Java SSH在登錄時更改密碼

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(); 
    } 
} 

我被要求在第一次登錄服務器時更改密碼。我正在嘗試使用JSch來做到這一點，但我不知道該如何實現。據我瞭解，我可以不使用任何命令，我被迫做任何事情之前更改密碼，所以我不能用

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

Answer 1

我解決我的問題，通過調用channel.setPty（真）;

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(); 
    } 
} 

我每個輸入的一致性前加入睡覺，通常你會想要進入每個密碼之前必須等待輸出，但對於我的用途，這將做。