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>
37 #include <crypto/aead.h>
40 cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
45 if (server->secmech.sdescmd5 != NULL)
46 return 0; /* already allocated */
48 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
49 if (IS_ERR(server->secmech.md5)) {
50 cifs_dbg(VFS, "could not allocate crypto md5\n");
51 rc = PTR_ERR(server->secmech.md5);
52 server->secmech.md5 = NULL;
56 size = sizeof(struct shash_desc) +
57 crypto_shash_descsize(server->secmech.md5);
58 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
59 if (!server->secmech.sdescmd5) {
60 crypto_free_shash(server->secmech.md5);
61 server->secmech.md5 = NULL;
64 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
65 server->secmech.sdescmd5->shash.flags = 0x0;
70 int __cifs_calc_signature(struct smb_rqst *rqst,
71 struct TCP_Server_Info *server, char *signature,
72 struct shash_desc *shash)
76 struct kvec *iov = rqst->rq_iov;
77 int n_vec = rqst->rq_nvec;
79 if (n_vec < 2 || iov[0].iov_len != 4)
82 for (i = 1; i < n_vec; i++) {
83 if (iov[i].iov_len == 0)
85 if (iov[i].iov_base == NULL) {
86 cifs_dbg(VFS, "null iovec entry\n");
89 if (i == 1 && iov[1].iov_len <= 4)
90 break; /* nothing to sign or corrupt header */
91 rc = crypto_shash_update(shash,
92 iov[i].iov_base, iov[i].iov_len);
94 cifs_dbg(VFS, "%s: Could not update with payload\n",
100 /* now hash over the rq_pages array */
101 for (i = 0; i < rqst->rq_npages; i++) {
102 void *kaddr = kmap(rqst->rq_pages[i]);
103 size_t len = rqst->rq_pagesz;
105 if (i == rqst->rq_npages - 1)
106 len = rqst->rq_tailsz;
108 crypto_shash_update(shash, kaddr, len);
110 kunmap(rqst->rq_pages[i]);
113 rc = crypto_shash_final(shash, signature);
115 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
121 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
122 * The 16 byte signature must be allocated by the caller. Note we only use the
123 * 1st eight bytes and that the smb header signature field on input contains
124 * the sequence number before this function is called. Also, this function
125 * should be called with the server->srv_mutex held.
127 static int cifs_calc_signature(struct smb_rqst *rqst,
128 struct TCP_Server_Info *server, char *signature)
132 if (!rqst->rq_iov || !signature || !server)
135 if (!server->secmech.sdescmd5) {
136 rc = cifs_crypto_shash_md5_allocate(server);
138 cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
143 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
145 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
149 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
150 server->session_key.response, server->session_key.len);
152 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
156 return __cifs_calc_signature(rqst, server, signature,
157 &server->secmech.sdescmd5->shash);
160 /* must be called with server->srv_mutex held */
161 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
162 __u32 *pexpected_response_sequence_number)
165 char smb_signature[20];
166 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
168 if (rqst->rq_iov[0].iov_len != 4 ||
169 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
172 if ((cifs_pdu == NULL) || (server == NULL))
175 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
176 server->tcpStatus == CifsNeedNegotiate)
179 if (!server->session_estab) {
180 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
184 cifs_pdu->Signature.Sequence.SequenceNumber =
185 cpu_to_le32(server->sequence_number);
186 cifs_pdu->Signature.Sequence.Reserved = 0;
188 *pexpected_response_sequence_number = ++server->sequence_number;
189 ++server->sequence_number;
191 rc = cifs_calc_signature(rqst, server, smb_signature);
193 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
195 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
200 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
201 __u32 *pexpected_response_sequence)
203 struct smb_rqst rqst = { .rq_iov = iov,
206 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
209 /* must be called with server->srv_mutex held */
210 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
211 __u32 *pexpected_response_sequence_number)
215 iov[0].iov_base = cifs_pdu;
217 iov[1].iov_base = (char *)cifs_pdu + 4;
218 iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
220 return cifs_sign_smbv(iov, 2, server,
221 pexpected_response_sequence_number);
224 int cifs_verify_signature(struct smb_rqst *rqst,
225 struct TCP_Server_Info *server,
226 __u32 expected_sequence_number)
229 char server_response_sig[8];
230 char what_we_think_sig_should_be[20];
231 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
233 if (rqst->rq_iov[0].iov_len != 4 ||
234 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
237 if (cifs_pdu == NULL || server == NULL)
240 if (!server->session_estab)
243 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
244 struct smb_com_lock_req *pSMB =
245 (struct smb_com_lock_req *)cifs_pdu;
246 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
250 /* BB what if signatures are supposed to be on for session but
251 server does not send one? BB */
253 /* Do not need to verify session setups with signature "BSRSPYL " */
254 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
255 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
258 /* save off the origiginal signature so we can modify the smb and check
259 its signature against what the server sent */
260 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
262 cifs_pdu->Signature.Sequence.SequenceNumber =
