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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"
"k8s.io/apiserver/pkg/authentication/authenticator"
"k8s.io/apiserver/pkg/authentication/authenticatorfactory"
"k8s.io/apiserver/pkg/authentication/group"
"k8s.io/apiserver/pkg/authentication/request/bearertoken"
"k8s.io/apiserver/pkg/authentication/request/headerrequest"
"k8s.io/apiserver/pkg/authentication/request/union"
"k8s.io/apiserver/pkg/authentication/request/websocket"
"k8s.io/apiserver/pkg/authentication/request/x509"
tokencache "k8s.io/apiserver/pkg/authentication/token/cache"
"k8s.io/apiserver/pkg/authentication/token/tokenfile"
tokenunion "k8s.io/apiserver/pkg/authentication/token/union"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/apiserver/plugin/pkg/authenticator/password/passwordfile"
"k8s.io/apiserver/plugin/pkg/authenticator/request/basicauth"
"k8s.io/apiserver/plugin/pkg/authenticator/token/webhook"
// Initialize all known client auth plugins.
certutil "k8s.io/client-go/util/cert"
"k8s.io/client-go/util/keyutil"
"k8s.io/kubernetes/pkg/features"
"k8s.io/kubernetes/pkg/serviceaccount"
)
// Config contains the data on how to authenticate a request to the Kube API Server
type Config struct {
BasicAuthFile string
ClientCAFile string
TokenAuthFile string
ServiceAccountKeyFiles []string
ServiceAccountLookup bool
ServiceAccountIssuer string
APIAudiences authenticator.Audiences
WebhookTokenAuthnConfigFile string
WebhookTokenAuthnCacheTTL time.Duration
TokenSuccessCacheTTL time.Duration
TokenFailureCacheTTL time.Duration
RequestHeaderConfig *authenticatorfactory.RequestHeaderConfig
// 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 Config) New() (authenticator.Request, error) {
var authenticators []authenticator.Request
var tokenAuthenticators []authenticator.Token
// front-proxy, BasicAuth methods, local first, then remote
// Add the front proxy authenticator if requested
if config.RequestHeaderConfig != nil {
requestHeaderAuthenticator, err := headerrequest.NewSecure(
config.RequestHeaderConfig.ClientCA,
config.RequestHeaderConfig.AllowedClientNames,
config.RequestHeaderConfig.UsernameHeaders,
config.RequestHeaderConfig.GroupHeaders,
config.RequestHeaderConfig.ExtraHeaderPrefixes,
)
if err != nil {
return nil, err
}
authenticators = append(authenticators, authenticator.WrapAudienceAgnosticRequest(config.APIAudiences, requestHeaderAuthenticator))
}
// basic auth
if len(config.BasicAuthFile) > 0 {
basicAuth, err := newAuthenticatorFromBasicAuthFile(config.BasicAuthFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, authenticator.WrapAudienceAgnosticRequest(config.APIAudiences, basicAuth))
}
// X509 methods
if len(config.ClientCAFile) > 0 {
certAuth, err := newAuthenticatorFromClientCAFile(config.ClientCAFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, certAuth)
}
// Bearer token methods, local first, then remote
if len(config.TokenAuthFile) > 0 {
tokenAuth, err := newAuthenticatorFromTokenFile(config.TokenAuthFile)
if err != nil {
return nil, err
}
tokenAuthenticators = append(tokenAuthenticators, authenticator.WrapAudienceAgnosticToken(config.APIAudiences, tokenAuth))
}
if len(config.ServiceAccountKeyFiles) > 0 {
serviceAccountAuth, err := newLegacyServiceAccountAuthenticator(config.ServiceAccountKeyFiles, config.ServiceAccountLookup, config.APIAudiences, config.ServiceAccountTokenGetter)
if err != nil {
return nil, err
}
tokenAuthenticators = append(tokenAuthenticators, serviceAccountAuth)
}
if utilfeature.DefaultFeatureGate.Enabled(features.TokenRequest) && config.ServiceAccountIssuer != "" {
serviceAccountAuth, err := newServiceAccountAuthenticator(config.ServiceAccountIssuer, config.ServiceAccountKeyFiles, config.APIAudiences, config.ServiceAccountTokenGetter)
if err != nil {
return nil, err
}
tokenAuthenticators = append(tokenAuthenticators, serviceAccountAuth)
}
if len(config.WebhookTokenAuthnConfigFile) > 0 {
webhookTokenAuth, err := newWebhookTokenAuthenticator(config.WebhookTokenAuthnConfigFile, config.WebhookTokenAuthnCacheTTL, config.APIAudiences)
if err != nil {
return nil, err
}
tokenAuthenticators = append(tokenAuthenticators, webhookTokenAuth)
}
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, true, config.TokenSuccessCacheTTL, config.TokenFailureCacheTTL)
}
authenticators = append(authenticators, bearertoken.New(tokenAuth), websocket.NewProtocolAuthenticator(tokenAuth))
}
if len(authenticators) == 0 {
return nil, nil
}
authenticator := union.New(authenticators...)
