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 * Copyright 2022 RackTop Systems, Inc.
26 */
27
28 /*
29 * This module provides the common open functionality to the various
30 * open and create SMB interface functions.
31 */
32
33 #include <sys/types.h>
34 #include <sys/cmn_err.h>
35 #include <sys/fcntl.h>
36 #include <sys/nbmlock.h>
37 #include <smbsrv/string.h>
38 #include <smbsrv/smb2_kproto.h>
39 #include <smbsrv/smb_fsops.h>
40 #include <smbsrv/smbinfo.h>
41
42 extern uint32_t smb_is_executable(char *);
43 static void smb_delete_new_object(smb_request_t *);
44 static int smb_set_open_attributes(smb_request_t *, smb_ofile_t *);
45
46 /*
47 * smb_access_generic_to_file
48 *
49 * Search MSDN for IoCreateFile to see following mapping.
50 *
51 * GENERIC_READ STANDARD_RIGHTS_READ, FILE_READ_DATA,
52 * FILE_READ_ATTRIBUTES and FILE_READ_EA
53 *
54 * GENERIC_WRITE STANDARD_RIGHTS_WRITE, FILE_WRITE_DATA,
55 * FILE_WRITE_ATTRIBUTES, FILE_WRITE_EA, and FILE_APPEND_DATA
56 *
57 * GENERIC_EXECUTE STANDARD_RIGHTS_EXECUTE, SYNCHRONIZE, and FILE_EXECUTE.
58 */
59 static uint32_t
smb_access_generic_to_file(uint32_t desired_access)60 smb_access_generic_to_file(uint32_t desired_access)
61 {
62 uint32_t access = 0;
63
64 if (desired_access & GENERIC_ALL)
65 return (FILE_ALL_ACCESS & ~SYNCHRONIZE);
66
67 if (desired_access & GENERIC_EXECUTE) {
68 desired_access &= ~GENERIC_EXECUTE;
69 access |= (STANDARD_RIGHTS_EXECUTE |
70 SYNCHRONIZE | FILE_EXECUTE);
71 }
72
73 if (desired_access & GENERIC_WRITE) {
74 desired_access &= ~GENERIC_WRITE;
75 access |= (FILE_GENERIC_WRITE & ~SYNCHRONIZE);
76 }
77
78 if (desired_access & GENERIC_READ) {
79 desired_access &= ~GENERIC_READ;
80 access |= FILE_GENERIC_READ;
81 }
82
83 return (access | desired_access);
84 }
85
86 /*
87 * smb_omode_to_amask
88 *
89 * This function converts open modes used by Open and Open AndX
90 * commands to desired access bits used by NT Create AndX command.
91 */
92 uint32_t
smb_omode_to_amask(uint32_t desired_access)93 smb_omode_to_amask(uint32_t desired_access)
94 {
95 switch (desired_access & SMB_DA_ACCESS_MASK) {
96 case SMB_DA_ACCESS_READ:
97 return (FILE_GENERIC_READ);
98
99 case SMB_DA_ACCESS_WRITE:
100 return (FILE_GENERIC_WRITE);
101
102 case SMB_DA_ACCESS_READ_WRITE:
103 return (FILE_GENERIC_READ | FILE_GENERIC_WRITE);
104
105 case SMB_DA_ACCESS_EXECUTE:
106 return (FILE_GENERIC_READ | FILE_GENERIC_EXECUTE);
107
108 default:
109 return (FILE_GENERIC_ALL);
110 }
111 }
112
113 /*
114 * smb_denymode_to_sharemode
115 *
116 * This function converts deny modes used by Open and Open AndX
117 * commands to share access bits used by NT Create AndX command.
118 */
119 uint32_t
smb_denymode_to_sharemode(uint32_t desired_access,char * fname)120 smb_denymode_to_sharemode(uint32_t desired_access, char *fname)
121 {
122 switch (desired_access & SMB_DA_SHARE_MASK) {
123 case SMB_DA_SHARE_COMPATIBILITY:
124 if (smb_is_executable(fname))
125 return (FILE_SHARE_READ | FILE_SHARE_WRITE);
126
127 return (FILE_SHARE_ALL);
128
129 case SMB_DA_SHARE_EXCLUSIVE:
130 return (FILE_SHARE_NONE);
131
132 case SMB_DA_SHARE_DENY_WRITE:
133 return (FILE_SHARE_READ);
134
135 case SMB_DA_SHARE_DENY_READ:
136 return (FILE_SHARE_WRITE);
137
138 case SMB_DA_SHARE_DENY_NONE:
139 default:
140 return (FILE_SHARE_READ | FILE_SHARE_WRITE);
141 }
142 }
143
144 /*
145 * smb_ofun_to_crdisposition
146 *
147 * This function converts open function values used by Open and Open AndX
148 * commands to create disposition values used by NT Create AndX command.
