servers/mermet/dovecot.nix

   1 { pkgs, lib, config, system, ... }:
   2 let
   3   inherit (builtins) toString toFile readFile;
   4   inherit (builtins.extraBuiltins) pass;
   5   inherit (lib) types;
   6   inherit (pkgs.lib) loadFile unlines unlinesAttrs unlinesValues unwords;
   7   inherit (config) networking;
   8   inherit (config.services) dovecot2 postfix openldap;
   9
  10   # NOTE: nixpkgs' dovecot2.stateDir is currently not exported
  11   stateDir = "/var/lib/dovecot";
  12
  13   sieve_pipe_bin_dir = pkgs.buildEnv {
  14     name = "sieve_pipe_bin_dir";
  15     pathsToLink = [ "/bin" ];
  16     paths = [
  17       learn-spam
  18       learn-ham
  19     ];
  20   };
  21   learn-spam = pkgs.writeShellScriptBin "learn-spam.sh" ''
  22     exec ${pkgs.rspamd}/bin/rspamc -h /run/rspamd/learner.sock learn_spam
  23   '';
  24   learn-ham = pkgs.writeShellScriptBin "learn-ham.sh" ''
  25     exec ${pkgs.rspamd}/bin/rspamc -h /run/rspamd/learner.sock learn_ham
  26   '';
  27
  28   dovecot-virtual = pkgs.buildEnv {
  29     name = "dovecot-virtual";
  30     pathsToLink = [ "/" ];
  31     paths = [
  32       dovecot-virtual-all
  33       dovecot-virtual-recents
  34     ];
  35   };
  36   dovecot-virtual-all = pkgs.writeTextFile {
  37     name = "dovecot-virtual-all";
  38     destination = "/All/dovecot-virtual";
  39     text = ''
  40       *
  41         all
  42     '';
  43   };
  44   dovecot-virtual-recents = pkgs.writeTextFile {
  45     name = "dovecot-virtual-recents";
  46     destination = "/Recents/dovecot-virtual";
  47     text = ''
  48       *
  49         all younger 172800
  50     '';
  51   };
  52   dovecot-virtual-pop3 = pkgs.writeTextFile {
  53     name = "dovecot-virtual-pop3";
  54     destination = "/pop3/INBOX/dovecot-virtual";
  55     text = ''
  56       All
  57       All+*
  58         all
  59     '';
  60   };
  61 in
  62 {
  63 imports = [
  64   dovecot/sourcephile.fr.nix
  65   dovecot/autogeree.net.nix
  66 ];
  67 users.groups.acme.members = [ dovecot2.user ];
  68 systemd.services.dovecot2 = {
  69   after = [
  70     "postfix.service"
  71     "openldap.service"
  72   ];
  73   /*
  74   preStart = ''
  75     # SEE: http://wiki2.dovecot.org/SharedMailboxes/Permissions
  76     install -D -d -m 0771 \
  77      -o "${dovecot2.user}" \
  78      -g "${dovecot2.group}" \
  79      ${stateDir}/mail
  80   '';
  81   */
  82 };
  83 #users.users."${dovecot2.mailUser}".isSystemUser = true; # Fix nixpkgs
  84 services.dovecot2 = {
  85   enable = true;
  86   modules = [
  87     pkgs.dovecot_pigeonhole
  88     pkgs.dovecot_fts_xapian
  89   ];
  90   enablePAM = false;
  91   enableImap = true;
  92   enableLmtp = true;
  93   enablePop3 = false;
  94   protocols = [ "sieve" ];
  95   # If needed, may be overrided by userdb_mail= in passdb, or mail= in userdb
  96   # Here INDEX and CONTROL are separated,
  97   # it's not useful since there is no quota at the filesystem level
  98   # it's just to let this possibility later on.
