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source: vendor/3.5.0/source3/smbd/posix_acls.c

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Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago
Samba 3.5.0: Initial import
File size: 136.1 KB

Line
1	/*
2	Unix SMB/CIFS implementation.
3	SMB NT Security Descriptor / Unix permission conversion.
4	Copyright (C) Jeremy Allison 1994-2009.
5	Copyright (C) Andreas Gruenbacher 2002.
6	Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8	This program is free software; you can redistribute it and/or modify
9	it under the terms of the GNU General Public License as published by
10	the Free Software Foundation; either version 3 of the License, or
11	(at your option) any later version.
12
13	This program is distributed in the hope that it will be useful,
14	but WITHOUT ANY WARRANTY; without even the implied warranty of
15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	GNU General Public License for more details.
17
18	You should have received a copy of the GNU General Public License
19	along with this program. If not, see <http://www.gnu.org/licenses/>.
20	*/
21
22	#include "includes.h"
23
24	extern struct current_user current_user;
25	extern const struct generic_mapping file_generic_mapping;
26
27	#undef DBGC_CLASS
28	#define DBGC_CLASS DBGC_ACLS
29
30	/****************************************************************************
31	Data structures representing the internal ACE format.
32	****************************************************************************/
33
34	enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35	enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37	typedef union posix_id {
38	uid_t uid;
39	gid_t gid;
40	int world;
41	} posix_id;
42
43	typedef struct canon_ace {
44	struct canon_ace next, prev;
45	SMB_ACL_TAG_T type;
46	mode_t perms; /* Only use S_I(R\|W\|X)USR mode bits here. */
47	DOM_SID trustee;
48	enum ace_owner owner_type;
49	enum ace_attribute attr;
50	posix_id unix_ug;
51	uint8_t ace_flags; /* From windows ACE entry. */
52	} canon_ace;
53
54	#define ALL_ACE_PERMS (S_IRUSR\|S_IWUSR\|S_IXUSR)
55
56	/*
57	* EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58	* attribute on disk - version 1.
59	* All values are little endian.
60	*
61	* \| 1 \| 1 \| 2 \| 2 \| ....
62	* +------+------+-------------+---------------------+-------------+--------------------+
63	* \| vers \| flag \| num_entries \| num_default_entries \| ..entries.. \| default_entries... \|
64	* +------+------+-------------+---------------------+-------------+--------------------+
65	*
66	* Entry format is :
67	*
68	* \| 1 \| 4 \|
69	* +------+-------------------+
70	* \| value\| uid/gid or world \|
71	* \| type \| value \|
72	* +------+-------------------+
73	*
74	* Version 2 format. Stores extra Windows metadata about an ACL.
75	*
76	* \| 1 \| 2 \| 2 \| 2 \| ....
77	* +------+----------+-------------+---------------------+-------------+--------------------+
78	* \| vers \| ace \| num_entries \| num_default_entries \| ..entries.. \| default_entries... \|
79	* \| 2 \| type \| \| \| \| \|
80	* +------+----------+-------------+---------------------+-------------+--------------------+
81	*
82	* Entry format is :
83	*
84	* \| 1 \| 1 \| 4 \|
85	* +------+------+-------------------+
86	* \| ace \| value\| uid/gid or world \|
87	* \| flag \| type \| value \|
88	* +------+-------------------+------+
89	*
90	*/
91
92	#define PAI_VERSION_OFFSET 0
93
94	#define PAI_V1_FLAG_OFFSET 1
95	#define PAI_V1_NUM_ENTRIES_OFFSET 2
96	#define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
97	#define PAI_V1_ENTRIES_BASE 6
98	#define PAI_V1_ACL_FLAG_PROTECTED 0x1
99	#define PAI_V1_ENTRY_LENGTH 5
100
101	#define PAI_V1_VERSION 1
102
103	#define PAI_V2_TYPE_OFFSET 1
104	#define PAI_V2_NUM_ENTRIES_OFFSET 3
105	#define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
106	#define PAI_V2_ENTRIES_BASE 7
107	#define PAI_V2_ENTRY_LENGTH 6
108
109	#define PAI_V2_VERSION 2
110
111	/*
112	* In memory format of user.SAMBA_PAI attribute.
113	*/
114
115	struct pai_entry {
116	struct pai_entry next, prev;
117	uint8_t ace_flags;
118	enum ace_owner owner_type;
119	posix_id unix_ug;
120	};
121
122	struct pai_val {
123	uint16_t sd_type;
124	unsigned int num_entries;
125	struct pai_entry *entry_list;
126	unsigned int num_def_entries;
127	struct pai_entry *def_entry_list;
128	};
129
130	/************************************************************************
131	Return a uint32 of the pai_entry principal.
132	************************************************************************/
133
134	static uint32_t get_pai_entry_val(struct pai_entry *paie)
135	{
136	switch (paie->owner_type) {
137	case UID_ACE:
138	DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
139	return (uint32_t)paie->unix_ug.uid;
140	case GID_ACE:
141	DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
142	return (uint32_t)paie->unix_ug.gid;
143	case WORLD_ACE:
144	default:
145	DEBUG(10,("get_pai_entry_val: world ace\n"));
146	return (uint32_t)-1;
147	}
148	}
149
150	/************************************************************************
151	Return a uint32 of the entry principal.
152	************************************************************************/
153
154	static uint32_t get_entry_val(canon_ace *ace_entry)
155	{
156	switch (ace_entry->owner_type) {
157	case UID_ACE:
158	DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
159	return (uint32_t)ace_entry->unix_ug.uid;
160	case GID_ACE:
161	DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
162	return (uint32_t)ace_entry->unix_ug.gid;
163	case WORLD_ACE:
164	default:
165	DEBUG(10,("get_entry_val: world ace\n"));
166	return (uint32_t)-1;
167	}
168	}
169
170	/************************************************************************
171	Create the on-disk format (always v2 now). Caller must free.
172	************************************************************************/
173
174	static char create_pai_buf_v2(canon_ace file_ace_list,
175	canon_ace *dir_ace_list,
176	uint16_t sd_type,
177	size_t *store_size)
178	{
179	char *pai_buf = NULL;
180	canon_ace *ace_list = NULL;
181	char *entry_offset = NULL;
182	unsigned int num_entries = 0;
183	unsigned int num_def_entries = 0;
184	unsigned int i;
185
186	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187	num_entries++;
188	}
189
190	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
191	num_def_entries++;
192	}
193
194	DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
195
196	*store_size = PAI_V2_ENTRIES_BASE +
197	((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
198
199	pai_buf = (char )SMB_MALLOC(store_size);
200	if (!pai_buf) {
201	return NULL;
202	}
203
204	/* Set up the header. */
205	memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
206	SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
207	SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
208	SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
209	SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
210
211	DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
212	(unsigned int)sd_type ));
213
214	entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
215
216	i = 0;
217	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
218	uint8_t type_val = (uint8_t)ace_list->owner_type;
219	uint32_t entry_val = get_entry_val(ace_list);
220
221	SCVAL(entry_offset,0,ace_list->ace_flags);
222	SCVAL(entry_offset,1,type_val);
223	SIVAL(entry_offset,2,entry_val);
224	DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
225	i,
226	(unsigned int)ace_list->ace_flags,
227	(unsigned int)type_val,
228	(unsigned int)entry_val ));
229	i++;
230	entry_offset += PAI_V2_ENTRY_LENGTH;
231	}
232
233	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
234	uint8_t type_val = (uint8_t)ace_list->owner_type;
235	uint32_t entry_val = get_entry_val(ace_list);
236
237	SCVAL(entry_offset,0,ace_list->ace_flags);
238	SCVAL(entry_offset,1,type_val);
239	SIVAL(entry_offset,2,entry_val);
240	DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
241	i,
242	(unsigned int)ace_list->ace_flags,
243	(unsigned int)type_val,
244	(unsigned int)entry_val ));
245	i++;
246	entry_offset += PAI_V2_ENTRY_LENGTH;
247	}
248
249	return pai_buf;
250	}
251
252	/************************************************************************
253	Store the user.SAMBA_PAI attribute on disk.
254	************************************************************************/
255
256	static void store_inheritance_attributes(files_struct *fsp,
257	canon_ace *file_ace_list,
258	canon_ace *dir_ace_list,
259	uint16_t sd_type)
260	{
261	int ret;
262	size_t store_size;
263	char *pai_buf;
264
265	if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
266	return;
267	}
268
269	pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
270	sd_type, &store_size);
271
272	if (fsp->fh->fd != -1) {
273	ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
274	pai_buf, store_size, 0);
275	} else {
276	ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
277	SAMBA_POSIX_INHERITANCE_EA_NAME,
278	pai_buf, store_size, 0);
279	}
280
281	SAFE_FREE(pai_buf);
282
283	DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
284	(unsigned int)sd_type,
285	fsp_str_dbg(fsp)));
286
287	if (ret == -1 && !no_acl_syscall_error(errno)) {
288	DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
289	}
290	}
291
292	/************************************************************************
293	Delete the in memory inheritance info.
294	************************************************************************/
295
296	static void free_inherited_info(struct pai_val *pal)
297	{
298	if (pal) {
299	struct pai_entry paie, paie_next;
300	for (paie = pal->entry_list; paie; paie = paie_next) {
301	paie_next = paie->next;
302	SAFE_FREE(paie);
303	}
304	for (paie = pal->def_entry_list; paie; paie = paie_next) {
305	paie_next = paie->next;
306	SAFE_FREE(paie);
307	}
308	SAFE_FREE(pal);
309	}
310	}
311
312	/************************************************************************
313	Get any stored ACE flags.
314	************************************************************************/
315
316	static uint16_t get_pai_flags(struct pai_val pal, canon_ace ace_entry, bool default_ace)
317	{
318	struct pai_entry *paie;
319
320	if (!pal) {
321	return 0;
322	}
323
324	/* If the entry exists it is inherited. */
325	for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
326	if (ace_entry->owner_type == paie->owner_type &&
327	get_entry_val(ace_entry) == get_pai_entry_val(paie))
328	return paie->ace_flags;
329	}
330	return 0;
331	}
332
333	/************************************************************************
334	Ensure an attribute just read is valid - v1.
335	************************************************************************/
336
337	static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
338	{
339	uint16 num_entries;
340	uint16 num_def_entries;
341
342	if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
343	/* Corrupted - too small. */
344	return false;
345	}
346
347	if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
348	return false;
349	}
350
351	num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
352	num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
353
354	/* Check the entry lists match. */
355	/* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
356
357	if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
358	PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
359	return false;
360	}
361
362	return true;
363	}
364
365	/************************************************************************
366	Ensure an attribute just read is valid - v2.
367	************************************************************************/
368
369	static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
370	{
371	uint16 num_entries;
372	uint16 num_def_entries;
373
374	if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
375	/* Corrupted - too small. */
376	return false;
377	}
378
379	if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
380	return false;
381	}
382
383	num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
384	num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
385
386	/* Check the entry lists match. */
387	/* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
388
389	if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
390	PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
391	return false;
392	}
393
394	return true;
395	}
396
397	/************************************************************************
398	Decode the owner.
399	************************************************************************/
400
401	static bool get_pai_owner_type(struct pai_entry paie, const char entry_offset)
402	{
403	paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
404	switch( paie->owner_type) {
405	case UID_ACE:
406	paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
407	DEBUG(10,("get_pai_owner_type: uid = %u\n",
408	(unsigned int)paie->unix_ug.uid ));
409	break;
410	case GID_ACE:
411	paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
412	DEBUG(10,("get_pai_owner_type: gid = %u\n",
413	(unsigned int)paie->unix_ug.gid ));
414	break;
415	case WORLD_ACE:
416	paie->unix_ug.world = -1;
417	DEBUG(10,("get_pai_owner_type: world ace\n"));
418	break;
419	default:
420	DEBUG(10,("get_pai_owner_type: unknown type %u\n",
421	(unsigned int)paie->owner_type ));
422	return false;
423	}
424	return true;
425	}
426
427	/************************************************************************
428	Process v2 entries.
429	************************************************************************/
430
431	static const char create_pai_v1_entries(struct pai_val paiv,
432	const char *entry_offset,
433	bool def_entry)
434	{
435	int i;
436
437	for (i = 0; i < paiv->num_entries; i++) {
438	struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
439	if (!paie) {
440	return NULL;
441	}
442
443	paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
444	if (!get_pai_owner_type(paie, entry_offset)) {
445	return NULL;
446	}
447
448	if (!def_entry) {
449	DLIST_ADD(paiv->entry_list, paie);
450	} else {
451	DLIST_ADD(paiv->def_entry_list, paie);
452	}
453	entry_offset += PAI_V1_ENTRY_LENGTH;
454	}
455	return entry_offset;
456	}
457
458	/************************************************************************
459	Convert to in-memory format from version 1.
460	************************************************************************/
461
462	static struct pai_val create_pai_val_v1(const char buf, size_t size)
463	{
464	const char *entry_offset;
465	struct pai_val *paiv = NULL;
466
467	if (!check_pai_ok_v1(buf, size)) {
468	return NULL;
469	}
470
471	paiv = SMB_MALLOC_P(struct pai_val);
472	if (!paiv) {
473	return NULL;
474	}
475
476	memset(paiv, '\0', sizeof(struct pai_val));
477
478	paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
479	SE_DESC_DACL_PROTECTED : 0;
480
481	paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
482	paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
483
484	entry_offset = buf + PAI_V1_ENTRIES_BASE;
485
486	DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
487	paiv->num_entries, paiv->num_def_entries ));
488
489	entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
490	if (entry_offset == NULL) {
491	free_inherited_info(paiv);
492	return NULL;
493	}
494	entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
495	if (entry_offset == NULL) {
496	free_inherited_info(paiv);
497	return NULL;
498	}
499
500	return paiv;
501	}
502
503	/************************************************************************
504	Process v2 entries.
505	************************************************************************/
506
507	static const char create_pai_v2_entries(struct pai_val paiv,
508	unsigned int num_entries,
509	const char *entry_offset,
510	bool def_entry)
511	{
512	unsigned int i;
513
514	for (i = 0; i < num_entries; i++) {
515	struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
516	if (!paie) {
517	return NULL;
518	}
519
520	paie->ace_flags = CVAL(entry_offset,0);
521
522	if (!get_pai_owner_type(paie, entry_offset+1)) {
523	return NULL;
524	}
525	if (!def_entry) {
526	DLIST_ADD(paiv->entry_list, paie);
527	} else {
528	DLIST_ADD(paiv->def_entry_list, paie);
529	}
530	entry_offset += PAI_V2_ENTRY_LENGTH;
531	}
532	return entry_offset;
533	}
534
535	/************************************************************************
536	Convert to in-memory format from version 2.
537	************************************************************************/
538
539	static struct pai_val create_pai_val_v2(const char buf, size_t size)
540	{
541	const char *entry_offset;
542	struct pai_val *paiv = NULL;
543
544	if (!check_pai_ok_v2(buf, size)) {
545	return NULL;
546	}
547
548	paiv = SMB_MALLOC_P(struct pai_val);
549	if (!paiv) {
550	return NULL;
551	}
552
553	memset(paiv, '\0', sizeof(struct pai_val));
554
555	paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
556
557	paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
558	paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
559
560	entry_offset = buf + PAI_V2_ENTRIES_BASE;
561
562	DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
563	(unsigned int)paiv->sd_type,
564	paiv->num_entries, paiv->num_def_entries ));
565
566	entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
567	entry_offset, false);
568	if (entry_offset == NULL) {
569	free_inherited_info(paiv);
570	return NULL;
571	}
572	entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
573	entry_offset, true);
574	if (entry_offset == NULL) {
575	free_inherited_info(paiv);
576	return NULL;
577	}
578
579	return paiv;
580	}
581
582	/************************************************************************
583	Convert to in-memory format - from either version 1 or 2.
584	************************************************************************/
585
586	static struct pai_val create_pai_val(const char buf, size_t size)
587	{
588	if (size < 1) {
589	return NULL;
590	}
591	if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
592	return create_pai_val_v1(buf, size);
593	} else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
594	return create_pai_val_v2(buf, size);
595	} else {
596	return NULL;
