1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
25 */
26
27 #include <sys/sunddi.h>
28 #include <sys/nbmlock.h>
29
30 #include <smbsrv/smb_kproto.h>
31 #include <smbsrv/smb_fsops.h>
32 #include <smbsrv/smbinfo.h>
33
34 static int smb_delete_check_path(smb_request_t *);
35 static int smb_delete_single_file(smb_request_t *, smb_error_t *);
36 static int smb_delete_multiple_files(smb_request_t *, smb_error_t *);
37 static int smb_delete_find_fname(smb_request_t *, smb_odir_t *, char *, int);
38 static int smb_delete_check_dosattr(smb_request_t *, smb_error_t *);
39 static int smb_delete_remove_file(smb_request_t *, smb_error_t *);
40
41 static void smb_delete_error(smb_error_t *, uint32_t, uint16_t, uint16_t);
42
43 /*
44 * smb_com_delete
45 *
46 * The delete file message is sent to delete a data file. The appropriate
47 * Tid and additional pathname are passed. Read only files may not be
48 * deleted, the read-only attribute must be reset prior to file deletion.
49 *
50 * NT supports a hidden permission known as File Delete Child (FDC). If
51 * the user has FullControl access to a directory, the user is permitted
52 * to delete any object in the directory regardless of the permissions
53 * on the object.
54 *
55 * Client Request Description
56 * ================================== =================================
57 * UCHAR WordCount; Count of parameter words = 1
58 * USHORT SearchAttributes;
59 * USHORT ByteCount; Count of data bytes; min = 2
60 * UCHAR BufferFormat; 0x04
61 * STRING FileName[]; File name
62 *
63 * Multiple files may be deleted in response to a single request as
64 * SMB_COM_DELETE supports wildcards
65 *
66 * SearchAttributes indicates the attributes that the target file(s) must
67 * have. If the attribute is zero then only normal files are deleted. If
68 * the system file or hidden attributes are specified then the delete is
69 * inclusive -both the specified type(s) of files and normal files are
70 * deleted. Attributes are described in the "Attribute Encoding" section
71 * of this document.
72 *
73 * If bit0 of the Flags2 field of the SMB header is set, a pattern is
74 * passed in, and the file has a long name, then the passed pattern much
75 * match the long file name for the delete to succeed. If bit0 is clear, a
76 * pattern is passed in, and the file has a long name, then the passed
77 * pattern must match the file's short name for the deletion to succeed.
78 *
79 * Server Response Description
80 * ================================== =================================
81 * UCHAR WordCount; Count of parameter words = 0
82 * USHORT ByteCount; Count of data bytes = 0
83 *
84 * 4.2.10.1 Errors
85 *
86 * ERRDOS/ERRbadpath
87 * ERRDOS/ERRbadfile
88 * ERRDOS/ERRnoaccess
89 * ERRDOS/ERRbadshare # returned by NT for files that are already open
90 * ERRHRD/ERRnowrite
91 * ERRSRV/ERRaccess
92 * ERRSRV/ERRinvdevice
93 * ERRSRV/ERRinvid
94 * ERRSRV/ERRbaduid
95 */
96 smb_sdrc_t
97 smb_pre_delete(smb_request_t *sr)
98 {
99 int rc;
100 smb_fqi_t *fqi;
101
102 fqi = &sr->arg.dirop.fqi;
103
104 if ((rc = smbsr_decode_vwv(sr, "w", &fqi->fq_sattr)) == 0)
105 rc = smbsr_decode_data(sr, "%S", sr, &fqi->fq_path.pn_path);
106
107 DTRACE_SMB_1(op__Delete__start, smb_request_t *, sr); /* arg.dirop */
108
109 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
110 }
111
112 void
113 smb_post_delete(smb_request_t *sr)
114 {
115 DTRACE_SMB_1(op__Delete__done, smb_request_t *, sr);
116 }
117
118 /*
119 * smb_com_delete
120 *
121 * 1. intialize, pre-process and validate pathname
122 *
123 * 2. process the path to get directory node & last_comp,
124 * store these in fqi
125 * - If smb_pathname_reduce cannot find the specified path,
126 * the error (ENOTDIR) is translated to NT_STATUS_OBJECT_PATH_NOT_FOUND
127 * if the target is a single file (no wildcards). If there are
128 * wildcards in the last_comp, NT_STATUS_OBJECT_NAME_NOT_FOUND is
129 * used instead.
