/
binding.go
295 lines (266 loc) · 6.99 KB
/
binding.go
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package binding
import (
"context"
"encoding/json"
"errors"
"fmt"
"os"
"path"
"regexp"
"sort"
"strconv"
"time"
rbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
type Kind string
var (
KindRoleBinding Kind = "RoleBinding"
KindClusterRoleBinding Kind = "ClusterRoleBinding"
)
type RawBindings struct {
RoleBindings []rbacv1.RoleBinding
ClusterRoleBindings []rbacv1.ClusterRoleBinding
}
var errInvalidName = errors.New("invalid name")
var regexAliUserIdentity = regexp.MustCompile(`^(\d+)(-\d+)?$`)
func (bs *RawBindings) AliUserBindings() RawBindings {
filtered := RawBindings{}
for _, b := range bs.RoleBindings {
if isAliUserRoleBinding(b) {
filtered.RoleBindings = append(filtered.RoleBindings, b)
}
}
for _, b := range bs.ClusterRoleBindings {
if isAliUserClusterRoleBinding(b) {
filtered.ClusterRoleBindings = append(filtered.ClusterRoleBindings, b)
}
}
return filtered
}
type Binding struct {
Kind Kind
Name string
Namespace string
SubjectName string
AliUid int64
}
func (bs *RawBindings) SortByUid() []Binding {
var bindList []Binding
for _, b := range bs.RoleBindings {
for _, sub := range b.Subjects {
bindList = append(bindList, Binding{
Kind: KindRoleBinding,
Name: b.Name,
Namespace: b.Namespace,
SubjectName: sub.Name,
AliUid: 0,
})
}
}
for _, b := range bs.ClusterRoleBindings {
for _, sub := range b.Subjects {
bindList = append(bindList, Binding{
Kind: KindClusterRoleBinding,
Name: b.Name,
Namespace: b.Namespace,
SubjectName: sub.Name,
AliUid: 0,
})
}
}
for i, b := range bindList {
b := b
uid, err := getAliUidFromSubjectName(b.SubjectName)
if err != nil || uid == 0 {
continue
}
b.AliUid = uid
bindList[i] = b
}
sort.Slice(bindList, func(i, j int) bool {
return bindList[i].AliUid < bindList[j].AliUid
})
return bindList
}
func ListBindings(ctx context.Context, kube kubernetes.Interface) (*RawBindings, error) {
roleBindings, err := listRoleBindings(ctx, kube)
if err != nil {
return nil, err
}
clusterRoleBindings, err := listClusterRoleBindings(ctx, kube)
if err != nil {
return nil, err
}
return &RawBindings{
RoleBindings: roleBindings.Items,
ClusterRoleBindings: clusterRoleBindings.Items,
}, nil
}
func isAliUserRoleBinding(binding rbacv1.RoleBinding) bool {
for _, sub := range binding.Subjects {
if isAliUserSubject(sub) {
return true
}
}
return false
}
func isAliUserClusterRoleBinding(binding rbacv1.ClusterRoleBinding) bool {
for _, sub := range binding.Subjects {
if isAliUserSubject(sub) {
return true
}
}
return false
}
func getAliUidFromSubjectName(name string) (int64, error) {
matches := regexAliUserIdentity.FindAllStringSubmatch(name, -1)
if len(matches) < 1 {
return 0, errInvalidName
}
match := matches[0]
if len(match) < 2 {
return 0, errInvalidName
}
uid, err := strconv.Atoi(match[1])
if err != nil {
return 0, err
}
return int64(uid), nil
}
func isAliUserSubject(subject rbacv1.Subject) bool {
if subject.Kind != rbacv1.UserKind {
return false
}
if subject.APIGroup != rbacv1.GroupName {
return false
}
return regexAliUserIdentity.MatchString(subject.Name)
}
func listRoleBindings(ctx context.Context, kube kubernetes.Interface) (*rbacv1.RoleBindingList, error) {
continueMark := ""
allList := &rbacv1.RoleBindingList{Items: []rbacv1.RoleBinding{}}
i := 0
limit := int64(500)
maxI := limit * 1000
for {
opt := metav1.ListOptions{
Limit: limit,
Continue: continueMark,
//ResourceVersion: "0",
}
ret, err := kube.RbacV1().RoleBindings("").List(ctx, opt)
if err != nil {
return nil, err
}
allList.Items = append(allList.Items, ret.Items...)
