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   preStart = ''
  82     ln -fns -t ${stateDir}/virtual/ \
  83       ${dovecot-virtual-all}/All \
  84       ${dovecot-virtual-recents}/Recents
  85   '';
  86   serviceConfig = {
  87     #ExecStart = lib.mkForce "${pkgs.utillinux}/bin/setarch x86_64 --addr-no-randomize /bin/sh -c 'LD_PRELOAD=${pkgs.gcc-unwrapped.lib}/lib/libasan.so ${pkgs.dovecot}/sbin/dovecot -F'";
  88     # Dovecot2 does not work with environment.memoryAllocator.provider="scudo"
  89     # https://wiki.dovecot.org/Design/Memory
  90     # Scudo ERROR: CHECK failed at /build/compiler-rt-7.1.0.src/lib/scudo/../sanitizer_common/sanitizer_allocator_primary64.h:
  91     # 644 ((beg)) == ((address_range.MapOrDie(beg, size))) (4398046511092, 4398046507008)
  92     BindReadOnlyPaths = [ "/dev/null:/etc/ld-nix.so.preload" ];
  93     StateDirectory = ["dovecot/virtual"];
  94   };
  95 };
  96 #users.users."${dovecot2.mailUser}".isSystemUser = true; # Fix nixpkgs
  97 networking.nftables.ruleset = ''
  98   add rule inet filter net2fw tcp dport 993 counter accept comment "IMAPS"
  99   #add rule inet filter net2fw tcp dport 995 counter accept comment "POP3S"
 100   add rule inet filter net2fw tcp dport 4190 counter accept comment "Sieve"
 101 '';
 102 fileSystems."/var/lib/dovecot" = {
 103   device = "rpool/var/mail";
 104   fsType = "zfs";
 105 };
 106 services.sanoid.datasets."rpool/var/mail" = {
 107   use_template = [ "snap" ];
 108   hourly = 12;
 109   daily = 7;
 110 };
 111 services.dovecot2 = {
 112   enable = true;
 113   modules = [
 114     pkgs.dovecot_pigeonhole
 115     pkgs.dovecot_fts_xapian
 116   ];
 117   enablePAM = false;
 118   enableImap = true;
 119   enableLmtp = true;
 120   enablePop3 = false;
 121   protocols = [ "sieve" ];
 122   # If needed, may be overrided by userdb_mail= in passdb, or mail= in userdb
 123   # Here INDEX and CONTROL are separated,
 124   # it's not useful since there is no quota at the filesystem level
 125   # it's just to let this possibility later on.
 126   mailLocation = "sdbox:${stateDir}/home/%d/%n/mail:UTF-8:CONTROL=${stateDir}/control/%d/%n:INDEX=${stateDir}/index/%d/%n";
 127   createMailUser = false;
 128   mailUser = "";
 129   mailGroup = "";
 130   sslServerCert = null;
 131   sieveScripts = {
 132     global = dovecot/sieve/global;
 133   };
 134   extraConfig = ''
 135     auth_verbose = no
 136     auth_debug = no
 137     mail_debug = no
 138     verbose_ssl = no
 139     log_timestamp = "%Y-%m-%d %H:%M:%S "
 140
 141     ssl = required
 142     ssl_dh = <${inputs.secrets + "/openssl/dh.pem"}
 143     ssl_cipher_list = HIGH:!LOW:!SSLv2:!EXP:!aNULL
 144     ssl_prefer_server_ciphers = yes
 145     ssl_cert = </var/lib/acme/${networking.domain}/fullchain.pem
 146     ssl_key = </var/lib/acme/${networking.domain}/key.pem
 147     #ssl_ca = <''${caPath}
 148     #ssl_verify_client_cert = yes
 149     # FIXME: change to TLSv1.3 when supported by K-9 Mail
 150     ssl_min_protocol = TLSv1.2
 151
 152     listen = *
 153     mail_home = ${stateDir}/home/%d/%n
 154     # Read multiple mails in parallel, improves performance
 155     mail_prefetch_count = 20
 156     # Default VSZ (virtual memory size) limit for service processes. This is mainly
 157     # intended to catch and kill processes that leak memory before they eat up everything.
