mirror of
https://github.com/jmcorgan/fips.git
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Johnathan Corgan
bf77ececad
The previous default configured systemd-resolved with `resolvectl dns fips0 [<fips0_addr>]:5354`, intended to bypass an Ubuntu 22 systemd 249 interface-scoping bug. That target collides with the daemon's mesh-interface filter on Linux: when an IPv6 packet's destination belongs to a non-loopback interface, the kernel attributes the packet to that interface in IPV6_PKTINFO (ipi6_ifindex == fips0) even though loopback delivery is used (tcpdump shows lo). The mesh-interface filter sees arrival_ifindex == mesh_ifindex and silently drops every query at trace level — invisible to operators at the default debug level. Net effect on stock deployments: every .fips query on systemd-resolved hosts was silently dropped. Daemon side ----------- - Default `dns.bind_addr` changes from "::" to "::1" (IPv6 loopback only). The mesh-interface filter is then defanged on the default path because loopback isn't reachable from mesh peers. The filter remains in place defensively for operators who explicitly bind "::" to expose a mesh-reachable responder. fips-dns-setup backend unification ---------------------------------- - New `try_global_drop_in` backend writes /etc/systemd/resolved.conf.d/fips.conf with DNS=[::1]:5354 and Domains=~fips. Inserted ahead of `try_resolvectl` in the dispatch chain. The standard loopback path has no interface scoping, so ipi6_ifindex reports lo and the filter passes. - All other backends now target [::1]:5354 to match the daemon's default IPv6-loopback bind: - try_dns_delegate writes DNS=[::1]:5354 - try_dnsmasq writes server=/fips/::1#5354 - try_nm_dnsmasq writes server=/fips/::1#5354 - Fixed dns-delegate file path: was /etc/systemd/dns-delegate/, must be /etc/systemd/dns-delegate.d/ (with .d suffix). systemd-resolved silently ignored the previous path. - fips-dns-teardown handles the new global-drop-in backend in cleanup. - The legacy resolvectl per-link backend stays as a fallback, documented to require careful daemon bind_addr coordination. fips-gateway upstream pairing ----------------------------- - gateway.dns.upstream default changes from 127.0.0.1:5354 to [::1]:5354 to match the daemon's default bind. Linux IPv6 sockets bound to explicit ::1 do not accept v4-mapped traffic, so the old default would have caused the gateway's startup DNS reachability probe to time out and systemd to restart-loop the service. - Operators who set a non-default daemon `dns.bind_addr` must also set `gateway.dns.upstream` to match — documented inline. Documentation ------------- - packaging/common/fips.yaml and packaging/openwrt-ipk fips.yaml examples updated; rationale for the bind_addr choice and the daemon/gateway pairing recorded inline. Test coverage ------------- - testing/dns-resolver/test.sh: real-fipsd end-to-end scenario added. Builds fipsd in a Debian 12 builder image (cached), runs the daemon with a real TUN in a privileged container, configures DNS via the setup script, and asserts `dig @127.0.0.53 AAAA <npub>.fips` returns AAAA. Refactored as a parameterized helper running across Debian 12/13 and Ubuntu 22/24/26 (5 e2e scenarios). Backend-aware assertions: on systemd >= 258 the expected backend is dns-delegate; on older systemd it's global-drop-in. Strict content checks fail CI on any [::1]:5354 drift. fips-gateway also exercised in the debian12 scenario to lock the gateway-upstream pairing. Renamed all "fipsd" references to "fips" (project convention). - testing/deb-install/ (new harness): builds the actual .deb via cargo-deb in a Debian 12 builder image (cached), installs via apt across each target distro, verifies maintainer scripts, conffile placement, binary placement, and end-to-end .fips resolution after start. Also exercises fips-gateway against the installed daemon to verify the gateway/daemon default pairing on a real .deb path. - This is the test layer that was missing — the previous harness only verified config files were written, never that queries reached the daemon. Verified: dns-resolver 78/78 assertions, deb-install 55/55 assertions across all 5 distros (debian:12, debian:trixie, ubuntu:22.04, ubuntu:24.04, ubuntu:26.04).
119 lines
3.8 KiB
YAML
119 lines
3.8 KiB
YAML
# FIPS Node Configuration
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node:
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identity:
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# By default, a new ephemeral keypair is generated on each start.
