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|
{ config, pkgs, lib, ... }:
with lib;
let
compileSieve = name: text: pkgs.runCommand name {} ''
mkdir $out
cp ${pkgs.writeText name ''
''} $out/${name}
${pkgs.dovecot_pigeonhole}/bin/sievec $out/${name}
'';
in {
config = {
nixpkgs.overlays = [
(final: prev: {
postfix = prev.postfix.override {
withLDAP = false;
withPgSQL = true;
};
dovecot = prev.dovecot.override {
withSQLite = false;
withPgSQL = true;
};
})
];
services.postfix = {
enable = true;
hostname = "surtr.yggdrasil.li";
recipientDelimiter = "+";
setSendmail = true;
postmasterAlias = ""; rootAlias = ""; extraAliases = "";
destination = [];
sslCert = "/run/credentials/postfix.service/surtr.yggdrasil.li.pem";
sslKey = "/run/credentials/postfix.service/surtr.yggdrasil.li.key.pem";
networks = ["127.0.0.0/8" "[::ffff:127.0.0.0]/104" "[::1]/128" "10.141.0.0/16"];
config = let
relay_ccert = "texthash:${pkgs.writeText "relay_ccert" ""}";
in {
#the dh params
smtpd_tls_dh1024_param_file = toString config.security.dhparams.params."postfix-1024".path;
smtpd_tls_dh512_param_file = toString config.security.dhparams.params."postfix-512".path;
#enable ECDH
smtpd_tls_eecdh_grade = "strong";
#enabled SSL protocols, don't allow SSLv2 and SSLv3
smtpd_tls_protocols = ["!SSLv2" "!SSLv3" "!TLSv1" "!TLSv1.1" "!TLSv1.2"];
smtpd_tls_mandatory_protocols = ["!SSLv2" "!SSLv3" "!TLSv1" "!TLSv1.1" "!TLSv1.2"];
#allowed ciphers for smtpd_tls_security_level=encrypt
smtpd_tls_mandatory_ciphers = "high";
#allowed ciphers for smtpd_tls_security_level=may
#smtpd_tls_ciphers = high
#enforce the server cipher preference
tls_preempt_cipherlist = true;
#disable following ciphers for smtpd_tls_security_level=encrypt
smtpd_tls_mandatory_exclude_ciphers = ["aNULL" "MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL"];
#disable following ciphers for smtpd_tls_security_level=may
smtpd_tls_exclude_ciphers = ["aNULL" "MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL"];
#enable TLS logging to see the ciphers for inbound connections
smtpd_tls_loglevel = "1";
#enable TLS logging to see the ciphers for outbound connections
smtp_tls_loglevel = "1";
smtpd_tls_received_header = true;
smtpd_tls_ask_ccert = true;
smtpd_tls_CAfile = toString ./ca/ca.crt;
smtp_tls_security_level = "dane";
smtp_dns_support_level = "dnssec";
tls_server_sni_maps = ''texthash:${pkgs.writeText "sni" ''
bouncy.email /run/credentials/postfix.service/bouncy.email.full.pem
mailin.bouncy.email /run/credentials/postfix.service/mailin.bouncy.email.full.pem
mailsub.bouncy.email /run/credentials/postfix.service/mailsub.bouncy.email.full.pem
.bouncy.email /run/credentials/postfix.service/bouncy.email.full.pem
''}'';
local_recipient_maps = "";
# 10 GiB
message_size_limit = "10737418240";
# 10 GiB
mailbox_size_limit = "10737418240";
smtpd_delay_reject = true;
smtpd_helo_required = true;
smtpd_helo_restrictions = "permit";
smtpd_recipient_restrictions = [
"reject_unauth_pipelining"
"reject_non_fqdn_recipient"
"reject_unknown_recipient_domain"
"permit_mynetworks"
"check_ccert_access ${relay_ccert}"
"reject_non_fqdn_helo_hostname"
"reject_invalid_helo_hostname"
"reject_unauth_destination"
"reject_unknown_recipient_domain"
"reject_unverified_recipient"
];
smtpd_relay_restrictions = [
"permit_mynetworks"
"check_ccert_access ${relay_ccert}"
"reject_unauth_destination"
];
propagate_unmatched_extensions = ["canonical" "virtual" "alias"];
smtpd_authorized_verp_clients = "$authorized_verp_clients";
authorized_verp_clients = "$mynetworks";
milter_default_action = "accept";
smtpd_milters = [config.services.opendkim.socket "local:/run/rspamd/rspamd-milter.sock"];
non_smtpd_milters = [config.services.opendkim.socket "local:/run/rspamd/rspamd-milter.sock"];
alias_maps = "";
