kafka SslTransportLayer 源码
kafka SslTransportLayer 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/network/SslTransportLayer.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.common.network;
import java.io.IOException;
import java.io.EOFException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.SocketChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.CancelledKeyException;
import java.security.Principal;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLEngineResult.HandshakeStatus;
import javax.net.ssl.SSLEngineResult.Status;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLHandshakeException;
import javax.net.ssl.SSLKeyException;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLProtocolException;
import javax.net.ssl.SSLSession;
import org.apache.kafka.common.errors.SslAuthenticationException;
import org.apache.kafka.common.security.auth.KafkaPrincipal;
import org.apache.kafka.common.utils.ByteUtils;
import org.apache.kafka.common.utils.LogContext;
import org.apache.kafka.common.utils.ByteBufferUnmapper;
import org.apache.kafka.common.utils.Utils;
import org.slf4j.Logger;
/*
* Transport layer for SSL communication
*
*
* TLS v1.3 notes:
* https://tools.ietf.org/html/rfc8446#section-4.6 : Post-Handshake Messages
* "TLS also allows other messages to be sent after the main handshake.
* These messages use a handshake content type and are encrypted under
* the appropriate application traffic key."
*/
public class SslTransportLayer implements TransportLayer {
private enum State {
// Initial state
NOT_INITIALIZED,
// SSLEngine is in handshake mode
HANDSHAKE,
// SSL handshake failed, connection will be terminated
HANDSHAKE_FAILED,
// SSLEngine has completed handshake, post-handshake messages may be pending for TLSv1.3
POST_HANDSHAKE,
// SSLEngine has completed handshake, any post-handshake messages have been processed for TLSv1.3
// For TLSv1.3, we move the channel to READY state when incoming data is processed after handshake
READY,
// Channel is being closed
CLOSING
}
private static final String TLS13 = "TLSv1.3";
private final String channelId;
private final SSLEngine sslEngine;
private final SelectionKey key;
private final SocketChannel socketChannel;
private final ChannelMetadataRegistry metadataRegistry;
private final Logger log;
private HandshakeStatus handshakeStatus;
private SSLEngineResult handshakeResult;
private State state;
private SslAuthenticationException handshakeException;
private ByteBuffer netReadBuffer;
private ByteBuffer netWriteBuffer;
private ByteBuffer appReadBuffer;
private ByteBuffer fileChannelBuffer;
private boolean hasBytesBuffered;
public static SslTransportLayer create(String channelId, SelectionKey key, SSLEngine sslEngine,
ChannelMetadataRegistry metadataRegistry) throws IOException {
return new SslTransportLayer(channelId, key, sslEngine, metadataRegistry);
}
// Prefer `create`, only use this in tests
SslTransportLayer(String channelId, SelectionKey key, SSLEngine sslEngine,
ChannelMetadataRegistry metadataRegistry) {
this.channelId = channelId;
this.key = key;
this.socketChannel = (SocketChannel) key.channel();
this.sslEngine = sslEngine;
this.state = State.NOT_INITIALIZED;
this.metadataRegistry = metadataRegistry;
final LogContext logContext = new LogContext(String.format("[SslTransportLayer channelId=%s key=%s] ", channelId, key));
this.log = logContext.logger(getClass());
}
// Visible for testing
protected void startHandshake() throws IOException {
if (state != State.NOT_INITIALIZED)
throw new IllegalStateException("startHandshake() can only be called once, state " + state);
this.netReadBuffer = ByteBuffer.allocate(netReadBufferSize());
this.netWriteBuffer = ByteBuffer.allocate(netWriteBufferSize());
this.appReadBuffer = ByteBuffer.allocate(applicationBufferSize());
netWriteBuffer.limit(0);
netReadBuffer.limit(0);
state = State.HANDSHAKE;
//initiate handshake
sslEngine.beginHandshake();
handshakeStatus = sslEngine.getHandshakeStatus();
}
@Override
public boolean ready() {
return state == State.POST_HANDSHAKE || state == State.READY;
}
/**
* does socketChannel.finishConnect()
*/
@Override
public boolean finishConnect() throws IOException {
boolean connected = socketChannel.finishConnect();
if (connected)
key.interestOps(key.interestOps() & ~SelectionKey.OP_CONNECT | SelectionKey.OP_READ);
return connected;
}
/**
* disconnects selectionKey.
*/
@Override
public void disconnect() {
key.cancel();
}
@Override
public SocketChannel socketChannel() {
return socketChannel;
}
@Override
public SelectionKey selectionKey() {
return key;
}
@Override
public boolean isOpen() {
return socketChannel.isOpen();
}
@Override
public boolean isConnected() {
return socketChannel.isConnected();
}
/**
* Sends an SSL close message and closes socketChannel.
