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posix_acls.c

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Last change on this file was 773, checked in by Herwig Bauernfeind, 12 years ago
Samba Server 3.5: Update branch to 3.5.20
File size: 142.6 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)
1127	#define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA\|FILE_APPEND_DATA\|FILE_WRITE_EA)
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	bool is_default_acl,
1346	const struct share_params *params,
1347	const bool is_directory,
1348	const DOM_SID *pfile_owner_sid,
1349	const DOM_SID *pfile_grp_sid,
1350	const SMB_STRUCT_STAT *pst,
1351	bool setting_acl)
1352	{
1353	canon_ace *pace;
1354	bool got_user = False;
1355	bool got_grp = False;
1356	bool got_other = False;
1357	canon_ace *pace_other = NULL;
1358
1359	for (pace = *pp_ace; pace; pace = pace->next) {
1360	if (pace->type == SMB_ACL_USER_OBJ) {
1361
1362	if (setting_acl) {
1363	/*
1364	* Ensure we have default parameters for the
1365	* user (owner) even on default ACLs.
1366	*/
1367	apply_default_perms(params, is_directory, pace, S_IRUSR);
1368	}
1369	got_user = True;
1370
1371	} else if (pace->type == SMB_ACL_GROUP_OBJ) {
1372
1373	/*
1374	* Ensure create mask/force create mode is respected on set.
1375	*/
1376
1377	if (setting_acl && !is_default_acl) {
1378	apply_default_perms(params, is_directory, pace, S_IRGRP);
1379	}
1380	got_grp = True;
1381
1382	} else if (pace->type == SMB_ACL_OTHER) {
1383
1384	/*
1385	* Ensure create mask/force create mode is respected on set.
1386	*/
1387
1388	if (setting_acl && !is_default_acl) {
1389	apply_default_perms(params, is_directory, pace, S_IROTH);
1390	}
1391	got_other = True;
1392	pace_other = pace;
1393
1394	} else if (pace->type == SMB_ACL_USER \|\| pace->type == SMB_ACL_GROUP) {
1395
1396	/*
1397	* Ensure create mask/force create mode is respected on set.
1398	*/
1399
1400	if (setting_acl && !is_default_acl) {
1401	apply_default_perms(params, is_directory, pace, S_IRGRP);
1402	}
1403	}
1404	}
1405
1406	if (!got_user) {
1407	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1408	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1409	return False;
1410	}
1411
1412	ZERO_STRUCTP(pace);
1413	pace->type = SMB_ACL_USER_OBJ;
1414	pace->owner_type = UID_ACE;
1415	pace->unix_ug.uid = pst->st_ex_uid;
1416	pace->trustee = *pfile_owner_sid;
1417	pace->attr = ALLOW_ACE;
1418	/* Start with existing permissions, principle of least
1419	surprises for the user. */
1420	pace->perms = pst->st_ex_mode;
1421
1422	if (setting_acl) {
1423	/* See if the owning user is in any of the other groups in
1424	the ACE, or if there's a matching user entry.
1425	If so, OR in the permissions from that entry. */
1426
1427	canon_ace *pace_iter;
1428
1429	for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1430	if (pace_iter->type == SMB_ACL_USER &&
1431	pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1432	pace->perms \|= pace_iter->perms;
1433	} else if (pace_iter->type == SMB_ACL_GROUP_OBJ \|\| pace_iter->type == SMB_ACL_GROUP) {
1434	if (uid_entry_in_group(pace, pace_iter)) {
1435	pace->perms \|= pace_iter->perms;
1436	}
1437	}
1438	}
1439
1440	if (pace->perms == 0) {
1441	/* If we only got an "everyone" perm, just use that. */
1442	if (got_other)
1443	pace->perms = pace_other->perms;
1444	}
1445
1446	/*
1447	* Ensure we have default parameters for the
1448	* user (owner) even on default ACLs.
1449	*/
1450	apply_default_perms(params, is_directory, pace, S_IRUSR);
1451	} else {
1452	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1453	}
1454
1455	DLIST_ADD(*pp_ace, pace);
1456	}
1457
1458	if (!got_grp) {
1459	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1460	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1461	return False;
1462	}
1463
1464	ZERO_STRUCTP(pace);
1465	pace->type = SMB_ACL_GROUP_OBJ;
1466	pace->owner_type = GID_ACE;
1467	pace->unix_ug.uid = pst->st_ex_gid;
1468	pace->trustee = *pfile_grp_sid;
1469	pace->attr = ALLOW_ACE;
1470	if (setting_acl) {
1471	/* If we only got an "everyone" perm, just use that. */
1472	if (got_other)
1473	pace->perms = pace_other->perms;
1474	else
1475	pace->perms = 0;
1476	if (!is_default_acl) {
1477	apply_default_perms(params, is_directory, pace, S_IRGRP);
1478	}
1479	} else {
1480	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1481	}
1482
1483	DLIST_ADD(*pp_ace, pace);
1484	}
1485
1486	if (!got_other) {
1487	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1488	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1489	return False;
1490	}
1491
1492	ZERO_STRUCTP(pace);
1493	pace->type = SMB_ACL_OTHER;
1494	pace->owner_type = WORLD_ACE;
1495	pace->unix_ug.world = -1;
1496	pace->trustee = global_sid_World;
1497	pace->attr = ALLOW_ACE;
1498	if (setting_acl) {
1499	pace->perms = 0;
1500	if (!is_default_acl) {
1501	apply_default_perms(params, is_directory, pace, S_IROTH);
1502	}
1503	} else
1504	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1505
1506	DLIST_ADD(*pp_ace, pace);
1507	}
1508
1509	return True;
1510	}
1511
1512	/****************************************************************************
1513	Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1514	If it does not have them, check if there are any entries where the trustee is the
1515	file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1516	Note we must not do this to default directory ACLs.
1517	****************************************************************************/
1518
1519	static void check_owning_objs(canon_ace ace, DOM_SID pfile_owner_sid, DOM_SID *pfile_grp_sid)
1520	{
1521	bool got_user_obj, got_group_obj;
1522	canon_ace *current_ace;
1523	int i, entries;
1524
1525	entries = count_canon_ace_list(ace);
1526	got_user_obj = False;
1527	got_group_obj = False;
1528
1529	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1530	if (current_ace->type == SMB_ACL_USER_OBJ)
1531	got_user_obj = True;
1532	else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1533	got_group_obj = True;
1534	}
1535	if (got_user_obj && got_group_obj) {
1536	DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1537	return;
1538	}
1539
1540	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1541	if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1542	sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1543	current_ace->type = SMB_ACL_USER_OBJ;
1544	got_user_obj = True;
1545	}
1546	if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1547	sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1548	current_ace->type = SMB_ACL_GROUP_OBJ;
1549	got_group_obj = True;
1550	}
1551	}
1552	if (!got_user_obj)
1553	DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1554	if (!got_group_obj)
1555	DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1556	}
1557
1558	/****************************************************************************
1559	Unpack a SEC_DESC into two canonical ace lists.
1560	****************************************************************************/
1561
1562	static bool create_canon_ace_lists(files_struct *fsp,
1563	const SMB_STRUCT_STAT *pst,
1564	DOM_SID *pfile_owner_sid,
1565	DOM_SID *pfile_grp_sid,
1566	canon_ace **ppfile_ace,
1567	canon_ace **ppdir_ace,
1568	const SEC_ACL *dacl)
1569	{
1570	bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1571	canon_ace *file_ace = NULL;
1572	canon_ace *dir_ace = NULL;
1573	canon_ace *current_ace = NULL;
1574	bool got_dir_allow = False;
1575	bool got_file_allow = False;
1576	int i, j;
1577
1578	*ppfile_ace = NULL;
1579	*ppdir_ace = NULL;
1580
1581	/*
1582	* Convert the incoming ACL into a more regular form.
1583	*/
1584
1585	for(i = 0; i < dacl->num_aces; i++) {
1586	SEC_ACE *psa = &dacl->aces[i];
1587
1588	if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1589	DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1590	return False;
1591	}
1592
1593	if (nt4_compatible_acls()) {
1594	/*
1595	* The security mask may be UNIX_ACCESS_NONE which should map into
1596	* no permissions (we overload the WRITE_OWNER bit for this) or it
1597	* should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1598	* to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1599	*/
1600
1601	/*
1602	* Convert GENERIC bits to specific bits.
1603	*/
1604
1605	se_map_generic(&psa->access_mask, &file_generic_mapping);
1606
1607	psa->access_mask &= (UNIX_ACCESS_NONE\|FILE_ALL_ACCESS);
1608
1609	if(psa->access_mask != UNIX_ACCESS_NONE)
1610	psa->access_mask &= ~UNIX_ACCESS_NONE;
1611	}
1612	}
1613
1614	/*
1615	* Deal with the fact that NT 4.x re-writes the canonical format
1616	* that we return for default ACLs. If a directory ACE is identical
1617	* to a inherited directory ACE then NT changes the bits so that the
1618	* first ACE is set to OI\|IO and the second ACE for this SID is set
1619	* to CI. We need to repair this. JRA.
1620	*/
1621
1622	for(i = 0; i < dacl->num_aces; i++) {
1623	SEC_ACE *psa1 = &dacl->aces[i];
1624
1625	for (j = i + 1; j < dacl->num_aces; j++) {
1626	SEC_ACE *psa2 = &dacl->aces[j];
1627
1628	if (psa1->access_mask != psa2->access_mask)
1629	continue;
1630
1631	if (!sid_equal(&psa1->trustee, &psa2->trustee))
1632	continue;
1633
1634	/*
1635	* Ok - permission bits and SIDs are equal.
1636	* Check if flags were re-written.
1637	*/
1638
1639	if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1640
1641	psa1->flags \|= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1642	psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1643
1644	} else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1645
1646	psa2->flags \|= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1647	psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1648
1649	}
1650	}
1651	}
1652
1653	for(i = 0; i < dacl->num_aces; i++) {
1654	SEC_ACE *psa = &dacl->aces[i];
1655
1656	/*
1657	* Create a cannon_ace entry representing this NT DACL ACE.
1658	*/
1659
1660	if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1661	free_canon_ace_list(file_ace);
1662	free_canon_ace_list(dir_ace);
1663	DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1664	return False;
1665	}
1666
1667	ZERO_STRUCTP(current_ace);
1668
1669	sid_copy(&current_ace->trustee, &psa->trustee);
1670
1671	/*
1672	* Try and work out if the SID is a user or group
1673	* as we need to flag these differently for POSIX.
