This source file includes following definitions.
- smb2_crypto_shash_allocate
- smb3_crypto_shash_allocate
- smb311_crypto_shash_allocate
- smb2_find_smb_ses_unlocked
- smb2_find_smb_ses
- smb2_find_smb_sess_tcon_unlocked
- smb2_find_smb_tcon
- smb2_calc_signature
- generate_key
- generate_smb3signingkey
- generate_smb30signingkey
- generate_smb311signingkey
- smb3_calc_signature
- smb2_sign_rqst
- smb2_verify_signature
- smb2_seq_num_into_buf
- smb2_mid_entry_alloc
- smb2_get_mid_entry
- smb2_check_receive
- smb2_setup_request
- smb2_setup_async_request
- smb3_crypto_aead_allocate
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25 #include <linux/fs.h>
26 #include <linux/list.h>
27 #include <linux/wait.h>
28 #include <linux/net.h>
29 #include <linux/delay.h>
30 #include <linux/uaccess.h>
31 #include <asm/processor.h>
32 #include <linux/mempool.h>
33 #include <linux/highmem.h>
34 #include <crypto/aead.h>
35 #include "smb2pdu.h"
36 #include "cifsglob.h"
37 #include "cifsproto.h"
38 #include "smb2proto.h"
39 #include "cifs_debug.h"
40 #include "smb2status.h"
41 #include "smb2glob.h"
42
43 static int
44 smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
45 {
46 return cifs_alloc_hash("hmac(sha256)",
47 &server->secmech.hmacsha256,
48 &server->secmech.sdeschmacsha256);
49 }
50
51 static int
52 smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
53 {
54 struct cifs_secmech *p = &server->secmech;
55 int rc;
56
57 rc = cifs_alloc_hash("hmac(sha256)",
58 &p->hmacsha256,
59 &p->sdeschmacsha256);
60 if (rc)
61 goto err;
62
63 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
64 if (rc)
65 goto err;
66
67 return 0;
68 err:
69 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
70 return rc;
71 }
72
73 int
74 smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
75 {
76 struct cifs_secmech *p = &server->secmech;
77 int rc = 0;
78
79 rc = cifs_alloc_hash("hmac(sha256)",
80 &p->hmacsha256,
81 &p->sdeschmacsha256);
82 if (rc)
83 return rc;
84
85 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
86 if (rc)
87 goto err;
88
89 rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
90 if (rc)
91 goto err;
92
93 return 0;
94
95 err:
96 cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
97 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
98 return rc;
99 }
100
101 static struct cifs_ses *
102 smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
103 {
104 struct cifs_ses *ses;
105
106 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
107 if (ses->Suid != ses_id)
108 continue;
109 return ses;
110 }
111
112 return NULL;
113 }
114
115 struct cifs_ses *
116 smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
117 {
118 struct cifs_ses *ses;
119
120 spin_lock(&cifs_tcp_ses_lock);
121 ses = smb2_find_smb_ses_unlocked(server, ses_id);
122 spin_unlock(&cifs_tcp_ses_lock);
123
124 return ses;
125 }
126
127 static struct cifs_tcon *
128 smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid)
129 {
130 struct cifs_tcon *tcon;
131
132 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
133 if (tcon->tid != tid)
134 continue;
135 ++tcon->tc_count;
136 return tcon;
137 }
138
139 return NULL;
140 }
141
142
143
144
145
146
147 struct cifs_tcon *
148 smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid)
149 {
150 struct cifs_ses *ses;
151 struct cifs_tcon *tcon;
152
153 spin_lock(&cifs_tcp_ses_lock);
154 ses = smb2_find_smb_ses_unlocked(server, ses_id);
155 if (!ses) {
156 spin_unlock(&cifs_tcp_ses_lock);
157 return NULL;
158 }
159 tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
160 spin_unlock(&cifs_tcp_ses_lock);
161
162 return tcon;
163 }
164
165 int
166 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
167 {
168 int rc;
169 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
170 unsigned char *sigptr = smb2_signature;