597	}
598	}
599
600	/************************************************************************
601	Load the user.SAMBA_PAI attribute.
602	************************************************************************/
603
604	static struct pai_val fload_inherited_info(files_struct fsp)
605	{
606	char *pai_buf;
607	size_t pai_buf_size = 1024;
608	struct pai_val *paiv = NULL;
609	ssize_t ret;
610
611	if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
612	return NULL;
613	}
614
615	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
616	return NULL;
617	}
618
619	do {
620	if (fsp->fh->fd != -1) {
621	ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
622	pai_buf, pai_buf_size);
623	} else {
624	ret = SMB_VFS_GETXATTR(fsp->conn,
625	fsp->fsp_name->base_name,
626	SAMBA_POSIX_INHERITANCE_EA_NAME,
627	pai_buf, pai_buf_size);
628	}
629
630	if (ret == -1) {
631	if (errno != ERANGE) {
632	break;
633	}
634	/* Buffer too small - enlarge it. */
635	pai_buf_size *= 2;
636	SAFE_FREE(pai_buf);
637	if (pai_buf_size > 1024*1024) {
638	return NULL; /* Limit malloc to 1mb. */
639	}
640	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
641	return NULL;
642	}
643	} while (ret == -1);
644
645	DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
646	(unsigned long)ret, fsp_str_dbg(fsp)));
647
648	if (ret == -1) {
649	/* No attribute or not supported. */
650	#if defined(ENOATTR)
651	if (errno != ENOATTR)
652	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
653	#else
654	if (errno != ENOSYS)
655	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
656	#endif
657	SAFE_FREE(pai_buf);
658	return NULL;
659	}
660
661	paiv = create_pai_val(pai_buf, ret);
662
663	if (paiv) {
664	DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
665	(unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
666	}
667
668	SAFE_FREE(pai_buf);
669	return paiv;
670	}
671
672	/************************************************************************
673	Load the user.SAMBA_PAI attribute.
674	************************************************************************/
675
676	static struct pai_val load_inherited_info(const struct connection_struct conn,
677	const char *fname)
678	{
679	char *pai_buf;
680	size_t pai_buf_size = 1024;
681	struct pai_val *paiv = NULL;
682	ssize_t ret;
683
684	if (!lp_map_acl_inherit(SNUM(conn))) {
685	return NULL;
686	}
687
688	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
689	return NULL;
690	}
691
692	do {
693	ret = SMB_VFS_GETXATTR(conn, fname,
694	SAMBA_POSIX_INHERITANCE_EA_NAME,
695	pai_buf, pai_buf_size);
696
697	if (ret == -1) {
698	if (errno != ERANGE) {
699	break;
700	}
701	/* Buffer too small - enlarge it. */
702	pai_buf_size *= 2;
703	SAFE_FREE(pai_buf);
704	if (pai_buf_size > 1024*1024) {
705	return NULL; /* Limit malloc to 1mb. */
706	}
707	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
708	return NULL;
709	}
710	} while (ret == -1);
711
712	DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
713
714	if (ret == -1) {
715	/* No attribute or not supported. */
716	#if defined(ENOATTR)
717	if (errno != ENOATTR)
718	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
719	#else
720	if (errno != ENOSYS)
721	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
722	#endif
723	SAFE_FREE(pai_buf);
724	return NULL;
725	}
726
727	paiv = create_pai_val(pai_buf, ret);
728
729	if (paiv) {
730	DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
731	(unsigned int)paiv->sd_type,
732	fname));
733	}
734
735	SAFE_FREE(pai_buf);
736	return paiv;
737	}
738
739	/****************************************************************************
740	Functions to manipulate the internal ACE format.
741	****************************************************************************/
742
743	/****************************************************************************
744	Count a linked list of canonical ACE entries.
745	****************************************************************************/
746
747	static size_t count_canon_ace_list( canon_ace *l_head )
748	{
749	size_t count = 0;
750	canon_ace *ace;
751
752	for (ace = l_head; ace; ace = ace->next)
753	count++;
754
755	return count;
756	}
757
758	/****************************************************************************
759	Free a linked list of canonical ACE entries.
760	****************************************************************************/
761
762	static void free_canon_ace_list( canon_ace *l_head )
763	{
764	canon_ace list, next;
765
766	for (list = l_head; list; list = next) {
767	next = list->next;
768	DLIST_REMOVE(l_head, list);
769	SAFE_FREE(list);
770	}
771	}
772
773	/****************************************************************************
774	Function to duplicate a canon_ace entry.
775	****************************************************************************/
776
777	static canon_ace dup_canon_ace( canon_ace src_ace)
778	{
779	canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
780
781	if (dst_ace == NULL)
782	return NULL;
783
784	dst_ace = src_ace;
785	dst_ace->prev = dst_ace->next = NULL;
786	return dst_ace;
787	}
788
789	/****************************************************************************
790	Print out a canon ace.
791	****************************************************************************/
792
793	static void print_canon_ace(canon_ace *pace, int num)
794	{
795	dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
796	dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
797	if (pace->owner_type == UID_ACE) {
798	const char *u_name = uidtoname(pace->unix_ug.uid);
799	dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
800	} else if (pace->owner_type == GID_ACE) {
801	char *g_name = gidtoname(pace->unix_ug.gid);
802	dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
803	} else
804	dbgtext( "other ");
805	switch (pace->type) {
806	case SMB_ACL_USER:
807	dbgtext( "SMB_ACL_USER ");
808	break;
809	case SMB_ACL_USER_OBJ:
810	dbgtext( "SMB_ACL_USER_OBJ ");
811	break;
812	case SMB_ACL_GROUP:
813	dbgtext( "SMB_ACL_GROUP ");
814	break;
815	case SMB_ACL_GROUP_OBJ:
816	dbgtext( "SMB_ACL_GROUP_OBJ ");
817	break;
818	case SMB_ACL_OTHER:
819	dbgtext( "SMB_ACL_OTHER ");
820	break;
821	default:
822	dbgtext( "MASK " );
823	break;
824	}
825
826	dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
827	dbgtext( "perms ");
828	dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
829	dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
830	dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
831	}
832
833	/****************************************************************************
834	Print out a canon ace list.
835	****************************************************************************/
836
837	static void print_canon_ace_list(const char name, canon_ace ace_list)
838	{
839	int count = 0;
840
841	if( DEBUGLVL( 10 )) {
842	dbgtext( "print_canon_ace_list: %s\n", name );
843	for (;ace_list; ace_list = ace_list->next, count++)
844	print_canon_ace(ace_list, count );
845	}
846	}
847
848	/****************************************************************************
849	Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
850	****************************************************************************/
851
852	static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
853	{
854	mode_t ret = 0;
855
856	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
857	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
858	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
859
860	return ret;
861	}
862
863	/****************************************************************************
864	Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
865	****************************************************************************/
866
867	static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
868	{
869	mode_t ret = 0;
870
871	if (mode & r_mask)
872	ret \|= S_IRUSR;
873	if (mode & w_mask)
874	ret \|= S_IWUSR;
875	if (mode & x_mask)
876	ret \|= S_IXUSR;
877
878	return ret;
879	}
880
881	/****************************************************************************
882	Map canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits) to
883	an SMB_ACL_PERMSET_T.
884	****************************************************************************/
885
886	static int map_acl_perms_to_permset(connection_struct conn, mode_t mode, SMB_ACL_PERMSET_T p_permset)
887	{
888	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
889	return -1;
890	if (mode & S_IRUSR) {
891	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
892	return -1;
893	}
894	if (mode & S_IWUSR) {
895	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
896	return -1;
897	}
898	if (mode & S_IXUSR) {
899	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
900	return -1;
901	}
902	return 0;
903	}
904
905	/****************************************************************************
906	Function to create owner and group SIDs from a SMB_STRUCT_STAT.
907	****************************************************************************/
908
909	void create_file_sids(const SMB_STRUCT_STAT psbuf, DOM_SID powner_sid, DOM_SID *pgroup_sid)
910	{
911	uid_to_sid( powner_sid, psbuf->st_ex_uid );
912	gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
913	}
914
915	/****************************************************************************
916	Merge aces with a common sid - if both are allow or deny, OR the permissions together and
917	delete the second one. If the first is deny, mask the permissions off and delete the allow
918	if the permissions become zero, delete the deny if the permissions are non zero.
919	****************************************************************************/
920
921	static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
922	{
923	canon_ace l_head = pp_list_head;
924	canon_ace *curr_ace_outer;
925	canon_ace *curr_ace_outer_next;
926
927	/*
928	* First, merge allow entries with identical SIDs, and deny entries
929	* with identical SIDs.
930	*/
931
932	for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
933	canon_ace *curr_ace;
934	canon_ace *curr_ace_next;
935
936	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
937
938	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
939	bool can_merge = false;
940
941	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
942
943	/* For file ACLs we can merge if the SIDs and ALLOW/DENY
944	* types are the same. For directory acls we must also
945	* ensure the POSIX ACL types are the same. */
946
947	if (!dir_acl) {
948	can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
949	(curr_ace->attr == curr_ace_outer->attr));
950	} else {
951	can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
952	(curr_ace->type == curr_ace_outer->type) &&
953	(curr_ace->attr == curr_ace_outer->attr));
954	}
955
956	if (can_merge) {
957	if( DEBUGLVL( 10 )) {
958	dbgtext("merge_aces: Merging ACE's\n");
959	print_canon_ace( curr_ace_outer, 0);
960	print_canon_ace( curr_ace, 0);
961	}
962
963	/* Merge two allow or two deny ACE's. */
964
965	/* Theoretically we shouldn't merge a dir ACE if
966	* one ACE has the CI flag set, and the other
967	* ACE has the OI flag set, but this is rare
968	* enough we can ignore it. */
969
970	curr_ace_outer->perms \|= curr_ace->perms;
971	curr_ace_outer->ace_flags \|= curr_ace->ace_flags;
972	DLIST_REMOVE(l_head, curr_ace);
973	SAFE_FREE(curr_ace);
974	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
975	}
976	}
977	}
978
979	/*
980	* Now go through and mask off allow permissions with deny permissions.
981	* We can delete either the allow or deny here as we know that each SID
982	* appears only once in the list.
983	*/
984
985	for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
986	canon_ace *curr_ace;
987	canon_ace *curr_ace_next;
988
989	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
990
991	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
992
993	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
994
995	/*
996	* Subtract ACE's with different entries. Due to the ordering constraints
997	* we've put on the ACL, we know the deny must be the first one.
998	*/
999
1000	if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001	(curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003	if( DEBUGLVL( 10 )) {
1004	dbgtext("merge_aces: Masking ACE's\n");
1005	print_canon_ace( curr_ace_outer, 0);
1006	print_canon_ace( curr_ace, 0);
1007	}
1008
1009	curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011	if (curr_ace->perms == 0) {
1012
1013	/*
1014	* The deny overrides the allow. Remove the allow.
1015	*/
1016
1017	DLIST_REMOVE(l_head, curr_ace);
1018	SAFE_FREE(curr_ace);
1019	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021	} else {
1022
1023	/*
1024	* Even after removing permissions, there
1025	* are still allow permissions - delete the deny.
1026	* It is safe to delete the deny here,
1027	* as we are guarenteed by the deny first
1028	* ordering that all the deny entries for
1029	* this SID have already been merged into one
1030	* before we can get to an allow ace.
1031	*/
1032
1033	DLIST_REMOVE(l_head, curr_ace_outer);
1034	SAFE_FREE(curr_ace_outer);
1035	break;
1036	}
1037	}
1038
1039	} /* end for curr_ace */
1040	} /* end for curr_ace_outer */
1041
1042	/* We may have modified the list. */
1043
1044	*pp_list_head = l_head;
1045	}
1046
1047	/****************************************************************************
1048	Check if we need to return NT4.x compatible ACL entries.
1049	****************************************************************************/
1050
1051	bool nt4_compatible_acls(void)
1052	{
1053	int compat = lp_acl_compatibility();
1054
1055	if (compat == ACL_COMPAT_AUTO) {
1056	enum remote_arch_types ra_type = get_remote_arch();
1057
1058	/* Automatically adapt to client */
1059	return (ra_type <= RA_WINNT);
1060	} else
1061	return (compat == ACL_COMPAT_WINNT);
1062	}
1063
1064
1065	/****************************************************************************
1066	Map canon_ace perms to permission bits NT.
1067	The attr element is not used here - we only process deny entries on set,
1068	not get. Deny entries are implicit on get with ace->perms = 0.
1069	****************************************************************************/
1070
1071	uint32_t map_canon_ace_perms(int snum,
1072	enum security_ace_type *pacl_type,
1073	mode_t perms,
1074	bool directory_ace)
1075	{
1076	uint32_t nt_mask = 0;
1077
1078	*pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080	if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081	if (directory_ace) {
1082	nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083	} else {
1084	nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085	}
1086	} else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087	/*
1088	* Windows NT refuses to display ACEs with no permissions in them (but
1089	* they are perfectly legal with Windows 2000). If the ACE has empty
1090	* permissions we cannot use 0, so we use the otherwise unused
1091	* WRITE_OWNER permission, which we ignore when we set an ACL.
1092	* We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093	* to be changed in the future.
1094	*/
1095
1096	if (nt4_compatible_acls())
1097	nt_mask = UNIX_ACCESS_NONE;
1098	else
1099	nt_mask = 0;
1100	} else {
1101	if (directory_ace) {
1102	nt_mask \|= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103	nt_mask \|= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104	nt_mask \|= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105	} else {
1106	nt_mask \|= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107	nt_mask \|= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108	nt_mask \|= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109	}
1110	}
1111
1112	if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113	nt_mask \|= (SEC_STD_WRITE_DAC\|SEC_STD_WRITE_OWNER\|DELETE_ACCESS);
1114	}
1115
1116	DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117	(unsigned int)perms, (unsigned int)nt_mask ));
1118
1119	return nt_mask;
1120	}
1121
1122	/****************************************************************************
1123	Map NT perms to a UNIX mode_t.
1124	****************************************************************************/
1125
1126	#define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA\|FILE_READ_EA\|FILE_READ_ATTRIBUTES)
1127	#define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA\|FILE_APPEND_DATA\|FILE_WRITE_EA\|FILE_WRITE_ATTRIBUTES)
1128	#define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130	static mode_t map_nt_perms( uint32 *mask, int type)
1131	{
1132	mode_t mode = 0;
1133
1134	switch(type) {
1135	case S_IRUSR:
1136	if((*mask) & GENERIC_ALL_ACCESS)
1137	mode = S_IRUSR\|S_IWUSR\|S_IXUSR;
1138	else {
1139	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142	}
1143	break;
1144	case S_IRGRP:
1145	if((*mask) & GENERIC_ALL_ACCESS)
1146	mode = S_IRGRP\|S_IWGRP\|S_IXGRP;
1147	else {
1148	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151	}
1152	break;
1153	case S_IROTH:
1154	if((*mask) & GENERIC_ALL_ACCESS)
1155	mode = S_IROTH\|S_IWOTH\|S_IXOTH;
1156	else {
1157	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160	}
1161	break;
1162	}
1163
1164	return mode;
1165	}
1166
1167	/****************************************************************************
1168	Unpack a SEC_DESC into a UNIX owner and group.
1169	****************************************************************************/
1170
1171	NTSTATUS unpack_nt_owners(int snum, uid_t puser, gid_t pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172	{
1173	DOM_SID owner_sid;
1174	DOM_SID grp_sid;
1175
1176	*puser = (uid_t)-1;
1177	*pgrp = (gid_t)-1;
1178
1179	if(security_info_sent == 0) {
1180	DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181	return NT_STATUS_OK;
1182	}
1183
1184	/*
1185	* Validate the owner and group SID's.
1186	*/
1187
1188	memset(&owner_sid, '\0', sizeof(owner_sid));
1189	memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191	DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193	/*
1194	* Don't immediately fail if the owner sid cannot be validated.
1195	* This may be a group chown only set.
1196	*/
1197
1198	if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199	sid_copy(&owner_sid, psd->owner_sid);
1200	if (!sid_to_uid(&owner_sid, puser)) {
1201	if (lp_force_unknown_acl_user(snum)) {
1202	/* this allows take ownership to work
1203	* reasonably */
1204	*puser = current_user.ut.uid;
1205	} else {
1206	DEBUG(3,("unpack_nt_owners: unable to validate"
1207	" owner sid for %s\n",
1208	sid_string_dbg(&owner_sid)));
1209	return NT_STATUS_INVALID_OWNER;
1210	}
1211	}
1212	DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213	(unsigned int)*puser ));
1214	}
1215
1216	/*
1217	* Don't immediately fail if the group sid cannot be validated.
1218	* This may be an owner chown only set.
1219	*/
1220
1221	if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222	sid_copy(&grp_sid, psd->group_sid);
1223	if (!sid_to_gid( &grp_sid, pgrp)) {
1224	if (lp_force_unknown_acl_user(snum)) {
1225	/* this allows take group ownership to work
1226	* reasonably */
1227	*pgrp = current_user.ut.gid;
1228	} else {
1229	DEBUG(3,("unpack_nt_owners: unable to validate"
1230	" group sid.\n"));
1231	return NT_STATUS_INVALID_OWNER;
1232	}
1233	}
1234	DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235	(unsigned int)*pgrp));
1236	}
1237
1238	DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240	return NT_STATUS_OK;
1241	}
1242
1243	/****************************************************************************
1244	Ensure the enforced permissions for this share apply.
1245	****************************************************************************/
1246
1247	static void apply_default_perms(const struct share_params *params,
1248	const bool is_directory, canon_ace *pace,
1249	mode_t type)
1250	{
1251	mode_t and_bits = (mode_t)0;
1252	mode_t or_bits = (mode_t)0;
1253
1254	/* Get the initial bits to apply. */
1255
1256	if (is_directory) {
1257	and_bits = lp_dir_security_mask(params->service);
1258	or_bits = lp_force_dir_security_mode(params->service);
1259	} else {
1260	and_bits = lp_security_mask(params->service);
1261	or_bits = lp_force_security_mode(params->service);
1262	}
1263
1264	/* Now bounce them into the S_USR space. */
1265	switch(type) {
1266	case S_IRUSR:
1267	/* Ensure owner has read access. */
1268	pace->perms \|= S_IRUSR;
1269	if (is_directory)
1270	pace->perms \|= (S_IWUSR\|S_IXUSR);
1271	and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272	or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273	break;
1274	case S_IRGRP:
1275	and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276	or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277	break;
1278	case S_IROTH:
1279	and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280	or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281	break;
1282	}
1283
1284	pace->perms = ((pace->perms & and_bits)\|or_bits);
1285	}
1286
1287	/****************************************************************************
1288	Check if a given uid/SID is in a group gid/SID. This is probably very
1289	expensive and will need optimisation. A lot of optimisation :-). JRA.
