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s3/docs: Fix typo.
[Samba/gebeck_regimport.git] / source3 / smbd / smb2_server.c
blob101ccc951a408df64d766a71794c54fdfaa81f3f
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 "smbd/globals.h"
23 #include "../source4/libcli/smb2/smb2_constants.h"
24 #include "../lib/tsocket/tsocket.h"
25
26 bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size)
27 {
28 if (size < (4 + SMB2_HDR_BODY)) {
29 return false;
30 }
31
32 if (IVAL(inbuf, 4) != SMB2_MAGIC) {
33 return false;
34 }
35
36 return true;
37 }
38
39 static NTSTATUS smbd_initialize_smb2(struct smbd_server_connection *conn)
40 {
41 NTSTATUS status;
42 int ret;
43
44 TALLOC_FREE(conn->smb1.fde);
45
46 conn->smb2.event_ctx = smbd_event_context();
47
48 conn->smb2.recv_queue = tevent_queue_create(conn, "smb2 recv queue");
49 if (conn->smb2.recv_queue == NULL) {
50 return NT_STATUS_NO_MEMORY;
51 }
52
53 conn->smb2.send_queue = tevent_queue_create(conn, "smb2 send queue");
54 if (conn->smb2.send_queue == NULL) {
55 return NT_STATUS_NO_MEMORY;
56 }
57
58 conn->smb2.sessions.idtree = idr_init(conn);
59 if (conn->smb2.sessions.idtree == NULL) {
60 return NT_STATUS_NO_MEMORY;
61 }
62 conn->smb2.sessions.limit = 0x0000FFFE;
63 conn->smb2.sessions.list = NULL;
64
65 ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
66 &conn->smb2.stream);
67 if (ret == -1) {
68 status = map_nt_error_from_unix(errno);
69 return status;
70 }
71
72 /* Ensure child is set to non-blocking mode */
73 set_blocking(smbd_server_fd(),false);
74 return NT_STATUS_OK;
75 }
76
77 #define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
78 #define _smb2_setlen(_buf,len) do { \
79 uint8_t *buf = (uint8_t *)_buf; \
80 buf[0] = 0; \
81 buf[1] = ((len)&0xFF0000)>>16; \
82 buf[2] = ((len)&0xFF00)>>8; \
83 buf[3] = (len)&0xFF; \
84 } while (0)
85
86 static void smb2_setup_nbt_length(struct iovec *vector, int count)
87 {
88 size_t len = 0;
89 int i;
90
91 for (i=1; i < count; i++) {
92 len += vector[i].iov_len;
93 }
94
95 _smb2_setlen(vector[0].iov_base, len);
96 }
97
98 static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
99 const uint8_t *inbuf, size_t size,
100 struct smbd_smb2_request **_req)
101 {
102 TALLOC_CTX *mem_pool;
103 struct smbd_smb2_request *req;
104 uint32_t protocol_version;
105 const uint8_t *inhdr = NULL;
106 off_t ofs = 0;
107 uint16_t cmd;
108 uint32_t next_command_ofs;
109
110 if (size < (4 + SMB2_HDR_BODY + 2)) {
111 DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
112 return NT_STATUS_INVALID_PARAMETER;
113 }
114
115 inhdr = inbuf + 4;
116
117 protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
118 if (protocol_version != SMB2_MAGIC) {
119 DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
120 protocol_version));
121 return NT_STATUS_INVALID_PARAMETER;
122 }
123
124 cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
125 if (cmd != SMB2_OP_NEGPROT) {
126 DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
127 cmd));
128 return NT_STATUS_INVALID_PARAMETER;
129 }
130
131 next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
132 if (next_command_ofs != 0) {
133 DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
134 next_command_ofs));
135 return NT_STATUS_INVALID_PARAMETER;
136 }
137
138 mem_pool = talloc_pool(conn, 8192);
139 if (mem_pool == NULL) {
140 return NT_STATUS_NO_MEMORY;
141 }
142
143 req = talloc_zero(mem_pool, struct smbd_smb2_request);
144 if (req == NULL) {
145 talloc_free(mem_pool);
146 return NT_STATUS_NO_MEMORY;
147 }
148 req->mem_pool = mem_pool;
149 req->conn = conn;
150
151 talloc_steal(req, inbuf);
152
153 req->in.vector = talloc_array(req, struct iovec, 4);
154 if (req->in.vector == NULL) {
155 talloc_free(mem_pool);
156 return NT_STATUS_NO_MEMORY;
157 }
158 req->in.vector_count = 4;
159
160 memcpy(req->in.nbt_hdr, inbuf, 4);
161
162 ofs = 0;
163 req->in.vector[0].iov_base = (void *)req->in.nbt_hdr;
164 req->in.vector[0].iov_len = 4;
165 ofs += req->in.vector[0].iov_len;
166
167 req->in.vector[1].iov_base = (void *)(inbuf + ofs);
168 req->in.vector[1].iov_len = SMB2_HDR_BODY;
169 ofs += req->in.vector[1].iov_len;
170
171 req->in.vector[2].iov_base = (void *)(inbuf + ofs);
172 req->in.vector[2].iov_len = SVAL(inbuf, ofs) & 0xFFFE;
173 ofs += req->in.vector[2].iov_len;
