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/**
* Copyright 2007-2015, Kaazing Corporation. All rights reserved.
*
* Licensed 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.mina.filter.ssl;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLHandshakeException;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.filterchain.IoFilterEvent;
import org.apache.mina.core.filterchain.IoFilter.NextFilter;
import org.apache.mina.core.future.DefaultWriteFuture;
import org.apache.mina.core.future.WriteFuture;
import org.apache.mina.core.session.IoEventType;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.core.write.DefaultWriteRequest;
import org.apache.mina.core.write.WriteRequest;
import org.apache.mina.util.CircularQueue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A helper class using the SSLEngine API to decrypt/encrypt data.
*
* Each connection has a SSLEngine that is used through the lifetime of the connection.
* We allocate buffers for use as the outbound and inbound network buffers.
* These buffers handle all of the intermediary data for the SSL connection. To make things easy,
* we'll require outNetBuffer be completely flushed before trying to wrap any more data.
*
* @author Apache MINA Project
*/
class SslHandler {
private final static Logger LOGGER = LoggerFactory.getLogger(SslHandler.class);
private final SslFilter parent;
private final SSLContext sslContext;
private final IoSession session;
private final Queue preHandshakeEventQueue = new CircularQueue();
private final Queue filterWriteEventQueue = new ConcurrentLinkedQueue();
private final Queue messageReceivedEventQueue = new ConcurrentLinkedQueue();
private SSLEngine sslEngine;
/**
* Encrypted data from the net
*/
private IoBuffer inNetBuffer;
/**
* Encrypted data to be written to the net
*/
private IoBuffer outNetBuffer;
/**
* Applicaton cleartext data to be read by application
*/
private IoBuffer appBuffer;
/**
* Empty buffer used during initial handshake and close operations
*/
private final IoBuffer emptyBuffer = IoBuffer.allocate(0);
private SSLEngineResult.HandshakeStatus handshakeStatus;
private boolean initialHandshakeComplete;
private boolean handshakeComplete;
private boolean writingEncryptedData;
/**
* Constuctor.
*
* @param sslc
* @throws SSLException
*/
public SslHandler(SslFilter parent, SSLContext sslContext, IoSession session)
throws SSLException {
this.parent = parent;
this.session = session;
this.sslContext = sslContext;
init();
}
/**
* Initialize the SSL handshake.
*
* @throws SSLException
*/
public void init() throws SSLException {
if (sslEngine != null) {
// We already have a SSL engine created, no need to create a new one
return;
}
InetSocketAddress peer = (InetSocketAddress) session
.getAttribute(SslFilter.PEER_ADDRESS);
// Create the SSL engine here
if (peer == null) {
sslEngine = sslContext.createSSLEngine();
} else {
sslEngine = sslContext.createSSLEngine(peer.getHostName(), peer.getPort());
}
// Initialize the engine in client mode if necessary
sslEngine.setUseClientMode(parent.isUseClientMode());
// Initialize the different SslEngine modes
if (parent.isWantClientAuth()) {
sslEngine.setWantClientAuth(true);
}
if (parent.isNeedClientAuth()) {
sslEngine.setNeedClientAuth(true);
}
if (parent.getEnabledCipherSuites() != null) {
sslEngine.setEnabledCipherSuites(parent.getEnabledCipherSuites());
}
if (parent.getEnabledProtocols() != null) {
sslEngine.setEnabledProtocols(parent.getEnabledProtocols());
}
// TODO : we may not need to call this method...
sslEngine.beginHandshake();
handshakeStatus = sslEngine.getHandshakeStatus();
handshakeComplete = false;
initialHandshakeComplete = false;
writingEncryptedData = false;
}
/**
* Release allocated buffers.
