2021-09-10 11:08:58 +00:00
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{ config, lib, pkgs, ... }:
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with lib;
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let
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2021-12-29 11:49:14 +00:00
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2021-09-10 11:08:58 +00:00
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name = "maddy";
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2021-12-29 11:49:14 +00:00
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2021-09-10 11:08:58 +00:00
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cfg = config.services.maddy;
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2021-12-29 11:49:14 +00:00
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2021-09-10 11:08:58 +00:00
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defaultConfig = ''
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2021-12-29 11:49:14 +00:00
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# Minimal configuration with TLS disabled, adapted from upstream example
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# configuration here https://github.com/foxcpp/maddy/blob/master/maddy.conf
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# Do not use this in production!
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2021-09-10 11:08:58 +00:00
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tls off
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auth.pass_table local_authdb {
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table sql_table {
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driver sqlite3
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dsn credentials.db
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table_name passwords
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}
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}
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storage.imapsql local_mailboxes {
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driver sqlite3
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dsn imapsql.db
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}
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table.chain local_rewrites {
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optional_step regexp "(.+)\+(.+)@(.+)" "$1@$3"
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optional_step static {
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entry postmaster postmaster@$(primary_domain)
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}
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optional_step file /etc/maddy/aliases
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}
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msgpipeline local_routing {
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destination postmaster $(local_domains) {
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modify {
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replace_rcpt &local_rewrites
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}
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deliver_to &local_mailboxes
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}
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default_destination {
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reject 550 5.1.1 "User doesn't exist"
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}
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}
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smtp tcp://0.0.0.0:25 {
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limits {
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all rate 20 1s
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all concurrency 10
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}
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dmarc yes
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check {
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require_mx_record
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dkim
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spf
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}
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source $(local_domains) {
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reject 501 5.1.8 "Use Submission for outgoing SMTP"
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}
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default_source {
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destination postmaster $(local_domains) {
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deliver_to &local_routing
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}
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default_destination {
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reject 550 5.1.1 "User doesn't exist"
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}
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}
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}
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submission tcp://0.0.0.0:587 {
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limits {
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all rate 50 1s
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}
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auth &local_authdb
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source $(local_domains) {
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check {
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authorize_sender {
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prepare_email &local_rewrites
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user_to_email identity
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}
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}
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destination postmaster $(local_domains) {
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deliver_to &local_routing
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}
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default_destination {
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modify {
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dkim $(primary_domain) $(local_domains) default
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}
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deliver_to &remote_queue
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}
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}
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default_source {
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reject 501 5.1.8 "Non-local sender domain"
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}
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}
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target.remote outbound_delivery {
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limits {
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destination rate 20 1s
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destination concurrency 10
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}
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mx_auth {
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dane
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mtasts {
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cache fs
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fs_dir mtasts_cache/
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}
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local_policy {
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min_tls_level encrypted
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min_mx_level none
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}
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}
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}
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target.queue remote_queue {
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target &outbound_delivery
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autogenerated_msg_domain $(primary_domain)
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bounce {
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destination postmaster $(local_domains) {
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deliver_to &local_routing
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}
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default_destination {
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reject 550 5.0.0 "Refusing to send DSNs to non-local addresses"
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}
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}
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}
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imap tcp://0.0.0.0:143 {
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auth &local_authdb
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storage &local_mailboxes
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}
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'';
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in {
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options = {
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services.maddy = {
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2021-12-29 11:49:14 +00:00
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2022-08-28 19:18:44 +00:00
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enable = mkEnableOption (lib.mdDoc "Maddy, a free an open source mail server");
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2021-09-10 11:08:58 +00:00
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user = mkOption {
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default = "maddy";
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type = with types; uniq string;
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description = ''
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2021-12-29 11:49:14 +00:00
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User account under which maddy runs.
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<note><para>
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If left as the default value this user will automatically be created
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on system activation, otherwise the sysadmin is responsible for
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ensuring the user exists before the maddy service starts.
