/*

 * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

//

// SunJSSE does not support dynamic system properties, no way to re-use

// system properties in samevm/agentvm mode.

//

/*

 * @test

 * @bug 7105780

 * @summary Add SSLSocket client/SSLEngine server to templates directory.

 * @run main/othervm SSLSocketSSLEngineTemplate

 */

/**

 * A SSLSocket/SSLEngine interop test case.  This is not the way to

 * code SSLEngine-based servers, but works for what we need to do here,

 * which is to make sure that SSLEngine/SSLSockets can talk to each other.

 * SSLEngines can use direct or indirect buffers, and different code

 * is used to get at the buffer contents internally, so we test that here.

 *

 * The test creates one SSLSocket (client) and one SSLEngine (server).

 * The SSLSocket talks to a raw ServerSocket, and the server code

 * does the translation between byte [] and ByteBuffers that the SSLEngine

 * can use.  The "transport" layer consists of a Socket Input/OutputStream

 * and two byte buffers for the SSLEngines:  think of them

 * as directly connected pipes.

 *

 * Again, this is a *very* simple example: real code will be much more

 * involved.  For example, different threading and I/O models could be

 * used, transport mechanisms could close unexpectedly, and so on.

 *

 * When this application runs, notice that several messages

 * (wrap/unwrap) pass before any application data is consumed or

 * produced.  (For more information, please see the SSL/TLS

 * specifications.)  There may several steps for a successful handshake,

 * so it's typical to see the following series of operations:

 *

 *      client          server          message

 *      ======          ======          =======

 *      write()         ...             ClientHello

 *      ...             unwrap()        ClientHello

 *      ...             wrap()          ServerHello/Certificate

 *      read()          ...             ServerHello/Certificate

 *      write()         ...             ClientKeyExchange

 *      write()         ...             ChangeCipherSpec

 *      write()         ...             Finished

 *      ...             unwrap()        ClientKeyExchange

 *      ...             unwrap()        ChangeCipherSpec

 *      ...             unwrap()        Finished

 *      ...             wrap()          ChangeCipherSpec

 *      ...             wrap()          Finished

 *      read()          ...             ChangeCipherSpec

 *      read()          ...             Finished

 */

import javax.net.ssl.*;

import javax.net.ssl.SSLEngineResult.*;

import java.io.*;

import java.net.*;

import java.security.*;

import java.nio.*;

public class SSLSocketSSLEngineTemplate {

    /*

     * Enables logging of the SSL/TLS operations.

     */

    private static final boolean logging = true;

    /*

     * Enables the JSSE system debugging system property:

     *

     *     -Djavax.net.debug=all

     *

     * This gives a lot of low-level information about operations underway,

     * including specific handshake messages, and might be best examined

     * after gaining some familiarity with this application.

     */

    private static final boolean debug = false;

    private final SSLContext sslc;

    private SSLEngine serverEngine;     // server-side SSLEngine

    private final byte[] serverMsg =

        "Hi there Client, I'm a Server.".getBytes();

    private final byte[] clientMsg =

        "Hello Server, I'm a Client!  Pleased to meet you!".getBytes();

    private ByteBuffer serverOut;       // write side of serverEngine

    private ByteBuffer serverIn;        // read side of serverEngine

    private volatile Exception clientException;

    private volatile Exception serverException;

    /*

     * For data transport, this example uses local ByteBuffers.

     */

    private ByteBuffer cTOs;            // "reliable" transport client->server

    private ByteBuffer sTOc;            // "reliable" transport server->client

    /*

     * The following is to set up the keystores/trust material.

     */

    private static final String pathToStores = "../etc";

    private static final String keyStoreFile = "keystore";

    private static final String trustStoreFile = "truststore";

    private static final String passwd = "passphrase";

    private static final String keyFilename =

            System.getProperty("test.src", ".") + "/" + pathToStores

            + "/" + keyStoreFile;

    private static final String trustFilename =

            System.getProperty("test.src", ".") + "/" + pathToStores

            + "/" + trustStoreFile;

    /*

     * Main entry point for this test.

     */

    public static void main(String args[]) throws Exception {

        // reset security properties to make sure that the algorithms

        // and keys used in this test are not disabled.

        Security.setProperty("jdk.tls.disabledAlgorithms", "");

        Security.setProperty("jdk.certpath.disabledAlgorithms", "");

        if (debug) {

            System.setProperty("javax.net.debug", "all");

        }

        String [] protocols = new String [] {

            "SSLv3", "TLSv1", "TLSv1.1", "TLSv1.2" };

        for (String protocol : protocols) {

            log("Testing " + protocol);

            /*

             * Run the tests with direct and indirect buffers.

             */

            SSLSocketSSLEngineTemplate test =

                new SSLSocketSSLEngineTemplate(protocol);

            log("-------------------------------------");

            log("Testing " + protocol + " for direct buffers ...");

            test.runTest(true);

            log("---------------------------------------");

            log("Testing " + protocol + " for indirect buffers ...");

            test.runTest(false);

        }

        System.out.println("Test Passed.");

    }

    /*

     * Create an initialized SSLContext to use for these tests.

