Add port forwards and WAN-originated firewall rules
Extend router.firewall.rules with a reserved `wan` source zone: DNAT (dnat, toPort), port ranges, source allow-lists, per-source rate limits, logging and optional hairpin NAT. IPv6 is opened only by explicit pinholes. Build-time assertions require WAN rules to name a destination, protocol and ports so a typo cannot expose a whole zone. Covered by the basic/pppoe VM tests and the assertion tests. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
Claude Sonnet 5.5
@@ -79,7 +79,7 @@ Learned along the way:
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- In NixOS tests `fail(...)` also passes on "command not found": install probe tools explicitly and add a positive control per negative check.
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- Unbound answers `.test` locally (RFC 6761) and validates DNSSEC; tests using fake domains need both `local-zone ... transparent` and `domain-insecure` (both verified necessary; set in the test, not the module).
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- `modules/router/lib.nix` has IPv4 helpers (parse/format/netmask/cidr/overlap). `ipv4.subnet` is now derived from `address` + `prefixLength` (read-only). Assertions also cover pool bounds, pool containing the router address, and overlapping LANs. IPv6 helpers (prefix arithmetic for PD subnet-IDs) are still to do.
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- Checks: `basic`, `pppoe`, `vlans` and `wireguard` (VM tests), `lib` (helper unit tests), `assertions` (broken configs must fail with exact messages). Not yet covered: port forwards, WAN-originated rules, NPTv6.
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- Checks: `basic`, `pppoe`, `vlans` and `wireguard` (VM tests), `lib` (helper unit tests), `assertions` (broken configs must fail with exact messages). Not yet covered: NPTv6.
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## IPv6 design (confirmed)
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@@ -105,6 +105,14 @@ Learned along the way:
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- Router services stay per LAN: DNS and DHCP always, SSH only with `allowManagement`.
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- Kea subnet IDs are derived from the network address, so adding or removing LANs does not shift IDs (and orphan persistent leases).
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## Port forwards (confirmed)
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- Implemented by extending `router.firewall.rules` with a reserved source zone `wan` (no LAN/tunnel may use that zone name; `wan` is never a destination).
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- Extra rule fields: `dnat` (IPv4 only, single host destination, tcp/udp), `toPort`, port ranges (`"9000-9002"`), `sources` allow-list (v4/v6 CIDRs), `rateLimit` (`N/second|minute|hour`, per source via nft meter), `log`, `hairpin` (NAT loopback for LANs/tunnels with `internet = true`; masquerades so replies return via the router).
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- Safeguards: a rule from `wan` must name a destination, an explicit protocol and its ports, so a typo cannot expose a whole zone.
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- IPv6 has no NAT: it is opened only by explicit pinholes (`from = "wan"`, IPv6 `destination`). The prefix is dynamic, so v6 destinations are not checked against the zone.
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- Tested in `basic`/`pppoe` (source preserved, toPort, ranges, sources, rate limit, v6 pinhole, hairpin, log lines) and in `assertions`; mutation-tested (source match, hairpin masquerade, rate limit).
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## WireGuard (confirmed)
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- **Use cases**: road warrior (listening, dual-stack), site-to-site (no transfer network), and a provider VPN the router dials into (dual-stack transfer net, masquerade). All via `router.wireguard.<name>`.
