**Auto mutual pairing**
When Cell A imports Cell B's invite (POST /api/cells on A), A now
immediately pushes its own invite to Cell B over the LAN (using the
endpoint IP, before the WG tunnel exists) via the new endpoint:
POST /api/cells/peer-sync/accept-invite
Cell B auto-adds Cell A as a WireGuard peer and DNS forward, completing
the bidirectional tunnel without any manual action on Cell B's UI.
The endpoint is idempotent and unauthenticated (runs before WG tunnel).
Previously, the pairing was one-sided: Cell A had Cell B as a WG peer
but Cell B never had Cell A — the tunnel never established and all
cross-cell operations silently failed.
**Conflict detection (add_connection + accept-invite)**
_check_invite_conflicts() now validates before connecting:
- VPN subnet must not overlap own subnet or any already-connected cell's subnet
- Domain must not match own domain or any already-connected cell's domain
Returns clear error messages so the admin knows which cell to reconfigure.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds the ability to route a specific peer's internet traffic through a
connected cell acting as an exit relay.
Cell A side:
- PUT /api/peers/<peer>/route-via {"via_cell": "cellB"} sets route_via
- Updates WG AllowedIPs to include 0.0.0.0/0 for the exit cell peer
- Adds ip rule + ip route in policy table inside cell-wireguard so the
specific peer's traffic egresses via cellB's WG IP
- Sets exit_relay_active on the cell link and pushes use_as_exit_relay=True
to cellB via peer-sync
Cell B side:
- Receives use_as_exit_relay in the peer-sync payload
- Calls apply_cell_rules(..., exit_relay=True) to add FORWARD -o eth0 ACCEPT
- Stores remote_exit_relay_active flag for startup recovery
Startup recovery:
- apply_all_cell_rules passes exit_relay=remote_exit_relay_active (cellB)
- _apply_startup_enforcement reapplies ip rule for each peer with route_via (cellA)
since policy routing rules don't survive container restart
peer_registry gets route_via field with lazy migration.
22 new tests across test_cell_link_manager, test_peer_registry, test_peer_route_via.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds the ability for a cell to signal to a peer that it's willing to
route internet traffic on their behalf. This is the signaling layer
for Phase 3 (per-peer routing via exit cell).
Changes:
- cell_links.json: exit_offered (bool) + remote_exit_offered (bool)
fields with lazy migration (default false for existing records)
- _push_permissions_to_remote: includes exit_offered in the push body
- apply_remote_permissions: accepts exit_offered kwarg; stores it as
remote_exit_offered on the matching cell link
- peer-sync receiver: passes exit_offered from body to apply_remote_permissions
- CellLinkManager.set_exit_offered(cell_name, offered): persists +
triggers push so the remote learns of our offer immediately
- PUT /api/cells/<name>/exit-offer: REST endpoint to toggle the flag
- 12 new tests covering all new paths
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
MASQUERADE rewrites the source IP of forwarded packets from
the cell's WG address (10.0.x.1) to cell-wireguard's bridge
IP (172.20.x.9). The peer-sync endpoint authenticates callers
by checking that the source IP is inside a known cell's vpn_subnet,
so MASQUERADE caused all pushes to fail with 403.
Fix: _push_permissions_to_remote() now calls _local_wg_ip() to
get the local wg0 address and passes it as X-Forwarded-For.
_authenticate_peer_cell() already supports XFF for exactly this
proxying scenario. Also adds a test verifying the header is present
in the constructed curl command.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
cell-api has no route to remote WG tunnel IPs — only cell-wireguard does.
Fix _push_permissions_to_remote() to use 'docker exec cell-wireguard curl'
so outbound sync HTTP traverses the WG tunnel from the right namespace.
