func (r *RBACAuthorizer) Authorize(attr authorizer.Attributes) error {
if r.superUser != "" && attr.GetUserName() == r.superUser {
return nil
}
userInfo := &user.DefaultInfo{
Name: attr.GetUserName(),
Groups: attr.GetGroups(),
}
ctx := api.WithNamespace(api.WithUser(api.NewContext(), userInfo), attr.GetNamespace())
// Frame the authorization request as a privilege escalation check.
var requestedRule rbac.PolicyRule
if attr.IsResourceRequest() {
requestedRule = rbac.PolicyRule{
Verbs: []string{attr.GetVerb()},
APIGroups: []string{attr.GetAPIGroup()}, // TODO(ericchiang): add api version here too?
Resources: []string{attr.GetResource()},
ResourceNames: []string{attr.GetName()},
}
} else {
requestedRule = rbac.PolicyRule{
NonResourceURLs: []string{attr.GetPath()},
}
}
return validation.ConfirmNoEscalation(ctx, r.authorizationRuleResolver, []rbac.PolicyRule{requestedRule})
}
func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
if u, ok := api.UserFrom(ctx); ok {
if s.superUser != "" && u.GetName() == s.superUser {
return s.StandardStorage.Create(ctx, obj)
}
// system:masters is special because the API server uses it for privileged loopback connections
// therefore we know that a member of system:masters can always do anything
for _, group := range u.GetGroups() {
if group == user.SystemPrivilegedGroup {
return s.StandardStorage.Create(ctx, obj)
}
}
}
clusterRoleBinding := obj.(*rbac.ClusterRoleBinding)
rules, err := s.ruleResolver.GetRoleReferenceRules(ctx, clusterRoleBinding.RoleRef, clusterRoleBinding.Namespace)
if err != nil {
return nil, err
}
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, clusterRoleBinding.Name, err)
}
return s.StandardStorage.Create(ctx, obj)
}
func (r *RBACAuthorizer) Authorize(attr authorizer.Attributes) (bool, string, error) {
if r.superUser != "" && attr.GetUser() != nil && attr.GetUser().GetName() == r.superUser {
return true, "", nil
}
ctx := api.WithNamespace(api.WithUser(api.NewContext(), attr.GetUser()), attr.GetNamespace())
// Frame the authorization request as a privilege escalation check.
var requestedRule rbac.PolicyRule
if attr.IsResourceRequest() {
requestedRule = rbac.PolicyRule{
Verbs: []string{attr.GetVerb()},
APIGroups: []string{attr.GetAPIGroup()}, // TODO(ericchiang): add api version here too?
Resources: []string{attr.GetResource()},
ResourceNames: []string{attr.GetName()},
}
} else {
requestedRule = rbac.PolicyRule{
Verbs: []string{attr.GetVerb()},
NonResourceURLs: []string{attr.GetPath()},
}
}
// TODO(nhlfr): Try to find more lightweight way to check attributes than escalation checks.
err := validation.ConfirmNoEscalation(ctx, r.authorizationRuleResolver, []rbac.PolicyRule{requestedRule})
if err != nil {
return false, err.Error(), nil
}
return true, "", nil
}
func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
if rbacregistry.EscalationAllowed(ctx, s.superUser) {
return s.StandardStorage.Create(ctx, obj)
}
clusterRole := obj.(*rbac.ClusterRole)
rules := clusterRole.Rules
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, clusterRole.Name, err)
}
return s.StandardStorage.Create(ctx, obj)
}
func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
if user, ok := api.UserFrom(ctx); ok {
if s.superUser != "" && user.GetName() == s.superUser {
return s.StandardStorage.Create(ctx, obj)
}
}
clusterRole := obj.(*rbac.ClusterRole)
rules := clusterRole.Rules
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, clusterRole.Name, err)
}
return s.StandardStorage.Create(ctx, obj)
}
func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
if rbacregistry.EscalationAllowed(ctx) {
return s.StandardStorage.Create(ctx, obj)
}
clusterRoleBinding := obj.(*rbac.ClusterRoleBinding)
rules, err := s.ruleResolver.GetRoleReferenceRules(clusterRoleBinding.RoleRef, clusterRoleBinding.Namespace)
if err != nil {
return nil, err
}
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, clusterRoleBinding.Name, err)
}
return s.StandardStorage.Create(ctx, obj)
}
func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
if rbacregistry.EscalationAllowed(ctx, s.superUser) {
return s.StandardStorage.Update(ctx, name, obj)
}
nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
clusterRole := obj.(*rbac.ClusterRole)
rules := clusterRole.Rules
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, clusterRole.Name, err)
}
return obj, nil
})
return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
}
func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
if user, ok := api.UserFrom(ctx); ok {
if s.superUser != "" && user.GetName() == s.superUser {
return s.StandardStorage.Create(ctx, obj)
}
}
roleBinding := obj.(*rbac.RoleBinding)
rules, err := s.ruleResolver.GetRoleReferenceRules(ctx, roleBinding.RoleRef, roleBinding.Namespace)
if err != nil {
return nil, err
}
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, roleBinding.Name, err)
}
return s.StandardStorage.Create(ctx, obj)
}
func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
if user, ok := api.UserFrom(ctx); ok {
if s.superUser != "" && user.GetName() == s.superUser {
return s.StandardStorage.Update(ctx, name, obj)
}
}
nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
role := obj.(*rbac.Role)
rules := role.Rules
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, role.Name, err)
}
return obj, nil
})
return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
}
func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
if rbacregistry.EscalationAllowed(ctx, s.superUser) {
return s.StandardStorage.Update(ctx, name, obj)
}
nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
roleBinding := obj.(*rbac.RoleBinding)
rules, err := s.ruleResolver.GetRoleReferenceRules(roleBinding.RoleRef, roleBinding.Namespace)
if err != nil {
return nil, err
}
if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
return nil, errors.NewForbidden(groupResource, roleBinding.Name, err)
}
return obj, nil
})
return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
}