7756f8f3abff372a3992dcc88794abec0e9d6c02
[ira/wip.git] / source3 / modules / nfs4_acls.c
1 /*
2  * NFS4 ACL handling
3  *
4  * Copyright (C) Jim McDonough, 2006
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include "includes.h"
21 #include "nfs4_acls.h"
22
23 #undef DBGC_CLASS
24 #define DBGC_CLASS DBGC_ACLS
25
26 #define SMBACL4_PARAM_TYPE_NAME "nfs4"
27
28 extern const struct generic_mapping file_generic_mapping;
29
30 #define SMB_ACE4_INT_MAGIC 0x76F8A967
31 typedef struct _SMB_ACE4_INT_T
32 {
33         uint32  magic;
34         SMB_ACE4PROP_T  prop;
35         void    *next;
36 } SMB_ACE4_INT_T;
37
38 #define SMB_ACL4_INT_MAGIC 0x29A3E792
39 typedef struct _SMB_ACL4_INT_T
40 {
41         uint32  magic;
42         uint32  naces;
43         SMB_ACE4_INT_T  *first;
44         SMB_ACE4_INT_T  *last;
45 } SMB_ACL4_INT_T;
46
47 static SMB_ACL4_INT_T *get_validated_aclint(SMB4ACL_T *theacl)
48 {
49         SMB_ACL4_INT_T *aclint = (SMB_ACL4_INT_T *)theacl;
50         if (theacl==NULL)
51         {
52                 DEBUG(2, ("acl is NULL\n"));
53                 errno = EINVAL;
54                 return NULL;
55         }
56         if (aclint->magic!=SMB_ACL4_INT_MAGIC)
57         {
58                 DEBUG(2, ("aclint bad magic 0x%x\n", aclint->magic));
59                 errno = EINVAL;
60                 return NULL;
61         }
62         return aclint;
63 }
64
65 static SMB_ACE4_INT_T *get_validated_aceint(SMB4ACE_T *ace)
66 {
67         SMB_ACE4_INT_T *aceint = (SMB_ACE4_INT_T *)ace;
68         if (ace==NULL)
69         {
70                 DEBUG(2, ("ace is NULL\n"));
71                 errno = EINVAL;
72                 return NULL;
73         }
74         if (aceint->magic!=SMB_ACE4_INT_MAGIC)
75         {
76                 DEBUG(2, ("aceint bad magic 0x%x\n", aceint->magic));
77                 errno = EINVAL;
78                 return NULL;
79         }
80         return aceint;
81 }
82
83 SMB4ACL_T *smb_create_smb4acl(void)
84 {
85         TALLOC_CTX *mem_ctx = talloc_tos();
86         SMB_ACL4_INT_T  *theacl = (SMB_ACL4_INT_T *)TALLOC_ZERO_SIZE(mem_ctx, sizeof(SMB_ACL4_INT_T));
87         if (theacl==NULL)
88         {
89                 DEBUG(0, ("TALLOC_SIZE failed\n"));
90                 errno = ENOMEM;
91                 return NULL;
92         }
93         theacl->magic = SMB_ACL4_INT_MAGIC;
94         /* theacl->first, last = NULL not needed */
95         return (SMB4ACL_T *)theacl;
96 }
97
98 SMB4ACE_T *smb_add_ace4(SMB4ACL_T *theacl, SMB_ACE4PROP_T *prop)
99 {
100         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
101         TALLOC_CTX *mem_ctx = talloc_tos();
102         SMB_ACE4_INT_T *ace;
103
104         ace = (SMB_ACE4_INT_T *)TALLOC_ZERO_SIZE(mem_ctx, sizeof(SMB_ACE4_INT_T));
105         if (ace==NULL)
106         {
107                 DEBUG(0, ("TALLOC_SIZE failed\n"));
108                 errno = ENOMEM;
109                 return NULL;
110         }
111         ace->magic = SMB_ACE4_INT_MAGIC;
112         /* ace->next = NULL not needed */
113         memcpy(&ace->prop, prop, sizeof(SMB_ACE4PROP_T));
114
115         if (aclint->first==NULL)
116         {
117                 aclint->first = ace;
118                 aclint->last = ace;
119         } else {
120                 aclint->last->next = (void *)ace;
121                 aclint->last = ace;
122         }
123         aclint->naces++;
124
125         return (SMB4ACE_T *)ace;
126 }
127
128 SMB_ACE4PROP_T *smb_get_ace4(SMB4ACE_T *ace)
129 {
130         SMB_ACE4_INT_T *aceint = get_validated_aceint(ace);
131         if (aceint==NULL)
132                 return NULL;
133
134         return &aceint->prop;
135 }
136