1674	* Note what kind of a POSIX ACL this should map to.
1675	*/
1676
1677	if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1678	current_ace->owner_type = WORLD_ACE;
1679	current_ace->unix_ug.world = -1;
1680	current_ace->type = SMB_ACL_OTHER;
1681	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1682	current_ace->owner_type = UID_ACE;
1683	current_ace->unix_ug.uid = pst->st_ex_uid;
1684	current_ace->type = SMB_ACL_USER_OBJ;
1685
1686	/*
1687	* The Creator Owner entry only specifies inheritable permissions,
1688	* never access permissions. WinNT doesn't always set the ACE to
1689	* INHERIT_ONLY, though.
1690	*/
1691
1692	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1693
1694	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1695	current_ace->owner_type = GID_ACE;
1696	current_ace->unix_ug.gid = pst->st_ex_gid;
1697	current_ace->type = SMB_ACL_GROUP_OBJ;
1698
1699	/*
1700	* The Creator Group entry only specifies inheritable permissions,
1701	* never access permissions. WinNT doesn't always set the ACE to
1702	* INHERIT_ONLY, though.
1703	*/
1704	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1705
1706	} else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1707	current_ace->owner_type = UID_ACE;
1708	/* If it's the owning user, this is a user_obj, not
1709	* a user. */
1710	if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1711	current_ace->type = SMB_ACL_USER_OBJ;
1712	} else {
1713	current_ace->type = SMB_ACL_USER;
1714	}
1715	} else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1716	current_ace->owner_type = GID_ACE;
1717	/* If it's the primary group, this is a group_obj, not
1718	* a group. */
1719	if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1720	current_ace->type = SMB_ACL_GROUP_OBJ;
1721	} else {
1722	current_ace->type = SMB_ACL_GROUP;
1723	}
1724	} else {
1725	/*
1726	* Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1727	*/
1728
1729	if (non_mappable_sid(&psa->trustee)) {
1730	DEBUG(10, ("create_canon_ace_lists: ignoring "
1731	"non-mappable SID %s\n",
1732	sid_string_dbg(&psa->trustee)));
1733	SAFE_FREE(current_ace);
1734	continue;
1735	}
1736
1737	if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1738	DEBUG(10, ("create_canon_ace_lists: ignoring "
1739	"unknown or foreign SID %s\n",
1740	sid_string_dbg(&psa->trustee)));
1741	SAFE_FREE(current_ace);
1742	continue;
1743	}
1744
1745	free_canon_ace_list(file_ace);
1746	free_canon_ace_list(dir_ace);
1747	DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1748	"%s to uid or gid.\n",
1749	sid_string_dbg(&current_ace->trustee)));
1750	SAFE_FREE(current_ace);
1751	return False;
1752	}
1753
1754	/*
1755	* Map the given NT permissions into a UNIX mode_t containing only
1756	* S_I(R\|W\|X)USR bits.
1757	*/
1758
1759	current_ace->perms \|= map_nt_perms( &psa->access_mask, S_IRUSR);
1760	current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1761
1762	/* Store the ace_flag. */
1763	current_ace->ace_flags = psa->flags;
1764
1765	/*
1766	* Now add the created ace to either the file list, the directory
1767	* list, or both. We MUST preserve the order here (hence we use
1768	* DLIST_ADD_END) as NT ACLs are order dependent.
1769	*/
1770
1771	if (fsp->is_directory) {
1772
1773	/*
1774	* We can only add to the default POSIX ACE list if the ACE is
1775	* designed to be inherited by both files and directories.
1776	*/
1777
1778	if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1779	(SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1780
1781	canon_ace *current_dir_ace = current_ace;
1782	DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1783
1784	/*
1785	* Note if this was an allow ace. We can't process
1786	* any further deny ace's after this.
1787	*/
1788
1789	if (current_ace->attr == ALLOW_ACE)
1790	got_dir_allow = True;
1791
1792	if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1793	DEBUG(0,("create_canon_ace_lists: "
1794	"malformed ACL in "
1795	"inheritable ACL! Deny entry "
1796	"after Allow entry. Failing "
1797	"to set on file %s.\n",
1798	fsp_str_dbg(fsp)));
1799	free_canon_ace_list(file_ace);
1800	free_canon_ace_list(dir_ace);
1801	return False;
1802	}
1803
1804	if( DEBUGLVL( 10 )) {
1805	dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1806	print_canon_ace( current_ace, 0);
1807	}
1808
1809	/*
1810	* If this is not an inherit only ACE we need to add a duplicate
1811	* to the file acl.
1812	*/
1813
1814	if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1815	canon_ace *dup_ace = dup_canon_ace(current_ace);
1816
1817	if (!dup_ace) {
1818	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1819	free_canon_ace_list(file_ace);
1820	free_canon_ace_list(dir_ace);
1821	return False;
1822	}
1823
1824	/*
1825	* We must not free current_ace here as its
1826	* pointer is now owned by the dir_ace list.
1827	*/
1828	current_ace = dup_ace;
1829	/* We've essentially split this ace into two,
1830	* and added the ace with inheritance request
1831	* bits to the directory ACL. Drop those bits for
1832	* the ACE we're adding to the file list. */
1833	current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT\|
1834	SEC_ACE_FLAG_CONTAINER_INHERIT\|
1835	SEC_ACE_FLAG_INHERIT_ONLY);
1836	} else {
1837	/*
1838	* We must not free current_ace here as its
1839	* pointer is now owned by the dir_ace list.
1840	*/
1841	current_ace = NULL;
1842	}
1843
1844	/*
1845	* current_ace is now either owned by file_ace
1846	* or is NULL. We can safely operate on current_dir_ace
1847	* to treat mapping for default acl entries differently
1848	* than access acl entries.
1849	*/
1850
1851	if (current_dir_ace->owner_type == UID_ACE) {
1852	/*
1853	* We already decided above this is a uid,
1854	* for default acls ace's only CREATOR_OWNER
1855	* maps to ACL_USER_OBJ. All other uid
1856	* ace's are ACL_USER.
1857	*/
1858	if (sid_equal(&current_dir_ace->trustee,
1859	&global_sid_Creator_Owner)) {
1860	current_dir_ace->type = SMB_ACL_USER_OBJ;
1861	} else {
1862	current_dir_ace->type = SMB_ACL_USER;
1863	}
1864	}
1865
1866	if (current_dir_ace->owner_type == GID_ACE) {
1867	/*
1868	* We already decided above this is a gid,
1869	* for default acls ace's only CREATOR_GROUP
1870	* maps to ACL_GROUP_OBJ. All other uid
1871	* ace's are ACL_GROUP.
1872	*/
1873	if (sid_equal(&current_dir_ace->trustee,
1874	&global_sid_Creator_Group)) {
1875	current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1876	} else {
1877	current_dir_ace->type = SMB_ACL_GROUP;
1878	}
1879	}
1880	}
1881	}
1882
1883	/*
1884	* Only add to the file ACL if not inherit only.
1885	*/
1886
1887	if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1888	DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1889
1890	/*
1891	* Note if this was an allow ace. We can't process
1892	* any further deny ace's after this.
1893	*/
1894
1895	if (current_ace->attr == ALLOW_ACE)
1896	got_file_allow = True;
1897
1898	if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1899	DEBUG(0,("create_canon_ace_lists: malformed "
1900	"ACL in file ACL ! Deny entry after "
1901	"Allow entry. Failing to set on file "
1902	"%s.\n", fsp_str_dbg(fsp)));
1903	free_canon_ace_list(file_ace);
1904	free_canon_ace_list(dir_ace);
1905	return False;
1906	}
1907
1908	if( DEBUGLVL( 10 )) {
1909	dbgtext("create_canon_ace_lists: adding file ACL:\n");
1910	print_canon_ace( current_ace, 0);
1911	}
1912	all_aces_are_inherit_only = False;
1913	/*
1914	* We must not free current_ace here as its
1915	* pointer is now owned by the file_ace list.
1916	*/
1917	current_ace = NULL;
1918	}
1919
1920	/*
1921	* Free if ACE was not added.
1922	*/
1923
1924	SAFE_FREE(current_ace);
1925	}
1926
1927	if (fsp->is_directory && all_aces_are_inherit_only) {
1928	/*
1929	* Windows 2000 is doing one of these weird 'inherit acl'
1930	* traverses to conserve NTFS ACL resources. Just pretend
1931	* there was no DACL sent. JRA.
1932	*/
1933
1934	DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1935	free_canon_ace_list(file_ace);
1936	free_canon_ace_list(dir_ace);
1937	file_ace = NULL;
1938	dir_ace = NULL;
1939	} else {
1940	/*
1941	* Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1942	* the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1943	* entries can be converted to *_OBJ. Don't do this for the default
1944	* ACL, we will create them separately for this if needed inside
1945	* ensure_canon_entry_valid().
1946	*/
1947	if (file_ace) {
1948	check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1949	}
1950	}
1951
1952	*ppfile_ace = file_ace;
1953	*ppdir_ace = dir_ace;
1954
1955	return True;
1956	}
1957
1958	/****************************************************************************
1959	ASCII art time again... JRA :-).
1960
1961	We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1962	we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1963	entries). Secondly, the merge code has ensured that all duplicate SID entries for
1964	allow or deny have been merged, so the same SID can only appear once in the deny
1965	list or once in the allow list.
1966
1967	We then process as follows :
1968
1969	---------------------------------------------------------------------------
1970	First pass - look for a Everyone DENY entry.
1971
1972	If it is deny all (rwx) trunate the list at this point.
1973	Else, walk the list from this point and use the deny permissions of this
1974	entry as a mask on all following allow entries. Finally, delete
1975	the Everyone DENY entry (we have applied it to everything possible).
1976
1977	In addition, in this pass we remove any DENY entries that have
1978	no permissions (ie. they are a DENY nothing).
1979	---------------------------------------------------------------------------
1980	Second pass - only deal with deny user entries.
1981
1982	DENY user1 (perms XXX)
1983
1984	new_perms = 0
1985	for all following allow group entries where user1 is in group
1986	new_perms \|= group_perms;
1987
1988	user1 entry perms = new_perms & ~ XXX;
1989
1990	Convert the deny entry to an allow entry with the new perms and
1991	push to the end of the list. Note if the user was in no groups
1992	this maps to a specific allow nothing entry for this user.
