summaryrefslogtreecommitdiff
path: root/source3/smbd/password.c
blob: 03d96bebc054de3b1c17b94e43fdc3849d01bb45 (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
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Password and authentication handling
   Copyright (C) Andrew Tridgell 1992-1998
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern int DEBUGLEVEL;
extern int Protocol;
extern struct in_addr ipzero;

/* users from session setup */
static pstring session_users="";

extern pstring global_myname;
extern fstring global_myworkgroup;

/* Data to do lanman1/2 password challenge. */
static unsigned char saved_challenge[8];
static BOOL challenge_sent=False;

/*******************************************************************
Get the next challenge value - no repeats.
********************************************************************/
void generate_next_challenge(char *challenge)
{
#if 0
        /* 
         * Leave this ifdef'd out while we test
         * the new crypto random number generator.
         * JRA.
         */
	unsigned char buf[16];
	static int counter = 0;
	struct timeval tval;
	int v1,v2;

	/* get a sort-of random number */
	GetTimeOfDay(&tval);
	v1 = (counter++) + sys_getpid() + tval.tv_sec;
	v2 = (counter++) * sys_getpid() + tval.tv_usec;
	SIVAL(challenge,0,v1);
	SIVAL(challenge,4,v2);

	/* mash it up with md4 */
	mdfour(buf, (unsigned char *)challenge, 8);
#else
        unsigned char buf[8];

        generate_random_buffer(buf,8,False);
#endif 
	memcpy(saved_challenge, buf, 8);
	memcpy(challenge,buf,8);
	challenge_sent = True;
}

/*******************************************************************
set the last challenge sent, usually from a password server
********************************************************************/
BOOL set_challenge(unsigned char *challenge)
{
  memcpy(saved_challenge,challenge,8);
  challenge_sent = True;
  return(True);
}

/*******************************************************************
get the last challenge sent
********************************************************************/
static BOOL last_challenge(unsigned char *challenge)
{
  if (!challenge_sent) return(False);
  memcpy(challenge,saved_challenge,8);
  return(True);
}

/* this holds info on user ids that are already validated for this VC */
static user_struct *validated_users;
static int next_vuid = VUID_OFFSET;
static int num_validated_vuids;

/****************************************************************************
check if a uid has been validated, and return an pointer to the user_struct
if it has. NULL if not. vuid is biased by an offset. This allows us to
tell random client vuid's (normally zero) from valid vuids.
****************************************************************************/
user_struct *get_valid_user_struct(uint16 vuid)
{
	user_struct *usp;
	int count=0;

	if (vuid == UID_FIELD_INVALID)
		return NULL;

	for (usp=validated_users;usp;usp=usp->next,count++) {
		if (vuid == usp->vuid) {
			if (count > 10) {
				DLIST_PROMOTE(validated_users, usp);
			}
			return usp;
		}
	}

	return NULL;
}

/****************************************************************************
invalidate a uid
****************************************************************************/
void invalidate_vuid(uint16 vuid)
{
	user_struct *vuser = get_valid_user_struct(vuid);

	if (vuser == NULL)
		return;

	session_yield(vuid);

	DLIST_REMOVE(validated_users, vuser);

	safe_free(vuser->groups);
	delete_nt_token(&vuser->nt_user_token);
	safe_free(vuser);
	num_validated_vuids--;
}

/****************************************************************************
invalidate all vuid entries for this process
****************************************************************************/
void invalidate_all_vuids(void)
{
	user_struct *usp, *next=NULL;

	for (usp=validated_users;usp;usp=next) {
		next = usp->next;
		
		invalidate_vuid(usp->vuid);
	}
}

/****************************************************************************
return a validated username
****************************************************************************/
char *validated_username(uint16 vuid)
{
	user_struct *vuser = get_valid_user_struct(vuid);
	if (vuser == NULL)
		return 0;
	return(vuser->user.unix_name);
}

/****************************************************************************
return a validated domain
****************************************************************************/
char *validated_domain(uint16 vuid)
{
	user_struct *vuser = get_valid_user_struct(vuid);
	if (vuser == NULL)
		return 0;
	return(vuser->user.domain);
}


/****************************************************************************
 Create the SID list for this user.
****************************************************************************/

NT_USER_TOKEN *create_nt_token(uid_t uid, gid_t gid, int ngroups, gid_t *groups, BOOL is_guest)
{
	extern DOM_SID global_sid_World;
	extern DOM_SID global_sid_Network;
	extern DOM_SID global_sid_Builtin_Guests;
	extern DOM_SID global_sid_Authenticated_Users;
	NT_USER_TOKEN *token;
	DOM_SID *psids;
	int i, psid_ndx = 0;
	size_t num_sids = 0;
	fstring sid_str;

	if ((token = (NT_USER_TOKEN *)malloc( sizeof(NT_USER_TOKEN) ) ) == NULL)
		return NULL;

	ZERO_STRUCTP(token);

	/* We always have uid/gid plus World and Network and Authenticated Users or Guest SIDs. */
	num_sids = 5 + ngroups;

	if ((token->user_sids = (DOM_SID *)malloc( num_sids*sizeof(DOM_SID))) == NULL) {
		free(token);
		return NULL;
	}

	psids = token->user_sids;

	/*
	 * Note - user SID *MUST* be first in token !
	 * se_access_check depends on this.
	 */

	uid_to_sid( &psids[psid_ndx++], uid);

	/*
	 * Primary group SID is second in token. Convention.
	 */

	gid_to_sid( &psids[psid_ndx++], gid);

	/* Now add the group SIDs. */

	for (i = 0; i < ngroups; i++) {
		if (groups[i] != gid) {
			gid_to_sid( &psids[psid_ndx++], groups[i]);
		}
	}

