all messages for Guix-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 4db0328962d96bf8a0a120180f3ef871090ce9e3 55710 bytes (raw)
name: gnu/services/mail.scm 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
 
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 Andy Wingo <wingo@igalia.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
;;;
;;; Some of the help text was taken from the default dovecot.conf files.

(define-module (gnu services mail)
  #:use-module (gnu services)
  #:use-module (gnu services base)
  #:use-module (gnu services configuration)
  #:use-module (gnu services shepherd)
  #:use-module (gnu system pam)
  #:use-module (gnu system shadow)
  #:use-module (gnu packages mail)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages tls)
  #:use-module (guix records)
  #:use-module (guix packages)
  #:use-module (guix gexp)
  #:use-module (ice-9 match)
  #:export (dovecot-service
            dovecot-service-type
            dovecot-configuration
            opaque-dovecot-configuration

            dict-configuration
            passdb-configuration
            userdb-configuration
            unix-listener-configuration
            fifo-listener-configuration
            inet-listener-configuration
            service-configuration
            protocol-configuration
            plugin-configuration
            mailbox-configuration
            namespace-configuration))

;;; Commentary:
;;;
;;; This module provides service definitions for the Dovecot POP3 and IMAP
;;; mail server.
;;;
;;; Code:


(define (comma-separated-string-list? val)
  (and (list? val)
       (and-map (lambda (x)
                  (and (string? x) (not (string-index x #\,))))
                val)))
(define (serialize-comma-separated-string-list field-name val)
  (serialize-field field-name (string-join val ",")))

(define (colon-separated-file-name-list? val)
  (and (list? val)
       ;; Trailing slashes not needed and not
       (and-map file-name? val)))
(define (serialize-colon-separated-file-name-list field-name val)
  (serialize-field field-name (string-join val ":")))

(define (non-negative-integer? val)
  (and (exact-integer? val) (not (negative? val))))
(define (serialize-non-negative-integer field-name val)
  (serialize-field field-name val))

(define (hours? val) (non-negative-integer? val))
(define (serialize-hours field-name val)
  (serialize-field field-name (format #f "~a hours" val)))

(define (free-form-fields? val)
  (match val
    (() #t)
    ((((? symbol?) . (? string)) . val) (free-form-fields? val))
    (_ #f)))
(define (serialize-free-form-fields field-name val)
  (for-each (match-lambda ((k . v) (serialize-field k v))) val))

(define (free-form-args? val)
  (match val
    (() #t)
    ((((? symbol?) . (? string)) . val) (free-form-args? val))
    (_ #f)))
(define (serialize-free-form-args field-name val)
  (serialize-field field-name
                   (string-join
                    (map (match-lambda ((k . v) (format #t "~a=~a" k v))) val)
                    " ")))

(define-configuration dict-configuration
  (entries
   (free-form-fields '())
   "A list of key-value pairs that this dict should hold."))

(define (serialize-dict-configuration field-name val)
  (format #t "dict {\n")
  (serialize-configuration val dict-configuration-fields)
  (format #t "}\n"))

(define-configuration passdb-configuration
  (driver
   (string "pam")
   "The driver that the passdb should use.  Valid values include
@samp{pam}, @samp{passwd}, @samp{shadow}, @samp{bsdauth}, and
@samp{static}.")
  (args
   (free-form-args '())
   "A list of key-value args to the passdb driver."))

(define (serialize-passdb-configuration field-name val)
  (format #t "passdb {\n")
  (serialize-configuration val passdb-configuration-fields)
  (format #t "}\n"))
(define (passdb-configuration-list? val)
  (and (list? val) (and-map passdb-configuration? val)))
(define (serialize-passdb-configuration-list field-name val)
  (for-each (lambda (val) (serialize-passdb-configuration field-name val)) val))

(define-configuration userdb-configuration
  (driver
   (string "passwd")
   "The driver that the userdb should use.  Valid values include
@samp{passwd} and @samp{static}.")
  (args
   (free-form-args '())
   "A list of key-value args to the userdb driver.")
  (override-fields
   (free-form-args '())
   "Override fields from passwd."))

(define (serialize-userdb-configuration field-name val)
  (format #t "userdb {\n")
  (serialize-configuration val userdb-configuration-fields)
  (format #t "}\n"))
(define (userdb-configuration-list? val)
  (and (list? val) (and-map userdb-configuration? val)))
(define (serialize-userdb-configuration-list field-name val)
  (for-each (lambda (val) (serialize-userdb-configuration field-name val)) val))

(define-configuration unix-listener-configuration
  (path
   (file-name (configuration-missing-field 'unix-listener 'path))
   "The file name on which to listen.")
  (mode
   (string "0600")
   "The access mode for the socket.")
  (user
   (string "")
   "The user to own the the socket.")
  (group
   (string "")
   "The group to own the socket."))

(define (serialize-unix-listener-configuration field-name val)
  (format #t "unix_listener ~a {\n" (unix-listener-configuration-path val))
  (serialize-configuration val (cdr unix-listener-configuration-fields))
  (format #t "}\n"))

(define-configuration fifo-listener-configuration
  (path
   (file-name (configuration-missing-field 'fifo-listener 'path))
   "The file name on which to listen.")
  (mode
   (string "0600")
   "The access mode for the socket.")
  (user
   (string "")
   "The user to own the the socket.")
  (group
   (string "")
   "The group to own the socket."))

(define (serialize-fifo-listener-configuration field-name val)
  (format #t "fifo_listener ~a {\n" (fifo-listener-configuration-path val))
  (serialize-configuration val (cdr fifo-listener-configuration-fields))
  (format #t "}\n"))

(define-configuration inet-listener-configuration
  (protocol
   (string (configuration-missing-field 'inet-listener 'protocol))
   "The protocol to listen for.")
  (address
   (string "")
   "The address on which to listen, or empty for all addresses.")
  (port
   (non-negative-integer
    (configuration-missing-field 'inet-listener 'port))
   "The port on which to listen.")
  (ssl?
   (boolean #t)
   "Whether to use SSL for this service; @samp{yes}, @samp{no}, or
@samp{required}."))

