summaryrefslogtreecommitdiffstats
path: root/fs/ksmbd/auth.c
blob: dc3d061edda9285e16cc963557f811e975343887 (plain)
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
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
 *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
 */

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/backing-dev.h>
#include <linux/writeback.h>
#include <linux/uio.h>
#include <linux/xattr.h>
#include <crypto/hash.h>
#include <crypto/aead.h>
#include <linux/random.h>
#include <linux/scatterlist.h>

#include "auth.h"
#include "glob.h"

#include <linux/fips.h>
#include <crypto/des.h>

#include "server.h"
#include "smb_common.h"
#include "connection.h"
#include "mgmt/user_session.h"
#include "mgmt/user_config.h"
#include "crypto_ctx.h"
#include "transport_ipc.h"

/*
 * Fixed format data defining GSS header and fixed string
 * "not_defined_in_RFC4178@please_ignore".
 * So sec blob data in neg phase could be generated statically.
 */
static char NEGOTIATE_GSS_HEADER[AUTH_GSS_LENGTH] = {
#ifdef CONFIG_SMB_SERVER_KERBEROS5
	0x60, 0x5e, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05,
	0x05, 0x02, 0xa0, 0x54, 0x30, 0x52, 0xa0, 0x24,
	0x30, 0x22, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
	0xf7, 0x12, 0x01, 0x02, 0x02, 0x06, 0x09, 0x2a,
	0x86, 0x48, 0x82, 0xf7, 0x12, 0x01, 0x02, 0x02,
	0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x82,
	0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a, 0x30, 0x28,
	0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f, 0x74, 0x5f,
	0x64, 0x65, 0x66, 0x69, 0x6e, 0x65, 0x64, 0x5f,
	0x69, 0x6e, 0x5f, 0x52, 0x46, 0x43, 0x34, 0x31,
	0x37, 0x38, 0x40, 0x70, 0x6c, 0x65, 0x61, 0x73,
	0x65, 0x5f, 0x69, 0x67, 0x6e, 0x6f, 0x72, 0x65
#else
	0x60, 0x48, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05,
	0x05, 0x02, 0xa0, 0x3e, 0x30, 0x3c, 0xa0, 0x0e,
	0x30, 0x0c, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04,
	0x01, 0x82, 0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a,
	0x30, 0x28, 0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f,
	0x74, 0x5f, 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65,
	0x64, 0x5f, 0x69, 0x6e, 0x5f, 0x52, 0x46, 0x43,
	0x34, 0x31, 0x37, 0x38, 0x40, 0x70, 0x6c, 0x65,
	0x61, 0x73, 0x65, 0x5f, 0x69, 0x67, 0x6e, 0x6f,
	0x72, 0x65
#endif
};

void ksmbd_copy_gss_neg_header(void *buf)
{
	memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH);
}

/**
 * ksmbd_gen_sess_key() - function to generate session key
 * @sess:	session of connection
 * @hash:	source hash value to be used for find session key
 * @hmac:	source hmac value to be used for finding session key
 *
 */
static int ksmbd_gen_sess_key(struct ksmbd_session *sess, char *hash,
			      char *hmac)
{
	struct ksmbd_crypto_ctx *ctx;
	int rc;

	ctx = ksmbd_crypto_ctx_find_hmacmd5();
	if (!ctx) {
		ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
		return -ENOMEM;
	}

	rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
				 hash,
				 CIFS_HMAC_MD5_HASH_SIZE);
	if (rc) {
		ksmbd_debug(AUTH, "hmacmd5 set key fail error %d\n", rc);
		goto out;
	}

	rc = crypto_shash_init(CRYPTO_HMACMD5(ctx));
	if (rc) {
		ksmbd_debug(AUTH, "could not init hmacmd5 error %d\n", rc);
		goto out;
	}

	rc = crypto_shash_update(CRYPTO_HMACMD5(ctx),
				 hmac,
				 SMB2_NTLMV2_SESSKEY_SIZE);
	if (rc) {
		ksmbd_debug(AUTH, "Could not update with response error %d\n", rc);
		goto out;
	}

	rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), sess->sess_key);
	if (rc) {
		ksmbd_debug(AUTH, "Could not generate hmacmd5 hash error %d\n", rc);
		goto out;
	}

out:
	ksmbd_release_crypto_ctx(ctx);
	return rc;
}

static int calc_ntlmv2_hash(struct ksmbd_session *sess, char *ntlmv2_hash,
			    char *dname)
{
	int ret, len, conv_len;
	wchar_t *domain = NULL;
	__le16 *uniname = NULL;
	struct ksmbd_crypto_ctx *ctx;

	ctx = ksmbd_crypto_ctx_find_hmacmd5();
	if (!ctx) {
		ksmbd_debug(AUTH, "can't generate ntlmv2 hash\n");
		return -ENOMEM;
	}

	ret = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
				  user_passkey(sess->user),
				  CIFS_ENCPWD_SIZE);
	if (ret) {
		ksmbd_debug(AUTH, "Could not set NT Hash as a key\n");
		goto out;
	}

	ret = crypto_shash_init(CRYPTO_HMACMD5(ctx));
	if (ret) {
		ksmbd_debug(AUTH, "could not init hmacmd5\n");
		goto out;
	}

