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source: branches/samba-3.0/source/smbd/posix_acls.c@ 134

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Last change on this file since 134 was 124, checked in by Paul Smedley, 18 years ago
Update source to 3.0.28a
File size: 133.0 KB

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1	/*
2	Unix SMB/CIFS implementation.
3	SMB NT Security Descriptor / Unix permission conversion.
4	Copyright (C) Jeremy Allison 1994-2000.
5	Copyright (C) Andreas Gruenbacher 2002.
6
7	This program is free software; you can redistribute it and/or modify
8	it under the terms of the GNU General Public License as published by
9	the Free Software Foundation; either version 2 of the License, or
10	(at your option) any later version.
11
12	This program is distributed in the hope that it will be useful,
13	but WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	GNU General Public License for more details.
16
17	You should have received a copy of the GNU General Public License
18	along with this program; if not, write to the Free Software
19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20	*/
21
22	#include "includes.h"
23
24	extern struct current_user current_user;
25	extern 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	BOOL inherited;
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.
59	*
60	* \| 1 \| 1 \| 2 \| 2 \| ....
61	* +------+------+-------------+---------------------+-------------+--------------------+
62	* \| vers \| flag \| num_entries \| num_default_entries \| ..entries.. \| default_entries... \|
63	* +------+------+-------------+---------------------+-------------+--------------------+
64	*/
65
66	#define PAI_VERSION_OFFSET 0
67	#define PAI_FLAG_OFFSET 1
68	#define PAI_NUM_ENTRIES_OFFSET 2
69	#define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
70	#define PAI_ENTRIES_BASE 6
71
72	#define PAI_VERSION 1
73	#define PAI_ACL_FLAG_PROTECTED 0x1
74	#define PAI_ENTRY_LENGTH 5
75
76	/*
77	* In memory format of user.SAMBA_PAI attribute.
78	*/
79
80	struct pai_entry {
81	struct pai_entry next, prev;
82	enum ace_owner owner_type;
83	posix_id unix_ug;
84	};
85
86	struct pai_val {
87	BOOL pai_protected;
88	unsigned int num_entries;
89	struct pai_entry *entry_list;
90	unsigned int num_def_entries;
91	struct pai_entry *def_entry_list;
92	};
93
94	/************************************************************************
95	Return a uint32 of the pai_entry principal.
96	************************************************************************/
97
98	static uint32 get_pai_entry_val(struct pai_entry *paie)
99	{
100	switch (paie->owner_type) {
101	case UID_ACE:
102	DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
103	return (uint32)paie->unix_ug.uid;
104	case GID_ACE:
105	DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
106	return (uint32)paie->unix_ug.gid;
107	case WORLD_ACE:
108	default:
109	DEBUG(10,("get_pai_entry_val: world ace\n"));
110	return (uint32)-1;
111	}
112	}
113
114	/************************************************************************
115	Return a uint32 of the entry principal.
116	************************************************************************/
117
118	static uint32 get_entry_val(canon_ace *ace_entry)
119	{
120	switch (ace_entry->owner_type) {
121	case UID_ACE:
122	DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
123	return (uint32)ace_entry->unix_ug.uid;
124	case GID_ACE:
125	DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
126	return (uint32)ace_entry->unix_ug.gid;
127	case WORLD_ACE:
128	default:
129	DEBUG(10,("get_entry_val: world ace\n"));
130	return (uint32)-1;
131	}
132	}
133
134	/************************************************************************
135	Count the inherited entries.
136	************************************************************************/
137
138	static unsigned int num_inherited_entries(canon_ace *ace_list)
139	{
140	unsigned int num_entries = 0;
141
142	for (; ace_list; ace_list = ace_list->next)
143	if (ace_list->inherited)
144	num_entries++;
145	return num_entries;
146	}
147
148	/************************************************************************
149	Create the on-disk format. Caller must free.
150	************************************************************************/
151
152	static char create_pai_buf(canon_ace file_ace_list, canon_ace dir_ace_list, BOOL pai_protected, size_t store_size)
153	{
154	char *pai_buf = NULL;
155	canon_ace *ace_list = NULL;
156	char *entry_offset = NULL;
157	unsigned int num_entries = 0;
158	unsigned int num_def_entries = 0;
159
160	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
161	if (ace_list->inherited)
162	num_entries++;
163
164	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
165	if (ace_list->inherited)
166	num_def_entries++;
167
168	DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
169
170	store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)PAI_ENTRY_LENGTH);
171
172	pai_buf = (char )SMB_MALLOC(store_size);
173	if (!pai_buf) {
174	return NULL;
175	}
176
177	/* Set up the header. */
178	memset(pai_buf, '\0', PAI_ENTRIES_BASE);
179	SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
180	SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
181	SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
182	SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
183
184	entry_offset = pai_buf + PAI_ENTRIES_BASE;
185
186	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187	if (ace_list->inherited) {
188	uint8 type_val = (unsigned char)ace_list->owner_type;
189	uint32 entry_val = get_entry_val(ace_list);
190
191	SCVAL(entry_offset,0,type_val);
192	SIVAL(entry_offset,1,entry_val);
193	entry_offset += PAI_ENTRY_LENGTH;
194	}
195	}
196
197	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
198	if (ace_list->inherited) {
199	uint8 type_val = (unsigned char)ace_list->owner_type;
200	uint32 entry_val = get_entry_val(ace_list);
201
202	SCVAL(entry_offset,0,type_val);
203	SIVAL(entry_offset,1,entry_val);
204	entry_offset += PAI_ENTRY_LENGTH;
205	}
206	}
207
208	return pai_buf;
209	}
210
211	/************************************************************************
212	Store the user.SAMBA_PAI attribute on disk.
213	************************************************************************/
214
215	static void store_inheritance_attributes(files_struct fsp, canon_ace file_ace_list,
216	canon_ace *dir_ace_list, BOOL pai_protected)
217	{
218	int ret;
219	size_t store_size;
220	char *pai_buf;
221
222	if (!lp_map_acl_inherit(SNUM(fsp->conn)))
223	return;
224
225	/*
226	* Don't store if this ACL isn't protected and
227	* none of the entries in it are marked as inherited.
228	*/
229
230	if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
231	/* Instead just remove the attribute if it exists. */
232	if (fsp->fh->fd != -1)
233	SMB_VFS_FREMOVEXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME);
234	else
235	SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
236	return;
237	}
238
239	pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
240
241	if (fsp->fh->fd != -1)
242	ret = SMB_VFS_FSETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
243	pai_buf, store_size, 0);
244	else
245	ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
246	pai_buf, store_size, 0);
247
248	SAFE_FREE(pai_buf);
249
250	DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
251	if (ret == -1 && !no_acl_syscall_error(errno))
252	DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
253	}
254
255	/************************************************************************
256	Delete the in memory inheritance info.
257	************************************************************************/
258
259	static void free_inherited_info(struct pai_val *pal)
260	{
261	if (pal) {
262	struct pai_entry paie, paie_next;
263	for (paie = pal->entry_list; paie; paie = paie_next) {
264	paie_next = paie->next;
265	SAFE_FREE(paie);
266	}
267	for (paie = pal->def_entry_list; paie; paie = paie_next) {
268	paie_next = paie->next;
269	SAFE_FREE(paie);
270	}
271	SAFE_FREE(pal);
272	}
273	}
274
275	/************************************************************************
276	Was this ACL protected ?
277	************************************************************************/
278
279	static BOOL get_protected_flag(struct pai_val *pal)
280	{
281	if (!pal)
282	return False;
283	return pal->pai_protected;
284	}
285
286	/************************************************************************
287	Was this ACE inherited ?
288	************************************************************************/
289
290	static BOOL get_inherited_flag(struct pai_val pal, canon_ace ace_entry, BOOL default_ace)
291	{
292	struct pai_entry *paie;
293
294	if (!pal)
295	return False;
296
297	/* If the entry exists it is inherited. */
298	for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
299	if (ace_entry->owner_type == paie->owner_type &&
300	get_entry_val(ace_entry) == get_pai_entry_val(paie))
301	return True;
302	}
303	return False;
304	}
305
306	/************************************************************************
307	Ensure an attribute just read is valid.
308	************************************************************************/
309
310	static BOOL check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
311	{
312	uint16 num_entries;
313	uint16 num_def_entries;
314
315	if (pai_buf_data_size < PAI_ENTRIES_BASE) {
316	/* Corrupted - too small. */
317	return False;
318	}
319
320	if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
321	return False;
322
323	num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
324	num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
325
326	/* Check the entry lists match. */
327	/* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
328
329	if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
330	return False;
331
332	return True;
333	}
334
335
336	/************************************************************************
337	Convert to in-memory format.
338	************************************************************************/
339
340	static struct pai_val create_pai_val(char buf, size_t size)
341	{
342	char *entry_offset;
343	struct pai_val *paiv = NULL;
344	int i;
345
346	if (!check_pai_ok(buf, size))
347	return NULL;
348
349	paiv = SMB_MALLOC_P(struct pai_val);
350	if (!paiv)
351	return NULL;
352
353	memset(paiv, '\0', sizeof(struct pai_val));
354
355	paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
356
357	paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
358	paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
359
360	entry_offset = buf + PAI_ENTRIES_BASE;
361
362	DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
363	paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
364
365	for (i = 0; i < paiv->num_entries; i++) {
366	struct pai_entry *paie;
367
368	paie = SMB_MALLOC_P(struct pai_entry);
369	if (!paie) {
370	free_inherited_info(paiv);
371	return NULL;
372	}
373
374	paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
375	switch( paie->owner_type) {
376	case UID_ACE:
377	paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
378	DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
379	break;
380	case GID_ACE:
381	paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
382	DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
383	break;
384	case WORLD_ACE:
385	paie->unix_ug.world = -1;
386	DEBUG(10,("create_pai_val: world ace\n"));
387	break;
388	default:
389	free_inherited_info(paiv);
390	return NULL;
391	}
392	entry_offset += PAI_ENTRY_LENGTH;
393	DLIST_ADD(paiv->entry_list, paie);
394	}
395
396	for (i = 0; i < paiv->num_def_entries; i++) {
397	struct pai_entry *paie;
398
399	paie = SMB_MALLOC_P(struct pai_entry);
400	if (!paie) {
401	free_inherited_info(paiv);
402	return NULL;
403	}
404
405	paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406	switch( paie->owner_type) {
407	case UID_ACE:
408	paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
409	DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
410	break;
411	case GID_ACE:
412	paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
413	DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
414	break;
415	case WORLD_ACE:
416	paie->unix_ug.world = -1;
417	DEBUG(10,("create_pai_val: (def) world ace\n"));
418	break;
419	default:
420	free_inherited_info(paiv);
421	return NULL;
422	}
423	entry_offset += PAI_ENTRY_LENGTH;
424	DLIST_ADD(paiv->def_entry_list, paie);
425	}
426
427	return paiv;
428	}
429
430	/************************************************************************
431	Load the user.SAMBA_PAI attribute.
432	************************************************************************/
433
434	static struct pai_val load_inherited_info(files_struct fsp)
435	{
436	char *pai_buf;
437	size_t pai_buf_size = 1024;
438	struct pai_val *paiv = NULL;
439	ssize_t ret;
440
441	if (!lp_map_acl_inherit(SNUM(fsp->conn)))
442	return NULL;
443
444	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
445	return NULL;
446
447	do {
448	if (fsp->fh->fd != -1)
449	ret = SMB_VFS_FGETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
450	pai_buf, pai_buf_size);
451	else
452	ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
453	pai_buf, pai_buf_size);
454
455	if (ret == -1) {
456	if (errno != ERANGE) {
457	break;
458	}
459	/* Buffer too small - enlarge it. */
460	pai_buf_size *= 2;
461	SAFE_FREE(pai_buf);
462	if (pai_buf_size > 1024*1024) {
463	return NULL; /* Limit malloc to 1mb. */
464	}
465	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
466	return NULL;
467	}
468	} while (ret == -1);
469
470	DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
471
472	if (ret == -1) {
473	/* No attribute or not supported. */
474	#if defined(ENOATTR)
475	if (errno != ENOATTR)
476	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
477	#else
478	if (errno != ENOSYS)
479	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
480	#endif
481	SAFE_FREE(pai_buf);
482	return NULL;
483	}
484
485	paiv = create_pai_val(pai_buf, ret);
486
487	if (paiv && paiv->pai_protected)
488	DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
489
490	SAFE_FREE(pai_buf);
491	return paiv;
492	}
493
494	/****************************************************************************
495	Functions to manipulate the internal ACE format.
496	****************************************************************************/
497
498	/****************************************************************************
499	Count a linked list of canonical ACE entries.
500	****************************************************************************/
501
502	static size_t count_canon_ace_list( canon_ace *list_head )
503	{
504	size_t count = 0;
505	canon_ace *ace;
506
507	for (ace = list_head; ace; ace = ace->next)
508	count++;
509
510	return count;
511	}
512
513	/****************************************************************************
514	Free a linked list of canonical ACE entries.
515	****************************************************************************/
516
517	static void free_canon_ace_list( canon_ace *list_head )
518	{
519	canon_ace list, next;
520
521	for (list = list_head; list; list = next) {
522	next = list->next;
523	DLIST_REMOVE(list_head, list);
524	SAFE_FREE(list);
525	}
526	}
527
528	/****************************************************************************
529	Function to duplicate a canon_ace entry.
530	****************************************************************************/
531
532	static canon_ace dup_canon_ace( canon_ace src_ace)
533	{
534	canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
535
536	if (dst_ace == NULL)
537	return NULL;
538
539	dst_ace = src_ace;
540	dst_ace->prev = dst_ace->next = NULL;
541	return dst_ace;
542	}
543
544	/****************************************************************************
545	Print out a canon ace.
546	****************************************************************************/
547
548	static void print_canon_ace(canon_ace *pace, int num)
549	{
550	fstring str;
551
552	dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
553	dbgtext( "SID = %s ", sid_to_string( str, &pace->trustee));
554	if (pace->owner_type == UID_ACE) {
555	const char *u_name = uidtoname(pace->unix_ug.uid);
556	dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
557	} else if (pace->owner_type == GID_ACE) {
558	char *g_name = gidtoname(pace->unix_ug.gid);
559	dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
560	} else
561	dbgtext( "other ");
562	switch (pace->type) {
563	case SMB_ACL_USER:
564	dbgtext( "SMB_ACL_USER ");
565	break;
566	case SMB_ACL_USER_OBJ:
567	dbgtext( "SMB_ACL_USER_OBJ ");
568	break;
569	case SMB_ACL_GROUP:
570	dbgtext( "SMB_ACL_GROUP ");
571	break;
572	case SMB_ACL_GROUP_OBJ:
573	dbgtext( "SMB_ACL_GROUP_OBJ ");
574	break;
575	case SMB_ACL_OTHER:
576	dbgtext( "SMB_ACL_OTHER ");
577	break;
578	default:
579	dbgtext( "MASK " );
580	break;
581	}
582	if (pace->inherited)
583	dbgtext( "(inherited) ");
584	dbgtext( "perms ");
585	dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
586	dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
587	dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
588	}
589
590	/****************************************************************************
591	Print out a canon ace list.
592	****************************************************************************/
593
594	static void print_canon_ace_list(const char name, canon_ace ace_list)
595	{
596	int count = 0;
597
598	if( DEBUGLVL( 10 )) {
599	dbgtext( "print_canon_ace_list: %s\n", name );
600	for (;ace_list; ace_list = ace_list->next, count++)
601	print_canon_ace(ace_list, count );
602	}
603	}
604
605	/****************************************************************************
606	Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
607	****************************************************************************/
608
609	static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
610	{
611	mode_t ret = 0;
612
613	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
614	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
615	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
616
617	return ret;
618	}
619
620	/****************************************************************************
621	Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
622	****************************************************************************/
623
624	static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
625	{
626	mode_t ret = 0;
627
628	if (mode & r_mask)
629	ret \|= S_IRUSR;
630	if (mode & w_mask)
631	ret \|= S_IWUSR;
632	if (mode & x_mask)
633	ret \|= S_IXUSR;
634
635	return ret;
636	}
637
638	/****************************************************************************
639	Map canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits) to
640	an SMB_ACL_PERMSET_T.