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@@ -96,25 +96,46 @@ let
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}) (lib.filter (l: l.zone == zone && validIp l.ipv4.address) lans)
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++ lib.concatMap wgV4Nets (lib.filter (w: w.zone == zone) wgs);
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portOk =
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p:
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if builtins.isInt p then
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p >= 1 && p <= 65535
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else
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let
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m = builtins.match "([0-9]+)-([0-9]+)" p;
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lo = lib.toInt (builtins.elemAt m 0);
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hi = lib.toInt (builtins.elemAt m 1);
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in
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lo >= 1 && hi <= 65535 && lo < hi;
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ruleAssertions =
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r:
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let
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where = "router.firewall.rules (${r.from} -> ${r.to})";
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dest = if r.destination == null then null else ipv4.parseNet r.destination;
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fromWan = r.from == "wan";
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v6Dest = r.destination != null && isV6 r.destination;
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dest = if r.destination == null || v6Dest then null else ipv4.parseNet r.destination;
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inZone =
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dest != null
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&& lib.any (n: dest.prefixLength >= n.prefixLength && ipv4.inSubnet n dest.address) (
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zoneV4Nets r.to
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);
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singleHost = dest != null && dest.prefixLength == 32;
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plainPorts = lib.all builtins.isInt r.ports;
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internetMember = lib.any (l: l.internet) lans || lib.any (w: w.internet) wgs;
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in
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[
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{
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assertion = lib.elem r.from zoneNames;
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message = "router: ${where}: unknown source zone `${r.from}` (zones: ${lib.concatStringsSep ", " zoneNames}).";
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assertion = fromWan || lib.elem r.from zoneNames;
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message = "router: ${where}: unknown source zone `${r.from}` (zones: wan, ${lib.concatStringsSep ", " zoneNames}).";
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}
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{
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assertion = lib.elem r.to zoneNames;
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message = "router: ${where}: unknown destination zone `${r.to}` (zones: ${lib.concatStringsSep ", " zoneNames}).";
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message =
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if r.to == "wan" then
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"router: ${where}: `wan` cannot be a destination; use `internet = true` on the LAN or tunnel."
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else
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"router: ${where}: unknown destination zone `${r.to}` (zones: ${lib.concatStringsSep ", " zoneNames}).";
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}
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{
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assertion = r.from != r.to;
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@@ -124,20 +145,93 @@ let
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assertion = r.ports == [ ] || r.protocol == "tcp" || r.protocol == "udp";
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message = "router: ${where}: ports are only valid with protocol tcp or udp.";
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}
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{
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assertion = lib.all portOk r.ports;
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message = "router: ${where}: a port or port range is out of range (1-65535, ranges need low < high).";
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}
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{
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assertion = lib.all validCidr (
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map (
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x:
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if lib.hasInfix "/" x then
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x
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else if isV6 x then
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"${x}/128"
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else
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"${x}/32"
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) r.sources
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);
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message = "router: ${where}: every source must be an IPv4/IPv6 address or CIDR.";
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}
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]
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# Rules from the outside must not be able to expose a whole zone by accident.
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++ lib.optionals fromWan [
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{
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assertion = r.destination != null;
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message = "router: ${where}: rules from `wan` must name a destination host or network.";
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}
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{
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assertion = r.protocol != "any";
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message = "router: ${where}: rules from `wan` must name a protocol (tcp, udp or icmp).";
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}
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{
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assertion = r.protocol == "icmp" || r.protocol == "any" || r.ports != [ ];
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message = "router: ${where}: rules from `wan` must list the ports they open.";
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}
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]
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++ lib.optionals (r.destination != null) [
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{
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assertion = dest != null;
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assertion = v6Dest || dest != null;
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message = "router: ${where}: destination `${r.destination}` is not a valid IPv4 address or CIDR.";
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}
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{
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assertion = dest == null || !(lib.elem r.to zoneNames) || inZone;
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assertion = v6Dest || dest == null || !(lib.elem r.to zoneNames) || inZone;
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message = "router: ${where}: destination `${r.destination}` is not inside any network of zone `${r.to}`.";
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}
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{
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assertion = dest == null || ipv4.networkOf dest.address dest.prefixLength == dest.address;
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assertion = v6Dest || dest == null || ipv4.networkOf dest.address dest.prefixLength == dest.address;
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message = "router: ${where}: destination `${r.destination}` has host bits set.";
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}
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{
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assertion =
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!v6Dest
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|| v6Cidr (if lib.hasInfix "/" r.destination then r.destination else "${r.destination}/128");
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message = "router: ${where}: destination `${r.destination}` is not a valid IPv6 address or CIDR.";
