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authorAlex Auvolat <alex@adnab.me>2022-04-19 22:03:58 +0200
committerAlex Auvolat <alex@adnab.me>2022-04-19 22:03:58 +0200
commitdb081fad0e3b3933ca963fae085fd0c5c0764f80 (patch)
treedbd3850beeed0b1b8b53a48f3f19c4a73dc64c59 /nix/wesher_service.nix
parent9ff81afd7ea75c583adaef3a49e9b28b45185d99 (diff)
downloadnixcfg-db081fad0e3b3933ca963fae085fd0c5c0764f80.tar.gz
nixcfg-db081fad0e3b3933ca963fae085fd0c5c0764f80.zip
First working Wesher configuration
Diffstat (limited to 'nix/wesher_service.nix')
-rw-r--r--nix/wesher_service.nix122
1 files changed, 122 insertions, 0 deletions
diff --git a/nix/wesher_service.nix b/nix/wesher_service.nix
new file mode 100644
index 0000000..be33a76
--- /dev/null
+++ b/nix/wesher_service.nix
@@ -0,0 +1,122 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+ cfg = config.services.wesher;
+
+in {
+ options = with types; {
+ services.wesher = {
+ enable = mkEnableOption "wesher wireguard overlay mesh network manager";
+
+ package = mkOption {
+ type = package;
+ default = pkgs.wesher;
+ defaultText = literalExpression "pkgs.wesher";
+ description = "Wesher package to use.";
+ };
+
+ clusterKey = mkOption {
+ type = nullOr str;
+ default = null;
+ description = "shared key for cluster membership; must be 32 bytes base64 encoded; will be generated if not provided";
+ };
+
+ bindAddr = mkOption {
+ type = nullOr str;
+ default = null;
+ description = "IP address to bind to for cluster membership (cannot be used with --bind-iface)";
+ };
+
+ bindIface = mkOption {
+ type = nullOr str;
+ default = null;
+ description = "Interface to bind to for cluster membership (cannot be used with --bind-addr)";
+ };
+
+ join = mkOption {
+ type = listOf str;
+ default = [];
+ description = "list of hostnames or IP addresses to existing cluster members; if not provided, will attempt resuming any known state or otherwise wait for further members";
+ };
+
+ clusterPort = mkOption {
+ type = port;
+ default = 7946;
+ description = "port used for membership gossip traffic (both TCP and UDP); must be the same accross cluster";
+ };
+
+ wireguardPort = mkOption {
+ type = port;
+ default = 51820;
+ description = "port used for wireguard traffic (UDP); must be the same accross cluster";
+ };
+
+ overlayNet = mkOption {
+ type = str;
+ default = "10.0.0.0/8";
+ description = "the network in which to allocate addresses for the overlay mesh network (CIDR format); smaller networks increase the chance of IP collision";
+ };
+
+ interface = mkOption {
+ type = str;
+ default = "wgoverlay";
+ description = "name of the wireguard interface to create and manage";
+ };
+
+ logLevel = mkOption {
+ type = str;
+ default = "warn";
+ description = "set the verbosity (one of debug/info/warn/error)";
+ };
+
+ };
+ };
+
+ config = mkIf cfg.enable (let binWesher = cfg.package + "/bin/wesher";
+ in {
+ systemd.services.wesher = {
+ description = "wesher wireguard overlay mesh network manager";
+ bindsTo = [ "network-online.target" ];
+ after = [ "network-online.target" ];
+ wantedBy = [ "multi-user.target" ];
+
+ environment = {
+ WESHER_JOIN = builtins.concatStringsSep "," cfg.join;
+ WESHER_CLUSTER_PORT = builtins.toString cfg.clusterPort;
+ WESHER_WIREGUARD_PORT = builtins.toString cfg.wireguardPort;
+ WESHER_OVERLAY_NET = cfg.overlayNet;
+ WESHER_INTERFACE = cfg.interface;
+ WESHER_LOG_LEVEL = cfg.logLevel;
+ WESHER_NO_ETC_HOSTS = "true";
+ }
+ // (if (cfg.clusterKey != null) then { WESHER_CLUSTER_KEY = cfg.clusterKey; } else {})
+ // (if (cfg.bindAddr != null) then { WESHER_BIND_ADDR = cfg.bindAddr; } else {})
+ // (if (cfg.bindIface != null) then { WESHER_BIND_IFACE = cfg.bindIface; } else {})
+ ;
+
+ serviceConfig = {
+ ExecStart = "${binWesher}";
+ Restart = "always";
+
+ User = "wesher";
+ DynamicUser = true;
+ StateDirectory = "wesher";
+
+ AmbientCapabilities = "CAP_NET_ADMIN CAP_NET_BIND_SERVICE";
+ CapabilityBoundingSet = "CAP_NET_ADMIN CAP_NET_BIND_SERVICE";
+ MemoryDenyWriteExecute = true;
+ ProtectControlGroups = true;
+ ProtectKernelModules = true;
+ ProtectKernelTunables = true;
+ RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6 AF_NETLINK";
+ RestrictNamespaces = true;
+ RestrictRealtime = true;
+ SystemCallArchitectures = "native";
+ SystemCallFilter = "~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @resources";
+ };
+ };
+
+ networking.firewall.allowedUDPPorts = mkIf cfg.enable [ cfg.clusterPort cfg.wireguardPort ];
+ networking.firewall.allowedTCPPorts = mkIf cfg.enable [ cfg.clusterPort ];
+ });
+}