1 /*
2 * fs/cifs/smb2transport.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002, 2011
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Jeremy Allison (jra@samba.org) 2006
8 * Pavel Shilovsky (pshilovsky@samba.org) 2012
9 *
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
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
smb2_crypto_shash_allocate(struct TCP_Server_Info * server)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
smb3_crypto_shash_allocate(struct TCP_Server_Info * server)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
smb311_crypto_shash_allocate(struct TCP_Server_Info * server)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 *
smb2_find_smb_ses_unlocked(struct TCP_Server_Info * server,__u64 ses_id)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 *
smb2_find_smb_ses(struct TCP_Server_Info * server,__u64 ses_id)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 *
smb2_find_smb_sess_tcon_unlocked(struct cifs_ses * ses,__u32 tid)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 * Obtain tcon corresponding to the tid in the given
144 * cifs_ses
145 */
146
147 struct cifs_tcon *
smb2_find_smb_tcon(struct TCP_Server_Info * server,__u64 ses_id,__u32 tid)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
smb2_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)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_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_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_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_dbg(VFS, "%s: Could not init sha256", __func__);
203 return rc;
204 }
205
206 /*
207 * For SMB2+, __cifs_calc_signature() expects to sign only the actual
208 * data, that is, iov[0] should not contain a rfc1002 length.
209 *
210 * Sign the rfc1002 length prior to passing the data (iov[1-N]) down to
211 * __cifs_calc_signature().
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_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
generate_key(struct cifs_ses * ses,struct kvec label,struct kvec context,__u8 * key,unsigned int key_size)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
243 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
244 memset(key, 0x0, key_size);
245
246 rc = smb3_crypto_shash_allocate(ses->server);
247 if (rc) {
248 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
249 goto smb3signkey_ret;
250 }
251
252 rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
253 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
254 if (rc) {
255 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
256 goto smb3signkey_ret;
257 }
258
259 rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
260 if (rc) {
261 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
262 goto smb3signkey_ret;
263 }
264
265 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
266 i, 4);
267 if (rc) {
268 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
269 goto smb3signkey_ret;
270 }
271
272 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
273 label.iov_base, label.iov_len);
274 if (rc) {
275 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
276 goto smb3signkey_ret;
277 }
278
279 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
280 &zero, 1);
281 if (rc) {
282 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
283 goto smb3signkey_ret;
284 }
285
286 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
287 context.iov_base, context.iov_len);
288 if (rc) {
289 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
290 goto smb3signkey_ret;
291 }
292
293 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
294 L, 4);
295 if (rc) {
296 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
297 goto smb3signkey_ret;
298 }
299
300 rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
301 hashptr);
302 if (rc) {
303 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
304 goto smb3signkey_ret;
305 }
306
307 memcpy(key, hashptr, key_size);
308
309 smb3signkey_ret:
310 return rc;
311 }
312
313 struct derivation {
314 struct kvec label;
315 struct kvec context;
316 };
317
318 struct derivation_triplet {
319 struct derivation signing;
320 struct derivation encryption;
321 struct derivation decryption;
322 };
323
324 static int
generate_smb3signingkey(struct cifs_ses * ses,const struct derivation_triplet * ptriplet)325 generate_smb3signingkey(struct cifs_ses *ses,