130 * - If the directory node is the mount point and the last component
131 * is ".." NT_STATUS_OBJECT_PATH_SYNTAX_BAD is returned.
132 *
133 * 3. check access permissions
134 *
135 * 4. invoke the appropriate deletion routine to find and remove
136 * the specified file(s).
137 * - if target is a single file (no wildcards) - smb_delete_single_file
138 * - if the target contains wildcards - smb_delete_multiple_files
139 *
140 * Returns: SDRC_SUCCESS or SDRC_ERROR
141 */
142 smb_sdrc_t
143 smb_com_delete(smb_request_t *sr)
144 {
145 int rc;
146 smb_error_t err;
147 uint32_t status;
148 boolean_t wildcards = B_FALSE;
149 smb_fqi_t *fqi;
150 smb_pathname_t *pn;
151
152 fqi = &sr->arg.dirop.fqi;
153 pn = &fqi->fq_path;
154
155 smb_pathname_init(sr, pn, pn->pn_path);
156 if (!smb_pathname_validate(sr, pn))
157 return (SDRC_ERROR);
158 if (smb_delete_check_path(sr) != 0)
159 return (SDRC_ERROR);
160
161 wildcards = smb_contains_wildcards(pn->pn_fname);
162
163 rc = smb_pathname_reduce(sr, sr->user_cr, fqi->fq_path.pn_path,
164 sr->tid_tree->t_snode, sr->tid_tree->t_snode,
165 &fqi->fq_dnode, fqi->fq_last_comp);
166 if (rc == 0) {
167 if (!smb_node_is_dir(fqi->fq_dnode)) {
168 smb_node_release(fqi->fq_dnode);
169 rc = ENOTDIR;
170 }
171 }
172 if (rc != 0) {
173 if (rc == ENOTDIR) {
174 if (wildcards)
175 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
176 else
177 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
178 smbsr_error(sr, status, ERRDOS, ERROR_FILE_NOT_FOUND);
179 } else {
180 smbsr_errno(sr, rc);
181 }
182
183 return (SDRC_ERROR);
184 }
185
186 if ((fqi->fq_dnode == sr->tid_tree->t_snode) &&
187 (strcmp(fqi->fq_last_comp, "..") == 0)) {
188 smb_node_release(fqi->fq_dnode);
189 smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD,
190 ERRDOS, ERROR_BAD_PATHNAME);
191 return (SDRC_ERROR);
192 }
193
194 rc = smb_fsop_access(sr, sr->user_cr, fqi->fq_dnode,
195 FILE_LIST_DIRECTORY);
196 if (rc != 0) {
197 smb_node_release(fqi->fq_dnode);
198 smbsr_error(sr, NT_STATUS_ACCESS_DENIED,
199 ERRDOS, ERROR_ACCESS_DENIED);
200 return (SDRC_ERROR);
201 }
202
203 if (wildcards)
204 rc = smb_delete_multiple_files(sr, &err);
205 else
206 rc = smb_delete_single_file(sr, &err);
207
208 smb_node_release(fqi->fq_dnode);
209
210 if (rc != 0)
211 smbsr_set_error(sr, &err);
212 else
213 rc = smbsr_encode_empty_result(sr);
214
215 return (rc == 0 ? SDRC_SUCCESS : SDRC_ERROR);
216 }
217
218 /*
219 * smb_delete_single_file
220 *
221 * Find the specified file and, if its attributes match the search
222 * criteria, delete it.
223 *
224 * Returns 0 - success (file deleted)
225 * -1 - error, err is populated with error details
226 */
227 static int
228 smb_delete_single_file(smb_request_t *sr, smb_error_t *err)
229 {
230 smb_fqi_t *fqi;
231 smb_pathname_t *pn;
232
233 fqi = &sr->arg.dirop.fqi;
234 pn = &fqi->fq_path;
235
236 /* pn already initialized and validated */
237 if (!smb_validate_object_name(sr, pn)) {
238 smb_delete_error(err, sr->smb_error.status,
239 ERRDOS, ERROR_INVALID_NAME);
240 return (-1);
241 }
242
243 if (smb_fsop_lookup_name(sr, sr->user_cr, 0, sr->tid_tree->t_snode,
244 fqi->fq_dnode, fqi->fq_last_comp, &fqi->fq_fnode) != 0) {
245 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND,
246 ERRDOS, ERROR_FILE_NOT_FOUND);
247 return (-1);
248 }
249
250 if (smb_delete_check_dosattr(sr, err) != 0) {
251 smb_node_release(fqi->fq_fnode);
252 return (-1);
253 }
254
255 if (smb_delete_remove_file(sr, err) != 0) {
256 smb_node_release(fqi->fq_fnode);
257 return (-1);
258 }
259
260 smb_node_release(fqi->fq_fnode);
261 return (0);
262 }
263
264 /*
265 * smb_delete_multiple_files
266 *
267 * For each matching file found by smb_delete_find_fname:
268 * 1. lookup file
269 * 2. check the file's attributes
270 * - The search ends with an error if a readonly file
271 * (NT_STATUS_CANNOT_DELETE) is matched.
272 * - The search ends (but not an error) if a directory is
273 * matched and the request's search did not include
274 * directories.
275 * - Otherwise, if smb_delete_check_dosattr fails the file
276 * is skipped and the search continues (at step 1)
277 * 3. delete the file
278 *
279 * Returns 0 - success
280 * -1 - error, err is populated with error details
281 */
282 static int
283 smb_delete_multiple_files(smb_request_t *sr, smb_error_t *err)
284 {
285 char namebuf[MAXNAMELEN];
286 smb_fqi_t *fqi;
287 smb_odir_t *od;
288 uint32_t status;
289 int rc, deleted = 0;
290
291 fqi = &sr->arg.dirop.fqi;
292
293 /*
294 * Specify all search attributes (SMB_SEARCH_ATTRIBUTES) so that
295 * delete-specific checking can be done (smb_delete_check_dosattr).
296 */
297 status = smb_odir_openpath(sr, fqi->fq_path.pn_path,
298 SMB_SEARCH_ATTRIBUTES, 0, &od);
299 if (status != 0) {
300 err->status = status;
301 return (-1);
302 }
303
304 for (;;) {
305 rc = smb_delete_find_fname(sr, od, namebuf, MAXNAMELEN);
306 if (rc != 0)
307 break;
308
309 rc = smb_fsop_lookup_name(sr, sr->user_cr, SMB_CASE_SENSITIVE,
310 sr->tid_tree->t_snode, fqi->fq_dnode,
311 namebuf, &fqi->fq_fnode);
312 if (rc != 0)
313 break;
314
315 if (smb_delete_check_dosattr(sr, err) != 0) {
316 smb_node_release(fqi->fq_fnode);
317 if (err->status == NT_STATUS_CANNOT_DELETE) {
318 smb_odir_close(od);
319 smb_odir_release(od);
320 return (-1);
321 }
322 if ((err->status == NT_STATUS_FILE_IS_A_DIRECTORY) &&
323 (SMB_SEARCH_DIRECTORY(fqi->fq_sattr) != 0))
324 break;
325 continue;
326 }
327
328 if (smb_delete_remove_file(sr, err) == 0) {
329 ++deleted;
330 smb_node_release(fqi->fq_fnode);
331 continue;
332 }
333 if (err->status == NT_STATUS_OBJECT_NAME_NOT_FOUND) {
334 smb_node_release(fqi->fq_fnode);
335 continue;
336 }
337
338 smb_odir_close(od);
339 smb_odir_release(od);
340 smb_node_release(fqi->fq_fnode);
341 return (-1);
342 }
343
344 smb_odir_close(od);
345 smb_odir_release(od);
346
347 if ((rc != 0) && (rc != ENOENT)) {
348 smbsr_map_errno(rc, err);
349 return (-1);
350 }
351
352 if (deleted == 0) {
353 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE,
354 ERRDOS, ERROR_FILE_NOT_FOUND);
355 return (-1);
356 }
357
358 return (0);
359 }
360
361 /*
362 * smb_delete_find_fname
363 *
364 * Find next filename that matches search pattern and return it
365 * in namebuf.
