OpenSSH : SFTP only + Chroot2019/05/06

	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 -aG 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 May  1 15:58 fedora
drwx------    3 1001     1001           95 May  1 16:05 redhat

sftp>

pwd

Remote working directory: /
sftp>

exit

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