Rocky_Linux_8
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OpenSSH : SFTP only + Chroot
2021/07/19
 
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

[root@dlp ~]#
vi /etc/ssh/sshd_config
# line 138 : comment out and add a line

#Subsystem      sftp    /usr/libexec/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 sshd

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

[root@dlp ~]#
usermod -G sftp_users rocky

[2] Verify working with a user set SFTP only setting.
[rocky@node01 ~]$
ssh dlp.srv.world

Enter passphrase for key '/home/rocky/.ssh/id_rsa':
This service allows sftp connections only.
Connection to dlp.srv.world closed.  
# denied normally
[rocky@node01 ~]$
sftp dlp.srv.world

Enter passphrase for key '/home/rocky/.ssh/id_rsa':
Connected to dlp.srv.world.
sftp>
ls -l

drwx------    3 rocky    rocky         111 Jul 16 06:06 rocky
sftp>
pwd

Remote working directory: /
sftp>
exit

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