summaryrefslogtreecommitdiff
path: root/source3/smbd/service.c
blob: 2214ac0a2dd8657c22ec6dd870e7a112c3ac7bda (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
/* 
   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 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "system/filesys.h"
#include "system/passwd.h" /* uid_wrapper */
#include "../lib/tsocket/tsocket.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "../librpc/gen_ndr/netlogon.h"
#include "../libcli/security/security.h"
#include "printing/pcap.h"
#include "passdb/lookup_sid.h"
#include "auth.h"
#include "lib/param/loadparm.h"
#include "messages.h"

static bool canonicalize_connect_path(connection_struct *conn)
{
	bool ret;
	char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath);
	if (!resolved_name) {
		return false;
	}
	ret = set_conn_connectpath(conn,resolved_name);
	SAFE_FREE(resolved_name);
	return ret;
}

/****************************************************************************
 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
 absolute path stating in / and not ending in /.
 Observent people will notice a similarity between this and check_path_syntax :-).
****************************************************************************/

bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
{
	char *destname;
	char *d;
	const char *s = connectpath;
        bool start_of_name_component = true;

	if (connectpath == NULL || connectpath[0] == '\0') {
		return false;
	}

	/* Allocate for strlen + '\0' + possible leading '/' */
	destname = (char *)talloc_size(conn, strlen(connectpath) + 2);
	if (!destname) {
		return false;
	}
	d = destname;

	*d++ = '/'; /* Always start with root. */

	while (*s) {
		if (*s == '/') {
			/* Eat multiple '/' */
			while (*s == '/') {
                                s++;
                        }
			if ((d > destname + 1) && (*s != '\0')) {
				*d++ = '/';
			}
			start_of_name_component = True;
			continue;
		}

		if (start_of_name_component) {
			if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
				/* Uh oh - "/../" or "/..\0" ! */

				/* Go past the ../ or .. */
				if (s[2] == '/') {
					s += 3;
				} else {
					s += 2; /* Go past the .. */
				}

				/* If  we just added a '/' - delete it */
				if ((d > destname) && (*(d-1) == '/')) {
					*(d-1) = '\0';
					d--;
				}

				/* Are we at the start ? Can't go back further if so. */
				if (d <= destname) {
					*d++ = '/'; /* Can't delete root */
					continue;
				}
				/* Go back one level... */
				/* Decrement d first as d points to the *next* char to write into. */
				for (d--; d > destname; d--) {
					if (*d == '/') {
						break;
					}
				}
				/* We're still at the start of a name component, just the previous one. */
				continue;
			} else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
				/* Component of pathname can't be "." only - skip the '.' . */
				if (s[1] == '/') {
					s += 2;
				} else {
					s++;
				}
				continue;
			}
		}

		if (!(*s & 0x80)) {
			*d++ = *s++;
		} else {
			size_t siz;
			/* Get the size of the next MB character. */
			next_codepoint(s,&siz);
			switch(siz) {
				case 5:
					*d++ = *s++;
					/*fall through*/
				case 4:
					*d++ = *s++;
					/*fall through*/
				case 3:
					*d++ = *s++;
					/*fall through*/
				case 2:
					*d++ = *s++;
					/*fall through*/
				case 1:
					*d++ = *s++;
					break;
				default:
					break;
			}
		}
		start_of_name_component = false;
	}
	*d = '\0';

	/* And must not end in '/' */
	if (d > destname + 1 && (*(d-1) == '/')) {
		*(d-1) = '\0';
	}

	DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
		lp_servicename(talloc_tos(), SNUM(conn)), destname ));

	talloc_free(conn->connectpath);
	conn->connectpath = destname;
	/* Ensure conn->cwd is initialized - start as conn->connectpath. */
	TALLOC_FREE(conn->cwd);
	conn->cwd = talloc_strdup(conn, conn->connectpath);
	if (!conn->cwd) {
		return false;
	}
	return true;
}

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

bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
{
	int snum;

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

	conn->lastused_count++;

	snum = SNUM(conn);

	if (do_chdir &&
	    vfs_ChDir(conn,conn->connectpath) != 0 &&
	    vfs_ChDir(conn,conn->origpath) != 0) {
                DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
                         conn->connectpath, strerror(errno)));
		return(False);
	}

	if ((conn == last_conn) && (last_flags == flags)) {
		return(True);
	}

	last_conn = conn;
	last_flags = flags;

