This change updates the generic webhook logic to use a rest.Config
as its input instead of a kubeconfig file. This exposes all of the
rest.Config knobs to the caller instead of the more limited set
available through the kubeconfig format. This is useful when this
code is being used as a library outside of core Kubernetes. For
example, a downstream consumer may want to override the webhook's
internals such as its TLS configuration.
Signed-off-by: Monis Khan <mok@vmware.com>
This change updates the OIDC authenticator code to use a subset of
the dynamiccertificates.CAContentProvider interface to provide the
root CA bytes. This removes the hard dependency on a file based CA
and makes it easier to use this code as a library.
Signed-off-by: Monis Khan <mok@vmware.com>
This change removes support for basic authn in v1.19 via the
--basic-auth-file flag. This functionality was deprecated in v1.16
in response to ATR-K8S-002: Non-constant time password comparison.
Similar functionality is available via the --token-auth-file flag
for development purposes.
Signed-off-by: Monis Khan <mok@vmware.com>
This change removes the audience logic from the oidc authenticator
and collapses it onto the same logic used by other audience unaware
authenticators.
oidc is audience unaware in the sense that it does not know or
understand the API server's audience. As before, the authenticator
will continue to check that the token audience matches the
configured client ID.
The reasoning for this simplification is:
1. The previous code tries to make the client ID on the oidc token
a valid audience. But by not returning any audience, the token is
not valid when used via token review on a server that is configured
to honor audiences (the token works against the Kube API because the
audience check is skipped).
2. It is unclear what functionality would be gained by allowing
token review to check the client ID as a valid audience. It could
serve as a proxy to know that the token was honored by the oidc
authenticator, but that does not seem like a valid use case.
3. It has never been possible to use the client ID as an audience
with token review as it would have always failed the audience
intersection check. Thus this change is backwards compatible.
It is strange that the oidc authenticator would be considered
audience unaware when oidc tokens have an audience claim, but from
the perspective of the Kube API (and for backwards compatibility),
these tokens are only valid for the API server's audience.
This change seems to be the least magical and most consistent way to
honor backwards compatibility and to allow oidc tokens to be used
via token review when audience support in enabled.
Signed-off-by: Monis Khan <mok@vmware.com>
This package contains public/private key utilities copied directly from
client-go/util/cert. All imports were updated.
Future PRs will actually refactor the libraries.
Updates #71004
The striped cache used by the token cache is slightly more sophisticated
however the simple cache provides about the same exact behavior. I used
the striped cache rather than the simple cache because:
* It has been used without issue as the primary token cache.
* It preforms better under load.
* It is already exposed in the public API of the token cache package.
Fixes lint errors in kubeapiserver/admission, kubeapiserver/authorizer,
kubeapiserver/authenticator. Also enables lint testing of these
directories.
Fixed go format.
Fixed changes from config.
The service account authenticator isn't the only authenticator that
should respect API audience. The authentication config structure should
reflect that.
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
oidc authentication: switch to v2 of coreos/go-oidc
Switch to v2 of [coreos/go-oidc](https://github.com/coreos/go-oidc), which uses square/go-jose to verify tokens and supports more signing algorithms.
Most of this PR removes dependencies used by the older version of github.com/coreos/go-oidc, and updates vendor files.
This PR has been tested against tokens issued by Okta, Google, and CoreOS's dex.
Closes https://github.com/kubernetes/kubernetes/issues/57806
```release-note
kube-apiserver: the OpenID Connect authenticator can now verify ID Tokens signed with JOSE algorithms other than RS256 through the --oidc-signing-algs flag.
kube-apiserver: the OpenID Connect authenticator no longer accepts tokens from the Google v3 token APIs, users must switch to the "https://www.googleapis.com/oauth2/v4/token" endpoint.
```
cc @rithujohn191 @liggitt
cc @kubernetes/sig-auth-pr-reviews
experimental-keystone-url and experimental-keystone-ca-file were always
experimental. So we don't need a deprecation period.
KeystoneAuthenticator was on the server side and needed userid/password
to be passed in and used that to authenticate with Keystone. We now
have authentication and authorization web hooks that can be used. There
is a external repo with a webook for keystone which works fine along
with the kubectl auth provider that was added in:
a0cebcb559
So we don't need this older style / hard coded / experimental code
anymore.
Right now if a JWT for an unknown issuer, for any subject hits the
serviceaccount token authenticator, we return a errors as if the token
was meant for us but we couldn't find a key to verify it. We should
instead return nil, false, nil.
This change helps us support multiple service account token
authenticators with different issuers.
Add the following flags to control the prefixing of usernames and
groups authenticated using OpenID Connect tokens.
--oidc-username-prefix
--oidc-groups-prefix
