summaryrefslogtreecommitdiff
path: root/libgpo/gpext/gpext.c
blob: 6177bdc71049cd0f8e59413423ef52d29beb72e7 (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
/*
 *  Unix SMB/CIFS implementation.
 *  Group Policy Support
 *  Copyright (C) Guenther Deschner 2007-2008
 *
 *  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 "../libgpo/gpo.h"
#include "../libgpo/gpext/gpext.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "lib/util/dlinklist.h"
#include "../libcli/registry/util_reg.h"
#include "libgpo/gpo_proto.h"
#include "registry.h"
#include "registry/reg_api.h"

static struct gp_extension *extensions = NULL;

/****************************************************************
****************************************************************/

struct gp_extension *get_gp_extension_list(void)
{
	return extensions;
}

/****************************************************************
****************************************************************/

/* see http://support.microsoft.com/kb/216358/en-us/ for more info */

struct gp_extension_reg_table gpext_reg_vals[] = {
	{ "DllName", REG_EXPAND_SZ },
	{ "ProcessGroupPolicy", REG_SZ },
	{ "NoMachinePolicy", REG_DWORD },
	{ "NoUserPolicy", REG_DWORD },
	{ "NoSlowLink", REG_DWORD },
	{ "NoBackgroundPolicy", REG_DWORD },
	{ "NoGPOListChanges", REG_DWORD },
	{ "PerUserLocalSettings", REG_DWORD },
	{ "RequiresSuccessfulRegistry", REG_DWORD },
	{ "EnableAsynchronousProcessing", REG_DWORD },
	{ "ExtensionDebugLevel", REG_DWORD },
	/* new */
	{ "GenerateGroupPolicy", REG_SZ }, /* not supported on w2k */
	{ "NotifyLinkTransition", REG_DWORD },
	{ "ProcessGroupPolicyEx", REG_SZ }, /* not supported on w2k */
	{ "ExtensionEventSource", REG_MULTI_SZ }, /* not supported on w2k */
	{ "GenerateGroupPolicy", REG_SZ },
	{ "MaxNoGPOListChangesInterval", REG_DWORD },
	{ NULL, REG_NONE }
};

/****************************************************************
****************************************************************/

static struct gp_extension *get_extension_by_name(struct gp_extension *be,
						  const char *name)
{
	struct gp_extension *b;

	for (b = be; b; b = b->next) {
		if (strequal(b->name, name)) {
			return b;
		}
	}

	return NULL;
}

/****************************************************************
****************************************************************/

static struct gp_extension_methods *get_methods_by_name(struct gp_extension *be,
							const char *name)
{
	struct gp_extension *b;

	for (b = be; b; b = b->next) {
		if (strequal(b->name, name)) {
			return b->methods;
		}
	}

	return NULL;
}

/****************************************************************
****************************************************************/

NTSTATUS unregister_gp_extension(const char *name)
{
	struct gp_extension *ext;

	ext = get_extension_by_name(extensions, name);
	if (!ext) {
		return NT_STATUS_OK;
	}

	DLIST_REMOVE(extensions, ext);
	talloc_free(ext);

	DEBUG(2,("Successfully removed GP extension '%s'\n", name));

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

NTSTATUS register_gp_extension(TALLOC_CTX *gpext_ctx,
			       int version,
			       const char *name,
			       const char *guid,
			       struct gp_extension_methods *methods)
{
	struct gp_extension_methods *test;
	struct gp_extension *entry;
	NTSTATUS status;

	if (!gpext_ctx) {
		return NT_STATUS_INTERNAL_DB_ERROR;
	}

	if ((version != SMB_GPEXT_INTERFACE_VERSION)) {
		DEBUG(0,("Failed to register gp extension.\n"
		         "The module was compiled against "
			 "SMB_GPEXT_INTERFACE_VERSION %d,\n"
		         "current SMB_GPEXT_INTERFACE_VERSION is %d.\n"
		         "Please recompile against the current "
			 "version of samba!\n",
			 version, SMB_GPEXT_INTERFACE_VERSION));
		return NT_STATUS_OBJECT_TYPE_MISMATCH;
	}

