mirror of https://github.com/k3s-io/k3s
130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package signer implements a CA signer that uses keys stored on local disk.
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package signer
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import (
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"crypto"
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"encoding/pem"
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"fmt"
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"io/ioutil"
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"time"
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capi "k8s.io/api/certificates/v1beta1"
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certificatesinformers "k8s.io/client-go/informers/certificates/v1beta1"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/util/cert"
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"k8s.io/client-go/util/keyutil"
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capihelper "k8s.io/kubernetes/pkg/apis/certificates/v1beta1"
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"k8s.io/kubernetes/pkg/controller/certificates"
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"k8s.io/kubernetes/pkg/controller/certificates/authority"
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)
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func NewCSRSigningController(
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client clientset.Interface,
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csrInformer certificatesinformers.CertificateSigningRequestInformer,
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caFile, caKeyFile string,
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certTTL time.Duration,
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) (*certificates.CertificateController, error) {
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signer, err := newSigner(caFile, caKeyFile, client, certTTL)
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if err != nil {
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return nil, err
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}
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return certificates.NewCertificateController(
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"csrsigning",
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client,
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csrInformer,
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signer.handle,
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), nil
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}
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type signer struct {
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ca *authority.CertificateAuthority
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client clientset.Interface
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certTTL time.Duration
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}
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func newSigner(caFile, caKeyFile string, client clientset.Interface, certificateDuration time.Duration) (*signer, error) {
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certPEM, err := ioutil.ReadFile(caFile)
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if err != nil {
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return nil, fmt.Errorf("error reading CA cert file %q: %v", caFile, err)
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}
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certs, err := cert.ParseCertsPEM(certPEM)
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if err != nil {
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return nil, fmt.Errorf("error reading CA cert file %q: %v", caFile, err)
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}
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if len(certs) != 1 {
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return nil, fmt.Errorf("error reading CA cert file %q: expected 1 certificate, found %d", caFile, len(certs))
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}
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keyPEM, err := ioutil.ReadFile(caKeyFile)
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if err != nil {
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return nil, fmt.Errorf("error reading CA key file %q: %v", caKeyFile, err)
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}
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key, err := keyutil.ParsePrivateKeyPEM(keyPEM)
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if err != nil {
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return nil, fmt.Errorf("error reading CA key file %q: %v", caKeyFile, err)
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}
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priv, ok := key.(crypto.Signer)
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if !ok {
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return nil, fmt.Errorf("error reading CA key file %q: key did not implement crypto.Signer", caKeyFile)
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}
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return &signer{
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ca: &authority.CertificateAuthority{
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Certificate: certs[0],
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PrivateKey: priv,
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Backdate: 5 * time.Minute,
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},
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client: client,
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certTTL: certificateDuration,
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}, nil
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}
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func (s *signer) handle(csr *capi.CertificateSigningRequest) error {
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if !certificates.IsCertificateRequestApproved(csr) {
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return nil
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}
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csr, err := s.sign(csr)
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if err != nil {
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return fmt.Errorf("error auto signing csr: %v", err)
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}
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_, err = s.client.CertificatesV1beta1().CertificateSigningRequests().UpdateStatus(csr)
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if err != nil {
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return fmt.Errorf("error updating signature for csr: %v", err)
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}
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return nil
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}
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func (s *signer) sign(csr *capi.CertificateSigningRequest) (*capi.CertificateSigningRequest, error) {
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x509cr, err := capihelper.ParseCSR(csr)
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if err != nil {
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return nil, fmt.Errorf("unable to parse csr %q: %v", csr.Name, err)
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}
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der, err := s.ca.Sign(x509cr.Raw, authority.PermissiveSigningPolicy{
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TTL: s.certTTL,
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Usages: csr.Spec.Usages,
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})
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if err != nil {
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return nil, err
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}
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csr.Status.Certificate = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: der})
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return csr, nil
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}
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