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 2017 Nexenta Systems, Inc. All rights reserved.
25 */
26
27 #include <sys/sdt.h>
28 #include <smbsrv/smb_kproto.h>
29 #include <smbsrv/smb_fsops.h>
30 #include <smbsrv/netbios.h>
31
32
33 static int smb_write_truncate(smb_request_t *, smb_rw_param_t *);
34
35
36 /*
37 * Write count bytes at the specified offset in a file. The offset is
38 * limited to 32-bits. If the count is zero, the file is truncated to
39 * the length specified by the offset.
40 *
41 * The response count indicates the actual number of bytes written, which
42 * will equal the requested count on success. If request and response
43 * counts differ but there is no error, the client will assume that the
44 * server encountered a resource issue.
45 */
46 smb_sdrc_t
47 smb_pre_write(smb_request_t *sr)
48 {
49 smb_rw_param_t *param;
50 uint32_t off;
51 uint16_t count;
52 int rc;
53
54 param = kmem_zalloc(sizeof (smb_rw_param_t), KM_SLEEP);
55 sr->arg.rw = param;
56 param->rw_magic = SMB_RW_MAGIC;
57
58 rc = smbsr_decode_vwv(sr, "wwl", &sr->smb_fid, &count, &off);
59
60 param->rw_count = (uint32_t)count;
61 param->rw_offset = (uint64_t)off;
62 param->rw_vdb.vdb_uio.uio_loffset = (offset_t)param->rw_offset;
63
64 DTRACE_SMB_START(op__Write, smb_request_t *, sr); /* arg.rw */
65
66 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
67 }
68
69 void
70 smb_post_write(smb_request_t *sr)
71 {
72 DTRACE_SMB_DONE(op__Write, smb_request_t *, sr); /* arg.rw */
73
74 kmem_free(sr->arg.rw, sizeof (smb_rw_param_t));
75 }
76
77 smb_sdrc_t
78 smb_com_write(smb_request_t *sr)
79 {
80 smb_rw_param_t *param = sr->arg.rw;
81 int rc;
82
83 smbsr_lookup_file(sr);
84 if (sr->fid_ofile == NULL) {
85 smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
86 return (SDRC_ERROR);
87 }
88
89 sr->user_cr = smb_ofile_getcred(sr->fid_ofile);
90
91 if (param->rw_count == 0) {
92 rc = smb_write_truncate(sr, param);
93 } else {
94 rc = smbsr_decode_data(sr, "D", ¶m->rw_vdb);
95
96 if ((rc != 0) || (param->rw_vdb.vdb_len != param->rw_count)) {
97 smbsr_error(sr, NT_STATUS_INVALID_PARAMETER,
98 ERRDOS, ERROR_INVALID_PARAMETER);
99 return (SDRC_ERROR);
100 }
101
102 param->rw_vdb.vdb_uio.uio_loffset = (offset_t)param->rw_offset;
103
104 rc = smb_common_write(sr, param);
105 }
106
107 if (rc != 0) {
108 if (sr->smb_error.status != NT_STATUS_FILE_LOCK_CONFLICT)
109 smbsr_errno(sr, rc);
110 return (SDRC_ERROR);
111 }
112
113 rc = smbsr_encode_result(sr, 1, 0, "bww", 1,
114 (uint16_t)param->rw_count, 0);
115 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
116 }
117
118 /*
119 * Write count bytes to a file and then close the file. This function
120 * can only be used to write to 32-bit offsets and the client must set
121 * WordCount (6 or 12) correctly in order to locate the data to be
122 * written. If an error occurs on the write, the file should still be
123 * closed. If Count is 0, the file is truncated (or extended) to offset.
124 *
125 * If the last_write time is non-zero, last_write should be used to set
126 * the mtime. Otherwise the file system stamps the mtime. Failure to
127 * set mtime should not result in an error response.
