audit-core/deploy/networkpolicies.yaml

# Default-deny plus the narrowest set of exceptions (AUDIT-WP-0005-T03).
#
# The receiver holds the audit trail, so reachability is part of its threat
# model: only the declared sender may write, and only the declared operator
# path may read.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: audit-core-default-deny
  namespace: audit-core
spec:
  podSelector: {}
  policyTypes: [Ingress, Egress]
  # No rules: everything not permitted below is denied.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: audit-core-sender-ingress
  namespace: audit-core
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: audit-core
  policyTypes: [Ingress]
  ingress:
    # user-engine is the only sender. A second sender is a deliberate change
    # here and a matching entry in AUDIT_CORE_SENDERS — the network rule and
    # the credential binding must move together.
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: user-engine
      ports:
        - {protocol: TCP, port: 8080}
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: audit-core-whitehat-ingress
  namespace: audit-core
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: audit-core
  policyTypes: [Ingress]
  ingress:
    # Governed E2 evidence plane. Both selectors belong to one peer and are
    # therefore ANDed: only the registered audit-core probe in the dedicated
    # whitehat namespace reaches this port. Application sender authentication
    # and tenant scope remain the inner boundary.
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: whitehat
          podSelector:
            matchLabels:
              whitehat.security/plane: "true"
              whitehat.security/target: audit-core
      ports:
        - {protocol: TCP, port: 8080}
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: audit-core-approval-engine-ingress
  namespace: audit-core
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: audit-core
  policyTypes: [Ingress]
  ingress:
    # AUDIT-WP-0009-T09 / AUDIT-IN-0001. Load-bearing approval evidence
    # (§9.4). Both selectors belong to one peer and are therefore ANDed:
    # only the approval-engine workload in its own namespace reaches this
    # port. Splitting them into two list items would turn AND into OR and
    # admit every pod in either set.
    #
    # Narrower than user-engine's namespace-only rule on purpose: this is a
    # new sender, and a new rule should not inherit an older rule's breadth.
    # user-engine's policy is deliberately left unchanged.
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: approval-engine
          podSelector:
            matchLabels:
              app.kubernetes.io/name: approval-engine
      ports:
        - {protocol: TCP, port: 8080}
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: audit-core-operator-ingress
  namespace: audit-core
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: audit-core
  policyTypes: [Ingress]
  ingress:
    # Operator read path: lookup, dead letters, secret findings, stats.
    # Namespace-scoped rather than open, and still gated on a credential
    # carrying may_read — the network rule is the outer of two checks, not the
    # only one.
    - from:
        - namespaceSelector:
            matchLabels:
              railiance.io/audit-core-reader: "true"
      ports:
        - {protocol: TCP, port: 8080}
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: audit-core-egress
  namespace: audit-core
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: audit-core
  policyTypes: [Egress]
  egress:
    # PostgreSQL custody store. This is the only destination the receiver needs;
    # it calls no other service.
    - to:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: databases
      ports:
        - {protocol: TCP, port: 5432}
    - to:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: kube-system
      ports:
        - {protocol: UDP, port: 53}
        - {protocol: TCP, port: 53}