feat: add routed UFW rules for pod traffic and open NFS/SMB on nik-debian

Adds explicit UFW routed-allow rules (10.42.0.0/16 pod-to-pod, pod-to-Technitium
DNS) since these nodes default their routed/FORWARD policy to DROP. Also brings
nik-debian's NFS (2049) and SMB (445) ports under Ansible-managed UFW rules via
the existing nfs-server role, scoped to the Lab/Trusted networks that need them.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

ansible/group_vars/all/k3s.yaml

@@ -1,10 +1,13 @@
 ---
-# Vars for: K3s cluster-wide DNS resolver
+# Vars for: K3s cluster-wide DNS resolver and pod network
-# Applied by: ansible/roles/k3s-server, ansible/roles/k3s-agent
+# Applied by: ansible/roles/k3s-server, ansible/roles/k3s-agent, ansible/roles/common
 # Description: Single source of truth for the resolver IP written into
 #   /etc/rancher/k3s/resolv.conf on every K3s node, so CoreDNS's
 #   "forward . /etc/resolv.conf" always reaches Technitium regardless of
 #   which node CoreDNS is scheduled on, or that node's own (possibly stale)
-#   host resolvers.
+#   host resolvers. k3s_pod_cidr backs the routed UFW rules in the common
+#   role that allow Flannel pod-to-pod and pod-to-Technitium traffic through
+#   each node's routed/FORWARD chain.
 
 k3s_dns_resolver: 10.10.40.53
+k3s_pod_cidr: 10.42.0.0/16

ansible/roles/common/tasks/main.yaml

@@ -1,7 +1,7 @@
 ---
 # Part of role: common
 # Called by: ansible/playbooks/bootstrap-minisforum.yaml
-# Description: Sets timezone, installs base packages, creates user, hardens SSH, configures UFW, and creates data directories.
+# Description: Sets timezone, installs base packages, creates user, hardens SSH, configures UFW (including routed pod-to-pod/pod-to-Technitium rules), and creates data directories.
 
 - name: Set timezone
   community.general.timezone:
@@ -64,6 +64,27 @@
     comment: "{{ item.comment }}"
   loop: "{{ ufw_allowed_ports }}"
 
+- name: Allow routed pod-to-pod traffic (Flannel)
+  community.general.ufw:
+    rule: allow
+    route: true
+    src: "{{ k3s_pod_cidr }}"
+    dest: "{{ k3s_pod_cidr }}"
+    comment: K3s pod-to-pod (Flannel)
+
+- name: Allow routed pod traffic to Technitium DNS
+  community.general.ufw:
+    rule: allow
+    route: true
+    src: "{{ k3s_pod_cidr }}"
+    dest: "{{ k3s_dns_resolver }}"
+    port: "53"
+    proto: "{{ item }}"
+    comment: K3s pod DNS to Technitium
+  loop:
+    - tcp
+    - udp
+
 - name: Enable UFW
   community.general.ufw:
     state: enabled

ansible/roles/nfs-server/defaults/main.yaml

@@ -1,7 +1,11 @@
 ---
 # Part of role: nfs-server
 # Called by: ansible/playbooks/setup-nfs-debian.yaml
-# Description: Default variables for the nfs-server role including export path and allowed client IP.
+# Description: Default variables for the nfs-server role including export path, allowed client IP, and UFW-allowed SMB source networks.
 
 nfs_export_path: /mnt/storage
 nfs_allowed_ip: 10.10.40.53
+
+smb_allowed_subnets:
+  - 10.10.10.0/24
+  - 10.10.40.0/24

ansible/roles/nfs-server/tasks/main.yaml

@@ -1,7 +1,7 @@
 ---
 # Part of role: nfs-server
 # Called by: ansible/playbooks/setup-nfs-debian.yaml
-# Description: Installs NFS server, configures exports, and ensures the backup directory exists.
+# Description: Installs NFS server, configures exports, allows NFS/SMB through UFW, and ensures the backup directory exists.
 
 - name: Install NFS server
   ansible.builtin.apt:
@@ -29,6 +29,25 @@
     enabled: true
   become: true
 
+- name: Allow NFS access through UFW from the k3s server
+  community.general.ufw:
+    rule: allow
+    port: "2049"
+    proto: tcp
+    src: "{{ nfs_allowed_ip }}"
+    comment: NFS from k3s server
+  become: true
+
+- name: Allow SMB access through UFW from trusted networks
+  community.general.ufw:
+    rule: allow
+    port: "445"
+    proto: tcp
+    src: "{{ item }}"
+    comment: SMB (Samba)
+  loop: "{{ smb_allowed_subnets }}"
+  become: true
+
 - name: Ensure backup directory exists with correct ownership
   ansible.builtin.file:
     path: /home/nik/backups/gitea