174
175 if (ofs > size) {
176 return NT_STATUS_INVALID_PARAMETER;
177 }
178
179 req->in.vector[3].iov_base = (void *)(inbuf + ofs);
180 req->in.vector[3].iov_len = size - ofs;
181 ofs += req->in.vector[3].iov_len;
182
183 req->current_idx = 1;
184
185 *_req = req;
186 return NT_STATUS_OK;
187 }
188
189 static NTSTATUS smbd_smb2_request_validate(struct smbd_smb2_request *req)
190 {
191 int count;
192 int idx;
193 bool compound_related = false;
194
195 count = req->in.vector_count;
196
197 if (count < 4) {
198 /* It's not a SMB2 request */
199 return NT_STATUS_INVALID_PARAMETER;
200 }
201
202 for (idx=1; idx < count; idx += 3) {
203 const uint8_t *inhdr = NULL;
204 uint32_t flags;
205
206 if (req->in.vector[idx].iov_len != SMB2_HDR_BODY) {
207 return NT_STATUS_INVALID_PARAMETER;
208 }
209
210 if (req->in.vector[idx+1].iov_len < 2) {
211 return NT_STATUS_INVALID_PARAMETER;
212 }
213
214 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
215
216 /* setup the SMB2 header */
217 if (IVAL(inhdr, SMB2_HDR_PROTOCOL_ID) != SMB2_MAGIC) {
218 return NT_STATUS_INVALID_PARAMETER;
219 }
220
221 flags = IVAL(inhdr, SMB2_HDR_FLAGS);
222 if (idx == 1) {
223 /*
224 * the 1st request should never have the
225 * SMB2_HDR_FLAG_CHAINED flag set
226 */
227 if (flags & SMB2_HDR_FLAG_CHAINED) {
228 req->next_status = NT_STATUS_INVALID_PARAMETER;
229 return NT_STATUS_OK;
230 }
231 } else if (idx == 4) {
232 /*
233 * the 2nd request triggers related vs. unrelated
234 * compounded requests
235 */
236 if (flags & SMB2_HDR_FLAG_CHAINED) {
237 compound_related = true;
238 }
239 } else if (idx > 4) {
240 /*
241 * all other requests should match the 2nd one
242 */
243 if (flags & SMB2_HDR_FLAG_CHAINED) {
244 if (!compound_related) {
245 req->next_status =
246 NT_STATUS_INVALID_PARAMETER;
247 return NT_STATUS_OK;
248 }
249 } else {
250 if (compound_related) {
251 req->next_status =
252 NT_STATUS_INVALID_PARAMETER;
253 return NT_STATUS_OK;
254 }
255 }
256 }
257 }
258
259 return NT_STATUS_OK;
260 }
261
262 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
263 {
264 struct iovec *vector;
265 int count;
266 int idx;
267
268 count = req->in.vector_count;
269 vector = talloc_array(req, struct iovec, count);
270 if (vector == NULL) {
271 return NT_STATUS_NO_MEMORY;
272 }
273
274 vector[0].iov_base = req->out.nbt_hdr;
275 vector[0].iov_len = 4;
276 SIVAL(req->out.nbt_hdr, 0, 0);
277
278 for (idx=1; idx < count; idx += 3) {
279 const uint8_t *inhdr = NULL;
280 uint32_t in_flags;
281 uint8_t *outhdr = NULL;
282 uint8_t *outbody = NULL;
283 uint32_t next_command_ofs = 0;
284 struct iovec *current = &vector[idx];
285
286 if ((idx + 3) < count) {
287 /* we have a next command */
288 next_command_ofs = SMB2_HDR_BODY + 8;
289 }
290
291 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
292 in_flags = IVAL(inhdr, SMB2_HDR_FLAGS);
293
294 outhdr = talloc_array(vector, uint8_t,
295 SMB2_HDR_BODY + 8);
296 if (outhdr == NULL) {
297 return NT_STATUS_NO_MEMORY;
298 }
299
300 outbody = outhdr + SMB2_HDR_BODY;
301
302 current[0].iov_base = (void *)outhdr;
303 current[0].iov_len = SMB2_HDR_BODY;
304
305 current[1].iov_base = (void *)outbody;
306 current[1].iov_len = 8;
307
308 current[2].iov_base = NULL;
309 current[2].iov_len = 0;
310
311 /* setup the SMB2 header */
312 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID, SMB2_MAGIC);
313 SSVAL(outhdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
314 SSVAL(outhdr, SMB2_HDR_EPOCH, 0);
315 SIVAL(outhdr, SMB2_HDR_STATUS,
316 NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
317 SSVAL(outhdr, SMB2_HDR_OPCODE,
318 SVAL(inhdr, SMB2_HDR_OPCODE));
319 /* Make up a number for now... JRA. FIXME ! FIXME !*/
320 SSVAL(outhdr, SMB2_HDR_CREDIT, 20);
321 SIVAL(outhdr, SMB2_HDR_FLAGS,
322 IVAL(inhdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_REDIRECT);
323 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
324 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
325 BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
326 SIVAL(outhdr, SMB2_HDR_PID,
327 IVAL(inhdr, SMB2_HDR_PID));
328 SIVAL(outhdr, SMB2_HDR_TID,
329 IVAL(inhdr, SMB2_HDR_TID));
330 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
331 BVAL(inhdr, SMB2_HDR_SESSION_ID));
332 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