 158     # Increased for fts_xapian.
 159     default_vsz_limit = 1G
 160
 161     # DOC: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/
 162     # DOC: https://ldapwiki.com/wiki/DIGEST-MD5
 163     # The misunderstanding is the notion "password sent over the network in plain-text" is not secure,
 164     # when in fact, storing the password in the directory server using a Salted SHA-2 hash
 165     # and transmitting the clear text password over a secure connection
 166     # is more secure than having the directory server store the password in clear text
 167     # or in a reversible encryption scheme.
 168     # Therefore, SASL with DIGEST-MD5 (or CRAM-MD5) should be avoided.
 169     # Use doveadm pw -s SSHA
 170     # or doveadm pw -s PBKDF2 -r 10000
 171     # or slappasswd -o module-load=pw-pbkdf2 -h "{PBKDF2-SHA256}"
 172     auth_mechanisms = plain login
 173     auth_username_format = %Ln
 174     service auth {
 175       user = ${dovecot2.user}
 176       # auth_socket_path points to this userdb socket by default. It's typically
 177       # used by dovecot-lda, doveadm, possibly imap process, etc.
 178       # Users that have access to this socket are able to get a list
 179       # of all usernames and get results of everyone's userdb lookups.
 180       unix_listener auth-userdb {
 181         user  = ${dovecot2.user}
 182         group = ${dovecot2.group}
 183         mode  = 0660
 184       }
 185       unix_listener /var/lib/postfix/queue/private/auth {
 186         user  = ${postfix.user}
 187         group = ${postfix.group}
 188         mode  = 0660
 189       }
 190     }
 191     service auth-worker {
 192       user = ${dovecot2.user}
 193     }
 194     auth_cache_verify_password_with_worker = yes
 195     # SEE: http://wiki2.dovecot.org/Quota/FS
 196     # NOTE: postfix does not supply a client cert.
 197     auth_ssl_require_client_cert = no
 198     #auth_ssl_username_from_cert = yes
 199     # NOTE: lowercase the username, help with LDAP?
 200     auth_username_format = %Lu
 201     # NOTE: sync with LDAP's data.
 202     first_valid_uid = 1000
 203     disable_plaintext_auth = yes
 204
 205     userdb {
 206       driver = ldap
 207       # A different path than passdb's args enables non-blocking LDAP requests
 208       args = ${pkgs.symlinkJoin {name="ldap"; paths=[./dovecot];}}/ldap.conf
 209       default_fields =
 210       override_fields =
 211     }
 212
 213     # No dirty syncs for maildir: locations which may be used directly by neomutt
 214     maildir_very_dirty_syncs = no
 215     namespace Inbox {
 216       type      = private
 217       inbox     = yes
 218       hidden    = no
 219       list      = yes
 220       prefix    =
 221       separator = +
 222     }
 223     namespace Shared {
 224       type = shared
 225       #list = children
 226       # NOTE: always listed in the LIST command.
 227       list = yes
 228       # NOTE: how to access the other users' mailboxes.
 229       # NOTE: %var expands to the logged in user's variable, while
 230       #       %%var expands to the other users' variables.
 231       # NOTE: INDEX and CONTROL are shared, INDEXPVT is not.
 232       location = sdbox:${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
 233       prefix = Partages+%%n+
 234       separator = +
 235       subscriptions = yes
 236     }
 237     mail_plugins = $mail_plugins virtual
 238     namespace Virtual {
 239       prefix = Virtual+
 240       separator = +
 241       hidden = no
 242       list = yes
 243       subscriptions = no
 244       location = virtual:${dovecot-virtual}:UTF-8:INDEX=${stateDir}/index/%d/%n/virtual
 245     }
 246
 247     mail_plugins = $mail_plugins acl
 248     plugin {
 249       acl = vfile:/etc/dovecot/acl/global
 250       acl_anyone = allow
 251       # NOTE: to let users LIST mailboxes shared by other users,
 252       #       Dovecot needs a shared mailbox dictionary.
