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

{ lib, pkgs, config, myconfig,  ... }:
{
  config.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 = ${myconfig.env.mail.postfix.mysql.user}
        password = ${myconfig.env.mail.postfix.mysql.password}
        hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
        dbname = ${myconfig.env.mail.postfix.mysql.database}
        query = SELECT DISTINCT destination
          FROM forwardings_merge
          WHERE
            ((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) 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 = ${myconfig.env.mail.postfix.mysql.user}
        password = ${myconfig.env.mail.postfix.mysql.password}
        hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
        dbname = ${myconfig.env.mail.postfix.mysql.database}
        result_format = /%d/%u
        query = SELECT DISTINCT '%s'
          FROM mailboxes
          WHERE active = 1
          AND (
            (domain = '%d' AND user = '%u' AND regex = 0)
            OR (
              regex = 1
              AND '%d' REGEXP CONCAT('^',domain,'$')
              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 = ${myconfig.env.mail.postfix.mysql.user}
        password = ${myconfig.env.mail.postfix.mysql.password}
        hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
        dbname = ${myconfig.env.mail.postfix.mysql.database}
        query = SELECT DISTINCT destination
          FROM forwardings_merge
          WHERE
            ((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
            AND active = 1
        '';
    }
  ];

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

  config.nixpkgs.overlays = [ (self: super: {
    postfix = super.postfix.override { withMySQL = true; };
  }) ];
  config.users.users."${config.services.postfix.user}".extraGroups = [ "keys" ];
  config.services.filesWatcher.postfix = {
    restart = true;
    paths = [
      config.secrets.fullPaths."postfix/mysql_alias_maps"
      config.secrets.fullPaths."postfix/mysql_mailbox_maps"
      config.secrets.fullPaths."postfix/mysql_sender_login_maps"
    ];
  };
  config.services.postfix = {
    mapFiles = let
      recipient_maps = let
        name = n: i: "relay_${n}_${toString i}";
        pair = n: i: m: lib.attrsets.nameValuePair (name n i) (
          if m.type == "hash"
          then pkgs.writeText (name n i) m.content
          else null
        );
        pairs = n: v: lib.imap1 (i: m: pair n i m) v.recipient_maps;
      in lib.attrsets.filterAttrs (k: v: v != null) (
        lib.attrsets.listToAttrs (lib.flatten (
          lib.attrsets.mapAttrsToList pairs myconfig.env.mail.postfix.backup_domains
        ))
      );
      relay_restrictions = lib.attrsets.filterAttrs (k: v: v != null) (
        lib.attrsets.mapAttrs' (n: v:
          lib.attrsets.nameValuePair "recipient_access_${n}" (
            if lib.attrsets.hasAttr "relay_restrictions" v
            then pkgs.writeText "recipient_access_${n}" v.relay_restrictions
            else null
          )
        ) myconfig.env.mail.postfix.backup_domains
      );
    in
      recipient_maps // relay_restrictions;
    config = {
      ### postfix module overrides
      readme_directory = "${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"
      alias_database = "\$alias_maps";

      ### Virtual mailboxes config
      virtual_alias_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_alias_maps"}";
      virtual_mailbox_domains = myconfig.env.mail.postfix.additional_mailbox_domains
       ++ lib.remove "localhost.immae.eu" (lib.remove null (lib.flatten (map
          (zone: map
            (e: if e.receive
            then "${e.domain}${lib.optionalString (e.domain != "") "."}${zone.name}"
            else null
            )
            (zone.withEmail or [])
          )
          myconfig.env.dns.masterZones
        )));
      virtual_mailbox_maps = "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 []) myconfig.env.mail.postfix.backup_domains);
      relay_recipient_maps = lib.flatten (lib.attrsets.mapAttrsToList (n: v:
        lib.imap1 (i: m: "${m.type}:/etc/postfix/relay_${n}_${toString i}") v.recipient_maps
      ) myconfig.env.mail.postfix.backup_domains);
      smtpd_relay_restrictions = [
        "permit_mynetworks"
        "permit_sasl_authenticated"
        "defer_unauth_destination"
      ] ++ lib.flatten (lib.attrsets.mapAttrsToList (n: v:
        if lib.attrsets.hasAttr "relay_restrictions" v
        then [ "check_recipient_access hash:/etc/postfix/recipient_access_${n}" ]
        else []
      ) myconfig.env.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  = myconfig.env.servers.eldiron.ips.main.ip4;
      smtp_bind_address6 = builtins.head myconfig.env.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 = "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.