641	****************************************************************************/
642
643	static int map_acl_perms_to_permset(connection_struct conn, mode_t mode, SMB_ACL_PERMSET_T p_permset)
644	{
645	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
646	return -1;
647	if (mode & S_IRUSR) {
648	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
649	return -1;
650	}
651	if (mode & S_IWUSR) {
652	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
653	return -1;
654	}
655	if (mode & S_IXUSR) {
656	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
657	return -1;
658	}
659	return 0;
660	}
661
662	/****************************************************************************
663	Function to create owner and group SIDs from a SMB_STRUCT_STAT.
664	****************************************************************************/
665
666	static void create_file_sids(SMB_STRUCT_STAT psbuf, DOM_SID powner_sid, DOM_SID *pgroup_sid)
667	{
668	uid_to_sid( powner_sid, psbuf->st_uid );
669	gid_to_sid( pgroup_sid, psbuf->st_gid );
670	}
671
672	/****************************************************************************
673	Is the identity in two ACEs equal ? Check both SID and uid/gid.
674	****************************************************************************/
675
676	static BOOL identity_in_ace_equal(canon_ace ace1, canon_ace ace2)
677	{
678	if (sid_equal(&ace1->trustee, &ace2->trustee)) {
679	return True;
680	}
681	if (ace1->owner_type == ace2->owner_type) {
682	if (ace1->owner_type == UID_ACE &&
683	ace1->unix_ug.uid == ace2->unix_ug.uid) {
684	return True;
685	} else if (ace1->owner_type == GID_ACE &&
686	ace1->unix_ug.gid == ace2->unix_ug.gid) {
687	return True;
688	}
689	}
690	return False;
691	}
692
693	/****************************************************************************
694	Merge aces with a common sid - if both are allow or deny, OR the permissions together and
695	delete the second one. If the first is deny, mask the permissions off and delete the allow
696	if the permissions become zero, delete the deny if the permissions are non zero.
697	****************************************************************************/
698
699	static void merge_aces( canon_ace **pp_list_head )
700	{
701	canon_ace list_head = pp_list_head;
702	canon_ace *curr_ace_outer;
703	canon_ace *curr_ace_outer_next;
704
705	/*
706	* First, merge allow entries with identical SIDs, and deny entries
707	* with identical SIDs.
708	*/
709
710	for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
711	canon_ace *curr_ace;
712	canon_ace *curr_ace_next;
713
714	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
715
716	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
717
718	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
719
720	if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
721	(curr_ace->attr == curr_ace_outer->attr)) {
722
723	if( DEBUGLVL( 10 )) {
724	dbgtext("merge_aces: Merging ACE's\n");
725	print_canon_ace( curr_ace_outer, 0);
726	print_canon_ace( curr_ace, 0);
727	}
728
729	/* Merge two allow or two deny ACE's. */
730
731	curr_ace_outer->perms \|= curr_ace->perms;
732	DLIST_REMOVE(list_head, curr_ace);
733	SAFE_FREE(curr_ace);
734	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
735	}
736	}
737	}
738
739	/*
740	* Now go through and mask off allow permissions with deny permissions.
741	* We can delete either the allow or deny here as we know that each SID
742	* appears only once in the list.
743	*/
744
745	for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
746	canon_ace *curr_ace;
747	canon_ace *curr_ace_next;
748
749	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
750
751	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
752
753	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
754
755	/*
756	* Subtract ACE's with different entries. Due to the ordering constraints
757	* we've put on the ACL, we know the deny must be the first one.
758	*/
759
760	if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
761	(curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
762
763	if( DEBUGLVL( 10 )) {
764	dbgtext("merge_aces: Masking ACE's\n");
765	print_canon_ace( curr_ace_outer, 0);
766	print_canon_ace( curr_ace, 0);
767	}
768
769	curr_ace->perms &= ~curr_ace_outer->perms;
770
771	if (curr_ace->perms == 0) {
772
773	/*
774	* The deny overrides the allow. Remove the allow.
775	*/
776
777	DLIST_REMOVE(list_head, curr_ace);
778	SAFE_FREE(curr_ace);
779	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
780
781	} else {
782
783	/*
784	* Even after removing permissions, there
785	* are still allow permissions - delete the deny.
786	* It is safe to delete the deny here,
787	* as we are guarenteed by the deny first
788	* ordering that all the deny entries for
789	* this SID have already been merged into one
790	* before we can get to an allow ace.
791	*/
792
793	DLIST_REMOVE(list_head, curr_ace_outer);
794	SAFE_FREE(curr_ace_outer);
795	break;
796	}
797	}
798
799	} /* end for curr_ace */
800	} /* end for curr_ace_outer */
801
802	/* We may have modified the list. */
803
804	*pp_list_head = list_head;
805	}
806
807	/****************************************************************************
808	Check if we need to return NT4.x compatible ACL entries.
809	****************************************************************************/
810
811	static BOOL nt4_compatible_acls(void)
812	{
813	int compat = lp_acl_compatibility();
814
815	if (compat == ACL_COMPAT_AUTO) {
816	enum remote_arch_types ra_type = get_remote_arch();
817
818	/* Automatically adapt to client */
819	return (ra_type <= RA_WINNT);
820	} else
821	return (compat == ACL_COMPAT_WINNT);
822	}
823
824
825	/****************************************************************************
826	Map canon_ace perms to permission bits NT.
827	The attr element is not used here - we only process deny entries on set,
828	not get. Deny entries are implicit on get with ace->perms = 0.
829	****************************************************************************/
830
831	static SEC_ACCESS map_canon_ace_perms(int snum,
832	int *pacl_type,
833	mode_t perms,
834	BOOL directory_ace)
835	{
836	SEC_ACCESS sa;
837	uint32 nt_mask = 0;
838
839	*pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
840
841	if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
842	if (directory_ace) {
843	nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
844	} else {
845	nt_mask = UNIX_ACCESS_RWX;
846	}
847	} else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
848	/*
849	* Windows NT refuses to display ACEs with no permissions in them (but
850	* they are perfectly legal with Windows 2000). If the ACE has empty
851	* permissions we cannot use 0, so we use the otherwise unused
852	* WRITE_OWNER permission, which we ignore when we set an ACL.
853	* We abstract this into a #define of UNIX_ACCESS_NONE to allow this
854	* to be changed in the future.
855	*/
856
857	if (nt4_compatible_acls())
858	nt_mask = UNIX_ACCESS_NONE;
859	else
860	nt_mask = 0;
861	} else {
862	if (directory_ace) {
863	nt_mask \|= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
864	nt_mask \|= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
865	nt_mask \|= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
866	} else {
867	nt_mask \|= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
868	nt_mask \|= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
869	nt_mask \|= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
870	}
871	}
872
873	DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
874	(unsigned int)perms, (unsigned int)nt_mask ));
875
876	init_sec_access(&sa,nt_mask);
877	return sa;
878	}
879
880	/****************************************************************************
881	Map NT perms to a UNIX mode_t.
882	****************************************************************************/
883
884	#define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA\|FILE_READ_EA\|FILE_READ_ATTRIBUTES)
885	#define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA\|FILE_APPEND_DATA\|FILE_WRITE_EA\|FILE_WRITE_ATTRIBUTES)
886	#define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
887
888	static mode_t map_nt_perms( uint32 *mask, int type)
889	{
890	mode_t mode = 0;
891
892	switch(type) {
893	case S_IRUSR:
894	if((*mask) & GENERIC_ALL_ACCESS)
895	mode = S_IRUSR\|S_IWUSR\|S_IXUSR;
896	else {
897	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
898	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
899	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
900	}
901	break;
902	case S_IRGRP:
903	if((*mask) & GENERIC_ALL_ACCESS)
904	mode = S_IRGRP\|S_IWGRP\|S_IXGRP;
905	else {
906	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
907	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
908	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
909	}
910	break;
911	case S_IROTH:
912	if((*mask) & GENERIC_ALL_ACCESS)
913	mode = S_IROTH\|S_IWOTH\|S_IXOTH;
914	else {
915	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
916	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
917	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
918	}
919	break;
920	}
921
922	return mode;
923	}
924
925	/****************************************************************************
926	Unpack a SEC_DESC into a UNIX owner and group.
927	****************************************************************************/
928
929	BOOL unpack_nt_owners(int snum, uid_t puser, gid_t pgrp, uint32 security_info_sent, SEC_DESC *psd)
930	{
931	DOM_SID owner_sid;
932	DOM_SID grp_sid;
933
934	*puser = (uid_t)-1;
935	*pgrp = (gid_t)-1;
936
937	if(security_info_sent == 0) {
938	DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
939	return True;
940	}
941
942	/*
943	* Validate the owner and group SID's.
944	*/
945
946	memset(&owner_sid, '\0', sizeof(owner_sid));
947	memset(&grp_sid, '\0', sizeof(grp_sid));
948
949	DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
950
951	/*
952	* Don't immediately fail if the owner sid cannot be validated.
953	* This may be a group chown only set.
954	*/
955
956	if (security_info_sent & OWNER_SECURITY_INFORMATION) {
957	sid_copy(&owner_sid, psd->owner_sid);
958	if (!sid_to_uid(&owner_sid, puser)) {
959	if (lp_force_unknown_acl_user(snum)) {
960	/* this allows take ownership to work
961	* reasonably */
962	*puser = current_user.ut.uid;
963	} else {
964	DEBUG(3,("unpack_nt_owners: unable to validate"
965	" owner sid for %s\n",
966	sid_string_static(&owner_sid)));
967	return False;
968	}
969	}
970	}
971
972	/*
973	* Don't immediately fail if the group sid cannot be validated.
974	* This may be an owner chown only set.
975	*/
976
977	if (security_info_sent & GROUP_SECURITY_INFORMATION) {
978	sid_copy(&grp_sid, psd->group_sid);
979	if (!sid_to_gid( &grp_sid, pgrp)) {
980	if (lp_force_unknown_acl_user(snum)) {
981	/* this allows take group ownership to work
982	* reasonably */
983	*pgrp = current_user.ut.gid;
984	} else {
985	DEBUG(3,("unpack_nt_owners: unable to validate"
986	" group sid.\n"));
987	return False;
988	}
989	}
990	}
991
992	DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
993
994	return True;
995	}
996
997	/****************************************************************************
998	Ensure the enforced permissions for this share apply.
999	****************************************************************************/
1000
1001	static void apply_default_perms(files_struct fsp, canon_ace pace, mode_t type)
1002	{
1003	int snum = SNUM(fsp->conn);
1004	mode_t and_bits = (mode_t)0;
1005	mode_t or_bits = (mode_t)0;
1006
1007	/* Get the initial bits to apply. */
1008
1009	if (fsp->is_directory) {
1010	and_bits = lp_dir_security_mask(snum);
1011	or_bits = lp_force_dir_security_mode(snum);
1012	} else {
1013	and_bits = lp_security_mask(snum);
1014	or_bits = lp_force_security_mode(snum);
1015	}
1016
1017	/* Now bounce them into the S_USR space. */
1018	switch(type) {
1019	case S_IRUSR:
1020	/* Ensure owner has read access. */
1021	pace->perms \|= S_IRUSR;
1022	if (fsp->is_directory)
1023	pace->perms \|= (S_IWUSR\|S_IXUSR);
1024	and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1025	or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1026	break;
1027	case S_IRGRP:
1028	and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1029	or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1030	break;
1031	case S_IROTH:
1032	and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1033	or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1034	break;
1035	}
1036
1037	pace->perms = ((pace->perms & and_bits)\|or_bits);
1038	}
1039
1040	/****************************************************************************
1041	Check if a given uid/SID is in a group gid/SID. This is probably very
1042	expensive and will need optimisation. A lot of optimisation :-). JRA.
1043	****************************************************************************/
1044
1045	static BOOL uid_entry_in_group( canon_ace uid_ace, canon_ace group_ace )
1046	{
1047	fstring u_name;
1048
1049	/* "Everyone" always matches every uid. */
1050
1051	if (sid_equal(&group_ace->trustee, &global_sid_World))
1052	return True;
1053
1054	/* Assume that the current user is in the current group (force group) */
1055
1056	if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1057	return True;
1058
1059	fstrcpy(u_name, uidtoname(uid_ace->unix_ug.uid));
1060	return user_in_group_sid(u_name, &group_ace->trustee);
1061	}
1062
1063	/****************************************************************************
1064	A well formed POSIX file or default ACL has at least 3 entries, a
1065	SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1066	In addition, the owner must always have at least read access.
1067	When using this call on get_acl, the pst struct is valid and contains
1068	the mode of the file. When using this call on set_acl, the pst struct has
1069	been modified to have a mode containing the default for this file or directory
1070	type.
1071	****************************************************************************/
1072
1073	static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
1074	files_struct *fsp,
1075	const DOM_SID *pfile_owner_sid,
1076	const DOM_SID *pfile_grp_sid,
1077	SMB_STRUCT_STAT *pst,
1078	BOOL setting_acl)
1079	{
1080	canon_ace *pace;
1081	BOOL got_user = False;
1082	BOOL got_grp = False;
1083	BOOL got_other = False;
1084	canon_ace *pace_other = NULL;
1085
1086	for (pace = *pp_ace; pace; pace = pace->next) {
1087	if (pace->type == SMB_ACL_USER_OBJ) {
1088
1089	if (setting_acl)
1090	apply_default_perms(fsp, pace, S_IRUSR);
1091	got_user = True;
1092
1093	} else if (pace->type == SMB_ACL_GROUP_OBJ) {
1094
1095	/*
1096	* Ensure create mask/force create mode is respected on set.
1097	*/
1098
1099	if (setting_acl)
1100	apply_default_perms(fsp, pace, S_IRGRP);
1101	got_grp = True;
1102
1103	} else if (pace->type == SMB_ACL_OTHER) {
1104
1105	/*
1106	* Ensure create mask/force create mode is respected on set.
