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//
// Copyright (c) SAS Institute 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 servecmd
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"os"
"github.com/spf13/cobra"
"github.com/sassoftware/relic/v7/cmdline/shared"
"github.com/sassoftware/relic/v7/lib/certloader"
"github.com/sassoftware/relic/v7/lib/x509tools"
)
var SetupCmd = &cobra.Command{
Use: "setup",
Short: "Generate private key and certificate request for server",
RunE: setupCmd,
}
var (
argRsaBits uint
argEcdsaBits uint
argSelfSign bool
)
func init() {
SetupCmd.Flags().UintVar(&argRsaBits, "generate-rsa", 0, "Generate a RSA key of the specified bit size, if needed")
SetupCmd.Flags().UintVar(&argEcdsaBits, "generate-ecdsa", 0, "Generate an ECDSA key of the specified curve size, if needed")
SetupCmd.Flags().BoolVar(&argSelfSign, "self-sign", false, "Make and store a self-signed certificate instead of a request")
x509tools.AddRequestFlags(SetupCmd)
ServeCmd.AddCommand(SetupCmd)
}
func readKey(path string) (crypto.PrivateKey, error) {
pemData, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return certloader.ParseAnyPrivateKey(pemData, nil)
}
func selectOrGenerate(path string) (crypto.PrivateKey, error) {
key, err := readKey(path)
if err == nil {
fmt.Fprintf(os.Stderr, "Using existing private key at %s\n", path)
return key, nil
} else if !os.IsNotExist(err) {
return nil, fmt.Errorf("reading private key: %w", err)
}
var block *pem.Block
if argRsaBits != 0 {
rsaKey, err := rsa.GenerateKey(rand.Reader, int(argRsaBits))
if err != nil {
return nil, err
}
key = rsaKey
keyBytes := x509.MarshalPKCS1PrivateKey(rsaKey)
block = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: keyBytes}
} else if argEcdsaBits != 0 {
curve, err := x509tools.CurveByBits(argEcdsaBits)
if err != nil {
return nil, err
}
ecKey, err := ecdsa.GenerateKey(curve.Curve, rand.Reader)
if err != nil {
return nil, err
}
key = ecKey
keyBytes, err := x509.MarshalECPrivateKey(ecKey)
if err != nil {
return nil, err
}
block = &pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes}
} else {
return nil, errors.New("No matching key exists, specify --generate-rsa or --generate-ecdsa to generate one")
}
pemData := pem.EncodeToMemory(block)
if err := ioutil.WriteFile(path, pemData, 0600); err != nil {
return nil, fmt.Errorf("writing new private key: %w", err)
}
fmt.Fprintf(os.Stderr, "Wrote new private key to %s\n", path)
return key, nil
}
func setupCmd(cmd *cobra.Command, args []string) error {
if err := shared.InitConfig(); err != nil {
return err
}
if shared.CurrentConfig.Server == nil {
return errors.New("Missing server section in configuration file")
}
if shared.CurrentConfig.Server.KeyFile == "" {
return errors.New("Missing keyfile option in server configuration file")
}
if argSelfSign && shared.CurrentConfig.Server.KeyFile == "" {
return errors.New("Missing certfile option in server configuration file")
}
if x509tools.ArgCommonName == "" {
return errors.New("--commonName is required")
}
if x509tools.ArgDNSNames == "" && x509tools.ArgEmailNames == "" {
fmt.Fprintf(os.Stderr, "Subject alternate names is empty; appending %s\n", x509tools.ArgCommonName)
x509tools.ArgDNSNames = x509tools.ArgCommonName
}
key, err := selectOrGenerate(shared.CurrentConfig.Server.KeyFile)
if err != nil {
return err
}
signer, ok := key.(crypto.Signer)
if !ok {
panic("expected a signer")
}
if argSelfSign {
x509tools.ArgExpireDays = 36525
x509tools.ArgCertAuthority = true
cert, err := x509tools.MakeCertificate(rand.Reader, signer)
if err != nil {
return err
}
err = ioutil.WriteFile(shared.CurrentConfig.Server.CertFile, []byte(cert), 0600)
if err != nil {
return err
}
} else {
req, err := x509tools.MakeRequest(rand.Reader, signer)
if err != nil {
return err
}
os.Stdout.WriteString(req)
}
return nil
}
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