make configuration a nixos module

default.nix

@@ -0,0 +1,277 @@
+
+#  nixos-mailserver: a simple mail server
+#  Copyright (C) 2016-2017  Robin Raymond
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program. If not, see <http://www.gnu.org/licenses/>
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.mailserver;
+in
+{
+  options.mailserver = {
+    enable = mkEnableOption "nixos-mailserver";
+
+    domain = mkOption {
+      type = types.str;
+      example = "example.com";
+      description = "The domain that this mail server serves. So far only one domain is supported";
+    };
+
+    host_prefix = mkOption {
+      type = types.str;
+      default = "mail";
+      description = ''
+        The prefix of the FQDN of the server. In this example the FQDN of the server
+        is given by 'mail.example.com'
+      '';
+    };
+
+    login_accounts = mkOption {
+      type = types.loaOf (types.submodule ({ name, ... }: {
+        options = {
+          name = mkOption {
+            type = types.str;
+            example = "user1";
+            description = "Username";
+          };
+
+          hashedPassword = mkOption {
+            type = types.str;
+            example = "$6$evQJs5CFQyPAW09S$Cn99Y8.QjZ2IBnSu4qf1vBxDRWkaIZWOtmu1Ddsm3.H3CFpeVc0JU4llIq8HQXgeatvYhh5O33eWG3TSpjzu6/";
+            description = ''
+              Hashed password. Use `mkpasswd` as follows
+
+              ```
+              mkpasswd -m sha-512 "super secret password"
+              ```
+            '';
+          };
+        };
+
+        config.name = mkDefault name;
+      }));
+      example = {
+        user1 = {
+          hashedPassword = "$6$evQJs5CFQyPAW09S$Cn99Y8.QjZ2IBnSu4qf1vBxDRWkaIZWOtmu1Ddsm3.H3CFpeVc0JU4llIq8HQXgeatvYhh5O33eWG3TSpjzu6/";
+        };
+        user2 = {
+          hashedPassword = "$6$oE0ZNv2n7Vk9gOf$9xcZWCCLGdMflIfuA0vR1Q1Xblw6RZqPrP94mEit2/81/7AKj2bqUai5yPyWE.QYPyv6wLMHZvjw3Rlg7yTCD/";
+        };
+      };
+      description = ''
+        The login account of the domain. Every account is mapped to a unix user,
+        e.g. `user1@example.com`. To generate the passwords use `mkpasswd` as
+        follows
+
+        ```
+        mkpasswd -m sha-512 "super secret password"
+        ```
+      '';
+    };
+
+    valiases = mkOption {
+      type = types.attrsOf (types.enum (builtins.attrNames cfg.login_accounts));
+      example = {
+        info = "user1";
+        postmaster = "user1";
+        abuse = "user1";
+      };
+      description = ''
+        Virtual Aliases. A virtual alias `info = "user1"` means that
+        all mail to `info@example.com` is forwarded to `user1@example.com`. Note
+        that it is expected that `postmaster@example.com` and `abuse@example.com` is
+        forwarded to some valid email address. (Alternatively you can create login
+        accounts for `postmaster` and (or) `abuse`).
+      '';
+    };
+
+    vmail_id_start = mkOption {
+      type = types.int;
+      default = 5000;
+      description = ''
+        The unix UID where the login_accounts are created. 5000 means that the first
+        user will get 5000, the second 5001, ...
+      '';
+    };
+
+    vmail_user_name = mkOption {
+      type = types.str;
+      default = "vmail";
+      description = ''
+        The user name and group name of the user that owns the directory where all
+        the mail is stored.
+      '';
+    };
+
+    vmail_group_name = mkOption {
+      type = types.str;
+      default = "vmail";
+      description = ''
+        The user name and group name of the user that owns the directory where all
+        the mail is stored.
+      '';
+    };
+
+    mail_dir = mkOption {
+      type = types.string;
+      default = "/var/vmail";
+      description = ''
+        Where to store the mail.
