The feature is currently in private alpha, so requires a tailnet feature
flag. Initially focuses on supporting the operator's own auth, because the
operator is the only device we maintain that uses static long-lived
credentials. All other operator-created devices use single-use auth keys.
Testing steps:
* Create a cluster with an API server accessible over public internet
* kubectl get --raw /.well-known/openid-configuration | jq '.issuer'
* Create a federated OAuth client in the Tailscale admin console with:
* The issuer from the previous step
* Subject claim `system:serviceaccount:tailscale:operator`
* Write scopes services, devices:core, auth_keys
* Tag tag:k8s-operator
* Allow the Tailscale control plane to get the public portion of
the ServiceAccount token signing key without authentication:
* kubectl create clusterrolebinding oidc-discovery \
--clusterrole=system:service-account-issuer-discovery \
--group=system:unauthenticated
* helm install --set oauth.clientId=... --set oauth.audience=...
Updates #17457
Change-Id: Ib29c85ba97b093c70b002f4f41793ffc02e6c6e9
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
Tom Proctor