smtp-forward

1 files changed, 78 insertions, 0 deletions

diff --git a/module.nix b/module.nix
new file mode 100644
index 0000000..85e033d
--- /dev/null
+++ b/module.nix
@@ -0,0 +1,78 @@
+{ config, pkgs, lib, runCommand, ... }:
+let
+  package = pkgs.callPackage ./default.nix {};
+  cfg = config.services.smtp-forward;
+in {
+  options.services.smtp-forward = {
+    enable = lib.mkEnableOption "the smtp-forward service";
+    mapping = lib.mkOption {
+      type = lib.types.str;
+      default = "prefix1:addres@host,prefix2:address@host";
+      description = "-m maps prefixes to email addresses";
+    };
+    listen = lib.mkOption {
+      type = lib.types.str;
+      default = ":25";
+      description = "Adress to listen on";
+    };
+    hostname = lib.mkOption {
+      type = lib.types.str;
+      default = "localhost";
+      description = "-h sets the server hostname";
+    };
+    key = lib.mkOption {
+      type = lib.types.str;
+      default = "setme";
+      description = "-k sets the TLS key";
+    };
+    cert = lib.mkOption {
+      type = lib.types.str;
+      default = "setme";
+      description = "-c sets the TLS key";
+    };
+  };
+  config = lib.mkIf config.services.smtp-forward.enable {
+    systemd.services.smtp-forward = {
+      description = "Run smtp-forward";
+      path = [ package ];
+      wantedBy = [ "default.target" ];
+      script = ''
+        ${package}/bin/smtp-forward -l ${cfg.listen} -m ${cfg.mapping} -h ${cfg.hostname} -k ${cfg.key} -c ${cfg.cert}
+      '';
+      serviceConfig = {
+        User = "smtp-forward";
+	# Security
+      	AmbientCapabilities = [ "CAP_NET_BIND_SERVICE" ];
+      	CapabilityBoundingSet = [ "CAP_NET_BIND_SERVICE" ];
+      	NoNewPrivileges = true;
+        ProtectSystem = "strict";
+        ProtectHome = true;
+        PrivateTmp = true;
+        ProtectUsers = true;
+        ProtectKernelLogs = true;
+        PrivateDevices = true;
+        ProtectHostname = true;
+        ProtectKernelTunables = true;
+        ProtectKernelModules = true;
+        ProtectControlGroups = true;
+        RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
+        RestrictNamespaces = true;
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        PrivateMounts = true;
+        SystemCallArchitectures = "native";
+        ProtectClock = true;
+        SystemCallFilter= [ "~@mount" "~@reboot" "~@swap" "~@module" "~@debug" "~@cpu-emulation" "SystemCallFilter=~@obsolete" ];
+      };
+    };
+
+    users.users.smtp-forward = {
+      description = "smtp-forward user";
+      group = "nogroup";
+      extraGroups = [ "keys" ];
+      uid = config.ids.uids.firebird;
+    };
+  };
+}