/fs/cifs/cifsencrypt.c
C | 762 lines | 547 code | 137 blank | 78 comment | 106 complexity | 41dd9ef63beda833ff6b316a00fc572c MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/*
2 * fs/cifs/cifsencrypt.c
3 *
4 * Copyright (C) International Business Machines Corp., 2005,2006
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/fs.h>
23#include <linux/slab.h>
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifs_debug.h"
27#include "cifs_unicode.h"
28#include "cifsproto.h"
29#include "ntlmssp.h"
30#include <linux/ctype.h>
31#include <linux/random.h>
32
33/*
34 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
35 * The 16 byte signature must be allocated by the caller. Note we only use the
36 * 1st eight bytes and that the smb header signature field on input contains
37 * the sequence number before this function is called. Also, this function
38 * should be called with the server->srv_mutex held.
39 */
40static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
41 struct TCP_Server_Info *server, char *signature)
42{
43 int rc;
44
45 if (cifs_pdu == NULL || signature == NULL || server == NULL)
46 return -EINVAL;
47
48 if (!server->secmech.sdescmd5) {
49 cERROR(1, "%s: Can't generate signature\n", __func__);
50 return -1;
51 }
52
53 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
54 if (rc) {
55 cERROR(1, "%s: Oould not init md5\n", __func__);
56 return rc;
57 }
58
59 crypto_shash_update(&server->secmech.sdescmd5->shash,
60 server->session_key.response, server->session_key.len);
61
62 crypto_shash_update(&server->secmech.sdescmd5->shash,
63 cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
64
65 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
66
67 return 0;
68}
69
70/* must be called with server->srv_mutex held */
71int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
72 __u32 *pexpected_response_sequence_number)
73{
74 int rc = 0;
75 char smb_signature[20];
76
77 if ((cifs_pdu == NULL) || (server == NULL))
78 return -EINVAL;
79
80 if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
81 return rc;
82
83 cifs_pdu->Signature.Sequence.SequenceNumber =
84 cpu_to_le32(server->sequence_number);
85 cifs_pdu->Signature.Sequence.Reserved = 0;
86
87 *pexpected_response_sequence_number = server->sequence_number++;
88 server->sequence_number++;
89
90 rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
91 if (rc)
92 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
93 else
94 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
95
96 return rc;
97}
98
99static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
100 struct TCP_Server_Info *server, char *signature)
101{
102 int i;
103 int rc;
104
105 if (iov == NULL || signature == NULL || server == NULL)
106 return -EINVAL;
107
108 if (!server->secmech.sdescmd5) {
109 cERROR(1, "%s: Can't generate signature\n", __func__);
110 return -1;
111 }
112
113 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
114 if (rc) {
115 cERROR(1, "%s: Oould not init md5\n", __func__);
116 return rc;
117 }
118
119 crypto_shash_update(&server->secmech.sdescmd5->shash,
120 server->session_key.response, server->session_key.len);
121
122 for (i = 0; i < n_vec; i++) {
123 if (iov[i].iov_len == 0)
124 continue;
125 if (iov[i].iov_base == NULL) {
126 cERROR(1, "null iovec entry");
127 return -EIO;
128 }
129 /* The first entry includes a length field (which does not get
130 signed that occupies the first 4 bytes before the header */
131 if (i == 0) {
132 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
133 break; /* nothing to sign or corrupt header */
134 crypto_shash_update(&server->secmech.sdescmd5->shash,
135 iov[i].iov_base + 4, iov[i].iov_len - 4);
136 } else
137 crypto_shash_update(&server->secmech.sdescmd5->shash,
138 iov[i].iov_base, iov[i].iov_len);
139 }
140
141 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
142
143 return rc;
144}
145
146/* must be called with server->srv_mutex held */
147int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
148 __u32 *pexpected_response_sequence_number)
149{
150 int rc = 0;
151 char smb_signature[20];
152 struct smb_hdr *cifs_pdu = iov[0].iov_base;
153
154 if ((cifs_pdu == NULL) || (server == NULL))
155 return -EINVAL;
156
157 if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
158 return rc;
159
160 cifs_pdu->Signature.Sequence.SequenceNumber =
161 cpu_to_le32(server->sequence_number);
162 cifs_pdu->Signature.Sequence.Reserved = 0;
163
