30 lines
1.4 KiB
Markdown
30 lines
1.4 KiB
Markdown
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# base
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Hardened baseline applied to every boma host. Built incrementally; the first concern
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implemented is the **host firewall** (`firewall` tag).
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## Firewall (nftables)
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Default-deny inbound + east-west allowlisting + permissive egress, per ADR-020. Rules
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are rendered from the shared `firewall_catalog` / `firewall_zones` (in `group_vars/all`)
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by the `resolve_firewall_rules` filter, written to `/etc/nftables.conf`, syntax-checked
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with `nft -c` at render time, and applied with an **auto-rollback safety net**
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(`systemd-run` arms a revert that a follow-up task cancels once connectivity is
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confirmed). The apply sequence lives in tasks rather than a handler so the confirm/cancel
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step is controllable.
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`/etc/nftables.d/*.nft` is `include`d by the ruleset — the extension hook the
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`docker_host` role uses for container forward/NAT rules.
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### Variables
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See `defaults/main.yml` (`base__firewall_*`). SSH is accepted only on
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`base__firewall_mgmt_interface` (default `wt0`, the NetBird overlay — ADR-016); set it to
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a reachable interface/source until NetBird is built. Set `base__firewall_apply: false` to
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render + validate without applying (used by Molecule).
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### Testing
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- `tests/test_firewall_rules.py` — pytest units for the resolver.
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- `make test ROLE=base` — Molecule renders + `nft -c` syntax-checks (never applies; it
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shares the host kernel). Enforcement + the apply/rollback path are verified at ADR-008
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Level 2 on staging VMs.
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