summaryrefslogtreecommitdiff
path: root/web/lib/acctfuncs.inc.php
blob: 6bc66461bf65a4b1056aa74fd16f6d9c46d11e87 (plain)
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
<?php

/**
 * Determine if an HTTP request variable is set
 *
 * @param string $name The request variable to test for
 *
 * @return string Return the value of the request variable, otherwise blank
 */
function in_request($name) {
	if (isset($_REQUEST[$name])) {
		return $_REQUEST[$name];
	}
	return "";
}

/**
 * Format the PGP key fingerprint
 *
 * @param string $fingerprint An unformatted PGP key fingerprint
 *
 * @return string PGP fingerprint with spaces every 4 characters
 */
function html_format_pgp_fingerprint($fingerprint) {
	if (strlen($fingerprint) != 40 || !ctype_xdigit($fingerprint)) {
		return $fingerprint;
	}

	return htmlspecialchars(substr($fingerprint, 0, 4) . " " .
		substr($fingerprint, 4, 4) . " " .
		substr($fingerprint, 8, 4) . " " .
		substr($fingerprint, 12, 4) . " " .
		substr($fingerprint, 16, 4) . "  " .
		substr($fingerprint, 20, 4) . " " .
		substr($fingerprint, 24, 4) . " " .
		substr($fingerprint, 28, 4) . " " .
		substr($fingerprint, 32, 4) . " " .
		substr($fingerprint, 36, 4) . " ", ENT_QUOTES);
}

/**
 * Loads the account editing form, with any values that are already saved
 *
 * @global array $SUPPORTED_LANGS Languages that are supported by the aurweb instance
 * @param string $A Form to use, either UpdateAccount or NewAccount
 * @param string $U The username to display
 * @param string $T The account type of the displayed user
 * @param string $S Whether the displayed user has a suspended account
 * @param string $E The e-mail address of the displayed user
 * @param string $H Whether the e-mail address of the displayed user is hidden
 * @param string $P The password value of the displayed user
 * @param string $C The confirmed password value of the displayed user
 * @param string $R The real name of the displayed user
 * @param string $L The language preference of the displayed user
 * @param string $HP The homepage of the displayed user
 * @param string $I The IRC nickname of the displayed user
 * @param string $K The PGP key fingerprint of the displayed user
 * @param string $PK The list of SSH public keys
 * @param string $J The inactivity status of the displayed user
 * @param string $CN Whether to notify of new comments
 * @param string $UN Whether to notify of package updates
 * @param string $ON Whether to notify of ownership changes
 * @param string $UID The user ID of the displayed user
 * @param string $N The username as present in the database
 *
 * @return void
 */
function display_account_form($A,$U="",$T="",$S="",$E="",$H="",$P="",$C="",$R="",
		$L="",$HP="",$I="",$K="",$PK="",$J="",$CN="",$UN="",$ON="",$UID=0,$N="") {
	global $SUPPORTED_LANGS;

	include("account_edit_form.php");
	return;
}

/**
 * Process information given to new/edit account form
 *
 * @global array $SUPPORTED_LANGS Languages that are supported by the aurweb instance
 * @param string $TYPE Either "edit" for editing or "new" for registering an account
 * @param string $A Form to use, either UpdateAccount or NewAccount
 * @param string $U The username for the account
 * @param string $T The account type for the user
 * @param string $S Whether or not the account is suspended
 * @param string $E The e-mail address for the user
 * @param string $H Whether or not the e-mail address should be hidden
 * @param string $P The password for the user
 * @param string $C The confirmed password for the user
 * @param string $R The real name of the user
 * @param string $L The language preference of the user
 * @param string $HP The homepage of the displayed user
 * @param string $I The IRC nickname of the user
 * @param string $K The PGP fingerprint of the user
 * @param string $PK The list of public SSH keys
 * @param string $J The inactivity status of the user
 * @param string $CN Whether to notify of new comments
 * @param string $UN Whether to notify of package updates
 * @param string $ON Whether to notify of ownership changes
 * @param string $UID The user ID of the modified account
 * @param string $N The username as present in the database
 *
 * @return array Boolean indicating success and message to be printed
 */
function process_account_form($TYPE,$A,$U="",$T="",$S="",$E="",$H="",$P="",$C="",
		$R="",$L="",$HP="",$I="",$K="",$PK="",$J="",$CN="",$UN="",$ON="",$UID=0,$N="") {
	global $SUPPORTED_LANGS;

	$error = '';
	$message = '';

	if (is_ipbanned()) {
		$error = __('Account registration has been disabled ' .
					'for your IP address, probably due ' .
					'to sustained spam attacks. Sorry for the ' .
					'inconvenience.');
	}

	$dbh = DB::connect();

	if(isset($_COOKIE['AURSID'])) {
		$editor_user = uid_from_sid($_COOKIE['AURSID']);
	}
	else {
		$editor_user = null;
	}

	if (empty($E) || empty($U)) {
		$error = __("Missing a required field.");
	}

	if ($TYPE != "new" && !$UID) {
		$error = __("Missing User ID");
	}

	if (!$error && !valid_username($U)) {
		$length_min = config_get_int('options', 'username_min_len');
		$length_max = config_get_int('options', 'username_max_len');