 253       # FIXME: %d not working with userdb ldap
 254       acl_shared_dict = file:${stateDir}/acl/%d/acl.db
 255     }
 256
 257     mail_plugins = $mail_plugins fts fts_xapian
 258     plugin {
 259       # WARNING: doveadm fts rescan is buggy, it will delete the index:
 260       # https://dovecot.org/pipermail/dovecot/2019-February/114709.html
 261       # If need be, use rather: doveadm index -u "*@sourcephile.fr" -q '*'
 262       plugin = fts fts_xapian
 263       fts = xapian
 264       fts_autoindex = yes
 265       fts_autoindex_exclude = \Junk
 266       fts_autoindex_exclude2 = \Trash
 267       fts_enforced = yes
 268       # 2 and 20 are the NGram values for header fields, which means the
 269       # keywords created for fields (To, Cc, ...) are between is 2 and 20 chars long.
 270       # Full words are also added by default.
 271       fts_xapian = partial=2 full=20 attachments=1 verbose=0
 272       fts_languages = en fr
 273       #fts_dovecot_fs = posix:prefix=%h/fts/
 274     }
 275
 276     mail_plugins = $mail_plugins quota
 277     plugin {
 278       quota = maildir:User quota
 279       quota_rule = *:storage=256M
 280       quota_rule2 = Trash:storage=+64M
 281       quota_max_mail_size = 20M
 282       #quota_exceeded_message = </path/to/quota_exceeded_message.txt
 283       quota_warning  = storage=95%% quota-warning 95 %u
 284       quota_warning2 = storage=80%% quota-warning 80 %u
 285       quota_warning3 = -storage=100%% quota-warning below %u
 286     }
 287
 288     protocol lda {
 289       hostname = ${networking.domain}
 290       mail_plugins = $mail_plugins sieve
 291       postmaster_address = root+dovecot+lda@${networking.domain}
 292       syslog_facility = mail
 293     }
 294     lda_mailbox_autocreate = yes
 295     lda_mailbox_autosubscribe = yes
 296
 297     protocol lmtp {
 298       mail_plugins = $mail_plugins sieve
 299       postmaster_address = root+dovecot+lmtp@${networking.domain}
 300     }
 301     service lmtp {
 302       process_min_avail = ${toString host.CPUs}
 303       unix_listener /var/lib/postfix/queue/private/dovecot-lmtp {
 304         user  = ${postfix.user}
 305         group = ${postfix.group}
 306         mode  = 0600
 307       }
 308     }
 309     plugin {
 310       # Let extension.sieve do the handling of the detail
 311       #lmtp_save_to_detail_mailbox = yes
 312       recipient_delimiter = ${postfix.recipientDelimiter}
 313     }
 314
 315     service imap {
 316       # Most of the memory goes to mmap()ing files.
 317       # You may need to increase this limit if you have huge mailboxes.
 318       #vsz_limit =
 319       process_limit = 1024
 320     }
 321     service imap-login {
 322       #inet_listener imap {
 323       #  address = 127.0.0.1
 324       #  port    = 143
 325       #  ssl     = no
 326       #}
 327       inet_listener imaps {
 328         port = 993
 329         ssl  = yes
 330       }
 331     }
 332     # Store METADATA information within user's HOME directory
 333     mail_attribute_dict = file:%h/dovecot-attributes
 334     # If you have Dovecot v2.2.8+ you may get a significant performance improvement with fetch-headers:
 335     imapc_features = $imapc_features fetch-headers
 336     protocol imap {
 337       #mail_max_userip_connections = 10
 338       mail_plugins = $mail_plugins imap_acl imap_quota imap_sieve virtual
 339       imap_metadata = yes
 340
 341       # DOC: https://wiki.dovecot.org/MailboxSettings
 342       # Due to a bug in Dovecot v2.2.30+ if special-use flags are used,
 343       # SPECIAL-USE needs to be added to post-login CAPABILITY response as RFC 6154 mandates.
