[perso/Immae/Config/Nix.git] / modules / private / mail / postfix.nix

{ lib, pkgs, config, nodes, ... }:
{
  config = lib.mkIf config.myServices.mail.enable {
    services.duplyBackup.profiles.mail.excludeFile = ''
      + /var/lib/postfix
      '';
    secrets.keys = [
      {
        dest = "postfix/mysql_alias_maps";
        user = config.services.postfix.user;
        group = config.services.postfix.group;
        permissions = "0440";
        text = ''
          # We need to specify that option to trigger ssl connection
          tls_ciphers = TLSv1.2
          user = ${config.myEnv.mail.postfix.mysql.user}
          password = ${config.myEnv.mail.postfix.mysql.password}
          hosts = unix:${config.myEnv.mail.postfix.mysql.socket}
          dbname = ${config.myEnv.mail.postfix.mysql.database}
          query = SELECT DISTINCT destination
            FROM forwardings_merge
            WHERE
              ((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
              AND active = 1
              AND '%s' NOT IN
              (
                SELECT source
                FROM forwardings_blacklisted
                WHERE source = '%s'
              ) UNION
              SELECT 'devnull@immae.eu'
              FROM forwardings_blacklisted
              WHERE source = '%s'
          '';
      }
      {
        dest = "postfix/mysql_mailbox_maps";
        user = config.services.postfix.user;
        group = config.services.postfix.group;
        permissions = "0440";
        text = ''
          # We need to specify that option to trigger ssl connection
          tls_ciphers = TLSv1.2
          user = ${config.myEnv.mail.postfix.mysql.user}
          password = ${config.myEnv.mail.postfix.mysql.password}
          hosts = unix:${config.myEnv.mail.postfix.mysql.socket}
          dbname = ${config.myEnv.mail.postfix.mysql.database}
          result_format = /%d/%u
          query = SELECT DISTINCT '%s'
            FROM mailboxes
            WHERE active = 1
            AND (
              (domain = '%d' AND user = '%u' AND regex = 0)
              OR (
                regex = 1
                AND '%d' REGEXP CONCAT('^',domain,'$')
                AND '%u' REGEXP CONCAT('^',user,'$')
              )
            )
            LIMIT 1
        '';
      }
      {
        dest = "postfix/mysql_sender_login_maps";
        user = config.services.postfix.user;
        group = config.services.postfix.group;
        permissions = "0440";
        text = ''
          # We need to specify that option to trigger ssl connection
          tls_ciphers = TLSv1.2
          user = ${config.myEnv.mail.postfix.mysql.user}
          password = ${config.myEnv.mail.postfix.mysql.password}
          hosts = unix:${config.myEnv.mail.postfix.mysql.socket}
          dbname = ${config.myEnv.mail.postfix.mysql.database}
          query = SELECT DISTINCT destination
            FROM forwardings_merge
            WHERE
              ((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
              AND active = 1
            UNION SELECT '%s' AS destination
          '';
      }
      {
        dest = "postfix/ldap_ejabberd_users_immae_fr";
        user = config.services.postfix.user;
        group = config.services.postfix.group;
        permissions = "0440";
        text = ''
          server_host = ldaps://${config.myEnv.jabber.ldap.host}:636
          search_base = ${config.myEnv.jabber.ldap.base}
          query_filter = ${config.myEnv.jabber.postfix_user_filter}
          domain = immae.fr
          bind_dn = ${config.myEnv.jabber.ldap.dn}
          bind_pw = ${config.myEnv.jabber.ldap.password}
          result_attribute = immaeXmppUid
          result_format = ejabberd@localhost
          version = 3
          '';
      }
    ];

    networking.firewall.allowedTCPPorts = [ 25 465 587 ];

    nixpkgs.overlays = [ (self: super: {
      postfix = super.postfix.override { withMySQL = true; };
    }) ];
    users.users."${config.services.postfix.user}".extraGroups = [ "keys" ];
    services.filesWatcher.postfix = {
      restart = true;
      paths = [
        config.secrets.fullPaths."postfix/mysql_alias_maps"
        config.secrets.fullPaths."postfix/mysql_mailbox_maps"
        config.secrets.fullPaths."postfix/mysql_sender_login_maps"
        config.secrets.fullPaths."postfix/ldap_ejabberd_users_immae_fr"
      ];
    };
    services.postfix = {
      extraAliases = let
        toScript = name: script: pkgs.writeScript name ''
          #! ${pkgs.stdenv.shell}
          mail=$(${pkgs.coreutils}/bin/cat -)
          output=$(echo "$mail" | ${script} 2>&1)
          ret=$?