		$error = __("The username is invalid.") . "<ul>\n"
			. "<li>" . __("It must be between %s and %s characters long", $length_min, $length_max)
			. "</li>"
			. "<li>" . __("Start and end with a letter or number") . "</li>"
			. "<li>" . __("Can contain only one period, underscore or hyphen.")
			. "</li>\n</ul>";
	}

	if (!$error && $P && $C && ($P != $C)) {
		$error = __("Password fields do not match.");
	}
	if (!$error && $P != '' && !good_passwd($P)) {
		$length_min = config_get_int('options', 'passwd_min_len');
		$error = __("Your password must be at least %s characters.",
			$length_min);
	}

	if (!$error && !valid_email($E)) {
		$error = __("The email address is invalid.");
	}

	if (!$error && $K != '' && !valid_pgp_fingerprint($K)) {
		$error = __("The PGP key fingerprint is invalid.");
	}

	if (!$error && !empty($PK)) {
		$ssh_keys = array_filter(array_map('trim', explode("\n", $PK)));
		$ssh_fingerprints = array();

		foreach ($ssh_keys as &$ssh_key) {
			if (!valid_ssh_pubkey($ssh_key)) {
				$error = __("The SSH public key is invalid.");
				break;
			}

			$ssh_fingerprint = ssh_key_fingerprint($ssh_key);
			if (!$ssh_fingerprint) {
				$error = __("The SSH public key is invalid.");
				break;
			}

			$tokens = explode(" ", $ssh_key);
			$ssh_key = $tokens[0] . " " . $tokens[1];

			$ssh_fingerprints[] = $ssh_fingerprint;
		}

		/*
		 * Destroy last reference to prevent accidentally overwriting
		 * an array element.
		 */
		unset($ssh_key);
	}

	if (isset($_COOKIE['AURSID'])) {
		$atype = account_from_sid($_COOKIE['AURSID']);
		if (($atype == "User" && $T > 1) || ($atype == "Trusted User" && $T > 2)) {
			$error = __("Cannot increase account permissions.");
		}
	}

	if (!$error && !array_key_exists($L, $SUPPORTED_LANGS)) {
		$error = __("Language is not currently supported.");
	}
	if (!$error) {
		/*
		 * Check whether the user name is available.
		 * TODO: Fix race condition.
		 */
		$q = "SELECT COUNT(*) AS CNT FROM Users ";
		$q.= "WHERE Username = " . $dbh->quote($U);
		if ($TYPE == "edit") {
			$q.= " AND ID != ".intval($UID);
		}
		$result = $dbh->query($q);
		$row = $result->fetch(PDO::FETCH_NUM);

		if ($row[0]) {
			$error = __("The username, %s%s%s, is already in use.",
				"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
		}
	}
	if (!$error) {
		/*
		 * Check whether the e-mail address is available.
		 * TODO: Fix race condition.
		 */
		$q = "SELECT COUNT(*) AS CNT FROM Users ";
		$q.= "WHERE Email = " . $dbh->quote($E);
		if ($TYPE == "edit") {
			$q.= " AND ID != ".intval($UID);
		}
		$result = $dbh->query($q);
		$row = $result->fetch(PDO::FETCH_NUM);

		if ($row[0]) {
			$error = __("The address, %s%s%s, is already in use.",
					"<strong>", htmlspecialchars($E,ENT_QUOTES), "</strong>");
		}
	}
	if (!$error && count($ssh_keys) > 0) {
		/*
		 * Check whether any of the SSH public keys is already in use.
		 * TODO: Fix race condition.
		 */
		$q = "SELECT Fingerprint FROM SSHPubKeys ";
		$q.= "WHERE Fingerprint IN (";
		$q.= implode(',', array_map(array($dbh, 'quote'), $ssh_fingerprints));
		$q.= ")";
		if ($TYPE == "edit") {
			$q.= " AND UserID != " . intval($UID);
		}
		$result = $dbh->query($q);
		$row = $result->fetch(PDO::FETCH_NUM);

		if ($row) {
			$error = __("The SSH public key, %s%s%s, is already in use.",
					"<strong>", htmlspecialchars($row[0], ENT_QUOTES), "</strong>");
		}
	}

	if ($error) {
		$message = "<ul class='errorlist'><li>".$error."</li></ul>\n";
		return array(false, $message);
	}

	if ($TYPE == "new") {
		/* Create an unprivileged user. */
		$salt = generate_salt();
		if (empty($P)) {
			$send_resetkey = true;
			$email = $E;
		} else {
			$send_resetkey = false;
			$P = salted_hash($P, $salt);
		}
		$U = $dbh->quote($U);
		$E = $dbh->quote($E);
		$P = $dbh->quote($P);
		$salt = $dbh->quote($salt);
		$R = $dbh->quote($R);
		$L = $dbh->quote($L);
		$HP = $dbh->quote($HP);
		$I = $dbh->quote($I);
		$K = $dbh->quote(str_replace(" ", "", $K));
		$q = "INSERT INTO Users (AccountTypeID, Suspended, ";
		$q.= "InactivityTS, Username, Email, Passwd, Salt, ";
		$q.= "RealName, LangPreference, Homepage, IRCNick, PGPKey) ";
		$q.= "VALUES (1, 0, 0, $U, $E, $P, $salt, $R, $L, ";
		$q.= "$HP, $I, $K)";
		$result = $dbh->exec($q);
		if (!$result) {
			$message = __("Error trying to create account, %s%s%s.",
					"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
			return array(false, $message);
		}