164 *pexpected_response_sequence_number = server->sequence_number++;
165 server->sequence_number++;
166
167 rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
168 if (rc)
169 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
170 else
171 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
172
173 return rc;
174}
175
176int cifs_verify_signature(struct smb_hdr *cifs_pdu,
177 struct TCP_Server_Info *server,
178 __u32 expected_sequence_number)
179{
180 unsigned int rc;
181 char server_response_sig[8];
182 char what_we_think_sig_should_be[20];
183
184 if (cifs_pdu == NULL || server == NULL)
185 return -EINVAL;
186
187 if (!server->session_estab)
188 return 0;
189
190 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
191 struct smb_com_lock_req *pSMB =
192 (struct smb_com_lock_req *)cifs_pdu;
193 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
194 return 0;
195 }
196
197 /* BB what if signatures are supposed to be on for session but
198 server does not send one? BB */
199
200 /* Do not need to verify session setups with signature "BSRSPYL " */
201 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
202 cFYI(1, "dummy signature received for smb command 0x%x",
203 cifs_pdu->Command);
204
205 /* save off the origiginal signature so we can modify the smb and check
206 its signature against what the server sent */
207 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
208
209 cifs_pdu->Signature.Sequence.SequenceNumber =
210 cpu_to_le32(expected_sequence_number);
211 cifs_pdu->Signature.Sequence.Reserved = 0;
212
213 mutex_lock(&server->srv_mutex);
214 rc = cifs_calculate_signature(cifs_pdu, server,
215 what_we_think_sig_should_be);
216 mutex_unlock(&server->srv_mutex);
217
218 if (rc)
219 return rc;
220
221/* cifs_dump_mem("what we think it should be: ",
222 what_we_think_sig_should_be, 16); */
223
224 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
225 return -EACCES;
226 else
227 return 0;
228
229}
230
231/* first calculate 24 bytes ntlm response and then 16 byte session key */
232int setup_ntlm_response(struct cifs_ses *ses)
233{
234 int rc = 0;
235 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
236 char temp_key[CIFS_SESS_KEY_SIZE];
237
238 if (!ses)
239 return -EINVAL;
240
241 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
242 if (!ses->auth_key.response) {
243 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
244 return -ENOMEM;
245 }
246 ses->auth_key.len = temp_len;
247
248 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
249 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
250 if (rc) {
251 cFYI(1, "%s Can't generate NTLM response, error: %d",
252 __func__, rc);
253 return rc;
254 }
255
256 rc = E_md4hash(ses->password, temp_key);
257 if (rc) {
258 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
259 return rc;
260 }
261
262 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
263 if (rc)
264 cFYI(1, "%s Can't generate NTLM session key, error: %d",
265 __func__, rc);
266
267 return rc;
268}
269
270#ifdef CONFIG_CIFS_WEAK_PW_HASH
271int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
272 char *lnm_session_key)
273{
274 int i;
275 int rc;
276 char password_with_pad[CIFS_ENCPWD_SIZE];
277
278 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
279 if (password)
280 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
281
282 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
283 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
284 memcpy(lnm_session_key, password_with_pad,
285 CIFS_ENCPWD_SIZE);
286 return 0;
287 }
288
289 /* calculate old style session key */
290 /* calling toupper is less broken than repeatedly
291 calling nls_toupper would be since that will never
292 work for UTF8, but neither handles multibyte code pages
293 but the only alternative would be converting to UCS-16 (Unicode)
294 (using a routine something like UniStrupr) then
295 uppercasing and then converting back from Unicode - which
296 would only worth doing it if we knew it were utf8. Basically
297 utf8 and other multibyte codepages each need their own strupper
298 function since a byte at a time will ont work. */
299
300 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
301 password_with_pad[i] = toupper(password_with_pad[i]);
302
303 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
304
305 return rc;
306}
307#endif /* CIFS_WEAK_PW_HASH */
308
309/* Build a proper attribute value/target info pairs blob.
