mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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111 lines
3.6 KiB
Go
111 lines
3.6 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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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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"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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)
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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) (err error) {
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return 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) (err error) {
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return errors.New("Everything is forbidden.")
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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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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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)
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// Keep this list in sync with constant list above.
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var AuthorizationModeChoices = []string{ModeAlwaysAllow, ModeAlwaysDeny, ModeABAC}
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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, authorizationPolicyFile string) (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 authorizationPolicyFile == "" {
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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(authorizationPolicyFile)
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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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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] && authorizationPolicyFile != "" {
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return nil, errors.New("Cannot specify --authorization-policy-file without mode ABAC")
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}
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return union.New(authorizers...), nil
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}
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