(define (serialize-inet-listener-configuration field-name val)
  (format #t "inet_listener ~a {\n" (inet-listener-configuration-protocol val))
  (serialize-configuration val (cdr inet-listener-configuration-fields))
  (format #t "}\n"))

(define (listener-configuration? val)
  (or (unix-listener-configuration? val)
      (fifo-listener-configuration? val)
      (inet-listener-configuration? val)))
(define (serialize-listener-configuration field-name val)
  (cond
   ((unix-listener-configuration? val)
    (serialize-unix-listener-configuration field-name val))
   ((fifo-listener-configuration? val)
    (serialize-fifo-listener-configuration field-name val))
   ((inet-listener-configuration? val)
    (serialize-inet-listener-configuration field-name val))
   (else (configuration-field-error field-name val))))
(define (listener-configuration-list? val)
  (and (list? val) (and-map listener-configuration? val)))
(define (serialize-listener-configuration-list field-name val)
  (for-each (lambda (val)
              (serialize-listener-configuration field-name val))
            val))

(define-configuration service-configuration
  (kind
   (string (configuration-missing-field 'service 'kind))
   "The service kind.  Valid values include @code{director},
@code{imap-login}, @code{pop3-login}, @code{lmtp}, @code{imap},
@code{pop3}, @code{auth}, @code{auth-worker}, @code{dict},
@code{tcpwrap}, @code{quota-warning}, or anything else.")
  (listeners
   (listener-configuration-list '())
   "Listeners for the service.  A listener is either an
@code{unix-listener-configuration}, a @code{fifo-listener-configuration}, or
an @code{inet-listener-configuration}.")
  (service-count
   (non-negative-integer 1)
   "Number of connections to handle before starting a new process.
Typically the only useful values are 0 (unlimited) or 1.  1 is more
secure, but 0 is faster.  <doc/wiki/LoginProcess.txt>.")
  (process-min-avail
   (non-negative-integer 0)
   "Number of processes to always keep waiting for more connections.")
  ;; FIXME: Need to be able to take the default for this value from other
  ;; parts of the config.
  (vsz-limit
   (non-negative-integer #e256e6)
   "If you set @samp{service-count 0}, you probably need to grow
this."))

(define (serialize-service-configuration field-name val)
  (format #t "service ~a {\n" (service-configuration-kind val))
  (serialize-configuration val (cdr service-configuration-fields))
  (format #t "}\n"))
(define (service-configuration-list? val)
  (and (list? val) (and-map service-configuration? val)))
(define (serialize-service-configuration-list field-name val)
  (for-each (lambda (val)
              (serialize-service-configuration field-name val))
            val))

(define-configuration protocol-configuration
  (name
   (string (configuration-missing-field 'protocol 'name))
   "The name of the protocol.")
  (auth-socket-path
   (string "/var/run/dovecot/auth-userdb")
   "UNIX socket path to master authentication server to find users.
This is used by imap (for shared users) and lda.")
  (mail-plugins
   (space-separated-string-list '("$mail_plugins"))
   "Space separated list of plugins to load.")
  (mail-max-userip-connections
   (non-negative-integer 10)
   "Maximum number of IMAP connections allowed for a user from each IP
address.  NOTE: The username is compared case-sensitively."))

(define (serialize-protocol-configuration field-name val)
  (format #t "protocol ~a {\n" (protocol-configuration-name val))
  (serialize-configuration val (cdr protocol-configuration-fields))
  (format #t "}\n"))
(define (protocol-configuration-list? val)
  (and (list? val) (and-map protocol-configuration? val)))
(define (serialize-protocol-configuration-list field-name val)
  (serialize-field 'protocols
                   (string-join (map protocol-configuration-name val) " "))
  (for-each (lambda (val)
              (serialize-protocol-configuration field-name val))
            val))

(define-configuration plugin-configuration
  (entries
   (free-form-fields '())
   "A list of key-value pairs that this dict should hold."))

(define (serialize-plugin-configuration field-name val)
  (format #t "plugin {\n")
  (serialize-configuration val plugin-configuration-fields)
  (format #t "}\n"))

(define-configuration mailbox-configuration
  (name
   (string (error "mailbox name is required"))
   "Name for this mailbox.")

  (auto
   (string "no")
   "@samp{create} will automatically create this mailbox.
@samp{subscribe} will both create and subscribe to the mailbox.")

  (special-use
   (space-separated-string-list '())
   "List of IMAP @code{SPECIAL-USE} attributes as specified by RFC 6154.
Valid values are @code{\\All}, @code{\\Archive}, @code{\\Drafts},
@code{\\Flagged}, @code{\\Junk}, @code{\\Sent}, and @code{\\Trash}."))

(define (serialize-mailbox-configuration field-name val)
  (format #t "mailbox \"~a\" {\n" (mailbox-configuration-name val))
  (serialize-configuration val (cdr mailbox-configuration-fields))
  (format #t "}\n"))
(define (mailbox-configuration-list? val)
  (and (list? val) (and-map mailbox-configuration? val)))
(define (serialize-mailbox-configuration-list field-name val)
  (for-each (lambda (val)
              (serialize-mailbox-configuration field-name val))
            val))

(define-configuration namespace-configuration
  (name
   (string (error "namespace name is required"))
   "Name for this namespace.")

  (type
   (string "private")
   "Namespace type: @samp{private}, @samp{shared} or @samp{public}.")

  (separator
   (string "")
   "Hierarchy separator to use. You should use the same separator for
all namespaces or some clients get confused.  @samp{/} is usually a good
one.  The default however depends on the underlying mail storage
format.")

  (prefix
   (string "")
   "Prefix required to access this namespace.  This needs to be
different for all namespaces. For example @samp{Public/}.")

  (location
   (string "")
   "Physical location of the mailbox. This is in same format as
mail_location, which is also the default for it.")

  (inbox?
   (boolean #f)
   "There can be only one INBOX, and this setting defines which
namespace has it.")

  (hidden?
   (boolean #f)
   "If namespace is hidden, it's not advertised to clients via NAMESPACE
extension. You'll most likely also want to set @samp{list? #f}.  This is mostly
useful when converting from another server with different namespaces
which you want to deprecate but still keep working.  For example you can
create hidden namespaces with prefixes @samp{~/mail/}, @samp{~%u/mail/}
and @samp{mail/}.")

  (list?
   (boolean #t)
   "Show the mailboxes under this namespace with LIST command. This
makes the namespace visible for clients that don't support NAMESPACE
extension.  The special @code{children} value lists child mailboxes, but
hides the namespace prefix.")

  (subscriptions?
   (boolean #t)
   "Namespace handles its own subscriptions.  If set to @code{#f}, the
parent namespace handles them.  The empty prefix should always have this
as @code{#t}.)")

  (mailboxes
   (mailbox-configuration-list '())
   "List of predefined mailboxes in this namespace."))

(define (serialize-namespace-configuration field-name val)
  (format #t "namespace ~a {\n" (namespace-configuration-name val))
  (serialize-configuration val (cdr namespace-configuration-fields))
  (format #t "}\n"))
(define (list-of-namespace-configuration? val)
  (and (list? val) (and-map namespace-configuration? val)))
(define (serialize-list-of-namespace-configuration field-name val)
  (for-each (lambda (val)
              (serialize-namespace-configuration field-name val))
            val))

(define-configuration dovecot-configuration
  (dovecot
   (package dovecot)
   "The dovecot package.")

