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Linux 4.8.3
[linux/fpc-iii.git] / fs / cifs / cifsencrypt.c
blob8347c90cf483cefbce4995a107666bba61ae7ef4
1 /*
2 * fs/cifs/cifsencrypt.c
3 *
4 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
5 * for more detailed information
6 *
7 * Copyright (C) International Business Machines Corp., 2005,2013
8 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
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.
14 *
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.
19 *
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
23 */
24
25 #include <linux/fs.h>
26 #include <linux/slab.h>
27 #include "cifspdu.h"
28 #include "cifsglob.h"
29 #include "cifs_debug.h"
30 #include "cifs_unicode.h"
31 #include "cifsproto.h"
32 #include "ntlmssp.h"
33 #include <linux/ctype.h>
34 #include <linux/random.h>
35 #include <linux/highmem.h>
36 #include <crypto/skcipher.h>
37
38 static int
39 cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
40 {
41 int rc;
42 unsigned int size;
43
44 if (server->secmech.sdescmd5 != NULL)
45 return 0; /* already allocated */
46
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;
52 return rc;
53 }
54
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;
61 return -ENOMEM;
62 }
63 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
64 server->secmech.sdescmd5->shash.flags = 0x0;
65
66 return 0;
67 }
68
69 int __cifs_calc_signature(struct smb_rqst *rqst,
70 struct TCP_Server_Info *server, char *signature,
71 struct shash_desc *shash)
72 {
73 int i;
74 int rc;
75 struct kvec *iov = rqst->rq_iov;
76 int n_vec = rqst->rq_nvec;
77
78 for (i = 0; i < n_vec; i++) {
79 if (iov[i].iov_len == 0)
80 continue;
81 if (iov[i].iov_base == NULL) {
82 cifs_dbg(VFS, "null iovec entry\n");
83 return -EIO;
84 }
85 /* The first entry includes a length field (which does not get
86 signed that occupies the first 4 bytes before the header */
87 if (i == 0) {
88 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
89 break; /* nothing to sign or corrupt header */
90 rc = crypto_shash_update(shash,
91 iov[i].iov_base + 4, iov[i].iov_len - 4);
92 } else {
93 rc = crypto_shash_update(shash,
94 iov[i].iov_base, iov[i].iov_len);
95 }
96 if (rc) {
97 cifs_dbg(VFS, "%s: Could not update with payload\n",
98 __func__);
99 return rc;
100 }
101 }
102
103 /* now hash over the rq_pages array */
104 for (i = 0; i < rqst->rq_npages; i++) {
105 void *kaddr = kmap(rqst->rq_pages[i]);
106 size_t len = rqst->rq_pagesz;
107
108 if (i == rqst->rq_npages - 1)
109 len = rqst->rq_tailsz;
110
111 crypto_shash_update(shash, kaddr, len);
112
113 kunmap(rqst->rq_pages[i]);
114 }
115
116 rc = crypto_shash_final(shash, signature);
117 if (rc)
118 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
119
120 return rc;
121 }
122
123 /*
124 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
125 * The 16 byte signature must be allocated by the caller. Note we only use the
126 * 1st eight bytes and that the smb header signature field on input contains
127 * the sequence number before this function is called. Also, this function
128 * should be called with the server->srv_mutex held.
