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package k8stlsutil
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"errors"
"math"
"math/big"
"net"
"time"
)
const (
RSAKeySize = 2048
Duration365d = time.Hour * 24 * 365
)
type CertConfig struct {
CommonName string
Organization []string
AltNames AltNames
}
// AltNames contains the domain names and IP addresses that will be added
// to the API Server's x509 certificate SubAltNames field. The values will
// be passed directly to the x509.Certificate object.
type AltNames struct {
DNSNames []string
IPs []net.IP
}
func NewPrivateKey() (*rsa.PrivateKey, error) {
return rsa.GenerateKey(rand.Reader, RSAKeySize)
}
func EncodePublicKeyPEM(key *rsa.PublicKey) ([]byte, error) {
der, err := x509.MarshalPKIXPublicKey(key)
if err != nil {
return []byte{}, err
}
block := pem.Block{
Type: "PUBLIC KEY",
Bytes: der,
}
return pem.EncodeToMemory(&block), nil
}
func EncodePrivateKeyPEM(key *rsa.PrivateKey) []byte {
block := pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
return pem.EncodeToMemory(&block)
}
func EncodeCertificatePEM(cert *x509.Certificate) []byte {
block := pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
}
return pem.EncodeToMemory(&block)
}
func NewSelfSignedCACertificate(cfg CertConfig, key *rsa.PrivateKey, validDuration time.Duration) (*x509.Certificate, error) {
now := time.Now()
dur := Duration365d * 10
if validDuration != 0 {
dur = validDuration
}
tmpl := x509.Certificate{
SerialNumber: new(big.Int).SetInt64(0),
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: cfg.Organization,
},
NotBefore: now,
NotAfter: now.Add(dur),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
IsCA: true,
}
certDERBytes, err := x509.CreateCertificate(rand.Reader, &tmpl, &tmpl, key.Public(), key)
if err != nil {
return nil, err
}
return x509.ParseCertificate(certDERBytes)
}
func ParsePEMEncodedCACert(pemdata []byte) (*x509.Certificate, error) {
decoded, _ := pem.Decode(pemdata)
if decoded == nil {
return nil, errors.New("no PEM data found")
}
return x509.ParseCertificate(decoded.Bytes)
}
func ParsePEMEncodedPrivateKey(pemdata []byte) (*rsa.PrivateKey, error) {
decoded, _ := pem.Decode(pemdata)
if decoded == nil {
return nil, errors.New("no PEM data found")
}
return x509.ParsePKCS1PrivateKey(decoded.Bytes)
}
func NewSignedCertificate(cfg CertConfig, key *rsa.PrivateKey, caCert *x509.Certificate, caKey *rsa.PrivateKey, validDuration time.Duration) (*x509.Certificate, error) {
serial, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
return nil, err
}
dur := Duration365d
if validDuration != 0 {
dur = validDuration
}
certTmpl := x509.Certificate{
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: caCert.Subject.Organization,
},
DNSNames: cfg.AltNames.DNSNames,
IPAddresses: cfg.AltNames.IPs,
SerialNumber: serial,
NotBefore: caCert.NotBefore,
NotAfter: time.Now().Add(dur),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
}
certDERBytes, err := x509.CreateCertificate(rand.Reader, &certTmpl, caCert, key.Public(), caKey)
if err != nil {
return nil, err
}
return x509.ParseCertificate(certDERBytes)
}
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