Add role service-bind-slave

inventory/group_vars/all

@@ -38,6 +38,15 @@ meshes:
     iface_mtu: 1350
     peers_mesh_repo: https://github.com/freifunk-mwu/peers-ffmz.git
     peers_intragate_repo: https://github.com/freifunk-mwu/ffmz-infrastructure-peers.git
+    dns:
+      master: fd37:b4dc:4b1e::a25:103
+      forward_zones:
+        ffmz.org:
+        user.ffmz.org:
+        bb.ffmz.org:
+        nodes.ffmz.org:
+        ffbin:
+          master: fd37:b4dc:4b1e::a25:10c
 
   wi:
     site_number: 56
@@ -60,6 +69,13 @@ meshes:
     iface_mtu: 1350
     peers_mesh_repo: https://github.com/freifunk-mwu/peers-ffwi.git
     peers_intragate_repo: https://github.com/freifunk-mwu/ffwi-infrastructure-peers.git
+    dns:
+      master: fd56:b4dc:4b1e::a38:103
+      forward_zones:
+        ffwi.org:
+        user.ffwi.org:
+        bb.ffwi.org:
+        nodes.ffwi.org:
 
 icvpn:
   prefix: mwu

playbooks/gateways.yml

@@ -25,5 +25,6 @@
     - service-bird
     - service-bird-icvpn
     - service-bird-ffrl
+    - service-bind-slave
     - service-rclocal
     - system-sysctl-gateway

roles/service-bind-slave/README.md

@@ -0,0 +1,39 @@
+# Ansible role service-bind-slave
+
+Diese Ansible role installiert und konfiguriert den DNS Server BIND auf einem Freifunk Gateway.
+Die Gateways agieren lediglich als Slave-DNS Server.
+
+- installiert BIND Pakete
+- schreibt named.conf + named.conf.options + named.conf.logging
+- schreibt named.conf.icvpn nur wenn noch nicht vorhanden
+- schreibt für jedes Mesh eine Konfigurationsdatei named.conf.$site_code
+  - Forward-Zones müssen im `meshes`-Dict angegeben werden
+  - Reverse DNS Zones werden automatisch aus den benutzten IP-Subnetzen erzeugt
+
+## Benötigte Variablen
+
+- Dictionary `meshes`
+´´´
+meshes:
+  xx:
+...
+    site_code: # string
+    ipv4_network:
+    ipv6:
+      ula:
+        - # ULA-Prefix
+        - ...
+    dns:
+      master: # IP-Adresse des DNS Masters
+      forward_zones:
+        $zone: # DNS-Domain
+          master: # optional: IP-Adresse des DNS Masters, wenn die vom übergeordneten abweicht.
+      
+´´´
+- Variable `icvpn_ipv4_transfer_net`
+- Variable `icvpn_ipv6_transfer_net`
+- Host Variable `magic`
+
+## Benötigte roles
+
+- git-repos

roles/service-bind-slave/handlers/main.yml

@@ -0,0 +1,9 @@
+---
+- name: reload systemd
+  systemd:
+    daemon_reload: yes
+
+- name: restart bind9
+  systemd:
+    name: bind9
+    state: restarted

roles/service-bind-slave/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - { role: git-repos }

roles/service-bind-slave/tasks/main.yml

@@ -0,0 +1,67 @@
+---
+- name: install dns server packages
+  apt:
+    name: "{{ item }}"
+    state: present
+  notify: reload systemd
+  with_items:
+    - bind9
+    - bind9-doc
+    - bind9utils
+
+- name: enable systemd unit bind9
+  systemd:
+    name: bind9
+    enabled: yes
+
+- name: write named.conf
+  template:
+    src: named.conf.j2
+    dest: /etc/bind/named.conf
+    owner: root
+    group: bind
+    mode: 0644
+  notify: restart bind9
+
+- name: write named.conf.options
+  template:
+    src: named.conf.options.j2
+    dest: /etc/bind/named.conf.options
+    owner: root
+    group: bind
+    mode: 0644
+  notify: restart bind9
+
+- name: write named.conf.logging
+  template:
+    src: named.conf.logging.j2
+    dest: /etc/bind/named.conf.logging
+    owner: root
+    group: bind
+    mode: 0644
+  notify: restart bind9
+
+- name: write named.conf for meshes
+  template:
+    src: named.conf.mesh.j2
+    dest: /etc/bind/named.conf.{{ item.value.site_code }}
+    owner: root
+    group: bind
+    mode: 0644
+  notify: restart bind9
+  with_dict: "{{ meshes }}"
+
+- name: write initial icvpn bind config
+  shell: /usr/bin/python3 /home/admin/clones/icvpn-scripts/mkdns -f bind -x mwu -x bingen -s /home/admin/clones/icvpn-meta > /etc/bind/named.conf.icvpn
+  args:
+    chdir: /home/admin/clones/icvpn-scripts
+    creates: /etc/bind/named.conf.icvpn
+  notify: restart bind9
+
+- name: set file attributes for icvpn config
+  file:
+    path: /etc/bind/
+    mode: 0644
+    owner: root
+    group: bird
+  notify: restart bind9