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}
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]
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++ lib.optionals r.dnat [
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{
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assertion = fromWan;
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message = "router: ${where}: dnat is only valid for rules from `wan`.";
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}
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{
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assertion = singleHost;
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message = "router: ${where}: dnat needs a single IPv4 host as destination.";
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}
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{
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assertion = r.protocol == "tcp" || r.protocol == "udp";
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message = "router: ${where}: dnat needs protocol tcp or udp.";
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}
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{
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assertion = lib.all (x: !isV6 x) r.sources;
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message = "router: ${where}: dnat is IPv4-only, so its sources must be IPv4.";
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}
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]
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++ lib.optionals (r.toPort != null) [
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{
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assertion = r.dnat && lib.length r.ports == 1 && plainPorts;
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message = "router: ${where}: toPort needs dnat and exactly one (non-range) port.";
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}
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]
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++ lib.optionals r.hairpin [
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{
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assertion = r.dnat;
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message = "router: ${where}: hairpin only applies to dnat rules.";
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}
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{
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assertion = internetMember;
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message = "router: ${where}: hairpin needs at least one LAN or tunnel with internet = true.";
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}
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];
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overlapsLan = n: lib.any (l: ipv4.overlaps n l) lanNets;
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@@ -246,6 +340,12 @@ in
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]
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++ lib.concatLists (lib.mapAttrsToList perLan lansByName)
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++ lib.concatMap ruleAssertions cfg.firewall.rules
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++ [
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{
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assertion = !(lib.elem "wan" zoneNames);
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message = "router: `wan` is a reserved zone name; give the LAN or tunnel a different `zone`.";
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}
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]
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++ lib.concatLists (lib.mapAttrsToList wgAssertions cfg.wireguard)
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++ [
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{
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+120
-12
@@ -60,21 +60,121 @@ let
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) zones
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);
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ruleToNft =
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setOf = xs: "{ ${lib.concatMapStringsSep ", " toString xs} }";
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# Layer 4 match; `ports` may be ints or "a-b" ranges.
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l4 =
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proto: ports:
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if proto == "any" then
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""
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else if proto == "icmp" then
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"meta l4proto { icmp, ipv6-icmp } "
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else
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"${proto} dport ${if ports == [ ] then "1-65535" else setOf ports} ";
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# Destination match, by family of the address.
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daddrOf =
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r:
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lib.optionalString (r.destination != null) (
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"${if isV6 r.destination then "ip6" else "ip"} daddr ${r.destination} "
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);
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# One variant per source family; no sources means one unrestricted variant.
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# `key` is the family selector used for per-source rate limiting (null: both).
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variantsOf =
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r:
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let
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dest = lib.optionalString (r.destination != null) "ip daddr ${r.destination} ";
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proto =
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if r.protocol == "any" then
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""
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else if r.protocol == "icmp" then
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"meta l4proto { icmp, ipv6-icmp } "
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v4 = lib.filter (x: !isV6 x) r.sources;
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v6 = lib.filter isV6 r.sources;
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destFamily =
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if r.destination == null then
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null
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else if isV6 r.destination then
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"ip6"
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else
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"${r.protocol} dport ${
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if r.ports == [ ] then "1-65535" else "{ ${lib.concatMapStringsSep ", " toString r.ports} }"
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} ";
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"ip";
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in
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"iifname ${set (zoneDevices r.from)} oifname ${set (zoneDevices r.to)} ${dest}${proto}accept # ${r.from} -> ${r.to}";
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if r.sources == [ ] then
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[
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{
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src = "";
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key = destFamily;
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}
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]
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else
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lib.optional (v4 != [ ]) {
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src = "ip saddr ${setOf v4} ";
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key = "ip";
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}
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++ lib.optional (v6 != [ ]) {
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src = "ip6 saddr ${setOf v6} ";
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key = "ip6";
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};
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# Everything one rule contributes. Indexed so meters/prefixes are unique.
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ruleParts =
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i: r:
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let
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id = toString i;
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label = "${r.from}->${r.to}";
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fromDevs = if r.from == "wan" then uplinks else zoneDevices r.from;
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toDevs = zoneDevices r.to;
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# After DNAT the packet carries the translated port.