137 SMB4ACE_T *smb_next_ace4(SMB4ACE_T *ace)
138 {
139         SMB_ACE4_INT_T *aceint = get_validated_aceint(ace);
140         if (aceint==NULL)
141                 return NULL;
142
143         return (SMB4ACE_T *)aceint->next;
144 }
145
146 SMB4ACE_T *smb_first_ace4(SMB4ACL_T *theacl)
147 {
148         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
149         if (aclint==NULL)
150                 return NULL;
151
152         return (SMB4ACE_T *)aclint->first;
153 }
154
155 uint32 smb_get_naces(SMB4ACL_T *theacl)
156 {
157         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
158         if (aclint==NULL)
159                 return 0;
160
161         return aclint->naces;
162 }
163
164 static int smbacl4_GetFileOwner(struct connection_struct *conn,
165                                 const char *filename,
166                                 SMB_STRUCT_STAT *psbuf)
167 {
168         memset(psbuf, 0, sizeof(SMB_STRUCT_STAT));
169
170         /* Get the stat struct for the owner info. */
171         if (SMB_VFS_STAT(conn, filename, psbuf) != 0)
172         {
173                 DEBUG(8, ("SMB_VFS_STAT failed with error %s\n",
174                         strerror(errno)));
175                 return -1;
176         }
177
178         return 0;
179 }
180
181 static int smbacl4_fGetFileOwner(files_struct *fsp, SMB_STRUCT_STAT *psbuf)
182 {
183         memset(psbuf, 0, sizeof(SMB_STRUCT_STAT));
184
185         if (fsp->is_directory || fsp->fh->fd == -1) {
186                 return smbacl4_GetFileOwner(fsp->conn, fsp->fsp_name, psbuf);
187         }
188         if (SMB_VFS_FSTAT(fsp, psbuf) != 0)
189         {
190                 DEBUG(8, ("SMB_VFS_FSTAT failed with error %s\n",
191                         strerror(errno)));
192                 return -1;
193         }
194
195         return 0;
196 }
197
198 static bool smbacl4_nfs42win(TALLOC_CTX *mem_ctx, SMB4ACL_T *theacl, /* in */
199         DOM_SID *psid_owner, /* in */
200         DOM_SID *psid_group, /* in */
201         bool is_directory, /* in */
202         SEC_ACE **ppnt_ace_list, /* out */
203         int *pgood_aces /* out */
204 )
205 {
206         SMB_ACL4_INT_T *aclint = (SMB_ACL4_INT_T *)theacl;
207         SMB_ACE4_INT_T *aceint;
208         SEC_ACE *nt_ace_list = NULL;
209         int good_aces = 0;
210
211         DEBUG(10, ("smbacl_nfs42win entered"));
212
213         aclint = get_validated_aclint(theacl);
214         /* We do not check for naces being 0 or theacl being NULL here because it is done upstream */
215         /* in smb_get_nt_acl_nfs4(). */
216         nt_ace_list = (SEC_ACE *)TALLOC_ZERO_SIZE(mem_ctx, aclint->naces * sizeof(SEC_ACE));
217         if (nt_ace_list==NULL)
218         {
219                 DEBUG(10, ("talloc error"));
220                 errno = ENOMEM;
221                 return False;
222         }
223
224         for (aceint=aclint->first; aceint!=NULL; aceint=(SMB_ACE4_INT_T *)aceint->next) {
225                 uint32_t mask;
226                 DOM_SID sid;
227                 SMB_ACE4PROP_T  *ace = &aceint->prop;
228
229                 DEBUG(10, ("magic: 0x%x, type: %d, iflags: %x, flags: %x, mask: %x, "
230                         "who: %d\n", aceint->magic, ace->aceType, ace->flags,
231                         ace->aceFlags, ace->aceMask, ace->who.id));
232
233                 SMB_ASSERT(aceint->magic==SMB_ACE4_INT_MAGIC);
234
235                 if (ace->flags & SMB_ACE4_ID_SPECIAL) {
236                         switch (ace->who.special_id) {
237                         case SMB_ACE4_WHO_OWNER:
238                                 sid_copy(&sid, psid_owner);
239                                 break;
