summaryrefslogtreecommitdiff
path: root/source3/nsswitch/winbindd_ads.c
blob: f6fc3a8d6c9cf006ab2adba91e4d94351efd55d9 (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
/* 
   Unix SMB/CIFS implementation.

   Winbind ADS backend functions

   Copyright (C) Andrew Tridgell 2001
   
   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 "winbindd.h"

#ifdef HAVE_ADS

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

/* the realm of our primary LDAP server */
static char *primary_realm;


/*
  return our ads connections structure for a domain. We keep the connection
  open to make things faster
*/
static ADS_STRUCT *ads_cached_connection(struct winbindd_domain *domain)
{
	ADS_STRUCT *ads;
	ADS_STATUS status;

	if (domain->private) {
		return (ADS_STRUCT *)domain->private;
	}

	/* we don't want this to affect the users ccache */
	setenv("KRB5CCNAME", "MEMORY:winbind_ccache", 1);

	ads = ads_init(domain->alt_name, domain->name, NULL);
	if (!ads) {
		DEBUG(1,("ads_init for domain %s failed\n", domain->name));
		return NULL;
	}

	/* the machine acct password might have change - fetch it every time */
	SAFE_FREE(ads->auth.password);
	ads->auth.password = secrets_fetch_machine_password();

	if (primary_realm) {
		SAFE_FREE(ads->auth.realm);
		ads->auth.realm = strdup(primary_realm);
	}

	status = ads_connect(ads);
	if (!ADS_ERR_OK(status) || !ads->config.realm) {
		extern struct winbindd_methods msrpc_methods;
		DEBUG(1,("ads_connect for domain %s failed: %s\n", 
			 domain->name, ads_errstr(status)));
		ads_destroy(&ads);

		/* if we get ECONNREFUSED then it might be a NT4
                   server, fall back to MSRPC */
		if (status.error_type == ADS_ERROR_SYSTEM &&
		    status.err.rc == ECONNREFUSED) {
			DEBUG(1,("Trying MSRPC methods\n"));
			domain->methods = &msrpc_methods;
		}
		return NULL;
	}

	/* remember our primary realm for trusted domain support */
	if (!primary_realm) {
		primary_realm = strdup(ads->config.realm);
	}

	domain->private = (void *)ads;
	return ads;
}

/* useful utility */
static void sid_from_rid(struct winbindd_domain *domain, uint32 rid, DOM_SID *sid)
{
	sid_copy(sid, &domain->sid);
	sid_append_rid(sid, rid);
}


/* Query display info for a realm. This is the basic user list fn */
static NTSTATUS query_user_list(struct winbindd_domain *domain,
			       TALLOC_CTX *mem_ctx,
			       uint32 *num_entries, 
			       WINBIND_USERINFO **info)
{
	ADS_STRUCT *ads = NULL;
	const char *attrs[] = {"userPrincipalName",
			       "sAMAccountName",
			       "name", "objectSid", "primaryGroupID", 
			       "sAMAccountType", NULL};
	int i, count;
	ADS_STATUS rc;
	void *res = NULL;
	void *msg = NULL;
	NTSTATUS status = NT_STATUS_UNSUCCESSFUL;

	*num_entries = 0;

	DEBUG(3,("ads: query_user_list\n"));

	ads = ads_cached_connection(domain);
	if (!ads) goto done;

	rc = ads_search_retry(ads, &res, "(objectCategory=user)", attrs);
	if (!ADS_ERR_OK(rc)) {
		DEBUG(1,("query_user_list ads_search: %s\n", ads_errstr(rc)));
		goto done;
	}

	count = ads_count_replies(ads, res);
	if (count == 0) {
		DEBUG(1,("query_user_list: No users found\n"));
		goto done;
	}

	(*info) = talloc_zero(mem_ctx, count * sizeof(**info));
	if (!*info) {
		status = NT_STATUS_NO_MEMORY;
		goto done;
	}

	i = 0;

	for (msg = ads_first_entry(ads, res); msg; msg = ads_next_entry(ads, msg)) {
		char *name, *gecos;
		DOM_SID sid;
		uint32 rid, group;
		uint32 atype;

		if (!ads_pull_uint32(ads, msg, "sAMAccountType", &atype) ||
		    ads_atype_map(atype) != SID_NAME_USER) {
			DEBUG(1,("Not a user account? atype=0x%x\n", atype));
			continue;
		}

		name = ads_pull_username(ads, mem_ctx, msg);
		gecos = ads_pull_string(ads, mem_ctx, msg, "name");
		if (!ads_pull_sid(ads, msg, "objectSid", &sid)) {
			DEBUG(1,("No sid for %s !?\n", name));
			continue;
		}
		if (!ads_pull_uint32(ads, msg, "primaryGroupID", &group)) {
			DEBUG(1,("No primary group for %s !?\n", name));
			continue;
		}

		if (!sid_peek_check_rid(&domain->sid, &sid, &rid)) {
			DEBUG(1,("No rid for %s !?\n", name));
			continue;
		}

