287 lines
7.7 KiB
Nix
287 lines
7.7 KiB
Nix
{ config, lib, pkgs, environment, ... }:
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with lib;
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let
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cfg = config.fudo.mail-server;
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state-directory = "${cfg.state-directory}/dovecot";
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pipe-bin = pkgs.stdenv.mkDerivation {
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name = "pipe_bin";
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src = ./dovecot/pipe_bin;
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buildInputs = with pkgs; [ makeWrapper coreutils bash rspamd ];
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buildCommand = ''
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mkdir -p $out/pipe/bin
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cp $src/* $out/pipe/bin/
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chmod a+x $out/pipe/bin/*
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patchShebangs $out/pipe/bin
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for file in $out/pipe/bin/*; do
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wrapProgram $file \
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--set PATH "${pkgs.coreutils}/bin:${pkgs.rspamd}/bin"
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done
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'';
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};
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ldap-conf = filename: config:
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let
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ssl-config = if config.ca == null then ''
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tls = no
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tls_require_cert = try
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'' else ''
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tls_ca_cert_file = ${config.ca}
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tls = yes
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tls_require_cert = try
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'';
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in
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pkgs.writeText filename ''
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uris = ${concatStringsSep " " config.server-urls}
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ldap_version = 3
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dn = ${config.reader-dn}
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dnpass = ${config.reader-passwd}
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auth_bind = yes
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auth_bind_userdn = uid=%u,ou=members,dc=fudo,dc=org
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base = dc=fudo,dc=org
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${ssl-config}
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'';
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ldap-passwd-entry = ldap-config: ''
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passdb {
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driver = ldap
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args = ${ldap-conf "ldap-passdb.conf" ldap-config}
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}
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'';
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ldapOpts = {
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options = with types; {
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ca = mkOption {
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type = nullOr str;
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description = "The path to the CA cert used to sign the LDAP server certificate.";
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default = null;
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};
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server-urls = mkOption {
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type = listOf str;
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description = "A list of LDAP server URLs used for authentication.";
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};
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reader-dn = mkOption {
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type = str;
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description = ''
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DN to use for reading user information. Needs access to homeDirectory,
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uidNumber, gidNumber, and uid, but not password attributes.
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'';
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};
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reader-passwd = mkOption {
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type = str;
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description = ''
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Password for the user specified in ldap-reader-dn.
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'';
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};
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};
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};
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dovecot-user = config.services.dovecot2.user;
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in {
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options.fudo.mail-server.dovecot = with types; {
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ssl-private-key = mkOption {
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type = str;
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description = "Location of the server SSL private key.";
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};
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ssl-certificate = mkOption {
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type = str;
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description = "Location of the server SSL certificate.";
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};
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ldap = mkOption {
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type = nullOr (submodule ldapOpts);
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default = null;
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description = ''
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LDAP auth server configuration. If omitted, the server will use local authentication.
