-
Notifications
You must be signed in to change notification settings - Fork 275
/
zts-svccert.go
521 lines (469 loc) · 16.1 KB
/
zts-svccert.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
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
package main
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"errors"
"flag"
"fmt"
"github.com/AthenZ/athenz/libs/go/athenzutils"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
"strings"
"time"
"github.com/AthenZ/athenz/clients/go/zts"
"github.com/AthenZ/athenz/libs/go/zmssvctoken"
)
type signer struct {
key crypto.Signer
algorithm x509.SignatureAlgorithm
}
var (
// VERSION gets set by the build script via the LDFLAGS.
VERSION string
// BUILD_DATE gets set by the build script via the LDFLAGS.
BUILD_DATE string
)
func printVersion() {
if VERSION == "" {
fmt.Println("zts-svccert (development version)")
} else {
fmt.Println("zts-svccert " + VERSION + " " + BUILD_DATE)
}
}
func usage() {
fmt.Println("")
fmt.Println("Request Instance Register Token Only:")
fmt.Println("")
fmt.Println(" zts-svccert -get-instance-register-token -zts <zts-server-url> <principal-credentials> -provider <provider-name> <service-details> -instance <instance-id> [attestation-data <token-output-file>]")
fmt.Println("")
fmt.Println("Request Service Identity Certificate using Instance Register Token:")
fmt.Println("")
fmt.Println(" zts-svccert -use-instance-register-token -zts <zts-server-url> <principal-credentials> -private-key <private-key-path> -provider <provider-name> <service-details> -instance <instance-id> <certificate-details>")
fmt.Println("")
fmt.Println("Request Service Identity Certificate using Registered Public/Private Key Pair:")
fmt.Println("")
fmt.Println(" zts-svccert -zts <zts-server-url> -private-key <private-key-path> -key-version <private-key-version> -hdr <credential-header-name> [-provider <provider-name>[ <service-details> [-instance <instance-id>] <certificate-details>")
fmt.Println("")
fmt.Println("Request Service Identity Certificate Signing Request (CSR) Only:")
fmt.Println("")
fmt.Println(" zts-svccert -csr -private-key <private-key-path> [-provider <provider-name>] <service-details> [-instance <instance-id>] <certificate-details>")
fmt.Println("")
fmt.Println("Request Service Identity Certificate using Provided Attestation Data:")
fmt.Println("")
fmt.Println(" zts-svccert -private-key <private-key-path> -attestation-data <attestation-data-file> [-hdr <credential-header-name>] [-provider <provider-name>] <service-details> [-instance <instance-id>] <certificate-details>")
fmt.Println("")
fmt.Println("Common parameters:")
fmt.Println("")
fmt.Println(" <service-details> := -domain <domain-name> -service <service-name>")
fmt.Println("")
fmt.Println(" <certificate-details> := -dns-domain <san-dns-domain-component> [-signer-cert-file <cert-output-file>] [-spiffe] [-expiry-time <mins>] [-sub-c <subject country>] [-sub-o <subject org] [-sub-ou <subject orgunit] [-ip <san-ip-address>] [-signer-cert-file <root-ca-output-file>]")
fmt.Println("")
fmt.Println(" <principal-credentials> := -svc-key-file <private-key-file> -svc-cert-file <service-cert-file> [-cacert <ca-cert-file>] |")
fmt.Println(" -ntoken-file <ntoken-file> [-hdr <auth-header-name>] [-cacert <ca-cert-file>]")
fmt.Println("")
os.Exit(1)
}
func main() {
var ztsURL, serviceKey, serviceCert, domain, service, keyID string
var caCertFile, certFile, signerCertFile, dnsDomain, hdr, ip string
var subjC, subjO, subjOU, uri, provider, instance, instanceId string
var svcKeyFile, svcCertFile, ntokenFile, attestationDataFile string
var csr, spiffe, showVersion, getInstanceRegisterToken, useInstanceRegisterToken bool
