summaryrefslogtreecommitdiff
path: root/source3/passdb/pdb_smbpasswd.c
blob: 8d6ac318cb751ee3344166e921d2c42434d000c3 (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
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
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
/*
 * Unix SMB/CIFS implementation. 
 * SMB parameters and setup
 * Copyright (C) Andrew Tridgell       1992-1998 
 * Modified by Jeremy Allison          1995.
 * Modified by Gerald (Jerry) Carter   2000-2001,2003
 * Modified by Andrew Bartlett         2002.
 * 
 * This program 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.
 * 
 * This program 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
 * this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "includes.h"
#include "../librpc/gen_ndr/samr.h"
#include "../libcli/security/security.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB

/* 
   smb_passwd is analogous to sam_passwd used everywhere
   else.  However, smb_passwd is limited to the information
   stored by an smbpasswd entry 
 */

struct smb_passwd
{
        uint32 smb_userid;        /* this is actually the unix uid_t */
        const char *smb_name;     /* username string */

        const unsigned char *smb_passwd;    /* Null if no password */
        const unsigned char *smb_nt_passwd; /* Null if no password */

        uint16_t acct_ctrl;             /* account info (ACB_xxxx bit-mask) */
        time_t pass_last_set_time;    /* password last set time */
};

struct smbpasswd_privates
{
	/* used for maintain locks on the smbpasswd file */
	int 	pw_file_lock_depth;

	/* Global File pointer */
	FILE 	*pw_file;

	/* formerly static variables */
	struct smb_passwd pw_buf;
	fstring user_name;
	unsigned char smbpwd[16];
	unsigned char smbntpwd[16];

	/* retrive-once info */
	const char *smbpasswd_file;
};

enum pwf_access_type { PWF_READ, PWF_UPDATE, PWF_CREATE };

static SIG_ATOMIC_T gotalarm;

/***************************************************************
 Signal function to tell us we timed out.
****************************************************************/

static void gotalarm_sig(int signum)
{
	gotalarm = 1;
}

/***************************************************************
 Lock or unlock a fd for a known lock type. Abandon after waitsecs 
 seconds.
****************************************************************/

static bool do_file_lock(int fd, int waitsecs, int type)
{
	SMB_STRUCT_FLOCK lock;
	int             ret;
	void (*oldsig_handler)(int);

	gotalarm = 0;
	oldsig_handler = CatchSignal(SIGALRM, gotalarm_sig);

	lock.l_type = type;
	lock.l_whence = SEEK_SET;
	lock.l_start = 0;
	lock.l_len = 1;
	lock.l_pid = 0;

	alarm(waitsecs);
	/* Note we must *NOT* use sys_fcntl here ! JRA */
	ret = fcntl(fd, SMB_F_SETLKW, &lock);
	alarm(0);
	CatchSignal(SIGALRM, oldsig_handler);

	if (gotalarm && ret == -1) {
		DEBUG(0, ("do_file_lock: failed to %s file.\n",
			type == F_UNLCK ? "unlock" : "lock"));
		return False;
	}

	return (ret == 0);
}

/***************************************************************
 Lock an fd. Abandon after waitsecs seconds.
****************************************************************/

static bool pw_file_lock(int fd, int type, int secs, int *plock_depth)
{
	if (fd < 0) {
		return False;
	}

	if(*plock_depth == 0) {
		if (!do_file_lock(fd, secs, type)) {
			DEBUG(10,("pw_file_lock: locking file failed, error = %s.\n",
				strerror(errno)));
			return False;
		}
	}

	(*plock_depth)++;

	return True;
}

/***************************************************************
 Unlock an fd. Abandon after waitsecs seconds.
****************************************************************/

static bool pw_file_unlock(int fd, int *plock_depth)
{
	bool ret=True;

	if (fd == 0 || *plock_depth == 0) {
		return True;
	}

	if(*plock_depth == 1) {
		ret = do_file_lock(fd, 5, F_UNLCK);
	}

	if (*plock_depth > 0) {
		(*plock_depth)--;
	}

	if(!ret) {
		DEBUG(10,("pw_file_unlock: unlocking file failed, error = %s.\n",
			strerror(errno)));
	}
	return ret;
}

/**************************************************************
 Intialize a smb_passwd struct
 *************************************************************/

static void pdb_init_smb(struct smb_passwd *user)
{
	if (user == NULL) 
		return;
	ZERO_STRUCTP (user);

	user->pass_last_set_time = (time_t)0;
}

/***************************************************************
 Internal fn to enumerate the smbpasswd list. Returns a void pointer
 to ensure no modification outside this module. Checks for atomic
 rename of smbpasswd file on update or create once the lock has
 been granted to prevent race conditions. JRA.
****************************************************************/

static FILE *startsmbfilepwent(const char *pfile, enum pwf_access_type type, int *lock_depth)
{
	FILE *fp = NULL;
	const char *open_mode = NULL;
	int race_loop = 0;
	int lock_type = F_RDLCK;

	if (!*pfile) {
		DEBUG(0, ("startsmbfilepwent: No SMB password file set\n"));
		return (NULL);
	}

	switch(type) {
		case PWF_READ:
			open_mode = "rb";
			lock_type = F_RDLCK;
			break;
		case PWF_UPDATE:
			open_mode = "r+b";
			lock_type = F_WRLCK;
			break;
		case PWF_CREATE:
			/*
			 * Ensure atomic file creation.
			 */
			{
				int i, fd = -1;

				for(i = 0; i < 5; i++) {
					if((fd = sys_open(pfile, O_CREAT|O_TRUNC|O_EXCL|O_RDWR, 0600))!=-1) {
						break;
					}
					sys_usleep(200); /* Spin, spin... */
				}
				if(fd == -1) {
					DEBUG(0,("startsmbfilepwent_internal: too many race conditions \
creating file %s\n", pfile));
					return NULL;
				}
				close(fd);
				open_mode = "r+b";
				lock_type = F_WRLCK;
				break;
			}
	}

	for(race_loop = 0; race_loop < 5; race_loop++) {
		DEBUG(10, ("startsmbfilepwent_internal: opening file %s\n", pfile));

		if((fp = sys_fopen(pfile, open_mode)) == NULL) {

			/*
			 * If smbpasswd file doesn't exist, then create new one. This helps to avoid
			 * confusing error msg when adding user account first time.
			 */
			if (errno == ENOENT) {
				if ((fp = sys_fopen(pfile, "a+")) != NULL) {
					DEBUG(0, ("startsmbfilepwent_internal: file %s did not \
exist. File successfully created.\n", pfile));
				} else {
					DEBUG(0, ("startsmbfilepwent_internal: file %s did not \
exist. Couldn't create new one. Error was: %s",
					pfile, strerror(errno)));
					return NULL;
				}
			} else {
				DEBUG(0, ("startsmbfilepwent_internal: unable to open file %s. \
Error was: %s\n", pfile, strerror(errno)));
				return NULL;
			}
		}

		if (!pw_file_lock(fileno(fp), lock_type, 5, lock_depth)) {
			DEBUG(0, ("startsmbfilepwent_internal: unable to lock file %s. \
Error was %s\n", pfile, strerror(errno) ));
			fclose(fp);
			return NULL;
		}