128 */
129 smb_sdrc_t
130 smb_pre_write_and_close(smb_request_t *sr)
131 {
132 smb_rw_param_t *param;
133 uint32_t off;
134 uint16_t count;
135 int rc;
136
137 param = kmem_zalloc(sizeof (smb_rw_param_t), KM_SLEEP);
138 sr->arg.rw = param;
139 param->rw_magic = SMB_RW_MAGIC;
140
141 if (sr->smb_wct == 12) {
142 rc = smbsr_decode_vwv(sr, "wwll12.", &sr->smb_fid,
143 &count, &off, ¶m->rw_last_write);
144 } else {
145 rc = smbsr_decode_vwv(sr, "wwll", &sr->smb_fid,
146 &count, &off, ¶m->rw_last_write);
147 }
148
149 param->rw_count = (uint32_t)count;
150 param->rw_offset = (uint64_t)off;
151
152 DTRACE_SMB_START(op__WriteAndClose, smb_request_t *, sr); /* arg.rw */
153
154 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
155 }
156
157 void
158 smb_post_write_and_close(smb_request_t *sr)
159 {
160 DTRACE_SMB_DONE(op__WriteAndClose, smb_request_t *, sr); /* arg.rw */
161
162 kmem_free(sr->arg.rw, sizeof (smb_rw_param_t));
163 }
164
165 smb_sdrc_t
166 smb_com_write_and_close(smb_request_t *sr)
167 {
168 smb_rw_param_t *param = sr->arg.rw;
169 uint16_t count;
170 int rc = 0;
171
172 smbsr_lookup_file(sr);
173 if (sr->fid_ofile == NULL) {
174 smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
175 return (SDRC_ERROR);
176 }
177
178 sr->user_cr = smb_ofile_getcred(sr->fid_ofile);
179
180 if (param->rw_count == 0) {
181 rc = smb_write_truncate(sr, param);
182 } else {
183 /*
184 * There may be a bug here: should this be "3.#B"?
185 */
186 rc = smbsr_decode_data(sr, ".#B", param->rw_count,
187 ¶m->rw_vdb);
188
189 if ((rc != 0) || (param->rw_vdb.vdb_len != param->rw_count)) {
190 smbsr_error(sr, NT_STATUS_INVALID_PARAMETER,
191 ERRDOS, ERROR_INVALID_PARAMETER);
192 return (SDRC_ERROR);
193 }
194
195 param->rw_vdb.vdb_uio.uio_loffset = (offset_t)param->rw_offset;
196
197 rc = smb_common_write(sr, param);
198 }
199
200 if (rc != 0) {
201 if (sr->smb_error.status != NT_STATUS_FILE_LOCK_CONFLICT)
202 smbsr_errno(sr, rc);
203 return (SDRC_ERROR);
204 }
205
206 smb_ofile_close(sr->fid_ofile, param->rw_last_write);
207
208 count = (uint16_t)param->rw_count;
209 rc = smbsr_encode_result(sr, 1, 0, "bww", 1, count, 0);
210 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
211 }
212
213 /*
214 * Write count bytes to a file at the specified offset and then unlock
215 * them. Write behind is safe because the client should have the range
216 * locked and this request is allowed to extend the file - note that
217 * offset is limited to 32-bits.
218 *
219 * Spec advice: it is an error for count to be zero. For compatibility,
220 * we take no action and return success.
221 *
222 * The SmbLockAndRead/SmbWriteAndUnlock sub-dialect is only valid on disk
223 * files. Reject any attempt to use it on other shares.
224 *
225 * The response count indicates the actual number of bytes written, which
226 * will equal the requested count on success. If request and response
227 * counts differ but there is no error, the client will assume that the
228 * server encountered a resource issue.
