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Separate feature-gate for AppArmor fields

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This commit is contained in:
Tim Allclair 2024-03-05 17:04:36 -08:00
parent 22068e0cc7
commit 2d86cbf261
6 changed files with 86 additions and 38 deletions
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20
pkg/api/pod/util.go
View File

@ -539,12 +539,14 @@ func dropDisabledFields(
podSpec = &api.PodSpec{}
}
if !utilfeature.DefaultFeatureGate.Enabled(features.AppArmor) && !appArmorInUse(oldPodAnnotations, oldPodSpec) {
if !utilfeature.DefaultFeatureGate.Enabled(features.AppArmor) && !appArmorAnnotationsInUse(oldPodAnnotations) {
for k := range podAnnotations {
if strings.HasPrefix(k, api.DeprecatedAppArmorAnnotationKeyPrefix) {
delete(podAnnotations, k)
}
}
}
if (!utilfeature.DefaultFeatureGate.Enabled(features.AppArmor) || !utilfeature.DefaultFeatureGate.Enabled(features.AppArmorFields)) && !appArmorFieldsInUse(oldPodSpec) {
if podSpec.SecurityContext != nil {
podSpec.SecurityContext.AppArmorProfile = nil
}
@ -947,17 +949,21 @@ func procMountInUse(podSpec *api.PodSpec) bool {
return inUse
}
// appArmorInUse returns true if the pod has apparmor related information
func appArmorInUse(podAnnotations map[string]string, podSpec *api.PodSpec) bool {
if podSpec == nil {
return false
}
// appArmorAnnotationsInUse returns true if the pod has apparmor annotations
func appArmorAnnotationsInUse(podAnnotations map[string]string) bool {
for k := range podAnnotations {
if strings.HasPrefix(k, api.DeprecatedAppArmorAnnotationKeyPrefix) {
return true
}
}
return false
}
// appArmorFieldsInUse returns true if the pod has apparmor fields set
func appArmorFieldsInUse(podSpec *api.PodSpec) bool {
if podSpec == nil {
return false
}
if podSpec.SecurityContext != nil && podSpec.SecurityContext.AppArmorProfile != nil {
return true
}

57
pkg/api/pod/util_test.go
View File

@ -708,18 +708,33 @@ func TestDropProcMount(t *testing.T) {
func TestDropAppArmor(t *testing.T) {
tests := []struct {
description string
hasAppArmor bool
hasAnnotations bool
hasFields bool
pod api.Pod
}{{
description: "with AppArmor Annotations",
hasAppArmor: true,
hasAnnotations: true,
pod: api.Pod{
ObjectMeta: metav1.ObjectMeta{Annotations: map[string]string{"a": "1", v1.DeprecatedAppArmorBetaContainerAnnotationKeyPrefix + "foo": "default"}},
Spec: api.PodSpec{},
},
}, {
description: "with AppArmor Annotations & fields",
hasAnnotations: true,
hasFields: true,
pod: api.Pod{
ObjectMeta: metav1.ObjectMeta{Annotations: map[string]string{"a": "1", v1.DeprecatedAppArmorBetaContainerAnnotationKeyPrefix + "foo": "default"}},
Spec: api.PodSpec{
SecurityContext: &api.PodSecurityContext{
AppArmorProfile: &api.AppArmorProfile{
Type: api.AppArmorProfileTypeRuntimeDefault,
},
},
},
},
}, {
description: "with pod AppArmor profile",
hasAppArmor: true,
hasFields: true,
pod: api.Pod{
ObjectMeta: metav1.ObjectMeta{Annotations: map[string]string{"a": "1"}},
Spec: api.PodSpec{
@ -732,7 +747,7 @@ func TestDropAppArmor(t *testing.T) {
},
}, {
description: "with container AppArmor profile",
hasAppArmor: true,
hasFields: true,
pod: api.Pod{
ObjectMeta: metav1.ObjectMeta{Annotations: map[string]string{"a": "1"}},
Spec: api.PodSpec{
@ -747,7 +762,6 @@ func TestDropAppArmor(t *testing.T) {
},
}, {
description: "without AppArmor",
hasAppArmor: false,
pod: api.Pod{
ObjectMeta: metav1.ObjectMeta{Annotations: map[string]string{"a": "1"}},
Spec: api.PodSpec{},
@ -756,13 +770,18 @@ func TestDropAppArmor(t *testing.T) {
for _, test := range tests {
for _, enabled := range []bool{true, false} {
t.Run(fmt.Sprintf("%v/enabled=%v", test.description, enabled), func(t *testing.T) {
for _, fieldsEnabled := range []bool{true, false} {
t.Run(fmt.Sprintf("%v/enabled=%v/fields=%v", test.description, enabled, fieldsEnabled), func(t *testing.T) {
defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AppArmor, enabled)()
defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AppArmorFields, fieldsEnabled)()
newPod := test.pod.DeepCopy()
if actual := appArmorInUse(newPod.Annotations, &newPod.Spec); actual != test.hasAppArmor {
t.Errorf("appArmorInUse does not match expectation: %t != %t", actual, test.hasAppArmor)
if hasAnnotations := appArmorAnnotationsInUse(newPod.Annotations); hasAnnotations != test.hasAnnotations {
t.Errorf("appArmorAnnotationsInUse does not match expectation: %t != %t", hasAnnotations, test.hasAnnotations)
}
if hasFields := appArmorFieldsInUse(&newPod.Spec); hasFields != test.hasFields {
t.Errorf("appArmorFieldsInUse does not match expectation: %t != %t", hasFields, test.hasFields)
}
DropDisabledPodFields(newPod, newPod)
@ -770,22 +789,26 @@ func TestDropAppArmor(t *testing.T) {
DropDisabledPodFields(newPod, nil)
if enabled {
assert.Equal(t, &test.pod, newPod, "pod should not be mutated when AppArmor is enabled")
} else {
if appArmorInUse(newPod.Annotations, &newPod.Spec) {
t.Errorf("newPod should not be using appArmor after dropping disabled fields")
if enabled && fieldsEnabled {
assert.Equal(t, &test.pod, newPod, "pod should not be mutated when both feature gates are enabled")
return
}
if test.hasAppArmor {
assert.NotEqual(t, &test.pod, newPod, "pod should be mutated to drop AppArmor")
} else {
assert.Equal(t, &test.pod, newPod, "pod without AppArmor should not be mutated")
expectAnnotations := test.hasAnnotations && enabled
assert.Equal(t, expectAnnotations, appArmorAnnotationsInUse(newPod.Annotations), "AppArmor annotations expectation")
if expectAnnotations == test.hasAnnotations {
assert.Equal(t, test.pod.Annotations, newPod.Annotations, "annotations should not be mutated")
}
expectFields := test.hasFields && enabled && fieldsEnabled
assert.Equal(t, expectFields, appArmorFieldsInUse(&newPod.Spec), "AppArmor fields expectation")
if expectFields == test.hasFields {
assert.Equal(t, &test.pod.Spec, &newPod.Spec, "PodSpec should not be mutated")
}
})
}
}
}
}
func TestDropDynamicResourceAllocation(t *testing.T) {