     */

    public SSLSocketSSLEngineTemplate(String protocol) throws Exception {

        KeyStore ks = KeyStore.getInstance("JKS");

        KeyStore ts = KeyStore.getInstance("JKS");

        char[] passphrase = "passphrase".toCharArray();

        try (FileInputStream keyFile = new FileInputStream(keyFilename);

                FileInputStream trustFile = new FileInputStream(trustFilename)) {

            ks.load(keyFile, passphrase);

            ts.load(trustFile, passphrase);

        }

        KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");

        kmf.init(ks, passphrase);

        TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");

        tmf.init(ts);

        SSLContext sslCtx = SSLContext.getInstance(protocol);

        sslCtx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);

        sslc = sslCtx;

    }

    /*

     * Run the test.

     *

     * Sit in a tight loop, with the server engine calling wrap/unwrap

     * regardless of whether data is available or not.  We do this until

     * we get the application data.  Then we shutdown and go to the next one.

     *

     * The main loop handles all of the I/O phases of the SSLEngine's

     * lifetime:

     *

     *     initial handshaking

     *     application data transfer

     *     engine closing

     *

     * One could easily separate these phases into separate

     * sections of code.

     */

    private void runTest(boolean direct) throws Exception {

        boolean serverClose = direct;

        // generates the server-side Socket

        try (ServerSocket serverSocket = new ServerSocket()) {

            serverSocket.setReuseAddress(false);

            serverSocket.bind(null);

            int port = serverSocket.getLocalPort();

            Thread thread = createClientThread(port, serverClose);

            createSSLEngine();

            createBuffers(direct);

            // server-side socket that will read

            try (Socket socket = serverSocket.accept()) {

                socket.setSoTimeout(500);

                boolean closed = false;

                // will try to read one more time in case client message

                // is fragmented to multiple pieces

                boolean retry = true;

                InputStream is = socket.getInputStream();

                OutputStream os = socket.getOutputStream();

                SSLEngineResult serverResult;   // results from last operation

                /*

                 * Examining the SSLEngineResults could be much more involved,

                 * and may alter the overall flow of the application.

                 *

                 * For example, if we received a BUFFER_OVERFLOW when trying

                 * to write to the output pipe, we could reallocate a larger

                 * pipe, but instead we wait for the peer to drain it.

                 */

                byte[] inbound = new byte[8192];

                byte[] outbound = new byte[8192];

                while (!isEngineClosed(serverEngine)) {

                    int len;

                    // Inbound data

                    log("================");

                    // Read from the Client side.

                    try {

                        len = is.read(inbound);

                        if (len == -1) {

                            throw new Exception("Unexpected EOF");

                        }

                        cTOs.put(inbound, 0, len);

                    } catch (SocketTimeoutException ste) {

                        // swallow.  Nothing yet, probably waiting on us.

                    }

                    cTOs.flip();

                    serverResult = serverEngine.unwrap(cTOs, serverIn);

                    log("server unwrap: ", serverResult);

                    runDelegatedTasks(serverResult, serverEngine);

                    cTOs.compact();

                    // Outbound data

                    log("----");

                    serverResult = serverEngine.wrap(serverOut, sTOc);

                    log("server wrap: ", serverResult);

                    runDelegatedTasks(serverResult, serverEngine);

                    sTOc.flip();

                    if ((len = sTOc.remaining()) != 0) {

                        sTOc.get(outbound, 0, len);

                        os.write(outbound, 0, len);

                        // Give the other side a chance to process

                    }

                    sTOc.compact();

                    if (!closed && (serverOut.remaining() == 0)) {

                        closed = true;

                        /*

                         * We'll alternate initiatating the shutdown.

                         * When the server initiates, it will take one more

                         * loop, but tests the orderly shutdown.

                         */

                        if (serverClose) {

                            serverEngine.closeOutbound();

                        }

                        serverIn.flip();

                        /*

                         * A sanity check to ensure we got what was sent.

                         */

                        if (serverIn.remaining() !=  clientMsg.length) {

                            if (retry &&

                                    serverIn.remaining() < clientMsg.length) {

                                log("Need to read more from client");

                                serverIn.compact();

                                retry = false;

                                continue;

                            } else {

                                throw new Exception(

                                        "Client: Data length error");

                            }

                        }

                        for (int i = 0; i < clientMsg.length; i++) {

                            if (clientMsg[i] != serverIn.get()) {

                                throw new Exception(

                                        "Client: Data content error");

                            }

                        }

                        serverIn.compact();

                    }

                }

            } catch (Exception e) {

                serverException = e;

            } finally {

                // Wait for the client to join up with us.

                if (thread != null) {

                    thread.join();

                }

            }

        } finally {

            if (serverException != null) {

                if (clientException != null) {

                    serverException.initCause(clientException);

                }

                throw serverException;

            }

            if (clientException != null) {

                if (serverException != null) {

                    clientException.initCause(serverException);

                }

                throw clientException;

            }

        }

    }

    /*

     * Create a client thread which does simple SSLSocket operations.

