NotSslRecordException exception thrown with Netty proxy server

Question

I am connecting my local netty server to a remote https server for proxying requests.

public class CustomInitializer extends ChannelInitializer<SocketChannel> {

    @Autowired(required = false)
    private SslContext sslContext;


    @Override
    public void initChannel(SocketChannel ch) {
        ChannelPipeline p = ch.pipeline();
        if (sslContext != null) {
            p.addLast(sslContext.newHandler(ch.alloc()));
        }
        p.addLast(new LoggingHandler(LogLevel.INFO));
        p.addLast(new HttpClientCodec());
        p.addLast(new HttpObjectAggregator(8*1024, true));
        p.addLast(new MyCustomHandler());
    }
}

Here is how I create ssLcontext bean

@Bean
    public SslContext sslContext(@Value("${tcp.ssl}") boolean ssl) throws SSLException, CertificateException {
        SslContext sslContext = null;
        if (ssl) {
            SelfSignedCertificate ssc = new SelfSignedCertificate();
            sslContext = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
        }
        return sslContext;
    }

When I hit my localhost, it should proxy to backend. I get the following exception. However, if SSL is turned off and I connect to remote which is local server running on different port, it works fine

io.netty.handler.codec.DecoderException: io.netty.handler.ssl.NotSslRecordException: not an SSL/TLS record: dsffddfs
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:459)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:547)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:501)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:834)
io.netty.handler.ssl.NotSslRecordException: not an SSL/TLS record: thjhjhhj     at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1178)
    at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1243)
    at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489)
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:547)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:501)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:834)
io.netty.handler.codec.DecoderException: io.netty.handler.ssl.NotSslRecordException: not an SSL/TLS record: tyuuiiio
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:459)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:547)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:501)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: io.netty.handler.ssl.NotSslRecordException: not an SSL/TLS record: 678900
    at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1178)
    at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1243)
    at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489)
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428)
    ... 16 more

EDIT

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Ferrybig · Accepted Answer · 2019-04-23 17:10:46Z

24

When you receive an NotSslRecordException exception, you best starting point is the random blob of bytes following the error.

Your "blob" starts with the following bytes: 504f5354...

After converting the hex data back to a String, you get 50 = P, 4f = O, 53 = S, 54 = T, final result: POST

Since we now converted the start of the binary blob to a String, we now need to figure out what protocols use these "magic strings". We don't have to look far for it, this is a HTTP Request, and you cannot use HTTPS to receive it.

The solution is simple, connect to your server using https instead of http:

https://localhost:8080/

answered Apr 23, 2019 at 17:10

Ferrybig

18.6k6 gold badges59 silver badges82 bronze badges

I get this in the log. USER_EVENT: SslHandshakeCompletionEvent(javax.net.ssl.SSLException: handshake timed out) and the request drops off
– brain storm
Commented Apr 23, 2019 at 17:16
@brainstorm Place you logging handler before the ssl handler, and see if the server actually responds back to the client
– Ferrybig
Commented Apr 23, 2019 at 17:19
I moved the logger, now I don't see handshake error but response is cut off still. I added logs to the post above
– brain storm
Commented Apr 23, 2019 at 17:40
I kept debugger and found out that it is still handshake error, backEndHandler#ChannelRead is never invoked. I see error at operationComplete inside frontEndHandler.
– brain storm
Commented Apr 23, 2019 at 18:06
Basically one is using plaintext encryption method and another is using TLS/SSL encryption. This is the reason for this Exception.
– Daniel Paul
Commented Feb 28, 2022 at 18:21

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