*/
@Override
public void close() throws IOException {
State prevState = state;
if (state == State.CLOSING) return;
state = State.CLOSING;
sslEngine.closeOutbound();
try {
if (prevState != State.NOT_INITIALIZED && isConnected()) {
if (!flush(netWriteBuffer)) {
throw new IOException("Remaining data in the network buffer, can't send SSL close message.");
}
//prep the buffer for the close message
netWriteBuffer.clear();
//perform the close, since we called sslEngine.closeOutbound
SSLEngineResult wrapResult = sslEngine.wrap(ByteUtils.EMPTY_BUF, netWriteBuffer);
//we should be in a close state
if (wrapResult.getStatus() != SSLEngineResult.Status.CLOSED) {
throw new IOException("Unexpected status returned by SSLEngine.wrap, expected CLOSED, received " +
wrapResult.getStatus() + ". Will not send close message to peer.");
}
netWriteBuffer.flip();
flush(netWriteBuffer);
}
} catch (IOException ie) {
log.debug("Failed to send SSL Close message", ie);
} finally {
socketChannel.socket().close();
socketChannel.close();
netReadBuffer = null;
netWriteBuffer = null;
appReadBuffer = null;
if (fileChannelBuffer != null) {
ByteBufferUnmapper.unmap("fileChannelBuffer", fileChannelBuffer);
fileChannelBuffer = null;
}
}
}
/**
* returns true if there are any pending contents in netWriteBuffer
*/
@Override
public boolean hasPendingWrites() {
return netWriteBuffer.hasRemaining();
}
/**
* Reads available bytes from socket channel to `netReadBuffer`.
* Visible for testing.
* @return number of bytes read
*/
protected int readFromSocketChannel() throws IOException {
return socketChannel.read(netReadBuffer);
}
/**
* Flushes the buffer to the network, non blocking.
* Visible for testing.
* @param buf ByteBuffer
* @return boolean true if the buffer has been emptied out, false otherwise
* @throws IOException
*/
protected boolean flush(ByteBuffer buf) throws IOException {
int remaining = buf.remaining();
if (remaining > 0) {
int written = socketChannel.write(buf);
return written >= remaining;
}
return true;
}
/**
* Performs SSL handshake, non blocking.
* Before application data (kafka protocols) can be sent client & kafka broker must
* perform ssl handshake.
* During the handshake SSLEngine generates encrypted data that will be transported over socketChannel.
* Each SSLEngine operation generates SSLEngineResult , of which SSLEngineResult.handshakeStatus field is used to
* determine what operation needs to occur to move handshake along.
* A typical handshake might look like this.
* +-------------+----------------------------------+-------------+
* | client | SSL/TLS message | HSStatus |
* +-------------+----------------------------------+-------------+
* | wrap() | ClientHello | NEED_UNWRAP |
* | unwrap() | ServerHello/Cert/ServerHelloDone | NEED_WRAP |
* | wrap() | ClientKeyExchange | NEED_WRAP |
* | wrap() | ChangeCipherSpec | NEED_WRAP |
* | wrap() | Finished | NEED_UNWRAP |
* | unwrap() | ChangeCipherSpec | NEED_UNWRAP |
* | unwrap() | Finished | FINISHED |
* +-------------+----------------------------------+-------------+
*
* @throws IOException if read/write fails
* @throws SslAuthenticationException if handshake fails with an {@link SSLException}
*/
@Override
public void handshake() throws IOException {
if (state == State.NOT_INITIALIZED) {
try {
startHandshake();
} catch (SSLException e) {
maybeProcessHandshakeFailure(e, false, null);
}
}
if (ready())
throw renegotiationException();
if (state == State.CLOSING)
throw closingException();
int read = 0;
boolean readable = key.isReadable();
try {
// Read any available bytes before attempting any writes to ensure that handshake failures
// reported by the peer are processed even if writes fail (since peer closes connection
// if handshake fails)
if (readable)
read = readFromSocketChannel();
doHandshake();
if (ready())
updateBytesBuffered(true);
} catch (SSLException e) {
maybeProcessHandshakeFailure(e, true, null);
} catch (IOException e) {
maybeThrowSslAuthenticationException();
// This exception could be due to a write. If there is data available to unwrap in the buffer, or data available
// in the socket channel to read and unwrap, process the data so that any SSL handshake exceptions are reported.
try {
do {
log.trace("Process any available bytes from peer, netReadBuffer {} netWriterBuffer {} handshakeStatus {} readable? {}",
netReadBuffer, netWriteBuffer, handshakeStatus, readable);
handshakeWrapAfterFailure(false);
handshakeUnwrap(false, true);
} while (readable && readFromSocketChannel() > 0);
} catch (SSLException e1) {
maybeProcessHandshakeFailure(e1, false, e);
}
// If we get here, this is not a handshake failure, throw the original IOException
throw e;
}
// Read from socket failed, so throw any pending handshake exception or EOF exception.