149 */
150 uint32_t
smb_ofun_to_crdisposition(uint16_t ofun)151 smb_ofun_to_crdisposition(uint16_t ofun)
152 {
153 static int ofun_cr_map[3][2] =
154 {
155 { -1, FILE_CREATE },
156 { FILE_OPEN, FILE_OPEN_IF },
157 { FILE_OVERWRITE, FILE_OVERWRITE_IF }
158 };
159
160 int row = ofun & SMB_OFUN_OPEN_MASK;
161 int col = (ofun & SMB_OFUN_CREATE_MASK) >> 4;
162
163 if (row == 3)
164 return (FILE_MAXIMUM_DISPOSITION + 1);
165
166 return (ofun_cr_map[row][col]);
167 }
168
169 /*
170 * smb_common_open
171 *
172 * Notes on write-through behaviour. It looks like pre-LM0.12 versions
173 * of the protocol specify the write-through mode when a file is opened,
174 * (SmbOpen, SmbOpenAndX) so the write calls (SmbWrite, SmbWriteAndClose,
175 * SmbWriteAndUnlock) don't need to contain a write-through flag.
176 *
177 * With LM0.12, the open calls (SmbCreateAndX, SmbNtTransactCreate)
178 * don't indicate which write-through mode to use. Instead the write
179 * calls (SmbWriteAndX, SmbWriteRaw) specify the mode on a per call
180 * basis.
181 *
182 * We don't care which open call was used to get us here, we just need
183 * to ensure that the write-through mode flag is copied from the open
184 * parameters to the node. We test the omode write-through flag in all
185 * write functions.
186 *
187 * This function returns NT status codes.
188 *
189 * The following rules apply when processing a file open request:
190 *
191 * - Oplocks must be broken prior to share checking as the break may
192 * cause other clients to close the file, which would affect sharing
193 * checks.
194 *
195 * - Share checks must take place prior to access checks for correct
196 * Windows semantics and to prevent unnecessary NFS delegation recalls.
197 *
198 * - Oplocks must be acquired after open to ensure the correct
199 * synchronization with NFS delegation and FEM installation.
200 *
201 * DOS readonly bit rules
202 *
203 * 1. The creator of a readonly file can write to/modify the size of the file
204 * using the original create fid, even though the file will appear as readonly
205 * to all other fids and via a CIFS getattr call.
206 *
207 * 2. A setinfo operation (using either an open fid or a path) to set/unset
208 * readonly will be successful regardless of whether a creator of a readonly
209 * file has an open fid.
210 *
211 * 3. The DOS readonly bit affects only data and some metadata.
212 * The following metadata can be changed regardless of the readonly bit:
213 * - security descriptors
214 * - DOS attributes
215 * - timestamps
216 *
217 * In the current implementation, the file size cannot be changed (except for
218 * the exceptions in #1 and #2, above).
219 *
220 *
221 * DOS attribute rules
222 *
223 * These rules are specific to creating / opening files and directories.
224 * How the attribute value (specifically ZERO or FILE_ATTRIBUTE_NORMAL)
225 * should be interpreted may differ in other requests.
226 *
227 * - An attribute value equal to ZERO or FILE_ATTRIBUTE_NORMAL means that the
228 * file's attributes should be cleared.
229 * - If FILE_ATTRIBUTE_NORMAL is specified with any other attributes,
230 * FILE_ATTRIBUTE_NORMAL is ignored.
231 *
232 * 1. Creating a new file
233 * - The request attributes + FILE_ATTRIBUTE_ARCHIVE are applied to the file.
234 *
235 * 2. Creating a new directory
236 * - The request attributes + FILE_ATTRIBUTE_DIRECTORY are applied to the file.
237 * - FILE_ATTRIBUTE_ARCHIVE does not get set.
238 *
239 * 3. Overwriting an existing file
240 * - the request attributes are used as search attributes. If the existing
241 * file does not meet the search criteria access is denied.
242 * - otherwise, applies attributes + FILE_ATTRIBUTE_ARCHIVE.
243 *
244 * 4. Opening an existing file or directory
245 * The request attributes are ignored.