continueMark = ret.Continue
if continueMark == "" || i > int(maxI/limit) {
break
}
i++
time.Sleep(time.Millisecond * 500)
}
return allList, nil
}
func listClusterRoleBindings(ctx context.Context, kube kubernetes.Interface) (*rbacv1.ClusterRoleBindingList, error) {
continueMark := ""
allList := &rbacv1.ClusterRoleBindingList{Items: []rbacv1.ClusterRoleBinding{}}
i := 0
limit := int64(500)
maxI := limit * 1000
for {
opt := metav1.ListOptions{
Limit: limit,
Continue: continueMark,
//ResourceVersion: "0",
}
ret, err := kube.RbacV1().ClusterRoleBindings().List(ctx, opt)
if err != nil {
return nil, err
}
allList.Items = append(allList.Items, ret.Items...)
continueMark = ret.Continue
if continueMark == "" || i > int(maxI/limit) {
break
}
i++
time.Sleep(time.Millisecond * 500)
}
return allList, nil
}
func SaveBindingToFile(ctx context.Context, dir string, b Binding, client kubernetes.Interface) (string, error) {
var r interface{}
var err error
switch b.Kind {
case KindRoleBinding:
r, err = getRoleBinding(ctx, b, client)
if err != nil {
return "", err
}
case KindClusterRoleBinding:
r, err = getClusterRoleBinding(ctx, b, client)
if err != nil {
return "", err
}
}
if _, err := os.Stat(dir); os.IsNotExist(err) {
if err := os.MkdirAll(dir, 0750); err != nil {
return "", fmt.Errorf("mkdir %s: %w", dir, err)
}
}
filePath := path.Join(dir, fmt.Sprintf("%s-%s-%s.json", b.Kind, b.Namespace, b.Name))
data, err := json.Marshal(r)
if err != nil {
return "", err
}
if err := os.WriteFile(filePath, data, 0600); err != nil {
return "", err
}
return filePath, nil
}
func RemoveBinding(ctx context.Context, b Binding, client kubernetes.Interface) error {
switch b.Kind {
case KindRoleBinding:
return removeRoleBinding(ctx, b, client)
case KindClusterRoleBinding:
return removeClusterRoleBinding(ctx, b, client)
}
return nil
}
func getClusterRoleBinding(ctx context.Context, b Binding, client kubernetes.Interface) (*rbacv1.ClusterRoleBinding, error) {
obj, err := client.RbacV1().ClusterRoleBindings().Get(ctx, b.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
obj.APIVersion = "rbac.authorization.k8s.io/v1"
obj.Kind = "ClusterRoleBinding"
return obj, err
}
func getRoleBinding(ctx context.Context, b Binding, client kubernetes.Interface) (*rbacv1.RoleBinding, error) {
obj, err := client.RbacV1().RoleBindings(b.Namespace).Get(ctx, b.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
obj.APIVersion = "rbac.authorization.k8s.io/v1"
obj.Kind = "RoleBinding"
return obj, err
}
func removeClusterRoleBinding(ctx context.Context, b Binding, client kubernetes.Interface) error {
err := client.RbacV1().ClusterRoleBindings().Delete(ctx, b.Name, metav1.DeleteOptions{})
return err
}
func removeRoleBinding(ctx context.Context, b Binding, client kubernetes.Interface) error {
err := client.RbacV1().RoleBindings(b.Namespace).Delete(ctx, b.Name, metav1.DeleteOptions{})
return err
}
func (b Binding) String() string {
switch b.Kind {
case KindRoleBinding:
return fmt.Sprintf("%s/%s/%s", b.Kind, b.Namespace, b.Name)
case KindClusterRoleBinding:
return fmt.Sprintf("%s/-/%s", b.Kind, b.Name)
}
return fmt.Sprintf("%#v", b)
}