263 cpu_to_le32(expected_sequence_number);
264 cifs_pdu->Signature.Sequence.Reserved = 0;
266 mutex_lock(&server->srv_mutex);
267 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
268 mutex_unlock(&server->srv_mutex);
273 /* cifs_dump_mem("what we think it should be: ",
274 what_we_think_sig_should_be, 16); */
276 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
283 /* first calculate 24 bytes ntlm response and then 16 byte session key */
284 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
287 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
288 char temp_key[CIFS_SESS_KEY_SIZE];
293 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
294 if (!ses->auth_key.response)
297 ses->auth_key.len = temp_len;
299 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
300 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
302 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
307 rc = E_md4hash(ses->password, temp_key, nls_cp);
309 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
314 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
316 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
322 #ifdef CONFIG_CIFS_WEAK_PW_HASH
323 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
324 char *lnm_session_key)
328 char password_with_pad[CIFS_ENCPWD_SIZE];
330 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
332 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
334 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
335 memcpy(lnm_session_key, password_with_pad,
340 /* calculate old style session key */
341 /* calling toupper is less broken than repeatedly
342 calling nls_toupper would be since that will never
343 work for UTF8, but neither handles multibyte code pages
344 but the only alternative would be converting to UCS-16 (Unicode)
345 (using a routine something like UniStrupr) then
346 uppercasing and then converting back from Unicode - which
347 would only worth doing it if we knew it were utf8. Basically
348 utf8 and other multibyte codepages each need their own strupper
349 function since a byte at a time will ont work. */
351 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
352 password_with_pad[i] = toupper(password_with_pad[i]);
354 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
358 #endif /* CIFS_WEAK_PW_HASH */
360 /* Build a proper attribute value/target info pairs blob.
361 * Fill in netbios and dns domain name and workstation name
362 * and client time (total five av pairs and + one end of fields indicator.
363 * Allocate domain name which gets freed when session struct is deallocated.
366 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
369 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
370 char *defdmname = "WORKGROUP";
371 unsigned char *blobptr;
372 struct ntlmssp2_name *attrptr;
374 if (!ses->domainName) {
375 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
376 if (!ses->domainName)
380 dlen = strlen(ses->domainName);
383 * The length of this blob is two times the size of a
384 * structure (av pair) which holds name/size
385 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
386 * unicode length of a netbios domain name
388 ses->auth_key.len = size + 2 * dlen;
389 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
390 if (!ses->auth_key.response) {
391 ses->auth_key.len = 0;
395 blobptr = ses->auth_key.response;
396 attrptr = (struct ntlmssp2_name *) blobptr;
399 * As defined in MS-NTLM 3.3.2, just this av pair field
400 * is sufficient as part of the temp
402 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
403 attrptr->length = cpu_to_le16(2 * dlen);
404 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
405 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
410 /* Server has provided av pairs/target info in the type 2 challenge
411 * packet and we have plucked it and stored within smb session.
412 * We parse that blob here to find netbios domain name to be used
413 * as part of ntlmv2 authentication (in Target String), if not already
414 * specified on the command line.
415 * If this function returns without any error but without fetching
416 * domain name, authentication may fail against some server but
417 * may not fail against other (those who are not very particular
418 * about target string i.e. for some, just user name might suffice.
421 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
423 unsigned int attrsize;
425 unsigned int onesize = sizeof(struct ntlmssp2_name);
426 unsigned char *blobptr;
427 unsigned char *blobend;
428 struct ntlmssp2_name *attrptr;
430 if (!ses->auth_key.len || !ses->auth_key.response)
433 blobptr = ses->auth_key.response;
434 blobend = blobptr + ses->auth_key.len;
436 while (blobptr + onesize < blobend) {
437 attrptr = (struct ntlmssp2_name *) blobptr;
438 type = le16_to_cpu(attrptr->type);
439 if (type == NTLMSSP_AV_EOL)
441 blobptr += 2; /* advance attr type */
442 attrsize = le16_to_cpu(attrptr->length);
443 blobptr += 2; /* advance attr size */
444 if (blobptr + attrsize > blobend)
446 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
447 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
449 if (!ses->domainName) {
451 kmalloc(attrsize + 1, GFP_KERNEL);
452 if (!ses->domainName)
454 cifs_from_utf16(ses->domainName,
455 (__le16 *)blobptr, attrsize, attrsize,
456 nls_cp, NO_MAP_UNI_RSVD);
460 blobptr += attrsize; /* advance attr value */
466 /* Server has provided av pairs/target info in the type 2 challenge
467 * packet and we have plucked it and stored within smb session.
