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/*
* Copyright 2018 Intel Corporation, 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 auth
import (
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"io/ioutil"
"log"
pkgerrors "github.com/pkg/errors"
)
// GetTLSConfig initializes a tlsConfig using the CA's certificate
// This config is then used to enable the server for mutual TLS
func GetTLSConfig(caCertFile string, certFile string, keyFile string) (*tls.Config, error) {
// Initialize tlsConfig once
caCert, err := ioutil.ReadFile(caCertFile)
if err != nil {
return nil, pkgerrors.Wrap(err, "Read CA Cert file")
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig := &tls.Config{
// Change to RequireAndVerify once we have mandatory certs
ClientAuth: tls.VerifyClientCertIfGiven,
ClientCAs: caCertPool,
MinVersion: tls.VersionTLS12,
}
certPEMBlk, err := readPEMBlock(certFile)
if err != nil {
return nil, pkgerrors.Wrap(err, "Read Cert File")
}
keyPEMBlk, err := readPEMBlock(keyFile)
if err != nil {
return nil, pkgerrors.Wrap(err, "Read Key File")
}
tlsConfig.Certificates = make([]tls.Certificate, 1)
tlsConfig.Certificates[0], err = tls.X509KeyPair(certPEMBlk, keyPEMBlk)
if err != nil {
return nil, pkgerrors.Wrap(err, "Load x509 cert and key")
}
tlsConfig.BuildNameToCertificate()
return tlsConfig, nil
}
func readPEMBlock(filename string) ([]byte, error) {
pemData, err := ioutil.ReadFile(filename)
if err != nil {
return nil, pkgerrors.Wrap(err, "Read PEM File")
}
pemBlock, rest := pem.Decode(pemData)
if len(rest) > 0 {
log.Println("Pemfile has extra data")
}
if x509.IsEncryptedPEMBlock(pemBlock) {
password, err := ioutil.ReadFile(filename + ".pass")
if err != nil {
return nil, pkgerrors.Wrap(err, "Read Password File")
}
pByte, err := base64.StdEncoding.DecodeString(string(password))
if err != nil {
return nil, pkgerrors.Wrap(err, "Decode PEM Password")
}
pemData, err = x509.DecryptPEMBlock(pemBlock, pByte)
if err != nil {
return nil, pkgerrors.Wrap(err, "Decrypt PEM Data")
}
var newPEMBlock pem.Block
newPEMBlock.Type = pemBlock.Type
newPEMBlock.Bytes = pemData
// Converting back to PEM from DER data you get from
// DecryptPEMBlock
pemData = pem.EncodeToMemory(&newPEMBlock)
}
return pemData, nil
}
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