1993
1994	The common case from the NT ACL choser (userX deny all) is
1995	optimised so we don't do the group lookup - we just map to
1996	an allow nothing entry.
1997
1998	What we're doing here is inferring the allow permissions the
1999	person setting the ACE on user1 wanted by looking at the allow
2000	permissions on the groups the user is currently in. This will
2001	be a snapshot, depending on group membership but is the best
2002	we can do and has the advantage of failing closed rather than
2003	open.
2004	---------------------------------------------------------------------------
2005	Third pass - only deal with deny group entries.
2006
2007	DENY group1 (perms XXX)
2008
2009	for all following allow user entries where user is in group1
2010	user entry perms = user entry perms & ~ XXX;
2011
2012	If there is a group Everyone allow entry with permissions YYY,
2013	convert the group1 entry to an allow entry and modify its
2014	permissions to be :
2015
2016	new_perms = YYY & ~ XXX
2017
2018	and push to the end of the list.
2019
2020	If there is no group Everyone allow entry then convert the
2021	group1 entry to a allow nothing entry and push to the end of the list.
2022
2023	Note that the common case from the NT ACL choser (groupX deny all)
2024	cannot be optimised here as we need to modify user entries who are
2025	in the group to change them to a deny all also.
2026
2027	What we're doing here is modifying the allow permissions of
2028	user entries (which are more specific in POSIX ACLs) to mask
2029	out the explicit deny set on the group they are in. This will
2030	be a snapshot depending on current group membership but is the
2031	best we can do and has the advantage of failing closed rather
2032	than open.
2033	---------------------------------------------------------------------------
2034	Fourth pass - cope with cumulative permissions.
2035
2036	for all allow user entries, if there exists an allow group entry with
2037	more permissive permissions, and the user is in that group, rewrite the
2038	allow user permissions to contain both sets of permissions.
2039
2040	Currently the code for this is #ifdef'ed out as these semantics make
2041	no sense to me. JRA.
2042	---------------------------------------------------------------------------
2043
2044	Note we MUST do the deny user pass first as this will convert deny user
2045	entries into allow user entries which can then be processed by the deny
2046	group pass.
2047
2048	The above algorithm took a lot of thinking about - hence this
2049	explaination :-). JRA.
2050	****************************************************************************/
2051
2052	/****************************************************************************
2053	Process a canon_ace list entries. This is very complex code. We need
2054	to go through and remove the "deny" permissions from any allow entry that matches
2055	the id of this entry. We have already refused any NT ACL that wasn't in correct
2056	order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2057	we just remove it (to fail safe). We have already removed any duplicate ace
2058	entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2059	allow entries.
2060	****************************************************************************/
2061
2062	static void process_deny_list( canon_ace **pp_ace_list )
2063	{
2064	canon_ace ace_list = pp_ace_list;
2065	canon_ace *curr_ace = NULL;
2066	canon_ace *curr_ace_next = NULL;
2067
2068	/* Pass 1 above - look for an Everyone, deny entry. */
2069
2070	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2071	canon_ace *allow_ace_p;
2072
2073	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2074
2075	if (curr_ace->attr != DENY_ACE)
2076	continue;
2077
2078	if (curr_ace->perms == (mode_t)0) {
2079
2080	/* Deny nothing entry - delete. */
2081
2082	DLIST_REMOVE(ace_list, curr_ace);
2083	continue;
2084	}
2085
2086	if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2087	continue;
2088
2089	/* JRATEST - assert. */
2090	SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2091
2092	if (curr_ace->perms == ALL_ACE_PERMS) {
2093
2094	/*
2095	* Optimisation. This is a DENY_ALL to Everyone. Truncate the
2096	* list at this point including this entry.
2097	*/
2098
2099	canon_ace *prev_entry = curr_ace->prev;
2100
2101	free_canon_ace_list( curr_ace );
2102	if (prev_entry)
2103	prev_entry->next = NULL;
2104	else {
2105	/* We deleted the entire list. */
2106	ace_list = NULL;
2107	}
2108	break;
2109	}
2110
2111	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2112
2113	/*
2114	* Only mask off allow entries.
2115	*/
2116
2117	if (allow_ace_p->attr != ALLOW_ACE)
2118	continue;
2119
2120	allow_ace_p->perms &= ~curr_ace->perms;
2121	}
2122
2123	/*
2124	* Now it's been applied, remove it.
2125	*/
2126
2127	DLIST_REMOVE(ace_list, curr_ace);
2128	}
2129
2130	/* Pass 2 above - deal with deny user entries. */
2131
2132	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2133	mode_t new_perms = (mode_t)0;
2134	canon_ace *allow_ace_p;
2135
2136	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2137
2138	if (curr_ace->attr != DENY_ACE)
2139	continue;
2140
2141	if (curr_ace->owner_type != UID_ACE)
2142	continue;
2143
2144	if (curr_ace->perms == ALL_ACE_PERMS) {
2145
2146	/*
2147	* Optimisation - this is a deny everything to this user.
2148	* Convert to an allow nothing and push to the end of the list.
2149	*/
2150
2151	curr_ace->attr = ALLOW_ACE;
2152	curr_ace->perms = (mode_t)0;
2153	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2154	continue;
2155	}
2156
2157	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2158
2159	if (allow_ace_p->attr != ALLOW_ACE)
2160	continue;
2161
2162	/* We process GID_ACE and WORLD_ACE entries only. */
2163
2164	if (allow_ace_p->owner_type == UID_ACE)
2165	continue;
2166
2167	if (uid_entry_in_group( curr_ace, allow_ace_p))
2168	new_perms \|= allow_ace_p->perms;
2169	}
2170
2171	/*
2172	* Convert to a allow entry, modify the perms and push to the end
2173	* of the list.
2174	*/
2175
2176	curr_ace->attr = ALLOW_ACE;
2177	curr_ace->perms = (new_perms & ~curr_ace->perms);
2178	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2179	}
2180
2181	/* Pass 3 above - deal with deny group entries. */
2182
2183	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2184	canon_ace *allow_ace_p;
2185	canon_ace *allow_everyone_p = NULL;
2186
2187	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2188
2189	if (curr_ace->attr != DENY_ACE)
2190	continue;
2191
2192	if (curr_ace->owner_type != GID_ACE)
2193	continue;
2194
2195	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2196
2197	if (allow_ace_p->attr != ALLOW_ACE)
2198	continue;
2199
2200	/* Store a pointer to the Everyone allow, if it exists. */
2201	if (allow_ace_p->owner_type == WORLD_ACE)
2202	allow_everyone_p = allow_ace_p;
2203
2204	/* We process UID_ACE entries only. */
2205
2206	if (allow_ace_p->owner_type != UID_ACE)
2207	continue;
2208
2209	/* Mask off the deny group perms. */
2210
2211	if (uid_entry_in_group( allow_ace_p, curr_ace))
2212	allow_ace_p->perms &= ~curr_ace->perms;
2213	}
2214
2215	/*
2216	* Convert the deny to an allow with the correct perms and
2217	* push to the end of the list.
2218	*/
2219
2220	curr_ace->attr = ALLOW_ACE;
2221	if (allow_everyone_p)
2222	curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2223	else
2224	curr_ace->perms = (mode_t)0;
2225	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2226	}
2227
2228	/* Doing this fourth pass allows Windows semantics to be layered
2229	* on top of POSIX semantics. I'm not sure if this is desirable.
2230	* For example, in W2K ACLs there is no way to say, "Group X no
2231	* access, user Y full access" if user Y is a member of group X.
2232	* This seems completely broken semantics to me.... JRA.
2233	*/
2234
2235	#if 0
2236	/* Pass 4 above - deal with allow entries. */
2237
2238	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2239	canon_ace *allow_ace_p;
2240
2241	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2242
2243	if (curr_ace->attr != ALLOW_ACE)
2244	continue;
2245
2246	if (curr_ace->owner_type != UID_ACE)
2247	continue;
2248
2249	for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2250
2251	if (allow_ace_p->attr != ALLOW_ACE)
2252	continue;
2253
2254	/* We process GID_ACE entries only. */
2255
2256	if (allow_ace_p->owner_type != GID_ACE)
2257	continue;
2258
2259	/* OR in the group perms. */
2260
2261	if (uid_entry_in_group( curr_ace, allow_ace_p))
2262	curr_ace->perms \|= allow_ace_p->perms;
2263	}
2264	}
2265	#endif
2266
2267	*pp_ace_list = ace_list;
2268	}
2269
2270	/****************************************************************************
2271	Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2272	succeeding.
2273	****************************************************************************/
2274
2275	static bool unpack_canon_ace(files_struct *fsp,
2276	const SMB_STRUCT_STAT *pst,
2277	DOM_SID *pfile_owner_sid,
2278	DOM_SID *pfile_grp_sid,
2279	canon_ace **ppfile_ace,
2280	canon_ace **ppdir_ace,
2281	uint32 security_info_sent,
2282	const SEC_DESC *psd)
2283	{
2284	canon_ace *file_ace = NULL;
2285	canon_ace *dir_ace = NULL;
2286
2287	*ppfile_ace = NULL;
2288	*ppdir_ace = NULL;
2289
2290	if(security_info_sent == 0) {
2291	DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2292	return False;
2293	}
2294
2295	/*
2296	* If no DACL then this is a chown only security descriptor.
2297	*/
2298
2299	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| !psd->dacl)
2300	return True;
2301
2302	/*
2303	* Now go through the DACL and create the canon_ace lists.
2304	*/
2305
2306	if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2307	&file_ace, &dir_ace, psd->dacl))
2308	return False;
2309
2310	if ((file_ace == NULL) && (dir_ace == NULL)) {
2311	/* W2K traverse DACL set - ignore. */
2312	return True;
2313	}
2314
2315	/*
2316	* Go through the canon_ace list and merge entries
2317	* belonging to identical users of identical allow or deny type.
2318	* We can do this as all deny entries come first, followed by
2319	* all allow entries (we have mandated this before accepting this acl).
2320	*/
2321
2322	print_canon_ace_list( "file ace - before merge", file_ace);
2323	merge_aces( &file_ace, false);
2324
2325	print_canon_ace_list( "dir ace - before merge", dir_ace);
2326	merge_aces( &dir_ace, true);
2327
2328	/*
2329	* NT ACLs are order dependent. Go through the acl lists and
2330	* process DENY entries by masking the allow entries.
