/*

 * 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;

/**

 * This class encapsulates a AS-REP message that the KDC sends to the

 * client.

 */

public class KrbAsRep extends KrbKdcRep {

    private ASRep rep;

    private Credentials creds;

    private boolean DEBUG = Krb5.DEBUG;

    KrbAsRep(byte[] ibuf, EncryptionKey[] keys, KrbAsReq asReq) throws

    KrbException, Asn1Exception, IOException {

        if (keys == null)

            throw new KrbException(Krb5.API_INVALID_ARG);

        DerValue encoding = new DerValue(ibuf);

        ASReq req = asReq.getMessage();

        ASRep rep = null;

        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) {

                    System.out.println("KRBError received: " + eText);

                }

                // override default text with server text

                ke = new KrbException(err, eText);

            }

            ke.initCause(e);

            throw ke;

        }

        int encPartKeyType = rep.encPart.getEType();

        EncryptionKey dkey = EncryptionKey.findKey(encPartKeyType, keys);

        if (dkey == null) {

            throw new KrbException(Krb5.API_INVALID_ARG,

                "Cannot find key of appropriate type to decrypt AS REP - " +

                EType.toString(encPartKeyType));

        }

        byte[] enc_as_rep_bytes = rep.encPart.decrypt(dkey,

            KeyUsage.KU_ENC_AS_REP_PART);

        encoding = new DerValue(enc_as_rep_part);

        EncASRepPart enc_part = new EncASRepPart(encoding);

        rep.ticket.sname.setRealm(rep.ticket.realm);

        rep.encKDCRepPart = enc_part;

        check(req, rep);

        creds = new Credentials(

                                rep.ticket,

                                req.reqBody.cname,

                                rep.ticket.sname,

                                enc_part.key,

                                enc_part.flags,

                                enc_part.authtime,

                                enc_part.starttime,

                                enc_part.endtime,

                                enc_part.renewTill,

                                enc_part.caddr);

        if (DEBUG) {

            System.out.println(">>> KrbAsRep cons in KrbAsReq.getReply " +

                               req.reqBody.cname.getNameString());

        }

        this.rep = rep;

        this.creds = creds;

    }

    public Credentials getCreds() {

        return creds;

    }

    // made public for Kinit

    public sun.security.krb5.internal.ccache.Credentials setCredentials() {

        return new sun.security.krb5.internal.ccache.Credentials(rep);

    }

}