-
Notifications
You must be signed in to change notification settings - Fork 47
/
k8sutil.go
567 lines (501 loc) · 20.3 KB
/
k8sutil.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
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package k8sapi
import (
"context"
"crypto/rand"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/fs"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/edgelesssys/constellation/v2/bootstrapper/internal/kubelet"
"github.com/edgelesssys/constellation/v2/bootstrapper/internal/kubernetes/k8sapi/resources"
"github.com/edgelesssys/constellation/v2/internal/constants"
"github.com/edgelesssys/constellation/v2/internal/kubernetes"
"github.com/edgelesssys/constellation/v2/internal/role"
kubeconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
"github.com/edgelesssys/constellation/v2/internal/crypto"
"github.com/edgelesssys/constellation/v2/internal/file"
"github.com/edgelesssys/constellation/v2/internal/logger"
"github.com/edgelesssys/constellation/v2/internal/versions"
"github.com/spf13/afero"
"go.uber.org/zap"
"golang.org/x/text/transform"
corev1 "k8s.io/api/core/v1"
)
const (
// kubeletStartTimeout is the maximum time given to the kubelet service to (re)start.
kubeletStartTimeout = 10 * time.Minute
// crdTimeout is the maximum time given to the CRDs to be created.
crdTimeout = 30 * time.Second
)
// Client provides the functions to talk to the k8s API.
type Client interface {
Apply(resources kubernetes.Marshaler, forceConflicts bool) error
SetKubeconfig(kubeconfig []byte)
CreateConfigMap(ctx context.Context, configMap corev1.ConfigMap) error
AddTolerationsToDeployment(ctx context.Context, tolerations []corev1.Toleration, name string, namespace string) error
AddNodeSelectorsToDeployment(ctx context.Context, selectors map[string]string, name string, namespace string) error
WaitForCRDs(ctx context.Context, crds []string) error
ListAllNamespaces(ctx context.Context) (*corev1.NamespaceList, error)
}
type installer interface {
Install(
ctx context.Context, sourceURL string, destinations []string, perm fs.FileMode,
extract bool, transforms ...transform.Transformer,
) error
}
// KubernetesUtil provides low level management of the kubernetes cluster.
type KubernetesUtil struct {
inst installer
file file.Handler
}
// NewKubernetesUtil creates a new KubernetesUtil.
func NewKubernetesUtil() *KubernetesUtil {
return &KubernetesUtil{
inst: newOSInstaller(),
file: file.NewHandler(afero.NewOsFs()),
}
}
// InstallComponents installs kubernetes components in the version specified.
func (k *KubernetesUtil) InstallComponents(ctx context.Context, version versions.ValidK8sVersion) error {
versionConf := versions.VersionConfigs[version]
if err := k.inst.Install(
ctx, versionConf.CNIPluginsURL, []string{cniPluginsDir}, executablePerm, true,
); err != nil {
return fmt.Errorf("installing cni plugins: %w", err)
}
if err := k.inst.Install(
ctx, versionConf.CrictlURL, []string{binDir}, executablePerm, true,
); err != nil {
return fmt.Errorf("installing crictl: %w", err)
}
if err := k.inst.Install(
ctx, versionConf.KubeletURL, []string{kubeletPath}, executablePerm, false,
); err != nil {
return fmt.Errorf("installing kubelet: %w", err)
}
if err := k.inst.Install(
ctx, versionConf.KubeadmURL, []string{kubeadmPath}, executablePerm, false,
); err != nil {
return fmt.Errorf("installing kubeadm: %w", err)
}
if err := k.inst.Install(
ctx, versionConf.KubectlURL, []string{constants.KubectlPath}, executablePerm, false,
); err != nil {
return fmt.Errorf("installing kubectl: %w", err)
}
return enableSystemdUnit(ctx, kubeletServicePath)
}
func (k *KubernetesUtil) InitCluster(
ctx context.Context, initConfig []byte, nodeName string, ips []net.IP, controlPlaneEndpoint string, conformanceMode bool, log *logger.Logger,
) error {
// TODO: audit policy should be user input
auditPolicy, err := resources.NewDefaultAuditPolicy().Marshal()
if err != nil {
return fmt.Errorf("generating default audit policy: %w", err)
}
if err := os.WriteFile(auditPolicyPath, auditPolicy, 0o644); err != nil {
