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1// SPDX-License-Identifier: LGPL-2.1
2/*
3 *
4 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
5 * for more detailed information
6 *
7 * Copyright (C) International Business Machines Corp., 2005,2013
8 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
10 */
11
12#include <linux/fs.h>
13#include <linux/slab.h>
14#include "cifspdu.h"
15#include "cifsglob.h"
16#include "cifs_debug.h"
17#include "cifs_unicode.h"
18#include "cifsproto.h"
19#include "ntlmssp.h"
20#include <linux/ctype.h>
21#include <linux/random.h>
22#include <linux/highmem.h>
23#include <linux/fips.h>
24#include "../smbfs_common/arc4.h"
25#include <crypto/aead.h>
26
27int __cifs_calc_signature(struct smb_rqst *rqst,
28 struct TCP_Server_Info *server, char *signature,
29 struct shash_desc *shash)
30{
31 int i;
32 int rc;
33 struct kvec *iov = rqst->rq_iov;
34 int n_vec = rqst->rq_nvec;
35
36 /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
37 if (!is_smb1(server)) {
38 if (iov[0].iov_len <= 4)
39 return -EIO;
40 i = 0;
41 } else {
42 if (n_vec < 2 || iov[0].iov_len != 4)
43 return -EIO;
44 i = 1; /* skip rfc1002 length */
45 }
46
47 for (; i < n_vec; i++) {
48 if (iov[i].iov_len == 0)
49 continue;
50 if (iov[i].iov_base == NULL) {
51 cifs_dbg(VFS, "null iovec entry\n");
52 return -EIO;
53 }
54
55 rc = crypto_shash_update(shash,
56 iov[i].iov_base, iov[i].iov_len);
57 if (rc) {
58 cifs_dbg(VFS, "%s: Could not update with payload\n",
59 __func__);
60 return rc;
61 }
62 }
63
64 /* now hash over the rq_pages array */
65 for (i = 0; i < rqst->rq_npages; i++) {
66 void *kaddr;
67 unsigned int len, offset;
68
69 rqst_page_get_length(rqst, i, &len, &offset);
70
71 kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
72
73 rc = crypto_shash_update(shash, kaddr, len);
74 if (rc) {
75 cifs_dbg(VFS, "%s: Could not update with payload\n",
76 __func__);
77 kunmap(rqst->rq_pages[i]);
78 return rc;
79 }
80
81 kunmap(rqst->rq_pages[i]);
82 }
83
84 rc = crypto_shash_final(shash, signature);
85 if (rc)
86 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
87
88 return rc;
89}
90
91/*
92 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
93 * The 16 byte signature must be allocated by the caller. Note we only use the
94 * 1st eight bytes and that the smb header signature field on input contains
95 * the sequence number before this function is called. Also, this function
96 * should be called with the server->srv_mutex held.