229 */
230 smb_sdrc_t
231 smb_pre_write_and_unlock(smb_request_t *sr)
232 {
233 smb_rw_param_t *param;
234 uint32_t off;
235 uint16_t count;
236 uint16_t remcnt;
237 int rc;
238
239 param = kmem_zalloc(sizeof (smb_rw_param_t), KM_SLEEP);
240 sr->arg.rw = param;
241 param->rw_magic = SMB_RW_MAGIC;
242
243 rc = smbsr_decode_vwv(sr, "wwlw", &sr->smb_fid, &count, &off, &remcnt);
244
245 param->rw_count = (uint32_t)count;
246 param->rw_offset = (uint64_t)off;
247
248 DTRACE_SMB_START(op__WriteAndUnlock, smb_request_t *, sr); /* arg.rw */
249
250 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
251 }
252
253 void
254 smb_post_write_and_unlock(smb_request_t *sr)
255 {
256 DTRACE_SMB_DONE(op__WriteAndUnlock, smb_request_t *, sr); /* arg.rw */
257
258 kmem_free(sr->arg.rw, sizeof (smb_rw_param_t));
259 }
260
261 smb_sdrc_t
262 smb_com_write_and_unlock(smb_request_t *sr)
263 {
264 smb_rw_param_t *param = sr->arg.rw;
265 uint32_t lk_pid;
266 uint32_t status;
267 int rc = 0;
268
269 if (STYPE_ISDSK(sr->tid_tree->t_res_type) == 0) {
270 smbsr_error(sr, NT_STATUS_ACCESS_DENIED, ERRDOS, ERRnoaccess);
271 return (SDRC_ERROR);
272 }
273
274 smbsr_lookup_file(sr);
275 if (sr->fid_ofile == NULL) {
276 smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
277 return (SDRC_ERROR);
278 }
279
280 sr->user_cr = smb_ofile_getcred(sr->fid_ofile);
281
282 if (param->rw_count == 0) {
283 rc = smbsr_encode_result(sr, 1, 0, "bww", 1, 0, 0);
284 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
285 }
286
287
288 rc = smbsr_decode_data(sr, "D", ¶m->rw_vdb);
289
290 if ((rc != 0) || (param->rw_count != param->rw_vdb.vdb_len)) {
291 smbsr_error(sr, NT_STATUS_INVALID_PARAMETER,
292 ERRDOS, ERROR_INVALID_PARAMETER);
293 return (SDRC_ERROR);
294 }
295
296 param->rw_vdb.vdb_uio.uio_loffset = (offset_t)param->rw_offset;
297
298 if ((rc = smb_common_write(sr, param)) != 0) {
299 if (sr->smb_error.status != NT_STATUS_FILE_LOCK_CONFLICT)
300 smbsr_errno(sr, rc);
301 return (SDRC_ERROR);
302 }
303
304
305 /* Note: SMB1 locking uses 16-bit PIDs. */
306 lk_pid = sr->smb_pid & 0xFFFF;
307
308 status = smb_unlock_range(sr, param->rw_offset,
309 (uint64_t)param->rw_count, lk_pid);
310 if (status != NT_STATUS_SUCCESS) {
311 smbsr_error(sr, NT_STATUS_RANGE_NOT_LOCKED,
312 ERRDOS, ERROR_NOT_LOCKED);
313 return (SDRC_ERROR);
314 }
315
316 rc = smbsr_encode_result(sr, 1, 0, "bww", 1,
317 (uint16_t)param->rw_count, 0);
318 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
319 }
320
321 /*
322 * The SMB_COM_WRITE_RAW protocol was a negotiated option introduced in
323 * SMB Core Plus to maximize performance when writing a large block
324 * of data to a server. It's obsolete and no longer supported.
325 *
326 * We keep a handler for it so the dtrace provider can see if
327 * the client tried to use this command.
328 */
329 smb_sdrc_t
330 smb_pre_write_raw(smb_request_t *sr)
331 {
332 DTRACE_SMB_START(op__WriteRaw, smb_request_t *, sr);
333 return (SDRC_SUCCESS);
334 }
335
336 void
337 smb_post_write_raw(smb_request_t *sr)
338 {
339 DTRACE_SMB_DONE(op__WriteRaw, smb_request_t *, sr);
340 }
341
342 smb_sdrc_t
343 smb_com_write_raw(struct smb_request *sr)
344 {
345 smbsr_error(sr, NT_STATUS_NOT_SUPPORTED, ERRDOS,
346 ERROR_NOT_SUPPORTED);
347 return (SDRC_ERROR);
348 }
349
350 /*
351 * Write bytes to a file (SMB Core). This request was extended in
352 * LM 0.12 to support 64-bit offsets, indicated by sending a wct of
353 * 14, instead of 12, and including additional offset information.
354 *
355 * A ByteCount of 0 does not truncate the file - use SMB_COM_WRITE
356 * to truncate a file. A zero length merely transfers zero bytes.
357 *
358 * If bit 0 of WriteMode is set, Fid must refer to a disk file and
359 * the data must be on stable storage before responding.
360 *
361 * MS-SMB 3.3.5.8 update to LM 0.12 4.2.5:
362 * If CAP_LARGE_WRITEX is set, the byte count may be larger than the
363 * negotiated buffer size and the server is expected to write the
364 * number of bytes specified.
