summaryrefslogtreecommitdiffstats
path: root/fs/cifs/cifsencrypt.c
blob: 0912d8bbbac14aa5419b6d7c91f4272ba258a09e (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
// SPDX-License-Identifier: LGPL-2.1
/*
 *
 *   Encryption and hashing operations relating to NTLM, NTLMv2.  See MS-NLMP
 *   for more detailed information
 *
 *   Copyright (C) International Business Machines  Corp., 2005,2013
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 */

#include <linux/fs.h>
#include <linux/slab.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifs_unicode.h"
#include "cifsproto.h"
#include "ntlmssp.h"
#include <linux/ctype.h>
#include <linux/random.h>
#include <linux/highmem.h>
#include <linux/fips.h>
#include "../smbfs_common/arc4.h"
#include <crypto/aead.h>

int __cifs_calc_signature(struct smb_rqst *rqst,
			struct TCP_Server_Info *server, char *signature,
			struct shash_desc *shash)
{
	int i;
	int rc;
	struct kvec *iov = rqst->rq_iov;
	int n_vec = rqst->rq_nvec;
	int is_smb2 = server->vals->header_preamble_size == 0;

	/* iov[0] is actual data and not the rfc1002 length for SMB2+ */
	if (is_smb2) {
		if (iov[0].iov_len <= 4)
			return -EIO;
		i = 0;
	} else {
		if (n_vec < 2 || iov[0].iov_len != 4)
			return -EIO;
		i = 1; /* skip rfc1002 length */
	}

	for (; i < n_vec; i++) {
		if (iov[i].iov_len == 0)
			continue;
		if (iov[i].iov_base == NULL) {
			cifs_dbg(VFS, "null iovec entry\n");
			return -EIO;
		}

		rc = crypto_shash_update(shash,
					 iov[i].iov_base, iov[i].iov_len);
		if (rc) {
			cifs_dbg(VFS, "%s: Could not update with payload\n",
				 __func__);
			return rc;
		}
	}

	/* now hash over the rq_pages array */
	for (i = 0; i < rqst->rq_npages; i++) {
		void *kaddr;
		unsigned int len, offset;

		rqst_page_get_length(rqst, i, &len, &offset);

		kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;

		rc = crypto_shash_update(shash, kaddr, len);
		if (rc) {
			cifs_dbg(VFS, "%s: Could not update with payload\n",
				 __func__);
			kunmap(rqst->rq_pages[i]);
			return rc;
		}

		kunmap(rqst->rq_pages[i]);
	}

	rc = crypto_shash_final(shash, signature);
	if (rc)
		cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);

	return rc;
}

/*
 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
 * The 16 byte signature must be allocated by the caller. Note we only use the
 * 1st eight bytes and that the smb header signature field on input contains
 * the sequence number before this function is called. Also, this function
 * should be called with the server->srv_mutex held.
 */
static int cifs_calc_signature(struct smb_rqst *rqst,
			struct TCP_Server_Info *server, char *signature)
{
	int rc;

	if (!rqst->rq_iov || !signature || !server)
		return -EINVAL;

	rc = cifs_alloc_hash("md5", &server->secmech.md5,
			     &server->secmech.sdescmd5);
	if (rc)
		return -1;

	rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
		return rc;
	}

	rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
		server->session_key.response, server->session_key.len);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
		return rc;
	}

	return __cifs_calc_signature(rqst, server, signature,
				     &server->secmech.sdescmd5->shash);
}

/* must be called with server->srv_mutex held */
int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
		   __u32 *pexpected_response_sequence_number)
{
	int rc = 0;
	char smb_signature[20];
	struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;

	if (rqst->rq_iov[0].iov_len != 4 ||
	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
		return -EIO;

	if ((cifs_pdu == NULL) || (server == NULL))
		return -EINVAL;

	spin_lock(&cifs_tcp_ses_lock);
	if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
	    server->tcpStatus == CifsNeedNegotiate) {
		spin_unlock(&cifs_tcp_ses_lock);
		return rc;
	}
	spin_unlock(&cifs_tcp_ses_lock);

	if (!server->session_estab) {
		memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
		return rc;
	}

	cifs_pdu->Signature.Sequence.SequenceNumber =
				cpu_to_le32(server->sequence_number);
	cifs_pdu->Signature.Sequence.Reserved = 0;