333
334 /* setup error body header */
335 SSVAL(outbody, 0x00, 0x08 + 1);
336 SSVAL(outbody, 0x02, 0);
337 SIVAL(outbody, 0x04, 0);
338 }
339
340 req->out.vector = vector;
341 req->out.vector_count = count;
342
343 /* setup the length of the NBT packet */
344 smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
345
346 return NT_STATUS_OK;
347 }
348
349 void smbd_server_connection_terminate_ex(struct smbd_server_connection *sconn,
350 const char *reason,
351 const char *location)
352 {
353 DEBUG(10,("smbd_server_connection_terminate_ex: reason[%s] at %s\n",
354 reason, location));
355 exit_server_cleanly(reason);
356 }
357
358 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
359 {
360 const uint8_t *inhdr;
361 int i = req->current_idx;
362 uint16_t opcode;
363 uint32_t flags;
364 NTSTATUS status;
365 NTSTATUS session_status;
366
367 inhdr = (const uint8_t *)req->in.vector[i].iov_base;
368
369 /* TODO: verify more things */
370
371 flags = IVAL(inhdr, SMB2_HDR_FLAGS);
372 opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
373 DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
374
375 #define TMP_SMB2_ALLOWED_FLAGS ( \
376 SMB2_HDR_FLAG_CHAINED | \
377 SMB2_HDR_FLAG_SIGNED | \
378 SMB2_HDR_FLAG_DFS)
379 if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
380 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
381 }
382 #undef TMP_SMB2_ALLOWED_FLAGS
383
384 session_status = smbd_smb2_request_check_session(req);
385
386 req->do_signing = false;
387 if (flags & SMB2_HDR_FLAG_SIGNED) {
388 if (!NT_STATUS_IS_OK(session_status)) {
389 return smbd_smb2_request_error(req, session_status);
390 }
391
392 req->do_signing = true;
393 status = smb2_signing_check_pdu(req->session->session_key,
394 &req->in.vector[i], 3);
395 if (!NT_STATUS_IS_OK(status)) {
396 return smbd_smb2_request_error(req, status);
397 }
398 } else if (req->session && req->session->do_signing) {
399 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
400 }
401
402 if (flags & SMB2_HDR_FLAG_CHAINED) {
403 /*
404 * This check is mostly for giving the correct error code
405 * for compounded requests.
406 *
407 * TODO: we may need to move this after the session
408 * and tcon checks.
409 */
410 if (!NT_STATUS_IS_OK(req->next_status)) {
411 return smbd_smb2_request_error(req, req->next_status);
412 }
413 } else {
414 req->compat_chain_fsp = NULL;
415 }
416
417 switch (opcode) {
418 case SMB2_OP_NEGPROT:
419 return smbd_smb2_request_process_negprot(req);
420
421 case SMB2_OP_SESSSETUP:
422 return smbd_smb2_request_process_sesssetup(req);
423
424 case SMB2_OP_LOGOFF:
425 if (!NT_STATUS_IS_OK(session_status)) {
426 return smbd_smb2_request_error(req, session_status);
427 }
428 return smbd_smb2_request_process_logoff(req);
429
430 case SMB2_OP_TCON:
431 if (!NT_STATUS_IS_OK(session_status)) {
432 return smbd_smb2_request_error(req, session_status);
433 }
434 status = smbd_smb2_request_check_session(req);
435 if (!NT_STATUS_IS_OK(status)) {
436 return smbd_smb2_request_error(req, status);
437 }
438 return smbd_smb2_request_process_tcon(req);
439
440 case SMB2_OP_TDIS:
441 if (!NT_STATUS_IS_OK(session_status)) {
442 return smbd_smb2_request_error(req, session_status);
443 }
444 status = smbd_smb2_request_check_tcon(req);
445 if (!NT_STATUS_IS_OK(status)) {
446 return smbd_smb2_request_error(req, status);
447 }
448 return smbd_smb2_request_process_tdis(req);
449
450 case SMB2_OP_CREATE:
451 if (!NT_STATUS_IS_OK(session_status)) {
452 return smbd_smb2_request_error(req, session_status);
453 }
454 status = smbd_smb2_request_check_tcon(req);
455 if (!NT_STATUS_IS_OK(status)) {
456 return smbd_smb2_request_error(req, status);
457 }
458 return smbd_smb2_request_process_create(req);
459
460 case SMB2_OP_CLOSE:
461 if (!NT_STATUS_IS_OK(session_status)) {
462 return smbd_smb2_request_error(req, session_status);
463 }
464 status = smbd_smb2_request_check_tcon(req);
465 if (!NT_STATUS_IS_OK(status)) {
466 return smbd_smb2_request_error(req, status);
467 }
468 return smbd_smb2_request_process_close(req);
469
470 case SMB2_OP_FLUSH:
471 if (!NT_STATUS_IS_OK(session_status)) {
472 return smbd_smb2_request_error(req, session_status);
473 }
474 status = smbd_smb2_request_check_tcon(req);
475 if (!NT_STATUS_IS_OK(status)) {
