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Add ClusterInformation write-protection to webhook config #4499

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Add ClusterInformation write-protection to webhook config #4499

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0f00f53
Add ClusterInformation to ValidatingWebhookConfiguration
caseydavenport Mar 5, 2026
f4608dc
Use Ignore failure policy for ClusterInformation webhook
caseydavenport Mar 5, 2026
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32 changes: 32 additions & 0 deletions pkg/render/webhooks/render.go
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Original file line number Diff line number Diff line change
Expand Up @@ -299,6 +299,38 @@ func (c *component) Objects() ([]client.Object, []client.Object) {
TimeoutSeconds: ptr.To[int32](5),
FailurePolicy: ptr.To(admissionregistrationv1.Fail),
},
{
// This webhook blocks user writes to ClusterInformation, which is a read-only resource managed by
// Calico system components. This mirrors the write protection provided by the aggregated API server.
Name: "cluster-info.api.projectcalico.org",
Rules: []admissionregistrationv1.RuleWithOperations{
{
Operations: []admissionregistrationv1.OperationType{
admissionregistrationv1.Create,
admissionregistrationv1.Update,
admissionregistrationv1.Delete,
},
Rule: admissionregistrationv1.Rule{
APIGroups: []string{"projectcalico.org"},
APIVersions: []string{"v3"},
Resources: []string{"clusterinformations"},
Scope: ptr.To(admissionregistrationv1.AllScopes),
},
},
},
ClientConfig: admissionregistrationv1.WebhookClientConfig{
Service: &admissionregistrationv1.ServiceReference{
Namespace: common.CalicoNamespace,
Name: WebhooksName,
Path: ptr.To("/cluster-info"),
},
CABundle: c.cfg.KeyPair.GetCertificatePEM(),
},
AdmissionReviewVersions: []string{"v1"},
SideEffects: ptr.To(admissionregistrationv1.SideEffectClassNone),
TimeoutSeconds: ptr.To[int32](5),
FailurePolicy: ptr.To(admissionregistrationv1.Ignore),
},
{
// This webhook is for audit logging. The webhook controller will get events for all relevant Calico API types
// and product audit logs for them.
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