#
# IP Tables Firewall Rules for Kubernetes
# 
# Managed By ansible/role/nfc_kubernetes
#
# Dont edit this file directly as it will be overwritten. To grant a host API access
# edit the cluster config, adding the hostname/ip to path kubernetes_config.cluster.access
#
# This file is periodicly called by cron
#

{% set data = namespace(firewall_rules=[]) -%}

{%- if ansible_host is regex('^[a-z]') and ':' not in ansible_host -%} {#- Convert DNs name to IP Address -#}

  {%- if ipv6 | default(false) -%}

    {%- set ansible_host = query('community.dns.lookup', ansible_host + '.', type='AAAA' ) -%}

  {%- else -%}

    {%- set ansible_host = query('community.dns.lookup', ansible_host + '.', type='A' ) -%}

  {%- endif -%}

  {%- if ansible_host | list | length > 0 -%} {#- Convert dns lookup to list, and select the first item -#}
    {%- set ansible_host = ansible_host | from_yaml_all | list -%}

    {%- set ansible_host = ansible_host[0] -%}
  {%- endif -%}

{%- endif -%}

{%- for kubernetes_host in groups[kubernetes_config.cluster.group_name | default('me_is_optional')] | default([]) -%}

    {%- set kubernetes_host = hostvars[kubernetes_host].ansible_host -%}

    {%- if kubernetes_host is regex('^[a-z]') and ':' not in kubernetes_host -%} {#- Convert DNs name to IP Address -#}

      {%- if ipv6 | default(false) -%}

        {%- set kubernetes_host = query('community.dns.lookup', kubernetes_host + '.', type='AAAA' ) -%}

      {%- else -%}

        {%- set kubernetes_host = query('community.dns.lookup', kubernetes_host + '.', type='A' ) -%}

      {%- endif -%}

      {%- if 
        kubernetes_host is iterable
          and
        kubernetes_host is not string
        -%} {#- Convert dns lookup to list, and select the first item -#}
        {%- set kubernetes_host = kubernetes_host | from_yaml_all | list -%}

        {%- set kubernetes_host = kubernetes_host[0] | default('') -%} 
      {%- endif -%}

    {%- endif -%}

  {%- if kubernetes_host != '' -%}

    {%- for master_host in groups['kubernetes_master'] -%}

      {%- if master_host in groups[kubernetes_config.cluster.group_name | default('me_is_optional')] | default([]) -%}

        {%- set master_host = hostvars[master_host].ansible_host -%}

        {%- if master_host is regex('^[a-z]')  and ':' not in master_host -%} {#- Convert DNs name to IP Address -#}

          {%- if ipv6 | default(false) -%}

            {%- set master_host = query('community.dns.lookup', master_host + '.', type='AAAA' ) -%}

          {%- else -%}

            {%- set master_host = query('community.dns.lookup', master_host + '.', type='A' ) -%}

          {%- endif -%}
  
          {%- if master_host | list | length > 0 -%} {#- Convert dns lookup to list, and select the first item -#}
            {%- set master_host = master_host | from_yaml_all | list -%}

            {%- set master_host = master_host[0] -%} 
          {%- endif -%}

        {%- endif -%}


        {%- if nfc_role_kubernetes_master | default(false) | bool -%}

          {%- if 
              master_host == kubernetes_host
              and
              master_host != ansible_host
                and
              (
                (
                  ipv6 | default(false)
                    and
                  ':' in master_host
                )
                  or
                (
                  not ipv6 | default(false)
                    and
                  '.' in master_host
                )
              )
          -%}

              {#- master hosts only -#}

                {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-embedded-etcd -s ' + master_host + ' -j ACCEPT'] -%}
                {# {%- set data.firewall_rules = data.firewall_rules + ['-I INPUT -s ' + master_host + ' -p tcp -m multiport --dports 2380 -j ACCEPT'] -%} #}

                {%- if '-I kubernetes-api -s ' + master_host + ' -j ACCEPT' not in data.firewall_rules -%}

                  {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + master_host + ' -j ACCEPT'] -%}

                {%- endif -%}

          {%- endif -%}

        {%- endif -%}

      {%- endif -%}

    {%- endfor -%}

    {%- if 
      ansible_host != kubernetes_host
        and
      (
        (
          ipv6 | default(false)
            and
          ':' in kubernetes_host
        )
          or
        (
          not ipv6 | default(false)
            and
          '.' in kubernetes_host
        )
      )
    -%}

