summaryrefslogtreecommitdiff
path: root/source3/smbd/password.c
blob: f4d94791cf37876d037e9c904d9bcb786a0b0287 (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
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Password and authentication handling
   Copyright (C) Andrew Tridgell 1992-1997
   
   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"

#if (defined(NETGROUP) && defined (AUTOMOUNT))
#include "rpcsvc/ypclnt.h"
#endif

extern int DEBUGLEVEL;
extern int Protocol;

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

/* these are kept here to keep the string_combinations function simple */
static char this_user[100]="";
static char this_salt[100]="";
static char this_crypted[100]="";

/* 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)
{
	unsigned char buf[16];
	static int counter = 0;
	struct timeval tval;
	int v1,v2;

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

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

	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(char *challenge)
{
  memcpy(saved_challenge,challenge,8);
  challenge_sent = True;
  return(True);
}

/*******************************************************************
get the last challenge sent
********************************************************************/
BOOL last_challenge(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 = NULL;
static int num_validated_users = 0;

/****************************************************************************
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)
{
  if(vuid == UID_FIELD_INVALID)
    return NULL;
  vuid -= VUID_OFFSET;
  if((vuid >= (uint16)num_validated_users) || 
     (validated_users[vuid].uid == -1) || (validated_users[vuid].gid == -1))
    return NULL;
  return &validated_users[vuid];
}

/****************************************************************************
invalidate a uid
****************************************************************************/
void invalidate_vuid(uint16 vuid)
{
  user_struct *vuser = get_valid_user_struct(vuid);
  if(vuser == 0)
    return;

  vuser->uid = -1;
  vuser->gid = -1;
  vuser->user_ngroups = 0;
  if(vuser->user_groups && 
     (vuser->user_groups != (gid_t *)vuser->user_igroups))
       free(vuser->user_groups);
  vuser->user_groups = NULL;
  if(vuser->user_igroups)
    free(vuser->user_igroups);
  vuser->user_igroups = NULL;
}


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

/****************************************************************************
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.
****************************************************************************/
uint16 register_vuid(int uid,int gid, char *name,BOOL guest)
{
  user_struct *vuser;

#if (defined(NETGROUP) && defined (AUTOMOUNT))
  int nis_error;        /* returned by yp all functions */
  char *nis_result;     /* yp_match inits this */
  int nis_result_len;  /* and set this */
  char *nis_domain;     /* yp_get_default_domain inits this */
  char *nis_map = (char *)lp_nis_home_map_name();
  int home_server_len;
#endif
  struct passwd *pwfile; /* for getting real name from passwd file */
  int real_name_len;

#if 0
  /*
   * After observing MS-Exchange services writing to a Samba share
   * I belive this code is incorrect. Each service does it's own
   * sessionsetup_and_X for the same user, and as each service shuts
   * down, it does a user_logoff_and_X. As we are consolidating multiple
   * sessionsetup_and_X's onto the same vuid here, when the first service
   * shuts down, it invalidates all the open files for the other services.
   * Hence I am removing this code and forcing each sessionsetup_and_X
   * to get a new vuid.
   * Jeremy Allison. (jallison@whistle.com).
   */

  int i;
  for(i = 0; i < num_validated_users; i++) {
    vuser = &validated_users[i];
    if( vuser->uid == uid )
      return (uint16)(i + VUID_OFFSET); /* User already validated */
  }
#endif

  validated_users = (user_struct *)Realloc(validated_users,
			   sizeof(user_struct)*
			   (num_validated_users+1));
  
  if (!validated_users)
    {
      DEBUG(0,("Failed to realloc users struct!\n"));
      num_validated_users = 0;
      return UID_FIELD_INVALID;
    }

  vuser = &validated_users[num_validated_users];
  num_validated_users++;

  vuser->uid = uid;
  vuser->gid = gid;
  vuser->guest = guest;
  strcpy(vuser->name,name);

  vuser->user_ngroups = 0;
  vuser->user_groups = NULL;
  vuser->user_igroups = NULL;

  /* Find all the groups this uid is in and store them. 
     Used by become_user() */
  setup_groups(name,uid,gid,
	       &vuser->user_ngroups,
	       &vuser->user_igroups,
	       &vuser->user_groups);