3
pkg/apis/core/validation/validation.go
View File

@ -4736,6 +4736,9 @@ func ValidateAppArmorProfileFormat(profile string) error {
// validateAppArmorAnnotationsAndFieldsMatchOnCreate validates that AppArmor fields and annotations are consistent.
func validateAppArmorAnnotationsAndFieldsMatchOnCreate(objectMeta metav1.ObjectMeta, podSpec *core.PodSpec, specPath *field.Path) field.ErrorList {
if !utilfeature.DefaultFeatureGate.Enabled(features.AppArmorFields) {
return nil
}
if podSpec.OS != nil && podSpec.OS.Name == core.Windows {
// Skip consistency check for windows pods.
return nil

6
pkg/features/kube_features.go
View File

@ -63,6 +63,10 @@ const (
// beta: v1.4
AppArmor featuregate.Feature = "AppArmor"
// owner: @tallclair
// beta: v1.30
AppArmorFields featuregate.Feature = "AppArmorFields"
// owner: @danwinship
// alpha: v1.27
// beta: v1.29
@ -975,6 +979,8 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
AppArmor: {Default: true, PreRelease: featuregate.Beta},
AppArmorFields: {Default: true, PreRelease: featuregate.Beta},
CloudDualStackNodeIPs: {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.32
ClusterTrustBundle: {Default: false, PreRelease: featuregate.Alpha},

4
pkg/registry/core/pod/strategy.go
View File

@ -764,6 +764,10 @@ func applySchedulingGatedCondition(pod *api.Pod) {
// applyAppArmorVersionSkew implements the version skew behavior described in:
// https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/24-apparmor#version-skew-strategy
func applyAppArmorVersionSkew(pod *api.Pod) {
if !utilfeature.DefaultFeatureGate.Enabled(features.AppArmorFields) {
return
}
if pod.Spec.OS != nil && pod.Spec.OS.Name == api.Windows {
return
}

6
pkg/security/apparmor/helpers.go
View File

@ -20,7 +20,9 @@ import (
"strings"
v1 "k8s.io/api/core/v1"
utilfeature "k8s.io/apiserver/pkg/util/feature"
podutil "k8s.io/kubernetes/pkg/api/v1/pod"
"k8s.io/kubernetes/pkg/features"
)
// Checks whether app armor is required for the pod to run. AppArmor is considered required if any
@ -52,6 +54,10 @@ func isRequired(pod *v1.Pod) bool {
// GetProfileName returns the name of the profile to use with the container.
func GetProfile(pod *v1.Pod, container *v1.Container) *v1.AppArmorProfile {
if !utilfeature.DefaultFeatureGate.Enabled(features.AppArmorFields) {
return getProfileFromPodAnnotations(pod.Annotations, container.Name)
}
if container.SecurityContext != nil && container.SecurityContext.AppArmorProfile != nil {
return container.SecurityContext.AppArmorProfile
}