1 /*
   2  * Copyright (c) 2006, 2012, 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 



  30 import javax.net.ssl.SSLProtocolException;






  31 
  32 /*
  33  * For secure renegotiation, RFC5746 defines a new TLS extension,
  34  * "renegotiation_info" (with extension type 0xff01), which contains a
  35  * cryptographic binding to the enclosing TLS connection (if any) for
  36  * which the renegotiation is being performed.  The "extension data"
  37  * field of this extension contains a "RenegotiationInfo" structure:
  38  *
  39  *      struct {
  40  *          opaque renegotiated_connection<0..255>;
  41  *      } RenegotiationInfo;
  42  */
  43 final class RenegotiationInfoExtension extends HelloExtension {
  44     private final byte[] renegotiated_connection;












  45 
  46     RenegotiationInfoExtension(byte[] clientVerifyData,
  47                 byte[] serverVerifyData) {
  48         super(ExtensionType.EXT_RENEGOTIATION_INFO);
  49 
  50         if (clientVerifyData.length != 0) {
  51             renegotiated_connection =
  52                     new byte[clientVerifyData.length + serverVerifyData.length];
  53             System.arraycopy(clientVerifyData, 0, renegotiated_connection,
  54                     0, clientVerifyData.length);
  55 
  56             if (serverVerifyData.length != 0) {
  57                 System.arraycopy(serverVerifyData, 0, renegotiated_connection,
  58                         clientVerifyData.length, serverVerifyData.length);












  59             }












  60         } else {
  61             // ignore both the client and server verify data.
  62             renegotiated_connection = new byte[0];
















  63         }
  64     }
  65 
  66     RenegotiationInfoExtension(HandshakeInStream s, int len)
  67                 throws IOException {
  68         super(ExtensionType.EXT_RENEGOTIATION_INFO);







  69 
  70         // check the extension length
  71         if (len < 1) {
  72             throw new SSLProtocolException("Invalid " + type + " extension");



















































  73         }
  74 
  75         int renegoInfoDataLen = s.getInt8();
  76         if (renegoInfoDataLen + 1 != len) {  // + 1 = the byte we just read
  77             throw new SSLProtocolException("Invalid " + type + " extension");



  78         }
  79 
  80         renegotiated_connection = new byte[renegoInfoDataLen];
  81         if (renegoInfoDataLen != 0) {
  82             s.read(renegotiated_connection, 0, renegoInfoDataLen);
  83         }
  84     }
  85 










  86 
  87     // Length of the encoded extension, including the type and length fields
  88     @Override
  89     int length() {
  90         return 5 + renegotiated_connection.length;

























































  91     }
  92 






  93     @Override
  94     void send(HandshakeOutStream s) throws IOException {
  95         s.putInt16(type.id);
  96         s.putInt16(renegotiated_connection.length + 1);
  97         s.putBytes8(renegotiated_connection);














  98     }
  99 
 100     boolean isEmpty() {
 101         return renegotiated_connection.length == 0;





























 102     }
 103 
 104     byte[] getRenegotiatedConnection() {
 105         return renegotiated_connection;







 106     }
 107 
 108     @Override
 109     public String toString() {
 110         return "Extension " + type + ", renegotiated_connection: " +
 111                     (renegotiated_connection.length == 0 ? "<empty>" :
 112                     Debug.toString(renegotiated_connection));








































































 113     }
 114 










































































































































 115 }

   1 /*
   2  * Copyright (c) 2015, 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 
  26 package sun.security.ssl;
  27 
  28 import java.io.IOException;
  29 import java.nio.ByteBuffer;
  30 import java.text.MessageFormat;
  31 import java.util.Arrays;
  32 import java.util.Locale;
  33 import javax.net.ssl.SSLProtocolException;
  34 import sun.security.ssl.ClientHello.ClientHelloMessage;
  35 import static sun.security.ssl.SSLExtension.CH_RENEGOTIATION_INFO;
  36 import sun.security.ssl.SSLExtension.ExtensionConsumer;
  37 import static sun.security.ssl.SSLExtension.SH_RENEGOTIATION_INFO;
  38 import sun.security.ssl.SSLExtension.SSLExtensionSpec;
  39 import sun.security.ssl.SSLHandshake.HandshakeMessage;
  40 
  41 /**
  42  * Pack of the "renegotiation_info" extensions [RFC 5746].








