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nfs41: implement DESTROY_CLIENTID operation
[linux-btrfs-devel.git] / fs / cifs / cifsencrypt.c
blobe76bfeb68267d19c5874eb85ddd12fac970a804e
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 */
40 static 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: Could not init md5\n", __func__);
56 return rc;
57 }
58
59 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
60 server->session_key.response, server->session_key.len);
61 if (rc) {
62 cERROR(1, "%s: Could not update with response\n", __func__);
63 return rc;
64 }
65
66 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
67 cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
68 if (rc) {
69 cERROR(1, "%s: Could not update with payload\n", __func__);
70 return rc;
71 }
72
73 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
74 if (rc)
75 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
76
77 return rc;
78 }
79
80 /* must be called with server->srv_mutex held */
81 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
82 __u32 *pexpected_response_sequence_number)
83 {
84 int rc = 0;
85 char smb_signature[20];
86
87 if ((cifs_pdu == NULL) || (server == NULL))
88 return -EINVAL;
89
90 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
91 server->tcpStatus == CifsNeedNegotiate)
92 return rc;
93
94 if (!server->session_estab) {
95 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
96 return rc;
97 }
98
99 cifs_pdu->Signature.Sequence.SequenceNumber =
100 cpu_to_le32(server->sequence_number);
101 cifs_pdu->Signature.Sequence.Reserved = 0;
102
103 *pexpected_response_sequence_number = server->sequence_number++;
104 server->sequence_number++;
105
106 rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
107 if (rc)
108 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
109 else
110 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
111
112 return rc;
113 }
114
115 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
116 struct TCP_Server_Info *server, char *signature)
117 {
118 int i;
119 int rc;
120
121 if (iov == NULL || signature == NULL || server == NULL)
122 return -EINVAL;
123
124 if (!server->secmech.sdescmd5) {
125 cERROR(1, "%s: Can't generate signature\n", __func__);
126 return -1;
127 }
128
129 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
130 if (rc) {
131 cERROR(1, "%s: Could not init md5\n", __func__);
132 return rc;
133 }
134
135 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
136 server->session_key.response, server->session_key.len);
137 if (rc) {
138 cERROR(1, "%s: Could not update with response\n", __func__);
139 return rc;
140 }
141
142 for (i = 0; i < n_vec; i++) {
143 if (iov[i].iov_len == 0)
144 continue;
145 if (iov[i].iov_base == NULL) {
146 cERROR(1, "null iovec entry");
147 return -EIO;
148 }
149 /* The first entry includes a length field (which does not get
150 signed that occupies the first 4 bytes before the header */
151 if (i == 0) {
152 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
153 break; /* nothing to sign or corrupt header */
154 rc =
155 crypto_shash_update(&server->secmech.sdescmd5->shash,
156 iov[i].iov_base + 4, iov[i].iov_len - 4);
157 } else {
158 rc =
159 crypto_shash_update(&server->secmech.sdescmd5->shash,
160 iov[i].iov_base, iov[i].iov_len);
161 }
162 if (rc) {
163 cERROR(1, "%s: Could not update with payload\n",
164 __func__);
165 return rc;
166 }
167 }
168
169 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
170 if (rc)
171 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
172
173 return rc;
174 }
175
176 /* must be called with server->srv_mutex held */
177 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
178 __u32 *pexpected_response_sequence_number)
179 {
180 int rc = 0;
181 char smb_signature[20];
182 struct smb_hdr *cifs_pdu = iov[0].iov_base;
183
184 if ((cifs_pdu == NULL) || (server == NULL))
185 return -EINVAL;
186
187 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
188 server->tcpStatus == CifsNeedNegotiate)
189 return rc;
190
191 if (!server->session_estab) {
192 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
193 return rc;
194 }
195
196 cifs_pdu->Signature.Sequence.SequenceNumber =
197 cpu_to_le32(server->sequence_number);
198 cifs_pdu->Signature.Sequence.Reserved = 0;
199
200 *pexpected_response_sequence_number = server->sequence_number++;
201 server->sequence_number++;
202
203 rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
204 if (rc)
205 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
206 else
207 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
208
209 return rc;
210 }
211
212 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
213 struct TCP_Server_Info *server,
214 __u32 expected_sequence_number)
215 {
216 unsigned int rc;
217 char server_response_sig[8];
218 char what_we_think_sig_should_be[20];
219
220 if (cifs_pdu == NULL || server == NULL)
