113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
/*
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Copyright 2021 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 main
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import (
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"bytes"
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cryptorand "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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"fmt"
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"math/big"
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"time"
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)
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// generate https certs for the webhook server
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func gencerts() (caCert []byte, serverCert []byte, serverKey []byte) {
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var caPEM, serverCertPEM, serverPrivKeyPEM *bytes.Buffer
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// CA config
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ca := &x509.Certificate{
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SerialNumber: big.NewInt(2020),
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Subject: pkix.Name{
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Organization: []string{"velotio.com"},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().AddDate(1, 0, 0),
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IsCA: true,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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BasicConstraintsValid: true,
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}
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// CA private key
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caPrivKey, err := rsa.GenerateKey(cryptorand.Reader, 4096)
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if err != nil {
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fmt.Println(err)
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}
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// Self signed CA certificate
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caBytes, err := x509.CreateCertificate(cryptorand.Reader, ca, ca, &caPrivKey.PublicKey, caPrivKey)
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if err != nil {
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fmt.Println(err)
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}
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// PEM encode CA cert
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caPEM = new(bytes.Buffer)
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_ = pem.Encode(caPEM, &pem.Block{
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Type: "CERTIFICATE",
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Bytes: caBytes,
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})
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dnsNames := []string{"webhook",
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"webhook.auto-pause", "webhook.auto-pause.svc"}
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commonName := "webhook.auto-pause.svc"
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// server cert config
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cert := &x509.Certificate{
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DNSNames: dnsNames,
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SerialNumber: big.NewInt(1658),
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Subject: pkix.Name{
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CommonName: commonName,
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Organization: []string{"velotio.com"},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().AddDate(1, 0, 0),
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SubjectKeyId: []byte{1, 2, 3, 4, 6},
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature,
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}
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// server private key
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serverPrivKey, err := rsa.GenerateKey(cryptorand.Reader, 4096)
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if err != nil {
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fmt.Println(err)
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}
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// sign the server cert
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serverCertBytes, err := x509.CreateCertificate(cryptorand.Reader, cert, ca, &serverPrivKey.PublicKey, caPrivKey)
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if err != nil {
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fmt.Println(err)
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}
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// PEM encode the server cert and key
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serverCertPEM = new(bytes.Buffer)
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_ = pem.Encode(serverCertPEM, &pem.Block{
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Type: "CERTIFICATE",
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Bytes: serverCertBytes,
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})
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serverPrivKeyPEM = new(bytes.Buffer)
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_ = pem.Encode(serverPrivKeyPEM, &pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(serverPrivKey),
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})
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return caPEM.Bytes(), serverCertPEM.Bytes(), serverPrivKeyPEM.Bytes()
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}
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