  99   mailLocation = "sdbox:${stateDir}/home/%d/%n/mail:UTF-8:CONTROL=${stateDir}/control/%d/%n:INDEX=${stateDir}/index/%d/%n";
 100   createMailUser = false;
 101   mailUser = "";
 102   mailGroup = "";
 103   sslServerCert = null;
 104   sieveScripts = {
 105     global = dovecot/sieve/global;
 106   };
 107   extraConfig = ''
 108     auth_verbose = no
 109     auth_debug = no
 110     mail_debug = no
 111     verbose_ssl = no
 112     log_timestamp = "%Y-%m-%d %H:%M:%S "
 113
 114     ssl = required
 115     ssl_dh = <${../../../sec/openssl/dh.pem}
 116     ssl_cipher_list = HIGH:!LOW:!SSLv2:!EXP:!aNULL
 117     ssl_prefer_server_ciphers = yes
 118     ssl_cert = </var/lib/acme/${networking.domain}/fullchain.pem
 119     ssl_key = </var/lib/acme/${networking.domain}/key.pem
 120     #ssl_ca = <''${caPath}
 121     #ssl_verify_client_cert = yes
 122
 123     listen = *
 124     # If needed, may be overrided by userdb_mail
 125     mail_home = ${stateDir}/home/%d/%n
 126     # Read multiple mails in parallel, improves performance
 127     mail_prefetch_count = 20
 128     # Default VSZ (virtual memory size) limit for service processes. This is mainly
 129     # intended to catch and kill processes that leak memory before they eat up everything.
 130     # Increased for fts_xapian.
 131     default_vsz_limit = 1G
 132
 133     # DOC: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/
 134     # DOC: https://ldapwiki.com/wiki/DIGEST-MD5
 135     # The misunderstanding is the notion "password sent over the network in plain-text" is not secure,
 136     # when in fact, storing the password in the directory server using a Salted SHA-2 hash
 137     # and transmitting the clear text password over a secure connection
 138     # is more secure than having the directory server store the password in clear text
 139     # or in a reversible encryption scheme.
 140     # Therefore, SASL with DIGEST-MD5 (or CRAM-MD5) should be avoided.
 141     # Use doveadm pw -s SSHA
 142     # or doveadm pw -s PBKDF2 -r 10000
 143     # or slappasswd -o module-load=pw-pbkdf2 -h "{PBKDF2-SHA256}"
 144     auth_mechanisms = plain login
 145     auth_username_format = %Ln
 146     service auth {
 147       user = ${dovecot2.user}
 148       # auth_socket_path points to this userdb socket by default. It's typically
 149       # used by dovecot-lda, doveadm, possibly imap process, etc.
 150       # Users that have access to this socket are able to get a list
 151       # of all usernames and get results of everyone's userdb lookups.
 152       unix_listener auth-userdb {
 153         user  = ${dovecot2.user}
 154         group = ${dovecot2.group}
 155         mode  = 0660
 156       }
 157       unix_listener /var/lib/postfix/queue/private/auth {
 158         user  = ${postfix.user}
 159         group = ${postfix.group}
 160         mode  = 0660
 161       }
 162     }
 163     service auth-worker {
 164       user = ${dovecot2.user}
 165     }
 166     auth_cache_verify_password_with_worker = yes
 167     # SEE: http://wiki2.dovecot.org/Quota/FS
 168     # NOTE: postfix does not supply a client cert.
 169     auth_ssl_require_client_cert = no
 170     #auth_ssl_username_from_cert = yes
 171     # NOTE: lowercase the username, help with LDAP?
 172     auth_username_format = %Lu
 173     # NOTE: sync with LDAP's data.
 174     first_valid_uid = 1000
 175     disable_plaintext_auth = yes
 176
 177     userdb {
 178       driver = ldap
 179       # A different path than passdb's args enables non-blocking LDAP requests
 180       args = ${pkgs.symlinkJoin {name="ldap"; paths=[./dovecot];}}/ldap.conf
 181       default_fields =
 182       override_fields =
 183     }
 184
 185     # No dirty syncs for maildir: locations which may be used directly by neomutt
 186     maildir_very_dirty_syncs = no
 187     namespace Inbox {
 188       type      = private
 189       inbox     = yes
 190       hidden    = no
 191       list      = yes
 192       prefix    =
 193       separator = +
 194     }
 195     namespace Shared {
 196       type = shared
 197       #list = children
 198       # NOTE: always listed in the LIST command.