          if [ "$ret" != "0" ]; then
            echo "$mail" \
              | ${pkgs.procmail}/bin/formail -i "X-Return-Code: $ret" \
              | /run/wrappers/bin/sendmail -i scripts_error+${name}@mail.immae.eu

          messageId=$(echo "$mail" | ${pkgs.procmail}/bin/formail -x "Message-Id:")
          repeat=$(echo "$mail" | ${pkgs.procmail}/bin/formail -X "From:" -X "Received:")

          ${pkgs.coreutils}/bin/cat <<EOF | /run/wrappers/bin/sendmail -i scripts_error+${name}@mail.immae.eu
          $repeat
          To: scripts_error+${name}@mail.immae.eu
          Subject: Log from script error
          Content-Type: text/plain; charset="UTF-8"
          Content-Transfer-Encoding: 8bit
          References:$messageId
          MIME-Version: 1.0
          X-Return-Code: $ret

          Error code: $ret
          Output of message:
          --------------
          $output
          --------------
          EOF
          fi
          '';
        scripts = lib.attrsets.mapAttrs (n: v:
          toScript n (pkgs.callPackage (builtins.fetchGit { url = v.src.url; ref = "master"; rev = v.src.rev; }) { scriptEnv = v.env; })
        ) config.myEnv.mail.scripts;
      in builtins.concatStringsSep "\n" (lib.attrsets.mapAttrsToList (n: v: ''${n}: "|${v}"'') scripts);
      mapFiles = let
        recipient_maps = let
          name = n: i: "relay_${n}_${toString i}";
          pair = n: i: m: lib.attrsets.nameValuePair (name n i) (
            if m.type == "hash"
            then pkgs.writeText (name n i) m.content
            else null
          );
          pairs = n: v: lib.imap1 (i: m: pair n i m) v.recipient_maps;
        in lib.attrsets.filterAttrs (k: v: v != null) (
          lib.attrsets.listToAttrs (lib.flatten (
            lib.attrsets.mapAttrsToList pairs config.myEnv.mail.postfix.backup_domains
          ))
        );
        relay_restrictions = lib.attrsets.filterAttrs (k: v: v != null) (
          lib.attrsets.mapAttrs' (n: v:
            lib.attrsets.nameValuePair "recipient_access_${n}" (
              if lib.attrsets.hasAttr "relay_restrictions" v
              then pkgs.writeText "recipient_access_${n}" v.relay_restrictions
              else null
            )
          ) config.myEnv.mail.postfix.backup_domains
        );
        virtual_map = {
          virtual = pkgs.writeText "postfix-virtual" (
            builtins.concatStringsSep "\n" (
              lib.attrsets.mapAttrsToList (
                n: v: lib.optionalString v.external ''
                  script_${n}@mail.immae.eu ${n}@localhost, scripts@mail.immae.eu
                ''
              ) config.myEnv.mail.scripts
            )
          );
        };
        sasl_access = {
          host_sender_login = pkgs.writeText "host-sender-login"
            (builtins.concatStringsSep "\n" (lib.flatten (lib.attrsets.mapAttrsToList
            (n: v: (map (e: "${e}  ${n}@immae.eu") v.emails)) config.myEnv.servers)));
          host_dummy_mailboxes = pkgs.writeText "host-virtual-mailbox"
            (builtins.concatStringsSep "\n" (lib.attrsets.mapAttrsToList (n: v: "${n}@immae.eu  dummy") nodes));
        };
      in
        recipient_maps // relay_restrictions // virtual_map // sasl_access;
      config = {
        ### postfix module overrides
        readme_directory = "${pkgs.postfix}/share/postfix/doc";
        smtp_tls_CAfile = lib.mkForce "";
        smtp_tls_cert_file = lib.mkForce "";
        smtp_tls_key_file = lib.mkForce "";

        message_size_limit = "1073741824"; # Don't put 0 here, it's not equivalent to "unlimited"
        mailbox_size_limit = "1073741825"; # Workaround, local delivered mails should all go through scripts
        alias_database = "\$alias_maps";

