| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * |
| * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| */ |
| |
| package sun.security.krb5; |
| |
| import sun.security.krb5.internal.*; |
| import sun.security.krb5.internal.crypto.KeyUsage; |
| import sun.security.util.DerInputStream; |
| |
| abstract class KrbKdcRep { |
| |
| static void check( |
| boolean isAsReq, |
| KDCReq req, |
| KDCRep rep, |
| EncryptionKey replyKey |
| ) throws KrbApErrException { |
| |
| // cname change in AS-REP is allowed only if the client |
| // sent CANONICALIZE and the server supports RFC 6806 - Section 11 |
| // FAST scheme (ENC-PA-REP flag). |
| if (isAsReq && !req.reqBody.cname.equals(rep.cname) && |
| (!req.reqBody.kdcOptions.get(KDCOptions.CANONICALIZE) || |
| !rep.encKDCRepPart.flags.get(Krb5.TKT_OPTS_ENC_PA_REP))) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| |
| // sname change in TGS-REP is allowed only if client |
| // sent CANONICALIZE and new sname is a referral of |
| // the form krbtgt/TO-REALM.COM@FROM-REALM.COM. |
| if (!req.reqBody.sname.equals(rep.encKDCRepPart.sname)) { |
| String[] snameStrings = rep.encKDCRepPart.sname.getNameStrings(); |
| if (isAsReq || !req.reqBody.kdcOptions.get(KDCOptions.CANONICALIZE) || |
| snameStrings == null || snameStrings.length != 2 || |
| !snameStrings[0].equals(PrincipalName.TGS_DEFAULT_SRV_NAME) || |
| !rep.encKDCRepPart.sname.getRealmString().equals( |
| req.reqBody.sname.getRealmString())) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| } |
| |
| if (req.reqBody.getNonce() != rep.encKDCRepPart.nonce) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| |
| if ( |
| ((req.reqBody.addresses != null && rep.encKDCRepPart.caddr != null) && |
| !req.reqBody.addresses.equals(rep.encKDCRepPart.caddr))) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| |
| // We allow KDC to return a non-forwardable ticket if request has -f |
| for (int i = 2; i < 6; i++) { |
| if (req.reqBody.kdcOptions.get(i) != |
| rep.encKDCRepPart.flags.get(i)) { |
| if (Krb5.DEBUG) { |
| System.out.println("> KrbKdcRep.check: at #" + i |
| + ". request for " + req.reqBody.kdcOptions.get(i) |
| + ", received " + rep.encKDCRepPart.flags.get(i)); |
| } |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| } |
| |
| // Reply to a renewable request should be renewable, but if request does |
| // not contain renewable, KDC is free to issue a renewable ticket (for |
| // example, if ticket_lifetime is too big). |
| if (req.reqBody.kdcOptions.get(KDCOptions.RENEWABLE) && |
| !rep.encKDCRepPart.flags.get(KDCOptions.RENEWABLE)) { |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| |
| if ((req.reqBody.from == null) || req.reqBody.from.isZero()) { |
| // verify this is allowed |
| if ((rep.encKDCRepPart.starttime != null) && |
| !rep.encKDCRepPart.starttime.inClockSkew()) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_SKEW); |
| } |
| } |
| |
| if ((req.reqBody.from != null) && !req.reqBody.from.isZero()) { |
| // verify this is allowed |
| if ((rep.encKDCRepPart.starttime != null) && |
| !req.reqBody.from.equals(rep.encKDCRepPart.starttime)) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| } |
| |
| if (!req.reqBody.till.isZero() && |
| rep.encKDCRepPart.endtime.greaterThan(req.reqBody.till)) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| |
| // RFC 6806 - Section 11 mechanism check |
| if (rep.encKDCRepPart.flags.get(Krb5.TKT_OPTS_ENC_PA_REP) && |
| req.reqBody.kdcOptions.get(KDCOptions.CANONICALIZE)) { |
| boolean reqPaReqEncPaRep = false; |
| boolean repPaReqEncPaRepValid = false; |
| |
| // PA_REQ_ENC_PA_REP only required for AS requests |
| for (PAData pa : req.pAData) { |
| if (pa.getType() == Krb5.PA_REQ_ENC_PA_REP) { |
| reqPaReqEncPaRep = true; |
| break; |
| } |
| } |
| |
| if (rep.encKDCRepPart.pAData != null) { |
| for (PAData pa : rep.encKDCRepPart.pAData) { |
| if (pa.getType() == Krb5.PA_REQ_ENC_PA_REP) { |
| try { |
| Checksum repCksum = new Checksum( |
| new DerInputStream( |
| pa.getValue()).getDerValue()); |
| // The checksum is inside encKDCRepPart so we don't |
| // care if it's keyed or not. |
| repPaReqEncPaRepValid = |
| repCksum.verifyAnyChecksum( |
| req.asn1Encode(), replyKey, |
| KeyUsage.KU_AS_REQ); |
| } catch (Exception e) { |
| if (Krb5.DEBUG) { |
| e.printStackTrace(); |
| } |
| } |
| break; |
| } |
| } |
| } |
| |
| if (reqPaReqEncPaRep && !repPaReqEncPaRepValid) { |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| } |
| |
| if (req.reqBody.kdcOptions.get(KDCOptions.RENEWABLE)) { |
| if (req.reqBody.rtime != null && !req.reqBody.rtime.isZero()) { |
| // verify this is required |
| if ((rep.encKDCRepPart.renewTill == null) || |
| rep.encKDCRepPart.renewTill.greaterThan(req.reqBody.rtime) |
| ) { |
| rep.encKDCRepPart.key.destroy(); |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); |
| } |
| |
| } |
| } |
| } |
| } |