1290	****************************************************************************/
1291
1292	static bool uid_entry_in_group( canon_ace uid_ace, canon_ace group_ace )
1293	{
1294	const char *u_name = NULL;
1295
1296	/* "Everyone" always matches every uid. */
1297
1298	if (sid_equal(&group_ace->trustee, &global_sid_World))
1299	return True;
1300
1301	/*
1302	* if it's the current user, we already have the unix token
1303	* and don't need to do the complex user_in_group_sid() call
1304	*/
1305	if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306	size_t i;
1307
1308	if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309	return True;
1310	}
1311
1312	for (i=0; i < current_user.ut.ngroups; i++) {
1313	if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314	return True;
1315	}
1316	}
1317	}
1318
1319	/* u_name talloc'ed off tos. */
1320	u_name = uidtoname(uid_ace->unix_ug.uid);
1321	if (!u_name) {
1322	return False;
1323	}
1324
1325	/*
1326	* user_in_group_sid() uses create_token_from_username()
1327	* which creates an artificial NT token given just a username,
1328	* so this is not reliable for users from foreign domains
1329	* exported by winbindd!
1330	*/
1331	return user_in_group_sid(u_name, &group_ace->trustee);
1332	}
1333
1334	/****************************************************************************
1335	A well formed POSIX file or default ACL has at least 3 entries, a
1336	SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337	In addition, the owner must always have at least read access.
1338	When using this call on get_acl, the pst struct is valid and contains
1339	the mode of the file. When using this call on set_acl, the pst struct has
1340	been modified to have a mode containing the default for this file or directory
1341	type.
1342	****************************************************************************/
1343
1344	static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345	const struct share_params *params,
1346	const bool is_directory,
1347	const DOM_SID *pfile_owner_sid,
1348	const DOM_SID *pfile_grp_sid,
1349	const SMB_STRUCT_STAT *pst,
1350	bool setting_acl)
1351	{
1352	canon_ace *pace;
1353	bool got_user = False;
1354	bool got_grp = False;
1355	bool got_other = False;
1356	canon_ace *pace_other = NULL;
1357
1358	for (pace = *pp_ace; pace; pace = pace->next) {
1359	if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361	if (setting_acl)
1362	apply_default_perms(params, is_directory, pace, S_IRUSR);
1363	got_user = True;
1364
1365	} else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367	/*
1368	* Ensure create mask/force create mode is respected on set.
1369	*/
1370
1371	if (setting_acl)
1372	apply_default_perms(params, is_directory, pace, S_IRGRP);
1373	got_grp = True;
1374
1375	} else if (pace->type == SMB_ACL_OTHER) {
1376
1377	/*
1378	* Ensure create mask/force create mode is respected on set.
1379	*/
1380
1381	if (setting_acl)
1382	apply_default_perms(params, is_directory, pace, S_IROTH);
1383	got_other = True;
1384	pace_other = pace;
1385	}
1386	}
1387
1388	if (!got_user) {
1389	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391	return False;
1392	}
1393
1394	ZERO_STRUCTP(pace);
1395	pace->type = SMB_ACL_USER_OBJ;
1396	pace->owner_type = UID_ACE;
1397	pace->unix_ug.uid = pst->st_ex_uid;
1398	pace->trustee = *pfile_owner_sid;
1399	pace->attr = ALLOW_ACE;
1400
1401	if (setting_acl) {
1402	/* See if the owning user is in any of the other groups in
1403	the ACE. If so, OR in the permissions from that group. */
1404
1405	bool group_matched = False;
1406	canon_ace *pace_iter;
1407
1408	for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1409	if (pace_iter->type == SMB_ACL_GROUP_OBJ \|\| pace_iter->type == SMB_ACL_GROUP) {
1410	if (uid_entry_in_group(pace, pace_iter)) {
1411	pace->perms \|= pace_iter->perms;
1412	group_matched = True;
1413	}
1414	}
1415	}
1416
1417	/* If we only got an "everyone" perm, just use that. */
1418	if (!group_matched) {
1419	if (got_other)
1420	pace->perms = pace_other->perms;
1421	else
1422	pace->perms = 0;
1423	}
1424
1425	apply_default_perms(params, is_directory, pace, S_IRUSR);
1426	} else {
1427	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1428	}
1429
1430	DLIST_ADD(*pp_ace, pace);
1431	}
1432
1433	if (!got_grp) {
1434	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1435	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1436	return False;
1437	}
1438
1439	ZERO_STRUCTP(pace);
1440	pace->type = SMB_ACL_GROUP_OBJ;
1441	pace->owner_type = GID_ACE;
1442	pace->unix_ug.uid = pst->st_ex_gid;
1443	pace->trustee = *pfile_grp_sid;
1444	pace->attr = ALLOW_ACE;
1445	if (setting_acl) {
1446	/* If we only got an "everyone" perm, just use that. */
1447	if (got_other)
1448	pace->perms = pace_other->perms;
1449	else
1450	pace->perms = 0;
1451	apply_default_perms(params, is_directory, pace, S_IRGRP);
1452	} else {
1453	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1454	}
1455
1456	DLIST_ADD(*pp_ace, pace);
1457	}
1458
1459	if (!got_other) {
1460	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1461	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1462	return False;
1463	}
1464
1465	ZERO_STRUCTP(pace);
1466	pace->type = SMB_ACL_OTHER;
1467	pace->owner_type = WORLD_ACE;
1468	pace->unix_ug.world = -1;
1469	pace->trustee = global_sid_World;
1470	pace->attr = ALLOW_ACE;
1471	if (setting_acl) {
1472	pace->perms = 0;
1473	apply_default_perms(params, is_directory, pace, S_IROTH);
1474	} else
1475	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1476
1477	DLIST_ADD(*pp_ace, pace);
1478	}
1479
1480	return True;
1481	}
1482
1483	/****************************************************************************
1484	Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1485	If it does not have them, check if there are any entries where the trustee is the
1486	file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1487	****************************************************************************/
1488
1489	static void check_owning_objs(canon_ace ace, DOM_SID pfile_owner_sid, DOM_SID *pfile_grp_sid)
1490	{
1491	bool got_user_obj, got_group_obj;
1492	canon_ace *current_ace;
1493	int i, entries;
1494
1495	entries = count_canon_ace_list(ace);
1496	got_user_obj = False;
1497	got_group_obj = False;
1498
1499	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1500	if (current_ace->type == SMB_ACL_USER_OBJ)
1501	got_user_obj = True;
1502	else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1503	got_group_obj = True;
1504	}
1505	if (got_user_obj && got_group_obj) {
1506	DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1507	return;
1508	}
1509
1510	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1511	if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1512	sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1513	current_ace->type = SMB_ACL_USER_OBJ;
1514	got_user_obj = True;
1515	}
1516	if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1517	sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1518	current_ace->type = SMB_ACL_GROUP_OBJ;
1519	got_group_obj = True;
1520	}
1521	}
1522	if (!got_user_obj)
1523	DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1524	if (!got_group_obj)
1525	DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1526	}
1527
1528	/****************************************************************************
1529	If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1530	If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1531	****************************************************************************/
1532
1533	static bool dup_owning_ace(canon_ace dir_ace, canon_ace ace)
1534	{
1535	/* dir ace must be followings.
1536	SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1537	SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1538	SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1539	Posix ACL u:trustee:perm
1540
1541	SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1542	SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1543	SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1544	Posix ACL g:trustee:perm
1545	*/
1546
1547	if (ace->type == SMB_ACL_USER_OBJ &&
1548	!(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1549	canon_ace *dup_ace = dup_canon_ace(ace);
1550
1551	if (dup_ace == NULL) {
1552	return false;
1553	}
1554	dup_ace->type = SMB_ACL_USER;
1555	DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1556	}
1557
1558	if (ace->type == SMB_ACL_GROUP_OBJ &&
1559	!(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1560	canon_ace *dup_ace = dup_canon_ace(ace);
1561
1562	if (dup_ace == NULL) {
1563	return false;
1564	}
1565	dup_ace->type = SMB_ACL_GROUP;
1566	DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1567	}
1568
1569	return true;
1570	}
1571
1572	/****************************************************************************
1573	Unpack a SEC_DESC into two canonical ace lists.
1574	****************************************************************************/
1575
1576	static bool create_canon_ace_lists(files_struct *fsp,
1577	const SMB_STRUCT_STAT *pst,
1578	DOM_SID *pfile_owner_sid,
1579	DOM_SID *pfile_grp_sid,
1580	canon_ace **ppfile_ace,
1581	canon_ace **ppdir_ace,
1582	const SEC_ACL *dacl)
1583	{
1584	bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1585	canon_ace *file_ace = NULL;
1586	canon_ace *dir_ace = NULL;
1587	canon_ace *current_ace = NULL;
1588	bool got_dir_allow = False;
1589	bool got_file_allow = False;
1590	int i, j;
1591
1592	*ppfile_ace = NULL;
1593	*ppdir_ace = NULL;
1594
1595	/*
1596	* Convert the incoming ACL into a more regular form.
1597	*/
1598
1599	for(i = 0; i < dacl->num_aces; i++) {
1600	SEC_ACE *psa = &dacl->aces[i];
1601
1602	if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1603	DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1604	return False;
1605	}
1606
1607	if (nt4_compatible_acls()) {
1608	/*
1609	* The security mask may be UNIX_ACCESS_NONE which should map into
1610	* no permissions (we overload the WRITE_OWNER bit for this) or it
1611	* should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1612	* to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1613	*/
1614
1615	/*
1616	* Convert GENERIC bits to specific bits.
1617	*/
1618
1619	se_map_generic(&psa->access_mask, &file_generic_mapping);
1620
1621	psa->access_mask &= (UNIX_ACCESS_NONE\|FILE_ALL_ACCESS);
1622
1623	if(psa->access_mask != UNIX_ACCESS_NONE)
1624	psa->access_mask &= ~UNIX_ACCESS_NONE;
1625	}
1626	}
1627
1628	/*
1629	* Deal with the fact that NT 4.x re-writes the canonical format
1630	* that we return for default ACLs. If a directory ACE is identical
1631	* to a inherited directory ACE then NT changes the bits so that the
1632	* first ACE is set to OI\|IO and the second ACE for this SID is set
1633	* to CI. We need to repair this. JRA.
1634	*/
1635
1636	for(i = 0; i < dacl->num_aces; i++) {
1637	SEC_ACE *psa1 = &dacl->aces[i];
1638
1639	for (j = i + 1; j < dacl->num_aces; j++) {
1640	SEC_ACE *psa2 = &dacl->aces[j];
1641
1642	if (psa1->access_mask != psa2->access_mask)
1643	continue;
1644
1645	if (!sid_equal(&psa1->trustee, &psa2->trustee))
1646	continue;
1647
1648	/*
1649	* Ok - permission bits and SIDs are equal.
1650	* Check if flags were re-written.
1651	*/
1652
1653	if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1654
1655	psa1->flags \|= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1656	psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1657
1658	} else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1659
1660	psa2->flags \|= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1661	psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1662
1663	}
1664	}
1665	}
1666
1667	for(i = 0; i < dacl->num_aces; i++) {
1668	SEC_ACE *psa = &dacl->aces[i];
1669
1670	/*
1671	* Create a cannon_ace entry representing this NT DACL ACE.
1672	*/
1673
1674	if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1675	free_canon_ace_list(file_ace);
1676	free_canon_ace_list(dir_ace);
1677	DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1678	return False;
1679	}
1680
1681	ZERO_STRUCTP(current_ace);
1682
1683	sid_copy(&current_ace->trustee, &psa->trustee);
1684
1685	/*
1686	* Try and work out if the SID is a user or group
1687	* as we need to flag these differently for POSIX.
1688	* Note what kind of a POSIX ACL this should map to.
1689	*/
1690
1691	if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1692	current_ace->owner_type = WORLD_ACE;
1693	current_ace->unix_ug.world = -1;
1694	current_ace->type = SMB_ACL_OTHER;
1695	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1696	current_ace->owner_type = UID_ACE;
1697	current_ace->unix_ug.uid = pst->st_ex_uid;
1698	current_ace->type = SMB_ACL_USER_OBJ;
1699
1700	/*
1701	* The Creator Owner entry only specifies inheritable permissions,
1702	* never access permissions. WinNT doesn't always set the ACE to
1703	* INHERIT_ONLY, though.
1704	*/
1705
1706	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1707
1708	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1709	current_ace->owner_type = GID_ACE;
1710	current_ace->unix_ug.gid = pst->st_ex_gid;
1711	current_ace->type = SMB_ACL_GROUP_OBJ;
1712
1713	/*
1714	* The Creator Group entry only specifies inheritable permissions,
1715	* never access permissions. WinNT doesn't always set the ACE to
1716	* INHERIT_ONLY, though.
1717	*/
1718	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1719
1720	} else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1721	current_ace->owner_type = UID_ACE;
1722	/* If it's the owning user, this is a user_obj, not
1723	* a user. */
1724	if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1725	current_ace->type = SMB_ACL_USER_OBJ;
1726	} else {
1727	current_ace->type = SMB_ACL_USER;
1728	}
1729	} else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1730	current_ace->owner_type = GID_ACE;
1731	/* If it's the primary group, this is a group_obj, not
1732	* a group. */
1733	if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1734	current_ace->type = SMB_ACL_GROUP_OBJ;
1735	} else {
1736	current_ace->type = SMB_ACL_GROUP;
1737	}
1738	} else {
1739	/*
1740	* Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1741	*/
1742
1743	if (non_mappable_sid(&psa->trustee)) {
1744	DEBUG(10, ("create_canon_ace_lists: ignoring "
1745	"non-mappable SID %s\n",
1746	sid_string_dbg(&psa->trustee)));
1747	SAFE_FREE(current_ace);
1748	continue;
1749	}
1750
1751	free_canon_ace_list(file_ace);
1752	free_canon_ace_list(dir_ace);
1753	DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1754	"%s to uid or gid.\n",
1755	sid_string_dbg(&current_ace->trustee)));
1756	SAFE_FREE(current_ace);
1757	return False;
1758	}
1759
1760	/*
1761	* Map the given NT permissions into a UNIX mode_t containing only
1762	* S_I(R\|W\|X)USR bits.
1763	*/
1764
1765	current_ace->perms \|= map_nt_perms( &psa->access_mask, S_IRUSR);
1766	current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1767
1768	/* Store the ace_flag. */
1769	current_ace->ace_flags = psa->flags;
1770
1771	/*
1772	* Now add the created ace to either the file list, the directory
1773	* list, or both. We MUST preserve the order here (hence we use
1774	* DLIST_ADD_END) as NT ACLs are order dependent.
1775	*/
1776
1777	if (fsp->is_directory) {
1778
1779	/*
1780	* We can only add to the default POSIX ACE list if the ACE is
1781	* designed to be inherited by both files and directories.
1782	*/
1783
1784	if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1785	(SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1786
1787	DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1788
1789	/*
1790	* Note if this was an allow ace. We can't process
1791	* any further deny ace's after this.
1792	*/
1793
1794	if (current_ace->attr == ALLOW_ACE)
1795	got_dir_allow = True;
1796
1797	if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1798	DEBUG(0,("create_canon_ace_lists: "
1799	"malformed ACL in "
1800	"inheritable ACL! Deny entry "
1801	"after Allow entry. Failing "
1802	"to set on file %s.\n",
1803	fsp_str_dbg(fsp)));
1804	free_canon_ace_list(file_ace);
1805	free_canon_ace_list(dir_ace);
1806	return False;
1807	}
1808
1809	if( DEBUGLVL( 10 )) {
1810	dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1811	print_canon_ace( current_ace, 0);
1812	}
1813
1814	/*
1815	* We have a lossy mapping: directory ACE entries
1816	* CREATOR_OWNER ------\
1817	* (map to) +---> SMB_ACL_USER_OBJ
1818	* owning sid ------/
1819	*
1820	* CREATOR_GROUP ------\
1821	* (map to) +---> SMB_ACL_GROUP_OBJ
1822	* primary group sid --/
1823	*
1824	* on set. And on read of a directory ACL
1825	*
1826	* SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1827	* SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1828	*
1829	* Deal with this on set by duplicating
1830	* owning sid and primary group sid ACE
1831	* entries into the directory ACL.
