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 2020 Tintri by DDN, Inc. All rights reserved.
25 */
26
27 /*
28 * This module provides the common open functionality to the various
29 * open and create SMB interface functions.
30 */
31
32 #include <sys/types.h>
33 #include <sys/cmn_err.h>
34 #include <sys/fcntl.h>
35 #include <sys/nbmlock.h>
36 #include <smbsrv/string.h>
37 #include <smbsrv/smb2_kproto.h>
38 #include <smbsrv/smb_fsops.h>
39 #include <smbsrv/smbinfo.h>
40
41 int smb_session_ofile_max = 32768;
42
43 extern uint32_t smb_is_executable(char *);
44 static void smb_delete_new_object(smb_request_t *);
45 static int smb_set_open_attributes(smb_request_t *, smb_ofile_t *);
46
47 /*
48 * smb_access_generic_to_file
49 *
50 * Search MSDN for IoCreateFile to see following mapping.
51 *
52 * GENERIC_READ STANDARD_RIGHTS_READ, FILE_READ_DATA,
53 * FILE_READ_ATTRIBUTES and FILE_READ_EA
54 *
55 * GENERIC_WRITE STANDARD_RIGHTS_WRITE, FILE_WRITE_DATA,
56 * FILE_WRITE_ATTRIBUTES, FILE_WRITE_EA, and FILE_APPEND_DATA
57 *
58 * GENERIC_EXECUTE STANDARD_RIGHTS_EXECUTE, SYNCHRONIZE, and FILE_EXECUTE.
59 */
60 static uint32_t
smb_access_generic_to_file(uint32_t desired_access)61 smb_access_generic_to_file(uint32_t desired_access)
62 {
63 uint32_t access = 0;
64
65 if (desired_access & GENERIC_ALL)
66 return (FILE_ALL_ACCESS & ~SYNCHRONIZE);
67
68 if (desired_access & GENERIC_EXECUTE) {
69 desired_access &= ~GENERIC_EXECUTE;
70 access |= (STANDARD_RIGHTS_EXECUTE |
71 SYNCHRONIZE | FILE_EXECUTE);
72 }
73
74 if (desired_access & GENERIC_WRITE) {
75 desired_access &= ~GENERIC_WRITE;
76 access |= (FILE_GENERIC_WRITE & ~SYNCHRONIZE);
77 }
78
79 if (desired_access & GENERIC_READ) {
80 desired_access &= ~GENERIC_READ;
81 access |= FILE_GENERIC_READ;
82 }
83
84 return (access | desired_access);
85 }
86
87 /*
88 * smb_omode_to_amask
89 *
90 * This function converts open modes used by Open and Open AndX
91 * commands to desired access bits used by NT Create AndX command.
92 */
93 uint32_t
smb_omode_to_amask(uint32_t desired_access)94 smb_omode_to_amask(uint32_t desired_access)
95 {
96 switch (desired_access & SMB_DA_ACCESS_MASK) {
97 case SMB_DA_ACCESS_READ:
98 return (FILE_GENERIC_READ);
99
100 case SMB_DA_ACCESS_WRITE:
101 return (FILE_GENERIC_WRITE);
102
103 case SMB_DA_ACCESS_READ_WRITE:
104 return (FILE_GENERIC_READ | FILE_GENERIC_WRITE);
105
106 case SMB_DA_ACCESS_EXECUTE:
107 return (FILE_GENERIC_READ | FILE_GENERIC_EXECUTE);
108
109 default:
110 return (FILE_GENERIC_ALL);
111 }
112 }
113
114 /*
115 * smb_denymode_to_sharemode
116 *
117 * This function converts deny modes used by Open and Open AndX
118 * commands to share access bits used by NT Create AndX command.
119 */
120 uint32_t
smb_denymode_to_sharemode(uint32_t desired_access,char * fname)121 smb_denymode_to_sharemode(uint32_t desired_access, char *fname)
122 {
123 switch (desired_access & SMB_DA_SHARE_MASK) {
124 case SMB_DA_SHARE_COMPATIBILITY:
125 if (smb_is_executable(fname))
126 return (FILE_SHARE_READ | FILE_SHARE_WRITE);
127
128 return (FILE_SHARE_ALL);
129
130 case SMB_DA_SHARE_EXCLUSIVE:
131 return (FILE_SHARE_NONE);
132
133 case SMB_DA_SHARE_DENY_WRITE:
134 return (FILE_SHARE_READ);
135
136 case SMB_DA_SHARE_DENY_READ:
137 return (FILE_SHARE_WRITE);
138
139 case SMB_DA_SHARE_DENY_NONE:
140 default:
141 return (FILE_SHARE_READ | FILE_SHARE_WRITE);
142 }
143 }
144
145 /*
146 * smb_ofun_to_crdisposition
147 *
148 * This function converts open function values used by Open and Open AndX
149 * commands to create disposition values used by NT Create AndX command.
150 */
151 uint32_t
smb_ofun_to_crdisposition(uint16_t ofun)152 smb_ofun_to_crdisposition(uint16_t ofun)
153 {
154 static int ofun_cr_map[3][2] =
155 {
156 { -1, FILE_CREATE },
157 { FILE_OPEN, FILE_OPEN_IF },
158 { FILE_OVERWRITE, FILE_OVERWRITE_IF }
159 };
160
161 int row = ofun & SMB_OFUN_OPEN_MASK;
162 int col = (ofun & SMB_OFUN_CREATE_MASK) >> 4;
163
164 if (row == 3)
165 return (FILE_MAXIMUM_DISPOSITION + 1);
166
167 return (ofun_cr_map[row][col]);
168 }
169
170 /*
171 * smb_common_open
172 *
173 * Notes on write-through behaviour. It looks like pre-LM0.12 versions
174 * of the protocol specify the write-through mode when a file is opened,
175 * (SmbOpen, SmbOpenAndX) so the write calls (SmbWrite, SmbWriteAndClose,
176 * SmbWriteAndUnlock) don't need to contain a write-through flag.