246 */
247 uint32_t
smb_common_open(smb_request_t * sr)248 smb_common_open(smb_request_t *sr)
249 {
250 smb_server_t *sv = sr->sr_server;
251 smb_tree_t *tree = sr->tid_tree;
252 smb_node_t *fnode = NULL;
253 smb_node_t *dnode = NULL;
254 smb_node_t *cur_node = NULL;
255 smb_node_t *tmp_node = NULL;
256 smb_arg_open_t *op = &sr->sr_open;
257 smb_pathname_t *pn = &op->fqi.fq_path;
258 smb_ofile_t *of = NULL;
259 smb_attr_t new_attr;
260 hrtime_t shrlock_t0;
261 int max_requested = 0;
262 uint32_t max_allowed;
263 uint32_t status = NT_STATUS_SUCCESS;
264 int is_dir;
265 int rc;
266 boolean_t is_stream = B_FALSE;
267 int lookup_flags = SMB_FOLLOW_LINKS;
268 uint32_t uniq_fid = 0;
269 uint16_t tree_fid = 0;
270 boolean_t created = B_FALSE;
271 boolean_t last_comp_found = B_FALSE;
272 boolean_t stream_found = B_FALSE;
273 boolean_t opening_incr = B_FALSE;
274 boolean_t dnode_held = B_FALSE;
275 boolean_t dnode_wlock = B_FALSE;
276 boolean_t fnode_held = B_FALSE;
277 boolean_t fnode_wlock = B_FALSE;
278 boolean_t fnode_shrlk = B_FALSE;
279 boolean_t did_open = B_FALSE;
280 boolean_t did_break_handle = B_FALSE;
281 boolean_t did_cleanup_orphans = B_FALSE;
282 char *sname = NULL;
283
284 /* Get out now if we've been cancelled. */
285 mutex_enter(&sr->sr_mutex);
286 if (sr->sr_state != SMB_REQ_STATE_ACTIVE) {
287 mutex_exit(&sr->sr_mutex);
288 return (NT_STATUS_CANCELLED);
289 }
290 mutex_exit(&sr->sr_mutex);
291
292 is_dir = (op->create_options & FILE_DIRECTORY_FILE) ? 1 : 0;
293
294 /*
295 * If the object being created or opened is a directory
296 * the Disposition parameter must be one of FILE_CREATE,
297 * FILE_OPEN, or FILE_OPEN_IF
298 */
299 if (is_dir) {
300 if ((op->create_disposition != FILE_CREATE) &&
301 (op->create_disposition != FILE_OPEN_IF) &&
302 (op->create_disposition != FILE_OPEN)) {
303 return (NT_STATUS_INVALID_PARAMETER);
304 }
305 }
306
307 if (op->desired_access & MAXIMUM_ALLOWED) {
308 max_requested = 1;
309 op->desired_access &= ~MAXIMUM_ALLOWED;
310 }
311 op->desired_access = smb_access_generic_to_file(op->desired_access);
312
313 if (sr->session->s_cfg.skc_max_opens != 0 &&
314 sr->session->s_file_cnt >= sr->session->s_cfg.skc_max_opens) {
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 = op->fqi.fq_fnode;
435 fnode_held = B_TRUE;
436
437 /*
438 * Need the DOS attributes below, where we
439 * check the search attributes (sattr).
440 * Also UID, for owner check below.
441 */
442 op->fqi.fq_fattr.sa_mask = SMB_AT_DOSATTR | SMB_AT_UID;
443 rc = smb_node_getattr(sr, op->fqi.fq_fnode, zone_kcred(),
444 NULL, &op->fqi.fq_fattr);
445 if (rc != 0) {
446 status = NT_STATUS_INTERNAL_ERROR;
447 goto errout;
448 }
449 } else if (rc == ENOENT) {
450 last_comp_found = B_FALSE;
451 op->fqi.fq_fnode = NULL;
452 rc = 0;
453 } else {
454 status = smb_errno2status(rc);
455 goto errout;
456 }
457
458 if (last_comp_found) {
459
460 fnode = op->fqi.fq_fnode;
461 dnode = op->fqi.fq_dnode;
462
463 if (!smb_node_is_file(fnode) &&
464 !smb_node_is_dir(fnode) &&
465 !smb_node_is_symlink(fnode)) {
466 status = NT_STATUS_ACCESS_DENIED;
467 goto errout;
468 }
469
470 /*
471 * Reject this request if either:
472 * - the target IS a directory and the client requires that
473 * it must NOT be (required by Lotus Notes)
474 * - the target is NOT a directory and client requires that
475 * it MUST be.
476 * Streams are never directories.
477 */
478 if (smb_node_is_dir(fnode) && sname == NULL) {
479 if (op->create_options & FILE_NON_DIRECTORY_FILE) {
480 status = NT_STATUS_FILE_IS_A_DIRECTORY;
481 goto errout;
482 }
483 } else {
484 if ((op->create_options & FILE_DIRECTORY_FILE) ||
485 (op->nt_flags & NT_CREATE_FLAG_OPEN_TARGET_DIR)) {
486 status = NT_STATUS_NOT_A_DIRECTORY;
487 goto errout;
488 }
489 }
490
491 /* If we're given a stream name, look it up now */
492 if (sname != NULL) {
493 tmp_node = fnode;
494 rc = smb_fsop_lookup_stream(sr, zone_kcred(),
495 lookup_flags, sr->tid_tree->t_snode, fnode, sname,
496 &fnode);
497 } else {
498 rc = 0;
499 }
500
501 if (rc == 0) { /* Stream Exists (including unnamed stream) */
502 stream_found = B_TRUE;
503 smb_node_unlock(dnode);
504 dnode_wlock = B_FALSE;
505
506 if (tmp_node != NULL)
507 smb_node_release(tmp_node);
508
509 /*
510 * No more open should be accepted when
511 * "Delete on close" flag is set.