	/*
	 * Finally add the "standard" SIDs.
	 * The only difference between guest and "anonymous" (which we
	 * don't really support) is the addition of Authenticated_Users.
	 */

	sid_copy( &psids[psid_ndx++], &global_sid_World);
	sid_copy( &psids[psid_ndx++], &global_sid_Network);

	if (is_guest)
		sid_copy( &psids[psid_ndx++], &global_sid_Builtin_Guests);
	else
		sid_copy( &psids[psid_ndx++], &global_sid_Authenticated_Users);

	token->num_sids = psid_ndx;

	/* Dump list of sids in token */

	for (i = 0; i < token->num_sids; i++) {
		DEBUG(5, ("user token sid %s\n", 
			  sid_to_string(sid_str, &token->user_sids[i])));
	}

	return token;
}

/****************************************************************************
register a uid/name pair as being valid and that a valid password
has been given. vuid is biased by an offset. This allows us to
tell random client vuid's (normally zero) from valid vuids.
****************************************************************************/

int register_vuid(uid_t uid,gid_t gid, char *unix_name, char *requested_name, 
		  char *domain,BOOL guest)
{
	user_struct *vuser = NULL;
	struct passwd *pwfile; /* for getting real name from passwd file */

	/* Ensure no vuid gets registered in share level security. */
	if(lp_security() == SEC_SHARE)
		return UID_FIELD_INVALID;

	/* Limit allowed vuids to 16bits - VUID_OFFSET. */
	if (num_validated_vuids >= 0xFFFF-VUID_OFFSET)
		return UID_FIELD_INVALID;

	if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) {
		DEBUG(0,("Failed to malloc users struct!\n"));
		return UID_FIELD_INVALID;
	}

	ZERO_STRUCTP(vuser);

	DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n", (unsigned int)uid, (unsigned int)gid,
				unix_name, requested_name, domain, guest ));

	/* Allocate a free vuid. Yes this is a linear search... :-) */
	while( get_valid_user_struct(next_vuid) != NULL ) {
		next_vuid++;
		/* Check for vuid wrap. */
		if (next_vuid == UID_FIELD_INVALID)
			next_vuid = VUID_OFFSET;
	}

	DEBUG(10,("register_vuid: allocated vuid = %u\n", (unsigned int)next_vuid ));

	vuser->vuid = next_vuid;
	vuser->uid = uid;
	vuser->gid = gid;
	vuser->guest = guest;
	fstrcpy(vuser->user.unix_name,unix_name);
	fstrcpy(vuser->user.smb_name,requested_name);
	fstrcpy(vuser->user.domain,domain);

	vuser->n_groups = 0;
	vuser->groups  = NULL;

	/* Find all the groups this uid is in and store them. 
		Used by become_user() */
	initialise_groups(unix_name, uid, gid);
	get_current_groups( &vuser->n_groups, &vuser->groups);

	/* Create an NT_USER_TOKEN struct for this user. */
	vuser->nt_user_token = create_nt_token(uid,gid, vuser->n_groups, vuser->groups, guest);

	next_vuid++;
	num_validated_vuids++;

	DLIST_ADD(validated_users, vuser);

	DEBUG(3,("uid %d registered to name %s\n",(int)uid,unix_name));

	DEBUG(3, ("Clearing default real name\n"));
	if ((pwfile=sys_getpwnam(vuser->user.unix_name))!= NULL) {
		DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,pwfile->pw_gecos));
		fstrcpy(vuser->user.full_name, pwfile->pw_gecos);
	}

	if (!session_claim(vuser->vuid)) {
		DEBUG(1,("Failed to claim session for vuid=%d\n", vuser->vuid));
		invalidate_vuid(vuser->vuid);
		return -1;
	}

	return vuser->vuid;
}


/****************************************************************************
add a name to the session users list
****************************************************************************/
void add_session_user(char *user)
{
  fstring suser;
  StrnCpy(suser,user,sizeof(suser)-1);

  if (!Get_Pwnam(suser,True)) return;

  if (suser && *suser && !in_list(suser,session_users,False))
    {
      if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring))
	DEBUG(1,("Too many session users??\n"));
      else
	{
	  pstrcat(session_users," ");
	  pstrcat(session_users,suser);
	}
    }
}


/****************************************************************************
update the encrypted smbpasswd file from the plaintext username and password
*****************************************************************************/
static BOOL update_smbpassword_file(char *user, char *password)
{
	SAM_ACCOUNT 	*sampass = NULL;
	BOOL 		ret;
	
	become_root();
	sampass = pdb_getsampwnam(user);
	unbecome_root();

	if(sampass == NULL) {
		DEBUG(0,("pdb_getsampwnam returned NULL\n"));
		return False;
	}

	/*
	 * Remove the account disabled flag - we are updating the
	 * users password from a login.
	 */
	pdb_set_acct_ctrl(sampass, pdb_get_acct_ctrl(sampass) & ~ACB_DISABLED);

	/* Here, the flag is one, because we want to ignore the
           XXXXXXX'd out password */
	ret = change_oem_password( sampass, password, True);
	if (ret == False) {
		DEBUG(3,("change_oem_password returned False\n"));
	}

	return ret;
}

/****************************************************************************
core of smb password checking routine.
****************************************************************************/
BOOL smb_password_check(char *password, unsigned char *part_passwd, unsigned char *c8)
{
  /* Finish the encryption of part_passwd. */
  unsigned char p21[21];
  unsigned char p24[24];

  if (part_passwd == NULL) 
  {
    DEBUG(10,("No password set - allowing access\n"));