	if (!guid || !name || !name[0] || !methods) {
		DEBUG(0,("Called with NULL pointer or empty name!\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	test = get_methods_by_name(extensions, name);
	if (test) {
		DEBUG(0,("GP extension module %s already registered!\n",
			name));
		return NT_STATUS_OBJECT_NAME_COLLISION;
	}

	entry = talloc_zero(gpext_ctx, struct gp_extension);
	NT_STATUS_HAVE_NO_MEMORY(entry);

	entry->name = talloc_strdup(gpext_ctx, name);
	NT_STATUS_HAVE_NO_MEMORY(entry->name);

	entry->guid = talloc_zero(gpext_ctx, struct GUID);
	NT_STATUS_HAVE_NO_MEMORY(entry->guid);
	status = GUID_from_string(guid, entry->guid);
	NT_STATUS_NOT_OK_RETURN(status);

	entry->methods = methods;
	DLIST_ADD(extensions, entry);

	DEBUG(2,("Successfully added GP extension '%s' %s\n",
		name, GUID_string2(gpext_ctx, entry->guid)));

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

static NTSTATUS gp_extension_init_module(TALLOC_CTX *mem_ctx,
					 const char *name,
					 struct gp_extension **gpext)
{
	NTSTATUS status;
	struct gp_extension *ext = NULL;

	ext = talloc_zero(mem_ctx, struct gp_extension);
	NT_STATUS_HAVE_NO_MEMORY(gpext);

	ext->methods = get_methods_by_name(extensions, name);
	if (!ext->methods) {

		status = smb_probe_module(SAMBA_SUBSYSTEM_GPEXT,
					  name);
		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		ext->methods = get_methods_by_name(extensions, name);
		if (!ext->methods) {
			return NT_STATUS_DLL_INIT_FAILED;
		}
	}

	*gpext = ext;

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

static bool add_gp_extension_reg_entry_to_array(TALLOC_CTX *mem_ctx,
						struct gp_extension_reg_entry *entry,
						struct gp_extension_reg_entry **entries,
						size_t *num)
{
	*entries = talloc_realloc(mem_ctx, *entries,
					struct gp_extension_reg_entry,
					(*num)+1);
	if (*entries == NULL) {
		*num = 0;
		return false;
	}

	(*entries)[*num].value = entry->value;
	(*entries)[*num].data = entry->data;

	*num += 1;
	return true;
}

/****************************************************************
****************************************************************/

static bool add_gp_extension_reg_info_entry_to_array(TALLOC_CTX *mem_ctx,
						     struct gp_extension_reg_info_entry *entry,
						     struct gp_extension_reg_info_entry **entries,
						     size_t *num)
{
	*entries = talloc_realloc(mem_ctx, *entries,
					struct gp_extension_reg_info_entry,
					(*num)+1);
	if (*entries == NULL) {
		*num = 0;
		return false;
	}

	(*entries)[*num].guid = entry->guid;
	(*entries)[*num].num_entries = entry->num_entries;
	(*entries)[*num].entries = entry->entries;

	*num += 1;
	return true;
}

/****************************************************************
****************************************************************/

static NTSTATUS gp_ext_info_add_reg(TALLOC_CTX *mem_ctx,
				    struct gp_extension_reg_info_entry *entry,
				    const char *value,
				    enum winreg_Type type,
				    const char *data_s)
{
	struct gp_extension_reg_entry *reg_entry = NULL;
	struct registry_value *data = NULL;

	reg_entry = talloc_zero(mem_ctx, struct gp_extension_reg_entry);
	NT_STATUS_HAVE_NO_MEMORY(reg_entry);

	data = talloc_zero(mem_ctx, struct registry_value);
	NT_STATUS_HAVE_NO_MEMORY(data);

	data->type = type;

	switch (type) {
		case REG_SZ:
		case REG_EXPAND_SZ:
			if (!push_reg_sz(mem_ctx, &data->data, data_s)) {
				return NT_STATUS_NO_MEMORY;
			}
			break;
		case REG_DWORD: {
			uint32_t v = atoi(data_s);
			data->data = data_blob_talloc(mem_ctx, NULL, 4);
			SIVAL(data->data.data, 0, v);
			break;
		}
		default:
			return NT_STATUS_NOT_SUPPORTED;
	}