if (read == -1) {
maybeThrowSslAuthenticationException();
throw new EOFException("EOF during handshake, handshake status is " + handshakeStatus);
}
}
@SuppressWarnings("fallthrough")
private void doHandshake() throws IOException {
boolean read = key.isReadable();
boolean write = key.isWritable();
handshakeStatus = sslEngine.getHandshakeStatus();
if (!flush(netWriteBuffer)) {
key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);
return;
}
// Throw any pending handshake exception since `netWriteBuffer` has been flushed
maybeThrowSslAuthenticationException();
switch (handshakeStatus) {
case NEED_TASK:
log.trace("SSLHandshake NEED_TASK channelId {}, appReadBuffer pos {}, netReadBuffer pos {}, netWriteBuffer pos {}",
channelId, appReadBuffer.position(), netReadBuffer.position(), netWriteBuffer.position());
handshakeStatus = runDelegatedTasks();
break;
case NEED_WRAP:
log.trace("SSLHandshake NEED_WRAP channelId {}, appReadBuffer pos {}, netReadBuffer pos {}, netWriteBuffer pos {}",
channelId, appReadBuffer.position(), netReadBuffer.position(), netWriteBuffer.position());
handshakeResult = handshakeWrap(write);
if (handshakeResult.getStatus() == Status.BUFFER_OVERFLOW) {
int currentNetWriteBufferSize = netWriteBufferSize();
netWriteBuffer.compact();
netWriteBuffer = Utils.ensureCapacity(netWriteBuffer, currentNetWriteBufferSize);
netWriteBuffer.flip();
if (netWriteBuffer.limit() >= currentNetWriteBufferSize) {
throw new IllegalStateException("Buffer overflow when available data size (" + netWriteBuffer.limit() +
") >= network buffer size (" + currentNetWriteBufferSize + ")");
}
} else if (handshakeResult.getStatus() == Status.BUFFER_UNDERFLOW) {
throw new IllegalStateException("Should not have received BUFFER_UNDERFLOW during handshake WRAP.");
} else if (handshakeResult.getStatus() == Status.CLOSED) {
throw new EOFException();
}
log.trace("SSLHandshake NEED_WRAP channelId {}, handshakeResult {}, appReadBuffer pos {}, netReadBuffer pos {}, netWriteBuffer pos {}",
channelId, handshakeResult, appReadBuffer.position(), netReadBuffer.position(), netWriteBuffer.position());
//if handshake status is not NEED_UNWRAP or unable to flush netWriteBuffer contents
//we will break here otherwise we can do need_unwrap in the same call.
if (handshakeStatus != HandshakeStatus.NEED_UNWRAP || !flush(netWriteBuffer)) {
key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);
break;
}
case NEED_UNWRAP:
log.trace("SSLHandshake NEED_UNWRAP channelId {}, appReadBuffer pos {}, netReadBuffer pos {}, netWriteBuffer pos {}",
channelId, appReadBuffer.position(), netReadBuffer.position(), netWriteBuffer.position());
do {
handshakeResult = handshakeUnwrap(read, false);
if (handshakeResult.getStatus() == Status.BUFFER_OVERFLOW) {
int currentAppBufferSize = applicationBufferSize();
appReadBuffer = Utils.ensureCapacity(appReadBuffer, currentAppBufferSize);
if (appReadBuffer.position() > currentAppBufferSize) {
throw new IllegalStateException("Buffer underflow when available data size (" + appReadBuffer.position() +
") > packet buffer size (" + currentAppBufferSize + ")");
}
}
} while (handshakeResult.getStatus() == Status.BUFFER_OVERFLOW);
if (handshakeResult.getStatus() == Status.BUFFER_UNDERFLOW) {
int currentNetReadBufferSize = netReadBufferSize();
netReadBuffer = Utils.ensureCapacity(netReadBuffer, currentNetReadBufferSize);
if (netReadBuffer.position() >= currentNetReadBufferSize) {
throw new IllegalStateException("Buffer underflow when there is available data");
}
} else if (handshakeResult.getStatus() == Status.CLOSED) {
throw new EOFException("SSL handshake status CLOSED during handshake UNWRAP");
}
log.trace("SSLHandshake NEED_UNWRAP channelId {}, handshakeResult {}, appReadBuffer pos {}, netReadBuffer pos {}, netWriteBuffer pos {}",
channelId, handshakeResult, appReadBuffer.position(), netReadBuffer.position(), netWriteBuffer.position());
//if handshakeStatus completed than fall-through to finished status.
//after handshake is finished there is no data left to read/write in socketChannel.