177 *
178 * With LM0.12, the open calls (SmbCreateAndX, SmbNtTransactCreate)
179 * don't indicate which write-through mode to use. Instead the write
180 * calls (SmbWriteAndX, SmbWriteRaw) specify the mode on a per call
181 * basis.
182 *
183 * We don't care which open call was used to get us here, we just need
184 * to ensure that the write-through mode flag is copied from the open
185 * parameters to the node. We test the omode write-through flag in all
186 * write functions.
187 *
188 * This function returns NT status codes.
189 *
190 * The following rules apply when processing a file open request:
191 *
192 * - Oplocks must be broken prior to share checking as the break may
193 * cause other clients to close the file, which would affect sharing
194 * checks.
195 *
196 * - Share checks must take place prior to access checks for correct
197 * Windows semantics and to prevent unnecessary NFS delegation recalls.
198 *
199 * - Oplocks must be acquired after open to ensure the correct
200 * synchronization with NFS delegation and FEM installation.
201 *
202 * DOS readonly bit rules
203 *
204 * 1. The creator of a readonly file can write to/modify the size of the file
205 * using the original create fid, even though the file will appear as readonly
206 * to all other fids and via a CIFS getattr call.
207 *
208 * 2. A setinfo operation (using either an open fid or a path) to set/unset
209 * readonly will be successful regardless of whether a creator of a readonly
210 * file has an open fid.
211 *
212 * 3. The DOS readonly bit affects only data and some metadata.
213 * The following metadata can be changed regardless of the readonly bit:
214 * - security descriptors
215 * - DOS attributes
216 * - timestamps
217 *
218 * In the current implementation, the file size cannot be changed (except for
219 * the exceptions in #1 and #2, above).
220 *
221 *
222 * DOS attribute rules
223 *
224 * These rules are specific to creating / opening files and directories.
225 * How the attribute value (specifically ZERO or FILE_ATTRIBUTE_NORMAL)
226 * should be interpreted may differ in other requests.
227 *
228 * - An attribute value equal to ZERO or FILE_ATTRIBUTE_NORMAL means that the
229 * file's attributes should be cleared.
230 * - If FILE_ATTRIBUTE_NORMAL is specified with any other attributes,
231 * FILE_ATTRIBUTE_NORMAL is ignored.
232 *
233 * 1. Creating a new file
234 * - The request attributes + FILE_ATTRIBUTE_ARCHIVE are applied to the file.
235 *
236 * 2. Creating a new directory
237 * - The request attributes + FILE_ATTRIBUTE_DIRECTORY are applied to the file.
238 * - FILE_ATTRIBUTE_ARCHIVE does not get set.
239 *
240 * 3. Overwriting an existing file
241 * - the request attributes are used as search attributes. If the existing
242 * file does not meet the search criteria access is denied.
243 * - otherwise, applies attributes + FILE_ATTRIBUTE_ARCHIVE.
244 *
245 * 4. Opening an existing file or directory
246 * The request attributes are ignored.
247 */
248 uint32_t
smb_common_open(smb_request_t * sr)249 smb_common_open(smb_request_t *sr)
250 {
251 smb_server_t *sv = sr->sr_server;
252 smb_tree_t *tree = sr->tid_tree;
253 smb_node_t *fnode = NULL;
254 smb_node_t *dnode = NULL;
255 smb_node_t *cur_node = NULL;
256 smb_node_t *tmp_node = NULL;
257 smb_arg_open_t *op = &sr->sr_open;
258 smb_pathname_t *pn = &op->fqi.fq_path;
259 smb_ofile_t *of = NULL;
260 smb_attr_t new_attr;
261 hrtime_t shrlock_t0;
262 int max_requested = 0;
263 uint32_t max_allowed;
264 uint32_t status = NT_STATUS_SUCCESS;
265 int is_dir;
266 int rc;
267 boolean_t is_stream = B_FALSE;
268 int lookup_flags = SMB_FOLLOW_LINKS;
269 uint32_t uniq_fid = 0;
270 uint16_t tree_fid = 0;
271 boolean_t created = B_FALSE;
272 boolean_t last_comp_found = B_FALSE;
273 boolean_t stream_found = B_FALSE;
274 boolean_t opening_incr = B_FALSE;
275 boolean_t dnode_held = B_FALSE;
276 boolean_t dnode_wlock = B_FALSE;
277 boolean_t fnode_held = B_FALSE;
278 boolean_t fnode_wlock = B_FALSE;
279 boolean_t fnode_shrlk = B_FALSE;
280 boolean_t did_open = B_FALSE;
281 boolean_t did_break_handle = B_FALSE;
282 boolean_t did_cleanup_orphans = B_FALSE;
283 char *sname = NULL;
284
285 /* Get out now if we've been cancelled. */
286 mutex_enter(&sr->sr_mutex);
287 if (sr->sr_state != SMB_REQ_STATE_ACTIVE) {
288 mutex_exit(&sr->sr_mutex);
289 return (NT_STATUS_CANCELLED);
290 }
291 mutex_exit(&sr->sr_mutex);
292
293 is_dir = (op->create_options & FILE_DIRECTORY_FILE) ? 1 : 0;
294
295 /*
296 * If the object being created or opened is a directory
297 * the Disposition parameter must be one of FILE_CREATE,
298 * FILE_OPEN, or FILE_OPEN_IF
299 */
300 if (is_dir) {
301 if ((op->create_disposition != FILE_CREATE) &&
302 (op->create_disposition != FILE_OPEN_IF) &&
303 (op->create_disposition != FILE_OPEN)) {
304 return (NT_STATUS_INVALID_PARAMETER);
305 }
306 }
307
308 if (op->desired_access & MAXIMUM_ALLOWED) {
309 max_requested = 1;
310 op->desired_access &= ~MAXIMUM_ALLOWED;
311 }
312 op->desired_access = smb_access_generic_to_file(op->desired_access);
313
314 if (sr->session->s_file_cnt >= smb_session_ofile_max) {
315 ASSERT(sr->uid_user);
316 cmn_err(CE_NOTE, "smbsrv[%s\\%s]: TOO_MANY_OPENED_FILES",
317 sr->uid_user->u_domain, sr->uid_user->u_name);
318 return (NT_STATUS_TOO_MANY_OPENED_FILES);
319 }
320
321 if (smb_idpool_alloc(&tree->t_fid_pool, &tree_fid))
322 return (NT_STATUS_TOO_MANY_OPENED_FILES);
323
324 /* This must be NULL at this point */
325 sr->fid_ofile = NULL;
326
327 op->devstate = 0;
328
329 switch (sr->tid_tree->t_res_type & STYPE_MASK) {
330 case STYPE_DISKTREE:
331 case STYPE_PRINTQ:
332 break;
333
334 case STYPE_IPC:
335 /*
336 * Security descriptors for pipes are not implemented,
337 * so just setup a reasonable access mask.
338 */
339 op->desired_access = (READ_CONTROL | SYNCHRONIZE |
340 FILE_READ_DATA | FILE_READ_ATTRIBUTES |
341 FILE_WRITE_DATA | FILE_APPEND_DATA);
342
343 /*
344 * Limit the number of open pipe instances.
345 */
346 if ((rc = smb_threshold_enter(&sv->sv_opipe_ct)) != 0) {
347 status = RPC_NT_SERVER_TOO_BUSY;
348 goto errout;
349 }
350
351 /*
352 * Most of IPC open is handled in smb_opipe_open()
353 */
354 op->create_options = 0;
355 of = smb_ofile_alloc(sr, op, NULL, SMB_FTYPE_MESG_PIPE,
356 tree_fid);
357 tree_fid = 0; // given to the ofile
358 status = smb_opipe_open(sr, of);
359 smb_threshold_exit(&sv->sv_opipe_ct);
360 if (status != NT_STATUS_SUCCESS)
361 goto errout;
362 return (NT_STATUS_SUCCESS);
363
364 default:
365 status = NT_STATUS_BAD_DEVICE_TYPE;
366 goto errout;
367 }
368
369 smb_pathname_init(sr, pn, pn->pn_path);
370 if (!smb_pathname_validate(sr, pn)) {
371 status = sr->smb_error.status;
372 goto errout;
373 }
374
375 if (strlen(pn->pn_path) >= SMB_MAXPATHLEN) {
376 status = NT_STATUS_OBJECT_PATH_INVALID;
377 goto errout;
378 }
379
380 if (is_dir) {
381 if (!smb_validate_dirname(sr, pn)) {
382 status = sr->smb_error.status;
383 goto errout;
384 }
385 } else {
386 if (!smb_validate_object_name(sr, pn)) {
387 status = sr->smb_error.status;
388 goto errout;
389 }
390 }
391
392 cur_node = op->fqi.fq_dnode ?
393 op->fqi.fq_dnode : sr->tid_tree->t_snode;
394
395 rc = smb_pathname_reduce(sr, sr->user_cr, pn->pn_path,
396 sr->tid_tree->t_snode, cur_node, &op->fqi.fq_dnode,
397 op->fqi.fq_last_comp);
398 if (rc != 0) {
399 status = smb_errno2status(rc);
400 goto errout;
401 }
402 dnode = op->fqi.fq_dnode;
403 dnode_held = B_TRUE;
404
405 /*
406 * Lock the parent dir node in case another create
407 * request to the same parent directory comes in.
408 * Drop this once either lookup succeeds, or we've
409 * created the object in this directory.
410 */
411 smb_node_wrlock(dnode);
412 dnode_wlock = B_TRUE;
413
414 /*
415 * If the access mask has only DELETE set (ignore
416 * FILE_READ_ATTRIBUTES), then assume that this
417 * is a request to delete the link (if a link)
418 * and do not follow links. Otherwise, follow
419 * the link to the target.
420 */
421 if ((op->desired_access & ~FILE_READ_ATTRIBUTES) == DELETE)
422 lookup_flags &= ~SMB_FOLLOW_LINKS;
423
424 /*
425 * Lookup *just* the file portion of the name.
426 * Returns stream name in sname, which this allocates
427 */
428 rc = smb_fsop_lookup_file(sr, zone_kcred(), lookup_flags,
429 sr->tid_tree->t_snode, op->fqi.fq_dnode, op->fqi.fq_last_comp,
430 &sname, &op->fqi.fq_fnode);
431
432 if (rc == 0) {
433 last_comp_found = B_TRUE;
434 fnode_held = B_TRUE;
435
436 /*
437 * Need the DOS attributes below, where we
438 * check the search attributes (sattr).
439 * Also UID, for owner check below.
440 */
441 op->fqi.fq_fattr.sa_mask = SMB_AT_DOSATTR | SMB_AT_UID;
442 rc = smb_node_getattr(sr, op->fqi.fq_fnode, zone_kcred(),
443 NULL, &op->fqi.fq_fattr);
444 if (rc != 0) {
445 status = NT_STATUS_INTERNAL_ERROR;
446 goto errout;
447 }
448 } else if (rc == ENOENT) {
449 last_comp_found = B_FALSE;
450 op->fqi.fq_fnode = NULL;
451 rc = 0;
452 } else {
453 status = smb_errno2status(rc);
454 goto errout;
455 }
456
457 if (last_comp_found) {
458
459 fnode = op->fqi.fq_fnode;
460 dnode = op->fqi.fq_dnode;
461
462 if (!smb_node_is_file(fnode) &&
463 !smb_node_is_dir(fnode) &&
464 !smb_node_is_symlink(fnode)) {
465 status = NT_STATUS_ACCESS_DENIED;
466 goto errout;
467 }
468
469 /*
470 * Reject this request if either:
471 * - the target IS a directory and the client requires that
472 * it must NOT be (required by Lotus Notes)
473 * - the target is NOT a directory and client requires that
474 * it MUST be.
475 * Streams are never directories.
