diff options
Diffstat (limited to 'nixos/modules/services/monitoring/parsedmarc.nix')
| -rw-r--r-- | nixos/modules/services/monitoring/parsedmarc.nix | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/nixos/modules/services/monitoring/parsedmarc.nix b/nixos/modules/services/monitoring/parsedmarc.nix new file mode 100644 index 000000000000..e6a72dea0260 --- /dev/null +++ b/nixos/modules/services/monitoring/parsedmarc.nix @@ -0,0 +1,537 @@ +{ config, lib, pkgs, ... }: + +let + cfg = config.services.parsedmarc; + ini = pkgs.formats.ini {}; +in +{ + options.services.parsedmarc = { + + enable = lib.mkEnableOption '' + parsedmarc, a DMARC report monitoring service + ''; + + provision = { + localMail = { + enable = lib.mkOption { + type = lib.types.bool; + default = false; + description = '' + Whether Postfix and Dovecot should be set up to receive + mail locally. parsedmarc will be configured to watch the + local inbox as the automatically created user specified in + <xref linkend="opt-services.parsedmarc.provision.localMail.recipientName" /> + ''; + }; + + recipientName = lib.mkOption { + type = lib.types.str; + default = "dmarc"; + description = '' + The DMARC mail recipient name, i.e. the name part of the + email address which receives DMARC reports. + + A local user with this name will be set up and assigned a + randomized password on service start. + ''; + }; + + hostname = lib.mkOption { + type = lib.types.str; + default = config.networking.fqdn; + defaultText = "config.networking.fqdn"; + example = "monitoring.example.com"; + description = '' + The hostname to use when configuring Postfix. + + Should correspond to the host's fully qualified domain + name and the domain part of the email address which + receives DMARC reports. You also have to set up an MX record + pointing to this domain name. + ''; + }; + }; + + geoIp = lib.mkOption { + type = lib.types.bool; + default = true; + description = '' + Whether to enable and configure the <link + linkend="opt-services.geoipupdate.enable">geoipupdate</link> + service to automatically fetch GeoIP databases. Not crucial, + but recommended for full functionality. + + To finish the setup, you need to manually set the <xref + linkend="opt-services.geoipupdate.settings.AccountID" /> and + <xref linkend="opt-services.geoipupdate.settings.LicenseKey" /> + options. + ''; + }; + + elasticsearch = lib.mkOption { + type = lib.types.bool; + default = true; + description = '' + Whether to set up and use a local instance of Elasticsearch. + ''; + }; + + grafana = { + datasource = lib.mkOption { + type = lib.types.bool; + default = cfg.provision.elasticsearch && config.services.grafana.enable; + apply = x: x && cfg.provision.elasticsearch; + description = '' + Whether the automatically provisioned Elasticsearch + instance should be added as a grafana datasource. Has no + effect unless + <xref linkend="opt-services.parsedmarc.provision.elasticsearch" /> + is also enabled. + ''; + }; + + dashboard = lib.mkOption { + type = lib.types.bool; + default = config.services.grafana.enable; + description = '' + Whether the official parsedmarc grafana dashboard should + be provisioned to the local grafana instance. + ''; + }; + }; + }; + + settings = lib.mkOption { + description = '' + Configuration parameters to set in + <filename>parsedmarc.ini</filename>. For a full list of + available parameters, see + <link xlink:href="https://domainaware.github.io/parsedmarc/#configuration-file" />. + ''; + + type = lib.types.submodule { + freeformType = ini.type; + + options = { + general = { + save_aggregate = lib.mkOption { + type = lib.types.bool; + default = true; + description = '' + Save aggregate report data to Elasticsearch and/or Splunk. + ''; + }; + + save_forensic = lib.mkOption { + type = lib.types.bool; + default = true; + description = '' + Save forensic report data to Elasticsearch and/or Splunk. + ''; + }; + }; + + imap = { + host = lib.mkOption { + type = lib.types.str; + default = "localhost"; + description = '' + The IMAP server hostname or IP address. + ''; + }; + + port = lib.mkOption { + type = lib.types.port; + default = 993; + description = '' + The IMAP server port. + ''; + }; + + ssl = lib.mkOption { + type = lib.types.bool; + default = true; + description = '' + Use an encrypted SSL/TLS connection. + ''; + }; + + user = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + description = '' + The IMAP server username. + ''; + }; + + password = lib.mkOption { + type = with lib.types; nullOr path; + default = null; + description = '' + The path to a file containing the IMAP server password. + ''; + }; + + watch = lib.mkOption { + type = lib.types.bool; + default = true; + description = '' + Use the IMAP IDLE command to process messages as they arrive. + ''; + }; + + delete = lib.mkOption { + type = lib.types.bool; + default = false; + description = '' + Delete messages after processing them, instead of archiving them. + ''; + }; + }; + + smtp = { + host = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + description = '' + The SMTP server hostname or IP address. + ''; + }; + + port = lib.mkOption { + type = with lib.types; nullOr port; + default = null; + description = '' + The SMTP server port. + ''; + }; + + ssl = lib.mkOption { + type = with lib.types; nullOr bool; + default = null; + description = '' + Use an encrypted SSL/TLS connection. + ''; + }; + + user = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + description = '' + The SMTP server username. + ''; + }; + + password = lib.mkOption { + type = with lib.types; nullOr path; + default = null; + description = '' + The path to a file containing the SMTP server password. + ''; + }; + + from = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + description = '' + The <literal>From</literal> address to use for the + outgoing mail. + ''; + }; + + to = lib.mkOption { + type = with lib.types; nullOr (listOf str); + default = null; + description = '' + The addresses to send outgoing mail to. + ''; + }; + }; + + elasticsearch = { + hosts = lib.mkOption { + default = []; + type = with lib.types; listOf str; + apply = x: if x == [] then null else lib.concatStringsSep "," x; + description = '' + A list of Elasticsearch hosts to push parsed reports + to. + ''; + }; + + user = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + description = '' + Username to use when connecting to Elasticsearch, if + required. + ''; + }; + + password = lib.mkOption { + type = with lib.types; nullOr path; + default = null; + description = '' + The path to a file containing the password to use when + connecting to Elasticsearch, if required. + ''; + }; + + ssl = lib.mkOption { + type = lib.types.bool; + default = false; + description = '' + Whether to use an encrypted SSL/TLS connection. + ''; + }; + + cert_path = lib.mkOption { + type = lib.types.path; + default = "/etc/ssl/certs/ca-certificates.crt"; + description = '' + The path to a TLS certificate bundle used to verify + the server's certificate. + ''; + }; + }; + + kafka = { + hosts = lib.mkOption { + default = []; + type = with lib.types; listOf str; + apply = x: if x == [] then null else lib.concatStringsSep "," x; + description = '' + A list of Apache Kafka hosts to publish parsed reports + to. + ''; + }; + + user = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + description = '' + Username to use when connecting to Kafka, if + required. + ''; + }; + + password = lib.mkOption { + type = with lib.types; nullOr path; + default = null; + description = '' + The path to a file containing the password to use when + connecting to Kafka, if required. + ''; + }; + + ssl = lib.mkOption { + type = with lib.types; nullOr bool; + default = null; + description = '' + Whether to use an encrypted SSL/TLS connection. + ''; + }; + + aggregate_topic = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + example = "aggregate"; + description = '' + The Kafka topic to publish aggregate reports on. + ''; + }; + + forensic_topic = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + example = "forensic"; + description = '' + The Kafka topic to publish forensic reports on. + ''; + }; + }; + + }; + + }; + }; + + }; + + config = lib.mkIf cfg.enable { + + services.elasticsearch.enable = lib.mkDefault cfg.provision.elasticsearch; + + services.geoipupdate = lib.mkIf cfg.provision.geoIp { + enable = true; + settings = { + EditionIDs = [ + "GeoLite2-ASN" + "GeoLite2-City" + "GeoLite2-Country" + ]; + DatabaseDirectory = "/var/lib/GeoIP"; + }; + }; + + services.dovecot2 = lib.mkIf cfg.provision.localMail.enable { + enable = true; + protocols = [ "imap" ]; + }; + + services.postfix = lib.mkIf cfg.provision.localMail.enable { + enable = true; + origin = cfg.provision.localMail.hostname; + config = { + myhostname = cfg.provision.localMail.hostname; + mydestination = cfg.provision.localMail.hostname; + }; + }; + + services.grafana = { + declarativePlugins = with pkgs.grafanaPlugins; + lib.mkIf cfg.provision.grafana.dashboard [ + grafana-worldmap-panel + grafana-piechart-panel + ]; + + provision = { + enable = cfg.provision.grafana.datasource || cfg.provision.grafana.dashboard; + datasources = + let + pkgVer = lib.getVersion config.services.elasticsearch.package; + esVersion = + if lib.versionOlder pkgVer "7" then + "60" + else if lib.versionOlder pkgVer "8" then + "70" + else + throw "When provisioning parsedmarc grafana datasources: unknown Elasticsearch version."; + in + lib.mkIf cfg.provision.grafana.datasource [ + { + name = "dmarc-ag"; + type = "elasticsearch"; + access = "proxy"; + url = "localhost:9200"; + jsonData = { + timeField = "date_range"; + inherit esVersion; + }; + } + { + name = "dmarc-fo"; + type = "elasticsearch"; + access = "proxy"; + url = "localhost:9200"; + jsonData = { + timeField = "date_range"; + inherit esVersion; + }; + } + ]; + dashboards = lib.mkIf cfg.provision.grafana.dashboard [{ + name = "parsedmarc"; + options.path = "${pkgs.python3Packages.parsedmarc.dashboard}"; + }]; + }; + }; + + services.parsedmarc.settings = lib.mkMerge [ + (lib.mkIf cfg.provision.elasticsearch { + elasticsearch = { + hosts = [ "localhost:9200" ]; + ssl = false; + }; + }) + (lib.mkIf cfg.provision.localMail.enable { + imap = { + host = "localhost"; + port = 143; + ssl = false; + user = cfg.provision.localMail.recipientName; + password = "${pkgs.writeText "imap-password" "@imap-password@"}"; + watch = true; + }; + }) + ]; + + systemd.services.parsedmarc = + let + # Remove any empty attributes from the config, i.e. empty + # lists, empty attrsets and null. This makes it possible to + # list interesting options in `settings` without them always + # ending up in the resulting config. + filteredConfig = lib.converge (lib.filterAttrsRecursive (_: v: ! builtins.elem v [ null [] {} ])) cfg.settings; + parsedmarcConfig = ini.generate "parsedmarc.ini" filteredConfig; + mkSecretReplacement = file: + lib.optionalString (file != null) '' + replace-secret '${file}' '${file}' /run/parsedmarc/parsedmarc.ini + ''; + in + { + wantedBy = [ "multi-user.target" ]; + after = [ "postfix.service" "dovecot2.service" "elasticsearch.service" ]; + path = with pkgs; [ replace-secret openssl shadow ]; + serviceConfig = { + ExecStartPre = let + startPreFullPrivileges = '' + set -o errexit -o pipefail -o nounset -o errtrace + shopt -s inherit_errexit + + umask u=rwx,g=,o= + cp ${parsedmarcConfig} /run/parsedmarc/parsedmarc.ini + chown parsedmarc:parsedmarc /run/parsedmarc/parsedmarc.ini + ${mkSecretReplacement cfg.settings.smtp.password} + ${mkSecretReplacement cfg.settings.imap.password} + ${mkSecretReplacement cfg.settings.elasticsearch.password} + ${mkSecretReplacement cfg.settings.kafka.password} + '' + lib.optionalString cfg.provision.localMail.enable '' + openssl rand -hex 64 >/run/parsedmarc/dmarc_user_passwd + replace-secret '@imap-password@' '/run/parsedmarc/dmarc_user_passwd' /run/parsedmarc/parsedmarc.ini + echo "Setting new randomized password for user '${cfg.provision.localMail.recipientName}'." + cat <(echo -n "${cfg.provision.localMail.recipientName}:") /run/parsedmarc/dmarc_user_passwd | chpasswd + ''; + in + "+${pkgs.writeShellScript "parsedmarc-start-pre-full-privileges" startPreFullPrivileges}"; + Type = "simple"; + User = "parsedmarc"; + Group = "parsedmarc"; + DynamicUser = true; + RuntimeDirectory = "parsedmarc"; + RuntimeDirectoryMode = 0700; + CapabilityBoundingSet = ""; + PrivateDevices = true; + PrivateMounts = true; + PrivateUsers = true; + ProtectClock = true; + ProtectControlGroups = true; + ProtectHome = true; + ProtectHostname = true; + ProtectKernelLogs = true; + ProtectKernelModules = true; + ProtectKernelTunables = true; + ProtectProc = "invisible"; + ProcSubset = "pid"; + SystemCallFilter = [ "@system-service" "~@privileged" "~@resources" ]; + RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ]; + RestrictRealtime = true; + RestrictNamespaces = true; + MemoryDenyWriteExecute = true; + LockPersonality = true; + SystemCallArchitectures = "native"; + ExecStart = "${pkgs.python3Packages.parsedmarc}/bin/parsedmarc -c /run/parsedmarc/parsedmarc.ini"; + }; + }; + + users.users.${cfg.provision.localMail.recipientName} = lib.mkIf cfg.provision.localMail.enable { + isNormalUser = true; + description = "DMARC mail recipient"; + }; + }; + + # Don't edit the docbook xml directly, edit the md and generate it: + # `pandoc parsedmarc.md -t docbook --top-level-division=chapter --extract-media=media -f markdown+smart > parsedmarc.xml` + meta.doc = ./parsedmarc.xml; + meta.maintainers = [ lib.maintainers.talyz ]; +} |