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