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s3:net_idmap_dump add missing braces
[Samba/gebeck_regimport.git] / source3 / modules / vfs_acl_common.c
blob4e3aa72d378194a8595ce7d1cd904d038dd5e7db
1 /*
2 * Store Windows ACLs in data store - common functions.
3 * #included into modules/vfs_acl_xattr.c and modules/vfs_acl_tdb.c
4 *
5 * Copyright (C) Volker Lendecke, 2008
6 * Copyright (C) Jeremy Allison, 2009
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "smbd/smbd.h"
23 #include "system/filesys.h"
24 #include "../libcli/security/security.h"
25 #include "../librpc/gen_ndr/ndr_security.h"
26 #include "../lib/util/bitmap.h"
27
28 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
29 DATA_BLOB *pblob,
30 uint16_t hash_type,
31 uint8_t hash[XATTR_SD_HASH_SIZE]);
32
33 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
34 vfs_handle_struct *handle,
35 files_struct *fsp,
36 const char *name,
37 DATA_BLOB *pblob);
38
39 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
40 files_struct *fsp,
41 DATA_BLOB *pblob);
42
43 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
44 SECINFO_GROUP | \
45 SECINFO_DACL | \
46 SECINFO_SACL)
47
48 /*******************************************************************
49 Hash a security descriptor.
50 *******************************************************************/
51
52 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
53 uint8_t *hash)
54 {
55 DATA_BLOB blob;
56 SHA256_CTX tctx;
57 NTSTATUS status;
58
59 memset(hash, '\0', XATTR_SD_HASH_SIZE);
60 status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
61 if (!NT_STATUS_IS_OK(status)) {
62 return status;
63 }
64
65 samba_SHA256_Init(&tctx);
66 samba_SHA256_Update(&tctx, blob.data, blob.length);
67 samba_SHA256_Final(hash, &tctx);
68
69 return NT_STATUS_OK;
70 }
71
72 /*******************************************************************
73 Parse out a struct security_descriptor from a DATA_BLOB.
74 *******************************************************************/
75
76 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
77 TALLOC_CTX *mem_ctx,
78 struct security_descriptor **ppdesc,
79 uint16_t *p_hash_type,
80 uint8_t hash[XATTR_SD_HASH_SIZE])
81 {
82 struct xattr_NTACL xacl;
83 enum ndr_err_code ndr_err;
84 size_t sd_size;
85 TALLOC_CTX *frame = talloc_stackframe();
86
87 ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
88 (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
89
90 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
91 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
92 ndr_errstr(ndr_err)));
93 TALLOC_FREE(frame);
94 return ndr_map_error2ntstatus(ndr_err);
95 }
96
97 switch (xacl.version) {
98 case 1:
99 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
100 xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
101 xacl.info.sd->owner_sid,
102 xacl.info.sd->group_sid,
103 xacl.info.sd->sacl,
104 xacl.info.sd->dacl,
105 &sd_size);
106 /* No hash - null out. */
107 *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
108 memset(hash, '\0', XATTR_SD_HASH_SIZE);
109 break;
110 case 2:
111 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
112 xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
113 xacl.info.sd_hs2->sd->owner_sid,
114 xacl.info.sd_hs2->sd->group_sid,
115 xacl.info.sd_hs2->sd->sacl,
116 xacl.info.sd_hs2->sd->dacl,
117 &sd_size);
118 /* No hash - null out. */
119 *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
120 memset(hash, '\0', XATTR_SD_HASH_SIZE);
121 break;
122 case 3:
123 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
124 xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
125 xacl.info.sd_hs3->sd->owner_sid,
126 xacl.info.sd_hs3->sd->group_sid,
127 xacl.info.sd_hs3->sd->sacl,
128 xacl.info.sd_hs3->sd->dacl,
129 &sd_size);
130 *p_hash_type = xacl.info.sd_hs3->hash_type;
131 /* Current version 3. */
132 memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
133 break;
134 default:
135 TALLOC_FREE(frame);
136 return NT_STATUS_REVISION_MISMATCH;
