SFTP server in Ubuntu

How to setup a basic SFTP server in Ubuntu.

Requirements

• No login
• Read and write permissions
• Access only to a base directory
• Default directory should be the base directory

Instalation

Install the sftp server package

sudo apt-get install openssh-server

Create sftp group and user

sudo groupadd sftpgroup
sudo useradd myuser -m -G sftpgroup -s /usr/sbin/nologin
sudo passwd myuser

Prepare base sftp directory

sudo chown root:root /home/myuser
sudo mkdir /home/myuser/data
sudo chown myuser:sftpgroup /home/myuser/data

Configure sftp server

Edit the file /etc/ssh/sshd_config

Comment the following line:

#Subsystem sftp /usr/lib/openssh/sftp-server

Add the folowing lines at the end of the file:

Subsystem sftp internal-sftp
Match group sftpgroup
ChrootDirectory %h
X11Forwarding no
AllowTcpForwarding no
ForceCommand internal-sftp -d /data

Restart the server

sudo service ssh restart

Test

$ sftp myuser@localhost
myuser@localhost's password:
Connected to localhost.
sftp> pwd
Remote working directory: /data
sftp> put test.txt
Uploading test.txt to /data/test.txt
test.txt                                                                              100%    0     0.0KB/s   00:00
sftp> ls
test.txt
sftp> quit