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'';
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};
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};
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config = mkIf cfg.enable {
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services.prometheus.exporters.dovecot = mkIf cfg.monitoring {
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enable = true;
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scopes = ["user" "global"];
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listenAddress = "127.0.0.1";
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port = 9166;
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socketPath = "/var/run/dovecot2/old-stats";
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};
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services.dovecot2 = {
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enable = true;
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enableImap = true;
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enableLmtp = true;
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enablePop3 = true;
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enablePAM = cfg.dovecot.ldap == null;
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createMailUser = true;
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mailUser = cfg.mail-user;
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mailGroup = cfg.mail-group;
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mailLocation = "maildir:${cfg.mail-directory}/%u/";
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sslServerCert = cfg.dovecot.ssl-certificate;
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sslServerKey = cfg.dovecot.ssl-private-key;
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modules = [ pkgs.dovecot_pigeonhole ];
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protocols = [ "sieve" ];
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sieveScripts = {
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after = builtins.toFile "spam.sieve" ''
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require "fileinto";
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if header :is "X-Spam" "Yes" {
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fileinto "Junk";
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stop;
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}
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'';
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};
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mailboxes = cfg.mailboxes;
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extraConfig = ''
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#Extra Config
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${optionalString cfg.monitoring ''
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# The prometheus exporter still expects an older style of metrics
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mail_plugins = $mail_plugins old_stats
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service old-stats {
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unix_listener old-stats {
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user = dovecot-exporter
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group = dovecot-exporter
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}
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}
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''}
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${lib.optionalString cfg.debug ''
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mail_debug = yes
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auth_debug = yes
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verbose_ssl = yes
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''}
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protocol imap {
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mail_max_userip_connections = ${toString cfg.max-user-connections}
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mail_plugins = $mail_plugins imap_sieve
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}
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protocol pop3 {
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mail_max_userip_connections = ${toString cfg.max-user-connections}
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}
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protocol lmtp {
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mail_plugins = $mail_plugins sieve
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}
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mail_access_groups = ${cfg.mail-group}
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ssl = required
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# When looking up usernames, just use the name, not the full address
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auth_username_format = %n
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service lmtp {
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# Enable logging in debug mode
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${optionalString cfg.debug "executable = lmtp -L"}
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# Unix socket for postfix to deliver messages via lmtp
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unix_listener dovecot-lmtp {
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user = "postfix"
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group = ${cfg.mail-group}
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mode = 0600
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}
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# Drop privs, since all mail is owned by one user
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# user = ${cfg.mail-user}
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# group = ${cfg.mail-group}
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user = root
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}
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auth_mechanisms = login plain
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${optionalString (cfg.dovecot.ldap != null)
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(ldap-passwd-entry cfg.dovecot.ldap)}
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userdb {
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driver = static
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args = uid=${toString cfg.mail-user-id} home=${cfg.mail-directory}/%u
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}
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# Used by postfix to authorize users
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service auth {
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unix_listener auth {
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mode = 0660
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user = "${config.services.postfix.user}"
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group = ${cfg.mail-group}
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}
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unix_listener auth-userdb {
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mode = 0660
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user = "${config.services.postfix.user}"
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group = ${cfg.mail-group}
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}
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}
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service auth-worker {
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user = root
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}
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service imap {
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vsz_limit = 1024M
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}
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namespace inbox {
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separator = "/"
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inbox = yes
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}
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plugin {
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sieve_plugins = sieve_imapsieve sieve_extprograms
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sieve = file:/var/sieve/%u/scripts;active=/var/sieve/%u/active.sieve
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sieve_default = file:/var/sieve/%u/default.sieve
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sieve_default_name = default
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# From elsewhere to Spam folder
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imapsieve_mailbox1_name = Junk
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imapsieve_mailbox1_causes = COPY
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imapsieve_mailbox1_before = file:${state-directory}/imap_sieve/report-spam.sieve
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# From Spam folder to elsewhere
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imapsieve_mailbox2_name = *
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imapsieve_mailbox2_from = Junk
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imapsieve_mailbox2_causes = COPY
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imapsieve_mailbox2_before = file:${state-directory}/imap_sieve/report-ham.sieve
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sieve_pipe_bin_dir = ${pipe-bin}/pipe/bin
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sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment
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}
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recipient_delimiter = +
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lmtp_save_to_detail_mailbox = yes
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lda_mailbox_autosubscribe = yes
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lda_mailbox_autocreate = yes
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'';
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};
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systemd.services.dovecot2.preStart = ''
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mkdir -p '${state-directory}'
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chown ${dovecot-user}:${cfg.mail-group} '${state-directory}'
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rm -rf '${state-directory}/imap_sieve'
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mkdir '${state-directory}/imap_sieve'
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cp -p "${./dovecot/imap_sieve}"/*.sieve '${state-directory}/imap_sieve/'
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for k in "${state-directory}/imap_sieve"/*.sieve ; do
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${pkgs.dovecot_pigeonhole}/bin/sievec "$k"
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done
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chown -R '${dovecot-user}:${cfg.mail-group}' '${state-directory}/imap_sieve'
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chown '${cfg.mail-user}:${cfg.mail-group}' ${cfg.mail-directory}
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chmod g+w ${cfg.mail-directory}
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'';
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};
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}
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