1107	*/
1108
1109	if (setting_acl)
1110	apply_default_perms(fsp, pace, S_IROTH);
1111	got_other = True;
1112	pace_other = pace;
1113	}
1114	}
1115
1116	if (!got_user) {
1117	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1118	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1119	return False;
1120	}
1121
1122	ZERO_STRUCTP(pace);
1123	pace->type = SMB_ACL_USER_OBJ;
1124	pace->owner_type = UID_ACE;
1125	pace->unix_ug.uid = pst->st_uid;
1126	pace->trustee = *pfile_owner_sid;
1127	pace->attr = ALLOW_ACE;
1128
1129	if (setting_acl) {
1130	/* See if the owning user is in any of the other groups in
1131	the ACE. If so, OR in the permissions from that group. */
1132
1133	BOOL group_matched = False;
1134	canon_ace *pace_iter;
1135
1136	for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1137	if (pace_iter->type == SMB_ACL_GROUP_OBJ \|\| pace_iter->type == SMB_ACL_GROUP) {
1138	if (uid_entry_in_group(pace, pace_iter)) {
1139	pace->perms \|= pace_iter->perms;
1140	group_matched = True;
1141	}
1142	}
1143	}
1144
1145	/* If we only got an "everyone" perm, just use that. */
1146	if (!group_matched) {
1147	if (got_other)
1148	pace->perms = pace_other->perms;
1149	else
1150	pace->perms = 0;
1151	}
1152
1153	apply_default_perms(fsp, pace, S_IRUSR);
1154	} else {
1155	pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1156	}
1157
1158	DLIST_ADD(*pp_ace, pace);
1159	}
1160
1161	if (!got_grp) {
1162	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1163	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1164	return False;
1165	}
1166
1167	ZERO_STRUCTP(pace);
1168	pace->type = SMB_ACL_GROUP_OBJ;
1169	pace->owner_type = GID_ACE;
1170	pace->unix_ug.uid = pst->st_gid;
1171	pace->trustee = *pfile_grp_sid;
1172	pace->attr = ALLOW_ACE;
1173	if (setting_acl) {
1174	/* If we only got an "everyone" perm, just use that. */
1175	if (got_other)
1176	pace->perms = pace_other->perms;
1177	else
1178	pace->perms = 0;
1179	apply_default_perms(fsp, pace, S_IRGRP);
1180	} else {
1181	pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1182	}
1183
1184	DLIST_ADD(*pp_ace, pace);
1185	}
1186
1187	if (!got_other) {
1188	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1189	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1190	return False;
1191	}
1192
1193	ZERO_STRUCTP(pace);
1194	pace->type = SMB_ACL_OTHER;
1195	pace->owner_type = WORLD_ACE;
1196	pace->unix_ug.world = -1;
1197	pace->trustee = global_sid_World;
1198	pace->attr = ALLOW_ACE;
1199	if (setting_acl) {
1200	pace->perms = 0;
1201	apply_default_perms(fsp, pace, S_IROTH);
1202	} else
1203	pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1204
1205	DLIST_ADD(*pp_ace, pace);
1206	}
1207
1208	return True;
1209	}
1210
1211	/****************************************************************************
1212	Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1213	If it does not have them, check if there are any entries where the trustee is the
1214	file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1215	****************************************************************************/
1216
1217	static void check_owning_objs(canon_ace ace, DOM_SID pfile_owner_sid, DOM_SID *pfile_grp_sid)
1218	{
1219	BOOL got_user_obj, got_group_obj;
1220	canon_ace *current_ace;
1221	int i, entries;
1222
1223	entries = count_canon_ace_list(ace);
1224	got_user_obj = False;
1225	got_group_obj = False;
1226
1227	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1228	if (current_ace->type == SMB_ACL_USER_OBJ)
1229	got_user_obj = True;
1230	else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1231	got_group_obj = True;
1232	}
1233	if (got_user_obj && got_group_obj) {
1234	DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1235	return;
1236	}
1237
1238	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1239	if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1240	sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1241	current_ace->type = SMB_ACL_USER_OBJ;
1242	got_user_obj = True;
1243	}
1244	if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1245	sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1246	current_ace->type = SMB_ACL_GROUP_OBJ;
1247	got_group_obj = True;
1248	}
1249	}
1250	if (!got_user_obj)
1251	DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1252	if (!got_group_obj)
1253	DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1254	}
1255
1256	/****************************************************************************
1257	Unpack a SEC_DESC into two canonical ace lists.
1258	****************************************************************************/
1259
1260	static BOOL create_canon_ace_lists(files_struct fsp, SMB_STRUCT_STAT pst,
1261	DOM_SID *pfile_owner_sid,
1262	DOM_SID *pfile_grp_sid,
1263	canon_ace ppfile_ace, canon_ace ppdir_ace,
1264	SEC_ACL *dacl)
1265	{
1266	BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1267	canon_ace *file_ace = NULL;
1268	canon_ace *dir_ace = NULL;
1269	canon_ace *current_ace = NULL;
1270	BOOL got_dir_allow = False;
1271	BOOL got_file_allow = False;
1272	int i, j;
1273
1274	*ppfile_ace = NULL;
1275	*ppdir_ace = NULL;
1276
1277	/*
1278	* Convert the incoming ACL into a more regular form.
1279	*/
1280
1281	for(i = 0; i < dacl->num_aces; i++) {
1282	SEC_ACE *psa = &dacl->aces[i];
1283
1284	if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1285	DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1286	return False;
1287	}
1288
1289	if (nt4_compatible_acls()) {
1290	/*
1291	* The security mask may be UNIX_ACCESS_NONE which should map into
1292	* no permissions (we overload the WRITE_OWNER bit for this) or it
1293	* should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1294	* to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1295	*/
1296
1297	/*
1298	* Convert GENERIC bits to specific bits.
1299	*/
1300
1301	se_map_generic(&psa->access_mask, &file_generic_mapping);
1302
1303	psa->access_mask &= (UNIX_ACCESS_NONE\|FILE_ALL_ACCESS);
1304
1305	if(psa->access_mask != UNIX_ACCESS_NONE)
1306	psa->access_mask &= ~UNIX_ACCESS_NONE;
1307	}
1308	}
1309
1310	/*
1311	* Deal with the fact that NT 4.x re-writes the canonical format
1312	* that we return for default ACLs. If a directory ACE is identical
1313	* to a inherited directory ACE then NT changes the bits so that the
1314	* first ACE is set to OI\|IO and the second ACE for this SID is set
1315	* to CI. We need to repair this. JRA.
1316	*/
1317
1318	for(i = 0; i < dacl->num_aces; i++) {
1319	SEC_ACE *psa1 = &dacl->aces[i];
1320
1321	for (j = i + 1; j < dacl->num_aces; j++) {
1322	SEC_ACE *psa2 = &dacl->aces[j];
1323
1324	if (psa1->access_mask != psa2->access_mask)
1325	continue;
1326
1327	if (!sid_equal(&psa1->trustee, &psa2->trustee))
1328	continue;
1329
1330	/*
1331	* Ok - permission bits and SIDs are equal.
1332	* Check if flags were re-written.
1333	*/
1334
1335	if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1336
1337	psa1->flags \|= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1338	psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1339
1340	} else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1341
1342	psa2->flags \|= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1343	psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1344
1345	}
1346	}
1347	}
1348
1349	for(i = 0; i < dacl->num_aces; i++) {
1350	SEC_ACE *psa = &dacl->aces[i];
1351
1352	/*
1353	* Create a cannon_ace entry representing this NT DACL ACE.
1354	*/
1355
1356	if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1357	free_canon_ace_list(file_ace);
1358	free_canon_ace_list(dir_ace);
1359	DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1360	return False;
1361	}
1362
1363	ZERO_STRUCTP(current_ace);
1364
1365	sid_copy(&current_ace->trustee, &psa->trustee);
1366
1367	/*
1368	* Try and work out if the SID is a user or group
1369	* as we need to flag these differently for POSIX.
1370	* Note what kind of a POSIX ACL this should map to.
1371	*/
1372
1373	if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1374	current_ace->owner_type = WORLD_ACE;
1375	current_ace->unix_ug.world = -1;
1376	current_ace->type = SMB_ACL_OTHER;
1377	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1378	current_ace->owner_type = UID_ACE;
1379	current_ace->unix_ug.uid = pst->st_uid;
1380	current_ace->type = SMB_ACL_USER_OBJ;
1381
1382	/*
1383	* The Creator Owner entry only specifies inheritable permissions,
1384	* never access permissions. WinNT doesn't always set the ACE to
1385	*INHERIT_ONLY, though.
1386	*/
1387
1388	if (nt4_compatible_acls())
1389	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1390	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1391	current_ace->owner_type = GID_ACE;
1392	current_ace->unix_ug.gid = pst->st_gid;
1393	current_ace->type = SMB_ACL_GROUP_OBJ;
1394
1395	/*
1396	* The Creator Group entry only specifies inheritable permissions,
1397	* never access permissions. WinNT doesn't always set the ACE to
1398	*INHERIT_ONLY, though.
1399	*/
1400	if (nt4_compatible_acls())
1401	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1402
1403	} else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1404	current_ace->owner_type = UID_ACE;
1405	/* If it's the owning user, this is a user_obj, not
1406	* a user. */
1407	if (current_ace->unix_ug.uid == pst->st_uid) {
1408	current_ace->type = SMB_ACL_USER_OBJ;
1409	} else {
1410	current_ace->type = SMB_ACL_USER;
1411	}
1412	} else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1413	current_ace->owner_type = GID_ACE;
1414	/* If it's the primary group, this is a group_obj, not
1415	* a group. */
1416	if (current_ace->unix_ug.gid == pst->st_gid) {
1417	current_ace->type = SMB_ACL_GROUP_OBJ;
1418	} else {
1419	current_ace->type = SMB_ACL_GROUP;
1420	}
1421	} else {
1422	fstring str;
1423
1424	/*
1425	* Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1426	*/
1427
1428	if (non_mappable_sid(&psa->trustee)) {
1429	DEBUG(10,("create_canon_ace_lists: ignoring non-mappable SID %s\n",
1430	sid_to_string(str, &psa->trustee) ));
1431	SAFE_FREE(current_ace);
1432	continue;
1433	}
1434
1435	free_canon_ace_list(file_ace);
1436	free_canon_ace_list(dir_ace);
1437	DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
1438	sid_to_string(str, &current_ace->trustee) ));
1439	SAFE_FREE(current_ace);
1440	return False;
1441	}
1442
1443	/*
1444	* Map the given NT permissions into a UNIX mode_t containing only
1445	* S_I(R\|W\|X)USR bits.
1446	*/
1447
1448	current_ace->perms \|= map_nt_perms( &psa->access_mask, S_IRUSR);
1449	current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1450	current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1451
1452	/*
1453	* Now add the created ace to either the file list, the directory
1454	* list, or both. We MUST preserve the order here (hence we use
1455	* DLIST_ADD_END) as NT ACLs are order dependent.
1456	*/
1457
1458	if (fsp->is_directory) {
1459
1460	/*
1461	* We can only add to the default POSIX ACE list if the ACE is
1462	* designed to be inherited by both files and directories.
1463	*/
1464
1465	if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1466	(SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1467
1468	DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1469
1470	/*
1471	* Note if this was an allow ace. We can't process
1472	* any further deny ace's after this.
1473	*/
1474
1475	if (current_ace->attr == ALLOW_ACE)
1476	got_dir_allow = True;
1477
1478	if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1479	DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1480	Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1481	free_canon_ace_list(file_ace);
1482	free_canon_ace_list(dir_ace);
1483	return False;
1484	}
1485
1486	if( DEBUGLVL( 10 )) {
1487	dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1488	print_canon_ace( current_ace, 0);
1489	}
1490
1491	/*
1492	* If this is not an inherit only ACE we need to add a duplicate
1493	* to the file acl.
1494	*/
1495
1496	if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1497	canon_ace *dup_ace = dup_canon_ace(current_ace);
1498
1499	if (!dup_ace) {
1500	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1501	free_canon_ace_list(file_ace);
1502	free_canon_ace_list(dir_ace);
1503	return False;
1504	}
1505
1506	/*
1507	* We must not free current_ace here as its
1508	* pointer is now owned by the dir_ace list.
1509	*/
1510	current_ace = dup_ace;
1511	} else {
1512	/*
1513	* We must not free current_ace here as its
1514	* pointer is now owned by the dir_ace list.
1515	*/
1516	current_ace = NULL;
1517	}
1518	}
1519	}
1520
1521	/*
1522	* Only add to the file ACL if not inherit only.
1523	*/
1524
1525	if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1526	DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1527
1528	/*
1529	* Note if this was an allow ace. We can't process
1530	* any further deny ace's after this.
1531	*/
1532
1533	if (current_ace->attr == ALLOW_ACE)
1534	got_file_allow = True;
1535
1536	if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1537	DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1538	Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1539	free_canon_ace_list(file_ace);
1540	free_canon_ace_list(dir_ace);
1541	return False;
1542	}
1543
1544	if( DEBUGLVL( 10 )) {
1545	dbgtext("create_canon_ace_lists: adding file ACL:\n");
1546	print_canon_ace( current_ace, 0);
1547	}
1548	all_aces_are_inherit_only = False;
1549	/*
1550	* We must not free current_ace here as its
1551	* pointer is now owned by the file_ace list.
1552	*/
1553	current_ace = NULL;
1554	}
1555
1556	/*
1557	* Free if ACE was not added.
1558	*/
1559
1560	SAFE_FREE(current_ace);
1561	}
1562
1563	if (fsp->is_directory && all_aces_are_inherit_only) {
1564	/*
1565	* Windows 2000 is doing one of these weird 'inherit acl'
1566	* traverses to conserve NTFS ACL resources. Just pretend
1567	* there was no DACL sent. JRA.
1568	*/
1569
1570	DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1571	free_canon_ace_list(file_ace);
1572	free_canon_ace_list(dir_ace);
1573	file_ace = NULL;
1574	dir_ace = NULL;
1575	} else {
1576	/*
1577	* Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1578	* ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1579	* entries can be converted to *_OBJ. Usually we will already have these
1580	* entries in the Default ACL, and the Access ACL will not have them.
1581	*/
1582	if (file_ace) {
1583	check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1584	}
1585	if (dir_ace) {
1586	check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1587	}
1588	}
1589
1590	*ppfile_ace = file_ace;
1591	*ppdir_ace = dir_ace;
1592
1593	return True;
1594	}
1595
1596	/****************************************************************************
1597	ASCII art time again... JRA :-).
1598
1599	We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1600	we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1601	entries). Secondly, the merge code has ensured that all duplicate SID entries for
1602	allow or deny have been merged, so the same SID can only appear once in the deny
1603	list or once in the allow list.
1604
1605	We then process as follows :
1606
1607	---------------------------------------------------------------------------
1608	First pass - look for a Everyone DENY entry.
1609
1610	If it is deny all (rwx) trunate the list at this point.
1611	Else, walk the list from this point and use the deny permissions of this
1612	entry as a mask on all following allow entries. Finally, delete
1613	the Everyone DENY entry (we have applied it to everything possible).
1614
1615	In addition, in this pass we remove any DENY entries that have
1616	no permissions (ie. they are a DENY nothing).
1617	---------------------------------------------------------------------------
1618	Second pass - only deal with deny user entries.
1619
1620	DENY user1 (perms XXX)
1621
1622	new_perms = 0
1623	for all following allow group entries where user1 is in group
1624	new_perms \|= group_perms;
1625
1626	user1 entry perms = new_perms & ~ XXX;
1627
1628	Convert the deny entry to an allow entry with the new perms and
1629	push to the end of the list. Note if the user was in no groups
1630	this maps to a specific allow nothing entry for this user.
1631
1632	The common case from the NT ACL choser (userX deny all) is
1633	optimised so we don't do the group lookup - we just map to
1634	an allow nothing entry.
1635
1636	What we're doing here is inferring the allow permissions the
1637	person setting the ACE on user1 wanted by looking at the allow
1638	permissions on the groups the user is currently in. This will
1639	be a snapshot, depending on group membership but is the best
1640	we can do and has the advantage of failing closed rather than
1641	open.
1642	---------------------------------------------------------------------------
1643	Third pass - only deal with deny group entries.
1644
1645	DENY group1 (perms XXX)
1646
1647	for all following allow user entries where user is in group1
1648	user entry perms = user entry perms & ~ XXX;
1649
1650	If there is a group Everyone allow entry with permissions YYY,
1651	convert the group1 entry to an allow entry and modify its
1652	permissions to be :
1653
1654	new_perms = YYY & ~ XXX
1655
1656	and push to the end of the list.
1657
1658	If there is no group Everyone allow entry then convert the
1659	group1 entry to a allow nothing entry and push to the end of the list.
1660
1661	Note that the common case from the NT ACL choser (groupX deny all)
1662	cannot be optimised here as we need to modify user entries who are
1663	in the group to change them to a deny all also.
1664
1665	What we're doing here is modifying the allow permissions of
1666	user entries (which are more specific in POSIX ACLs) to mask
1667	out the explicit deny set on the group they are in. This will
1668	be a snapshot depending on current group membership but is the
1669	best we can do and has the advantage of failing closed rather
1670	than open.
1671	---------------------------------------------------------------------------
1672	Fourth pass - cope with cumulative permissions.
1673
1674	for all allow user entries, if there exists an allow group entry with
1675	more permissive permissions, and the user is in that group, rewrite the
1676	allow user permissions to contain both sets of permissions.
1677
1678	Currently the code for this is #ifdef'ed out as these semantics make
1679	no sense to me. JRA.
1680	---------------------------------------------------------------------------
1681
1682	Note we MUST do the deny user pass first as this will convert deny user
1683	entries into allow user entries which can then be processed by the deny
1684	group pass.
1685
1686	The above algorithm took a lot of thinking about - hence this
1687	explaination :-). JRA.
1688	****************************************************************************/
1689
1690	/****************************************************************************
1691	Process a canon_ace list entries. This is very complex code. We need
1692	to go through and remove the "deny" permissions from any allow entry that matches
1693	the id of this entry. We have already refused any NT ACL that wasn't in correct
1694	order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1695	we just remove it (to fail safe). We have already removed any duplicate ace
1696	entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1697	allow entries.
