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libcli: SMB2: NetApps negotiate SMB3_11 but also set the SMB2_CAP_ENCRYPTION flag.
[Samba.git] / libcli / smb / smbXcli_base.c
blob54939546d0e8f785708989a854ace14691f97f8f
1 /*
2 Unix SMB/CIFS implementation.
3 Infrastructure for async SMB client requests
4 Copyright (C) Volker Lendecke 2008
5 Copyright (C) Stefan Metzmacher 2011
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/network.h"
23 #include "../lib/async_req/async_sock.h"
24 #include "../lib/util/tevent_ntstatus.h"
25 #include "../lib/util/tevent_unix.h"
26 #include "lib/util/util_net.h"
27 #include "lib/util/dlinklist.h"
28 #include "lib/util/iov_buf.h"
29 #include "../libcli/smb/smb_common.h"
30 #include "../libcli/smb/smb_seal.h"
31 #include "../libcli/smb/smb_signing.h"
32 #include "../libcli/smb/read_smb.h"
33 #include "smbXcli_base.h"
34 #include "librpc/ndr/libndr.h"
35 #include "libcli/smb/smb2_negotiate_context.h"
36 #include "lib/crypto/sha512.h"
37 #include "lib/crypto/aes.h"
38 #include "lib/crypto/aes_ccm_128.h"
39 #include "lib/crypto/aes_gcm_128.h"
40
41 struct smbXcli_conn;
42 struct smbXcli_req;
43 struct smbXcli_session;
44 struct smbXcli_tcon;
45
46 struct smbXcli_conn {
47 int sock_fd;
48 struct sockaddr_storage local_ss;
49 struct sockaddr_storage remote_ss;
50 const char *remote_name;
51
52 struct tevent_queue *outgoing;
53 struct tevent_req **pending;
54 struct tevent_req *read_smb_req;
55 struct tevent_req *suicide_req;
56
57 enum protocol_types min_protocol;
58 enum protocol_types max_protocol;
59 enum protocol_types protocol;
60 bool allow_signing;
61 bool desire_signing;
62 bool mandatory_signing;
63
64 /*
65 * The incoming dispatch function should return:
66 * - NT_STATUS_RETRY, if more incoming PDUs are expected.
67 * - NT_STATUS_OK, if no more processing is desired, e.g.
68 * the dispatch function called
69 * tevent_req_done().
70 * - All other return values disconnect the connection.
71 */
72 NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn,
73 TALLOC_CTX *tmp_mem,
74 uint8_t *inbuf);
75
76 struct {
77 struct {
78 uint32_t capabilities;
79 uint32_t max_xmit;
80 } client;
81
82 struct {
83 uint32_t capabilities;
84 uint32_t max_xmit;
85 uint16_t max_mux;
86 uint16_t security_mode;
87 bool readbraw;
88 bool writebraw;
89 bool lockread;
90 bool writeunlock;
91 uint32_t session_key;
92 struct GUID guid;
93 DATA_BLOB gss_blob;
94 uint8_t challenge[8];
95 const char *workgroup;
96 const char *name;
97 int time_zone;
98 NTTIME system_time;
99 } server;
100
101 uint32_t capabilities;
102 uint32_t max_xmit;
103
104 uint16_t mid;
105
106 struct smb_signing_state *signing;
107 struct smb_trans_enc_state *trans_enc;
108
109 struct tevent_req *read_braw_req;
110 } smb1;
111
112 struct {
113 struct {
114 uint32_t capabilities;
115 uint16_t security_mode;
116 struct GUID guid;
117 } client;
118
119 struct {
120 uint32_t capabilities;
121 uint16_t security_mode;
122 struct GUID guid;
123 uint32_t max_trans_size;
124 uint32_t max_read_size;
125 uint32_t max_write_size;
126 NTTIME system_time;
127 NTTIME start_time;
128 DATA_BLOB gss_blob;
129 uint16_t cipher;
130 } server;
131
132 uint64_t mid;
133 uint16_t cur_credits;
134 uint16_t max_credits;
135
136 uint32_t cc_chunk_len;
137 uint32_t cc_max_chunks;
138
139 uint8_t io_priority;
140
141 uint8_t preauth_sha512[64];
142 } smb2;
143
144 struct smbXcli_session *sessions;
145 };
146
147 struct smb2cli_session {
148 uint64_t session_id;
149 uint16_t session_flags;
150 DATA_BLOB application_key;
151 DATA_BLOB signing_key;
152 bool should_sign;
153 bool should_encrypt;
154 DATA_BLOB encryption_key;
155 DATA_BLOB decryption_key;
156 uint64_t nonce_high_random;
157 uint64_t nonce_high_max;
158 uint64_t nonce_high;
159 uint64_t nonce_low;
160 uint16_t channel_sequence;
161 bool replay_active;
162 };
163
164 struct smbXcli_session {
165 struct smbXcli_session *prev, *next;
166 struct smbXcli_conn *conn;
167
168 struct {
169 uint16_t session_id;
170 uint16_t action;
171 DATA_BLOB application_key;
172 bool protected_key;
173 } smb1;
174
175 struct smb2cli_session *smb2;
176
177 struct {
178 DATA_BLOB signing_key;
179 uint8_t preauth_sha512[64];
180 } smb2_channel;
181
182 /*
183 * this should be a short term hack
184 * until the upper layers have implemented
185 * re-authentication.
186 */
187 bool disconnect_expired;
188 };
189
190 struct smbXcli_tcon {
191 bool is_smb1;
192 uint32_t fs_attributes;
193
194 struct {
195 uint16_t tcon_id;
196 uint16_t optional_support;
197 uint32_t maximal_access;
198 uint32_t guest_maximal_access;
199 char *service;
200 char *fs_type;
201 } smb1;
202
203 struct {
204 uint32_t tcon_id;
205 uint8_t type;
206 uint32_t flags;
207 uint32_t capabilities;
208 uint32_t maximal_access;
209 bool should_sign;
210 bool should_encrypt;
211 } smb2;
212 };
213
214 struct smbXcli_req_state {
215 struct tevent_context *ev;
216 struct smbXcli_conn *conn;
217 struct smbXcli_session *session; /* maybe NULL */
218 struct smbXcli_tcon *tcon; /* maybe NULL */
219
220 uint8_t length_hdr[4];
221
222 bool one_way;
223
224 uint8_t *inbuf;
225
226 struct tevent_req *write_req;
227
228 struct {
229 /* Space for the header including the wct */
230 uint8_t hdr[HDR_VWV];
231
232 /*
233 * For normal requests, smb1cli_req_send chooses a mid.
234 * SecondaryV trans requests need to use the mid of the primary
235 * request, so we need a place to store it.
236 * Assume it is set if != 0.
237 */
238 uint16_t mid;
239
240 uint16_t *vwv;
241 uint8_t bytecount_buf[2];
242
243 #define MAX_SMB_IOV 10
244 /* length_hdr, hdr, words, byte_count, buffers */
245 struct iovec iov[1 + 3 + MAX_SMB_IOV];
246 int iov_count;
247
248 bool one_way_seqnum;
249 uint32_t seqnum;
250 struct tevent_req **chained_requests;
251
252 uint8_t recv_cmd;
253 NTSTATUS recv_status;
254 /* always an array of 3 talloc elements */
255 struct iovec *recv_iov;
256 } smb1;
257
258 struct {
259 const uint8_t *fixed;
260 uint16_t fixed_len;
261 const uint8_t *dyn;
262 uint32_t dyn_len;
263
264 uint8_t transform[SMB2_TF_HDR_SIZE];
265 uint8_t hdr[SMB2_HDR_BODY];
266 uint8_t pad[7]; /* padding space for compounding */
267
268 /*
269 * always an array of 3 talloc elements
270 * (without a SMB2_TRANSFORM header!)
271 *
272 * HDR, BODY, DYN
273 */
274 struct iovec *recv_iov;
275
276 /*
277 * the expected max for the response dyn_len
278 */
279 uint32_t max_dyn_len;
280
281 uint16_t credit_charge;
282
283 bool should_sign;
284 bool should_encrypt;
285 uint64_t encryption_session_id;
286
287 bool signing_skipped;
288 bool notify_async;
289 bool got_async;
290 uint16_t cancel_flags;
291 uint64_t cancel_mid;
292 uint64_t cancel_aid;
293 } smb2;
294 };
295
296 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
297 {
298 /*
299 * NT_STATUS_OK, means we do not notify the callers
300 */
301 smbXcli_conn_disconnect(conn, NT_STATUS_OK);
302
303 while (conn->sessions) {
304 conn->sessions->conn = NULL;
305 DLIST_REMOVE(conn->sessions, conn->sessions);
306 }
307
308 if (conn->smb1.trans_enc) {
309 TALLOC_FREE(conn->smb1.trans_enc);
310 }
311
312 return 0;
313 }
314
315 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
316 int fd,
317 const char *remote_name,
318 enum smb_signing_setting signing_state,
319 uint32_t smb1_capabilities,
320 struct GUID *client_guid,
321 uint32_t smb2_capabilities)
322 {
323 struct smbXcli_conn *conn = NULL;
324 void *ss = NULL;
325 struct sockaddr *sa = NULL;
326 socklen_t sa_length;
327 int ret;
328
329 conn = talloc_zero(mem_ctx, struct smbXcli_conn);
330 if (!conn) {
331 return NULL;
332 }
333
334 conn->sock_fd = fd;
335
336 conn->remote_name = talloc_strdup(conn, remote_name);
337 if (conn->remote_name == NULL) {
338 goto error;
339 }
340
341 ss = (void *)&conn->local_ss;
342 sa = (struct sockaddr *)ss;
343 sa_length = sizeof(conn->local_ss);
344 ret = getsockname(fd, sa, &sa_length);
345 if (ret == -1) {
346 goto error;
347 }
348 ss = (void *)&conn->remote_ss;
349 sa = (struct sockaddr *)ss;
350 sa_length = sizeof(conn->remote_ss);
351 ret = getpeername(fd, sa, &sa_length);
352 if (ret == -1) {
353 goto error;
354 }
355
356 conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
357 if (conn->outgoing == NULL) {
358 goto error;
359 }
360 conn->pending = NULL;
361
362 conn->min_protocol = PROTOCOL_NONE;
363 conn->max_protocol = PROTOCOL_NONE;
364 conn->protocol = PROTOCOL_NONE;
365
366 switch (signing_state) {
367 case SMB_SIGNING_OFF:
368 /* never */
369 conn->allow_signing = false;
370 conn->desire_signing = false;
371 conn->mandatory_signing = false;
372 break;
373 case SMB_SIGNING_DEFAULT:
374 case SMB_SIGNING_IF_REQUIRED:
375 /* if the server requires it */
376 conn->allow_signing = true;
377 conn->desire_signing = false;
378 conn->mandatory_signing = false;
379 break;
380 case SMB_SIGNING_DESIRED:
381 /* if the server desires it */
382 conn->allow_signing = true;
383 conn->desire_signing = true;
384 conn->mandatory_signing = false;
385 break;
386 case SMB_SIGNING_IPC_DEFAULT:
387 case SMB_SIGNING_REQUIRED:
388 /* always */
389 conn->allow_signing = true;
390 conn->desire_signing = true;
391 conn->mandatory_signing = true;
392 break;
393 }
394
395 conn->smb1.client.capabilities = smb1_capabilities;
396 conn->smb1.client.max_xmit = UINT16_MAX;
397
398 conn->smb1.capabilities = conn->smb1.client.capabilities;
399 conn->smb1.max_xmit = 1024;
400
401 conn->smb1.mid = 1;
402
403 /* initialise signing */
404 conn->smb1.signing = smb_signing_init(conn,
405 conn->allow_signing,
406 conn->desire_signing,
407 conn->mandatory_signing);
408 if (!conn->smb1.signing) {
409 goto error;
410 }
411
412 conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
413 if (conn->mandatory_signing) {
414 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
415 }
416 if (client_guid) {
417 conn->smb2.client.guid = *client_guid;
418 }
419 conn->smb2.client.capabilities = smb2_capabilities;
420
421 conn->smb2.cur_credits = 1;
422 conn->smb2.max_credits = 0;
423 conn->smb2.io_priority = 1;
424
425 /*
426 * Samba and Windows servers accept a maximum of 16 MiB with a maximum
427 * chunk length of 1 MiB.
428 */
429 conn->smb2.cc_chunk_len = 1024 * 1024;
430 conn->smb2.cc_max_chunks = 16;
431
432 talloc_set_destructor(conn, smbXcli_conn_destructor);
433 return conn;
434
435 error:
436 TALLOC_FREE(conn);
437 return NULL;
438 }
439
440 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
441 {
442 if (conn == NULL) {
443 return false;
444 }
445
446 if (conn->sock_fd == -1) {
447 return false;
448 }
449
450 return true;
451 }
452
453 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
454 {
455 return conn->protocol;
456 }
457
458 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
459 {
460 if (conn->protocol >= PROTOCOL_SMB2_02) {
461 return true;
462 }
463
464 if (conn->smb1.capabilities & CAP_UNICODE) {
465 return true;
466 }
467
468 return false;
469 }
470
471 /*
472 * [MS-SMB] 2.2.2.3.5 - SMB1 support for passing through
473 * query/set commands to the file system
474 */
475 bool smbXcli_conn_support_passthrough(struct smbXcli_conn *conn)
476 {
477 if (conn->protocol >= PROTOCOL_SMB2_02) {
478 return true;
479 }
480
481 if (conn->smb1.capabilities & CAP_W2K_SMBS) {
482 return true;
483 }
484
485 return false;
486 }
487
488 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
489 {
490 set_socket_options(conn->sock_fd, options);
491 }
492
493 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
494 {
495 return &conn->local_ss;
496 }
497
498 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
499 {
500 return &conn->remote_ss;
501 }
502
503 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
504 {
505 return conn->remote_name;
506 }
507
508 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
509 {
510 if (conn->protocol >= PROTOCOL_SMB2_02) {
511 /*
512 * TODO...
513 */
514 return 1;
515 }
516
517 return conn->smb1.server.max_mux;
518 }
519
520 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
521 {
522 if (conn->protocol >= PROTOCOL_SMB2_02) {
523 return conn->smb2.server.system_time;
524 }
525
526 return conn->smb1.server.system_time;
527 }
528
529 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
530 {
531 if (conn->protocol >= PROTOCOL_SMB2_02) {
532 return &conn->smb2.server.gss_blob;
533 }
534
535 return &conn->smb1.server.gss_blob;
536 }
537
538 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
539 {
540 if (conn->protocol >= PROTOCOL_SMB2_02) {
541 return &conn->smb2.server.guid;
542 }
543
544 return &conn->smb1.server.guid;
545 }
546
547 struct smbXcli_conn_samba_suicide_state {
548 struct smbXcli_conn *conn;
549 struct iovec iov;
550 uint8_t buf[9];
551 struct tevent_req *write_req;
552 };
553
554 static void smbXcli_conn_samba_suicide_cleanup(struct tevent_req *req,
555 enum tevent_req_state req_state);
556 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq);
557
558 struct tevent_req *smbXcli_conn_samba_suicide_send(TALLOC_CTX *mem_ctx,
559 struct tevent_context *ev,
560 struct smbXcli_conn *conn,
561 uint8_t exitcode)
562 {
563 struct tevent_req *req, *subreq;
564 struct smbXcli_conn_samba_suicide_state *state;
565
566 req = tevent_req_create(mem_ctx, &state,
567 struct smbXcli_conn_samba_suicide_state);
568 if (req == NULL) {
569 return NULL;
570 }
571 state->conn = conn;
572 SIVAL(state->buf, 4, 0x74697865);
573 SCVAL(state->buf, 8, exitcode);
574 _smb_setlen_nbt(state->buf, sizeof(state->buf)-4);
575
576 if (conn->suicide_req != NULL) {
577 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
578 return tevent_req_post(req, ev);
579 }
580
581 state->iov.iov_base = state->buf;
582 state->iov.iov_len = sizeof(state->buf);
583
584 subreq = writev_send(state, ev, conn->outgoing, conn->sock_fd,
585 false, &state->iov, 1);
586 if (tevent_req_nomem(subreq, req)) {
587 return tevent_req_post(req, ev);
588 }
589 tevent_req_set_callback(subreq, smbXcli_conn_samba_suicide_done, req);
590 state->write_req = subreq;
591
592 tevent_req_set_cleanup_fn(req, smbXcli_conn_samba_suicide_cleanup);
593
594 /*
595 * We need to use tevent_req_defer_callback()
596 * in order to allow smbXcli_conn_disconnect()
597 * to do a safe cleanup.
598 */
599 tevent_req_defer_callback(req, ev);
600 conn->suicide_req = req;
601
602 return req;
603 }
604
605 static void smbXcli_conn_samba_suicide_cleanup(struct tevent_req *req,
606 enum tevent_req_state req_state)
607 {
608 struct smbXcli_conn_samba_suicide_state *state = tevent_req_data(
609 req, struct smbXcli_conn_samba_suicide_state);
610
611 TALLOC_FREE(state->write_req);
612
613 if (state->conn == NULL) {
614 return;
615 }
616
617 if (state->conn->suicide_req == req) {
618 state->conn->suicide_req = NULL;
619 }
620 state->conn = NULL;
621 }
622
623 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq)
624 {
625 struct tevent_req *req = tevent_req_callback_data(
626 subreq, struct tevent_req);
627 struct smbXcli_conn_samba_suicide_state *state = tevent_req_data(
628 req, struct smbXcli_conn_samba_suicide_state);
629 ssize_t nwritten;
630 int err;
631
632 state->write_req = NULL;
633
634 nwritten = writev_recv(subreq, &err);
635 TALLOC_FREE(subreq);
636 if (nwritten == -1) {
637 /* here, we need to notify all pending requests */
638 NTSTATUS status = map_nt_error_from_unix_common(err);
639 smbXcli_conn_disconnect(state->conn, status);
640 return;
641 }
642 tevent_req_done(req);
643 }
644
645 NTSTATUS smbXcli_conn_samba_suicide_recv(struct tevent_req *req)
646 {
647 return tevent_req_simple_recv_ntstatus(req);
648 }
649
650 NTSTATUS smbXcli_conn_samba_suicide(struct smbXcli_conn *conn,
651 uint8_t exitcode)
652 {
653 TALLOC_CTX *frame = talloc_stackframe();
654 struct tevent_context *ev;
655 struct tevent_req *req;
656 NTSTATUS status = NT_STATUS_NO_MEMORY;
657 bool ok;
658
659 if (smbXcli_conn_has_async_calls(conn)) {
660 /*
661 * Can't use sync call while an async call is in flight
662 */
663 status = NT_STATUS_INVALID_PARAMETER_MIX;
664 goto fail;
665 }
666 ev = samba_tevent_context_init(frame);
667 if (ev == NULL) {
668 goto fail;
669 }
670 req = smbXcli_conn_samba_suicide_send(frame, ev, conn, exitcode);
671 if (req == NULL) {
672 goto fail;
673 }
674 ok = tevent_req_poll_ntstatus(req, ev, &status);
675 if (!ok) {
676 goto fail;
677 }
678 status = smbXcli_conn_samba_suicide_recv(req);
679 fail:
680 TALLOC_FREE(frame);
681 return status;
682 }
683
684 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
685 {
686 return conn->smb1.capabilities;
687 }
688
689 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
690 {
691 return conn->smb1.max_xmit;
692 }
693
694 bool smb1cli_conn_req_possible(struct smbXcli_conn *conn)
695 {
696 size_t pending = talloc_array_length(conn->pending);
697 uint16_t possible = conn->smb1.server.max_mux;
698
699 if (pending >= possible) {
700 return false;
701 }
702
703 return true;
704 }
705
706 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
707 {
708 return conn->smb1.server.session_key;
709 }
710
711 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
712 {
713 return conn->smb1.server.challenge;
714 }
715
716 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
717 {
718 return conn->smb1.server.security_mode;
719 }
720
721 bool smb1cli_conn_server_readbraw(struct smbXcli_conn *conn)
722 {
723 return conn->smb1.server.readbraw;
724 }
725
726 bool smb1cli_conn_server_writebraw(struct smbXcli_conn *conn)
727 {
728 return conn->smb1.server.writebraw;
729 }
730
731 bool smb1cli_conn_server_lockread(struct smbXcli_conn *conn)
732 {
733 return conn->smb1.server.lockread;
734 }
735
736 bool smb1cli_conn_server_writeunlock(struct smbXcli_conn *conn)
737 {
738 return conn->smb1.server.writeunlock;
739 }
740
741 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
742 {
743 return conn->smb1.server.time_zone;
744 }
745
746 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
747 const DATA_BLOB user_session_key,
748 const DATA_BLOB response)
749 {
750 return smb_signing_activate(conn->smb1.signing,
751 user_session_key,
752 response);
753 }
754
755 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
756 const uint8_t *buf, uint32_t seqnum)
757 {
758 const uint8_t *hdr = buf + NBT_HDR_SIZE;
759 size_t len = smb_len_nbt(buf);
760
761 return smb_signing_check_pdu(conn->smb1.signing, hdr, len, seqnum);
762 }
763
764 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
765 {
766 return smb_signing_is_active(conn->smb1.signing);
767 }
768
769 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
770 struct smb_trans_enc_state *es)
771 {
772 /* Replace the old state, if any. */
773 if (conn->smb1.trans_enc) {
774 TALLOC_FREE(conn->smb1.trans_enc);
775 }
776 conn->smb1.trans_enc = es;
777 }
778
779 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
780 {
781 return common_encryption_on(conn->smb1.trans_enc);
782 }
783
784
785 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
786 {
787 uint32_t flags2 = SVAL(hdr, HDR_FLG2);
788 NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
789
790 if (NT_STATUS_IS_OK(status)) {
791 return NT_STATUS_OK;
792 }
793
794 if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
795 return status;
796 }
797
798 return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
799 }
800
801 /**
802 * Is the SMB command able to hold an AND_X successor
803 * @param[in] cmd The SMB command in question
804 * @retval Can we add a chained request after "cmd"?
805 */
806 bool smb1cli_is_andx_req(uint8_t cmd)
807 {
808 switch (cmd) {
809 case SMBtconX:
810 case SMBlockingX:
811 case SMBopenX:
812 case SMBreadX:
813 case SMBwriteX:
814 case SMBsesssetupX:
815 case SMBulogoffX:
816 case SMBntcreateX:
817 return true;
818 break;
819 default:
820 break;
821 }
822
823 return false;
824 }
825
826 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
827 {
828 size_t num_pending = talloc_array_length(conn->pending);
829 uint16_t result;
830
831 if (conn->protocol == PROTOCOL_NONE) {
832 /*
833 * This is what windows sends on the SMB1 Negprot request
834 * and some vendors reuse the SMB1 MID as SMB2 sequence number.
835 */
836 return 0;
837 }
838
839 while (true) {
840 size_t i;
841
842 result = conn->smb1.mid++;
843 if ((result == 0) || (result == 0xffff)) {
844 continue;
845 }
846
847 for (i=0; i<num_pending; i++) {
848 if (result == smb1cli_req_mid(conn->pending[i])) {
849 break;
850 }
851 }
852
853 if (i == num_pending) {
854 return result;
855 }
856 }
857 }
858
859 static NTSTATUS smbXcli_req_cancel_write_req(struct tevent_req *req)
860 {
861 struct smbXcli_req_state *state =
862 tevent_req_data(req,
863 struct smbXcli_req_state);
864 struct smbXcli_conn *conn = state->conn;
865 size_t num_pending = talloc_array_length(conn->pending);
866 ssize_t ret;
867 int err;
868 bool ok;
869
870 if (state->write_req == NULL) {
871 return NT_STATUS_OK;
872 }
873
874 /*
875 * Check if it's possible to cancel the request.
876 * If the result is true it's not to late.
877 * See writev_cancel().
878 */
879 ok = tevent_req_cancel(state->write_req);
880 if (ok) {
881 TALLOC_FREE(state->write_req);
882
883 if (conn->protocol >= PROTOCOL_SMB2_02) {
884 /*
885 * SMB2 has a sane signing state.
886 */
887 return NT_STATUS_OK;
888 }
889
890 if (num_pending > 1) {
891 /*
892 * We have more pending requests following us. This
893 * means the signing state will be broken for them.
894 *
895 * As a solution we could add the requests directly to
896 * our outgoing queue and do the signing in the trigger
897 * function and then use writev_send() without passing a
898 * queue. That way we'll only sign packets we're most
899 * likely send to the wire.
900 */
901 return NT_STATUS_REQUEST_OUT_OF_SEQUENCE;
902 }
903
904 /*
905 * If we're the only request that's
906 * pending, we're able to recover the signing
907 * state.
