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rbac.go
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rbac.go
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package resolver
import (
"crypto/sha256"
"encoding/json"
"fmt"
"math/big"
"github.com/operator-framework/api/pkg/operators/v1alpha1"
"github.com/operator-framework/operator-lifecycle-manager/pkg/controller/install"
hashutil "github.com/operator-framework/operator-lifecycle-manager/pkg/lib/kubernetes/pkg/util/hash"
"github.com/operator-framework/operator-lifecycle-manager/pkg/lib/ownerutil"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const maxNameLength = 63
func generateName(base string, o interface{}) (string, error) {
hash, err := hashutil.DeepHashObject(o)
if err != nil {
return "", err
}
if len(base)+len(hash) > maxNameLength {
base = base[:maxNameLength-len(hash)-1]
}
return fmt.Sprintf("%s-%s", base, hash), nil
}
type OperatorPermissions struct {
ServiceAccount *corev1.ServiceAccount
Roles []*rbacv1.Role
RoleBindings []*rbacv1.RoleBinding
ClusterRoles []*rbacv1.ClusterRole
ClusterRoleBindings []*rbacv1.ClusterRoleBinding
}
func NewOperatorPermissions(serviceAccount *corev1.ServiceAccount) *OperatorPermissions {
return &OperatorPermissions{
ServiceAccount: serviceAccount,
Roles: []*rbacv1.Role{},
RoleBindings: []*rbacv1.RoleBinding{},
ClusterRoles: []*rbacv1.ClusterRole{},
ClusterRoleBindings: []*rbacv1.ClusterRoleBinding{},
}
}
func (o *OperatorPermissions) AddRole(role *rbacv1.Role) {
o.Roles = append(o.Roles, role)
}
func (o *OperatorPermissions) AddRoleBinding(roleBinding *rbacv1.RoleBinding) {
o.RoleBindings = append(o.RoleBindings, roleBinding)
}
func (o *OperatorPermissions) AddClusterRole(clusterRole *rbacv1.ClusterRole) {
o.ClusterRoles = append(o.ClusterRoles, clusterRole)
}
func (o *OperatorPermissions) AddClusterRoleBinding(clusterRoleBinding *rbacv1.ClusterRoleBinding) {
o.ClusterRoleBindings = append(o.ClusterRoleBindings, clusterRoleBinding)
}
const ContentHashLabelKey = "olm.permissions.hash"
func PolicyRuleHashLabelValue(rules []rbacv1.PolicyRule) (string, error) {
raw, err := json.Marshal(rules)
if err != nil {
return "", err
}
return toBase62(sha256.Sum224(raw)), nil
}
func RoleReferenceAndSubjectHashLabelValue(roleRef rbacv1.RoleRef, subjects []rbacv1.Subject) (string, error) {
var container = struct {
RoleRef rbacv1.RoleRef
Subjects []rbacv1.Subject
}{
RoleRef: roleRef,
Subjects: subjects,
}
raw, err := json.Marshal(&container)
if err != nil {
return "", err
}
return toBase62(sha256.Sum224(raw)), nil
}
func toBase62(hash [28]byte) string {
var i big.Int
i.SetBytes(hash[:])
return i.Text(62)
}
func RBACForClusterServiceVersion(csv *v1alpha1.ClusterServiceVersion) (map[string]*OperatorPermissions, error) {
permissions := map[string]*OperatorPermissions{}
// Use a StrategyResolver to get the strategy details
strategyResolver := install.StrategyResolver{}
strategy, err := strategyResolver.UnmarshalStrategy(csv.Spec.InstallStrategy)
if err != nil {
return nil, err
}
// Assume the strategy is for a deployment
strategyDetailsDeployment, ok := strategy.(*v1alpha1.StrategyDetailsDeployment)
if !ok {
return nil, fmt.Errorf("could not assert strategy implementation as deployment for CSV %s", csv.GetName())
}
// Resolve Permissions
for _, permission := range strategyDetailsDeployment.Permissions {
// Create ServiceAccount if necessary
if _, ok := permissions[permission.ServiceAccountName]; !ok {
serviceAccount := &corev1.ServiceAccount{}
serviceAccount.SetNamespace(csv.GetNamespace())
serviceAccount.SetName(permission.ServiceAccountName)
ownerutil.AddNonBlockingOwner(serviceAccount, csv)