//so the selector won't invoke this channel if we don't go through the handshakeFinished here.
if (handshakeStatus != HandshakeStatus.FINISHED) {
if (handshakeStatus == HandshakeStatus.NEED_WRAP) {
key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);
} else if (handshakeStatus == HandshakeStatus.NEED_UNWRAP) {
key.interestOps(key.interestOps() & ~SelectionKey.OP_WRITE);
}
break;
}
case FINISHED:
handshakeFinished();
break;
case NOT_HANDSHAKING:
handshakeFinished();
break;
default:
throw new IllegalStateException(String.format("Unexpected status [%s]", handshakeStatus));
}
}
private SSLHandshakeException renegotiationException() {
return new SSLHandshakeException("Renegotiation is not supported");
}
private IllegalStateException closingException() {
throw new IllegalStateException("Channel is in closing state");
}
/**
* Executes the SSLEngine tasks needed.
* @return HandshakeStatus
*/
private HandshakeStatus runDelegatedTasks() {
for (;;) {
Runnable task = delegatedTask();
if (task == null) {
break;
}
task.run();
}
return sslEngine.getHandshakeStatus();
}
/**
* Checks if the handshake status is finished
* Sets the interestOps for the selectionKey.
*/
private void handshakeFinished() throws IOException {
// SSLEngine.getHandshakeStatus is transient and it doesn't record FINISHED status properly.
// It can move from FINISHED status to NOT_HANDSHAKING after the handshake is completed.
// Hence we also need to check handshakeResult.getHandshakeStatus() if the handshake finished or not
if (handshakeResult.getHandshakeStatus() == HandshakeStatus.FINISHED) {
//we are complete if we have delivered the last packet
//remove OP_WRITE if we are complete, otherwise we still have data to write
if (netWriteBuffer.hasRemaining())
key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);
else {
SSLSession session = sslEngine.getSession();
state = session.getProtocol().equals(TLS13) ? State.POST_HANDSHAKE : State.READY;
key.interestOps(key.interestOps() & ~SelectionKey.OP_WRITE);
log.debug("SSL handshake completed successfully with peerHost '{}' peerPort {} peerPrincipal '{}' protocol '{}' cipherSuite '{}'",
session.getPeerHost(), session.getPeerPort(), peerPrincipal(), session.getProtocol(), session.getCipherSuite());
metadataRegistry.registerCipherInformation(
new CipherInformation(session.getCipherSuite(), session.getProtocol()));
}
log.trace("SSLHandshake FINISHED channelId {}, appReadBuffer pos {}, netReadBuffer pos {}, netWriteBuffer pos {} ",
channelId, appReadBuffer.position(), netReadBuffer.position(), netWriteBuffer.position());
} else {
throw new IOException("NOT_HANDSHAKING during handshake");
}
}
/**
* Performs the WRAP function
* @param doWrite boolean
* @return SSLEngineResult
* @throws IOException
*/
private SSLEngineResult handshakeWrap(boolean doWrite) throws IOException {
log.trace("SSLHandshake handshakeWrap {}", channelId);
if (netWriteBuffer.hasRemaining())
throw new IllegalStateException("handshakeWrap called with netWriteBuffer not empty");
//this should never be called with a network buffer that contains data
//so we can clear it here.
netWriteBuffer.clear();
SSLEngineResult result;
try {
result = sslEngine.wrap(ByteUtils.EMPTY_BUF, netWriteBuffer);
} finally {
//prepare the results to be written
netWriteBuffer.flip();
}
handshakeStatus = result.getHandshakeStatus();
if (result.getStatus() == SSLEngineResult.Status.OK &&
result.getHandshakeStatus() == HandshakeStatus.NEED_TASK) {
handshakeStatus = runDelegatedTasks();
}
if (doWrite) flush(netWriteBuffer);
return result;
}
/**
* Perform handshake unwrap
* @param doRead boolean If true, read more from the socket channel
* @param ignoreHandshakeStatus If true, continue to unwrap if data available regardless of handshake status
* @return SSLEngineResult
* @throws IOException
*/
private SSLEngineResult handshakeUnwrap(boolean doRead, boolean ignoreHandshakeStatus) throws IOException {
log.trace("SSLHandshake handshakeUnwrap {}", channelId);
SSLEngineResult result;
int read = 0;
if (doRead)
read = readFromSocketChannel();
boolean cont;
do {
//prepare the buffer with the incoming data
int position = netReadBuffer.position();
netReadBuffer.flip();
result = sslEngine.unwrap(netReadBuffer, appReadBuffer);
netReadBuffer.compact();
handshakeStatus = result.getHandshakeStatus();
if (result.getStatus() == SSLEngineResult.Status.OK &&
result.getHandshakeStatus() == HandshakeStatus.NEED_TASK) {
handshakeStatus = runDelegatedTasks();
}
cont = (result.getStatus() == SSLEngineResult.Status.OK &&
handshakeStatus == HandshakeStatus.NEED_UNWRAP) ||
(ignoreHandshakeStatus && netReadBuffer.position() != position);
log.trace("SSLHandshake handshakeUnwrap: handshakeStatus {} status {}", handshakeStatus, result.getStatus());
} while (netReadBuffer.position() != 0 && cont);
// Throw EOF exception for failed read after processing already received data
// so that handshake failures are reported correctly
if (read == -1)
throw new EOFException("EOF during handshake, handshake status is " + handshakeStatus);
return result;
}
/**
* Reads a sequence of bytes from this channel into the given buffer. Reads as much as possible
* until either the dst buffer is full or there is no more data in the socket.