		/*
		 * Only check for replacement races on update or create.
		 * For read we don't mind if the data is one record out of date.
		 */

		if(type == PWF_READ) {
			break;
		} else {
			SMB_STRUCT_STAT sbuf1, sbuf2;

			/*
			 * Avoid the potential race condition between the open and the lock
			 * by doing a stat on the filename and an fstat on the fd. If the
			 * two inodes differ then someone did a rename between the open and
			 * the lock. Back off and try the open again. Only do this 5 times to
			 * prevent infinate loops. JRA.
			 */

			if (sys_stat(pfile, &sbuf1, false) != 0) {
				DEBUG(0, ("startsmbfilepwent_internal: unable to stat file %s. \
Error was %s\n", pfile, strerror(errno)));
				pw_file_unlock(fileno(fp), lock_depth);
				fclose(fp);
				return NULL;
			}

			if (sys_fstat(fileno(fp), &sbuf2, false) != 0) {
				DEBUG(0, ("startsmbfilepwent_internal: unable to fstat file %s. \
Error was %s\n", pfile, strerror(errno)));
				pw_file_unlock(fileno(fp), lock_depth);
				fclose(fp);
				return NULL;
			}

			if( sbuf1.st_ex_ino == sbuf2.st_ex_ino) {
				/* No race. */
				break;
			}

			/*
			 * Race occurred - back off and try again...
			 */

			pw_file_unlock(fileno(fp), lock_depth);
			fclose(fp);
		}
	}

	if(race_loop == 5) {
		DEBUG(0, ("startsmbfilepwent_internal: too many race conditions opening file %s\n", pfile));
		return NULL;
	}

	/* Set a buffer to do more efficient reads */
	setvbuf(fp, (char *)NULL, _IOFBF, 1024);

	/* Make sure it is only rw by the owner */
#ifdef HAVE_FCHMOD
	if(fchmod(fileno(fp), S_IRUSR|S_IWUSR) == -1) {
#else
	if(chmod(pfile, S_IRUSR|S_IWUSR) == -1) {
#endif
		DEBUG(0, ("startsmbfilepwent_internal: failed to set 0600 permissions on password file %s. \
Error was %s\n.", pfile, strerror(errno) ));
		pw_file_unlock(fileno(fp), lock_depth);
		fclose(fp);
		return NULL;
	}

	/* We have a lock on the file. */
	return fp;
}

/***************************************************************
 End enumeration of the smbpasswd list.
****************************************************************/

static void endsmbfilepwent(FILE *fp, int *lock_depth)
{
	if (!fp) {
		return;
	}

	pw_file_unlock(fileno(fp), lock_depth);
	fclose(fp);
	DEBUG(7, ("endsmbfilepwent_internal: closed password file.\n"));
}

/*************************************************************************
 Routine to return the next entry in the smbpasswd list.
 *************************************************************************/

static struct smb_passwd *getsmbfilepwent(struct smbpasswd_privates *smbpasswd_state, FILE *fp)
{
	/* Static buffers we will return. */
	struct smb_passwd *pw_buf = &smbpasswd_state->pw_buf;
	char  *user_name = smbpasswd_state->user_name;
	unsigned char *smbpwd = smbpasswd_state->smbpwd;
	unsigned char *smbntpwd = smbpasswd_state->smbntpwd;
	char linebuf[256];
	int c;
	unsigned char *p;
	long uidval;
	size_t linebuf_len;
	char *status;

	if(fp == NULL) {
		DEBUG(0,("getsmbfilepwent: Bad password file pointer.\n"));
		return NULL;
	}

	pdb_init_smb(pw_buf);
	pw_buf->acct_ctrl = ACB_NORMAL;  

	/*
	 * Scan the file, a line at a time and check if the name matches.
	 */
	status = linebuf;
	while (status && !feof(fp)) {
		linebuf[0] = '\0';

		status = fgets(linebuf, 256, fp);
		if (status == NULL && ferror(fp)) {
			return NULL;
		}

		/*
		 * Check if the string is terminated with a newline - if not
		 * then we must keep reading and discard until we get one.
		 */
		if ((linebuf_len = strlen(linebuf)) == 0) {
			continue;
		}

		if (linebuf[linebuf_len - 1] != '\n') {
			c = '\0';
			while (!ferror(fp) && !feof(fp)) {
				c = fgetc(fp);
				if (c == '\n') {
					break;
				}
			}
		} else {
			linebuf[linebuf_len - 1] = '\0';
		}

#ifdef DEBUG_PASSWORD
		DEBUG(100, ("getsmbfilepwent: got line |%s|\n", linebuf));
#endif
		if ((linebuf[0] == 0) && feof(fp)) {
			DEBUG(4, ("getsmbfilepwent: end of file reached\n"));
			break;
		}

		/*
		 * The line we have should be of the form :-
		 * 
		 * username:uid:32hex bytes:[Account type]:LCT-12345678....other flags presently
		 * ignored....
		 * 
		 * or,
		 *
		 * username:uid:32hex bytes:32hex bytes:[Account type]:LCT-12345678....ignored....
		 *
		 * if Windows NT compatible passwords are also present.
		 * [Account type] is an ascii encoding of the type of account.
		 * LCT-(8 hex digits) is the time_t value of the last change time.
		 */

		if (linebuf[0] == '#' || linebuf[0] == '\0') {
			DEBUG(6, ("getsmbfilepwent: skipping comment or blank line\n"));
			continue;
		}
		p = (unsigned char *) strchr_m(linebuf, ':');
		if (p == NULL) {
			DEBUG(0, ("getsmbfilepwent: malformed password entry (no :)\n"));
			continue;
		}

		strncpy(user_name, linebuf, PTR_DIFF(p, linebuf));
		user_name[PTR_DIFF(p, linebuf)] = '\0';

		/* Get smb uid. */

		p++; /* Go past ':' */

		if(*p == '-') {
			DEBUG(0, ("getsmbfilepwent: user name %s has a negative uid.\n", user_name));
			continue;
		}

		if (!isdigit(*p)) {
			DEBUG(0, ("getsmbfilepwent: malformed password entry for user %s (uid not number)\n",
				user_name));
			continue;
		}

		uidval = atoi((char *) p);

		while (*p && isdigit(*p)) {
			p++;
		}

		if (*p != ':') {
			DEBUG(0, ("getsmbfilepwent: malformed password entry for user %s (no : after uid)\n",
				user_name));
			continue;
		}

		pw_buf->smb_name = user_name;
		pw_buf->smb_userid = uidval;

		/*
		 * Now get the password value - this should be 32 hex digits
		 * which are the ascii representations of a 16 byte string.
		 * Get two at a time and put them into the password.
		 */