137 }
138
139 TALLOC_FREE(frame);
140
141 return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
142 }
143
144 /*******************************************************************
145 Create a DATA_BLOB from a security descriptor.
146 *******************************************************************/
147
148 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
149 DATA_BLOB *pblob,
150 uint16_t hash_type,
151 uint8_t hash[XATTR_SD_HASH_SIZE])
152 {
153 struct xattr_NTACL xacl;
154 struct security_descriptor_hash_v3 sd_hs3;
155 enum ndr_err_code ndr_err;
156 TALLOC_CTX *ctx = talloc_tos();
157
158 ZERO_STRUCT(xacl);
159 ZERO_STRUCT(sd_hs3);
160
161 xacl.version = 3;
162 xacl.info.sd_hs3 = &sd_hs3;
163 xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
164 xacl.info.sd_hs3->hash_type = hash_type;
165 memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
166
167 ndr_err = ndr_push_struct_blob(
168 pblob, ctx, &xacl,
169 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
170
171 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
172 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
173 ndr_errstr(ndr_err)));
174 return ndr_map_error2ntstatus(ndr_err);
175 }
176
177 return NT_STATUS_OK;
178 }
179
180 /*******************************************************************
181 Add in 3 inheritable components for a non-inheritable directory ACL.
182 CREATOR_OWNER/CREATOR_GROUP/WORLD.
183 *******************************************************************/
184
185 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
186 const char *name,
187 SMB_STRUCT_STAT *psbuf,
188 struct security_descriptor *psd)
189 {
190 struct connection_struct *conn = handle->conn;
191 int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
192 struct smb_filename smb_fname;
193 enum security_ace_type acltype;
194 uint32_t access_mask;
195 mode_t dir_mode;
196 mode_t file_mode;
197 mode_t mode;
198 struct security_ace *new_ace_list;
199
200 if (psd->dacl) {
201 new_ace_list = talloc_zero_array(psd->dacl,
202 struct security_ace,
203 num_aces + 3);
204 } else {
205 /*
206 * make_sec_acl() at the bottom of this function
207 * dupliates new_ace_list
208 */
209 new_ace_list = talloc_zero_array(talloc_tos(),
210 struct security_ace,
211 num_aces + 3);
212 }
213
214 if (new_ace_list == NULL) {
215 return NT_STATUS_NO_MEMORY;
216 }
217
218 /* Fake a quick smb_filename. */
219 ZERO_STRUCT(smb_fname);
220 smb_fname.st = *psbuf;
221 smb_fname.base_name = discard_const_p(char, name);
222
223 dir_mode = unix_mode(conn,
224 FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
225 file_mode = unix_mode(conn,
226 FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
227
228 mode = dir_mode | file_mode;
229
230 DEBUG(10, ("add_directory_inheritable_components: directory %s, "
231 "mode = 0%o\n",
232 name,
233 (unsigned int)mode ));
234
235 if (num_aces) {
236 memcpy(new_ace_list, psd->dacl->aces,
237 num_aces * sizeof(struct security_ace));
238 }
239 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
240 mode & 0700, false);
241
242 init_sec_ace(&new_ace_list[num_aces],
243 &global_sid_Creator_Owner,
244 acltype,
245 access_mask,
246 SEC_ACE_FLAG_CONTAINER_INHERIT|
247 SEC_ACE_FLAG_OBJECT_INHERIT|
248 SEC_ACE_FLAG_INHERIT_ONLY);
249 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
250 (mode << 3) & 0700, false);
251 init_sec_ace(&new_ace_list[num_aces+1],
252 &global_sid_Creator_Group,
253 acltype,
254 access_mask,
255 SEC_ACE_FLAG_CONTAINER_INHERIT|
256 SEC_ACE_FLAG_OBJECT_INHERIT|
257 SEC_ACE_FLAG_INHERIT_ONLY);
258 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
259 (mode << 6) & 0700, false);
260 init_sec_ace(&new_ace_list[num_aces+2],
261 &global_sid_World,
262 acltype,
263 access_mask,
264 SEC_ACE_FLAG_CONTAINER_INHERIT|
265 SEC_ACE_FLAG_OBJECT_INHERIT|
266 SEC_ACE_FLAG_INHERIT_ONLY);
267 if (psd->dacl) {
268 psd->dacl->aces = new_ace_list;
269 psd->dacl->num_aces += 3;
270 } else {
271 psd->dacl = make_sec_acl(psd,
272 NT4_ACL_REVISION,
273 3,
274 new_ace_list);
275 if (psd->dacl == NULL) {
276 return NT_STATUS_NO_MEMORY;
277 }
278 }
279 return NT_STATUS_OK;
280 }
281
282 /*******************************************************************
283 Pull a DATA_BLOB from an xattr given a pathname.
284 If the hash doesn't match, or doesn't exist - return the underlying
285 filesystem sd.