908 */
909 smb_signing_cancel_reply(conn->smb1.signing,
910 state->smb1.one_way_seqnum);
911 return NT_STATUS_OK;
912 }
913
914 ret = writev_recv(state->write_req, &err);
915 TALLOC_FREE(state->write_req);
916 if (ret == -1) {
917 return map_nt_error_from_unix_common(err);
918 }
919
920 return NT_STATUS_OK;
921 }
922
923 void smbXcli_req_unset_pending(struct tevent_req *req)
924 {
925 struct smbXcli_req_state *state =
926 tevent_req_data(req,
927 struct smbXcli_req_state);
928 struct smbXcli_conn *conn = state->conn;
929 size_t num_pending = talloc_array_length(conn->pending);
930 size_t i;
931 NTSTATUS cancel_status;
932
933 cancel_status = smbXcli_req_cancel_write_req(req);
934
935 if (state->smb1.mid != 0) {
936 /*
937 * This is a [nt]trans[2] request which waits
938 * for more than one reply.
939 */
940 if (!NT_STATUS_IS_OK(cancel_status)) {
941 /*
942 * If the write_req cancel didn't work
943 * we can't use the connection anymore.
944 */
945 smbXcli_conn_disconnect(conn, cancel_status);
946 return;
947 }
948 return;
949 }
950
951 tevent_req_set_cleanup_fn(req, NULL);
952
953 if (num_pending == 1) {
954 /*
955 * The pending read_smb tevent_req is a child of
956 * conn->pending. So if nothing is pending anymore, we need to
957 * delete the socket read fde.
958 */
959 /* TODO: smbXcli_conn_cancel_read_req */
960 TALLOC_FREE(conn->pending);
961 conn->read_smb_req = NULL;
962
963 if (!NT_STATUS_IS_OK(cancel_status)) {
964 /*
965 * If the write_req cancel didn't work
966 * we can't use the connection anymore.
967 */
968 smbXcli_conn_disconnect(conn, cancel_status);
969 return;
970 }
971 return;
972 }
973
974 for (i=0; i<num_pending; i++) {
975 if (req == conn->pending[i]) {
976 break;
977 }
978 }
979 if (i == num_pending) {
980 /*
981 * Something's seriously broken. Just returning here is the
982 * right thing nevertheless, the point of this routine is to
983 * remove ourselves from conn->pending.
984 */
985
986 if (!NT_STATUS_IS_OK(cancel_status)) {
987 /*
988 * If the write_req cancel didn't work
989 * we can't use the connection anymore.
990 */
991 smbXcli_conn_disconnect(conn, cancel_status);
992 return;
993 }
994 return;
995 }
996
997 /*
998 * Remove ourselves from the conn->pending array
999 */
1000 for (; i < (num_pending - 1); i++) {
1001 conn->pending[i] = conn->pending[i+1];
1002 }
1003
1004 /*
1005 * No NULL check here, we're shrinking by sizeof(void *), and
1006 * talloc_realloc just adjusts the size for this.
1007 */
1008 conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
1009 num_pending - 1);
1010
1011 if (!NT_STATUS_IS_OK(cancel_status)) {
1012 /*
1013 * If the write_req cancel didn't work
1014 * we can't use the connection anymore.
1015 */
1016 smbXcli_conn_disconnect(conn, cancel_status);
1017 return;
1018 }
1019 return;
1020 }
1021
1022 static void smbXcli_req_cleanup(struct tevent_req *req,
1023 enum tevent_req_state req_state)
1024 {
1025 struct smbXcli_req_state *state =
1026 tevent_req_data(req,
1027 struct smbXcli_req_state);
1028 struct smbXcli_conn *conn = state->conn;
1029 NTSTATUS cancel_status;
1030
1031 switch (req_state) {
1032 case TEVENT_REQ_RECEIVED:
1033 /*
1034 * Make sure we really remove it from
1035 * the pending array on destruction.
1036 *
1037 * smbXcli_req_unset_pending() calls
1038 * smbXcli_req_cancel_write_req() internal
1039 */
1040 state->smb1.mid = 0;
1041 smbXcli_req_unset_pending(req);
1042 return;
1043 default:
1044 cancel_status = smbXcli_req_cancel_write_req(req);
1045 if (!NT_STATUS_IS_OK(cancel_status)) {
1046 /*
1047 * If the write_req cancel didn't work
1048 * we can't use the connection anymore.
1049 */
1050 smbXcli_conn_disconnect(conn, cancel_status);
1051 return;
1052 }
1053 return;
1054 }
1055 }
1056
1057 static bool smb1cli_req_cancel(struct tevent_req *req);
1058 static bool smb2cli_req_cancel(struct tevent_req *req);
1059
1060 static bool smbXcli_req_cancel(struct tevent_req *req)
1061 {
1062 struct smbXcli_req_state *state =
1063 tevent_req_data(req,
1064 struct smbXcli_req_state);
1065
1066 if (!smbXcli_conn_is_connected(state->conn)) {
1067 return false;
1068 }
1069
1070 if (state->conn->protocol == PROTOCOL_NONE) {
1071 return false;
1072 }
1073
1074 if (state->conn->protocol >= PROTOCOL_SMB2_02) {
1075 return smb2cli_req_cancel(req);
1076 }
1077
1078 return smb1cli_req_cancel(req);
1079 }
1080
1081 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
1082
1083 bool smbXcli_req_set_pending(struct tevent_req *req)
1084 {
1085 struct smbXcli_req_state *state =
1086 tevent_req_data(req,
1087 struct smbXcli_req_state);
1088 struct smbXcli_conn *conn;
1089 struct tevent_req **pending;
1090 size_t num_pending;
1091
1092 conn = state->conn;
1093
1094 if (!smbXcli_conn_is_connected(conn)) {
1095 return false;
1096 }
1097
1098 num_pending = talloc_array_length(conn->pending);
1099
1100 pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
1101 num_pending+1);
1102 if (pending == NULL) {
1103 return false;
1104 }
1105 pending[num_pending] = req;
1106 conn->pending = pending;
1107 tevent_req_set_cleanup_fn(req, smbXcli_req_cleanup);
1108 tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
1109
1110 if (!smbXcli_conn_receive_next(conn)) {
1111 /*
1112 * the caller should notify the current request
1113 *
1114 * And all other pending requests get notified
1115 * by smbXcli_conn_disconnect().
1116 */
1117 smbXcli_req_unset_pending(req);
1118 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1119 return false;
1120 }
1121
1122 return true;
1123 }
1124
1125 static void smbXcli_conn_received(struct tevent_req *subreq);
1126
1127 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
1128 {
1129 size_t num_pending = talloc_array_length(conn->pending);
1130 struct tevent_req *req;
1131 struct smbXcli_req_state *state;
1132
1133 if (conn->read_smb_req != NULL) {
1134 return true;
1135 }
1136
1137 if (num_pending == 0) {
1138 if (conn->smb2.mid < UINT64_MAX) {
1139 /* no more pending requests, so we are done for now */
1140 return true;
1141 }
1142
1143 /*
1144 * If there are no more SMB2 requests possible,
1145 * because we are out of message ids,
1146 * we need to disconnect.
1147 */
1148 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
1149 return true;
1150 }
1151
1152 req = conn->pending[0];
1153 state = tevent_req_data(req, struct smbXcli_req_state);
1154
1155 /*
1156 * We're the first ones, add the read_smb request that waits for the
1157 * answer from the server
1158 */
1159 conn->read_smb_req = read_smb_send(conn->pending,
1160 state->ev,
1161 conn->sock_fd);
1162 if (conn->read_smb_req == NULL) {
1163 return false;
1164 }
1165 tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
1166 return true;
1167 }
1168
1169 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
1170 {
1171 struct smbXcli_session *session;
1172 int sock_fd = conn->sock_fd;
1173
1174 tevent_queue_stop(conn->outgoing);
1175
1176 conn->sock_fd = -1;
1177
1178 session = conn->sessions;
1179 if (talloc_array_length(conn->pending) == 0) {
1180 /*
1181 * if we do not have pending requests
1182 * there is no need to update the channel_sequence
1183 */
1184 session = NULL;
1185 }
1186 for (; session; session = session->next) {
1187 smb2cli_session_increment_channel_sequence(session);
1188 }
1189
1190 if (conn->suicide_req != NULL) {
1191 /*
1192 * smbXcli_conn_samba_suicide_send()
1193 * used tevent_req_defer_callback() already.
1194 */
1195 if (!NT_STATUS_IS_OK(status)) {
1196 tevent_req_nterror(conn->suicide_req, status);
1197 }
1198 conn->suicide_req = NULL;
1199 }
1200
1201 /*
1202 * Cancel all pending requests. We do not do a for-loop walking
1203 * conn->pending because that array changes in
1204 * smbXcli_req_unset_pending.
1205 */
1206 while (talloc_array_length(conn->pending) > 0) {
1207 struct tevent_req *req;
1208 struct smbXcli_req_state *state;
1209 struct tevent_req **chain;
1210 size_t num_chained;
1211 size_t i;
1212
1213 req = conn->pending[0];
1214 state = tevent_req_data(req, struct smbXcli_req_state);
1215
1216 if (state->smb1.chained_requests == NULL) {
1217 bool in_progress;
1218
1219 /*
1220 * We're dead. No point waiting for trans2
1221 * replies.
1222 */
1223 state->smb1.mid = 0;
1224
1225 smbXcli_req_unset_pending(req);
1226
1227 if (NT_STATUS_IS_OK(status)) {
1228 /* do not notify the callers */
1229 continue;
1230 }
1231
1232 in_progress = tevent_req_is_in_progress(req);
1233 if (!in_progress) {
1234 /*
1235 * already finished
1236 */
1237 continue;
1238 }
1239
1240 /*
1241 * we need to defer the callback, because we may notify
1242 * more then one caller.
1243 */
1244 tevent_req_defer_callback(req, state->ev);
1245 tevent_req_nterror(req, status);
1246 continue;
1247 }
1248
1249 chain = talloc_move(conn, &state->smb1.chained_requests);
1250 num_chained = talloc_array_length(chain);
1251
1252 for (i=0; i<num_chained; i++) {
1253 bool in_progress;
1254
1255 req = chain[i];
1256 state = tevent_req_data(req, struct smbXcli_req_state);
1257
1258 /*
1259 * We're dead. No point waiting for trans2
1260 * replies.
1261 */
1262 state->smb1.mid = 0;
1263
1264 smbXcli_req_unset_pending(req);
1265
1266 if (NT_STATUS_IS_OK(status)) {
1267 /* do not notify the callers */
1268 continue;
1269 }
1270
1271 in_progress = tevent_req_is_in_progress(req);
1272 if (!in_progress) {
1273 /*
1274 * already finished
1275 */
1276 continue;
1277 }
1278
1279 /*
1280 * we need to defer the callback, because we may notify
1281 * more than one caller.
1282 */
1283 tevent_req_defer_callback(req, state->ev);
1284 tevent_req_nterror(req, status);
1285 }
1286 TALLOC_FREE(chain);
1287 }
1288
1289 if (sock_fd != -1) {
1290 close(sock_fd);
1291 }
1292 }
1293
1294 /*
1295 * Fetch a smb request's mid. Only valid after the request has been sent by
1296 * smb1cli_req_send().
1297 */
1298 uint16_t smb1cli_req_mid(struct tevent_req *req)
1299 {
1300 struct smbXcli_req_state *state =
1301 tevent_req_data(req,
1302 struct smbXcli_req_state);
1303
1304 if (state->smb1.mid != 0) {
1305 return state->smb1.mid;
1306 }
1307
1308 return SVAL(state->smb1.hdr, HDR_MID);
1309 }
1310
1311 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
1312 {
1313 struct smbXcli_req_state *state =
1314 tevent_req_data(req,
1315 struct smbXcli_req_state);
1316
1317 state->smb1.mid = mid;
1318 }
1319
1320 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
1321 {
1322 struct smbXcli_req_state *state =
1323 tevent_req_data(req,
1324 struct smbXcli_req_state);
1325
1326 return state->smb1.seqnum;
1327 }
1328
1329 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
1330 {
1331 struct smbXcli_req_state *state =
1332 tevent_req_data(req,
1333 struct smbXcli_req_state);
1334
1335 state->smb1.seqnum = seqnum;
1336 }
1337
1338 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
1339 {
1340 ssize_t ret = iov_buflen(iov, count);
1341
1342 /* Ignore the overflow case for now ... */
1343 return ret;
1344 }
1345
1346 static void smb1cli_req_flags(enum protocol_types protocol,
1347 uint32_t smb1_capabilities,
1348 uint8_t smb_command,
1349 uint8_t additional_flags,
1350 uint8_t clear_flags,
1351 uint8_t *_flags,
1352 uint16_t additional_flags2,
1353 uint16_t clear_flags2,
1354 uint16_t *_flags2)
1355 {
1356 uint8_t flags = 0;
1357 uint16_t flags2 = 0;
1358
1359 if (protocol >= PROTOCOL_LANMAN1) {
1360 flags |= FLAG_CASELESS_PATHNAMES;
1361 flags |= FLAG_CANONICAL_PATHNAMES;
1362 }
1363
1364 if (protocol >= PROTOCOL_LANMAN2) {
1365 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
1366 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
1367 }
1368
1369 if (protocol >= PROTOCOL_NT1) {
1370 flags2 |= FLAGS2_IS_LONG_NAME;
1371
1372 if (smb1_capabilities & CAP_UNICODE) {
1373 flags2 |= FLAGS2_UNICODE_STRINGS;
1374 }
1375 if (smb1_capabilities & CAP_STATUS32) {
1376 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
1377 }
1378 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
1379 flags2 |= FLAGS2_EXTENDED_SECURITY;
1380 }
1381 }
1382
1383 flags |= additional_flags;
1384 flags &= ~clear_flags;
1385 flags2 |= additional_flags2;
1386 flags2 &= ~clear_flags2;
1387
1388 *_flags = flags;
1389 *_flags2 = flags2;
1390 }
1391
1392 static void smb1cli_req_cancel_done(struct tevent_req *subreq);
1393
1394 static bool smb1cli_req_cancel(struct tevent_req *req)
1395 {
1396 struct smbXcli_req_state *state =
1397 tevent_req_data(req,
1398 struct smbXcli_req_state);
1399 uint8_t flags;
1400 uint16_t flags2;
1401 uint32_t pid;
1402 uint16_t mid;
1403 struct tevent_req *subreq;
1404 NTSTATUS status;
1405
1406 flags = CVAL(state->smb1.hdr, HDR_FLG);
1407 flags2 = SVAL(state->smb1.hdr, HDR_FLG2);
1408 pid = SVAL(state->smb1.hdr, HDR_PID);
1409 pid |= SVAL(state->smb1.hdr, HDR_PIDHIGH)<<16;
1410 mid = SVAL(state->smb1.hdr, HDR_MID);
1411
1412 subreq = smb1cli_req_create(state, state->ev,
1413 state->conn,
1414 SMBntcancel,
1415 flags, 0,
1416 flags2, 0,
1417 0, /* timeout */
1418 pid,
1419 state->tcon,
1420 state->session,
1421 0, NULL, /* vwv */
1422 0, NULL); /* bytes */
1423 if (subreq == NULL) {
1424 return false;
1425 }
1426 smb1cli_req_set_mid(subreq, mid);
1427
1428 status = smb1cli_req_chain_submit(&subreq, 1);
1429 if (!NT_STATUS_IS_OK(status)) {
1430 TALLOC_FREE(subreq);
1431 return false;
1432 }
1433 smb1cli_req_set_mid(subreq, 0);
1434
1435 tevent_req_set_callback(subreq, smb1cli_req_cancel_done, NULL);
1436
1437 return true;
1438 }
1439
1440 static void smb1cli_req_cancel_done(struct tevent_req *subreq)
1441 {
1442 /* we do not care about the result */
1443 TALLOC_FREE(subreq);
1444 }
1445
1446 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
1447 struct tevent_context *ev,
1448 struct smbXcli_conn *conn,
1449 uint8_t smb_command,
1450 uint8_t additional_flags,
1451 uint8_t clear_flags,
1452 uint16_t additional_flags2,
1453 uint16_t clear_flags2,
1454 uint32_t timeout_msec,
1455 uint32_t pid,
1456 struct smbXcli_tcon *tcon,
1457 struct smbXcli_session *session,
1458 uint8_t wct, uint16_t *vwv,
1459 int iov_count,
1460 struct iovec *bytes_iov)
1461 {
1462 struct tevent_req *req;
1463 struct smbXcli_req_state *state;
1464 uint8_t flags = 0;
1465 uint16_t flags2 = 0;
1466 uint16_t uid = 0;
1467 uint16_t tid = 0;
1468 ssize_t num_bytes;
1469
1470 if (iov_count > MAX_SMB_IOV) {
1471 /*
1472 * Should not happen :-)
1473 */
1474 return NULL;
1475 }
1476
1477 req = tevent_req_create(mem_ctx, &state,
1478 struct smbXcli_req_state);
1479 if (req == NULL) {
1480 return NULL;
1481 }
1482 state->ev = ev;
1483 state->conn = conn;
1484 state->session = session;
1485 state->tcon = tcon;
1486
1487 if (session) {
1488 uid = session->smb1.session_id;
1489 }
1490
1491 if (tcon) {
1492 tid = tcon->smb1.tcon_id;
1493
1494 if (tcon->fs_attributes & FILE_CASE_SENSITIVE_SEARCH) {
1495 clear_flags |= FLAG_CASELESS_PATHNAMES;
1496 } else {
1497 /* Default setting, case insensitive. */
1498 additional_flags |= FLAG_CASELESS_PATHNAMES;
1499 }
1500
1501 if (smbXcli_conn_dfs_supported(conn) &&
1502 smbXcli_tcon_is_dfs_share(tcon))
1503 {
1504 additional_flags2 |= FLAGS2_DFS_PATHNAMES;
1505 }
1506 }
1507
1508 state->smb1.recv_cmd = 0xFF;
1509 state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
1510 state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
1511 if (state->smb1.recv_iov == NULL) {
1512 TALLOC_FREE(req);
1513 return NULL;
1514 }
1515
1516 smb1cli_req_flags(conn->protocol,
1517 conn->smb1.capabilities,
1518 smb_command,
1519 additional_flags,
1520 clear_flags,
1521 &flags,
1522 additional_flags2,
1523 clear_flags2,
1524 &flags2);
1525
1526 SIVAL(state->smb1.hdr, 0, SMB_MAGIC);
1527 SCVAL(state->smb1.hdr, HDR_COM, smb_command);
1528 SIVAL(state->smb1.hdr, HDR_RCLS, NT_STATUS_V(NT_STATUS_OK));
1529 SCVAL(state->smb1.hdr, HDR_FLG, flags);
1530 SSVAL(state->smb1.hdr, HDR_FLG2, flags2);
1531 SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
1532 SSVAL(state->smb1.hdr, HDR_TID, tid);
1533 SSVAL(state->smb1.hdr, HDR_PID, pid);
1534 SSVAL(state->smb1.hdr, HDR_UID, uid);
1535 SSVAL(state->smb1.hdr, HDR_MID, 0); /* this comes later */
1536 SCVAL(state->smb1.hdr, HDR_WCT, wct);
1537
1538 state->smb1.vwv = vwv;
1539
1540 num_bytes = iov_buflen(bytes_iov, iov_count);
1541 if (num_bytes == -1) {
1542 /*
1543 * I'd love to add a check for num_bytes<=UINT16_MAX here, but
1544 * the smbclient->samba connections can lie and transfer more.
1545 */
1546 TALLOC_FREE(req);
1547 return NULL;
1548 }
1549
1550 SSVAL(state->smb1.bytecount_buf, 0, num_bytes);
1551
1552 state->smb1.iov[0].iov_base = (void *)state->length_hdr;
1553 state->smb1.iov[0].iov_len = sizeof(state->length_hdr);
1554 state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
1555 state->smb1.iov[1].iov_len = sizeof(state->smb1.hdr);
1556 state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
1557 state->smb1.iov[2].iov_len = wct * sizeof(uint16_t);
1558 state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
1559 state->smb1.iov[3].iov_len = sizeof(uint16_t);
1560
1561 if (iov_count != 0) {
1562 memcpy(&state->smb1.iov[4], bytes_iov,
1563 iov_count * sizeof(*bytes_iov));
1564 }
1565 state->smb1.iov_count = iov_count + 4;
1566
1567 if (timeout_msec > 0) {
1568 struct timeval endtime;
1569
1570 endtime = timeval_current_ofs_msec(timeout_msec);
1571 if (!tevent_req_set_endtime(req, ev, endtime)) {
1572 return req;
1573 }
1574 }
1575
1576 switch (smb_command) {
1577 case SMBtranss:
1578 case SMBtranss2:
1579 case SMBnttranss:
1580 state->one_way = true;
1581 break;
1582 case SMBntcancel:
1583 state->one_way = true;
1584 state->smb1.one_way_seqnum = true;
1585 break;
1586 case SMBlockingX:
1587 if ((wct == 8) &&
1588 (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1589 state->one_way = true;
1590 }
1591 break;
1592 }
1593
1594 return req;
1595 }
1596
1597 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1598 struct iovec *iov, int iov_count,
1599 uint32_t *seqnum,
1600 bool one_way_seqnum)
1601 {
1602 TALLOC_CTX *frame = NULL;
1603 uint8_t *buf;
1604
1605 /*
1606 * Obvious optimization: Make cli_calculate_sign_mac work with struct
1607 * iovec directly. MD5Update would do that just fine.
1608 */
1609
1610 if (iov_count < 4) {
1611 return NT_STATUS_INVALID_PARAMETER_MIX;
1612 }
1613 if (iov[0].iov_len != NBT_HDR_SIZE) {
1614 return NT_STATUS_INVALID_PARAMETER_MIX;
1615 }
1616 if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1617 return NT_STATUS_INVALID_PARAMETER_MIX;
1618 }
1619 if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1620 return NT_STATUS_INVALID_PARAMETER_MIX;
1621 }
1622 if (iov[3].iov_len != sizeof(uint16_t)) {
1623 return NT_STATUS_INVALID_PARAMETER_MIX;
1624 }
1625
1626 frame = talloc_stackframe();
1627
1628 buf = iov_concat(frame, &iov[1], iov_count - 1);
1629 if (buf == NULL) {
1630 return NT_STATUS_NO_MEMORY;
1631 }
1632
1633 *seqnum = smb_signing_next_seqnum(conn->smb1.signing,
1634 one_way_seqnum);
1635 smb_signing_sign_pdu(conn->smb1.signing,
1636 buf, talloc_get_size(buf),
1637 *seqnum);
1638 memcpy(iov[1].iov_base, buf, iov[1].iov_len);
1639
1640 TALLOC_FREE(frame);
1641 return NT_STATUS_OK;
1642 }
1643
1644 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1645 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1646 TALLOC_CTX *tmp_mem,
1647 uint8_t *inbuf);
1648
1649 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1650 struct smbXcli_req_state *state,
1651 struct iovec *iov, int iov_count)
1652 {
1653 struct tevent_req *subreq;
1654 NTSTATUS status;
1655 uint8_t cmd;
1656 uint16_t mid;
1657 ssize_t nbtlen;
1658
1659 if (!smbXcli_conn_is_connected(state->conn)) {
1660 return NT_STATUS_CONNECTION_DISCONNECTED;
1661 }
1662
1663 if (state->conn->protocol > PROTOCOL_NT1) {
1664 DBG_ERR("called for dialect[%s] server[%s]\n",
1665 smb_protocol_types_string(state->conn->protocol),
1666 smbXcli_conn_remote_name(state->conn));
1667 return NT_STATUS_REVISION_MISMATCH;
1668 }
1669
1670 if (iov_count < 4) {
1671 return NT_STATUS_INVALID_PARAMETER_MIX;
1672 }
1673 if (iov[0].iov_len != NBT_HDR_SIZE) {
1674 return NT_STATUS_INVALID_PARAMETER_MIX;
1675 }
1676 if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1677 return NT_STATUS_INVALID_PARAMETER_MIX;
1678 }
1679 if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1680 return NT_STATUS_INVALID_PARAMETER_MIX;
1681 }
1682 if (iov[3].iov_len != sizeof(uint16_t)) {
1683 return NT_STATUS_INVALID_PARAMETER_MIX;
1684 }
1685
1686 cmd = CVAL(iov[1].iov_base, HDR_COM);
1687 if (cmd == SMBreadBraw) {
1688 if (smbXcli_conn_has_async_calls(state->conn)) {
1689 return NT_STATUS_INVALID_PARAMETER_MIX;
1690 }
1691 state->conn->smb1.read_braw_req = req;
1692 }
1693
1694 if (state->smb1.mid != 0) {
1695 mid = state->smb1.mid;
1696 } else {
1697 mid = smb1cli_alloc_mid(state->conn);
1698 }
1699 SSVAL(iov[1].iov_base, HDR_MID, mid);
1700
1701 nbtlen = iov_buflen(&iov[1], iov_count-1);
1702 if ((nbtlen == -1) || (nbtlen > 0x1FFFF)) {
1703 return NT_STATUS_INVALID_PARAMETER_MIX;
1704 }
1705
1706 _smb_setlen_nbt(iov[0].iov_base, nbtlen);
1707
1708 status = smb1cli_conn_signv(state->conn, iov, iov_count,
1709 &state->smb1.seqnum,
1710 state->smb1.one_way_seqnum);
1711
1712 if (!NT_STATUS_IS_OK(status)) {
1713 return status;
1714 }
1715
1716 /*
1717 * If we supported multiple encrytion contexts
1718 * here we'd look up based on tid.
