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security » sun » security » krb5 » internal » AuthorizationData.java
/*
 * 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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @(#)AuthorizationData.java  1.21 07/04/27
 *
 *  (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.util.*;
import sun.security.krb5.Asn1Exception; 
import java.util.Vector;
import java.io.IOException;
import sun.security.krb5.internal.ccache.CCacheOutputStream;

/**
 * In RFC4120, the ASN.1 AuthorizationData is defined as:
 *
 * AuthorizationData    ::= SEQUENCE OF SEQUENCE {
 *    ad-type    [0] Int32,
 *    ad-data    [1] OCTET STRING
 * }
 *
 * Here, two classes are used to implement it and they can be represented as follows:
 *
 * AuthorizationData ::= SEQUENCE OF AuthorizationDataEntry
 * AuthorizationDataEntry ::= SEQUENCE { 
 *      ad-type[0]  Int32,
 *              ad-data[1]  OCTET STRING
 * }
 */
public class AuthorizationData implements Cloneable {
  private AuthorizationDataEntry[] entry = null;

  private AuthorizationData() {
  }

  public AuthorizationData(
    AuthorizationDataEntry[] new_entries
  ) throws IOException {
    if (new_entries != null) {
       entry = new AuthorizationDataEntry[new_entries.length];
       for (int i = 0; i < new_entries.length; i++) {
      if (new_entries[i] == null) {
         throw new IOException("Cannot create an AuthorizationData");
      } else {
         entry[i] = (AuthorizationDataEntry)new_entries[i].clone();
      }
       }
    }
  }

  public AuthorizationData(
    AuthorizationDataEntry new_entry
  ) {
    entry = new AuthorizationDataEntry[1];
    entry[0] = new_entry;
  }

  public Object clone() {
    AuthorizationData new_authorizationData =
      new AuthorizationData();
    if (entry != null) {
      new_authorizationData.entry =
        new AuthorizationDataEntry[entry.length];
      for (int i = 0; i < entry.length; i++)
        new_authorizationData.entry[i] =
          (AuthorizationDataEntry)entry[i].clone();
    }
    return new_authorizationData;
  }

  /**
   * Constructs a new <code>AuthorizationData,</code> instance.
   * @param der a single DER-encoded 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.
   */
  public AuthorizationData(DerValue der) throws Asn1Exception, IOException {
    Vector<AuthorizationDataEntry> v = 
                    new Vector<AuthorizationDataEntry> ();
    if (der.getTag() != DerValue.tag_Sequence) {
      throw new Asn1Exception(Krb5.ASN1_BAD_ID);
    }
    while (der.getData().available() > 0) {
      v.addElement(new AuthorizationDataEntry(der.getData().getDerValue()));
    }
    if (v.size() > 0) {
      entry = new AuthorizationDataEntry[v.size()];
      v.copyInto(entry);
    }
  }

  /**
   * Encodes an <code>AuthorizationData</code> object.
   * @return byte array of encoded <code>AuthorizationData</code> object.
   * @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 bytes = new DerOutputStream();
    DerValue der[] = new DerValue[entry.length];
    for (int i = 0; i < entry.length; i++) {
      der[i] = new DerValue(entry[i].asn1Encode());
    }
    bytes.putSequence(der);
    return bytes.toByteArray();
  }

    /**
     * Parse (unmarshal) an <code>AuthorizationData</code> object from a DER input stream.  
     * This form of parsing might be used when expanding a value which is part of
     * a constructed sequence and uses explicitly tagged 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.
     * @param data the Der input stream value, which contains one or more marshaled value.
     * @param explicitTag tag number.
     * @param optional indicates if this data field is optional
     * @return an instance of AuthorizationData.
     *
     */
  public static AuthorizationData parse(DerInputStream data, byte explicitTag, boolean optional) throws Asn1Exception, IOException{  
    if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != explicitTag)) {    
      return null;
    }
    DerValue der = data.getDerValue();
    if (explicitTag != (der.getTag() & (byte)0x1F))  {  
      throw new Asn1Exception(Krb5.ASN1_BAD_ID);
    }
    else {
      DerValue subDer = der.getData().getDerValue();
      return new AuthorizationData(subDer);
    }
  }
  
  /**
   * Writes <code>AuthorizationData</code> data fields to a output stream.
   *
   * @param cos a <code>CCacheOutputStream</code> to be written to.
   * @exception IOException if an I/O exception occurs.
   */
     public void writeAuth(CCacheOutputStream cos) throws IOException {
    for (int i = 0; i < entry.length; i++) {
      entry[i].writeEntry(cos);
    }
  }

    public String toString() {
  String retVal = "AuthorizationData:\n";
  for (int i = 0; i < entry.length; i++) {
      retVal += entry[i].toString();
  }
  return retVal;
    }
}

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