heather: replace personal mesh with guarded AstrNet stub
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heather
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4 changed files with 203 additions and 175 deletions
199
hosts/heather/astrnet.nix
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199
hosts/heather/astrnet.nix
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# astrnet.nix — AstrNet stub peer "michaotic". Generated by astrnet-join.sh.
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#
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# What this host is to the mesh: identity 10.0.0.9 / 2a05:f480:2400:1cf7::9,
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# ASN 4200000009, two WireGuard legs that THIS host dials:
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# wg-mic-der -> alderamin (Helsinki) primary, pair 38
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# wg-mic-bd8 -> bd8816 (Moscow) backup, pair 39 (paths come prepended)
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# It announces only its identity and accepts only mesh address space; it
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# never becomes transit and never takes a default route from the mesh.
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#
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# All values are assigned by the AstrNet admin. Do not renumber anything
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# here without them: the far ends are configured to match exactly.
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{ config, lib, pkgs, ... }:
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let
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keyFile = "/var/lib/astrnet/wg.key";
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id4 = "10.0.0.9";
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id6 = "2a05:f480:2400:1cf7::9";
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mkLeg = { listenPort, ips, publicKey, endpoint }: {
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inherit ips listenPort;
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privateKeyFile = keyFile;
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mtu = 1380;
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# Routing is BGP's job. allowedIPs 0/0 only PERMITS any source through
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# the tunnel; with routes off, it installs nothing. Turning routes on
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# would hijack this host's default route.
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allowedIPsAsRoutes = false;
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peers = [{
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inherit publicKey endpoint;
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allowedIPs = [ "0.0.0.0/0" "::/0" ];
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persistentKeepalive = 25;
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}];
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};
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in {
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networking.wireguard.interfaces = {
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# The fe80:: link-locals are required: without one FRR's IPv6 BGP
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# next-hop selection fails and the v6 session never leaves Connect.
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wg-mic-der = mkLeg {
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listenPort = 52038;
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ips = [ "10.99.0.154/30" "fd53:4023:2326:99::9a/126" "fe80::2/64" ];
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publicKey = "a4FyXuoI16TxZxv407lSzJV2YFJdq6FgRAtGu+oMzEY=";
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endpoint = "31.77.105.157:52038";
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};
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wg-mic-bd8 = mkLeg {
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listenPort = 52039;
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ips = [ "10.99.0.158/30" "fd53:4023:2326:99::9e/126" "fe80::2/64" ];
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publicKey = "QIvX+avvJqaHxuksGWb6Hx8fv7R6VI5wpaGqLme6Fgw=";
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endpoint = "195.133.60.217:52039";
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};
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};
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# Heather's public firewall is disabled (the cloud SG is the WAN barrier).
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# Explicitly restrict traffic FROM AstrNet before normal Docker/host rules:
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# BGP from the two expected neighbors, ping to this mesh ID; no transit.
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# Existing outbound sessions may receive established replies.
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systemd.services.astrnet-guard = {
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description = "Restrict AstrNet tunnel ingress";
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wantedBy = [ "multi-user.target" ];
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requiredBy = [ "wireguard-wg-mic-der.service" "wireguard-wg-mic-bd8.service" ];
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before = [ "wireguard-wg-mic-der.service" "wireguard-wg-mic-bd8.service" ];
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path = [ pkgs.nftables ];
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serviceConfig = { Type = "oneshot"; RemainAfterExit = true; };
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script = ''
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nft list table inet astrnet_guard >/dev/null 2>&1 && nft delete table inet astrnet_guard
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nft -f - <<'RULES'
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table inet astrnet_guard {
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chain input {
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type filter hook input priority -150; policy accept;
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iifname { "wg-mic-der", "wg-mic-bd8" } ct state established,related accept
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iifname "wg-mic-der" ip saddr 10.99.0.153 tcp dport 179 accept
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iifname "wg-mic-bd8" ip saddr 10.99.0.157 tcp dport 179 accept
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iifname "wg-mic-der" ip6 saddr fd53:4023:2326:99::99 tcp dport 179 accept
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iifname "wg-mic-bd8" ip6 saddr fd53:4023:2326:99::9d tcp dport 179 accept
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iifname { "wg-mic-der", "wg-mic-bd8" } ip daddr 10.0.0.9 icmp type echo-request accept
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iifname { "wg-mic-der", "wg-mic-bd8" } drop
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}
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chain forward {
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type filter hook forward priority -150; policy accept;
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iifname { "wg-mic-der", "wg-mic-bd8" } drop
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}
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}
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RULES
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'';
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preStop = "nft delete table inet astrnet_guard || true";
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};
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# Mesh identity on a dummy interface. It must exist before FRR installs
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# routes, because those routes are pinned to it as their source address.
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systemd.services.astrnet-mesh0 = {
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description = "AstrNet mesh identity (mesh0)";
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wantedBy = [ "multi-user.target" ];
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before = [ "frr.service" ];
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requiredBy = [ "frr.service" ];
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path = [ pkgs.iproute2 ];
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serviceConfig = { Type = "oneshot"; RemainAfterExit = true; };
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script = ''
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ip link show mesh0 >/dev/null 2>&1 || ip link add mesh0 type dummy
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ip link set mesh0 up
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ip addr replace ${id4}/32 dev mesh0
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ip -6 addr replace ${id6}/128 dev mesh0
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'';
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preStop = "ip link del mesh0 || true";
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};
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# BGP only inside the tunnels, never on the public interface.
