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Merge branch 'master' of github.com:r-raymond/nixos-mailserver

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Robin Raymond 2018-04-08 15:28:58 +02:00
commit e4c6682eb9
5 changed files with 319 additions and 19 deletions
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168
default.nix
View file

@ -66,6 +66,8 @@ in
default = [];
description = ''
A list of aliases of this login account.
Note: Use list entries like "@example.com" to create a catchAll
that allows sending from all email addresses in these domain.
'';
};
@ -75,6 +77,7 @@ in
default = [];
description = ''
For which domains should this account act as a catch all?
Note: Does not allow sending from all addresses of these domains.
'';
};
@ -135,19 +138,30 @@ in
};
extraVirtualAliases = mkOption {
type = types.attrsOf (types.enum (builtins.attrNames cfg.loginAccounts));
type = types.loaOf (mkOptionType {
name = "Login Account";
check = (ele:
let accounts = builtins.attrNames cfg.loginAccounts;
in if (builtins.isList ele)
then (builtins.all (x: builtins.elem x accounts) ele) && (builtins.length ele > 0)
else (builtins.elem ele accounts));
});
example = {
"info@example.com" = "user1@example.com";
"postmaster@example.com" = "user1@example.com";
"abuse@example.com" = "user1@example.com";
"multi@example.com" = [ "user1@example.com" "user2@example.com" ];
};
description = ''
Virtual Aliases. A virtual alias `"info@example2.com" = "user1@example.com"` means that
all mail to `info@example2.com` is forwarded to `user1@example.com`. Note
Virtual Aliases. A virtual alias `"info@example.com" = "user1@example.com"` 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`). Furthermore, it also allows
the user `user1@example.com` to send emails as `info@example2.com`.
the user `user1@example.com` to send emails as `info@example.com`.
It's also possible to create an alias for multiple accounts. In this
example all mails for `multi@example.com` will be forwarded to both
`user1@example.com` and `user2@example.com`.
'';
default = {};
};
@ -395,12 +409,22 @@ in
type = types.bool;
default = false;
description = ''
Whether to enable verbose logging for mailserver related services. This
Whether to enable verbose logging for mailserver related services. This
intended be used for development purposes only, you probably don't want
to enable this unless you're hacking on nixos-mailserver.
'';
};
maxConnectionsPerUser = mkOption {
type = types.int;
default = 100;
description = ''
Maximum number of IMAP/POP3 connections allowed for a user from each IP address.
E.g. a value of 50 allows for 50 IMAP and 50 POP3 connections at the same
time for a single user.
'';
};
localDnsResolver = mkOption {
type = types.bool;
default = true;
@ -464,10 +488,139 @@ in
description = ''
The configuration used for monitoring via monit.
Use a mail address that you actively check and set it via 'set alert ...'.
'';
};
'';
};
};
borgbackup = {
enable = mkEnableOption "backup via borgbackup";
repoLocation = mkOption {
type = types.string;
default = "/var/borgbackup";
description = ''
The location where borg saves the backups.
This can be a local path or a remote location such as user@host:/path/to/repo.
It is exported and thus available as an environment variable to cmdPreexec and cmdPostexec.
'';
};
startAt = mkOption {
type = types.string;
default = "hourly";
description = "When or how often the backup should run. Must be in the format described in systemd.time 7.";
};
user = mkOption {
type = types.string;
default = "virtualMail";
description = "The user borg and its launch script is run as.";
};
group = mkOption {
type = types.string;
default = "virtualMail";
description = "The group borg and its launch script is run as.";
};
compression = {
method = mkOption {
type = types.nullOr (types.enum ["none" "lz4" "zstd" "zlib" "lzma"]);
default = null;
description = "Leaving this unset allows borg to choose. The default for borg 1.1.4 is lz4.";
};
level = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
Denotes the level of compression used by borg.
Most methods accept levels from 0 to 9 but zstd which accepts values from 1 to 22.
If null the decision is left up to borg.
'';
};
auto = mkOption {
type = types.bool;
default = false;
description = "Leaves it to borg to determine whether an individual file should be compressed.";
};
};
encryption = {
method = mkOption {
type = types.enum [
"none"
"authenticated"
"authenticated-blake2"
"repokey"
"keyfile"
"repokey-blake2"
"keyfile-blake2"
];
default = "none";
description = ''
The backup can be encrypted by choosing any other value than 'none'.
When using encryption the password / passphrase must be provided in passphraseFile.
'';
};
passphraseFile = mkOption {
type = types.nullOr types.path;
default = null;
};
};
name = mkOption {
type = types.string;
default = "{hostname}-{user}-{now}";
description = ''
The name of the individual backups as used by borg.
Certain placeholders will be replaced by borg.
'';
};
locations = mkOption {
type = types.listOf types.path;
default = [cfg.mailDirectory];
description = "The locations that are to be backed up by borg.";
};
extraArgumentsForInit = mkOption {
type = types.listOf types.string;
default = ["--critical"];
description = "Additional arguments to add to the borg init command line.";
};
extraArgumentsForCreate = mkOption {
type = types.listOf types.string;
default = [ ];
description = "Additional arguments to add to the borg create command line e.g. '--stats'.";
};
cmdPreexec = mkOption {
type = types.nullOr types.string;
default = null;
description = ''
The command to be executed before each backup operation.
This is called prior to borg init in the same script that runs borg init and create and cmdPostexec.
Example:
export BORG_RSH="ssh -i /path/to/private/key"
'';
};
cmdPostexec = mkOption {
type = types.nullOr types.string;
default = null;
description = ''
The command to be executed after each backup operation.
This is called after borg create completed successfully and in the same script that runs
cmdPreexec, borg init and create.
'';
};
};
backup = {
enable = mkEnableOption "backup via rsnapshot";
@ -529,6 +682,7 @@ in
};
imports = [
./mail-server/borgbackup.nix
./mail-server/rsnapshot.nix
./mail-server/clamav.nix
./mail-server/monit.nix

