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main.go
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main.go
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package main
import (
"context"
"crypto"
"crypto/rand"
"crypto/sha1"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"flag"
"fmt"
"math/big"
"os"
"time"
"github.com/smallstep/certificates/kms/apiv1"
"github.com/smallstep/certificates/kms/awskms"
"go.step.sm/cli-utils/fileutil"
"go.step.sm/cli-utils/ui"
"go.step.sm/crypto/pemutil"
"golang.org/x/crypto/ssh"
)
func main() {
var credentialsFile, region string
var ssh bool
flag.StringVar(&credentialsFile, "credentials-file", "", "Path to the `file` containing the AWS KMS credentials.")
flag.StringVar(®ion, "region", "", "AWS KMS region name.")
flag.BoolVar(&ssh, "ssh", false, "Create SSH keys.")
flag.Usage = usage
flag.Parse()
c, err := awskms.New(context.Background(), apiv1.Options{
Type: string(apiv1.AmazonKMS),
Region: region,
CredentialsFile: credentialsFile,
})
if err != nil {
fatal(err)
}
if err := createX509(c); err != nil {
fatal(err)
}
if ssh {
ui.Println()
if err := createSSH(c); err != nil {
fatal(err)
}
}
}
func fatal(err error) {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
func usage() {
fmt.Fprintln(os.Stderr, "Usage: step-awskms-init")
fmt.Fprintln(os.Stderr, `
The step-awskms-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 createX509(c *awskms.KMS) error {
ui.Println("Creating X.509 PKI ...")
// Root Certificate
resp, err := c.CreateKey(&apiv1.CreateKeyRequest{
Name: "root",
SignatureAlgorithm: apiv1.ECDSAWithSHA256,
})
if err != nil {
return err
}
signer, err := c.CreateSigner(&resp.CreateSignerRequest)
if err != nil {
return err
}
now := time.Now()
root := &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: "Smallstep Root"},
Subject: pkix.Name{CommonName: "Smallstep Root"},
SerialNumber: mustSerialNumber(),
SubjectKeyId: mustSubjectKeyID(resp.PublicKey),
AuthorityKeyId: mustSubjectKeyID(resp.PublicKey),
}
b, err := x509.CreateCertificate(rand.Reader, root, root, resp.PublicKey, signer)
if 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")
root, err = pemutil.ReadCertificate("root_ca.crt")
if err != nil {
return err
}
// Intermediate Certificate
resp, err = c.CreateKey(&apiv1.CreateKeyRequest{
Name: "intermediate",
SignatureAlgorithm: apiv1.ECDSAWithSHA256,
})
if err != nil {
return err
}
intermediate := &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: "Smallstep Intermediate"},
SerialNumber: mustSerialNumber(),
SubjectKeyId: mustSubjectKeyID(resp.PublicKey),
}
b, err = x509.CreateCertificate(rand.Reader, intermediate, root, resp.PublicKey, signer)
if err != nil {
return err
}
if err = fileutil.WriteFile("intermediate_ca.crt", pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: b,
}), 0600); err != nil {
return err
}
ui.PrintSelected("Intermediate Key", resp.Name)
ui.PrintSelected("Intermediate Certificate", "intermediate_ca.crt")
return nil
}
func createSSH(c *awskms.KMS) error {
ui.Println("Creating SSH Keys ...")
// User Key
resp, err := c.CreateKey(&apiv1.CreateKeyRequest{
Name: "ssh-user-key",
SignatureAlgorithm: apiv1.ECDSAWithSHA256,
})
if err != nil {
return err
}
key, err := ssh.NewPublicKey(resp.PublicKey)
if err != nil {
return err
}
if err = fileutil.WriteFile("ssh_user_ca_key.pub", ssh.MarshalAuthorizedKey(key), 0600); err != nil {
return err
}
ui.PrintSelected("SSH User Public Key", "ssh_user_ca_key.pub")
ui.PrintSelected("SSH User Private Key", resp.Name)
// Host Key
resp, err = c.CreateKey(&apiv1.CreateKeyRequest{
Name: "ssh-host-key",
SignatureAlgorithm: apiv1.ECDSAWithSHA256,
})
if err != nil {
return err
}
key, err = ssh.NewPublicKey(resp.PublicKey)
if err != nil {
return err
}
if err = fileutil.WriteFile("ssh_host_ca_key.pub", ssh.MarshalAuthorizedKey(key), 0600); err != nil {
return err
}
ui.PrintSelected("SSH Host Public Key", "ssh_host_ca_key.pub")
ui.PrintSelected("SSH Host Private Key", resp.Name)
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[:]
}