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/*
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.ssl;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.nio.ByteBuffer;
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import java.security.CryptoPrimitive;
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import java.security.GeneralSecurityException;
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import java.security.KeyFactory;
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import java.text.MessageFormat;
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import java.util.EnumSet;
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import java.util.Locale;
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import javax.crypto.SecretKey;
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import javax.crypto.interfaces.DHPublicKey;
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import javax.crypto.spec.DHParameterSpec;
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import javax.crypto.spec.DHPublicKeySpec;
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import javax.net.ssl.SSLHandshakeException;
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import sun.security.ssl.DHKeyExchange.DHECredentials;
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import sun.security.ssl.DHKeyExchange.DHEPossession;
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import sun.security.ssl.SSLHandshake.HandshakeMessage;
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import sun.security.ssl.SupportedGroupsExtension.NamedGroup;
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import sun.security.util.HexDumpEncoder;
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/**
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* Pack of the "ClientKeyExchange" handshake message.
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*/
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final class DHClientKeyExchange {
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static final DHClientKeyExchangeConsumer dhHandshakeConsumer =
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new DHClientKeyExchangeConsumer();
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static final DHClientKeyExchangeProducer dhHandshakeProducer =
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new DHClientKeyExchangeProducer();
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/**
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* The DiffieHellman ClientKeyExchange handshake message.
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*
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* If the client has sent a certificate which contains a suitable
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* DiffieHellman key (for fixed_dh client authentication), then the
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* client public value is implicit and does not need to be sent again.
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* In this case, the client key exchange message will be sent, but it
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* MUST be empty.
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*
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* Currently, we don't support cipher suite that requires implicit public
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* key of client.
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*/
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private static final
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class DHClientKeyExchangeMessage extends HandshakeMessage {
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private byte[] y; // 1 to 2^16 - 1 bytes
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DHClientKeyExchangeMessage(
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HandshakeContext handshakeContext) throws IOException {
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super(handshakeContext);
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// This happens in client side only.
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ClientHandshakeContext chc =
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(ClientHandshakeContext)handshakeContext;
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DHEPossession dhePossession = null;
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for (SSLPossession possession : chc.handshakePossessions) {
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if (possession instanceof DHEPossession) {
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dhePossession = (DHEPossession)possession;
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break;
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}
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}
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if (dhePossession == null) {
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// unlikely
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chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
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"No DHE credentials negotiated for client key exchange");
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}
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DHPublicKey publicKey = dhePossession.publicKey;
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DHParameterSpec params = publicKey.getParams();
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this.y = Utilities.toByteArray(publicKey.getY());
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}
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DHClientKeyExchangeMessage(HandshakeContext handshakeContext,
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ByteBuffer m) throws IOException {
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super(handshakeContext);
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// This happens in server side only.
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ServerHandshakeContext shc =
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(ServerHandshakeContext)handshakeContext;
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if (m.remaining() < 3) {
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shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
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"Invalid DH ClientKeyExchange message: insufficient data");
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}
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this.y = Record.getBytes16(m);
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if (m.hasRemaining()) {
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shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
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"Invalid DH ClientKeyExchange message: unknown extra data");
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}
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}
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@Override
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public SSLHandshake handshakeType() {
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return SSLHandshake.CLIENT_KEY_EXCHANGE;
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}
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@Override
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public int messageLength() {
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return y.length + 2; // 2: length filed
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}
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@Override
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public void send(HandshakeOutStream hos) throws IOException {
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hos.putBytes16(y);
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}
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@Override
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public String toString() {
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MessageFormat messageFormat = new MessageFormat(
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"\"DH ClientKeyExchange\": '{'\n" +
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" \"parameters\": '{'\n" +
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" \"dh_Yc\": '{'\n" +
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"{0}\n" +
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" '}',\n" +
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" '}'\n" +
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"'}'",
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Locale.ENGLISH);
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HexDumpEncoder hexEncoder = new HexDumpEncoder();
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Object[] messageFields = {
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Utilities.indent(
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hexEncoder.encodeBuffer(y), " "),
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};
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return messageFormat.format(messageFields);
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}
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}
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/**
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* The DiffieHellman "ClientKeyExchange" handshake message producer.
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*/
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private static final
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class DHClientKeyExchangeProducer implements HandshakeProducer {
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// Prevent instantiation of this class.
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private DHClientKeyExchangeProducer() {
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// blank
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}
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@Override
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public byte[] produce(ConnectionContext context,
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HandshakeMessage message) throws IOException {
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// The producing happens in client side only.