	/* Obey the client case sensitivity requests - only for clients that support it. */
	switch (lp_casesensitive(snum)) {
		case Auto:
			{
				/* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
				enum remote_arch_types ra_type = get_remote_arch();
				if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
					/* Client can't support per-packet case sensitive pathnames. */
					conn->case_sensitive = False;
				} else {
					conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
				}
			}
			break;
		case True:
			conn->case_sensitive = True;
			break;
		default:
			conn->case_sensitive = False;
			break;
	}
	return(True);
}

/****************************************************************************
 do some basic sainity checks on the share.  
 This function modifies dev, ecode.
****************************************************************************/

static NTSTATUS share_sanity_checks(const struct tsocket_address *remote_address,
				    const char *rhost,
				    int snum,
				    fstring dev)
{
	char *raddr;

	raddr = tsocket_address_inet_addr_string(remote_address,
						 talloc_tos());
	if (raddr == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	if (!lp_snum_ok(snum) ||
	    !allow_access(lp_hostsdeny(snum), lp_hostsallow(snum),
			  rhost, raddr)) {
		return NT_STATUS_ACCESS_DENIED;
	}

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

	if (!strupper_m(dev)) {
		DEBUG(2,("strupper_m %s failed\n", dev));
		return NT_STATUS_INVALID_PARAMETER;
	}

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

/*
 * Go through lookup_name etc to find the force'd group.  
 *
 * Create a new token from src_token, replacing the primary group sid with the
 * one found.
 */

static NTSTATUS find_forced_group(bool force_user,
				  int snum, const char *username,
				  struct dom_sid *pgroup_sid,
				  gid_t *pgid)
{
	NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
	TALLOC_CTX *frame = talloc_stackframe();
	struct dom_sid group_sid;
	enum lsa_SidType type;
	char *groupname;
	bool user_must_be_member = False;
	gid_t gid;

	groupname = lp_force_group(talloc_tos(), snum);
	if (groupname == NULL) {
		DEBUG(1, ("talloc_strdup failed\n"));
		result = NT_STATUS_NO_MEMORY;
		goto done;
	}

	if (groupname[0] == '+') {
		user_must_be_member = True;
		groupname += 1;
	}

	groupname = talloc_string_sub(talloc_tos(), groupname,
				      "%S", lp_servicename(talloc_tos(), snum));
	if (groupname == NULL) {
		DEBUG(1, ("talloc_string_sub failed\n"));
		result = NT_STATUS_NO_MEMORY;
		goto done;
	}

	if (!lookup_name_smbconf(talloc_tos(), groupname,
			 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
			 NULL, NULL, &group_sid, &type)) {
		DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
			   groupname));
		goto done;
	}

	if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
	    (type != SID_NAME_WKN_GRP)) {
		DEBUG(10, ("%s is a %s, not a group\n", groupname,
			   sid_type_lookup(type)));
		goto done;
	}

	if (!sid_to_gid(&group_sid, &gid)) {
		DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
			   sid_string_dbg(&group_sid), groupname));
		goto done;
	}

	/*
	 * 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 (force_user && user_must_be_member) {
		if (user_in_group_sid(username, &group_sid)) {
			sid_copy(pgroup_sid, &group_sid);
			*pgid = gid;
			DEBUG(3,("Forced group %s for member %s\n",
				 groupname, username));
		} else {
			DEBUG(0,("find_forced_group: forced user %s is not a member "
				"of forced group %s. Disallowing access.\n",
				username, groupname ));
			result = NT_STATUS_MEMBER_NOT_IN_GROUP;
			goto done;
		}
	} else {
		sid_copy(pgroup_sid, &group_sid);
		*pgid = gid;
		DEBUG(3,("Forced group %s\n", groupname));
	}

	result = NT_STATUS_OK;
 done:
	TALLOC_FREE(frame);
	return result;
}

/****************************************************************************
  Create an auth_session_info structure for a connection_struct
****************************************************************************/

static NTSTATUS create_connection_session_info(struct smbd_server_connection *sconn,
					      TALLOC_CTX *mem_ctx, int snum,
                                              struct auth_session_info *session_info,
                                              struct auth_session_info **presult)
{
	struct auth_session_info *result;

        if (lp_guest_only(snum)) {
                return make_session_info_guest(mem_ctx, presult);
        }

