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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.*;
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import java.util.*;
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import javax.net.ssl.*;
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import sun.security.ssl.SSLCipher.SSLWriteCipher;
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/**
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* DTLS {@code OutputRecord} implementation for {@code SSLEngine}.
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*/
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final class DTLSOutputRecord extends OutputRecord implements DTLSRecord {
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private DTLSFragmenter fragmenter = null;
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int writeEpoch;
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int prevWriteEpoch;
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Authenticator prevWriteAuthenticator;
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SSLWriteCipher prevWriteCipher;
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private final LinkedList<RecordMemo> alertMemos = new LinkedList<>();
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DTLSOutputRecord(HandshakeHash handshakeHash) {
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super(handshakeHash, SSLWriteCipher.nullDTlsWriteCipher());
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this.writeEpoch = 0;
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this.prevWriteEpoch = 0;
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this.prevWriteCipher = SSLWriteCipher.nullDTlsWriteCipher();
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this.packetSize = DTLSRecord.maxRecordSize;
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this.protocolVersion = ProtocolVersion.NONE;
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}
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@Override
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void initHandshaker() {
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// clean up
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fragmenter = null;
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}
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@Override
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void finishHandshake() {
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// fragmenter = null;
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}
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@Override
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void changeWriteCiphers(SSLWriteCipher writeCipher,
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boolean useChangeCipherSpec) throws IOException {
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if (useChangeCipherSpec) {
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encodeChangeCipherSpec();
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}
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prevWriteCipher.dispose();
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this.prevWriteCipher = this.writeCipher;
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this.prevWriteEpoch = this.writeEpoch;
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this.writeCipher = writeCipher;
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this.writeEpoch++;
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this.isFirstAppOutputRecord = true;
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// set the epoch number
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this.writeCipher.authenticator.setEpochNumber(this.writeEpoch);
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}
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@Override
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void encodeAlert(byte level, byte description) throws IOException {
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RecordMemo memo = new RecordMemo();
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memo.contentType = ContentType.ALERT.id;
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memo.majorVersion = protocolVersion.major;
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memo.minorVersion = protocolVersion.minor;
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memo.encodeEpoch = writeEpoch;
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memo.encodeCipher = writeCipher;
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memo.fragment = new byte[2];
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memo.fragment[0] = level;
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memo.fragment[1] = description;
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alertMemos.add(memo);
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}
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@Override
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void encodeChangeCipherSpec() throws IOException {
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if (fragmenter == null) {
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fragmenter = new DTLSFragmenter();
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}
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fragmenter.queueUpChangeCipherSpec();
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}
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@Override
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void encodeHandshake(byte[] source,
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int offset, int length) throws IOException {
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if (firstMessage) {
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firstMessage = false;
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}
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if (fragmenter == null) {
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fragmenter = new DTLSFragmenter();
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}
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fragmenter.queueUpHandshake(source, offset, length);
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}
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@Override
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Ciphertext encode(
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ByteBuffer[] srcs, int srcsOffset, int srcsLength,
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ByteBuffer[] dsts, int dstsOffset, int dstsLength) throws IOException {
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return encode(srcs, srcsOffset, srcsLength, dsts[0]);
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}
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private Ciphertext encode(ByteBuffer[] sources, int offset, int length,
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ByteBuffer destination) throws IOException {
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if (writeCipher.authenticator.seqNumOverflow()) {
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if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
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SSLLogger.fine(
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"sequence number extremely close to overflow " +
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"(2^64-1 packets). Closing connection.");
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}
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throw new SSLHandshakeException("sequence number overflow");
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}
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// Don't process the incoming record until all of the buffered records
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// get handled. May need retransmission if no sources specified.