468 * We parse that blob here to find the server given timestamp
469 * as part of ntlmv2 authentication (or local current time as
470 * default in case of failure)
473 find_timestamp(struct cifs_ses *ses)
475 unsigned int attrsize;
477 unsigned int onesize = sizeof(struct ntlmssp2_name);
478 unsigned char *blobptr;
479 unsigned char *blobend;
480 struct ntlmssp2_name *attrptr;
482 if (!ses->auth_key.len || !ses->auth_key.response)
485 blobptr = ses->auth_key.response;
486 blobend = blobptr + ses->auth_key.len;
488 while (blobptr + onesize < blobend) {
489 attrptr = (struct ntlmssp2_name *) blobptr;
490 type = le16_to_cpu(attrptr->type);
491 if (type == NTLMSSP_AV_EOL)
493 blobptr += 2; /* advance attr type */
494 attrsize = le16_to_cpu(attrptr->length);
495 blobptr += 2; /* advance attr size */
496 if (blobptr + attrsize > blobend)
498 if (type == NTLMSSP_AV_TIMESTAMP) {
499 if (attrsize == sizeof(u64))
500 return *((__le64 *)blobptr);
502 blobptr += attrsize; /* advance attr value */
505 return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
508 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
509 const struct nls_table *nls_cp)
513 char nt_hash[CIFS_NTHASH_SIZE];
518 if (!ses->server->secmech.sdeschmacmd5) {
519 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
523 /* calculate md4 hash of password */
524 E_md4hash(ses->password, nt_hash, nls_cp);
526 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
529 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
533 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
535 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
539 /* convert ses->user_name to unicode */
540 len = ses->user_name ? strlen(ses->user_name) : 0;
541 user = kmalloc(2 + (len * 2), GFP_KERNEL);
548 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
551 memset(user, '\0', 2);
554 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
555 (char *)user, 2 * len);
558 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
562 /* convert ses->domainName to unicode and uppercase */
563 if (ses->domainName) {
564 len = strlen(ses->domainName);
566 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
567 if (domain == NULL) {
571 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
574 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
575 (char *)domain, 2 * len);
578 cifs_dbg(VFS, "%s: Could not update with domain\n",
583 /* We use ses->serverName if no domain name available */
584 len = strlen(ses->serverName);
586 server = kmalloc(2 + (len * 2), GFP_KERNEL);
587 if (server == NULL) {
591 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
594 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
595 (char *)server, 2 * len);
598 cifs_dbg(VFS, "%s: Could not update with server\n",
604 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
607 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
613 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
616 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
617 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
618 unsigned int hash_len;
620 /* The MD5 hash starts at challenge_key.key */
621 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
622 offsetof(struct ntlmv2_resp, challenge.key[0]));
624 if (!ses->server->secmech.sdeschmacmd5) {
625 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
629 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
630 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
632 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
637 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
639 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
643 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
644 memcpy(ntlmv2->challenge.key,
645 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
647 memcpy(ntlmv2->challenge.key,
648 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
649 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
650 ntlmv2->challenge.key, hash_len);
652 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
656 /* Note that the MD5 digest over writes anon.challenge_key.key */
657 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
658 ntlmv2->ntlmv2_hash);
660 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
665 static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
670 /* check if already allocated */
671 if (server->secmech.sdeschmacmd5)
674 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
675 if (IS_ERR(server->secmech.hmacmd5)) {
676 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
677 rc = PTR_ERR(server->secmech.hmacmd5);
678 server->secmech.hmacmd5 = NULL;
682 size = sizeof(struct shash_desc) +
683 crypto_shash_descsize(server->secmech.hmacmd5);
684 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
685 if (!server->secmech.sdeschmacmd5) {
686 crypto_free_shash(server->secmech.hmacmd5);
687 server->secmech.hmacmd5 = NULL;
690 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
691 server->secmech.sdeschmacmd5->shash.flags = 0x0;
697 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
702 struct ntlmv2_resp *ntlmv2;