240                         case SMB_ACE4_WHO_GROUP:
241                                 sid_copy(&sid, psid_group);
242                                 break;
243                         case SMB_ACE4_WHO_EVERYONE:
244                                 sid_copy(&sid, &global_sid_World);
245                                 break;
246                         default:
247                                 DEBUG(8, ("invalid special who id %d "
248                                         "ignored\n", ace->who.special_id));
249                         }
250                 } else {
251                         if (ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP) {
252                                 gid_to_sid(&sid, ace->who.gid);
253                         } else {
254                                 uid_to_sid(&sid, ace->who.uid);
255                         }
256                 }
257                 DEBUG(10, ("mapped %d to %s\n", ace->who.id,
258                            sid_string_dbg(&sid)));
259
260                 if (is_directory && (ace->aceMask & SMB_ACE4_ADD_FILE)) {
261                         ace->aceMask |= SMB_ACE4_DELETE_CHILD;
262                 }
263
264                 mask = ace->aceMask;
265                 init_sec_ace(&nt_ace_list[good_aces++], &sid,
266                         ace->aceType, mask,
267                         ace->aceFlags & 0xf);
268         }
269
270         *ppnt_ace_list = nt_ace_list;
271         *pgood_aces = good_aces;
272
273         return True;
274 }
275
276 static NTSTATUS smb_get_nt_acl_nfs4_common(const SMB_STRUCT_STAT *sbuf,
277         uint32 security_info,
278         SEC_DESC **ppdesc, SMB4ACL_T *theacl)
279 {
280         int     good_aces = 0;
281         DOM_SID sid_owner, sid_group;
282         size_t sd_size = 0;
283         SEC_ACE *nt_ace_list = NULL;
284         SEC_ACL *psa = NULL;
285         TALLOC_CTX *mem_ctx = talloc_tos();
286
287         if (theacl==NULL || smb_get_naces(theacl)==0)
288                 return NT_STATUS_ACCESS_DENIED; /* special because we
289                                                  * shouldn't alloc 0 for
290                                                  * win */
291
292         uid_to_sid(&sid_owner, sbuf->st_uid);
293         gid_to_sid(&sid_group, sbuf->st_gid);
294
295         if (smbacl4_nfs42win(mem_ctx, theacl, &sid_owner, &sid_group, S_ISDIR(sbuf->st_mode),
296                                 &nt_ace_list, &good_aces)==False) {
297                 DEBUG(8,("smbacl4_nfs42win failed\n"));
298                 return map_nt_error_from_unix(errno);
299         }
300
301         psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION, good_aces, nt_ace_list);
302         if (psa == NULL) {
303                 DEBUG(2,("make_sec_acl failed\n"));
304                 return NT_STATUS_NO_MEMORY;
305         }
306
307         DEBUG(10,("after make sec_acl\n"));
308         *ppdesc = make_sec_desc(mem_ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE,
309                                 (security_info & OWNER_SECURITY_INFORMATION) ? &sid_owner : NULL,
310                                 (security_info & GROUP_SECURITY_INFORMATION) ? &sid_group : NULL,
311                                 NULL, psa, &sd_size);
312         if (*ppdesc==NULL) {
313                 DEBUG(2,("make_sec_desc failed\n"));
314                 return NT_STATUS_NO_MEMORY;
315         }
316
317         DEBUG(10, ("smb_get_nt_acl_nfs4_common successfully exited with sd_size %d\n",
318                    ndr_size_security_descriptor(*ppdesc, 0)));
319
320         return NT_STATUS_OK;
321 }
322
323 NTSTATUS smb_fget_nt_acl_nfs4(files_struct *fsp,
