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13#include <linux/fs.h>
14#include <linux/list.h>
15#include <linux/wait.h>
16#include <linux/net.h>
17#include <linux/delay.h>
18#include <linux/uaccess.h>
19#include <asm/processor.h>
20#include <linux/mempool.h>
21#include <linux/highmem.h>
22#include <crypto/aead.h>
23#include "smb2pdu.h"
24#include "cifsglob.h"
25#include "cifsproto.h"
26#include "smb2proto.h"
27#include "cifs_debug.h"
28#include "smb2status.h"
29#include "smb2glob.h"
30
31static int
32smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
33{
34 struct cifs_secmech *p = &server->secmech;
35 int rc;
36
37 rc = cifs_alloc_hash("hmac(sha256)",
38 &p->hmacsha256,
39 &p->sdeschmacsha256);
40 if (rc)
41 goto err;
42
43 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
44 if (rc)
45 goto err;
46
47 return 0;
48err:
49 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
50 return rc;
51}
52
53int
54smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
55{
56 struct cifs_secmech *p = &server->secmech;
57 int rc = 0;
58
59 rc = cifs_alloc_hash("hmac(sha256)",
60 &p->hmacsha256,
61 &p->sdeschmacsha256);
62 if (rc)
63 return rc;
64
65 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
66 if (rc)
67 goto err;
68
69 rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
70 if (rc)
71 goto err;
72
73 return 0;
74
75err:
76 cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
77 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
78 return rc;
79}
80
81
82static
83int smb2_get_sign_key(__u64 ses_id, struct TCP_Server_Info *server, u8 *key)
84{
85 struct cifs_chan *chan;
86 struct cifs_ses *ses = NULL;
87 struct TCP_Server_Info *it = NULL;
88 int i;
89 int rc = 0;
90
91 spin_lock(&cifs_tcp_ses_lock);
92
93 list_for_each_entry(it, &cifs_tcp_ses_list, tcp_ses_list) {
94 list_for_each_entry(ses, &it->smb_ses_list, smb_ses_list) {
95 if (ses->Suid == ses_id)
96 goto found;
97 }
98 }
99 cifs_server_dbg(VFS, "%s: Could not find session 0x%llx\n",
100 __func__, ses_id);
101 rc = -ENOENT;
102 goto out;
103
104found:
105 if (ses->binding) {
106
107
108
109
110
111 memcpy(key, ses->smb3signingkey, SMB3_SIGN_KEY_SIZE);
112 goto out;
113 }
114
115
116
117
118
119 for (i = 0; i < ses->chan_count; i++) {
120 chan = ses->chans + i;
121 if (chan->server == server) {
122 memcpy(key, chan->signkey, SMB3_SIGN_KEY_SIZE);
123 goto out;
124 }
125 }
126
127 cifs_dbg(VFS,
128 "%s: Could not find channel signing key for session 0x%llx\n",
129 __func__, ses_id);
130 rc = -ENOENT;
131
132out:
133 spin_unlock(&cifs_tcp_ses_lock);
134 return rc;
135}
136
137static struct cifs_ses *
138smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
139{
140 struct cifs_ses *ses;
141
142 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
143 if (ses->Suid != ses_id)
144 continue;
145 ++ses->ses_count;
146 return ses;
147 }
148
149 return NULL;
150}
151
152struct cifs_ses *
153smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
154{
155 struct cifs_ses *ses;
156
157 spin_lock(&cifs_tcp_ses_lock);
158 ses = smb2_find_smb_ses_unlocked(server, ses_id);
159 spin_unlock(&cifs_tcp_ses_lock);
160
161 return ses;
162}
163
164static struct cifs_tcon *
165smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid)
166{
167 struct cifs_tcon *tcon;
168
169 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
170 if (tcon->tid != tid)
171 continue;
172 ++tcon->tc_count;
173 return tcon;
174 }
175
176 return NULL;
177}
178
179
180
181
182
183
184struct cifs_tcon *
185smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid)
186{
187 struct cifs_ses *ses;
188 struct cifs_tcon *tcon;
