hosts/mermet/dovecot.nix

   1 { inputs, pkgs, lib, config, system, host, ... }:
   2 let
   3   inherit (builtins) toString toFile readFile;
   4   inherit (lib) types;
   5   inherit (pkgs.lib) loadFile unlines unlinesAttrs unlinesValues unwords;
   6   inherit (config) networking;
   7   inherit (config.services) dovecot2 postfix openldap;
   8
   9   # NOTE: nixpkgs' dovecot2.stateDir is currently not exported
  10   stateDir = "/var/lib/dovecot";
  11
  12   sieve_pipe_bin_dir = pkgs.buildEnv {
  13     name = "sieve_pipe_bin_dir";
  14     pathsToLink = [ "/bin" ];
  15     paths = [
  16       learn-spam
  17       learn-ham
  18     ];
  19   };
  20   learn-spam = pkgs.writeShellScriptBin "learn-spam.sh" ''
  21     exec ${pkgs.rspamd}/bin/rspamc -h /run/rspamd/learner.sock learn_spam
  22   '';
  23   learn-ham = pkgs.writeShellScriptBin "learn-ham.sh" ''
  24     exec ${pkgs.rspamd}/bin/rspamc -h /run/rspamd/learner.sock learn_ham
  25   '';
  26
  27   dovecot-virtual = pkgs.buildEnv {
  28     name = "dovecot-virtual";
  29     pathsToLink = [ "/" ];
  30     paths = [
  31       dovecot-virtual-all
  32       dovecot-virtual-recents
  33     ];
  34   };
  35   dovecot-virtual-all = pkgs.writeTextFile {
  36     name = "dovecot-virtual-all";
  37     destination = "/All/dovecot-virtual";
  38     text = ''
  39       *
  40         all
  41     '';
  42   };
  43   dovecot-virtual-recents = pkgs.writeTextFile {
  44     name = "dovecot-virtual-recents";
  45     destination = "/Recents/dovecot-virtual";
  46     text = ''
  47       *
  48         all younger 172800
  49     '';
  50   };
  51   dovecot-virtual-pop3 = pkgs.writeTextFile {
  52     name = "dovecot-virtual-pop3";
  53     destination = "/pop3/INBOX/dovecot-virtual";
  54     text = ''
  55       All
  56       All+*
  57         all
  58     '';
  59   };
  60 in
  61 {
  62 imports = [
  63   dovecot/sourcephile.fr.nix
  64   dovecot/autogeree.net.nix
  65 ];
  66 users.groups.acme.members = [ dovecot2.user ];
  67 systemd.services.dovecot2 = {
  68   after = [
  69     "postfix.service"
  70     "openldap.service"
  71   ];
  72   /*
  73   preStart = ''
  74     # SEE: http://wiki2.dovecot.org/SharedMailboxes/Permissions
  75     install -D -d -m 0771 \
  76      -o "${dovecot2.user}" \
  77      -g "${dovecot2.group}" \
  78      ${stateDir}/mail
  79   '';
  80   */
  81   serviceConfig = {
  82     #ExecStart = lib.mkForce "${pkgs.utillinux}/bin/setarch x86_64 --addr-no-randomize /bin/sh -c 'LD_PRELOAD=${pkgs.gcc-unwrapped.lib}/lib/libasan.so ${pkgs.dovecot}/sbin/dovecot -F'";
  83     # Dovecot2 does not work with environment.memoryAllocator.provider="scudo"
  84     # https://wiki.dovecot.org/Design/Memory
  85     # Scudo ERROR: CHECK failed at /build/compiler-rt-7.1.0.src/lib/scudo/../sanitizer_common/sanitizer_allocator_primary64.h:
  86     # 644 ((beg)) == ((address_range.MapOrDie(beg, size))) (4398046511092, 4398046507008)
  87     BindReadOnlyPaths = [ "/dev/null:/etc/ld-nix.so.preload" ];
  88   };
  89 };
  90 #users.users."${dovecot2.mailUser}".isSystemUser = true; # Fix nixpkgs
  91 networking.nftables.ruleset = ''
  92   add rule inet filter net2fw tcp dport 993 counter accept comment "IMAPS"
  93   #add rule inet filter net2fw tcp dport 995 counter accept comment "POP3S"
  94   add rule inet filter net2fw tcp dport 4190 counter accept comment "Sieve"
  95 '';
  96 services.dovecot2 = {
  97   enable = true;
  98   modules = [
  99     pkgs.dovecot_pigeonhole
 100     pkgs.dovecot_fts_xapian
 101   ];
 102   enablePAM = false;
 103   enableImap = true;
 104   enableLmtp = true;
 105   enablePop3 = false;
 106   protocols = [ "sieve" ];
 107   # If needed, may be overrided by userdb_mail= in passdb, or mail= in userdb
 108   # Here INDEX and CONTROL are separated,
 109   # it's not useful since there is no quota at the filesystem level
 110   # it's just to let this possibility later on.
