/
conversion.go
331 lines (298 loc) · 11.7 KB
/
conversion.go
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package rbacconversion
import (
"fmt"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/conversion"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/sets"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/apis/rbac"
authorizationapi "github.com/openshift/origin/pkg/authorization/apis/authorization"
"github.com/openshift/origin/pkg/user/apis/user/validation"
)
var (
SchemeBuilder = runtime.NewSchemeBuilder(addConversionFuncs)
AddToScheme = SchemeBuilder.AddToScheme
)
// reconcileProtectAnnotation is the name of an annotation which prevents reconciliation if set to "true"
const reconcileProtectAnnotation = "openshift.io/reconcile-protect"
func addConversionFuncs(scheme *runtime.Scheme) error {
if err := scheme.AddConversionFuncs(
Convert_authorization_ClusterRole_To_rbac_ClusterRole,
Convert_authorization_Role_To_rbac_Role,
Convert_authorization_ClusterRoleBinding_To_rbac_ClusterRoleBinding,
Convert_authorization_RoleBinding_To_rbac_RoleBinding,
Convert_rbac_ClusterRole_To_authorization_ClusterRole,
Convert_rbac_Role_To_authorization_Role,
Convert_rbac_ClusterRoleBinding_To_authorization_ClusterRoleBinding,
Convert_rbac_RoleBinding_To_authorization_RoleBinding,
); err != nil { // If one of the conversion functions is malformed, detect it immediately.
return err
}
return nil
}
func Convert_authorization_ClusterRole_To_rbac_ClusterRole(in *authorizationapi.ClusterRole, out *rbac.ClusterRole, _ conversion.Scope) error {
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_authorization_Annotations_To_rbac_Annotations(in.Annotations)
out.Rules = Convert_api_PolicyRules_To_rbac_PolicyRules(in.Rules)
out.AggregationRule = in.AggregationRule.DeepCopy()
return nil
}
func Convert_authorization_Role_To_rbac_Role(in *authorizationapi.Role, out *rbac.Role, _ conversion.Scope) error {
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_authorization_Annotations_To_rbac_Annotations(in.Annotations)
out.Rules = Convert_api_PolicyRules_To_rbac_PolicyRules(in.Rules)
return nil
}
func Convert_authorization_ClusterRoleBinding_To_rbac_ClusterRoleBinding(in *authorizationapi.ClusterRoleBinding, out *rbac.ClusterRoleBinding, _ conversion.Scope) error {
if len(in.RoleRef.Namespace) != 0 {
return fmt.Errorf("invalid origin cluster role binding %s: attempts to reference role in namespace %q instead of cluster scope", in.Name, in.RoleRef.Namespace)
}
var err error
if out.Subjects, err = convert_api_Subjects_To_rbac_Subjects(in.Subjects); err != nil {
return err
}
out.RoleRef = convert_api_RoleRef_To_rbac_RoleRef(&in.RoleRef)
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_authorization_Annotations_To_rbac_Annotations(in.Annotations)
return nil
}
func Convert_authorization_RoleBinding_To_rbac_RoleBinding(in *authorizationapi.RoleBinding, out *rbac.RoleBinding, _ conversion.Scope) error {
if len(in.RoleRef.Namespace) != 0 && in.RoleRef.Namespace != in.Namespace {
return fmt.Errorf("invalid origin role binding %s: attempts to reference role in namespace %q instead of current namespace %q", in.Name, in.RoleRef.Namespace, in.Namespace)
}
var err error
if out.Subjects, err = convert_api_Subjects_To_rbac_Subjects(in.Subjects); err != nil {
return err
}
out.RoleRef = convert_api_RoleRef_To_rbac_RoleRef(&in.RoleRef)
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_authorization_Annotations_To_rbac_Annotations(in.Annotations)
return nil
}
func Convert_api_PolicyRules_To_rbac_PolicyRules(in []authorizationapi.PolicyRule) []rbac.PolicyRule {
rules := make([]rbac.PolicyRule, 0, len(in))
for _, rule := range in {
// Origin's authorizer's RuleMatches func ignores rules that have AttributeRestrictions.