return fmt.Errorf("writing default audit policy: %w", err)
}
initConfigFile, err := os.CreateTemp("", "kubeadm-init.*.yaml")
if err != nil {
return fmt.Errorf("creating init config file %v: %w", initConfigFile.Name(), err)
}
if _, err := initConfigFile.Write(initConfig); err != nil {
return fmt.Errorf("writing kubeadm init yaml config %v: %w", initConfigFile.Name(), err)
}
// preflight
log.Infof("Running kubeadm preflight checks")
cmd := exec.CommandContext(ctx, kubeadmPath, "init", "phase", "preflight", "-v=5", "--config", initConfigFile.Name())
out, err := cmd.CombinedOutput()
if err != nil {
var exitErr *exec.ExitError
if errors.As(err, &exitErr) {
return fmt.Errorf("kubeadm init phase preflight failed (code %v) with: %s", exitErr.ExitCode(), out)
}
return fmt.Errorf("kubeadm init: %w", err)
}
// create CA certs
log.Infof("Creating Kubernetes control-plane certificates and keys")
cmd = exec.CommandContext(ctx, kubeadmPath, "init", "phase", "certs", "all", "-v=5", "--config", initConfigFile.Name())
out, err = cmd.CombinedOutput()
if err != nil {
var exitErr *exec.ExitError
if errors.As(err, &exitErr) {
return fmt.Errorf("kubeadm init phase certs all failed (code %v) with: %s", exitErr.ExitCode(), out)
}
return fmt.Errorf("kubeadm init: %w", err)
}
// create kubelet key and CA signed certificate for the node
log.Infof("Creating signed kubelet certificate")
if err := k.createSignedKubeletCert(nodeName, ips); err != nil {
return err
}
log.Infof("Preparing node for Konnectivity")
if err := k.prepareControlPlaneForKonnectivity(ctx, controlPlaneEndpoint); err != nil {
return fmt.Errorf("setup konnectivity: %w", err)
}
// initialize the cluster
log.Infof("Initializing the cluster using kubeadm init")
skipPhases := "--skip-phases=preflight,certs"
if !conformanceMode {
skipPhases += ",addon/kube-proxy"
}
cmd = exec.CommandContext(ctx, kubeadmPath, "init", "-v=5", skipPhases, "--config", initConfigFile.Name())
out, err = cmd.CombinedOutput()
if err != nil {
var exitErr *exec.ExitError
if errors.As(err, &exitErr) {
return fmt.Errorf("kubeadm init failed (code %v) with: %s", exitErr.ExitCode(), out)
}
return fmt.Errorf("kubeadm init: %w", err)
}
log.With(zap.String("output", string(out))).Infof("kubeadm init succeeded")
return nil
}
func (k *KubernetesUtil) prepareControlPlaneForKonnectivity(ctx context.Context, loadBalancerEndpoint string) error {
if !strings.Contains(loadBalancerEndpoint, ":") {
loadBalancerEndpoint = net.JoinHostPort(loadBalancerEndpoint, strconv.Itoa(constants.KubernetesPort))
}
if err := os.MkdirAll("/etc/kubernetes/manifests", os.ModePerm); err != nil {
return fmt.Errorf("creating static pods directory: %w", err)
}
konnectivityServerYaml, err := resources.NewKonnectivityServerStaticPod().Marshal()
if err != nil {
return fmt.Errorf("generating konnectivity server static pod: %w", err)
}
if err := os.WriteFile("/etc/kubernetes/manifests/konnectivity-server.yaml", konnectivityServerYaml, 0o644); err != nil {
return fmt.Errorf("writing konnectivity server pod: %w", err)
}
egressConfigYaml, err := resources.NewEgressSelectorConfiguration().Marshal()
if err != nil {
return fmt.Errorf("generating egress selector configuration: %w", err)
}
if err := os.WriteFile("/etc/kubernetes/egress-selector-configuration.yaml", egressConfigYaml, 0o644); err != nil {
return fmt.Errorf("writing egress selector config: %w", err)
}
if err := k.createSignedKonnectivityCert(); err != nil {
return fmt.Errorf("generating konnectivity server certificate: %w", err)
}
if out, err := exec.CommandContext(ctx, constants.KubectlPath, "config", "set-credentials", "--kubeconfig", "/etc/kubernetes/konnectivity-server.conf", "system:konnectivity-server",
"--client-certificate", "/etc/kubernetes/konnectivity.crt", "--client-key", "/etc/kubernetes/konnectivity.key", "--embed-certs=true").CombinedOutput(); err != nil {
return fmt.Errorf("konnectivity kubeconfig set-credentials: %w, %s", err, string(out))
}
if out, err := exec.CommandContext(ctx, constants.KubectlPath, "--kubeconfig", "/etc/kubernetes/konnectivity-server.conf", "config", "set-cluster", "kubernetes", "--server", "https://"+loadBalancerEndpoint,