  43  */
  44 final class RenegoInfoExtension {
  45     static final HandshakeProducer chNetworkProducer =
  46             new CHRenegotiationInfoProducer();
  47     static final ExtensionConsumer chOnLoadConcumer =
  48             new CHRenegotiationInfoConsumer();
  49     static final HandshakeAbsence chOnLoadAbsence =
  50             new CHRenegotiationInfoAbsence();
  51 
  52     static final HandshakeProducer shNetworkProducer =
  53             new SHRenegotiationInfoProducer();
  54     static final ExtensionConsumer shOnLoadConcumer =
  55             new SHRenegotiationInfoConsumer();
  56     static final HandshakeAbsence shOnLoadAbsence =
  57             new SHRenegotiationInfoAbsence();
  58 
  59     static final SSLStringize rniStringize =
  60             new RenegotiationInfoStringize();

  61 
  62     /**
  63      * The "renegotiation_info" extension.
  64      */
  65     static final class RenegotiationInfoSpec implements SSLExtensionSpec {
  66         // A nominal object that does not holding any real renegotiation info.
  67         static final RenegotiationInfoSpec NOMINAL =
  68                 new RenegotiationInfoSpec(new byte[0]);
  69 
  70         private final byte[] renegotiatedConnection;
  71 
  72         private RenegotiationInfoSpec(byte[] renegotiatedConnection) {
  73             this.renegotiatedConnection = Arrays.copyOf(
  74                     renegotiatedConnection, renegotiatedConnection.length);
  75         }
  76 
  77         private RenegotiationInfoSpec(ByteBuffer m) throws IOException {
  78             // Parse the extension.
  79             if (!m.hasRemaining() || m.remaining() < 1) {
  80                 throw new SSLProtocolException(
  81                     "Invalid renegotiation_info extension data: " +
  82                     "insufficient data");
  83             }
  84             this.renegotiatedConnection = Record.getBytes8(m);
  85         }
  86 
  87         @Override
  88         public String toString() {
  89             MessageFormat messageFormat = new MessageFormat(
  90                 "\"renegotiated connection\": '['{0}']'", Locale.ENGLISH);
  91             if (renegotiatedConnection.length == 0) {
  92                 Object[] messageFields = {
  93                         "<no renegotiated connection>"
  94                     };
  95                 return messageFormat.format(messageFields);
  96             } else {
  97                 Object[] messageFields = {
  98                         Utilities.toHexString(renegotiatedConnection)
  99                     };
 100                 return messageFormat.format(messageFields);
 101             }
 102         }
 103     }
 104 
 105     private static final
 106             class RenegotiationInfoStringize implements SSLStringize {
 107         @Override
 108         public String toString(ByteBuffer buffer) {
 109             try {
 110                 return (new RenegotiationInfoSpec(buffer)).toString();
 111             } catch (IOException ioe) {
 112                 // For debug logging only, so please swallow exceptions.
 113                 return ioe.getMessage();
 114             }
 115         }
 116     }
 117 
 118     /**
 119      * Network data producer of a "renegotiation_info" extension in
 120      * the ClientHello handshake message.
 121      */
 122     private static final
 123             class CHRenegotiationInfoProducer implements HandshakeProducer {
 124         // Prevent instantiation of this class.
 125         private CHRenegotiationInfoProducer() {
 126             // blank
 127         }
 128 
 129         @Override
 130         public byte[] produce(ConnectionContext context,
 131                 HandshakeMessage message) throws IOException {
 132             // The producing happens in client side only.
 133             ClientHandshakeContext chc = (ClientHandshakeContext)context;
 134 
 135             // Is it a supported and enabled extension?
 136             if (!chc.sslConfig.isAvailable(CH_RENEGOTIATION_INFO)) {
 137                 if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 138                     SSLLogger.fine(
 139                             "Ignore unavailable renegotiation_info extension");
 140                 }
 141 
 142                 return null;
 143             }
 144 
 145             if (!chc.conContext.isNegotiated) {
 146                 if (chc.activeCipherSuites.contains(
 147                         CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV)) {
 148                     // Using the the TLS_EMPTY_RENEGOTIATION_INFO_SCSV instead.
 149                     return null;
 150                 }
 151 
 152                 // initial handshaking.
 153                 //
 154                 // If this is the initial handshake for a connection, then the
 155                 // "renegotiated_connection" field is of zero length in both
 156                 // the ClientHello and the ServerHello. [RFC 5746]
 157                 byte[] extData = new byte[] { 0x00 };
 158                 chc.handshakeExtensions.put(
 159                         CH_RENEGOTIATION_INFO, RenegotiationInfoSpec.NOMINAL);
 160 
 161                 return extData;
 162             } else if (chc.conContext.secureRenegotiation) {
 163                 // secure renegotiation
 164                 //
 165                 // For ClientHello handshake message in renegotiation, this
 166                 // field contains the "client_verify_data".
 167                 byte[] extData =
 168                         new byte[chc.conContext.clientVerifyData.length + 1];
 169                 ByteBuffer m = ByteBuffer.wrap(extData);
 170                 Record.putBytes8(m, chc.conContext.clientVerifyData);
 171 
 172                 // The conContext.clientVerifyData will be used for further
 173                 // processing, so it does not matter to save whatever in the
 174                 // RenegotiationInfoSpec object.
 175                 chc.handshakeExtensions.put(
 176                         CH_RENEGOTIATION_INFO, RenegotiationInfoSpec.NOMINAL);
 177 
 178                 return extData;
 179             } else {    // not secure renegotiation
 180                 if (HandshakeContext.allowUnsafeRenegotiation) {
 181                     if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 182                         SSLLogger.warning("Using insecure renegotiation");
 183                     }
 184 
 185                     return null;
 186                 } else {
 187                     // terminate the session.
 188                     chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 189                             "insecure renegotiation is not allowed");
 190                 }
 191             }
 192 
 193             return null;


