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pkg/apiserver/authenticator: move oidc after service accounts

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Both plugins verify JWTs, but the OpenID Connect plugin performs
much worse when faced with cache misses. Reorder the plugins so
the service account plugin tries to authenticate a bearer token
first.
This commit is contained in:
Eric Chiang 2016-08-11 09:41:50 -07:00
parent ea69570f61
commit 9b5ce5218f
1 changed files with 14 additions and 8 deletions
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22
pkg/apiserver/authenticator/authn.go
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@ -80,14 +80,6 @@ func New(config AuthenticatorConfig) (authenticator.Request, error) {
authenticators = append(authenticators, tokenAuth) authenticators = append(authenticators, tokenAuth)
} }
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.ServiceAccountKeyFile) > 0 { if len(config.ServiceAccountKeyFile) > 0 {
serviceAccountAuth, err := newServiceAccountAuthenticator(config.ServiceAccountKeyFile, config.ServiceAccountLookup, config.ServiceAccountTokenGetter) serviceAccountAuth, err := newServiceAccountAuthenticator(config.ServiceAccountKeyFile, config.ServiceAccountLookup, config.ServiceAccountTokenGetter)
if err != nil { if err != nil {
@ -96,6 +88,20 @@ func New(config AuthenticatorConfig) (authenticator.Request, error) {
authenticators = append(authenticators, serviceAccountAuth) 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 { if len(config.KeystoneURL) > 0 {
keystoneAuth, err := newAuthenticatorFromKeystoneURL(config.KeystoneURL) keystoneAuth, err := newAuthenticatorFromKeystoneURL(config.KeystoneURL)
if err != nil { if err != nil {