queue_run_delay = "10s";
minimal_backoff_time = "1m";
maximal_backoff_time = "10m";
maximal_queue_lifetime = "100m";
bounce_queue_lifetime = "20m";
smtpd_discard_ehlo_keyword_address_maps = "cidr:${pkgs.writeText "esmtp_access" ''
# Allow DSN requests from local subnet only
192.168.0.0/16 silent-discard
172.16.0.0/12 silent-discard
10.0.0.0/8 silent-discard
0.0.0.0/0 silent-discard, dsn
fd00::/8 silent-discard
::/0 silent-discard, dsn
''}";
sender_canonical_maps = "tcp:localhost:${toString config.services.postsrsd.forwardPort}";
sender_canonical_classes = "envelope_sender";
recipient_canonical_maps = "tcp:localhost:${toString config.services.postsrsd.reversePort}";
recipient_canonical_classes = ["envelope_recipient" "header_recipient"];
virtual_mailbox_domains = ''pgsql:${pkgs.writeText "virtual_mailbox_domains.cf" ''
dbname = emails
table = virtual_mailbox_domain
select_field = domain
where_field = domain
''}'';
virtual_mailbox_maps = ''pgsql:${pkgs.writeText "virtual_mailbox_maps.cf" ''
dbname = emails
table = virtual_mailbox_mapping
select_field = mailbox
where_field = lookup
''}'';
virtual_transport = "lmtp:unix:/run/postfix/dovecot-lmtp";
};
masterConfig = {
smtps = {
type = "inet";
private = false;
command = "smtpd";
args = [
"-o" "smtpd_tls_wrappermode=yes"
"-o" "smtpd_tls_ask_ccert=yes"
"-o" "smtpd_tls_req_ccert=yes"
"-o" "smtpd_client_restrictions=permit_tls_all_clientcerts,reject"
"-o" "smtpd_relay_restrictions=permit_tls_all_clientcerts,reject"
"-o" "smtpd_recipient_restrictions=reject_unauth_pipelining,reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_tls_all_clientcerts,reject"
"-o" "milter_macro_daemon_name=surtr.yggdrasil.li"
];
};
};
};
services.postsrsd = {
enable = true;
domain = "surtr.yggdrasil.li";
separator = "+";
excludeDomains = [ "surtr.yggdrasil.li"
".bouncy.email" "bouncy.email"
];
};
services.opendkim = {
enable = true;
user = "postfix"; group = "postfix";
socket = "local:/run/opendkim/opendkim.sock";
domains = ''csl:${concatStringsSep "," ["surtr.yggdrasil.li" "bouncy.email"]}'';
selector = "surtr";
configFile = builtins.toFile "opendkim.conf" ''
Syslog true
MTA surtr.yggdrasil.li
MTACommand ${config.security.wrapperDir}/sendmail
LogResults true
'';
};
services.rspamd = {
enable = true;
workers = {
controller = {};
external = {
type = "rspamd_proxy";
bindSockets = [
{ mode = "0660";
socket = "/run/rspamd/rspamd-milter.sock";
owner = config.services.rspamd.user;
group = config.services.rspamd.group;
}
];
extraConfig = ''
milter = yes;
upstream "local" {
default = yes;
self_scan = yes;
}
'';
};
};
locals = {
"milter_headers.conf".text = ''
use = ["authentication-results", "x-spamd-result", "x-rspamd-queue-id", "x-rspamd-server", "x-spam-level", "x-spam-status"];
extended_headers_rcpt = [];
'';
"actions.conf".text = ''
reject = 15;
add_header = 10;
greylist = 5;
'';
"groups.conf".text = ''
symbols {
"BAYES_SPAM" {
weight = 2.0;
}
}
'';
"dmarc.conf".text = ''
reporting = true;
send_reports = true;
report_settings {
org_name = "Yggdrasil.li";
domain = "yggdrasil.li";
email = "postmaster@yggdrasil.li";
}
'';
"redis.conf".text = ''
servers = "${config.services.redis.servers.rspamd.unixSocket}";
'';
"dkim_signing.conf".text = "enabled = false;";
"neural.conf".text = "enabled = false;";
"classifier-bayes.conf".text = ''
enable = true;
expire = 8640000;
new_schema = true;
backend = "redis";
per_user = true;
min_learns = 0;
autolearn = [0, 10];
statfile {
symbol = "BAYES_HAM";
spam = false;
}
statfile {
symbol = "BAYES_SPAM";
spam = true;
}
'';
# "redirectors.inc".text = ''
# visit.creeper.host
# '';
};
};
users.groups.${config.services.rspamd.group}.members = [ config.services.postfix.user ];
services.redis.servers.rspamd.enable = true;