 194         }
 195     }
 196 
 197     /**
 198      * Network data producer of a "renegotiation_info" extension in
 199      * the ServerHello handshake message.
 200      */
 201     private static final
 202             class CHRenegotiationInfoConsumer implements ExtensionConsumer {
 203         // Prevent instantiation of this class.
 204         private CHRenegotiationInfoConsumer() {
 205             // blank
 206         }
 207 

 208         @Override
 209         public void consume(ConnectionContext context,
 210             HandshakeMessage message, ByteBuffer buffer) throws IOException {
 211 
 212             // The comsuming happens in server side only.
 213             ServerHandshakeContext shc = (ServerHandshakeContext)context;
 214 
 215             // Is it a supported and enabled extension?
 216             if (!shc.sslConfig.isAvailable(CH_RENEGOTIATION_INFO)) {
 217                 if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 218                     SSLLogger.fine("Ignore unavailable extension: " +
 219                             CH_RENEGOTIATION_INFO.name);
 220                 }
 221                 return;     // ignore the extension
 222             }
 223 
 224             // Parse the extension.
 225             RenegotiationInfoSpec spec;
 226             try {
 227                 spec = new RenegotiationInfoSpec(buffer);
 228             } catch (IOException ioe) {
 229                 shc.conContext.fatal(Alert.UNEXPECTED_MESSAGE, ioe);
 230                 return;     // fatal() always throws, make the compiler happy.
 231             }
 232 
 233             if (!shc.conContext.isNegotiated) {
 234                 // initial handshaking.
 235                 if (spec.renegotiatedConnection.length != 0) {
 236                     shc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
 237                         "Invalid renegotiation_info extension data: not empty");
 238                 }
 239                 shc.conContext.secureRenegotiation = true;
 240             } else {
 241                 if (!shc.conContext.secureRenegotiation) {
 242                     // Unexpected RI extension for insecure renegotiation,
 243                     // abort the handshake with a fatal handshake_failure alert.
 244                     shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 245                             "The renegotiation_info is present in a insecure " +
 246                             "renegotiation");
 247                 } else {
 248                     // verify the client_verify_data value
 249                     if (!Arrays.equals(shc.conContext.clientVerifyData,
 250                             spec.renegotiatedConnection)) {
 251                         shc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
 252                             "Invalid renegotiation_info extension data: " +
 253                             "incorrect verify data in ClientHello");
 254                     }
 255                 }
 256             }
 257 
 258             // Update the context.
 259             //
 260             // The conContext.clientVerifyData will be used for further
 261             // processing, so it does not matter to save whatever in the
 262             // RenegotiationInfoSpec object.
 263             shc.handshakeExtensions.put(
 264                     CH_RENEGOTIATION_INFO, RenegotiationInfoSpec.NOMINAL);
 265 
 266             // No impact on session resumption.
 267         }
 268     }
 269 
 270     /**
 271      * The absence processing if a "renegotiation_info" extension is
 272      * not present in the ClientHello handshake message.
 273      */
 274     private static final
 275             class CHRenegotiationInfoAbsence implements HandshakeAbsence {
 276         @Override
 277         public void absent(ConnectionContext context,
 278                 HandshakeMessage message) throws IOException {
 279             // The producing happens in server side only.
 280             ServerHandshakeContext shc = (ServerHandshakeContext)context;
 281             ClientHelloMessage clientHello = (ClientHelloMessage)message;
 282 
 283             if (!shc.conContext.isNegotiated) {
 284                 // initial handshaking.
 285                 for (int id : clientHello.cipherSuiteIds) {
 286                     if (id ==
 287                             CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV.id) {
 288                         if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 289                             SSLLogger.finest(
 290                                 "Safe renegotiation, using the SCSV signgling");
