summaryrefslogtreecommitdiff
path: root/source3/smbd/service.c
blob: 44d73b2ab27b8382c4994969dc60c8508f0ebd1b (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
/* 
   Unix SMB/CIFS implementation.
   service (connection) opening and closing
   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 struct timeval smb_last_time;
extern int case_default;
extern BOOL case_preserve;
extern BOOL short_case_preserve;
extern BOOL case_mangle;
extern BOOL case_sensitive;
extern BOOL use_mangled_map;
extern userdom_struct current_user_info;


/****************************************************************************
 Load parameters specific to a connection/service.
****************************************************************************/

BOOL set_current_service(connection_struct *conn,BOOL do_chdir)
{
	extern char magic_char;
	static connection_struct *last_conn;
	int snum;

	if (!conn)  {
		last_conn = NULL;
		return(False);
	}

	conn->lastused = smb_last_time.tv_sec;

	snum = SNUM(conn);
  
	if (do_chdir &&
	    vfs_ChDir(conn,conn->connectpath) != 0 &&
	    vfs_ChDir(conn,conn->origpath) != 0) {
		DEBUG(0,("chdir (%s) failed\n",
			 conn->connectpath));
		return(False);
	}

	if (conn == last_conn)
		return(True);

	last_conn = conn;

	case_default = lp_defaultcase(snum);
	case_preserve = lp_preservecase(snum);
	short_case_preserve = lp_shortpreservecase(snum);
	case_mangle = lp_casemangle(snum);
	case_sensitive = lp_casesensitive(snum);
	magic_char = lp_magicchar(snum);
	use_mangled_map = (*lp_mangled_map(snum) ? True:False);
	return(True);
}

/****************************************************************************
 Add a home service. Returns the new service number or -1 if fail.
****************************************************************************/

int add_home_service(const char *service, const char *username, const char *homedir)
{
	int iHomeService;

	if (!service || !homedir)
		return -1;

	if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0)
		return -1;

	/*
	 * If this is a winbindd provided username, remove
	 * the domain component before adding the service.
	 * Log a warning if the "path=" parameter does not
	 * include any macros.
	 */

	{
		const char *p = strchr(service,*lp_winbind_separator());

		/* We only want the 'user' part of the string */
		if (p) {
			service = p + 1;
		}
	}

	if (!lp_add_home(service, iHomeService, username, homedir)) {
		return -1;
	}
	
	return lp_servicenumber(service);

}


/**
 * Find a service entry. service is always in dos codepage.
 *
 * @param service is modified (to canonical form??)
 **/
int find_service(fstring service)
{
   int iService;

   all_string_sub(service,"\\","/",0);

   iService = lp_servicenumber(service);

   /* now handle the special case of a home directory */
   if (iService < 0)
   {
      char *phome_dir = get_user_home_dir(service);

      if(!phome_dir)
      {
        /*
         * Try mapping the servicename, it may
         * be a Windows to unix mapped user name.
         */
        if(map_username(service))
          phome_dir = get_user_home_dir(service);
      }

      DEBUG(3,("checking for home directory %s gave %s\n",service,
            phome_dir?phome_dir:"(NULL)"));

      iService = add_home_service(service,service /* 'username' */, phome_dir);
   }

   /* If we still don't have a service, attempt to add it as a printer. */
   if (iService < 0)
   {
      int iPrinterService;

      if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) >= 0)
      {
         char *pszTemp;

         DEBUG(3,("checking whether %s is a valid printer name...\n", service));
         pszTemp = lp_printcapname();
         if ((pszTemp != NULL) && pcap_printername_ok(service, pszTemp))
         {
            DEBUG(3,("%s is a valid printer name\n", service));
            DEBUG(3,("adding %s as a printer service\n", service));
            lp_add_printer(service, iPrinterService);
            iService = lp_servicenumber(service);
            if (iService < 0)
               DEBUG(0,("failed to add %s as a printer service!\n", service));
         }
         else
            DEBUG(3,("%s is not a valid printer name\n", service));
      }
   }

   /* Check for default vfs service?  Unsure whether to implement this */
   if (iService < 0)
   {
   }