 199       list = yes
 200       # NOTE: how to access the other users' mailboxes.
 201       # NOTE: %var expands to the logged in user's variable, while
 202       #       %%var expands to the other users' variables.
 203       # NOTE: INDEX and CONTROL are shared, INDEXPVT is not.
 204       location = sdbox:${stateDir}/home/%%d/%%n/${stateDir}/mail:UTF-8:CONTROL=${stateDir}/control/%%d/%%n/shared:INDEX=${stateDir}/index/%%d/%%n/shared:INDEXPVT=${stateDir}/index/%d/%n/shared/%%n
 205       prefix = Partages+%%n+
 206       separator = +
 207       subscriptions = yes
 208     }
 209     mail_plugins = $mail_plugins virtual
 210     namespace Virtual {
 211       prefix = Virtual+
 212       separator = +
 213       hidden = no
 214       list = yes
 215       subscriptions = no
 216       location = virtual:${dovecot-virtual}:UTF-8:INDEX=${stateDir}/index/%d/%n/virtual
 217     }
 218
 219     mail_plugins = $mail_plugins acl
 220     plugin {
 221       acl = vfile:/etc/dovecot/acl/global
 222       acl_anyone = allow
 223       # NOTE: to let users LIST mailboxes shared by other users,
 224       #       Dovecot needs a shared mailbox dictionary.
 225       # FIXME: %d not working with userdb ldap
 226       acl_shared_dict = file:${stateDir}/acl/%d/acl.db
 227     }
 228
 229     mail_plugins = $mail_plugins fts fts_xapian
 230     plugin {
 231       plugin = fts fts_xapian
 232       fts = xapian
 233       fts_autoindex = yes
 234       fts_autoindex_exclude = \Junk
 235       fts_autoindex_exclude2 = \Trash
 236       fts_enforced = yes
 237       # 2 and 20 are the NGram values for header fields, which means the
 238       # keywords created for fields (To, Cc, ...) are between is 2 and 20 chars long.
 239       # Full words are also added by default.
 240       fts_xapian = partial=2 full=20 verbose=0
 241     }
 242
 243     mail_plugins = $mail_plugins quota
 244     plugin {
 245       quota = maildir:User quota
 246       quota_rule = *:storage=256M
 247       quota_rule2 = Trash:storage=+64M
 248       quota_max_mail_size = 20M
 249       #quota_exceeded_message = </path/to/quota_exceeded_message.txt
 250       quota_warning  = storage=95%% quota-warning 95 %u
 251       quota_warning2 = storage=80%% quota-warning 80 %u
 252       quota_warning3 = -storage=100%% quota-warning below %u
 253     }
 254
 255     protocol lda {
 256       hostname = ${networking.domain}
 257       mail_plugins = $mail_plugins sieve
 258       postmaster_address = postmaster+dovecot+lda@${networking.domain}
 259       syslog_facility = mail
 260     }
 261     lda_mailbox_autocreate = yes
 262     lda_mailbox_autosubscribe = yes
 263
 264     protocol lmtp {
 265       mail_plugins = $mail_plugins sieve
 266       postmaster_address = postmaster+dovecot+lmtp@${networking.domain}
 267     }
 268     service lmtp {
 269       process_min_avail = ${toString config.nix.maxJobs}
 270       unix_listener /var/lib/postfix/queue/private/dovecot-lmtp {
 271         user  = ${postfix.user}
 272         group = ${postfix.group}
 273         mode  = 0600
 274       }
 275     }
 276     plugin {
 277       # Let extension.sieve do the handling of the detail
 278       #lmtp_save_to_detail_mailbox = yes
 279       recipient_delimiter = ${postfix.recipientDelimiter}
 280     }
 281
 282     service imap {
 283       # Most of the memory goes to mmap()ing files.
 284       # You may need to increase this limit if you have huge mailboxes.
