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rbac_handler.go
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rbac_handler.go
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// Copyright © 2019 Banzai Cloud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rbachandler
import (
"errors"
"fmt"
"math/rand"
"strings"
"time"
"github.com/banzaicloud/jwt-to-rbac/internal/log"
"github.com/banzaicloud/jwt-to-rbac/pkg/tokenhandler"
"github.com/goph/emperror"
"github.com/goph/logur"
apicorev1 "k8s.io/api/core/v1"
apirbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
clientcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
clientrbacv1 "k8s.io/client-go/kubernetes/typed/rbac/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
const defautlLabelKey string = "generatedby"
var defaultLabel = labels{
defautlLabelKey: "jwttorbac",
}
type rule struct {
verbs []string
resources []string
apiGroups []string
}
type labels map[string]string
// clusterRole implements create ClusterRole
type clusterRole struct {
name string
rules []rule
labels labels
}
// clusterRoleBinding implements create ClusterRoleBinding
type clusterRoleBinding struct {
name string
saName string
roleName string
nameSpace []string
labels labels
}
type roleBinding struct {
name string
saName string
roleName string
nameSpace []string
saNameSpace []string
labels labels
}
// serviceAccount implements create ServiceAccount
type ServiceAccount struct {
Name string
labels labels
namespace string
}
type rbacResources struct {
clusterRoles []clusterRole
clusterRoleBindings []clusterRoleBinding
roleBindings []roleBinding
serviceAccount ServiceAccount
}
// RBACHandler implements getting, creating and deleting resources
type RBACHandler struct {
coreClientSet *clientcorev1.CoreV1Client
rbacClientSet *clientrbacv1.RbacV1Client
logger logur.Logger
}
type RBACList struct {
SAList []string `json:"sa_list,omitempty"`
CRoleList []string `json:"crole_list,omitempty"`
CRoleBindList []string `json:"crolebind_list,omitempty"`
}
type SACredential struct {
Name string `json:"name"`
Data map[string][]byte `json:"data"`
}
// NewRBACHandler create RBACHandler
func NewRBACHandler(kubeconfig string, logger logur.Logger) (*RBACHandler, error) {
coreClientSet, rbacClientSet, err := getK8sClientSets(kubeconfig, logger)
if err != nil {
return nil, err
}
return &RBACHandler{coreClientSet, rbacClientSet, logger}, nil
}
func getK8sClientSets(kubeconfig string, logger logur.Logger) (*clientcorev1.CoreV1Client, *clientrbacv1.RbacV1Client, error) {
var config *rest.Config
var err error
if kubeconfig == "" {
logger.Debug("using in-cluster configuration", nil)
config, err = rest.InClusterConfig()
if err != nil {
return nil, nil, emperror.Wrap(err, "failed to get incluster config")
}
} else {
logger.Debug("using configuration from", map[string]interface{}{"kubeconfig": kubeconfig})
config, err = clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, nil, emperror.WrapWith(err, "failed to get kubernetes config", "kubeconfig", kubeconfig)
}
}
coreClientSet, err := clientcorev1.NewForConfig(config)
if err != nil {
return nil, nil, emperror.Wrap(err, "cannot create new core clientSet")
}
rbacClientSet, err := clientrbacv1.NewForConfig(config)
if err != nil {
return nil, nil, emperror.Wrap(err, "cannot create new rbac clientSet")
}
return coreClientSet, rbacClientSet, nil
}
// ListRBACResources clusterrolebindings
func ListRBACResources(config *Config, logger logur.Logger) (*RBACList, error) {
logger = log.WithFields(logger, map[string]interface{}{"package": "rbachandler"})
rbacHandler, err := NewRBACHandler(config.KubeConfig, logger)
if err != nil {
return &RBACList{}, err
}
cRoleBindList, err := rbacHandler.listClusterroleBindings()
if err != nil {
return &RBACList{}, err
}
cRoleList, err := rbacHandler.listClusterroles()
if err != nil {
return &RBACList{}, err
}