97 */
98static int cifs_calc_signature(struct smb_rqst *rqst,
99 struct TCP_Server_Info *server, char *signature)
100{
101 int rc;
102
103 if (!rqst->rq_iov || !signature || !server)
104 return -EINVAL;
105
106 rc = cifs_alloc_hash("md5", &server->secmech.md5);
107 if (rc)
108 return -1;
109
110 rc = crypto_shash_init(server->secmech.md5);
111 if (rc) {
112 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
113 return rc;
114 }
115
116 rc = crypto_shash_update(server->secmech.md5,
117 server->session_key.response, server->session_key.len);
118 if (rc) {
119 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
120 return rc;
121 }
122
123 return __cifs_calc_signature(rqst, server, signature, server->secmech.md5);
124}
125
126/* must be called with server->srv_mutex held */
127int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
128 __u32 *pexpected_response_sequence_number)
129{
130 int rc = 0;
131 char smb_signature[20];
132 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
133
134 if (rqst->rq_iov[0].iov_len != 4 ||
135 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
136 return -EIO;
137
138 if ((cifs_pdu == NULL) || (server == NULL))
139 return -EINVAL;
140
141 spin_lock(&server->srv_lock);
142 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
143 server->tcpStatus == CifsNeedNegotiate) {
144 spin_unlock(&server->srv_lock);
145 return rc;
146 }
147 spin_unlock(&server->srv_lock);
148
149 if (!server->session_estab) {
150 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
151 return rc;
152 }
153
154 cifs_pdu->Signature.Sequence.SequenceNumber =
155 cpu_to_le32(server->sequence_number);
156 cifs_pdu->Signature.Sequence.Reserved = 0;
157
158 *pexpected_response_sequence_number = ++server->sequence_number;
159 ++server->sequence_number;
160
161 rc = cifs_calc_signature(rqst, server, smb_signature);
162 if (rc)
163 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
164 else
165 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
166
167 return rc;
168}
169
170int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
171 __u32 *pexpected_response_sequence)
172{
173 struct smb_rqst rqst = { .rq_iov = iov,
174 .rq_nvec = n_vec };
175
176 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
177}
178
179/* must be called with server->srv_mutex held */
180int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
181 __u32 *pexpected_response_sequence_number)
182{
183 struct kvec iov[2];
184
185 iov[0].iov_base = cifs_pdu;
186 iov[0].iov_len = 4;
187 iov[1].iov_base = (char *)cifs_pdu + 4;
188 iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
189
190 return cifs_sign_smbv(iov, 2, server,
191 pexpected_response_sequence_number);
192}
193
194int cifs_verify_signature(struct smb_rqst *rqst,
195 struct TCP_Server_Info *server,
196 __u32 expected_sequence_number)
197{
198 unsigned int rc;
199 char server_response_sig[8];
200 char what_we_think_sig_should_be[20];
201 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
202
203 if (rqst->rq_iov[0].iov_len != 4 ||
204 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
205 return -EIO;
206
207 if (cifs_pdu == NULL || server == NULL)
208 return -EINVAL;
209
210 if (!server->session_estab)
211 return 0;
212
213 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
214 struct smb_com_lock_req *pSMB =
215 (struct smb_com_lock_req *)cifs_pdu;
216 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
217 return 0;
218 }
219
220 /* BB what if signatures are supposed to be on for session but
221 server does not send one? BB */
222
223 /* Do not need to verify session setups with signature "BSRSPYL " */
224 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
225 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
226 cifs_pdu->Command);
227
228 /* save off the origiginal signature so we can modify the smb and check
229 its signature against what the server sent */
230 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
231
232 cifs_pdu->Signature.Sequence.SequenceNumber =
233 cpu_to_le32(expected_sequence_number);
234 cifs_pdu->Signature.Sequence.Reserved = 0;
235
236 cifs_server_lock(server);
237 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
238 cifs_server_unlock(server);
239
240 if (rc)
241 return rc;
242
243/* cifs_dump_mem("what we think it should be: ",
244 what_we_think_sig_should_be, 16); */
245
246 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
247 return -EACCES;
248 else
249 return 0;
250
251}
252
253/* Build a proper attribute value/target info pairs blob.
254 * Fill in netbios and dns domain name and workstation name
255 * and client time (total five av pairs and + one end of fields indicator.
256 * Allocate domain name which gets freed when session struct is deallocated.
257 */
258static int
259build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
260{
261 unsigned int dlen;
262 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
263 char *defdmname = "WORKGROUP";
264 unsigned char *blobptr;
265 struct ntlmssp2_name *attrptr;
266
267 if (!ses->domainName) {
268 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
269 if (!ses->domainName)
270 return -ENOMEM;
271 }
272
273 dlen = strlen(ses->domainName);
274
275 /*
276 * The length of this blob is two times the size of a
277 * structure (av pair) which holds name/size
278 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
279 * unicode length of a netbios domain name
280 */
281 kfree_sensitive(ses->auth_key.response);
282 ses->auth_key.len = size + 2 * dlen;
283 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
284 if (!ses->auth_key.response) {
285 ses->auth_key.len = 0;
286 return -ENOMEM;
287 }
288
289 blobptr = ses->auth_key.response;
290 attrptr = (struct ntlmssp2_name *) blobptr;
291
292 /*
293 * As defined in MS-NTLM 3.3.2, just this av pair field
294 * is sufficient as part of the temp
295 */
296 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
297 attrptr->length = cpu_to_le16(2 * dlen);
298 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
299 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
300
301 return 0;
302}
303
304/* Server has provided av pairs/target info in the type 2 challenge
305 * packet and we have plucked it and stored within smb session.