703 char ntlmv2_hash[16];
704 unsigned char *tiblob = NULL; /* target info blob */
705 __le64 rsp_timestamp;
707 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
708 if (!ses->domainName) {
709 if (ses->domainAuto) {
710 rc = find_domain_name(ses, nls_cp);
712 cifs_dbg(VFS, "error %d finding domain name\n",
714 goto setup_ntlmv2_rsp_ret;
717 ses->domainName = kstrdup("", GFP_KERNEL);
721 rc = build_avpair_blob(ses, nls_cp);
723 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
724 goto setup_ntlmv2_rsp_ret;
728 /* Must be within 5 minutes of the server (or in range +/-2h
729 * in case of Mac OS X), so simply carry over server timestamp
730 * (as Windows 7 does)
732 rsp_timestamp = find_timestamp(ses);
734 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
735 tilen = ses->auth_key.len;
736 tiblob = ses->auth_key.response;
738 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
739 if (!ses->auth_key.response) {
741 ses->auth_key.len = 0;
742 goto setup_ntlmv2_rsp_ret;
744 ses->auth_key.len += baselen;
746 ntlmv2 = (struct ntlmv2_resp *)
747 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
748 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
749 ntlmv2->reserved = 0;
750 ntlmv2->time = rsp_timestamp;
752 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
753 ntlmv2->reserved2 = 0;
755 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
757 mutex_lock(&ses->server->srv_mutex);
759 rc = crypto_hmacmd5_alloc(ses->server);
761 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
765 /* calculate ntlmv2_hash */
766 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
768 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
772 /* calculate first part of the client response (CR1) */
773 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
775 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
779 /* now calculate the session key for NTLMv2 */
780 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
781 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
783 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
788 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
790 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
794 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
796 CIFS_HMAC_MD5_HASH_SIZE);
798 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
802 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
803 ses->auth_key.response);
805 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
808 mutex_unlock(&ses->server->srv_mutex);
809 setup_ntlmv2_rsp_ret:
816 calc_seckey(struct cifs_ses *ses)
819 struct crypto_skcipher *tfm_arc4;
820 struct scatterlist sgin, sgout;
821 struct skcipher_request *req;
822 unsigned char *sec_key;
824 sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL);
828 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
830 tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
831 if (IS_ERR(tfm_arc4)) {
832 rc = PTR_ERR(tfm_arc4);
833 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
837 rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
840 cifs_dbg(VFS, "%s: Could not set response as a key\n",
842 goto out_free_cipher;
845 req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
848 cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
849 goto out_free_cipher;
852 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
853 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
855 skcipher_request_set_callback(req, 0, NULL, NULL);
856 skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
858 rc = crypto_skcipher_encrypt(req);
859 skcipher_request_free(req);
861 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
862 goto out_free_cipher;
865 /* make secondary_key/nonce as session key */
866 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
867 /* and make len as that of session key only */
868 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
871 crypto_free_skcipher(tfm_arc4);
878 cifs_crypto_secmech_release(struct TCP_Server_Info *server)
880 if (server->secmech.cmacaes) {
881 crypto_free_shash(server->secmech.cmacaes);
882 server->secmech.cmacaes = NULL;
885 if (server->secmech.hmacsha256) {
886 crypto_free_shash(server->secmech.hmacsha256);
887 server->secmech.hmacsha256 = NULL;
890 if (server->secmech.md5) {
891 crypto_free_shash(server->secmech.md5);
892 server->secmech.md5 = NULL;
895 if (server->secmech.hmacmd5) {
896 crypto_free_shash(server->secmech.hmacmd5);
897 server->secmech.hmacmd5 = NULL;
900 if (server->secmech.ccmaesencrypt) {
901 crypto_free_aead(server->secmech.ccmaesencrypt);
902 server->secmech.ccmaesencrypt = NULL;
905 if (server->secmech.ccmaesdecrypt) {
906 crypto_free_aead(server->secmech.ccmaesdecrypt);
907 server->secmech.ccmaesdecrypt = NULL;
910 kfree(server->secmech.sdesccmacaes);
911 server->secmech.sdesccmacaes = NULL;
912 kfree(server->secmech.sdeschmacsha256);
913 server->secmech.sdeschmacsha256 = NULL;
914 kfree(server->secmech.sdeschmacmd5);
915 server->secmech.sdeschmacmd5 = NULL;
916 kfree(server->secmech.sdescmd5);
917 server->secmech.sdescmd5 = NULL;