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43
docs/swarm/secrets.md
View file

@ -42,7 +42,7 @@ neither is a renaming of the other.
## Swarm-level — one of each per swarm
| secret | generated by | lives at | hive elsewhere |
| --------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| --------------------------------------------------- | ---------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| swarm root CA cert | `swarm-ca.nix` first-boot unit, when `autoConfigure` is set | `/var/lib/swarm-ca/root.pem` | operator copies the **cert** in; it's public |
| swarm root CA key | same unit | `/var/lib/swarm-ca/root-key.pem`, `0600` | stays on whichever host holds it — see the constraint below |
| swarm-services sub-CA (cert + key) | `swarm-ca.nix`, signed by the root | `/var/lib/swarm-ca/services-ca{,-key}.pem` | issued where the root lives |
@ -52,7 +52,6 @@ neither is a renaming of the other.
| OIDC client secret, plaintext half | `authelia crypto hash generate --random` | `/var/lib/authelia-swarm/oidc-clients/<id>.secret` | operator provides the file and names it in whichever option reads it — `sso.clientSecretFile` for a service, `otel.clientSecretFile` for the hive's telemetry collector |
| OIDC client secret, digest half | the same mint | `oidc-clients/<id>.digest` | authelia's own half; merged at runtime via `settingsFiles` |
| the swarm collector's copy of its OIDC secret | `swarm-otel-oidc-secret.service` copies it from authelia's tree, **when authelia runs on this host** | `/var/lib/swarm-otel-oidc/<id>.secret` inside the `swarm-otel` container | operator provides the file and names it in `deploy.swarm-otel.clientSecretFile` — the collector need not share a host with authelia |
| Grafana's copy of its OIDC secret | `swarm-bao-grafana-oidc.service` reads it out of the swarm secret store, **on every host that runs Grafana** | `/var/lib/grafana-oidc/<id>.secret` inside the `swarm-grafana` container | same unit, same path — one route, co-located or not. Nothing for an operator to place beyond this host's store leaf, see below |
| authelia subject store | `swarmctl` and `swarm-authelia-bridge` | `users.yml` — one file, read and written by both | `swarmctl`, on the host that runs authelia |
| wireguard private key | **the operator** — `wg genkey` | whatever `deploy.wireguard.privateKeyFile` names | always operator-provided; nothing generates this for you |
| queue auth-callout nkeys (user seed + account seed) | `swarm-nats-callout-keys` first-boot unit, when `deploy.nats.autoGenerateCallout` is set | `/var/lib/swarm-nats-callout/{callout-user,issuer}.seed`, `0600` | operator mints both with `nk` and names them in `deploy.nats.calloutUserSeedFile` / `deploy.nats.calloutIssuerSeedFile` |
@ -184,46 +183,6 @@ files aren't there the daemon forwards nothing and says so in its journal, and
the harness logs that it has no queue coordinates — the same absent-and-legal state, twice,
rather than a container that refuses to start.
The **third reader** is Grafana's OIDC client secret, and it's the first one
that's a _swarm service's_ own credential rather than a hive's. It has exactly
one delivery route: `swarm-bao-grafana-oidc.service` reads
`swarm/services/<client-id>/oidc/client` out of the store, on **every** host
that runs Grafana. Where authelia is doesn't enter into it — the publisher on
authelia's host writes that path whether the reader is a network away or in the
container next door.
That's a deliberate refusal of the shortcut. Copying the plaintext
straight out of authelia's tree when the two happen to share a host is one
round trip cheaper and costs a second delivery unit, a second way for the file
to be wrong, and a gate deciding between them — and the gate is the expensive
part, because whatever it's wrong about is an outage nobody can read. The store
exists so a host holds **one** out-of-band secret, its client certificate, and
reads everything else with it.
Two things follow, and `swarm-grafana.nix` asserts both rather than degrading:
running Grafana requires `swarm.authelia.url` (its local login form is disabled
unconditionally, so SSO isn't a feature of some topologies — it's the only way
in), and it requires this host's `deploy.bao.clientCertFile` /
`clientKeyFile`. Each refusal names the option to set. Both used to be silent:
a null URL dropped the OIDC block, a missing leaf produced a warning, and
either one left a Grafana with no SSO and no password box — nothing failed, so
nothing said anything. Registration is separate and stays where authelia is
(`glue-grafana-oidc-client.nix`): a client is a row in authelia's own config,
so it's declared on the host running authelia, which isn't necessarily the host
running Grafana.
A service's secret is one value for the whole swarm rather than one per hive, so
it lives under the `services` prefix, and a hive's read policy grants that prefix
whole. That's because nothing in a swarm's configuration records which hive runs
a given service — placement is a `deploy.*` fact, per-host by definition — so
there is nothing to scope the grant to. Every hive can therefore read every swarm
service's client secret; that's the cost of a shape where the service's host has
no store identity of its own to present, and it's stated in
`swarm-secret-client`'s `policy` module beside the grant itself. Absence behaves
as it does for the other two readers: a store that says "not here" leaves the
file alone and says so, since there is no such thing as a locally valid OIDC
client secret to stand in.
⚠️ **Service↔store mTLS is its own trust domain.** A credential you must
already hold to authenticate can't be fetched from the thing it authenticates
you to, so the store's identity can't come from an authority the store

20
docs/trust-boundary/security.md
View file

@ -60,22 +60,10 @@ advertises a boundary it doesn't actually hold. A wide grant that says what it
is beats a narrow one that only looks narrow.
What still holds: the grant is **read-only** (a hive can't write an agent's
credential, so it can't hand itself an agent's identity), and it reaches three
prefixes and nothing else in the store — every agent's credentials, the reader's
_own_ entry under the hive namespace, which names the hive asking and so widens
nothing between them, and every **swarm service's** OIDC client secret.
That third prefix has the same shape of reason as the first, and the same honest
cost. A swarm service (Grafana is the one there today) registers **one** client
for the whole swarm, so its credential's path names the service and never the
host — and which hive runs a given service is a `deploy.*` fact, per-host by
definition, so nothing swarm-wide exists to scope the grant to. The host running
such a service has no store identity of its own either; it reads with the
certificate of the hive it is. **Any hive can therefore read any swarm service's
client secret**, which is worth what it buys: every swarm service gets its
credential the same way from anywhere, instead of only where the identity
provider happens to sit. Giving such a service its own store identity is what
would remove this rather than re-scope it.
credential, so it can't hand itself an agent's identity), and it reaches two
prefixes and nothing else in the store — every agent's credentials, and the
reader's _own_ entry under the hive namespace, which names the hive asking and
so widens nothing between them.
**A tracked follow-up** narrows this, with the two candidate directions: scope
the grant per hive (and pay for the re-emission), or give each agent container