// TODO: crerate a listRoleBindList
saList, err := rbacHandler.listServiceAccount()
if err != nil {
return &RBACList{}, err
}
rbacList := &RBACList{
CRoleBindList: cRoleBindList,
CRoleList: cRoleList,
SAList: saList,
}
return rbacList, nil
}
func (rh *RBACHandler) listClusterroleBindings() ([]string, error) {
bindings := rh.rbacClientSet.ClusterRoleBindings()
labelSelect := fmt.Sprintf("%s=%s", defautlLabelKey, defaultLabel[defautlLabelKey])
listOptions := metav1.ListOptions{
LabelSelector: labelSelect,
}
binds, err := bindings.List(listOptions)
if err != nil {
return nil, emperror.WrapWith(err, "unable to list clusterrolebindings", "ListOptions", metav1.ListOptions{})
}
var cRoleBindList []string
for _, b := range binds.Items {
cRoleBindList = append(cRoleBindList, b.GetName())
}
return cRoleBindList, nil
}
func (rh *RBACHandler) listClusterroles() ([]string, error) {
clusterRoles := rh.rbacClientSet.ClusterRoles()
labelSelect := fmt.Sprintf("%s=%s", defautlLabelKey, defaultLabel[defautlLabelKey])
listOptions := metav1.ListOptions{
LabelSelector: labelSelect,
}
cRoles, err := clusterRoles.List(listOptions)
if err != nil {
return nil, emperror.WrapWith(err, "unable to list clusterroles", "ListOptions", metav1.ListOptions{})
}
var cRoleList []string
for _, b := range cRoles.Items {
cRoleList = append(cRoleList, b.GetName())
}
return cRoleList, nil
}
// ListServiceAccount list serviceaccount
func (rh *RBACHandler) listServiceAccount() ([]string, error) {
labelSelect := fmt.Sprintf("%s=%s", defautlLabelKey, defaultLabel[defautlLabelKey])
listOptions := metav1.ListOptions{
LabelSelector: labelSelect,
}
serviceAccountList, err := rh.coreClientSet.ServiceAccounts("").List(listOptions)
if err != nil {
return nil, emperror.WrapWith(err, "cannot list ServiceAccounts", "label_selector", defaultLabel)
}
var serviceAccList []string
for _, serviceAcc := range serviceAccountList.Items {
serviceAccList = append(serviceAccList, serviceAcc.GetName())
}
return serviceAccList, nil
}
func (rh *RBACHandler) createServiceAccount(sa *ServiceAccount) error {
if _, err := rh.getAndCheckSA(sa.Name); err == nil {
return nil
}
saObj := &apicorev1.ServiceAccount{
TypeMeta: metav1.TypeMeta{
Kind: "ServiceAccount",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: sa.Name,
Namespace: sa.namespace,
Labels: sa.labels,
},
}
_, err := rh.coreClientSet.ServiceAccounts("default").Create(saObj)
if err != nil {
return emperror.WrapWith(err, "create serviceaccount failed", "saName", sa)
}
return nil
}
func (rh *RBACHandler) createClusterRoleBinding(crb *clusterRoleBinding) error {
if err := rh.getAndCheckCRoleBinding(crb.name); err == nil {
return nil
}
var subjects []apirbacv1.Subject
for _, ns := range crb.nameSpace {
subject := apirbacv1.Subject{
Kind: "ServiceAccount",
APIGroup: "",
Name: crb.saName,
Namespace: ns,
}
subjects = append(subjects, subject)
}
bindObj := &apirbacv1.ClusterRoleBinding{
TypeMeta: metav1.TypeMeta{
Kind: "ClusterRoleBinding",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: crb.name,
Labels: crb.labels,
},
Subjects: subjects,
RoleRef: apirbacv1.RoleRef{
Kind: "ClusterRole",
APIGroup: "rbac.authorization.k8s.io",
Name: crb.roleName,
},
}
ownerReferences, err := rh.getSAReference(crb.saName)
if err != nil {
return err
}
bindObj.SetOwnerReferences(ownerReferences)
_, err = rh.rbacClientSet.ClusterRoleBindings().Create(bindObj)
if err != nil {
return emperror.WrapWith(err, "create clusterrolebinding failed", "ClusterRoleBinding", crb.name)
}
return nil
}
func (rh *RBACHandler) createRoleBinding(rb *roleBinding) error {
if err := rh.getAndCheckRoleBinding(rb.name, rb.nameSpace); err == nil {
return nil
}
var subjects []apirbacv1.Subject
for _, ns := range rb.nameSpace {
subject := apirbacv1.Subject{
Kind: "ServiceAccount",
APIGroup: "",
Name: rb.saName,
// Role binding only need a SA in one namespace...