	reg_entry->value = value;
	reg_entry->data = data;

	if (!add_gp_extension_reg_entry_to_array(mem_ctx, reg_entry,
						 &entry->entries,
						 &entry->num_entries)) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

static NTSTATUS gp_ext_info_add_reg_table(TALLOC_CTX *mem_ctx,
					  const char *module,
					  struct gp_extension_reg_info_entry *entry,
					  struct gp_extension_reg_table *table)
{
	NTSTATUS status;
	const char *module_name = NULL;
	int i;

	module_name = talloc_asprintf(mem_ctx, "%s.%s", module, shlib_ext());
	NT_STATUS_HAVE_NO_MEMORY(module_name);

	status = gp_ext_info_add_reg(mem_ctx, entry,
				     "DllName", REG_EXPAND_SZ, module_name);
	NT_STATUS_NOT_OK_RETURN(status);

	for (i=0; table[i].val; i++) {
		status = gp_ext_info_add_reg(mem_ctx, entry,
					     table[i].val,
					     table[i].type,
					     table[i].data);
		NT_STATUS_NOT_OK_RETURN(status);
	}

	return status;
}

/****************************************************************
****************************************************************/

NTSTATUS gp_ext_info_add_entry(TALLOC_CTX *mem_ctx,
			       const char *module,
			       const char *ext_guid,
			       struct gp_extension_reg_table *table,
			       struct gp_extension_reg_info *info)
{
	NTSTATUS status;
	struct gp_extension_reg_info_entry *entry = NULL;

	entry = talloc_zero(mem_ctx, struct gp_extension_reg_info_entry);
	NT_STATUS_HAVE_NO_MEMORY(entry);

	status = GUID_from_string(ext_guid, &entry->guid);
	NT_STATUS_NOT_OK_RETURN(status);

	status = gp_ext_info_add_reg_table(mem_ctx, module, entry, table);
	NT_STATUS_NOT_OK_RETURN(status);

	if (!add_gp_extension_reg_info_entry_to_array(mem_ctx, entry,
						      &info->entries,
						      &info->num_entries)) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

static bool gp_extension_reg_info_verify_entry(struct gp_extension_reg_entry *entry)
{
	int i;

	for (i=0; gpext_reg_vals[i].val; i++) {

		if ((strequal(entry->value, gpext_reg_vals[i].val)) &&
		    (entry->data->type == gpext_reg_vals[i].type)) {
			return true;
		}
	}

	return false;
}

/****************************************************************
****************************************************************/

static bool gp_extension_reg_info_verify(struct gp_extension_reg_info_entry *entry)
{
	int i;

	for (i=0; i < entry->num_entries; i++) {
		if (!gp_extension_reg_info_verify_entry(&entry->entries[i])) {
			return false;
		}
	}

	return true;
}

/****************************************************************
****************************************************************/

static WERROR gp_extension_store_reg_vals(TALLOC_CTX *mem_ctx,
					  struct registry_key *key,
					  struct gp_extension_reg_info_entry *entry)
{
	WERROR werr = WERR_OK;
	size_t i;

	for (i=0; i < entry->num_entries; i++) {

		werr = reg_setvalue(key,
				    entry->entries[i].value,
				    entry->entries[i].data);
		W_ERROR_NOT_OK_RETURN(werr);
	}

	return werr;
}

/****************************************************************
****************************************************************/

static WERROR gp_extension_store_reg_entry(TALLOC_CTX *mem_ctx,
					   struct gp_registry_context *reg_ctx,
					   struct gp_extension_reg_info_entry *entry)
{
	WERROR werr;
	struct registry_key *key = NULL;
	const char *subkeyname = NULL;

	if (!gp_extension_reg_info_verify(entry)) {
		return WERR_INVALID_PARAM;
	}

	subkeyname = GUID_string2(mem_ctx, &entry->guid);
	W_ERROR_HAVE_NO_MEMORY(subkeyname);

	strupper_m(discard_const_p(char, subkeyname));

	werr = gp_store_reg_subkey(mem_ctx,
				   subkeyname,
				   reg_ctx->curr_key,
				   &key);
	W_ERROR_NOT_OK_RETURN(werr);