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fwdPorts = if r.dnat && r.toPort != null then [ r.toPort ] else r.ports;
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base = "iifname ${set fromDevs} oifname ${set toDevs} ${daddrOf r}${l4 r.protocol fwdPorts}${lib.optionalString r.dnat "ct status dnat "}";
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logPrefix = what: ''log prefix "router fwd#${id} ${label} ${what}: " '';
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limitLines =
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v:
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lib.optionals (r.rateLimit != null) (
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map
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(
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k:
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"${base}${v.src}ct state new meter rl${id}-${k} { ${k} saddr limit rate over ${r.rateLimit} } ${lib.optionalString r.log (logPrefix "rate-limited")}drop"
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)
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(
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if v.key == null then
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[
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"ip"
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"ip6"
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]
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else
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[ v.key ]
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)
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);
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acceptLines =
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v:
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lib.optional r.log "${base}${v.src}ct state new ${logPrefix "accepted"}"
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++ [ "${base}${v.src}accept # ${label}" ];
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dnatTarget = "dnat to ${r.destination}${
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lib.optionalString (r.toPort != null) ":${toString r.toPort}"
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}";
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in
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{
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forward = lib.concatMap (v: limitLines v ++ acceptLines v) (variantsOf r);
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prerouting =
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lib.optionals r.dnat (
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map (v: "iifname ${set uplinks} ${v.src}${l4 r.protocol r.ports}${dnatTarget} # ${label}") (
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variantsOf r
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)
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)
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# NAT loopback: internal clients addressing the router's public address.
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++
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lib.optional (r.dnat && r.hairpin)
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"iifname ${set internetIfaces} fib daddr type local ip daddr != ${setOf internalAddrs} ${l4 r.protocol r.ports}${dnatTarget} # hairpin ${label}";
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hairpinForward = lib.optional (r.dnat && r.hairpin) (
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"iifname ${set internetIfaces} oifname ${set toDevs} ip daddr ${r.destination} ${l4 r.protocol fwdPorts}ct status dnat accept # hairpin ${label}"
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);
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};
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parts = lib.imap0 ruleParts cfg.firewall.rules;
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anyHairpin = lib.any (r: r.dnat && r.hairpin) cfg.firewall.rules;
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# Addresses the router itself holds on internal interfaces; anything else
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# that is local is a public (uplink) address.
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internalAddrs =
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map (l: l.ipv4.address) lans
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++ map (a: builtins.head (lib.splitString "/" a)) (
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lib.filter (a: !isV6 a) (lib.concatMap (w: w.addresses) wgs)
|
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);
|
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|
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uplink4 = cfg.wan.ipv4.interface;
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pppoe = cfg.wan.ipv4.type == "pppoe";
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@@ -146,7 +246,9 @@ in
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) "iifname ${set internetIfaces} oifname ${set uplinks} accept"}
|
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|
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# Zones: free inside a zone, denied between zones unless a rule says so.
|
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${lib.concatStringsSep "\n " (intraZone ++ map ruleToNft cfg.firewall.rules)}
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${lib.concatStringsSep "\n " (
|
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intraZone ++ lib.concatMap (p: p.hairpinForward ++ p.forward) parts
|
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)}
|
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}
|
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'';
|
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};
|
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@@ -154,9 +256,15 @@ in
|
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networking.nftables.tables.router-nat = {
|
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family = "ip";
|
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content = ''
|
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chain prerouting {
|
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type nat hook prerouting priority dstnat; policy accept;
|
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${lib.concatStringsSep "\n " (lib.concatMap (p: p.prerouting) parts)}
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}
|
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|
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chain postrouting {
|
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type nat hook postrouting priority srcnat; policy accept;
|
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oifname "${uplink4}" masquerade
|
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${lib.optionalString anyHairpin "ct status dnat iifname ${set memberIfaces} oifname ${set memberIfaces} masquerade # hairpin"}
|
||||
${lib.optionalString (
|
||||
masqueradeIfaces != [ ]
|
||||
) "oifname ${set masqueradeIfaces} masquerade # tunnels"}
|
||||
|
||||
@@ -317,14 +317,18 @@ in
|
||||
description = ''
|
||||
Allow rules between zones, on top of the default (deny between zones).
