2 * fs/cifs/cifsencrypt.c
4 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
5 * for more detailed information
7 * Copyright (C) International Business Machines Corp., 2005,2013
8 * Author(s): Steve French (sfrench@us.ibm.com)
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/slab.h>
29 #include "cifs_debug.h"
30 #include "cifs_unicode.h"
31 #include "cifsproto.h"
33 #include <linux/ctype.h>
34 #include <linux/random.h>
35 #include <linux/highmem.h>
36 #include <crypto/skcipher.h>
39 cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
44 if (server->secmech.sdescmd5 != NULL)
45 return 0; /* already allocated */
47 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
48 if (IS_ERR(server->secmech.md5)) {
49 cifs_dbg(VFS, "could not allocate crypto md5\n");
50 rc = PTR_ERR(server->secmech.md5);
51 server->secmech.md5 = NULL;
55 size = sizeof(struct shash_desc) +
56 crypto_shash_descsize(server->secmech.md5);
57 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
58 if (!server->secmech.sdescmd5) {
59 crypto_free_shash(server->secmech.md5);
60 server->secmech.md5 = NULL;
63 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
64 server->secmech.sdescmd5->shash.flags = 0x0;
70 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
71 * The 16 byte signature must be allocated by the caller. Note we only use the
72 * 1st eight bytes and that the smb header signature field on input contains
73 * the sequence number before this function is called. Also, this function
74 * should be called with the server->srv_mutex held.
76 static int cifs_calc_signature(struct smb_rqst *rqst,
77 struct TCP_Server_Info *server, char *signature)
81 struct kvec *iov = rqst->rq_iov;
82 int n_vec = rqst->rq_nvec;
84 if (iov == NULL || signature == NULL || server == NULL)
87 if (!server->secmech.sdescmd5) {
88 rc = cifs_crypto_shash_md5_allocate(server);
90 cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
95 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
97 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
101 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
102 server->session_key.response, server->session_key.len);
104 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
108 for (i = 0; i < n_vec; i++) {
109 if (iov[i].iov_len == 0)
111 if (iov[i].iov_base == NULL) {
112 cifs_dbg(VFS, "null iovec entry\n");
115 /* The first entry includes a length field (which does not get
116 signed that occupies the first 4 bytes before the header */
118 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
119 break; /* nothing to sign or corrupt header */
121 crypto_shash_update(&server->secmech.sdescmd5->shash,
122 iov[i].iov_base + 4, iov[i].iov_len - 4);
125 crypto_shash_update(&server->secmech.sdescmd5->shash,
126 iov[i].iov_base, iov[i].iov_len);
129 cifs_dbg(VFS, "%s: Could not update with payload\n",
135 /* now hash over the rq_pages array */
136 for (i = 0; i < rqst->rq_npages; i++) {
139 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
140 crypto_shash_update(&server->secmech.sdescmd5->shash,
141 p_iov.iov_base, p_iov.iov_len);
142 kunmap(rqst->rq_pages[i]);
145 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
147 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
152 /* must be called with server->srv_mutex held */
153 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
154 __u32 *pexpected_response_sequence_number)
157 char smb_signature[20];
158 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
160 if ((cifs_pdu == NULL) || (server == NULL))
163 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
164 server->tcpStatus == CifsNeedNegotiate)
167 if (!server->session_estab) {
168 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
172 cifs_pdu->Signature.Sequence.SequenceNumber =
173 cpu_to_le32(server->sequence_number);
174 cifs_pdu->Signature.Sequence.Reserved = 0;
176 *pexpected_response_sequence_number = ++server->sequence_number;
177 ++server->sequence_number;
179 rc = cifs_calc_signature(rqst, server, smb_signature);
181 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
183 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
188 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
189 __u32 *pexpected_response_sequence)
191 struct smb_rqst rqst = { .rq_iov = iov,
194 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
197 /* must be called with server->srv_mutex held */
198 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
199 __u32 *pexpected_response_sequence_number)
203 iov.iov_base = cifs_pdu;
204 iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
206 return cifs_sign_smbv(&iov, 1, server,
207 pexpected_response_sequence_number);
210 int cifs_verify_signature(struct smb_rqst *rqst,
211 struct TCP_Server_Info *server,
212 __u32 expected_sequence_number)
215 char server_response_sig[8];
216 char what_we_think_sig_should_be[20];
217 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
219 if (cifs_pdu == NULL || server == NULL)
222 if (!server->session_estab)
