/
parser.go
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/
parser.go
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// Copyright 2018 FairwindsOps Inc
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package reconciler
import (
"errors"
"fmt"
rbacmanagerv1beta1 "github.com/fairwindsops/rbac-manager/pkg/apis/rbacmanager/v1beta1"
"github.com/fairwindsops/rbac-manager/pkg/kube"
logrus "github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
// Parser parses RBAC Definitions and determines the Kubernetes resources that it specifies
type Parser struct {
Clientset kubernetes.Interface
ownerRefs []metav1.OwnerReference
parsedClusterRoleBindings []rbacv1.ClusterRoleBinding
parsedRoleBindings []rbacv1.RoleBinding
parsedServiceAccounts []v1.ServiceAccount
}
// Parse determines the desired Kubernetes resources an RBAC Definition refers to
func (p *Parser) Parse(rbacDef rbacmanagerv1beta1.RBACDefinition) error {
if rbacDef.RBACBindings == nil {
logrus.Warn("No RBACBindings defined")
return nil
}
for _, rbacBinding := range rbacDef.RBACBindings {
namePrefix := rdNamePrefix(&rbacDef, &rbacBinding)
err := p.parseRBACBinding(rbacBinding, namePrefix)
if err != nil {
return err
}
}
return nil
}
func (p *Parser) parseRBACBinding(rbacBinding rbacmanagerv1beta1.RBACBinding, namePrefix string) error {
if len(rbacBinding.Subjects) < 1 {
return errors.New("No subjects specified for RBAC Binding: " + namePrefix)
}
for _, requestedSubject := range rbacBinding.Subjects {
if requestedSubject.Kind == "ServiceAccount" {
pullsecrets := []v1.LocalObjectReference{}
for _, secret := range requestedSubject.ImagePullSecrets {
pullsecrets = append(pullsecrets, v1.LocalObjectReference{Name: secret})
}
p.parsedServiceAccounts = append(p.parsedServiceAccounts, v1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: requestedSubject.Name,
Namespace: requestedSubject.Namespace,
OwnerReferences: p.ownerRefs,
Labels: kube.Labels,
},
ImagePullSecrets: pullsecrets,
})
}
}
if rbacBinding.ClusterRoleBindings != nil {
for _, requestedCRB := range rbacBinding.ClusterRoleBindings {
err := p.parseClusterRoleBinding(requestedCRB, rbacBinding.Subjects, namePrefix)
if err != nil {
return err
}
}
}
if rbacBinding.RoleBindings != nil {
for _, requestedRB := range rbacBinding.RoleBindings {
err := p.parseRoleBinding(requestedRB, rbacBinding.Subjects, namePrefix)
if err != nil {
return err
}
}
}
return nil
}
func (p *Parser) parseClusterRoleBinding(
crb rbacmanagerv1beta1.ClusterRoleBinding, subjects []rbacmanagerv1beta1.Subject, prefix string) error {
crbName := fmt.Sprintf("%v-%v", prefix, crb.ClusterRole)
subs := managerSubjectsToRbacSubjects(subjects)
p.parsedClusterRoleBindings = append(p.parsedClusterRoleBindings, rbacv1.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: crbName,
OwnerReferences: p.ownerRefs,
Labels: kube.Labels,
},
RoleRef: rbacv1.RoleRef{
Kind: "ClusterRole",
Name: crb.ClusterRole,
},
Subjects: subs,
})
return nil
}
func (p *Parser) parseRoleBinding(
rb rbacmanagerv1beta1.RoleBinding, subjects []rbacmanagerv1beta1.Subject, prefix string) error {
objectMeta := metav1.ObjectMeta{
OwnerReferences: p.ownerRefs,
Labels: kube.Labels,
}
var requestedRoleName string
var roleRef rbacv1.RoleRef
if rb.ClusterRole != "" {
logrus.Debugf("Processing Requested ClusterRole %v <> %v <> %v", rb.ClusterRole, rb.Namespace, rb)