512 */
513 if (fnode->flags & NODE_FLAGS_DELETE_ON_CLOSE) {
514 status = NT_STATUS_DELETE_PENDING;
515 goto errout;
516 }
517
518 /*
519 * Specified file already exists
520 * so the operation should fail.
521 */
522 if (op->create_disposition == FILE_CREATE) {
523 status = NT_STATUS_OBJECT_NAME_COLLISION;
524 goto errout;
525 }
526
527 if ((op->create_disposition == FILE_SUPERSEDE) ||
528 (op->create_disposition == FILE_OVERWRITE_IF) ||
529 (op->create_disposition == FILE_OVERWRITE)) {
530
531 if (sname == NULL) {
532 if (!smb_sattr_check(
533 op->fqi.fq_fattr.sa_dosattr,
534 op->dattr)) {
535 status =
536 NT_STATUS_ACCESS_DENIED;
537 goto errout;
538 }
539 op->desired_access |=
540 FILE_WRITE_ATTRIBUTES;
541 }
542
543 if (smb_node_is_dir(fnode)) {
544 status = NT_STATUS_ACCESS_DENIED;
545 goto errout;
546 }
547 }
548
549 /* MS-FSA 2.1.5.1.2 */
550 if (op->create_disposition == FILE_SUPERSEDE)
551 op->desired_access |= DELETE;
552 if ((op->create_disposition == FILE_OVERWRITE_IF) ||
553 (op->create_disposition == FILE_OVERWRITE))
554 op->desired_access |= FILE_WRITE_DATA;
555 } else if (rc == ENOENT) { /* File Exists, but Stream doesn't */
556 if (op->create_disposition == FILE_OPEN ||
557 op->create_disposition == FILE_OVERWRITE) {
558 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
559 goto errout;
560 }
561
562 op->desired_access |= FILE_WRITE_DATA;
563 } else { /* Error looking up stream */
564 status = smb_errno2status(rc);
565 fnode = tmp_node;
566 goto errout;
567 }
568
569 /*
570 * Windows seems to check read-only access before file
571 * sharing check.
572 *
573 * Check to see if the file is currently readonly (regardless
574 * of whether this open will make it readonly).
575 * Readonly is ignored on directories.
576 */
577 if (SMB_PATHFILE_IS_READONLY(sr, fnode) &&
578 !smb_node_is_dir(fnode)) {
579 if (op->desired_access &
580 (FILE_WRITE_DATA | FILE_APPEND_DATA)) {
581 status = NT_STATUS_ACCESS_DENIED;
582 goto errout;
583 }
584 if (op->create_options & FILE_DELETE_ON_CLOSE) {
585 status = NT_STATUS_CANNOT_DELETE;
586 goto errout;
587 }
588 }
589
590 /* Dataset roots can't be deleted, so don't set DOC */
591 if ((op->create_options & FILE_DELETE_ON_CLOSE) != 0 &&
592 (fnode->flags & NODE_FLAGS_VFSROOT) != 0) {
593 status = NT_STATUS_CANNOT_DELETE;
594 goto errout;
595 }
596
597 status = smb_fsop_access(sr, sr->user_cr, fnode,
598 op->desired_access);
599
600 if (status != NT_STATUS_SUCCESS)
601 goto errout;
602
603 if (max_requested) {
604 smb_fsop_eaccess(sr, sr->user_cr, fnode, &max_allowed);
605 op->desired_access |= max_allowed;
606 }
607
608 /*
609 * File owner should always get read control + read attr.
610 */
611 if (crgetuid(sr->user_cr) == op->fqi.fq_fattr.sa_vattr.va_uid)
612 op->desired_access |=
613 (READ_CONTROL | FILE_READ_ATTRIBUTES);
614
615 /*
616 * According to MS "dochelp" mail in Mar 2015, any handle
617 * on which read or write access is granted implicitly
618 * gets "read attributes", even if it was not requested.
619 */
620 if ((op->desired_access & FILE_DATA_ALL) != 0)
621 op->desired_access |= FILE_READ_ATTRIBUTES;
622
623 /* If the stream didn't exist, create it now */
624 if (!stream_found) {
625 smb_node_t *tmp_node = fnode;
626
627 bzero(&new_attr, sizeof (new_attr));
628 new_attr.sa_vattr.va_type = VREG;
629 new_attr.sa_vattr.va_mode = S_IRUSR;
630 new_attr.sa_mask |= SMB_AT_TYPE | SMB_AT_MODE;
631
632 rc = smb_fsop_create_stream(sr, sr->user_cr, dnode,
633 fnode, sname, lookup_flags, &new_attr, &fnode);
634 smb_node_release(tmp_node);
635
636 if (rc != 0) {
637 status = smb_errno2status(rc);
638 fnode_held = B_FALSE;
639 goto errout;
640 }
641 op->action_taken = SMB_OACT_CREATED;
642 created = B_TRUE;
643
644 smb_node_unlock(dnode);
645 dnode_wlock = B_FALSE;
646 }
647
648 /*
649 * Oplock break is done prior to sharing checks as the break
650 * may cause other clients to close the file which would
651 * affect the sharing checks, and may delete the file due to
652 * DELETE_ON_CLOSE. This may block, so set the file opening
653 * count before oplock stuff.