  (listen
   (comma-separated-string-list '("*" "::"))
   "A list of IPs or hosts where to listen in for connections.  @samp{*}
listens in all IPv4 interfaces, @samp{::} listens in all IPv6
interfaces.  If you want to specify non-default ports or anything more
complex, customize the address and port fields of the
@samp{inet-listener} of the specific services you are interested in.")

  (protocols
   (protocol-configuration-list
    (list (protocol-configuration
           (name "imap"))))
   "List of protocols we want to serve.  Available protocols include
@samp{imap}, @samp{pop3}, and @samp{lmtp}.")

  (services
   (service-configuration-list
    (list
     (service-configuration
      (kind "imap-login")
      (listeners
       (list
        (inet-listener-configuration (protocol "imap") (port 143) (ssl? #f))
        (inet-listener-configuration (protocol "imaps") (port 993) (ssl? #t)))))
     (service-configuration
      (kind "pop3-login")
      (listeners
       (list
        (inet-listener-configuration (protocol "pop3") (port 110) (ssl? #f))
        (inet-listener-configuration (protocol "pop3s") (port 995) (ssl? #t)))))
     (service-configuration
      (kind "lmtp")
      (listeners
       (list (unix-listener-configuration (path "lmtp") (mode "0666")))))
     (service-configuration (kind "imap"))
     (service-configuration (kind "pop3"))
     (service-configuration (kind "auth")
      ;; In what could be taken to be a bug, the default value of 1 for
      ;; service-count makes it so that a PAM auth worker can't fork off
      ;; subprocesses for making blocking queries.  The result is that nobody
      ;; can log in -- very secure, but not very useful!  If we simply omit
      ;; the service-count, it will default to the value of
      ;; auth-worker-max-count, which is 30, instead of defaulting to 1, which
      ;; is the default for all other services.  As a hack, bump this value to
      ;; 30.
      (service-count 30)
      (listeners
       (list (unix-listener-configuration (path "auth-userdb")))))
     (service-configuration (kind "auth-worker"))
     (service-configuration (kind "dict")
      (listeners (list (unix-listener-configuration (path "dict")))))))
   "List of services to enable.  Available services include @samp{imap},
@samp{imap-login}, @samp{pop3}, @samp{pop3-login}, @samp{auth}, and
@samp{lmtp}.")

  (dict
   (dict-configuration (dict-configuration))
   "Dict configuration, as created by the @code{dict-configuration}
constructor.")

  (passdbs
   (passdb-configuration-list (list (passdb-configuration (driver "pam"))))
   "List of passdb configurations, each one created by the
@code{passdb-configuration} constructor.")

  (userdbs
   (userdb-configuration-list (list (userdb-configuration (driver "passwd"))))
   "List of userdb configurations, each one created by the
@code{userdb-configuration} constructor.")

  (plugin-configuration
   (plugin-configuration (plugin-configuration))
   "Plug-in configuration, created by the @code{plugin-configuration}
constructor.")

  (namespaces
   (list-of-namespace-configuration
    (list
     (namespace-configuration
      (name "inbox")
      (prefix "")
      (inbox? #t)
      (mailboxes
       (list
        (mailbox-configuration (name "Drafts") (special-use '("\\Drafts")))
        (mailbox-configuration (name "Junk") (special-use '("\\Junk")))
        (mailbox-configuration (name "Trash") (special-use '("\\Trash")))
        (mailbox-configuration (name "Sent") (special-use '("\\Sent")))
        (mailbox-configuration (name "Sent Messages") (special-use '("\\Sent")))
        (mailbox-configuration (name "Drafts") (special-use '("\\Drafts"))))))))
   "List of namespaces.  Each item in the list is created by the
@code{namespace-configuration} constructor.")

  (base-dir
   (file-name "/var/run/dovecot/")
   "Base directory where to store runtime data.")

  (login-greeting
   (string "Dovecot ready.")
   "Greeting message for clients.")

  (login-trusted-networks
   (space-separated-string-list '())
   "List of trusted network ranges.  Connections from these IPs are
allowed to override their IP addresses and ports (for logging and for
authentication checks).  @samp{disable-plaintext-auth} is also ignored
for these networks.  Typically you'd specify your IMAP proxy servers
here.")

  (login-access-sockets
   (space-separated-string-list '())
   "List of login access check sockets (e.g. tcpwrap).")

  (verbose-proctitle?
   (boolean #f)
   "Show more verbose process titles (in ps).  Currently shows user name
and IP address.  Useful for seeing who are actually using the IMAP
processes (e.g. shared mailboxes or if same uid is used for multiple
accounts).")

  (shutdown-clients?
   (boolean #t)
   "Should all processes be killed when Dovecot master process shuts down.
Setting this to @code{#f} means that Dovecot can be upgraded without
forcing existing client connections to close (although that could also
be a problem if the upgrade is e.g. because of a security fix).")

  (doveadm-worker-count
   (non-negative-integer 0)
   "If non-zero, run mail commands via this many connections to doveadm
server, instead of running them directly in the same process.")

  (doveadm-socket-path
   (string "doveadm-server")
   "UNIX socket or host:port used for connecting to doveadm server.")

  (import-environment
   (space-separated-string-list '("TZ"))
   "List of environment variables that are preserved on Dovecot startup
and passed down to all of its child processes.  You can also give
key=value pairs to always set specific settings.")

;;; Authentication processes

  (disable-plaintext-auth?
   (boolean #t)
   "Disable LOGIN command and all other plaintext authentications unless
SSL/TLS is used (LOGINDISABLED capability).  Note that if the remote IP
matches the local IP (i.e. you're connecting from the same computer),
the connection is considered secure and plaintext authentication is
allowed.  See also ssl=required setting.")

  (auth-cache-size
   (non-negative-integer 0)
   "Authentication cache size (e.g. @samp{#e10e6}).  0 means it's disabled.
Note that bsdauth, PAM and vpopmail require @samp{cache-key} to be set
for caching to be used.")

  (auth-cache-ttl
   (string "1 hour")
   "Time to live for cached data.  After TTL expires the cached record
is no longer used, *except* if the main database lookup returns internal
failure.  We also try to handle password changes automatically: If
user's previous authentication was successful, but this one wasn't, the
cache isn't used.  For now this works only with plaintext
authentication.")

  (auth-cache-negative-ttl
   (string "1 hour")
   "TTL for negative hits (user not found, password mismatch).
0 disables caching them completely.")

  (auth-realms
   (space-separated-string-list '())
   "List of realms for SASL authentication mechanisms that need them.
You can leave it empty if you don't want to support multiple realms.
Many clients simply use the first one listed here, so keep the default
realm first.")

