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hive CA: delete ca.pem, ca-previous.pem and ca-key.pem, the bundle is the store's root

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The gateway leaf comes from the store's pki mount, so a hive CA's
certificates anchor nothing and its key is a secret outside the store.

- hive-tls-ca writes trust-bundle.pem from swarm-services-root.pem alone;
  the ca.pem and ca-previous.pem slots are gone.
- Every host deletes ca.pem, ca-previous.pem and ca-key.pem in
  deploy.hive-controller.tls.stateDir with tmpfiles `r` rules that follow
  the option. The removal shim, now host-ca-removed.nix, holds these
  beside the /var/lib/swarm-ca rule and the swarm.ca.* removals.
- deploy.bao.clientCaFile, deploy.bao.serverCaFile and
  deploy.swarm-controller.hiveClientCaFile naming /var/lib/swarm-ca or one
  of the deleted hive CA files fail evaluation, naming the store's mTLS CA
  (/var/lib/swarm-bao-pki/ca.pem on the store's host) as the replacement.

module-eval hive-tls covers the single-anchor bundle, the deletion (incl.
a relocated stateDir) and the assertion on all three options.

Refs #4588
This commit is contained in:
atlas 2026-10-05 19:54:55 +02:00 • committed by mara
commit 4e5a642928
10 changed files with 170 additions and 122 deletions
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2
docs/networking/gateway.md
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@ -80,7 +80,7 @@ The issuer is the **secret store's `pki` mount**, not a bare self-signed leaf. `
**Why an issuer, not a bare leaf**: a bare self-signed leaf is its own trust anchor, so every regeneration is a new anchor every consumer must re-trust, and an agent's build sets its trust store once, before any leaf exists. Agents and federation peers trust the store's root once; leaf rotation never breaks them.
**What consumers trust**: `trust-bundle.pem` in the same state dir. It carries the store's `pki` root, plus a hive CA's public `ca.pem` where one exists ([`swarm/ca.md`](../swarm/ca.md#the-trust-bundle)). nginx serves the leaf alone, since its issuer is a self-signed root. Agents (via `security.pki.certificateFiles`), the CI and forge containers and federating peers all read the bundle.
**What consumers trust**: `trust-bundle.pem` in the same state dir. It carries the store's `pki` root ([`swarm/ca.md`](../swarm/ca.md#the-trust-bundle)). nginx serves the leaf alone, since its issuer is a self-signed root. Agents (via `security.pki.certificateFiles`), the CI and forge containers and federating peers all read the bundle.
**Why on by default**: matrix-dart-sdk (FluffyChat's SDK) fetches `https://<host>/.well-known/matrix/client` and never falls back to plain http, so without TLS the browser client can't bootstrap.