-
Notifications
You must be signed in to change notification settings - Fork 61
/
smb2pdu.c
9569 lines (8352 loc) · 251 KB
/
smb2pdu.c
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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <[email protected]>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/inetdevice.h>
#include <net/addrconf.h>
#include <linux/syscalls.h>
#include <linux/namei.h>
#include <linux/statfs.h>
#include <linux/ethtool.h>
#include <linux/falloc.h>
#include <linux/crc32.h>
#include <linux/mount.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 3, 0)
#include <linux/filelock.h>
#endif
#include "compat.h"
#include "glob.h"
#include "smb2pdu.h"
#include "smbfsctl.h"
#include "oplock.h"
#include "smbacl.h"
#include "auth.h"
#include "asn1.h"
#include "connection.h"
#include "transport_ipc.h"
#include "transport_rdma.h"
#include "vfs.h"
#include "vfs_cache.h"
#include "misc.h"
#include "server.h"
#include "smb_common.h"
#include "smbstatus.h"
#include "ksmbd_work.h"
#include "mgmt/user_config.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
#include "mgmt/user_session.h"
#include "mgmt/ksmbd_ida.h"
#include "ndr.h"
static void __wbuf(struct ksmbd_work *work, void **req, void **rsp)
{
if (work->next_smb2_rcv_hdr_off) {
*req = ksmbd_req_buf_next(work);
*rsp = ksmbd_resp_buf_next(work);
} else {
*req = smb2_get_msg(work->request_buf);
*rsp = smb2_get_msg(work->response_buf);
}
}
#define WORK_BUFFERS(w, rq, rs) __wbuf((w), (void **)&(rq), (void **)&(rs))
/**
* check_session_id() - check for valid session id in smb header
* @conn: connection instance
* @id: session id from smb header
*
* Return: 1 if valid session id, otherwise 0
*/
static inline bool check_session_id(struct ksmbd_conn *conn, u64 id)
{
struct ksmbd_session *sess;
if (id == 0 || id == -1)
return false;
sess = ksmbd_session_lookup_all(conn, id);
if (sess)
return true;
pr_err("Invalid user session id: %llu\n", id);
return false;
}
struct channel *lookup_chann_list(struct ksmbd_session *sess, struct ksmbd_conn *conn)
{
return xa_load(&sess->ksmbd_chann_list, (long)conn);
}
/**
* smb2_get_ksmbd_tcon() - get tree connection information using a tree id.
* @work: smb work
*
* Return: 0 if there is a tree connection matched or these are
* skipable commands, otherwise error
*/
int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
{
struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
unsigned int cmd = le16_to_cpu(req_hdr->Command);
unsigned int tree_id;
if (cmd == SMB2_TREE_CONNECT_HE ||
cmd == SMB2_CANCEL_HE ||
cmd == SMB2_LOGOFF_HE) {
ksmbd_debug(SMB, "skip to check tree connect request\n");
return 0;
}
if (xa_empty(&work->sess->tree_conns)) {
ksmbd_debug(SMB, "NO tree connected\n");
return -ENOENT;
}
tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
/*
* If request is not the first in Compound request,
* Just validate tree id in header with work->tcon->id.