324                                uint32 security_info,
325                                SEC_DESC **ppdesc, SMB4ACL_T *theacl)
326 {
327         SMB_STRUCT_STAT sbuf;
328
329         DEBUG(10, ("smb_fget_nt_acl_nfs4 invoked for %s\n", fsp->fsp_name));
330
331         if (smbacl4_fGetFileOwner(fsp, &sbuf)) {
332                 return map_nt_error_from_unix(errno);
333         }
334
335         return smb_get_nt_acl_nfs4_common(&sbuf, security_info, ppdesc, theacl);
336 }
337
338 NTSTATUS smb_get_nt_acl_nfs4(struct connection_struct *conn,
339                               const char *name,
340                               uint32 security_info,
341                               SEC_DESC **ppdesc, SMB4ACL_T *theacl)
342 {
343         SMB_STRUCT_STAT sbuf;
344
345         DEBUG(10, ("smb_get_nt_acl_nfs4 invoked for %s\n", name));
346
347         if (smbacl4_GetFileOwner(conn, name, &sbuf)) {
348                 return map_nt_error_from_unix(errno);
349         }
350
351         return smb_get_nt_acl_nfs4_common(&sbuf, security_info, ppdesc, theacl);
352 }
353
354 enum smbacl4_mode_enum {e_simple=0, e_special=1};
355 enum smbacl4_acedup_enum {e_dontcare=0, e_reject=1, e_ignore=2, e_merge=3};
356
357 typedef struct _smbacl4_vfs_params {
358         enum smbacl4_mode_enum mode;
359         bool do_chown;
360         enum smbacl4_acedup_enum acedup;
361         struct db_context *sid_mapping_table;
362 } smbacl4_vfs_params;
363
364 /*
365  * Gather special parameters for NFS4 ACL handling
366  */
367 static int smbacl4_get_vfs_params(
368         const char *type_name,
369         files_struct *fsp,
370         smbacl4_vfs_params *params
371 )
372 {
373         static const struct enum_list enum_smbacl4_modes[] = {
374                 { e_simple, "simple" },
375                 { e_special, "special" }
376         };
377         static const struct enum_list enum_smbacl4_acedups[] = {
378                 { e_dontcare, "dontcare" },
379                 { e_reject, "reject" },
380                 { e_ignore, "ignore" },
381                 { e_merge, "merge" },
382         };
383
384         memset(params, 0, sizeof(smbacl4_vfs_params));
385         params->mode = (enum smbacl4_mode_enum)lp_parm_enum(
386                 SNUM(fsp->conn), type_name,
387                 "mode", enum_smbacl4_modes, e_simple);
388         params->do_chown = lp_parm_bool(SNUM(fsp->conn), type_name,
389                 "chown", True);
390         params->acedup = (enum smbacl4_acedup_enum)lp_parm_enum(
391                 SNUM(fsp->conn), type_name,
392                 "acedup", enum_smbacl4_acedups, e_dontcare);
393
394         DEBUG(10, ("mode:%s, do_chown:%s, acedup: %s\n",
395                 enum_smbacl4_modes[params->mode].name,
396                 params->do_chown ? "true" : "false",
397                 enum_smbacl4_acedups[params->acedup].name));
398
399         return 0;
400 }
401
402 static void smbacl4_dump_nfs4acl(int level, SMB4ACL_T *theacl)
403 {
404         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
405         SMB_ACE4_INT_T *aceint;
406
407         DEBUG(level, ("NFS4ACL: size=%d\n", aclint->naces));
408
409         for(aceint = aclint->first; aceint!=NULL; aceint=(SMB_ACE4_INT_T *)aceint->next) {
410                 SMB_ACE4PROP_T *ace = &aceint->prop;
411
412                 DEBUG(level, ("\tACE: type=%d, flags=0x%x, fflags=0x%x, mask=0x%x, id=%d\n",
413                         ace->aceType,
414                         ace->aceFlags, ace->flags,
415                         ace->aceMask,
416                         ace->who.id));
417         }
418 }
419
420 /* 
421  * Find 2 NFS4 who-special ACE property (non-copy!!!)