 344       imap_capability = +SPECIAL-USE
 345
 346       namespace Inbox {
 347         mailbox "Archives" {
 348           auto = subscribe
 349           special_use = \Archive
 350         }
 351         mailbox "Drafts" {
 352           auto = no
 353           special_use = \Drafts
 354         }
 355         mailbox "Brouillons" {
 356           auto = subscribe
 357           special_use = \Drafts
 358         }
 359         mailbox "Junk" {
 360           auto = no
 361           #autoexpunge = 30d
 362           special_use = \Junk
 363         }
 364         mailbox "Spams" {
 365           auto = no
 366           special_use = \Junk
 367         }
 368         mailbox "Spam" {
 369           auto = no
 370           special_use = \Junk
 371         }
 372         mailbox "Pourriels" {
 373           auto = no
 374           special_use = \Junk
 375         }
 376         mailbox "Pourriel" {
 377           auto = no
 378           special_use = \Junk
 379         }
 380         mailbox "Sent" {
 381           auto = no
 382           special_use = \Sent
 383         }
 384         mailbox "Sent Items" {
 385           auto = no
 386           special_use = \Sent
 387         }
 388         mailbox "Sent Messages" {
 389           auto = no
 390           special_use = \Sent
 391         }
 392         mailbox "Envoyés" {
 393           auto = no
 394           special_use = \Sent
 395         }
 396         mailbox "Trash" {
 397           auto = no
 398           special_use = \Trash
 399           #autoexpunge = 30d
 400         }
 401         mailbox "Corbeille" {
 402           auto = no
 403           special_use = \Trash
 404         }
 405       }
 406       namespace Virtual {
 407         mailbox All {
 408           auto = no
 409           comment = All messages from all mailboxes
 410           # This flag is confused with \Archives by K9-Mail
 411           special_use = \All
 412         }
 413         mailbox Recents {
 414           auto = no
 415           comment = All messages from all mailboxes, arrived in the past 48h
 416         }
 417       }
 418     }
 419     plugin {
 420       sieve_plugins = sieve_imapsieve sieve_extprograms
 421       sieve_global_extensions = +vnd.dovecot.environment +vnd.dovecot.pipe
 422       #sieve_extensions = +editheader
 423       sieve = file:~/sieve;active=~/active.sieve
 424       sieve_default = file:${stateDir}/sieve/global/default.sieve
 425       sieve_default_name = main
 426       sieve_pipe_bin_dir = ${sieve_pipe_bin_dir}/bin
 427       sieve_max_script_size = 1M
 428       sieve_quota_max_scripts = 0
 429       sieve_quota_max_storage = 10M
 430       #sieve_spamtest_max_value = 10
 431       #sieve_spamtest_status_header = X-Spam-Score
 432       #sieve_spamtest_status_type = strlen
 433       #sieve_user_log = ~/sieve.log
 434       # Enables support for user Sieve scripts in IMAP
 435       #imapsieve_url = sieve://mail.${networking.domain}:4190
 436
 437       # When a flag changes, spam or ham according to the \Junk or \NonJunk flags
 438       imapsieve_mailbox1_name = *
 439       imapsieve_mailbox1_causes = FLAG
 440       imapsieve_mailbox1_before = file:${stateDir}/sieve/global/spam-or-ham.sieve
 441
 442       # From elsewhere to Junk folder
 443       imapsieve_mailbox2_name = Pourriel
 444       imapsieve_mailbox2_causes = COPY APPEND
 445       imapsieve_mailbox2_before = file:${stateDir}/sieve/global/report-spam.sieve
 446
 447       # From Junk folder to elsewhere
 448       imapsieve_mailbox3_name = *
 449       imapsieve_mailbox3_from = Pourriel
 450       imapsieve_mailbox3_causes = COPY
 451       imapsieve_mailbox3_before = file:${stateDir}/sieve/global/report-ham.sieve
 452     }
 453     protocol sieve {
 454       # Maximum number of ManageSieve connections allowed for a user from each IP address.
