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ssh.go
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ssh.go
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package util
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/rs/zerolog/log"
"golang.org/x/crypto/ssh"
)
// SSHGenerator ssh key pair generator
type SSHGenerator struct {
PrivateKey, PublicKey []byte
PrivateKeyPath string
}
// NewSSHGenerator create ssh generator
func NewSSHGenerator(privateKey string, publicKey string, privateKeyPath string) *SSHGenerator {
return &SSHGenerator{
PrivateKey: []byte(privateKey),
PublicKey: []byte(publicKey),
PrivateKeyPath: privateKeyPath,
}
}
// Generate generate SSHGenerator
func Generate(privateKeyPath string) (*SSHGenerator, error) {
privateKey, err := generatePrivateKey(SshBitSize)
if err != nil {
return nil, err
}
publicKeyBytes, err := encodePublicKey(&privateKey.PublicKey)
if err != nil {
return nil, err
}
privateKeyBytes := encodePrivateKeyToPEM(privateKey)
sshKey := &SSHGenerator{
PrivateKey: privateKeyBytes,
PrivateKeyPath: privateKeyPath,
PublicKey: publicKeyBytes,
}
_ = os.Remove(sshKey.PrivateKeyPath)
err = WritePrivateKey(sshKey.PrivateKeyPath, sshKey.PrivateKey)
return sshKey, err
}
// PrivateKeyPath ...
func PrivateKeyPath(name string) string {
return fmt.Sprintf("%s/pk/%s%s", KtHome, name, PostfixRsaKey)
}
// CleanRsaKeys ...
func CleanRsaKeys() {
dir := fmt.Sprintf("%s/pk/", KtHome)
files, _ := ioutil.ReadDir(dir)
for _, f := range files {
if strings.HasSuffix(f.Name(), PostfixRsaKey) {
rsaKey := fmt.Sprintf("%s/%s", dir, f.Name())
err := os.Remove(rsaKey)
if err != nil {
log.Debug().Msgf("Failed to remove rsa key file: %s", rsaKey)
} else {
log.Info().Msgf("Unused rsa key %s removed", f.Name())
}
}
}
}
// generatePrivateKey creates a RSA Private Key of specified byte size
func generatePrivateKey(bitSize int) (*rsa.PrivateKey, error) {
// Private Key generation
privateKey, err := rsa.GenerateKey(rand.Reader, bitSize)
if err != nil {
return nil, err
}
// Validate Private Key
err = privateKey.Validate()
if err != nil {
return nil, err
}
log.Debug().Msg("Private Key generated")
return privateKey, nil
}
// encodePrivateKeyToPEM encodes Private Key from RSA to PEM format
func encodePrivateKeyToPEM(privateKey *rsa.PrivateKey) []byte {
// Get ASN.1 DER format
privDER := x509.MarshalPKCS1PrivateKey(privateKey)
// pem.Block
privBlock := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: privDER,
}
// Private key in PEM format
privatePEM := pem.EncodeToMemory(&privBlock)
return privatePEM
}
// encodePublicKey take a rsa.PublicKey and return bytes suitable for writing to .pub file
// return format "ssh-rsa ..."
func encodePublicKey(publicKey *rsa.PublicKey) ([]byte, error) {
publicRsaKey, err := ssh.NewPublicKey(publicKey)
if err != nil {
return nil, err
}
pubKeyBytes := ssh.MarshalAuthorizedKey(publicRsaKey)
log.Debug().Msg("Public key generated")
return pubKeyBytes, nil
}
// WritePrivateKey write ssh private key to privateKeyPath
func WritePrivateKey(privateKeyPath string, data []byte) error {
dir := filepath.Dir(privateKeyPath)
if _, err := os.Stat(dir); os.IsNotExist(err) {
if err = os.MkdirAll(dir, 0700); err != nil {
log.Error().Err(err).Msgf("Can't create dir %s", dir)
return err
}
}
if err := ioutil.WriteFile(privateKeyPath, data, 0400); err != nil {
log.Error().Err(err).Msgf("Write ssh private key to %s failed", privateKeyPath)
return err
}
return nil
}