Add VAP-CEL to K8sPSPFlexVolumes #536
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| version: 1.1.0 | ||
| name: k8spspflexvolumes | ||
| displayName: FlexVolumes | ||
| createdAt: "2024-05-29T23:34:09Z" | ||
| description: Controls the allowlist of FlexVolume drivers. Corresponds to the `allowedFlexVolumes` field in PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#flexvolume-drivers | ||
| digest: d76c22a6c2f63b7421fe7b14da4668dbc27d93a0337884ddad79492802ce4e0f | ||
| license: Apache-2.0 | ||
| homeURL: https://open-policy-agent.github.io/gatekeeper-library/website/flexvolume-drivers | ||
| keywords: | ||
| - gatekeeper | ||
| - open-policy-agent | ||
| - policies | ||
| readme: |- | ||
| # FlexVolumes | ||
| Controls the allowlist of FlexVolume drivers. Corresponds to the `allowedFlexVolumes` field in PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#flexvolume-drivers | ||
| install: |- | ||
| ### Usage | ||
| ```shell | ||
| kubectl apply -f https://raw.githubusercontent.com/open-policy-agent/gatekeeper-library/master/artifacthub/library/pod-security-policy/flexvolume-drivers/1.1.0/template.yaml | ||
| ``` | ||
| provider: | ||
| name: Gatekeeper Library |
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| resources: | ||
| - template.yaml |
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| apiVersion: constraints.gatekeeper.sh/v1beta1 | ||
| kind: K8sPSPFlexVolumes | ||
| metadata: | ||
| name: psp-flexvolume-drivers | ||
| spec: | ||
| match: | ||
| kinds: | ||
| - apiGroups: [""] | ||
| kinds: ["Pod"] | ||
| parameters: | ||
| allowedFlexVolumes: #[] | ||
| - driver: "example/lvm" | ||
| - driver: "example/cifs" |
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| apiVersion: v1 | ||
| kind: Pod | ||
| metadata: | ||
| name: nginx-flexvolume-driver-allowed | ||
| labels: | ||
| app: nginx-flexvolume-driver | ||
| spec: | ||
| containers: | ||
| - name: nginx | ||
| image: nginx | ||
| volumeMounts: | ||
| - mountPath: /test | ||
| name: test-volume | ||
| readOnly: true | ||
| volumes: | ||
| - name: test-volume | ||
| flexVolume: | ||
| driver: "example/lvm" |
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| apiVersion: v1 | ||
| kind: Pod | ||
| metadata: | ||
| name: nginx-flexvolume-driver-disallowed | ||
| labels: | ||
| app: nginx-flexvolume-driver | ||
| spec: | ||
| containers: | ||
| - name: nginx | ||
| image: nginx | ||
| volumeMounts: | ||
| - mountPath: /test | ||
| name: test-volume | ||
| readOnly: true | ||
| volumes: | ||
| - name: test-volume | ||
| flexVolume: | ||
| driver: "example/testdriver" #"example/lvm" |
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| kind: AdmissionReview | ||
| apiVersion: admission.k8s.io/v1beta1 | ||
| request: | ||
| operation: "UPDATE" | ||
| object: | ||
| apiVersion: v1 | ||
| kind: Pod | ||
| metadata: | ||
| name: nginx-flexvolume-driver-disallowed | ||
| labels: | ||
| app: nginx-flexvolume-driver | ||
| spec: | ||
| containers: | ||
| - name: nginx | ||
| image: nginx | ||
| volumeMounts: | ||
| - mountPath: /test | ||
| name: test-volume | ||
| readOnly: true | ||
| volumes: | ||
| - name: test-volume | ||
| flexVolume: | ||
| driver: "example/testdriver" #"example/lvm" |
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| kind: Suite | ||
| apiVersion: test.gatekeeper.sh/v1alpha1 | ||
| metadata: | ||
| name: flexvolume-drivers | ||
| tests: | ||
| - name: flexvolume-drivers | ||
| template: template.yaml | ||
| constraint: samples/psp-flexvolume-drivers/constraint.yaml | ||
| cases: | ||
| - name: example-allowed | ||
| object: samples/psp-flexvolume-drivers/example_allowed.yaml | ||
| assertions: | ||
| - violations: no | ||
| - name: example-disallowed | ||
| object: samples/psp-flexvolume-drivers/example_disallowed.yaml | ||
| assertions: | ||
| - violations: yes | ||
| - name: update | ||
| object: samples/psp-flexvolume-drivers/update.yaml | ||
| assertions: | ||
| - violations: no |
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| apiVersion: templates.gatekeeper.sh/v1 | ||
| kind: ConstraintTemplate | ||
| metadata: | ||
| name: k8spspflexvolumes | ||
| annotations: | ||
| metadata.gatekeeper.sh/title: "FlexVolumes" | ||
| metadata.gatekeeper.sh/version: 1.1.0 | ||
| description: >- | ||
| Controls the allowlist of FlexVolume drivers. Corresponds to the | ||
| `allowedFlexVolumes` field in PodSecurityPolicy. For more information, | ||
| see | ||
| https://kubernetes.io/docs/concepts/policy/pod-security-policy/#flexvolume-drivers | ||
| spec: | ||
| crd: | ||
| spec: | ||
| names: | ||
| kind: K8sPSPFlexVolumes | ||
| validation: | ||
| # Schema for the `parameters` field | ||
| openAPIV3Schema: | ||
| type: object | ||
