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implement token authenticator for new id tokens #59940

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merged 2 commits into from
Feb 28, 2018
Merged

implement token authenticator for new id tokens #59940

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1fbf8b8
svcacct: move getters to use an external clientset
mikedanese Feb 23, 2018
024f57a
implement token authenticator for new id tokens
mikedanese Feb 25, 2018
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57 changes: 29 additions & 28 deletions cmd/kube-apiserver/app/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -326,18 +326,25 @@ func CreateKubeAPIServerConfig(s *options.ServerRunOptions, nodeTunneler tunnele
}

var issuer serviceaccount.TokenGenerator
if s.ServiceAccountSigningKeyFile != "" || s.Authentication.ServiceAccounts.Issuer != "" {
var apiAudiences []string
if s.ServiceAccountSigningKeyFile != "" ||
s.Authentication.ServiceAccounts.Issuer != "" ||
len(s.Authentication.ServiceAccounts.APIAudiences) > 0 {
if !utilfeature.DefaultFeatureGate.Enabled(features.TokenRequest) {
return nil, nil, nil, nil, nil, fmt.Errorf("the TokenRequest feature is not enabled but --service-account-signing-key-file and/or --service-account-issuer-id flags were passed")
}
if s.ServiceAccountSigningKeyFile == "" || s.Authentication.ServiceAccounts.Issuer == "" {
return nil, nil, nil, nil, nil, fmt.Errorf("service-account-signing-key-file and service-account-issuer should be specified together")
if s.ServiceAccountSigningKeyFile == "" ||
s.Authentication.ServiceAccounts.Issuer == "" ||
len(s.Authentication.ServiceAccounts.APIAudiences) == 0 ||
len(s.Authentication.ServiceAccounts.KeyFiles) == 0 {
return nil, nil, nil, nil, nil, fmt.Errorf("service-account-signing-key-file, service-account-issuer, service-account-api-audiences and service-account-key-file should be specified together")
}
sk, err := certutil.PrivateKeyFromFile(s.ServiceAccountSigningKeyFile)
if err != nil {
return nil, nil, nil, nil, nil, fmt.Errorf("failed to parse service-account-issuer-key-file: %v", err)
}
issuer = serviceaccount.JWTTokenGenerator(s.Authentication.ServiceAccounts.Issuer, sk)
apiAudiences = s.Authentication.ServiceAccounts.APIAudiences
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require len(s.Authentication.ServiceAccounts.APIAudiences) > 0?

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Done above.

}

config := &master.Config{
Expand Down Expand Up @@ -371,7 +378,9 @@ func CreateKubeAPIServerConfig(s *options.ServerRunOptions, nodeTunneler tunnele

EndpointReconcilerType: reconcilers.Type(s.EndpointReconcilerType),
MasterCount: s.MasterCount,
ServiceAccountIssuer: issuer,

ServiceAccountIssuer: issuer,
ServiceAccountAPIAudiences: apiAudiences,
},
}

Expand Down Expand Up @@ -471,7 +480,7 @@ func BuildGenericConfig(s *options.ServerRunOptions, proxyTransport *http.Transp
)
}

genericConfig.Authentication.Authenticator, genericConfig.OpenAPIConfig.SecurityDefinitions, err = BuildAuthenticator(s, storageFactory, client, sharedInformers)
genericConfig.Authentication.Authenticator, genericConfig.OpenAPIConfig.SecurityDefinitions, err = BuildAuthenticator(s, storageFactory, client, clientgoExternalClient, sharedInformers)
if err != nil {
return nil, nil, nil, nil, nil, fmt.Errorf("invalid authentication config: %v", err)
}
Expand Down Expand Up @@ -555,25 +564,10 @@ func BuildAdmissionPluginInitializers(s *options.ServerRunOptions, client intern
}

