RekomenciBackend/infrastructure/iac/ansible/roles/security/templates/nftables.conf.j2

#!/usr/sbin/nft -f

table inet filter {
    chain input {
        type filter hook input priority 0;
        policy {{ security_firewall_default_policy | default('drop') }};

        ct state established,related accept
        iifname lo accept

        # allow ICMP
        ip protocol icmp icmp type { echo-request, echo-reply, destination-unreachable, time-exceeded } accept
        ip6 nexthdr icmpv6 icmpv6 type { echo-request, echo-reply, destination-unreachable, packet-too-big, time-exceeded, parameter-problem } accept

{% for p in security_firewall_allowed_ports %}
{% set parts = p.split('/') %}
{% set port = parts[0] %}
{% set proto = parts[1] if parts|length > 1 else 'tcp' %}
        {{ proto }} dport {{ port }} accept
{% endfor %}

        reject with icmpx type port-unreachable
    }

    chain forward {
        type filter hook forward priority 0;
        policy accept;
    }

    chain output {
        type filter hook output priority 0;
        policy accept;
    }
}