92 lines
2.7 KiB
Go
92 lines
2.7 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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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 localkube
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import (
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"bytes"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"io/ioutil"
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"math/big"
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"net"
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"os"
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"path/filepath"
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"time"
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)
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// You may also specify additional subject alt names (either ip or dns names) for the certificate
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// The certificate will be created with file mode 0644. The key will be created with file mode 0600.
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// If the certificate or key files already exist, they will be overwritten.
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// Any parent directories of the certPath or keyPath will be created as needed with file mode 0755.
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func GenerateSelfSignedCert(certPath, keyPath string, ips []net.IP, alternateDNS []string) error {
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return err
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}
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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: "minikube",
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(time.Hour * 24 * 365),
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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BasicConstraintsValid: true,
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IsCA: true,
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}
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template.IPAddresses = append(template.IPAddresses, ips...)
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template.DNSNames = append(template.DNSNames, alternateDNS...)
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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return err
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}
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certBuffer := bytes.Buffer{}
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if err := pem.Encode(&certBuffer, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
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return err
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}
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keyBuffer := bytes.Buffer{}
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if err := pem.Encode(&keyBuffer, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
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return err
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}
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if err := os.MkdirAll(filepath.Dir(certPath), os.FileMode(0755)); err != nil {
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return err
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}
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if err := ioutil.WriteFile(certPath, certBuffer.Bytes(), os.FileMode(0644)); err != nil {
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return err
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}
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if err := os.MkdirAll(filepath.Dir(keyPath), os.FileMode(0755)); err != nil {
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return err
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}
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if err := ioutil.WriteFile(keyPath, keyBuffer.Bytes(), os.FileMode(0600)); err != nil {
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return err
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}
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return nil
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}
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