*/
if (work->next_smb2_rcv_hdr_off) {
if (!work->tcon) {
pr_err("The first operation in the compound does not have tcon\n");
return -EINVAL;
}
if (tree_id != UINT_MAX && work->tcon->id != tree_id) {
pr_err("tree id(%u) is different with id(%u) in first operation\n",
tree_id, work->tcon->id);
return -EINVAL;
}
return 1;
}
work->tcon = ksmbd_tree_conn_lookup(work->sess, tree_id);
if (!work->tcon) {
pr_err("Invalid tid %d\n", tree_id);
return -ENOENT;
}
return 1;
}
/**
* smb2_set_err_rsp() - set error response code on smb response
* @work: smb work containing response buffer
*/
void smb2_set_err_rsp(struct ksmbd_work *work)
{
struct smb2_err_rsp *err_rsp;
if (work->next_smb2_rcv_hdr_off)
err_rsp = ksmbd_resp_buf_next(work);
else
err_rsp = smb2_get_msg(work->response_buf);
if (err_rsp->hdr.Status != STATUS_STOPPED_ON_SYMLINK) {
int err;
err_rsp->StructureSize = SMB2_ERROR_STRUCTURE_SIZE2_LE;
err_rsp->ErrorContextCount = 0;
err_rsp->Reserved = 0;
err_rsp->ByteCount = 0;
err_rsp->ErrorData[0] = 0;
err = ksmbd_iov_pin_rsp(work, (void *)err_rsp,
__SMB2_HEADER_STRUCTURE_SIZE +
SMB2_ERROR_STRUCTURE_SIZE2);
if (err)
work->send_no_response = 1;
}
}
/**
* is_smb2_neg_cmd() - is it smb2 negotiation command
* @work: smb work containing smb header
*
* Return: true if smb2 negotiation command, otherwise false
*/
bool is_smb2_neg_cmd(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return false;
/* make sure it is request not response message */
if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
return false;
if (hdr->Command != SMB2_NEGOTIATE)
return false;
return true;
}
/**
* is_smb2_rsp() - is it smb2 response
* @work: smb work containing smb response buffer
*
* Return: true if smb2 response, otherwise false
*/
bool is_smb2_rsp(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->response_buf);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return false;
/* make sure it is response not request message */
if (!(hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR))
return false;
return true;
}
/**
* get_smb2_cmd_val() - get smb command code from smb header
* @work: smb work containing smb request buffer
*
* Return: smb2 request command value
*/
u16 get_smb2_cmd_val(struct ksmbd_work *work)
{
struct smb2_hdr *rcv_hdr;
if (work->next_smb2_rcv_hdr_off)
rcv_hdr = ksmbd_req_buf_next(work);
else
rcv_hdr = smb2_get_msg(work->request_buf);
return le16_to_cpu(rcv_hdr->Command);
}
/**
* set_smb2_rsp_status() - set error response code on smb2 header
* @work: smb work containing response buffer
* @err: error response code
*/
void set_smb2_rsp_status(struct ksmbd_work *work, __le32 err)
{
struct smb2_hdr *rsp_hdr;
rsp_hdr = smb2_get_msg(work->response_buf);
rsp_hdr->Status = err;
work->iov_idx = 0;
work->iov_cnt = 0;
work->next_smb2_rcv_hdr_off = 0;
smb2_set_err_rsp(work);
}
/**
* init_smb2_neg_rsp() - initialize smb2 response for negotiate command
* @work: smb work containing smb request buffer
*
* smb2 negotiate response is sent in reply of smb1 negotiate command for
* dialect auto-negotiation.