+      '';
+    };
+
+    certificate_scheme = mkOption {
+      type = types.enum [ 1 2 ];
+      default = 2;
+      description = ''
+        Certificate Files. There are three options for these.
+
+        1) You specify locations and manually copy certificates there.
+        2) You let the server create new (self signed) certificates on the fly.
+        3) You let the server create a certificate via `Let's Encrypt`. Note that
+           this implies that a stripped down webserver has to be started. This also
+           implies that the FQDN must be set as an `A` record to point to the IP of
+           the server. TODO: Explain more details
+
+        TODO: Only certificate scheme 1) and 2) work as of yet.
+      '';
+    };
+
+    cert_file = mkOption {
+      type = types.path;
+      example = "/root/mail-server.crt";
+      description = ''
+        Scheme 1)
+        Location of the certificate
+      '';
+    };
+
+    key_file = mkOption {
+      type = types.path;
+      example = "/root/mail-server.key";
+      description = ''
+        Scheme 1)
+        Location of the key file
+      '';
+    };
+
+    cert_dir = mkOption {
+      type = types.path;
+      default = "/var/certs";
+      description = ''
+        Sceme 2)
+        This is the folder where the certificate will be created. The name is
+        hardcoded to "cert-<domain>.pem" and "key-<domain>.pem" and the
+        certificate is valid for 10 years.
+      '';
+    };
+
+    enable_imap = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to enable imap / pop3. Both variants are only supported in the
+        (sane) startTLS configuration. (TODO: Allow SSL ports). The ports are
+
+        110 - Pop3
+        143 - IMAP
+        587 - SMTP with login
+      '';
+    };
+
+    enable_pop3 = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to enable POP3. Both variants are only supported in the
+        (sane) startTLS configuration. (TODO: Allow SSL ports). The ports are
+
+        110 - Pop3
+        143 - IMAP
+        587 - SMTP with login
+      '';
+    };
+
+    # imapSsl = mkOption {} #< TODO
+    # pop3Ssl = mkOption {} #< TODO
+
+    virus_scanning = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to activate virus scanning. Note that virus scanning is _very_
+        expensive memory wise.
+      '';
+    };
+
+    dkim_signing = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to activate dkim signing.
+        TODO: Explain how to put signature into domain record
+      '';
+    };
+
+    dkim_selector = mkOption {
+      type = types.string;
+      default = "mail";
+      description = ''
+
+      '';
+    };
+
+    dkim_dir = mkOption {
+      type = types.path;
+      default = "/var/dkim";
+      description = ''
+
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services = import ./mail-server/services.nix {
+      inherit lib;
+      inherit (cfg) mail_dir vmail_user_name vmail_group_name valiases domain
+              enable_imap enable_pop3 virus_scanning dkim_signing dkim_selector
+              dkim_dir certificate_scheme cert_file key_file cert_dir;
+    };
+
+    environment = import ./mail-server/environment.nix {
+      inherit pkgs;
+      inherit (cfg) certificate_scheme;
+    };
+
+    networking = import ./mail-server/networking.nix {
+      inherit (cfg) domain host_prefix enable_imap enable_pop3;
+    };
+
+    systemd = import ./mail-server/systemd.nix {
+      inherit pkgs;
+      inherit (cfg) mail_dir vmail_group_name certificate_scheme cert_dir host_prefix
+              domain dkim_selector dkim_dir;
+    };
+
+    users = import ./mail-server/users.nix {
+      inherit lib;
+      inherit (cfg) vmail_id_start vmail_user_name vmail_group_name domain mail_dir
+              login_accounts;
+    };
+  };
+}

