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Jailed CI user

This is a running project at HSBXL. See other space projects.
If you want more info about this project, ask 'Askarel'.

Our setup for a jailed CI user.

For deploying this Hugo static website, we needed a ‘Jailed CI user’.
A SSH user which is limited to a set of commands and directories.

Create a regular user

# adduser --home /home/ci-jail/ci-jail --shell /bin/sh ci-jail

Install static busybox

# apt-get install busybox-static
# mkdir -p /home/ci-jail/dev /home/ci-jail/bin /home/ci-jail/www /home/ci-jail/ci-jail/.ssh /home/gitlab-jail/home/gitlab-jail
# ln -s /gitlab /home/gitlab-jail/home/gitlab-jail/gitlab

Copy busybox to it’s destination

# cp /bin/busybox /home/ci-jail/bin
# chroot /home/ci-jail /bin/busybox --install -s /bin

Add your ssh key to the jail

# echo 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC98TAUD9PPuzRj5uyHWlxZiXGLm1JI7T2hPNwmW9pU5V/guoJ90VTNQ7lugEoX8HYxB7JC0/RA5ogJBkhcQHIAMIGT6yM7F2zzVv9LadbiMU0KrB2dZVmPKKxi49uqqj+d8zIWTbm4tLf7xdF42kr7c2AUl1kYzaD1ymlAXSavvHTg7y/h2/mZ36F7WZmVwa7Q6iI5Vuca66lauwGgl1ETS2lwneQn+CWDZFMSFDT9TmphR8mpISi8063oTwvvHa/t0bpeQnKltg1iqM2YGTlIGTgXuEWsiAARfF96zhOUAXseA9WHeCTDUITmycFau4+ILxVH47Z6oC11W52BtwIf frederic@pekko' > /home/ci-jail/ci-jail/.ssh/authorized_keys

Set the permissions to the files and directories

# chown -R ci-jail:ci-jail /home/ci-jail/ci-jail
# chown -R ci-jail:ci-jail /home/ci-jail/www

Add the following to your sshd config (file /etc/ssh/sshd):

Match user ci-jail
	ChrootDirectory /home/ci-jail

Restart your ssh daemon

/etc/init.d/ssh restart

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