1719 */
1720 if (common_encryption_on(state->conn->smb1.trans_enc)) {
1721 char *buf, *enc_buf;
1722
1723 buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
1724 if (buf == NULL) {
1725 return NT_STATUS_NO_MEMORY;
1726 }
1727 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1728 (char *)buf, &enc_buf);
1729 TALLOC_FREE(buf);
1730 if (!NT_STATUS_IS_OK(status)) {
1731 DEBUG(0, ("Error in encrypting client message: %s\n",
1732 nt_errstr(status)));
1733 return status;
1734 }
1735 buf = (char *)talloc_memdup(state, enc_buf,
1736 smb_len_nbt(enc_buf)+4);
1737 SAFE_FREE(enc_buf);
1738 if (buf == NULL) {
1739 return NT_STATUS_NO_MEMORY;
1740 }
1741 iov[0].iov_base = (void *)buf;
1742 iov[0].iov_len = talloc_get_size(buf);
1743 iov_count = 1;
1744 }
1745
1746 if (state->conn->dispatch_incoming == NULL) {
1747 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1748 }
1749
1750 if (!smbXcli_req_set_pending(req)) {
1751 return NT_STATUS_NO_MEMORY;
1752 }
1753
1754 tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
1755
1756 subreq = writev_send(state, state->ev, state->conn->outgoing,
1757 state->conn->sock_fd, false, iov, iov_count);
1758 if (subreq == NULL) {
1759 return NT_STATUS_NO_MEMORY;
1760 }
1761 tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1762 state->write_req = subreq;
1763
1764 return NT_STATUS_OK;
1765 }
1766
1767 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1768 struct tevent_context *ev,
1769 struct smbXcli_conn *conn,
1770 uint8_t smb_command,
1771 uint8_t additional_flags,
1772 uint8_t clear_flags,
1773 uint16_t additional_flags2,
1774 uint16_t clear_flags2,
1775 uint32_t timeout_msec,
1776 uint32_t pid,
1777 struct smbXcli_tcon *tcon,
1778 struct smbXcli_session *session,
1779 uint8_t wct, uint16_t *vwv,
1780 uint32_t num_bytes,
1781 const uint8_t *bytes)
1782 {
1783 struct tevent_req *req;
1784 struct iovec iov;
1785 NTSTATUS status;
1786
1787 iov.iov_base = discard_const_p(void, bytes);
1788 iov.iov_len = num_bytes;
1789
1790 req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1791 additional_flags, clear_flags,
1792 additional_flags2, clear_flags2,
1793 timeout_msec,
1794 pid, tcon, session,
1795 wct, vwv, 1, &iov);
1796 if (req == NULL) {
1797 return NULL;
1798 }
1799 if (!tevent_req_is_in_progress(req)) {
1800 return tevent_req_post(req, ev);
1801 }
1802 status = smb1cli_req_chain_submit(&req, 1);
1803 if (tevent_req_nterror(req, status)) {
1804 return tevent_req_post(req, ev);
1805 }
1806 return req;
1807 }
1808
1809 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1810 {
1811 struct tevent_req *req =
1812 tevent_req_callback_data(subreq,
1813 struct tevent_req);
1814 struct smbXcli_req_state *state =
1815 tevent_req_data(req,
1816 struct smbXcli_req_state);
1817 ssize_t nwritten;
1818 int err;
1819
1820 state->write_req = NULL;
1821
1822 nwritten = writev_recv(subreq, &err);
1823 TALLOC_FREE(subreq);
1824 if (nwritten == -1) {
1825 /* here, we need to notify all pending requests */
1826 NTSTATUS status = map_nt_error_from_unix_common(err);
1827 smbXcli_conn_disconnect(state->conn, status);
1828 return;
1829 }
1830
1831 if (state->one_way) {
1832 state->inbuf = NULL;
1833 tevent_req_done(req);
1834 return;
1835 }
1836 }
1837
1838 static void smbXcli_conn_received(struct tevent_req *subreq)
1839 {
1840 struct smbXcli_conn *conn =
1841 tevent_req_callback_data(subreq,
1842 struct smbXcli_conn);
1843 TALLOC_CTX *frame = talloc_stackframe();
1844 NTSTATUS status;
1845 uint8_t *inbuf;
1846 ssize_t received;
1847 int err;
1848
1849 if (subreq != conn->read_smb_req) {
1850 DEBUG(1, ("Internal error: cli_smb_received called with "
1851 "unexpected subreq\n"));
1852 smbXcli_conn_disconnect(conn, NT_STATUS_INTERNAL_ERROR);
1853 TALLOC_FREE(frame);
1854 return;
1855 }
1856 conn->read_smb_req = NULL;
1857
1858 received = read_smb_recv(subreq, frame, &inbuf, &err);
1859 TALLOC_FREE(subreq);
1860 if (received == -1) {
1861 status = map_nt_error_from_unix_common(err);
1862 smbXcli_conn_disconnect(conn, status);
1863 TALLOC_FREE(frame);
1864 return;
1865 }
1866
1867 status = conn->dispatch_incoming(conn, frame, inbuf);
1868 TALLOC_FREE(frame);
1869 if (NT_STATUS_IS_OK(status)) {
1870 /*
1871 * We should not do any more processing
1872 * as the dispatch function called
1873 * tevent_req_done().
1874 */
1875 return;
1876 }
1877
1878 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1879 /*
1880 * We got an error, so notify all pending requests
1881 */
1882 smbXcli_conn_disconnect(conn, status);
1883 return;
1884 }
1885
1886 /*
1887 * We got NT_STATUS_RETRY, so we may ask for a
1888 * next incoming pdu.
1889 */
1890 if (!smbXcli_conn_receive_next(conn)) {
1891 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1892 }
1893 }
1894
1895 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1896 struct iovec **piov, int *pnum_iov)
1897 {
1898 struct iovec *iov;
1899 int num_iov;
1900 size_t buflen;
1901 size_t taken;
1902 size_t remaining;
1903 uint8_t *hdr;
1904 uint8_t cmd;
1905 uint32_t wct_ofs;
1906 NTSTATUS status;
1907 size_t min_size = MIN_SMB_SIZE;
1908
1909 buflen = smb_len_tcp(buf);
1910 taken = 0;
1911
1912 hdr = buf + NBT_HDR_SIZE;
1913
1914 status = smb1cli_pull_raw_error(hdr);
1915 if (NT_STATUS_IS_ERR(status)) {
1916 /*
1917 * This is an ugly hack to support OS/2
1918 * which skips the byte_count in the DATA block
1919 * on some error responses.
1920 *
1921 * See bug #9096
1922 */
1923 min_size -= sizeof(uint16_t);
1924 }
1925
1926 if (buflen < min_size) {
1927 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1928 }
1929
1930 /*
1931 * This returns iovec elements in the following order:
1932 *
1933 * - SMB header
1934 *
1935 * - Parameter Block
1936 * - Data Block
1937 *
1938 * - Parameter Block
1939 * - Data Block
1940 *
1941 * - Parameter Block
1942 * - Data Block
1943 */
1944 num_iov = 1;
1945
1946 iov = talloc_array(mem_ctx, struct iovec, num_iov);
1947 if (iov == NULL) {
1948 return NT_STATUS_NO_MEMORY;
1949 }
1950 iov[0].iov_base = hdr;
1951 iov[0].iov_len = HDR_WCT;
1952 taken += HDR_WCT;
1953
1954 cmd = CVAL(hdr, HDR_COM);
1955 wct_ofs = HDR_WCT;
1956
1957 while (true) {
1958 size_t len = buflen - taken;
1959 struct iovec *cur;
1960 struct iovec *iov_tmp;
1961 uint8_t wct;
1962 uint32_t bcc_ofs;
1963 uint16_t bcc;
1964 size_t needed;
1965
1966 /*
1967 * we need at least WCT
1968 */
1969 needed = sizeof(uint8_t);
1970 if (len < needed) {
1971 DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1972 __location__, (int)len, (int)needed));
1973 goto inval;
1974 }
1975
1976 /*
1977 * Now we check if the specified words are there
1978 */
1979 wct = CVAL(hdr, wct_ofs);
1980 needed += wct * sizeof(uint16_t);
1981 if (len < needed) {
1982 DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1983 __location__, (int)len, (int)needed));
1984 goto inval;
1985 }
1986
1987 if ((num_iov == 1) &&
1988 (len == needed) &&
1989 NT_STATUS_IS_ERR(status))
1990 {
1991 /*
1992 * This is an ugly hack to support OS/2
1993 * which skips the byte_count in the DATA block
1994 * on some error responses.
1995 *
1996 * See bug #9096
1997 */
1998 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1999 num_iov + 2);
2000 if (iov_tmp == NULL) {
2001 TALLOC_FREE(iov);
2002 return NT_STATUS_NO_MEMORY;
2003 }
2004 iov = iov_tmp;
2005 cur = &iov[num_iov];
2006 num_iov += 2;
2007
2008 cur[0].iov_len = 0;
2009 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
2010 cur[1].iov_len = 0;
2011 cur[1].iov_base = cur[0].iov_base;
2012
2013 taken += needed;
2014 break;
2015 }
2016
2017 /*
2018 * we need at least BCC
2019 */
2020 needed += sizeof(uint16_t);
2021 if (len < needed) {
2022 DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
2023 __location__, (int)len, (int)needed));
2024 goto inval;
2025 }
2026
2027 /*
2028 * Now we check if the specified bytes are there
2029 */
2030 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
2031 bcc = SVAL(hdr, bcc_ofs);
2032 needed += bcc * sizeof(uint8_t);
2033 if (len < needed) {
2034 DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
2035 __location__, (int)len, (int)needed));
2036 goto inval;
2037 }
2038
2039 /*
2040 * we allocate 2 iovec structures for words and bytes
2041 */
2042 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
2043 num_iov + 2);
2044 if (iov_tmp == NULL) {
2045 TALLOC_FREE(iov);
2046 return NT_STATUS_NO_MEMORY;
2047 }
2048 iov = iov_tmp;
2049 cur = &iov[num_iov];
2050 num_iov += 2;
2051
2052 cur[0].iov_len = wct * sizeof(uint16_t);
2053 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
2054 cur[1].iov_len = bcc * sizeof(uint8_t);
2055 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
2056
2057 taken += needed;
2058
2059 if (!smb1cli_is_andx_req(cmd)) {
2060 /*
2061 * If the current command does not have AndX chanining
2062 * we are done.
2063 */
2064 break;
2065 }
2066
2067 if (wct == 0 && bcc == 0) {
2068 /*
2069 * An empty response also ends the chain,
2070 * most likely with an error.
2071 */
2072 break;
2073 }
2074
2075 if (wct < 2) {
2076 DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
2077 __location__, (int)wct, (int)cmd));
2078 goto inval;
2079 }
2080 cmd = CVAL(cur[0].iov_base, 0);
2081 if (cmd == 0xFF) {
2082 /*
2083 * If it is the end of the chain we are also done.
2084 */
2085 break;
2086 }
2087 wct_ofs = SVAL(cur[0].iov_base, 2);
2088
2089 if (wct_ofs < taken) {
2090 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2091 }
2092 if (wct_ofs > buflen) {
2093 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2094 }
2095
2096 /*
2097 * we consumed everything up to the start of the next
2098 * parameter block.
2099 */
2100 taken = wct_ofs;
2101 }
2102
2103 remaining = buflen - taken;
2104
2105 if (remaining > 0 && num_iov >= 3) {
2106 /*
2107 * The last DATA block gets the remaining
2108 * bytes, this is needed to support
2109 * CAP_LARGE_WRITEX and CAP_LARGE_READX.
2110 */
2111 iov[num_iov-1].iov_len += remaining;
2112 }
2113
2114 *piov = iov;
2115 *pnum_iov = num_iov;
2116 return NT_STATUS_OK;
2117
2118 inval:
2119 TALLOC_FREE(iov);
2120 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2121 }
2122
2123 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2124 TALLOC_CTX *tmp_mem,
2125 uint8_t *inbuf)
2126 {
2127 struct tevent_req *req;
2128 struct smbXcli_req_state *state;
2129 NTSTATUS status;
2130 size_t num_pending;
2131 size_t i;
2132 uint8_t cmd;
2133 uint16_t mid;
2134 bool oplock_break;
2135 uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
2136 size_t len = smb_len_tcp(inbuf);
2137 struct iovec *iov = NULL;
2138 int num_iov = 0;
2139 struct tevent_req **chain = NULL;
2140 size_t num_chained = 0;
2141 size_t num_responses = 0;
2142
2143 if (conn->smb1.read_braw_req != NULL) {
2144 req = conn->smb1.read_braw_req;
2145 conn->smb1.read_braw_req = NULL;
2146 state = tevent_req_data(req, struct smbXcli_req_state);
2147
2148 smbXcli_req_unset_pending(req);
2149
2150 if (state->smb1.recv_iov == NULL) {
2151 /*
2152 * For requests with more than
2153 * one response, we have to readd the
2154 * recv_iov array.
2155 */
2156 state->smb1.recv_iov = talloc_zero_array(state,
2157 struct iovec,
2158 3);
2159 if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2160 return NT_STATUS_OK;
2161 }
2162 }
2163
2164 state->smb1.recv_iov[0].iov_base = (void *)(inhdr);
2165 state->smb1.recv_iov[0].iov_len = len;
2166 ZERO_STRUCT(state->smb1.recv_iov[1]);
2167 ZERO_STRUCT(state->smb1.recv_iov[2]);
2168
2169 state->smb1.recv_cmd = SMBreadBraw;
2170 state->smb1.recv_status = NT_STATUS_OK;
2171 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
2172
2173 tevent_req_done(req);
2174 return NT_STATUS_OK;
2175 }
2176
2177 if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
2178 && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
2179 DEBUG(10, ("Got non-SMB PDU\n"));
2180 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2181 }
2182
2183 /*
2184 * If we supported multiple encrytion contexts
2185 * here we'd look up based on tid.
2186 */
2187 if (common_encryption_on(conn->smb1.trans_enc)
2188 && (CVAL(inbuf, 0) == 0)) {
2189 uint16_t enc_ctx_num;
2190
2191 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
2192 if (!NT_STATUS_IS_OK(status)) {
2193 DEBUG(10, ("get_enc_ctx_num returned %s\n",
2194 nt_errstr(status)));
2195 return status;
2196 }
2197
2198 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
2199 DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
2200 enc_ctx_num,
2201 conn->smb1.trans_enc->enc_ctx_num));
2202 return NT_STATUS_INVALID_HANDLE;
2203 }
2204
2205 status = common_decrypt_buffer(conn->smb1.trans_enc,
2206 (char *)inbuf);
2207 if (!NT_STATUS_IS_OK(status)) {
2208 DEBUG(10, ("common_decrypt_buffer returned %s\n",
2209 nt_errstr(status)));
2210 return status;
2211 }
2212 inhdr = inbuf + NBT_HDR_SIZE;
2213 len = smb_len_nbt(inbuf);
2214 }
2215
2216 mid = SVAL(inhdr, HDR_MID);
2217 num_pending = talloc_array_length(conn->pending);
2218
2219 for (i=0; i<num_pending; i++) {
2220 if (mid == smb1cli_req_mid(conn->pending[i])) {
2221 break;
2222 }
2223 }
2224 if (i == num_pending) {
2225 /* Dump unexpected reply */
2226 return NT_STATUS_RETRY;
2227 }
2228
2229 oplock_break = false;
2230
2231 if (mid == 0xffff) {
2232 /*
2233 * Paranoia checks that this is really an oplock break request.
2234 */
2235 oplock_break = (len == 51); /* hdr + 8 words */
2236 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
2237 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
2238 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
2239 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
2240
2241 if (!oplock_break) {
2242 /* Dump unexpected reply */
2243 return NT_STATUS_RETRY;
2244 }
2245 }
2246
2247 req = conn->pending[i];
2248 state = tevent_req_data(req, struct smbXcli_req_state);
2249
2250 if (!oplock_break /* oplock breaks are not signed */
2251 && !smb_signing_check_pdu(conn->smb1.signing,
2252 inhdr, len, state->smb1.seqnum+1)) {
2253 DEBUG(10, ("cli_check_sign_mac failed\n"));
2254 return NT_STATUS_ACCESS_DENIED;
2255 }
2256
2257 status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
2258 &iov, &num_iov);
2259 if (!NT_STATUS_IS_OK(status)) {
2260 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
2261 nt_errstr(status)));
2262 return status;
2263 }
2264
2265 cmd = CVAL(inhdr, HDR_COM);
2266 status = smb1cli_pull_raw_error(inhdr);
2267
2268 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
2269 (state->session != NULL) && state->session->disconnect_expired)
2270 {
2271 /*
2272 * this should be a short term hack
2273 * until the upper layers have implemented
2274 * re-authentication.
2275 */
2276 return status;
2277 }
2278
2279 if (state->smb1.chained_requests == NULL) {
2280 if (num_iov != 3) {
2281 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2282 }
2283
2284 smbXcli_req_unset_pending(req);
2285
2286 if (state->smb1.recv_iov == NULL) {
2287 /*
2288 * For requests with more than
2289 * one response, we have to readd the
2290 * recv_iov array.
2291 */
2292 state->smb1.recv_iov = talloc_zero_array(state,
2293 struct iovec,
2294 3);
2295 if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2296 return NT_STATUS_OK;
2297 }
2298 }
2299
2300 state->smb1.recv_cmd = cmd;
2301 state->smb1.recv_status = status;
2302 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
2303
2304 state->smb1.recv_iov[0] = iov[0];
2305 state->smb1.recv_iov[1] = iov[1];
2306 state->smb1.recv_iov[2] = iov[2];
2307
2308 if (talloc_array_length(conn->pending) == 0) {
2309 tevent_req_done(req);
2310 return NT_STATUS_OK;
2311 }
2312
2313 tevent_req_defer_callback(req, state->ev);
2314 tevent_req_done(req);
2315 return NT_STATUS_RETRY;
2316 }
2317
2318 chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
2319 num_chained = talloc_array_length(chain);
2320 num_responses = (num_iov - 1)/2;
2321
2322 if (num_responses > num_chained) {
2323 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2324 }
2325
2326 for (i=0; i<num_chained; i++) {
2327 size_t iov_idx = 1 + (i*2);
2328 struct iovec *cur = &iov[iov_idx];
2329 uint8_t *inbuf_ref;
2330
2331 req = chain[i];
2332 state = tevent_req_data(req, struct smbXcli_req_state);
2333
2334 smbXcli_req_unset_pending(req);
2335
2336 /*
2337 * as we finish multiple requests here
2338 * we need to defer the callbacks as
2339 * they could destroy our current stack state.
2340 */
2341 tevent_req_defer_callback(req, state->ev);
2342
2343 if (i >= num_responses) {
2344 tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
2345 continue;
2346 }
2347
2348 if (state->smb1.recv_iov == NULL) {
2349 /*
2350 * For requests with more than
2351 * one response, we have to readd the
2352 * recv_iov array.
2353 */
2354 state->smb1.recv_iov = talloc_zero_array(state,
2355 struct iovec,
2356 3);
2357 if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2358 continue;
2359 }
2360 }
2361
2362 state->smb1.recv_cmd = cmd;
2363
2364 if (i == (num_responses - 1)) {
2365 /*
2366 * The last request in the chain gets the status
2367 */
2368 state->smb1.recv_status = status;
2369 } else {
2370 cmd = CVAL(cur[0].iov_base, 0);
2371 state->smb1.recv_status = NT_STATUS_OK;
2372 }
2373
2374 state->inbuf = inbuf;
2375
2376 /*
2377 * Note: here we use talloc_reference() in a way
2378 * that does not expose it to the caller.