	/* convert user_name to unicode */
	len = strlen(user_name(sess->user));
	uniname = kzalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
	if (!uniname) {
		ret = -ENOMEM;
		goto out;
	}

	conv_len = smb_strtoUTF16(uniname, user_name(sess->user), len,
				  sess->conn->local_nls);
	if (conv_len < 0 || conv_len > len) {
		ret = -EINVAL;
		goto out;
	}
	UniStrupr(uniname);

	ret = crypto_shash_update(CRYPTO_HMACMD5(ctx),
				  (char *)uniname,
				  UNICODE_LEN(conv_len));
	if (ret) {
		ksmbd_debug(AUTH, "Could not update with user\n");
		goto out;
	}

	/* Convert domain name or conn name to unicode and uppercase */
	len = strlen(dname);
	domain = kzalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
	if (!domain) {
		ret = -ENOMEM;
		goto out;
	}

	conv_len = smb_strtoUTF16((__le16 *)domain, dname, len,
				  sess->conn->local_nls);
	if (conv_len < 0 || conv_len > len) {
		ret = -EINVAL;
		goto out;
	}

	ret = crypto_shash_update(CRYPTO_HMACMD5(ctx),
				  (char *)domain,
				  UNICODE_LEN(conv_len));
	if (ret) {
		ksmbd_debug(AUTH, "Could not update with domain\n");
		goto out;
	}

	ret = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_hash);
	if (ret)
		ksmbd_debug(AUTH, "Could not generate md5 hash\n");
out:
	kfree(uniname);
	kfree(domain);
	ksmbd_release_crypto_ctx(ctx);
	return ret;
}

/**
 * ksmbd_auth_ntlmv2() - NTLMv2 authentication handler
 * @sess:	session of connection
 * @ntlmv2:		NTLMv2 challenge response
 * @blen:		NTLMv2 blob length
 * @domain_name:	domain name
 *
 * Return:	0 on success, error number on error
 */
int ksmbd_auth_ntlmv2(struct ksmbd_session *sess, struct ntlmv2_resp *ntlmv2,
		      int blen, char *domain_name, char *cryptkey)
{
	char ntlmv2_hash[CIFS_ENCPWD_SIZE];
	char ntlmv2_rsp[CIFS_HMAC_MD5_HASH_SIZE];
	struct ksmbd_crypto_ctx *ctx;
	char *construct = NULL;
	int rc, len;

	ctx = ksmbd_crypto_ctx_find_hmacmd5();
	if (!ctx) {
		ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
		return -ENOMEM;
	}

	rc = calc_ntlmv2_hash(sess, ntlmv2_hash, domain_name);
	if (rc) {
		ksmbd_debug(AUTH, "could not get v2 hash rc %d\n", rc);
		goto out;
	}

	rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
				 ntlmv2_hash,
				 CIFS_HMAC_MD5_HASH_SIZE);
	if (rc) {
		ksmbd_debug(AUTH, "Could not set NTLMV2 Hash as a key\n");
		goto out;
	}

	rc = crypto_shash_init(CRYPTO_HMACMD5(ctx));
	if (rc) {
		ksmbd_debug(AUTH, "Could not init hmacmd5\n");
		goto out;
	}

	len = CIFS_CRYPTO_KEY_SIZE + blen;
	construct = kzalloc(len, GFP_KERNEL);
	if (!construct) {
		rc = -ENOMEM;
		goto out;
	}

	memcpy(construct, cryptkey, CIFS_CRYPTO_KEY_SIZE);
	memcpy(construct + CIFS_CRYPTO_KEY_SIZE, &ntlmv2->blob_signature, blen);

	rc = crypto_shash_update(CRYPTO_HMACMD5(ctx), construct, len);
	if (rc) {
		ksmbd_debug(AUTH, "Could not update with response\n");
		goto out;
	}

	rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_rsp);
	if (rc) {
		ksmbd_debug(AUTH, "Could not generate md5 hash\n");
		goto out;
	}

	rc = ksmbd_gen_sess_key(sess, ntlmv2_hash, ntlmv2_rsp);
	if (rc) {
		ksmbd_debug(AUTH, "Could not generate sess key\n");
		goto out;
	}

	if (memcmp(ntlmv2->ntlmv2_hash, ntlmv2_rsp, CIFS_HMAC_MD5_HASH_SIZE) != 0)
		rc = -EINVAL;
out:
	ksmbd_release_crypto_ctx(ctx);
	kfree(construct);
	return rc;
}

