k8s.io/apiserver@v0.31.1/pkg/authentication/authenticator/audagnostic.go (about) 1 /* 2 Copyright 2018 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 authenticator 18 19 import ( 20 "context" 21 "fmt" 22 "net/http" 23 ) 24 25 func authenticate(ctx context.Context, implicitAuds Audiences, authenticate func() (*Response, bool, error)) (*Response, bool, error) { 26 targetAuds, ok := AudiencesFrom(ctx) 27 // We can remove this once api audiences is never empty. That will probably 28 // be N releases after TokenRequest is GA. 29 if !ok { 30 return authenticate() 31 } 32 auds := implicitAuds.Intersect(targetAuds) 33 if len(auds) == 0 { 34 return nil, false, nil 35 } 36 resp, ok, err := authenticate() 37 if err != nil || !ok { 38 return nil, false, err 39 } 40 if len(resp.Audiences) > 0 { 41 // maybe the authenticator was audience aware after all. 42 return nil, false, fmt.Errorf("audience agnostic authenticator wrapped an authenticator that returned audiences: %q", resp.Audiences) 43 } 44 resp.Audiences = auds 45 return resp, true, nil 46 } 47 48 type audAgnosticRequestAuthenticator struct { 49 implicit Audiences 50 delegate Request 51 } 52 53 var _ = Request(&audAgnosticRequestAuthenticator{}) 54 55 func (a *audAgnosticRequestAuthenticator) AuthenticateRequest(req *http.Request) (*Response, bool, error) { 56 return authenticate(req.Context(), a.implicit, func() (*Response, bool, error) { 57 return a.delegate.AuthenticateRequest(req) 58 }) 59 } 60 61 // WrapAudienceAgnosticRequest wraps an audience agnostic request authenticator 62 // to restrict its accepted audiences to a set of implicit audiences. 63 func WrapAudienceAgnosticRequest(implicit Audiences, delegate Request) Request { 64 return &audAgnosticRequestAuthenticator{ 65 implicit: implicit, 66 delegate: delegate, 67 } 68 } 69 70 type audAgnosticTokenAuthenticator struct { 71 implicit Audiences 72 delegate Token 73 } 74 75 var _ = Token(&audAgnosticTokenAuthenticator{}) 76 77 func (a *audAgnosticTokenAuthenticator) AuthenticateToken(ctx context.Context, tok string) (*Response, bool, error) { 78 return authenticate(ctx, a.implicit, func() (*Response, bool, error) { 79 return a.delegate.AuthenticateToken(ctx, tok) 80 }) 81 } 82 83 // WrapAudienceAgnosticToken wraps an audience agnostic token authenticator to 84 // restrict its accepted audiences to a set of implicit audiences. 85 func WrapAudienceAgnosticToken(implicit Audiences, delegate Token) Token { 86 return &audAgnosticTokenAuthenticator{ 87 implicit: implicit, 88 delegate: delegate, 89 } 90 }