 291                         }
 292                         shc.conContext.secureRenegotiation = true;
 293                         return;
 294                     }
 295                 }
 296 
 297                 if (!HandshakeContext.allowLegacyHelloMessages) {
 298                     shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 299                         "Failed to negotiate the use of secure renegotiation");
 300                 }   // otherwise, allow legacy hello message
 301 
 302                 if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 303                     SSLLogger.warning("Warning: No renegotiation " +
 304                         "indication in ClientHello, allow legacy ClientHello");
 305                 }
 306 
 307                 shc.conContext.secureRenegotiation = false;
 308             } else if (shc.conContext.secureRenegotiation) {
 309                 // Require secure renegotiation, terminate the connection.
 310                 shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 311                         "Inconsistent secure renegotiation indication");
 312             } else {    // renegotiation, not secure
 313                 if (HandshakeContext.allowUnsafeRenegotiation) {
 314                     if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 315                         SSLLogger.warning("Using insecure renegotiation");
 316                     }
 317                 } else {
 318                     // Unsafe renegotiation should have been aborted in
 319                     // ealier processes.
 320                     if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 321                         SSLLogger.fine("Terminate insecure renegotiation");
 322                     }
 323                     shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 324                         "Unsafe renegotiation is not allowed");
 325                 }
 326             }
 327         }
 328     }
 329 
 330     /**
 331      * Network data producer of a "renegotiation_info" extension in
 332      * the ServerHello handshake message.
 333      */
 334     private static final
 335             class SHRenegotiationInfoProducer implements HandshakeProducer {
 336         // Prevent instantiation of this class.
 337         private SHRenegotiationInfoProducer() {
 338             // blank
 339         }
 340 
 341         @Override
 342         public byte[] produce(ConnectionContext context,
 343                 HandshakeMessage message) throws IOException {
 344             // The producing happens in server side only.
 345             ServerHandshakeContext shc = (ServerHandshakeContext)context;
 346 
 347             // In response to "renegotiation_info" extension request only.
 348             RenegotiationInfoSpec requestedSpec = (RenegotiationInfoSpec)
 349                     shc.handshakeExtensions.get(CH_RENEGOTIATION_INFO);
 350             if (requestedSpec == null && !shc.conContext.secureRenegotiation) {
 351                 // Ignore, no renegotiation_info extension or SCSV signgling
 352                 // requested.
 353                 if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 354                     SSLLogger.finest(
 355                         "Ignore unavailable renegotiation_info extension");
 356                 }
 357                 return null;        // ignore the extension
 358             }
 359 
 360             if (!shc.conContext.secureRenegotiation) {
 361                 // Ignore, no secure renegotiation is negotiated.
 362                 if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 363                     SSLLogger.finest(
 364                         "No secure renegotiation has been negotiated");
 365                 }
 366                 return null;        // ignore the extension
 367             }
 368 
 369             if (!shc.conContext.isNegotiated) {
 370                 // initial handshaking.
 371                 //
 372                 // If this is the initial handshake for a connection, then the
 373                 // "renegotiated_connection" field is of zero length in both
 374                 // the ClientHello and the ServerHello. [RFC 5746]
 375                 byte[] extData = new byte[] { 0x00 };
 376 
 377                 // The conContext.client/serverVerifyData will be used for
 378                 // further processing, so it does not matter to save whatever
 379                 // in the RenegotiationInfoSpec object.
 380                 shc.handshakeExtensions.put(
 381                         SH_RENEGOTIATION_INFO, RenegotiationInfoSpec.NOMINAL);
