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 
  31 package sun.security.krb5;
  32 
  33 import sun.security.krb5.internal.*;
  34 
  35 abstract class KrbKdcRep {
  36 
  37     static void check(
  38                       boolean isAsReq,
  39                       KDCReq req,
  40                       KDCRep rep
  41                       ) throws KrbApErrException {
  42 
  43         if (isAsReq && !req.reqBody.cname.equals(rep.cname)) {
  44             rep.encKDCRepPart.key.destroy();
  45             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  46         }
  47 
  48         if (!req.reqBody.sname.equals(rep.encKDCRepPart.sname)) {
  49             rep.encKDCRepPart.key.destroy();
  50             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  51         }
  52 
  53         if (req.reqBody.getNonce() != rep.encKDCRepPart.nonce) {
  54             rep.encKDCRepPart.key.destroy();
  55             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  56         }
  57 
  58         if (
  59             ((req.reqBody.addresses != null && rep.encKDCRepPart.caddr != null) &&
  60              !req.reqBody.addresses.equals(rep.encKDCRepPart.caddr))) {
  61             rep.encKDCRepPart.key.destroy();
  62             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  63         }
  64 
  65         // We allow KDC to return a non-forwardable ticket if request has -f
  66         for (int i = 2; i < 6; i++) {
  67             if (req.reqBody.kdcOptions.get(i) !=
  68                    rep.encKDCRepPart.flags.get(i)) {
  69                 if (Krb5.DEBUG) {
  70                     System.out.println("> KrbKdcRep.check: at #" + i
  71                             + ". request for " + req.reqBody.kdcOptions.get(i)
  72                             + ", received " + rep.encKDCRepPart.flags.get(i));
  73                 }
  74                 throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  75             }
  76         }
  77 
  78         // XXX Can renew a ticket but not ask for a renewable renewed ticket
  79         // See impl of Credentials.renew().
  80         if (req.reqBody.kdcOptions.get(KDCOptions.RENEWABLE) !=
  81             rep.encKDCRepPart.flags.get(KDCOptions.RENEWABLE)) {
  82             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  83         }
  84         if ((req.reqBody.from == null) || req.reqBody.from.isZero())
  85             // verify this is allowed
  86             if ((rep.encKDCRepPart.starttime != null) &&
  87                 !rep.encKDCRepPart.starttime.inClockSkew()) {
  88                 rep.encKDCRepPart.key.destroy();
  89                 throw new KrbApErrException(Krb5.KRB_AP_ERR_SKEW);
  90             }
  91 
  92         if ((req.reqBody.from != null) && !req.reqBody.from.isZero())
  93             // verify this is allowed
  94             if ((rep.encKDCRepPart.starttime != null) &&
  95                 !req.reqBody.from.equals(rep.encKDCRepPart.starttime)) {
  96                 rep.encKDCRepPart.key.destroy();
  97                 throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  98             }
  99 
 100         if (!req.reqBody.till.isZero() &&
 101             rep.encKDCRepPart.endtime.greaterThan(req.reqBody.till)) {
 102             rep.encKDCRepPart.key.destroy();
 103             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
 104         }
 105 
 106         if (req.reqBody.kdcOptions.get(KDCOptions.RENEWABLE))
 107             if (req.reqBody.rtime != null && !req.reqBody.rtime.isZero())
 108                                 // verify this is required
 109                 if ((rep.encKDCRepPart.renewTill == null) ||
 110                     rep.encKDCRepPart.renewTill.greaterThan(req.reqBody.rtime)
 111                     ) {
 112                     rep.encKDCRepPart.key.destroy();
 113                     throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
 114                 }
 115 
 116         if (req.reqBody.kdcOptions.get(KDCOptions.RENEWABLE_OK) &&
 117             rep.encKDCRepPart.flags.get(KDCOptions.RENEWABLE))
 118             if (!req.reqBody.till.isZero())
 119                                 // verify this is required
 120                 if ((rep.encKDCRepPart.renewTill == null) ||
 121                     rep.encKDCRepPart.renewTill.greaterThan(req.reqBody.till)
 122                     ) {
 123                     rep.encKDCRepPart.key.destroy();
 124                     throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
 125                 }
 126     }
 127 
 128 
 129 }