*
* @param dst The buffer into which bytes are to be transferred
* @return The number of bytes read, possible zero or -1 if the channel has reached end-of-stream
* and no more data is available
* @throws IOException if some other I/O error occurs
*/
@Override
public int read(ByteBuffer dst) throws IOException {
if (state == State.CLOSING) return -1;
else if (!ready()) return 0;
//if we have unread decrypted data in appReadBuffer read that into dst buffer.
int read = 0;
if (appReadBuffer.position() > 0) {
read = readFromAppBuffer(dst);
}
boolean readFromNetwork = false;
boolean isClosed = false;
// Each loop reads at most once from the socket.
while (dst.remaining() > 0) {
int netread = 0;
netReadBuffer = Utils.ensureCapacity(netReadBuffer, netReadBufferSize());
if (netReadBuffer.remaining() > 0) {
netread = readFromSocketChannel();
if (netread > 0)
readFromNetwork = true;
}
while (netReadBuffer.position() > 0) {
netReadBuffer.flip();
SSLEngineResult unwrapResult;
try {
unwrapResult = sslEngine.unwrap(netReadBuffer, appReadBuffer);
if (state == State.POST_HANDSHAKE && appReadBuffer.position() != 0) {
// For TLSv1.3, we have finished processing post-handshake messages since we are now processing data
state = State.READY;
}
} catch (SSLException e) {
// For TLSv1.3, handle SSL exceptions while processing post-handshake messages as authentication exceptions
if (state == State.POST_HANDSHAKE) {
state = State.HANDSHAKE_FAILED;
throw new SslAuthenticationException("Failed to process post-handshake messages", e);
} else
throw e;
}
netReadBuffer.compact();
// reject renegotiation if TLS < 1.3, key updates for TLS 1.3 are allowed
if (unwrapResult.getHandshakeStatus() != HandshakeStatus.NOT_HANDSHAKING &&
unwrapResult.getHandshakeStatus() != HandshakeStatus.FINISHED &&
unwrapResult.getStatus() == Status.OK &&
!sslEngine.getSession().getProtocol().equals(TLS13)) {
log.error("Renegotiation requested, but it is not supported, channelId {}, " +
"appReadBuffer pos {}, netReadBuffer pos {}, netWriteBuffer pos {} handshakeStatus {}", channelId,
appReadBuffer.position(), netReadBuffer.position(), netWriteBuffer.position(), unwrapResult.getHandshakeStatus());
throw renegotiationException();
}
if (unwrapResult.getStatus() == Status.OK) {
read += readFromAppBuffer(dst);
} else if (unwrapResult.getStatus() == Status.BUFFER_OVERFLOW) {
int currentApplicationBufferSize = applicationBufferSize();
appReadBuffer = Utils.ensureCapacity(appReadBuffer, currentApplicationBufferSize);
if (appReadBuffer.position() >= currentApplicationBufferSize) {
throw new IllegalStateException("Buffer overflow when available data size (" + appReadBuffer.position() +
") >= application buffer size (" + currentApplicationBufferSize + ")");
}
// appReadBuffer will extended upto currentApplicationBufferSize
// we need to read the existing content into dst before we can do unwrap again. If there are no space in dst
// we can break here.
if (dst.hasRemaining())
read += readFromAppBuffer(dst);
else
break;
} else if (unwrapResult.getStatus() == Status.BUFFER_UNDERFLOW) {
int currentNetReadBufferSize = netReadBufferSize();
netReadBuffer = Utils.ensureCapacity(netReadBuffer, currentNetReadBufferSize);
if (netReadBuffer.position() >= currentNetReadBufferSize) {
throw new IllegalStateException("Buffer underflow when available data size (" + netReadBuffer.position() +
") > packet buffer size (" + currentNetReadBufferSize + ")");
}
break;
} else if (unwrapResult.getStatus() == Status.CLOSED) {
// If data has been read and unwrapped, return the data. Close will be handled on the next poll.
if (appReadBuffer.position() == 0 && read == 0)
throw new EOFException();
else {
isClosed = true;
break;
}
}
}
if (read == 0 && netread < 0)
throw new EOFException("EOF during read");
if (netread <= 0 || isClosed)
break;
}
updateBytesBuffered(readFromNetwork || read > 0);
// If data has been read and unwrapped, return the data even if end-of-stream, channel will be closed
// on a subsequent poll.
return read;
}
/**
* Reads a sequence of bytes from this channel into the given buffers.
