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operator.go
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operator.go
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package kotsadm
import (
"bytes"
"context"
"github.com/pkg/errors"
kotsv1beta1 "github.com/replicatedhq/kots/kotskinds/apis/kots/v1beta1"
kotsadmobjects "github.com/replicatedhq/kots/pkg/kotsadm/objects"
"github.com/replicatedhq/kots/pkg/kotsadm/types"
rbacv1 "k8s.io/api/rbac/v1"
kuberneteserrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
)
func getOperatorYAML(deployOptions types.DeployOptions) (map[string][]byte, error) {
docs := map[string][]byte{}
s := json.NewYAMLSerializer(json.DefaultMetaFactory, scheme.Scheme, scheme.Scheme)
var role bytes.Buffer
if err := s.Encode(kotsadmobjects.OperatorRole(deployOptions.Namespace), &role); err != nil {
return nil, errors.Wrap(err, "failed to marshal operator role")
}
docs["operator-role.yaml"] = role.Bytes()
var roleBinding bytes.Buffer
if err := s.Encode(kotsadmobjects.OperatorRoleBinding(deployOptions.Namespace, deployOptions.Namespace), &roleBinding); err != nil {
return nil, errors.Wrap(err, "failed to marshal operator role binding")
}
docs["operator-rolebinding.yaml"] = roleBinding.Bytes()
var serviceAccount bytes.Buffer
if err := s.Encode(kotsadmobjects.OperatorServiceAccount(deployOptions.Namespace), &serviceAccount); err != nil {
return nil, errors.Wrap(err, "failed to marshal operator service account")
}
docs["operator-serviceaccount.yaml"] = serviceAccount.Bytes()
var deployment bytes.Buffer
if err := s.Encode(kotsadmobjects.OperatorDeployment(deployOptions), &deployment); err != nil {
return nil, errors.Wrap(err, "failed to marshal operator deployment")
}
docs["operator-deployment.yaml"] = deployment.Bytes()
return docs, nil
}
func ensureOperator(deployOptions types.DeployOptions, clientset *kubernetes.Clientset) error {
if deployOptions.EnsureRBAC {
if err := ensureOperatorRBAC(deployOptions, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator rbac")
}
}
if err := ensureOperatorDeployment(deployOptions, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator deployment")
}
return nil
}
func ensureOperatorClusterRBAC(deployOptions types.DeployOptions, clientset *kubernetes.Clientset) error {
err := ensureOperatorClusterRole(clientset)
if err != nil {
return errors.Wrap(err, "failed to ensure operator cluster role")
}
if err := ensureOperatorClusterRoleBinding(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator cluster role binding")
}
if err := ensureOperatorServiceAccount(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator service account")
}
return nil
}
func ensureOperatorRBAC(deployOptions types.DeployOptions, clientset *kubernetes.Clientset) error {
shouldBeClusterScoped, err := isOperatorClusterScoped(deployOptions.ApplicationMetadata)
if err != nil {
return errors.Wrap(err, "failed to check if operator should be cluster scoped")
}
// if this is cluster scoped, it's easy... create everything as a cluster role and cluster role binding
// with pretty open permissions
if shouldBeClusterScoped {
return ensureOperatorClusterRBAC(deployOptions, clientset)
}
// we want to ensure that the principle of least privilege is applied.
// so we will create our role and rolebinding
// and then create a role and role binding PER namespace that the application
// wants... everthing will be linked to the same service account
err = ensureOperatorRole(deployOptions.Namespace, clientset)
if err != nil {
return errors.Wrap(err, "failed to ensure operator role")
}
if err := ensureOperatorRoleBinding(deployOptions.Namespace, deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator role binding")
}
decode := scheme.Codecs.UniversalDeserializer().Decode
obj, gvk, err := decode(deployOptions.ApplicationMetadata, nil, nil)
if err != nil {
return errors.Wrap(err, "failed to decode application metadata")
}
if gvk.Group != "kots.io" || gvk.Version != "v1beta1" || gvk.Kind != "Application" {
return errors.New("application metadata contained unepxected gvk")
}
application := obj.(*kotsv1beta1.Application)
for _, additionalNamespace := range application.Spec.AdditionalNamespaces {
if err = ensureOperatorRole(additionalNamespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator additional namespace role")
}
if err = ensureOperatorRoleBinding(additionalNamespace, deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator additional namespace role binding")
}
}
if err := ensureOperatorServiceAccount(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure operator service account")
}