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

#if (defined(NETGROUP) && defined (AUTOMOUNT))
  vuser->home_share = NULL;
  DEBUG(3, ("Setting default HOMESHR to: \\\\logon server\\HOMES\n"));
  vuser->home_share = Realloc(vuser->home_share, 32);
  strcpy(vuser->home_share,"\\\\%L\\HOMES");

  if (nis_error = yp_get_default_domain(&nis_domain))
    DEBUG(3, ("YP Error: %s\n", yperr_string(nis_error)));
  DEBUG(3, ("NIS Domain: %s\n", nis_domain));

  if (nis_error = yp_match(nis_domain, nis_map, vuser->name, strlen(vuser->name),
                        &nis_result, &nis_result_len))
    DEBUG(3, ("YP Error: %s\n", yperr_string(nis_error)));
  if (!nis_error && lp_nis_home_map()) {
    home_server_len = strcspn(nis_result,":");
    DEBUG(3, ("NIS lookup succeeded\n\tHome server length: %d\n",home_server_len));
    vuser->home_share = (char *)Realloc(vuser->home_share, home_server_len+12);
    DEBUG(3, ("\tAllocated %d bytes for HOMESHR\n",home_server_len+12 ));
    strcpy(vuser->home_share,"\\\\");
    strncat(vuser->home_share, nis_result, home_server_len);
    strcat(vuser->home_share,"\\homes");
    DEBUG(2,("\tUser = %s\n\tUID = %d\n\tNIS result = %s\n\tHOMESHR = %s\n",
           vuser->name, vuser->uid, nis_result, vuser->home_share));
  }
#endif

  vuser->real_name = NULL;
  DEBUG(3, ("Clearing default real name\n"));
  vuser->real_name = Realloc(vuser->real_name, 15);
  strcpy(vuser->real_name, "<Full Name>\0");
  if (lp_unix_realname()) {
    if((pwfile=getpwnam(vuser->name))!= NULL)
      {
      DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->name,pwfile->pw_gecos));
      real_name_len = strcspn(pwfile->pw_gecos, ",");
      DEBUG(3, ("Real name length: %d\n", real_name_len));
      vuser->real_name = (char *)Realloc(vuser->real_name, real_name_len+1);
      strncpy(vuser->real_name, pwfile->pw_gecos, real_name_len);
      vuser->real_name[real_name_len]='\0';
      }
  }

  return (uint16)((num_validated_users - 1) + VUID_OFFSET);
}


/****************************************************************************
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
	{
	  strcat(session_users," ");
	  strcat(session_users,suser);
	}
    }
}


#ifdef NO_GETSPNAM
/* a fake shadow password routine which just fills a fake spwd struct
 * with the sp_pwdp field. (sreiz@aie.nl)
 */
static struct spwd *getspnam(char *username) /* fake shadow password routine */
{
       FILE *f;
       char line[1024];
       static char pw[20];
       static struct spwd static_spwd;

       static_spwd.sp_pwdp=0;
       if (!(f=fopen("/etc/master.passwd", "r")))
               return 0;
       while (fgets(line, 1024, f)) {
               if (!strncmp(line, username, strlen(username)) &&
                line[strlen(username)]==':') { /* found entry */
                       char *p, *q;

                       p=line+strlen(username)+1;
                       if ((q=strchr(p, ':'))) {
                               *q=0;
                               if (q-p+1>20)
                                       break;
                               strcpy(pw, p);
                               static_spwd.sp_pwdp=pw;
                       }
                       break;
               }
       }
       fclose(f);
       if (static_spwd.sp_pwdp)
               return &static_spwd;
       return 0;
}
#endif


#ifdef OSF1_ENH_SEC
/****************************************************************************
an enhanced crypt for OSF1
****************************************************************************/
static char *osf1_bigcrypt(char *password,char *salt1)
{
  static char result[AUTH_MAX_PASSWD_LENGTH] = "";
  char *p1;
  char *p2=password;
  char salt[3];
  int i;
  int parts = strlen(password) / AUTH_CLEARTEXT_SEG_CHARS;
  if (strlen(password)%AUTH_CLEARTEXT_SEG_CHARS)
    parts++;

  StrnCpy(salt,salt1,2);
  StrnCpy(result,salt1,2);

  for (i=0; i<parts;i++)
    {
      p1 = crypt(p2,salt);
      strcat(result,p1+2);
      StrnCpy(salt,&result[2+i*AUTH_CIPHERTEXT_SEG_CHARS],2);
      p2 += AUTH_CLEARTEXT_SEG_CHARS;
    }

  return(result);
}
#endif


/****************************************************************************
update the enhanced security database. Only relevant for OSF1 at the moment.
****************************************************************************/
static void update_protected_database( char *user, BOOL result)
{
#ifdef OSF1_ENH_SEC
  struct pr_passwd *mypasswd;
  time_t starttime;

  mypasswd = getprpwnam (user);
  starttime = time (NULL);

  if (result)
    {
      mypasswd->ufld.fd_slogin = starttime;
      mypasswd->ufld.fd_nlogins = 0;
      
      putprpwnam(user,mypasswd);
      