   /* just possibly it's a default service? */
   if (iService < 0) 
   {
     char *pdefservice = lp_defaultservice();
     if (pdefservice && *pdefservice && 
	 !strequal(pdefservice,service) &&
	 !strstr(service,".."))
     {
       /*
        * We need to do a local copy here as lp_defaultservice() 
        * returns one of the rotating lp_string buffers that
        * could get overwritten by the recursive find_service() call
        * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
        */
       pstring defservice;
       pstrcpy(defservice, pdefservice);
       iService = find_service(defservice);
       if (iService >= 0)
       {
         all_string_sub(service, "_","/",0);
         iService = lp_add_service(service, iService);
       }
     }
   }

   if (iService >= 0)
     if (!VALID_SNUM(iService))
     {
       DEBUG(0,("Invalid snum %d for %s\n",iService, service));
       iService = -1;
     }

   if (iService < 0)
     DEBUG(3,("find_service() failed to find service %s\n", service));

   return (iService);
}


/****************************************************************************
 do some basic sainity checks on the share.  
 This function modifies dev, ecode.
****************************************************************************/
static NTSTATUS share_sanity_checks(int snum, fstring dev) 
{
	
	if (!lp_snum_ok(snum) || 
	    !check_access(smbd_server_fd(), 
			  lp_hostsallow(snum), lp_hostsdeny(snum))) {    
		return NT_STATUS_ACCESS_DENIED;
	}

	if (dev[0] == '?' || !dev[0]) {
		if (lp_print_ok(snum)) {
			fstrcpy(dev,"LPT1:");
		} else if (strequal(lp_fstype(snum), "IPC")) {
			fstrcpy(dev, "IPC");
		} else {
			fstrcpy(dev,"A:");
		}
	}

	strupper_m(dev);

	if (lp_print_ok(snum)) {
		if (!strequal(dev, "LPT1:")) {
			return NT_STATUS_BAD_DEVICE_TYPE;
		}
	} else if (strequal(lp_fstype(snum), "IPC")) {
		if (!strequal(dev, "IPC")) {
			return NT_STATUS_BAD_DEVICE_TYPE;
		}
	} else if (!strequal(dev, "A:")) {
		return NT_STATUS_BAD_DEVICE_TYPE;
	}

	/* Behave as a printer if we are supposed to */
	if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
		fstrcpy(dev, "LPT1:");
	}

	return NT_STATUS_OK;
}


/****************************************************************************
 readonly share?
****************************************************************************/
static void set_read_only(connection_struct *conn, gid_t *groups, size_t n_groups)
{
	char **list;
	char *service = lp_servicename(conn->service);
	conn->read_only = lp_readonly(conn->service);

	if (!service) return;

	str_list_copy(&list, lp_readlist(conn->service));
	if (list) {
		if ( !str_list_sub_basic(list, current_user_info.smb_name) ) {
			DEBUG(0, ("ERROR: read list substitution failed\n"));
		}
		if (user_in_list(conn->user, (const char **)list, groups, n_groups))
			conn->read_only = True;
		str_list_free(&list);
	}
	
	str_list_copy(&list, lp_writelist(conn->service));
	if (list) {
		if ( !str_list_sub_basic(list, current_user_info.smb_name) ) {
			DEBUG(0, ("ERROR: write list substitution failed\n"));
		}
		if (user_in_list(conn->user, (const char **)list, groups, n_groups))
			conn->read_only = False;
		str_list_free(&list);
	}
}


/****************************************************************************
  admin user check
****************************************************************************/
static void set_admin_user(connection_struct *conn, gid_t *groups, size_t n_groups)
{
	/* admin user check */
	
	/* JRA - original code denied admin user if the share was
	   marked read_only. Changed as I don't think this is needed,
	   but old code left in case there is a problem here.
	*/
	if (user_in_list(conn->user,lp_admin_users(conn->service), groups, n_groups) 
#if 0
	    && !conn->read_only
#endif
	    ) {
		conn->admin_user = True;
		conn->force_user = True;  /* Admin users are effectivly 'forced' */
		DEBUG(0,("%s logged in as admin user (root privileges)\n",conn->user));
	} else {
		conn->admin_user = False;
	}

