forked from TrueCloudLab/certificates
343 lines
8.7 KiB
Go
343 lines
8.7 KiB
Go
package main
|
|
|
|
import (
|
|
"context"
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"crypto/sha1"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/hex"
|
|
"encoding/pem"
|
|
"flag"
|
|
"fmt"
|
|
"math/big"
|
|
"os"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
"github.com/smallstep/certificates/kms"
|
|
"github.com/smallstep/certificates/kms/apiv1"
|
|
"go.step.sm/cli-utils/fileutil"
|
|
"go.step.sm/cli-utils/ui"
|
|
"go.step.sm/crypto/pemutil"
|
|
|
|
// Enable yubikey.
|
|
_ "github.com/smallstep/certificates/kms/yubikey"
|
|
)
|
|
|
|
// Config is a mapping of the cli flags.
|
|
type Config struct {
|
|
RootOnly bool
|
|
RootSlot string
|
|
CrtSlot string
|
|
RootFile string
|
|
KeyFile string
|
|
Pin string
|
|
ManagementKey string
|
|
Force bool
|
|
}
|
|
|
|
// Validate checks the flags in the config.
|
|
func (c *Config) Validate() error {
|
|
switch {
|
|
case c.ManagementKey != "" && len(c.ManagementKey) != 48:
|
|
return errors.New("flag `--management-key` must be 48 hexadecimal characters (24 bytes)")
|
|
case c.RootFile != "" && c.KeyFile == "":
|
|
return errors.New("flag `--root` requires flag `--key`")
|
|
case c.KeyFile != "" && c.RootFile == "":
|
|
return errors.New("flag `--key` requires flag `--root`")
|
|
case c.RootOnly && c.RootFile != "":
|
|
return errors.New("flag `--root-only` is incompatible with flag `--root`")
|
|
case c.RootSlot == c.CrtSlot:
|
|
return errors.New("flag `--root-slot` and flag `--crt-slot` cannot be the same")
|
|
case c.RootFile == "" && c.RootSlot == "":
|
|
return errors.New("one of flag `--root` or `--root-slot` is required")
|
|
default:
|
|
if c.RootFile != "" {
|
|
c.RootSlot = ""
|
|
}
|
|
if c.RootOnly {
|
|
c.CrtSlot = ""
|
|
}
|
|
if c.ManagementKey != "" {
|
|
if _, err := hex.DecodeString(c.ManagementKey); err != nil {
|
|
return errors.Wrap(err, "flag `--management-key` is not valid")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
var c Config
|
|
flag.StringVar(&c.ManagementKey, "management-key", "", `Management key to use in hexadecimal format. (default "010203040506070801020304050607080102030405060708")`)
|
|
flag.BoolVar(&c.RootOnly, "root-only", false, "Slot only the root certificate and sign and intermediate.")
|
|
flag.StringVar(&c.RootSlot, "root-slot", "9a", "Slot to store the root certificate.")
|
|
flag.StringVar(&c.CrtSlot, "crt-slot", "9c", "Slot to store the intermediate certificate.")
|
|
flag.StringVar(&c.RootFile, "root", "", "Path to the root certificate to use.")
|
|
flag.StringVar(&c.KeyFile, "key", "", "Path to the root key to use.")
|
|
flag.BoolVar(&c.Force, "force", false, "Force the delete of previous keys.")
|
|
flag.Usage = usage
|
|
flag.Parse()
|
|
|
|
if err := c.Validate(); err != nil {
|
|
fatal(err)
|
|
}
|
|
|
|
pin, err := ui.PromptPassword("What is the YubiKey PIN?")