/**
 * ksmbd_decode_ntlmssp_auth_blob() - helper function to construct
 * authenticate blob
 * @authblob:	authenticate blob source pointer
 * @usr:	user details
 * @sess:	session of connection
 *
 * Return:	0 on success, error number on error
 */
int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
				   int blob_len, struct ksmbd_conn *conn,
				   struct ksmbd_session *sess)
{
	char *domain_name;
	unsigned int nt_off, dn_off;
	unsigned short nt_len, dn_len;
	int ret;

	if (blob_len < sizeof(struct authenticate_message)) {
		ksmbd_debug(AUTH, "negotiate blob len %d too small\n",
			    blob_len);
		return -EINVAL;
	}

	if (memcmp(authblob->Signature, "NTLMSSP", 8)) {
		ksmbd_debug(AUTH, "blob signature incorrect %s\n",
			    authblob->Signature);
		return -EINVAL;
	}

	nt_off = le32_to_cpu(authblob->NtChallengeResponse.BufferOffset);
	nt_len = le16_to_cpu(authblob->NtChallengeResponse.Length);
	dn_off = le32_to_cpu(authblob->DomainName.BufferOffset);
	dn_len = le16_to_cpu(authblob->DomainName.Length);

	if (blob_len < (u64)dn_off + dn_len || blob_len < (u64)nt_off + nt_len)
		return -EINVAL;

	/* TODO : use domain name that imported from configuration file */
	domain_name = smb_strndup_from_utf16((const char *)authblob + dn_off,
					     dn_len, true, conn->local_nls);
	if (IS_ERR(domain_name))
		return PTR_ERR(domain_name);

	/* process NTLMv2 authentication */
	ksmbd_debug(AUTH, "decode_ntlmssp_authenticate_blob dname%s\n",
		    domain_name);
	ret = ksmbd_auth_ntlmv2(sess, (struct ntlmv2_resp *)((char *)authblob + nt_off),
				nt_len - CIFS_ENCPWD_SIZE,
				domain_name, conn->ntlmssp.cryptkey);
	kfree(domain_name);
	return ret;
}

/**
 * ksmbd_decode_ntlmssp_neg_blob() - helper function to construct
 * negotiate blob
 * @negblob: negotiate blob source pointer
 * @rsp:     response header pointer to be updated
 * @sess:    session of connection
 *
 */
int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob,
				  int blob_len, struct ksmbd_conn *conn)
{
	if (blob_len < sizeof(struct negotiate_message)) {
		ksmbd_debug(AUTH, "negotiate blob len %d too small\n",
			    blob_len);
		return -EINVAL;
	}

	if (memcmp(negblob->Signature, "NTLMSSP", 8)) {
		ksmbd_debug(AUTH, "blob signature incorrect %s\n",
			    negblob->Signature);
		return -EINVAL;
	}

	conn->ntlmssp.client_flags = le32_to_cpu(negblob->NegotiateFlags);
	return 0;
}

/**
 * ksmbd_build_ntlmssp_challenge_blob() - helper function to construct
 * challenge blob
 * @chgblob: challenge blob source pointer to initialize
 * @rsp:     response header pointer to be updated
 * @sess:    session of connection
 *
 */
unsigned int
ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
				   struct ksmbd_conn *conn)
{
	struct target_info *tinfo;
	wchar_t *name;
	__u8 *target_name;
	unsigned int flags, blob_off, blob_len, type, target_info_len = 0;
	int len, uni_len, conv_len;
	int cflags = conn->ntlmssp.client_flags;

	memcpy(chgblob->Signature, NTLMSSP_SIGNATURE, 8);
	chgblob->MessageType = NtLmChallenge;

	flags = NTLMSSP_NEGOTIATE_UNICODE |
		NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_TARGET_TYPE_SERVER |
		NTLMSSP_NEGOTIATE_TARGET_INFO;

	if (cflags & NTLMSSP_NEGOTIATE_SIGN) {
		flags |= NTLMSSP_NEGOTIATE_SIGN;
		flags |= cflags & (NTLMSSP_NEGOTIATE_128 |
				   NTLMSSP_NEGOTIATE_56);
	}

	if (cflags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
		flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;

	if (cflags & NTLMSSP_REQUEST_TARGET)
		flags |= NTLMSSP_REQUEST_TARGET;

	if (conn->use_spnego &&
	    (cflags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
		flags |= NTLMSSP_NEGOTIATE_EXTENDED_SEC;

	chgblob->NegotiateFlags = cpu_to_le32(flags);
	len = strlen(ksmbd_netbios_name());
	name = kmalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
	if (!name)
		return -ENOMEM;

	conv_len = smb_strtoUTF16((__le16 *)name, ksmbd_netbios_name(), len,
				  conn->local_nls);
	if (conv_len < 0 || conv_len > len) {
		kfree(name);
		return -EINVAL;
	}

	uni_len = UNICODE_LEN(conv_len);

	blob_off = sizeof(struct challenge_message);
	blob_len = blob_off + uni_len;

	chgblob->TargetName.Length = cpu_to_le16(uni_len);
	chgblob->TargetName.MaximumLength = cpu_to_le16(uni_len);
	chgblob->TargetName.BufferOffset = cpu_to_le32(blob_off);