|
||||
Rules are one-directional; return traffic is allowed by connection
|
||||
tracking. Both ends must be zones of LANs defined in `router.lans`.
|
||||
tracking. `to` must be the zone of a LAN or tunnel; `from` may also be
|
||||
the reserved zone `wan` (traffic arriving on the uplinks), which
|
||||
publishes services to the outside: such rules must name a
|
||||
`destination` and protocol (and ports for tcp/udp), so a typo cannot
|
||||
expose a whole zone.
|
||||
'';
|
||||
type = types.listOf (
|
||||
types.submodule {
|
||||
options = {
|
||||
from = mkOption {
|
||||
type = types.str;
|
||||
description = "Source zone.";
|
||||
description = "Source zone, or `wan`.";
|
||||
};
|
||||
to = mkOption {
|
||||
type = types.str;
|
||||
@@ -340,9 +344,17 @@ in
|
||||
default = "any";
|
||||
};
|
||||
ports = mkOption {
|
||||
type = types.listOf types.port;
|
||||
type = types.listOf (types.either types.port (types.strMatching "[0-9]+-[0-9]+"));
|
||||
default = [ ];
|
||||
description = "Destination ports (tcp/udp only); empty means all ports.";
|
||||
example = [
|
||||
443
|
||||
"50000-50100"
|
||||
];
|
||||
description = ''
|
||||
Destination ports or ranges (tcp/udp only); empty means all
|
||||
ports. With `dnat` these are the ports on the router's
|
||||
public address.
|
||||
'';
|
||||
};
|
||||
destination = mkOption {
|
||||
type = types.nullOr types.str;
|
||||
@@ -350,9 +362,50 @@ in
|
||||
example = "192.168.10.5";
|
||||
description = ''
|
||||
Restrict the rule to an IPv4 address or CIDR inside the
|
||||
destination zone; null means the whole zone.
|
||||
destination zone; null means the whole zone. IPv6 addresses
|
||||
are accepted too (for pinholes) but cannot be checked against
|
||||
the zone, because delegated prefixes are not known at build time.
|
||||
'';
|
||||
};
|
||||
sources = mkOption {
|
||||
type = types.listOf types.str;
|
||||
default = [ ];
|
||||
example = [ "198.51.100.0/24" ];
|
||||
description = "Only match traffic from these IPv4/IPv6 addresses or CIDRs; empty means any source.";
|
||||
};
|
||||
dnat = mkOption {
|
||||
type = types.bool;
|
||||
default = false;
|
||||
description = ''
|
||||
Port forward: traffic from `wan` to `ports` on the router's
|
||||
public IPv4 address is redirected to `destination` (one IPv4
|
||||
host). The source address is preserved.
|
||||
'';
|
||||
};
|
||||
toPort = mkOption {
|
||||
type = types.nullOr types.port;
|
||||
default = null;
|
||||
description = "Port on `destination` when it differs from the public port (single-port forwards only).";
|
||||
};
|
||||
hairpin = mkOption {
|
||||
type = types.bool;
|
||||
default = false;
|
||||
description = ''
|
||||
Let LANs with `internet = true` reach this forward through the
|
||||
router's public address (NAT loopback, source is masqueraded).
