Merge branch 'module-rewrite'

default.nix

@@ -0,0 +1,260 @@
+
+#  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";
+    };
+
+    hostPrefix = 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'
+      '';
+    };
+
+    loginAccounts = 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"
+        ```
+      '';
+      default = {};
+    };
+
+    virtualAliases = mkOption {
+      type = types.attrsOf (types.enum (builtins.attrNames cfg.loginAccounts));
+      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`).
+      '';
+      default = {};
+    };
+
+    vmailUIDStart = mkOption {
+      type = types.int;
+      default = 5000;
+      description = ''
+        The unix UID where the loginAccounts are created. 5000 means that the first
+        user will get 5000, the second 5001, ...
+      '';
+    };
+
+    vmailUserName = 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.
+      '';
+    };
+
+    vmailGroupName = 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.
+      '';
+    };
+
+    mailDirectory = mkOption {
+      type = types.string;
+      default = "/var/vmail";
+      description = ''
+        Where to store the mail.
+      '';
+    };
+
+    certificateScheme = 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.
+      '';
+    };
+
+    certificateFile = mkOption {
+      type = types.path;
+      example = "/root/mail-server.crt";
+      description = ''
+        Scheme 1)
+        Location of the certificate
+      '';
+    };
+
+    keyFile = mkOption {
+      type = types.path;
+      example = "/root/mail-server.key";
+      description = ''
+        Scheme 1)
+        Location of the key file
+      '';
+    };
+
+    certificateDirectory = 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.
+      '';
+    };
+
+    enableImap = 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
+      '';
+    };
+
+    enablePop3 = 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
+
+    virusScanning = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to activate virus scanning. Note that virus scanning is _very_
+        expensive memory wise.
+      '';
+    };
+
+    dkimSigning = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to activate dkim signing.
+        TODO: Explain how to put signature into domain record
+      '';
+    };
+
+    dkimSelector = mkOption {
+      type = types.string;
+      default = "mail";
+      description = ''
+
+      '';
+    };
+
+    dkimKeyDirectory = mkOption {
+      type = types.path;
+      default = "/var/dkim";
+      description = ''
+
+      '';
+    };
+  };
+
+  imports = [
+    ./mail-server/clamav.nix
+    ./mail-server/users.nix
+    ./mail-server/environment.nix
+    ./mail-server/networking.nix
+    ./mail-server/systemd.nix
+    ./mail-server/dovecot.nix
+    ./mail-server/postfix.nix
+    ./mail-server/rmilter.nix
+  ];
+}

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/clamav.nix

@@ -14,10 +14,15 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ virus_scanning }:
+{ config, pkgs, lib, ... }:
 
+let
+  cfg = config.mailserver;
+in
 {
-  daemon.enable = virus_scanning;
+  config = lib.mkIf cfg.virusScanning {
-  updater.enable = virus_scanning;
+    services.clamav.daemon.enable = true;
+    services.clamav.updater.enable = true;
+  };
 }
 

mail-server/common.nix

@@ -0,0 +1,36 @@
+#  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 }:
+
+let
+  cfg = config.mailserver;
+in
+{
+  # cert :: PATH
+  certificatePath = if cfg.certificateScheme == 1
+             then cfg.certificateFile
+             else if cfg.certificateScheme == 2
+                  then "${cfg.certificateDirectory}/cert-${cfg.domain}.pem"
+                  else "";
+
+  # key :: PATH
+  keyPath = if cfg.certificateScheme == 1
+        then cfg.keyFile
+        else if cfg.certificateScheme == 2
+             then "${cfg.certificateDirectory}/key-${cfg.domain}.pem"
