misc_nixos-mailserver/mail-server/systemd.nix

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# 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/>
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{ config, pkgs, lib, ... }:
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let
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cfg = config.mailserver;
create_certificate = if cfg.certificateScheme == 2 then
''
# Create certificates if they do not exist yet
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dir="${cfg.certificateDirectory}"
fqdn="${cfg.hostPrefix}.${cfg.domain}"
case $fqdn in /*) fqdn=$(cat "$fqdn");; esac
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key="''${dir}/key-${cfg.domain}.pem";
cert="''${dir}/cert-${cfg.domain}.pem";
if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ]
then
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mkdir -p "${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}"
fi
''
else "";
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dkim_key = "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.private";
dkim_txt = "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.txt";
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create_dkim_cert =
''
# Create dkim dir
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mkdir -p "${cfg.dkimKeyDirectory}"
chown rmilter:rmilter "${cfg.dkimKeyDirectory}"
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if [ ! -f "${dkim_key}" ] || [ ! -f "${dkim_txt}" ]
then
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${pkgs.opendkim}/bin/opendkim-genkey -s "${cfg.dkimSelector}" \
-d ${cfg.domain} \
--directory="${cfg.dkimKeyDirectory}"
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chown rmilter:rmilter "${dkim_key}"
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fi
'';
in
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{
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config = with cfg; lib.mkIf enable {
# Set the correct permissions for dovecot vmail folder. See
# <http://wiki2.dovecot.org/SharedMailboxes/Permissions>. We choose
# to use the systemd service to set the folder permissions whenever
# dovecot gets started.
systemd.services.dovecot2.after = [ "postfix.service" ];
# Check for certificate before both postfix and dovecot to make sure it
# exists.
systemd.services.postfix = {
preStart =
''
# Create mail directory and set permissions
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mkdir -p "${mailDirectory}"
chgrp "${vmailGroupName}" "${mailDirectory}"
chmod 02770 "${mailDirectory}"
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${create_certificate}
'';
};
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systemd.services.rmilter = {
preStart =
''
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${create_dkim_cert}
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'';
};
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};
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}