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swarmctl: log in with the operator's own SSO account and reach the controller through the swarm domain

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`swarmctl --swarm https://<swarm> login` runs the OAuth 2.0
authorization-code flow with PKCE against the swarm's authelia as a new
public `swarmctl` client: a pushed authorization request, the browser login
and explicit consent, and the code delivered by form_post to a loopback
port. The access and refresh tokens are cached at mode 0600 under
$XDG_STATE_HOME/swarmctl/ and refreshed under a file lock, since authelia
rotates the refresh token and revokes the login when a used one is
presented again. With --swarm (or SWARMCTL_SWARM), the agent, schedule and
forge verbs send their requests to https://<swarm>/api/ with the bearer
token instead of over the controller's unix socket, which stays the default.

authelia registers the client on every authelia host with a swarm domain:
`kind = "native"`, public, no minted secret, scopes offline_access and
authelia.bearer.authz, audience https://<swarm>/api/ (matched as a URL
prefix), redirect http://127.0.0.1/callback (any loopback port). Every
field is one authelia 4.39.20's validator requires for a public client
holding the bearer scope.

The swarm apex's /api/ answers a refused caller that sent an
Authorization header with the 401 itself instead of the login redirect,
so the CLI can tell "log in again" apart from an answer; a browser still
gets the redirect. The bearer token is not forwarded to the controller.

Refs #4409 (mara: c94764, c94782).
This commit is contained in:
atlas 2026-10-11 23:43:29 +02:00 • committed by mara
commit 2df19e4899
17 changed files with 1118 additions and 122 deletions
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7
nix/host-modules/swarm-authelia-service.nix
View file

@ -171,6 +171,7 @@ in
type = lib.types.enum [
"interactive"
"machine"
"native"
];
default = "interactive";
example = "machine";
@ -185,6 +186,12 @@ in
client's own, so it receives an access token and no
id-token.
`native` is a public client a person runs on their own
machine (RFC 8252): no secret, authorization code with
PKCE through a loopback `redirectUris` entry, and a refresh
token. Its access token carries `authelia.bearer.authz`
for its `audience`, so the gateway admits it as that person.
This is declared rather than inferred from an empty
`redirectUris`, because authelia permits only the grants a
client names — omitting `grant_types` yields