Namespace: rb.saNameSpace[0],
}
subjects = append(subjects, subject)
bindObj := &apirbacv1.RoleBinding{
TypeMeta: metav1.TypeMeta{
Kind: "RoleBinding",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: rb.name,
Labels: rb.labels,
OwnerReferences: []metav1.OwnerReference{},
},
Subjects: subjects,
RoleRef: apirbacv1.RoleRef{
Kind: "ClusterRole",
APIGroup: "rbac.authorization.k8s.io",
Name: rb.roleName,
},
}
_, err := rh.rbacClientSet.RoleBindings(ns).Create(bindObj)
if err != nil {
return emperror.WrapWith(err, "create rolebinding failed", "RoleBinding", rb.name)
}
}
return nil
}
func (rh *RBACHandler) createClusterRole(cr *clusterRole) error {
if err := rh.getAndCheckCRole(cr.name); err == nil {
return nil
}
var rules []apirbacv1.PolicyRule
for _, rule := range cr.rules {
rule := apirbacv1.PolicyRule{
Verbs: rule.verbs,
Resources: rule.resources,
APIGroups: rule.apiGroups,
}
rules = append(rules, rule)
}
roleObj := &apirbacv1.ClusterRole{
TypeMeta: metav1.TypeMeta{
Kind: "ClusterRole",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: cr.name,
Labels: cr.labels,
},
Rules: rules,
}
_, err := rh.rbacClientSet.ClusterRoles().Update(roleObj)
if err != nil {
return emperror.WrapWith(err, "create clusterrole failed", "ClusterRole", cr.name)
}
return nil
}
func generateRules(groupName string, config *Config) []rule {
var cRules []rule
for _, cGroup := range config.CustomGroups {
if cGroup.GroupName == groupName {
for _, cRule := range cGroup.CustomRules {
rule := rule{
verbs: cRule.Verbs,
resources: cRule.Resources,
apiGroups: cRule.APIGroups,
}
cRules = append(cRules, rule)
}
break
}
}
return cRules
}
func getCustomGroupNamespaces(groupName string, config *Config) []string {
for _, cGroup := range config.CustomGroups {
if cGroup.GroupName == groupName {
return cGroup.NameSpaces
}
}
return nil
}
func generateClusterRole(group string, config *Config) (clusterRole, error) {
rules := generateRules(group, config)
if len(rules) < 1 {
return clusterRole{}, emperror.With(errors.New("cannot find specified group in jwt-to-rbac config"), "groupName", group)
}
cRole := clusterRole{
name: group + "-from-jwt",
rules: rules,
labels: defaultLabel,
}
return cRole, nil
}
func githubRoleParser(groups []string, org string) []string {
var groupList []string
for _, group := range groups {
if strings.Contains(group, ":") {
orgGroup := strings.Split(group, ":")
if orgGroup[0] == org {
groupList = append(groupList, orgGroup[1])
continue
}
groupList = append(groupList, fmt.Sprintf("%s-%s", orgGroup[0], orgGroup[1]))
continue
}
}
return groupList
}
func generateRbacResources(user *tokenhandler.User, config *Config, nameSpaces []string, logger logur.Logger) (*rbacResources, error) {
var saName string
var groupList []string
switch user.FederatedClaims.ConnectorID {
case "github":
saName = user.FederatedClaims.UserID
groupList = githubRoleParser(user.Groups, config.GithubOrg)
case "ldap", "local":
r := strings.NewReplacer("@", "-", ".", "-", "_", "-")
saName = r.Replace(user.Email)
groupList = user.Groups
default:
return nil, emperror.With(errors.New("connector is not implemented yet"), "ConnectorID", user.FederatedClaims.ConnectorID)
}
if err := DeleteRBAC(saName, config, logger); err != nil {
if !strings.Contains(err.Error(), "not found") {
logger.Error(err.Error(), nil)
return nil, err
}
}
var clusterRoles []clusterRole
var clusterRoleBindings []clusterRoleBinding
var roleBindings []roleBinding
