summaryrefslogtreecommitdiff
path: root/source3/passdb/smbpass.c
blob: a2b648b2fd239d47eabc1fdbaef7e6c8e2aed486 (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
/*
 * Unix SMB/Netbios implementation. Version 1.9. SMB parameters and setup
 * Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995.
 * 
 * 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"

#ifdef USE_SMBPASS_DB

extern int pw_file_lock_depth;
extern int DEBUGLEVEL;
extern pstring samlogon_user;
extern BOOL sam_logon_in_ssb;

static char s_readbuf[1024];

/***************************************************************
 Start to enumerate the smbpasswd list. Returns a void pointer
 to ensure no modification outside this module.
****************************************************************/

static void *startsmbfilepwent(BOOL update)
{
  FILE *fp = NULL;
  char *pfile = lp_smb_passwd_file();

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

  fp = fopen(pfile, update ? "r+b" : "rb");

  if (fp == NULL) {
    DEBUG(0, ("startsmbfilepwent: unable to open file %s\n", pfile));
    return NULL;
  }

  /* Set a buffer to do more efficient reads */
  setvbuf(fp, s_readbuf, _IOFBF, sizeof(s_readbuf));

  if (!pw_file_lock(fileno(fp), (update ? F_WRLCK : F_RDLCK), 5, &pw_file_lock_depth))
  {
    DEBUG(0, ("startsmbfilepwent: unable to lock file %s\n", pfile));
    fclose(fp);
    return NULL;
  }

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

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

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

static void endsmbfilepwent(void *vp)
{
  FILE *fp = (FILE *)vp;

  pw_file_unlock(fileno(fp), &pw_file_lock_depth);
  fclose(fp);
  DEBUG(7, ("endsmbfilepwent: closed password file.\n"));
}

/*************************************************************************
 Routine to return the next entry in the smbpasswd list.
 *************************************************************************/
static struct smb_passwd *getsmbfilepwent(void *vp)
{
  /* Static buffers we will return. */
  static struct smb_passwd pw_buf;
  static pstring  user_name;
  static unsigned char smbpwd[16];
  static unsigned char smbntpwd[16];
  FILE *fp = (FILE *)vp;
  char            linebuf[256];
  unsigned char   c;
  unsigned char  *p;
  long            uidval;
  long            linebuf_len;

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

  pdb_init_smb(&pw_buf);

  pw_buf.acct_ctrl = ACB_NORMAL;  

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

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

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

#ifdef DEBUG_PASSWORD
    DEBUG(100, ("getsmbfilepwent: got line |%s|\n", linebuf));
#endif
    if ((linebuf[0] == 0) && feof(fp)) {
      DEBUG(4, ("getsmbfilepwent: end of file reached\n"));
      break;
    }
    /*
     * The line we have should be of the form :-
     * 
     * username:uid:32hex bytes:[Account type]:LCT-12345678....other flags presently
     * ignored....
     * 
     * or,
     *
     * username:uid:32hex bytes:32hex bytes:[Account type]:LCT-12345678....ignored....
     *
     * if Windows NT compatible passwords are also present.
     * [Account type] is an ascii encoding of the type of account.
     * LCT-(8 hex digits) is the time_t value of the last change time.
     */

    if (linebuf[0] == '#' || linebuf[0] == '\0') {
      DEBUG(6, ("getsmbfilepwent: skipping comment or blank line\n"));
      continue;
    }
    p = (unsigned char *) strchr(linebuf, ':');
    if (p == NULL) {
      DEBUG(0, ("getsmbfilepwent: malformed password entry (no :)\n"));
      continue;
    }
    /*
     * As 256 is shorter than a pstring we don't need to check
     * length here - if this ever changes....
     */
    strncpy(user_name, linebuf, PTR_DIFF(p, linebuf));
    user_name[PTR_DIFF(p, linebuf)] = '\0';

    /* Get smb uid. */

    p++;		/* Go past ':' */
    if (!isdigit(*p)) {
      DEBUG(0, ("getsmbfilepwent: malformed password entry (uid not number)\n"));
      continue;
    }

    uidval = atoi((char *) p);