        ### Virtual mailboxes config
        virtual_alias_maps = "hash:/etc/postfix/virtual mysql:${config.secrets.fullPaths."postfix/mysql_alias_maps"} ldap:${config.secrets.fullPaths."postfix/ldap_ejabberd_users_immae_fr"}";
        virtual_mailbox_domains = config.myEnv.mail.postfix.additional_mailbox_domains
        ++ lib.remove "localhost.immae.eu" (lib.remove null (lib.flatten (map
            (zone: map
              (e: if e.receive
              then "${e.domain}${lib.optionalString (e.domain != "") "."}${zone.name}"
              else null
              )
              (zone.withEmail or [])
            )
            config.myEnv.dns.masterZones
          )));
        virtual_mailbox_maps = "hash:/etc/postfix/host_dummy_mailboxes mysql:${config.secrets.fullPaths."postfix/mysql_mailbox_maps"}";
        dovecot_destination_recipient_limit = "1";
        virtual_transport = "dovecot";

        ### Relay domains
        relay_domains = lib.flatten (lib.attrsets.mapAttrsToList (n: v: v.domains or []) config.myEnv.mail.postfix.backup_domains);
        relay_recipient_maps = lib.flatten (lib.attrsets.mapAttrsToList (n: v:
          lib.imap1 (i: m: "${m.type}:/etc/postfix/relay_${n}_${toString i}") v.recipient_maps
        ) config.myEnv.mail.postfix.backup_domains);
        smtpd_relay_restrictions = [
          "permit_mynetworks"
          "permit_sasl_authenticated"
          "defer_unauth_destination"
        ] ++ lib.flatten (lib.attrsets.mapAttrsToList (n: v:
          if lib.attrsets.hasAttr "relay_restrictions" v
          then [ "check_recipient_access hash:/etc/postfix/recipient_access_${n}" ]
          else []
        ) config.myEnv.mail.postfix.backup_domains);

        ### Additional smtpd configuration
        smtpd_tls_received_header = "yes";
        smtpd_tls_loglevel = "1";

        ### Email sending configuration
        smtp_tls_security_level = "may";
        smtp_tls_loglevel = "1";

        ### Force ip bind for smtp
        smtp_bind_address  = config.myEnv.servers.eldiron.ips.main.ip4;
        smtp_bind_address6 = builtins.head config.myEnv.servers.eldiron.ips.main.ip6;

        # #Unneeded if postfix can only send e-mail from "self" domains
        # #smtp_sasl_auth_enable = "yes";
        # #smtp_sasl_password_maps = "hash:/etc/postfix/relay_creds";
        # #smtp_sasl_security_options = "noanonymous";
        # #smtp_sender_dependent_authentication = "yes";
        # #sender_dependent_relayhost_maps = "hash:/etc/postfix/sender_relay";