189
190 spin_lock(&cifs_tcp_ses_lock);
191 ses = smb2_find_smb_ses_unlocked(server, ses_id);
192 if (!ses) {
193 spin_unlock(&cifs_tcp_ses_lock);
194 return NULL;
195 }
196 tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
197 if (!tcon) {
198 cifs_put_smb_ses(ses);
199 spin_unlock(&cifs_tcp_ses_lock);
200 return NULL;
201 }
202 spin_unlock(&cifs_tcp_ses_lock);
203
204 cifs_put_smb_ses(ses);
205
206 return tcon;
207}
208
209int
210smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
211 bool allocate_crypto)
212{
213 int rc;
214 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
215 unsigned char *sigptr = smb2_signature;
216 struct kvec *iov = rqst->rq_iov;
217 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[0].iov_base;
218 struct cifs_ses *ses;
219 struct shash_desc *shash;
220 struct crypto_shash *hash;
221 struct sdesc *sdesc = NULL;
222 struct smb_rqst drqst;
223
224 ses = smb2_find_smb_ses(server, shdr->SessionId);
225 if (!ses) {
226 cifs_server_dbg(VFS, "%s: Could not find session\n", __func__);
227 return 0;
228 }
229
230 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
231 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
232
233 if (allocate_crypto) {
234 rc = cifs_alloc_hash("hmac(sha256)", &hash, &sdesc);
235 if (rc) {
236 cifs_server_dbg(VFS,
237 "%s: sha256 alloc failed\n", __func__);
238 goto out;
239 }
240 shash = &sdesc->shash;
241 } else {
242 hash = server->secmech.hmacsha256;
243 shash = &server->secmech.sdeschmacsha256->shash;
244 }
245
246 rc = crypto_shash_setkey(hash, ses->auth_key.response,
247 SMB2_NTLMV2_SESSKEY_SIZE);
248 if (rc) {
249 cifs_server_dbg(VFS,
250 "%s: Could not update with response\n",
251 __func__);
252 goto out;
253 }
254
255 rc = crypto_shash_init(shash);
256 if (rc) {
257 cifs_server_dbg(VFS, "%s: Could not init sha256", __func__);
258 goto out;
259 }
260
261
262
263
264
265
266
267
268 drqst = *rqst;
269 if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
270 rc = crypto_shash_update(shash, iov[0].iov_base,
271 iov[0].iov_len);
272 if (rc) {
273 cifs_server_dbg(VFS,
274 "%s: Could not update with payload\n",
275 __func__);
276 goto out;
277 }
278 drqst.rq_iov++;
279 drqst.rq_nvec--;
280 }
281
282 rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
283 if (!rc)
284 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
285
286out:
287 if (allocate_crypto)
288 cifs_free_hash(&hash, &sdesc);
289 if (ses)
290 cifs_put_smb_ses(ses);
291 return rc;
292}
293
294static int generate_key(struct cifs_ses *ses, struct kvec label,
295 struct kvec context, __u8 *key, unsigned int key_size)
296{
297 unsigned char zero = 0x0;
298 __u8 i[4] = {0, 0, 0, 1};
299 __u8 L128[4] = {0, 0, 0, 128};
300 __u8 L256[4] = {0, 0, 1, 0};
301 int rc = 0;
302 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
303 unsigned char *hashptr = prfhash;
304 struct TCP_Server_Info *server = ses->server;
305
306 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
307 memset(key, 0x0, key_size);
308
309 rc = smb3_crypto_shash_allocate(server);
310 if (rc) {
311 cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
312 goto smb3signkey_ret;
313 }
314
315 rc = crypto_shash_setkey(server->secmech.hmacsha256,
316 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
317 if (rc) {
318 cifs_server_dbg(VFS, "%s: Could not set with session key\n", __func__);
319 goto smb3signkey_ret;
320 }
321
322 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
323 if (rc) {
324 cifs_server_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
325 goto smb3signkey_ret;
326 }
327
328 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
