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hive-matrix: keep tuwunel's OIDC secret on the host's /run, not in the container's root

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swarm-bao-matrix-oidc still reads the secret from bao under matrix-ctl's
leaf, but now writes it to /run/hive-matrix-oidc on the host (tmpfs), which
the container bind-mounts read-only for tuwunel's LoadCredential. Before, it
wrote it to
/var/lib/nixos-containers/hive-matrix/var/lib/tuwunel-oidc/<id>.secret on
persistent disk, where a superseded secret stayed after rotation and went
into backups of the container root. Host tmpfiles now removes that old file.

clientSecretFile must now lie under /run/hive-matrix-oidc/, the one directory
the container shares; any other value fails at evaluation.

Rotation is unchanged: the ten-minute timer rewrites the file when the value
differs and refresh_consumer restarts tuwunel. After a reboot the secret is
fetched again; until the store answers, tuwunel does not start.

Part of #4998 (slice 4: tuwunel).
This commit is contained in:
atlas 2026-10-15 21:33:19 +02:00 • committed by mara
commit 25d282427f
4 changed files with 74 additions and 24 deletions
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2
docs/swarm/secrets.md
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@ -253,7 +253,7 @@ such as the root token.
| hive leaf certs | `hive-tls.nix`, issued by the secret store's `pki` mount | `<deploy.hive-controller.tls.stateDir>/<name>.pem` |
| the hive's own store identity | `glue-bao-tls.nix` on the store's host; placed by hand on every other host ([`ca.md`](ca.md#the-gateway-leaf-comes-from-the-secret-store)) | `deploy.hive-controller.tls.baoHiveIdentityCertFile` / `baoHiveIdentityKeyFile` |
| the forge's copy of its OIDC secret | `swarm-bao-forge-oidc.service` reads it out of the swarm secret store under the forge publisher's leaf, wherever authelia runs | `/run/hive-forge-oidc/<id>.secret` on the host (tmpfs), bound into the forge container, handed to `forgejo-sso-source` through `LoadCredential` |
| the homeserver's copy of its OIDC secret | `swarm-bao-matrix-oidc.service` reads it out of the swarm secret store under matrix-ctl's leaf, wherever authelia runs | `/var/lib/tuwunel-oidc/<id>.secret`, handed to tuwunel through `LoadCredential` |
| the homeserver's copy of its OIDC secret | `swarm-bao-matrix-oidc.service` reads it out of the swarm secret store under matrix-ctl's leaf, wherever authelia runs | `/run/hive-matrix-oidc/<id>.secret` on the host (tmpfs), bound into the homeserver container, handed to tuwunel through `LoadCredential` |
| the agent containers' queue credential | authelia, published to the store by `swarm-secret-publish` | `<deploy.hive-controller.queue.agentCredentialDir>/secret` (`0600`) and `/client_id` (`0644`) |
The forge and the homeserver read their copies out of the store, the way