654 *
655 * Need the "proposed" ofile (and its TargetOplockKey) for
656 * correct oplock break semantics.
657 */
658 of = smb_ofile_alloc(sr, op, fnode, SMB_FTYPE_DISK,
659 tree_fid);
660 tree_fid = 0; // given to the ofile
661 uniq_fid = of->f_uniqid;
662
663 smb_node_inc_opening_count(fnode);
664 opening_incr = B_TRUE;
665
666 if (!stream_found) {
667 /*
668 * Stake our Share Access claim.
669 */
670 smb_node_wrlock(fnode);
671 fnode_wlock = B_TRUE;
672
673 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid,
674 op->desired_access, op->share_access);
675 if (status != 0)
676 goto errout;
677
678 fnode_shrlk = B_TRUE;
679 smb_node_unlock(fnode);
680 fnode_wlock = B_FALSE;
681 goto stream_created;
682 }
683
684 /*
685 * XXX Supposed to do share access checks next.
686 * [MS-FSA] describes that as part of access check:
687 * 2.1.5.1.2.1 Alg... Check Access to an Existing File
688 *
689 * If CreateDisposition is FILE_OPEN or FILE_OPEN_IF:
690 * If Open.Stream.Oplock is not empty and
691 * Open.Stream.Oplock.State contains BATCH_OPLOCK,
692 * the object store MUST check for an oplock
693 * break according to the algorithm in section 2.1.4.12,
694 * with input values as follows:
695 * Open equal to this operation's Open
696 * Oplock equal to Open.Stream.Oplock
697 * Operation equal to "OPEN"
698 * OpParams containing two members:
699 * DesiredAccess, CreateDisposition
700 *
701 * It's not clear how Windows would ask the FS layer if
702 * the file has a BATCH oplock. We'll use a call to the
703 * common oplock code, which calls smb_oplock_break_OPEN
704 * only if the oplock state contains BATCH_OPLOCK.
705 * See: smb_oplock_break_BATCH()
706 *
707 * Also note: There's a nearly identical section in the
708 * spec. at the start of the "else" part of the above
709 * "if (disposition is overwrite, overwrite_if)" so this
710 * section (oplock break, the share mode check, and the
711 * next oplock_break_HANDLE) are all factored out to be
712 * in all cases above that if/else from the spec.
713 */
714 status = smb_oplock_break_BATCH(fnode, of,
715 op->desired_access, op->create_disposition);
716 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) {
717 if (sr->session->dialect >= SMB_VERS_2_BASE)
718 (void) smb2sr_go_async(sr);
719 status = smb_oplock_wait_break(sr, fnode, 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 status = smb_oplock_wait_break(sr, fnode, 0);
755 } else {
756 /*
757 * Even when the oplock layer does NOT
758 * give us the special status indicating
759 * we should wait, it may have scheduled
760 * taskq jobs that may close handles.
761 * Give those a chance to run before we
762 * check again for sharing violations.
763 */
764 delay(MSEC_TO_TICK(10));
765 }
766 if (status != NT_STATUS_SUCCESS)
767 goto errout;
768
769 goto shrlock_again;
770 }
771
772 /*
773 * If we still have orphaned durable handles on this file,
774 * let's assume the client has lost interest in those and
775 * close them so they don't cause sharing violations.
776 * See longer comment at smb2_dh_close_my_orphans().
777 */
778 if (status == NT_STATUS_SHARING_VIOLATION &&
779 sr->session->dialect >= SMB_VERS_2_BASE &&
780 did_cleanup_orphans == B_FALSE) {
781
782 did_cleanup_orphans = B_TRUE;
783 smb2_dh_close_my_orphans(sr, of);
784
785 goto shrlock_again;
786 }
787
788 /*
789 * SMB1 expects a 1 sec. delay before returning a
790 * sharing violation error. If breaking oplocks
791 * above took less than a sec, wait some more.
792 * See: smbtorture base.defer_open
793 */
794 if (status == NT_STATUS_SHARING_VIOLATION &&
795 sr->session->dialect < SMB_VERS_2_BASE) {
796 hrtime_t t1 = shrlock_t0 + NANOSEC;
797 hrtime_t now = gethrtime();
798 if (now < t1) {
799 delay(NSEC_TO_TICK_ROUNDUP(t1 - now));
800 }
801 }
802
803 if (status != NT_STATUS_SUCCESS)
804 goto errout;
805 fnode_shrlk = B_TRUE;
806
807 /*
808 * The [MS-FSA] spec. describes this oplock break as
809 * part of the sharing access checks. See:
810 * 2.1.5.1.2.2 Algorithm to Check Sharing Access...