var expiryTime int
flag.BoolVar(&csr, "csr", false, "request csr only")
flag.BoolVar(&getInstanceRegisterToken, "get-instance-register-token", false, "request instance register token only")
flag.BoolVar(&useInstanceRegisterToken, "use-instance-register-token", false, "request certificate using instance register token")
flag.BoolVar(&spiffe, "spiffe", true, "include spiffe uri in csr")
flag.IntVar(&expiryTime, "expiry-time", 0, "expiry time in minutes")
flag.StringVar(&certFile, "cert-file", "", "output certificate file")
flag.StringVar(&ntokenFile, "ntoken-file", "", "service identity token file")
flag.StringVar(&signerCertFile, "signer-cert-file", "", "output signer certificate file")
flag.StringVar(&caCertFile, "cacert", "", "CA certificate file")
flag.StringVar(&serviceKey, "private-key", "", "private key file (required)")
flag.StringVar(&serviceCert, "service-cert", "", "service certificate file")
flag.StringVar(&domain, "domain", "", "domain of service (required)")
flag.StringVar(&service, "service", "", "name of service (required)")
flag.StringVar(&keyID, "key-version", "", "key version")
flag.StringVar(&ztsURL, "zts", "", "url of the ZTS Service")
flag.StringVar(&dnsDomain, "dns-domain", "", "dns domain suffix to be included in the csr (required)")
flag.StringVar(&hdr, "hdr", "Athenz-Principal-Auth", "Header name")
flag.StringVar(&subjC, "subj-c", "US", "Subject C/Country field")
flag.StringVar(&subjO, "subj-o", "Oath Inc.", "Subject O/Organization field")
flag.StringVar(&subjOU, "subj-ou", "Athenz", "Subject OU/OrganizationalUnit field")
flag.StringVar(&ip, "ip", "", "IP address")
flag.StringVar(&provider, "provider", "", "Athenz Provider")
flag.StringVar(&instance, "instance", "", "Instance Id")
flag.StringVar(&attestationDataFile, "attestation-data", "", "Attestation Data File")
flag.StringVar(&svcKeyFile, "svc-key-file", "", "service identity private key file")
flag.StringVar(&svcCertFile, "svc-cert-file", "", "service identity certificate file")
flag.BoolVar(&showVersion, "version", false, "Show version")
flag.Parse()
if showVersion {
printVersion()
return
}
// if we're asked to obtain instance register token then we can handle
// that separately and return right away
attestationData := ""
var err error
if getInstanceRegisterToken || useInstanceRegisterToken {
if ztsURL == "" || domain == "" || service == "" || provider == "" || instance == "" || svcKeyFile == "" || svcCertFile == "" {
log.Println("Error: missing required attributes. Run with -help for command line arguments")
usage()
}
attestationData, err = fetchInstanceRegisterToken(ztsURL, svcKeyFile, svcCertFile, caCertFile, ntokenFile, hdr, provider, domain, service, instance)
if err != nil {
log.Fatalln(err)
}
if getInstanceRegisterToken {
if attestationDataFile != "" {
err := ioutil.WriteFile(attestationDataFile, []byte(attestationData), 0444)
if err != nil {
log.Fatalln(err)
}
} else {
fmt.Println(attestationData)
}
return
}
}
if serviceKey == "" || domain == "" || service == "" || dnsDomain == "" {
log.Println("Error: missing required attributes. Run with -help for command line arguments")
usage()
}
// load private key
keyBytes, err := ioutil.ReadFile(serviceKey)
if err != nil {
if useInstanceRegisterToken {
keyBytes, err = generatePrivateKey(serviceKey)
}
if err != nil {
log.Fatalln(err)
}
}
// get our private key signer for csr
pkSigner, err := newSigner(keyBytes)
if err != nil {
log.Fatalln(err)
}
// generate a csr for this service
// note: RFC 6125 states that if the SAN (Subject Alternative Name) exists,
// it is used, not the CA. So, we will always put the Athenz name in the CN
// (it is *not* a DNS domain name), and put the host name into the SAN.