	/*
	 * This is the normal security != share case where we have a
	 * valid vuid from the session setup.                 */

	if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
		if (!lp_guest_ok(snum)) {
			DEBUG(2, ("guest user (from session setup) "
				  "not permitted to access this share "
				  "(%s)\n", lp_servicename(talloc_tos(), snum)));
			return NT_STATUS_ACCESS_DENIED;
		}
	} else {
		if (!user_ok_token(session_info->unix_info->unix_name,
				   session_info->info->domain_name,
				   session_info->security_token, snum)) {
			DEBUG(2, ("user '%s' (from session setup) not "
				  "permitted to access this share "
				  "(%s)\n",
				  session_info->unix_info->unix_name,
				  lp_servicename(talloc_tos(), snum)));
			return NT_STATUS_ACCESS_DENIED;
		}
	}

	result = copy_session_info(mem_ctx, session_info);
	if (result == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	*presult = result;
	return NT_STATUS_OK;
}

/****************************************************************************
  set relavent user and group settings corresponding to force user/group
  configuration for the given snum.
****************************************************************************/

NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
{
	NTSTATUS status;

	if (*lp_force_user(talloc_tos(), snum)) {

		/*
		 * Replace conn->session_info with a completely faked up one
		 * from the username we are forced into :-)
		 */

		char *fuser;
		char *sanitized_username;
		struct auth_session_info *forced_serverinfo;
		bool guest;

		fuser = talloc_string_sub(conn, lp_force_user(talloc_tos(), snum), "%S",
					  lp_const_servicename(snum));
		if (fuser == NULL) {
			return NT_STATUS_NO_MEMORY;
		}

		guest = security_session_user_level(conn->session_info, NULL) < SECURITY_USER;

		status = make_session_info_from_username(
			conn, fuser,
			guest,
			&forced_serverinfo);
		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		/* We don't want to replace the original sanitized_username
		   as it is the original user given in the connect attempt.
		   This is used in '%U' substitutions. */
		sanitized_username = discard_const_p(char,
			forced_serverinfo->unix_info->sanitized_username);
		TALLOC_FREE(sanitized_username);
		forced_serverinfo->unix_info->sanitized_username =
			talloc_move(forced_serverinfo->unix_info,
				&conn->session_info->unix_info->sanitized_username);

		TALLOC_FREE(conn->session_info);
		conn->session_info = forced_serverinfo;

		conn->force_user = true;
		DEBUG(3,("Forced user %s\n", fuser));
	}

	/*
	 * If force group is true, then override
	 * any groupid stored for the connecting user.
	 */

	if (*lp_force_group(talloc_tos(), snum)) {

		status = find_forced_group(
			conn->force_user, snum, conn->session_info->unix_info->unix_name,
			&conn->session_info->security_token->sids[1],
			&conn->session_info->unix_token->gid);

		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		/*
		 * We need to cache this gid, to use within
		 * change_to_user() separately from the conn->session_info
		 * struct. We only use conn->session_info directly if
		 * "force_user" was set.
		 */
		conn->force_group_gid = conn->session_info->unix_token->gid;
	}

	return NT_STATUS_OK;
}

/****************************************************************************
  Setup the share access mask for a connection.
****************************************************************************/

static void create_share_access_mask(connection_struct *conn, int snum)
{
	const struct security_token *token = conn->session_info->security_token;

	share_access_check(token,
			lp_servicename(talloc_tos(), snum),
			MAXIMUM_ALLOWED_ACCESS,
			&conn->share_access);

	if (!CAN_WRITE(conn)) {
		conn->share_access &=
			~(SEC_FILE_WRITE_DATA | SEC_FILE_APPEND_DATA |
			  SEC_FILE_WRITE_EA | SEC_FILE_WRITE_ATTRIBUTE |
			  SEC_DIR_DELETE_CHILD );
	}

	if (security_token_has_privilege(token, SEC_PRIV_SECURITY)) {
		conn->share_access |= SEC_FLAG_SYSTEM_SECURITY;
	}
	if (security_token_has_privilege(token, SEC_PRIV_RESTORE)) {
		conn->share_access |= (SEC_RIGHTS_PRIV_RESTORE);
	}
	if (security_token_has_privilege(token, SEC_PRIV_BACKUP)) {
		conn->share_access |= (SEC_RIGHTS_PRIV_BACKUP);
	}
	if (security_token_has_privilege(token, SEC_PRIV_TAKE_OWNERSHIP)) {
		conn->share_access |= (SEC_STD_WRITE_OWNER);
	}
}