for _, group := range groupList {
var roleName string
switch group {
case "cluster-admin", "admin", "edit", "view":
roleName = group
case "admins":
roleName = "admin"
default:
cRole, err := generateClusterRole(group, config)
if err != nil {
logger.Info(err.Error(), map[string]interface{}{"group": group})
continue
}
clusterRoles = append(clusterRoles, cRole)
roleName = group + "-from-jwt"
}
customGroupNameSpaces := getCustomGroupNamespaces(group, config)
if len(customGroupNameSpaces) == 0 {
cRoleBinding := clusterRoleBinding{
name: saName + "-" + roleName + "-binding",
saName: saName,
roleName: roleName,
nameSpace: nameSpaces,
labels: defaultLabel,
}
clusterRoleBindings = append(clusterRoleBindings, cRoleBinding)
} else {
groupRoleBinding := roleBinding{
name: saName + "-" + roleName + "-binding",
saName: saName,
roleName: roleName,
saNameSpace: nameSpaces,
nameSpace: customGroupNameSpaces,
labels: defaultLabel,
}
roleBindings = append(roleBindings, groupRoleBinding)
}
}
rbacResources := &rbacResources{
clusterRoles: clusterRoles,
clusterRoleBindings: clusterRoleBindings,
serviceAccount: ServiceAccount{
Name: saName,
labels: defaultLabel,
},
roleBindings: roleBindings,
}
return rbacResources, nil
}
func generateClusterRoleRBACResources(config *Config, logger logur.Logger) (*rbacResources, error) {
var clusterRoles []clusterRole
for _, group := range config.CustomGroups {
cRole, err := generateClusterRole(group.GroupName, config)
if err != nil {
logger.Info(err.Error(), map[string]interface{}{"group": group.GroupName})
continue
}
clusterRoles = append(clusterRoles, cRole)
}
rbacResources := &rbacResources{
clusterRoles: clusterRoles,
}
return rbacResources, nil
}
// CreateRBAC create RBAC resources
func CreateRBAC(user *tokenhandler.User, config *Config, logger logur.Logger) (*ServiceAccount, error) {
logger = log.WithFields(logger, map[string]interface{}{"package": "rbachandler"})
rbacHandler, err := NewRBACHandler(config.KubeConfig, logger)
if err != nil {
return &ServiceAccount{}, err
}
rbacResources, err := generateRbacResources(user, config, []string{"default"}, logger)
if err != nil {
logger.Error(err.Error(), nil)
return &ServiceAccount{}, err
}
if err := rbacHandler.createServiceAccount(&rbacResources.serviceAccount); err != nil {
logger.Error(err.Error(), nil)
return &rbacResources.serviceAccount, err
}
if len(rbacResources.clusterRoles) > 0 {
for _, clusterRole := range rbacResources.clusterRoles {
clusterRole := clusterRole
if err := rbacHandler.createClusterRole(&clusterRole); err != nil {
logger.Error(err.Error(), nil)
return &rbacResources.serviceAccount, err
}
}
}
for _, clusterRoleBinding := range rbacResources.clusterRoleBindings {
clusterRoleBinding := clusterRoleBinding
if err := rbacHandler.createClusterRoleBinding(&clusterRoleBinding); err != nil {
logger.Error(err.Error(), nil)
return &rbacResources.serviceAccount, err
}
}
for _, roleBinding := range rbacResources.roleBindings {
roleBinding := roleBinding
if err := rbacHandler.createRoleBinding(&roleBinding); err != nil {
logger.Error(err.Error(), nil)
return &rbacResources.serviceAccount, err
}
}
if _, err = CreateSAToken(rbacResources.serviceAccount.Name, config, "", logger); err != nil {
logger.Error(err.Error(), nil)
return &rbacResources.serviceAccount, err
}
return &rbacResources.serviceAccount, nil
}
func (rh *RBACHandler) getAndCheckSA(saName string) (*apicorev1.ServiceAccount, error) {
