P7 Private Network lane: product spec (Tailscale v1 + WireGuard self-hosted) + backlog tickets DC-140..DC-152

BACKLOG.md

@@ -433,3 +433,124 @@ Tickets DC-046 through DC-049 implement pluggable auth + email magic link. Sami
 - **prerequisite:** None. `caddy-upstream-watcher.js` already provides equivalent monitoring.
 - **result:** Shipped GLM-pending (Codex quota dead). Before/after on DNS2 (`journalctl -u caddy --since "5 minutes ago" | grep health_checker.active | wc -l`): **before = ~30 entries / 5min** (active probe every 10s, all failing); **after = 0 entries / 5min**. Live-verified: `caddy validate` succeeded (after removing `.bak` file that caused `ambiguous site definition`), Caddy reloaded via `caddy-apply`, route `arch.sami → 100.120.159.34:5000` still active in admin API (verified via `curl http://localhost:2019/config/apps/http/servers/srv0/routes` — `health_uri: None, health_interval: None` confirms the block is gone). Container `dashcaddy-api Up About an hour (healthy)` (no restart needed — only Caddyfile changed, not container). Live HTTP smoke all green: `https://status.sami=200`, `https://dashcaddy.net=200`, `https://ca.sami=200`, `https://status.sami/api/health=401` (auth-gated, expected). Watcher state for `100.120.159.34:5000`: `consecutiveFailures: 1905`, `lastError: "probe timeout"`, `status: down`, `dead: true` — correctly tracked in `/opt/dashcaddy/dashcaddy-api/data/caddy-upstreams.json`. Backup deleted (would have caused site-definition ambiguity on next Caddy reload). Git: change lives only in DNS2's `/etc/caddy/sites/arch.sami` (the `/etc/caddy` git repo `.gitignore` excludes `sites/` per design — only the main `Caddyfile` is tracked). The dashcaddy source repo (`/root/dashcaddy`) carries only this BACKLOG.md documentation update on branch `dc/DC-084-arch-sami-caddy-healthcheck-removal`.
 - **Tests:** No source code change; existing `__tests__/caddy-upstream-watcher.test.js` 26/26 pass (baseline preserved). 2465/2465 repo tests pass (4 pre-existing billing test suites fail with `Cannot find module pdfkit` — unrelated to this change).
+# P7 — Private Network lane (DC-140 … DC-152)
+
+> Spec: `specs/PRIVATE-NETWORK-SPEC.md`. Parent feature: DashCaddy Private Network
+> (Tailscale mode v1 + WireGuard self-hosted mode). Ordered by dependency, not by
+> value. All commits judge-gated (min B).
+
+### DC-140: Network provider abstraction (`src/network/`)
+- **status:** todo
+- **owner:** (fleet)
+- **details:** `provider.js` (contract + JSDoc), `registry.js` (active provider +
+  capabilities), `errors.js` (ProviderError with code/retryable). No feature code
+  may import a provider directly — registry only. Provider contract methods:
+  getStatus, listDevices, listPeople, createInvite, revokeInvite, blockPerson,
+  unblockPerson, removePerson, revokeDevice, syncAccess, whois, configureDns.
+  Tailscale provider wraps existing tailscale-coord.js + tailscale-manager.js.
+  Registry defaults to inactive until the wizard connects one. Tests: registry
+  resolution, capability flags, error mapping. Files: `src/network/*.js`,
+  `__tests__/network-registry.test.js`, `__tests__/network-provider-tailscale.test.js`.
+
+### DC-141: People store + routes (`routes/network-people.js`)
+- **status:** todo
+- **details:** people.json atomic store (invite-store pattern), CRUD routes under
+  `/api/v1/network/people`, admin-protection (`protectedAt`), last-admin guard
+  `assertNotLastAdmin()` exported for reuse. Sync endpoint merging provider users
+  into people. Tests: store CRUD, route contract, guard (cannot block/remove
+  last admin), sync merge idempotency.
+
+### DC-142: Tailscale invites (link-first) via provider
+- **status:** todo
+- **details:** POST/GET/DELETE `/api/v1/network/invites` calling provider
+  createInvite/revokeInvite. Tailscale: user-invites API, email optional —
+  inviteUrl is the artifact (share-text pre-formed sentence, copy button,
+  navigator.share, opt-in email checkbox; never log raw invite URLs to console).
+  Reuse DC-085 share pattern. Tests: route contract with mocked provider,
+  no-raw-token-in-logs assertion.