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

static NTSTATUS make_connection_snum(struct smbd_server_connection *sconn,
					connection_struct *conn,
					int snum, struct user_struct *vuser,
					const char *pdev)
{
	struct smb_filename *smb_fname_cpath = NULL;
	fstring dev;
	int ret;
	bool on_err_call_dis_hook = false;
	uid_t effuid;
	gid_t effgid;
	NTSTATUS status;

	fstrcpy(dev, pdev);

	status = share_sanity_checks(sconn->remote_address,
				       sconn->remote_hostname,
				       snum,
				       dev);
	if (NT_STATUS_IS_ERR(status)) {
		goto err_root_exit;
	}

	conn->params->service = snum;

	status = create_connection_session_info(sconn,
		conn, snum, vuser->session_info,
		&conn->session_info);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("create_connection_session_info failed: %s\n",
			  nt_errstr(status)));
		goto err_root_exit;
	}

	if (lp_guest_only(snum)) {
		conn->force_user = true;
	}

	conn->num_files_open = 0;
	conn->lastused = conn->lastused_count = time(NULL);
	conn->printer = (strncmp(dev,"LPT",3) == 0);
	conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
		      ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );

	/* Case options for the share. */
	if (lp_casesensitive(snum) == Auto) {
		/* We will be setting this per packet. Set to be case
		 * insensitive for now. */
		conn->case_sensitive = False;
	} else {
		conn->case_sensitive = (bool)lp_casesensitive(snum);
	}

	conn->case_preserve = lp_preservecase(snum);
	conn->short_case_preserve = lp_shortpreservecase(snum);

	conn->encrypt_level = lp_smb_encrypt(snum);

	conn->veto_list = NULL;
	conn->hide_list = NULL;
	conn->veto_oplock_list = NULL;
	conn->aio_write_behind_list = NULL;

	conn->read_only = lp_readonly(SNUM(conn));

	status = set_conn_force_user_group(conn, snum);
	if (!NT_STATUS_IS_OK(status)) {
		goto err_root_exit;
	}

	conn->vuid = vuser->vuid;

	{
		char *s = talloc_sub_advanced(talloc_tos(),
					lp_servicename(talloc_tos(), SNUM(conn)),
					conn->session_info->unix_info->unix_name,
					conn->connectpath,
					conn->session_info->unix_token->gid,
					conn->session_info->unix_info->sanitized_username,
					conn->session_info->info->domain_name,
					lp_pathname(talloc_tos(), snum));
		if (!s) {
			status = NT_STATUS_NO_MEMORY;
			goto err_root_exit;
		}

		if (!set_conn_connectpath(conn,s)) {
			TALLOC_FREE(s);
			status = NT_STATUS_NO_MEMORY;
			goto err_root_exit;
		}
		DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
			 lp_servicename(talloc_tos(), snum)));
		TALLOC_FREE(s);
	}

	/*
	 * 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.
	 *
	 */

	create_share_access_mask(conn, snum);

	if ((conn->share_access & FILE_WRITE_DATA) == 0) {
		if ((conn->share_access & FILE_READ_DATA) == 0) {
			/* No access, read or write. */
			DEBUG(0,("make_connection: connection to %s "
				 "denied due to security "
				 "descriptor.\n",
				 lp_servicename(talloc_tos(), snum)));
			status = NT_STATUS_ACCESS_DENIED;
			goto err_root_exit;
		} 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(talloc_tos(), snum)));
		status = NT_STATUS_BAD_NETWORK_NAME;
		goto err_root_exit;
	}

/* ROOT Activities: */
	/* explicitly check widelinks here so that we can correctly warn
	 * in the logs. */
	widelinks_warning(snum);

	/*
	 * Enforce the max connections parameter.
	 */

	if ((lp_max_connections(snum) > 0)
	    && (count_current_connections(lp_servicename(talloc_tos(), SNUM(conn)), True) >=
		lp_max_connections(snum))) {

		DEBUG(1, ("Max connections (%d) exceeded for %s\n",
			  lp_max_connections(snum),
			  lp_servicename(talloc_tos(), snum)));
		status = NT_STATUS_INSUFFICIENT_RESOURCES;
		goto err_root_exit;
	}

	/* Invoke VFS make connection hook - this must be the first
	   filesystem operation that we do. */

	if (SMB_VFS_CONNECT(conn, lp_servicename(talloc_tos(), snum),
			    conn->session_info->unix_info->unix_name) < 0) {
		DEBUG(0,("make_connection: VFS make connection failed!\n"));
		status = NT_STATUS_UNSUCCESSFUL;
		goto err_root_exit;
	}