		(*info)[i].acct_name = name;
		(*info)[i].full_name = gecos;
		(*info)[i].user_rid = rid;
		(*info)[i].group_rid = group;
		i++;
	}

	(*num_entries) = i;
	status = NT_STATUS_OK;

	DEBUG(3,("ads query_user_list gave %d entries\n", (*num_entries)));

done:
	if (res) ads_msgfree(ads, res);

	return status;
}

/* list all domain groups */
static NTSTATUS enum_dom_groups(struct winbindd_domain *domain,
				TALLOC_CTX *mem_ctx,
				uint32 *num_entries, 
				struct acct_info **info)
{
	ADS_STRUCT *ads = NULL;
	const char *attrs[] = {"userPrincipalName", "sAMAccountName",
			       "name", "objectSid", 
			       "sAMAccountType", NULL};
	int i, count;
	ADS_STATUS rc;
	void *res = NULL;
	void *msg = NULL;
	NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
	uint32 group_flags;

	*num_entries = 0;

	DEBUG(3,("ads: enum_dom_groups\n"));

	ads = ads_cached_connection(domain);
	if (!ads) goto done;

	rc = ads_search_retry(ads, &res, "(objectCategory=group)", attrs);
	if (!ADS_ERR_OK(rc)) {
		DEBUG(1,("enum_dom_groups ads_search: %s\n", ads_errstr(rc)));
		goto done;
	}

	count = ads_count_replies(ads, res);
	if (count == 0) {
		DEBUG(1,("enum_dom_groups: No groups found\n"));
		goto done;
	}

	(*info) = talloc_zero(mem_ctx, count * sizeof(**info));
	if (!*info) {
		status = NT_STATUS_NO_MEMORY;
		goto done;
	}

	i = 0;
	
	group_flags = ATYPE_GLOBAL_GROUP;
	if ( domain->native_mode )
		group_flags |= ATYPE_LOCAL_GROUP;

	for (msg = ads_first_entry(ads, res); msg; msg = ads_next_entry(ads, msg)) {
		char *name, *gecos;
		DOM_SID sid;
		uint32 rid;
		uint32 account_type;

		if (!ads_pull_uint32(ads, msg, "sAMAccountType", &account_type) || !(account_type & group_flags) ) 
			continue; 
			
		name = ads_pull_username(ads, mem_ctx, msg);
		gecos = ads_pull_string(ads, mem_ctx, msg, "name");
		if (!ads_pull_sid(ads, msg, "objectSid", &sid)) {
			DEBUG(1,("No sid for %s !?\n", name));
			continue;
		}

		if (!sid_peek_check_rid(&domain->sid, &sid, &rid)) {
			DEBUG(1,("No rid for %s !?\n", name));
			continue;
		}

		fstrcpy((*info)[i].acct_name, name);
		fstrcpy((*info)[i].acct_desc, gecos);
		(*info)[i].rid = rid;
		i++;
	}

	(*num_entries) = i;

	status = NT_STATUS_OK;

	DEBUG(3,("ads enum_dom_groups gave %d entries\n", (*num_entries)));

done:
	if (res) ads_msgfree(ads, res);

	return status;
}

/* list all domain local groups */
static NTSTATUS enum_local_groups(struct winbindd_domain *domain,
				TALLOC_CTX *mem_ctx,
				uint32 *num_entries, 
				struct acct_info **info)
{
	/*
	 * This is a stub function only as we returned the domain 
	 * ocal groups in enum_dom_groups() if the domain->native field
	 * was true.  This is a simple performance optimization when
	 * using LDAP.
	 *
	 * if we ever need to enumerate domain local groups separately, 
	 * then this the optimization in enum_dom_groups() will need 
	 * to be split out
	 */
	*num_entries = 0;
	
	return NT_STATUS_OK;
}

/* convert a single name to a sid in a domain */
static NTSTATUS name_to_sid(struct winbindd_domain *domain,
			    const char *name,
			    DOM_SID *sid,
			    enum SID_NAME_USE *type)
{
	ADS_STRUCT *ads;

