{ pkgs, lib, config, ... }:
let
inherit (lib) types;
inherit (config) networking users;
inherit (config.services) postfix;
in
{
imports = [
#postfix/autogeree.net.nix
#postfix/sourcephile.fr.nix
];
users.groups.acme.members = [ postfix.user ];
networking.nftables.ruleset = ''
#add rule inet filter net2fw tcp dport 25 counter accept comment "SMTP"
#add rule inet filter net2fw tcp dport 465 counter accept comment "submissions"
add rule inet filter fw2net meta skuid ${postfix.user} tcp dport 25 counter accept comment "SMTP"
'';
services.postfix = {
enable = true;
networksStyle = "host";
hostname ="${networking.hostName}.${networking.domain}";
domain = networking.domain;
origin = "$myhostname";
destination = [
"localhost"
"localhost.localdomain"
"$myhostname"
];
postmasterAlias = "root";
rootAlias = "root@${networking.domain}";
sslKey = "/var/lib/acme/${networking.domain}/key.pem";
sslCert = "/var/lib/acme/${networking.domain}/fullchain.pem";
networks = [
"127.0.0.0/8"
"[::1]/128"
];
setSendmail = true;
# Parse the extension in email address, eg. contact+extension@
recipientDelimiter = "+";
config = {
debug_peer_level = "4";
debug_peer_list = [
#"chomsky.autogeree.net"
#"localhost"
#"mail.sourcephile.fr"
];
#
# Sending to the world
#
# Appending .domain is the MUA's job
append_dot_mydomain = false;
smtp_body_checks = "";
#smtp_cname_overrides_servername = false;
smtp_connect_timeout = "60s";
#smtp_header_checks = "regexp:/var/lib/postfix/smtp_header_checks";
smtp_mime_header_checks = "";
smtp_nested_header_checks = "";
smtp_tls_exclude_ciphers = [ "ADH" "MD5" "CAMELLIA" "SEED" "3DES" "DES" "RC4" "eNULL" "aNULL" ];
#smtp_tls_fingerprint_digest = "sha1";
smtp_tls_loglevel = "1";
#smtp_tls_note_starttls_offer = true;
#smtp_tls_policy_maps = "hash:/var/lib/postfix/conf/tls_policy";
# Only allow TLSv* protocols
smtp_tls_protocols = [ "!SSLv2" "!SSLv3" ];
#smtp_tls_scert_verifydepth = "5";
#smtp_tls_secure_cert_match = [ "nexthop" "dot-nexthop" ];
smtp_tls_security_level = "may";
smtp_tls_session_cache_database = "btree:$data_directory/smtp_tls_session_cache";
#smtp_tls_session_cache_timeout = "3600s";
#smtp_tls_verify_cert_match = "hostname";
#
# Receiving from the world
#
message_size_limit = "20480000";
maximal_queue_lifetime = "5d";
default_extra_recipient_limit = "5000";
line_length_limit = "2048";
duplicate_filter_limit = "5000";
# Stops mail from poorly written software
strict_rfc821_envelopes = true;
mime_header_checks = [];
milter_header_checks = [];
nested_header_checks = [];
body_checks = [];
content_filter = "";
permit_mx_backup_networks = [];
propagate_unmatched_extensions = [ "canonical" "virtual" "alias" ];
#masquerade_classes = [ "envelope_sender" "header_sender" "header_recipient" ];
#masquerade_domains = "";
#masquerade_exceptions = "root";
queue_minfree = "0";
# Stops some techniques used to harvest email addresses
disable_vrfy_command = true;
enable_long_queue_ids = false;
# Useful to test restrictions
smtpd_authorized_xclient_hosts = "127.0.0.1";
smtpd_banner = "$myhostname ESMTP $mail_name (NixOS)";
smtpd_client_connection_count_limit = "50";
smtpd_client_connection_rate_limit = "0";
smtpd_client_event_limit_exceptions = "$mynetworks";
smtpd_client_message_rate_limit = "0";
smtpd_client_new_tls_session_rate_limit = "0";
smtpd_client_port_logging = false;
smtpd_client_recipient_rate_limit = "0";
# Ban 5 sec on error
smtpd_error_sleep_time = "5";
# Needed to enforce reject_unknown_helo_hostname
smtpd_helo_required = true;
smtpd_helo_restrictions = [
"reject_invalid_helo_hostname"
"reject_non_fqdn_helo_hostname"