	/* Any error exit after here needs to call the disconnect hook. */
	on_err_call_dis_hook = true;

	if ((!conn->printer) && (!conn->ipc) &&
	    lp_change_notify(conn->params)) {
		if (sconn->notify_ctx == NULL) {
			sconn->notify_ctx = notify_init(
				sconn, sconn->msg_ctx, sconn->ev_ctx);
		}
		if (sconn->sys_notify_ctx == NULL) {
			sconn->sys_notify_ctx = sys_notify_context_create(
				sconn, sconn->ev_ctx);
		}
	}

	if (lp_kernel_oplocks(snum)) {
		init_kernel_oplocks(conn->sconn);
	}

	/*
	 * Fix compatibility issue pointed out by Volker.
	 * We pass the conn->connectpath to the preexec
	 * scripts as a parameter, so attempt to canonicalize
	 * it here before calling the preexec scripts.
	 * We ignore errors here, as it is possible that
	 * the conn->connectpath doesn't exist yet and
	 * the preexec scripts will create them.
	 */

	(void)canonicalize_connect_path(conn);

	/* Preexecs are done here as they might make the dir we are to ChDir
	 * to below */
	/* execute any "root preexec = " line */
	if (*lp_rootpreexec(talloc_tos(), snum)) {
		char *cmd = talloc_sub_advanced(talloc_tos(),
					lp_servicename(talloc_tos(), SNUM(conn)),
					conn->session_info->unix_info->unix_name,
					conn->connectpath,
					conn->session_info->unix_token->gid,
					conn->session_info->unix_info->sanitized_username,
					conn->session_info->info->domain_name,
					lp_rootpreexec(talloc_tos(), snum));
		DEBUG(5,("cmd=%s\n",cmd));
		ret = smbrun(cmd,NULL);
		TALLOC_FREE(cmd);
		if (ret != 0 && lp_rootpreexec_close(snum)) {
			DEBUG(1,("root preexec gave %d - failing "
				 "connection\n", ret));
			status = NT_STATUS_ACCESS_DENIED;
			goto err_root_exit;
		}
	}

/* 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"));
		status = NT_STATUS_LOGON_FAILURE;
		goto err_root_exit;
	}

	effuid = geteuid();
	effgid = getegid();

	/* 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(talloc_tos(), snum)) {
		char *cmd = talloc_sub_advanced(talloc_tos(),
					lp_servicename(talloc_tos(), SNUM(conn)),
					conn->session_info->unix_info->unix_name,
					conn->connectpath,
					conn->session_info->unix_token->gid,
					conn->session_info->unix_info->sanitized_username,
					conn->session_info->info->domain_name,
					lp_preexec(talloc_tos(), snum));
		ret = smbrun(cmd,NULL);
		TALLOC_FREE(cmd);
		if (ret != 0 && lp_preexec_close(snum)) {
			DEBUG(1,("preexec gave %d - failing connection\n",
				 ret));
			status = NT_STATUS_ACCESS_DENIED;
			goto err_root_exit;
		}
	}

#ifdef WITH_FAKE_KASERVER
	if (lp_afs_share(snum)) {
		afs_login(conn);
	}
#endif

	/*
	 * we've finished with the user stuff - go back to root
	 * so the SMB_VFS_STAT call will only fail on path errors,
	 * not permission problems.
	 */
	change_to_root_user();
/* ROOT Activites: */

	/*
	 * If widelinks are disallowed we need to canonicalise the connect
	 * path here to ensure we don't have any symlinks in the
	 * connectpath. We will be checking all paths on this connection are
	 * below this directory. We must do this after the VFS init as we
	 * depend on the realpath() pointer in the vfs table. JRA.
	 */
	if (!lp_widelinks(snum)) {
		if (!canonicalize_connect_path(conn)) {
			DEBUG(0, ("canonicalize_connect_path failed "
			"for service %s, path %s\n",
				lp_servicename(talloc_tos(), snum),
				conn->connectpath));
			status = NT_STATUS_BAD_NETWORK_NAME;
			goto err_root_exit;
		}
	}

