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certutil.go
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certutil.go
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// Copyright © 2019 Banzai Cloud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cert
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
mathrand "math/rand"
"strings"
"time"
"emperror.dev/errors"
jks "github.com/pavlo-v-chernykh/keystore-go/v4"
corev1 "k8s.io/api/core/v1"
"github.com/banzaicloud/koperator/api/v1alpha1"
)
const (
RSAPrivateKeyType = "RSA PRIVATE KEY"
PrivateKeyType = "PRIVATE KEY"
ECPrivateKeyType = "EC PRIVATE KEY"
CertRequestType = "CERTIFICATE REQUEST"
)
type CertificateContainer struct {
// Certificate
Certificate *x509.Certificate
// PEM holds the certificate in PEM format
PEM *pem.Block
}
func (c CertificateContainer) ToPEM() []byte {
return pem.EncodeToMemory(c.PEM)
}
func GetCertBundle(certContainers []*CertificateContainer) []*x509.Certificate {
certs := make([]*x509.Certificate, 0, len(certContainers))
for _, certContainer := range certContainers {
certs = append(certs, certContainer.Certificate)
}
return certs
}
func ParseCertificates(data []byte) ([]*CertificateContainer, error) {
ok := false
certs := make([]*CertificateContainer, 0)
for len(data) > 0 {
var certBlock *pem.Block
certBlock, data = pem.Decode(data)
if certBlock == nil {
return certs, fmt.Errorf("malformed PEM data found")
}
if certBlock.Type != "CERTIFICATE" {
continue
}
cert, err := x509.ParseCertificate(certBlock.Bytes)
if err != nil {
return nil, err
}
certs = append(certs, &CertificateContainer{cert, certBlock})
ok = true
}
if !ok {
return certs, fmt.Errorf("no certificates found")
}
return certs, nil
}
// passChars are the characters used when generating passwords
var passChars []rune = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"abcdefghijklmnopqrstuvwxyz" +
"0123456789")
// DecodePrivateKeyBytes will decode a PEM encoded private key into a crypto.Signer.
// It supports ECDSA, PKCS1, PKCS8 private key format only. All other types will return err.
func DecodePrivateKeyBytes(keyBytes []byte) (key crypto.Signer, err error) {
block, _ := pem.Decode(keyBytes)
if block == nil {
return nil, errors.New("failed to decode PEM data")
}
switch block.Type {
case RSAPrivateKeyType:
key, err = x509.ParsePKCS1PrivateKey(block.Bytes)
case PrivateKeyType:
parsedKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
var ok bool
if key, ok = parsedKey.(crypto.Signer); !ok {
return nil, errors.New("error parsing pkcs8 private key")
}
case ECPrivateKeyType:
key, err = x509.ParseECPrivateKey(block.Bytes)
default:
return nil, fmt.Errorf("unknown private key type: %s", block.Type)
}
return
}
// DecodeCertificate returns an x509.Certificate for a PEM encoded certificate
func DecodeCertificate(raw []byte) (cert *x509.Certificate, err error) {
certs, err := ParseCertificates(raw)
if err != nil {
return nil, err
}
return certs[0].Certificate, nil
}
// GeneratePass generates a random password
func GeneratePass(length int) (passw []byte) {
mathrand.Seed(time.Now().UnixNano())
var b strings.Builder
for i := 0; i < length; i++ {
b.WriteRune(passChars[mathrand.Intn(len(passChars))])
}
passw = []byte(b.String())
return
}
// EnsureSecretPassJKS ensures a JKS password is present in a certificate secret
func EnsureSecretPassJKS(secret *corev1.Secret) (injected *corev1.Secret, err error) {
// If the JKS Pass is already present - return
if _, ok := secret.Data[v1alpha1.PasswordKey]; ok {
return secret, nil
}
injected = secret.DeepCopy()
injected.Data[v1alpha1.PasswordKey] = GeneratePass(16)
return
}
func GenerateJKSFromByte(certByte []byte, privateKey []byte, caCert []byte) (out, passw []byte, err error) {