 285       #vsz_limit =
 286       process_limit = 1024
 287     }
 288     service imap-login {
 289       #inet_listener imap {
 290       #  address = 127.0.0.1
 291       #  port    = 143
 292       #  ssl     = no
 293       #}
 294       inet_listener imaps {
 295         port = 993
 296         ssl  = yes
 297       }
 298     }
 299     # Store METADATA information within user's HOME directory
 300     mail_attribute_dict = file:%h/dovecot-attributes
 301     # If you have Dovecot v2.2.8+ you may get a significant performance improvement with fetch-headers:
 302     imapc_features = $imapc_features fetch-headers
 303     protocol imap {
 304       #mail_max_userip_connections = 10
 305       mail_plugins = $mail_plugins imap_acl imap_quota imap_sieve virtual
 306       imap_metadata = yes
 307
 308       # DOC: https://wiki.dovecot.org/MailboxSettings
 309       # Due to a bug in Dovecot v2.2.30+ if special-use flags are used,
 310       # SPECIAL-USE needs to be added to post-login CAPABILITY response as RFC 6154 mandates.
 311       imap_capability = +SPECIAL-USE
 312
 313       namespace Inbox {
 314         mailbox "Archives" {
 315           auto = subscribe
 316           special_use = \Archive
 317         }
 318         mailbox "Drafts" {
 319           auto = no
 320           special_use = \Drafts
 321         }
 322         mailbox "Brouillons" {
 323           auto = subscribe
 324           special_use = \Drafts
 325         }
 326         mailbox "Junk" {
 327           auto = no
 328           #autoexpunge = 30d
 329           special_use = \Junk
 330         }
 331         mailbox "Spams" {
 332           auto = no
 333           special_use = \Junk
 334         }
 335         mailbox "Spam" {
 336           auto = no
 337           special_use = \Junk
 338         }
 339         mailbox "Pourriels" {
 340           auto = no
 341           special_use = \Junk
 342         }
 343         mailbox "Pourriel" {
 344           auto = no
 345           special_use = \Junk
 346         }
 347         mailbox "Sent" {
 348           auto = no
 349           special_use = \Sent
 350         }
 351         mailbox "Sent Items" {
 352           auto = no
 353           special_use = \Sent
 354         }
 355         mailbox "Sent Messages" {
 356           auto = no
 357           special_use = \Sent
 358         }
 359         mailbox "Envoyés" {
 360           auto = no
 361           special_use = \Sent
 362         }
 363         mailbox "Trash" {
 364           auto = no
 365           special_use = \Trash
 366           #autoexpunge = 30d
 367         }
 368         mailbox "Corbeille" {
 369           auto = no
 370           special_use = \Trash
 371         }
 372       }
 373       namespace Virtual {
 374         mailbox All {
 375           auto = no
 376           comment = All messages from all mailboxes
 377           # This flag is confused with \Archives by K9-Mail
 378           special_use = \All
 379         }
 380         mailbox Recents {
 381           auto = no
 382           comment = All messages from all mailboxes, arrived in the past 48h
 383         }
 384       }
 385     }
 386     plugin {
 387       sieve_plugins = sieve_imapsieve sieve_extprograms
 388       sieve_global_extensions = +vnd.dovecot.environment +vnd.dovecot.pipe
 389       #sieve_extensions = +editheader
 390       sieve = file:~/sieve;active=~/active.sieve
 391       sieve_default = file:${stateDir}/sieve/global/default.sieve
 392       sieve_default_name = main
 393       sieve_pipe_bin_dir = ${sieve_pipe_bin_dir}/bin
 394       sieve_max_script_size = 1M
 395       sieve_quota_max_scripts = 0
 396       sieve_quota_max_storage = 10M
 397       #sieve_spamtest_max_value = 10
 398       #sieve_spamtest_status_header = X-Spam-Score
 399       #sieve_spamtest_status_type = strlen
 400       #sieve_user_log = ~/sieve.log
 401       # Enables support for user Sieve scripts in IMAP
 402       #imapsieve_url = sieve://mail.${networking.domain}:4190
 403
 404       # When a flag changes, spam or ham according to the \Junk or \NonJunk flags
 405       imapsieve_mailbox1_name = *
 406       imapsieve_mailbox1_causes = FLAG
 407       imapsieve_mailbox1_before = file:${stateDir}/sieve/global/spam-or-ham.sieve
 408
 409       # From elsewhere to Junk folder
 410       imapsieve_mailbox2_name = Pourriel
 411       imapsieve_mailbox2_causes = COPY APPEND
 412       imapsieve_mailbox2_before = file:${stateDir}/sieve/global/report-spam.sieve
 413
 414       # From Junk folder to elsewhere
 415       imapsieve_mailbox3_name = *
 416       imapsieve_mailbox3_from = Pourriel
 417       imapsieve_mailbox3_causes = COPY
 418       imapsieve_mailbox3_before = file:${stateDir}/sieve/global/report-ham.sieve
 419     }
 420     protocol sieve {
 421       # Maximum number of ManageSieve connections allowed for a user from each IP address.
