/
clusterspiffeid_webhook.go
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/
clusterspiffeid_webhook.go
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/*
Copyright 2021 SPIRE Authors.
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 v1alpha1
import (
"errors"
"fmt"
"text/template"
"time"
"github.com/spiffe/go-spiffe/v2/spiffeid"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
ctrl "sigs.k8s.io/controller-runtime"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/webhook"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
)
const (
dnsNameTemplateName = "dnsNameTemplate"
spiffeIDTemplateName = "spiffeIDTemplate"
workloadSelectorTemplateName = "workloadSelectorTemplate"
)
// log is for logging in this package.
var clusterspiffeidlog = logf.Log.WithName("clusterspiffeid-resource")
func (r *ClusterSPIFFEID) SetupWebhookWithManager(mgr ctrl.Manager) error {
return ctrl.NewWebhookManagedBy(mgr).
For(r).
Complete()
}
// TODO(user): EDIT THIS FILE! THIS IS SCAFFOLDING FOR YOU TO OWN!
// TODO(user): change verbs to "verbs=create;update;delete" if you want to enable deletion validation.
//+kubebuilder:webhook:path=/validate-spire-spiffe-io-v1alpha1-clusterspiffeid,mutating=false,failurePolicy=fail,sideEffects=None,groups=spire.spiffe.io,resources=clusterspiffeids,verbs=create;update,versions=v1alpha1,name=vclusterspiffeid.kb.io,admissionReviewVersions=v1
var _ webhook.Validator = &ClusterSPIFFEID{}
// ValidateCreate implements webhook.Validator so a webhook will be registered for the type
func (r *ClusterSPIFFEID) ValidateCreate() (admission.Warnings, error) {
clusterspiffeidlog.Info("validate create", "name", r.Name)
return r.validate()
}
// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type
func (r *ClusterSPIFFEID) ValidateUpdate(runtime.Object) (admission.Warnings, error) {
clusterspiffeidlog.Info("validate update", "name", r.Name)
return r.validate()
}
// ValidateDelete implements webhook.Validator so a webhook will be registered for the type
func (r *ClusterSPIFFEID) ValidateDelete() (admission.Warnings, error) {
// Deletes are not validated.
return nil, nil
}
func (r *ClusterSPIFFEID) validate() (admission.Warnings, error) {
_, err := ParseClusterSPIFFEIDSpec(&r.Spec)
return nil, err
}
// +kubebuilder:object:generate=false
// ParsedClusterSPIFFEIDSpec is a parsed and validated ClusterSPIFFEIDSpec
type ParsedClusterSPIFFEIDSpec struct {
SPIFFEIDTemplate *template.Template
NamespaceSelector labels.Selector
PodSelector labels.Selector
TTL time.Duration
JWTTTL time.Duration
FederatesWith []spiffeid.TrustDomain
DNSNameTemplates []*template.Template
WorkloadSelectorTemplates []*template.Template
Admin bool
Downstream bool
AutoPopulateDNSNames bool
}
// ParseClusterSPIFFEIDSpec parses and validates the fields in the ClusterSPIFFEIDSpec
func ParseClusterSPIFFEIDSpec(spec *ClusterSPIFFEIDSpec) (*ParsedClusterSPIFFEIDSpec, error) {
if spec.SPIFFEIDTemplate == "" {
return nil, errors.New("empty SPIFFEID template")
}
spiffeIDTemplate, err := template.New(spiffeIDTemplateName).Parse(spec.SPIFFEIDTemplate)
if err != nil {
return nil, fmt.Errorf("invalid SPIFFEID template: %w", err)
}
var namespaceSelector labels.Selector
if spec.NamespaceSelector != nil {
namespaceSelector, err = metav1.LabelSelectorAsSelector(spec.NamespaceSelector)
if err != nil {
return nil, err
}
}
var podSelector labels.Selector
if spec.PodSelector != nil {
podSelector, err = metav1.LabelSelectorAsSelector(spec.PodSelector)
if err != nil {
return nil, err
}
}
federatesWith := make([]spiffeid.TrustDomain, 0, len(spec.FederatesWith))
for _, value := range spec.FederatesWith {
td, err := spiffeid.TrustDomainFromString(value)
if err != nil {
return nil, fmt.Errorf("invalid federatesWith value: %w", err)
}
federatesWith = append(federatesWith, td)
}
var dnsNameTemplates []*template.Template
for _, value := range spec.DNSNameTemplates {
dnsNameTemplate, err := template.New(dnsNameTemplateName).Parse(value)
if err != nil {
return nil, fmt.Errorf("invalid dnsNameTemplate value: %w", err)
}
dnsNameTemplates = append(dnsNameTemplates, dnsNameTemplate)
}
var workloadSelectorTemplates []*template.Template
for _, value := range spec.WorkloadSelectorTemplates {
workloadSelectorTemplate, err := template.New(workloadSelectorTemplateName).Parse(value)
if err != nil {
return nil, fmt.Errorf("invalid workloadSelectorTemplates value: %w", err)
}
workloadSelectorTemplates = append(workloadSelectorTemplates, workloadSelectorTemplate)
}
return &ParsedClusterSPIFFEIDSpec{
SPIFFEIDTemplate: spiffeIDTemplate,
NamespaceSelector: namespaceSelector,
PodSelector: podSelector,
TTL: spec.TTL.Duration,
JWTTTL: spec.JWTTTL.Duration,
FederatesWith: federatesWith,
DNSNameTemplates: dnsNameTemplates,
WorkloadSelectorTemplates: workloadSelectorTemplates,
Admin: spec.Admin,
Downstream: spec.Downstream,
AutoPopulateDNSNames: spec.AutoPopulateDNSNames,
}, nil
}