329 i, 4);
330 if (rc) {
331 cifs_server_dbg(VFS, "%s: Could not update with n\n", __func__);
332 goto smb3signkey_ret;
333 }
334
335 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
336 label.iov_base, label.iov_len);
337 if (rc) {
338 cifs_server_dbg(VFS, "%s: Could not update with label\n", __func__);
339 goto smb3signkey_ret;
340 }
341
342 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
343 &zero, 1);
344 if (rc) {
345 cifs_server_dbg(VFS, "%s: Could not update with zero\n", __func__);
346 goto smb3signkey_ret;
347 }
348
349 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
350 context.iov_base, context.iov_len);
351 if (rc) {
352 cifs_server_dbg(VFS, "%s: Could not update with context\n", __func__);
353 goto smb3signkey_ret;
354 }
355
356 if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
357 (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)) {
358 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
359 L256, 4);
360 } else {
361 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
362 L128, 4);
363 }
364 if (rc) {
365 cifs_server_dbg(VFS, "%s: Could not update with L\n", __func__);
366 goto smb3signkey_ret;
367 }
368
369 rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
370 hashptr);
371 if (rc) {
372 cifs_server_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
373 goto smb3signkey_ret;
374 }
375
376 memcpy(key, hashptr, key_size);
377
378smb3signkey_ret:
379 return rc;
380}
381
382struct derivation {
383 struct kvec label;
384 struct kvec context;
385};
386
387struct derivation_triplet {
388 struct derivation signing;
389 struct derivation encryption;
390 struct derivation decryption;
391};
392
393static int
394generate_smb3signingkey(struct cifs_ses *ses,
395 const struct derivation_triplet *ptriplet)
396{
397 int rc;
398#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
399 struct TCP_Server_Info *server = ses->server;
400#endif
401
402
403
404
405
406
407
408
409
410
411
412 if (ses->binding) {
413 rc = generate_key(ses, ptriplet->signing.label,
414 ptriplet->signing.context,
415 cifs_ses_binding_channel(ses)->signkey,
416 SMB3_SIGN_KEY_SIZE);
417 if (rc)
418 return rc;
419 } else {
420 rc = generate_key(ses, ptriplet->signing.label,
421 ptriplet->signing.context,
422 ses->smb3signingkey,
423 SMB3_SIGN_KEY_SIZE);
424 if (rc)
425 return rc;
426
427 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
428 SMB3_SIGN_KEY_SIZE);
429
430 rc = generate_key(ses, ptriplet->encryption.label,
431 ptriplet->encryption.context,
432 ses->smb3encryptionkey,
433 SMB3_ENC_DEC_KEY_SIZE);
434 rc = generate_key(ses, ptriplet->decryption.label,
435 ptriplet->decryption.context,
436 ses->smb3decryptionkey,
437 SMB3_ENC_DEC_KEY_SIZE);
438 if (rc)
439 return rc;
440 }
441
442 if (rc)
443 return rc;
444
445#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
446 cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
447
448
449
450
451 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
452 &ses->Suid);
453 cifs_dbg(VFS, "Cipher type %d\n", server->cipher_type);
454 cifs_dbg(VFS, "Session Key %*ph\n",
455 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
456 cifs_dbg(VFS, "Signing Key %*ph\n",
457 SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
458 if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
459 (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)) {
460 cifs_dbg(VFS, "ServerIn Key %*ph\n",
461 SMB3_GCM256_CRYPTKEY_SIZE, ses->smb3encryptionkey);
462 cifs_dbg(VFS, "ServerOut Key %*ph\n",
463 SMB3_GCM256_CRYPTKEY_SIZE, ses->smb3decryptionkey);
464 } else {