129 */
130 static int cifs_calc_signature(struct smb_rqst *rqst,
131 struct TCP_Server_Info *server, char *signature)
132 {
133 int rc;
134
135 if (!rqst->rq_iov || !signature || !server)
136 return -EINVAL;
137
138 if (!server->secmech.sdescmd5) {
139 rc = cifs_crypto_shash_md5_allocate(server);
140 if (rc) {
141 cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
142 return -1;
143 }
144 }
145
146 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
147 if (rc) {
148 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
149 return rc;
150 }
151
152 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
153 server->session_key.response, server->session_key.len);
154 if (rc) {
155 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
156 return rc;
157 }
158
159 return __cifs_calc_signature(rqst, server, signature,
160 &server->secmech.sdescmd5->shash);
161 }
162
163 /* must be called with server->srv_mutex held */
164 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
165 __u32 *pexpected_response_sequence_number)
166 {
167 int rc = 0;
168 char smb_signature[20];
169 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
170
171 if ((cifs_pdu == NULL) || (server == NULL))
172 return -EINVAL;
173
174 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
175 server->tcpStatus == CifsNeedNegotiate)
176 return rc;
177
178 if (!server->session_estab) {
179 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
180 return rc;
181 }
182
183 cifs_pdu->Signature.Sequence.SequenceNumber =
184 cpu_to_le32(server->sequence_number);
185 cifs_pdu->Signature.Sequence.Reserved = 0;
186
187 *pexpected_response_sequence_number = ++server->sequence_number;
188 ++server->sequence_number;
189
190 rc = cifs_calc_signature(rqst, server, smb_signature);
191 if (rc)
192 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
193 else
194 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
195
196 return rc;
197 }
198
199 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
200 __u32 *pexpected_response_sequence)
201 {
202 struct smb_rqst rqst = { .rq_iov = iov,
203 .rq_nvec = n_vec };
204
205 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
206 }
207
208 /* must be called with server->srv_mutex held */
209 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
210 __u32 *pexpected_response_sequence_number)
211 {
212 struct kvec iov;
213
214 iov.iov_base = cifs_pdu;
215 iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
216
217 return cifs_sign_smbv(&iov, 1, server,
218 pexpected_response_sequence_number);
219 }
220
221 int cifs_verify_signature(struct smb_rqst *rqst,
222 struct TCP_Server_Info *server,
223 __u32 expected_sequence_number)
224 {
225 unsigned int rc;
226 char server_response_sig[8];
227 char what_we_think_sig_should_be[20];
228 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
229
230 if (cifs_pdu == NULL || server == NULL)
231 return -EINVAL;
232
233 if (!server->session_estab)
234 return 0;
235
236 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
237 struct smb_com_lock_req *pSMB =
238 (struct smb_com_lock_req *)cifs_pdu;
239 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
240 return 0;
241 }
242
243 /* BB what if signatures are supposed to be on for session but
244 server does not send one? BB */
245
246 /* Do not need to verify session setups with signature "BSRSPYL " */
247 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
248 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
249 cifs_pdu->Command);
250
251 /* save off the origiginal signature so we can modify the smb and check
252 its signature against what the server sent */
253 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
254
255 cifs_pdu->Signature.Sequence.SequenceNumber =
256 cpu_to_le32(expected_sequence_number);
257 cifs_pdu->Signature.Sequence.Reserved = 0;
258
259 mutex_lock(&server->srv_mutex);
260 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
261 mutex_unlock(&server->srv_mutex);
262
263 if (rc)
264 return rc;
265
266 /* cifs_dump_mem("what we think it should be: ",
267 what_we_think_sig_should_be, 16); */
268
269 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
270 return -EACCES;
271 else
272 return 0;
273
274 }
275
276 /* first calculate 24 bytes ntlm response and then 16 byte session key */
277 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
278 {
279 int rc = 0;
280 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
281 char temp_key[CIFS_SESS_KEY_SIZE];
282
283 if (!ses)
284 return -EINVAL;
285
286 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
287 if (!ses->auth_key.response)
288 return -ENOMEM;
289
290 ses->auth_key.len = temp_len;
291
292 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
293 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
294 if (rc) {
295 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
296 __func__, rc);
297 return rc;
298 }
299
300 rc = E_md4hash(ses->password, temp_key, nls_cp);
301 if (rc) {
302 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
303 __func__, rc);
304 return rc;
305 }
306
307 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
308 if (rc)
309 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
310 __func__, rc);
311
312 return rc;
313 }
314
315 #ifdef CONFIG_CIFS_WEAK_PW_HASH
316 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
317 char *lnm_session_key)
318 {
319 int i;
320 int rc;
321 char password_with_pad[CIFS_ENCPWD_SIZE];
322
323 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
324 if (password)
325 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
326
327 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
328 memcpy(lnm_session_key, password_with_pad,
329 CIFS_ENCPWD_SIZE);
330 return 0;
331 }
332
333 /* calculate old style session key */
334 /* calling toupper is less broken than repeatedly
335 calling nls_toupper would be since that will never
336 work for UTF8, but neither handles multibyte code pages
337 but the only alternative would be converting to UCS-16 (Unicode)
338 (using a routine something like UniStrupr) then
339 uppercasing and then converting back from Unicode - which
340 would only worth doing it if we knew it were utf8. Basically
341 utf8 and other multibyte codepages each need their own strupper
342 function since a byte at a time will ont work. */
343
344 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
345 password_with_pad[i] = toupper(password_with_pad[i]);
346
347 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
348
349 return rc;
350 }
351 #endif /* CIFS_WEAK_PW_HASH */
352
353 /* Build a proper attribute value/target info pairs blob.
