hosts/losurdo/postfix.nix

   1 { pkgs, lib, config, ... }:
   2 let
   3   inherit (lib) types;
   4   inherit (config) networking users;
   5   inherit (config.services) postfix;
   6 in
   7 {
   8 imports = [
   9   #postfix/autogeree.net.nix
  10   #postfix/sourcephile.fr.nix
  11 ];
  12 users.groups.acme.members = [ postfix.user ];
  13 networking.nftables.ruleset = ''
  14   table inet filter {
  15     chain input-net {
  16       #tcp dport 25 counter accept comment "postfix: SMTP"
  17       #tcp dport 465 counter accept comment "postfix: submissions"
  18     }
  19     chain output-net {
  20       skuid ${postfix.user} tcp dport smtp counter accept comment "postfix: SMTP"
  21     }
  22   }
  23 '';
  24 services.postfix = {
  25   enable = true;
  26   networksStyle = "host";
  27   hostname ="${networking.hostName}.${networking.domain}";
  28   domain = networking.domain;
  29   origin = "$myhostname";
  30   destination = [
  31     "localhost"
  32     "localhost.localdomain"
  33     "$myhostname"
  34   ];
  35   postmasterAlias = "root";
  36   rootAlias = "root@${networking.domain}";
  37   sslKey = "/var/lib/acme/${networking.domain}/key.pem";
  38   sslCert = "/var/lib/acme/${networking.domain}/fullchain.pem";
  39   networks = [
  40     "127.0.0.0/8"
  41     "[::1]/128"
  42   ];
  43   setSendmail = true;
  44   # Parse the extension in email address, eg. contact+extension@
  45   recipientDelimiter = "+";
  46   config = {
  47     debug_peer_level = "4";
  48     debug_peer_list = [
  49       #"chomsky.autogeree.net"
  50       #"localhost"
  51       #"mail.sourcephile.fr"
  52     ];
  53
  54     #
  55     # Sending to the world
  56     #
  57     # Appending .domain is the MUA's job
  58     append_dot_mydomain = false;
  59     smtp_body_checks = "";
  60     #smtp_cname_overrides_servername = false;
  61     smtp_connect_timeout = "60s";
  62     #smtp_header_checks = "regexp:/var/lib/postfix/smtp_header_checks";
  63     smtp_mime_header_checks = "";
  64     smtp_nested_header_checks = "";
  65     smtp_tls_exclude_ciphers = [ "ADH" "MD5" "CAMELLIA" "SEED" "3DES" "DES" "RC4" "eNULL" "aNULL" ];
  66     #smtp_tls_fingerprint_digest = "sha1";
  67     smtp_tls_loglevel = "1";
  68     #smtp_tls_note_starttls_offer = true;
  69     #smtp_tls_policy_maps = "hash:/var/lib/postfix/conf/tls_policy";
  70     # Only allow TLSv* protocols
  71     smtp_tls_protocols = [ "!SSLv2" "!SSLv3" ];
  72     #smtp_tls_scert_verifydepth = "5";
  73     #smtp_tls_secure_cert_match = [ "nexthop" "dot-nexthop" ];
  74     smtp_tls_security_level = "may";
  75     smtp_tls_session_cache_database = "btree:$data_directory/smtp_tls_session_cache";
  76     #smtp_tls_session_cache_timeout = "3600s";
  77     #smtp_tls_verify_cert_match = "hostname";
  78
  79     #
  80     # Receiving from the world
  81     #
  82     message_size_limit = "20480000";
  83     maximal_queue_lifetime = "5d";
  84     default_extra_recipient_limit = "5000";
  85     line_length_limit = "2048";
  86     duplicate_filter_limit = "5000";
  87     # Stops mail from poorly written software
  88     strict_rfc821_envelopes = true;
  89     mime_header_checks = [];
  90     milter_header_checks = [];
  91     nested_header_checks = [];
  92     body_checks = [];
  93     content_filter = "";
  94     permit_mx_backup_networks = [];
  95     propagate_unmatched_extensions = [ "canonical" "virtual" "alias" ];
  96     #masquerade_classes = [ "envelope_sender" "header_sender" "header_recipient" ];
  97     #masquerade_domains = "";
  98     #masquerade_exceptions = "root";
  99     queue_minfree = "0";
 100     # Stops some techniques used to harvest email addresses
 101     disable_vrfy_command = true;
 102     enable_long_queue_ids = false;
 103     # Useful to test restrictions
 104     smtpd_authorized_xclient_hosts = "127.0.0.1";
 105     smtpd_banner = "$myhostname ESMTP $mail_name (NixOS)";
 106     smtpd_client_connection_count_limit = "50";
 107     smtpd_client_connection_rate_limit = "0";
 108     smtpd_client_event_limit_exceptions = "$mynetworks";
 109     smtpd_client_message_rate_limit = "0";
 110     smtpd_client_new_tls_session_rate_limit = "0";
 111     smtpd_client_port_logging = false;
 112     smtpd_client_recipient_rate_limit = "0";
 113     # Ban 5 sec on error
 114     smtpd_error_sleep_time = "5";
 115     # Needed to enforce reject_unknown_helo_hostname
 116     smtpd_helo_required = true;
 117     smtpd_helo_restrictions = [
 118       "reject_invalid_helo_hostname"
 119       "reject_non_fqdn_helo_hostname"
 120       # Don't talk to mail systems that don't know their own hostname.