*/
int init_smb2_neg_rsp(struct ksmbd_work *work)
{
struct smb2_hdr *rsp_hdr;
struct smb2_negotiate_rsp *rsp;
struct ksmbd_conn *conn = work->conn;
int err;
rsp_hdr = smb2_get_msg(work->response_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = cpu_to_le16(2);
rsp_hdr->Command = SMB2_NEGOTIATE;
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = 0;
rsp_hdr->Id.SyncId.ProcessId = 0;
rsp_hdr->Id.SyncId.TreeId = 0;
rsp_hdr->SessionId = 0;
memset(rsp_hdr->Signature, 0, 16);
rsp = smb2_get_msg(work->response_buf);
WARN_ON(ksmbd_conn_good(conn));
rsp->StructureSize = cpu_to_le16(65);
ksmbd_debug(SMB, "conn->dialect 0x%x\n", conn->dialect);
rsp->DialectRevision = cpu_to_le16(conn->dialect);
/* Not setting conn guid rsp->ServerGUID, as it
* not used by client for identifying connection
*/
rsp->Capabilities = cpu_to_le32(conn->vals->capabilities);
/* Default Max Message Size till SMB2.0, 64K*/
rsp->MaxTransactSize = cpu_to_le32(conn->vals->max_trans_size);
rsp->MaxReadSize = cpu_to_le32(conn->vals->max_read_size);
rsp->MaxWriteSize = cpu_to_le32(conn->vals->max_write_size);
rsp->SystemTime = cpu_to_le64(ksmbd_systime());
rsp->ServerStartTime = 0;
rsp->SecurityBufferOffset = cpu_to_le16(128);
rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
ksmbd_copy_gss_neg_header((char *)(&rsp->hdr) +
le16_to_cpu(rsp->SecurityBufferOffset));
rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
if (server_conf.signing == KSMBD_CONFIG_OPT_MANDATORY)
rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
err = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_negotiate_rsp) +
AUTH_GSS_LENGTH);
if (err)
return err;
conn->use_spnego = true;
ksmbd_conn_set_need_negotiate(conn);
return 0;
}
/**
* smb2_set_rsp_credits() - set number of credits in response buffer
* @work: smb work containing smb response buffer
*/
int smb2_set_rsp_credits(struct ksmbd_work *work)
{
struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
struct smb2_hdr *hdr = ksmbd_resp_buf_next(work);
struct ksmbd_conn *conn = work->conn;
unsigned short credits_requested, aux_max;
unsigned short credit_charge, credits_granted = 0;
if (work->send_no_response)
return 0;
hdr->CreditCharge = req_hdr->CreditCharge;
if (conn->total_credits > conn->vals->max_credits) {
hdr->CreditRequest = 0;
pr_err("Total credits overflow: %d\n", conn->total_credits);
return -EINVAL;
}
credit_charge = max_t(unsigned short,
le16_to_cpu(req_hdr->CreditCharge), 1);
if (credit_charge > conn->total_credits) {
ksmbd_debug(SMB, "Insufficient credits granted, given: %u, granted: %u\n",
credit_charge, conn->total_credits);
return -EINVAL;
}
conn->total_credits -= credit_charge;
conn->outstanding_credits -= credit_charge;
credits_requested = max_t(unsigned short,
le16_to_cpu(req_hdr->CreditRequest), 1);
/* according to smb2.credits smbtorture, Windows server
* 2016 or later grant up to 8192 credits at once.
*
* TODO: Need to adjuct CreditRequest value according to
* current cpu load
*/
if (hdr->Command == SMB2_NEGOTIATE)
aux_max = 1;
else
aux_max = conn->vals->max_credits - conn->total_credits;
credits_granted = min_t(unsigned short, credits_requested, aux_max);
conn->total_credits += credits_granted;
work->credits_granted += credits_granted;
if (!req_hdr->NextCommand) {
/* Update CreditRequest in last request */
hdr->CreditRequest = cpu_to_le16(work->credits_granted);
}
ksmbd_debug(SMB,
"credits: requested[%d] granted[%d] total_granted[%d]\n",
credits_requested, credits_granted,
conn->total_credits);
return 0;
}
/**
* init_chained_smb2_rsp() - initialize smb2 chained response
* @work: smb work containing smb response buffer
*/
static void init_chained_smb2_rsp(struct ksmbd_work *work)
{
struct smb2_hdr *req = ksmbd_req_buf_next(work);
