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package client
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"os"
"github.com/mimecast/dtail/internal/io/dlog"
"golang.org/x/crypto/ssh"
)
// GeneratePrivatePublicKeyPairIfNotExists generates a SSH key pair (used by the integration tests)
func GeneratePrivatePublicKeyPairIfNotExists(keyPath string, bitSize int) {
if _, err := os.Stat(keyPath); err == nil {
dlog.Client.Debug("Private/public key pair already exists", keyPath)
return
}
GeneratePrivatePublicKeyPair(keyPath, bitSize)
}
// GeneratePrivatePublicKeyPair generates a SSH key pair (used by the integration tests)
func GeneratePrivatePublicKeyPair(keyPath string, bitSize int) {
privateKeyPath := keyPath
publicKeyPath := fmt.Sprintf("%s.pub", keyPath)
dlog.Client.Debug("Generating private/public key pair", privateKeyPath, publicKeyPath)
privateKey, err := generatePrivateKey(bitSize)
if err != nil {
dlog.Client.FatalPanic(err)
}
publicKeyBytes, err := generatePublicKey(&privateKey.PublicKey)
if err != nil {
dlog.Client.FatalPanic(err)
}
privateKeyBytes := encodePrivateKeyToPEM(privateKey)
err = writeKey(privateKeyBytes, privateKeyPath)
if err != nil {
dlog.Client.FatalPanic(err)
}
err = writeKey([]byte(publicKeyBytes), publicKeyPath)
if err != nil {
dlog.Client.FatalPanic(err)
}
dlog.Client.Debug("Done generating private/public key pair", privateKeyPath, publicKeyPath)
}
func generatePrivateKey(bitSize int) (*rsa.PrivateKey, error) {
privateKey, err := rsa.GenerateKey(rand.Reader, bitSize)
if err != nil {
return nil, err
}
err = privateKey.Validate()
if err != nil {
return nil, err
}
return privateKey, nil
}
func encodePrivateKeyToPEM(privateKey *rsa.PrivateKey) []byte {
privDER := x509.MarshalPKCS1PrivateKey(privateKey)
privBlock := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: privDER,
}
privatePEM := pem.EncodeToMemory(&privBlock)
return privatePEM
}
func generatePublicKey(privatekey *rsa.PublicKey) ([]byte, error) {
publicRsaKey, err := ssh.NewPublicKey(privatekey)
if err != nil {
return nil, err
}
pubKeyBytes := ssh.MarshalAuthorizedKey(publicRsaKey)
return pubKeyBytes, nil
}
func writeKey(keyBytes []byte, saveFileTo string) error {
err := ioutil.WriteFile(saveFileTo, keyBytes, 0600)
if err != nil {
return err
}
return nil
}
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