     * We'll write and read one data packet.

     */

    private Thread createClientThread(final int port,

            final boolean serverClose) throws Exception {

        Thread t = new Thread("ClientThread") {

            @Override

            public void run() {

                // client-side socket

                try (SSLSocket sslSocket = (SSLSocket)sslc.getSocketFactory().

                            createSocket("localhost", port)) {

                    OutputStream os = sslSocket.getOutputStream();

                    InputStream is = sslSocket.getInputStream();

                    // write(byte[]) goes in one shot.

                    os.write(clientMsg);

                    byte[] inbound = new byte[2048];

                    int pos = 0;

                    int len;

                    while ((len = is.read(inbound, pos, 2048 - pos)) != -1) {

                        pos += len;

                        // Let the client do the closing.

                        if ((pos == serverMsg.length) && !serverClose) {

                            sslSocket.close();

                            break;

                        }

                    }

                    if (pos != serverMsg.length) {

                        throw new Exception("Client:  Data length error");

                    }

                    for (int i = 0; i < serverMsg.length; i++) {

                        if (inbound[i] != serverMsg[i]) {

                            throw new Exception("Client:  Data content error");

                        }

                    }

                } catch (Exception e) {

                    clientException = e;

                }

            }

        };

        t.start();

        return t;

    }

    /*

     * Using the SSLContext created during object creation,

     * create/configure the SSLEngines we'll use for this test.

     */

    private void createSSLEngine() throws Exception {

        /*

         * Configure the serverEngine to act as a server in the SSL/TLS

         * handshake.

         */

        serverEngine = sslc.createSSLEngine();

        serverEngine.setUseClientMode(false);

        serverEngine.getNeedClientAuth();

    }

    /*

     * Create and size the buffers appropriately.

     */

    private void createBuffers(boolean direct) {

        SSLSession session = serverEngine.getSession();

        int appBufferMax = session.getApplicationBufferSize();

        int netBufferMax = session.getPacketBufferSize();

        /*

         * We'll make the input buffers a bit bigger than the max needed

         * size, so that unwrap()s following a successful data transfer

         * won't generate BUFFER_OVERFLOWS.

         *

         * We'll use a mix of direct and indirect ByteBuffers for

         * tutorial purposes only.  In reality, only use direct

         * ByteBuffers when they give a clear performance enhancement.

         */

        if (direct) {

            serverIn = ByteBuffer.allocateDirect(appBufferMax + 50);

            cTOs = ByteBuffer.allocateDirect(netBufferMax);

            sTOc = ByteBuffer.allocateDirect(netBufferMax);

        } else {

            serverIn = ByteBuffer.allocate(appBufferMax + 50);

            cTOs = ByteBuffer.allocate(netBufferMax);

            sTOc = ByteBuffer.allocate(netBufferMax);

        }

        serverOut = ByteBuffer.wrap(serverMsg);

    }

    /*

     * If the result indicates that we have outstanding tasks to do,

     * go ahead and run them in this thread.

     */

    private static void runDelegatedTasks(SSLEngineResult result,

            SSLEngine engine) throws Exception {

        if (result.getHandshakeStatus() == HandshakeStatus.NEED_TASK) {

            Runnable runnable;

            while ((runnable = engine.getDelegatedTask()) != null) {

                log("\trunning delegated task...");

                runnable.run();

            }

            HandshakeStatus hsStatus = engine.getHandshakeStatus();

            if (hsStatus == HandshakeStatus.NEED_TASK) {

                throw new Exception(

                        "handshake shouldn't need additional tasks");

            }

            log("\tnew HandshakeStatus: " + hsStatus);

        }

    }

    private static boolean isEngineClosed(SSLEngine engine) {

        return (engine.isOutboundDone() && engine.isInboundDone());

    }

    /*

     * Logging code

     */

    private static boolean resultOnce = true;

    private static void log(String str, SSLEngineResult result) {

        if (!logging) {

            return;

        }

        if (resultOnce) {

            resultOnce = false;

            System.out.println("The format of the SSLEngineResult is: \n"

                    + "\t\"getStatus() / getHandshakeStatus()\" +\n"

                    + "\t\"bytesConsumed() / bytesProduced()\"\n");

        }

        HandshakeStatus hsStatus = result.getHandshakeStatus();

        log(str

                + result.getStatus() + "/" + hsStatus + ", "

                + result.bytesConsumed() + "/" + result.bytesProduced()

                + " bytes");

        if (hsStatus == HandshakeStatus.FINISHED) {

            log("\t...ready for application data");

        }

    }

    private static void log(String str) {

        if (logging) {

            System.out.println(str);

        }

    }

}