 111   mailLocation = "sdbox:${stateDir}/home/%d/%n/mail:UTF-8:CONTROL=${stateDir}/control/%d/%n:INDEX=${stateDir}/index/%d/%n";
 112   createMailUser = false;
 113   mailUser = "";
 114   mailGroup = "";
 115   sslServerCert = null;
 116   sieveScripts = {
 117     global = dovecot/sieve/global;
 118   };
 119   extraConfig = ''
 120     auth_verbose = no
 121     auth_debug = no
 122     mail_debug = no
 123     verbose_ssl = no
 124     log_timestamp = "%Y-%m-%d %H:%M:%S "
 125
 126     ssl = required
 127     ssl_dh = <${inputs.secrets + "/openssl/dh.pem"}
 128     ssl_cipher_list = HIGH:!LOW:!SSLv2:!EXP:!aNULL
 129     ssl_prefer_server_ciphers = yes
 130     ssl_cert = </var/lib/acme/${networking.domain}/fullchain.pem
 131     ssl_key = </var/lib/acme/${networking.domain}/key.pem
 132     #ssl_ca = <''${caPath}
 133     #ssl_verify_client_cert = yes
 134     # FIXME: change to TLSv1.3 when supported by K-9 Mail
 135     ssl_min_protocol = TLSv1.2
 136
 137     listen = *
 138     mail_home = ${stateDir}/home/%d/%n
 139     # Read multiple mails in parallel, improves performance
 140     mail_prefetch_count = 20
 141     # Default VSZ (virtual memory size) limit for service processes. This is mainly
 142     # intended to catch and kill processes that leak memory before they eat up everything.
 143     # Increased for fts_xapian.
 144     default_vsz_limit = 1G
 145
 146     # DOC: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/
 147     # DOC: https://ldapwiki.com/wiki/DIGEST-MD5
 148     # The misunderstanding is the notion "password sent over the network in plain-text" is not secure,
 149     # when in fact, storing the password in the directory server using a Salted SHA-2 hash
 150     # and transmitting the clear text password over a secure connection
 151     # is more secure than having the directory server store the password in clear text
 152     # or in a reversible encryption scheme.
 153     # Therefore, SASL with DIGEST-MD5 (or CRAM-MD5) should be avoided.
 154     # Use doveadm pw -s SSHA
 155     # or doveadm pw -s PBKDF2 -r 10000
 156     # or slappasswd -o module-load=pw-pbkdf2 -h "{PBKDF2-SHA256}"
 157     auth_mechanisms = plain login
 158     auth_username_format = %Ln
 159     service auth {
 160       user = ${dovecot2.user}
 161       # auth_socket_path points to this userdb socket by default. It's typically
 162       # used by dovecot-lda, doveadm, possibly imap process, etc.
 163       # Users that have access to this socket are able to get a list
 164       # of all usernames and get results of everyone's userdb lookups.
 165       unix_listener auth-userdb {
 166         user  = ${dovecot2.user}
 167         group = ${dovecot2.group}
 168         mode  = 0660
 169       }
 170       unix_listener /var/lib/postfix/queue/private/auth {
 171         user  = ${postfix.user}
 172         group = ${postfix.group}
 173         mode  = 0660
 174       }
 175     }
 176     service auth-worker {
 177       user = ${dovecot2.user}
 178     }
 179     auth_cache_verify_password_with_worker = yes
 180     # SEE: http://wiki2.dovecot.org/Quota/FS
 181     # NOTE: postfix does not supply a client cert.
 182     auth_ssl_require_client_cert = no
 183     #auth_ssl_username_from_cert = yes
 184     # NOTE: lowercase the username, help with LDAP?
 185     auth_username_format = %Lu
 186     # NOTE: sync with LDAP's data.