286 *******************************************************************/
287
288 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
289 files_struct *fsp,
290 const char *name,
291 uint32_t security_info,
292 TALLOC_CTX *mem_ctx,
293 struct security_descriptor **ppdesc)
294 {
295 DATA_BLOB blob = data_blob_null;
296 NTSTATUS status;
297 uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
298 uint8_t hash[XATTR_SD_HASH_SIZE];
299 uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
300 struct security_descriptor *psd = NULL;
301 struct security_descriptor *pdesc_next = NULL;
302 bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
303 ACL_MODULE_NAME,
304 "ignore system acls",
305 false);
306
307 if (fsp && name == NULL) {
308 name = fsp->fsp_name->base_name;
309 }
310
311 DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
312
313 /* Get the full underlying sd for the hash
314 or to return as backup. */
315 if (fsp) {
316 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
317 fsp,
318 HASH_SECURITY_INFO,
319 mem_ctx,
320 &pdesc_next);
321 } else {
322 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
323 name,
324 HASH_SECURITY_INFO,
325 mem_ctx,
326 &pdesc_next);
327 }
328
329 if (!NT_STATUS_IS_OK(status)) {
330 DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
331 "returned %s\n",
332 name,
333 nt_errstr(status)));
334 return status;
335 }
336
337 status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
338 if (!NT_STATUS_IS_OK(status)) {
339 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
340 nt_errstr(status)));
341 psd = pdesc_next;
342 goto out;
343 }
344
345 status = parse_acl_blob(&blob, mem_ctx, &psd,
346 &hash_type, &hash[0]);
347 if (!NT_STATUS_IS_OK(status)) {
348 DEBUG(10, ("parse_acl_blob returned %s\n",
349 nt_errstr(status)));
350 psd = pdesc_next;
351 goto out;
352 }
353
354 /* Ensure the hash type is one we know. */
355 switch (hash_type) {
356 case XATTR_SD_HASH_TYPE_NONE:
357 /* No hash, just return blob sd. */
358 goto out;
359 case XATTR_SD_HASH_TYPE_SHA256:
360 break;
361 default:
362 DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
363 "mismatch (%u) for file %s\n",
364 (unsigned int)hash_type,
365 name));
366 TALLOC_FREE(psd);
367 psd = pdesc_next;
368 goto out;
369 }
370
371 if (ignore_file_system_acl) {
372 goto out;
373 }
374
375 status = hash_sd_sha256(pdesc_next, hash_tmp);
376 if (!NT_STATUS_IS_OK(status)) {
377 TALLOC_FREE(psd);
378 psd = pdesc_next;
379 goto out;
380 }
381
382 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
383 /* Hash matches, return blob sd. */
384 DEBUG(10, ("get_nt_acl_internal: blob hash "
385 "matches for file %s\n",
386 name ));
387 goto out;
388 }
389
390 /* Hash doesn't match, return underlying sd. */
391 DEBUG(10, ("get_nt_acl_internal: blob hash "
392 "does not match for file %s - returning "
393 "file system SD mapping.\n",
394 name ));
395
396 if (DEBUGLEVEL >= 10) {
397 DEBUG(10,("get_nt_acl_internal: acl for blob hash for %s is:\n",
398 name ));
399 NDR_PRINT_DEBUG(security_descriptor, pdesc_next);
400 }
401
402 TALLOC_FREE(psd);
403 psd = pdesc_next;
404
405 out:
406
407 if (psd != pdesc_next) {
408 /* We're returning the blob, throw
409 * away the filesystem SD. */
410 TALLOC_FREE(pdesc_next);
411 } else {
412 SMB_STRUCT_STAT sbuf;
413 SMB_STRUCT_STAT *psbuf = &sbuf;
414 bool is_directory = false;
415 /*
416 * We're returning the underlying ACL from the
417 * filesystem. If it's a directory, and has no
418 * inheritable ACE entries we have to fake them.