  (auth-default-realm
   (string "")
   "Default realm/domain to use if none was specified.  This is used for
both SASL realms and appending @@domain to username in plaintext
logins.")

  (auth-username-chars
   (string
    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@")
   "List of allowed characters in username.  If the user-given username
contains a character not listed in here, the login automatically fails.
This is just an extra check to make sure user can't exploit any
potential quote escaping vulnerabilities with SQL/LDAP databases.  If
you want to allow all characters, set this value to empty.")

  (auth-username-translation
   (string "")
   "Username character translations before it's looked up from
databases.  The value contains series of from -> to characters.  For
example @samp{#@@/@@} means that @samp{#} and @samp{/} characters are
translated to @samp{@@}.")

  (auth-username-format
   (string "%Lu")
   "Username formatting before it's looked up from databases.  You can
use the standard variables here, e.g. %Lu would lowercase the username,
%n would drop away the domain if it was given, or @samp{%n-AT-%d} would
change the @samp{@@} into @samp{-AT-}.  This translation is done after
@samp{auth-username-translation} changes.")

  (auth-master-user-separator
   (string "")
   "If you want to allow master users to log in by specifying the master
username within the normal username string (i.e. not using SASL
mechanism's support for it), you can specify the separator character
here.  The format is then <username><separator><master username>.
UW-IMAP uses @samp{*} as the separator, so that could be a good
choice.")

  (auth-anonymous-username
   (string "anonymous")
   "Username to use for users logging in with ANONYMOUS SASL
mechanism.")

  (auth-worker-max-count
   (non-negative-integer 30)
   "Maximum number of dovecot-auth worker processes.  They're used to
execute blocking passdb and userdb queries (e.g. MySQL and PAM).
They're automatically created and destroyed as needed.")

  (auth-gssapi-hostname
   (string "")
   "Host name to use in GSSAPI principal names.  The default is to use
the name returned by gethostname().  Use @samp{$ALL} (with quotes) to
allow all keytab entries.")

  (auth-krb5-keytab
   (string "")
   "Kerberos keytab to use for the GSSAPI mechanism.  Will use the
system default (usually /etc/krb5.keytab) if not specified.  You may
need to change the auth service to run as root to be able to read this
file.")

  (auth-use-winbind?
   (boolean #f)
   "Do NTLM and GSS-SPNEGO authentication using Samba's winbind daemon
and @samp{ntlm-auth} helper.
<doc/wiki/Authentication/Mechanisms/Winbind.txt>.")

  (auth-winbind-helper-path
   (file-name "/usr/bin/ntlm_auth")
   "Path for Samba's @samp{ntlm-auth} helper binary.")

  (auth-failure-delay
   (string "2 secs")
   "Time to delay before replying to failed authentications.")

  (auth-ssl-require-client-cert?
   (boolean #f)
   "Require a valid SSL client certificate or the authentication
fails.")

  (auth-ssl-username-from-cert?
   (boolean #f)
   "Take the username from client's SSL certificate, using
@code{X509_NAME_get_text_by_NID()} which returns the subject's DN's
CommonName.")

  (auth-mechanisms
   (space-separated-string-list '("plain"))
   "List of wanted authentication mechanisms.  Supported mechanisms are:
@samp{plain}, @samp{login}, @samp{digest-md5}, @samp{cram-md5},
@samp{ntlm}, @samp{rpa}, @samp{apop}, @samp{anonymous}, @samp{gssapi},
@samp{otp}, @samp{skey}, and @samp{gss-spnego}.  NOTE: See also
@samp{disable-plaintext-auth} setting.")

  (director-servers
   (space-separated-string-list '())
   "List of IPs or hostnames to all director servers, including ourself.
Ports can be specified as ip:port.  The default port is the same as what
director service's @samp{inet-listener} is using.")

  (director-mail-servers
   (space-separated-string-list '())
   "List of IPs or hostnames to all backend mail servers.  Ranges are
allowed too, like 10.0.0.10-10.0.0.30.")

  (director-user-expire
   (string "15 min")
   "How long to redirect users to a specific server after it no longer
has any connections.")

  (director-doveadm-port
   (non-negative-integer 0)
   "TCP/IP port that accepts doveadm connections (instead of director
connections) If you enable this, you'll also need to add
@samp{inet-listener} for the port.")

  (director-username-hash
   (string "%Lu")
   "How the username is translated before being hashed.  Useful values
include %Ln if user can log in with or without @@domain, %Ld if mailboxes
are shared within domain.")

;;; Log destination.

  (log-path
   (string "syslog")
   "Log file to use for error messages.  @samp{syslog} logs to syslog,
@samp{/dev/stderr} logs to stderr.")

  (info-log-path
   (string "")
   "Log file to use for informational messages.  Defaults to
@samp{log-path}.")

  (debug-log-path
   (string "")
   "Log file to use for debug messages.  Defaults to
@samp{info-log-path}.")

  (syslog-facility
   (string "mail")
   "Syslog facility to use if you're logging to syslog.  Usually if you
don't want to use @samp{mail}, you'll use local0..local7.  Also other
standard facilities are supported.")

  (auth-verbose?
   (boolean #f)
   "Log unsuccessful authentication attempts and the reasons why they
failed.")

  (auth-verbose-passwords?
   (boolean #f)
   "In case of password mismatches, log the attempted password.  Valid
values are no, plain and sha1.  sha1 can be useful for detecting brute
force password attempts vs.  user simply trying the same password over
and over again.  You can also truncate the value to n chars by appending
\":n\" (e.g. sha1:6).")

  (auth-debug?
   (boolean #f)
   "Even more verbose logging for debugging purposes.  Shows for example
SQL queries.")

  (auth-debug-passwords?
   (boolean #f)
   "In case of password mismatches, log the passwords and used scheme so
the problem can be debugged.  Enabling this also enables
@samp{auth-debug}.")

  (mail-debug?
   (boolean #f)
   "Enable mail process debugging.  This can help you figure out why
Dovecot isn't finding your mails.")

  (verbose-ssl?
   (boolean #f)
   "Show protocol level SSL errors.")

  (log-timestamp
   (string "\"%b %d %H:%M:%S \"")
   "Prefix for each line written to log file.  % codes are in
strftime(3) format.")

  (login-log-format-elements
   (space-separated-string-list
    '("user=<%u>" "method=%m" "rip=%r" "lip=%l" "mpid=%e" "%c"))
   "List of elements we want to log.  The elements which have a
non-empty variable value are joined together to form a comma-separated
string.")

  (login-log-format
   (string "%$: %s")
   "Login log format.  %s contains @samp{login-log-format-elements}
string, %$ contains the data we want to log.")

