
Before this change, Authorize() method was just returning an error, regardless of whether the user is unauthorized or whether there is some other unrelated error. Returning boolean with information about user authorization and error (which should be unrelated to the authorization) separately will make it easier to debug. Fixes #27974
185 lines
6.2 KiB
Go
185 lines
6.2 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package apiserver
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import (
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"errors"
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"fmt"
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"time"
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"k8s.io/kubernetes/pkg/auth/authorizer"
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"k8s.io/kubernetes/pkg/auth/authorizer/abac"
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"k8s.io/kubernetes/pkg/auth/authorizer/union"
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"k8s.io/kubernetes/pkg/registry/clusterrole"
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"k8s.io/kubernetes/pkg/registry/clusterrolebinding"
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"k8s.io/kubernetes/pkg/registry/role"
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"k8s.io/kubernetes/pkg/registry/rolebinding"
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"k8s.io/kubernetes/plugin/pkg/auth/authorizer/rbac"
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"k8s.io/kubernetes/plugin/pkg/auth/authorizer/webhook"
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)
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// Attributes implements authorizer.Attributes interface.
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type Attributes struct {
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// TODO: add fields and methods when authorizer.Attributes is completed.
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}
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// alwaysAllowAuthorizer is an implementation of authorizer.Attributes
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// which always says yes to an authorization request.
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// It is useful in tests and when using kubernetes in an open manner.
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type alwaysAllowAuthorizer struct{}
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func (alwaysAllowAuthorizer) Authorize(a authorizer.Attributes) (authorized bool, reason string, err error) {
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return true, "", nil
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}
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func NewAlwaysAllowAuthorizer() authorizer.Authorizer {
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return new(alwaysAllowAuthorizer)
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}
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// alwaysDenyAuthorizer is an implementation of authorizer.Attributes
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// which always says no to an authorization request.
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// It is useful in unit tests to force an operation to be forbidden.
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type alwaysDenyAuthorizer struct{}
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func (alwaysDenyAuthorizer) Authorize(a authorizer.Attributes) (authorized bool, reason string, err error) {
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return false, "Everything is forbidden.", nil
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}
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func NewAlwaysDenyAuthorizer() authorizer.Authorizer {
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return new(alwaysDenyAuthorizer)
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}
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// alwaysFailAuthorizer is an implementation of authorizer.Attributes
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// which always says no to an authorization request.
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// It is useful in unit tests to force an operation to fail with error.
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type alwaysFailAuthorizer struct{}
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func (alwaysFailAuthorizer) Authorize(a authorizer.Attributes) (authorized bool, reason string, err error) {
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return false, "", errors.New("Authorization failure.")
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}
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func NewAlwaysFailAuthorizer() authorizer.Authorizer {
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return new(alwaysFailAuthorizer)
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}
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const (
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ModeAlwaysAllow string = "AlwaysAllow"
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ModeAlwaysDeny string = "AlwaysDeny"
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ModeABAC string = "ABAC"
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ModeWebhook string = "Webhook"
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ModeRBAC string = "RBAC"
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)
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// Keep this list in sync with constant list above.
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var AuthorizationModeChoices = []string{ModeAlwaysAllow, ModeAlwaysDeny, ModeABAC, ModeWebhook, ModeRBAC}
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type AuthorizationConfig struct {
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// Options for ModeABAC
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// Path to a ABAC policy file.
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PolicyFile string
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// Options for ModeWebhook
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// Kubeconfig file for Webhook authorization plugin.
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WebhookConfigFile string
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// TTL for caching of authorized responses from the webhook server.
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WebhookCacheAuthorizedTTL time.Duration
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// TTL for caching of unauthorized responses from the webhook server.
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WebhookCacheUnauthorizedTTL time.Duration
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// Options for RBAC
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// User which can bootstrap role policies
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RBACSuperUser string
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RBACClusterRoleRegistry clusterrole.Registry
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RBACClusterRoleBindingRegistry clusterrolebinding.Registry
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RBACRoleRegistry role.Registry
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RBACRoleBindingRegistry rolebinding.Registry
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}
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// NewAuthorizerFromAuthorizationConfig returns the right sort of union of multiple authorizer.Authorizer objects
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// based on the authorizationMode or an error. authorizationMode should be a comma separated values
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// of AuthorizationModeChoices.
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func NewAuthorizerFromAuthorizationConfig(authorizationModes []string, config AuthorizationConfig) (authorizer.Authorizer, error) {
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if len(authorizationModes) == 0 {
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return nil, errors.New("Atleast one authorization mode should be passed")
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}
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var authorizers []authorizer.Authorizer
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authorizerMap := make(map[string]bool)
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for _, authorizationMode := range authorizationModes {
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if authorizerMap[authorizationMode] {
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return nil, fmt.Errorf("Authorization mode %s specified more than once", authorizationMode)
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}
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// Keep cases in sync with constant list above.
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switch authorizationMode {
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case ModeAlwaysAllow:
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authorizers = append(authorizers, NewAlwaysAllowAuthorizer())
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case ModeAlwaysDeny:
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authorizers = append(authorizers, NewAlwaysDenyAuthorizer())
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case ModeABAC:
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if config.PolicyFile == "" {
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return nil, errors.New("ABAC's authorization policy file not passed")
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}
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abacAuthorizer, err := abac.NewFromFile(config.PolicyFile)
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if err != nil {
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return nil, err
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}
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authorizers = append(authorizers, abacAuthorizer)
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case ModeWebhook:
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if config.WebhookConfigFile == "" {
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return nil, errors.New("Webhook's configuration file not passed")
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}
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webhookAuthorizer, err := webhook.New(config.WebhookConfigFile,
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config.WebhookCacheAuthorizedTTL,
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config.WebhookCacheUnauthorizedTTL)
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if err != nil {
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return nil, err
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}
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authorizers = append(authorizers, webhookAuthorizer)
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case ModeRBAC:
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rbacAuthorizer := rbac.New(
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config.RBACRoleRegistry,
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config.RBACRoleBindingRegistry,
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config.RBACClusterRoleRegistry,
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config.RBACClusterRoleBindingRegistry,
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config.RBACSuperUser,
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)
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authorizers = append(authorizers, rbacAuthorizer)
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default:
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return nil, fmt.Errorf("Unknown authorization mode %s specified", authorizationMode)
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}
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authorizerMap[authorizationMode] = true
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}
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if !authorizerMap[ModeABAC] && config.PolicyFile != "" {
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return nil, errors.New("Cannot specify --authorization-policy-file without mode ABAC")
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}
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if !authorizerMap[ModeWebhook] && config.WebhookConfigFile != "" {
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return nil, errors.New("Cannot specify --authorization-webhook-config-file without mode Webhook")
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}
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if !authorizerMap[ModeRBAC] && config.RBACSuperUser != "" {
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return nil, errors.New("Cannot specify --authorization-rbac-super-user without mode RBAC")
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}
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return union.New(authorizers...), nil
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}
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