 121       "reject_unknown_helo_hostname"
 122       "permit"
 123     ];
 124     smtpd_client_restrictions = [
 125     ];
 126     # Set in postfix/*.nix and used in submissions/smptd
 127     # with reject_sender_login_mismatch
 128     smtpd_sender_login_maps = [];
 129     smtpd_sender_restrictions = [
 130       "reject_non_fqdn_sender"
 131       "permit"
 132     ];
 133     smtpd_reject_unlisted_recipient = true;
 134     # Check the RCPT TO, before smtpd_recipient_restrictions
 135     # Restrictions based on what is allowed or not,
 136     # these are applied before smtpd_recipient_restrictions
 137     smtpd_relay_restrictions = [
 138       "permit_mynetworks"
 139       # Check the recipient's address in virtual_mailbox_domains and virtual_mailbox_maps
 140       "permit_auth_destination"
 141       # The world is only authorized to use our relay for the above destinations.
 142       "reject"
 143     ];
 144     # Restrictions based on what is working or not
 145     smtpd_recipient_restrictions = [
 146       # Reject if the domain is not fully qualified
 147       "reject_non_fqdn_recipient"
 148       # Reject if the domain is not working, even before bothering to check the address
 149       "reject_unknown_recipient_domain"
 150       # Reject if the address is not working
 151       # WARNING: this does not work if the recipient is greylisting.
 152       # WARNING: verify(8) has a cache, dumpable if verify(8) is stopped, with:
 153       # postmap -s btree:/var/lib/postfix/data/verify_cache
 154       #"reject_unverified_recipient"
 155       "permit"
 156     ];
 157     # Trust the verify database
 158     #unverified_recipient_reject_code = "550";
 159     smtpd_data_restrictions = [
 160       # Force the smtpd's client to wait OK before sending
 161       "reject_unauth_pipelining"
 162       "permit"
 163     ];
 164     smtpd_end_of_data_restrictions = [
 165       # Enforce mail volume quota via policy service callouts.
 166       #check_policy_service unix:private/policy
 167     ];
 168     #smtpd_milters = "";
 169     smtpd_peername_lookup = true;
 170     smtpd_recipient_limit = "5000";
 171     smtpd_recipient_overshoot_limit = "5000";
 172     #smtpd_restriction_classes = "";
 173     #smtpd_sasl_auth_enable = true;
 174     #smtpd_sasl_path = "private/auth";
 175     #smtpd_sasl_security_options = "noanonymous";
 176     #smtpd_sasl_type = "dovecot";
 177     smtpd_starttls_timeout = "300s";
 178     #smtpd_tls_always_issue_session_ids = true;
 179     #smtpd_tls_CApath = "/etc/postfix/x509/ca/";
 180     smtpd_tls_ask_ccert = false;
 181     #smtpd_tls_ccert_verifydepth = "5";
 182     smtpd_tls_ciphers = "high";
 183     smtpd_tls_eecdh_grade = "auto";
 184     # Disable weak ciphers as reported by https://ssl-tools.net
 185     # https://serverfault.com/questions/744168/how-to-disable-rc4-on-postfix
 186     smtpd_tls_exclude_ciphers = [ "ADH" "MD5" "CAMELLIA" "SEED" "3DES" "DES" "RC4" "eNULL" "aNULL" ];
 187     smtpd_tls_fingerprint_digest = "sha512";
 188     # Log only a summary message on TLS handshake completion
 189     smtpd_tls_loglevel = "1";
 190     smtpd_tls_mandatory_ciphers = "high";
 191     smtpd_tls_mandatory_protocols = [ "!SSLv2" "!SSLv3" ];
 192     # Only allow TLSv*
 193     smtpd_tls_protocols = [ "!SSLv2" "!SSLv3" ];
 194     #smtpd_tls_received_header = false;
 195     smtpd_tls_req_ccert = false;
 196     # Postfix 2.3 and later
 197     # encrypt
 198     #  Mandatory TLS encryption: announce STARTTLS support to SMTP clients, and require that clients use TLS
 199     #  encryption. According to [1720]RFC 2487 this MUST NOT be applied in case of a publicly-referenced
 200     #  SMTP server. Instead, this option should be used only on dedicated servers.
