Question

我使用Sockets开发了一个聊天服务器和客户端，一切都很好，直到我在网上看到普通的Socket通信容易受到攻击。谷歌搜索了一段时间后，我遇到了this page，它显示了一个示例SSLServerSocket和SSLSocket实现（下面的代码）。

如果我按照以下代码中的步骤操作，我想知道我的服务器和客户端之间的通信是否安全。

服务器代码

class EchoServer {
  public static void main(String[] args) throws IOException {
    SSLServerSocket sslServerSocket = null;
    try {
      SSLServerSocketFactory sslServerSocketFactory = (SSLServerSocketFactory) SSLServerSocketFactory.getDefault();
      sslServerSocket = (SSLServerSocket) sslServerSocketFactory.createServerSocket(9999);
      SSLSocket sslSocket = (SSLSocket) sslServerSocket.accept();
      PrintWriter out = new PrintWriter(sslSocket.getOutputStream(),true);
      BufferedReader in = new BufferedReader(new InputStreamReader(sslSocket.getInputStream()));
      String inputLine;
      while ((inputLine = in.readLine()) != null) {
        System.out.println(inputLine);
        out.println(inputLine);
      }
    } finally {
      if (sslServerSocket != null) {
        try {
          sslServerSocket.close();
        } catch (IOException x) {
          // handle error
        }
      }
    }
  }
}

客户代码

class EchoClient {
  public static void main(String[] args) throws IOException {
    SSLSocket sslSocket = null;
    try {
      SSLSocketFactory sslSocketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
      sslSocket = (SSLSocket) sslSocketFactory.createSocket("localhost", 9999);
      PrintWriter out = new PrintWriter(sslSocket.getOutputStream(), true);
      BufferedReader in = new BufferedReader(new InputStreamReader(sslSocket.getInputStream()));
      BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
      String userInput;
      while ((userInput = stdIn.readLine()) != null) {
        out.println(userInput);
        System.out.println(in.readLine());
      }
    } finally {
      if (sslSocket != null) {
        try {
          sslSocket.close();
        } catch (IOException x) {
          // handle error
        }
      }
    }
  }
}

Answer 1

您应该通过HandshakeCompletionListener或SSLSession获取对等证书，以验证您是否正在与您认为正在与之通话的主持人通话。除此之外，从安全角度来看，您的代码是可以的。

但是你也应该知道你不应该通过网络使用PrintWriter，因为它会吞下异常。

SSLSocket通信是否使用附加代码安全？

1 个答案: