532 lines
18 KiB
Nix
532 lines
18 KiB
Nix
{ config, lib, options, pkgs, ... }:
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let
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cfg = config.services.parsedmarc;
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opt = options.services.parsedmarc;
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isSecret = v: isAttrs v && v ? _secret && isString v._secret;
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ini = pkgs.formats.ini {
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mkKeyValue = lib.flip lib.generators.mkKeyValueDefault "=" rec {
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mkValueString = v:
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if isInt v then toString v
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else if isString v then v
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else if true == v then "True"
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else if false == v then "False"
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else if isSecret v then hashString "sha256" v._secret
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else throw "unsupported type ${typeOf v}: ${(lib.generators.toPretty {}) v}";
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};
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};
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inherit (builtins) elem isAttrs isString isInt isList typeOf hashString;
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in
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{
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options.services.parsedmarc = {
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enable = lib.mkEnableOption ''
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parsedmarc, a DMARC report monitoring service
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'';
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provision = {
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localMail = {
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enable = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether Postfix and Dovecot should be set up to receive
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mail locally. parsedmarc will be configured to watch the
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local inbox as the automatically created user specified in
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[](#opt-services.parsedmarc.provision.localMail.recipientName)
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'';
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};
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recipientName = lib.mkOption {
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type = lib.types.str;
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default = "dmarc";
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description = lib.mdDoc ''
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The DMARC mail recipient name, i.e. the name part of the
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email address which receives DMARC reports.
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A local user with this name will be set up and assigned a
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randomized password on service start.
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'';
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};
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hostname = lib.mkOption {
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type = lib.types.str;
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default = config.networking.fqdn;
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defaultText = lib.literalExpression "config.networking.fqdn";
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example = "monitoring.example.com";
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description = lib.mdDoc ''
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The hostname to use when configuring Postfix.
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Should correspond to the host's fully qualified domain
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name and the domain part of the email address which
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receives DMARC reports. You also have to set up an MX record
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pointing to this domain name.
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'';
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};
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};
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geoIp = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to enable and configure the [geoipupdate](#opt-services.geoipupdate.enable)
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service to automatically fetch GeoIP databases. Not crucial,
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but recommended for full functionality.
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To finish the setup, you need to manually set the [](#opt-services.geoipupdate.settings.AccountID) and
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[](#opt-services.geoipupdate.settings.LicenseKey)
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options.
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'';
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};
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elasticsearch = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to set up and use a local instance of Elasticsearch.
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'';
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};
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grafana = {
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datasource = lib.mkOption {
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type = lib.types.bool;
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default = cfg.provision.elasticsearch && config.services.grafana.enable;
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defaultText = lib.literalExpression ''
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config.${opt.provision.elasticsearch} && config.${options.services.grafana.enable}
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'';
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apply = x: x && cfg.provision.elasticsearch;
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description = lib.mdDoc ''
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Whether the automatically provisioned Elasticsearch
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instance should be added as a grafana datasource. Has no
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effect unless
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[](#opt-services.parsedmarc.provision.elasticsearch)
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is also enabled.
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'';
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};
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dashboard = lib.mkOption {
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type = lib.types.bool;
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default = config.services.grafana.enable;
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defaultText = lib.literalExpression "config.services.grafana.enable";
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description = lib.mdDoc ''
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Whether the official parsedmarc grafana dashboard should
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be provisioned to the local grafana instance.
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'';
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};
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};
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};
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settings = lib.mkOption {
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example = lib.literalExpression ''
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{
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imap = {
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host = "imap.example.com";
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user = "alice@example.com";
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password = { _secret = "/run/keys/imap_password" };
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watch = true;
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};
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splunk_hec = {
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url = "https://splunkhec.example.com";
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token = { _secret = "/run/keys/splunk_token" };
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index = "email";
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};
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}
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'';
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description = lib.mdDoc ''
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Configuration parameters to set in
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{file}`parsedmarc.ini`. For a full list of
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available parameters, see
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<https://domainaware.github.io/parsedmarc/#configuration-file>.
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Settings containing secret data should be set to an attribute
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set containing the attribute `_secret` - a
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string pointing to a file containing the value the option
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should be set to. See the example to get a better picture of
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this: in the resulting {file}`parsedmarc.ini`
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file, the `splunk_hec.token` key will be set
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to the contents of the
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{file}`/run/keys/splunk_token` file.
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'';
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type = lib.types.submodule {
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freeformType = ini.type;
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options = {
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general = {
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save_aggregate = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Save aggregate report data to Elasticsearch and/or Splunk.
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'';
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};
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save_forensic = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Save forensic report data to Elasticsearch and/or Splunk.
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'';
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};
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};
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imap = {
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host = lib.mkOption {
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type = lib.types.str;
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default = "localhost";
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description = lib.mdDoc ''
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The IMAP server hostname or IP address.