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

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

    pw_buf.smb_name = user_name;
    pw_buf.smb_userid = uidval;

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

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

    if (*p == '*' || *p == 'X') {
      /* Password deliberately invalid - end here. */
      DEBUG(10, ("getsmbfilepwent: entry invalidated for user %s\n", user_name));
      pw_buf.smb_nt_passwd = NULL;
      pw_buf.smb_passwd = NULL;
      pw_buf.acct_ctrl |= ACB_DISABLED;
      return &pw_buf;
    }

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

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

    if (!strncasecmp((char *) p, "NO PASSWORD", 11)) {
      pw_buf.smb_passwd = NULL;
      pw_buf.acct_ctrl |= ACB_PWNOTREQ;
    } else {
      if (!pdb_gethexpwd((char *)p, (char *)smbpwd)) {
        DEBUG(0, ("getsmbfilepwent: Malformed Lanman password entry (non hex chars)\n"));
        continue;
      }
      pw_buf.smb_passwd = smbpwd;
    }

    /* 
     * Now check if the NT compatible password is
     * available.
     */
    pw_buf.smb_nt_passwd = NULL;

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

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

    if (*p == '[')
	{
      pw_buf.acct_ctrl = pdb_decode_acct_ctrl((char*)p);

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

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

    return &pw_buf;
  }

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

/*************************************************************************
 Routine to return the next entry in the smbpasswd list.
 this function is a nice, messy combination of reading:
 - the smbpasswd file
 - the unix password database
 - smb.conf options (not done at present).
 *************************************************************************/

static struct sam_passwd *getsmbfile21pwent(void *vp)
{
	struct smb_passwd *pw_buf = getsmbfilepwent(vp);
	static struct sam_passwd user;
	struct passwd *pwfile;

	static pstring full_name;
	static pstring home_dir;
	static pstring home_drive;
	static pstring logon_script;
	static pstring profile_path;
	static pstring acct_desc;
	static pstring workstations;
	
	if (pw_buf == NULL) return NULL;

	pwfile = getpwnam(pw_buf->smb_name);
	if (pwfile == NULL) return NULL;

	pdb_init_sam(&user);

	pstrcpy(samlogon_user, pw_buf->smb_name);

	if (samlogon_user[strlen(samlogon_user)-1] != '$')
	{
		/* XXXX hack to get standard_sub_basic() to use sam logon username */
		/* possibly a better way would be to do a become_user() call */
		sam_logon_in_ssb = True;

		user.smb_userid    = pw_buf->smb_userid;
		user.smb_grpid     = pwfile->pw_gid;

		user.user_rid  = pdb_uid_to_user_rid (user.smb_userid);
		user.group_rid = pdb_gid_to_group_rid(user.smb_grpid );

		pstrcpy(full_name    , pwfile->pw_gecos        );
		pstrcpy(logon_script , lp_logon_script       ());
		pstrcpy(profile_path , lp_logon_path         ());
		pstrcpy(home_drive   , lp_logon_drive        ());
		pstrcpy(home_dir     , lp_logon_home         ());
		pstrcpy(acct_desc    , "");
		pstrcpy(workstations , "");

		sam_logon_in_ssb = False;
	}
	else
	{
		user.smb_userid    = pw_buf->smb_userid;
		user.smb_grpid     = pwfile->pw_gid;

		user.user_rid  = pdb_uid_to_user_rid (user.smb_userid);
		user.group_rid = DOMAIN_GROUP_RID_USERS; /* lkclXXXX this is OBSERVED behaviour by NT PDCs, enforced here. */

		pstrcpy(full_name    , "");
		pstrcpy(logon_script , "");
		pstrcpy(profile_path , "");
		pstrcpy(home_drive   , "");
		pstrcpy(home_dir     , "");
		pstrcpy(acct_desc    , "");
		pstrcpy(workstations , "");
	}

