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         // Reply to a renewable request should be renewable, but if request does
  79         // not contain renewable, KDC is free to issue a renewable ticket (for
  80         // example, if ticket_lifetime is too big).
  81         if (req.reqBody.kdcOptions.get(KDCOptions.RENEWABLE) &&
  82                 !rep.encKDCRepPart.flags.get(KDCOptions.RENEWABLE)) {
  83             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
  84         }
  85 
  86         if ((req.reqBody.from == null) || req.reqBody.from.isZero()) {
  87             // verify this is allowed
  88             if ((rep.encKDCRepPart.starttime != null) &&
  89                     !rep.encKDCRepPart.starttime.inClockSkew()) {
  90                 rep.encKDCRepPart.key.destroy();
  91                 throw new KrbApErrException(Krb5.KRB_AP_ERR_SKEW);
  92             }
  93         }
  94 
  95         if ((req.reqBody.from != null) && !req.reqBody.from.isZero()) {
  96             // verify this is allowed
  97             if ((rep.encKDCRepPart.starttime != null) &&
  98                     !req.reqBody.from.equals(rep.encKDCRepPart.starttime)) {
  99                 rep.encKDCRepPart.key.destroy();
 100                 throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
 101             }
 102         }
 103 
 104         if (!req.reqBody.till.isZero() &&
 105                 rep.encKDCRepPart.endtime.greaterThan(req.reqBody.till)) {
 106             rep.encKDCRepPart.key.destroy();
 107             throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
 108         }
 109 
 110         if (req.reqBody.kdcOptions.get(KDCOptions.RENEWABLE)) {
 111             if (req.reqBody.rtime != null && !req.reqBody.rtime.isZero()) {
 112                 // verify this is required
 113                 if ((rep.encKDCRepPart.renewTill == null) ||
 114                         rep.encKDCRepPart.renewTill.greaterThan(req.reqBody.rtime)
 115                         ) {
 116                     rep.encKDCRepPart.key.destroy();
 117                     throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED);
 118                 }
 119             }
 120         }
 121     }
 122 }