 187     first_valid_uid = 1000
 188     disable_plaintext_auth = yes
 189
 190     userdb {
 191       driver = ldap
 192       # A different path than passdb's args enables non-blocking LDAP requests
 193       args = ${pkgs.symlinkJoin {name="ldap"; paths=[./dovecot];}}/ldap.conf
 194       default_fields =
 195       override_fields =
 196     }
 197
 198     # No dirty syncs for maildir: locations which may be used directly by neomutt
 199     maildir_very_dirty_syncs = no
 200     namespace Inbox {
 201       type      = private
 202       inbox     = yes
 203       hidden    = no
 204       list      = yes
 205       prefix    =
 206       separator = +
 207     }
 208     namespace Shared {
 209       type = shared
 210       #list = children
 211       # NOTE: always listed in the LIST command.
 212       list = yes
 213       # NOTE: how to access the other users' mailboxes.
 214       # NOTE: %var expands to the logged in user's variable, while
 215       #       %%var expands to the other users' variables.
 216       # NOTE: INDEX and CONTROL are shared, INDEXPVT is not.
 217       location = sdbox:${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
 218       prefix = Partages+%%n+
 219       separator = +
 220       subscriptions = yes
 221     }
 222     mail_plugins = $mail_plugins virtual
 223     namespace Virtual {
 224       prefix = Virtual+
 225       separator = +
 226       hidden = no
 227       list = yes
 228       subscriptions = no
 229       location = virtual:${dovecot-virtual}:UTF-8:INDEX=${stateDir}/index/%d/%n/virtual
 230     }
 231
 232     mail_plugins = $mail_plugins acl
 233     plugin {
 234       acl = vfile:/etc/dovecot/acl/global
 235       acl_anyone = allow
 236       # NOTE: to let users LIST mailboxes shared by other users,
 237       #       Dovecot needs a shared mailbox dictionary.
 238       # FIXME: %d not working with userdb ldap
 239       acl_shared_dict = file:${stateDir}/acl/%d/acl.db
 240     }
 241
 242     mail_plugins = $mail_plugins fts fts_xapian
 243     plugin {
 244       # WARNING: doveadm fts rescan is buggy, it will delete the index:
 245       # https://dovecot.org/pipermail/dovecot/2019-February/114709.html
 246       # If need be, use rather: doveadm index -u "*@sourcephile.fr" -q '*'
 247       plugin = fts fts_xapian
 248       fts = xapian
 249       fts_autoindex = yes
 250       fts_autoindex_exclude = \Junk
 251       fts_autoindex_exclude2 = \Trash
 252       fts_enforced = yes
 253       # 2 and 20 are the NGram values for header fields, which means the
 254       # keywords created for fields (To, Cc, ...) are between is 2 and 20 chars long.
 255       # Full words are also added by default.
 256       fts_xapian = partial=2 full=20 attachments=1 verbose=0
 257       fts_languages = en fr
 258       #fts_dovecot_fs = posix:prefix=%h/fts/
 259     }
 260
 261     mail_plugins = $mail_plugins quota
 262     plugin {
 263       quota = maildir:User quota
 264       quota_rule = *:storage=256M
 265       quota_rule2 = Trash:storage=+64M
 266       quota_max_mail_size = 20M
 267       #quota_exceeded_message = </path/to/quota_exceeded_message.txt
 268       quota_warning  = storage=95%% quota-warning 95 %u
 269       quota_warning2 = storage=80%% quota-warning 80 %u
 270       quota_warning3 = -storage=100%% quota-warning below %u
 271     }
 272
 273     protocol lda {
 274       hostname = ${networking.domain}
 275       mail_plugins = $mail_plugins sieve
 276       postmaster_address = postmaster+dovecot+lda@${networking.domain}
 277       syslog_facility = mail
 278     }
 279     lda_mailbox_autocreate = yes
 280     lda_mailbox_autosubscribe = yes
 281
 282     protocol lmtp {
 283       mail_plugins = $mail_plugins sieve
 284       postmaster_address = postmaster+dovecot+lmtp@${networking.domain}
 285     }
 286     service lmtp {
 287       process_min_avail = ${toString host.CPUs}
 288       unix_listener /var/lib/postfix/queue/private/dovecot-lmtp {
 289         user  = ${postfix.user}
 290         group = ${postfix.group}
 291         mode  = 0600
 292       }
 293     }
 294     plugin {
 295       # Let extension.sieve do the handling of the detail
 296       #lmtp_save_to_detail_mailbox = yes
 297       recipient_delimiter = ${postfix.recipientDelimiter}
 298     }
 299
 300     service imap {
 301       # Most of the memory goes to mmap()ing files.
