remove bearer token from headers after we consume it

staging/src/k8s.io/apiserver/pkg/authentication/request/bearertoken/bearertoken.go

@@ -53,6 +53,11 @@ func (a *Authenticator) AuthenticateRequest(req *http.Request) (user.Info, bool,
 	}
 
 	user, ok, err := a.auth.AuthenticateToken(token)
+	// if we authenticated successfully, go ahead and remove the bearer token so that no one
+	// is ever tempted to use it inside of the API server
+	if ok {
+		req.Header.Del("Authorization")
+	}
 
 	// If the token authenticator didn't error, provide a default error
 	if !ok && err == nil {

staging/src/k8s.io/apiserver/pkg/authentication/request/bearertoken/bearertoken_test.go

@@ -19,6 +19,7 @@ package bearertoken
 import (
 	"errors"
 	"net/http"
+	"reflect"
 	"testing"
 
 	"k8s.io/apiserver/pkg/authentication/authenticator"
@@ -103,3 +104,94 @@ func TestAuthenticateRequestBadValue(t *testing.T) {
 		}
 	}
 }
+
+func TestBearerToken(t *testing.T) {
+	tests := map[string]struct {
+		AuthorizationHeaders []string
+		TokenAuth            authenticator.Token
+
+		ExpectedUserName             string
+		ExpectedOK                   bool
+		ExpectedErr                  bool
+		ExpectedAuthorizationHeaders []string
+	}{
+		"no header": {
+			AuthorizationHeaders:         nil,
+			ExpectedUserName:             "",
+			ExpectedOK:                   false,
+			ExpectedErr:                  false,
+			ExpectedAuthorizationHeaders: nil,
+		},
+		"empty header": {
+			AuthorizationHeaders:         []string{""},
+			ExpectedUserName:             "",
+			ExpectedOK:                   false,
+			ExpectedErr:                  false,
+			ExpectedAuthorizationHeaders: []string{""},
+		},
+		"non-bearer header": {
+			AuthorizationHeaders:         []string{"Basic 123"},
+			ExpectedUserName:             "",
+			ExpectedOK:                   false,
+			ExpectedErr:                  false,
+			ExpectedAuthorizationHeaders: []string{"Basic 123"},
+		},
+		"empty bearer token": {
+			AuthorizationHeaders:         []string{"Bearer "},
+			ExpectedUserName:             "",
+			ExpectedOK:                   false,
+			ExpectedErr:                  false,
+			ExpectedAuthorizationHeaders: []string{"Bearer "},
+		},
+		"valid bearer token removing header": {
+			AuthorizationHeaders:         []string{"Bearer 123"},
+			TokenAuth:                    authenticator.TokenFunc(func(t string) (user.Info, bool, error) { return &user.DefaultInfo{Name: "myuser"}, true, nil }),
+			ExpectedUserName:             "myuser",
+			ExpectedOK:                   true,
+			ExpectedErr:                  false,
+			ExpectedAuthorizationHeaders: nil,
+		},
+		"invalid bearer token": {
+			AuthorizationHeaders:         []string{"Bearer 123"},
+			TokenAuth:                    authenticator.TokenFunc(func(t string) (user.Info, bool, error) { return nil, false, nil }),
+			ExpectedUserName:             "",
+			ExpectedOK:                   false,
+			ExpectedErr:                  true,
+			ExpectedAuthorizationHeaders: []string{"Bearer 123"},
+		},
+		"error bearer token": {
+			AuthorizationHeaders:         []string{"Bearer 123"},
+			TokenAuth:                    authenticator.TokenFunc(func(t string) (user.Info, bool, error) { return nil, false, errors.New("error") }),
+			ExpectedUserName:             "",
+			ExpectedOK:                   false,
+			ExpectedErr:                  true,
+			ExpectedAuthorizationHeaders: []string{"Bearer 123"},
+		},
+	}
+
+	for k, tc := range tests {
+		req, _ := http.NewRequest("GET", "/", nil)
+		for _, h := range tc.AuthorizationHeaders {
+			req.Header.Add("Authorization", h)
+		}
+
+		bearerAuth := New(tc.TokenAuth)
+		u, ok, err := bearerAuth.AuthenticateRequest(req)
+		if tc.ExpectedErr != (err != nil) {
+			t.Errorf("%s: Expected err=%v, got %v", k, tc.ExpectedErr, err)
+			continue
+		}
+		if ok != tc.ExpectedOK {
+			t.Errorf("%s: Expected ok=%v, got %v", k, tc.ExpectedOK, ok)
+			continue
+		}
+		if ok && u.GetName() != tc.ExpectedUserName {
+			t.Errorf("%s: Expected username=%v, got %v", k, tc.ExpectedUserName, u.GetName())
+			continue
+		}
+		if !reflect.DeepEqual(req.Header["Authorization"], tc.ExpectedAuthorizationHeaders) {
+			t.Errorf("%s: Expected headers=%#v, got %#v", k, tc.ExpectedAuthorizationHeaders, req.Header["Authorization"])
+			continue
+		}
+	}
+}