2379 */
2380 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
2381 if (tevent_req_nomem(inbuf_ref, req)) {
2382 continue;
2383 }
2384
2385 /* copy the related buffers */
2386 state->smb1.recv_iov[0] = iov[0];
2387 state->smb1.recv_iov[1] = cur[0];
2388 state->smb1.recv_iov[2] = cur[1];
2389
2390 tevent_req_done(req);
2391 }
2392
2393 return NT_STATUS_RETRY;
2394 }
2395
2396 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
2397 TALLOC_CTX *mem_ctx,
2398 struct iovec **piov,
2399 uint8_t **phdr,
2400 uint8_t *pwct,
2401 uint16_t **pvwv,
2402 uint32_t *pvwv_offset,
2403 uint32_t *pnum_bytes,
2404 uint8_t **pbytes,
2405 uint32_t *pbytes_offset,
2406 uint8_t **pinbuf,
2407 const struct smb1cli_req_expected_response *expected,
2408 size_t num_expected)
2409 {
2410 struct smbXcli_req_state *state =
2411 tevent_req_data(req,
2412 struct smbXcli_req_state);
2413 NTSTATUS status = NT_STATUS_OK;
2414 struct iovec *recv_iov = NULL;
2415 uint8_t *hdr = NULL;
2416 uint8_t wct = 0;
2417 uint32_t vwv_offset = 0;
2418 uint16_t *vwv = NULL;
2419 uint32_t num_bytes = 0;
2420 uint32_t bytes_offset = 0;
2421 uint8_t *bytes = NULL;
2422 size_t i;
2423 bool found_status = false;
2424 bool found_size = false;
2425
2426 if (piov != NULL) {
2427 *piov = NULL;
2428 }
2429 if (phdr != NULL) {
2430 *phdr = 0;
2431 }
2432 if (pwct != NULL) {
2433 *pwct = 0;
2434 }
2435 if (pvwv != NULL) {
2436 *pvwv = NULL;
2437 }
2438 if (pvwv_offset != NULL) {
2439 *pvwv_offset = 0;
2440 }
2441 if (pnum_bytes != NULL) {
2442 *pnum_bytes = 0;
2443 }
2444 if (pbytes != NULL) {
2445 *pbytes = NULL;
2446 }
2447 if (pbytes_offset != NULL) {
2448 *pbytes_offset = 0;
2449 }
2450 if (pinbuf != NULL) {
2451 *pinbuf = NULL;
2452 }
2453
2454 if (state->inbuf != NULL) {
2455 recv_iov = state->smb1.recv_iov;
2456 state->smb1.recv_iov = NULL;
2457 if (state->smb1.recv_cmd != SMBreadBraw) {
2458 hdr = (uint8_t *)recv_iov[0].iov_base;
2459 wct = recv_iov[1].iov_len/2;
2460 vwv = (uint16_t *)recv_iov[1].iov_base;
2461 vwv_offset = PTR_DIFF(vwv, hdr);
2462 num_bytes = recv_iov[2].iov_len;
2463 bytes = (uint8_t *)recv_iov[2].iov_base;
2464 bytes_offset = PTR_DIFF(bytes, hdr);
2465 }
2466 }
2467
2468 if (tevent_req_is_nterror(req, &status)) {
2469 for (i=0; i < num_expected; i++) {
2470 if (NT_STATUS_EQUAL(status, expected[i].status)) {
2471 found_status = true;
2472 break;
2473 }
2474 }
2475
2476 if (found_status) {
2477 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2478 }
2479
2480 return status;
2481 }
2482
2483 if (num_expected == 0) {
2484 found_status = true;
2485 found_size = true;
2486 }
2487
2488 status = state->smb1.recv_status;
2489
2490 for (i=0; i < num_expected; i++) {
2491 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2492 continue;
2493 }
2494
2495 found_status = true;
2496 if (expected[i].wct == 0) {
2497 found_size = true;
2498 break;
2499 }
2500
2501 if (expected[i].wct == wct) {
2502 found_size = true;
2503 break;
2504 }
2505 }
2506
2507 if (!found_status) {
2508 return status;
2509 }
2510
2511 if (!found_size) {
2512 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2513 }
2514
2515 if (piov != NULL) {
2516 *piov = talloc_move(mem_ctx, &recv_iov);
2517 }
2518
2519 if (phdr != NULL) {
2520 *phdr = hdr;
2521 }
2522 if (pwct != NULL) {
2523 *pwct = wct;
2524 }
2525 if (pvwv != NULL) {
2526 *pvwv = vwv;
2527 }
2528 if (pvwv_offset != NULL) {
2529 *pvwv_offset = vwv_offset;
2530 }
2531 if (pnum_bytes != NULL) {
2532 *pnum_bytes = num_bytes;
2533 }
2534 if (pbytes != NULL) {
2535 *pbytes = bytes;
2536 }
2537 if (pbytes_offset != NULL) {
2538 *pbytes_offset = bytes_offset;
2539 }
2540 if (pinbuf != NULL) {
2541 *pinbuf = state->inbuf;
2542 }
2543
2544 return status;
2545 }
2546
2547 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
2548 {
2549 size_t wct_ofs;
2550 int i;
2551
2552 wct_ofs = HDR_WCT;
2553
2554 for (i=0; i<num_reqs; i++) {
2555 struct smbXcli_req_state *state;
2556 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2557 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
2558 state->smb1.iov_count-2);
2559 wct_ofs = (wct_ofs + 3) & ~3;
2560 }
2561 return wct_ofs;
2562 }
2563
2564 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
2565 {
2566 struct smbXcli_req_state *first_state =
2567 tevent_req_data(reqs[0],
2568 struct smbXcli_req_state);
2569 struct smbXcli_req_state *state;
2570 size_t wct_offset;
2571 size_t chain_padding = 0;
2572 int i, iovlen;
2573 struct iovec *iov = NULL;
2574 struct iovec *this_iov;
2575 NTSTATUS status;
2576 ssize_t nbt_len;
2577
2578 if (num_reqs == 1) {
2579 return smb1cli_req_writev_submit(reqs[0], first_state,
2580 first_state->smb1.iov,
2581 first_state->smb1.iov_count);
2582 }
2583
2584 iovlen = 0;
2585 for (i=0; i<num_reqs; i++) {
2586 if (!tevent_req_is_in_progress(reqs[i])) {
2587 return NT_STATUS_INTERNAL_ERROR;
2588 }
2589
2590 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2591
2592 if (state->smb1.iov_count < 4) {
2593 return NT_STATUS_INVALID_PARAMETER_MIX;
2594 }
2595
2596 if (i == 0) {
2597 /*
2598 * The NBT and SMB header
2599 */
2600 iovlen += 2;
2601 } else {
2602 /*
2603 * Chain padding
2604 */
2605 iovlen += 1;
2606 }
2607
2608 /*
2609 * words and bytes
2610 */
2611 iovlen += state->smb1.iov_count - 2;
2612 }
2613
2614 iov = talloc_zero_array(first_state, struct iovec, iovlen);
2615 if (iov == NULL) {
2616 return NT_STATUS_NO_MEMORY;
2617 }
2618
2619 first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
2620 first_state, reqs, sizeof(*reqs) * num_reqs);
2621 if (first_state->smb1.chained_requests == NULL) {
2622 TALLOC_FREE(iov);
2623 return NT_STATUS_NO_MEMORY;
2624 }
2625
2626 wct_offset = HDR_WCT;
2627 this_iov = iov;
2628
2629 for (i=0; i<num_reqs; i++) {
2630 size_t next_padding = 0;
2631 uint16_t *vwv;
2632
2633 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2634
2635 if (i < num_reqs-1) {
2636 if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
2637 || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
2638 TALLOC_FREE(iov);
2639 TALLOC_FREE(first_state->smb1.chained_requests);
2640 return NT_STATUS_INVALID_PARAMETER_MIX;
2641 }
2642 }
2643
2644 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
2645 state->smb1.iov_count-2) + 1;
2646 if ((wct_offset % 4) != 0) {
2647 next_padding = 4 - (wct_offset % 4);
2648 }
2649 wct_offset += next_padding;
2650 vwv = state->smb1.vwv;
2651
2652 if (i < num_reqs-1) {
2653 struct smbXcli_req_state *next_state =
2654 tevent_req_data(reqs[i+1],
2655 struct smbXcli_req_state);
2656 SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
2657 SCVAL(vwv+0, 1, 0);
2658 SSVAL(vwv+1, 0, wct_offset);
2659 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
2660 /* properly end the chain */
2661 SCVAL(vwv+0, 0, 0xff);
2662 SCVAL(vwv+0, 1, 0xff);
2663 SSVAL(vwv+1, 0, 0);
2664 }
2665
2666 if (i == 0) {
2667 /*
2668 * The NBT and SMB header
2669 */
2670 this_iov[0] = state->smb1.iov[0];
2671 this_iov[1] = state->smb1.iov[1];
2672 this_iov += 2;
2673 } else {
2674 /*
2675 * This one is a bit subtle. We have to add
2676 * chain_padding bytes between the requests, and we
2677 * have to also include the wct field of the
2678 * subsequent requests. We use the subsequent header
2679 * for the padding, it contains the wct field in its
2680 * last byte.
2681 */
2682 this_iov[0].iov_len = chain_padding+1;
2683 this_iov[0].iov_base = (void *)&state->smb1.hdr[
2684 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
2685 memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
2686 this_iov += 1;
2687 }
2688
2689 /*
2690 * copy the words and bytes
2691 */
2692 memcpy(this_iov, state->smb1.iov+2,
2693 sizeof(struct iovec) * (state->smb1.iov_count-2));
2694 this_iov += state->smb1.iov_count - 2;
2695 chain_padding = next_padding;
2696 }
2697
2698 nbt_len = iov_buflen(&iov[1], iovlen-1);
2699 if ((nbt_len == -1) || (nbt_len > first_state->conn->smb1.max_xmit)) {
2700 TALLOC_FREE(iov);
2701 TALLOC_FREE(first_state->smb1.chained_requests);
2702 return NT_STATUS_INVALID_PARAMETER_MIX;
2703 }
2704
2705 status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
2706 if (!NT_STATUS_IS_OK(status)) {
2707 TALLOC_FREE(iov);
2708 TALLOC_FREE(first_state->smb1.chained_requests);
2709 return status;
2710 }
2711
2712 return NT_STATUS_OK;
2713 }
2714
2715 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
2716 {
2717 return ((tevent_queue_length(conn->outgoing) != 0)
2718 || (talloc_array_length(conn->pending) != 0));
2719 }
2720
2721 bool smbXcli_conn_dfs_supported(struct smbXcli_conn *conn)
2722 {
2723 if (conn->protocol >= PROTOCOL_SMB2_02) {
2724 return (smb2cli_conn_server_capabilities(conn) & SMB2_CAP_DFS);
2725 }
2726
2727 return (smb1cli_conn_capabilities(conn) & CAP_DFS);
2728 }
2729
2730 bool smb2cli_conn_req_possible(struct smbXcli_conn *conn, uint32_t *max_dyn_len)
2731 {
2732 uint16_t credits = 1;
2733
2734 if (conn->smb2.cur_credits == 0) {
2735 if (max_dyn_len != NULL) {
2736 *max_dyn_len = 0;
2737 }
2738 return false;
2739 }
2740
2741 if (conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2742 credits = conn->smb2.cur_credits;
2743 }
2744
2745 if (max_dyn_len != NULL) {
2746 *max_dyn_len = credits * 65536;
2747 }
2748
2749 return true;
2750 }
2751
2752 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
2753 {
2754 return conn->smb2.server.capabilities;
2755 }
2756
2757 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
2758 {
2759 return conn->smb2.server.security_mode;
2760 }
2761
2762 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
2763 {
2764 return conn->smb2.server.max_trans_size;
2765 }
2766
2767 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
2768 {
2769 return conn->smb2.server.max_read_size;
2770 }
2771
2772 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
2773 {
2774 return conn->smb2.server.max_write_size;
2775 }
2776
2777 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
2778 uint16_t max_credits)
2779 {
2780 conn->smb2.max_credits = max_credits;
2781 }
2782
2783 uint16_t smb2cli_conn_get_cur_credits(struct smbXcli_conn *conn)
2784 {
2785 return conn->smb2.cur_credits;
2786 }
2787
2788 uint8_t smb2cli_conn_get_io_priority(struct smbXcli_conn *conn)
2789 {
2790 if (conn->protocol < PROTOCOL_SMB3_11) {
2791 return 0;
2792 }
2793
2794 return conn->smb2.io_priority;
2795 }
2796
2797 void smb2cli_conn_set_io_priority(struct smbXcli_conn *conn,
2798 uint8_t io_priority)
2799 {
2800 conn->smb2.io_priority = io_priority;
2801 }
2802
2803 uint32_t smb2cli_conn_cc_chunk_len(struct smbXcli_conn *conn)
2804 {
2805 return conn->smb2.cc_chunk_len;
2806 }
2807
2808 void smb2cli_conn_set_cc_chunk_len(struct smbXcli_conn *conn,
2809 uint32_t chunk_len)
2810 {
2811 conn->smb2.cc_chunk_len = chunk_len;
2812 }
2813
2814 uint32_t smb2cli_conn_cc_max_chunks(struct smbXcli_conn *conn)
2815 {
2816 return conn->smb2.cc_max_chunks;
2817 }
2818
2819 void smb2cli_conn_set_cc_max_chunks(struct smbXcli_conn *conn,
2820 uint32_t max_chunks)
2821 {
2822 conn->smb2.cc_max_chunks = max_chunks;
2823 }
2824
2825 static void smb2cli_req_cancel_done(struct tevent_req *subreq);
2826
2827 static bool smb2cli_req_cancel(struct tevent_req *req)
2828 {
2829 struct smbXcli_req_state *state =
2830 tevent_req_data(req,
2831 struct smbXcli_req_state);
2832 struct smbXcli_tcon *tcon = state->tcon;
2833 struct smbXcli_session *session = state->session;
2834 uint8_t *fixed = state->smb2.pad;
2835 uint16_t fixed_len = 4;
2836 struct tevent_req *subreq;
2837 struct smbXcli_req_state *substate;
2838 NTSTATUS status;
2839
2840 SSVAL(fixed, 0, 0x04);
2841 SSVAL(fixed, 2, 0);
2842
2843 subreq = smb2cli_req_create(state, state->ev,
2844 state->conn,
2845 SMB2_OP_CANCEL,
2846 0, 0, /* flags */
2847 0, /* timeout */
2848 tcon, session,
2849 fixed, fixed_len,
2850 NULL, 0, 0);
2851 if (subreq == NULL) {
2852 return false;
2853 }
2854 substate = tevent_req_data(subreq, struct smbXcli_req_state);
2855
2856 SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, state->smb2.cancel_flags);
2857 SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, state->smb2.cancel_mid);
2858 SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, state->smb2.cancel_aid);
2859
2860 status = smb2cli_req_compound_submit(&subreq, 1);
2861 if (!NT_STATUS_IS_OK(status)) {
2862 TALLOC_FREE(subreq);
2863 return false;
2864 }
2865
2866 tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL);
2867
2868 return true;
2869 }
2870
2871 static void smb2cli_req_cancel_done(struct tevent_req *subreq)
2872 {
2873 /* we do not care about the result */
2874 TALLOC_FREE(subreq);
2875 }
2876
2877 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2878 struct tevent_context *ev,
2879 struct smbXcli_conn *conn,
2880 uint16_t cmd,
2881 uint32_t additional_flags,
2882 uint32_t clear_flags,
2883 uint32_t timeout_msec,
2884 struct smbXcli_tcon *tcon,
2885 struct smbXcli_session *session,
2886 const uint8_t *fixed,
2887 uint16_t fixed_len,
2888 const uint8_t *dyn,
2889 uint32_t dyn_len,
2890 uint32_t max_dyn_len)
2891 {
2892 struct tevent_req *req;
2893 struct smbXcli_req_state *state;
2894 uint32_t flags = 0;
2895 uint32_t tid = 0;
2896 uint64_t uid = 0;
2897 bool use_channel_sequence = false;
2898 uint16_t channel_sequence = 0;
2899 bool use_replay_flag = false;
2900
2901 req = tevent_req_create(mem_ctx, &state,
2902 struct smbXcli_req_state);
2903 if (req == NULL) {
2904 return NULL;
2905 }
2906
2907 state->ev = ev;
2908 state->conn = conn;
2909 state->session = session;
2910 state->tcon = tcon;
2911
2912 if (conn->smb2.server.capabilities & SMB2_CAP_PERSISTENT_HANDLES) {
2913 use_channel_sequence = true;
2914 } else if (conn->smb2.server.capabilities & SMB2_CAP_MULTI_CHANNEL) {
2915 use_channel_sequence = true;
2916 }
2917
2918 if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_00) {
2919 use_replay_flag = true;
2920 }
2921
2922 if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_11) {
2923 flags |= SMB2_PRIORITY_VALUE_TO_MASK(conn->smb2.io_priority);
2924 }
2925
2926 if (session) {
2927 uid = session->smb2->session_id;
2928
2929 if (use_channel_sequence) {
2930 channel_sequence = session->smb2->channel_sequence;
2931 }
2932
2933 if (use_replay_flag && session->smb2->replay_active) {
2934 additional_flags |= SMB2_HDR_FLAG_REPLAY_OPERATION;
2935 }
2936
2937 state->smb2.should_sign = session->smb2->should_sign;
2938 state->smb2.should_encrypt = session->smb2->should_encrypt;
2939
2940 if (cmd == SMB2_OP_SESSSETUP &&
2941 session->smb2_channel.signing_key.length == 0 &&
2942 session->smb2->signing_key.length != 0)
2943 {
2944 /*
2945 * a session bind needs to be signed
2946 */
2947 state->smb2.should_sign = true;
2948 }
2949
2950 if (cmd == SMB2_OP_SESSSETUP &&
2951 session->smb2_channel.signing_key.length == 0) {
2952 state->smb2.should_encrypt = false;
2953 }
2954
2955 if (additional_flags & SMB2_HDR_FLAG_SIGNED) {
2956 if (session->smb2_channel.signing_key.length == 0) {
2957 tevent_req_nterror(req, NT_STATUS_NO_USER_SESSION_KEY);
2958 return req;
2959 }
2960
2961 additional_flags &= ~SMB2_HDR_FLAG_SIGNED;
2962 state->smb2.should_sign = true;
2963 }
2964 }
2965
2966 if (tcon) {
2967 tid = tcon->smb2.tcon_id;
2968
2969 if (tcon->smb2.should_sign) {
2970 state->smb2.should_sign = true;
2971 }
2972 if (tcon->smb2.should_encrypt) {
2973 state->smb2.should_encrypt = true;
2974 }
2975 }
2976
2977 if (state->smb2.should_encrypt) {
2978 state->smb2.should_sign = false;
2979 }
2980
2981 state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2982 if (state->smb2.recv_iov == NULL) {
2983 TALLOC_FREE(req);
2984 return NULL;
2985 }
2986
2987 flags |= additional_flags;
2988 flags &= ~clear_flags;
2989
2990 state->smb2.fixed = fixed;
2991 state->smb2.fixed_len = fixed_len;
2992 state->smb2.dyn = dyn;
2993 state->smb2.dyn_len = dyn_len;
2994 state->smb2.max_dyn_len = max_dyn_len;
2995
2996 if (state->smb2.should_encrypt) {
2997 SIVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2998 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID, uid);
2999 }
3000
3001 SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID, SMB2_MAGIC);
3002 SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
3003 SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE, cmd);
3004 SSVAL(state->smb2.hdr, SMB2_HDR_CHANNEL_SEQUENCE, channel_sequence);
3005 SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS, flags);
3006 SIVAL(state->smb2.hdr, SMB2_HDR_PID, 0); /* reserved */
3007 SIVAL(state->smb2.hdr, SMB2_HDR_TID, tid);
3008 SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID, uid);
3009
3010 switch (cmd) {
3011 case SMB2_OP_CANCEL:
3012 state->one_way = true;
3013 break;
3014 case SMB2_OP_BREAK:
3015 /*
3016 * If this is a dummy request, it will have
3017 * UINT64_MAX as message id.
3018 * If we send on break acknowledgement,
3019 * this gets overwritten later.
3020 */
3021 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
3022 break;
3023 }
3024
3025 if (timeout_msec > 0) {
3026 struct timeval endtime;
3027
3028 endtime = timeval_current_ofs_msec(timeout_msec);
3029 if (!tevent_req_set_endtime(req, ev, endtime)) {
3030 return req;
3031 }
3032 }
3033
3034 return req;
3035 }
3036
3037 void smb2cli_req_set_notify_async(struct tevent_req *req)
3038 {
3039 struct smbXcli_req_state *state =
3040 tevent_req_data(req,
3041 struct smbXcli_req_state);
3042
3043 state->smb2.notify_async = true;
3044 }
3045
3046 static void smb2cli_req_writev_done(struct tevent_req *subreq);
3047 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
3048 TALLOC_CTX *tmp_mem,
3049 uint8_t *inbuf);
3050
3051 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
3052 int num_reqs)
3053 {
3054 struct smbXcli_req_state *state;
3055 struct tevent_req *subreq;
3056 struct iovec *iov;
3057 int i, num_iov, nbt_len;
3058 int tf_iov = -1;
3059 const DATA_BLOB *encryption_key = NULL;
3060 uint64_t encryption_session_id = 0;
3061 uint64_t nonce_high = UINT64_MAX;
3062 uint64_t nonce_low = UINT64_MAX;
3063
3064 /*
3065 * 1 for the nbt length, optional TRANSFORM
3066 * per request: HDR, fixed, dyn, padding
3067 * -1 because the last one does not need padding
3068 */
3069
3070 iov = talloc_array(reqs[0], struct iovec, 1 + 1 + 4*num_reqs - 1);
3071 if (iov == NULL) {
3072 return NT_STATUS_NO_MEMORY;
3073 }
3074
3075 num_iov = 1;
3076 nbt_len = 0;
3077
3078 /*
3079 * the session of the first request that requires encryption
3080 * specifies the encryption key.
3081 */
3082 for (i=0; i<num_reqs; i++) {
3083 if (!tevent_req_is_in_progress(reqs[i])) {
3084 return NT_STATUS_INTERNAL_ERROR;
3085 }
3086
3087 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
3088
3089 if (!smbXcli_conn_is_connected(state->conn)) {
3090 return NT_STATUS_CONNECTION_DISCONNECTED;
3091 }
3092
3093 if ((state->conn->protocol != PROTOCOL_NONE) &&
3094 (state->conn->protocol < PROTOCOL_SMB2_02)) {
3095 return NT_STATUS_REVISION_MISMATCH;
3096 }
3097
3098 if (state->session == NULL) {
3099 continue;
3100 }
3101
3102 if (!state->smb2.should_encrypt) {
3103 continue;
3104 }
3105
3106 encryption_key = &state->session->smb2->encryption_key;
3107 if (encryption_key->length == 0) {
3108 return NT_STATUS_INVALID_PARAMETER_MIX;
3109 }
3110
3111 encryption_session_id = state->session->smb2->session_id;
3112
3113 state->session->smb2->nonce_low += 1;
3114 if (state->session->smb2->nonce_low == 0) {
3115 state->session->smb2->nonce_high += 1;
3116 state->session->smb2->nonce_low += 1;
3117 }
3118
3119 /*
3120 * CCM and GCM algorithms must never have their
3121 * nonce wrap, or the security of the whole
3122 * communication and the keys is destroyed.
3123 * We must drop the connection once we have
3124 * transfered too much data.
3125 *
3126 * NOTE: We assume nonces greater than 8 bytes.
3127 */
3128 if (state->session->smb2->nonce_high >=
3129 state->session->smb2->nonce_high_max)
3130 {
3131 return NT_STATUS_ENCRYPTION_FAILED;
3132 }
3133
3134 nonce_high = state->session->smb2->nonce_high_random;
3135 nonce_high += state->session->smb2->nonce_high;
3136 nonce_low = state->session->smb2->nonce_low;
3137
3138 tf_iov = num_iov;
3139 iov[num_iov].iov_base = state->smb2.transform;
3140 iov[num_iov].iov_len = sizeof(state->smb2.transform);
3141 num_iov += 1;
3142
3143 SBVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
3144 SBVAL(state->smb2.transform, SMB2_TF_NONCE,
3145 nonce_low);
3146 SBVAL(state->smb2.transform, SMB2_TF_NONCE+8,
3147 nonce_high);
3148 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID,
3149 encryption_session_id);
3150
3151 nbt_len += SMB2_TF_HDR_SIZE;
3152 break;
3153 }
3154
3155 for (i=0; i<num_reqs; i++) {
3156 int hdr_iov;
3157 size_t reqlen;
3158 bool ret;
3159 uint16_t opcode;
3160 uint64_t avail;
3161 uint16_t charge;
3162 uint16_t credits;
3163 uint64_t mid;
3164 const DATA_BLOB *signing_key = NULL;
3165
3166 if (!tevent_req_is_in_progress(reqs[i])) {
3167 return NT_STATUS_INTERNAL_ERROR;
3168 }
3169
3170 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
3171
3172 if (!smbXcli_conn_is_connected(state->conn)) {
3173 return NT_STATUS_CONNECTION_DISCONNECTED;
3174 }
3175
3176 if ((state->conn->protocol != PROTOCOL_NONE) &&
3177 (state->conn->protocol < PROTOCOL_SMB2_02)) {
3178 return NT_STATUS_REVISION_MISMATCH;
3179 }
3180
3181 opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
3182 if (opcode == SMB2_OP_CANCEL) {
3183 goto skip_credits;
3184 }
3185
3186 avail = UINT64_MAX - state->conn->smb2.mid;
3187 if (avail < 1) {
3188 return NT_STATUS_CONNECTION_ABORTED;
3189 }
3190
3191 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
3192 uint32_t max_dyn_len = 1;
3193
3194 max_dyn_len = MAX(max_dyn_len, state->smb2.dyn_len);
3195 max_dyn_len = MAX(max_dyn_len, state->smb2.max_dyn_len);
3196
3197 charge = (max_dyn_len - 1)/ 65536 + 1;
3198 } else {
3199 charge = 1;
3200 }
3201
3202 charge = MAX(state->smb2.credit_charge, charge);
3203
3204 avail = MIN(avail, state->conn->smb2.cur_credits);
3205 if (avail < charge) {
3206 return NT_STATUS_INTERNAL_ERROR;
3207 }
3208
3209 credits = 0;
3210 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
3211 credits = state->conn->smb2.max_credits -
3212 state->conn->smb2.cur_credits;
3213 }
3214 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
3215 credits += 1;
3216 }
3217
3218 mid = state->conn->smb2.mid;
3219 state->conn->smb2.mid += charge;
3220 state->conn->smb2.cur_credits -= charge;
3221
3222 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
3223 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
3224 }
3225 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
3226 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
3227
3228 state->smb2.cancel_flags = 0;
3229 state->smb2.cancel_mid = mid;
3230 state->smb2.cancel_aid = 0;
3231
3232 skip_credits:
3233 if (state->session && encryption_key == NULL) {
3234 /*
3235 * We prefer the channel signing key if it is
3236 * already there.
3237 */
3238 if (state->smb2.should_sign) {
3239 signing_key = &state->session->smb2_channel.signing_key;
3240 }
3241
3242 /*
3243 * If it is a channel binding, we already have the main
3244 * signing key and try that one.
3245 */
3246 if (signing_key && signing_key->length == 0) {
3247 signing_key = &state->session->smb2->signing_key;
3248 }
3249
3250 /*
3251 * If we do not have any session key yet, we skip the
3252 * signing of SMB2_OP_SESSSETUP requests.
