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Design connectivity in full: overlay, resolution, exposure, filtering, certificates

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Written as one document because the five are one design. They share inputs,
they must agree, and every one of them today is computed in a different place
by a different module from a different copy of the same facts.

The through-line is that none of the five can be answered by a machine alone,
so all five are decided centrally and delivered as `file` resources. That costs
no new host vocabulary and removes both remaining direct database connections
from nodes -- wireguard and traefik are the only two, and both are connectivity.

Three decisions fall out, all proposed:

0050 -- reachability is declared, not inferred from an address. The RFC1918
regex is wrong for carrier-grade NAT (100.64/10 tests as public, so an endpoint
is written to an address nothing can reach), wrong for IPv6, and wrong for a
routable address behind a closed firewall. The lab needing TEST-NET-3 to
satisfy the regex is the same bug from the other side. Also kills hub election
by address prefix, which fails silently and makes renumbering an outage.

0051 -- the enrolment token carries where the mesh is and how to recognise it.
Closes two circles with one mechanism: verifying the mesh needed the CA, and
obtaining the CA meant trusting whoever handed it over; and a node had to reach
the mesh before it could resolve any mesh name. An address plus a fingerprint,
carried out of band, resolves both -- and closes the CA question 0049 deferred.

0052 -- a filter rule names its source. `scope:` is declared in five manifests,
is part of no rule type, and is referenced by no code, so those manifests
appear to restrict ports and restrict nothing. Removed rather than implemented;
the general fix is refusing unknown keys, which the host already does and
manifests do not.

Also corrects two claims in 0049 asserting wireguard was already handled.
Research 006 says both modules still reach upward; neither is.
This commit is contained in:
jschoubben
2026-08-27 00:36:49 +02:00
parent 8d9282d86b
commit 4e80820e2f
7 changed files with 557 additions and 9 deletions
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03-DESIGN/01-to-be/06-the-control-plane.md
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@@ -49,7 +49,7 @@ Ten contexts and one interface, from the skeleton
| **record** | the event log every other context integrates through |
| **inventory** | nodes, modules, assignments, versions |
| **config** | settings, secrets, and deriving them onto nodes |
| **connectivity** | overlay, resolution, exposure, filtering, certificates — it *decides* routes; the proxy on a node applies them ([ADR 0049](../../02-DECISIONS/0049-a-route-is-a-grant.md)) |
| **connectivity** | overlay, resolution, exposure, filtering, certificates — **specified in full in [`08-connectivity.md`](08-connectivity.md)** |
| **provisioning** | resource grants between modules |
| **delivery** | source to artifact to node |
| **observability** | health, logs, metrics, alerts |