✨: DNSSEC signing and auto-signing

roles/nsd/tasks/cron.yml

@@ -0,0 +1,18 @@
+---
+
+- name: Install cron script
+  ansible.builtin.template:
+    src: resignall.sh.j2
+    dest: "{{ nsd_cron_script }}"
+    owner: root
+    group: root
+    mode: "0o750"
+
+- name: Install cron
+  ansible.builtin.cron:
+    name: "NSD zone resign"
+    hour: "3"
+    minute: "2"
+    weekday: "3"
+    job: "{{ nsd_cron_script }} &> /dev/null"
+    state: present

roles/nsd/tasks/main.yml

@@ -16,11 +16,19 @@
 - name: Create zone dir
   ansible.builtin.file:
     path: "{{ nsd_default_etc_path }}zones"
-    owner: root
-    group: root
+    owner: nsd
+    group: nsd
     mode: "0o755"
     state: directory
 
+- name: Create key dir
+  ansible.builtin.file:
+    path: "{{ nsd_default_etc_path }}keys"
+    owner: nsd
+    group: nsd
+    mode: "0o700"
+    state: directory
+
 - name: Create nsd.conf
   ansible.builtin.template:
     src: nsd.conf.j2
@@ -50,6 +58,10 @@
   loop: "{{ zones }}"
   when: nsd_master
 
+- name: Install renew cron
+  ansible.builtin.include_tasks: cron.yml
+  when: nsd_master
+
 - name: Ensure nsd is started
   ansible.builtin.service:
     name: nsd

roles/nsd/tasks/prerequisites.yml

@@ -25,4 +25,5 @@
       - nsd
       - dnsutils
       - ldnsutils
+      - cron
     state: present

roles/nsd/tasks/zones.yml

@@ -4,24 +4,47 @@
   ansible.builtin.template:
     src: "{{ 'zones/parking.zone.j2' if item.parking | default(false) else 'zones/' ~ item.name ~ '.zone.j2' }}"
     dest: "{{ nsd_default_etc_path }}zones/{{ item.name }}.zone"
-    owner: root
-    group: root
+    owner: nsd
+    group: nsd
     mode: "0o644"
   vars:
     # This generates 99 different serial per day
     dns_serial: "{{ ansible_date_time.epoch }}"
 
-- name: Force zone file modification time
+- name: Create zone key dir
   ansible.builtin.file:
-    path: "{{ nsd_default_etc_path }}zones/{{ item.name }}.zone"
-    state: touch
-    mode: "0o644"
+    path: "{{ nsd_default_etc_path }}keys/{{ item.name }}/"
+    owner: nsd
+    group: nsd
+    mode: "0o750"
+    state: directory
+
+- name: Create the associated keys
+  become: true
+  become_user: nsd
+  ansible.builtin.command:
+    cmd: "ldns-keygen -a ECDSAP256SHA256 -k -s {{ item.name }}"
+    chdir: "{{ nsd_default_etc_path }}/keys/{{ item.name }}/"
+    creates: "{{ nsd_default_etc_path }}/keys/{{ item.name }}/.ds"
 
 - name: Check zone file
   ansible.builtin.command:
     cmd: "nsd-checkzone {{ item.name }} {{ nsd_default_etc_path }}zones/{{ item.name }}.zone"
   changed_when: false
 
+- name: Stat associated keys
+  ansible.builtin.stat:
+    path: "{{ nsd_default_etc_path }}/keys/{{ item.name }}/.ds"
+  register: _stat_keys
+
+- name: Sign zone file
+  become: true
+  become_user: nsd
+  ansible.builtin.command:
+    chdir: "{{ nsd_default_etc_path }}/keys/{{ item.name }}/"
+    cmd: "ldns-signzone -o {{ item.name }} -u {{ nsd_default_etc_path }}/zones/{{ item.name }}.zone {{ (_stat_keys.stat.lnk_target | split('.'))[:-1] | join('.') }}"
+  changed_when: true
+
 - name: Reload zone
   ansible.builtin.command:
     cmd: "nsd-control reload {{ item.name }}"

roles/nsd/templates/resignall.sh.j2

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+for i in {{ nsd_default_etc_path }}keys/*/*.ds
+do
+	# Get the different names
+	FILENAME=${i##*/}
+	KEYNAME=${FILENAME/.ds/}
+	DIRPATH=${i/${FILENAME}/}
+	_ZONEFILEPATH=${DIRPATH/keys/zones}
+	ZONEFILEPATH=${_ZONEFILEPATH%/*}.zone
+	_ZONENAME=${_ZONEFILEPATH%/*}
+	ZONENAME=${_ZONENAME##*/}
+
+	cd $DIRPATH
+	sudo -u nsd /usr/bin/ldns-signzone -o ${ZONENAME} -u ${ZONEFILEPATH} ${KEYNAME}
+	/usr/sbin/nsd-control reload ${ZONENAME}
+done

roles/nsd/templates/zone.j2

@@ -3,7 +3,7 @@
 {% set default_ipv6 = hostvars[other_server].ansible_default_ipv6.address -%}
 zone:
     name: "{{ item.name }}"
-    zonefile: {{ item.name }}.zone
+    zonefile: {{ item.name }}.zone.signed
     {% if nsd_master -%}
     {% for server in other_server -%}
     {% set default_ipv4 = hostvars[server].natted_ipv4 | default(hostvars[server].ansible_default_ipv4.address) -%}

roles/nsd/templates/zones/parking.zone.j2

@@ -14,6 +14,7 @@ $TTL 86400
 $ORIGIN {{ item.name }}.
 $TTL 7200
 @			CAA	0 issue ";"
+@			MX	0 .
 @			TXT	"v=spf1 -all"
 @			TXT	"spf2.0/mfrom -all"
 _dmarc		TXT	"v=DMARC1;p=reject;pct=100;sp=reject;aspf=s;"

roles/nsd/vars/main.yml

@@ -2,3 +2,4 @@
 
 nsd_default_etc_path: "/etc/nsd/"
 nsd_tsig_key_name: "tsig0"
+nsd_cron_script: /usr/local/bin/resignall.sh