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// Copyright 2020 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package task
import (
"context"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"os"
"path/filepath"
"github.com/pingcap/errors"
"github.com/pingcap/tiup/pkg/cluster/ctxt"
"github.com/pingcap/tiup/pkg/crypto/rand"
"github.com/pingcap/tiup/pkg/utils"
"golang.org/x/crypto/ssh"
)
// SSHKeyGen is used to generate SSH key
type SSHKeyGen struct {
keypath string
}
// Execute implements the Task interface
func (s *SSHKeyGen) Execute(ctx context.Context) error {
ctxt.GetInner(ctx).Ev.PublishTaskProgress(s, "Generate SSH keys")
savePrivateFileTo := s.keypath
savePublicFileTo := s.keypath + ".pub"
// Skip ssh key generate
if utils.IsExist(savePrivateFileTo) && utils.IsExist(savePublicFileTo) {
ctxt.GetInner(ctx).PublicKeyPath = savePublicFileTo
ctxt.GetInner(ctx).PrivateKeyPath = savePrivateFileTo
return nil
}
bitSize := 4096
ctxt.GetInner(ctx).Ev.PublishTaskProgress(s, "Generate private key")
privateKey, err := s.generatePrivateKey(bitSize)
if err != nil {
return errors.Trace(err)
}
ctxt.GetInner(ctx).Ev.PublishTaskProgress(s, "Generate public key")
publicKeyBytes, err := s.generatePublicKey(&privateKey.PublicKey)
if err != nil {
return errors.Trace(err)
}
privateKeyBytes := s.encodePrivateKeyToPEM(privateKey)
ctxt.GetInner(ctx).Ev.PublishTaskProgress(s, "Persist keys")
err = s.writeKeyToFile(privateKeyBytes, savePrivateFileTo)
if err != nil {
return errors.Trace(err)
}
err = s.writeKeyToFile(publicKeyBytes, savePublicFileTo)
if err != nil {
return errors.Trace(err)
}
ctxt.GetInner(ctx).PublicKeyPath = savePublicFileTo
ctxt.GetInner(ctx).PrivateKeyPath = savePrivateFileTo
return nil
}
// generatePrivateKey creates a RSA Private Key of specified byte size
func (s *SSHKeyGen) 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
}
return privateKey, nil
}
// encodePrivateKeyToPEM encodes Private Key from RSA to PEM format
func (s *SSHKeyGen) 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
return pem.EncodeToMemory(&privBlock)
}
// generatePublicKey take a rsa.PublicKey and return bytes suitable for writing to .pub file
// returns in the format "ssh-rsa ..."
func (s *SSHKeyGen) generatePublicKey(privatekey *rsa.PublicKey) ([]byte, error) {
publicRsaKey, err := ssh.NewPublicKey(privatekey)
if err != nil {
return nil, err
}
return ssh.MarshalAuthorizedKey(publicRsaKey), nil
}
// writePemToFile writes keys to a file
func (s *SSHKeyGen) writeKeyToFile(keyBytes []byte, saveFileTo string) error {
if err := os.MkdirAll(filepath.Dir(saveFileTo), 0700); err != nil {
return err
}
return os.WriteFile(saveFileTo, keyBytes, 0600)
}
// Rollback implements the Task interface
func (s *SSHKeyGen) Rollback(ctx context.Context) error {
return os.Remove(s.keypath)
}
// String implements the fmt.Stringer interface
func (s *SSHKeyGen) String() string {
return fmt.Sprintf("SSHKeyGen: path=%s", s.keypath)
}
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