SSLSocket

摘要：定义扩展并提供使用或协议的安全套接字。它也是基于正常的流套接字，但是在网络传输协议如上添加了安全保护层。

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。

SSLServerSocket需要证书进行安全全验证

</>复制代码 
$ keytool -genkey -keystore seckey -keyalg rsa -alias SSL

</>复制代码 
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];
            }
        };
    }
}

</>复制代码 
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());
    }
}

服务器结果如下图

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

客户端接收到乱码

</>复制代码 
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());
    }
}

服务器结果如下图

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

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

</>复制代码 
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());
    }
}

服务器结果如下图

客户端结果如下图

代码地址

本文章的代码在cn.sh.sslsocket包中！