2 * fs/cifs/smb2transport.c
4 * Copyright (C) International Business Machines Corp., 2002, 2011
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Jeremy Allison (jra@samba.org) 2006
8 * Pavel Shilovsky (pshilovsky@samba.org) 2012
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.
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.
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
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>
37 #include "cifsproto.h"
38 #include "smb2proto.h"
39 #include "cifs_debug.h"
40 #include "smb2status.h"
44 smb2_crypto_shash_allocate(struct TCP_Server_Info
*server
)
49 if (server
->secmech
.sdeschmacsha256
!= NULL
)
50 return 0; /* already allocated */
52 server
->secmech
.hmacsha256
= crypto_alloc_shash("hmac(sha256)", 0, 0);
53 if (IS_ERR(server
->secmech
.hmacsha256
)) {
54 cifs_dbg(VFS
, "could not allocate crypto hmacsha256\n");
55 rc
= PTR_ERR(server
->secmech
.hmacsha256
);
56 server
->secmech
.hmacsha256
= NULL
;
60 size
= sizeof(struct shash_desc
) +
61 crypto_shash_descsize(server
->secmech
.hmacsha256
);
62 server
->secmech
.sdeschmacsha256
= kmalloc(size
, GFP_KERNEL
);
63 if (!server
->secmech
.sdeschmacsha256
) {
64 crypto_free_shash(server
->secmech
.hmacsha256
);
65 server
->secmech
.hmacsha256
= NULL
;
68 server
->secmech
.sdeschmacsha256
->shash
.tfm
= server
->secmech
.hmacsha256
;
69 server
->secmech
.sdeschmacsha256
->shash
.flags
= 0x0;
75 smb3_crypto_shash_allocate(struct TCP_Server_Info
*server
)
80 if (server
->secmech
.sdesccmacaes
!= NULL
)
81 return 0; /* already allocated */
83 rc
= smb2_crypto_shash_allocate(server
);
87 server
->secmech
.cmacaes
= crypto_alloc_shash("cmac(aes)", 0, 0);
88 if (IS_ERR(server
->secmech
.cmacaes
)) {
89 cifs_dbg(VFS
, "could not allocate crypto cmac-aes");
90 kfree(server
->secmech
.sdeschmacsha256
);
91 server
->secmech
.sdeschmacsha256
= NULL
;
92 crypto_free_shash(server
->secmech
.hmacsha256
);
93 server
->secmech
.hmacsha256
= NULL
;
94 rc
= PTR_ERR(server
->secmech
.cmacaes
);
95 server
->secmech
.cmacaes
= NULL
;
99 size
= sizeof(struct shash_desc
) +
100 crypto_shash_descsize(server
->secmech
.cmacaes
);
101 server
->secmech
.sdesccmacaes
= kmalloc(size
, GFP_KERNEL
);
102 if (!server
->secmech
.sdesccmacaes
) {
103 cifs_dbg(VFS
, "%s: Can't alloc cmacaes\n", __func__
);
104 kfree(server
->secmech
.sdeschmacsha256
);
105 server
->secmech
.sdeschmacsha256
= NULL
;
106 crypto_free_shash(server
->secmech
.hmacsha256
);
107 crypto_free_shash(server
->secmech
.cmacaes
);
108 server
->secmech
.hmacsha256
= NULL
;
109 server
->secmech
.cmacaes
= NULL
;
112 server
->secmech
.sdesccmacaes
->shash
.tfm
= server
->secmech
.cmacaes
;
113 server
->secmech
.sdesccmacaes
->shash
.flags
= 0x0;
118 static struct cifs_ses
*
119 smb2_find_smb_ses_unlocked(struct TCP_Server_Info
*server
, __u64 ses_id
)
121 struct cifs_ses
*ses
;
123 list_for_each_entry(ses
, &server
->smb_ses_list
, smb_ses_list
) {
124 if (ses
->Suid
!= ses_id
)
133 smb2_find_smb_ses(struct TCP_Server_Info
*server
, __u64 ses_id
)
135 struct cifs_ses
*ses
;
137 spin_lock(&cifs_tcp_ses_lock
);
138 ses
= smb2_find_smb_ses_unlocked(server
, ses_id
);
139 spin_unlock(&cifs_tcp_ses_lock
);
144 static struct cifs_tcon
*
