mirror of https://github.com/k3s-io/k3s
139 lines
3.8 KiB
Go
139 lines
3.8 KiB
Go
/*
|
|
Copyright 2016 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 (
|
|
"crypto"
|
|
"crypto/x509"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"time"
|
|
|
|
capi "k8s.io/api/certificates/v1beta1"
|
|
certificatesinformers "k8s.io/client-go/informers/certificates/v1beta1"
|
|
clientset "k8s.io/client-go/kubernetes"
|
|
"k8s.io/kubernetes/pkg/controller/certificates"
|
|
|
|
"github.com/cloudflare/cfssl/config"
|
|
"github.com/cloudflare/cfssl/helpers"
|
|
"github.com/cloudflare/cfssl/signer"
|
|
"github.com/cloudflare/cfssl/signer/local"
|
|
)
|
|
|
|
func NewCSRSigningController(
|
|
client clientset.Interface,
|
|
csrInformer certificatesinformers.CertificateSigningRequestInformer,
|
|
caFile, caKeyFile string,
|
|
certificateDuration time.Duration,
|
|
) (*certificates.CertificateController, error) {
|
|
signer, err := newCFSSLSigner(caFile, caKeyFile, client, certificateDuration)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return certificates.NewCertificateController(
|
|
client,
|
|
csrInformer,
|
|
signer.handle,
|
|
), nil
|
|
}
|
|
|
|
type cfsslSigner struct {
|
|
ca *x509.Certificate
|
|
priv crypto.Signer
|
|
sigAlgo x509.SignatureAlgorithm
|
|
client clientset.Interface
|
|
certificateDuration time.Duration
|
|
}
|
|
|
|
func newCFSSLSigner(caFile, caKeyFile string, client clientset.Interface, certificateDuration time.Duration) (*cfsslSigner, error) {
|
|
ca, err := ioutil.ReadFile(caFile)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error reading CA cert file %q: %v", caFile, err)
|
|
}
|
|
cakey, err := ioutil.ReadFile(caKeyFile)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error reading CA key file %q: %v", caKeyFile, err)
|
|
}
|
|
|
|
parsedCa, err := helpers.ParseCertificatePEM(ca)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing CA cert file %q: %v", caFile, err)
|
|
}
|
|
|
|
strPassword := os.Getenv("CFSSL_CA_PK_PASSWORD")
|
|
password := []byte(strPassword)
|
|
if strPassword == "" {
|
|
password = nil
|
|
}
|
|
|
|
priv, err := helpers.ParsePrivateKeyPEMWithPassword(cakey, password)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Malformed private key %v", err)
|
|
}
|
|
return &cfsslSigner{
|
|
priv: priv,
|
|
ca: parsedCa,
|
|
sigAlgo: signer.DefaultSigAlgo(priv),
|
|
client: client,
|
|
certificateDuration: certificateDuration,
|
|
}, nil
|
|
}
|
|
|
|
func (s *cfsslSigner) 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.Certificates().CertificateSigningRequests().UpdateStatus(csr)
|
|
if err != nil {
|
|
return fmt.Errorf("error updating signature for csr: %v", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *cfsslSigner) sign(csr *capi.CertificateSigningRequest) (*capi.CertificateSigningRequest, error) {
|
|
var usages []string
|
|
for _, usage := range csr.Spec.Usages {
|
|
usages = append(usages, string(usage))
|
|
}
|
|
policy := &config.Signing{
|
|
Default: &config.SigningProfile{
|
|
Usage: usages,
|
|
Expiry: s.certificateDuration,
|
|
ExpiryString: s.certificateDuration.String(),
|
|
},
|
|
}
|
|
cfs, err := local.NewSigner(s.priv, s.ca, s.sigAlgo, policy)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
csr.Status.Certificate, err = cfs.Sign(signer.SignRequest{
|
|
Request: string(csr.Spec.Request),
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return csr, nil
|
|
}
|