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Fix the build of nfs4_acls.c
[Samba.git] / source3 / smbd / smb2_server.c
blob0d901714e063e7297ab5fbd7d9343bd769749b5b
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 = 0x00FFFFFF;
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_setup_out(struct smbd_smb2_request *req)
190 {
191 struct iovec *vector;
192 int count;
193 int idx;
194
195 count = req->in.vector_count;
196 vector = talloc_array(req, struct iovec, count);
197 if (vector == NULL) {
198 return NT_STATUS_NO_MEMORY;
199 }
200
201 vector[0].iov_base = req->out.nbt_hdr;
202 vector[0].iov_len = 4;
203 SIVAL(req->out.nbt_hdr, 0, 0);
204
205 for (idx=1; idx < count; idx += 3) {
206 const uint8_t *inhdr = NULL;
207 uint8_t *outhdr = NULL;
208 uint8_t *outbody = NULL;
209 uint8_t *outdyn = NULL;
210 size_t outdyn_size = 1;
211 uint32_t next_command_ofs = 0;
212 struct iovec *current = &vector[idx];
213
214 if ((idx + 3) < count) {
215 /* we have a next command */
216 next_command_ofs = SMB2_HDR_BODY + 8 + 8;
217 outdyn_size = 8;
218 }
219
220 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
221
222 outhdr = talloc_array(vector, uint8_t,
223 SMB2_HDR_BODY + 8 + outdyn_size);
224 if (outhdr == NULL) {
225 return NT_STATUS_NO_MEMORY;
226 }
227
228 outbody = outhdr + SMB2_HDR_BODY;
229 outdyn = outbody + 8;
230
231 current[0].iov_base = (void *)outhdr;
232 current[0].iov_len = SMB2_HDR_BODY;
233
234 current[1].iov_base = (void *)outbody;
235 current[1].iov_len = 8;
236
237 current[2].iov_base = (void *)outdyn;
238 current[2].iov_len = outdyn_size;
239
240 /* setup the SMB2 header */
241 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID, SMB2_MAGIC);
242 SSVAL(outhdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
243 SSVAL(outhdr, SMB2_HDR_EPOCH, 0);
244 SIVAL(outhdr, SMB2_HDR_STATUS,
245 NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
246 SSVAL(outhdr, SMB2_HDR_OPCODE,
247 SVAL(inhdr, SMB2_HDR_OPCODE));
248 SSVAL(outhdr, SMB2_HDR_CREDIT, 0);
249 SIVAL(outhdr, SMB2_HDR_FLAGS, SMB2_HDR_FLAG_REDIRECT);
250 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
251 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
252 BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
253 SIVAL(outhdr, SMB2_HDR_PID,
254 IVAL(inhdr, SMB2_HDR_PID));
255 SIVAL(outhdr, SMB2_HDR_TID,
256 IVAL(inhdr, SMB2_HDR_TID));
257 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
258 BVAL(inhdr, SMB2_HDR_SESSION_ID));
259 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
260
261 /* setup error body header */
262 SSVAL(outbody, 0x00, 9);
263 SSVAL(outbody, 0x02, 0);
264 SIVAL(outbody, 0x04, 0);
265
266 /* setup the dynamic part */
267 SCVAL(outdyn, 0x00, 0);
268 }
269
270 req->out.vector = vector;
271 req->out.vector_count = count;
272
273 /* setup the length of the NBT packet */
274 smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
275
276 return NT_STATUS_OK;
277 }
278
279 static void smbd_server_connection_terminate(struct smbd_server_connection *conn,
280 const char *reason)
281 {
282 DEBUG(10,("smbd_server_connection_terminate: reason[%s]\n", reason));
283 exit_server_cleanly(reason);
284 }
285
286 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
287 {
288 const uint8_t *inhdr;
289 int i = req->current_idx;
290 uint16_t opcode;
291 uint32_t flags;
292 NTSTATUS status;
293 NTSTATUS session_status;
294
295 inhdr = (const uint8_t *)req->in.vector[i].iov_base;
296
297 /* TODO: verify more things */
298
299 flags = IVAL(inhdr, SMB2_HDR_FLAGS);
300 opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
301 DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
302
303 #define TMP_SMB2_ALLOWED_FLAGS ( \
304 SMB2_HDR_FLAG_CHAINED | \
305 SMB2_HDR_FLAG_SIGNED | \
306 SMB2_HDR_FLAG_DFS)
307 if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