		$uid = $dbh->lastInsertId();
		account_set_ssh_keys($uid, $ssh_keys, $ssh_fingerprints);

		$message = __("The account, %s%s%s, has been successfully created.",
				"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
		$message .= "<p>\n";

		if ($send_resetkey) {
			send_resetkey($email, true);
			$message .= __("A password reset key has been sent to your e-mail address.");
			$message .= "</p>\n";
		} else {
			$message .= __("Click on the Login link above to use your account.");
			$message .= "</p>\n";
		}
	} else {
		/* Modify an existing account. */
		$q = "SELECT InactivityTS FROM Users WHERE ";
		$q.= "ID = " . intval($UID);
		$result = $dbh->query($q);
		$row = $result->fetch(PDO::FETCH_NUM);
		if ($row[0] && $J) {
			$inactivity_ts = $row[0];
		} elseif ($J) {
			$inactivity_ts = time();
		} else {
			$inactivity_ts = 0;
		}

		$q = "UPDATE Users SET ";
		$q.= "Username = " . $dbh->quote($U);
		if ($T) {
			$q.= ", AccountTypeID = ".intval($T);
		}
		if ($S) {
			/* Ensure suspended users can't keep an active session */
			delete_user_sessions($UID);
			$q.= ", Suspended = 1";
		} else {
			$q.= ", Suspended = 0";
		}
		$q.= ", Email = " . $dbh->quote($E);
		if ($H) {
			$q.= ", HideEmail = 1";
		} else {
			$q.= ", HideEmail = 0";
		}
		if ($P) {
			$salt = generate_salt();
			$hash = salted_hash($P, $salt);
			$q .= ", Passwd = '$hash', Salt = '$salt'";
		}
		$q.= ", RealName = " . $dbh->quote($R);
		$q.= ", LangPreference = " . $dbh->quote($L);
		$q.= ", Homepage = " . $dbh->quote($HP);
		$q.= ", IRCNick = " . $dbh->quote($I);
		$q.= ", PGPKey = " . $dbh->quote(str_replace(" ", "", $K));
		$q.= ", InactivityTS = " . $inactivity_ts;
		$q.= ", CommentNotify = " . ($CN ? "1" : "0");
		$q.= ", UpdateNotify = " . ($UN ? "1" : "0");
		$q.= ", OwnershipNotify = " . ($ON ? "1" : "0");
		$q.= " WHERE ID = ".intval($UID);
		$result = $dbh->exec($q);

		$ssh_key_result = account_set_ssh_keys($UID, $ssh_keys, $ssh_fingerprints);

		if ($result === false || $ssh_key_result === false) {
			$message = __("No changes were made to the account, %s%s%s.",
					"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
		} else {
			$message = __("The account, %s%s%s, has been successfully modified.",
					"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
		}
	}

	return array(true, $message);
}

/**
 * Display the search results page
 *
 * @param string $O The offset for the results page
 * @param string $SB The column to sort the results page by
 * @param string $U The username search criteria
 * @param string $T The account type search criteria
 * @param string $S Whether the account is suspended search criteria
 * @param string $E The e-mail address search criteria
 * @param string $R The real name search criteria
 * @param string $I The IRC nickname search criteria
 * @param string $K The PGP key fingerprint search criteria
 *
 * @return void
 */
function search_results_page($O=0,$SB="",$U="",$T="",
		$S="",$E="",$R="",$I="",$K="") {

	$HITS_PER_PAGE = 50;
	if ($O) {
		$OFFSET = intval($O);
	} else {
		$OFFSET = 0;
	}
	if ($OFFSET < 0) {
		$OFFSET = 0;
	}
	$search_vars = array();

	$dbh = DB::connect();

	$q = "SELECT Users.*, AccountTypes.AccountType ";
	$q.= "FROM Users, AccountTypes ";
	$q.= "WHERE AccountTypes.ID = Users.AccountTypeID ";
	if ($T == "u") {
		$q.= "AND AccountTypes.ID = 1 ";
		$search_vars[] = "T";
	} elseif ($T == "t") {
		$q.= "AND AccountTypes.ID = 2 ";
		$search_vars[] = "T";
	} elseif ($T == "d") {
		$q.= "AND AccountTypes.ID = 3 ";
		$search_vars[] = "T";
	} elseif ($T == "td") {
		$q.= "AND AccountTypes.ID = 4 ";
		$search_vars[] = "T";
	}
	if ($S) {
		$q.= "AND Users.Suspended = 1 ";
		$search_vars[] = "S";
	}
	if ($U) {
		$U = "%" . addcslashes($U, '%_') . "%";
		$q.= "AND Username LIKE " . $dbh->quote($U) . " ";
		$search_vars[] = "U";
	}
	if ($E) {
		$E = "%" . addcslashes($E, '%_') . "%";
		$q.= "AND Email LIKE " . $dbh->quote($E) . " ";
		$search_vars[] = "E";
	}
	if ($R) {
		$R = "%" . addcslashes($R, '%_') . "%";
		$q.= "AND RealName LIKE " . $dbh->quote($R) . " ";
		$search_vars[] = "R";
	}
	if ($I) {
		$I = "%" . addcslashes($I, '%_') . "%";
		$q.= "AND IRCNick LIKE " . $dbh->quote($I) . " ";
		$search_vars[] = "I";
	}
	if ($K) {
		$K = "%" . addcslashes(str_replace(" ", "", $K), '%_') . "%";
		$q.= "AND PGPKey LIKE " . $dbh->quote($K) . " ";
		$search_vars[] = "K";
	}
	switch ($SB) {
		case 't':
			$q.= "ORDER BY AccountTypeID, Username ";
			break;
		case 'r':
			$q.= "ORDER BY RealName, AccountTypeID ";
			break;
		case 'i':
			$q.= "ORDER BY IRCNick, AccountTypeID ";
			break;
		default:
			$q.= "ORDER BY Username, AccountTypeID ";
			break;
	}
	$search_vars[] = "SB";
	$q.= "LIMIT " . $HITS_PER_PAGE . " OFFSET " . $OFFSET;