221 return -EINVAL;
222
223 if (!server->session_estab)
224 return 0;
225
226 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
227 struct smb_com_lock_req *pSMB =
228 (struct smb_com_lock_req *)cifs_pdu;
229 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
230 return 0;
231 }
232
233 /* BB what if signatures are supposed to be on for session but
234 server does not send one? BB */
235
236 /* Do not need to verify session setups with signature "BSRSPYL " */
237 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
238 cFYI(1, "dummy signature received for smb command 0x%x",
239 cifs_pdu->Command);
240
241 /* save off the origiginal signature so we can modify the smb and check
242 its signature against what the server sent */
243 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
244
245 cifs_pdu->Signature.Sequence.SequenceNumber =
246 cpu_to_le32(expected_sequence_number);
247 cifs_pdu->Signature.Sequence.Reserved = 0;
248
249 mutex_lock(&server->srv_mutex);
250 rc = cifs_calculate_signature(cifs_pdu, server,
251 what_we_think_sig_should_be);
252 mutex_unlock(&server->srv_mutex);
253
254 if (rc)
255 return rc;
256
257 /* cifs_dump_mem("what we think it should be: ",
258 what_we_think_sig_should_be, 16); */
259
260 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
261 return -EACCES;
262 else
263 return 0;
264
265 }
266
267 /* first calculate 24 bytes ntlm response and then 16 byte session key */
268 int setup_ntlm_response(struct cifs_ses *ses)
269 {
270 int rc = 0;
271 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
272 char temp_key[CIFS_SESS_KEY_SIZE];
273
274 if (!ses)
275 return -EINVAL;
276
277 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
278 if (!ses->auth_key.response) {
279 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
280 return -ENOMEM;
281 }
282 ses->auth_key.len = temp_len;
283
284 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
285 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
286 if (rc) {
287 cFYI(1, "%s Can't generate NTLM response, error: %d",
288 __func__, rc);
289 return rc;
290 }
291
292 rc = E_md4hash(ses->password, temp_key);
293 if (rc) {
294 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
295 return rc;
296 }
297
298 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
299 if (rc)
300 cFYI(1, "%s Can't generate NTLM session key, error: %d",
301 __func__, rc);
302
303 return rc;
304 }
305
306 #ifdef CONFIG_CIFS_WEAK_PW_HASH
307 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
308 char *lnm_session_key)
309 {
310 int i;
311 int rc;
312 char password_with_pad[CIFS_ENCPWD_SIZE];
313
314 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
315 if (password)
316 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
317
318 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
319 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
320 memcpy(lnm_session_key, password_with_pad,
321 CIFS_ENCPWD_SIZE);
322 return 0;
323 }
324
325 /* calculate old style session key */
326 /* calling toupper is less broken than repeatedly
327 calling nls_toupper would be since that will never
328 work for UTF8, but neither handles multibyte code pages
329 but the only alternative would be converting to UCS-16 (Unicode)
330 (using a routine something like UniStrupr) then
331 uppercasing and then converting back from Unicode - which
332 would only worth doing it if we knew it were utf8. Basically
333 utf8 and other multibyte codepages each need their own strupper
334 function since a byte at a time will ont work. */
335
336 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
337 password_with_pad[i] = toupper(password_with_pad[i]);
338
339 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
340
341 return rc;
342 }
343 #endif /* CIFS_WEAK_PW_HASH */
344
345 /* Build a proper attribute value/target info pairs blob.
346 * Fill in netbios and dns domain name and workstation name
347 * and client time (total five av pairs and + one end of fields indicator.
348 * Allocate domain name which gets freed when session struct is deallocated.
349 */
350 static int
351 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
352 {
353 unsigned int dlen;
354 unsigned int wlen;
355 unsigned int size = 6 * sizeof(struct ntlmssp2_name);
356 __le64 curtime;
357 char *defdmname = "WORKGROUP";
358 unsigned char *blobptr;
359 struct ntlmssp2_name *attrptr;
360
361 if (!ses->domainName) {
362 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
363 if (!ses->domainName)
364 return -ENOMEM;
365 }
366
367 dlen = strlen(ses->domainName);
368 wlen = strlen(ses->server->hostname);
369
370 /* The length of this blob is a size which is
371 * six times the size of a structure which holds name/size +
372 * two times the unicode length of a domain name +
373 * two times the unicode length of a server name +
374 * size of a timestamp (which is 8 bytes).
