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serviceaccount.go
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serviceaccount.go
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// Copyright 2017 Istio Authors
//
// 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 kube
import (
"fmt"
"reflect"
"time"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"istio.io/istio/pkg/log"
"istio.io/istio/security/pkg/pki/util"
"istio.io/istio/security/pkg/registry"
)
// ServiceAccountController monitors service account definition changes in a namespace.
// For each service account object, its SpiffeID is added to identity registry for
// whitelisting purpose.
type ServiceAccountController struct {
core corev1.CoreV1Interface
// identity registry object
reg registry.Registry
// controller for service objects
controller cache.Controller
}
// NewServiceAccountController returns a new ServiceAccountController
func NewServiceAccountController(core corev1.CoreV1Interface, namespace string, reg registry.Registry) *ServiceAccountController {
c := &ServiceAccountController{
core: core,
reg: reg,
}
LW := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return core.ServiceAccounts(namespace).List(options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return core.ServiceAccounts(namespace).Watch(options)
},
}
_, c.controller = cache.NewInformer(LW, &v1.ServiceAccount{}, time.Minute, cache.ResourceEventHandlerFuncs{
AddFunc: c.serviceAccountAdded,
DeleteFunc: c.serviceAccountDeleted,
UpdateFunc: c.serviceAccountUpdated,
})
return c
}
// Run starts the ServiceAccountController until a value is sent to stopCh.
// It should only be called once.
func (c *ServiceAccountController) Run(stopCh chan struct{}) {
go c.controller.Run(stopCh)
}
func getSpiffeID(sa *v1.ServiceAccount) string {
// borrowed from security/pkg/pki/ca/controller/secret.go:generateKeyAndCert()
return fmt.Sprintf("%s://cluster.local/ns/%s/sa/%s", util.URIScheme, sa.GetNamespace(), sa.GetName())
}
func (c *ServiceAccountController) serviceAccountAdded(obj interface{}) {
sa := obj.(*v1.ServiceAccount)
id := getSpiffeID(sa)
err := c.reg.AddMapping(id, id)
if err != nil {
log.Errorf("cannot add mapping %q -> %q to registry: %s", id, id, err.Error())
}
}
func (c *ServiceAccountController) serviceAccountDeleted(obj interface{}) {
sa := obj.(*v1.ServiceAccount)
id := getSpiffeID(sa)
err := c.reg.DeleteMapping(id, id)
if err != nil {
log.Errorf("cannot delete mapping %q to %q from registry: %s", id, id, err.Error())
}
}
func (c *ServiceAccountController) serviceAccountUpdated(oldObj, newObj interface{}) {
if oldObj == newObj || reflect.DeepEqual(oldObj, newObj) {
// Nothing is changed. The method is invoked by periodical re-sync with the apiserver.
return
}
oldSa := oldObj.(*v1.ServiceAccount)
newSa := newObj.(*v1.ServiceAccount)
// if name or namespace has changed
if oldSa.GetName() != newSa.GetName() || oldSa.GetNamespace() != newSa.GetNamespace() {
oldID := getSpiffeID(oldSa)
newID := getSpiffeID(newSa)
_ = c.reg.DeleteMapping(oldID, oldID)
_ = c.reg.AddMapping(newID, newID)
}
}