2331	*/
2332
2333	print_canon_ace_list( "file ace - before deny", file_ace);
2334	process_deny_list( &file_ace);
2335
2336	print_canon_ace_list( "dir ace - before deny", dir_ace);
2337	process_deny_list( &dir_ace);
2338
2339	/*
2340	* A well formed POSIX file or default ACL has at least 3 entries, a
2341	* SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2342	* and optionally a mask entry. Ensure this is the case.
2343	*/
2344
2345	print_canon_ace_list( "file ace - before valid", file_ace);
2346
2347	if (!ensure_canon_entry_valid(&file_ace, false, fsp->conn->params,
2348	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2349	free_canon_ace_list(file_ace);
2350	free_canon_ace_list(dir_ace);
2351	return False;
2352	}
2353
2354	print_canon_ace_list( "dir ace - before valid", dir_ace);
2355
2356	if (dir_ace && !ensure_canon_entry_valid(&dir_ace, true, fsp->conn->params,
2357	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2358	free_canon_ace_list(file_ace);
2359	free_canon_ace_list(dir_ace);
2360	return False;
2361	}
2362
2363	print_canon_ace_list( "file ace - return", file_ace);
2364	print_canon_ace_list( "dir ace - return", dir_ace);
2365
2366	*ppfile_ace = file_ace;
2367	*ppdir_ace = dir_ace;
2368	return True;
2369
2370	}
2371
2372	/******************************************************************************
2373	When returning permissions, try and fit NT display
2374	semantics if possible. Note the the canon_entries here must have been malloced.
2375	The list format should be - first entry = owner, followed by group and other user
2376	entries, last entry = other.
2377
2378	Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2379	are not ordered, and match on the most specific entry rather than walking a list,
2380	then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2381
2382	Entry 0: owner : deny all except read and write.
2383	Entry 1: owner : allow read and write.
2384	Entry 2: group : deny all except read.
2385	Entry 3: group : allow read.
2386	Entry 4: Everyone : allow read.
2387
2388	But NT cannot display this in their ACL editor !
2389	********************************************************************************/
2390
2391	static void arrange_posix_perms(const char filename, canon_ace *pp_list_head)
2392	{
2393	canon_ace l_head = pp_list_head;
2394	canon_ace *owner_ace = NULL;
2395	canon_ace *other_ace = NULL;
2396	canon_ace *ace = NULL;
2397
2398	for (ace = l_head; ace; ace = ace->next) {
2399	if (ace->type == SMB_ACL_USER_OBJ)
2400	owner_ace = ace;
2401	else if (ace->type == SMB_ACL_OTHER) {
2402	/* Last ace - this is "other" */
2403	other_ace = ace;
2404	}
2405	}
2406
2407	if (!owner_ace \|\| !other_ace) {
2408	DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2409	filename ));
2410	return;
2411	}
2412
2413	/*
2414	* The POSIX algorithm applies to owner first, and other last,
2415	* so ensure they are arranged in this order.
2416	*/
2417
2418	if (owner_ace) {
2419	DLIST_PROMOTE(l_head, owner_ace);
2420	}
2421
2422	if (other_ace) {
2423	DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2424	}
2425
2426	/* We have probably changed the head of the list. */
2427
2428	*pp_list_head = l_head;
2429	}
2430
2431	/****************************************************************************
2432	Create a linked list of canonical ACE entries.
2433	****************************************************************************/
2434
2435	static canon_ace canonicalise_acl(struct connection_struct conn,
2436	const char *fname, SMB_ACL_T posix_acl,
2437	const SMB_STRUCT_STAT *psbuf,
2438	const DOM_SID powner, const DOM_SID pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2439	{
2440	mode_t acl_mask = (S_IRUSR\|S_IWUSR\|S_IXUSR);
2441	canon_ace *l_head = NULL;
2442	canon_ace *ace = NULL;
2443	canon_ace *next_ace = NULL;
2444	int entry_id = SMB_ACL_FIRST_ENTRY;
2445	bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2446	SMB_ACL_ENTRY_T entry;
2447	size_t ace_count;
2448
2449	while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2450	SMB_ACL_TAG_T tagtype;
2451	SMB_ACL_PERMSET_T permset;
2452	DOM_SID sid;
2453	posix_id unix_ug;
2454	enum ace_owner owner_type;
2455
2456	entry_id = SMB_ACL_NEXT_ENTRY;
2457
2458	/* Is this a MASK entry ? */
2459	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2460	continue;
2461
2462	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2463	continue;
2464
2465	/* Decide which SID to use based on the ACL type. */
2466	switch(tagtype) {
2467	case SMB_ACL_USER_OBJ:
2468	/* Get the SID from the owner. */
2469	sid_copy(&sid, powner);
2470	unix_ug.uid = psbuf->st_ex_uid;
2471	owner_type = UID_ACE;
2472	break;
2473	case SMB_ACL_USER:
2474	{
2475	uid_t puid = (uid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2476	if (puid == NULL) {
2477	DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2478	continue;
2479	}
2480	uid_to_sid( &sid, *puid);
2481	unix_ug.uid = *puid;
2482	owner_type = UID_ACE;
2483	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2484	break;
2485	}
2486	case SMB_ACL_GROUP_OBJ:
2487	/* Get the SID from the owning group. */
2488	sid_copy(&sid, pgroup);
2489	unix_ug.gid = psbuf->st_ex_gid;
2490	owner_type = GID_ACE;
2491	break;
2492	case SMB_ACL_GROUP:
2493	{
2494	gid_t pgid = (gid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2495	if (pgid == NULL) {
2496	DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2497	continue;
2498	}
2499	gid_to_sid( &sid, *pgid);
2500	unix_ug.gid = *pgid;
2501	owner_type = GID_ACE;
2502	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2503	break;
2504	}
2505	case SMB_ACL_MASK:
2506	acl_mask = convert_permset_to_mode_t(conn, permset);
2507	continue; /* Don't count the mask as an entry. */
2508	case SMB_ACL_OTHER:
2509	/* Use the Everyone SID */
2510	sid = global_sid_World;
2511	unix_ug.world = -1;
2512	owner_type = WORLD_ACE;
2513	break;
2514	default:
2515	DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2516	continue;
2517	}
2518
2519	/*
2520	* Add this entry to the list.
2521	*/
2522
2523	if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2524	goto fail;
2525
2526	ZERO_STRUCTP(ace);
2527	ace->type = tagtype;
2528	ace->perms = convert_permset_to_mode_t(conn, permset);
2529	ace->attr = ALLOW_ACE;
2530	ace->trustee = sid;
2531	ace->unix_ug = unix_ug;
2532	ace->owner_type = owner_type;
2533	ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2534
2535	DLIST_ADD(l_head, ace);
2536	}
2537
2538	/*
2539	* This next call will ensure we have at least a user/group/world set.
2540	*/
2541
2542	if (!ensure_canon_entry_valid(&l_head, is_default_acl, conn->params,
2543	S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2544	psbuf, False))
2545	goto fail;
2546
2547	/*
2548	* Now go through the list, masking the permissions with the
2549	* acl_mask. Ensure all DENY Entries are at the start of the list.
2550	*/
2551
2552	DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2553
2554	for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2555	next_ace = ace->next;
2556
2557	/* Masks are only applied to entries other than USER_OBJ and OTHER. */
2558	if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2559	ace->perms &= acl_mask;
2560
2561	if (ace->perms == 0) {
2562	DLIST_PROMOTE(l_head, ace);
2563	}
2564
2565	if( DEBUGLVL( 10 ) ) {
2566	print_canon_ace(ace, ace_count);
2567	}
2568	}
2569
2570	arrange_posix_perms(fname,&l_head );
2571
2572	print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2573
2574	return l_head;
2575
2576	fail:
2577
2578	free_canon_ace_list(l_head);
2579	return NULL;
2580	}
2581
2582	/****************************************************************************
2583	Check if the current user group list contains a given group.
2584	****************************************************************************/
2585
2586	bool current_user_in_group(gid_t gid)
2587	{
2588	int i;
2589
2590	for (i = 0; i < current_user.ut.ngroups; i++) {
2591	if (current_user.ut.groups[i] == gid) {
2592	return True;
2593	}
2594	}
2595
2596	return False;
2597	}
2598
2599	/****************************************************************************
2600	Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2601	****************************************************************************/
2602
2603	static bool acl_group_override(connection_struct *conn,
2604	const struct smb_filename *smb_fname)
2605	{
2606	if ((errno != EPERM) && (errno != EACCES)) {
2607	return false;
2608	}
2609
2610	/* file primary group == user primary or supplementary group */
2611	if (lp_acl_group_control(SNUM(conn)) &&
2612	current_user_in_group(smb_fname->st.st_ex_gid)) {
2613	return true;
2614	}
2615
2616	/* user has writeable permission */
2617	if (lp_dos_filemode(SNUM(conn)) &&
2618	can_write_to_file(conn, smb_fname)) {
2619	return true;
2620	}
2621
2622	return false;
2623	}
2624
2625	/****************************************************************************
2626	Attempt to apply an ACL to a file or directory.
2627	****************************************************************************/
2628
2629	static bool set_canon_ace_list(files_struct *fsp,
2630	canon_ace *the_ace,
2631	bool default_ace,
2632	const SMB_STRUCT_STAT *psbuf,
2633	bool *pacl_set_support)
2634	{
2635	connection_struct *conn = fsp->conn;
2636	bool ret = False;
2637	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2638	canon_ace *p_ace;
2639	int i;
2640	SMB_ACL_ENTRY_T mask_entry;
2641	bool got_mask_entry = False;
2642	SMB_ACL_PERMSET_T mask_permset;
2643	SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2644	bool needs_mask = False;
2645	mode_t mask_perms = 0;
2646
2647	/* Use the psbuf that was passed in. */
2648	if (psbuf != &fsp->fsp_name->st) {
2649	fsp->fsp_name->st = *psbuf;
2650	}
2651
2652	#if defined(POSIX_ACL_NEEDS_MASK)
2653	/* HP-UX always wants to have a mask (called "class" there). */
2654	needs_mask = True;
2655	#endif
2656
2657	if (the_acl == NULL) {
2658
2659	if (!no_acl_syscall_error(errno)) {
2660	/*
2661	* Only print this error message if we have some kind of ACL
2662	* support that's not working. Otherwise we would always get this.