		/* Skip the ':' */
		p++;

		if (linebuf_len < (PTR_DIFF(p, linebuf) + 33)) {
			DEBUG(0, ("getsmbfilepwent: malformed password entry for user %s (passwd too short)\n",
				user_name ));
			continue;
		}

		if (p[32] != ':') {
			DEBUG(0, ("getsmbfilepwent: malformed password entry for user %s (no terminating :)\n",
				user_name));
			continue;
		}

		if (strnequal((char *) p, "NO PASSWORD", 11)) {
			pw_buf->smb_passwd = NULL;
			pw_buf->acct_ctrl |= ACB_PWNOTREQ;
		} else {
			if (*p == '*' || *p == 'X') {
				/* NULL LM password */
				pw_buf->smb_passwd = NULL;
				DEBUG(10, ("getsmbfilepwent: LM password for user %s invalidated\n", user_name));
			} else if (pdb_gethexpwd((char *)p, smbpwd)) {
				pw_buf->smb_passwd = smbpwd;
			} else {
				pw_buf->smb_passwd = NULL;
				DEBUG(0, ("getsmbfilepwent: Malformed Lanman password entry for user %s \
(non hex chars)\n", user_name));
			}
		}

		/* 
		 * Now check if the NT compatible password is
		 * available.
		 */
		pw_buf->smb_nt_passwd = NULL;
		p += 33; /* Move to the first character of the line after the lanman password. */
		if ((linebuf_len >= (PTR_DIFF(p, linebuf) + 33)) && (p[32] == ':')) {
			if (*p != '*' && *p != 'X') {
				if(pdb_gethexpwd((char *)p,smbntpwd)) {
					pw_buf->smb_nt_passwd = smbntpwd;
				}
			}
			p += 33; /* Move to the first character of the line after the NT password. */
		}

		DEBUG(5,("getsmbfilepwent: returning passwd entry for user %s, uid %ld\n",
			user_name, uidval));

		if (*p == '[') {
			unsigned char *end_p = (unsigned char *)strchr_m((char *)p, ']');
			pw_buf->acct_ctrl = pdb_decode_acct_ctrl((char*)p);

			/* Must have some account type set. */
			if(pw_buf->acct_ctrl == 0) {
				pw_buf->acct_ctrl = ACB_NORMAL;
			}

			/* Now try and get the last change time. */
			if(end_p) {
				p = end_p + 1;
			}
			if(*p == ':') {
				p++;
				if(*p && (StrnCaseCmp((char *)p, "LCT-", 4)==0)) {
					int i;
					p += 4;
					for(i = 0; i < 8; i++) {
						if(p[i] == '\0' || !isxdigit(p[i])) {
							break;
						}
					}
					if(i == 8) {
						/*
						 * p points at 8 characters of hex digits - 
						 * read into a time_t as the seconds since
						 * 1970 that the password was last changed.
						 */
						pw_buf->pass_last_set_time = (time_t)strtol((char *)p, NULL, 16);
					}
				}
			}
		} else {
			/* 'Old' style file. Fake up based on user name. */
			/*
			 * Currently trust accounts are kept in the same
			 * password file as 'normal accounts'. If this changes
			 * we will have to fix this code. JRA.
			 */
			if(pw_buf->smb_name[strlen(pw_buf->smb_name) - 1] == '$') {
				pw_buf->acct_ctrl &= ~ACB_NORMAL;
				pw_buf->acct_ctrl |= ACB_WSTRUST;
			}
		}

		return pw_buf;
	}

	DEBUG(5,("getsmbfilepwent: end of file reached.\n"));
	return NULL;
}

/************************************************************************
 Create a new smbpasswd entry - malloced space returned.
*************************************************************************/

static char *format_new_smbpasswd_entry(const struct smb_passwd *newpwd)
{
	int new_entry_length;
	char *new_entry;
	char *p;

	new_entry_length = strlen(newpwd->smb_name) + 1 + 15 + 1 + 32 + 1 + 32 + 1 + 
				NEW_PW_FORMAT_SPACE_PADDED_LEN + 1 + 13 + 2;

	if((new_entry = (char *)SMB_MALLOC( new_entry_length )) == NULL) {
		DEBUG(0, ("format_new_smbpasswd_entry: Malloc failed adding entry for user %s.\n",
			newpwd->smb_name ));
		return NULL;
	}

	slprintf(new_entry, new_entry_length - 1, "%s:%u:", newpwd->smb_name, (unsigned)newpwd->smb_userid);

	p = new_entry+strlen(new_entry);
	pdb_sethexpwd(p, newpwd->smb_passwd, newpwd->acct_ctrl);
	p+=strlen(p);
	*p = ':';
	p++;

	pdb_sethexpwd(p, newpwd->smb_nt_passwd, newpwd->acct_ctrl);
	p+=strlen(p);
	*p = ':';
	p++;

	/* Add the account encoding and the last change time. */
	slprintf((char *)p, new_entry_length - 1 - (p - new_entry),  "%s:LCT-%08X:\n",
		pdb_encode_acct_ctrl(newpwd->acct_ctrl, NEW_PW_FORMAT_SPACE_PADDED_LEN),
		(uint32_t)newpwd->pass_last_set_time);

	return new_entry;
}

/************************************************************************
 Routine to add an entry to the smbpasswd file.
*************************************************************************/

static NTSTATUS add_smbfilepwd_entry(struct smbpasswd_privates *smbpasswd_state,
				     struct smb_passwd *newpwd)
{
	const char *pfile = smbpasswd_state->smbpasswd_file;
	struct smb_passwd *pwd = NULL;
	FILE *fp = NULL;
	int wr_len;
	int fd;
	size_t new_entry_length;
	char *new_entry;
	SMB_OFF_T offpos;
 
	/* Open the smbpassword file - for update. */
	fp = startsmbfilepwent(pfile, PWF_UPDATE, &smbpasswd_state->pw_file_lock_depth);

	if (fp == NULL && errno == ENOENT) {
		/* Try again - create. */
		fp = startsmbfilepwent(pfile, PWF_CREATE, &smbpasswd_state->pw_file_lock_depth);
	}

	if (fp == NULL) {
		DEBUG(0, ("add_smbfilepwd_entry: unable to open file.\n"));
		return map_nt_error_from_unix(errno);
	}

	/*
	 * Scan the file, a line at a time and check if the name matches.
	 */

	while ((pwd = getsmbfilepwent(smbpasswd_state, fp)) != NULL) {
		if (strequal(newpwd->smb_name, pwd->smb_name)) {
			DEBUG(0, ("add_smbfilepwd_entry: entry with name %s already exists\n", pwd->smb_name));
			endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
			return NT_STATUS_USER_EXISTS;
		}
	}

