# Envoy Gateway: the controller and the proxy it runs (envoyproxy.yaml).
# Both reach each other (the proxy gets its config from the controller on
# 18000) and DNS, and take connections from each other and the node: the
# API server calls the controller's topology webhook (9443) from there and
# the kubelet probes come from there too (10.1.7.64 is the node's Calico
# VXLAN address, projectcalico.org/IPv4VXLANTunnelAddr). Nothing scrapes
# the metrics on 19001.
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default
  namespace: envoy-gateway-system
spec:
  podSelector: {}
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
        - podSelector: {}
    - from:
        - ipBlock:
            cidr: 192.168.1.204/32
        - ipBlock:
            cidr: 10.1.7.64/32
  egress:
    - to:
        - podSelector: {}
    - to:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: kube-system
          podSelector:
            matchLabels:
              k8s-app: kube-dns
      ports:
        - protocol: UDP
          port: 53
        - protocol: TCP
          port: 53
---
# The proxy holds the node's ports 80 and 443 (10080 and 10443 inside) and
# takes connections there from anywhere: the internet through node001 and
# the router, the LAN, and pods that call a public hostname. It reaches
# every app it routes to (pods in any namespace; their own policies decide
# which port), Home Assistant on 192.168.1.202:8123 (outside the cluster,
# home-assistant/), and the internet on 443 for Longhorn's OIDC login
# (authentik's token endpoint, at its public address).
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: proxy
  namespace: envoy-gateway-system
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: envoy
      app.kubernetes.io/component: proxy
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - ports:
        - port: 10080
        - port: 10443
  egress:
    - to:
        - namespaceSelector: {}
    - to:
        - ipBlock:
            cidr: 192.168.1.202/32
      ports:
        - port: 8123
    - to:
        - ipBlock:
            cidr: 0.0.0.0/0
            except:
              - 10.0.0.0/8
              - 100.64.0.0/10
              - 169.254.0.0/16
              - 172.16.0.0/12
              - 192.168.0.0/16
      ports:
        - port: 443
---
# Everything but the proxy (the controller, and the chart's certgen job on
# upgrades) reaches the API server (the node, port 16443). The controller
# also fetches the OIDC discovery document of Longhorn's SecurityPolicy
# from authentik's public address.
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: control-plane
  namespace: envoy-gateway-system
spec:
  podSelector:
    matchExpressions:
      - key: app.kubernetes.io/name
        operator: NotIn
        values:
          - envoy
  policyTypes:
    - Egress
  egress:
    - to:
        - ipBlock:
            cidr: 192.168.1.204/32
      ports:
        - port: 16443
    - to:
        - ipBlock:
            cidr: 0.0.0.0/0
            except:
              - 10.0.0.0/8
              - 100.64.0.0/10
              - 169.254.0.0/16
              - 172.16.0.0/12
              - 192.168.0.0/16
      ports:
        - port: 443