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niten 2023-07-18 14:58:32 -07:00
parent 860bb22034
commit 8b3f771c23
1 changed files with 68 additions and 85 deletions
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123
lib/fudo/mail/postfix.nix
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@ -8,35 +8,28 @@ let
# The final newline is important # The final newline is important
write-entries = filename: entries: write-entries = filename: entries:
let let entries-string = (concatStringsSep "\n" entries);
entries-string = (concatStringsSep "\n" entries);
in builtins.toFile filename '' in builtins.toFile filename ''
${entries-string} ${entries-string}
''; '';
make-user-aliases = entries: make-user-aliases = entries:
concatStringsSep "\n" (mapAttrsToList (user: aliases:
concatStringsSep "\n" concatStringsSep "\n"
(mapAttrsToList (user: aliases: (map (alias: "${alias} ${user}@${cfg.domain}") aliases)) entries);
concatStringsSep "\n"
(map (alias: "${alias} ${user}") aliases))
entries);
make-alias-users = domains: entries: make-alias-users = domains: entries:
concatStringsSep "\n" concatStringsSep "\n" (flatten (mapAttrsToList (alias: users:
(flatten (map (domain: "${alias}@${domain} ${concatStringsSep "," users}")
(mapAttrsToList (alias: users: domains)) entries));
(map (domain:
"${alias}@${domain} ${concatStringsSep "," users}")
domains))
entries));
policyd-spf = pkgs.writeText "policyd-spf.conf" ( policyd-spf = pkgs.writeText "policyd-spf.conf"
cfg.postfix.policy-spf-extra-config (cfg.postfix.policy-spf-extra-config + (lib.optionalString cfg.debug ''
+ (lib.optionalString cfg.debug ''
debugLevel = 4 debugLevel = 4
'')); ''));
submission-header-cleanup-rules = pkgs.writeText "submission_header_cleanup_rules" ('' submission-header-cleanup-rules =
pkgs.writeText "submission_header_cleanup_rules" (''
# Removes sensitive headers from mails handed in via the submission port. # Removes sensitive headers from mails handed in via the submission port.
# See https://thomas-leister.de/mailserver-debian-stretch/ # See https://thomas-leister.de/mailserver-debian-stretch/
# Uses "pcre" style regex. # Uses "pcre" style regex.
@ -48,8 +41,7 @@ let
/^X-Enigmail:/ IGNORE /^X-Enigmail:/ IGNORE
''); '');
blacklist-postfix-entry = sender: "${sender} REJECT"; blacklist-postfix-entry = sender: "${sender} REJECT";
blacklist-postfix-file = filename: entries: blacklist-postfix-file = filename: entries: write-entries filename entries;
write-entries filename entries;
sender-blacklist-file = blacklist-postfix-file "reject_senders" sender-blacklist-file = blacklist-postfix-file "reject_senders"
(map blacklist-postfix-entry cfg.sender-blacklist); (map blacklist-postfix-entry cfg.sender-blacklist);
recipient-blacklist-file = blacklist-postfix-file "reject_recipients" recipient-blacklist-file = blacklist-postfix-file "reject_recipients"
@ -57,12 +49,13 @@ let
# A list of domains for which we accept mail # A list of domains for which we accept mail
virtual-mailbox-map-file = write-entries "virtual_mailbox_map" virtual-mailbox-map-file = write-entries "virtual_mailbox_map"
(map (domain: "@${domain} OK") (cfg.local-domains ++ [cfg.domain])); (map (domain: "@${domain} OK") (cfg.local-domains ++ [ cfg.domain ]));
sender-login-map-file = let sender-login-map-file =
escapeDot = (str: replaceStrings ["."] ["\\."] str); let escapeDot = (str: replaceStrings [ "." ] [ "\\." ] str);
