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s4-smbtorture: add ndr test for nbt_netlogon_packet to avoid future regressions.
[Samba/gebeck_regimport.git] / source3 / smbd / smb2_read.c
blob08622092c6441fd85e25e935f379b1218b80eb26
1 /*
2 Unix SMB/CIFS implementation.
3 Core SMB2 server
4
5 Copyright (C) Stefan Metzmacher 2009
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "system/filesys.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../libcli/smb/smb_common.h"
26 #include "libcli/security/security.h"
27 #include "../lib/util/tevent_ntstatus.h"
28 #include "rpc_server/srv_pipe_hnd.h"
29
30 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
31 struct tevent_context *ev,
32 struct smbd_smb2_request *smb2req,
33 uint32_t in_smbpid,
34 uint64_t in_file_id_volatile,
35 uint32_t in_length,
36 uint64_t in_offset,
37 uint32_t in_minimum,
38 uint32_t in_remaining);
39 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
40 TALLOC_CTX *mem_ctx,
41 DATA_BLOB *out_data,
42 uint32_t *out_remaining);
43
44 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
45 NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
46 {
47 NTSTATUS status;
48 const uint8_t *inhdr;
49 const uint8_t *inbody;
50 int i = req->current_idx;
51 uint32_t in_smbpid;
52 uint32_t in_length;
53 uint64_t in_offset;
54 uint64_t in_file_id_persistent;
55 uint64_t in_file_id_volatile;
56 uint32_t in_minimum_count;
57 uint32_t in_remaining_bytes;
58 struct tevent_req *subreq;
59
60 status = smbd_smb2_request_verify_sizes(req, 0x31);
61 if (!NT_STATUS_IS_OK(status)) {
62 return smbd_smb2_request_error(req, status);
63 }
64 inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
65 inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
66
67 in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
68
69 in_length = IVAL(inbody, 0x04);
70 in_offset = BVAL(inbody, 0x08);
71 in_file_id_persistent = BVAL(inbody, 0x10);
72 in_file_id_volatile = BVAL(inbody, 0x18);
73 in_minimum_count = IVAL(inbody, 0x20);
74 in_remaining_bytes = IVAL(inbody, 0x28);
75
76 /* check the max read size */
77 if (in_length > req->sconn->smb2.max_read) {
78 DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
79 __location__, in_length, req->sconn->smb2.max_read));
80 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
81 }
82
83 if (req->compat_chain_fsp) {
84 /* skip check */
85 } else if (in_file_id_persistent != in_file_id_volatile) {
86 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
87 }
88
89 subreq = smbd_smb2_read_send(req,
90 req->sconn->smb2.event_ctx,
91 req,
92 in_smbpid,
93 in_file_id_volatile,
94 in_length,
95 in_offset,
96 in_minimum_count,
97 in_remaining_bytes);
98 if (subreq == NULL) {
99 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
100 }
101 tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
102
103 return smbd_smb2_request_pending_queue(req, subreq, 500);
104 }
105
106 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
107 {
108 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
109 struct smbd_smb2_request);
110 int i = req->current_idx;
111 uint8_t *outhdr;
112 DATA_BLOB outbody;
113 DATA_BLOB outdyn;
114 uint8_t out_data_offset;
115 DATA_BLOB out_data_buffer = data_blob_null;
116 uint32_t out_data_remaining = 0;
117 NTSTATUS status;
118 NTSTATUS error; /* transport error */
119
120 status = smbd_smb2_read_recv(subreq,
121 req,
122 &out_data_buffer,
123 &out_data_remaining);
124 TALLOC_FREE(subreq);
125 if (!NT_STATUS_IS_OK(status)) {
126 error = smbd_smb2_request_error(req, status);
127 if (!NT_STATUS_IS_OK(error)) {
128 smbd_server_connection_terminate(req->sconn,
129 nt_errstr(error));
130 return;
131 }
132 return;
133 }
134
135 out_data_offset = SMB2_HDR_BODY + 0x10;
136
137 outhdr = (uint8_t *)req->out.vector[i].iov_base;
138
139 outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
140 if (outbody.data == NULL) {
141 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
142 if (!NT_STATUS_IS_OK(error)) {