#if 0 /* This done later, for now */    
	/* admin users always run as uid=0 */
	if (conn->admin_user) {
		conn->uid = 0;
	}
#endif
}

/****************************************************************************
  Make a connection, given the snum to connect to, and the vuser of the
  connecting user if appropriate.
****************************************************************************/

static connection_struct *make_connection_snum(int snum, user_struct *vuser,
					       DATA_BLOB password, 
					       const char *pdev, NTSTATUS *status)
{
	struct passwd *pass = NULL;
	BOOL guest = False;
	connection_struct *conn;
	struct stat st;
	fstring user;
	fstring dev;

	*user = 0;
	fstrcpy(dev, pdev);

	if (NT_STATUS_IS_ERR(*status = share_sanity_checks(snum, dev))) {
		return NULL;
	}	

	conn = conn_new();
	if (!conn) {
		DEBUG(0,("Couldn't find free connection.\n"));
		*status = NT_STATUS_INSUFFICIENT_RESOURCES;
		return NULL;
	}

	if (lp_guest_only(snum)) {
		const char *guestname = lp_guestaccount();
		guest = True;
		pass = getpwnam_alloc(guestname);
		if (!pass) {
			DEBUG(0,("make_connection_snum: Invalid guest account %s??\n",guestname));
			conn_free(conn);
			*status = NT_STATUS_NO_SUCH_USER;
			return NULL;
		}
		fstrcpy(user,pass->pw_name);
		conn->force_user = True;
		conn->uid = pass->pw_uid;
		conn->gid = pass->pw_gid;
		string_set(&conn->user,pass->pw_name);
		passwd_free(&pass);
		DEBUG(3,("Guest only user %s\n",user));
	} else if (vuser) {
		if (vuser->guest) {
			if (!lp_guest_ok(snum)) {
				DEBUG(2, ("guest user (from session setup) not permitted to access this share (%s)\n", lp_servicename(snum)));
				      conn_free(conn);
				      *status = NT_STATUS_ACCESS_DENIED;
				      return NULL;
			}
		} else {
			if (!user_ok(vuser->user.unix_name, snum, vuser->groups, vuser->n_groups)) {
				DEBUG(2, ("user '%s' (from session setup) not permitted to access this share (%s)\n", vuser->user.unix_name, lp_servicename(snum)));
				conn_free(conn);
				*status = NT_STATUS_ACCESS_DENIED;
				return NULL;
			}
		}
		conn->vuid = vuser->vuid;
		conn->uid = vuser->uid;
		conn->gid = vuser->gid;
		string_set(&conn->user,vuser->user.unix_name);
		fstrcpy(user,vuser->user.unix_name);
		guest = vuser->guest; 
	} else if (lp_security() == SEC_SHARE) {
		/* add it as a possible user name if we 
		   are in share mode security */
		add_session_user(lp_servicename(snum));
		/* shall we let them in? */
		if (!authorise_login(snum,user,password,&guest)) {
			DEBUG( 2, ( "Invalid username/password for [%s]\n", 
				    lp_servicename(snum)) );
			conn_free(conn);
			*status = NT_STATUS_WRONG_PASSWORD;
			return NULL;
		}
		pass = Get_Pwnam(user);
		conn->force_user = True;
		conn->uid = pass->pw_uid;
		conn->gid = pass->pw_gid;
		string_set(&conn->user, pass->pw_name);
		fstrcpy(user, pass->pw_name);

	} else {
		DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
		conn_free(conn);
		*status = NT_STATUS_ACCESS_DENIED;
		return NULL;
	}

	add_session_user(user);

	safe_strcpy(conn->client_address, client_addr(), 
		    sizeof(conn->client_address)-1);
	conn->num_files_open = 0;
	conn->lastused = time(NULL);
	conn->service = snum;
	conn->used = True;
	conn->printer = (strncmp(dev,"LPT",3) == 0);
	conn->ipc = ((strncmp(dev,"IPC",3) == 0) || strequal(dev,"ADMIN$"));
	conn->dirptr = NULL;
	conn->veto_list = NULL;
	conn->hide_list = NULL;
	conn->veto_oplock_list = NULL;
	string_set(&conn->dirpath,"");
	string_set(&conn->user,user);
	conn->nt_user_token = NULL;
	
	set_read_only(conn, vuser ? vuser->groups : NULL, vuser ? vuser->n_groups : 0);
	
	set_admin_user(conn, vuser ? vuser->groups : NULL, vuser ? vuser->n_groups : 0);