*
* @param dsts - The buffers into which bytes are to be transferred.
* @return The number of bytes read, possibly zero, or -1 if the channel has reached end-of-stream.
* @throws IOException if some other I/O error occurs
*/
@Override
public long read(ByteBuffer[] dsts) throws IOException {
return read(dsts, 0, dsts.length);
}
/**
* Reads a sequence of bytes from this channel into a subsequence of the given buffers.
* @param dsts - The buffers into which bytes are to be transferred
* @param offset - The offset within the buffer array of the first buffer into which bytes are to be transferred; must be non-negative and no larger than dsts.length.
* @param length - The maximum number of buffers to be accessed; must be non-negative and no larger than dsts.length - offset
* @return The number of bytes read, possibly zero, or -1 if the channel has reached end-of-stream.
* @throws IOException if some other I/O error occurs
*/
@Override
public long read(ByteBuffer[] dsts, int offset, int length) throws IOException {
if ((offset < 0) || (length < 0) || (offset > dsts.length - length))
throw new IndexOutOfBoundsException();
int totalRead = 0;
int i = offset;
while (i < length) {
if (dsts[i].hasRemaining()) {
int read = read(dsts[i]);
if (read > 0)
totalRead += read;
else
break;
}
if (!dsts[i].hasRemaining()) {
i++;
}
}
return totalRead;
}
/**
* Writes a sequence of bytes to this channel from the given buffer.
*
* @param src The buffer from which bytes are to be retrieved
* @return The number of bytes read from src, possibly zero, or -1 if the channel has reached end-of-stream
* @throws IOException If some other I/O error occurs
*/
@Override
public int write(ByteBuffer src) throws IOException {
if (state == State.CLOSING)
throw closingException();
if (!ready())
return 0;
int written = 0;
while (flush(netWriteBuffer) && src.hasRemaining()) {
netWriteBuffer.clear();
SSLEngineResult wrapResult = sslEngine.wrap(src, netWriteBuffer);
netWriteBuffer.flip();
// reject renegotiation if TLS < 1.3, key updates for TLS 1.3 are allowed
if (wrapResult.getHandshakeStatus() != HandshakeStatus.NOT_HANDSHAKING &&
wrapResult.getStatus() == Status.OK &&
!sslEngine.getSession().getProtocol().equals(TLS13)) {
throw renegotiationException();
}
if (wrapResult.getStatus() == Status.OK) {
written += wrapResult.bytesConsumed();
} else if (wrapResult.getStatus() == Status.BUFFER_OVERFLOW) {
// BUFFER_OVERFLOW means that the last `wrap` call had no effect, so we expand the buffer and try again
netWriteBuffer = Utils.ensureCapacity(netWriteBuffer, netWriteBufferSize());
netWriteBuffer.position(netWriteBuffer.limit());
} else if (wrapResult.getStatus() == Status.BUFFER_UNDERFLOW) {
throw new IllegalStateException("SSL BUFFER_UNDERFLOW during write");
} else if (wrapResult.getStatus() == Status.CLOSED) {
throw new EOFException();
}
}
return written;
}
/**
* Writes a sequence of bytes to this channel from the subsequence of the given buffers.
*
* @param srcs The buffers from which bytes are to be retrieved
* @param offset The offset within the buffer array of the first buffer from which bytes are to be retrieved; must be non-negative and no larger than srcs.length.
* @param length - The maximum number of buffers to be accessed; must be non-negative and no larger than srcs.length - offset.
* @return returns no.of bytes written , possibly zero.
* @throws IOException If some other I/O error occurs
*/
@Override
public long write(ByteBuffer[] srcs, int offset, int length) throws IOException {
if ((offset < 0) || (length < 0) || (offset > srcs.length - length))
throw new IndexOutOfBoundsException();
int totalWritten = 0;
int i = offset;
while (i < length) {
if (srcs[i].hasRemaining() || hasPendingWrites()) {
int written = write(srcs[i]);
if (written > 0) {
totalWritten += written;
}
}
if (!srcs[i].hasRemaining() && !hasPendingWrites()) {
i++;
} else {
// if we are unable to write the current buffer to socketChannel we should break,
// as we might have reached max socket send buffer size.
break;
}
}
return totalWritten;
}
/**
* Writes a sequence of bytes to this channel from the given buffers.
*
* @param srcs The buffers from which bytes are to be retrieved
* @return returns no.of bytes consumed by SSLEngine.wrap , possibly zero.
* @throws IOException If some other I/O error occurs
*/
@Override
public long write(ByteBuffer[] srcs) throws IOException {
return write(srcs, 0, srcs.length);
}
/**
* SSLSession's peerPrincipal for the remote host.