	$dbh = DB::connect();

	$result = $dbh->query($q);

	while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
		$userinfo[] = $row;
	}

	include("account_search_results.php");
	return;
}

/**
 * Attempt to login and generate a session
 *
 * @return array Session ID for user, error message if applicable
 */
function try_login() {
	$login_error = "";
	$new_sid = "";
	$userID = null;

	if (!isset($_REQUEST['user']) && !isset($_REQUEST['passwd'])) {
		return array('SID' => '', 'error' => null);
	}

	if (is_ipbanned()) {
		$login_error = __('The login form is currently disabled ' .
						'for your IP address, probably due ' .
						'to sustained spam attacks. Sorry for the ' .
						'inconvenience.');
		return array('SID' => '', 'error' => $login_error);
	}

	$dbh = DB::connect();
	$userID = uid_from_loginname($_REQUEST['user']);

	if (user_suspended($userID)) {
		$login_error = __('Account suspended');
		return array('SID' => '', 'error' => $login_error);
	} elseif (passwd_is_empty($userID)) {
		$login_error = __('Your password has been reset. ' .
			'If you just created a new account, please ' .
			'use the link from the confirmation email ' .
			'to set an initial password. Otherwise, ' .
			'please request a reset key on the %s' .
			'Password Reset%s page.', '<a href="' .
			htmlspecialchars(get_uri('/passreset')) . '">',
			'</a>');
		return array('SID' => '', 'error' => $login_error);
	} elseif (!valid_passwd($userID, $_REQUEST['passwd'])) {
		$login_error = __("Bad username or password.");
		return array('SID' => '', 'error' => $login_error);
	}

	$logged_in = 0;
	$num_tries = 0;

	/* Generate a session ID and store it. */
	while (!$logged_in && $num_tries < 5) {
		$session_limit = config_get_int('options', 'max_sessions_per_user');
		if ($session_limit) {
			/*
			 * Delete all user sessions except the
			 * last ($session_limit - 1).
			 */
			$q = "DELETE s.* FROM Sessions s ";
			$q.= "LEFT JOIN (SELECT SessionID FROM Sessions ";
			$q.= "WHERE UsersId = " . $userID . " ";
			$q.= "ORDER BY LastUpdateTS DESC ";
			$q.= "LIMIT " . ($session_limit - 1) . ") q ";
			$q.= "ON s.SessionID = q.SessionID ";
			$q.= "WHERE s.UsersId = " . $userID . " ";
			$q.= "AND q.SessionID IS NULL;";
			$dbh->query($q);
		}

		$new_sid = new_sid();
		$q = "INSERT INTO Sessions (UsersID, SessionID, LastUpdateTS)"
		  ." VALUES (" . $userID . ", '" . $new_sid . "', UNIX_TIMESTAMP())";
		$result = $dbh->exec($q);

		/* Query will fail if $new_sid is not unique. */
		if ($result) {
			$logged_in = 1;
			break;
		}

		$num_tries++;
	}

	if (!$logged_in) {
		$login_error = __('An error occurred trying to generate a user session.');
		return array('SID' => $new_sid, 'error' => $login_error);
	}

	$q = "UPDATE Users SET LastLogin = UNIX_TIMESTAMP(), ";
	$q.= "LastLoginIPAddress = " . $dbh->quote($_SERVER['REMOTE_ADDR']) . " ";
	$q.= "WHERE ID = $userID";
	$dbh->exec($q);

	/* Set the SID cookie. */
	if (isset($_POST['remember_me']) && $_POST['remember_me'] == "on") {
		/* Set cookies for 30 days. */
		$timeout = config_get_int('options', 'persistent_cookie_timeout');
		$cookie_time = time() + $timeout;

		/* Set session for 30 days. */
		$q = "UPDATE Sessions SET LastUpdateTS = $cookie_time ";
		$q.= "WHERE SessionID = '$new_sid'";
		$dbh->exec($q);
	} else {
		$cookie_time = 0;
	}

	setcookie("AURSID", $new_sid, $cookie_time, "/", null, !empty($_SERVER['HTTPS']), true);

	$referer = in_request('referer');
	if (strpos($referer, aur_location()) !== 0) {
		$referer = '/';
	}
	header("Location: " . get_uri($referer));
	$login_error = "";
}

/**
 * Determine if the user is using a banned IP address
 *
 * @return bool True if IP address is banned, otherwise false
 */
function is_ipbanned() {
	$dbh = DB::connect();