465 cifs_dbg(VFS, "ServerIn Key %*ph\n",
466 SMB3_GCM128_CRYPTKEY_SIZE, ses->smb3encryptionkey);
467 cifs_dbg(VFS, "ServerOut Key %*ph\n",
468 SMB3_GCM128_CRYPTKEY_SIZE, ses->smb3decryptionkey);
469 }
470#endif
471 return rc;
472}
473
474int
475generate_smb30signingkey(struct cifs_ses *ses)
476
477{
478 struct derivation_triplet triplet;
479 struct derivation *d;
480
481 d = &triplet.signing;
482 d->label.iov_base = "SMB2AESCMAC";
483 d->label.iov_len = 12;
484 d->context.iov_base = "SmbSign";
485 d->context.iov_len = 8;
486
487 d = &triplet.encryption;
488 d->label.iov_base = "SMB2AESCCM";
489 d->label.iov_len = 11;
490 d->context.iov_base = "ServerIn ";
491 d->context.iov_len = 10;
492
493 d = &triplet.decryption;
494 d->label.iov_base = "SMB2AESCCM";
495 d->label.iov_len = 11;
496 d->context.iov_base = "ServerOut";
497 d->context.iov_len = 10;
498
499 return generate_smb3signingkey(ses, &triplet);
500}
501
502int
503generate_smb311signingkey(struct cifs_ses *ses)
504
505{
506 struct derivation_triplet triplet;
507 struct derivation *d;
508
509 d = &triplet.signing;
510 d->label.iov_base = "SMBSigningKey";
511 d->label.iov_len = 14;
512 d->context.iov_base = ses->preauth_sha_hash;
513 d->context.iov_len = 64;
514
515 d = &triplet.encryption;
516 d->label.iov_base = "SMBC2SCipherKey";
517 d->label.iov_len = 16;
518 d->context.iov_base = ses->preauth_sha_hash;
519 d->context.iov_len = 64;
520
521 d = &triplet.decryption;
522 d->label.iov_base = "SMBS2CCipherKey";
523 d->label.iov_len = 16;
524 d->context.iov_base = ses->preauth_sha_hash;
525 d->context.iov_len = 64;
526
527 return generate_smb3signingkey(ses, &triplet);
528}
529
530int
531smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
532 bool allocate_crypto)
533{
534 int rc;
535 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
536 unsigned char *sigptr = smb3_signature;
537 struct kvec *iov = rqst->rq_iov;
538 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[0].iov_base;
539 struct shash_desc *shash;
540 struct crypto_shash *hash;
541 struct sdesc *sdesc = NULL;
542 struct smb_rqst drqst;
543 u8 key[SMB3_SIGN_KEY_SIZE];
544
545 rc = smb2_get_sign_key(shdr->SessionId, server, key);
546 if (rc)
547 return 0;
548
549 if (allocate_crypto) {
550 rc = cifs_alloc_hash("cmac(aes)", &hash, &sdesc);
551 if (rc)
552 return rc;
553
554 shash = &sdesc->shash;
555 } else {
556 hash = server->secmech.cmacaes;
557 shash = &server->secmech.sdesccmacaes->shash;
558 }
559
560 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
561 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
562
563 rc = crypto_shash_setkey(hash, key, SMB2_CMACAES_SIZE);
564 if (rc) {
565 cifs_server_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
566 goto out;
567 }
568
569
570
571
572
573
574 rc = crypto_shash_init(shash);
575 if (rc) {
576 cifs_server_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
577 goto out;
578 }
579
580
581
582
583
584
585
586
587 drqst = *rqst;
588 if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
589 rc = crypto_shash_update(shash, iov[0].iov_base,
590 iov[0].iov_len);
591 if (rc) {
592 cifs_server_dbg(VFS, "%s: Could not update with payload\n",
593 __func__);
594 goto out;
595 }
596 drqst.rq_iov++;
597 drqst.rq_nvec--;
598 }
599
600 rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
601 if (!rc)
602 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
603
604out:
605 if (allocate_crypto)
606 cifs_free_hash(&hash, &sdesc);
607 return rc;
608}
609
610
611static int
612smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
613{
614 int rc = 0;
615 struct smb2_sync_hdr *shdr;