mail-config.nix

@@ -1,161 +0,0 @@
-#  nixos-mailserver: a simple mail server
-#  Copyright (C) 2016-2017  Robin Raymond
-#
-#  This program is free software: you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation, either version 3 of the License, or
-#  (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program. If not, see <http://www.gnu.org/licenses/>
-
-{ config, pkgs, ... }:
-
-let
-
-  #
-  # The domain that this mail server serves. So far only one domain is supported
-  #
-  domain = "example.com";
-
-  #
-  # The prefix of the FQDN of the server. In this example the FQDN of the server
-  # is given by 'mail.example.com'
-  #
-  host_prefix = "mail";
-
-  #
-  # The login account of the domain. Every account is mapped to a unix user,
-  # e.g. `user1@example.com`. To generate the passwords use `mkpasswd` as
-  # follows
-  #
-  # ```
-  # mkpasswd -m sha-512 "super secret password"
-  # ```
-  #
-  login_accounts = [
-    { name = "user1";
-      password = "$6$evQJs5CFQyPAW09S$Cn99Y8.QjZ2IBnSu4qf1vBxDRWkaIZWOtmu1Ddsm3.H3CFpeVc0JU4llIq8HQXgeatvYhh5O33eWG3TSpjzu6/";
-    }
-    { name = "user2";
-      password = "$6$oE0ZNv2n7Vk9gOf$9xcZWCCLGdMflIfuA0vR1Q1Xblw6RZqPrP94mEit2/81/7AKj2bqUai5yPyWE.QYPyv6wLMHZvjw3Rlg7yTCD/";
-    }
-  ];
-
-  #
-  # Virtual Aliases. A virtual alias { from = "info"; to = "user1"; } means that
-  # all mail to `info@example.com` is forwarded to `user1@example.com`. Note
-  # that it is expected that `postmaster@example.com` and `abuse@example.com` is
-  # forwarded to some valid email address. (Alternatively you can create login
-  # accounts for `postmaster` and (or) `abuse`).
-  #
-  valiases = [
-    { from = "info";
-      to = "user1";
-    }
-    { from = "postmaster";
-      to = "user1";
-    }
-    { from = "abuse";
-      to = "user1";
-    }
-  ];
-
-  #
-  # The unix UID where the login_accounts are created. 5000 means that the first
-  # user will get 5000, the second 5001, ...
-  #
-  vmail_id_start = 5000;
-
-  #
-  # The user name and group name of the user that owns the directory where all
-  # the mail is stored.
-  #
-  vmail_user_name = "vmail";
-  vmail_group_name = "vmail";
-
-  #
-  # Where to store the mail.
-  #
-  mail_dir = "/var/vmail";
-
-  #
-  # Certificate Files. There are three options for these.
-  #
-  # 1) You specify locations and manually copy certificates there.
-  # 2) You let the server create new (self signed) certificates on the fly.
-  # 3) You let the server create a certificate via `Let's Encrypt`. Note that
-  #    this implies that a stripped down webserver has to be started. This also
-  #    implies that the FQDN must be set as an `A` record to point to the IP of
-  #    the server. TODO: Explain more details
-  #
-  # TODO: Only certificate scheme 1) and 2) work as of yet.
-  certificate_scheme = 2;
-
-  # Sceme 1)
-  cert_file = "/root/mail-server.crt";
-  key_file = "/root/mail-server.key";
-
-  # Sceme 2)
-  # This is the folder where the certificate will be created. The name is
-  # hardcoded to "cert-${domain}.pem" and "key-${domain}.pem" and the
-  # certificate is valid for 10 years.
-  cert_dir = "/var/certs";
-
-  #
-  # Whether to enable imap / pop3. Both variants are only supported in the
-  # (sane) startTLS configuration. (TODO: Allow SSL ports). The ports are
-  #
-  # 110 - Pop3
-  # 143 - IMAP
-  # 587 - SMTP with login
-  #
-  enable_imap = true;
-  enable_pop3 = false;
-  # imap_ssl = false; #< TODO
-  # pop3_ssl = false; #< TODO
-
-  #
-  # Whether to activate virus scanning. Note that virus scanning is _very_
-  # expensive memory wise.
-  #
-  virus_scanning = false;
-
-  #
-  # Whether to activate dkim signing.
-  # TODO: Explain how to put signature into domain record
-  #
-  dkim_signing = true;
-  dkim_selector = "mail";
-  dkim_dir = "/var/dkim";
-in
-{
-  services = import ./mail-server/services.nix {
-    inherit mail_dir vmail_user_name vmail_group_name valiases domain
-            enable_imap enable_pop3 virus_scanning dkim_signing dkim_selector
-            dkim_dir certificate_scheme cert_file key_file cert_dir;
- };
-
-  environment = import ./mail-server/environment.nix {
-    inherit pkgs certificate_scheme;
-  };
-
-  networking = import ./mail-server/networking.nix {
-    inherit domain host_prefix enable_imap enable_pop3;
-  };
-
-  systemd = import ./mail-server/systemd.nix {
-    inherit mail_dir vmail_group_name certificate_scheme cert_dir host_prefix
-            domain pkgs dkim_selector dkim_dir;
-  };
-
-  users = import ./mail-server/users.nix {
-    inherit vmail_id_start vmail_user_name vmail_group_name domain mail_dir
-            login_accounts;
-  };
-}

