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/*
 *
 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
 */

package sun.security.krb5.internal;

import sun.security.krb5.*;
import java.util.Vector;
import sun.security.util.*;
import java.io.IOException;
import java.math.BigInteger;

Implements the ASN.1 KRB_KDC_REQ type.

KDC-REQ              ::= SEQUENCE {
     -- NOTE: first tag is [1], not [0]
     pvno            [1] INTEGER (5) ,
     msg-type        [2] INTEGER (10 -- AS -- | 12 -- TGS --),
     padata          [3] SEQUENCE OF PA-DATA OPTIONAL
                           -- NOTE: not empty --,
     req-body        [4] KDC-REQ-BODY
 }

This definition reflects the Network Working Group RFC 4120 specification available at http://www.ietf.org/rfc/rfc4120.txt.

/** * Implements the ASN.1 KRB_KDC_REQ type. * * <pre>{@code * KDC-REQ ::= SEQUENCE { * -- NOTE: first tag is [1], not [0] * pvno [1] INTEGER (5) , * msg-type [2] INTEGER (10 -- AS -- | 12 -- TGS --), * padata [3] SEQUENCE OF PA-DATA OPTIONAL * -- NOTE: not empty --, * req-body [4] KDC-REQ-BODY * } * }</pre> * * <p> * This definition reflects the Network Working Group RFC 4120 * specification available at * <a href="http://www.ietf.org/rfc/rfc4120.txt"> * http://www.ietf.org/rfc/rfc4120.txt</a>. */
public class KDCReq { public KDCReqBody reqBody; private int pvno; private int msgType; private PAData[] pAData = null; //optional public KDCReq(PAData[] new_pAData, KDCReqBody new_reqBody, int req_type) throws IOException { pvno = Krb5.PVNO; msgType = req_type; if (new_pAData != null) { pAData = new PAData[new_pAData.length]; for (int i = 0; i < new_pAData.length; i++) { if (new_pAData[i] == null) { throw new IOException("Cannot create a KDCRep"); } else { pAData[i] = (PAData) new_pAData[i].clone(); } } } reqBody = new_reqBody; } public KDCReq() { } public KDCReq(byte[] data, int req_type) throws Asn1Exception, IOException, KrbException { init(new DerValue(data), req_type); }
Creates an KDCReq object from a DerValue object and asn1 type.
Params:
  • der – a DER value of an KDCReq object.
  • req_type – a encoded asn1 type value.
Throws:
/** * Creates an KDCReq object from a DerValue object and asn1 type. * * @param der a DER value of an KDCReq object. * @param req_type a encoded asn1 type value. * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data. * @exception IOException if an I/O error occurs while reading encoded data. * @exception KrbErrException */
public KDCReq(DerValue der, int req_type) throws Asn1Exception, IOException, KrbException { init(der, req_type); }
Initializes a KDCReq object from a DerValue. The DER encoding must be in the format specified by the KRB_KDC_REQ ASN.1 notation.
Params:
  • encoding – a DER-encoded KDCReq object.
  • req_type – an int indicating whether it's KRB_AS_REQ or KRB_TGS_REQ type
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
  • KrbException – if an error occurs while constructing a Realm object, or a Krb object from DER-encoded data.
/** * Initializes a KDCReq object from a DerValue. The DER encoding * must be in the format specified by the KRB_KDC_REQ ASN.1 notation. * * @param encoding a DER-encoded KDCReq object. * @param req_type an int indicating whether it's KRB_AS_REQ or KRB_TGS_REQ type * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data. * @exception IOException if an I/O error occurs while reading encoded data. * @exception KrbException if an error occurs while constructing a Realm object, * or a Krb object from DER-encoded data. */
protected void init(DerValue encoding, int req_type) throws Asn1Exception, IOException, KrbException { DerValue der, subDer; BigInteger bint; if ((encoding.getTag() & 0x1F) != req_type) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } der = encoding.getData().getDerValue(); if (der.getTag() != DerValue.tag_Sequence) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } subDer = der.getData().getDerValue(); if ((subDer.getTag() & 0x01F) == 0x01) { bint = subDer.getData().getBigInteger(); this.pvno = bint.intValue(); if (this.pvno != Krb5.PVNO) { throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION); } } else { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } subDer = der.getData().getDerValue(); if ((subDer.getTag() & 0x01F) == 0x02) { bint = subDer.getData().getBigInteger(); this.msgType = bint.intValue(); if (this.msgType != req_type) { throw new KrbApErrException(Krb5.KRB_AP_ERR_MSG_TYPE); } } else { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } if ((der.getData().peekByte() & 0x1F) == 0x03) { subDer = der.getData().getDerValue(); DerValue subsubDer = subDer.getData().getDerValue(); if (subsubDer.getTag() != DerValue.tag_SequenceOf) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } Vector<PAData> v = new Vector<>(); while (subsubDer.getData().available() > 0) { v.addElement(new PAData(subsubDer.getData().getDerValue())); } if (v.size() > 0) { pAData = new PAData[v.size()]; v.copyInto(pAData); } } else { pAData = null; } subDer = der.getData().getDerValue(); if ((subDer.getTag() & 0x01F) == 0x04) { DerValue subsubDer = subDer.getData().getDerValue(); reqBody = new KDCReqBody(subsubDer, msgType); } else { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } }
Encodes this object to a byte array.
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
Returns:an byte array of encoded data.
/** * Encodes this object to a byte array. * * @return an byte array of encoded data. * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data. * @exception IOException if an I/O error occurs while reading encoded data. * */
public byte[] asn1Encode() throws Asn1Exception, IOException { DerOutputStream temp, bytes, out; temp = new DerOutputStream(); temp.putInteger(BigInteger.valueOf(pvno)); out = new DerOutputStream(); out.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x01), temp); temp = new DerOutputStream(); temp.putInteger(BigInteger.valueOf(msgType)); out.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x02), temp); if (pAData != null && pAData.length > 0) { temp = new DerOutputStream(); for (int i = 0; i < pAData.length; i++) { temp.write(pAData[i].asn1Encode()); } bytes = new DerOutputStream(); bytes.write(DerValue.tag_SequenceOf, temp); out.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x03), bytes); } out.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x04), reqBody.asn1Encode(msgType)); bytes = new DerOutputStream(); bytes.write(DerValue.tag_Sequence, out); out = new DerOutputStream(); out.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte) msgType), bytes); return out.toByteArray(); } public byte[] asn1EncodeReqBody() throws Asn1Exception, IOException { return reqBody.asn1Encode(msgType); } }