Added initial script to harden SSH installs

playbooks/ssh_hardening.yml

@@ -0,0 +1,39 @@
+---
+- name: Harden SSH Configuration
+  hosts: all
+  become: true
+  vars:
+    # Set this to true in Semaphore to allow key-based root login
+    # If ALLOW_ROOT_SSH isn't in Semaphore, it defaults to 'false'
+    allow_root_ssh: "{{ ALLOW_ROOT__SSH | default(false) | bool }}"
+
+
+  tasks:
+    - name: Backup SSH config
+      ansible.builtin.copy:
+        src: /etc/ssh/sshd_config
+        dest: /etc/ssh/sshd_config.bak
+        remote_src: true
+        mode: '0600'
+
+    - name: Configure SSH Hardening
+      ansible.builtin.lineinfile:
+        path: /etc/ssh/sshd_config
+        regexp: "{{ item.regexp }}"
+        line: "{{ item.line }}"
+        state: present
+        validate: '/usr/sbin/sshd -t -f %s'
+      loop:
+        # Disables all password logins
+        - { regexp: '^#?PasswordAuthentication', line: "PasswordAuthentication no" }
+        # Allows root ONLY if they have a key
+        - { regexp: '^#?PermitRootLogin', line: "PermitRootLogin {{ 'prohibit-password' if allow_root_ssh else 'no' }}" }
+        # Ensures PubKey is definitely on
+        - { regexp: '^#?PubkeyAuthentication', line: "PubkeyAuthentication yes" }
+      notify: Restart SSH
+
+  handlers:
+    - name: Restart SSH
+      ansible.builtin.service:
+        name: ssh
+        state: restarted