	/* Initialize random conn challenge */
	get_random_bytes(conn->ntlmssp.cryptkey, sizeof(__u64));
	memcpy(chgblob->Challenge, conn->ntlmssp.cryptkey,
	       CIFS_CRYPTO_KEY_SIZE);

	/* Add Target Information to security buffer */
	chgblob->TargetInfoArray.BufferOffset = cpu_to_le32(blob_len);

	target_name = (__u8 *)chgblob + blob_off;
	memcpy(target_name, name, uni_len);
	tinfo = (struct target_info *)(target_name + uni_len);

	chgblob->TargetInfoArray.Length = 0;
	/* Add target info list for NetBIOS/DNS settings */
	for (type = NTLMSSP_AV_NB_COMPUTER_NAME;
	     type <= NTLMSSP_AV_DNS_DOMAIN_NAME; type++) {
		tinfo->Type = cpu_to_le16(type);
		tinfo->Length = cpu_to_le16(uni_len);
		memcpy(tinfo->Content, name, uni_len);
		tinfo = (struct target_info *)((char *)tinfo + 4 + uni_len);
		target_info_len += 4 + uni_len;
	}

	/* Add terminator subblock */
	tinfo->Type = 0;
	tinfo->Length = 0;
	target_info_len += 4;

	chgblob->TargetInfoArray.Length = cpu_to_le16(target_info_len);
	chgblob->TargetInfoArray.MaximumLength = cpu_to_le16(target_info_len);
	blob_len += target_info_len;
	kfree(name);
	ksmbd_debug(AUTH, "NTLMSSP SecurityBufferLength %d\n", blob_len);
	return blob_len;
}

#ifdef CONFIG_SMB_SERVER_KERBEROS5
int ksmbd_krb5_authenticate(struct ksmbd_session *sess, char *in_blob,
			    int in_len, char *out_blob, int *out_len)
{
	struct ksmbd_spnego_authen_response *resp;
	struct ksmbd_user *user = NULL;
	int retval;

	resp = ksmbd_ipc_spnego_authen_request(in_blob, in_len);
	if (!resp) {
		ksmbd_debug(AUTH, "SPNEGO_AUTHEN_REQUEST failure\n");
		return -EINVAL;
	}

	if (!(resp->login_response.status & KSMBD_USER_FLAG_OK)) {
		ksmbd_debug(AUTH, "krb5 authentication failure\n");
		retval = -EPERM;
		goto out;
	}

	if (*out_len <= resp->spnego_blob_len) {
		ksmbd_debug(AUTH, "buf len %d, but blob len %d\n",
			    *out_len, resp->spnego_blob_len);
		retval = -EINVAL;
		goto out;
	}

	if (resp->session_key_len > sizeof(sess->sess_key)) {
		ksmbd_debug(AUTH, "session key is too long\n");
		retval = -EINVAL;
		goto out;
	}

	user = ksmbd_alloc_user(&resp->login_response);
	if (!user) {
		ksmbd_debug(AUTH, "login failure\n");
		retval = -ENOMEM;
		goto out;
	}
	sess->user = user;

	memcpy(sess->sess_key, resp->payload, resp->session_key_len);
	memcpy(out_blob, resp->payload + resp->session_key_len,
	       resp->spnego_blob_len);
	*out_len = resp->spnego_blob_len;
	retval = 0;
out:
	kvfree(resp);
	return retval;
}
#else
int ksmbd_krb5_authenticate(struct ksmbd_session *sess, char *in_blob,
			    int in_len, char *out_blob, int *out_len)
{
	return -EOPNOTSUPP;
}
#endif

