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   #add rule inet filter net2fw tcp dport 25 counter accept comment "SMTP"
  15   #add rule inet filter net2fw tcp dport 465 counter accept comment "submissions"
  16   add rule inet filter fw2net meta skuid ${postfix.user} tcp dport 25 counter accept comment "SMTP"
  17 '';
  18 services.postfix = {
  19   enable = true;
  20   networksStyle = "host";
  21   hostname ="${networking.hostName}.${networking.domain}";
  22   domain = networking.domain;
  23   origin = "$myhostname";
  24   destination = [
  25     "localhost"
  26     "localhost.localdomain"
  27     "$myhostname"
  28   ];
  29   postmasterAlias = "root";
  30   rootAlias = "root@${networking.domain}";
  31   sslKey = "/var/lib/acme/${networking.domain}/key.pem";
  32   sslCert = "/var/lib/acme/${networking.domain}/fullchain.pem";
  33   networks = [
  34     "127.0.0.0/8"
  35     "[::1]/128"
  36   ];
  37   setSendmail = true;
  38   # Parse the extension in email address, eg. contact+extension@
  39   recipientDelimiter = "+";
  40   config = {
  41     debug_peer_level = "4";
  42     debug_peer_list = [
  43       #"chomsky.autogeree.net"
  44       #"localhost"
  45       #"mail.sourcephile.fr"
  46     ];
  47
  48     #
  49     # Sending to the world
  50     #
  51     # Appending .domain is the MUA's job
  52     append_dot_mydomain = false;
  53     smtp_body_checks = "";
  54     #smtp_cname_overrides_servername = false;
  55     smtp_connect_timeout = "60s";
  56     #smtp_header_checks = "regexp:/var/lib/postfix/smtp_header_checks";
  57     smtp_mime_header_checks = "";
  58     smtp_nested_header_checks = "";
  59     smtp_tls_exclude_ciphers = [ "ADH" "MD5" "CAMELLIA" "SEED" "3DES" "DES" "RC4" "eNULL" "aNULL" ];
  60     #smtp_tls_fingerprint_digest = "sha1";
  61     smtp_tls_loglevel = "1";
  62     #smtp_tls_note_starttls_offer = true;
  63     #smtp_tls_policy_maps = "hash:/var/lib/postfix/conf/tls_policy";
  64     # Only allow TLSv* protocols
  65     smtp_tls_protocols = [ "!SSLv2" "!SSLv3" ];
  66     #smtp_tls_scert_verifydepth = "5";
  67     #smtp_tls_secure_cert_match = [ "nexthop" "dot-nexthop" ];
  68     smtp_tls_security_level = "may";
  69     smtp_tls_session_cache_database = "btree:$data_directory/smtp_tls_session_cache";
  70     #smtp_tls_session_cache_timeout = "3600s";
  71     #smtp_tls_verify_cert_match = "hostname";
  72
  73     #
  74     # Receiving from the world
  75     #
  76     message_size_limit = "20480000";
  77     maximal_queue_lifetime = "5d";
  78     default_extra_recipient_limit = "5000";
  79     line_length_limit = "2048";
  80     duplicate_filter_limit = "5000";
  81     # Stops mail from poorly written software
  82     strict_rfc821_envelopes = true;
  83     mime_header_checks = [];
  84     milter_header_checks = [];
  85     nested_header_checks = [];
  86     body_checks = [];
  87     content_filter = "";
  88     permit_mx_backup_networks = [];
  89     propagate_unmatched_extensions = [ "canonical" "virtual" "alias" ];
  90     #masquerade_classes = [ "envelope_sender" "header_sender" "header_recipient" ];
  91     #masquerade_domains = "";
  92     #masquerade_exceptions = "root";
  93     queue_minfree = "0";
  94     # Stops some techniques used to harvest email addresses
  95     disable_vrfy_command = true;
  96     enable_long_queue_ids = false;
  97     # Useful to test restrictions
  98     smtpd_authorized_xclient_hosts = "127.0.0.1";
  99     smtpd_banner = "$myhostname ESMTP $mail_name (NixOS)";
 100     smtpd_client_connection_count_limit = "50";
 101     smtpd_client_connection_rate_limit = "0";
 102     smtpd_client_event_limit_exceptions = "$mynetworks";
 103     smtpd_client_message_rate_limit = "0";
 104     smtpd_client_new_tls_session_rate_limit = "0";
 105     smtpd_client_port_logging = false;
 106     smtpd_client_recipient_rate_limit = "0";
 107     # Ban 5 sec on error
 108     smtpd_error_sleep_time = "5";
 109     # Needed to enforce reject_unknown_helo_hostname
 110     smtpd_helo_required = true;
 111     smtpd_helo_restrictions = [
 112       "reject_invalid_helo_hostname"
 113       "reject_non_fqdn_helo_hostname"
 114       # Don't talk to mail systems that don't know their own hostname.