811 * At the end of the share mode tests described there,
812 * if it has not returned "sharing violation", it
813 * specifies a call to the alg. in sec. 2.1.4.12,
814 * that boils down to: smb_oplock_break_OPEN()
815 */
816 status = smb_oplock_break_OPEN(fnode, of,
817 op->desired_access,
818 op->create_disposition);
819 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) {
820 if (sr->session->dialect >= SMB_VERS_2_BASE)
821 (void) smb2sr_go_async(sr);
822 status = smb_oplock_wait_break(sr, fnode, 0);
823 }
824 if (status != NT_STATUS_SUCCESS)
825 goto errout;
826
827 if ((fnode->flags & NODE_FLAGS_DELETE_COMMITTED) != 0) {
828 /*
829 * Breaking the oplock caused the file to be deleted,
830 * so let's bail and pretend the file wasn't found.
831 * Have to duplicate much of the logic found a the
832 * "errout" label here.
833 *
834 * This code path is exercised by smbtorture
835 * smb2.durable-open.delete_on_close1
836 */
837 DTRACE_PROBE1(node_deleted, smb_node_t *, fnode);
838 tree_fid = of->f_fid;
839 of->f_fid = 0;
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 (is_dir != 0 &&
942 (op->dattr & FILE_ATTRIBUTE_TEMPORARY) != 0) {
943 status = NT_STATUS_INVALID_PARAMETER;
944 goto errout;
945 }
946
947 if ((op->dattr & FILE_ATTRIBUTE_READONLY) != 0 &&
948 (op->create_options & FILE_DELETE_ON_CLOSE) != 0) {
949 status = NT_STATUS_CANNOT_DELETE;
950 goto errout;
951 }
952
953 if ((op->desired_access & ACCESS_SYSTEM_SECURITY) != 0 &&
954 !smb_user_has_security_priv(sr->uid_user, sr->user_cr)) {
955 status = NT_STATUS_ACCESS_DENIED;
956 goto errout;
957 }
958
959 if (pn->pn_fname && smb_is_invalid_filename(pn->pn_fname)) {
960 status = NT_STATUS_OBJECT_NAME_INVALID;
961 goto errout;
962 }
963
964 /*
965 * Don't create in directories marked "Delete on close".
966 */
967 if (dnode->flags & NODE_FLAGS_DELETE_ON_CLOSE) {
968 status = NT_STATUS_DELETE_PENDING;
969 goto errout;
970 }
971
972 /*
973 * Create always sets the DOS attributes, type, and mode
974 * in the if/else below (different for file vs directory).
975 * Don't set the readonly bit until smb_set_open_attributes
976 * or that would prevent this open. Note that op->dattr
977 * needs to be what smb_set_open_attributes will use,
978 * except for the readonly bit.
979 */
980 bzero(&new_attr, sizeof (new_attr));
981 new_attr.sa_mask = SMB_AT_DOSATTR | SMB_AT_TYPE | SMB_AT_MODE;
982 if (op->dattr & FILE_ATTRIBUTE_READONLY) {
983 op->dattr &= ~FILE_ATTRIBUTE_READONLY;
984 op->created_readonly = B_TRUE;
985 }
986
987 /*
988 * SMB create can specify the create time.
989 */
990 if ((op->crtime.tv_sec != 0) &&
991 (op->crtime.tv_sec != UINT_MAX)) {
992 new_attr.sa_mask |= SMB_AT_CRTIME;
993 new_attr.sa_crtime = op->crtime;
994 }
995
996 if (is_dir == 0) {
997 op->dattr |= FILE_ATTRIBUTE_ARCHIVE;
998 new_attr.sa_dosattr = op->dattr;
999 new_attr.sa_vattr.va_type = VREG;
1000 if (is_stream)
1001 new_attr.sa_vattr.va_mode = S_IRUSR | S_IWUSR;
1002 else
1003 new_attr.sa_vattr.va_mode =
1004 S_IRUSR | S_IRGRP | S_IROTH |
1005 S_IWUSR | S_IWGRP | S_IWOTH;
1006
1007 /*
1008 * We set alloc_size = op->dsize later,
1009 * (in smb_set_open_attributes) after we
1010 * have an ofile on which to save that.
1011 *
1012 * Legacy Open&X sets size to alloc_size
1013 * when creating a new file.