476 */
477 if (smb_node_is_dir(fnode) && sname == NULL) {
478 if (op->create_options & FILE_NON_DIRECTORY_FILE) {
479 status = NT_STATUS_FILE_IS_A_DIRECTORY;
480 goto errout;
481 }
482 } else {
483 if ((op->create_options & FILE_DIRECTORY_FILE) ||
484 (op->nt_flags & NT_CREATE_FLAG_OPEN_TARGET_DIR)) {
485 status = NT_STATUS_NOT_A_DIRECTORY;
486 goto errout;
487 }
488 }
489
490 /* If we're given a stream name, look it up now */
491 if (sname != NULL) {
492 tmp_node = fnode;
493 rc = smb_fsop_lookup_stream(sr, zone_kcred(),
494 lookup_flags, sr->tid_tree->t_snode, fnode, sname,
495 &fnode);
496 } else {
497 rc = 0;
498 }
499
500 if (rc == 0) { /* Stream Exists (including unnamed stream) */
501 stream_found = B_TRUE;
502 smb_node_unlock(dnode);
503 dnode_wlock = B_FALSE;
504
505 if (tmp_node != NULL)
506 smb_node_release(tmp_node);
507
508 /*
509 * No more open should be accepted when
510 * "Delete on close" flag is set.
511 */
512 if (fnode->flags & NODE_FLAGS_DELETE_ON_CLOSE) {
513 status = NT_STATUS_DELETE_PENDING;
514 goto errout;
515 }
516
517 /*
518 * Specified file already exists
519 * so the operation should fail.
520 */
521 if (op->create_disposition == FILE_CREATE) {
522 status = NT_STATUS_OBJECT_NAME_COLLISION;
523 goto errout;
524 }
525
526 if ((op->create_disposition == FILE_SUPERSEDE) ||
527 (op->create_disposition == FILE_OVERWRITE_IF) ||
528 (op->create_disposition == FILE_OVERWRITE)) {
529
530 if (sname == NULL) {
531 if (!smb_sattr_check(
532 op->fqi.fq_fattr.sa_dosattr,
533 op->dattr)) {
534 status =
535 NT_STATUS_ACCESS_DENIED;
536 goto errout;
537 }
538 op->desired_access |=
539 FILE_WRITE_ATTRIBUTES;
540 }
541
542 if (smb_node_is_dir(fnode)) {
543 status = NT_STATUS_ACCESS_DENIED;
544 goto errout;
545 }
546 }
547
548 /* MS-FSA 2.1.5.1.2 */
549 if (op->create_disposition == FILE_SUPERSEDE)
550 op->desired_access |= DELETE;
551 if ((op->create_disposition == FILE_OVERWRITE_IF) ||
552 (op->create_disposition == FILE_OVERWRITE))
553 op->desired_access |= FILE_WRITE_DATA;
554 } else if (rc == ENOENT) { /* File Exists, but Stream doesn't */
555 if (op->create_disposition == FILE_OPEN ||
556 op->create_disposition == FILE_OVERWRITE) {
557 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
558 goto errout;
559 }
560
561 op->desired_access |= FILE_WRITE_DATA;
562 } else { /* Error looking up stream */
563 status = smb_errno2status(rc);
564 fnode = tmp_node;
565 goto errout;
566 }
567
568 /*
569 * Windows seems to check read-only access before file
570 * sharing check.
571 *
572 * Check to see if the file is currently readonly (regardless
573 * of whether this open will make it readonly).
574 * Readonly is ignored on directories.
575 */
576 if (SMB_PATHFILE_IS_READONLY(sr, fnode) &&
577 !smb_node_is_dir(fnode)) {
578 if (op->desired_access &
579 (FILE_WRITE_DATA | FILE_APPEND_DATA)) {
580 status = NT_STATUS_ACCESS_DENIED;
581 goto errout;
582 }
583 if (op->create_options & FILE_DELETE_ON_CLOSE) {
584 status = NT_STATUS_CANNOT_DELETE;
585 goto errout;
586 }
587 }
588
589 /* Dataset roots can't be deleted, so don't set DOC */
590 if ((op->create_options & FILE_DELETE_ON_CLOSE) != 0 &&
591 (fnode->flags & NODE_FLAGS_VFSROOT) != 0) {
592 status = NT_STATUS_CANNOT_DELETE;
593 goto errout;
594 }
595
596 status = smb_fsop_access(sr, sr->user_cr, fnode,
597 op->desired_access);
598
599 if (status != NT_STATUS_SUCCESS)
600 goto errout;
601
602 if (max_requested) {
603 smb_fsop_eaccess(sr, sr->user_cr, fnode, &max_allowed);
604 op->desired_access |= max_allowed;
605 }
606
607 /*
608 * File owner should always get read control + read attr.
609 */
610 if (crgetuid(sr->user_cr) == op->fqi.fq_fattr.sa_vattr.va_uid)
611 op->desired_access |=
612 (READ_CONTROL | FILE_READ_ATTRIBUTES);
613
614 /*
615 * According to MS "dochelp" mail in Mar 2015, any handle
616 * on which read or write access is granted implicitly
617 * gets "read attributes", even if it was not requested.
618 */
619 if ((op->desired_access & FILE_DATA_ALL) != 0)
620 op->desired_access |= FILE_READ_ATTRIBUTES;
621
622 /* If the stream didn't exist, create it now */
623 if (!stream_found) {
624 smb_node_t *tmp_node = fnode;
625
626 bzero(&new_attr, sizeof (new_attr));
627 new_attr.sa_vattr.va_type = VREG;
628 new_attr.sa_vattr.va_mode = S_IRUSR;
629 new_attr.sa_mask |= SMB_AT_TYPE | SMB_AT_MODE;
630
631 rc = smb_fsop_create_stream(sr, sr->user_cr, dnode,
632 fnode, sname, lookup_flags, &new_attr, &fnode);
633 smb_node_release(tmp_node);
634
635 if (rc != 0) {
636 status = smb_errno2status(rc);
637 fnode_held = B_FALSE;
638 goto errout;
639 }
640 op->action_taken = SMB_OACT_CREATED;
641 created = B_TRUE;
642
643 smb_node_unlock(dnode);
644 dnode_wlock = B_FALSE;
645 }
646
647 /*
648 * Oplock break is done prior to sharing checks as the break
649 * may cause other clients to close the file which would
650 * affect the sharing checks, and may delete the file due to
651 * DELETE_ON_CLOSE. This may block, so set the file opening
652 * count before oplock stuff.