1832	* Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1833	*/
1834
1835	if (!dup_owning_ace(dir_ace, current_ace)) {
1836	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1837	free_canon_ace_list(file_ace);
1838	free_canon_ace_list(dir_ace);
1839	return false;
1840	}
1841
1842	/*
1843	* If this is not an inherit only ACE we need to add a duplicate
1844	* to the file acl.
1845	*/
1846
1847	if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1848	canon_ace *dup_ace = dup_canon_ace(current_ace);
1849
1850	if (!dup_ace) {
1851	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1852	free_canon_ace_list(file_ace);
1853	free_canon_ace_list(dir_ace);
1854	return False;
1855	}
1856
1857	/*
1858	* We must not free current_ace here as its
1859	* pointer is now owned by the dir_ace list.
1860	*/
1861	current_ace = dup_ace;
1862	/* We've essentially split this ace into two,
1863	* and added the ace with inheritance request
1864	* bits to the directory ACL. Drop those bits for
1865	* the ACE we're adding to the file list. */
1866	current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT\|
1867	SEC_ACE_FLAG_CONTAINER_INHERIT\|
1868	SEC_ACE_FLAG_INHERIT_ONLY);
1869	} else {
1870	/*
1871	* We must not free current_ace here as its
1872	* pointer is now owned by the dir_ace list.
1873	*/
1874	current_ace = NULL;
1875	}
1876	}
1877	}
1878
1879	/*
1880	* Only add to the file ACL if not inherit only.
1881	*/
1882
1883	if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1884	DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1885
1886	/*
1887	* Note if this was an allow ace. We can't process
1888	* any further deny ace's after this.
1889	*/
1890
1891	if (current_ace->attr == ALLOW_ACE)
1892	got_file_allow = True;
1893
1894	if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1895	DEBUG(0,("create_canon_ace_lists: malformed "
1896	"ACL in file ACL ! Deny entry after "
1897	"Allow entry. Failing to set on file "
1898	"%s.\n", fsp_str_dbg(fsp)));
1899	free_canon_ace_list(file_ace);
1900	free_canon_ace_list(dir_ace);
1901	return False;
1902	}
1903
1904	if( DEBUGLVL( 10 )) {
1905	dbgtext("create_canon_ace_lists: adding file ACL:\n");
1906	print_canon_ace( current_ace, 0);
1907	}
1908	all_aces_are_inherit_only = False;
1909	/*
1910	* We must not free current_ace here as its
1911	* pointer is now owned by the file_ace list.
1912	*/
1913	current_ace = NULL;
1914	}
1915
1916	/*
1917	* Free if ACE was not added.
1918	*/
1919
1920	SAFE_FREE(current_ace);
1921	}
1922
1923	if (fsp->is_directory && all_aces_are_inherit_only) {
1924	/*
1925	* Windows 2000 is doing one of these weird 'inherit acl'
1926	* traverses to conserve NTFS ACL resources. Just pretend
1927	* there was no DACL sent. JRA.
1928	*/
1929
1930	DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1931	free_canon_ace_list(file_ace);
1932	free_canon_ace_list(dir_ace);
1933	file_ace = NULL;
1934	dir_ace = NULL;
1935	} else {
1936	/*
1937	* Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1938	* ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1939	* entries can be converted to *_OBJ. Usually we will already have these
1940	* entries in the Default ACL, and the Access ACL will not have them.
1941	*/
1942	if (file_ace) {
1943	check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1944	}
1945	if (dir_ace) {
1946	check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1947	}
1948	}
1949
1950	*ppfile_ace = file_ace;
1951	*ppdir_ace = dir_ace;
1952
1953	return True;
1954	}
1955
1956	/****************************************************************************
1957	ASCII art time again... JRA :-).
1958
1959	We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1960	we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1961	entries). Secondly, the merge code has ensured that all duplicate SID entries for
1962	allow or deny have been merged, so the same SID can only appear once in the deny
1963	list or once in the allow list.
1964
1965	We then process as follows :
1966
1967	---------------------------------------------------------------------------
1968	First pass - look for a Everyone DENY entry.
1969
1970	If it is deny all (rwx) trunate the list at this point.
1971	Else, walk the list from this point and use the deny permissions of this
1972	entry as a mask on all following allow entries. Finally, delete
1973	the Everyone DENY entry (we have applied it to everything possible).
1974
1975	In addition, in this pass we remove any DENY entries that have
1976	no permissions (ie. they are a DENY nothing).
1977	---------------------------------------------------------------------------
1978	Second pass - only deal with deny user entries.
1979
1980	DENY user1 (perms XXX)
1981
1982	new_perms = 0
1983	for all following allow group entries where user1 is in group
1984	new_perms \|= group_perms;
1985
1986	user1 entry perms = new_perms & ~ XXX;
1987
1988	Convert the deny entry to an allow entry with the new perms and
1989	push to the end of the list. Note if the user was in no groups
1990	this maps to a specific allow nothing entry for this user.
1991
1992	The common case from the NT ACL choser (userX deny all) is
1993	optimised so we don't do the group lookup - we just map to
1994	an allow nothing entry.
1995
1996	What we're doing here is inferring the allow permissions the
1997	person setting the ACE on user1 wanted by looking at the allow
1998	permissions on the groups the user is currently in. This will
1999	be a snapshot, depending on group membership but is the best
2000	we can do and has the advantage of failing closed rather than
2001	open.
2002	---------------------------------------------------------------------------
2003	Third pass - only deal with deny group entries.
2004
2005	DENY group1 (perms XXX)
2006
2007	for all following allow user entries where user is in group1
2008	user entry perms = user entry perms & ~ XXX;
2009
2010	If there is a group Everyone allow entry with permissions YYY,
2011	convert the group1 entry to an allow entry and modify its
2012	permissions to be :
2013
2014	new_perms = YYY & ~ XXX
2015
2016	and push to the end of the list.
2017
2018	If there is no group Everyone allow entry then convert the
2019	group1 entry to a allow nothing entry and push to the end of the list.
2020
2021	Note that the common case from the NT ACL choser (groupX deny all)
2022	cannot be optimised here as we need to modify user entries who are
2023	in the group to change them to a deny all also.
2024
2025	What we're doing here is modifying the allow permissions of
2026	user entries (which are more specific in POSIX ACLs) to mask
2027	out the explicit deny set on the group they are in. This will
2028	be a snapshot depending on current group membership but is the
2029	best we can do and has the advantage of failing closed rather
2030	than open.
2031	---------------------------------------------------------------------------
2032	Fourth pass - cope with cumulative permissions.
2033
2034	for all allow user entries, if there exists an allow group entry with
2035	more permissive permissions, and the user is in that group, rewrite the
2036	allow user permissions to contain both sets of permissions.
2037
2038	Currently the code for this is #ifdef'ed out as these semantics make
2039	no sense to me. JRA.
2040	---------------------------------------------------------------------------
2041
2042	Note we MUST do the deny user pass first as this will convert deny user
2043	entries into allow user entries which can then be processed by the deny
2044	group pass.
2045
2046	The above algorithm took a lot of thinking about - hence this
2047	explaination :-). JRA.
2048	****************************************************************************/
2049
2050	/****************************************************************************
2051	Process a canon_ace list entries. This is very complex code. We need
2052	to go through and remove the "deny" permissions from any allow entry that matches
2053	the id of this entry. We have already refused any NT ACL that wasn't in correct
2054	order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2055	we just remove it (to fail safe). We have already removed any duplicate ace
2056	entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2057	allow entries.
2058	****************************************************************************/
2059
2060	static void process_deny_list( canon_ace **pp_ace_list )
2061	{
2062	canon_ace ace_list = pp_ace_list;
2063	canon_ace *curr_ace = NULL;
2064	canon_ace *curr_ace_next = NULL;
2065
2066	/* Pass 1 above - look for an Everyone, deny entry. */
2067
2068	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2069	canon_ace *allow_ace_p;
2070
2071	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2072
2073	if (curr_ace->attr != DENY_ACE)
2074	continue;
2075
2076	if (curr_ace->perms == (mode_t)0) {
2077
2078	/* Deny nothing entry - delete. */
2079
2080	DLIST_REMOVE(ace_list, curr_ace);
2081	continue;
2082	}
2083
2084	if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2085	continue;
2086
2087	/* JRATEST - assert. */
2088	SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2089
2090	if (curr_ace->perms == ALL_ACE_PERMS) {
2091
2092	/*
2093	* Optimisation. This is a DENY_ALL to Everyone. Truncate the
2094	* list at this point including this entry.
2095	*/
2096
2097	canon_ace *prev_entry = curr_ace->prev;
2098
2099	free_canon_ace_list( curr_ace );
2100	if (prev_entry)
2101	prev_entry->next = NULL;
2102	else {
2103	/* We deleted the entire list. */
2104	ace_list = NULL;
2105	}
2106	break;
2107	}
2108
2109	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2110
2111	/*
2112	* Only mask off allow entries.
2113	*/
2114
2115	if (allow_ace_p->attr != ALLOW_ACE)
2116	continue;
2117
2118	allow_ace_p->perms &= ~curr_ace->perms;
2119	}
2120
2121	/*
2122	* Now it's been applied, remove it.
2123	*/
2124
2125	DLIST_REMOVE(ace_list, curr_ace);
2126	}
2127
2128	/* Pass 2 above - deal with deny user entries. */
2129
2130	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2131	mode_t new_perms = (mode_t)0;
2132	canon_ace *allow_ace_p;
2133
2134	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2135
2136	if (curr_ace->attr != DENY_ACE)
2137	continue;
2138
2139	if (curr_ace->owner_type != UID_ACE)
2140	continue;
2141
2142	if (curr_ace->perms == ALL_ACE_PERMS) {
2143
2144	/*
2145	* Optimisation - this is a deny everything to this user.
2146	* Convert to an allow nothing and push to the end of the list.
2147	*/
2148
2149	curr_ace->attr = ALLOW_ACE;
2150	curr_ace->perms = (mode_t)0;
2151	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2152	continue;
2153	}
2154
2155	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2156
2157	if (allow_ace_p->attr != ALLOW_ACE)
2158	continue;
2159
2160	/* We process GID_ACE and WORLD_ACE entries only. */
2161
2162	if (allow_ace_p->owner_type == UID_ACE)
2163	continue;
2164
2165	if (uid_entry_in_group( curr_ace, allow_ace_p))
2166	new_perms \|= allow_ace_p->perms;
2167	}
2168
2169	/*
2170	* Convert to a allow entry, modify the perms and push to the end
2171	* of the list.
2172	*/
2173
2174	curr_ace->attr = ALLOW_ACE;
2175	curr_ace->perms = (new_perms & ~curr_ace->perms);
2176	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2177	}
2178
2179	/* Pass 3 above - deal with deny group entries. */
2180
2181	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2182	canon_ace *allow_ace_p;
2183	canon_ace *allow_everyone_p = NULL;
2184
2185	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2186
2187	if (curr_ace->attr != DENY_ACE)
2188	continue;
2189
2190	if (curr_ace->owner_type != GID_ACE)
2191	continue;
2192
2193	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2194
2195	if (allow_ace_p->attr != ALLOW_ACE)
2196	continue;
2197
2198	/* Store a pointer to the Everyone allow, if it exists. */
2199	if (allow_ace_p->owner_type == WORLD_ACE)
2200	allow_everyone_p = allow_ace_p;
2201
2202	/* We process UID_ACE entries only. */
2203
2204	if (allow_ace_p->owner_type != UID_ACE)
2205	continue;
2206
2207	/* Mask off the deny group perms. */
2208
2209	if (uid_entry_in_group( allow_ace_p, curr_ace))
2210	allow_ace_p->perms &= ~curr_ace->perms;
2211	}
2212
2213	/*
2214	* Convert the deny to an allow with the correct perms and
2215	* push to the end of the list.
2216	*/
2217
2218	curr_ace->attr = ALLOW_ACE;
2219	if (allow_everyone_p)
2220	curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2221	else
2222	curr_ace->perms = (mode_t)0;
2223	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2224	}
2225
2226	/* Doing this fourth pass allows Windows semantics to be layered
2227	* on top of POSIX semantics. I'm not sure if this is desirable.
2228	* For example, in W2K ACLs there is no way to say, "Group X no
2229	* access, user Y full access" if user Y is a member of group X.
2230	* This seems completely broken semantics to me.... JRA.
2231	*/
2232
2233	#if 0
2234	/* Pass 4 above - deal with allow entries. */
2235
2236	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2237	canon_ace *allow_ace_p;
2238
2239	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2240
2241	if (curr_ace->attr != ALLOW_ACE)
2242	continue;
2243
2244	if (curr_ace->owner_type != UID_ACE)
2245	continue;
2246
2247	for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2248
2249	if (allow_ace_p->attr != ALLOW_ACE)
2250	continue;
2251
2252	/* We process GID_ACE entries only. */
2253
2254	if (allow_ace_p->owner_type != GID_ACE)
2255	continue;
2256
2257	/* OR in the group perms. */
2258
2259	if (uid_entry_in_group( curr_ace, allow_ace_p))
2260	curr_ace->perms \|= allow_ace_p->perms;
2261	}
2262	}
2263	#endif
2264
2265	*pp_ace_list = ace_list;
2266	}
2267
2268	/****************************************************************************
2269	Create a default mode that will be used if a security descriptor entry has
2270	no user/group/world entries.
2271	****************************************************************************/
2272
2273	static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2274	{
2275	int snum = SNUM(fsp->conn);
2276	mode_t and_bits = (mode_t)0;
2277	mode_t or_bits = (mode_t)0;
2278	mode_t mode;
2279
2280	if (interitable_mode) {
2281	mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2282	fsp->fsp_name, NULL);
2283	} else {
2284	mode = S_IRUSR;
2285	}
2286
2287	if (fsp->is_directory)
2288	mode \|= (S_IWUSR\|S_IXUSR);
2289
2290	/*
2291	* Now AND with the create mode/directory mode bits then OR with the
2292	* force create mode/force directory mode bits.
2293	*/
2294
2295	if (fsp->is_directory) {
2296	and_bits = lp_dir_security_mask(snum);
2297	or_bits = lp_force_dir_security_mode(snum);
2298	} else {
2299	and_bits = lp_security_mask(snum);
2300	or_bits = lp_force_security_mode(snum);
2301	}
2302
2303	return ((mode & and_bits)\|or_bits);
2304	}
2305
2306	/****************************************************************************
2307	Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2308	succeeding.
2309	****************************************************************************/
2310
2311	static bool unpack_canon_ace(files_struct *fsp,
2312	const SMB_STRUCT_STAT *pst,
2313	DOM_SID *pfile_owner_sid,
2314	DOM_SID *pfile_grp_sid,
2315	canon_ace **ppfile_ace,
2316	canon_ace **ppdir_ace,
2317	uint32 security_info_sent,
2318	const SEC_DESC *psd)
2319	{
2320	SMB_STRUCT_STAT st;
2321	canon_ace *file_ace = NULL;
2322	canon_ace *dir_ace = NULL;
2323
2324	*ppfile_ace = NULL;
2325	*ppdir_ace = NULL;
2326
2327	if(security_info_sent == 0) {
2328	DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2329	return False;
2330	}
2331
2332	/*
2333	* If no DACL then this is a chown only security descriptor.
2334	*/
2335
2336	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| !psd->dacl)
2337	return True;
2338
2339	/*
2340	* Now go through the DACL and create the canon_ace lists.
2341	*/
2342
2343	if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2344	&file_ace, &dir_ace, psd->dacl))
2345	return False;
2346
2347	if ((file_ace == NULL) && (dir_ace == NULL)) {
2348	/* W2K traverse DACL set - ignore. */
2349	return True;
2350	}
2351
2352	/*
2353	* Go through the canon_ace list and merge entries
2354	* belonging to identical users of identical allow or deny type.
2355	* We can do this as all deny entries come first, followed by
2356	* all allow entries (we have mandated this before accepting this acl).
2357	*/
2358
2359	print_canon_ace_list( "file ace - before merge", file_ace);
2360	merge_aces( &file_ace, false);
2361
2362	print_canon_ace_list( "dir ace - before merge", dir_ace);
2363	merge_aces( &dir_ace, true);
2364
2365	/*
2366	* NT ACLs are order dependent. Go through the acl lists and
2367	* process DENY entries by masking the allow entries.
2368	*/
2369
2370	print_canon_ace_list( "file ace - before deny", file_ace);
2371	process_deny_list( &file_ace);
2372
2373	print_canon_ace_list( "dir ace - before deny", dir_ace);
2374	process_deny_list( &dir_ace);
2375
2376	/*
2377	* A well formed POSIX file or default ACL has at least 3 entries, a
2378	* SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2379	* and optionally a mask entry. Ensure this is the case.
2380	*/
2381
2382	print_canon_ace_list( "file ace - before valid", file_ace);
2383
2384	st = *pst;
2385
2386	/*
2387	* A default 3 element mode entry for a file should be r-- --- ---.
2388	* A default 3 element mode entry for a directory should be rwx --- ---.