 115       "reject_unknown_helo_hostname"
 116       "permit"
 117     ];
 118     smtpd_client_restrictions = [
 119     ];
 120     # Set in postfix/*.nix and used in submissions/smptd
 121     # with reject_sender_login_mismatch
 122     smtpd_sender_login_maps = [];
 123     smtpd_sender_restrictions = [
 124       "reject_non_fqdn_sender"
 125       "permit"
 126     ];
 127     smtpd_reject_unlisted_recipient = true;
 128     # Check the RCPT TO, before smtpd_recipient_restrictions
 129     # Restrictions based on what is allowed or not,
 130     # these are applied before smtpd_recipient_restrictions
 131     smtpd_relay_restrictions = [
 132       "permit_mynetworks"
 133       # Check the recipient's address in virtual_mailbox_domains and virtual_mailbox_maps
 134       "permit_auth_destination"
 135       # The world is only authorized to use our relay for the above destinations.
 136       "reject"
 137     ];
 138     # Restrictions based on what is working or not
 139     smtpd_recipient_restrictions = [
 140       # Reject if the domain is not fully qualified
 141       "reject_non_fqdn_recipient"
 142       # Reject if the domain is not working, even before bothering to check the address
 143       "reject_unknown_recipient_domain"
 144       # Reject if the address is not working
 145       # WARNING: this does not work if the recipient is greylisting.
 146       # WARNING: verify(8) has a cache, dumpable if verify(8) is stopped, with:
 147       # postmap -s btree:/var/lib/postfix/data/verify_cache
 148       #"reject_unverified_recipient"
 149       "permit"
 150     ];
 151     # Trust the verify database
 152     #unverified_recipient_reject_code = "550";
 153     smtpd_data_restrictions = [
 154       # Force the smtpd's client to wait OK before sending
 155       "reject_unauth_pipelining"
 156       "permit"
 157     ];
 158     smtpd_end_of_data_restrictions = [
 159       # Enforce mail volume quota via policy service callouts.
 160       #check_policy_service unix:private/policy
 161     ];
 162     #smtpd_milters = "";
 163     smtpd_peername_lookup = true;
 164     smtpd_recipient_limit = "5000";
 165     smtpd_recipient_overshoot_limit = "5000";
 166     #smtpd_restriction_classes = "";
 167     #smtpd_sasl_auth_enable = true;
 168     #smtpd_sasl_path = "private/auth";
 169     #smtpd_sasl_security_options = "noanonymous";
 170     #smtpd_sasl_type = "dovecot";
 171     smtpd_starttls_timeout = "300s";
 172     #smtpd_tls_always_issue_session_ids = true;
 173     #smtpd_tls_CApath = "/etc/postfix/x509/ca/";
 174     smtpd_tls_ask_ccert = false;
 175     #smtpd_tls_ccert_verifydepth = "5";
 176     smtpd_tls_ciphers = "high";
 177     smtpd_tls_eecdh_grade = "auto";
 178     # Disable weak ciphers as reported by https://ssl-tools.net
 179     # https://serverfault.com/questions/744168/how-to-disable-rc4-on-postfix
 180     smtpd_tls_exclude_ciphers = [ "ADH" "MD5" "CAMELLIA" "SEED" "3DES" "DES" "RC4" "eNULL" "aNULL" ];
 181     smtpd_tls_fingerprint_digest = "sha512";
 182     # Log only a summary message on TLS handshake completion
 183     smtpd_tls_loglevel = "1";
 184     smtpd_tls_mandatory_ciphers = "high";
 185     smtpd_tls_mandatory_protocols = [ "!SSLv2" "!SSLv3" ];
 186     # Only allow TLSv*
 187     smtpd_tls_protocols = [ "!SSLv2" "!SSLv3" ];
 188     #smtpd_tls_received_header = false;
 189     smtpd_tls_req_ccert = false;
 190     # Postfix 2.3 and later
 191     # encrypt
 192     #  Mandatory TLS encryption: announce STARTTLS support to SMTP clients, and require that clients use TLS
 193     #  encryption. According to [1720]RFC 2487 this MUST NOT be applied in case of a publicly-referenced
 194     #  SMTP server. Instead, this option should be used only on dedicated servers.
