summaryrefslogtreecommitdiffstats
path: root/web/lib/acctfuncs.inc
blob: 5bcff8b58ff73ed983fa3c03441820eb724aa92f (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
<?php

# Helper function- retrieve request param if available, "" otherwise
function in_request($name) {
	if (isset($_REQUEST[$name])) {
		return $_REQUEST[$name];
	}
	return "";
}

# Display the standard Account form, pass in default values if any

function display_account_form($UTYPE,$A,$U="",$T="",$S="",
			$E="",$P="",$C="",$R="",$L="",$I="",$UID=0) {
	# UTYPE: what user type the form is being displayed for
	# A: what "form" name to use
	# U: value to display for username
	# T: value to display for account type
	# S: value to display for account suspended
	# E: value to display for email address
	# P: password value
	# C: confirm password value
	# R: value to display for RealName
	# L: value to display for Language preference
	# I: value to display for IRC nick
	# N: new package notify value
	# UID: Users.ID value in case form is used for editing

	global $SUPPORTED_LANGS;

	print "<form action='account.php' method='post'>\n";
	print "<fieldset>";
	print "<input type='hidden' name='Action' value='".$A."' />\n";
	if ($UID) {
		print "<input type='hidden' name='ID' value='".$UID."' />\n";
	}
	print "</fieldset>";
	print "<table border='0' cellpadding='0' cellspacing='0' width='80%' style=\"margin:0 auto;\">\n";
	print "<tr><td colspan='2'>&nbsp;</td></tr>\n";

	print "<tr>";
	print "<td align='left'>".__("Username").":</td>";
	print "<td align='left'><input type='text' size='30' maxlength='64'";
	print " name='U' value='".htmlspecialchars($U,ENT_QUOTES)."' /> (".__("required").")</td>";
	print "</tr>\n";

	# Only TUs or Devs can promote/demote/suspend a user
	if ($UTYPE == "Trusted User" || $UTYPE == "Developer") {
		print "<tr>";
		print "<td align='left'>".__("Account Type").":</td>";
		print "<td align='left'><select name=T>\n";
		print "<option value='1'";
		$T == "User" ? print " selected>" : print ">";
		print __("Normal user")."\n";
		print "<option value='2'";
		$T == "Trusted User" ? print " selected>" : print ">";
		print __("Trusted user")."\n";

		# Only developers can make another account a developer
		if ($UTYPE == "Developer") {
			print "<option value='3'";
			$T == "Developer" ? print " selected>" : print ">";
			print __("Developer")."\n";
		}
		print "</select></td>";
		print "</tr>\n";

		print "<tr>";
		print "<td align='left'>".__("Account Suspended").":</td>";
		print "<td align='left'><input type='checkbox' name='S'";
		if ($S) {
			print " checked=\"checked\" />";
		} else {
			print " />";
		}
		print "</tr>\n";
	}

	print "<tr>";
	print "<td align='left'>".__("Email Address").":</td>";
	print "<td align='left'><input type='text' size='30' maxlength='64'";
	print " name='E' value='".htmlspecialchars($E,ENT_QUOTES)."' /> (".__("required").")</td>";
	print "</tr>\n";

	print "<tr>";
	print "<td align='left'>".__("Password").":</td>";
	print "<td align='left'><input type='password' size='30' maxlength='32'";
	print " name='P' value='".$P."' />";
	if ($A != "UpdateAccount") {
		print " (".__("required").")";
	}
	print "</td></tr>\n";

	print "<tr>";
	print "<td align='left'>".__("Re-type password").":</td>";
	print "<td align='left'><input type='password' size='30' maxlength='32'";
	print " name='C' value='".$C."' />";
	if ($A != "UpdateAccount") {
		print " (".__("required").")";
	}
	print "</td></tr>\n";

	print "<tr>";
	print "<td align='left'>".__("Real Name").":</td>";
	print "<td align='left'><input type='text' size='30' maxlength='32'";
	print " name='R' value='".htmlspecialchars($R,ENT_QUOTES)."' /></td>";
	print "</tr>\n";

	print "<tr>";
	print "<td align='left'>".__("IRC Nick").":</td>";
	print "<td align='left'><input type='text' size='30' maxlength='32'";
	print " name='I' value='".htmlspecialchars($I,ENT_QUOTES)."' /></td>";
	print "</tr>\n";

	print "<tr>";
	print "<td align='left'>".__("Language").":</td>";
	print "<td align='left'><select name=L>\n";