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ClientHandshakeContext chc = (ClientHandshakeContext)context;
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DHECredentials dheCredentials = null;
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for (SSLCredentials cd : chc.handshakeCredentials) {
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if (cd instanceof DHECredentials) {
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dheCredentials = (DHECredentials)cd;
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break;
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}
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}
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if (dheCredentials == null) {
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chc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
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"No DHE credentials negotiated for client key exchange");
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}
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DHEPossession dhePossession = new DHEPossession(
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dheCredentials, chc.sslContext.getSecureRandom());
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chc.handshakePossessions.add(dhePossession);
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DHClientKeyExchangeMessage ckem =
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new DHClientKeyExchangeMessage(chc);
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine(
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"Produced DH ClientKeyExchange handshake message", ckem);
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}
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// Output the handshake message.
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ckem.write(chc.handshakeOutput);
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chc.handshakeOutput.flush();
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// update the states
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SSLKeyExchange ke = SSLKeyExchange.valueOf(
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chc.negotiatedCipherSuite.keyExchange,
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chc.negotiatedProtocol);
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if (ke == null) {
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// unlikely
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chc.conContext.fatal(Alert.INTERNAL_ERROR,
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"Not supported key exchange type");
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} else {
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SSLKeyDerivation masterKD = ke.createKeyDerivation(chc);
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SecretKey masterSecret =
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masterKD.deriveKey("MasterSecret", null);
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chc.handshakeSession.setMasterSecret(masterSecret);
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SSLTrafficKeyDerivation kd =
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SSLTrafficKeyDerivation.valueOf(chc.negotiatedProtocol);
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if (kd == null) {
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// unlikely
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chc.conContext.fatal(Alert.INTERNAL_ERROR,
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"Not supported key derivation: " +
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chc.negotiatedProtocol);
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} else {
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chc.handshakeKeyDerivation =
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kd.createKeyDerivation(chc, masterSecret);
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}
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}
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// The handshake message has been delivered.
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return null;
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}
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}
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/**
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* The DiffieHellman "ClientKeyExchange" handshake message consumer.
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*/
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private static final
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class DHClientKeyExchangeConsumer implements SSLConsumer {
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// Prevent instantiation of this class.
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private DHClientKeyExchangeConsumer() {
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// blank
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}
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@Override
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public void consume(ConnectionContext context,
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ByteBuffer message) throws IOException {
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// The consuming happens in server side only.
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ServerHandshakeContext shc = (ServerHandshakeContext)context;
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DHEPossession dhePossession = null;
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for (SSLPossession possession : shc.handshakePossessions) {
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if (possession instanceof DHEPossession) {
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dhePossession = (DHEPossession)possession;
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break;
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}
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}
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if (dhePossession == null) {
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// unlikely
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shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
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"No expected DHE possessions for client key exchange");
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}
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SSLKeyExchange ke = SSLKeyExchange.valueOf(
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shc.negotiatedCipherSuite.keyExchange,
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shc.negotiatedProtocol);
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if (ke == null) {
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// unlikely
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shc.conContext.fatal(Alert.INTERNAL_ERROR,
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"Not supported key exchange type");
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}
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DHClientKeyExchangeMessage ckem =
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new DHClientKeyExchangeMessage(shc, message);
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine(
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"Consuming DH ClientKeyExchange handshake message", ckem);
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}
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// create the credentials
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try {
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DHParameterSpec params = dhePossession.publicKey.getParams();
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DHPublicKeySpec spec = new DHPublicKeySpec(
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new BigInteger(1, ckem.y),
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params.getP(), params.getG());
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KeyFactory kf = JsseJce.getKeyFactory("DiffieHellman");
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DHPublicKey peerPublicKey =
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(DHPublicKey)kf.generatePublic(spec);
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// check constraints of peer DHPublicKey
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if (!shc.algorithmConstraints.permits(
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EnumSet.of(CryptoPrimitive.KEY_AGREEMENT),
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peerPublicKey)) {
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throw new SSLHandshakeException(
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"DHPublicKey does not comply to algorithm constraints");
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}
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NamedGroup namedGroup = NamedGroup.valueOf(params);
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shc.handshakeCredentials.add(
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new DHECredentials(peerPublicKey, namedGroup));
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} catch (GeneralSecurityException | java.io.IOException e) {
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throw (SSLHandshakeException)(new SSLHandshakeException(
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"Could not generate DHPublicKey").initCause(e));
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}
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// update the states
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SSLKeyDerivation masterKD = ke.createKeyDerivation(shc);
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SecretKey masterSecret =
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masterKD.deriveKey("MasterSecret", null);
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shc.handshakeSession.setMasterSecret(masterSecret);
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SSLTrafficKeyDerivation kd =
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SSLTrafficKeyDerivation.valueOf(shc.negotiatedProtocol);
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if (kd == null) {
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// unlikely
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shc.conContext.fatal(Alert.INTERNAL_ERROR,
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"Not supported key derivation: " + shc.negotiatedProtocol);
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} else {
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shc.handshakeKeyDerivation =
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kd.createKeyDerivation(shc, masterSecret);
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}
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}
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}
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}
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