1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
|
/*
Unix SMB/CIFS implementation.
Infrastructure for async SMB client requests
Copyright (C) Volker Lendecke 2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libsmb/libsmb.h"
#include "../lib/async_req/async_sock.h"
#include "../lib/util/tevent_ntstatus.h"
#include "../lib/util/tevent_unix.h"
#include "async_smb.h"
#include "smb_crypt.h"
#include "libsmb/nmblib.h"
#include "read_smb.h"
static NTSTATUS cli_pull_raw_error(const uint8_t *buf)
{
uint32_t flags2 = SVAL(buf, smb_flg2);
NTSTATUS status = NT_STATUS(IVAL(buf, smb_rcls));
if (NT_STATUS_IS_OK(status)) {
return NT_STATUS_OK;
}
if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
return status;
}
return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
}
/**
* Figure out if there is an andx command behind the current one
* @param[in] buf The smb buffer to look at
* @param[in] ofs The offset to the wct field that is followed by the cmd
* @retval Is there a command following?
*/
static bool have_andx_command(const char *buf, uint16_t ofs)
{
uint8_t wct;
size_t buflen = talloc_get_size(buf);
if ((ofs == buflen-1) || (ofs == buflen)) {
return false;
}
wct = CVAL(buf, ofs);
if (wct < 2) {
/*
* Not enough space for the command and a following pointer
*/
return false;
}
return (CVAL(buf, ofs+1) != 0xff);
}
#define MAX_SMB_IOV 5
struct cli_smb_state {
struct tevent_context *ev;
struct cli_state *cli;
uint8_t header[smb_wct+1]; /* Space for the header including the wct */
/*
* For normal requests, cli_smb_req_send chooses a mid. Secondary
* trans requests need to use the mid of the primary request, so we
* need a place to store it. Assume it's set if != 0.
*/
uint16_t mid;
uint16_t *vwv;
uint8_t bytecount_buf[2];
struct iovec iov[MAX_SMB_IOV+3];
int iov_count;
uint8_t *inbuf;
uint32_t seqnum;
int chain_num;
int chain_length;
struct tevent_req **chained_requests;
bool one_way;
};
static uint16_t cli_alloc_mid(struct cli_state *cli)
{
int num_pending = talloc_array_length(cli->conn.pending);
uint16_t result;
while (true) {
int i;
result = cli->conn.smb1.mid++;
if ((result == 0) || (result == 0xffff)) {
continue;
}
for (i=0; i<num_pending; i++) {
if (result == cli_smb_req_mid(cli->conn.pending[i])) {
break;
}
}
if (i == num_pending) {
return result;
}
}
}
void cli_smb_req_unset_pending(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
struct cli_state *cli = state->cli;
int num_pending = talloc_array_length(cli->conn.pending);
int i;
if (state->mid != 0) {
/*
* This is a [nt]trans[2] request which waits
* for more than one reply.
*/
return;
}
talloc_set_destructor(req, NULL);
if (num_pending == 1) {
/*
* The pending read_smb tevent_req is a child of
* cli->pending. So if nothing is pending anymore, we need to
* delete the socket read fde.
*/
TALLOC_FREE(cli->conn.pending);
cli->conn.read_smb_req = NULL;
return;
}
for (i=0; i<num_pending; i++) {
if (req == cli->conn.pending[i]) {
break;
}
}
if (i == num_pending) {
/*
* Something's seriously broken. Just returning here is the
* right thing nevertheless, the point of this routine is to
* remove ourselves from cli->conn.pending.
*/
return;
}
/*
* Remove ourselves from the cli->conn.pending array
*/
for (; i < (num_pending - 1); i++) {
cli->conn.pending[i] = cli->conn.pending[i+1];
}
/*
* No NULL check here, we're shrinking by sizeof(void *), and
* talloc_realloc just adjusts the size for this.
