hardening.yml
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---
- 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 }