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Prevent nodes from updating taints

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This commit is contained in:
Jordan Liggitt 2018-04-25 17:02:26 -04:00
parent bd0d093701
commit 15bcfd5e00
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GPG Key ID: 39928704103C7229
2 changed files with 39 additions and 1 deletions
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6
plugin/pkg/admission/noderestriction/admission.go
View File

@ -338,6 +338,12 @@ func (c *nodePlugin) admitNode(nodeName string, a admission.Attributes) error {
if node.Spec.ConfigSource != nil && !apiequality.Semantic.DeepEqual(node.Spec.ConfigSource, oldNode.Spec.ConfigSource) { if node.Spec.ConfigSource != nil && !apiequality.Semantic.DeepEqual(node.Spec.ConfigSource, oldNode.Spec.ConfigSource) {
return admission.NewForbidden(a, fmt.Errorf("cannot update configSource to a new non-nil configSource")) return admission.NewForbidden(a, fmt.Errorf("cannot update configSource to a new non-nil configSource"))
} }
// Don't allow a node to update its own taints. This would allow a node to remove or modify its
// taints in a way that would let it steer disallowed workloads to itself.
if !apiequality.Semantic.DeepEqual(node.Spec.Taints, oldNode.Spec.Taints) {
return admission.NewForbidden(a, fmt.Errorf("cannot modify taints"))
}
} }
return nil return nil

34
plugin/pkg/admission/noderestriction/admission_test.go
View File

@ -105,7 +105,9 @@ func Test_nodePlugin_Admit(t *testing.T) {
UID: "quxUID", UID: "quxUID",
KubeletConfigKey: "kubelet", KubeletConfigKey: "kubelet",
}}}} }}}}
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"}}}}
othernodeObj = &api.Node{ObjectMeta: metav1.ObjectMeta{Name: "othernode"}}
mymirrorpod = makeTestPod("ns", "mymirrorpod", "mynode", true) mymirrorpod = makeTestPod("ns", "mymirrorpod", "mynode", true)
othermirrorpod = makeTestPod("ns", "othermirrorpod", "othernode", true) othermirrorpod = makeTestPod("ns", "othermirrorpod", "othernode", true)
@ -633,6 +635,12 @@ func Test_nodePlugin_Admit(t *testing.T) {
attributes: admission.NewAttributesRecord(mynodeObj, nil, nodeKind, mynodeObj.Namespace, "", nodeResource, "", admission.Create, mynode), attributes: admission.NewAttributesRecord(mynodeObj, nil, nodeKind, mynodeObj.Namespace, "", nodeResource, "", admission.Create, mynode),
err: "", err: "",
}, },
{
name: "allow create of my node with taints",
podsGetter: noExistingPods,
attributes: admission.NewAttributesRecord(mynodeObjTaintA, nil, nodeKind, mynodeObj.Namespace, "", nodeResource, "", admission.Create, mynode),
err: "",
},
{ {
name: "allow update of my node", name: "allow update of my node",
podsGetter: existingPods, podsGetter: existingPods,
@ -681,6 +689,30 @@ func Test_nodePlugin_Admit(t *testing.T) {
attributes: admission.NewAttributesRecord(mynodeObj, mynodeObjConfigA, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, mynode), attributes: admission.NewAttributesRecord(mynodeObj, mynodeObjConfigA, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, mynode),
err: "", err: "",
}, },
{
name: "allow update of my node: no change to taints",
podsGetter: existingPods,
attributes: admission.NewAttributesRecord(mynodeObjTaintA, mynodeObjTaintA, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, mynode),
err: "",
},
{
name: "forbid update of my node: add taints",
podsGetter: existingPods,
attributes: admission.NewAttributesRecord(mynodeObjTaintA, mynodeObj, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, mynode),
err: "cannot modify taints",
},
{
name: "forbid update of my node: remove taints",
podsGetter: existingPods,
attributes: admission.NewAttributesRecord(mynodeObj, mynodeObjTaintA, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, mynode),
err: "cannot modify taints",
},
{
name: "forbid update of my node: change taints",
podsGetter: existingPods,
attributes: admission.NewAttributesRecord(mynodeObjTaintA, mynodeObjTaintB, nodeKind, mynodeObj.Namespace, mynodeObj.Name, nodeResource, "", admission.Update, mynode),
err: "cannot modify taints",
},
// Other node object // Other node object
{ {