in write-entries "sender_login_maps" in write-entries "sender_login_maps"
(map (domain: "/^(.*)@${escapeDot domain}$/ \${1}") (cfg.local-domains ++ [cfg.domain])); (map (domain: "/^(.*)@${escapeDot domain}$/ \${1}")
(cfg.local-domains ++ [ cfg.domain ]));
mapped-file = name: "hash:/var/lib/postfix/conf/${name}"; mapped-file = name: "hash:/var/lib/postfix/conf/${name}";
@ -112,7 +105,7 @@ in {
domain = cfg.domain; domain = cfg.domain;
origin = cfg.domain; origin = cfg.domain;
hostname = cfg.mail-hostname; hostname = cfg.mail-hostname;
destination = ["localhost" "localhost.localdomain"]; destination = [ "localhost" "localhost.localdomain" ];
# destination = ["localhost" "localhost.localdomain" cfg.hostname] ++ # destination = ["localhost" "localhost.localdomain" cfg.hostname] ++
# cfg.local-domains;; # cfg.local-domains;;
@ -132,25 +125,27 @@ in {
virtual = '' virtual = ''
${make-user-aliases cfg.user-aliases} ${make-user-aliases cfg.user-aliases}
${make-alias-users ([cfg.domain] ++ cfg.local-domains) cfg.alias-users} ${make-alias-users ([ cfg.domain ] ++ cfg.local-domains)
cfg.alias-users}
''; '';
sslCert = cfg.postfix.ssl-certificate; sslCert = cfg.postfix.ssl-certificate;
sslKey = cfg.postfix.ssl-private-key; sslKey = cfg.postfix.ssl-private-key;
config = { config = {
virtual_mailbox_domains = cfg.local-domains ++ [cfg.domain]; virtual_mailbox_domains = cfg.local-domains ++ [ cfg.domain ];
# virtual_mailbox_base = "${cfg.mail-directory}/"; # virtual_mailbox_base = "${cfg.mail-directory}/";
virtual_mailbox_maps = mapped-file "virtual_mailbox_map"; virtual_mailbox_maps = mapped-file "virtual_mailbox_map";
virtual_uid_maps = "static:${toString cfg.mail-user-id}"; virtual_uid_maps = "static:${toString cfg.mail-user-id}";
virtual_gid_maps = "static:${toString config.users.groups."${cfg.mail-group}".gid}"; virtual_gid_maps =
"static:${toString config.users.groups."${cfg.mail-group}".gid}";
virtual_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp"; virtual_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp";
# NOTE: it's important that this ends with /, to indicate Maildir format! # NOTE: it's important that this ends with /, to indicate Maildir format!
# mail_spool_directory = "${cfg.mail-directory}/"; # mail_spool_directory = "${cfg.mail-directory}/";
message_size_limit = toString(cfg.message-size-limit * 1024 * 1024); message_size_limit = toString (cfg.message-size-limit * 1024 * 1024);
smtpd_banner = "${cfg.mail-hostname} ESMTP NO UCE"; smtpd_banner = "${cfg.mail-hostname} ESMTP NO UCE";
@ -176,7 +171,8 @@ in {
recipient_delimiter = "+"; recipient_delimiter = "+";
milter_protocol = "6"; milter_protocol = "6";
milter_mail_macros = "i {mail_addr} {client_addr} {client_name} {auth_type} {auth_authen} {auth_author} {mail_addr} {mail_host} {mail_mailer}"; milter_mail_macros =
"i {mail_addr} {client_addr} {client_name} {auth_type} {auth_authen} {auth_author} {mail_addr} {mail_host} {mail_mailer}";
smtpd_milters = [ smtpd_milters = [
"unix:/run/rspamd/rspamd-milter.sock" "unix:/run/rspamd/rspamd-milter.sock"
@ -218,11 +214,8 @@ in {
"reject_non_fqdn_recipient" "reject_non_fqdn_recipient"
]; ];
smtpd_helo_restrictions = [ smtpd_helo_restrictions =
"permit_mynetworks" [ "permit_mynetworks" "reject_invalid_hostname" "permit" ];
"reject_invalid_hostname"
"permit"
];
# Handled by submission # Handled by submission
smtpd_tls_security_level = "may"; smtpd_tls_security_level = "may";