1014 */
1015 if (sr->smb_com == SMB_COM_OPEN_ANDX) {
1016 new_attr.sa_vattr.va_size = op->dsize;
1017 new_attr.sa_mask |= SMB_AT_SIZE;
1018 }
1019
1020 rc = smb_fsop_create(sr, sr->user_cr, dnode,
1021 op->fqi.fq_last_comp, &new_attr, &op->fqi.fq_fnode);
1022 } else {
1023 op->dattr |= FILE_ATTRIBUTE_DIRECTORY;
1024 new_attr.sa_dosattr = op->dattr;
1025 new_attr.sa_vattr.va_type = VDIR;
1026 new_attr.sa_vattr.va_mode = 0777;
1027
1028 rc = smb_fsop_mkdir(sr, sr->user_cr, dnode,
1029 op->fqi.fq_last_comp, &new_attr, &op->fqi.fq_fnode);
1030 }
1031 if (rc != 0) {
1032 status = smb_errno2status(rc);
1033 goto errout;
1034 }
1035
1036 /* Create done. */
1037 smb_node_unlock(dnode);
1038 dnode_wlock = B_FALSE;
1039
1040 created = B_TRUE;
1041 op->action_taken = SMB_OACT_CREATED;
1042
1043 /* Note: hold from create */
1044 fnode = op->fqi.fq_fnode;
1045 fnode_held = B_TRUE;
1046
1047 if (max_requested) {
1048 smb_fsop_eaccess(sr, sr->user_cr, fnode, &max_allowed);
1049 op->desired_access |= max_allowed;
1050 }
1051 /*
1052 * We created this object (we own it) so grant
1053 * read_control + read_attributes on this handle,
1054 * even if that was not requested. This avoids
1055 * unexpected access failures later.
1056 */
1057 op->desired_access |= (READ_CONTROL | FILE_READ_ATTRIBUTES);
1058
1059 /* Allocate the ofile and fill in most of it. */
1060 of = smb_ofile_alloc(sr, op, fnode, SMB_FTYPE_DISK,
1061 tree_fid);
1062 tree_fid = 0; // given to the ofile
1063 uniq_fid = of->f_uniqid;
1064
1065 smb_node_inc_opening_count(fnode);
1066 opening_incr = B_TRUE;
1067
1068 /*
1069 * Share access checks...
1070 */
1071 smb_node_wrlock(fnode);
1072 fnode_wlock = B_TRUE;
1073
1074 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid,
1075 op->desired_access, op->share_access);
1076 if (status != 0)
1077 goto errout;
1078 fnode_shrlk = B_TRUE;
1079
1080 /*
1081 * MS-FSA 2.1.5.1.1
1082 * If the Oplock member of the DirectoryStream in
1083 * Link.ParentFile.StreamList (ParentOplock) is
1084 * not empty ... oplock break on the parent...
1085 * (dnode is the parent directory)
1086 *
1087 * This compares of->ParentOplockKey with each
1088 * oplock of->TargetOplockKey and breaks...
1089 * so it's OK that we're passing an OF that's
1090 * NOT a member of dnode->n_ofile_list
1091 *
1092 * The break never blocks, so ignore the return.
1093 */
1094 (void) smb_oplock_break_PARENT(dnode, of);
1095 }
1096
1097 stream_created:
1098 /*
1099 * We might have blocked in smb_oplock_break_OPEN long enough
1100 * so a tree disconnect might have happened. In that case,
1101 * we would be adding an ofile to a tree that's disconnecting,
1102 * which would interfere with tear-down. If so, error out.
1103 */
1104 if (!smb_tree_is_connected(sr->tid_tree)) {
1105 status = NT_STATUS_INVALID_PARAMETER;
1106 goto errout;
1107 }
1108
1109 /*
1110 * Moved this up from smb_ofile_open()
1111 */
1112 if ((rc = smb_fsop_open(fnode, of->f_mode, of->f_cr)) != 0) {
1113 status = smb_errno2status(rc);
1114 goto errout;
1115 }
1116
1117 /*
1118 * Complete this open (add to ofile lists)
1119 */
1120 smb_ofile_open(sr, op, of);
1121 did_open = B_TRUE;
1122
1123 /*
1124 * This MUST be done after ofile creation, so that explicitly
1125 * set timestamps can be remembered on the ofile, and setting
1126 * the readonly flag won't affect access via this open.
1127 */
1128 if ((rc = smb_set_open_attributes(sr, of)) != 0) {
1129 status = smb_errno2status(rc);
1130 goto errout;
1131 }
1132
1133 /*
1134 * We've already done access checks above,
1135 * and want this call to succeed even when
1136 * !(desired_access & FILE_READ_ATTRIBUTES),
1137 * so pass kcred here.
1138 */
1139 op->fqi.fq_fattr.sa_mask = SMB_AT_ALL;
1140 (void) smb_node_getattr(sr, fnode, zone_kcred(), of,
1141 &op->fqi.fq_fattr);
1142
1143 /*
1144 * Propagate the write-through mode from the open params
1145 * to the node: see the notes in the function header.
1146 * XXX: write_through should be a flag on the ofile.
1147 */
1148 if (sr->sr_cfg->skc_sync_enable ||
1149 (op->create_options & FILE_WRITE_THROUGH))
1150 fnode->flags |= NODE_FLAGS_WRITE_THROUGH;
1151
1152 /*
1153 * Set up the fileid and dosattr in open_param for response
1154 */
1155 op->fileid = op->fqi.fq_fattr.sa_vattr.va_nodeid;
1156 op->dattr = op->fqi.fq_fattr.sa_dosattr;
1157
1158 /*
1159 * Set up the file type in open_param for the response
1160 */
1161 op->ftype = SMB_FTYPE_DISK;
1162 sr->smb_fid = of->f_fid;
1163 sr->fid_ofile = of;
1164
1165 if (smb_node_is_file(fnode)) {
1166 op->dsize = op->fqi.fq_fattr.sa_vattr.va_size;
1167 } else {
1168 /* directory or symlink */
1169 op->dsize = 0;
1170 }
1171
1172 /*
1173 * Note: oplock_acquire happens in callers, because
1174 * how that happens is protocol-specific.
