home-network-k3s-impl/conformance/tests/l2-behavioral/deny-undeclared/chainsaw-test.yaml

# =============================================================================
# L2 BEHAVIORAL — Explicit allow / deny-undeclared  (R-NET-02)   [RUNNABLE]
# Catalog: docs/14 "Explicit allow / deny-undeclared (R-NET-02)"
# Spec:    docs/03-networking-isolation-and-egress.md "Explicit allow rules"
#
# GIVEN a namespace with default-deny + ONE explicit allow (source -> declared-dest:8080),
# WHEN  the source reaches the DECLARED dest port      -> THEN it succeeds;
# WHEN  the source reaches an UNDECLARED port (9090)   -> THEN it fails;
# WHEN  the source reaches an UNDECLARED dest (other)  -> THEN it fails.
#
# The destinations LISTEN on every probed port, so a block is caused by POLICY,
# not by a missing listener — this asserts BEHAVIOR, not object existence (R-TEST-01).
#
# RUNNABLE ON THE BASE CLUSTER: the fixture supplies the default-deny baseline and
# the single allow (fixtures/source-and-dests.yaml); Cilium enforces the standard
# NetworkPolicies. Probes are ephemeral Jobs labeled app=source so the allow/deny
# rules apply to them; chainsaw namespace teardown cleans everything.
# =============================================================================
apiVersion: chainsaw.kyverno.io/v1alpha1
kind: Test
metadata:
  name: deny-undeclared
  labels:
    conformance.home.k3s/R-NET-02: "true"
  annotations:
    conformance.home.k3s/requirements: "R-NET-02"
    conformance.home.k3s/layer: "L2"
    conformance.home.k3s/safety-critical: "false"
    conformance.home.k3s/executable: "true"
    conformance.home.k3s/intent: >-
      A declared dependency (source->declared-dest:8080) connects; an undeclared
      port and an undeclared destination are both blocked by policy.
spec:
  steps:
    # -- GIVEN: baseline + one explicit allow + two live destinations. Wait until
    #    both destinations are Ready so a later block is unambiguously policy-caused.
    - name: given-source-with-declared-dependency
      try:
        - apply:
            file: fixtures/source-and-dests.yaml
        - assert:
            resource:
              apiVersion: v1
              kind: Pod
              metadata: { name: declared-dest }
              status:
                conditions:
                  - type: Ready
                    status: "True"
        - assert:
            resource:
              apiVersion: v1
              kind: Pod
              metadata: { name: other-dest }
              status:
                conditions:
                  - type: Ready
                    status: "True"

    # -- THEN(declared succeeds): source -> declared-dest:8080 connects. Green Job = allowed.
    - name: then-declared-succeeds
      try:
        - apply:
            resource:
              apiVersion: batch/v1
              kind: Job
              metadata:
                name: probe-allowed
              spec:
                backoffLimit: 4
                activeDeadlineSeconds: 120
                template:
                  metadata:
                    labels: { app: source }
                  spec:
                    restartPolicy: Never
                    containers:
                      - name: probe
                        image: busybox:1.36.1
                        command:
                          - sh
                          - -c
                          - |
                            set -eu
                            nc -w 5 declared-dest 8080 </dev/null
                            echo ALLOW_OK
        - assert:
            resource:
              apiVersion: batch/v1
              kind: Job
              metadata: { name: probe-allowed }
              status: { succeeded: 1 }

    # -- THEN(undeclared PORT denied): source -> declared-dest:9090 is blocked.
    #    The Job EXITS 0 only when the connection is BLOCKED (green Job = deny).
    - name: then-undeclared-port-denied
      try:
        - apply:
            resource:
              apiVersion: batch/v1
              kind: Job
              metadata:
                name: probe-undeclared-port
              spec:
                backoffLimit: 4
                activeDeadlineSeconds: 120
                template:
                  metadata:
                    labels: { app: source }
                  spec:
                    restartPolicy: Never
                    containers:
                      - name: probe
                        image: busybox:1.36.1
                        command:
                          - sh
                          - -c
                          - |
                            set -u
                            if nc -w 5 declared-dest 9090 </dev/null 2>/dev/null; then
                              echo "LEAK: undeclared port 9090 reachable" 1>&2
                              exit 1
                            fi
                            echo DENY_PORT_OK
        - assert:
            resource:
              apiVersion: batch/v1
              kind: Job
              metadata: { name: probe-undeclared-port }
              status: { succeeded: 1 }

    # -- THEN(undeclared DEST denied): source -> other-dest:8080 is blocked.
    - name: then-undeclared-dest-denied
      try:
        - apply:
            resource:
              apiVersion: batch/v1
              kind: Job
              metadata:
                name: probe-undeclared-dest
              spec:
                backoffLimit: 4
                activeDeadlineSeconds: 120
                template:
                  metadata:
                    labels: { app: source }
                  spec:
                    restartPolicy: Never
                    containers:
                      - name: probe
                        image: busybox:1.36.1
                        command:
                          - sh
                          - -c
                          - |
                            set -u
                            if nc -w 5 other-dest 8080 </dev/null 2>/dev/null; then
                              echo "LEAK: undeclared destination reachable" 1>&2
                              exit 1
                            fi
                            echo DENY_DEST_OK
        - assert:
            resource:
              apiVersion: batch/v1
              kind: Job
              metadata: { name: probe-undeclared-dest }
              status: { succeeded: 1 }
      finally:
        - script:
            content: 'echo "cleanup handled by chainsaw namespace teardown"'