1
nix/host-modules/default.nix
View file

@ -25,7 +25,6 @@
./otel.nix
./glue-bao-tls.nix
./glue-controller-bao-identity.nix
./glue-grafana-oidc-client.nix
./glue-matrix-bao-token.nix
./glue-queue-agent-credential.nix
./glue-secret-publisher-bao-identity.nix

51
nix/host-modules/glue-grafana-oidc-client.nix
View file

@ -1,51 +0,0 @@
# Glue: register the swarm's Grafana as an OIDC client wherever authelia runs.
#
# ONE PAIRING PER FILE — grafana ← authelia, and nothing else. Deleting this
# leaves a swarm whose metrics UI is not a client authelia has ever heard of, so
# no login against it can complete and nothing minted its secret either.
#
# ⚠️ Gated on authelia being HERE, and deliberately NOT on this host running
# Grafana. A client is a row in THIS host's provider config, so it can only be
# declared where that config is rendered — and ./swarm-grafana.nix's whole
# `config` block hangs off `deploy.grafana.enable`, so a swarm with Grafana and
# authelia on different hosts registered the client nowhere at all.
# ./hive-forge/default.nix is already on the right side of that line: its module
# is gated on `hyperhive.enable` and only the registration asks about authelia.
# This file puts Grafana there without moving the rest of its module.
#
# ⚠️ Registered whether or not the swarm has a Grafana, because nothing in
# `swarm.*` records that — `deploy.grafana.enable` answers "does THIS host run
# it", and a swarm-wide answer does not exist. The cost is one unused client
# and one unused minted secret in a swarm with no metrics UI. The alternative
# was a new swarm-wide option an operator must set before a split deployment
# works, which leaves the reported failure in place for everyone who does not
# know to set it. ./swarm-otel.nix made the same call for its own client when it
# dropped the published-scrape-target guard: a client that may go unused beats a
# guard that reads as done and renders nothing.
{
lib,
config,
...
}:
let
hyperhiveCfg = config.services.hyperhive;
deployCfg = hyperhiveCfg.deploy;
grafanaCfg = hyperhiveCfg.swarm.grafana;
in
{
config = lib.mkIf (hyperhiveCfg.enable && deployCfg.authelia.enable) {
# One declaration, two readers. Grafana's callback URL is format-locked to
# its own root URL, and the read-only option it is taken from is where that
# format is spelled — restating it here would be a second source of truth
# for a string whose mismatch is a silently rejected login.
#
# `kind` is left at its `interactive` default: a person logs in here.
services.hyperhive.swarm.authelia.oidc.clients = [
{
id = grafanaCfg.oidc.clientId;
description = "HyperHive swarm metrics";
redirectUris = [ grafanaCfg.oidc.redirectUri ];
}
];
};
}

15
nix/host-modules/swarm-bao.nix
View file

@ -210,17 +210,14 @@ let
secretPublisherPolicyName = "swarm-secret-publisher";
secretPublisherCn = baoDeploy.secretPublisherCommonName;
# Two grants, and every narrowing in each is load-bearing.
# One grant, and every narrowing in it is load-bearing.
#
# `secret/data/` is KV v2's ACL prefix, inserted by the engine rather than
# written by the caller — same trap as the controller's grant above.
#
# Two prefixes and not `swarm/*`: this principal has no business with an
# agent's credentials or the controller's, and these two are the only paths
# it produces. It grew the `services/` one when the publisher gained a swarm
# service's OIDC secret to copy, which is the rule ../module-eval.nix states
# for the controller's side of the same wall — a grant widens when a path
# gains a WRITER, not when a kind is declared.
# `hives/` and not `swarm/*`: this principal has no business with an agent's
# or a service's credentials, and the hive prefix is the only one whose paths
# it produces.
#
# Write-only. It copies secrets in and never reads one back; a read
# capability would let a file-copier recover every hive's credentials.
@ -228,10 +225,6 @@ let
path "${credentialMountPath}/data/swarm/hives/*" {
capabilities = ["create", "update"]
}
path "${credentialMountPath}/data/swarm/services/*" {
capabilities = ["create", "update"]
}
'';
# The KV v2 engine the controller writes agent credentials through. Named