"--certificate-authority", "/etc/kubernetes/pki/ca.crt", "--embed-certs=true").CombinedOutput(); err != nil {
return fmt.Errorf("konnectivity kubeconfig set-cluster: %w, %s", err, string(out))
}
if out, err := exec.CommandContext(ctx, constants.KubectlPath, "--kubeconfig", "/etc/kubernetes/konnectivity-server.conf", "config", "set-context", "system:konnectivity-server@kubernetes",
"--cluster", "kubernetes", "--user", "system:konnectivity-server").CombinedOutput(); err != nil {
return fmt.Errorf("konnectivity kubeconfig set-context: %w, %s", err, string(out))
}
if out, err := exec.CommandContext(ctx, constants.KubectlPath, "--kubeconfig", "/etc/kubernetes/konnectivity-server.conf", "config", "use-context", "system:konnectivity-server@kubernetes").CombinedOutput(); err != nil {
return fmt.Errorf("konnectivity kubeconfig use-context: %w, %s", err, string(out))
}
// cleanup
if err := os.Remove("/etc/kubernetes/konnectivity.crt"); err != nil {
return fmt.Errorf("removing konnectivity certificate: %w", err)
}
if err := os.Remove("/etc/kubernetes/konnectivity.key"); err != nil {
return fmt.Errorf("removing konnectivity key: %w", err)
}
return nil
}
func (k *KubernetesUtil) SetupKonnectivity(kubectl Client, konnectivityAgentsDaemonSet kubernetes.Marshaler) error {
return kubectl.Apply(konnectivityAgentsDaemonSet, true)
}
type SetupPodNetworkInput struct {
CloudProvider string
NodeName string
FirstNodePodCIDR string
SubnetworkPodCIDR string
ProviderID string
LoadBalancerEndpoint string
}
// FixCilium fixes https://github.com/cilium/cilium/issues/19958 but instead of a rollout restart of
// the cilium daemonset, it only restarts the local cilium pod.
func (k *KubernetesUtil) FixCilium(log *logger.Logger) {
// wait for cilium pod to be healthy
client := http.Client{}
for {
time.Sleep(5 * time.Second)
req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, "http://127.0.0.1:9879/healthz", http.NoBody)
if err != nil {
log.With(zap.Error(err)).Errorf("Unable to create request")
continue
}
resp, err := client.Do(req)
if err != nil {
log.With(zap.Error(err)).Warnf("Waiting for local cilium daemonset pod not healthy")
continue
}
resp.Body.Close()
if resp.StatusCode == 200 {
break
}
}
// get cilium container id
out, err := exec.CommandContext(context.Background(), "/run/state/bin/crictl", "ps", "--name", "cilium-agent", "-q").CombinedOutput()
if err != nil {
log.With(zap.Error(err)).Errorf("Getting cilium container id failed: %s", out)
return
}
outLines := strings.Split(string(out), "\n")
if len(outLines) < 2 {
log.Errorf("Getting cilium container id returned invalid output: %s", out)
return
}
containerID := outLines[len(outLines)-2]
// get cilium pod id
out, err = exec.CommandContext(context.Background(), "/run/state/bin/crictl", "inspect", "-o", "go-template", "--template", "{{ .info.sandboxID }}", containerID).CombinedOutput()
if err != nil {
log.With(zap.Error(err)).Errorf("Getting cilium pod id failed: %s", out)
return
}
outLines = strings.Split(string(out), "\n")
if len(outLines) < 2 {
log.Errorf("Getting cilium pod id returned invalid output: %s", out)
return
}
podID := outLines[len(outLines)-2]
// stop and delete pod
out, err = exec.CommandContext(context.Background(), "/run/state/bin/crictl", "stopp", podID).CombinedOutput()
if err != nil {
log.With(zap.Error(err)).Errorf("Stopping cilium agent pod failed: %s", out)
return
}
out, err = exec.CommandContext(context.Background(), "/run/state/bin/crictl", "rmp", podID).CombinedOutput()
if err != nil {
log.With(zap.Error(err)).Errorf("Removing cilium agent pod failed: %s", out)
}
}
// SetupAutoscaling deploys the k8s cluster autoscaler.
func (k *KubernetesUtil) SetupAutoscaling(kubectl Client, clusterAutoscalerConfiguration kubernetes.Marshaler, secrets kubernetes.Marshaler) error {
if err := kubectl.Apply(secrets, true); err != nil {
return fmt.Errorf("applying cluster-autoscaler Secrets: %w", err)
}
return kubectl.Apply(clusterAutoscalerConfiguration, true)
}
// SetupGCPGuestAgent deploys the GCP guest agent daemon set.