*/
cli->conn.pending = talloc_realloc(NULL, cli->conn.pending,
struct tevent_req *,
num_pending - 1);
return;
}
static int cli_smb_req_destructor(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
/*
* Make sure we really remove it from
* the pending array on destruction.
*/
state->mid = 0;
cli_smb_req_unset_pending(req);
return 0;
}
static bool cli_state_receive_next(struct cli_state *cli);
static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status);
bool cli_smb_req_set_pending(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
struct cli_state *cli;
struct tevent_req **pending;
int num_pending;
cli = state->cli;
num_pending = talloc_array_length(cli->conn.pending);
pending = talloc_realloc(cli, cli->conn.pending, struct tevent_req *,
num_pending+1);
if (pending == NULL) {
return false;
}
pending[num_pending] = req;
cli->conn.pending = pending;
talloc_set_destructor(req, cli_smb_req_destructor);
if (!cli_state_receive_next(cli)) {
/*
* the caller should notify the current request
*
* And all other pending requests get notified
* by cli_state_notify_pending().
*/
cli_smb_req_unset_pending(req);
cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
return false;
}
return true;
}
static void cli_smb_received(struct tevent_req *subreq);
static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
TALLOC_CTX *frame,
uint8_t *inbuf);
static bool cli_state_receive_next(struct cli_state *cli)
{
size_t num_pending = talloc_array_length(cli->conn.pending);
struct tevent_req *req;
struct cli_smb_state *state;
if (cli->conn.read_smb_req != NULL) {
return true;
}
if (num_pending == 0) {
return true;
}
req = cli->conn.pending[0];
state = tevent_req_data(req, struct cli_smb_state);
cli->conn.dispatch_incoming = cli_state_dispatch_smb1;
/*
* We're the first ones, add the read_smb request that waits for the
* answer from the server
*/
cli->conn.read_smb_req = read_smb_send(cli->conn.pending, state->ev,
cli->conn.fd);
if (cli->conn.read_smb_req == NULL) {
return false;
}
tevent_req_set_callback(cli->conn.read_smb_req, cli_smb_received, cli);
return true;
}
static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status)
{
cli_state_disconnect(cli);
/*
* Cancel all pending requests. We do not do a for-loop walking
* cli->conn.pending because that array changes in
* cli_smb_req_destructor().
*/
while (talloc_array_length(cli->conn.pending) > 0) {
struct tevent_req *req;
struct cli_smb_state *state;
req = cli->conn.pending[0];
state = tevent_req_data(req, struct cli_smb_state);
/*
* We're dead. No point waiting for trans2
* replies.
*/
state->mid = 0;
cli_smb_req_unset_pending(req);
/*
* we need to defer the callback, because we may notify more
* then one caller.
*/
tevent_req_defer_callback(req, state->ev);
tevent_req_nterror(req, status);
}
}
/*
* Fetch a smb request's mid. Only valid after the request has been sent by
* cli_smb_req_send().