struct smb2_hdr *rsp = ksmbd_resp_buf_next(work);
struct smb2_hdr *rsp_hdr;
struct smb2_hdr *rcv_hdr;
int next_hdr_offset = 0;
int len, new_len;
/* Len of this response = updated RFC len - offset of previous cmd
* in the compound rsp
*/
/* Storing the current local FID which may be needed by subsequent
* command in the compound request
*/
if (req->Command == SMB2_CREATE && rsp->Status == STATUS_SUCCESS) {
work->compound_fid = ((struct smb2_create_rsp *)rsp)->VolatileFileId;
work->compound_pfid = ((struct smb2_create_rsp *)rsp)->PersistentFileId;
work->compound_sid = le64_to_cpu(rsp->SessionId);
}
len = get_rfc1002_len(work->response_buf) - work->next_smb2_rsp_hdr_off;
next_hdr_offset = le32_to_cpu(req->NextCommand);
new_len = ALIGN(len, 8);
work->iov[work->iov_idx].iov_len += (new_len - len);
inc_rfc1001_len(work->response_buf, new_len - len);
rsp->NextCommand = cpu_to_le32(new_len);
work->next_smb2_rcv_hdr_off += next_hdr_offset;
work->curr_smb2_rsp_hdr_off = work->next_smb2_rsp_hdr_off;
work->next_smb2_rsp_hdr_off += new_len;
ksmbd_debug(SMB,
"Compound req new_len = %d rcv off = %d rsp off = %d\n",
new_len, work->next_smb2_rcv_hdr_off,
work->next_smb2_rsp_hdr_off);
rsp_hdr = ksmbd_resp_buf_next(work);
rcv_hdr = ksmbd_req_buf_next(work);
if (!(rcv_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)) {
ksmbd_debug(SMB, "related flag should be set\n");
work->compound_fid = KSMBD_NO_FID;
work->compound_pfid = KSMBD_NO_FID;
}
memset((char *)rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->Command = rcv_hdr->Command;
/*
* Message is response. We don't grant oplock yet.
*/
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR |
SMB2_FLAGS_RELATED_OPERATIONS);
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = rcv_hdr->MessageId;
rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
rsp_hdr->SessionId = rcv_hdr->SessionId;
memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);
}
/**
* is_chained_smb2_message() - check for chained command
* @work: smb work containing smb request buffer
*
* Return: true if chained request, otherwise false
*/
bool is_chained_smb2_message(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
unsigned int len, next_cmd;
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return false;
hdr = ksmbd_req_buf_next(work);
next_cmd = le32_to_cpu(hdr->NextCommand);
if (next_cmd > 0) {
if ((u64)work->next_smb2_rcv_hdr_off + next_cmd +
__SMB2_HEADER_STRUCTURE_SIZE >
get_rfc1002_len(work->request_buf)) {
pr_err("next command(%u) offset exceeds smb msg size\n",
next_cmd);
return false;
}
if ((u64)get_rfc1002_len(work->response_buf) + MAX_CIFS_SMALL_BUFFER_SIZE >
work->response_sz) {
pr_err("next response offset exceeds response buffer size\n");
return false;
}
ksmbd_debug(SMB, "got SMB2 chained command\n");
init_chained_smb2_rsp(work);
return true;
} else if (work->next_smb2_rcv_hdr_off) {
/*
* This is last request in chained command,
* align response to 8 byte
*/
len = ALIGN(get_rfc1002_len(work->response_buf), 8);
len = len - get_rfc1002_len(work->response_buf);
if (len) {
ksmbd_debug(SMB, "padding len %u\n", len);
work->iov[work->iov_idx].iov_len += len;
inc_rfc1001_len(work->response_buf, len);
}
work->curr_smb2_rsp_hdr_off = work->next_smb2_rsp_hdr_off;
}
return false;
}
/**
* init_smb2_rsp_hdr() - initialize smb2 response
* @work: smb work containing smb request buffer
*
* Return: 0
*/
int init_smb2_rsp_hdr(struct ksmbd_work *work)
{
struct smb2_hdr *rsp_hdr = smb2_get_msg(work->response_buf);
struct smb2_hdr *rcv_hdr = smb2_get_msg(work->request_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->Command = rcv_hdr->Command;
/*
* Message is response. We don't grant oplock yet.