326 const struct derivation_triplet *ptriplet)
327 {
328 int rc;
329
330 rc = generate_key(ses, ptriplet->signing.label,
331 ptriplet->signing.context, ses->smb3signingkey,
332 SMB3_SIGN_KEY_SIZE);
333 if (rc)
334 return rc;
335
336 rc = generate_key(ses, ptriplet->encryption.label,
337 ptriplet->encryption.context, ses->smb3encryptionkey,
338 SMB3_SIGN_KEY_SIZE);
339 if (rc)
340 return rc;
341
342 rc = generate_key(ses, ptriplet->decryption.label,
343 ptriplet->decryption.context,
344 ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
345
346 if (rc)
347 return rc;
348
349 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
350 cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
351 /*
352 * The session id is opaque in terms of endianness, so we can't
353 * print it as a long long. we dump it as we got it on the wire
354 */
355 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
356 &ses->Suid);
357 cifs_dbg(VFS, "Session Key %*ph\n",
358 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
359 cifs_dbg(VFS, "Signing Key %*ph\n",
360 SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
361 cifs_dbg(VFS, "ServerIn Key %*ph\n",
362 SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey);
363 cifs_dbg(VFS, "ServerOut Key %*ph\n",
364 SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey);
365 #endif
366 return rc;
367 }
368
369 int
generate_smb30signingkey(struct cifs_ses * ses)370 generate_smb30signingkey(struct cifs_ses *ses)
371
372 {
373 struct derivation_triplet triplet;
374 struct derivation *d;
375
376 d = &triplet.signing;
377 d->label.iov_base = "SMB2AESCMAC";
378 d->label.iov_len = 12;
379 d->context.iov_base = "SmbSign";
380 d->context.iov_len = 8;
381
382 d = &triplet.encryption;
383 d->label.iov_base = "SMB2AESCCM";
384 d->label.iov_len = 11;
385 d->context.iov_base = "ServerIn ";
386 d->context.iov_len = 10;
387
388 d = &triplet.decryption;
389 d->label.iov_base = "SMB2AESCCM";
390 d->label.iov_len = 11;
391 d->context.iov_base = "ServerOut";
392 d->context.iov_len = 10;
393
394 return generate_smb3signingkey(ses, &triplet);
395 }
396
397 int
generate_smb311signingkey(struct cifs_ses * ses)398 generate_smb311signingkey(struct cifs_ses *ses)
399
400 {
401 struct derivation_triplet triplet;
402 struct derivation *d;
403
404 d = &triplet.signing;
405 d->label.iov_base = "SMBSigningKey";
406 d->label.iov_len = 14;
407 d->context.iov_base = ses->preauth_sha_hash;
408 d->context.iov_len = 64;
409
410 d = &triplet.encryption;
411 d->label.iov_base = "SMBC2SCipherKey";
412 d->label.iov_len = 16;
413 d->context.iov_base = ses->preauth_sha_hash;
414 d->context.iov_len = 64;
415
416 d = &triplet.decryption;
417 d->label.iov_base = "SMBS2CCipherKey";
418 d->label.iov_len = 16;
419 d->context.iov_base = ses->preauth_sha_hash;
420 d->context.iov_len = 64;
421
422 return generate_smb3signingkey(ses, &triplet);
423 }
424
425 int
smb3_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)426 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
427 {
428 int rc;
429 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
430 unsigned char *sigptr = smb3_signature;
431 struct kvec *iov = rqst->rq_iov;
432 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[0].iov_base;
433 struct cifs_ses *ses;
434 struct shash_desc *shash = &server->secmech.sdesccmacaes->shash;
435 struct smb_rqst drqst;
436
437 ses = smb2_find_smb_ses(server, shdr->SessionId);
438 if (!ses) {
439 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
440 return 0;
441 }
442
443 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
444 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
445
446 rc = crypto_shash_setkey(server->secmech.cmacaes,
447 ses->smb3signingkey, SMB2_CMACAES_SIZE);
448 if (rc) {
449 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
450 return rc;
451 }
452
453 /*
454 * we already allocate sdesccmacaes when we init smb3 signing key,
455 * so unlike smb2 case we do not have to check here if secmech are
456 * initialized
457 */
458 rc = crypto_shash_init(shash);
459 if (rc) {
460 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
461 return rc;
462 }
463
464 /*
465 * For SMB2+, __cifs_calc_signature() expects to sign only the actual
466 * data, that is, iov[0] should not contain a rfc1002 length.
467 *
468 * Sign the rfc1002 length prior to passing the data (iov[1-N]) down to
469 * __cifs_calc_signature().