	werr = gp_extension_store_reg_vals(mem_ctx,
					   key,
					   entry);
	W_ERROR_NOT_OK_RETURN(werr);

	return werr;
}

/****************************************************************
****************************************************************/

static WERROR gp_extension_store_reg(TALLOC_CTX *mem_ctx,
				     struct gp_registry_context *reg_ctx,
				     struct gp_extension_reg_info *info)
{
	WERROR werr = WERR_OK;
	int i;

	if (!info) {
		return WERR_OK;
	}

	for (i=0; i < info->num_entries; i++) {
		werr = gp_extension_store_reg_entry(mem_ctx,
						    reg_ctx,
						    &info->entries[i]);
		W_ERROR_NOT_OK_RETURN(werr);
	}

	return werr;
}

/****************************************************************
****************************************************************/

static NTSTATUS gp_glob_ext_list(TALLOC_CTX *mem_ctx,
				 const char ***ext_list,
				 size_t *ext_list_len)
{
	SMB_STRUCT_DIR *dir = NULL;
	SMB_STRUCT_DIRENT *dirent = NULL;

	dir = opendir(modules_path(talloc_tos(), 
				       SAMBA_SUBSYSTEM_GPEXT));
	if (!dir) {
		return map_nt_error_from_unix_common(errno);
	}

	while ((dirent = readdir(dir))) {

		fstring name; /* forgive me... */
		char *p;

		if ((strequal(dirent->d_name, ".")) ||
		    (strequal(dirent->d_name, ".."))) {
			continue;
		}

		p = strrchr(dirent->d_name, '.');
		if (!p) {
			sys_closedir(dir);
			return NT_STATUS_NO_MEMORY;
		}

		if (!strcsequal(p+1, shlib_ext())) {
			DEBUG(10,("gp_glob_ext_list: not a *.so file: %s\n",
				dirent->d_name));
			continue;
		}

		fstrcpy(name, dirent->d_name);
		name[PTR_DIFF(p, dirent->d_name)] = 0;

		if (!add_string_to_array(mem_ctx, name, ext_list,
					 (int *)ext_list_len)) {
			sys_closedir(dir);
			return NT_STATUS_NO_MEMORY;
		}
	}

	sys_closedir(dir);

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

NTSTATUS shutdown_gp_extensions(void)
{
	struct gp_extension *ext = NULL;

	for (ext = extensions; ext; ext = ext->next) {
		if (ext->methods && ext->methods->shutdown) {
			ext->methods->shutdown();
		}
	}

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

NTSTATUS init_gp_extensions(TALLOC_CTX *mem_ctx)
{
	NTSTATUS status;
	WERROR werr;
	int i = 0;
	const char **ext_array = NULL;
	size_t ext_array_len = 0;
	struct gp_extension *gpext = NULL;
	struct gp_registry_context *reg_ctx = NULL;

	if (get_gp_extension_list()) {
		return NT_STATUS_OK;
	}

	status = gp_glob_ext_list(mem_ctx, &ext_array, &ext_array_len);
	NT_STATUS_NOT_OK_RETURN(status);

	for (i=0; i<ext_array_len; i++) {

		struct gp_extension_reg_info *info = NULL;

		status = gp_extension_init_module(mem_ctx, ext_array[i],
						  &gpext);
		if (!NT_STATUS_IS_OK(status)) {
			goto out;
		}

		if (gpext->methods->get_reg_config) {

			status = gpext->methods->initialize(mem_ctx);
			if (!NT_STATUS_IS_OK(status)) {
				gpext->methods->shutdown();
				goto out;
			}

			status = gpext->methods->get_reg_config(mem_ctx,
								&info);
			if (!NT_STATUS_IS_OK(status)) {
				gpext->methods->shutdown();
				goto out;
			}

			if (!reg_ctx) {
				struct security_token *token;

				token = registry_create_system_token(mem_ctx);
				NT_STATUS_HAVE_NO_MEMORY(token);

				werr = gp_init_reg_ctx(mem_ctx,
						       KEY_WINLOGON_GPEXT_PATH,
						       REG_KEY_WRITE,
						       token,
						       &reg_ctx);
				if (!W_ERROR_IS_OK(werr)) {
					status = werror_to_ntstatus(werr);
					gpext->methods->shutdown();
					goto out;
				}
			}

			werr = gp_extension_store_reg(mem_ctx, reg_ctx, info);
			if (!W_ERROR_IS_OK(werr)) {
				DEBUG(1,("gp_extension_store_reg failed: %s\n",
					win_errstr(werr)));
				TALLOC_FREE(info);
				gpext->methods->shutdown();
				status = werror_to_ntstatus(werr);
				goto out;
			}
			TALLOC_FREE(info);
		}

