services/console-proxy/server/src/main/java/com/cloud/consoleproxy/vnc/security/VncAuthSecurity.java

// Licensed to the Apache Software Foundation (ASF) under one
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// distributed with this work for additional information
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// 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
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package com.cloud.consoleproxy.vnc.security;

import com.cloud.consoleproxy.util.Logger;
import com.cloud.consoleproxy.vnc.NoVncClient;
import com.cloud.consoleproxy.vnc.network.NioSocketHandler;
import com.cloud.utils.exception.CloudRuntimeException;

import java.io.IOException;
import java.nio.ByteBuffer;

public class VncAuthSecurity implements VncSecurity {

    private final String vmPass;

    private static final int VNC_AUTH_CHALLENGE_SIZE = 16;
    private static final Logger s_logger = Logger.getLogger(VncAuthSecurity.class);

    public VncAuthSecurity(String vmPass) {
        this.vmPass = vmPass;
    }

    @Override
    public void process(NioSocketHandler socketHandler) throws IOException {
        s_logger.info("VNC server requires password authentication");

        // Read the challenge & obtain the user's password
        ByteBuffer challenge = ByteBuffer.allocate(VNC_AUTH_CHALLENGE_SIZE);
        socketHandler.readBytes(challenge, VNC_AUTH_CHALLENGE_SIZE);

        byte[] encodedPassword;
        try {
            encodedPassword = NoVncClient.encodePassword(challenge.array(), vmPass);
        } catch (Exception e) {
            s_logger.error("Cannot encrypt client password to send to server: " + e.getMessage());
            throw new CloudRuntimeException("Cannot encrypt client password to send to server: " + e.getMessage());
        }

        // Return the response to the server
        socketHandler.writeBytes(ByteBuffer.wrap(encodedPassword), encodedPassword.length);
        socketHandler.flushWriteBuffer();
        s_logger.info("Finished VNCAuth security");
    }
}