	DEBUG(3,("ads: name_to_sid\n"));

	ads = ads_cached_connection(domain);
	if (!ads) 
		return NT_STATUS_UNSUCCESSFUL;

	return ads_name_to_sid(ads, name, sid, type);
}

/* convert a sid to a user or group name */
static NTSTATUS sid_to_name(struct winbindd_domain *domain,
			    TALLOC_CTX *mem_ctx,
			    DOM_SID *sid,
			    char **name,
			    enum SID_NAME_USE *type)
{
	ADS_STRUCT *ads = NULL;
	DEBUG(3,("ads: sid_to_name\n"));
	ads = ads_cached_connection(domain);
	if (!ads) 
		return NT_STATUS_UNSUCCESSFUL;

	return ads_sid_to_name(ads, mem_ctx, sid, name, type);
}


/* convert a DN to a name, rid and name type 
   this might become a major speed bottleneck if groups have
   lots of users, in which case we could cache the results
*/
static BOOL dn_lookup(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
		      const char *dn,
		      char **name, uint32 *name_type, uint32 *rid)
{
	char *exp;
	void *res = NULL;
	const char *attrs[] = {"userPrincipalName", "sAMAccountName",
			       "objectSid", "sAMAccountType", NULL};
	ADS_STATUS rc;
	uint32 atype;
	DOM_SID sid;
	char *escaped_dn = escape_ldap_string_alloc(dn);

	if (!escaped_dn) {
		return False;
	}

	asprintf(&exp, "(distinguishedName=%s)", dn);
	rc = ads_search_retry(ads, &res, exp, attrs);
	SAFE_FREE(exp);
	SAFE_FREE(escaped_dn);

	if (!ADS_ERR_OK(rc)) {
		goto failed;
	}

	(*name) = ads_pull_username(ads, mem_ctx, res);

	if (!ads_pull_uint32(ads, res, "sAMAccountType", &atype)) {
		goto failed;
	}
	(*name_type) = ads_atype_map(atype);

	if (!ads_pull_sid(ads, res, "objectSid", &sid) || 
	    !sid_peek_rid(&sid, rid)) {
		goto failed;
	}

	if (res) ads_msgfree(ads, res);
	return True;

failed:
	if (res) ads_msgfree(ads, res);
	return False;
}

/* Lookup user information from a rid */
static NTSTATUS query_user(struct winbindd_domain *domain, 
			   TALLOC_CTX *mem_ctx, 
			   uint32 user_rid, 
			   WINBIND_USERINFO *info)
{
	ADS_STRUCT *ads = NULL;
	const char *attrs[] = {"userPrincipalName", 
			       "sAMAccountName",
			       "name", "objectSid", 
			       "primaryGroupID", NULL};
	ADS_STATUS rc;
	int count;
	void *msg = NULL;
	char *exp;
	DOM_SID sid;
	char *sidstr;
	NTSTATUS status = NT_STATUS_UNSUCCESSFUL;

	DEBUG(3,("ads: query_user\n"));

	sid_from_rid(domain, user_rid, &sid);

	ads = ads_cached_connection(domain);
	if (!ads) goto done;

	sidstr = sid_binstring(&sid);
	asprintf(&exp, "(objectSid=%s)", sidstr);
	rc = ads_search_retry(ads, &msg, exp, attrs);
	free(exp);
	free(sidstr);
	if (!ADS_ERR_OK(rc)) {
		DEBUG(1,("query_user(rid=%d) ads_search: %s\n", user_rid, ads_errstr(rc)));
		goto done;
	}

	count = ads_count_replies(ads, msg);
	if (count != 1) {
		DEBUG(1,("query_user(rid=%d): Not found\n", user_rid));
		goto done;
	}

	info->acct_name = ads_pull_username(ads, mem_ctx, msg);
	info->full_name = ads_pull_string(ads, mem_ctx, msg, "name");
	if (!ads_pull_sid(ads, msg, "objectSid", &sid)) {
		DEBUG(1,("No sid for %d !?\n", user_rid));
		goto done;
	}
	if (!ads_pull_uint32(ads, msg, "primaryGroupID", &info->group_rid)) {
		DEBUG(1,("No primary group for %d !?\n", user_rid));
		goto done;
	}
	
	if (!sid_peek_check_rid(&domain->sid,&sid, &info->user_rid)) {
		DEBUG(1,("No rid for %d !?\n", user_rid));
		goto done;
	}

	status = NT_STATUS_OK;

