nixos-config/modules/mailserver/rspamd.nix

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# SPDX-FileCopyrightText: 2023 Simon Bruder <simon@sbruder.de>
#
# SPDX-License-Identifier: AGPL-3.0-or-later
{ config, lib, ... }:
let
cfg = config.sbruder.mailserver;
in
{
options.sbruder.mailserver.spam = {
enable = (lib.mkEnableOption "spam filtering") // { default = true; };
};
config = lib.mkIf (cfg.enable && cfg.spam.enable) {
sops.secrets.rspamd-worker-controller = {
owner = config.users.users.rspamd.name;
sopsFile = ../../machines + "/${config.networking.hostName}/secrets.yaml";
};
services.rspamd = {
enable = true;
postfix.enable = true;
workers = {
normal = {
includes = [ "$CONFDIR/worker-normal.inc" ];
bindSockets = lib.singleton {
socket = "/run/rspamd/rspamd.sock";
mode = "0660";
owner = "${config.services.rspamd.user}";
group = "${config.services.rspamd.group}";
};
};
controller = {
includes = [ "$CONFDIR/worker-controller.inc" ];
bindSockets = [ "127.0.0.1:11334" ] ++ lib.optional config.sbruder.wireguard.home.enable "${config.sbruder.wireguard.home.address}:11334";
};
};
locals = {
"dkim_signing.conf".text = ''
enabled = false;
'';
"logging.inc".text = ''
# starts at info, drops to notice once started up
level = "silent";
'';
"milter_headers.conf".text = ''
extended_spam_headers = true;
'';
"multimap.conf".text = ''
SENDER_BLOCKED {
type = "from";
filter = "email:addr";
map = "/var/lib/rspamd/blocked_senders.map";
symbol = "SENDER_BLOCKED";
description = "Senders address is manually blocked";
prefilter = true;
action = "reject";
score = 30.0;
}
SENDER_DOMAIN_BLOCKED {
type = "from";
filter = "email:domain:tld";
map = "/var/lib/rspamd/blocked_sender_domains.map";
symbol = "SENDER_DOMAIN_BLOCKED";
description = "Senders effective second level domain is manually blocked";
score = 8.0;
}
'';
"redis.conf".text = ''
servers = "127.0.0.1:${toString config.services.redis.servers.rspamd.port}"
'';
"worker-controller.inc".source = config.sops.secrets.rspamd-worker-controller.path; # includes password
};
};
services.redis = {
vmOverCommit = true;
servers.rspamd = {
enable = true;
port = 6379;
};
};
};
}