2663	*/
2664	DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2665	default_ace ? "default" : "file", strerror(errno) ));
2666	}
2667	*pacl_set_support = False;
2668	goto fail;
2669	}
2670
2671	if( DEBUGLVL( 10 )) {
2672	dbgtext("set_canon_ace_list: setting ACL:\n");
2673	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2674	print_canon_ace( p_ace, i);
2675	}
2676	}
2677
2678	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2679	SMB_ACL_ENTRY_T the_entry;
2680	SMB_ACL_PERMSET_T the_permset;
2681
2682	/*
2683	* ACLs only "need" an ACL_MASK entry if there are any named user or
2684	* named group entries. But if there is an ACL_MASK entry, it applies
2685	* to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2686	* so that it doesn't deny (i.e., mask off) any permissions.
2687	*/
2688
2689	if (p_ace->type == SMB_ACL_USER \|\| p_ace->type == SMB_ACL_GROUP) {
2690	needs_mask = True;
2691	mask_perms \|= p_ace->perms;
2692	} else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2693	mask_perms \|= p_ace->perms;
2694	}
2695
2696	/*
2697	* Get the entry for this ACE.
2698	*/
2699
2700	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2701	DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2702	i, strerror(errno) ));
2703	goto fail;
2704	}
2705
2706	if (p_ace->type == SMB_ACL_MASK) {
2707	mask_entry = the_entry;
2708	got_mask_entry = True;
2709	}
2710
2711	/*
2712	* Ok - we now know the ACL calls should be working, don't
2713	* allow fallback to chmod.
2714	*/
2715
2716	*pacl_set_support = True;
2717
2718	/*
2719	* Initialise the entry from the canon_ace.
2720	*/
2721
2722	/*
2723	* First tell the entry what type of ACE this is.
2724	*/
2725
2726	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2727	DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2728	i, strerror(errno) ));
2729	goto fail;
2730	}
2731
2732	/*
2733	* Only set the qualifier (user or group id) if the entry is a user
2734	* or group id ACE.
2735	*/
2736
2737	if ((p_ace->type == SMB_ACL_USER) \|\| (p_ace->type == SMB_ACL_GROUP)) {
2738	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2739	DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2740	i, strerror(errno) ));
2741	goto fail;
2742	}
2743	}
2744
2745	/*
2746	* Convert the mode_t perms in the canon_ace to a POSIX permset.
2747	*/
2748
2749	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2750	DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2751	i, strerror(errno) ));
2752	goto fail;
2753	}
2754
2755	if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2756	DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2757	(unsigned int)p_ace->perms, i, strerror(errno) ));
2758	goto fail;
2759	}
2760
2761	/*
2762	* ..and apply them to the entry.
2763	*/
2764
2765	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2766	DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2767	i, strerror(errno) ));
2768	goto fail;
2769	}
2770
2771	if( DEBUGLVL( 10 ))
2772	print_canon_ace( p_ace, i);
2773
2774	}
2775
2776	if (needs_mask && !got_mask_entry) {
2777	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2778	DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2779	goto fail;
2780	}
2781
2782	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2783	DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2784	goto fail;
2785	}
2786
2787	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2788	DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2789	goto fail;
2790	}
2791
2792	if (map_acl_perms_to_permset(conn, S_IRUSR\|S_IWUSR\|S_IXUSR, &mask_permset) == -1) {
2793	DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2794	goto fail;
2795	}
2796
2797	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2798	DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2799	goto fail;
2800	}
2801	}
2802
2803	/*
2804	* Finally apply it to the file or directory.
2805	*/
2806
2807	if(default_ace \|\| fsp->is_directory \|\| fsp->fh->fd == -1) {
2808	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2809	the_acl_type, the_acl) == -1) {
2810	/*
2811	* Some systems allow all the above calls and only fail with no ACL support
2812	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2813	*/
2814	if (no_acl_syscall_error(errno)) {
2815	*pacl_set_support = False;
2816	}
2817
2818	if (acl_group_override(conn, fsp->fsp_name)) {
2819	int sret;
2820
2821	DEBUG(5,("set_canon_ace_list: acl group "
2822	"control on and current user in file "
2823	"%s primary group.\n",
2824	fsp_str_dbg(fsp)));
2825
2826	become_root();
2827	sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2828	fsp->fsp_name->base_name, the_acl_type,
2829	the_acl);
2830	unbecome_root();
2831	if (sret == 0) {
2832	ret = True;
2833	}
2834	}
2835
2836	if (ret == False) {
2837	DEBUG(2,("set_canon_ace_list: "
2838	"sys_acl_set_file type %s failed for "
2839	"file %s (%s).\n",
2840	the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2841	"directory default" : "file",
2842	fsp_str_dbg(fsp), strerror(errno)));
2843	goto fail;
2844	}
2845	}
2846	} else {
2847	if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2848	/*
2849	* Some systems allow all the above calls and only fail with no ACL support
2850	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2851	*/
2852	if (no_acl_syscall_error(errno)) {
2853	*pacl_set_support = False;
2854	}
2855
2856	if (acl_group_override(conn, fsp->fsp_name)) {
2857	int sret;
2858
2859	DEBUG(5,("set_canon_ace_list: acl group "
2860	"control on and current user in file "
2861	"%s primary group.\n",
2862	fsp_str_dbg(fsp)));
2863
2864	become_root();
2865	sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2866	unbecome_root();
2867	if (sret == 0) {
2868	ret = True;
2869	}
2870	}
2871
2872	if (ret == False) {
2873	DEBUG(2,("set_canon_ace_list: "
2874	"sys_acl_set_file failed for file %s "
2875	"(%s).\n",
2876	fsp_str_dbg(fsp), strerror(errno)));
2877	goto fail;
2878	}
2879	}
2880	}
2881
2882	ret = True;
2883
2884	fail:
2885
2886	if (the_acl != NULL) {
2887	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2888	}
2889
2890	return ret;
2891	}
2892
2893	/****************************************************************************
2894	Find a particular canon_ace entry.
2895	****************************************************************************/
2896
2897	static struct canon_ace canon_ace_entry_for(struct canon_ace list, SMB_ACL_TAG_T type, posix_id *id)
2898	{
2899	while (list) {
2900	if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) \|\|
2901	(type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) \|\|
2902	(type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2903	break;
2904	list = list->next;
2905	}
2906	return list;
2907	}
2908
2909	/****************************************************************************
2910
2911	****************************************************************************/
2912
2913	SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2914	{
2915	SMB_ACL_ENTRY_T entry;
2916
2917	if (!the_acl)
2918	return NULL;
2919	if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2920	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2921	return NULL;
2922	}
2923	return the_acl;
2924	}
2925
2926	/****************************************************************************
2927	Convert a canon_ace to a generic 3 element permission - if possible.
2928	****************************************************************************/
2929
2930	#define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2931
2932	static bool convert_canon_ace_to_posix_perms( files_struct fsp, canon_ace file_ace_list, mode_t *posix_perms)
2933	{
2934	int snum = SNUM(fsp->conn);
2935	size_t ace_count = count_canon_ace_list(file_ace_list);
2936	canon_ace *ace_p;
2937	canon_ace *owner_ace = NULL;
2938	canon_ace *group_ace = NULL;
2939	canon_ace *other_ace = NULL;
2940	mode_t and_bits;
2941	mode_t or_bits;
2942
2943	if (ace_count != 3) {
2944	DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2945	"entries for file %s to convert to posix perms.\n",
2946	fsp_str_dbg(fsp)));
2947	return False;
2948	}
2949
2950	for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2951	if (ace_p->owner_type == UID_ACE)
2952	owner_ace = ace_p;
2953	else if (ace_p->owner_type == GID_ACE)
2954	group_ace = ace_p;
2955	else if (ace_p->owner_type == WORLD_ACE)
2956	other_ace = ace_p;
2957	}
2958
2959	if (!owner_ace \|\| !group_ace \|\| !other_ace) {
2960	DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2961	"standard entries for file %s.\n", fsp_str_dbg(fsp)));
2962	return False;
2963	}
2964
2965	*posix_perms = (mode_t)0;
2966
2967	*posix_perms \|= owner_ace->perms;
2968	*posix_perms \|= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2969	*posix_perms \|= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2970	*posix_perms \|= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2971	*posix_perms \|= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2972	*posix_perms \|= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2973	*posix_perms \|= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2974
2975	/* The owner must have at least read access. */
2976
2977	*posix_perms \|= S_IRUSR;
2978	if (fsp->is_directory)
2979	*posix_perms \|= (S_IWUSR\|S_IXUSR);
2980
2981	/* If requested apply the masks. */
2982
2983	/* Get the initial bits to apply. */
2984
2985	if (fsp->is_directory) {
2986	and_bits = lp_dir_security_mask(snum);
2987	or_bits = lp_force_dir_security_mode(snum);
2988	} else {
2989	and_bits = lp_security_mask(snum);
2990	or_bits = lp_force_security_mode(snum);
2991	}
2992
2993	posix_perms = (((posix_perms) & and_bits)\|or_bits);
2994
2995	DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2996	"to perm=0%o for file %s.\n", (int)owner_ace->perms,
2997	(int)group_ace->perms, (int)other_ace->perms,
2998	(int)*posix_perms, fsp_str_dbg(fsp)));
2999
3000	return True;
3001	}
3002
3003	/****************************************************************************
3004	Incoming NT ACLs on a directory can be split into a default POSIX acl (CI\|OI\|IO) and
3005	a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3006	with CI\|OI set so it is inherited and also applies to the directory.
3007	Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3008	****************************************************************************/
3009
3010	static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3011	{
3012	size_t i, j;
3013
3014	for (i = 0; i < num_aces; i++) {
3015	for (j = i+1; j < num_aces; j++) {
3016	uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3017	uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3018	bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3019	bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3020
3021	/* We know the lower number ACE's are file entries. */
3022	if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3023	(nt_ace_list[i].size == nt_ace_list[j].size) &&
3024	(nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3025	sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3026	(i_inh == j_inh) &&
3027	(i_flags_ni == 0) &&
3028	(j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT\|
3029	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3030	SEC_ACE_FLAG_INHERIT_ONLY))) {
3031	/*
3032	* W2K wants to have access allowed zero access ACE's
3033	* at the end of the list. If the mask is zero, merge
3034	* the non-inherited ACE onto the inherited ACE.
3035	*/
3036
3037	if (nt_ace_list[i].access_mask == 0) {
3038	nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3039	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3040	if (num_aces - i - 1 > 0)
3041	memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3042	sizeof(SEC_ACE));
3043
3044	DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3045	(unsigned int)i, (unsigned int)j ));
3046	} else {
3047	/*
3048	* These are identical except for the flags.