365 */
366 smb_sdrc_t
367 smb_pre_write_andx(smb_request_t *sr)
368 {
369 smb_rw_param_t *param;
370 uint32_t off_low;
371 uint32_t off_high;
372 uint16_t datalen_low;
373 uint16_t datalen_high;
374 uint16_t remcnt;
375 int rc;
376
377 param = kmem_zalloc(sizeof (smb_rw_param_t), KM_SLEEP);
378 sr->arg.rw = param;
379 param->rw_magic = SMB_RW_MAGIC;
380
381 if (sr->smb_wct == 14) {
382 rc = smbsr_decode_vwv(sr, "4.wl4.wwwwwl", &sr->smb_fid,
383 &off_low, ¶m->rw_mode, &remcnt, &datalen_high,
384 &datalen_low, ¶m->rw_dsoff, &off_high);
385
386 if (param->rw_dsoff >= 63)
387 param->rw_dsoff -= 63;
388 param->rw_offset = ((uint64_t)off_high << 32) | off_low;
389 } else if (sr->smb_wct == 12) {
390 rc = smbsr_decode_vwv(sr, "4.wl4.wwwww", &sr->smb_fid,
391 &off_low, ¶m->rw_mode, &remcnt, &datalen_high,
392 &datalen_low, ¶m->rw_dsoff);
393
394 if (param->rw_dsoff >= 59)
395 param->rw_dsoff -= 59;
396 param->rw_offset = (uint64_t)off_low;
397 /* off_high not present */
398 } else {
399 rc = -1;
400 }
401
402 param->rw_count = (uint32_t)datalen_low;
403
404 /*
405 * Work-around a Win7 bug, where it fails to set the
406 * CAP_LARGE_WRITEX flag during session setup. Assume
407 * a large write if the data remaining is >= 64k.
408 */
409 if ((sr->session->capabilities & CAP_LARGE_WRITEX) != 0 ||
410 (sr->smb_data.max_bytes > (sr->smb_data.chain_offset + 0xFFFF)))
411 param->rw_count |= ((uint32_t)datalen_high << 16);
412
413 DTRACE_SMB_START(op__WriteX, smb_request_t *, sr); /* arg.rw */
414
415 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
416 }
417
418 void
419 smb_post_write_andx(smb_request_t *sr)
420 {
421 DTRACE_SMB_DONE(op__WriteX, smb_request_t *, sr); /* arg.rw */
422
423 kmem_free(sr->arg.rw, sizeof (smb_rw_param_t));
424 }
425
426 smb_sdrc_t
427 smb_com_write_andx(smb_request_t *sr)
428 {
429 smb_rw_param_t *param = sr->arg.rw;
430 uint16_t count_high;
431 uint16_t count_low;
432 int rc;
433
434 ASSERT(param);
435 ASSERT(param->rw_magic == SMB_RW_MAGIC);
436
437 smbsr_lookup_file(sr);
438 if (sr->fid_ofile == NULL) {
439 smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
440 return (SDRC_ERROR);
441 }
442
443 sr->user_cr = smb_ofile_getcred(sr->fid_ofile);
444
445 if (SMB_WRMODE_IS_STABLE(param->rw_mode) &&
446 STYPE_ISIPC(sr->tid_tree->t_res_type)) {
447 smbsr_error(sr, 0, ERRSRV, ERRaccess);
448 return (SDRC_ERROR);
449 }
450
451 rc = smbsr_decode_data(sr, "#.#B", param->rw_dsoff, param->rw_count,
452 ¶m->rw_vdb);
453
454 if ((rc != 0) || (param->rw_vdb.vdb_len != param->rw_count)) {
455 smbsr_error(sr, NT_STATUS_INVALID_PARAMETER,
456 ERRDOS, ERROR_INVALID_PARAMETER);
457 return (SDRC_ERROR);
458 }
459
460 param->rw_vdb.vdb_uio.uio_loffset = (offset_t)param->rw_offset;
461
462 if (param->rw_count != 0) {
463 if ((rc = smb_common_write(sr, param)) != 0) {
464 if (sr->smb_error.status !=
465 NT_STATUS_FILE_LOCK_CONFLICT)
466 smbsr_errno(sr, rc);
467 return (SDRC_ERROR);
468 }
469 }
470
471 count_low = param->rw_count & 0xFFFF;
472 count_high = (param->rw_count >> 16) & 0xFF;
473
474 rc = smbsr_encode_result(sr, 6, 0, "bb1.wwwwww",
475 6, sr->andx_com, 15, count_low, 0, count_high, 0, 0);
476
477 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
478 }
479
480 /*
481 * Common function for writing files or IPC/MSRPC named pipes.