310 * Fill in netbios and dns domain name and workstation name
311 * and client time (total five av pairs and + one end of fields indicator.
312 * Allocate domain name which gets freed when session struct is deallocated.
313 */
314static int
315build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
316{
317 unsigned int dlen;
318 unsigned int wlen;
319 unsigned int size = 6 * sizeof(struct ntlmssp2_name);
320 __le64 curtime;
321 char *defdmname = "WORKGROUP";
322 unsigned char *blobptr;
323 struct ntlmssp2_name *attrptr;
324
325 if (!ses->domainName) {
326 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
327 if (!ses->domainName)
328 return -ENOMEM;
329 }
330
331 dlen = strlen(ses->domainName);
332 wlen = strlen(ses->server->hostname);
333
334 /* The length of this blob is a size which is
335 * six times the size of a structure which holds name/size +
336 * two times the unicode length of a domain name +
337 * two times the unicode length of a server name +
338 * size of a timestamp (which is 8 bytes).
339 */
340 ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
341 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
342 if (!ses->auth_key.response) {
343 ses->auth_key.len = 0;
344 cERROR(1, "Challenge target info allocation failure");
345 return -ENOMEM;
346 }
347
348 blobptr = ses->auth_key.response;
349 attrptr = (struct ntlmssp2_name *) blobptr;
350
351 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
352 attrptr->length = cpu_to_le16(2 * dlen);
353 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
354 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
355
356 blobptr += 2 * dlen;
357 attrptr = (struct ntlmssp2_name *) blobptr;
358
359 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
360 attrptr->length = cpu_to_le16(2 * wlen);
361 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
362 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
363
364 blobptr += 2 * wlen;
365 attrptr = (struct ntlmssp2_name *) blobptr;
366
367 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
368 attrptr->length = cpu_to_le16(2 * dlen);
369 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
370 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
371
372 blobptr += 2 * dlen;
373 attrptr = (struct ntlmssp2_name *) blobptr;
374
375 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
376 attrptr->length = cpu_to_le16(2 * wlen);
377 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
378 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
379
380 blobptr += 2 * wlen;
381 attrptr = (struct ntlmssp2_name *) blobptr;
382
383 attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
384 attrptr->length = cpu_to_le16(sizeof(__le64));
385 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
386 curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
387 memcpy(blobptr, &curtime, sizeof(__le64));
388
389 return 0;
390}
391
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.
401 */
402static int
403find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
404{
405 unsigned int attrsize;
406 unsigned int type;
407 unsigned int onesize = sizeof(struct ntlmssp2_name);
408 unsigned char *blobptr;
409 unsigned char *blobend;
410 struct ntlmssp2_name *attrptr;
411
412 if (!ses->auth_key.len || !ses->auth_key.response)
413 return 0;
414
415 blobptr = ses->auth_key.response;
416 blobend = blobptr + ses->auth_key.len;
417
418 while (blobptr + onesize < blobend) {
419 attrptr = (struct ntlmssp2_name *) blobptr;
420 type = le16_to_cpu(attrptr->type);
421 if (type == NTLMSSP_AV_EOL)
422 break;
423 blobptr += 2; /* advance attr type */
424 attrsize = le16_to_cpu(attrptr->length);
425 blobptr += 2; /* advance attr size */
426 if (blobptr + attrsize > blobend)
427 break;
428 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
429 if (!attrsize)
430 break;
431 if (!ses->domainName) {
432 ses->domainName =
433 kmalloc(attrsize + 1, GFP_KERNEL);
434 if (!ses->domainName)
435 return -ENOMEM;
436 cifs_from_ucs2(ses->domainName,
437 (__le16 *)blobptr, attrsize, attrsize,
438 nls_cp, false);
439 break;
440 }
441 }
442 blobptr += attrsize; /* advance attr value */
443 }
444
445 return 0;
446}
447
448static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
449 const struct nls_table *nls_cp)
450{
451 int rc = 0;
452 int len;
453 char nt_hash[CIFS_NTHASH_SIZE];
454 wchar_t *user;
455 wchar_t *domain;
