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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2016 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package cmd
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"log"
"math/big"
"net"
"os"
"strings"
"time"
"github.com/urfave/cli/v2"
)
// CmdCert represents the available cert sub-command.
var CmdCert = &cli.Command{
Name: "cert",
Usage: "Generate self-signed certificate",
Description: `Generate a self-signed X.509 certificate for a TLS server.
Outputs to 'cert.pem' and 'key.pem' and will overwrite existing files.`,
Action: runCert,
Flags: []cli.Flag{
&cli.StringFlag{
Name: "host",
Value: "",
Usage: "Comma-separated hostnames and IPs to generate a certificate for",
},
&cli.StringFlag{
Name: "ecdsa-curve",
Value: "",
Usage: "ECDSA curve to use to generate a key. Valid values are P224, P256, P384, P521",
},
&cli.IntFlag{
Name: "rsa-bits",
Value: 3072,
Usage: "Size of RSA key to generate. Ignored if --ecdsa-curve is set",
},
&cli.StringFlag{
Name: "start-date",
Value: "",
Usage: "Creation date formatted as Jan 1 15:04:05 2011",
},
&cli.DurationFlag{
Name: "duration",
Value: 365 * 24 * time.Hour,
Usage: "Duration that certificate is valid for",
},
&cli.BoolFlag{
Name: "ca",
Usage: "whether this cert should be its own Certificate Authority",
},
},
}
func publicKey(priv any) any {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}
func pemBlockForKey(priv any) *pem.Block {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
log.Fatalf("Unable to marshal ECDSA private key: %v", err)
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
default:
return nil
}
}
func runCert(c *cli.Context) error {
if err := argsSet(c, "host"); err != nil {
return err
}
var priv any
var err error
switch c.String("ecdsa-curve") {
case "":
priv, err = rsa.GenerateKey(rand.Reader, c.Int("rsa-bits"))
case "P224":
priv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
case "P256":
priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
case "P384":
priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
case "P521":
priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
default:
log.Fatalf("Unrecognized elliptic curve: %q", c.String("ecdsa-curve"))
}
if err != nil {
log.Fatalf("Failed to generate private key: %v", err)
}
var notBefore time.Time
if startDate := c.String("start-date"); startDate != "" {
notBefore, err = time.Parse("Jan 2 15:04:05 2006", startDate)
if err != nil {
log.Fatalf("Failed to parse creation date: %v", err)
}
} else {
notBefore = time.Now()
}
notAfter := notBefore.Add(c.Duration("duration"))
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
log.Fatalf("Failed to generate serial number: %v", err)
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Acme Co"},
CommonName: "Gitea",
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
hosts := strings.Split(c.String("host"), ",")
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
if c.Bool("ca") {
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
log.Fatalf("Failed to create certificate: %v", err)
}
certOut, err := os.Create("cert.pem")
if err != nil {
log.Fatalf("Failed to open cert.pem for writing: %v", err)
}
err = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
if err != nil {
log.Fatalf("Failed to encode certificate: %v", err)
}
err = certOut.Close()
if err != nil {
log.Fatalf("Failed to write cert: %v", err)
}
log.Println("Written cert.pem")
keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600)
if err != nil {
log.Fatalf("Failed to open key.pem for writing: %v", err)
}
err = pem.Encode(keyOut, pemBlockForKey(priv))
if err != nil {
log.Fatalf("Failed to encode key: %v", err)
}
err = keyOut.Close()
if err != nil {
log.Fatalf("Failed to write key: %v", err)
}
log.Println("Written key.pem")
return nil
}
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