225 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
226 struct smb_com_lock_req *pSMB =
227 (struct smb_com_lock_req *)cifs_pdu;
228 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
232 /* BB what if signatures are supposed to be on for session but
233 server does not send one? BB */
235 /* Do not need to verify session setups with signature "BSRSPYL " */
236 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
237 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
240 /* save off the origiginal signature so we can modify the smb and check
241 its signature against what the server sent */
242 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
244 cifs_pdu->Signature.Sequence.SequenceNumber =
245 cpu_to_le32(expected_sequence_number);
246 cifs_pdu->Signature.Sequence.Reserved = 0;
248 mutex_lock(&server->srv_mutex);
249 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
250 mutex_unlock(&server->srv_mutex);
255 /* cifs_dump_mem("what we think it should be: ",
256 what_we_think_sig_should_be, 16); */
258 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
265 /* first calculate 24 bytes ntlm response and then 16 byte session key */
266 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
269 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
270 char temp_key[CIFS_SESS_KEY_SIZE];
275 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
276 if (!ses->auth_key.response)
279 ses->auth_key.len = temp_len;
281 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
282 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
284 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
289 rc = E_md4hash(ses->password, temp_key, nls_cp);
291 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
296 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
298 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
304 #ifdef CONFIG_CIFS_WEAK_PW_HASH
305 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
306 char *lnm_session_key)
310 char password_with_pad[CIFS_ENCPWD_SIZE];
312 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
314 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
316 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
317 memcpy(lnm_session_key, password_with_pad,
322 /* calculate old style session key */
323 /* calling toupper is less broken than repeatedly
324 calling nls_toupper would be since that will never
325 work for UTF8, but neither handles multibyte code pages
326 but the only alternative would be converting to UCS-16 (Unicode)
327 (using a routine something like UniStrupr) then
328 uppercasing and then converting back from Unicode - which
329 would only worth doing it if we knew it were utf8. Basically
330 utf8 and other multibyte codepages each need their own strupper
331 function since a byte at a time will ont work. */
333 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
334 password_with_pad[i] = toupper(password_with_pad[i]);
336 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
340 #endif /* CIFS_WEAK_PW_HASH */
342 /* Build a proper attribute value/target info pairs blob.
343 * Fill in netbios and dns domain name and workstation name
344 * and client time (total five av pairs and + one end of fields indicator.
345 * Allocate domain name which gets freed when session struct is deallocated.
348 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
351 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
352 char *defdmname = "WORKGROUP";
353 unsigned char *blobptr;
354 struct ntlmssp2_name *attrptr;
356 if (!ses->domainName) {
357 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
358 if (!ses->domainName)
362 dlen = strlen(ses->domainName);
365 * The length of this blob is two times the size of a
366 * structure (av pair) which holds name/size
367 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
368 * unicode length of a netbios domain name
370 ses->auth_key.len = size + 2 * dlen;
371 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
372 if (!ses->auth_key.response) {
373 ses->auth_key.len = 0;
377 blobptr = ses->auth_key.response;
378 attrptr = (struct ntlmssp2_name *) blobptr;
381 * As defined in MS-NTLM 3.3.2, just this av pair field
382 * is sufficient as part of the temp
384 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
385 attrptr->length = cpu_to_le16(2 * dlen);
386 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
387 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
392 /* Server has provided av pairs/target info in the type 2 challenge
393 * packet and we have plucked it and stored within smb session.
394 * We parse that blob here to find netbios domain name to be used
395 * as part of ntlmv2 authentication (in Target String), if not already
396 * specified on the command line.
397 * If this function returns without any error but without fetching
398 * domain name, authentication may fail against some server but
399 * may not fail against other (those who are not very particular
400 * about target string i.e. for some, just user name might suffice.
