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fix(#3391): give the swarm controller hive-CA trust

Browse source 
The controller's forge client speaks TLS to `https://<forge domain>`,
which the gateway serves with a leaf signed by the hive CA. That CA is
generated at runtime, so nothing build-time can name it and it is not in
the system store -- and `reqwest`/`rustls` resolves roots through
`rustls-native-certs`, whose `SSL_CERT_FILE` *replaces* the store rather
than adding to it. With no bundle wired, every forge call failed
`invalid peer certificate: UnknownIssuer` and agent creation died at its
first step.

`lib/hive-ca-trust.nix` already solved this, but only for containers: it
sources the CA through `/run/hive-ca/trust-bundle.pem`, a bind mount that
does not exist on the host. `hostUnit` makes it read the host copy and
wait on `hive-tls-ca.service` itself -- one flag driving both, because a
host source without that ordering is a race.

`enable` is the other half, and it is the sharp edge: a container caller
imports this into the container's module set, so it disappears with the
container. A host caller imports it at the host's top level, where
`imports` is unconditional -- without the flag, a hive with the
controller turned off would get a bundle oneshot and a `swarm-controller`
service conjured by `genAttrs`, holding an `SSL_CERT_FILE` and no
`ExecStart`.
This commit is contained in:
atlas 2026-08-18 17:38:26 +02:00
commit d14963ad2b
2 changed files with 55 additions and 2 deletions
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27
nix/host-modules/lib/hive-ca-trust.nix
View file

@ -83,25 +83,48 @@ in
#
# Returns a module, not bare services: a caller already writing
# `systemd.services.<consumer>` cannot also write `systemd.services`.
#
# The two host-consumer flags are documented at their use sites below.
trustBundle =
{
name,
consumers,
pkgs,
# A HOST systemd service rather than something inside a container.
# `caContainerPath` is a bind mount that only exists in a container, so
# a host consumer reads the host copy — which means waiting for the
# unit that writes it. In a container that wait is the container's own
# (`containerOrdering`); here nothing carries it. One flag, because a
# host source without the ordering is a race.
hostUnit ? false,
# Whether the consumer exists at all. A container caller imports this
# into the CONTAINER's module set, so it vanishes with the container. A
# host caller imports it at the host's top level, where `imports` is
# unconditional — without this, a hive with the consumer off still gets
# a bundle oneshot *and* a `systemd.services.<consumer>` conjured by
# `genAttrs`, holding an `SSL_CERT_FILE` and no `ExecStart`.
enable ? true,
}:
let
dir = "/run/${name}-ca";
bundlePath = "${dir}/trust-bundle.pem";
unit = "${name}-ca-bundle";
source = if hostUnit then caHostPath else caContainerPath;
in
{
_file = "hive-ca-trust.nix#trustBundle:${name}";
config.systemd.services = lib.optionalAttrs useSelfSigned (
config.systemd.services = lib.optionalAttrs (useSelfSigned && enable) (
{
${unit} = {
description = "assemble ${name} TLS trust bundle (system CAs + hive CA)";
wantedBy = [ "multi-user.target" ];
before = map (c: "${c}.service") consumers;
# Only for a host consumer: the CA file is written at runtime by
# `hive-tls-ca.service`, and reading it directly means waiting
# for it. A container consumer reads a bind mount instead, and
# its `container@` unit carries the equivalent wait.
after = lib.optionals hostUnit [ "hive-tls-ca.service" ];
requires = lib.optionals hostUnit [ "hive-tls-ca.service" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
@ -115,7 +138,7 @@ in
set -euo pipefail
install -d -m 0755 ${dir}
tmp=${bundlePath}.tmp
cat /etc/ssl/certs/ca-certificates.crt ${caContainerPath} > "$tmp"
cat /etc/ssl/certs/ca-certificates.crt ${source} > "$tmp"
# `cat` of an empty or missing-but-mounted source exits 0, so the
# result has to be inspected rather than the command trusted.
if ! grep -q 'BEGIN CERTIFICATE' "$tmp"; then