/**
 * ksmbd_sign_smb2_pdu() - function to generate packet signing
 * @conn:	connection
 * @key:	signing key
 * @iov:        buffer iov array
 * @n_vec:	number of iovecs
 * @sig:	signature value generated for client request packet
 *
 */
int ksmbd_sign_smb2_pdu(struct ksmbd_conn *conn, char *key, struct kvec *iov,
			int n_vec, char *sig)
{
	struct ksmbd_crypto_ctx *ctx;
	int rc, i;

	ctx = ksmbd_crypto_ctx_find_hmacsha256();
	if (!ctx) {
		ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
		return -ENOMEM;
	}

	rc = crypto_shash_setkey(CRYPTO_HMACSHA256_TFM(ctx),
				 key,
				 SMB2_NTLMV2_SESSKEY_SIZE);
	if (rc)
		goto out;

	rc = crypto_shash_init(CRYPTO_HMACSHA256(ctx));
	if (rc) {
		ksmbd_debug(AUTH, "hmacsha256 init error %d\n", rc);
		goto out;
	}

	for (i = 0; i < n_vec; i++) {
		rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx),
					 iov[i].iov_base,
					 iov[i].iov_len);
		if (rc) {
			ksmbd_debug(AUTH, "hmacsha256 update error %d\n", rc);
			goto out;
		}
	}

	rc = crypto_shash_final(CRYPTO_HMACSHA256(ctx), sig);
	if (rc)
		ksmbd_debug(AUTH, "hmacsha256 generation error %d\n", rc);
out:
	ksmbd_release_crypto_ctx(ctx);
	return rc;
}

/**
 * ksmbd_sign_smb3_pdu() - function to generate packet signing
 * @conn:	connection
 * @key:	signing key
 * @iov:        buffer iov array
 * @n_vec:	number of iovecs
 * @sig:	signature value generated for client request packet
 *
 */
int ksmbd_sign_smb3_pdu(struct ksmbd_conn *conn, char *key, struct kvec *iov,
			int n_vec, char *sig)
{
	struct ksmbd_crypto_ctx *ctx;
	int rc, i;

	ctx = ksmbd_crypto_ctx_find_cmacaes();
	if (!ctx) {
		ksmbd_debug(AUTH, "could not crypto alloc cmac\n");
		return -ENOMEM;
	}

	rc = crypto_shash_setkey(CRYPTO_CMACAES_TFM(ctx),
				 key,
				 SMB2_CMACAES_SIZE);
	if (rc)
		goto out;

	rc = crypto_shash_init(CRYPTO_CMACAES(ctx));
	if (rc) {
		ksmbd_debug(AUTH, "cmaces init error %d\n", rc);
		goto out;
	}

	for (i = 0; i < n_vec; i++) {
		rc = crypto_shash_update(CRYPTO_CMACAES(ctx),
					 iov[i].iov_base,
					 iov[i].iov_len);
		if (rc) {
			ksmbd_debug(AUTH, "cmaces update error %d\n", rc);
			goto out;
		}
	}

	rc = crypto_shash_final(CRYPTO_CMACAES(ctx), sig);
	if (rc)
		ksmbd_debug(AUTH, "cmaces generation error %d\n", rc);
out:
	ksmbd_release_crypto_ctx(ctx);
	return rc;
}

struct derivation {
	struct kvec label;
	struct kvec context;
	bool binding;
};

static int generate_key(struct ksmbd_session *sess, struct kvec label,
			struct kvec context, __u8 *key, unsigned int key_size)
{
	unsigned char zero = 0x0;
	__u8 i[4] = {0, 0, 0, 1};
	__u8 L128[4] = {0, 0, 0, 128};
	__u8 L256[4] = {0, 0, 1, 0};
	int rc;
	unsigned char prfhash[SMB2_HMACSHA256_SIZE];
	unsigned char *hashptr = prfhash;
	struct ksmbd_crypto_ctx *ctx;

	memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
	memset(key, 0x0, key_size);

	ctx = ksmbd_crypto_ctx_find_hmacsha256();
	if (!ctx) {
		ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
		return -ENOMEM;
	}

	rc = crypto_shash_setkey(CRYPTO_HMACSHA256_TFM(ctx),
				 sess->sess_key,
				 SMB2_NTLMV2_SESSKEY_SIZE);
	if (rc)
		goto smb3signkey_ret;

	rc = crypto_shash_init(CRYPTO_HMACSHA256(ctx));
	if (rc) {
		ksmbd_debug(AUTH, "hmacsha256 init error %d\n", rc);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), i, 4);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with n\n");
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx),
				 label.iov_base,
				 label.iov_len);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with label\n");
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), &zero, 1);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with zero\n");
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx),
				 context.iov_base,
				 context.iov_len);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with context\n");
		goto smb3signkey_ret;
	}

	if (sess->conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
	    sess->conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
		rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L256, 4);
	else
		rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L128, 4);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with L\n");
		goto smb3signkey_ret;
	}

	rc = crypto_shash_final(CRYPTO_HMACSHA256(ctx), hashptr);
	if (rc) {
		ksmbd_debug(AUTH, "Could not generate hmacmd5 hash error %d\n",
			    rc);
		goto smb3signkey_ret;
	}

	memcpy(key, hashptr, key_size);