308 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
309 }
310 #undef TMP_SMB2_ALLOWED_FLAGS
311
312 session_status = smbd_smb2_request_check_session(req);
313
314 req->do_signing = false;
315 if (flags & SMB2_HDR_FLAG_SIGNED) {
316 if (!NT_STATUS_IS_OK(session_status)) {
317 return smbd_smb2_request_error(req, session_status);
318 }
319
320 req->do_signing = true;
321 status = smb2_signing_check_pdu(req->session->session_key,
322 &req->in.vector[i], 3);
323 if (!NT_STATUS_IS_OK(status)) {
324 return smbd_smb2_request_error(req, status);
325 }
326 } else if (req->session && req->session->do_signing) {
327 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
328 }
329
330 switch (opcode) {
331 case SMB2_OP_NEGPROT:
332 return smbd_smb2_request_process_negprot(req);
333
334 case SMB2_OP_SESSSETUP:
335 return smbd_smb2_request_process_sesssetup(req);
336
337 case SMB2_OP_LOGOFF:
338 if (!NT_STATUS_IS_OK(session_status)) {
339 return smbd_smb2_request_error(req, session_status);
340 }
341 return smbd_smb2_request_process_logoff(req);
342
343 case SMB2_OP_TCON:
344 if (!NT_STATUS_IS_OK(session_status)) {
345 return smbd_smb2_request_error(req, session_status);
346 }
347 status = smbd_smb2_request_check_session(req);
348 if (!NT_STATUS_IS_OK(status)) {
349 return smbd_smb2_request_error(req, status);
350 }
351 return smbd_smb2_request_process_tcon(req);
352
353 case SMB2_OP_TDIS:
354 if (!NT_STATUS_IS_OK(session_status)) {
355 return smbd_smb2_request_error(req, session_status);
356 }
357 status = smbd_smb2_request_check_tcon(req);
358 if (!NT_STATUS_IS_OK(status)) {
359 return smbd_smb2_request_error(req, status);
360 }
361 return smbd_smb2_request_process_tdis(req);
362
363 case SMB2_OP_CREATE:
364 if (!NT_STATUS_IS_OK(session_status)) {
365 return smbd_smb2_request_error(req, session_status);
366 }
367 status = smbd_smb2_request_check_tcon(req);
368 if (!NT_STATUS_IS_OK(status)) {
369 return smbd_smb2_request_error(req, status);
370 }
371 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
372
373 case SMB2_OP_CLOSE:
374 if (!NT_STATUS_IS_OK(session_status)) {
375 return smbd_smb2_request_error(req, session_status);
376 }
377 status = smbd_smb2_request_check_tcon(req);
378 if (!NT_STATUS_IS_OK(status)) {
379 return smbd_smb2_request_error(req, status);
380 }
381 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
382
383 case SMB2_OP_FLUSH:
384 if (!NT_STATUS_IS_OK(session_status)) {
385 return smbd_smb2_request_error(req, session_status);
386 }
387 status = smbd_smb2_request_check_tcon(req);
388 if (!NT_STATUS_IS_OK(status)) {
389 return smbd_smb2_request_error(req, status);
390 }
391 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
392
393 case SMB2_OP_READ:
394 if (!NT_STATUS_IS_OK(session_status)) {
395 return smbd_smb2_request_error(req, session_status);
396 }
397 status = smbd_smb2_request_check_tcon(req);
398 if (!NT_STATUS_IS_OK(status)) {
399 return smbd_smb2_request_error(req, status);
400 }
401 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
402
403 case SMB2_OP_WRITE:
404 if (!NT_STATUS_IS_OK(session_status)) {
405 return smbd_smb2_request_error(req, session_status);
406 }
407 status = smbd_smb2_request_check_tcon(req);
408 if (!NT_STATUS_IS_OK(status)) {
409 return smbd_smb2_request_error(req, status);
410 }
411 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
412
413 case SMB2_OP_LOCK:
414 if (!NT_STATUS_IS_OK(session_status)) {
415 return smbd_smb2_request_error(req, session_status);
416 }
417 status = smbd_smb2_request_check_tcon(req);
418 if (!NT_STATUS_IS_OK(status)) {
419 return smbd_smb2_request_error(req, status);
420 }
421 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
422
423 case SMB2_OP_IOCTL:
424 if (!NT_STATUS_IS_OK(session_status)) {
425 return smbd_smb2_request_error(req, session_status);
