Apache MINA SFTP Example

Question

I am trying to set up an SFTP server with several users, each of which has its own home directory.

I read this answer that explains how to set up a virtual directory for one user, but I'm not sure how to have multiple users each with their own home directory.

Can someone tell me how to do this?

Answer 1

Finally, I started to work. Here is a working example:

pom.xml

<dependency> <groupId>org.apache.sshd</groupId> <artifactId>sshd-core</artifactId> <version>0.14.0</version> </dependency> 

Test.java

 import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.sshd.SshServer; import org.apache.sshd.common.NamedFactory; import org.apache.sshd.common.file.virtualfs.VirtualFileSystemFactory; import org.apache.sshd.server.Command; import org.apache.sshd.server.PasswordAuthenticator; import org.apache.sshd.server.UserAuth; import org.apache.sshd.server.auth.UserAuthPassword; import org.apache.sshd.server.command.ScpCommandFactory; import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider; import org.apache.sshd.server.session.ServerSession; import org.apache.sshd.server.sftp.SftpSubsystem; public class Test { public static void main(String args[]) { try { Runtime.getRuntime().exec("sudo fuser -k " + "2222" + "/tcp"); } catch (IOException ex) { Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex); } File TEST = new File("test"); File ADMIN = new File("admin"); File ERROR = new File("error"); TEST.mkdirs(); ADMIN.mkdirs(); ERROR.mkdirs(); SshServer sshServer = SshServer.setUpDefaultServer(); sshServer.setFileSystemFactory(new VirtualFileSystemFactory(ERROR.getAbsolutePath())); sshServer.setPort(2222); sshServer.setKeyPairProvider(new SimpleGeneratorHostKeyProvider(new File("my.pem").getAbsolutePath())); sshServer.setCommandFactory(new ScpCommandFactory()); List<NamedFactory<UserAuth>> userAuthFactories = new ArrayList<>(); userAuthFactories.add(new UserAuthPassword.Factory()); sshServer.setUserAuthFactories(userAuthFactories); sshServer.setPasswordAuthenticator(new PasswordAuthenticator() { @Override public boolean authenticate(String username, String password, ServerSession session) { if ((username.equals("test")) && (password.equals("test"))) { sshServer.setFileSystemFactory(new VirtualFileSystemFactory(TEST.getAbsolutePath())); return true; } if ((username.equals("admin")) && (password.equals("admin"))) { sshServer.setFileSystemFactory(new VirtualFileSystemFactory(ADMIN.getAbsolutePath())); return true; } return false; } }); List<NamedFactory<Command>> namedFactoryList = new ArrayList<>(); namedFactoryList.add(new SftpSubsystem.Factory()); sshServer.setSubsystemFactories(namedFactoryList); try { sshServer.start(); } catch (IOException ex) { Logger.getLogger(CarrierSFTPServer.class.getName()).log(Level.SEVERE, null, ex); } } } 

Answer 2

Updated version above (starting from 1.4.0 from sshd-core). Please note that I did not specify the file for the host key provider, since mine was for the Junit integration test.

 List<NamedFactory<UserAuth>> userAuthFactories = new ArrayList<NamedFactory<UserAuth>>(); userAuthFactories.add(new UserAuthPasswordFactory()); List<NamedFactory<Command>> sftpCommandFactory = new ArrayList<NamedFactory<Command>>(); sftpCommandFactory.add(new SftpSubsystemFactory()); SshServer sshd = SshServer.setUpDefaultServer(); sshd.setPort(22); sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider()); sshd.setUserAuthFactories(userAuthFactories); sshd.setCommandFactory(new ScpCommandFactory()); sshd.setSubsystemFactories(sftpCommandFactory); sshd.setPasswordAuthenticator(new PasswordAuthenticator() { @Override public boolean authenticate(String username, String password, ServerSession session) { if ((username.equals("admin")) && (password.equals("admin"))) { sshd.setFileSystemFactory(new VirtualFileSystemFactory(new File("C:\\devl").toPath())); return true; } return false; } }); sshd.start(); 

Answer 3

I am trying to upgrade my 0.13.0 sshd-core and sshd-sftp to 2.1.0. But there are huge changes in implementation. Anyone using the latest versions that supports SFTP 6.0