*/
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = rcv_hdr->MessageId;
rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
rsp_hdr->SessionId = rcv_hdr->SessionId;
memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);
return 0;
}
/**
* smb2_allocate_rsp_buf() - allocate smb2 response buffer
* @work: smb work containing smb request buffer
*
* Return: 0 on success, otherwise -ENOMEM
*/
int smb2_allocate_rsp_buf(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
size_t small_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
size_t large_sz = small_sz + work->conn->vals->max_trans_size;
size_t sz = small_sz;
int cmd = le16_to_cpu(hdr->Command);
if (cmd == SMB2_IOCTL_HE || cmd == SMB2_QUERY_DIRECTORY_HE)
sz = large_sz;
if (cmd == SMB2_QUERY_INFO_HE) {
struct smb2_query_info_req *req;
if (get_rfc1002_len(work->request_buf) <
offsetof(struct smb2_query_info_req, OutputBufferLength))
return -EINVAL;
req = smb2_get_msg(work->request_buf);
if ((req->InfoType == SMB2_O_INFO_FILE &&
(req->FileInfoClass == FILE_FULL_EA_INFORMATION ||
req->FileInfoClass == FILE_ALL_INFORMATION)) ||
req->InfoType == SMB2_O_INFO_SECURITY)
sz = large_sz;
}
/* allocate large response buf for chained commands */
if (le32_to_cpu(hdr->NextCommand) > 0)
sz = large_sz;
work->response_buf = kvzalloc(sz, GFP_KERNEL);
if (!work->response_buf)
return -ENOMEM;
work->response_sz = sz;
return 0;
}
/**
* smb2_check_user_session() - check for valid session for a user
* @work: smb work containing smb request buffer
*
* Return: 0 on success, otherwise error
*/
int smb2_check_user_session(struct ksmbd_work *work)
{
struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
struct ksmbd_conn *conn = work->conn;
unsigned int cmd = le16_to_cpu(req_hdr->Command);
unsigned long long sess_id;
/*
* SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do not
* require a session id, so no need to validate user session's for
* these commands.
*/
if (cmd == SMB2_ECHO_HE || cmd == SMB2_NEGOTIATE_HE ||
cmd == SMB2_SESSION_SETUP_HE)
return 0;
if (!ksmbd_conn_good(conn))
return -EIO;
sess_id = le64_to_cpu(req_hdr->SessionId);
/*
* If request is not the first in Compound request,
* Just validate session id in header with work->sess->id.
*/
if (work->next_smb2_rcv_hdr_off) {
if (!work->sess) {
pr_err("The first operation in the compound does not have sess\n");
return -EINVAL;
}
if (sess_id != ULLONG_MAX && work->sess->id != sess_id) {
pr_err("session id(%llu) is different with the first operation(%lld)\n",
sess_id, work->sess->id);
return -EINVAL;
}
return 1;
}
/* Check for validity of user session */
work->sess = ksmbd_session_lookup_all(conn, sess_id);
if (work->sess)
return 1;
ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id);
return -ENOENT;
}
/**
* smb2_get_name() - get filename string from on the wire smb format
* @src: source buffer
* @maxlen: maxlen of source string
* @local_nls: nls_table pointer
*
* Return: matching converted filename on success, otherwise error ptr
*/
static char *
smb2_get_name(const char *src, const int maxlen, struct nls_table *local_nls)
{
char *name;
