Two gaps allowed a cell to take a domain already in use by a connected cell:
1. PUT /api/config domain change: added check against cell_link_manager's
connected cells list before saving — returns 409 if the new domain
collides with any connected cell's domain.
2. accept_invite healing path: a remote cell changing its domain via a
re-invite was not validated against other connected cells' domains.
Now calls _check_invite_conflicts(invite, exclude_cell=name) before
applying any change.
Also: the healing path now detects domain changes (alongside dns_ip/
vpn_subnet/endpoint), updates the stored domain, and refreshes the DNS
forward rule when the domain changes.
Tests: 3 new domain-conflict tests in test_config_validation.py;
3 new accept_invite healing tests in test_cell_link_manager.py.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Sprint 1 — Security & correctness:
- Restore all 10 commented-out is_local_request() checks (vault, containers, images, volumes)
- Fix XFF spoofing: only trust the LAST X-Forwarded-For entry (Caddy's append), not all
- Require prefix length in wireguard.address (was accepting bare IPs like 10.0.0.1)
- Validate service_access list in add_peer (valid: calendar/files/mail/webdav)
- Fix dhcp/reservations POST/DELETE: unpack mac/ip/hostname from body (was passing dict as positional arg)
- Fix network/test POST: remove spurious data arg (test_connectivity takes no args)
- Fix remove_peer: clear iptables rules and regenerate DNS ACLs on deletion (was leaving stale rules)
- Fix CoreDNS reload: SIGHUP → SIGUSR1 (SIGHUP kills the process; SIGUSR1 triggers reload plugin)
- Remove local.{domain} block from Corefile template (local.zone doesn't exist, caused log spam)
- Fix routing_manager._remove_nat_rule: targeted -D instead of flushing entire POSTROUTING chain
Sprint 2 — State consistency:
- Atomic config writes in config_manager, ip_utils, firewall_manager, network_manager
(write to .tmp → fsync → os.replace, prevents truncated files on kill)
- backup_config: now also backs up Caddyfile, Corefile, .env, DNS zone files
- restore_config: restores all of the above so config stays consistent after restore
Sprint 3 — Dead code / documentation:
- Remove CellManager instantiation from app startup (was never called, double-instantiated all managers)
- Document routing_manager scope (targets host, not cell-wireguard; methods not called by any active route)
Sprint 4 — Test infrastructure:
- Add tests/conftest.py with shared tmp_dir, tmp_config_dir, tmp_data_dir, flask_client fixtures
- Add tests/test_config_validation.py: 400 paths for ip_range, port, wireguard.address validation
- Add tests/test_ip_utils_caddyfile.py: 14 tests for write_caddyfile (was completely untested)
- Expand test_app_misc.py: 7 new is_local_request tests covering XFF spoofing and cell-network IPs
- Add --cov-fail-under=70 to make test-coverage
- Add pre-commit hook that runs pytest before every commit
414 tests pass (was 372).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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