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authorization.go
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authorization.go
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// Copyright 2018 Istio Authors
//
// 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 model
import (
"fmt"
rbacproto "istio.io/api/rbac/v1alpha1"
istiolog "istio.io/istio/pkg/log"
)
const (
// DefaultRbacConfigName is the name of the mesh global RbacConfig name. Only RbacConfig with this
// name will be considered.
DefaultRbacConfigName = "default"
)
var (
rbacLog = istiolog.RegisterScope("rbac", "rbac debugging", 0)
)
// RolesAndBindings stores the the ServiceRole and ServiceRoleBinding in the same namespace.
type RolesAndBindings struct {
// ServiceRoles in the same namespace.
Roles []Config
// Maps from ServiceRole name to its associated ServiceRoleBindings.
RoleNameToBindings map[string][]*rbacproto.ServiceRoleBinding
}
// AuthorizationPolicyConfig stores the AuthorizationPolicy and its name.
type AuthorizationPolicyConfig struct {
Name string
Policy *rbacproto.AuthorizationPolicy
}
// AuthorizationConfigV2 stores a list of AuthorizationPolicyConfig and ServiceRole in a given namespace.
type AuthorizationConfigV2 struct {
// A list of AuthorizationPolicyConfig.
AuthzPolicies []*AuthorizationPolicyConfig
// Maps from name to ServiceRole.
NameToServiceRoles map[string]*rbacproto.ServiceRole
}
// AuthorizationPolicies stores all authorization policies (i.e. ServiceRole, ServiceRoleBinding and
// RbacConfig) according to its namespace.
type AuthorizationPolicies struct {
// Maps from namespace to ServiceRole and ServiceRoleBindings.
NamespaceToPolicies map[string]*RolesAndBindings
// Maps from namespace to AuthorizationConfigV2.
NamespaceToAuthorizationConfigV2 map[string]*AuthorizationConfigV2
// The mesh global RbacConfig.
RbacConfig *rbacproto.RbacConfig
// True if using RBAC v2 (i.e. AuthorizationPolicy and no ServiceRoleBinding).
IsRbacV2 bool
}
func (policy *AuthorizationPolicies) addServiceRole(role *Config) {
if role == nil || role.Spec.(*rbacproto.ServiceRole) == nil {
return
}
if policy.NamespaceToPolicies == nil {
policy.NamespaceToPolicies = map[string]*RolesAndBindings{}
}
if policy.NamespaceToPolicies[role.Namespace] == nil {
policy.NamespaceToPolicies[role.Namespace] = &RolesAndBindings{
Roles: []Config{},
RoleNameToBindings: map[string][]*rbacproto.ServiceRoleBinding{},
}
}
rolesAndBindings := policy.NamespaceToPolicies[role.Namespace]
rolesAndBindings.Roles = append(rolesAndBindings.Roles, *role)
// Initialize NameToServiceRoles for Authz v2.
if policy.NamespaceToAuthorizationConfigV2 == nil {
policy.NamespaceToAuthorizationConfigV2 = map[string]*AuthorizationConfigV2{}
}
if policy.NamespaceToAuthorizationConfigV2[role.Namespace] == nil {
policy.NamespaceToAuthorizationConfigV2[role.Namespace] = &AuthorizationConfigV2{
AuthzPolicies: []*AuthorizationPolicyConfig{},
NameToServiceRoles: map[string]*rbacproto.ServiceRole{},
}
}
authzV2 := policy.NamespaceToAuthorizationConfigV2[role.Namespace]
authzV2.NameToServiceRoles[role.Name] = role.Spec.(*rbacproto.ServiceRole)
}
func (policy *AuthorizationPolicies) addServiceRoleBinding(binding *Config) {
if binding == nil || binding.Spec.(*rbacproto.ServiceRoleBinding) == nil {
return
}
name := binding.Spec.(*rbacproto.ServiceRoleBinding).RoleRef.Name
if name == "" {
rbacLog.Errorf("ignored invalid binding %s in %s with empty RoleRef.Name",
binding.Name, binding.Namespace)
return
}
if policy.NamespaceToPolicies == nil {
policy.NamespaceToPolicies = map[string]*RolesAndBindings{}
}
if policy.NamespaceToPolicies[binding.Namespace] == nil {
policy.NamespaceToPolicies[binding.Namespace] = &RolesAndBindings{
Roles: []Config{},
RoleNameToBindings: map[string][]*rbacproto.ServiceRoleBinding{},
}
}
rolesAndBindings := policy.NamespaceToPolicies[binding.Namespace]
if rolesAndBindings.RoleNameToBindings[name] == nil {
rolesAndBindings.RoleNameToBindings[name] = []*rbacproto.ServiceRoleBinding{}
}
rolesAndBindings.RoleNameToBindings[name] = append(
rolesAndBindings.RoleNameToBindings[name], binding.Spec.(*rbacproto.ServiceRoleBinding))
}
func (policy *AuthorizationPolicies) addAuthorizationPolicy(authzPolicy *Config) {
if authzPolicy == nil || authzPolicy.Spec.(*rbacproto.AuthorizationPolicy) == nil {
return
}
// Initialize AuthzPolicies for authz v2.
