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>
36 #include "cifsproto.h"
37 #include "smb2proto.h"
38 #include "cifs_debug.h"
39 #include "smb2status.h"
43 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
46 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
47 unsigned char *sigptr = smb2_signature;
48 struct kvec *iov = rqst->rq_iov;
49 int n_vec = rqst->rq_nvec;
50 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
52 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
53 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
55 rc = crypto_shash_setkey(server->secmech.hmacsha256,
56 server->session_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
58 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
62 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
64 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
68 for (i = 0; i < n_vec; i++) {
69 if (iov[i].iov_len == 0)
71 if (iov[i].iov_base == NULL) {
72 cifs_dbg(VFS, "null iovec entry\n");
76 * The first entry includes a length field (which does not get
77 * signed that occupies the first 4 bytes before the header).
80 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
81 break; /* nothing to sign or corrupt header */
84 &server->secmech.sdeschmacsha256->shash,
85 iov[i].iov_base + 4, iov[i].iov_len - 4);
89 &server->secmech.sdeschmacsha256->shash,
90 iov[i].iov_base, iov[i].iov_len);
93 cifs_dbg(VFS, "%s: Could not update with payload\n",
99 /* now hash over the rq_pages array */
100 for (i = 0; i < rqst->rq_npages; i++) {
103 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
104 crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
105 p_iov.iov_base, p_iov.iov_len);
106 kunmap(rqst->rq_pages[i]);
109 rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
112 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
114 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
120 generate_smb3signingkey(struct TCP_Server_Info *server)
122 unsigned char zero = 0x0;
123 __u8 i[4] = {0, 0, 0, 1};
124 __u8 L[4] = {0, 0, 0, 128};
126 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
127 unsigned char *hashptr = prfhash;
129 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
130 memset(server->smb3signingkey, 0x0, SMB3_SIGNKEY_SIZE);
132 rc = crypto_shash_setkey(server->secmech.hmacsha256,
133 server->session_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
135 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
136 goto smb3signkey_ret;
139 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
141 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
142 goto smb3signkey_ret;
145 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
148 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
149 goto smb3signkey_ret;
152 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
155 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
156 goto smb3signkey_ret;
159 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
162 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
163 goto smb3signkey_ret;
166 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
169 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
170 goto smb3signkey_ret;
173 rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
176 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
177 goto smb3signkey_ret;
180 rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
183 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
184 goto smb3signkey_ret;
187 memcpy(server->smb3signingkey, hashptr, SMB3_SIGNKEY_SIZE);
194 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
197 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
198 unsigned char *sigptr = smb3_signature;
199 struct kvec *iov = rqst->rq_iov;
200 int n_vec = rqst->rq_nvec;
201 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
203 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
204 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
206 rc = crypto_shash_setkey(server->secmech.cmacaes,
207 server->smb3signingkey, SMB2_CMACAES_SIZE);
209 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
213 rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
215 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
219 for (i = 0; i < n_vec; i++) {
220 if (iov[i].iov_len == 0)
222 if (iov[i].iov_base == NULL) {
223 cifs_dbg(VFS, "null iovec entry");
227 * The first entry includes a length field (which does not get
228 * signed that occupies the first 4 bytes before the header).
