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agents: re-pull the agent's own bao mTLS leaf on a timer

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swarm-controller re-issues an agent's store leaf at half its validity, but
the running container kept presenting the copy its hive delivered at
start, so a re-issued leaf reached the agent only on its next restart.

hive-agent-bao-identity now seeds a live copy of the pair in its own
runtime directory from the delivered credentials, and re-runs every 10
minutes: it logs in with the live leaf, reads its own
swarm/agents/<agent>/bao-mtls (a read render_agent already grants), and
when the leaf changed, logs in with the new pair and swaps it in only if
the store accepts it.

Every unit in the container that logs in to the store presents the live
pair: hive-agent (queue-identity.nix), hive-matrix-daemon,
hive-subagent-daemon, hive-agent-forge-token, hive-agent-forge-accounts
and hive-agent-github-token. They keep loading the server CA as a
credential. The long-running daemons are ordered after the refresher so
the live pair exists when they start.

It renews only while the held leaf is still valid: the login that reads
the new leaf is made with the current one.

Refs #5017
This commit is contained in:
atlas 2026-10-11 03:05:59 +02:00 • committed by mara
commit c6717bccb0
17 changed files with 308 additions and 166 deletions
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24
nix/agent-modules/queue-identity.nix
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@ -18,7 +18,7 @@
# before its first queue connection and again on every reconnect attempt
# (`hive-agent`'s `swarm_queue`), so a re-minted secret is picked up without a
# restart. What this module hands the harness is the store's address and the
# paths of its certificate.
# paths of the live certificate pair ./bao.nix keeps.
#
# ⛔ The store certificate is for reaching the store and nothing else. It is
# never presented to the queue: what goes to the queue is the secret read
@ -37,11 +37,9 @@ let
# role from it.
agentName = config.services.hyperhive.agent.user.name;
# The same three ids ./bao.nix loads, because there is one store identity
# per agent; the ids are `hive_c0re::lifecycle::agent_identity`'s and a
# rename is a rename there too.
certCredential = "hive-agent-bao-cert";
keyCredential = "hive-agent-bao-key";
# The server CA id ./bao.nix loads; the id is
# `hive_c0re::lifecycle::agent_identity`'s and a rename is a rename there
# too.
serverCaCredential = "hive-agent-bao-server-ca";
# The store's address is the whole switch, exactly as in ./bao.nix — and
@ -54,20 +52,18 @@ in
{
config = lib.mkIf configured {
systemd.services.hive-agent = {
# Bare ids, no paths: the terse `LoadCredential=` form that inherits a
# A bare id, no path: the terse `LoadCredential=` form that inherits a
# credential the service *manager* received, which is what the container
# manager passed in. ./bao.nix and ./queue.nix state the same shape.
serviceConfig.LoadCredential = [
certCredential
keyCredential
serverCaCredential
];
serviceConfig.LoadCredential = [ serverCaCredential ];
# The live certificate pair exists once ./bao.nix's unit has run.
after = [ "hive-agent-bao-identity.service" ];
# Paths and a name only. `%d` is this unit's own credentials directory.
environment = {
HIVE_AGENT_NAME = agentName;
BAO_ADDR = cfg.addr;
BAO_CLIENT_CERT = "%d/${certCredential}";
BAO_CLIENT_KEY = "%d/${keyCredential}";
BAO_CLIENT_CERT = cfg.clientCertFile;
BAO_CLIENT_KEY = cfg.clientKeyFile;
# Named even when no CA was delivered: a bare `LoadCredential=` is
# non-fatal when absent, and the harness treats a missing or empty file
# as "use the container's own trust store".