346
nix/host-modules/swarm-grafana.nix
View file

@ -21,8 +21,6 @@ let
hyperhiveCfg = config.services.hyperhive;
gatewayCfg = hyperhiveCfg.gateway;
autheliaCfg = hyperhiveCfg.swarm.authelia;
baoCfg = hyperhiveCfg.swarm.bao;
baoDeploy = deployCfg.bao;
vmCfg = hyperhiveCfg.swarm.victoriametrics;
vlCfg = hyperhiveCfg.swarm.victorialogs;
swarmDomain = hyperhiveCfg.swarm.domain;
@ -80,30 +78,10 @@ let
# operator sees, not a coercion error from here.
domainBase = if swarmDomain == null then "invalid" else swarmDomain;
# Is SSO configured for this SWARM. Swarm-wide by construction — `swarm.*` is
# identical on every host — and the option's own description is what makes
# this the right question to ask: a null URL means "no SSO configured".
#
# 🩸 A subject of an assertion below, NOT a gate. Dropping the OIDC block when
# this is false looks conservative and is the outage: `disable_login_form` is
# unconditional a few hundred lines down, so a Grafana with no OIDC settings
# is a Grafana with no login of any kind, arrived at silently. SSO is a
# requirement of running this service, so an unconfigured swarm fails to
# build and says which option to set.
ssoConfigured = autheliaCfg.url != null;
# A reader of the store is defined by holding a certificate the store
# accepts, never by standing next to it — the rule
# ./glue-matrix-bao-token.nix states in full.
#
# Also asserted rather than gating anything, and that is the ruling this
# module's second delivery route was deleted under: the store exists so that
# ONE secret is placed out of band per host — this certificate — and every
# other secret is read with it. A Grafana host without it has not been given
# its identity yet, which is a thing to say out loud rather than to route
# around by reaching into authelia's tree whenever it happens to be local.
haveClientIdentity = baoDeploy.clientCertFile != null && baoDeploy.clientKeyFile != null;
# The all-local case: this host runs BOTH Grafana and the swarm's authelia,
# so the minted secret can be moved without an operator. Same split the
# forge and matrix modules document.
ssoLocal = deployCfg.grafana.enable && deployCfg.authelia.enable;
autheliaUrl = toString autheliaCfg.url;
# Where the plaintext lands inside the container. Under /var/lib rather
@ -112,24 +90,6 @@ let
# intermittent one.
secretPath = "/var/lib/grafana-oidc/${cfg.oidc.clientId}.secret";
# The same file seen from the host, which is where the delivery unit writes
# it. Spelled once: the unit that writes it and the config that names it are
# a few hundred lines apart, and a Grafana reading a path nothing writes is
# a login that fails with nothing in any log about the file.
hostSecretPath = "/var/lib/nixos-containers/${cfg.machine}${secretPath}";
hostSecretDir = builtins.dirOf hostSecretPath;
# Where the publisher on authelia's host leaves this client's secret. The
# `services` segment is `swarm-secret-client`'s `path::Kind::Service` — a
# swarm service's client is registered once for the whole swarm, so its
# secret is one value and not one per hive. Both ends compose this from the
# same swarm-wide client id, so a rename cannot leave one of them behind.
#
# ⚠️ The prefix is not decoration: it is what this host's read grant covers,
# so a path outside it answers 403 rather than a miss, however correct it
# looks.
storeSecretPath = "secret/swarm/services/${cfg.oidc.clientId}/oidc/client";
# Grafana's own datasource-encryption key. Generated in-container (see the
# unit below) because nothing outside the container ever reads it — unlike
# the OIDC secret above, whose other reader is authelia's container.
@ -144,6 +104,11 @@ let
nginxGid = config.ids.gids.nginx;
grafanaUid = config.ids.uids.grafana;
# Format-locked by Grafana: the generic OAuth callback is always
# `<root_url>/login/generic_oauth`. Declared once here and read by both
# the authelia client and Grafana itself.
redirectUri = "https://${cfg.domain}/login/generic_oauth";
in
{
# `enable` moved to `services.hyperhive.deploy.grafana.enable` — see
@ -221,25 +186,6 @@ in
'';
};
redirectUri = lib.mkOption {
type = lib.types.str;
readOnly = true;
default = "https://${cfg.domain}/login/generic_oauth";
defaultText = lib.literalExpression ''"https://''${services.hyperhive.swarm.grafana.domain}/login/generic_oauth"'';
description = ''
OAuth callback authelia sends the browser back to, and the URI it
matches **exactly**.
Read-only, like {option}`services.hyperhive.swarm.grafana.machine`
and for the same reason: Grafana derives it from its own
`root_url` (`<root_url>/login/generic_oauth`), so it is a fact
other modules may read rather than a knob. The glue that registers
this client wherever authelia runs reads it from here instead of
restating the format — a second spelling of it is a silently
rejected login.
'';
};
role = lib.mkOption {
type = lib.types.enum [
"Viewer"
@ -390,16 +336,10 @@ in
# The secret oneshots as well as grafana itself: each runs before it and
# fails in ways grafana then reports only as a login that does not work.
#
# Unconditional, because every unit named here now renders in every
# deployment. This list used to be assembled with `lib.optional` per
# delivery route, which was the right shape while there were two — a unit
# name that never renders is a journald scrape target matching nothing,
# which reads as a quiet unit rather than an absent one.
services.hyperhive.swarm.otel.journaldUnits = [
"grafana"
"swarm-grafana-oidc-secret"
"swarm-grafana-secret-key"
"swarm-bao-grafana-oidc"
];
services.hyperhive.swarm.controller.links = [
@ -410,61 +350,35 @@ in
}
];
# Registering the client is NOT here any more: it has to happen on the
# host that runs authelia, and this whole block is gated on the host that
# runs Grafana. ./glue-grafana-oidc-client.nix is where it moved to.
# One declaration, two readers. Grafana's callback URL is format-locked
# to its own root URL; making the operator restate it in authelia's
# client list would be a second source of truth for a string whose
# mismatch is a silently rejected login.
#
# `kind` is left at its `interactive` default: a person logs in here.
services.hyperhive.swarm.authelia.oidc.clients = lib.mkIf ssoLocal [
{
id = cfg.oidc.clientId;
description = "HyperHive swarm metrics";
redirectUris = [ redirectUri ];
}
];
# Both arms are what used to be a silent gate, and both fire only where
# Grafana runs — this whole block is under `deploy.grafana.enable`. The
# binding itself is asserted rather than a copy of its formula, the way
# ./swarm-nats.nix's own `autheliaUrl` arm does it: two spellings of one
# boolean is two places for a future edit to land in only one.
assertions = [
{