	}

 out:
	TALLOC_FREE(reg_ctx);

	return status;
}

/****************************************************************
****************************************************************/

NTSTATUS free_gp_extensions(void)
{
	struct gp_extension *ext, *ext_next = NULL;

	for (ext = extensions; ext; ext = ext_next) {
		ext_next = ext->next;
		DLIST_REMOVE(extensions, ext);
		TALLOC_FREE(ext);
	}

	extensions = NULL;

	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

void debug_gpext_header(int lvl,
			const char *name,
			uint32_t flags,
			struct GROUP_POLICY_OBJECT *gpo,
			const char *extension_guid,
			const char *snapin_guid)
{
	char *flags_str = NULL;

	DEBUG(lvl,("%s\n", name));
	DEBUGADD(lvl,("\tgpo:           %s (%s)\n", gpo->name,
		gpo->display_name));
	DEBUGADD(lvl,("\tcse extension: %s (%s)\n", extension_guid,
		cse_gpo_guid_string_to_name(extension_guid)));
	DEBUGADD(lvl,("\tgplink:        %s\n", gpo->link));
	DEBUGADD(lvl,("\tsnapin:        %s (%s)\n", snapin_guid,
		cse_snapin_gpo_guid_string_to_name(snapin_guid)));

	flags_str = gpo_flag_str(NULL, flags);
	DEBUGADD(lvl,("\tflags:         0x%08x %s\n", flags, flags_str));
	TALLOC_FREE(flags_str);
}

NTSTATUS process_gpo_list_with_extension(ADS_STRUCT *ads,
			   TALLOC_CTX *mem_ctx,
			   uint32_t flags,
			   const struct security_token *token,
			   struct GROUP_POLICY_OBJECT *gpo_list,
			   const char *extension_guid,
			   const char *snapin_guid)
{
	return NT_STATUS_OK;
}

/****************************************************************
****************************************************************/

NTSTATUS gpext_process_extension(ADS_STRUCT *ads,
				 TALLOC_CTX *mem_ctx,
				 uint32_t flags,
				 const struct security_token *token,
				 struct registry_key *root_key,
				 struct GROUP_POLICY_OBJECT *gpo,
				 const char *extension_guid,
				 const char *snapin_guid)
{
	NTSTATUS status;
	struct gp_extension *ext = NULL;
	struct GUID guid;
	bool cse_found = false;

	status = init_gp_extensions(mem_ctx);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1,("init_gp_extensions failed: %s\n",
			nt_errstr(status)));
		return status;
	}

	status = GUID_from_string(extension_guid, &guid);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	for (ext = extensions; ext; ext = ext->next) {

		if (GUID_equal(ext->guid, &guid)) {
			cse_found = true;
			break;
		}
	}

	if (!cse_found) {
		goto no_ext;
	}

	status = ext->methods->initialize(mem_ctx);
	NT_STATUS_NOT_OK_RETURN(status);

	status = ext->methods->process_group_policy(ads,
						    mem_ctx,
						    flags,
						    root_key,
						    token,
						    gpo,
						    extension_guid,
						    snapin_guid);
	if (!NT_STATUS_IS_OK(status)) {
		ext->methods->shutdown();
	}

	return status;

 no_ext:
	if (flags & GPO_INFO_FLAG_VERBOSE) {
		DEBUG(0,("process_extension: no extension available for:\n"));
		DEBUGADD(0,("%s (%s) (snapin: %s)\n",
			extension_guid,
			cse_gpo_guid_string_to_name(extension_guid),
			snapin_guid));
	}

	return NT_STATUS_OK;
}