	*pexpected_response_sequence_number = ++server->sequence_number;
	++server->sequence_number;

	rc = cifs_calc_signature(rqst, server, smb_signature);
	if (rc)
		memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	else
		memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);

	return rc;
}

int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
		   __u32 *pexpected_response_sequence)
{
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = n_vec };

	return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
}

/* must be called with server->srv_mutex held */
int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
		  __u32 *pexpected_response_sequence_number)
{
	struct kvec iov[2];

	iov[0].iov_base = cifs_pdu;
	iov[0].iov_len = 4;
	iov[1].iov_base = (char *)cifs_pdu + 4;
	iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);

	return cifs_sign_smbv(iov, 2, server,
			      pexpected_response_sequence_number);
}

int cifs_verify_signature(struct smb_rqst *rqst,
			  struct TCP_Server_Info *server,
			  __u32 expected_sequence_number)
{
	unsigned int rc;
	char server_response_sig[8];
	char what_we_think_sig_should_be[20];
	struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;

	if (rqst->rq_iov[0].iov_len != 4 ||
	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
		return -EIO;

	if (cifs_pdu == NULL || server == NULL)
		return -EINVAL;

	if (!server->session_estab)
		return 0;

	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
		struct smb_com_lock_req *pSMB =
			(struct smb_com_lock_req *)cifs_pdu;
		if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
			return 0;
	}

	/* BB what if signatures are supposed to be on for session but
	   server does not send one? BB */

	/* Do not need to verify session setups with signature "BSRSPYL "  */
	if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
		cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
			 cifs_pdu->Command);

	/* save off the origiginal signature so we can modify the smb and check
		its signature against what the server sent */
	memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);

	cifs_pdu->Signature.Sequence.SequenceNumber =
					cpu_to_le32(expected_sequence_number);
	cifs_pdu->Signature.Sequence.Reserved = 0;

	mutex_lock(&server->srv_mutex);
	rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
	mutex_unlock(&server->srv_mutex);

	if (rc)
		return rc;

/*	cifs_dump_mem("what we think it should be: ",
		      what_we_think_sig_should_be, 16); */

	if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
		return -EACCES;
	else
		return 0;

}

/* Build a proper attribute value/target info pairs blob.
 * Fill in netbios and dns domain name and workstation name
 * and client time (total five av pairs and + one end of fields indicator.
 * Allocate domain name which gets freed when session struct is deallocated.
 */
static int
build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
	unsigned int dlen;
	unsigned int size = 2 * sizeof(struct ntlmssp2_name);
	char *defdmname = "WORKGROUP";
	unsigned char *blobptr;
	struct ntlmssp2_name *attrptr;

	if (!ses->domainName) {
		ses->domainName = kstrdup(defdmname, GFP_KERNEL);
		if (!ses->domainName)
			return -ENOMEM;
	}

	dlen = strlen(ses->domainName);

	/*
	 * The length of this blob is two times the size of a
	 * structure (av pair) which holds name/size
	 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
	 * unicode length of a netbios domain name
	 */
	ses->auth_key.len = size + 2 * dlen;
	ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
	if (!ses->auth_key.response) {
		ses->auth_key.len = 0;
		return -ENOMEM;
	}

	blobptr = ses->auth_key.response;
	attrptr = (struct ntlmssp2_name *) blobptr;

