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)
46 return cifs_alloc_hash("hmac(sha256)",
47 &server->secmech.hmacsha256,
48 &server->secmech.sdeschmacsha256);
52 smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
54 struct cifs_secmech *p = &server->secmech;
57 rc = cifs_alloc_hash("hmac(sha256)",
63 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
69 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
73 #ifdef CONFIG_CIFS_SMB311
75 smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
77 struct cifs_secmech *p = &server->secmech;
80 rc = cifs_alloc_hash("hmac(sha256)",
86 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
90 rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
97 cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
98 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
103 static struct cifs_ses *
104 smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
106 struct cifs_ses *ses;
108 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
109 if (ses->Suid != ses_id)
118 smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
120 struct cifs_ses *ses;
122 spin_lock(&cifs_tcp_ses_lock);
123 ses = smb2_find_smb_ses_unlocked(server, ses_id);
124 spin_unlock(&cifs_tcp_ses_lock);
129 static struct cifs_tcon *
130 smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid)
132 struct cifs_tcon *tcon;
134 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
135 if (tcon->tid != tid)
145 * Obtain tcon corresponding to the tid in the given
150 smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid)
152 struct cifs_ses *ses;
153 struct cifs_tcon *tcon;
155 spin_lock(&cifs_tcp_ses_lock);
156 ses = smb2_find_smb_ses_unlocked(server, ses_id);
158 spin_unlock(&cifs_tcp_ses_lock);
161 tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
162 spin_unlock(&cifs_tcp_ses_lock);
168 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
171 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
172 unsigned char *sigptr = smb2_signature;
173 struct kvec *iov = rqst->rq_iov;
174 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
175 struct cifs_ses *ses;
177 ses = smb2_find_smb_ses(server, shdr->SessionId);
179 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
183 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
184 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
186 rc = smb2_crypto_shash_allocate(server);
188 cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
192 rc = crypto_shash_setkey(server->secmech.hmacsha256,
193 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
195 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
199 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
201 cifs_dbg(VFS, "%s: Could not init sha256", __func__);
205 rc = __cifs_calc_signature(rqst, server, sigptr,
206 &server->secmech.sdeschmacsha256->shash);
209 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
214 static int generate_key(struct cifs_ses *ses, struct kvec label,
215 struct kvec context, __u8 *key, unsigned int key_size)
217 unsigned char zero = 0x0;
218 __u8 i[4] = {0, 0, 0, 1};
219 __u8 L[4] = {0, 0, 0, 128};
221 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
222 unsigned char *hashptr = prfhash;
224 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
225 memset(key, 0x0, key_size);
227 rc = smb3_crypto_shash_allocate(ses->server);
229 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
230 goto smb3signkey_ret;
233 rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
234 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
236 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
237 goto smb3signkey_ret;
240 rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
242 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
243 goto smb3signkey_ret;
246 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
249 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
250 goto smb3signkey_ret;
253 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
254 label.iov_base, label.iov_len);
256 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
257 goto smb3signkey_ret;
260 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
263 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
264 goto smb3signkey_ret;
267 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
268 context.iov_base, context.iov_len);
270 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
271 goto smb3signkey_ret;
274 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
277 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
278 goto smb3signkey_ret;
281 rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
284 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
285 goto smb3signkey_ret;
288 memcpy(key, hashptr, key_size);
299 struct derivation_triplet {
300 struct derivation signing;
301 struct derivation encryption;