3049	* Merge the inherited ACE onto the non-inherited ACE.
3050	*/
3051
3052	nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3053	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3054	if (num_aces - j - 1 > 0)
3055	memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3056	sizeof(SEC_ACE));
3057
3058	DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3059	(unsigned int)j, (unsigned int)i ));
3060	}
3061	num_aces--;
3062	break;
3063	}
3064	}
3065	}
3066
3067	return num_aces;
3068	}
3069
3070	/*
3071	* Add or Replace ACE entry.
3072	* In some cases we need to add a specific ACE for compatibility reasons.
3073	* When doing that we must make sure we are not actually creating a duplicate
3074	* entry. So we need to search whether an ACE entry already exist and eventually
3075	* replacce the access mask, or add a completely new entry if none was found.
3076	*
3077	* This function assumes the array has enough space to add a new entry without
3078	* any reallocation of memory.
3079	*/
3080
3081	static void add_or_replace_ace(SEC_ACE nt_ace_list, size_t num_aces,
3082	const DOM_SID *sid, enum security_ace_type type,
3083	uint32_t mask, uint8_t flags)
3084	{
3085	int i;
3086
3087	/* first search for a duplicate */
3088	for (i = 0; i < *num_aces; i++) {
3089	if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3090	(nt_ace_list[i].flags == flags)) break;
3091	}
3092
3093	if (i < num_aces) { / found */
3094	nt_ace_list[i].type = type;
3095	nt_ace_list[i].access_mask = mask;
3096	DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3097	i, sid_string_dbg(sid), flags));
3098	return;
3099	}
3100
3101	/* not found, append it */
3102	init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3103	}
3104
3105
3106	/****************************************************************************
3107	Reply to query a security descriptor from an fsp. If it succeeds it allocates
3108	the space for the return elements and returns the size needed to return the
3109	security descriptor. This should be the only external function needed for
3110	the UNIX style get ACL.
3111	****************************************************************************/
3112
3113	static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3114	const char *name,
3115	const SMB_STRUCT_STAT *sbuf,
3116	struct pai_val *pal,
3117	SMB_ACL_T posix_acl,
3118	SMB_ACL_T def_acl,
3119	uint32_t security_info,
3120	SEC_DESC **ppdesc)
3121	{
3122	DOM_SID owner_sid;
3123	DOM_SID group_sid;
3124	size_t sd_size = 0;
3125	SEC_ACL *psa = NULL;
3126	size_t num_acls = 0;
3127	size_t num_def_acls = 0;
3128	size_t num_aces = 0;
3129	canon_ace *file_ace = NULL;
3130	canon_ace *dir_ace = NULL;
3131	SEC_ACE *nt_ace_list = NULL;
3132	size_t num_profile_acls = 0;
3133	DOM_SID orig_owner_sid;
3134	SEC_DESC *psd = NULL;
3135	int i;
3136
3137	/*
3138	* Get the owner, group and world SIDs.
3139	*/
3140
3141	create_file_sids(sbuf, &owner_sid, &group_sid);
3142
3143	if (lp_profile_acls(SNUM(conn))) {
3144	/* For WXP SP1 the owner must be administrators. */
3145	sid_copy(&orig_owner_sid, &owner_sid);
3146	sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3147	sid_copy(&group_sid, &global_sid_Builtin_Users);
3148	num_profile_acls = 3;
3149	}
3150
3151	if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3152
3153	/*
3154	* In the optimum case Creator Owner and Creator Group would be used for
3155	* the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3156	* would lead to usability problems under Windows: The Creator entries
3157	* are only available in browse lists of directories and not for files;
3158	* additionally the identity of the owning group couldn't be determined.
3159	* We therefore use those identities only for Default ACLs.
3160	*/
3161
3162	/* Create the canon_ace lists. */
3163	file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3164	&owner_sid, &group_sid, pal,
3165	SMB_ACL_TYPE_ACCESS);
3166
3167	/* We must have some ACLS. */
3168
3169	if (count_canon_ace_list(file_ace) == 0) {
3170	DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3171	goto done;
3172	}
3173
3174	if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3175	dir_ace = canonicalise_acl(conn, name, def_acl,
3176	sbuf,
3177	&global_sid_Creator_Owner,
3178	&global_sid_Creator_Group,
3179	pal, SMB_ACL_TYPE_DEFAULT);
3180	}
3181
3182	/*
3183	* Create the NT ACE list from the canonical ace lists.
3184	*/
3185
3186	{
3187	canon_ace *ace;
3188	enum security_ace_type nt_acl_type;
3189
3190	if (nt4_compatible_acls() && dir_ace) {
3191	/*
3192	* NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3193	* but no non-INHERIT_ONLY entry for one SID. So we only
3194	* remove entries from the Access ACL if the
3195	* corresponding Default ACL entries have also been
3196	* removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3197	* are exceptions. We can do nothing
3198	* intelligent if the Default ACL contains entries that
3199	* are not also contained in the Access ACL, so this
3200	* case will still fail under NT 4.
3201	*/
3202
3203	ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3204	if (ace && !ace->perms) {
3205	DLIST_REMOVE(dir_ace, ace);
3206	SAFE_FREE(ace);
3207
3208	ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3209	if (ace && !ace->perms) {
3210	DLIST_REMOVE(file_ace, ace);
3211	SAFE_FREE(ace);
3212	}
3213	}
3214
3215	/*
3216	* WinNT doesn't usually have Creator Group
3217	* in browse lists, so we send this entry to
3218	* WinNT even if it contains no relevant
3219	* permissions. Once we can add
3220	* Creator Group to browse lists we can
3221	* re-enable this.
3222	*/
3223
3224	#if 0
3225	ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3226	if (ace && !ace->perms) {
3227	DLIST_REMOVE(dir_ace, ace);
3228	SAFE_FREE(ace);
3229	}
3230	#endif
3231
3232	ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3233	if (ace && !ace->perms) {
3234	DLIST_REMOVE(file_ace, ace);
3235	SAFE_FREE(ace);
3236	}
3237	}
3238
3239	num_acls = count_canon_ace_list(file_ace);
3240	num_def_acls = count_canon_ace_list(dir_ace);
3241
3242	/* Allocate the ace list. */
3243	if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3244	DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3245	goto done;
3246	}
3247
3248	memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3249
3250	/*
3251	* Create the NT ACE list from the canonical ace lists.
3252	*/
3253
3254	for (ace = file_ace; ace != NULL; ace = ace->next) {
3255	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3256	&nt_acl_type,
3257	ace->perms,
3258	S_ISDIR(sbuf->st_ex_mode));
3259	init_sec_ace(&nt_ace_list[num_aces++],
3260	&ace->trustee,
3261	nt_acl_type,
3262	acc,
3263	ace->ace_flags);
3264	}
3265
3266	/* The User must have access to a profile share - even
3267	* if we can't map the SID. */
3268	if (lp_profile_acls(SNUM(conn))) {
3269	add_or_replace_ace(nt_ace_list, &num_aces,
3270	&global_sid_Builtin_Users,
3271	SEC_ACE_TYPE_ACCESS_ALLOWED,
3272	FILE_GENERIC_ALL, 0);
3273	}
3274
3275	for (ace = dir_ace; ace != NULL; ace = ace->next) {
3276	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3277	&nt_acl_type,
3278	ace->perms,
3279	S_ISDIR(sbuf->st_ex_mode));
3280	init_sec_ace(&nt_ace_list[num_aces++],
3281	&ace->trustee,
3282	nt_acl_type,
3283	acc,
3284	ace->ace_flags \|
3285	SEC_ACE_FLAG_OBJECT_INHERIT\|
3286	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3287	SEC_ACE_FLAG_INHERIT_ONLY);
3288	}
3289
3290	/* The User must have access to a profile share - even
3291	* if we can't map the SID. */
3292	if (lp_profile_acls(SNUM(conn))) {
3293	add_or_replace_ace(nt_ace_list, &num_aces,
3294	&global_sid_Builtin_Users,
3295	SEC_ACE_TYPE_ACCESS_ALLOWED,
3296	FILE_GENERIC_ALL,
3297	SEC_ACE_FLAG_OBJECT_INHERIT \|
3298	SEC_ACE_FLAG_CONTAINER_INHERIT \|
3299	SEC_ACE_FLAG_INHERIT_ONLY);
3300	}
3301
3302	/*
3303	* Merge POSIX default ACLs and normal ACLs into one NT ACE.
3304	* Win2K needs this to get the inheritance correct when replacing ACLs
3305	* on a directory tree. Based on work by Jim @ IBM.
3306	*/
3307
3308	num_aces = merge_default_aces(nt_ace_list, num_aces);
3309
3310	if (lp_profile_acls(SNUM(conn))) {
3311	for (i = 0; i < num_aces; i++) {
3312	if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3313	add_or_replace_ace(nt_ace_list, &num_aces,
3314	&orig_owner_sid,
3315	nt_ace_list[i].type,
3316	nt_ace_list[i].access_mask,
3317	nt_ace_list[i].flags);
3318	break;
3319	}
3320	}
3321	}
3322	}
3323
3324	if (num_aces) {
3325	if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3326	DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3327	goto done;
3328	}
3329	}
3330	} /* security_info & DACL_SECURITY_INFORMATION */
3331
3332	psd = make_standard_sec_desc( talloc_tos(),
3333	(security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3334	(security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3335	psa,
3336	&sd_size);
3337
3338	if(!psd) {
3339	DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3340	sd_size = 0;
3341	goto done;
3342	}
3343
3344	/*
3345	* Windows 2000: The DACL_PROTECTED flag in the security
3346	* descriptor marks the ACL as non-inheriting, i.e., no
3347	* ACEs from higher level directories propagate to this
3348	* ACL. In the POSIX ACL model permissions are only
3349	* inherited at file create time, so ACLs never contain
3350	* any ACEs that are inherited dynamically. The DACL_PROTECTED
3351	* flag doesn't seem to bother Windows NT.
3352	* Always set this if map acl inherit is turned off.