375 */
376 ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
377 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
378 if (!ses->auth_key.response) {
379 ses->auth_key.len = 0;
380 cERROR(1, "Challenge target info allocation failure");
381 return -ENOMEM;
382 }
383
384 blobptr = ses->auth_key.response;
385 attrptr = (struct ntlmssp2_name *) blobptr;
386
387 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
388 attrptr->length = cpu_to_le16(2 * dlen);
389 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
390 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
391
392 blobptr += 2 * dlen;
393 attrptr = (struct ntlmssp2_name *) blobptr;
394
395 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
396 attrptr->length = cpu_to_le16(2 * wlen);
397 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
398 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
399
400 blobptr += 2 * wlen;
401 attrptr = (struct ntlmssp2_name *) blobptr;
402
403 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
404 attrptr->length = cpu_to_le16(2 * dlen);
405 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
406 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
407
408 blobptr += 2 * dlen;
409 attrptr = (struct ntlmssp2_name *) blobptr;
410
411 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
412 attrptr->length = cpu_to_le16(2 * wlen);
413 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
414 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
415
416 blobptr += 2 * wlen;
417 attrptr = (struct ntlmssp2_name *) blobptr;
418
419 attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
420 attrptr->length = cpu_to_le16(sizeof(__le64));
421 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
422 curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
423 memcpy(blobptr, &curtime, sizeof(__le64));
424
425 return 0;
426 }
427
428 /* Server has provided av pairs/target info in the type 2 challenge
429 * packet and we have plucked it and stored within smb session.
430 * We parse that blob here to find netbios domain name to be used
431 * as part of ntlmv2 authentication (in Target String), if not already
432 * specified on the command line.
433 * If this function returns without any error but without fetching
434 * domain name, authentication may fail against some server but
435 * may not fail against other (those who are not very particular
436 * about target string i.e. for some, just user name might suffice.
437 */
438 static int
439 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
440 {
441 unsigned int attrsize;
442 unsigned int type;
443 unsigned int onesize = sizeof(struct ntlmssp2_name);
444 unsigned char *blobptr;
445 unsigned char *blobend;
446 struct ntlmssp2_name *attrptr;
447
448 if (!ses->auth_key.len || !ses->auth_key.response)
449 return 0;
450
451 blobptr = ses->auth_key.response;
452 blobend = blobptr + ses->auth_key.len;
453
454 while (blobptr + onesize < blobend) {
455 attrptr = (struct ntlmssp2_name *) blobptr;
456 type = le16_to_cpu(attrptr->type);
457 if (type == NTLMSSP_AV_EOL)
458 break;
459 blobptr += 2; /* advance attr type */
460 attrsize = le16_to_cpu(attrptr->length);
461 blobptr += 2; /* advance attr size */
462 if (blobptr + attrsize > blobend)
463 break;
464 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
465 if (!attrsize)
466 break;
467 if (!ses->domainName) {
468 ses->domainName =
469 kmalloc(attrsize + 1, GFP_KERNEL);
470 if (!ses->domainName)
471 return -ENOMEM;
472 cifs_from_ucs2(ses->domainName,
473 (__le16 *)blobptr, attrsize, attrsize,
474 nls_cp, false);
475 break;
476 }
477 }
478 blobptr += attrsize; /* advance attr value */
479 }
480
481 return 0;
482 }
483
484 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
485 const struct nls_table *nls_cp)
486 {
487 int rc = 0;
488 int len;
489 char nt_hash[CIFS_NTHASH_SIZE];
490 wchar_t *user;
491 wchar_t *domain;
492 wchar_t *server;
493
494 if (!ses->server->secmech.sdeschmacmd5) {
495 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
496 return -1;
497 }
498
499 /* calculate md4 hash of password */
500 E_md4hash(ses->password, nt_hash);
501
502 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
503 CIFS_NTHASH_SIZE);
504 if (rc) {
505 cERROR(1, "%s: Could not set NT Hash as a key", __func__);
506 return rc;
507 }
508
509 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
510 if (rc) {
511 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
512 return rc;
513 }
514
515 /* convert ses->user_name to unicode and uppercase */
516 len = strlen(ses->user_name);
517 user = kmalloc(2 + (len * 2), GFP_KERNEL);
