArray(); |
| 88 | |
| 89 | KrbApRep apRep = new KrbApRep(apRepBytes, serviceCreds, apReq); |
| 90 | |
| 91 | /* |
| 92 | * Allow the context acceptor to set a subkey if desired, even |
| 93 | * though our context acceptor will not do so. |
| 94 | */ |
| 95 | EncryptionKey subKey = apRep.getSubKey(); |
| 96 | if (subKey != null) { |
| 97 | context.setKey(subKey); |
| 98 | /* |
| 99 | System.out.println("\n\nSub-Session key from AP-REP is: " + |
| 100 | getHexBytes(subKey.getBytes()) + "\n"); |
| 101 | */ |
| 102 | } |
| 103 | |
| 104 | Integer apRepSeqNumber = apRep.getSeqNumber(); |
| 105 | int peerSeqNumber = (apRepSeqNumber != null ? |
| 106 | apRepSeqNumber.intValue() : |
| 107 | 0); |
| 108 | context.resetPeerSequenceNumber(peerSeqNumber); |
| 109 | } |
| 110 | |
| 111 | public final byte[] encode() throws IOException { |
| 112 | byte[] apRepBytes = apRep.getMessage(); |
| 113 | byte[] retVal = new byte[2 + apRepBytes.length]; |
| 114 | writeInt(Krb5Token.AP_REP_ID, retVal, 0); |
| 115 | System.arraycopy(apRepBytes, 0, retVal, 2, apRepBytes.length); |
| 116 | return retVal; |
| 117 | } |
| 118 | } |