From ce5094c1c8dce51111acc11317d2e76a1a5a8bc2 Mon Sep 17 00:00:00 2001
From: snothub <danijels@gmail.com>
Date: Fri, 27 Mar 2026 11:49:03 +0100
Subject: [PATCH] egress

---
 .../network/deny-external-egress-trivy.yaml   | 37 +++++++++++++++++++
 infra/cluster-resources-application.yaml      |  2 +
 infra/network-policies-application.yaml       | 33 +++++++++++++++++
 3 files changed, 72 insertions(+)
 create mode 100644 cluster-resources/network/deny-external-egress-trivy.yaml
 create mode 100644 infra/network-policies-application.yaml

diff --git a/cluster-resources/network/deny-external-egress-trivy.yaml b/cluster-resources/network/deny-external-egress-trivy.yaml
new file mode 100644
index 0000000..939aa11
--- /dev/null
+++ b/cluster-resources/network/deny-external-egress-trivy.yaml
@@ -0,0 +1,37 @@
+apiVersion: cilium.io/v2
+kind: CiliumNetworkPolicy
+metadata:
+  name: deny-external-egress
+  namespace: trivy-system
+  labels:
+    app.kubernetes.io/managed-by: argocd
+    app.kubernetes.io/part-of: network-policies
+spec:
+  endpointSelector: {}
+  egress:
+    # Allow DNS resolution
+    - toEndpoints:
+        - matchLabels:
+            io.kubernetes.pod.namespace: kube-system
+            k8s-app: kube-dns
+      toPorts:
+        - ports:
+            - port: "53"
+              protocol: UDP
+            - port: "53"
+              protocol: TCP
+
+    # Allow cluster-internal traffic (RFC1918)
+    - toCIDR:
+        - 10.0.0.0/8
+        - 172.16.0.0/12
+        - 192.168.0.0/16
+
+    # Allow Trivy vulnerability DB downloads (ghcr.io OCI registry)
+    - toFQDNs:
+        - matchName: ghcr.io
+        - matchName: pkg-containers.githubusercontent.com
+      toPorts:
+        - ports:
+            - port: "443"
+              protocol: TCP
diff --git a/infra/cluster-resources-application.yaml b/infra/cluster-resources-application.yaml
index 4072f08..72886b4 100644
--- a/infra/cluster-resources-application.yaml
+++ b/infra/cluster-resources-application.yaml
@@ -18,6 +18,8 @@ spec:
     repoURL: git@github.com:fortedigital/sturdy-adventure.git
     targetRevision: HEAD
     path: cluster-resources
+    directory:
+      exclude: 'network'
 
   destination:
     server: https://kubernetes.default.svc
diff --git a/infra/network-policies-application.yaml b/infra/network-policies-application.yaml
new file mode 100644
index 0000000..08ec050
--- /dev/null
+++ b/infra/network-policies-application.yaml
@@ -0,0 +1,33 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: network-policies
+  namespace: argocd
+  labels:
+    app.kubernetes.io/name: network-policies
+    app.kubernetes.io/part-of: platform
+    app.kubernetes.io/managed-by: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "1"
+  finalizers:
+  - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+
+  source:
+    repoURL: git@github.com:fortedigital/sturdy-adventure.git
+    targetRevision: HEAD
+    path: cluster-resources/network
+
+  destination:
+    server: https://kubernetes.default.svc
+
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+      allowEmpty: false
+
+    syncOptions:
+    - Validate=true
+    - ServerSideApply=true