+
+### DC-143: Block / unblock / remove person + revoke device
+- **status:** todo
+- **details:** POST `/network/people/:id/block|unblock|remove`,
+  `/network/devices/:id/revoke`. Orchestrates: provider calls, session kill
+  (existing auth store), access-map purge/restore, audit log entries. Block must
+  be fully reversible (snapshots pre-block grants). Remove deletes devices +
+  person record. Tests: orchestration order (mocked provider), reversibility,
+  last-admin guard integration, audit entries written.
+
+### DC-143 cleanup note: access map module itself is DC-145.
+
+### DC-144: Groups (DashCaddy-side) + resources
+- **status:** todo
+- **details:** groups in people-store (array on person), group CRUD routes,
+  resource model (services registry projection + manual entries), per-resource
+  `sensitive` flag. No Tailscale-group mapping — ever (free plan caps 3; compiled
+  rules are per-user). Tests: group CRUD, resource projection, sensitive flag
+  validation.
+
+### DC-145: Access map store + grid API
+- **status:** todo
+- **details:** `network-access.json` grants store, bulk GET/PUT
+  `/network/access` (whole-grid save, atomic), effective-access computation
+  (group grants + person overrides), change events for compiler subscription.
+  This file is the single source of truth. Tests: store, effective access
+  resolution (group + override precedence), atomic whole-grid save.
+
+### DC-146: Technitium integration
+- **status:** todo
+- **details:** Technitium HTTP API client (credential via credential-manager),
+  per-resource/per-device record upserts (idempotent), split-DNS configure when
+  provider capability present, verify-by-resolve after write, wizard check step.
+  Tests: API client with mocked HTTP, idempotent upsert, failure paths.
+
+### DC-147: CA naming + name constraint + install page hardening
+- **status:** todo
+- issued from existing DashCA (routes/ca.js): operator-named root (setup-time,
+  rename = guided re-trust), critical nameConstraints (permitted DNS subtree =
+  private TLD), leaf regression tests (SAN + serverAuth EKU + ≤398d), branded
+  install page with per-OS steps incl. iOS enable-trust second step + fingerprint
+  + Android native-app caveat, encrypted root-key backup step (passphrase +
+  checksum). Tests: parse issued cert and assert constraint/SAN/EKU/validity;
+  install-page content checks.
+
+### DC-148: Tailscale ACL compiler + lockout guard
+- **status:** todo
+- **details:** access map → per-user HuJSON policy compiler. Hard rules:
+  last-active-admin must keep access to the DashCaddy host resource; host device
+  keeps egress; dry-run (ACL preview/test) before every push; last-known-good
+  policy retained for rollback; post-push hash stored, pre-push hash compare →
+  drift banner on mismatch. Provider.syncAccess(tailscale) uses this. Tests:
+  golden-policy cases, lockout adversarial cases (each rule), drift detection,
+  preview-failure refusal to push.
+
+### DC-149: WireGuard provider — hub management
+- **status:** todo
+- **details:** `providers/wireguard.js`: wg-quick iface `dcnet0`, address pool
+  10.d.c.0.0/16 stable assignment, keygen on hub, peer store, systemd unit
+  if missing. All execFile-mocked in tests. Tests: pool assignment stability,
+  peer add/remove, unit generation, error paths (missing wg binary).
+
+### DC-150: WireGuard invites (QR) + client config
+- **status:** todo
+- **details:** one-time token (7d TTL, single-use) → redemption page rendering
+  client config + QR (qrencode -t ansiutf8 → pre? no: PNG served) with Address,
+  DNS=Technitium hub IP, AllowedIPs = private zone only (split tunnel). Private
+  key shown once, never stored server-side. Tests: token lifecycle, config
+  template correctness (allowed-ips, DNS), single-use enforcement, expiry.
+
+### DC-151: WireGuard firewall matrix (nftables)
+- **status:** todo
+- **details:** per-resource nft sets (net_dc_res_<name>), peer IPs per grant,
+  transactional apply (build temp ruleset → `nft -c` → `nft -f` → verify →
+  rollback file), host admin ports restricted to admin peers. Tests: ruleset
+  golden text, transactional failure injection (nft -c fails → no apply),
+  verify-step failure, admin-port isolation.
+
+### DC-152: Setup wizard + status page
+- **status:** todo
+- **details:** mode pick → credentials/endpoint → private domain pick
+  (.internal default, home.arpa, custom+warning) → provider connect + sync →
+  Technitium check → CA naming (locked-in warning) → first admin person.
+  Status page: who's online, recent connections (provider status + DashCaddy
+  connection log). Reuse monitoring widget patterns. Tests: wizard step
+  contracts, status aggregation with mocked providers.