*/
public void destroy() {
if (sslEngine == null) {
return;
}
// Close inbound and flush all remaining data if available.
try {
sslEngine.closeInbound();
} catch (SSLException e) {
LOGGER.debug(
"Unexpected exception from SSLEngine.closeInbound().", e);
}
if (outNetBuffer != null) {
outNetBuffer.capacity(sslEngine.getSession().getPacketBufferSize());
} else {
createOutNetBuffer(0);
}
try {
do {
outNetBuffer.clear();
} while (sslEngine.wrap(emptyBuffer.buf(), outNetBuffer.buf()).bytesProduced() > 0);
} catch (SSLException e) {
// Ignore.
} finally {
destroyOutNetBuffer();
}
sslEngine.closeOutbound();
sslEngine = null;
preHandshakeEventQueue.clear();
}
private void destroyOutNetBuffer() {
outNetBuffer.free();
outNetBuffer = null;
}
public SslFilter getParent() {
return parent;
}
public IoSession getSession() {
return session;
}
/**
* Check we are writing encrypted data.
*/
public boolean isWritingEncryptedData() {
return writingEncryptedData;
}
/**
* Check if handshake is completed.
*/
public boolean isHandshakeComplete() {
return handshakeComplete;
}
public boolean isInboundDone() {
return sslEngine == null || sslEngine.isInboundDone();
}
public boolean isOutboundDone() {
return sslEngine == null || sslEngine.isOutboundDone();
}
/**
* Check if there is any need to complete handshake.
*/
public boolean needToCompleteHandshake() {
return handshakeStatus == SSLEngineResult.HandshakeStatus.NEED_WRAP && !isInboundDone();
}
public void schedulePreHandshakeWriteRequest(NextFilter nextFilter,
WriteRequest writeRequest) {
preHandshakeEventQueue.add(new IoFilterEvent(nextFilter,
IoEventType.WRITE, session, writeRequest));
}
public void flushPreHandshakeEvents() throws SSLException {
IoFilterEvent scheduledWrite;
while ((scheduledWrite = preHandshakeEventQueue.poll()) != null) {
parent.filterWrite(scheduledWrite.getNextFilter(), session,
(WriteRequest) scheduledWrite.getParameter());
}
}
public void scheduleFilterWrite(NextFilter nextFilter, WriteRequest writeRequest) {
filterWriteEventQueue.add(new IoFilterEvent(nextFilter, IoEventType.WRITE, session, writeRequest));
}
public void scheduleMessageReceived(NextFilter nextFilter, Object message) {
messageReceivedEventQueue.add(new IoFilterEvent(nextFilter, IoEventType.MESSAGE_RECEIVED, session, message));
}
public void flushScheduledEvents() {
// Fire events only when no lock is hold for this handler.
if (Thread.holdsLock(this)) {
return;
}
IoFilterEvent e;
// We need synchronization here inevitably because filterWrite can be
// called simultaneously and cause 'bad record MAC' integrity error.
synchronized (this) {
while ((e = filterWriteEventQueue.poll()) != null) {
e.getNextFilter().filterWrite(session, (WriteRequest) e.getParameter());
}
}
while ((e = messageReceivedEventQueue.poll()) != null) {
e.getNextFilter().messageReceived(session, e.getParameter());
}
}
/**
* Call when data read from net. Will perform inial hanshake or decrypt provided
* Buffer.
* Decrytpted data reurned by getAppBuffer(), if any.
*
* @param buf buffer to decrypt
* @param nextFilter Next filter in chain
* @throws SSLException on errors
*/
public void messageReceived(NextFilter nextFilter, ByteBuffer buf) throws SSLException {
// append buf to inNetBuffer
if (inNetBuffer == null) {
inNetBuffer = IoBuffer.allocate(buf.remaining()).setAutoExpand(true);
}
inNetBuffer.put(buf);
if (!handshakeComplete) {
handshake(nextFilter);
} else {
decrypt(nextFilter);
}
if (isInboundDone()) {
// Rewind the MINA buffer if not all data is processed and inbound is finished.
int inNetBufferPosition = inNetBuffer == null? 0 : inNetBuffer.position();
buf.position(buf.position() - inNetBufferPosition);
inNetBuffer = null;
}
}
/**
* Get decrypted application data.