653 *
654 * Need the "proposed" ofile (and its TargetOplockKey) for
655 * correct oplock break semantics.
656 */
657 of = smb_ofile_alloc(sr, op, fnode, SMB_FTYPE_DISK,
658 tree_fid);
659 tree_fid = 0; // given to the ofile
660 uniq_fid = of->f_uniqid;
661
662 smb_node_inc_opening_count(fnode);
663 opening_incr = B_TRUE;
664
665 if (!stream_found) {
666 /*
667 * Stake our Share Access claim.
668 */
669 smb_node_wrlock(fnode);
670 fnode_wlock = B_TRUE;
671
672 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid,
673 op->desired_access, op->share_access);
674 if (status != 0)
675 goto errout;
676
677 fnode_shrlk = B_TRUE;
678 smb_node_unlock(fnode);
679 fnode_wlock = B_FALSE;
680 goto stream_created;
681 }
682
683 /*
684 * XXX Supposed to do share access checks next.
685 * [MS-FSA] describes that as part of access check:
686 * 2.1.5.1.2.1 Alg... Check Access to an Existing File
687 *
688 * If CreateDisposition is FILE_OPEN or FILE_OPEN_IF:
689 * If Open.Stream.Oplock is not empty and
690 * Open.Stream.Oplock.State contains BATCH_OPLOCK,
691 * the object store MUST check for an oplock
692 * break according to the algorithm in section 2.1.4.12,
693 * with input values as follows:
694 * Open equal to this operation's Open
695 * Oplock equal to Open.Stream.Oplock
696 * Operation equal to "OPEN"
697 * OpParams containing two members:
698 * DesiredAccess, CreateDisposition
699 *
700 * It's not clear how Windows would ask the FS layer if
701 * the file has a BATCH oplock. We'll use a call to the
702 * common oplock code, which calls smb_oplock_break_OPEN
703 * only if the oplock state contains BATCH_OPLOCK.
704 * See: smb_oplock_break_BATCH()
705 *
706 * Also note: There's a nearly identical section in the
707 * spec. at the start of the "else" part of the above
708 * "if (disposition is overwrite, overwrite_if)" so this
709 * section (oplock break, the share mode check, and the
710 * next oplock_break_HANDLE) are all factored out to be
711 * in all cases above that if/else from the spec.
712 */
713 status = smb_oplock_break_BATCH(fnode, of,
714 op->desired_access, op->create_disposition);
715 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) {
716 if (sr->session->dialect >= SMB_VERS_2_BASE)
717 (void) smb2sr_go_async(sr);
718 (void) smb_oplock_wait_break(fnode, 0);
719 status = 0;
720 }
721 if (status != NT_STATUS_SUCCESS)
722 goto errout;
723
724 /*
725 * Check for sharing violations, and if any,
726 * do oplock break of handle caching.
727 *
728 * Need node_wrlock during shrlock checks,
729 * and not locked during oplock breaks etc.
730 */
731 shrlock_t0 = gethrtime();
732 shrlock_again:
733 smb_node_wrlock(fnode);
734 fnode_wlock = B_TRUE;
735 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid,
736 op->desired_access, op->share_access);
737 smb_node_unlock(fnode);
738 fnode_wlock = B_FALSE;
739
740 /*
741 * [MS-FSA] "OPEN_BREAK_H"
742 * If the (proposed) new open would violate sharing rules,
743 * indicate an oplock break with OPEN_BREAK_H (to break
744 * handle level caching rights) then try again.
745 */
746 if (status == NT_STATUS_SHARING_VIOLATION &&
747 did_break_handle == B_FALSE) {
748 did_break_handle = B_TRUE;
749
750 status = smb_oplock_break_HANDLE(fnode, of);
751 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) {
752 if (sr->session->dialect >= SMB_VERS_2_BASE)
753 (void) smb2sr_go_async(sr);
754 (void) smb_oplock_wait_break(fnode, 0);
755 status = 0;
756 } else {
757 /*
758 * Even when the oplock layer does NOT
759 * give us the special status indicating
760 * we should wait, it may have scheduled
761 * taskq jobs that may close handles.
762 * Give those a chance to run before we
763 * check again for sharing violations.
764 */
765 delay(MSEC_TO_TICK(10));
766 }
767 if (status != NT_STATUS_SUCCESS)
768 goto errout;
769
770 goto shrlock_again;
771 }
772
773 /*
774 * If we still have orphaned durable handles on this file,
775 * let's assume the client has lost interest in those and
776 * close them so they don't cause sharing violations.
777 * See longer comment at smb2_dh_close_my_orphans().
778 */
779 if (status == NT_STATUS_SHARING_VIOLATION &&
780 sr->session->dialect >= SMB_VERS_2_BASE &&
781 did_cleanup_orphans == B_FALSE) {
782
783 did_cleanup_orphans = B_TRUE;
784 smb2_dh_close_my_orphans(sr, of);
785
786 goto shrlock_again;
787 }
788
789 /*
790 * SMB1 expects a 1 sec. delay before returning a
791 * sharing violation error. If breaking oplocks
792 * above took less than a sec, wait some more.
793 * See: smbtorture base.defer_open
794 */
795 if (status == NT_STATUS_SHARING_VIOLATION &&
796 sr->session->dialect < SMB_VERS_2_BASE) {
797 hrtime_t t1 = shrlock_t0 + NANOSEC;
798 hrtime_t now = gethrtime();
799 if (now < t1) {
800 delay(NSEC_TO_TICK_ROUNDUP(t1 - now));
801 }
802 }
803
804 if (status != NT_STATUS_SUCCESS)
805 goto errout;
806 fnode_shrlk = B_TRUE;
807
808 /*
809 * The [MS-FSA] spec. describes this oplock break as
810 * part of the sharing access checks. See:
811 * 2.1.5.1.2.2 Algorithm to Check Sharing Access...