	/*
	 * As defined in MS-NTLM 3.3.2, just this av pair field
	 * is sufficient as part of the temp
	 */
	attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
	attrptr->length = cpu_to_le16(2 * dlen);
	blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
	cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);

	return 0;
}

/* Server has provided av pairs/target info in the type 2 challenge
 * packet and we have plucked it and stored within smb session.
 * We parse that blob here to find netbios domain name to be used
 * as part of ntlmv2 authentication (in Target String), if not already
 * specified on the command line.
 * If this function returns without any error but without fetching
 * domain name, authentication may fail against some server but
 * may not fail against other (those who are not very particular
 * about target string i.e. for some, just user name might suffice.
 */
static int
find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
	unsigned int attrsize;
	unsigned int type;
	unsigned int onesize = sizeof(struct ntlmssp2_name);
	unsigned char *blobptr;
	unsigned char *blobend;
	struct ntlmssp2_name *attrptr;

	if (!ses->auth_key.len || !ses->auth_key.response)
		return 0;

	blobptr = ses->auth_key.response;
	blobend = blobptr + ses->auth_key.len;

	while (blobptr + onesize < blobend) {
		attrptr = (struct ntlmssp2_name *) blobptr;
		type = le16_to_cpu(attrptr->type);
		if (type == NTLMSSP_AV_EOL)
			break;
		blobptr += 2; /* advance attr type */
		attrsize = le16_to_cpu(attrptr->length);
		blobptr += 2; /* advance attr size */
		if (blobptr + attrsize > blobend)
			break;
		if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
			if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
				break;
			if (!ses->domainName) {
				ses->domainName =
					kmalloc(attrsize + 1, GFP_KERNEL);
				if (!ses->domainName)
						return -ENOMEM;
				cifs_from_utf16(ses->domainName,
					(__le16 *)blobptr, attrsize, attrsize,
					nls_cp, NO_MAP_UNI_RSVD);
				break;
			}
		}
		blobptr += attrsize; /* advance attr  value */
	}

	return 0;
}

/* Server has provided av pairs/target info in the type 2 challenge
 * packet and we have plucked it and stored within smb session.
 * We parse that blob here to find the server given timestamp
 * as part of ntlmv2 authentication (or local current time as
 * default in case of failure)
 */
static __le64
find_timestamp(struct cifs_ses *ses)
{
	unsigned int attrsize;
	unsigned int type;
	unsigned int onesize = sizeof(struct ntlmssp2_name);
	unsigned char *blobptr;
	unsigned char *blobend;
	struct ntlmssp2_name *attrptr;
	struct timespec64 ts;

	if (!ses->auth_key.len || !ses->auth_key.response)
		return 0;

	blobptr = ses->auth_key.response;
	blobend = blobptr + ses->auth_key.len;

	while (blobptr + onesize < blobend) {
		attrptr = (struct ntlmssp2_name *) blobptr;
		type = le16_to_cpu(attrptr->type);
		if (type == NTLMSSP_AV_EOL)
			break;
		blobptr += 2; /* advance attr type */
		attrsize = le16_to_cpu(attrptr->length);
		blobptr += 2; /* advance attr size */
		if (blobptr + attrsize > blobend)
			break;
		if (type == NTLMSSP_AV_TIMESTAMP) {
			if (attrsize == sizeof(u64))
				return *((__le64 *)blobptr);
		}
		blobptr += attrsize; /* advance attr value */
	}

	ktime_get_real_ts64(&ts);
	return cpu_to_le64(cifs_UnixTimeToNT(ts));
}

static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
			    const struct nls_table *nls_cp)
{
	int rc = 0;
	int len;
	char nt_hash[CIFS_NTHASH_SIZE];
	__le16 *user;
	wchar_t *domain;
	wchar_t *server;

	if (!ses->server->secmech.sdeschmacmd5) {
		cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
		return -1;
	}

	/* calculate md4 hash of password */
	E_md4hash(ses->password, nt_hash, nls_cp);

