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authn.go
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authn.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 (
"crypto/rsa"
"time"
"k8s.io/kubernetes/pkg/auth/authenticator"
"k8s.io/kubernetes/pkg/auth/authenticator/bearertoken"
"k8s.io/kubernetes/pkg/serviceaccount"
"k8s.io/kubernetes/pkg/util/crypto"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/password/keystone"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/password/passwordfile"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/request/basicauth"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/request/union"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/request/x509"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/token/oidc"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/token/tokenfile"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/token/webhook"
)
type AuthenticatorConfig struct {
BasicAuthFile string
ClientCAFile string
TokenAuthFile string
OIDCIssuerURL string
OIDCClientID string
OIDCCAFile string
OIDCUsernameClaim string
OIDCGroupsClaim string
ServiceAccountKeyFile string
ServiceAccountLookup bool
ServiceAccountTokenGetter serviceaccount.ServiceAccountTokenGetter
KeystoneURL string
WebhookTokenAuthnConfigFile string
WebhookTokenAuthnCacheTTL time.Duration
}
// New returns an authenticator.Request or an error that supports the standard
// Kubernetes authentication mechanisms.
func New(config AuthenticatorConfig) (authenticator.Request, error) {
var authenticators []authenticator.Request
if len(config.BasicAuthFile) > 0 {
basicAuth, err := newAuthenticatorFromBasicAuthFile(config.BasicAuthFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, basicAuth)
}
if len(config.ClientCAFile) > 0 {
certAuth, err := newAuthenticatorFromClientCAFile(config.ClientCAFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, certAuth)
}
if len(config.TokenAuthFile) > 0 {
tokenAuth, err := newAuthenticatorFromTokenFile(config.TokenAuthFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, tokenAuth)
}
if len(config.ServiceAccountKeyFile) > 0 {
serviceAccountAuth, err := newServiceAccountAuthenticator(config.ServiceAccountKeyFile, config.ServiceAccountLookup, config.ServiceAccountTokenGetter)
if err != nil {
return nil, err
}
authenticators = append(authenticators, serviceAccountAuth)
}
// NOTE(ericchiang): Keep the OpenID Connect after Service Accounts.
//
// Because both plugins verify JWTs whichever comes first in the union experiences
// cache misses for all requests using the other. While the service account plugin
// simply returns an error, the OpenID Connect plugin may query the provider to
// update the keys, causing performance hits.
if len(config.OIDCIssuerURL) > 0 && len(config.OIDCClientID) > 0 {
oidcAuth, err := newAuthenticatorFromOIDCIssuerURL(config.OIDCIssuerURL, config.OIDCClientID, config.OIDCCAFile, config.OIDCUsernameClaim, config.OIDCGroupsClaim)
if err != nil {
return nil, err
}
authenticators = append(authenticators, oidcAuth)
}
if len(config.KeystoneURL) > 0 {
keystoneAuth, err := newAuthenticatorFromKeystoneURL(config.KeystoneURL)
if err != nil {
return nil, err
}
authenticators = append(authenticators, keystoneAuth)
}
if len(config.WebhookTokenAuthnConfigFile) > 0 {
webhookTokenAuth, err := newWebhookTokenAuthenticator(config.WebhookTokenAuthnConfigFile, config.WebhookTokenAuthnCacheTTL)
if err != nil {
return nil, err
}
authenticators = append(authenticators, webhookTokenAuth)
}
switch len(authenticators) {
case 0:
return nil, nil
case 1:
return authenticators[0], nil
default:
return union.New(authenticators...), nil
}
}
// IsValidServiceAccountKeyFile returns true if a valid public RSA key can be read from the given file
func IsValidServiceAccountKeyFile(file string) bool {
_, err := serviceaccount.ReadPublicKey(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.Request or an error
func newAuthenticatorFromTokenFile(tokenAuthFile string) (authenticator.Request, error) {
tokenAuthenticator, err := tokenfile.NewCSV(tokenAuthFile)
if err != nil {
return nil, err
}
return bearertoken.New(tokenAuthenticator), nil
}
// newAuthenticatorFromOIDCIssuerURL returns an authenticator.Request or an error.
func newAuthenticatorFromOIDCIssuerURL(issuerURL, clientID, caFile, usernameClaim, groupsClaim string) (authenticator.Request, error) {
tokenAuthenticator, err := oidc.New(oidc.OIDCOptions{
IssuerURL: issuerURL,
ClientID: clientID,
CAFile: caFile,
UsernameClaim: usernameClaim,
GroupsClaim: groupsClaim,
})
if err != nil {
return nil, err
}
return bearertoken.New(tokenAuthenticator), nil
}
// newServiceAccountAuthenticator returns an authenticator.Request or an error
func newServiceAccountAuthenticator(keyfile string, lookup bool, serviceAccountGetter serviceaccount.ServiceAccountTokenGetter) (authenticator.Request, error) {
publicKey, err := serviceaccount.ReadPublicKey(keyfile)
if err != nil {
return nil, err
}
tokenAuthenticator := serviceaccount.JWTTokenAuthenticator([]*rsa.PublicKey{publicKey}, lookup, serviceAccountGetter)
return bearertoken.New(tokenAuthenticator), nil
}
// newAuthenticatorFromClientCAFile returns an authenticator.Request or an error
func newAuthenticatorFromClientCAFile(clientCAFile string) (authenticator.Request, error) {
roots, err := crypto.CertPoolFromFile(clientCAFile)
if err != nil {
return nil, err
}
opts := x509.DefaultVerifyOptions()
opts.Roots = roots
return x509.New(opts, x509.CommonNameUserConversion), nil
}
// newAuthenticatorFromTokenFile returns an authenticator.Request or an error
func newAuthenticatorFromKeystoneURL(keystoneURL string) (authenticator.Request, error) {
keystoneAuthenticator, err := keystone.NewKeystoneAuthenticator(keystoneURL)
if err != nil {
return nil, err
}
return basicauth.New(keystoneAuthenticator), nil
}
func newWebhookTokenAuthenticator(webhookConfigFile string, ttl time.Duration) (authenticator.Request, error) {
webhookTokenAuthenticator, err := webhook.New(webhookConfigFile, ttl)
if err != nil {
return nil, err
}
return bearertoken.New(webhookTokenAuthenticator), nil
}