812 * At the end of the share mode tests described there,
813 * if it has not returned "sharing violation", it
814 * specifies a call to the alg. in sec. 2.1.4.12,
815 * that boils down to: smb_oplock_break_OPEN()
816 */
817 status = smb_oplock_break_OPEN(fnode, of,
818 op->desired_access,
819 op->create_disposition);
820 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) {
821 if (sr->session->dialect >= SMB_VERS_2_BASE)
822 (void) smb2sr_go_async(sr);
823 (void) smb_oplock_wait_break(fnode, 0);
824 status = 0;
825 }
826 if (status != NT_STATUS_SUCCESS)
827 goto errout;
828
829 if ((fnode->flags & NODE_FLAGS_DELETE_COMMITTED) != 0) {
830 /*
831 * Breaking the oplock caused the file to be deleted,
832 * so let's bail and pretend the file wasn't found.
833 * Have to duplicate much of the logic found a the
834 * "errout" label here.
835 *
836 * This code path is exercised by smbtorture
837 * smb2.durable-open.delete_on_close1
838 */
839 DTRACE_PROBE1(node_deleted, smb_node_t, fnode);
840 smb_ofile_free(of);
841 of = NULL;
842 last_comp_found = B_FALSE;
843
844 /*
845 * Get all the holds and locks into the state
846 * they would have if lookup had failed.
847 */
848 fnode_shrlk = B_FALSE;
849 smb_fsop_unshrlock(sr->user_cr, fnode, uniq_fid);
850
851 opening_incr = B_FALSE;
852 smb_node_dec_opening_count(fnode);
853
854 fnode_held = B_FALSE;
855 smb_node_release(fnode);
856
857 dnode_wlock = B_TRUE;
858 smb_node_wrlock(dnode);
859
860 goto create;
861 }
862
863 /*
864 * Go ahead with modifications as necessary.
865 */
866 switch (op->create_disposition) {
867 case FILE_SUPERSEDE:
868 case FILE_OVERWRITE_IF:
869 case FILE_OVERWRITE:
870 bzero(&new_attr, sizeof (new_attr));
871 if (sname == NULL) {
872 op->dattr |= FILE_ATTRIBUTE_ARCHIVE;
873 /*
874 * Don't apply readonly until
875 * smb_set_open_attributes
876 */
877 if (op->dattr & FILE_ATTRIBUTE_READONLY) {
878 op->dattr &= ~FILE_ATTRIBUTE_READONLY;
879 op->created_readonly = B_TRUE;
880 }
881 new_attr.sa_dosattr = op->dattr;
882 } else {
883 new_attr.sa_dosattr = FILE_ATTRIBUTE_ARCHIVE;
884 }
885
886 /*
887 * Truncate the file data here.
888 * We set alloc_size = op->dsize later,
889 * after we have an ofile. See:
890 * smb_set_open_attributes
891 */
892 new_attr.sa_vattr.va_size = 0;
893 new_attr.sa_mask = SMB_AT_DOSATTR | SMB_AT_SIZE;
894 rc = smb_fsop_setattr(sr, sr->user_cr, fnode,
895 &new_attr);
896 if (rc != 0) {
897 status = smb_errno2status(rc);
898 goto errout;
899 }
900
901 /*
902 * If file is being replaced, remove existing streams
903 */
904 if (SMB_IS_STREAM(fnode) == 0) {
905 status = smb_fsop_remove_streams(sr,
906 sr->user_cr, fnode);
907 if (status != 0)
908 goto errout;
909 }
910
911 op->action_taken = SMB_OACT_TRUNCATED;
912 break;
913
914 default:
915 /*
916 * FILE_OPEN or FILE_OPEN_IF.
917 */
918 /*
919 * Ignore any user-specified alloc_size for
920 * existing files, to avoid truncation in
921 * smb_set_open_attributes
922 */
923 op->dsize = 0L;
924 op->action_taken = SMB_OACT_OPENED;
925 break;
926 }
927 } else {
928 create:
929 /* Last component was not found. */
930 dnode = op->fqi.fq_dnode;
931
932 if (is_dir == 0)
933 is_stream = smb_is_stream_name(pn->pn_path);
934
935 if ((op->create_disposition == FILE_OPEN) ||
936 (op->create_disposition == FILE_OVERWRITE)) {
937 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
938 goto errout;
939 }
940
941 if ((op->desired_access & ACCESS_SYSTEM_SECURITY) != 0 &&
942 !smb_user_has_security_priv(sr->uid_user, sr->user_cr)) {
943 status = NT_STATUS_ACCESS_DENIED;
944 goto errout;
945 }
946
947 if (pn->pn_fname && smb_is_invalid_filename(pn->pn_fname)) {
948 status = NT_STATUS_OBJECT_NAME_INVALID;
949 goto errout;
950 }
951
952 /*
953 * Don't create in directories marked "Delete on close".
954 */
955 if (dnode->flags & NODE_FLAGS_DELETE_ON_CLOSE) {
956 status = NT_STATUS_DELETE_PENDING;
957 goto errout;
958 }
959
960 /*
961 * Create always sets the DOS attributes, type, and mode
962 * in the if/else below (different for file vs directory).
963 * Don't set the readonly bit until smb_set_open_attributes
964 * or that would prevent this open. Note that op->dattr
965 * needs to be what smb_set_open_attributes will use,
966 * except for the readonly bit.
967 */
968 bzero(&new_attr, sizeof (new_attr));
969 new_attr.sa_mask = SMB_AT_DOSATTR | SMB_AT_TYPE | SMB_AT_MODE;
970 if (op->dattr & FILE_ATTRIBUTE_READONLY) {
971 op->dattr &= ~FILE_ATTRIBUTE_READONLY;
972 op->created_readonly = B_TRUE;
973 }
974
975 /*
976 * SMB create can specify the create time.