354 * Fill in netbios and dns domain name and workstation name
355 * and client time (total five av pairs and + one end of fields indicator.
356 * Allocate domain name which gets freed when session struct is deallocated.
357 */
358 static int
359 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
360 {
361 unsigned int dlen;
362 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
363 char *defdmname = "WORKGROUP";
364 unsigned char *blobptr;
365 struct ntlmssp2_name *attrptr;
366
367 if (!ses->domainName) {
368 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
369 if (!ses->domainName)
370 return -ENOMEM;
371 }
372
373 dlen = strlen(ses->domainName);
374
375 /*
376 * The length of this blob is two times the size of a
377 * structure (av pair) which holds name/size
378 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
379 * unicode length of a netbios domain name
380 */
381 ses->auth_key.len = size + 2 * dlen;
382 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
383 if (!ses->auth_key.response) {
384 ses->auth_key.len = 0;
385 return -ENOMEM;
386 }
387
388 blobptr = ses->auth_key.response;
389 attrptr = (struct ntlmssp2_name *) blobptr;
390
391 /*
392 * As defined in MS-NTLM 3.3.2, just this av pair field
393 * is sufficient as part of the temp
394 */
395 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
396 attrptr->length = cpu_to_le16(2 * dlen);
397 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
398 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
399
400 return 0;
401 }
402
403 /* Server has provided av pairs/target info in the type 2 challenge
404 * packet and we have plucked it and stored within smb session.
405 * We parse that blob here to find netbios domain name to be used
406 * as part of ntlmv2 authentication (in Target String), if not already
407 * specified on the command line.
408 * If this function returns without any error but without fetching
409 * domain name, authentication may fail against some server but
410 * may not fail against other (those who are not very particular
411 * about target string i.e. for some, just user name might suffice.
412 */
413 static int
414 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
415 {
416 unsigned int attrsize;
417 unsigned int type;
418 unsigned int onesize = sizeof(struct ntlmssp2_name);
419 unsigned char *blobptr;
420 unsigned char *blobend;
421 struct ntlmssp2_name *attrptr;
422
423 if (!ses->auth_key.len || !ses->auth_key.response)
424 return 0;
425
426 blobptr = ses->auth_key.response;
427 blobend = blobptr + ses->auth_key.len;
428
429 while (blobptr + onesize < blobend) {
430 attrptr = (struct ntlmssp2_name *) blobptr;
431 type = le16_to_cpu(attrptr->type);
432 if (type == NTLMSSP_AV_EOL)
433 break;
434 blobptr += 2; /* advance attr type */
435 attrsize = le16_to_cpu(attrptr->length);
436 blobptr += 2; /* advance attr size */
437 if (blobptr + attrsize > blobend)
438 break;
439 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
440 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
441 break;
442 if (!ses->domainName) {
443 ses->domainName =
444 kmalloc(attrsize + 1, GFP_KERNEL);
445 if (!ses->domainName)
446 return -ENOMEM;
447 cifs_from_utf16(ses->domainName,
448 (__le16 *)blobptr, attrsize, attrsize,
449 nls_cp, NO_MAP_UNI_RSVD);
450 break;
451 }
452 }
453 blobptr += attrsize; /* advance attr value */
454 }
455
456 return 0;
457 }
458
459 /* Server has provided av pairs/target info in the type 2 challenge
460 * packet and we have plucked it and stored within smb session.