	reset($SUPPORTED_LANGS);
	while (list($code, $lang) = each($SUPPORTED_LANGS)) {
		if ($L == $code) {
			print "<option value=".$code." selected> ".$lang."\n";
		} else {
			print "<option value=".$code."> ".$lang."\n";
		}
	}
	print "</select></td>";
	print "</tr>\n";

	print "<tr><td colspan='2'>&nbsp;</td></tr>\n";
	print "<tr>";
	print "<td>&nbsp;</td>";
	print "<td align='left'>";

	if ($A == "UpdateAccount") {
		print "<input type='submit' class='button'";
		print " value='".__("Update")."' /> &nbsp; ";
	} else {
		print "<input type='submit' class='button'";
		print " value='".__("Create")."' /> &nbsp; ";
	}
	print "<input type='reset' class='button' value='".__("Reset")."' />";
	print "</td>";
	print "</tr>\n";

	print "</table>\n";
	print "</form>\n";
	return;
} # function display_account_form()


# process form input from a new/edit account form
#
function process_account_form($UTYPE,$TYPE,$A,$U="",$T="",$S="",$E="",
			$P="",$C="",$R="",$L="",$I="",$UID=0) {
	# UTYPE: The user's account type
	# TYPE: either "edit" or "new"
	# A: what parent "form" name to use
	# U: value to display for username
	# T: value to display for account type
	# S: value to display for account suspended
	# E: value to display for email address
	# P: password value
	# C: confirm password value
	# R: value to display for RealName
	# L: value to display for Language preference
	# I: value to display for IRC nick
	# N: new package notify value
	# UID: database Users.ID value

	# error check and process request for a new/modified account
	global $SUPPORTED_LANGS;

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

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

	if ($TYPE == "new") {
		# they need password fields for this type of action
		#
		if (empty($P) || empty($C)) {
			$error = __("Missing a required field.");
		}
	} else {
		if (!$UID) {
			$error = __("Missing User ID");
		}
	}

  if (!$error && !valid_username($U) && !user_is_privileged($editor_user))
	$error = __("The username is invalid.") . "<ul>\n"
			."<li>" . __("It must be between %s and %s characters long",
			USERNAME_MIN_LEN,  USERNAME_MAX_LEN )
			. "</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))
		$error = __("Your password must be at least %s characters.",PASSWD_MIN_LEN);

	if (!$error && !valid_email($E)) {
		$error = __("The email address is invalid.");
	}
	if ($UTYPE == "Trusted User" && $T == 3) {
		$error = __("A Trusted User cannot assign Developer status.");
	}
	if (!$error && !array_key_exists($L, $SUPPORTED_LANGS)) {
		$error = __("Language is not currently supported.");
	}
	if (!$error) {
		# check to see if this username is available
		# NOTE: a race condition exists here if we care...
		#
		$q = "SELECT COUNT(*) AS CNT FROM Users ";
		$q.= "WHERE Username = '".mysql_real_escape_string($U)."'";
		if ($TYPE == "edit") {
			$q.= " AND ID != ".intval($UID);
		}
		$result = db_query($q, $dbh);
		if ($result) {
			$row = mysql_fetch_array($result);
			if ($row[0]) {
				$error = __("The username, %h%s%h, is already in use.",
					"<b>", htmlspecialchars($U,ENT_QUOTES), "</b>");
			}
		}
	}
	if (!$error) {
		# check to see if this email address is available
		# NOTE: a race condition exists here if we care...
		#
		$q = "SELECT COUNT(*) AS CNT FROM Users ";
		$q.= "WHERE Email = '".mysql_real_escape_string($E)."'";
		if ($TYPE == "edit") {
			$q.= " AND ID != ".intval($UID);
		}
		$result = db_query($q, $dbh);
		if ($result) {
			$row = mysql_fetch_array($result);
			if ($row[0]) {
				$error = __("The address, %h%s%h, is already in use.",
						"<b>", htmlspecialchars($E,ENT_QUOTES), "</b>");
			}
		}
	}
	if ($error) {
		print "<span class='error'>".$error."</span><br/>\n";
		display_account_form($UTYPE, $A, $U, $T, $S, $E, "", "",
				$R, $L, $I, $UID);
	} else {
		if ($TYPE == "new") {
			# no errors, go ahead and create the unprivileged user
			$salt = generate_salt();
			$P = salted_hash($P, $salt);
			$escaped = array_map('mysql_real_escape_string',
				array($U, $E, $P, $salt, $R, $L, $I));
			$q = "INSERT INTO Users (" .
				"AccountTypeID, Suspended, Username, Email, Passwd, Salt" .
				", RealName, LangPreference, IRCNick) " .
				"VALUES (1, 0, '" . implode("', '", $escaped) . "')";
			$result = db_query($q, $dbh);
			if (!$result) {
				print __("Error trying to create account, %h%s%h: %s.",
						"<b>", htmlspecialchars($U,ENT_QUOTES), "</b>", mysql_error($dbh));
			} else {
				# account created/modified, tell them so.
				#
				print __("The account, %h%s%h, has been successfully created.",
						"<b>", htmlspecialchars($U,ENT_QUOTES), "</b>");
				print "<p>\n";
				print __("Click on the Home link above to login.");
				print "</p>\n";
			}

