/
security.go
489 lines (393 loc) · 10.9 KB
/
security.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
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
package common
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/pem"
"flag"
"fmt"
"github.com/grantae/certinfo"
"io/ioutil"
"math/big"
"net"
"software.sslmate.com/src/go-pkcs12"
"strings"
"sync"
"time"
)
type TlsPackage struct {
CertificateAsPem, PrivateKeyAsPem []byte
Certificate *x509.Certificate
PrivateKey interface{}
CaCerts []*x509.Certificate
P12 []byte
Info string
Config tls.Config
}
var (
FlagTlsP12File *string
FlagTlsP12 *string
muTLS sync.Mutex
)
const (
FlagNameTlsP12File = "tls.p12file"
FlagNameTlsP12 = "tls.p12"
)
func init() {
FlagTlsP12File = flag.String(FlagNameTlsP12File, "", "TLS PKCS12 certificates & privkey container file (P12 format)")
FlagTlsP12 = flag.String(FlagNameTlsP12, "", "TLS PKCS12 certificates & privkey container stream (P12,Base64 format)")
}
func Rnd(max int) int {
nBig, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
if err != nil {
panic(err)
}
return int(nBig.Int64())
}
// GenerateRandomBytes returns securely generated random bytes.
// It will return an error if the system's secure random
// number generator fails to function correctly, in which
// case the caller should not continue.
func GenerateRandomBytes(n int) ([]byte, error) {
DebugFunc()
b := make([]byte, n)
_, err := rand.Read(b)
// Note that err == nil only if we read len(b) bytes.
if err != nil {
return nil, err
}
return b, nil
}
// GenerateRandomString returns a URL-safe, base64 encoded
// securely generated random string.
func GenerateRandomString(s int) (string, error) {
DebugFunc()
b, err := GenerateRandomBytes(s)
return base64.URLEncoding.EncodeToString(b), err
}
// the priority on entities inside p12 must be honored
// 1st private key
// 2nd computer certificate
// 3d..n CA certificates (will be ignored by app)
func TLSConfigFromP12File(p12File string) (*TlsPackage, error) {
DebugFunc("p12File: %s", p12File)
ok, err := FileExists(p12File)
if Error(err) || !ok {
return nil, err
}
ba, err := ioutil.ReadFile(p12File)
if Error(err) || !ok {
return nil, err
}
return TlsConfigFromP12Buffer(ba)
}
func TlsConfigFromP12Buffer(ba []byte) (*TlsPackage, error) {
DebugFunc()
_, _, err := VerifyP12(ba, pkcs12.DefaultPassword)
if Error(err) {
return nil, err
}
key, cert, caCerts, err := pkcs12.DecodeChain(ba, pkcs12.DefaultPassword)
if Error(err) {
return nil, err
}
_, ok := key.(*rsa.PrivateKey)
if !ok {
return nil, fmt.Errorf("Expected RSA private key type")
}
keyAsPem := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key.(*rsa.PrivateKey)),
},
)
certAsPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: cert.Raw})
caCertPool, _ := x509.SystemCertPool()
if caCertPool == nil {
caCertPool = x509.NewCertPool()
}
caCertPool.AppendCertsFromPEM(certAsPem)
certificate, err := tls.X509KeyPair([]byte(certAsPem), []byte(keyAsPem))
if Error(err) {
return nil, err
}
tlsConfig := tls.Config{
Rand: rand.Reader,
PreferServerCipherSuites: true,
Certificates: []tls.Certificate{certificate},
RootCAs: caCertPool,
ClientCAs: caCertPool,
CurvePreferences: []tls.CurveID{
tls.CurveP521,
tls.CurveP384,
tls.CurveP256,
},
}
list := []*x509.Certificate{cert}
list = append(list, caCerts...)