476 return smbd_smb2_request_error(req, status);
477 }
478 return smbd_smb2_request_process_flush(req);
479
480 case SMB2_OP_READ:
481 if (!NT_STATUS_IS_OK(session_status)) {
482 return smbd_smb2_request_error(req, session_status);
483 }
484 status = smbd_smb2_request_check_tcon(req);
485 if (!NT_STATUS_IS_OK(status)) {
486 return smbd_smb2_request_error(req, status);
487 }
488 return smbd_smb2_request_process_read(req);
489
490 case SMB2_OP_WRITE:
491 if (!NT_STATUS_IS_OK(session_status)) {
492 return smbd_smb2_request_error(req, session_status);
493 }
494 status = smbd_smb2_request_check_tcon(req);
495 if (!NT_STATUS_IS_OK(status)) {
496 return smbd_smb2_request_error(req, status);
497 }
498 return smbd_smb2_request_process_write(req);
499
500 case SMB2_OP_LOCK:
501 if (!NT_STATUS_IS_OK(session_status)) {
502 return smbd_smb2_request_error(req, session_status);
503 }
504 status = smbd_smb2_request_check_tcon(req);
505 if (!NT_STATUS_IS_OK(status)) {
506 return smbd_smb2_request_error(req, status);
507 }
508 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
509
510 case SMB2_OP_IOCTL:
511 if (!NT_STATUS_IS_OK(session_status)) {
512 return smbd_smb2_request_error(req, session_status);
513 }
514 status = smbd_smb2_request_check_tcon(req);
515 if (!NT_STATUS_IS_OK(status)) {
516 return smbd_smb2_request_error(req, status);
517 }
518 return smbd_smb2_request_process_ioctl(req);
519
520 case SMB2_OP_CANCEL:
521 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
522
523 case SMB2_OP_KEEPALIVE:
524 return smbd_smb2_request_process_keepalive(req);
525
526 case SMB2_OP_FIND:
527 if (!NT_STATUS_IS_OK(session_status)) {
528 return smbd_smb2_request_error(req, session_status);
529 }
530 status = smbd_smb2_request_check_tcon(req);
531 if (!NT_STATUS_IS_OK(status)) {
532 return smbd_smb2_request_error(req, status);
533 }
534 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
535
536 case SMB2_OP_NOTIFY:
537 if (!NT_STATUS_IS_OK(session_status)) {
538 return smbd_smb2_request_error(req, session_status);
539 }
540 status = smbd_smb2_request_check_tcon(req);
541 if (!NT_STATUS_IS_OK(status)) {
542 return smbd_smb2_request_error(req, status);
543 }
544 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
545
546 case SMB2_OP_GETINFO:
547 if (!NT_STATUS_IS_OK(session_status)) {
548 return smbd_smb2_request_error(req, session_status);
549 }
550 status = smbd_smb2_request_check_tcon(req);
551 if (!NT_STATUS_IS_OK(status)) {
552 return smbd_smb2_request_error(req, status);
553 }
554 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
555
556 case SMB2_OP_SETINFO:
557 if (!NT_STATUS_IS_OK(session_status)) {
558 return smbd_smb2_request_error(req, session_status);
559 }
560 status = smbd_smb2_request_check_tcon(req);
561 if (!NT_STATUS_IS_OK(status)) {
562 return smbd_smb2_request_error(req, status);
563 }
564 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
565
566 case SMB2_OP_BREAK:
567 if (!NT_STATUS_IS_OK(session_status)) {
568 return smbd_smb2_request_error(req, session_status);
569 }
570 status = smbd_smb2_request_check_tcon(req);
571 if (!NT_STATUS_IS_OK(status)) {
572 return smbd_smb2_request_error(req, status);
573 }
574 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
575 }
576
577 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
578 }
579
580 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
581 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
582
583 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
584 {
585 struct tevent_req *subreq;
586
587 smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
588
589 if (req->do_signing) {
590 int i = req->current_idx;
591 NTSTATUS status;
592 status = smb2_signing_sign_pdu(req->session->session_key,
593 &req->out.vector[i], 3);
594 if (!NT_STATUS_IS_OK(status)) {
595 return status;
596 }
597 }
598
599 req->current_idx += 3;
600
601 if (req->current_idx < req->out.vector_count) {
602 struct timeval zero = timeval_zero();
603 subreq = tevent_wakeup_send(req,
604 req->conn->smb2.event_ctx,
605 zero);
606 if (subreq == NULL) {
607 return NT_STATUS_NO_MEMORY;
608 }
609 tevent_req_set_callback(subreq,
610 smbd_smb2_request_dispatch_compound,
611 req);
612
613 return NT_STATUS_OK;
614 }
615
616 subreq = tstream_writev_queue_send(req,
617 req->conn->smb2.event_ctx,