		} else {
			# no errors, go ahead and modify the user account

			$q = "UPDATE Users SET ";
			$q.= "Username = '".mysql_real_escape_string($U)."'";
			if ($T) {
				$q.= ", AccountTypeID = ".intval($T);
			}
			if ($S) {
				$q.= ", Suspended = 1";
			} else {
				$q.= ", Suspended = 0";
			}
			$q.= ", Email = '".mysql_real_escape_string($E)."'";
			if ($P) {
				$salt = generate_salt();
				$hash = salted_hash($P, $salt);
				$q .= ", Passwd = '$hash', Salt = '$salt'";
			}
			$q.= ", RealName = '".mysql_real_escape_string($R)."'";
			$q.= ", LangPreference = '".mysql_real_escape_string($L)."'";
			$q.= ", IRCNick = '".mysql_real_escape_string($I)."'";
			$q.= " WHERE ID = ".intval($UID);
			$result = db_query($q, $dbh);
			if (!$result) {
				print __("Error trying to modify account, %h%s%h: %s.",
						"<b>", htmlspecialchars($U,ENT_QUOTES), "</b>", mysql_error($dbh));
			} else {
				print __("The account, %h%s%h, has been successfully modified.",
						"<b>", htmlspecialchars($U,ENT_QUOTES), "</b>");
			}
		}
	}
	return;
}

# search existing accounts
#
function search_accounts_form() {
	include("search_accounts_form.php");
	return;
}


# search results page
#
function search_results_page($UTYPE,$O=0,$SB="",$U="",$T="",
		$S="",$E="",$R="",$I="") {
	# UTYPE: what account type the user belongs to
	# O: what row offset we're at
	# SB: how to sort the results
	# U: value to display for username
	# T: value to display for account type
	# S: value to display for account suspended
	# E: value to display for email address
	# R: value to display for RealName
	# I: value to display for IRC nick

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

	$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 ";
		$search_vars[] = "T";
	}
	if ($S) {
		$q.= "AND Users.Suspended = 1 ";
		$search_vars[] = "S";
	}
	if ($U) {
		$q.= "AND Username LIKE '%".mysql_real_escape_string($U)."%' ";
		$search_vars[] = "U";
	}
	if ($E) {
		$q.= "AND Email LIKE '%".mysql_real_escape_string($E)."%' ";
		$search_vars[] = "E";
	}
	if ($R) {
		$q.= "AND RealName LIKE '%".mysql_real_escape_string($R)."%' ";
		$search_vars[] = "R";
	}
	if ($I) {
		$q.= "AND IRCNick LIKE '%".mysql_real_escape_string($I)."%' ";
		$search_vars[] = "I";
	}
	switch ($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;
		case 'v':
			$q.= "ORDER BY LastVoted, Username ";
			break;
		default:
			$q.= "ORDER BY Username, AccountTypeID ";
			break;
	}
	$search_vars[] = "SB";
	$q.= "LIMIT " . $HITS_PER_PAGE . " OFFSET " . $OFFSET;

	$dbh = db_connect();