419 */
420 if (fsp) {
421 status = vfs_stat_fsp(fsp);
422 if (!NT_STATUS_IS_OK(status)) {
423 return status;
424 }
425 psbuf = &fsp->fsp_name->st;
426 } else {
427 int ret = vfs_stat_smb_fname(handle->conn,
428 name,
429 &sbuf);
430 if (ret == -1) {
431 return map_nt_error_from_unix(errno);
432 }
433 }
434 is_directory = S_ISDIR(psbuf->st_ex_mode);
435
436 if (ignore_file_system_acl) {
437 TALLOC_FREE(pdesc_next);
438 status = make_default_filesystem_acl(mem_ctx,
439 name,
440 psbuf,
441 &psd);
442 if (!NT_STATUS_IS_OK(status)) {
443 return status;
444 }
445 } else {
446 if (is_directory &&
447 !sd_has_inheritable_components(psd,
448 true)) {
449 status = add_directory_inheritable_components(
450 handle,
451 name,
452 psbuf,
453 psd);
454 if (!NT_STATUS_IS_OK(status)) {
455 return status;
456 }
457 }
458 /* The underlying POSIX module always sets
459 the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
460 can't be inherited in this way under POSIX.
461 Remove it for Windows-style ACLs. */
462 psd->type &= ~SEC_DESC_DACL_PROTECTED;
463 }
464 }
465
466 if (!(security_info & SECINFO_OWNER)) {
467 psd->owner_sid = NULL;
468 }
469 if (!(security_info & SECINFO_GROUP)) {
470 psd->group_sid = NULL;
471 }
472 if (!(security_info & SECINFO_DACL)) {
473 psd->type &= ~SEC_DESC_DACL_PRESENT;
474 psd->dacl = NULL;
475 }
476 if (!(security_info & SECINFO_SACL)) {
477 psd->type &= ~SEC_DESC_SACL_PRESENT;
478 psd->sacl = NULL;
479 }
480
481 TALLOC_FREE(blob.data);
482 *ppdesc = psd;
483
484 if (DEBUGLEVEL >= 10) {
485 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
486 name ));
487 NDR_PRINT_DEBUG(security_descriptor, psd);
488 }
489
490 return NT_STATUS_OK;
491 }
492
493 /*********************************************************************
494 Fetch a security descriptor given an fsp.
495 *********************************************************************/
496
497 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
498 files_struct *fsp,
499 uint32_t security_info,
500 TALLOC_CTX *mem_ctx,
501 struct security_descriptor **ppdesc)
502 {
503 return get_nt_acl_internal(handle, fsp,
504 NULL, security_info, mem_ctx, ppdesc);
505 }
506
507 /*********************************************************************
508 Fetch a security descriptor given a pathname.
509 *********************************************************************/
510
511 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
512 const char *name,
513 uint32_t security_info,
514 TALLOC_CTX *mem_ctx,
515 struct security_descriptor **ppdesc)
516 {
517 return get_nt_acl_internal(handle, NULL,
518 name, security_info, mem_ctx, ppdesc);