|
||||
'';
|
||||
};
|
||||
rateLimit = mkOption {
|
||||
type = types.nullOr (types.strMatching "[0-9]+/(second|minute|hour)");
|
||||
default = null;
|
||||
example = "10/minute";
|
||||
description = "Limit new connections per source address; the excess is dropped.";
|
||||
};
|
||||
log = mkOption {
|
||||
type = types.bool;
|
||||
default = false;
|
||||
description = "Log new connections accepted by this rule, and connections dropped by `rateLimit` (kernel log).";
|
||||
};
|
||||
};
|
||||
}
|
||||
);
|
||||
|
||||
@@ -506,6 +506,222 @@ let
|
||||
};
|
||||
expect = [ "is not inside any network of zone `s2s`" ];
|
||||
};
|
||||
wanValid = {
|
||||
router = {
|
||||
lans.main = lan { internet = true; };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
dnat = true;
|
||||
toPort = 8081;
|
||||
sources = [ "198.51.100.0/24" ];
|
||||
rateLimit = "3/minute";
|
||||
log = true;
|
||||
hairpin = true;
|
||||
}
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "2001:db8:1::5";
|
||||
protocol = "tcp";
|
||||
ports = [ "9000-9002" ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ ];
|
||||
};
|
||||
wanNoDestination = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = null;
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "must name a destination" ];
|
||||
};
|
||||
wanAnyProtocol = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "any";
|
||||
ports = [ ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "must name a protocol" ];
|
||||
};
|
||||
wanNoPorts = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "must list the ports" ];
|
||||
};
|
||||
toWan = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "main";
|
||||
to = "wan";
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "`wan` cannot be a destination" ];
|
||||
};
|
||||
dnatNeedsHost = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.0/24";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
dnat = true;
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "dnat needs a single IPv4 host" ];
|
||||
};
|
||||
dnatV6Sources = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
dnat = true;
|
||||
sources = [ "2001:db8::/32" ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "its sources must be IPv4" ];
|
||||
};
|
||||
toPortWithoutDnat = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
toPort = 8081;
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "toPort needs dnat" ];
|
||||
};
|
||||
hairpinNoDnat = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
hairpin = true;
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [
|
||||
"hairpin only applies to dnat"
|
||||
"hairpin needs at least one"
|
||||
];
|
||||
};
|
||||
hairpinNoInternet = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
dnat = true;
|
||||
hairpin = true;
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "hairpin needs at least one" ];
|
||||
};
|
||||
badPortRange = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ "9002-9000" ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "out of range" ];
|
||||
};
|
||||
badSource = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "192.168.10.5";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
sources = [ "nonsense" ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "every source must be" ];
|
||||
};
|
||||
badV6Destination = {
|
||||
router = {
|
||||
lans.main = lan { };
|
||||
firewall.rules = [
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = "2001:db8::zz";
|
||||
protocol = "tcp";
|
||||
ports = [ 8080 ];
|
||||
}
|
||||
];
|
||||
};
|
||||
expect = [ "not a valid IPv6" ];
|
||||
};
|
||||
nonOverlappingLans = {
|
||||
router.lans = {
|
||||
a = lan { };
|
||||
@@ -552,6 +768,7 @@ let
|
||||
"vlansOnOneTrunk"
|
||||
"ruleValid"
|
||||
"wgValid"
|
||||
"wanValid"
|
||||
];
|
||||
|
||||
subnet =
|
||||
|
||||
+165
-11
@@ -21,6 +21,9 @@ let
|
||||
ispV4 = if pppoe then "198.51.100.1" else "203.0.113.1";
|
||||
routerV4 = if pppoe then "198.51.100.100" else "203.0.113.100";
|
||||
pppoeVlan = 7;
|
||||
clientV4 = "192.168.10.100";
|
||||
clientV6 = "2001:db8:2::1234";
|
||||
peerV4 = "192.168.10.51";
|
||||
|
||||
inherit (pkgs) lib;
