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|
{ config, lib, pkgs, ... }:
with lib; let
cfg = config.local.mta;
inherit (config.local) domains virtual users;
inherit (config.networking) domain;
in
{
options.local.mta = {
enable = mkEnableOption "mail transfer agent";
mdaAddr = mkOption {
type = types.str;
};
saslPort = mkOption {
type = types.port;
};
lmtpPort = mkOption {
type = types.port;
};
};
config = mkIf cfg.enable {
services = {
fail2ban.jails.postfix.settings = {
filter = "postfix[mode=aggressive]";
};
opendkim = {
enable = true;
group = "postfix";
domains = "csl:${domain}";
selector = "202402";
configFile = pkgs.writeText "opendkim.conf" ''
UMask 007
'';
};
postfix =
let
cert = config.security.acme.certs.${domains.smtp.main}.directory;
virtualDomains = filterAttrs (name: _: name != domain) virtual;
in
{
enable = true;
enableSmtp = true;
enableSubmission = true;
enableSubmissions = true;
inherit domain;
hostname = domains.smtp.main;
#TODO: check_recipient_access para rechazar localhost desde afuera
destination = [ "localhost" "$mydomain" ];
origin = "$mydomain";
networksStyle = "host";
sslKey = "${cert}/key.pem";
sslCert = "${cert}/fullchain.pem";
# También es postmaster
rootAlias = config.local.sysadmin;
extraAliases = concatStrings
(flatten (mapAttrsToList
(name: user: map
(alias: ''
${alias}: ${name}
'')
user.hardAliases)
users));
localRecipients = map
(user: "${user}@${domain}")
(attrNames (users // virtual.${domain}.users));
virtual = concatStrings (flatten (mapAttrsToList
(name: virtual: mapAttrsToList
(alias: targets: ''
${alias}@${name} ${concatStringsSep ", " targets}
'')
virtual.aliases)
virtual));
mapFiles = {
sender_login =
pkgs.writeText "postfix-sender_login"
(concatStrings (flatten (mapAttrsToList
(username: user: map
(alias: ''
${alias}@${domain} ${username}
'')
([ username ] ++ user.hardAliases))
users)));
virtual_recipients =
pkgs.writeText "postfix-virtual-recipients"
(concatStrings (flatten (mapAttrsToList
(virtualDomain: virtual: mapAttrsToList
# El lado derecho de esta tabla debe existir pero nunca se usa
(username: _: ''
${username}@${virtualDomain} foo
'')
virtual.users)
virtualDomains)));
virtual_rules =
pkgs.writeText "postfix-virtual-rules"
(concatStrings (flatten (mapAttrsToList
(name: virtual: map
(rule: ''
/^${rule.pattern}@${name}$/ ${concatStringsSep ", " rule.targets}
'')
virtual.rules)
virtual)));
};
config =
let
mdaTransport = "lmtp:inet:${cfg.mdaAddr}:${toString cfg.lmtpPort}";
in
{
message_size_limit = toString (50 * 1048576);
virtual_alias_maps = mkAfter [ "pcre:/etc/postfix/virtual_rules" ];
virtual_mailbox_domains = attrNames virtualDomains;
virtual_mailbox_maps = [ "hash:/etc/postfix/virtual_recipients" ];
local_transport = mdaTransport;
virtual_transport = mdaTransport;
smtpd_sasl_auth_enable = true;
smtpd_sasl_type = "dovecot";
smtpd_sasl_path = "inet:${cfg.mdaAddr}:${toString cfg.saslPort}";
smtpd_sasl_tls_security_options = [ "noanonymous" ];
smtpd_tls_auth_only = true;
smtpd_tls_dh1024_param_file = config.security.dhparams.params.postfix.path;
smtpd_relay_restrictions = [
"permit_mynetworks"
"permit_sasl_authenticated"
"reject_unauth_destination"
];
smtpd_sender_login_maps = [ "hash:/etc/postfix/sender_login" ];
smtpd_sender_restrictions = [
"permit_mynetworks"
"reject_sender_login_mismatch"
"permit_sasl_authenticated"
];
smtpd_milters = "unix:/run/opendkim/opendkim.sock";
non_smtpd_milters = "$smtpd_milters";
milter_default_action = "accept";
};
};
};
security.dhparams.params.postfix = { };
networking.firewall.allowedTCPPorts = [ 25 465 ];
local = {
boot.impermanence.directories = [
{ directory = "/var/lib/opendkim"; user = "opendkim"; group = "postfix"; mode = "u=rwx,g=,o="; }
{ directory = "/var/lib/postfix"; user = "root"; group = "root"; mode = "u=rwx,g=rx,o=rx"; }
];
certs.smtp.enable = true;
};
};
}
|
