machines/mermet/dovecot.nix

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