3253 */
3254 if (signing_key && signing_key->length == 0) {
3255 signing_key = NULL;
3256 }
3257 }
3258
3259 hdr_iov = num_iov;
3260 iov[num_iov].iov_base = state->smb2.hdr;
3261 iov[num_iov].iov_len = sizeof(state->smb2.hdr);
3262 num_iov += 1;
3263
3264 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
3265 iov[num_iov].iov_len = state->smb2.fixed_len;
3266 num_iov += 1;
3267
3268 if (state->smb2.dyn != NULL) {
3269 iov[num_iov].iov_base = discard_const(state->smb2.dyn);
3270 iov[num_iov].iov_len = state->smb2.dyn_len;
3271 num_iov += 1;
3272 }
3273
3274 reqlen = sizeof(state->smb2.hdr);
3275 reqlen += state->smb2.fixed_len;
3276 reqlen += state->smb2.dyn_len;
3277
3278 if (i < num_reqs-1) {
3279 if ((reqlen % 8) > 0) {
3280 uint8_t pad = 8 - (reqlen % 8);
3281 iov[num_iov].iov_base = state->smb2.pad;
3282 iov[num_iov].iov_len = pad;
3283 num_iov += 1;
3284 reqlen += pad;
3285 }
3286 SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
3287 }
3288
3289 state->smb2.encryption_session_id = encryption_session_id;
3290
3291 if (signing_key != NULL) {
3292 NTSTATUS status;
3293
3294 status = smb2_signing_sign_pdu(*signing_key,
3295 state->session->conn->protocol,
3296 &iov[hdr_iov], num_iov - hdr_iov);
3297 if (!NT_STATUS_IS_OK(status)) {
3298 return status;
3299 }
3300 }
3301
3302 nbt_len += reqlen;
3303
3304 ret = smbXcli_req_set_pending(reqs[i]);
3305 if (!ret) {
3306 return NT_STATUS_NO_MEMORY;
3307 }
3308 }
3309
3310 state = tevent_req_data(reqs[0], struct smbXcli_req_state);
3311 _smb_setlen_tcp(state->length_hdr, nbt_len);
3312 iov[0].iov_base = state->length_hdr;
3313 iov[0].iov_len = sizeof(state->length_hdr);
3314
3315 if (encryption_key != NULL) {
3316 NTSTATUS status;
3317 size_t buflen = nbt_len - SMB2_TF_HDR_SIZE;
3318 uint8_t *buf;
3319 int vi;
3320
3321 buf = talloc_array(iov, uint8_t, buflen);
3322 if (buf == NULL) {
3323 return NT_STATUS_NO_MEMORY;
3324 }
3325
3326 /*
3327 * We copy the buffers before encrypting them,
3328 * this is at least currently needed for the
3329 * to keep state->smb2.hdr.
3330 *
3331 * Also the callers may expect there buffers
3332 * to be const.
3333 */
3334 for (vi = tf_iov + 1; vi < num_iov; vi++) {
3335 struct iovec *v = &iov[vi];
3336 const uint8_t *o = (const uint8_t *)v->iov_base;
3337
3338 memcpy(buf, o, v->iov_len);
3339 v->iov_base = (void *)buf;
3340 buf += v->iov_len;
3341 }
3342
3343 status = smb2_signing_encrypt_pdu(*encryption_key,
3344 state->conn->smb2.server.cipher,
3345 &iov[tf_iov], num_iov - tf_iov);
3346 if (!NT_STATUS_IS_OK(status)) {
3347 return status;
3348 }
3349 }
3350
3351 if (state->conn->dispatch_incoming == NULL) {
3352 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3353 }
3354
3355 subreq = writev_send(state, state->ev, state->conn->outgoing,
3356 state->conn->sock_fd, false, iov, num_iov);
3357 if (subreq == NULL) {
3358 return NT_STATUS_NO_MEMORY;
3359 }
3360 tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]);
3361 state->write_req = subreq;
3362
3363 return NT_STATUS_OK;
3364 }
3365
3366 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
3367 {
3368 struct smbXcli_req_state *state =
3369 tevent_req_data(req,
3370 struct smbXcli_req_state);
3371
3372 state->smb2.credit_charge = charge;
3373 }
3374
3375 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
3376 struct tevent_context *ev,
3377 struct smbXcli_conn *conn,
3378 uint16_t cmd,
3379 uint32_t additional_flags,
3380 uint32_t clear_flags,
3381 uint32_t timeout_msec,
3382 struct smbXcli_tcon *tcon,
3383 struct smbXcli_session *session,
3384 const uint8_t *fixed,
3385 uint16_t fixed_len,
3386 const uint8_t *dyn,
3387 uint32_t dyn_len,
3388 uint32_t max_dyn_len)
3389 {
3390 struct tevent_req *req;
3391 NTSTATUS status;
3392
3393 req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
3394 additional_flags, clear_flags,
3395 timeout_msec,
3396 tcon, session,
3397 fixed, fixed_len,
3398 dyn, dyn_len,
3399 max_dyn_len);
3400 if (req == NULL) {
3401 return NULL;
3402 }
3403 if (!tevent_req_is_in_progress(req)) {
3404 return tevent_req_post(req, ev);
3405 }
3406 status = smb2cli_req_compound_submit(&req, 1);
3407 if (tevent_req_nterror(req, status)) {
3408 return tevent_req_post(req, ev);
3409 }
3410 return req;
3411 }
3412
3413 static void smb2cli_req_writev_done(struct tevent_req *subreq)
3414 {
3415 struct tevent_req *req =
3416 tevent_req_callback_data(subreq,
3417 struct tevent_req);
3418 struct smbXcli_req_state *state =
3419 tevent_req_data(req,
3420 struct smbXcli_req_state);
3421 ssize_t nwritten;
3422 int err;
3423
3424 state->write_req = NULL;
3425
3426 nwritten = writev_recv(subreq, &err);
3427 TALLOC_FREE(subreq);
3428 if (nwritten == -1) {
3429 /* here, we need to notify all pending requests */
3430 NTSTATUS status = map_nt_error_from_unix_common(err);
3431 smbXcli_conn_disconnect(state->conn, status);
3432 return;
3433 }
3434 }
3435
3436 static struct smbXcli_session* smbXcli_session_by_uid(struct smbXcli_conn *conn,
3437 uint64_t uid)
3438 {
3439 struct smbXcli_session *s = conn->sessions;
3440
3441 for (; s; s = s->next) {
3442 if (s->smb2->session_id != uid) {
3443 continue;
3444 }
3445 break;
3446 }
3447
3448 return s;
3449 }
3450
3451 static NTSTATUS smb2cli_inbuf_parse_compound(struct smbXcli_conn *conn,
3452 uint8_t *buf,
3453 size_t buflen,
3454 TALLOC_CTX *mem_ctx,
3455 struct iovec **piov, int *pnum_iov)
3456 {
3457 struct iovec *iov;
3458 int num_iov = 0;
3459 size_t taken = 0;
3460 uint8_t *first_hdr = buf;
3461 size_t verified_buflen = 0;
3462 uint8_t *tf = NULL;
3463 size_t tf_len = 0;
3464
3465 iov = talloc_array(mem_ctx, struct iovec, num_iov);
3466 if (iov == NULL) {
3467 return NT_STATUS_NO_MEMORY;
3468 }
3469
3470 while (taken < buflen) {
3471 size_t len = buflen - taken;
3472 uint8_t *hdr = first_hdr + taken;
3473 struct iovec *cur;
3474 size_t full_size;
3475 size_t next_command_ofs;
3476 uint16_t body_size;
3477 struct iovec *iov_tmp;
3478
3479 if (verified_buflen > taken) {
3480 len = verified_buflen - taken;
3481 } else {
3482 tf = NULL;
3483 tf_len = 0;
3484 }
3485
3486 if (len < 4) {
3487 DEBUG(10, ("%d bytes left, expected at least %d\n",
3488 (int)len, 4));
3489 goto inval;
3490 }
3491 if (IVAL(hdr, 0) == SMB2_TF_MAGIC) {
3492 struct smbXcli_session *s;
3493 uint64_t uid;
3494 struct iovec tf_iov[2];
3495 size_t enc_len;
3496 NTSTATUS status;
3497
3498 if (len < SMB2_TF_HDR_SIZE) {
3499 DEBUG(10, ("%d bytes left, expected at least %d\n",
3500 (int)len, SMB2_TF_HDR_SIZE));
3501 goto inval;
3502 }
3503 tf = hdr;
3504 tf_len = SMB2_TF_HDR_SIZE;
3505 taken += tf_len;
3506
3507 hdr = first_hdr + taken;
3508 enc_len = IVAL(tf, SMB2_TF_MSG_SIZE);
3509 uid = BVAL(tf, SMB2_TF_SESSION_ID);
3510
3511 if (len < SMB2_TF_HDR_SIZE + enc_len) {
3512 DEBUG(10, ("%d bytes left, expected at least %d\n",
3513 (int)len,
3514 (int)(SMB2_TF_HDR_SIZE + enc_len)));
3515 goto inval;
3516 }
3517
3518 s = smbXcli_session_by_uid(conn, uid);
3519 if (s == NULL) {
3520 DEBUG(10, ("unknown session_id %llu\n",
3521 (unsigned long long)uid));
3522 goto inval;
3523 }
3524
3525 tf_iov[0].iov_base = (void *)tf;
3526 tf_iov[0].iov_len = tf_len;
3527 tf_iov[1].iov_base = (void *)hdr;
3528 tf_iov[1].iov_len = enc_len;
3529
3530 status = smb2_signing_decrypt_pdu(s->smb2->decryption_key,
3531 conn->smb2.server.cipher,
3532 tf_iov, 2);
3533 if (!NT_STATUS_IS_OK(status)) {
3534 TALLOC_FREE(iov);
3535 return status;
3536 }
3537
3538 verified_buflen = taken + enc_len;
3539 len = enc_len;
3540 }
3541
3542 /*
3543 * We need the header plus the body length field
3544 */
3545
3546 if (len < SMB2_HDR_BODY + 2) {
3547 DEBUG(10, ("%d bytes left, expected at least %d\n",
3548 (int)len, SMB2_HDR_BODY));
3549 goto inval;
3550 }
3551 if (IVAL(hdr, 0) != SMB2_MAGIC) {
3552 DEBUG(10, ("Got non-SMB2 PDU: %x\n",
3553 IVAL(hdr, 0)));
3554 goto inval;
3555 }
3556 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
3557 DEBUG(10, ("Got HDR len %d, expected %d\n",
3558 SVAL(hdr, 4), SMB2_HDR_BODY));
3559 goto inval;
3560 }
3561
3562 full_size = len;
3563 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
3564 body_size = SVAL(hdr, SMB2_HDR_BODY);
3565
3566 if (next_command_ofs != 0) {
3567 if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
3568 goto inval;
3569 }
3570 if (next_command_ofs > full_size) {
3571 goto inval;
3572 }
3573 full_size = next_command_ofs;
3574 }
3575 if (body_size < 2) {
3576 goto inval;
3577 }
3578 body_size &= 0xfffe;
3579
3580 if (body_size > (full_size - SMB2_HDR_BODY)) {
3581 goto inval;
3582 }
3583
3584 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
3585 num_iov + 4);
3586 if (iov_tmp == NULL) {
3587 TALLOC_FREE(iov);
3588 return NT_STATUS_NO_MEMORY;
3589 }
3590 iov = iov_tmp;
3591 cur = &iov[num_iov];
3592 num_iov += 4;
3593
3594 cur[0].iov_base = tf;
3595 cur[0].iov_len = tf_len;
3596 cur[1].iov_base = hdr;
3597 cur[1].iov_len = SMB2_HDR_BODY;
3598 cur[2].iov_base = hdr + SMB2_HDR_BODY;
3599 cur[2].iov_len = body_size;
3600 cur[3].iov_base = hdr + SMB2_HDR_BODY + body_size;
3601 cur[3].iov_len = full_size - (SMB2_HDR_BODY + body_size);
3602
3603 taken += full_size;
3604 }
3605
3606 *piov = iov;
3607 *pnum_iov = num_iov;
3608 return NT_STATUS_OK;
3609
3610 inval:
3611 TALLOC_FREE(iov);
3612 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3613 }
3614
3615 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
3616 uint64_t mid)
3617 {
3618 size_t num_pending = talloc_array_length(conn->pending);
3619 size_t i;
3620
3621 for (i=0; i<num_pending; i++) {
3622 struct tevent_req *req = conn->pending[i];
3623 struct smbXcli_req_state *state =
3624 tevent_req_data(req,
3625 struct smbXcli_req_state);
3626
3627 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
3628 return req;
3629 }
3630 }
3631 return NULL;
3632 }
3633
3634 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
3635 TALLOC_CTX *tmp_mem,
3636 uint8_t *inbuf)
3637 {
3638 struct tevent_req *req;
3639 struct smbXcli_req_state *state = NULL;
3640 struct iovec *iov = NULL;
3641 int i, num_iov = 0;
3642 NTSTATUS status;
3643 bool defer = true;
3644 struct smbXcli_session *last_session = NULL;
3645 size_t inbuf_len = smb_len_tcp(inbuf);
3646
3647 status = smb2cli_inbuf_parse_compound(conn,
3648 inbuf + NBT_HDR_SIZE,
3649 inbuf_len,
3650 tmp_mem,
3651 &iov, &num_iov);
3652 if (!NT_STATUS_IS_OK(status)) {
3653 return status;
3654 }
3655
3656 for (i=0; i<num_iov; i+=4) {
3657 uint8_t *inbuf_ref = NULL;
3658 struct iovec *cur = &iov[i];
3659 uint8_t *inhdr = (uint8_t *)cur[1].iov_base;
3660 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
3661 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
3662 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
3663 uint16_t req_opcode;
3664 uint32_t req_flags;
3665 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
3666 uint32_t new_credits;
3667 struct smbXcli_session *session = NULL;
3668 const DATA_BLOB *signing_key = NULL;
3669 bool was_encrypted = false;
3670
3671 new_credits = conn->smb2.cur_credits;
3672 new_credits += credits;
3673 if (new_credits > UINT16_MAX) {
3674 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3675 }
3676 conn->smb2.cur_credits += credits;
3677
3678 req = smb2cli_conn_find_pending(conn, mid);
3679 if (req == NULL) {
3680 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3681 }
3682 state = tevent_req_data(req, struct smbXcli_req_state);
3683
3684 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
3685 if (opcode != req_opcode) {
3686 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3687 }
3688 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
3689
3690 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
3691 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3692 }
3693
3694 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
3695 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
3696 NT_STATUS_EQUAL(status, STATUS_PENDING)) {
3697 uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
3698
3699 if (state->smb2.got_async) {
3700 /* We only expect one STATUS_PENDING response */
3701 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3702 }
3703 state->smb2.got_async = true;
3704
3705 /*
3706 * async interim responses are not signed,
3707 * even if the SMB2_HDR_FLAG_SIGNED flag
3708 * is set.
3709 */
3710 state->smb2.cancel_flags = SMB2_HDR_FLAG_ASYNC;
3711 state->smb2.cancel_mid = 0;
3712 state->smb2.cancel_aid = async_id;
3713
3714 if (state->smb2.notify_async) {
3715 tevent_req_defer_callback(req, state->ev);
3716 tevent_req_notify_callback(req);
3717 }
3718 continue;
3719 }
3720
3721 session = state->session;
3722 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
3723 session = last_session;
3724 }
3725 last_session = session;
3726
3727 if (state->smb2.should_sign) {
3728 if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
3729 return NT_STATUS_ACCESS_DENIED;
3730 }
3731 }
3732
3733 if (flags & SMB2_HDR_FLAG_SIGNED) {
3734 uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
3735
3736 if (session == NULL) {
3737 session = smbXcli_session_by_uid(state->conn,
3738 uid);
3739 }
3740
3741 if (session == NULL) {
3742 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3743 }
3744
3745 last_session = session;
3746 signing_key = &session->smb2_channel.signing_key;
3747 }
3748
3749 if (opcode == SMB2_OP_SESSSETUP) {
3750 /*
3751 * We prefer the channel signing key, if it is
3752 * already there.
3753 *
3754 * If we do not have a channel signing key yet,
3755 * we try the main signing key, if it is not
3756 * the final response.
3757 */
3758 if (signing_key && signing_key->length == 0 &&
3759 !NT_STATUS_IS_OK(status)) {
3760 signing_key = &session->smb2->signing_key;
3761 }
3762
3763 if (signing_key && signing_key->length == 0) {
3764 /*
3765 * If we do not have a session key to
3766 * verify the signature, we defer the
3767 * signing check to the caller.
3768 *
3769 * The caller gets NT_STATUS_OK, it
3770 * has to call
3771 * smb2cli_session_set_session_key()
3772 * or
3773 * smb2cli_session_set_channel_key()
3774 * which will check the signature
3775 * with the channel signing key.
3776 */
3777 signing_key = NULL;
3778 }
3779 }
3780
3781 if (cur[0].iov_len == SMB2_TF_HDR_SIZE) {
3782 const uint8_t *tf = (const uint8_t *)cur[0].iov_base;
3783 uint64_t uid = BVAL(tf, SMB2_TF_SESSION_ID);
3784
3785 /*
3786 * If the response was encrypted in a SMB2_TRANSFORM
3787 * pdu, which belongs to the correct session,
3788 * we do not need to do signing checks
3789 *
3790 * It could be the session the response belongs to
3791 * or the session that was used to encrypt the
3792 * SMB2_TRANSFORM request.
3793 */
3794 if ((session && session->smb2->session_id == uid) ||
3795 (state->smb2.encryption_session_id == uid)) {
3796 signing_key = NULL;
3797 was_encrypted = true;
3798 }
3799 }
3800
3801 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
3802 /*
3803 * if the server returns NT_STATUS_USER_SESSION_DELETED
3804 * the response is not signed and we should
3805 * propagate the NT_STATUS_USER_SESSION_DELETED
3806 * status to the caller.
3807 */
3808 state->smb2.signing_skipped = true;
3809 signing_key = NULL;
3810 }
3811
3812 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3813 /*
3814 * if the server returns
3815 * NT_STATUS_INVALID_PARAMETER
3816 * the response might not be encrypted.
3817 */
3818 if (state->smb2.should_encrypt && !was_encrypted) {
3819 state->smb2.signing_skipped = true;
3820 signing_key = NULL;
3821 }
3822 }
3823
3824 if (state->smb2.should_encrypt && !was_encrypted) {
3825 if (!state->smb2.signing_skipped) {
3826 return NT_STATUS_ACCESS_DENIED;
3827 }
3828 }
3829
3830 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
3831 NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
3832 NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3833 /*
3834 * if the server returns
3835 * NT_STATUS_NETWORK_NAME_DELETED
3836 * NT_STATUS_FILE_CLOSED
3837 * NT_STATUS_INVALID_PARAMETER
3838 * the response might not be signed
3839 * as this happens before the signing checks.
3840 *
3841 * If server echos the signature (or all zeros)
3842 * we should report the status from the server
3843 * to the caller.
3844 */
3845 if (signing_key) {
3846 int cmp;
3847
3848 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3849 state->smb2.hdr+SMB2_HDR_SIGNATURE,
3850 16);
3851 if (cmp == 0) {
3852 state->smb2.signing_skipped = true;
3853 signing_key = NULL;
3854 }
3855 }
3856 if (signing_key) {
3857 bool zero;
3858 zero = all_zero(inhdr+SMB2_HDR_SIGNATURE, 16);
3859 if (zero) {
3860 state->smb2.signing_skipped = true;
3861 signing_key = NULL;
3862 }
3863 }
3864 }
3865
3866 if (signing_key) {
3867 status = smb2_signing_check_pdu(*signing_key,
3868 state->conn->protocol,
3869 &cur[1], 3);
3870 if (!NT_STATUS_IS_OK(status)) {
3871 /*
3872 * If the signing check fails, we disconnect
3873 * the connection.
3874 */
3875 return status;
3876 }
3877 }
3878
3879 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
3880 (session != NULL) && session->disconnect_expired)
3881 {
3882 /*
3883 * this should be a short term hack
3884 * until the upper layers have implemented
3885 * re-authentication.
3886 */
3887 return status;
3888 }
3889
3890 smbXcli_req_unset_pending(req);
3891
3892 /*
3893 * There might be more than one response
3894 * we need to defer the notifications
3895 */
3896 if ((num_iov == 5) && (talloc_array_length(conn->pending) == 0)) {
3897 defer = false;
3898 }
3899
3900 if (defer) {
3901 tevent_req_defer_callback(req, state->ev);
3902 }
3903
3904 /*
3905 * Note: here we use talloc_reference() in a way
3906 * that does not expose it to the caller.
3907 */
3908 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
3909 if (tevent_req_nomem(inbuf_ref, req)) {
3910 continue;
3911 }
3912
3913 /* copy the related buffers */
3914 state->smb2.recv_iov[0] = cur[1];
3915 state->smb2.recv_iov[1] = cur[2];
3916 state->smb2.recv_iov[2] = cur[3];
3917
3918 tevent_req_done(req);
3919 }
3920
3921 if (defer) {
3922 return NT_STATUS_RETRY;
3923 }
3924
3925 return NT_STATUS_OK;
3926 }
3927
3928 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3929 struct iovec **piov,
3930 const struct smb2cli_req_expected_response *expected,
3931 size_t num_expected)
3932 {
3933 struct smbXcli_req_state *state =
3934 tevent_req_data(req,
3935 struct smbXcli_req_state);
3936 NTSTATUS status;
3937 size_t body_size;
3938 bool found_status = false;
3939 bool found_size = false;
3940 size_t i;
3941
3942 if (piov != NULL) {
3943 *piov = NULL;
3944 }
3945
3946 if (tevent_req_is_in_progress(req) && state->smb2.got_async) {
3947 return STATUS_PENDING;
3948 }
3949
3950 if (tevent_req_is_nterror(req, &status)) {
3951 for (i=0; i < num_expected; i++) {
3952 if (NT_STATUS_EQUAL(status, expected[i].status)) {
3953 found_status = true;
3954 break;
3955 }
3956 }
3957
3958 if (found_status) {
3959 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
3960 }
3961
3962 return status;
3963 }
3964
3965 if (num_expected == 0) {
3966 found_status = true;
3967 found_size = true;
3968 }
3969
3970 status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
3971 body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
3972
3973 for (i=0; i < num_expected; i++) {
3974 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
3975 continue;
3976 }
3977
3978 found_status = true;
3979 if (expected[i].body_size == 0) {
3980 found_size = true;
3981 break;
3982 }
3983
3984 if (expected[i].body_size == body_size) {
3985 found_size = true;
3986 break;
3987 }
3988 }
3989
3990 if (!found_status) {
3991 return status;
3992 }
3993
3994 if (state->smb2.signing_skipped) {
3995 if (num_expected > 0) {
3996 return NT_STATUS_ACCESS_DENIED;
3997 }
3998 if (!NT_STATUS_IS_ERR(status)) {
3999 return NT_STATUS_ACCESS_DENIED;
4000 }
4001 }
4002
4003 if (!found_size) {
4004 return NT_STATUS_INVALID_NETWORK_RESPONSE;
4005 }
4006
4007 if (piov != NULL) {
4008 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
4009 }
4010
4011 return status;
4012 }
4013
4014 NTSTATUS smb2cli_req_get_sent_iov(struct tevent_req *req,
4015 struct iovec *sent_iov)
4016 {
4017 struct smbXcli_req_state *state =
4018 tevent_req_data(req,
4019 struct smbXcli_req_state);
4020
4021 if (tevent_req_is_in_progress(req)) {
4022 return STATUS_PENDING;
4023 }
4024
4025 sent_iov[0].iov_base = state->smb2.hdr;
4026 sent_iov[0].iov_len = sizeof(state->smb2.hdr);
4027
4028 sent_iov[1].iov_base = discard_const(state->smb2.fixed);
4029 sent_iov[1].iov_len = state->smb2.fixed_len;
4030
4031 if (state->smb2.dyn != NULL) {
4032 sent_iov[2].iov_base = discard_const(state->smb2.dyn);
4033 sent_iov[2].iov_len = state->smb2.dyn_len;
4034 } else {
4035 sent_iov[2].iov_base = NULL;
4036 sent_iov[2].iov_len = 0;
4037 }
4038
4039 return NT_STATUS_OK;
4040 }
4041
4042 static const struct {
4043 enum protocol_types proto;
4044 const char *smb1_name;
4045 } smb1cli_prots[] = {
4046 {PROTOCOL_CORE, "PC NETWORK PROGRAM 1.0"},
4047 {PROTOCOL_COREPLUS, "MICROSOFT NETWORKS 1.03"},
4048 {PROTOCOL_LANMAN1, "MICROSOFT NETWORKS 3.0"},
4049 {PROTOCOL_LANMAN1, "LANMAN1.0"},
4050 {PROTOCOL_LANMAN2, "LM1.2X002"},
4051 {PROTOCOL_LANMAN2, "DOS LANMAN2.1"},
4052 {PROTOCOL_LANMAN2, "LANMAN2.1"},
4053 {PROTOCOL_LANMAN2, "Samba"},
4054 {PROTOCOL_NT1, "NT LANMAN 1.0"},
4055 {PROTOCOL_NT1, "NT LM 0.12"},
4056 {PROTOCOL_SMB2_02, "SMB 2.002"},
4057 {PROTOCOL_SMB2_10, "SMB 2.???"},
4058 };
4059
4060 static const struct {
4061 enum protocol_types proto;
4062 uint16_t smb2_dialect;
4063 } smb2cli_prots[] = {
4064 {PROTOCOL_SMB2_02, SMB2_DIALECT_REVISION_202},
4065 {PROTOCOL_SMB2_10, SMB2_DIALECT_REVISION_210},
4066 {PROTOCOL_SMB2_22, SMB2_DIALECT_REVISION_222},
4067 {PROTOCOL_SMB2_24, SMB2_DIALECT_REVISION_224},
4068 {PROTOCOL_SMB3_00, SMB3_DIALECT_REVISION_300},
4069 {PROTOCOL_SMB3_02, SMB3_DIALECT_REVISION_302},
4070 {PROTOCOL_SMB3_10, SMB3_DIALECT_REVISION_310},
4071 {PROTOCOL_SMB3_11, SMB3_DIALECT_REVISION_311},
4072 };
4073
4074 struct smbXcli_negprot_state {
4075 struct smbXcli_conn *conn;
4076 struct tevent_context *ev;
4077 uint32_t timeout_msec;
4078
4079 struct {
4080 uint8_t fixed[36];
4081 } smb2;
4082 };
4083
4084 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
4085 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
4086 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
4087 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
4088 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
4089 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
4090 TALLOC_CTX *frame,
4091 uint8_t *inbuf);
4092
4093 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
4094 struct tevent_context *ev,
4095 struct smbXcli_conn *conn,
4096 uint32_t timeout_msec,
4097 enum protocol_types min_protocol,
4098 enum protocol_types max_protocol,
4099 uint16_t max_credits)
4100 {
4101 struct tevent_req *req, *subreq;
4102 struct smbXcli_negprot_state *state;
4103
4104 req = tevent_req_create(mem_ctx, &state,
4105 struct smbXcli_negprot_state);
4106 if (req == NULL) {
4107 return NULL;
4108 }
4109 state->conn = conn;
4110 state->ev = ev;
4111 state->timeout_msec = timeout_msec;
4112
4113 if (min_protocol == PROTOCOL_NONE) {
4114 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
4115 return tevent_req_post(req, ev);
4116 }
4117
4118 if (max_protocol == PROTOCOL_NONE) {
4119 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
4120 return tevent_req_post(req, ev);
4121 }
4122
4123 if (min_protocol > max_protocol) {
4124 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
4125 return tevent_req_post(req, ev);
4126 }
4127
4128 conn->min_protocol = min_protocol;
4129 conn->max_protocol = max_protocol;
4130 conn->protocol = PROTOCOL_NONE;
4131
4132 if (max_protocol >= PROTOCOL_SMB2_02) {
4133 conn->smb2.max_credits = max_credits;
4134 }
4135
4136 if ((min_protocol < PROTOCOL_SMB2_02) &&
4137 (max_protocol < PROTOCOL_SMB2_02)) {
4138 /*
4139 * SMB1 only...