authenticator = group.NewAuthenticatedGroupAdder(authenticator)
return authenticator, nil
}
// IsValidServiceAccountKeyFile returns true if a valid public RSA key can be read from the given file
func IsValidServiceAccountKeyFile(file string) bool {
_, err := keyutil.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
}
// newAuthenticatorFromTokenFile returns an authenticator.Token or an error
func newAuthenticatorFromTokenFile(tokenAuthFile string) (authenticator.Token, error) {
tokenAuthenticator, err := tokenfile.NewCSV(tokenAuthFile)
if err != nil {
return nil, err
}
return tokenAuthenticator, nil
}
// newLegacyServiceAccountAuthenticator returns an authenticator.Token or an error
func newLegacyServiceAccountAuthenticator(keyfiles []string, lookup bool, apiAudiences authenticator.Audiences, serviceAccountGetter serviceaccount.ServiceAccountTokenGetter) (authenticator.Token, error) {
allPublicKeys := []interface{}{}
for _, keyfile := range keyfiles {
publicKeys, err := keyutil.PublicKeysFromFile(keyfile)
if err != nil {
return nil, err
}
allPublicKeys = append(allPublicKeys, publicKeys...)
}
tokenAuthenticator := serviceaccount.JWTTokenAuthenticator(serviceaccount.LegacyIssuer, allPublicKeys, apiAudiences, serviceaccount.NewLegacyValidator(lookup, serviceAccountGetter))
return tokenAuthenticator, nil
}
// newServiceAccountAuthenticator returns an authenticator.Token or an error
func newServiceAccountAuthenticator(iss string, keyfiles []string, apiAudiences authenticator.Audiences, serviceAccountGetter serviceaccount.ServiceAccountTokenGetter) (authenticator.Token, error) {
allPublicKeys := []interface{}{}
for _, keyfile := range keyfiles {
publicKeys, err := keyutil.PublicKeysFromFile(keyfile)
if err != nil {
return nil, err
}
allPublicKeys = append(allPublicKeys, publicKeys...)
}
tokenAuthenticator := serviceaccount.JWTTokenAuthenticator(iss, allPublicKeys, apiAudiences, serviceaccount.NewValidator(serviceAccountGetter))
return tokenAuthenticator, nil
}
// newAuthenticatorFromClientCAFile returns an authenticator.Request or an error
func newAuthenticatorFromClientCAFile(clientCAFile string) (authenticator.Request, error) {
roots, err := certutil.NewPool(clientCAFile)
if err != nil {
return nil, err
}
opts := x509.DefaultVerifyOptions()
opts.Roots = roots
return x509.New(opts, x509.CommonNameUserConversion), nil
}
func newWebhookTokenAuthenticator(webhookConfigFile string, ttl time.Duration, implicitAuds authenticator.Audiences) (authenticator.Token, error) {
webhookTokenAuthenticator, err := webhook.New(webhookConfigFile, implicitAuds)
if err != nil {
return nil, err
}
return tokencache.New(webhookTokenAuthenticator, false, ttl, ttl), nil
}