3353	*/
3354	if (pal == NULL \|\| !lp_map_acl_inherit(SNUM(conn))) {
3355	psd->type \|= SEC_DESC_DACL_PROTECTED;
3356	} else {
3357	psd->type \|= pal->sd_type;
3358	}
3359
3360	if (psd->dacl) {
3361	dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3362	}
3363
3364	*ppdesc = psd;
3365
3366	done:
3367
3368	if (posix_acl) {
3369	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3370	}
3371	if (def_acl) {
3372	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3373	}
3374	free_canon_ace_list(file_ace);
3375	free_canon_ace_list(dir_ace);
3376	free_inherited_info(pal);
3377	SAFE_FREE(nt_ace_list);
3378
3379	return NT_STATUS_OK;
3380	}
3381
3382	NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3383	SEC_DESC **ppdesc)
3384	{
3385	SMB_STRUCT_STAT sbuf;
3386	SMB_ACL_T posix_acl = NULL;
3387	struct pai_val *pal;
3388
3389	*ppdesc = NULL;
3390
3391	DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3392	fsp_str_dbg(fsp)));
3393
3394	/* can it happen that fsp_name == NULL ? */
3395	if (fsp->is_directory \|\| fsp->fh->fd == -1) {
3396	return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3397	security_info, ppdesc);
3398	}
3399
3400	/* Get the stat struct for the owner info. */
3401	if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3402	return map_nt_error_from_unix(errno);
3403	}
3404
3405	/* Get the ACL from the fd. */
3406	posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3407
3408	pal = fload_inherited_info(fsp);
3409
3410	return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3411	&sbuf, pal, posix_acl, NULL,
3412	security_info, ppdesc);
3413	}
3414
3415	NTSTATUS posix_get_nt_acl(struct connection_struct conn, const char name,
3416	uint32_t security_info, SEC_DESC **ppdesc)
3417	{
3418	SMB_ACL_T posix_acl = NULL;
3419	SMB_ACL_T def_acl = NULL;
3420	struct pai_val *pal;
3421	struct smb_filename smb_fname;
3422	int ret;
3423
3424	*ppdesc = NULL;
3425
3426	DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3427
3428	ZERO_STRUCT(smb_fname);
3429	smb_fname.base_name = discard_const_p(char, name);
3430
3431	/* Get the stat struct for the owner info. */
3432	if (lp_posix_pathnames()) {
3433	ret = SMB_VFS_LSTAT(conn, &smb_fname);
3434	} else {
3435	ret = SMB_VFS_STAT(conn, &smb_fname);
3436	}
3437
3438	if (ret == -1) {
3439	return map_nt_error_from_unix(errno);
3440	}
3441
3442	/* Get the ACL from the path. */
3443	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3444
3445	/* If it's a directory get the default POSIX ACL. */
3446	if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3447	def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3448	def_acl = free_empty_sys_acl(conn, def_acl);
3449	}
3450
3451	pal = load_inherited_info(conn, name);
3452
3453	return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3454	posix_acl, def_acl, security_info,
3455	ppdesc);
3456	}
3457
3458	/****************************************************************************
3459	Try to chown a file. We will be able to chown it under the following conditions.
3460
3461	1) If we have root privileges, then it will just work.
3462	2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3463	3) If we have SeRestorePrivilege we can change the user to any other user.
3464	4) If we have write permission to the file and dos_filemodes is set
3465	then allow chown to the currently authenticated user.
3466	****************************************************************************/
3467
3468	int try_chown(connection_struct conn, struct smb_filename smb_fname,
3469	uid_t uid, gid_t gid)
3470	{
3471	int ret;
3472	files_struct *fsp;
3473
3474	if(!CAN_WRITE(conn)) {
3475	return -1;
3476	}
3477
3478	/* Case (1). */
3479	/* try the direct way first */
3480	if (lp_posix_pathnames()) {
3481	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3482	} else {
3483	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3484	}
3485
3486	if (ret == 0)
3487	return 0;
3488
3489	/* Case (2) / (3) */
3490	if (lp_enable_privileges()) {
3491
3492	bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3493	&se_take_ownership);
3494	bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3495	&se_restore);
3496
3497	/* Case (2) */
3498	if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) \|\|
3499	/* Case (3) */
3500	( has_restore_priv ) ) {
3501
3502	become_root();
3503	/* Keep the current file gid the same - take ownership doesn't imply group change. */
3504	if (lp_posix_pathnames()) {
3505	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3506	(gid_t)-1);
3507	} else {
3508	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3509	(gid_t)-1);
3510	}
3511	unbecome_root();
3512	return ret;
3513	}
3514	}
3515
3516	/* Case (4). */
3517	if (!lp_dos_filemode(SNUM(conn))) {
3518	errno = EPERM;
3519	return -1;
3520	}
3521
3522	/* only allow chown to the current user. This is more secure,
3523	and also copes with the case where the SID in a take ownership ACL is
3524	a local SID on the users workstation
3525	*/
3526	if (uid != current_user.ut.uid) {
3527	errno = EPERM;
3528	return -1;
3529	}
3530
3531	if (lp_posix_pathnames()) {
3532	ret = SMB_VFS_LSTAT(conn, smb_fname);
3533	} else {
3534	ret = SMB_VFS_STAT(conn, smb_fname);
3535	}
3536
3537	if (ret == -1) {
3538	return -1;
3539	}
3540
3541	if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3542	return -1;
3543	}
3544
3545	become_root();
3546	/* Keep the current file gid the same. */
3547	if (fsp->fh->fd == -1) {
3548	if (lp_posix_pathnames()) {
3549	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3550	(gid_t)-1);
3551	} else {
3552	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3553	(gid_t)-1);
3554	}
3555	} else {
3556	ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3557	}
3558	unbecome_root();
3559
3560	close_file(NULL, fsp, NORMAL_CLOSE);
3561
3562	return ret;
3563	}
3564
3565	#if 0
3566	/* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3567
3568	/****************************************************************************
3569	Take care of parent ACL inheritance.
3570	****************************************************************************/
3571
3572	NTSTATUS append_parent_acl(files_struct *fsp,
3573	const SEC_DESC *pcsd,
3574	SEC_DESC **pp_new_sd)
3575	{
3576	struct smb_filename *smb_dname = NULL;
3577	SEC_DESC *parent_sd = NULL;
3578	files_struct *parent_fsp = NULL;
3579	TALLOC_CTX *mem_ctx = talloc_tos();
3580	char *parent_name = NULL;
3581	SEC_ACE *new_ace = NULL;
3582	unsigned int num_aces = pcsd->dacl->num_aces;
3583	NTSTATUS status;
3584	int info;
3585	unsigned int i, j;
3586	SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3587	bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3588
3589	if (psd == NULL) {
3590	return NT_STATUS_NO_MEMORY;
3591	}
3592
3593	if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3594	NULL)) {
3595	return NT_STATUS_NO_MEMORY;
3596	}
3597
3598	status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3599	&smb_dname);
3600	if (!NT_STATUS_IS_OK(status)) {
3601	goto fail;
3602	}
3603
3604	status = SMB_VFS_CREATE_FILE(
3605	fsp->conn, /* conn */
3606	NULL, /* req */
3607	0, /* root_dir_fid */
3608	smb_dname, /* fname */
3609	FILE_READ_ATTRIBUTES, /* access_mask */
3610	FILE_SHARE_NONE, /* share_access */
3611	FILE_OPEN, /* create_disposition*/
3612	FILE_DIRECTORY_FILE, /* create_options */
3613	0, /* file_attributes */
3614	INTERNAL_OPEN_ONLY, /* oplock_request */
3615	0, /* allocation_size */
3616	NULL, /* sd */
3617	NULL, /* ea_list */
3618	&parent_fsp, /* result */
3619	&info); /* pinfo */
3620
3621	if (!NT_STATUS_IS_OK(status)) {
3622	TALLOC_FREE(smb_dname);
3623	return status;
3624	}
3625
3626	status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3627	DACL_SECURITY_INFORMATION, &parent_sd );
3628
3629	close_file(NULL, parent_fsp, NORMAL_CLOSE);
3630	TALLOC_FREE(smb_dname);
3631
3632	if (!NT_STATUS_IS_OK(status)) {
3633	return status;
3634	}
3635
3636	/*
3637	* Make room for potentially all the ACLs from
3638	* the parent. We used to add the ugw triple here,
3639	* as we knew we were dealing with POSIX ACLs.
3640	* We no longer need to do so as we can guarentee
3641	* that a default ACL from the parent directory will
3642	* be well formed for POSIX ACLs if it came from a
3643	* POSIX ACL source, and if we're not writing to a
3644	* POSIX ACL sink then we don't care if it's not well
3645	* formed. JRA.
3646	*/
3647
3648	num_aces += parent_sd->dacl->num_aces;
3649
3650	if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3651	num_aces)) == NULL) {
3652	return NT_STATUS_NO_MEMORY;
3653	}
3654
3655	/* Start by copying in all the given ACE entries. */
3656	for (i = 0; i < psd->dacl->num_aces; i++) {
3657	sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3658	}
3659
3660	/*
3661	* Note that we're ignoring "inherit permissions" here
3662	* as that really only applies to newly created files. JRA.
3663	*/
3664
3665	/* Finally append any inherited ACEs. */
3666	for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3667	SEC_ACE *se = &parent_sd->dacl->aces[j];
3668
3669	if (fsp->is_directory) {
3670	if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3671	/* Doesn't apply to a directory - ignore. */
3672	DEBUG(10,("append_parent_acl: directory %s "
3673	"ignoring non container "
3674	"inherit flags %u on ACE with sid %s "
3675	"from parent %s\n",
3676	fsp_str_dbg(fsp),
3677	(unsigned int)se->flags,
3678	sid_string_dbg(&se->trustee),
3679	parent_name));
3680	continue;
3681	}
3682	} else {
3683	if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3684	/* Doesn't apply to a file - ignore. */
3685	DEBUG(10,("append_parent_acl: file %s "
3686	"ignoring non object "
3687	"inherit flags %u on ACE with sid %s "
3688	"from parent %s\n",
3689	fsp_str_dbg(fsp),
3690	(unsigned int)se->flags,
3691	sid_string_dbg(&se->trustee),
3692	parent_name));
3693	continue;
3694	}
3695	}
3696
3697	if (is_dacl_protected) {
3698	/* If the DACL is protected it means we must
3699	* not overwrite an existing ACE entry with the
3700	* same SID. This is order N^2. Ouch :-(. JRA. */
3701	unsigned int k;
3702	for (k = 0; k < psd->dacl->num_aces; k++) {
3703	if (sid_equal(&psd->dacl->aces[k].trustee,
3704	&se->trustee)) {
3705	break;
3706	}
3707	}
3708	if (k < psd->dacl->num_aces) {
3709	/* SID matched. Ignore. */
3710	DEBUG(10,("append_parent_acl: path %s "
3711	"ignoring ACE with protected sid %s "
3712	"from parent %s\n",
3713	fsp_str_dbg(fsp),
3714	sid_string_dbg(&se->trustee),
3715	parent_name));
3716	continue;
3717	}
3718	}
3719
3720	sec_ace_copy(&new_ace[i], se);
3721	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3722	new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3723	}
3724	new_ace[i].flags \|= SEC_ACE_FLAG_INHERITED_ACE;
3725
3726	if (fsp->is_directory) {
3727	/*
3728	* Strip off any inherit only. It's applied.