      {#- All cluster Hosts -#}


      {%- if nfc_role_kubernetes_master | default(false) | bool -%}

        {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- endif -%}

      {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-flannel-vxlan -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-kubelet-metrics -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-flannel-wg-four -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-flannel-wg-six -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-calico-bgp -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-calico-typha -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- if nfc_kubernetes_enable_metallb | default(false) -%}

        {%- set data.firewall_rules = data.firewall_rules + ['-I metallb-l2-tcp -s ' + kubernetes_host + ' -j ACCEPT'] -%}

        {%- set data.firewall_rules = data.firewall_rules + ['-I metallb-l2-udp -s ' + kubernetes_host + ' -j ACCEPT'] -%}

      {%- endif -%}

    {%- endif -%}

  {%- endif -%}

{%- endfor -%}

{%- if nfc_role_kubernetes_master | default(false) | bool -%}

  {%- if host_external_ip is defined -%}

    {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + host_external_ip + ' -m comment --comment "hosts configured external IP" -j ACCEPT'] -%}

  {%- endif -%}

  {%- for api_client in kubernetes_config.cluster.access | default([]) -%}

    {%- if api_client is regex('^[a-z]')  and ':' not in api_client -%} {#- Convert DNs name to IP Address -#}

      {%- set api_client_dns_name = api_client -%}

      {%- if ipv6 | default(false) -%}

        {%- set api_client = query('community.dns.lookup', api_client + '.', type='AAAA' ) -%}

      {%- else -%}

        {%- set api_client = query('community.dns.lookup', api_client + '.', type='A' ) -%}

      {%- endif -%}

      {%- if api_client | list | length > 0 -%} {#- Convert dns lookup to list, and select the first item -#}

        {%- set api_client = api_client | from_yaml_all | list -%}

        {%- set api_client = api_client[0] -%}

      {%- endif -%}

    {%- endif -%}


    {%- if
      api_client != ansible_host
        and
      (
        (
          ipv6 | default(false)
            and
          ':' in api_client
        )
          or
        (
          not ipv6 | default(false)
            and
          '.' in api_client
        )
      )
    -%}

      {#- Hosts allowed to access API -#}

      {%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + api_client + ' -m comment --comment "host: ' + api_client_dns_name | default(api_client) + '" -j ACCEPT'] -%}

    {%- endif -%}

  {%- endfor %}

{%- endif %}

*filter

{# -N kubernetes-embedded-etcd
-A kubernetes-embedded-etcd -j RETURN

-A INPUT -p tcp -m multiport --dports 2379,2380 -m comment --comment "etcd. Servers only" -j kubernetes-embedded-etcd


-N kubernetes-api
-A kubernetes-api -j RETURN

-A INPUT -p tcp --dport 6443 -m comment --comment "Kubernetes API access. All Cluster hosts and end users" -j kubernetes-api


-N kubernetes-flannel-vxlan
-A kubernetes-flannel-vxlan -j RETURN

-A INPUT -p udp --dport 8472 -m comment --comment "Flannel. All cluster hosts" -j kubernetes-flannel-vxlan


-N kubernetes-kubelet-metrics
-A kubernetes-kubelet-metrics -j RETURN

-A INPUT -p tcp --dport 10250 -m comment --comment "Kubernetes Metrics. All cluster hosts" -j kubernetes-kubelet-metrics


-N kubernetes-flannel-wg-four
-A kubernetes-flannel-wg-four -j RETURN

-A INPUT -p udp --dport 51820 -m comment --comment "Flannel Wiregaurd IPv4. All cluster hosts" -j kubernetes-flannel-wg-four


-N kubernetes-flannel-wg-six
-A kubernetes-flannel-wg-six -j RETURN

-A INPUT -p udp --dport 51821 -m comment --comment "Flannel Wiregaurd IPv6. All cluster hosts" -j kubernetes-flannel-wg-six #}


{% if data.firewall_rules | length | int > 0 -%}
{% for rule in data.firewall_rules -%}
{{ rule }}
{% endfor -%}
{% endif -%}

{#- #-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 6443 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 179 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 10250 -j ACCEPT

#-I INPUT -s 192.168.1.0/24 -p udp -m multiport --dports 4789 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 2379 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 2380 -j ACCEPT


-I INPUT -p tcp -m multiport --dports 6443 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 179 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 10250 -j ACCEPT

-I INPUT -p udp -m multiport --dports 4789 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 2379 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 2380 -j ACCEPT #}

COMMIT





{# iptables -I kubernetes-api -s nww-au1.networkedweb.com -j ACCEPT #}