171 struct kvec *iov = rqst->rq_iov;
172 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[0].iov_base;
173 struct cifs_ses *ses;
174 struct shash_desc *shash;
175 struct smb_rqst drqst;
176
177 ses = smb2_find_smb_ses(server, shdr->SessionId);
178 if (!ses) {
179 cifs_server_dbg(VFS, "%s: Could not find session\n", __func__);
180 return 0;
181 }
182
183 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
184 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
185
186 rc = smb2_crypto_shash_allocate(server);
187 if (rc) {
188 cifs_server_dbg(VFS, "%s: sha256 alloc failed\n", __func__);
189 return rc;
190 }
191
192 rc = crypto_shash_setkey(server->secmech.hmacsha256,
193 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
194 if (rc) {
195 cifs_server_dbg(VFS, "%s: Could not update with response\n", __func__);
196 return rc;
197 }
198
199 shash = &server->secmech.sdeschmacsha256->shash;
200 rc = crypto_shash_init(shash);
201 if (rc) {
202 cifs_server_dbg(VFS, "%s: Could not init sha256", __func__);
203 return rc;
204 }
205
206
207
208
209
210
211
212
213 drqst = *rqst;
214 if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
215 rc = crypto_shash_update(shash, iov[0].iov_base,
216 iov[0].iov_len);
217 if (rc) {
218 cifs_server_dbg(VFS, "%s: Could not update with payload\n",
219 __func__);
220 return rc;
221 }
222 drqst.rq_iov++;
223 drqst.rq_nvec--;
224 }
225
226 rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
227 if (!rc)
228 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
229
230 return rc;
231 }
232
233 static int generate_key(struct cifs_ses *ses, struct kvec label,
234 struct kvec context, __u8 *key, unsigned int key_size)
235 {
236 unsigned char zero = 0x0;
237 __u8 i[4] = {0, 0, 0, 1};
238 __u8 L[4] = {0, 0, 0, 128};
239 int rc = 0;
240 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
241 unsigned char *hashptr = prfhash;
242 struct TCP_Server_Info *server = ses->server;
243
244 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
245 memset(key, 0x0, key_size);
246
247 rc = smb3_crypto_shash_allocate(server);
248 if (rc) {
249 cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
250 goto smb3signkey_ret;
251 }
252
253 rc = crypto_shash_setkey(server->secmech.hmacsha256,
254 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
255 if (rc) {
256 cifs_server_dbg(VFS, "%s: Could not set with session key\n", __func__);
257 goto smb3signkey_ret;
258 }
259
260 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
261 if (rc) {
262 cifs_server_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
263 goto smb3signkey_ret;
264 }
265
266 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
267 i, 4);
268 if (rc) {
269 cifs_server_dbg(VFS, "%s: Could not update with n\n", __func__);
270 goto smb3signkey_ret;
271 }
272
273 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
274 label.iov_base, label.iov_len);
275 if (rc) {
276 cifs_server_dbg(VFS, "%s: Could not update with label\n", __func__);
277 goto smb3signkey_ret;
278 }
279
280 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
281 &zero, 1);
282 if (rc) {
283 cifs_server_dbg(VFS, "%s: Could not update with zero\n", __func__);
284 goto smb3signkey_ret;
285 }
286
287 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
288 context.iov_base, context.iov_len);
289 if (rc) {
290 cifs_server_dbg(VFS, "%s: Could not update with context\n", __func__);
291 goto smb3signkey_ret;
292 }
293
294 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
295 L, 4);
296 if (rc) {
297 cifs_server_dbg(VFS, "%s: Could not update with L\n", __func__);
298 goto smb3signkey_ret;
299 }
300
301 rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
302 hashptr);
303 if (rc) {
304 cifs_server_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
305 goto smb3signkey_ret;
306 }
307
