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router: wireguard->openvpn via ssh

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This commit is contained in:
chayleaf 2024-06-05 19:35:01 +07:00
parent b41ca57cb3
commit 2b61423e72
Signed by: chayleaf
GPG key ID: 78171AD46227E68E
2 changed files with 90 additions and 21 deletions
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75
system/hosts/router/default.nix
View file

@ -49,7 +49,12 @@ let
# vpn table, assign an id but don't actually add a rule for it, so it is the default
vpn_table = 2;
vpn_mtu = config.networking.wireguard.interfaces.wg0.mtu;
vpn_iface =
if cfg.vpn.openvpn.enable && !cfg.vpn.wireguard.enable then "tun0"
else if cfg.vpn.wireguard.enable && !cfg.vpn.openvpn.enable then "wg0"
else throw "Exactly one of OpenVPN/Wireguard must be used";
vpn_mtu = config.networking.wireguard.interfaces.${vpn_iface}.mtu or 1320;
vpn_ipv4_mss = vpn_mtu - 40;
vpn_ipv6_mss = vpn_mtu - 60;
@ -411,7 +416,8 @@ in {
# ethernet wan
router.interfaces.wan = {
dependentServices = [
{ service = "wireguard-wg0"; inNetns = false; }
(lib.mkIf cfg.vpn.wireguard.enable { service = "wireguard-${vpn_iface}"; inNetns = false; })
(lib.mkIf cfg.vpn.openvpn.enable { service = "openvpn-client"; inNetns = false; })
{ service = "wireguard-wg1"; inNetns = false; }
];
systemdLink.linkConfig.MACAddressPolicy = "none";
@ -503,12 +509,12 @@ in {
selfIp4 = netAddresses.lan4;
selfIp6 = netAddresses.lan6;
lans = [ "br0" "wg1" ];
wans = [ "wg0" "veth-wan-a" ];
wans = [ vpn_iface "veth-wan-a" ];
logPrefix = "lan ";
netdevIngressWanRules = with notnft.dsl; with payload; [
# check oif only from vpn
# dont check it from veth-wan-a because of dnat fuckery and because we already check packets coming from wan there
[(is.eq meta.iifname (set [ "wg0" "wg1" ])) (is.eq (fib (f: with f; [ saddr mark iif ]) (f: f.oif)) missing) (log "lan oif missing ") drop]
[(is.eq meta.iifname (set [ vpn_iface "wg1" ])) (is.eq (fib (f: with f; [ saddr mark iif ]) (f: f.oif)) missing) (log "lan oif missing ") drop]
];
inetDnatRules =
builtins.concatLists (map
@ -517,10 +523,10 @@ in {
rule4 = rule.target4; rule6 = rule.target6;
in with notnft.dsl; with payload;
lib.optional (rule4 != null)
[ (is.eq meta.iifname "wg0") (is.eq ip.protocol protocols) (is.eq th.dport rule.port)
[ (is.eq meta.iifname vpn_iface) (is.eq ip.protocol protocols) (is.eq th.dport rule.port)
(if rule4.port == null then dnat.ip rule4.address else dnat.ip rule4.address rule4.port) ]
++ lib.optional (rule6 != null)
[ (is.eq meta.iifname "wg0") (is.eq ip6.nexthdr protocols) (is.eq th.dport rule.port)
[ (is.eq meta.iifname vpn_iface) (is.eq ip6.nexthdr protocols) (is.eq th.dport rule.port)
(if rule6.port == null then dnat.ip6 rule6.address else dnat.ip6 rule6.address rule6.port) ]
)
(builtins.filter (x: x.inVpn && (x.tcp || x.udp)) cfg.dnatRules))
@ -574,13 +580,14 @@ in {
[(is.eq ip6.daddr "@block6") (log "block6 ") drop]
[(is.eq ip.saddr "@block4") (log "block4/s ") drop]
[(is.eq ip6.saddr "@block6") (log "block6/s ") drop]
[(mangle meta.mark wan_table)]
# default to vpn...
[(mangle meta.mark vpn_table)]
# [(mangle meta.mark vpn_table)]
# ...but unvpn traffic to/from force_unvpn4/force_unvpn6
[(is.eq ip.daddr "@force_unvpn4") (mangle meta.mark wan_table)]
[(is.eq ip6.daddr "@force_unvpn6") (mangle meta.mark wan_table)]
[(is.eq ip.saddr "@force_unvpn4") (mangle meta.mark wan_table)]
[(is.eq ip6.saddr "@force_unvpn6") (mangle meta.mark wan_table)]
# [(is.eq ip.daddr "@force_unvpn4") (mangle meta.mark wan_table)]
# [(is.eq ip6.daddr "@force_unvpn6") (mangle meta.mark wan_table)]
# [(is.eq ip.saddr "@force_unvpn4") (mangle meta.mark wan_table)]
# [(is.eq ip6.saddr "@force_unvpn6") (mangle meta.mark wan_table)]
# ...force vpn to/from force_vpn4/force_vpn6
# (disable this if it breaks some sites)
[(is.eq ip.daddr "@force_vpn4") (mangle meta.mark vpn_table)]
@ -619,12 +626,12 @@ in {
lib.optionals (rule4 != null) [
[ (is.eq meta.iifname lanSet) (is.eq ip.protocol protocols) (is.eq ip.saddr rule4.address)
(is.eq th.sport (if rule4.port != null then rule4.port else rule.port)) (mangle meta.mark vpn_table) ]
[ (is.eq meta.iifname "wg0") (is.eq ip.protocol protocols) (is.eq ip.daddr rule4.address)
[ (is.eq meta.iifname vpn_iface) (is.eq ip.protocol protocols) (is.eq ip.daddr rule4.address)
(is.eq th.dport (if rule4.port != null then rule4.port else rule.port)) (mangle meta.mark vpn_table) ]
] ++ lib.optionals (rule6 != null) [
[ (is.eq meta.iifname lanSet) (is.eq ip6.nexthdr protocols) (is.eq ip6.saddr rule6.address)
(is.eq th.sport (if rule6.port != null then rule6.port else rule.port)) (mangle meta.mark vpn_table) ]
[ (is.eq meta.iifname "wg0") (is.eq ip6.nexthdr protocols) (is.eq ip6.daddr rule6.address)
[ (is.eq meta.iifname vpn_iface) (is.eq ip6.nexthdr protocols) (is.eq ip6.daddr rule6.address)
(is.eq th.dport (if rule6.port != null then rule6.port else rule.port)) (mangle meta.mark vpn_table) ]
])
(builtins.filter (x: x.inVpn && (x.tcp || x.udp) && dnatRuleMode x == "mark") cfg.dnatRules))
@ -756,9 +763,43 @@ in {
# vpn socket is in wan namespace, meaning traffic gets sent through the wan namespace
# vpn interface is in default namespace, meaning it can be used in the default namespace
networking.wireguard.interfaces.wg0 = cfg.wireguard // {
socketNamespace = "wan";
interfaceNamespace = "init";
# networking.wireguard.interfaces.${vpn_iface} = cfg.vpn.wireguard.config // {
# socketNamespace = "wan";
# interfaceNamespace = "init";
# };
systemd.services.vpn-tunnel = {
description = "VPN Tunnel";
wantedBy = [
"multi-user.target"
(lib.mkIf cfg.vpn.openvpn.enable "openvpn-client.service")
(lib.mkIf cfg.vpn.wireguard.enable "wireguard-${vpn_iface}.service")
];
after = [ "network.target" "netns-wan.service" ];
bindsTo = [ "netns-wan.service" ];
stopIfChanged = false;
path = [ config.programs.ssh.package ];
script = ''
while true; do
${config.programs.ssh.package}/bin/ssh \
-i /secrets/vpn/sshtunnel.key \
-L ${netAddresses.netnsWan4}:${toString cfg.vpn.tunnel.localPort}:127.0.0.1:${toString cfg.vpn.tunnel.remotePort} \
-p ${toString cfg.vpn.tunnel.port} \
-N -T -v \
sshtunnel@${cfg.vpn.tunnel.ip}
echo "Restarting..."
sleep 10
done
'';
serviceConfig = {
Restart = "always";
Type = "simple";
NetworkNamespacePath = "/var/run/netns/wan";
};
};
services.openvpn.servers = lib.mkIf cfg.vpn.openvpn.enable {
client.config = cfg.vpn.openvpn.config;
};
# use main netns's address instead of 127.0.0.1
@ -847,6 +888,7 @@ in {
wants = [ "nftables-default.service" "avahi-daemon.service" ];
# allow it to call nft
serviceConfig.AmbientCapabilities = [ "CAP_NET_ADMIN" ];
serviceConfig.CapabilityBoundingSet = [ "CAP_NET_ADMIN" ];
};
systemd.services.update-rkn-blacklist = {
# fetch vpn_ips.json and vpn_domains.json for unbound
@ -864,7 +906,6 @@ in {
systemd.timers.update-rkn-blacklist = {
wantedBy = [ "timers.target" ];
partOf = [ "update-rkn-blacklist.service" ];
# slightly unusual time to reduce server load
timerConfig.OnCalendar = [ "*-*-* 00:00:00" ]; # every day
timerConfig.RandomizedDelaySec = 43200; # execute at random time in the first 12 hours
};

