Netty客户端在需要相互身份验证的SSL握手期间不发送客户端证书

Question

我是Netty的新手，我尝试编写一个使用相互身份验证的echo服务器和客户端。不幸的是，它无法工作，客户端没有发送其客户端证书，服务器按预期断开连接。下面是我到目前为止所做的工作和客户端代码的概述--它可能包含一些bug或者我错过了一些重要的东西。谢谢你经历了这一切！

这就是我所拥有的：

• Netty版本4.1.0.cr1
• 可在服务器上下载的有效密钥存储库、信任存储库和CRL
• 直接使用JSSE的echo服务器和客户端的完整实现（按预期工作）
• 使用Netty的echo服务器的工作实现（与基于JSSE的客户机一起使用时效果很好）
• 基于Netty的不发送客户端证书的客户端

通道处理程序：

package info.junius.tutorial.echo.netty.tls;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.util.CharsetUtil;

public class EchoClientHandler extends SimpleChannelInboundHandler<ByteBuf>
{
    @Override
    public void channelRead0(ChannelHandlerContext ctx, ByteBuf in)
    {
        System.out.println("CLIENT: Received echo from server:\n" + in.toString(CharsetUtil.UTF_8));
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
    {
        cause.printStackTrace();
        ctx.close();
    }
}

通道初始化程序：

package info.junius.tutorial.echo.netty.tls;

import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.handler.ssl.SslContext;

public class ClientChannelInitializer extends ChannelInitializer<Channel>
{
    private final SslContext context;
    private final String peerHost;
    private final int peerPort;

    public ClientChannelInitializer(SslContext context, String peerHost, int peerPort)
    {
        this.context = context;
        this.peerHost = peerHost;
        this.peerPort = peerPort;
    }

    @Override
    protected void initChannel(Channel channel) throws Exception
    {
        // Add SSL handler first to encrypt and decrypt everything.
        channel.pipeline().addLast(this.context.newHandler(channel.alloc(), this.peerHost, this.peerPort));
        // and then business logic.
        channel.pipeline().addLast(new EchoClientHandler());
    }
}

echo客户端：

package info.junius.tutorial.echo.netty.tls;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;

public class EchoClient
{
    private final String host;
    private final int port;

    public EchoClient(String host, int port)
    {
        super();
        this.host = host;
        this.port = port;
    }

    public static void main(String[] args) throws Exception
    {
        if (args.length != 2)
        {
            System.err.println("Usage: " + EchoClient.class.getSimpleName() + " <host> <port>");
        }
        else
        {
            // Security.addProvider(new BouncyCastleProvider());
            String host = args[0];
            int port = Integer.parseInt(args[1]);
            new EchoClient(host, port).start();
        }
    }

    public void start() throws Exception
    {
        TlsContextUtil tlsContextUtil = new TlsContextUtil();
        ChannelInitializer<Channel> channelInitializer = new ClientChannelInitializer(tlsContextUtil.getClientContext(), this.host, this.port);
        EventLoopGroup group = new NioEventLoopGroup();
        try
        {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class).handler(channelInitializer);
            Channel channel = b.connect(this.host, this.port).sync().channel();
            ChannelFuture writeFuture = channel.writeAndFlush("Hello from netty client!\n");
            // channel.closeFuture().sync();
            writeFuture.sync();
        }
        finally
        {
            group.shutdownGracefully().sync();
        }
    }
}

和返回SSLContext的实用工具类：

...
public SslContext getClientContext() throws IOException
    {
        SslContext sslContext = null;
        try
        {
            // truststore
            TrustManagerFactory tmf = TrustManagerFactory.getInstance("PKIX", "SunJSSE");
            tmf.init(this.getKeystore(TRUSTSTORE));

            // keystore holding client certificate
            KeyManagerFactory kmf = KeyManagerFactory.getInstance("PKIX", "SunJSSE");
            kmf.init(this.getKeystore(CLIENT_KEYSTORE), KEYSTORE_PW);

            SslContextBuilder builder = SslContextBuilder.forClient().keyManager(kmf).trustManager(tmf).ciphers(PFS_CIPHERS);

            // build context
            sslContext = builder.build();
        }
        catch (NoSuchAlgorithmException
               | NoSuchProviderException
               | KeyStoreException
               | IllegalStateException
               | UnrecoverableKeyException e)
        {
            throw new IOException("Unable to create client TLS context", e);
        }
        return sslContext;
    }
...

-Djavax.net.debug=all -Djava.security.debug="certpath crl" -Dcom.sun.net.ssl.checkRevocation=true -Dcom.sun.security.enableCRLDP=true

Answer 1

好吧，我已经开始工作了。实际上是我的客户机代码错了（该代码基于Netty附带的安全聊天示例）。所以我把它改成了echo示例中使用的版本：

EchoClientHandler：

@Override
public void channelActive(ChannelHandlerContext ctx)
{
    // When notified that the channel is active send a message.
    System.out.println("CLIENT: Sending request to server...");
    ctx.writeAndFlush(Unpooled.copiedBuffer("Mein Schnitzel ist kaputt!\n", CharsetUtil.UTF_8));
}   

和EchoClient：

try
{
    Bootstrap b = new Bootstrap();
    b.group(group).channel(NioSocketChannel.class).handler(channelInitializer);
    ChannelFuture f = b.connect(this.host, this.port).sync();
    f.channel().closeFuture().sync();
}
finally
{
    group.shutdownGracefully().sync();
}