// Since we know this rule will never be respected in Origin, we do not preserve it during conversion.
if rule.AttributeRestrictions != nil {
continue
}
// We need to split this rule into multiple rules for RBAC
if isResourceRule(&rule) && isNonResourceRule(&rule) {
r1 := rbac.PolicyRule{
Verbs: rule.Verbs.List(),
APIGroups: rule.APIGroups,
Resources: rule.Resources.List(),
ResourceNames: rule.ResourceNames.List(),
}
r2 := rbac.PolicyRule{
Verbs: rule.Verbs.List(),
NonResourceURLs: rule.NonResourceURLs.List(),
}
rules = append(rules, r1, r2)
} else {
r := rbac.PolicyRule{
APIGroups: rule.APIGroups,
Verbs: rule.Verbs.List(),
Resources: rule.Resources.List(),
ResourceNames: rule.ResourceNames.List(),
NonResourceURLs: rule.NonResourceURLs.List(),
}
rules = append(rules, r)
}
}
return rules
}
func isResourceRule(rule *authorizationapi.PolicyRule) bool {
return len(rule.APIGroups) > 0 || len(rule.Resources) > 0 || len(rule.ResourceNames) > 0
}
func isNonResourceRule(rule *authorizationapi.PolicyRule) bool {
return len(rule.NonResourceURLs) > 0
}
func convert_api_Subjects_To_rbac_Subjects(in []api.ObjectReference) ([]rbac.Subject, error) {
subjects := make([]rbac.Subject, 0, len(in))
for _, subject := range in {
s := rbac.Subject{
Name: subject.Name,
}
switch subject.Kind {
case authorizationapi.ServiceAccountKind:
s.Kind = rbac.ServiceAccountKind
s.Namespace = subject.Namespace
case authorizationapi.UserKind, authorizationapi.SystemUserKind:
s.APIGroup = rbac.GroupName
s.Kind = rbac.UserKind
case authorizationapi.GroupKind, authorizationapi.SystemGroupKind:
s.APIGroup = rbac.GroupName
s.Kind = rbac.GroupKind
default:
return nil, fmt.Errorf("invalid kind for origin subject: %q", subject.Kind)
}
subjects = append(subjects, s)
}
return subjects, nil
}
func convert_api_RoleRef_To_rbac_RoleRef(in *api.ObjectReference) rbac.RoleRef {
return rbac.RoleRef{
APIGroup: rbac.GroupName,
Kind: getRBACRoleRefKind(in.Namespace),
Name: in.Name,
}
}
// Infers the scope of the kind based on the presence of the namespace
func getRBACRoleRefKind(namespace string) string {
kind := "ClusterRole"
if len(namespace) != 0 {
kind = "Role"
}
return kind
}
func Convert_rbac_ClusterRole_To_authorization_ClusterRole(in *rbac.ClusterRole, out *authorizationapi.ClusterRole, _ conversion.Scope) error {
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_rbac_Annotations_To_authorization_Annotations(in.Annotations)
out.Rules = Convert_rbac_PolicyRules_To_authorization_PolicyRules(in.Rules)
out.AggregationRule = in.AggregationRule.DeepCopy()
return nil
}
func Convert_rbac_Role_To_authorization_Role(in *rbac.Role, out *authorizationapi.Role, _ conversion.Scope) error {
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_rbac_Annotations_To_authorization_Annotations(in.Annotations)
out.Rules = Convert_rbac_PolicyRules_To_authorization_PolicyRules(in.Rules)
return nil
}
func Convert_rbac_ClusterRoleBinding_To_authorization_ClusterRoleBinding(in *rbac.ClusterRoleBinding, out *authorizationapi.ClusterRoleBinding, _ conversion.Scope) error {
var err error
if out.Subjects, err = Convert_rbac_Subjects_To_authorization_Subjects(in.Subjects); err != nil {
return err
}
if out.RoleRef, err = convert_rbac_RoleRef_To_authorization_RoleRef(&in.RoleRef, ""); err != nil {
return err
}
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_rbac_Annotations_To_authorization_Annotations(in.Annotations)
return nil
}
func Convert_rbac_RoleBinding_To_authorization_RoleBinding(in *rbac.RoleBinding, out *authorizationapi.RoleBinding, _ conversion.Scope) error {
var err error
if out.Subjects, err = Convert_rbac_Subjects_To_authorization_Subjects(in.Subjects); err != nil {
return err
}
if out.RoleRef, err = convert_rbac_RoleRef_To_authorization_RoleRef(&in.RoleRef, in.Namespace); err != nil {
return err
}
out.ObjectMeta = in.ObjectMeta
out.Annotations = convert_rbac_Annotations_To_authorization_Annotations(in.Annotations)
return nil
}
func Convert_rbac_Subjects_To_authorization_Subjects(in []rbac.Subject) ([]api.ObjectReference, error) {
subjects := make([]api.ObjectReference, 0, len(in))
for _, subject := range in {
s := api.ObjectReference{
Name: subject.Name,
}
switch subject.Kind {
case rbac.ServiceAccountKind:
s.Kind = authorizationapi.ServiceAccountKind
s.Namespace = subject.Namespace
case rbac.UserKind:
s.Kind = determineUserKind(subject.Name)
case rbac.GroupKind:
s.Kind = determineGroupKind(subject.Name)
default:
return nil, fmt.Errorf("invalid kind for rbac subject: %q", subject.Kind)
}
subjects = append(subjects, s)
}
return subjects, nil
}
// rbac.RoleRef has no namespace field since that can be inferred from the kind of referenced role.