@ -230,44 +223,27 @@ in {
smtpd_tls_eecdh_grade = "ultra"; smtpd_tls_eecdh_grade = "ultra";
# Disable obselete protocols # Disable obselete protocols
smtpd_tls_protocols = [ smtpd_tls_protocols =
"TLSv1.2" [ "TLSv1.2" "TLSv1.1" "!TLSv1" "!SSLv2" "!SSLv3" ];
"TLSv1.1" smtp_tls_protocols = [ "TLSv1.2" "TLSv1.1" "!TLSv1" "!SSLv2" "!SSLv3" ];
"!TLSv1" smtpd_tls_mandatory_protocols =
"!SSLv2" [ "TLSv1.2" "TLSv1.1" "!TLSv1" "!SSLv2" "!SSLv3" ];
"!SSLv3" smtp_tls_mandatory_protocols =
]; [ "TLSv1.2" "TLSv1.1" "!TLSv1" "!SSLv2" "!SSLv3" ];
smtp_tls_protocols = [
"TLSv1.2"
"TLSv1.1"
"!TLSv1"
"!SSLv2"
"!SSLv3"
];
smtpd_tls_mandatory_protocols = [
"TLSv1.2"
"TLSv1.1"
"!TLSv1"
"!SSLv2"
"!SSLv3"
];
smtp_tls_mandatory_protocols = [
"TLSv1.2"
"TLSv1.1"
"!TLSv1"
"!SSLv2"
"!SSLv3"
];
smtp_tls_ciphers = "high"; smtp_tls_ciphers = "high";
smtpd_tls_ciphers = "high"; smtpd_tls_ciphers = "high";
smtp_tls_mandatory_ciphers = "high"; smtp_tls_mandatory_ciphers = "high";
smtpd_tls_mandatory_ciphers = "high"; smtpd_tls_mandatory_ciphers = "high";
smtpd_tls_mandatory_exclude_ciphers = ["MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL"]; smtpd_tls_mandatory_exclude_ciphers =
smtpd_tls_exclude_ciphers = ["MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL"]; [ "MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL" ];
smtp_tls_mandatory_exclude_ciphers = ["MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL"]; smtpd_tls_exclude_ciphers =
smtp_tls_exclude_ciphers = ["MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL"]; [ "MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL" ];
smtp_tls_mandatory_exclude_ciphers =
[ "MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL" ];
smtp_tls_exclude_ciphers =
[ "MD5" "DES" "ADH" "RC4" "PSD" "SRP" "3DES" "eNULL" "aNULL" ];
tls_preempt_cipherlist = "yes"; tls_preempt_cipherlist = "yes";
@ -286,8 +262,10 @@ in {
smtpd_sasl_security_options = "noanonymous"; smtpd_sasl_security_options = "noanonymous";
smtpd_sasl_local_domain = cfg.domain; smtpd_sasl_local_domain = cfg.domain;
smtpd_client_restrictions = "permit_sasl_authenticated,reject"; smtpd_client_restrictions = "permit_sasl_authenticated,reject";
smtpd_sender_restrictions = "reject_sender_login_mismatch,reject_unknown_sender_domain"; smtpd_sender_restrictions =
smtpd_recipient_restrictions = "reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject"; "reject_sender_login_mismatch,reject_unknown_sender_domain";
smtpd_recipient_restrictions =
"reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject";
cleanup_service_name = "submission-header-cleanup"; cleanup_service_name = "submission-header-cleanup";
}; };
@ -297,7 +275,11 @@ in {
privileged = true; privileged = true;
chroot = false; chroot = false;
command = "spawn"; command = "spawn";
args = [ "user=nobody" "argv=${pkgs.pypolicyd-spf}/bin/policyd-spf" "${policyd-spf}"]; args = [
"user=nobody"
"argv=${pkgs.pypolicyd-spf}/bin/policyd-spf"
"${policyd-spf}"
];
}; };
"submission-header-cleanup" = { "submission-header-cleanup" = {
type = "unix"; type = "unix";
@ -305,7 +287,8 @@ in {
chroot = false; chroot = false;
maxproc = 0; maxproc = 0;
command = "cleanup"; command = "cleanup";
args = ["-o" "header_checks=pcre:${submission-header-cleanup-rules}"]; args =
[ "-o" "header_checks=pcre:${submission-header-cleanup-rules}" ];
}; };
}; };
}; };