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networking.firewall.interfaces."wg-mic-der".allowedTCPPorts = [ 179 ];
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networking.firewall.interfaces."wg-mic-bd8".allowedTCPPorts = [ 179 ];
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# Two legs means replies can arrive on the leg that is not the best route
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# back. Strict reverse-path filtering drops those; loose keeps the spoof
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# check (a route must exist) without caring which leg it points at.
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networking.firewall.checkReversePath = lib.mkDefault "loose";
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networking.networkmanager.unmanaged =
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lib.mkIf config.networking.networkmanager.enable
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[ "interface-name:wg-mic-*" "interface-name:mesh0" ];
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services.frr = {
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bgpd.enable = true;
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config = ''
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ip prefix-list OWN-V4 seq 5 permit ${id4}/32
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ipv6 prefix-list OWN-V6 seq 5 permit ${id6}/128
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!
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! Accept mesh space only: never a default, never public prefixes. The
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! mesh carries anycast /32s for public services (DNS resolvers etc.);
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! accepting those would steer this host's own traffic into AstrNet.
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! It also keeps the tunnel endpoints themselves out of the tunnels.
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! Narrow to AstrNet address space; do not accept Yandex Cloud 10.130/24.
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ip prefix-list MESH-V4 seq 5 permit 10.0.0.0/24 ge 24 le 32
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ip prefix-list MESH-V4 seq 10 permit 10.0.1.0/24 ge 24 le 32
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ip prefix-list MESH-V4 seq 15 permit 10.0.2.0/24 ge 24 le 32
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ip prefix-list MESH-V4 seq 20 permit 10.99.0.0/22 ge 22 le 32
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ipv6 prefix-list MESH-V6 seq 5 permit 2a05:f480:2400:1cf7::/64 le 128
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ipv6 prefix-list MESH-V6 seq 10 permit fd53:4023:2326::/48 le 128
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!
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route-map MESH-IN-V4 permit 10
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match ip address prefix-list MESH-V4
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exit
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route-map MESH-IN-V6 permit 10
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match ipv6 address prefix-list MESH-V6
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exit
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route-map MESH-OUT-V4 permit 10
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match ip address prefix-list OWN-V4
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exit
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route-map MESH-OUT-V6 permit 10
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match ipv6 address prefix-list OWN-V6
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exit
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!
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! Source mesh traffic from the identity, not from whichever tunnel /30
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! it leaves by; otherwise replies break whenever the path changes.
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route-map SET-MESH-SRC permit 10
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set src ${id4}
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exit
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route-map SET-MESH-SRC-V6 permit 10
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set src ${id6}
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exit
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ip protocol bgp route-map SET-MESH-SRC
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ipv6 protocol bgp route-map SET-MESH-SRC-V6
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!
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router bgp 4200000009
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bgp router-id ${id4}
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no bgp ebgp-requires-policy
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no bgp default ipv4-unicast
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bgp bestpath as-path multipath-relax
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neighbor 10.99.0.153 remote-as 4200000012
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neighbor 10.99.0.153 description alderamin-v4-wg-mic-der
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neighbor 10.99.0.153 update-source 10.99.0.154
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neighbor 10.99.0.157 remote-as 4200000005
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neighbor 10.99.0.157 description bd8816-v4-wg-mic-bd8
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neighbor 10.99.0.157 update-source 10.99.0.158
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neighbor fd53:4023:2326:99::99 remote-as 4200000012
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neighbor fd53:4023:2326:99::99 description alderamin-v6-wg-mic-der
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neighbor fd53:4023:2326:99::99 interface wg-mic-der
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neighbor fd53:4023:2326:99::99 update-source fd53:4023:2326:99::9a
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neighbor fd53:4023:2326:99::9d remote-as 4200000005
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neighbor fd53:4023:2326:99::9d description bd8816-v6-wg-mic-bd8
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neighbor fd53:4023:2326:99::9d interface wg-mic-bd8
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neighbor fd53:4023:2326:99::9d update-source fd53:4023:2326:99::9e
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!
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address-family ipv4 unicast
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network ${id4}/32
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neighbor 10.99.0.153 activate
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neighbor 10.99.0.153 route-map MESH-IN-V4 in
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neighbor 10.99.0.153 route-map MESH-OUT-V4 out
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neighbor 10.99.0.157 activate
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neighbor 10.99.0.157 route-map MESH-IN-V4 in
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neighbor 10.99.0.157 route-map MESH-OUT-V4 out
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exit-address-family
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!
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address-family ipv6 unicast
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network ${id6}/128
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neighbor fd53:4023:2326:99::99 activate
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neighbor fd53:4023:2326:99::99 route-map MESH-IN-V6 in
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neighbor fd53:4023:2326:99::99 route-map MESH-OUT-V6 out
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neighbor fd53:4023:2326:99::9d activate
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neighbor fd53:4023:2326:99::9d route-map MESH-IN-V6 in
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neighbor fd53:4023:2326:99::9d route-map MESH-OUT-V6 out
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exit-address-family
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exit
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'';
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};
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}
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