78
mail-server/borgbackup.nix Normal file
View file

@ -0,0 +1,78 @@
# nixos-mailserver: a simple mail server
# Copyright (C) 2016-2018 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, lib, ... }:
let
cfg = config.mailserver.borgbackup;
methodFragment = lib.optional (cfg.compression.method != null) cfg.compression.method;
autoFragment =
if cfg.compression.auto && cfg.compression.method == null
then throw "compression.method must be set when using auto."
else lib.optional cfg.compression.auto "auto";
levelFragment =
if cfg.compression.level != null && cfg.compression.method == null
then throw "compression.method must be set when using compression.level."
else lib.optional (cfg.compression.level != null) (toString cfg.compression.level);
compressionFragment = lib.concatStringsSep "," (lib.flatten [autoFragment methodFragment levelFragment]);
compression = lib.optionalString (compressionFragment != "") "--compression ${compressionFragment}";
encryptionFragment = cfg.encryption.method;
passphraseFile = lib.escapeShellArg cfg.encryption.passphraseFile;
passphraseFragment = lib.optionalString (cfg.encryption.method != "none")
(if cfg.encryption.passphraseFile != null then ''env BORG_PASSPHRASE="$(cat ${passphraseFile})"''
else throw "passphraseFile must be set when using encryption.");
locations = lib.escapeShellArgs cfg.locations;
name = lib.escapeShellArg cfg.name;
repoLocation = lib.escapeShellArg cfg.repoLocation;
extraInitArgs = lib.escapeShellArgs cfg.extraArgumentsForInit;
extraCreateArgs = lib.escapeShellArgs cfg.extraArgumentsForCreate;
cmdPreexec = lib.optionalString (cfg.cmdPreexec != null) cfg.cmdPreexec;
cmdPostexec = lib.optionalString (cfg.cmdPostexec != null) cfg.cmdPostexec;
borgScript = ''
export BORG_REPO=${repoLocation}
${cmdPreexec}
${passphraseFragment} ${pkgs.borgbackup}/bin/borg init ${extraInitArgs} --encryption ${encryptionFragment} || true
${passphraseFragment} ${pkgs.borgbackup}/bin/borg create ${extraCreateArgs} ${compression} ::${name} ${locations}
${cmdPostexec}
'';
in {
config = lib.mkIf config.mailserver.borgbackup.enable {
environment.systemPackages = with pkgs; [
borgbackup
];
systemd.services.borgbackup = {
description = "borgbackup";
unitConfig.Documentation = "man:borgbackup";
script = borgScript;
serviceConfig = {
User = cfg.user;
Group = cfg.group;
CPUSchedulingPolicy = "idle";
IOSchedulingClass = "idle";
ProtectSystem = "full";
};
startAt = cfg.startAt;
};
};
}

8
mail-server/dovecot.nix
View file

@ -67,6 +67,14 @@ in
verbose_ssl = yes
''}
protocol imap {
mail_max_userip_connections = ${toString cfg.maxConnectionsPerUser}
}
protocol pop3 {
mail_max_userip_connections = ${toString cfg.maxConnectionsPerUser}
}
mail_access_groups = ${vmailGroupName}
ssl = required
${lib.optionalString (dovecotVersion.major == 2 && dovecotVersion.minor >= 3) ''

