I need to set up a really lightweight HTTPS server for a Java application. It's a simulator that's being used in our development labs to simulate the HTTPS connections accepted by a piece of equipment in the wild. Because it's purely a lightweight development tool and isn't used in production in any way at all, I'm quite happy to bypass certifications and as much negotiation as I can.

I'm planning on using the HttpsServer class in Java 6 SE but I'm struggling to get it working. As a test client, I'm using wget from the cygwin command line (wget https://[address]:[port]) but wget reports that it was "Unable to establish SSL connection".

If I run wget with the -d opti开发者_如何学运维on for debugging it tells me "SSL handshake failed".

I've spent 30 minutes googling this and everything seems to just point back to the fairly useless Java 6 documentation that describes the methods but doesn't actually talk about how to get the darn thing talking or provide any example code at all.

Can anyone nudge me in the right direction?

What I eventually used was this:

try {
    // Set up the socket address
    InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(), config.getHttpsPort());

    // Initialise the HTTPS server
    HttpsServer httpsServer = HttpsServer.create(address, 0);
    SSLContext sslContext = SSLContext.getInstance("TLS");

    // Initialise the keystore
    char[] password = "simulator".toCharArray();
    KeyStore ks = KeyStore.getInstance("JKS");
    FileInputStream fis = new FileInputStream("lig.keystore");
    ks.load(fis, password);

    // Set up the key manager factory
    KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
    kmf.init(ks, password);

    // Set up the trust manager factory
    TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
    tmf.init(ks);

    // Set up the HTTPS context and parameters
    sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
    httpsServer.setHttpsConfigurator(new HttpsConfigurator(sslContext) {
        public void configure(HttpsParameters params) {
            try {
                // Initialise the SSL context
                SSLContext c = SSLContext.getDefault();
                SSLEngine engine = c.createSSLEngine();
                params.setNeedClientAuth(false);
                params.setCipherSuites(engine.getEnabledCipherSuites());
                params.setProtocols(engine.getEnabledProtocols());

                // Get the default parameters
                SSLParameters defaultSSLParameters = c.getDefaultSSLParameters();
                params.setSSLParameters(defaultSSLParameters);
            } catch (Exception ex) {
                ILogger log = new LoggerFactory().getLogger();
                log.exception(ex);
                log.error("Failed to create HTTPS port");
            }
        }
    });
    LigServer server = new LigServer(httpsServer);
    joinableThreadList.add(server.getJoinableThread());
} catch (Exception exception) {
    log.exception(exception);
    log.error("Failed to create HTTPS server on port " + config.getHttpsPort() + " of localhost");
}

To generate a keystore:

$ keytool -genkeypair -keyalg RSA -alias self_signed -keypass simulator \
  -keystore lig.keystore -storepass simulator

See also here.

Potentially storepass and keypass might be different, in which case the ks.load and kmf.init must use storepass and keypass, respectively.

I updated your answer for a HTTPS server (not socket-based). It might help with CSRF and AJAX calls.

import java.io.*;
import java.net.InetSocketAddress;
import java.lang.*;
import java.net.URL;
import com.sun.net.httpserver.HttpsServer;
import java.security.KeyStore;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.TrustManagerFactory;
import com.sun.net.httpserver.*;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLParameters;

import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URLConnection;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.security.cert.X509Certificate;

import java.net.InetAddress;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.HttpsExchange;

public class SimpleHTTPSServer {

    public static class MyHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange t) throws IOException {
            String response = "This is the response";
            HttpsExchange httpsExchange = (HttpsExchange) t;
            t.getResponseHeaders().add("Access-Control-Allow-Origin", "*");
            t.sendResponseHeaders(200, response.getBytes().length);
            OutputStream os = t.getResponseBody();
            os.write(response.getBytes());
            os.close();
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {

        try {
            // setup the socket address
            InetSocketAddress address = new InetSocketAddress(8000);

            // initialise the HTTPS server
            HttpsServer httpsServer = HttpsServer.create(address, 0);
            SSLContext sslContext = SSLContext.getInstance("TLS");

            // initialise the keystore
            char[] password = "password".toCharArray();
            KeyStore ks = KeyStore.getInstance("JKS");
            FileInputStream fis = new FileInputStream("testkey.jks");
            ks.load(fis, password);