2389	*/
2390
2391	st.st_ex_mode = create_default_mode(fsp, False);
2392
2393	if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2394	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2395	free_canon_ace_list(file_ace);
2396	free_canon_ace_list(dir_ace);
2397	return False;
2398	}
2399
2400	print_canon_ace_list( "dir ace - before valid", dir_ace);
2401
2402	/*
2403	* A default inheritable 3 element mode entry for a directory should be the
2404	* mode Samba will use to create a file within. Ensure user rwx bits are set if
2405	* it's a directory.
2406	*/
2407
2408	st.st_ex_mode = create_default_mode(fsp, True);
2409
2410	if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2411	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2412	free_canon_ace_list(file_ace);
2413	free_canon_ace_list(dir_ace);
2414	return False;
2415	}
2416
2417	print_canon_ace_list( "file ace - return", file_ace);
2418	print_canon_ace_list( "dir ace - return", dir_ace);
2419
2420	*ppfile_ace = file_ace;
2421	*ppdir_ace = dir_ace;
2422	return True;
2423
2424	}
2425
2426	/******************************************************************************
2427	When returning permissions, try and fit NT display
2428	semantics if possible. Note the the canon_entries here must have been malloced.
2429	The list format should be - first entry = owner, followed by group and other user
2430	entries, last entry = other.
2431
2432	Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2433	are not ordered, and match on the most specific entry rather than walking a list,
2434	then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2435
2436	Entry 0: owner : deny all except read and write.
2437	Entry 1: owner : allow read and write.
2438	Entry 2: group : deny all except read.
2439	Entry 3: group : allow read.
2440	Entry 4: Everyone : allow read.
2441
2442	But NT cannot display this in their ACL editor !
2443	********************************************************************************/
2444
2445	static void arrange_posix_perms(const char filename, canon_ace *pp_list_head)
2446	{
2447	canon_ace l_head = pp_list_head;
2448	canon_ace *owner_ace = NULL;
2449	canon_ace *other_ace = NULL;
2450	canon_ace *ace = NULL;
2451
2452	for (ace = l_head; ace; ace = ace->next) {
2453	if (ace->type == SMB_ACL_USER_OBJ)
2454	owner_ace = ace;
2455	else if (ace->type == SMB_ACL_OTHER) {
2456	/* Last ace - this is "other" */
2457	other_ace = ace;
2458	}
2459	}
2460
2461	if (!owner_ace \|\| !other_ace) {
2462	DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2463	filename ));
2464	return;
2465	}
2466
2467	/*
2468	* The POSIX algorithm applies to owner first, and other last,
2469	* so ensure they are arranged in this order.
2470	*/
2471
2472	if (owner_ace) {
2473	DLIST_PROMOTE(l_head, owner_ace);
2474	}
2475
2476	if (other_ace) {
2477	DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2478	}
2479
2480	/* We have probably changed the head of the list. */
2481
2482	*pp_list_head = l_head;
2483	}
2484
2485	/****************************************************************************
2486	Create a linked list of canonical ACE entries.
2487	****************************************************************************/
2488
2489	static canon_ace canonicalise_acl(struct connection_struct conn,
2490	const char *fname, SMB_ACL_T posix_acl,
2491	const SMB_STRUCT_STAT *psbuf,
2492	const DOM_SID powner, const DOM_SID pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2493	{
2494	mode_t acl_mask = (S_IRUSR\|S_IWUSR\|S_IXUSR);
2495	canon_ace *l_head = NULL;
2496	canon_ace *ace = NULL;
2497	canon_ace *next_ace = NULL;
2498	int entry_id = SMB_ACL_FIRST_ENTRY;
2499	SMB_ACL_ENTRY_T entry;
2500	size_t ace_count;
2501
2502	while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2503	SMB_ACL_TAG_T tagtype;
2504	SMB_ACL_PERMSET_T permset;
2505	DOM_SID sid;
2506	posix_id unix_ug;
2507	enum ace_owner owner_type;
2508
2509	entry_id = SMB_ACL_NEXT_ENTRY;
2510
2511	/* Is this a MASK entry ? */
2512	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2513	continue;
2514
2515	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2516	continue;
2517
2518	/* Decide which SID to use based on the ACL type. */
2519	switch(tagtype) {
2520	case SMB_ACL_USER_OBJ:
2521	/* Get the SID from the owner. */
2522	sid_copy(&sid, powner);
2523	unix_ug.uid = psbuf->st_ex_uid;
2524	owner_type = UID_ACE;
2525	break;
2526	case SMB_ACL_USER:
2527	{
2528	uid_t puid = (uid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2529	if (puid == NULL) {
2530	DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2531	continue;
2532	}
2533	uid_to_sid( &sid, *puid);
2534	unix_ug.uid = *puid;
2535	owner_type = UID_ACE;
2536	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2537	break;
2538	}
2539	case SMB_ACL_GROUP_OBJ:
2540	/* Get the SID from the owning group. */
2541	sid_copy(&sid, pgroup);
2542	unix_ug.gid = psbuf->st_ex_gid;
2543	owner_type = GID_ACE;
2544	break;
2545	case SMB_ACL_GROUP:
2546	{
2547	gid_t pgid = (gid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2548	if (pgid == NULL) {
2549	DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2550	continue;
2551	}
2552	gid_to_sid( &sid, *pgid);
2553	unix_ug.gid = *pgid;
2554	owner_type = GID_ACE;
2555	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2556	break;
2557	}
2558	case SMB_ACL_MASK:
2559	acl_mask = convert_permset_to_mode_t(conn, permset);
2560	continue; /* Don't count the mask as an entry. */
2561	case SMB_ACL_OTHER:
2562	/* Use the Everyone SID */
2563	sid = global_sid_World;
2564	unix_ug.world = -1;
2565	owner_type = WORLD_ACE;
2566	break;
2567	default:
2568	DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2569	continue;
2570	}
2571
2572	/*
2573	* Add this entry to the list.
2574	*/
2575
2576	if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2577	goto fail;
2578
2579	ZERO_STRUCTP(ace);
2580	ace->type = tagtype;
2581	ace->perms = convert_permset_to_mode_t(conn, permset);
2582	ace->attr = ALLOW_ACE;
2583	ace->trustee = sid;
2584	ace->unix_ug = unix_ug;
2585	ace->owner_type = owner_type;
2586	ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2587
2588	DLIST_ADD(l_head, ace);
2589	}
2590
2591	/*
2592	* This next call will ensure we have at least a user/group/world set.
2593	*/
2594
2595	if (!ensure_canon_entry_valid(&l_head, conn->params,
2596	S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2597	psbuf, False))
2598	goto fail;
2599
2600	/*
2601	* Now go through the list, masking the permissions with the
2602	* acl_mask. Ensure all DENY Entries are at the start of the list.
2603	*/
2604
2605	DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2606
2607	for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2608	next_ace = ace->next;
2609
2610	/* Masks are only applied to entries other than USER_OBJ and OTHER. */
2611	if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2612	ace->perms &= acl_mask;
2613
2614	if (ace->perms == 0) {
2615	DLIST_PROMOTE(l_head, ace);
2616	}
2617
2618	if( DEBUGLVL( 10 ) ) {
2619	print_canon_ace(ace, ace_count);
2620	}
2621	}
2622
2623	arrange_posix_perms(fname,&l_head );
2624
2625	print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2626
2627	return l_head;
2628
2629	fail:
2630
2631	free_canon_ace_list(l_head);
2632	return NULL;
2633	}
2634
2635	/****************************************************************************
2636	Check if the current user group list contains a given group.
2637	****************************************************************************/
2638
2639	static bool current_user_in_group(gid_t gid)
2640	{
2641	int i;
2642
2643	for (i = 0; i < current_user.ut.ngroups; i++) {
2644	if (current_user.ut.groups[i] == gid) {
2645	return True;
2646	}
2647	}
2648
2649	return False;
2650	}
2651
2652	/****************************************************************************
2653	Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2654	****************************************************************************/
2655
2656	static bool acl_group_override(connection_struct *conn,
2657	const struct smb_filename *smb_fname)
2658	{
2659	if ((errno != EPERM) && (errno != EACCES)) {
2660	return false;
2661	}
2662
2663	/* file primary group == user primary or supplementary group */
2664	if (lp_acl_group_control(SNUM(conn)) &&
2665	current_user_in_group(smb_fname->st.st_ex_gid)) {
2666	return true;
2667	}
2668
2669	/* user has writeable permission */
2670	if (lp_dos_filemode(SNUM(conn)) &&
2671	can_write_to_file(conn, smb_fname)) {
2672	return true;
2673	}
2674
2675	return false;
2676	}
2677
2678	/****************************************************************************
2679	Attempt to apply an ACL to a file or directory.
2680	****************************************************************************/
2681
2682	static bool set_canon_ace_list(files_struct *fsp,
2683	canon_ace *the_ace,
2684	bool default_ace,
2685	const SMB_STRUCT_STAT *psbuf,
2686	bool *pacl_set_support)
2687	{
2688	connection_struct *conn = fsp->conn;
2689	bool ret = False;
2690	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2691	canon_ace *p_ace;
2692	int i;
2693	SMB_ACL_ENTRY_T mask_entry;
2694	bool got_mask_entry = False;
2695	SMB_ACL_PERMSET_T mask_permset;
2696	SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2697	bool needs_mask = False;
2698	mode_t mask_perms = 0;
2699
2700	/* Use the psbuf that was passed in. */
2701	fsp->fsp_name->st = *psbuf;
2702
2703	#if defined(POSIX_ACL_NEEDS_MASK)
2704	/* HP-UX always wants to have a mask (called "class" there). */
2705	needs_mask = True;
2706	#endif
2707
2708	if (the_acl == NULL) {
2709
2710	if (!no_acl_syscall_error(errno)) {
2711	/*
2712	* Only print this error message if we have some kind of ACL
2713	* support that's not working. Otherwise we would always get this.
2714	*/
2715	DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2716	default_ace ? "default" : "file", strerror(errno) ));
2717	}
2718	*pacl_set_support = False;
2719	goto fail;
2720	}
2721
2722	if( DEBUGLVL( 10 )) {
2723	dbgtext("set_canon_ace_list: setting ACL:\n");
2724	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2725	print_canon_ace( p_ace, i);
2726	}
2727	}
2728
2729	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2730	SMB_ACL_ENTRY_T the_entry;
2731	SMB_ACL_PERMSET_T the_permset;
2732
2733	/*
2734	* ACLs only "need" an ACL_MASK entry if there are any named user or
2735	* named group entries. But if there is an ACL_MASK entry, it applies
2736	* to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2737	* so that it doesn't deny (i.e., mask off) any permissions.
2738	*/
2739
2740	if (p_ace->type == SMB_ACL_USER \|\| p_ace->type == SMB_ACL_GROUP) {
2741	needs_mask = True;
2742	mask_perms \|= p_ace->perms;
2743	} else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2744	mask_perms \|= p_ace->perms;
2745	}
2746
2747	/*
2748	* Get the entry for this ACE.
2749	*/
2750
2751	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2752	DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2753	i, strerror(errno) ));
2754	goto fail;
2755	}
2756
2757	if (p_ace->type == SMB_ACL_MASK) {
2758	mask_entry = the_entry;
2759	got_mask_entry = True;
2760	}
2761
2762	/*
2763	* Ok - we now know the ACL calls should be working, don't
2764	* allow fallback to chmod.
2765	*/
2766
2767	*pacl_set_support = True;
2768
2769	/*
2770	* Initialise the entry from the canon_ace.
2771	*/
2772
2773	/*
2774	* First tell the entry what type of ACE this is.
2775	*/
2776
2777	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2778	DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2779	i, strerror(errno) ));
2780	goto fail;
2781	}
2782
2783	/*
2784	* Only set the qualifier (user or group id) if the entry is a user
2785	* or group id ACE.
2786	*/
2787
2788	if ((p_ace->type == SMB_ACL_USER) \|\| (p_ace->type == SMB_ACL_GROUP)) {
2789	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2790	DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2791	i, strerror(errno) ));
2792	goto fail;
2793	}
2794	}
2795
2796	/*
2797	* Convert the mode_t perms in the canon_ace to a POSIX permset.
2798	*/
2799
2800	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2801	DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2802	i, strerror(errno) ));
2803	goto fail;
2804	}
2805
2806	if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2807	DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2808	(unsigned int)p_ace->perms, i, strerror(errno) ));
2809	goto fail;
2810	}
2811
2812	/*
2813	* ..and apply them to the entry.
2814	*/
2815
2816	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2817	DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2818	i, strerror(errno) ));
2819	goto fail;
2820	}
2821
2822	if( DEBUGLVL( 10 ))
2823	print_canon_ace( p_ace, i);
2824
2825	}
2826
2827	if (needs_mask && !got_mask_entry) {
2828	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2829	DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2830	goto fail;
2831	}
2832
2833	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2834	DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2835	goto fail;
2836	}
2837
2838	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2839	DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2840	goto fail;
2841	}
2842
2843	if (map_acl_perms_to_permset(conn, S_IRUSR\|S_IWUSR\|S_IXUSR, &mask_permset) == -1) {
2844	DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2845	goto fail;
2846	}
2847
2848	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2849	DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2850	goto fail;
2851	}
2852	}
2853
2854	/*
2855	* Finally apply it to the file or directory.
2856	*/
2857
2858	if(default_ace \|\| fsp->is_directory \|\| fsp->fh->fd == -1) {
2859	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2860	the_acl_type, the_acl) == -1) {
2861	/*
2862	* Some systems allow all the above calls and only fail with no ACL support
2863	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2864	*/
2865	if (no_acl_syscall_error(errno)) {
2866	*pacl_set_support = False;
2867	}
2868
2869	if (acl_group_override(conn, fsp->fsp_name)) {
2870	int sret;
2871
2872	DEBUG(5,("set_canon_ace_list: acl group "
2873	"control on and current user in file "
2874	"%s primary group.\n",
2875	fsp_str_dbg(fsp)));
2876
2877	become_root();
2878	sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2879	fsp->fsp_name->base_name, the_acl_type,
2880	the_acl);
2881	unbecome_root();
2882	if (sret == 0) {
2883	ret = True;
2884	}
2885	}
2886
2887	if (ret == False) {
2888	DEBUG(2,("set_canon_ace_list: "
2889	"sys_acl_set_file type %s failed for "
2890	"file %s (%s).\n",
2891	the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2892	"directory default" : "file",
2893	fsp_str_dbg(fsp), strerror(errno)));
2894	goto fail;
2895	}
2896	}
2897	} else {
2898	if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2899	/*
2900	* Some systems allow all the above calls and only fail with no ACL support
2901	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2902	*/
2903	if (no_acl_syscall_error(errno)) {
2904	*pacl_set_support = False;
2905	}
2906
2907	if (acl_group_override(conn, fsp->fsp_name)) {
2908	int sret;
2909
2910	DEBUG(5,("set_canon_ace_list: acl group "
2911	"control on and current user in file "
2912	"%s primary group.\n",
2913	fsp_str_dbg(fsp)));
2914
2915	become_root();
2916	sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2917	unbecome_root();
2918	if (sret == 0) {
2919	ret = True;
2920	}
2921	}
2922
2923	if (ret == False) {
2924	DEBUG(2,("set_canon_ace_list: "
2925	"sys_acl_set_file failed for file %s "
2926	"(%s).\n",
2927	fsp_str_dbg(fsp), strerror(errno)));
2928	goto fail;
2929	}
2930	}
2931	}
2932
2933	ret = True;
2934
2935	fail:
2936
2937	if (the_acl != NULL) {
2938	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2939	}
2940
2941	return ret;
2942	}
2943
2944	/****************************************************************************
2945	Find a particular canon_ace entry.
2946	****************************************************************************/
2947
2948	static struct canon_ace canon_ace_entry_for(struct canon_ace list, SMB_ACL_TAG_T type, posix_id *id)
2949	{
2950	while (list) {
2951	if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) \|\|
2952	(type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) \|\|
2953	(type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2954	break;
2955	list = list->next;
2956	}
2957	return list;
2958	}
2959
2960	/****************************************************************************
2961
2962	****************************************************************************/
2963
2964	SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2965	{
2966	SMB_ACL_ENTRY_T entry;
2967
2968	if (!the_acl)
2969	return NULL;
2970	if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2971	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2972	return NULL;
2973	}
2974	return the_acl;
2975	}
2976
2977	/****************************************************************************
2978	Convert a canon_ace to a generic 3 element permission - if possible.
2979	****************************************************************************/
2980
2981	#define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2982
2983	static bool convert_canon_ace_to_posix_perms( files_struct fsp, canon_ace file_ace_list, mode_t *posix_perms)
2984	{
2985	int snum = SNUM(fsp->conn);
2986	size_t ace_count = count_canon_ace_list(file_ace_list);
2987	canon_ace *ace_p;
2988	canon_ace *owner_ace = NULL;
2989	canon_ace *group_ace = NULL;
2990	canon_ace *other_ace = NULL;
2991	mode_t and_bits;
2992	mode_t or_bits;
2993
2994	if (ace_count != 3) {
2995	DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2996	"entries for file %s to convert to posix perms.\n",
2997	fsp_str_dbg(fsp)));
2998	return False;
2999	}
3000
3001	for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3002	if (ace_p->owner_type == UID_ACE)
3003	owner_ace = ace_p;
3004	else if (ace_p->owner_type == GID_ACE)
3005	group_ace = ace_p;
3006	else if (ace_p->owner_type == WORLD_ACE)
3007	other_ace = ace_p;
3008	}
3009
3010	if (!owner_ace \|\| !group_ace \|\| !other_ace) {
3011	DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3012	"standard entries for file %s.\n", fsp_str_dbg(fsp)));
3013	return False;
3014	}
3015
3016	*posix_perms = (mode_t)0;
3017
3018	*posix_perms \|= owner_ace->perms;
3019	*posix_perms \|= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3020	*posix_perms \|= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3021	*posix_perms \|= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3022	*posix_perms \|= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3023	*posix_perms \|= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3024	*posix_perms \|= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3025
3026	/* The owner must have at least read access. */
3027
3028	*posix_perms \|= S_IRUSR;
3029	if (fsp->is_directory)
3030	*posix_perms \|= (S_IWUSR\|S_IXUSR);
3031
3032	/* If requested apply the masks. */
3033
3034	/* Get the initial bits to apply. */
3035
3036	if (fsp->is_directory) {
3037	and_bits = lp_dir_security_mask(snum);
3038	or_bits = lp_force_dir_security_mode(snum);
3039	} else {
3040	and_bits = lp_security_mask(snum);
3041	or_bits = lp_force_security_mode(snum);
3042	}
3043
3044	posix_perms = (((posix_perms) & and_bits)\|or_bits);
3045
3046	DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3047	"to perm=0%o for file %s.\n", (int)owner_ace->perms,
3048	(int)group_ace->perms, (int)other_ace->perms,
3049	(int)*posix_perms, fsp_str_dbg(fsp)));
3050
3051	return True;
3052	}
3053
3054	/****************************************************************************
3055	Incoming NT ACLs on a directory can be split into a default POSIX acl (CI\|OI\|IO) and
3056	a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3057	with CI\|OI set so it is inherited and also applies to the directory.
