io.netty.handler.ssl.ApplicationProtocolNegotiationHandler Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* Copyright 2015 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.handler.ssl;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.ChannelInputShutdownEvent;
import io.netty.handler.codec.DecoderException;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.RecyclableArrayList;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import javax.net.ssl.SSLException;
/**
* Configures a {@link ChannelPipeline} depending on the application-level protocol negotiation result of
* {@link SslHandler}. For example, you could configure your HTTP pipeline depending on the result of ALPN:
*
* public class MyInitializer extends {@link ChannelInitializer}<{@link Channel}> {
* private final {@link SslContext} sslCtx;
*
* public MyInitializer({@link SslContext} sslCtx) {
* this.sslCtx = sslCtx;
* }
*
* protected void initChannel({@link Channel} ch) {
* {@link ChannelPipeline} p = ch.pipeline();
* p.addLast(sslCtx.newHandler(...)); // Adds {@link SslHandler}
* p.addLast(new MyNegotiationHandler());
* }
* }
*
* public class MyNegotiationHandler extends {@link ApplicationProtocolNegotiationHandler} {
* public MyNegotiationHandler() {
* super({@link ApplicationProtocolNames}.HTTP_1_1);
* }
*
* protected void configurePipeline({@link ChannelHandlerContext} ctx, String protocol) {
* if ({@link ApplicationProtocolNames}.HTTP_2.equals(protocol) {
* configureHttp2(ctx);
* } else if ({@link ApplicationProtocolNames}.HTTP_1_1.equals(protocol)) {
* configureHttp1(ctx);
* } else {
* throw new IllegalStateException("unknown protocol: " + protocol);
* }
* }
* }
*
*/
public abstract class ApplicationProtocolNegotiationHandler extends ChannelInboundHandlerAdapter {
private static final InternalLogger logger =
InternalLoggerFactory.getInstance(ApplicationProtocolNegotiationHandler.class);
private final String fallbackProtocol;
private final RecyclableArrayList bufferedMessages = RecyclableArrayList.newInstance();
private ChannelHandlerContext ctx;
private boolean sslHandlerChecked;
/**
* Creates a new instance with the specified fallback protocol name.
*
* @param fallbackProtocol the name of the protocol to use when
* ALPN/NPN negotiation fails or the client does not support ALPN/NPN
*/
protected ApplicationProtocolNegotiationHandler(String fallbackProtocol) {
this.fallbackProtocol = ObjectUtil.checkNotNull(fallbackProtocol, "fallbackProtocol");
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
this.ctx = ctx;
super.handlerAdded(ctx);
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
fireBufferedMessages();
bufferedMessages.recycle();
super.handlerRemoved(ctx);
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
// Let's buffer all data until this handler will be removed from the pipeline.
bufferedMessages.add(msg);
if (!sslHandlerChecked) {
sslHandlerChecked = true;
if (ctx.pipeline().get(SslHandler.class) == null) {
// Just remove ourself if there is no SslHandler in the pipeline and so we would otherwise
// buffer forever.
removeSelfIfPresent(ctx);
}
}
}
/**
* Process all backlog into pipeline from List.
*/
private void fireBufferedMessages() {
if (!bufferedMessages.isEmpty()) {
for (int i = 0; i < bufferedMessages.size(); i++) {
ctx.fireChannelRead(bufferedMessages.get(i));
}
ctx.fireChannelReadComplete();
bufferedMessages.clear();
}
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
if (evt instanceof SslHandshakeCompletionEvent) {
SslHandshakeCompletionEvent handshakeEvent = (SslHandshakeCompletionEvent) evt;
try {
if (handshakeEvent.isSuccess()) {
SslHandler sslHandler = ctx.pipeline().get(SslHandler.class);
if (sslHandler == null) {
throw new IllegalStateException("cannot find an SslHandler in the pipeline (required for "
+ "application-level protocol negotiation)");
}
String protocol = sslHandler.applicationProtocol();
configurePipeline(ctx, protocol != null ? protocol : fallbackProtocol);
} else {
// if the event is not produced because of an successful handshake we will receive the same
// exception in exceptionCaught(...) and handle it there. This will allow us more fine-grained
// control over which exception we propagate down the ChannelPipeline.
//
// See https://github.com/netty/netty/issues/10342
}
} catch (Throwable cause) {
exceptionCaught(ctx, cause);
} finally {
// Handshake failures are handled in exceptionCaught(...).
if (handshakeEvent.isSuccess()) {
removeSelfIfPresent(ctx);
}
}
}
if (evt instanceof ChannelInputShutdownEvent) {
fireBufferedMessages();
}
ctx.fireUserEventTriggered(evt);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
fireBufferedMessages();
super.channelInactive(ctx);
}
private void removeSelfIfPresent(ChannelHandlerContext ctx) {
ChannelPipeline pipeline = ctx.pipeline();
if (!ctx.isRemoved()) {
pipeline.remove(this);
}
}
/**
* Invoked on successful initial SSL/TLS handshake. Implement this method to configure your pipeline
* for the negotiated application-level protocol.
*
* @param protocol the name of the negotiated application-level protocol, or
* the fallback protocol name specified in the constructor call if negotiation failed or the client
* isn't aware of ALPN/NPN extension
*/
protected abstract void configurePipeline(ChannelHandlerContext ctx, String protocol) throws Exception;
/**
* Invoked on failed initial SSL/TLS handshake.
*/
protected void handshakeFailure(ChannelHandlerContext ctx, Throwable cause) throws Exception {
logger.warn("{} TLS handshake failed:", ctx.channel(), cause);
ctx.close();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
Throwable wrapped;
if (cause instanceof DecoderException && ((wrapped = cause.getCause()) instanceof SSLException)) {
try {
handshakeFailure(ctx, wrapped);
return;
} finally {
removeSelfIfPresent(ctx);
}
}
logger.warn("{} Failed to select the application-level protocol:", ctx.channel(), cause);
ctx.fireExceptionCaught(cause);
ctx.close();
}
}