mail-server/networking.nix

@@ -17,7 +17,7 @@
 { domain, host_prefix, enable_imap, enable_pop3 }:
 
 {
-  hostName = "${host_prefix}.${domain}";
+  #hostName = "${host_prefix}.${domain}";
 
   firewall = {
     enable = true;

mail-server/postfix.nix

@@ -14,22 +14,18 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ mail_dir, domain, valiases, cert, key }:
+{ lib, mail_dir, domain, valiases, cert, key }:
 
 let
-  # valiasToString :: { from = "..."; to = "..." } -> String
-  valiasToString = x: "${x.from}@${domain} ${x.to}@${domain}\n";
-
   # valiases_postfix :: [ String ]
-  valiases_postfix = map valiasToString valiases;
+  valiases_postfix = map
-
+    (from:
-  # concatString :: [ String ] -> String
+      let to = valiases.${from};
-  concatString = l: if l == []
+      in "${from}@${domain} ${to}@${domain}")
-                    then ""
+    (builtins.attrNames valiases);
-                    else (builtins.head l) + (concatString (builtins.tail l));
 
   # valiases_file :: Path
-  valiases_file = builtins.toFile "valias" (concatString valiases_postfix);
+  valiases_file = builtins.toFile "valias" (lib.concatStringsSep "\n" valiases_postfix);
 
   # vhosts_file :: Path
   vhosts_file = builtins.toFile "vhosts" domain;

mail-server/services.nix

@@ -14,7 +14,7 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ mail_dir, vmail_user_name, vmail_group_name, valiases, domain, enable_imap,
+{ lib, mail_dir, vmail_user_name, vmail_group_name, valiases, domain, enable_imap,
 enable_pop3, virus_scanning, dkim_signing, dkim_selector, dkim_dir,
 certificate_scheme, cert_file, key_file, cert_dir }:
 
@@ -44,7 +44,7 @@ in
   };
 
   postfix = import ./postfix.nix {
-    inherit mail_dir domain valiases cert key;
+    inherit lib mail_dir domain valiases cert key;
   };
 
   dovecot2 = import ./dovecot.nix {

mail-server/users.nix

@@ -14,7 +14,7 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ vmail_id_start, vmail_user_name, vmail_group_name, domain, mail_dir,
+{ lib, vmail_id_start, vmail_user_name, vmail_group_name, domain, mail_dir,
 login_accounts }:
 
 let
@@ -28,15 +28,15 @@ let
   }];
 
   # accountsToUser :: String -> UserRecord
-  accountsToUser = x: {
+  accountsToUser = account: {
-    name = x.name + "@" + domain;
+    name = account.name + "@" + domain;
     isNormalUser = false;
     group = vmail_group_name;
-    hashedPassword = x.password;
+    inherit (account) hashedPassword;
   };
 
   # mail_user :: [ UserRecord ]
-  mail_user = map accountsToUser login_accounts;
+  mail_user = map accountsToUser (lib.attrValues login_accounts);
 
 in
 {