	/* Ok - entry doesn't exist. We can add it */

	/* Create a new smb passwd entry and set it to the given password. */
	/* 
	 * The add user write needs to be atomic - so get the fd from 
	 * the fp and do a raw write() call.
	 */
	fd = fileno(fp);

	if((offpos = sys_lseek(fd, 0, SEEK_END)) == -1) {
		NTSTATUS result = map_nt_error_from_unix(errno);
		DEBUG(0, ("add_smbfilepwd_entry(sys_lseek): Failed to add entry for user %s to file %s. \
Error was %s\n", newpwd->smb_name, pfile, strerror(errno)));
		endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
		return result;
	}

	if((new_entry = format_new_smbpasswd_entry(newpwd)) == NULL) {
		DEBUG(0, ("add_smbfilepwd_entry(malloc): Failed to add entry for user %s to file %s. \
Error was %s\n", newpwd->smb_name, pfile, strerror(errno)));
		endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
		return NT_STATUS_NO_MEMORY;
	}

	new_entry_length = strlen(new_entry);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("add_smbfilepwd_entry(%d): new_entry_len %d made line |%s|", 
			fd, (int)new_entry_length, new_entry));
#endif

	if ((wr_len = write(fd, new_entry, new_entry_length)) != new_entry_length) {
		NTSTATUS result = map_nt_error_from_unix(errno);
		DEBUG(0, ("add_smbfilepwd_entry(write): %d Failed to add entry for user %s to file %s. \
Error was %s\n", wr_len, newpwd->smb_name, pfile, strerror(errno)));

		/* Remove the entry we just wrote. */
		if(sys_ftruncate(fd, offpos) == -1) {
			DEBUG(0, ("add_smbfilepwd_entry: ERROR failed to ftruncate file %s. \
Error was %s. Password file may be corrupt ! Please examine by hand !\n", 
				newpwd->smb_name, strerror(errno)));
		}

		endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
		free(new_entry);
		return result;
	}

	free(new_entry);
	endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
	return NT_STATUS_OK;
}

/************************************************************************
 Routine to search the smbpasswd file for an entry matching the username.
 and then modify its password entry. We can't use the startsmbpwent()/
 getsmbpwent()/endsmbpwent() interfaces here as we depend on looking
 in the actual file to decide how much room we have to write data.
 override = False, normal
 override = True, override XXXXXXXX'd out password or NO PASS
************************************************************************/

static bool mod_smbfilepwd_entry(struct smbpasswd_privates *smbpasswd_state, const struct smb_passwd* pwd)
{
	/* Static buffers we will return. */
	fstring user_name;

	char *status;
	char linebuf[256];
	char readbuf[1024];
	int c;
	fstring ascii_p16;
	fstring encode_bits;
	unsigned char *p = NULL;
	size_t linebuf_len = 0;
	FILE *fp;
	int lockfd;
	const char *pfile = smbpasswd_state->smbpasswd_file;
	bool found_entry = False;
	bool got_pass_last_set_time = False;

	SMB_OFF_T pwd_seekpos = 0;

	int i;
	int wr_len;
	int fd;

	if (!*pfile) {
		DEBUG(0, ("No SMB password file set\n"));
		return False;
	}
	DEBUG(10, ("mod_smbfilepwd_entry: opening file %s\n", pfile));

	fp = sys_fopen(pfile, "r+");

	if (fp == NULL) {
		DEBUG(0, ("mod_smbfilepwd_entry: unable to open file %s\n", pfile));
		return False;
	}
	/* Set a buffer to do more efficient reads */
	setvbuf(fp, readbuf, _IOFBF, sizeof(readbuf));

	lockfd = fileno(fp);

	if (!pw_file_lock(lockfd, F_WRLCK, 5, &smbpasswd_state->pw_file_lock_depth)) {
		DEBUG(0, ("mod_smbfilepwd_entry: unable to lock file %s\n", pfile));
		fclose(fp);
		return False;
	}

	/* Make sure it is only rw by the owner */
	chmod(pfile, 0600);

	/* We have a write lock on the file. */
	/*
	 * Scan the file, a line at a time and check if the name matches.
	 */
	status = linebuf;
	while (status && !feof(fp)) {
		pwd_seekpos = sys_ftell(fp);

		linebuf[0] = '\0';

		status = fgets(linebuf, sizeof(linebuf), fp);
		if (status == NULL && ferror(fp)) {
			pw_file_unlock(lockfd, &smbpasswd_state->pw_file_lock_depth);
			fclose(fp);
			return False;
		}

		/*
		 * Check if the string is terminated with a newline - if not
		 * then we must keep reading and discard until we get one.
		 */
		linebuf_len = strlen(linebuf);
		if (linebuf[linebuf_len - 1] != '\n') {
			c = '\0';
			while (!ferror(fp) && !feof(fp)) {
				c = fgetc(fp);
				if (c == '\n') {
					break;
				}
			}
		} else {
			linebuf[linebuf_len - 1] = '\0';
		}

#ifdef DEBUG_PASSWORD
		DEBUG(100, ("mod_smbfilepwd_entry: got line |%s|\n", linebuf));
#endif

		if ((linebuf[0] == 0) && feof(fp)) {
			DEBUG(4, ("mod_smbfilepwd_entry: end of file reached\n"));
			break;
		}

		/*
		 * The line we have should be of the form :-
		 * 
		 * username:uid:[32hex bytes]:....other flags presently
		 * ignored....
		 * 
		 * or,
		 *
		 * username:uid:[32hex bytes]:[32hex bytes]:[attributes]:LCT-XXXXXXXX:...ignored.
		 *
		 * if Windows NT compatible passwords are also present.
		 */

		if (linebuf[0] == '#' || linebuf[0] == '\0') {
			DEBUG(6, ("mod_smbfilepwd_entry: skipping comment or blank line\n"));
			continue;
		}

		p = (unsigned char *) strchr_m(linebuf, ':');

		if (p == NULL) {
			DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry (no :)\n"));
			continue;
		}

		strncpy(user_name, linebuf, PTR_DIFF(p, linebuf));
		user_name[PTR_DIFF(p, linebuf)] = '\0';
		if (strequal(user_name, pwd->smb_name)) {
			found_entry = True;
			break;
		}
	}

	if (!found_entry) {
		pw_file_unlock(lockfd, &smbpasswd_state->pw_file_lock_depth);
		fclose(fp);

		DEBUG(2, ("Cannot update entry for user %s, as they don't exist in the smbpasswd file!\n",
			pwd->smb_name));
		return False;
	}

	DEBUG(6, ("mod_smbfilepwd_entry: entry exists for user %s\n", pwd->smb_name));

	/* User name matches - get uid and password */
	p++; /* Go past ':' */

	if (!isdigit(*p)) {
		DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry for user %s (uid not number)\n",
			pwd->smb_name));
		pw_file_unlock(lockfd, &smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	while (*p && isdigit(*p)) {
		p++;
	}
	if (*p != ':') {
		DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry for user %s (no : after uid)\n",
			pwd->smb_name));
		pw_file_unlock(lockfd, &smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	/*
	 * Now get the password value - this should be 32 hex digits
	 * which are the ascii representations of a 16 byte string.
	 * Get two at a time and put them into the password.
	 */
	p++;