      DEBUG(3,("Update protected database for Account %s after succesful connection\n",user));
    }
  else
    {
      mypasswd->ufld.fd_ulogin = starttime;
      mypasswd->ufld.fd_nlogins = mypasswd->ufld.fd_nlogins + 1;
      if ( mypasswd->ufld.fd_max_tries != 0 && mypasswd->ufld.fd_nlogins > mypasswd->ufld.fd_max_tries )
	{
	  mypasswd->uflg.fg_lock = 0;
	  DEBUG(3,("Account is disabled -- see Account Administrator.\n"));
	}
      putprpwnam ( user , mypasswd );
      DEBUG(3,("Update protected database for Account %s after refusing connection\n",user));
    }
#else
  DEBUG(6,("Updated database with %s %s\n",user,BOOLSTR(result)));
#endif
}


#ifdef USE_PAM
/*******************************************************************
check on PAM authentication
********************************************************************/

/* We first need some helper functions */
#include <security/pam_appl.h>
/* Static variables used to communicate between the conversation function
 * and the server_login function
 */
static char *PAM_username;
static char *PAM_password;

/* PAM conversation function
 * Here we assume (for now, at least) that echo on means login name, and
 * echo off means password.
 */
static int PAM_conv (int num_msg,
                     struct pam_message **msg,
                     struct pam_response **resp,
                     void *appdata_ptr) {
  int count = 0, replies = 0;
  struct pam_response *reply = NULL;
  int size = sizeof(struct pam_response);

  #define GET_MEM if (reply) realloc(reply, size); else reply = malloc(size); \
  if (!reply) return PAM_CONV_ERR; \
  size += sizeof(struct pam_response)
  #define COPY_STRING(s) (s) ? strdup(s) : NULL

  for (count = 0; count < num_msg; count++) {
    switch (msg[count]->msg_style) {
      case PAM_PROMPT_ECHO_ON:
        GET_MEM;
        reply[replies].resp_retcode = PAM_SUCCESS;
        reply[replies++].resp = COPY_STRING(PAM_username);
          /* PAM frees resp */
        break;
      case PAM_PROMPT_ECHO_OFF:
        GET_MEM;
        reply[replies].resp_retcode = PAM_SUCCESS;
        reply[replies++].resp = COPY_STRING(PAM_password);
          /* PAM frees resp */
        break;
      case PAM_TEXT_INFO:
        /* ignore it... */
        break;
      case PAM_ERROR_MSG:
      default:
        /* Must be an error of some sort... */
        free (reply);
        return PAM_CONV_ERR;
    }
  }
  if (reply) *resp = reply;
  return PAM_SUCCESS;
}
static struct pam_conv PAM_conversation = {
    &PAM_conv,
    NULL
};


static BOOL pam_auth(char *this_user,char *password)
{
  pam_handle_t *pamh;
  int pam_error;

  /* Now use PAM to do authentication.  For now, we won't worry about
   * session logging, only authentication.  Bail out if there are any
   * errors.  Since this is a limited protocol, and an even more limited
   * function within a server speaking this protocol, we can't be as
   * verbose as would otherwise make sense.
   * Query: should we be using PAM_SILENT to shut PAM up?
   */
  #define PAM_BAIL if (pam_error != PAM_SUCCESS) { \
     pam_end(pamh, 0); return False; \
   }
  PAM_password = password;
  PAM_username = this_user;
  pam_error = pam_start("samba", this_user, &PAM_conversation, &pamh);
  PAM_BAIL;
  pam_error = pam_authenticate(pamh, 0);
  PAM_BAIL;
  /* It is not clear to me that account management is the right thing
   * to do, but it is not clear that it isn't, either.  This can be
   * removed if no account management should be done.  Alternately,
   * put a pam_allow.so entry in /etc/pam.conf for account handling. */
  pam_error = pam_acct_mgmt(pamh, 0);
  PAM_BAIL;
  pam_end(pamh, PAM_SUCCESS);
  /* If this point is reached, the user has been authenticated. */
  return(True);
}
#endif


#ifdef AFS_AUTH
/*******************************************************************
check on AFS authentication
********************************************************************/
static BOOL afs_auth(char *this_user,char *password)
{
  long password_expires = 0;
  char *reason;
    
  /* For versions of AFS prior to 3.3, this routine has few arguments, */
  /* but since I can't find the old documentation... :-)               */
  setpag();
  if (ka_UserAuthenticateGeneral(KA_USERAUTH_VERSION+KA_USERAUTH_DOSETPAG,
				 this_user,
				 (char *) 0, /* instance */
				 (char *) 0, /* cell */
				 password,
				 0,          /* lifetime, default */
				 &password_expires, /*days 'til it expires */
				 0,          /* spare 2 */
				 &reason) == 0)
    return(True);
  return(False);
}
#endif


#ifdef DFS_AUTH

sec_login_handle_t my_dce_sec_context;
int dcelogin_atmost_once = 0;

/*******************************************************************
check on a DCE/DFS authentication
********************************************************************/
static BOOL dfs_auth(char *this_user,char *password)
{
  error_status_t err;
  int err2;
  int prterr;
  boolean32 password_reset;
  sec_passwd_rec_t my_dce_password;
  sec_login_auth_src_t auth_src = sec_login_auth_src_network;
  unsigned char dce_errstr[dce_c_error_string_len];

