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kube-arangodb/pkg/api/tls.go
2022-08-15 10:23:25 +02:00

91 lines
2.8 KiB
Go

//
// DISCLAIMER
//
// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
//
// 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.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package api
import (
"context"
"crypto/tls"
"time"
core "k8s.io/api/core/v1"
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
typedCore "k8s.io/client-go/kubernetes/typed/core/v1"
"github.com/arangodb-helper/go-certificates"
"github.com/arangodb/kube-arangodb/pkg/util/errors"
)
func prepareTLSConfig(cli typedCore.CoreV1Interface, cfg ServerConfig) (*tls.Config, error) {
cert, key, err := loadOrSelfSignCertificate(cli, cfg)
if err != nil {
return nil, errors.WithStack(err)
}
tlsConfig, err := createTLSConfig(cert, key)
if err != nil {
return nil, errors.WithStack(err)
}
tlsConfig.BuildNameToCertificate()
return tlsConfig, nil
}
// loadOrSelfSignCertificate loads TLS certificate from secret or creates a new one
func loadOrSelfSignCertificate(cli typedCore.CoreV1Interface, cfg ServerConfig) (string, string, error) {
if cfg.TLSSecretName != "" {
// Load TLS certificate from secret
s, err := cli.Secrets(cfg.Namespace).Get(context.Background(), cfg.TLSSecretName, meta.GetOptions{})
if err != nil {
return "", "", err
}
certBytes, found := s.Data[core.TLSCertKey]
if !found {
return "", "", errors.Newf("No %s found in secret %s", core.TLSCertKey, cfg.TLSSecretName)
}
keyBytes, found := s.Data[core.TLSPrivateKeyKey]
if !found {
return "", "", errors.Newf("No %s found in secret %s", core.TLSPrivateKeyKey, cfg.TLSSecretName)
}
return string(certBytes), string(keyBytes), nil
}
// Secret not specified, create our own TLS certificate
options := certificates.CreateCertificateOptions{
CommonName: cfg.ServerName,
Hosts: append([]string{cfg.ServerName}, cfg.ServerAltNames...),
ValidFrom: time.Now(),
ValidFor: time.Hour * 24 * 365 * 10,
IsCA: false,
ECDSACurve: "P256",
}
return certificates.CreateCertificate(options, nil)
}
// createTLSConfig creates a TLS config based on given config
func createTLSConfig(cert, key string) (*tls.Config, error) {
var result *tls.Config
c, err := tls.X509KeyPair([]byte(cert), []byte(key))
if err != nil {
return nil, errors.WithStack(err)
}
result = &tls.Config{
Certificates: []tls.Certificate{c},
}
return result, nil
}