From 06bfc41a5ce11b42040a4234c938582f1fab320e Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Tue, 4 Jun 2024 23:42:17 +0200
Subject: install coredns to ch-iot

---
 .../raspios/image/templates/firstrun.sh.j2         |  3 --
 roles/network/coredns/defaults/main.yml            |  5 +++
 roles/network/coredns/handlers/main.yml            |  5 +++
 roles/network/coredns/tasks/main.yml               | 40 ++++++++++++++++++++++
 roles/network/coredns/templates/coredns.service.j2 | 32 +++++++++++++++++
 5 files changed, 82 insertions(+), 3 deletions(-)
 create mode 100644 roles/network/coredns/defaults/main.yml
 create mode 100644 roles/network/coredns/handlers/main.yml
 create mode 100644 roles/network/coredns/tasks/main.yml
 create mode 100644 roles/network/coredns/templates/coredns.service.j2

(limited to 'roles')

diff --git a/roles/installer/raspios/image/templates/firstrun.sh.j2 b/roles/installer/raspios/image/templates/firstrun.sh.j2
index 05f9639d..ef90cf8b 100644
--- a/roles/installer/raspios/image/templates/firstrun.sh.j2
+++ b/roles/installer/raspios/image/templates/firstrun.sh.j2
@@ -88,9 +88,6 @@ systemctl disable wpa_supplicant.service
 rfkill unblock wlan
 ifup {{ network.primary.name }}
 {% endif %}
-{% for host in (network.static_hostnames | default([])) %}
-echo "{{ host.address }}  {{ host.names | join(' ') }}" >> /etc/hosts
-{% endfor %}
 
 {% if ansible_port != 22 %}
 sed -e 's/^\s*#*\s*Port\s\s*[0-9][0-9]*$/Port {{ ansible_port }}/' -i /etc/ssh/sshd_config
diff --git a/roles/network/coredns/defaults/main.yml b/roles/network/coredns/defaults/main.yml
new file mode 100644
index 00000000..b5294aa2
--- /dev/null
+++ b/roles/network/coredns/defaults/main.yml
@@ -0,0 +1,5 @@
+---
+# coredns_config: |
+#   . {
+#     whoami
+#   }
diff --git a/roles/network/coredns/handlers/main.yml b/roles/network/coredns/handlers/main.yml
new file mode 100644
index 00000000..13f60711
--- /dev/null
+++ b/roles/network/coredns/handlers/main.yml
@@ -0,0 +1,5 @@
+---
+- name: reload coredns
+  service:
+    name: coredns
+    state: reloaded
diff --git a/roles/network/coredns/tasks/main.yml b/roles/network/coredns/tasks/main.yml
new file mode 100644
index 00000000..a0cfa6c5
--- /dev/null
+++ b/roles/network/coredns/tasks/main.yml
@@ -0,0 +1,40 @@
+---
+- name: install coredns
+  apt:
+    name: coredns
+    state: present
+
+- name: create coredns user
+  user:
+    name: coredns
+    home: /nonexistent
+    shell: /usr/sbin/nologin
+    create_home: no
+    system: yes
+    state: present
+
+- name: create coredns config directory
+  file:
+    path: /etc/coredns
+    state: directory
+
+- name: generate Corefile
+  copy:
+    content: |
+      # ansible managed
+
+      {{ coredns_config }}
+    dest: /etc/coredns/Corefile
+  notify: reload coredns
+
+- name: install systemd service unit
+  template:
+    src: coredns.service.j2
+    dest: /etc/systemd/system/coredns.service
+
+- name: make sure coredns is enabled started
+  systemd:
+    daemon_reload: yes
+    name: coredns.service
+    enabled: yes
+    state: started
diff --git a/roles/network/coredns/templates/coredns.service.j2 b/roles/network/coredns/templates/coredns.service.j2
new file mode 100644
index 00000000..327f930b
--- /dev/null
+++ b/roles/network/coredns/templates/coredns.service.j2
@@ -0,0 +1,32 @@
+[Unit]
+Description=Coredns
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Restart=always
+User=coredns
+ExecStart=/usr/bin/coredns -conf /etc/coredns/Corefile
+ExecReload=/bin/kill -USR1 $MAINPID
+
+# systemd hardening-options
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+CapabilityBoundingSet=CAP_NET_BIND_SERVICE
+DeviceAllow=/dev/null rw
+DevicePolicy=strict
+LockPersonality=true
+MemoryDenyWriteExecute=true
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectControlGroups=true
+ProtectHome=true
+ProtectKernelModules=true
+ProtectKernelTunables=true
+ProtectSystem=strict
+RemoveIPC=true
+RestrictNamespaces=true
+RestrictRealtime=true
+SystemCallArchitectures=native
+
+[Install]
+WantedBy=multi-user.target
-- 
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