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|
{
pkgs,
vhackPackages,
}: {
scripts = {
expectNoNewMail = pkgs.writeShellScript "assert-empty-emails" ''
set -xe
# fetchmail returns EXIT_CODE 1 when no new mail
fetchmail --verbose >&2 || [ "$?" -eq 1 ] || {
echo "Mail was not empty" >&2
exit 1
}
'';
expectNewMail = pkgs.writeShellScript "assert-empty-emails" ''
set -xe
# fetchmail returns EXIT_CODE 1 when no new mail
fetchmail --verbose >&2 || [ "$?" -ne 1 ] || {
echo "No new mail" >&2
exit 1
}
'';
expectNewSpamMail = pkgs.writeShellScript "assert-empty-emails" ''
set -xe
# fetchmail returns EXIT_CODE 1 when no new mail
fetchmail --folder JUNK --verbose >&2 || [ "$?" -ne 1 ] || {
echo "No new spam mail" >&2
exit 1
}
'';
};
mkMailServer = serverName: userName: {
config,
lib,
nodes,
...
}: {
age.identityPaths = ["${../../common/email/hostKey}"];
systemd.tmpfiles.rules = [
#- path mode user group - content
"f /passwords/${userName} 777 root root - ${userName}-password"
];
age.secrets = {
"mailDkim" = {
file = ../../common/email/dkim + "/${serverName}/private.age";
mode = "600";
owner = "rspamd";
group = "rspamd";
};
};
# Disable rspamd. rspamd can't do the dns lookups in the sandbox for
# determining if something is spam or not. Therefore it just rejects every mail with
# 'Try again later.'.
# services.rspamd.enable = lib.mkForce false;
# users.users.rspamd.group = "rspamd";
# users.groups.rspamd = {};
#
# services.postfix.settings.main = {
# smtpd_milters = lib.mkForce [];
# non_smtpd_milters = lib.mkForce [];
# };
# mailserver.dkim.enable = false;
services = {
rspamd = {
locals = {
"asn.conf".text = lib.mkForce ''
enabled = false;
'';
"rbl.conf".text = lib.mkForce ''
enabled = false;
'';
"greylist.conf".text = lib.mkForce ''
enabled = false;
'';
};
};
};
# This DNS resolver is only there for rspamd (and apparently not even needed). But it
# also removes our own name server changes, so the test node could no longer find
# e.g. `acme.test` and so on.
# See: https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/work_items/100
mailserver.localDnsResolver = false;
vhack = {
mail = {
enable = true;
fqdn = serverName;
domains = [
serverName
];
security.dkimKeys."${serverName}" = {
dkimPrivateKeyPath = config.age.secrets."mailDkim".path;
dkimPublicKey =
builtins.readFile (../../common/email/dkim + "/${serverName}/public");
keyAlgorithm = "rsa-sha-256";
};
accounts = {
"${userName}@${serverName}" = {
passwordFile = "/passwords/${userName}";
};
};
};
};
};
mkDnsZone = serverName: {config, ...}: let
cfg = config.vhack.mail;
keyAlgoToKeyType = keyAlgo:
if keyAlgo == "ed25519-sha256"
then "ed25519"
else if keyAlgo == "rsa-sha-256" || keyAlgo == "rsa-sha-1"
then "rsa"
else builtins.throw "Impossible";
in {
"${serverName}" = {
MX = [
{
preference = 10;
exchange = "${serverName}.";
}
];
# https://www.rfc-editor.org/rfc/rfc6376.html#section-3.6.1
# https://www.rfc-editor.org/rfc/rfc6376.html#section-7.5
DKIM = [
{
selector = "mail";
k = keyAlgoToKeyType cfg.security.dkimKeys."${serverName}".keyAlgorithm;
p = cfg.security.dkimKeys."${serverName}".dkimPublicKey;
s = ["email"];
t = ["s"];
}
];
# https://www.rfc-editor.org/rfc/rfc7489.html#section-6.3
DMARC = [
{
adkim = "strict";
aspf = "strict";
fo = ["0" "1" "d" "s"];
p = "quarantine";
rua = "admin@vhack.eu";
ruf = ["admin@vhack.eu"];
}
];
# https://www.rfc-editor.org/rfc/rfc7208.html
# NOTE(@bpeetz): This server might not be directly sending mail, but it is still required for
# the SMTP EHLO check. <2025-02-25>
TXT = [
(builtins.concatStringsSep " "
[
"v=spf1" # The version.
"+mx" # Allow mail from this domain MX record.
"-all" # Reject all other emails if the previous mechanism did not match.
])
];
};
};
mkUser = user: mailServer: {nodes, ...}: {
environment.systemPackages = [
vhackPackages.fetchmail-common-name
pkgs.msmtp
pkgs.procmail
];
users.users."${user}" = {isNormalUser = true;};
systemd.tmpfiles.rules = [
"d /home/${user}/mail 0700 ${user} users - -"
"L /home/${user}/.fetchmailrc - - - - /etc/homeSetup/.fetchmailrc"
"L /home/${user}/.procmailrc - - - - /etc/homeSetup/.procmailrc"
"L /home/${user}/.msmtprc - - - - /etc/homeSetup/.msmtprc"
];
environment.etc = {
"homeSetup/.fetchmailrc" = {
text = ''
poll "${mailServer}" protocol IMAP
username "${user}@${mailServer}"
password "${user}-password"
ssl
mda procmail;
'';
mode = "0600";
inherit user;
};
"homeSetup/.procmailrc" = {
text = ''
DEFAULT=$HOME/mail
'';
mode = "0600";
inherit user;
};
"homeSetup/.msmtprc" = {
text = ''
account ${user}
host ${mailServer}
domain ${mailServer}
port 465
from ${user}@${mailServer}
user ${user}@${mailServer}
password ${user}-password
auth on
tls on
tls_starttls off
'';
mode = "0600";
inherit user;
};
};
};
}
|
