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tls.go
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tls.go
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// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package staking
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"math/big"
"os"
"path/filepath"
"time"
"github.com/ava-labs/avalanchego/utils/perms"
)
// InitNodeStakingKeyPair generates a self-signed TLS key/cert pair to use in
// staking. The key and files will be placed at [keyPath] and [certPath],
// respectively. If there is already a file at [keyPath], returns nil.
func InitNodeStakingKeyPair(keyPath, certPath string) error {
// If there is already a file at [keyPath], do nothing
if _, err := os.Stat(keyPath); !os.IsNotExist(err) {
return nil
}
certBytes, keyBytes, err := NewCertAndKeyBytes()
if err != nil {
return err
}
// Ensure directory where key/cert will live exist
if err := os.MkdirAll(filepath.Dir(certPath), perms.ReadWriteExecute); err != nil {
return fmt.Errorf("couldn't create path for cert: %w", err)
}
if err := os.MkdirAll(filepath.Dir(keyPath), perms.ReadWriteExecute); err != nil {
return fmt.Errorf("couldn't create path for key: %w", err)
}
// Write cert to disk
certFile, err := os.Create(certPath)
if err != nil {
return fmt.Errorf("couldn't create cert file: %w", err)
}
if _, err := certFile.Write(certBytes); err != nil {
return fmt.Errorf("couldn't write cert file: %w", err)
}
if err := certFile.Close(); err != nil {
return fmt.Errorf("couldn't close cert file: %w", err)
}
if err := os.Chmod(certPath, perms.ReadOnly); err != nil { // Make cert read-only
return fmt.Errorf("couldn't change permissions on cert: %w", err)
}
// Write key to disk
keyOut, err := os.Create(keyPath)
if err != nil {
return fmt.Errorf("couldn't create key file: %w", err)
}
if _, err := keyOut.Write(keyBytes); err != nil {
return fmt.Errorf("couldn't write private key: %w", err)
}
if err := keyOut.Close(); err != nil {
return fmt.Errorf("couldn't close key file: %w", err)
}
if err := os.Chmod(keyPath, perms.ReadOnly); err != nil { // Make key read-only
return fmt.Errorf("couldn't change permissions on key: %w", err)
}
return nil
}
func LoadTLSCertFromBytes(keyBytes, certBytes []byte) (*tls.Certificate, error) {
cert, err := tls.X509KeyPair(certBytes, keyBytes)
if err != nil {
return nil, fmt.Errorf("failed creating cert: %w", err)
}
cert.Leaf, err = x509.ParseCertificate(cert.Certificate[0])
if err != nil {
return nil, fmt.Errorf("failed parsing cert: %w", err)
}
return &cert, nil
}
func LoadTLSCertFromFiles(keyPath, certPath string) (*tls.Certificate, error) {
cert, err := tls.LoadX509KeyPair(certPath, keyPath)
if err != nil {
return nil, err
}
cert.Leaf, err = x509.ParseCertificate(cert.Certificate[0])
if err != nil {
return nil, fmt.Errorf("failed parsing cert: %w", err)
}
return &cert, nil
}
func NewTLSCert() (*tls.Certificate, error) {
certBytes, keyBytes, err := NewCertAndKeyBytes()
if err != nil {
return nil, err
}
cert, err := tls.X509KeyPair(certBytes, keyBytes)
if err != nil {
return nil, err
}
cert.Leaf, err = x509.ParseCertificate(cert.Certificate[0])
return &cert, err
}
// Creates a new staking private key / staking certificate pair.
// Returns the PEM byte representations of both.
func NewCertAndKeyBytes() ([]byte, []byte, error) {
// Create key to sign cert with
key, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return nil, nil, fmt.Errorf("couldn't generate rsa key: %w", err)
}
// Create self-signed staking cert
certTemplate := &x509.Certificate{
SerialNumber: big.NewInt(0),
NotBefore: time.Date(2000, time.January, 0, 0, 0, 0, 0, time.UTC),
NotAfter: time.Now().AddDate(100, 0, 0),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageDataEncipherment,
BasicConstraintsValid: true,
}
certBytes, err := x509.CreateCertificate(rand.Reader, certTemplate, certTemplate, &key.PublicKey, key)
if err != nil {
return nil, nil, fmt.Errorf("couldn't create certificate: %w", err)
}
var certBuff bytes.Buffer
if err := pem.Encode(&certBuff, &pem.Block{Type: "CERTIFICATE", Bytes: certBytes}); err != nil {
return nil, nil, fmt.Errorf("couldn't write cert file: %w", err)
}
privBytes, err := x509.MarshalPKCS8PrivateKey(key)
if err != nil {
return nil, nil, fmt.Errorf("couldn't marshal private key: %w", err)
}
var keyBuff bytes.Buffer
if err := pem.Encode(&keyBuff, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
return nil, nil, fmt.Errorf("couldn't write private key: %w", err)
}
return certBuff.Bytes(), keyBuff.Bytes(), nil
}