 302       # You may need to increase this limit if you have huge mailboxes.
 303       #vsz_limit =
 304       process_limit = 1024
 305     }
 306     service imap-login {
 307       #inet_listener imap {
 308       #  address = 127.0.0.1
 309       #  port    = 143
 310       #  ssl     = no
 311       #}
 312       inet_listener imaps {
 313         port = 993
 314         ssl  = yes
 315       }
 316     }
 317     # Store METADATA information within user's HOME directory
 318     mail_attribute_dict = file:%h/dovecot-attributes
 319     # If you have Dovecot v2.2.8+ you may get a significant performance improvement with fetch-headers:
 320     imapc_features = $imapc_features fetch-headers
 321     protocol imap {
 322       #mail_max_userip_connections = 10
 323       mail_plugins = $mail_plugins imap_acl imap_quota imap_sieve virtual
 324       imap_metadata = yes
 325
 326       # DOC: https://wiki.dovecot.org/MailboxSettings
 327       # Due to a bug in Dovecot v2.2.30+ if special-use flags are used,
 328       # SPECIAL-USE needs to be added to post-login CAPABILITY response as RFC 6154 mandates.
 329       imap_capability = +SPECIAL-USE
 330
 331       namespace Inbox {
 332         mailbox "Archives" {
 333           auto = subscribe
 334           special_use = \Archive
 335         }
 336         mailbox "Drafts" {
 337           auto = no
 338           special_use = \Drafts
 339         }
 340         mailbox "Brouillons" {
 341           auto = subscribe
 342           special_use = \Drafts
 343         }
 344         mailbox "Junk" {
 345           auto = no
 346           #autoexpunge = 30d
 347           special_use = \Junk
 348         }
 349         mailbox "Spams" {
 350           auto = no
 351           special_use = \Junk
 352         }
 353         mailbox "Spam" {
 354           auto = no
 355           special_use = \Junk
 356         }
 357         mailbox "Pourriels" {
 358           auto = no
 359           special_use = \Junk
 360         }
 361         mailbox "Pourriel" {
 362           auto = no
 363           special_use = \Junk
 364         }
 365         mailbox "Sent" {
 366           auto = no
 367           special_use = \Sent
 368         }
 369         mailbox "Sent Items" {
 370           auto = no
 371           special_use = \Sent
 372         }
 373         mailbox "Sent Messages" {
 374           auto = no
 375           special_use = \Sent
 376         }
 377         mailbox "Envoyés" {
 378           auto = no
 379           special_use = \Sent
 380         }
 381         mailbox "Trash" {
 382           auto = no
 383           special_use = \Trash
 384           #autoexpunge = 30d
 385         }
 386         mailbox "Corbeille" {
 387           auto = no
 388           special_use = \Trash
 389         }
 390       }
 391       namespace Virtual {
 392         mailbox All {
 393           auto = no
 394           comment = All messages from all mailboxes
 395           # This flag is confused with \Archives by K9-Mail
 396           special_use = \All
 397         }
 398         mailbox Recents {
 399           auto = no
 400           comment = All messages from all mailboxes, arrived in the past 48h
 401         }
 402       }
 403     }
 404     plugin {
 405       sieve_plugins = sieve_imapsieve sieve_extprograms
 406       sieve_global_extensions = +vnd.dovecot.environment +vnd.dovecot.pipe
 407       #sieve_extensions = +editheader
 408       sieve = file:~/sieve;active=~/active.sieve
 409       sieve_default = file:${stateDir}/sieve/global/default.sieve
 410       sieve_default_name = main
 411       sieve_pipe_bin_dir = ${sieve_pipe_bin_dir}/bin
 412       sieve_max_script_size = 1M
 413       sieve_quota_max_scripts = 0
 414       sieve_quota_max_storage = 10M
 415       #sieve_spamtest_max_value = 10
 416       #sieve_spamtest_status_header = X-Spam-Score
 417       #sieve_spamtest_status_type = strlen
 418       #sieve_user_log = ~/sieve.log
 419       # Enables support for user Sieve scripts in IMAP
 420       #imapsieve_url = sieve://mail.${networking.domain}:4190
 421
 422       # When a flag changes, spam or ham according to the \Junk or \NonJunk flags
 423       imapsieve_mailbox1_name = *
 424       imapsieve_mailbox1_causes = FLAG
 425       imapsieve_mailbox1_before = file:${stateDir}/sieve/global/spam-or-ham.sieve
 426
 427       # From elsewhere to Junk folder
 428       imapsieve_mailbox2_name = Pourriel
 429       imapsieve_mailbox2_causes = COPY APPEND
 430       imapsieve_mailbox2_before = file:${stateDir}/sieve/global/report-spam.sieve
 431
 432       # From Junk folder to elsewhere
 433       imapsieve_mailbox3_name = *
 434       imapsieve_mailbox3_from = Pourriel
 435       imapsieve_mailbox3_causes = COPY
 436       imapsieve_mailbox3_before = file:${stateDir}/sieve/global/report-ham.sieve
 437     }
 438     protocol sieve {
 439       # Maximum number of ManageSieve connections allowed for a user from each IP address.
