101 lines
3.8 KiB
Nix
101 lines
3.8 KiB
Nix
# 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, pkgs, lib, ... }:
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let
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cfg = config.mailserver;
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createDhParameterFile =
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lib.optionalString (lib.versionAtLeast (lib.getVersion pkgs.dovecot) "2.3")
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''
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# Create a dh parameter file
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if [ ! -s "${cfg.certificateDirectory}/dh.pem" ]
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then
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mkdir -p "${cfg.certificateDirectory}"
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${pkgs.openssl}/bin/openssl \
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dhparam ${builtins.toString cfg.dhParamBitLength} \
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> "${cfg.certificateDirectory}/dh.pem"
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fi
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'';
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preliminarySelfsigned = config.security.acme.preliminarySelfsigned;
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acmeWantsTarget = [ "acme-certificates.target" ]
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++ (lib.optional preliminarySelfsigned "acme-selfsigned-certificates.target");
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acmeAfterTarget = if preliminarySelfsigned
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then [ "acme-selfsigned-certificates.target" ]
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else [ "acme-certificates.target" ];
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in
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{
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config = with cfg; lib.mkIf enable {
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# Add target for when certificates are available
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systemd.targets."mailserver-certificates" = {
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wants = lib.mkIf (cfg.certificateScheme == 3) acmeWantsTarget;
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after = lib.mkIf (cfg.certificateScheme == 3) acmeAfterTarget;
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};
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# Create self signed certificate
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systemd.services.mailserver-selfsigned-certificate = lib.mkIf (cfg.certificateScheme == 2) {
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wantedBy = [ "mailserver-certificates.target" ];
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after = [ "local-fs.target" ];
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before = [ "mailserver-certificates.target" ];
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script = ''
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# Create certificates if they do not exist yet
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dir="${cfg.certificateDirectory}"
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fqdn="${cfg.fqdn}"
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case $fqdn in /*) fqdn=$(cat "$fqdn");; esac
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key="''${dir}/key-${cfg.fqdn}.pem";
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cert="''${dir}/cert-${cfg.fqdn}.pem";
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if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ]
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then
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mkdir -p "${cfg.certificateDirectory}"
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(umask 077; "${pkgs.openssl}/bin/openssl" genrsa -out "''${key}" 2048) &&
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"${pkgs.openssl}/bin/openssl" req -new -key "''${key}" -x509 -subj "/CN=''${fqdn}" \
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-days 3650 -out "''${cert}"
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fi
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'';
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serviceConfig = {
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Type = "oneshot";
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PrivateTmp = true;
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};
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};
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# Create maildir folder and dh parameters before dovecot startup
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systemd.services.dovecot2 = {
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after = [ "mailserver-certificates.target" ];
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wants = [ "mailserver-certificates.target" ];
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preStart = ''
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# Create mail directory and set permissions. See
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# <http://wiki2.dovecot.org/SharedMailboxes/Permissions>.
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mkdir -p "${mailDirectory}"
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chgrp "${vmailGroupName}" "${mailDirectory}"
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chmod 02770 "${mailDirectory}"
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${createDhParameterFile}
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'';
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};
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# Postfix requires dovecot lmtp socket, dovecot auth socket and certificate to work
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systemd.services.postfix = {
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after = [ "dovecot2.service" "mailserver-certificates.target" ]
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++ (lib.optional cfg.dkimSigning "opendkim.service");
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wants = [ "mailserver-certificates.target" ];
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requires = [ "dovecot2.service" ]
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++ (lib.optional cfg.dkimSigning "opendkim.service");
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};
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};
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}
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