# SSO is not optional for this service, and the reason is a hundred
# lines below in `auth.disable_login_form = true`: Grafana ships an
# `admin`/`admin` account on a public vhost, so the password box is
# off whatever the topology. Emitting no OIDC block when the swarm
# names no IdP therefore produces a container with no way in at all —
# a state no log names, since nothing failed. Failing the build and
# naming the option is the only report that reaches anyone.
assertion = ssoConfigured;
# Grafana reaches the token endpoint server-to-server, so a null URL
# would become a request to `null/api/oidc/token` — a DNS failure
# several layers from its cause. Only reachable by enabling authelia
# and clearing its `url`, which is why it is an assertion and not a
# fallback.
assertion = !ssoLocal || autheliaCfg.url != null;
message = ''
services.hyperhive.deploy.grafana.enable requires
services.hyperhive.swarm.authelia.url — Grafana's only login is SSO,
because its local login form is disabled unconditionally (it ships
an admin/admin account and its vhost is on the public gateway).
services.hyperhive.swarm.grafana requires
services.hyperhive.swarm.authelia.url when authelia is enabled.
It defaults to this host's own instance only when this host runs
authelia. A hive that federates with a swarm sets it explicitly to
wherever that provider lives. Grafana exchanges its authorization
code at `''${url}/api/oidc/token` from inside its container, so a
null URL leaves no endpoint to name.
'';
}
{
# The other half of one login: the OIDC block names a `$__file{}` that
# `swarm-bao-grafana-oidc.service` below writes, and that unit reads
# the store with this host's client certificate. No certificate, no
# secret, and the same no-way-in Grafana as the arm above.
assertion = haveClientIdentity;
message = ''
services.hyperhive.deploy.grafana.enable requires this host to hold a
swarm-secret-store client identity: set both
services.hyperhive.deploy.bao.clientCertFile
services.hyperhive.deploy.bao.clientKeyFile
Grafana's OIDC client secret is minted by authelia and read out of
the store, on every host that runs Grafana — including the host that
runs authelia. That is one delivery route rather than two, and it is
what the store is for: this certificate is the single credential
placed out of band, and every other secret comes from the store with
it.
On a hive that runs the store, glue-bao-tls.nix supplies both as
defaults and there is nothing to do. Elsewhere the leaf is issued
from that CA out of band and named here — see docs/swarm/secrets.md.
Grafana exchanges its authorization code at
`''${url}/api/oidc/token` from inside its container. With the URL
null there is no endpoint to name.
'';
}
];
@ -536,152 +450,66 @@ in
"d ${deployCfg.grafana.socketDir} 0750 ${toString grafanaUid} ${toString nginxGid} - -"
];
# THE delivery unit — one route, in every deployment. The secret authelia
# minted arrives out of the swarm secret store, which the publisher on
# authelia's host wrote it into, and that is true whether authelia is a
# network away or in the container next door.
# The secret delivery. It runs on the HOST because that is the only place
# both container trees are addressable: they share this host's network
# namespace, which makes them feel co-located, but their filesystem roots
# are separate — Grafana cannot open a path inside authelia's tree
# however local the port looks.
#
# 🩸 A second unit here used to copy the plaintext out of authelia's host
# tree wherever the two were co-located, with the OIDC block gated on
# either route being available. The ruling that deleted it: the store
# exists so a host holds ONE out-of-band secret — its client certificate —
# and reads everything else with it, so skipping the store when the
# producer is local buys a round trip and costs a second delivery path, a
# second way for the file to be wrong, and a gate whose false arm was a
# Grafana with no login. Recorded in docs/swarm/secrets.md.
#
# Shaped after ./glue-queue-agent-credential.nix, because it is a store
# reader and this is what the store's readers do: a cert login that fails
# LOUDLY, since every state it fails on is one a retry fixes, then a read
# that degrades QUIETLY, since no retry turns "no value there" into a value.
#
# ⚠️ An ABSENT secret is "not published yet", not a fault of this host's.
# The publisher runs on the authelia host and authelia mints on its first
# boot, so early in a swarm's life there is legitimately nothing to read.
# Nothing here writes a stand-in: there is no such thing as a locally valid
# OIDC client secret, and a placeholder would turn a Grafana that cannot
# log anyone in into one whose token exchange is refused.
#
# ⇒ So the absence surfaces at Grafana rather than here, and this unit's job
# is to leave the journal line that says which of the three it was: the
# secret not arriving is a Grafana nobody can log into, and a named cause is
# the only thing separating that from a mystery.
systemd.services.swarm-bao-grafana-oidc = {
description = "fetch Grafana's OIDC client secret from the swarm secret store";
# Every one of these names a unit that exists only where the store runs.
# `Requires=` on an absent unit fails the job outright, so the ordering
# is conditional even though the read is not: off-host there is nothing
# local to wait for, and the timeout below bounds the attempt instead.
after = lib.optionals baoDeploy.enable [
"swarm-bao-pki.service"
"container@${baoCfg.machine}.service"
];
wants = lib.optionals baoDeploy.enable [ "container@${baoCfg.machine}.service" ];
requires = lib.optionals baoDeploy.enable [ "swarm-bao-pki.service" ];
# ⚠️ Deliberately a copy and not a `bindMounts` entry. nixos-container
# refuses to start when a bind source is missing, and this secret does
# not exist until authelia's first boot has minted it — so binding it
# would make Grafana wait on a file that waits on a container that starts
# after it.
systemd.services.swarm-grafana-oidc-secret = lib.mkIf ssoLocal {
description = "deliver Grafana's OIDC client secret from authelia";
after = [ "container@${autheliaCfg.machine}.service" ];
requires = [ "container@${autheliaCfg.machine}.service" ];
before = [ "container@${cfg.machine}.service" ];
wantedBy = [
"multi-user.target"
"container@${cfg.machine}.service"
];
path = [
baoDeploy.package
pkgs.coreutils
];
# Sized for the race this loses, not for an unseal: `swarm-bao` comes up
# seconds before this unit asks, and the cert-auth role it logs in
# against is written seconds after, so a few short attempts cover it. An
# hours-long window would be a bet on a sealed store, and the degrade
# below is already correct for that.
#
# `StartLimit*` are `[Unit]` settings, so they go here and not in
# `serviceConfig` — systemd ignores them under `[Service]`. The window
# has to exceed `RestartSec × burst`.
startLimitBurst = 4;
