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tls.go
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tls.go
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// Copyright 2018 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"crypto/tls"
"crypto/x509"
"io/ioutil"
"github.com/juju/errors"
)
// Security contains tls flags.
type Security struct {
ClusterSSLCA string
ClusterSSLCert string
ClusterSSLKey string
}
// ToTLSConfig generates tls's config based on tls flags.
func (s *Security) ToTLSConfig() (*tls.Config, error) {
var tlsConfig *tls.Config
if len(s.ClusterSSLCA) != 0 {
var certificates = make([]tls.Certificate, 0)
if len(s.ClusterSSLCert) != 0 && len(s.ClusterSSLKey) != 0 {
// Load the client certificates from disk
certificate, err := tls.LoadX509KeyPair(s.ClusterSSLCert, s.ClusterSSLKey)
if err != nil {
return nil, errors.Errorf("could not load client key pair: %s", err)
}
certificates = append(certificates, certificate)
}
// Create a certificate pool from the certificate authority
certPool := x509.NewCertPool()
ca, err := ioutil.ReadFile(s.ClusterSSLCA)
if err != nil {
return nil, errors.Errorf("could not read ca certificate: %s", err)
}
// Append the certificates from the CA
if !certPool.AppendCertsFromPEM(ca) {
return nil, errors.New("failed to append ca certs")
}
tlsConfig = &tls.Config{
Certificates: certificates,
RootCAs: certPool,
}
}
return tlsConfig, nil
}