    /* No password set - always true ! */
    return 1;
  }

  memset(p21,'\0',21);
  memcpy(p21,part_passwd,16);
  E_P24(p21, c8, p24);
#if DEBUG_PASSWORD
  {
    int i;
    DEBUG(100,("Part password (P16) was |"));
    for(i = 0; i < 16; i++)
      DEBUG(100,("%X ", (unsigned char)part_passwd[i]));
    DEBUG(100,("|\n"));
    DEBUG(100,("Password from client was |"));
    for(i = 0; i < 24; i++)
      DEBUG(100,("%X ", (unsigned char)password[i]));
    DEBUG(100,("|\n"));
    DEBUG(100,("Given challenge was |"));
    for(i = 0; i < 8; i++)
      DEBUG(100,("%X ", (unsigned char)c8[i]));
    DEBUG(100,("|\n"));
    DEBUG(100,("Value from encryption was |"));
    for(i = 0; i < 24; i++)
      DEBUG(100,("%X ", (unsigned char)p24[i]));
    DEBUG(100,("|\n"));
  }
#endif
  return (memcmp(p24, password, 24) == 0);
}

/****************************************************************************
 Do a specific test for an smb password being correct, given a smb_password and
 the lanman and NT responses.
****************************************************************************/
BOOL smb_password_ok(SAM_ACCOUNT *sampass, uchar chal[8],
                     uchar lm_pass[24], uchar nt_pass[24])
{
	uchar challenge[8];
	char* user_name;
	uint8 *nt_pw, *lm_pw;

	if (!lm_pass || !sampass) 
		return(False);

	user_name = pdb_get_username(sampass);
	
	DEBUG(4,("smb_password_ok: Checking SMB password for user %s\n",user_name));

	if(pdb_get_acct_ctrl(sampass) & ACB_DISABLED) {
		DEBUG(1,("smb_password_ok: account for user %s was disabled.\n", user_name));
		return(False);
	}

	if (chal == NULL) {
		DEBUG(5,("smb_password_ok: use last SMBnegprot challenge\n"));
		if (!last_challenge(challenge)) {
			DEBUG(1,("smb_password_ok: no challenge done - password failed\n"));
			return False;
		}
	} else {
		DEBUG(5,("smb_password_ok: challenge received\n"));
		memcpy(challenge, chal, 8);
	}

	nt_pw = pdb_get_nt_passwd(sampass);
	
	if ((Protocol >= PROTOCOL_NT1) && (nt_pw != NULL)) {
		/* We have the NT MD4 hash challenge available - see if we can
		   use it (ie. does it exist in the smbpasswd file).
		*/
		DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
		if (smb_password_check((char *)nt_pass, (uchar *)nt_pw, challenge)) {
			DEBUG(4,("smb_password_ok: NT MD4 password check succeeded\n"));
			return(True);
		}
		DEBUG(4,("smb_password_ok: NT MD4 password check failed\n"));
	}

	/* Try against the lanman password. pdb_get_lanman_passwd(sampass) == NULL 
	   means no password, allow access. */

	lm_pw = pdb_get_lanman_passwd(sampass);
	
	if((lm_pw == NULL) && (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) 
	{
		DEBUG(4,("smb_password_ok: no password required for user %s\n",user_name));
		return True;
	}

	if(lp_lanman_auth() && (lm_pw != NULL)) {
		DEBUG(4,("smb_password_ok: Checking LM password\n"));
		if(smb_password_check((char *)lm_pass,(uchar *)lm_pw, challenge)) {
			DEBUG(4,("smb_password_ok: LM password check succeeded\n"));
			return(True);
		}
		DEBUG(4,("smb_password_ok: LM password check failed\n"));
	}

	return False;
}


/****************************************************************************
check if a username/password is OK assuming the password is a 24 byte
SMB hash
return True if the password is correct, False otherwise
****************************************************************************/

BOOL pass_check_smb(char *user, char *domain, uchar *chal, 
                    uchar *lm_pwd, uchar *nt_pwd, struct passwd *pwd)
{
	struct passwd *pass;
	SAM_ACCOUNT *sampass;

	if (!lm_pwd || !nt_pwd)
	{
		return(False);
	}

	/* FIXME! this code looks to be unnecessary now that the passdb
	   validates that the username exists and has a valid uid */
	if (pwd != NULL && user == NULL)
	{
		pass = (struct passwd *) pwd;
		user = pass->pw_name;
	}
	else
	{
		/* I don't get this call here.  I think it should be moved.
		   Need to check on it.     --jerry */
		pass = smb_getpwnam(user,True);
	}

	if (pass == NULL)
	{
		DEBUG(1,("Couldn't find user '%s' in UNIX password database.\n",user));
		return(False);
	}

	/* get the account information */
	sampass = pdb_getsampwnam(user);
	if (sampass == NULL)
	{
		DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user));
		return(False);
	}

	/* Quit if the account was disabled. */
	if(pdb_get_acct_ctrl(sampass) & ACB_DISABLED) {
		DEBUG(1,("Account for user '%s' was disabled.\n", user));
		return(False);
	}

	/* Ensure the uid's match 
	   FIXME!  This also seems unnecessary --jerry */
#if 0	/* GWC */
	if (smb_pass->smb_userid != pass->pw_uid)
	{
		DEBUG(0,("Error : UNIX and SMB uids in password files do not match for user '%s'!\n", user));
		return(False);
	}
#endif

	if (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) 
	{
		if (lp_null_passwords()) 
		{
			DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", user));
			return(True);
		} 
		else 
		{
			DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", user));
			return(False);
		}		
	}

	if (smb_password_ok(sampass, chal, lm_pwd, nt_pwd))
	{
		return(True);
	}
	
	DEBUG(2,("pass_check_smb failed - invalid password for user [%s]\n", user));
	return False;
}