618 req->conn->smb2.stream,
619 req->conn->smb2.send_queue,
620 req->out.vector,
621 req->out.vector_count);
622 if (subreq == NULL) {
623 return NT_STATUS_NO_MEMORY;
624 }
625 tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
626
627 return NT_STATUS_OK;
628 }
629
630 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
631 {
632 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
633 struct smbd_smb2_request);
634 struct smbd_server_connection *conn = req->conn;
635 NTSTATUS status;
636
637 tevent_wakeup_recv(subreq);
638 TALLOC_FREE(subreq);
639
640 DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
641 req->current_idx, req->in.vector_count));
642
643 status = smbd_smb2_request_dispatch(req);
644 if (!NT_STATUS_IS_OK(status)) {
645 smbd_server_connection_terminate(conn, nt_errstr(status));
646 return;
647 }
648 }
649
650 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
651 {
652 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
653 struct smbd_smb2_request);
654 struct smbd_server_connection *conn = req->conn;
655 int ret;
656 int sys_errno;
657 TALLOC_CTX *mem_pool;
658
659 ret = tstream_writev_queue_recv(subreq, &sys_errno);
660 TALLOC_FREE(subreq);
661 if (ret == -1) {
662 NTSTATUS status = map_nt_error_from_unix(sys_errno);
663 smbd_server_connection_terminate(conn, nt_errstr(status));
664 return;
665 }
666
667 mem_pool = req->mem_pool;
668 req = NULL;
669 talloc_free(mem_pool);
670 }
671
672 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
673 NTSTATUS status,
674 DATA_BLOB *info,
675 const char *location)
676 {
677 uint8_t *outhdr;
678 uint8_t *outbody;
679 int i = req->current_idx;
680
681 DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
682 i, nt_errstr(status), info ? " +info" : "",
683 location));
684
685 outhdr = (uint8_t *)req->out.vector[i].iov_base;
686
687 SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
688
689 outbody = outhdr + SMB2_HDR_BODY;
690
691 req->out.vector[i+1].iov_base = (void *)outbody;
692 req->out.vector[i+1].iov_len = 8;
693
694 if (info) {
695 SIVAL(outbody, 0x04, info->length);
696 req->out.vector[i+2].iov_base = (void *)info->data;
697 req->out.vector[i+2].iov_len = info->length;
698 } else {
699 req->out.vector[i+2].iov_base = NULL;
700 req->out.vector[i+2].iov_len = 0;
701 }
702
703 /*
704 * if a request fails, all other remaining
705 * compounded requests should fail too
706 */
707 req->next_status = NT_STATUS_INVALID_PARAMETER;
708
709 return smbd_smb2_request_reply(req);
710 }
711
712 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
713 NTSTATUS status,
714 DATA_BLOB body, DATA_BLOB *dyn,
715 const char *location)
716 {
717 uint8_t *outhdr;
718 uint8_t *outdyn;
719 int i = req->current_idx;
720 uint32_t next_command_ofs;
721
722 DEBUG(10,("smbd_smb2_request_done_ex: "
723 "idx[%d] status[%s] body[%u] dyn[%s:%u] at %s\n",
724 i, nt_errstr(status), (unsigned int)body.length,
725 dyn ? "yes": "no",
726 (unsigned int)(dyn ? dyn->length : 0),
727 location));
728
729 if (body.length < 2) {
730 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
731 }
732
733 if ((body.length % 2) != 0) {
734 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
735 }
736
737 outhdr = (uint8_t *)req->out.vector[i].iov_base;
738 /* the fallback dynamic buffer */
739 outdyn = outhdr + SMB2_HDR_BODY + 8;
740
741 next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
742 SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
743
744 req->out.vector[i+1].iov_base = (void *)body.data;
745 req->out.vector[i+1].iov_len = body.length;
746
747 if (dyn) {
748 req->out.vector[i+2].iov_base = (void *)dyn->data;
749 req->out.vector[i+2].iov_len = dyn->length;
750 } else {
751 req->out.vector[i+2].iov_base = NULL;
752 req->out.vector[i+2].iov_len = 0;
753 }
754
755 /* see if we need to recalculate the offset to the next response */
756 if (next_command_ofs > 0) {
757 next_command_ofs = SMB2_HDR_BODY;
758 next_command_ofs += req->out.vector[i+1].iov_len;
759 next_command_ofs += req->out.vector[i+2].iov_len;
760 }
761
762 if ((next_command_ofs % 8) != 0) {
763 size_t pad_size = 8 - (next_command_ofs % 8);
764 if (req->out.vector[i+2].iov_len == 0) {
765 /*
766 * if the dyn buffer is empty
767 * we can use it to add padding
768 */
769 uint8_t *pad;
770