saDetails, err := rh.coreClientSet.ServiceAccounts("default").Get(saName, metav1.GetOptions{})
if err != nil {
return nil, emperror.Wrap(err, "unable to get ServiceAccount details")
}
if label, ok := saDetails.ObjectMeta.Labels[defautlLabelKey]; !ok || label != defaultLabel[defautlLabelKey] {
return nil, emperror.WrapWith(errors.New("label mismatch in serviceaccount"),
"getting not jwt-to-rbac generated ServiceAccount is forbidden",
defautlLabelKey, defaultLabel[defautlLabelKey],
"service_account", saName)
}
return saDetails, nil
}
func (rh *RBACHandler) getAndCheckCRole(CRName string) error {
cRole, err := rh.rbacClientSet.ClusterRoles().Get(CRName, metav1.GetOptions{})
if err == nil {
if label, ok := cRole.ObjectMeta.Labels[defautlLabelKey]; !ok || label != defaultLabel[defautlLabelKey] {
return emperror.WrapWith(errors.New("label mismatch in clusterrole"),
"there is a ClusterRole without required label",
defautlLabelKey, defaultLabel[defautlLabelKey],
"cluster_role", CRName)
}
return nil
}
return err
}
func (rh *RBACHandler) getAndCheckCRoleBinding(CRBindingName string) error {
cRoleBind, err := rh.rbacClientSet.ClusterRoleBindings().Get(CRBindingName, metav1.GetOptions{})
if err == nil {
if label, ok := cRoleBind.ObjectMeta.Labels[defautlLabelKey]; !ok || label != defaultLabel[defautlLabelKey] {
return emperror.WrapWith(errors.New("label mismatch in clusterrole"),
"there is a ClusterRoleBinding without required label",
defautlLabelKey, defaultLabel[defautlLabelKey],
"cluster_rolebinding", CRBindingName)
}
return nil
}
return err
}
func (rh *RBACHandler) getAndCheckRoleBinding(RBindingName string, NameSpaces []string) error {
for _, namespace := range NameSpaces {
roleBind, err := rh.rbacClientSet.RoleBindings(namespace).Get(RBindingName, metav1.GetOptions{})
if err == nil {
if label, ok := roleBind.ObjectMeta.Labels[defautlLabelKey]; !ok || label != defaultLabel[defautlLabelKey] {
return emperror.WrapWith(errors.New("label mismatch in clusterrole"),
"there is a RoleBinding without required label",
defautlLabelKey, defaultLabel[defautlLabelKey],
"rolebinding", RBindingName)
}
continue
}
return err
}
return nil
}
func (rh *RBACHandler) getSAReference(saName string) ([]metav1.OwnerReference, error) {
saDetails, err := rh.getAndCheckSA(saName)
if err != nil {
return nil, err
}
owner := metav1.OwnerReference{
APIVersion: "v1",
Kind: "ServiceAccount",
Name: saName,
UID: saDetails.ObjectMeta.UID,
}
return []metav1.OwnerReference{owner}, nil
}
func (rh *RBACHandler) removeServiceAccount(saName string, logger logur.Logger) error {
if _, err := rh.getAndCheckSA(saName); err != nil {
return err
}
err := rh.coreClientSet.ServiceAccounts("default").Delete(saName, &metav1.DeleteOptions{})
if err != nil {
return emperror.WrapWith(err, "unable to delete ServiceAccount", "service_account", saName)
}
return nil
}
// DeleteRBAC deletes RBAC resources
func DeleteRBAC(saName string, config *Config, logger logur.Logger) error {
rbacHandler, err := NewRBACHandler(config.KubeConfig, logger)
if err != nil {
return err
}
if err := rbacHandler.removeServiceAccount(saName, logger); err != nil {
logger.Error(err.Error(), nil)
return err
}
return nil
}
// GetK8sToken getting serviceaccount secrets data
func GetK8sToken(saName string, config *Config, logger logur.Logger) ([]*SACredential, error) {
rbacHandler, err := NewRBACHandler(config.KubeConfig, logger)
if err != nil {
return nil, err
}
saCreds, err := rbacHandler.listSACredentials(saName)
