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/*
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* Copyright (c) 1996, 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.*;
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import java.nio.ByteBuffer;
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import java.security.SecureRandom;
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import java.util.Arrays;
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/*
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* RandomCookie ... SSL hands standard format random cookies (nonces)
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* around. These know how to encode/decode themselves on SSL streams,
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* and can be created and printed.
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*
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* @author David Brownell
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*/
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final class RandomCookie {
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final byte[] randomBytes = new byte[32]; // exactly 32 bytes
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private static final byte[] hrrRandomBytes = new byte[] {
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(byte)0xCF, (byte)0x21, (byte)0xAD, (byte)0x74,
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(byte)0xE5, (byte)0x9A, (byte)0x61, (byte)0x11,
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(byte)0xBE, (byte)0x1D, (byte)0x8C, (byte)0x02,
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(byte)0x1E, (byte)0x65, (byte)0xB8, (byte)0x91,
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(byte)0xC2, (byte)0xA2, (byte)0x11, (byte)0x16,
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(byte)0x7A, (byte)0xBB, (byte)0x8C, (byte)0x5E,
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(byte)0x07, (byte)0x9E, (byte)0x09, (byte)0xE2,
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(byte)0xC8, (byte)0xA8, (byte)0x33, (byte)0x9C
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};
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private static final byte[] t12Protection = new byte[] {
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(byte)0x44, (byte)0x4F, (byte)0x57, (byte)0x4E,
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(byte)0x47, (byte)0x52, (byte)0x44, (byte)0x01
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};
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private static final byte[] t11Protection = new byte[] {
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(byte)0x44, (byte)0x4F, (byte)0x57, (byte)0x4E,
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(byte)0x47, (byte)0x52, (byte)0x44, (byte)0x00
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};
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static final RandomCookie hrrRandom = new RandomCookie(hrrRandomBytes);
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RandomCookie(SecureRandom generator) {
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generator.nextBytes(randomBytes);
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}
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// Used for server random generation with version downgrade protection.
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RandomCookie(HandshakeContext context) {
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SecureRandom generator = context.sslContext.getSecureRandom();
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generator.nextBytes(randomBytes);
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// TLS 1.3 has a downgrade protection mechanism embedded in the
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// server's random value. TLS 1.3 servers which negotiate TLS 1.2
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// or below in response to a ClientHello MUST set the last eight
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// bytes of their Random value specially.
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byte[] protection = null;
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if (context.maximumActiveProtocol.useTLS13PlusSpec()) {
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if (!context.negotiatedProtocol.useTLS13PlusSpec()) {
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if (context.negotiatedProtocol.useTLS12PlusSpec()) {
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protection = t12Protection;
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} else {
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protection = t11Protection;
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}
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}
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} else if (context.maximumActiveProtocol.useTLS12PlusSpec()) {
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if (!context.negotiatedProtocol.useTLS12PlusSpec()) {
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protection = t11Protection;
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}
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}
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if (protection != null) {
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System.arraycopy(protection, 0, randomBytes,
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randomBytes.length - protection.length, protection.length);
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}
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}
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RandomCookie(ByteBuffer m) throws IOException {
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m.get(randomBytes);
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}
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private RandomCookie(byte[] randomBytes) {
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System.arraycopy(randomBytes, 0, this.randomBytes, 0, 32);
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}
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@Override
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public String toString() {
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return "random_bytes = {" + Utilities.toHexString(randomBytes) + "}";
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}
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boolean isHelloRetryRequest() {
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return Arrays.equals(hrrRandomBytes, randomBytes);
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}
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// Used for client random validation of version downgrade protection.
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boolean isVersionDowngrade(HandshakeContext context) {
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if (context.maximumActiveProtocol.useTLS13PlusSpec()) {
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if (!context.negotiatedProtocol.useTLS13PlusSpec()) {
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return isT12Downgrade() || isT11Downgrade();
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}
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} else if (context.maximumActiveProtocol.useTLS12PlusSpec()) {
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if (!context.negotiatedProtocol.useTLS12PlusSpec()) {
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return isT11Downgrade();
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}
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}
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return false;
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}
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private boolean isT12Downgrade() {
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return Arrays.equals(randomBytes, 24, 32, t12Protection, 0, 8);
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}
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private boolean isT11Downgrade() {
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return Arrays.equals(randomBytes, 24, 32, t11Protection, 0, 8);
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}
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}
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