	$q = "SELECT * FROM Bans WHERE IPAddress = " . $dbh->quote(ip2long($_SERVER['REMOTE_ADDR']));
	$result = $dbh->query($q);

	return ($result->fetchColumn() ? true : false);
}

/**
 * Validate a username against a collection of rules
 *
 * The username must be longer or equal to the configured minimum length. It
 * must be shorter or equal to the configured maximum length. It must start and
 * end with either a letter or a number. It can contain one period, hypen, or
 * underscore. Returns boolean of whether name is valid.
 *
 * @param string $user Username to validate
 *
 * @return bool True if username meets criteria, otherwise false
 */
function valid_username($user) {
	$length_min = config_get_int('options', 'username_min_len');
	$length_max = config_get_int('options', 'username_max_len');

	if (strlen($user) < $length_min || strlen($user) > $length_max) {
		return false;
	} else if (!preg_match("/^[a-z0-9]+[.\-_]?[a-z0-9]+$/Di", $user)) {
		return false;
	}

	return true;
}

/**
 * Determine if a user already has a proposal open about themselves
 *
 * @param string $user Username to checkout for open proposal
 *
 * @return bool True if there is an open proposal about the user, otherwise false
 */
function open_user_proposals($user) {
	$dbh = DB::connect();
	$q = "SELECT * FROM TU_VoteInfo WHERE User = " . $dbh->quote($user) . " ";
	$q.= "AND End > UNIX_TIMESTAMP()";
	$result = $dbh->query($q);

	return ($result->fetchColumn() ? true : false);
}

/**
 * Add a new Trusted User proposal to the database
 *
 * @param string $agenda The agenda of the vote
 * @param string $user The use the vote is about
 * @param int $votelength The length of time for the vote to last
 * @param string $submitteruid The user ID of the individual who submitted the proposal
 *
 * @return void
 */
function add_tu_proposal($agenda, $user, $votelength, $quorum, $submitteruid) {
	$dbh = DB::connect();

	$q = "SELECT COUNT(*) FROM Users WHERE (AccountTypeID = 2 OR AccountTypeID = 4)";
	$result = $dbh->query($q);
	$row = $result->fetch(PDO::FETCH_NUM);
	$active_tus = $row[0];

	$q = "INSERT INTO TU_VoteInfo (Agenda, User, Submitted, End, Quorum, ";
	$q.= "SubmitterID, ActiveTUs) VALUES ";
	$q.= "(" . $dbh->quote($agenda) . ", " . $dbh->quote($user) . ", ";
	$q.= "UNIX_TIMESTAMP(), UNIX_TIMESTAMP() + " . $dbh->quote($votelength);
	$q.= ", " . $dbh->quote($quorum) . ", " . $submitteruid . ", ";
	$q.= $active_tus . ")";
	$result = $dbh->exec($q);
}

/**
 * Add a reset key to the database for a specified user
 *
 * @param string $resetkey A password reset key to be stored in database
 * @param string $uid The user ID to store the reset key for
 *
 * @return void
 */
function create_resetkey($resetkey, $uid) {
	$dbh = DB::connect();
	$q = "UPDATE Users ";
	$q.= "SET ResetKey = '" . $resetkey . "' ";
	$q.= "WHERE ID = " . $uid;
	$dbh->exec($q);
}

/**
 * Send a reset key to a specific e-mail address
 *
 * @param string $email E-mail address of the user resetting their password
 * @param bool $welcome Whether to use the welcome message
 *
 * @return void
 */
function send_resetkey($email, $welcome=false) {
	$uid = uid_from_email($email);
	if ($uid == null) {
		return;
	}

	/* We (ab)use new_sid() to get a random 32 characters long string. */
	$resetkey = new_sid();
	create_resetkey($resetkey, $uid);

	/* Send e-mail with confirmation link. */
	notify(array($welcome ? 'welcome' : 'send-resetkey', $uid));
}

/**
 * Change a user's password in the database if reset key and e-mail are correct
 *
 * @param string $hash New MD5 hash of a user's password
 * @param string $salt New salt for the user's password
 * @param string $resetkey Code e-mailed to a user to reset a password
 * @param string $email E-mail address of the user resetting their password
 *
 * @return string|void Redirect page if successful, otherwise return error message
 */
function password_reset($hash, $salt, $resetkey, $email) {
	$dbh = DB::connect();
	$q = "UPDATE Users ";
	$q.= "SET Passwd = '$hash', ";
	$q.= "Salt = '$salt', ";
	$q.= "ResetKey = '' ";
	$q.= "WHERE ResetKey != '' ";
	$q.= "AND ResetKey = " . $dbh->quote($resetkey) . " ";
	$q.= "AND Email = " . $dbh->quote($email);
	$result = $dbh->exec($q);

	if (!$result) {
		$error = __('Invalid e-mail and reset key combination.');
		return $error;
	} else {
		header('Location: ' . get_uri('/passreset/') . '?step=complete');
		exit();
	}
}

/**
 * Determine if the password is longer than the minimum length
 *
 * @param string $passwd The password to check
 *
 * @return bool True if longer than minimum length, otherwise false
 */
function good_passwd($passwd) {
	$length_min = config_get_int('options', 'passwd_min_len');
	return (strlen($passwd) >= $length_min);
}

/**
 * Determine if the password is correct and salt it if it hasn't been already
 *
 * @param string $userID The user ID to check the password against
 * @param string $passwd The password the visitor sent
 *
 * @return bool True if password was correct and properly salted, otherwise false
 */
function valid_passwd($userID, $passwd) {
	$dbh = DB::connect();
	if ($passwd == "") {
		return false;
	}