143 smbd_server_connection_terminate(req->sconn,
144 nt_errstr(error));
145 return;
146 }
147 return;
148 }
149
150 SSVAL(outbody.data, 0x00, 0x10 + 1); /* struct size */
151 SCVAL(outbody.data, 0x02,
152 out_data_offset); /* data offset */
153 SCVAL(outbody.data, 0x03, 0); /* reserved */
154 SIVAL(outbody.data, 0x04,
155 out_data_buffer.length); /* data length */
156 SIVAL(outbody.data, 0x08,
157 out_data_remaining); /* data remaining */
158 SIVAL(outbody.data, 0x0C, 0); /* reserved */
159
160 outdyn = out_data_buffer;
161
162 error = smbd_smb2_request_done(req, outbody, &outdyn);
163 if (!NT_STATUS_IS_OK(error)) {
164 smbd_server_connection_terminate(req->sconn,
165 nt_errstr(error));
166 return;
167 }
168 }
169
170 struct smbd_smb2_read_state {
171 struct smbd_smb2_request *smb2req;
172 struct smb_request *smbreq;
173 files_struct *fsp;
174 uint64_t in_file_id_volatile;
175 uint32_t in_length;
176 uint64_t in_offset;
177 uint32_t in_minimum;
178 DATA_BLOB out_data;
179 uint32_t out_remaining;
180 };
181
182 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
183 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
184 {
185 struct lock_struct lock;
186 uint32_t in_length = state->in_length;
187 uint64_t in_offset = state->in_offset;
188 files_struct *fsp = state->fsp;
189 ssize_t nread;
190
191 nread = SMB_VFS_SENDFILE(fsp->conn->sconn->sock,
192 fsp,
193 NULL,
194 in_offset,
195 in_length);
196 DEBUG(10,("smb2_sendfile_send_data: SMB_VFS_SENDFILE returned %d on file %s\n",
197 (int)nread,
198 fsp_str_dbg(fsp) ));
199
200 if (nread == -1) {
201 if (errno == ENOSYS || errno == EINTR) {
202 /*
203 * Special hack for broken systems with no working
204 * sendfile. Fake this up by doing read/write calls.
205 */
206 set_use_sendfile(SNUM(fsp->conn), false);
207 nread = fake_sendfile(fsp, in_offset, in_length);
208 if (nread == -1) {
209 DEBUG(0,("smb2_sendfile_send_data: "
210 "fake_sendfile failed for "
211 "file %s (%s).\n",
212 fsp_str_dbg(fsp),
213 strerror(errno)));
214 exit_server_cleanly("smb2_sendfile_send_data: "
215 "fake_sendfile failed");
216 }
217 goto out;
218 }
219
220 DEBUG(0,("smb2_sendfile_send_data: sendfile failed for file "
221 "%s (%s). Terminating\n",
222 fsp_str_dbg(fsp),
223 strerror(errno)));
224 exit_server_cleanly("smb2_sendfile_send_data: sendfile failed");
225 } else if (nread == 0) {
226 /*
227 * Some sendfile implementations return 0 to indicate
228 * that there was a short read, but nothing was
229 * actually written to the socket. In this case,
230 * fallback to the normal read path so the header gets
231 * the correct byte count.
232 */
233 DEBUG(3, ("send_file_readX: sendfile sent zero bytes "
234 "falling back to the normal read: %s\n",
235 fsp_str_dbg(fsp)));
236
237 nread = fake_sendfile(fsp, in_offset, in_length);
238 if (nread == -1) {
239 DEBUG(0,("smb2_sendfile_send_data: "
240 "fake_sendfile failed for file "
241 "%s (%s). Terminating\n",
242 fsp_str_dbg(fsp),
243 strerror(errno)));
244 exit_server_cleanly("smb2_sendfile_send_data: "
245 "fake_sendfile failed");
246 }
247 }
248
249 out:
250
251 if (nread < in_length) {
252 sendfile_short_send(fsp, nread, 0, in_length);
253 }
254
255 init_strict_lock_struct(fsp,
256 state->in_file_id_volatile,
257 in_offset,
258 in_length,
259 READ_LOCK,
260 &lock);
261
262 SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lock);
263 return 0;
264 }
265
266 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
267 struct smbd_smb2_read_state *state)
268 {
269 struct smbd_smb2_read_state *state_copy = NULL;
270 files_struct *fsp = state->fsp;
271
272 /*
273 * We cannot use sendfile if...
274 * We were not configured to do so OR
275 * Signing is active OR
276 * This is a compound SMB2 operation OR
277 * fsp is a STREAM file OR
278 * We're using a write cache OR
279 * It's not a regular file OR
280 * Requested offset is greater than file size OR
281 * there's not enough data in the file.
282 * Phew :-). Luckily this means most
283 * reads on most normal files. JRA.
