refactor(3202): authelia declares its own vhost and dns name

Moves the authelia vhost out of the gateway's vhosts.nix and its
`address=` rule out of dnsmasq.nix, into swarm-authelia.nix.

Both land inside that module's existing `cfg.enable` guard, which is
the load-bearing part: every hive in a swarm knows `authelia.url`, but
only the host that RUNS the container may claim the name. A client hive
declaring the vhost would answer for a service it does not run, and
publishing the DNS record would point every agent on its bridge at that
wrong answer.

The kit grows a fourth member, `errorPages`, because the vhost aims its
502/503/504 at the gateway's styled sso-unavailable page. Republished
rather than imported per module: a service rendering its own would drift
from the rest of the gateway the first time the theme changed.
This commit is contained in:
atlas 2026-08-13 12:50:55 +02:00
commit 56ab6d26c1
6 changed files with 91 additions and 56 deletions

View file

@ -36,53 +36,6 @@ let
publicPort = cfg.httpsPort;
publicPortSuffix = if publicPort == 443 then "" else ":${toString publicPort}";
# Authelia sub-domain vhost. `server_name = authelia.domain`, all of
# `/` → authelia. Empty attrset unless THIS host runs the container:
# every hive knows the swarm's `authelia.url`, but only the one
# serving it may claim the name — a client hive declaring this vhost
# would answer for a service it does not run.
#
# ⚠️ The server name must be exactly `autheliaCfg.domain`, not a
# near-miss: authelia validates `authelia_url ⊂ session cookie domain`
# at STARTUP, so a mismatch is a container that refuses to boot rather
# than a login that misbehaves.
#
# ⚠️ And deliberately NO `dashboardAuth` here. That block is the
# gateway's `auth_basic`; applying it to the SSO provider would put
# the login page behind the login mechanism it exists to replace.
autheliaVhost = lib.optionalAttrs autheliaCfg.enable {
"${autheliaCfg.domain}" = (vhostTlsFor autheliaCfg.domain) // {
listen = vhostListen;
extraConfig = securityHeaders;
locations."/" = {
proxyPass = "http://127.0.0.1:${toString autheliaCfg.port}/";
proxyWebsockets = true;
extraConfig = ''
proxy_buffering off;
# authelia decides by the ORIGINAL request, not by the hop it
# sees — the login redirect and the session cookie's domain
# both derive from these. Without them every request looks
# like it arrived at 127.0.0.1 over plain http.
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Uri $request_uri;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
# A dead upstream here means "not bootstrapped" far more often
# than "misconfigured proxy", and a bare 502 says the opposite.
proxy_intercept_errors on;
error_page 502 503 504 = /__hive_sso_unavailable;
'';
};
locations."= /__hive_sso_unavailable" = {
extraConfig = ''
internal;
alias ${errorPages.ssoUnavailable};
default_type text/html;
'';
};
};
};
# Swarm UI vhost — the swarm's front page, on the swarm apex, and the
# FIRST `auth_request` anywhere in this gateway (everything else is
# `auth_basic` + htpasswd).
@ -481,7 +434,7 @@ in
'';
};
}
// autheliaVhost
// matrixVhost
// swarmUiVhost;
}