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tls.go
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tls.go
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// Copyright 2023 LY Corporation
//
// 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 token
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"os"
)
// NewTLSConfig returns a *tls.Config with provided certificate and key. If ca != "", client authentication is enabled.
func NewTLSConfig(ca, cert, key string) (*tls.Config, error) {
t := &tls.Config{
MinVersion: tls.VersionTLS12,
CurvePreferences: []tls.CurveID{
tls.CurveP521,
tls.CurveP384,
tls.CurveP256,
tls.X25519,
}, // TODO: copy from sidecar, need further review
SessionTicketsDisabled: true, // TODO: copy from sidecar, need further review
ClientAuth: tls.NoClientCert,
}
// server TLS certificate and key
crt, err := tls.LoadX509KeyPair(cert, key)
if err != nil {
return nil, fmt.Errorf("Cannot load X509 key pair cert [%q], key [%q]: %w", cert, key, err)
}
t.Certificates = make([]tls.Certificate, 1)
t.Certificates[0] = crt
// optional CA certificate for client
if ca != "" {
pool, err := NewX509CertPool(ca)
if err != nil {
return nil, fmt.Errorf("Cannot load CA cert [%q]: %w", ca, err)
}
t.ClientCAs = pool
t.ClientAuth = tls.RequireAndVerifyClientCert
}
return t, nil
}
// NewX509CertPool returns a certificate pool with the system CAs and the extra CA specified.
func NewX509CertPool(extraCA string) (pool *x509.CertPool, err error) {
caByte, err := os.ReadFile(extraCA)
if err != nil {
return nil, err
}
// load system CAs
pool, err = x509.SystemCertPool()
if err != nil || pool == nil {
pool = x509.NewCertPool()
}
if !pool.AppendCertsFromPEM(caByte) {
return nil, errors.New("Cannot append CA certificate to pool")
}
return pool, err
}