366 *
367 * Returns: 0 - success
368 * errno
369 */
370 static int
371 smb_delete_find_fname(smb_request_t *sr, smb_odir_t *od, char *namebuf, int len)
372 {
373 int rc;
374 smb_odirent_t *odirent;
375 boolean_t eos;
376
377 odirent = kmem_alloc(sizeof (smb_odirent_t), KM_SLEEP);
378
379 rc = smb_odir_read(sr, od, odirent, &eos);
380 if (rc == 0) {
381 (void) strlcpy(namebuf, odirent->od_name, len);
382 }
383 kmem_free(odirent, sizeof (smb_odirent_t));
384 return (rc);
385 }
386
387 /*
388 * smb_delete_check_dosattr
389 *
390 * Check file's dos atributes to ensure that
391 * 1. the file is not a directory - NT_STATUS_FILE_IS_A_DIRECTORY
392 * 2. the file is not readonly - NT_STATUS_CANNOT_DELETE
393 * 3. the file's dos attributes comply with the specified search attributes
394 * If the file is either hidden or system and those attributes
395 * are not specified in the search attributes - NT_STATUS_NO_SUCH_FILE
396 *
397 * Returns: 0 - file's attributes pass all checks
398 * -1 - err populated with error details
399 */
400 static int
401 smb_delete_check_dosattr(smb_request_t *sr, smb_error_t *err)
402 {
403 smb_fqi_t *fqi;
404 smb_node_t *node;
405 smb_attr_t attr;
406 uint16_t sattr;
407
408 fqi = &sr->arg.dirop.fqi;
409 sattr = fqi->fq_sattr;
410 node = fqi->fq_fnode;
411
412 bzero(&attr, sizeof (attr));
413 attr.sa_mask = SMB_AT_DOSATTR;
414 if (smb_node_getattr(sr, node, zone_kcred(), NULL, &attr) != 0) {
415 smb_delete_error(err, NT_STATUS_INTERNAL_ERROR,
416 ERRDOS, ERROR_INTERNAL_ERROR);
417 return (-1);
418 }
419
420 if (attr.sa_dosattr & FILE_ATTRIBUTE_DIRECTORY) {
421 smb_delete_error(err, NT_STATUS_FILE_IS_A_DIRECTORY,
422 ERRDOS, ERROR_ACCESS_DENIED);
423 return (-1);
424 }
425
426 if (SMB_PATHFILE_IS_READONLY(sr, node)) {
427 smb_delete_error(err, NT_STATUS_CANNOT_DELETE,
428 ERRDOS, ERROR_ACCESS_DENIED);
429 return (-1);
430 }
431
432 if ((attr.sa_dosattr & FILE_ATTRIBUTE_HIDDEN) &&
433 !(SMB_SEARCH_HIDDEN(sattr))) {
434 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE,
435 ERRDOS, ERROR_FILE_NOT_FOUND);
436 return (-1);
437 }
438
439 if ((attr.sa_dosattr & FILE_ATTRIBUTE_SYSTEM) &&
440 !(SMB_SEARCH_SYSTEM(sattr))) {
441 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE,
442 ERRDOS, ERROR_FILE_NOT_FOUND);
443 return (-1);
444 }
445
446 return (0);
447 }
448
449 /*
450 * smb_delete_remove_file
451 *
452 * For consistency with Windows 2000, the range check should be done
453 * after checking for sharing violations. Attempting to delete a
454 * locked file will result in sharing violation, which is the same
455 * thing that will happen if you try to delete a non-locked open file.
456 *
457 * Note that windows 2000 rejects lock requests on open files that
458 * have been opened with metadata open modes. The error is
459 * STATUS_ACCESS_DENIED.
460 *
461 * NT does not always close a file immediately, which can cause the
462 * share and access checking to fail (the node refcnt is greater
463 * than one), and the file doesn't get deleted. Breaking the oplock
464 * before share and lock checking gives the client a chance to
465 * close the file.
466 *
467 * Returns: 0 - success
468 * -1 - error, err populated with error details
469 */
470 static int
471 smb_delete_remove_file(smb_request_t *sr, smb_error_t *err)
472 {
473 int rc, count;
474 uint32_t status;
475 smb_fqi_t *fqi;
476 smb_node_t *node;
477 uint32_t flags = 0;
478
479 fqi = &sr->arg.dirop.fqi;
480 node = fqi->fq_fnode;
481
482 /*
483 * Break BATCH oplock before ofile checks. If a client
484 * has a file open, this will force a flush or close,
485 * which may affect the outcome of any share checking.
486 */
487 (void) smb_oplock_break(sr, node,
488 SMB_OPLOCK_BREAK_TO_LEVEL_II | SMB_OPLOCK_BREAK_BATCH);
489
490 /*
491 * Wait (a little) for the oplock break to be
492 * responded to by clients closing handles.