/****************************************************************************
check if a username/password pair is OK either via the system password
database or the encrypted SMB password database
return True if the password is correct, False otherwise
****************************************************************************/
BOOL password_ok(char *user, char *password, int pwlen, struct passwd *pwd)
{
	BOOL ret;

	if ((pwlen == 0) && !lp_null_passwords()) {
		DEBUG(4,("Null passwords not allowed.\n"));
		return False;
	}

	if (pwlen == 24 || (lp_encrypted_passwords() && (pwlen == 0) && lp_null_passwords())) {
		/* if 24 bytes long assume it is an encrypted password */
		uchar challenge[8];

		if (!last_challenge(challenge)) {
			DEBUG(0,("Error: challenge not done for user=%s\n", user));
			return False;
		}

		ret = pass_check_smb(user, global_myworkgroup,
		                      challenge, (uchar *)password, (uchar *)password, pwd);

		/*
		 * Try with PAM (may not be compiled in - returns True if not. JRA).
		 * FIXME ! Should this be called if we're using winbindd ? What about
		 * non-local accounts ? JRA.
		 */

		if (ret)
			return smb_pam_accountcheck(user);
	} 

	return pass_check(user, password, pwlen, pwd, 
			  lp_update_encrypted() ? 
			  update_smbpassword_file : NULL);
}

/****************************************************************************
check if a username is valid
****************************************************************************/
BOOL user_ok(char *user,int snum)
{
	pstring valid, invalid;
	BOOL ret;

	StrnCpy(valid, lp_valid_users(snum), sizeof(pstring)-1);
	StrnCpy(invalid, lp_invalid_users(snum), sizeof(pstring)-1);

	pstring_sub(valid,"%S",lp_servicename(snum));
	pstring_sub(invalid,"%S",lp_servicename(snum));
	
	ret = !user_in_list(user,invalid);
	
	if (ret && valid && *valid) {
		ret = user_in_list(user,valid);
	}

	if (ret && lp_onlyuser(snum)) {
		char *user_list = lp_username(snum);
		pstring_sub(user_list,"%S",lp_servicename(snum));
		ret = user_in_list(user,user_list);
	}

	return(ret);
}




/****************************************************************************
validate a group username entry. Return the username or NULL
****************************************************************************/
static char *validate_group(char *group,char *password,int pwlen,int snum)
{
#ifdef HAVE_NETGROUP
	{
		char *host, *user, *domain;
		setnetgrent(group);
		while (getnetgrent(&host, &user, &domain)) {
			if (user) {
				if (user_ok(user, snum) && 
				    password_ok(user,password,pwlen,NULL)) {
					endnetgrent();
					return(user);
				}
			}
		}
		endnetgrent();
	}
#endif
  
#ifdef HAVE_GETGRENT
	{
		struct group *gptr;
		setgrent();
		while ((gptr = (struct group *)getgrent())) {
			if (strequal(gptr->gr_name,group))
				break;
		}

		/*
		 * As user_ok can recurse doing a getgrent(), we must
		 * copy the member list into a pstring on the stack before
		 * use. Bug pointed out by leon@eatworms.swmed.edu.
		 */

		if (gptr) {
			pstring member_list;
			char *member;
			size_t copied_len = 0;
			int i;

			*member_list = '\0';
			member = member_list;

			for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
				size_t member_len = strlen(gptr->gr_mem[i]) + 1;
				if( copied_len + member_len < sizeof(pstring)) { 

					DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i]));

					safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1);
					copied_len += member_len;
					member += copied_len;
				} else {
					*member = '\0';
				}
			}

			endgrent();

			member = member_list;
			while (*member) {
				static fstring name;
				fstrcpy(name,member);
				if (user_ok(name,snum) &&
				    password_ok(name,password,pwlen,NULL)) {
					endgrent();
					return(&name[0]);
				}

				DEBUG(10,("validate_group = member = %s\n", member));

				member += strlen(member) + 1;
			}
		} else {
			endgrent();
			return NULL;
		}
	}
#endif
	return(NULL);
}



/****************************************************************************
check for authority to login to a service with a given username/password
****************************************************************************/
BOOL authorise_login(int snum,char *user,char *password, int pwlen, 
		     BOOL *guest,BOOL *force,uint16 vuid)
{
  BOOL ok = False;
  user_struct *vuser = get_valid_user_struct(vuid);

  if (lp_security() > SEC_SHARE && !vuser) {
	  DEBUG(1,("authorise_login: refusing user %s with no session setup\n",
		   user));
	  return False;
  }
  
  *guest = False;
  
#if DEBUG_PASSWORD
  DEBUG(100,("checking authorisation on user=%s pass=%s\n",user,password));
#endif

  /* there are several possibilities:
     1) login as the given user with given password
     2) login as a previously registered username with the given password
     3) login as a session list username with the given password
     4) login as a previously validated user/password pair
     5) login as the "user =" user with given password
     6) login as the "user =" user with no password (guest connection)
     7) login as guest user with no password

     if the service is guest_only then steps 1 to 5 are skipped
  */

  if (GUEST_ONLY(snum)) *force = True;

  if (!(GUEST_ONLY(snum) && GUEST_OK(snum)))
    {
      /* check the given username and password */
      if (!ok && (*user) && user_ok(user,snum)) {
	ok = password_ok(user,password, pwlen, NULL);
	if (ok) DEBUG(3,("ACCEPTED: given username password ok\n"));
      }

      /* check for a previously registered guest username */
      if (!ok && (vuser != 0) && vuser->guest) {	  
	if (user_ok(vuser->user.unix_name,snum) &&
	    password_ok(vuser->user.unix_name, password, pwlen, NULL)) {
	  fstrcpy(user, vuser->user.unix_name);
	  vuser->guest = False;
	  DEBUG(3,("ACCEPTED: given password with registered user %s\n", user));
	  ok = True;
	}
      }


      /* now check the list of session users */
    if (!ok)
    {
      char *auser;
      char *user_list = strdup(session_users);
      if (!user_list) return(False);

      for (auser=strtok(user_list,LIST_SEP); 
           !ok && auser; 
           auser = strtok(NULL,LIST_SEP))
      {
        fstring user2;
        fstrcpy(user2,auser);
        if (!user_ok(user2,snum)) continue;
		  
        if (password_ok(user2,password, pwlen, NULL)) {
          ok = True;
          fstrcpy(user,user2);
          DEBUG(3,("ACCEPTED: session list username and given password ok\n"));
        }
      }
      free(user_list);
    }