name = smb_strndup_from_utf16(src, maxlen, 1, local_nls);
if (IS_ERR(name)) {
pr_err("failed to get name %ld\n", PTR_ERR(name));
return name;
}
ksmbd_conv_path_to_unix(name);
ksmbd_strip_last_slash(name);
return name;
}
int setup_async_work(struct ksmbd_work *work, void (*fn)(void **), void **arg)
{
struct ksmbd_conn *conn = work->conn;
int id;
id = ksmbd_acquire_async_msg_id(&conn->async_ida);
if (id < 0) {
pr_err("Failed to alloc async message id\n");
return id;
}
work->asynchronous = true;
work->async_id = id;
ksmbd_debug(SMB,
"Send interim Response to inform async request id : %d\n",
work->async_id);
work->cancel_fn = fn;
work->cancel_argv = arg;
if (list_empty(&work->async_request_entry)) {
spin_lock(&conn->request_lock);
list_add_tail(&work->async_request_entry, &conn->async_requests);
spin_unlock(&conn->request_lock);
}
return 0;
}
void release_async_work(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
spin_lock(&conn->request_lock);
list_del_init(&work->async_request_entry);
spin_unlock(&conn->request_lock);
work->asynchronous = 0;
work->cancel_fn = NULL;
kfree(work->cancel_argv);
work->cancel_argv = NULL;
if (work->async_id) {
ksmbd_release_id(&conn->async_ida, work->async_id);
work->async_id = 0;
}
}
void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status)
{
struct smb2_hdr *rsp_hdr;
struct ksmbd_work *in_work = ksmbd_alloc_work_struct();
if (allocate_interim_rsp_buf(in_work)) {
pr_err("smb_allocate_rsp_buf failed!\n");
ksmbd_free_work_struct(in_work);
return;
}
in_work->conn = work->conn;
memcpy(smb2_get_msg(in_work->response_buf), ksmbd_resp_buf_next(work),
__SMB2_HEADER_STRUCTURE_SIZE);
rsp_hdr = smb2_get_msg(in_work->response_buf);
rsp_hdr->Flags |= SMB2_FLAGS_ASYNC_COMMAND;
rsp_hdr->Id.AsyncId = cpu_to_le64(work->async_id);
smb2_set_err_rsp(in_work);
rsp_hdr->Status = status;
ksmbd_conn_write(in_work);
ksmbd_free_work_struct(in_work);
}
static __le32 smb2_get_reparse_tag_special_file(umode_t mode)
{
if (S_ISDIR(mode) || S_ISREG(mode))
return 0;
if (S_ISLNK(mode))
return IO_REPARSE_TAG_LX_SYMLINK_LE;
else if (S_ISFIFO(mode))
return IO_REPARSE_TAG_LX_FIFO_LE;
else if (S_ISSOCK(mode))
return IO_REPARSE_TAG_AF_UNIX_LE;
else if (S_ISCHR(mode))
return IO_REPARSE_TAG_LX_CHR_LE;
else if (S_ISBLK(mode))
return IO_REPARSE_TAG_LX_BLK_LE;
return 0;
}
/**
* smb2_get_dos_mode() - get file mode in dos format from unix mode
* @stat: kstat containing file mode
* @attribute: attribute flags
*
* Return: converted dos mode
*/
static int smb2_get_dos_mode(struct kstat *stat, int attribute)
{
int attr = 0;
if (S_ISDIR(stat->mode)) {
attr = ATTR_DIRECTORY |
(attribute & (ATTR_HIDDEN | ATTR_SYSTEM));
} else {
attr = (attribute & 0x00005137) | ATTR_ARCHIVE;
attr &= ~(ATTR_DIRECTORY);
if (S_ISREG(stat->mode) && (server_conf.share_fake_fscaps &
FILE_SUPPORTS_SPARSE_FILES))
attr |= ATTR_SPARSE;
if (smb2_get_reparse_tag_special_file(stat->mode))
attr |= ATTR_REPARSE;
}
return attr;
}
static void build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt,
__le16 hash_id)
{
pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(38);
pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