403 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
405 unsigned int attrsize;
407 unsigned int onesize = sizeof(struct ntlmssp2_name);
408 unsigned char *blobptr;
409 unsigned char *blobend;
410 struct ntlmssp2_name *attrptr;
412 if (!ses->auth_key.len || !ses->auth_key.response)
415 blobptr = ses->auth_key.response;
416 blobend = blobptr + ses->auth_key.len;
418 while (blobptr + onesize < blobend) {
419 attrptr = (struct ntlmssp2_name *) blobptr;
420 type = le16_to_cpu(attrptr->type);
421 if (type == NTLMSSP_AV_EOL)
423 blobptr += 2; /* advance attr type */
424 attrsize = le16_to_cpu(attrptr->length);
425 blobptr += 2; /* advance attr size */
426 if (blobptr + attrsize > blobend)
428 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
429 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
431 if (!ses->domainName) {
433 kmalloc(attrsize + 1, GFP_KERNEL);
434 if (!ses->domainName)
436 cifs_from_utf16(ses->domainName,
437 (__le16 *)blobptr, attrsize, attrsize,
438 nls_cp, NO_MAP_UNI_RSVD);
442 blobptr += attrsize; /* advance attr value */
448 /* Server has provided av pairs/target info in the type 2 challenge
449 * packet and we have plucked it and stored within smb session.
450 * We parse that blob here to find the server given timestamp
451 * as part of ntlmv2 authentication (or local current time as
452 * default in case of failure)
455 find_timestamp(struct cifs_ses *ses)
457 unsigned int attrsize;
459 unsigned int onesize = sizeof(struct ntlmssp2_name);
460 unsigned char *blobptr;
461 unsigned char *blobend;
462 struct ntlmssp2_name *attrptr;
464 if (!ses->auth_key.len || !ses->auth_key.response)
467 blobptr = ses->auth_key.response;
468 blobend = blobptr + ses->auth_key.len;
470 while (blobptr + onesize < blobend) {
471 attrptr = (struct ntlmssp2_name *) blobptr;
472 type = le16_to_cpu(attrptr->type);
473 if (type == NTLMSSP_AV_EOL)
475 blobptr += 2; /* advance attr type */
476 attrsize = le16_to_cpu(attrptr->length);
477 blobptr += 2; /* advance attr size */
478 if (blobptr + attrsize > blobend)
480 if (type == NTLMSSP_AV_TIMESTAMP) {
481 if (attrsize == sizeof(u64))
482 return *((__le64 *)blobptr);
484 blobptr += attrsize; /* advance attr value */
487 return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
490 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
491 const struct nls_table *nls_cp)
495 char nt_hash[CIFS_NTHASH_SIZE];
500 if (!ses->server->secmech.sdeschmacmd5) {
501 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
505 /* calculate md4 hash of password */
506 E_md4hash(ses->password, nt_hash, nls_cp);
508 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
511 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
515 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
517 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
521 /* convert ses->user_name to unicode */
522 len = ses->user_name ? strlen(ses->user_name) : 0;
523 user = kmalloc(2 + (len * 2), GFP_KERNEL);
530 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
533 memset(user, '\0', 2);
536 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
537 (char *)user, 2 * len);
540 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
544 /* convert ses->domainName to unicode and uppercase */
545 if (ses->domainName) {
546 len = strlen(ses->domainName);
548 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
549 if (domain == NULL) {
553 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
556 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
557 (char *)domain, 2 * len);
560 cifs_dbg(VFS, "%s: Could not update with domain\n",
565 /* We use ses->serverName if no domain name available */
566 len = strlen(ses->serverName);
568 server = kmalloc(2 + (len * 2), GFP_KERNEL);
569 if (server == NULL) {
573 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
576 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
577 (char *)server, 2 * len);
580 cifs_dbg(VFS, "%s: Could not update with server\n",
586 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
589 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
595 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
598 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
599 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
600 unsigned int hash_len;
602 /* The MD5 hash starts at challenge_key.key */
603 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
604 offsetof(struct ntlmv2_resp, challenge.key[0]));
606 if (!ses->server->secmech.sdeschmacmd5) {
607 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
611 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
612 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
614 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
619 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
621 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
625 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
626 memcpy(ntlmv2->challenge.key,
627 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
629 memcpy(ntlmv2->challenge.key,
630 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
631 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
632 ntlmv2->challenge.key, hash_len);
634 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
638 /* Note that the MD5 digest over writes anon.challenge_key.key */
639 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
640 ntlmv2->ntlmv2_hash);
642 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
647 static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
652 /* check if already allocated */