	user.smb_name     = pw_buf->smb_name;
	user.full_name    = full_name;
	user.home_dir     = home_dir;
	user.dir_drive    = home_drive;
	user.logon_script = logon_script;
	user.profile_path = profile_path;
	user.acct_desc    = acct_desc;
	user.workstations = workstations;

	user.unknown_str = NULL; /* don't know, yet! */
	user.munged_dial = NULL; /* "munged" dial-back telephone number */

	user.smb_nt_passwd = pw_buf->smb_nt_passwd;
	user.smb_passwd    = pw_buf->smb_passwd;
			
	user.acct_ctrl = pw_buf->acct_ctrl;

	user.unknown_3 = 0xffffff; /* don't know */
	user.logon_divs = 168; /* hours per week */
	user.hours_len = 21; /* 21 times 8 bits = 168 */
	memset(user.hours, 0xff, user.hours_len); /* available at all hours */
	user.unknown_5 = 0x00020000; /* don't know */
	user.unknown_5 = 0x000004ec; /* don't know */

	return &user;
}

/*************************************************************************
 Return the current position in the smbpasswd list as an SMB_BIG_UINT.
 This must be treated as an opaque token.
*************************************************************************/

static SMB_BIG_UINT getsmbfilepwpos(void *vp)
{
  return (SMB_BIG_UINT)sys_ftell((FILE *)vp);
}

/*************************************************************************
 Set the current position in the smbpasswd list from an SMB_BIG_UINT.
 This must be treated as an opaque token.
*************************************************************************/

static BOOL setsmbfilepwpos(void *vp, SMB_BIG_UINT tok)
{
  return !sys_fseek((FILE *)vp, (SMB_OFF_T)tok, SEEK_SET);
}

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

static BOOL add_smbfilepwd_entry(struct smb_passwd *newpwd)
{
  char *pfile = lp_smb_passwd_file();
  struct smb_passwd *pwd = NULL;
  FILE *fp = NULL;

  int i;
  int wr_len;

  int fd;
  int new_entry_length;
  char *new_entry;
  SMB_OFF_T offpos;
  char *p;

  /* Open the smbpassword file - for update. */
  fp = startsmbfilepwent(True);

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

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

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

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

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

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

  new_entry_length = strlen(newpwd->smb_name) + 1 + 15 + 1 + 32 + 1 + 32 + 1 + 5 + 1 + 13 + 2;

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

  slprintf(new_entry, new_entry_length - 1, "%s:%u:", newpwd->smb_name, (unsigned)newpwd->smb_userid);
  p = &new_entry[strlen(new_entry)];

  if(newpwd->smb_passwd != NULL) {
    for( i = 0; i < 16; i++) {
      slprintf((char *)&p[i*2], new_entry_length - (p - new_entry) - 1, "%02X", newpwd->smb_passwd[i]);
    }
  } else {
    i=0;
    if(newpwd->acct_ctrl & ACB_PWNOTREQ)
      safe_strcpy((char *)p, "NO PASSWORDXXXXXXXXXXXXXXXXXXXXX", new_entry_length - 1 - (p - new_entry));
    else
      safe_strcpy((char *)p, "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", new_entry_length - 1 - (p - new_entry));
  }
  
  p += 32;

  *p++ = ':';

  if(newpwd->smb_nt_passwd != NULL) {
    for( i = 0; i < 16; i++) {
      slprintf((char *)&p[i*2], new_entry_length - 1 - (p - new_entry), "%02X", newpwd->smb_nt_passwd[i]);
    }
  } else {
    if(newpwd->acct_ctrl & ACB_PWNOTREQ)
      safe_strcpy((char *)p, "NO PASSWORDXXXXXXXXXXXXXXXXXXXXX", new_entry_length - 1 - (p - new_entry));
    else
      safe_strcpy((char *)p, "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", new_entry_length - 1 - (p - new_entry));
  }

  p += 32;

  *p++ = ':';

  /* Add the account encoding and the last change time. */
  slprintf((char *)p, new_entry_length - 1 - (p - new_entry),  "%s:LCT-%08X:\n",
                                  pdb_encode_acct_ctrl(newpwd->acct_ctrl),
                     (uint32)time(NULL));

