/
rsa_private_key.go
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/
rsa_private_key.go
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// Copyright (c) 2018 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 (
"bytes"
"crypto/rand"
"crypto/rsa"
"fmt"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/infodata"
"golang.org/x/crypto/ssh"
)
const (
// DataKeyRSAPrivateKey is the key in a secret data holding the RSA private key.
DataKeyRSAPrivateKey = "id_rsa"
// DataKeySSHAuthorizedKeys is the key in a secret data holding the OpenSSH authorized keys.
DataKeySSHAuthorizedKeys = "id_rsa.pub"
)
// RSASecretConfig containing information about the number of bits which should be used for the to-be-created RSA private key.
type RSASecretConfig struct {
Name string
Bits int
UsedForSSH bool
}
// RSAKeys contains the private key, the public key, and optionally the OpenSSH-formatted authorized keys file data.
type RSAKeys struct {
Name string
PrivateKey *rsa.PrivateKey
PublicKey *rsa.PublicKey
OpenSSHAuthorizedKey []byte
}
// GetName returns the name of the secret.
func (s *RSASecretConfig) GetName() string {
return s.Name
}
// Generate implements ConfigInterface.
func (s *RSASecretConfig) Generate() (DataInterface, error) {
return s.GenerateRSAKeys()
}
// GenerateInfoData implements ConfigInterface.
func (s *RSASecretConfig) GenerateInfoData() (infodata.InfoData, error) {
privateKey, err := generateRSAPrivateKey(s.Bits)
if err != nil {
return nil, err
}
return NewPrivateKeyInfoData(utils.EncodePrivateKey(privateKey)), nil
}
// GenerateFromInfoData implements ConfigInterface
func (s *RSASecretConfig) GenerateFromInfoData(infoData infodata.InfoData) (DataInterface, error) {
data, ok := infoData.(*PrivateKeyInfoData)
if !ok {
return nil, fmt.Errorf("could not convert InfoData entry %s to RSAPrivateKeyInfoData", s.Name)
}
privateKey, err := utils.DecodePrivateKey(data.PrivateKey)
if err != nil {
return nil, fmt.Errorf("could not load privateKey secret %s: %w", s.Name, err)
}
return s.generateWithPrivateKey(privateKey)
}
// LoadFromSecretData implements infodata.Loader
func (s *RSASecretConfig) LoadFromSecretData(secretData map[string][]byte) (infodata.InfoData, error) {
privateKey := secretData[DataKeyRSAPrivateKey]
return NewPrivateKeyInfoData(privateKey), nil
}
// GenerateRSAKeys computes a RSA private key based on the configured number of bits.
func (s *RSASecretConfig) GenerateRSAKeys() (*RSAKeys, error) {
privateKey, err := generateRSAPrivateKey(s.Bits)
if err != nil {
return nil, err
}
return s.generateWithPrivateKey(privateKey)
}
func (s *RSASecretConfig) generateWithPrivateKey(privateKey *rsa.PrivateKey) (*RSAKeys, error) {
rsa := &RSAKeys{
Name: s.Name,
PrivateKey: privateKey,
PublicKey: &privateKey.PublicKey,
}
if s.UsedForSSH {
sshPublicKey, err := generateSSHAuthorizedKeys(rsa.PrivateKey)
if err != nil {
return nil, err
}
rsa.OpenSSHAuthorizedKey = sshPublicKey
}
return rsa, nil
}
// SecretData computes the data map which can be used in a Kubernetes secret.
func (r *RSAKeys) SecretData() map[string][]byte {
data := map[string][]byte{
DataKeyRSAPrivateKey: utils.EncodePrivateKey(r.PrivateKey),
}
if r.OpenSSHAuthorizedKey != nil {
data[DataKeySSHAuthorizedKeys] = r.OpenSSHAuthorizedKey
}
return data
}
// generateRSAPrivateKey generates a RSA private for the given number of <bits>.
func generateRSAPrivateKey(bits int) (*rsa.PrivateKey, error) {
return rsa.GenerateKey(rand.Reader, bits)
}
// generateSSHAuthorizedKeys takes a RSA private key <privateKey> and generates the corresponding public key.
// It serializes the public key for inclusion in an OpenSSH `authorized_keys` file and it trims the new-
// line at the end.
func generateSSHAuthorizedKeys(privateKey *rsa.PrivateKey) ([]byte, error) {
pubKey, err := ssh.NewPublicKey(&privateKey.PublicKey)
if err != nil {
return nil, err
}
publicKey := ssh.MarshalAuthorizedKey(pubKey)
return bytes.Trim(publicKey, "\x0a"), nil
}