345 lines
10 KiB
Nix
345 lines
10 KiB
Nix
{ config, pkgs, ... }:
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let
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hostname = "mail.${config.networking.domain}";
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domain = config.networking.domain;
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rspamd-domain = "rspamd.${config.networking.domain}";
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dovecot-ldap-args = pkgs.writeText "ldap-args" ''
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uris = ldap://localhost
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dn = uid=search, ou=users, dc=ifsr, dc=de
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auth_bind = yes
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!include ${config.sops.secrets."dovecot_ldap_search".path}
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ldap_version = 3
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scope = subtree
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base = dc=ifsr, dc=de
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user_filter = (&(objectClass=posixAccount)(uid=%n))
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pass_filter = (&(objectClass=posixAccount)(uid=%n))
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'';
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# see https://www.kuketz-blog.de/e-mail-anbieter-ip-stripping-aus-datenschutzgruenden/
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header_cleanup = pkgs.writeText "header_cleanup_outgoing" ''
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/^\s*(Received: from)[^\n]*(.*)/ REPLACE $1 127.0.0.1 (localhost [127.0.0.1])$2
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/^\s*User-Agent/ IGNORE
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/^\s*X-Enigmail/ IGNORE
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/^\s*X-Mailer/ IGNORE
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/^\s*X-Originating-IP/ IGNORE
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/^\s*Mime-Version/ IGNORE
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'';
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in
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{
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sops.secrets."rspamd-password".owner = config.users.users.rspamd.name;
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sops.secrets."dovecot_ldap_search".owner = config.services.dovecot2.user;
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sops.secrets."postfix_ldap_aliases".owner = config.services.postfix.user;
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networking.firewall.allowedTCPPorts = [
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25 # insecure SMTP
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143
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465
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587 # SMTP
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993 # IMAP
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4190 # sieve
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];
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users.users.postfix.extraGroups = [ "opendkim" ];
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environment.etc = {
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"dovecot/sieve-pipe/sa-learn-spam.sh" = {
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text = ''
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#!/bin/sh
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${pkgs.rspamd}/bin/rspamc learn_spam
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'';
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mode = "0555";
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};
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"dovecot/sieve-pipe/sa-learn-ham.sh" = {
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text = ''
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#!/bin/sh
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${pkgs.rspamd}/bin/rspamc learn_ham
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'';
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mode = "0555";
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};
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"dovecot/sieve/report-spam.sieve" = {
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source = ./report-spam.sieve;
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user = "dovecot2";
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group = "dovecot2";
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mode = "0544";
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};
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"dovecot/sieve/report-ham.sieve" = {
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source = ./report-ham.sieve;
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user = "dovecot2";
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group = "dovecot2";
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mode = "0544";
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};
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};
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services = {
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postfix = {
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enable = true;
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enableSubmission = true;
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enableSubmissions = true;
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hostname = "${hostname}";
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domain = "${domain}";
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origin = "${domain}";
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destination = [ "${hostname}" "${domain}" "localhost" ];
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networksStyle = "host"; # localhost and own public IP
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sslCert = "/var/lib/acme/${hostname}/fullchain.pem";
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sslKey = "/var/lib/acme/${hostname}/key.pem";
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relayDomains = [ "hash:/var/lib/mailman/data/postfix_domains" ];
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config = {
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home_mailbox = "Maildir/";
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# hostname used in helo command. It is recommended to have this match the reverse dns entry
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smtp_helo_name = config.networking.rDNS;
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smtp_use_tls = true;
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# smtp_tls_security_level = "encrypt";
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smtpd_use_tls = true;
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# smtpd_tls_security_level = lib.mkForce "encrypt";
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# smtpd_tls_auth_only = true;
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smtpd_tls_protocols = [
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"!SSLv2"
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"!SSLv3"
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"!TLSv1"
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"!TLSv1.1"
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];
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# "reject_non_fqdn_hostname"
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smtpd_recipient_restrictions = [
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"permit_sasl_authenticated"
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"permit_mynetworks"
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"reject_unauth_destination"
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"reject_non_fqdn_sender"
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"reject_non_fqdn_recipient"
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"reject_unknown_sender_domain"
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"reject_unknown_recipient_domain"
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"reject_unauth_destination"
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"reject_unauth_pipelining"
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"reject_invalid_hostname"
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"check_policy_service inet:localhost:12340"
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];
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smtpd_relay_restrictions = [
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"permit_sasl_authenticated"
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"permit_mynetworks"
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"reject_unauth_destination"
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];
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smtp_header_checks = "pcre:${header_cleanup}";
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# smtpd_sender_login_maps = [ "ldap:${ldap-senders}" ];
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alias_maps = [ "hash:/etc/aliases" ];
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alias_database = [ "hash:/etc/aliases" ];
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# alias_maps = [ "hash:/etc/aliases" "ldap:${ldap-aliases}" ];
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smtpd_milters = [ "local:/run/opendkim/opendkim.sock" ];
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non_smtpd_milters = [ "local:/var/run/opendkim/opendkim.sock" ];
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smtpd_sasl_auth_enable = true;
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smtpd_sasl_path = "/var/lib/postfix/auth";
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smtpd_sasl_type = "dovecot";
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#mailman stuff
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mailbox_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp";
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transport_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" ];
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virtual_alias_maps = [ "hash:/var/lib/mailman/data/postfix_vmap" ];
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local_recipient_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" "ldap:${config.sops.secrets."postfix_ldap_aliases".path}" "$alias_maps" ];
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};
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};
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dovecot2 = {
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enable = true;
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enableImap = true;
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enableQuota = true;
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quotaGlobalPerUser = "10G";
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enableLmtp = true;
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enablePAM = false;
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mailLocation = "maildir:~/Maildir";
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sslServerCert = "/var/lib/acme/${hostname}/fullchain.pem";
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sslServerKey = "/var/lib/acme/${hostname}/key.pem";
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protocols = [ "imap" "sieve" ];
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mailPlugins = {
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globally.enable = [ "listescape" ];
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perProtocol = {
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imap = {
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enable = [ "imap_sieve" ];
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};
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lmtp = {
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enable = [ "sieve" ];
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};
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};
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};
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mailboxes = {
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Spam = {
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auto = "subscribe";