	$result = db_query($q, $dbh);
	if (!$result) {
		print __("No results matched your search criteria.");
	} else {
		$num_rows = mysql_num_rows($result);
		if ($num_rows) {
			print "<table border='0' cellpadding='0'";
			print " cellspacing='0' width='90%'";
			print " style=\"margin:0 auto\">\n";
			print "<tr>";
			print "<td colspan='2'>";
			print "<table border='0' cellpadding='0'";
			print " cellspacing='0' width='100%'>\n";
			print "<tr>";
			print "<th class='header'>";
			print "<span class='f2'>".__("Username")."</span></th>";
			print "<th class='header'>";
			print "<span class='f2'>".__("Type")."</span></th>";
			print "<th class='header'>";
			print "<span class='f2'>".__("Status")."</span></th>";
			print "<th class='header'>";
			print "<span class='f2'>".__("Real Name")."</span></th>";
			print "<th class='header'>";
			print "<span class='f2'>".__("IRC Nick")."</span></th>";
			print "<th class='header'>";
			print "<span class='f2'>".__("Last Voted")."</span></th>";
			print "<th class='header'>";
			print "<span class='f2'>".__("Edit Account")."</span></th>";
			print "</tr>\n";
			$i = 0;
			while ($row = mysql_fetch_assoc($result)) {
				if ($i % 2) {
					$c = "data1";
				} else {
					$c = "data2";
				}
				print "<tr>";
				print "<td class='".$c."'>";
				print "<span class='f5'><a href='packages.php?SeB=m&amp;K=".$row["Username"]."'>".$row["Username"]."</a></span></td>";
				print "<td class='".$c."'>";
				print "<span class='f5'>".$row["AccountType"];
				print "</span></td>";
				print "<td class='".$c."'><span class='f5'>";
				if ($row["Suspended"]) {
					print __("Suspended");
				} else {
					print __("Active");
				}
				print "</span></td>";
				print "<td class='".$c."'><span class='f5'>";
				$row["RealName"] ? print htmlspecialchars($row["RealName"],ENT_QUOTES) : print "&nbsp;";
				print "</span></td>";
				print "<td class='".$c."'><span class='f5'>";
				$row["IRCNick"] ? print htmlspecialchars($row["IRCNick"],ENT_QUOTES) : print "&nbsp;";
				print "</span></td>";
				print "<td class='".$c."'><span class='f5'>";
				$row["LastVoted"]
						? print date("Ymd", $row["LastVoted"])
						: print __("Never");
				print "</span></td>";
				print "<td class='".$c."'><span class='f5'>";
				if ($UTYPE == "Trusted User" && $row["AccountType"] == "Developer") {
					# TUs can't edit devs
					#
					print "&nbsp;</span></td>";
				} else {
					$edit_url = "account.php?Action=DisplayAccount&amp;ID=".$row["ID"];
					print "<a href='".$edit_url . "'>";
					print "Edit</a></span></td>";
				}
				print "</tr>\n";
				$i++;
			}
			print "</table>\n";
			print "</td></tr>\n";

			print "<tr>";
			print "<td align='left'>";
			print "<form action='account.php' method='post'>\n";
			print "<fieldset>";
			print "<input type='hidden' name='Action' value='SearchAccounts' />\n";
			print "<input type='hidden' name='O'";
			print " value='".($OFFSET-$HITS_PER_PAGE)."' />\n";
			reset($search_vars);
			while (list($k, $ind) = each($search_vars)) {
				print "<input type='hidden' name='".$ind."'";
				print " value='".${$ind}."' />\n";
			}
			print "<input type='submit' class='button'";
			print " value='&lt;-- ".__("Less")."' />";
			print "</fieldset>";
			print "</form>\n";
			print "</td>";
			print "<td align='right'>";
			print "<form action='account.php' method='post'>\n";
			print "<fieldset>";
			print "<input type='hidden' name='Action' value='SearchAccounts' />\n";
			print "<input type='hidden' name='O'";
			print " value='".($OFFSET+$HITS_PER_PAGE)."' />\n";
			reset($search_vars);
			while (list($k, $ind) = each($search_vars)) {
				print "<input type='hidden' name='".$ind."'";
				print " value='".${$ind}."' />\n";
			}
			print "<input type='submit' class='button'";
			print " value='".__("More")." --&gt;' />";
			print "</fieldset>";
			print "</form>\n";
			print "</td>";
			print "</tr>\n";
			print "</table>\n";
		} else {
			print "<p style=\"text-align:center;\">\n";
			print __("No more results to display.");
			print "</p>\n";
		}
	}
	return;
}