hyphenDomain := strings.Replace(domain, ".", "-", -1)
host := fmt.Sprintf("%s.%s.%s", service, hyphenDomain, dnsDomain)
commonName := fmt.Sprintf("%s.%s", domain, service)
if instance != "" {
uriProvider := "zts"
if provider != "" {
uriProvider = provider
}
instanceId = fmt.Sprintf("athenz://instanceid/%s/%s", uriProvider, instance)
}
if spiffe {
uri = fmt.Sprintf("spiffe://%s/sa/%s", domain, service)
}
subj := pkix.Name{
CommonName: commonName,
OrganizationalUnit: []string{subjOU},
Organization: []string{subjO},
Country: []string{subjC},
}
csrData, err := generateCSR(pkSigner, subj, host, instanceId, ip, uri)
if err != nil {
log.Fatalln(err)
}
// if we're provided the csr flag then we're going to display
// it and return right away
if csr {
fmt.Println(csrData)
return
}
// for all other operations we need to have ZTS Server url
if ztsURL == "" {
log.Println("Error: missing ZTS Server url. Run with -help for command line arguments")
usage()
}
// if we're given a certificate then we'll use that otherwise
// we're going to generate a ntoken for our request unless
// we're using copper argos which only uses tls and the attestation
// data contains the authentication details
var client *zts.ZTSClient
if provider != "" {
client, err = certClient(ztsURL, nil, "", caCertFile)
} else if serviceCert == "" {
ntoken, err := getNToken(domain, service, keyID, keyBytes)
if err != nil {
log.Fatalln(err)
}
client, err = ntokenClient(ztsURL, ntoken, caCertFile, hdr)
} else {
client, err = certClient(ztsURL, keyBytes, serviceCert, caCertFile)
}
if err != nil {
log.Fatalln(err)
}
var certificate, caCertificates string
// if we're given provider then we're going to use our
// copper argos model to request the certificate
if provider != "" {
if instanceId == "" {
log.Println("Error: Please specify instance value. Run with -help for command line arguments")
usage()
}
if attestationData == "" {
if attestationDataFile != "" {
attestationDataBytes, err := ioutil.ReadFile(attestationDataFile)
if err != nil {
log.Fatalln(err)
}
attestationData = string(attestationDataBytes)
} else {
attestationData, err = getNToken(domain, service, keyID, keyBytes)
if err != nil {
log.Fatalln(err)
}
}
}
req := &zts.InstanceRegisterInformation{
Provider: zts.ServiceName(provider),
Domain: zts.DomainName(domain),
Service: zts.SimpleName(service),
AttestationData: attestationData,
Csr: csrData,
}
// request a tls certificate for this service
identity, _, err := client.PostInstanceRegisterInformation(req)
if err != nil {
log.Fatalln(err)
}
certificate = identity.X509Certificate
caCertificates = identity.X509CertificateSigner
} else {
expiryTime32 := int32(expiryTime)
req := &zts.InstanceRefreshRequest{
Csr: csrData,
KeyId: keyID,
ExpiryTime: &expiryTime32,
}
// request a tls certificate for this service
identity, err := client.PostInstanceRefreshRequest(zts.CompoundName(domain), zts.SimpleName(service), req)
if err != nil {
log.Fatalln(err)
}
certificate = identity.Certificate
caCertificates = identity.CaCertBundle
}
if certFile != "" {
err = ioutil.WriteFile(certFile, []byte(certificate), 0444)
if err != nil {
log.Fatalln(err)
}
} else {
fmt.Println(certificate)
}
if signerCertFile != "" {
err = ioutil.WriteFile(signerCertFile, []byte(caCertificates), 0444)
if err != nil {
log.Fatalln(err)
}
}
}
func generatePrivateKey(serviceKey string) ([]byte, error) {
rsaKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
keyBytes := getPEMBlock(rsaKey)
err = ioutil.WriteFile(serviceKey, keyBytes, 0400)
if err != nil {
return nil, err
}
return keyBytes, nil
}
func getPEMBlock(privateKey *rsa.PrivateKey) []byte {
block := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
}
return pem.EncodeToMemory(block)
}
func fetchInstanceRegisterToken(ztsURL, svcKeyFile, svcCertFile, caCertFile, ntokenFile, hdr, provider, domain, service, instance string) (string, error) {
var client *zts.ZTSClient
var err error
if svcKeyFile != "" {
client, err = athenzutils.ZtsClient(ztsURL, svcKeyFile, svcCertFile, caCertFile, true)
} else {
// we need to load our ntoken from the given file
ntokenBytes, err := ioutil.ReadFile(ntokenFile)
