OpenSSH : SFTP only + Chroot2023/04/21

	Configure SFTP only + Chroot. Some users who are applied this setting can access only with SFTP and also applied chroot directory.
[1]	For example, Set [/home] as the Chroot directory.

# create a group for SFTP only

root@dlp:~#

groupadd sftp_users

# apply to a user [ubuntu] for SFTP only as an example

root@dlp:~#

usermod -aG sftp_users ubuntu

root@dlp:~#

vi /etc/ssh/sshd_config

# line 118 : comment out and add a line like below

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

Subsystem sftp internal-sftp

# add to the end

Match Group sftp_users
    X11Forwarding no
    AllowTcpForwarding no
    ChrootDirectory /home
    ForceCommand internal-sftp

root@dlp:~#

systemctl restart ssh

[2]	Try to access with a user and verify the settings.

ubuntu@node01:~$

ssh ubuntu@dlp.srv.world

Enter passphrase for key '/home/ubuntu/.ssh/id_rsa':
This service allows sftp connections only.
Connection to dlp.srv.world closed.   # denied as settings

ubuntu@node01:~$

sftp ubuntu@dlp.srv.world

Enter passphrase for key '/home/ubuntu/.ssh/id_rsa':
Connected to dlp.srv.world.
sftp>

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