308 memcpy(key, hashptr, key_size);
309
310 smb3signkey_ret:
311 return rc;
312 }
313
314 struct derivation {
315 struct kvec label;
316 struct kvec context;
317 };
318
319 struct derivation_triplet {
320 struct derivation signing;
321 struct derivation encryption;
322 struct derivation decryption;
323 };
324
325 static int
326 generate_smb3signingkey(struct cifs_ses *ses,
327 const struct derivation_triplet *ptriplet)
328 {
329 int rc;
330
331 rc = generate_key(ses, ptriplet->signing.label,
332 ptriplet->signing.context, ses->smb3signingkey,
333 SMB3_SIGN_KEY_SIZE);
334 if (rc)
335 return rc;
336
337 rc = generate_key(ses, ptriplet->encryption.label,
338 ptriplet->encryption.context, ses->smb3encryptionkey,
339 SMB3_SIGN_KEY_SIZE);
340 if (rc)
341 return rc;
342
343 rc = generate_key(ses, ptriplet->decryption.label,
344 ptriplet->decryption.context,
345 ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
346
347 if (rc)
348 return rc;
349
350 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
351 cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
352
353
354
355
356 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
357 &ses->Suid);
358 cifs_dbg(VFS, "Session Key %*ph\n",
359 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
360 cifs_dbg(VFS, "Signing Key %*ph\n",
361 SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
362 cifs_dbg(VFS, "ServerIn Key %*ph\n",
363 SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey);
364 cifs_dbg(VFS, "ServerOut Key %*ph\n",
365 SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey);
366 #endif
367 return rc;
368 }
369
370 int
371 generate_smb30signingkey(struct cifs_ses *ses)
372
373 {
374 struct derivation_triplet triplet;
375 struct derivation *d;
376
377 d = &triplet.signing;
378 d->label.iov_base = "SMB2AESCMAC";
379 d->label.iov_len = 12;
380 d->context.iov_base = "SmbSign";
381 d->context.iov_len = 8;
382
383 d = &triplet.encryption;
384 d->label.iov_base = "SMB2AESCCM";
385 d->label.iov_len = 11;
386 d->context.iov_base = "ServerIn ";
387 d->context.iov_len = 10;
388
389 d = &triplet.decryption;
390 d->label.iov_base = "SMB2AESCCM";
391 d->label.iov_len = 11;
392 d->context.iov_base = "ServerOut";
393 d->context.iov_len = 10;
394
395 return generate_smb3signingkey(ses, &triplet);
396 }
397
398 int
399 generate_smb311signingkey(struct cifs_ses *ses)
400
401 {
402 struct derivation_triplet triplet;
403 struct derivation *d;
404
405 d = &triplet.signing;
406 d->label.iov_base = "SMBSigningKey";
407 d->label.iov_len = 14;
408 d->context.iov_base = ses->preauth_sha_hash;
409 d->context.iov_len = 64;
410
411 d = &triplet.encryption;
412 d->label.iov_base = "SMBC2SCipherKey";
413 d->label.iov_len = 16;
414 d->context.iov_base = ses->preauth_sha_hash;
415 d->context.iov_len = 64;
416
417 d = &triplet.decryption;
418 d->label.iov_base = "SMBS2CCipherKey";
419 d->label.iov_len = 16;
420 d->context.iov_base = ses->preauth_sha_hash;
421 d->context.iov_len = 64;
422
423 return generate_smb3signingkey(ses, &triplet);
424 }
425
426 int
427 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
428 {
429 int rc;
430 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
431 unsigned char *sigptr = smb3_signature;
432 struct kvec *iov = rqst->rq_iov;
433 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[0].iov_base;
434 struct cifs_ses *ses;
435 struct shash_desc *shash = &server->secmech.sdesccmacaes->shash;
436 struct smb_rqst drqst;
437
438 ses = smb2_find_smb_ses(server, shdr->SessionId);
439 if (!ses) {
440 cifs_server_dbg(VFS, "%s: Could not find session\n", __func__);
441 return 0;
442 }
443
444 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
445 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
446
447 rc = crypto_shash_setkey(server->secmech.cmacaes,
448 ses->smb3signingkey, SMB2_CMACAES_SIZE);
