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c533991519
German Federal Office for Information Security requests in its technical guideline BSI TR-02102-1 RSA Keylength not shorter than 3000bits starting 2024, in the year 2023 3000bits as a recommendation. Gitea should request longer RSA Keys by default in favor of security and drop old clients which do not support longer keys. https://www.bsi.bund.de/SharedDocs/Downloads/DE/BSI/Publikationen/TechnischeRichtlinien/TR02102/BSI-TR-02102.pdf?__blob=publicationFile&v=9 - Page 19, Table 1.2 --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
196 lines
4.9 KiB
Go
196 lines
4.9 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2016 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package cmd
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"log"
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"math/big"
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"net"
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"os"
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"strings"
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"time"
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"github.com/urfave/cli/v2"
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)
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// CmdCert represents the available cert sub-command.
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var CmdCert = &cli.Command{
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Name: "cert",
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Usage: "Generate self-signed certificate",
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Description: `Generate a self-signed X.509 certificate for a TLS server.
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Outputs to 'cert.pem' and 'key.pem' and will overwrite existing files.`,
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Action: runCert,
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Flags: []cli.Flag{
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&cli.StringFlag{
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Name: "host",
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Value: "",
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Usage: "Comma-separated hostnames and IPs to generate a certificate for",
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},
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&cli.StringFlag{
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Name: "ecdsa-curve",
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Value: "",
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Usage: "ECDSA curve to use to generate a key. Valid values are P224, P256, P384, P521",
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},
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&cli.IntFlag{
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Name: "rsa-bits",
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Value: 3072,
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Usage: "Size of RSA key to generate. Ignored if --ecdsa-curve is set",
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},
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&cli.StringFlag{
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Name: "start-date",
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Value: "",
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Usage: "Creation date formatted as Jan 1 15:04:05 2011",
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},
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&cli.DurationFlag{
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Name: "duration",
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Value: 365 * 24 * time.Hour,
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Usage: "Duration that certificate is valid for",
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},
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&cli.BoolFlag{
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Name: "ca",
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Usage: "whether this cert should be its own Certificate Authority",
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},
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},
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}
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func publicKey(priv any) any {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &k.PublicKey
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case *ecdsa.PrivateKey:
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return &k.PublicKey
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default:
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return nil
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}
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}
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func pemBlockForKey(priv any) *pem.Block {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
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case *ecdsa.PrivateKey:
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b, err := x509.MarshalECPrivateKey(k)
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if err != nil {
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log.Fatalf("Unable to marshal ECDSA private key: %v", err)
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}
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return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
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default:
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return nil
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}
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}
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func runCert(c *cli.Context) error {
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if err := argsSet(c, "host"); err != nil {
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return err
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}
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var priv any
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var err error
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switch c.String("ecdsa-curve") {
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case "":
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priv, err = rsa.GenerateKey(rand.Reader, c.Int("rsa-bits"))
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case "P224":
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priv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
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case "P256":
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priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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case "P384":
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priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
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case "P521":
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priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
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default:
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log.Fatalf("Unrecognized elliptic curve: %q", c.String("ecdsa-curve"))
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}
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if err != nil {
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log.Fatalf("Failed to generate private key: %v", err)
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}
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var notBefore time.Time
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if startDate := c.String("start-date"); startDate != "" {
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notBefore, err = time.Parse("Jan 2 15:04:05 2006", startDate)
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if err != nil {
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log.Fatalf("Failed to parse creation date: %v", err)
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}
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} else {
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notBefore = time.Now()
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}
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notAfter := notBefore.Add(c.Duration("duration"))
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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log.Fatalf("Failed to generate serial number: %v", err)
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{"Acme Co"},
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CommonName: "Gitea",
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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hosts := strings.Split(c.String("host"), ",")
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for _, h := range hosts {
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if ip := net.ParseIP(h); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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} else {
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template.DNSNames = append(template.DNSNames, h)
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}
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}
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if c.Bool("ca") {
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template.IsCA = true
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template.KeyUsage |= x509.KeyUsageCertSign
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
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if err != nil {
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log.Fatalf("Failed to create certificate: %v", err)
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}
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certOut, err := os.Create("cert.pem")
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if err != nil {
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log.Fatalf("Failed to open cert.pem for writing: %v", err)
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}
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err = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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if err != nil {
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log.Fatalf("Failed to encode certificate: %v", err)
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}
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err = certOut.Close()
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if err != nil {
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log.Fatalf("Failed to write cert: %v", err)
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}
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log.Println("Written cert.pem")
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keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600)
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if err != nil {
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log.Fatalf("Failed to open key.pem for writing: %v", err)
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}
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err = pem.Encode(keyOut, pemBlockForKey(priv))
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if err != nil {
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log.Fatalf("Failed to encode key: %v", err)
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}
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err = keyOut.Close()
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if err != nil {
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log.Fatalf("Failed to write key: %v", err)
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}
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log.Println("Written key.pem")
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return nil
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}
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