126 lines
3.5 KiB
Go
126 lines
3.5 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes 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 signer implements a CA signer that uses keys stored on local disk.
|
|
package signer
|
|
|
|
import (
|
|
"context"
|
|
"encoding/pem"
|
|
"fmt"
|
|
"time"
|
|
|
|
capi "k8s.io/api/certificates/v1beta1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apiserver/pkg/server/dynamiccertificates"
|
|
certificatesinformers "k8s.io/client-go/informers/certificates/v1beta1"
|
|
clientset "k8s.io/client-go/kubernetes"
|
|
capihelper "k8s.io/kubernetes/pkg/apis/certificates/v1beta1"
|
|
"k8s.io/kubernetes/pkg/controller/certificates"
|
|
"k8s.io/kubernetes/pkg/controller/certificates/authority"
|
|
)
|
|
|
|
type CSRSigningController struct {
|
|
certificateController *certificates.CertificateController
|
|
dynamicCertReloader dynamiccertificates.ControllerRunner
|
|
}
|
|
|
|
func NewCSRSigningController(
|
|
client clientset.Interface,
|
|
csrInformer certificatesinformers.CertificateSigningRequestInformer,
|
|
caFile, caKeyFile string,
|
|
certTTL time.Duration,
|
|
) (*CSRSigningController, error) {
|
|
signer, err := newSigner(caFile, caKeyFile, client, certTTL)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &CSRSigningController{
|
|
certificateController: certificates.NewCertificateController(
|
|
"csrsigning",
|
|
client,
|
|
csrInformer,
|
|
signer.handle,
|
|
),
|
|
dynamicCertReloader: signer.caProvider.caLoader,
|
|
}, nil
|
|
}
|
|
|
|
// Run the main goroutine responsible for watching and syncing jobs.
|
|
func (c *CSRSigningController) Run(workers int, stopCh <-chan struct{}) {
|
|
go c.dynamicCertReloader.Run(workers, stopCh)
|
|
|
|
c.certificateController.Run(workers, stopCh)
|
|
}
|
|
|
|
type signer struct {
|
|
caProvider *caProvider
|
|
|
|
client clientset.Interface
|
|
certTTL time.Duration
|
|
}
|
|
|
|
func newSigner(caFile, caKeyFile string, client clientset.Interface, certificateDuration time.Duration) (*signer, error) {
|
|
caProvider, err := newCAProvider(caFile, caKeyFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ret := &signer{
|
|
caProvider: caProvider,
|
|
client: client,
|
|
certTTL: certificateDuration,
|
|
}
|
|
return ret, nil
|
|
}
|
|
|
|
func (s *signer) handle(csr *capi.CertificateSigningRequest) error {
|
|
if !certificates.IsCertificateRequestApproved(csr) {
|
|
return nil
|
|
}
|
|
csr, err := s.sign(csr)
|
|
if err != nil {
|
|
return fmt.Errorf("error auto signing csr: %v", err)
|
|
}
|
|
_, err = s.client.CertificatesV1beta1().CertificateSigningRequests().UpdateStatus(context.TODO(), csr, metav1.UpdateOptions{})
|
|
if err != nil {
|
|
return fmt.Errorf("error updating signature for csr: %v", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *signer) sign(csr *capi.CertificateSigningRequest) (*capi.CertificateSigningRequest, error) {
|
|
x509cr, err := capihelper.ParseCSR(csr)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("unable to parse csr %q: %v", csr.Name, err)
|
|
}
|
|
|
|
currCA, err := s.caProvider.currentCA()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
der, err := currCA.Sign(x509cr.Raw, authority.PermissiveSigningPolicy{
|
|
TTL: s.certTTL,
|
|
Usages: csr.Spec.Usages,
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
csr.Status.Certificate = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: der})
|
|
return csr, nil
|
|
}
|