	/* Get salt for this user. */
	$salt = get_salt($userID);
	if ($salt) {
		$q = "SELECT ID FROM Users ";
		$q.= "WHERE ID = " . $userID . " ";
		$q.= "AND Passwd = " . $dbh->quote(salted_hash($passwd, $salt));
		$result = $dbh->query($q);
		if (!$result) {
			return false;
		}

		$row = $result->fetch(PDO::FETCH_NUM);
		return ($row[0] > 0);
	} else {
		/* Check password without using salt. */
		$q = "SELECT ID FROM Users ";
		$q.= "WHERE ID = " . $userID . " ";
		$q.= "AND Passwd = " . $dbh->quote(md5($passwd));
		$result = $dbh->query($q);
		if (!$result) {
			return false;
		}

		$row = $result->fetch(PDO::FETCH_NUM);
		if (!$row[0]) {
			return false;
		}

		/* Password correct, but salt it first! */
		if (!save_salt($userID, $passwd)) {
			trigger_error("Unable to salt user's password;" .
				" ID " . $userID, E_USER_WARNING);
			return false;
		}

		return true;
	}
}

/**
 * Determine if a user's password is empty
 *
 * @param string $uid The user ID to check for an empty password
 *
 * @return bool True if the user's password is empty, otherwise false
 */
function passwd_is_empty($uid) {
	$dbh = DB::connect();

	$q = "SELECT * FROM Users WHERE ID = " . $dbh->quote($uid) . " ";
	$q .= "AND Passwd = " . $dbh->quote('');
	$result = $dbh->query($q);

	if ($result->fetchColumn()) {
		return true;
	} else {
		return false;
	}
}

/**
 * Determine if the PGP key fingerprint is valid (must be 40 hexadecimal digits)
 *
 * @param string $fingerprint PGP fingerprint to check if valid
 *
 * @return bool True if the fingerprint is 40 hexadecimal digits, otherwise false
 */
function valid_pgp_fingerprint($fingerprint) {
	$fingerprint = str_replace(" ", "", $fingerprint);
	return (strlen($fingerprint) == 40 && ctype_xdigit($fingerprint));
}

/**
 * Determine if the SSH public key is valid
 *
 * @param string $pubkey SSH public key to check
 *
 * @return bool True if the SSH public key is valid, otherwise false
 */
function valid_ssh_pubkey($pubkey) {
	$valid_prefixes = array(
		"ssh-rsa", "ssh-dss", "ecdsa-sha2-nistp256",
		"ecdsa-sha2-nistp384", "ecdsa-sha2-nistp521", "ssh-ed25519"
	);

	$has_valid_prefix = false;
	foreach ($valid_prefixes as $prefix) {
		if (strpos($pubkey, $prefix . " ") === 0) {
			$has_valid_prefix = true;
			break;
		}
	}
	if (!$has_valid_prefix) {
		return false;
	}

	$tokens = explode(" ", $pubkey);
	if (empty($tokens[1])) {
		return false;
	}

	return (base64_encode(base64_decode($tokens[1], true)) == $tokens[1]);
}

/**
 * Determine if the user account has been suspended
 *
 * @param string $id The ID of user to check if suspended
 *
 * @return bool True if the user is suspended, otherwise false
 */
function user_suspended($id) {
	$dbh = DB::connect();
	if (!$id) {
		return false;
	}
	$q = "SELECT Suspended FROM Users WHERE ID = " . $id;
	$result = $dbh->query($q);
	if ($result) {
		$row = $result->fetch(PDO::FETCH_NUM);
		if ($row[0]) {
			return true;
		}
	}
	return false;
}

/**
 * Delete a specified user account from the database
 *
 * @param int $id The user ID of the account to be deleted
 *
 * @return void
 */
function user_delete($id) {
	$dbh = DB::connect();
	$id = intval($id);

	/*
	 * These are normally already taken care of by propagation constraints
	 * but it is better to be explicit here.
	 */
	$fields_delete = array(
		array("Sessions", "UsersID"),
		array("PackageVotes", "UsersID"),
		array("PackageNotifications", "UsersID")
	);

	$fields_set_null = array(
		array("PackageBases", "SubmitterUID"),
		array("PackageBases", "MaintainerUID"),
		array("PackageBases", "SubmitterUID"),
		array("PackageComments", "UsersID"),
		array("PackageComments", "DelUsersID"),
		array("PackageRequests", "UsersID"),
		array("TU_VoteInfo", "SubmitterID"),
		array("TU_Votes", "UserID")
	);

	foreach($fields_delete as list($table, $field)) {
		$q = "DELETE FROM " . $table . " ";
		$q.= "WHERE " . $field . " = " . $id;
		$dbh->query($q);
	}

	foreach($fields_set_null as list($table, $field)) {
		$q = "UPDATE " . $table . " SET " . $field . " = NULL ";
		$q.= "WHERE " . $field . " = " . $id;
		$dbh->query($q);
	}

	$q = "DELETE FROM Users WHERE ID = " . $id;
	$dbh->query($q);
	return;
}

/**
 * Remove the session from the database on logout
 *
 * @param string $sid User's session ID
 *
 * @return void
 */
function delete_session_id($sid) {
	$dbh = DB::connect();

