modules/private/mail/dovecot.nix

   1 { lib, pkgs, config, myconfig,  ... }:
   2 let
   3   sieve_bin = pkgs.runCommand "sieve_bin" {
   4     buildInputs = [ pkgs.makeWrapper ];
   5   } ''
   6     cp -a ${./sieve_bin} $out
   7     chmod -R u+w $out
   8     patchShebangs $out
   9     for i in $out/*; do
  10       wrapProgram "$i" --prefix PATH : ${lib.makeBinPath [ pkgs.coreutils ]}
  11     done
  12     '';
  13 in
  14 {
  15   config.secrets.keys = [
  16     {
  17       dest = "dovecot/ldap";
  18       user = config.services.dovecot2.user;
  19       group = config.services.dovecot2.group;
  20       permissions = "0400";
  21       text = ''
  22         hosts = ${myconfig.env.mail.dovecot.ldap.host}
  23         tls = yes
  24
  25         dn = ${myconfig.env.mail.dovecot.ldap.dn}
  26         dnpass = ${myconfig.env.mail.dovecot.ldap.password}
  27
  28         auth_bind = yes
  29
  30         ldap_version = 3
  31
  32         base = ${myconfig.env.mail.dovecot.ldap.base}
  33         scope = subtree
  34
  35         user_filter = ${myconfig.env.mail.dovecot.ldap.filter}
  36         pass_filter = ${myconfig.env.mail.dovecot.ldap.filter}
  37
  38         user_attrs = ${myconfig.env.mail.dovecot.ldap.user_attrs}
  39         pass_attrs = ${myconfig.env.mail.dovecot.ldap.pass_attrs}
  40         '';
  41     }
  42   ];
  43
  44   config.users.users.vhost = {
  45     group = "vhost";
  46     uid = config.ids.uids.vhost;
  47   };
  48   config.users.groups.vhost.gid = config.ids.gids.vhost;
  49
  50   # https://blog.zeninc.net/index.php?post/2018/04/01/Un-annuaire-pour-les-gouverner-tous.......
  51   config.services.dovecot2 = {
  52     enable = true;
  53     enablePAM = false;
  54     enablePop3 = true;
  55     enableImap = true;
  56     enableLmtp = true;
  57     protocols = [ "sieve" ];
  58     modules = [
  59       pkgs.dovecot_pigeonhole
  60       pkgs.dovecot_fts-xapian
  61     ];
  62     mailUser = "vhost";
  63     mailGroup = "vhost";
  64     createMailUser = false;
  65     mailboxes = [
  66       { name = "Trash";  auto = "subscribe"; specialUse = "Trash"; }
  67       { name = "Junk";   auto = "subscribe"; specialUse = "Junk"; }
  68       { name = "Sent";   auto = "subscribe"; specialUse = "Sent"; }
  69       { name = "Drafts"; auto = "subscribe"; specialUse = "Drafts"; }
  70     ];
  71     mailLocation = "mbox:~/Mail:INBOX=~/Mail/Inbox:INDEX=~/.imap";
  72     sslServerCert = "/var/lib/acme/mail/fullchain.pem";
  73     sslServerKey = "/var/lib/acme/mail/key.pem";
  74     sslCACert = "/var/lib/acme/mail/fullchain.pem";
  75     extraConfig = builtins.concatStringsSep "\n" [
  76       ''
  77         postmaster_address = postmaster@immae.eu
  78         mail_attribute_dict = file:%h/dovecot-attributes
  79         imap_idle_notify_interval = 20 mins
  80         namespace inbox {
  81           type = private
  82           separator = /
  83           inbox = yes
  84           list = yes
  85         }
  86       ''
  87
  88       # Full text search
  89       ''
  90         # needs to be bigger than any mailbox size
  91         default_vsz_limit = 2GB
  92         mail_plugins = $mail_plugins fts fts_xapian
  93         plugin {
  94           plugin = fts fts_xapian
  95           fts = xapian
  96           fts_xapian = partial=2 full=20
  97           fts_autoindex = yes
  98           fts_autoindex_exclude = \Junk
  99           fts_autoindex_exclude2 = \Trash
 100           fts_autoindex_exclude3 = Virtual/*
 101         }
 102       ''
 103
 104       # Antispam
 105       # https://docs.iredmail.org/dovecot.imapsieve.html
 106       ''
 107       # imap_sieve plugin added below
 108
 109       plugin {
 110           sieve_plugins = sieve_imapsieve sieve_extprograms
 111           imapsieve_url = sieve://127.0.0.1:4190
 112