    /* check for a previously validated username/password pair */
    if (!ok && (lp_security() > SEC_SHARE) &&
        (vuser != 0) && !vuser->guest &&
        user_ok(vuser->user.unix_name,snum)) {
      fstrcpy(user,vuser->user.unix_name);
      *guest = False;
      DEBUG(3,("ACCEPTED: validated uid ok as non-guest\n"));
      ok = True;
    }

      /* check for a rhosts entry */
      if (!ok && user_ok(user,snum) && check_hosts_equiv(user)) {
	ok = True;
	DEBUG(3,("ACCEPTED: hosts equiv or rhosts entry\n"));
      }

      /* check the user= fields and the given password */
      if (!ok && lp_username(snum)) {
	char *auser;
	pstring user_list;
	StrnCpy(user_list,lp_username(snum),sizeof(pstring));

	pstring_sub(user_list,"%S",lp_servicename(snum));
	  
	for (auser=strtok(user_list,LIST_SEP);
	     auser && !ok;
	     auser = strtok(NULL,LIST_SEP))
	  {
	    if (*auser == '@')
	      {
		auser = validate_group(auser+1,password,pwlen,snum);
		if (auser)
		  {
		    ok = True;
		    fstrcpy(user,auser);
		    DEBUG(3,("ACCEPTED: group username and given password ok\n"));
		  }
	      }
	    else
	      {
		fstring user2;
		fstrcpy(user2,auser);
		if (user_ok(user2,snum) && 
		    password_ok(user2,password,pwlen,NULL))
		  {
		    ok = True;
		    fstrcpy(user,user2);
		    DEBUG(3,("ACCEPTED: user list username and given password ok\n"));
		  }
	      }
	  }
      }      
    } /* not guest only */

  /* check for a normal guest connection */
  if (!ok && GUEST_OK(snum))
    {
      fstring guestname;
      StrnCpy(guestname,lp_guestaccount(snum),sizeof(guestname)-1);
      if (Get_Pwnam(guestname,True))
	{
	  fstrcpy(user,guestname);
	  ok = True;
	  DEBUG(3,("ACCEPTED: guest account and guest ok\n"));
	}
      else
	DEBUG(0,("Invalid guest account %s??\n",guestname));
      *guest = True;
    }

  if (ok && !user_ok(user,snum))
    {
      DEBUG(0,("rejected invalid user %s\n",user));
      ok = False;
    }

  return(ok);
}


/****************************************************************************
read the a hosts.equiv or .rhosts file and check if it
allows this user from this machine
****************************************************************************/
static BOOL check_user_equiv(char *user, char *remote, char *equiv_file)
{
  int plus_allowed = 1;
  char *file_host;
  char *file_user;
  char **lines = file_lines_load(equiv_file, NULL, False);
  int i;

  DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file));
  if (! lines) return False;
  for (i=0; lines[i]; i++) {
    char *buf = lines[i];
    trim_string(buf," "," ");

    if (buf[0] != '#' && buf[0] != '\n') 
    {
      BOOL is_group = False;
      int plus = 1;
      char *bp = buf;
      if (strcmp(buf, "NO_PLUS\n") == 0)
      {
	DEBUG(6, ("check_user_equiv NO_PLUS\n"));
	plus_allowed = 0;
      }
      else {
	if (buf[0] == '+') 
	{
	  bp++;
	  if (*bp == '\n' && plus_allowed) 
	  {
	    /* a bare plus means everbody allowed */
	    DEBUG(6, ("check_user_equiv everybody allowed\n"));
	    file_lines_free(lines);
	    return True;
	  }
	}
	else if (buf[0] == '-')
	{
	  bp++;
	  plus = 0;
	}
	if (*bp == '@') 
	{
	  is_group = True;
	  bp++;
	}
	file_host = strtok(bp, " \t\n");
	file_user = strtok(NULL, " \t\n");
	DEBUG(7, ("check_user_equiv %s %s\n", file_host ? file_host : "(null)", 
                 file_user ? file_user : "(null)" ));
	if (file_host && *file_host) 
	{
	  BOOL host_ok = False;

#if defined(HAVE_NETGROUP) && defined(HAVE_YP_GET_DEFAULT_DOMAIN)
	  if (is_group)
	    {
	      static char *mydomain = NULL;
	      if (!mydomain)
		yp_get_default_domain(&mydomain);
	      if (mydomain && innetgr(file_host,remote,user,mydomain))
		host_ok = True;
	    }
#else
	  if (is_group)
	    {
	      DEBUG(1,("Netgroups not configured\n"));
	      continue;
	    }
#endif

	  /* is it this host */
	  /* the fact that remote has come from a call of gethostbyaddr
	   * means that it may have the fully qualified domain name
	   * so we could look up the file version to get it into
	   * a canonical form, but I would rather just type it
	   * in full in the equiv file
	   */
	  if (!host_ok && !is_group && strequal(remote, file_host))
	    host_ok = True;

	  if (!host_ok)
	    continue;

	  /* is it this user */
	  if (file_user == 0 || strequal(user, file_user)) 
	    {
	      DEBUG(5, ("check_user_equiv matched %s%s %s\n",
			(plus ? "+" : "-"), file_host,
			(file_user ? file_user : "")));
	      file_lines_free(lines);
	      return (plus ? True : False);
	    }
	}
      }
    }
  }
  file_lines_free(lines);
  return False;
}


/****************************************************************************
check for a possible hosts equiv or rhosts entry for the user
****************************************************************************/
BOOL check_hosts_equiv(char *user)
{
  char *fname = NULL;
  pstring rhostsfile;
  struct passwd *pass = Get_Pwnam(user,True);

  if (!pass) 
    return(False);

  fname = lp_hosts_equiv();