smb3signkey_ret:
	ksmbd_release_crypto_ctx(ctx);
	return rc;
}

static int generate_smb3signingkey(struct ksmbd_session *sess,
				   struct ksmbd_conn *conn,
				   const struct derivation *signing)
{
	int rc;
	struct channel *chann;
	char *key;

	chann = lookup_chann_list(sess, conn);
	if (!chann)
		return 0;

	if (sess->conn->dialect >= SMB30_PROT_ID && signing->binding)
		key = chann->smb3signingkey;
	else
		key = sess->smb3signingkey;

	rc = generate_key(sess, signing->label, signing->context, key,
			  SMB3_SIGN_KEY_SIZE);
	if (rc)
		return rc;

	if (!(sess->conn->dialect >= SMB30_PROT_ID && signing->binding))
		memcpy(chann->smb3signingkey, key, SMB3_SIGN_KEY_SIZE);

	ksmbd_debug(AUTH, "dumping generated AES signing keys\n");
	ksmbd_debug(AUTH, "Session Id    %llu\n", sess->id);
	ksmbd_debug(AUTH, "Session Key   %*ph\n",
		    SMB2_NTLMV2_SESSKEY_SIZE, sess->sess_key);
	ksmbd_debug(AUTH, "Signing Key   %*ph\n",
		    SMB3_SIGN_KEY_SIZE, key);
	return 0;
}

int ksmbd_gen_smb30_signingkey(struct ksmbd_session *sess,
			       struct ksmbd_conn *conn)
{
	struct derivation d;

	d.label.iov_base = "SMB2AESCMAC";
	d.label.iov_len = 12;
	d.context.iov_base = "SmbSign";
	d.context.iov_len = 8;
	d.binding = conn->binding;

	return generate_smb3signingkey(sess, conn, &d);
}

int ksmbd_gen_smb311_signingkey(struct ksmbd_session *sess,
				struct ksmbd_conn *conn)
{
	struct derivation d;

	d.label.iov_base = "SMBSigningKey";
	d.label.iov_len = 14;
	if (conn->binding) {
		struct preauth_session *preauth_sess;

		preauth_sess = ksmbd_preauth_session_lookup(conn, sess->id);
		if (!preauth_sess)
			return -ENOENT;
		d.context.iov_base = preauth_sess->Preauth_HashValue;
	} else {
		d.context.iov_base = sess->Preauth_HashValue;
	}
	d.context.iov_len = 64;
	d.binding = conn->binding;

	return generate_smb3signingkey(sess, conn, &d);
}

struct derivation_twin {
	struct derivation encryption;
	struct derivation decryption;
};

static int generate_smb3encryptionkey(struct ksmbd_session *sess,
				      const struct derivation_twin *ptwin)
{
	int rc;

	rc = generate_key(sess, ptwin->encryption.label,
			  ptwin->encryption.context, sess->smb3encryptionkey,
			  SMB3_ENC_DEC_KEY_SIZE);
	if (rc)
		return rc;

	rc = generate_key(sess, ptwin->decryption.label,
			  ptwin->decryption.context,
			  sess->smb3decryptionkey, SMB3_ENC_DEC_KEY_SIZE);
	if (rc)
		return rc;

	ksmbd_debug(AUTH, "dumping generated AES encryption keys\n");
	ksmbd_debug(AUTH, "Cipher type   %d\n", sess->conn->cipher_type);
	ksmbd_debug(AUTH, "Session Id    %llu\n", sess->id);
	ksmbd_debug(AUTH, "Session Key   %*ph\n",
		    SMB2_NTLMV2_SESSKEY_SIZE, sess->sess_key);
	if (sess->conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
	    sess->conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) {
		ksmbd_debug(AUTH, "ServerIn Key  %*ph\n",
			    SMB3_GCM256_CRYPTKEY_SIZE, sess->smb3encryptionkey);
		ksmbd_debug(AUTH, "ServerOut Key %*ph\n",
			    SMB3_GCM256_CRYPTKEY_SIZE, sess->smb3decryptionkey);
	} else {
		ksmbd_debug(AUTH, "ServerIn Key  %*ph\n",
			    SMB3_GCM128_CRYPTKEY_SIZE, sess->smb3encryptionkey);
		ksmbd_debug(AUTH, "ServerOut Key %*ph\n",
			    SMB3_GCM128_CRYPTKEY_SIZE, sess->smb3decryptionkey);
	}
	return 0;
}

int ksmbd_gen_smb30_encryptionkey(struct ksmbd_session *sess)
{
	struct derivation_twin twin;
	struct derivation *d;

	d = &twin.encryption;
	d->label.iov_base = "SMB2AESCCM";
	d->label.iov_len = 11;
	d->context.iov_base = "ServerOut";
	d->context.iov_len = 10;