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if (!isEmpty() || sources == null || sources.length == 0) {
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Ciphertext ct = acquireCiphertext(destination);
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if (ct != null) {
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return ct;
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}
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}
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if (sources == null || sources.length == 0) {
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return null;
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}
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int srcsRemains = 0;
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for (int i = offset; i < offset + length; i++) {
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srcsRemains += sources[i].remaining();
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}
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if (srcsRemains == 0) {
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return null;
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}
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// not apply to handshake message
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int fragLen;
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if (packetSize > 0) {
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fragLen = Math.min(maxRecordSize, packetSize);
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fragLen = writeCipher.calculateFragmentSize(
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fragLen, headerSize);
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fragLen = Math.min(fragLen, Record.maxDataSize);
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} else {
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fragLen = Record.maxDataSize;
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}
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if (fragmentSize > 0) {
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fragLen = Math.min(fragLen, fragmentSize);
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}
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int dstPos = destination.position();
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int dstLim = destination.limit();
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int dstContent = dstPos + headerSize +
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writeCipher.getExplicitNonceSize();
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destination.position(dstContent);
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int remains = Math.min(fragLen, destination.remaining());
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fragLen = 0;
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int srcsLen = offset + length;
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for (int i = offset; (i < srcsLen) && (remains > 0); i++) {
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int amount = Math.min(sources[i].remaining(), remains);
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int srcLimit = sources[i].limit();
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sources[i].limit(sources[i].position() + amount);
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destination.put(sources[i]);
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sources[i].limit(srcLimit); // restore the limit
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remains -= amount;
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fragLen += amount;
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}
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destination.limit(destination.position());
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destination.position(dstContent);
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if (SSLLogger.isOn && SSLLogger.isOn("record")) {
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SSLLogger.fine(
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"WRITE: " + protocolVersion + " " +
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ContentType.APPLICATION_DATA.name +
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", length = " + destination.remaining());
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}
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// Encrypt the fragment and wrap up a record.
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long recordSN = encrypt(writeCipher,
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ContentType.APPLICATION_DATA.id, destination,
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dstPos, dstLim, headerSize,
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protocolVersion);
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if (SSLLogger.isOn && SSLLogger.isOn("packet")) {
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ByteBuffer temporary = destination.duplicate();
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temporary.limit(temporary.position());
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temporary.position(dstPos);
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SSLLogger.fine("Raw write", temporary);
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}
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// remain the limit unchanged
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destination.limit(dstLim);
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return new Ciphertext(ContentType.APPLICATION_DATA.id,
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SSLHandshake.NOT_APPLICABLE.id, recordSN);
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}
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private Ciphertext acquireCiphertext(
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ByteBuffer destination) throws IOException {
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if (alertMemos != null && !alertMemos.isEmpty()) {
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RecordMemo memo = alertMemos.pop();
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int dstPos = destination.position();
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int dstLim = destination.limit();
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int dstContent = dstPos + headerSize +
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writeCipher.getExplicitNonceSize();
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destination.position(dstContent);
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destination.put(memo.fragment);
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destination.limit(destination.position());
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destination.position(dstContent);
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if (SSLLogger.isOn && SSLLogger.isOn("record")) {
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SSLLogger.fine(
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"WRITE: " + protocolVersion + " " +
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ContentType.ALERT.name +
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", length = " + destination.remaining());
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}
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// Encrypt the fragment and wrap up a record.
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long recordSN = encrypt(memo.encodeCipher,
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ContentType.ALERT.id,
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destination, dstPos, dstLim, headerSize,
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ProtocolVersion.valueOf(memo.majorVersion,
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memo.minorVersion));
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if (SSLLogger.isOn && SSLLogger.isOn("packet")) {
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ByteBuffer temporary = destination.duplicate();
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temporary.limit(temporary.position());
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temporary.position(dstPos);
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SSLLogger.fine("Raw write", temporary);
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}
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// remain the limit unchanged
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destination.limit(dstLim);
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return new Ciphertext(ContentType.ALERT.id,
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SSLHandshake.NOT_APPLICABLE.id, recordSN);
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}
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if (fragmenter != null) {
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return fragmenter.acquireCiphertext(destination);
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}
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return null;
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}
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@Override
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boolean isEmpty() {
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return ((fragmenter == null) || fragmenter.isEmpty()) &&
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((alertMemos == null) || alertMemos.isEmpty());
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}
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@Override
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void launchRetransmission() {
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// Note: Please don't retransmit if there are handshake messages
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// or alerts waiting in the queue.