*/
uint16_t cli_smb_req_mid(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
if (state->mid != 0) {
return state->mid;
}
return SVAL(state->header, smb_mid);
}
void cli_smb_req_set_mid(struct tevent_req *req, uint16_t mid)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
state->mid = mid;
}
uint32_t cli_smb_req_seqnum(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
return state->seqnum;
}
void cli_smb_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
state->seqnum = seqnum;
}
static size_t iov_len(const struct iovec *iov, int count)
{
size_t result = 0;
int i;
for (i=0; i<count; i++) {
result += iov[i].iov_len;
}
return result;
}
static uint8_t *iov_concat(TALLOC_CTX *mem_ctx, const struct iovec *iov,
int count)
{
size_t len = iov_len(iov, count);
size_t copied;
uint8_t *buf;
int i;
buf = talloc_array(mem_ctx, uint8_t, len);
if (buf == NULL) {
return NULL;
}
copied = 0;
for (i=0; i<count; i++) {
memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
copied += iov[i].iov_len;
}
return buf;
}
struct tevent_req *cli_smb_req_create(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli,
uint8_t smb_command,
uint8_t additional_flags,
uint8_t wct, uint16_t *vwv,
int iov_count,
struct iovec *bytes_iov)
{
struct tevent_req *result;
struct cli_smb_state *state;
struct timeval endtime;
if (iov_count > MAX_SMB_IOV) {
/*
* Should not happen :-)
*/
return NULL;
}
result = tevent_req_create(mem_ctx, &state, struct cli_smb_state);
if (result == NULL) {
return NULL;
}
state->ev = ev;
state->cli = cli;
state->mid = 0; /* Set to auto-choose in cli_smb_req_send */
state->chain_num = 0;
state->chained_requests = NULL;
cli_setup_packet_buf(cli, (char *)state->header);
SCVAL(state->header, smb_com, smb_command);
SSVAL(state->header, smb_tid, cli->smb1.tid);
SCVAL(state->header, smb_wct, wct);
state->vwv = vwv;
SSVAL(state->bytecount_buf, 0, iov_len(bytes_iov, iov_count));
state->iov[0].iov_base = (void *)state->header;
state->iov[0].iov_len = sizeof(state->header);
state->iov[1].iov_base = (void *)state->vwv;
state->iov[1].iov_len = wct * sizeof(uint16_t);
state->iov[2].iov_base = (void *)state->bytecount_buf;
state->iov[2].iov_len = sizeof(uint16_t);
if (iov_count != 0) {
memcpy(&state->iov[3], bytes_iov,
iov_count * sizeof(*bytes_iov));
}
state->iov_count = iov_count + 3;
if (cli->timeout) {
endtime = timeval_current_ofs_msec(cli->timeout);
if (!tevent_req_set_endtime(result, ev, endtime)) {
return result;
}
}
switch (smb_command) {
case SMBtranss:
case SMBtranss2:
case SMBnttranss:
case SMBntcancel:
state->one_way = true;
break;
case SMBlockingX:
if ((wct == 8) &&
(CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
state->one_way = true;
}
break;
}
return result;
}
static NTSTATUS cli_signv(struct cli_state *cli, struct iovec *iov, int count,
uint32_t *seqnum)
{
uint8_t *buf;
/*
* Obvious optimization: Make cli_calculate_sign_mac work with struct
* iovec directly. MD5Update would do that just fine.
*/
if ((count <= 0) || (iov[0].iov_len < smb_wct)) {
return NT_STATUS_INVALID_PARAMETER;
}
buf = iov_concat(talloc_tos(), iov, count);
if (buf == NULL) {
return NT_STATUS_NO_MEMORY;
}
cli_calculate_sign_mac(cli, (char *)buf, seqnum);
memcpy(iov[0].iov_base, buf, iov[0].iov_len);
TALLOC_FREE(buf);
return NT_STATUS_OK;
}
static void cli_smb_sent(struct tevent_req *subreq);
static NTSTATUS cli_smb_req_iov_send(struct tevent_req *req,
struct cli_smb_state *state,
struct iovec *iov, int iov_count)
{
struct tevent_req *subreq;
NTSTATUS status;
if (!cli_state_is_connected(state->cli)) {
return NT_STATUS_CONNECTION_DISCONNECTED;
}
if (iov[0].iov_len < smb_wct) {
return NT_STATUS_INVALID_PARAMETER;
}
if (state->mid != 0) {
