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loader.go
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loader.go
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// Copyright 2016, Cong Ding. All rights reserved.
//
// 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.
//
// Author: Cong Ding <dinggnu@gmail.com>
package certs
import (
"crypto/tls"
"crypto/x509"
"errors"
"io/ioutil"
)
// LoadCACerts loads the CA certificates (root certs).
func LoadCACerts(certsFilename string) (*x509.CertPool, error) {
certs, err := ioutil.ReadFile(certsFilename)
if err != nil {
return nil, err
}
cp := x509.NewCertPool()
if ok := cp.AppendCertsFromPEM([]byte(certs)); !ok {
return nil, errors.New("fail loading certificates")
}
return cp, nil
}
// LoadClientCerts loads the client certificates.
func LoadClientCerts(rootCert, clientCert, clientKey, serverName string) (*tls.Config, error) {
// Load root certificate
roots, err := LoadCACerts(rootCert)
if err != nil {
return nil, err
}
// Load client certificate
cert, err := tls.LoadX509KeyPair(clientCert, clientKey)
if err != nil {
return nil, err
}
// Set TLS config
config := &tls.Config{
RootCAs: roots,
ServerName: serverName,
Certificates: []tls.Certificate{cert},
}
return config, nil
}
// LoadServerCerts loads the server certificates.
func LoadServerCerts(rootCert, serverCert, serverKey string) (*tls.Config, error) {
// Load root certificate
roots, err := LoadCACerts(rootCert)
if err != nil {
return nil, err
}
// Load server certificate
cert, err := tls.LoadX509KeyPair(serverCert, serverKey)
if err != nil {
return nil, err
}
// Set TLS config
config := &tls.Config{
ClientCAs: roots,
ClientAuth: tls.RequireAndVerifyClientCert,
Certificates: []tls.Certificate{cert},
}
return config, nil
}