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ssh.go
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ssh.go
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//
// Copyright (c) 2019-2022 Red Hat, Inc.
// 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 asyncstorage
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"golang.org/x/crypto/ssh"
corev1 "k8s.io/api/core/v1"
)
// GetSSHKeyPair returns a pair of SSH keys. The public key is formatted for inclusion in an
// ssh authorized_keys file, and the private key is pem-formatted.
func GetSSHKeyPair() (public, private []byte, err error) {
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, err
}
pcks := x509.MarshalPKCS1PrivateKey(privateKey)
privateKeyPEM := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: pcks,
}
privateKeyBytes := pem.EncodeToMemory(privateKeyPEM)
pubkey, err := ssh.NewPublicKey(&privateKey.PublicKey)
if err != nil {
return nil, nil, err
}
pubKeyBytes := ssh.MarshalAuthorizedKey(pubkey)
return pubKeyBytes, privateKeyBytes, nil
}
func ExtractSSHKeyPairFromSecret(secret *corev1.Secret) (public, private []byte, err error) {
privateKeyPEMBytes, ok := secret.Data[rsyncSSHKeyFilename]
if !ok {
return nil, nil, fmt.Errorf("could not find async storage SSH key in secret %s", secret.Name)
}
privateKeyPEM, rest := pem.Decode(privateKeyPEMBytes)
if len(rest) > 0 {
return nil, nil, fmt.Errorf("additional data encoded in private key")
}
privateKey, err := x509.ParsePKCS1PrivateKey(privateKeyPEM.Bytes)
if err != nil {
return nil, nil, err
}
pubkey, err := ssh.NewPublicKey(&privateKey.PublicKey)
if err != nil {
return nil, nil, err
}
pubkeyBytes := ssh.MarshalAuthorizedKey(pubkey)
return pubkeyBytes, privateKeyPEMBytes, nil
}