 455       # NOTE: The username is compared case-sensitively.
 456       mail_max_userip_connections = 10
 457
 458       # To fool ManageSieve clients that are focused on CMU's timesieved you can specify
 459       # the IMPLEMENTATION capability that the dovecot reports to clients.
 460       # For example: 'Cyrus timesieved v2.2.13'
 461       managesieve_implementation_string = Dovecot Pigeonhole
 462
 463       # The maximum number of compile errors that are returned to the client upon script
 464       # upload or script verification.
 465       managesieve_max_compile_errors = 5
 466
 467       #mail_max_userip_connections = 10
 468       #managesieve_implementation_string = Dovecot Pigeonhole
 469       managesieve_max_compile_errors = 5
 470       #managesieve_max_line_length = 65536
 471       #managesieve_notify_capability = mailto
 472       #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
 473     }
 474     service managesieve-login {
 475       inet_listener sieve {
 476         port = 4190
 477         #ssl  = yes
 478       }
 479
 480       # Number of connections to handle before starting a new process. Typically
 481       # the only useful values are 0 (unlimited) or 1. 1 is more secure, but 0
 482       # is faster. <doc/wiki/LoginProcess.txt>
 483       service_count = 1
 484
 485       # Number of processes to always keep waiting for more connections.
 486       process_min_avail = 0
 487
 488       # If you set service_count=0, you probably need to grow this.
 489       #vsz_limit = 64M
 490     }
 491
 492     service quota-warning {
 493       executable = script ${
 494         pkgs.writeShellScript "quota-warning" ''
 495           set -eu
 496           PERCENT=$1
 497           USER=$2
 498           cat << EOF | ${pkgs.dovecot}/libexec/dovecot/dovecot-lda -d $USER -o
 499           "plugin/quota=maildir:User quota:noenforcing"
 500           From: root+docevot@${networking.domain}
 501           Subject: [WARNING] your mailbox is now $PERCENT% full.
 502
 503           Please remove some mails to make room for new ones.
 504           EOF
 505         ''
 506       }
 507       # use some unprivileged user for executing the quota warnings
 508       user = ${dovecot2.user}
 509       unix_listener quota-warning {
 510       }
 511     }
 512
 513     protocol pop3 {
 514       mail_plugins = $mail_plugins virtual
 515       #mail_max_userip_connections = 10
 516       # Virtual namespace for the virtual INBOX.
 517       # Use a global directory for dovecot-virtual files.
 518       #namespace Inbox {
 519       #  hidden    = yes
 520       #  list      = no
 521       #  location  = virtual:''${dovecot-virtual-pop3}/pop3:INDEX=${stateDir}/index/%d/%n/virtual/pop3:LAYOUT=fs
 522       #  prefix    = pop3+
 523       #}
 524       pop3_client_workarounds =
 525       pop3_fast_size_lookups = yes
 526       pop3_lock_session = yes
 527       pop3_no_flag_updates = yes
 528       # Use GUIDs to avoid accidental POP3 UIDL changes instead of IMAP UIDs.
 529       pop3_uidl_format = %g
 530     }
 531     service pop3 {
 532       process_limit = 1024
 533     }
 534     service pop3-login {
 535       inet_listener pop3s {
 536         port = 995
 537         ssl  = yes
 538       }
 539     }
 540   '';
 541 };
 542 }