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pemtokeystore.go
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pemtokeystore.go
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// Copyright 2016 Red Hat, Inc.
//
// 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 pemtokeystore
import (
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
keystore "github.com/pavel-v-chernykh/keystore-go"
)
const (
DefaultKeystorePassword = "changeit"
)
type Options struct {
PrivateKeyFiles map[string]string
CertFiles map[string]string
CACertFiles []string
CACertDirs []string
KeystorePath string
KeystorePassword string
SourceKeystorePath string
SourceKeystorePassword string
}
func CreateKeystore(opts Options) error {
if len(opts.KeystorePath) == 0 {
return fmt.Errorf("Missing keystore path")
}
keystorePassword := []byte(opts.KeystorePassword)
if len(keystorePassword) == 0 {
keystorePassword = []byte(DefaultKeystorePassword)
}
var ks keystore.KeyStore
if len(opts.SourceKeystorePath) > 0 {
sourceKeystorePassword := []byte(opts.SourceKeystorePassword)
if len(keystorePassword) == 0 {
sourceKeystorePassword = []byte(DefaultKeystorePassword)
}
sourceKs, err := readKeyStore(opts.SourceKeystorePath, sourceKeystorePassword)
if err != nil {
return err
}
ks = sourceKs
} else {
sourceKs, err := readKeyStore(opts.KeystorePath, keystorePassword)
if err != nil && !os.IsNotExist(err) {
return err
}
ks = sourceKs
}
for _, caFile := range opts.CACertFiles {
caCerts, err := readCACertsFromFile(caFile)
if err != nil {
return err
}
for alias, cert := range caCerts {
ks[alias] = &keystore.TrustedCertificateEntry{
Entry: keystore.Entry{CreationDate: time.Now()},
Certificate: cert,
}
}
}
for _, caDir := range opts.CACertDirs {
files, err := ioutil.ReadDir(caDir)
if err != nil {
return err
}
for _, file := range files {
if file.IsDir() {
continue
}
caCerts, err := readCACertsFromFile(filepath.Join(caDir, file.Name()))
if err != nil {
continue
}
for alias, cert := range caCerts {
ks[alias] = &keystore.TrustedCertificateEntry{
Entry: keystore.Entry{CreationDate: time.Now()},
Certificate: cert,
}
}
}
}
for alias, file := range opts.PrivateKeyFiles {
priv, err := privateKeyFromFile(file, keystorePassword)
if err != nil {
return err
}
certs, err := certsFromFile(opts.CertFiles[alias])
if err != nil {
return err
}
ks[alias] = &keystore.PrivateKeyEntry{
Entry: keystore.Entry{CreationDate: time.Now()},
PrivKey: priv,
CertChain: certs,
}
}
return writeKeyStore(ks, opts.KeystorePath, keystorePassword)
}
func readCACertsFromFile(caFile string) (map[string]keystore.Certificate, error) {
certs, err := certsFromFile(caFile)
if err != nil {
return nil, err
}
aliasCertMap := map[string]keystore.Certificate{}
for _, cert := range certs {
parsed, err := x509.ParseCertificates(cert.Content)
if err != nil {
return nil, err
}
if len(parsed) < 1 {
return nil, fmt.Errorf("could not decode CA certificate")
}
for _, ca := range parsed {
cn := ca.Subject.CommonName
if len(cn) == 0 {
return nil, fmt.Errorf("missing cn in CA certificate subject: %v", ca.Subject)
}
alias := strings.Replace(strings.ToLower(cn), " ", "", -1)
aliasCertMap[alias] = cert
}
}
return aliasCertMap, nil
}
func privateKeyFromFile(file string, password []byte) ([]byte, error) {
pkbs, err := pemFileToBlocks(file)
if err != nil {
return nil, err
}
if len(pkbs) != 1 {
return nil, fmt.Errorf("failed to single PEM block from file %s", file)
}
var pk interface{}
pkb := pkbs[0]
switch pkb.Type {
case "RSA PRIVATE KEY":
pk, err = x509.ParsePKCS1PrivateKey(pkb.Bytes)
case "EC PRIVATE KEY":
pk, err = x509.ParseECPrivateKey(pkb.Bytes)
default:
return nil, fmt.Errorf("unsupported private key type: %s", pkb.Type)
}
if err != nil {
return nil, err
}
return convertPrivateKeyToPKCS8(pk)
}
func certsFromFile(file string) ([]keystore.Certificate, error) {
if len(file) == 0 {
return nil, nil
}
cbs, err := pemFileToBlocks(file)
if err != nil {
return nil, err
}
var certs []keystore.Certificate
for _, cb := range cbs {
certs = append(certs, keystore.Certificate{
Type: "X509",
Content: cb.Bytes,
})
}
return certs, nil
}
func pemFileToBlocks(path string) ([]*pem.Block, error) {
raw, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
var (
pemBlocks []*pem.Block
current *pem.Block
)
for {
current, raw = pem.Decode(raw)
if current == nil {
if len(pemBlocks) > 0 {
return pemBlocks, nil
}
return nil, fmt.Errorf("failed to decode any PEM blocks from %s", path)
}
pemBlocks = append(pemBlocks, current)
if len(raw) == 0 {
break
}
}
return pemBlocks, nil
}
func writeKeyStore(ks keystore.KeyStore, path string, passphrase []byte) error {
// Let's do this atomically (temp + rename) in case anything is watching (inotify?) on
// the keystore itself.
absPath, err := filepath.Abs(path)
if err != nil {
return err
}
dir, filename := filepath.Split(absPath)
tempFile, err := ioutil.TempFile(dir, "."+filename)
if err != nil {
return err
}
err = keystore.Encode(tempFile, ks, passphrase)
tempFile.Close()
if err != nil {
return err
}
err = os.Rename(tempFile.Name(), absPath)
if err != nil {
os.Remove(tempFile.Name())
}
return err
}
func readKeyStore(filename string, password []byte) (keystore.KeyStore, error) {
f, err := os.Open(filename)
defer f.Close()
if err != nil {
return keystore.KeyStore{}, err
}
keyStore, err := keystore.Decode(f, password)
if err != nil {
return keystore.KeyStore{}, err
}
return keyStore, nil
}