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  }