449 if (rc) {
450 cifs_server_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
451 return rc;
452 }
453
454
455
456
457
458
459 rc = crypto_shash_init(shash);
460 if (rc) {
461 cifs_server_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
462 return rc;
463 }
464
465
466
467
468
469
470
471
472 drqst = *rqst;
473 if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
474 rc = crypto_shash_update(shash, iov[0].iov_base,
475 iov[0].iov_len);
476 if (rc) {
477 cifs_server_dbg(VFS, "%s: Could not update with payload\n",
478 __func__);
479 return rc;
480 }
481 drqst.rq_iov++;
482 drqst.rq_nvec--;
483 }
484
485 rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
486 if (!rc)
487 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
488
489 return rc;
490 }
491
492
493 static int
494 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
495 {
496 int rc = 0;
497 struct smb2_sync_hdr *shdr =
498 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
499
500 if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
501 server->tcpStatus == CifsNeedNegotiate)
502 return rc;
503
504 if (!server->session_estab) {
505 strncpy(shdr->Signature, "BSRSPYL", 8);
506 return rc;
507 }
508
509 rc = server->ops->calc_signature(rqst, server);
510
511 return rc;
512 }
513
514 int
515 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
516 {
517 unsigned int rc;
518 char server_response_sig[16];
519 struct smb2_sync_hdr *shdr =
520 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
521
522 if ((shdr->Command == SMB2_NEGOTIATE) ||
523 (shdr->Command == SMB2_SESSION_SETUP) ||
524 (shdr->Command == SMB2_OPLOCK_BREAK) ||
525 server->ignore_signature ||
526 (!server->session_estab))
527 return 0;
528
529
530
531
532
533
534
535 if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
536 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
537 shdr->Command);
538
539
540
541
542
543 memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
544
545 memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
546
547 mutex_lock(&server->srv_mutex);
548 rc = server->ops->calc_signature(rqst, server);
549 mutex_unlock(&server->srv_mutex);
550
551 if (rc)
552 return rc;
553
554 if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
555 return -EACCES;
556 else
557 return 0;
558 }
559
560
561
562
563
564 static inline void
565 smb2_seq_num_into_buf(struct TCP_Server_Info *server,
566 struct smb2_sync_hdr *shdr)
567 {
568 unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
569
570 shdr->MessageId = get_next_mid64(server);
571
572 for (i = 1; i < num; i++)
573 get_next_mid(server);
574 }
575
576 static struct mid_q_entry *
577 smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr,
578 struct TCP_Server_Info *server)
579 {
580 struct mid_q_entry *temp;
581 unsigned int credits = le16_to_cpu(shdr->CreditCharge);
582
583 if (server == NULL) {
584 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
585 return NULL;
586 }
587
588 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
589 memset(temp, 0, sizeof(struct mid_q_entry));
590 kref_init(&temp->refcount);
591 temp->mid = le64_to_cpu(shdr->MessageId);
592 temp->credits = credits > 0 ? credits : 1;
593 temp->pid = current->pid;
594 temp->command = shdr->Command;
595 temp->when_alloc = jiffies;
596 temp->server = server;
597
598
599
600
601
602 get_task_struct(current);
603 temp->creator = current;
604 temp->callback = cifs_wake_up_task;
605 temp->callback_data = current;
606
607 atomic_inc(&midCount);
608 temp->mid_state = MID_REQUEST_ALLOCATED;
609 trace_smb3_cmd_enter(shdr->TreeId, shdr->SessionId,
610 le16_to_cpu(shdr->Command), temp->mid);
611 return temp;
612 }
613
614 static int
615 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
616 struct mid_q_entry **mid)
617 {
618 if (ses->server->tcpStatus == CifsExiting)