func (k *KubernetesUtil) SetupGCPGuestAgent(kubectl Client, guestAgentDaemonset kubernetes.Marshaler) error {
return kubectl.Apply(guestAgentDaemonset, true)
}
// SetupAccessManager deploys the constellation-access-manager for deploying SSH keys on control-plane & worker nodes.
func (k *KubernetesUtil) SetupAccessManager(kubectl Client, accessManagerConfiguration kubernetes.Marshaler) error {
return kubectl.Apply(accessManagerConfiguration, true)
}
// SetupVerificationService deploys the verification service.
func (k *KubernetesUtil) SetupVerificationService(kubectl Client, verificationServiceConfiguration kubernetes.Marshaler) error {
return kubectl.Apply(verificationServiceConfiguration, true)
}
func (k *KubernetesUtil) SetupOperatorLifecycleManager(ctx context.Context, kubectl Client, olmCRDs, olmConfiguration kubernetes.Marshaler, crdNames []string) error {
if err := kubectl.Apply(olmCRDs, true); err != nil {
return fmt.Errorf("applying OLM CRDs: %w", err)
}
crdReadyTimeout, cancel := context.WithTimeout(ctx, crdTimeout)
defer cancel()
if err := kubectl.WaitForCRDs(crdReadyTimeout, crdNames); err != nil {
return fmt.Errorf("waiting for OLM CRDs: %w", err)
}
return kubectl.Apply(olmConfiguration, true)
}
func (k *KubernetesUtil) SetupNodeMaintenanceOperator(kubectl Client, nodeMaintenanceOperatorConfiguration kubernetes.Marshaler) error {
return kubectl.Apply(nodeMaintenanceOperatorConfiguration, true)
}
func (k *KubernetesUtil) SetupNodeOperator(ctx context.Context, kubectl Client, nodeOperatorConfiguration kubernetes.Marshaler) error {
return kubectl.Apply(nodeOperatorConfiguration, true)
}
// JoinCluster joins existing Kubernetes cluster using kubeadm join.
func (k *KubernetesUtil) JoinCluster(ctx context.Context, joinConfig []byte, peerRole role.Role, controlPlaneEndpoint string, log *logger.Logger) error {
// TODO: audit policy should be user input
auditPolicy, err := resources.NewDefaultAuditPolicy().Marshal()
if err != nil {
return fmt.Errorf("generating default audit policy: %w", err)
}
if err := os.WriteFile(auditPolicyPath, auditPolicy, 0o644); err != nil {
return fmt.Errorf("writing default audit policy: %w", err)
}
joinConfigFile, err := os.CreateTemp("", "kubeadm-join.*.yaml")
if err != nil {
return fmt.Errorf("creating join config file %v: %w", joinConfigFile.Name(), err)
}
if _, err := joinConfigFile.Write(joinConfig); err != nil {
return fmt.Errorf("writing kubeadm init yaml config %v: %w", joinConfigFile.Name(), err)
}
if peerRole == role.ControlPlane {
log.Infof("Prep Init Kubernetes cluster")
if err := k.prepareControlPlaneForKonnectivity(ctx, controlPlaneEndpoint); err != nil {
return fmt.Errorf("setup konnectivity: %w", err)
}
}
// run `kubeadm join` to join a worker node to an existing Kubernetes cluster
cmd := exec.CommandContext(ctx, kubeadmPath, "join", "-v=5", "--config", joinConfigFile.Name())
out, err := cmd.CombinedOutput()
if err != nil {
var exitErr *exec.ExitError
if errors.As(err, &exitErr) {
return fmt.Errorf("kubeadm join failed (code %v) with: %s (full err: %s)", exitErr.ExitCode(), out, err)
}
return fmt.Errorf("kubeadm join: %w", err)
}
log.With(zap.String("output", string(out))).Infof("kubeadm join succeeded")
return nil
}
// StartKubelet enables and starts the kubelet systemd unit.
func (k *KubernetesUtil) StartKubelet() error {
ctx, cancel := context.WithTimeout(context.TODO(), kubeletStartTimeout)
defer cancel()
if err := enableSystemdUnit(ctx, kubeletServicePath); err != nil {
return fmt.Errorf("enabling kubelet systemd unit: %w", err)
}
return startSystemdUnit(ctx, "kubelet.service")
}
// createSignedKubeletCert manually creates a Kubernetes CA signed kubelet certificate for the bootstrapper node.
