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Ben Duncan
b6d01370dd
* fix: render northstar's recursion allowlist so a node is not an open resolver northstar.toml is written with allow_recursion = false and an allow_recursion_from list built from cluster membership, so a freshly formed node serves recursion to the cluster and refuses it to the internet. The list is the node's own bind and advertise addresses plus every peer's host, with any port stripped. Both local addresses matter: a node's resolv.conf points at its own advertised address, so the query arrives from that public IP over lo rather than from 127.0.0.1, and an allowlist of loopback alone would stop every node resolving internal names. Guests are covered without appearing in the list. vpcd's per-tap DNS shim relays guest queries to a node's :5300 from a node address, so trusting the nodes trusts every guest behind them and no guest CIDR is needed. The template comment carries the caveats for allow_recursion = true, since the cost of setting it is remote from the setting: an open resolver is found by scanners within hours and gets the node's whole address range blocklisted, which is an outage for every tenant on it. The list is rendered at formation, so a node added later is not in its peers' files. Regenerating it live from membership, as the daemon already does for peers.nft, is follow-on work tracked on mulga-t3mub. * chore: pin northstar to the recursion ACL and atomic zone reload The recursion allowlist this branch renders is enforced by northstar's RecursionPolicy, which lands in dev at a0e741e. CI resolves northstar from go.mod rather than the workspace, so the build failed on NewRecursionPolicy being undefined until this pin moved. The AWS SDK bumps come with it.