users.groups.${config.services.redis.servers.rspamd.user}.members = [ config.services.rspamd.user ];
services.dovecot2 = {
enable = true;
sslServerCert = "/run/credentials/dovecot2.service/surtr.yggdrasil.li.pem";
sslServerKey = "/run/credentials/dovecot2.service/surtr.yggdrasil.li.key.pem";
sslCACert = toString ./ca/ca.crt;
mailLocation = "maildir:/var/lib/mail/%u/maildir:UTF-8";
modules = with pkgs; [ dovecot_pigeonhole ];
protocols = [ "lmtp" "sieve" ];
extraConfig = ''
mail_home = /var/lib/mail/%u
local_name imap.bouncy.email {
ssl_cert = </run/credentials/dovecot2.service/imap.bouncy.email.pem
ssl_key = </run/credentials/dovecot2.service/imap.bouncy.email.key.pem
}
local_name bouncy.email {
ssl_cert = </run/credentials/dovecot2.service/bouncy.email.pem
ssl_key = </run/credentials/dovecot2.service/bouncy.email.key.pem
}
ssl_require_crl = yes
ssl_verify_client_cert = yes
auth_ssl_username_from_cert = yes
auth_mechanisms = external
userdb {
driver = sql
args = ${pkgs.writeText "dovecot-sql.conf" ''
driver = pgsql
connect = host=localhost dbname=email
user_query = SELECT user, quota_rule FROM imap_user WHERE user = '%u'
''}
default_fields = uid=dovecot2 gid=dovecot2
}
mail_plugins = $mail_plugins quota
mailbox_list_index = yes
postmaster_address = postmaster@yggdrasil.li
recipient_delimiter = +
service lmtp {
vsz_limit = 1G
unix_listener /run/postfix/dovecot-lmtp {
mode = 0600
user = postfix
group = postfix
}
}
namespace inbox {
separator = /
inbox = yes
prefix =
}
plugin {
quota = maildir
quota_rule = *:storage=1GB
quota_rule2 = Trash:storage=+10%%
quota_status_overquota = "552 5.2.2 Mailbox is full"
quota_status_success = DUNNO
quota_status_nouser = DUNNO
quota_grace = 10%%
}
protocol imap {
mail_max_userip_connections = 50
mail_plugins = $mail_plugins imap_quota imap_sieve
}
service imap-login {
inet_listener imap {
port = 0
}
}
service managesieve-login {
inet_listener sieve {
port = 4190
ssl = yes
}
}
plugin {
sieve_plugins = sieve_imapsieve
sieve_redirect_envelope_from = orig_recipient
sieve_before = /etc/dovecot/sieve_before.d
}
'';
};
environment.etc."dovecot/sieve_before.d/tag-junk.sieve".text = ''
require ["imap4flags"];
if header :contains "X-Spam-Flag" "YES" {
addflag ["\\Junk"];
}
'';
security.dhparams = {
params = {
"postfix-512".bits = 512;
"postfix-1024".bits = 2048;
};
};
security.acme.domains = {
"bouncy.email" = {};
"mailin.bouncy.email" = {};
"mailsub.bouncy.email" = {};
"imap.bouncy.email" = {};
"surtr.yggdrasil.li" = {};
};
systemd.services.postfix = {
serviceConfig.LoadCredential = [
"surtr.yggdrasil.li.key.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/key.pem"
"surtr.yggdrasil.li.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/fullchain.pem"
"bouncy.email.full.pem:${config.security.acme.certs."bouncy.email".directory}/full.pem"
"mailin.bouncy.email.full.pem:${config.security.acme.certs."mailin.bouncy.email".directory}/full.pem"
"mailsub.bouncy.email.full.pem:${config.security.acme.certs."mailsub.bouncy.email".directory}/full.pem"
];
};
systemd.services.dovecot2 = {
preStart = ''
for f in /etc/dovecot/sieve_before.d/*.sieve; do
${pkgs.dovecot_pigeonhole}/bin/sievec $f
done
'';
serviceConfig = {
LoadCredential = [
"surtr.yggdrasil.li.key.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/key.pem"
"surtr.yggdrasil.li.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/fullchain.pem"
"bouncy.email.key.pem:${config.security.acme.certs."bouncy.email".directory}/key.pem"
"bouncy.email.pem:${config.security.acme.certs."bouncy.email".directory}/fullchain.pem"
"imap.bouncy.email.key.pem:${config.security.acme.certs."imap.bouncy.email".directory}/key.pem"
"imap.bouncy.email.pem:${config.security.acme.certs."imap.bouncy.email".directory}/fullchain.pem"
];
StateDirectory = "mail";
};
};
};
}
|