if err != nil {
return "", err
}
ntoken := strings.TrimSpace(string(ntokenBytes))
client, err = ntokenClient(ztsURL, ntoken, hdr, caCertFile)
}
if err != nil {
return "", err
}
instanceRegisterToken, err := client.GetInstanceRegisterToken(zts.ServiceName(provider), zts.DomainName(domain), zts.SimpleName(service), zts.PathElement(instance))
if err != nil {
return "", err
}
return instanceRegisterToken.AttestationData, nil
}
func newSigner(privateKeyPEM []byte) (*signer, error) {
block, _ := pem.Decode(privateKeyPEM)
if block == nil {
return nil, fmt.Errorf("unable to load private key")
}
switch block.Type {
case "EC PRIVATE KEY":
key, err := x509.ParseECPrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return &signer{key: key, algorithm: x509.ECDSAWithSHA256}, nil
case "RSA PRIVATE KEY":
key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return &signer{key: key, algorithm: x509.SHA256WithRSA}, nil
default:
return nil, fmt.Errorf("unsupported private key type: %s", block.Type)
}
}
func generateCSR(keySigner *signer, subj pkix.Name, host, instanceId, ip, uri string) (string, error) {
template := x509.CertificateRequest{
Subject: subj,
SignatureAlgorithm: keySigner.algorithm,
}
if host != "" {
template.DNSNames = []string{host}
}
if uri != "" {
uriptr, err := url.Parse(uri)
if err == nil {
template.URIs = []*url.URL{uriptr}
}
}
if instanceId != "" {
uriptr, err := url.Parse(instanceId)
if err == nil {
if len(template.URIs) > 0 {
template.URIs = append(template.URIs, uriptr)
} else {
template.URIs = []*url.URL{uriptr}
}
}
}
if ip != "" {
template.IPAddresses = []net.IP{net.ParseIP(ip)}
}
csr, err := x509.CreateCertificateRequest(rand.Reader, &template, keySigner.key)
if err != nil {
return "", fmt.Errorf("cannot create CSR: %v", err)
}
block := &pem.Block{
Type: "CERTIFICATE REQUEST",
Bytes: csr,
}
var buf bytes.Buffer
err = pem.Encode(&buf, block)
if err != nil {
return "", fmt.Errorf("cannot encode CSR to PEM: %v", err)
}
return buf.String(), nil
}
func getNToken(domain, service, keyID string, keyBytes []byte) (string, error) {
if keyID == "" {
return "", errors.New("missing key-version for the specified private key")
}
// get token builder instance
builder, err := zmssvctoken.NewTokenBuilder(domain, service, keyBytes, keyID)
if err != nil {
return "", err
}
// set optional attributes
builder.SetExpiration(10 * time.Minute)
// get a token instance that always gives you unexpired tokens values
// safe for concurrent use
tok := builder.Token()
// get a token for use
return tok.Value()
}
func ntokenClient(ztsURL, ntoken, caCertFile, hdr string) (*zts.ZTSClient, error) {
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
ResponseHeaderTimeout: 30 * time.Second,
}
if caCertFile != "" {
config := &tls.Config{}
certPool := x509.NewCertPool()
caCert, err := ioutil.ReadFile(caCertFile)
if err != nil {
return nil, err
}
certPool.AppendCertsFromPEM(caCert)
config.RootCAs = certPool
transport.TLSClientConfig = config
}
// use the ntoken to talk to Athenz
client := zts.NewClient(ztsURL, transport)
client.AddCredentials(hdr, ntoken)
return &client, nil
}
func certClient(ztsURL string, keyBytes []byte, certfile, caCertFile string) (*zts.ZTSClient, error) {
var certpem []byte
var err error
if certfile != "" {
certpem, err = ioutil.ReadFile(certfile)
if err != nil {
return nil, err
}
}
var cacertpem []byte
if caCertFile != "" {
cacertpem, err = ioutil.ReadFile(caCertFile)
if err != nil {
return nil, err
}
}
config, err := tlsConfiguration(keyBytes, certpem, cacertpem)
if err != nil {
return nil, err
}
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: config,
}
client := zts.NewClient(ztsURL, transport)
return &client, nil
}
func tlsConfiguration(keypem, certpem, cacertpem []byte) (*tls.Config, error) {
config := &tls.Config{}
if certpem != nil && keypem != nil {
mycert, err := tls.X509KeyPair(certpem, keypem)
if err != nil {
return nil, err
}
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0] = mycert
}
if cacertpem != nil {
certPool := x509.NewCertPool()
certPool.AppendCertsFromPEM(cacertpem)
config.RootCAs = certPool
}
return config, nil
}