	d = &twin.decryption;
	d->label.iov_base = "SMB2AESCCM";
	d->label.iov_len = 11;
	d->context.iov_base = "ServerIn ";
	d->context.iov_len = 10;

	return generate_smb3encryptionkey(sess, &twin);
}

int ksmbd_gen_smb311_encryptionkey(struct ksmbd_session *sess)
{
	struct derivation_twin twin;
	struct derivation *d;

	d = &twin.encryption;
	d->label.iov_base = "SMBS2CCipherKey";
	d->label.iov_len = 16;
	d->context.iov_base = sess->Preauth_HashValue;
	d->context.iov_len = 64;

	d = &twin.decryption;
	d->label.iov_base = "SMBC2SCipherKey";
	d->label.iov_len = 16;
	d->context.iov_base = sess->Preauth_HashValue;
	d->context.iov_len = 64;

	return generate_smb3encryptionkey(sess, &twin);
}

int ksmbd_gen_preauth_integrity_hash(struct ksmbd_conn *conn, char *buf,
				     __u8 *pi_hash)
{
	int rc;
	struct smb2_hdr *rcv_hdr = smb2_get_msg(buf);
	char *all_bytes_msg = (char *)&rcv_hdr->ProtocolId;
	int msg_size = get_rfc1002_len(buf);
	struct ksmbd_crypto_ctx *ctx = NULL;

	if (conn->preauth_info->Preauth_HashId !=
	    SMB2_PREAUTH_INTEGRITY_SHA512)
		return -EINVAL;

	ctx = ksmbd_crypto_ctx_find_sha512();
	if (!ctx) {
		ksmbd_debug(AUTH, "could not alloc sha512\n");
		return -ENOMEM;
	}

	rc = crypto_shash_init(CRYPTO_SHA512(ctx));
	if (rc) {
		ksmbd_debug(AUTH, "could not init shashn");
		goto out;
	}

	rc = crypto_shash_update(CRYPTO_SHA512(ctx), pi_hash, 64);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with n\n");
		goto out;
	}

	rc = crypto_shash_update(CRYPTO_SHA512(ctx), all_bytes_msg, msg_size);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with n\n");
		goto out;
	}

	rc = crypto_shash_final(CRYPTO_SHA512(ctx), pi_hash);
	if (rc) {
		ksmbd_debug(AUTH, "Could not generate hash err : %d\n", rc);
		goto out;
	}
out:
	ksmbd_release_crypto_ctx(ctx);
	return rc;
}

int ksmbd_gen_sd_hash(struct ksmbd_conn *conn, char *sd_buf, int len,
		      __u8 *pi_hash)
{
	int rc;
	struct ksmbd_crypto_ctx *ctx = NULL;

	ctx = ksmbd_crypto_ctx_find_sha256();
	if (!ctx) {
		ksmbd_debug(AUTH, "could not alloc sha256\n");
		return -ENOMEM;
	}

	rc = crypto_shash_init(CRYPTO_SHA256(ctx));
	if (rc) {
		ksmbd_debug(AUTH, "could not init shashn");
		goto out;
	}

	rc = crypto_shash_update(CRYPTO_SHA256(ctx), sd_buf, len);
	if (rc) {
		ksmbd_debug(AUTH, "could not update with n\n");
		goto out;
	}

	rc = crypto_shash_final(CRYPTO_SHA256(ctx), pi_hash);
	if (rc) {
		ksmbd_debug(AUTH, "Could not generate hash err : %d\n", rc);
		goto out;
	}
out:
	ksmbd_release_crypto_ctx(ctx);
	return rc;
}

static int ksmbd_get_encryption_key(struct ksmbd_conn *conn, __u64 ses_id,
				    int enc, u8 *key)
{
	struct ksmbd_session *sess;
	u8 *ses_enc_key;

	sess = ksmbd_session_lookup_all(conn, ses_id);
	if (!sess)
		return -EINVAL;

	ses_enc_key = enc ? sess->smb3encryptionkey :
		sess->smb3decryptionkey;
	memcpy(key, ses_enc_key, SMB3_ENC_DEC_KEY_SIZE);

	return 0;
}

static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
				   unsigned int buflen)
{
	void *addr;

	if (is_vmalloc_addr(buf))
		addr = vmalloc_to_page(buf);
	else
		addr = virt_to_page(buf);
	sg_set_page(sg, addr, buflen, offset_in_page(buf));
}

static struct scatterlist *ksmbd_init_sg(struct kvec *iov, unsigned int nvec,
					 u8 *sign)
{
	struct scatterlist *sg;
	unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
	int i, nr_entries[3] = {0}, total_entries = 0, sg_idx = 0;

	if (!nvec)
		return NULL;

	for (i = 0; i < nvec - 1; i++) {
		unsigned long kaddr = (unsigned long)iov[i + 1].iov_base;

		if (is_vmalloc_addr(iov[i + 1].iov_base)) {
			nr_entries[i] = ((kaddr + iov[i + 1].iov_len +
					PAGE_SIZE - 1) >> PAGE_SHIFT) -
				(kaddr >> PAGE_SHIFT);
		} else {
			nr_entries[i]++;
		}
		total_entries += nr_entries[i];
	}

