vpn-gw: init

config/net/core.nix

@@ -69,6 +69,7 @@
       upstream3 = "172.20.72.11";
       upstream4 = "172.20.72.12";
       yggdrasil = "172.20.72.62";
+      vpn-gw = "172.20.72.69";
     };
     hosts6 = {
       dn42 = {
@@ -130,6 +131,7 @@
         upstream3 = "fd23:42:c3d2:581::b:2";
         upstream4 = "fd23:42:c3d2:581::b:3";
         yggdrasil = "fd23:42:c3d2:581:9000::1";
+        vpn-gw = "fd23:42:c3d2:581:9001::1";
       };
       up4 = {
         anon1 = "2a00:8180:2c00:281::9:1";
@@ -188,6 +190,7 @@
         upstream1 = "2a00:8180:2c00:281::b:0";
         upstream4 = "2a00:8180:2c00:281::b:1";
         yggdrasil = "2a00:8180:2c00:281:9000::1";
+        vpn-gw = "2a00:8180:2c00:281:9001::1";
       };
     };
     subnet4 = "172.20.72.0/25";

config/net/upstream.nix

@@ -393,6 +393,12 @@ in
           reflect = true;
           sourcePort = 1337;
         }
+        {
+          destination = config.site.net.core.hosts4.vpn-gw;
+          proto = "udp";
+          reflect = true;
+          sourcePort = config.site.vpn.wireguard.port;
+        }
       ];
       interfaces = {
         core = {

config/net/vpn.nix

@@ -0,0 +1,39 @@
+{ config, ... }:
+{
+  site.net.vpn = {
+    vlan = null;
+    domainName = "core.zentralwerk.org";
+    hosts4 = {
+      vpn-gw = "172.20.76.225";
+    };
+    hosts6 = {
+      dn42 = {
+        vpn-gw = "fd23:42:c3d2:585::1";
+      };
+      up4 = {
+        vpn-gw = "2a00:8180:2c00:285::1";
+      };
+    };
+    subnet4 = "172.20.76.224/28";
+    subnets6 = {
+      dn42 = "fd23:42:c3d2:585::/64";
+      up4 = "2a00:8180:2c00:285::/64";
+    };
+  };
+
+  site.hosts.vpn-gw = {
+    role = "container";
+    interfaces = {
+      core = {
+        hwaddr = "0A:14:42:01:26:01";
+        type = "veth";
+      };
+      vpn = {
+        type = "wireguard";
+      };
+    };
+    ospf = {
+      allowedUpstreams = [ "upstream4" ];
+    };
+  };
+}

config/secrets-production.nix.gpg

@@ -1,62 +1,66 @@
 -----BEGIN PGP MESSAGE-----
 
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+=zbiO
 -----END PGP MESSAGE-----

config/secrets.nix

@@ -252,4 +252,17 @@
   };
 
   site.dyndnsKey = "SECRET";
+
+  site.vpn.wireguard = {
+    privateKey = "wPNXY4ED3Jz3Kz0KOmvfQOou6/wHrgqSsykaMYrtb28=";
+    peers = [ {
+      # privateKey: GOdfeizQZjPmyYnh3LMI3LrYeEtqYMyOvK8KASVgI1Q=
+      publicKey = "4aTjdm/APMTERczvtnLXRFYjSWYsmwPFTumjyno4nx4=";
+      allowedIPs = [
+        "172.20.76.226"
+        "fd23:42:c3d2:585::/64"
+        "2a00:8180:2c00:285::/64"
+      ];
+    } ];
+  };
 }

nix/lib/config/options.nix

@@ -529,6 +529,30 @@ let
       };
     };
   };
+
+  vpnOpts = {
+    privateKey = mkOption {
+      type = types.str;
+    };
+
+    port = mkOption {
+      type = types.int;
+      default = 1337;
+    };
+
+    peers = mkOption {
+      type = with types; listOf (submodule {
+        options = {
+          publicKey = mkOption {
+            type = str;
+          };
+          allowedIPs = mkOption {
+            type = listOf str;
+          };
+        };
+      });
+    };
+  };
 in
 {
   options.site = {
@@ -551,6 +575,8 @@ in
     dyndnsKey = mkOption {
       type = types.str;
     };
+
+    vpn.wireguard = vpnOpts;
   };
 
   config.warnings =
@@ -585,7 +611,7 @@ in
              else []
         ) (builtins.attrNames config.site.hosts);
     in
-      (reportCollisions "VLAN tag" (x: [x.vlan]) config.site.net) ++
+      (reportCollisions "VLAN tag" (x: lib.optional (x.vlan != null) x.vlan) config.site.net) ++
       (reportCollisions "IPv4 subnet" (x: if x.subnet4 == null then [] else [x.subnet4]) config.site.net) ++
       (reportCollisions "IPv6 subnet" (x: builtins.attrValues x.subnets6) config.site.net) ++
       ospfUpstreamXorGw;

nix/nixos-module/container/vpn.nix

@@ -0,0 +1,51 @@
+{ hostName, config, lib, pkgs, ... }:
+
+let
+  privateKeyFile = ifName:
+    "/run/wireguard-keys/${ifName}.key";
+  ifName = "vpn";
+in
+{
+  systemd.services = {
+    "wireguard-key-${ifName}" = {
+      description = "Create key file for wireguard interface '${ifName}'";
+      requiredBy = [ "systemd-networkd.service" ];
+      before = [ "systemd-networkd.service" ];
+      serviceConfig.Type = "oneshot";
+      script = ''
+        #! ${pkgs.runtimeShell} -e
+
+        F=${privateKeyFile ifName}
+        mkdir -p -m 0700 $(dirname $F)
+        chown systemd-network:systemd-network $(dirname $F)
+        rm -f $F
+        cat >$F <<EOF
+        ${config.site.vpn.wireguard.privateKey}
+        EOF
+        chmod 0400 $F
+        chown systemd-network:systemd-network $F
+      '';
+    };
+  };
+
+  systemd.network.netdevs.vpn = {
+    netdevConfig = {
+      Name = ifName;
+      Kind = "wireguard";
+    };
+    wireguardConfig = {
+      PrivateKeyFile = privateKeyFile ifName;
+      ListenPort = config.site.vpn.wireguard.port;
+    };
+    wireguardPeers = map ({ publicKey, allowedIPs }: {
+      wireguardPeerConfig = {
+        PublicKey = publicKey;
+        AllowedIPs = allowedIPs;
+      };
+    }) config.site.vpn.wireguard.peers;
+  };
+
+  environment.systemPackages = [
+    pkgs.wireguard-tools
+  ];
+}

nix/nixos-module/default.nix

@@ -39,5 +39,8 @@ in {
   ] ++
   optionals (hostName == "netboot") [
     ./container/netboot.nix
+  ] ++
+  optionals (hostName == "vpn-gw") [
+    ./container/vpn.nix
   ];
 }