422  * match nonzero if "special" and who is equal
423  * return ace if found matching; otherwise NULL
424  */
425 static SMB_ACE4PROP_T *smbacl4_find_equal_special(
426         SMB4ACL_T *theacl,
427         SMB_ACE4PROP_T *aceNew)
428 {
429         SMB_ACL4_INT_T *aclint = get_validated_aclint(theacl);
430         SMB_ACE4_INT_T *aceint;
431
432         for(aceint = aclint->first; aceint!=NULL; aceint=(SMB_ACE4_INT_T *)aceint->next) {
433                 SMB_ACE4PROP_T *ace = &aceint->prop;
434
435                 if (ace->flags == aceNew->flags &&
436                         ace->aceType==aceNew->aceType &&
437                         (ace->aceFlags&SMB_ACE4_IDENTIFIER_GROUP)==
438                         (aceNew->aceFlags&SMB_ACE4_IDENTIFIER_GROUP)
439                 ) {
440                         /* keep type safety; e.g. gid is an u.short */
441                         if (ace->flags & SMB_ACE4_ID_SPECIAL)
442                         {
443                                 if (ace->who.special_id==aceNew->who.special_id)
444                                         return ace;
445                         } else {
446                                 if (ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP)
447                                 {
448                                         if (ace->who.gid==aceNew->who.gid)
449                                                 return ace;
450                                 } else {
451                                         if (ace->who.uid==aceNew->who.uid)
452                                                 return ace;
453                                 }
454                         }
455                 }
456         }
457
458         return NULL;
459 }
460
461 static bool nfs4_map_sid(smbacl4_vfs_params *params, const DOM_SID *src,
462                          DOM_SID *dst)
463 {
464         static struct db_context *mapping_db = NULL;
465         TDB_DATA data;
466         
467         if (mapping_db == NULL) {
468                 const char *dbname = lp_parm_const_string(
469                         -1, SMBACL4_PARAM_TYPE_NAME, "sidmap", NULL);
470                 
471                 if (dbname == NULL) {
472                         DEBUG(10, ("%s:sidmap not defined\n",
473                                    SMBACL4_PARAM_TYPE_NAME));
474                         return False;
475                 }
476                 
477                 become_root();
478                 mapping_db = db_open(NULL, dbname, 0, TDB_DEFAULT,
479                                      O_RDONLY, 0600);
480                 unbecome_root();
481                 
482                 if (mapping_db == NULL) {
483                         DEBUG(1, ("could not open sidmap: %s\n",
484                                   strerror(errno)));
485                         return False;
486                 }
487         }
488         
489         if (mapping_db->fetch(mapping_db, NULL,
490                               string_term_tdb_data(sid_string_tos(src)),
491                               &data) == -1) {
492                 DEBUG(10, ("could not find mapping for SID %s\n",
493                            sid_string_dbg(src)));
494                 return False;
495         }
496         
497         if ((data.dptr == NULL) || (data.dsize <= 0)
498             || (data.dptr[data.dsize-1] != '\0')) {
499                 DEBUG(5, ("invalid mapping for SID %s\n",
500                           sid_string_dbg(src)));
501                 TALLOC_FREE(data.dptr);
502                 return False;
503         }
504         
505         if (!string_to_sid(dst, (char *)data.dptr)) {
506                 DEBUG(1, ("invalid mapping %s for SID %s\n",
507                           (char *)data.dptr, sid_string_dbg(src)));
508                 TALLOC_FREE(data.dptr);
509                 return False;
510         }
511
512         TALLOC_FREE(data.dptr);