*
* @return buffer with data
*/
public IoBuffer fetchAppBuffer() {
IoBuffer appBuffer = this.appBuffer.flip();
this.appBuffer = null;
return appBuffer;
}
/**
* Get encrypted data to be sent.
*
* @return buffer with data
*/
public IoBuffer fetchOutNetBuffer() {
IoBuffer answer = outNetBuffer;
if (answer == null) {
return emptyBuffer;
}
outNetBuffer = null;
return answer.shrink();
}
/**
* Encrypt provided buffer. Encrypted data returned by getOutNetBuffer().
*
* @param src data to encrypt
* @throws SSLException on errors
*/
public void encrypt(ByteBuffer src) throws SSLException {
if (!handshakeComplete) {
throw new IllegalStateException();
}
if (!src.hasRemaining()) {
if (outNetBuffer == null) {
outNetBuffer = emptyBuffer;
}
return;
}
createOutNetBuffer(src.remaining());
// Loop until there is no more data in src
while (src.hasRemaining()) {
SSLEngineResult result = sslEngine.wrap(src, outNetBuffer.buf());
if (result.getStatus() == SSLEngineResult.Status.OK) {
if (result.getHandshakeStatus() == SSLEngineResult.HandshakeStatus.NEED_TASK) {
doTasks();
}
} else if (result.getStatus() == SSLEngineResult.Status.BUFFER_OVERFLOW) {
outNetBuffer.capacity(outNetBuffer.capacity() << 1);
outNetBuffer.limit(outNetBuffer.capacity());
} else {
throw new SSLException("SSLEngine error during encrypt: "
+ result.getStatus() + " src: " + src
+ "outNetBuffer: " + outNetBuffer);
}
}
outNetBuffer.flip();
}
/**
* Start SSL shutdown process.
*
* @return true if shutdown process is started.
* false if shutdown process is already finished.
* @throws SSLException on errors
*/
public boolean closeOutbound() throws SSLException {
if (sslEngine == null || sslEngine.isOutboundDone()) {
return false;
}
sslEngine.closeOutbound();
createOutNetBuffer(0);
SSLEngineResult result;
for (;;) {
result = sslEngine.wrap(emptyBuffer.buf(), outNetBuffer.buf());
if (result.getStatus() == SSLEngineResult.Status.BUFFER_OVERFLOW) {
outNetBuffer.capacity(outNetBuffer.capacity() << 1);
outNetBuffer.limit(outNetBuffer.capacity());
} else {
break;
}
}
if (result.getStatus() != SSLEngineResult.Status.CLOSED) {
throw new SSLException("Improper close state: " + result);
}
outNetBuffer.flip();
return true;
}
/**
* Decrypt in net buffer. Result is stored in app buffer.
*
* @throws SSLException
*/
private void decrypt(NextFilter nextFilter) throws SSLException {
if (!handshakeComplete) {
throw new IllegalStateException();
}
unwrap(nextFilter);
}
/**
* @param res
* @throws SSLException
*/
private void checkStatus(SSLEngineResult res)
throws SSLException {
SSLEngineResult.Status status = res.getStatus();
/*
* The status may be:
* OK - Normal operation
* OVERFLOW - Should never happen since the application buffer is
* sized to hold the maximum packet size.
* UNDERFLOW - Need to read more data from the socket. It's normal.
* CLOSED - The other peer closed the socket. Also normal.
*/
if (status != SSLEngineResult.Status.OK
&& status != SSLEngineResult.Status.CLOSED
&& status != SSLEngineResult.Status.BUFFER_UNDERFLOW) {
throw new SSLException("SSLEngine error during decrypt: " + status
+ " inNetBuffer: " + inNetBuffer + "appBuffer: "
+ appBuffer);
}
}
/**
* Perform any handshaking processing.
