# 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
import {
nodes = {
server = { config, pkgs, lib, ... }:
let
clamav-db-files = pkgs.stdenv.mkDerivation rec {
name = "clamav-db-files";
src = lib.cleanSource ./clamav;
dontUnpack = true;
installPhase = ''
mkdir $out
cp -R $src/*.cvd $out/
'';
};
in
{
imports = [
../default.nix
./lib/config.nix
];
virtualisation.memorySize = 1500;
services.rsyslogd = {
enable = true;
defaultConfig = ''
*.* /dev/console
'';
};
services.clamav.updater.enable = lib.mkForce false;
systemd.services.old-clam = {
before = [ "clamav-daemon.service" ];
requiredBy = [ "clamav-daemon.service" ];
description = "ClamAV virus database";
preStart = ''
mkdir -m 0755 -p /var/lib/clamav
chown clamav:clamav /var/lib/clamav
'';
script = ''
cp ${clamav-db-files}/main.cvd /var/lib/clamav/
cp ${clamav-db-files}/daily.cvd /var/lib/clamav/
cp ${clamav-db-files}/bytecode.cvd /var/lib/clamav/
chown clamav:clamav /var/lib/clamav/*
'';
serviceConfig = {
Type = "oneshot";
PrivateTmp = "yes";
PrivateDevices = "yes";
};
};
mailserver = {
enable = true;
debug = true;
fqdn = "mail.example.com";
domains = [ "example.com" "example2.com" ];
virusScanning = true;
loginAccounts = {
"user1@example.com" = {
hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/";
aliases = [ "postmaster@example.com" ];
catchAll = [ "example.com" ];
};
"user@example2.com" = {
hashedPassword = "$6$u61JrAtuI0a$nGEEfTP5.eefxoScUGVG/Tl0alqla2aGax4oTd85v3j3xSmhv/02gNfSemv/aaMinlv9j/ZABosVKBrRvN5Qv0";
};
};
enableImap = true;
};
environment.etc = {
"root/eicar.com.txt".text = "X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*";
};
};
client = { nodes, config, pkgs, ... }: let
serverIP = nodes.server.config.networking.primaryIPAddress;
clientIP = nodes.client.config.networking.primaryIPAddress;
grep-ip = pkgs.writeScriptBin "grep-ip" ''
#!${pkgs.stdenv.shell}
echo grep '${clientIP}' "$@" >&2
exec grep '${clientIP}' "$@"
'';
in {
imports = [
./lib/config.nix
];
environment.systemPackages = with pkgs; [
fetchmail msmtp procmail findutils grep-ip
];
environment.etc = {
"root/.fetchmailrc" = {
text = ''
poll ${serverIP} with proto IMAP
user 'user1@example.com' there with password 'user1' is 'root' here
mda procmail
'';
mode = "0700";
};
"root/.procmailrc" = {
text = "DEFAULT=$HOME/mail";
};
"root/.msmtprc" = {
text = ''
defaults
tls on
tls_certcheck off
account user2
host ${serverIP}
port 587
from user@example2.com
auth on
user user@example2.com
password user2
'';
};
"root/virus-email".text = ''
From: User2
Content-Type: multipart/mixed;
boundary="Apple-Mail=_2689C63E-FD18-4E4D-8822-54797BDA9607"
Mime-Version: 1.0 (Mac OS X Mail 11.3 \(3445.6.18\))
Subject: Testy McTest
Message-Id: <94550DD9-1FF1-4ED1-9F09-8812FF2E59AA@example.com>
Date: Sat, 12 May 2018 14:15:44 +0200
To: User1
X-Mailer: Apple Mail (2.3445.6.18)
--Apple-Mail=_2689C63E-FD18-4E4D-8822-54797BDA9607
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
charset=us-ascii
Hello
I have attached a dangerous virus.
Mfg.
User2
--Apple-Mail=_2689C63E-FD18-4E4D-8822-54797BDA9607
Content-Disposition: attachment;
filename=eicar.com.txt
Content-Type: text/plain;
x-unix-mode=0644;
name="eicar.com.txt"
Content-Transfer-Encoding: 7bit
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
--Apple-Mail=_2689C63E-FD18-4E4D-8822-54797BDA9607--
'';
"root/safe-email".text = ''
From: User
To: User1
Cc:
Bcc:
Subject: This is a test Email from user@example2.com to user1
Reply-To:
Hello User1,
how are you doing today?
XOXO User1
'';
};
};
};
testScript = { nodes, ... }:
''
startAll;
$server->waitForUnit("multi-user.target");
$client->waitForUnit("multi-user.target");
# TODO put this blocking into the systemd units? I am not sure if rspamd already waits for the clamd socket.
$server->waitUntilSucceeds("timeout 1 ${nodes.server.pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ \$? -eq 124 ]");
$server->waitUntilSucceeds("timeout 1 ${nodes.server.pkgs.netcat}/bin/nc -U /run/clamav/clamd.ctl < /dev/null; [ \$? -eq 124 ]");
$client->execute("cp -p /etc/root/.* ~/");
$client->succeed("mkdir -p ~/mail");
$client->succeed("ls -la ~/ >&2");
$client->succeed("cat ~/.fetchmailrc >&2");
$client->succeed("cat ~/.procmailrc >&2");
$client->succeed("cat ~/.msmtprc >&2");
# fetchmail returns EXIT_CODE 1 when no new mail
$client->succeed("fetchmail -v || [ \$? -eq 1 ] >&2");
# Verify that mail can be sent and received before testing virus scanner
$client->execute("rm ~/mail/*");
$client->succeed("msmtp -a user2 user1\@example.com < /etc/root/safe-email >&2");
# give the mail server some time to process the mail
$server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
$client->execute("rm ~/mail/*");
# fetchmail returns EXIT_CODE 0 when it retrieves mail
$client->succeed("fetchmail -v >&2");
$client->execute("rm ~/mail/*");
subtest "virus scan file", sub {
$server->succeed("clamdscan \$(readlink -f /etc/root/eicar.com.txt) | grep \"Txt\\.Malware\\.Agent-1787597 FOUND\" >&2");
};
subtest "virus scan email", sub {
$client->succeed("msmtp -a user2 user1\@example.com < /etc/root/virus-email 2>&1 | grep \"server message: 554 5\\.7\\.1 clamav: virus found: .*\\(Eicar\\|EICAR\\)\" >&2"); # for some reason this ID is nondetermistic...
# give the mail server some time to process the mail
$server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
};
subtest "no warnings or errors", sub {
$server->fail("journalctl -u postfix | grep -i error >&2");
$server->fail("journalctl -u postfix | grep -i warning >&2");
$server->fail("journalctl -u dovecot2 | grep -i error >&2");
$server->fail("journalctl -u dovecot2 | grep -i warning >&2");
};
'';
}