518 if (user == NULL) {
519 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
520 rc = -ENOMEM;
521 return rc;
522 }
523 len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
524 UniStrupr(user);
525
526 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
527 (char *)user, 2 * len);
528 kfree(user);
529 if (rc) {
530 cERROR(1, "%s: Could not update with user\n", __func__);
531 return rc;
532 }
533
534 /* convert ses->domainName to unicode and uppercase */
535 if (ses->domainName) {
536 len = strlen(ses->domainName);
537
538 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
539 if (domain == NULL) {
540 cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
541 rc = -ENOMEM;
542 return rc;
543 }
544 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
545 nls_cp);
546 rc =
547 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
548 (char *)domain, 2 * len);
549 kfree(domain);
550 if (rc) {
551 cERROR(1, "%s: Could not update with domain\n",
552 __func__);
553 return rc;
554 }
555 } else if (ses->serverName) {
556 len = strlen(ses->serverName);
557
558 server = kmalloc(2 + (len * 2), GFP_KERNEL);
559 if (server == NULL) {
560 cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
561 rc = -ENOMEM;
562 return rc;
563 }
564 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
565 nls_cp);
566 rc =
567 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
568 (char *)server, 2 * len);
569 kfree(server);
570 if (rc) {
571 cERROR(1, "%s: Could not update with server\n",
572 __func__);
573 return rc;
574 }
575 }
576
577 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
578 ntlmv2_hash);
579 if (rc)
580 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
581
582 return rc;
583 }
584
585 static int
586 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
587 {
588 int rc;
589 unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
590
591 if (!ses->server->secmech.sdeschmacmd5) {
592 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
593 return -1;
594 }
595
596 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
597 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
598 if (rc) {
599 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
600 return rc;
601 }
602
603 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
604 if (rc) {
605 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
606 return rc;
607 }
608
609 if (ses->server->secType == RawNTLMSSP)
610 memcpy(ses->auth_key.response + offset,
611 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
612 else
613 memcpy(ses->auth_key.response + offset,
614 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
615 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
616 ses->auth_key.response + offset, ses->auth_key.len - offset);
617 if (rc) {
618 cERROR(1, "%s: Could not update with response\n", __func__);
619 return rc;
620 }
621
622 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
623 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
624 if (rc)
625 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
626
627 return rc;
628 }
629
630
631 int
632 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
633 {
634 int rc;
635 int baselen;
636 unsigned int tilen;
637 struct ntlmv2_resp *buf;
638 char ntlmv2_hash[16];
639 unsigned char *tiblob = NULL; /* target info blob */
640
641 if (ses->server->secType == RawNTLMSSP) {
642 if (!ses->domainName) {
643 rc = find_domain_name(ses, nls_cp);
644 if (rc) {
645 cERROR(1, "error %d finding domain name", rc);
646 goto setup_ntlmv2_rsp_ret;
647 }
648 }
649 } else {
650 rc = build_avpair_blob(ses, nls_cp);
651 if (rc) {
652 cERROR(1, "error %d building av pair blob", rc);
653 goto setup_ntlmv2_rsp_ret;
654 }
655 }
656
657 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
658 tilen = ses->auth_key.len;
659 tiblob = ses->auth_key.response;
660
661 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
662 if (!ses->auth_key.response) {
663 rc = ENOMEM;
664 ses->auth_key.len = 0;
665 cERROR(1, "%s: Can't allocate auth blob", __func__);
666 goto setup_ntlmv2_rsp_ret;
667 }
668 ses->auth_key.len += baselen;
669
670 buf = (struct ntlmv2_resp *)
671 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
672 buf->blob_signature = cpu_to_le32(0x00000101);
673 buf->reserved = 0;
674 buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
675 get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
676 buf->reserved2 = 0;
677
678 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
679
680 /* calculate ntlmv2_hash */
681 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
682 if (rc) {
683 cERROR(1, "could not get v2 hash rc %d", rc);