*/
public void handshake(NextFilter nextFilter) throws SSLException {
for (;;) {
switch (handshakeStatus) {
case FINISHED :
session.setAttribute(
SslFilter.SSL_SESSION, sslEngine.getSession());
handshakeComplete = true;
if (!initialHandshakeComplete
&& session.containsAttribute(SslFilter.USE_NOTIFICATION)) {
// SESSION_SECURED is fired only when it's the first handshake.
// (i.e. renegotiation shouldn't trigger SESSION_SECURED.)
initialHandshakeComplete = true;
scheduleMessageReceived(nextFilter,
SslFilter.SESSION_SECURED);
}
return;
case NEED_TASK :
handshakeStatus = doTasks();
break;
case NEED_UNWRAP :
// we need more data read
SSLEngineResult.Status status = unwrapHandshake(nextFilter);
if (status == SSLEngineResult.Status.BUFFER_UNDERFLOW &&
handshakeStatus != SSLEngineResult.HandshakeStatus.FINISHED ||
isInboundDone()) {
// We need more data or the session is closed
return;
}
break;
case NEED_WRAP :
// First make sure that the out buffer is completely empty. Since we
// cannot call wrap with data left on the buffer
if (outNetBuffer != null && outNetBuffer.hasRemaining()) {
return;
}
SSLEngineResult result;
createOutNetBuffer(0);
for (;;) {
result = sslEngine.wrap(emptyBuffer.buf(), outNetBuffer.buf());
if (result.getStatus() == SSLEngineResult.Status.BUFFER_OVERFLOW) {
outNetBuffer.capacity(outNetBuffer.capacity() << 1);
outNetBuffer.limit(outNetBuffer.capacity());
} else {
break;
}
}
outNetBuffer.flip();
handshakeStatus = result.getHandshakeStatus();
writeNetBuffer(nextFilter);
break;
default :
throw new IllegalStateException("Invalid Handshaking State"
+ handshakeStatus);
}
}
}
private void createOutNetBuffer(int expectedRemaining) {
// SSLEngine requires us to allocate unnecessarily big buffer
// even for small data. *Shrug*
int capacity = Math.max(
expectedRemaining,
sslEngine.getSession().getPacketBufferSize());
if (outNetBuffer != null) {
outNetBuffer.capacity(capacity);
} else {
outNetBuffer = IoBuffer.allocate(capacity).minimumCapacity(0);
}
}
public WriteFuture writeNetBuffer(NextFilter nextFilter)
throws SSLException {
// Check if any net data needed to be writen
if (outNetBuffer == null || !outNetBuffer.hasRemaining()) {
// no; bail out
return null;
}
// set flag that we are writing encrypted data
// (used in SSLFilter.filterWrite())
writingEncryptedData = true;
// write net data
WriteFuture writeFuture = null;
try {
IoBuffer writeBuffer = fetchOutNetBuffer();
writeFuture = new DefaultWriteFuture(session);
parent.filterWrite(nextFilter, session, new DefaultWriteRequest(
writeBuffer, writeFuture));
// loop while more writes required to complete handshake
while (needToCompleteHandshake()) {
try {
handshake(nextFilter);
} catch (SSLException ssle) {
SSLException newSsle = new SSLHandshakeException(
"SSL handshake failed.");
newSsle.initCause(ssle);
throw newSsle;
}
IoBuffer outNetBuffer = fetchOutNetBuffer();
if (outNetBuffer != null && outNetBuffer.hasRemaining()) {
writeFuture = new DefaultWriteFuture(session);
parent.filterWrite(nextFilter, session,
new DefaultWriteRequest(outNetBuffer, writeFuture));
}
}
} finally {
writingEncryptedData = false;
}
return writeFuture;
}
private void unwrap(NextFilter nextFilter) throws SSLException {
// Prepare the net data for reading.
