Firewall interface mapping logic

Detect which interfaces belong to which zones, and configure firewalld
accordingly.
Backend zone is currently only prepared and yet to be tested and
enabled.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

pillar/global/init.sls

@@ -1,3 +1,5 @@
+{%- from slspath ~ '/map.jinja' import firewall_interfaces, public, internal, backend %}
+
 include:
   - role.salt.common
   - role.salt.minion
@@ -15,10 +17,15 @@ zypper:
 firewalld:
   zones:
     internal:
+      {{ firewall_interfaces(internal) }}
       ports:
         - comment: node_exporter
           port: 9200
           protocol: tcp
+    {%- if public | length %}
+    public:
+      {{ firewall_interfaces(public) }}
+    {%- endif %}
 {%- endif %}
 
 mine_functions:

pillar/global/macros.jinja

@@ -18,3 +18,9 @@
 - {{ ip }}
 {%- endfor %}
 {%- endmacro -%}
+
+{%- macro firewall_interfaces(interfaces) -%}
+{%- if interfaces | length -%}
+interfaces: {{ interfaces }}
+{%- endif -%}
+{%- endmacro -%}

pillar/global/map.jinja

@@ -0,0 +1,71 @@
+{%- from slspath ~ '/macros.jinja' import firewall_interfaces -%}
+{%- set firewall_interfaces = firewall_interfaces -%}
+{%- set minion = grains['id'] -%}
+
+{#- START Interface mapping logic -#}
+
+{%- set public = [] -%}
+{%- set internal = [] -%}
+{%- set backend = [] -%}
+
+{%- set internal6s = ('2a01:4f8:11e:2200') -%}
+{%- set backend6s = ('fd29:8e45:f292:ff80') -%}
+{#- to-do: get rid of illegal backend4s -#}
+{%- set backend4s = ('172.168.100') -%}
+{%- set excluded_interfaces = ('lo') -%}
+{%- set interfaces = salt.saltutil.runner('mine.get', tgt=minion, fun='network.interfaces', tgt_type='glob') -%}
+
+{%- if minion in interfaces -%}{%- for interface, ifconfig in interfaces[minion].items() -%}
+{%- if not interface.startswith(excluded_interfaces) -%}
+
+{%- for inetconf in ifconfig['inet'] -%}
+{%- set ip4 = inetconf['address'] -%}
+
+{%- if salt['network.is_private'](ip4) -%}
+
+{%- if not interface in internal -%}
+{%- do internal.append(interface) -%}
+{%- endif -%}
+
+{%- elif ip4.startswith(backend4s) -%}
+
+{%- if not interface in backend -%}
+{%- do backend.append(interface) -%}
+{%- endif -%}
+
+{%- else -%}
+
+{%- if not interface in public -%}
+{%- do public.append(interface) -%}
+{%- endif -%}
+
+{%- endif %}
+
+{%- endfor %}
+
+{%- if 'inet6' in interface -%}
+{%- for inet6conf in ifconfig['inet6'] -%}
+{%- set ip6 = inet6conf['address'] -%}
+
+{%- if ip6.startswith(internal6s) -%}
+
+{%- if not interface in internal -%}
+{%- do internal.append(interface) -%}
+{%- endif -%}
+
+{%- elif ip6.startswith(backend6s) -%}
+
+{%- if not interface in backend -%}
+{%- do backend.append(interface) -%}
+{%- endif -%}
+
+{%- endif -%}
+
+{%- endfor -%}
+{%- endif -%}
+
+{%- endif -%}
+{%- endfor -%}{%- endif -%}
+
+{#- END Interface mapping logic -#}
+