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tlsconfig.go
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tlsconfig.go
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// Copyright 2019 The Cloudprober 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 tlsconfig implements utilities to parse TLSConfig.
package tlsconfig
import (
"crypto/tls"
"crypto/x509"
"fmt"
"github.com/cloudprober/cloudprober/common/file"
configpb "github.com/cloudprober/cloudprober/common/tlsconfig/proto"
)
// UpdateTLSConfig parses the provided protobuf and updates the tls.Config object.
func UpdateTLSConfig(tlsConfig *tls.Config, c *configpb.TLSConfig) error {
if c.GetDisableCertValidation() {
tlsConfig.InsecureSkipVerify = true
}
if c.GetCaCertFile() != "" {
caCert, err := file.ReadFile(c.GetCaCertFile())
if err != nil {
return fmt.Errorf("common/tlsconfig: error reading CA cert file (%s): %v", c.GetCaCertFile(), err)
}
caCertPool := x509.NewCertPool()
if !caCertPool.AppendCertsFromPEM(caCert) {
return fmt.Errorf("error while adding CA certs from: %s", c.GetCaCertFile())
}
tlsConfig.RootCAs = caCertPool
}
if c.GetTlsCertFile() != "" {
certPEMBlock, err := file.ReadFile(c.GetTlsCertFile())
if err != nil {
return fmt.Errorf("common/tlsconfig: error reading TLS cert file (%s): %v", c.GetTlsCertFile(), err)
}
keyPEMBlock, err := file.ReadFile(c.GetTlsKeyFile())
if err != nil {
return fmt.Errorf("common/tlsconfig: error reading TLS key file (%s): %v", c.GetTlsKeyFile(), err)
}
cert, err := tls.X509KeyPair(certPEMBlock, keyPEMBlock)
if err != nil {
return fmt.Errorf("common/tlsconfig: error initializing cert from cert key pair: %v", err)
}
tlsConfig.Certificates = append(tlsConfig.Certificates, cert)
}
if c.GetServerName() != "" {
tlsConfig.ServerName = c.GetServerName()
}
return nil
}