+             else "";
+}

mail-server/dovecot.nix

@@ -14,27 +14,32 @@
 #  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_group_name, vmail_user_name, mail_dir, enable_imap, enable_pop3, cert,
+{ config, pkgs, lib, ... }:
-key }:
+
+with (import ./common.nix { inherit config; });
 
 let
+  cfg = config.mailserver;
+
   # maildir in format "/${domain}/${user}/"
-  dovecot_maildir = "maildir:${mail_dir}/%d/%n/";
+  dovecot_maildir = "maildir:${cfg.mailDirectory}/%d/%n/";
 
 in
 {
+  config = with cfg; lib.mkIf enable {
+    services.dovecot2 = {
       enable = true;
-  enableImap = enable_imap;
+      enableImap = enableImap;
-  enablePop3 = enable_pop3;
+      enablePop3 = enablePop3;
-  mailGroup = vmail_group_name;
+      mailGroup = vmailGroupName;
-  mailUser = vmail_user_name;
+      mailUser = vmailUserName;
       mailLocation = dovecot_maildir;
-  sslServerCert = cert;
+      sslServerCert = certificatePath;
-  sslServerKey = key;
+      sslServerKey = keyPath;
       enableLmtp = true;
       extraConfig = ''
         #Extra Config
-    mail_access_groups = ${vmail_group_name}
+        mail_access_groups = ${vmailGroupName}
         ssl = required
 
         service lmtp {
@@ -83,4 +88,6 @@ in
         }
         }
       '';
+    };
+  };
 }

mail-server/environment.nix

@@ -14,10 +14,15 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ pkgs, certificate_scheme }:
+{ config, pkgs, lib, ... }:
 
+let
+  cfg = config.mailserver;
+in
 {
-  systemPackages = with pkgs; [
+  config = with cfg; lib.mkIf enable {
+    environment.systemPackages = with pkgs; [
       dovecot opendkim openssh postfix clamav rspamd rmilter
-  ] ++ (if certificate_scheme == 2 then [ openssl ] else []);
+    ] ++ (if certificateScheme == 2 then [ openssl ] else []);
+  };
 }

mail-server/networking.nix

@@ -14,14 +14,20 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ domain, host_prefix, enable_imap, enable_pop3 }:
+{ config, pkgs, lib, ... }:
 
+let
+  cfg = config.mailserver;
+in
 {
-  hostName = "${host_prefix}.${domain}";
+  config = with cfg; lib.mkIf enable {
 
-  firewall = {
+    networking.hostName = "${hostPrefix}.${domain}";
+
+    networking.firewall = {
       allowedTCPPorts = [ 25 587 ]
-      ++ (if enable_imap then [ 143 ] else [])
+        ++ (if enableImap then [ 143 ] else [])
-      ++ (if enable_pop3 then [ 110 ] else []);
+        ++ (if enablePop3 then [ 110 ] else []);
+    };
   };
 }

mail-server/postfix.nix

@@ -14,25 +14,25 @@
 #  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 }:
+{ config, pkgs, lib, ... }:
+
+with (import ./common.nix { inherit config; });
 
 let
-  # valiasToString :: { from = "..."; to = "..." } -> String
+  cfg = config.mailserver;
-  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 = cfg.virtualAliases.${from};
-  concatString = l: if l == []
+      in "${from}@${cfg.domain} ${to}@${cfg.domain}")
-                    then ""
+    (builtins.attrNames cfg.virtualAliases);
-                    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;
+  vhosts_file = builtins.toFile "vhosts" cfg.domain;
 
   # vaccounts_file :: Path
   # see
@@ -43,17 +43,19 @@ let
 
 in
 {
+  config = with cfg; lib.mkIf enable {
+
+    services.postfix = {
       enable = true;
       networksStyle = "host";
       mapFiles."valias" = valiases_file;
       mapFiles."vaccounts" = vaccounts_file; 
-  sslCert = cert;
+      sslCert = certificatePath;
-  sslKey = key;
+      sslKey = keyPath;
       enableSubmission = true;
 
       extraConfig = 
       ''
-
       # Extra Config
 
         smtpd_banner = $myhostname ESMTP NO UCE
@@ -64,7 +66,7 @@ in
         # virtual mail system
         virtual_uid_maps = static:5000
         virtual_gid_maps = static:5000
-    virtual_mailbox_base = ${mail_dir}
+        virtual_mailbox_base = ${mailDirectory}
         virtual_mailbox_domains = ${vhosts_file}
