Add guest playbooks: ssh hardening, reboot check, auto updates, service check, guest agent, admin user
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JEczyvRjfakkiDNkbZA7PR
This commit is contained in:
Harwinder Sekhon
@@ -0,0 +1,209 @@
|
||||
---
|
||||
# Hardens sshd on every reachable Ubuntu/Rocky guest and turns on a fail2ban
|
||||
# sshd jail. Settings go into /etc/ssh/sshd_config.d/00-ansible.conf, which
|
||||
# sorts first and therefore wins over anything in sshd_config or the
|
||||
# cloud-init drop-in (sshd keeps the first value it sees for each option).
|
||||
#
|
||||
# Lockout guard: password authentication is only disabled on hosts where
|
||||
# root already has at least one authorized key.
|
||||
#
|
||||
# Extra vars (optional):
|
||||
# ssh_disable_password_auth - default true
|
||||
# ssh_max_auth_tries - default 4
|
||||
|
||||
- name: Check Host Availability
|
||||
hosts: ubuntu:rocky
|
||||
gather_facts: false
|
||||
ignore_unreachable: true
|
||||
|
||||
tasks:
|
||||
- name: Ping hosts to check availability
|
||||
ansible.builtin.ping:
|
||||
register: ping_result
|
||||
ignore_errors: true
|
||||
ignore_unreachable: true
|
||||
|
||||
- name: Add reachable hosts to group
|
||||
ansible.builtin.group_by:
|
||||
key: reachable_hosts
|
||||
when: ping_result is succeeded
|
||||
|
||||
- name: Report offline hosts
|
||||
ansible.builtin.debug:
|
||||
msg: "{{ inventory_hostname }} - OFFLINE"
|
||||
when: ping_result is not succeeded
|
||||
delegate_to: localhost
|
||||
|
||||
- name: SSH Hardening - Install fail2ban on Ubuntu
|
||||
hosts: ubuntu:&reachable_hosts
|
||||
become: true
|
||||
gather_facts: false
|
||||
|
||||
tasks:
|
||||
- name: Install fail2ban and nftables via apt
|
||||
ansible.builtin.apt:
|
||||
name:
|
||||
- fail2ban
|
||||
- nftables
|
||||
state: present
|
||||
update_cache: true
|
||||
cache_valid_time: 3600
|
||||
|
||||
- name: SSH Hardening - Install fail2ban on Rocky Linux
|
||||
hosts: rocky:&reachable_hosts
|
||||
become: true
|
||||
gather_facts: false
|
||||
|
||||
tasks:
|
||||
- name: Ensure EPEL repo is enabled
|
||||
ansible.builtin.dnf:
|
||||
name: epel-release
|
||||
state: present
|
||||
|
||||
- name: Install fail2ban and nftables via dnf
|
||||
ansible.builtin.dnf:
|
||||
name:
|
||||
- fail2ban
|
||||
- nftables
|
||||
state: present
|
||||
|
||||
- name: SSH Hardening - Configure sshd and fail2ban
|
||||
hosts: reachable_hosts
|
||||
become: true
|
||||
gather_facts: false
|
||||
|
||||
vars:
|
||||
ssh_disable_password_auth: true
|
||||
ssh_max_auth_tries: 4
|
||||
sshd_dropin_path: /etc/ssh/sshd_config.d/00-ansible.conf
|
||||
|
||||
tasks:
|
||||
- name: Count public keys in root's authorized_keys
|
||||
ansible.builtin.command: grep -cE '^(ssh-|ecdsa-|sk-)' /root/.ssh/authorized_keys
|
||||
register: key_count
|
||||
failed_when: false
|
||||
changed_when: false
|
||||
|
||||
- name: Decide whether password authentication can be disabled
|
||||
ansible.builtin.set_fact:
|
||||
has_keys: "{{ key_count.rc == 0 and (key_count.stdout | int) > 0 }}"
|
||||
|
||||
- name: Warn when root has no authorized keys
|
||||
ansible.builtin.debug:
|
||||
msg: "WARNING: no authorized keys for root on {{ inventory_hostname }} - password authentication stays enabled"
|
||||
when: not has_keys
|
||||
|
||||
- name: Ensure sshd_config.d directory exists
|
||||
ansible.builtin.file:
|
||||
path: /etc/ssh/sshd_config.d
|
||||
state: directory
|
||||
owner: root
|
||||
group: root
|
||||
mode: '0755'
|
||||
|
||||
- name: Ensure sshd_config includes the drop-in directory
|
||||
ansible.builtin.lineinfile:
