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config.go
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config.go
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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package authenticator
import (
"time"
"github.com/go-openapi/spec"
"k8s.io/apiserver/pkg/authentication/authenticator"
"k8s.io/apiserver/pkg/authentication/group"
"k8s.io/apiserver/pkg/authentication/request/bearertoken"
"k8s.io/apiserver/pkg/authentication/request/union"
"k8s.io/apiserver/pkg/authentication/request/websocket"
tokencache "k8s.io/apiserver/pkg/authentication/token/cache"
tokenunion "k8s.io/apiserver/pkg/authentication/token/union"
"k8s.io/apiserver/plugin/pkg/authenticator/password/passwordfile"
"k8s.io/apiserver/plugin/pkg/authenticator/request/basicauth"
certutil "k8s.io/client-go/util/cert"
"k8s.io/kubernetes/pkg/serviceaccount"
_ "k8s.io/client-go/plugin/pkg/client/auth"
)
type AuthenticatorConfig struct {
BasicAuthFile string
ServiceAccountKeyFiles []string
ServiceAccountLookup bool
TokenSuccessCacheTTL time.Duration
TokenFailureCacheTTL time.Duration
// TODO, this is the only non-serializable part of the entire config. Factor it out into a clientconfig
ServiceAccountTokenGetter serviceaccount.ServiceAccountTokenGetter
}
// New returns an authenticator.Request or an error that supports the standard
// Kubernetes authentication mechanisms.
func (config AuthenticatorConfig) New() (authenticator.Request, *spec.SecurityDefinitions, error) {
var authenticators []authenticator.Request
var tokenAuthenticators []authenticator.Token
securityDefinitions := spec.SecurityDefinitions{}
hasBasicAuth := false
if len(config.BasicAuthFile) > 0 {
basicAuth, err := newAuthenticatorFromBasicAuthFile(config.BasicAuthFile)
if err != nil {
return nil, nil, err
}
authenticators = append(authenticators, basicAuth)
hasBasicAuth = true
}
if len(config.ServiceAccountKeyFiles) > 0 {
serviceAccountAuth, err := newLegacyServiceAccountAuthenticator(config.ServiceAccountKeyFiles, config.ServiceAccountLookup, config.ServiceAccountTokenGetter)
if err != nil {
return nil, nil, err
}
tokenAuthenticators = append(tokenAuthenticators, serviceAccountAuth)
}
if hasBasicAuth {
securityDefinitions["HTTPBasic"] = &spec.SecurityScheme{
SecuritySchemeProps: spec.SecuritySchemeProps{
Type: "basic",
Description: "HTTP Basic authentication",
},
}
}
if len(tokenAuthenticators) > 0 {
// Union the token authenticators
tokenAuth := tokenunion.New(tokenAuthenticators...)
// Optionally cache authentication results
if config.TokenSuccessCacheTTL > 0 || config.TokenFailureCacheTTL > 0 {
tokenAuth = tokencache.New(tokenAuth, config.TokenSuccessCacheTTL, config.TokenFailureCacheTTL)
}
authenticators = append(authenticators, bearertoken.New(tokenAuth), websocket.NewProtocolAuthenticator(tokenAuth))
securityDefinitions["BearerToken"] = &spec.SecurityScheme{
SecuritySchemeProps: spec.SecuritySchemeProps{
Type: "apiKey",
Name: "authorization",
In: "header",
Description: "Bearer Token authentication",
},
}
}
switch len(authenticators) {
case 0:
return nil, &securityDefinitions, nil
}
authenticator := union.New(authenticators...)
authenticator = group.NewAuthenticatedGroupAdder(authenticator)
return authenticator, &securityDefinitions, nil
}
// IsValidServiceAccountKeyFile returns true if a valid public RSA key can be read from the given file
func IsValidServiceAccountKeyFile(file string) bool {
_, err := certutil.PublicKeysFromFile(file)
return err == nil
}
// newAuthenticatorFromBasicAuthFile returns an authenticator.Request or an error
func newAuthenticatorFromBasicAuthFile(basicAuthFile string) (authenticator.Request, error) {
basicAuthenticator, err := passwordfile.NewCSV(basicAuthFile)
if err != nil {
return nil, err
}
return basicauth.New(basicAuthenticator), nil
}
// newLegacyServiceAccountAuthenticator returns an authenticator.Token or an error
func newLegacyServiceAccountAuthenticator(keyfiles []string, lookup bool, serviceAccountGetter serviceaccount.ServiceAccountTokenGetter) (authenticator.Token, error) {
allPublicKeys := []interface{}{}
for _, keyfile := range keyfiles {
publicKeys, err := certutil.PublicKeysFromFile(keyfile)
if err != nil {
return nil, err
}
allPublicKeys = append(allPublicKeys, publicKeys...)
}
tokenAuthenticator := serviceaccount.JWTTokenAuthenticator(serviceaccount.LegacyIssuer, allPublicKeys, serviceaccount.NewLegacyValidator(lookup, serviceAccountGetter))
return tokenAuthenticator, nil
}