pneg_ctxt->Reserved = cpu_to_le32(0);
pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
pneg_ctxt->HashAlgorithms = hash_id;
}
static void build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt,
__le16 cipher_type)
{
pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(4);
pneg_ctxt->Reserved = cpu_to_le32(0);
pneg_ctxt->CipherCount = cpu_to_le16(1);
pneg_ctxt->Ciphers[0] = cipher_type;
}
static void build_sign_cap_ctxt(struct smb2_signing_capabilities *pneg_ctxt,
__le16 sign_algo)
{
pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
pneg_ctxt->DataLength =
cpu_to_le16((sizeof(struct smb2_signing_capabilities) + 2)
- sizeof(struct smb2_neg_context));
pneg_ctxt->Reserved = cpu_to_le32(0);
pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(1);
pneg_ctxt->SigningAlgorithms[0] = sign_algo;
}
static void build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
pneg_ctxt->Name[0] = 0x93;
pneg_ctxt->Name[1] = 0xAD;
pneg_ctxt->Name[2] = 0x25;
pneg_ctxt->Name[3] = 0x50;
pneg_ctxt->Name[4] = 0x9C;
pneg_ctxt->Name[5] = 0xB4;
pneg_ctxt->Name[6] = 0x11;
pneg_ctxt->Name[7] = 0xE7;
pneg_ctxt->Name[8] = 0xB4;
pneg_ctxt->Name[9] = 0x23;
pneg_ctxt->Name[10] = 0x83;
pneg_ctxt->Name[11] = 0xDE;
pneg_ctxt->Name[12] = 0x96;
pneg_ctxt->Name[13] = 0x8B;
pneg_ctxt->Name[14] = 0xCD;
pneg_ctxt->Name[15] = 0x7C;
}
static unsigned int assemble_neg_contexts(struct ksmbd_conn *conn,
struct smb2_negotiate_rsp *rsp)
{
char * const pneg_ctxt = (char *)rsp +
le32_to_cpu(rsp->NegotiateContextOffset);
int neg_ctxt_cnt = 1;
int ctxt_size;
ksmbd_debug(SMB,
"assemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt,
conn->preauth_info->Preauth_HashId);
ctxt_size = sizeof(struct smb2_preauth_neg_context);
if (conn->cipher_type) {
/* Round to 8 byte boundary */
ctxt_size = round_up(ctxt_size, 8);
ksmbd_debug(SMB,
"assemble SMB2_ENCRYPTION_CAPABILITIES context\n");
build_encrypt_ctxt((struct smb2_encryption_neg_context *)
(pneg_ctxt + ctxt_size),
conn->cipher_type);
neg_ctxt_cnt++;
ctxt_size += sizeof(struct smb2_encryption_neg_context) + 2;
}
/* compression context not yet supported */
WARN_ON(conn->compress_algorithm != SMB3_COMPRESS_NONE);
if (conn->posix_ext_supported) {
ctxt_size = round_up(ctxt_size, 8);
ksmbd_debug(SMB,
"assemble SMB2_POSIX_EXTENSIONS_AVAILABLE context\n");
build_posix_ctxt((struct smb2_posix_neg_context *)
(pneg_ctxt + ctxt_size));
neg_ctxt_cnt++;
ctxt_size += sizeof(struct smb2_posix_neg_context);
}
if (conn->signing_negotiated) {
ctxt_size = round_up(ctxt_size, 8);
ksmbd_debug(SMB,
"assemble SMB2_SIGNING_CAPABILITIES context\n");
build_sign_cap_ctxt((struct smb2_signing_capabilities *)
(pneg_ctxt + ctxt_size),
conn->signing_algorithm);
neg_ctxt_cnt++;
ctxt_size += sizeof(struct smb2_signing_capabilities) + 2;
}
rsp->NegotiateContextCount = cpu_to_le16(neg_ctxt_cnt);
return ctxt_size + AUTH_GSS_PADDING;
}
static __le32 decode_preauth_ctxt(struct ksmbd_conn *conn,
struct smb2_preauth_neg_context *pneg_ctxt,
int ctxt_len)
{
/*
* sizeof(smb2_preauth_neg_context) assumes SMB311_SALT_SIZE Salt,
* which may not be present. Only check for used HashAlgorithms[1].