roles/service-bind-slave/templates/named.conf.j2

@@ -0,0 +1,11 @@
+//
+// {{ ansible_managed }}
+//
+
+include "/etc/bind/named.conf.options";
+include "/etc/bind/named.conf.default-zones";
+include "/etc/bind/named.conf.logging";
+{% for mesh_id, mesh_value in meshes.iteritems() %}
+include "/etc/bind/named.conf.{{ mesh_value.site_code }}";
+{% endfor %}
+include "/etc/bind/named.conf.icvpn";

roles/service-bind-slave/templates/named.conf.logging.j2

@@ -0,0 +1,9 @@
+//
+// {{ ansible_managed }}
+//
+
+logging {
+	channel null { null; };
+	category default { null; };
+};
+

roles/service-bind-slave/templates/named.conf.mesh.j2

@@ -0,0 +1,58 @@
+//
+// {{ ansible_managed }}
+//
+
+// ACLs
+masters "ns-master-{{ item.value.site_code }}" {
+	{{ item.value.dns.master }};
+};
+
+{% for zone_id, zone_value in item.value.dns.forward_zones.iteritems() %}
+{% if zone_value.master is defined %}
+masters "ns-master-{{ zone_id }}" {
+	{{ zone_value.master }};
+};
+
+{% endif %}
+{% endfor %}
+
+acl "intern-{{ item.value.site_code }}" {
+	{{ item.value.ipv4_network | ipaddr('net') | ipaddr('network/prefix') }};
+{% for prefix in item.value.ipv6.ula %}
+	{{ prefix | ipaddr('net') | ipaddr('network/prefix') }};
+{% endfor %}
+};
+
+// DNS forward zones for {{ item.value.site_code }}
+{% for zone_id, zone_value in item.value.dns.forward_zones.iteritems() %}
+zone "{{ zone_id }}." {
+	type slave;
+	file "{{ zone_id }}.db";
+{% if zone_value.master is defined %}
+	masters { ns-master-{{ zone_id }}; };
+{% else %}
+	masters { ns-master-{{ item.value.site_code }}; };
+{% endif %}
+};
+{% if not loop.last %}
+
+{% endif %}
+{% endfor %}
+
+// DNS reverse zones for {{ item.value.site_code }}
+zone "{{ item.value.ipv4_network | ipaddr('net') | ipaddr('revdns') }}" {
+	type slave;
+	file "{{ item.value.ipv4_network | ipaddr('net') | ipaddr('revdns') }}";
+	masters { ns-master-{{ item.value.site_code }}; };
+};
+
+{% for prefix in item.value.ipv6.ula %}
+zone "{{ prefix | ipaddr('net') | ipaddr('revdns') }}" {
+	type slave;
+	file "{{ prefix | ipaddr('net') | ipaddr('revdns') }}";
+	masters { ns-master-{{ item.value.site_code }}; };
+};
+{% if not loop.last %}
+
+{% endif %}
+{% endfor %}

roles/service-bind-slave/templates/named.conf.options.j2

@@ -0,0 +1,37 @@
+//
+// {{ ansible_managed }}
+//
+options {
+	directory "/var/cache/bind";
+
+	dnssec-validation no;
+	auth-nxdomain no;
+
+	allow-query { any; };
+	allow-recursion {
+		127.0.0.1;
+		::1;
+{% for mesh_id, mesh_value in meshes.iteritems() %}
+		intern-{{ mesh_value.site_code }};
+{% endfor %}
+	};
+	allow-transfer { any; };
+
+	listen-on {
+		127.0.0.1;
+{% for mesh_id, mesh_value in meshes.iteritems() %}
+		{{ mesh_value.ipv4_network | ipaddr('net') | ipaddr(magic) | ipaddr('address') }};
+{% endfor %}
+		{{ icvpn_ipv4_transfer_net | ipaddr('net') | ipsubnet(24, 37) | ipaddr(magic) | ipaddr('address') }};
+	};
+
+	listen-on-v6 {
+		::1;
+{% for mesh_id, mesh_value in meshes.iteritems() %}
+{% for ip in mesh_value.ipv6.ula %}
+		{{ ip | ipaddr('net') | ipsubnet(64, 0) | ipaddr(magic) }};
+{% endfor %}
+{% endfor %}
+		{{ icvpn_ipv6_transfer_net | ipaddr('net') | ipsubnet(112, 37) | ipaddr(magic) | ipaddr('address') }};
+	};
+};