 201     smtpd_tls_security_level = "may";
 202     smtpd_tls_session_cache_database = "btree:$data_directory/smtpd_tls_session_cache";
 203     #smtpd_tls_session_cache_timeout = "3600s";
 204     #smtpd_tls_chain_files =
 205
 206     relayhost = [];
 207     #relay_clientcerts = hash:/var/lib/postfix/conf/relay_clientcerts
 208     # This is where to put backup MX domains
 209     relay_domains = [];
 210     relay_recipient_maps = [];
 211
 212     # Use a non blocking source of randomness
 213     tls_random_source = "dev:/dev/urandom";
 214     # Map each domain to a specific X.509 certificate
 215     tls_server_sni_maps = "hash:/run/keys/postfix-sni";
 216
 217     # Only explicitely aliased accounts have a mail, not all the passwd
 218     #local_recipient_maps = "$alias_maps";
 219     # Note that the local transport rewrites the envelope recipient
 220     # according to the alias_maps, and thus the aliasing is transparent
 221     # to the nexthop (eg. dovecot)
 222     local_transport = "local:$myhostname";
 223     # No console bell on new mail
 224     biff = false;
 225     forward_path = [
 226       /*
 227       "$home/.forward''${recipient_delimiter}''${extension}"
 228       */
 229       "$home/.forward"
 230     ];
 231
 232     # Filled by the postfix/*.nix
 233     virtual_mailbox_domains = [];
 234     # Completed by the postfix/*.nix
 235     virtual_mailbox_maps = [
 236       #"hash:/etc/postfix/virtual"
 237     ];
 238     #virtual_transport = "lmtp:unix:private/dovecot-lmtp";
 239     /*
 240     dovecot_destination_recipient_limit = "1";
 241     virtual_transport = "dovecot";
 242     */
 243
 244     # There is no fallback
 245     fallback_transport = "";
 246   };
 247   transport = ''
 248     sourcephile.wg local:losurdo
 249   '';
 250   virtualMapType = "hash";
 251   masterConfig =
 252     let
 253       mkVal = value:
 254         if lib.isList value
 255         then lib.concatStringsSep "," value
 256         else
 257           if value == true then "yes"
 258           else if value == false then "no"
 259           else toString value;
 260       mkKeyVal = opt: val: [ "-o" (opt + "=" + mkVal val) ];
 261       mkArgs = args: lib.concatLists (lib.mapAttrsToList mkKeyVal args);
 262     in {
 263     pickup = {
 264       args = mkArgs {
 265         cleanup_service_name = "submissions-header-cleanup";
 266       };
 267     };
 268     /*
 269     # Implicit TLS on port 465
 270     # https://tools.ietf.org/html/rfc8314#section-3.3
 271     submissions = {
 272       type = "inet";
 273       private = false;
 274       command = "smtpd";
 275       args = mkArgs {
 276         syslog_name = "postfix/submissions";
 277         # Implicit TLS, not STARTTLS
 278         smtpd_tls_wrappermode = true;
 279         smtpd_tls_mandatory_protocols = [
 280           "TLSv1.3"
 281           # FIXME: to be removed when K-9 Mail will support TLSv1.3,
 282           # K-9 Mail 5.600 does not.
 283           "TLSv1.2"
 284         ];
 285         milter_macro_daemon_name = "ORIGINATING";
 286         smtpd_helo_restrictions = [
 287           "permit_sasl_authenticated"
 288         ] ++ postfix.config.smtpd_helo_restrictions;
 289         smtpd_relay_restrictions = [
 290           # SASL authorizes to send to the world
 291           "permit_sasl_authenticated"
 292           "reject"
 293         ];
 294         smtpd_sasl_auth_enable = true;
 295         smtpd_sasl_type = "dovecot";
 296         smtpd_sasl_path = "private/auth";
 297         smtpd_sasl_local_domain = "";
 298         # Offer SASL authentication only after a TLS-encrypted session has been established
 299         smtpd_tls_auth_only = true;
 300         smtpd_sasl_tls_security_options = [ "noanonymous" ];
 301         # Do not put SASL logins in mail headers
 302         smtpd_sasl_authenticated_header = false;
 303         # Who cares about (old) Outlook
 304         broken_sasl_auth_clients = false;
 305         smtpd_sender_restrictions = [
 306           "reject_non_fqdn_sender"
 307           # Check that the SASL user is using only its own
 308           # mail addresses on the envelope, as indicated in smtpd_sender_login_maps
 309           "reject_sender_login_mismatch"
 310           "permit"
 311         ];
 312         # No X.509 certificates for users, for now
 313         smtpd_tls_ask_ccert = false;
 314         smtpd_tls_ccert_verifydepth = 0;
 315         smtpd_tls_loglevel = 1;
 316         smtpd_tls_req_ccert = false;
 317         cleanup_service_name = "submissions-header-cleanup";
 318       };
 319     };
 320     */
 321   };
 322   extraMasterConf = ''
 323   '';
 324 };
 325 }