*/
if (ctxt_len <
sizeof(struct smb2_neg_context) + MIN_PREAUTH_CTXT_DATA_LEN)
return STATUS_INVALID_PARAMETER;
if (pneg_ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
return STATUS_NO_PREAUTH_INTEGRITY_HASH_OVERLAP;
conn->preauth_info->Preauth_HashId = SMB2_PREAUTH_INTEGRITY_SHA512;
return STATUS_SUCCESS;
}
static void decode_encrypt_ctxt(struct ksmbd_conn *conn,
struct smb2_encryption_neg_context *pneg_ctxt,
int ctxt_len)
{
int cph_cnt;
int i, cphs_size;
if (sizeof(struct smb2_encryption_neg_context) > ctxt_len) {
pr_err("Invalid SMB2_ENCRYPTION_CAPABILITIES context size\n");
return;
}
conn->cipher_type = 0;
cph_cnt = le16_to_cpu(pneg_ctxt->CipherCount);
cphs_size = cph_cnt * sizeof(__le16);
if (sizeof(struct smb2_encryption_neg_context) + cphs_size >
ctxt_len) {
pr_err("Invalid cipher count(%d)\n", cph_cnt);
return;
}
if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF)
return;
for (i = 0; i < cph_cnt; i++) {
if (pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_GCM ||
pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_CCM ||
pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_CCM ||
pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_GCM) {
ksmbd_debug(SMB, "Cipher ID = 0x%x\n",
pneg_ctxt->Ciphers[i]);
conn->cipher_type = pneg_ctxt->Ciphers[i];
break;
}
}
}
/**
* smb3_encryption_negotiated() - checks if server and client agreed on enabling encryption
* @conn: smb connection
*
* Return: true if connection should be encrypted, else false
*/
bool smb3_encryption_negotiated(struct ksmbd_conn *conn)
{
if (!conn->ops->generate_encryptionkey)
return false;
/*
* SMB 3.0 and 3.0.2 dialects use the SMB2_GLOBAL_CAP_ENCRYPTION flag.
* SMB 3.1.1 uses the cipher_type field.
*/
return (conn->vals->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) ||
conn->cipher_type;
}
static void decode_compress_ctxt(struct ksmbd_conn *conn,
struct smb2_compression_ctx *pneg_ctxt)
{
conn->compress_algorithm = SMB3_COMPRESS_NONE;
}
static void decode_sign_cap_ctxt(struct ksmbd_conn *conn,
struct smb2_signing_capabilities *pneg_ctxt,
int ctxt_len)
{
int sign_algo_cnt;
int i, sign_alos_size;
if (sizeof(struct smb2_signing_capabilities) > ctxt_len) {
pr_err("Invalid SMB2_SIGNING_CAPABILITIES context length\n");
return;
}
conn->signing_negotiated = false;
sign_algo_cnt = le16_to_cpu(pneg_ctxt->SigningAlgorithmCount);
sign_alos_size = sign_algo_cnt * sizeof(__le16);
if (sizeof(struct smb2_signing_capabilities) + sign_alos_size >
ctxt_len) {
pr_err("Invalid signing algorithm count(%d)\n", sign_algo_cnt);
return;
}
for (i = 0; i < sign_algo_cnt; i++) {
if (pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_HMAC_SHA256 ||
pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_AES_CMAC) {
ksmbd_debug(SMB, "Signing Algorithm ID = 0x%x\n",
pneg_ctxt->SigningAlgorithms[i]);
conn->signing_negotiated = true;
conn->signing_algorithm =
pneg_ctxt->SigningAlgorithms[i];
break;
}
}
}
static __le32 deassemble_neg_contexts(struct ksmbd_conn *conn,
struct smb2_negotiate_req *req,
unsigned int len_of_smb)
{
/* +4 is to account for the RFC1001 len field */
struct smb2_neg_context *pctx = (struct smb2_neg_context *)req;
int i = 0, len_of_ctxts;
unsigned int offset = le32_to_cpu(req->NegotiateContextOffset);
unsigned int neg_ctxt_cnt = le16_to_cpu(req->NegotiateContextCount);