 382 
 383                 return extData;
 384             } else {
 385                 // secure renegotiation
 386                 //
 387                 // For secure renegotiation, the server MUST include a
 388                 // "renegotiation_info" extension containing the saved
 389                 // client_verify_data and server_verify_data in the ServerHello.
 390                 int infoLen = shc.conContext.clientVerifyData.length +
 391                               shc.conContext.serverVerifyData.length;
 392                 byte[] extData = new byte[infoLen + 1];
 393                 ByteBuffer m = ByteBuffer.wrap(extData);
 394                 Record.putInt8(m, infoLen);
 395                 m.put(shc.conContext.clientVerifyData);
 396                 m.put(shc.conContext.serverVerifyData);
 397 
 398                 // The conContext.client/serverVerifyData will be used for
 399                 // further processing, so it does not matter to save whatever
 400                 // in the RenegotiationInfoSpec object.
 401                 shc.handshakeExtensions.put(
 402                         SH_RENEGOTIATION_INFO, RenegotiationInfoSpec.NOMINAL);
 403 
 404                 return extData;
 405             }
 406         }
 407     }
 408 
 409     /**
 410      * Network data consumer of a "renegotiation_info" extension in
 411      * the ServerHello handshake message.
 412      */
 413     private static final
 414             class SHRenegotiationInfoConsumer implements ExtensionConsumer {
 415         // Prevent instantiation of this class.
 416         private SHRenegotiationInfoConsumer() {
 417             // blank
 418         }
 419 
 420         @Override
 421         public void consume(ConnectionContext context,
 422             HandshakeMessage message, ByteBuffer buffer) throws IOException {
 423             // The producing happens in client side only.
 424             ClientHandshakeContext chc = (ClientHandshakeContext)context;
 425 
 426             // In response to the client renegotiation_info extension request
 427             // or SCSV signling, which is mandatory for ClientHello message.
 428             RenegotiationInfoSpec requestedSpec = (RenegotiationInfoSpec)
 429                     chc.handshakeExtensions.get(CH_RENEGOTIATION_INFO);
 430             if (requestedSpec == null &&
 431                     !chc.activeCipherSuites.contains(
 432                             CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV)) {
 433                 chc.conContext.fatal(Alert.INTERNAL_ERROR,
 434                     "Missing renegotiation_info and SCSV detected in " +
 435                     "ClientHello");
 436             }
 437 
 438             // Parse the extension.
 439             RenegotiationInfoSpec spec;
 440             try {
 441                 spec = new RenegotiationInfoSpec(buffer);
 442             } catch (IOException ioe) {
 443                 chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE, ioe);
 444                 return;     // fatal() always throws, make the compiler happy.
 445             }
 446 
 447 
 448             if (!chc.conContext.isNegotiated) {     // initial handshake
 449                 // If the extension is present, set the secure_renegotiation
 450                 // flag to TRUE.  The client MUST then verify that the
 451                 // length of the "renegotiated_connection" field is zero,
 452                 // and if it is not, MUST abort the handshake (by sending
 453                 // a fatal handshake_failure alert). [RFC 5746]
 454                 if (spec.renegotiatedConnection.length != 0) {
 455                     chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 456                         "Invalid renegotiation_info in ServerHello: " +
 457                         "not empty renegotiated_connection");
 458                 }
 459 
 460                 chc.conContext.secureRenegotiation = true;
 461             } else {        // renegotiation
 462                 // The client MUST then verify that the first half of the
 463                 // "renegotiated_connection" field is equal to the saved
 464                 // client_verify_data value, and the second half is equal to the
 465                 // saved server_verify_data value.  If they are not, the client
 466                 // MUST abort the handshake. [RFC 5746]
 467                 int infoLen = chc.conContext.clientVerifyData.length +
 468                               chc.conContext.serverVerifyData.length;
 469                 if (spec.renegotiatedConnection.length != infoLen) {