c, err := DecodeCertificate(certByte)
if err != nil {
return
}
ca, err := DecodeCertificate(caCert)
if err != nil {
return
}
return GenerateJKS([]*x509.Certificate{ca, c}, privateKey)
}
// GenerateJKS creates a JKS with a random password from a client cert/key combination
func GenerateJKS(certs []*x509.Certificate, privateKey []byte) (out, passw []byte, err error) {
pKeyRaw, err := DecodePrivateKeyBytes(privateKey)
if err != nil {
return nil, nil, err
}
pKeyPKCS8, err := x509.MarshalPKCS8PrivateKey(pKeyRaw)
if err != nil {
return nil, nil, err
}
certCABundle := make([]jks.Certificate, 0, len(certs))
for _, cert := range certs {
kcert := jks.Certificate{
Type: "X.509",
Content: cert.Raw,
}
certCABundle = append(certCABundle, kcert)
}
jksKeyStore := jks.New()
pkeIn := jks.PrivateKeyEntry{
CreationTime: time.Now(),
PrivateKey: pKeyPKCS8,
CertificateChain: certCABundle,
}
//Add into trusted from our cert chain
for i, cert := range certs {
if cert.IsCA {
caIn := jks.TrustedCertificateEntry{
CreationTime: time.Now(),
Certificate: jks.Certificate{
Type: "X.509",
Content: cert.Raw,
},
}
alias := fmt.Sprintf("trusted_ca_%d", i)
if err = jksKeyStore.SetTrustedCertificateEntry(alias, caIn); err != nil {
return nil, nil, err
}
}
}
password := GeneratePass(16)
if err = jksKeyStore.SetPrivateKeyEntry("certs", pkeIn, password); err != nil {
return nil, nil, err
}
var outBuf bytes.Buffer
if err = jksKeyStore.Store(&outBuf, password); err != nil {
return nil, nil, err
}
return outBuf.Bytes(), password, err
}
// GenerateTestCert is used from unit tests for generating certificates
func GenerateTestCert() (cert, key []byte, expectedDn string, err error) {
priv, serialNumber, err := generatePrivateKey()
if err != nil {
return cert, key, expectedDn, err
}
template := x509.Certificate{
SerialNumber: serialNumber,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IsCA: true,
Subject: pkix.Name{
CommonName: "test-cn",
Organization: []string{"test-ou"},
},
}
cert, err = x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return cert, key, expectedDn, err
}
buf := new(bytes.Buffer)
if err = pem.Encode(buf, &pem.Block{Type: "CERTIFICATE", Bytes: cert}); err != nil {
return
}
cert = buf.Bytes()
key, err = encodePrivateKeyInPemFormat(priv)
if err != nil {
return cert, key, expectedDn, err
}
expectedDn = "CN=test-cn,O=test-ou"
return cert, key, expectedDn, err
}
func generatePrivateKey() (*rsa.PrivateKey, *big.Int, error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, serialNumber, err
}
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, serialNumber, err
}
return priv, serialNumber, err
}
func encodePrivateKeyInPemFormat(priv *rsa.PrivateKey) ([]byte, error) {
keyBuf := new(bytes.Buffer)
if err := pem.Encode(keyBuf, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
return nil, err
}
key := keyBuf.Bytes()
return key, nil
}
// GeneratePrivateKeyInPemFormat is used to generate a private key in a pem format
func GeneratePrivateKeyInPemFormat() ([]byte, error) {
priv, _, err := generatePrivateKey()
if err != nil {
return nil, err
}
return encodePrivateKeyInPemFormat(priv)
}
// GenerateSigningRequestInPemFormat is used to generate a signing request in a pem format
func GenerateSigningRequestInPemFormat(priv *rsa.PrivateKey, commonName string, dnsNames []string) ([]byte, error) {
template := x509.CertificateRequest{
SignatureAlgorithm: x509.SHA256WithRSA,
Subject: pkix.Name{
CommonName: commonName,
},
DNSNames: dnsNames,
}
csr, err := x509.CreateCertificateRequest(rand.Reader, &template, priv)
if err != nil {
return nil, err
}
buf := new(bytes.Buffer)
if err = pem.Encode(buf, &pem.Block{Type: CertRequestType, Bytes: csr}); err != nil {
return nil, err