  /* note: don't allow hosts.equiv on root */
  if (fname && *fname && (pass->pw_uid != 0)) {
	  if (check_user_equiv(user,client_name(),fname))
		  return(True);
  }
  
  if (lp_use_rhosts())
    {
      char *home = get_user_home_dir(user);
      if (home) {
	      slprintf(rhostsfile, sizeof(rhostsfile)-1, "%s/.rhosts", home);
	      if (check_user_equiv(user,client_name(),rhostsfile))
		      return(True);
      }
    }

  return(False);
}


/****************************************************************************
 Return the client state structure.
****************************************************************************/

struct cli_state *server_client(void)
{
	static struct cli_state pw_cli;
	return &pw_cli;
}

/****************************************************************************
 Support for server level security.
****************************************************************************/

struct cli_state *server_cryptkey(void)
{
	struct cli_state *cli;
	fstring desthost;
	struct in_addr dest_ip;
	char *p, *pserver;
	BOOL connected_ok = False;

	cli = server_client();

	if (!cli_initialise(cli))
		return NULL;

        pserver = strdup(lp_passwordserver());
	p = pserver;

        while(next_token( &p, desthost, LIST_SEP, sizeof(desthost))) {
		standard_sub_basic(desthost);
		strupper(desthost);

		if(!resolve_name( desthost, &dest_ip, 0x20)) {
			DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost));
			continue;
		}

		if (ismyip(dest_ip)) {
			DEBUG(1,("Password server loop - disabling password server %s\n",desthost));
			continue;
		}

		if (cli_connect(cli, desthost, &dest_ip)) {
			DEBUG(3,("connected to password server %s\n",desthost));
			connected_ok = True;
			break;
		}
	}

	free(pserver);

	if (!connected_ok) {
		DEBUG(0,("password server not available\n"));
		cli_shutdown(cli);
		return NULL;
	}

	if (!attempt_netbios_session_request(cli, global_myname, desthost, &dest_ip))
		return NULL;

	DEBUG(3,("got session\n"));

	if (!cli_negprot(cli)) {
		DEBUG(1,("%s rejected the negprot\n",desthost));
		cli_shutdown(cli);
		return NULL;
	}

	if (cli->protocol < PROTOCOL_LANMAN2 ||
	    !(cli->sec_mode & 1)) {
		DEBUG(1,("%s isn't in user level security mode\n",desthost));
		cli_shutdown(cli);
		return NULL;
	}

	DEBUG(3,("password server OK\n"));

	return cli;
}

/****************************************************************************
 Validate a password with the password server.
****************************************************************************/

BOOL server_validate(char *user, char *domain, 
		     char *pass, int passlen,
		     char *ntpass, int ntpasslen)
{
  struct cli_state *cli;
  static unsigned char badpass[24];
  static BOOL tested_password_server = False;
  static BOOL bad_password_server = False;

  cli = server_client();

  if (!cli->initialised) {
    DEBUG(1,("password server %s is not connected\n", cli->desthost));
    return(False);
  }  

  if(badpass[0] == 0)
    memset(badpass, 0x1f, sizeof(badpass));

  if((passlen == sizeof(badpass)) && !memcmp(badpass, pass, passlen)) {
    /* 
     * Very unlikely, our random bad password is the same as the users
     * password. */
    memset(badpass, badpass[0]+1, sizeof(badpass));
  }

  /*
   * Attempt a session setup with a totally incorrect password.
   * If this succeeds with the guest bit *NOT* set then the password
   * server is broken and is not correctly setting the guest bit. We
   * need to detect this as some versions of NT4.x are broken. JRA.
   */

  if(!tested_password_server) {
    if (cli_session_setup(cli, user, (char *)badpass, sizeof(badpass), 
                              (char *)badpass, sizeof(badpass), domain)) {

      /*
       * We connected to the password server so we
       * can say we've tested it.
       */
      tested_password_server = True;

      if ((SVAL(cli->inbuf,smb_vwv2) & 1) == 0) {
        DEBUG(0,("server_validate: password server %s allows users as non-guest \
with a bad password.\n", cli->desthost));
        DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \
use this machine as the password server.\n"));
        cli_ulogoff(cli);

        /*
         * Password server has the bug.
         */
        bad_password_server = True;
        return False;
      }
      cli_ulogoff(cli);
    }
  } else {

    /*
     * We have already tested the password server.
     * Fail immediately if it has the bug.
     */

    if(bad_password_server) {
      DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \
with a bad password.\n", cli->desthost));
      DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \
use this machine as the password server.\n"));
      return False;
    }
  }

  /*
   * Now we know the password server will correctly set the guest bit, or is
   * not guest enabled, we can try with the real password.
   */

  if (!cli_session_setup(cli, user, pass, passlen, ntpass, ntpasslen, domain)) {
    DEBUG(1,("password server %s rejected the password\n", cli->desthost));
    return False;
  }

  /* if logged in as guest then reject */
  if ((SVAL(cli->inbuf,smb_vwv2) & 1) != 0) {
    DEBUG(1,("password server %s gave us guest only\n", cli->desthost));
    cli_ulogoff(cli);
    return(False);
  }

  cli_ulogoff(cli);

  return(True);
}

/***********************************************************************
 Connect to a remote machine for domain security authentication
 given a name or IP address.
************************************************************************/

static BOOL connect_to_domain_password_server(struct cli_state *pcli, 
					      char *server,
                                              unsigned char *trust_passwd)
{
  struct in_addr dest_ip;
  fstring remote_machine;

  if(cli_initialise(pcli) == False) {
    DEBUG(0,("connect_to_domain_password_server: unable to initialize client connection.\n"));
    return False;
  }

  if (is_ipaddress(server)) {
	  struct in_addr to_ip;
	  