        ### opendkim, opendmarc, openarc milters
        non_smtpd_milters = [
          "unix:${config.myServices.mail.milters.sockets.opendkim}"
          "unix:${config.myServices.mail.milters.sockets.opendmarc}"
          "unix:${config.myServices.mail.milters.sockets.openarc}"
        ];
        smtpd_milters = [
          "unix:${config.myServices.mail.milters.sockets.opendkim}"
          "unix:${config.myServices.mail.milters.sockets.opendmarc}"
          "unix:${config.myServices.mail.milters.sockets.openarc}"
        ];
      };
      enable = true;
      enableSmtp = true;
      enableSubmission = true;
      submissionOptions = {
        smtpd_tls_security_level = "encrypt";
        smtpd_sasl_auth_enable = "yes";
        smtpd_tls_auth_only = "yes";
        smtpd_sasl_tls_security_options = "noanonymous";
        smtpd_sasl_type = "dovecot";
        smtpd_sasl_path = "private/auth";
        smtpd_reject_unlisted_recipient = "no";
        smtpd_client_restrictions = "permit_sasl_authenticated,reject";
        # Refuse to send e-mails with a From that is not handled
        smtpd_sender_restrictions =
          "reject_sender_login_mismatch,reject_unlisted_sender,permit_sasl_authenticated,reject";
        smtpd_sender_login_maps = "hash:/etc/postfix/host_sender_login,mysql:${config.secrets.fullPaths."postfix/mysql_sender_login_maps"}";
        smtpd_recipient_restrictions = "permit_sasl_authenticated,reject";
        milter_macro_daemon_name = "ORIGINATING";
        smtpd_milters = "unix:${config.myServices.mail.milters.sockets.opendkim}";
      };
      # FIXME: Mail adressed to localhost.immae.eu will still have mx-1 as
      # prioritized MX, which provokes "mail for localhost.immae.eu loops
      # back to myself" errors. This transport entry forces to push
      # e-mails to its right destination.
      transport = ''
        localhost.immae.eu   smtp:[immae.eu]:25
        '';
      destination = ["localhost"];
      # This needs to reverse DNS
      hostname = "eldiron.immae.eu";
      setSendmail = true;
      sslCert = "/var/lib/acme/mail/fullchain.pem";
      sslKey = "/var/lib/acme/mail/key.pem";
      recipientDelimiter = "+";
      masterConfig = {
        submissions = {
          type = "inet";
          private = false;
          command = "smtpd";
          args = ["-o" "smtpd_tls_wrappermode=yes" ] ++ (let
            mkKeyVal = opt: val: [ "-o" (opt + "=" + val) ];
          in lib.concatLists (lib.mapAttrsToList mkKeyVal config.services.postfix.submissionOptions)
          );
        };
        dovecot = {
          type = "unix";
          privileged = true;
          chroot = false;
          command = "pipe";
          args = let
            # rspamd could be used as a milter, but then it cannot apply
            # its checks "per user" (milter is not yet dispatched to
            # users), so we wrap dovecot-lda inside rspamc per recipient
            # here.
            rspamc_dovecot = pkgs.writeScriptBin "rspamc_dovecot" ''
              #! ${pkgs.stdenv.shell}
              sender="$1"
              original_recipient="$2"
              user="$3"