302 struct derivation decryption;
306 generate_smb3signingkey(struct cifs_ses *ses,
307 const struct derivation_triplet *ptriplet)
311 rc = generate_key(ses, ptriplet->signing.label,
312 ptriplet->signing.context, ses->smb3signingkey,
317 rc = generate_key(ses, ptriplet->encryption.label,
318 ptriplet->encryption.context, ses->smb3encryptionkey,
323 rc = generate_key(ses, ptriplet->decryption.label,
324 ptriplet->decryption.context,
325 ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
330 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
331 cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
333 * The session id is opaque in terms of endianness, so we can't
334 * print it as a long long. we dump it as we got it on the wire
336 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
338 cifs_dbg(VFS, "Session Key %*ph\n",
339 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
340 cifs_dbg(VFS, "Signing Key %*ph\n",
341 SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
342 cifs_dbg(VFS, "ServerIn Key %*ph\n",
343 SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey);
344 cifs_dbg(VFS, "ServerOut Key %*ph\n",
345 SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey);
351 generate_smb30signingkey(struct cifs_ses *ses)
354 struct derivation_triplet triplet;
355 struct derivation *d;
357 d = &triplet.signing;
358 d->label.iov_base = "SMB2AESCMAC";
359 d->label.iov_len = 12;
360 d->context.iov_base = "SmbSign";
361 d->context.iov_len = 8;
363 d = &triplet.encryption;
364 d->label.iov_base = "SMB2AESCCM";
365 d->label.iov_len = 11;
366 d->context.iov_base = "ServerIn ";
367 d->context.iov_len = 10;
369 d = &triplet.decryption;
370 d->label.iov_base = "SMB2AESCCM";
371 d->label.iov_len = 11;
372 d->context.iov_base = "ServerOut";
373 d->context.iov_len = 10;
375 return generate_smb3signingkey(ses, &triplet);
378 #ifdef CONFIG_CIFS_SMB311
380 generate_smb311signingkey(struct cifs_ses *ses)
383 struct derivation_triplet triplet;
384 struct derivation *d;
386 d = &triplet.signing;
387 d->label.iov_base = "SMBSigningKey";
388 d->label.iov_len = 14;
389 d->context.iov_base = ses->preauth_sha_hash;
390 d->context.iov_len = 64;
392 d = &triplet.encryption;
393 d->label.iov_base = "SMBC2SCipherKey";
394 d->label.iov_len = 16;
395 d->context.iov_base = ses->preauth_sha_hash;
396 d->context.iov_len = 64;
398 d = &triplet.decryption;
399 d->label.iov_base = "SMBS2CCipherKey";
400 d->label.iov_len = 16;
401 d->context.iov_base = ses->preauth_sha_hash;
402 d->context.iov_len = 64;
404 return generate_smb3signingkey(ses, &triplet);
409 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
412 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
413 unsigned char *sigptr = smb3_signature;
414 struct kvec *iov = rqst->rq_iov;
415 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
416 struct cifs_ses *ses;
418 ses = smb2_find_smb_ses(server, shdr->SessionId);
420 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
424 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
425 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
427 rc = crypto_shash_setkey(server->secmech.cmacaes,
428 ses->smb3signingkey, SMB2_CMACAES_SIZE);
431 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
436 * we already allocate sdesccmacaes when we init smb3 signing key,
437 * so unlike smb2 case we do not have to check here if secmech are
440 rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
442 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
446 rc = __cifs_calc_signature(rqst, server, sigptr,
447 &server->secmech.sdesccmacaes->shash);
450 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
455 /* must be called with server->srv_mutex held */
457 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
460 struct smb2_sync_hdr *shdr =
461 (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
463 if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
464 server->tcpStatus == CifsNeedNegotiate)
467 if (!server->session_estab) {
468 strncpy(shdr->Signature, "BSRSPYL", 8);
472 rc = server->ops->calc_signature(rqst, server);
478 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
481 char server_response_sig[16];
482 struct smb2_sync_hdr *shdr =
483 (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
485 if ((shdr->Command == SMB2_NEGOTIATE) ||
486 (shdr->Command == SMB2_SESSION_SETUP) ||
487 (shdr->Command == SMB2_OPLOCK_BREAK) ||
488 (!server->session_estab))
492 * BB what if signatures are supposed to be on for session but
493 * server does not send one? BB
496 /* Do not need to verify session setups with signature "BSRSPYL " */
497 if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
498 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
502 * Save off the origiginal signature so we can modify the smb and check
503 * our calculated signature against what the server sent.
