449 lines
14 KiB
Nix
449 lines
14 KiB
Nix
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# nixos-mailserver: a simple mail server
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# Copyright (C) 2016-2018 Robin Raymond
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.mailserver;
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in
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{
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options.mailserver = {
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enable = mkEnableOption "nixos-mailserver";
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fqdn = mkOption {
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type = types.str;
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example = "mx.example.com";
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description = "The fully qualified domain name of the mail server.";
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};
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domains = mkOption {
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type = types.listOf types.str;
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example = [ "example.com" ];
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default = [];
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description = "The domains that this mail server serves.";
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};
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loginAccounts = mkOption {
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type = types.loaOf (types.submodule ({ name, ... }: {
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options = {
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name = mkOption {
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type = types.str;
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example = "user1@example.com";
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description = "Username";
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};
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hashedPassword = mkOption {
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type = types.str;
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example = "$6$evQJs5CFQyPAW09S$Cn99Y8.QjZ2IBnSu4qf1vBxDRWkaIZWOtmu1Ddsm3.H3CFpeVc0JU4llIq8HQXgeatvYhh5O33eWG3TSpjzu6/";
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description = ''
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Hashed password. Use `mkpasswd` as follows
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```
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mkpasswd -m sha-512 "super secret password"
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```
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'';
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};
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aliases = mkOption {
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type = with types; listOf types.str;
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example = ["abuse@example.com" "postmaster@example.com"];
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default = [];
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description = ''
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A list of aliases of this login account.
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'';
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};
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catchAll = mkOption {
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type = with types; listOf (enum cfg.domains);
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example = ["example.com" "example2.com"];
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default = [];
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description = ''
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For which domains should this account act as a catch all?
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'';
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};
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quota = mkOption {
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type = with types; nullOr types.str;
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default = null;
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example = "2G";
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description = ''
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Per user quota rules. Accepted sizes are `xx k/M/G/T` with the
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obvious meaning. Leave blank for the standard quota `100G`.
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'';
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};
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sieveScript = mkOption {
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type = with types; nullOr lines;
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default = null;
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example = ''
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require ["fileinto", "mailbox"];
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if address :is "from" "notifications@github.com" {
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fileinto :create "GitHub";
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stop;
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}
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# This must be the last rule, it will check if list-id is set, and
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# file the message into the Lists folder for further investigation
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elsif header :matches "list-id" "<?*>" {
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fileinto :create "Lists";
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stop;
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}
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'';
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description = ''
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Per-user sieve script.
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'';
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};
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};
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config.name = mkDefault name;
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}));
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example = {
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user1 = {
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hashedPassword = "$6$evQJs5CFQyPAW09S$Cn99Y8.QjZ2IBnSu4qf1vBxDRWkaIZWOtmu1Ddsm3.H3CFpeVc0JU4llIq8HQXgeatvYhh5O33eWG3TSpjzu6/";
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};
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user2 = {
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hashedPassword = "$6$oE0ZNv2n7Vk9gOf$9xcZWCCLGdMflIfuA0vR1Q1Xblw6RZqPrP94mEit2/81/7AKj2bqUai5yPyWE.QYPyv6wLMHZvjw3Rlg7yTCD/";
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};
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};
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description = ''
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The login account of the domain. Every account is mapped to a unix user,
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e.g. `user1@example.com`. To generate the passwords use `mkpasswd` as
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follows
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```
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mkpasswd -m sha-512 "super secret password"
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```
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'';
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default = {};
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};
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extraVirtualAliases = mkOption {
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type = types.attrsOf (types.enum (builtins.attrNames cfg.loginAccounts));
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example = {
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"info@example.com" = "user1@example.com";
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"postmaster@example.com" = "user1@example.com";
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"abuse@example.com" = "user1@example.com";
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};
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description = ''
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Virtual Aliases. A virtual alias `"info@example2.com" = "user1@example.com"` means that
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all mail to `info@example2.com` is forwarded to `user1@example.com`. Note
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that it is expected that `postmaster@example.com` and `abuse@example.com` is
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forwarded to some valid email address. (Alternatively you can create login
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accounts for `postmaster` and (or) `abuse`). Furthermore, it also allows
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the user `user1@example.com` to send emails as `info@example2.com`.
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'';
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default = {};
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};
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virtualAliases = mkOption {
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type = types.attrsOf (types.enum (builtins.attrNames cfg.loginAccounts));
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example = {
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"info@example.com" = "user1@example.com";
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"postmaster@example.com" = "user1@example.com";
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"abuse@example.com" = "user1@example.com";
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};
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description = ''
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Alias for extraVirtualAliases. Deprecated.
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'';
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default = {};
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};
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vmailUID = mkOption {
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type = types.int;
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default = 5000;
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description = ''
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The unix UID of the virtual mail user. Be mindful that if this is
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changed, you will need to manually adjust the permissions of
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mailDirectory.
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'';
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};
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vmailUserName = mkOption {
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type = types.str;
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default = "virtualMail";
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description = ''
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The user name and group name of the user that owns the directory where all
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the mail is stored.
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'';
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};
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vmailGroupName = mkOption {
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type = types.str;
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default = "virtualMail";
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description = ''
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The user name and group name of the user that owns the directory where all
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the mail is stored.
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'';
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};
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mailDirectory = mkOption {
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type = types.path;
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default = "/var/vmail";
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description = ''
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Where to store the mail.
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'';
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};
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certificateScheme = mkOption {
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type = types.enum [ 1 2 3 ];
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default = 2;
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description = ''
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Certificate Files. There are three options for these.
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1) You specify locations and manually copy certificates there.
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2) You let the server create new (self signed) certificates on the fly.
