-
-
Notifications
You must be signed in to change notification settings - Fork 2.7k
/
cert.go
368 lines (309 loc) · 11.3 KB
/
cert.go
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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
// Copyright 2018 The mkcert Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/pem"
"io/ioutil"
"log"
"math/big"
"net"
"net/mail"
"net/url"
"os"
"os/user"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
pkcs12 "software.sslmate.com/src/go-pkcs12"
)
var userAndHostname string
func init() {
u, err := user.Current()
if err == nil {
userAndHostname = u.Username + "@"
}
if h, err := os.Hostname(); err == nil {
userAndHostname += h
}
if err == nil && u.Name != "" && u.Name != u.Username {
userAndHostname += " (" + u.Name + ")"
}
}
func (m *mkcert) makeCert(hosts []string) {
if m.caKey == nil {
log.Fatalln("ERROR: can't create new certificates because the CA key (rootCA-key.pem) is missing")
}
priv, err := m.generateKey(false)
fatalIfErr(err, "failed to generate certificate key")
pub := priv.(crypto.Signer).Public()
// Certificates last for 2 years and 3 months, which is always less than
// 825 days, the limit that macOS/iOS apply to all certificates,
// including custom roots. See https://support.apple.com/en-us/HT210176.
expiration := time.Now().AddDate(2, 3, 0)
tpl := &x509.Certificate{
SerialNumber: randomSerialNumber(),
Subject: pkix.Name{
Organization: []string{"mkcert development certificate"},
OrganizationalUnit: []string{userAndHostname},
},
NotBefore: time.Now(), NotAfter: expiration,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
}
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
tpl.IPAddresses = append(tpl.IPAddresses, ip)
} else if email, err := mail.ParseAddress(h); err == nil && email.Address == h {
tpl.EmailAddresses = append(tpl.EmailAddresses, h)
} else if uriName, err := url.Parse(h); err == nil && uriName.Scheme != "" && uriName.Host != "" {
tpl.URIs = append(tpl.URIs, uriName)
} else {
tpl.DNSNames = append(tpl.DNSNames, h)
}
}
if m.client {
tpl.ExtKeyUsage = append(tpl.ExtKeyUsage, x509.ExtKeyUsageClientAuth)
}
if len(tpl.IPAddresses) > 0 || len(tpl.DNSNames) > 0 || len(tpl.URIs) > 0 {
tpl.ExtKeyUsage = append(tpl.ExtKeyUsage, x509.ExtKeyUsageServerAuth)
}
if len(tpl.EmailAddresses) > 0 {
tpl.ExtKeyUsage = append(tpl.ExtKeyUsage, x509.ExtKeyUsageEmailProtection)
}
// IIS (the main target of PKCS #12 files), only shows the deprecated
// Common Name in the UI. See issue #115.
if m.pkcs12 {
tpl.Subject.CommonName = hosts[0]
}
cert, err := x509.CreateCertificate(rand.Reader, tpl, m.caCert, pub, m.caKey)
fatalIfErr(err, "failed to generate certificate")
certFile, keyFile, p12File := m.fileNames(hosts)
if !m.pkcs12 {
certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: cert})
privDER, err := x509.MarshalPKCS8PrivateKey(priv)
fatalIfErr(err, "failed to encode certificate key")
privPEM := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privDER})
if certFile == keyFile {
err = ioutil.WriteFile(keyFile, append(certPEM, privPEM...), 0600)
fatalIfErr(err, "failed to save certificate and key")
} else {
err = ioutil.WriteFile(certFile, certPEM, 0644)
fatalIfErr(err, "failed to save certificate")
err = ioutil.WriteFile(keyFile, privPEM, 0600)
fatalIfErr(err, "failed to save certificate key")
}
} else {
domainCert, _ := x509.ParseCertificate(cert)
pfxData, err := pkcs12.Encode(rand.Reader, priv, domainCert, []*x509.Certificate{m.caCert}, "changeit")