startLimitIntervalSec = 300;
wantedBy = [ "container@${cfg.machine}.service" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
SyslogIdentifier = "swarm-bao-grafana-oidc";
# What actually bounds the read below. Stated here rather than left to
# systemd's default, so the number a boot waits on is in the file that
# waits.
TimeoutStartSec = 30;
Restart = "on-failure";
RestartSec = 15;
};
environment = {
BAO_ADDR = "https://${baoCfg.domain}:${toString baoCfg.port}";
BAO_CLIENT_CERT = baoDeploy.clientCertFile;
BAO_CLIENT_KEY = baoDeploy.clientKeyFile;
}
# Absent means the system trust store, which is what a deployment with a
# real CA wants and what a self-signed one must not be left with.
// lib.optionalAttrs (baoDeploy.serverCaFile != null) {
BAO_CACERT = baoDeploy.serverCaFile;
SyslogIdentifier = "swarm-grafana-oidc-secret";
# ⚠️ Longer than the wait below, and that is the whole point:
# `DefaultTimeoutStartSec` is 90s, so a 120s bounded wait is killed
# by systemd at 90 — before it can emit the error naming the file it
# waited for. The timeout has to outlive the thing it is timing.
TimeoutStartSec = "180s";
};
path = [ pkgs.coreutils ];
script = ''
set -euo pipefail
# `bao`'s own message is the only thing separating a missing value from
# a refused identity from an unreachable host. This unit's degraded
# mode is correct for all three, so it reports which one rather than
# asserting all three in a sentence of ours.
err="$(mktemp)"
trap 'rm -f "$err"' EXIT
src=${lib.escapeShellArg "${deployCfg.authelia.hostClientSecretDir}/${cfg.oidc.clientId}.secret"}
dst=${lib.escapeShellArg "/var/lib/nixos-containers/${cfg.machine}${secretPath}"}
# Cert auth is a login, not a transport setting. The `BAO_CLIENT_*`
# variables above only decide which certificate the TLS handshake
# presents; without a token `bao` asks its token helper instead, and
# that is a `sh` this unit's `path` does not carry. `-token-only`
# answers on stdout and skips the helper on both sides.
if ! BAO_TOKEN="$(bao login -method=cert -token-only 2>"$err")"; then
echo "could not log in to swarm-bao with this host's certificate; leaving Grafana's OIDC client secret as it is." >&2
if [ -s "$err" ]; then
cat "$err" >&2
else
echo "bao failed without writing a diagnostic." >&2
fi
# authelia's container is up, but its first-boot generator may still
# be minting. Bounded wait, then fail: a silent skip here produces a
# Grafana whose only login path dead-ends.
deadline=$(( SECONDS + 120 ))
while [ ! -s "$src" ]; do
if [ "$SECONDS" -ge "$deadline" ]; then
echo "authelia has not minted $src after 120s" >&2
exit 1
fi
export BAO_TOKEN
sleep 2
done
if ! secret="$(bao kv get -field=value ${lib.escapeShellArg storeSecretPath} 2>"$err")"; then
echo "swarm-bao did not return ${storeSecretPath}; Grafana has no OIDC client secret yet." >&2
if [ -s "$err" ]; then
cat "$err" >&2
else
echo "bao failed without writing a diagnostic." >&2
fi
exit 0
fi
if [ -z "$secret" ]; then
echo "swarm-bao returned an empty ${storeSecretPath}; leaving the file as it is." >&2
exit 0
fi
# Written with a shell builtin, never handed to a program: `printf` is
# bash's own, so the plaintext never becomes an argument in /proc the
# way `install <<<"$secret"` or an `echo` from `path` would.
#
# Owned by Grafana's own uid, unlike the matrix sibling which lands
# root-owned: tuwunel's secret is read by `LoadCredential` as root
# before the sandbox exists, whereas Grafana expands `$__file{}`
# itself, as itself, while parsing its config. This container sets no
# `privateUsers`, so the host uid is the container uid, and both sides
# take it from the same static NixOS id.
# itself, as itself, while parsing its config. These containers set
# no `privateUsers`, so the host uid is the container uid, and both
# sides take it from the same static NixOS id.
#
# Group is root, not grafana, and that is forced rather than chosen:
# `ids.uids.grafana` is a static id but there is no `ids.gids.grafana`
# — the group's gid is allocated at activation inside the container, so
# the host cannot know it at eval time. Harmless here because 0400
# grants the group nothing; if this mode ever widens, the gid has to be
# discovered at runtime rather than assumed.
install -d -m 0755 ${lib.escapeShellArg hostSecretDir}
umask 077
printf '%s\n' "$secret" > ${lib.escapeShellArg hostSecretPath}
chown ${toString config.ids.uids.grafana}:0 ${lib.escapeShellArg hostSecretPath}
chmod 0400 ${lib.escapeShellArg hostSecretPath}
# — the group's gid is allocated at activation inside the container,
# so the host cannot know it at eval time. Harmless here because 0400
# grants the group nothing; if this mode ever widens, the gid has to
# be discovered at runtime rather than assumed.
install -D -m 0400 -o ${toString config.ids.uids.grafana} -g 0 "$src" "$dst"
'';
};
@ -880,21 +708,14 @@ in
# public gateway, so SSO is the only way in — not merely the
# preferred one.
#
# Not conditional on anything, and the block below is not
# either, which is what keeps the two from ever disagreeing.
# Whether a password box sits on a public login page cannot
# depend on which host happens to run authelia — and it used to,
# in a module where the OIDC block was gated and this line was
# not.
# Deliberately NOT `ssoLocal`: whether a password box sits on a
# public login page cannot depend on which host happens to run
# authelia. The OIDC block below is still gated on locality;
# making that follow the same swarm-wide question is a larger
# change tracked on its own.
auth.disable_login_form = true;
# Emitted in every deployment, because SSO is a requirement of
# running this service rather than a feature of some topologies:
# the assertions above refuse to build a Grafana that lacks an
# IdP to point at or the identity to fetch its secret with. A
# `lib.optionalAttrs` here would be the silent half of that pair,
# dropping the only login this container has whenever a value
# went null.
}
// lib.optionalAttrs ssoLocal {
"auth.generic_oauth" = {
enabled = true;
name = "HyperHive";
@ -905,9 +726,6 @@ in
# `database.password`, `security.admin_password` and
# datasource `secureJsonData`), so nothing but this comment
# stands between a literal and the store.
#
# `swarm-bao-grafana-oidc.service` above is what writes this
# path, on every host that runs Grafana.
client_secret = "$__file{${secretPath}}";
scopes = "openid profile email groups";
auth_url = "${autheliaUrl}/api/oidc/authorization";