SSVAL(iov[0].iov_base, smb_mid, state->mid);
} else {
uint16_t mid = cli_alloc_mid(state->cli);
SSVAL(iov[0].iov_base, smb_mid, mid);
}
smb_setlen((char *)iov[0].iov_base, iov_len(iov, iov_count) - 4);
status = cli_signv(state->cli, iov, iov_count, &state->seqnum);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (cli_state_encryption_on(state->cli)) {
char *buf, *enc_buf;
buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
if (buf == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = common_encrypt_buffer(state->cli->trans_enc_state,
(char *)buf, &enc_buf);
TALLOC_FREE(buf);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Error in encrypting client message: %s\n",
nt_errstr(status)));
return status;
}
buf = (char *)talloc_memdup(state, enc_buf,
smb_len(enc_buf)+4);
SAFE_FREE(enc_buf);
if (buf == NULL) {
return NT_STATUS_NO_MEMORY;
}
iov[0].iov_base = (void *)buf;
iov[0].iov_len = talloc_get_size(buf);
iov_count = 1;
}
subreq = writev_send(state, state->ev, state->cli->conn.outgoing,
state->cli->conn.fd, false, iov, iov_count);
if (subreq == NULL) {
return NT_STATUS_NO_MEMORY;
}
tevent_req_set_callback(subreq, cli_smb_sent, req);
return NT_STATUS_OK;
}
NTSTATUS cli_smb_req_send(struct tevent_req *req)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
if (!tevent_req_is_in_progress(req)) {
return NT_STATUS_INTERNAL_ERROR;
}
return cli_smb_req_iov_send(req, state, state->iov, state->iov_count);
}
struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli,
uint8_t smb_command,
uint8_t additional_flags,
uint8_t wct, uint16_t *vwv,
uint32_t num_bytes,
const uint8_t *bytes)
{
struct tevent_req *req;
struct iovec iov;
NTSTATUS status;
iov.iov_base = discard_const_p(void, bytes);
iov.iov_len = num_bytes;
req = cli_smb_req_create(mem_ctx, ev, cli, smb_command,
additional_flags, wct, vwv, 1, &iov);
if (req == NULL) {
return NULL;
}
if (!tevent_req_is_in_progress(req)) {
return tevent_req_post(req, ev);
}
status = cli_smb_req_send(req);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return tevent_req_post(req, ev);
}
return req;
}
static void cli_smb_sent(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
ssize_t nwritten;
int err;
nwritten = writev_recv(subreq, &err);
TALLOC_FREE(subreq);
if (nwritten == -1) {
NTSTATUS status = map_nt_error_from_unix(err);
cli_state_notify_pending(state->cli, status);
return;
}
if (state->one_way) {
state->inbuf = NULL;
tevent_req_done(req);
return;
}
if (!cli_smb_req_set_pending(req)) {
tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
return;
}
}
static void cli_smb_received(struct tevent_req *subreq)
{
struct cli_state *cli = tevent_req_callback_data(
subreq, struct cli_state);
TALLOC_CTX *frame = talloc_stackframe();
NTSTATUS status;
uint8_t *inbuf;
ssize_t received;
int err;
if (subreq != cli->conn.read_smb_req) {
DEBUG(1, ("Internal error: cli_smb_received called with "
"unexpected subreq\n"));
status = NT_STATUS_INTERNAL_ERROR;
cli_state_notify_pending(cli, status);
TALLOC_FREE(frame);
return;
}
received = read_smb_recv(subreq, frame, &inbuf, &err);
TALLOC_FREE(subreq);
cli->conn.read_smb_req = NULL;
if (received == -1) {
status = map_nt_error_from_unix(err);
cli_state_notify_pending(cli, status);
TALLOC_FREE(frame);
return;
}
status = cli->conn.dispatch_incoming(cli, frame, inbuf);
TALLOC_FREE(frame);
if (NT_STATUS_IS_OK(status)) {
/*
* We should not do any more processing
* as the dispatch function called
* tevent_req_done().
*/
return;
} else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
/*
* We got an error, so notify all pending requests
*/
cli_state_notify_pending(cli, status);
return;
}
/*
* We got NT_STATUS_RETRY, so we may ask for a
* next incoming pdu.
