Matthias Andreas Benkard | 832a54e | 2019-01-29 09:27:38 +0100 | [diff] [blame^] | 1 | /* |
| 2 | Copyright 2016 The Kubernetes Authors. |
| 3 | |
| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | you may not use this file except in compliance with the License. |
| 6 | You may obtain a copy of the License at |
| 7 | |
| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | Unless required by applicable law or agreed to in writing, software |
| 11 | distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | See the License for the specific language governing permissions and |
| 14 | limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package authenticatorfactory |
| 18 | |
| 19 | import ( |
| 20 | "errors" |
| 21 | "fmt" |
| 22 | "time" |
| 23 | |
| 24 | "github.com/go-openapi/spec" |
| 25 | |
| 26 | "k8s.io/apiserver/pkg/authentication/authenticator" |
| 27 | "k8s.io/apiserver/pkg/authentication/group" |
| 28 | "k8s.io/apiserver/pkg/authentication/request/anonymous" |
| 29 | "k8s.io/apiserver/pkg/authentication/request/bearertoken" |
| 30 | "k8s.io/apiserver/pkg/authentication/request/headerrequest" |
| 31 | unionauth "k8s.io/apiserver/pkg/authentication/request/union" |
| 32 | "k8s.io/apiserver/pkg/authentication/request/websocket" |
| 33 | "k8s.io/apiserver/pkg/authentication/request/x509" |
| 34 | webhooktoken "k8s.io/apiserver/plugin/pkg/authenticator/token/webhook" |
| 35 | authenticationclient "k8s.io/client-go/kubernetes/typed/authentication/v1beta1" |
| 36 | "k8s.io/client-go/util/cert" |
| 37 | ) |
| 38 | |
| 39 | // DelegatingAuthenticatorConfig is the minimal configuration needed to create an authenticator |
| 40 | // built to delegate authentication to a kube API server |
| 41 | type DelegatingAuthenticatorConfig struct { |
| 42 | Anonymous bool |
| 43 | |
| 44 | TokenAccessReviewClient authenticationclient.TokenReviewInterface |
| 45 | |
| 46 | // CacheTTL is the length of time that a token authentication answer will be cached. |
| 47 | CacheTTL time.Duration |
| 48 | |
| 49 | // ClientCAFile is the CA bundle file used to authenticate client certificates |
| 50 | ClientCAFile string |
| 51 | |
| 52 | RequestHeaderConfig *RequestHeaderConfig |
| 53 | } |
| 54 | |
| 55 | func (c DelegatingAuthenticatorConfig) New() (authenticator.Request, *spec.SecurityDefinitions, error) { |
| 56 | authenticators := []authenticator.Request{} |
| 57 | securityDefinitions := spec.SecurityDefinitions{} |
| 58 | |
| 59 | // front-proxy first, then remote |
| 60 | // Add the front proxy authenticator if requested |
| 61 | if c.RequestHeaderConfig != nil { |
| 62 | requestHeaderAuthenticator, err := headerrequest.NewSecure( |
| 63 | c.RequestHeaderConfig.ClientCA, |
| 64 | c.RequestHeaderConfig.AllowedClientNames, |
| 65 | c.RequestHeaderConfig.UsernameHeaders, |
| 66 | c.RequestHeaderConfig.GroupHeaders, |
| 67 | c.RequestHeaderConfig.ExtraHeaderPrefixes, |
| 68 | ) |
| 69 | if err != nil { |
| 70 | return nil, nil, err |
| 71 | } |
| 72 | authenticators = append(authenticators, requestHeaderAuthenticator) |
| 73 | } |
| 74 | |
| 75 | // x509 client cert auth |
| 76 | if len(c.ClientCAFile) > 0 { |
| 77 | clientCAs, err := cert.NewPool(c.ClientCAFile) |
| 78 | if err != nil { |
| 79 | return nil, nil, fmt.Errorf("unable to load client CA file %s: %v", c.ClientCAFile, err) |
| 80 | } |
| 81 | verifyOpts := x509.DefaultVerifyOptions() |
| 82 | verifyOpts.Roots = clientCAs |
| 83 | authenticators = append(authenticators, x509.New(verifyOpts, x509.CommonNameUserConversion)) |
| 84 | } |
| 85 | |
| 86 | if c.TokenAccessReviewClient != nil { |
| 87 | tokenAuth, err := webhooktoken.NewFromInterface(c.TokenAccessReviewClient, c.CacheTTL) |
| 88 | if err != nil { |
| 89 | return nil, nil, err |
| 90 | } |
| 91 | authenticators = append(authenticators, bearertoken.New(tokenAuth), websocket.NewProtocolAuthenticator(tokenAuth)) |
| 92 | |
| 93 | securityDefinitions["BearerToken"] = &spec.SecurityScheme{ |
| 94 | SecuritySchemeProps: spec.SecuritySchemeProps{ |
| 95 | Type: "apiKey", |
| 96 | Name: "authorization", |
| 97 | In: "header", |
| 98 | Description: "Bearer Token authentication", |
| 99 | }, |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | if len(authenticators) == 0 { |
| 104 | if c.Anonymous { |
| 105 | return anonymous.NewAuthenticator(), &securityDefinitions, nil |
| 106 | } |
| 107 | return nil, nil, errors.New("No authentication method configured") |
| 108 | } |
| 109 | |
| 110 | authenticator := group.NewAuthenticatedGroupAdder(unionauth.New(authenticators...)) |
| 111 | if c.Anonymous { |
| 112 | authenticator = unionauth.NewFailOnError(authenticator, anonymous.NewAuthenticator()) |
| 113 | } |
| 114 | return authenticator, &securityDefinitions, nil |
| 115 | } |