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do not allow the node to update it's owner reference

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This commit is contained in:
Sergey Kanzhelev 2025-05-22 17:54:10 +00:00 committed by Nathan Herz
parent 0f034701c1
commit 21b02fabc2
2 changed files with 35 additions and 6 deletions
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5
plugin/pkg/admission/noderestriction/admission.go
View file

@ -518,6 +518,11 @@ func (p *Plugin) admitNode(nodeName string, a admission.Attributes) error {
return admission.NewForbidden(a, fmt.Errorf("node %q is not allowed to modify taints", nodeName))
}
// Don't allow a node to update its own ownerReferences.
if !apiequality.Semantic.DeepEqual(node.OwnerReferences, oldNode.OwnerReferences) {
return admission.NewForbidden(a, fmt.Errorf("node %q is not allowed to modify ownerReferences", nodeName))
}
// Don't allow a node to update labels outside the allowed set.
// This would allow a node to add or modify its labels in a way that would let it steer privileged workloads to itself.
modifiedLabels := getModifiedLabels(node.Labels, oldNode.Labels)

36
plugin/pkg/admission/noderestriction/admission_test.go
View file

@ -254,10 +254,14 @@ func (a *admitTestCase) run(t *testing.T) {
func Test_nodePlugin_Admit(t *testing.T) {
var (
mynode = &user.DefaultInfo{Name: "system:node:mynode", Groups: []string{"system:nodes"}}
bob = &user.DefaultInfo{Name: "bob"}
trueRef = true
mynode = &user.DefaultInfo{Name: "system:node:mynode", Groups: []string{"system:nodes"}}
bob = &user.DefaultInfo{Name: "bob"}
mynodeObjMeta = metav1.ObjectMeta{Name: "mynode", UID: "mynode-uid"}
mynodeObjMetaOwnerRefA = metav1.ObjectMeta{Name: "mynode", UID: "mynode-uid", OwnerReferences: []metav1.OwnerReference{{Name: "fooerA", Controller: &trueRef}}}
mynodeObjMetaOwnerRefB = metav1.ObjectMeta{Name: "mynode", UID: "mynode-uid", OwnerReferences: []metav1.OwnerReference{{Name: "fooerB", Controller: &trueRef}}}
mynodeObjMeta = metav1.ObjectMeta{Name: "mynode", UID: "mynode-uid"}
mynodeObj = &api.Node{ObjectMeta: mynodeObjMeta}
mynodeObjConfigA = &api.Node{ObjectMeta: mynodeObjMeta, Spec: api.NodeSpec{ConfigSource: &api.NodeConfigSource{
ConfigMap: &api.ConfigMapNodeConfigSource{
@ -274,9 +278,11 @@ func Test_nodePlugin_Admit(t *testing.T) {
KubeletConfigKey: "kubelet",
}}}}
mynodeObjTaintA = &api.Node{ObjectMeta: mynodeObjMeta, Spec: api.NodeSpec{Taints: []api.Taint{{Key: "mykey", Value: "A"}}}}
mynodeObjTaintB = &api.Node{ObjectMeta: mynodeObjMeta, Spec: api.NodeSpec{Taints: []api.Taint{{Key: "mykey", Value: "B"}}}}
othernodeObj = &api.Node{ObjectMeta: metav1.ObjectMeta{Name: "othernode"}}
mynodeObjTaintA = &api.Node{ObjectMeta: mynodeObjMeta, Spec: api.NodeSpec{Taints: []api.Taint{{Key: "mykey", Value: "A"}}}}
mynodeObjTaintB = &api.Node{ObjectMeta: mynodeObjMeta, Spec: api.NodeSpec{Taints: []api.Taint{{Key: "mykey", Value: "B"}}}}
mynodeObjOwnerRefA = &api.Node{ObjectMeta: mynodeObjMetaOwnerRefA}
mynodeObjOwnerRefB = &api.Node{ObjectMeta: mynodeObjMetaOwnerRefB}
othernodeObj = &api.Node{ObjectMeta: metav1.ObjectMeta{Name: "othernode"}}
coremymirrorpod, v1mymirrorpod = makeTestPod("ns", "mymirrorpod", "mynode", true)
coreothermirrorpod, v1othermirrorpod = makeTestPod("ns", "othermirrorpod", "othernode", true)
@ -1167,6 +1173,24 @@ func Test_nodePlugin_Admit(t *testing.T) {
attributes: admission.NewAttributesRecord(setForbiddenUpdateLabels(mynodeObj, "new"), setForbiddenUpdateLabels(mynodeObj, "old"), nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, &metav1.UpdateOptions{}, false, mynode),
err: `is not allowed to modify labels: foo.node-restriction.kubernetes.io/foo, node-restriction.kubernetes.io/foo, other.k8s.io/foo, other.kubernetes.io/foo`,
},
{
name: "forbid update of my node: add owner reference",
podsGetter: existingPods,
attributes: admission.NewAttributesRecord(mynodeObjOwnerRefA, mynodeObj, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, &metav1.UpdateOptions{}, false, mynode),
err: "node \"mynode\" is not allowed to modify ownerReferences",
},
{
name: "forbid update of my node: remove owner reference",
podsGetter: existingPods,
attributes: admission.NewAttributesRecord(mynodeObj, mynodeObjOwnerRefA, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, &metav1.UpdateOptions{}, false, mynode),
err: "node \"mynode\" is not allowed to modify ownerReferences",
},
{
name: "forbid update of my node: change owner reference",
podsGetter: existingPods,
attributes: admission.NewAttributesRecord(mynodeObjOwnerRefA, mynodeObjOwnerRefB, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, &metav1.UpdateOptions{}, false, mynode),
err: "node \"mynode\" is not allowed to modify ownerReferences",
},
// Other node object
{