1698	****************************************************************************/
1699
1700	static void process_deny_list( canon_ace **pp_ace_list )
1701	{
1702	canon_ace ace_list = pp_ace_list;
1703	canon_ace *curr_ace = NULL;
1704	canon_ace *curr_ace_next = NULL;
1705
1706	/* Pass 1 above - look for an Everyone, deny entry. */
1707
1708	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1709	canon_ace *allow_ace_p;
1710
1711	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1712
1713	if (curr_ace->attr != DENY_ACE)
1714	continue;
1715
1716	if (curr_ace->perms == (mode_t)0) {
1717
1718	/* Deny nothing entry - delete. */
1719
1720	DLIST_REMOVE(ace_list, curr_ace);
1721	continue;
1722	}
1723
1724	if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1725	continue;
1726
1727	/* JRATEST - assert. */
1728	SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1729
1730	if (curr_ace->perms == ALL_ACE_PERMS) {
1731
1732	/*
1733	* Optimisation. This is a DENY_ALL to Everyone. Truncate the
1734	* list at this point including this entry.
1735	*/
1736
1737	canon_ace *prev_entry = curr_ace->prev;
1738
1739	free_canon_ace_list( curr_ace );
1740	if (prev_entry)
1741	prev_entry->next = NULL;
1742	else {
1743	/* We deleted the entire list. */
1744	ace_list = NULL;
1745	}
1746	break;
1747	}
1748
1749	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1750
1751	/*
1752	* Only mask off allow entries.
1753	*/
1754
1755	if (allow_ace_p->attr != ALLOW_ACE)
1756	continue;
1757
1758	allow_ace_p->perms &= ~curr_ace->perms;
1759	}
1760
1761	/*
1762	* Now it's been applied, remove it.
1763	*/
1764
1765	DLIST_REMOVE(ace_list, curr_ace);
1766	}
1767
1768	/* Pass 2 above - deal with deny user entries. */
1769
1770	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1771	mode_t new_perms = (mode_t)0;
1772	canon_ace *allow_ace_p;
1773
1774	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1775
1776	if (curr_ace->attr != DENY_ACE)
1777	continue;
1778
1779	if (curr_ace->owner_type != UID_ACE)
1780	continue;
1781
1782	if (curr_ace->perms == ALL_ACE_PERMS) {
1783
1784	/*
1785	* Optimisation - this is a deny everything to this user.
1786	* Convert to an allow nothing and push to the end of the list.
1787	*/
1788
1789	curr_ace->attr = ALLOW_ACE;
1790	curr_ace->perms = (mode_t)0;
1791	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1792	continue;
1793	}
1794
1795	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1796
1797	if (allow_ace_p->attr != ALLOW_ACE)
1798	continue;
1799
1800	/* We process GID_ACE and WORLD_ACE entries only. */
1801
1802	if (allow_ace_p->owner_type == UID_ACE)
1803	continue;
1804
1805	if (uid_entry_in_group( curr_ace, allow_ace_p))
1806	new_perms \|= allow_ace_p->perms;
1807	}
1808
1809	/*
1810	* Convert to a allow entry, modify the perms and push to the end
1811	* of the list.
1812	*/
1813
1814	curr_ace->attr = ALLOW_ACE;
1815	curr_ace->perms = (new_perms & ~curr_ace->perms);
1816	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1817	}
1818
1819	/* Pass 3 above - deal with deny group entries. */
1820
1821	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1822	canon_ace *allow_ace_p;
1823	canon_ace *allow_everyone_p = NULL;
1824
1825	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1826
1827	if (curr_ace->attr != DENY_ACE)
1828	continue;
1829
1830	if (curr_ace->owner_type != GID_ACE)
1831	continue;
1832
1833	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1834
1835	if (allow_ace_p->attr != ALLOW_ACE)
1836	continue;
1837
1838	/* Store a pointer to the Everyone allow, if it exists. */
1839	if (allow_ace_p->owner_type == WORLD_ACE)
1840	allow_everyone_p = allow_ace_p;
1841
1842	/* We process UID_ACE entries only. */
1843
1844	if (allow_ace_p->owner_type != UID_ACE)
1845	continue;
1846
1847	/* Mask off the deny group perms. */
1848
1849	if (uid_entry_in_group( allow_ace_p, curr_ace))
1850	allow_ace_p->perms &= ~curr_ace->perms;
1851	}
1852
1853	/*
1854	* Convert the deny to an allow with the correct perms and
1855	* push to the end of the list.
1856	*/
1857
1858	curr_ace->attr = ALLOW_ACE;
1859	if (allow_everyone_p)
1860	curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1861	else
1862	curr_ace->perms = (mode_t)0;
1863	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1864	}
1865
1866	/* Doing this fourth pass allows Windows semantics to be layered
1867	* on top of POSIX semantics. I'm not sure if this is desirable.
1868	* For example, in W2K ACLs there is no way to say, "Group X no
1869	* access, user Y full access" if user Y is a member of group X.
1870	* This seems completely broken semantics to me.... JRA.
1871	*/
1872
1873	#if 0
1874	/* Pass 4 above - deal with allow entries. */
1875
1876	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1877	canon_ace *allow_ace_p;
1878
1879	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1880
1881	if (curr_ace->attr != ALLOW_ACE)
1882	continue;
1883
1884	if (curr_ace->owner_type != UID_ACE)
1885	continue;
1886
1887	for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1888
1889	if (allow_ace_p->attr != ALLOW_ACE)
1890	continue;
1891
1892	/* We process GID_ACE entries only. */
1893
1894	if (allow_ace_p->owner_type != GID_ACE)
1895	continue;
1896
1897	/* OR in the group perms. */
1898
1899	if (uid_entry_in_group( curr_ace, allow_ace_p))
1900	curr_ace->perms \|= allow_ace_p->perms;
1901	}
1902	}
1903	#endif
1904
1905	*pp_ace_list = ace_list;
1906	}
1907
1908	/****************************************************************************
1909	Create a default mode that will be used if a security descriptor entry has
1910	no user/group/world entries.
1911	****************************************************************************/
1912
1913	static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1914	{
1915	int snum = SNUM(fsp->conn);
1916	mode_t and_bits = (mode_t)0;
1917	mode_t or_bits = (mode_t)0;
1918	mode_t mode = interitable_mode
1919	? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1920	NULL )
1921	: S_IRUSR;
1922
1923	if (fsp->is_directory)
1924	mode \|= (S_IWUSR\|S_IXUSR);
1925
1926	/*
1927	* Now AND with the create mode/directory mode bits then OR with the
1928	* force create mode/force directory mode bits.
1929	*/
1930
1931	if (fsp->is_directory) {
1932	and_bits = lp_dir_security_mask(snum);
1933	or_bits = lp_force_dir_security_mode(snum);
1934	} else {
1935	and_bits = lp_security_mask(snum);
1936	or_bits = lp_force_security_mode(snum);
1937	}
1938
1939	return ((mode & and_bits)\|or_bits);
1940	}
1941
1942	/****************************************************************************
1943	Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1944	succeeding.
1945	****************************************************************************/
1946
1947	static BOOL unpack_canon_ace(files_struct *fsp,
1948	SMB_STRUCT_STAT *pst,
1949	DOM_SID *pfile_owner_sid,
1950	DOM_SID *pfile_grp_sid,
1951	canon_ace ppfile_ace, canon_ace ppdir_ace,
1952	uint32 security_info_sent, SEC_DESC *psd)
1953	{
1954	canon_ace *file_ace = NULL;
1955	canon_ace *dir_ace = NULL;
1956
1957	*ppfile_ace = NULL;
1958	*ppdir_ace = NULL;
1959
1960	if(security_info_sent == 0) {
1961	DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1962	return False;
1963	}
1964
1965	/*
1966	* If no DACL then this is a chown only security descriptor.
1967	*/
1968
1969	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| !psd->dacl)
1970	return True;
1971
1972	/*
1973	* Now go through the DACL and create the canon_ace lists.
1974	*/
1975
1976	if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
1977	&file_ace, &dir_ace, psd->dacl))
1978	return False;
1979
1980	if ((file_ace == NULL) && (dir_ace == NULL)) {
1981	/* W2K traverse DACL set - ignore. */
1982	return True;
1983	}
1984
1985	/*
1986	* Go through the canon_ace list and merge entries
1987	* belonging to identical users of identical allow or deny type.
1988	* We can do this as all deny entries come first, followed by
1989	* all allow entries (we have mandated this before accepting this acl).
1990	*/
1991
1992	print_canon_ace_list( "file ace - before merge", file_ace);
1993	merge_aces( &file_ace );
1994
1995	print_canon_ace_list( "dir ace - before merge", dir_ace);
1996	merge_aces( &dir_ace );
1997
1998	/*
1999	* NT ACLs are order dependent. Go through the acl lists and
2000	* process DENY entries by masking the allow entries.
2001	*/
2002
2003	print_canon_ace_list( "file ace - before deny", file_ace);
2004	process_deny_list( &file_ace);
2005
2006	print_canon_ace_list( "dir ace - before deny", dir_ace);
2007	process_deny_list( &dir_ace);
2008
2009	/*
2010	* A well formed POSIX file or default ACL has at least 3 entries, a
2011	* SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2012	* and optionally a mask entry. Ensure this is the case.
2013	*/
2014
2015	print_canon_ace_list( "file ace - before valid", file_ace);
2016
2017	/*
2018	* A default 3 element mode entry for a file should be r-- --- ---.
2019	* A default 3 element mode entry for a directory should be rwx --- ---.
2020	*/
2021
2022	pst->st_mode = create_default_mode(fsp, False);
2023
2024	if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2025	free_canon_ace_list(file_ace);
2026	free_canon_ace_list(dir_ace);
2027	return False;
2028	}
2029
2030	print_canon_ace_list( "dir ace - before valid", dir_ace);
2031
2032	/*
2033	* A default inheritable 3 element mode entry for a directory should be the
2034	* mode Samba will use to create a file within. Ensure user rwx bits are set if
2035	* it's a directory.
2036	*/
2037
2038	pst->st_mode = create_default_mode(fsp, True);
2039
2040	if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2041	free_canon_ace_list(file_ace);
2042	free_canon_ace_list(dir_ace);
2043	return False;
2044	}
2045
2046	print_canon_ace_list( "file ace - return", file_ace);
2047	print_canon_ace_list( "dir ace - return", dir_ace);
2048
2049	*ppfile_ace = file_ace;
2050	*ppdir_ace = dir_ace;
2051	return True;
2052
2053	}
2054
2055	/******************************************************************************
2056	When returning permissions, try and fit NT display
2057	semantics if possible. Note the the canon_entries here must have been malloced.
2058	The list format should be - first entry = owner, followed by group and other user
2059	entries, last entry = other.
2060
2061	Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2062	are not ordered, and match on the most specific entry rather than walking a list,
2063	then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2064
2065	Entry 0: owner : deny all except read and write.
2066	Entry 1: owner : allow read and write.
2067	Entry 2: group : deny all except read.
2068	Entry 3: group : allow read.
2069	Entry 4: Everyone : allow read.
2070
2071	But NT cannot display this in their ACL editor !
2072	********************************************************************************/
2073
2074	static void arrange_posix_perms( char filename, canon_ace *pp_list_head)
2075	{
2076	canon_ace list_head = pp_list_head;
2077	canon_ace *owner_ace = NULL;
2078	canon_ace *other_ace = NULL;
2079	canon_ace *ace = NULL;
2080
2081	for (ace = list_head; ace; ace = ace->next) {
2082	if (ace->type == SMB_ACL_USER_OBJ)
2083	owner_ace = ace;
2084	else if (ace->type == SMB_ACL_OTHER) {
2085	/* Last ace - this is "other" */
2086	other_ace = ace;
2087	}
2088	}
2089
2090	if (!owner_ace \|\| !other_ace) {
2091	DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2092	filename ));
2093	return;
2094	}
2095
2096	/*
2097	* The POSIX algorithm applies to owner first, and other last,
2098	* so ensure they are arranged in this order.
2099	*/
2100
2101	if (owner_ace) {
2102	DLIST_PROMOTE(list_head, owner_ace);
2103	}
2104
2105	if (other_ace) {
2106	DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2107	}
2108
2109	/* We have probably changed the head of the list. */
2110
2111	*pp_list_head = list_head;
2112	}
2113
2114	/****************************************************************************
2115	Create a linked list of canonical ACE entries.
2116	****************************************************************************/
2117
2118	static canon_ace canonicalise_acl( files_struct fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
2119	const DOM_SID powner, const DOM_SID pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2120	{
2121	connection_struct *conn = fsp->conn;
2122	mode_t acl_mask = (S_IRUSR\|S_IWUSR\|S_IXUSR);
2123	canon_ace *list_head = NULL;
2124	canon_ace *ace = NULL;
2125	canon_ace *next_ace = NULL;
2126	int entry_id = SMB_ACL_FIRST_ENTRY;
2127	SMB_ACL_ENTRY_T entry;
2128	size_t ace_count;
2129
2130	while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2131	SMB_ACL_TAG_T tagtype;
2132	SMB_ACL_PERMSET_T permset;
2133	DOM_SID sid;
2134	posix_id unix_ug;
2135	enum ace_owner owner_type;
2136
2137	/* get_next... */
2138	if (entry_id == SMB_ACL_FIRST_ENTRY)
2139	entry_id = SMB_ACL_NEXT_ENTRY;
2140
2141	/* Is this a MASK entry ? */
2142	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2143	continue;
2144
2145	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2146	continue;
2147
2148	/* Decide which SID to use based on the ACL type. */
2149	switch(tagtype) {
2150	case SMB_ACL_USER_OBJ:
2151	/* Get the SID from the owner. */
2152	sid_copy(&sid, powner);
2153	unix_ug.uid = psbuf->st_uid;
2154	owner_type = UID_ACE;
2155	break;
2156	case SMB_ACL_USER:
2157	{
2158	uid_t puid = (uid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2159	if (puid == NULL) {
2160	DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2161	continue;
2162	}
2163	/*
2164	* A SMB_ACL_USER entry for the owner is shadowed by the
2165	* SMB_ACL_USER_OBJ entry and Windows also cannot represent
2166	* that entry, so we ignore it. We also don't create such
2167	* entries out of the blue when setting ACLs, so a get/set
2168	* cycle will drop them.
2169	*/
2170	if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2171	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2172	continue;
2173	}
2174	uid_to_sid( &sid, *puid);
2175	unix_ug.uid = *puid;
2176	owner_type = UID_ACE;
2177	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2178	break;
2179	}
2180	case SMB_ACL_GROUP_OBJ:
2181	/* Get the SID from the owning group. */
2182	sid_copy(&sid, pgroup);
2183	unix_ug.gid = psbuf->st_gid;
2184	owner_type = GID_ACE;
2185	break;
2186	case SMB_ACL_GROUP:
2187	{
2188	gid_t pgid = (gid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2189	if (pgid == NULL) {
2190	DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2191	continue;
2192	}
2193	gid_to_sid( &sid, *pgid);
2194	unix_ug.gid = *pgid;
2195	owner_type = GID_ACE;
2196	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2197	break;
2198	}
2199	case SMB_ACL_MASK:
2200	acl_mask = convert_permset_to_mode_t(conn, permset);
2201	continue; /* Don't count the mask as an entry. */
2202	case SMB_ACL_OTHER:
2203	/* Use the Everyone SID */
2204	sid = global_sid_World;
2205	unix_ug.world = -1;
2206	owner_type = WORLD_ACE;
2207	break;
2208	default:
2209	DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2210	continue;
2211	}
2212
2213	/*
2214	* Add this entry to the list.
2215	*/
2216
2217	if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2218	goto fail;
2219
2220	ZERO_STRUCTP(ace);
2221	ace->type = tagtype;
2222	ace->perms = convert_permset_to_mode_t(conn, permset);
2223	ace->attr = ALLOW_ACE;
2224	ace->trustee = sid;
2225	ace->unix_ug = unix_ug;
2226	ace->owner_type = owner_type;
2227	ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2228
2229	DLIST_ADD(list_head, ace);
2230	}
2231
2232	/*
2233	* This next call will ensure we have at least a user/group/world set.