 195     smtpd_tls_security_level = "may";
 196     smtpd_tls_session_cache_database = "btree:$data_directory/smtpd_tls_session_cache";
 197     #smtpd_tls_session_cache_timeout = "3600s";
 198     #smtpd_tls_chain_files =
 199
 200     relayhost = [];
 201     #relay_clientcerts = hash:/var/lib/postfix/conf/relay_clientcerts
 202     # This is where to put backup MX domains
 203     relay_domains = [];
 204     relay_recipient_maps = [];
 205
 206     # Use a non blocking source of randomness
 207     tls_random_source = "dev:/dev/urandom";
 208     # Map each domain to a specific X.509 certificate
 209     tls_server_sni_maps = "hash:/run/keys/postfix-sni";
 210
 211     # Only explicitely aliased accounts have a mail, not all the passwd
 212     #local_recipient_maps = "$alias_maps";
 213     # Note that the local transport rewrites the envelope recipient
 214     # according to the alias_maps, and thus the aliasing is transparent
 215     # to the nexthop (eg. dovecot)
 216     local_transport = "local:$myhostname";
 217     # No console bell on new mail
 218     biff = false;
 219     forward_path = [
 220       /*
 221       "$home/.forward''${recipient_delimiter}''${extension}"
 222       */
 223       "$home/.forward"
 224     ];
 225
 226     # Filled by the postfix/*.nix
 227     virtual_mailbox_domains = [];
 228     # Completed by the postfix/*.nix
 229     virtual_mailbox_maps = [
 230       #"hash:/etc/postfix/virtual"
 231     ];
 232     #virtual_transport = "lmtp:unix:private/dovecot-lmtp";
 233     /*
 234     dovecot_destination_recipient_limit = "1";
 235     virtual_transport = "dovecot";
 236     */
 237
 238     # There is no fallback
 239     fallback_transport = "";
 240   };
 241   transport = ''
 242     sourcephile.wg local:losurdo
 243   '';
 244   virtualMapType = "hash";
 245   masterConfig =
 246     let
 247       mkVal = value:
 248         if lib.isList value
 249         then lib.concatStringsSep "," value
 250         else
 251           if value == true then "yes"
 252           else if value == false then "no"
 253           else toString value;
 254       mkKeyVal = opt: val: [ "-o" (opt + "=" + mkVal val) ];
 255       mkArgs = args: lib.concatLists (lib.mapAttrsToList mkKeyVal args);
 256     in {
 257     pickup = {
 258       args = mkArgs {
 259         cleanup_service_name = "submissions-header-cleanup";
 260       };
 261     };
 262     /*
 263     # Implicit TLS on port 465
 264     # https://tools.ietf.org/html/rfc8314#section-3.3
 265     submissions = {
 266       type = "inet";
 267       private = false;
 268       command = "smtpd";
 269       args = mkArgs {
 270         syslog_name = "postfix/submissions";
 271         # Implicit TLS, not STARTTLS
 272         smtpd_tls_wrappermode = true;
 273         smtpd_tls_mandatory_protocols = [
 274           "TLSv1.3"
 275           # FIXME: to be removed when K-9 Mail will support TLSv1.3,
 276           # K-9 Mail 5.600 does not.
 277           "TLSv1.2"
 278         ];
 279         milter_macro_daemon_name = "ORIGINATING";
 280         smtpd_helo_restrictions = [
 281           "permit_sasl_authenticated"
 282         ] ++ postfix.config.smtpd_helo_restrictions;
 283         smtpd_relay_restrictions = [
 284           # SASL authorizes to send to the world
 285           "permit_sasl_authenticated"
 286           "reject"
 287         ];
 288         smtpd_sasl_auth_enable = true;
 289         smtpd_sasl_type = "dovecot";
 290         smtpd_sasl_path = "private/auth";
 291         smtpd_sasl_local_domain = "";
 292         # Offer SASL authentication only after a TLS-encrypted session has been established
 293         smtpd_tls_auth_only = true;
 294         smtpd_sasl_tls_security_options = [ "noanonymous" ];
 295         # Do not put SASL logins in mail headers
 296         smtpd_sasl_authenticated_header = false;
 297         # Who cares about (old) Outlook
 298         broken_sasl_auth_clients = false;
 299         smtpd_sender_restrictions = [
 300           "reject_non_fqdn_sender"
 301           # Check that the SASL user is using only its own
 302           # mail addresses on the envelope, as indicated in smtpd_sender_login_maps
 303           "reject_sender_login_mismatch"
 304           "permit"
 305         ];
 306         # No X.509 certificates for users, for now
 307         smtpd_tls_ask_ccert = false;
 308         smtpd_tls_ccert_verifydepth = 0;
 309         smtpd_tls_loglevel = 1;
 310         smtpd_tls_req_ccert = false;
 311         cleanup_service_name = "submissions-header-cleanup";
 312       };
 313     };
 314     */
 315   };
 316   extraMasterConf = ''
 317   '';
 318 };
 319 }