  /*
   * We only go for a DCE login context if the given password
   * matches that stored in the local password file.. 
   * Assumes local passwd file is kept in sync w/ DCE RGY!
   */

  if (!strcmp((char *)crypt(password,this_salt),this_crypted) ||
      dcelogin_atmost_once)
    return(False);

  if (sec_login_setup_identity(
			       (unsigned char *)this_user,
			       sec_login_no_flags,
			       &my_dce_sec_context,
			       &err) == 0)
    {
      dce_error_inq_text(err, dce_errstr, &err2);
      DEBUG(0,("DCE Setup Identity for %s failed: %s\n",
	       this_user,dce_errstr));
      return(False);
    }

  my_dce_password.version_number = sec_passwd_c_version_none;
  my_dce_password.pepper = NULL; 
  my_dce_password.key.key_type = sec_passwd_plain;
  my_dce_password.key.tagged_union.plain  = (idl_char *)password;
  
  if (sec_login_valid_and_cert_ident(my_dce_sec_context,
				     &my_dce_password,
				     &password_reset,
				     &auth_src,
				     &err) == 0 )
    { 
      dce_error_inq_text(err, dce_errstr, &err2);
      DEBUG(0,("DCE Identity Validation failed for principal %s: %s\n",
	       this_user,dce_errstr));
	  
      return(False);
    }

  sec_login_set_context(my_dce_sec_context, &err);
  if (err != error_status_ok )
    {  
      dce_error_inq_text(err, dce_errstr, &err2);
      DEBUG(0,("DCE login failed for principal %s, cant set context: %s\n",
	       this_user,dce_errstr));
      sec_login_purge_context(my_dce_sec_context, &err);
      return(False);
    }
  else
    {
      DEBUG(0,("DCE login succeeded for principal %s on pid %d\n",
	       this_user, getpid()));
    }

  dcelogin_atmost_once = 1;
  return (True);
}

void dfs_unlogin(void)
{
  error_status_t err;
  int err2;
  unsigned char dce_errstr[dce_c_error_string_len];

  sec_login_purge_context(my_dce_sec_context, &err);
  if (err != error_status_ok )
    {  
      dce_error_inq_text(err, dce_errstr, &err2);
      DEBUG(0,("DCE purge login context failed for server instance %d: %s\n",
	       getpid(), dce_errstr));
    }
}

#endif

#ifdef KRB5_AUTH
/*******************************************************************
check on Kerberos authentication
********************************************************************/
static BOOL krb5_auth(char *this_user,char *password)
{
	krb5_data tgtname = {
		0,
		KRB5_TGS_NAME_SIZE,
	 	KRB5_TGS_NAME
 	};
	krb5_context kcontext;
	krb5_principal kprinc;
	krb5_principal server;
	krb5_creds kcreds;
	int options = 0;
	krb5_address **addrs = (krb5_address **)0;
	krb5_preauthtype *preauth = NULL;
	krb5_keytab keytab = NULL;
	krb5_timestamp now;
	krb5_ccache ccache = NULL;
	int retval;
	char *name;

	if ( retval=krb5_init_context(&kcontext))
	{
		return(False);
	}

	if ( retval = krb5_timeofday(kcontext, &now) )
	{
		return(False);
	}

	if ( retval = krb5_cc_default(kcontext, &ccache) )
	{
		return(False);
	}
	
	if ( retval = krb5_parse_name(kcontext, this_user, &kprinc) )
	{
		return(False);
	}

	memset((char *)&kcreds, 0, sizeof(kcreds));

	kcreds.client = kprinc;
	
	if ((retval = krb5_build_principal_ext(kcontext, &server,
		krb5_princ_realm(kcontext, kprinc)->length,
		krb5_princ_realm(kcontext, kprinc)->data,
		tgtname.length,
		tgtname.data,
		krb5_princ_realm(kcontext, kprinc)->length,
		krb5_princ_realm(kcontext, kprinc)->data,
		0)))
	{
 		return(False);
	}

	kcreds.server = server;

	retval = krb5_get_in_tkt_with_password(kcontext,
		options,
		addrs,
		NULL,
		preauth,
		password,
		0,
		&kcreds,
		0);

	if ( retval )
	{
		return(False);
	}

	return(True);
}
#endif /* KRB5_AUTH */

#ifdef LINUX_BIGCRYPT
/****************************************************************************
an enhanced crypt for Linux to handle password longer than 8 characters
****************************************************************************/
static int linux_bigcrypt(char *password,char *salt1, char *crypted)
{
#define LINUX_PASSWORD_SEG_CHARS 8
  char salt[3];
  int i;
  