145 smb2_find_smb_sess_tcon_unlocked(struct cifs_ses
*ses
, __u32 tid
)
147 struct cifs_tcon
*tcon
;
149 list_for_each_entry(tcon
, &ses
->tcon_list
, tcon_list
) {
150 if (tcon
->tid
!= tid
)
160 * Obtain tcon corresponding to the tid in the given
165 smb2_find_smb_tcon(struct TCP_Server_Info
*server
, __u64 ses_id
, __u32 tid
)
167 struct cifs_ses
*ses
;
168 struct cifs_tcon
*tcon
;
170 spin_lock(&cifs_tcp_ses_lock
);
171 ses
= smb2_find_smb_ses_unlocked(server
, ses_id
);
173 spin_unlock(&cifs_tcp_ses_lock
);
176 tcon
= smb2_find_smb_sess_tcon_unlocked(ses
, tid
);
177 spin_unlock(&cifs_tcp_ses_lock
);
183 smb2_calc_signature(struct smb_rqst
*rqst
, struct TCP_Server_Info
*server
)
186 unsigned char smb2_signature
[SMB2_HMACSHA256_SIZE
];
187 unsigned char *sigptr
= smb2_signature
;
188 struct kvec
*iov
= rqst
->rq_iov
;
189 struct smb2_sync_hdr
*shdr
= (struct smb2_sync_hdr
*)iov
[1].iov_base
;
190 struct cifs_ses
*ses
;
192 ses
= smb2_find_smb_ses(server
, shdr
->SessionId
);
194 cifs_dbg(VFS
, "%s: Could not find session\n", __func__
);
198 memset(smb2_signature
, 0x0, SMB2_HMACSHA256_SIZE
);
199 memset(shdr
->Signature
, 0x0, SMB2_SIGNATURE_SIZE
);
201 rc
= smb2_crypto_shash_allocate(server
);
203 cifs_dbg(VFS
, "%s: shah256 alloc failed\n", __func__
);
207 rc
= crypto_shash_setkey(server
->secmech
.hmacsha256
,
208 ses
->auth_key
.response
, SMB2_NTLMV2_SESSKEY_SIZE
);
210 cifs_dbg(VFS
, "%s: Could not update with response\n", __func__
);
214 rc
= crypto_shash_init(&server
->secmech
.sdeschmacsha256
->shash
);
216 cifs_dbg(VFS
, "%s: Could not init sha256", __func__
);
220 rc
= __cifs_calc_signature(rqst
, server
, sigptr
,
221 &server
->secmech
.sdeschmacsha256
->shash
);
224 memcpy(shdr
->Signature
, sigptr
, SMB2_SIGNATURE_SIZE
);
229 static int generate_key(struct cifs_ses
*ses
, struct kvec label
,
230 struct kvec context
, __u8
*key
, unsigned int key_size
)
232 unsigned char zero
= 0x0;
233 __u8 i
[4] = {0, 0, 0, 1};
234 __u8 L
[4] = {0, 0, 0, 128};
236 unsigned char prfhash
[SMB2_HMACSHA256_SIZE
];
237 unsigned char *hashptr
= prfhash
;
239 memset(prfhash
, 0x0, SMB2_HMACSHA256_SIZE
);
240 memset(key
, 0x0, key_size
);
242 rc
= smb3_crypto_shash_allocate(ses
->server
);
244 cifs_dbg(VFS
, "%s: crypto alloc failed\n", __func__
);
245 goto smb3signkey_ret
;
248 rc
= crypto_shash_setkey(ses
->server
->secmech
.hmacsha256
,
249 ses
->auth_key
.response
, SMB2_NTLMV2_SESSKEY_SIZE
);
251 cifs_dbg(VFS
, "%s: Could not set with session key\n", __func__
);
252 goto smb3signkey_ret
;
255 rc
= crypto_shash_init(&ses
->server
->secmech
.sdeschmacsha256
->shash
);
257 cifs_dbg(VFS
, "%s: Could not init sign hmac\n", __func__
);
258 goto smb3signkey_ret
;
261 rc
= crypto_shash_update(&ses
->server
->secmech
.sdeschmacsha256
->shash
,
264 cifs_dbg(VFS
, "%s: Could not update with n\n", __func__
);
265 goto smb3signkey_ret
;
268 rc
= crypto_shash_update(&ses
->server
->secmech
.sdeschmacsha256
->shash
,
269 label
.iov_base
, label
.iov_len
);
271 cifs_dbg(VFS
, "%s: Could not update with label\n", __func__
);
272 goto smb3signkey_ret
;
275 rc
= crypto_shash_update(&ses
->server
->secmech
.sdeschmacsha256
->shash
,
278 cifs_dbg(VFS
, "%s: Could not update with zero\n", __func__
);
279 goto smb3signkey_ret