 440       # NOTE: The username is compared case-sensitively.
 441       mail_max_userip_connections = 10
 442
 443       # To fool ManageSieve clients that are focused on CMU's timesieved you can specify
 444       # the IMPLEMENTATION capability that the dovecot reports to clients.
 445       # For example: 'Cyrus timesieved v2.2.13'
 446       managesieve_implementation_string = Dovecot Pigeonhole
 447
 448       # The maximum number of compile errors that are returned to the client upon script
 449       # upload or script verification.
 450       managesieve_max_compile_errors = 5
 451
 452       #mail_max_userip_connections = 10
 453       #managesieve_implementation_string = Dovecot Pigeonhole
 454       managesieve_max_compile_errors = 5
 455       #managesieve_max_line_length = 65536
 456       #managesieve_notify_capability = mailto
 457       #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
 458     }
 459     service managesieve-login {
 460       inet_listener sieve {
 461         port = 4190
 462         #ssl  = yes
 463       }
 464
 465       # Number of connections to handle before starting a new process. Typically
 466       # the only useful values are 0 (unlimited) or 1. 1 is more secure, but 0
 467       # is faster. <doc/wiki/LoginProcess.txt>
 468       service_count = 1
 469
 470       # Number of processes to always keep waiting for more connections.
 471       process_min_avail = 0
 472
 473       # If you set service_count=0, you probably need to grow this.
 474       #vsz_limit = 64M
 475     }
 476
 477     service quota-warning {
 478       executable = script ${
 479         pkgs.writeShellScript "quota-warning" ''
 480           set -eu
 481           PERCENT=$1
 482           USER=$2
 483           cat << EOF | ${pkgs.dovecot}/libexec/dovecot/dovecot-lda -d $USER -o
 484           "plugin/quota=maildir:User quota:noenforcing"
 485           From: postmaster@${networking.domain}
 486           Subject: [WARNING] your mailbox is now $PERCENT% full.
 487
 488           Please remove some mails to make room for new ones.
 489           EOF
 490         ''
 491       }
 492       # use some unprivileged user for executing the quota warnings
 493       user = ${dovecot2.user}
 494       unix_listener quota-warning {
 495       }
 496     }
 497
 498     protocol pop3 {
 499       mail_plugins = $mail_plugins virtual
 500       #mail_max_userip_connections = 10
 501       # Virtual namespace for the virtual INBOX.
 502       # Use a global directory for dovecot-virtual files.
 503       #namespace Inbox {
 504       #  hidden    = yes
 505       #  list      = no
 506       #  location  = virtual:''${dovecot-virtual-pop3}/pop3:INDEX=${stateDir}/index/%d/%n/virtual/pop3:LAYOUT=fs
 507       #  prefix    = pop3+
 508       #}
 509       pop3_client_workarounds =
 510       pop3_fast_size_lookups = yes
 511       pop3_lock_session = yes
 512       pop3_no_flag_updates = yes
 513       # Use GUIDs to avoid accidental POP3 UIDL changes instead of IMAP UIDs.
 514       pop3_uidl_format = %g
 515     }
 516     service pop3 {
 517       process_limit = 1024
 518     }
 519     service pop3-login {
 520       inet_listener pop3s {
 521         port = 995
 522         ssl  = yes
 523       }
 524     }
 525   '';
 526 };
 527 }