add infra

Signed-off-by: gwg313 <gwg313@pm.me>

infra-root.yaml

@@ -0,0 +1,20 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: infra-root
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/gwg313/homelab-gitops
+    targetRevision: main
+    path: infra
+    directory:
+      recurse: true
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: argocd
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true

infra/network-policies-app.yaml

@@ -0,0 +1,20 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: default-network-policies
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "-10"
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/gwg313/homelab-gitops
+    targetRevision: main
+    path: platform/default-network-policies
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: argocd
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true

platform/default-network-policies/core-k8s-services.yaml

@@ -0,0 +1,70 @@
+---
+apiVersion: "cilium.io/v2"
+kind: CiliumClusterwideNetworkPolicy
+metadata:
+  name: baseline-allow-coredns-egress
+spec:
+  description: "Allow all pods to send DNS queries out to CoreDNS"
+  endpointSelector:
+    matchLabels: {}
+  egress:
+    - toEndpoints:
+      - matchLabels:
+          k8s:io.kubernetes.pod.namespace: kube-system
+          k8s-app: kube-dns
+      toPorts:
+        - ports:
+            - port: "53"
+              protocol: UDP
+            - port: "53"
+              protocol: TCP
+---
+apiVersion: "cilium.io/v2"
+kind: CiliumClusterwideNetworkPolicy
+metadata:
+  name: baseline-allow-coredns-ingress
+spec:
+  description: "Allow CoreDNS to receive incoming DNS queries"
+  endpointSelector:
+    matchLabels:
+      k8s:io.kubernetes.pod.namespace: kube-system
+      k8s-app: kube-dns
+  ingress:
+    - fromEndpoints:
+      - matchLabels: {} # Accepts from any pod
+      toPorts:
+        - ports:
+            - port: "53"
+              protocol: UDP
+            - port: "53"
+              protocol: TCP
+---
+apiVersion: "cilium.io/v2"
+kind: CiliumClusterwideNetworkPolicy
+metadata:
+  name: baseline-allow-apiserver
+spec:
+  description: "Allow all pods to communicate with the K8s API"
+  endpointSelector:
+    matchLabels: {}
+  egress:
+    - toEntities:
+        - kube-apiserver
+---
+apiVersion: "cilium.io/v2"
+kind: CiliumClusterwideNetworkPolicy
+metadata:
+  name: baseline-allow-coredns-to-internet
+spec:
+  description: "Allow CoreDNS pods to reach upstream DNS servers on the internet"
+  endpointSelector:
+    matchLabels:
+      k8s:io.kubernetes.pod.namespace: kube-system
+      k8s-app: kube-dns
+  egress:
+    - toEntities:
+        - world
+      toPorts:
+        - ports:
+            - port: "53"
+              protocol: ANY

platform/default-network-policies/default-deny.yaml

@@ -0,0 +1,12 @@
+apiVersion: "cilium.io/v2"
+kind: CiliumClusterwideNetworkPolicy
+metadata:
+  name: baseline-default-deny
+spec:
+  description: "Deny all ingress and egress cluster-wide by default"
+  endpointSelector:
+    matchLabels: {}
+  ingress:
+    - {}
+  egress:
+    - {}

platform/default-network-policies/hubble.yaml

@@ -0,0 +1,77 @@
+apiVersion: "cilium.io/v2"
+kind: CiliumNetworkPolicy
+metadata:
+  name: allow-hubble-port-forward
+  namespace: kube-system
+spec:
+  description: "Allow host-level port-forwarding to Hubble Relay and UI"
+  endpointSelector:
+    matchLabels:
+      io.cilium.k8s.policy.serviceaccount: hubble-relay 
+  ingress:
+    - fromEntities:
+        - host
+        - remote-node
+      toPorts:
+        - ports:
+            - port: "4245"
+              protocol: TCP
+            - port: "8081"
+              protocol: TCP
+---
+apiVersion: "cilium.io/v2"
+kind: CiliumNetworkPolicy
+metadata:
+  name: allow-hubble-ui-to-relay
+  namespace: kube-system
+spec:
+  description: "Allow Hubble UI to fetch data from Hubble Relay"
+  endpointSelector:
+    matchLabels:
+      k8s-app: hubble-relay
+  ingress:
+    - fromEndpoints:
+      - matchLabels:
+          k8s-app: hubble-ui
+      toPorts:
+        - ports:
+            - port: "4245"
+              protocol: TCP
+---
+apiVersion: "cilium.io/v2"
+kind: CiliumNetworkPolicy
+metadata:
+  name: allow-hubble-relay-to-agents
+  namespace: kube-system
+spec:
+  description: "Allow Hubble Relay to collect flows from Cilium node agents"
+  endpointSelector:
+    matchLabels:
+      k8s-app: hubble-relay
+  egress:
+    - toEntities:
+        - host
+        - remote-node
+      toPorts:
+        - ports:
+            - port: "4244"
+              protocol: TCP
+---
+apiVersion: "cilium.io/v2"
+kind: CiliumNetworkPolicy
+metadata:
+  name: allow-hubble-ui-egress-to-relay
+  namespace: kube-system
+spec:
+  description: "Allow Hubble UI to send requests to Hubble Relay"
+  endpointSelector:
+    matchLabels:
+      k8s-app: hubble-ui
+  egress:
+    - toEndpoints:
+      - matchLabels:
+          k8s-app: hubble-relay
+      toPorts:
+        - ports:
+            - port: "4245"
+              protocol: TCP