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maketlscert.go
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maketlscert.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package maketlscert
import (
"bytes"
"context"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"time"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/tasks"
"namespacelabs.dev/foundation/std/types"
)
func CreateSelfSignedCertificateChain(ctx context.Context, env *schema.Environment, r *types.TLSCertificateSpec) (*types.CertificateChain, error) {
return tasks.Return(ctx, tasks.Action("certificate.create-bundle").Arg("key_size", keySize(env)), func(ctx context.Context) (*types.CertificateChain, error) {
return createCertificateChain(env, r)
})
}
func createCertificateChain(env *schema.Environment, r *types.TLSCertificateSpec) (*types.CertificateChain, error) {
notBefore := time.Date(2022, time.January, 1, 0, 0, 0, 0, time.UTC)
notAfter := time.Date(2031, time.December, 31, 23, 59, 59, 59, time.UTC)
caSerial, err := newSerialNumber()
if err != nil {
return nil, err
}
serverSerial, err := newSerialNumber()
if err != nil {
return nil, err
}
cacert := &x509.Certificate{
SerialNumber: caSerial,
Subject: pkix.Name{
Organization: r.Organization,
CommonName: r.Description + ", self-signed CA",
},
NotBefore: notBefore,
NotAfter: notAfter,
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
caPrivKey, err := rsa.GenerateKey(rand.Reader, keySize(env))
if err != nil {
return nil, err
}
caBundle, err := x509.CreateCertificate(rand.Reader, cacert, cacert, &caPrivKey.PublicKey, caPrivKey)
if err != nil {
return nil, err
}
ca, err := pemEncode(caBundle, caPrivKey)
if err != nil {
return nil, err
}
cert := &x509.Certificate{
SerialNumber: serverSerial,
Subject: pkix.Name{
Organization: r.Organization,
CommonName: r.CommonName,
},
DNSNames: r.DnsName,
NotBefore: notBefore,
NotAfter: notAfter,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
certPrivKey, err := rsa.GenerateKey(rand.Reader, keySize(env))
if err != nil {
return nil, err
}
certBytes, err := x509.CreateCertificate(rand.Reader, cert, cacert, &certPrivKey.PublicKey, caPrivKey)
if err != nil {
return nil, err
}
server, err := pemEncode(certBytes, certPrivKey)
if err != nil {
return nil, err
}
return &types.CertificateChain{CA: ca, Server: server}, nil
}
func pemEncode(bundle []byte, privKey *rsa.PrivateKey) (*schema.Certificate, error) {
// pem encode
var caPEM bytes.Buffer
if err := pem.Encode(&caPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: bundle,
}); err != nil {
return nil, err
}
var caPrivKeyPEM bytes.Buffer
if err := pem.Encode(&caPrivKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(privKey),
}); err != nil {
return nil, err
}
return &schema.Certificate{PrivateKey: caPrivKeyPEM.Bytes(), CertificateBundle: caPEM.Bytes(), PrivateCa: true}, nil
}
func newSerialNumber() (*big.Int, error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
return rand.Int(rand.Reader, serialNumberLimit)
}
func keySize(env *schema.Environment) int {
if env.Purpose == schema.Environment_TESTING {
// Speed up tests with cheaper keys.
return 512
}
if env.Purpose == schema.Environment_PRODUCTION {
return 4096
}
return 2048
}