;
282 rc
= crypto_shash_update(&ses
->server
->secmech
.sdeschmacsha256
->shash
,
283 context
.iov_base
, context
.iov_len
);
285 cifs_dbg(VFS
, "%s: Could not update with context\n", __func__
);
286 goto smb3signkey_ret
;
289 rc
= crypto_shash_update(&ses
->server
->secmech
.sdeschmacsha256
->shash
,
292 cifs_dbg(VFS
, "%s: Could not update with L\n", __func__
);
293 goto smb3signkey_ret
;
296 rc
= crypto_shash_final(&ses
->server
->secmech
.sdeschmacsha256
->shash
,
299 cifs_dbg(VFS
, "%s: Could not generate sha256 hash\n", __func__
);
300 goto smb3signkey_ret
;
303 memcpy(key
, hashptr
, key_size
);
314 struct derivation_triplet
{
315 struct derivation signing
;
316 struct derivation encryption
;
317 struct derivation decryption
;
321 generate_smb3signingkey(struct cifs_ses
*ses
,
322 const struct derivation_triplet
*ptriplet
)
326 rc
= generate_key(ses
, ptriplet
->signing
.label
,
327 ptriplet
->signing
.context
, ses
->smb3signingkey
,
332 rc
= generate_key(ses
, ptriplet
->encryption
.label
,
333 ptriplet
->encryption
.context
, ses
->smb3encryptionkey
,
338 return generate_key(ses
, ptriplet
->decryption
.label
,
339 ptriplet
->decryption
.context
,
340 ses
->smb3decryptionkey
, SMB3_SIGN_KEY_SIZE
);
344 generate_smb30signingkey(struct cifs_ses
*ses
)
347 struct derivation_triplet triplet
;
348 struct derivation
*d
;
350 d
= &triplet
.signing
;
351 d
->label
.iov_base
= "SMB2AESCMAC";
352 d
->label
.iov_len
= 12;
353 d
->context
.iov_base
= "SmbSign";
354 d
->context
.iov_len
= 8;
356 d
= &triplet
.encryption
;
357 d
->label
.iov_base
= "SMB2AESCCM";
358 d
->label
.iov_len
= 11;
359 d
->context
.iov_base
= "ServerIn ";
360 d
->context
.iov_len
= 10;
362 d
= &triplet
.decryption
;
363 d
->label
.iov_base
= "SMB2AESCCM";
364 d
->label
.iov_len
= 11;
365 d
->context
.iov_base
= "ServerOut";
366 d
->context
.iov_len
= 10;
368 return generate_smb3signingkey(ses
, &triplet
);
372 generate_smb311signingkey(struct cifs_ses
*ses
)
375 struct derivation_triplet triplet
;
376 struct derivation
*d
;
378 d
= &triplet
.signing
;
379 d
->label
.iov_base
= "SMB2AESCMAC";
380 d
->label
.iov_len
= 12;
381 d
->context
.iov_base
= "SmbSign";
382 d
->context
.iov_len
= 8;
384 d
= &triplet
.encryption
;
385 d
->label
.iov_base
= "SMB2AESCCM";
386 d
->label
.iov_len
= 11;
387 d
->context
.iov_base
= "ServerIn ";
388 d
->context
.iov_len
= 10;
390 d
= &triplet
.decryption
;
391 d
->label
.iov_base
= "SMB2AESCCM";
392 d
->label
.iov_len
= 11;
393 d
->context
.iov_base
= "ServerOut";
394 d
->context
.iov_len
= 10;
396 return generate_smb3signingkey(ses
, &triplet
);
400 smb3_calc_signature(struct smb_rqst
*rqst
, struct TCP_Server_Info
*server
)
403 unsigned char smb3_signature
[SMB2_CMACAES_SIZE
];
404 unsigned char *sigptr
= smb3_signature
;
405 struct kvec
*iov
= rqst
->rq_iov
;
406 struct smb2_sync_hdr
*shdr
= (struct smb2_sync_hdr
*)iov
[1].iov_base
;
407 struct cifs_ses
*ses
;
409 ses
= smb2_find_smb_ses(server
, shdr
->SessionId
);
411 cifs_dbg(VFS
, "%s: Could not find session\n", __func__
);
415 memset(smb3_signature
, 0x0, SMB2_CMACAES_SIZE
);
416 memset(shdr
->Signature
, 0x0, SMB2_SIGNATURE_SIZE
);
418 rc
= crypto_shash_setkey(server
->secmech
.cmacaes
,
419 ses
->smb3signingkey
