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common.go
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common.go
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package main
import (
"bufio"
"crypto/rsa"
"crypto/ecdsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"os"
"strings"
"syscall"
)
const RootPath = "root"
const IntermediatesPath = "intermediates"
const ClientsPath = "clients"
func getPubKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}
func getPath(keyClass, keyName string) string {
var path string
switch keyClass {
case "root":
path = "root"
case "intermediate":
path = "intermediates"
case "client":
path = "clients"
default:
panic("the key class " + keyClass + " is not valid")
}
return path + "/" + keyName
}
func getPrivKeyPath(path string) string {
return path + ".key"
}
func getPubKeyPath(path string) string {
return path + ".pub"
}
func getCertPath(path string) string {
return path + ".crt"
}
func getFullCertPath(path string) string {
return path + ".crt.fullchain"
}
// Load private key file and return both private and public keys
func loadPrivKey(keyType, path string) (interface{}, interface{}, error) {
var err error
var privKeyBytes []byte
var privKeyPem *pem.Block
var privKeyDecryptedBytes []byte
var privKey, pubKey interface{}
var privKeyPath string = getPrivKeyPath(path)
if _, err = os.Stat(privKeyPath); os.IsNotExist(err) {
return privKey, pubKey, errors.New("the private key " + privKeyPath + " does not exist")
}
// Read file, decode it as PEM and load it
privKeyBytes, err = ioutil.ReadFile(privKeyPath)
if err != nil {
return privKey, pubKey, err
}
privKeyPem, _ = pem.Decode(privKeyBytes)
if x509.IsEncryptedPEMBlock(privKeyPem) {
var password string
password, err = getpass("The file " + privKeyPath + " is encrypted, please enter the password to unlock it: ")
if err != nil {
return privKey, pubKey, err
}
privKeyDecryptedBytes, err = x509.DecryptPEMBlock(privKeyPem, []byte(password))
if err != nil {
return privKey, pubKey, err
}
} else {
privKeyDecryptedBytes = privKeyPem.Bytes
}
switch keyType {
case "rsa":
privKey, err = x509.ParsePKCS1PrivateKey(privKeyDecryptedBytes)
if err != nil {
return privKey, pubKey, err
}
case "ecdsa":
privKey, err = x509.ParseECPrivateKey(privKeyDecryptedBytes)
if err != nil {
return privKey, pubKey, err
}
default:
return privKey, pubKey, errors.New("key type " + keyType + " is not implemented")
}
pubKey = getPubKey(privKey)
return privKey, pubKey, nil
}
// Load certificate
func loadCertificate(path string) (certificatePem *pem.Block, certificateX509 *x509.Certificate, err error) {
var rawCertificateBytes []byte
var certPath string = getCertPath(path)
if _, err = os.Stat(certPath); os.IsNotExist(err) {
return certificatePem, certificateX509, errors.New("certificate " + certPath + " does not exist")
}
// Load the certificate
rawCertificateBytes, err = ioutil.ReadFile(certPath)
if err != nil {
return
}
certificatePem, _ = pem.Decode(rawCertificateBytes)
certificateX509, err = x509.ParseCertificate(certificatePem.Bytes)
if err != nil {
return
}
return
}
// Thank you go for not providing a getpass() equivalent in the stdlib
func getpass(prompt string) (string, error) {
var err error
var ws syscall.WaitStatus
// Print the prompt if needed
if prompt != "" {
fmt.Print(prompt)
}
attrs := syscall.ProcAttr{
Dir: "",
Env: []string{},
Files: []uintptr{os.Stdin.Fd()},
Sys: nil,
}
pid, err := syscall.ForkExec("/bin/stty", []string{"stty", "-echo"}, &attrs)
if err != nil {
return "", err
}
_, err = syscall.Wait4(pid, &ws, 0, nil)
if err != nil {
return "", err
}
reader := bufio.NewReader(os.Stdin)
text, err := reader.ReadString('\n')
if err != nil {
return "", err
}
pid, err = syscall.ForkExec("/bin/stty", []string{"stty", "echo"}, &attrs)
if err != nil {
return "", err
}
_, err = syscall.Wait4(pid, &ws, 0, nil)
if err != nil {
return "", err
}
// Print the carriage return that has been swallowed
fmt.Println()
return strings.TrimSpace(text), nil
}