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helpers.go
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helpers.go
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// Copyright (C) 2022 ScyllaDB
package crypto
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"strings"
"time"
"k8s.io/klog/v2"
)
func SignCertificate(template *x509.Certificate, requestKey *rsa.PublicKey, issuer *x509.Certificate, issuerKey *rsa.PrivateKey) (*x509.Certificate, error) {
if len(template.Subject.CommonName) == 0 && len(template.IPAddresses) == 0 && len(strings.Join(template.DNSNames, "")) == 0 {
return nil, fmt.Errorf("certificate requires either CommonName, IPAddresses or DNSNames to be set")
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, issuer, requestKey, issuerKey)
if err != nil {
return nil, fmt.Errorf("can't create certificate: %w", err)
}
certs, err := x509.ParseCertificates(derBytes)
if err != nil {
return nil, fmt.Errorf("can't parse der encoded certificate: %w", err)
}
if len(certs) != 1 {
return nil, fmt.Errorf("expected to parse 1 certificate from der bytes but %d were present", len(certs))
}
return certs[0], nil
}
func EncodeCertificates(certificates ...*x509.Certificate) ([]byte, error) {
buffer := bytes.Buffer{}
for _, certificate := range certificates {
err := pem.Encode(&buffer, &pem.Block{
Type: "CERTIFICATE",
Bytes: certificate.Raw,
})
if err != nil {
return nil, fmt.Errorf("can't pem encode certificate: %w", err)
}
}
return buffer.Bytes(), nil
}
func EncodePrivateKey(key *rsa.PrivateKey) ([]byte, error) {
buffer := bytes.Buffer{}
err := pem.Encode(&buffer, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
})
if err != nil {
return nil, fmt.Errorf("can't pem encode rsa private key: %w", err)
}
return buffer.Bytes(), nil
}
func DecodeCertificates(certBytes []byte) ([]*x509.Certificate, error) {
var certificates []*x509.Certificate
remainingBytes := certBytes
for len(remainingBytes) > 0 {
var block *pem.Block
block, remainingBytes = pem.Decode(remainingBytes)
if block == nil {
break
}
certificate, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, fmt.Errorf("can't parse certificate from block type %q: %w", block.Type, err)
}
certificates = append(certificates, certificate)
}
return certificates, nil
}
func DecodePrivateKey(keyBytes []byte) (*rsa.PrivateKey, error) {
block, remainingBytes := pem.Decode(keyBytes)
if block == nil {
return nil, fmt.Errorf("no private key block found")
}
privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("can't parse private key from block type %q: %w", block.Type, err)
}
var unexpectedBlockTypes []string
for len(remainingBytes) != 0 {
block, remainingBytes = pem.Decode(keyBytes)
if block == nil {
break
}
unexpectedBlockTypes = append(unexpectedBlockTypes, block.Type)
}
if len(unexpectedBlockTypes) > 0 {
klog.ErrorS(
errors.New("encountered unexpected blocks"),
"Private key was followed by unexpected blocks",
"UnexpectedBlockTypes", unexpectedBlockTypes,
)
}
return privateKey, nil
}
func GetTLSCertificatesFromBytes(certBytes, keyBytes []byte) ([]*x509.Certificate, *rsa.PrivateKey, error) {
certificates, err := DecodeCertificates(certBytes)
if err != nil {
return nil, nil, err
}
privateKey, err := DecodePrivateKey(keyBytes)
if err != nil {
return nil, nil, err
}
return certificates, privateKey, nil
}
func FilterOutExpiredCertificates(certs []*x509.Certificate, now time.Time) []*x509.Certificate {
var res []*x509.Certificate
for _, cert := range certs {
if cert.NotAfter.After(now) {
res = append(res, cert)
}
}
return res
}
func HasCertificate(certs []*x509.Certificate, cert *x509.Certificate) bool {
for _, c := range certs {
if cert.Equal(c) {
return true
}
}
return false
}
func FilterOutDuplicateCertificates(certs []*x509.Certificate) []*x509.Certificate {
var res []*x509.Certificate
for _, cert := range certs {
if HasCertificate(res, cert) {
continue
}
res = append(res, cert)
}
return res
}