}
signingReq := buf.Bytes()
return signingReq, err
}
func checkSSLCertInJKS(data map[string][]byte) error {
var err error
if len(data[v1alpha1.TLSJKSTrustStore]) == 0 {
err = errors.Combine(err, fmt.Errorf("%s entry is missing", v1alpha1.TLSJKSTrustStore))
}
if len(data[v1alpha1.TLSJKSKeyStore]) == 0 {
err = errors.Combine(err, fmt.Errorf("%s entry is missing", v1alpha1.TLSJKSKeyStore))
}
if len(data[v1alpha1.PasswordKey]) == 0 {
err = errors.Combine(err, fmt.Errorf("%s entry is missing", v1alpha1.PasswordKey))
}
if err != nil {
err = errors.WrapIff(err, "there is missing data entry for JKS format based certificates")
}
return err
}
func CheckSSLCertSecret(secret *corev1.Secret) error {
if err := checkSSLCertInJKS(secret.Data); err != nil {
return errors.WrapIfWithDetails(err, "couldn't get certificates from secret", "name", secret.GetName(), "namespace", secret.GetNamespace())
}
return nil
}
func ParseTrustStoreToCaChain(truststore, password []byte) ([]*x509.Certificate, error) {
jksTrustStore := jks.New()
err := jksTrustStore.Load(bytes.NewReader(truststore), password)
if err != nil {
return nil, err
}
var trustedEntries []jks.TrustedCertificateEntry
aliases := jksTrustStore.Aliases()
// collecting ca certificates in aliases so truststore can be alias agnostic
for _, alias := range aliases {
trustedEntry, err := jksTrustStore.GetTrustedCertificateEntry(alias)
if err != nil && !errors.Is(err, jks.ErrWrongEntryType) {
return nil, errors.WrapIf(err, "couldn't get trusted entry from truststore")
}
if err == nil {
trustedEntries = append(trustedEntries, trustedEntry)
}
}
if len(trustedEntries) == 0 {
return nil, errors.New("couldn't find trusted certificate entry in truststore")
}
var caCerts []*x509.Certificate
for _, trustedEntry := range trustedEntries {
caCert, err := x509.ParseCertificates(trustedEntry.Certificate.Content)
if err != nil {
return nil, errors.WrapIf(err, "couldn't parse trusted certificate entry")
}
caCerts = append(caCerts, caCert...)
}
return caCerts, nil
}
func ParseKeyStoreToTLSCertificate(keystore, password []byte) (tls.Certificate, error) {
jksKeyStore := jks.New()
err := jksKeyStore.Load(bytes.NewReader(keystore), password)
if err != nil {
return tls.Certificate{}, err
}
aliases := jksKeyStore.Aliases()
var privateEntries []jks.PrivateKeyEntry
// collecting pirvate key entries in aliases so keystore can be alias agnostic
for _, alias := range aliases {
privateEntry, err := jksKeyStore.GetPrivateKeyEntry(alias, password)
if err != nil && !errors.Is(err, jks.ErrWrongEntryType) {
return tls.Certificate{}, errors.WrapIf(err, "couldn't get private key entry from keystore")
}
if err == nil {
privateEntries = append(privateEntries, privateEntry)
}
}
// When there are more privateEntries then how can we know which one should be used
if len(privateEntries) > 1 {
return tls.Certificate{}, fmt.Errorf("keystore should contains only one private key entry, but got: %d", len(privateEntries))
} else if len(privateEntries) == 0 {
return tls.Certificate{}, errors.New("couldn't find private key entry in keystore")
}
parsedKey, err := x509.ParsePKCS8PrivateKey(privateEntries[0].PrivateKey)
if err != nil {
return tls.Certificate{}, err
}
privKey, ok := parsedKey.(crypto.Signer)
if !ok {
return tls.Certificate{}, errors.New("private key couldn't be recognized")
}
leaf, err := x509.ParseCertificates(privateEntries[0].CertificateChain[0].Content)
if err != nil {
return tls.Certificate{}, err
}
var certChain [][]byte
for _, cert := range privateEntries[0].CertificateChain {
certChain = append(certChain, cert.Content)
}
x509ClientCert := tls.Certificate{
Leaf: leaf[0],
PrivateKey: privKey,
Certificate: certChain,
}
return x509ClientCert, nil
}