653 if (server->secmech.sdeschmacmd5)
656 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
657 if (IS_ERR(server->secmech.hmacmd5)) {
658 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
659 rc = PTR_ERR(server->secmech.hmacmd5);
660 server->secmech.hmacmd5 = NULL;
664 size = sizeof(struct shash_desc) +
665 crypto_shash_descsize(server->secmech.hmacmd5);
666 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
667 if (!server->secmech.sdeschmacmd5) {
668 crypto_free_shash(server->secmech.hmacmd5);
669 server->secmech.hmacmd5 = NULL;
672 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
673 server->secmech.sdeschmacmd5->shash.flags = 0x0;
679 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
684 struct ntlmv2_resp *ntlmv2;
685 char ntlmv2_hash[16];
686 unsigned char *tiblob = NULL; /* target info blob */
687 __le64 rsp_timestamp;
689 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
690 if (!ses->domainName) {
691 rc = find_domain_name(ses, nls_cp);
693 cifs_dbg(VFS, "error %d finding domain name\n",
695 goto setup_ntlmv2_rsp_ret;
699 rc = build_avpair_blob(ses, nls_cp);
701 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
702 goto setup_ntlmv2_rsp_ret;
706 /* Must be within 5 minutes of the server (or in range +/-2h
707 * in case of Mac OS X), so simply carry over server timestamp
708 * (as Windows 7 does)
710 rsp_timestamp = find_timestamp(ses);
712 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
713 tilen = ses->auth_key.len;
714 tiblob = ses->auth_key.response;
716 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
717 if (!ses->auth_key.response) {
719 ses->auth_key.len = 0;
720 goto setup_ntlmv2_rsp_ret;
722 ses->auth_key.len += baselen;
724 ntlmv2 = (struct ntlmv2_resp *)
725 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
726 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
727 ntlmv2->reserved = 0;
728 ntlmv2->time = rsp_timestamp;
730 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
731 ntlmv2->reserved2 = 0;
733 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
735 rc = crypto_hmacmd5_alloc(ses->server);
737 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
738 goto setup_ntlmv2_rsp_ret;
741 /* calculate ntlmv2_hash */
742 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
744 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
745 goto setup_ntlmv2_rsp_ret;
748 /* calculate first part of the client response (CR1) */
749 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
751 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
752 goto setup_ntlmv2_rsp_ret;
755 /* now calculate the session key for NTLMv2 */
756 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
757 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
759 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
761 goto setup_ntlmv2_rsp_ret;
764 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
766 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
767 goto setup_ntlmv2_rsp_ret;
770 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
772 CIFS_HMAC_MD5_HASH_SIZE);
774 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
775 goto setup_ntlmv2_rsp_ret;
778 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
779 ses->auth_key.response);
781 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
783 setup_ntlmv2_rsp_ret:
790 calc_seckey(struct cifs_ses *ses)
793 struct crypto_skcipher *tfm_arc4;
794 struct scatterlist sgin, sgout;
795 struct skcipher_request *req;
796 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
798 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
800 tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
801 if (IS_ERR(tfm_arc4)) {
802 rc = PTR_ERR(tfm_arc4);
803 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
807 rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
810 cifs_dbg(VFS, "%s: Could not set response as a key\n",
812 goto out_free_cipher;
815 req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
818 cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
819 goto out_free_cipher;
822 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
823 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
825 skcipher_request_set_callback(req, 0, NULL, NULL);
826 skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
828 rc = crypto_skcipher_encrypt(req);
829 skcipher_request_free(req);
831 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
832 goto out_free_cipher;
835 /* make secondary_key/nonce as session key */
836 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
837 /* and make len as that of session key only */
838 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
841 crypto_free_skcipher(tfm_arc4);
847 cifs_crypto_shash_release(struct TCP_Server_Info *server)
849 if (server->secmech.cmacaes) {
850 crypto_free_shash(server->secmech.cmacaes);
851 server->secmech.cmacaes = NULL;
854 if (server->secmech.hmacsha256) {
855 crypto_free_shash(server->secmech.hmacsha256);
856 server->secmech.hmacsha256 = NULL;
859 if (server->secmech.md5) {
860 crypto_free_shash(server->secmech.md5);
861 server->secmech.md5 = NULL;
864 if (server->secmech.hmacmd5) {
865 crypto_free_shash(server->secmech.hmacmd5);
866 server->secmech.hmacmd5 = NULL;
869 kfree(server->secmech.sdesccmacaes);
870 server->secmech.sdesccmacaes = NULL;
871 kfree(server->secmech.sdeschmacsha256);
872 server->secmech.sdeschmacsha256 = NULL;
873 kfree(server->secmech.sdeschmacmd5);
874 server->secmech.sdeschmacmd5 = NULL;
875 kfree(server->secmech.sdescmd5);
876 server->secmech.sdescmd5 = NULL;