619 return -ENOENT;
620
621 if (ses->server->tcpStatus == CifsNeedReconnect) {
622 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
623 return -EAGAIN;
624 }
625
626 if (ses->server->tcpStatus == CifsNeedNegotiate &&
627 shdr->Command != SMB2_NEGOTIATE)
628 return -EAGAIN;
629
630 if (ses->status == CifsNew) {
631 if ((shdr->Command != SMB2_SESSION_SETUP) &&
632 (shdr->Command != SMB2_NEGOTIATE))
633 return -EAGAIN;
634
635 }
636
637 if (ses->status == CifsExiting) {
638 if (shdr->Command != SMB2_LOGOFF)
639 return -EAGAIN;
640
641 }
642
643 *mid = smb2_mid_entry_alloc(shdr, ses->server);
644 if (*mid == NULL)
645 return -ENOMEM;
646 spin_lock(&GlobalMid_Lock);
647 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
648 spin_unlock(&GlobalMid_Lock);
649
650 return 0;
651 }
652
653 int
654 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
655 bool log_error)
656 {
657 unsigned int len = mid->resp_buf_size;
658 struct kvec iov[1];
659 struct smb_rqst rqst = { .rq_iov = iov,
660 .rq_nvec = 1 };
661
662 iov[0].iov_base = (char *)mid->resp_buf;
663 iov[0].iov_len = len;
664
665 dump_smb(mid->resp_buf, min_t(u32, 80, len));
666
667 if (len > 24 && server->sign && !mid->decrypted) {
668 int rc;
669
670 rc = smb2_verify_signature(&rqst, server);
671 if (rc)
672 cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n",
673 rc);
674 }
675
676 return map_smb2_to_linux_error(mid->resp_buf, log_error);
677 }
678
679 struct mid_q_entry *
680 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
681 {
682 int rc;
683 struct smb2_sync_hdr *shdr =
684 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
685 struct mid_q_entry *mid;
686
687 smb2_seq_num_into_buf(ses->server, shdr);
688
689 rc = smb2_get_mid_entry(ses, shdr, &mid);
690 if (rc) {
691 revert_current_mid_from_hdr(ses->server, shdr);
692 return ERR_PTR(rc);
693 }
694
695 rc = smb2_sign_rqst(rqst, ses->server);
696 if (rc) {
697 revert_current_mid_from_hdr(ses->server, shdr);
698 cifs_delete_mid(mid);
699 return ERR_PTR(rc);
700 }
701
702 return mid;
703 }
704
705 struct mid_q_entry *
706 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
707 {
708 int rc;
709 struct smb2_sync_hdr *shdr =
710 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
711 struct mid_q_entry *mid;
712
713 if (server->tcpStatus == CifsNeedNegotiate &&
714 shdr->Command != SMB2_NEGOTIATE)
715 return ERR_PTR(-EAGAIN);
716
717 smb2_seq_num_into_buf(server, shdr);
718
719 mid = smb2_mid_entry_alloc(shdr, server);
720 if (mid == NULL) {
721 revert_current_mid_from_hdr(server, shdr);
722 return ERR_PTR(-ENOMEM);
723 }
724
725 rc = smb2_sign_rqst(rqst, server);
726 if (rc) {
727 revert_current_mid_from_hdr(server, shdr);
728 DeleteMidQEntry(mid);
729 return ERR_PTR(rc);
730 }
731
732 return mid;
733 }
734
735 int
736 smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
737 {
738 struct crypto_aead *tfm;
739
740 if (!server->secmech.ccmaesencrypt) {
741 if (server->cipher_type == SMB2_ENCRYPTION_AES128_GCM)
742 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
743 else
744 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
745 if (IS_ERR(tfm)) {
746 cifs_server_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
747 __func__);
748 return PTR_ERR(tfm);
749 }
750 server->secmech.ccmaesencrypt = tfm;
751 }
752
753 if (!server->secmech.ccmaesdecrypt) {
754 if (server->cipher_type == SMB2_ENCRYPTION_AES128_GCM)
755 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
756 else
757 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
758 if (IS_ERR(tfm)) {
759 crypto_free_aead(server->secmech.ccmaesencrypt);
760 server->secmech.ccmaesencrypt = NULL;
761 cifs_server_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
762 __func__);
763 return PTR_ERR(tfm);
764 }
765 server->secmech.ccmaesdecrypt = tfm;
766 }
767
768 return 0;
769 }