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/*
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* Copyright (c) 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.nio.ByteBuffer;
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import java.text.MessageFormat;
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import java.util.*;
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import sun.security.ssl.SSLHandshake.HandshakeMessage;
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import sun.security.util.HexDumpEncoder;
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/**
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* SSL/(D)TLS extensions in a handshake message.
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*/
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final class SSLExtensions {
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private final HandshakeMessage handshakeMessage;
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private Map<SSLExtension, byte[]> extMap = new LinkedHashMap<>();
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2
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private int encodedLength;
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// Extension map for debug logging
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private final Map<Integer, byte[]> logMap =
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SSLLogger.isOn ? null : new LinkedHashMap<>();
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SSLExtensions(HandshakeMessage handshakeMessage) {
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this.handshakeMessage = handshakeMessage;
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this.encodedLength = 2; // 2: the length of the extensions.
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}
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SSLExtensions(HandshakeMessage hm,
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ByteBuffer m, SSLExtension[] extensions) throws IOException {
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this.handshakeMessage = hm;
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int len = Record.getInt16(m);
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encodedLength = len + 2; // 2: the length of the extensions.
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while (len > 0) {
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int extId = Record.getInt16(m);
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int extLen = Record.getInt16(m);
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if (extLen > m.remaining()) {
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hm.handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
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"Error parsing extension (" + extId +
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"): no sufficient data");
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}
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SSLHandshake handshakeType = hm.handshakeType();
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if (SSLExtension.isConsumable(extId) &&
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SSLExtension.valueOf(handshakeType, extId) == null) {
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hm.handshakeContext.conContext.fatal(
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Alert.UNSUPPORTED_EXTENSION,
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"extension (" + extId +
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") should not be presented in " + handshakeType.name);
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}
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boolean isSupported = false;
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for (SSLExtension extension : extensions) {
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if ((extension.id != extId) ||
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(extension.onLoadConcumer == null)) {
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continue;
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}
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if (extension.handshakeType != handshakeType) {
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hm.handshakeContext.conContext.fatal(
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Alert.UNSUPPORTED_EXTENSION,
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"extension (" + extId + ") should not be " +
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"presented in " + handshakeType.name);
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}
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byte[] extData = new byte[extLen];
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m.get(extData);
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extMap.put(extension, extData);
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if (logMap != null) {
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logMap.put(extId, extData);
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}
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isSupported = true;
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break;
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}
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if (!isSupported) {
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if (logMap != null) {
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// cache the extension for debug logging
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byte[] extData = new byte[extLen];
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m.get(extData);
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logMap.put(extId, extData);
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine(
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"Ignore unknown or unsupported extension",
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toString(extId, extData));
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}
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} else {
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// ignore the extension
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int pos = m.position() + extLen;
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m.position(pos);
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}
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}
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len -= extLen + 4;
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}
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}
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byte[] get(SSLExtension ext) {
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return extMap.get(ext);
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}
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/**
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* Consume the specified extensions.
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*/
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void consumeOnLoad(HandshakeContext context,
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SSLExtension[] extensions) throws IOException {
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for (SSLExtension extension : extensions) {
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if (context.negotiatedProtocol != null &&
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!extension.isAvailable(context.negotiatedProtocol)) {
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine(
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"Ignore unsupported extension: " + extension.name);
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}
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continue;
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// context.conContext.fatal(Alert.UNSUPPORTED_EXTENSION,
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// context.negotiatedProtocol + " does not support " +
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// extension + " extension");
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}
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if (!extMap.containsKey(extension)) {
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if (extension.onLoadAbsence != null) {
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extension.absent(context, handshakeMessage);
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} else if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine(
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"Ignore unavailable extension: " + extension.name);
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}
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continue;
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}
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if (extension.onLoadConcumer == null) {
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.warning(
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"Ignore unsupported extension: " + extension.name);
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}
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continue;
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}
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ByteBuffer m = ByteBuffer.wrap(extMap.get(extension));
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extension.consumeOnLoad(context, handshakeMessage, m);
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine("Consumed extension: " + extension.name);
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}
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}
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}
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/**
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* Consider impact of the specified extensions.
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*/
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void consumeOnTrade(HandshakeContext context,
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SSLExtension[] extensions) throws IOException {
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for (SSLExtension extension : extensions) {
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if (!extMap.containsKey(extension)) {
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// No impact could be expected, so just ignore the absence.
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continue;
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}
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if (extension.onTradeConsumer == null) {
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.warning(
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"Ignore impact of unsupported extension: " +
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extension.name);
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}
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continue;
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}
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extension.consumeOnTrade(context, handshakeMessage);
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine("Populated with extension: " + extension.name);
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}
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}
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}
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/**
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* Produce extension values for the specified extensions.