|
||||
path: /etc/ssh/sshd_config
|
||||
regexp: '^Include\s+/etc/ssh/sshd_config\.d/\*\.conf'
|
||||
line: 'Include /etc/ssh/sshd_config.d/*.conf'
|
||||
insertbefore: BOF
|
||||
backup: true
|
||||
register: sshd_include
|
||||
|
||||
- name: Write sshd hardening drop-in
|
||||
ansible.builtin.copy:
|
||||
dest: "{{ sshd_dropin_path }}"
|
||||
content: |
|
||||
# Managed by Ansible (playbooks/ssh_harden.yml) - do not edit by hand
|
||||
PermitRootLogin prohibit-password
|
||||
PubkeyAuthentication yes
|
||||
PasswordAuthentication {{ 'no' if (has_keys and ssh_disable_password_auth | bool) else 'yes' }}
|
||||
KbdInteractiveAuthentication no
|
||||
MaxAuthTries {{ ssh_max_auth_tries }}
|
||||
X11Forwarding no
|
||||
owner: root
|
||||
group: root
|
||||
mode: '0600'
|
||||
validate: /usr/sbin/sshd -t -f %s
|
||||
register: sshd_dropin
|
||||
|
||||
- name: Record whether sshd needs a restart
|
||||
ansible.builtin.set_fact:
|
||||
sshd_changed: "{{ sshd_include is changed or sshd_dropin is changed }}"
|
||||
|
||||
- name: Configure fail2ban sshd jail
|
||||
ansible.builtin.copy:
|
||||
dest: /etc/fail2ban/jail.d/sshd.local
|
||||
content: |
|
||||
# Managed by Ansible (playbooks/ssh_harden.yml)
|
||||
[sshd]
|
||||
enabled = true
|
||||
backend = systemd
|
||||
banaction = nftables-multiport
|
||||
maxretry = 5
|
||||
findtime = 10m
|
||||
bantime = 1h
|
||||
owner: root
|
||||
group: root
|
||||
mode: '0644'
|
||||
register: f2b_jail
|
||||
|
||||
- name: Ensure fail2ban is enabled and running
|
||||
ansible.builtin.systemd:
|
||||
name: fail2ban
|
||||
enabled: true
|
||||
state: "{{ 'restarted' if f2b_jail is changed else 'started' }}"
|
||||
|
||||
- name: SSH Hardening - Restart SSH on Ubuntu
|
||||
hosts: ubuntu:&reachable_hosts
|
||||
become: true
|
||||
gather_facts: false
|
||||
|
||||
tasks:
|
||||
- name: Restart ssh service
|
||||
ansible.builtin.service:
|
||||
name: ssh
|
||||
state: restarted
|
||||
when: sshd_changed | bool
|
||||
|
||||
- name: SSH Hardening - Restart SSH on Rocky Linux
|
||||
hosts: rocky:&reachable_hosts
|
||||
become: true
|
||||
gather_facts: false
|
||||
|
||||
tasks:
|
||||
- name: Restart sshd service
|
||||
ansible.builtin.service:
|
||||
name: sshd
|
||||
state: restarted
|
||||
when: sshd_changed | bool
|
||||
|
||||
- name: SSH Hardening - Verify access
|
||||
hosts: reachable_hosts
|
||||
become: true
|
||||
gather_facts: false
|
||||
|
||||
tasks:
|
||||
- name: Drop the cached SSH connection so the next task performs a fresh login
|
||||
ansible.builtin.meta: reset_connection
|
||||
|
||||
- name: Confirm key-based login still works
|
||||
ansible.builtin.ping:
|
||||
|
||||
- name: Read fail2ban sshd jail status
|
||||
ansible.builtin.command: fail2ban-client status sshd
|
||||
register: f2b_status
|
||||
changed_when: false
|
||||
failed_when: false
|
||||
|
||||
- name: Summary
|
||||
ansible.builtin.debug:
|
||||
msg: |
|
||||
======================================================
|
||||
HOST: {{ inventory_hostname }} ({{ ansible_host }})
|
||||
======================================================
|
||||
PASSWORD AUTH: {{ 'disabled' if (has_keys and ssh_disable_password_auth | default(true) | bool) else 'ENABLED' }}
|
||||
ROOT KEYS: {{ key_count.stdout if key_count.rc == 0 else 0 }}
|
||||
SSHD: {{ 'restarted' if sshd_changed | bool else 'unchanged' }}
|
||||
FAIL2BAN: {{ 'sshd jail active' if f2b_status.rc == 0 else 'WARNING: jail not reporting (' ~ (f2b_status.stderr | default('') | trim) ~ ')' }}
|
||||
======================================================
|
||||
Reference in New Issue
Block a user