616 struct smb2_sess_setup_req *ssr;
617 bool is_binding;
618 bool is_signed;
619
620 shdr = (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
621 ssr = (struct smb2_sess_setup_req *)shdr;
622
623 is_binding = shdr->Command == SMB2_SESSION_SETUP &&
624 (ssr->Flags & SMB2_SESSION_REQ_FLAG_BINDING);
625 is_signed = shdr->Flags & SMB2_FLAGS_SIGNED;
626
627 if (!is_signed)
628 return 0;
629 if (server->tcpStatus == CifsNeedNegotiate)
630 return 0;
631 if (!is_binding && !server->session_estab) {
632 strncpy(shdr->Signature, "BSRSPYL", 8);
633 return 0;
634 }
635
636 rc = server->ops->calc_signature(rqst, server, false);
637
638 return rc;
639}
640
641int
642smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
643{
644 unsigned int rc;
645 char server_response_sig[SMB2_SIGNATURE_SIZE];
646 struct smb2_sync_hdr *shdr =
647 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
648
649 if ((shdr->Command == SMB2_NEGOTIATE) ||
650 (shdr->Command == SMB2_SESSION_SETUP) ||
651 (shdr->Command == SMB2_OPLOCK_BREAK) ||
652 server->ignore_signature ||
653 (!server->session_estab))
654 return 0;
655
656
657
658
659
660
661
662 if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
663 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
664 shdr->Command);
665
666
667
668
669
670 memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
671
672 memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
673
674 rc = server->ops->calc_signature(rqst, server, true);
675
676 if (rc)
677 return rc;
678
679 if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE)) {
680 cifs_dbg(VFS, "sign fail cmd 0x%x message id 0x%llx\n",
681 shdr->Command, shdr->MessageId);
682 return -EACCES;
683 } else
684 return 0;
685}
686
687
688
689
690
691static inline void
692smb2_seq_num_into_buf(struct TCP_Server_Info *server,
693 struct smb2_sync_hdr *shdr)
694{
695 unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
696
697 shdr->MessageId = get_next_mid64(server);
698
699 for (i = 1; i < num; i++)
700 get_next_mid(server);
701}
702
703static struct mid_q_entry *
704smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr,
705 struct TCP_Server_Info *server)
706{
707 struct mid_q_entry *temp;
708 unsigned int credits = le16_to_cpu(shdr->CreditCharge);
709
710 if (server == NULL) {
711 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
712 return NULL;
713 }
714
715 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
716 memset(temp, 0, sizeof(struct mid_q_entry));
717 kref_init(&temp->refcount);
718 temp->mid = le64_to_cpu(shdr->MessageId);
719 temp->credits = credits > 0 ? credits : 1;
720 temp->pid = current->pid;
721 temp->command = shdr->Command;
722 temp->when_alloc = jiffies;
723 temp->server = server;
724
725
726
727
728
729 get_task_struct(current);
730 temp->creator = current;
731 temp->callback = cifs_wake_up_task;
732 temp->callback_data = current;
733
734 atomic_inc(&midCount);
735 temp->mid_state = MID_REQUEST_ALLOCATED;
736 trace_smb3_cmd_enter(shdr->TreeId, shdr->SessionId,
737 le16_to_cpu(shdr->Command), temp->mid);
738 return temp;
739}
740
741static int
742smb2_get_mid_entry(struct cifs_ses *ses, struct TCP_Server_Info *server,
743 struct smb2_sync_hdr *shdr, struct mid_q_entry **mid)
744{
745 if (server->tcpStatus == CifsExiting)
746 return -ENOENT;
747
748 if (server->tcpStatus == CifsNeedReconnect) {
749 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
750 return -EAGAIN;
751 }
752
753 if (server->tcpStatus == CifsNeedNegotiate &&
754 shdr->Command != SMB2_NEGOTIATE)
755 return -EAGAIN;
756
757 if (ses->status == CifsNew) {
758 if ((shdr->Command != SMB2_SESSION_SETUP) &&