# Display non-editable account info
#
function display_account_info($U="", $T="", $E="", $R="", $I="") {
	# U: value to display for username
	# T: value to display for account type
	# E: value to display for email address
	# R: value to display for RealName
	# I: value to display for IRC nick

	global $SUPPORTED_LANGS;

	print "<table border='0' cellpadding='0' cellspacing='0' width='33%' style=\"margin:0 auto;\">\n";
	print "  <tr>\n";
	print "    <td colspan='2'>&nbsp;</td>\n";
	print "  </tr>\n";

	print "  <tr>\n";
	print "    <td align='left'>".__("Username").":</td>\n";
	print "    <td align='left'>".$U."</td>\n";
	print "  </tr>\n";

	print "  <tr>\n";
	print "    <td align='left'>".__("Account Type").":</td>\n";
	print "    <td align='left'>";
	if ($T == "User") {
		print __("User");
	} elseif ($T == "Trusted User") {
		print __("Trusted User");
	} elseif ($T == "Developer") {
		print __("Developer");
	}
	print "    </td>\n";
	print "  </tr>\n";

	print "  <tr>\n";
	print "    <td align='left'>".__("Email Address").":</td>\n";
	print "    <td align='left'><a href='mailto:".htmlspecialchars($E,ENT_QUOTES)."'>".htmlspecialchars($E,ENT_QUOTES)."</a></td>\n";
	print "  </tr>\n";

	print "  <tr>\n";
	print "    <td align='left'>".__("Real Name").":</td>\n";
	print "    <td align='left'>".htmlspecialchars($R,ENT_QUOTES)."</td>\n";
	print "  </tr>\n";

	print "  <tr>\n";
	print "    <td align='left'>".__("IRC Nick").":</td>\n";
	print "    <td align='left'>".htmlspecialchars($I,ENT_QUOTES)."</td>\n";
	print "  </tr>\n";

	print "  <tr>\n";
	print "    <td colspan='2'><a href='packages.php?K=".$U."&amp;SeB=m'>".__("View this user's packages")."</a></td>\n";
	print "  </tr>\n";

	print "</table>\n";
	return;
}

/*
 * Returns SID (Session ID) and error (error message) in an array
 * SID of 0 means login failed.
 */
function try_login() {
	global $MAX_SESSIONS_PER_USER, $PERSISTENT_COOKIE_TIMEOUT;

	$login_error = "";
	$new_sid = "";
	$userID = null;

	if ( isset($_REQUEST['user']) || isset($_REQUEST['passwd']) ) {

		$userID = valid_user($_REQUEST['user']);

		if ( user_suspended( $userID ) ) {
			$login_error = "Account Suspended.";
		}
		elseif ( $userID && isset($_REQUEST['passwd'])
		  && valid_passwd($userID, $_REQUEST['passwd']) ) {

			$logged_in = 0;
			$num_tries = 0;

			# Account looks good.  Generate a SID and store it.

			$dbh = db_connect();
			while (!$logged_in && $num_tries < 5) {
				if ($MAX_SESSIONS_PER_USER) {
					# Delete all user sessions except the
					# last ($MAX_SESSIONS_PER_USER - 1).
					$q = "DELETE s.* FROM Sessions s ";
					$q.= "LEFT JOIN (SELECT SessionID FROM Sessions ";
					$q.= "WHERE UsersId = " . $userID . " ";
					$q.= "ORDER BY LastUpdateTS DESC ";
					$q.= "LIMIT " . ($MAX_SESSIONS_PER_USER - 1) . ") q ";
					$q.= "ON s.SessionID = q.SessionID ";
					$q.= "WHERE s.UsersId = " . $userID . " ";
					$q.= "AND q.SessionID IS NULL;";
					db_query($q, $dbh);
				}

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

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

				$num_tries++;
			}

			if ($logged_in) {
				# set our SID cookie

				if (isset($_POST['remember_me']) &&
					$_POST['remember_me'] == "on") {
					# Set cookies for 30 days.
					$cookie_time = time() + $PERSISTENT_COOKIE_TIMEOUT;

					# Set session for 30 days.
					$q = "UPDATE Sessions SET LastUpdateTS = $cookie_time ";
					$q.= "WHERE SessionID = '$new_sid'";
					db_query($q, $dbh);
				}
				else
					$cookie_time = 0;

				setcookie("AURSID", $new_sid, $cookie_time, "/");
				header("Location: " . $_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING']);
				$login_error = "";

			}
			else {
				$login_error = "Error trying to generate session id.";
			}
		}
		else {
			$login_error = __("Bad username or password.");
		}
	}
	return array('SID' => $new_sid, 'error' => $login_error);
}