426 }
427 status = smbd_smb2_request_check_tcon(req);
428 if (!NT_STATUS_IS_OK(status)) {
429 return smbd_smb2_request_error(req, status);
430 }
431 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
432
433 case SMB2_OP_CANCEL:
434 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
435
436 case SMB2_OP_KEEPALIVE:
437 return smbd_smb2_request_process_keepalive(req);
438
439 case SMB2_OP_FIND:
440 if (!NT_STATUS_IS_OK(session_status)) {
441 return smbd_smb2_request_error(req, session_status);
442 }
443 status = smbd_smb2_request_check_tcon(req);
444 if (!NT_STATUS_IS_OK(status)) {
445 return smbd_smb2_request_error(req, status);
446 }
447 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
448
449 case SMB2_OP_NOTIFY:
450 if (!NT_STATUS_IS_OK(session_status)) {
451 return smbd_smb2_request_error(req, session_status);
452 }
453 status = smbd_smb2_request_check_tcon(req);
454 if (!NT_STATUS_IS_OK(status)) {
455 return smbd_smb2_request_error(req, status);
456 }
457 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
458
459 case SMB2_OP_GETINFO:
460 if (!NT_STATUS_IS_OK(session_status)) {
461 return smbd_smb2_request_error(req, session_status);
462 }
463 status = smbd_smb2_request_check_tcon(req);
464 if (!NT_STATUS_IS_OK(status)) {
465 return smbd_smb2_request_error(req, status);
466 }
467 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
468
469 case SMB2_OP_SETINFO:
470 if (!NT_STATUS_IS_OK(session_status)) {
471 return smbd_smb2_request_error(req, session_status);
472 }
473 status = smbd_smb2_request_check_tcon(req);
474 if (!NT_STATUS_IS_OK(status)) {
475 return smbd_smb2_request_error(req, status);
476 }
477 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
478
479 case SMB2_OP_BREAK:
480 if (!NT_STATUS_IS_OK(session_status)) {
481 return smbd_smb2_request_error(req, session_status);
482 }
483 status = smbd_smb2_request_check_tcon(req);
484 if (!NT_STATUS_IS_OK(status)) {
485 return smbd_smb2_request_error(req, status);
486 }
487 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
488 }
489
490 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
491 }
492
493 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
494 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
495
496 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
497 {
498 struct tevent_req *subreq;
499
500 /* TODO: sign the response here */
501
502 smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
503
504 if (req->do_signing) {
505 int i = req->current_idx;
506 NTSTATUS status;
507 status = smb2_signing_sign_pdu(req->session->session_key,
508 &req->out.vector[i], 3);
509 if (!NT_STATUS_IS_OK(status)) {
510 return status;
511 }
512 }
513
514 req->current_idx += 3;
515
516 if (req->current_idx > req->in.vector_count) {
517 struct timeval zero = timeval_zero();
518 subreq = tevent_wakeup_send(req,
519 req->conn->smb2.event_ctx,
520 zero);
521 if (subreq == NULL) {
522 return NT_STATUS_NO_MEMORY;
523 }
524 tevent_req_set_callback(subreq,
525 smbd_smb2_request_dispatch_compound,
526 req);
527
528 return NT_STATUS_OK;
529 }
530
531 subreq = tstream_writev_queue_send(req,
532 req->conn->smb2.event_ctx,
533 req->conn->smb2.stream,
534 req->conn->smb2.send_queue,
535 req->out.vector,
536 req->out.vector_count);
537 if (subreq == NULL) {
538 return NT_STATUS_NO_MEMORY;
539 }
540 tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
541
542 return NT_STATUS_OK;
543 }
544
545 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
546 {
547 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
548 struct smbd_smb2_request);
549 struct smbd_server_connection *conn = req->conn;
550 NTSTATUS status;
551
552 tevent_wakeup_recv(subreq);
553 TALLOC_FREE(subreq);
554
555 DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
556 req->current_idx, req->in.vector_count));