58
nix/host-modules/swarm-secret-publisher.nix
View file

@ -1,13 +1,5 @@
# The unit that copies authelia's minted OIDC client secrets into the swarm's
# secret store, so whoever needs one can read it there: a hive its agents'
# credential, a swarm service its own.
#
# ⚠️ "Whoever", including a reader on THIS host. A swarm service's secret goes
# into the store even when the service runs beside authelia, because its
# reader fetches it from the store in every deployment — ./swarm-grafana.nix
# states the ruling that made that the only route. Publishing "only when the
# reader is elsewhere" would be a second shape of this unit, gated on a fact
# about another host, to save a round trip on the one host that can afford it.
# secret store, so a hive that does not host authelia can read its own.
#
# ⚠️ IT RUNS WHERE AUTHELIA DOES, and that is the whole reason it exists as a
# separate thing. `deploy.authelia.hostClientSecretDir`'s own description says
@ -55,18 +47,6 @@ let
# ./swarm-authelia.nix composes it, from the same two read-only options, so a
# rename there cannot leave this spelling behind.
agentClientId = hive: "${autheliaCfg.hiveClientPrefix}${hive}${autheliaCfg.agentClientSuffix}";
# The swarm's own services, as opposed to its hives. One client for the whole
# swarm rather than one per hive, so one value in the store rather than a copy
# each: `swarm/services/<id>/oidc/client`, under the `services` kind
# `swarm-secret-client`'s `path::Kind` declares.
#
# The ids come from `swarm.*`, which is identical on every host — that is what
# lets this host name a service's client while running none of them, and it is
# the same read the service's own module registers the client with. A swarm
# that runs no Grafana mints no secret for it, so its entry skips below rather
# than needing a condition here.
serviceClientIds = [ hyperhiveCfg.swarm.grafana.oidc.clientId ];
in
{
options.services.hyperhive.deploy.swarm-secret-publisher = {
@ -76,9 +56,7 @@ in
defaultText = lib.literalExpression "deploy.authelia.enable";
description = ''
Publish the OIDC client secrets this host mints into the swarm's
secret store, so a hive that does not run authelia can read its
agents' credential and a swarm service can read its own — from
wherever it runs, this host included.
secret store, so hives that do not run authelia can read their own.
Defaults to whether this host mints them, which is the only half of
the question that is a property of *this* host.
@ -90,11 +68,10 @@ in
publishing nothing. Whether the wiring is complete is the client
identity's job (see `baoClientCertFile`), not this option's.
Turning it off leaves every hive but this one without its agents'
credential, and the swarm's Grafana without any login at all — its
secret has exactly one route and this is the producer's end of it. So
the honest reason to set it false is a deployment delivering those
secrets by some other mechanism it owns.
Turning it off leaves every non-co-located hive without a delivery
path, which is the state this exists to end — so the honest reason
to set it false is a deployment delivering those secrets by some
other mechanism it owns.
'';
};
@ -200,29 +177,6 @@ in
fi
'') hiveNames}
${lib.concatMapStringsSep "\n" (id: ''
src=${lib.escapeShellArg "${deployCfg.authelia.hostClientSecretDir}/${id}.secret"}
if [ -s "$src" ]; then
# `value=@$src` for the same reason as the hive loop above: bao
# opens the file itself, so the plaintext is never an argument of
# this process.
#
# No `client_id` field beside it, unlike a hive's credential: that
# one is derived per hive and has to be reconstructable from the
# store alone, whereas a service's client id is the swarm-wide
# option both ends already read.
bao kv put ${lib.escapeShellArg "secret/swarm/services/${id}/oidc/client"} \
value=@"$src"
published=$((published + 1))
else
# Not an error, and the ordinary state of a swarm that runs this
# service nowhere: nothing registered the client, so authelia minted
# nothing to publish.
echo "no minted secret at $src yet; the path unit will re-run this" >&2
skipped=$((skipped + 1))
fi
'') serviceClientIds}
echo "published $published client secret(s), skipped $skipped"
'';
};