/*
 * Only checks if the name itself is valid
 * Longer or equal to USERNAME_MIN_LEN
 * Shorter or equal to USERNAME_MAX_LEN
 * Starts and ends with a letter or number
 * Contains at most ONE dot, hyphen, or underscore
 * Returns the username if it is valid
 * Returns nothing if it isn't valid
 */
function valid_username( $user )
{
	if (!empty($user)) {

		#Is username at not too short or too long?
		if ( strlen($user) >= USERNAME_MIN_LEN &&
		  strlen($user) <= USERNAME_MAX_LEN ) {

			$user = strtolower($user);
			# Does username:
			# start and end with a letter or number
			# contain only letters and numbers,
			#  and at most has one dash, period, or underscore
			if ( preg_match("/^[a-z0-9]+[.\-_]?[a-z0-9]+$/", $user) ) {
				#All is good return the username
				return $user;
			}
		}
	}

	return;
}

/*
 * Checks if the username is valid and if it exists in the database
 * Returns the username ID or nothing
 */
function valid_user( $user )
{
	/*	if ( $user = valid_username($user) ) { */
	if ( $user ) {
		$dbh = db_connect();
		$q = "SELECT ID FROM Users WHERE Username = '"
			. mysql_real_escape_string($user). "'";

		$result = db_query($q, $dbh);
		# Is the username in the database?
		if ($result) {
			$row = mysql_fetch_row($result);
			return $row[0];
		}
	}
	return;
}

function good_passwd( $passwd )
{
	if ( strlen($passwd) >= PASSWD_MIN_LEN ) {
		return true;
	}
	return false;
}

/* Verifies that the password is correct for the userID specified.
 * Returns true or false
 */
function valid_passwd( $userID, $passwd )
{
	if ( strlen($passwd) > 0 ) {
		$dbh = db_connect();

		# get salt for this user
		$salt = get_salt($userID);
		if ($salt) {
			# use salt
			$passwd_q = "SELECT ID FROM Users" .
				" WHERE ID = " . $userID  . " AND Passwd = '" .
				salted_hash($passwd, $salt) . "'";
			$result = db_query($passwd_q, $dbh);
			if ($result) {
				$passwd_result = mysql_fetch_row($result);
				if ($passwd_result[0]) {
					return true;
				}
			}
		} else {
			# check without salt
			$nosalt_q = "SELECT ID FROM Users".
				" WHERE ID = " . $userID .
				" AND Passwd = '" . md5($passwd) . "'";
			$result = db_query($nosalt_q, $dbh);
			if ($result) {
				$nosalt_row = mysql_fetch_row($result);
				if ($nosalt_row[0]) {
					# password correct, but salt it first
					if (!save_salt($userID, $passwd)) {
						trigger_error("Unable to salt user's password;" .
							" ID " . $userID, E_USER_WARNING);
						return false;
					}
					return true;
				}
			}
		}
	}
	return false;
}

/*
 * Is the user account suspended?
 */
function user_suspended( $id )
{
	$dbh = db_connect();
	$q = "SELECT Suspended FROM Users WHERE ID = " . $id;
	$result = db_query($q, $dbh);
	if ($result) {
		$row = mysql_fetch_row($result);
		if ($result[0] == 1 ) {
			return true;
		}
	}
	return false;
}

/*
 * This should be expanded to return something
 */
function user_delete( $id )
{
	$dbh = db_connect();
	$q = "DELETE FROM Users WHERE ID = " . $id;
	db_query($q, $dbh);
	return;
}

/*
 * A different way of determining a user's privileges
 * rather than account_from_sid()
 */
function user_is_privileged( $id )
{
	$dbh = db_connect();
	$q = "SELECT AccountTypeID FROM Users WHERE ID = " . $id;
	$result = db_query($q, $dbh);
	if ($result) {
		$row = mysql_fetch_row($result);
		if( $result[0] > 1) {
			return $result[0];
		}
	}
	return 0;

}

# Clear out old expired sessions.
function clear_expired_sessions($dbh = null) {
	global $LOGIN_TIMEOUT;

	if (empty($dbh)) {
		$dbh = db_connect();
	}

	$q = "DELETE FROM Sessions WHERE LastUpdateTS < (UNIX_TIMESTAMP() - $LOGIN_TIMEOUT)";
	db_query($q, $dbh);

	return;
}