977 */
978 if ((op->crtime.tv_sec != 0) &&
979 (op->crtime.tv_sec != UINT_MAX)) {
980 new_attr.sa_mask |= SMB_AT_CRTIME;
981 new_attr.sa_crtime = op->crtime;
982 }
983
984 if (is_dir == 0) {
985 op->dattr |= FILE_ATTRIBUTE_ARCHIVE;
986 new_attr.sa_dosattr = op->dattr;
987 new_attr.sa_vattr.va_type = VREG;
988 if (is_stream)
989 new_attr.sa_vattr.va_mode = S_IRUSR | S_IWUSR;
990 else
991 new_attr.sa_vattr.va_mode =
992 S_IRUSR | S_IRGRP | S_IROTH |
993 S_IWUSR | S_IWGRP | S_IWOTH;
994
995 /*
996 * We set alloc_size = op->dsize later,
997 * (in smb_set_open_attributes) after we
998 * have an ofile on which to save that.
999 *
1000 * Legacy Open&X sets size to alloc_size
1001 * when creating a new file.
1002 */
1003 if (sr->smb_com == SMB_COM_OPEN_ANDX) {
1004 new_attr.sa_vattr.va_size = op->dsize;
1005 new_attr.sa_mask |= SMB_AT_SIZE;
1006 }
1007
1008 rc = smb_fsop_create(sr, sr->user_cr, dnode,
1009 op->fqi.fq_last_comp, &new_attr, &op->fqi.fq_fnode);
1010 } else {
1011 op->dattr |= FILE_ATTRIBUTE_DIRECTORY;
1012 new_attr.sa_dosattr = op->dattr;
1013 new_attr.sa_vattr.va_type = VDIR;
1014 new_attr.sa_vattr.va_mode = 0777;
1015
1016 rc = smb_fsop_mkdir(sr, sr->user_cr, dnode,
1017 op->fqi.fq_last_comp, &new_attr, &op->fqi.fq_fnode);
1018 }
1019 if (rc != 0) {
1020 status = smb_errno2status(rc);
1021 goto errout;
1022 }
1023
1024 /* Create done. */
1025 smb_node_unlock(dnode);
1026 dnode_wlock = B_FALSE;
1027
1028 created = B_TRUE;
1029 op->action_taken = SMB_OACT_CREATED;
1030
1031 /* Note: hold from create */
1032 fnode = op->fqi.fq_fnode;
1033 fnode_held = B_TRUE;
1034
1035 if (max_requested) {
1036 smb_fsop_eaccess(sr, sr->user_cr, fnode, &max_allowed);
1037 op->desired_access |= max_allowed;
1038 }
1039 /*
1040 * We created this object (we own it) so grant
1041 * read_control + read_attributes on this handle,
1042 * even if that was not requested. This avoids
1043 * unexpected access failures later.
1044 */
1045 op->desired_access |= (READ_CONTROL | FILE_READ_ATTRIBUTES);
1046
1047 /* Allocate the ofile and fill in most of it. */
1048 of = smb_ofile_alloc(sr, op, fnode, SMB_FTYPE_DISK,
1049 tree_fid);
1050 tree_fid = 0; // given to the ofile
1051 uniq_fid = of->f_uniqid;
1052
1053 smb_node_inc_opening_count(fnode);
1054 opening_incr = B_TRUE;
1055
1056 /*
1057 * Share access checks...
1058 */
1059 smb_node_wrlock(fnode);
1060 fnode_wlock = B_TRUE;
1061
1062 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid,
1063 op->desired_access, op->share_access);
1064 if (status != 0)
1065 goto errout;
1066 fnode_shrlk = B_TRUE;
1067
1068 /*
1069 * MS-FSA 2.1.5.1.1
1070 * If the Oplock member of the DirectoryStream in
1071 * Link.ParentFile.StreamList (ParentOplock) is
1072 * not empty ... oplock break on the parent...
1073 * (dnode is the parent directory)
1074 *
1075 * This compares of->ParentOplockKey with each
1076 * oplock of->TargetOplockKey and breaks...
1077 * so it's OK that we're passing an OF that's
1078 * NOT a member of dnode->n_ofile_list
1079 *
1080 * The break never blocks, so ignore the return.
1081 */
1082 (void) smb_oplock_break_PARENT(dnode, of);
1083 }
1084
1085 stream_created:
1086 /*
1087 * We might have blocked in smb_oplock_break_OPEN long enough
1088 * so a tree disconnect might have happened. In that case,
1089 * we would be adding an ofile to a tree that's disconnecting,
1090 * which would interfere with tear-down. If so, error out.
1091 */
1092 if (!smb_tree_is_connected(sr->tid_tree)) {
1093 status = NT_STATUS_INVALID_PARAMETER;
1094 goto errout;
1095 }
1096
1097 /*
1098 * Moved this up from smb_ofile_open()
1099 */
1100 if ((rc = smb_fsop_open(fnode, of->f_mode, of->f_cr)) != 0) {
1101 status = smb_errno2status(rc);
1102 goto errout;
1103 }
1104
1105 /*
1106 * Complete this open (add to ofile lists)
1107 */
1108 smb_ofile_open(sr, op, of);
1109 did_open = B_TRUE;
1110
1111 /*
1112 * This MUST be done after ofile creation, so that explicitly
1113 * set timestamps can be remembered on the ofile, and setting
1114 * the readonly flag won't affect access via this open.
1115 */
1116 if ((rc = smb_set_open_attributes(sr, of)) != 0) {
1117 status = smb_errno2status(rc);
1118 goto errout;
1119 }
1120
1121 /*
1122 * We've already done access checks above,
1123 * and want this call to succeed even when
1124 * !(desired_access & FILE_READ_ATTRIBUTES),
1125 * so pass kcred here.
