Java SSH 登录时更改密码

Question

private String user = "root",
            newPassword = "test123";

private int port = 22;

public SSHConnection(String host, String password) {
     try {
        JSch jsch = new JSch();

        Session session = jsch.getSession(user, host, port);
        session.setPassword(password);
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);
        session.connect();

        ChannelExec channel = (ChannelExec)session.openChannel("exec");
        OutputStream out = channel.getOutputStream();
        ((ChannelExec)channel).setErrStream(System.err);
        channel.connect();

        out.write(password.getBytes());
        out.flush();
        out.write(newPassword.getBytes());
        out.flush();
        out.write(newPassword.getBytes());
        out.flush();

        channel.disconnect();
        session.disconnect();
    }
    catch(Exception e) {
        e.printStackTrace();
    }
}

我第一次登录服务器时被要求更改密码。我正在尝试使用 JSch 来实现这一点，但我不确定如何才能实现这一点。据我了解，我无法使用任何命令，因为我被迫在执行任何操作之前更改密码，所以我无法使用

 (echo old_password; echo new_password; echo new_password) | passwd username

Answer 1

我通过调用channel.setPty(true);解决了我的问题

private String user = "root",
            newPassword = "test123";

private int port = 22;

public SSHConnection(String host, String password) {
     try {
        JSch jsch = new JSch();

        Session session = jsch.getSession(user, host, port);
        session.setPassword(password);
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);
        session.connect();

        ChannelExec channel = (ChannelExec)session.openChannel("exec");
        OutputStream out = channel.getOutputStream();

        ((ChannelExec)channel).setErrStream(System.err);
        channel.setPty(true);
        channel.connect();

        out.write((password + "\n").getBytes());
        out.flush();
        Thread.sleep(1000);

        out.write((newPassword + "\n").getBytes());
        out.flush();
        Thread.sleep(1000);

        out.write((newPassword + "\n").getBytes());
        out.flush();
        Thread.sleep(1000);

        channel.disconnect();
        session.disconnect();
    }
    catch(Exception e) {
        e.printStackTrace();
    }
}

为了保持一致性，我在每次输入之前添加了 sleep ，通常您会希望在输入每个密码之前等待输出，但对于我的使用来说，这样做就可以了。