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get_ca_cert.go
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get_ca_cert.go
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/*
Copyright AppsCode Inc.
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 cmds
import (
"bufio"
"crypto/rsa"
"fmt"
"io"
"os"
"reflect"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"gomodules.xyz/cert"
)
func NewCmdGetCACert() *cobra.Command {
var cn string
cmd := &cobra.Command{
Use: "ca-cert",
Short: "Prints self-signed CA certificate from PEM encoded RSA private key",
DisableAutoGenTag: true,
Run: func(cmd *cobra.Command, args []string) {
reader := bufio.NewReader(os.Stdin)
keyBytes, err := io.ReadAll(reader)
if err != nil {
Fatal(errors.Wrap(err, "failed to read private key"))
}
key, err := cert.ParsePrivateKeyPEM(keyBytes)
if err != nil {
Fatal(errors.Wrap(err, "failed to parse private key"))
}
rsaKey, ok := key.(*rsa.PrivateKey)
if !ok {
Fatal(errors.Wrapf(err, "only supports rsa private key. Found %v", reflect.ValueOf(key).Kind()))
}
crt, err := cert.NewSelfSignedCACert(cert.Config{
CommonName: cn,
AltNames: cert.AltNames{
DNSNames: []string{cn},
},
}, rsaKey)
if err != nil {
Fatal(errors.Wrap(err, "failed to generate self-signed certificate"))
}
fmt.Println(string(cert.EncodeCertPEM(crt)))
os.Exit(0)
},
}
cmd.Flags().StringVar(&cn, "common-name", cn, "Common Name used in CA certificate.")
return cmd
}