505 memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
507 memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
509 mutex_lock(&server->srv_mutex);
510 rc = server->ops->calc_signature(rqst, server);
511 mutex_unlock(&server->srv_mutex);
516 if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
523 * Set message id for the request. Should be called after wait_for_free_request
524 * and when srv_mutex is held.
527 smb2_seq_num_into_buf(struct TCP_Server_Info *server,
528 struct smb2_sync_hdr *shdr)
530 unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
532 shdr->MessageId = get_next_mid64(server);
533 /* skip message numbers according to CreditCharge field */
534 for (i = 1; i < num; i++)
535 get_next_mid(server);
538 static struct mid_q_entry *
539 smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr,
540 struct TCP_Server_Info *server)
542 struct mid_q_entry *temp;
544 if (server == NULL) {
545 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
549 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
550 memset(temp, 0, sizeof(struct mid_q_entry));
551 kref_init(&temp->refcount);
552 temp->mid = le64_to_cpu(shdr->MessageId);
553 temp->pid = current->pid;
554 temp->command = shdr->Command; /* Always LE */
555 temp->when_alloc = jiffies;
556 temp->server = server;
559 * The default is for the mid to be synchronous, so the
560 * default callback just wakes up the current task.
562 temp->callback = cifs_wake_up_task;
563 temp->callback_data = current;
565 atomic_inc(&midCount);
566 temp->mid_state = MID_REQUEST_ALLOCATED;
571 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
572 struct mid_q_entry **mid)
574 if (ses->server->tcpStatus == CifsExiting)
577 if (ses->server->tcpStatus == CifsNeedReconnect) {
578 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
582 if (ses->status == CifsNew) {
583 if ((shdr->Command != SMB2_SESSION_SETUP) &&
584 (shdr->Command != SMB2_NEGOTIATE))
586 /* else ok - we are setting up session */
589 if (ses->status == CifsExiting) {
590 if (shdr->Command != SMB2_LOGOFF)
592 /* else ok - we are shutting down the session */
595 *mid = smb2_mid_entry_alloc(shdr, ses->server);
598 spin_lock(&GlobalMid_Lock);
599 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
600 spin_unlock(&GlobalMid_Lock);
605 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
608 unsigned int len = get_rfc1002_length(mid->resp_buf);
610 struct smb_rqst rqst = { .rq_iov = iov,
613 iov[0].iov_base = (char *)mid->resp_buf;
615 iov[1].iov_base = (char *)mid->resp_buf + 4;
616 iov[1].iov_len = len;
618 dump_smb(mid->resp_buf, min_t(u32, 80, len));
619 /* convert the length into a more usable form */
620 if (len > 24 && server->sign && !mid->decrypted) {
623 rc = smb2_verify_signature(&rqst, server);
625 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
629 return map_smb2_to_linux_error(mid->resp_buf, log_error);
633 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
636 struct smb2_sync_hdr *shdr =
637 (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
638 struct mid_q_entry *mid;
640 smb2_seq_num_into_buf(ses->server, shdr);
642 rc = smb2_get_mid_entry(ses, shdr, &mid);
645 rc = smb2_sign_rqst(rqst, ses->server);
647 cifs_delete_mid(mid);
654 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
657 struct smb2_sync_hdr *shdr =
658 (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
659 struct mid_q_entry *mid;
661 smb2_seq_num_into_buf(server, shdr);
663 mid = smb2_mid_entry_alloc(shdr, server);
665 return ERR_PTR(-ENOMEM);
667 rc = smb2_sign_rqst(rqst, server);
669 DeleteMidQEntry(mid);
677 smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
679 struct crypto_aead *tfm;
681 if (!server->secmech.ccmaesencrypt) {
682 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
684 cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
688 server->secmech.ccmaesencrypt = tfm;
691 if (!server->secmech.ccmaesdecrypt) {
692 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
694 crypto_free_aead(server->secmech.ccmaesencrypt);
695 server->secmech.ccmaesencrypt = NULL;
696 cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
700 server->secmech.ccmaesdecrypt = tfm;