            // setup the key manager factory
            KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
            kmf.init(ks, password);

            // setup the trust manager factory
            TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
            tmf.init(ks);

            // setup the HTTPS context and parameters
            sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
            httpsServer.setHttpsConfigurator(new HttpsConfigurator(sslContext) {
                public void configure(HttpsParameters params) {
                    try {
                        // initialise the SSL context
                        SSLContext context = getSSLContext();
                        SSLEngine engine = context.createSSLEngine();
                        params.setNeedClientAuth(false);
                        params.setCipherSuites(engine.getEnabledCipherSuites());
                        params.setProtocols(engine.getEnabledProtocols());

                        // Set the SSL parameters
                        SSLParameters sslParameters = context.getSupportedSSLParameters();
                        params.setSSLParameters(sslParameters);

                    } catch (Exception ex) {
                        System.out.println("Failed to create HTTPS port");
                    }
                }
            });
            httpsServer.createContext("/test", new MyHandler());
            httpsServer.setExecutor(null); // creates a default executor
            httpsServer.start();

        } catch (Exception exception) {
            System.out.println("Failed to create HTTPS server on port " + 8000 + " of localhost");
            exception.printStackTrace();

        }
    }

}

To create a self-signed certificate:

keytool -genkeypair -keyalg RSA -alias selfsigned -keystore testkey.jks -storepass password -validity 360 -keysize 2048

With ServerSocket

You can use the class that HttpsServer is built around to be even more light-weight: ServerSocket.

Single-threaded

The following program is a very simple, single-threaded server listening on port 8443. Messages are encrypted with TLS using the keys in ./keystore.jks:

public static void main(String... args) {
    var address = new InetSocketAddress("0.0.0.0", 8443);

    startSingleThreaded(address);
}

public static void startSingleThreaded(InetSocketAddress address) {

    System.out.println("Start single-threaded server at " + address);

    try (var serverSocket = getServerSocket(address)) {

        var encoding = StandardCharsets.UTF_8;

        // This infinite loop is not CPU-intensive since method "accept" blocks
        // until a client has made a connection to the socket
        while (true) {
            try (var socket = serverSocket.accept();
                 // Use the socket to read the client's request
                 var reader = new BufferedReader(new InputStreamReader(
                         socket.getInputStream(), encoding.name()));
                 // Writing to the output stream and then closing it sends
                 // data to the client
                 var writer = new BufferedWriter(new OutputStreamWriter(
                         socket.getOutputStream(), encoding.name()))
            ) {
                getHeaderLines(reader).forEach(System.out::println);

                writer.write(getResponse(encoding));
                writer.flush();

            } catch (IOException e) {
                System.err.println("Exception while handling connection");
                e.printStackTrace();
            }
        }
    } catch (Exception e) {
        System.err.println("Could not create socket at " + address);
        e.printStackTrace();
    }
}

private static ServerSocket getServerSocket(InetSocketAddress address)
        throws Exception {

    // Backlog is the maximum number of pending connections on the socket,
    // 0 means that an implementation-specific default is used
    int backlog = 0;

    var keyStorePath = Path.of("./keystore.jks");
    char[] keyStorePassword = "pass_for_self_signed_cert".toCharArray();

    // Bind the socket to the given port and address
    var serverSocket = getSslContext(keyStorePath, keyStorePassword)
            .getServerSocketFactory()
            .createServerSocket(address.getPort(), backlog, address.getAddress());

    // We don't need the password anymore → Overwrite it
    Arrays.fill(keyStorePassword, '0');

    return serverSocket;
}

private static SSLContext getSslContext(Path keyStorePath, char[] keyStorePass)
        throws Exception {

    var keyStore = KeyStore.getInstance("JKS");
    keyStore.load(new FileInputStream(keyStorePath.toFile()), keyStorePass);

    var keyManagerFactory = KeyManagerFactory.getInstance("SunX509");
    keyManagerFactory.init(keyStore, keyStorePass);

    var sslContext = SSLContext.getInstance("TLS");
    // Null means using default implementations for TrustManager and SecureRandom
    sslContext.init(keyManagerFactory.getKeyManagers(), null, null);
    return sslContext;
}

private static String getResponse(Charset encoding) {
    var body = "The server says hi