482 *
483 * Returns errno values.
484 */
485 int
486 smb_common_write(smb_request_t *sr, smb_rw_param_t *param)
487 {
488 smb_ofile_t *ofile = sr->fid_ofile;
489 smb_node_t *node;
490 int stability = 0;
491 uint32_t lcount;
492 int rc = 0;
493
494 switch (sr->tid_tree->t_res_type & STYPE_MASK) {
495 case STYPE_DISKTREE:
496 case STYPE_PRINTQ:
497 node = ofile->f_node;
498
499 if (!smb_node_is_dir(node)) {
500 rc = smb_lock_range_access(sr, node, param->rw_offset,
501 param->rw_count, B_TRUE);
502 if (rc != NT_STATUS_SUCCESS) {
503 smbsr_error(sr, NT_STATUS_FILE_LOCK_CONFLICT,
504 ERRDOS, ERROR_LOCK_VIOLATION);
505 return (EACCES);
506 }
507 }
508
509 if (SMB_WRMODE_IS_STABLE(param->rw_mode) ||
510 (node->flags & NODE_FLAGS_WRITE_THROUGH)) {
511 stability = FSYNC;
512 }
513
514 rc = smb_fsop_write(sr, sr->user_cr, node, ofile,
515 ¶m->rw_vdb.vdb_uio, &lcount, stability);
516
517 if (rc)
518 return (rc);
519
520 /*
521 * Used to have code here to set mtime.
522 * We have just done a write, so we know
523 * the file system will update mtime.
524 * No need to do it again here.
525 *
526 * However, keep track of the fact that
527 * we have written data via this handle.
528 */
529 ofile->f_written = B_TRUE;
530
531 /* This revokes read cache delegations. */
532 (void) smb_oplock_break_WRITE(node, ofile);
533
534 param->rw_count = lcount;
535 break;
536
537 case STYPE_IPC:
538 param->rw_count = param->rw_vdb.vdb_uio.uio_resid;
539
540 if ((rc = smb_opipe_write(sr, ¶m->rw_vdb.vdb_uio)) != 0)
541 param->rw_count = 0;
542 break;
543
544 default:
545 rc = EACCES;
546 break;
547 }
548
549 if (rc != 0)
550 return (rc);
551
552 mutex_enter(&ofile->f_mutex);
553 ofile->f_seek_pos = param->rw_offset + param->rw_count;
554 mutex_exit(&ofile->f_mutex);
555 return (rc);
556 }
557
558 /*
559 * Truncate a disk file to the specified offset.
560 * Typically, w_count will be zero here.
561 *
562 * Note that smb_write_andx cannot be used to reduce the file size so,
563 * if this is required, smb_write is called with a count of zero and
564 * the appropriate file length in offset. The file should be resized
565 * to the length specified by the offset.
566 *
567 * Returns errno values.
568 */
569 static int
570 smb_write_truncate(smb_request_t *sr, smb_rw_param_t *param)
571 {
572 smb_ofile_t *ofile = sr->fid_ofile;
573 smb_node_t *node = ofile->f_node;
574 smb_attr_t attr;
575 uint32_t status;
576 int rc;
577
578 if (STYPE_ISIPC(sr->tid_tree->t_res_type))
579 return (0);
580
581 mutex_enter(&node->n_mutex);
582 if (!smb_node_is_dir(node)) {
583 status = smb_lock_range_access(sr, node, param->rw_offset,
584 param->rw_count, B_TRUE);
585 if (status != NT_STATUS_SUCCESS) {
586 mutex_exit(&node->n_mutex);
587 smbsr_error(sr, NT_STATUS_FILE_LOCK_CONFLICT,
588 ERRDOS, ERROR_LOCK_VIOLATION);
589 return (EACCES);
590 }
591 }
592 mutex_exit(&node->n_mutex);
593
594 bzero(&attr, sizeof (smb_attr_t));
595 attr.sa_mask = SMB_AT_SIZE;
596 attr.sa_vattr.va_size = param->rw_offset;
597 rc = smb_node_setattr(sr, node, sr->user_cr, ofile, &attr);
598 if (rc != 0)
599 return (rc);
600
601 mutex_enter(&ofile->f_mutex);
602 ofile->f_seek_pos = param->rw_offset + param->rw_count;
603 mutex_exit(&ofile->f_mutex);
604 return (0);
605 }