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# Uncomment persistent to keep the same identity across restarts;
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# on first start a keypair is saved to fips.key/fips.pub next to
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# this config file (mode 0600/0644).
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# persistent: true
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#
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# Or set an explicit key (overrides persistent):
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# nsec: "nsec1..."
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discovery:
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# Optional Nostr-mediated overlay endpoint discovery.
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# Requires a build of fips compiled with the 'nostr-discovery' feature.
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# nostr:
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# enabled: true
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# policy: configured_only # disabled | configured_only | open
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# open_discovery_max_pending: 64 # caps queued open-discovery retries
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# app: "fips-overlay-v1"
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# advertise: true
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# advert_relays:
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# - "wss://relay.damus.io"
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# - "wss://nos.lol"
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# - "wss://offchain.pub"
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# dm_relays:
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# - "wss://relay.damus.io"
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# - "wss://nos.lol"
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# - "wss://offchain.pub"
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# # Optional override. If omitted, FIPS uses the built-in STUN list.
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# # Built-in relay/STUN defaults are best-effort and should be
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# # overridden by operators for production use.
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# stun_servers:
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# - "stun:stun.l.google.com:19302"
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# - "stun:stun.cloudflare.com:3478"
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# - "stun:global.stun.twilio.com:3478"
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tun:
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enabled: true
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name: fips0
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mtu: 1280
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dns:
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enabled: true
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# bind_addr defaults to "::1" (IPv6 loopback). The shipped
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# fips-dns-setup script configures systemd-resolved with a global
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# /etc/systemd/resolved.conf.d/fips.conf drop-in pointing at
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# [::1]:5354.
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#
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# Set "::" to expose the responder to mesh peers as well (e.g. for
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# gateway hosts that resolve .fips on behalf of LAN clients). The
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# mesh-interface filter in src/upper/dns.rs will still defend
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# /etc/fips/hosts aliases from cross-mesh enumeration.
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# bind_addr: "::1"
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port: 5354
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transports:
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udp:
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bind_addr: "0.0.0.0:2121"
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# advertise_on_nostr: true
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# public: false # false => advertise udp:nat; true => advertise bound host:port
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tcp:
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# Accepts inbound connections. No static outbound peers.
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bind_addr: "0.0.0.0:8443"
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# advertise_on_nostr: true
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# Ethernet transport — uncomment and set your interface name.
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# ethernet:
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# interface: "eth0"
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# discovery: true
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# announce: true
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# auto_connect: true
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# accept_connections: true
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# Bluetooth Low Energy transport — requires BlueZ and the 'ble' feature.
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# ble:
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# adapter: "hci0"
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# mtu: 2048
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# advertise: true
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# scan: true
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# auto_connect: true
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# accept_connections: true
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# Outbound LAN gateway. Allows non-FIPS hosts on the LAN to reach
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# mesh destinations via DNS-allocated virtual IPs and kernel NAT.
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# Requires: IPv6 forwarding enabled, fips daemon running with DNS.
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# gateway:
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# enabled: true
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# pool: "fd01::/112"
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# lan_interface: "eth0"
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# dns:
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# listen: "[::]:53"
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# # upstream must match the daemon's dns.bind_addr above. The
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# # default "[::1]:5354" matches the daemon's default. If you set
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# # the daemon to bind on a wildcard ("::") or specific address,
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# # update upstream to match — explicit ::1 sockets do not accept
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# # v4 traffic.
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# upstream: "[::1]:5354"
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# ttl: 60
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# pool_grace_period: 60
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# conntrack:
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# tcp_established: 432000
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# udp_timeout: 30
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# udp_assured: 180
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# icmp_timeout: 30
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peers: []
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# Static peers for bootstrapping (UDP or TCP):
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# - npub: "npub1qmc3cvfz0yu2hx96nq3gp55zdan2qclealn7xshgr448d3nh6lks7zel98"
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# alias: "gateway"
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# via_nostr: true
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# addresses:
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# - transport: udp
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# addr: "217.77.8.91:2121" # IP or hostname (e.g., "peer.example.com:2121")
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# - transport: udp
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# addr: "nat" # Use node.discovery.nostr for Nostr/STUN hole punching
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# connect_policy: auto_connect
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