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matcher.go
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matcher.go
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// Copyright 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package matchers
import (
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
appsv1 "k8s.io/api/apps/v1"
appsv1beta1 "k8s.io/api/apps/v1beta1"
appsv1beta2 "k8s.io/api/apps/v1beta2"
certificatesv1 "k8s.io/api/certificates/v1"
coordinationv1 "k8s.io/api/coordination/v1"
coordinationv1beta1 "k8s.io/api/coordination/v1beta1"
corev1 "k8s.io/api/core/v1"
extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
networkingv1 "k8s.io/api/networking/v1"
networkingv1beta1 "k8s.io/api/networking/v1beta1"
policyv1beta1 "k8s.io/api/policy/v1beta1"
rbacv1 "k8s.io/api/rbac/v1"
rbacv1alpha1 "k8s.io/api/rbac/v1alpha1"
rbacv1beta1 "k8s.io/api/rbac/v1beta1"
schedulingv1 "k8s.io/api/scheduling/v1"
schedulingv1alpha1 "k8s.io/api/scheduling/v1alpha1"
schedulingv1beta1 "k8s.io/api/scheduling/v1beta1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
apiextensionsv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
apiregistrationv1 "k8s.io/kube-aggregator/pkg/apis/apiregistration/v1"
apiregistrationv1beta1 "k8s.io/kube-aggregator/pkg/apis/apiregistration/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/utils/managedresources"
)
var (
defaultNamespaceLabels = labels.Set{
corev1.LabelMetadataName: metav1.NamespaceDefault,
}
kubeSystemNamespaceLabels = labels.Set{
v1beta1constants.ShootNoCleanup: "true",
v1beta1constants.GardenerPurpose: metav1.NamespaceSystem,
corev1.LabelMetadataName: metav1.NamespaceSystem,
}
podsLabels = labels.Set{
v1beta1constants.ShootNoCleanup: "true",
managedresources.LabelKeyOrigin: managedresources.LabelValueGardener,
}
// WebhookConstraintMatchersForLeases contains a list of lease API resources that can break
// leader election of essential control plane controllers.
WebhookConstraintMatchersForLeases = []WebhookConstraintMatcher{
// object selector here is added to support the use case described in - https://github.com/gardener/gardener/pull/8034
{GVR: coordinationv1.SchemeGroupVersion.WithResource("leases"), NamespaceLabels: kubeSystemNamespaceLabels, ObjectLabels: labels.Set{}},
{GVR: coordinationv1beta1.SchemeGroupVersion.WithResource("leases"), NamespaceLabels: kubeSystemNamespaceLabels, ObjectLabels: labels.Set{}},
}
// WebhookConstraintMatchers contains a list of all api resources which can break
// the waking up of a cluster.
WebhookConstraintMatchers = []WebhookConstraintMatcher{
{GVR: corev1.SchemeGroupVersion.WithResource("pods"), NamespaceLabels: kubeSystemNamespaceLabels, ObjectLabels: podsLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("pods"), NamespaceLabels: kubeSystemNamespaceLabels, ObjectLabels: podsLabels, Subresource: "status"},
// Leader election of kube-controller-manager, kube-scheduler, cloud-controller-manager, cluster-autoscaler, ...
{GVR: corev1.SchemeGroupVersion.WithResource("configmaps"), NamespaceLabels: kubeSystemNamespaceLabels},
// kube-system and default namespaces for leader election and apiserver in-cluster discovery.
{GVR: corev1.SchemeGroupVersion.WithResource("endpoints"), NamespaceLabels: defaultNamespaceLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("endpoints"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("secrets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("serviceaccounts"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("services"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("services"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
// Match services in the `default` namespace because the `kubernetes` service is essential for in-cluster communication.
// Unfortunately, it's not possible to restrict the match to this specific service since a remediated webhook on services
// would widen the scope, i.e. the webhook will have a combination of namespace and object selectors.
{GVR: corev1.SchemeGroupVersion.WithResource("services"), NamespaceLabels: defaultNamespaceLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("services"), NamespaceLabels: defaultNamespaceLabels, Subresource: "status"},
// Kubelet must be allowed to register itself.
{GVR: corev1.SchemeGroupVersion.WithResource("nodes"), ClusterScoped: true},
{GVR: corev1.SchemeGroupVersion.WithResource("nodes"), ClusterScoped: true, Subresource: "status"},
// Needed for gardener-resource-manager to update "kube-system" namespace labels.
{GVR: corev1.SchemeGroupVersion.WithResource("namespaces"), ClusterScoped: true, ObjectLabels: kubeSystemNamespaceLabels, NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: corev1.SchemeGroupVersion.WithResource("namespaces"), ClusterScoped: true, ObjectLabels: kubeSystemNamespaceLabels, NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: appsv1.SchemeGroupVersion.WithResource("controllerrevisions"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: appsv1.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: appsv1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: appsv1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("controllerrevisions"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: appsv1beta1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("controllerrevisions"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: appsv1beta2.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("controllerrevisions"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("daemonsets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("deployments"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "status"},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("replicasets"), NamespaceLabels: kubeSystemNamespaceLabels, Subresource: "scale"},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("networkpolicies"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: extensionsv1beta1.SchemeGroupVersion.WithResource("podsecuritypolicies"), ClusterScoped: true},
// Needed for kubelet and kube-system controllers leader election.
{GVR: coordinationv1.SchemeGroupVersion.WithResource("leases")},
{GVR: coordinationv1beta1.SchemeGroupVersion.WithResource("leases")},
// Modifications might be needed for old clusters with new policies.