306 * We parse that blob here to find netbios domain name to be used
307 * as part of ntlmv2 authentication (in Target String), if not already
308 * specified on the command line.
309 * If this function returns without any error but without fetching
310 * domain name, authentication may fail against some server but
311 * may not fail against other (those who are not very particular
312 * about target string i.e. for some, just user name might suffice.
313 */
314static int
315find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
316{
317 unsigned int attrsize;
318 unsigned int type;
319 unsigned int onesize = sizeof(struct ntlmssp2_name);
320 unsigned char *blobptr;
321 unsigned char *blobend;
322 struct ntlmssp2_name *attrptr;
323
324 if (!ses->auth_key.len || !ses->auth_key.response)
325 return 0;
326
327 blobptr = ses->auth_key.response;
328 blobend = blobptr + ses->auth_key.len;
329
330 while (blobptr + onesize < blobend) {
331 attrptr = (struct ntlmssp2_name *) blobptr;
332 type = le16_to_cpu(attrptr->type);
333 if (type == NTLMSSP_AV_EOL)
334 break;
335 blobptr += 2; /* advance attr type */
336 attrsize = le16_to_cpu(attrptr->length);
337 blobptr += 2; /* advance attr size */
338 if (blobptr + attrsize > blobend)
339 break;
340 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
341 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
342 break;
343 if (!ses->domainName) {
344 ses->domainName =
345 kmalloc(attrsize + 1, GFP_KERNEL);
346 if (!ses->domainName)
347 return -ENOMEM;
348 cifs_from_utf16(ses->domainName,
349 (__le16 *)blobptr, attrsize, attrsize,
350 nls_cp, NO_MAP_UNI_RSVD);
351 break;
352 }
353 }
354 blobptr += attrsize; /* advance attr value */
355 }
356
357 return 0;
358}
359
360/* Server has provided av pairs/target info in the type 2 challenge
361 * packet and we have plucked it and stored within smb session.
362 * We parse that blob here to find the server given timestamp
363 * as part of ntlmv2 authentication (or local current time as
364 * default in case of failure)
365 */
366static __le64
367find_timestamp(struct cifs_ses *ses)
368{
369 unsigned int attrsize;
370 unsigned int type;
371 unsigned int onesize = sizeof(struct ntlmssp2_name);
372 unsigned char *blobptr;
373 unsigned char *blobend;
374 struct ntlmssp2_name *attrptr;
375 struct timespec64 ts;
376
377 if (!ses->auth_key.len || !ses->auth_key.response)
378 return 0;
379
380 blobptr = ses->auth_key.response;
381 blobend = blobptr + ses->auth_key.len;
382
383 while (blobptr + onesize < blobend) {
384 attrptr = (struct ntlmssp2_name *) blobptr;
385 type = le16_to_cpu(attrptr->type);
386 if (type == NTLMSSP_AV_EOL)
387 break;
388 blobptr += 2; /* advance attr type */
389 attrsize = le16_to_cpu(attrptr->length);
390 blobptr += 2; /* advance attr size */
391 if (blobptr + attrsize > blobend)
392 break;
393 if (type == NTLMSSP_AV_TIMESTAMP) {
394 if (attrsize == sizeof(u64))
395 return *((__le64 *)blobptr);
396 }
397 blobptr += attrsize; /* advance attr value */
398 }
399
400 ktime_get_real_ts64(&ts);
401 return cpu_to_le64(cifs_UnixTimeToNT(ts));
402}
403
404static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
405 const struct nls_table *nls_cp)
406{
407 int rc = 0;
408 int len;
409 char nt_hash[CIFS_NTHASH_SIZE];
410 __le16 *user;
411 wchar_t *domain;
412 wchar_t *server;
413
414 if (!ses->server->secmech.hmacmd5) {
415 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
416 return -1;
417 }
418
419 /* calculate md4 hash of password */
420 E_md4hash(ses->password, nt_hash, nls_cp);
421
422 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, nt_hash,
423 CIFS_NTHASH_SIZE);
424 if (rc) {
425 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
426 return rc;
427 }
428
429 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
430 if (rc) {
431 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
432 return rc;
433 }
434
435 /* convert ses->user_name to unicode */
436 len = ses->user_name ? strlen(ses->user_name) : 0;