	DEBUG(3,("ads query_user gave %s\n", info->acct_name));
done:
	if (msg) ads_msgfree(ads, msg);

	return status;
}


/* Lookup groups a user is a member of. */
static NTSTATUS lookup_usergroups(struct winbindd_domain *domain,
				  TALLOC_CTX *mem_ctx,
				  uint32 user_rid, 
				  uint32 *num_groups, uint32 **user_gids)
{
	ADS_STRUCT *ads = NULL;
	const char *attrs[] = {"distinguishedName", NULL};
	const char *attrs2[] = {"tokenGroups", "primaryGroupID", NULL};
	ADS_STATUS rc;
	int count;
	void *msg = NULL;
	char *exp;
	char *user_dn;
	DOM_SID *sids;
	int i;
	uint32 primary_group;
	DOM_SID sid;
	char *sidstr;
	NTSTATUS status = NT_STATUS_UNSUCCESSFUL;

	*num_groups = 0;

	DEBUG(3,("ads: lookup_usergroups\n"));

	(*num_groups) = 0;

	sid_from_rid(domain, user_rid, &sid);

	ads = ads_cached_connection(domain);
	if (!ads) goto done;

	sidstr = sid_binstring(&sid);
	asprintf(&exp, "(objectSid=%s)", sidstr);
	rc = ads_search_retry(ads, &msg, exp, attrs);
	free(exp);
	free(sidstr);
	if (!ADS_ERR_OK(rc)) {
		DEBUG(1,("lookup_usergroups(rid=%d) ads_search: %s\n", user_rid, ads_errstr(rc)));
		goto done;
	}

	user_dn = ads_pull_string(ads, mem_ctx, msg, "distinguishedName");

	if (msg) ads_msgfree(ads, msg);

	rc = ads_search_retry_dn(ads, &msg, user_dn, attrs2);
	if (!ADS_ERR_OK(rc)) {
		DEBUG(1,("lookup_usergroups(rid=%d) ads_search tokenGroups: %s\n", user_rid, ads_errstr(rc)));
		goto done;
	}

	if (!ads_pull_uint32(ads, msg, "primaryGroupID", &primary_group)) {
		DEBUG(1,("%s: No primary group for rid=%d !?\n", domain->name, user_rid));
		goto done;
	}

	count = ads_pull_sids(ads, mem_ctx, msg, "tokenGroups", &sids) + 1;
	(*user_gids) = (uint32 *)talloc_zero(mem_ctx, sizeof(uint32) * count);
	(*user_gids)[(*num_groups)++] = primary_group;

	for (i=1;i<count;i++) {
		uint32 rid;
		if (!sid_peek_check_rid(&domain->sid, &sids[i-1], &rid)) continue;
		(*user_gids)[*num_groups] = rid;
		(*num_groups)++;
	}

	status = NT_STATUS_OK;
	DEBUG(3,("ads lookup_usergroups for rid=%d\n", user_rid));
done:
	if (msg) ads_msgfree(ads, msg);

	return status;
}

/*
  find the members of a group, given a group rid and domain
 */
static NTSTATUS lookup_groupmem(struct winbindd_domain *domain,
				TALLOC_CTX *mem_ctx,
				uint32 group_rid, uint32 *num_names, 
				uint32 **rid_mem, char ***names, 
				uint32 **name_types)
{
	DOM_SID group_sid;
	ADS_STATUS rc;
	int count;
	void *res=NULL;
	ADS_STRUCT *ads = NULL;
	char *exp;
	NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
	char *sidstr;
	const char *attrs[] = {"member", NULL};
	char **members;
	int i, num_members;

	*num_names = 0;

	ads = ads_cached_connection(domain);
	if (!ads) goto done;

	sid_from_rid(domain, group_rid, &group_sid);
	sidstr = sid_binstring(&group_sid);

	/* search for all members of the group */
	asprintf(&exp, "(objectSid=%s)",sidstr);
	rc = ads_search_retry(ads, &res, exp, attrs);
	free(exp);
	free(sidstr);

	if (!ADS_ERR_OK(rc)) {
		DEBUG(1,("query_user_list ads_search: %s\n", ads_errstr(rc)));
		goto done;
	}

	count = ads_count_replies(ads, res);
	if (count == 0) {
		status = NT_STATUS_OK;
		goto done;
	}

	members = ads_pull_strings(ads, mem_ctx, res, "member");
	if (!members) {
		/* no members? ok ... */
		status = NT_STATUS_OK;
		goto done;
	}

