+{ 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 = [ 25 587 ];
+
+ config.nixpkgs.overlays = [ (self: super: {
+ postfix = super.postfix.override { withMySQL = true; };
+ }) ];
+ config.users.users."${config.services.postfix.user}".extraGroups = [ "keys" ];
+ config.services.filesWatcher.postfix = {
+ restart = true;
+ paths = [
+ config.secrets.fullPaths."postfix/mysql_alias_maps"
+ config.secrets.fullPaths."postfix/mysql_mailbox_maps"
+ config.secrets.fullPaths."postfix/mysql_sender_login_maps"
+ ];
+ };
+ config.services.postfix = {
+ mapFiles = let
+ name = n: i: "relay_${n}_${toString i}";
+ pair = n: i: m: lib.attrsets.nameValuePair (name n i) (
+ if m.type == "hash"
+ then pkgs.writeText (name n i) m.content
+ else null
+ );
+ pairs = n: v: lib.imap1 (i: m: pair n i m) v.recipient_maps;
+ in
+ lib.attrsets.filterAttrs (k: v: v != null) (
+ lib.attrsets.listToAttrs (lib.flatten (
+ lib.attrsets.mapAttrsToList pairs myconfig.env.mail.postfix.backup_domains
+ ))
+ );
+ config = {
+ ### postfix module overrides
+ readme_directory = "${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);
+
+ ### 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}";
+ };
+ 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 = {
+ 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;
+ };
+ };
+}