|
|
if err != nil {
|
|
fatal(err)
|
|
}
|
|
c.Pin = string(pin)
|
|
|
|
k, err := kms.New(context.Background(), apiv1.Options{
|
|
Type: string(apiv1.YubiKey),
|
|
Pin: c.Pin,
|
|
ManagementKey: c.ManagementKey,
|
|
})
|
|
if err != nil {
|
|
fatal(err)
|
|
}
|
|
|
|
// Check if the slots are empty, fail if they are not
|
|
if !c.Force {
|
|
switch {
|
|
case c.RootSlot != "":
|
|
checkSlot(k, c.RootSlot)
|
|
case c.CrtSlot != "":
|
|
checkSlot(k, c.CrtSlot)
|
|
}
|
|
}
|
|
|
|
if err := createPKI(k, c); err != nil {
|
|
fatal(err)
|
|
}
|
|
|
|
defer func() {
|
|
_ = k.Close()
|
|
}()
|
|
}
|
|
|
|
func fatal(err error) {
|
|
if os.Getenv("STEPDEBUG") == "1" {
|
|
fmt.Fprintf(os.Stderr, "%+v\n", err)
|
|
} else {
|
|
fmt.Fprintln(os.Stderr, err)
|
|
}
|
|
os.Exit(1)
|
|
}
|
|
|
|
func usage() {
|
|
fmt.Fprintln(os.Stderr, "Usage: step-yubikey-init")
|
|
fmt.Fprintln(os.Stderr, `
|
|
The step-yubikey-init command initializes a public key infrastructure (PKI)
|
|
to be used by step-ca.
|
|
|
|
This tool is experimental and in the future it will be integrated in step cli.
|
|
|
|
OPTIONS`)
|
|
fmt.Fprintln(os.Stderr)
|
|
flag.PrintDefaults()
|
|
fmt.Fprintln(os.Stderr, `
|
|
COPYRIGHT
|
|
|
|
(c) 2018-2020 Smallstep Labs, Inc.`)
|
|
os.Exit(1)
|
|
}
|
|
|
|
func checkSlot(k kms.KeyManager, slot string) {
|
|
if _, err := k.GetPublicKey(&apiv1.GetPublicKeyRequest{
|
|
Name: slot,
|
|
}); err == nil {
|
|
fmt.Fprintf(os.Stderr, "⚠️ Your YubiKey already has a key in the slot %s.\n", slot)
|
|
fmt.Fprintln(os.Stderr, " If you want to delete it and start fresh, use `--force`.")
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
|
|
func createPKI(k kms.KeyManager, c Config) error {
|
|
var err error
|
|
ui.Println("Creating PKI ...")
|
|
now := time.Now()
|
|
|
|
// Root Certificate
|
|
var signer crypto.Signer
|
|
var root *x509.Certificate
|
|
if c.RootFile != "" && c.KeyFile != "" {
|
|
root, err = pemutil.ReadCertificate(c.RootFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
key, err := pemutil.Read(c.KeyFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var ok bool
|
|
if signer, ok = key.(crypto.Signer); !ok {
|
|
return errors.Errorf("key type '%T' does not implement a signer", key)
|
|
}
|
|
} else {
|
|
resp, err := k.CreateKey(&apiv1.CreateKeyRequest{
|
|
Name: c.RootSlot,
|
|
SignatureAlgorithm: apiv1.ECDSAWithSHA256,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
signer, err = k.CreateSigner(&resp.CreateSignerRequest)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
template := &x509.Certificate{
|
|
IsCA: true,
|
|
NotBefore: now,
|
|
NotAfter: now.Add(time.Hour * 24 * 365 * 10),
|
|
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
|
|
BasicConstraintsValid: true,
|
|
MaxPathLen: 1,
|
|
MaxPathLenZero: false,
|
|
Issuer: pkix.Name{CommonName: "YubiKey Smallstep Root"},
|
|
Subject: pkix.Name{CommonName: "YubiKey Smallstep Root"},
|
|
SerialNumber: mustSerialNumber(),
|
|
SubjectKeyId: mustSubjectKeyID(resp.PublicKey),
|
|
AuthorityKeyId: mustSubjectKeyID(resp.PublicKey),
|
|
}
|
|
|
|
b, err := x509.CreateCertificate(rand.Reader, template, template, resp.PublicKey, signer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
root, err = x509.ParseCertificate(b)
|
|