|
||||
# Indent every line but the first (the interpolation site supplies that one).
|
||||
@@ -270,6 +273,51 @@ pkgs.testers.runNixOSTest {
|
||||
};
|
||||
};
|
||||
dns.forwarders = [ ispV4 ];
|
||||
firewall.rules =
|
||||
let
|
||||
fwd =
|
||||
r:
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = clientV4;
|
||||
protocol = "tcp";
|
||||
dnat = true;
|
||||
}
|
||||
// r;
|
||||
in
|
||||
[
|
||||
(fwd {
|
||||
ports = [ 8080 ];
|
||||
hairpin = true;
|
||||
log = true;
|
||||
})
|
||||
(fwd {
|
||||
ports = [ 8083 ];
|
||||
toPort = 8084;
|
||||
})
|
||||
(fwd { ports = [ "9000-9002" ]; })
|
||||
(fwd {
|
||||
ports = [ 8085 ];
|
||||
sources = [ "${ispV4}/32" ];
|
||||
})
|
||||
(fwd {
|
||||
ports = [ 8086 ];
|
||||
sources = [ "192.0.2.0/24" ];
|
||||
})
|
||||
(fwd {
|
||||
ports = [ 8087 ];
|
||||
rateLimit = "3/minute";
|
||||
log = true;
|
||||
})
|
||||
{
|
||||
from = "wan";
|
||||
to = "main";
|
||||
destination = clientV6;
|
||||
protocol = "tcp";
|
||||
ports = [ 8081 ];
|
||||
}
|
||||
];
|
||||
};
|
||||
|
||||
# Unbound answers `.test` locally (RFC 6761) and would validate DNSSEC
|
||||
@@ -281,17 +329,72 @@ pkgs.testers.runNixOSTest {
|
||||
};
|
||||
};
|
||||
|
||||
client = { lib, ... }: {
|
||||
virtualisation.vlans = [ 2 ];
|
||||
networking.useNetworkd = true;
|
||||
networking.useDHCP = false;
|
||||
networking.interfaces.eth1.ipv4.addresses = lib.mkForce [ ];
|
||||
systemd.network.networks."10-lan" = {
|
||||
matchConfig.Name = "eth1";
|
||||
networkConfig.DHCP = "ipv4";
|
||||
client =
|
||||
{ lib, ... }:
|
||||
{
|
||||
virtualisation.vlans = [ 2 ];
|
||||
networking.useNetworkd = true;
|
||||
networking.useDHCP = false;
|
||||
networking.interfaces.eth1.ipv4.addresses = lib.mkForce [ ];
|
||||
systemd.network.networks."10-lan" = {
|
||||
matchConfig.Name = "eth1";
|
||||
networkConfig.DHCP = "ipv4";
|
||||
# Fixed address inside the delegated /64: the IPv6 pinhole target.
|
||||
address = [ "${clientV6}/64" ];
|
||||
};
|
||||
networking.firewall.enable = false;
|
||||
|
||||
# Every listener echoes the peer address it sees and its own port.
|
||||
services.nginx = {
|
||||
enable = true;
|
||||
virtualHosts.ports = {
|
||||
listen =
|
||||
map
|
||||
(port: {
|
||||
addr = "0.0.0.0";
|
||||
inherit port;
|
||||
})
|
||||
[
|
||||
8080
|
||||
8084
|
||||
9000
|
||||
9001
|
||||
9002
|
||||
8085
|
||||
8086
|
||||
8087
|
||||
]
|
||||
++
|
||||
map
|
||||
(port: {
|
||||
addr = "[::]";
|
||||
inherit port;
|
||||
})
|
||||
[
|
||||
8081
|
||||
8082
|
||||
8080
|
||||
];
|
||||
locations."/".return = ''200 "$remote_addr $server_port"'';
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
# A second LAN host, outside the DHCP pool.
|
||||
peer =
|
||||
{ lib, ... }:
|
||||
{
|
||||
virtualisation.vlans = [ 2 ];
|
||||
networking.useNetworkd = true;
|
||||
networking.useDHCP = false;
|
||||
networking.interfaces.eth1.ipv4.addresses = lib.mkForce [ ];
|
||||
systemd.network.networks."10-lan" = {
|
||||
matchConfig.Name = "eth1";
|
||||
address = [ "${peerV4}/24" ];
|
||||
gateway = [ "192.168.10.1" ];
|
||||
};
|
||||
networking.firewall.enable = false;
|
||||
};
|
||||
networking.firewall.enable = false;
|
||||
};
|
||||
};
|
||||
|
||||
testScript = ''
|
||||
@@ -340,7 +443,7 @@ pkgs.testers.runNixOSTest {
|
||||
with subtest("client autoconfigures a global address from the delegated prefix"):
|
||||
client.wait_until_succeeds("ip -6 addr show dev eth1 scope global | grep -q 2001:db8:2:")
|
||||
client.wait_until_succeeds("ip -6 route show default | grep -q 'dev eth1'")
|
||||
client_v6 = client.succeed("ip -6 -o addr show dev eth1 scope global | awk '{print $4}' | cut -d/ -f1 | head -1").strip()
|
||||
client_v6 = client.succeed("ip -6 -o addr show dev eth1 scope global | awk '{print $4}' | cut -d/ -f1 | grep -v ::1234 | head -1").strip()
|
||||
|
||||
with subtest("IPv6 is routed without NAT"):
|
||||
client.wait_until_succeeds("ping -6 -c 1 -W 2 2001:db8:1::1")
|
||||
@@ -358,5 +461,56 @@ pkgs.testers.runNixOSTest {
|
||||
with subtest("LAN can reach SSH and ping on the router"):
|
||||
client.succeed("nc -z -w 2 192.168.10.1 22")
|
||||
client.succeed("ping -c 1 -W 2 192.168.10.1")
|
||||
|
||||
with subtest("port forward keeps the source address and honours toPort"):
|
||||
for _ in range(3):