{GVR: networkingv1.SchemeGroupVersion.WithResource("networkpolicies"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: networkingv1beta1.SchemeGroupVersion.WithResource("networkpolicies"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: policyv1beta1.SchemeGroupVersion.WithResource("podsecuritypolicies"), ClusterScoped: true},
// Needed as part of /readyz/poststarthook/rbac/bootstrap-roles in kube-apiserver.
{GVR: rbacv1.SchemeGroupVersion.WithResource("clusterroles"), ClusterScoped: true},
{GVR: rbacv1.SchemeGroupVersion.WithResource("clusterrolebindings"), ClusterScoped: true},
{GVR: rbacv1.SchemeGroupVersion.WithResource("roles"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: rbacv1.SchemeGroupVersion.WithResource("rolebindings"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: rbacv1alpha1.SchemeGroupVersion.WithResource("clusterroles"), ClusterScoped: true},
{GVR: rbacv1alpha1.SchemeGroupVersion.WithResource("clusterrolebindings"), ClusterScoped: true},
{GVR: rbacv1alpha1.SchemeGroupVersion.WithResource("roles"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: rbacv1alpha1.SchemeGroupVersion.WithResource("rolebindings"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: rbacv1beta1.SchemeGroupVersion.WithResource("clusterroles"), ClusterScoped: true},
{GVR: rbacv1beta1.SchemeGroupVersion.WithResource("clusterrolebindings"), ClusterScoped: true},
{GVR: rbacv1beta1.SchemeGroupVersion.WithResource("roles"), NamespaceLabels: kubeSystemNamespaceLabels},
{GVR: rbacv1beta1.SchemeGroupVersion.WithResource("rolebindings"), NamespaceLabels: kubeSystemNamespaceLabels},
// Needed for networking extensions.
{GVR: apiextensionsv1.SchemeGroupVersion.WithResource("customresourcedefinitions"), ClusterScoped: true},
{GVR: apiextensionsv1.SchemeGroupVersion.WithResource("customresourcedefinitions"), ClusterScoped: true, Subresource: "status"},
{GVR: apiextensionsv1beta1.SchemeGroupVersion.WithResource("customresourcedefinitions"), ClusterScoped: true},
{GVR: apiextensionsv1beta1.SchemeGroupVersion.WithResource("customresourcedefinitions"), ClusterScoped: true, Subresource: "status"},
// Needed as part of /healthz/poststarthook/apiservice-openapi-controller in kube-apiserver.
{GVR: apiregistrationv1.SchemeGroupVersion.WithResource("apiservices"), ClusterScoped: true},
{GVR: apiregistrationv1.SchemeGroupVersion.WithResource("apiservices"), ClusterScoped: true, Subresource: "status"},
{GVR: apiregistrationv1beta1.SchemeGroupVersion.WithResource("apiservices"), ClusterScoped: true},
{GVR: apiregistrationv1beta1.SchemeGroupVersion.WithResource("apiservices"), ClusterScoped: true, Subresource: "status"},
// Kubelet uses it to request a certificate for itself.
{GVR: certificatesv1.SchemeGroupVersion.WithResource("certificatesigningrequests"), ClusterScoped: true},
{GVR: certificatesv1.SchemeGroupVersion.WithResource("certificatesigningrequests"), ClusterScoped: true, Subresource: "status"},
{GVR: certificatesv1.SchemeGroupVersion.WithResource("certificatesigningrequests"), ClusterScoped: true, Subresource: "approval"},
// Needed as part of /healthz/poststarthook/scheduling/bootstrap-system-priority-classes in kube-apiserver.
{GVR: schedulingv1.SchemeGroupVersion.WithResource("priorityclasses"), ClusterScoped: true},
{GVR: schedulingv1alpha1.SchemeGroupVersion.WithResource("priorityclasses"), ClusterScoped: true},
{GVR: schedulingv1beta1.SchemeGroupVersion.WithResource("priorityclasses"), ClusterScoped: true},
}
)
// selectors in webhooks are defaulted to matchAll selector.
func defaultEmptySelector(ls *metav1.LabelSelector) (labels.Selector, error) {
if ls == nil {
ls = &metav1.LabelSelector{}
}
return metav1.LabelSelectorAsSelector(ls)
}
// WebhookConstraintMatcher contains an api resource matcher.
type WebhookConstraintMatcher struct {
GVR schema.GroupVersionResource
Subresource string
ClusterScoped bool
ObjectLabels labels.Set
NamespaceLabels labels.Set
}
// Match rule with objLabelSelector and namespaceLabelSelector if
// the resource is not namespaced.
func (w *WebhookConstraintMatcher) Match(
r admissionregistrationv1.RuleWithOperations,
objLabelSelector *metav1.LabelSelector,
namespaceLabelSelector *metav1.LabelSelector,
) bool {
var (
objLabels = w.ObjectLabels
nsLabels = w.NamespaceLabels
matchAllObjects = objLabels == nil
matchAllNamespaces = nsLabels == nil
)
nsSelector, err := defaultEmptySelector(namespaceLabelSelector)
if err != nil {
// this should really not happen
return true
}
objSelector, err := defaultEmptySelector(objLabelSelector)
if err != nil {
// this should really not happen
return true
}
matchObj := matchAllObjects || objSelector.Empty() || objSelector.Matches(objLabels)
matchNS := matchAllNamespaces || nsSelector.Empty() || nsSelector.Matches(nsLabels)
rm := ruleMatcher{rule: r, gvr: w.GVR, subresource: w.Subresource}
if !w.ClusterScoped {
rm.namespace = "dummy"
}
// namespaceSelector can be used to select namespace objects (although the namespace is cluster-scoped resource)
if w.GVR == namespaceResource {
return matchObj && matchNS && rm.Matches()
}
return matchObj && (w.ClusterScoped || matchNS) && rm.Matches()
}