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'';
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};
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port = lib.mkOption {
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type = lib.types.port;
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default = 993;
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description = lib.mdDoc ''
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The IMAP server port.
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'';
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};
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ssl = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Use an encrypted SSL/TLS connection.
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'';
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};
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user = lib.mkOption {
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type = with lib.types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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The IMAP server username.
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'';
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};
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password = lib.mkOption {
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type = with lib.types; nullOr (either path (attrsOf path));
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default = null;
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description = lib.mdDoc ''
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The IMAP server password.
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Always handled as a secret whether the value is
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wrapped in a `{ _secret = ...; }`
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attrset or not (refer to [](#opt-services.parsedmarc.settings) for
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details).
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'';
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apply = x: if isAttrs x || x == null then x else { _secret = x; };
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};
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watch = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Use the IMAP IDLE command to process messages as they arrive.
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'';
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};
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delete = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = lib.mdDoc ''
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Delete messages after processing them, instead of archiving them.
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'';
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};
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};
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smtp = {
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host = lib.mkOption {
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type = with lib.types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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The SMTP server hostname or IP address.
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'';
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};
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port = lib.mkOption {
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type = with lib.types; nullOr port;
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default = null;
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description = lib.mdDoc ''
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The SMTP server port.
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'';
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};
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ssl = lib.mkOption {
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type = with lib.types; nullOr bool;
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default = null;
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description = lib.mdDoc ''
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Use an encrypted SSL/TLS connection.
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'';
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};
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user = lib.mkOption {
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type = with lib.types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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The SMTP server username.
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'';
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};
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password = lib.mkOption {
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type = with lib.types; nullOr (either path (attrsOf path));
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default = null;
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description = lib.mdDoc ''
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The SMTP server password.
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Always handled as a secret whether the value is
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wrapped in a `{ _secret = ...; }`
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attrset or not (refer to [](#opt-services.parsedmarc.settings) for
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details).
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'';
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apply = x: if isAttrs x || x == null then x else { _secret = x; };
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};
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from = lib.mkOption {
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type = with lib.types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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The `From` address to use for the
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outgoing mail.
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'';
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};
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to = lib.mkOption {
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type = with lib.types; nullOr (listOf str);
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default = null;
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description = lib.mdDoc ''
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The addresses to send outgoing mail to.
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'';
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};
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};
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elasticsearch = {
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hosts = lib.mkOption {
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default = [];
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type = with lib.types; listOf str;
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apply = x: if x == [] then null else lib.concatStringsSep "," x;
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description = lib.mdDoc ''
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A list of Elasticsearch hosts to push parsed reports
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to.
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'';
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};
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user = lib.mkOption {
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type = with lib.types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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Username to use when connecting to Elasticsearch, if
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required.
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'';
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};
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password = lib.mkOption {
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type = with lib.types; nullOr (either path (attrsOf path));
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default = null;
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description = lib.mdDoc ''
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The password to use when connecting to Elasticsearch,
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if required.
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Always handled as a secret whether the value is
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wrapped in a `{ _secret = ...; }`
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attrset or not (refer to [](#opt-services.parsedmarc.settings) for
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details).
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'';
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apply = x: if isAttrs x || x == null then x else { _secret = x; };
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};
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ssl = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether to use an encrypted SSL/TLS connection.
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'';
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};
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cert_path = lib.mkOption {
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type = lib.types.path;
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default = "/etc/ssl/certs/ca-certificates.crt";
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description = lib.mdDoc ''
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The path to a TLS certificate bundle used to verify
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the server's certificate.