  (mail-log-prefix
   (string "\"%s(%u): \"")
   "Log prefix for mail processes.  See doc/wiki/Variables.txt for list
of possible variables you can use.")

  (deliver-log-format
   (string "msgid=%m: %$")
   "Format to use for logging mail deliveries.  You can use variables:
@table @code
@item %$
Delivery status message (e.g. @samp{saved to INBOX})
@item %m
Message-ID
@item %s
Subject
@item %f
From address
@item %p
Physical size
@item %w
Virtual size.
@end table")

;;; Mailbox locations and namespaces

  (mail-location
   (string "")
   "Location for users' mailboxes.  The default is empty, which means
that Dovecot tries to find the mailboxes automatically.  This won't work
if the user doesn't yet have any mail, so you should explicitly tell
Dovecot the full location.

If you're using mbox, giving a path to the INBOX
file (e.g. /var/mail/%u) isn't enough.  You'll also need to tell Dovecot
where the other mailboxes are kept.  This is called the \"root mail
directory\", and it must be the first path given in the
@samp{mail-location} setting.

There are a few special variables you can use, eg.:

@table @samp
@item %u
username
@item %n
user part in user@@domain, same as %u if there's no domain
@item %d
domain part in user@@domain, empty if there's no domain
@item %h
home director
@end table

See doc/wiki/Variables.txt for full list.  Some examples:
@table @samp
@item maildir:~/Maildir
@item mbox:~/mail:INBOX=/var/mail/%u
@item mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%
@end table")

  (mail-uid
   (string "")
   "System user and group used to access mails.  If you use multiple,
userdb can override these by returning uid or gid fields.  You can use
either numbers or names.  <doc/wiki/UserIds.txt>.")

  (mail-gid
   (string "")
   "")

  (mail-privileged-group
   (string "")
   "Group to enable temporarily for privileged operations.  Currently
this is used only with INBOX when either its initial creation or
dotlocking fails.  Typically this is set to \"mail\" to give access to
/var/mail.")

  (mail-access-groups
   (string "")
   "Grant access to these supplementary groups for mail processes.
Typically these are used to set up access to shared mailboxes.  Note
that it may be dangerous to set these if users can create
symlinks (e.g. if \"mail\" group is set here, ln -s /var/mail ~/mail/var
could allow a user to delete others' mailboxes, or ln -s
/secret/shared/box ~/mail/mybox would allow reading it).")

  (mail-full-filesystem-access?
   (boolean #f)
   "Allow full file system access to clients.  There's no access checks
other than what the operating system does for the active UID/GID.  It
works with both maildir and mboxes, allowing you to prefix mailboxes
names with e.g. /path/ or ~user/.")

;;; Mail processes

  (mmap-disable?
   (boolean #f)
   "Don't use mmap() at all.  This is required if you store indexes to
shared file systems (NFS or clustered file system).")

  (dotlock-use-excl?
   (boolean #t)
   "Rely on @samp{O_EXCL} to work when creating dotlock files.  NFS
supports @samp{O_EXCL} since version 3, so this should be safe to use
nowadays by default.")

  (mail-fsync
   (string "optimized")
   "When to use fsync() or fdatasync() calls:
@table @code
@item optimized
Whenever necessary to avoid losing important data
@item always
Useful with e.g. NFS when write()s are delayed
@item never
Never use it (best performance, but crashes can lose data).
@end table")

  (mail-nfs-storage?
   (boolean #f)
   "Mail storage exists in NFS.  Set this to yes to make Dovecot flush
NFS caches whenever needed.  If you're using only a single mail server
this isn't needed.")

  (mail-nfs-index?
   (boolean #f)
   "Mail index files also exist in NFS.  Setting this to yes requires
@samp{mmap-disable? #t} and @samp{fsync-disable? #f}.")

  (lock-method
   (string "fcntl")
   "Locking method for index files.  Alternatives are fcntl, flock and
dotlock.  Dotlocking uses some tricks which may create more disk I/O
than other locking methods.  NFS users: flock doesn't work, remember to
change @samp{mmap-disable}.")

  (mail-temp-dir
   (file-name "/tmp")
   "Directory in which LDA/LMTP temporarily stores incoming mails >128
kB.")

  (first-valid-uid
   (non-negative-integer 500)
   "Valid UID range for users.  This is mostly to make sure that users can't
log in as daemons or other system users.  Note that denying root logins is
hardcoded to dovecot binary and can't be done even if @samp{first-valid-uid}
is set to 0.")

  (last-valid-uid
   (non-negative-integer 0)
   "")

  (first-valid-gid
   (non-negative-integer 1)
   "Valid GID range for users.  Users having non-valid GID as primary group ID
aren't allowed to log in.  If user belongs to supplementary groups with
non-valid GIDs, those groups are not set.")

  (last-valid-gid
   (non-negative-integer 0)
   "")

  (mail-max-keyword-length
   (non-negative-integer 50)
   "Maximum allowed length for mail keyword name.  It's only forced when
trying to create new keywords.")

  (valid-chroot-dirs
   (colon-separated-file-name-list '())
   "List of directories under which chrooting is allowed for mail
processes (i.e. /var/mail will allow chrooting to /var/mail/foo/bar
too).  This setting doesn't affect @samp{login-chroot}
@samp{mail-chroot} or auth chroot settings.  If this setting is empty,
\"/./\" in home dirs are ignored.  WARNING: Never add directories here
which local users can modify, that may lead to root exploit.  Usually
this should be done only if you don't allow shell access for users.
<doc/wiki/Chrooting.txt>.")

  (mail-chroot
   (string "")
   "Default chroot directory for mail processes.  This can be overridden
for specific users in user database by giving /./ in user's home
directory (e.g. /home/./user chroots into /home).  Note that usually
there is no real need to do chrooting, Dovecot doesn't allow users to
access files outside their mail directory anyway.  If your home
directories are prefixed with the chroot directory, append \"/.\" to
@samp{mail-chroot}.  <doc/wiki/Chrooting.txt>.")

  (auth-socket-path
   (file-name "/var/run/dovecot/auth-userdb")
   "UNIX socket path to master authentication server to find users.
This is used by imap (for shared users) and lda.")

  (mail-plugin-dir
   (file-name "/usr/lib/dovecot")
   "Directory where to look up mail plugins.")

  (mail-plugins
   (space-separated-string-list '())
   "List of plugins to load for all services.  Plugins specific to IMAP,
LDA, etc. are added to this list in their own .conf files.")


  (mail-cache-min-mail-count
   (non-negative-integer 0)
   "The minimum number of mails in a mailbox before updates are done to
cache file.  This allows optimizing Dovecot's behavior to do less disk
writes at the cost of more disk reads.")

