railiance-infra/ansible/roles/base/tasks/main.yml

---
- name: Ensure base packages
  ansible.builtin.package:
    name:
      - apt-transport-https
      - ca-certificates
      - curl
      - git
      - vim
      - ufw
      - fail2ban
      - python3
      - python3-venv
    state: present
    update_cache: true

- name: Harden SSH
  ansible.builtin.copy:
    dest: /etc/ssh/sshd_config.d/10-hardening.conf
    owner: root
    group: root
    mode: '0644'
    content: |
      PasswordAuthentication no
      PermitRootLogin no
      PubkeyAuthentication yes

- name: Restart sshd
  ansible.builtin.service:
    name: ssh
    state: restarted

- name: Ensure .ssh directory exists for ops_bridge_user
  ansible.builtin.file:
    path: "/home/{{ ops_bridge_user | default('tegwick') }}/.ssh"
    state: directory
    owner: "{{ ops_bridge_user | default('tegwick') }}"
    group: "{{ ops_bridge_user | default('tegwick') }}"
    mode: '0700'

- name: Inject ops-bridge public key into authorized_keys
  ansible.posix.authorized_key:
    user: "{{ ops_bridge_user | default('tegwick') }}"
    key: "{{ ops_bridge_pubkey }}"
    comment: "ops-bridge@{{ inventory_hostname }}"
    state: present
  when: ops_bridge_pubkey is defined and ops_bridge_pubkey | length > 0

- name: Configure UFW default incoming policy
  ansible.builtin.ufw:
    state: enabled
    policy: deny
    direction: incoming

- name: Allow UFW routing (required for k3s flannel pod networking)
  ansible.builtin.ufw:
    policy: allow
    direction: routed

- name: Allow SSH in UFW
  ansible.builtin.ufw:
    rule: allow
    name: OpenSSH

# k3s API access is source-restricted. See roles/base/defaults/main.yml for why
# this is declared rather than hand-applied. Order matters below: grants are
# added BEFORE the blanket rule is removed, so convergence never opens a window
# in which the operator cannot reach the API.

- name: Allow k3s API from approved operator sources only
  ansible.builtin.ufw:
    rule: allow
    port: '6443'
    proto: tcp
    from_ip: "{{ item.address }}"
    comment: "{{ item.comment | default('k3s-api-operator') }}"
  loop: "{{ k3s_api_allowed_sources }}"
  loop_control:
    label: "{{ item.address }}"

- name: Remove blanket k3s API rule if present (must not be world-reachable)
  ansible.builtin.ufw:
    rule: allow
    port: '6443'
    proto: tcp
    delete: true

- name: Revoke k3s API access for retired operator sources
  ansible.builtin.ufw:
    rule: allow
    port: '6443'
    proto: tcp
    from_ip: "{{ item.address }}"
    delete: true
  loop: "{{ k3s_api_revoked_sources }}"
  loop_control:
    label: "{{ item.address }}"

- name: Warn when no operator source is allowed to reach the k3s API
  ansible.builtin.debug:
    msg: >-
      k3s_api_allowed_sources is empty, so 6443/tcp is closed to all external
      sources on this host. This is the safe default, not an error. SSH is
      unaffected and the host remains recoverable. Set the allowlist in
      inventory/group_vars/all.yaml to restore API access.
  when: k3s_api_allowed_sources | length == 0

- name: Allow Flannel VXLAN in UFW
  ansible.builtin.ufw:
    rule: allow
    port: '8472'
    proto: udp

- name: Enable fail2ban
  ansible.builtin.service:
    name: fail2ban
    state: started
    enabled: true

- name: Configure fail2ban SSH jail
  ansible.builtin.copy:
    dest: /etc/fail2ban/jail.d/sshd.conf
    owner: root
    group: root
    mode: '0644'
    content: |
      [sshd]
      enabled = true
      port    = ssh
      filter  = sshd
      maxretry = 5
      bantime  = 3600
      findtime = 600
  notify: Restart fail2ban

- name: Set HISTCONTROL to ignorespace
  ansible.builtin.copy:
    dest: /etc/profile.d/histcontrol.sh
    owner: root
    group: root
    mode: '0644'
    content: |
      export HISTCONTROL=ignorespace

- name: Set timezone
  community.general.timezone:
    name: "{{ timezone | default('UTC') }}"