         virtual_alias_maps = hash:/var/lib/postfix/conf/valias
         virtual_transport = lmtp:unix:private/dovecot-lmtp
@@ -89,4 +91,6 @@ in
         smtpd_sender_restrictions = "reject_sender_login_mismatch";
         smtpd_recipient_restrictions = "reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject";
       };
+    };
+  };
 }

mail-server/rmilter.nix

@@ -14,10 +14,12 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ domain, virus_scanning, dkim_signing, dkim_dir, dkim_selector }:
+{ config, pkgs, lib, ... }:
 
 let
-  clamav = if virus_scanning
+  cfg = config.mailserver;
+
+  clamav = if cfg.virusScanning
            then
            ''
              clamav {
@@ -25,14 +27,14 @@ let
              };
            ''
            else "";
-  dkim = if dkim_signing
+  dkim = if cfg.dkimSigning
          then
          ''
             dkim {
               domain {
-                key = "${dkim_dir}";
+                key = "${cfg.dkimKeyDirectory}";
                 domain = "*";
-                selector = "${dkim_selector}";
+                selector = "${cfg.dkimSelector}";
               };
               sign_alg = sha256;
               auth_only = yes;
@@ -41,8 +43,10 @@ let
          else "";
 in
 {
+  config = with cfg; lib.mkIf enable {
+    services.rmilter = {
       enable = true;
-  # debug = true;
+      #debug = true;
       postfix.enable = true;
       rspamd.enable = true;
       extraConfig =
@@ -51,5 +55,7 @@ in
 
       ${dkim}
       '';
+    };
+  };
 }
 

mail-server/services.nix

@@ -14,45 +14,31 @@
 #  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,
+
-enable_pop3, virus_scanning, dkim_signing, dkim_selector, dkim_dir,
+{ config, pkgs, lib, ... }:
-certificate_scheme, cert_file, key_file, cert_dir }:
 
 let
+  cfg = config.mailserver;
+
   # cert :: PATH
-  cert = if certificate_scheme == 1
+  cert = if cfg.certificateScheme == 1
-         then cert_file
+         then cfg.certificateFile
-         else if certificate_scheme == 2
+         else if cfg.certificateScheme == 2
-              then "${cert_dir}/cert-${domain}.pem"
+              then "${cfg.certificateDirectory}/cert-${cfg.domain}.pem"
               else "";
 
   # key :: PATH
-  key = if certificate_scheme == 1
+  key = if cfg.certificateScheme == 1
-        then key_file
+        then cfg.keyFile
-        else if certificate_scheme == 2
+        else if cfg.certificateScheme == 2
-             then "${cert_dir}/key-${domain}.pem"
+             then "${cfg.certificateDirectory}/key-${cfg.domain}.pem"
              else "";
 in
 {
-  # rspamd
-  rspamd = {
-    enable = true;
-  };
   
-  rmilter = import ./rmilter.nix {
+  imports = [
-    inherit domain virus_scanning dkim_signing dkim_selector dkim_dir;
+    ./rmilter.nix
-  };
+    ./postfix.nix key
-
+    ./dovecot.nix
-  postfix = import ./postfix.nix {
+  ];
-    inherit mail_dir domain valiases cert key;
-  };
-
-  dovecot2 = import ./dovecot.nix {
-    inherit vmail_group_name vmail_user_name mail_dir enable_imap
-            enable_pop3 cert key;
-  };
-
-  clamav = import ./clamav.nix {
-    inherit virus_scanning;
-  };
 }

mail-server/systemd.nix

@@ -14,22 +14,23 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ pkgs, mail_dir, vmail_group_name, certificate_scheme, cert_dir, host_prefix,
+{ config, pkgs, lib, ... }:
-domain, dkim_selector, dkim_dir}:
 
 let
-  create_certificate = if certificate_scheme == 2 then
+  cfg = config.mailserver;
+
+  create_certificate = if cfg.certificateScheme == 2 then
         ''
           # Create certificates if they do not exist yet
-          dir="${cert_dir}"
+          dir="${cfg.certificateDirectory}"
-          fqdn="${host_prefix}.${domain}"
+          fqdn="${cfg.hostPrefix}.${cfg.domain}"
           case $fqdn in /*) fqdn=$(cat "$fqdn");; esac
-          key="''${dir}/key-${domain}.pem";
+          key="''${dir}/key-${cfg.domain}.pem";