2234	*/
2235
2236	if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
2237	goto fail;
2238
2239	/*
2240	* Now go through the list, masking the permissions with the
2241	* acl_mask. Ensure all DENY Entries are at the start of the list.
2242	*/
2243
2244	DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2245
2246	for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2247	next_ace = ace->next;
2248
2249	/* Masks are only applied to entries other than USER_OBJ and OTHER. */
2250	if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2251	ace->perms &= acl_mask;
2252
2253	if (ace->perms == 0) {
2254	DLIST_PROMOTE(list_head, ace);
2255	}
2256
2257	if( DEBUGLVL( 10 ) ) {
2258	print_canon_ace(ace, ace_count);
2259	}
2260	}
2261
2262	arrange_posix_perms(fsp->fsp_name,&list_head );
2263
2264	print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2265
2266	return list_head;
2267
2268	fail:
2269
2270	free_canon_ace_list(list_head);
2271	return NULL;
2272	}
2273
2274	/****************************************************************************
2275	Check if the current user group list contains a given group.
2276	****************************************************************************/
2277
2278	static BOOL current_user_in_group(gid_t gid)
2279	{
2280	int i;
2281
2282	for (i = 0; i < current_user.ut.ngroups; i++) {
2283	if (current_user.ut.groups[i] == gid) {
2284	return True;
2285	}
2286	}
2287
2288	return False;
2289	}
2290
2291	/****************************************************************************
2292	Should we override a deny ? Check deprecated 'acl group control'
2293	and 'dos filemode'
2294	****************************************************************************/
2295
2296	static BOOL acl_group_override(connection_struct *conn, gid_t prim_gid)
2297	{
2298	if ( (errno == EACCES \|\| errno == EPERM)
2299	&& (lp_acl_group_control(SNUM(conn)) \|\| lp_dos_filemode(SNUM(conn)))
2300	&& current_user_in_group(prim_gid))
2301	{
2302	return True;
2303	}
2304
2305	return False;
2306	}
2307
2308	/****************************************************************************
2309	Attempt to apply an ACL to a file or directory.
2310	****************************************************************************/
2311
2312	static BOOL set_canon_ace_list(files_struct fsp, canon_ace the_ace, BOOL default_ace, gid_t prim_gid, BOOL *pacl_set_support)
2313	{
2314	connection_struct *conn = fsp->conn;
2315	BOOL ret = False;
2316	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2317	canon_ace *p_ace;
2318	int i;
2319	SMB_ACL_ENTRY_T mask_entry;
2320	BOOL got_mask_entry = False;
2321	SMB_ACL_PERMSET_T mask_permset;
2322	SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2323	BOOL needs_mask = False;
2324	mode_t mask_perms = 0;
2325
2326	#if defined(POSIX_ACL_NEEDS_MASK)
2327	/* HP-UX always wants to have a mask (called "class" there). */
2328	needs_mask = True;
2329	#endif
2330
2331	if (the_acl == NULL) {
2332
2333	if (!no_acl_syscall_error(errno)) {
2334	/*
2335	* Only print this error message if we have some kind of ACL
2336	* support that's not working. Otherwise we would always get this.
2337	*/
2338	DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2339	default_ace ? "default" : "file", strerror(errno) ));
2340	}
2341	*pacl_set_support = False;
2342	return False;
2343	}
2344
2345	if( DEBUGLVL( 10 )) {
2346	dbgtext("set_canon_ace_list: setting ACL:\n");
2347	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2348	print_canon_ace( p_ace, i);
2349	}
2350	}
2351
2352	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2353	SMB_ACL_ENTRY_T the_entry;
2354	SMB_ACL_PERMSET_T the_permset;
2355
2356	/*
2357	* ACLs only "need" an ACL_MASK entry if there are any named user or
2358	* named group entries. But if there is an ACL_MASK entry, it applies
2359	* to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2360	* so that it doesn't deny (i.e., mask off) any permissions.
2361	*/
2362
2363	if (p_ace->type == SMB_ACL_USER \|\| p_ace->type == SMB_ACL_GROUP) {
2364	needs_mask = True;
2365	mask_perms \|= p_ace->perms;
2366	} else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2367	mask_perms \|= p_ace->perms;
2368	}
2369
2370	/*
2371	* Get the entry for this ACE.
2372	*/
2373
2374	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2375	DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2376	i, strerror(errno) ));
2377	goto fail;
2378	}
2379
2380	if (p_ace->type == SMB_ACL_MASK) {
2381	mask_entry = the_entry;
2382	got_mask_entry = True;
2383	}
2384
2385	/*
2386	* Ok - we now know the ACL calls should be working, don't
2387	* allow fallback to chmod.
2388	*/
2389
2390	*pacl_set_support = True;
2391
2392	/*
2393	* Initialise the entry from the canon_ace.
2394	*/
2395
2396	/*
2397	* First tell the entry what type of ACE this is.
2398	*/
2399
2400	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2401	DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2402	i, strerror(errno) ));
2403	goto fail;
2404	}
2405
2406	/*
2407	* Only set the qualifier (user or group id) if the entry is a user
2408	* or group id ACE.
2409	*/
2410
2411	if ((p_ace->type == SMB_ACL_USER) \|\| (p_ace->type == SMB_ACL_GROUP)) {
2412	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2413	DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2414	i, strerror(errno) ));
2415	goto fail;
2416	}
2417	}
2418
2419	/*
2420	* Convert the mode_t perms in the canon_ace to a POSIX permset.
2421	*/
2422
2423	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2424	DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2425	i, strerror(errno) ));
2426	goto fail;
2427	}
2428
2429	if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2430	DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2431	(unsigned int)p_ace->perms, i, strerror(errno) ));
2432	goto fail;
2433	}
2434
2435	/*
2436	* ..and apply them to the entry.
2437	*/
2438
2439	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2440	DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2441	i, strerror(errno) ));
2442	goto fail;
2443	}
2444
2445	if( DEBUGLVL( 10 ))
2446	print_canon_ace( p_ace, i);
2447
2448	}
2449
2450	if (needs_mask && !got_mask_entry) {
2451	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2452	DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2453	goto fail;
2454	}
2455
2456	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2457	DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2458	goto fail;
2459	}
2460
2461	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2462	DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2463	goto fail;
2464	}
2465
2466	if (map_acl_perms_to_permset(conn, S_IRUSR\|S_IWUSR\|S_IXUSR, &mask_permset) == -1) {
2467	DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2468	goto fail;
2469	}
2470
2471	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2472	DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2473	goto fail;
2474	}
2475	}
2476
2477	/*
2478	* Finally apply it to the file or directory.
2479	*/
2480
2481	if(default_ace \|\| fsp->is_directory \|\| fsp->fh->fd == -1) {
2482	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2483	/*
2484	* Some systems allow all the above calls and only fail with no ACL support
2485	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2486	*/
2487	if (no_acl_syscall_error(errno)) {
2488	*pacl_set_support = False;
2489	}
2490
2491	if (acl_group_override(conn, prim_gid)) {
2492	int sret;
2493
2494	DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2495	fsp->fsp_name ));
2496
2497	become_root();
2498	sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2499	unbecome_root();
2500	if (sret == 0) {
2501	ret = True;
2502	}
2503	}
2504
2505	if (ret == False) {
2506	DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2507	the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2508	fsp->fsp_name, strerror(errno) ));
2509	goto fail;
2510	}
2511	}
2512	} else {
2513	if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl) == -1) {
2514	/*
2515	* Some systems allow all the above calls and only fail with no ACL support
2516	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2517	*/
2518	if (no_acl_syscall_error(errno)) {
2519	*pacl_set_support = False;
2520	}
2521
2522	if (acl_group_override(conn, prim_gid)) {
2523	int sret;
2524
2525	DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2526	fsp->fsp_name ));
2527
2528	become_root();
2529	sret = SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl);
2530	unbecome_root();
2531	if (sret == 0) {
2532	ret = True;
2533	}
2534	}
2535
2536	if (ret == False) {
2537	DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2538	fsp->fsp_name, strerror(errno) ));
2539	goto fail;
2540	}
2541	}
2542	}
2543
2544	ret = True;
2545
2546	fail:
2547
2548	if (the_acl != NULL) {
2549	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2550	}
2551
2552	return ret;
2553	}
2554
2555	/****************************************************************************
2556	Find a particular canon_ace entry.
2557	****************************************************************************/
2558
2559	static struct canon_ace canon_ace_entry_for(struct canon_ace list, SMB_ACL_TAG_T type, posix_id *id)
2560	{
2561	while (list) {
2562	if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) \|\|
2563	(type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) \|\|
2564	(type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2565	break;
2566	list = list->next;
2567	}
2568	return list;
2569	}
2570
2571	/****************************************************************************
2572
2573	****************************************************************************/
2574
2575	SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2576	{
2577	SMB_ACL_ENTRY_T entry;
2578
2579	if (!the_acl)
2580	return NULL;
2581	if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2582	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2583	return NULL;
2584	}
2585	return the_acl;
2586	}
2587
2588	/****************************************************************************
2589	Convert a canon_ace to a generic 3 element permission - if possible.
2590	****************************************************************************/
2591
2592	#define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2593
2594	static BOOL convert_canon_ace_to_posix_perms( files_struct fsp, canon_ace file_ace_list, mode_t *posix_perms)
2595	{
2596	int snum = SNUM(fsp->conn);
2597	size_t ace_count = count_canon_ace_list(file_ace_list);
2598	canon_ace *ace_p;
2599	canon_ace *owner_ace = NULL;
2600	canon_ace *group_ace = NULL;
2601	canon_ace *other_ace = NULL;
2602	mode_t and_bits;
2603	mode_t or_bits;
2604
2605	if (ace_count != 3) {
2606	DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2607	posix perms.\n", fsp->fsp_name ));
2608	return False;
2609	}
2610
2611	for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2612	if (ace_p->owner_type == UID_ACE)
2613	owner_ace = ace_p;
2614	else if (ace_p->owner_type == GID_ACE)
2615	group_ace = ace_p;
2616	else if (ace_p->owner_type == WORLD_ACE)
2617	other_ace = ace_p;
2618	}
2619
2620	if (!owner_ace \|\| !group_ace \|\| !other_ace) {
2621	DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2622	fsp->fsp_name ));
2623	return False;
2624	}
2625
2626	*posix_perms = (mode_t)0;
2627
2628	*posix_perms \|= owner_ace->perms;
2629	*posix_perms \|= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2630	*posix_perms \|= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2631	*posix_perms \|= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2632	*posix_perms \|= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2633	*posix_perms \|= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2634	*posix_perms \|= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2635
2636	/* The owner must have at least read access. */
2637
2638	*posix_perms \|= S_IRUSR;
2639	if (fsp->is_directory)
2640	*posix_perms \|= (S_IWUSR\|S_IXUSR);
2641
2642	/* If requested apply the masks. */
2643
2644	/* Get the initial bits to apply. */
2645
2646	if (fsp->is_directory) {
2647	and_bits = lp_dir_security_mask(snum);
2648	or_bits = lp_force_dir_security_mode(snum);
2649	} else {
2650	and_bits = lp_security_mask(snum);
2651	or_bits = lp_force_security_mode(snum);
2652	}
2653
2654	posix_perms = (((posix_perms) & and_bits)\|or_bits);
2655
2656	DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2657	(int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2658	fsp->fsp_name ));
2659
2660	return True;
2661	}
2662
2663	/****************************************************************************
2664	Incoming NT ACLs on a directory can be split into a default POSIX acl (CI\|OI\|IO) and
2665	a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2666	with CI\|OI set so it is inherited and also applies to the directory.
2667	Based on code from "Jim McDonough" <[email protected]>.
2668	****************************************************************************/
2669
2670	static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2671	{
2672	size_t i, j;
2673
2674	for (i = 0; i < num_aces; i++) {
2675	for (j = i+1; j < num_aces; j++) {
2676	uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2677	uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2678	BOOL i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2679	BOOL j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2680
2681	/* We know the lower number ACE's are file entries. */
2682	if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2683	(nt_ace_list[i].size == nt_ace_list[j].size) &&
2684	(nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2685	sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2686	(i_inh == j_inh) &&
2687	(i_flags_ni == 0) &&
2688	(j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT\|
2689	SEC_ACE_FLAG_CONTAINER_INHERIT\|
2690	SEC_ACE_FLAG_INHERIT_ONLY))) {
2691	/*
2692	* W2K wants to have access allowed zero access ACE's
2693	* at the end of the list. If the mask is zero, merge
2694	* the non-inherited ACE onto the inherited ACE.
2695	*/
2696
2697	if (nt_ace_list[i].access_mask == 0) {
2698	nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
2699	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2700	if (num_aces - i - 1 > 0)
2701	memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2702	sizeof(SEC_ACE));
2703
2704	DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2705	(unsigned int)i, (unsigned int)j ));
2706	} else {
2707	/*
2708	* These are identical except for the flags.
2709	* Merge the inherited ACE onto the non-inherited ACE.
2710	*/
2711
2712	nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
2713	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2714	if (num_aces - j - 1 > 0)
2715	memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2716	sizeof(SEC_ACE));
2717
2718	DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2719	(unsigned int)j, (unsigned int)i ));
2720	}
2721	num_aces--;
2722	break;
2723	}
2724	}
2725	}
2726
2727	return num_aces;
2728	}
2729	/****************************************************************************
2730	Reply to query a security descriptor from an fsp. If it succeeds it allocates
2731	the space for the return elements and returns the size needed to return the
2732	security descriptor. This should be the only external function needed for
2733	the UNIX style get ACL.
2734	****************************************************************************/
2735
2736	size_t get_nt_acl(files_struct fsp, uint32 security_info, SEC_DESC *ppdesc)
2737	{
2738	connection_struct *conn = fsp->conn;
2739	SMB_STRUCT_STAT sbuf;
2740	SEC_ACE *nt_ace_list = NULL;
2741	DOM_SID owner_sid;
2742	DOM_SID group_sid;
2743	size_t sd_size = 0;
2744	SEC_ACL *psa = NULL;
2745	size_t num_acls = 0;
2746	size_t num_def_acls = 0;
2747	size_t num_aces = 0;
2748	SMB_ACL_T posix_acl = NULL;
2749	SMB_ACL_T def_acl = NULL;
2750	canon_ace *file_ace = NULL;
2751	canon_ace *dir_ace = NULL;
2752	size_t num_profile_acls = 0;
2753	struct pai_val *pal = NULL;
2754	SEC_DESC *psd = NULL;
2755
2756	*ppdesc = NULL;
2757
2758	DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
2759
2760	if(fsp->is_directory \|\| fsp->fh->fd == -1) {
2761
2762	/* Get the stat struct for the owner info. */
2763	if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
2764	return 0;
2765	}
2766	/*
2767	* Get the ACL from the path.
2768	*/
2769
2770	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
2771
2772	/*
2773	* If it's a directory get the default POSIX ACL.
2774	*/
2775
2776	if(fsp->is_directory) {
2777	def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
2778	def_acl = free_empty_sys_acl(conn, def_acl);
2779	}
2780
2781	} else {
2782
2783	/* Get the stat struct for the owner info. */
2784	if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0) {
2785	return 0;
2786	}
2787	/*
2788	* Get the ACL from the fd.
2789	*/
2790	posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
2791	}
2792
2793	DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
2794	posix_acl ? "present" : "absent",
2795	def_acl ? "present" : "absent" ));
2796
2797	pal = load_inherited_info(fsp);
2798
2799	/*
2800	* Get the owner, group and world SIDs.
