Fedora 29
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OpenSSH : SFTP only + Chroot
2018/11/02
 
Configure SFTP only + Chroot.
Some users who are applied this settings can access only with SFTP and access to the permitted directories.
[1] For example, Set /home as the Chroot directory.
# create a group for SFTP

[root@dlp ~]#
groupadd sftp_users

# for example, apply to a user [fedora] for SFTP only

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

[root@dlp ~]#
vi /etc/ssh/sshd_config
# line 142: comment out and add a line like below

#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

[2] Try to access with a user to verify settings.
[root@rx-7 ~]#
ssh fedora@10.0.0.30

fedora@10.0.0.30's password:
This service allows sftp connections only.
Connection to 10.0.0.30 closed.    
# denied normally
[root@rx-7 ~]#
sftp fedora@10.0.0.30

Connecting to 10.0.0.30...
fedora@10.0.0.30's password:
sftp>
ls -l

drwx------    3 1000     1000           95 Nov  1 15:58 fedora
drwx------    3 1001     1001           95 Nov  1 16:05 redhat
sftp>
pwd

Remote working directory: /
sftp>
exit

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