1 /*

     2  * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package sun.security.ssl;

    27 

    28 import java.io.IOException;

    29 import java.io.PrintStream;

    30 import java.security.AccessController;

    31 import java.security.AccessControlContext;

    32 import java.security.Principal;

    33 import java.security.PrivilegedAction;

    34 import java.security.SecureRandom;

    35 import javax.crypto.SecretKey;

    36 

    37 /**

    38  * A helper class that calls the KerberosClientKeyExchange implementation.

    39  */

    40 public class KerberosClientKeyExchange extends HandshakeMessage {

    41 

    42     private static final String IMPL_CLASS =

    43         "sun.security.ssl.krb5.KerberosClientKeyExchangeImpl";

    44 

    45     private static final Class<?> implClass = AccessController.doPrivileged(

    46             new PrivilegedAction<Class<?>>() {

    47                 @Override

    48                 public Class<?> run() {

    49                     try {

    50                         return Class.forName(IMPL_CLASS, true, null);

    51                     } catch (ClassNotFoundException cnf) {

    52                         return null;

    53                     }

    54                 }

    55             }

    56         );

    57     private final KerberosClientKeyExchange impl = createImpl();

    58 

    59     private KerberosClientKeyExchange createImpl() {

    60         if (implClass != null &&

    61                 getClass() == KerberosClientKeyExchange.class) {

    62             try {

    63                 return (KerberosClientKeyExchange)implClass.newInstance();

    64             } catch (InstantiationException e) {

    65                 throw new AssertionError(e);

    66             } catch (IllegalAccessException e) {

    67                 throw new AssertionError(e);

    68             }

    69         }

    70         return null;

    71     }

    72 

    73     // This constructor will be called when constructing an instance of its

    74     // subclass -- KerberosClientKeyExchangeImpl.  Please won't check the

    75     // value of impl variable in this constructor.

    76     protected KerberosClientKeyExchange() {

    77         // please won't check the value of impl variable

    78     }

    79 

    80     public KerberosClientKeyExchange(String serverName,

    81         AccessControlContext acc, ProtocolVersion protocolVersion,

    82         SecureRandom rand) throws IOException {

    83 

    84         if (impl != null) {

    85             init(serverName, acc, protocolVersion, rand);

    86         } else {

    87             throw new IllegalStateException("Kerberos is unavailable");

    88         }

    89     }

    90 

    91     public KerberosClientKeyExchange(ProtocolVersion protocolVersion,

    92             ProtocolVersion clientVersion, SecureRandom rand,

    93             HandshakeInStream input, AccessControlContext acc,

    94             Object serverKeys) throws IOException {

    95 

    96         if (impl != null) {

    97             init(protocolVersion, clientVersion, rand, input, acc, serverKeys);

    98         } else {

    99             throw new IllegalStateException("Kerberos is unavailable");

   100         }

   101     }

   102 

   103     @Override

   104     int messageType() {

   105         return ht_client_key_exchange;

   106     }

   107 

   108     @Override

   109     public int messageLength() {

   110         return impl.messageLength();

   111     }

   112 

   113     @Override

   114     public void send(HandshakeOutStream s) throws IOException {

   115         impl.send(s);

   116     }

   117 

   118     @Override

   119     public void print(PrintStream p) throws IOException {

   120         impl.print(p);

   121     }

   122 

   123     public void init(String serverName,

   124         AccessControlContext acc, ProtocolVersion protocolVersion,

   125         SecureRandom rand) throws IOException {

   126 

   127         if (impl != null) {

   128             impl.init(serverName, acc, protocolVersion, rand);

   129         }

   130     }

   131 

   132     public void init(ProtocolVersion protocolVersion,

   133             ProtocolVersion clientVersion, SecureRandom rand,

   134             HandshakeInStream input, AccessControlContext acc,

   135             Object ServiceCreds) throws IOException {

   136 

   137         if (impl != null) {

   138             impl.init(protocolVersion, clientVersion,

   139                                     rand, input, acc, ServiceCreds);

   140         }

   141     }

   142 

   143     public byte[] getUnencryptedPreMasterSecret() {

   144         return impl.getUnencryptedPreMasterSecret();

   145     }

   146 

   147     public Principal getPeerPrincipal(){

   148         return impl.getPeerPrincipal();

   149     }

   150 

   151     public Principal getLocalPrincipal(){

   152         return impl.getLocalPrincipal();

   153     }

   154 }