	/*
	 * If force user is true, then store the
	 * given userid and also the groups
	 * of the user we're forcing.
	 */
	
	if (*lp_force_user(snum)) {
		struct passwd *pass2;
		pstring fuser;
		pstrcpy(fuser,lp_force_user(snum));

		/* Allow %S to be used by force user. */
		pstring_sub(fuser,"%S",lp_servicename(snum));

		pass2 = (struct passwd *)Get_Pwnam(fuser);
		if (pass2) {
			conn->uid = pass2->pw_uid;
			conn->gid = pass2->pw_gid;
			string_set(&conn->user,pass2->pw_name);
			fstrcpy(user,pass2->pw_name);
			conn->force_user = True;
			DEBUG(3,("Forced user %s\n",user));	  
		} else {
			DEBUG(1,("Couldn't find user %s\n",fuser));
			conn_free(conn);
			*status = NT_STATUS_NO_SUCH_USER;
			return NULL;
		}
	}

	/* admin users always run as uid=0 */
	if (conn->admin_user) {
		conn->uid = 0;
	}

#ifdef HAVE_GETGRNAM 
	/*
	 * If force group is true, then override
	 * any groupid stored for the connecting user.
	 */
	
	if (*lp_force_group(snum)) {
		gid_t gid;
		pstring gname;
		pstring tmp_gname;
		BOOL user_must_be_member = False;
		
		pstrcpy(tmp_gname,lp_force_group(snum));
		
		if (tmp_gname[0] == '+') {
			user_must_be_member = True;
			/* even now, tmp_gname is null terminated */
			pstrcpy(gname,&tmp_gname[1]);
		} else {
			pstrcpy(gname,tmp_gname);
		}
		/* default service may be a group name 		*/
		pstring_sub(gname,"%S",lp_servicename(snum));
		gid = nametogid(gname);
		
		if (gid != (gid_t)-1) {

			/*
			 * If the user has been forced and the forced group starts
			 * with a '+', then we only set the group to be the forced
			 * group if the forced user is a member of that group.
			 * Otherwise, the meaning of the '+' would be ignored.
			 */
			if (conn->force_user && user_must_be_member) {
				if (user_in_group_list( user, gname, NULL, 0)) {
						conn->gid = gid;
						DEBUG(3,("Forced group %s for member %s\n",gname,user));
				}
			} else {
				conn->gid = gid;
				DEBUG(3,("Forced group %s\n",gname));
			}
			conn->force_group = True;
		} else {
			DEBUG(1,("Couldn't find group %s\n",gname));
			conn_free(conn);
			*status = NT_STATUS_NO_SUCH_GROUP;
			return NULL;
		}
	}
#endif /* HAVE_GETGRNAM */

	{
		pstring s;
		pstrcpy(s,lp_pathname(snum));
		standard_sub_conn(conn,s,sizeof(s));
		string_set(&conn->connectpath,s);
		DEBUG(3,("Connect path is '%s' for service [%s]\n",s, lp_servicename(snum)));
	}

	if (conn->force_user || conn->force_group) {

		/* groups stuff added by ih */
		conn->ngroups = 0;
		conn->groups = NULL;
		
		/* Find all the groups this uid is in and
		   store them. Used by change_to_user() */
		initialise_groups(conn->user, conn->uid, conn->gid); 
		get_current_groups(conn->gid, &conn->ngroups,&conn->groups);
		
		conn->nt_user_token = create_nt_token(conn->uid, conn->gid, 
						      conn->ngroups, conn->groups,
						      guest);
	}

	/*
	 * New code to check if there's a share security descripter
	 * added from NT server manager. This is done after the
	 * smb.conf checks are done as we need a uid and token. JRA.
	 *
	 */