196
nix/module-eval.nix
View file

@ -223,73 +223,6 @@ let
swarm.grafana.package = pkgs.emptyDirectory;
};
# The metrics UI beside the IdP. It reads its secret out of the store like
# every other Grafana host, so it needs a store identity like every other
# Grafana host — the cert pair here is not scenery, it is the arm that would
# have caught the deleted co-located copy unit coming back.
grafanaWithAuthelia = hive {
deploy.grafana.enable = true;
deploy.grafana.plugins = [ ];
deploy.grafana.package = pkgs.emptyDirectory;
deploy.authelia.enable = true;
deploy.bao.clientCertFile = "/etc/pki/bao-client.pem";
deploy.bao.clientKeyFile = "/etc/pki/bao-client-key.pem";
};
# The same UI with the IdP on ANOTHER host and a store leaf placed by hand.
# Knowing an IdP is not running one: `swarm.authelia.url` is what says this
# swarm has SSO, and nothing about this host does. Identical to the fixture
# above in everything the delivery path reads, which is the point.
grafanaRemoteAuthelia = hive {
deploy.grafana.enable = true;
deploy.grafana.plugins = [ ];
deploy.grafana.package = pkgs.emptyDirectory;
swarm.authelia.url = "https://auth.example.invalid";
deploy.bao.clientCertFile = "/etc/pki/bao-client.pem";
deploy.bao.clientKeyFile = "/etc/pki/bao-client-key.pem";
};
# A Grafana host holding no store identity. This used to be the shape the
# module went QUIET on — no OIDC block, a warning, and a container whose
# login form is off regardless, so no way in and nothing failed. It is kept
# rather than deleted because the shape is still reachable by an operator;
# what changed is the deliverable, from a warning nothing reads back to a
# refusal naming the two options to set. Only the identity is missing, so an
# arm below can name which refusal fired.
grafanaNoIdentity = hive {
deploy.grafana.enable = true;
deploy.grafana.plugins = [ ];
deploy.grafana.package = pkgs.emptyDirectory;
swarm.authelia.url = "https://auth.example.invalid";
};
# The mirror image: the identity is placed, and the swarm names no IdP. The
# other half of "SSO must always be configured", and isolated the same way —
# exactly one thing wrong, so the arm reads one refusal.
grafanaNoSso = hive {
deploy.grafana.enable = true;
deploy.grafana.plugins = [ ];
deploy.grafana.package = pkgs.emptyDirectory;
deploy.bao.clientCertFile = "/etc/pki/bao-client.pem";
deploy.bao.clientKeyFile = "/etc/pki/bao-client-key.pem";
};
# Did ./host-modules/swarm-grafana.nix refuse this host, and for which of its
# two reasons. An assertion is a config VALUE until something forces it —
# `.config` never throws — so a fixture in a state the module refuses is
# evaluable and the refusal is readable as data. That is what lets a case
# check that a misconfiguration is REPORTED, rather than only that it is not
# silently accepted.
#
# Matched on the option name the message names, not on its prose, so the
# wording stays rewordable: the option name is the part an operator has to
# act on, and a message that stopped naming it would be the actual defect.
grafanaRefusedFor =
m: option:
lib.any (
a:
!a.assertion
&& lib.hasInfix "services.hyperhive.deploy.grafana.enable requires" a.message
&& lib.hasInfix option a.message
) m.assertions;
# The first slice to leave options on BOTH sides of the split, so the
# fixture sets all three of them through the paths an existing config uses:
# the two movers via their rename entries, `tokenEndpoint` via the path it
@ -903,122 +836,6 @@ let
ok =
grafanaOldPath.containers.swarm-grafana.config.services.grafana.settings.auth.disable_login_form;
}
{
# The absence class this whole file is for, and the reported defect in one
# arm: the OIDC block hung off "authelia is on this host", so the split
# deployment got a Grafana with no SSO settings and no login form — no way
# in at all. The block is emitted in every deployment now, so the negative
# arm is not "no block elsewhere" but "the two do not name the same IdP":
# each host's block has to point at the URL the SWARM names, and a block
# built from `deploy.authelia` rather than `swarm.authelia.url` would pass
# a presence check on both fixtures while sending one of them nowhere.
name = "grafana's OIDC block names the swarm's IdP, wherever that IdP runs";
ok =
let
oauth = m: m.containers.swarm-grafana.config.services.grafana.settings."auth.generic_oauth";
remote = oauth grafanaRemoteAuthelia;
local = oauth grafanaWithAuthelia;
in
remote.enabled
&& lib.hasInfix "https://auth.example.invalid/api/oidc/token" remote.token_url
&& local.enabled
&& lib.hasInfix "https://auth.t.local/api/oidc/token" local.token_url
&& !(lib.hasInfix "auth.example.invalid" local.token_url);
}
{
# 🩸 The arm that guards the ruling this slice landed under. There is ONE
# delivery route: the store reader, on every host that runs Grafana. The
# negative names the deleted unit rather than a generic absence, because
# the way this regresses is someone re-adding the co-located copy as an
# optimisation — a second writer of one path, and a second shape of "the
# secret is wrong" to debug.
name = "grafana's OIDC secret has exactly one delivery unit, the store reader, in both topologies";
ok =
let
local = grafanaWithAuthelia.systemd.services;
remote = grafanaRemoteAuthelia.systemd.services;
in
local ? swarm-bao-grafana-oidc
&& remote ? swarm-bao-grafana-oidc
&& !(local ? swarm-grafana-oidc-secret)
&& !(remote ? swarm-grafana-oidc-secret);
}
{
# What the deleted warning became. The shape is unchanged — a Grafana host
# holding no store leaf — but silence there is a container nobody can log
# into for a reason no log names, and a warning is read back by nothing.
# The second arm is what makes this a refusal about the IDENTITY: this
# fixture names an IdP, so a message about `swarm.authelia.url` here would
# mean the two assertions had been collapsed into one conjunction.
name = "a grafana host with no store identity is refused, naming the options to set";
ok =
grafanaRefusedFor grafanaNoIdentity "deploy.bao.clientCertFile"
&& grafanaRefusedFor grafanaNoIdentity "deploy.bao.clientKeyFile"
&& !(grafanaRefusedFor grafanaNoIdentity "swarm.authelia.url");
}
{
# "SSO must always be configured", as an eval-time refusal rather than a
# gate. A null URL used to drop the OIDC block silently, and
# `disable_login_form` is unconditional a hundred lines below it, so that
# combination produced a Grafana with no SSO and no password box — an
# outage whose cause is a boolean that evaluated to false at build time
# and left no trace. Same isolation as the arm above, mirrored.
name = "a grafana host in a swarm with no IdP is refused, naming swarm.authelia.url";
ok =
grafanaRefusedFor grafanaNoSso "services.hyperhive.swarm.authelia.url"
&& !(grafanaRefusedFor grafanaNoSso "deploy.bao.clientCertFile");
}
{
# Without this the two arms above prove nothing: a refusal that fires on
# every host is not a check, and both of these are hosts a swarm is
# expected to have. Read through the same helper, so a message that
# stopped naming its option would fail the arms above rather than pass
# this one by accident.
name = "neither grafana refusal fires on a correctly configured host, co-located or not";
ok =
!(grafanaRefusedFor grafanaWithAuthelia "services.hyperhive.swarm.authelia.url")
&& !(grafanaRefusedFor grafanaWithAuthelia "deploy.bao.clientCertFile")
&& !(grafanaRefusedFor grafanaRemoteAuthelia "services.hyperhive.swarm.authelia.url")
&& !(grafanaRefusedFor grafanaRemoteAuthelia "deploy.bao.clientCertFile");
}
{
# Same 403-not-a-miss reason as the matrix and queue arms below: the
# reader's grant covers the `services` prefix, so a path outside it is
# refused rather than empty, however correct it reads. The negative arm is
# the rename this is exposed to — a secret filed under the hive that runs
# the service instead of under the service itself.
name = "grafana's OIDC secret is read from the prefix the publisher writes";
ok =
let
s = grafanaRemoteAuthelia.systemd.services.swarm-bao-grafana-oidc.script;
in
lib.hasInfix "secret/swarm/services/swarm-grafana/oidc/client" s
&& !(lib.hasInfix "secret/swarm/hives/" s);
}
{
# Both ends of a wire nothing at eval time carries end to end: the
# publisher on authelia's host writes the path the reader on Grafana's host
# reads, and the two files agree only because both compose it from the same
# swarm-wide client id.
name = "the publisher writes the swarm service path grafana reads";
ok = lib.hasInfix "secret/swarm/services/swarm-grafana/oidc/client" (
secretPublisherHere.systemd.services.swarm-secret-publish.script
);
}
{
# Registering the client cannot live where the rest of grafana's module
# lives: that block is gated on this host RUNNING grafana, so on the split
# deployment nothing registered the client, authelia minted no secret, and
# every layer below had nothing to carry. The second arm is the control —
# a host with no IdP registers nothing.
name = "the swarm's grafana client is registered wherever authelia runs";
ok =
let
clients = m: map (c: c.id) m.services.hyperhive.swarm.authelia.oidc.clients;
in
lib.elem "swarm-grafana" (clients secretPublisherHere)
&& !(lib.elem "swarm-grafana" (clients grafanaRemoteAuthelia));
}
{
# Reads the daemon's rendered unit, not the options: the queue address
# arrives as an env var whose whole attrset is guarded on `natsUrl`, and
@ -1117,18 +934,17 @@ let
!(baoGrantHere.containers.swarm-bao.config.systemd.services ? swarm-bao-secret-publisher-policy);
}
{
# The whole point of a second principal. The two prefixes it publishes to
# and not `swarm/`, so it cannot touch an agent's credentials; and no
# `read`, so a unit whose job is copying a file cannot recover what is
# already there. Pinned as the full capability list per prefix, because an
# added capability is exactly what a presence check misses.
name = "the publisher's grant is write-only and reaches the hive and service prefixes alone";
# The whole point of a second principal. `hives/` and not `swarm/`, so it
# cannot touch an agent's or a service's credentials; and no `read`, so a
# unit whose job is copying a file cannot recover what is already there.
# Pinned as the full capability list, because an added capability is
# exactly what a presence check misses.
name = "the publisher's grant is write-only and reaches the hive prefix alone";
ok =
let
s = baoGrantHere.systemd.services.swarm-bao-secret-publisher-policy.script;
in
lib.hasInfix "path \"secret/data/swarm/hives/*\" {\n capabilities = [\"create\", \"update\"]" s
&& lib.hasInfix "path \"secret/data/swarm/services/*\" {\n capabilities = [\"create\", \"update\"]" s
&& !(lib.hasInfix "secret/data/swarm/agents" s)
&& !(lib.hasInfix "secret/data/swarm/*" s)
&& !(lib.hasInfix "sys/policies/acl" s);

