/
vpn_tlsauth.go
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/
vpn_tlsauth.go
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// Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 secrets
import (
"github.com/gardener/gardener/pkg/utils"
)
// DataKeyVPNTLSAuth is the key in a secret data holding the vpn tlsauth key.
const DataKeyVPNTLSAuth = "vpn.tlsauth"
// VPNTLSAuthConfig contains the specification for a to-be-generated vpn tls authentication secret.
// The key will be generated by the provided VPNTLSAuthKeyGenerator. By default the openvpn command is used to generate the key if no generator function is specified.
type VPNTLSAuthConfig struct {
Name string
VPNTLSAuthKeyGenerator func() ([]byte, error)
}
// VPNTLSAuth contains the name and the generated vpn tls authentication key.
type VPNTLSAuth struct {
Name string
TLSAuthKey []byte
}
// GetName returns the name of the secret.
func (s *VPNTLSAuthConfig) GetName() string {
return s.Name
}
// Generate implements ConfigInterface.
func (s *VPNTLSAuthConfig) Generate() (DataInterface, error) {
key, err := s.generateKey()
if err != nil {
return nil, err
}
return &VPNTLSAuth{
Name: s.Name,
TLSAuthKey: key,
}, nil
}
func (s *VPNTLSAuthConfig) generateKey() (key []byte, err error) {
if s.VPNTLSAuthKeyGenerator != nil {
key, err = s.VPNTLSAuthKeyGenerator()
} else {
key, err = GenerateVPNKey()
}
return
}
// SecretData computes the data map which can be used in a Kubernetes secret.
func (v *VPNTLSAuth) SecretData() map[string][]byte {
data := map[string][]byte{
DataKeyVPNTLSAuth: v.TLSAuthKey,
}
return data
}
// generateVPNKey generates PSK for OpenVPN similar as generated by `openvpn --genkey` command.
func generateVPNKey() ([]byte, error) {
allowedCharacters := "0123456789abcdef"
keyString, err := utils.GenerateRandomStringFromCharset(512, allowedCharacters)
if err != nil {
return nil, err
}
var formattedKeyString string
for i := 0; i < 16; i++ {
formattedKeyString = formattedKeyString + keyString[i*32:((i+1)*32)] + "\n"
}
startString := "-----BEGIN OpenVPN Static key V1-----\n"
endString := "-----END OpenVPN Static key V1-----"
key := startString + formattedKeyString + endString
return []byte(key), nil
}