# Don't talk to mail systems that don't know their own hostname.
"reject_unknown_helo_hostname"
"permit"
];
smtpd_client_restrictions = [
];
# Set in postfix/*.nix and used in submissions/smptd
# with reject_sender_login_mismatch
smtpd_sender_login_maps = [];
smtpd_sender_restrictions = [
"reject_non_fqdn_sender"
"permit"
];
smtpd_reject_unlisted_recipient = true;
# Check the RCPT TO, before smtpd_recipient_restrictions
# Restrictions based on what is allowed or not,
# these are applied before smtpd_recipient_restrictions
smtpd_relay_restrictions = [
"permit_mynetworks"
# Check the recipient's address in virtual_mailbox_domains and virtual_mailbox_maps
"permit_auth_destination"
# The world is only authorized to use our relay for the above destinations.
"reject"
];
# Restrictions based on what is working or not
smtpd_recipient_restrictions = [
# Reject if the domain is not fully qualified
"reject_non_fqdn_recipient"
# Reject if the domain is not working, even before bothering to check the address
"reject_unknown_recipient_domain"
# Reject if the address is not working
# WARNING: this does not work if the recipient is greylisting.
# WARNING: verify(8) has a cache, dumpable if verify(8) is stopped, with:
# postmap -s btree:/var/lib/postfix/data/verify_cache
#"reject_unverified_recipient"
"permit"
];
# Trust the verify database
#unverified_recipient_reject_code = "550";
smtpd_data_restrictions = [
# Force the smtpd's client to wait OK before sending
"reject_unauth_pipelining"
"permit"
];
smtpd_end_of_data_restrictions = [
# Enforce mail volume quota via policy service callouts.
#check_policy_service unix:private/policy
];
#smtpd_milters = "";
smtpd_peername_lookup = true;
smtpd_recipient_limit = "5000";
smtpd_recipient_overshoot_limit = "5000";
#smtpd_restriction_classes = "";
#smtpd_sasl_auth_enable = true;
#smtpd_sasl_path = "private/auth";
#smtpd_sasl_security_options = "noanonymous";
#smtpd_sasl_type = "dovecot";
smtpd_starttls_timeout = "300s";
#smtpd_tls_always_issue_session_ids = true;
#smtpd_tls_CApath = "/etc/postfix/x509/ca/";
smtpd_tls_ask_ccert = false;
#smtpd_tls_ccert_verifydepth = "5";
smtpd_tls_ciphers = "high";
smtpd_tls_eecdh_grade = "auto";
# Disable weak ciphers as reported by https://ssl-tools.net
# https://serverfault.com/questions/744168/how-to-disable-rc4-on-postfix
smtpd_tls_exclude_ciphers = [ "ADH" "MD5" "CAMELLIA" "SEED" "3DES" "DES" "RC4" "eNULL" "aNULL" ];
smtpd_tls_fingerprint_digest = "sha512";
# Log only a summary message on TLS handshake completion
smtpd_tls_loglevel = "1";
smtpd_tls_mandatory_ciphers = "high";
smtpd_tls_mandatory_protocols = [ "!SSLv2" "!SSLv3" ];
# Only allow TLSv*
smtpd_tls_protocols = [ "!SSLv2" "!SSLv3" ];
#smtpd_tls_received_header = false;
smtpd_tls_req_ccert = false;