* @return Principal
*/
public Principal peerPrincipal() {
try {
return sslEngine.getSession().getPeerPrincipal();
} catch (SSLPeerUnverifiedException se) {
log.debug("SSL peer is not authenticated, returning ANONYMOUS instead");
return KafkaPrincipal.ANONYMOUS;
}
}
/**
* returns an SSL Session after the handshake is established
* throws IllegalStateException if the handshake is not established
*/
public SSLSession sslSession() throws IllegalStateException {
return sslEngine.getSession();
}
/**
* Adds interestOps to SelectionKey of the TransportLayer
* @param ops SelectionKey interestOps
*/
@Override
public void addInterestOps(int ops) {
if (!key.isValid())
throw new CancelledKeyException();
else if (!ready())
throw new IllegalStateException("handshake is not completed");
key.interestOps(key.interestOps() | ops);
}
/**
* removes interestOps to SelectionKey of the TransportLayer
* @param ops SelectionKey interestOps
*/
@Override
public void removeInterestOps(int ops) {
if (!key.isValid())
throw new CancelledKeyException();
else if (!ready())
throw new IllegalStateException("handshake is not completed");
key.interestOps(key.interestOps() & ~ops);
}
/**
* returns delegatedTask for the SSLEngine.
*/
protected Runnable delegatedTask() {
return sslEngine.getDelegatedTask();
}
/**
* transfers appReadBuffer contents (decrypted data) into dst bytebuffer
* @param dst ByteBuffer
*/
private int readFromAppBuffer(ByteBuffer dst) {
appReadBuffer.flip();
int remaining = Math.min(appReadBuffer.remaining(), dst.remaining());
if (remaining > 0) {
int limit = appReadBuffer.limit();
appReadBuffer.limit(appReadBuffer.position() + remaining);
dst.put(appReadBuffer);
appReadBuffer.limit(limit);
}
appReadBuffer.compact();
return remaining;
}
protected int netReadBufferSize() {
return sslEngine.getSession().getPacketBufferSize();
}
protected int netWriteBufferSize() {
return sslEngine.getSession().getPacketBufferSize();
}
protected int applicationBufferSize() {
return sslEngine.getSession().getApplicationBufferSize();
}
protected ByteBuffer netReadBuffer() {
return netReadBuffer;
}
// Visibility for testing
protected ByteBuffer appReadBuffer() {
return appReadBuffer;
}
/**
* SSL exceptions are propagated as authentication failures so that clients can avoid
* retries and report the failure. If `flush` is true, exceptions are propagated after
* any pending outgoing bytes are flushed to ensure that the peer is notified of the failure.
*/
private void handshakeFailure(SSLException sslException, boolean flush) throws IOException {
//Release all resources such as internal buffers that SSLEngine is managing
log.debug("SSL Handshake failed", sslException);
sslEngine.closeOutbound();
try {
sslEngine.closeInbound();
} catch (SSLException e) {
log.debug("SSLEngine.closeInBound() raised an exception.", e);
}
state = State.HANDSHAKE_FAILED;
handshakeException = new SslAuthenticationException("SSL handshake failed", sslException);
// Attempt to flush any outgoing bytes. If flush doesn't complete, delay exception handling until outgoing bytes
// are flushed. If write fails because remote end has closed the channel, log the I/O exception and continue to
// handle the handshake failure as an authentication exception.
if (!flush || handshakeWrapAfterFailure(flush))
throw handshakeException;
else
log.debug("Delay propagation of handshake exception till {} bytes remaining are flushed", netWriteBuffer.remaining());
}
// SSL handshake failures are typically thrown as SSLHandshakeException, SSLProtocolException,
// SSLPeerUnverifiedException or SSLKeyException if the cause is known. These exceptions indicate
// authentication failures (e.g. configuration errors) which should not be retried. But the SSL engine
// may also throw exceptions using the base class SSLException in a few cases:
// a) If there are no matching ciphers or TLS version or the private key is invalid, client will be
// unable to process the server message and an SSLException is thrown:
// javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
// b) If server closes the connection gracefully during handshake, client may receive close_notify
// and and an SSLException is thrown:
// javax.net.ssl.SSLException: Received close_notify during handshake
// We want to handle a) as a non-retriable SslAuthenticationException and b) as a retriable IOException.
// To do this we need to rely on the exception string. Since it is safer to throw a retriable exception
// when we are not sure, we will treat only the first exception string as a handshake exception.
private void maybeProcessHandshakeFailure(SSLException sslException, boolean flush, IOException ioException) throws IOException {
if (sslException instanceof SSLHandshakeException || sslException instanceof SSLProtocolException ||
sslException instanceof SSLPeerUnverifiedException || sslException instanceof SSLKeyException ||
sslException.getMessage().contains("Unrecognized SSL message") ||
sslException.getMessage().contains("Received fatal alert: "))
handshakeFailure(sslException, flush);
else if (ioException == null)
throw sslException;
else {
log.debug("SSLException while unwrapping data after IOException, original IOException will be propagated", sslException);
throw ioException;
}
}
// If handshake has already failed, throw the authentication exception.
private void maybeThrowSslAuthenticationException() {
if (handshakeException != null)
throw handshakeException;
}
/**
* Perform handshake wrap after an SSLException or any IOException.