	{
		BOOL can_write = share_access_check(conn, snum, vuser, FILE_WRITE_DATA);

		if (!can_write) {
			if (!share_access_check(conn, snum, vuser, FILE_READ_DATA)) {
				/* No access, read or write. */
				DEBUG(0,( "make_connection: connection to %s denied due to security descriptor.\n",
					  lp_servicename(snum)));
				conn_free(conn);
				*status = NT_STATUS_ACCESS_DENIED;
				return NULL;
			} else {
				conn->read_only = True;
			}
		}
	}
	/* Initialise VFS function pointers */

	if (!smbd_vfs_init(conn)) {
		DEBUG(0, ("vfs_init failed for service %s\n", lp_servicename(SNUM(conn))));
		conn_free(conn);
		*status = NT_STATUS_BAD_NETWORK_NAME;
		return NULL;
	}

/* ROOT Activities: */	
	/* check number of connections */
	if (!claim_connection(conn,
			      lp_servicename(SNUM(conn)),
			      lp_max_connections(SNUM(conn)),
			      False,0)) {
		DEBUG(1,("too many connections - rejected\n"));
		conn_free(conn);
		*status = NT_STATUS_INSUFFICIENT_RESOURCES;
		return NULL;
	}  

	/* Preexecs are done here as they might make the dir we are to ChDir to below */
	/* execute any "root preexec = " line */
	if (*lp_rootpreexec(SNUM(conn))) {
		int ret;
		pstring cmd;
		pstrcpy(cmd,lp_rootpreexec(SNUM(conn)));
		standard_sub_conn(conn,cmd,sizeof(cmd));
		DEBUG(5,("cmd=%s\n",cmd));
		ret = smbrun(cmd,NULL);
		if (ret != 0 && lp_rootpreexec_close(SNUM(conn))) {
			DEBUG(1,("root preexec gave %d - failing connection\n", ret));
			yield_connection(conn, lp_servicename(SNUM(conn)));
			conn_free(conn);
			*status = NT_STATUS_ACCESS_DENIED;
			return NULL;
		}
	}

/* USER Activites: */
	if (!change_to_user(conn, conn->vuid)) {
		/* No point continuing if they fail the basic checks */
		DEBUG(0,("Can't become connected user!\n"));
		conn_free(conn);
		*status = NT_STATUS_LOGON_FAILURE;
		return NULL;
	}

	/* Remember that a different vuid can connect later without these checks... */
	
	/* Preexecs are done here as they might make the dir we are to ChDir to below */
	/* execute any "preexec = " line */
	if (*lp_preexec(SNUM(conn))) {
		int ret;
		pstring cmd;
		pstrcpy(cmd,lp_preexec(SNUM(conn)));
		standard_sub_conn(conn,cmd,sizeof(cmd));
		ret = smbrun(cmd,NULL);
		if (ret != 0 && lp_preexec_close(SNUM(conn))) {
			DEBUG(1,("preexec gave %d - failing connection\n", ret));
			change_to_root_user();
			yield_connection(conn, lp_servicename(SNUM(conn)));
			conn_free(conn);
			*status = NT_STATUS_ACCESS_DENIED;
			return NULL;
		}
	}

#ifdef WITH_FAKE_KASERVER
	if (lp_afs_share(SNUM(conn))) {
		afs_login(conn);
	}
#endif
	
#if CHECK_PATH_ON_TCONX
	/* win2000 does not check the permissions on the directory
	   during the tree connect, instead relying on permission
	   check during individual operations. To match this behaviour
	   I have disabled this chdir check (tridge) */
	if (vfs_ChDir(conn,conn->connectpath) != 0) {
		DEBUG(0,("%s (%s) Can't change directory to %s (%s)\n",
			 get_remote_machine_name(), conn->client_address,
			 conn->connectpath,strerror(errno)));
		change_to_root_user();
		yield_connection(conn, lp_servicename(SNUM(conn)));
		conn_free(conn);
		*status = NT_STATUS_BAD_NETWORK_NAME;
		return NULL;
	}
#else
	/* the alternative is just to check the directory exists */
	if (stat(conn->connectpath, &st) != 0 || !S_ISDIR(st.st_mode)) {
		DEBUG(0,("'%s' does not exist or is not a directory, when connecting to [%s]\n", conn->connectpath, lp_servicename(SNUM(conn))));
		change_to_root_user();
		yield_connection(conn, lp_servicename(SNUM(conn)));
		conn_free(conn);
		*status = NT_STATUS_BAD_NETWORK_NAME;
		return NULL;
	}
#endif
	
	string_set(&conn->origpath,conn->connectpath);
	
