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

---
- name: Ensure base packages
  tags: [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
  tags: [base, 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
  notify: Restart sshd

- name: Ensure .ssh directory exists for ops_bridge_user
  tags: [base, ssh]
  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
  tags: [base, ssh]
  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
  tags: [base, firewall, ufw]
  ansible.builtin.ufw:
    state: enabled
    policy: deny
    direction: incoming
  when: ufw_manage | bool

- name: Allow UFW routing when VXLAN peers are declared
  tags: [base, firewall, ufw]
  ansible.builtin.ufw:
    policy: allow
    direction: routed
  when: ufw_manage | bool and (flannel_vxlan_allowed_sources | length > 0)

- name: Allow SSH in UFW
  tags: [base, firewall, ufw]
  ansible.builtin.ufw:
    rule: allow
    name: OpenSSH
  when: ufw_manage | bool

- name: Allow declared extra UFW ports
  tags: [base, firewall, ufw]
  ansible.builtin.ufw:
    rule: allow
    port: "{{ item.port }}"
    proto: "{{ item.proto | default('tcp') }}"
    comment: "{{ item.comment | default('extra-allow') }}"
  loop: "{{ ufw_extra_allowed }}"
  loop_control:
    label: "{{ item.port }}/{{ item.proto | default('tcp') }}"
  when: ufw_manage | bool

# k3s API access is source-restricted and empty by default (tunnel-only).
# See roles/base/defaults/main.yml and docs/adr/ADR-005-k3s-api-tunnel-only.md.
# Order matters: remaining grants (if any) are added BEFORE the blanket rule
# is removed, so a non-empty allowlist never opens a window without API access.

- name: Allow k3s API from approved operator sources only
  tags: [base, firewall, ufw]
  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 }}"
  when: ufw_manage | bool

- name: Remove blanket k3s API rule if present (must not be world-reachable)
  tags: [base, firewall, ufw]
  ansible.builtin.ufw:
    rule: allow
    port: '6443'
    proto: tcp
    delete: true
  when: ufw_manage | bool

- name: Revoke k3s API access for retired operator sources
  tags: [base, firewall, ufw]
  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 }}"
  when: ufw_manage | bool

- name: Warn when no operator source is allowed to reach the k3s API
  tags: [base, firewall, ufw]
  ansible.builtin.debug:
    msg: >-
      k3s_api_allowed_sources is empty, so 6443/tcp is closed to all external
      sources on this host. Reach the API over the ops-bridge tunnel
      (k3s-api-railiance01 on 16444, k3s-api-coulombcore on 16443). SSH is
      unaffected and the host remains recoverable.
  when: ufw_manage | bool and (k3s_api_allowed_sources | length == 0)

- name: Allow Flannel VXLAN from declared cluster peers only
  tags: [base, firewall, ufw]
  ansible.builtin.ufw:
    rule: allow
    port: '8472'
    proto: udp
    from_ip: "{{ item.address }}"
    comment: "{{ item.comment | default('flannel-vxlan-peer') }}"
  loop: "{{ flannel_vxlan_allowed_sources }}"
  loop_control:
    label: "{{ item.address }}"
  when: ufw_manage | bool

- name: Remove blanket Flannel VXLAN rule if present (must not be world-reachable)
  tags: [base, firewall, ufw]
  ansible.builtin.ufw:
    rule: allow
    port: '8472'
    proto: udp
    delete: true
  when: ufw_manage | bool

- name: Enable fail2ban
  tags: [base, fail2ban]
  ansible.builtin.service:
    name: fail2ban
    state: started
    enabled: true

- name: Configure fail2ban SSH jail
  tags: [base, fail2ban]
  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
  tags: [base, histcontrol]
  ansible.builtin.copy:
    dest: /etc/profile.d/histcontrol.sh
    owner: root
    group: root
    mode: '0644'
    content: |
      export HISTCONTROL=ignorespace

- name: Set timezone
  tags: [base, timezone]
  community.general.timezone:
    name: "{{ timezone | default('UTC') }}"