OpenSSH : SFTP only + Chroot2024/12/19

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

# create a group for SFTP only

[root@dlp ~]#

groupadd sftp_users

[root@dlp ~]#

vi /etc/ssh/sshd_config

# line 123 : comment out and add a line

#Subsystem      sftp    /usr/libexec/openssh/sftp-server
Subsystem       sftp    internal-sftp

# add to last line
Match Group sftp_users
  X11Forwarding no
  AllowTcpForwarding no
  ChrootDirectory /home
  ForceCommand internal-sftp

[root@dlp ~]#

systemctl restart sshd

# for example, set [cent] user as SFTP only user

[root@dlp ~]#

usermod -aG sftp_users cent

[2]	Access the target user via SSH or SFTP and check that it works.

[cent@node01 ~]$

ssh dlp.srv.world

Enter passphrase for key '/home/cent/.ssh/id_ed25519':
This service allows sftp connections only.
Connection to dlp.srv.world closed.
# denied normally

[cent@node01 ~]$

sftp dlp.srv.world

Enter passphrase for key '/home/cent/.ssh/id_ed25519':
Connected to dlp.srv.world.
sftp> ls -l
drwx------    ? 1000     1000          178 Dec 19 11:13 cent
sftp> pwd
Remote working directory: /
sftp> exit

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