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bao: serve the browser UI to admins via a loopback-only listener

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openbao gains a second listener, `ui`, on 127.0.0.1:<deploy.bao.uiPort>
(default 8204) with TLS off and no client-certificate requirement, and
`ui = true`. The existing listeners are unchanged. An nginx inside the
store's container, on 127.0.0.1:<deploy.bao.uiProxyPort> (default 8206),
forwards only /ui/ and /v1/ to it, redirects / to /ui/, answers 403 on
sys/unseal, sys/seal, sys/step-down, sys/rekey* and sys/generate-root*,
and 404 on everything else.

The gateway on the store's host serves `swarm.bao.ui.domain` (default
bao-ui.<swarm>) behind the authelia auth_request subrequest, proxying to
that nginx; the name joins serviceDomains and localNames like every
other gateway-published swarm service. authelia gets an access_control
rule restricting that name to group:admins, rendered wherever authelia
runs, since the default policy admits any session.

Trade-off, ruled by the operator on the parent issue: the UI listener
asks for no client certificate, so on that door a bao token alone is the
credential.

Three comments and a doc line claimed every API listener demands a
client certificate; they now except the loopback UI listener. The
module-eval case counting declared listeners excludes `ui` by name, as
it already did `metrics`.

On a self-signed gateway, the UI's name is a swarm service name, so its
host requests the services leaf from the store. `swarm-services-cert`
sits Before= and RequiredBy= the gateway's cert import, which nginx
Requires=. On a host whose only swarm name is the UI, that would hold
nginx, and with it the stream passthrough every reader dials, on a login
to a store that may be sealed. hive-tls drops those two edges exactly
when the UI is the only local swarm name: nginx starts on the existing
hive-leaf fallback, and the script's existing re-import reloads nginx
once the leaf issues. Every other host keeps both edges.
This commit is contained in:
atlas 2026-09-28 17:28:59 +02:00 • committed by mara
commit 3898ca33c7
10 changed files with 376 additions and 29 deletions
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8
nix/host-modules/swarm-authelia.nix
View file

@ -1508,6 +1508,14 @@ in
domain = swarmDomain;
subject = [ "group:${operatorGroup}" ];
policy = "one_factor";
}
# The store's browser UI. Not keyed to a deploy flag: its
# vhost is on the store's host, which need not be this
# one, and without this rule any session passes it.
++ lib.optional (swarmDomain != null) {
domain = hyperhiveCfg.swarm.bao.ui.domain;
subject = [ "group:${operatorGroup}" ];
policy = "one_factor";
};
};