How to allow only SFTP access and no shell access.

 

Requirement :

• Restricted to SFTP access
• Disallow all SSH connection coming from sftp user

Lab setup details

• Ubuntu 16.04
• Hostname : cyberkeeda.sftp.com

• Create a sftp user

Syntax Template

 #  adduser sftpadmin

• Create a sftp folder, this folder will be used for sftp user
• Provide ownership to root and give other users only read and execute rights.

Syntax Template

 # mkdir /var/sftpdata
 
 # chown root.root /var/sftpdata

 # chmod 755 /var/sftpdata

• Update SSH server config file with below snippet 

Syntax Template

 #  vim /etc/ssh/sshd_config

• Copy paste the below snippet at the bottom of the file and save.

Syntax Template

  Match User sftpadmin
  ForceCommand internal-sftp
  PasswordAuthentication yes
  ChrootDirectory /var/sftpdata
  PermitTunnel no
  AllowAgentForwarding no
  AllowTcpForwarding no
  X11Forwarding no

• Restart SSHD server

Syntax Template

 #  systemctl restart sshd

• Check by logging in via sftp and ssh both

Syntax Template

 #  sftp sftpadmin@cyberkeeda.sftp.com