#if SOFTLINK_OPTIMISATION
	/* resolve any soft links early if possible */
	if (vfs_ChDir(conn,conn->connectpath) == 0) {
		pstring s;
		pstrcpy(s,conn->connectpath);
		vfs_GetWd(conn,s);
		string_set(&conn->connectpath,s);
		vfs_ChDir(conn,conn->connectpath);
	}
#endif
	
	/*
	 * Print out the 'connected as' stuff here as we need
	 * to know the effective uid and gid we will be using
	 * (at least initially).
	 */

	if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
		dbgtext( "%s (%s) ", get_remote_machine_name(), conn->client_address );
		dbgtext( "%s", srv_is_signing_active() ? "signed " : "");
		dbgtext( "connect to service %s ", lp_servicename(SNUM(conn)) );
		dbgtext( "initially as user %s ", user );
		dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
		dbgtext( "(pid %d)\n", (int)sys_getpid() );
	}
	
	/* Add veto/hide lists */
	if (!IS_IPC(conn) && !IS_PRINT(conn)) {
		set_namearray( &conn->veto_list, lp_veto_files(SNUM(conn)));
		set_namearray( &conn->hide_list, lp_hide_files(SNUM(conn)));
		set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(SNUM(conn)));
	}
	
	/* Invoke VFS make connection hook */

	if (SMB_VFS_CONNECT(conn, lp_servicename(snum), user) < 0) {
		DEBUG(0,("make_connection: VFS make connection failed!\n"));
		change_to_root_user();
		conn_free(conn);
		*status = NT_STATUS_UNSUCCESSFUL;
		return NULL;
	}

	/* we've finished with the user stuff - go back to root */
	change_to_root_user();
            
	return(conn);
}

/***************************************************************************************
 Simple wrapper function for make_connection() to include a call to 
 vfs_chdir()
 **************************************************************************************/
 
connection_struct *make_connection_with_chdir(const char *service_in, DATA_BLOB password, 
				   const char *dev, uint16 vuid, NTSTATUS *status)
{
	connection_struct *conn = NULL;
	
	conn = make_connection(service_in, password, dev, vuid, status);
	
	/*
	 * make_connection() does not change the directory for us any more
	 * so we have to do it as a separate step  --jerry
	 */
	 
	if ( conn && vfs_ChDir(conn,conn->connectpath) != 0 ) {
		DEBUG(0,("move_driver_to_download_area: Can't change directory to %s for [print$] (%s)\n",
			 conn->connectpath,strerror(errno)));
		yield_connection(conn, lp_servicename(SNUM(conn)));
		conn_free(conn);
		*status = NT_STATUS_UNSUCCESSFUL;
		return NULL;
	}
	
	return conn;
}

/****************************************************************************
 Make a connection to a service.
 *
 * @param service 
****************************************************************************/

connection_struct *make_connection(const char *service_in, DATA_BLOB password, 
				   const char *pdev, uint16 vuid, NTSTATUS *status)
{
	uid_t euid;
	user_struct *vuser = NULL;
	fstring service;
	fstring dev;
	int snum = -1;

	fstrcpy(dev, pdev);

	/* This must ONLY BE CALLED AS ROOT. As it exits this function as root. */
	if (!non_root_mode() && (euid = geteuid()) != 0) {
		DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot (%u)\n", (unsigned int)euid ));
		smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
	}

	if(lp_security() != SEC_SHARE) {
		vuser = get_valid_user_struct(vuid);
		if (!vuser) {
			DEBUG(1,("make_connection: refusing to connect with no session setup\n"));
			*status = NT_STATUS_ACCESS_DENIED;
			return NULL;
		}
	}

	/* Logic to try and connect to the correct [homes] share, preferably without too many
	   getpwnam() lookups.  This is particulary nasty for winbind usernames, where the
	   share name isn't the same as unix username.