*/
if (!cli_state_receive_next(cli)) {
cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
}
}
static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
TALLOC_CTX *frame,
uint8_t *inbuf)
{
struct tevent_req *req;
struct cli_smb_state *state;
NTSTATUS status;
int num_pending;
int i;
uint16_t mid;
bool oplock_break;
if ((IVAL(inbuf, 4) != 0x424d53ff) /* 0xFF"SMB" */
&& (SVAL(inbuf, 4) != 0x45ff)) /* 0xFF"E" */ {
DEBUG(10, ("Got non-SMB PDU\n"));
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
if (cli_state_encryption_on(cli) && (CVAL(inbuf, 0) == 0)) {
uint16_t enc_ctx_num;
status = get_enc_ctx_num(inbuf, &enc_ctx_num);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("get_enc_ctx_num returned %s\n",
nt_errstr(status)));
return status;
}
if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
enc_ctx_num,
cli->trans_enc_state->enc_ctx_num));
return NT_STATUS_INVALID_HANDLE;
}
status = common_decrypt_buffer(cli->trans_enc_state,
(char *)inbuf);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("common_decrypt_buffer returned %s\n",
nt_errstr(status)));
return status;
}
}
mid = SVAL(inbuf, smb_mid);
num_pending = talloc_array_length(cli->conn.pending);
for (i=0; i<num_pending; i++) {
if (mid == cli_smb_req_mid(cli->conn.pending[i])) {
break;
}
}
if (i == num_pending) {
/* Dump unexpected reply */
return NT_STATUS_RETRY;
}
oplock_break = false;
if (mid == 0xffff) {
/*
* Paranoia checks that this is really an oplock break request.
*/
oplock_break = (smb_len(inbuf) == 51); /* hdr + 8 words */
oplock_break &= ((CVAL(inbuf, smb_flg) & FLAG_REPLY) == 0);
oplock_break &= (CVAL(inbuf, smb_com) == SMBlockingX);
oplock_break &= (SVAL(inbuf, smb_vwv6) == 0);
oplock_break &= (SVAL(inbuf, smb_vwv7) == 0);
if (!oplock_break) {
/* Dump unexpected reply */
return NT_STATUS_RETRY;
}
}
req = cli->conn.pending[i];
state = tevent_req_data(req, struct cli_smb_state);
if (!oplock_break /* oplock breaks are not signed */
&& !cli_check_sign_mac(cli, (char *)inbuf, state->seqnum+1)) {
DEBUG(10, ("cli_check_sign_mac failed\n"));
return NT_STATUS_ACCESS_DENIED;
}
if (state->chained_requests != NULL) {
struct tevent_req **chain = talloc_move(frame,
&state->chained_requests);
int num_chained = talloc_array_length(chain);
/*
* We steal the inbuf to the chain,
* so that it will stay until all
* requests of the chain are finished.
*
* Each requests in the chain will
* hold a talloc reference to the chain.
* This way we do not expose the talloc_reference()
* behavior to the callers.
*/
talloc_steal(chain, inbuf);
for (i=0; i<num_chained; i++) {
struct tevent_req **ref;
req = chain[i];
state = tevent_req_data(req, struct cli_smb_state);
cli_smb_req_unset_pending(req);
/*
* as we finish multiple requests here
* we need to defer the callbacks as
* they could destroy our current stack state.
