Files
internet_use_control/deploy/mosquitto/tls/README.md
Sam Rolfe 14b304e0b0 Phase 3: MQTT transport — retained config, status/telemetry, LWT presence, TLS/ACL design
- internal/mqtt: publish each device's desired state retained on
  restrict/<device>/config; subscribe to restrict/+/status and
  restrict/+/telemetry and write reports to SQLite; publish on every state
  change, republish on connect and every 15 minutes from SQLite, so the broker
  is repaired from the source of truth.
- store: presence (devices.online and last_seen, audited only on transitions),
  telemetry upsert per (device, day, app, domain) via migration 002, allow and
  block lists read into the config payload, device lookup by topic.
- config: MQTT settings. TLS plus per-device credentials are required; the
  pre-TLS shared broker needs an explicit CONTROL_MQTT_INSECURE escape hatch.
- web: republish config after lock, unlock, expiry, create and edit; broker card
  on the status partial.
- deploy/mosquitto: TLS listener, topic ACL, credential provisioning and a
  verifier that proves the policy on a throwaway broker. Not applied to the
  shared Mosquitto on .13 — that change needs Sam's approval.
- cmd/control: mqtt-clients prints the MQTT identity of every device.
- paho.mqtt.golang v1.5.1, which pulls golang.org/x/net and with it the
  golang.org/x/crypto bump to v0.42.0.

Verified on .13: retained config delivered to a fresh subscriber; a client
killed without DISCONNECT drove the broker's retained will and the service
flipped the device offline; telemetry landed in SQLite; make mqtt-verify passed
13/13; the service connected over TLS with credentials and a CA.

Co-Authored-By: Paperclip <noreply@paperclip.ing>
2026-10-13 14:37:43 +11:00

1.1 KiB

The lab CA and broker certificate

generate-tls.sh writes the certificate material here:

File Purpose Who gets it
ca.crt the lab CA certificate every device and the Control Service
ca.key the CA private key not a device; keep it off-device
server.crt the broker certificate the broker
server.key the broker private key the broker

Everything in this directory except this README is gitignored: certificates and keys are generated per host and never committed.

make mqtt-tls          # writes the four files (skips them if they exist)
make mqtt-tls-force    # use generate-tls.sh --force to replace them

The broker runs as user mosquitto (uid 1883) inside its container, and this directory is bind-mounted read-only, so the files are created mode 0644. That makes the private keys readable on .13 by any local user. It is the pragmatic choice for a LAN-only broker whose key must be readable by a container user that does not exist on the host. Replace it with a group-mapped setup if .13 ever gets untrusted local users.