1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
// 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 (
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"log"
"math/big"
"net"
"os"
"strings"
"time"
"github.com/urfave/cli/v3"
)
// cmdCert represents the available cert sub-command.
func cmdCert() *cli.Command {
return &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",
Usage: "Comma-separated hostnames and IPs to generate a certificate for",
Required: true,
},
&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",
},
&cli.StringFlag{
Name: "out",
Value: "cert.pem",
Usage: "Path to the file where there certificate will be saved",
},
&cli.StringFlag{
Name: "keyout",
Value: "key.pem",
Usage: "Path to the file where there certificate key will be saved",
},
},
}
}
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(_ context.Context, c *cli.Command) error {
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:
err = fmt.Errorf("unrecognized elliptic curve: %q", c.String("ecdsa-curve"))
}
if err != nil {
return fmt.Errorf("failed to generate private key: %w", 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 {
return fmt.Errorf("failed to parse creation date %w", 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 {
return fmt.Errorf("failed to generate serial number: %w", 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.SplitSeq(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 {
return fmt.Errorf("failed to create certificate: %w", err)
}
certOut, err := os.Create(c.String("out"))
if err != nil {
return fmt.Errorf("failed to open %s for writing: %w", c.String("keyout"), err)
}
err = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
if err != nil {
return fmt.Errorf("failed to encode certificate: %w", err)
}
err = certOut.Close()
if err != nil {
return fmt.Errorf("failed to write cert: %w", err)
}
fmt.Fprintf(c.Writer, "Written cert to %s\n", c.String("out"))
keyOut, err := os.OpenFile(c.String("keyout"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600)
if err != nil {
return fmt.Errorf("failed to open %s for writing: %w", c.String("keyout"), err)
}
err = pem.Encode(keyOut, pemBlockForKey(priv))
if err != nil {
return fmt.Errorf("failed to encode key: %w", err)
}
err = keyOut.Close()
if err != nil {
return fmt.Errorf("failed to write key: %w", err)
}
fmt.Fprintf(c.Writer, "Written key to %s\n", c.String("keyout"))
return nil
}
|
