1 /*

     2  * Copyright (c) 2018, 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 package sun.security.ssl;

    26 

    27 import java.io.IOException;

    28 import java.nio.ByteBuffer;

    29 import java.text.MessageFormat;

    30 import java.util.*;

    31 import sun.security.ssl.SSLExtension.ExtensionConsumer;

    32 

    33 import sun.security.ssl.SSLExtension.SSLExtensionSpec;

    34 import sun.security.ssl.SSLHandshake.HandshakeMessage;

    35 

    36 /**

    37  * Pack of the "psk_key_exchange_modes" extensions.

    38  */

    39 final class PskKeyExchangeModesExtension {

    40     static final HandshakeProducer chNetworkProducer =

    41             new PskKeyExchangeModesProducer();

    42     static final ExtensionConsumer chOnLoadConsumer =

    43             new PskKeyExchangeModesConsumer();

    44 

    45     enum PskKeyExchangeMode {

    46         PSK_KE(0),

    47         PSK_DHE_KE(1);

    48 

    49         private final int v;

    50 

    51         PskKeyExchangeMode(int v) {

    52             this.v = v;

    53         }

    54 

    55         static PskKeyExchangeMode ofInt(int v) {

    56             for(PskKeyExchangeMode mode : values()) {

    57                 if (mode.v == v) {

    58                     return mode;

    59                 }

    60             }

    61 

    62             return null;

    63         }

    64     }

    65 

    66     static final class PskKeyExchangeModesSpec implements SSLExtensionSpec {

    67 

    68 

    69         final List<PskKeyExchangeMode> modes;

    70 

    71         PskKeyExchangeModesSpec(List<PskKeyExchangeMode> modes) {

    72             this.modes = modes;

    73         }

    74 

    75         PskKeyExchangeModesSpec(ByteBuffer m) throws IOException {

    76 

    77             modes = new ArrayList<>();

    78             int modesEncodedLength = Record.getInt8(m);

    79             int modesReadLength = 0;

    80             while (modesReadLength < modesEncodedLength) {

    81                 int mode = Record.getInt8(m);

    82                 // TODO: handle incorrect values

    83                 modes.add(PskKeyExchangeMode.ofInt(mode));

    84                 modesReadLength += 1;

    85             }

    86         }

    87 

    88         byte[] getEncoded() throws IOException {

    89 

    90             int encodedLength = modes.size() + 1;

    91             byte[] buffer = new byte[encodedLength];

    92             ByteBuffer m = ByteBuffer.wrap(buffer);

    93             Record.putInt8(m, modes.size());

    94             for(PskKeyExchangeMode curMode : modes) {

    95                 Record.putInt8(m, curMode.v);

    96             }

    97 

    98             return buffer;

    99         }

   100 

   101         @Override

   102         public String toString() {

   103             MessageFormat messageFormat = new MessageFormat(

   104             "\"PskKeyExchangeModes\": '{'\n" +

   105             "  \"ke_modes\"      : \"{0}\",\n" +

   106             "'}'",

   107             Locale.ENGLISH);

   108 

   109             Object[] messageFields = {

   110             Utilities.indent(modesString()),

   111             };

   112 

   113             return messageFormat.format(messageFields);

   114         }

   115 

   116         String modesString() {

   117             StringBuilder result = new StringBuilder();

   118             for(PskKeyExchangeMode curMode : modes) {

   119                 result.append(curMode.toString() + "\n");

   120             }

   121 

   122             return result.toString();

   123         }

   124     }

   125 

   126 

   127     private static final

   128             class PskKeyExchangeModesConsumer implements ExtensionConsumer {

   129         // Prevent instantiation of this class.

   130         private PskKeyExchangeModesConsumer() {

   131             // blank

   132         }

   133 

   134         @Override

   135         public void consume(ConnectionContext context,

   136             HandshakeMessage message, ByteBuffer buffer) throws IOException {

   137 

   138             ServerHandshakeContext shc =

   139                     (ServerHandshakeContext) message.handshakeContext;

   140 

   141             PskKeyExchangeModesSpec modes = new PskKeyExchangeModesSpec(buffer);

   142             if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

   143                 SSLLogger.fine(

   144                 "Received PskKeyExchangeModes extension: ", modes);

   145             }

   146 

   147             shc.pskKeyExchangeModes = modes.modes;

   148         }

   149 

   150     }

   151 

   152     private static final

   153             class PskKeyExchangeModesProducer implements HandshakeProducer {

   154 

   155         static final List<PskKeyExchangeMode> MODES =

   156             List.of(PskKeyExchangeMode.PSK_DHE_KE);

   157         static final PskKeyExchangeModesSpec MODES_MSG =

   158             new PskKeyExchangeModesSpec(MODES);

   159 

   160         // Prevent instantiation of this class.

   161         private PskKeyExchangeModesProducer() {

   162             // blank

   163         }

   164 

   165         @Override

   166         public byte[] produce(ConnectionContext context,

   167                 HandshakeMessage message) throws IOException {

   168 

   169             return MODES_MSG.getEncoded();

   170         }

   171 

   172     }

   173 }

   174