ssh_chroot_jail

Ansible role ssh_chroot_jail

Simple SSH chroot jail management.

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Example Playbook

This example is taken from molecule/default/converge.yml and is tested on each push, pull request and release.

---
- name: Converge
  hosts: all
  become: true

  vars:
    ssh_chroot_l2chroot_path: /usr/bin/l2chroot
    ssh_chroot_jail_users:
      - name: foo
        home: /home/foo
        shell: /bin/bash

  roles:
    - role: buluma.ssh_chroot_jail

The machine needs to be prepared. In CI this is done using molecule/default/prepare.yml:

---
- name: Prepare
  hosts: all
  become: yes
  gather_facts: no

  roles:
    - role: buluma.bootstrap

Also see a full explanation and example on how to use these roles.

Role Variables

The default values for the variables are set in defaults/main.yml:

---
ssh_chroot_jail_path: /var/jail

ssh_chroot_jail_group_name: ssh_jailed

ssh_chroot_jail_users: []

ssh_chroot_jail_dirs:
  - bin
  - dev
  - etc
  - lib
  - lib64
  - usr/bin
  - usr/lib
  - usr/lib64
  - home

# can include type: c, b, p
# c = char device (unbuffered) [the default]
# b = block device (buffered)
# p = FIFO device
# anything else may result in errors with mknod or systemd-tmpfiles
ssh_chroot_jail_devs:
  - {dev: 'null', major: '1', minor: '3'}
  - {dev: 'random', major: '5', minor: '0'}
  - {dev: 'urandom', major: '1', minor: '5'}
  - {dev: 'zero', major: '1', minor: '8'}

ssh_chroot_tmpfiles_conf_path: /etc/tmpfiles.d/ssh-chroot.conf

ssh_chroot_bins:
  - /bin/cp
  - /bin/sh
  - /bin/bash
  - /bin/ls
  - /bin/rm
  - /bin/cat
  - /bin/grep
  - /bin/sed
  - /bin/chmod
  - /bin/chown
  - /bin/ed
  - /bin/nano
  - /usr/bin/tail
  - /usr/bin/head
  - /usr/bin/awk
  - /usr/bin/wc
  - /usr/bin/sort
  - /usr/bin/uniq
  - /usr/bin/cut
  - /usr/bin/scp
  - /usr/bin/tee
  - /usr/bin/touch
  - /usr/bin/vim
  - /usr/bin/vi
  - /usr/bin/dircolors
  - /usr/bin/tput
  - /usr/bin/free
  - /usr/bin/top
  - /usr/bin/find
  - bin: /usr/bin/which
    l2chroot: false
  - /usr/bin/id
  - /usr/bin/whoami
  - /usr/bin/groups
  # Can also set mode, e.g. to setuid or set different permissions.
  # - bin: /bin/ping
  #   mode: 4755

ssh_chroot_l2chroot_template: l2chroot.j2
ssh_chroot_l2chroot_path: /usr/local/bin/l2chroot

ssh_chroot_copy_extra_items:
  - /etc/hosts
  - /etc/passwd
  - /etc/group
  - /etc/ld.so.cache
  - /etc/ld.so.conf
  - /etc/nsswitch.conf

ssh_chroot_sshd_chroot_jail_config: |
  Match group {{ ssh_chroot_jail_group_name }}
      ChrootDirectory {{ ssh_chroot_jail_path }}
      X11Forwarding no
      AllowTcpForwarding no

ssh_chroot_jail_dirs_recurse: true