              ${pkgs.coreutils}/bin/cat - | \
                (${pkgs.rspamd}/bin/rspamc -h ${config.myServices.mail.rspamd.sockets.worker-controller} -c bayes -d "$user" --mime || true) | \
                ${pkgs.dovecot}/libexec/dovecot/dovecot-lda -f "$sender" -a "$original_recipient" -d "$user"
              '';
          in [
            "flags=DRhu" "user=vhost:vhost"
            "argv=${rspamc_dovecot}/bin/rspamc_dovecot \${sender} \${original_recipient} \${user}@\${nexthop}"
          ];
        };
      };
    };
    security.acme.certs."mail" = {
      postRun = ''
        systemctl restart postfix.service
        '';
      extraDomains = {
        "smtp.immae.eu" = null;
      };
    };
  };
}
Commit	Line	Data
deca5e9b	1	{ lib, pkgs, config, nodes, ... }:
a929614f	2	{
8415083e	3	config = lib.mkIf config.myServices.mail.enable {
d2e703c5	4	services.duplyBackup.profiles.mail.excludeFile = ''
8415083e IB	5	+ /var/lib/postfix
	6	'';
	7	secrets.keys = [
	8	{
	9	dest = "postfix/mysql_alias_maps";
	10	user = config.services.postfix.user;
	11	group = config.services.postfix.group;
	12	permissions = "0440";
	13	text = ''
	14	# We need to specify that option to trigger ssl connection
	15	tls_ciphers = TLSv1.2
ab8f306d IB	16	user = ${config.myEnv.mail.postfix.mysql.user}
	17	password = ${config.myEnv.mail.postfix.mysql.password}
	18	hosts = unix:${config.myEnv.mail.postfix.mysql.socket}
	19	dbname = ${config.myEnv.mail.postfix.mysql.database}
8415083e IB	20	query = SELECT DISTINCT destination
	21	FROM forwardings_merge
	22	WHERE
	23	((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
	24	AND active = 1
	25	AND '%s' NOT IN
	26	(
	27	SELECT source
	28	FROM forwardings_blacklisted
	29	WHERE source = '%s'
	30	) UNION
	31	SELECT 'devnull@immae.eu'
a929614f IB	32	FROM forwardings_blacklisted
a929614f IB	33	WHERE source = '%s'
8415083e IB	34	'';
	35	}
	36	{
	37	dest = "postfix/mysql_mailbox_maps";
	38	user = config.services.postfix.user;
	39	group = config.services.postfix.group;
	40	permissions = "0440";
	41	text = ''
	42	# We need to specify that option to trigger ssl connection
	43	tls_ciphers = TLSv1.2
ab8f306d IB	44	user = ${config.myEnv.mail.postfix.mysql.user}
	45	password = ${config.myEnv.mail.postfix.mysql.password}
	46	hosts = unix:${config.myEnv.mail.postfix.mysql.socket}
	47	dbname = ${config.myEnv.mail.postfix.mysql.database}
8415083e IB	48	result_format = /%d/%u
	49	query = SELECT DISTINCT '%s'
	50	FROM mailboxes
	51	WHERE active = 1
	52	AND (
	53	(domain = '%d' AND user = '%u' AND regex = 0)
	54	OR (
	55	regex = 1
	56	AND '%d' REGEXP CONCAT('^',domain,'$')
	57	AND '%u' REGEXP CONCAT('^',user,'$')
	58	)
a929614f	59	)
8415083e	60	LIMIT 1
a929614f	61	'';
8415083e IB	62	}
	63	{
	64	dest = "postfix/mysql_sender_login_maps";
	65	user = config.services.postfix.user;
	66	group = config.services.postfix.group;
	67	permissions = "0440";
	68	text = ''
	69	# We need to specify that option to trigger ssl connection
	70	tls_ciphers = TLSv1.2
ab8f306d IB	71	user = ${config.myEnv.mail.postfix.mysql.user}
	72	password = ${config.myEnv.mail.postfix.mysql.password}
	73	hosts = unix:${config.myEnv.mail.postfix.mysql.socket}
	74	dbname = ${config.myEnv.mail.postfix.mysql.database}
8415083e IB	75	query = SELECT DISTINCT destination
	76	FROM forwardings_merge
	77	WHERE
	78	((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
	79	AND active = 1
	80	UNION SELECT '%s' AS destination
	81	'';
	82	}
5b53d86f IB	83	{
	84	dest = "postfix/ldap_ejabberd_users_immae_fr";
	85	user = config.services.postfix.user;
	86	group = config.services.postfix.group;
	87	permissions = "0440";
	88	text = ''
	89	server_host = ldaps://${config.myEnv.jabber.ldap.host}:636