2801	*/
2802
2803	if (lp_profile_acls(SNUM(conn))) {
2804	/* For WXP SP1 the owner must be administrators. */
2805	sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2806	sid_copy(&group_sid, &global_sid_Builtin_Users);
2807	num_profile_acls = 2;
2808	} else {
2809	create_file_sids(&sbuf, &owner_sid, &group_sid);
2810	}
2811
2812	if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2813
2814	/*
2815	* In the optimum case Creator Owner and Creator Group would be used for
2816	* the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2817	* would lead to usability problems under Windows: The Creator entries
2818	* are only available in browse lists of directories and not for files;
2819	* additionally the identity of the owning group couldn't be determined.
2820	* We therefore use those identities only for Default ACLs.
2821	*/
2822
2823	/* Create the canon_ace lists. */
2824	file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid, pal, SMB_ACL_TYPE_ACCESS );
2825
2826	/* We must have some ACLS. */
2827
2828	if (count_canon_ace_list(file_ace) == 0) {
2829	DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
2830	goto done;
2831	}
2832
2833	if (fsp->is_directory && def_acl) {
2834	dir_ace = canonicalise_acl(fsp, def_acl, &sbuf,
2835	&global_sid_Creator_Owner,
2836	&global_sid_Creator_Group, pal, SMB_ACL_TYPE_DEFAULT );
2837	}
2838
2839	/*
2840	* Create the NT ACE list from the canonical ace lists.
2841	*/
2842
2843	{
2844	canon_ace *ace;
2845	int nt_acl_type;
2846	int i;
2847
2848	if (nt4_compatible_acls() && dir_ace) {
2849	/*
2850	* NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2851	* but no non-INHERIT_ONLY entry for one SID. So we only
2852	* remove entries from the Access ACL if the
2853	* corresponding Default ACL entries have also been
2854	* removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2855	* are exceptions. We can do nothing
2856	* intelligent if the Default ACL contains entries that
2857	* are not also contained in the Access ACL, so this
2858	* case will still fail under NT 4.
2859	*/
2860
2861	ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2862	if (ace && !ace->perms) {
2863	DLIST_REMOVE(dir_ace, ace);
2864	SAFE_FREE(ace);
2865
2866	ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2867	if (ace && !ace->perms) {
2868	DLIST_REMOVE(file_ace, ace);
2869	SAFE_FREE(ace);
2870	}
2871	}
2872
2873	/*
2874	* WinNT doesn't usually have Creator Group
2875	* in browse lists, so we send this entry to
2876	* WinNT even if it contains no relevant
2877	* permissions. Once we can add
2878	* Creator Group to browse lists we can
2879	* re-enable this.
2880	*/
2881
2882	#if 0
2883	ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2884	if (ace && !ace->perms) {
2885	DLIST_REMOVE(dir_ace, ace);
2886	SAFE_FREE(ace);
2887	}
2888	#endif
2889
2890	ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2891	if (ace && !ace->perms) {
2892	DLIST_REMOVE(file_ace, ace);
2893	SAFE_FREE(ace);
2894	}
2895	}
2896
2897	num_acls = count_canon_ace_list(file_ace);
2898	num_def_acls = count_canon_ace_list(dir_ace);
2899
2900	/* Allocate the ace list. */
2901	if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2902	DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2903	goto done;
2904	}
2905
2906	memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2907
2908	/*
2909	* Create the NT ACE list from the canonical ace lists.
2910	*/
2911
2912	ace = file_ace;
2913
2914	for (i = 0; i < num_acls; i++, ace = ace->next) {
2915	SEC_ACCESS acc;
2916
2917	acc = map_canon_ace_perms(SNUM(conn),
2918	&nt_acl_type,
2919	ace->perms,
2920	fsp->is_directory);
2921	init_sec_ace(&nt_ace_list[num_aces++],
2922	&ace->trustee,
2923	nt_acl_type,
2924	acc,
2925	ace->inherited ?
2926	SEC_ACE_FLAG_INHERITED_ACE : 0);
2927	}
2928
2929	/* The User must have access to a profile share - even
2930	* if we can't map the SID. */
2931	if (lp_profile_acls(SNUM(conn))) {
2932	SEC_ACCESS acc;
2933
2934	init_sec_access(&acc,FILE_GENERIC_ALL);
2935	init_sec_ace(&nt_ace_list[num_aces++],
2936	&global_sid_Builtin_Users,
2937	SEC_ACE_TYPE_ACCESS_ALLOWED,
2938	acc, 0);
2939	}
2940
2941	ace = dir_ace;
2942
2943	for (i = 0; i < num_def_acls; i++, ace = ace->next) {
2944	SEC_ACCESS acc;
2945
2946	acc = map_canon_ace_perms(SNUM(conn),
2947	&nt_acl_type,
2948	ace->perms,
2949	fsp->is_directory);
2950	init_sec_ace(&nt_ace_list[num_aces++],
2951	&ace->trustee,
2952	nt_acl_type,
2953	acc,
2954	SEC_ACE_FLAG_OBJECT_INHERIT\|
2955	SEC_ACE_FLAG_CONTAINER_INHERIT\|
2956	SEC_ACE_FLAG_INHERIT_ONLY\|
2957	(ace->inherited ?
2958	SEC_ACE_FLAG_INHERITED_ACE : 0));
2959	}
2960
2961	/* The User must have access to a profile share - even
2962	* if we can't map the SID. */
2963	if (lp_profile_acls(SNUM(conn))) {
2964	SEC_ACCESS acc;
2965
2966	init_sec_access(&acc,FILE_GENERIC_ALL);
2967	init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
2968	SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
2969	SEC_ACE_FLAG_INHERIT_ONLY\|0);
2970	}
2971
2972	/*
2973	* Merge POSIX default ACLs and normal ACLs into one NT ACE.
2974	* Win2K needs this to get the inheritance correct when replacing ACLs
2975	* on a directory tree. Based on work by Jim @ IBM.
2976	*/
2977
2978	num_aces = merge_default_aces(nt_ace_list, num_aces);
2979
2980	}
2981
2982	if (num_aces) {
2983	if((psa = make_sec_acl( main_loop_talloc_get(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
2984	DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
2985	goto done;
2986	}
2987	}
2988	} /* security_info & DACL_SECURITY_INFORMATION */
2989
2990	psd = make_standard_sec_desc( main_loop_talloc_get(),
2991	(security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
2992	(security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
2993	psa,
2994	&sd_size);
2995
2996	if(!psd) {
2997	DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
2998	sd_size = 0;
2999	goto done;
3000	}
3001
3002	/*
3003	* Windows 2000: The DACL_PROTECTED flag in the security
3004	* descriptor marks the ACL as non-inheriting, i.e., no
3005	* ACEs from higher level directories propagate to this
3006	* ACL. In the POSIX ACL model permissions are only
3007	* inherited at file create time, so ACLs never contain
3008	* any ACEs that are inherited dynamically. The DACL_PROTECTED
3009	* flag doesn't seem to bother Windows NT.
3010	* Always set this if map acl inherit is turned off.
3011	*/
3012	if (get_protected_flag(pal) \|\| !lp_map_acl_inherit(SNUM(conn))) {
3013	psd->type \|= SE_DESC_DACL_PROTECTED;
3014	}
3015
3016	if (psd->dacl) {
3017	dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3018	}
3019
3020	*ppdesc = psd;
3021
3022	done:
3023
3024	if (posix_acl) {
3025	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3026	}
3027	if (def_acl) {
3028	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3029	}
3030	free_canon_ace_list(file_ace);
3031	free_canon_ace_list(dir_ace);
3032	free_inherited_info(pal);
3033	SAFE_FREE(nt_ace_list);
3034
3035	return sd_size;
3036	}
3037
3038	/****************************************************************************
3039	Try to chown a file. We will be able to chown it under the following conditions.
3040
3041	1) If we have root privileges, then it will just work.
3042	2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3043	3) If we have SeRestorePrivilege we can change the user to any other user.
3044	4) If we have write permission to the file and dos_filemodes is set
3045	then allow chown to the currently authenticated user.
3046	****************************************************************************/
3047
3048	int try_chown(connection_struct conn, const char fname, uid_t uid, gid_t gid)
3049	{
3050	int ret;
3051	files_struct *fsp;
3052	SMB_STRUCT_STAT st;
3053
3054	if(!CAN_WRITE(conn)) {
3055	return -1;
3056	}
3057
3058	/* Case (1). */
3059	/* try the direct way first */
3060	ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3061	if (ret == 0)
3062	return 0;
3063
3064	/* Case (2) / (3) */
3065	if (lp_enable_privileges()) {
3066
3067	BOOL has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3068	&se_take_ownership);
3069	BOOL has_restore_priv = user_has_privileges(current_user.nt_user_token,
3070	&se_restore);
3071
3072	/* Case (2) */
3073	if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) \|\|
3074	/* Case (3) */
3075	( has_restore_priv ) ) {
3076
3077	become_root();
3078	/* Keep the current file gid the same - take ownership doesn't imply group change. */
3079	ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3080	unbecome_root();
3081	return ret;
3082	}
3083	}
3084
3085	/* Case (4). */
3086	if (!lp_dos_filemode(SNUM(conn))) {
3087	return -1;
3088	}
3089
3090	if (SMB_VFS_STAT(conn,fname,&st)) {
3091	return -1;
3092	}
3093
3094	if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3095	return -1;
3096	}
3097
3098	/* only allow chown to the current user. This is more secure,
3099	and also copes with the case where the SID in a take ownership ACL is
3100	a local SID on the users workstation
3101	*/
3102	uid = current_user.ut.uid;
3103
3104	become_root();
3105	/* Keep the current file gid the same. */
3106	ret = SMB_VFS_FCHOWN(fsp, fsp->fh->fd, uid, (gid_t)-1);
3107	unbecome_root();
3108
3109	close_file_fchmod(fsp);
3110
3111	return ret;
3112	}
3113
3114	/****************************************************************************
3115	Take care of parent ACL inheritance.
3116	****************************************************************************/
3117
3118	static NTSTATUS append_parent_acl(files_struct *fsp,
3119	SMB_STRUCT_STAT *psbuf,
3120	SEC_DESC *psd,
3121	SEC_DESC **pp_new_sd)
3122	{
3123	SEC_DESC *parent_sd = NULL;
3124	files_struct *parent_fsp = NULL;
3125	TALLOC_CTX *mem_ctx = talloc_parent(psd);
3126	char *parent_name = NULL;
3127	SEC_ACE *new_ace = NULL;
3128	unsigned int num_aces = psd->dacl->num_aces;
3129	SMB_STRUCT_STAT sbuf;
3130	NTSTATUS status;
3131	int info;
3132	size_t sd_size;
3133	unsigned int i, j;
3134	BOOL is_dacl_protected = (psd->type & SE_DESC_DACL_PROTECTED);
3135
3136	ZERO_STRUCT(sbuf);
3137
3138	if (mem_ctx == NULL) {
3139	return NT_STATUS_NO_MEMORY;
3140	}
3141
3142	if (!parent_dirname_talloc(mem_ctx,
3143	fsp->fsp_name,
3144	&parent_name,
3145	NULL)) {
3146	return NT_STATUS_NO_MEMORY;
3147	}
3148
3149	status = open_directory(fsp->conn,
3150	parent_name,
3151	&sbuf,
3152	FILE_READ_ATTRIBUTES, /* Just a stat open */
3153	FILE_SHARE_NONE, /* Ignored for stat opens */
3154	FILE_OPEN,
3155	0,
3156	0,
3157	&info,
3158	&parent_fsp);
3159
3160	if (!NT_STATUS_IS_OK(status)) {
3161	return status;
3162	}
3163
3164	sd_size = SMB_VFS_GET_NT_ACL(parent_fsp, parent_fsp->fsp_name,
3165	DACL_SECURITY_INFORMATION, &parent_sd );
3166
3167	close_file(parent_fsp, NORMAL_CLOSE);
3168
3169	if (!sd_size) {
3170	return NT_STATUS_ACCESS_DENIED;
3171	}
3172
3173	/*
3174	* Make room for potentially all the ACLs from
3175	* the parent. We used to add the ugw triple here,
3176	* as we knew we were dealing with POSIX ACLs.
3177	* We no longer need to do so as we can guarentee
3178	* that a default ACL from the parent directory will
3179	* be well formed for POSIX ACLs if it came from a
3180	* POSIX ACL source, and if we're not writing to a
3181	* POSIX ACL sink then we don't care if it's not well
3182	* formed. JRA.
3183	*/
3184
3185	num_aces += parent_sd->dacl->num_aces;
3186
3187	if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3188	num_aces)) == NULL) {
3189	return NT_STATUS_NO_MEMORY;
3190	}
3191
3192	/* Start by copying in all the given ACE entries. */
3193	for (i = 0; i < psd->dacl->num_aces; i++) {
3194	sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3195	}
3196
3197	/*
3198	* Note that we're ignoring "inherit permissions" here
3199	* as that really only applies to newly created files. JRA.
3200	*/
3201
3202	/* Finally append any inherited ACEs. */
3203	for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3204	SEC_ACE *se = &parent_sd->dacl->aces[j];
3205
3206	if (fsp->is_directory) {
3207	if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3208	/* Doesn't apply to a directory - ignore. */
3209	DEBUG(10,("append_parent_acl: directory %s "
3210	"ignoring non container "
3211	"inherit flags %u on ACE with sid %s "
3212	"from parent %s\n",
3213	fsp->fsp_name,
3214	(unsigned int)se->flags,
3215	sid_string_static(&se->trustee),
3216	parent_name));
3217	continue;
3218	}
3219	} else {
3220	if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3221	/* Doesn't apply to a file - ignore. */
3222	DEBUG(10,("append_parent_acl: file %s "
3223	"ignoring non object "
3224	"inherit flags %u on ACE with sid %s "
3225	"from parent %s\n",
3226	fsp->fsp_name,
3227	(unsigned int)se->flags,
3228	sid_string_static(&se->trustee),
3229	parent_name));
3230	continue;
3231	}
3232	}
3233
3234	if (is_dacl_protected) {
3235	/* If the DACL is protected it means we must
3236	* not overwrite an existing ACE entry with the
3237	* same SID. This is order N^2. Ouch :-(. JRA. */
3238	unsigned int k;
3239	for (k = 0; k < psd->dacl->num_aces; k++) {
3240	if (sid_equal(&psd->dacl->aces[k].trustee,
3241	&se->trustee)) {
3242	break;
3243	}
3244	}
3245	if (k < psd->dacl->num_aces) {
3246	/* SID matched. Ignore. */
3247	DEBUG(10,("append_parent_acl: path %s "
3248	"ignoring ACE with protected sid %s "
3249	"from parent %s\n",
3250	fsp->fsp_name,
3251	sid_string_static(&se->trustee),
3252	parent_name));
3253	continue;
3254	}
3255	}
3256
3257	sec_ace_copy(&new_ace[i], se);
3258	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3259	new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3260	}
3261	new_ace[i].flags \|= SEC_ACE_FLAG_INHERITED_ACE;
3262
3263	if (fsp->is_directory) {
3264	/*
3265	* Strip off any inherit only. It's applied.
3266	*/
3267	new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3268	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3269	/* No further inheritance. */
3270	new_ace[i].flags &=
3271	~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3272	SEC_ACE_FLAG_OBJECT_INHERIT);
3273	}
3274	} else {
3275	/*
3276	* Strip off any container or inherit
3277	* flags, they can't apply to objects.
3278	*/
3279	new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3280	SEC_ACE_FLAG_INHERIT_ONLY\|
3281	SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3282	}
3283
3284	i++;
3285
3286	DEBUG(10,("append_parent_acl: path %s "
3287	"inheriting ACE with sid %s "
3288	"from parent %s\n",
3289	fsp->fsp_name,
3290	sid_string_static(&se->trustee),
3291	parent_name));
3292
3293	}
3294
3295	parent_sd->dacl->aces = new_ace;
3296	parent_sd->dacl->num_aces = i;
3297
3298	*pp_new_sd = parent_sd;
3299	return status;
3300	}
3301
3302	/****************************************************************************
3303	Reply to set a security descriptor on an fsp. security_info_sent is the
3304	description of the following NT ACL.