|
||||
# Positive control: the listener answers on the LAN.
|
||||
peer.wait_until_succeeds("curl -sf --max-time 5 http://${clientV4}:8080/")
|
||||
out = upstream.succeed("curl -sf --max-time 5 http://${routerV4}:8080/")
|
||||
assert out.strip() == "${ispV4} 8080", out
|
||||
out = upstream.succeed("curl -sf --max-time 5 http://${routerV4}:8083/")
|
||||
assert out.strip() == "${ispV4} 8084", out
|
||||
# The translated port is not exposed directly.
|
||||
upstream.fail("curl -sf --max-time 3 http://${routerV4}:8084/")
|
||||
|
||||
with subtest("port ranges open exactly their ports"):
|
||||
for port in (9000, 9001, 9002):
|
||||
out = upstream.succeed(f"curl -sf --max-time 5 http://${routerV4}:{port}/")
|
||||
assert out.strip() == f"${ispV4} {port}", out
|
||||
upstream.fail("curl -sf --max-time 3 http://${routerV4}:9003/")
|
||||
|
||||
with subtest("source allow-list admits matching clients only"):
|
||||
out = upstream.succeed("curl -sf --max-time 5 http://${routerV4}:8085/")
|
||||
assert out.strip() == "${ispV4} 8085", out
|
||||
upstream.fail("curl -sf --max-time 3 http://${routerV4}:8086/")
|
||||
|
||||
with subtest("per-source rate limit drops excess new connections"):
|
||||
ok = 0
|
||||
for _ in range(12):
|
||||
status, _out = upstream.execute("curl -sf --max-time 2 http://${routerV4}:8087/")
|
||||
ok += status == 0
|
||||
assert 0 < ok < 12, f"expected some but not all connections to pass, got {ok}/12"
|
||||
|
||||
with subtest("IPv6 reaches only the explicit pinholes"):
|
||||
out = upstream.succeed("curl -sf -g --max-time 5 'http://[${clientV6}]:8081/'")
|
||||
assert out.strip() == "2001:db8:1::1 8081", out
|
||||
# The listener exists, but there is no pinhole for it.
|
||||
client.succeed("nc -6 -z -w 2 ${clientV6} 8082")
|
||||
upstream.fail("curl -sf -g --max-time 3 'http://[${clientV6}]:8082/'")
|
||||
# Port 8080 is forwarded for IPv4 only.
|
||||
client.succeed("nc -6 -z -w 2 ${clientV6} 8080")
|
||||
upstream.fail("curl -sf -g --max-time 3 'http://[${clientV6}]:8080/'")
|
||||
|
||||
with subtest("hairpin NAT works for forwards that enable it"):
|
||||
out = peer.succeed("curl -sf --max-time 5 http://${routerV4}:8080/")
|
||||
# Masqueraded: the server sees the router, not the peer.
|
||||
assert out.strip() == "192.168.10.1 8080", out
|
||||
# No hairpin on the range forward: the router does not translate it.
|
||||
peer.fail("curl -sf --max-time 3 http://${routerV4}:9001/")
|
||||
|
||||
with subtest("logging rules leave a trace in the kernel log"):
|
||||
klog = router.succeed("journalctl -k --no-pager | grep 'router fwd#'")
|
||||
assert "accepted: " in klog, klog
|
||||
assert "rate-limited: " in klog, klog
|
||||
'';
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user