	/* Record exact password position */
	pwd_seekpos += PTR_DIFF(p, linebuf);

	if (linebuf_len < (PTR_DIFF(p, linebuf) + 33)) {
		DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry for user %s (passwd too short)\n",
			pwd->smb_name));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return (False);
	}

	if (p[32] != ':') {
		DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry for user %s (no terminating :)\n",
			pwd->smb_name));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	/* Now check if the NT compatible password is available. */
	p += 33; /* Move to the first character of the line after the lanman password. */
	if (linebuf_len < (PTR_DIFF(p, linebuf) + 33)) {
		DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry for user %s (passwd too short)\n",
			pwd->smb_name));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return (False);
	}

	if (p[32] != ':') {
		DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry for user %s (no terminating :)\n",
			pwd->smb_name));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	/* 
	 * Now check if the account info and the password last
	 * change time is available.
	 */
	p += 33; /* Move to the first character of the line after the NT password. */

	if (*p == '[') {
		i = 0;
		encode_bits[i++] = *p++;
		while((linebuf_len > PTR_DIFF(p, linebuf)) && (*p != ']')) {
			encode_bits[i++] = *p++;
		}

		encode_bits[i++] = ']';
		encode_bits[i++] = '\0';

		if(i == NEW_PW_FORMAT_SPACE_PADDED_LEN) {
			/*
			 * We are using a new format, space padded
			 * acct ctrl field. Encode the given acct ctrl
			 * bits into it.
			 */
			fstrcpy(encode_bits, pdb_encode_acct_ctrl(pwd->acct_ctrl, NEW_PW_FORMAT_SPACE_PADDED_LEN));
		} else {
			DEBUG(0,("mod_smbfilepwd_entry:  Using old smbpasswd format for user %s. \
This is no longer supported.!\n", pwd->smb_name));
			DEBUG(0,("mod_smbfilepwd_entry:  No changes made, failing.!\n"));
			pw_file_unlock(lockfd, &smbpasswd_state->pw_file_lock_depth);
			fclose(fp);
			return False;
		}

		/* Go past the ']' */
		if(linebuf_len > PTR_DIFF(p, linebuf)) {
			p++;
		}

		if((linebuf_len > PTR_DIFF(p, linebuf)) && (*p == ':')) {
			p++;

			/* We should be pointing at the LCT entry. */
			if((linebuf_len > (PTR_DIFF(p, linebuf) + 13)) && (StrnCaseCmp((char *)p, "LCT-", 4) == 0)) {
				p += 4;
				for(i = 0; i < 8; i++) {
					if(p[i] == '\0' || !isxdigit(p[i])) {
						break;
					}
				}
				if(i == 8) {
					/*
					 * p points at 8 characters of hex digits -
					 * read into a time_t as the seconds since
					 * 1970 that the password was last changed.
					 */
					got_pass_last_set_time = True;
				} /* i == 8 */
			} /* *p && StrnCaseCmp() */
		} /* p == ':' */
	} /* p == '[' */

	/* Entry is correctly formed. */

	/* Create the 32 byte representation of the new p16 */
	pdb_sethexpwd(ascii_p16, pwd->smb_passwd, pwd->acct_ctrl);

	/* Add on the NT md4 hash */
	ascii_p16[32] = ':';
	wr_len = 66;
	pdb_sethexpwd(ascii_p16+33, pwd->smb_nt_passwd, pwd->acct_ctrl);
	ascii_p16[65] = ':';
	ascii_p16[66] = '\0'; /* null-terminate the string so that strlen works */

	/* Add on the account info bits and the time of last password change. */
	if(got_pass_last_set_time) {
		slprintf(&ascii_p16[strlen(ascii_p16)], 
			sizeof(ascii_p16)-(strlen(ascii_p16)+1),
			"%s:LCT-%08X:", 
			encode_bits, (uint32_t)pwd->pass_last_set_time );
		wr_len = strlen(ascii_p16);
	}

#ifdef DEBUG_PASSWORD
	DEBUG(100,("mod_smbfilepwd_entry: "));
	dump_data(100, (uint8 *)ascii_p16, wr_len);
#endif

	if(wr_len > sizeof(linebuf)) {
		DEBUG(0, ("mod_smbfilepwd_entry: line to write (%d) is too long.\n", wr_len+1));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return (False);
	}

	/*
	 * Do an atomic write into the file at the position defined by
	 * seekpos.
	 */

	/* The mod user write needs to be atomic - so get the fd from 
		the fp and do a raw write() call.
	 */

	fd = fileno(fp);

	if (sys_lseek(fd, pwd_seekpos - 1, SEEK_SET) != pwd_seekpos - 1) {
		DEBUG(0, ("mod_smbfilepwd_entry: seek fail on file %s.\n", pfile));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	/* Sanity check - ensure the areas we are writing are framed by ':' */
	if (read(fd, linebuf, wr_len+1) != wr_len+1) {
		DEBUG(0, ("mod_smbfilepwd_entry: read fail on file %s.\n", pfile));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	if ((linebuf[0] != ':') || (linebuf[wr_len] != ':'))	{
		DEBUG(0, ("mod_smbfilepwd_entry: check on passwd file %s failed.\n", pfile));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}
 
	if (sys_lseek(fd, pwd_seekpos, SEEK_SET) != pwd_seekpos) {
		DEBUG(0, ("mod_smbfilepwd_entry: seek fail on file %s.\n", pfile));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	if (write(fd, ascii_p16, wr_len) != wr_len) {
		DEBUG(0, ("mod_smbfilepwd_entry: write failed in passwd file %s\n", pfile));
		pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
		fclose(fp);
		return False;
	}

	pw_file_unlock(lockfd,&smbpasswd_state->pw_file_lock_depth);
	fclose(fp);
	return True;
}

/************************************************************************
 Routine to delete an entry in the smbpasswd file by name.
*************************************************************************/

static bool del_smbfilepwd_entry(struct smbpasswd_privates *smbpasswd_state, const char *name)
{
	const char *pfile = smbpasswd_state->smbpasswd_file;
	char *pfile2 = NULL;
	struct smb_passwd *pwd = NULL;
	FILE *fp = NULL;
	FILE *fp_write = NULL;
	int pfile2_lockdepth = 0;

	pfile2 = talloc_asprintf(talloc_tos(),
			"%s.%u",
			pfile, (unsigned)sys_getpid());
	if (!pfile2) {
		return false;
	}

	/*
	 * Open the smbpassword file - for update. It needs to be update
	 * as we need any other processes to wait until we have replaced
	 * it.
	 */

	if((fp = startsmbfilepwent(pfile, PWF_UPDATE, &smbpasswd_state->pw_file_lock_depth)) == NULL) {
		DEBUG(0, ("del_smbfilepwd_entry: unable to open file %s.\n", pfile));
		return False;
	}

