| /* | |
| * Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved. | |
| * 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.krb5.internal.crypto.EType; | |
| import sun.security.util.*; | |
| import java.io.IOException; | |
| import java.util.Objects; | |
| import javax.security.auth.kerberos.KeyTab; | |
| import sun.security.jgss.krb5.Krb5Util; | |
| import static sun.security.krb5.internal.Krb5.DEBUG; | |
| /** | |
| * This class encapsulates a AS-REP message that the KDC sends to the | |
| * client. | |
| */ | |
| final class KrbAsRep extends KrbKdcRep { | |
| private ASRep rep; // The AS-REP message | |
| private Credentials creds; // The Credentials provide by the AS-REP | |
| // message, created by initiator after calling | |
| // the decrypt() method | |
| KrbAsRep(byte[] ibuf) throws | |
| KrbException, Asn1Exception, IOException { | |
| DerValue encoding = new DerValue(ibuf); | |
| try { | |
| rep = new ASRep(encoding); | |
| } catch (Asn1Exception e) { | |
| rep = null; | |
| KRBError err = new KRBError(encoding); | |
| String errStr = err.getErrorString(); | |
| String eText = null; // pick up text sent by the server (if any) | |
| if (errStr != null && errStr.length() > 0) { | |
| if (errStr.charAt(errStr.length() - 1) == 0) | |
| eText = errStr.substring(0, errStr.length() - 1); | |
| else | |
| eText = errStr; | |
| } | |
| KrbException ke; | |
| if (eText == null) { | |
| // no text sent from server | |
| ke = new KrbException(err); | |
| } else { | |
| if (DEBUG != null) { | |
| DEBUG.println("KRBError received: " + eText); | |
| } | |
| // override default text with server text | |
| ke = new KrbException(err, eText); | |
| } | |
| ke.initCause(e); | |
| throw ke; | |
| } | |
| } | |
| // KrbAsReqBuilder need to read back the PA for key generation | |
| PAData[] getPA() { | |
| return rep.pAData; | |
| } | |
| /** | |
| * Called by KrbAsReqBuilder to resolve a AS-REP message using a keytab. | |
| * @param ktab the keytab, not null | |
| * @param asReq the original AS-REQ sent, used to validate AS-REP | |
| * @param cname the user principal name, used to locate keys in ktab | |
| */ | |
| void decryptUsingKeyTab(KeyTab ktab, KrbAsReq asReq, PrincipalName cname) | |
| throws KrbException, Asn1Exception, IOException { | |
| EncryptionKey dkey = null; | |
| int encPartKeyType = rep.encPart.getEType(); | |
| Integer encPartKvno = rep.encPart.kvno; | |
| try { | |
| dkey = EncryptionKey.findKey(encPartKeyType, encPartKvno, | |
| Krb5Util.keysFromJavaxKeyTab(ktab, cname)); | |
| } catch (KrbException ke) { | |
| if (ke.returnCode() == Krb5.KRB_AP_ERR_BADKEYVER) { | |
| // Fallback to no kvno. In some cases, keytab is generated | |
| // not by sysadmin but Java's ktab command | |
| dkey = EncryptionKey.findKey(encPartKeyType, | |
| Krb5Util.keysFromJavaxKeyTab(ktab, cname)); | |
| } | |
| } | |
| if (dkey == null) { | |
| throw new KrbException(Krb5.API_INVALID_ARG, | |
| "Cannot find key for type/kvno to decrypt AS REP - " + | |
| EType.toString(encPartKeyType) + "/" + encPartKvno); | |
| } | |
| decrypt(dkey, asReq, cname); | |
| } | |
| /** | |
| * Called by KrbAsReqBuilder to resolve a AS-REP message using a password. | |
| * @param password user provided password. not null | |
| * @param asReq the original AS-REQ sent, used to validate AS-REP | |
| * @param cname the user principal name, used to provide salt | |
| */ | |
| void decryptUsingPassword(char[] password, | |
| KrbAsReq asReq, PrincipalName cname) | |
| throws KrbException, Asn1Exception, IOException { | |
| int encPartKeyType = rep.encPart.getEType(); | |
| EncryptionKey dkey = EncryptionKey.acquireSecretKey( | |
| cname, | |
| password, | |
| encPartKeyType, | |
| PAData.getSaltAndParams(encPartKeyType, rep.pAData)); | |
| decrypt(dkey, asReq, cname); | |
| } | |
| /** | |
| * Decrypts encrypted content inside AS-REP. Called by initiator. | |
| * @param dkey the decryption key to use | |
| * @param asReq the original AS-REQ sent, used to validate AS-REP | |
| */ | |
| private void decrypt(EncryptionKey dkey, KrbAsReq asReq, | |
| PrincipalName cname) | |
| throws KrbException, Asn1Exception, IOException { | |
| byte[] enc_as_rep_bytes = rep.encPart.decrypt(dkey, | |
| KeyUsage.KU_ENC_AS_REP_PART); | |
| byte[] enc_as_rep_part = rep.encPart.reset(enc_as_rep_bytes); | |
| DerValue encoding = new DerValue(enc_as_rep_part); | |
| EncASRepPart enc_part = new EncASRepPart(encoding); | |
| rep.encKDCRepPart = enc_part; | |
| ASReq req = asReq.getMessage(); | |
| check(true, req, rep, dkey); | |
| PrincipalName clientAlias = cname; | |
| if (clientAlias.equals(rep.cname)) | |
| clientAlias = null; | |
| creds = new Credentials( | |
| rep.ticket, | |
| rep.cname, | |
| clientAlias, | |
| enc_part.sname, | |
| null, // No server alias expected in a TGT | |
| enc_part.key, | |
| enc_part.flags, | |
| enc_part.authtime, | |
| enc_part.starttime, | |
| enc_part.endtime, | |
| enc_part.renewTill, | |
| enc_part.caddr); | |
| if (DEBUG != null) { | |
| DEBUG.println(">>> KrbAsRep cons in KrbAsReq.getReply " + | |
| req.reqBody.cname.getNameString()); | |
| } | |
| } | |
| Credentials getCreds() { | |
| return Objects.requireNonNull(creds, "Creds not available yet."); | |
| } | |
| sun.security.krb5.internal.ccache.Credentials getCCreds() { | |
| return new sun.security.krb5.internal.ccache.Credentials(rep); | |
| } | |
| } |