 422       # NOTE: The username is compared case-sensitively.
 423       mail_max_userip_connections = 10
 424
 425       # To fool ManageSieve clients that are focused on CMU's timesieved you can specify
 426       # the IMPLEMENTATION capability that the dovecot reports to clients.
 427       # For example: 'Cyrus timesieved v2.2.13'
 428       managesieve_implementation_string = Dovecot Pigeonhole
 429
 430       # The maximum number of compile errors that are returned to the client upon script
 431       # upload or script verification.
 432       managesieve_max_compile_errors = 5
 433
 434       #mail_max_userip_connections = 10
 435       #managesieve_implementation_string = Dovecot Pigeonhole
 436       managesieve_max_compile_errors = 5
 437       #managesieve_max_line_length = 65536
 438       #managesieve_notify_capability = mailto
 439       #managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave
 440     }
 441     service managesieve-login {
 442       inet_listener sieve {
 443         port = 4190
 444         #ssl  = yes
 445       }
 446
 447       # Number of connections to handle before starting a new process. Typically
 448       # the only useful values are 0 (unlimited) or 1. 1 is more secure, but 0
 449       # is faster. <doc/wiki/LoginProcess.txt>
 450       service_count = 1
 451
 452       # Number of processes to always keep waiting for more connections.
 453       process_min_avail = 0
 454
 455       # If you set service_count=0, you probably need to grow this.
 456       #vsz_limit = 64M
 457     }
 458
 459     service quota-warning {
 460       executable = script ${
 461         pkgs.writeShellScript "quota-warning" ''
 462           set -eu
 463           PERCENT=$1
 464           USER=$2
 465           cat << EOF | ${pkgs.dovecot}/libexec/dovecot/dovecot-lda -d $USER -o
 466           "plugin/quota=maildir:User quota:noenforcing"
 467           From: postmaster@${networking.domain}
 468           Subject: [WARNING] your mailbox is now $PERCENT% full.
 469
 470           Please remove some mails to make room for new ones.
 471           EOF
 472         ''
 473       }
 474       # use some unprivileged user for executing the quota warnings
 475       user = ${dovecot2.user}
 476       unix_listener quota-warning {
 477       }
 478     }
 479
 480     protocol pop3 {
 481       mail_plugins = $mail_plugins virtual
 482       #mail_max_userip_connections = 10
 483       # Virtual namespace for the virtual INBOX.
 484       # Use a global directory for dovecot-virtual files.
 485       #namespace Inbox {
 486       #  hidden    = yes
 487       #  list      = no
 488       #  location  = virtual:''${dovecot-virtual-pop3}/pop3:INDEX=${stateDir}/index/%d/%n/virtual/pop3:LAYOUT=fs
 489       #  prefix    = pop3+
 490       #}
 491       pop3_client_workarounds =
 492       pop3_fast_size_lookups = yes
 493       pop3_lock_session = yes
 494       pop3_no_flag_updates = yes
 495       # Use GUIDs to avoid accidental POP3 UIDL changes instead of IMAP UIDs.
 496       pop3_uidl_format = %g
 497     }
 498     service pop3 {
 499       process_limit = 1024
 500     }
 501     service pop3-login {
 502       inet_listener pop3s {
 503         port = 995
 504         ssl  = yes
 505       }
 506     }
 507   '';
 508 };
 509 }