On the receive side, add ensure_cell_api_dnat() which installs three
iptables rules inside cell-wireguard on startup:
- PREROUTING DNAT: wg0:3000 → cell-api:3000 (Docker bridge IP)
- POSTROUTING MASQUERADE: so cell-api's reply routes back via wg0
- FORWARD ACCEPT: allow the wg0→eth0 forwarded traffic
Called from _apply_startup_enforcement() so rules survive container restarts.
Tests updated to mock subprocess.run instead of urllib.request.urlopen.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
When PIC A updates service sharing permissions, it immediately pushes
the mirrored state to PIC B over the WireGuard tunnel so B's UI shows
what A is sharing with it in real time.
Architecture:
- Push model: update_permissions() → _push_permissions_to_remote() →
POST /api/cells/peer-sync/permissions on remote cell
- Auth: source IP must be inside a known cell's vpn_subnet (WireGuard
tunnel proves identity) + body's from_public_key must match stored key
- Mirror semantics: our inbound (what we share) → their outbound view
- Non-fatal: push failures set pending_push=True; replay_pending_pushes()
retries at startup so offline cells catch up on reconnect
- add_connection() also pushes initial state so remote sees permissions
immediately on the first connect
New fields on cell_links.json records (lazy-migrated):
remote_api_url, last_push_status, last_push_at, last_push_error,
pending_push, last_remote_update_at
New endpoint: POST /api/cells/peer-sync/permissions
30 new tests (1101 total).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Phase 1 — connection fixes:
- routing_manager.stop(): remove iptables -F / -t nat -F nuclear flush that
would wipe WireGuard MASQUERADE and all peer rules on any UI stop action
- wireguard_manager.add_cell_peer(): reject vpn_subnet that overlaps the local
WG network (routing blackhole — was the root cause of no handshake)
- wireguard_manager._syncconf(): pass Endpoint to 'wg set' so cell peers with
static endpoints are synced to the kernel (not just AllowedIPs)
Phase 2 — service-sharing permissions backend:
- firewall_manager: add _cell_tag(), clear_cell_rules(), apply_cell_rules(),
apply_all_cell_rules() — iptables FORWARD rules for cell-to-cell traffic
using 'pic-cell-<name>' comment tags, distinct from 'pic-peer-*'
- app.py startup enforcement: call apply_all_cell_rules(cell_links) so rules
survive API restarts
- cell_link_manager: permissions schema {inbound, outbound} per service;
lazy migration for existing entries; update_permissions(), get_permissions();
apply_cell_rules wired into add_connection/remove_connection
- routes/cells.py: GET /api/cells/services, GET+PUT /api/cells/<n>/permissions;
RuntimeError now returns 400 (not 500) from add_connection
Removed broken 'test' cell (subnet 10.0.0.0/24 collided with local WG network).
Second PIC must use a distinct subnet (e.g. 10.0.1.0/24) before reconnecting.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Site-to-site WireGuard tunnels between PIC cells with automatic DNS forwarding.
Each cell generates an invite JSON (public key, endpoint, VPN subnet, DNS IP,
domain); the remote cell imports it to establish a bidirectional tunnel and
CoreDNS forwarding block so each cell's domain resolves across the mesh.
Backend:
- CellLinkManager: invite generation, add/remove connections, live WireGuard
handshake status; stores links in data/cell_links.json
- WireGuardManager: add_cell_peer() accepts subnet CIDRs (not /32) and an
optional endpoint for site-to-site peers; _read_iface_field() reads port,
address, and network directly from wg0.conf at runtime instead of constants
- NetworkManager: add/remove CoreDNS forwarding blocks per remote cell domain
- app.py: /api/cells/* routes; _next_peer_ip() derives VPN range from
configured address so peer allocation follows any address change
Frontend:
- CellNetwork page: invite panel (JSON + QR), connect form (paste JSON),
connected cells list (green/red status, disconnect button)
- App.jsx: Cell Network nav entry and route
Tests: 25 new tests across test_wireguard_manager, test_network_manager,
test_cell_link_manager (263 total)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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