CentOS 8
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OpenSSH : SFTP only + Chroot
2019/09/30
 
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 142: 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 [cent] user as SFTP only user

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

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

cent@dlp.srv.world's password:
This service allows sftp connections only.
Connection to dlp.srv.world closed.  
# denied normally
[cent@node01 ~]$
sftp dlp.srv.world

cent@dlp.srv.world's password:
Connected to dlp.srv.world. sftp>
ls -l

drwx------    3 cent     cent           95 Sep 29 11:34 cent
sftp>
pwd

Remote working directory: /
sftp>
exit

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