SFTP server multiple user authentication

Question

I am trying to extend the user authentication example, which is also presented here , so that multiple users can login to the server. I would also like to assign a different home directory for each user. So far, I haven't been able to find any such utility provided by the Apache SSHD API , so I have tried the following workaround, by using the utilities provided by the Apache FtpServer .

What I attempt to do is:

1. create a UserManager object to manage a list of users and store their information in a property file, in a way similar to this example

2. create a PasswordAuthenticator that makes use of the UserManager in its authenticate method, as follows:

    public class MyPasswordAuthenticator implements PasswordAuthenticator { private UserManager userManager; public MyPasswordAuthenticator(){ this.userManager=null; } public MyPasswordAuthenticator(UserManager manager) { this.userManager=manager; } @Override public boolean authenticate(String username, String password, ServerSession session) throws PasswordChangeRequiredException { if (this.userManager==null) return false; User usr=null; try { usr = userManager.getUserByName(username); } catch (FtpException e) { e.printStackTrace(); } if (usr==null) return false; else{ String pass=usr.getPassword(); return password.equals(pass); } } } 

However, the usr.getPassword() returns null, even though a) the password fields in the property file do have values b) I have checked the functions getName() and getHomeDirectory() and they return their respective String values.

My question is, why does this happen and what should be done to fix this?

Answer 1

我找到了一种使其工作的方法，它是：

usr = this.userManager.authenticate(new UsernamePasswordAuthentication(username, password));