4140 */
4141 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
4142
4143 subreq = smbXcli_negprot_smb1_subreq(state);
4144 if (tevent_req_nomem(subreq, req)) {
4145 return tevent_req_post(req, ev);
4146 }
4147 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
4148 return req;
4149 }
4150
4151 if ((min_protocol >= PROTOCOL_SMB2_02) &&
4152 (max_protocol >= PROTOCOL_SMB2_02)) {
4153 /*
4154 * SMB2 only...
4155 */
4156 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
4157
4158 subreq = smbXcli_negprot_smb2_subreq(state);
4159 if (tevent_req_nomem(subreq, req)) {
4160 return tevent_req_post(req, ev);
4161 }
4162 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4163 return req;
4164 }
4165
4166 /*
4167 * We send an SMB1 negprot with the SMB2 dialects
4168 * and expect a SMB1 or a SMB2 response.
4169 *
4170 * smbXcli_negprot_dispatch_incoming() will fix the
4171 * callback to match protocol of the response.
4172 */
4173 conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
4174
4175 subreq = smbXcli_negprot_smb1_subreq(state);
4176 if (tevent_req_nomem(subreq, req)) {
4177 return tevent_req_post(req, ev);
4178 }
4179 tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
4180 return req;
4181 }
4182
4183 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
4184 {
4185 struct tevent_req *req =
4186 tevent_req_callback_data(subreq,
4187 struct tevent_req);
4188 NTSTATUS status;
4189
4190 /*
4191 * we just want the low level error
4192 */
4193 status = tevent_req_simple_recv_ntstatus(subreq);
4194 TALLOC_FREE(subreq);
4195 if (tevent_req_nterror(req, status)) {
4196 return;
4197 }
4198
4199 /* this should never happen */
4200 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
4201 }
4202
4203 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
4204 {
4205 size_t i;
4206 DATA_BLOB bytes = data_blob_null;
4207 uint8_t flags;
4208 uint16_t flags2;
4209
4210 /* setup the protocol strings */
4211 for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
4212 uint8_t c = 2;
4213 bool ok;
4214
4215 if (smb1cli_prots[i].proto < state->conn->min_protocol) {
4216 continue;
4217 }
4218
4219 if (smb1cli_prots[i].proto > state->conn->max_protocol) {
4220 continue;
4221 }
4222
4223 ok = data_blob_append(state, &bytes, &c, sizeof(c));
4224 if (!ok) {
4225 return NULL;
4226 }
4227
4228 /*
4229 * We now it is already ascii and
4230 * we want NULL termination.
4231 */
4232 ok = data_blob_append(state, &bytes,
4233 smb1cli_prots[i].smb1_name,
4234 strlen(smb1cli_prots[i].smb1_name)+1);
4235 if (!ok) {
4236 return NULL;
4237 }
4238 }
4239
4240 smb1cli_req_flags(state->conn->max_protocol,
4241 state->conn->smb1.client.capabilities,
4242 SMBnegprot,
4243 0, 0, &flags,
4244 0, 0, &flags2);
4245
4246 return smb1cli_req_send(state, state->ev, state->conn,
4247 SMBnegprot,
4248 flags, ~flags,
4249 flags2, ~flags2,
4250 state->timeout_msec,
4251 0xFFFE, 0, NULL, /* pid, tid, session */
4252 0, NULL, /* wct, vwv */
4253 bytes.length, bytes.data);
4254 }
4255
4256 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
4257 {
4258 struct tevent_req *req =
4259 tevent_req_callback_data(subreq,
4260 struct tevent_req);
4261 struct smbXcli_negprot_state *state =
4262 tevent_req_data(req,
4263 struct smbXcli_negprot_state);
4264 struct smbXcli_conn *conn = state->conn;
4265 struct iovec *recv_iov = NULL;
4266 uint8_t *inhdr;
4267 uint8_t wct;
4268 uint16_t *vwv;
4269 uint32_t num_bytes;
4270 uint8_t *bytes;
4271 NTSTATUS status;
4272 uint16_t protnum;
4273 size_t i;
4274 size_t num_prots = 0;
4275 uint8_t flags;
4276 uint32_t client_capabilities = conn->smb1.client.capabilities;
4277 uint32_t both_capabilities;
4278 uint32_t server_capabilities = 0;
4279 uint32_t capabilities;
4280 uint32_t client_max_xmit = conn->smb1.client.max_xmit;
4281 uint32_t server_max_xmit = 0;
4282 uint32_t max_xmit;
4283 uint32_t server_max_mux = 0;
4284 uint16_t server_security_mode = 0;
4285 uint32_t server_session_key = 0;
4286 bool server_readbraw = false;
4287 bool server_writebraw = false;
4288 bool server_lockread = false;
4289 bool server_writeunlock = false;
4290 struct GUID server_guid = GUID_zero();
4291 DATA_BLOB server_gss_blob = data_blob_null;
4292 uint8_t server_challenge[8];
4293 char *server_workgroup = NULL;
4294 char *server_name = NULL;
4295 int server_time_zone = 0;
4296 NTTIME server_system_time = 0;
4297 static const struct smb1cli_req_expected_response expected[] = {
4298 {
4299 .status = NT_STATUS_OK,
4300 .wct = 0x11, /* NT1 */
4301 },
4302 {
4303 .status = NT_STATUS_OK,
4304 .wct = 0x0D, /* LM */
4305 },
4306 {
4307 .status = NT_STATUS_OK,
4308 .wct = 0x01, /* CORE */
4309 }
4310 };
4311
4312 ZERO_STRUCT(server_challenge);
4313
4314 status = smb1cli_req_recv(subreq, state,
4315 &recv_iov,
4316 &inhdr,
4317 &wct,
4318 &vwv,
4319 NULL, /* pvwv_offset */
4320 &num_bytes,
4321 &bytes,
4322 NULL, /* pbytes_offset */
4323 NULL, /* pinbuf */
4324 expected, ARRAY_SIZE(expected));
4325 TALLOC_FREE(subreq);
4326 if (tevent_req_nterror(req, status)) {
4327 return;
4328 }
4329
4330 flags = CVAL(inhdr, HDR_FLG);
4331
4332 protnum = SVAL(vwv, 0);
4333
4334 for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
4335 if (smb1cli_prots[i].proto < state->conn->min_protocol) {
4336 continue;
4337 }
4338
4339 if (smb1cli_prots[i].proto > state->conn->max_protocol) {
4340 continue;
4341 }
4342
4343 if (protnum != num_prots) {
4344 num_prots++;
4345 continue;
4346 }
4347
4348 conn->protocol = smb1cli_prots[i].proto;
4349 break;
4350 }
4351
4352 if (conn->protocol == PROTOCOL_NONE) {
4353 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4354 return;
4355 }
4356
4357 if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
4358 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
4359 "and the selected protocol level doesn't support it.\n"));
4360 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4361 return;
4362 }
4363
4364 if (flags & FLAG_SUPPORT_LOCKREAD) {
4365 server_lockread = true;
4366 server_writeunlock = true;
4367 }
4368
4369 if (conn->protocol >= PROTOCOL_NT1) {
4370 const char *client_signing = NULL;
4371 bool server_mandatory = false;
4372 bool server_allowed = false;
4373 const char *server_signing = NULL;
4374 bool ok;
4375 uint8_t key_len;
4376
4377 if (wct != 0x11) {
4378 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4379 return;
4380 }
4381
4382 /* NT protocol */
4383 server_security_mode = CVAL(vwv + 1, 0);
4384 server_max_mux = SVAL(vwv + 1, 1);
4385 server_max_xmit = IVAL(vwv + 3, 1);
4386 server_session_key = IVAL(vwv + 7, 1);
4387 server_time_zone = SVALS(vwv + 15, 1);
4388 server_time_zone *= 60;
4389 /* this time arrives in real GMT */
4390 server_system_time = BVAL(vwv + 11, 1);
4391 server_capabilities = IVAL(vwv + 9, 1);
4392
4393 key_len = CVAL(vwv + 16, 1);
4394
4395 if (server_capabilities & CAP_RAW_MODE) {
4396 server_readbraw = true;
4397 server_writebraw = true;
4398 }
4399 if (server_capabilities & CAP_LOCK_AND_READ) {
4400 server_lockread = true;
4401 }
4402
4403 if (server_capabilities & CAP_EXTENDED_SECURITY) {
4404 DATA_BLOB blob1, blob2;
4405
4406 if (num_bytes < 16) {
4407 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4408 return;
4409 }
4410
4411 blob1 = data_blob_const(bytes, 16);
4412 status = GUID_from_data_blob(&blob1, &server_guid);
4413 if (tevent_req_nterror(req, status)) {
4414 return;
4415 }
4416
4417 blob1 = data_blob_const(bytes+16, num_bytes-16);
4418 blob2 = data_blob_dup_talloc(state, blob1);
4419 if (blob1.length > 0 &&
4420 tevent_req_nomem(blob2.data, req)) {
4421 return;
4422 }
4423 server_gss_blob = blob2;
4424 } else {
4425 DATA_BLOB blob1, blob2;
4426
4427 if (num_bytes < key_len) {
4428 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4429 return;
4430 }
4431
4432 if (key_len != 0 && key_len != 8) {
4433 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4434 return;
4435 }
4436
4437 if (key_len == 8) {
4438 memcpy(server_challenge, bytes, 8);
4439 }
4440
4441 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4442 blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
4443 if (blob1.length > 0) {
4444 size_t len;
4445
4446 len = utf16_len_n(blob1.data,
4447 blob1.length);
4448 blob1.length = len;
4449
4450 ok = convert_string_talloc(state,
4451 CH_UTF16LE,
4452 CH_UNIX,
4453 blob1.data,
4454 blob1.length,
4455 &server_workgroup,
4456 &len);
4457 if (!ok) {
4458 status = map_nt_error_from_unix_common(errno);
4459 tevent_req_nterror(req, status);
4460 return;
4461 }
4462 }
4463
4464 blob2.data += blob1.length;
4465 blob2.length -= blob1.length;
4466 if (blob2.length > 0) {
4467 size_t len;
4468
4469 len = utf16_len_n(blob1.data,
4470 blob1.length);
4471 blob1.length = len;
4472
4473 ok = convert_string_talloc(state,
4474 CH_UTF16LE,
4475 CH_UNIX,
4476 blob2.data,
4477 blob2.length,
4478 &server_name,
4479 &len);
4480 if (!ok) {
4481 status = map_nt_error_from_unix_common(errno);
4482 tevent_req_nterror(req, status);
4483 return;
4484 }
4485 }
4486 }
4487
4488 client_signing = "disabled";
4489 if (conn->allow_signing) {
4490 client_signing = "allowed";
4491 }
4492 if (conn->mandatory_signing) {
4493 client_signing = "required";
4494 }
4495
4496 server_signing = "not supported";
4497 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
4498 server_signing = "supported";
4499 server_allowed = true;
4500 } else if (conn->mandatory_signing) {
4501 /*
4502 * We have mandatory signing as client
4503 * lets assume the server will look at our
4504 * FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED
4505 * flag in the session setup
4506 */
4507 server_signing = "not announced";
4508 server_allowed = true;
4509 }
4510 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
4511 server_signing = "required";
4512 server_mandatory = true;
4513 }
4514
4515 ok = smb_signing_set_negotiated(conn->smb1.signing,
4516 server_allowed,
4517 server_mandatory);
4518 if (!ok) {
4519 DEBUG(1,("cli_negprot: SMB signing is required, "
4520 "but client[%s] and server[%s] mismatch\n",
4521 client_signing, server_signing));
4522 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4523 return;
4524 }
4525
4526 } else if (conn->protocol >= PROTOCOL_LANMAN1) {
4527 DATA_BLOB blob1;
4528 uint8_t key_len;
4529 time_t t;
4530
4531 if (wct != 0x0D) {
4532 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4533 return;
4534 }
4535
4536 server_security_mode = SVAL(vwv + 1, 0);
4537 server_max_xmit = SVAL(vwv + 2, 0);
4538 server_max_mux = SVAL(vwv + 3, 0);
4539 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
4540 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
4541 server_session_key = IVAL(vwv + 6, 0);
4542 server_time_zone = SVALS(vwv + 10, 0);
4543 server_time_zone *= 60;
4544 /* this time is converted to GMT by make_unix_date */
4545 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
4546 unix_to_nt_time(&server_system_time, t);
4547 key_len = SVAL(vwv + 11, 0);
4548
4549 if (num_bytes < key_len) {
4550 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4551 return;
4552 }
4553
4554 if (key_len != 0 && key_len != 8) {
4555 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4556 return;
4557 }
4558
4559 if (key_len == 8) {
4560 memcpy(server_challenge, bytes, 8);
4561 }
4562
4563 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4564 if (blob1.length > 0) {
4565 size_t len;
4566 bool ok;
4567
4568 len = utf16_len_n(blob1.data,
4569 blob1.length);
4570 blob1.length = len;
4571
4572 ok = convert_string_talloc(state,
4573 CH_DOS,
4574 CH_UNIX,
4575 blob1.data,
4576 blob1.length,
4577 &server_workgroup,
4578 &len);
4579 if (!ok) {
4580 status = map_nt_error_from_unix_common(errno);
4581 tevent_req_nterror(req, status);
4582 return;
4583 }
4584 }
4585
4586 } else {
4587 /* the old core protocol */
4588 server_time_zone = get_time_zone(time(NULL));
4589 server_max_xmit = 1024;
4590 server_max_mux = 1;
4591 }
4592
4593 if (server_max_xmit < 1024) {
4594 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4595 return;
4596 }
4597
4598 if (server_max_mux < 1) {
4599 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4600 return;
4601 }
4602
4603 /*
4604 * Now calculate the negotiated capabilities
4605 * based on the mask for:
4606 * - client only flags
4607 * - flags used in both directions
4608 * - server only flags
4609 */
4610 both_capabilities = client_capabilities & server_capabilities;
4611 capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
4612 capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
4613 capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
4614
4615 max_xmit = MIN(client_max_xmit, server_max_xmit);
4616
4617 conn->smb1.server.capabilities = server_capabilities;
4618 conn->smb1.capabilities = capabilities;
4619
4620 conn->smb1.server.max_xmit = server_max_xmit;
4621 conn->smb1.max_xmit = max_xmit;
4622
4623 conn->smb1.server.max_mux = server_max_mux;
4624
4625 conn->smb1.server.security_mode = server_security_mode;
4626
4627 conn->smb1.server.readbraw = server_readbraw;
4628 conn->smb1.server.writebraw = server_writebraw;
4629 conn->smb1.server.lockread = server_lockread;
4630 conn->smb1.server.writeunlock = server_writeunlock;
4631
4632 conn->smb1.server.session_key = server_session_key;
4633
4634 talloc_steal(conn, server_gss_blob.data);
4635 conn->smb1.server.gss_blob = server_gss_blob;
4636 conn->smb1.server.guid = server_guid;
4637 memcpy(conn->smb1.server.challenge, server_challenge, 8);
4638 conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
4639 conn->smb1.server.name = talloc_move(conn, &server_name);
4640
4641 conn->smb1.server.time_zone = server_time_zone;
4642 conn->smb1.server.system_time = server_system_time;
4643
4644 tevent_req_done(req);
4645 }
4646
4647 static size_t smbXcli_padding_helper(uint32_t offset, size_t n)
4648 {
4649 if ((offset & (n-1)) == 0) return 0;
4650 return n - (offset & (n-1));
4651 }
4652
4653 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
4654 {
4655 size_t i;
4656 uint8_t *buf;
4657 uint16_t dialect_count = 0;
4658 DATA_BLOB dyn = data_blob_null;
4659
4660 for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4661 bool ok;
4662 uint8_t val[2];
4663
4664 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
4665 continue;
4666 }
4667
4668 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
4669 continue;
4670 }
4671
4672 SSVAL(val, 0, smb2cli_prots[i].smb2_dialect);
4673
4674 ok = data_blob_append(state, &dyn, val, sizeof(val));
4675 if (!ok) {
4676 return NULL;
4677 }
4678
4679 dialect_count++;
4680 }
4681
4682 buf = state->smb2.fixed;
4683 SSVAL(buf, 0, 36);
4684 SSVAL(buf, 2, dialect_count);
4685 SSVAL(buf, 4, state->conn->smb2.client.security_mode);
4686 SSVAL(buf, 6, 0); /* Reserved */
4687 if (state->conn->max_protocol >= PROTOCOL_SMB2_22) {
4688 SIVAL(buf, 8, state->conn->smb2.client.capabilities);
4689 } else {
4690 SIVAL(buf, 8, 0); /* Capabilities */
4691 }
4692 if (state->conn->max_protocol >= PROTOCOL_SMB2_10) {
4693 NTSTATUS status;
4694 DATA_BLOB blob;
4695
4696 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
4697 state, &blob);
4698 if (!NT_STATUS_IS_OK(status)) {
4699 return NULL;
4700 }
4701 memcpy(buf+12, blob.data, 16); /* ClientGuid */
4702 } else {
4703 memset(buf+12, 0, 16); /* ClientGuid */
4704 }
4705
4706 if (state->conn->max_protocol >= PROTOCOL_SMB3_10) {
4707 NTSTATUS status;
4708 struct smb2_negotiate_contexts c = { .num_contexts = 0, };
4709 uint32_t offset;
4710 DATA_BLOB b;
4711 uint8_t p[38];
4712 const uint8_t zeros[8] = {0, };
4713 size_t pad;
4714 bool ok;
4715
4716 SSVAL(p, 0, 1); /* HashAlgorithmCount */
4717 SSVAL(p, 2, 32); /* SaltLength */
4718 SSVAL(p, 4, SMB2_PREAUTH_INTEGRITY_SHA512);
4719 generate_random_buffer(p + 6, 32);
4720
4721 b = data_blob_const(p, 38);
4722 status = smb2_negotiate_context_add(state, &c,
4723 SMB2_PREAUTH_INTEGRITY_CAPABILITIES, b);
4724 if (!NT_STATUS_IS_OK(status)) {
4725 return NULL;
4726 }
4727
4728 SSVAL(p, 0, 2); /* ChiperCount */
4729 /*
4730 * For now we preferr CCM because our implementation
4731 * is faster than GCM, see bug #11451.
4732 */
4733 SSVAL(p, 2, SMB2_ENCRYPTION_AES128_CCM);
4734 SSVAL(p, 4, SMB2_ENCRYPTION_AES128_GCM);
4735
4736 b = data_blob_const(p, 6);
4737 status = smb2_negotiate_context_add(state, &c,
4738 SMB2_ENCRYPTION_CAPABILITIES, b);
4739 if (!NT_STATUS_IS_OK(status)) {
4740 return NULL;
4741 }
4742
4743 status = smb2_negotiate_context_push(state, &b, c);
4744 if (!NT_STATUS_IS_OK(status)) {
4745 return NULL;
4746 }
4747
4748 offset = SMB2_HDR_BODY + sizeof(state->smb2.fixed) + dyn.length;
4749 pad = smbXcli_padding_helper(offset, 8);
4750
4751 ok = data_blob_append(state, &dyn, zeros, pad);
4752 if (!ok) {
4753 return NULL;
4754 }
4755 offset += pad;
4756
4757 ok = data_blob_append(state, &dyn, b.data, b.length);
4758 if (!ok) {
4759 return NULL;
4760 }
4761
4762 SIVAL(buf, 28, offset); /* NegotiateContextOffset */
4763 SSVAL(buf, 32, c.num_contexts); /* NegotiateContextCount */
4764 SSVAL(buf, 34, 0); /* Reserved */
4765 } else {
4766 SBVAL(buf, 28, 0); /* Reserved/ClientStartTime */
4767 }
4768
4769 return smb2cli_req_send(state, state->ev,
4770 state->conn, SMB2_OP_NEGPROT,
4771 0, 0, /* flags */
4772 state->timeout_msec,
4773 NULL, NULL, /* tcon, session */
4774 state->smb2.fixed, sizeof(state->smb2.fixed),
4775 dyn.data, dyn.length,
4776 UINT16_MAX); /* max_dyn_len */
4777 }
4778
4779 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
4780 {
4781 struct tevent_req *req =
4782 tevent_req_callback_data(subreq,
4783 struct tevent_req);
4784 struct smbXcli_negprot_state *state =
4785 tevent_req_data(req,
4786 struct smbXcli_negprot_state);
4787 struct smbXcli_conn *conn = state->conn;
4788 size_t security_offset, security_length;
4789 DATA_BLOB blob;
4790 NTSTATUS status;
4791 struct iovec *iov;
4792 uint8_t *body;
4793 size_t i;
4794 uint16_t dialect_revision;
4795 struct smb2_negotiate_contexts c = { .num_contexts = 0, };
4796 uint32_t negotiate_context_offset = 0;
4797 uint16_t negotiate_context_count = 0;
4798 DATA_BLOB negotiate_context_blob = data_blob_null;
4799 size_t avail;
4800 size_t ctx_ofs;
4801 size_t needed;
4802 struct smb2_negotiate_context *preauth = NULL;
4803 uint16_t hash_count;
4804 uint16_t salt_length;
4805 uint16_t hash_selected;
4806 struct hc_sha512state sctx;
4807 struct smb2_negotiate_context *cipher = NULL;
4808 struct iovec sent_iov[3];
4809 static const struct smb2cli_req_expected_response expected[] = {
4810 {
4811 .status = NT_STATUS_OK,
4812 .body_size = 0x41
4813 }
4814 };
4815
4816 status = smb2cli_req_recv(subreq, state, &iov,
4817 expected, ARRAY_SIZE(expected));
4818 if (tevent_req_nterror(req, status)) {
4819 return;
4820 }
4821
4822 body = (uint8_t *)iov[1].iov_base;
4823
4824 dialect_revision = SVAL(body, 4);
4825
4826 for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4827 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
4828 continue;
4829 }
4830
4831 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
4832 continue;
4833 }
4834
4835 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
4836 continue;
4837 }
4838
4839 conn->protocol = smb2cli_prots[i].proto;
4840 break;
4841 }
4842
4843 if (conn->protocol == PROTOCOL_NONE) {
4844 TALLOC_FREE(subreq);
4845
4846 if (state->conn->min_protocol >= PROTOCOL_SMB2_02) {
4847 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4848 return;
4849 }
4850
4851 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
4852 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4853 return;
4854 }
4855
4856 /* make sure we do not loop forever */
4857 state->conn->min_protocol = PROTOCOL_SMB2_02;
4858
4859 /*
4860 * send a SMB2 negprot, in order to negotiate
4861 * the SMB2 dialect.
