feat: passwordless OIDC service-to-service auth#1876
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Allow unauthenticated access to OIDC discovery endpoints by deploying the oidc-reviewer ClusterRoleBinding to all site and global clusters.
The chart gained native pod.etcSources support for cinder-ks-etc back in Feb 2026 (upstream commit 06a5261a0), which unconditionally declares a cinder-etc-snippets volume (projected, or an emptyDir fallback when etcSources is empty). Our own pod.mounts override predates that (Sep 2025) and injects a volume of the same name, so every cinder Deployment/CronJob ended up with two "cinder-etc-snippets" volumes. Switch to pod.etcSources for the components that support it and drop the now-redundant custom mounts. cinder_db_sync keeps its manual mount since that job template has no etcSources support.
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Summary
Implements passwordless Keystone service authentication for OpenStack service-to-service calls, replacing static Keystone passwords with Kubernetes service-account (SA) token exchange via OIDC federation. Rationale and design are captured in ADR030: OpenStack Services OIDC Authentication.
Each service pod now uses its auto-mounted SA token to obtain a short-lived Keystone token from a per-cluster OIDC federation endpoint, instead of a long-lived static password pre-generated and distributed per site. Database and RabbitMQ credentials are out of scope and unchanged.
Changes
mod_auth_openidcvia the Ubuntu package (2bb34ec) and bootstrap the k8s-service-account OIDC identity provider, mapping rules, group, and role during deploy (393f5cd).keystone-service-usersecrets are now generated via OIDC federation instead of static passwords (a3ee547).oidc-rbaccomponent: new component that deploys aClusterRoleBindinggranting anonymous access to the Kubernetes OIDC discovery/JWKS endpoints, required for Keystone to validate SA tokens issued by each source cluster (311fa7c).keystoneauth-kubeservicetoken: new customkeystoneauth1plugin (v3oidcaccesstokenfile) that reads the pod's SA token, exchanges it for a Keystone token, and transparently re-exchanges on expiry — the built-inv3oidcaccesstokenplugin only exchanges once and doesn't handle re-authentication (083f2a4, openspec proposal ine82a8c8).auth_type = v3oidcaccesstokenfile(aa355d9).ironic-ks-user-baremetaljob/configmap that pre-provisioned a static Ironic baremetal service user (8a01a80); dropped a redundantcinder-etc-snippetsvolume declaration that duplicated one added upstream in OSH (6a8821e).chore: upgraded OpenStack to 2026.1 (a64dc4a) and bumped OSH charts/images (89d7cd4) as prerequisites.Validation
First deploy-repo rollout is staged for
rax-dev-iad3-devin undercloud-deploy#1958, which depends on this PR being merged and released. It has been tested in dev and all of the components start without errors and seem to communicate well.