	  /* we shouldn't have 255.255.255.255 forthe IP address of 
	     a password server anyways */
	  if ((to_ip.s_addr=inet_addr(server)) == 0xFFFFFFFF) {
	  	DEBUG (0,("connect_to_domain_password_server: inet_addr(%s) returned 0xFFFFFFFF!\n", server));
	  	return False;
	  }

	  if (!name_status_find(0x20, to_ip, remote_machine)) {
		  DEBUG(0, ("connect_to_domain_password_server: Can't "
			    "resolve name for IP %s\n", server));
		  return False;
	  }
  } else {
	  fstrcpy(remote_machine, server);
  }

  standard_sub_basic(remote_machine);
  strupper(remote_machine);

  if(!resolve_name( remote_machine, &dest_ip, 0x20)) {
    DEBUG(1,("connect_to_domain_password_server: Can't resolve address for %s\n", remote_machine));
    cli_shutdown(pcli);
    return False;
  }
  
  if (ismyip(dest_ip)) {
    DEBUG(1,("connect_to_domain_password_server: Password server loop - not using password server %s\n",
         remote_machine));
    cli_shutdown(pcli);
    return False;
  }
  
  if (!cli_connect(pcli, remote_machine, &dest_ip)) {
    DEBUG(0,("connect_to_domain_password_server: unable to connect to SMB server on \
machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
    cli_shutdown(pcli);
    return False;
  }
  
  if (!attempt_netbios_session_request(pcli, global_myname, remote_machine, &dest_ip)) {
    DEBUG(0,("connect_to_password_server: machine %s rejected the NetBIOS \
session request. Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
    return False;
  }
  
  pcli->protocol = PROTOCOL_NT1;

  if (!cli_negprot(pcli)) {
    DEBUG(0,("connect_to_domain_password_server: machine %s rejected the negotiate protocol. \
Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
    cli_shutdown(pcli);
    return False;
  }

  if (pcli->protocol != PROTOCOL_NT1) {
    DEBUG(0,("connect_to_domain_password_server: machine %s didn't negotiate NT protocol.\n",
                   remote_machine));
    cli_shutdown(pcli);
    return False;
  }

  /*
   * Do an anonymous session setup.
   */

  if (!cli_session_setup(pcli, "", "", 0, "", 0, "")) {
    DEBUG(0,("connect_to_domain_password_server: machine %s rejected the session setup. \
Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
    cli_shutdown(pcli);
    return False;
  }

  if (!(pcli->sec_mode & 1)) {
    DEBUG(1,("connect_to_domain_password_server: machine %s isn't in user level security mode\n",
               remote_machine));
    cli_shutdown(pcli);
    return False;
  }

  if (!cli_send_tconX(pcli, "IPC$", "IPC", "", 1)) {
    DEBUG(0,("connect_to_domain_password_server: machine %s rejected the tconX on the IPC$ share. \
Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
    cli_shutdown(pcli);
    return False;
  }

  /*
   * We now have an anonymous connection to IPC$ on the domain password server.
   */

  /*
   * Even if the connect succeeds we need to setup the netlogon
   * pipe here. We do this as we may just have changed the domain
   * account password on the PDC and yet we may be talking to
   * a BDC that doesn't have this replicated yet. In this case
   * a successful connect to a DC needs to take the netlogon connect
   * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
   */

  if(cli_nt_session_open(pcli, PIPE_NETLOGON) == False) {
    DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli)));
    cli_nt_session_close(pcli);
    cli_ulogoff(pcli);
    cli_shutdown(pcli);
    return False;
  }

  if (cli_nt_setup_creds(pcli, trust_passwd) == False) {
    DEBUG(0,("connect_to_domain_password_server: unable to setup the PDC credentials to machine \
%s. Error was : %s.\n", remote_machine, cli_errstr(pcli)));
    cli_nt_session_close(pcli);
    cli_ulogoff(pcli);
    cli_shutdown(pcli);
    return(False);
  }

  return True;
}

/***********************************************************************
 Utility function to attempt a connection to an IP address of a DC.
************************************************************************/

static BOOL attempt_connect_to_dc(struct cli_state *pcli, struct in_addr *ip, unsigned char *trust_passwd)
{
  fstring dc_name;

  /*
   * Ignore addresses we have already tried.
   */

  if (ip_equal(ipzero, *ip))
	  return False;

  if (!lookup_pdc_name(global_myname, lp_workgroup(), ip, dc_name))
	  return False;

  return connect_to_domain_password_server(pcli, dc_name, trust_passwd);
}



/***********************************************************************
 We have been asked to dynamcially determine the IP addresses of
 the PDC and BDC's for this DOMAIN, and query them in turn.
************************************************************************/
static BOOL find_connect_pdc(struct cli_state *pcli, unsigned char *trust_passwd, time_t last_change_time)
{
	struct in_addr *ip_list = NULL;
	int count = 0;
	int i;
	BOOL connected_ok = False;
	time_t time_now = time(NULL);
	BOOL use_pdc_only = False;

	/*
	 * If the time the machine password has changed
	 * was less than an hour ago then we need to contact
	 * the PDC only, as we cannot be sure domain replication
	 * has yet taken place. Bug found by Gerald (way to go
	 * Gerald !). JRA.
	 */

	if (time_now - last_change_time < 3600)
		use_pdc_only = True;

	if (!get_dc_list(use_pdc_only, lp_workgroup(), &ip_list, &count))
		return False;

	/*
	 * Firstly try and contact a PDC/BDC who has the same
	 * network address as any of our interfaces.
	 */
	for(i = 0; i < count; i++) {
		if(!is_local_net(ip_list[i]))
			continue;

		if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) 
			break;
		
		ip_list[i] = ipzero; /* Tried and failed. */
	}

	/*
	 * Secondly try and contact a random PDC/BDC.
	 */
	if(!connected_ok) {
		i = (sys_random() % count);

		if (!(connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd)))
			ip_list[i] = ipzero; /* Tried and failed. */
	}