21
mail-server/postfix.nix
View file

@ -41,18 +41,15 @@ let
(map
(from:
let to = cfg.extraVirtualAliases.${from};
in "${from} ${to}")
aliasList = (l: let aliasStr = builtins.foldl' (x: y: x + y + ", ") "" l;
in builtins.substring 0 (builtins.stringLength aliasStr - 2) aliasStr);
in if (builtins.isList to) then "${from} " + (aliasList to)
else "${from} ${to}")
(builtins.attrNames cfg.extraVirtualAliases));
# all_valiases_postfix :: [ String ]
all_valiases_postfix = valiases_postfix ++ extra_valiases_postfix;
# accountToIdentity :: User -> String
accountToIdentity = account: "${account.name} ${account.name}";
# vaccounts_identity :: [ String ]
vaccounts_identity = map accountToIdentity (lib.attrValues cfg.loginAccounts);
# valiases_file :: Path
valiases_file = builtins.toFile "valias"
(lib.concatStringsSep "\n" (all_valiases_postfix ++
@ -65,10 +62,9 @@ let
# see
# https://blog.grimneko.de/2011/12/24/a-bunch-of-tips-for-improving-your-postfix-setup/
# for details on how this file looks. By using the same file as valiases,
# every alias is owned (uniquely) by its user. We have to add the users own
# address though
vaccounts_file = builtins.toFile "vaccounts" (lib.concatStringsSep "\n"
(vaccounts_identity ++ all_valiases_postfix));
# every alias is owned (uniquely) by its user.
# The user's own address is already in all_valiases_postfix.
vaccounts_file = builtins.toFile "vaccounts" (lib.concatStringsSep "\n" all_valiases_postfix);
submissionHeaderCleanupRules = pkgs.writeText "submission_header_cleanup_rules" ''
# Removes sensitive headers from mails handed in via the submission port.
@ -98,7 +94,7 @@ in
extraConfig =
''
# Extra Config
mydestination = localhost
mydestination =
smtpd_banner = ${fqdn} ESMTP NO UCE
disable_vrfy_command = yes
@ -109,6 +105,7 @@ in
virtual_gid_maps = static:5000
virtual_mailbox_base = ${mailDirectory}
virtual_mailbox_domains = ${vhosts_file}
virtual_mailbox_maps = hash:/var/lib/postfix/conf/valias
virtual_alias_maps = hash:/var/lib/postfix/conf/valias
virtual_transport = lmtp:unix:private/dovecot-lmtp

63
tests/extern.nix
View file

@ -49,6 +49,11 @@ import <nixpkgs/nixos/tests/make-test.nix> {
};
};
extraVirtualAliases = {
"single-alias@example.com" = "user1@example.com";
"multi-alias@example.com" = [ "user1@example.com" "user2@example.com" ];
};
enableImap = true;
};
};
@ -113,6 +118,13 @@ import <nixpkgs/nixos/tests/make-test.nix> {
from postmaster@example.com
user user1@example.com
password user1
account test5
host ${serverIP}
port 587
from single-alias@example.com
user user1@example.com
password user1
'';
};
"root/email1".text = ''
@ -154,6 +166,34 @@ import <nixpkgs/nixos/tests/make-test.nix> {
I think I may have misconfigured the mail server
XOXO Postmaster
'';
"root/email4".text = ''
From: Single Alias <single-alias@example.com>
To: User1 <user1@example.com>
Cc:
Bcc:
Subject: This is a test Email from single-alias\@example.com to user1
Reply-To:
Hello User1,
how are you doing today?
XOXO User1 aka Single Alias
'';
"root/email5".text = ''
From: User2 <user2@example.com>
To: Multi Alias <multi-alias@example.com>
Cc:
Bcc:
Subject: This is a test Email from user2\@example.com to multi-alias
Reply-To:
Hello Multi Alias,
how are we doing today?
XOXO User1
'';
};
};
};
@ -238,6 +278,22 @@ import <nixpkgs/nixos/tests/make-test.nix> {
$client->fail("fetchmail -v");
};
subtest "extraVirtualAliases", sub {
$client->execute("rm ~/mail/*");
# send email from single-alias to user1
$client->succeed("msmtp -a test5 --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email4 >&2");
$server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
# fetchmail returns EXIT_CODE 0 when it retrieves mail
$client->succeed("fetchmail -v");
$client->execute("rm ~/mail/*");
# send email from user1 to multi-alias (user{1,2}@example.com)
$client->succeed("msmtp -a test --tls=on --tls-certcheck=off --auth=on multi-alias\@example.com < /etc/root/email5 >&2");
$server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
# fetchmail returns EXIT_CODE 0 when it retrieves mail
$client->succeed("fetchmail -v");
};
subtest "quota", sub {
$client->execute("rm ~/mail/*");
$client->execute("mv ~/.fetchmailRcLowQuota ~/.fetchmailrc");
@ -249,5 +305,12 @@ import <nixpkgs/nixos/tests/make-test.nix> {
};
subtest "no warnings or errors", sub {
$server->fail("journalctl -u postfix | grep -i error");
$server->fail("journalctl -u postfix | grep -i warning");
$server->fail("journalctl -u dovecot2 | grep -i error");
$server->fail("journalctl -u dovecot2 | grep -i warning");
};
'';
}