3058	Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3059	****************************************************************************/
3060
3061	static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3062	{
3063	size_t i, j;
3064
3065	for (i = 0; i < num_aces; i++) {
3066	for (j = i+1; j < num_aces; j++) {
3067	uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3068	uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3069	bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3070	bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3071
3072	/* We know the lower number ACE's are file entries. */
3073	if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3074	(nt_ace_list[i].size == nt_ace_list[j].size) &&
3075	(nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3076	sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3077	(i_inh == j_inh) &&
3078	(i_flags_ni == 0) &&
3079	(j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT\|
3080	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3081	SEC_ACE_FLAG_INHERIT_ONLY))) {
3082	/*
3083	* W2K wants to have access allowed zero access ACE's
3084	* at the end of the list. If the mask is zero, merge
3085	* the non-inherited ACE onto the inherited ACE.
3086	*/
3087
3088	if (nt_ace_list[i].access_mask == 0) {
3089	nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3090	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3091	if (num_aces - i - 1 > 0)
3092	memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3093	sizeof(SEC_ACE));
3094
3095	DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3096	(unsigned int)i, (unsigned int)j ));
3097	} else {
3098	/*
3099	* These are identical except for the flags.
3100	* Merge the inherited ACE onto the non-inherited ACE.
3101	*/
3102
3103	nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3104	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3105	if (num_aces - j - 1 > 0)
3106	memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3107	sizeof(SEC_ACE));
3108
3109	DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3110	(unsigned int)j, (unsigned int)i ));
3111	}
3112	num_aces--;
3113	break;
3114	}
3115	}
3116	}
3117
3118	return num_aces;
3119	}
3120
3121	/*
3122	* Add or Replace ACE entry.
3123	* In some cases we need to add a specific ACE for compatibility reasons.
3124	* When doing that we must make sure we are not actually creating a duplicate
3125	* entry. So we need to search whether an ACE entry already exist and eventually
3126	* replacce the access mask, or add a completely new entry if none was found.
3127	*
3128	* This function assumes the array has enough space to add a new entry without
3129	* any reallocation of memory.
3130	*/
3131
3132	static void add_or_replace_ace(SEC_ACE nt_ace_list, size_t num_aces,
3133	const DOM_SID *sid, enum security_ace_type type,
3134	uint32_t mask, uint8_t flags)
3135	{
3136	int i;
3137
3138	/* first search for a duplicate */
3139	for (i = 0; i < *num_aces; i++) {
3140	if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3141	(nt_ace_list[i].flags == flags)) break;
3142	}
3143
3144	if (i < num_aces) { / found */
3145	nt_ace_list[i].type = type;
3146	nt_ace_list[i].access_mask = mask;
3147	DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3148	i, sid_string_dbg(sid), flags));
3149	return;
3150	}
3151
3152	/* not found, append it */
3153	init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3154	}
3155
3156
3157	/****************************************************************************
3158	Reply to query a security descriptor from an fsp. If it succeeds it allocates
3159	the space for the return elements and returns the size needed to return the
3160	security descriptor. This should be the only external function needed for
3161	the UNIX style get ACL.
3162	****************************************************************************/
3163
3164	static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3165	const char *name,
3166	const SMB_STRUCT_STAT *sbuf,
3167	struct pai_val *pal,
3168	SMB_ACL_T posix_acl,
3169	SMB_ACL_T def_acl,
3170	uint32_t security_info,
3171	SEC_DESC **ppdesc)
3172	{
3173	DOM_SID owner_sid;
3174	DOM_SID group_sid;
3175	size_t sd_size = 0;
3176	SEC_ACL *psa = NULL;
3177	size_t num_acls = 0;
3178	size_t num_def_acls = 0;
3179	size_t num_aces = 0;
3180	canon_ace *file_ace = NULL;
3181	canon_ace *dir_ace = NULL;
3182	SEC_ACE *nt_ace_list = NULL;
3183	size_t num_profile_acls = 0;
3184	DOM_SID orig_owner_sid;
3185	SEC_DESC *psd = NULL;
3186	int i;
3187
3188	/*
3189	* Get the owner, group and world SIDs.
3190	*/
3191
3192	create_file_sids(sbuf, &owner_sid, &group_sid);
3193
3194	if (lp_profile_acls(SNUM(conn))) {
3195	/* For WXP SP1 the owner must be administrators. */
3196	sid_copy(&orig_owner_sid, &owner_sid);
3197	sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3198	sid_copy(&group_sid, &global_sid_Builtin_Users);
3199	num_profile_acls = 3;
3200	}
3201
3202	if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3203
3204	/*
3205	* In the optimum case Creator Owner and Creator Group would be used for
3206	* the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3207	* would lead to usability problems under Windows: The Creator entries
3208	* are only available in browse lists of directories and not for files;
3209	* additionally the identity of the owning group couldn't be determined.
3210	* We therefore use those identities only for Default ACLs.
3211	*/
3212
3213	/* Create the canon_ace lists. */
3214	file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3215	&owner_sid, &group_sid, pal,
3216	SMB_ACL_TYPE_ACCESS);
3217
3218	/* We must have some ACLS. */
3219
3220	if (count_canon_ace_list(file_ace) == 0) {
3221	DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3222	goto done;
3223	}
3224
3225	if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3226	dir_ace = canonicalise_acl(conn, name, def_acl,
3227	sbuf,
3228	&global_sid_Creator_Owner,
3229	&global_sid_Creator_Group,
3230	pal, SMB_ACL_TYPE_DEFAULT);
3231	}
3232
3233	/*
3234	* Create the NT ACE list from the canonical ace lists.
3235	*/
3236
3237	{
3238	canon_ace *ace;
3239	enum security_ace_type nt_acl_type;
3240
3241	if (nt4_compatible_acls() && dir_ace) {
3242	/*
3243	* NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3244	* but no non-INHERIT_ONLY entry for one SID. So we only
3245	* remove entries from the Access ACL if the
3246	* corresponding Default ACL entries have also been
3247	* removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3248	* are exceptions. We can do nothing
3249	* intelligent if the Default ACL contains entries that
3250	* are not also contained in the Access ACL, so this
3251	* case will still fail under NT 4.
3252	*/
3253
3254	ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3255	if (ace && !ace->perms) {
3256	DLIST_REMOVE(dir_ace, ace);
3257	SAFE_FREE(ace);
3258
3259	ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3260	if (ace && !ace->perms) {
3261	DLIST_REMOVE(file_ace, ace);
3262	SAFE_FREE(ace);
3263	}
3264	}
3265
3266	/*
3267	* WinNT doesn't usually have Creator Group
3268	* in browse lists, so we send this entry to
3269	* WinNT even if it contains no relevant
3270	* permissions. Once we can add
3271	* Creator Group to browse lists we can
3272	* re-enable this.
3273	*/
3274
3275	#if 0
3276	ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3277	if (ace && !ace->perms) {
3278	DLIST_REMOVE(dir_ace, ace);
3279	SAFE_FREE(ace);
3280	}
3281	#endif
3282
3283	ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3284	if (ace && !ace->perms) {
3285	DLIST_REMOVE(file_ace, ace);
3286	SAFE_FREE(ace);
3287	}
3288	}
3289
3290	num_acls = count_canon_ace_list(file_ace);
3291	num_def_acls = count_canon_ace_list(dir_ace);
3292
3293	/* Allocate the ace list. */
3294	if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3295	DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3296	goto done;
3297	}
3298
3299	memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3300
3301	/*
3302	* Create the NT ACE list from the canonical ace lists.
3303	*/
3304
3305	for (ace = file_ace; ace != NULL; ace = ace->next) {
3306	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3307	&nt_acl_type,
3308	ace->perms,
3309	S_ISDIR(sbuf->st_ex_mode));
3310	init_sec_ace(&nt_ace_list[num_aces++],
3311	&ace->trustee,
3312	nt_acl_type,
3313	acc,
3314	ace->ace_flags);
3315	}
3316
3317	/* The User must have access to a profile share - even
3318	* if we can't map the SID. */
3319	if (lp_profile_acls(SNUM(conn))) {
3320	add_or_replace_ace(nt_ace_list, &num_aces,
3321	&global_sid_Builtin_Users,
3322	SEC_ACE_TYPE_ACCESS_ALLOWED,
3323	FILE_GENERIC_ALL, 0);
3324	}
3325
3326	for (ace = dir_ace; ace != NULL; ace = ace->next) {
3327	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3328	&nt_acl_type,
3329	ace->perms,
3330	S_ISDIR(sbuf->st_ex_mode));
3331	init_sec_ace(&nt_ace_list[num_aces++],
3332	&ace->trustee,
3333	nt_acl_type,
3334	acc,
3335	ace->ace_flags \|
3336	SEC_ACE_FLAG_OBJECT_INHERIT\|
3337	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3338	SEC_ACE_FLAG_INHERIT_ONLY);
3339	}
3340
3341	/* The User must have access to a profile share - even
3342	* if we can't map the SID. */
3343	if (lp_profile_acls(SNUM(conn))) {
3344	add_or_replace_ace(nt_ace_list, &num_aces,
3345	&global_sid_Builtin_Users,
3346	SEC_ACE_TYPE_ACCESS_ALLOWED,
3347	FILE_GENERIC_ALL,
3348	SEC_ACE_FLAG_OBJECT_INHERIT \|
3349	SEC_ACE_FLAG_CONTAINER_INHERIT \|
3350	SEC_ACE_FLAG_INHERIT_ONLY);
3351	}
3352
3353	/*
3354	* Merge POSIX default ACLs and normal ACLs into one NT ACE.
3355	* Win2K needs this to get the inheritance correct when replacing ACLs
3356	* on a directory tree. Based on work by Jim @ IBM.
3357	*/
3358
3359	num_aces = merge_default_aces(nt_ace_list, num_aces);
3360
3361	if (lp_profile_acls(SNUM(conn))) {
3362	for (i = 0; i < num_aces; i++) {
3363	if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3364	add_or_replace_ace(nt_ace_list, &num_aces,
3365	&orig_owner_sid,
3366	nt_ace_list[i].type,
3367	nt_ace_list[i].access_mask,
3368	nt_ace_list[i].flags);
3369	break;
3370	}
3371	}
3372	}
3373	}
3374
3375	if (num_aces) {
3376	if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3377	DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3378	goto done;
3379	}
3380	}
3381	} /* security_info & DACL_SECURITY_INFORMATION */
3382
3383	psd = make_standard_sec_desc( talloc_tos(),
3384	(security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3385	(security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3386	psa,
3387	&sd_size);
3388
3389	if(!psd) {
3390	DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3391	sd_size = 0;
3392	goto done;
3393	}
3394
3395	/*
3396	* Windows 2000: The DACL_PROTECTED flag in the security
3397	* descriptor marks the ACL as non-inheriting, i.e., no
3398	* ACEs from higher level directories propagate to this
3399	* ACL. In the POSIX ACL model permissions are only
3400	* inherited at file create time, so ACLs never contain
3401	* any ACEs that are inherited dynamically. The DACL_PROTECTED
3402	* flag doesn't seem to bother Windows NT.
3403	* Always set this if map acl inherit is turned off.
3404	*/
3405	if (pal == NULL \|\| !lp_map_acl_inherit(SNUM(conn))) {
3406	psd->type \|= SEC_DESC_DACL_PROTECTED;
3407	} else {
3408	psd->type \|= pal->sd_type;
3409	}
3410
3411	if (psd->dacl) {
3412	dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3413	}
3414
3415	*ppdesc = psd;
3416
3417	done:
3418
3419	if (posix_acl) {
3420	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3421	}
3422	if (def_acl) {
3423	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3424	}
3425	free_canon_ace_list(file_ace);
3426	free_canon_ace_list(dir_ace);
3427	free_inherited_info(pal);
3428	SAFE_FREE(nt_ace_list);
3429
3430	return NT_STATUS_OK;
3431	}
3432
3433	NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3434	SEC_DESC **ppdesc)
3435	{
3436	SMB_STRUCT_STAT sbuf;
3437	SMB_ACL_T posix_acl = NULL;
3438	struct pai_val *pal;
3439
3440	*ppdesc = NULL;
3441
3442	DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3443	fsp_str_dbg(fsp)));
3444
3445	/* can it happen that fsp_name == NULL ? */
3446	if (fsp->is_directory \|\| fsp->fh->fd == -1) {
3447	return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3448	security_info, ppdesc);
3449	}
3450
3451	/* Get the stat struct for the owner info. */
3452	if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3453	return map_nt_error_from_unix(errno);
3454	}
3455
3456	/* Get the ACL from the fd. */
3457	posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3458
3459	pal = fload_inherited_info(fsp);
3460
3461	return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3462	&sbuf, pal, posix_acl, NULL,
3463	security_info, ppdesc);
3464	}
3465
3466	NTSTATUS posix_get_nt_acl(struct connection_struct conn, const char name,
3467	uint32_t security_info, SEC_DESC **ppdesc)
3468	{
3469	SMB_ACL_T posix_acl = NULL;
3470	SMB_ACL_T def_acl = NULL;
3471	struct pai_val *pal;
3472	struct smb_filename smb_fname;
3473	int ret;
3474
3475	*ppdesc = NULL;
3476
3477	DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3478
3479	ZERO_STRUCT(smb_fname);
3480	smb_fname.base_name = discard_const_p(char, name);
3481
3482	/* Get the stat struct for the owner info. */
3483	if (lp_posix_pathnames()) {
3484	ret = SMB_VFS_LSTAT(conn, &smb_fname);
3485	} else {
3486	ret = SMB_VFS_STAT(conn, &smb_fname);
3487	}
3488
3489	if (ret == -1) {
3490	return map_nt_error_from_unix(errno);
3491	}
3492
3493	/* Get the ACL from the path. */
3494	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3495
3496	/* If it's a directory get the default POSIX ACL. */
3497	if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3498	def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3499	def_acl = free_empty_sys_acl(conn, def_acl);
3500	}
3501
3502	pal = load_inherited_info(conn, name);
3503
3504	return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3505	posix_acl, def_acl, security_info,
3506	ppdesc);
3507	}
3508
3509	/****************************************************************************
3510	Try to chown a file. We will be able to chown it under the following conditions.
3511
3512	1) If we have root privileges, then it will just work.
3513	2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3514	3) If we have SeRestorePrivilege we can change the user to any other user.
3515	4) If we have write permission to the file and dos_filemodes is set
3516	then allow chown to the currently authenticated user.