771 pad = talloc_zero_array(req->out.vector,
772 uint8_t, pad_size);
773 if (pad == NULL) {
774 return smbd_smb2_request_error(req,
775 NT_STATUS_NO_MEMORY);
776 }
777
778 req->out.vector[i+2].iov_base = (void *)pad;
779 req->out.vector[i+2].iov_len = pad_size;
780 } else {
781 /*
782 * For now we copy the dynamic buffer
783 * and add the padding to the new buffer
784 */
785 size_t old_size;
786 uint8_t *old_dyn;
787 size_t new_size;
788 uint8_t *new_dyn;
789
790 old_size = req->out.vector[i+2].iov_len;
791 old_dyn = (uint8_t *)req->out.vector[i+2].iov_base;
792
793 new_size = old_size + pad_size;
794 new_dyn = talloc_array(req->out.vector,
795 uint8_t, new_size);
796 if (new_dyn == NULL) {
797 return smbd_smb2_request_error(req,
798 NT_STATUS_NO_MEMORY);
799 }
800
801 memcpy(new_dyn, old_dyn, old_size);
802 memset(new_dyn + old_size, 0, pad_size);
803
804 req->out.vector[i+2].iov_base = (void *)new_dyn;
805 req->out.vector[i+2].iov_len = new_size;
806
807 TALLOC_FREE(old_dyn);
808 }
809 next_command_ofs += pad_size;
810 }
811
812 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
813
814 return smbd_smb2_request_reply(req);
815 }
816
817 struct smbd_smb2_request_read_state {
818 size_t missing;
819 bool asked_for_header;
820 struct smbd_smb2_request *smb2_req;
821 };
822
823 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
824 void *private_data,
825 TALLOC_CTX *mem_ctx,
826 struct iovec **_vector,
827 size_t *_count);
828 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
829
830 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
831 struct tevent_context *ev,
832 struct smbd_server_connection *conn)
833 {
834 struct tevent_req *req;
835 struct smbd_smb2_request_read_state *state;
836 struct tevent_req *subreq;
837 TALLOC_CTX *mem_pool;
838
839 req = tevent_req_create(mem_ctx, &state,
840 struct smbd_smb2_request_read_state);
841 if (req == NULL) {
842 return NULL;
843 }
844 state->missing = 0;
845 state->asked_for_header = false;
846
847 mem_pool = talloc_pool(state, 8192);
848 if (tevent_req_nomem(mem_pool, req)) {
849 return tevent_req_post(req, ev);
850 }
851
852 state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
853 if (tevent_req_nomem(state->smb2_req, req)) {
854 return tevent_req_post(req, ev);
855 }
856
857 state->smb2_req->mem_pool = mem_pool;
858 state->smb2_req->conn = conn;
859
860 subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
861 conn->smb2.recv_queue,
862 smbd_smb2_request_next_vector,
863 state);
864 if (tevent_req_nomem(subreq, req)) {
865 return tevent_req_post(req, ev);
866 }
867 tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
868
869 return req;
870 }
871
872 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
873 void *private_data,
874 TALLOC_CTX *mem_ctx,
875 struct iovec **_vector,
876 size_t *_count)
877 {
878 struct smbd_smb2_request_read_state *state =
879 talloc_get_type_abort(private_data,
880 struct smbd_smb2_request_read_state);
881 struct smbd_smb2_request *req = state->smb2_req;
882 struct iovec *vector;
883 int idx = req->in.vector_count;
884 size_t len = 0;
885 uint8_t *buf = NULL;
886
887 if (req->in.vector_count == 0) {
888 /*
889 * first we need to get the NBT header
890 */
891 req->in.vector = talloc_array(req, struct iovec,
892 req->in.vector_count + 1);
893 if (req->in.vector == NULL) {
894 return -1;
895 }
896 req->in.vector_count += 1;
897
898 req->in.vector[idx].iov_base = (void *)req->in.nbt_hdr;
899 req->in.vector[idx].iov_len = 4;
900
901 vector = talloc_array(mem_ctx, struct iovec, 1);
902 if (vector == NULL) {
903 return -1;
904 }
905
906 vector[0] = req->in.vector[idx];
907
908 *_vector = vector;
909 *_count = 1;
910 return 0;
911 }
912
913 if (req->in.vector_count == 1) {
914 /*
915 * Now we analyze the NBT header
916 */
917 state->missing = smb2_len(req->in.vector[0].iov_base);
918
919 if (state->missing == 0) {
920 /* if there're no remaining bytes, we're done */
921 *_vector = NULL;
922 *_count = 0;
923 return 0;
924 }
925
926 req->in.vector = talloc_realloc(req, req->in.vector,
927 struct iovec,
928 req->in.vector_count + 1);
929 if (req->in.vector == NULL) {
930 return -1;
931 }
932 req->in.vector_count += 1;
933
934 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
935 /*
936 * it's a special NBT message,