	/* Add veto/hide lists */
	if (!IS_IPC(conn) && !IS_PRINT(conn)) {
		set_namearray( &conn->veto_list,
			       lp_veto_files(talloc_tos(), snum));
		set_namearray( &conn->hide_list,
			       lp_hide_files(talloc_tos(), snum));
		set_namearray( &conn->veto_oplock_list,
			       lp_veto_oplocks(talloc_tos(), snum));
		set_namearray( &conn->aio_write_behind_list,
				lp_aio_write_behind(talloc_tos(), snum));
	}
	status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
					    NULL, NULL, &smb_fname_cpath);
	if (!NT_STATUS_IS_OK(status)) {
		goto err_root_exit;
	}

	/* 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) */
	/* the alternative is just to check the directory exists */

	if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
	    !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
		if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
			DEBUG(0,("'%s' is not a directory, when connecting to "
				 "[%s]\n", conn->connectpath,
				 lp_servicename(talloc_tos(), snum)));
		} else {
			DEBUG(0,("'%s' does not exist or permission denied "
				 "when connecting to [%s] Error was %s\n",
				 conn->connectpath,
				 lp_servicename(talloc_tos(), snum),
				 strerror(errno) ));
		}
		status = NT_STATUS_BAD_NETWORK_NAME;
		goto err_root_exit;
	}
	conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;

	talloc_free(conn->origpath);
	conn->origpath = talloc_strdup(conn, conn->connectpath);

	/* Figure out the characteristics of the underlying filesystem. This
	 * assumes that all the filesystem mounted withing a share path have
	 * the same characteristics, which is likely but not guaranteed.
	 */

	conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);

	/*
	 * 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(),
			 tsocket_address_string(conn->sconn->remote_address,
						talloc_tos()) );
		dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
		dbgtext( "connect to service %s ",
			 lp_servicename(talloc_tos(), snum) );
		dbgtext( "initially as user %s ",
			 conn->session_info->unix_info->unix_name );
		dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
		dbgtext( "(pid %d)\n", (int)getpid() );
	}

	return status;

  err_root_exit:

	TALLOC_FREE(smb_fname_cpath);
	/* We must exit this function as root. */
	if (geteuid() != 0) {
		change_to_root_user();
	}
	if (on_err_call_dis_hook) {
		/* Call VFS disconnect hook */
		SMB_VFS_DISCONNECT(conn);
	}
	return status;
}

/****************************************************************************
 Make a connection to a service from SMB1. Internal interface.
****************************************************************************/

static connection_struct *make_connection_smb1(struct smbd_server_connection *sconn,
					NTTIME now,
					int snum, struct user_struct *vuser,
					const char *pdev,
					NTSTATUS *pstatus)
{
	struct smbXsrv_tcon *tcon;
	NTSTATUS status;
	struct connection_struct *conn;

	status = smb1srv_tcon_create(sconn->conn, now, &tcon);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("make_connection_smb1: Couldn't find free tcon %s.\n",
			 nt_errstr(status)));
		*pstatus = status;
		return NULL;
	}

	conn = conn_new(sconn);
	if (!conn) {
		TALLOC_FREE(tcon);

		DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
		*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
		return NULL;
	}

	conn->cnum = tcon->global->tcon_wire_id;
	conn->tcon = tcon;

	*pstatus = make_connection_snum(sconn,
					conn,
					snum,
					vuser,
					pdev);
	if (!NT_STATUS_IS_OK(*pstatus)) {
		conn_free(conn);
		TALLOC_FREE(tcon);
		return NULL;
	}

	tcon->global->share_name = lp_servicename(tcon->global, SNUM(conn));
	if (tcon->global->share_name == NULL) {
		conn_free(conn);
		TALLOC_FREE(tcon);
		*pstatus = NT_STATUS_NO_MEMORY;
		return NULL;
	}
	tcon->global->session_global_id =
		vuser->session->global->session_global_id;

	tcon->compat = talloc_move(tcon, &conn);
	tcon->status = NT_STATUS_OK;

	*pstatus = smbXsrv_tcon_update(tcon);
	if (!NT_STATUS_IS_OK(*pstatus)) {
		TALLOC_FREE(tcon);
		return NULL;
	}

	return tcon->compat;
}

/****************************************************************************
 Make a connection to a service from SMB2. External SMB2 interface.
 We must set cnum before claiming connection.
****************************************************************************/

connection_struct *make_connection_smb2(struct smbd_server_connection *sconn,
					struct smbXsrv_tcon *tcon,
					int snum,
					struct user_struct *vuser,
					const char *pdev,
					NTSTATUS *pstatus)
{
	connection_struct *conn = conn_new(sconn);
	if (!conn) {
		DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
		*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
		return NULL;
	}

	conn->cnum = tcon->global->tcon_wire_id;
	conn->tcon = tcon;