  StrnCpy(salt,salt1,2);
  crypted +=2;
  
  for ( i=strlen(password); i > 0; i -= LINUX_PASSWORD_SEG_CHARS) {
    char * p = crypt(password,salt) + 2;
    if(strncmp(p, crypted, LINUX_PASSWORD_SEG_CHARS) != 0)
      return(0);
    password += LINUX_PASSWORD_SEG_CHARS;
    crypted  += strlen(p);
  }
  
  return(1);
}
#endif


/****************************************************************************
apply a function to upper/lower case combinations
of a string and return true if one of them returns true.
try all combinations with N uppercase letters.
offset is the first char to try and change (start with 0)
it assumes the string starts lowercased
****************************************************************************/
static BOOL string_combinations2(char *s,int offset,BOOL (*fn)(),int N)
{
  int len = strlen(s);
  int i;

#ifdef PASSWORD_LENGTH
  len = MIN(len,PASSWORD_LENGTH);
#endif

  if (N <= 0 || offset >= len)
    return(fn(s));

  for (i=offset;i<(len-(N-1));i++)
    {      
      char c = s[i];
      if (!islower(c)) continue;
      s[i] = toupper(c);
      if (string_combinations2(s,i+1,fn,N-1))
	return(True);
      s[i] = c;
    }
  return(False);
}

/****************************************************************************
apply a function to upper/lower case combinations
of a string and return true if one of them returns true.
try all combinations with up to N uppercase letters.
offset is the first char to try and change (start with 0)
it assumes the string starts lowercased
****************************************************************************/
static BOOL string_combinations(char *s,BOOL (*fn)(),int N)
{
  int n;
  for (n=1;n<=N;n++)
    if (string_combinations2(s,0,fn,n)) return(True);
  return(False);
}



/****************************************************************************
core of password checking routine
****************************************************************************/
BOOL password_check(char *password)
{

#ifdef USE_PAM
/* This falls through if the password check fails
	- if NO_CRYPT is defined this causes an error msg
		saying Warning - no crypt available
	- if NO_CRYPT is NOT defined this is a potential security hole
		as it may authenticate via the crypt call when PAM
		settings say it should fail.
  if (pam_auth(this_user,password)) return(True);
Hence we make a direct return to avoid a second chance!!!
*/
  return (pam_auth(this_user,password));
#endif

#ifdef AFS_AUTH
  if (afs_auth(this_user,password)) return(True);
#endif

#ifdef DFS_AUTH
  if (dfs_auth(this_user,password)) return(True);
#endif 

#ifdef KRB5_AUTH
  if (krb5_auth(this_user,password)) return(True);
#endif

#ifdef PWDAUTH
  if (pwdauth(this_user,password) == 0)
    return(True);
#endif

#ifdef OSF1_ENH_SEC
  return(strcmp(osf1_bigcrypt(password,this_salt),this_crypted) == 0);
#endif

#ifdef ULTRIX_AUTH
  return (strcmp((char *)crypt16(password, this_salt ),this_crypted) == 0);
#endif

#ifdef LINUX_BIGCRYPT
  return(linux_bigcrypt(password,this_salt,this_crypted));
#endif

#ifdef NO_CRYPT
  DEBUG(1,("Warning - no crypt available\n"));
  return(False);
#else
  return(strcmp((char *)crypt(password,this_salt),this_crypted) == 0);
#endif
}

/****************************************************************************
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 ! */
  if(part_passwd == NULL)
    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);
}

/****************************************************************************
check if a username/password is OK
****************************************************************************/
BOOL password_ok(char *user,char *password, int pwlen, struct passwd *pwd)
{
  pstring pass2;
  int level = lp_passwordlevel();
  struct passwd *pass;
  char challenge[8];
  struct smb_passwd *smb_pass;
  BOOL challenge_done = False;

  if (password) password[pwlen] = 0;

  if (pwlen == 24)
    challenge_done = last_challenge(challenge);

#if DEBUG_PASSWORD
  if (challenge_done)
    {
      int i;      
      DEBUG(100,("checking user=[%s] pass=[",user));
      for( i = 0; i < 24; i++)
	DEBUG(100,("%0x ", (unsigned char)password[i]));
      DEBUG(100,("]\n"));
    } else {
	    DEBUG(100,("checking user=[%s] pass=[%s]\n",user,password));
    }
#endif

  if (!password)
    return(False);

  if (((!*password) || (!pwlen)) && !lp_null_passwords())
    return(False);

  if (pwd && !user) 
    {
      pass = (struct passwd *) pwd;
      user = pass->pw_name;
    } 
  else 
    pass = Get_Pwnam(user,True);

  DEBUG(4,("SMB Password - pwlen = %d, challenge_done = %d\n", pwlen, challenge_done));

  if((pwlen == 24) && challenge_done)
    {
      DEBUG(4,("Checking SMB password for user %s (l=24)\n",user));

      if (!pass) 
	{
	  DEBUG(3,("Couldn't find user %s\n",user));
	  return(False);
	}

      smb_pass = get_smbpwnam(user);
      if(!smb_pass)
	{
	  DEBUG(3,("Couldn't find user %s in smb_passwd file.\n", user));
	  return(False);
	}

