nixos/postfix: add slow domain (#381789) (65c5695a) · Commits · nix / nixpkgs

nixos/modules/services/mail/postfix.nix

+48 −4

Original line number	Diff line number	Diff line
		@@ -13,7 +13,7 @@ let

		haveAliases = cfg.postmasterAlias != "" \|\| cfg.rootAlias != "" \|\| cfg.extraAliases != "";
		haveCanonical = cfg.canonical != "";
		haveTransport = cfg.transport != "";
		haveTransport = cfg.transport != "" \|\| (cfg.enableSlowDomains && cfg.slowDomains != [ ]);
		haveVirtual = cfg.virtual != "";
		haveLocalRecipients = cfg.localRecipients != null;

		@@ -319,13 +319,20 @@ let
		aliasesFile = pkgs.writeText "postfix-aliases" aliases;
		canonicalFile = pkgs.writeText "postfix-canonical" cfg.canonical;
		virtualFile = pkgs.writeText "postfix-virtual" cfg.virtual;
		transportFile = pkgs.writeText "postfix-transport" (
		lib.optionalString (cfg.enableSlowDomains && cfg.slowDomains != [ ]) (
		lib.concatMapStrings (domain: ''
		${domain} slow:
		'') cfg.slowDomains
		)
		+ cfg.transport
		);
		localRecipientMapFile = pkgs.writeText "postfix-local-recipient-map" (
		lib.concatMapStrings (x: x + " ACCEPT\n") cfg.localRecipients
		);
		checkClientAccessFile = pkgs.writeText "postfix-check-client-access" cfg.dnsBlacklistOverrides;
		mainCfFile = pkgs.writeText "postfix-main.cf" mainCf;
		masterCfFile = pkgs.writeText "postfix-master.cf" masterCfContent;
		transportFile = pkgs.writeText "postfix-transport" cfg.transport;
		headerChecksFile = pkgs.writeText "postfix-header-checks" headerChecks;

		in
		@@ -550,6 +557,32 @@ in
		'';
		};

		enableSlowDomains = lib.mkEnableOption "slow domains feature for rate limiting specific domains";

		slowDomains = lib.mkOption {
		type = with lib.types; listOf str;
		default = [ ];
		example = [
		"orange.fr"
		"gmail.com"
		];
		description = "List of domains to be rate-limited using the slow transport.";
		};

		slowDomainsConfig = {
		defaultDestinationRateDelay = lib.mkOption {
		type = lib.types.str;
		default = "5s";
		description = "Default rate delay for destinations.";
		};

		defaultDestinationConcurrencyLimit = lib.mkOption {
		type = lib.types.int;
		default = 3;
		description = "Concurrency limit for slow destinations.";
		};
		};

		aliasMapType = lib.mkOption {
		type =
		with lib.types;
		@@ -985,7 +1018,10 @@ in
		smtpd_tls_key_file = cfg.sslKey;

		smtpd_tls_security_level = lib.mkDefault "may";

		}
		// lib.optionalAttrs cfg.enableSlowDomains {
		default_destination_rate_delay = cfg.slowDomainsConfig.defaultDestinationRateDelay;
		default_destination_concurrency_limit = cfg.slowDomainsConfig.defaultDestinationConcurrencyLimit;
		};

		services.postfix.masterConfig =
		@@ -1077,6 +1113,14 @@ in
		lib.concatLists (lib.mapAttrsToList mkKeyVal cfg.submissionOptions);
		};
		}
		// lib.optionalAttrs cfg.enableSlowDomains {
		slow = {
		command = "smtp";
		type = "unix";
		private = true;
		maxproc = 2;
		};
		}
		// lib.optionalAttrs cfg.enableSmtp {
		smtp_inet = {
		name = "smtp";
		@@ -1128,7 +1172,7 @@ in
		(lib.mkIf haveCanonical {
		services.postfix.mapFiles.canonical = canonicalFile;
		})
		(lib.mkIf haveTransport {
		(lib.mkIf (haveTransport \|\| (cfg.enableSlowDomains && cfg.slowDomains != [ ])) {
		services.postfix.mapFiles.transport = transportFile;
		})
		(lib.mkIf haveVirtual {