3517	****************************************************************************/
3518
3519	int try_chown(connection_struct conn, struct smb_filename smb_fname,
3520	uid_t uid, gid_t gid)
3521	{
3522	int ret;
3523	files_struct *fsp;
3524
3525	if(!CAN_WRITE(conn)) {
3526	return -1;
3527	}
3528
3529	/* Case (1). */
3530	/* try the direct way first */
3531	if (lp_posix_pathnames()) {
3532	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3533	} else {
3534	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3535	}
3536
3537	if (ret == 0)
3538	return 0;
3539
3540	/* Case (2) / (3) */
3541	if (lp_enable_privileges()) {
3542
3543	bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3544	&se_take_ownership);
3545	bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3546	&se_restore);
3547
3548	/* Case (2) */
3549	if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) \|\|
3550	/* Case (3) */
3551	( has_restore_priv ) ) {
3552
3553	become_root();
3554	/* Keep the current file gid the same - take ownership doesn't imply group change. */
3555	if (lp_posix_pathnames()) {
3556	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3557	(gid_t)-1);
3558	} else {
3559	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3560	(gid_t)-1);
3561	}
3562	unbecome_root();
3563	return ret;
3564	}
3565	}
3566
3567	/* Case (4). */
3568	if (!lp_dos_filemode(SNUM(conn))) {
3569	errno = EPERM;
3570	return -1;
3571	}
3572
3573	/* only allow chown to the current user. This is more secure,
3574	and also copes with the case where the SID in a take ownership ACL is
3575	a local SID on the users workstation
3576	*/
3577	if (uid != current_user.ut.uid) {
3578	errno = EPERM;
3579	return -1;
3580	}
3581
3582	if (lp_posix_pathnames()) {
3583	ret = SMB_VFS_LSTAT(conn, smb_fname);
3584	} else {
3585	ret = SMB_VFS_STAT(conn, smb_fname);
3586	}
3587
3588	if (ret == -1) {
3589	return -1;
3590	}
3591
3592	if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3593	return -1;
3594	}
3595
3596	become_root();
3597	/* Keep the current file gid the same. */
3598	if (fsp->fh->fd == -1) {
3599	if (lp_posix_pathnames()) {
3600	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3601	(gid_t)-1);
3602	} else {
3603	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3604	(gid_t)-1);
3605	}
3606	} else {
3607	ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3608	}
3609	unbecome_root();
3610
3611	close_file_fchmod(NULL, fsp);
3612
3613	return ret;
3614	}
3615
3616	#if 0
3617	/* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3618
3619	/****************************************************************************
3620	Take care of parent ACL inheritance.
3621	****************************************************************************/
3622
3623	NTSTATUS append_parent_acl(files_struct *fsp,
3624	const SEC_DESC *pcsd,
3625	SEC_DESC **pp_new_sd)
3626	{
3627	struct smb_filename *smb_dname = NULL;
3628	SEC_DESC *parent_sd = NULL;
3629	files_struct *parent_fsp = NULL;
3630	TALLOC_CTX *mem_ctx = talloc_tos();
3631	char *parent_name = NULL;
3632	SEC_ACE *new_ace = NULL;
3633	unsigned int num_aces = pcsd->dacl->num_aces;
3634	NTSTATUS status;
3635	int info;
3636	unsigned int i, j;
3637	SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3638	bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3639
3640	if (psd == NULL) {
3641	return NT_STATUS_NO_MEMORY;
3642	}
3643
3644	if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3645	NULL)) {
3646	return NT_STATUS_NO_MEMORY;
3647	}
3648
3649	status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3650	&smb_dname);
3651	if (!NT_STATUS_IS_OK(status)) {
3652	goto fail;
3653	}
3654
3655	status = SMB_VFS_CREATE_FILE(
3656	fsp->conn, /* conn */
3657	NULL, /* req */
3658	0, /* root_dir_fid */
3659	smb_dname, /* fname */
3660	FILE_READ_ATTRIBUTES, /* access_mask */
3661	FILE_SHARE_NONE, /* share_access */
3662	FILE_OPEN, /* create_disposition*/
3663	FILE_DIRECTORY_FILE, /* create_options */
3664	0, /* file_attributes */
3665	INTERNAL_OPEN_ONLY, /* oplock_request */
3666	0, /* allocation_size */
3667	NULL, /* sd */
3668	NULL, /* ea_list */
3669	&parent_fsp, /* result */
3670	&info); /* pinfo */
3671
3672	if (!NT_STATUS_IS_OK(status)) {
3673	TALLOC_FREE(smb_dname);
3674	return status;
3675	}
3676
3677	status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3678	DACL_SECURITY_INFORMATION, &parent_sd );
3679
3680	close_file(NULL, parent_fsp, NORMAL_CLOSE);
3681	TALLOC_FREE(smb_dname);
3682
3683	if (!NT_STATUS_IS_OK(status)) {
3684	return status;
3685	}
3686
3687	/*
3688	* Make room for potentially all the ACLs from
3689	* the parent. We used to add the ugw triple here,
3690	* as we knew we were dealing with POSIX ACLs.
3691	* We no longer need to do so as we can guarentee
3692	* that a default ACL from the parent directory will
3693	* be well formed for POSIX ACLs if it came from a
3694	* POSIX ACL source, and if we're not writing to a
3695	* POSIX ACL sink then we don't care if it's not well
3696	* formed. JRA.
3697	*/
3698
3699	num_aces += parent_sd->dacl->num_aces;
3700
3701	if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3702	num_aces)) == NULL) {
3703	return NT_STATUS_NO_MEMORY;
3704	}
3705
3706	/* Start by copying in all the given ACE entries. */
3707	for (i = 0; i < psd->dacl->num_aces; i++) {
3708	sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3709	}
3710
3711	/*
3712	* Note that we're ignoring "inherit permissions" here
3713	* as that really only applies to newly created files. JRA.
3714	*/
3715
3716	/* Finally append any inherited ACEs. */
3717	for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3718	SEC_ACE *se = &parent_sd->dacl->aces[j];
3719
3720	if (fsp->is_directory) {
3721	if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3722	/* Doesn't apply to a directory - ignore. */
3723	DEBUG(10,("append_parent_acl: directory %s "
3724	"ignoring non container "
3725	"inherit flags %u on ACE with sid %s "
3726	"from parent %s\n",
3727	fsp_str_dbg(fsp),
3728	(unsigned int)se->flags,
3729	sid_string_dbg(&se->trustee),
3730	parent_name));
3731	continue;
3732	}
3733	} else {
3734	if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3735	/* Doesn't apply to a file - ignore. */
3736	DEBUG(10,("append_parent_acl: file %s "
3737	"ignoring non object "
3738	"inherit flags %u on ACE with sid %s "
3739	"from parent %s\n",
3740	fsp_str_dbg(fsp),
3741	(unsigned int)se->flags,
3742	sid_string_dbg(&se->trustee),
3743	parent_name));
3744	continue;
3745	}
3746	}
3747
3748	if (is_dacl_protected) {
3749	/* If the DACL is protected it means we must
3750	* not overwrite an existing ACE entry with the
3751	* same SID. This is order N^2. Ouch :-(. JRA. */
3752	unsigned int k;
3753	for (k = 0; k < psd->dacl->num_aces; k++) {
3754	if (sid_equal(&psd->dacl->aces[k].trustee,
3755	&se->trustee)) {
3756	break;
3757	}
3758	}
3759	if (k < psd->dacl->num_aces) {
3760	/* SID matched. Ignore. */
3761	DEBUG(10,("append_parent_acl: path %s "
3762	"ignoring ACE with protected sid %s "
3763	"from parent %s\n",
3764	fsp_str_dbg(fsp),
3765	sid_string_dbg(&se->trustee),
3766	parent_name));
3767	continue;
3768	}
3769	}
3770
3771	sec_ace_copy(&new_ace[i], se);
3772	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3773	new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3774	}
3775	new_ace[i].flags \|= SEC_ACE_FLAG_INHERITED_ACE;
3776
3777	if (fsp->is_directory) {
3778	/*
3779	* Strip off any inherit only. It's applied.
3780	*/
3781	new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3782	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3783	/* No further inheritance. */
3784	new_ace[i].flags &=
3785	~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3786	SEC_ACE_FLAG_OBJECT_INHERIT);
3787	}
3788	} else {
3789	/*
3790	* Strip off any container or inherit
3791	* flags, they can't apply to objects.
3792	*/
3793	new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3794	SEC_ACE_FLAG_INHERIT_ONLY\|
3795	SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3796	}
3797	i++;
3798
3799	DEBUG(10,("append_parent_acl: path %s "
3800	"inheriting ACE with sid %s "
3801	"from parent %s\n",
3802	fsp_str_dbg(fsp),
3803	sid_string_dbg(&se->trustee),
3804	parent_name));
3805	}
3806
3807	psd->dacl->aces = new_ace;
3808	psd->dacl->num_aces = i;
3809	psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED\|
3810	SE_DESC_DACL_AUTO_INHERIT_REQ);
3811
3812	*pp_new_sd = psd;
3813	return status;
3814	}
3815	#endif
3816
3817	/****************************************************************************
3818	Reply to set a security descriptor on an fsp. security_info_sent is the
3819	description of the following NT ACL.
3820	This should be the only external function needed for the UNIX style set ACL.
3821	****************************************************************************/
3822
3823	NTSTATUS set_nt_acl(files_struct fsp, uint32 security_info_sent, const SEC_DESC psd)
3824	{
3825	connection_struct *conn = fsp->conn;
3826	uid_t user = (uid_t)-1;
3827	gid_t grp = (gid_t)-1;
3828	DOM_SID file_owner_sid;
3829	DOM_SID file_grp_sid;
3830	canon_ace *file_ace_list = NULL;
3831	canon_ace *dir_ace_list = NULL;
3832	bool acl_perms = False;
3833	mode_t orig_mode = (mode_t)0;
3834	NTSTATUS status;
3835	bool set_acl_as_root = false;
3836	bool acl_set_support = false;
3837	bool ret = false;
3838
3839	DEBUG(10,("set_nt_acl: called for file %s\n",
3840	fsp_str_dbg(fsp)));
3841
3842	if (!CAN_WRITE(conn)) {
3843	DEBUG(10,("set acl rejected on read-only share\n"));
3844	return NT_STATUS_MEDIA_WRITE_PROTECTED;
3845	}
3846
3847	/*
3848	* Get the current state of the file.
3849	*/
3850
3851	status = vfs_stat_fsp(fsp);
3852	if (!NT_STATUS_IS_OK(status)) {
3853	return status;
3854	}
3855
3856	/* Save the original element we check against. */
3857	orig_mode = fsp->fsp_name->st.st_ex_mode;
3858
3859	/*
3860	* Unpack the user/group/world id's.
3861	*/
3862
3863	status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3864	if (!NT_STATUS_IS_OK(status)) {
3865	return status;
3866	}
3867
3868	/*
3869	* Do we need to chown ? If so this must be done first as the incoming
3870	* CREATOR_OWNER acl will be relative to the new owner, not the old.
3871	* Noticed by Simo.
3872	*/
3873
3874	if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) \|\|
3875	(( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3876
3877	DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3878	fsp_str_dbg(fsp), (unsigned int)user,
3879	(unsigned int)grp));
3880
3881	if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3882	DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3883	"= %s.\n", fsp_str_dbg(fsp),
3884	(unsigned int)user, (unsigned int)grp,
3885	strerror(errno)));
3886	if (errno == EPERM) {
3887	return NT_STATUS_INVALID_OWNER;
3888	}
3889	return map_nt_error_from_unix(errno);
3890	}
3891
3892	/*
3893	* Recheck the current state of the file, which may have changed.
3894	* (suid/sgid bits, for instance)
3895	*/
3896
3897	status = vfs_stat_fsp(fsp);
3898	if (!NT_STATUS_IS_OK(status)) {
3899	return status;
3900	}
3901
3902	/* Save the original element we check against. */
3903	orig_mode = fsp->fsp_name->st.st_ex_mode;
3904
3905	/* If we successfully chowned, we know we must
3906	* be able to set the acl, so do it as root.
3907	*/
3908	set_acl_as_root = true;
3909	}
3910
3911	create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3912
3913	acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3914	&file_grp_sid, &file_ace_list,
3915	&dir_ace_list, security_info_sent, psd);
3916
3917	/* Ignore W2K traverse DACL set. */
3918	if (!file_ace_list && !dir_ace_list) {
3919	return NT_STATUS_OK;
3920	}
3921
3922	if (!acl_perms) {
3923	DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3924	free_canon_ace_list(file_ace_list);
3925	free_canon_ace_list(dir_ace_list);
3926	return NT_STATUS_ACCESS_DENIED;
3927	}
3928
3929	/*
3930	* Only change security if we got a DACL.
3931	*/
3932
3933	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| (psd->dacl == NULL)) {
3934	free_canon_ace_list(file_ace_list);
3935	free_canon_ace_list(dir_ace_list);
3936	return NT_STATUS_OK;
3937	}
3938
3939	/*
3940	* Try using the POSIX ACL set first. Fall back to chmod if
3941	* we have no ACL support on this filesystem.
3942	*/
3943
3944	if (acl_perms && file_ace_list) {
3945	if (set_acl_as_root) {
3946	become_root();
3947	}
3948	ret = set_canon_ace_list(fsp, file_ace_list, false,
3949	&fsp->fsp_name->st, &acl_set_support);
3950	if (set_acl_as_root) {
3951	unbecome_root();
3952	}
3953	if (acl_set_support && ret == false) {
3954	DEBUG(3,("set_nt_acl: failed to set file acl on file "
3955	"%s (%s).\n", fsp_str_dbg(fsp),
3956	strerror(errno)));
3957	free_canon_ace_list(file_ace_list);
3958	free_canon_ace_list(dir_ace_list);
3959	return map_nt_error_from_unix(errno);
3960	}
3961	}
3962
3963	if (acl_perms && acl_set_support && fsp->is_directory) {
3964	if (dir_ace_list) {
3965	if (set_acl_as_root) {
3966	become_root();
3967	}
3968	ret = set_canon_ace_list(fsp, dir_ace_list, true,
3969	&fsp->fsp_name->st,
3970	&acl_set_support);
3971	if (set_acl_as_root) {
3972	unbecome_root();
3973	}
3974	if (ret == false) {
3975	DEBUG(3,("set_nt_acl: failed to set default "
3976	"acl on directory %s (%s).\n",
3977	fsp_str_dbg(fsp), strerror(errno)));
3978	free_canon_ace_list(file_ace_list);
3979	free_canon_ace_list(dir_ace_list);
3980	return map_nt_error_from_unix(errno);
3981	}
3982	} else {
3983	int sret = -1;
3984
3985	/*
3986	* No default ACL - delete one if it exists.
3987	*/
3988
3989	if (set_acl_as_root) {
3990	become_root();
3991	}
3992	sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3993	fsp->fsp_name->base_name);
3994	if (set_acl_as_root) {
3995	unbecome_root();
3996	}
3997	if (sret == -1) {
3998	if (acl_group_override(conn, fsp->fsp_name)) {
3999	DEBUG(5,("set_nt_acl: acl group "
4000	"control on and current user "
4001	"in file %s primary group. "
4002	"Override delete_def_acl\n",
4003	fsp_str_dbg(fsp)));
4004
4005	become_root();
4006	sret =
4007	SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4008	conn,
4009	fsp->fsp_name->base_name);
4010	unbecome_root();
4011	}
4012
4013	if (sret == -1) {
4014	DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4015	free_canon_ace_list(file_ace_list);
4016	free_canon_ace_list(dir_ace_list);
4017	return map_nt_error_from_unix(errno);
4018	}
4019	}
4020	}
4021	}
4022
4023	if (acl_set_support) {
4024	if (set_acl_as_root) {
4025	become_root();
4026	}
4027	store_inheritance_attributes(fsp,
4028	file_ace_list,
4029	dir_ace_list,
4030	psd->type);
4031	if (set_acl_as_root) {
4032	unbecome_root();
4033	}
4034	}
4035
4036	/*
4037	* If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4038	*/
4039
4040	if(!acl_set_support && acl_perms) {
4041	mode_t posix_perms;
4042
4043	if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4044	free_canon_ace_list(file_ace_list);
4045	free_canon_ace_list(dir_ace_list);
4046	DEBUG(3,("set_nt_acl: failed to convert file acl to "
4047	"posix permissions for file %s.\n",
4048	fsp_str_dbg(fsp)));
4049	return NT_STATUS_ACCESS_DENIED;
4050	}
4051
4052	if (orig_mode != posix_perms) {
4053	int sret = -1;
4054
4055	DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4056	fsp_str_dbg(fsp), (unsigned int)posix_perms));
4057
4058	if (set_acl_as_root) {
4059	become_root();
4060	}
4061	sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4062	posix_perms);
4063	if (set_acl_as_root) {
4064	unbecome_root();
4065	}
4066	if(sret == -1) {
4067	if (acl_group_override(conn, fsp->fsp_name)) {
4068	DEBUG(5,("set_nt_acl: acl group "
4069	"control on and current user "
4070	"in file %s primary group. "
4071	"Override chmod\n",
4072	fsp_str_dbg(fsp)));
4073
4074	become_root();
4075	sret = SMB_VFS_CHMOD(conn,
4076	fsp->fsp_name->base_name,
4077	posix_perms);
4078	unbecome_root();
4079	}
4080
4081	if (sret == -1) {
4082	DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4083	"failed. Error = %s.\n",
4084	fsp_str_dbg(fsp),
4085	(unsigned int)posix_perms,
4086	strerror(errno)));
4087	free_canon_ace_list(file_ace_list);
4088	free_canon_ace_list(dir_ace_list);
4089	return map_nt_error_from_unix(errno);
4090	}
4091	}
4092	}
4093	}
4094
4095	free_canon_ace_list(file_ace_list);
4096	free_canon_ace_list(dir_ace_list);
4097
4098	/* Ensure the stat struct in the fsp is correct. */
4099	status = vfs_stat_fsp(fsp);
4100
4101	return NT_STATUS_OK;
4102	}
4103
4104	/****************************************************************************
4105	Get the actual group bits stored on a file with an ACL. Has no effect if
4106	the file has no ACL. Needed in dosmode code where the stat() will return
4107	the mask bits, not the real group bits, for a file with an ACL.