461 * We parse that blob here to find the server given timestamp
462 * as part of ntlmv2 authentication (or local current time as
463 * default in case of failure)
464 */
465 static __le64
466 find_timestamp(struct cifs_ses *ses)
467 {
468 unsigned int attrsize;
469 unsigned int type;
470 unsigned int onesize = sizeof(struct ntlmssp2_name);
471 unsigned char *blobptr;
472 unsigned char *blobend;
473 struct ntlmssp2_name *attrptr;
474
475 if (!ses->auth_key.len || !ses->auth_key.response)
476 return 0;
477
478 blobptr = ses->auth_key.response;
479 blobend = blobptr + ses->auth_key.len;
480
481 while (blobptr + onesize < blobend) {
482 attrptr = (struct ntlmssp2_name *) blobptr;
483 type = le16_to_cpu(attrptr->type);
484 if (type == NTLMSSP_AV_EOL)
485 break;
486 blobptr += 2; /* advance attr type */
487 attrsize = le16_to_cpu(attrptr->length);
488 blobptr += 2; /* advance attr size */
489 if (blobptr + attrsize > blobend)
490 break;
491 if (type == NTLMSSP_AV_TIMESTAMP) {
492 if (attrsize == sizeof(u64))
493 return *((__le64 *)blobptr);
494 }
495 blobptr += attrsize; /* advance attr value */
496 }
497
498 return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
499 }
500
501 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
502 const struct nls_table *nls_cp)
503 {
504 int rc = 0;
505 int len;
506 char nt_hash[CIFS_NTHASH_SIZE];
507 __le16 *user;
508 wchar_t *domain;
509 wchar_t *server;
510
511 if (!ses->server->secmech.sdeschmacmd5) {
512 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
513 return -1;
514 }
515
516 /* calculate md4 hash of password */
517 E_md4hash(ses->password, nt_hash, nls_cp);
518
519 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
520 CIFS_NTHASH_SIZE);
521 if (rc) {
522 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
523 return rc;
524 }
525
526 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
527 if (rc) {
528 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
529 return rc;
530 }
531
532 /* convert ses->user_name to unicode */
533 len = ses->user_name ? strlen(ses->user_name) : 0;
534 user = kmalloc(2 + (len * 2), GFP_KERNEL);
535 if (user == NULL) {
536 rc = -ENOMEM;
537 return rc;
538 }
539
540 if (len) {
541 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
542 UniStrupr(user);
543 } else {
544 memset(user, '\0', 2);
545 }
546
547 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
548 (char *)user, 2 * len);
549 kfree(user);
550 if (rc) {
551 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
552 return rc;
553 }
554
555 /* convert ses->domainName to unicode and uppercase */
556 if (ses->domainName) {
557 len = strlen(ses->domainName);
558
559 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
560 if (domain == NULL) {
561 rc = -ENOMEM;
562 return rc;
563 }
564 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
565 nls_cp);
566 rc =
567 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
568 (char *)domain, 2 * len);
569 kfree(domain);
570 if (rc) {
571 cifs_dbg(VFS, "%s: Could not update with domain\n",
572 __func__);
573 return rc;
574 }
575 } else {
576 /* We use ses->serverName if no domain name available */
577 len = strlen(ses->serverName);
578
579 server = kmalloc(2 + (len * 2), GFP_KERNEL);
580 if (server == NULL) {
581 rc = -ENOMEM;
582 return rc;
583 }
584 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
585 nls_cp);
586 rc =
587 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
588 (char *)server, 2 * len);
589 kfree(server);
590 if (rc) {
591 cifs_dbg(VFS, "%s: Could not update with server\n",
592 __func__);
593 return rc;
594 }
595 }
596
597 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
598 ntlmv2_hash);
599 if (rc)
600 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
601
602 return rc;
603 }
604
605 static int
606 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
607 {
608 int rc;
609 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
610 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
611 unsigned int hash_len;