*/
tevent_req_defer_callback(req, state->ev);
ref = talloc_reference(state, chain);
if (tevent_req_nomem(ref, req)) {
continue;
}
state->inbuf = inbuf;
state->chain_num = i;
state->chain_length = num_chained;
tevent_req_done(req);
}
return NT_STATUS_RETRY;
}
cli_smb_req_unset_pending(req);
state->inbuf = talloc_move(state, &inbuf);
state->chain_num = 0;
state->chain_length = 1;
if (talloc_array_length(cli->conn.pending) == 0) {
tevent_req_done(req);
return NT_STATUS_OK;
}
tevent_req_defer_callback(req, state->ev);
tevent_req_done(req);
return NT_STATUS_RETRY;
}
NTSTATUS cli_smb_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx, uint8_t **pinbuf,
uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
uint32_t *pnum_bytes, uint8_t **pbytes)
{
struct cli_smb_state *state = tevent_req_data(
req, struct cli_smb_state);
NTSTATUS status = NT_STATUS_OK;
uint8_t cmd, wct;
uint16_t num_bytes;
size_t wct_ofs, bytes_offset;
int i;
if (tevent_req_is_nterror(req, &status)) {
return status;
}
if (state->inbuf == NULL) {
if (min_wct != 0) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
if (pinbuf) {
*pinbuf = NULL;
}
if (pwct) {
*pwct = 0;
}
if (pvwv) {
*pvwv = NULL;
}
if (pnum_bytes) {
*pnum_bytes = 0;
}
if (pbytes) {
*pbytes = NULL;
}
/* This was a request without a reply */
return NT_STATUS_OK;
}
wct_ofs = smb_wct;
cmd = CVAL(state->inbuf, smb_com);
for (i=0; i<state->chain_num; i++) {
if (i < state->chain_num-1) {
if (cmd == 0xff) {
return NT_STATUS_REQUEST_ABORTED;
}
if (!is_andx_req(cmd)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
}
if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
/*
* This request was not completed because a previous
* request in the chain had received an error.
*/
return NT_STATUS_REQUEST_ABORTED;
}
wct_ofs = SVAL(state->inbuf, wct_ofs + 3);
/*
* Skip the all-present length field. No overflow, we've just
* put a 16-bit value into a size_t.
*/
wct_ofs += 4;
if (wct_ofs+2 > talloc_get_size(state->inbuf)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
cmd = CVAL(state->inbuf, wct_ofs + 1);
}
state->cli->raw_status = cli_pull_raw_error(state->inbuf);
if (NT_STATUS_IS_DOS(state->cli->raw_status)) {
uint8_t eclass = NT_STATUS_DOS_CLASS(state->cli->raw_status);
uint16_t ecode = NT_STATUS_DOS_CODE(state->cli->raw_status);
/*
* TODO: is it really a good idea to do a mapping here?
*
* The old cli_pull_error() also does it, so I do not change
* the behavior yet.
*/
status = dos_to_ntstatus(eclass, ecode);
} else {
status = state->cli->raw_status;
}
if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
if ((cmd == SMBsesssetupX)
&& NT_STATUS_EQUAL(
status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
/*
* NT_STATUS_MORE_PROCESSING_REQUIRED is a
* valid return code for session setup
*/
goto no_err;
}
if (NT_STATUS_IS_ERR(status)) {
/*
* The last command takes the error code. All
* further commands down the requested chain
* will get a NT_STATUS_REQUEST_ABORTED.
*/
return status;
}
}
no_err:
wct = CVAL(state->inbuf, wct_ofs);
bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
num_bytes = SVAL(state->inbuf, bytes_offset);
if (wct < min_wct) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
/*
* wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
* is a 16-bit value. So bytes_offset being size_t should be far from
* wrapping.