456 wchar_t *server;
457
458 if (!ses->server->secmech.sdeschmacmd5) {
459 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
460 return -1;
461 }
462
463 /* calculate md4 hash of password */
464 E_md4hash(ses->password, nt_hash);
465
466 crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
467 CIFS_NTHASH_SIZE);
468
469 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
470 if (rc) {
471 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
472 return rc;
473 }
474
475 /* convert ses->user_name to unicode and uppercase */
476 len = strlen(ses->user_name);
477 user = kmalloc(2 + (len * 2), GFP_KERNEL);
478 if (user == NULL) {
479 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
480 rc = -ENOMEM;
481 goto calc_exit_2;
482 }
483 len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
484 UniStrupr(user);
485
486 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
487 (char *)user, 2 * len);
488
489 /* convert ses->domainName to unicode and uppercase */
490 if (ses->domainName) {
491 len = strlen(ses->domainName);
492
493 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
494 if (domain == NULL) {
495 cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
496 rc = -ENOMEM;
497 goto calc_exit_1;
498 }
499 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
500 nls_cp);
501 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
502 (char *)domain, 2 * len);
503 kfree(domain);
504 } else if (ses->serverName) {
505 len = strlen(ses->serverName);
506
507 server = kmalloc(2 + (len * 2), GFP_KERNEL);
508 if (server == NULL) {
509 cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
510 rc = -ENOMEM;
511 goto calc_exit_1;
512 }
513 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
514 nls_cp);
515 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
516 (char *)server, 2 * len);
517 kfree(server);
518 }
519
520 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
521 ntlmv2_hash);
522
523calc_exit_1:
524 kfree(user);
525calc_exit_2:
526 return rc;
527}
528
529static int
530CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
531{
532 int rc;
533 unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
534
535 if (!ses->server->secmech.sdeschmacmd5) {
536 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
537 return -1;
538 }
539
540 crypto_shash_setkey(ses->server->secmech.hmacmd5,
541 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
542
543 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
544 if (rc) {
545 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
546 return rc;
547 }
548
549 if (ses->server->secType == RawNTLMSSP)
550 memcpy(ses->auth_key.response + offset,
551 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
552 else
553 memcpy(ses->auth_key.response + offset,
554 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
555 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
556 ses->auth_key.response + offset, ses->auth_key.len - offset);
557
558 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
559 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
560
561 return rc;
562}
563
564
565int
566setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
567{
568 int rc;
569 int baselen;
570 unsigned int tilen;
571 struct ntlmv2_resp *buf;
572 char ntlmv2_hash[16];
573 unsigned char *tiblob = NULL; /* target info blob */
574
575 if (ses->server->secType == RawNTLMSSP) {
576 if (!ses->domainName) {
577 rc = find_domain_name(ses, nls_cp);
578 if (rc) {
579 cERROR(1, "error %d finding domain name", rc);
580 goto setup_ntlmv2_rsp_ret;
581 }
582 }
583 } else {
584 rc = build_avpair_blob(ses, nls_cp);
585 if (rc) {
586 cERROR(1, "error %d building av pair blob", rc);
587 goto setup_ntlmv2_rsp_ret;
588 }
589 }
590
591 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
592 tilen = ses->auth_key.len;
593 tiblob = ses->auth_key.response;
594
595 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
596 if (!ses->auth_key.response) {
597 rc = ENOMEM;
598 ses->auth_key.len = 0;
599 cERROR(1, "%s: Can't allocate auth blob", __func__);
600 goto setup_ntlmv2_rsp_ret;
601 }
602 ses->auth_key.len += baselen;
603
604 buf = (struct ntlmv2_resp *)
605 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
606 buf->blob_signature = cpu_to_le32(0x00000101);
607 buf->reserved = 0;
608 buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
609 get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