// BuildAuthenticator constructs the authenticator
func BuildAuthenticator(s *options.ServerRunOptions, storageFactory serverstorage.StorageFactory, client internalclientset.Interface, sharedInformers informers.SharedInformerFactory) (authenticator.Request, *spec.SecurityDefinitions, error) {
func BuildAuthenticator(s *options.ServerRunOptions, storageFactory serverstorage.StorageFactory, client internalclientset.Interface, extclient clientgoclientset.Interface, sharedInformers informers.SharedInformerFactory) (authenticator.Request, *spec.SecurityDefinitions, error) {
authenticatorConfig := s.Authentication.ToAuthenticationConfig()
if s.Authentication.ServiceAccounts.Lookup {
// we have to go direct to storage because the clientsets fail when they're initialized with some API versions excluded
// we should stop trying to control them like that.
storageConfigServiceAccounts, err := storageFactory.NewConfig(api.Resource("serviceaccounts"))
if err != nil {
return nil, nil, fmt.Errorf("unable to get serviceaccounts storage: %v", err)
}
storageConfigSecrets, err := storageFactory.NewConfig(api.Resource("secrets"))
if err != nil {
return nil, nil, fmt.Errorf("unable to get secrets storage: %v", err)
}
authenticatorConfig.ServiceAccountTokenGetter = serviceaccountcontroller.NewGetterFromStorageInterface(
storageConfigServiceAccounts,
storageFactory.ResourcePrefix(api.Resource("serviceaccounts")),
storageConfigSecrets,
storageFactory.ResourcePrefix(api.Resource("secrets")),
)
authenticatorConfig.ServiceAccountTokenGetter = serviceaccountcontroller.NewGetterFromClient(extclient)
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+1000

}
if client == nil || reflect.ValueOf(client).IsNil() {
// TODO: Remove check once client can never be nil.
Expand Down Expand Up @@ -687,12 +681,19 @@ func defaultOptions(s *options.ServerRunOptions) error {

s.Authentication.ApplyAuthorization(s.Authorization)

// Default to the private server key for service account token signing
if len(s.Authentication.ServiceAccounts.KeyFiles) == 0 && s.SecureServing.ServerCert.CertKey.KeyFile != "" {
if kubeauthenticator.IsValidServiceAccountKeyFile(s.SecureServing.ServerCert.CertKey.KeyFile) {
s.Authentication.ServiceAccounts.KeyFiles = []string{s.SecureServing.ServerCert.CertKey.KeyFile}
} else {
glog.Warning("No TLS key provided, service account token authentication disabled")
// Use (ServiceAccountSigningKeyFile != "") as a proxy to the user enabling
// TokenRequest functionality. This defaulting was convenient, but messed up
// a lot of people when they rotated their serving cert with no idea it was
// connected to their service account keys. We are taking this oppurtunity to
// remove this problematic defaulting.
if s.ServiceAccountSigningKeyFile == "" {
// Default to the private server key for service account token signing
if len(s.Authentication.ServiceAccounts.KeyFiles) == 0 && s.SecureServing.ServerCert.CertKey.KeyFile != "" {
if kubeauthenticator.IsValidServiceAccountKeyFile(s.SecureServing.ServerCert.CertKey.KeyFile) {
s.Authentication.ServiceAccounts.KeyFiles = []string{s.SecureServing.ServerCert.CertKey.KeyFile}
} else {
glog.Warning("No TLS key provided, service account token authentication disabled")
}
}
}