  (mailbox-idle-check-interval
   (string "30 secs")
   "When IDLE command is running, mailbox is checked once in a while to
see if there are any new mails or other changes.  This setting defines
the minimum time to wait between those checks.  Dovecot can also use
dnotify, inotify and kqueue to find out immediately when changes
occur.")

  (mail-save-crlf?
   (boolean #f)
   "Save mails with CR+LF instead of plain LF.  This makes sending those
mails take less CPU, especially with sendfile() syscall with Linux and
FreeBSD.  But it also creates a bit more disk I/O which may just make it
slower.  Also note that if other software reads the mboxes/maildirs,
they may handle the extra CRs wrong and cause problems.")

  (maildir-stat-dirs?
   (boolean #f)
   "By default LIST command returns all entries in maildir beginning
with a dot.  Enabling this option makes Dovecot return only entries
which are directories.  This is done by stat()ing each entry, so it
causes more disk I/O.
 (For systems setting struct @samp{dirent->d_type} this check is free
and it's done always regardless of this setting).")

  (maildir-copy-with-hardlinks?
   (boolean #t)
   "When copying a message, do it with hard links whenever possible.
This makes the performance much better, and it's unlikely to have any
side effects.")

  (maildir-very-dirty-syncs?
   (boolean #f)
   "Assume Dovecot is the only MUA accessing Maildir: Scan cur/
directory only when its mtime changes unexpectedly or when we can't find
the mail otherwise.")

  (mbox-read-locks
   (space-separated-string-list '("fcntl"))
   "Which locking methods to use for locking mbox.  There are four
available:

@table @code
@item dotlock
Create <mailbox>.lock file.  This is the oldest and most NFS-safe
solution.  If you want to use /var/mail/ like directory, the users will
need write access to that directory.
@item dotlock-try
Same as dotlock, but if it fails because of permissions or because there
isn't enough disk space, just skip it.
@item fcntl
Use this if possible.  Works with NFS too if lockd is used.
@item flock
May not exist in all systems.  Doesn't work with NFS. 
@item lockf
May not exist in all systems.  Doesn't work with NFS.
@end table

You can use multiple locking methods; if you do the order they're declared
in is important to avoid deadlocks if other MTAs/MUAs are using multiple
locking methods as well.  Some operating systems don't allow using some of
them simultaneously.")

  (mbox-write-locks
   (space-separated-string-list '("dotlock" "fcntl"))
   "")

  (mbox-lock-timeout
   (string "5 mins")
   "Maximum time to wait for lock (all of them) before aborting.")

  (mbox-dotlock-change-timeout
   (string "2 mins")
   "If dotlock exists but the mailbox isn't modified in any way,
override the lock file after this much time.")

  (mbox-dirty-syncs?
   (boolean #t)
   "When mbox changes unexpectedly we have to fully read it to find out
what changed.  If the mbox is large this can take a long time.  Since
the change is usually just a newly appended mail, it'd be faster to
simply read the new mails.  If this setting is enabled, Dovecot does
this but still safely fallbacks to re-reading the whole mbox file
whenever something in mbox isn't how it's expected to be.  The only real
downside to this setting is that if some other MUA changes message
flags, Dovecot doesn't notice it immediately.  Note that a full sync is
done with SELECT, EXAMINE, EXPUNGE and CHECK commands.")

  (mbox-very-dirty-syncs?
   (boolean #f)
   "Like @samp{mbox-dirty-syncs}, but don't do full syncs even with SELECT,
EXAMINE, EXPUNGE or CHECK commands.  If this is set,
@samp{mbox-dirty-syncs} is ignored.")

  (mbox-lazy-writes?
   (boolean #t)
   "Delay writing mbox headers until doing a full write sync (EXPUNGE
and CHECK commands and when closing the mailbox).  This is especially
useful for POP3 where clients often delete all mails.  The downside is
that our changes aren't immediately visible to other MUAs.")

  (mbox-min-index-size
   (non-negative-integer 0)
   "If mbox size is smaller than this (e.g. 100k), don't write index
files.  If an index file already exists it's still read, just not
updated.")

  (mdbox-rotate-size
   (non-negative-integer #e2e6)
   "Maximum dbox file size until it's rotated.")

  (mdbox-rotate-interval
   (string "1d")
   "Maximum dbox file age until it's rotated.  Typically in days.  Day
begins from midnight, so 1d = today, 2d = yesterday, etc.  0 = check
disabled.")

  (mdbox-preallocate-space?
   (boolean #f)
   "When creating new mdbox files, immediately preallocate their size to
@samp{mdbox-rotate-size}.  This setting currently works only in Linux
with some file systems (ext4, xfs).")

  (mail-attachment-dir
   (string "")
   "sdbox and mdbox support saving mail attachments to external files,
which also allows single instance storage for them.  Other backends
don't support this for now.

WARNING: This feature hasn't been tested much yet.  Use at your own risk.

Directory root where to store mail attachments.  Disabled, if empty.")

  (mail-attachment-min-size
   (non-negative-integer #e128e3)
   "Attachments smaller than this aren't saved externally.  It's also
possible to write a plugin to disable saving specific attachments
externally.")

  (mail-attachment-fs
   (string "sis posix")
   "File system backend to use for saving attachments:
@table @code
@item posix
No SiS done by Dovecot (but this might help FS's own deduplication)
@item sis posix
SiS with immediate byte-by-byte comparison during saving
@item sis-queue posix
SiS with delayed comparison and deduplication.
@end table")

  (mail-attachment-hash
   (string "%{sha1}")
   "Hash format to use in attachment filenames.  You can add any text and
variables: @code{%@{md4@}}, @code{%@{md5@}}, @code{%@{sha1@}},
@code{%@{sha256@}}, @code{%@{sha512@}}, @code{%@{size@}}.  Variables can be
truncated, e.g. @code{%@{sha256:80@}} returns only first 80 bits.")

  (default-process-limit
    (non-negative-integer 100)
    "")

  (default-client-limit
    (non-negative-integer 1000)
    "")

  (default-vsz-limit
    (non-negative-integer #e256e6)
    "Default VSZ (virtual memory size) limit for service processes.
This is mainly intended to catch and kill processes that leak memory
before they eat up everything.")

  (default-login-user
    (string "dovenull")
    "Login user is internally used by login processes.  This is the most
untrusted user in Dovecot system.  It shouldn't have access to anything
at all.")

  (default-internal-user
    (string "dovecot")
    "Internal user is used by unprivileged processes.  It should be
separate from login user, so that login processes can't disturb other
processes.")

  (ssl?
   (string "required")
   "SSL/TLS support: yes, no, required.  <doc/wiki/SSL.txt>.")