*/
if ((bytes_offset + 2 > talloc_get_size(state->inbuf))
|| (bytes_offset > 0xffff)) {
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
if (pwct != NULL) {
*pwct = wct;
}
if (pvwv != NULL) {
*pvwv = (uint16_t *)(state->inbuf + wct_ofs + 1);
}
if (pnum_bytes != NULL) {
*pnum_bytes = num_bytes;
}
if (pbytes != NULL) {
*pbytes = (uint8_t *)state->inbuf + bytes_offset + 2;
}
if ((mem_ctx != NULL) && (pinbuf != NULL)) {
if (state->chain_num == state->chain_length-1) {
*pinbuf = talloc_move(mem_ctx, &state->inbuf);
} else {
*pinbuf = state->inbuf;
}
}
return status;
}
size_t cli_smb_wct_ofs(struct tevent_req **reqs, int num_reqs)
{
size_t wct_ofs;
int i;
wct_ofs = smb_wct - 4;
for (i=0; i<num_reqs; i++) {
struct cli_smb_state *state;
state = tevent_req_data(reqs[i], struct cli_smb_state);
wct_ofs += iov_len(state->iov+1, state->iov_count-1);
wct_ofs = (wct_ofs + 3) & ~3;
}
return wct_ofs;
}
NTSTATUS cli_smb_chain_send(struct tevent_req **reqs, int num_reqs)
{
struct cli_smb_state *first_state = tevent_req_data(
reqs[0], struct cli_smb_state);
struct cli_smb_state *last_state = tevent_req_data(
reqs[num_reqs-1], struct cli_smb_state);
struct cli_smb_state *state;
size_t wct_offset;
size_t chain_padding = 0;
int i, iovlen;
struct iovec *iov = NULL;
struct iovec *this_iov;
NTSTATUS status;
iovlen = 0;
for (i=0; i<num_reqs; i++) {
if (!tevent_req_is_in_progress(reqs[i])) {
return NT_STATUS_INTERNAL_ERROR;
}
state = tevent_req_data(reqs[i], struct cli_smb_state);
iovlen += state->iov_count;
}
iov = talloc_array(last_state, struct iovec, iovlen);
if (iov == NULL) {
return NT_STATUS_NO_MEMORY;
}
first_state->chained_requests = (struct tevent_req **)talloc_memdup(
last_state, reqs, sizeof(*reqs) * num_reqs);
if (first_state->chained_requests == NULL) {
TALLOC_FREE(iov);
return NT_STATUS_NO_MEMORY;
}
wct_offset = smb_wct - 4;
this_iov = iov;
for (i=0; i<num_reqs; i++) {
size_t next_padding = 0;
uint16_t *vwv;
state = tevent_req_data(reqs[i], struct cli_smb_state);
if (i < num_reqs-1) {
if (!is_andx_req(CVAL(state->header, smb_com))
|| CVAL(state->header, smb_wct) < 2) {
TALLOC_FREE(iov);
TALLOC_FREE(first_state->chained_requests);
return NT_STATUS_INVALID_PARAMETER;
}
}
wct_offset += iov_len(state->iov+1, state->iov_count-1) + 1;
if ((wct_offset % 4) != 0) {
next_padding = 4 - (wct_offset % 4);
}
wct_offset += next_padding;
vwv = state->vwv;
if (i < num_reqs-1) {
struct cli_smb_state *next_state = tevent_req_data(
reqs[i+1], struct cli_smb_state);
SCVAL(vwv+0, 0, CVAL(next_state->header, smb_com));
SCVAL(vwv+0, 1, 0);
SSVAL(vwv+1, 0, wct_offset);
} else if (is_andx_req(CVAL(state->header, smb_com))) {
/* properly end the chain */
SCVAL(vwv+0, 0, 0xff);
SCVAL(vwv+0, 1, 0xff);
SSVAL(vwv+1, 0, 0);
}
if (i == 0) {
this_iov[0] = state->iov[0];
} else {
/*
* This one is a bit subtle. We have to add
* chain_padding bytes between the requests, and we
* have to also include the wct field of the
* subsequent requests. We use the subsequent header
* for the padding, it contains the wct field in its
* last byte.
*/
this_iov[0].iov_len = chain_padding+1;
this_iov[0].iov_base = (void *)&state->header[
sizeof(state->header) - this_iov[0].iov_len];
memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
}
memcpy(this_iov+1, state->iov+1,
sizeof(struct iovec) * (state->iov_count-1));
this_iov += state->iov_count;
chain_padding = next_padding;
}
status = cli_smb_req_iov_send(reqs[0], last_state, iov, iovlen);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(iov);
TALLOC_FREE(first_state->chained_requests);
return status;
}
return NT_STATUS_OK;
}
bool cli_has_async_calls(struct cli_state *cli)
{
return ((tevent_queue_length(cli->conn.outgoing) != 0)
|| (talloc_array_length(cli->conn.pending) != 0));
}
|