3729	*/
3730	new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3731	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3732	/* No further inheritance. */
3733	new_ace[i].flags &=
3734	~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3735	SEC_ACE_FLAG_OBJECT_INHERIT);
3736	}
3737	} else {
3738	/*
3739	* Strip off any container or inherit
3740	* flags, they can't apply to objects.
3741	*/
3742	new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3743	SEC_ACE_FLAG_INHERIT_ONLY\|
3744	SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3745	}
3746	i++;
3747
3748	DEBUG(10,("append_parent_acl: path %s "
3749	"inheriting ACE with sid %s "
3750	"from parent %s\n",
3751	fsp_str_dbg(fsp),
3752	sid_string_dbg(&se->trustee),
3753	parent_name));
3754	}
3755
3756	psd->dacl->aces = new_ace;
3757	psd->dacl->num_aces = i;
3758	psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED\|
3759	SE_DESC_DACL_AUTO_INHERIT_REQ);
3760
3761	*pp_new_sd = psd;
3762	return status;
3763	}
3764	#endif
3765
3766	/****************************************************************************
3767	Reply to set a security descriptor on an fsp. security_info_sent is the
3768	description of the following NT ACL.
3769	This should be the only external function needed for the UNIX style set ACL.
3770	****************************************************************************/
3771
3772	NTSTATUS set_nt_acl(files_struct fsp, uint32 security_info_sent, const SEC_DESC psd_orig)
3773	{
3774	connection_struct *conn = fsp->conn;
3775	uid_t user = (uid_t)-1;
3776	gid_t grp = (gid_t)-1;
3777	DOM_SID file_owner_sid;
3778	DOM_SID file_grp_sid;
3779	canon_ace *file_ace_list = NULL;
3780	canon_ace *dir_ace_list = NULL;
3781	bool acl_perms = False;
3782	mode_t orig_mode = (mode_t)0;
3783	NTSTATUS status;
3784	bool set_acl_as_root = false;
3785	bool acl_set_support = false;
3786	bool ret = false;
3787	SEC_DESC *psd = NULL;
3788
3789	DEBUG(10,("set_nt_acl: called for file %s\n",
3790	fsp_str_dbg(fsp)));
3791
3792	if (!CAN_WRITE(conn)) {
3793	DEBUG(10,("set acl rejected on read-only share\n"));
3794	return NT_STATUS_MEDIA_WRITE_PROTECTED;
3795	}
3796
3797	if (!psd_orig) {
3798	return NT_STATUS_INVALID_PARAMETER;
3799	}
3800
3801	psd = dup_sec_desc(talloc_tos(), psd_orig);
3802	if (!psd) {
3803	return NT_STATUS_NO_MEMORY;
3804	}
3805
3806	/*
3807	* Get the current state of the file.
3808	*/
3809
3810	status = vfs_stat_fsp(fsp);
3811	if (!NT_STATUS_IS_OK(status)) {
3812	return status;
3813	}
3814
3815	/* Save the original element we check against. */
3816	orig_mode = fsp->fsp_name->st.st_ex_mode;
3817
3818	/*
3819	* Unpack the user/group/world id's.
3820	*/
3821
3822	/* POSIX can't cope with missing owner/group. */
3823	if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3824	security_info_sent &= ~SECINFO_OWNER;
3825	}
3826	if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3827	security_info_sent &= ~SECINFO_GROUP;
3828	}
3829
3830	status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3831	if (!NT_STATUS_IS_OK(status)) {
3832	return status;
3833	}
3834
3835	/*
3836	* Do we need to chown ? If so this must be done first as the incoming
3837	* CREATOR_OWNER acl will be relative to the new owner, not the old.
3838	* Noticed by Simo.
3839	*/
3840
3841	if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) \|\|
3842	(( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3843
3844	DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3845	fsp_str_dbg(fsp), (unsigned int)user,
3846	(unsigned int)grp));
3847
3848	if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3849	DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3850	"= %s.\n", fsp_str_dbg(fsp),
3851	(unsigned int)user, (unsigned int)grp,
3852	strerror(errno)));
3853	if (errno == EPERM) {
3854	return NT_STATUS_INVALID_OWNER;
3855	}
3856	return map_nt_error_from_unix(errno);
3857	}
3858
3859	/*
3860	* Recheck the current state of the file, which may have changed.
3861	* (suid/sgid bits, for instance)
3862	*/
3863
3864	status = vfs_stat_fsp(fsp);
3865	if (!NT_STATUS_IS_OK(status)) {
3866	return status;
3867	}
3868
3869	/* Save the original element we check against. */
3870	orig_mode = fsp->fsp_name->st.st_ex_mode;
3871
3872	/* If we successfully chowned, we know we must
3873	* be able to set the acl, so do it as root.
3874	*/
3875	set_acl_as_root = true;
3876	}
3877
3878	create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3879
3880	if((security_info_sent & SECINFO_DACL) &&
3881	(psd->type & SEC_DESC_DACL_PRESENT) &&
3882	(psd->dacl == NULL)) {
3883	SEC_ACE ace[3];
3884
3885	/* We can't have NULL DACL in POSIX.
3886	Use owner/group/Everyone -> full access. */
3887
3888	init_sec_ace(&ace[0],
3889	&file_owner_sid,
3890	SEC_ACE_TYPE_ACCESS_ALLOWED,
3891	GENERIC_ALL_ACCESS,
3892	0);
3893	init_sec_ace(&ace[1],
3894	&file_grp_sid,
3895	SEC_ACE_TYPE_ACCESS_ALLOWED,
3896	GENERIC_ALL_ACCESS,
3897	0);
3898	init_sec_ace(&ace[2],
3899	&global_sid_World,
3900	SEC_ACE_TYPE_ACCESS_ALLOWED,
3901	GENERIC_ALL_ACCESS,
3902	0);
3903	psd->dacl = make_sec_acl(talloc_tos(),
3904	NT4_ACL_REVISION,
3905	3,
3906	ace);
3907	if (psd->dacl == NULL) {
3908	return NT_STATUS_NO_MEMORY;
3909	}
3910	security_acl_map_generic(psd->dacl, &file_generic_mapping);
3911	}
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	}
4757
4758	/* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4759
4760	NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4761	const char *name,
4762	SMB_STRUCT_STAT *psbuf,
4763	SEC_DESC **ppdesc)
4764	{
4765	struct dom_sid owner_sid, group_sid;
4766	size_t size = 0;
4767	SEC_ACE aces[4];
4768	uint32_t access_mask = 0;
4769	mode_t mode = psbuf->st_ex_mode;
4770	SEC_ACL *new_dacl = NULL;
4771	int idx = 0;
4772
4773	DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4774	name, (int)mode ));
4775
4776	uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4777	gid_to_sid(&group_sid, psbuf->st_ex_gid);
4778
4779	/*
4780	We provide up to 4 ACEs
4781	- Owner
4782	- Group
4783	- Everyone
4784	- NT System
4785	*/
4786
4787	if (mode & S_IRUSR) {
4788	if (mode & S_IWUSR) {
4789	access_mask \|= SEC_RIGHTS_FILE_ALL;
4790	} else {
4791	access_mask \|= SEC_RIGHTS_FILE_READ \| SEC_FILE_EXECUTE;
4792	}
4793	}
4794	if (mode & S_IWUSR) {
4795	access_mask \|= SEC_RIGHTS_FILE_WRITE \| SEC_STD_DELETE;
4796	}
4797
4798	init_sec_ace(&aces[idx],
4799	&owner_sid,
4800	SEC_ACE_TYPE_ACCESS_ALLOWED,
4801	access_mask,
4802	0);
4803	idx++;
4804
4805	access_mask = 0;
4806	if (mode & S_IRGRP) {
4807	access_mask \|= SEC_RIGHTS_FILE_READ \| SEC_FILE_EXECUTE;
4808	}
4809	if (mode & S_IWGRP) {
4810	/* note that delete is not granted - this matches posix behaviour */
4811	access_mask \|= SEC_RIGHTS_FILE_WRITE;
4812	}
4813	if (access_mask) {
4814	init_sec_ace(&aces[idx],
4815	&group_sid,
4816	SEC_ACE_TYPE_ACCESS_ALLOWED,
4817	access_mask,
4818	0);
4819	idx++;
4820	}
4821
4822	access_mask = 0;
4823	if (mode & S_IROTH) {
4824	access_mask \|= SEC_RIGHTS_FILE_READ \| SEC_FILE_EXECUTE;
4825	}
4826	if (mode & S_IWOTH) {
4827	access_mask \|= SEC_RIGHTS_FILE_WRITE;
4828	}
4829	if (access_mask) {
4830	init_sec_ace(&aces[idx],
4831	&global_sid_World,
4832	SEC_ACE_TYPE_ACCESS_ALLOWED,
4833	access_mask,
4834	0);
4835	idx++;
4836	}
4837
4838	init_sec_ace(&aces[idx],
4839	&global_sid_System,
4840	SEC_ACE_TYPE_ACCESS_ALLOWED,
4841	SEC_RIGHTS_FILE_ALL,
4842	0);
4843	idx++;
4844
4845	new_dacl = make_sec_acl(ctx,
4846	NT4_ACL_REVISION,
4847	idx,
4848	aces);
4849
4850	if (!new_dacl) {
4851	return NT_STATUS_NO_MEMORY;
4852	}
4853
4854	*ppdesc = make_sec_desc(ctx,
4855	SECURITY_DESCRIPTOR_REVISION_1,
4856	SEC_DESC_SELF_RELATIVE\|SEC_DESC_DACL_PRESENT,
4857	&owner_sid,
4858	&group_sid,
4859	NULL,
4860	new_dacl,
4861	&size);
4862	if (!*ppdesc) {
4863	return NT_STATUS_NO_MEMORY;
4864	}
4865	return NT_STATUS_OK;
4866	}

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source: branches/samba-3.5.x/source3/smbd/posix_acls.c

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