  (ssl-cert
   (string "</etc/dovecot/default.pem")
   "PEM encoded X.509 SSL/TLS certificate (public key).")

  (ssl-key
   (string "</etc/dovecot/private/default.pem")
   "PEM encoded SSL/TLS private key.  The key is opened before
dropping root privileges, so keep the key file unreadable by anyone but
root.")

  (ssl-key-password
   (string "")
   "If key file is password protected, give the password here.
Alternatively give it when starting dovecot with -p parameter.  Since
this file is often world-readable, you may want to place this setting
instead to a different.")

  (ssl-ca
   (string "")
   "PEM encoded trusted certificate authority.  Set this only if you
intend to use @samp{ssl-verify-client-cert? #t}.  The file should
contain the CA certificate(s) followed by the matching
CRL(s).  (e.g. @samp{ssl-ca </etc/ssl/certs/ca.pem}).")
  (ssl-require-crl?
   (boolean #t)
   "Require that CRL check succeeds for client certificates.")
  (ssl-verify-client-cert?
   (boolean #f)
   "Request client to send a certificate.  If you also want to require
it, set @samp{auth-ssl-require-client-cert? #t} in auth section.")

  (ssl-cert-username-field
   (string "commonName")
   "Which field from certificate to use for username.  commonName and
x500UniqueIdentifier are the usual choices.  You'll also need to set
@samp{auth-ssl-username-from-cert? #t}.")

  (ssl-parameters-regenerate
   (hours 168)
   "How often to regenerate the SSL parameters file.  Generation is
quite CPU intensive operation.  The value is in hours, 0 disables
regeneration entirely.")

  (ssl-protocols
   (string "!SSLv2")
   "SSL protocols to use.")

  (ssl-cipher-list
   (string "ALL:!LOW:!SSLv2:!EXP:!aNULL")
   "SSL ciphers to use.")

  (ssl-crypto-device
   (string "")
   "SSL crypto device to use, for valid values run \"openssl engine\".")

  (postmaster-address
   (string "postmaster@%d")
   "Address to use when sending rejection mails.
Default is postmaster@@<your domain>.  %d expands to recipient domain.")

  (hostname
   (string "")
   "Hostname to use in various parts of sent mails (e.g. in Message-Id)
and in LMTP replies.  Default is the system's real hostname@@domain.")

  (quota-full-tempfail?
   (boolean #f)
   "If user is over quota, return with temporary failure instead of
bouncing the mail.")

  (sendmail-path
   (file-name "/usr/sbin/sendmail")
   "Binary to use for sending mails.")

  (submission-host
   (string "")
   "If non-empty, send mails via this SMTP host[:port] instead of
sendmail.")

  (rejection-subject
   (string "Rejected: %s")
   "Subject: header to use for rejection mails.  You can use the same
variables as for @samp{rejection-reason} below.")

  (rejection-reason
   (string "Your message to <%t> was automatically rejected:%n%r")
   "Human readable error message for rejection mails.  You can use
variables:

@table @code
@item %n
CRLF
@item %r
reason
@item %s
original subject
@item %t
recipient
@end table")

  (recipient-delimiter
   (string "+")
   "Delimiter character between local-part and detail in email
address.")

  (lda-original-recipient-header
   (string "")
   "Header where the original recipient address (SMTP's RCPT TO:
address) is taken from if not available elsewhere.  With dovecot-lda -a
parameter overrides this.  A commonly used header for this is
X-Original-To.")

  (lda-mailbox-autocreate?
   (boolean #f)
   "Should saving a mail to a nonexistent mailbox automatically create
it?.")

  (lda-mailbox-autosubscribe?
   (boolean #f)
   "Should automatically created mailboxes be also automatically
subscribed?.")


  (imap-max-line-length
   (non-negative-integer #e64e3)
   "Maximum IMAP command line length.  Some clients generate very long
command lines with huge mailboxes, so you may need to raise this if you
get \"Too long argument\" or \"IMAP command line too large\" errors
often.")

  (imap-logout-format
   (string "in=%i out=%o")
   "IMAP logout format string:
@table @code
@item %i
total number of bytes read from client
@item %o
total number of bytes sent to client.
@end table")

  (imap-capability
   (string "")
   "Override the IMAP CAPABILITY response.  If the value begins with '+',
add the given capabilities on top of the defaults (e.g. +XFOO XBAR).")

  (imap-idle-notify-interval
   (string "2 mins")
   "How long to wait between \"OK Still here\" notifications when client
is IDLEing.")

  (imap-id-send
   (string "")
   "ID field names and values to send to clients.  Using * as the value
makes Dovecot use the default value.  The following fields have default
values currently: name, version, os, os-version, support-url,
support-email.")

  (imap-id-log
   (string "")
   "ID fields sent by client to log.  * means everything.")

  (imap-client-workarounds
   (space-separated-string-list '())
   "Workarounds for various client bugs:

@table @code
@item delay-newmail
Send EXISTS/RECENT new mail notifications only when replying to NOOP and
CHECK commands.  Some clients ignore them otherwise, for example OSX
Mail (<v2.1).  Outlook Express breaks more badly though, without this it
may show user \"Message no longer in server\" errors.  Note that OE6
still breaks even with this workaround if synchronization is set to
\"Headers Only\".

@item tb-extra-mailbox-sep
Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) and
adds extra @samp{/} suffixes to mailbox names.  This option causes Dovecot to
ignore the extra @samp{/} instead of treating it as invalid mailbox name.

@item tb-lsub-flags
Show \\Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox).
This makes Thunderbird realize they aren't selectable and show them
greyed out, instead of only later giving \"not selectable\" popup error.
@end table
")

  (imap-urlauth-host
   (string "")
   "Host allowed in URLAUTH URLs sent by client.  \"*\" allows all.")  )

(define-configuration opaque-dovecot-configuration
  (dovecot
   (package dovecot)
   "The dovecot package.")

  (string
   (string (configuration-missing-field 'opaque-dovecot-configuration
                                        'string))
   "The contents of the @code{dovecot.conf} to use."))