557
558 status = smbd_smb2_request_dispatch(req);
559 if (!NT_STATUS_IS_OK(status)) {
560 smbd_server_connection_terminate(conn, nt_errstr(status));
561 return;
562 }
563 }
564
565 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
566 {
567 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
568 struct smbd_smb2_request);
569 struct smbd_server_connection *conn = req->conn;
570 int ret;
571 int sys_errno;
572 TALLOC_CTX *mem_pool;
573
574 ret = tstream_writev_queue_recv(subreq, &sys_errno);
575 TALLOC_FREE(subreq);
576 if (ret == -1) {
577 NTSTATUS status = map_nt_error_from_unix(sys_errno);
578 smbd_server_connection_terminate(conn, nt_errstr(status));
579 return;
580 }
581
582 mem_pool = req->mem_pool;
583 req = NULL;
584 talloc_free(mem_pool);
585 }
586
587 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
588 NTSTATUS status,
589 DATA_BLOB *info)
590 {
591 uint8_t *outhdr;
592 uint8_t *outbody;
593 int i = req->current_idx;
594
595 DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
596 i, nt_errstr(status), info ? " +info" : ""));
597
598 outhdr = (uint8_t *)req->out.vector[i].iov_base;
599
600 SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
601
602 outbody = outhdr + SMB2_HDR_BODY;
603
604 req->out.vector[i+1].iov_base = (void *)outbody;
605 req->out.vector[i+1].iov_len = 8;
606
607 if (info) {
608 SIVAL(outbody, 0x04, info->length);
609 req->out.vector[i+2].iov_base = (void *)info->data;
610 req->out.vector[i+2].iov_len = info->length;
611 } else {
612 req->out.vector[i+2].iov_base = (void *)(outbody + 8);
613 req->out.vector[i+2].iov_len = 1;
614 }
615
616 /* the error packet is the last response in the chain */
617 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
618 req->out.vector_count = req->current_idx + 3;
619
620 return smbd_smb2_request_reply(req);
621 }
622
623 NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
624 NTSTATUS status)
625 {
626 return smbd_smb2_request_error_ex(req, status, NULL);
627 }
628
629 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
630 NTSTATUS status,
631 DATA_BLOB body, DATA_BLOB *dyn)
632 {
633 uint8_t *outhdr;
634 uint8_t *outdyn;
635 int i = req->current_idx;
636 uint32_t next_command_ofs;
637
638 DEBUG(10,("smbd_smb2_request_done_ex: "
639 "idx[%d] status[%s] body[%u] dyn[%s:%u]\n",
640 i, nt_errstr(status), (unsigned int)body.length,
641 dyn ? "yes": "no",
642 (unsigned int)(dyn ? dyn->length : 0)));
643
644 if (body.length < 2) {
645 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
646 }
647
648 if ((body.length % 2) != 0) {
649 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
650 }
651
652 outhdr = (uint8_t *)req->out.vector[i].iov_base;
653 /* the fallback dynamic buffer */
654 outdyn = outhdr + SMB2_HDR_BODY + 8;
655
656 next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
657 SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
658
659 req->out.vector[i+1].iov_base = (void *)body.data;
660 req->out.vector[i+1].iov_len = body.length;
661
662 if (dyn) {
663 if (dyn->length > 0) {
664 req->out.vector[i+2].iov_base = (void *)dyn->data;
665 req->out.vector[i+2].iov_len = dyn->length;
666 } else {
667 req->out.vector[i+2].iov_base = (void *)outdyn;
668 req->out.vector[i+2].iov_len = 1;
669 }
670 } else {
671 req->out.vector[i+2].iov_base = NULL;
672 req->out.vector[i+2].iov_len = 0;
673 }
674
675 /* see if we need to recalculate the offset to the next response */
676 if (next_command_ofs > 0) {
677 next_command_ofs = SMB2_HDR_BODY;
678 next_command_ofs += req->out.vector[i+1].iov_len;
679 next_command_ofs += req->out.vector[i+2].iov_len;
680 }
681
682 /* TODO: we need to add padding ... */
683 if ((next_command_ofs % 8) != 0) {
684 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
685 }
686
687 /* the error packet is the last response in the chain */
