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config_tls.go
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config_tls.go
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// Copyright (C) 2020 Satoshi Konno. 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.
package postgresql
import (
"crypto/tls"
"crypto/x509"
"os"
)
// TLSConf represents a TLS configuration.
type TLSConf struct {
ClientAuthType tls.ClientAuthType
ServerCert []byte
ServerKey []byte
RootCerts [][]byte
enabled bool
tlsConfig *tls.Config
}
// NewTLSConf returns a new TLS configuration.
func NewTLSConf() *TLSConf {
return &TLSConf{
ClientAuthType: tls.RequireAndVerifyClientCert,
ServerCert: []byte{},
ServerKey: []byte{},
RootCerts: [][]byte{},
tlsConfig: nil,
enabled: false,
}
}
// SetTLSEnabled sets a TLS enabled flag.
func (config *TLSConf) SetTLSEnabled(enabled bool) {
config.enabled = enabled
}
// IsEnabled returns true if the TLS is enabled.
func (config *TLSConf) IsTLSEnabled() bool {
return config.enabled
}
// SetClientAuthType sets a client authentication type.
func (config *TLSConf) SetClientAuthType(authType tls.ClientAuthType) {
config.ClientAuthType = authType
config.tlsConfig = nil
config.SetTLSEnabled(true)
}
// SetServerKeyFile sets a SSL server key file.
func (config *TLSConf) SetServerKeyFile(file string) error {
key, err := os.ReadFile(file)
if err != nil {
return err
}
config.SetServerKey(key)
return nil
}
// SetServerCertFile sets a SSL server certificate file.
func (config *TLSConf) SetServerCertFile(file string) error {
cert, err := os.ReadFile(file)
if err != nil {
return err
}
config.SetServerCert(cert)
return nil
}
// SetRootCertFile sets a SSL root certificates.
func (config *TLSConf) SetRootCertFiles(files ...string) error {
certs := make([][]byte, len(files))
for n, file := range files {
cert, err := os.ReadFile(file)
if err != nil {
return err
}
certs[n] = cert
}
config.SetRootCerts(certs...)
return nil
}
// SetServerKey sets a SSL server key.
func (config *TLSConf) SetServerKey(key []byte) {
config.ServerKey = key
config.tlsConfig = nil
config.SetTLSEnabled(true)
}
// SetServerCert sets a SSL server certificate.
func (config *TLSConf) SetServerCert(cert []byte) {
config.ServerCert = cert
config.tlsConfig = nil
config.SetTLSEnabled(true)
}
// SetRootCerts sets a SSL root certificates.
func (config *TLSConf) SetRootCerts(certs ...[]byte) {
config.RootCerts = certs
config.tlsConfig = nil
config.SetTLSEnabled(true)
}
// SetTLSConfig sets a TLS configuration.
func (config *TLSConf) SetTLSConfig(tlsConfig *tls.Config) {
config.tlsConfig = tlsConfig
config.SetTLSEnabled(true)
}
// TLSConfig returns a TLS configuration from the configuration.
func (config *TLSConf) TLSConfig() (*tls.Config, error) {
if !config.IsTLSEnabled() {
return nil, nil
}
if config.tlsConfig != nil {
return config.tlsConfig, nil
}
serverCert, err := tls.X509KeyPair(config.ServerCert, config.ServerKey)
if err != nil {
return nil, err
}
certPool := x509.NewCertPool()
for _, rootCert := range config.RootCerts {
certPool.AppendCertsFromPEM(rootCert)
}
config.tlsConfig = &tls.Config{ // nolint: exhaustruct
MinVersion: tls.VersionTLS12,
Certificates: []tls.Certificate{serverCert},
ClientCAs: certPool,
RootCAs: certPool,
ClientAuth: config.ClientAuthType,
}
return config.tlsConfig, nil
}