(define %dovecot-accounts
  ;; Account and group for the Dovecot daemon.
  (list (user-group (name "dovecot") (system? #t))
        (user-account
         (name "dovecot")
         (group "dovecot")
         (system? #t)
         (comment "Dovecot daemon user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))

        (user-group (name "dovenull") (system? #t))
        (user-account
         (name "dovenull")
         (group "dovenull")
         (system? #t)
         (comment "Dovecot daemon login user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define %dovecot-activation
  ;; Activation gexp.
  #~(begin
      (use-modules (guix build utils))
      (define (mkdir-p/perms directory owner perms)
        (mkdir-p directory)
        (chown "/var/run/dovecot" (passwd:uid owner) (passwd:gid owner))
        (chmod directory perms))
      (define (build-subject parameters)
        (string-concatenate
         (map (lambda (pair)
                (let ((k (car pair)) (v (cdr pair)))
                  (define (escape-char str chr)
                    (string-join (string-split str chr) (string #\\ chr)))
                  (string-append "/" k "="
                                 (escape-char (escape-char v #\=) #\/))))
              (filter (lambda (pair) (cdr pair)) parameters))))
      (define* (create-self-signed-certificate-if-absent
                #:key private-key public-key (owner (getpwnam "root"))
                (common-name (gethostname))
                (organization-name "GuixSD")
                (organization-unit-name "Default Self-Signed Certificate")
                (subject-parameters `(("CN" . ,common-name)
                                      ("O" . ,organization-name)
                                      ("OU" . ,organization-unit-name)))
                (subject (build-subject subject-parameters)))
        ;; Note that by default, OpenSSL outputs keys in PEM format.  This
        ;; is what we want.
        (unless (file-exists? private-key)
          (cond
           ((zero? (system* (string-append #$openssl "/bin/openssl")
                            "genrsa" "-out" private-key "2048"))
            (chown private-key (passwd:uid owner) (passwd:gid owner))
            (chmod private-key #o400))
           (else
            (format (current-error-port)
                    "Failed to create private key at ~a.\n" private-key))))
        (unless (file-exists? public-key)
          (cond
           ((zero? (system* (string-append #$openssl "/bin/openssl")
                            "req" "-new" "-x509" "-key" private-key
                            "-out" public-key "-days" "3650"
                            "-batch" "-subj" subject))
            (chown public-key (passwd:uid owner) (passwd:gid owner))
            (chmod public-key #o444))
           (else
            (format (current-error-port)
                    "Failed to create public key at ~a.\n" public-key)))))
      (let ((user (getpwnam "dovecot")))
        (mkdir-p/perms "/var/run/dovecot" user #o755)
        (mkdir-p/perms "/var/lib/dovecot" user #o755)
        (mkdir-p/perms "/etc/dovecot" user #o755)
        (mkdir-p/perms "/etc/dovecot/private" user #o700)
        (create-self-signed-certificate-if-absent
         #:private-key "/etc/dovecot/private/default.pem"
         #:public-key "/etc/dovecot/default.pem"
         #:owner (getpwnam "root")
         #:common-name (format #f "Dovecot service on ~a" (gethostname))))))

(define (dovecot-shepherd-service config)
  "Return a list of <shepherd-service> for CONFIG."
  (let* ((config-str
          (cond
           ((opaque-dovecot-configuration? config)
            (opaque-dovecot-configuration-string config))
           (else
            (with-output-to-string
              (lambda ()
                (serialize-configuration config
                                         dovecot-configuration-fields))))))
         (config-file (plain-file "dovecot.conf" config-str))
         (dovecot (if (opaque-dovecot-configuration? config)
                      (opaque-dovecot-configuration-dovecot config)
                      (dovecot-configuration-dovecot config))))
    (list (shepherd-service
           (documentation "Run the Dovecot POP3/IMAP mail server.")
           (provision '(dovecot))
           (requirement '(networking))
           (start #~(make-forkexec-constructor
                     (list (string-append #$dovecot "/sbin/dovecot")
                           "-F" "-c" #$config-file)))
           (stop #~(make-forkexec-constructor
                    (list (string-append #$dovecot "/sbin/dovecot")
                          "-c" #$config-file "stop")))))))

(define %dovecot-pam-services
  (list (unix-pam-service "dovecot")))

(define dovecot-service-type
  (service-type (name 'dovecot)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          dovecot-shepherd-service)
                       (service-extension account-service-type
                                          (const %dovecot-accounts))
                       (service-extension pam-root-service-type
                                          (const %dovecot-pam-services))
                       (service-extension activation-service-type
                                          (const %dovecot-activation))))))

(define* (dovecot-service #:key (config (dovecot-configuration)))
  "Return a service that runs @command{dovecot}, a mail server that can run
POP3, IMAP, and LMTP.  @var{config} should be a configuration object created
by @code{dovecot-configuration}.  @var{config} may also be created by
@code{opaque-dovecot-configuration}, which allows specification of the
@code{dovecot.conf} as a string."
  (validate-configuration config
                          (if (opaque-dovecot-configuration? config)
                              opaque-dovecot-configuration-fields
                              dovecot-configuration-fields))
  (service dovecot-service-type config))

;; A little helper to make it easier to document all those fields.
(define (generate-dovecot-documentation)
  (generate-documentation
    `((dovecot-configuration
       ,dovecot-configuration-fields
       (dict dict-configuration)
       (namespaces namespace-configuration)
       (plugin plugin-configuration)
       (passdbs passdb-configuration)
       (userdbs userdb-configuration)
       (services service-configuration)
       (protocols protocol-configuration))
      (dict-configuration ,dict-configuration-fields)
      (plugin-configuration ,plugin-configuration-fields)
      (passdb-configuration ,passdb-configuration-fields)
      (userdb-configuration ,userdb-configuration-fields)
      (unix-listener-configuration ,unix-listener-configuration-fields)
      (fifo-listener-configuration ,fifo-listener-configuration-fields)
      (inet-listener-configuration ,inet-listener-configuration-fields)
      (namespace-configuration
       ,namespace-configuration-fields
       (mailboxes mailbox-configuration))
      (mailbox-configuration ,mailbox-configuration-fields)
      (service-configuration
       ,service-configuration-fields
       (listeners unix-listener-configuration fifo-listener-configuration
                  inet-listener-configuration))
      (protocol-configuration ,protocol-configuration-fields))
  'dovecot-configuration))

debug log:

solving 4db0328 ...
found 4db0328 in https://yhetil.org/guix/20161124191531.641ec0f9@lepiller.eu/ ||
	https://yhetil.org/guix/20161123220826.4ac6398b@lepiller.eu/
found cb0f119 in https://git.savannah.gnu.org/cgit/guix.git
preparing index
index prepared:
100644 cb0f119f4330889152dd2769811dc42199d12281	gnu/services/mail.scm

applying [1/1] https://yhetil.org/guix/20161124191531.641ec0f9@lepiller.eu/
diff --git a/gnu/services/mail.scm b/gnu/services/mail.scm
index cb0f119..4db0328 100644

Checking patch gnu/services/mail.scm...
Applied patch gnu/services/mail.scm cleanly.

skipping https://yhetil.org/guix/20161123220826.4ac6398b@lepiller.eu/ for 4db0328
index at:
100644 4db0328962d96bf8a0a120180f3ef871090ce9e3	gnu/services/mail.scm

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/guix.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.