513         
514         return True;
515 }
516
517 static bool smbacl4_fill_ace4(
518         TALLOC_CTX *mem_ctx,
519         const char *filename,
520         smbacl4_vfs_params *params,
521         uid_t ownerUID,
522         gid_t ownerGID,
523         const SEC_ACE *ace_nt, /* input */
524         SMB_ACE4PROP_T *ace_v4 /* output */
525 )
526 {
527         DEBUG(10, ("got ace for %s\n", sid_string_dbg(&ace_nt->trustee)));
528
529         memset(ace_v4, 0, sizeof(SMB_ACE4PROP_T));
530         ace_v4->aceType = ace_nt->type; /* only ACCESS|DENY supported right now */
531         ace_v4->aceFlags = ace_nt->flags & SEC_ACE_FLAG_VALID_INHERIT;
532         ace_v4->aceMask = ace_nt->access_mask &
533                 (STD_RIGHT_ALL_ACCESS | SA_RIGHT_FILE_ALL_ACCESS);
534
535         se_map_generic(&ace_v4->aceMask, &file_generic_mapping);
536
537         if (ace_v4->aceFlags!=ace_nt->flags)
538                 DEBUG(9, ("ace_v4->aceFlags(0x%x)!=ace_nt->flags(0x%x)\n",
539                         ace_v4->aceFlags, ace_nt->flags));
540
541         if (ace_v4->aceMask!=ace_nt->access_mask)
542                 DEBUG(9, ("ace_v4->aceMask(0x%x)!=ace_nt->access_mask(0x%x)\n",
543                         ace_v4->aceMask, ace_nt->access_mask));
544
545         if (sid_equal(&ace_nt->trustee, &global_sid_World)) {
546                 ace_v4->who.special_id = SMB_ACE4_WHO_EVERYONE;
547                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
548         } else {
549                 const char *dom, *name;
550                 enum lsa_SidType type;
551                 uid_t uid;
552                 gid_t gid;
553                 DOM_SID sid;
554                 
555                 sid_copy(&sid, &ace_nt->trustee);
556                 
557                 if (!lookup_sid(mem_ctx, &sid, &dom, &name, &type)) {
558                         
559                         DOM_SID mapped;
560                         
561                         if (!nfs4_map_sid(params, &sid, &mapped)) {
562                                 DEBUG(1, ("nfs4_acls.c: file [%s]: SID %s "
563                                           "unknown\n", filename, sid_string_dbg(&sid)));
564                                 errno = EINVAL;
565                                 return False;
566                         }
567                         
568                         DEBUG(2, ("nfs4_acls.c: file [%s]: mapped SID %s "
569                                   "to %s\n", filename, sid_string_dbg(&sid), sid_string_dbg(&mapped)));
570                         
571                         if (!lookup_sid(mem_ctx, &mapped, &dom,
572                                         &name, &type)) {
573                                 DEBUG(1, ("nfs4_acls.c: file [%s]: SID %s "
574                                           "mapped from %s is unknown\n",
575                                           filename, sid_string_dbg(&mapped), sid_string_dbg(&sid)));
576                                 errno = EINVAL;
577                                 return False;
578                         }
579                         
580                         sid_copy(&sid, &mapped);
581                 }
582                 
583                 if (type == SID_NAME_USER) {
584                         if (!sid_to_uid(&sid, &uid)) {
585                                 DEBUG(1, ("nfs4_acls.c: file [%s]: could not "
586                                           "convert %s to uid\n", filename,
587                                           sid_string_dbg(&sid)));
588                                 return False;
589                         }
590
591                         if (params->mode==e_special && uid==ownerUID) {
592                                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
593                                 ace_v4->who.special_id = SMB_ACE4_WHO_OWNER;
594                         } else {