Expand Down
7 changes: 0 additions & 7 deletions pkg/controller/serviceaccount/BUILD
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Original file line number Diff line number Diff line change
Expand Up @@ -16,12 +16,8 @@ go_library(
],
importpath = "k8s.io/kubernetes/pkg/controller/serviceaccount",
deps = [
"//pkg/apis/core/v1:go_default_library",
"//pkg/controller:go_default_library",
"//pkg/registry/core/secret:go_default_library",
"//pkg/registry/core/secret/storage:go_default_library",
"//pkg/registry/core/serviceaccount:go_default_library",
"//pkg/registry/core/serviceaccount/storage:go_default_library",
"//pkg/serviceaccount:go_default_library",
"//pkg/util/metrics:go_default_library",
"//vendor/github.com/golang/glog:go_default_library",
Expand All @@ -33,9 +29,6 @@ go_library(
"//vendor/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/util/sets:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
"//vendor/k8s.io/apiserver/pkg/endpoints/request:go_default_library",
"//vendor/k8s.io/apiserver/pkg/registry/generic:go_default_library",
"//vendor/k8s.io/apiserver/pkg/storage/storagebackend:go_default_library",
"//vendor/k8s.io/client-go/informers/core/v1:go_default_library",
"//vendor/k8s.io/client-go/kubernetes:go_default_library",
"//vendor/k8s.io/client-go/listers/core/v1:go_default_library",
Expand Down
62 changes: 5 additions & 57 deletions pkg/controller/serviceaccount/tokengetter.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,15 +19,7 @@ package serviceaccount
import (
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/registry/generic"
"k8s.io/apiserver/pkg/storage/storagebackend"
clientset "k8s.io/client-go/kubernetes"
apiv1 "k8s.io/kubernetes/pkg/apis/core/v1"
"k8s.io/kubernetes/pkg/registry/core/secret"
secretstore "k8s.io/kubernetes/pkg/registry/core/secret/storage"
serviceaccountregistry "k8s.io/kubernetes/pkg/registry/core/serviceaccount"
serviceaccountstore "k8s.io/kubernetes/pkg/registry/core/serviceaccount/storage"
"k8s.io/kubernetes/pkg/serviceaccount"
)

Expand All @@ -43,59 +35,15 @@ type clientGetter struct {
func NewGetterFromClient(c clientset.Interface) serviceaccount.ServiceAccountTokenGetter {
return clientGetter{c}
}

func (c clientGetter) GetServiceAccount(namespace, name string) (*v1.ServiceAccount, error) {
return c.client.CoreV1().ServiceAccounts(namespace).Get(name, metav1.GetOptions{})
}
func (c clientGetter) GetSecret(namespace, name string) (*v1.Secret, error) {
return c.client.CoreV1().Secrets(namespace).Get(name, metav1.GetOptions{})
}

// registryGetter implements ServiceAccountTokenGetter using a service account and secret registry
type registryGetter struct {
serviceAccounts serviceaccountregistry.Registry
secrets secret.Registry
func (c clientGetter) GetPod(namespace, name string) (*v1.Pod, error) {
return c.client.CoreV1().Pods(namespace).Get(name, metav1.GetOptions{})
}

// NewGetterFromRegistries returns a ServiceAccountTokenGetter that
// uses the specified registries to retrieve service accounts and secrets.
func NewGetterFromRegistries(serviceAccounts serviceaccountregistry.Registry, secrets secret.Registry) serviceaccount.ServiceAccountTokenGetter {
return &registryGetter{serviceAccounts, secrets}
}
func (r *registryGetter) GetServiceAccount(namespace, name string) (*v1.ServiceAccount, error) {
ctx := genericapirequest.WithNamespace(genericapirequest.NewContext(), namespace)
internalServiceAccount, err := r.serviceAccounts.GetServiceAccount(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, err
}
v1ServiceAccount := v1.ServiceAccount{}
err = apiv1.Convert_core_ServiceAccount_To_v1_ServiceAccount(internalServiceAccount, &v1ServiceAccount, nil)
return &v1ServiceAccount, err

}
func (r *registryGetter) GetSecret(namespace, name string) (*v1.Secret, error) {
ctx := genericapirequest.WithNamespace(genericapirequest.NewContext(), namespace)
internalSecret, err := r.secrets.GetSecret(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, err
}
v1Secret := v1.Secret{}
err = apiv1.Convert_core_Secret_To_v1_Secret(internalSecret, &v1Secret, nil)
return &v1Secret, err