52
swarm-secret-client/src/policy.rs
View file

@ -5,8 +5,8 @@
//! two have to agree on the same path or a delivery fails with a 403 that names
//! nothing.
//!
//! The document has one stanza per kind a hive reads, and they are not all
//! scoped alike — which is the point rather than an inconsistency:
//! The document has one stanza per kind a hive reads, and the two are scoped
//! differently on purpose:
//!
//! ⚠️ The **agent** stanza grants read on *every* agent's credentials rather
//! than on the ones that hive hosts. That is a decision, not an oversight: an
@ -16,14 +16,9 @@
//! narrow one that only looks narrow. The narrower shapes, and what they would
//! cost, are in `docs/trust-boundary/security.md`.
//!
//! ⚠️ The **service** stanza is wide for the same shape of reason: a swarm
//! service's client is registered once per swarm, so its path names the service
//! and never the host, and which hive runs a service is a `deploy.*` fact with
//! no swarm-wide spelling to scope against. Cost: the same doc.
//!
//! The **hive** stanza has no such problem and is therefore narrow: that path
//! names its principal, so scoping it to the reader's own name costs nothing
//! and drifts nowhere. Do not widen it to match its neighbours — the asymmetry
//! and drifts nowhere. Do not widen it to match its neighbour — the asymmetry
//! is the point.
//!
//! Rendering stays separate from writing so the text can be asserted with no
@ -57,8 +52,8 @@ fn read_stanza(path: &str) -> String {
format!("path \"{path}\" {{\n capabilities = [\"read\"]\n}}\n")
}
/// Render `hive`'s policy document: read on every agent's credentials, on this
/// hive's own, and on the swarm services'.
/// Render `hive`'s policy document: read on every agent's credentials, and on
/// this hive's own.
///
/// The name is the only input, and it is deploy-time — so the document is
/// still a deploy-time object rather than derived state with a re-emission to
@ -66,15 +61,9 @@ fn read_stanza(path: &str) -> String {
///
/// Read-only: the controller mints these and never reads one back.
///
/// ⚠️ The controller kind is deliberately absent: a hive has no business
/// reading the credentials of the thing that provisions it. Adding it is a
/// boundary decision, not a consequence of the namespace growing.
///
/// The **service** kind is granted, and that was such a decision rather than a
/// consequence: a service whose identity provider is on another host reads its
/// own OIDC client secret with the certificate of the hive it runs on, that
/// being the only identity such a host has — so every hive can read every
/// service's. Bought and paid for in `docs/trust-boundary/security.md`.
/// ⚠️ The service and controller kinds are deliberately absent: a hive has no
/// business reading a service's or the controller's credentials. Adding either
/// is a boundary decision, not a consequence of the namespace growing.
///
/// The hive's *own* kind is granted, and that is the decision the agent-only
/// version of this grant said had to be made rather than assumed: a hive holds
@ -96,11 +85,7 @@ pub fn render(hive: &str) -> Result<String, Error> {
"{MOUNT}/data/{ROOT}/{}/{hive}/*",
<&str>::from(Kind::Hive)
));
let services = read_stanza(&format!(
"{MOUNT}/data/{ROOT}/{}/*",
<&str>::from(Kind::Service)
));
Ok(format!("{agents}{own}{services}"))
Ok(format!("{agents}{own}"))
}
#[cfg(test)]
@ -108,26 +93,11 @@ mod tests {
use super::*;
#[test]
fn the_document_grants_two_whole_prefixes_and_this_hive_alone() {
fn the_document_grants_the_whole_agent_prefix_and_this_hive_alone() {
assert_eq!(
render("pr1ma").expect("a plain name is legal"),
"path \"secret/data/swarm/agents/*\" {\n capabilities = [\"read\"]\n}\n\
path \"secret/data/swarm/hives/pr1ma/*\" {\n capabilities = [\"read\"]\n}\n\
path \"secret/data/swarm/services/*\" {\n capabilities = [\"read\"]\n}\n"
);
}
#[test]
fn the_service_stanza_covers_a_service_this_hive_was_never_named_beside() {
// The property the swarm-grafana delivery depends on: the host running a
// swarm service reads that service's client secret with its own hive
// certificate, and the path names the service rather than the host. A
// stanza narrowed to the reader's name would 403 every such read.
let p = render("pr1ma").expect("legal");
assert!(p.contains("path \"secret/data/swarm/services/*\""));
assert!(
!p.contains("services/pr1ma"),
"the service stanza is not scoped to the reader"
path \"secret/data/swarm/hives/pr1ma/*\" {\n capabilities = [\"read\"]\n}\n"
);
}