	   The snum of the homes share is stored on the vuser at session setup time.
	*/

	if (strequal(service_in,HOMES_NAME)) {
		if(lp_security() != SEC_SHARE) {
			DATA_BLOB no_pw = data_blob(NULL, 0);
			if (vuser->homes_snum == -1) {
				DEBUG(2, ("[homes] share not available for this user because it was not found or created at session setup time\n"));
				*status = NT_STATUS_BAD_NETWORK_NAME;
				return NULL;
			}
			DEBUG(5, ("making a connection to [homes] service created at session setup time\n"));
			return make_connection_snum(vuser->homes_snum,
						    vuser, no_pw, 
						    dev, status);
		} else {
			/* Security = share. Try with current_user_info.smb_name
			 * as the username.  */
			if (*current_user_info.smb_name) {
				fstring unix_username;
				fstrcpy(unix_username,
					current_user_info.smb_name);
				map_username(unix_username);
				snum = find_service(unix_username);
			} 
			if (snum != -1) {
				DEBUG(5, ("making a connection to 'homes' service %s based on security=share\n", service_in));
				return make_connection_snum(snum, NULL,
							    password,
							    dev, status);
			}
		}
	} else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
		   && strequal(service_in, lp_servicename(vuser->homes_snum))) {
		DATA_BLOB no_pw = data_blob(NULL, 0);
		DEBUG(5, ("making a connection to 'homes' service [%s] created at session setup time\n", service_in));
		return make_connection_snum(vuser->homes_snum,
					    vuser, no_pw, 
					    dev, status);
	}
	
	fstrcpy(service, service_in);

	strlower_m(service);

	snum = find_service(service);

	if (snum < 0) {
		if (strequal(service,"IPC$") || strequal(service,"ADMIN$")) {
			DEBUG(3,("refusing IPC connection to %s\n", service));
			*status = NT_STATUS_ACCESS_DENIED;
			return NULL;
		}

		DEBUG(0,("%s (%s) couldn't find service %s\n",
			 get_remote_machine_name(), client_addr(), service));
		*status = NT_STATUS_BAD_NETWORK_NAME;
		return NULL;
	}

	/* Handle non-Dfs clients attempting connections to msdfs proxy */
	if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0'))  {
		DEBUG(3, ("refusing connection to dfs proxy '%s'\n", service));
		*status = NT_STATUS_BAD_NETWORK_NAME;
		return NULL;
	}

	DEBUG(5, ("making a connection to 'normal' service %s\n", service));

	return make_connection_snum(snum, vuser,
				    password,
				    dev, status);
}

/****************************************************************************
close a cnum
****************************************************************************/
void close_cnum(connection_struct *conn, uint16 vuid)
{
	DirCacheFlush(SNUM(conn));

	change_to_root_user();

	DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
				 get_remote_machine_name(),conn->client_address,
				 lp_servicename(SNUM(conn))));

	/* Call VFS disconnect hook */    
	SMB_VFS_DISCONNECT(conn);

	yield_connection(conn, lp_servicename(SNUM(conn)));

	file_close_conn(conn);
	dptr_closecnum(conn);

	/* execute any "postexec = " line */
	if (*lp_postexec(SNUM(conn)) && 
	    change_to_user(conn, vuid))  {
		pstring cmd;
		pstrcpy(cmd,lp_postexec(SNUM(conn)));
		standard_sub_conn(conn,cmd,sizeof(cmd));
		smbrun(cmd,NULL);
		change_to_root_user();
	}

	change_to_root_user();
	/* execute any "root postexec = " line */
	if (*lp_rootpostexec(SNUM(conn)))  {
		pstring cmd;
		pstrcpy(cmd,lp_rootpostexec(SNUM(conn)));
		standard_sub_conn(conn,cmd,sizeof(cmd));
		smbrun(cmd,NULL);
	}

	/* make sure we leave the directory available for unmount */
	vfs_ChDir(conn, "/");

	conn_free(conn);
}