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webhook.go
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webhook.go
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/*
Copyright 2021 The Kubermatic Kubernetes Platform contributors.
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 operatingsystemmanager
import (
"crypto/x509"
"fmt"
"k8c.io/kubermatic/v3/pkg/resources"
"k8c.io/kubermatic/v3/pkg/resources/certificates/triple"
osmv1alpha1 "k8c.io/operating-system-manager/pkg/crd/osm/v1alpha1"
"k8c.io/reconciler/pkg/reconciling"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
rbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/pointer"
)
const (
webhookClusterRoleName = "kubermatic:operating-system-manager-webhook"
webhookClusterRoleBindingName = "kubermatic:operating-system-manager-webhook"
clusterAPIGroup = "cluster.k8s.io"
clusterAPIVersion = "v1alpha1"
)
func WebhookClusterRoleReconciler() reconciling.NamedClusterRoleReconcilerFactory {
return func() (string, reconciling.ClusterRoleReconciler) {
return webhookClusterRoleName, func(cr *rbacv1.ClusterRole) (*rbacv1.ClusterRole, error) {
cr.Rules = []rbacv1.PolicyRule{
{
APIGroups: []string{"operatingsystemmanager.k8c.io"},
Resources: []string{"operatingsystemprofiles"},
Verbs: []string{"get", "list", "watch"},
},
{
APIGroups: []string{"coordination.k8s.io"},
Resources: []string{"leases"},
Verbs: []string{"create", "update", "get", "list", "watch"},
ResourceNames: []string{"operating-system-manager-leader-lock"},
},
}
return cr, nil
}
}
}
func WebhookClusterRoleBindingReconciler() reconciling.NamedClusterRoleBindingReconcilerFactory {
return func() (string, reconciling.ClusterRoleBindingReconciler) {
return webhookClusterRoleBindingName, func(crb *rbacv1.ClusterRoleBinding) (*rbacv1.ClusterRoleBinding, error) {
crb.RoleRef = rbacv1.RoleRef{
Name: webhookClusterRoleName,
Kind: "ClusterRole",
APIGroup: rbacv1.GroupName,
}
crb.Subjects = []rbacv1.Subject{
{
Kind: rbacv1.UserKind,
APIGroup: rbacv1.GroupName,
Name: resources.OperatingSystemManagerWebhookCertUsername,
},
}
return crb, nil
}
}
}
// MutatingwebhookConfigurationReconciler returns the MutatingwebhookConfiguration for OSM.
func MutatingwebhookConfigurationReconciler(caCert *x509.Certificate, namespace string) reconciling.NamedMutatingWebhookConfigurationReconcilerFactory {
return func() (string, reconciling.MutatingWebhookConfigurationReconciler) {
return resources.OperatingSystemManagerMutatingWebhookConfigurationName, func(mutatingWebhookConfiguration *admissionregistrationv1.MutatingWebhookConfiguration) (*admissionregistrationv1.MutatingWebhookConfiguration, error) {
failurePolicy := admissionregistrationv1.Fail
sideEffects := admissionregistrationv1.SideEffectClassNone
mdURL := fmt.Sprintf("https://%s.%s.svc.cluster.local./mutate-v1alpha1-machinedeployment", resources.OperatingSystemManagerWebhookServiceName, namespace)
reviewVersions := []string{"v1", "v1beta1"}
// This only gets set when the APIServer supports it, so carry it over
var scope *admissionregistrationv1.ScopeType
if len(mutatingWebhookConfiguration.Webhooks) != 1 {
mutatingWebhookConfiguration.Webhooks = []admissionregistrationv1.MutatingWebhook{{}}
} else if len(mutatingWebhookConfiguration.Webhooks[0].Rules) > 0 {
scope = mutatingWebhookConfiguration.Webhooks[0].Rules[0].Scope
}
mutatingWebhookConfiguration.Webhooks[0].Name = fmt.Sprintf("%s-machinedeployments", resources.OperatingSystemManagerMutatingWebhookConfigurationName)
mutatingWebhookConfiguration.Webhooks[0].NamespaceSelector = &metav1.LabelSelector{}
mutatingWebhookConfiguration.Webhooks[0].SideEffects = &sideEffects
mutatingWebhookConfiguration.Webhooks[0].FailurePolicy = &failurePolicy
mutatingWebhookConfiguration.Webhooks[0].AdmissionReviewVersions = reviewVersions
mutatingWebhookConfiguration.Webhooks[0].Rules = []admissionregistrationv1.RuleWithOperations{{
Operations: []admissionregistrationv1.OperationType{admissionregistrationv1.Create, admissionregistrationv1.Update},
Rule: admissionregistrationv1.Rule{
APIGroups: []string{clusterAPIGroup},
APIVersions: []string{clusterAPIVersion},
Resources: []string{"machinedeployments"},
Scope: scope,
},
}}
mutatingWebhookConfiguration.Webhooks[0].ClientConfig = admissionregistrationv1.WebhookClientConfig{
URL: &mdURL,
CABundle: triple.EncodeCertPEM(caCert),
}
return mutatingWebhookConfiguration, nil
}
}
}
// ValidatingwebhookConfigurationReconciler returns the ValidatingwebhookConfiguration for OSM.