1175 */
1176
1177 if (sname != NULL)
1178 kmem_free(sname, MAXNAMELEN);
1179 if (fnode_wlock)
1180 smb_node_unlock(fnode);
1181 if (opening_incr)
1182 smb_node_dec_opening_count(fnode);
1183 if (fnode_held)
1184 smb_node_release(fnode);
1185 if (dnode_wlock)
1186 smb_node_unlock(dnode);
1187 if (dnode_held)
1188 smb_node_release(dnode);
1189
1190 return (NT_STATUS_SUCCESS);
1191
1192 errout:
1193 if (did_open) {
1194 smb_ofile_close(of, 0);
1195 /* rele via sr->fid_ofile */
1196 } else if (of != NULL) {
1197 /* No other refs possible */
1198 smb_ofile_free(of);
1199 }
1200
1201 if (fnode_shrlk)
1202 smb_fsop_unshrlock(sr->user_cr, fnode, uniq_fid);
1203
1204 if (created) {
1205 /* Try to roll-back create. */
1206 smb_delete_new_object(sr);
1207 }
1208
1209 if (sname != NULL)
1210 kmem_free(sname, MAXNAMELEN);
1211 if (fnode_wlock)
1212 smb_node_unlock(fnode);
1213 if (opening_incr)
1214 smb_node_dec_opening_count(fnode);
1215 if (fnode_held)
1216 smb_node_release(fnode);
1217 if (dnode_wlock)
1218 smb_node_unlock(dnode);
1219 if (dnode_held)
1220 smb_node_release(dnode);
1221
1222 if (tree_fid != 0)
1223 smb_idpool_free(&tree->t_fid_pool, tree_fid);
1224
1225 return (status);
1226 }
1227
1228 /*
1229 * smb_set_open_attributes
1230 *
1231 * Last write time:
1232 * - If the last_write time specified in the open params is not 0 or -1,
1233 * use it as file's mtime. This will be considered an explicitly set
1234 * timestamps, not reset by subsequent writes.
1235 *
1236 * DOS attributes
1237 * - If we created_readonly, we now store the real DOS attributes
1238 * (including the readonly bit) so subsequent opens will see it.
1239 *
1240 * Returns: errno
1241 */
1242 static int
smb_set_open_attributes(smb_request_t * sr,smb_ofile_t * of)1243 smb_set_open_attributes(smb_request_t *sr, smb_ofile_t *of)
1244 {
1245 smb_attr_t attr;
1246 smb_arg_open_t *op = &sr->sr_open;
1247 smb_node_t *node = of->f_node;
1248 int rc = 0;
1249
1250 bzero(&attr, sizeof (smb_attr_t));
1251
1252 if (op->created_readonly) {
1253 attr.sa_dosattr = op->dattr | FILE_ATTRIBUTE_READONLY;
1254 attr.sa_mask |= SMB_AT_DOSATTR;
1255 }
1256
1257 if (op->dsize != 0) {
1258 attr.sa_allocsz = op->dsize;
1259 attr.sa_mask |= SMB_AT_ALLOCSZ;
1260 }
1261
1262 if ((op->mtime.tv_sec != 0) && (op->mtime.tv_sec != UINT_MAX)) {
1263 attr.sa_vattr.va_mtime = op->mtime;
1264 attr.sa_mask |= SMB_AT_MTIME;
1265 }
1266
1267 if (attr.sa_mask != 0)
1268 rc = smb_node_setattr(sr, node, of->f_cr, of, &attr);
1269
1270 return (rc);
1271 }
1272
1273 /*
1274 * This function is used to delete a newly created object (file or
1275 * directory) if an error occurs after creation of the object.
1276 */
1277 static void
smb_delete_new_object(smb_request_t * sr)1278 smb_delete_new_object(smb_request_t *sr)
1279 {
1280 smb_arg_open_t *op = &sr->sr_open;
1281 smb_fqi_t *fqi = &(op->fqi);
1282 uint32_t flags = 0;
1283
1284 if (SMB_TREE_IS_CASEINSENSITIVE(sr))
1285 flags |= SMB_IGNORE_CASE;
1286 if (SMB_TREE_SUPPORTS_CATIA(sr))
1287 flags |= SMB_CATIA;
1288
1289 if (op->create_options & FILE_DIRECTORY_FILE)
1290 (void) smb_fsop_rmdir(sr, sr->user_cr, fqi->fq_dnode,
1291 fqi->fq_last_comp, flags);
1292 else
1293 (void) smb_fsop_remove(sr, sr->user_cr, fqi->fq_dnode,
1294 fqi->fq_last_comp, flags);
1295 }
1296