 113           # From elsewhere to Junk folder
 114           imapsieve_mailbox1_name = Junk
 115           imapsieve_mailbox1_causes = COPY APPEND
 116           imapsieve_mailbox1_before = file:${./sieve_scripts}/report_spam.sieve;bindir=/var/lib/vhost/.imapsieve_bin
 117
 118           # From Junk folder to elsewhere
 119           imapsieve_mailbox2_name = *
 120           imapsieve_mailbox2_from = Junk
 121           imapsieve_mailbox2_causes = COPY
 122           imapsieve_mailbox2_before = file:${./sieve_scripts}/report_ham.sieve;bindir=/var/lib/vhost/.imapsieve_bin
 123
 124           sieve_pipe_bin_dir = ${sieve_bin}
 125
 126           sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment
 127       }
 128       ''
 129       # Services to listen
 130       ''
 131       service imap-login {
 132         inet_listener imap {
 133         }
 134         inet_listener imaps {
 135         }
 136       }
 137       service pop3-login {
 138         inet_listener pop3 {
 139         }
 140         inet_listener pop3s {
 141         }
 142       }
 143       service imap {
 144       }
 145       service pop3 {
 146       }
 147       service auth {
 148         unix_listener auth-userdb {
 149         }
 150         unix_listener ${config.services.postfix.config.queue_directory}/private/auth {
 151           mode = 0666
 152         }
 153       }
 154       service auth-worker {
 155       }
 156       service dict {
 157         unix_listener dict {
 158         }
 159       }
 160       service stats {
 161         unix_listener stats-reader {
 162           user = vhost
 163           group = vhost
 164           mode = 0660
 165         }
 166         unix_listener stats-writer {
 167           user = vhost
 168           group = vhost
 169           mode = 0660
 170         }
 171       }
 172       ''
 173
 174       # Authentification
 175       ''
 176       first_valid_uid = ${toString config.ids.uids.vhost}
 177       disable_plaintext_auth = yes
 178       passdb {
 179         driver = ldap
 180         args = ${config.secrets.fullPaths."dovecot/ldap"}
 181       }
 182       userdb {
 183         driver = static
 184         args = user=%u uid=vhost gid=vhost home=/var/lib/vhost/%d/%n/ mail=mbox:~/Mail:INBOX=~/Mail/Inbox:INDEX=~/.imap
 185       }
 186       ''
 187
 188       # Zlib
 189       ''
 190       mail_plugins = $mail_plugins zlib
 191       plugin {
 192         zlib_save_level = 6
 193         zlib_save = gz
 194       }
 195       ''
 196
 197       # Sieve
 198       ''
 199       plugin {
 200         sieve = file:~/sieve;bindir=~/.sieve-bin;active=~/.dovecot.sieve
 201       }
 202       service managesieve-login {
 203       }
 204       service managesieve {
 205       }
 206       ''
 207
 208       # Virtual mailboxes
 209       ''
 210       mail_plugins = $mail_plugins virtual
 211       namespace Virtual {
 212         prefix = Virtual/
 213         location = virtual:~/Virtual
 214       }
 215       ''
 216
 217       # Protocol specific configuration
 218       # Needs to come last if there are mail_plugins entries
 219       ''
 220       protocol imap {
 221         mail_plugins = $mail_plugins imap_sieve
 222       }
 223       protocol lda {
 224         mail_plugins = $mail_plugins sieve
 225       }
 226       ''
 227     ];
 228   };
 229   config.networking.firewall.allowedTCPPorts = [ 110 143 993 995 4190 ];
 230   config.system.activationScripts.dovecot = {
 231     deps = [ "users" ];
 232     text  =''
 233       install -m 0755 -o vhost -g vhost -d /var/lib/vhost
 234       '';
 235   };
 236
 237   config.security.acme.certs."mail" = {
 238     postRun = ''
 239       systemctl restart dovecot2.service
 240     '';
 241     extraDomains = {
 242       "imap.immae.eu" = null;
 243       "pop3.immae.eu" = null;
 244     };
 245   };
 246 }
 247