759 (shdr->Command != SMB2_NEGOTIATE))
760 return -EAGAIN;
761
762 }
763
764 if (ses->status == CifsExiting) {
765 if (shdr->Command != SMB2_LOGOFF)
766 return -EAGAIN;
767
768 }
769
770 *mid = smb2_mid_entry_alloc(shdr, server);
771 if (*mid == NULL)
772 return -ENOMEM;
773 spin_lock(&GlobalMid_Lock);
774 list_add_tail(&(*mid)->qhead, &server->pending_mid_q);
775 spin_unlock(&GlobalMid_Lock);
776
777 return 0;
778}
779
780int
781smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
782 bool log_error)
783{
784 unsigned int len = mid->resp_buf_size;
785 struct kvec iov[1];
786 struct smb_rqst rqst = { .rq_iov = iov,
787 .rq_nvec = 1 };
788
789 iov[0].iov_base = (char *)mid->resp_buf;
790 iov[0].iov_len = len;
791
792 dump_smb(mid->resp_buf, min_t(u32, 80, len));
793
794 if (len > 24 && server->sign && !mid->decrypted) {
795 int rc;
796
797 rc = smb2_verify_signature(&rqst, server);
798 if (rc)
799 cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n",
800 rc);
801 }
802
803 return map_smb2_to_linux_error(mid->resp_buf, log_error);
804}
805
806struct mid_q_entry *
807smb2_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *server,
808 struct smb_rqst *rqst)
809{
810 int rc;
811 struct smb2_sync_hdr *shdr =
812 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
813 struct mid_q_entry *mid;
814
815 smb2_seq_num_into_buf(server, shdr);
816
817 rc = smb2_get_mid_entry(ses, server, shdr, &mid);
818 if (rc) {
819 revert_current_mid_from_hdr(server, shdr);
820 return ERR_PTR(rc);
821 }
822
823 rc = smb2_sign_rqst(rqst, server);
824 if (rc) {
825 revert_current_mid_from_hdr(server, shdr);
826 cifs_delete_mid(mid);
827 return ERR_PTR(rc);
828 }
829
830 return mid;
831}
832
833struct mid_q_entry *
834smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
835{
836 int rc;
837 struct smb2_sync_hdr *shdr =
838 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
839 struct mid_q_entry *mid;
840
841 if (server->tcpStatus == CifsNeedNegotiate &&
842 shdr->Command != SMB2_NEGOTIATE)
843 return ERR_PTR(-EAGAIN);
844
845 smb2_seq_num_into_buf(server, shdr);
846
847 mid = smb2_mid_entry_alloc(shdr, server);
848 if (mid == NULL) {
849 revert_current_mid_from_hdr(server, shdr);
850 return ERR_PTR(-ENOMEM);
851 }
852
853 rc = smb2_sign_rqst(rqst, server);
854 if (rc) {
855 revert_current_mid_from_hdr(server, shdr);
856 DeleteMidQEntry(mid);
857 return ERR_PTR(rc);
858 }
859
860 return mid;
861}
862
863int
864smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
865{
866 struct crypto_aead *tfm;
867
868 if (!server->secmech.ccmaesencrypt) {
869 if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
870 (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
871 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
872 else
873 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
874 if (IS_ERR(tfm)) {
875 cifs_server_dbg(VFS, "%s: Failed alloc encrypt aead\n",
876 __func__);
877 return PTR_ERR(tfm);
878 }
879 server->secmech.ccmaesencrypt = tfm;
880 }
881
882 if (!server->secmech.ccmaesdecrypt) {
883 if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
884 (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
885 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
886 else
887 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
888 if (IS_ERR(tfm)) {
889 crypto_free_aead(server->secmech.ccmaesencrypt);
890 server->secmech.ccmaesencrypt = NULL;
891 cifs_server_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
892 __func__);
893 return PTR_ERR(tfm);
894 }
895 server->secmech.ccmaesdecrypt = tfm;
896 }
897
898 return 0;
899}
900