688 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
689
690 return smbd_smb2_request_reply(req);
691 }
692
693 NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
694 DATA_BLOB body, DATA_BLOB *dyn)
695 {
696 return smbd_smb2_request_done_ex(req, NT_STATUS_OK, body, dyn);
697 }
698
699 struct smbd_smb2_request_read_state {
700 size_t missing;
701 bool asked_for_header;
702 struct smbd_smb2_request *smb2_req;
703 };
704
705 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
706 void *private_data,
707 TALLOC_CTX *mem_ctx,
708 struct iovec **_vector,
709 size_t *_count);
710 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
711
712 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
713 struct tevent_context *ev,
714 struct smbd_server_connection *conn)
715 {
716 struct tevent_req *req;
717 struct smbd_smb2_request_read_state *state;
718 struct tevent_req *subreq;
719 TALLOC_CTX *mem_pool;
720
721 req = tevent_req_create(mem_ctx, &state,
722 struct smbd_smb2_request_read_state);
723 if (req == NULL) {
724 return NULL;
725 }
726 state->missing = 0;
727 state->asked_for_header = false;
728
729 mem_pool = talloc_pool(state, 8192);
730 if (tevent_req_nomem(mem_pool, req)) {
731 return tevent_req_post(req, ev);
732 }
733
734 state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
735 if (tevent_req_nomem(state->smb2_req, req)) {
736 return tevent_req_post(req, ev);
737 }
738
739 state->smb2_req->mem_pool = mem_pool;
740 state->smb2_req->conn = conn;
741
742 subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
743 conn->smb2.recv_queue,
744 smbd_smb2_request_next_vector,
745 state);
746 if (tevent_req_nomem(subreq, req)) {
747 return tevent_req_post(req, ev);
748 }
749 tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
750
751 return req;
752 }
753
754 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
755 void *private_data,
756 TALLOC_CTX *mem_ctx,
757 struct iovec **_vector,
758 size_t *_count)
759 {
760 struct smbd_smb2_request_read_state *state =
761 talloc_get_type_abort(private_data,
762 struct smbd_smb2_request_read_state);
763 struct smbd_smb2_request *req = state->smb2_req;
764 struct iovec *vector;
765 int idx = req->in.vector_count;
766 size_t len = 0;
767 uint8_t *buf = NULL;
768
769 if (req->in.vector_count == 0) {
770 /*
771 * first we need to get the NBT header
772 */
773 req->in.vector = talloc_array(req, struct iovec,
774 req->in.vector_count + 1);
775 if (req->in.vector == NULL) {
776 return -1;
777 }
778 req->in.vector_count += 1;
779
780 req->in.vector[idx].iov_base = (void *)req->in.nbt_hdr;
781 req->in.vector[idx].iov_len = 4;
782
783 vector = talloc_array(mem_ctx, struct iovec, 1);
784 if (vector == NULL) {
785 return -1;
786 }
787
788 vector[0] = req->in.vector[idx];
789
790 *_vector = vector;
791 *_count = 1;
792 return 0;
793 }
794
795 if (req->in.vector_count == 1) {
796 /*
797 * Now we analyze the NBT header
798 */
799 state->missing = smb2_len(req->in.vector[0].iov_base);
800
801 if (state->missing == 0) {
802 /* if there're no remaining bytes, we're done */
803 *_vector = NULL;
804 *_count = 0;
805 return 0;
806 }
807
808 req->in.vector = talloc_realloc(req, req->in.vector,
809 struct iovec,
810 req->in.vector_count + 1);
811 if (req->in.vector == NULL) {
812 return -1;
813 }
814 req->in.vector_count += 1;
815
816 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
817 /*
818 * it's a special NBT message,
819 * so get all remaining bytes
820 */
821 len = state->missing;
822 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
823 /*
824 * it's an invalid message, just read what we can get
825 * and let the caller handle the error
826 */
827 len = state->missing;
828 } else {
829 /*
830 * We assume it's a SMB2 request,
831 * and we first get the header and the
