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Simplify Disallow hostPorts in CEL expressions #1108

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Merged
JimBugwadia merged 2 commits into from
Oct 22, 2025
Merged

Simplify Disallow hostPorts in CEL expressions #1108

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5a11bc5
Update artifacthub-pkg.yml
lavishpal Oct 21, 2025
178b163
refactor: simplify disallow-host-ports CEL expressions using allConta…
realshuting May 21, 2025
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4 changes: 2 additions & 2 deletions pod-security-cel/baseline/disallow-host-ports/artifacthub-pkg.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -19,5 +19,5 @@ annotations:
kyverno/category: "Pod Security Standards (Baseline) in CEL"
kyverno/kubernetesVersion: "1.26-1.27"
kyverno/subject: "Pod"
digest: b95cfe16e11be0b9507736687bd99b5ea78c455f8fc35194220326ea5ff3913c
createdAt: "2023-12-03T00:22:34Z"
digest: 80013655376b57e3f079c5c748013f6b2f04c16eb32f8c8bd0c6208e4a4f71db
createdAt: "2025-10-22T00:05:34Z"
35 changes: 13 additions & 22 deletions pod-security-cel/baseline/disallow-host-ports/disallow-host-ports.yaml
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Expand Up @@ -12,7 +12,7 @@ metadata:
policies.kyverno.io/description: >-
Access to host ports allows potential snooping of network traffic and should not be
allowed, or at minimum restricted to a known list. This policy ensures the `hostPort`
field is unset or set to `0`.
field is unset or set to `0`.
spec:
validationFailureAction: Audit
background: true
Expand All @@ -28,26 +28,17 @@ spec:
- UPDATE
validate:
cel:
variables:
- name: allContainers
expression: >-
object.spec.containers +
object.spec.?initContainers.orValue([]) +
object.spec.?ephemeralContainers.orValue([])
expressions:
- expression: >-
object.spec.containers.all(container, !has(container.ports) ||
container.ports.all(port, !has(port.hostPort) || port.hostPort == 0))
- expression: >-
variables.allContainers.all(container,
container.?ports.orValue([]).all(port, port.?hostPort.orValue(0) == 0))
message: >-
Use of host ports is disallowed. The field spec.containers[*].ports[*].hostPort
must either be unset or set to `0`.

- expression: >-
!has(object.spec.initContainers) ||
object.spec.initContainers.all(container, !has(container.ports) ||
container.ports.all(port, !has(port.hostPort) || port.hostPort == 0))
message: >-
Use of host ports is disallowed. The field spec.initContainers[*].ports[*].hostPort
must either be unset or set to `0`.

- expression: >-
!has(object.spec.ephemeralContainers) ||
object.spec.ephemeralContainers.all(container, !has(container.ports) ||
container.ports.all(port, !has(port.hostPort) || port.hostPort == 0))
message: >-
Use of host ports is disallowed. The field spec.ephemeralContainers[*].ports[*].hostPort
must either be unset or set to `0`.
Use of host ports is disallowed. The fields spec.containers[*].ports[*].hostPort,
spec.initContainers[*].ports[*].hostPort, and spec.ephemeralContainers[*].ports[*].hostPort
must either be unset or set to `0`.
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