	$q = "DELETE FROM Sessions WHERE SessionID = " . $dbh->quote($sid);
	$dbh->query($q);
}

/**
 * Remove all sessions belonging to a particular user
 *
 * @param int $uid ID of user to remove all sessions for
 *
 * @return void
 */
function delete_user_sessions($uid) {
	$dbh = DB::connect();

	$q = "DELETE FROM Sessions WHERE UsersID = " . intval($uid);
	$dbh->exec($q);
}

/**
 * Remove sessions from the database that have exceed the timeout
 *
 * @return void
 */
function clear_expired_sessions() {
	$dbh = DB::connect();

	$timeout = config_get_int('options', 'login_timeout');
	$q = "DELETE FROM Sessions WHERE LastUpdateTS < (UNIX_TIMESTAMP() - " . $timeout . ")";
	$dbh->query($q);

	return;
}

/**
 * Get account details for a specific user
 *
 * @param string $uid The User ID of account to get information for
 * @param string $username The username of the account to get for
 *
 * @return array Account details for the specified user
 */
function account_details($uid, $username) {
	$dbh = DB::connect();
	$q = "SELECT Users.*, AccountTypes.AccountType ";
	$q.= "FROM Users, AccountTypes ";
	$q.= "WHERE AccountTypes.ID = Users.AccountTypeID ";
	if (!empty($uid)) {
		$q.= "AND Users.ID = ".intval($uid);
	} else {
		$q.= "AND Users.Username = " . $dbh->quote($username);
	}
	$result = $dbh->query($q);

	if ($result) {
		$row = $result->fetch(PDO::FETCH_ASSOC);
	}

	return $row;
}

/**
 * Determine if a user has already voted on a specific proposal
 *
 * @param string $voteid The ID of the Trusted User proposal
 * @param string $uid The ID to check if the user already voted
 *
 * @return bool True if the user has already voted, otherwise false
 */
function tu_voted($voteid, $uid) {
	$dbh = DB::connect();

	$q = "SELECT COUNT(*) FROM TU_Votes ";
	$q.= "WHERE VoteID = " . intval($voteid) . " AND UserID = " . intval($uid);
	$result = $dbh->query($q);
	if ($result->fetchColumn() > 0) {
		return true;
	}
	else {
		return false;
	}
}

/**
 * Get all current Trusted User proposals from the database
 *
 * @param string $order Ascending or descending order for the proposal listing
 *
 * @return array The details for all current Trusted User proposals
 */
function current_proposal_list($order) {
	$dbh = DB::connect();

	$q = "SELECT * FROM TU_VoteInfo WHERE End > " . time() . " ORDER BY Submitted " . $order;
	$result = $dbh->query($q);

	$details = array();
	while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
		$details[] = $row;
	}

	return $details;
}

/**
 * Get a subset of all past Trusted User proposals from the database
 *
 * @param string $order Ascending or descending order for the proposal listing
 * @param string $lim The number of proposals to list with the offset
 *
 * @return array The details for the subset of past Trusted User proposals
 */
function past_proposal_list($order, $lim) {
	$dbh = DB::connect();

	$q = "SELECT * FROM TU_VoteInfo WHERE End < " . time() . " ORDER BY Submitted " . $order . $lim;
	$result = $dbh->query($q);

	$details = array();
	while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
		$details[] = $row;
	}

	return $details;
}

/**
 * Get the vote ID of the last vote of all Trusted Users
 *
 * @return array The vote ID of the last vote of each Trusted User
 */
function last_votes_list() {
	$dbh = DB::connect();

	$q = "SELECT UserID, MAX(VoteID) AS LastVote FROM TU_Votes, ";
	$q .= "TU_VoteInfo, Users WHERE TU_VoteInfo.ID = TU_Votes.VoteID AND ";
	$q .= "TU_VoteInfo.End < UNIX_TIMESTAMP() AND ";
	$q .= "Users.ID = TU_Votes.UserID AND (Users.AccountTypeID = 2 OR Users.AccountTypeID = 4) ";
	$q .= "GROUP BY UserID ORDER BY LastVote DESC, UserName ASC";
	$result = $dbh->query($q);

	$details = array();
	while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
		$details[] = $row;
	}

	return $details;
}

/**
 * Determine the total number of Trusted User proposals
 *
 * @return string The total number of Trusted User proposals
 */
function proposal_count() {
	$dbh = DB::connect();
	$q = "SELECT COUNT(*) FROM TU_VoteInfo";
	$result = $dbh->query($q);
	$row = $result->fetch(PDO::FETCH_NUM);

	return $row[0];
}

/**
 * Get all details related to a specific vote from the database
 *
 * @param string $voteid The ID of the Trusted User proposal
 *
 * @return array All stored details for a specific vote
 */
function vote_details($voteid) {
	$dbh = DB::connect();

	$q = "SELECT * FROM TU_VoteInfo ";
	$q.= "WHERE ID = " . intval($voteid);

	$result = $dbh->query($q);
	$row = $result->fetch(PDO::FETCH_ASSOC);

	return $row;
}

/**
 * Get an alphabetical list of users who voted for a proposal with HTML links
 *
 * @param string $voteid The ID of the Trusted User proposal
 *
 * @return array All users who voted for a specific proposal
 */
function voter_list($voteid) {
	$dbh = DB::connect();

	$whovoted = array();