	/*
	 * Create the replacement password file.
	 */
	if((fp_write = startsmbfilepwent(pfile2, PWF_CREATE, &pfile2_lockdepth)) == NULL) {
		DEBUG(0, ("del_smbfilepwd_entry: unable to open file %s.\n", pfile));
		endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
		return False;
	}

	/*
	 * Scan the file, a line at a time and check if the name matches.
	 */

	while ((pwd = getsmbfilepwent(smbpasswd_state, fp)) != NULL) {
		char *new_entry;
		size_t new_entry_length;

		if (strequal(name, pwd->smb_name)) {
			DEBUG(10, ("del_smbfilepwd_entry: found entry with "
				   "name %s - deleting it.\n", name));
			continue;
		}

		/*
		 * We need to copy the entry out into the second file.
		 */

		if((new_entry = format_new_smbpasswd_entry(pwd)) == NULL) {
			DEBUG(0, ("del_smbfilepwd_entry(malloc): Failed to copy entry for user %s to file %s. \
Error was %s\n", pwd->smb_name, pfile2, strerror(errno)));
			unlink(pfile2);
			endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
			endsmbfilepwent(fp_write, &pfile2_lockdepth);
			return False;
		}

		new_entry_length = strlen(new_entry);

		if(fwrite(new_entry, 1, new_entry_length, fp_write) != new_entry_length) {
			DEBUG(0, ("del_smbfilepwd_entry(write): Failed to copy entry for user %s to file %s. \
Error was %s\n", pwd->smb_name, pfile2, strerror(errno)));
			unlink(pfile2);
			endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
			endsmbfilepwent(fp_write, &pfile2_lockdepth);
			free(new_entry);
			return False;
		}

		free(new_entry);
	}

	/*
	 * Ensure pfile2 is flushed before rename.
	 */

	if(fflush(fp_write) != 0) {
		DEBUG(0, ("del_smbfilepwd_entry: Failed to flush file %s. Error was %s\n", pfile2, strerror(errno)));
		endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
		endsmbfilepwent(fp_write,&pfile2_lockdepth);
		return False;
	}

	/*
	 * Do an atomic rename - then release the locks.
	 */

	if(rename(pfile2,pfile) != 0) {
		unlink(pfile2);
	}

	endsmbfilepwent(fp, &smbpasswd_state->pw_file_lock_depth);
	endsmbfilepwent(fp_write,&pfile2_lockdepth);
	return True;
}

/*********************************************************************
 Create a smb_passwd struct from a struct samu.
 We will not allocate any new memory.  The smb_passwd struct
 should only stay around as long as the struct samu does.
 ********************************************************************/

static bool build_smb_pass (struct smb_passwd *smb_pw, const struct samu *sampass)
{
	uint32_t rid;

	if (sampass == NULL) 
		return False;
	ZERO_STRUCTP(smb_pw);

	if (!IS_SAM_DEFAULT(sampass, PDB_USERSID)) {
		rid = pdb_get_user_rid(sampass);

		/* If the user specified a RID, make sure its able to be both stored and retreived */
		if (rid == DOMAIN_RID_GUEST) {
			struct passwd *passwd = Get_Pwnam_alloc(NULL, lp_guestaccount());
			if (!passwd) {
				DEBUG(0, ("Could not find guest account via Get_Pwnam_alloc()! (%s)\n", lp_guestaccount()));
				return False;
			}
			smb_pw->smb_userid=passwd->pw_uid;
			TALLOC_FREE(passwd);
		} else if (algorithmic_pdb_rid_is_user(rid)) {
			smb_pw->smb_userid=algorithmic_pdb_user_rid_to_uid(rid);
		} else {
			DEBUG(0,("build_sam_pass: Failing attempt to store user with non-uid based user RID. \n"));
			return False;
		}
	}

	smb_pw->smb_name=(const char*)pdb_get_username(sampass);

	smb_pw->smb_passwd=pdb_get_lanman_passwd(sampass);
	smb_pw->smb_nt_passwd=pdb_get_nt_passwd(sampass);

	smb_pw->acct_ctrl=pdb_get_acct_ctrl(sampass);
	smb_pw->pass_last_set_time=pdb_get_pass_last_set_time(sampass);

	return True;
}	

/*********************************************************************
 Create a struct samu from a smb_passwd struct
 ********************************************************************/

static bool build_sam_account(struct smbpasswd_privates *smbpasswd_state, 
			      struct samu *sam_pass, const struct smb_passwd *pw_buf)
{
	struct passwd *pwfile;

	if ( !sam_pass ) {
		DEBUG(5,("build_sam_account: struct samu is NULL\n"));
		return False;
	}

	/* verify the user account exists */

	if ( !(pwfile = Get_Pwnam_alloc(NULL, pw_buf->smb_name )) ) {
		DEBUG(0,("build_sam_account: smbpasswd database is corrupt!  username %s with uid "
		"%u is not in unix passwd database!\n", pw_buf->smb_name, pw_buf->smb_userid));
			return False;
	}

	if ( !NT_STATUS_IS_OK( samu_set_unix(sam_pass, pwfile )) )
		return False;

	TALLOC_FREE(pwfile);

	/* set remaining fields */

	if (!pdb_set_nt_passwd (sam_pass, pw_buf->smb_nt_passwd, PDB_SET))
		return False;
	if (!pdb_set_lanman_passwd (sam_pass, pw_buf->smb_passwd, PDB_SET))
		return False;
	pdb_set_acct_ctrl (sam_pass, pw_buf->acct_ctrl, PDB_SET);
	pdb_set_pass_last_set_time (sam_pass, pw_buf->pass_last_set_time, PDB_SET);
	pdb_set_pass_can_change_time (sam_pass, pw_buf->pass_last_set_time, PDB_SET);

	return True;
}

/*****************************************************************
 Functions to be implemented by the new passdb API 
 ****************************************************************/

/****************************************************************
 Search smbpasswd file by iterating over the entries.  Do not
 call getpwnam() for unix account information until we have found
 the correct entry
 ***************************************************************/

static NTSTATUS smbpasswd_getsampwnam(struct pdb_methods *my_methods, 
				  struct samu *sam_acct, const char *username)
{
	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
	struct smbpasswd_privates *smbpasswd_state = (struct smbpasswd_privates*)my_methods->private_data;
	struct smb_passwd *smb_pw;
	FILE *fp = NULL;

	DEBUG(10, ("getsampwnam (smbpasswd): search by name: %s\n", username));

	/* startsmbfilepwent() is used here as we don't want to lookup
	   the UNIX account in the local system password file until
	   we have a match.  */
	fp = startsmbfilepwent(smbpasswd_state->smbpasswd_file, PWF_READ, &(smbpasswd_state->pw_file_lock_depth));

	if (fp == NULL) {
		DEBUG(0, ("Unable to open passdb database.\n"));
		return nt_status;
	}

	while ( ((smb_pw=getsmbfilepwent(smbpasswd_state, fp)) != NULL)&& (!strequal(smb_pw->smb_name, username)) )
		/* do nothing....another loop */ ;

	endsmbfilepwent(fp, &(smbpasswd_state->pw_file_lock_depth));