493 * Hold node->n_lock as reader to keep new
494 * ofiles from showing up after we check.
495 */
496 smb_node_rdlock(node);
497 for (count = 0; count <= 12; count++) {
498 status = smb_node_delete_check(node);
499 if (status != NT_STATUS_SHARING_VIOLATION)
500 break;
501 smb_node_unlock(node);
502 delay(MSEC_TO_TICK(100));
503 smb_node_rdlock(node);
504 }
505 if (status != NT_STATUS_SUCCESS) {
506 smb_delete_error(err, NT_STATUS_SHARING_VIOLATION,
507 ERRDOS, ERROR_SHARING_VIOLATION);
508 smb_node_unlock(node);
509 return (-1);
510 }
511
512 /*
513 * Note, the combination of these two:
514 * smb_node_rdlock(node);
515 * nbl_start_crit(node->vp, RW_READER);
516 * is equivalent to this call:
517 * smb_node_start_crit(node, RW_READER)
518 *
519 * Cleanup after this point should use:
520 * smb_node_end_crit(node)
521 */
522 nbl_start_crit(node->vp, RW_READER);
523
524 /*
525 * This checks nbl_share_conflict, nbl_lock_conflict
526 */
527 status = smb_nbl_conflict(node, 0, UINT64_MAX, NBL_REMOVE);
528 if (status == NT_STATUS_SHARING_VIOLATION) {
529 smb_node_end_crit(node);
530 smb_delete_error(err, NT_STATUS_SHARING_VIOLATION,
531 ERRDOS, ERROR_SHARING_VIOLATION);
532 return (-1);
533 }
534 if (status != NT_STATUS_SUCCESS) {
535 smb_node_end_crit(node);
536 smb_delete_error(err, NT_STATUS_ACCESS_DENIED,
537 ERRDOS, ERROR_ACCESS_DENIED);
538 return (-1);
539 }
540
541 if (SMB_TREE_SUPPORTS_CATIA(sr))
542 flags |= SMB_CATIA;
543
544 rc = smb_fsop_remove(sr, sr->user_cr, node->n_dnode,
545 node->od_name, flags);
546 if (rc != 0) {
547 if (rc == ENOENT)
548 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND,
549 ERRDOS, ERROR_FILE_NOT_FOUND);
550 else
551 smbsr_map_errno(rc, err);
552
553 smb_node_end_crit(node);
554 return (-1);
555 }
556
557 smb_node_end_crit(node);
558 return (0);
559 }
560
561
562 /*
563 * smb_delete_check_path
564 *
565 * smb_pathname_validate() should already have been used to
566 * perform initial validation on the pathname. Additional
567 * request specific validation of the filename is performed
568 * here.
569 *
570 * - pn->pn_fname is NULL should result in NT_STATUS_FILE_IS_A_DIRECTORY
571 *
572 * - Any wildcard filename that resolves to '.' should result in
573 * NT_STATUS_OBJECT_NAME_INVALID if the search attributes include
574 * FILE_ATTRIBUTE_DIRECTORY
575 *
576 * Returns:
577 * 0: path is valid.
578 * -1: path is invalid. Sets error information in sr.
579 */
580 static int
581 smb_delete_check_path(smb_request_t *sr)
582 {
583 smb_fqi_t *fqi = &sr->arg.dirop.fqi;
584 smb_pathname_t *pn = &fqi->fq_path;
585
586 if (pn->pn_fname == NULL) {
587 smbsr_error(sr, NT_STATUS_FILE_IS_A_DIRECTORY,
588 ERRDOS, ERROR_ACCESS_DENIED);
589 return (-1);
590 }
591
592 /* fname component is, or resolves to, '.' (dot) */
593 if ((strcmp(pn->pn_fname, ".") == 0) ||
594 (SMB_SEARCH_DIRECTORY(fqi->fq_sattr) &&
595 (smb_match(pn->pn_fname, ".", B_FALSE)))) {
596 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID,
597 ERRDOS, ERROR_INVALID_NAME);
598 return (-1);
599 }
600
601 return (0);
602 }
603
604 /*
605 * smb_delete_error
606 */
607 static void
608 smb_delete_error(smb_error_t *err,
609 uint32_t status, uint16_t errcls, uint16_t errcode)
610 {
611 err->status = status;
612 err->errcls = errcls;
613 err->errcode = errcode;
614 }