	$q = "SELECT tv.UserID,U.Username ";
	$q.= "FROM TU_Votes tv, Users U ";
	$q.= "WHERE tv.VoteID = " . intval($voteid);
	$q.= " AND tv.UserID = U.ID ";
	$q.= "ORDER BY Username";

	$result = $dbh->query($q);
	if ($result) {
		while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
			$whovoted[] = $row['Username'];
		}
	}
	return $whovoted;
}

/**
 * Cast a vote for a specific user proposal
 *
 * @param string $voteid The ID of the proposal being voted on
 * @param string $uid The user ID of the individual voting
 * @param string $vote Vote position, either "Yes", "No", or "Abstain"
 * @param int $newtotal The total number of votes after the user has voted
 *
 * @return void
 */
function cast_proposal_vote($voteid, $uid, $vote, $newtotal) {
	$dbh = DB::connect();

	$q = "UPDATE TU_VoteInfo SET " . $vote . " = (" . $newtotal . ") WHERE ID = " . $voteid;
	$result = $dbh->exec($q);

	$q = "INSERT INTO TU_Votes (VoteID, UserID) VALUES (" . intval($voteid) . ", " . intval($uid) . ")";
	$result = $dbh->exec($q);
}

/**
 * Verify a user has the proper permissions to edit an account
 *
 * @param array $acctinfo User account information for edited account
 *
 * @return bool True if permission to edit the account, otherwise false
 */
function can_edit_account($acctinfo) {
	if ($acctinfo['AccountType'] == 'Developer' ||
	    $acctinfo['AccountType'] == 'Trusted User & Developer') {
		return has_credential(CRED_ACCOUNT_EDIT_DEV);
	}

	$uid = $acctinfo['ID'];
	return has_credential(CRED_ACCOUNT_EDIT, array($uid));
}

/*
 * Compute the fingerprint of an SSH key.
 *
 * @param string $ssh_key The SSH public key to retrieve the fingerprint for
 *
 * @return string The SSH key fingerprint
 */
function ssh_key_fingerprint($ssh_key) {
	$tmpfile = tempnam(sys_get_temp_dir(), "aurweb");
	file_put_contents($tmpfile, $ssh_key);

	/*
	 * The -l option of ssh-keygen can be used to show the fingerprint of
	 * the specified public key file. Expected output format:
	 *
	 *     2048 SHA256:uBBTXmCNjI2CnLfkuz9sG8F+e9/T4C+qQQwLZWIODBY user@host (RSA)
	 *
	 * ... where 2048 is the key length, the second token is the actual
	 * fingerprint, followed by the key comment and the key type.
	 */

	$cmd = "/usr/bin/ssh-keygen -l -f " . escapeshellarg($tmpfile);
	exec($cmd, $out, $ret);
	if ($ret !== 0 || count($out) !== 1) {
		return false;
	}

	unlink($tmpfile);

	$tokens = explode(' ', $out[0]);
	if (count($tokens) < 4) {
		return false;
	}

	$tokens = explode(':', $tokens[1]);
	if (count($tokens) != 2 || $tokens[0] != 'SHA256') {
		return false;
	}

	return $tokens[1];
}

/*
 * Get the SSH public keys associated with an account.
 *
 * @param int $uid The user ID of the account to retrieve the keys for.
 *
 * @return array An array representing the keys
 */
function account_get_ssh_keys($uid) {
	$dbh = DB::connect();
	$q = "SELECT PubKey FROM SSHPubKeys WHERE UserID = " . intval($uid);
	$result = $dbh->query($q);

	if ($result) {
		return $result->fetchAll(PDO::FETCH_COLUMN, 0);
	} else {
		return array();
	}
}

/*
 * Set the SSH public keys associated with an account.
 *
 * @param int $uid The user ID of the account to assign the keys to.
 * @param array $ssh_keys The SSH public keys.
 * @param array $ssh_fingerprints The corresponding SSH key fingerprints.
 *
 * @return bool Boolean flag indicating success or failure.
 */
function account_set_ssh_keys($uid, $ssh_keys, $ssh_fingerprints) {
	$dbh = DB::connect();

	$q = sprintf("DELETE FROM SSHPubKeys WHERE UserID = %d", $uid);
	$dbh->exec($q);

	$ssh_fingerprint = reset($ssh_fingerprints);
	foreach ($ssh_keys as $ssh_key) {
		$q = sprintf(
			"INSERT INTO SSHPubKeys (UserID, Fingerprint, PubKey) " .
			"VALUES (%d, %s, %s)", $uid,
			$dbh->quote($ssh_fingerprint), $dbh->quote($ssh_key)
		);
		$dbh->exec($q);
		$ssh_fingerprint = next($ssh_fingerprints);
	}

	return true;
}

/*
 * Invoke the email notification script.
 *
 * @param string $params Command line parameters for the script.
 *
 * @return void
 */
function notify($params) {
	$cmd = config_get('notifications', 'notify-cmd');
	foreach ($params as $param) {
		$cmd .= ' ' . escapeshellarg($param);
	}

	$descspec = array(
		0 => array('pipe', 'r'),
		1 => array('pipe', 'w'),
		2 => array('pipe', 'w')
	);

	$p = proc_open($cmd, $descspec, $pipes);

	if (!is_resource($p)) {
		return false;
	}

	fclose($pipes[0]);
	fclose($pipes[1]);
	fclose($pipes[2]);

	return proc_close($p);
}