# Postfix 2.3 and later
# encrypt
# Mandatory TLS encryption: announce STARTTLS support to SMTP clients, and require that clients use TLS
# encryption. According to [1720]RFC 2487 this MUST NOT be applied in case of a publicly-referenced
# SMTP server. Instead, this option should be used only on dedicated servers.
smtpd_tls_security_level = "may";
smtpd_tls_session_cache_database = "btree:$data_directory/smtpd_tls_session_cache";
#smtpd_tls_session_cache_timeout = "3600s";
#smtpd_tls_chain_files =
relayhost = [];
#relay_clientcerts = hash:/var/lib/postfix/conf/relay_clientcerts
# This is where to put backup MX domains
relay_domains = [];
relay_recipient_maps = [];
# Use a non blocking source of randomness
tls_random_source = "dev:/dev/urandom";
# Map each domain to a specific X.509 certificate
tls_server_sni_maps = "hash:/run/keys/postfix-sni";
# Only explicitely aliased accounts have a mail, not all the passwd
#local_recipient_maps = "$alias_maps";
# Note that the local transport rewrites the envelope recipient
# according to the alias_maps, and thus the aliasing is transparent
# to the nexthop (eg. dovecot)
local_transport = "local:$myhostname";
# No console bell on new mail
biff = false;
forward_path = [
/*
"$home/.forward''${recipient_delimiter}''${extension}"
*/
"$home/.forward"
];
# Filled by the postfix/*.nix
virtual_mailbox_domains = [];
# Completed by the postfix/*.nix
virtual_mailbox_maps = [
#"hash:/etc/postfix/virtual"
];
#virtual_transport = "lmtp:unix:private/dovecot-lmtp";
/*
dovecot_destination_recipient_limit = "1";
virtual_transport = "dovecot";
*/
# There is no fallback
fallback_transport = "";
};
transport = ''
sourcephile.wg local:losurdo
'';
virtualMapType = "hash";
masterConfig =
let
mkVal = value:
if lib.isList value
then lib.concatStringsSep "," value
else
if value == true then "yes"
else if value == false then "no"
else toString value;
mkKeyVal = opt: val: [ "-o" (opt + "=" + mkVal val) ];
mkArgs = args: lib.concatLists (lib.mapAttrsToList mkKeyVal args);
in {
pickup = {
args = mkArgs {
cleanup_service_name = "submissions-header-cleanup";
};
};
/*
# Implicit TLS on port 465
# https://tools.ietf.org/html/rfc8314#section-3.3
submissions = {
type = "inet";
private = false;
command = "smtpd";
args = mkArgs {
syslog_name = "postfix/submissions";
# Implicit TLS, not STARTTLS
smtpd_tls_wrappermode = true;
smtpd_tls_mandatory_protocols = [
"TLSv1.3"
# FIXME: to be removed when K-9 Mail will support TLSv1.3,
# K-9 Mail 5.600 does not.
"TLSv1.2"
];
milter_macro_daemon_name = "ORIGINATING";
smtpd_helo_restrictions = [
"permit_sasl_authenticated"
] ++ postfix.config.smtpd_helo_restrictions;
smtpd_relay_restrictions = [
# SASL authorizes to send to the world
"permit_sasl_authenticated"
"reject"
];
smtpd_sasl_auth_enable = true;
smtpd_sasl_type = "dovecot";
smtpd_sasl_path = "private/auth";
smtpd_sasl_local_domain = "";
# Offer SASL authentication only after a TLS-encrypted session has been established
smtpd_tls_auth_only = true;
smtpd_sasl_tls_security_options = [ "noanonymous" ];
# Do not put SASL logins in mail headers
smtpd_sasl_authenticated_header = false;
# Who cares about (old) Outlook
broken_sasl_auth_clients = false;
smtpd_sender_restrictions = [
"reject_non_fqdn_sender"
# Check that the SASL user is using only its own
# mail addresses on the envelope, as indicated in smtpd_sender_login_maps
"reject_sender_login_mismatch"
"permit"
];
# No X.509 certificates for users, for now
smtpd_tls_ask_ccert = false;
smtpd_tls_ccert_verifydepth = 0;
smtpd_tls_loglevel = 1;
smtpd_tls_req_ccert = false;
cleanup_service_name = "submissions-header-cleanup";
};
};
*/
};
extraMasterConf = ''
'';
};
}