| description: >- | ||
| Controls the allowlist of FlexVolume drivers. Corresponds to the | ||
| `allowedFlexVolumes` field in PodSecurityPolicy. For more information, | ||
| see | ||
| https://kubernetes.io/docs/concepts/policy/pod-security-policy/#flexvolume-drivers | ||
| properties: | ||
| allowedFlexVolumes: | ||
| type: array | ||
| description: "An array of AllowedFlexVolume objects." | ||
| items: | ||
| type: object | ||
| properties: | ||
| driver: | ||
| description: "The name of the FlexVolume driver." | ||
| type: string | ||
| targets: | ||
| - target: admission.k8s.gatekeeper.sh | ||
| code: | ||
| - engine: K8sNativeValidation | ||
| source: | ||
| variables: | ||
| - name: flexVolumes | ||
| expression: | | ||
| !has(variables.anyObject.spec.volumes) ? [] : | ||
| variables.anyObject.spec.volumes.filter(volume, has(volume.flexVolume)) | ||
| - name: allowedFlexVolumeDrivers | ||
| expression: variables.params.allowedFlexVolumes.map(volume, volume.driver) | ||
| - name: badFlexVolumeNames | ||
| expression: | | ||
| variables.flexVolumes.map(volume, | ||
| !has(volume.flexVolume.driver) || !(volume.flexVolume.driver in variables.allowedFlexVolumeDrivers), | ||
| volume.name | ||
| ) | ||
| validations: | ||
| - expression: '(has(request.operation) && request.operation == "UPDATE") || size(variables.badFlexVolumeNames) == 0' | ||
| messageExpression: | | ||
| "FlexVolumes [" + variables.badFlexVolumeNames.join(", ") + "] not allowed, pod: " + variables.anyObject.metadata.name + ". Allowed drivers: [" + variables.allowedFlexVolumeDrivers.join(", ") + "]" | ||
| - engine: Rego | ||
| source: | ||
| rego: | | ||
| package k8spspflexvolumes | ||
|
|
||
| import data.lib.exclude_update.is_update | ||
|
|
||
| violation[{"msg": msg, "details": {}}] { | ||
| # spec.volumes field is immutable. | ||
| not is_update(input.review) | ||
|
|
||
| volume := input_flexvolumes[_] | ||
| not input_flexvolumes_allowed(volume) | ||
| msg := sprintf("FlexVolume %v is not allowed, pod: %v. Allowed drivers: %v", [volume, input.review.object.metadata.name, input.parameters.allowedFlexVolumes]) | ||
| } | ||
|
|
||
| input_flexvolumes_allowed(volume) { | ||
| input.parameters.allowedFlexVolumes[_].driver == volume.flexVolume.driver | ||
| } | ||
|
|
||
| input_flexvolumes[v] { | ||
| v := input.review.object.spec.volumes[_] | ||
| has_field(v, "flexVolume") | ||
| } | ||
|
|
||
| # has_field returns whether an object has a field | ||
| has_field(object, field) = true { | ||
| object[field] | ||
| } | ||
| libs: | ||
| - | | ||
| package lib.exclude_update | ||
|
|
||
| is_update(review) { | ||
| review.operation == "UPDATE" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -4,7 +4,7 @@ metadata: | |
| name: k8spspflexvolumes | ||
| annotations: | ||
| metadata.gatekeeper.sh/title: "FlexVolumes" | ||
| metadata.gatekeeper.sh/version: 1.1.0 | ||
| description: >- | ||
| Controls the allowlist of FlexVolume drivers. Corresponds to the | ||
| `allowedFlexVolumes` field in PodSecurityPolicy. For more information, | ||
|
|
@@ -36,8 +36,14 @@ spec: | |
| type: string | ||
| targets: | ||
| - target: admission.k8s.gatekeeper.sh | ||
| code: | ||
| - engine: K8sNativeValidation | ||
| source: | ||
| {{ file.Read "src/pod-security-policy/flexvolume-drivers/src.cel" | strings.Indent 10 | strings.TrimSuffix "\n" }} | ||
| - engine: Rego | ||
| source: | ||
| rego: | | ||
| {{ file.Read "src/pod-security-policy/flexvolume-drivers/src.rego" | strings.Indent 12 | strings.TrimSuffix "\n" }} | ||
| libs: | ||
| - | | ||
| {{ file.Read "src/pod-security-policy/flexvolume-drivers/lib_exclude_update.rego" | strings.Indent 12 | strings.TrimSuffix "\n" }} | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| variables: | ||
| - name: flexVolumes | ||
| expression: | | ||
| !has(variables.anyObject.spec.volumes) ? [] : | ||
| variables.anyObject.spec.volumes.filter(volume, has(volume.flexVolume)) | ||
| - name: allowedFlexVolumeDrivers | ||
| expression: variables.params.allowedFlexVolumes.map(volume, volume.driver) | ||
| - name: badFlexVolumeNames | ||
| expression: | | ||
| variables.flexVolumes.map(volume, | ||
| !has(volume.flexVolume.driver) || !(volume.flexVolume.driver in variables.allowedFlexVolumeDrivers), | ||
| volume.name | ||
| ) | ||
| validations: | ||
| - expression: '(has(request.operation) && request.operation == "UPDATE") || size(variables.badFlexVolumeNames) == 0' | ||
| messageExpression: | | ||
| "FlexVolumes [" + variables.badFlexVolumeNames.join(", ") + "] not allowed, pod: " + variables.anyObject.metadata.name + ". Allowed drivers: [" + variables.allowedFlexVolumeDrivers.join(", ") + "]" |
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to avoid null pointers