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pki.go
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pki.go
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package pki
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"errors"
"fmt"
"math/big"
"time"
corev1 "k8s.io/api/core/v1"
)
var (
tlsCert = "tls.crt"
tlsKey = "tls.key"
defaultCAValidityDuration = 4 * 365 * 24 * time.Hour
defaultCertValidityDuration = 365 * 24 * time.Hour
)
type KeyPair struct {
Cert *x509.Certificate
Key *rsa.PrivateKey
CertPEM []byte
KeyPEM []byte
}
func (k *KeyPair) IsValid() bool {
return k.Cert != nil && k.Key != nil && len(k.CertPEM) > 0 && len(k.KeyPEM) > 0
}
func (k *KeyPair) FillTLSSecret(secret *corev1.Secret) {
if secret.Data == nil {
secret.Data = make(map[string][]byte)
}
secret.Data[tlsCert] = k.CertPEM
secret.Data[tlsKey] = k.KeyPEM
}
func KeyPairFromTLSSecret(secret *corev1.Secret) (*KeyPair, error) {
if secret.Data == nil {
return nil, errors.New("TLS Secret is empty")
}
certPEM := secret.Data[tlsCert]
keyPEM := secret.Data[tlsKey]
return KeyPairFromPEM(certPEM, keyPEM)
}
func KeyPairFromPEM(certPEM, keyPEM []byte) (*KeyPair, error) {
if len(certPEM) == 0 || len(keyPEM) == 0 {
return nil, errors.New("TLS Secret is empty")
}
pemBlockCert, _ := pem.Decode(certPEM)
if pemBlockCert == nil {
return nil, errors.New("Bad certificate")
}
cert, err := x509.ParseCertificate(pemBlockCert.Bytes)
if err != nil {
return nil, fmt.Errorf("Error parsing x509 certificate: %v", err)
}
pemBlockKey, _ := pem.Decode(keyPEM)
if pemBlockKey == nil {
return nil, fmt.Errorf("Bad private key")
}
key, err := x509.ParsePKCS1PrivateKey(pemBlockKey.Bytes)
if err != nil {
return nil, fmt.Errorf("Error parsing PKCS1 private key: %v", err)
}
return &KeyPair{
Cert: cert,
Key: key,
CertPEM: certPEM,
KeyPEM: keyPEM,
}, nil
}
type X509Opts struct {
CommonName string
DNSNames []string
Organization string
NotBefore time.Time
NotAfter time.Time
}
type X509Opt func(*X509Opts)
func WithCommonName(name string) X509Opt {
return func(x *X509Opts) {
x.CommonName = name
}
}
func WithDNSNames(dnsNames []string) X509Opt {
return func(x *X509Opts) {
x.DNSNames = dnsNames
}
}
func WithOrganization(org string) X509Opt {
return func(x *X509Opts) {
x.Organization = org
}
}
func WithNotBefore(notBefore time.Time) X509Opt {
return func(x *X509Opts) {
x.NotBefore = notBefore
}
}
func WithNotAfter(notAfter time.Time) X509Opt {
return func(x *X509Opts) {
x.NotAfter = notAfter
}
}
func CreateCA(x509Opts ...X509Opt) (*KeyPair, error) {
opts := X509Opts{
CommonName: "mariadb-operator",
Organization: "mariadb-operator",
NotBefore: time.Now().Add(-1 * time.Hour),
NotAfter: time.Now().Add(defaultCAValidityDuration),
}
for _, setOpt := range x509Opts {
setOpt(&opts)
}
tpl := &x509.Certificate{
SerialNumber: big.NewInt(0),
Subject: pkix.Name{
CommonName: opts.CommonName,
Organization: []string{opts.Organization},
},
DNSNames: []string{
opts.CommonName,
},
NotBefore: opts.NotBefore,
NotAfter: opts.NotAfter,
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
IsCA: true,
}
return createKeyPair(tpl, nil)
}
func CreateCert(caKeyPair *KeyPair, x509Opts ...X509Opt) (*KeyPair, error) {
opts := X509Opts{
NotBefore: time.Now().Add(-1 * time.Hour),
NotAfter: time.Now().Add(defaultCertValidityDuration),
}
for _, setOpt := range x509Opts {
setOpt(&opts)
}
if opts.CommonName == "" || opts.DNSNames == nil {
return nil, errors.New("CommonName and DNSNames are mandatory")
}
tpl := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: opts.CommonName,
},
DNSNames: opts.DNSNames,
NotBefore: opts.NotBefore,
NotAfter: opts.NotAfter,
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
return createKeyPair(tpl, caKeyPair)
}
func ParseCert(bytes []byte) (*x509.Certificate, error) {
pemBlockCert, _ := pem.Decode(bytes)
if pemBlockCert == nil {
return nil, errors.New("Error parsing PEM block")
}
parsedCert, err := x509.ParseCertificate(pemBlockCert.Bytes)
if err != nil {
return nil, err
}
return parsedCert, nil
}
func ValidCert(caCert *x509.Certificate, certKeyPair *KeyPair, dnsName string, at time.Time) (bool, error) {
if !certKeyPair.IsValid() {
return false, errors.New("Invalid certificate KeyPair")
}
_, err := tls.X509KeyPair(certKeyPair.CertPEM, certKeyPair.KeyPEM)
if err != nil {
return false, err
}
parsedCert, err := ParseCert(certKeyPair.CertPEM)
if err != nil {
return false, err
}
pool := x509.NewCertPool()
pool.AddCert(caCert)
_, err = parsedCert.Verify(x509.VerifyOptions{
DNSName: dnsName,
Roots: pool,
CurrentTime: at,
})
if err != nil {
return false, err
}
return true, nil
}
func ValidCACert(keyPair *KeyPair, dnsName string, at time.Time) (bool, error) {
return ValidCert(keyPair.Cert, keyPair, dnsName, at)
}
func createKeyPair(tpl *x509.Certificate, caKeyPair *KeyPair) (*KeyPair, error) {
key, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
parent := tpl
privateKey := key
if caKeyPair != nil {
parent = caKeyPair.Cert
privateKey = caKeyPair.Key
}
certBytes, err := x509.CreateCertificate(rand.Reader, tpl, parent, key.Public(), privateKey)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(certBytes)
if err != nil {
return nil, err
}
certPEM, keyPEM, err := pemEncodeKeyPair(certBytes, key)
if err != nil {
return nil, err
}
return &KeyPair{
Cert: cert,
Key: key,
CertPEM: certPEM,
KeyPEM: keyPEM,
}, nil
}
func pemEncodeKeyPair(certificateDER []byte, key *rsa.PrivateKey) (certPEM []byte, keyPEM []byte, err error) {
certBuf := &bytes.Buffer{}
if err := pem.Encode(certBuf, &pem.Block{Type: "CERTIFICATE", Bytes: certificateDER}); err != nil {
return nil, nil, err
}
keyBuf := &bytes.Buffer{}
if err := pem.Encode(keyBuf, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}); err != nil {
return nil, nil, err
}
return certBuf.Bytes(), keyBuf.Bytes(), nil
}