231 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
232 break; /* nothing to sign or corrupt header */
235 &server->secmech.sdesccmacaes->shash,
236 iov[i].iov_base + 4, iov[i].iov_len - 4);
240 &server->secmech.sdesccmacaes->shash,
241 iov[i].iov_base, iov[i].iov_len);
244 cifs_dbg(VFS, "%s: Couldn't update cmac aes with payload\n",
250 /* now hash over the rq_pages array */
251 for (i = 0; i < rqst->rq_npages; i++) {
254 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
255 crypto_shash_update(&server->secmech.sdesccmacaes->shash,
256 p_iov.iov_base, p_iov.iov_len);
257 kunmap(rqst->rq_pages[i]);
260 rc = crypto_shash_final(&server->secmech.sdesccmacaes->shash,
263 cifs_dbg(VFS, "%s: Could not generate cmac aes\n", __func__);
265 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
270 /* must be called with server->srv_mutex held */
272 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
275 struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base;
277 if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) ||
278 server->tcpStatus == CifsNeedNegotiate)
281 if (!server->session_estab) {
282 strncpy(smb2_pdu->Signature, "BSRSPYL", 8);
286 rc = server->ops->calc_signature(rqst, server);
292 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
295 char server_response_sig[16];
296 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
298 if ((smb2_pdu->Command == SMB2_NEGOTIATE) ||
299 (smb2_pdu->Command == SMB2_OPLOCK_BREAK) ||
300 (!server->session_estab))
304 * BB what if signatures are supposed to be on for session but
305 * server does not send one? BB
308 /* Do not need to verify session setups with signature "BSRSPYL " */
309 if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0)
310 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
314 * Save off the origiginal signature so we can modify the smb and check
315 * our calculated signature against what the server sent.
317 memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE);
319 memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE);
321 mutex_lock(&server->srv_mutex);
322 rc = server->ops->calc_signature(rqst, server);
323 mutex_unlock(&server->srv_mutex);
328 if (memcmp(server_response_sig, smb2_pdu->Signature,
329 SMB2_SIGNATURE_SIZE))
336 * Set message id for the request. Should be called after wait_for_free_request
337 * and when srv_mutex is held.
340 smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr)
342 hdr->MessageId = get_next_mid(server);
345 static struct mid_q_entry *
346 smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer,
347 struct TCP_Server_Info *server)
349 struct mid_q_entry *temp;
351 if (server == NULL) {
352 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
356 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
360 memset(temp, 0, sizeof(struct mid_q_entry));
361 temp->mid = smb_buffer->MessageId; /* always LE */
362 temp->pid = current->pid;
363 temp->command = smb_buffer->Command; /* Always LE */
364 temp->when_alloc = jiffies;
365 temp->server = server;
368 * The default is for the mid to be synchronous, so the
369 * default callback just wakes up the current task.
371 temp->callback = cifs_wake_up_task;
372 temp->callback_data = current;
375 atomic_inc(&midCount);
376 temp->mid_state = MID_REQUEST_ALLOCATED;
381 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf,
382 struct mid_q_entry **mid)
384 if (ses->server->tcpStatus == CifsExiting)
387 if (ses->server->tcpStatus == CifsNeedReconnect) {
388 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
392 if (ses->status != CifsGood) {
393 /* check if SMB2 session is bad because we are setting it up */
394 if ((buf->Command != SMB2_SESSION_SETUP) &&
395 (buf->Command != SMB2_NEGOTIATE))
397 /* else ok - we are setting up session */
399 *mid = smb2_mid_entry_alloc(buf, ses->server);
402 spin_lock(&GlobalMid_Lock);
403 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
404 spin_unlock(&GlobalMid_Lock);
409 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
412 unsigned int len = get_rfc1002_length(mid->resp_buf);
414 struct smb_rqst rqst = { .rq_iov = &iov,
417 iov.iov_base = (char *)mid->resp_buf;
418 iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4;
420 dump_smb(mid->resp_buf, min_t(u32, 80, len));
421 /* convert the length into a more usable form */
422 if (len > 24 && server->sign) {
425 rc = smb2_verify_signature(&rqst, server);
427 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
431 return map_smb2_to_linux_error(mid->resp_buf, log_error);
435 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
438 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
439 struct mid_q_entry *mid;
441 smb2_seq_num_into_buf(ses->server, hdr);
443 rc = smb2_get_mid_entry(ses, hdr, &mid);
446 rc = smb2_sign_rqst(rqst, ses->server);
448 cifs_delete_mid(mid);
455 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
458 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
459 struct mid_q_entry *mid;
461 smb2_seq_num_into_buf(server, hdr);
463 mid = smb2_mid_entry_alloc(hdr, server);
465 return ERR_PTR(-ENOMEM);
467 rc = smb2_sign_rqst(rqst, server);
469 DeleteMidQEntry(mid);