      /* Ensure the uid's match */
      if(smb_pass->smb_userid != pass->pw_uid)
	{
	  DEBUG(3,("Error : UNIX and SMB uids in password files do not match !\n"));
	  return(False);
	}

	if(Protocol >= PROTOCOL_NT1)
	{
		/* We have the NT MD4 hash challenge available - see if we can
		   use it (ie. does it exist in the smbpasswd file).
		*/
		if(smb_pass->smb_nt_passwd != NULL)
		{
		  DEBUG(4,("Checking NT MD4 password\n"));
		  if(smb_password_check(password, 
					smb_pass->smb_nt_passwd, 
					(unsigned char *)challenge))
   		  {
	      	update_protected_database(user,True);
	        return(True);
    	  }
		  DEBUG(4,("NT MD4 password check failed\n"));
		}
	}

	/* Try against the lanman password */

      if (smb_password_check(password, 
			     smb_pass->smb_passwd,
			     (unsigned char *)challenge)) {
	update_protected_database(user,True);
	return(True);
      }

	DEBUG(3,("Error smb_password_check failed\n"));
    }

  DEBUG(4,("Checking password for user %s (l=%d)\n",user,pwlen));

  if (!pass) 
    {
      DEBUG(3,("Couldn't find user %s\n",user));
      return(False);
    }

#ifdef SHADOW_PWD
  {
    struct spwd *spass;

    /* many shadow systems require you to be root to get the password,
       in most cases this should already be the case when this
       function is called, except perhaps for IPC password changing
       requests */

    spass = getspnam(pass->pw_name);
    if (spass && spass->sp_pwdp)
      pass->pw_passwd = spass->sp_pwdp;
  }
#elif defined(IA_UINFO)
  {
      /* Need to get password with SVR4.2's ia_ functions instead of
         get{sp,pw}ent functions. Required by UnixWare 2.x, tested on 
         version 2.1. (tangent@cyberport.com) */
      uinfo_t uinfo;
      if (ia_openinfo(pass->pw_name, &uinfo) != -1)
        ia_get_logpwd(uinfo, &(pass->pw_passwd));
  }
#endif

#ifdef SecureWare
  {
    struct pr_passwd *pr_pw = getprpwnam(pass->pw_name);
    if (pr_pw && pr_pw->ufld.fd_encrypt)
      pass->pw_passwd = pr_pw->ufld.fd_encrypt;
  }
#endif

#ifdef HPUX_10_TRUSTED
  {
    struct pr_passwd *pr_pw = getprpwnam(pass->pw_name);
    if (pr_pw && pr_pw->ufld.fd_encrypt)
      pass->pw_passwd = pr_pw->ufld.fd_encrypt;
  }
#endif

#ifdef OSF1_ENH_SEC
  {
    struct pr_passwd *mypasswd;
    DEBUG(5,("Checking password for user %s in OSF1_ENH_SEC\n",user));
    mypasswd = getprpwnam (user);
    if ( mypasswd )
      { 
  	strcpy(pass->pw_name,mypasswd->ufld.fd_name);
  	strcpy(pass->pw_passwd,mypasswd->ufld.fd_encrypt);
      }
    else
      {
	DEBUG(5,("No entry for user %s in protected database !\n",user));
	return(False);
      }
  }
#endif

#ifdef ULTRIX_AUTH
  {
    AUTHORIZATION *ap = getauthuid( pass->pw_uid );
    if (ap)
      {
	strcpy( pass->pw_passwd, ap->a_password );
	endauthent();
      }
  }
#endif

  /* extract relevant info */
  strcpy(this_user,pass->pw_name);  
  strcpy(this_salt,pass->pw_passwd);
  strcpy(this_crypted,pass->pw_passwd);
 
  if (!*this_crypted) {
    if (!lp_null_passwords()) {
      DEBUG(2,("Disallowing access to %s due to null password\n",this_user));
      return(False);
    }
#ifndef PWDAUTH
    if (!*password) {
      DEBUG(3,("Allowing access to %s with null password\n",this_user));
      return(True);
    }
#endif    
  }

  /* try it as it came to us */
  if (password_check(password))
    {
      update_protected_database(user,True);
      return(True);
    }

  /* if the password was given to us with mixed case then we don't
     need to proceed as we know it hasn't been case modified by the
     client */
  if (strhasupper(password) && strhaslower(password))
    return(False);

  /* make a copy of it */
  StrnCpy(pass2,password,sizeof(pstring)-1);
  
  /* try all lowercase */
  strlower(password);
  if (password_check(password))
    {
      update_protected_database(user,True);
      return(True);
    }

  /* give up? */
  if(level < 1)
    {
      update_protected_database(user,False);