612
613 /* The MD5 hash starts at challenge_key.key */
614 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
615 offsetof(struct ntlmv2_resp, challenge.key[0]));
616
617 if (!ses->server->secmech.sdeschmacmd5) {
618 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
619 return -1;
620 }
621
622 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
623 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
624 if (rc) {
625 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
626 __func__);
627 return rc;
628 }
629
630 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
631 if (rc) {
632 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
633 return rc;
634 }
635
636 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
637 memcpy(ntlmv2->challenge.key,
638 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
639 else
640 memcpy(ntlmv2->challenge.key,
641 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
642 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
643 ntlmv2->challenge.key, hash_len);
644 if (rc) {
645 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
646 return rc;
647 }
648
649 /* Note that the MD5 digest over writes anon.challenge_key.key */
650 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
651 ntlmv2->ntlmv2_hash);
652 if (rc)
653 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
654
655 return rc;
656 }
657
658 static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
659 {
660 int rc;
661 unsigned int size;
662
663 /* check if already allocated */
664 if (server->secmech.sdeschmacmd5)
665 return 0;
666
667 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
668 if (IS_ERR(server->secmech.hmacmd5)) {
669 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
670 rc = PTR_ERR(server->secmech.hmacmd5);
671 server->secmech.hmacmd5 = NULL;
672 return rc;
673 }
674
675 size = sizeof(struct shash_desc) +
676 crypto_shash_descsize(server->secmech.hmacmd5);
677 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
678 if (!server->secmech.sdeschmacmd5) {
679 crypto_free_shash(server->secmech.hmacmd5);
680 server->secmech.hmacmd5 = NULL;
681 return -ENOMEM;
682 }
683 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
684 server->secmech.sdeschmacmd5->shash.flags = 0x0;
685
686 return 0;
687 }
688
689 int
690 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
691 {
692 int rc;
693 int baselen;
694 unsigned int tilen;
695 struct ntlmv2_resp *ntlmv2;
696 char ntlmv2_hash[16];
697 unsigned char *tiblob = NULL; /* target info blob */
698 __le64 rsp_timestamp;
699
700 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
701 if (!ses->domainName) {
702 rc = find_domain_name(ses, nls_cp);
703 if (rc) {
704 cifs_dbg(VFS, "error %d finding domain name\n",
705 rc);
706 goto setup_ntlmv2_rsp_ret;
707 }
708 }
709 } else {
710 rc = build_avpair_blob(ses, nls_cp);
711 if (rc) {
712 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
713 goto setup_ntlmv2_rsp_ret;
714 }
715 }
716
717 /* Must be within 5 minutes of the server (or in range +/-2h
718 * in case of Mac OS X), so simply carry over server timestamp
719 * (as Windows 7 does)
720 */
721 rsp_timestamp = find_timestamp(ses);
722
723 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
724 tilen = ses->auth_key.len;
725 tiblob = ses->auth_key.response;
726
727 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
728 if (!ses->auth_key.response) {
729 rc = -ENOMEM;
730 ses->auth_key.len = 0;
731 goto setup_ntlmv2_rsp_ret;
732 }
733 ses->auth_key.len += baselen;
734
735 ntlmv2 = (struct ntlmv2_resp *)
736 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
737 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
738 ntlmv2->reserved = 0;
739 ntlmv2->time = rsp_timestamp;
740
741 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
742 ntlmv2->reserved2 = 0;
743
744 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
745
746 mutex_lock(&ses->server->srv_mutex);
747
748 rc = crypto_hmacmd5_alloc(ses->server);
749 if (rc) {
750 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
751 goto unlock;
752 }
753
754 /* calculate ntlmv2_hash */
755 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
756 if (rc) {
757 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
758 goto unlock;
759 }
760
761 /* calculate first part of the client response (CR1) */
762 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
763 if (rc) {
764 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
765 goto unlock;
766 }
767
768 /* now calculate the session key for NTLMv2 */
769 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
770 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
771 if (rc) {
772 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
773 __func__);
774 goto unlock;
775 }
776
777 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
778 if (rc) {
779 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
780 goto unlock;
781 }
782
783 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
784 ntlmv2->ntlmv2_hash,
785 CIFS_HMAC_MD5_HASH_SIZE);
786 if (rc) {
787 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
788 goto unlock;
789 }
790
791 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
792 ses->auth_key.response);
793 if (rc)
794 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
795
796 unlock:
797 mutex_unlock(&ses->server->srv_mutex);
798 setup_ntlmv2_rsp_ret:
799 kfree(tiblob);
800
801 return rc;
802 }
803
804 int
805 calc_seckey(struct cifs_ses *ses)
806 {
807 int rc;
808 struct crypto_skcipher *tfm_arc4;
809 struct scatterlist sgin, sgout;
810 struct skcipher_request *req;
811 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
812
813 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
814
815 tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
816 if (IS_ERR(tfm_arc4)) {
817 rc = PTR_ERR(tfm_arc4);
818 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
819 return rc;
820 }
821
822 rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
823 CIFS_SESS_KEY_SIZE);
824 if (rc) {
825 cifs_dbg(VFS, "%s: Could not set response as a key\n",
826 __func__);
827 goto out_free_cipher;
828 }
829
830 req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
831 if (!req) {
832 rc = -ENOMEM;
833 cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
834 goto out_free_cipher;
835 }
836
837 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
838 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
839
840 skcipher_request_set_callback(req, 0, NULL, NULL);
841 skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
842
843 rc = crypto_skcipher_encrypt(req);
844 skcipher_request_free(req);
845 if (rc) {
846 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
847 goto out_free_cipher;
848 }
849
850 /* make secondary_key/nonce as session key */
851 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
852 /* and make len as that of session key only */
853 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
854
855 out_free_cipher:
856 crypto_free_skcipher(tfm_arc4);
857
858 return rc;
859 }
860
861 void
862 cifs_crypto_shash_release(struct TCP_Server_Info *server)
863 {
864 if (server->secmech.cmacaes) {
865 crypto_free_shash(server->secmech.cmacaes);
866 server->secmech.cmacaes = NULL;
867 }
868
869 if (server->secmech.hmacsha256) {
870 crypto_free_shash(server->secmech.hmacsha256);
871 server->secmech.hmacsha256 = NULL;
872 }
873
874 if (server->secmech.md5) {
875 crypto_free_shash(server->secmech.md5);
876 server->secmech.md5 = NULL;
877 }
878
879 if (server->secmech.hmacmd5) {
880 crypto_free_shash(server->secmech.hmacmd5);
881 server->secmech.hmacmd5 = NULL;
882 }
883
884 kfree(server->secmech.sdesccmacaes);
885 server->secmech.sdesccmacaes = NULL;
886 kfree(server->secmech.sdeschmacsha256);
887 server->secmech.sdeschmacsha256 = NULL;
888 kfree(server->secmech.sdeschmacmd5);
889 server->secmech.sdeschmacmd5 = NULL;
890 kfree(server->secmech.sdescmd5);
891 server->secmech.sdescmd5 = NULL;
892 }
Linux with added FPC-III support