Install and configure fail2ban

Closes #194 (closed)

Closes #170 (closed)

Closes #169 (closed)

Closes #171 (closed)

ansible/roles/fail2ban/tasks/main.yml

+---
+
+- name: Install fail2ban
+  ansible.builtin.package:
+    name: "{{ item }}"
+    state: present
+  loop:
+    - fail2ban
+    - fail2ban-firewalld
+
+- name: Configure fail2ban
+  ansible.builtin.template:
+    src: "{{ item.src }}"
+    dest: "{{ item.dest }}"
+    backup: true
+  loop:
+    - { src: 'jail.local.j2', dest: '/etc/fail2ban/jail.local' }
+    - { src: 'sshpiperd_filter.local.j2', dest: '/etc/fail2ban/filter.d/sshpiperd.local' }
+    - { src: 'sshpiperd_jail.local.j2', dest: '/etc/fail2ban/jail.d/sshpiperd.local' }
+
+- name: Activate the firewalld support for fail2ban
+  ansible.builtin.command:
+    cmd: mv /etc/fail2ban/jail.d/00-firewalld.conf /etc/fail2ban/jail.d/00-firewalld.local
+
+- name: Configure firewalld to allow ssh and sshpiper traffic
+  ansible.posix.firewalld:
+    port: "{{ item }}"
+    zone: public
+    state: enabled
+    permanent: true
+  loop:
+    - 2222/tcp
+    - 22/tcp
+
+- name: Enable and start firewalld
+  ansible.builtin.service:
+    name: firewalld
+    enabled: true
+    state: restarted
+
+- name: Enable and start fail2ban
+  ansible.builtin.service:
+    name: fail2ban
+    enabled: true
+    state: restarted
+