, SMB2_CMACAES_SIZE
);
422 cifs_dbg(VFS
, "%s: Could not set key for cmac aes\n", __func__
);
427 * we already allocate sdesccmacaes when we init smb3 signing key,
428 * so unlike smb2 case we do not have to check here if secmech are
431 rc
= crypto_shash_init(&server
->secmech
.sdesccmacaes
->shash
);
433 cifs_dbg(VFS
, "%s: Could not init cmac aes\n", __func__
);
437 rc
= __cifs_calc_signature(rqst
, server
, sigptr
,
438 &server
->secmech
.sdesccmacaes
->shash
);
441 memcpy(shdr
->Signature
, sigptr
, SMB2_SIGNATURE_SIZE
);
446 /* must be called with server->srv_mutex held */
448 smb2_sign_rqst(struct smb_rqst
*rqst
, struct TCP_Server_Info
*server
)
451 struct smb2_sync_hdr
*shdr
=
452 (struct smb2_sync_hdr
*)rqst
->rq_iov
[1].iov_base
;
454 if (!(shdr
->Flags
& SMB2_FLAGS_SIGNED
) ||
455 server
->tcpStatus
== CifsNeedNegotiate
)
458 if (!server
->session_estab
) {
459 strncpy(shdr
->Signature
, "BSRSPYL", 8);
463 rc
= server
->ops
->calc_signature(rqst
, server
);
469 smb2_verify_signature(struct smb_rqst
*rqst
, struct TCP_Server_Info
*server
)
472 char server_response_sig
[16];
473 struct smb2_sync_hdr
*shdr
=
474 (struct smb2_sync_hdr
*)rqst
->rq_iov
[1].iov_base
;
476 if ((shdr
->Command
== SMB2_NEGOTIATE
) ||
477 (shdr
->Command
== SMB2_SESSION_SETUP
) ||
478 (shdr
->Command
== SMB2_OPLOCK_BREAK
) ||
479 (!server
->session_estab
))
483 * BB what if signatures are supposed to be on for session but
484 * server does not send one? BB
487 /* Do not need to verify session setups with signature "BSRSPYL " */
488 if (memcmp(shdr
->Signature
, "BSRSPYL ", 8) == 0)
489 cifs_dbg(FYI
, "dummy signature received for smb command 0x%x\n",
493 * Save off the origiginal signature so we can modify the smb and check
494 * our calculated signature against what the server sent.
496 memcpy(server_response_sig
, shdr
->Signature
, SMB2_SIGNATURE_SIZE
);
498 memset(shdr
->Signature
, 0, SMB2_SIGNATURE_SIZE
);
500 mutex_lock(&server
->srv_mutex
);
501 rc
= server
->ops
->calc_signature(rqst
, server
);
502 mutex_unlock(&server
->srv_mutex
);
507 if (memcmp(server_response_sig
, shdr
->Signature
, SMB2_SIGNATURE_SIZE
))
514 * Set message id for the request. Should be called after wait_for_free_request
515 * and when srv_mutex is held.
518 smb2_seq_num_into_buf(struct TCP_Server_Info
*server
,
519 struct smb2_sync_hdr
*shdr
)
521 unsigned int i
, num
= le16_to_cpu(shdr
->CreditCharge
);
523 shdr
->MessageId
= get_next_mid64(server
);
524 /* skip message numbers according to CreditCharge field */
525 for (i
= 1; i
< num
; i
++)
526 get_next_mid(server
);
529 static struct mid_q_entry
*
530 smb2_mid_entry_alloc(const struct smb2_sync_hdr
*shdr
,
531 struct TCP_Server_Info
*server
)
533 struct mid_q_entry
*temp
;
535 if (server
== NULL
) {
536 cifs_dbg(VFS
, "Null TCP session in smb2_mid_entry_alloc\n");
540 temp
= mempool_alloc(cifs_mid_poolp
, GFP_NOFS
);
544 memset(temp
, 0, sizeof(struct mid_q_entry
));
545 temp
->mid
= le64_to_cpu(shdr
->MessageId
);
546 temp
->pid
= current
->pid
;
547 temp
->command
= shdr
->Command
; /* Always LE */
548 temp
->when_alloc
= jiffies
;
549 temp
->server
= server
;
552 * The default is for the mid to be synchronous, so the
553 * default callback just wakes up the current task.
