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-rw-r--r--cmd/cert.go196
1 files changed, 196 insertions, 0 deletions
diff --git a/cmd/cert.go b/cmd/cert.go
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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: "Forgejo",
+ },
+ 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
+}