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</para></note>
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2021-09-10 11:08:58 +00:00
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'';
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};
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2021-12-29 11:49:14 +00:00
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2021-09-10 11:08:58 +00:00
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group = mkOption {
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default = "maddy";
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type = with types; uniq string;
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description = ''
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2021-12-29 11:49:14 +00:00
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Group account under which maddy runs.
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<note><para>
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If left as the default value this group will automatically be created
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on system activation, otherwise the sysadmin is responsible for
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ensuring the group exists before the maddy service starts.
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</para></note>
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2021-09-10 11:08:58 +00:00
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'';
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};
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hostname = mkOption {
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default = "localhost";
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type = with types; uniq string;
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example = ''example.com'';
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2022-07-28 21:19:15 +00:00
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description = lib.mdDoc ''
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2021-09-10 11:08:58 +00:00
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Hostname to use. It should be FQDN.
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'';
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};
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2021-12-29 11:49:14 +00:00
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2021-09-10 11:08:58 +00:00
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primaryDomain = mkOption {
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default = "localhost";
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type = with types; uniq string;
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example = ''mail.example.com'';
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2022-07-28 21:19:15 +00:00
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description = lib.mdDoc ''
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2021-09-10 11:08:58 +00:00
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Primary MX domain to use. It should be FQDN.
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'';
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};
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2021-12-29 11:49:14 +00:00
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2021-09-10 11:08:58 +00:00
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localDomains = mkOption {
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type = with types; listOf str;
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default = ["$(primary_domain)"];
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example = [
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"$(primary_domain)"
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"example.com"
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"other.example.com"
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];
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2022-07-28 21:19:15 +00:00
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description = lib.mdDoc ''
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2021-09-10 11:08:58 +00:00
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Define list of allowed domains.
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'';
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};
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2021-12-29 11:49:14 +00:00
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2021-09-10 11:08:58 +00:00
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config = mkOption {
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type = with types; nullOr lines;
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default = defaultConfig;
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description = ''
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2021-12-29 11:49:14 +00:00
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Server configuration, see
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<link xlink:href="https://maddy.email">https://maddy.email</link> for
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more information. The default configuration of this module will setup
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minimal maddy instance for mail transfer without TLS encryption.
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<note><para>
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This should not be used in a production environment.
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</para></note>
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2021-09-10 11:08:58 +00:00
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'';
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};
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openFirewall = mkOption {
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type = types.bool;
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default = false;
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2022-07-28 21:19:15 +00:00
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description = lib.mdDoc ''
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2021-09-10 11:08:58 +00:00
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Open the configured incoming and outgoing mail server ports.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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systemd = {
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packages = [ pkgs.maddy ];
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services.maddy = {
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serviceConfig = {
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2021-12-29 11:49:14 +00:00
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User = cfg.user;
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Group = cfg.group;
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StateDirectory = [ "maddy" ];
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2021-09-10 11:08:58 +00:00
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};
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2021-12-29 11:49:14 +00:00
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restartTriggers = [ config.environment.etc."maddy/maddy.conf".source ];
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2021-09-10 11:08:58 +00:00
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wantedBy = [ "multi-user.target" ];
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};
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};
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environment.etc."maddy/maddy.conf" = {
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text = ''
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$(hostname) = ${cfg.hostname}
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$(primary_domain) = ${cfg.primaryDomain}
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$(local_domains) = ${toString cfg.localDomains}
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hostname ${cfg.hostname}
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${cfg.config}
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'';
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};
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2021-12-29 11:49:14 +00:00
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users.users = optionalAttrs (cfg.user == name) {
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${name} = {
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2021-09-10 11:08:58 +00:00
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isSystemUser = true;
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2021-12-29 11:49:14 +00:00
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group = cfg.group;
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description = "Maddy mail transfer agent user";
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2021-09-10 11:08:58 +00:00
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};
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};
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2021-12-29 11:49:14 +00:00
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users.groups = optionalAttrs (cfg.group == name) {
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${cfg.group} = { };
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2021-09-10 11:08:58 +00:00
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};
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networking.firewall = mkIf cfg.openFirewall {
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allowedTCPPorts = [ 25 143 587 ];
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};
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environment.systemPackages = [
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pkgs.maddy
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];
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};
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}
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