470 */
471 drqst = *rqst;
472 if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
473 rc = crypto_shash_update(shash, iov[0].iov_base,
474 iov[0].iov_len);
475 if (rc) {
476 cifs_dbg(VFS, "%s: Could not update with payload\n",
477 __func__);
478 return rc;
479 }
480 drqst.rq_iov++;
481 drqst.rq_nvec--;
482 }
483
484 rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
485 if (!rc)
486 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
487
488 return rc;
489 }
490
491 /* must be called with server->srv_mutex held */
492 static int
smb2_sign_rqst(struct smb_rqst * rqst,struct TCP_Server_Info * server)493 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
494 {
495 int rc = 0;
496 struct smb2_sync_hdr *shdr =
497 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
498
499 if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
500 server->tcpStatus == CifsNeedNegotiate)
501 return rc;
502
503 if (!server->session_estab) {
504 strncpy(shdr->Signature, "BSRSPYL", 8);
505 return rc;
506 }
507
508 rc = server->ops->calc_signature(rqst, server);
509
510 return rc;
511 }
512
513 int
smb2_verify_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)514 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
515 {
516 unsigned int rc;
517 char server_response_sig[16];
518 struct smb2_sync_hdr *shdr =
519 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
520
521 if ((shdr->Command == SMB2_NEGOTIATE) ||
522 (shdr->Command == SMB2_SESSION_SETUP) ||
523 (shdr->Command == SMB2_OPLOCK_BREAK) ||
524 (!server->session_estab))
525 return 0;
526
527 /*
528 * BB what if signatures are supposed to be on for session but
529 * server does not send one? BB
530 */
531
532 /* Do not need to verify session setups with signature "BSRSPYL " */
533 if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
534 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
535 shdr->Command);
536
537 /*
538 * Save off the origiginal signature so we can modify the smb and check
539 * our calculated signature against what the server sent.
540 */
541 memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
542
543 memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
544
545 mutex_lock(&server->srv_mutex);
546 rc = server->ops->calc_signature(rqst, server);
547 mutex_unlock(&server->srv_mutex);
548
549 if (rc)
550 return rc;
551
552 if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
553 return -EACCES;
554 else
555 return 0;
556 }
557
558 /*
559 * Set message id for the request. Should be called after wait_for_free_request
560 * and when srv_mutex is held.
561 */
562 static inline void
smb2_seq_num_into_buf(struct TCP_Server_Info * server,struct smb2_sync_hdr * shdr)563 smb2_seq_num_into_buf(struct TCP_Server_Info *server,
564 struct smb2_sync_hdr *shdr)
565 {
566 unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
567
568 shdr->MessageId = get_next_mid64(server);
569 /* skip message numbers according to CreditCharge field */
570 for (i = 1; i < num; i++)
571 get_next_mid(server);
572 }
573
574 static struct mid_q_entry *
smb2_mid_entry_alloc(const struct smb2_sync_hdr * shdr,struct TCP_Server_Info * server)575 smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr,
576 struct TCP_Server_Info *server)
577 {
578 struct mid_q_entry *temp;
579 unsigned int credits = le16_to_cpu(shdr->CreditCharge);
580
581 if (server == NULL) {
582 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
583 return NULL;
584 }
585
586 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
587 memset(temp, 0, sizeof(struct mid_q_entry));
588 kref_init(&temp->refcount);
589 temp->mid = le64_to_cpu(shdr->MessageId);
590 temp->credits = credits > 0 ? credits : 1;
591 temp->pid = current->pid;
592 temp->command = shdr->Command; /* Always LE */
593 temp->when_alloc = jiffies;
594 temp->server = server;
595
596 /*
597 * The default is for the mid to be synchronous, so the
598 * default callback just wakes up the current task.
