117 lines
4 KiB
Nix
117 lines
4 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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create_certificate = if cfg.certificateScheme == 2 then
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''
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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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else "";
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createDhParameterFile =
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''
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# Create a dh parameter file
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if [ ! -f "${cfg.certificateDirectory}/dh.pem" ]
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then
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mkdir -p "${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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createDomainDkimCert = dom:
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let
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dkim_key = "${cfg.dkimKeyDirectory}/${dom}.${cfg.dkimSelector}.key";
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dkim_txt = "${cfg.dkimKeyDirectory}/${dom}.${cfg.dkimSelector}.txt";
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in
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''
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if [ ! -f "${dkim_key}" ] || [ ! -f "${dkim_txt}" ]
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then
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${pkgs.opendkim}/bin/opendkim-genkey -s "${cfg.dkimSelector}" \
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-d "${dom}" \
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--directory="${cfg.dkimKeyDirectory}"
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mv "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.private" "${dkim_key}"
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mv "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.txt" "${dkim_txt}"
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fi
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'';
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createAllCerts = lib.concatStringsSep "\n" (map createDomainDkimCert cfg.domains);
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create_dkim_cert =
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''
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# Create dkim dir
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mkdir -p "${cfg.dkimKeyDirectory}"
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chown rmilter:rmilter "${cfg.dkimKeyDirectory}"
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${createAllCerts}
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chown -R rmilter:rmilter "${cfg.dkimKeyDirectory}"
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'';
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in
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{
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config = with cfg; lib.mkIf enable {
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# Make sure postfix gets started first, so that the certificates are in place
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systemd.services.dovecot2.after = [ "postfix.service" ];
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# Create certificates and maildir folder
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systemd.services.postfix = {
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after = (if (certificateScheme == 3) then [ "nginx.service" ] else []);
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preStart =
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''
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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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${create_certificate}
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${let
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dovecotVersion = builtins.fromJSON
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(builtins.readFile (pkgs.callPackage ./dovecot-version.nix {}));
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in lib.optionalString
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(dovecotVersion.major == 2 && dovecotVersion.minor >= 3)
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createDhParameterFile}
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'';
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};
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# Create dkim certificates
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systemd.services.rmilter = {
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requires = [ "rmilter.socket" ];
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after = [ "rmilter.socket" ];
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preStart =
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''
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${create_dkim_cert}
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'';
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};
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};
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}
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