519 }
520
521 /*********************************************************************
522 Store a security descriptor given an fsp.
523 *********************************************************************/
524
525 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
526 uint32_t security_info_sent, const struct security_descriptor *orig_psd)
527 {
528 NTSTATUS status;
529 DATA_BLOB blob;
530 struct security_descriptor *pdesc_next = NULL;
531 struct security_descriptor *psd = NULL;
532 uint8_t hash[XATTR_SD_HASH_SIZE];
533 bool chown_needed = false;
534 TALLOC_CTX *frame = talloc_stackframe();
535
536 if (DEBUGLEVEL >= 10) {
537 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
538 fsp_str_dbg(fsp)));
539 NDR_PRINT_DEBUG(security_descriptor,
540 discard_const_p(struct security_descriptor, orig_psd));
541 }
542
543 status = get_nt_acl_internal(handle, fsp,
544 NULL,
545 SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
546 frame,
547 &psd);
548
549 if (!NT_STATUS_IS_OK(status)) {
550 TALLOC_FREE(frame);
551 return status;
552 }
553
554 psd->revision = orig_psd->revision;
555 /* All our SD's are self relative. */
556 psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
557
558 if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
559 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
560 /* We're changing the owner. */
561 chown_needed = true;
562 }
563 psd->owner_sid = orig_psd->owner_sid;
564 }
565 if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
566 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
567 /* We're changing the group. */
568 chown_needed = true;
569 }
570 psd->group_sid = orig_psd->group_sid;
571 }
572 if (security_info_sent & SECINFO_DACL) {
573 psd->dacl = orig_psd->dacl;
574 psd->type |= SEC_DESC_DACL_PRESENT;
575 }
576 if (security_info_sent & SECINFO_SACL) {
577 psd->sacl = orig_psd->sacl;
578 psd->type |= SEC_DESC_SACL_PRESENT;
579 }
580
581 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
582 if (!NT_STATUS_IS_OK(status)) {
583 if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
584 TALLOC_FREE(frame);
585 return status;
586 }
587 /* We got access denied here. If we're already root,
588 or we didn't need to do a chown, or the fsp isn't
589 open with WRITE_OWNER access, just return. */
590 if (get_current_uid(handle->conn) == 0 ||
591 chown_needed == false ||
592 !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
593 TALLOC_FREE(frame);
594 return NT_STATUS_ACCESS_DENIED;
595 }
596
597 DEBUG(10,("fset_nt_acl_common: overriding chown on file %s "
598 "for sid %s\n",
599 fsp_str_dbg(fsp),
600 sid_string_tos(psd->owner_sid)
601 ));
602
603 /* Ok, we failed to chown and we have
604 SEC_STD_WRITE_OWNER access - override. */
605 become_root();
606 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
607 security_info_sent, psd);
608 unbecome_root();
609 if (!NT_STATUS_IS_OK(status)) {
610 TALLOC_FREE(frame);
611 return status;
612 }
613 }
614
615 /* Get the full underlying sd, then hash. */
616 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
617 fsp,
618 HASH_SECURITY_INFO,
619 frame,
620 &pdesc_next);
621
622 if (!NT_STATUS_IS_OK(status)) {
623 TALLOC_FREE(frame);
624 return status;
625 }
626
627 status = hash_sd_sha256(pdesc_next, hash);
628 if (!NT_STATUS_IS_OK(status)) {
629 TALLOC_FREE(frame);
630 return status;
631 }
632
633 if (DEBUGLEVEL >= 10) {
634 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
635 fsp_str_dbg(fsp)));
636 NDR_PRINT_DEBUG(security_descriptor,
637 discard_const_p(struct security_descriptor, psd));
638
639 DEBUG(10,("fset_nt_acl_xattr: storing has in xattr sd based on \n"));
640 NDR_PRINT_DEBUG(security_descriptor,
641 discard_const_p(struct security_descriptor, pdesc_next));
642 }
643 status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
644 if (!NT_STATUS_IS_OK(status)) {
645 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
646 TALLOC_FREE(frame);
647 return status;
648 }
649
650 status = store_acl_blob_fsp(handle, fsp, &blob);
651
652 TALLOC_FREE(frame);
653 return status;
654 }
655
656 static int acl_common_remove_object(vfs_handle_struct *handle,
657 const char *path,
658 bool is_directory)
659 {
660 connection_struct *conn = handle->conn;
661 struct file_id id;
662 files_struct *fsp = NULL;
663 int ret = 0;
664 char *parent_dir = NULL;
665 const char *final_component = NULL;
666 struct smb_filename local_fname;
667 int saved_errno = 0;
668 char *saved_dir = NULL;
669
670 saved_dir = vfs_GetWd(talloc_tos(),conn);
671 if (!saved_dir) {
672 saved_errno = errno;
673 goto out;
674 }
675
676 if (!parent_dirname(talloc_tos(), path,
677 &parent_dir, &final_component)) {
678 saved_errno = ENOMEM;
679 goto out;
680 }
681
682 DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
683 is_directory ? "directory" : "file",
684 parent_dir, final_component ));
685
686 /* cd into the parent dir to pin it. */
687 ret = vfs_ChDir(conn, parent_dir);
688 if (ret == -1) {
689 saved_errno = errno;
690 goto out;
691 }
692
693 ZERO_STRUCT(local_fname);
694 local_fname.base_name = discard_const_p(char, final_component);
695
696 /* Must use lstat here. */
697 ret = SMB_VFS_LSTAT(conn, &local_fname);
698 if (ret == -1) {
699 saved_errno = errno;
700 goto out;
701 }
702
703 /* Ensure we have this file open with DELETE access. */
704 id = vfs_file_id_from_sbuf(conn, &local_fname.st);
705 for (fsp = file_find_di_first(conn->sconn, id); fsp;
706 fsp = file_find_di_next(fsp)) {
707 if (fsp->access_mask & DELETE_ACCESS &&
708 fsp->delete_on_close) {
709 /* We did open this for delete,
710 * allow the delete as root.