if (inNetBuffer != null) {
inNetBuffer.flip();
}
if (inNetBuffer == null || !inNetBuffer.hasRemaining()) {
return;
}
SSLEngineResult res = unwrap0();
// prepare to be written again
if (inNetBuffer.hasRemaining()) {
inNetBuffer.compact();
} else {
inNetBuffer = null;
}
checkStatus(res);
renegotiateIfNeeded(nextFilter, res);
}
private SSLEngineResult.Status unwrapHandshake(NextFilter nextFilter) throws SSLException {
// Prepare the net data for reading.
if (inNetBuffer != null) {
inNetBuffer.flip();
}
if (inNetBuffer == null || !inNetBuffer.hasRemaining()) {
// Need more data.
return SSLEngineResult.Status.BUFFER_UNDERFLOW;
}
SSLEngineResult res = unwrap0();
handshakeStatus = res.getHandshakeStatus();
checkStatus(res);
// If handshake finished, no data was produced, and the status is still ok,
// try to unwrap more
if (handshakeStatus == SSLEngineResult.HandshakeStatus.FINISHED
&& res.getStatus() == SSLEngineResult.Status.OK
&& inNetBuffer.hasRemaining()) {
res = unwrap0();
// prepare to be written again
if (inNetBuffer.hasRemaining()) {
inNetBuffer.compact();
} else {
inNetBuffer = null;
}
renegotiateIfNeeded(nextFilter, res);
} else {
// prepare to be written again
if (inNetBuffer.hasRemaining()) {
inNetBuffer.compact();
} else {
inNetBuffer = null;
}
}
return res.getStatus();
}
private void renegotiateIfNeeded(NextFilter nextFilter, SSLEngineResult res)
throws SSLException {
if (res.getStatus() != SSLEngineResult.Status.CLOSED
&& res.getStatus() != SSLEngineResult.Status.BUFFER_UNDERFLOW
&& res.getHandshakeStatus() != SSLEngineResult.HandshakeStatus.NOT_HANDSHAKING) {
// Renegotiation required.
handshakeComplete = false;
handshakeStatus = res.getHandshakeStatus();
handshake(nextFilter);
}
}
private SSLEngineResult unwrap0() throws SSLException {
if (appBuffer == null) {
appBuffer = IoBuffer.allocate(inNetBuffer.remaining());
} else {
appBuffer.expand(inNetBuffer.remaining());
}
SSLEngineResult res;
do {
res = sslEngine.unwrap(inNetBuffer.buf(), appBuffer.buf());
if (res.getStatus() == SSLEngineResult.Status.BUFFER_OVERFLOW) {
appBuffer.capacity(appBuffer.capacity() << 1);
appBuffer.limit(appBuffer.capacity());
continue;
}
} while ((res.getStatus() == SSLEngineResult.Status.OK || res.getStatus() == SSLEngineResult.Status.BUFFER_OVERFLOW) &&
(handshakeComplete && res.getHandshakeStatus() == SSLEngineResult.HandshakeStatus.NOT_HANDSHAKING ||
res.getHandshakeStatus() == SSLEngineResult.HandshakeStatus.NEED_UNWRAP));
return res;
}
/**
* Do all the outstanding handshake tasks in the current Thread.
*/
private SSLEngineResult.HandshakeStatus doTasks() {
/*
* We could run this in a separate thread, but I don't see the need
* for this when used from SSLFilter. Use thread filters in MINA instead?
*/
Runnable runnable;
while ((runnable = sslEngine.getDelegatedTask()) != null) {
// TODO : we may have to use a thread pool here to improve the performances
runnable.run();
}
return sslEngine.getHandshakeStatus();
}
/**
* Creates a new MINA buffer that is a deep copy of the remaining bytes
* in the given buffer (between index buf.position() and buf.limit())
*
* @param src the buffer to copy
* @return the new buffer, ready to read from
*/
public static IoBuffer copy(ByteBuffer src) {
IoBuffer copy = IoBuffer.allocate(src.remaining());
copy.put(src);
copy.flip();
return copy;
}
}