if policy.NamespaceToAuthorizationConfigV2 == nil {
policy.NamespaceToAuthorizationConfigV2 = map[string]*AuthorizationConfigV2{}
}
if policy.NamespaceToAuthorizationConfigV2[authzPolicy.Namespace] == nil {
policy.NamespaceToAuthorizationConfigV2[authzPolicy.Namespace] = &AuthorizationConfigV2{
AuthzPolicies: []*AuthorizationPolicyConfig{},
NameToServiceRoles: map[string]*rbacproto.ServiceRole{},
}
}
authzV2 := policy.NamespaceToAuthorizationConfigV2[authzPolicy.Namespace]
authzV2.AuthzPolicies = append(authzV2.AuthzPolicies, &AuthorizationPolicyConfig{
Name: authzPolicy.Name,
Policy: authzPolicy.Spec.(*rbacproto.AuthorizationPolicy),
})
}
// AddConfig adds a config of type ServiceRole, ServiceRoleBinding or AuthorizationPolicy to
// AuthorizationPolicies.
func (policy *AuthorizationPolicies) AddConfig(cfgs ...*Config) {
for _, cfg := range cfgs {
if cfg == nil {
continue
}
switch cfg.Spec.(type) {
case *rbacproto.ServiceRole:
policy.addServiceRole(cfg)
case *rbacproto.ServiceRoleBinding:
policy.addServiceRoleBinding(cfg)
case *rbacproto.AuthorizationPolicy:
policy.addAuthorizationPolicy(cfg)
}
}
}
// RolesForNamespace returns the ServiceRole configs in the given namespace. This function always
// return a non nil slice.
func (policy *AuthorizationPolicies) RolesForNamespace(ns string) []Config {
if policy == nil || policy.NamespaceToPolicies == nil {
return []Config{}
}
rolesAndBindings := policy.NamespaceToPolicies[ns]
if rolesAndBindings == nil || rolesAndBindings.Roles == nil {
return []Config{}
}
return rolesAndBindings.Roles
}
// RoleToBindingsForNamespace returns the mapping from ServiceRole name to its associated ServiceRoleBindings.
// This function always return a non nil map.
func (policy *AuthorizationPolicies) RoleToBindingsForNamespace(ns string) map[string][]*rbacproto.ServiceRoleBinding {
if policy == nil || policy.NamespaceToPolicies == nil {
return map[string][]*rbacproto.ServiceRoleBinding{}
}
rolesAndBindings := policy.NamespaceToPolicies[ns]
if rolesAndBindings == nil || rolesAndBindings.RoleNameToBindings == nil {
return map[string][]*rbacproto.ServiceRoleBinding{}
}
return rolesAndBindings.RoleNameToBindings
}
// RoleForNameAndNamespace returns a ServiceRole from this namespace, given the ServiceRole name and namespace.
// This function always return a non nil struct instance.
func (policy *AuthorizationPolicies) RoleForNameAndNamespace(roleName, ns string) *rbacproto.ServiceRole {
if policy == nil || policy.NamespaceToAuthorizationConfigV2 == nil {
return &rbacproto.ServiceRole{}
}
nsToAuthzConfigV2 := policy.NamespaceToAuthorizationConfigV2[ns]
if nsToAuthzConfigV2 == nil {
return &rbacproto.ServiceRole{}
}
serviceRole, exist := nsToAuthzConfigV2.NameToServiceRoles[roleName]
if !exist {
return &rbacproto.ServiceRole{}
}
return serviceRole
}
// NewAuthzPolicies returns the AuthorizationPolicies constructed from raw authorization policies by
// storing policies into different namespaces.
func NewAuthzPolicies(env *Environment) (*AuthorizationPolicies, error) {
// Get the ClusterRbacConfig first, if not found then fallback to get the RbacConfig.
rbacConfig := env.IstioConfigStore.ClusterRbacConfig()
if rbacConfig == nil {
rbacConfig = env.IstioConfigStore.RbacConfig()
if rbacConfig == nil {
return nil, nil
}
}
policy := &AuthorizationPolicies{
NamespaceToPolicies: map[string]*RolesAndBindings{},
NamespaceToAuthorizationConfigV2: map[string]*AuthorizationConfigV2{},
RbacConfig: rbacConfig.Spec.(*rbacproto.RbacConfig),
IsRbacV2: false,
}
roles, err := env.List(ServiceRole.Type, NamespaceAll)
if err != nil {
return nil, err
}
for _, role := range roles {
policy.AddConfig(&role)
}
bindings, err := env.List(ServiceRoleBinding.Type, NamespaceAll)
if err != nil {
return nil, err
}
for _, binding := range bindings {
policy.AddConfig(&binding)
}
v2Policies, err := env.List(AuthorizationPolicy.Type, NamespaceAll)
if err != nil {
return nil, err
}
if len(v2Policies) > 0 {
if len(bindings) > 0 {
return nil, fmt.Errorf("had both AuthorizationPolicy and ServiceRoleBinding")
}
policy.IsRbacV2 = true
}
for _, v2Policy := range v2Policies {
policy.AddConfig(&v2Policy)
}
return policy, nil
}