}

// NewGetterFromStorageInterface returns a ServiceAccountTokenGetter that
// uses the specified storage to retrieve service accounts and secrets.
func NewGetterFromStorageInterface(
saConfig *storagebackend.Config,
saPrefix string,
secretConfig *storagebackend.Config,
secretPrefix string) serviceaccount.ServiceAccountTokenGetter {

saOpts := generic.RESTOptions{StorageConfig: saConfig, Decorator: generic.UndecoratedStorage, ResourcePrefix: saPrefix}
secretOpts := generic.RESTOptions{StorageConfig: secretConfig, Decorator: generic.UndecoratedStorage, ResourcePrefix: secretPrefix}
return NewGetterFromRegistries(
serviceaccountregistry.NewRegistry(serviceaccountstore.NewREST(saOpts, nil, nil, nil)),
secret.NewRegistry(secretstore.NewREST(secretOpts)),
)
func (c clientGetter) GetSecret(namespace, name string) (*v1.Secret, error) {
return c.client.CoreV1().Secrets(namespace).Get(name, metav1.GetOptions{})
}
2 changes: 2 additions & 0 deletions pkg/kubeapiserver/authenticator/BUILD
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ go_library(
srcs = ["config.go"],
importpath = "k8s.io/kubernetes/pkg/kubeapiserver/authenticator",
deps = [
"//pkg/features:go_default_library",
"//pkg/serviceaccount:go_default_library",
"//vendor/github.com/go-openapi/spec:go_default_library",
"//vendor/k8s.io/apiserver/pkg/authentication/authenticator:go_default_library",
Expand All @@ -24,6 +25,7 @@ go_library(
"//vendor/k8s.io/apiserver/pkg/authentication/token/cache:go_default_library",
"//vendor/k8s.io/apiserver/pkg/authentication/token/tokenfile:go_default_library",
"//vendor/k8s.io/apiserver/pkg/authentication/token/union:go_default_library",
"//vendor/k8s.io/apiserver/pkg/util/feature:go_default_library",
"//vendor/k8s.io/apiserver/plugin/pkg/authenticator/password/passwordfile:go_default_library",
"//vendor/k8s.io/apiserver/plugin/pkg/authenticator/request/basicauth:go_default_library",
"//vendor/k8s.io/apiserver/plugin/pkg/authenticator/token/oidc:go_default_library",
Expand Down
32 changes: 29 additions & 3 deletions pkg/kubeapiserver/authenticator/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,11 +33,13 @@ import (
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/oidc"
"k8s.io/apiserver/plugin/pkg/authenticator/token/webhook"
certutil "k8s.io/client-go/util/cert"
"k8s.io/kubernetes/pkg/features"
"k8s.io/kubernetes/pkg/serviceaccount"

_ "k8s.io/client-go/plugin/pkg/client/auth"
Expand All @@ -59,6 +61,8 @@ type AuthenticatorConfig struct {
OIDCSigningAlgs []string
ServiceAccountKeyFiles []string
ServiceAccountLookup bool
ServiceAccountIssuer string
ServiceAccountAPIAudiences []string
WebhookTokenAuthnConfigFile string
WebhookTokenAuthnCacheTTL time.Duration