437 user = kmalloc(2 + (len * 2), GFP_KERNEL);
438 if (user == NULL) {
439 rc = -ENOMEM;
440 return rc;
441 }
442
443 if (len) {
444 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
445 UniStrupr(user);
446 } else {
447 memset(user, '\0', 2);
448 }
449
450 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
451 (char *)user, 2 * len);
452 kfree(user);
453 if (rc) {
454 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
455 return rc;
456 }
457
458 /* convert ses->domainName to unicode and uppercase */
459 if (ses->domainName) {
460 len = strlen(ses->domainName);
461
462 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
463 if (domain == NULL) {
464 rc = -ENOMEM;
465 return rc;
466 }
467 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
468 nls_cp);
469 rc =
470 crypto_shash_update(ses->server->secmech.hmacmd5,
471 (char *)domain, 2 * len);
472 kfree(domain);
473 if (rc) {
474 cifs_dbg(VFS, "%s: Could not update with domain\n",
475 __func__);
476 return rc;
477 }
478 } else {
479 /* We use ses->ip_addr if no domain name available */
480 len = strlen(ses->ip_addr);
481
482 server = kmalloc(2 + (len * 2), GFP_KERNEL);
483 if (server == NULL) {
484 rc = -ENOMEM;
485 return rc;
486 }
487 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
488 nls_cp);
489 rc =
490 crypto_shash_update(ses->server->secmech.hmacmd5,
491 (char *)server, 2 * len);
492 kfree(server);
493 if (rc) {
494 cifs_dbg(VFS, "%s: Could not update with server\n",
495 __func__);
496 return rc;
497 }
498 }
499
500 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
501 ntlmv2_hash);
502 if (rc)
503 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
504
505 return rc;
506}
507
508static int
509CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
510{
511 int rc;
512 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
513 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
514 unsigned int hash_len;
515
516 /* The MD5 hash starts at challenge_key.key */
517 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
518 offsetof(struct ntlmv2_resp, challenge.key[0]));
519
520 if (!ses->server->secmech.hmacmd5) {
521 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
522 return -1;
523 }
524
525 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
526 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
527 if (rc) {
528 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
529 __func__);
530 return rc;
531 }
532
533 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
534 if (rc) {
535 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
536 return rc;
537 }
538
539 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
540 memcpy(ntlmv2->challenge.key,
541 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
542 else
543 memcpy(ntlmv2->challenge.key,
544 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
545 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
546 ntlmv2->challenge.key, hash_len);
547 if (rc) {
548 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
549 return rc;
550 }
551
552 /* Note that the MD5 digest over writes anon.challenge_key.key */
553 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
554 ntlmv2->ntlmv2_hash);
555 if (rc)
556 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
557
558 return rc;
559}
560
561int
562setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
563{
564 int rc;
565 int baselen;
566 unsigned int tilen;
567 struct ntlmv2_resp *ntlmv2;
568 char ntlmv2_hash[16];
569 unsigned char *tiblob = NULL; /* target info blob */
570 __le64 rsp_timestamp;
571
572 if (nls_cp == NULL) {
573 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
574 return -EINVAL;
575 }
576
577 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
578 if (!ses->domainName) {
579 if (ses->domainAuto) {
580 rc = find_domain_name(ses, nls_cp);
581 if (rc) {
582 cifs_dbg(VFS, "error %d finding domain name\n",
583 rc);
584 goto setup_ntlmv2_rsp_ret;
585 }
586 } else {
587 ses->domainName = kstrdup("", GFP_KERNEL);
588 }
589 }
590 } else {