4862 */
4863 subreq = smbXcli_negprot_smb2_subreq(state);
4864 if (tevent_req_nomem(subreq, req)) {
4865 return;
4866 }
4867 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4868 return;
4869 }
4870
4871 conn->smb2.server.security_mode = SVAL(body, 2);
4872 if (conn->protocol >= PROTOCOL_SMB3_10) {
4873 negotiate_context_count = SVAL(body, 6);
4874 }
4875
4876 blob = data_blob_const(body + 8, 16);
4877 status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
4878 if (tevent_req_nterror(req, status)) {
4879 return;
4880 }
4881
4882 conn->smb2.server.capabilities = IVAL(body, 24);
4883 conn->smb2.server.max_trans_size= IVAL(body, 28);
4884 conn->smb2.server.max_read_size = IVAL(body, 32);
4885 conn->smb2.server.max_write_size= IVAL(body, 36);
4886 conn->smb2.server.system_time = BVAL(body, 40);
4887 conn->smb2.server.start_time = BVAL(body, 48);
4888
4889 security_offset = SVAL(body, 56);
4890 security_length = SVAL(body, 58);
4891
4892 if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
4893 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4894 return;
4895 }
4896
4897 if (security_length > iov[2].iov_len) {
4898 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4899 return;
4900 }
4901
4902 conn->smb2.server.gss_blob = data_blob_talloc(conn,
4903 iov[2].iov_base,
4904 security_length);
4905 if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
4906 return;
4907 }
4908
4909 if (conn->protocol < PROTOCOL_SMB3_10) {
4910 TALLOC_FREE(subreq);
4911
4912 if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) {
4913 conn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
4914 }
4915 tevent_req_done(req);
4916 return;
4917 }
4918
4919 /*
4920 * Here we are now at SMB3_11, so encryption should be
4921 * negotiated via context, not capabilities.
4922 */
4923
4924 if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) {
4925 /*
4926 * Server set SMB2_CAP_ENCRYPTION capability,
4927 * but *SHOULD* not, not *MUST* not. Just mask it off.
4928 * NetApp seems to do this:
4929 * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13009
4930 */
4931 conn->smb2.server.capabilities &= ~SMB2_CAP_ENCRYPTION;
4932 }
4933
4934 negotiate_context_offset = IVAL(body, 60);
4935 if (negotiate_context_offset < security_offset) {
4936 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4937 return;
4938 }
4939
4940 ctx_ofs = negotiate_context_offset - security_offset;
4941 if (ctx_ofs > iov[2].iov_len) {
4942 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4943 return;
4944 }
4945 avail = iov[2].iov_len - security_length;
4946 needed = iov[2].iov_len - ctx_ofs;
4947 if (needed > avail) {
4948 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4949 return;
4950 }
4951
4952 negotiate_context_blob.data = (uint8_t *)iov[2].iov_base;
4953 negotiate_context_blob.length = iov[2].iov_len;
4954
4955 negotiate_context_blob.data += ctx_ofs;
4956 negotiate_context_blob.length -= ctx_ofs;
4957
4958 status = smb2_negotiate_context_parse(state, negotiate_context_blob, &c);
4959 if (tevent_req_nterror(req, status)) {
4960 return;
4961 }
4962
4963 if (negotiate_context_count != c.num_contexts) {
4964 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4965 return;
4966 }
4967
4968 preauth = smb2_negotiate_context_find(&c,
4969 SMB2_PREAUTH_INTEGRITY_CAPABILITIES);
4970 if (preauth == NULL) {
4971 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4972 return;
4973 }
4974
4975 if (preauth->data.length < 6) {
4976 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4977 return;
4978 }
4979
4980 hash_count = SVAL(preauth->data.data, 0);
4981 salt_length = SVAL(preauth->data.data, 2);
4982 hash_selected = SVAL(preauth->data.data, 4);
4983
4984 if (hash_count != 1) {
4985 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4986 return;
4987 }
4988
4989 if (preauth->data.length != (6 + salt_length)) {
4990 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4991 return;
4992 }
4993
4994 if (hash_selected != SMB2_PREAUTH_INTEGRITY_SHA512) {
4995 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4996 return;
4997 }
4998
4999 cipher = smb2_negotiate_context_find(&c, SMB2_ENCRYPTION_CAPABILITIES);
5000 if (cipher != NULL) {
5001 uint16_t cipher_count;
5002
5003 if (cipher->data.length < 2) {
5004 tevent_req_nterror(req,
5005 NT_STATUS_INVALID_NETWORK_RESPONSE);
5006 return;
5007 }
5008
5009 cipher_count = SVAL(cipher->data.data, 0);
5010
5011 if (cipher_count > 1) {
5012 tevent_req_nterror(req,
5013 NT_STATUS_INVALID_NETWORK_RESPONSE);
5014 return;
5015 }
5016
5017 if (cipher->data.length != (2 + 2 * cipher_count)) {
5018 tevent_req_nterror(req,
5019 NT_STATUS_INVALID_NETWORK_RESPONSE);
5020 return;
5021 }
5022
5023 if (cipher_count == 1) {
5024 uint16_t cipher_selected;
5025
5026 cipher_selected = SVAL(cipher->data.data, 2);
5027
5028 switch (cipher_selected) {
5029 case SMB2_ENCRYPTION_AES128_GCM:
5030 case SMB2_ENCRYPTION_AES128_CCM:
5031 conn->smb2.server.cipher = cipher_selected;
5032 break;
5033 }
5034 }
5035 }
5036
5037 /* First we hash the request */
5038 smb2cli_req_get_sent_iov(subreq, sent_iov);
5039 samba_SHA512_Init(&sctx);
5040 samba_SHA512_Update(&sctx, conn->smb2.preauth_sha512,
5041 sizeof(conn->smb2.preauth_sha512));
5042 for (i = 0; i < 3; i++) {
5043 samba_SHA512_Update(&sctx, sent_iov[i].iov_base, sent_iov[i].iov_len);
5044 }
5045 samba_SHA512_Final(conn->smb2.preauth_sha512, &sctx);
5046 TALLOC_FREE(subreq);
5047
5048 /* And now we hash the response */
5049 samba_SHA512_Init(&sctx);
5050 samba_SHA512_Update(&sctx, conn->smb2.preauth_sha512,
5051 sizeof(conn->smb2.preauth_sha512));
5052 for (i = 0; i < 3; i++) {
5053 samba_SHA512_Update(&sctx, iov[i].iov_base, iov[i].iov_len);
5054 }
5055 samba_SHA512_Final(conn->smb2.preauth_sha512, &sctx);
5056
5057 tevent_req_done(req);
5058 }
5059
5060 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
5061 TALLOC_CTX *tmp_mem,
5062 uint8_t *inbuf)
5063 {
5064 size_t num_pending = talloc_array_length(conn->pending);
5065 struct tevent_req *subreq;
5066 struct smbXcli_req_state *substate;
5067 struct tevent_req *req;
5068 uint32_t protocol_magic;
5069 size_t inbuf_len = smb_len_nbt(inbuf);
5070
5071 if (num_pending != 1) {
5072 return NT_STATUS_INTERNAL_ERROR;
5073 }
5074
5075 if (inbuf_len < 4) {
5076 return NT_STATUS_INVALID_NETWORK_RESPONSE;
5077 }
5078
5079 subreq = conn->pending[0];
5080 substate = tevent_req_data(subreq, struct smbXcli_req_state);
5081 req = tevent_req_callback_data(subreq, struct tevent_req);
5082
5083 protocol_magic = IVAL(inbuf, 4);
5084
5085 switch (protocol_magic) {
5086 case SMB_MAGIC:
5087 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
5088 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
5089 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
5090
5091 case SMB2_MAGIC:
5092 if (substate->smb2.recv_iov == NULL) {
5093 /*
5094 * For the SMB1 negprot we have move it.
5095 */
5096 substate->smb2.recv_iov = substate->smb1.recv_iov;
5097 substate->smb1.recv_iov = NULL;
5098 }
5099
5100 /*
5101 * we got an SMB2 answer, which consumed sequence number 0
5102 * so we need to use 1 as the next one.
5103 *
5104 * we also need to set the current credits to 0
5105 * as we consumed the initial one. The SMB2 answer
5106 * hopefully grant us a new credit.
5107 */
5108 conn->smb2.mid = 1;
5109 conn->smb2.cur_credits = 0;
5110 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
5111 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
5112 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
5113 }
5114
5115 DEBUG(10, ("Got non-SMB PDU\n"));
5116 return NT_STATUS_INVALID_NETWORK_RESPONSE;
5117 }
5118
5119 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
5120 {
5121 return tevent_req_simple_recv_ntstatus(req);
5122 }
5123
5124 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
5125 uint32_t timeout_msec,
5126 enum protocol_types min_protocol,
5127 enum protocol_types max_protocol)
5128 {
5129 TALLOC_CTX *frame = talloc_stackframe();
5130 struct tevent_context *ev;
5131 struct tevent_req *req;
5132 NTSTATUS status = NT_STATUS_NO_MEMORY;
5133 bool ok;
5134
5135 if (smbXcli_conn_has_async_calls(conn)) {
5136 /*
5137 * Can't use sync call while an async call is in flight
5138 */
5139 status = NT_STATUS_INVALID_PARAMETER_MIX;
5140 goto fail;
5141 }
5142 ev = samba_tevent_context_init(frame);
5143 if (ev == NULL) {
5144 goto fail;
5145 }
5146 req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
5147 min_protocol, max_protocol,
5148 WINDOWS_CLIENT_PURE_SMB2_NEGPROT_INITIAL_CREDIT_ASK);
5149 if (req == NULL) {
5150 goto fail;
5151 }
5152 ok = tevent_req_poll_ntstatus(req, ev, &status);
5153 if (!ok) {
5154 goto fail;
5155 }
5156 status = smbXcli_negprot_recv(req);
5157 fail:
5158 TALLOC_FREE(frame);
5159 return status;
5160 }
5161
5162 struct smb2cli_validate_negotiate_info_state {
5163 struct smbXcli_conn *conn;
5164 DATA_BLOB in_input_buffer;
5165 DATA_BLOB in_output_buffer;
5166 DATA_BLOB out_input_buffer;
5167 DATA_BLOB out_output_buffer;
5168 uint16_t dialect;
5169 };
5170
5171 static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq);
5172
5173 struct tevent_req *smb2cli_validate_negotiate_info_send(TALLOC_CTX *mem_ctx,
5174 struct tevent_context *ev,
5175 struct smbXcli_conn *conn,
5176 uint32_t timeout_msec,
5177 struct smbXcli_session *session,
5178 struct smbXcli_tcon *tcon)
5179 {
5180 struct tevent_req *req;
5181 struct smb2cli_validate_negotiate_info_state *state;
5182 uint8_t *buf;
5183 uint16_t dialect_count = 0;
5184 struct tevent_req *subreq;
5185 bool _save_should_sign;
5186 size_t i;
5187
5188 req = tevent_req_create(mem_ctx, &state,
5189 struct smb2cli_validate_negotiate_info_state);
5190 if (req == NULL) {
5191 return NULL;
5192 }
5193 state->conn = conn;
5194
5195 state->in_input_buffer = data_blob_talloc_zero(state,
5196 4 + 16 + 1 + 1 + 2);
5197 if (tevent_req_nomem(state->in_input_buffer.data, req)) {
5198 return tevent_req_post(req, ev);
5199 }
5200 buf = state->in_input_buffer.data;
5201
5202 if (state->conn->max_protocol >= PROTOCOL_SMB2_22) {
5203 SIVAL(buf, 0, conn->smb2.client.capabilities);
5204 } else {
5205 SIVAL(buf, 0, 0); /* Capabilities */
5206 }
5207 if (state->conn->max_protocol >= PROTOCOL_SMB2_10) {
5208 NTSTATUS status;
5209 DATA_BLOB blob;
5210
5211 status = GUID_to_ndr_blob(&conn->smb2.client.guid,
5212 state, &blob);
5213 if (!NT_STATUS_IS_OK(status)) {
5214 return NULL;
5215 }
5216 memcpy(buf+4, blob.data, 16); /* ClientGuid */
5217 } else {
5218 memset(buf+4, 0, 16); /* ClientGuid */
5219 }
5220 if (state->conn->min_protocol >= PROTOCOL_SMB2_02) {
5221 SCVAL(buf, 20, conn->smb2.client.security_mode);
5222 } else {
5223 SCVAL(buf, 20, 0);
5224 }
5225 SCVAL(buf, 21, 0); /* reserved */
5226
5227 for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
5228 bool ok;
5229 size_t ofs;
5230
5231 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
5232 continue;
5233 }
5234
5235 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
5236 continue;
5237 }
5238
5239 if (smb2cli_prots[i].proto == state->conn->protocol) {
5240 state->dialect = smb2cli_prots[i].smb2_dialect;
5241 }
5242
5243 ofs = state->in_input_buffer.length;
5244 ok = data_blob_realloc(state, &state->in_input_buffer,
5245 ofs + 2);
5246 if (!ok) {
5247 tevent_req_oom(req);
5248 return tevent_req_post(req, ev);
5249 }
5250
5251 buf = state->in_input_buffer.data;
5252 SSVAL(buf, ofs, smb2cli_prots[i].smb2_dialect);
5253
5254 dialect_count++;
5255 }
5256 buf = state->in_input_buffer.data;
5257 SSVAL(buf, 22, dialect_count);
5258
5259 _save_should_sign = smb2cli_tcon_is_signing_on(tcon);
5260 smb2cli_tcon_should_sign(tcon, true);
5261 subreq = smb2cli_ioctl_send(state, ev, conn,
5262 timeout_msec, session, tcon,
5263 UINT64_MAX, /* in_fid_persistent */
5264 UINT64_MAX, /* in_fid_volatile */
5265 FSCTL_VALIDATE_NEGOTIATE_INFO,
5266 0, /* in_max_input_length */
5267 &state->in_input_buffer,
5268 24, /* in_max_output_length */
5269 &state->in_output_buffer,
5270 SMB2_IOCTL_FLAG_IS_FSCTL);
5271 smb2cli_tcon_should_sign(tcon, _save_should_sign);
5272 if (tevent_req_nomem(subreq, req)) {
5273 return tevent_req_post(req, ev);
5274 }
5275 tevent_req_set_callback(subreq,
5276 smb2cli_validate_negotiate_info_done,
5277 req);
5278
5279 return req;
5280 }
5281
5282 static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq)
5283 {
5284 struct tevent_req *req =
5285 tevent_req_callback_data(subreq,
5286 struct tevent_req);
5287 struct smb2cli_validate_negotiate_info_state *state =
5288 tevent_req_data(req,
5289 struct smb2cli_validate_negotiate_info_state);
5290 NTSTATUS status;
5291 const uint8_t *buf;
5292 uint32_t capabilities;
5293 DATA_BLOB guid_blob;
5294 struct GUID server_guid;
5295 uint16_t security_mode;
5296 uint16_t dialect;
5297
5298 status = smb2cli_ioctl_recv(subreq, state,
5299 &state->out_input_buffer,
5300 &state->out_output_buffer);
5301 TALLOC_FREE(subreq);
5302 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED)) {
5303 /*
5304 * The response was signed, but not supported
5305 *
5306 * Older Windows and Samba releases return
5307 * NT_STATUS_FILE_CLOSED.
5308 */
5309 tevent_req_done(req);
5310 return;
5311 }
5312 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_DEVICE_REQUEST)) {
5313 /*
5314 * The response was signed, but not supported
5315 *
5316 * This is returned by the NTVFS based Samba 4.x file server
5317 * for file shares.
5318 */
5319 tevent_req_done(req);
5320 return;
5321 }
5322 if (NT_STATUS_EQUAL(status, NT_STATUS_FS_DRIVER_REQUIRED)) {
5323 /*
5324 * The response was signed, but not supported
5325 *
5326 * This is returned by the NTVFS based Samba 4.x file server
5327 * for ipc shares.
5328 */
5329 tevent_req_done(req);
5330 return;
5331 }
5332 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
5333 /*
5334 * The response was signed, but not supported
5335 *
5336 * This might be returned by older Windows versions or by
5337 * NetApp SMB server implementations.
5338 *
5339 * See
5340 *
5341 * https://blogs.msdn.microsoft.com/openspecification/2012/06/28/smb3-secure-dialect-negotiation/
5342 *
5343 */
5344 tevent_req_done(req);
5345 return;
5346 }
5347 if (tevent_req_nterror(req, status)) {
5348 return;
5349 }
5350
5351 if (state->out_output_buffer.length != 24) {
5352 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
5353 return;
5354 }
5355
5356 buf = state->out_output_buffer.data;
5357
5358 capabilities = IVAL(buf, 0);
5359 guid_blob = data_blob_const(buf + 4, 16);
5360 status = GUID_from_data_blob(&guid_blob, &server_guid);
5361 if (tevent_req_nterror(req, status)) {
5362 return;
5363 }
5364 security_mode = CVAL(buf, 20);
5365 dialect = SVAL(buf, 22);
5366
5367 if (capabilities != state->conn->smb2.server.capabilities) {
5368 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5369 return;
5370 }
5371
5372 if (!GUID_equal(&server_guid, &state->conn->smb2.server.guid)) {
5373 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5374 return;
5375 }
5376
5377 if (security_mode != state->conn->smb2.server.security_mode) {
5378 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5379 return;
5380 }
5381
5382 if (dialect != state->dialect) {
5383 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5384 return;
5385 }
5386
5387 tevent_req_done(req);
5388 }
5389
5390 NTSTATUS smb2cli_validate_negotiate_info_recv(struct tevent_req *req)
5391 {
5392 return tevent_req_simple_recv_ntstatus(req);
5393 }
5394
5395 static int smbXcli_session_destructor(struct smbXcli_session *session)
5396 {
5397 if (session->conn == NULL) {
5398 return 0;
5399 }
5400
5401 DLIST_REMOVE(session->conn->sessions, session);
5402 return 0;
5403 }
5404
5405 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
5406 struct smbXcli_conn *conn)
5407 {
5408 struct smbXcli_session *session;
5409
5410 session = talloc_zero(mem_ctx, struct smbXcli_session);
5411 if (session == NULL) {
5412 return NULL;
5413 }
5414 session->smb2 = talloc_zero(session, struct smb2cli_session);
5415 if (session->smb2 == NULL) {
5416 talloc_free(session);
5417 return NULL;
5418 }
5419 talloc_set_destructor(session, smbXcli_session_destructor);
5420
5421 DLIST_ADD_END(conn->sessions, session);
5422 session->conn = conn;
5423
5424 memcpy(session->smb2_channel.preauth_sha512,
5425 conn->smb2.preauth_sha512,
5426 sizeof(session->smb2_channel.preauth_sha512));
5427
5428 return session;
5429 }
5430
5431 struct smbXcli_session *smbXcli_session_copy(TALLOC_CTX *mem_ctx,
5432 struct smbXcli_session *src)
5433 {
5434 struct smbXcli_session *session;
5435
5436 session = talloc_zero(mem_ctx, struct smbXcli_session);
5437 if (session == NULL) {
5438 return NULL;
5439 }
5440 session->smb2 = talloc_zero(session, struct smb2cli_session);
5441 if (session->smb2 == NULL) {
5442 talloc_free(session);
5443 return NULL;
5444 }
5445
5446 session->conn = src->conn;
5447 *session->smb2 = *src->smb2;
5448 session->smb2_channel = src->smb2_channel;
5449 session->disconnect_expired = src->disconnect_expired;
5450
5451 DLIST_ADD_END(src->conn->sessions, session);
5452 talloc_set_destructor(session, smbXcli_session_destructor);
5453
5454 return session;
5455 }
5456
5457 bool smbXcli_session_is_guest(struct smbXcli_session *session)
5458 {
5459 if (session == NULL) {
5460 return false;
5461 }
5462
5463 if (session->conn == NULL) {
5464 return false;
5465 }
5466
5467 if (session->conn->mandatory_signing) {
5468 return false;
5469 }
5470
5471 if (session->conn->protocol >= PROTOCOL_SMB2_02) {
5472 if (session->smb2->session_flags & SMB2_SESSION_FLAG_IS_GUEST) {
5473 return true;
5474 }
5475 return false;
5476 }
5477
5478 if (session->smb1.action & SMB_SETUP_GUEST) {
5479 return true;
5480 }
5481
5482 return false;
5483 }
5484
5485 bool smbXcli_session_is_authenticated(struct smbXcli_session *session)
5486 {
5487 const DATA_BLOB *application_key;
5488
5489 if (session == NULL) {
5490 return false;
5491 }
5492
5493 if (session->conn == NULL) {
5494 return false;
5495 }
5496
5497 /*
5498 * If we have an application key we had a session key negotiated
5499 * at auth time.
5500 */
5501 if (session->conn->protocol >= PROTOCOL_SMB2_02) {
5502 application_key = &session->smb2->application_key;
5503 } else {
5504 application_key = &session->smb1.application_key;
5505 }
5506
5507 if (application_key->length == 0) {
5508 return false;
5509 }
5510
5511 return true;
5512 }
5513
5514 NTSTATUS smbXcli_session_application_key(struct smbXcli_session *session,
5515 TALLOC_CTX *mem_ctx,
5516 DATA_BLOB *key)
5517 {
5518 const DATA_BLOB *application_key;
5519
5520 *key = data_blob_null;
5521
5522 if (session->conn == NULL) {
5523 return NT_STATUS_NO_USER_SESSION_KEY;
5524 }
5525
5526 if (session->conn->protocol >= PROTOCOL_SMB2_02) {
5527 application_key = &session->smb2->application_key;
5528 } else {
5529 application_key = &session->smb1.application_key;
5530 }
5531
5532 if (application_key->length == 0) {
5533 return NT_STATUS_NO_USER_SESSION_KEY;
5534 }
5535
5536 *key = data_blob_dup_talloc(mem_ctx, *application_key);
5537 if (key->data == NULL) {
5538 return NT_STATUS_NO_MEMORY;
5539 }
5540
5541 return NT_STATUS_OK;
5542 }
5543
5544 void smbXcli_session_set_disconnect_expired(struct smbXcli_session *session)
5545 {
5546 session->disconnect_expired = true;
5547 }
5548
5549 uint16_t smb1cli_session_current_id(struct smbXcli_session *session)
5550 {
5551 return session->smb1.session_id;
5552 }
5553
5554 void smb1cli_session_set_id(struct smbXcli_session *session,
5555 uint16_t session_id)
5556 {
5557 session->smb1.session_id = session_id;
5558 }
5559
5560 void smb1cli_session_set_action(struct smbXcli_session *session,
5561 uint16_t action)
5562 {
5563 session->smb1.action = action;
5564 }
5565
5566 NTSTATUS smb1cli_session_set_session_key(struct smbXcli_session *session,
5567 const DATA_BLOB _session_key)
5568 {
5569 struct smbXcli_conn *conn = session->conn;
5570 uint8_t session_key[16];
5571
5572 if (conn == NULL) {
5573 return NT_STATUS_INVALID_PARAMETER_MIX;
5574 }
5575
5576 if (session->smb1.application_key.length != 0) {
5577 /*
5578 * TODO: do not allow this...