if err != nil {
|
|
return errors.Wrap(err, "error parsing root certificate")
|
|
}
|
|
|
|
if cm, ok := k.(kms.CertificateManager); ok {
|
|
if err = cm.StoreCertificate(&apiv1.StoreCertificateRequest{
|
|
Name: c.RootSlot,
|
|
Certificate: root,
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if err = fileutil.WriteFile("root_ca.crt", pem.EncodeToMemory(&pem.Block{
|
|
Type: "CERTIFICATE",
|
|
Bytes: b,
|
|
}), 0600); err != nil {
|
|
return err
|
|
}
|
|
|
|
ui.PrintSelected("Root Key", resp.Name)
|
|
ui.PrintSelected("Root Certificate", "root_ca.crt")
|
|
}
|
|
|
|
// Intermediate Certificate
|
|
var keyName string
|
|
var publicKey crypto.PublicKey
|
|
if c.RootOnly {
|
|
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
|
|
if err != nil {
|
|
return errors.Wrap(err, "error creating intermediate key")
|
|
}
|
|
|
|
pass, err := ui.PromptPasswordGenerate("What do you want your password to be? [leave empty and we'll generate one]",
|
|
ui.WithRichPrompt())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = pemutil.Serialize(priv, pemutil.WithPassword(pass), pemutil.ToFile("intermediate_ca_key", 0600))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
publicKey = priv.Public()
|
|
} else {
|
|
resp, err := k.CreateKey(&apiv1.CreateKeyRequest{
|
|
Name: c.CrtSlot,
|
|
SignatureAlgorithm: apiv1.ECDSAWithSHA256,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
publicKey = resp.PublicKey
|
|
keyName = resp.Name
|
|
}
|
|
|
|
template := &x509.Certificate{
|
|
IsCA: true,
|
|
NotBefore: now,
|
|
NotAfter: now.Add(time.Hour * 24 * 365 * 10),
|
|
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
|
|
BasicConstraintsValid: true,
|
|
MaxPathLen: 0,
|
|
MaxPathLenZero: true,
|
|
Issuer: root.Subject,
|
|
Subject: pkix.Name{CommonName: "YubiKey Smallstep Intermediate"},
|
|
SerialNumber: mustSerialNumber(),
|
|
SubjectKeyId: mustSubjectKeyID(publicKey),
|
|
}
|
|
|
|
b, err := x509.CreateCertificate(rand.Reader, template, root, publicKey, signer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
intermediate, err := x509.ParseCertificate(b)
|
|
if err != nil {
|
|
return errors.Wrap(err, "error parsing intermediate certificate")
|
|
}
|
|
|
|
if cm, ok := k.(kms.CertificateManager); ok {
|
|
if err = cm.StoreCertificate(&apiv1.StoreCertificateRequest{
|
|
Name: c.CrtSlot,
|
|
Certificate: intermediate,
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if err = fileutil.WriteFile("intermediate_ca.crt", pem.EncodeToMemory(&pem.Block{
|
|
Type: "CERTIFICATE",
|
|
Bytes: b,
|
|
}), 0600); err != nil {
|
|
return err
|
|
}
|
|
|
|
if c.RootOnly {
|
|
ui.PrintSelected("Intermediate Key", "intermediate_ca_key")
|
|
} else {
|
|
ui.PrintSelected("Intermediate Key", keyName)
|
|
}
|
|
|
|
ui.PrintSelected("Intermediate Certificate", "intermediate_ca.crt")
|
|
|
|
return nil
|
|
}
|
|
|
|
func mustSerialNumber() *big.Int {
|
|
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
|
|
sn, err := rand.Int(rand.Reader, serialNumberLimit)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return sn
|
|
}
|
|
|
|
func mustSubjectKeyID(key crypto.PublicKey) []byte {
|
|
b, err := x509.MarshalPKIXPublicKey(key)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
hash := sha1.Sum(b)
|
|
return hash[:]
|
|
}
|