          dovecot_exe = "${pkgs.dovecot}/libexec/dovecot/dovecot-lda -f \${sender} -a \${original_recipient} -d \${user}@\${nexthop}";
        in [
          "flags=DRhu" "user=vhost:vhost"
          "argv=${pkgs.rspamd}/bin/rspamc -h ${config.myServices.mail.rspamd.sockets.worker-controller} -c bayes -d \${user}@\${nexthop} --mime --exec {${dovecot_exe}}"
        ];
      };
    };
  };
  config.security.acme.certs."mail" = {
    postRun = ''
      systemctl restart postfix.service
      '';
    extraDomains = {
      "smtp.immae.eu" = null;
    };
  };
}
Commit	Line	Data
a929614f IB	1	{ lib, pkgs, config, myconfig, ... }:
	2	{
	3	config.secrets.keys = [
	4	{
	5	dest = "postfix/mysql_alias_maps";
	6	user = config.services.postfix.user;
	7	group = config.services.postfix.group;
	8	permissions = "0440";
	9	text = ''
	10	# We need to specify that option to trigger ssl connection
	11	tls_ciphers = TLSv1.2
	12	user = ${myconfig.env.mail.postfix.mysql.user}
	13	password = ${myconfig.env.mail.postfix.mysql.password}
	14	hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
	15	dbname = ${myconfig.env.mail.postfix.mysql.database}
	16	query = SELECT DISTINCT destination
	17	FROM forwardings_merge
	18	WHERE
	19	((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
	20	AND active = 1
	21	AND '%s' NOT IN
	22	(
	23	SELECT source
	24	FROM forwardings_blacklisted
	25	WHERE source = '%s'
	26	) UNION
	27	SELECT 'devnull@immae.eu'
	28	FROM forwardings_blacklisted
	29	WHERE source = '%s'
	30	'';
	31	}
	32	{
	33	dest = "postfix/mysql_mailbox_maps";
	34	user = config.services.postfix.user;
	35	group = config.services.postfix.group;
	36	permissions = "0440";
	37	text = ''
	38	# We need to specify that option to trigger ssl connection
	39	tls_ciphers = TLSv1.2
	40	user = ${myconfig.env.mail.postfix.mysql.user}
	41	password = ${myconfig.env.mail.postfix.mysql.password}
	42	hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
	43	dbname = ${myconfig.env.mail.postfix.mysql.database}
	44	result_format = /%d/%u
	45	query = SELECT DISTINCT '%s'
	46	FROM mailboxes
	47	WHERE active = 1
	48	AND (
	49	(domain = '%d' AND user = '%u' AND regex = 0)
	50	OR (
	51	regex = 1
	52	AND '%d' REGEXP CONCAT('^',domain,'$')
	53	AND '%u' REGEXP CONCAT('^',user,'$')
	54	)
	55	)
	56	LIMIT 1
	57	'';
	58	}
	59	{
	60	dest = "postfix/mysql_sender_login_maps";
	61	user = config.services.postfix.user;
	62	group = config.services.postfix.group;
	63	permissions = "0440";
	64	text = ''
65	# We need to specify that option to trigger ssl connection
66	tls_ciphers = TLSv1.2
67	user = ${myconfig.env.mail.postfix.mysql.user}
68	password = ${myconfig.env.mail.postfix.mysql.password}
69	hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
70	dbname = ${myconfig.env.mail.postfix.mysql.database}
71	query = SELECT DISTINCT destination
72	FROM forwardings_merge
73	WHERE
74	((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
75	AND active = 1
76	'';
77	}
78	];
79
ca4630ca	80	config.networking.firewall.allowedTCPPorts = [ 25 465 587 ];
a929614f IB	81
	82	config.nixpkgs.overlays = [ (self: super: {
	83	postfix = super.postfix.override { withMySQL = true; };
	84	}) ];
	85	config.users.users."${config.services.postfix.user}".extraGroups = [ "keys" ];
	86	config.services.filesWatcher.postfix = {
	87	restart = true;
	88	paths = [
	89	config.secrets.fullPaths."postfix/mysql_alias_maps"
	90	config.secrets.fullPaths."postfix/mysql_mailbox_maps"