Expand Down Expand Up @@ -123,7 +127,14 @@ func (config AuthenticatorConfig) New() (authenticator.Request, *spec.SecurityDe
tokenAuthenticators = append(tokenAuthenticators, tokenAuth)
}
if len(config.ServiceAccountKeyFiles) > 0 {
serviceAccountAuth, err := newServiceAccountAuthenticator(config.ServiceAccountKeyFiles, config.ServiceAccountLookup, config.ServiceAccountTokenGetter)
serviceAccountAuth, err := newLegacyServiceAccountAuthenticator(config.ServiceAccountKeyFiles, config.ServiceAccountLookup, config.ServiceAccountTokenGetter)
if err != nil {
return nil, nil, err
}
tokenAuthenticators = append(tokenAuthenticators, serviceAccountAuth)
}
if utilfeature.DefaultFeatureGate.Enabled(features.TokenRequest) && config.ServiceAccountIssuer != "" {
serviceAccountAuth, err := newServiceAccountAuthenticator(config.ServiceAccountIssuer, config.ServiceAccountAPIAudiences, config.ServiceAccountKeyFiles, config.ServiceAccountTokenGetter)
if err != nil {
return nil, nil, err
}
Expand Down Expand Up @@ -267,8 +278,8 @@ func newAuthenticatorFromOIDCIssuerURL(issuerURL, clientID, caFile, usernameClai
return tokenAuthenticator, nil
}

// newServiceAccountAuthenticator returns an authenticator.Token or an error
func newServiceAccountAuthenticator(keyfiles []string, lookup bool, serviceAccountGetter serviceaccount.ServiceAccountTokenGetter) (authenticator.Token, error) {
// 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)
Expand All @@ -282,6 +293,21 @@ func newServiceAccountAuthenticator(keyfiles []string, lookup bool, serviceAccou
return tokenAuthenticator, nil
}

// newServiceAccountAuthenticator returns an authenticator.Token or an error
func newServiceAccountAuthenticator(iss string, audiences []string, keyfiles []string, 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(iss, allPublicKeys, serviceaccount.NewValidator(audiences, serviceAccountGetter))
return tokenAuthenticator, nil
}

// newAuthenticatorFromClientCAFile returns an authenticator.Request or an error
func newAuthenticatorFromClientCAFile(clientCAFile string) (authenticator.Request, error) {
roots, err := certutil.NewPool(clientCAFile)
Expand Down
19 changes: 14 additions & 5 deletions pkg/kubeapiserver/options/authentication.go
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Original file line number Diff line number Diff line change
Expand Up @@ -70,9 +70,10 @@ type PasswordFileAuthenticationOptions struct {
}

type ServiceAccountAuthenticationOptions struct {
KeyFiles []string
Lookup bool
Issuer string
KeyFiles []string
Lookup bool
Issuer string
APIAudiences []string
}

type TokenFileAuthenticationOptions struct {
Expand Down Expand Up @@ -236,15 +237,21 @@ func (s *BuiltInAuthenticationOptions) AddFlags(fs *pflag.FlagSet) {
if s.ServiceAccounts != nil {
fs.StringArrayVar(&s.ServiceAccounts.KeyFiles, "service-account-key-file", s.ServiceAccounts.KeyFiles, ""+
"File containing PEM-encoded x509 RSA or ECDSA private or public keys, used to verify "+
"ServiceAccount tokens. If unspecified, --tls-private-key-file is used. "+
"The specified file can contain multiple keys, and the flag can be specified multiple times with different files.")
"ServiceAccount tokens. The specified file can contain multiple keys, and the flag can "+
"be specified multiple times with different files. If unspecified, "+
"--tls-private-key-file is used. Must be specified when "+
"--service-account-signing-key is provided")

fs.BoolVar(&s.ServiceAccounts.Lookup, "service-account-lookup", s.ServiceAccounts.Lookup,
"If true, validate ServiceAccount tokens exist in etcd as part of authentication.")

fs.StringVar(&s.ServiceAccounts.Issuer, "service-account-issuer", s.ServiceAccounts.Issuer, ""+
"Identifier of the service account token issuer. The issuer will assert this identifier "+
"in \"iss\" claim of issued tokens. This value is a string or URI.")

fs.StringSliceVar(&s.ServiceAccounts.APIAudiences, "service-account-api-audiences", s.ServiceAccounts.APIAudiences, ""+
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Sorry if this was discussed previously, but why multiple audiences?