permissions[permission.ServiceAccountName] = NewOperatorPermissions(serviceAccount)
}
// Create Role
name, err := generateName(fmt.Sprintf("%s-%s", csv.GetName(), permission.ServiceAccountName), struct {
Name string `json:"name,omitempty"`
Permission v1alpha1.StrategyDeploymentPermissions `json:"permission"`
}{Name: csv.GetName(), Permission: permission})
if err != nil {
return nil, err
}
role := &rbacv1.Role{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: csv.GetNamespace(),
OwnerReferences: []metav1.OwnerReference{ownerutil.NonBlockingOwner(csv)},
Labels: ownerutil.OwnerLabel(csv, v1alpha1.ClusterServiceVersionKind),
},
Rules: permission.Rules,
}
hash, err := PolicyRuleHashLabelValue(permission.Rules)
if err != nil {
return nil, fmt.Errorf("failed to hash permission rules: %w", err)
}
role.Labels[ContentHashLabelKey] = hash
permissions[permission.ServiceAccountName].AddRole(role)
// Create RoleBinding
roleBinding := &rbacv1.RoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: role.GetName(),
Namespace: csv.GetNamespace(),
OwnerReferences: []metav1.OwnerReference{ownerutil.NonBlockingOwner(csv)},
Labels: ownerutil.OwnerLabel(csv, v1alpha1.ClusterServiceVersionKind),
},
RoleRef: rbacv1.RoleRef{
Kind: "Role",
Name: role.GetName(),
APIGroup: rbacv1.GroupName},
Subjects: []rbacv1.Subject{{
Kind: "ServiceAccount",
Name: permission.ServiceAccountName,
Namespace: csv.GetNamespace(),
}},
}
hash, err = RoleReferenceAndSubjectHashLabelValue(roleBinding.RoleRef, roleBinding.Subjects)
if err != nil {
return nil, fmt.Errorf("failed to hash binding content: %w", err)
}
roleBinding.Labels[ContentHashLabelKey] = hash
permissions[permission.ServiceAccountName].AddRoleBinding(roleBinding)
}
// Resolve ClusterPermissions as StepResources
for _, permission := range strategyDetailsDeployment.ClusterPermissions {
// Create ServiceAccount if necessary
if _, ok := permissions[permission.ServiceAccountName]; !ok {
serviceAccount := &corev1.ServiceAccount{}
ownerutil.AddOwner(serviceAccount, csv, false, false)
serviceAccount.SetName(permission.ServiceAccountName)
permissions[permission.ServiceAccountName] = NewOperatorPermissions(serviceAccount)
}
// Create ClusterRole
name, err := generateName(csv.GetName(), struct {
Name string `json:"name,omitempty"`
Namespace string `json:"namespace,omitempty"`
Permission v1alpha1.StrategyDeploymentPermissions `json:"permission"`
}{Name: csv.GetName(), Namespace: csv.GetNamespace(), Permission: permission})
if err != nil {
return nil, err
}
role := &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Labels: ownerutil.OwnerLabel(csv, v1alpha1.ClusterServiceVersionKind),
},
Rules: permission.Rules,
}
hash, err := PolicyRuleHashLabelValue(permission.Rules)
if err != nil {
return nil, fmt.Errorf("failed to hash permission rules: %w", err)
}
role.Labels[ContentHashLabelKey] = hash
permissions[permission.ServiceAccountName].AddClusterRole(role)
// Create ClusterRoleBinding
roleBinding := &rbacv1.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: role.GetName(),
Namespace: csv.GetNamespace(),
Labels: ownerutil.OwnerLabel(csv, v1alpha1.ClusterServiceVersionKind),
},
RoleRef: rbacv1.RoleRef{
Kind: "ClusterRole",
Name: role.GetName(),
APIGroup: rbacv1.GroupName,
},
Subjects: []rbacv1.Subject{{
Kind: "ServiceAccount",
Name: permission.ServiceAccountName,
Namespace: csv.GetNamespace(),
}},
}
hash, err = RoleReferenceAndSubjectHashLabelValue(roleBinding.RoleRef, roleBinding.Subjects)
if err != nil {
return nil, fmt.Errorf("failed to hash binding content: %w", err)
}
roleBinding.Labels[ContentHashLabelKey] = hash
permissions[permission.ServiceAccountName].AddClusterRoleBinding(roleBinding)
}
return permissions, nil
}