fatalIfErr(err, "failed to generate PKCS#12")
err = ioutil.WriteFile(p12File, pfxData, 0644)
fatalIfErr(err, "failed to save PKCS#12")
}
m.printHosts(hosts)
if !m.pkcs12 {
if certFile == keyFile {
log.Printf("\nThe certificate and key are at \"%s\" ✅\n\n", certFile)
} else {
log.Printf("\nThe certificate is at \"%s\" and the key at \"%s\" ✅\n\n", certFile, keyFile)
}
} else {
log.Printf("\nThe PKCS#12 bundle is at \"%s\" ✅\n", p12File)
log.Printf("\nThe legacy PKCS#12 encryption password is the often hardcoded default \"changeit\" ℹ️\n\n")
}
log.Printf("It will expire on %s 🗓\n\n", expiration.Format("2 January 2006"))
}
func (m *mkcert) printHosts(hosts []string) {
secondLvlWildcardRegexp := regexp.MustCompile(`(?i)^\*\.[0-9a-z_-]+$`)
log.Printf("\nCreated a new certificate valid for the following names 📜")
for _, h := range hosts {
log.Printf(" - %q", h)
if secondLvlWildcardRegexp.MatchString(h) {
log.Printf(" Warning: many browsers don't support second-level wildcards like %q ⚠️", h)
}
}
for _, h := range hosts {
if strings.HasPrefix(h, "*.") {
log.Printf("\nReminder: X.509 wildcards only go one level deep, so this won't match a.b.%s ℹ️", h[2:])
break
}
}
}
func (m *mkcert) generateKey(rootCA bool) (crypto.PrivateKey, error) {
if m.ecdsa {
return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
}
if rootCA {
return rsa.GenerateKey(rand.Reader, 3072)
}
return rsa.GenerateKey(rand.Reader, 2048)
}
func (m *mkcert) fileNames(hosts []string) (certFile, keyFile, p12File string) {
defaultName := strings.Replace(hosts[0], ":", "_", -1)
defaultName = strings.Replace(defaultName, "*", "_wildcard", -1)
if len(hosts) > 1 {
defaultName += "+" + strconv.Itoa(len(hosts)-1)
}
if m.client {
defaultName += "-client"
}
certFile = "./" + defaultName + ".pem"
if m.certFile != "" {
certFile = m.certFile
}
keyFile = "./" + defaultName + "-key.pem"
if m.keyFile != "" {
keyFile = m.keyFile
}
p12File = "./" + defaultName + ".p12"
if m.p12File != "" {
p12File = m.p12File
}
return
}
func randomSerialNumber() *big.Int {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
fatalIfErr(err, "failed to generate serial number")
return serialNumber
}
func (m *mkcert) makeCertFromCSR() {
if m.caKey == nil {
log.Fatalln("ERROR: can't create new certificates because the CA key (rootCA-key.pem) is missing")
}
csrPEMBytes, err := ioutil.ReadFile(m.csrPath)
fatalIfErr(err, "failed to read the CSR")
csrPEM, _ := pem.Decode(csrPEMBytes)
if csrPEM == nil {
log.Fatalln("ERROR: failed to read the CSR: unexpected content")
}
if csrPEM.Type != "CERTIFICATE REQUEST" &&
csrPEM.Type != "NEW CERTIFICATE REQUEST" {
log.Fatalln("ERROR: failed to read the CSR: expected CERTIFICATE REQUEST, got " + csrPEM.Type)
}
csr, err := x509.ParseCertificateRequest(csrPEM.Bytes)
fatalIfErr(err, "failed to parse the CSR")
fatalIfErr(csr.CheckSignature(), "invalid CSR signature")
expiration := time.Now().AddDate(2, 3, 0)
tpl := &x509.Certificate{
SerialNumber: randomSerialNumber(),
Subject: csr.Subject,
ExtraExtensions: csr.Extensions, // includes requested SANs, KUs and EKUs
NotBefore: time.Now(), NotAfter: expiration,
// If the CSR does not request a SAN extension, fix it up for them as
// the Common Name field does not work in modern browsers. Otherwise,
// this will get overridden.
DNSNames: []string{csr.Subject.CommonName},
// Likewise, if the CSR does not set KUs and EKUs, fix it up as Apple
// platforms require serverAuth for TLS.