684 goto setup_ntlmv2_rsp_ret;
685 }
686
687 /* calculate first part of the client response (CR1) */
688 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
689 if (rc) {
690 cERROR(1, "Could not calculate CR1 rc: %d", rc);
691 goto setup_ntlmv2_rsp_ret;
692 }
693
694 /* now calculate the session key for NTLMv2 */
695 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
696 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
697 if (rc) {
698 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
699 goto setup_ntlmv2_rsp_ret;
700 }
701
702 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
703 if (rc) {
704 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
705 goto setup_ntlmv2_rsp_ret;
706 }
707
708 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
709 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
710 CIFS_HMAC_MD5_HASH_SIZE);
711 if (rc) {
712 cERROR(1, "%s: Could not update with response\n", __func__);
713 goto setup_ntlmv2_rsp_ret;
714 }
715
716 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
717 ses->auth_key.response);
718 if (rc)
719 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
720
721 setup_ntlmv2_rsp_ret:
722 kfree(tiblob);
723
724 return rc;
725 }
726
727 int
728 calc_seckey(struct cifs_ses *ses)
729 {
730 int rc;
731 struct crypto_blkcipher *tfm_arc4;
732 struct scatterlist sgin, sgout;
733 struct blkcipher_desc desc;
734 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
735
736 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
737
738 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
739 if (IS_ERR(tfm_arc4)) {
740 rc = PTR_ERR(tfm_arc4);
741 cERROR(1, "could not allocate crypto API arc4\n");
742 return rc;
743 }
744
745 desc.tfm = tfm_arc4;
746
747 rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
748 CIFS_SESS_KEY_SIZE);
749 if (rc) {
750 cERROR(1, "%s: Could not set response as a key", __func__);
751 return rc;
752 }
753
754 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
755 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
756
757 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
758 if (rc) {
759 cERROR(1, "could not encrypt session key rc: %d\n", rc);
760 crypto_free_blkcipher(tfm_arc4);
761 return rc;
762 }
763
764 /* make secondary_key/nonce as session key */
765 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
766 /* and make len as that of session key only */
767 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
768
769 crypto_free_blkcipher(tfm_arc4);
770
771 return rc;
772 }
773
774 void
775 cifs_crypto_shash_release(struct TCP_Server_Info *server)
776 {
777 if (server->secmech.md5)
778 crypto_free_shash(server->secmech.md5);
779
780 if (server->secmech.hmacmd5)
781 crypto_free_shash(server->secmech.hmacmd5);
782
783 kfree(server->secmech.sdeschmacmd5);
784
785 kfree(server->secmech.sdescmd5);
786 }
787
788 int
789 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
790 {
791 int rc;
792 unsigned int size;
793
794 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
795 if (IS_ERR(server->secmech.hmacmd5)) {
796 cERROR(1, "could not allocate crypto hmacmd5\n");
797 return PTR_ERR(server->secmech.hmacmd5);
798 }
799
800 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
801 if (IS_ERR(server->secmech.md5)) {
802 cERROR(1, "could not allocate crypto md5\n");
803 rc = PTR_ERR(server->secmech.md5);
804 goto crypto_allocate_md5_fail;
805 }
806
807 size = sizeof(struct shash_desc) +
808 crypto_shash_descsize(server->secmech.hmacmd5);
809 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
810 if (!server->secmech.sdeschmacmd5) {
811 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
812 rc = -ENOMEM;
813 goto crypto_allocate_hmacmd5_sdesc_fail;
814 }
815 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
816 server->secmech.sdeschmacmd5->shash.flags = 0x0;
817
818
819 size = sizeof(struct shash_desc) +
820 crypto_shash_descsize(server->secmech.md5);
821 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
822 if (!server->secmech.sdescmd5) {
823 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
824 rc = -ENOMEM;
825 goto crypto_allocate_md5_sdesc_fail;
826 }
827 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
828 server->secmech.sdescmd5->shash.flags = 0x0;
829
830 return 0;
831
832 crypto_allocate_md5_sdesc_fail:
833 kfree(server->secmech.sdeschmacmd5);
834
835 crypto_allocate_hmacmd5_sdesc_fail:
836 crypto_free_shash(server->secmech.md5);
837
838 crypto_allocate_md5_fail:
839 crypto_free_shash(server->secmech.hmacmd5);
840
841 return rc;
842 }
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