599 */
600 temp->callback = cifs_wake_up_task;
601 temp->callback_data = current;
602
603 atomic_inc(&midCount);
604 temp->mid_state = MID_REQUEST_ALLOCATED;
605 return temp;
606 }
607
608 static int
smb2_get_mid_entry(struct cifs_ses * ses,struct smb2_sync_hdr * shdr,struct mid_q_entry ** mid)609 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
610 struct mid_q_entry **mid)
611 {
612 if (ses->server->tcpStatus == CifsExiting)
613 return -ENOENT;
614
615 if (ses->server->tcpStatus == CifsNeedReconnect) {
616 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
617 return -EAGAIN;
618 }
619
620 if (ses->status == CifsNew) {
621 if ((shdr->Command != SMB2_SESSION_SETUP) &&
622 (shdr->Command != SMB2_NEGOTIATE))
623 return -EAGAIN;
624 /* else ok - we are setting up session */
625 }
626
627 if (ses->status == CifsExiting) {
628 if (shdr->Command != SMB2_LOGOFF)
629 return -EAGAIN;
630 /* else ok - we are shutting down the session */
631 }
632
633 *mid = smb2_mid_entry_alloc(shdr, ses->server);
634 if (*mid == NULL)
635 return -ENOMEM;
636 spin_lock(&GlobalMid_Lock);
637 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
638 spin_unlock(&GlobalMid_Lock);
639 return 0;
640 }
641
642 int
smb2_check_receive(struct mid_q_entry * mid,struct TCP_Server_Info * server,bool log_error)643 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
644 bool log_error)
645 {
646 unsigned int len = mid->resp_buf_size;
647 struct kvec iov[1];
648 struct smb_rqst rqst = { .rq_iov = iov,
649 .rq_nvec = 1 };
650
651 iov[0].iov_base = (char *)mid->resp_buf;
652 iov[0].iov_len = len;
653
654 dump_smb(mid->resp_buf, min_t(u32, 80, len));
655 /* convert the length into a more usable form */
656 if (len > 24 && server->sign && !mid->decrypted) {
657 int rc;
658
659 rc = smb2_verify_signature(&rqst, server);
660 if (rc)
661 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
662 rc);
663 }
664
665 return map_smb2_to_linux_error(mid->resp_buf, log_error);
666 }
667
668 struct mid_q_entry *
smb2_setup_request(struct cifs_ses * ses,struct smb_rqst * rqst)669 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
670 {
671 int rc;
672 struct smb2_sync_hdr *shdr =
673 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
674 struct mid_q_entry *mid;
675
676 smb2_seq_num_into_buf(ses->server, shdr);
677
678 rc = smb2_get_mid_entry(ses, shdr, &mid);
679 if (rc) {
680 revert_current_mid_from_hdr(ses->server, shdr);
681 return ERR_PTR(rc);
682 }
683
684 rc = smb2_sign_rqst(rqst, ses->server);
685 if (rc) {
686 revert_current_mid_from_hdr(ses->server, shdr);
687 cifs_delete_mid(mid);
688 return ERR_PTR(rc);
689 }
690
691 return mid;
692 }
693
694 struct mid_q_entry *
smb2_setup_async_request(struct TCP_Server_Info * server,struct smb_rqst * rqst)695 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
696 {
697 int rc;
698 struct smb2_sync_hdr *shdr =
699 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
700 struct mid_q_entry *mid;
701
702 smb2_seq_num_into_buf(server, shdr);
703
704 mid = smb2_mid_entry_alloc(shdr, server);
705 if (mid == NULL) {
706 revert_current_mid_from_hdr(server, shdr);
707 return ERR_PTR(-ENOMEM);
708 }
709
710 rc = smb2_sign_rqst(rqst, server);
711 if (rc) {
712 revert_current_mid_from_hdr(server, shdr);
713 DeleteMidQEntry(mid);
714 return ERR_PTR(rc);
715 }
716
717 return mid;
718 }
719
720 int
smb3_crypto_aead_allocate(struct TCP_Server_Info * server)721 smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
722 {
723 struct crypto_aead *tfm;
724
725 if (!server->secmech.ccmaesencrypt) {
726 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
727 if (IS_ERR(tfm)) {
728 cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
729 __func__);
730 return PTR_ERR(tfm);
731 }
732 server->secmech.ccmaesencrypt = tfm;
733 }
734
735 if (!server->secmech.ccmaesdecrypt) {
736 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
737 if (IS_ERR(tfm)) {
738 crypto_free_aead(server->secmech.ccmaesencrypt);
739 server->secmech.ccmaesencrypt = NULL;
740 cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
741 __func__);
742 return PTR_ERR(tfm);
743 }
744 server->secmech.ccmaesdecrypt = tfm;
745 }
746
747 return 0;
748 }
749