/
rbac_policy.go
212 lines (180 loc) · 4.83 KB
/
rbac_policy.go
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package dao
import (
"context"
"fmt"
"github.com/kswapd/k13s/internal"
"github.com/kswapd/k13s/internal/client"
"github.com/kswapd/k13s/internal/render"
"github.com/rs/zerolog/log"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
)
var (
_ Accessor = (*Policy)(nil)
_ Nuker = (*Policy)(nil)
)
// Policy represent rbac policy.
type Policy struct {
Resource
}
// List returns available policies.
func (p *Policy) List(ctx context.Context, ns string) ([]runtime.Object, error) {
kind, ok := ctx.Value(internal.KeySubjectKind).(string)
if !ok {
return nil, fmt.Errorf("expecting a context subject kind")
}
name, ok := ctx.Value(internal.KeySubjectName).(string)
if !ok {
return nil, fmt.Errorf("expecting a context subject name")
}
crps, err := p.loadClusterRoleBinding(kind, name)
if err != nil {
return nil, err
}
rps, err := p.loadRoleBinding(kind, name)
if err != nil {
return nil, err
}
oo := make([]runtime.Object, 0, len(crps)+len(rps))
for _, p := range crps {
oo = append(oo, p)
}
for _, p := range rps {
oo = append(oo, p)
}
return oo, nil
}
func (p *Policy) loadClusterRoleBinding(kind, name string) (render.Policies, error) {
crbs, err := fetchClusterRoleBindings(p.Factory)
if err != nil {
return nil, err
}
var nn []string
for _, crb := range crbs {
for _, s := range crb.Subjects {
if s.Kind == kind && s.Name == name {
nn = append(nn, crb.RoleRef.Name)
}
}
}
crs, err := p.fetchClusterRoles()
if err != nil {
return nil, err
}
rows := make(render.Policies, 0, len(nn))
for _, cr := range crs {
if !inList(nn, cr.Name) {
continue
}
rows = append(rows, parseRules("*", "CR:"+cr.Name, cr.Rules)...)
}
return rows, nil
}
func (p *Policy) loadRoleBinding(kind, name string) (render.Policies, error) {
ss, err := p.fetchRoleBindingSubjects(kind, name)
if err != nil {
return nil, err
}
crs, err := p.fetchClusterRoles()
if err != nil {
return nil, err
}
rows := make(render.Policies, 0, len(crs))
for _, cr := range crs {
if !inList(ss, "ClusterRole:"+cr.Name) {
continue
}
rows = append(rows, parseRules("*", "CR:"+cr.Name, cr.Rules)...)
}
ros, err := p.fetchRoles()
if err != nil {
return nil, err
}
for _, ro := range ros {
if !inList(ss, "Role:"+ro.Name) {
continue
}
log.Debug().Msgf("Loading rules for role %q:%q", ro.Namespace, ro.Name)
rows = append(rows, parseRules(ro.Namespace, "RO:"+ro.Name, ro.Rules)...)
}
return rows, nil
}
func fetchClusterRoleBindings(f Factory) ([]rbacv1.ClusterRoleBinding, error) {
oo, err := f.List(crbGVR, client.ClusterScope, false, labels.Everything())
if err != nil {
return nil, err
}
crbs := make([]rbacv1.ClusterRoleBinding, len(oo))
for i, o := range oo {
var crb rbacv1.ClusterRoleBinding
if e := runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &crb); e != nil {
return nil, e
}
crbs[i] = crb
}
return crbs, nil
}
func fetchRoleBindings(f Factory) ([]rbacv1.RoleBinding, error) {
oo, err := f.List(rbGVR, client.ClusterScope, false, labels.Everything())
if err != nil {
return nil, err
}
rbs := make([]rbacv1.RoleBinding, 0, len(oo))
for _, o := range oo {
var rb rbacv1.RoleBinding
if e := runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &rb); e != nil {
return nil, e
}
rbs = append(rbs, rb)
}
return rbs, nil
}
func (p *Policy) fetchRoleBindingSubjects(kind, name string) ([]string, error) {
rbs, err := fetchRoleBindings(p.Factory)
if err != nil {
return nil, err
}
ss := make([]string, 0, len(rbs))
for _, rb := range rbs {
for _, s := range rb.Subjects {
if s.Kind == kind && s.Name == name {
ss = append(ss, rb.RoleRef.Kind+":"+rb.Name)
}
}
}
return ss, nil
}
func (p *Policy) fetchClusterRoles() ([]rbacv1.ClusterRole, error) {
const gvr = "rbac.authorization.k8s.io/v1/clusterroles"
oo, err := p.GetFactory().List(gvr, client.ClusterScope, false, labels.Everything())
if err != nil {
return nil, err
}
crs := make([]rbacv1.ClusterRole, len(oo))
for i, o := range oo {
var cr rbacv1.ClusterRole
if e := runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &cr); e != nil {
return nil, err
}
crs[i] = cr
}
return crs, nil
}
func (p *Policy) fetchRoles() ([]rbacv1.Role, error) {
const gvr = "rbac.authorization.k8s.io/v1/roles"
oo, err := p.GetFactory().List(gvr, client.AllNamespaces, false, labels.Everything())
if err != nil {
return nil, err
}
rr := make([]rbacv1.Role, len(oo))
for i, o := range oo {
var ro rbacv1.Role
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &ro); err != nil {
return nil, err
}
rr[i] = ro
}
return rr, nil
}