feat(paperless): restrict FTP and Syncthing LB ingress to their client networks

ftp-scanner and syncthing-sync accepted any world source.

- ftp-scanner: IoT and Privat. Over the last 7 days the vsftpd log shows
  uploads from the BR5C scanner via fd02:30:: and the Brother via
  10.2.50.170.
- syncthing-sync: Privat and VPN. Over the last 7 days peers connected
  from 10.2.50.0/24 and fd02:50::/64.

host and remote-node stay allowed. Both LBs are ETP=Local.

Refs S28-19

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kubernetes/infrastructure/network-policies/cidr-groups.yaml

@@ -0,0 +1,150 @@
+# Client networks as Cilium CIDR groups, referenced from CNPs via
+# fromCIDRSet.cidrGroupRef. ULA + IPv4 only: the ISP-delegated GUA prefixes
+# change and are not listed.
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-default
+spec:
+  externalCIDRs:
+    - fd00::/64
+    - 192.168.8.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-management
+spec:
+  externalCIDRs:
+    - fd02:10::/64
+    - 10.2.10.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-radius
+spec:
+  externalCIDRs:
+    - fd02:11::/64
+    - 10.2.11.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-video
+spec:
+  externalCIDRs:
+    - 10.2.20.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-iot
+spec:
+  externalCIDRs:
+    - fd02:30::/64
+    - 10.2.30.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-server
+spec:
+  externalCIDRs:
+    - fd02:40::/64
+    - fd40::/64
+    - 10.2.40.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-k8s-node
+spec:
+  externalCIDRs:
+    - fd02:46::/64
+    - 10.2.46.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-k8s-ingress
+spec:
+  externalCIDRs:
+    - fd02:47::/64
+    - 10.2.47.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-k8s-pod
+spec:
+  externalCIDRs:
+    - fd02:48::/64
+    - 10.2.48.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-privat
+spec:
+  externalCIDRs:
+    - fd02:50::/64
+    - 10.2.50.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-phone
+spec:
+  externalCIDRs:
+    - 10.2.60.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-access
+spec:
+  externalCIDRs:
+    - 10.2.70.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-vpn
+spec:
+  externalCIDRs:
+    - 10.2.80.0/24
+    - 192.168.32.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-guest
+spec:
+  externalCIDRs:
+    - 10.2.90.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-multi-transfer
+spec:
+  externalCIDRs:
+    - 10.2.122.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-multi-lan
+spec:
+  externalCIDRs:
+    - 10.2.123.0/24
+---
+apiVersion: cilium.io/v2
+kind: CiliumCIDRGroup
+metadata:
+  name: net-mutti
+spec:
+  externalCIDRs:
+    - 10.2.200.0/24

kubernetes/infrastructure/network-policies/kustomization.yaml

@@ -1,6 +1,7 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
+  - cidr-groups.yaml
   - default-deny.yaml
   - allow-ingress.yaml
   - ingress-isolation.yaml