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
}
if m.client {
tpl.ExtKeyUsage = append(tpl.ExtKeyUsage, x509.ExtKeyUsageClientAuth)
}
if len(csr.EmailAddresses) > 0 {
tpl.ExtKeyUsage = append(tpl.ExtKeyUsage, x509.ExtKeyUsageEmailProtection)
}
cert, err := x509.CreateCertificate(rand.Reader, tpl, m.caCert, csr.PublicKey, m.caKey)
fatalIfErr(err, "failed to generate certificate")
c, err := x509.ParseCertificate(cert)
fatalIfErr(err, "failed to parse generated certificate")
var hosts []string
hosts = append(hosts, c.DNSNames...)
hosts = append(hosts, c.EmailAddresses...)
for _, ip := range c.IPAddresses {
hosts = append(hosts, ip.String())
}
for _, uri := range c.URIs {
hosts = append(hosts, uri.String())
}
certFile, _, _ := m.fileNames(hosts)
err = ioutil.WriteFile(certFile, pem.EncodeToMemory(
&pem.Block{Type: "CERTIFICATE", Bytes: cert}), 0644)
fatalIfErr(err, "failed to save certificate")
m.printHosts(hosts)
log.Printf("\nThe certificate is at \"%s\" ✅\n\n", certFile)
log.Printf("It will expire on %s 🗓\n\n", expiration.Format("2 January 2006"))
}
// loadCA will load or create the CA at CAROOT.
func (m *mkcert) loadCA() {
if !pathExists(filepath.Join(m.CAROOT, rootName)) {
m.newCA()
}
certPEMBlock, err := ioutil.ReadFile(filepath.Join(m.CAROOT, rootName))
fatalIfErr(err, "failed to read the CA certificate")
certDERBlock, _ := pem.Decode(certPEMBlock)
if certDERBlock == nil || certDERBlock.Type != "CERTIFICATE" {
log.Fatalln("ERROR: failed to read the CA certificate: unexpected content")
}
m.caCert, err = x509.ParseCertificate(certDERBlock.Bytes)
fatalIfErr(err, "failed to parse the CA certificate")
if !pathExists(filepath.Join(m.CAROOT, rootKeyName)) {
return // keyless mode, where only -install works
}
keyPEMBlock, err := ioutil.ReadFile(filepath.Join(m.CAROOT, rootKeyName))
fatalIfErr(err, "failed to read the CA key")
keyDERBlock, _ := pem.Decode(keyPEMBlock)
if keyDERBlock == nil || keyDERBlock.Type != "PRIVATE KEY" {
log.Fatalln("ERROR: failed to read the CA key: unexpected content")
}
m.caKey, err = x509.ParsePKCS8PrivateKey(keyDERBlock.Bytes)
fatalIfErr(err, "failed to parse the CA key")
}
func (m *mkcert) newCA() {
priv, err := m.generateKey(true)
fatalIfErr(err, "failed to generate the CA key")
pub := priv.(crypto.Signer).Public()
spkiASN1, err := x509.MarshalPKIXPublicKey(pub)
fatalIfErr(err, "failed to encode public key")
var spki struct {
Algorithm pkix.AlgorithmIdentifier
SubjectPublicKey asn1.BitString
}
_, err = asn1.Unmarshal(spkiASN1, &spki)
fatalIfErr(err, "failed to decode public key")
skid := sha1.Sum(spki.SubjectPublicKey.Bytes)
tpl := &x509.Certificate{
SerialNumber: randomSerialNumber(),
Subject: pkix.Name{
Organization: []string{"mkcert development CA"},
OrganizationalUnit: []string{userAndHostname},
// The CommonName is required by iOS to show the certificate in the
// "Certificate Trust Settings" menu.
// https://github.com/FiloSottile/mkcert/issues/47
CommonName: "mkcert " + userAndHostname,
},
SubjectKeyId: skid[:],
NotAfter: time.Now().AddDate(10, 0, 0),
NotBefore: time.Now(),
KeyUsage: x509.KeyUsageCertSign,
BasicConstraintsValid: true,
IsCA: true,
MaxPathLenZero: true,
}
cert, err := x509.CreateCertificate(rand.Reader, tpl, tpl, pub, priv)
fatalIfErr(err, "failed to generate CA certificate")
privDER, err := x509.MarshalPKCS8PrivateKey(priv)
fatalIfErr(err, "failed to encode CA key")
err = ioutil.WriteFile(filepath.Join(m.CAROOT, rootKeyName), pem.EncodeToMemory(
&pem.Block{Type: "PRIVATE KEY", Bytes: privDER}), 0400)
fatalIfErr(err, "failed to save CA key")
err = ioutil.WriteFile(filepath.Join(m.CAROOT, rootName), pem.EncodeToMemory(
&pem.Block{Type: "CERTIFICATE", Bytes: cert}), 0644)
fatalIfErr(err, "failed to save CA certificate")
log.Printf("Created a new local CA 💥\n")
}
func (m *mkcert) caUniqueName() string {
return "mkcert development CA " + m.caCert.SerialNumber.String()
}