      /* restore it */
      strcpy(password,pass2);

      return(False);
    }

  /* last chance - all combinations of up to level chars upper! */
  strlower(password);

  if (string_combinations(password,password_check,level))
    {
      update_protected_database(user,True);
      return(True);
    }

  update_protected_database(user,False);
  
  /* restore it */
  strcpy(password,pass2);
  
  return(False);
}



/****************************************************************************
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));
  StrnCpy(invalid, lp_invalid_users(snum), sizeof(pstring));

  string_sub(valid,"%S",lp_servicename(snum));
  string_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);
    string_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 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
  
#if HAVE_GETGRNAM 
  {
    struct group *gptr = (struct group *)getgrnam(group);
    char **member;
    if (gptr)
      {
	member = gptr->gr_mem;
	while (member && *member)
	  {
	    static fstring name;
	    strcpy(name,*member);
	    if (user_ok(name,snum) &&
		password_ok(name,password,pwlen,NULL))
	      return(&name[0]);
	    member++;
	  }
#ifdef GROUP_CHECK_PWENT
	{
	  struct passwd *pwd;
	  static fstring tm;
	  
	  setpwent ();
	  while (pwd = getpwent ()) {
	    if (*(pwd->pw_passwd) && pwd->pw_gid == gptr->gr_gid) {
	      /* This Entry have PASSWORD and same GID then check pwd */
	      if (password_ok(NULL, password, pwlen, pwd)) {
		strcpy(tm, pwd->pw_name);
		endpwent ();
		return tm;
	      }
	    }
	  }
	  endpwent ();
	}
#endif /* GROUP_CHECK_PWENT */
      }
  }      
#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;
  
  *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)))
    {

      user_struct *vuser = get_valid_user_struct(vuid);

      /* 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->name,snum) &&
	    password_ok(vuser->name, password, pwlen, NULL)) {
	  strcpy(user, vuser->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;
	      strcpy(user2,auser);
	      if (!user_ok(user2,snum)) continue;
		  
	      if (password_ok(user2,password, pwlen, NULL)) {
		ok = True;
		strcpy(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_revalidate(snum) &&
	  (vuser != 0) && !vuser->guest &&
	  user_ok(vuser->name,snum)) {
	strcpy(user,vuser->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));

	string_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;
		    strcpy(user,auser);
		    DEBUG(3,("ACCEPTED: group username and given password ok\n"));
		  }
	      }
	    else
	      {
		fstring user2;
		strcpy(user2,auser);
		if (user_ok(user2,snum) && 
		    password_ok(user2,password,pwlen,NULL))
		  {
		    ok = True;
		    strcpy(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))
	{
	  strcpy(user,guestname);
	  ok = True;
	  DEBUG(3,("ACCEPTED: guest account and guest ok\n"));
	}
      else
	DEBUG(0,("Invalid guest account %s??\n",guestname));
      *guest = True;
      *force = 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)
{
  pstring buf;
  int plus_allowed = 1;
  char *file_host;
  char *file_user;
  FILE *fp = fopen(equiv_file, "r");
  DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file));
  if (! fp) return False;
  while(fgets(buf, sizeof(buf), fp)) 
  {
    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"));
	    fclose(fp);
	    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;

#ifdef NETGROUP	  
	  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 - add -DNETGROUP and recompile\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)) 
	    {
	      fclose(fp);
	      DEBUG(5, ("check_user_equiv matched %s%s %s\n",
			(plus ? "+" : "-"), file_host,
			(file_user ? file_user : "")));
	      return (plus ? True : False);
	    }
	}
      }
    }
  }
  fclose(fp);
  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_home_dir(user);
      if (home)
	{
	  sprintf(rhostsfile, "%s/.rhosts", home);
	  if (check_user_equiv(user,client_name(),rhostsfile))
	    return(True);
	}
    }

  return(False);
}


int password_client = -1;
static fstring pserver;
static char *secserver_inbuf = NULL;

/****************************************************************************
attempted support for server level security 
****************************************************************************/
BOOL server_cryptkey(char *buf)
{
  pstring outbuf;
  fstring pass_protocol;
  extern fstring remote_machine;
  char *p;
  int len;
  fstring desthost;
  struct in_addr dest_ip;
  int port = SMB_PORT;
  BOOL ret;
  
  if(secserver_inbuf == NULL) {
    secserver_inbuf = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
    if(secserver_inbuf == NULL) {
      DEBUG(0,("server_cryptkey: malloc fail for input buffer.\n"));
      return False;
    }
  }

  if (password_client >= 0)
    close(password_client);
  password_client = -1;

  if (Protocol < PROTOCOL_NT1) {
    strcpy(pass_protocol,"LM1.2X002");
  } else {
    strcpy(pass_protocol,"NT LM 0.12");
  }

  bzero(secserver_inbuf,BUFFER_SIZE + SAFETY_MARGIN);
  bzero(outbuf,sizeof(outbuf));

  for (p=strtok(lp_passwordserver(),LIST_SEP); p ; p = strtok(NULL,LIST_SEP)) {
    strcpy(desthost,p);
    standard_sub_basic(desthost);
    strupper(desthost);

    dest_ip = *interpret_addr2(desthost);
    if (zero_ip(dest_ip)) {
      DEBUG(1,("Can't resolve address for %s\n",p));
      continue;
    }