certInfos, err := CertificateInfoFromX509(list)
if Error(err) {
return nil, err
}
return &TlsPackage{
CertificateAsPem: certAsPem,
PrivateKeyAsPem: keyAsPem,
Certificate: cert,
PrivateKey: key,
P12: ba,
CaCerts: caCerts,
Info: certInfos,
Config: tlsConfig,
}, nil
}
func TLSConfigFromPem(certAsPem []byte, keyAsPem []byte) (*TlsPackage, error) {
DebugFunc("generate TLS config from given cert and key flags")
certBytes, _ := pem.Decode(certAsPem)
if certBytes == nil {
return nil, fmt.Errorf("cannot find PEM block with certificate")
}
keyBytes, _ := pem.Decode(keyAsPem)
if keyBytes == nil {
return nil, fmt.Errorf("cannot find PEM block with key")
}
cert, err := x509.ParseCertificate(certBytes.Bytes)
if err != nil {
panic("failed to parse certificate: " + err.Error())
}
priv, err := x509.ParsePKCS1PrivateKey(keyBytes.Bytes)
if err != nil {
return nil, err
}
p12, err := pkcs12.Encode(rand.Reader, priv, cert, nil, pkcs12.DefaultPassword)
if Error(err) {
return nil, err
}
return TlsConfigFromP12Buffer(p12)
}
func createCertificateTemplate() (*x509.Certificate, error) {
DebugFunc()
_, hostname, err := GetHost()
if Error(err) {
return nil, err
}
// generate a random serial number (a real cert authority would have some logic behind this)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if Error(err) {
return nil, err
}
tmpl := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
CommonName: hostname,
Organization: []string{TitleVersion(true, true, true)}},
SignatureAlgorithm: x509.SHA256WithRSA,
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Duration(10) * 365 * 24 * time.Hour),
DNSNames: []string{hostname, "localhost"},
BasicConstraintsValid: true,
}
return &tmpl, nil
}
func createCertificate(template, parent *x509.Certificate, pub interface{}, parentPriv interface{}) (cert *x509.Certificate, certPEM []byte, err error) {
DebugFunc()
certDER, err := x509.CreateCertificate(rand.Reader, template, parent, pub, parentPriv)
if err != nil {
return
}
// parse the resulting certificate so we can use it again
cert, err = x509.ParseCertificate(certDER)
if err != nil {
return
}
// PEM encode the certificate (this is a standard TLS encoding)
b := pem.Block{Type: "CERTIFICATE", Bytes: certDER}
certPEM = pem.EncodeToMemory(&b)
return
}
func CreateTlsPackage() (*TlsPackage, error) {
DebugFunc()
key, err := rsa.GenerateKey(rand.Reader, 2048)
if Error(err) {
return nil, err
}
certTmpl, err := createCertificateTemplate()
if Error(err) {
return nil, err
}
addrs, err := GetActiveAddrs(true)
if Error(err) {
return nil, err
}
parsedIps := make([]net.IP, 0)
for _, addr := range addrs {
ip, _, err := net.ParseCIDR(addr.String())
if Error(err) {
return nil, err
}
parsedIps = append(parsedIps, ip)
}
certTmpl.IsCA = true
certTmpl.KeyUsage = x509.KeyUsageKeyEncipherment | x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature
certTmpl.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth}
certTmpl.IPAddresses = parsedIps
_, certPEM, err := createCertificate(certTmpl, certTmpl, &key.PublicKey, key)
if Error(err) {
return nil, err
}
keyPEM := pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key),
})
return TLSConfigFromPem(certPEM, keyPEM)
}
func GetTlsPackage() (*TlsPackage, error) {
DebugFunc()
muTLS.Lock()
defer muTLS.Unlock()
var tlsPackage *TlsPackage
if *FlagTlsP12File != "" {
tlsPackage, _ = TLSConfigFromP12File(*FlagTlsP12File)
if tlsPackage != nil {
