CentOS Stream 10
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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
Matched Content