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*/
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void produce(HandshakeContext context,
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SSLExtension[] extensions) throws IOException {
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for (SSLExtension extension : extensions) {
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if (extMap.containsKey(extension)) {
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.fine(
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"Ignore, duplicated extension: " +
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extension.name);
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}
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continue;
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}
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if (extension.networkProducer == null) {
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.warning(
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"Ignore, no extension producer defined: " +
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extension.name);
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}
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continue;
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}
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byte[] encoded = extension.produce(context, handshakeMessage);
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if (encoded != null) {
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extMap.put(extension, encoded);
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encodedLength += encoded.length + 4; // extension_type (2)
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// extension_data length(2)
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} else if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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// The extension is not available in the context.
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SSLLogger.fine(
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"Ignore, context unavailable extension: " +
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extension.name);
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}
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}
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}
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/**
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* Produce extension values for the specified extensions, replacing if
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* there is an existing extension value for a specified extension.
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*/
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void reproduce(HandshakeContext context,
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SSLExtension[] extensions) throws IOException {
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for (SSLExtension extension : extensions) {
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if (extension.networkProducer == null) {
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if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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SSLLogger.warning(
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"Ignore, no extension producer defined: " +
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extension.name);
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}
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continue;
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}
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byte[] encoded = extension.produce(context, handshakeMessage);
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if (encoded != null) {
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if (extMap.containsKey(extension)) {
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byte[] old = extMap.replace(extension, encoded);
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if (old != null) {
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encodedLength -= old.length + 4;
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}
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encodedLength += encoded.length + 4;
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} else {
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extMap.put(extension, encoded);
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encodedLength += encoded.length + 4;
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// extension_type (2)
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// extension_data length(2)
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}
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} else if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
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// The extension is not available in the context.
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SSLLogger.fine(
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"Ignore, context unavailable extension: " +
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extension.name);
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}
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}
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}
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// Note that TLS 1.3 may use empty extensions. Please consider it while
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// using this method.
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int length() {
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if (extMap.isEmpty()) {
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return 0;
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} else {
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return encodedLength;
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2
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}
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}
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56542
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// Note that TLS 1.3 may use empty extensions. Please consider it while
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// using this method.
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void send(HandshakeOutStream hos) throws IOException {
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int extsLen = length();
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if (extsLen == 0) {
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return;
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}
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hos.putInt16(extsLen - 2);
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// extensions must be sent in the order they appear in the enum
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for (SSLExtension ext : SSLExtension.values()) {
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299 |
byte[] extData = extMap.get(ext);
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if (extData != null) {
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hos.putInt16(ext.id);
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hos.putBytes16(extData);
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}
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304 |
}
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}
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307 |
@Override
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308 |
public String toString() {
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309 |
if (extMap.isEmpty() && (logMap == null || logMap.isEmpty())) {
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return "<no extension>";
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311 |
} else {
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312 |
StringBuilder builder = new StringBuilder(512);
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313 |
if (logMap != null) {
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for (Map.Entry<Integer, byte[]> en : logMap.entrySet()) {
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315 |
SSLExtension ext = SSLExtension.valueOf(
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handshakeMessage.handshakeType(), en.getKey());
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317 |
if (builder.length() != 0) {
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318 |
builder.append(",\n");
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}
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320 |
if (ext != null) {
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builder.append(
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ext.toString(ByteBuffer.wrap(en.getValue())));
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} else {
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builder.append(toString(en.getKey(), en.getValue()));
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}
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}
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327 |
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return builder.toString();
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329 |
} else {
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330 |
for (Map.Entry<SSLExtension, byte[]> en : extMap.entrySet()) {
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331 |
if (builder.length() != 0) {
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332 |
builder.append(",\n");
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}
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334 |
builder.append(
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en.getKey().toString(ByteBuffer.wrap(en.getValue())));
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}
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337 |
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338 |
return builder.toString();
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339 |
}
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340 |
}
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341 |
}
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342 |
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|
343 |
private static String toString(int extId, byte[] extData) {
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|
344 |
MessageFormat messageFormat = new MessageFormat(
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|
345 |
"\"unknown extension ({0})\": '{'\n" +
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|
346 |
"{1}\n" +
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|
347 |
"'}'",
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|
348 |
Locale.ENGLISH);
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349 |
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|
350 |
HexDumpEncoder hexEncoder = new HexDumpEncoder();
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|
351 |
String encoded = hexEncoder.encodeBuffer(extData);
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352 |
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353 |
Object[] messageFields = {
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354 |
extId,
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|
355 |
Utilities.indent(encoded)
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|
356 |
};
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357 |
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|
358 |
return messageFormat.format(messageFields);
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|
359 |
}
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|
2
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360 |
}
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