// The Origin role ref (api.ObjectReference) requires its namespace value to match the binding's namespace
// for a binding to a role. For a binding to a cluster role, the namespace value must be the empty string.
// Thus we have to explicitly provide the namespace value as a parameter and use it based on the role's kind.
func convert_rbac_RoleRef_To_authorization_RoleRef(in *rbac.RoleRef, namespace string) (api.ObjectReference, error) {
switch in.Kind {
case "ClusterRole":
return api.ObjectReference{Name: in.Name}, nil
case "Role":
return api.ObjectReference{Name: in.Name, Namespace: namespace}, nil
default:
return api.ObjectReference{}, fmt.Errorf("invalid kind %q for rbac role ref %q", in.Kind, in.Name)
}
}
func Convert_rbac_PolicyRules_To_authorization_PolicyRules(in []rbac.PolicyRule) []authorizationapi.PolicyRule {
rules := make([]authorizationapi.PolicyRule, 0, len(in))
for _, rule := range in {
r := authorizationapi.PolicyRule{
APIGroups: rule.APIGroups,
Verbs: sets.NewString(rule.Verbs...),
Resources: sets.NewString(rule.Resources...),
ResourceNames: sets.NewString(rule.ResourceNames...),
NonResourceURLs: sets.NewString(rule.NonResourceURLs...),
}
rules = append(rules, r)
}
return rules
}
func Convert_rbacv1_PolicyRules_To_authorization_PolicyRules(in []rbacv1.PolicyRule) []authorizationapi.PolicyRule {
rules := make([]authorizationapi.PolicyRule, 0, len(in))
for _, rule := range in {
r := authorizationapi.PolicyRule{
APIGroups: rule.APIGroups,
Verbs: sets.NewString(rule.Verbs...),
Resources: sets.NewString(rule.Resources...),
ResourceNames: sets.NewString(rule.ResourceNames...),
NonResourceURLs: sets.NewString(rule.NonResourceURLs...),
}
rules = append(rules, r)
}
return rules
}
func copyMapExcept(in map[string]string, except string) map[string]string {
out := map[string]string{}
for k, v := range in {
if k != except {
out[k] = v
}
}
return out
}
var stringBool = sets.NewString("true", "false")
func convert_authorization_Annotations_To_rbac_Annotations(in map[string]string) map[string]string {
if value, ok := in[reconcileProtectAnnotation]; ok && stringBool.Has(value) {
out := copyMapExcept(in, reconcileProtectAnnotation)
if value == "true" {
out[rbac.AutoUpdateAnnotationKey] = "false"
} else {
out[rbac.AutoUpdateAnnotationKey] = "true"
}
return out
}
return in
}
func convert_rbac_Annotations_To_authorization_Annotations(in map[string]string) map[string]string {
if value, ok := in[rbac.AutoUpdateAnnotationKey]; ok && stringBool.Has(value) {
out := copyMapExcept(in, rbac.AutoUpdateAnnotationKey)
if value == "true" {
out[reconcileProtectAnnotation] = "false"
} else {
out[reconcileProtectAnnotation] = "true"
}
return out
}
return in
}
func determineUserKind(user string) string {
kind := authorizationapi.UserKind
if len(validation.ValidateUserName(user, false)) != 0 {
kind = authorizationapi.SystemUserKind
}
return kind
}
func determineGroupKind(group string) string {
kind := authorizationapi.GroupKind
if len(validation.ValidateGroupName(group, false)) != 0 {
kind = authorizationapi.SystemGroupKind
}
return kind
}