	/* did we locate the username in smbpasswd  */
	if (smb_pw == NULL)
		return nt_status;

	DEBUG(10, ("getsampwnam (smbpasswd): found by name: %s\n", smb_pw->smb_name));

	if (!sam_acct) {
		DEBUG(10,("getsampwnam (smbpasswd): struct samu is NULL\n"));
		return nt_status;
	}

	/* now build the struct samu */
	if (!build_sam_account(smbpasswd_state, sam_acct, smb_pw))
		return nt_status;

	/* success */
	return NT_STATUS_OK;
}

static NTSTATUS smbpasswd_getsampwsid(struct pdb_methods *my_methods, struct samu *sam_acct, const struct dom_sid *sid)
{
	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
	struct smbpasswd_privates *smbpasswd_state = (struct smbpasswd_privates*)my_methods->private_data;
	struct smb_passwd *smb_pw;
	FILE *fp = NULL;
	uint32_t rid;

	DEBUG(10, ("smbpasswd_getsampwrid: search by sid: %s\n",
		   sid_string_dbg(sid)));

	if (!sid_peek_check_rid(get_global_sam_sid(), sid, &rid))
		return NT_STATUS_UNSUCCESSFUL;

	/* More special case 'guest account' hacks... */
	if (rid == DOMAIN_RID_GUEST) {
		const char *guest_account = lp_guestaccount();
		if (!(guest_account && *guest_account)) {
			DEBUG(1, ("Guest account not specfied!\n"));
			return nt_status;
		}
		return smbpasswd_getsampwnam(my_methods, sam_acct, guest_account);
	}

	/* Open the sam password file - not for update. */
	fp = startsmbfilepwent(smbpasswd_state->smbpasswd_file, PWF_READ, &(smbpasswd_state->pw_file_lock_depth));

	if (fp == NULL) {
		DEBUG(0, ("Unable to open passdb database.\n"));
		return nt_status;
	}

	while ( ((smb_pw=getsmbfilepwent(smbpasswd_state, fp)) != NULL) && (algorithmic_pdb_uid_to_user_rid(smb_pw->smb_userid) != rid) )
      		/* do nothing */ ;

	endsmbfilepwent(fp, &(smbpasswd_state->pw_file_lock_depth));


	/* did we locate the username in smbpasswd  */
	if (smb_pw == NULL)
		return nt_status;

	DEBUG(10, ("getsampwrid (smbpasswd): found by name: %s\n", smb_pw->smb_name));

	if (!sam_acct) {
		DEBUG(10,("getsampwrid: (smbpasswd) struct samu is NULL\n"));
		return nt_status;
	}

	/* now build the struct samu */
	if (!build_sam_account (smbpasswd_state, sam_acct, smb_pw))
		return nt_status;

	/* build_sam_account might change the SID on us, if the name was for the guest account */
	if (NT_STATUS_IS_OK(nt_status) && !dom_sid_equal(pdb_get_user_sid(sam_acct), sid)) {
		DEBUG(1, ("looking for user with sid %s instead returned %s "
			  "for account %s!?!\n", sid_string_dbg(sid),
			  sid_string_dbg(pdb_get_user_sid(sam_acct)),
			  pdb_get_username(sam_acct)));
		return NT_STATUS_NO_SUCH_USER;
	}

	/* success */
	return NT_STATUS_OK;
}

static NTSTATUS smbpasswd_add_sam_account(struct pdb_methods *my_methods, struct samu *sampass)
{
	struct smbpasswd_privates *smbpasswd_state = (struct smbpasswd_privates*)my_methods->private_data;
	struct smb_passwd smb_pw;

	/* convert the struct samu */
	if (!build_smb_pass(&smb_pw, sampass)) {
		return NT_STATUS_UNSUCCESSFUL;
	}

	/* add the entry */
	return add_smbfilepwd_entry(smbpasswd_state, &smb_pw);
}

static NTSTATUS smbpasswd_update_sam_account(struct pdb_methods *my_methods, struct samu *sampass)
{
	struct smbpasswd_privates *smbpasswd_state = (struct smbpasswd_privates*)my_methods->private_data;
	struct smb_passwd smb_pw;

	/* convert the struct samu */
	if (!build_smb_pass(&smb_pw, sampass)) {
		DEBUG(0, ("smbpasswd_update_sam_account: build_smb_pass failed!\n"));
		return NT_STATUS_UNSUCCESSFUL;
	}

	/* update the entry */
	if(!mod_smbfilepwd_entry(smbpasswd_state, &smb_pw)) {
		DEBUG(0, ("smbpasswd_update_sam_account: mod_smbfilepwd_entry failed!\n"));
		return NT_STATUS_UNSUCCESSFUL;
	}

	return NT_STATUS_OK;
}

static NTSTATUS smbpasswd_delete_sam_account (struct pdb_methods *my_methods, struct samu *sampass)
{
	struct smbpasswd_privates *smbpasswd_state = (struct smbpasswd_privates*)my_methods->private_data;

	const char *username = pdb_get_username(sampass);

	if (del_smbfilepwd_entry(smbpasswd_state, username))
		return NT_STATUS_OK;

	return NT_STATUS_UNSUCCESSFUL;
}

static NTSTATUS smbpasswd_rename_sam_account (struct pdb_methods *my_methods, 
					      struct samu *old_acct,
					      const char *newname)
{
	char *rename_script = NULL;
	struct samu *new_acct = NULL;
	bool interim_account = False;
	TALLOC_CTX *ctx = talloc_tos();
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;

	if (!*(lp_renameuser_script()))
		goto done;

	if ( !(new_acct = samu_new( NULL )) ) {
		return NT_STATUS_NO_MEMORY;
	}

	if ( !pdb_copy_sam_account( new_acct, old_acct ) 
		|| !pdb_set_username(new_acct, newname, PDB_CHANGED)) 
	{
		goto done;
	}

	ret = smbpasswd_add_sam_account(my_methods, new_acct);
	if (!NT_STATUS_IS_OK(ret))
		goto done;

	interim_account = True;

	/* rename the posix user */
	rename_script = talloc_strdup(ctx,
				lp_renameuser_script());
	if (!rename_script) {
		ret = NT_STATUS_NO_MEMORY;
		goto done;
	}

	if (*rename_script) {
	        int rename_ret;

		rename_script = talloc_string_sub2(ctx,
					rename_script,
					"%unew",
					newname,
					true,
					false,
					true);
		if (!rename_script) {
			ret = NT_STATUS_NO_MEMORY;
			goto done;
		}
		rename_script = talloc_string_sub2(ctx,
					rename_script,
					"%uold",
					pdb_get_username(old_acct),
					true,
					false,
					true);
		if (!rename_script) {
			ret = NT_STATUS_NO_MEMORY;
			goto done;
		}

		rename_ret = smbrun(rename_script, NULL);