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specialUse = "Junk";
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autoexpunge = "60d";
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};
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Sent = {
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auto = "subscribe";
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specialUse = "Sent";
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};
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Drafts = {
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auto = "subscribe";
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specialUse = "Drafts";
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};
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Trash = {
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auto = "subscribe";
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specialUse = "Trash";
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};
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};
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modules = [
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pkgs.dovecot_pigeonhole
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];
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extraConfig = ''
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auth_username_format = %Ln
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passdb {
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driver = ldap
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args = ${dovecot-ldap-args}
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}
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userdb {
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driver = ldap
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args = ${dovecot-ldap-args}
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}
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service auth {
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unix_listener /var/lib/postfix/auth {
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group = postfix
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mode = 0660
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user = postfix
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}
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}
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service managesieve-login {
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inet_listener sieve {
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port = 4190
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}
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service_count = 1
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}
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namespace inbox {
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separator = /
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inbox = yes
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}
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service lmtp {
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unix_listener dovecot-lmtp {
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group = postfix
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mode = 0600
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user = postfix
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}
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client_limit = 1
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}
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plugin {
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sieve_plugins = sieve_imapsieve sieve_extprograms
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sieve_global_extensions = +vnd.dovecot.pipe
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sieve_pipe_bin_dir = /etc/dovecot/sieve-pipe
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# Spam: From elsewhere to Spam folder or flag changed in Spam folder
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imapsieve_mailbox1_name = Spam
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imapsieve_mailbox1_causes = COPY APPEND FLAG
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imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve
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# Ham: From Spam folder to elsewhere
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imapsieve_mailbox2_name = *
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imapsieve_mailbox2_from = Spam
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imapsieve_mailbox2_causes = COPY
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imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve
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# https://doc.dovecot.org/configuration_manual/plugins/listescape_plugin/
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listescape_char = "\\"
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}
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'';
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};
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opendkim = {
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enable = true;
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domains = "csl:${config.networking.domain}";
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selector = config.networking.hostName;
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configFile = pkgs.writeText "opendkim-config" ''
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UMask 0117
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'';
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};
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rspamd = {
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enable = true;
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postfix.enable = true;
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locals = {
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"worker-controller.inc".source = config.sops.secrets."rspamd-password".path;
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"redis.conf".text = ''
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read_servers = "127.0.0.1";
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write_servers = "127.0.0.1";
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'';
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# headers in spamassasin style to not break old sieve scripts
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"worker-proxy.inc".text = ''
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spam_header = "X-Spam-Flag";
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'';
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"milter_headers.conf".text = ''
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use = ["x-spam-level", "x-spam-status"];
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'';
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"neural.conf".text = ''
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servers = "127.0.0.1:6379";
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enabled = true;
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'';
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"neural_group.conf".text = ''
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symbols = {
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"NEURAL_SPAM" {
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weight = 0.5; # fairly low weight since we don't know how this will behave
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description = "Neural network spam";
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}
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"NEURAL_HAM" {
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weight = -0.5;
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description = "Neural network ham";
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}
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}
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'';
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"multimap.conf".text = ''
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WHITELIST_SENDER_DOMAIN {
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type = "from";
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filter = "email:domain";
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map = "/var/lib/rspamd/whitelist.sender.domain.map";
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action = "accept";
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}
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WHITELIST_SENDER_EMAIL {
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type = "from";
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map = "/var/lib/rspamd/whitelist.sender.email.map";
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action = "accept";
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}
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BLACKLIST_SENDER_DOMAIN {
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type = "from";
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filter = "email:domain";
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map = "/var/lib/rspamd/blacklist.sender.domain.map";
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action = "reject";
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}
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BLACKLIST_SENDER_EMAIL {
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type = "from";
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map = "/var/lib/rspamd/blacklist.sender.email.map";
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action = "reject";
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}
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'';
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};
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};
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redis = {
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vmOverCommit = true;
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servers.rspamd = {
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enable = true;
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port = 6379;
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};
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};
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nginx = {
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enable = true;
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recommendedGzipSettings = true;
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recommendedOptimisation = true;
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recommendedProxySettings = true;
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recommendedTlsSettings = true;
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virtualHosts."${hostname}" = {
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forceSSL = true;
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enableACME = true;
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};
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virtualHosts."${rspamd-domain}" = {
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forceSSL = true;
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enableACME = true;
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locations = {
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"/" = {
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proxyPass = "http://127.0.0.1:11334";
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proxyWebsockets = true;
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};
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};
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};
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};
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};
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security.acme.certs."${domain}" = {
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reloadServices = [
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"postfix.service"
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"dovecot2.service"
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];
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};
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}
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