return nil
}
func ensureOperatorClusterRole(clientset *kubernetes.Clientset) error {
_, err := clientset.RbacV1().ClusterRoles().Create(context.TODO(), kotsadmobjects.OperatorClusterRole(), metav1.CreateOptions{})
if err == nil || kuberneteserrors.IsAlreadyExists(err) {
return nil
}
return errors.Wrap(err, "failed to create cluster role")
}
func ensureOperatorRole(namespace string, clientset *kubernetes.Clientset) error {
_, err := clientset.RbacV1().Roles(namespace).Create(context.TODO(), kotsadmobjects.OperatorRole(namespace), metav1.CreateOptions{})
if err == nil || kuberneteserrors.IsAlreadyExists(err) {
return nil
}
return errors.Wrap(err, "failed to create role")
}
func ensureOperatorClusterRoleBinding(serviceAccountNamespace string, clientset *kubernetes.Clientset) error {
clusterRoleBinding, err := clientset.RbacV1().ClusterRoleBindings().Get(context.TODO(), "kotsadm-operator-rolebinding", metav1.GetOptions{})
if kuberneteserrors.IsNotFound(err) {
_, err := clientset.RbacV1().ClusterRoleBindings().Create(context.TODO(), kotsadmobjects.OperatorClusterRoleBinding(serviceAccountNamespace), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create cluster rolebinding")
}
return nil
} else if err != nil {
return errors.Wrap(err, "failed to get cluster rolebinding")
}
for _, subject := range clusterRoleBinding.Subjects {
if subject.Namespace == serviceAccountNamespace && subject.Name == "kotsadm-operator" && subject.Kind == "ServiceAccount" {
return nil
}
}
clusterRoleBinding.Subjects = append(clusterRoleBinding.Subjects, rbacv1.Subject{
Kind: "ServiceAccount",
Name: "kotsadm-operator",
Namespace: serviceAccountNamespace,
})
_, err = clientset.RbacV1().ClusterRoleBindings().Update(context.TODO(), clusterRoleBinding, metav1.UpdateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create cluster rolebinding")
}
return nil
}
func ensureOperatorRoleBinding(namespace string, subjectNamespace string, clientset *kubernetes.Clientset) error {
_, err := clientset.RbacV1().RoleBindings(namespace).Create(context.TODO(), kotsadmobjects.OperatorRoleBinding(namespace, subjectNamespace), metav1.CreateOptions{})
if err != nil && !kuberneteserrors.IsAlreadyExists(err) {
return errors.Wrap(err, "failed to create rolebinding")
}
return nil
}
func ensureOperatorServiceAccount(namespace string, clientset *kubernetes.Clientset) error {
_, err := clientset.CoreV1().ServiceAccounts(namespace).Get(context.TODO(), "kotsadm-operator", metav1.GetOptions{})
if err != nil {
if !kuberneteserrors.IsNotFound(err) {
return errors.Wrap(err, "failed to get serviceaccount")
}
_, err := clientset.CoreV1().ServiceAccounts(namespace).Create(context.TODO(), kotsadmobjects.OperatorServiceAccount(namespace), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create serviceaccount")
}
}
return nil
}
func ensureOperatorDeployment(deployOptions types.DeployOptions, clientset *kubernetes.Clientset) error {
existingDeployment, err := clientset.AppsV1().Deployments(deployOptions.Namespace).Get(context.TODO(), "kotsadm-operator", metav1.GetOptions{})
if err != nil {
if !kuberneteserrors.IsNotFound(err) {
return errors.Wrap(err, "failed to get existing deployment")
}
_, err = clientset.AppsV1().Deployments(deployOptions.Namespace).Create(context.TODO(), kotsadmobjects.OperatorDeployment(deployOptions), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create deployment")
}
return nil
}
if err = kotsadmobjects.UpdateOperatorDeployment(existingDeployment, deployOptions); err != nil {
return errors.Wrap(err, "failed to merge deployment")
}
_, err = clientset.AppsV1().Deployments(deployOptions.Namespace).Update(context.TODO(), existingDeployment, metav1.UpdateOptions{})
if err != nil {
return errors.Wrap(err, "failed to update operator deployment")
}
return nil
}
func isOperatorClusterScoped(applicationMetadata []byte) (bool, error) {
if len(applicationMetadata) == 0 {
return true, nil
}
decode := scheme.Codecs.UniversalDeserializer().Decode
obj, gvk, err := decode(applicationMetadata, nil, nil)
if err != nil {
return false, errors.Wrap(err, "failed to decode application metadata")
}
if gvk.Group != "kots.io" || gvk.Version != "v1beta1" || gvk.Kind != "Application" {
return false, errors.New("application metadata contained unepxected gvk")
}
application := obj.(*kotsv1beta1.Application)
// An application can request cluster scope privileges quite simply
if !application.Spec.RequireMinimalRBACPrivileges {
return true, nil
}
for _, additionalNamespace := range application.Spec.AdditionalNamespaces {
if additionalNamespace == "*" {
return true, nil
}
}
return false, nil
}