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if (((alertMemos == null) || alertMemos.isEmpty()) &&
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(fragmenter != null) && fragmenter.isRetransmittable()) {
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fragmenter.setRetransmission();
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}
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}
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// buffered record fragment
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private static class RecordMemo {
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byte contentType;
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byte majorVersion;
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byte minorVersion;
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int encodeEpoch;
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SSLWriteCipher encodeCipher;
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byte[] fragment;
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}
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private static class HandshakeMemo extends RecordMemo {
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byte handshakeType;
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int messageSequence;
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int acquireOffset;
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}
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private final class DTLSFragmenter {
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private final LinkedList<RecordMemo> handshakeMemos =
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new LinkedList<>();
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private int acquireIndex = 0;
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private int messageSequence = 0;
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private boolean flightIsReady = false;
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// Per section 4.1.1, RFC 6347:
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//
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// If repeated retransmissions do not result in a response, and the
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// PMTU is unknown, subsequent retransmissions SHOULD back off to a
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// smaller record size, fragmenting the handshake message as
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// appropriate.
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//
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// In this implementation, two times of retransmits would be attempted
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// before backing off. The back off is supported only if the packet
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// size is bigger than 256 bytes.
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private int retransmits = 2; // attemps of retransmits
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void queueUpChangeCipherSpec() {
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// Cleanup if a new flight starts.
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if (flightIsReady) {
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handshakeMemos.clear();
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acquireIndex = 0;
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flightIsReady = false;
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}
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RecordMemo memo = new RecordMemo();
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memo.contentType = ContentType.CHANGE_CIPHER_SPEC.id;
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memo.majorVersion = protocolVersion.major;
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memo.minorVersion = protocolVersion.minor;
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memo.encodeEpoch = writeEpoch;
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memo.encodeCipher = writeCipher;
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memo.fragment = new byte[1];
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memo.fragment[0] = 1;
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handshakeMemos.add(memo);
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}
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void queueUpHandshake(byte[] buf,
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int offset, int length) throws IOException {
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// Cleanup if a new flight starts.
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if (flightIsReady) {
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handshakeMemos.clear();
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acquireIndex = 0;
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flightIsReady = false;
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}
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HandshakeMemo memo = new HandshakeMemo();
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memo.contentType = ContentType.HANDSHAKE.id;
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memo.majorVersion = protocolVersion.major;
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memo.minorVersion = protocolVersion.minor;
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memo.encodeEpoch = writeEpoch;
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memo.encodeCipher = writeCipher;
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memo.handshakeType = buf[offset];
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memo.messageSequence = messageSequence++;
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memo.acquireOffset = 0;
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memo.fragment = new byte[length - 4]; // 4: header size
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// 1: HandshakeType
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// 3: message length
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System.arraycopy(buf, offset + 4, memo.fragment, 0, length - 4);
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handshakeHashing(memo, memo.fragment);
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handshakeMemos.add(memo);
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if ((memo.handshakeType == SSLHandshake.CLIENT_HELLO.id) ||
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(memo.handshakeType == SSLHandshake.HELLO_REQUEST.id) ||
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(memo.handshakeType ==
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SSLHandshake.HELLO_VERIFY_REQUEST.id) ||
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(memo.handshakeType == SSLHandshake.SERVER_HELLO_DONE.id) ||
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(memo.handshakeType == SSLHandshake.FINISHED.id)) {
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flightIsReady = true;
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}
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}
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Ciphertext acquireCiphertext(ByteBuffer dstBuf) throws IOException {
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if (isEmpty()) {
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if (isRetransmittable()) {
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setRetransmission(); // configure for retransmission
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} else {
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return null;
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}
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}
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RecordMemo memo = handshakeMemos.get(acquireIndex);
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HandshakeMemo hsMemo = null;
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if (memo.contentType == ContentType.HANDSHAKE.id) {
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hsMemo = (HandshakeMemo)memo;
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}
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// ChangeCipherSpec message is pretty small. Don't worry about
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// the fragmentation of ChangeCipherSpec record.