4108	****************************************************************************/
4109
4110	int get_acl_group_bits( connection_struct conn, const char fname, mode_t *mode )
4111	{
4112	int entry_id = SMB_ACL_FIRST_ENTRY;
4113	SMB_ACL_ENTRY_T entry;
4114	SMB_ACL_T posix_acl;
4115	int result = -1;
4116
4117	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4118	if (posix_acl == (SMB_ACL_T)NULL)
4119	return -1;
4120
4121	while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4122	SMB_ACL_TAG_T tagtype;
4123	SMB_ACL_PERMSET_T permset;
4124
4125	entry_id = SMB_ACL_NEXT_ENTRY;
4126
4127	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4128	break;
4129
4130	if (tagtype == SMB_ACL_GROUP_OBJ) {
4131	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4132	break;
4133	} else {
4134	*mode &= ~(S_IRGRP\|S_IWGRP\|S_IXGRP);
4135	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4136	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4137	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4138	result = 0;
4139	break;
4140	}
4141	}
4142	}
4143	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4144	return result;
4145	}
4146
4147	/****************************************************************************
4148	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4149	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4150	****************************************************************************/
4151
4152	static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4153	{
4154	int entry_id = SMB_ACL_FIRST_ENTRY;
4155	SMB_ACL_ENTRY_T entry;
4156	int num_entries = 0;
4157
4158	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4159	SMB_ACL_TAG_T tagtype;
4160	SMB_ACL_PERMSET_T permset;
4161	mode_t perms;
4162
4163	entry_id = SMB_ACL_NEXT_ENTRY;
4164
4165	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4166	return -1;
4167
4168	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4169	return -1;
4170
4171	num_entries++;
4172
4173	switch(tagtype) {
4174	case SMB_ACL_USER_OBJ:
4175	perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4176	break;
4177	case SMB_ACL_GROUP_OBJ:
4178	perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4179	break;
4180	case SMB_ACL_MASK:
4181	/*
4182	* FIXME: The ACL_MASK entry permissions should really be set to
4183	* the union of the permissions of all ACL_USER,
4184	* ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4185	* acl_calc_mask() does, but Samba ACLs doesn't provide it.
4186	*/
4187	perms = S_IRUSR\|S_IWUSR\|S_IXUSR;
4188	break;
4189	case SMB_ACL_OTHER:
4190	perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4191	break;
4192	default:
4193	continue;
4194	}
4195
4196	if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4197	return -1;
4198
4199	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4200	return -1;
4201	}
4202
4203	/*
4204	* If this is a simple 3 element ACL or no elements then it's a standard
4205	* UNIX permission set. Just use chmod...
4206	*/
4207
4208	if ((num_entries == 3) \|\| (num_entries == 0))
4209	return -1;
4210
4211	return 0;
4212	}
4213
4214	/****************************************************************************
4215	Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4216	GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4217	resulting ACL on TO. Note that name is in UNIX character set.
4218	****************************************************************************/
4219
4220	static int copy_access_posix_acl(connection_struct conn, const char from, const char *to, mode_t mode)
4221	{
4222	SMB_ACL_T posix_acl = NULL;
4223	int ret = -1;
4224
4225	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4226	return -1;
4227
4228	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4229	goto done;
4230
4231	ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4232
4233	done:
4234
4235	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4236	return ret;
4237	}
4238
4239	/****************************************************************************
4240	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4241	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4242	Note that name is in UNIX character set.
4243	****************************************************************************/
4244
4245	int chmod_acl(connection_struct conn, const char name, mode_t mode)
4246	{
4247	return copy_access_posix_acl(conn, name, name, mode);
4248	}
4249
4250	/****************************************************************************
4251	Check for an existing default POSIX ACL on a directory.
4252	****************************************************************************/
4253
4254	static bool directory_has_default_posix_acl(connection_struct conn, const char fname)
4255	{
4256	SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4257	bool has_acl = False;
4258	SMB_ACL_ENTRY_T entry;
4259
4260	if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4261	has_acl = True;
4262	}
4263
4264	if (def_acl) {
4265	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4266	}
4267	return has_acl;
4268	}
4269
4270	/****************************************************************************
4271	If the parent directory has no default ACL but it does have an Access ACL,
4272	inherit this Access ACL to file name.
4273	****************************************************************************/
4274
4275	int inherit_access_posix_acl(connection_struct conn, const char inherit_from_dir,
4276	const char *name, mode_t mode)
4277	{
4278	if (directory_has_default_posix_acl(conn, inherit_from_dir))
4279	return 0;
4280
4281	return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4282	}
4283
4284	/****************************************************************************
4285	Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4286	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4287	****************************************************************************/
4288
4289	int fchmod_acl(files_struct *fsp, mode_t mode)
4290	{
4291	connection_struct *conn = fsp->conn;
4292	SMB_ACL_T posix_acl = NULL;
4293	int ret = -1;
4294
4295	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4296	return -1;
4297
4298	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4299	goto done;
4300
4301	ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4302
4303	done:
4304
4305	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4306	return ret;
4307	}
4308
4309	/****************************************************************************
4310	Map from wire type to permset.
4311	****************************************************************************/
4312
4313	static bool unix_ex_wire_to_permset(connection_struct conn, unsigned char wire_perm, SMB_ACL_PERMSET_T p_permset)
4314	{
4315	if (wire_perm & ~(SMB_POSIX_ACL_READ\|SMB_POSIX_ACL_WRITE\|SMB_POSIX_ACL_EXECUTE)) {
4316	return False;
4317	}
4318
4319	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4320	return False;
4321	}
4322
4323	if (wire_perm & SMB_POSIX_ACL_READ) {
4324	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4325	return False;
4326	}
4327	}
4328	if (wire_perm & SMB_POSIX_ACL_WRITE) {
4329	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4330	return False;
4331	}
4332	}
4333	if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4334	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4335	return False;
4336	}
4337	}
4338	return True;
4339	}
4340
4341	/****************************************************************************
4342	Map from wire type to tagtype.
4343	****************************************************************************/
4344
4345	static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4346	{
4347	switch (wire_tt) {
4348	case SMB_POSIX_ACL_USER_OBJ:
4349	*p_tt = SMB_ACL_USER_OBJ;
4350	break;
4351	case SMB_POSIX_ACL_USER:
4352	*p_tt = SMB_ACL_USER;
4353	break;
4354	case SMB_POSIX_ACL_GROUP_OBJ:
4355	*p_tt = SMB_ACL_GROUP_OBJ;
4356	break;
4357	case SMB_POSIX_ACL_GROUP:
4358	*p_tt = SMB_ACL_GROUP;
4359	break;
4360	case SMB_POSIX_ACL_MASK:
4361	*p_tt = SMB_ACL_MASK;
4362	break;
4363	case SMB_POSIX_ACL_OTHER:
4364	*p_tt = SMB_ACL_OTHER;
4365	break;
4366	default:
4367	return False;
4368	}
4369	return True;
4370	}
4371
4372	/****************************************************************************
4373	Create a new POSIX acl from wire permissions.
4374	FIXME ! How does the share mask/mode fit into this.... ?
4375	****************************************************************************/
4376
4377	static SMB_ACL_T create_posix_acl_from_wire(connection_struct conn, uint16 num_acls, const char pdata)
4378	{
4379	unsigned int i;
4380	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4381
4382	if (the_acl == NULL) {
4383	return NULL;
4384	}
4385
4386	for (i = 0; i < num_acls; i++) {
4387	SMB_ACL_ENTRY_T the_entry;
4388	SMB_ACL_PERMSET_T the_permset;
4389	SMB_ACL_TAG_T tag_type;
4390
4391	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4392	DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4393	i, strerror(errno) ));
4394	goto fail;
4395	}
4396
4397	if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4398	DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4399	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4400	goto fail;
4401	}
4402
4403	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4404	DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4405	i, strerror(errno) ));
4406	goto fail;
4407	}
4408
4409	/* Get the permset pointer from the new ACL entry. */
4410	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4411	DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4412	i, strerror(errno) ));
4413	goto fail;
4414	}
4415
4416	/* Map from wire to permissions. */
4417	if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4418	DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4419	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4420	goto fail;
4421	}
4422
4423	/* Now apply to the new ACL entry. */
4424	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4425	DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4426	i, strerror(errno) ));
4427	goto fail;
4428	}
4429
4430	if (tag_type == SMB_ACL_USER) {
4431	uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4432	uid_t uid = (uid_t)uidval;
4433	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4434	DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4435	(unsigned int)uid, i, strerror(errno) ));
4436	goto fail;
4437	}
4438	}
4439
4440	if (tag_type == SMB_ACL_GROUP) {
4441	uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4442	gid_t gid = (uid_t)gidval;
4443	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4444	DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4445	(unsigned int)gid, i, strerror(errno) ));
4446	goto fail;
4447	}
4448	}
4449	}
4450
4451	return the_acl;
4452
4453	fail:
4454
4455	if (the_acl != NULL) {
4456	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4457	}
4458	return NULL;
4459	}
4460
4461	/****************************************************************************
4462	Calls from UNIX extensions - Default POSIX ACL set.
4463	If num_def_acls == 0 and not a directory just return. If it is a directory
4464	and num_def_acls == 0 then remove the default acl. Else set the default acl
4465	on the directory.
4466	****************************************************************************/
4467
4468	bool set_unix_posix_default_acl(connection_struct conn, const char fname, const SMB_STRUCT_STAT *psbuf,
4469	uint16 num_def_acls, const char *pdata)
4470	{
4471	SMB_ACL_T def_acl = NULL;
4472
4473	if (!S_ISDIR(psbuf->st_ex_mode)) {
4474	if (num_def_acls) {
4475	DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4476	errno = EISDIR;
4477	return False;
4478	} else {
4479	return True;
4480	}
4481	}
4482
4483	if (!num_def_acls) {
4484	/* Remove the default ACL. */
4485	if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4486	DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4487	fname, strerror(errno) ));
4488	return False;
4489	}
4490	return True;
4491	}
4492
4493	if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4494	return False;
4495	}
4496
4497	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4498	DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4499	fname, strerror(errno) ));
4500	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4501	return False;
4502	}
4503
4504	DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4505	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4506	return True;
4507	}
4508
4509	/****************************************************************************
4510	Remove an ACL from a file. As we don't have acl_delete_entry() available
4511	we must read the current acl and copy all entries except MASK, USER and GROUP
4512	to a new acl, then set that. This (at least on Linux) causes any ACL to be
4513	removed.
4514	FIXME ! How does the share mask/mode fit into this.... ?
4515	****************************************************************************/
4516
4517	static bool remove_posix_acl(connection_struct conn, files_struct fsp, const char *fname)
4518	{
4519	SMB_ACL_T file_acl = NULL;
4520	int entry_id = SMB_ACL_FIRST_ENTRY;
4521	SMB_ACL_ENTRY_T entry;
4522	bool ret = False;
4523	/* Create a new ACL with only 3 entries, u/g/w. */
4524	SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4525	SMB_ACL_ENTRY_T user_ent = NULL;
4526	SMB_ACL_ENTRY_T group_ent = NULL;
4527	SMB_ACL_ENTRY_T other_ent = NULL;
4528
4529	if (new_file_acl == NULL) {
4530	DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4531	return False;
4532	}
4533
4534	/* Now create the u/g/w entries. */
4535	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4536	DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4537	fname, strerror(errno) ));
4538	goto done;
4539	}
4540	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4541	DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4542	fname, strerror(errno) ));
4543	goto done;
4544	}
4545
4546	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4547	DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4548	fname, strerror(errno) ));
4549	goto done;
4550	}
4551	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4552	DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4553	fname, strerror(errno) ));
4554	goto done;
4555	}
4556
4557	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4558	DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4559	fname, strerror(errno) ));
4560	goto done;
4561	}
4562	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4563	DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4564	fname, strerror(errno) ));
4565	goto done;
4566	}
4567
4568	/* Get the current file ACL. */
4569	if (fsp && fsp->fh->fd != -1) {
4570	file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4571	} else {
4572	file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4573	}
4574
4575	if (file_acl == NULL) {
4576	/* This is only returned if an error occurred. Even for a file with
4577	no acl a u/g/w acl should be returned. */
4578	DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4579	fname, strerror(errno) ));
4580	goto done;
4581	}
4582
4583	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4584	SMB_ACL_TAG_T tagtype;
4585	SMB_ACL_PERMSET_T permset;
4586
4587	entry_id = SMB_ACL_NEXT_ENTRY;
4588
4589	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4590	DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4591	fname, strerror(errno) ));
4592	goto done;
4593	}
4594
4595	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4596	DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4597	fname, strerror(errno) ));
4598	goto done;
4599	}
4600
4601	if (tagtype == SMB_ACL_USER_OBJ) {
4602	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4603	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4604	fname, strerror(errno) ));
4605	}
4606	} else if (tagtype == SMB_ACL_GROUP_OBJ) {
4607	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4608	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4609	fname, strerror(errno) ));
4610	}
4611	} else if (tagtype == SMB_ACL_OTHER) {
4612	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4613	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4614	fname, strerror(errno) ));
4615	}
4616	}
4617	}
4618
4619	/* Set the new empty file ACL. */
4620	if (fsp && fsp->fh->fd != -1) {
4621	if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4622	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4623	fname, strerror(errno) ));
4624	goto done;
4625	}
4626	} else {
4627	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4628	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4629	fname, strerror(errno) ));
4630	goto done;
4631	}
4632	}
4633
4634	ret = True;
4635
4636	done:
4637
4638	if (file_acl) {
4639	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4640	}
4641	if (new_file_acl) {
4642	SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4643	}
4644	return ret;
4645	}
4646
4647	/****************************************************************************
4648	Calls from UNIX extensions - POSIX ACL set.
4649	If num_def_acls == 0 then read/modify/write acl after removing all entries
4650	except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4651	****************************************************************************/
4652
4653	bool set_unix_posix_acl(connection_struct conn, files_struct fsp, const char fname, uint16 num_acls, const char pdata)
4654	{
4655	SMB_ACL_T file_acl = NULL;
4656
4657	if (!num_acls) {
4658	/* Remove the ACL from the file. */
4659	return remove_posix_acl(conn, fsp, fname);
4660	}
4661
4662	if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4663	return False;
4664	}
4665
4666	if (fsp && fsp->fh->fd != -1) {
4667	/* The preferred way - use an open fd. */
4668	if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4669	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4670	fname, strerror(errno) ));
4671	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4672	return False;
4673	}
4674	} else {
4675	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4676	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4677	fname, strerror(errno) ));
4678	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4679	return False;
4680	}
4681	}
4682
4683	DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4684	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4685	return True;
4686	}
4687
4688	/********************************************************************
4689	Pull the NT ACL from a file on disk or the OpenEventlog() access
4690	check. Caller is responsible for freeing the returned security
4691	descriptor via TALLOC_FREE(). This is designed for dealing with
4692	user space access checks in smbd outside of the VFS. For example,
4693	checking access rights in OpenEventlog().
4694
4695	Assume we are dealing with files (for now)
4696	********************************************************************/
4697
4698	SEC_DESC get_nt_acl_no_snum( TALLOC_CTX ctx, const char *fname)
4699	{
4700	SEC_DESC psd, ret_sd;
4701	connection_struct *conn;
4702	files_struct finfo;
4703	struct fd_handle fh;
4704	NTSTATUS status;
4705
4706	conn = TALLOC_ZERO_P(ctx, connection_struct);
4707	if (conn == NULL) {
4708	DEBUG(0, ("talloc failed\n"));
4709	return NULL;
4710	}
4711
4712	if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4713	DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4714	TALLOC_FREE(conn);
4715	return NULL;
4716	}
4717
4718	conn->params->service = -1;
4719
4720	set_conn_connectpath(conn, "/");
4721
4722	if (!smbd_vfs_init(conn)) {
4723	DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4724	conn_free(conn);
4725	return NULL;
4726	}
4727
4728	ZERO_STRUCT( finfo );
4729	ZERO_STRUCT( fh );
4730
4731	finfo.fnum = -1;
4732	finfo.conn = conn;
4733	finfo.fh = &fh;
4734	finfo.fh->fd = -1;
4735
4736	status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4737	&finfo.fsp_name);
4738	if (!NT_STATUS_IS_OK(status)) {
4739	conn_free(conn);
4740	return NULL;
4741	}
4742
4743	if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4744	DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4745	TALLOC_FREE(finfo.fsp_name);
4746	conn_free(conn);
4747	return NULL;
4748	}
4749
4750	ret_sd = dup_sec_desc( ctx, psd );
4751
4752	TALLOC_FREE(finfo.fsp_name);
4753	conn_free(conn);
4754
4755	return ret_sd;
4756	}

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