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

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

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

    endsmbfilepwent(fp);
    return False;
  }

  endsmbfilepwent(fp);
  return True;
}

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

static BOOL mod_smbfilepwd_entry(struct smb_passwd* pwd, BOOL override)
{
  /* Static buffers we will return. */
  static pstring  user_name;

  char            linebuf[256];
  char            readbuf[1024];
  unsigned char   c;
  fstring         ascii_p16;
  fstring         encode_bits;
  unsigned char  *p = NULL;
  long            linebuf_len = 0;
  FILE           *fp;
  int             lockfd;
  char           *pfile = lp_smb_passwd_file();
  BOOL found_entry = False;
  BOOL got_pass_last_set_time = False;

  SMB_OFF_T pwd_seekpos = 0;

  int i;
  int wr_len;
  int fd;

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

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

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

  lockfd = fileno(fp);

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

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

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

    linebuf[0] = '\0';

    fgets(linebuf, sizeof(linebuf), fp);
    if (ferror(fp)) {
      pw_file_unlock(lockfd, &pw_file_lock_depth);
      fclose(fp);
      return False;
    }

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

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

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

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

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

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

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

    /*
     * As 256 is shorter than a pstring we don't need to check
     * length here - if this ever changes....
     */
    strncpy(user_name, linebuf, PTR_DIFF(p, linebuf));
    user_name[PTR_DIFF(p, linebuf)] = '\0';
    if (strequal(user_name, pwd->smb_name)) {
      found_entry = True;
      break;
    }
  }

  if (!found_entry) return False;

  DEBUG(6, ("mod_smbfilepwd_entry: entry exists\n"));

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

  if (!isdigit(*p)) {
    DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry (uid not number)\n"));
    pw_file_unlock(lockfd, &pw_file_lock_depth);
    fclose(fp);
    return False;
  }

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

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

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

  if (!override && (*p == '*' || *p == 'X')) {
    /* Password deliberately invalid - end here. */
    DEBUG(10, ("mod_smbfilepwd_entry: entry invalidated for user %s\n", user_name));
    pw_file_unlock(lockfd, &pw_file_lock_depth);
    fclose(fp);
    return False;
  }

  if (linebuf_len < (PTR_DIFF(p, linebuf) + 33)) {
    DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry (passwd too short)\n"));
    pw_file_unlock(lockfd,&pw_file_lock_depth);
    fclose(fp);
    return (False);
  }

  if (p[32] != ':') {
    DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry (no terminating :)\n"));
    pw_file_unlock(lockfd,&pw_file_lock_depth);
    fclose(fp);
    return False;
  }

  if (!override && (*p == '*' || *p == 'X')) {
    pw_file_unlock(lockfd,&pw_file_lock_depth);
    fclose(fp);
    return False;
  }

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

  if (p[32] != ':') {
    DEBUG(0, ("mod_smbfilepwd_entry: malformed password entry (no terminating :)\n"));
    pw_file_unlock(lockfd,&pw_file_lock_depth);
    fclose(fp);
    return False;
  }

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

  if (*p == '[') {

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

    encode_bits[i] = '\0';

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

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

      /* We should be pointing at the TLC entry. */
      if((linebuf_len > (PTR_DIFF(p, linebuf) + 13)) && StrnCaseCmp((char *)p, "LCT-", 4)) {

        p += 4;
        for(i = 0; i < 8; i++) {
          if(p[i] == '\0' || !isxdigit(p[i]))
            break;
        }
        if(i == 8) {
          /*
           * p points at 8 characters of hex digits -
           * read into a time_t as the seconds since
           * 1970 that the password was last changed.
           */
          got_pass_last_set_time = True;
        } /* i == 8 */
      } /* *p && StrnCaseCmp() */
    } /* p == ':' */
  } /* p == '[' */

  /* Entry is correctly formed. */

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

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

  fd = fileno(fp);