595                                 ace_v4->who.uid = uid;
596                         }
597                 } else { /* else group? - TODO check it... */
598                         if (!sid_to_gid(&sid, &gid)) {
599                                 DEBUG(1, ("nfs4_acls.c: file [%s]: could not "
600                                           "convert %s to gid\n", filename,
601                                           sid_string_dbg(&sid)));
602                                 return False;
603                         }
604                                 
605                         ace_v4->aceFlags |= SMB_ACE4_IDENTIFIER_GROUP;
606
607                         if (params->mode==e_special && gid==ownerGID) {
608                                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
609                                 ace_v4->who.special_id = SMB_ACE4_WHO_GROUP;
610                         } else {
611                                 ace_v4->who.gid = gid;
612                         }
613                 }
614         }
615
616         return True; /* OK */
617 }
618
619 static int smbacl4_MergeIgnoreReject(
620         enum smbacl4_acedup_enum acedup,
621         SMB4ACL_T *theacl, /* may modify it */
622         SMB_ACE4PROP_T *ace, /* the "new" ACE */
623         bool    *paddNewACE,
624         int     i
625 )
626 {
627         int     result = 0;
628         SMB_ACE4PROP_T *ace4found = smbacl4_find_equal_special(theacl, ace);
629         if (ace4found)
630         {
631                 switch(acedup)
632                 {
633                 case e_merge: /* "merge" flags */
634                         *paddNewACE = False;
635                         ace4found->aceFlags |= ace->aceFlags;
636                         ace4found->aceMask |= ace->aceMask;
637                         break;
638                 case e_ignore: /* leave out this record */
639                         *paddNewACE = False;
640                         break;
641                 case e_reject: /* do an error */
642                         DEBUG(8, ("ACL rejected by duplicate nt ace#%d\n", i));
643                         errno = EINVAL; /* SHOULD be set on any _real_ error */
644                         result = -1;
645                         break;
646                 default:
647                         break;
648                 }
649         }
650         return result;
651 }
652
653 static SMB4ACL_T *smbacl4_win2nfs4(
654         const char *filename,
655         const SEC_ACL *dacl,
656         smbacl4_vfs_params *pparams,
657         uid_t ownerUID,
658         gid_t ownerGID
659 )
660 {
661         SMB4ACL_T *theacl;
662         uint32  i;
663         TALLOC_CTX *mem_ctx = talloc_tos();
664
665         DEBUG(10, ("smbacl4_win2nfs4 invoked\n"));
666
667         theacl = smb_create_smb4acl();
668         if (theacl==NULL)
669                 return NULL;
670
671         for(i=0; i<dacl->num_aces; i++) {
672                 SMB_ACE4PROP_T  ace_v4;
673                 bool    addNewACE = True;
674
675                 if (!smbacl4_fill_ace4(mem_ctx, filename, pparams,
676                                        ownerUID, ownerGID,
677                                        dacl->aces + i, &ace_v4)) {
678                         DEBUG(3, ("Could not fill ace for file %s, SID %s\n",
679                                   filename,
680                                   sid_string_dbg(&((dacl->aces+i)->trustee))));
681                         continue;
682                 }
683
684                 if (pparams->acedup!=e_dontcare) {
685                         if (smbacl4_MergeIgnoreReject(pparams->acedup, theacl,
686                                 &ace_v4, &addNewACE, i))
687                                 return NULL;
688                 }
689
690                 if (addNewACE)
691                         smb_add_ace4(theacl, &ace_v4);
692         }
693
694         return theacl;
695 }
696