36
system/hosts/router/options.nix
View file

@ -5,6 +5,38 @@
{
options.router-settings = {
vpn = {
tunnel = {
enable = lib.mkEnableOption "VPN tunnel";
localPort = lib.mkOption {
description = "local port";
type = lib.types.port;
};
remotePort = lib.mkOption {
description = "remote port";
type = lib.types.port;
};
ip = lib.mkOption {
description = "remote ip";
type = router-lib.types.ipv4;
};
port = lib.mkOption {
description = "SSH port";
type = lib.types.port;
default = 22;
};
};
openvpn.enable = lib.mkEnableOption "OpenVPN";
openvpn.config = lib.mkOption {
description = "OpenVPN config";
type = lib.types.lines;
};
wireguard.enable = lib.mkEnableOption "Wireguard";
wireguard.config = lib.mkOption {
description = "wireguard config";
type = lib.types.attrs;
};
};
routerMac = lib.mkOption {
description = "router's mac address";
type = lib.types.str;
@ -82,10 +114,6 @@
description = "wlan passphrase";
type = lib.types.str;
};
wireguard = lib.mkOption {
description = "wireguard config";
type = lib.types.attrs;
};
dhcpReservations = lib.mkOption {
description = "dhcp reservations (ipv4)";
default = [ ];