mirror of https://github.com/kubernetes/kops.git
102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
/*
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Copyright 2023 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 bootstrap
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import (
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cryptorand "crypto/rand"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"fmt"
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"math/big"
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"time"
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"k8s.io/klog/v2"
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"k8s.io/kops/pkg/pki"
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)
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func randomBytes(length int) []byte {
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b := make([]byte, length)
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if _, err := cryptorand.Read(b); err != nil {
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klog.Fatalf("failed to read from crypto/rand: %v", err)
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}
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return b
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}
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func challengeKopsControllerSubject(clusterName string) pkix.Name {
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// Note: keep in sync with subjectsMatch if you add (additional) fields here
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return pkix.Name{
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CommonName: "kops-controller." + clusterName,
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}
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}
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func subjectsMatch(l, r pkix.Name) bool {
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// We need to check all the fields in challengeKopsControllerSubject
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return l.CommonName == r.CommonName
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}
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func challengeServerHostName(clusterName string) string {
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return "challenge-server." + clusterName
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}
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func BuildChallengeServerCertificate(clusterName string) (*tls.Certificate, error) {
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serverName := challengeServerHostName(clusterName)
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privateKey, err := pki.GeneratePrivateKey()
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if err != nil {
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return nil, fmt.Errorf("generating ecdsa key: %w", err)
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}
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keyUsage := x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
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now := time.Now()
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notBefore := now.Add(-15 * time.Minute)
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notAfter := notBefore.Add(time.Hour)
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template := x509.Certificate{
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SerialNumber: big.NewInt(1),
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Subject: pkix.Name{
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CommonName: serverName,
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: keyUsage,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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template.DNSNames = append(template.DNSNames, serverName)
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der, err := x509.CreateCertificate(cryptorand.Reader, &template, &template, privateKey.Key.Public(), privateKey.Key)
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if err != nil {
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return nil, fmt.Errorf("failed to create certificate: %w", err)
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}
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parsed, err := x509.ParseCertificate(der)
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if err != nil {
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return nil, fmt.Errorf("failed to parse certificate: %w", err)
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}
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tlsCertificate := &tls.Certificate{
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PrivateKey: privateKey.Key,
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Certificate: [][]byte{parsed.Raw},
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Leaf: parsed,
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}
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return tlsCertificate, nil
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}
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