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421 |
int fragLen;
|
|
422 |
if (packetSize > 0) {
|
|
423 |
fragLen = Math.min(maxRecordSize, packetSize);
|
|
424 |
fragLen = memo.encodeCipher.calculateFragmentSize(
|
56542
|
425 |
fragLen, 25); // 25: header size
|
30904
|
426 |
// 13: DTLS record
|
|
427 |
// 12: DTLS handshake message
|
|
428 |
fragLen = Math.min(fragLen, Record.maxDataSize);
|
|
429 |
} else {
|
|
430 |
fragLen = Record.maxDataSize;
|
|
431 |
}
|
|
432 |
|
|
433 |
if (fragmentSize > 0) {
|
|
434 |
fragLen = Math.min(fragLen, fragmentSize);
|
|
435 |
}
|
|
436 |
|
|
437 |
int dstPos = dstBuf.position();
|
|
438 |
int dstLim = dstBuf.limit();
|
|
439 |
int dstContent = dstPos + headerSize +
|
|
440 |
memo.encodeCipher.getExplicitNonceSize();
|
|
441 |
dstBuf.position(dstContent);
|
|
442 |
|
|
443 |
if (hsMemo != null) {
|
|
444 |
fragLen = Math.min(fragLen,
|
|
445 |
(hsMemo.fragment.length - hsMemo.acquireOffset));
|
|
446 |
|
|
447 |
dstBuf.put(hsMemo.handshakeType);
|
|
448 |
dstBuf.put((byte)((hsMemo.fragment.length >> 16) & 0xFF));
|
|
449 |
dstBuf.put((byte)((hsMemo.fragment.length >> 8) & 0xFF));
|
|
450 |
dstBuf.put((byte)(hsMemo.fragment.length & 0xFF));
|
|
451 |
dstBuf.put((byte)((hsMemo.messageSequence >> 8) & 0xFF));
|
|
452 |
dstBuf.put((byte)(hsMemo.messageSequence & 0xFF));
|
|
453 |
dstBuf.put((byte)((hsMemo.acquireOffset >> 16) & 0xFF));
|
|
454 |
dstBuf.put((byte)((hsMemo.acquireOffset >> 8) & 0xFF));
|
|
455 |
dstBuf.put((byte)(hsMemo.acquireOffset & 0xFF));
|
|
456 |
dstBuf.put((byte)((fragLen >> 16) & 0xFF));
|
|
457 |
dstBuf.put((byte)((fragLen >> 8) & 0xFF));
|
|
458 |
dstBuf.put((byte)(fragLen & 0xFF));
|
|
459 |
dstBuf.put(hsMemo.fragment, hsMemo.acquireOffset, fragLen);
|
|
460 |
} else {
|
|
461 |
fragLen = Math.min(fragLen, memo.fragment.length);
|
|
462 |
dstBuf.put(memo.fragment, 0, fragLen);
|
|
463 |
}
|
|
464 |
|
|
465 |
dstBuf.limit(dstBuf.position());
|
|
466 |
dstBuf.position(dstContent);
|
|
467 |
|
56542
|
468 |
if (SSLLogger.isOn && SSLLogger.isOn("record")) {
|
|
469 |
SSLLogger.fine(
|
|
470 |
"WRITE: " + protocolVersion + " " +
|
|
471 |
ContentType.nameOf(memo.contentType) +
|
30904
|
472 |
", length = " + dstBuf.remaining());
|
|
473 |
}
|
|
474 |
|
|
475 |
// Encrypt the fragment and wrap up a record.
|
56542
|
476 |
long recordSN = encrypt(memo.encodeCipher,
|
30904
|
477 |
memo.contentType, dstBuf,
|
|
478 |
dstPos, dstLim, headerSize,
|
|
479 |
ProtocolVersion.valueOf(memo.majorVersion,
|
56542
|
480 |
memo.minorVersion));
|
30904
|
481 |
|
56542
|
482 |
if (SSLLogger.isOn && SSLLogger.isOn("packet")) {
|
30904
|
483 |
ByteBuffer temporary = dstBuf.duplicate();
|
|
484 |
temporary.limit(temporary.position());
|
|
485 |
temporary.position(dstPos);
|
56542
|
486 |
SSLLogger.fine(
|
|
487 |
"Raw write (" + temporary.remaining() + ")", temporary);
|
30904
|
488 |
}
|
|
489 |
|
|
490 |
// remain the limit unchanged
|
|
491 |
dstBuf.limit(dstLim);
|
|
492 |
|
|
493 |
// Reset the fragmentation offset.