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

  /* Sanity check - ensure the character is a ':' */
  if (read(fd, &c, 1) != 1) {
    DEBUG(0, ("mod_smbfilepwd_entry: read fail on file %s.\n", pfile));
    pw_file_unlock(lockfd,&pw_file_lock_depth);
    fclose(fp);
    return False;
  }

  if (c != ':')	{
    DEBUG(0, ("mod_smbfilepwd_entry: check on passwd file %s failed.\n", pfile));
    pw_file_unlock(lockfd,&pw_file_lock_depth);
    fclose(fp);
    return False;
  }
 
  /* Create the 32 byte representation of the new p16 */
  if(pwd->smb_passwd != NULL) {
    for (i = 0; i < 16; i++) {
      slprintf(&ascii_p16[i*2], sizeof(fstring) - 1, "%02X", (uchar) pwd->smb_passwd[i]);
    }
  } else {
    if(pwd->acct_ctrl & ACB_PWNOTREQ)
      fstrcpy(ascii_p16, "NO PASSWORDXXXXXXXXXXXXXXXXXXXXX");
    else
      fstrcpy(ascii_p16, "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
  }

  /* Add on the NT md4 hash */
  ascii_p16[32] = ':';
  wr_len = 65;
  if (pwd->smb_nt_passwd != NULL) {
    for (i = 0; i < 16; i++) {
      slprintf(&ascii_p16[(i*2)+33], sizeof(fstring) - 1, "%02X", (uchar) pwd->smb_nt_passwd[i]);
    }
  } else {
    if(pwd->acct_ctrl & ACB_PWNOTREQ)
      fstrcpy(&ascii_p16[33], "NO PASSWORDXXXXXXXXXXXXXXXXXXXXX");
    else
      fstrcpy(&ascii_p16[33], "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
  }

  /* Add on the account info bits and the time of last
     password change. */

  pwd->pass_last_set_time = time(NULL);

  if(got_pass_last_set_time) {
    slprintf(&ascii_p16[strlen(ascii_p16)], 
	     sizeof(ascii_p16)-(strlen(ascii_p16)+1),
	     ":[%s]:TLC-%08X:", 
                     encode_bits, (uint32)pwd->pass_last_set_time );
    wr_len = strlen(ascii_p16);
  }

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

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

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

/*
 * Stub functions - implemented in terms of others.
 */

static BOOL mod_smbfile21pwd_entry(struct sam_passwd* pwd, BOOL override)
{
 	return mod_smbfilepwd_entry(pdb_sam_to_smb(pwd), override);
}

static BOOL add_smbfile21pwd_entry(struct sam_passwd *newpwd)
{
 	return add_smbfilepwd_entry(pdb_sam_to_smb(newpwd));
}

static struct sam_disp_info *getsmbfiledispnam(char *name)
{
	return pdb_sam_to_dispinfo(getsam21pwnam(name));
}

static struct sam_disp_info *getsmbfiledisprid(uint32 rid)
{
	return pdb_sam_to_dispinfo(getsam21pwrid(rid));
}

static struct sam_disp_info *getsmbfiledispent(void *vp)
{
	return pdb_sam_to_dispinfo(getsam21pwent(vp));
}

static struct passdb_ops file_ops = {
  startsmbfilepwent,
  endsmbfilepwent,
  getsmbfilepwpos,
  setsmbfilepwpos,
  iterate_getsmbpwnam,          /* In passdb.c */
  iterate_getsmbpwuid,          /* In passdb.c */
  getsmbfilepwent,
  add_smbfilepwd_entry,
  mod_smbfilepwd_entry,
  getsmbfile21pwent,
  iterate_getsam21pwnam,
  iterate_getsam21pwuid,
  iterate_getsam21pwrid, 
  add_smbfile21pwd_entry,
  mod_smbfile21pwd_entry,
  getsmbfiledispnam,
  getsmbfiledisprid,
  getsmbfiledispent
};

struct passdb_ops *file_initialize_password_db(void)
{    
  return &file_ops;
}

#else
 /* Do *NOT* make this function static. It breaks the compile on gcc. JRA */
 void smbpass_dummy_function(void) { } /* stop some compilers complaining */
#endif /* USE_SMBPASS_DB */