kubernetes/infrastructure/network-policies/paperless-ns.yaml

@@ -112,7 +112,7 @@ spec:
             - { type: 136, family: IPv6 }
             - { type: 143, family: IPv6 }
 ---
-# Allow FTP access (from scanners on the LAN) to the ftp-scanner pod.
+# FTP from the scanners (IoT and Privat) to the ftp-scanner pod.
 apiVersion: cilium.io/v2
 kind: CiliumNetworkPolicy
 metadata:
@@ -123,8 +123,24 @@ spec:
     matchLabels:
       app.kubernetes.io/name: ftp-scanner
   ingress:
+    - fromCIDRSet:
+        - cidrGroupRef: net-iot
+        - cidrGroupRef: net-privat
+      toPorts:
+        - ports:
+            - port: "21"
+              protocol: TCP
+            - port: "21100"
+              protocol: TCP
+            - port: "21101"
+              protocol: TCP
+            - port: "21102"
+              protocol: TCP
+            - port: "21103"
+              protocol: TCP
+            - port: "21104"
+              protocol: TCP
     - fromEntities:
-        - world
         - host
         - remote-node
       toPorts:
@@ -142,7 +158,7 @@ spec:
             - port: "21104"
               protocol: TCP
 ---
-# Allow Syncthing peer-to-peer sync from the LAN/world.
+# Allow Syncthing peer-to-peer sync from Privat and VPN.
 # - 22000 TCP+QUIC: actual sync traffic between peers.
 # - 21027 UDP: local-discovery broadcast packets from peers on the LAN.
 # UI (8384) is intentionally NOT listed — authentik-gate-sync generates the
@@ -157,8 +173,18 @@ spec:
     matchLabels:
       app.kubernetes.io/name: syncthing
   ingress:
+    - fromCIDRSet:
+        - cidrGroupRef: net-privat
+        - cidrGroupRef: net-vpn
+      toPorts:
+        - ports:
+            - port: "22000"
+              protocol: TCP
+            - port: "22000"
+              protocol: UDP
+            - port: "21027"
+              protocol: UDP
     - fromEntities:
-        - world
         - host
         - remote-node
       toPorts:

kubernetes/infrastructure/network-policies/trmnl-ns.yaml

@@ -62,9 +62,10 @@ spec:
 # CA, so this bypasses Traefik entirely and the namespace default-deny has
 # to be opened for it — same shape as paperless's allow-ftp-scanner.
 #
-# Scoped to the terminus pods and port 2345 only. Requests still have to
-# carry a known device MAC in the `ID` header plus its api_key; this rule
-# opens the port, not the application.
+# Scoped to the terminus pods, port 2345 and the IoT network (the panel's
+# network; the LB is ETP=Local, so the client address reaches the pod).
+# Requests still have to carry a known device MAC in the `ID` header plus
+# its api_key; this rule opens the port, not the application.
 apiVersion: cilium.io/v2
 kind: CiliumNetworkPolicy
 metadata:
@@ -75,8 +76,13 @@ spec:
     matchLabels:
       app.kubernetes.io/name: terminus
   ingress:
+    - fromCIDRSet:
+        - cidrGroupRef: net-iot
+      toPorts:
+        - ports:
+            - port: "2345"
+              protocol: TCP
     - fromEntities:
-        - world
         - host
         - remote-node
       toPorts:

opentofu/unifi_nat_hairpin.tf

@@ -68,13 +68,14 @@ locals {
   # idx is a static per-network slot for rule_index derivation — never
   # reuse a freed idx for a new network.
   #
-  # Deliberately absent: (40) Server idx=4, (42) Ingress idx=5, and
-  # (49) k8s Ceph idx=6. The cluster nodes have interfaces on those VLANs,
-  # so a DNATed flow's reply would go directly over the shared L2 and
-  # bypass the UDM's conntrack (asymmetric, connection drops) — and
-  # clients there are the nodes themselves, whose DNS chain (CoreDNS ->
-  # k8s_gateway) already resolves the public names in-cluster. Their idx
-  # slots stay reserved.
+  # Deliberately absent: (40) Server idx=4, (49) k8s Ceph idx=6,
+  # (46) k8s Node, (47) k8s Ingress and (48) k8s Pod. The cluster nodes
+  # have interfaces on those VLANs (mgmt0, node0, ingress0, pod0), so a
+  # DNATed flow's reply would go directly over the shared L2 and bypass
+  # the UDM's conntrack (asymmetric, connection drops) — and clients there
+  # are the nodes themselves, whose DNS chain (CoreDNS -> k8s_gateway)
+  # already resolves the public names in-cluster. idx=5 stays reserved
+  # (its network, (42) Ingress, no longer exists).
   hairpin_networks = {
     "Default"              = { id = "5d4fba77ce63ee614841d53d", idx = 0 }
     "(10) Management"      = { id = "600334abf9ee0c059da6be8f", idx = 1 }