	91	config.secrets.fullPaths."postfix/mysql_sender_login_maps"
	92	];
	93	};
	94	config.services.postfix = {
	95	mapFiles = let
04b2ab97 IB	96	recipient_maps = let
	97	name = n: i: "relay_${n}_${toString i}";
	98	pair = n: i: m: lib.attrsets.nameValuePair (name n i) (
	99	if m.type == "hash"
	100	then pkgs.writeText (name n i) m.content
	101	else null
	102	);
	103	pairs = n: v: lib.imap1 (i: m: pair n i m) v.recipient_maps;
	104	in lib.attrsets.filterAttrs (k: v: v != null) (
a929614f IB	105	lib.attrsets.listToAttrs (lib.flatten (
	106	lib.attrsets.mapAttrsToList pairs myconfig.env.mail.postfix.backup_domains
	107	))
	108	);
04b2ab97 IB	109	relay_restrictions = lib.attrsets.filterAttrs (k: v: v != null) (
	110	lib.attrsets.mapAttrs' (n: v:
	111	lib.attrsets.nameValuePair "recipient_access_${n}" (
	112	if lib.attrsets.hasAttr "relay_restrictions" v
	113	then pkgs.writeText "recipient_access_${n}" v.relay_restrictions
	114	else null
	115	)
	116	) myconfig.env.mail.postfix.backup_domains
	117	);
	118	in
	119	recipient_maps // relay_restrictions;
a929614f IB	120	config = {
	121	### postfix module overrides
	122	readme_directory = "${pkgs.postfix}/share/postfix/doc";
	123	smtp_tls_CAfile = lib.mkForce "";
	124	smtp_tls_cert_file = lib.mkForce "";
	125	smtp_tls_key_file = lib.mkForce "";
	126
	127	message_size_limit = "1073741824"; # Don't put 0 here, it's not equivalent to "unlimited"
	128	alias_database = "\$alias_maps";
	129
	130	### Virtual mailboxes config
	131	virtual_alias_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_alias_maps"}";
	132	virtual_mailbox_domains = myconfig.env.mail.postfix.additional_mailbox_domains
	133	++ lib.remove "localhost.immae.eu" (lib.remove null (lib.flatten (map
	134	(zone: map
	135	(e: if e.receive
	136	then "${e.domain}${lib.optionalString (e.domain != "") "."}${zone.name}"
	137	else null
	138	)
	139	(zone.withEmail or [])
	140	)
	141	myconfig.env.dns.masterZones
	142	)));
	143	virtual_mailbox_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_mailbox_maps"}";
	144	dovecot_destination_recipient_limit = "1";
	145	virtual_transport = "dovecot";
	146
	147	### Relay domains
	148	relay_domains = lib.flatten (lib.attrsets.mapAttrsToList (n: v: v.domains or []) myconfig.env.mail.postfix.backup_domains);
	149	relay_recipient_maps = lib.flatten (lib.attrsets.mapAttrsToList (n: v:
	150	lib.imap1 (i: m: "${m.type}:/etc/postfix/relay_${n}_${toString i}") v.recipient_maps
	151	) myconfig.env.mail.postfix.backup_domains);
04b2ab97 IB	152	smtpd_relay_restrictions = [
	153	"permit_mynetworks"
	154	"permit_sasl_authenticated"
	155	"defer_unauth_destination"
	156	] ++ lib.flatten (lib.attrsets.mapAttrsToList (n: v:
	157	if lib.attrsets.hasAttr "relay_restrictions" v
	158	then [ "check_recipient_access hash:/etc/postfix/recipient_access_${n}" ]
	159	else []
	160	) myconfig.env.mail.postfix.backup_domains);
a929614f IB	161
	162	### Additional smtpd configuration
	163	smtpd_tls_received_header = "yes";
	164	smtpd_tls_loglevel = "1";
	165
	166	### Email sending configuration
	167	smtp_tls_security_level = "may";
	168	smtp_tls_loglevel = "1";
	169
	170	### Force ip bind for smtp
	171	smtp_bind_address = myconfig.env.servers.eldiron.ips.main.ip4;
	172	smtp_bind_address6 = builtins.head myconfig.env.servers.eldiron.ips.main.ip6;
	173
	174	# #Unneeded if postfix can only send e-mail from "self" domains
	175	# #smtp_sasl_auth_enable = "yes";
	176	# #smtp_sasl_password_maps = "hash:/etc/postfix/relay_creds";