	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
				CIFS_NTHASH_SIZE);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
		return rc;
	}

	rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
		return rc;
	}

	/* convert ses->user_name to unicode */
	len = ses->user_name ? strlen(ses->user_name) : 0;
	user = kmalloc(2 + (len * 2), GFP_KERNEL);
	if (user == NULL) {
		rc = -ENOMEM;
		return rc;
	}

	if (len) {
		len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
		UniStrupr(user);
	} else {
		memset(user, '\0', 2);
	}

	rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
				(char *)user, 2 * len);
	kfree(user);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
		return rc;
	}

	/* convert ses->domainName to unicode and uppercase */
	if (ses->domainName) {
		len = strlen(ses->domainName);

		domain = kmalloc(2 + (len * 2), GFP_KERNEL);
		if (domain == NULL) {
			rc = -ENOMEM;
			return rc;
		}
		len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
				      nls_cp);
		rc =
		crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
					(char *)domain, 2 * len);
		kfree(domain);
		if (rc) {
			cifs_dbg(VFS, "%s: Could not update with domain\n",
				 __func__);
			return rc;
		}
	} else {
		/* We use ses->ip_addr if no domain name available */
		len = strlen(ses->ip_addr);

		server = kmalloc(2 + (len * 2), GFP_KERNEL);
		if (server == NULL) {
			rc = -ENOMEM;
			return rc;
		}
		len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
					nls_cp);
		rc =
		crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
					(char *)server, 2 * len);
		kfree(server);
		if (rc) {
			cifs_dbg(VFS, "%s: Could not update with server\n",
				 __func__);
			return rc;
		}
	}

	rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
					ntlmv2_hash);
	if (rc)
		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);

	return rc;
}

static int
CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
{
	int rc;
	struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
	    (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
	unsigned int hash_len;

	/* The MD5 hash starts at challenge_key.key */
	hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
		offsetof(struct ntlmv2_resp, challenge.key[0]));

	if (!ses->server->secmech.sdeschmacmd5) {
		cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
		return -1;
	}

	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
				 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
			 __func__);
		return rc;
	}

	rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
		return rc;
	}

	if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
		memcpy(ntlmv2->challenge.key,
		       ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
	else
		memcpy(ntlmv2->challenge.key,
		       ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
	rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
				 ntlmv2->challenge.key, hash_len);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
		return rc;
	}

	/* Note that the MD5 digest over writes anon.challenge_key.key */
	rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
				ntlmv2->ntlmv2_hash);
	if (rc)
		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);

	return rc;
}

int
setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
	int rc;
	int baselen;
	unsigned int tilen;
	struct ntlmv2_resp *ntlmv2;
	char ntlmv2_hash[16];
	unsigned char *tiblob = NULL; /* target info blob */
	__le64 rsp_timestamp;

	if (nls_cp == NULL) {
		cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
		return -EINVAL;
	}

	if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
		if (!ses->domainName) {
			if (ses->domainAuto) {
				rc = find_domain_name(ses, nls_cp);
				if (rc) {
					cifs_dbg(VFS, "error %d finding domain name\n",
						 rc);
					goto setup_ntlmv2_rsp_ret;
				}
			} else {
				ses->domainName = kstrdup("", GFP_KERNEL);
			}
		}
	} else {
		rc = build_avpair_blob(ses, nls_cp);
		if (rc) {
			cifs_dbg(VFS, "error %d building av pair blob\n", rc);
			goto setup_ntlmv2_rsp_ret;
		}
	}

	/* Must be within 5 minutes of the server (or in range +/-2h
	 * in case of Mac OS X), so simply carry over server timestamp
	 * (as Windows 7 does)
	 */
	rsp_timestamp = find_timestamp(ses);

	baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
	tilen = ses->auth_key.len;
	tiblob = ses->auth_key.response;

	ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
	if (!ses->auth_key.response) {
		rc = -ENOMEM;
		ses->auth_key.len = 0;
		goto setup_ntlmv2_rsp_ret;
	}
	ses->auth_key.len += baselen;

	ntlmv2 = (struct ntlmv2_resp *)
			(ses->auth_key.response + CIFS_SESS_KEY_SIZE);
	ntlmv2->blob_signature = cpu_to_le32(0x00000101);
	ntlmv2->reserved = 0;
	ntlmv2->time = rsp_timestamp;

	get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
	ntlmv2->reserved2 = 0;

	memcpy(ses->auth_key.response + baselen, tiblob, tilen);

	mutex_lock(&ses->server->srv_mutex);

	rc = cifs_alloc_hash("hmac(md5)",
			     &ses->server->secmech.hmacmd5,
			     &ses->server->secmech.sdeschmacmd5);
	if (rc) {
		goto unlock;
	}

	/* calculate ntlmv2_hash */
	rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
	if (rc) {
		cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
		goto unlock;
	}

	/* calculate first part of the client response (CR1) */
	rc = CalcNTLMv2_response(ses, ntlmv2_hash);
	if (rc) {
		cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
		goto unlock;
	}

	/* now calculate the session key for NTLMv2 */
	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
		ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
			 __func__);
		goto unlock;
	}

	rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
		goto unlock;
	}

	rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
		ntlmv2->ntlmv2_hash,
		CIFS_HMAC_MD5_HASH_SIZE);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
		goto unlock;
	}

	rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
		ses->auth_key.response);
	if (rc)
		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);

unlock:
	mutex_unlock(&ses->server->srv_mutex);
setup_ntlmv2_rsp_ret:
	kfree(tiblob);

	return rc;
}

int
calc_seckey(struct cifs_ses *ses)
{
	unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
	struct arc4_ctx *ctx_arc4;

	if (fips_enabled)
		return -ENODEV;

	get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);

	ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
	if (!ctx_arc4) {
		cifs_dbg(VFS, "Could not allocate arc4 context\n");
		return -ENOMEM;
	}

	cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
	cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
			CIFS_CPHTXT_SIZE);

	/* make secondary_key/nonce as session key */
	memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
	/* and make len as that of session key only */
	ses->auth_key.len = CIFS_SESS_KEY_SIZE;

	memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
	kfree_sensitive(ctx_arc4);
	return 0;
}

void
cifs_crypto_secmech_release(struct TCP_Server_Info *server)
{
	if (server->secmech.cmacaes) {
		crypto_free_shash(server->secmech.cmacaes);
		server->secmech.cmacaes = NULL;
	}

	if (server->secmech.hmacsha256) {
		crypto_free_shash(server->secmech.hmacsha256);
		server->secmech.hmacsha256 = NULL;
	}

	if (server->secmech.md5) {
		crypto_free_shash(server->secmech.md5);
		server->secmech.md5 = NULL;
	}

	if (server->secmech.sha512) {
		crypto_free_shash(server->secmech.sha512);
		server->secmech.sha512 = NULL;
	}

	if (server->secmech.hmacmd5) {
		crypto_free_shash(server->secmech.hmacmd5);
		server->secmech.hmacmd5 = NULL;
	}

	if (server->secmech.ccmaesencrypt) {
		crypto_free_aead(server->secmech.ccmaesencrypt);
		server->secmech.ccmaesencrypt = NULL;
	}

	if (server->secmech.ccmaesdecrypt) {
		crypto_free_aead(server->secmech.ccmaesdecrypt);
		server->secmech.ccmaesdecrypt = NULL;
	}

	kfree(server->secmech.sdesccmacaes);
	server->secmech.sdesccmacaes = NULL;
	kfree(server->secmech.sdeschmacsha256);
	server->secmech.sdeschmacsha256 = NULL;
	kfree(server->secmech.sdeschmacmd5);
	server->secmech.sdeschmacmd5 = NULL;
	kfree(server->secmech.sdescmd5);
	server->secmech.sdescmd5 = NULL;
	kfree(server->secmech.sdescsha512);
	server->secmech.sdescsha512 = NULL;
}