591 rc = build_avpair_blob(ses, nls_cp);
592 if (rc) {
593 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
594 goto setup_ntlmv2_rsp_ret;
595 }
596 }
597
598 /* Must be within 5 minutes of the server (or in range +/-2h
599 * in case of Mac OS X), so simply carry over server timestamp
600 * (as Windows 7 does)
601 */
602 rsp_timestamp = find_timestamp(ses);
603
604 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
605 tilen = ses->auth_key.len;
606 tiblob = ses->auth_key.response;
607
608 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
609 if (!ses->auth_key.response) {
610 rc = -ENOMEM;
611 ses->auth_key.len = 0;
612 goto setup_ntlmv2_rsp_ret;
613 }
614 ses->auth_key.len += baselen;
615
616 ntlmv2 = (struct ntlmv2_resp *)
617 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
618 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
619 ntlmv2->reserved = 0;
620 ntlmv2->time = rsp_timestamp;
621
622 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
623 ntlmv2->reserved2 = 0;
624
625 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
626
627 cifs_server_lock(ses->server);
628
629 rc = cifs_alloc_hash("hmac(md5)", &ses->server->secmech.hmacmd5);
630 if (rc) {
631 goto unlock;
632 }
633
634 /* calculate ntlmv2_hash */
635 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
636 if (rc) {
637 cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
638 goto unlock;
639 }
640
641 /* calculate first part of the client response (CR1) */
642 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
643 if (rc) {
644 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
645 goto unlock;
646 }
647
648 /* now calculate the session key for NTLMv2 */
649 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
650 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
651 if (rc) {
652 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
653 __func__);
654 goto unlock;
655 }
656
657 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
658 if (rc) {
659 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
660 goto unlock;
661 }
662
663 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
664 ntlmv2->ntlmv2_hash,
665 CIFS_HMAC_MD5_HASH_SIZE);
666 if (rc) {
667 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
668 goto unlock;
669 }
670
671 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
672 ses->auth_key.response);
673 if (rc)
674 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
675
676unlock:
677 cifs_server_unlock(ses->server);
678setup_ntlmv2_rsp_ret:
679 kfree_sensitive(tiblob);
680
681 return rc;
682}
683
684int
685calc_seckey(struct cifs_ses *ses)
686{
687 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
688 struct arc4_ctx *ctx_arc4;
689
690 if (fips_enabled)
691 return -ENODEV;
692
693 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
694
695 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
696 if (!ctx_arc4) {
697 cifs_dbg(VFS, "Could not allocate arc4 context\n");
698 return -ENOMEM;
699 }
700
701 cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
702 cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
703 CIFS_CPHTXT_SIZE);
704
705 /* make secondary_key/nonce as session key */
706 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
707 /* and make len as that of session key only */
708 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
709
710 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
711 kfree_sensitive(ctx_arc4);
712 return 0;
713}
714
715void
716cifs_crypto_secmech_release(struct TCP_Server_Info *server)
717{
718 cifs_free_hash(&server->secmech.aes_cmac);
719 cifs_free_hash(&server->secmech.hmacsha256);
720 cifs_free_hash(&server->secmech.md5);
721 cifs_free_hash(&server->secmech.sha512);
722 cifs_free_hash(&server->secmech.hmacmd5);
723
724 if (server->secmech.enc) {
725 crypto_free_aead(server->secmech.enc);
726 server->secmech.enc = NULL;
727 }
728
729 if (server->secmech.dec) {
730 crypto_free_aead(server->secmech.dec);
731 server->secmech.dec = NULL;
732 }
733}