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tlsconfig.go
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tlsconfig.go
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package crypto
/*
* Copyright 2020 Aldelo, LP
*
* 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.
*/
import (
"crypto/tls"
"crypto/x509"
"fmt"
util "github.com/aldelo/common"
"io/ioutil"
)
type TlsConfig struct {}
// GetServerTlsConfig returns *tls.config configured for server TLS or mTLS based on parameters
//
// serverCertPemPath = (required) path and file name to the server cert pem (unencrypted version)
// serverKeyPemPath = (required) path and file name to the server key pem (unencrypted version)
// clientCaCertPath = (optional) one or more client ca cert path and file name, in case tls.config is for mTLS
func (t *TlsConfig) GetServerTlsConfig(serverCertPemPath string,
serverKeyPemPath string,
clientCaCertPemPath []string) (*tls.Config, error) {
if util.LenTrim(serverCertPemPath) == 0 || util.LenTrim(serverKeyPemPath) == 0 {
return nil, fmt.Errorf("Server TLS Config Requires Server Certificate and Key Pem Path")
}
// create server cert
serverCert, err := tls.LoadX509KeyPair(serverCertPemPath, serverKeyPemPath)
if err != nil {
return nil, fmt.Errorf("Load X509 Key Pair Failed: %s", err.Error())
}
// if client ca cert pem defined, prep for mTLS
certPool := x509.NewCertPool()
certPoolCount := 0
if len(clientCaCertPemPath) > 0 {
for _, v := range clientCaCertPemPath {
if util.LenTrim(v) > 0 {
if clientCa, e := ioutil.ReadFile(v); e != nil {
return nil, fmt.Errorf("Read Client CA Pem Failed: (%s) %s", v, e.Error())
} else {
if !certPool.AppendCertsFromPEM(clientCa) {
// fail to add client ca to cert pool
return nil, fmt.Errorf("Append Client CA From Pem Failed: %s", v)
} else {
// client ca pem appended to ca pool
certPoolCount++
}
}
}
}
}
config := &tls.Config{
Certificates: []tls.Certificate{
serverCert,
},
MinVersion: tls.VersionTLS12,
CurvePreferences: []tls.CurveID{
tls.CurveP521,
tls.CurveP384,
tls.CurveP256,
},
PreferServerCipherSuites: true,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
},
}
if certPoolCount > 0 {
config.ClientAuth = tls.RequireAndVerifyClientCert
config.ClientCAs = certPool
} else {
config.ClientAuth = tls.NoClientCert
}
return config, nil
}
// GetClientTlsConfig returns *tls.config configured for server TLS or mTLS based on parameters
//
// serverCaCertPath = (required) one or more server ca cert path and file name, required for both server TLS or mTLS
// clientCertPemPath = (optional) for mTLS setup, path and file name to the client cert pem (unencrypted version)
// clientKeyPemPath = (optional) for mTLS setup, path and file name to the client key pem (unencrypted version)
func (t *TlsConfig) GetClientTlsConfig(serverCaCertPemPath []string,
clientCertPemPath string,
clientKeyPemPath string) (*tls.Config, error) {
if len(serverCaCertPemPath) == 0 {
return nil, fmt.Errorf("Client TLS Config Requires Server CA Certificate Pem Path")
}
certPool := x509.NewCertPool()
for _, v := range serverCaCertPemPath {
if util.LenTrim(v) > 0 {
if serverCa, e := ioutil.ReadFile(v); e != nil {
return nil, fmt.Errorf("Read Server CA Pem Failed: (%s) %s", v, e.Error())
} else {
if !certPool.AppendCertsFromPEM(serverCa) {
// fail to add server ca to cert pool
return nil, fmt.Errorf("Append Server CA From Pem Failed: %s", v)
}
}
}
}
config := &tls.Config{
RootCAs: certPool,
}
// for mTls set client cert
if util.LenTrim(clientCertPemPath) > 0 && util.LenTrim(clientKeyPemPath) > 0 {
if clientCert, e := tls.LoadX509KeyPair(clientCertPemPath, clientKeyPemPath); e != nil {
return nil, fmt.Errorf("Load X509 Key Pair Failed: %s", e.Error())
} else {
config.Certificates = []tls.Certificate{
clientCert,
}
}
}
return config, nil
}