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|
package main
import (
"crypto/elliptic"
"errors"
"fmt"
"os"
"github.com/gibheer/pki"
)
const (
RsaLowerLength = 2048
RsaUpperLength = 16384
)
var (
// error messages
ErrNoPKFound = errors.New("no private key found")
ErrNoPUFound = errors.New("no public key found")
ErrUnknownFormat = errors.New("key is an unknown format")
// the possible ecdsa curves allowed to be used
EcdsaCurves = []int{224, 256, 384, 521}
// Command to create a private key
CmdCreatePrivateKey = &Command{
Use: "create-private",
Short: "create a private key",
Long: "Create an ecdsa or rsa key with this command",
Example: "create-private -type=ecdsa -length=521",
Run: create_private_key,
}
// private key specific stuff
FlagPrivateKeyGeneration privateKeyGenerationFlags
)
type (
// The flags specific to create a private key
privateKeyGenerationFlags struct {
Type string // type of the private key (rsa, ecdsa)
Curve elliptic.Curve // curve for ecdsa
Size int // bitsize for rsa
}
)
// create a new private key
func create_private_key(cmd *Command, args []string) {
err := checkFlags(checkOutput, checkPrivateKeyGeneration)
if err != nil {
crash_with_help(cmd, ErrorFlagInput, "Flags invalid: %s", err)
}
var pk pki.Pemmer
switch FlagPrivateKeyGeneration.Type {
case "ecdsa":
pk, err = pki.NewPrivateKeyEcdsa(FlagPrivateKeyGeneration.Curve)
case "rsa":
pk, err = pki.NewPrivateKeyRsa(FlagPrivateKeyGeneration.Size)
default:
crash_with_help(cmd, ErrorInput, "Unknown private key type '%s'", FlagPrivateKeyGeneration.Type)
}
if err != nil {
crash_with_help(cmd, ErrorProgram, "Error creating private key: %s", err)
}
marsh_pem, err := pk.MarshalPem()
if err != nil {
crash_with_help(cmd, ErrorProgram, "Error when marshalling to pem: %s", err)
}
_, err = marsh_pem.WriteTo(FlagOutput)
if err != nil {
crash_with_help(cmd, ErrorProgram, "Error when writing output: %s", err)
}
}
// This function adds the private key generation flags.
func InitFlagPrivateKeyGeneration(cmd *Command) {
cmd.Flags().StringVar(&flagContainer.cryptType, "type", "ecdsa", "the type of the private key (ecdsa, rsa)")
cmd.Flags().IntVar(
&flagContainer.length,
"length", 521,
fmt.Sprintf("%d - %d for rsa; one of %v for ecdsa", RsaLowerLength, RsaUpperLength, EcdsaCurves),
)
}
// check the private key generation variables and move them to the work space
func checkPrivateKeyGeneration() error {
pk_type := flagContainer.cryptType
FlagPrivateKeyGeneration.Type = pk_type
switch pk_type {
case "ecdsa":
switch flagContainer.length {
case 224:
FlagPrivateKeyGeneration.Curve = elliptic.P224()
case 256:
FlagPrivateKeyGeneration.Curve = elliptic.P256()
case 384:
FlagPrivateKeyGeneration.Curve = elliptic.P384()
case 521:
FlagPrivateKeyGeneration.Curve = elliptic.P521()
default:
return fmt.Errorf("Curve %d unknown!", flagContainer.length)
}
case "rsa":
size := flagContainer.length
if RsaLowerLength <= size && size <= RsaUpperLength {
FlagPrivateKeyGeneration.Size = size
} else {
return fmt.Errorf("Length of %d is not allowed for rsa!", size)
}
default:
return fmt.Errorf("Type %s is unknown!", pk_type)
}
return nil
}
// add the private key option to the requested flags
func InitFlagPrivateKey(cmd *Command) {
cmd.Flags().StringVar(&flagContainer.privateKeyPath, "private-key", "", "path to the private key (required)")
}
// check the private key flag and load the private key
func checkPrivateKey() error {
if flagContainer.privateKeyPath == "" {
return fmt.Errorf("No private key given!")
}
// check permissions of private key file
info, err := os.Stat(flagContainer.privateKeyPath)
if err != nil {
return fmt.Errorf("Error reading private key: %s", err)
}
if info.Mode().Perm().String()[4:] != "------" {
return fmt.Errorf("private key file modifyable by others!")
}
pk, err := ReadPrivateKeyFile(flagContainer.privateKeyPath)
if err != nil {
return fmt.Errorf("Error reading private key: %s", err)
}
FlagPrivateKey = pk
return nil
}
// Read the private key from the path and try to figure out which type of key it
// might be.
func ReadPrivateKeyFile(path string) (pki.PrivateKey, error) {
raw_pk, err := readSectionFromFile(path, pki.PemLabelEcdsa)
if err == nil {
pk, err := pki.LoadPrivateKeyEcdsa(raw_pk)
if err != nil {
return nil, err
}
return pk, nil
}
raw_pk, err = readSectionFromFile(path, pki.PemLabelRsa)
if err == nil {
pk, err := pki.LoadPrivateKeyRsa(raw_pk)
if err != nil {
return nil, err
}
return pk, nil
}
return nil, ErrNoPKFound
}
// read the public key and try to figure out what kind of key it might be
func ReadPublicKeyFile(path string) (pki.PublicKey, error) {
raw_pu, err := readSectionFromFile(path, pki.PemLabelPublic)
if err != nil {
return nil, ErrNoPUFound
}
var public pki.PublicKey
public, err = pki.LoadPublicKeyEcdsa(raw_pu)
if err == nil {
return public, nil
}
public, err = pki.LoadPublicKeyRsa(raw_pu)
if err == nil {
return public, nil
}
return nil, ErrUnknownFormat
}
|