*
* If `doWrite=false`, we are processing IOException after peer has disconnected, so we
* cannot send any more data. We perform any pending wraps so that we can unwrap any
* peer data that is already available.
*
* If `doWrite=true`, we are processing SSLException, we perform wrap and flush
* any data to notify the peer of the handshake failure.
*
* Returns true if no more wrap is required and any data is flushed or discarded.
*/
private boolean handshakeWrapAfterFailure(boolean doWrite) {
try {
log.trace("handshakeWrapAfterFailure status {} doWrite {}", handshakeStatus, doWrite);
while (handshakeStatus == HandshakeStatus.NEED_WRAP && (!doWrite || flush(netWriteBuffer))) {
if (!doWrite)
clearWriteBuffer();
handshakeWrap(doWrite);
}
} catch (Exception e) {
log.debug("Failed to wrap and flush all bytes before closing channel", e);
clearWriteBuffer();
}
if (!doWrite)
clearWriteBuffer();
return !netWriteBuffer.hasRemaining();
}
private void clearWriteBuffer() {
if (netWriteBuffer.hasRemaining())
log.debug("Discarding write buffer {} since peer has disconnected", netWriteBuffer);
netWriteBuffer.position(0);
netWriteBuffer.limit(0);
}
@Override
public boolean isMute() {
return key.isValid() && (key.interestOps() & SelectionKey.OP_READ) == 0;
}
@Override
public boolean hasBytesBuffered() {
return hasBytesBuffered;
}
// Update `hasBytesBuffered` status. If any bytes were read from the network or
// if data was returned from read, `hasBytesBuffered` is set to true if any buffered
// data is still remaining. If not, `hasBytesBuffered` is set to false since no progress
// can be made until more data is available to read from the network.
private void updateBytesBuffered(boolean madeProgress) {
if (madeProgress)
hasBytesBuffered = netReadBuffer.position() != 0 || appReadBuffer.position() != 0;
else
hasBytesBuffered = false;
}
@Override
public long transferFrom(FileChannel fileChannel, long position, long count) throws IOException {
if (state == State.CLOSING)
throw closingException();
if (state != State.READY)
return 0;
if (!flush(netWriteBuffer))
return 0;
long channelSize = fileChannel.size();
if (position > channelSize)
return 0;
int totalBytesToWrite = (int) Math.min(Math.min(count, channelSize - position), Integer.MAX_VALUE);
if (fileChannelBuffer == null) {
// Pick a size that allows for reasonably efficient disk reads, keeps the memory overhead per connection
// manageable and can typically be drained in a single `write` call. The `netWriteBuffer` is typically 16k
// and the socket send buffer is 100k by default, so 32k is a good number given the mentioned trade-offs.
int transferSize = 32768;
// Allocate a direct buffer to avoid one heap to heap buffer copy. SSLEngine copies the source
// buffer (fileChannelBuffer) to the destination buffer (netWriteBuffer) and then encrypts in-place.
// FileChannel.read() to a heap buffer requires a copy from a direct buffer to a heap buffer, which is not
// useful here.
fileChannelBuffer = ByteBuffer.allocateDirect(transferSize);
// The loop below drains any remaining bytes from the buffer before reading from disk, so we ensure there
// are no remaining bytes in the empty buffer
fileChannelBuffer.position(fileChannelBuffer.limit());
}
int totalBytesWritten = 0;
long pos = position;
try {
while (totalBytesWritten < totalBytesToWrite) {
if (!fileChannelBuffer.hasRemaining()) {
fileChannelBuffer.clear();
int bytesRemaining = totalBytesToWrite - totalBytesWritten;
if (bytesRemaining < fileChannelBuffer.limit())
fileChannelBuffer.limit(bytesRemaining);
int bytesRead = fileChannel.read(fileChannelBuffer, pos);
if (bytesRead <= 0)
break;
fileChannelBuffer.flip();
}
int networkBytesWritten = write(fileChannelBuffer);
totalBytesWritten += networkBytesWritten;
// In the case of a partial write we only return the written bytes to the caller. As a result, the
// `position` passed in the next `transferFrom` call won't include the bytes remaining in
// `fileChannelBuffer`. By draining `fileChannelBuffer` first, we ensure we update `pos` before
// we invoke `fileChannel.read`.
if (fileChannelBuffer.hasRemaining())
break;
pos += networkBytesWritten;
}
return totalBytesWritten;
} catch (IOException e) {
if (totalBytesWritten > 0)
return totalBytesWritten;
throw e;
}
}
}
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