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kubeconfig.go
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kubeconfig.go
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package controller
import (
"fmt"
"time"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apimachinery/pkg/util/rand"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
const (
secretTypeBootstrapToken v1.SecretType = "bootstrap.kubernetes.io/token"
machineNameLabelKey = "machine.k8s.io/machine.name"
tokenIDKey = "token-id"
tokenSecretKey = "token-secret"
expirationKey = "expiration"
tokenFormatter = "%s.%s"
)
func (c *Controller) createBootstrapKubeconfig(name string) (*clientcmdapi.Config, error) {
token, err := c.createBootstrapToken(name)
if err != nil {
return nil, err
}
infoKubeconfig, err := c.kubeconfigProvider.GetKubeconfig()
if err != nil {
return nil, err
}
outConfig := infoKubeconfig.DeepCopy()
outConfig.AuthInfos = map[string]*clientcmdapi.AuthInfo{
"": {
Token: token,
},
}
return outConfig, nil
}
func (c *Controller) createBootstrapToken(name string) (string, error) {
existingSecret, err := c.getSecretIfExists(name)
if err != nil {
return "", err
}
if existingSecret != nil {
return c.updateSecretExpirationAndGetToken(existingSecret)
}
tokenID := rand.String(6)
tokenSecret := rand.String(16)
secret := v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: fmt.Sprintf("bootstrap-token-%s", tokenID),
Labels: map[string]string{machineNameLabelKey: name},
},
Type: secretTypeBootstrapToken,
Data: map[string][]byte{
"description": []byte("bootstrap token for " + name),
tokenIDKey: []byte(tokenID),
tokenSecretKey: []byte(tokenSecret),
expirationKey: []byte(metav1.Now().Add(1 * time.Hour).Format(time.RFC3339)),
"usage-bootstrap-authentication": []byte("true"),
"usage-bootstrap-signing": []byte("true"),
"auth-extra-groups": []byte("system:bootstrappers:machine-controller:default-node-token"),
},
}
_, err = c.kubeClient.CoreV1().Secrets(metav1.NamespaceSystem).Create(&secret)
if err != nil {
return "", err
}
return fmt.Sprintf(tokenFormatter, tokenID, tokenSecret), nil
}
func (c *Controller) updateSecretExpirationAndGetToken(secret *v1.Secret) (string, error) {
if secret.Data == nil {
secret.Data = map[string][]byte{}
}
tokenID := string(secret.Data[tokenIDKey])
tokenSecret := string(secret.Data[tokenSecretKey])
token := fmt.Sprintf(tokenFormatter, tokenID, tokenSecret)
expirationTime, err := time.Parse(time.RFC3339, string(secret.Data[expirationKey]))
if err != nil {
return "", err
}
//If the token is close to expire, reset it's expiration time
if expirationTime.Sub(time.Now()).Minutes() < 30 {
secret.Data[expirationKey] = []byte(metav1.Now().Add(1 * time.Hour).Format(time.RFC3339))
} else {
return token, nil
}
_, err = c.kubeClient.CoreV1().Secrets(metav1.NamespaceSystem).Update(secret)
if err != nil {
return "", err
}
return token, nil
}
func (c *Controller) getSecretIfExists(name string) (*v1.Secret, error) {
req, err := labels.NewRequirement(machineNameLabelKey, selection.Equals, []string{name})
if err != nil {
return nil, err
}
selector := labels.NewSelector().Add(*req)
secrets, err := c.secretSystemNsLister.List(selector)
if err != nil {
return nil, err
}
if len(secrets) == 0 {
return nil, nil
}
if len(secrets) > 1 {
return nil, fmt.Errorf("expected to find exactly one secret for the given machine name =%s but found %d", name, len(secrets))
}
return secrets[0], nil
}