3305	This should be the only external function needed for the UNIX style set ACL.
3306	****************************************************************************/
3307
3308	BOOL set_nt_acl(files_struct fsp, uint32 security_info_sent, SEC_DESC psd)
3309	{
3310	connection_struct *conn = fsp->conn;
3311	uid_t user = (uid_t)-1;
3312	gid_t grp = (gid_t)-1;
3313	SMB_STRUCT_STAT sbuf;
3314	DOM_SID file_owner_sid;
3315	DOM_SID file_grp_sid;
3316	canon_ace *file_ace_list = NULL;
3317	canon_ace *dir_ace_list = NULL;
3318	BOOL acl_perms = False;
3319	mode_t orig_mode = (mode_t)0;
3320	uid_t orig_uid;
3321	gid_t orig_gid;
3322	BOOL need_chown = False;
3323
3324	DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3325
3326	if (!CAN_WRITE(conn)) {
3327	DEBUG(10,("set acl rejected on read-only share\n"));
3328	return False;
3329	}
3330
3331	/*
3332	* Get the current state of the file.
3333	*/
3334
3335	if(fsp->is_directory \|\| fsp->fh->fd == -1) {
3336	if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3337	return False;
3338	} else {
3339	if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0)
3340	return False;
3341	}
3342
3343	/* Save the original elements we check against. */
3344	orig_mode = sbuf.st_mode;
3345	orig_uid = sbuf.st_uid;
3346	orig_gid = sbuf.st_gid;
3347
3348	/*
3349	* Unpack the user/group/world id's.
3350	*/
3351
3352	if (!unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd)) {
3353	return False;
3354	}
3355
3356	/*
3357	* Do we need to chown ?
3358	*/
3359
3360	if (((user != (uid_t)-1) && (orig_uid != user)) \|\| (( grp != (gid_t)-1) && (orig_gid != grp))) {
3361	need_chown = True;
3362	}
3363
3364	/*
3365	* Chown before setting ACL only if we don't change the user, or
3366	* if we change to the current user, but not if we want to give away
3367	* the file.
3368	*/
3369
3370	if (need_chown && (user == (uid_t)-1 \|\| user == current_user.ut.uid)) {
3371
3372	DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3373	fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3374
3375	if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3376	DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3377	fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3378	return False;
3379	}
3380
3381	/*
3382	* Recheck the current state of the file, which may have changed.
3383	* (suid/sgid bits, for instance)
3384	*/
3385
3386	if(fsp->is_directory) {
3387	if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3388	return False;
3389	}
3390	} else {
3391
3392	int ret;
3393
3394	if(fsp->fh->fd == -1)
3395	ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3396	else
3397	ret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf);
3398
3399	if(ret != 0)
3400	return False;
3401	}
3402
3403	/* Save the original elements we check against. */
3404	orig_mode = sbuf.st_mode;
3405	orig_uid = sbuf.st_uid;
3406	orig_gid = sbuf.st_gid;
3407
3408	/* We did it, don't try again */
3409	need_chown = False;
3410	}
3411
3412	create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3413
3414	if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
3415	psd->dacl != NULL &&
3416	(psd->type & (SE_DESC_DACL_AUTO_INHERITED\|
3417	SE_DESC_DACL_AUTO_INHERIT_REQ))==
3418	(SE_DESC_DACL_AUTO_INHERITED\|
3419	SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
3420	NTSTATUS status = append_parent_acl(fsp, &sbuf, psd, &psd);
3421	if (!NT_STATUS_IS_OK(status)) {
3422	return False;
3423	}
3424	}
3425
3426	acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3427	&file_ace_list, &dir_ace_list, security_info_sent, psd);
3428
3429	/* Ignore W2K traverse DACL set. */
3430	if (file_ace_list \|\| dir_ace_list) {
3431
3432	if (!acl_perms) {
3433	DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3434	free_canon_ace_list(file_ace_list);
3435	free_canon_ace_list(dir_ace_list);
3436	return False;
3437	}
3438
3439	/*
3440	* Only change security if we got a DACL.
3441	*/
3442
3443	if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3444
3445	BOOL acl_set_support = False;
3446	BOOL ret = False;
3447
3448	/*
3449	* Try using the POSIX ACL set first. Fall back to chmod if
3450	* we have no ACL support on this filesystem.
3451	*/
3452
3453	if (acl_perms && file_ace_list) {
3454	ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3455	if (acl_set_support && ret == False) {
3456	DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3457	free_canon_ace_list(file_ace_list);
3458	free_canon_ace_list(dir_ace_list);
3459	return False;
3460	}
3461	}
3462
3463	if (acl_perms && acl_set_support && fsp->is_directory) {
3464	if (dir_ace_list) {
3465	if (!set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support)) {
3466	DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3467	free_canon_ace_list(file_ace_list);
3468	free_canon_ace_list(dir_ace_list);
3469	return False;
3470	}
3471	} else {
3472
3473	/*
3474	* No default ACL - delete one if it exists.
3475	*/
3476
3477	if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3478	int sret = -1;
3479
3480	if (acl_group_override(conn, sbuf.st_gid)) {
3481	DEBUG(5,("set_nt_acl: acl group control on and "
3482	"current user in file %s primary group. Override delete_def_acl\n",
3483	fsp->fsp_name ));
3484
3485	become_root();
3486	sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3487	unbecome_root();
3488	}
3489
3490	if (sret == -1) {
3491	DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3492	free_canon_ace_list(file_ace_list);
3493	free_canon_ace_list(dir_ace_list);
3494	return False;
3495	}
3496	}
3497	}
3498	}
3499
3500	if (acl_set_support) {
3501	store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3502	(psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3503	}
3504
3505	/*
3506	* If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3507	*/
3508
3509	if(!acl_set_support && acl_perms) {
3510	mode_t posix_perms;
3511
3512	if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3513	free_canon_ace_list(file_ace_list);
3514	free_canon_ace_list(dir_ace_list);
3515	DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3516	fsp->fsp_name ));
3517	return False;
3518	}
3519
3520	if (orig_mode != posix_perms) {
3521
3522	DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3523	fsp->fsp_name, (unsigned int)posix_perms ));
3524
3525	if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3526	int sret = -1;
3527	if (acl_group_override(conn, sbuf.st_gid)) {
3528	DEBUG(5,("set_nt_acl: acl group control on and "
3529	"current user in file %s primary group. Override chmod\n",
3530	fsp->fsp_name ));
3531
3532	become_root();
3533	sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3534	unbecome_root();
3535	}
3536
3537	if (sret == -1) {
3538	DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3539	fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3540	free_canon_ace_list(file_ace_list);
3541	free_canon_ace_list(dir_ace_list);
3542	return False;
3543	}
3544	}
3545	}
3546	}
3547	}
3548
3549	free_canon_ace_list(file_ace_list);
3550	free_canon_ace_list(dir_ace_list);
3551	}
3552
3553	/* Any chown pending? */
3554	if (need_chown) {
3555
3556	DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3557	fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3558
3559	if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3560	DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3561	fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3562	return False;
3563	}
3564	}
3565
3566	return True;
3567	}
3568
3569	/****************************************************************************
3570	Get the actual group bits stored on a file with an ACL. Has no effect if
3571	the file has no ACL. Needed in dosmode code where the stat() will return
3572	the mask bits, not the real group bits, for a file with an ACL.
3573	****************************************************************************/
3574
3575	int get_acl_group_bits( connection_struct conn, const char fname, mode_t *mode )
3576	{
3577	int entry_id = SMB_ACL_FIRST_ENTRY;
3578	SMB_ACL_ENTRY_T entry;
3579	SMB_ACL_T posix_acl;
3580	int result = -1;
3581
3582	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3583	if (posix_acl == (SMB_ACL_T)NULL)
3584	return -1;
3585
3586	while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3587	SMB_ACL_TAG_T tagtype;
3588	SMB_ACL_PERMSET_T permset;
3589
3590	/* get_next... */
3591	if (entry_id == SMB_ACL_FIRST_ENTRY)
3592	entry_id = SMB_ACL_NEXT_ENTRY;
3593
3594	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3595	break;
3596
3597	if (tagtype == SMB_ACL_GROUP_OBJ) {
3598	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3599	break;
3600	} else {
3601	*mode &= ~(S_IRGRP\|S_IWGRP\|S_IXGRP);
3602	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3603	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3604	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3605	result = 0;
3606	break;
3607	}
3608	}
3609	}
3610	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3611	return result;
3612	}
3613
3614	/****************************************************************************
3615	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3616	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3617	****************************************************************************/
3618
3619	static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3620	{
3621	int entry_id = SMB_ACL_FIRST_ENTRY;
3622	SMB_ACL_ENTRY_T entry;
3623	int num_entries = 0;
3624
3625	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3626	SMB_ACL_TAG_T tagtype;
3627	SMB_ACL_PERMSET_T permset;
3628	mode_t perms;
3629
3630	/* get_next... */
3631	if (entry_id == SMB_ACL_FIRST_ENTRY)
3632	entry_id = SMB_ACL_NEXT_ENTRY;
3633
3634	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3635	return -1;
3636
3637	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3638	return -1;
3639
3640	num_entries++;
3641
3642	switch(tagtype) {
3643	case SMB_ACL_USER_OBJ:
3644	perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3645	break;
3646	case SMB_ACL_GROUP_OBJ:
3647	perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3648	break;
3649	case SMB_ACL_MASK:
3650	/*
3651	* FIXME: The ACL_MASK entry permissions should really be set to
3652	* the union of the permissions of all ACL_USER,
3653	* ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3654	* acl_calc_mask() does, but Samba ACLs doesn't provide it.
3655	*/
3656	perms = S_IRUSR\|S_IWUSR\|S_IXUSR;
3657	break;
3658	case SMB_ACL_OTHER:
3659	perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3660	break;
3661	default:
3662	continue;
3663	}
3664
3665	if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3666	return -1;
3667
3668	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3669	return -1;
3670	}
3671
3672	/*
3673	* If this is a simple 3 element ACL or no elements then it's a standard
3674	* UNIX permission set. Just use chmod...
3675	*/
3676
3677	if ((num_entries == 3) \|\| (num_entries == 0))
3678	return -1;
3679
3680	return 0;
3681	}
3682
3683	/****************************************************************************
3684	Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3685	GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3686	resulting ACL on TO. Note that name is in UNIX character set.
3687	****************************************************************************/
3688
3689	static int copy_access_acl(connection_struct conn, const char from, const char *to, mode_t mode)
3690	{
3691	SMB_ACL_T posix_acl = NULL;
3692	int ret = -1;
3693
3694	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3695	return -1;
3696
3697	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3698	goto done;
3699
3700	ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3701
3702	done:
3703
3704	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3705	return ret;
3706	}
3707
3708	/****************************************************************************
3709	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3710	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3711	Note that name is in UNIX character set.
3712	****************************************************************************/
3713
3714	int chmod_acl(connection_struct conn, const char name, mode_t mode)
3715	{
3716	return copy_access_acl(conn, name, name, mode);
3717	}
3718
3719	/****************************************************************************
3720	If the parent directory has no default ACL but it does have an Access ACL,
3721	inherit this Access ACL to file name.
3722	****************************************************************************/
3723
3724	int inherit_access_acl(connection_struct conn, const char inherit_from_dir,
3725	const char *name, mode_t mode)
3726	{
3727	if (directory_has_default_acl(conn, inherit_from_dir))
3728	return 0;
3729
3730	return copy_access_acl(conn, inherit_from_dir, name, mode);
3731	}
3732
3733	/****************************************************************************
3734	Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3735	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3736	****************************************************************************/
3737
3738	int fchmod_acl(files_struct *fsp, int fd, mode_t mode)
3739	{
3740	connection_struct *conn = fsp->conn;
3741	SMB_ACL_T posix_acl = NULL;
3742	int ret = -1;
3743
3744	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fd)) == NULL)
3745	return -1;
3746
3747	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3748	goto done;
3749
3750	ret = SMB_VFS_SYS_ACL_SET_FD(fsp, fd, posix_acl);
3751
3752	done:
3753
3754	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3755	return ret;
3756	}
3757
3758	/****************************************************************************
3759	Check for an existing default POSIX ACL on a directory.
3760	****************************************************************************/
3761
3762	BOOL directory_has_default_acl(connection_struct conn, const char fname)
3763	{
3764	SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3765	BOOL has_acl = False;
3766	SMB_ACL_ENTRY_T entry;
3767
3768	if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3769	has_acl = True;
3770	}
3771
3772	if (def_acl) {
3773	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3774	}
3775	return has_acl;
3776	}
3777
3778	/****************************************************************************
3779	Map from wire type to permset.
3780	****************************************************************************/
3781
3782	static BOOL unix_ex_wire_to_permset(connection_struct conn, unsigned char wire_perm, SMB_ACL_PERMSET_T p_permset)
3783	{
3784	if (wire_perm & ~(SMB_POSIX_ACL_READ\|SMB_POSIX_ACL_WRITE\|SMB_POSIX_ACL_EXECUTE)) {
3785	return False;
3786	}
3787
3788	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3789	return False;
3790	}
3791
3792	if (wire_perm & SMB_POSIX_ACL_READ) {
3793	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3794	return False;
3795	}
3796	}
3797	if (wire_perm & SMB_POSIX_ACL_WRITE) {
3798	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3799	return False;
3800	}
3801	}
3802	if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3803	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3804	return False;
3805	}
3806	}
3807	return True;
3808	}
3809
3810	/****************************************************************************
3811	Map from wire type to tagtype.
3812	****************************************************************************/
3813
3814	static BOOL unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3815	{
3816	switch (wire_tt) {
3817	case SMB_POSIX_ACL_USER_OBJ:
3818	*p_tt = SMB_ACL_USER_OBJ;
3819	break;
3820	case SMB_POSIX_ACL_USER:
3821	*p_tt = SMB_ACL_USER;
3822	break;
3823	case SMB_POSIX_ACL_GROUP_OBJ:
3824	*p_tt = SMB_ACL_GROUP_OBJ;
3825	break;
3826	case SMB_POSIX_ACL_GROUP:
3827	*p_tt = SMB_ACL_GROUP;
3828	break;
3829	case SMB_POSIX_ACL_MASK:
3830	*p_tt = SMB_ACL_MASK;
3831	break;
3832	case SMB_POSIX_ACL_OTHER:
3833	*p_tt = SMB_ACL_OTHER;
3834	break;
3835	default:
3836	return False;
3837	}
3838	return True;
3839	}
3840
3841	/****************************************************************************
3842	Create a new POSIX acl from wire permissions.
3843	FIXME ! How does the share mask/mode fit into this.... ?
3844	****************************************************************************/
3845
3846	static SMB_ACL_T create_posix_acl_from_wire(connection_struct conn, uint16 num_acls, const char pdata)
3847	{
3848	unsigned int i;
3849	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3850
3851	if (the_acl == NULL) {
3852	return NULL;
3853	}
3854
3855	for (i = 0; i < num_acls; i++) {
3856	SMB_ACL_ENTRY_T the_entry;
3857	SMB_ACL_PERMSET_T the_permset;
3858	SMB_ACL_TAG_T tag_type;
3859
3860	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3861	DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3862	i, strerror(errno) ));
3863	goto fail;
3864	}
3865
3866	if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3867	DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3868	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3869	goto fail;
3870	}
3871
3872	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3873	DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3874	i, strerror(errno) ));
3875	goto fail;
3876	}
3877
3878	/* Get the permset pointer from the new ACL entry. */
3879	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3880	DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3881	i, strerror(errno) ));
3882	goto fail;
3883	}
3884
3885	/* Map from wire to permissions. */
3886	if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3887	DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3888	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3889	goto fail;
3890	}
3891
3892	/* Now apply to the new ACL entry. */
3893	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
3894	DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
3895	i, strerror(errno) ));
3896	goto fail;
3897	}
3898
3899	if (tag_type == SMB_ACL_USER) {
3900	uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3901	uid_t uid = (uid_t)uidval;
3902	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
3903	DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
3904	(unsigned int)uid, i, strerror(errno) ));
3905	goto fail;
3906	}
3907	}
3908
3909	if (tag_type == SMB_ACL_GROUP) {
3910	uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3911	gid_t gid = (uid_t)gidval;
3912	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
3913	DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
3914	(unsigned int)gid, i, strerror(errno) ));
3915	goto fail;
3916	}
3917	}
3918	}
3919
3920	return the_acl;
3921
3922	fail:
3923
3924	if (the_acl != NULL) {
3925	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3926	}
3927	return NULL;
3928	}
3929
3930	/****************************************************************************
3931	Calls from UNIX extensions - Default POSIX ACL set.
3932	If num_def_acls == 0 and not a directory just return. If it is a directory
3933	and num_def_acls == 0 then remove the default acl. Else set the default acl
3934	on the directory.
