The public IP was previously detected independently in three places,
each contacting a different third party: the Hub (HTTPS echo via
api.ipify.org / ifconfig.me / icanhazip.com on every API call and
background tick), DDNS (myip.opendns.com via OpenDNS), and LiveKit
(embedded STUN). Consolidate into a single detector with one shared
cache so every consumer reads the same value with minimal exposure.
- add modules/core/public-ip.nix: installs /var/lib/sovran/public-ip.py
(pure Python stdlib, no new deps) writing /var/lib/secrets/external-ip
- detection chain (first success wins): explicit pin, fresh cache
(default TTL 300s), STUN binding request over UDP (one packet, no
metadata), DNS myip.opendns.com query, then OPT-IN HTTPS echo
(publicIP.httpsEcho, empty by default — never contacted unless listed)
- privacy: while the cache is fresh zero third parties are contacted;
at most one party learns the IP per refresh interval, via the least
exposing mechanism available
- hub (server.py): _get_external_ip() now reads the shared detector /
cache instead of calling ipify/ifconfig/icanhazip directly
- ddns (njalla.nix): use the shared detector instead of a separate
OpenDNS dig; allow the hardened service to write /var/lib/secrets
- element-calling: livekit-turn-setup falls back to the shared
detector on cold boot; add LiveKit webhooks to lk-jwt-service
(sfu_webhook) so abrupt disconnects are cleaned up immediately;
set LIVEKIT_SANITY_CHECK_INTERVAL_SECONDS=60 as a missed-webhook
guard; drop the dead services.livekit.settings block and set
openFirewall=false (Caddy fronts the SFU; no public 7880/tcp)
- new options: sovran_systemsOS.publicIP.{stunServer,stunPort,
dnsResolver,httpsEcho,cacheTTL}
- Add modules/core/local-domain-loopback.nix: systemd service and
activation script that write configured service domains to a
Sovran-managed block in /etc/hosts (127.0.0.1 / ::1) so requests
originating on this computer reach Caddy without NAT loopback.
- Import local-domain-loopback.nix in modules/modules.nix.
- server.py: add _validate_domain_value, _is_loopback_address,
_resolve_all_addresses, _trigger_hosts_update helpers.
- server.py: update _check_domain_reachable to use --resolve so
reachability is checked locally via Caddy, not via NAT loopback.
- server.py: update _evaluate_domain_checklist, api_services inline DNS
check, and api_domains_check to recognise loopback resolution as an
intentional local override rather than a DNS mismatch.
- server.py: call _trigger_hosts_update from api_domains_set after
saving a service domain so the /etc/hosts entry is applied immediately.
- Add app/tests/test_loopback_diagnostics.py with 47 tests covering
domain validation, loopback detection, diagnostic checklist logic,
composite health, and api_domains_check."
naturallaw777
copilot-swe-agent[bot]