func ValidatingWebhookConfigurationReconciler(caCert *x509.Certificate, namespace string) reconciling.NamedValidatingWebhookConfigurationReconcilerFactory {
return func() (string, reconciling.ValidatingWebhookConfigurationReconciler) {
return resources.OperatingSystemManagerValidatingWebhookConfigurationName, func(validatingWebhookConfiguration *admissionregistrationv1.ValidatingWebhookConfiguration) (*admissionregistrationv1.ValidatingWebhookConfiguration, error) {
matchPolicy := admissionregistrationv1.Exact
failurePolicy := admissionregistrationv1.Fail
sideEffects := admissionregistrationv1.SideEffectClassNone
scope := admissionregistrationv1.AllScopes
caBundle := triple.EncodeCertPEM(caCert)
ospURL := fmt.Sprintf("https://%s.%s.svc.cluster.local./operatingsystemprofile", resources.OperatingSystemManagerWebhookServiceName, namespace)
oscURL := fmt.Sprintf("https://%s.%s.svc.cluster.local./operatingsystemconfig", resources.OperatingSystemManagerWebhookServiceName, namespace)
validatingWebhookConfiguration.Webhooks = []admissionregistrationv1.ValidatingWebhook{
{
Name: "operatingsystemprofiles.operatingsystemmanager.k8c.io", // this should be a FQDN
AdmissionReviewVersions: []string{admissionregistrationv1.SchemeGroupVersion.Version, admissionregistrationv1beta1.SchemeGroupVersion.Version},
MatchPolicy: &matchPolicy,
FailurePolicy: &failurePolicy,
SideEffects: &sideEffects,
TimeoutSeconds: pointer.Int32(30),
ClientConfig: admissionregistrationv1.WebhookClientConfig{
CABundle: caBundle,
URL: &ospURL,
},
ObjectSelector: &metav1.LabelSelector{},
NamespaceSelector: &metav1.LabelSelector{},
Rules: []admissionregistrationv1.RuleWithOperations{
{
Rule: admissionregistrationv1.Rule{
APIGroups: []string{osmv1alpha1.GroupName},
APIVersions: []string{"*"},
Resources: []string{"operatingsystemprofiles"},
Scope: &scope,
},
Operations: []admissionregistrationv1.OperationType{
admissionregistrationv1.Create,
admissionregistrationv1.Update,
},
},
},
},
{
Name: "operatingsystemconfigs.operatingsystemmanager.k8c.io", // this should be a FQDN
AdmissionReviewVersions: []string{admissionregistrationv1.SchemeGroupVersion.Version, admissionregistrationv1beta1.SchemeGroupVersion.Version},
MatchPolicy: &matchPolicy,
FailurePolicy: &failurePolicy,
SideEffects: &sideEffects,
TimeoutSeconds: pointer.Int32(30),
ClientConfig: admissionregistrationv1.WebhookClientConfig{
CABundle: caBundle,
URL: &oscURL,
},
ObjectSelector: &metav1.LabelSelector{},
NamespaceSelector: &metav1.LabelSelector{},
Rules: []admissionregistrationv1.RuleWithOperations{
{
Rule: admissionregistrationv1.Rule{
APIGroups: []string{osmv1alpha1.GroupName},
APIVersions: []string{"*"},
Resources: []string{"operatingsystemconfigs"},
Scope: &scope,
},
Operations: []admissionregistrationv1.OperationType{
admissionregistrationv1.Create,
admissionregistrationv1.Update,
},
},
},
},
}
return validatingWebhookConfiguration, nil
}
}
}