3935	****************************************************************************/
3936
3937	BOOL set_unix_posix_default_acl(connection_struct conn, const char fname, SMB_STRUCT_STAT *psbuf,
3938	uint16 num_def_acls, const char *pdata)
3939	{
3940	SMB_ACL_T def_acl = NULL;
3941
3942	if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
3943	DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
3944	errno = EISDIR;
3945	return False;
3946	}
3947
3948	if (!num_def_acls) {
3949	/* Remove the default ACL. */
3950	if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
3951	DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
3952	fname, strerror(errno) ));
3953	return False;
3954	}
3955	return True;
3956	}
3957
3958	if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
3959	return False;
3960	}
3961
3962	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
3963	DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
3964	fname, strerror(errno) ));
3965	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3966	return False;
3967	}
3968
3969	DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
3970	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3971	return True;
3972	}
3973
3974	/****************************************************************************
3975	Remove an ACL from a file. As we don't have acl_delete_entry() available
3976	we must read the current acl and copy all entries except MASK, USER and GROUP
3977	to a new acl, then set that. This (at least on Linux) causes any ACL to be
3978	removed.
3979	FIXME ! How does the share mask/mode fit into this.... ?
3980	****************************************************************************/
3981
3982	static BOOL remove_posix_acl(connection_struct conn, files_struct fsp, const char *fname)
3983	{
3984	SMB_ACL_T file_acl = NULL;
3985	int entry_id = SMB_ACL_FIRST_ENTRY;
3986	SMB_ACL_ENTRY_T entry;
3987	BOOL ret = False;
3988	/* Create a new ACL with only 3 entries, u/g/w. */
3989	SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
3990	SMB_ACL_ENTRY_T user_ent = NULL;
3991	SMB_ACL_ENTRY_T group_ent = NULL;
3992	SMB_ACL_ENTRY_T other_ent = NULL;
3993
3994	if (new_file_acl == NULL) {
3995	DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
3996	return False;
3997	}
3998
3999	/* Now create the u/g/w entries. */
4000	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4001	DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4002	fname, strerror(errno) ));
4003	goto done;
4004	}
4005	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4006	DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4007	fname, strerror(errno) ));
4008	goto done;
4009	}
4010
4011	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4012	DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4013	fname, strerror(errno) ));
4014	goto done;
4015	}
4016	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4017	DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4018	fname, strerror(errno) ));
4019	goto done;
4020	}
4021
4022	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4023	DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4024	fname, strerror(errno) ));
4025	goto done;
4026	}
4027	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4028	DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4029	fname, strerror(errno) ));
4030	goto done;
4031	}
4032
4033	/* Get the current file ACL. */
4034	if (fsp && fsp->fh->fd != -1) {
4035	file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
4036	} else {
4037	file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4038	}
4039
4040	if (file_acl == NULL) {
4041	/* This is only returned if an error occurred. Even for a file with
4042	no acl a u/g/w acl should be returned. */
4043	DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4044	fname, strerror(errno) ));
4045	goto done;
4046	}
4047
4048	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4049	SMB_ACL_TAG_T tagtype;
4050	SMB_ACL_PERMSET_T permset;
4051
4052	/* get_next... */
4053	if (entry_id == SMB_ACL_FIRST_ENTRY)
4054	entry_id = SMB_ACL_NEXT_ENTRY;
4055
4056	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4057	DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4058	fname, strerror(errno) ));
4059	goto done;
4060	}
4061
4062	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4063	DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4064	fname, strerror(errno) ));
4065	goto done;
4066	}
4067
4068	if (tagtype == SMB_ACL_USER_OBJ) {
4069	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4070	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4071	fname, strerror(errno) ));
4072	}
4073	} else if (tagtype == SMB_ACL_GROUP_OBJ) {
4074	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4075	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4076	fname, strerror(errno) ));
4077	}
4078	} else if (tagtype == SMB_ACL_OTHER) {
4079	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4080	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4081	fname, strerror(errno) ));
4082	}
4083	}
4084	}
4085
4086	/* Set the new empty file ACL. */
4087	if (fsp && fsp->fh->fd != -1) {
4088	if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, new_file_acl) == -1) {
4089	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4090	fname, strerror(errno) ));
4091	goto done;
4092	}
4093	} else {
4094	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4095	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4096	fname, strerror(errno) ));
4097	goto done;
4098	}
4099	}
4100
4101	ret = True;
4102
4103	done:
4104
4105	if (file_acl) {
4106	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4107	}
4108	if (new_file_acl) {
4109	SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4110	}
4111	return ret;
4112	}
4113
4114	/****************************************************************************
4115	Calls from UNIX extensions - POSIX ACL set.
4116	If num_def_acls == 0 then read/modify/write acl after removing all entries
4117	except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4118	****************************************************************************/
4119
4120	BOOL set_unix_posix_acl(connection_struct conn, files_struct fsp, const char fname, uint16 num_acls, const char pdata)
4121	{
4122	SMB_ACL_T file_acl = NULL;
4123
4124	if (!num_acls) {
4125	/* Remove the ACL from the file. */
4126	return remove_posix_acl(conn, fsp, fname);
4127	}
4128
4129	if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4130	return False;
4131	}
4132
4133	if (fsp && fsp->fh->fd != -1) {
4134	/* The preferred way - use an open fd. */
4135	if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, file_acl) == -1) {
4136	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4137	fname, strerror(errno) ));
4138	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4139	return False;
4140	}
4141	} else {
4142	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4143	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4144	fname, strerror(errno) ));
4145	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4146	return False;
4147	}
4148	}
4149
4150	DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4151	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4152	return True;
4153	}
4154
4155	/****************************************************************************
4156	Helper function that gets a security descriptor by connection and
4157	file name.
4158	NOTE: This is transitional, in the sense that SMB_VFS_GET_NT_ACL really
4159	should not get a files_struct pointer but a connection_struct ptr
4160	(automatic by the vfs handle) and the file name and _use_ that!
4161	****************************************************************************/
4162	static NTSTATUS conn_get_nt_acl(TALLOC_CTX *mem_ctx,
4163	struct connection_struct *conn,
4164	const char *fname,
4165	SMB_STRUCT_STAT *psbuf,
4166	struct security_descriptor_info **psd)
4167	{
4168	NTSTATUS status;
4169	struct files_struct *fsp = NULL;
4170	struct security_descriptor_info *secdesc = NULL;
4171	size_t secdesc_size;
4172
4173	if (!VALID_STAT(*psbuf)) {
4174	if (SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4175	return map_nt_error_from_unix(errno);
4176	}
4177	}
4178
4179	/* fake a files_struct ptr: */
4180
4181	if (S_ISDIR(psbuf->st_mode)) {
4182	status = open_directory(conn, fname, psbuf,
4183	READ_CONTROL_ACCESS,
4184	FILE_SHARE_READ\|FILE_SHARE_WRITE,
4185	FILE_OPEN,
4186	0,
4187	FILE_ATTRIBUTE_DIRECTORY,
4188	NULL, &fsp);
4189	}
4190	else {
4191	status = open_file_stat(conn, fname, psbuf, &fsp);
4192	}
4193
4194	if (!NT_STATUS_IS_OK(status)) {
4195	DEBUG(3, ("Unable to open file %s: %s\n", fname,
4196	nt_errstr(status)));
4197	return status;
4198	}
4199
4200	secdesc_size = SMB_VFS_GET_NT_ACL(fsp, fname,
4201	(OWNER_SECURITY_INFORMATION \|
4202	GROUP_SECURITY_INFORMATION \|
4203	DACL_SECURITY_INFORMATION),
4204	&secdesc);
4205	if (secdesc_size == 0) {
4206	DEBUG(5, ("Unable to get NT ACL for file %s\n", fname));
4207	status = NT_STATUS_ACCESS_DENIED;
4208	goto done;
4209	}
4210
4211	*psd = talloc_move(mem_ctx, &secdesc);
4212	status = NT_STATUS_OK;
4213
4214	done:
4215	close_file(fsp, NORMAL_CLOSE);
4216	return status;
4217	}
4218
4219	static BOOL can_access_file_acl(struct connection_struct *conn,
4220	const char * fname, SMB_STRUCT_STAT *psbuf,
4221	uint32_t access_mask)
4222	{
4223	BOOL result;
4224	NTSTATUS status;
4225	uint32_t access_granted;
4226	struct security_descriptor_info *secdesc = NULL;
4227
4228	status = conn_get_nt_acl(tmp_talloc_ctx(), conn, fname, psbuf, &secdesc);
4229	if (!NT_STATUS_IS_OK(status)) {
4230	DEBUG(5, ("Could not get acl: %s\n", nt_errstr(status)));
4231	return False;
4232	}
4233
4234	result = se_access_check(secdesc, current_user.nt_user_token,
4235	access_mask, &access_granted, &status);
4236	TALLOC_FREE(secdesc);
4237	return result;
4238	}
4239
4240	/****************************************************************************
4241	Actually emulate the in-kernel access checking for delete access. We need
4242	this to successfully return ACCESS_DENIED on a file open for delete access.
4243	****************************************************************************/
4244
4245	BOOL can_delete_file_in_directory(connection_struct conn, const char fname)
4246	{
4247	SMB_STRUCT_STAT sbuf;
4248	pstring dname;
4249
4250	if (!CAN_WRITE(conn)) {
4251	return False;
4252	}
4253
4254	/* Get the parent directory permission mask and owners. */
4255	pstrcpy(dname, parent_dirname(fname));
4256	if(SMB_VFS_STAT(conn, dname, &sbuf) != 0) {
4257	return False;
4258	}
4259
4260	/* fast paths first */
4261
4262	if (!S_ISDIR(sbuf.st_mode)) {
4263	return False;
4264	}
4265	if (current_user.ut.uid == 0 \|\| conn->admin_user) {
4266	/* I'm sorry sir, I didn't know you were root... */
4267	return True;
4268	}
4269
4270	/* Check primary owner write access. */
4271	if (current_user.ut.uid == sbuf.st_uid) {
4272	return (sbuf.st_mode & S_IWUSR) ? True : False;
4273	}
4274
4275	#ifdef S_ISVTX
4276	/* sticky bit means delete only by owner or root. */
4277	if (sbuf.st_mode & S_ISVTX) {
4278	SMB_STRUCT_STAT sbuf_file;
4279	if(SMB_VFS_STAT(conn, fname, &sbuf_file) != 0) {
4280	if (errno == ENOENT) {
4281	/* If the file doesn't already exist then
4282	* yes we'll be able to delete it. */
4283	return True;
4284	}
4285	return False;
4286	}
4287	/*
4288	* Patch from SATOH Fumiyasu <[email protected]>
4289	* for bug #3348. Don't assume owning sticky bit
4290	* directory means write access allowed.
4291	*/
4292	if (current_user.ut.uid != sbuf_file.st_uid) {
4293	return False;
4294	}
4295	}
4296	#endif
4297
4298	/* now for ACL checks */
4299
4300	return can_access_file_acl(conn, dname, &sbuf, FILE_WRITE_DATA);
4301	}
4302
4303	/****************************************************************************
4304	Actually emulate the in-kernel access checking for read/write access. We need
4305	this to successfully check for ability to write for dos filetimes.
4306	Note this doesn't take into account share write permissions.
4307	****************************************************************************/
4308
4309	BOOL can_access_file(connection_struct conn, const char fname, SMB_STRUCT_STAT *psbuf, uint32 access_mask)
4310	{
4311	if (!(access_mask & (FILE_READ_DATA\|FILE_WRITE_DATA))) {
4312	return False;
4313	}
4314	access_mask &= (FILE_READ_DATA\|FILE_WRITE_DATA);
4315
4316	/* some fast paths first */
4317
4318	DEBUG(10,("can_access_file: requesting 0x%x on file %s\n",
4319	(unsigned int)access_mask, fname ));
4320
4321	#ifndef __OS2__
4322	/* Samba always runs as root on OS/2 */
4323	if (current_user.ut.uid == 0 \|\| conn->admin_user) {
4324	/* I'm sorry sir, I didn't know you were root... */
4325	return True;
4326	}
4327	#endif
4328	if (!VALID_STAT(*psbuf)) {
4329	/* Get the file permission mask and owners. */
4330	if(SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4331	return False;
4332	}
4333	}
4334
4335	/* Check primary owner access. */
4336	if (current_user.ut.uid == psbuf->st_uid) {
4337	switch (access_mask) {
4338	case FILE_READ_DATA:
4339	return (psbuf->st_mode & S_IRUSR) ? True : False;
4340
4341	case FILE_WRITE_DATA:
4342	return (psbuf->st_mode & S_IWUSR) ? True : False;
4343
4344	default: /* FILE_READ_DATA\|FILE_WRITE_DATA */
4345
4346	if ((psbuf->st_mode & (S_IWUSR\|S_IRUSR)) == (S_IWUSR\|S_IRUSR)) {
4347	return True;
4348	} else {
4349	return False;
4350	}
4351	}
4352	}
4353
4354	/* now for ACL checks */
4355
4356	return can_access_file_acl(conn, fname, psbuf, access_mask);
4357	}
4358
4359	/****************************************************************************
4360	Userspace check for write access.
4361	Note this doesn't take into account share write permissions.
4362	****************************************************************************/
4363
4364	BOOL can_write_to_file(connection_struct conn, const char fname, SMB_STRUCT_STAT *psbuf)
4365	{
4366	return can_access_file(conn, fname, psbuf, FILE_WRITE_DATA);
4367	}
4368
4369	/********************************************************************
4370	Pull the NT ACL from a file on disk or the OpenEventlog() access
4371	check. Caller is responsible for freeing the returned security
4372	descriptor via TALLOC_FREE(). This is designed for dealing with
4373	user space access checks in smbd outside of the VFS. For example,
4374	checking access rights in OpenEventlog().
4375
4376	Assume we are dealing with files (for now)
4377	********************************************************************/
4378
4379	SEC_DESC* get_nt_acl_no_snum( TALLOC_CTX ctx, const char fname)
4380	{
4381	SEC_DESC psd, ret_sd;
4382	connection_struct conn;
4383	files_struct finfo;
4384	struct fd_handle fh;
4385	pstring path;
4386	pstring filename;
4387
4388	ZERO_STRUCT( conn );
4389
4390	if ( !(conn.mem_ctx = talloc_init( "novfs_get_nt_acl" )) ) {
4391	DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4392	return NULL;
4393	}
4394
4395	if (!(conn.params = TALLOC_P(conn.mem_ctx, struct share_params))) {
4396	DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4397	TALLOC_FREE(conn.mem_ctx);
4398	return NULL;
4399	}
4400
4401	conn.params->service = -1;
4402
4403	pstrcpy( path, "/" );
4404	set_conn_connectpath(&conn, path);
4405
4406	if (!smbd_vfs_init(&conn)) {
4407	DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4408	conn_free_internal( &conn );
4409	return NULL;
4410	}
4411
4412	ZERO_STRUCT( finfo );
4413	ZERO_STRUCT( fh );
4414
4415	finfo.fnum = -1;
4416	finfo.conn = &conn;
4417	finfo.fh = &fh;
4418	finfo.fh->fd = -1;
4419	pstrcpy( filename, fname );
4420	finfo.fsp_name = filename;
4421
4422	if (get_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd ) == 0) {
4423	DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4424	conn_free_internal( &conn );
4425	return NULL;
4426	}
4427
4428	ret_sd = dup_sec_desc( ctx, psd );
4429
4430	conn_free_internal( &conn );
4431
4432	return ret_sd;
4433	}

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