	/*
	 * Finally go through the IP list in turn, ignoring any addresses
	 * we have already tried.
	 */
	if(!connected_ok) {
		/*
		 * Try and connect to any of the other IP addresses in the PDC/BDC list.
		 * Note that from a WINS server the #1 IP address is the PDC.
		 */
		for(i = 0; i < count; i++) {
			if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd)))
				break;
		}
	}

	if(ip_list != NULL)
		free((char *)ip_list);


	return connected_ok;
}



/***********************************************************************
 Do the same as security=server, but using NT Domain calls and a session
 key from the machine password.
************************************************************************/

BOOL domain_client_validate( char *user, char *domain, 
                             char *smb_apasswd, int smb_apasslen, 
                             char *smb_ntpasswd, int smb_ntpasslen,
                             BOOL *user_exists)
{
  unsigned char local_challenge[8];
  unsigned char local_lm_response[24];
  unsigned char local_nt_response[24];
  unsigned char trust_passwd[16];
  fstring remote_machine;
  char *p, *pserver;
  NET_ID_INFO_CTR ctr;
  NET_USER_INFO_3 info3;
  struct cli_state cli;
  uint32 smb_uid_low;
  BOOL connected_ok = False;
  time_t last_change_time;

  if(user_exists != NULL)
    *user_exists = True; /* Only set false on a very specific error. */
 
  /* 
   * Check that the requested domain is not our own machine name.
   * If it is, we should never check the PDC here, we use our own local
   * password file.
   */

  if(strequal( domain, global_myname)) {
    DEBUG(3,("domain_client_validate: Requested domain was for this machine.\n"));
    return False;
  }

  /*
   * Next, check that the passwords given were encrypted.
   */

  if(((smb_apasslen != 24) && (smb_apasslen != 0)) || 
     ((smb_ntpasslen != 24) && (smb_ntpasslen != 0))) {

    /*
     * Not encrypted - do so.
     */

    DEBUG(3,("domain_client_validate: User passwords not in encrypted format.\n"));
    generate_random_buffer( local_challenge, 8, False);
    SMBencrypt( (uchar *)smb_apasswd, local_challenge, local_lm_response);
    SMBNTencrypt((uchar *)smb_ntpasswd, local_challenge, local_nt_response);
    smb_apasslen = 24;
    smb_ntpasslen = 24;
    smb_apasswd = (char *)local_lm_response;
    smb_ntpasswd = (char *)local_nt_response;
  } else {

    /*
     * Encrypted - get the challenge we sent for these
     * responses.
     */

    if (!last_challenge(local_challenge)) {
      DEBUG(0,("domain_client_validate: no challenge done - password failed\n"));
      return False;
    }
  }

  /*
   * Get the machine account password for our primary domain
   */
  if (!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd, &last_change_time))
  {
	  DEBUG(0, ("domain_client_validate: could not fetch trust account password for domain %s\n", lp_workgroup()));
	  return False;
  }

  /*
   * At this point, smb_apasswd points to the lanman response to
   * the challenge in local_challenge, and smb_ntpasswd points to
   * the NT response to the challenge in local_challenge. Ship
   * these over the secure channel to a domain controller and
   * see if they were valid.
   */

  ZERO_STRUCT(cli);

  /*
   * Treat each name in the 'password server =' line as a potential
   * PDC/BDC. Contact each in turn and try and authenticate.
   */

  pserver = lp_passwordserver();
  if (! *pserver) pserver = "*";
  p = pserver;

  while (!connected_ok &&
	 next_token(&p,remote_machine,LIST_SEP,sizeof(remote_machine))) {
	  if(strequal(remote_machine, "*")) {
		  connected_ok = find_connect_pdc(&cli, trust_passwd, last_change_time);
	  } else {
		  connected_ok = connect_to_domain_password_server(&cli, remote_machine, trust_passwd);
	  }
  }

  if (!connected_ok) {
    DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
    cli_shutdown(&cli);
    return False;
  }

  /* We really don't care what LUID we give the user. */
  generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);

  ZERO_STRUCT(info3);

  if(cli_nt_login_network(&cli, domain, user, smb_uid_low, (char *)local_challenge,
                          ((smb_apasslen != 0) ? smb_apasswd : NULL),
                          ((smb_ntpasslen != 0) ? smb_ntpasswd : NULL),
                          &ctr, &info3) == False) {
    uint32 nt_rpc_err;

    cli_error(&cli, NULL, NULL, &nt_rpc_err);
    DEBUG(0,("domain_client_validate: unable to validate password for user %s in domain \
%s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli)));
    cli_nt_session_close(&cli);
    cli_ulogoff(&cli);
    cli_shutdown(&cli);

    if((nt_rpc_err == NT_STATUS_NO_SUCH_USER) && (user_exists != NULL))
      *user_exists = False;

    return False;
  }

  /*
   * Here, if we really want it, we have lots of info about the user in info3.
   */

#if 0
  /* 
   * We don't actually need to do this - plus it fails currently with
   * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to
   * send here. JRA.
   */

  if(cli_nt_logoff(&cli, &ctr) == False) {
    DEBUG(0,("domain_client_validate: unable to log off user %s in domain \
%s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli)));        
    cli_nt_session_close(&cli);
    cli_ulogoff(&cli);
    cli_shutdown(&cli);
    return False;
  }
#endif /* 0 */

  /* Note - once the cli stream is shutdown the mem_ctx used
   to allocate the other_sids and gids structures has been deleted - so
   these pointers are no longer valid..... */

  cli_nt_session_close(&cli);
  cli_ulogoff(&cli);
  cli_shutdown(&cli);
  return True;
}