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# 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 <http://www.gnu.org/licenses/>
{ pkgs ? import <nixpkgs> {}}:
pkgs.nixosTest {
name = "clamav";
nodes = {
server = { config, pkgs, lib, ... }:
let
sources = import ../nix/sources.nix;
blobs = pkgs.fetchzip {
url = sources.blobs.url;
sha256 = sources.blobs.sha256;
};
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 ${blobs}/clamav/main.cvd /var/lib/clamav/
cp ${blobs}/clamav/daily.cvd /var/lib/clamav/
cp ${blobs}/clamav/bytecode.cvd /var/lib/clamav/
chown clamav:clamav /var/lib/clamav/*
'';
serviceConfig = {
Type = "oneshot";
PrivateTmp = "yes";
PrivateDevices = "yes";
};
};
mailserver = {
enable = 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 <user@example2.com>
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 <user1@example.com>
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 <user@example2.com>
To: User1 <user1@example.com>
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, ... }:
''
start_all()
server.wait_for_unit("multi-user.target")
client.wait_for_unit("multi-user.target")
# TODO put this blocking into the systemd units? I am not sure if rspamd already waits for the clamd socket.
server.wait_until_succeeds(
"set +e; timeout 1 ${nodes.server.pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ $? -eq 124 ]"
)
server.wait_until_succeeds(
"set +e; 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 --nosslcertck -v || [ $? -eq 1 ] >&2")
# Verify that mail can be sent and received before testing virus scanner
client.execute("rm ~/mail/*")
client.succeed("msmtp -a user2 user1@example.com < /etc/root/safe-email >&2")
# give the mail server some time to process the mail
server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
client.execute("rm ~/mail/*")
# fetchmail returns EXIT_CODE 0 when it retrieves mail
client.succeed("fetchmail --nosslcertck -v >&2")
client.execute("rm ~/mail/*")
with subtest("virus scan file"):
server.succeed(
'set +o pipefail; clamdscan $(readlink -f /etc/root/eicar.com.txt) | grep "Txt\\.Malware\\.Agent-1787597 FOUND" >&2'
)
with subtest("virus scan email"):
client.succeed(
'set +o pipefail; msmtp -a user2 user1\@example.com < /etc/root/virus-email 2>&1 | tee /dev/stderr | grep "server message: 554 5\\.7\\.1" >&2'
)
server.succeed("journalctl -u rspamd | grep -i eicar")
# give the mail server some time to process the mail
server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
with subtest("no warnings or errors"):
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")
'';
}
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