284 */
285
286 if (!lp__use_sendfile(SNUM(fsp->conn)) ||
287 smb2req->do_signing ||
288 smb2req->in.vector_count != 4 ||
289 (fsp->base_fsp != NULL) ||
290 (fsp->wcp != NULL) ||
291 (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
292 (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
293 (fsp->fsp_name->st.st_ex_size < state->in_offset +
294 state->in_length)) {
295 return NT_STATUS_RETRY;
296 }
297
298 /* We've already checked there's this amount of data
299 to read. */
300 state->out_data.length = state->in_length;
301 state->out_remaining = 0;
302
303 /* Make a copy of state attached to the smb2req. Attach
304 the destructor here as this will trigger the sendfile
305 call when the request is destroyed. */
306 state_copy = talloc(smb2req, struct smbd_smb2_read_state);
307 if (!state_copy) {
308 return NT_STATUS_NO_MEMORY;
309 }
310 *state_copy = *state;
311 talloc_set_destructor(state_copy, smb2_sendfile_send_data);
312 return NT_STATUS_OK;
313 }
314
315 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
316
317 /*******************************************************************
318 Common read complete processing function for both synchronous and
319 asynchronous reads.
320 *******************************************************************/
321
322 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
323 {
324 struct smbd_smb2_read_state *state = tevent_req_data(req,
325 struct smbd_smb2_read_state);
326 files_struct *fsp = state->fsp;
327
328 if (nread < 0) {
329 NTSTATUS status = map_nt_error_from_unix(err);
330
331 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
332 "Error = %s (NTSTATUS %s)\n",
333 fsp_str_dbg(fsp),
334 (int)nread,
335 strerror(err),
336 nt_errstr(status)));
337
338 return status;
339 }
340 if (nread == 0 && state->in_length != 0) {
341 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
342 fsp_str_dbg(fsp)));
343 return NT_STATUS_END_OF_FILE;
344 }
345
346 if (nread < state->in_minimum) {
347 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
348 "minimum requested %u. Returning end of file\n",
349 fsp_str_dbg(fsp),
350 (int)nread,
351 (unsigned int)state->in_minimum));
352 return NT_STATUS_END_OF_FILE;
353 }
354
355 DEBUG(3,("smbd_smb2_read: fnum=[%d/%s] length=%lu offset=%lu read=%lu\n",
356 fsp->fnum,
357 fsp_str_dbg(fsp),
358 (unsigned long)state->in_length,
359 (unsigned long)state->in_offset,
360 (unsigned long)nread));
361
362 state->out_data.length = nread;
363 state->out_remaining = 0;
364
365 return NT_STATUS_OK;
366 }
367
368 static bool smbd_smb2_read_cancel(struct tevent_req *req)
369 {
370 struct smbd_smb2_read_state *state =
371 tevent_req_data(req,
372 struct smbd_smb2_read_state);
373
374 state->smb2req->cancelled = true;
375
376 return cancel_smb2_aio(state->smbreq);
377 }
378
379 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
380 struct tevent_context *ev,
381 struct smbd_smb2_request *smb2req,
382 uint32_t in_smbpid,
383 uint64_t in_file_id_volatile,
384 uint32_t in_length,
385 uint64_t in_offset,
386 uint32_t in_minimum,
387 uint32_t in_remaining)
388 {
389 NTSTATUS status;
390 struct tevent_req *req = NULL;
391 struct smbd_smb2_read_state *state = NULL;
392 struct smb_request *smbreq = NULL;
393 connection_struct *conn = smb2req->tcon->compat_conn;
394 files_struct *fsp = NULL;
395 ssize_t nread = -1;
396 struct lock_struct lock;
397 int saved_errno;
398
399 req = tevent_req_create(mem_ctx, &state,
400 struct smbd_smb2_read_state);
401 if (req == NULL) {
402 return NULL;
403 }
404 state->smb2req = smb2req;
405 state->in_length = in_length;
406 state->in_offset = in_offset;
407 state->in_minimum = in_minimum;
408 state->out_data = data_blob_null;
409 state->out_remaining = 0;
410
411 DEBUG(10,("smbd_smb2_read: file_id[0x%016llX]\n",
412 (unsigned long long)in_file_id_volatile));
413
414 smbreq = smbd_smb2_fake_smb_request(smb2req);
415 if (tevent_req_nomem(smbreq, req)) {
416 return tevent_req_post(req, ev);
417 }
418 state->smbreq = smbreq;
419
420 fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
421 if (fsp == NULL) {
422 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
423 return tevent_req_post(req, ev);
424 }
425 if (conn != fsp->conn) {
426 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
427 return tevent_req_post(req, ev);
428 }
429 if (smb2req->session->vuid != fsp->vuid) {
430 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
431 return tevent_req_post(req, ev);
432 }
433 if (fsp->is_directory) {
434 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
435 return tevent_req_post(req, ev);
436 }
437
438 state->fsp = fsp;
