SSLSocket

SSLSocket定义

SSLSocket扩展Socket并提供使用SSL或TLS协议的安全套接字。它也是基于正常的流套接字，但是在网络传输协议(如TCP)上添加了安全保护层。

SSLSocket相关类

类 功能描述
SSLContext 该类的实例表示安全套接字协议的实现，是SSLSocketFactory、SSLServerSocketFactory和SSLEngine的工厂
SSLSocket 扩展自Socket
SSLServerSocket 扩展自ServerSocket
SSLSocketFactory 抽象类，扩展自SocketFactory，是SSLSocket的工厂
SSLServerSocketFactory 抽象类，扩展自ServerSocketFactory，是SSLServerSocket的工厂
KeysStore 密钥和证书的存储设施
KeyManager 接口，Java Secure Socket Extension密钥管理器
TrustManger 接口，信任管理器
X509TrustedManager TrustManger的子接口，管理X509证书，验证远程安全套接字

SSLServerSocket实现

SSLServerSocket需要证书进行安全全验证

使用keytool工具生成一个名称为seckey证书

$ keytool -genkey -keystore seckey -keyalg rsa -alias SSL

服务端编码

package cn.sh.sslsocket.server;

import javax.net.ssl.*;
import java.io.*;
import java.net.Socket;
import java.security.*;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/**
 * @author sh
 */
public class SSLSocketServer {

    public static void main(String[] args) throws KeyStoreException, IOException, CertificateException, NoSuchAlgorithmException, UnrecoverableKeyException, KeyManagementException {
        //准备KeyStore相关信息
        String keyName = "SSL";
        String keyStoreName = "/Users/sh/workspace/netty-demo/src/cn/sh/sslsocket/seckey";
        char[] keyStorePwd = "123456".toCharArray();
        char[] keyPwd = "1234567890".toCharArray();
        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());

        //装载生成的seckey
        try(InputStream in = new FileInputStream(new File(keyStoreName))) {
            keyStore.load(in, keyStorePwd);
        }

        //初始化KeyManagerFactory
        KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        kmf.init(keyStore, keyPwd);

        //初始化SSLContext
        SSLContext context = SSLContext.getInstance(keyName);
        context.init(kmf.getKeyManagers(), new TrustManager[]{getX509TrustManger()}, new SecureRandom());

        //监听和接受客户端连接
        SSLServerSocketFactory factory = context.getServerSocketFactory();
        SSLServerSocket serverSocket = (SSLServerSocket) factory.createServerSocket(10002);
        System.out.println("服务器端已启动!!!");
        //等待客户端连接
        Socket client = serverSocket.accept();
        System.out.println("客户端地址:" + client.getRemoteSocketAddress());
        //准备输出流，用于向客户端发送信息
        OutputStream output = client.getOutputStream();
        //获取输入流，用于读取客户端发送的信息
        InputStream in = client.getInputStream();
        byte[] buf = new byte[1024];
        int len;
        if ((len = in.read(buf)) != -1) {
            output.write(buf, 0, len);
        }
        //冲刷数据
        output.flush();
        //关闭输入输出流
        output.close();
        in.close();
        serverSocket.close();
    }


    public static X509TrustManager getX509TrustManger() {
        return new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

            }

            @Override
            public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

            }

            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[0];
            }
        };
    }

}

客户端实现

普通Socket连接服务器

实现

package cn.sh.sslsocket.client;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

/**
 * @author sh
 */
public class SocketClient {

    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("localhost", 10002);
        OutputStream output = socket.getOutputStream();
        InputStream input = socket.getInputStream();
        output.write("I am SocketClient".getBytes());
        output.flush();
        byte[] buf = new byte[1024];
        int len;
        StringBuilder builder = new StringBuilder();
        while ((len = input.read(buf)) != -1) {
            builder.append(new String(buf, 0, len));
        }
        System.out.println("client received:" + builder.toString());
    }
}

运行结果

服务器结果如下图

运行结果

服务端会抛出异常javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

客户端结果如下图

运行结果

客户端接收到乱码

使用SSLSocket，不使用证书

编码实现

package cn.sh.sslsocket.client;

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * @author sh
 */
public class NoUseKeySSLSocketClient {

    public static void main(String[] args) throws IOException {
        SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault();
        SSLSocket sslSocket = (SSLSocket) factory.createSocket("localhost", 10002);
        OutputStream output = sslSocket.getOutputStream();
        InputStream input = sslSocket.getInputStream();
        output.write("I am NoUseKeySSLSocketClient".getBytes());
        output.flush();
        byte[] buf = new byte[1024];
        int len;
        StringBuilder builder = new StringBuilder();
        while ((len = input.read(buf)) != -1) {
            builder.append(new String(buf, 0, len));
        }
        System.out.println("client received:" + builder.toString());
    }
}

运行结果

服务器结果如下图

运行结果

服务端会抛出异常javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown

客户端结果如下图

运行结果

客户端会抛出异常sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

使用SSLSocket，并且使用证书

编码实现

package cn.sh.sslsocket.client;

import cn.sh.sslsocket.server.SSLSocketServer;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
 * @author sh
 */
public class SSLSocketClient {

    public static void main(String[] args) throws NoSuchAlgorithmException, KeyManagementException, IOException {
        SSLContext context = SSLContext.getInstance("SSL");
        context.init(null, new TrustManager[]{SSLSocketServer.getX509TrustManger()}, new SecureRandom());
        SSLSocketFactory factory = context.getSocketFactory();

        SSLSocket sslSocket = (SSLSocket) factory.createSocket("localhost", 10002);
        OutputStream output = sslSocket.getOutputStream();
        InputStream input = sslSocket.getInputStream();
        output.write("I am SSLSocketClient".getBytes());
        output.flush();
        byte[] buf = new byte[1024];
        int len;
        StringBuilder builder = new StringBuilder();
        while ((len = input.read(buf)) != -1) {
            builder.append(new String(buf, 0, len));
        }
        output.close();
        System.out.println("client received:" + builder.toString());
    }
}

运行结果

服务器结果如下图

运行结果

客户端结果如下图

运行结果

代码地址

代码地址

本文章的代码在cn.sh.sslsocket包中！

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