	90	search_base = ${config.myEnv.jabber.ldap.base}
	91	query_filter = ${config.myEnv.jabber.postfix_user_filter}
	92	domain = immae.fr
	93	bind_dn = ${config.myEnv.jabber.ldap.dn}
	94	bind_pw = ${config.myEnv.jabber.ldap.password}
	95	result_attribute = immaeXmppUid
	96	result_format = ejabberd@localhost
	97	version = 3
	98	'';
	99	}
8415083e	100	];
a929614f	101
8415083e	102	networking.firewall.allowedTCPPorts = [ 25 465 587 ];
a929614f	103
8415083e IB	104	nixpkgs.overlays = [ (self: super: {
	105	postfix = super.postfix.override { withMySQL = true; };
	106	}) ];
	107	users.users."${config.services.postfix.user}".extraGroups = [ "keys" ];
	108	services.filesWatcher.postfix = {
	109	restart = true;
	110	paths = [
	111	config.secrets.fullPaths."postfix/mysql_alias_maps"
	112	config.secrets.fullPaths."postfix/mysql_mailbox_maps"
	113	config.secrets.fullPaths."postfix/mysql_sender_login_maps"
5b53d86f	114	config.secrets.fullPaths."postfix/ldap_ejabberd_users_immae_fr"
8415083e IB	115	];
	116	};
	117	services.postfix = {
2a61e9da IB	118	extraAliases = let
	119	toScript = name: script: pkgs.writeScript name ''
	120	#! ${pkgs.stdenv.shell}
	121	mail=$(${pkgs.coreutils}/bin/cat -)
	122	output=$(echo "$mail" \| ${script} 2>&1)
	123	ret=$?
	124
	125	if [ "$ret" != "0" ]; then
	126	echo "$mail" \
	127	\| ${pkgs.procmail}/bin/formail -i "X-Return-Code: $ret" \
	128	\| /run/wrappers/bin/sendmail -i scripts_error+${name}@mail.immae.eu
	129
	130	messageId=$(echo "$mail" \| ${pkgs.procmail}/bin/formail -x "Message-Id:")
	131	repeat=$(echo "$mail" \| ${pkgs.procmail}/bin/formail -X "From:" -X "Received:")
	132
	133	${pkgs.coreutils}/bin/cat <<EOF \| /run/wrappers/bin/sendmail -i scripts_error+${name}@mail.immae.eu
	134	$repeat
	135	To: scripts_error+${name}@mail.immae.eu
	136	Subject: Log from script error
	137	Content-Type: text/plain; charset="UTF-8"
	138	Content-Transfer-Encoding: 8bit
	139	References:$messageId
	140	MIME-Version: 1.0
	141	X-Return-Code: $ret
	142
	143	Error code: $ret
	144	Output of message:
	145	--------------
	146	$output
	147	--------------
	148	EOF
	149	fi
	150	'';
	151	scripts = lib.attrsets.mapAttrs (n: v:
	152	toScript n (pkgs.callPackage (builtins.fetchGit { url = v.src.url; ref = "master"; rev = v.src.rev; }) { scriptEnv = v.env; })
ab8f306d	153	) config.myEnv.mail.scripts;
2a61e9da	154	in builtins.concatStringsSep "\n" (lib.attrsets.mapAttrsToList (n: v: ''${n}: "\|${v}"'') scripts);
8415083e IB	155	mapFiles = let
	156	recipient_maps = let
	157	name = n: i: "relay_${n}_${toString i}";
	158	pair = n: i: m: lib.attrsets.nameValuePair (name n i) (
	159	if m.type == "hash"
	160	then pkgs.writeText (name n i) m.content
04b2ab97	161	else null
8415083e IB	162	);
	163	pairs = n: v: lib.imap1 (i: m: pair n i m) v.recipient_maps;
	164	in lib.attrsets.filterAttrs (k: v: v != null) (
	165	lib.attrsets.listToAttrs (lib.flatten (
ab8f306d	166	lib.attrsets.mapAttrsToList pairs config.myEnv.mail.postfix.backup_domains
8415083e IB	167	))
	168	);
	169	relay_restrictions = lib.attrsets.filterAttrs (k: v: v != null) (
	170	lib.attrsets.mapAttrs' (n: v:
	171	lib.attrsets.nameValuePair "recipient_access_${n}" (
	172	if lib.attrsets.hasAttr "relay_restrictions" v
	173	then pkgs.writeText "recipient_access_${n}" v.relay_restrictions
	174	else null
	175	)
ab8f306d	176	) config.myEnv.mail.postfix.backup_domains
8415083e	177	);
2a61e9da IB	178	virtual_map = {
	179	virtual = pkgs.writeText "postfix-virtual" (
	180	builtins.concatStringsSep "\n" (
	181	lib.attrsets.mapAttrsToList (
5b53d86f	182	n: v: lib.optionalString v.external ''
2a61e9da IB	183	script_${n}@mail.immae.eu ${n}@localhost, scripts@mail.immae.eu
2a61e9da IB	184	''
