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//go:build cgo
// +build cgo
// Copyright 2021 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package app
import (
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"os"
"path/filepath"
"time"
"github.com/ThalesIgnite/crypto11"
"github.com/sigstore/fulcio/pkg/log"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
const (
LABEL = "PKCS11CA"
)
func newCreateCACmd() *cobra.Command {
cmd := &cobra.Command{
Use: "createca",
Short: "Create a root CA in a pkcs11 device",
Long: `Create an x509 root CA within a pkcs11 device using values
such as organization, country etc. This can then be used as the root
certificate authority for an instance of sigstore fulcio`,
Run: runCreateCACmd,
}
cmd.Flags().String("org", "Fulcio Root CA", "Organization name for root CA")
cmd.Flags().String("country", "", "Country name for root CA")
cmd.Flags().String("province", "", "Province name for root CA")
cmd.Flags().String("locality", "", "Locality name for root CA")
cmd.Flags().String("street-address", "", "Street address for root CA")
cmd.Flags().String("postal-code", "", "Postal code for root CA")
cmd.Flags().String("out", "", "output root CA to file")
cmd.Flags().String("hsm", "softhsm", "The HSM provider to use. Valid values: softhsm (default), aws")
cmd.Flags().String("pkcs11-config-path", "config/crypto11.conf", "path to fulcio pkcs11 config file")
cmd.Flags().String("hsm-caroot-id", "", "HSM ID for Root CA")
err := cmd.MarkFlagRequired("hsm-caroot-id")
if err != nil {
log.Logger.Fatal(`Failed to mark flag as required`)
}
return cmd
}
func runCreateCACmd(cmd *cobra.Command, args []string) { //nolint: revive
if err := viper.BindPFlags(cmd.Flags()); err != nil {
log.Logger.Fatal(err)
}
log.Logger.Info("binding to PKCS11 HSM")
p11Ctx, err := crypto11.ConfigureFromFile(viper.GetString("pkcs11-config-path"))
if err != nil {
log.Logger.Fatal(err)
}
defer p11Ctx.Close()
rootID := []byte(viper.GetString("hsm-caroot-id"))
// Check if CA already exists (or a cert within the provided ID)
findCA, err := p11Ctx.FindCertificate(rootID, nil, nil)
if err != nil {
log.Logger.Fatal(err)
}
if findCA != nil {
log.Logger.Fatal("certificate already exists with this ID")
}
// Find the existing Key Pair
// TODO: We could make the TAG customizable
log.Logger.Infof("finding slot for private key label %q", LABEL)
privKey, err := p11Ctx.FindKeyPair(nil, []byte(LABEL))
if err != nil {
log.Logger.Fatal(err)
}
if privKey == nil {
log.Logger.Fatalf("no key pair was found matching label %q", LABEL)
}
pubKey := privKey.Public()
serialNumber, err := cryptoutils.GenerateSerialNumber()
if err != nil {
log.Logger.Fatal(err)
}
rootCA := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{viper.GetString("org")},
Country: []string{viper.GetString("country")},
Province: []string{viper.GetString("province")},
Locality: []string{viper.GetString("locality")},
StreetAddress: []string{viper.GetString("street-address")},
PostalCode: []string{viper.GetString("postal-code")},
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
IsCA: true,
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true, MaxPathLen: 1,
}
caBytes, err := x509.CreateCertificate(rand.Reader, rootCA, rootCA, pubKey, privKey)
if err != nil {
log.Logger.Fatal(err)
}
pemBytes := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: caBytes,
})
log.Logger.Info("Root CA:")
fmt.Println(string(pemBytes))
certParse, err := x509.ParseCertificate(caBytes)
if err != nil {
log.Logger.Fatal(err)
}
// Import the root CA into the HSM
// TODO: We could make the TAG customizable
if viper.GetString("hsm") == "aws" {
log.Logger.Info("Running in AWS mode; skipping root CA storage in HSM")
if !viper.IsSet("out") {
log.Logger.Warn("WARNING: --out is not set. Root CA will not be saved.")
}
} else {
if err = p11Ctx.ImportCertificateWithLabel(rootID, []byte(LABEL), certParse); err != nil {
log.Logger.Fatal(err)
}
log.Logger.Info("root CA created with PKCS11 ID: ", viper.GetString("hsm-caroot-id"))
}
// Save out the file in pem format for easy import to CTL chain
if viper.IsSet("out") {
certOut, err := os.Create(filepath.Clean(viper.GetString("out")))
if err != nil {
log.Logger.Fatal(err)
}
if err := pem.Encode(certOut, &pem.Block{ //nolint
Type: "CERTIFICATE",
Bytes: caBytes},
); err != nil {
certOut.Close()
log.Logger.Fatal(err)
}
certOut.Close()
log.Logger.Info("root CA saved to file: ", viper.GetString("out"))
}
}
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