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/
policy_rule_index.go
201 lines (180 loc) · 5.72 KB
/
policy_rule_index.go
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package accesscontrol
import (
"context"
"fmt"
"hash"
"sort"
"github.com/acorn-io/baaah/pkg/router"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime/schema"
kclient "sigs.k8s.io/controller-runtime/pkg/client"
)
const (
rbacGroup = "rbac.authorization.k8s.io"
All = "*"
)
type policyRuleIndex struct {
ctx context.Context
client kclient.Reader
revisions *roleRevisionIndex
kind string
roleIndexKey string
clusterRoleIndexKey string
}
func newPolicyRuleIndex(ctx context.Context, user bool, revisions *roleRevisionIndex, router *router.Router) (*policyRuleIndex, error) {
key := "Group"
if user {
key = "User"
}
pi := &policyRuleIndex{
ctx: ctx,
kind: key,
client: router.Backend(),
clusterRoleIndexKey: "crb" + key,
roleIndexKey: "rb" + key,
revisions: revisions,
}
if err := router.Backend().IndexField(ctx, &rbacv1.ClusterRoleBinding{}, pi.clusterRoleIndexKey, pi.clusterRoleBindingBySubjectIndexer); err != nil {
return pi, nil
return nil, err
}
if err := router.Backend().IndexField(ctx, &rbacv1.RoleBinding{}, pi.clusterRoleIndexKey, pi.roleBindingBySubject); err != nil {
return pi, nil
return nil, err
}
return pi, nil
}
func (p *policyRuleIndex) clusterRoleBindingBySubjectIndexer(obj kclient.Object) (result []string) {
crb := obj.(*rbacv1.ClusterRoleBinding)
for _, subject := range crb.Subjects {
if subject.APIGroup == rbacGroup && subject.Kind == p.kind && crb.RoleRef.Kind == "ClusterRole" {
result = append(result, subject.Name)
} else if subject.APIGroup == "" && p.kind == "User" && subject.Kind == "ServiceAccount" && subject.Namespace != "" && crb.RoleRef.Kind == "ClusterRole" {
// Index is for Users and this references a service account
result = append(result, fmt.Sprintf("serviceaccount:%s:%s", subject.Namespace, subject.Name))
}
}
return
}
func (p *policyRuleIndex) roleBindingBySubject(obj kclient.Object) (result []string) {
rb := obj.(*rbacv1.RoleBinding)
for _, subject := range rb.Subjects {
if subject.APIGroup == rbacGroup && subject.Kind == p.kind {
result = append(result, subject.Name)
} else if subject.APIGroup == "" && p.kind == "User" && subject.Kind == "ServiceAccount" && subject.Namespace != "" {
// Index is for Users and this references a service account
result = append(result, fmt.Sprintf("serviceaccount:%s:%s", subject.Namespace, subject.Name))
}
}
return
}
var null = []byte{'\x00'}
func (p *policyRuleIndex) addRolesToHash(digest hash.Hash, subjectName string) {
for _, crb := range p.getClusterRoleBindings(subjectName) {
digest.Write([]byte(crb.RoleRef.Name))
digest.Write(null)
digest.Write([]byte(p.revisions.roleRevision("", crb.RoleRef.Name)))
digest.Write(null)
}
for _, rb := range p.getRoleBindings(subjectName) {
switch rb.RoleRef.Kind {
case "Role":
digest.Write([]byte(rb.RoleRef.Name))
digest.Write(null)
digest.Write([]byte(rb.Namespace))
digest.Write(null)
digest.Write([]byte(p.revisions.roleRevision(rb.Namespace, rb.RoleRef.Name)))
digest.Write(null)
case "ClusterRole":
digest.Write([]byte(rb.RoleRef.Name))
digest.Write(null)
digest.Write([]byte(rb.Namespace))
digest.Write(null)
digest.Write([]byte(p.revisions.roleRevision("", rb.RoleRef.Name)))
digest.Write(null)
}
}
}
func (p *policyRuleIndex) get(subjectName string) *AccessSet {
result := &AccessSet{}
for _, binding := range p.getRoleBindings(subjectName) {
p.addAccess(result, binding.Namespace, binding.RoleRef)
}
for _, binding := range p.getClusterRoleBindings(subjectName) {
p.addAccess(result, All, binding.RoleRef)
}
return result
}
func (p *policyRuleIndex) addAccess(accessSet *AccessSet, namespace string, roleRef rbacv1.RoleRef) {
for _, rule := range p.getRules(namespace, roleRef) {
for _, group := range rule.APIGroups {
for _, resource := range rule.Resources {
names := rule.ResourceNames
if len(names) == 0 {
names = []string{All}
}
for _, resourceName := range names {
for _, verb := range rule.Verbs {
accessSet.Add(verb,
schema.GroupResource{
Group: group,
Resource: resource,
}, Access{
Namespace: namespace,
ResourceName: resourceName,
})
}
}
}
}
}
}
func (p *policyRuleIndex) getRules(namespace string, roleRef rbacv1.RoleRef) []rbacv1.PolicyRule {
switch roleRef.Kind {
case "ClusterRole":
var role rbacv1.ClusterRole
if err := p.client.Get(p.ctx, router.Key("", roleRef.Name), &role); err != nil {
// ignore error
return nil
}
return role.Rules
case "Role":
var role rbacv1.Role
if err := p.client.Get(p.ctx, router.Key(namespace, roleRef.Name), &role); err != nil {
return nil
}
return role.Rules
}
return nil
}
func (p *policyRuleIndex) getClusterRoleBindings(subjectName string) []rbacv1.ClusterRoleBinding {
var list rbacv1.ClusterRoleBindingList
err := p.client.List(p.ctx, &list, &kclient.ListOptions{
FieldSelector: fields.SelectorFromSet(map[string]string{
p.clusterRoleIndexKey: subjectName,
}),
})
if err != nil {
return nil
}
sort.Slice(list.Items, func(i, j int) bool {
return list.Items[i].Name < list.Items[j].Name
})
return list.Items
}
func (p *policyRuleIndex) getRoleBindings(subjectName string) []rbacv1.RoleBinding {
var list rbacv1.RoleBindingList
err := p.client.List(p.ctx, &list, &kclient.ListOptions{
FieldSelector: fields.SelectorFromSet(map[string]string{
p.roleIndexKey: subjectName,
}),
})
if err != nil {
return nil
}
sort.Slice(list.Items, func(i, j int) bool {
return string(list.Items[i].UID) < string(list.Items[j].UID)
})
return list.Items
}