711 */
712 break;
713 }
714 }
715
716 if (!fsp) {
717 DEBUG(10,("acl_common_remove_object: %s %s/%s "
718 "not an open file\n",
719 is_directory ? "directory" : "file",
720 parent_dir, final_component ));
721 saved_errno = EACCES;
722 goto out;
723 }
724
725 become_root();
726 if (is_directory) {
727 ret = SMB_VFS_NEXT_RMDIR(handle, final_component);
728 } else {
729 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
730 }
731 unbecome_root();
732
733 if (ret == -1) {
734 saved_errno = errno;
735 }
736
737 out:
738
739 TALLOC_FREE(parent_dir);
740
741 if (saved_dir) {
742 vfs_ChDir(conn, saved_dir);
743 }
744 if (saved_errno) {
745 errno = saved_errno;
746 }
747 return ret;
748 }
749
750 static int rmdir_acl_common(struct vfs_handle_struct *handle,
751 const char *path)
752 {
753 int ret;
754
755 /* Try the normal rmdir first. */
756 ret = SMB_VFS_NEXT_RMDIR(handle, path);
757 if (ret == 0) {
758 return 0;
759 }
760 if (errno == EACCES || errno == EPERM) {
761 /* Failed due to access denied,
762 see if we need to root override. */
763 return acl_common_remove_object(handle,
764 path,
765 true);
766 }
767
768 DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
769 path,
770 strerror(errno) ));
771 return -1;
772 }
773
774 static int unlink_acl_common(struct vfs_handle_struct *handle,
775 const struct smb_filename *smb_fname)
776 {
777 int ret;
778
779 /* Try the normal unlink first. */
780 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
781 if (ret == 0) {
782 return 0;
783 }
784 if (errno == EACCES || errno == EPERM) {
785 /* Failed due to access denied,
786 see if we need to root override. */
787
788 /* Don't do anything fancy for streams. */
789 if (smb_fname->stream_name) {
790 return -1;
791 }
792 return acl_common_remove_object(handle,
793 smb_fname->base_name,
794 false);
795 }
796
797 DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
798 smb_fname->base_name,
799 strerror(errno) ));
800 return -1;
801 }
802
803 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
804 const char *path, mode_t mode)
805 {
806 if (lp_posix_pathnames()) {
807 /* Only allow this on POSIX pathnames. */
808 return SMB_VFS_NEXT_CHMOD(handle, path, mode);
809 }
810 return 0;
811 }
812
813 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
814 struct files_struct *fsp, mode_t mode)
815 {
816 if (fsp->posix_open) {
817 /* Only allow this on POSIX opens. */
818 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
819 }
820 return 0;
821 }
822
823 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
824 const char *name, mode_t mode)
825 {
826 if (lp_posix_pathnames()) {
827 /* Only allow this on POSIX pathnames. */
828 return SMB_VFS_NEXT_CHMOD_ACL(handle, name, mode);
829 }
830 return 0;
831 }
832
833 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
834 struct files_struct *fsp, mode_t mode)
835 {
836 if (fsp->posix_open) {
837 /* Only allow this on POSIX opens. */
838 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
839 }
840 return 0;
841 }
reg import