	*pstatus = make_connection_snum(sconn,
					conn,
					snum,
					vuser,
					pdev);
	if (!NT_STATUS_IS_OK(*pstatus)) {
		conn_free(conn);
		return NULL;
	}
	return conn;
}

/****************************************************************************
 Make a connection to a service. External SMB1 interface.
 *
 * @param service 
****************************************************************************/

connection_struct *make_connection(struct smbd_server_connection *sconn,
				   NTTIME now,
				   const char *service_in,
				   const char *pdev, uint64_t vuid,
				   NTSTATUS *status)
{
	uid_t euid;
	struct user_struct *vuser = NULL;
	char *service = NULL;
	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 (conn_num_open(sconn) > 2047) {
		*status = NT_STATUS_INSUFF_SERVER_RESOURCES;
		return NULL;
	}

	vuser = get_valid_user_struct(sconn, 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 (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_smb1(sconn, now,
					    vuser->homes_snum,
					    vuser,
					    dev, status);
	} else if ((vuser->homes_snum != -1)
		   && strequal(service_in,
			       lp_servicename(talloc_tos(), vuser->homes_snum))) {
		DEBUG(5, ("making a connection to 'homes' service [%s] "
			  "created at session setup time\n", service_in));
		return make_connection_smb1(sconn, now,
					    vuser->homes_snum,
					    vuser,
					    dev, status);
	}

	service = talloc_strdup(talloc_tos(), service_in);
	if (!service) {
		*status = NT_STATUS_NO_MEMORY;
		return NULL;
	}

	if (!strlower_m(service)) {
		DEBUG(2, ("strlower_m %s failed\n", service));
		*status = NT_STATUS_INVALID_PARAMETER;
		return NULL;
	}

	snum = find_service(talloc_tos(), service, &service);
	if (!service) {
		*status = NT_STATUS_NO_MEMORY;
		return NULL;
	}

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

		DEBUG(3,("%s (%s) couldn't find service %s\n",
			get_remote_machine_name(),
			tsocket_address_string(
				sconn->remote_address, talloc_tos()),
			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(talloc_tos(), snum) != '\0'))  {
		DEBUG(3, ("refusing connection to dfs proxy share '%s' "
			  "(pointing to %s)\n", 
			service, lp_msdfs_proxy(talloc_tos(), snum)));
		*status = NT_STATUS_BAD_NETWORK_NAME;
		return NULL;
	}

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

	return make_connection_smb1(sconn, now, snum, vuser,
				    dev, status);
}

/****************************************************************************
 Close a cnum.
****************************************************************************/

void close_cnum(connection_struct *conn, uint64_t vuid)
{
	file_close_conn(conn);

	if (!IS_IPC(conn)) {
		dptr_closecnum(conn);
	}

	change_to_root_user();

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

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

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

	/* execute any "postexec = " line */
	if (*lp_postexec(talloc_tos(), SNUM(conn)) &&
	    change_to_user(conn, vuid))  {
		char *cmd = talloc_sub_advanced(talloc_tos(),
					lp_servicename(talloc_tos(), SNUM(conn)),
					conn->session_info->unix_info->unix_name,
					conn->connectpath,
					conn->session_info->unix_token->gid,
					conn->session_info->unix_info->sanitized_username,
					conn->session_info->info->domain_name,
					lp_postexec(talloc_tos(), SNUM(conn)));
		smbrun(cmd,NULL);
		TALLOC_FREE(cmd);
		change_to_root_user();
	}

	change_to_root_user();
	/* execute any "root postexec = " line */
	if (*lp_rootpostexec(talloc_tos(), SNUM(conn)))  {
		char *cmd = talloc_sub_advanced(talloc_tos(),
					lp_servicename(talloc_tos(), SNUM(conn)),
					conn->session_info->unix_info->unix_name,
					conn->connectpath,
					conn->session_info->unix_token->gid,
					conn->session_info->unix_info->sanitized_username,
					conn->session_info->info->domain_name,
					lp_rootpostexec(talloc_tos(), SNUM(conn)));
		smbrun(cmd,NULL);
		TALLOC_FREE(cmd);
	}

	conn_free(conn);
}