610 buf->reserved2 = 0;
611
612 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
613
614 /* calculate ntlmv2_hash */
615 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
616 if (rc) {
617 cERROR(1, "could not get v2 hash rc %d", rc);
618 goto setup_ntlmv2_rsp_ret;
619 }
620
621 /* calculate first part of the client response (CR1) */
622 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
623 if (rc) {
624 cERROR(1, "Could not calculate CR1 rc: %d", rc);
625 goto setup_ntlmv2_rsp_ret;
626 }
627
628 /* now calculate the session key for NTLMv2 */
629 crypto_shash_setkey(ses->server->secmech.hmacmd5,
630 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
631
632 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
633 if (rc) {
634 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
635 goto setup_ntlmv2_rsp_ret;
636 }
637
638 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
639 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
640 CIFS_HMAC_MD5_HASH_SIZE);
641
642 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
643 ses->auth_key.response);
644
645setup_ntlmv2_rsp_ret:
646 kfree(tiblob);
647
648 return rc;
649}
650
651int
652calc_seckey(struct cifs_ses *ses)
653{
654 int rc;
655 struct crypto_blkcipher *tfm_arc4;
656 struct scatterlist sgin, sgout;
657 struct blkcipher_desc desc;
658 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
659
660 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
661
662 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
663 if (IS_ERR(tfm_arc4)) {
664 rc = PTR_ERR(tfm_arc4);
665 cERROR(1, "could not allocate crypto API arc4\n");
666 return rc;
667 }
668
669 desc.tfm = tfm_arc4;
670
671 crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
672 CIFS_SESS_KEY_SIZE);
673
674 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
675 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
676
677 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
678 if (rc) {
679 cERROR(1, "could not encrypt session key rc: %d\n", rc);
680 crypto_free_blkcipher(tfm_arc4);
681 return rc;
682 }
683
684 /* make secondary_key/nonce as session key */
685 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
686 /* and make len as that of session key only */
687 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
688
689 crypto_free_blkcipher(tfm_arc4);
690
691 return 0;
692}
693
694void
695cifs_crypto_shash_release(struct TCP_Server_Info *server)
696{
697 if (server->secmech.md5)
698 crypto_free_shash(server->secmech.md5);
699
700 if (server->secmech.hmacmd5)
701 crypto_free_shash(server->secmech.hmacmd5);
702
703 kfree(server->secmech.sdeschmacmd5);
704
705 kfree(server->secmech.sdescmd5);
706}
707
708int
709cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
710{
711 int rc;
712 unsigned int size;
713
714 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
715 if (IS_ERR(server->secmech.hmacmd5)) {
716 cERROR(1, "could not allocate crypto hmacmd5\n");
717 return PTR_ERR(server->secmech.hmacmd5);
718 }
719
720 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
721 if (IS_ERR(server->secmech.md5)) {
722 cERROR(1, "could not allocate crypto md5\n");
723 rc = PTR_ERR(server->secmech.md5);
724 goto crypto_allocate_md5_fail;
725 }
726
727 size = sizeof(struct shash_desc) +
728 crypto_shash_descsize(server->secmech.hmacmd5);
729 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
730 if (!server->secmech.sdeschmacmd5) {
731 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
732 rc = -ENOMEM;
733 goto crypto_allocate_hmacmd5_sdesc_fail;
734 }
735 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
736 server->secmech.sdeschmacmd5->shash.flags = 0x0;
737
738
739 size = sizeof(struct shash_desc) +
740 crypto_shash_descsize(server->secmech.md5);
741 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
742 if (!server->secmech.sdescmd5) {
743 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
744 rc = -ENOMEM;
745 goto crypto_allocate_md5_sdesc_fail;
746 }
747 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
748 server->secmech.sdescmd5->shash.flags = 0x0;
749
750 return 0;
751
752crypto_allocate_md5_sdesc_fail:
753 kfree(server->secmech.sdeschmacmd5);
754
755crypto_allocate_hmacmd5_sdesc_fail:
756 crypto_free_shash(server->secmech.md5);
757
758crypto_allocate_md5_fail:
759 crypto_free_shash(server->secmech.hmacmd5);
760
761 return rc;
762}