832 * first 2 bytes (the struct size) of the body
833 */
834 len = SMB2_HDR_BODY + 2;
835
836 state->asked_for_header = true;
837 }
838
839 state->missing -= len;
840
841 buf = talloc_array(req->in.vector, uint8_t, len);
842 if (buf == NULL) {
843 return -1;
844 }
845
846 req->in.vector[idx].iov_base = (void *)buf;
847 req->in.vector[idx].iov_len = len;
848
849 vector = talloc_array(mem_ctx, struct iovec, 1);
850 if (vector == NULL) {
851 return -1;
852 }
853
854 vector[0] = req->in.vector[idx];
855
856 *_vector = vector;
857 *_count = 1;
858 return 0;
859 }
860
861 if (state->missing == 0) {
862 /* if there're no remaining bytes, we're done */
863 *_vector = NULL;
864 *_count = 0;
865 return 0;
866 }
867
868 if (state->asked_for_header) {
869 const uint8_t *hdr;
870 size_t full_size;
871 size_t next_command_ofs;
872 size_t body_size;
873 uint8_t *body;
874 size_t dyn_size;
875 uint8_t *dyn;
876 bool invalid = false;
877
878 state->asked_for_header = false;
879
880 /*
881 * We got the SMB2 header and the first 2 bytes
882 * of the body. We fix the size to just the header
883 * and manually copy the 2 first bytes to the body section
884 */
885 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
886 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
887
888 /* allocate vectors for body and dynamic areas */
889 req->in.vector = talloc_realloc(req, req->in.vector,
890 struct iovec,
891 req->in.vector_count + 2);
892 if (req->in.vector == NULL) {
893 return -1;
894 }
895 req->in.vector_count += 2;
896
897 full_size = state->missing + SMB2_HDR_BODY + 2;
898 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
899 body_size = SVAL(hdr, SMB2_HDR_BODY);
900
901 if (next_command_ofs != 0) {
902 if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
903 /*
904 * this is invalid, just return a zero
905 * body and let the caller deal with the error
906 */
907 invalid = true;
908 } else if (next_command_ofs > full_size) {
909 /*
910 * this is invalid, just return a zero
911 * body and let the caller deal with the error
912 */
913 invalid = true;
914 } else {
915 full_size = next_command_ofs;
916 }
917 }
918
919 if (!invalid) {
920 if (body_size < 2) {
921 /*
922 * this is invalid, just return a zero
923 * body and let the caller deal with the error
924 */
925 invalid = true;
926 } else if (body_size > (full_size - SMB2_HDR_BODY)) {
927 /*
928 * this is invalid, just return a zero
929 * body and let the caller deal with the error
930 */
931 invalid = true;
932 }
933 }
934
935 if (invalid) {
936 /* the caller should check this */
937 body_size = 0;
938 }
939
940 if ((body_size % 2) != 0) {
941 body_size -= 1;
942 }
943
944 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
945
946 state->missing -= (body_size - 2) + dyn_size;
947
948 body = talloc_array(req->in.vector, uint8_t, body_size);
949 if (body == NULL) {
950 return -1;
951 }
952
953 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
954 if (dyn == NULL) {
955 return -1;
956 }
957
958 req->in.vector[idx].iov_base = (void *)body;
959 req->in.vector[idx].iov_len = body_size;
960 req->in.vector[idx+1].iov_base = (void *)dyn;
961 req->in.vector[idx+1].iov_len = dyn_size;
962
963 vector = talloc_array(mem_ctx, struct iovec, 2);
964 if (vector == NULL) {
965 return -1;
966 }
967
968 /*
969 * the first 2 bytes of the body were already fetched
970 * together with the header
971 */
972 memcpy(body, hdr + SMB2_HDR_BODY, 2);
973 vector[0].iov_base = body + 2;
974 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
975
976 vector[1] = req->in.vector[idx+1];
977
978 *_vector = vector;
979 *_count = 2;
980 return 0;
981 }
982
983 /*
984 * when we endup here, we're looking for a new SMB2 request
985 * next. And we ask for its header and the first 2 bytes of
986 * the body (like we did for the first SMB2 request).
