/
client.go
138 lines (122 loc) · 4.03 KB
/
client.go
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package client
import (
"context"
"fmt"
"os"
"os/user"
"path/filepath"
"sync"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
authorizationv1 "k8s.io/api/authorization/v1"
corev1 "k8s.io/api/core/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
ktypedclient "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/record"
)
const (
DefaultNamespace = "csi-driver-projected-resource"
DriverName = "csi-driver-projected-resource.openshift.io"
)
var (
initLock = sync.Mutex{}
kubeClient kubernetes.Interface
recorder record.EventRecorder
)
// SetClient sets the internal kubernetes client interface. Useful for testing.
func SetClient(client kubernetes.Interface) {
kubeClient = client
}
func GetRecorder() record.EventRecorder {
return recorder
}
// GetConfig creates a *rest.Config for talking to a Kubernetes apiserver.
// Otherwise will assume running in cluster and use the cluster provided kubeconfig.
//
// Config precedence
//
// * KUBECONFIG environment variable pointing at a file
//
// * In-cluster config if running in cluster
//
// * $HOME/.kube/config if exists
func GetConfig() (*rest.Config, error) {
// If an env variable is specified with the config locaiton, use that
if len(os.Getenv("KUBECONFIG")) > 0 {
return clientcmd.BuildConfigFromFlags("", os.Getenv("KUBECONFIG"))
}
// If no explicit location, try the in-cluster config
if c, err := rest.InClusterConfig(); err == nil {
return c, nil
}
// If no in-cluster config, try the default location in the user's home directory
if usr, err := user.Current(); err == nil {
if c, err := clientcmd.BuildConfigFromFlags(
"", filepath.Join(usr.HomeDir, ".kube", "config")); err == nil {
return c, nil
}
}
return nil, fmt.Errorf("could not locate a kubeconfig")
}
func initClient() error {
initLock.Lock()
defer initLock.Unlock()
if kubeClient == nil {
kubeRestConfig, err := GetConfig()
if err != nil {
return err
}
kubeClient, err = kubernetes.NewForConfig(kubeRestConfig)
if err != nil {
return err
}
}
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartRecordingToSink(&ktypedclient.EventSinkImpl{Interface: kubeClient.CoreV1().Events(DefaultNamespace)})
recorder = eventBroadcaster.NewRecorder(runtime.NewScheme(), corev1.EventSource{Component: DefaultNamespace})
return nil
}
func ExecuteSAR(shareName, podNamespace, podName, podSA string) (bool, error) {
err := initClient()
if err != nil {
return false, err
}
sarClient := kubeClient.AuthorizationV1().SubjectAccessReviews()
resourceAttributes := &authorizationv1.ResourceAttributes{
Verb: "get",
Group: "projectedresource.storage.openshift.io",
Resource: "shares",
Name: shareName,
}
sar := &authorizationv1.SubjectAccessReview{
Spec: authorizationv1.SubjectAccessReviewSpec{
ResourceAttributes: resourceAttributes,
User: fmt.Sprintf("system:serviceaccount:%s:%s", podNamespace, podSA),
}}
resp, err := sarClient.Create(context.TODO(), sar, metav1.CreateOptions{})
if err == nil && resp != nil {
if resp.Status.Allowed {
return true, nil
}
return false, status.Errorf(codes.PermissionDenied,
"subjectaccessreviews share %s podNamespace %s podName %s podSA %s returned forbidden",
shareName, podNamespace, podName, podSA)
}
if kerrors.IsForbidden(err) {
return false, status.Errorf(codes.PermissionDenied,
"subjectaccessreviews share %s podNamespace %s podName %s podSA %s returned forbidden: %s",
shareName, podNamespace, podName, podSA, err.Error())
}
return false, status.Errorf(codes.Internal,
"subjectaccessreviews share %s podNamespace %s podName %s podSA %s returned error: %s",
shareName, podNamespace, podName, podSA, err.Error())
}
func GetPod(namespace, name string) (*corev1.Pod, error) {
initClient()
return kubeClient.CoreV1().Pods(namespace).Get(context.TODO(), name, metav1.GetOptions{})
}