servers/losurdo/networking.nix

   1 { pkgs, lib, config, nodes, ... }:
   2 with builtins;
   3 let
   4   inherit (builtins.extraBuiltins) pass-to-file;
   5   inherit (config) networking users;
   6   lanIPv4        = "192.168.1.215";
   7   lanNet         = "192.168.1.0/24";
   8   lanIPv4Gateway = "192.168.1.1";
   9 in
  10 {
  11 imports = [
  12   networking/nftables.nix
  13 ];
  14 boot.initrd.network = {
  15   enable = true;
  16   ssh = {
  17     enable = true;
  18     # To prevent ssh from freaking out because a different host key is used,
  19     # a different port for dropbear is useful
  20     # (assuming the same host has also a normal sshd running)
  21     port = 2222;
  22     # The initrd needs a cleartext key and is built on the host,
  23     # hence this key needs to be cleartext on the host.
  24     # Moreover building the initrd means that the key will go into the Nix store,
  25     # of the host, then of the target on deployment,
  26     # because GRUB does not support boot.initrd.secrets
  27     # (only systemd-boot does, but sticking to GRUB is more reassuring).
  28     # In any case, the initrd is sent to a non-encrypted /boot partition
  29     # to be able to start unattended, hence the key will be available
  30     # to anyone who has physically access to the disk where /boot is.
  31     hostKeys = [
  32       (pass-to-file "servers/losurdo/ssh/ecdsa.key"
  33                     (../../../sec + "/tmp/losurdo.ecdsa.key"))
  34     ];
  35
  36     authorizedKeys = users.users.root.openssh.authorizedKeys.keys;
  37   };
  38   # This will automatically load the zfs password prompt on login
  39   # and kill the other prompt so boot can continue
  40   # The pkill zfs kills the zfs load-key from the console
  41   # allowing the boot to continue.
  42   postCommands = ''
  43     echo >>/root/.profile "zfs load-key -a && pkill zfs"
  44   '';
  45 };
  46
  47 /* WARNING: using ipconfig (the ip= kernel parameter) IS NOT RELIABLE:
  48    a 91.216.110.35/32 becomes a 91.216.110.35/8
  49 boot.kernelParams = map
  50   (ip: "ip=${ip.clientIP}:${ip.serverIP}:${ip.gatewayIP}:${ip.netmask}:${ip.hostname}:${ip.device}:${ip.autoconf}")
  51   [ { clientIP = netIPv4; serverIP = "";
  52       gatewayIP = networking.defaultGateway.address;
  53       netmask = "255.255.255.255";
  54       hostname = ""; device = networking.defaultGateway.interface;
  55       autoconf = "off";
  56     }
  57     { clientIP = lanIPv4; serverIP = "";
  58       gatewayIP = "";
  59       netmask = "255.255.255.0";
  60       hostname = ""; device = "enp2s0";
  61       autoconf = "off";
  62     }
  63   ];
  64 */
  65 /* DIY network config, but a right one */
  66 boot.initrd.preLVMCommands = ''
  67   set -x
  68
  69   # IPv4 lan
  70   ip link set enp5s0 up
  71   ip address add ${lanIPv4}/32 dev enp5s0
  72   ip route add ${lanIPv4Gateway} dev enp5s0
  73   ip route add ${lanNet} dev enp5s0 src ${lanIPv4} proto kernel
  74     # NOTE: ${lanIPv4}/24 would not work with initrd's ip, hence ${lanNet}
  75   ip route add default via ${lanIPv4Gateway} dev enp5s0
  76
  77   # IPv6 net
  78   #ip -6 address add ''${lanIPv6} dev enp5s0
  79   #ip -6 route add ''${lanIPv6Gateway} dev enp5s0
  80   #ip -6 route add default via ''${lanIPv6Gateway} dev enp5s0
  81
  82   ip -4 address
  83   ip -4 route
  84   #ip -6 address
  85   #ip -6 route
  86
  87   set +x
  88
  89   # Since boot.initrd.network's preLVMCommands won't set hasNetwork=1
  90   # we have to run the postCommands ourselves.
  91   ${config.boot.initrd.network.postCommands}
  92 '';
  93 # Workaround https://github.com/NixOS/nixpkgs/issues/56822
  94 #boot.initrd.kernelModules = [ "ipv6" ];
  95
  96 # Useless without an out-of-band access, and unsecure
  97 # (though / may still be encrypted at this point).
  98 # boot.kernelParams = [ "boot.shell_on_fail" ];
  99
 100 # Disable IPv6 entirely until it's available
 101 boot.kernel.sysctl = {
 102   "net.ipv6.conf.enp5s0.disable_ipv6" = 1;
 103 };
 104
 105 networking = rec {
 106   hostName   = "losurdo";
 107   domainBase = "sourcephile";
 108   domain     = "${domainBase}.fr";
 109
 110   useDHCP = false;
 111   defaultGateway = {
 112     address = lanIPv4Gateway;
 113     interface = "enp5s0";
 114   };
 115   /*
 116   defaultGateway6 = {
 117     address = lanIPv6Gateway;
 118     interface = "enp5s0";
 119   };
 120   */
 121   #nameservers = [ ];
 122   nftables.ruleset = ''
 123     add rule inet filter input  iifname "enp5s0" goto net2fw
 124     add rule inet filter output oifname "enp5s0" goto fw2net
 125     add rule inet filter fw2net ip daddr ${lanNet} counter accept comment "LAN"
 126     add rule inet filter fw2net ip daddr 224.0.0.0/4 udp dport 1900 counter accept comment "UPnP"
 127   '';
 128   interfaces.enp5s0 = {
 129     useDHCP = false;
 130     ipv4.addresses = [ { address = lanIPv4; prefixLength = 24; } ];
 131     ipv4.routes    = [ { address = networking.defaultGateway.address; prefixLength = 32; } ];
 132
 133     /*
 134     ipv6.addresses = [ { address = lanIPv6; prefixLength = 64; }
 135                        { address = "fe80::1"; prefixLength = 10; }
 136                      ];
 137     ipv6.routes    = [ { address = networking.defaultGateway6.address; prefixLength = 64; } ];
 138     */
 139   };
 140   interfaces.wlp4s0 = {
 141     useDHCP = false;
 142   };
 143 };
 144 }