697 NTSTATUS smb_set_nt_acl_nfs4(files_struct *fsp,
698         uint32 security_info_sent,
699         const SEC_DESC *psd,
700         set_nfs4acl_native_fn_t set_nfs4_native)
701 {
702         smbacl4_vfs_params params;
703         SMB4ACL_T *theacl = NULL;
704         bool    result;
705
706         SMB_STRUCT_STAT sbuf;
707         bool set_acl_as_root = false;
708         uid_t newUID = (uid_t)-1;
709         gid_t newGID = (gid_t)-1;
710         int saved_errno;
711
712         DEBUG(10, ("smb_set_nt_acl_nfs4 invoked for %s\n", fsp->fsp_name));
713
714         if ((security_info_sent & (DACL_SECURITY_INFORMATION |
715                 GROUP_SECURITY_INFORMATION | OWNER_SECURITY_INFORMATION)) == 0)
716         {
717                 DEBUG(9, ("security_info_sent (0x%x) ignored\n",
718                         security_info_sent));
719                 return NT_STATUS_OK; /* won't show error - later to be refined... */
720         }
721
722         /* Special behaviours */
723         if (smbacl4_get_vfs_params(SMBACL4_PARAM_TYPE_NAME, fsp, &params))
724                 return NT_STATUS_NO_MEMORY;
725
726         if (smbacl4_fGetFileOwner(fsp, &sbuf))
727                 return map_nt_error_from_unix(errno);
728
729         if (params.do_chown) {
730                 /* chown logic is a copy/paste from posix_acl.c:set_nt_acl */
731                 NTSTATUS status = unpack_nt_owners(SNUM(fsp->conn), &newUID, &newGID, security_info_sent, psd);
732                 if (!NT_STATUS_IS_OK(status)) {
733                         DEBUG(8, ("unpack_nt_owners failed"));
734                         return status;
735                 }
736                 if (((newUID != (uid_t)-1) && (sbuf.st_uid != newUID)) ||
737                     ((newGID != (gid_t)-1) && (sbuf.st_gid != newGID))) {
738                         if(try_chown(fsp->conn, fsp->fsp_name, newUID, newGID)) {
739                                 DEBUG(3,("chown %s, %u, %u failed. Error = %s.\n",
740                                          fsp->fsp_name, (unsigned int)newUID, (unsigned int)newGID, 
741                                          strerror(errno)));
742                                 return map_nt_error_from_unix(errno);
743                         }
744
745                         DEBUG(10,("chown %s, %u, %u succeeded.\n",
746                                   fsp->fsp_name, (unsigned int)newUID, (unsigned int)newGID));
747                         if (smbacl4_GetFileOwner(fsp->conn, fsp->fsp_name, &sbuf))
748                                 return map_nt_error_from_unix(errno);
749
750                         /* If we successfully chowned, we know we must
751                          * be able to set the acl, so do it as root.
752                          */
753                         set_acl_as_root = true;
754                 }
755         }
756
757         if (!(security_info_sent & DACL_SECURITY_INFORMATION) || psd->dacl ==NULL) {
758                 DEBUG(10, ("no dacl found; security_info_sent = 0x%x\n", security_info_sent));
759                 return NT_STATUS_OK;
760         }
761
762         theacl = smbacl4_win2nfs4(fsp->fsp_name, psd->dacl, &params, sbuf.st_uid, sbuf.st_gid);
763         if (!theacl)
764                 return map_nt_error_from_unix(errno);
765
766         smbacl4_dump_nfs4acl(10, theacl);
767
768         if (set_acl_as_root) {
769                 become_root();
770         }
771         result = set_nfs4_native(fsp, theacl);
772         saved_errno = errno;
773         if (set_acl_as_root) {
774                 unbecome_root();
775         }
776         if (result!=True) {
777                 errno = saved_errno;
778                 DEBUG(10, ("set_nfs4_native failed with %s\n", strerror(errno)));
779                 return map_nt_error_from_unix(errno);
780         }
781
782         DEBUG(10, ("smb_set_nt_acl_nfs4 succeeded\n"));
783         return NT_STATUS_OK;
784 }