	/* Add two entries for transform header and signature */
	total_entries += 2;

	sg = kmalloc_array(total_entries, sizeof(struct scatterlist), GFP_KERNEL);
	if (!sg)
		return NULL;

	sg_init_table(sg, total_entries);
	smb2_sg_set_buf(&sg[sg_idx++], iov[0].iov_base + 24, assoc_data_len);
	for (i = 0; i < nvec - 1; i++) {
		void *data = iov[i + 1].iov_base;
		int len = iov[i + 1].iov_len;

		if (is_vmalloc_addr(data)) {
			int j, offset = offset_in_page(data);

			for (j = 0; j < nr_entries[i]; j++) {
				unsigned int bytes = PAGE_SIZE - offset;

				if (!len)
					break;

				if (bytes > len)
					bytes = len;

				sg_set_page(&sg[sg_idx++],
					    vmalloc_to_page(data), bytes,
					    offset_in_page(data));

				data += bytes;
				len -= bytes;
				offset = 0;
			}
		} else {
			sg_set_page(&sg[sg_idx++], virt_to_page(data), len,
				    offset_in_page(data));
		}
	}
	smb2_sg_set_buf(&sg[sg_idx], sign, SMB2_SIGNATURE_SIZE);
	return sg;
}

int ksmbd_crypt_message(struct ksmbd_conn *conn, struct kvec *iov,
			unsigned int nvec, int enc)
{
	struct smb2_transform_hdr *tr_hdr = smb2_get_msg(iov[0].iov_base);
	unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
	int rc;
	struct scatterlist *sg;
	u8 sign[SMB2_SIGNATURE_SIZE] = {};
	u8 key[SMB3_ENC_DEC_KEY_SIZE];
	struct aead_request *req;
	char *iv;
	unsigned int iv_len;
	struct crypto_aead *tfm;
	unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
	struct ksmbd_crypto_ctx *ctx;

	rc = ksmbd_get_encryption_key(conn,
				      le64_to_cpu(tr_hdr->SessionId),
				      enc,
				      key);
	if (rc) {
		pr_err("Could not get %scryption key\n", enc ? "en" : "de");
		return rc;
	}

	if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
	    conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
		ctx = ksmbd_crypto_ctx_find_gcm();
	else
		ctx = ksmbd_crypto_ctx_find_ccm();
	if (!ctx) {
		pr_err("crypto alloc failed\n");
		return -ENOMEM;
	}

	if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
	    conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
		tfm = CRYPTO_GCM(ctx);
	else
		tfm = CRYPTO_CCM(ctx);

	if (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
	    conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
		rc = crypto_aead_setkey(tfm, key, SMB3_GCM256_CRYPTKEY_SIZE);
	else
		rc = crypto_aead_setkey(tfm, key, SMB3_GCM128_CRYPTKEY_SIZE);
	if (rc) {
		pr_err("Failed to set aead key %d\n", rc);
		goto free_ctx;
	}

	rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
	if (rc) {
		pr_err("Failed to set authsize %d\n", rc);
		goto free_ctx;
	}

	req = aead_request_alloc(tfm, GFP_KERNEL);
	if (!req) {
		rc = -ENOMEM;
		goto free_ctx;
	}

	if (!enc) {
		memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
		crypt_len += SMB2_SIGNATURE_SIZE;
	}

	sg = ksmbd_init_sg(iov, nvec, sign);
	if (!sg) {
		pr_err("Failed to init sg\n");
		rc = -ENOMEM;
		goto free_req;
	}

	iv_len = crypto_aead_ivsize(tfm);
	iv = kzalloc(iv_len, GFP_KERNEL);
	if (!iv) {
		rc = -ENOMEM;
		goto free_sg;
	}

	if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
	    conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) {
		memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
	} else {
		iv[0] = 3;
		memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
	}

	aead_request_set_crypt(req, sg, sg, crypt_len, iv);
	aead_request_set_ad(req, assoc_data_len);
	aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);

	if (enc)
		rc = crypto_aead_encrypt(req);
	else
		rc = crypto_aead_decrypt(req);
	if (rc)
		goto free_iv;

	if (enc)
		memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);

free_iv:
	kfree(iv);
free_sg:
	kfree(sg);
free_req:
	kfree(req);
free_ctx:
	ksmbd_release_crypto_ctx(ctx);
	return rc;
}