| /* | |
| * 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; | |
| import static sun.security.krb5.internal.Krb5.DEBUG; | |
| 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 or an NT-ENTERPRISE cname in the request, 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) && | |
| req.reqBody.cname.getNameType() != | |
| PrincipalName.KRB_NT_ENTERPRISE) || | |
| !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 (DEBUG == null) { | |
| DEBUG.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); | |
| } | |
| 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); | |
| } | |
| } | |
| } | |
| // RFC 6806 - Section 11 mechanism check | |
| // The availability of the ENC-PA-REP flag in the KDC response is | |
| // mandatory on some cases (see Krb5.TKT_OPTS_ENC_PA_REP check above). | |
| if (rep.encKDCRepPart.flags.get(Krb5.TKT_OPTS_ENC_PA_REP)) { | |
| boolean reqPaReqEncPaRep = false; | |
| boolean repPaReqEncPaRepValid = false; | |
| if (req.pAData != null) { | |
| for (PAData pa : req.pAData) { | |
| if (pa.getType() == Krb5.PA_REQ_ENC_PA_REP) { | |
| // The KDC supports RFC 6806 and ENC-PA-REP was sent in | |
| // the request (AS-REQ). A valid checksum is now required. | |
| 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 (DEBUG != null) { | |
| e.printStackTrace(DEBUG.getPrintStream()); | |
| } | |
| } | |
| break; | |
| } | |
| } | |
| } | |
| if (reqPaReqEncPaRep && !repPaReqEncPaRepValid) { | |
| throw new KrbApErrException(Krb5.KRB_AP_ERR_MODIFIED); | |
| } | |
| } | |
| } | |
| } |