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

    password_client = open_socket_out(SOCK_STREAM, &dest_ip, port, SHORT_CONNECT_TIMEOUT);
    if (password_client >= 0) {
      DEBUG(3,("connected to password server %s\n",p));
      StrnCpy(pserver,p,sizeof(pserver)-1);
      break;
    }
  }

  if (password_client < 0) {
    DEBUG(1,("password server not available\n"));
    return(False);
  }


  /* send a session request (RFC 8002) */

  /* put in the destination name */
  len = 4;
  p = outbuf+len;
  name_mangle(desthost,p,' ');
  len += name_len(p);
  p = outbuf+len;

  /* and my name */
  /* Fix from Frank Varnavas <varnavas@ny.ubs.com>.
     We cannot use the same name as the client to 
     the NT password server, as NT will drop client
     connections if the same client name connects
     twice. Instead, synthesize a name from our pid.
     and the remote machine name.
   */
  {
    char buf2[32]; /* create name as PIDname */
    sprintf(buf2,"%d", getpid());
    strncpy(&buf2[strlen(buf2)], remote_machine, 31 - strlen(buf2));
    buf2[31] = '\0';
    DEBUG(1,("negprot w/password server as %s\n",buf2));
    name_mangle(buf2,p,' ');
    len += name_len(p);
  }

  _smb_setlen(outbuf,len);
  CVAL(outbuf,0) = 0x81;

  send_smb(password_client,outbuf);
  
 
  if (!receive_smb(password_client,secserver_inbuf,5000) ||
      CVAL(secserver_inbuf,0) != 0x82) {
    DEBUG(1,("%s rejected the session\n",pserver));
    close(password_client); password_client = -1;
    return(False);
  }

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

  bzero(outbuf,smb_size);

  /* setup the protocol string */
  set_message(outbuf,0,strlen(pass_protocol)+2,True);
  p = smb_buf(outbuf);
  *p++ = 2;
  strcpy(p,pass_protocol);

  CVAL(outbuf,smb_com) = SMBnegprot;
  CVAL(outbuf,smb_flg) = 0x8;
  SSVAL(outbuf,smb_flg2,0x1);

  send_smb(password_client,outbuf);
  ret = receive_smb(password_client,secserver_inbuf,5000);

  if (!ret || CVAL(secserver_inbuf,smb_rcls) || SVAL(secserver_inbuf,smb_vwv0)) {
    DEBUG(1,("%s rejected the protocol\n",pserver));
    close(password_client); password_client= -1;
    return(False);
  }

  if (!(CVAL(secserver_inbuf,smb_vwv1) & 1)) {
    DEBUG(1,("%s isn't in user level security mode\n",pserver));
    close(password_client); password_client= -1;
    return(False);
  }

  memcpy(buf,secserver_inbuf,smb_len(secserver_inbuf)+4);

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

  return(True);
}

/****************************************************************************
attempted support for server level security 
****************************************************************************/
BOOL server_validate(char *buf)
{
  pstring outbuf;  
  BOOL ret;

  if(secserver_inbuf == NULL) {
    secserver_inbuf = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
    if(secserver_inbuf == NULL) {
      DEBUG(0,("server_validate: malloc fail for input buffer.\n"));
      return False;
    }
  }

  if (password_client < 0) {
    DEBUG(1,("%s not connected\n",pserver));
    return(False);
  }  

  bzero(secserver_inbuf,BUFFER_SIZE + SAFETY_MARGIN);
  memcpy(outbuf,buf,sizeof(outbuf));

  /* send a session setup command */
  CVAL(outbuf,smb_flg) = 0x8;
  SSVAL(outbuf,smb_flg2,0x1);
  CVAL(outbuf,smb_vwv0) = 0xFF;

  set_message(outbuf,smb_numwords(outbuf),smb_buflen(outbuf),False);

  SCVAL(secserver_inbuf,smb_rcls,1);

  send_smb(password_client,outbuf);
  ret = receive_smb(password_client,secserver_inbuf,5000);

  if (!ret || CVAL(secserver_inbuf,smb_rcls) != 0) {
    DEBUG(1,("password server %s rejected the password\n",pserver));
    return(False);
  }

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

  DEBUG(3,("password server %s accepted the password\n",pserver));

#if !KEEP_PASSWORD_SERVER_OPEN
  close(password_client); password_client= -1;
#endif

  return(True);
}