937 * so get all remaining bytes
938 */
939 len = state->missing;
940 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
941 /*
942 * it's an invalid message, just read what we can get
943 * and let the caller handle the error
944 */
945 len = state->missing;
946 } else {
947 /*
948 * We assume it's a SMB2 request,
949 * and we first get the header and the
950 * first 2 bytes (the struct size) of the body
951 */
952 len = SMB2_HDR_BODY + 2;
953
954 state->asked_for_header = true;
955 }
956
957 state->missing -= len;
958
959 buf = talloc_array(req->in.vector, uint8_t, len);
960 if (buf == NULL) {
961 return -1;
962 }
963
964 req->in.vector[idx].iov_base = (void *)buf;
965 req->in.vector[idx].iov_len = len;
966
967 vector = talloc_array(mem_ctx, struct iovec, 1);
968 if (vector == NULL) {
969 return -1;
970 }
971
972 vector[0] = req->in.vector[idx];
973
974 *_vector = vector;
975 *_count = 1;
976 return 0;
977 }
978
979 if (state->missing == 0) {
980 /* if there're no remaining bytes, we're done */
981 *_vector = NULL;
982 *_count = 0;
983 return 0;
984 }
985
986 if (state->asked_for_header) {
987 const uint8_t *hdr;
988 size_t full_size;
989 size_t next_command_ofs;
990 size_t body_size;
991 uint8_t *body;
992 size_t dyn_size;
993 uint8_t *dyn;
994 bool invalid = false;
995
996 state->asked_for_header = false;
997
998 /*
999 * We got the SMB2 header and the first 2 bytes
1000 * of the body. We fix the size to just the header
1001 * and manually copy the 2 first bytes to the body section
1002 */
1003 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
1004 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
1005
1006 /* allocate vectors for body and dynamic areas */
1007 req->in.vector = talloc_realloc(req, req->in.vector,
1008 struct iovec,
1009 req->in.vector_count + 2);
1010 if (req->in.vector == NULL) {
1011 return -1;
1012 }
1013 req->in.vector_count += 2;
1014
1015 full_size = state->missing + SMB2_HDR_BODY + 2;
1016 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
1017 body_size = SVAL(hdr, SMB2_HDR_BODY);
1018
1019 if (next_command_ofs != 0) {
1020 if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
1021 /*
1022 * this is invalid, just return a zero
1023 * body and let the caller deal with the error
1024 */
1025 invalid = true;
1026 } else if (next_command_ofs > full_size) {
1027 /*
1028 * this is invalid, just return a zero
1029 * body and let the caller deal with the error
1030 */
1031 invalid = true;
1032 } else {
1033 full_size = next_command_ofs;
1034 }
1035 }
1036
1037 if (!invalid) {
1038 if (body_size < 2) {
1039 /*
1040 * this is invalid, just return a zero
1041 * body and let the caller deal with the error
1042 */
1043 invalid = true;
1044 } else if (body_size > (full_size - SMB2_HDR_BODY)) {
1045 /*
1046 * this is invalid, just return a zero
1047 * body and let the caller deal with the error
1048 */
1049 invalid = true;
1050 }
1051 }
1052
1053 if (invalid) {
1054 /* the caller should check this */
1055 body_size = 0;
1056 }
1057
1058 if ((body_size % 2) != 0) {
1059 body_size -= 1;
1060 }
1061
1062 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
1063
1064 state->missing -= (body_size - 2) + dyn_size;
1065
1066 body = talloc_array(req->in.vector, uint8_t, body_size);
1067 if (body == NULL) {
1068 return -1;
1069 }
1070
1071 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
1072 if (dyn == NULL) {
1073 return -1;
1074 }
1075
1076 req->in.vector[idx].iov_base = (void *)body;
1077 req->in.vector[idx].iov_len = body_size;
1078 req->in.vector[idx+1].iov_base = (void *)dyn;
1079 req->in.vector[idx+1].iov_len = dyn_size;
1080
1081 vector = talloc_array(mem_ctx, struct iovec, 2);
1082 if (vector == NULL) {
1083 return -1;
1084 }
1085
1086 /*
1087 * the first 2 bytes of the body were already fetched
1088 * together with the header
1089 */
1090 memcpy(body, hdr + SMB2_HDR_BODY, 2);
1091 vector[0].iov_base = body + 2;
1092 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
1093
1094 vector[1] = req->in.vector[idx+1];
1095
1096 *_vector = vector;
1097 *_count = 2;
1098 return 0;
1099 }
1100
1101 /*
1102 * when we endup here, we're looking for a new SMB2 request
1103 * next. And we ask for its header and the first 2 bytes of
1104 * the body (like we did for the first SMB2 request).