987 */
988
989 req->in.vector = talloc_realloc(req, req->in.vector,
990 struct iovec,
991 req->in.vector_count + 1);
992 if (req->in.vector == NULL) {
993 return -1;
994 }
995 req->in.vector_count += 1;
996
997 /*
998 * We assume it's a SMB2 request,
999 * and we first get the header and the
1000 * first 2 bytes (the struct size) of the body
1001 */
1002 len = SMB2_HDR_BODY + 2;
1003
1004 if (len > state->missing) {
1005 /* let the caller handle the error */
1006 len = state->missing;
1007 }
1008
1009 state->missing -= len;
1010 state->asked_for_header = true;
1011
1012 buf = talloc_array(req->in.vector, uint8_t, len);
1013 if (buf == NULL) {
1014 return -1;
1015 }
1016
1017 req->in.vector[idx].iov_base = (void *)buf;
1018 req->in.vector[idx].iov_len = len;
1019
1020 vector = talloc_array(mem_ctx, struct iovec, 1);
1021 if (vector == NULL) {
1022 return -1;
1023 }
1024
1025 vector[0] = req->in.vector[idx];
1026
1027 *_vector = vector;
1028 *_count = 1;
1029 return 0;
1030 }
1031
1032 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1033 {
1034 struct tevent_req *req =
1035 tevent_req_callback_data(subreq,
1036 struct tevent_req);
1037 int ret;
1038 int sys_errno;
1039 NTSTATUS status;
1040
1041 ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1042 if (ret == -1) {
1043 status = map_nt_error_from_unix(sys_errno);
1044 tevent_req_nterror(req, status);
1045 return;
1046 }
1047
1048 tevent_req_done(req);
1049 }
1050
1051 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1052 TALLOC_CTX *mem_ctx,
1053 struct smbd_smb2_request **_smb2_req)
1054 {
1055 struct smbd_smb2_request_read_state *state =
1056 tevent_req_data(req,
1057 struct smbd_smb2_request_read_state);
1058 NTSTATUS status;
1059
1060 if (tevent_req_is_nterror(req, &status)) {
1061 tevent_req_received(req);
1062 return status;
1063 }
1064
1065 talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1066 *_smb2_req = state->smb2_req;
1067 tevent_req_received(req);
1068 return NT_STATUS_OK;
1069 }
1070
1071 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1072
1073 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1074 const uint8_t *inbuf, size_t size)
1075 {
1076 NTSTATUS status;
1077 struct smbd_smb2_request *req;
1078 struct tevent_req *subreq;
1079
1080 DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1081 (unsigned int)size));
1082
1083 status = smbd_initialize_smb2(conn);
1084 if (!NT_STATUS_IS_OK(status)) {
1085 smbd_server_connection_terminate(conn, nt_errstr(status));
1086 return;
1087 }
1088
1089 status = smbd_smb2_request_create(conn, inbuf, size, &req);
1090 if (!NT_STATUS_IS_OK(status)) {
1091 smbd_server_connection_terminate(conn, nt_errstr(status));
1092 return;
1093 }
1094
1095 status = smbd_smb2_request_setup_out(req);
1096 if (!NT_STATUS_IS_OK(status)) {
1097 smbd_server_connection_terminate(conn, nt_errstr(status));
1098 return;
1099 }
1100
1101 status = smbd_smb2_request_dispatch(req);
1102 if (!NT_STATUS_IS_OK(status)) {
1103 smbd_server_connection_terminate(conn, nt_errstr(status));
1104 return;
1105 }
1106
1107 /* ask for the next request */
1108 subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1109 if (subreq == NULL) {
1110 smbd_server_connection_terminate(conn, "no memory for reading");
1111 return;
1112 }
1113 tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1114 }
1115
1116 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1117 {
1118 struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1119 struct smbd_server_connection);
1120 NTSTATUS status;
1121 struct smbd_smb2_request *req;
1122
1123 status = smbd_smb2_request_read_recv(subreq, conn, &req);
1124 TALLOC_FREE(subreq);
1125 if (!NT_STATUS_IS_OK(status)) {
1126 smbd_server_connection_terminate(conn, nt_errstr(status));
1127 return;
1128 }
1129
1130 /* TODO: validate the incoming request */
1131 req->current_idx = 1;
1132
1133 DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1134 req->current_idx, req->in.vector_count));
1135
1136 status = smbd_smb2_request_setup_out(req);
1137 if (!NT_STATUS_IS_OK(status)) {
1138 smbd_server_connection_terminate(conn, nt_errstr(status));
1139 return;
1140 }
1141
1142 status = smbd_smb2_request_dispatch(req);
1143 if (!NT_STATUS_IS_OK(status)) {
1144 smbd_server_connection_terminate(conn, nt_errstr(status));
1145 return;
1146 }
1147
1148 /* ask for the next request (this constructs the main loop) */
1149 subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1150 if (subreq == NULL) {
1151 smbd_server_connection_terminate(conn, "no memory for reading");
1152 return;
1153 }
1154 tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1155 }
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