5579 *
5580 * return NT_STATUS_INVALID_PARAMETER_MIX;
5581 */
5582 data_blob_clear_free(&session->smb1.application_key);
5583 session->smb1.protected_key = false;
5584 }
5585
5586 if (_session_key.length == 0) {
5587 return NT_STATUS_OK;
5588 }
5589
5590 ZERO_STRUCT(session_key);
5591 memcpy(session_key, _session_key.data,
5592 MIN(_session_key.length, sizeof(session_key)));
5593
5594 session->smb1.application_key = data_blob_talloc(session,
5595 session_key,
5596 sizeof(session_key));
5597 ZERO_STRUCT(session_key);
5598 if (session->smb1.application_key.data == NULL) {
5599 return NT_STATUS_NO_MEMORY;
5600 }
5601
5602 session->smb1.protected_key = false;
5603
5604 return NT_STATUS_OK;
5605 }
5606
5607 NTSTATUS smb1cli_session_protect_session_key(struct smbXcli_session *session)
5608 {
5609 if (session->smb1.protected_key) {
5610 /* already protected */
5611 return NT_STATUS_OK;
5612 }
5613
5614 if (session->smb1.application_key.length != 16) {
5615 return NT_STATUS_INVALID_PARAMETER_MIX;
5616 }
5617
5618 smb_key_derivation(session->smb1.application_key.data,
5619 session->smb1.application_key.length,
5620 session->smb1.application_key.data);
5621
5622 session->smb1.protected_key = true;
5623
5624 return NT_STATUS_OK;
5625 }
5626
5627 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
5628 {
5629 struct smbXcli_conn *conn = session->conn;
5630 uint8_t security_mode = 0;
5631
5632 if (conn == NULL) {
5633 return security_mode;
5634 }
5635
5636 security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
5637 if (conn->mandatory_signing) {
5638 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
5639 }
5640 if (session->smb2->should_sign) {
5641 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
5642 }
5643
5644 return security_mode;
5645 }
5646
5647 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
5648 {
5649 return session->smb2->session_id;
5650 }
5651
5652 uint16_t smb2cli_session_get_flags(struct smbXcli_session *session)
5653 {
5654 return session->smb2->session_flags;
5655 }
5656
5657 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
5658 uint64_t session_id,
5659 uint16_t session_flags)
5660 {
5661 session->smb2->session_id = session_id;
5662 session->smb2->session_flags = session_flags;
5663 }
5664
5665 void smb2cli_session_increment_channel_sequence(struct smbXcli_session *session)
5666 {
5667 session->smb2->channel_sequence += 1;
5668 }
5669
5670 uint16_t smb2cli_session_reset_channel_sequence(struct smbXcli_session *session,
5671 uint16_t channel_sequence)
5672 {
5673 uint16_t prev_cs;
5674
5675 prev_cs = session->smb2->channel_sequence;
5676 session->smb2->channel_sequence = channel_sequence;
5677
5678 return prev_cs;
5679 }
5680
5681 uint16_t smb2cli_session_current_channel_sequence(struct smbXcli_session *session)
5682 {
5683 return session->smb2->channel_sequence;
5684 }
5685
5686 void smb2cli_session_start_replay(struct smbXcli_session *session)
5687 {
5688 session->smb2->replay_active = true;
5689 }
5690
5691 void smb2cli_session_stop_replay(struct smbXcli_session *session)
5692 {
5693 session->smb2->replay_active = false;
5694 }
5695
5696 NTSTATUS smb2cli_session_update_preauth(struct smbXcli_session *session,
5697 const struct iovec *iov)
5698 {
5699 struct hc_sha512state sctx;
5700 size_t i;
5701
5702 if (session->conn == NULL) {
5703 return NT_STATUS_INTERNAL_ERROR;
5704 }
5705
5706 if (session->conn->protocol < PROTOCOL_SMB3_10) {
5707 return NT_STATUS_OK;
5708 }
5709
5710 if (session->smb2_channel.signing_key.length != 0) {
5711 return NT_STATUS_OK;
5712 }
5713
5714 samba_SHA512_Init(&sctx);
5715 samba_SHA512_Update(&sctx, session->smb2_channel.preauth_sha512,
5716 sizeof(session->smb2_channel.preauth_sha512));
5717 for (i = 0; i < 3; i++) {
5718 samba_SHA512_Update(&sctx, iov[i].iov_base, iov[i].iov_len);
5719 }
5720 samba_SHA512_Final(session->smb2_channel.preauth_sha512, &sctx);
5721
5722 return NT_STATUS_OK;
5723 }
5724
5725 NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
5726 const DATA_BLOB _session_key,
5727 const struct iovec *recv_iov)
5728 {
5729 struct smbXcli_conn *conn = session->conn;
5730 uint16_t no_sign_flags = 0;
5731 uint8_t session_key[16];
5732 bool check_signature = true;
5733 uint32_t hdr_flags;
5734 NTSTATUS status;
5735 struct _derivation {
5736 DATA_BLOB label;
5737 DATA_BLOB context;
5738 };
5739 struct {
5740 struct _derivation signing;
5741 struct _derivation encryption;
5742 struct _derivation decryption;
5743 struct _derivation application;
5744 } derivation = { };
5745 size_t nonce_size = 0;
5746
5747 if (conn == NULL) {
5748 return NT_STATUS_INVALID_PARAMETER_MIX;
5749 }
5750
5751 if (recv_iov[0].iov_len != SMB2_HDR_BODY) {
5752 return NT_STATUS_INVALID_PARAMETER_MIX;
5753 }
5754
5755 if (!conn->mandatory_signing) {
5756 /*
5757 * only allow guest sessions without
5758 * mandatory signing.
5759 *
5760 * If we try an authentication with username != ""
5761 * and the server let us in without verifying the
5762 * password we don't have a negotiated session key
5763 * for signing.
5764 */
5765 no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST;
5766 }
5767
5768 if (session->smb2->session_flags & no_sign_flags) {
5769 session->smb2->should_sign = false;
5770 return NT_STATUS_OK;
5771 }
5772
5773 if (session->smb2->signing_key.length != 0) {
5774 return NT_STATUS_INVALID_PARAMETER_MIX;
5775 }
5776
5777 if (conn->protocol >= PROTOCOL_SMB3_10) {
5778 struct _derivation *d;
5779 DATA_BLOB p;
5780
5781 p = data_blob_const(session->smb2_channel.preauth_sha512,
5782 sizeof(session->smb2_channel.preauth_sha512));
5783
5784 d = &derivation.signing;
5785 d->label = data_blob_string_const_null("SMBSigningKey");
5786 d->context = p;
5787
5788 d = &derivation.encryption;
5789 d->label = data_blob_string_const_null("SMBC2SCipherKey");
5790 d->context = p;
5791
5792 d = &derivation.decryption;
5793 d->label = data_blob_string_const_null("SMBS2CCipherKey");
5794 d->context = p;
5795
5796 d = &derivation.application;
5797 d->label = data_blob_string_const_null("SMBAppKey");
5798 d->context = p;
5799
5800 } else if (conn->protocol >= PROTOCOL_SMB2_24) {
5801 struct _derivation *d;
5802
5803 d = &derivation.signing;
5804 d->label = data_blob_string_const_null("SMB2AESCMAC");
5805 d->context = data_blob_string_const_null("SmbSign");
5806
5807 d = &derivation.encryption;
5808 d->label = data_blob_string_const_null("SMB2AESCCM");
5809 d->context = data_blob_string_const_null("ServerIn ");
5810
5811 d = &derivation.decryption;
5812 d->label = data_blob_string_const_null("SMB2AESCCM");
5813 d->context = data_blob_string_const_null("ServerOut");
5814
5815 d = &derivation.application;
5816 d->label = data_blob_string_const_null("SMB2APP");
5817 d->context = data_blob_string_const_null("SmbRpc");
5818 }
5819
5820 ZERO_STRUCT(session_key);
5821 memcpy(session_key, _session_key.data,
5822 MIN(_session_key.length, sizeof(session_key)));
5823
5824 session->smb2->signing_key = data_blob_talloc(session,
5825 session_key,
5826 sizeof(session_key));
5827 if (session->smb2->signing_key.data == NULL) {
5828 ZERO_STRUCT(session_key);
5829 return NT_STATUS_NO_MEMORY;
5830 }
5831
5832 if (conn->protocol >= PROTOCOL_SMB2_24) {
5833 struct _derivation *d = &derivation.signing;
5834
5835 smb2_key_derivation(session_key, sizeof(session_key),
5836 d->label.data, d->label.length,
5837 d->context.data, d->context.length,
5838 session->smb2->signing_key.data);
5839 }
5840
5841 session->smb2->encryption_key = data_blob_dup_talloc(session,
5842 session->smb2->signing_key);
5843 if (session->smb2->encryption_key.data == NULL) {
5844 ZERO_STRUCT(session_key);
5845 return NT_STATUS_NO_MEMORY;
5846 }
5847
5848 if (conn->protocol >= PROTOCOL_SMB2_24) {
5849 struct _derivation *d = &derivation.encryption;
5850
5851 smb2_key_derivation(session_key, sizeof(session_key),
5852 d->label.data, d->label.length,
5853 d->context.data, d->context.length,
5854 session->smb2->encryption_key.data);
5855 }
5856
5857 session->smb2->decryption_key = data_blob_dup_talloc(session,
5858 session->smb2->signing_key);
5859 if (session->smb2->decryption_key.data == NULL) {
5860 ZERO_STRUCT(session_key);
5861 return NT_STATUS_NO_MEMORY;
5862 }
5863
5864 if (conn->protocol >= PROTOCOL_SMB2_24) {
5865 struct _derivation *d = &derivation.decryption;
5866
5867 smb2_key_derivation(session_key, sizeof(session_key),
5868 d->label.data, d->label.length,
5869 d->context.data, d->context.length,
5870 session->smb2->decryption_key.data);
5871 }
5872
5873 session->smb2->application_key = data_blob_dup_talloc(session,
5874 session->smb2->signing_key);
5875 if (session->smb2->application_key.data == NULL) {
5876 ZERO_STRUCT(session_key);
5877 return NT_STATUS_NO_MEMORY;
5878 }
5879
5880 if (conn->protocol >= PROTOCOL_SMB2_24) {
5881 struct _derivation *d = &derivation.application;
5882
5883 smb2_key_derivation(session_key, sizeof(session_key),
5884 d->label.data, d->label.length,
5885 d->context.data, d->context.length,
5886 session->smb2->application_key.data);
5887 }
5888 ZERO_STRUCT(session_key);
5889
5890 session->smb2_channel.signing_key = data_blob_dup_talloc(session,
5891 session->smb2->signing_key);
5892 if (session->smb2_channel.signing_key.data == NULL) {
5893 return NT_STATUS_NO_MEMORY;
5894 }
5895
5896 check_signature = conn->mandatory_signing;
5897
5898 hdr_flags = IVAL(recv_iov[0].iov_base, SMB2_HDR_FLAGS);
5899 if (hdr_flags & SMB2_HDR_FLAG_SIGNED) {
5900 /*
5901 * Sadly some vendors don't sign the
5902 * final SMB2 session setup response
5903 *
5904 * At least Windows and Samba are always doing this
5905 * if there's a session key available.
5906 *
5907 * We only check the signature if it's mandatory
5908 * or SMB2_HDR_FLAG_SIGNED is provided.
5909 */
5910 check_signature = true;
5911 }
5912
5913 if (conn->protocol >= PROTOCOL_SMB3_10) {
5914 check_signature = true;
5915 }
5916
5917 if (check_signature) {
5918 status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
5919 session->conn->protocol,
5920 recv_iov, 3);
5921 if (!NT_STATUS_IS_OK(status)) {
5922 return status;
5923 }
5924 }
5925
5926 session->smb2->should_sign = false;
5927 session->smb2->should_encrypt = false;
5928
5929 if (conn->desire_signing) {
5930 session->smb2->should_sign = true;
5931 }
5932
5933 if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
5934 session->smb2->should_sign = true;
5935 }
5936
5937 if (session->smb2->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
5938 session->smb2->should_encrypt = true;
5939 }
5940
5941 if (conn->protocol < PROTOCOL_SMB2_24) {
5942 session->smb2->should_encrypt = false;
5943 }
5944
5945 if (conn->smb2.server.cipher == 0) {
5946 session->smb2->should_encrypt = false;
5947 }
5948
5949 /*
5950 * CCM and GCM algorithms must never have their
5951 * nonce wrap, or the security of the whole
5952 * communication and the keys is destroyed.
5953 * We must drop the connection once we have
5954 * transfered too much data.
5955 *
5956 * NOTE: We assume nonces greater than 8 bytes.
5957 */
5958 generate_random_buffer((uint8_t *)&session->smb2->nonce_high_random,
5959 sizeof(session->smb2->nonce_high_random));
5960 switch (conn->smb2.server.cipher) {
5961 case SMB2_ENCRYPTION_AES128_CCM:
5962 nonce_size = AES_CCM_128_NONCE_SIZE;
5963 break;
5964 case SMB2_ENCRYPTION_AES128_GCM:
5965 nonce_size = AES_GCM_128_IV_SIZE;
5966 break;
5967 default:
5968 nonce_size = 0;
5969 break;
5970 }
5971 session->smb2->nonce_high_max = SMB2_NONCE_HIGH_MAX(nonce_size);
5972 session->smb2->nonce_high = 0;
5973 session->smb2->nonce_low = 0;
5974
5975 return NT_STATUS_OK;
5976 }
5977
5978 NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx,
5979 struct smbXcli_session *session1,
5980 struct smbXcli_conn *conn,
5981 struct smbXcli_session **_session2)
5982 {
5983 struct smbXcli_session *session2;
5984
5985 if (session1->smb2->signing_key.length == 0) {
5986 return NT_STATUS_INVALID_PARAMETER_MIX;
5987 }
5988
5989 if (conn == NULL) {
5990 return NT_STATUS_INVALID_PARAMETER_MIX;
5991 }
5992
5993 session2 = talloc_zero(mem_ctx, struct smbXcli_session);
5994 if (session2 == NULL) {
5995 return NT_STATUS_NO_MEMORY;
5996 }
5997 session2->smb2 = talloc_reference(session2, session1->smb2);
5998 if (session2->smb2 == NULL) {
5999 talloc_free(session2);
6000 return NT_STATUS_NO_MEMORY;
6001 }
6002
6003 talloc_set_destructor(session2, smbXcli_session_destructor);
6004 DLIST_ADD_END(conn->sessions, session2);
6005 session2->conn = conn;
6006
6007 memcpy(session2->smb2_channel.preauth_sha512,
6008 conn->smb2.preauth_sha512,
6009 sizeof(session2->smb2_channel.preauth_sha512));
6010
6011 *_session2 = session2;
6012 return NT_STATUS_OK;
6013 }
6014
6015 NTSTATUS smb2cli_session_set_channel_key(struct smbXcli_session *session,
6016 const DATA_BLOB _channel_key,
6017 const struct iovec *recv_iov)
6018 {
6019 struct smbXcli_conn *conn = session->conn;
6020 uint8_t channel_key[16];
6021 NTSTATUS status;
6022 struct _derivation {
6023 DATA_BLOB label;
6024 DATA_BLOB context;
6025 };
6026 struct {
6027 struct _derivation signing;
6028 } derivation = { };
6029
6030 if (conn == NULL) {
6031 return NT_STATUS_INVALID_PARAMETER_MIX;
6032 }
6033
6034 if (session->smb2_channel.signing_key.length != 0) {
6035 return NT_STATUS_INVALID_PARAMETER_MIX;
6036 }
6037
6038 if (conn->protocol >= PROTOCOL_SMB3_10) {
6039 struct _derivation *d;
6040 DATA_BLOB p;
6041
6042 p = data_blob_const(session->smb2_channel.preauth_sha512,
6043 sizeof(session->smb2_channel.preauth_sha512));
6044
6045 d = &derivation.signing;
6046 d->label = data_blob_string_const_null("SMBSigningKey");
6047 d->context = p;
6048 } else if (conn->protocol >= PROTOCOL_SMB2_24) {
6049 struct _derivation *d;
6050
6051 d = &derivation.signing;
6052 d->label = data_blob_string_const_null("SMB2AESCMAC");
6053 d->context = data_blob_string_const_null("SmbSign");
6054 }
6055
6056 ZERO_STRUCT(channel_key);
6057 memcpy(channel_key, _channel_key.data,
6058 MIN(_channel_key.length, sizeof(channel_key)));
6059
6060 session->smb2_channel.signing_key = data_blob_talloc(session,
6061 channel_key,
6062 sizeof(channel_key));
6063 if (session->smb2_channel.signing_key.data == NULL) {
6064 ZERO_STRUCT(channel_key);
6065 return NT_STATUS_NO_MEMORY;
6066 }
6067
6068 if (conn->protocol >= PROTOCOL_SMB2_24) {
6069 struct _derivation *d = &derivation.signing;
6070
6071 smb2_key_derivation(channel_key, sizeof(channel_key),
6072 d->label.data, d->label.length,
6073 d->context.data, d->context.length,
6074 session->smb2_channel.signing_key.data);
6075 }
6076 ZERO_STRUCT(channel_key);
6077
6078 status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
6079 session->conn->protocol,
6080 recv_iov, 3);
6081 if (!NT_STATUS_IS_OK(status)) {
6082 return status;
6083 }
6084
6085 return NT_STATUS_OK;
6086 }
6087
6088 NTSTATUS smb2cli_session_encryption_on(struct smbXcli_session *session)
6089 {
6090 if (!session->smb2->should_sign) {
6091 /*
6092 * We need required signing on the session
6093 * in order to prevent man in the middle attacks.
6094 */
6095 return NT_STATUS_INVALID_PARAMETER_MIX;
6096 }
6097
6098 if (session->smb2->should_encrypt) {
6099 return NT_STATUS_OK;
6100 }
6101
6102 if (session->conn->protocol < PROTOCOL_SMB2_24) {
6103 return NT_STATUS_NOT_SUPPORTED;
6104 }
6105
6106 if (session->conn->smb2.server.cipher == 0) {
6107 return NT_STATUS_NOT_SUPPORTED;
6108 }
6109
6110 if (session->smb2->signing_key.data == NULL) {
6111 return NT_STATUS_NOT_SUPPORTED;
6112 }
6113 session->smb2->should_encrypt = true;
6114 return NT_STATUS_OK;
6115 }
6116
6117 struct smbXcli_tcon *smbXcli_tcon_create(TALLOC_CTX *mem_ctx)
6118 {
6119 struct smbXcli_tcon *tcon;
6120
6121 tcon = talloc_zero(mem_ctx, struct smbXcli_tcon);
6122 if (tcon == NULL) {
6123 return NULL;
6124 }
6125
6126 return tcon;
6127 }
6128
6129 /*
6130 * Return a deep structure copy of a struct smbXcli_tcon *
6131 */
6132
6133 struct smbXcli_tcon *smbXcli_tcon_copy(TALLOC_CTX *mem_ctx,
6134 const struct smbXcli_tcon *tcon_in)
6135 {
6136 struct smbXcli_tcon *tcon;
6137
6138 tcon = talloc_memdup(mem_ctx, tcon_in, sizeof(struct smbXcli_tcon));
6139 if (tcon == NULL) {
6140 return NULL;
6141 }
6142
6143 /* Deal with the SMB1 strings. */
6144 if (tcon_in->smb1.service != NULL) {
6145 tcon->smb1.service = talloc_strdup(tcon, tcon_in->smb1.service);
6146 if (tcon->smb1.service == NULL) {
6147 TALLOC_FREE(tcon);
6148 return NULL;
6149 }
6150 }
6151 if (tcon->smb1.fs_type != NULL) {
6152 tcon->smb1.fs_type = talloc_strdup(tcon, tcon_in->smb1.fs_type);
6153 if (tcon->smb1.fs_type == NULL) {
6154 TALLOC_FREE(tcon);
6155 return NULL;
6156 }
6157 }
6158 return tcon;
6159 }
6160
6161 void smbXcli_tcon_set_fs_attributes(struct smbXcli_tcon *tcon,
6162 uint32_t fs_attributes)
6163 {
6164 tcon->fs_attributes = fs_attributes;
6165 }
6166
6167 uint32_t smbXcli_tcon_get_fs_attributes(struct smbXcli_tcon *tcon)
6168 {
6169 return tcon->fs_attributes;
6170 }
6171
6172 bool smbXcli_tcon_is_dfs_share(struct smbXcli_tcon *tcon)
6173 {
6174 if (tcon == NULL) {
6175 return false;
6176 }
6177
6178 if (tcon->is_smb1) {
6179 if (tcon->smb1.optional_support & SMB_SHARE_IN_DFS) {
6180 return true;
6181 }
6182
6183 return false;
6184 }
6185
6186 if (tcon->smb2.capabilities & SMB2_SHARE_CAP_DFS) {
6187 return true;
6188 }
6189
6190 return false;
6191 }
6192
6193 uint16_t smb1cli_tcon_current_id(struct smbXcli_tcon *tcon)
6194 {
6195 return tcon->smb1.tcon_id;
6196 }
6197
6198 void smb1cli_tcon_set_id(struct smbXcli_tcon *tcon, uint16_t tcon_id)
6199 {
6200 tcon->is_smb1 = true;
6201 tcon->smb1.tcon_id = tcon_id;
6202 }
6203
6204 bool smb1cli_tcon_set_values(struct smbXcli_tcon *tcon,
6205 uint16_t tcon_id,
6206 uint16_t optional_support,
6207 uint32_t maximal_access,
6208 uint32_t guest_maximal_access,
6209 const char *service,
6210 const char *fs_type)
6211 {
6212 tcon->is_smb1 = true;
6213 tcon->fs_attributes = 0;
6214 tcon->smb1.tcon_id = tcon_id;
6215 tcon->smb1.optional_support = optional_support;
6216 tcon->smb1.maximal_access = maximal_access;
6217 tcon->smb1.guest_maximal_access = guest_maximal_access;
6218
6219 TALLOC_FREE(tcon->smb1.service);
6220 tcon->smb1.service = talloc_strdup(tcon, service);
6221 if (service != NULL && tcon->smb1.service == NULL) {
6222 return false;
6223 }
6224
6225 TALLOC_FREE(tcon->smb1.fs_type);
6226 tcon->smb1.fs_type = talloc_strdup(tcon, fs_type);
6227 if (fs_type != NULL && tcon->smb1.fs_type == NULL) {
6228 return false;
6229 }
6230
6231 return true;
6232 }
6233
6234 uint32_t smb2cli_tcon_current_id(struct smbXcli_tcon *tcon)
6235 {
6236 return tcon->smb2.tcon_id;
6237 }
6238
6239 void smb2cli_tcon_set_id(struct smbXcli_tcon *tcon, uint32_t tcon_id)
6240 {
6241 tcon->smb2.tcon_id = tcon_id;
6242 }
6243
6244 uint32_t smb2cli_tcon_capabilities(struct smbXcli_tcon *tcon)
6245 {
6246 return tcon->smb2.capabilities;
6247 }
6248
6249 uint32_t smb2cli_tcon_flags(struct smbXcli_tcon *tcon)
6250 {
6251 return tcon->smb2.flags;
6252 }
6253
6254 void smb2cli_tcon_set_values(struct smbXcli_tcon *tcon,
6255 struct smbXcli_session *session,
6256 uint32_t tcon_id,
6257 uint8_t type,
6258 uint32_t flags,
6259 uint32_t capabilities,
6260 uint32_t maximal_access)
6261 {
6262 tcon->is_smb1 = false;
6263 tcon->fs_attributes = 0;
6264 tcon->smb2.tcon_id = tcon_id;
6265 tcon->smb2.type = type;
6266 tcon->smb2.flags = flags;
6267 tcon->smb2.capabilities = capabilities;
6268 tcon->smb2.maximal_access = maximal_access;
6269
6270 tcon->smb2.should_sign = false;
6271 tcon->smb2.should_encrypt = false;
6272
6273 if (session == NULL) {
6274 return;
6275 }
6276
6277 tcon->smb2.should_sign = session->smb2->should_sign;
6278 tcon->smb2.should_encrypt = session->smb2->should_encrypt;
6279
6280 if (flags & SMB2_SHAREFLAG_ENCRYPT_DATA) {
6281 tcon->smb2.should_encrypt = true;
6282 }
6283 }
6284
6285 void smb2cli_tcon_should_sign(struct smbXcli_tcon *tcon,
6286 bool should_sign)
6287 {
6288 tcon->smb2.should_sign = should_sign;
6289 }
6290
6291 bool smb2cli_tcon_is_signing_on(struct smbXcli_tcon *tcon)
6292 {
6293 if (tcon->smb2.should_encrypt) {
6294 return true;
6295 }
6296
6297 return tcon->smb2.should_sign;
6298 }
6299
6300 void smb2cli_tcon_should_encrypt(struct smbXcli_tcon *tcon,
6301 bool should_encrypt)
6302 {
6303 tcon->smb2.should_encrypt = should_encrypt;
6304 }
6305
6306 bool smb2cli_tcon_is_encryption_on(struct smbXcli_tcon *tcon)
6307 {
6308 return tcon->smb2.should_encrypt;
6309 }
6310
6311 void smb2cli_conn_set_mid(struct smbXcli_conn *conn, uint64_t mid)
6312 {
6313 conn->smb2.mid = mid;
6314 }
6315
6316 uint64_t smb2cli_conn_get_mid(struct smbXcli_conn *conn)
6317 {
6318 return conn->smb2.mid;
6319 }
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