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This will be nice when:

  1. API servers are accessed from multiple URI's (e.g. behind a loadbalancer and directly)
  2. Someone wants to change the name of the apiserver (e.g. changing DNS name of LB) which is a special case of 1)
  3. If someone wants to have a universal and specific identifier for their cluster API (e.g. https://kubernetes.default.svc and https://cluster-1.dev.example.com)

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API servers are accessed from multiple URI's (e.g. behind a loadbalancer and directly)

All for that. This is one fo the limitations of the OpenID Connect spec that's caused us pain.

The JWT validation requires all the audiences to be present in the JWT: https://github.com/square/go-jose/blob/v2.1.3/jwt/validation.go#L73

It sounds like we only want to require one audience out of the set.

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Fixed.

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@liggitt liggitt Feb 23, 2018 •
edited

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did the token generator get updated to set audiences to the apiserver's audiences when none are requested in the TokenRequest? I expected these to be required if you wanted to use TokenRequest (possibly with a default), and to be plumbed to that rest handler

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Done.

"Identifiers of the API. The service account token authenticator will validate that "+
"tokens used against the API are bound to at least one of these audiences.")
}

if s.TokenFile != nil {
Expand Down Expand Up @@ -303,6 +310,8 @@ func (s *BuiltInAuthenticationOptions) ToAuthenticationConfig() authenticator.Au
if s.ServiceAccounts != nil {
ret.ServiceAccountKeyFiles = s.ServiceAccounts.KeyFiles
ret.ServiceAccountLookup = s.ServiceAccounts.Lookup
ret.ServiceAccountIssuer = s.ServiceAccounts.Issuer
ret.ServiceAccountAPIAudiences = s.ServiceAccounts.APIAudiences
}

if s.TokenFile != nil {
Expand Down
20 changes: 11 additions & 9 deletions pkg/master/master.go
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Original file line number Diff line number Diff line change
Expand Up @@ -157,7 +157,8 @@ type ExtraConfig struct {
// Selects which reconciler to use
EndpointReconcilerType reconcilers.Type

ServiceAccountIssuer serviceaccount.TokenGenerator
ServiceAccountIssuer serviceaccount.TokenGenerator
ServiceAccountAPIAudiences []string
}

type Config struct {
Expand Down Expand Up @@ -314,14 +315,15 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
// install legacy rest storage
if c.ExtraConfig.APIResourceConfigSource.VersionEnabled(apiv1.SchemeGroupVersion) {
legacyRESTStorageProvider := corerest.LegacyRESTStorageProvider{
StorageFactory: c.ExtraConfig.StorageFactory,
ProxyTransport: c.ExtraConfig.ProxyTransport,
KubeletClientConfig: c.ExtraConfig.KubeletClientConfig,
EventTTL: c.ExtraConfig.EventTTL,
ServiceIPRange: c.ExtraConfig.ServiceIPRange,
ServiceNodePortRange: c.ExtraConfig.ServiceNodePortRange,
LoopbackClientConfig: c.GenericConfig.LoopbackClientConfig,
ServiceAccountIssuer: c.ExtraConfig.ServiceAccountIssuer,
StorageFactory: c.ExtraConfig.StorageFactory,
ProxyTransport: c.ExtraConfig.ProxyTransport,
KubeletClientConfig: c.ExtraConfig.KubeletClientConfig,
EventTTL: c.ExtraConfig.EventTTL,
ServiceIPRange: c.ExtraConfig.ServiceIPRange,
ServiceNodePortRange: c.ExtraConfig.ServiceNodePortRange,
LoopbackClientConfig: c.GenericConfig.LoopbackClientConfig,
ServiceAccountIssuer: c.ExtraConfig.ServiceAccountIssuer,
ServiceAccountAPIAudiences: c.ExtraConfig.ServiceAccountAPIAudiences,
}
m.InstallLegacyAPI(&c, c.GenericConfig.RESTOptionsGetter, legacyRESTStorageProvider)
}
Expand Down