ab8f306d	185	) config.myEnv.mail.scripts
2a61e9da IB	186	)
	187	);
	188	};
deca5e9b IB	189	sasl_access = {
	190	host_sender_login = pkgs.writeText "host-sender-login"
	191	(builtins.concatStringsSep "\n" (lib.flatten (lib.attrsets.mapAttrsToList
	192	(n: v: (map (e: "${e} ${n}@immae.eu") v.emails)) config.myEnv.servers)));
	193	host_dummy_mailboxes = pkgs.writeText "host-virtual-mailbox"
	194	(builtins.concatStringsSep "\n" (lib.attrsets.mapAttrsToList (n: v: "${n}@immae.eu dummy") nodes));
	195	};
8415083e	196	in
deca5e9b	197	recipient_maps // relay_restrictions // virtual_map // sasl_access;
8415083e IB	198	config = {
	199	### postfix module overrides
	200	readme_directory = "${pkgs.postfix}/share/postfix/doc";
	201	smtp_tls_CAfile = lib.mkForce "";
	202	smtp_tls_cert_file = lib.mkForce "";
	203	smtp_tls_key_file = lib.mkForce "";
a929614f	204
8415083e	205	message_size_limit = "1073741824"; # Don't put 0 here, it's not equivalent to "unlimited"
2a61e9da	206	mailbox_size_limit = "1073741825"; # Workaround, local delivered mails should all go through scripts
8415083e	207	alias_database = "\$alias_maps";
a929614f	208
8415083e	209	### Virtual mailboxes config
5b53d86f	210	virtual_alias_maps = "hash:/etc/postfix/virtual mysql:${config.secrets.fullPaths."postfix/mysql_alias_maps"} ldap:${config.secrets.fullPaths."postfix/ldap_ejabberd_users_immae_fr"}";
ab8f306d	211	virtual_mailbox_domains = config.myEnv.mail.postfix.additional_mailbox_domains
8415083e IB	212	++ lib.remove "localhost.immae.eu" (lib.remove null (lib.flatten (map
	213	(zone: map
	214	(e: if e.receive
	215	then "${e.domain}${lib.optionalString (e.domain != "") "."}${zone.name}"
	216	else null
	217	)
	218	(zone.withEmail or [])
a929614f	219	)
ab8f306d	220	config.myEnv.dns.masterZones
8415083e	221	)));
deca5e9b	222	virtual_mailbox_maps = "hash:/etc/postfix/host_dummy_mailboxes mysql:${config.secrets.fullPaths."postfix/mysql_mailbox_maps"}";
8415083e IB	223	dovecot_destination_recipient_limit = "1";
8415083e IB	224	virtual_transport = "dovecot";
a929614f	225
8415083e	226	### Relay domains
ab8f306d	227	relay_domains = lib.flatten (lib.attrsets.mapAttrsToList (n: v: v.domains or []) config.myEnv.mail.postfix.backup_domains);
8415083e IB	228	relay_recipient_maps = lib.flatten (lib.attrsets.mapAttrsToList (n: v:
8415083e IB	229	lib.imap1 (i: m: "${m.type}:/etc/postfix/relay_${n}_${toString i}") v.recipient_maps
ab8f306d	230	) config.myEnv.mail.postfix.backup_domains);
8415083e IB	231	smtpd_relay_restrictions = [
	232	"permit_mynetworks"
	233	"permit_sasl_authenticated"
	234	"defer_unauth_destination"
	235	] ++ lib.flatten (lib.attrsets.mapAttrsToList (n: v:
	236	if lib.attrsets.hasAttr "relay_restrictions" v
	237	then [ "check_recipient_access hash:/etc/postfix/recipient_access_${n}" ]
	238	else []
ab8f306d	239	) config.myEnv.mail.postfix.backup_domains);
a929614f	240
8415083e IB	241	### Additional smtpd configuration
	242	smtpd_tls_received_header = "yes";
	243	smtpd_tls_loglevel = "1";
a929614f	244
8415083e IB	245	### Email sending configuration
	246	smtp_tls_security_level = "may";
	247	smtp_tls_loglevel = "1";
a929614f	248
8415083e	249	### Force ip bind for smtp
ab8f306d IB	250	smtp_bind_address = config.myEnv.servers.eldiron.ips.main.ip4;
ab8f306d IB	251	smtp_bind_address6 = builtins.head config.myEnv.servers.eldiron.ips.main.ip6;
a929614f	252
8415083e IB	253	# #Unneeded if postfix can only send e-mail from "self" domains
	254	# #smtp_sasl_auth_enable = "yes";
	255	# #smtp_sasl_password_maps = "hash:/etc/postfix/relay_creds";
	256	# #smtp_sasl_security_options = "noanonymous";
	257	# #smtp_sender_dependent_authentication = "yes";
	258	# #sender_dependent_relayhost_maps = "hash:/etc/postfix/sender_relay";