return tlsPackage, nil
}
}
cfg := GetConfiguration()
if cfg != nil {
p12, _ := cfg.GetFlag(FlagNameTlsP12)
if p12 != "" {
ba, _ := base64.StdEncoding.DecodeString(p12)
if ba != nil {
tlsPackage, _ = TlsConfigFromP12Buffer(ba)
if tlsPackage != nil {
return tlsPackage, nil
}
}
}
}
tlsPackage, err := CreateTlsPackage()
if Error(err) {
return nil, err
}
return tlsPackage, nil
}
func VerifyP12(p12 []byte, password string) (*x509.Certificate, *rsa.PrivateKey, error) {
privateKey, cert, err := pkcs12.Decode(p12, password)
if err != nil {
return nil, nil, err
}
err = VerifyCertificate(cert)
if Error(err) {
return nil, nil, err
}
priv, ok := privateKey.(*rsa.PrivateKey)
if !ok {
return nil, nil, fmt.Errorf("Expected RSA private key type")
}
return cert, priv, nil
}
func VerifyCertificate(cert *x509.Certificate) error {
DebugFunc()
var err error
if !IsCertificateSelfSigned(cert) {
_, err = cert.Verify(x509.VerifyOptions{})
}
if err == nil {
now := time.Now()
if now.Before(cert.NotBefore) || now.After(cert.NotAfter) {
err = fmt.Errorf("Certificate is not valid (NotBefore: %v, NotAfter: %v)", cert.NotBefore, cert.NotAfter)
}
}
return err
}
func CertificateInfoFromConnection(con *tls.Conn) (string, error) {
DebugFunc()
txt := ""
for i, cert := range con.ConnectionState().PeerCertificates {
header := fmt.Sprintf("#%d ", i)
info := fmt.Sprintf("%s%s\n", header, strings.Repeat("-", 100-len(header)))
certInfo, err := certinfo.CertificateText(cert)
if Error(err) {
continue
}
info += fmt.Sprintf("%s\n", certInfo)
txt += info
}
return txt, nil
}
func CertificateInfoFromX509(certs []*x509.Certificate) (string, error) {
DebugFunc()
txt := ""
for i, cert := range certs {
var header string
if i == 0 {
header = Translate("Certificate")
} else {
header = fmt.Sprintf("%s #%d ", Translate("CA Certificate"), i-1)
}
info := fmt.Sprintf("%s %s\n", header, strings.Repeat("-", 60-len(header)))
certInfo, err := certinfo.CertificateText(cert)
if Error(err) {
continue
}
info += fmt.Sprintf("%s\n", certInfo)
txt += info
}
return txt, nil
}
func ExportRsaPrivateKeyAsPemStr(privkey *rsa.PrivateKey) string {
privkey_bytes := x509.MarshalPKCS1PrivateKey(privkey)
privkey_pem := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: privkey_bytes,
},
)
return string(privkey_pem)
}
func ParseRsaPrivateKeyFromPemStr(privPEM string) (*rsa.PrivateKey, error) {
block, _ := pem.Decode([]byte(privPEM))
if block == nil {
return nil, fmt.Errorf("failed to parse PEM block containing the key")
}
priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return priv, nil
}
func ExportRsaPublicKeyAsPemStr(pubkey *rsa.PublicKey) (string, error) {
pubkey_bytes, err := x509.MarshalPKIXPublicKey(pubkey)
if err != nil {
return "", err
}
pubkey_pem := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PUBLIC KEY",
Bytes: pubkey_bytes,
},
)
return string(pubkey_pem), nil
}
func ParseRsaPublicKeyFromPemStr(pubPEM string) (*rsa.PublicKey, error) {
block, _ := pem.Decode([]byte(pubPEM))
if block == nil {
return nil, fmt.Errorf("failed to parse PEM block containing the key")
}
pub, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, err
}
switch pub := pub.(type) {
case *rsa.PublicKey:
return pub, nil
default:
break // fall through
}
return nil, fmt.Errorf("Key type is not RSA")
}
func IsCertificateSelfSigned(cert *x509.Certificate) bool {
return cert.Issuer.String() == cert.Subject.String()
}