add hardening playbook

hardening.yml

+---
+- hosts: new-host
+  become: true
+  tasks:
+        - name: Hardening Ubuntu OS: Disable IPv6
+          sysctl:
+            name: "{{ item.parameter }}"
+            state: present
+            value: "{{ item.value }}"
+          with_items:
+            - { parameter: net.ipv6.conf.all.disable_ipv6, value: 1 }
+            - { parameter: net.ipv6.conf.default.disable_ipv6, value: 1 }
+            - { parameter: net.ipv6.conf.lo.disable_ipv6, value: 1 }
+          
+        - name: Hardening Ubuntu OS: IP Spoofing protection
+          sysctl:
+            name: "{{ item.parameter }}"
+            state: present
+            value: "{{ item.value }}"
+          with_items:
+            - { parameter: net.ipv4.conf.all.rp_filter, value: 1 }
+            - { parameter: net.ipv4.conf.default.rp_filter, value: 1 }
+        
+        - name: Hardening Ubuntu OS: Block SYN attacks
+          sysctl:
+            name: "{{ item.parameter }}"
+            state: present
+            value: "{{ item.value }}"
+          with_items:
+            - { parameter: net.ipv4.tcp_syncookies, value: 1 }
+            - { parameter: net.ipv4.tcp_max_syn_backlog, value: 2048 }
+            - { parameter: net.ipv4.tcp_synack_retries, value: 2 }
+            - { parameter: net.ipv4.tcp_syn_retries, value: 5 }
+            
+        - name: Hardening Ubuntu OS: Ignore send redirects
+          sysctl:
+            name: "{{ item.parameter }}"
+            state: present
+            value: "{{ item.value }}"
+          with_items:
+            - { parameter: net.ipv4.conf.all.send_redirects, value: 0 }
+            - { parameter: net.ipv4.conf.default.send_redirects, value: 0 }
+            
+        - name: Hardening Ubuntu OS: Log Martians
+          sysctl:
+            name: "{{ item.parameter }}"
+            state: present
+            value: "{{ item.value }}"
+          with_items:
+            - { parameter: net.ipv4.conf.all.log_martians, value: 1 }
+            - { parameter: net.ipv4.icmp_ignore_bogus_error_responses, value: 1 }
+ 
\ No newline at end of file