// This is necessary because this node does not request a certificate from the join service.
func (k *KubernetesUtil) createSignedKubeletCert(nodeName string, ips []net.IP) error {
// Create CSR
certRequestRaw, kubeletKey, err := kubelet.GetCertificateRequest(nodeName, ips)
if err != nil {
return err
}
if err := k.file.Write(kubelet.KeyFilename, kubeletKey, file.OptMkdirAll); err != nil {
return err
}
certRequest, err := x509.ParseCertificateRequest(certRequestRaw)
if err != nil {
return err
}
// Prepare certificate signing
serialNumber, err := crypto.GenerateCertificateSerialNumber()
if err != nil {
return err
}
now := time.Now()
// Create the kubelet certificate
// For a reference on the certificate fields, see: https://kubernetes.io/docs/setup/best-practices/certificates/
certTmpl := &x509.Certificate{
SerialNumber: serialNumber,
NotBefore: now.Add(-2 * time.Hour),
NotAfter: now.Add(24 * 365 * time.Hour),
Subject: certRequest.Subject,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{
x509.ExtKeyUsageClientAuth,
x509.ExtKeyUsageServerAuth,
},
IsCA: false,
BasicConstraintsValid: true,
IPAddresses: certRequest.IPAddresses,
}
parentCert, parentKey, err := k.getKubernetesCACertAndKey()
if err != nil {
return err
}
// Sign the certificate
certRaw, err := x509.CreateCertificate(rand.Reader, certTmpl, parentCert, certRequest.PublicKey, parentKey)
if err != nil {
return err
}
// Write the certificate
kubeletCert := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: certRaw,
})
return k.file.Write(kubelet.CertificateFilename, kubeletCert, file.OptMkdirAll)
}
// createSignedKonnectivityCert manually creates a Kubernetes CA signed certificate for the Konnectivity server.
func (k *KubernetesUtil) createSignedKonnectivityCert() error {
// Create CSR
certRequestRaw, keyPem, err := resources.GetKonnectivityCertificateRequest()
if err != nil {
return err
}
if err := k.file.Write(resources.KonnectivityKeyFilename, keyPem, file.OptMkdirAll); err != nil {
return err
}
certRequest, err := x509.ParseCertificateRequest(certRequestRaw)
if err != nil {
return err
}
// Prepare certificate signing
serialNumber, err := crypto.GenerateCertificateSerialNumber()
if err != nil {
return err
}
now := time.Now()
// Create the kubelet certificate
// For a reference on the certificate fields, see: https://kubernetes.io/docs/setup/best-practices/certificates/
certTmpl := &x509.Certificate{
SerialNumber: serialNumber,
NotBefore: now.Add(-2 * time.Hour),
NotAfter: now.Add(24 * 365 * time.Hour),
Subject: certRequest.Subject,
}
parentCert, parentKey, err := k.getKubernetesCACertAndKey()
if err != nil {
return err
}
// Sign the certificate
certRaw, err := x509.CreateCertificate(rand.Reader, certTmpl, parentCert, certRequest.PublicKey, parentKey)
if err != nil {
return err
}
// Write the certificate
konnectivityCert := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: certRaw,
})
return k.file.Write(resources.KonnectivityCertificateFilename, konnectivityCert, file.OptMkdirAll)
}
// getKubernetesCACertAndKey returns the Kubernetes CA certificate and key.
// The key of type `any` can be consumed by `x509.CreateCertificate()`.
func (k *KubernetesUtil) getKubernetesCACertAndKey() (*x509.Certificate, any, error) {
parentCertRaw, err := k.file.Read(filepath.Join(
kubeconstants.KubernetesDir,
kubeconstants.DefaultCertificateDir,
kubeconstants.CACertName,
))
if err != nil {
return nil, nil, err
}
parentCert, err := crypto.PemToX509Cert(parentCertRaw)
if err != nil {
return nil, nil, err
}
parentKeyRaw, err := k.file.Read(filepath.Join(
kubeconstants.KubernetesDir,
kubeconstants.DefaultCertificateDir,
kubeconstants.CAKeyName,
))
if err != nil {
return nil, nil, err
}
parentKeyPEM, _ := pem.Decode(parentKeyRaw)
var parentKey any
switch parentKeyPEM.Type {
case "EC PRIVATE KEY":
parentKey, err = x509.ParseECPrivateKey(parentKeyPEM.Bytes)
case "RSA PRIVATE KEY":
parentKey, err = x509.ParsePKCS1PrivateKey(parentKeyPEM.Bytes)
case "PRIVATE KEY":
parentKey, err = x509.ParsePKCS8PrivateKey(parentKeyPEM.Bytes)
default:
err = fmt.Errorf("unsupported key type %q", parentKeyPEM.Type)
}
if err != nil {
return nil, nil, err
}
return parentCert, parentKey, nil
}