|
|
494 |
if (hsMemo != null) {
|
|
495 |
hsMemo.acquireOffset += fragLen;
|
|
496 |
if (hsMemo.acquireOffset == hsMemo.fragment.length) {
|
|
497 |
acquireIndex++;
|
|
498 |
}
|
|
499 |
|
56542
|
500 |
return new Ciphertext(hsMemo.contentType,
|
|
501 |
hsMemo.handshakeType, recordSN);
|
30904
|
502 |
} else {
|
|
503 |
acquireIndex++;
|
56542
|
504 |
return new Ciphertext(ContentType.CHANGE_CIPHER_SPEC.id,
|
|
505 |
SSLHandshake.NOT_APPLICABLE.id, recordSN);
|
30904
|
506 |
}
|
|
507 |
}
|
|
508 |
|
|
509 |
private void handshakeHashing(HandshakeMemo hsFrag, byte[] hsBody) {
|
|
510 |
|
|
511 |
byte hsType = hsFrag.handshakeType;
|
56542
|
512 |
if (!handshakeHash.isHashable(hsType)) {
|
30904
|
513 |
// omitted from handshake hash computation
|
|
514 |
return;
|
|
515 |
}
|
|
516 |
|
|
517 |
// calculate the DTLS header
|
|
518 |
byte[] temporary = new byte[12]; // 12: handshake header size
|
|
519 |
|
|
520 |
// Handshake.msg_type
|
|
521 |
temporary[0] = hsFrag.handshakeType;
|
|
522 |
|
|
523 |
// Handshake.length
|
|
524 |
temporary[1] = (byte)((hsBody.length >> 16) & 0xFF);
|
|
525 |
temporary[2] = (byte)((hsBody.length >> 8) & 0xFF);
|
|
526 |
temporary[3] = (byte)(hsBody.length & 0xFF);
|
|
527 |
|
|
528 |
// Handshake.message_seq
|
|
529 |
temporary[4] = (byte)((hsFrag.messageSequence >> 8) & 0xFF);
|
|
530 |
temporary[5] = (byte)(hsFrag.messageSequence & 0xFF);
|
|
531 |
|
|
532 |
// Handshake.fragment_offset
|
|
533 |
temporary[6] = 0;
|
|
534 |
temporary[7] = 0;
|
|
535 |
temporary[8] = 0;
|
|
536 |
|
|
537 |
// Handshake.fragment_length
|
|
538 |
temporary[9] = temporary[1];
|
|
539 |
temporary[10] = temporary[2];
|
|
540 |
temporary[11] = temporary[3];
|
|
541 |
|
56542
|
542 |
handshakeHash.deliver(temporary, 0, 12);
|
|
543 |
handshakeHash.deliver(hsBody, 0, hsBody.length);
|
30904
|
544 |
}
|
|
545 |
|
|
546 |
boolean isEmpty() {
|
|
547 |
if (!flightIsReady || handshakeMemos.isEmpty() ||
|
|
548 |
acquireIndex >= handshakeMemos.size()) {
|
|
549 |
return true;
|
|
550 |
}
|
|
551 |
|
|
552 |
return false;
|
|
553 |
}
|
|
554 |
|
|
555 |
boolean isRetransmittable() {
|
|
556 |
return (flightIsReady && !handshakeMemos.isEmpty() &&
|
|
557 |
(acquireIndex >= handshakeMemos.size()));
|
|
558 |
}
|
|
559 |
|
|
560 |
private void setRetransmission() {
|
|
561 |
acquireIndex = 0;
|
|
562 |
for (RecordMemo memo : handshakeMemos) {
|
|
563 |
if (memo instanceof HandshakeMemo) {
|
|
564 |
HandshakeMemo hmemo = (HandshakeMemo)memo;
|
|
565 |
hmemo.acquireOffset = 0;
|
|
566 |
}
|
|
567 |
}
|
|
568 |
|
|
569 |
// Shrink packet size if:
|
|
570 |
// 1. maximum fragment size is allowed, in which case the packet
|
|
571 |
// size is configured bigger than maxRecordSize;
|
|
572 |
// 2. maximum packet is bigger than 256 bytes;
|
|
573 |
// 3. two times of retransmits have been attempted.
|
|
574 |
if ((packetSize <= maxRecordSize) &&
|
|
575 |
(packetSize > 256) && ((retransmits--) <= 0)) {
|
|
576 |
|
|
577 |
// shrink packet size
|
|
578 |
shrinkPacketSize();
|
|
579 |
retransmits = 2; // attemps of retransmits
|
|
580 |
}
|
|
581 |
}
|
|
582 |
|
|
583 |
private void shrinkPacketSize() {
|
|
584 |
packetSize = Math.max(256, packetSize / 2);
|
|
585 |
}
|
|
586 |
}
|
|
587 |
}
|