misc_nixos-mailserver/mail-server/systemd.nix
Robin Raymond b68e64ec72 certificate scheme 2
On the fly create certificates via openssl (Maybe change this to
libressl in the future?). This is probably the best scheme to get
something that simply works. Self signed certificates only pose a
problem when connecting to retrieve the email via imap or pop3.
2017-08-13 11:51:07 +02:00

61 lines
2.1 KiB
Nix

# 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/>
{ pkgs, mail_dir, vmail_group_name, certificate_scheme, cert_dir, host_prefix,
domain }:
let
create_certificate = if certificate_scheme == 2 then
''
# Create certificates if they do not exist yet
dir="${cert_dir}"
fqdn="${host_prefix}.${domain}"
case $fqdn in /*) fqdn=$(cat "$fqdn");; esac
key="''${dir}/key-${domain}.pem";
cert="''${dir}/cert-${domain}.pem";
if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ]
then
mkdir -p "${cert_dir}"
(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 "";
in
{
# 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.
services.dovecot2.preStart =
''
# Create mail directory and set permissions
mkdir -p "${mail_dir}"
chgrp "${vmail_group_name}" "${mail_dir}"
chmod 02770 "${mail_dir}"
${create_certificate}
'';
# Check for certificate before both postfix and dovecot to make sure it
# exists.
services.postfix.preStart =
''
${create_certificate}
'';
}