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'';
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};
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};
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};
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};
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};
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};
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config = lib.mkIf cfg.enable {
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services.elasticsearch.enable = lib.mkDefault cfg.provision.elasticsearch;
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services.geoipupdate = lib.mkIf cfg.provision.geoIp {
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enable = true;
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settings = {
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EditionIDs = [
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"GeoLite2-ASN"
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"GeoLite2-City"
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"GeoLite2-Country"
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];
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DatabaseDirectory = "/var/lib/GeoIP";
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};
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};
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services.dovecot2 = lib.mkIf cfg.provision.localMail.enable {
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enable = true;
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protocols = [ "imap" ];
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};
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services.postfix = lib.mkIf cfg.provision.localMail.enable {
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enable = true;
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origin = cfg.provision.localMail.hostname;
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config = {
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myhostname = cfg.provision.localMail.hostname;
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mydestination = cfg.provision.localMail.hostname;
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};
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};
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services.grafana = {
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declarativePlugins = with pkgs.grafanaPlugins;
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lib.mkIf cfg.provision.grafana.dashboard [
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grafana-worldmap-panel
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grafana-piechart-panel
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];
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provision = {
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enable = cfg.provision.grafana.datasource || cfg.provision.grafana.dashboard;
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datasources =
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let
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esVersion = lib.getVersion config.services.elasticsearch.package;
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in
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lib.mkIf cfg.provision.grafana.datasource [
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{
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name = "dmarc-ag";
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type = "elasticsearch";
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access = "proxy";
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url = "http://localhost:9200";
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jsonData = {
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timeField = "date_range";
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inherit esVersion;
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};
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}
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{
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name = "dmarc-fo";
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type = "elasticsearch";
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access = "proxy";
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url = "http://localhost:9200";
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jsonData = {
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timeField = "date_range";
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inherit esVersion;
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};
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}
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];
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dashboards = lib.mkIf cfg.provision.grafana.dashboard [{
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name = "parsedmarc";
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options.path = "${pkgs.python3Packages.parsedmarc.dashboard}";
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}];
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};
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};
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services.parsedmarc.settings = lib.mkMerge [
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(lib.mkIf cfg.provision.elasticsearch {
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elasticsearch = {
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hosts = [ "localhost:9200" ];
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ssl = false;
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};
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})
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(lib.mkIf cfg.provision.localMail.enable {
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imap = {
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host = "localhost";
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port = 143;
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ssl = false;
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user = cfg.provision.localMail.recipientName;
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password = "${pkgs.writeText "imap-password" "@imap-password@"}";
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watch = true;
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};
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})
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];
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systemd.services.parsedmarc =
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let
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# Remove any empty attributes from the config, i.e. empty
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# lists, empty attrsets and null. This makes it possible to
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# list interesting options in `settings` without them always
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# ending up in the resulting config.
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filteredConfig = lib.converge (lib.filterAttrsRecursive (_: v: ! elem v [ null [] {} ])) cfg.settings;
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# Extract secrets (attributes set to an attrset with a
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# "_secret" key) from the settings and generate the commands
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# to run to perform the secret replacements.
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secretPaths = lib.catAttrs "_secret" (lib.collect isSecret filteredConfig);
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parsedmarcConfig = ini.generate "parsedmarc.ini" filteredConfig;
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mkSecretReplacement = file: ''
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replace-secret ${lib.escapeShellArgs [ (hashString "sha256" file) file "/run/parsedmarc/parsedmarc.ini" ]}
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'';
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secretReplacements = lib.concatMapStrings mkSecretReplacement secretPaths;
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in
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{
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wantedBy = [ "multi-user.target" ];
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after = [ "postfix.service" "dovecot2.service" "elasticsearch.service" ];
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path = with pkgs; [ replace-secret openssl shadow ];
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serviceConfig = {
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ExecStartPre = let
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startPreFullPrivileges = ''
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set -o errexit -o pipefail -o nounset -o errtrace
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shopt -s inherit_errexit
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umask u=rwx,g=,o=
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cp ${parsedmarcConfig} /run/parsedmarc/parsedmarc.ini
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chown parsedmarc:parsedmarc /run/parsedmarc/parsedmarc.ini
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${secretReplacements}
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'' + lib.optionalString cfg.provision.localMail.enable ''
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openssl rand -hex 64 >/run/parsedmarc/dmarc_user_passwd
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replace-secret '@imap-password@' '/run/parsedmarc/dmarc_user_passwd' /run/parsedmarc/parsedmarc.ini
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echo "Setting new randomized password for user '${cfg.provision.localMail.recipientName}'."
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cat <(echo -n "${cfg.provision.localMail.recipientName}:") /run/parsedmarc/dmarc_user_passwd | chpasswd
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'';
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in
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"+${pkgs.writeShellScript "parsedmarc-start-pre-full-privileges" startPreFullPrivileges}";
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Type = "simple";
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User = "parsedmarc";
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Group = "parsedmarc";
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DynamicUser = true;
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RuntimeDirectory = "parsedmarc";
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RuntimeDirectoryMode = 0700;
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CapabilityBoundingSet = "";
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PrivateDevices = true;
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PrivateMounts = true;
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PrivateUsers = true;
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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ProcSubset = "pid";
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SystemCallFilter = [ "@system-service" "~@privileged" "~@resources" ];
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RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
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RestrictRealtime = true;
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RestrictNamespaces = true;
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MemoryDenyWriteExecute = true;
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LockPersonality = true;
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SystemCallArchitectures = "native";
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ExecStart = "${pkgs.python3Packages.parsedmarc}/bin/parsedmarc -c /run/parsedmarc/parsedmarc.ini";
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};
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};
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users.users.${cfg.provision.localMail.recipientName} = lib.mkIf cfg.provision.localMail.enable {
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isNormalUser = true;
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description = "DMARC mail recipient";
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};
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};
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# Don't edit the docbook xml directly, edit the md and generate it:
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# `pandoc parsedmarc.md -t docbook --top-level-division=chapter --extract-media=media -f markdown+smart > parsedmarc.xml`
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meta.doc = ./parsedmarc.xml;
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meta.maintainers = [ lib.maintainers.talyz ];
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}
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