a929614f	259
8415083e IB	260	### opendkim, opendmarc, openarc milters
	261	non_smtpd_milters = [
	262	"unix:${config.myServices.mail.milters.sockets.opendkim}"
	263	"unix:${config.myServices.mail.milters.sockets.opendmarc}"
	264	"unix:${config.myServices.mail.milters.sockets.openarc}"
	265	];
	266	smtpd_milters = [
	267	"unix:${config.myServices.mail.milters.sockets.opendkim}"
	268	"unix:${config.myServices.mail.milters.sockets.opendmarc}"
	269	"unix:${config.myServices.mail.milters.sockets.openarc}"
a929614f IB	270	];
a929614f IB	271	};
8415083e IB	272	enable = true;
	273	enableSmtp = true;
	274	enableSubmission = true;
	275	submissionOptions = {
	276	smtpd_tls_security_level = "encrypt";
	277	smtpd_sasl_auth_enable = "yes";
	278	smtpd_tls_auth_only = "yes";
	279	smtpd_sasl_tls_security_options = "noanonymous";
	280	smtpd_sasl_type = "dovecot";
	281	smtpd_sasl_path = "private/auth";
	282	smtpd_reject_unlisted_recipient = "no";
	283	smtpd_client_restrictions = "permit_sasl_authenticated,reject";
	284	# Refuse to send e-mails with a From that is not handled
	285	smtpd_sender_restrictions =
	286	"reject_sender_login_mismatch,reject_unlisted_sender,permit_sasl_authenticated,reject";
deca5e9b	287	smtpd_sender_login_maps = "hash:/etc/postfix/host_sender_login,mysql:${config.secrets.fullPaths."postfix/mysql_sender_login_maps"}";
8415083e IB	288	smtpd_recipient_restrictions = "permit_sasl_authenticated,reject";
	289	milter_macro_daemon_name = "ORIGINATING";
	290	smtpd_milters = "unix:${config.myServices.mail.milters.sockets.opendkim}";
	291	};
	292	# FIXME: Mail adressed to localhost.immae.eu will still have mx-1 as
	293	# prioritized MX, which provokes "mail for localhost.immae.eu loops
	294	# back to myself" errors. This transport entry forces to push
	295	# e-mails to its right destination.
	296	transport = ''
	297	localhost.immae.eu smtp:[immae.eu]:25
	298	'';
	299	destination = ["localhost"];
	300	# This needs to reverse DNS
	301	hostname = "eldiron.immae.eu";
	302	setSendmail = true;
	303	sslCert = "/var/lib/acme/mail/fullchain.pem";
	304	sslKey = "/var/lib/acme/mail/key.pem";
	305	recipientDelimiter = "+";
	306	masterConfig = {
	307	submissions = {
	308	type = "inet";
	309	private = false;
	310	command = "smtpd";
	311	args = ["-o" "smtpd_tls_wrappermode=yes" ] ++ (let
	312	mkKeyVal = opt: val: [ "-o" (opt + "=" + val) ];
	313	in lib.concatLists (lib.mapAttrsToList mkKeyVal config.services.postfix.submissionOptions)
	314	);
	315	};
	316	dovecot = {
	317	type = "unix";
	318	privileged = true;
	319	chroot = false;
	320	command = "pipe";
	321	args = let
	322	# rspamd could be used as a milter, but then it cannot apply
	323	# its checks "per user" (milter is not yet dispatched to
	324	# users), so we wrap dovecot-lda inside rspamc per recipient
	325	# here.
dc6d3af9 IB	326	rspamc_dovecot = pkgs.writeScriptBin "rspamc_dovecot" ''
	327	#! ${pkgs.stdenv.shell}
	328	sender="$1"
	329	original_recipient="$2"
	330	user="$3"
	331
	332	${pkgs.coreutils}/bin/cat - \| \
	333	(${pkgs.rspamd}/bin/rspamc -h ${config.myServices.mail.rspamd.sockets.worker-controller} -c bayes -d "$user" --mime \|\| true) \| \
	334	${pkgs.dovecot}/libexec/dovecot/dovecot-lda -f "$sender" -a "$original_recipient" -d "$user"
	335	'';
8415083e IB	336	in [
8415083e IB	337	"flags=DRhu" "user=vhost:vhost"
dc6d3af9	338	"argv=${rspamc_dovecot}/bin/rspamc_dovecot \${sender} \${original_recipient} \${user}@\${nexthop}"
8415083e IB	339	];
	340	};
	341	};
a929614f	342	};
8415083e IB	343	security.acme.certs."mail" = {
	344	postRun = ''
	345	systemctl restart postfix.service
	346	'';
	347	extraDomains = {
	348	"smtp.immae.eu" = null;
	349	};
a929614f IB	350	};
	351	};
	352	}