tls.go

// Copyright 2017 The etcd-operator Authors
//
// 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 etcdutil

import (
	"crypto/tls"
	"io/ioutil"
	"path/filepath"

	"github.com/coreos/etcd/pkg/transport"
)

const (
	CliCertFile = "etcd-client.crt"
	CliKeyFile  = "etcd-client.key"
	CliCAFile   = "etcd-client-ca.crt"
)

func NewTLSConfig(certData, keyData, caData []byte) (*tls.Config, error) {
	// TODO: Need cleanup these temp dirs
	dir, err := ioutil.TempDir("", "etcd-operator-cluster-tls")
	if err != nil {
		return nil, err
	}

	certFile, err := writeFile(dir, CliCertFile, certData)
	if err != nil {
		return nil, err
	}
	keyFile, err := writeFile(dir, CliKeyFile, keyData)
	if err != nil {
		return nil, err
	}
	caFile, err := writeFile(dir, CliCAFile, caData)
	if err != nil {
		return nil, err
	}

	tlsInfo := transport.TLSInfo{
		CertFile:      certFile,
		KeyFile:       keyFile,
		TrustedCAFile: caFile,
	}
	tlsConfig, err := tlsInfo.ClientConfig()
	if err != nil {
		return nil, err
	}
	return tlsConfig, nil
}

func writeFile(dir, file string, data []byte) (string, error) {
	p := filepath.Join(dir, file)
	return p, ioutil.WriteFile(p, data, 0600)
}