 470                     chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 471                         "Invalid renegotiation_info in ServerHello: " +
 472                         "invalid renegotiated_connection length (" +
 473                         spec.renegotiatedConnection.length + ")");
 474                 }
 475 
 476                 byte[] cvd = chc.conContext.clientVerifyData;
 477                 if (!Arrays.equals(spec.renegotiatedConnection,
 478                         0, cvd.length, cvd, 0, cvd.length)) {
 479                     chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 480                         "Invalid renegotiation_info in ServerHello: " +
 481                         "unmatched client_verify_data value");
 482                 }
 483                 byte[] svd = chc.conContext.serverVerifyData;
 484                 if (!Arrays.equals(spec.renegotiatedConnection,
 485                         cvd.length, infoLen, svd, 0, svd.length)) {
 486                     chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 487                         "Invalid renegotiation_info in ServerHello: " +
 488                         "unmatched server_verify_data value");
 489                 }
 490             }
 491 
 492             // Update the context.
 493             chc.handshakeExtensions.put(
 494                     SH_RENEGOTIATION_INFO, RenegotiationInfoSpec.NOMINAL);
 495 
 496             // No impact on session resumption.
 497         }
 498     }
 499 
 500     /**
 501      * The absence processing if a "renegotiation_info" extension is
 502      * not present in the ServerHello handshake message.
 503      */
 504     private static final
 505             class SHRenegotiationInfoAbsence implements HandshakeAbsence {
 506         @Override
 507         public void absent(ConnectionContext context,
 508                 HandshakeMessage message) throws IOException {
 509             // The producing happens in client side only.
 510             ClientHandshakeContext chc = (ClientHandshakeContext)context;
 511 
 512             // In response to the client renegotiation_info extension request
 513             // or SCSV signling, which is mandatory for ClientHello message.
 514             RenegotiationInfoSpec requestedSpec = (RenegotiationInfoSpec)
 515                     chc.handshakeExtensions.get(CH_RENEGOTIATION_INFO);
 516             if (requestedSpec == null &&
 517                     !chc.activeCipherSuites.contains(
 518                             CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV)) {
 519                 chc.conContext.fatal(Alert.INTERNAL_ERROR,
 520                     "Missing renegotiation_info and SCSV detected in " +
 521                     "ClientHello");
 522             }
 523 
 524             if (!chc.conContext.isNegotiated) {
 525                 // initial handshaking.
 526                 if (!HandshakeContext.allowLegacyHelloMessages) {
 527                     chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 528                         "Failed to negotiate the use of secure renegotiation");
 529                 }   // otherwise, allow legacy hello message
 530 
 531                 if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 532                     SSLLogger.warning("Warning: No renegotiation " +
 533                         "indication in ServerHello, allow legacy ServerHello");
 534                 }
 535 
 536                 chc.conContext.secureRenegotiation = false;
 537             } else if (chc.conContext.secureRenegotiation) {
 538                 // Require secure renegotiation, terminate the connection.
 539                 chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 540                         "Inconsistent secure renegotiation indication");
 541             } else {    // renegotiation, not secure
 542                 if (HandshakeContext.allowUnsafeRenegotiation) {
 543                     if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 544                         SSLLogger.warning("Using insecure renegotiation");
 545                     }
 546                 } else {
 547                     // Unsafe renegotiation should have been aborted in
 548                     // ealier processes.
 549                     if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
 550                         SSLLogger.fine("Terminate insecure renegotiation");
 551                     }
 552                     chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
 553                         "Unsafe renegotiation is not allowed");
 554                 }
 555             }
 556         }
 557     }
 558 }