439 state->in_file_id_volatile = in_file_id_volatile;
440
441 if (IS_IPC(smbreq->conn)) {
442 struct tevent_req *subreq = NULL;
443
444 state->out_data = data_blob_talloc(state, NULL, in_length);
445 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
446 return tevent_req_post(req, ev);
447 }
448
449 if (!fsp_is_np(fsp)) {
450 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
451 return tevent_req_post(req, ev);
452 }
453
454 subreq = np_read_send(state, server_event_context(),
455 fsp->fake_file_handle,
456 state->out_data.data,
457 state->out_data.length);
458 if (tevent_req_nomem(subreq, req)) {
459 return tevent_req_post(req, ev);
460 }
461 tevent_req_set_callback(subreq,
462 smbd_smb2_read_pipe_done,
463 req);
464 return req;
465 }
466
467 if (!CHECK_READ(fsp, smbreq)) {
468 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
469 return tevent_req_post(req, ev);
470 }
471
472 status = schedule_smb2_aio_read(fsp->conn,
473 smbreq,
474 fsp,
475 state,
476 &state->out_data,
477 (SMB_OFF_T)in_offset,
478 (size_t)in_length);
479
480 if (NT_STATUS_IS_OK(status)) {
481 /*
482 * Doing an async read, allow this
483 * request to be canceled
484 */
485 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
486 return req;
487 }
488
489 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
490 /* Real error in setting up aio. Fail. */
491 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
492 return tevent_req_post(req, ev);
493 }
494
495 /* Fallback to synchronous. */
496
497 init_strict_lock_struct(fsp,
498 in_file_id_volatile,
499 in_offset,
500 in_length,
501 READ_LOCK,
502 &lock);
503
504 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
505 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
506 return tevent_req_post(req, ev);
507 }
508
509 /* Try sendfile in preference. */
510 status = schedule_smb2_sendfile_read(smb2req, state);
511 if (NT_STATUS_IS_OK(status)) {
512 tevent_req_done(req);
513 return tevent_req_post(req, ev);
514 } else {
515 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
516 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
517 tevent_req_nterror(req, status);
518 return tevent_req_post(req, ev);
519 }
520 }
521
522 /* Ok, read into memory. Allocate the out buffer. */
523 state->out_data = data_blob_talloc(state, NULL, in_length);
524 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
525 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
526 return tevent_req_post(req, ev);
527 }
528
529 nread = read_file(fsp,
530 (char *)state->out_data.data,
531 in_offset,
532 in_length);
533
534 saved_errno = errno;
535
536 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
537
538 DEBUG(10,("smbd_smb2_read: file %s handle [0x%016llX] offset=%llu "
539 "len=%llu returned %lld\n",
540 fsp_str_dbg(fsp),
541 (unsigned long long)in_file_id_volatile,
542 (unsigned long long)in_offset,
543 (unsigned long long)in_length,
544 (long long)nread));
545
546 status = smb2_read_complete(req, nread, saved_errno);
547 if (!NT_STATUS_IS_OK(status)) {
548 tevent_req_nterror(req, status);
549 } else {
550 /* Success. */
551 tevent_req_done(req);
552 }
553 return tevent_req_post(req, ev);
554 }
555
556 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
557 {
558 struct tevent_req *req = tevent_req_callback_data(subreq,
559 struct tevent_req);
560 struct smbd_smb2_read_state *state = tevent_req_data(req,
561 struct smbd_smb2_read_state);
562 NTSTATUS status;
563 ssize_t nread = -1;
564 bool is_data_outstanding;
565
566 status = np_read_recv(subreq, &nread, &is_data_outstanding);
567 TALLOC_FREE(subreq);
568 if (!NT_STATUS_IS_OK(status)) {
569 tevent_req_nterror(req, status);
570 return;
571 }
572
573 if (nread == 0 && state->out_data.length != 0) {
574 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
575 return;
576 }
577
578 state->out_data.length = nread;
579 state->out_remaining = 0;
580
581 /*
582 * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
583 * handle it in SMB1 pipe_read_andx_done().
584 */
585
586 tevent_req_done(req);
587 }
588
589 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
590 TALLOC_CTX *mem_ctx,
591 DATA_BLOB *out_data,
592 uint32_t *out_remaining)
593 {
594 NTSTATUS status;
595 struct smbd_smb2_read_state *state = tevent_req_data(req,
596 struct smbd_smb2_read_state);
597
598 if (tevent_req_is_nterror(req, &status)) {
599 tevent_req_received(req);
600 return status;
601 }
602
603 *out_data = state->out_data;
604 talloc_steal(mem_ctx, out_data->data);
605 *out_remaining = state->out_remaining;
606
607 tevent_req_received(req);
608 return NT_STATUS_OK;
609 }
reg import