1105 */
1106
1107 req->in.vector = talloc_realloc(req, req->in.vector,
1108 struct iovec,
1109 req->in.vector_count + 1);
1110 if (req->in.vector == NULL) {
1111 return -1;
1112 }
1113 req->in.vector_count += 1;
1114
1115 /*
1116 * We assume it's a SMB2 request,
1117 * and we first get the header and the
1118 * first 2 bytes (the struct size) of the body
1119 */
1120 len = SMB2_HDR_BODY + 2;
1121
1122 if (len > state->missing) {
1123 /* let the caller handle the error */
1124 len = state->missing;
1125 }
1126
1127 state->missing -= len;
1128 state->asked_for_header = true;
1129
1130 buf = talloc_array(req->in.vector, uint8_t, len);
1131 if (buf == NULL) {
1132 return -1;
1133 }
1134
1135 req->in.vector[idx].iov_base = (void *)buf;
1136 req->in.vector[idx].iov_len = len;
1137
1138 vector = talloc_array(mem_ctx, struct iovec, 1);
1139 if (vector == NULL) {
1140 return -1;
1141 }
1142
1143 vector[0] = req->in.vector[idx];
1144
1145 *_vector = vector;
1146 *_count = 1;
1147 return 0;
1148 }
1149
1150 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1151 {
1152 struct tevent_req *req =
1153 tevent_req_callback_data(subreq,
1154 struct tevent_req);
1155 int ret;
1156 int sys_errno;
1157 NTSTATUS status;
1158
1159 ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1160 if (ret == -1) {
1161 status = map_nt_error_from_unix(sys_errno);
1162 tevent_req_nterror(req, status);
1163 return;
1164 }
1165
1166 tevent_req_done(req);
1167 }
1168
1169 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1170 TALLOC_CTX *mem_ctx,
1171 struct smbd_smb2_request **_smb2_req)
1172 {
1173 struct smbd_smb2_request_read_state *state =
1174 tevent_req_data(req,
1175 struct smbd_smb2_request_read_state);
1176 NTSTATUS status;
1177
1178 if (tevent_req_is_nterror(req, &status)) {
1179 tevent_req_received(req);
1180 return status;
1181 }
1182
1183 talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1184 *_smb2_req = state->smb2_req;
1185 tevent_req_received(req);
1186 return NT_STATUS_OK;
1187 }
1188
1189 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1190
1191 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1192 const uint8_t *inbuf, size_t size)
1193 {
1194 NTSTATUS status;
1195 struct smbd_smb2_request *req;
1196 struct tevent_req *subreq;
1197
1198 DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1199 (unsigned int)size));
1200
1201 status = smbd_initialize_smb2(conn);
1202 if (!NT_STATUS_IS_OK(status)) {
1203 smbd_server_connection_terminate(conn, nt_errstr(status));
1204 return;
1205 }
1206
1207 status = smbd_smb2_request_create(conn, inbuf, size, &req);
1208 if (!NT_STATUS_IS_OK(status)) {
1209 smbd_server_connection_terminate(conn, nt_errstr(status));
1210 return;
1211 }
1212
1213 status = smbd_smb2_request_setup_out(req);
1214 if (!NT_STATUS_IS_OK(status)) {
1215 smbd_server_connection_terminate(conn, nt_errstr(status));
1216 return;
1217 }
1218
1219 status = smbd_smb2_request_dispatch(req);
1220 if (!NT_STATUS_IS_OK(status)) {
1221 smbd_server_connection_terminate(conn, nt_errstr(status));
1222 return;
1223 }
1224
1225 /* ask for the next request */
1226 subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1227 if (subreq == NULL) {
1228 smbd_server_connection_terminate(conn, "no memory for reading");
1229 return;
1230 }
1231 tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1232 }
1233
1234 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1235 {
1236 struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1237 struct smbd_server_connection);
1238 NTSTATUS status;
1239 struct smbd_smb2_request *req;
1240
1241 status = smbd_smb2_request_read_recv(subreq, conn, &req);
1242 TALLOC_FREE(subreq);
1243 if (!NT_STATUS_IS_OK(status)) {
1244 smbd_server_connection_terminate(conn, nt_errstr(status));
1245 return;
1246 }
1247
1248 if (req->in.nbt_hdr[0] != 0x00) {
1249 DEBUG(1,("smbd_smb2_request_incoming: ignore NBT[0x%02X] msg\n",
1250 req->in.nbt_hdr[0]));
1251 talloc_free(req->mem_pool);
1252 req = NULL;
1253 goto next;
1254 }
1255
1256 req->current_idx = 1;
1257
1258 DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1259 req->current_idx, req->in.vector_count));
1260
1261 status = smbd_smb2_request_validate(req);
1262 if (!NT_STATUS_IS_OK(status)) {
1263 smbd_server_connection_terminate(conn, nt_errstr(status));
1264 return;
1265 }
1266
1267 status = smbd_smb2_request_setup_out(req);
1268 if (!NT_STATUS_IS_OK(status)) {
1269 smbd_server_connection_terminate(conn, nt_errstr(status));
1270 return;
1271 }
1272
1273 status = smbd_smb2_request_dispatch(req);
1274 if (!NT_STATUS_IS_OK(status)) {
1275 smbd_server_connection_terminate(conn, nt_errstr(status));
1276 return;
1277 }
1278
1279 next:
1280 /* ask for the next request (this constructs the main loop) */
1281 subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1282 if (subreq == NULL) {
1283 smbd_server_connection_terminate(conn, "no memory for reading");
1284 return;
1285 }
1286 tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1287 }
reg import