infra/stacks/authentik/admin-services-restriction.tf
Viktor Barzin 5c378dd5e3
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workstation: gate t3.viktorbarzin.me to the T3 Users group (Phase 4)
New authentik_group 'T3 Users' (members wizard/emo/ancamilea via data lookups — usernames ARE their emails in this Authentik instance) + a branch in the admin-services-restriction expression policy gating t3.viktorbarzin.me to that group, placed BEFORE the ADMIN_ONLY_HOSTS early-return. Surgical two-step targeted apply (group-with-members first, then the gate) → zero lock-out window. Verified: group has all 3 members, the live policy contains the t3 branch, t3 still 302s to Authentik. Membership is HCL for now (FUTURE: roster-reconciled via the Authentik API).

Note: the authentik stack had 3 unrelated pending drift changes (pgbouncer deployment + 2 tls_secrets) — deliberately NOT applied (targeted apply isolated this change; left for the stack owner).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-08 17:50:40 +00:00

70 lines
2.8 KiB
HCL

# Catch-all forward-auth restriction: gate the admin-only hostnames to the
# "Home Server Admins" group. Bound to the "Domain wide catch all" application
# (binding stays UI-managed; only the expression is adopted here).
#
# Adopted into Terraform 2026-06-04 to add a carve-out: the Kubernetes Dashboard
# (k8s.viktorbarzin.me) ALSO admits the kubernetes-* RBAC groups, so
# namespace-owners (e.g. gheorghe) can reach the dashboard login page. The
# dashboard itself enforces per-namespace access via the pasted ServiceAccount
# token (stacks/rbac/modules/rbac/dashboard-sa.tf) — this policy only controls
# who reaches the page. All other admin-only hosts remain Home-Server-Admins-only.
import {
to = authentik_policy_expression.admin_services_restriction
id = "07a11b85-8f37-4844-aebb-ac9c112ec87c"
}
resource "authentik_policy_expression" "admin_services_restriction" {
name = "admin-services-restriction"
expression = trimspace(<<-EOT
ADMIN_ONLY_HOSTS = {
"terminal.viktorbarzin.me",
"frigate.viktorbarzin.me",
"netbox.viktorbarzin.me",
"trading.viktorbarzin.me",
"speedtest.viktorbarzin.me",
"meshcentral.viktorbarzin.me",
"k8s.viktorbarzin.me",
"dashy.viktorbarzin.me",
"prowlarr.viktorbarzin.me",
"qbittorrent.viktorbarzin.me",
"listenarr.viktorbarzin.me",
"shlink.viktorbarzin.me",
"openclaw.viktorbarzin.me",
"openlobster.viktorbarzin.me",
"wealthfolio.viktorbarzin.me",
}
ADMIN_GROUP = "Home Server Admins"
# The K8s Dashboard additionally admits the Kubernetes RBAC groups. Access
# to the page is not the security boundary — the pasted ServiceAccount token
# is (per-namespace admin + cluster read-only). See dashboard-sa.tf.
K8S_DASHBOARD_HOST = "k8s.viktorbarzin.me"
K8S_DASHBOARD_GROUPS = [
"Home Server Admins",
"kubernetes-admins",
"kubernetes-power-users",
"kubernetes-namespace-owners",
]
host = request.context.get("host", "")
# t3 Workstation edge gate: only members of "T3 Users" may reach t3.
# Placed BEFORE the ADMIN_ONLY_HOSTS early-return (t3 is intentionally not in
# that set — it must not require Home-Server-Admins, just T3 Users membership).
if host == "t3.viktorbarzin.me":
return ak_is_group_member(request.user, name="T3 Users")
# Not an admin-only host: allow any authenticated user.
if host not in ADMIN_ONLY_HOSTS:
return True
# K8s Dashboard: allow admins OR any Kubernetes RBAC group.
if host == K8S_DASHBOARD_HOST:
return any(ak_is_group_member(request.user, name=g) for g in K8S_DASHBOARD_GROUPS)
# Every other admin-only host: Home Server Admins only.
return ak_is_group_member(request.user, name=ADMIN_GROUP)
EOT
)
}