-          cert="''${dir}/cert-${domain}.pem";
+          cert="''${dir}/cert-${cfg.domain}.pem";
 
           if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ]
           then
-              mkdir -p "${cert_dir}"
+              mkdir -p "${cfg.certificateDirectory}"
               (umask 077; "${pkgs.openssl}/bin/openssl" genrsa -out "''${key}" 2048) &&
                   "${pkgs.openssl}/bin/openssl" req -new -key "''${key}" -x509 -subj "/CN=''${fqdn}" \
                           -days 3650 -out "''${cert}"
@@ -37,30 +38,31 @@ let
         ''
         else "";
 
-  dkim_key = "${dkim_dir}/${dkim_selector}.private";
+  dkim_key = "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.private";
-  dkim_txt = "${dkim_dir}/${dkim_selector}.txt";
+  dkim_txt = "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.txt";
   create_dkim_cert =
         ''
           # Create dkim dir
-          mkdir -p "${dkim_dir}"
+          mkdir -p "${cfg.dkimKeyDirectory}"
-          chown rmilter:rmilter "${dkim_dir}"
+          chown rmilter:rmilter "${cfg.dkimKeyDirectory}"
 
           if [ ! -f "${dkim_key}" ] || [ ! -f "${dkim_txt}" ]
           then
 
-              ${pkgs.opendkim}/bin/opendkim-genkey -s "${dkim_selector}" \
+              ${pkgs.opendkim}/bin/opendkim-genkey -s "${cfg.dkimSelector}" \
-                                                   -d ${domain} \
+                                                   -d ${cfg.domain} \
-                                                   --directory="${dkim_dir}"
+                                                   --directory="${cfg.dkimKeyDirectory}"
               chown rmilter:rmilter "${dkim_key}"
           fi
         '';
 in
 {
+  config = with cfg; lib.mkIf enable {
     # Make sure postfix gets started first, so that the certificates are in place
-  services.dovecot2.after = [ "postfix.service" ];
+    systemd.services.dovecot2.after = [ "postfix.service" ];
 
     # Create certificates and maildir folder
-  services.postfix = {
+    systemd.services.postfix = {
       preStart = 
       ''
       # Create mail directory and set permissions. See
@@ -74,10 +76,12 @@ in
     };
 
     # Create dkim certificates
-  services.rmilter = {
+    systemd.services.rmilter = {
       preStart =
       ''
         ${create_dkim_cert}
       '';
     };
+
+  };
 }

mail-server/users.nix

@@ -14,37 +14,41 @@
 #  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,
+{ config, pkgs, lib, ... }:
-login_accounts }:
+
+with config.mailserver;
 
 let
   vmail_user = [{
-    name = vmail_user_name;
+    name = vmailUserName;
     isNormalUser = false;
-    uid = vmail_id_start;
+    uid = vmailUIDStart;
-    home = mail_dir;
+    home = mailDirectory;
     createHome = true;
-    group = vmail_group_name;
+    group = vmailGroupName;
   }];
 
   # accountsToUser :: String -> UserRecord
-  accountsToUser = x: {
+  accountsToUser = account: {
-    name = x.name + "@" + domain;
+    name = account.name + "@" + domain;
     isNormalUser = false;
-    group = vmail_group_name;
+    group = vmailGroupName;
-    hashedPassword = x.password;
+    inherit (account) hashedPassword;
   };
 
   # mail_user :: [ UserRecord ]
-  mail_user = map accountsToUser login_accounts;
+  mail_user = map accountsToUser (lib.attrValues loginAccounts);
 
 in
 {
+
+  config = lib.mkIf enable {
     # set the vmail gid to a specific value
-  groups = {
+    users.groups = {
-    vmail = { gid = vmail_id_start; };
+      vmail = { gid = vmailUIDStart; };
     };
 
     # define all users
-  extraUsers = vmail_user ++ mail_user;
+    users.extraUsers = vmail_user ++ mail_user;
+  };
 }

nixops/single-server.nix

@@ -5,7 +5,12 @@
     { config, pkgs, ... }:
     {
         imports = [
-            ./../mail-config.nix
+            ./../default.nix
         ];
+
+        mailserver = {
+          enable = true;
+          domain = "example.com";
+        };
     };
 }