555 temp
->callback
= cifs_wake_up_task
;
556 temp
->callback_data
= current
;
559 atomic_inc(&midCount
);
560 temp
->mid_state
= MID_REQUEST_ALLOCATED
;
565 smb2_get_mid_entry(struct cifs_ses
*ses
, struct smb2_sync_hdr
*shdr
,
566 struct mid_q_entry
**mid
)
568 if (ses
->server
->tcpStatus
== CifsExiting
)
571 if (ses
->server
->tcpStatus
== CifsNeedReconnect
) {
572 cifs_dbg(FYI
, "tcp session dead - return to caller to retry\n");
576 if (ses
->status
== CifsNew
) {
577 if ((shdr
->Command
!= SMB2_SESSION_SETUP
) &&
578 (shdr
->Command
!= SMB2_NEGOTIATE
))
580 /* else ok - we are setting up session */
583 if (ses
->status
== CifsExiting
) {
584 if (shdr
->Command
!= SMB2_LOGOFF
)
586 /* else ok - we are shutting down the session */
589 *mid
= smb2_mid_entry_alloc(shdr
, ses
->server
);
592 spin_lock(&GlobalMid_Lock
);
593 list_add_tail(&(*mid
)->qhead
, &ses
->server
->pending_mid_q
);
594 spin_unlock(&GlobalMid_Lock
);
599 smb2_check_receive(struct mid_q_entry
*mid
, struct TCP_Server_Info
*server
,
602 unsigned int len
= get_rfc1002_length(mid
->resp_buf
);
604 struct smb_rqst rqst
= { .rq_iov
= iov
,
607 iov
[0].iov_base
= (char *)mid
->resp_buf
;
609 iov
[1].iov_base
= (char *)mid
->resp_buf
+ 4;
610 iov
[1].iov_len
= len
;
612 dump_smb(mid
->resp_buf
, min_t(u32
, 80, len
));
613 /* convert the length into a more usable form */
614 if (len
> 24 && server
->sign
&& !mid
->decrypted
) {
617 rc
= smb2_verify_signature(&rqst
, server
);
619 cifs_dbg(VFS
, "SMB signature verification returned error = %d\n",
623 return map_smb2_to_linux_error(mid
->resp_buf
, log_error
);
627 smb2_setup_request(struct cifs_ses
*ses
, struct smb_rqst
*rqst
)
630 struct smb2_sync_hdr
*shdr
=
631 (struct smb2_sync_hdr
*)rqst
->rq_iov
[1].iov_base
;
632 struct mid_q_entry
*mid
;
634 smb2_seq_num_into_buf(ses
->server
, shdr
);
636 rc
= smb2_get_mid_entry(ses
, shdr
, &mid
);
639 rc
= smb2_sign_rqst(rqst
, ses
->server
);
641 cifs_delete_mid(mid
);
648 smb2_setup_async_request(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
)
651 struct smb2_sync_hdr
*shdr
=
652 (struct smb2_sync_hdr
*)rqst
->rq_iov
[1].iov_base
;
653 struct mid_q_entry
*mid
;
655 smb2_seq_num_into_buf(server
, shdr
);
657 mid
= smb2_mid_entry_alloc(shdr
, server
);
659 return ERR_PTR(-ENOMEM
);
661 rc
= smb2_sign_rqst(rqst
, server
);
663 DeleteMidQEntry(mid
);
671 smb3_crypto_aead_allocate(struct TCP_Server_Info
*server
)
673 struct crypto_aead
*tfm
;
675 if (!server
->secmech
.ccmaesencrypt
) {
676 tfm
= crypto_alloc_aead("ccm(aes)", 0, 0);
678 cifs_dbg(VFS
, "%s: Failed to alloc encrypt aead\n",
682 server
->secmech
.ccmaesencrypt
= tfm
;
685 if (!server
->secmech
.ccmaesdecrypt
) {
686 tfm
= crypto_alloc_aead("ccm(aes)", 0, 0);
688 crypto_free_aead(server
->secmech
.ccmaesencrypt
);
689 server
->secmech
.ccmaesencrypt
= NULL
;
690 cifs_dbg(VFS
, "%s: Failed to alloc decrypt aead\n",
694 server
->secmech
.ccmaesdecrypt
= tfm
;