if err != nil {
return nil, err
}
return saCreds, nil
}
func (rh *RBACHandler) listSACredentials(saName string) ([]*SACredential, error) {
saDetails, err := rh.getAndCheckSA(saName)
if err != nil {
return nil, err
}
var saCreds []*SACredential
labelSelect := fmt.Sprintf("%s=%s", defautlLabelKey, defaultLabel[defautlLabelKey])
listOptions := metav1.ListOptions{
LabelSelector: labelSelect,
}
secrets, err := rh.coreClientSet.Secrets(saDetails.GetNamespace()).List(listOptions)
if err != nil {
return nil, err
}
for _, s := range secrets.Items {
if s.Type == apicorev1.SecretTypeServiceAccountToken {
name := s.Annotations[apicorev1.ServiceAccountNameKey]
if name == saName {
secret, err := rh.getSecret(s.Name)
if err != nil {
return nil, err
}
saCred := &SACredential{
Name: secret.Name,
Data: secret.Data,
}
saCreds = append(saCreds, saCred)
}
}
}
return saCreds, nil
}
func (rh *RBACHandler) getSecret(name string) (*apicorev1.Secret, error) {
secret, err := rh.coreClientSet.Secrets("default").Get(name, metav1.GetOptions{})
if err != nil {
return nil, emperror.With(err, "secret", name)
}
return secret, nil
}
func calculateDeleteTime(ttl string) (string, error) {
dur, err := time.ParseDuration(ttl)
if err != nil {
return "", emperror.Wrap(err, "ttl parse failed")
}
return time.Now().Add(dur).Format(time.RFC3339), nil
}
func (rh *RBACHandler) createSecret(saName string, ttl string) (*apicorev1.Secret, error) {
saDetails, err := rh.getAndCheckSA(saName)
if err != nil {
return nil, err
}
deleteTime, err := calculateDeleteTime(ttl)
if err != nil {
return nil, err
}
secretName := saName + tokenRandString(5)
secretObj := &apicorev1.Secret{
TypeMeta: metav1.TypeMeta{
Kind: "Secret",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
Namespace: saDetails.Namespace,
Annotations: map[string]string{
apicorev1.ServiceAccountNameKey: saName,
"banzaicloud.io/timetolive": deleteTime,
},
Labels: defaultLabel,
},
Type: apicorev1.SecretTypeServiceAccountToken,
}
secret, err := rh.coreClientSet.Secrets("default").Create(secretObj)
if err != nil {
return nil, emperror.WrapWith(err, "create secret failed", "secretName", secretName)
}
return secret, nil
}
// CreateSAToken creates service account token with ttl
func CreateSAToken(saName string, config *Config, duration string, logger logur.Logger) (*SACredential, error) {
rbacHandler, err := NewRBACHandler(config.KubeConfig, logger)
if err != nil {
return nil, err
}
var ttl string
if duration != "" {
ttl = duration
} else {
ttl = config.TokenTTL
}
secret, err := rbacHandler.createSecret(saName, ttl)
if err != nil {
return nil, err
}
secretName := secret.GetName()
secretData, err := func() (map[string][]byte, error) {
timeout := time.After(5 * time.Second)
ticker := time.NewTicker(500 * time.Millisecond)
for {
select {
case <-timeout:
return nil, emperror.With(errors.New("timeout getting secret"), "secret_name", secretName)
case <-ticker.C:
secret, err := rbacHandler.getSecret(secretName)
if err != nil {
return nil, err
}
if secret.Data != nil {
return secret.Data, nil
}
}
}
}()
if err != nil {
return nil, err
}
return &SACredential{Name: secretName, Data: secretData}, nil
}
func tokenRandString(n int) string {
letterRunes := []rune("0123456789abcdefghijklmnopqrstuvwxyz")
seededRand := rand.New(rand.NewSource(time.Now().UnixNano()))
b := make([]rune, n)
l := len(letterRunes)
for i := range b {
b[i] = letterRunes[seededRand.Intn(l)]
}
return "-token-" + string(b)
}