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3) You let the server create a certificate via `Let's Encrypt`. Note that
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this implies that a stripped down webserver has to be started. This also
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implies that the FQDN must be set as an `A` record to point to the IP of
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the server. In particular port 80 on the server will be opened. For details
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on how to set up the domain records, see the guide in the readme.
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'';
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};
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certificateFile = mkOption {
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type = types.path;
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example = "/root/mail-server.crt";
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description = ''
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Scheme 1)
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Location of the certificate
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'';
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};
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keyFile = mkOption {
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type = types.path;
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example = "/root/mail-server.key";
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description = ''
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Scheme 1)
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Location of the key file
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'';
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};
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certificateDirectory = mkOption {
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type = types.path;
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default = "/var/certs";
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description = ''
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Sceme 2)
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This is the folder where the certificate will be created. The name is
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hardcoded to "cert-<domain>.pem" and "key-<domain>.pem" and the
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certificate is valid for 10 years.
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'';
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};
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enableImap = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable imap / pop3. Both variants are only supported in the
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(sane) startTLS configuration. The ports are
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110 - Pop3
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143 - IMAP
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587 - SMTP with login
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'';
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};
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enableImapSsl = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable IMAPS, setting this option to true will open port 993
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in the firewall.
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'';
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};
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enablePop3 = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable POP3. Both variants are only supported in the (sane)
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startTLS configuration. The ports are
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110 - Pop3
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143 - IMAP
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587 - SMTP with login
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'';
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};
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enablePop3Ssl = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable POP3S, setting this option to true will open port 995
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in the firewall.
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'';
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};
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enableManageSieve = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable ManageSieve, setting this option to true will open
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port 4190 in the firewall.
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The ManageSieve protocol allows users to manage their Sieve scripts on
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a remote server with a supported client, including Thunderbird.
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'';
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};
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virusScanning = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to activate virus scanning. Note that virus scanning is _very_
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expensive memory wise.
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'';
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};
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dkimSigning = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to activate dkim signing.
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'';
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};
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dkimSelector = mkOption {
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type = types.str;
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default = "mail";
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description = ''
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'';
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};
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dkimKeyDirectory = mkOption {
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type = types.path;
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default = "/var/dkim";
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description = ''
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'';
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};
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dhParamBitLength = mkOption {
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type = types.int;
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default = 2048;
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description =
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''
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Length of the Diffie Hillman prime used (in bits). It might be a good
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idea to set this to 4096 for security purposed, but it will take a _very_
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long time to create this prime on startup.
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'';
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};
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debug = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable verbose logging for mailserver related services. This
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intended be used for development purposes only, you probably don't want
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to enable this unless you're hacking on nixos-mailserver.
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'';
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};
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localDnsResolver = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Runs a local DNS resolver (kresd) as recommended when running rspamd. This prevents your log file from filling up with rspamd_monitored_dns_mon entries.
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'';
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};
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monitoring = {
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enable = mkEnableOption "monitoring via monit";
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alertAddress = mkOption {
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type = types.string;
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description = ''
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The email address to send alerts to.
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'';
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};
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config = mkOption {
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type = types.string;
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default = ''
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set daemon 120 with start delay 60
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set mailserver
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localhost
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set httpd port 2812 and use address localhost
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allow localhost
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allow admin:obwjoawijerfoijsiwfj29jf2f2jd
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check filesystem root with path /
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if space usage > 80% then alert
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if inode usage > 80% then alert
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check system $HOST
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if cpu usage > 95% for 10 cycles then alert
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if memory usage > 75% for 5 cycles then alert
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if swap usage > 20% for 10 cycles then alert
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if loadavg (1min) > 90 for 15 cycles then alert
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if loadavg (5min) > 80 for 10 cycles then alert
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if loadavg (15min) > 70 for 8 cycles then alert
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check process sshd with pidfile /var/run/sshd.pid
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start program "${pkgs.systemd}/bin/systemctl start sshd"
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stop program "${pkgs.systemd}/bin/systemctl stop sshd"
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if failed port 22 protocol ssh for 2 cycles then restart
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check process postfix with pidfile /var/lib/postfix/queue/pid/master.pid
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start program = "${pkgs.systemd}/bin/systemctl start postfix"
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stop program = "${pkgs.systemd}/bin/systemctl stop postfix"
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if failed port 25 protocol smtp for 5 cycles then restart
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check process dovecot with pidfile /var/run/dovecot2/master.pid
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start program = "${pkgs.systemd}/bin/systemctl start dovecot2"
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stop program = "${pkgs.systemd}/bin/systemctl stop dovecot2"
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if failed host ${cfg.fqdn} port 993 type tcpssl sslauto protocol imap for 5 cycles then restart
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check process rspamd with pidfile /var/run/rspamd.pid
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start program = "${pkgs.systemd}/bin/systemctl start rspamd"
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stop program = "${pkgs.systemd}/bin/systemctl stop rspamd"
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'';
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description = ''
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The configuration used for monitoring via monit.
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Use a mail address that you actively check and set it via 'set alert ...'.
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'';
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};
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};
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};
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imports = [
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./mail-server/clamav.nix
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./mail-server/monit.nix
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./mail-server/users.nix
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./mail-server/environment.nix
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./mail-server/networking.nix
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./mail-server/systemd.nix
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./mail-server/dovecot.nix
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./mail-server/postfix.nix
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./mail-server/rmilter.nix
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./mail-server/nginx.nix
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./mail-server/kresd.nix
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];
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config = lib.mkIf config.mailserver.enable {
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warnings = if (config.mailserver.virtualAliases != {}) then [ ''
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virtualAliases had been derprecated. Use extraVirtualAliases instead or
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use the `aliases` field of the loginAccount attribute set
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'']
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else [];
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};
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}
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