1126 */
1127 op->fqi.fq_fattr.sa_mask = SMB_AT_ALL;
1128 (void) smb_node_getattr(sr, fnode, zone_kcred(), of,
1129 &op->fqi.fq_fattr);
1130
1131 /*
1132 * Propagate the write-through mode from the open params
1133 * to the node: see the notes in the function header.
1134 * XXX: write_through should be a flag on the ofile.
1135 */
1136 if (sr->sr_cfg->skc_sync_enable ||
1137 (op->create_options & FILE_WRITE_THROUGH))
1138 fnode->flags |= NODE_FLAGS_WRITE_THROUGH;
1139
1140 /*
1141 * Set up the fileid and dosattr in open_param for response
1142 */
1143 op->fileid = op->fqi.fq_fattr.sa_vattr.va_nodeid;
1144 op->dattr = op->fqi.fq_fattr.sa_dosattr;
1145
1146 /*
1147 * Set up the file type in open_param for the response
1148 */
1149 op->ftype = SMB_FTYPE_DISK;
1150 sr->smb_fid = of->f_fid;
1151 sr->fid_ofile = of;
1152
1153 if (smb_node_is_file(fnode)) {
1154 op->dsize = op->fqi.fq_fattr.sa_vattr.va_size;
1155 } else {
1156 /* directory or symlink */
1157 op->dsize = 0;
1158 }
1159
1160 /*
1161 * Note: oplock_acquire happens in callers, because
1162 * how that happens is protocol-specific.
1163 */
1164
1165 if (sname != NULL)
1166 kmem_free(sname, MAXNAMELEN);
1167 if (fnode_wlock)
1168 smb_node_unlock(fnode);
1169 if (opening_incr)
1170 smb_node_dec_opening_count(fnode);
1171 if (fnode_held)
1172 smb_node_release(fnode);
1173 if (dnode_wlock)
1174 smb_node_unlock(dnode);
1175 if (dnode_held)
1176 smb_node_release(dnode);
1177
1178 return (NT_STATUS_SUCCESS);
1179
1180 errout:
1181 if (did_open) {
1182 smb_ofile_close(of, 0);
1183 /* rele via sr->fid_ofile */
1184 } else if (of != NULL) {
1185 /* No other refs possible */
1186 smb_ofile_free(of);
1187 }
1188
1189 if (fnode_shrlk)
1190 smb_fsop_unshrlock(sr->user_cr, fnode, uniq_fid);
1191
1192 if (created) {
1193 /* Try to roll-back create. */
1194 smb_delete_new_object(sr);
1195 }
1196
1197 if (sname != NULL)
1198 kmem_free(sname, MAXNAMELEN);
1199 if (fnode_wlock)
1200 smb_node_unlock(fnode);
1201 if (opening_incr)
1202 smb_node_dec_opening_count(fnode);
1203 if (fnode_held)
1204 smb_node_release(fnode);
1205 if (dnode_wlock)
1206 smb_node_unlock(dnode);
1207 if (dnode_held)
1208 smb_node_release(dnode);
1209
1210 if (tree_fid != 0)
1211 smb_idpool_free(&tree->t_fid_pool, tree_fid);
1212
1213 return (status);
1214 }
1215
1216 /*
1217 * smb_set_open_attributes
1218 *
1219 * Last write time:
1220 * - If the last_write time specified in the open params is not 0 or -1,
1221 * use it as file's mtime. This will be considered an explicitly set
1222 * timestamps, not reset by subsequent writes.
1223 *
1224 * DOS attributes
1225 * - If we created_readonly, we now store the real DOS attributes
1226 * (including the readonly bit) so subsequent opens will see it.
1227 *
1228 * Returns: errno
1229 */
1230 static int
smb_set_open_attributes(smb_request_t * sr,smb_ofile_t * of)1231 smb_set_open_attributes(smb_request_t *sr, smb_ofile_t *of)
1232 {
1233 smb_attr_t attr;
1234 smb_arg_open_t *op = &sr->sr_open;
1235 smb_node_t *node = of->f_node;
1236 int rc = 0;
1237
1238 bzero(&attr, sizeof (smb_attr_t));
1239
1240 if (op->created_readonly) {
1241 attr.sa_dosattr = op->dattr | FILE_ATTRIBUTE_READONLY;
1242 attr.sa_mask |= SMB_AT_DOSATTR;
1243 }
1244
1245 if (op->dsize != 0) {
1246 attr.sa_allocsz = op->dsize;
1247 attr.sa_mask |= SMB_AT_ALLOCSZ;
1248 }
1249
1250 if ((op->mtime.tv_sec != 0) && (op->mtime.tv_sec != UINT_MAX)) {
1251 attr.sa_vattr.va_mtime = op->mtime;
1252 attr.sa_mask |= SMB_AT_MTIME;
1253 }
1254
1255 if (attr.sa_mask != 0)
1256 rc = smb_node_setattr(sr, node, of->f_cr, of, &attr);
1257
1258 return (rc);
1259 }
1260
1261 /*
1262 * This function is used to delete a newly created object (file or
1263 * directory) if an error occurs after creation of the object.
1264 */
1265 static void
smb_delete_new_object(smb_request_t * sr)1266 smb_delete_new_object(smb_request_t *sr)
1267 {
1268 smb_arg_open_t *op = &sr->sr_open;
1269 smb_fqi_t *fqi = &(op->fqi);
1270 uint32_t flags = 0;
1271
1272 if (SMB_TREE_IS_CASEINSENSITIVE(sr))
1273 flags |= SMB_IGNORE_CASE;
1274 if (SMB_TREE_SUPPORTS_CATIA(sr))
1275 flags |= SMB_CATIA;
1276
1277 if (op->create_options & FILE_DIRECTORY_FILE)
1278 (void) smb_fsop_rmdir(sr, sr->user_cr, fqi->fq_dnode,
1279 fqi->fq_last_comp, flags);
1280 else
1281 (void) smb_fsop_remove(sr, sr->user_cr, fqi->fq_dnode,
1282 fqi->fq_last_comp, flags);
1283 }
1284