		DEBUG(rename_ret ? 0 : 3,("Running the command `%s' gave %d\n", rename_script, rename_ret));

		if (rename_ret == 0) {
			smb_nscd_flush_user_cache();
		}

		if (rename_ret)
			goto done;
        } else {
		goto done;
	}

	smbpasswd_delete_sam_account(my_methods, old_acct);
	interim_account = False;

done:
	/* cleanup */
	if (interim_account)
		smbpasswd_delete_sam_account(my_methods, new_acct);

	if (new_acct)
		TALLOC_FREE(new_acct);

	return (ret);	
}

static uint32_t smbpasswd_capabilities(struct pdb_methods *methods)
{
	return 0;
}

static void free_private_data(void **vp) 
{
	struct smbpasswd_privates **privates = (struct smbpasswd_privates**)vp;

	endsmbfilepwent((*privates)->pw_file, &((*privates)->pw_file_lock_depth));

	*privates = NULL;
	/* No need to free any further, as it is talloc()ed */
}

struct smbpasswd_search_state {
	uint32_t acct_flags;

	struct samr_displayentry *entries;
	uint32_t num_entries;
	ssize_t array_size;
	uint32_t current;
};

static void smbpasswd_search_end(struct pdb_search *search)
{
	struct smbpasswd_search_state *state = talloc_get_type_abort(
		search->private_data, struct smbpasswd_search_state);
	TALLOC_FREE(state);
}

static bool smbpasswd_search_next_entry(struct pdb_search *search,
					struct samr_displayentry *entry)
{
	struct smbpasswd_search_state *state = talloc_get_type_abort(
		search->private_data, struct smbpasswd_search_state);

	if (state->current == state->num_entries) {
		return false;
	}

	entry->idx = state->entries[state->current].idx;
	entry->rid = state->entries[state->current].rid;
	entry->acct_flags = state->entries[state->current].acct_flags;

	entry->account_name = talloc_strdup(
		search, state->entries[state->current].account_name);
	entry->fullname = talloc_strdup(
		search, state->entries[state->current].fullname);
	entry->description = talloc_strdup(
		search, state->entries[state->current].description);

	if ((entry->account_name == NULL) || (entry->fullname == NULL)
	    || (entry->description == NULL)) {
		DEBUG(0, ("talloc_strdup failed\n"));
		return false;
	}

	state->current += 1;
	return true;
}

static bool smbpasswd_search_users(struct pdb_methods *methods,
				   struct pdb_search *search,
				   uint32_t acct_flags)
{
	struct smbpasswd_privates *smbpasswd_state =
		(struct smbpasswd_privates*)methods->private_data;

	struct smbpasswd_search_state *search_state;
	struct smb_passwd *pwd;
	FILE *fp;

	search_state = talloc_zero(search, struct smbpasswd_search_state);
	if (search_state == NULL) {
		DEBUG(0, ("talloc failed\n"));
		return false;
	}
	search_state->acct_flags = acct_flags;

	fp = startsmbfilepwent(smbpasswd_state->smbpasswd_file, PWF_READ,
			       &smbpasswd_state->pw_file_lock_depth);

	if (fp == NULL) {
		DEBUG(10, ("Unable to open smbpasswd file.\n"));
		TALLOC_FREE(search_state);
		return false;
	}

	while ((pwd = getsmbfilepwent(smbpasswd_state, fp)) != NULL) {
		struct samr_displayentry entry;
		struct samu *user;

		if ((acct_flags != 0)
		    && ((acct_flags & pwd->acct_ctrl) == 0)) {
			continue;
		}

		user = samu_new(talloc_tos());
		if (user == NULL) {
			DEBUG(0, ("samu_new failed\n"));
			break;
		}

		if (!build_sam_account(smbpasswd_state, user, pwd)) {
			/* Already got debug msgs... */
			break;
		}

		ZERO_STRUCT(entry);

		entry.acct_flags = pdb_get_acct_ctrl(user);
		sid_peek_rid(pdb_get_user_sid(user), &entry.rid);
		entry.account_name = talloc_strdup(
			search_state, pdb_get_username(user));
		entry.fullname = talloc_strdup(
			search_state, pdb_get_fullname(user));
		entry.description = talloc_strdup(
			search_state, pdb_get_acct_desc(user));

		TALLOC_FREE(user);

		if ((entry.account_name == NULL) || (entry.fullname == NULL)
		    || (entry.description == NULL)) {
			DEBUG(0, ("talloc_strdup failed\n"));
			break;
		}

		ADD_TO_LARGE_ARRAY(search_state, struct samr_displayentry,
				   entry, &search_state->entries,
				   &search_state->num_entries,
				   &search_state->array_size);
	}

	endsmbfilepwent(fp, &(smbpasswd_state->pw_file_lock_depth));

	search->private_data = search_state;
	search->next_entry = smbpasswd_search_next_entry;
	search->search_end = smbpasswd_search_end;

	return true;
}

static NTSTATUS pdb_init_smbpasswd( struct pdb_methods **pdb_method, const char *location )
{
	NTSTATUS nt_status;
	struct smbpasswd_privates *privates;

	if ( !NT_STATUS_IS_OK(nt_status = make_pdb_method( pdb_method )) ) {
		return nt_status;
	}

	(*pdb_method)->name = "smbpasswd";

	(*pdb_method)->getsampwnam = smbpasswd_getsampwnam;
	(*pdb_method)->getsampwsid = smbpasswd_getsampwsid;
	(*pdb_method)->add_sam_account = smbpasswd_add_sam_account;
	(*pdb_method)->update_sam_account = smbpasswd_update_sam_account;
	(*pdb_method)->delete_sam_account = smbpasswd_delete_sam_account;
	(*pdb_method)->rename_sam_account = smbpasswd_rename_sam_account;
	(*pdb_method)->search_users = smbpasswd_search_users;

	(*pdb_method)->capabilities = smbpasswd_capabilities;

	/* Setup private data and free function */

	if ( !(privates = TALLOC_ZERO_P( *pdb_method, struct smbpasswd_privates )) ) {
		DEBUG(0, ("talloc() failed for smbpasswd private_data!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/* Store some config details */

	if (location) {
		privates->smbpasswd_file = talloc_strdup(*pdb_method, location);
	} else {
		privates->smbpasswd_file = talloc_strdup(*pdb_method, lp_smb_passwd_file());
	}

	if (!privates->smbpasswd_file) {
		DEBUG(0, ("talloc_strdp() failed for storing smbpasswd location!\n"));
		return NT_STATUS_NO_MEMORY;
	}

	(*pdb_method)->private_data = privates;

	(*pdb_method)->free_private_data = free_private_data;

	return NT_STATUS_OK;
}

NTSTATUS pdb_smbpasswd_init(void) 
{
	return smb_register_passdb(PASSDB_INTERFACE_VERSION, "smbpasswd", pdb_init_smbpasswd);
}