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。我正在尝试用JSch来做，但我不确定如何才能实现这一目标。据我所知，我无法使用任何命令，因为我在做任何事情之前都被迫更改密码，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();
    }
}

我在每个输入之前添加了睡眠以保持一致性，通常你想在输入每个密码之前等待输出，但对于我的用途，这样做。

Answer 2

对我来说，可以在一个命令行中运行下一个命令，而不使用Thread.sleep

echo -e \"new-password\nnew-password\" | passwd user-linux

登录时Java SSH更改密码

2 个答案: