nixos-mailserver/mail-server/rspamd.nix
2024-03-08 14:52:52 +01:00

181 lines
5.8 KiB
Nix

# 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/>
{ config, pkgs, lib, ... }:
let
cfg = config.mailserver;
postfixCfg = config.services.postfix;
rspamdCfg = config.services.rspamd;
rspamdSocket = "rspamd.service";
in
{
config = with cfg; lib.mkIf enable {
services.rspamd = {
enable = true;
inherit debug;
locals = {
"milter_headers.conf" = { text = ''
extended_spam_headers = true;
''; };
"redis.conf" = { text = ''
servers = "${cfg.redis.address}:${toString cfg.redis.port}";
'' + (lib.optionalString (cfg.redis.password != null) ''
password = "${cfg.redis.password}";
''); };
"classifier-bayes.conf" = { text = ''
cache {
backend = "redis";
}
''; };
"antivirus.conf" = lib.mkIf cfg.virusScanning { text = ''
clamav {
action = "reject";
symbol = "CLAM_VIRUS";
type = "clamav";
log_clean = true;
servers = "/run/clamav/clamd.ctl";
scan_mime_parts = false; # scan mail as a whole unit, not parts. seems to be needed to work at all
}
''; };
"dkim_signing.conf" = { text = ''
# Disable outbound email signing, we use opendkim for this
enabled = false;
''; };
"dmarc.conf" = { text = ''
${lib.optionalString cfg.dmarcReporting.enable ''
reporting {
enabled = true;
email = "${cfg.dmarcReporting.email}";
domain = "${cfg.dmarcReporting.domain}";
org_name = "${cfg.dmarcReporting.organizationName}";
from_name = "${cfg.dmarcReporting.fromName}";
msgid_from = "dmarc-rua";
}''}
''; };
};
workers.rspamd_proxy = {
type = "rspamd_proxy";
bindSockets = [{
socket = "/run/rspamd/rspamd-milter.sock";
mode = "0664";
}];
count = 1; # Do not spawn too many processes of this type
extraConfig = ''
milter = yes; # Enable milter mode
timeout = 120s; # Needed for Milter usually
upstream "local" {
default = yes; # Self-scan upstreams are always default
self_scan = yes; # Enable self-scan
}
'';
};
workers.controller = {
type = "controller";
count = 1;
bindSockets = [{
socket = "/run/rspamd/worker-controller.sock";
mode = "0666";
}];
includes = [];
extraConfig = ''
static_dir = "''${WWWDIR}"; # Serve the web UI static assets
'';
};
};
services.redis.servers.rspamd = {
enable = lib.mkDefault true;
port = lib.mkDefault 6380;
};
systemd.services.rspamd = {
requires = [ "redis-rspamd.service" ] ++ (lib.optional cfg.virusScanning "clamav-daemon.service");
after = [ "redis-rspamd.service" ] ++ (lib.optional cfg.virusScanning "clamav-daemon.service");
};
systemd.services.rspamd-dmarc-reporter = lib.optionalAttrs (cfg.dmarcReporting.enable) {
# Explicitly select yesterday's date to work around broken
# default behaviour when called without a date.
# https://github.com/rspamd/rspamd/issues/4062
script = ''
${pkgs.rspamd}/bin/rspamadm dmarc_report $(date -d "yesterday" "+%Y%m%d")
'';
serviceConfig = {
User = "${config.services.rspamd.user}";
Group = "${config.services.rspamd.group}";
AmbientCapabilities = [];
CapabilityBoundingSet = "";
DevicePolicy = "closed";
IPAddressAllow = "localhost";
LockPersonality = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateMounts = true;
PrivateTmp = true;
PrivateUsers = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProcSubset = "pid";
ProtectSystem = "strict";
RemoveIPC = true;
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = [
"@system-service"
"~@privileged"
];
UMask = "0077";
};
};
systemd.timers.rspamd-dmarc-reporter = lib.optionalAttrs (cfg.dmarcReporting.enable) {
description = "Daily delivery of aggregated DMARC reports";
wantedBy = [
"timers.target"
];
timerConfig = {
OnCalendar = "daily";
Persistent = true;
RandomizedDelaySec = 86400;
FixedRandomDelay = true;
};
};
systemd.services.postfix = {
after = [ rspamdSocket ];
requires = [ rspamdSocket ];
};
users.extraUsers.${postfixCfg.user}.extraGroups = [ rspamdCfg.group ];
};
}