135 lines
4.3 KiB
Go
135 lines
4.3 KiB
Go
/*
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Copyright 2018 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 renewal
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import (
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"context"
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"crypto"
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"crypto/x509"
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"crypto/x509/pkix"
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"fmt"
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"time"
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"github.com/pkg/errors"
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certsapi "k8s.io/api/certificates/v1beta1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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clientset "k8s.io/client-go/kubernetes"
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certstype "k8s.io/client-go/kubernetes/typed/certificates/v1beta1"
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certutil "k8s.io/client-go/util/cert"
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csrutil "k8s.io/client-go/util/certificate/csr"
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pkiutil "k8s.io/kubernetes/cmd/kubeadm/app/util/pkiutil"
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)
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const certAPIPrefixName = "kubeadm-cert"
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var watchTimeout = 5 * time.Minute
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// APIRenewer define a certificate renewer implementation that uses the K8s certificate API
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type APIRenewer struct {
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client certstype.CertificatesV1beta1Interface
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}
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// NewAPIRenewer a new certificate renewer implementation that uses the K8s certificate API
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func NewAPIRenewer(client clientset.Interface) *APIRenewer {
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return &APIRenewer{
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client: client.CertificatesV1beta1(),
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}
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}
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// Renew a certificate using the K8s certificate API
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func (r *APIRenewer) Renew(cfg *certutil.Config) (*x509.Certificate, crypto.Signer, error) {
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reqTmp := &x509.CertificateRequest{
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Subject: pkix.Name{
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CommonName: cfg.CommonName,
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Organization: cfg.Organization,
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},
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DNSNames: cfg.AltNames.DNSNames,
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IPAddresses: cfg.AltNames.IPs,
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}
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key, err := pkiutil.NewPrivateKey()
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if err != nil {
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return nil, nil, errors.Wrap(err, "couldn't create new private key")
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}
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csr, err := certutil.MakeCSRFromTemplate(key, reqTmp)
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if err != nil {
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return nil, nil, errors.Wrap(err, "couldn't create certificate signing request")
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}
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usages := make([]certsapi.KeyUsage, len(cfg.Usages))
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for i, usage := range cfg.Usages {
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certsAPIUsage, ok := usageMap[usage]
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if !ok {
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return nil, nil, errors.Errorf("unknown key usage: %v", usage)
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}
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usages[i] = certsAPIUsage
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}
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k8sCSR := &certsapi.CertificateSigningRequest{
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ObjectMeta: metav1.ObjectMeta{
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GenerateName: fmt.Sprintf("%s-%s-", certAPIPrefixName, cfg.CommonName),
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},
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Spec: certsapi.CertificateSigningRequestSpec{
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Request: csr,
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Usages: usages,
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},
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}
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req, err := r.client.CertificateSigningRequests().Create(context.TODO(), k8sCSR)
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if err != nil {
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return nil, nil, errors.Wrap(err, "couldn't create certificate signing request")
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}
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fmt.Printf("[certs] Certificate request %q created\n", req.Name)
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ctx, cancel := context.WithTimeout(context.Background(), watchTimeout)
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defer cancel()
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certData, err := csrutil.WaitForCertificate(ctx, r.client.CertificateSigningRequests(), req)
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if err != nil {
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return nil, nil, errors.Wrap(err, "certificate failed to appear")
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}
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cert, err := certutil.ParseCertsPEM(certData)
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if err != nil {
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return nil, nil, errors.Wrap(err, "couldn't parse issued certificate")
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}
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if len(cert) != 1 {
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return nil, nil, errors.Errorf("certificate request %q has %d certificates, wanted exactly 1", req.Name, len(cert))
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}
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return cert[0], key, nil
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}
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var usageMap = map[x509.ExtKeyUsage]certsapi.KeyUsage{
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x509.ExtKeyUsageAny: certsapi.UsageAny,
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x509.ExtKeyUsageServerAuth: certsapi.UsageServerAuth,
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x509.ExtKeyUsageClientAuth: certsapi.UsageClientAuth,
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x509.ExtKeyUsageCodeSigning: certsapi.UsageCodeSigning,
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x509.ExtKeyUsageEmailProtection: certsapi.UsageEmailProtection,
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x509.ExtKeyUsageIPSECEndSystem: certsapi.UsageIPsecEndSystem,
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x509.ExtKeyUsageIPSECTunnel: certsapi.UsageIPsecTunnel,
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x509.ExtKeyUsageIPSECUser: certsapi.UsageIPsecUser,
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x509.ExtKeyUsageTimeStamping: certsapi.UsageTimestamping,
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x509.ExtKeyUsageOCSPSigning: certsapi.UsageOCSPSigning,
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x509.ExtKeyUsageMicrosoftServerGatedCrypto: certsapi.UsageMicrosoftSGC,
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x509.ExtKeyUsageNetscapeServerGatedCrypto: certsapi.UsageNetscapeSGC,
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}
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