	/* now we need to turn a list of members into rids, names and name types 
	   the problem is that the members are in the form of distinguised names
	*/
	for (i=0;members[i];i++) /* noop */ ;
	num_members = i;

	(*rid_mem) = talloc_zero(mem_ctx, sizeof(uint32) * num_members);
	(*name_types) = talloc_zero(mem_ctx, sizeof(uint32) * num_members);
	(*names) = talloc_zero(mem_ctx, sizeof(char *) * num_members);

	for (i=0;i<num_members;i++) {
		uint32 name_type, rid;
		char *name;

		if (dn_lookup(ads, mem_ctx, members[i], &name, &name_type, &rid)) {
		    (*names)[*num_names] = name;
		    (*name_types)[*num_names] = name_type;
		    (*rid_mem)[*num_names] = rid;
		    (*num_names)++;
		}
	}	

	status = NT_STATUS_OK;
	DEBUG(3,("ads lookup_groupmem for rid=%d\n", group_rid));
done:
	if (res) ads_msgfree(ads, res);

	return status;
}


/* find the sequence number for a domain */
static NTSTATUS sequence_number(struct winbindd_domain *domain, uint32 *seq)
{
	ADS_STRUCT *ads = NULL;
	ADS_STATUS rc;

	*seq = DOM_SEQUENCE_NONE;

	ads = ads_cached_connection(domain);
	if (!ads) return NT_STATUS_UNSUCCESSFUL;

	rc = ads_USN(ads, seq);
	if (!ADS_ERR_OK(rc)) {
		/* its a dead connection */
		ads_destroy(&ads);
		domain->private = NULL;
	}
	return ads_ntstatus(rc);
}

/* get a list of trusted domains */
static NTSTATUS trusted_domains(struct winbindd_domain *domain,
				TALLOC_CTX *mem_ctx,
				uint32 *num_domains,
				char ***names,
				char ***alt_names,
				DOM_SID **dom_sids)
{
	ADS_STRUCT *ads;
	ADS_STATUS rc;

	*num_domains = 0;
	*names = NULL;

	ads = ads_cached_connection(domain);
	if (!ads) return NT_STATUS_UNSUCCESSFUL;

	rc = ads_trusted_domains(ads, mem_ctx, num_domains, names, alt_names, dom_sids);

	return ads_ntstatus(rc);
}

/* find the domain sid for a domain */
static NTSTATUS domain_sid(struct winbindd_domain *domain, DOM_SID *sid)
{
	ADS_STRUCT *ads;
	ADS_STATUS rc;

	ads = ads_cached_connection(domain);
	if (!ads) return NT_STATUS_UNSUCCESSFUL;

	rc = ads_domain_sid(ads, sid);

	if (!ADS_ERR_OK(rc)) {
		/* its a dead connection */
		ads_destroy(&ads);
		domain->private = NULL;
	}

	return ads_ntstatus(rc);
}


/* find alternate names list for the domain - for ADS this is the
   netbios name */
static NTSTATUS alternate_name(struct winbindd_domain *domain)
{
	ADS_STRUCT *ads;
	ADS_STATUS rc;
	TALLOC_CTX *ctx;
	char *workgroup;

	ads = ads_cached_connection(domain);
	if (!ads) return NT_STATUS_UNSUCCESSFUL;

	if (!(ctx = talloc_init("alternate_name"))) {
		return NT_STATUS_NO_MEMORY;
	}

	rc = ads_workgroup_name(ads, ctx, &workgroup);

	if (ADS_ERR_OK(rc)) {
		fstrcpy(domain->name, workgroup);
		fstrcpy(domain->alt_name, ads->config.realm);
		strupper(domain->alt_name);
		strupper(domain->name);
	}

	talloc_destroy(ctx);

	return ads_ntstatus(rc);	
}

/* the ADS backend methods are exposed via this structure */
struct winbindd_methods ads_methods = {
	True,
	query_user_list,
	enum_dom_groups,
	enum_local_groups,
	name_to_sid,
	sid_to_name,
	query_user,
	lookup_usergroups,
	lookup_groupmem,
	sequence_number,
	trusted_domains,
	domain_sid,
	alternate_name
};

#endif