	177	# #smtp_sasl_security_options = "noanonymous";
	178	# #smtp_sender_dependent_authentication = "yes";
	179	# #sender_dependent_relayhost_maps = "hash:/etc/postfix/sender_relay";
	180
	181	### opendkim, opendmarc, openarc milters
	182	non_smtpd_milters = [
	183	"unix:${config.myServices.mail.milters.sockets.opendkim}"
	184	"unix:${config.myServices.mail.milters.sockets.opendmarc}"
	185	"unix:${config.myServices.mail.milters.sockets.openarc}"
	186	];
	187	smtpd_milters = [
	188	"unix:${config.myServices.mail.milters.sockets.opendkim}"
	189	"unix:${config.myServices.mail.milters.sockets.opendmarc}"
	190	"unix:${config.myServices.mail.milters.sockets.openarc}"
	191	];
	192	};
	193	enable = true;
	194	enableSmtp = true;
	195	enableSubmission = true;
	196	submissionOptions = {
	197	smtpd_tls_security_level = "encrypt";
	198	smtpd_sasl_auth_enable = "yes";
	199	smtpd_tls_auth_only = "yes";
	200	smtpd_sasl_tls_security_options = "noanonymous";
	201	smtpd_sasl_type = "dovecot";
	202	smtpd_sasl_path = "private/auth";
	203	smtpd_reject_unlisted_recipient = "no";
	204	smtpd_client_restrictions = "permit_sasl_authenticated,reject";
	205	# Refuse to send e-mails with a From that is not handled
	206	smtpd_sender_restrictions =
	207	"reject_sender_login_mismatch,reject_unlisted_sender,permit_sasl_authenticated,reject";
	208	smtpd_sender_login_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_sender_login_maps"}";
	209	smtpd_recipient_restrictions = "permit_sasl_authenticated,reject";
	210	milter_macro_daemon_name = "ORIGINATING";
	211	smtpd_milters = "unix:${config.myServices.mail.milters.sockets.opendkim}";
	212	};
afcc5de0 IB	213	# FIXME: Mail adressed to localhost.immae.eu will still have mx-1 as
	214	# prioritized MX, which provokes "mail for localhost.immae.eu loops
	215	# back to myself" errors. This transport entry forces to push
	216	# e-mails to its right destination.
	217	transport = ''
	218	localhost.immae.eu smtp:[immae.eu]:25
	219	'';
a929614f IB	220	destination = ["localhost"];
	221	# This needs to reverse DNS
	222	hostname = "eldiron.immae.eu";
	223	setSendmail = true;
	224	sslCert = "/var/lib/acme/mail/fullchain.pem";
	225	sslKey = "/var/lib/acme/mail/key.pem";
	226	recipientDelimiter = "+";
	227	masterConfig = {
ca4630ca IB	228	submissions = {
	229	type = "inet";
	230	private = false;
	231	command = "smtpd";
	232	args = ["-o" "smtpd_tls_wrappermode=yes" ] ++ (let
	233	mkKeyVal = opt: val: [ "-o" (opt + "=" + val) ];
	234	in lib.concatLists (lib.mapAttrsToList mkKeyVal config.services.postfix.submissionOptions)
	235	);
	236	};
a929614f IB	237	dovecot = {
	238	type = "unix";
	239	privileged = true;
	240	chroot = false;
	241	command = "pipe";
	242	args = let
	243	# rspamd could be used as a milter, but then it cannot apply
	244	# its checks "per user" (milter is not yet dispatched to
	245	# users), so we wrap dovecot-lda inside rspamc per recipient
	246	# here.
	247	dovecot_exe = "${pkgs.dovecot}/libexec/dovecot/dovecot-lda -f \${sender} -a \${original_recipient} -d \${user}@\${nexthop}";
	248	in [
	249	"flags=DRhu" "user=vhost:vhost"
	250	"argv=${pkgs.rspamd}/bin/rspamc -h ${config.myServices.mail.rspamd.sockets.worker-controller} -c bayes -d \${user}@\${nexthop} --mime --exec {${dovecot_exe}}"
	251	];
	252	};
	253	};
	254	};
	255	config.security.acme.certs."mail" = {
	256	postRun = ''
	257	systemctl restart postfix.service
	258	'';
	259	extraDomains = {
	260	"smtp.immae.eu" = null;
	261	};
	262	};
	263	}