requestedRoleName = rb.ClusterRole
roleRef = rbacv1.RoleRef{
Kind: "ClusterRole",
Name: rb.ClusterRole,
}
} else if rb.Role != "" {
logrus.Debugf("Processing Requested Role %v <> %v <> %v", rb.Role, rb.Namespace, rb)
requestedRoleName = fmt.Sprintf("%v-%v", rb.Role, rb.Namespace)
roleRef = rbacv1.RoleRef{
Kind: "Role",
Name: rb.Role,
}
} else {
return errors.New("Invalid role binding, role or clusterRole required")
}
objectMeta.Name = fmt.Sprintf("%v-%v", prefix, requestedRoleName)
if rb.NamespaceSelector.MatchLabels != nil || len(rb.NamespaceSelector.MatchExpressions) > 0 {
logrus.Debugf("Processing Namespace Selector %v", rb.NamespaceSelector)
selector, err := metav1.LabelSelectorAsSelector(&rb.NamespaceSelector)
if err != nil {
logrus.Debug("Error parsing label selector")
return err
}
listOptions := metav1.ListOptions{LabelSelector: selector.String()}
namespaces, err := p.Clientset.CoreV1().Namespaces().List(listOptions)
if err != nil {
logrus.Debug("Error listing namespaces")
return err
}
for _, namespace := range namespaces.Items {
logrus.Debugf("Adding Role Binding With Dynamic Namespace %v", namespace.Name)
om := objectMeta
om.Namespace = namespace.Name
subs := managerSubjectsToRbacSubjects(subjects)
p.parsedRoleBindings = append(p.parsedRoleBindings, rbacv1.RoleBinding{
ObjectMeta: om,
RoleRef: roleRef,
Subjects: subs,
})
}
} else if rb.Namespace != "" {
objectMeta.Namespace = rb.Namespace
subs := managerSubjectsToRbacSubjects(subjects)
p.parsedRoleBindings = append(p.parsedRoleBindings, rbacv1.RoleBinding{
ObjectMeta: objectMeta,
RoleRef: roleRef,
Subjects: subs,
})
} else {
return errors.New("Invalid role binding, namespace or namespace selector required")
}
return nil
}
func (p *Parser) hasNamespaceSelectors(rbacDef *rbacmanagerv1beta1.RBACDefinition) bool {
for _, rbacBinding := range rbacDef.RBACBindings {
for _, roleBinding := range rbacBinding.RoleBindings {
if roleBinding.Namespace == "" {
// Split these up instead of using || so we can test both paths.
if roleBinding.NamespaceSelector.MatchLabels != nil {
return true
}
if roleBinding.NamespaceSelector.MatchExpressions != nil {
return true
}
}
}
}
return false
}
func (p *Parser) parseClusterRoleBindings(rbacDef *rbacmanagerv1beta1.RBACDefinition) {
for _, rbacBinding := range rbacDef.RBACBindings {
for _, clusterRoleBinding := range rbacBinding.ClusterRoleBindings {
namePrefix := rdNamePrefix(rbacDef, &rbacBinding)
p.parseClusterRoleBinding(clusterRoleBinding, rbacBinding.Subjects, namePrefix)
}
}
}
func (p *Parser) parseRoleBindings(rbacDef *rbacmanagerv1beta1.RBACDefinition) {
for _, rbacBinding := range rbacDef.RBACBindings {
for _, roleBinding := range rbacBinding.RoleBindings {
namePrefix := rdNamePrefix(rbacDef, &rbacBinding)
p.parseRoleBinding(roleBinding, rbacBinding.Subjects, namePrefix)
}
}
}
func rdNamePrefix(rbacDef *rbacmanagerv1beta1.RBACDefinition, rbacBinding *rbacmanagerv1beta1.RBACBinding) string {
return fmt.Sprintf("%v-%v", rbacDef.Name, rbacBinding.Name)
}
func managerSubjectsToRbacSubjects(subjects []rbacmanagerv1beta1.Subject) []rbacv1.Subject {
var subs []rbacv1.Subject
for _, sub := range subjects {
subs = append(subs, rbacv1.Subject{
Kind: sub.Kind,
APIGroup: sub.APIGroup,
Name: sub.Name,
Namespace: sub.Namespace,
})
}
return subs
}