Loading...
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_calc_signature(const struct kvec *iov, int n_vec,
41 struct TCP_Server_Info *server, char *signature)
42{
43 int i;
44 int rc;
45
46 if (iov == NULL || signature == NULL || server == NULL)
47 return -EINVAL;
48
49 if (!server->secmech.sdescmd5) {
50 cERROR(1, "%s: Can't generate signature\n", __func__);
51 return -1;
52 }
53
54 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
55 if (rc) {
56 cERROR(1, "%s: Could not init md5\n", __func__);
57 return rc;
58 }
59
60 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
61 server->session_key.response, server->session_key.len);
62 if (rc) {
63 cERROR(1, "%s: Could not update with response\n", __func__);
64 return rc;
65 }
66
67 for (i = 0; i < n_vec; i++) {
68 if (iov[i].iov_len == 0)
69 continue;
70 if (iov[i].iov_base == NULL) {
71 cERROR(1, "null iovec entry");
72 return -EIO;
73 }
74 /* The first entry includes a length field (which does not get
75 signed that occupies the first 4 bytes before the header */
76 if (i == 0) {
77 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
78 break; /* nothing to sign or corrupt header */
79 rc =
80 crypto_shash_update(&server->secmech.sdescmd5->shash,
81 iov[i].iov_base + 4, iov[i].iov_len - 4);
82 } else {
83 rc =
84 crypto_shash_update(&server->secmech.sdescmd5->shash,
85 iov[i].iov_base, iov[i].iov_len);
86 }
87 if (rc) {
88 cERROR(1, "%s: Could not update with payload\n",
89 __func__);
90 return rc;
91 }
92 }
93
94 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
95 if (rc)
96 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
97
98 return rc;
99}
100
101/* must be called with server->srv_mutex held */
102int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
103 __u32 *pexpected_response_sequence_number)
104{
105 int rc = 0;
106 char smb_signature[20];
107 struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
108
109 if ((cifs_pdu == NULL) || (server == NULL))
110 return -EINVAL;
111
112 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
113 server->tcpStatus == CifsNeedNegotiate)
114 return rc;
115
116 if (!server->session_estab) {
117 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
118 return rc;
119 }
120
121 cifs_pdu->Signature.Sequence.SequenceNumber =
122 cpu_to_le32(server->sequence_number);
123 cifs_pdu->Signature.Sequence.Reserved = 0;
124
125 *pexpected_response_sequence_number = server->sequence_number++;
126 server->sequence_number++;
127
128 rc = cifs_calc_signature(iov, n_vec, server, smb_signature);
129 if (rc)
130 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
131 else
132 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
133
134 return rc;
135}
136
137/* must be called with server->srv_mutex held */
138int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
139 __u32 *pexpected_response_sequence_number)
140{
141 struct kvec iov;
142
143 iov.iov_base = cifs_pdu;
144 iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
145
146 return cifs_sign_smb2(&iov, 1, server,
147 pexpected_response_sequence_number);
148}
149
150int cifs_verify_signature(struct kvec *iov, unsigned int nr_iov,
151 struct TCP_Server_Info *server,
152 __u32 expected_sequence_number)
153{
154 unsigned int rc;
155 char server_response_sig[8];
156 char what_we_think_sig_should_be[20];
157 struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
158
159 if (cifs_pdu == NULL || server == NULL)
160 return -EINVAL;
161
162 if (!server->session_estab)
163 return 0;
164
165 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
166 struct smb_com_lock_req *pSMB =
167 (struct smb_com_lock_req *)cifs_pdu;
168 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
169 return 0;
170 }
171
172 /* BB what if signatures are supposed to be on for session but
173 server does not send one? BB */
174
175 /* Do not need to verify session setups with signature "BSRSPYL " */
176 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
177 cFYI(1, "dummy signature received for smb command 0x%x",
178 cifs_pdu->Command);
179
180 /* save off the origiginal signature so we can modify the smb and check
181 its signature against what the server sent */
182 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
183
184 cifs_pdu->Signature.Sequence.SequenceNumber =
185 cpu_to_le32(expected_sequence_number);
186 cifs_pdu->Signature.Sequence.Reserved = 0;
187
188 mutex_lock(&server->srv_mutex);
189 rc = cifs_calc_signature(iov, nr_iov, server,
190 what_we_think_sig_should_be);
191 mutex_unlock(&server->srv_mutex);
192
193 if (rc)
194 return rc;
195
196/* cifs_dump_mem("what we think it should be: ",
197 what_we_think_sig_should_be, 16); */
198
199 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
200 return -EACCES;
201 else
202 return 0;
203
204}
205
206/* first calculate 24 bytes ntlm response and then 16 byte session key */
207int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
208{
209 int rc = 0;
210 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
211 char temp_key[CIFS_SESS_KEY_SIZE];
212
213 if (!ses)
214 return -EINVAL;
215
216 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
217 if (!ses->auth_key.response) {
218 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
219 return -ENOMEM;
220 }
221 ses->auth_key.len = temp_len;
222
223 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
224 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
225 if (rc) {
226 cFYI(1, "%s Can't generate NTLM response, error: %d",
227 __func__, rc);
228 return rc;
229 }
230
231 rc = E_md4hash(ses->password, temp_key, nls_cp);
232 if (rc) {
233 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
234 return rc;
235 }
236
237 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
238 if (rc)
239 cFYI(1, "%s Can't generate NTLM session key, error: %d",
240 __func__, rc);
241
242 return rc;
243}
244
245#ifdef CONFIG_CIFS_WEAK_PW_HASH
246int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
247 char *lnm_session_key)
248{
249 int i;
250 int rc;
251 char password_with_pad[CIFS_ENCPWD_SIZE];
252
253 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
254 if (password)
255 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
256
257 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
258 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
259 memcpy(lnm_session_key, password_with_pad,
260 CIFS_ENCPWD_SIZE);
261 return 0;
262 }
263
264 /* calculate old style session key */
265 /* calling toupper is less broken than repeatedly
266 calling nls_toupper would be since that will never
267 work for UTF8, but neither handles multibyte code pages
268 but the only alternative would be converting to UCS-16 (Unicode)
269 (using a routine something like UniStrupr) then
270 uppercasing and then converting back from Unicode - which
271 would only worth doing it if we knew it were utf8. Basically
272 utf8 and other multibyte codepages each need their own strupper
273 function since a byte at a time will ont work. */
274
275 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
276 password_with_pad[i] = toupper(password_with_pad[i]);
277
278 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
279
280 return rc;
281}
282#endif /* CIFS_WEAK_PW_HASH */
283
284/* Build a proper attribute value/target info pairs blob.
285 * Fill in netbios and dns domain name and workstation name
286 * and client time (total five av pairs and + one end of fields indicator.
287 * Allocate domain name which gets freed when session struct is deallocated.
288 */
289static int
290build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
291{
292 unsigned int dlen;
293 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
294 char *defdmname = "WORKGROUP";
295 unsigned char *blobptr;
296 struct ntlmssp2_name *attrptr;
297
298 if (!ses->domainName) {
299 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
300 if (!ses->domainName)
301 return -ENOMEM;
302 }
303
304 dlen = strlen(ses->domainName);
305
306 /*
307 * The length of this blob is two times the size of a
308 * structure (av pair) which holds name/size
309 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
310 * unicode length of a netbios domain name
311 */
312 ses->auth_key.len = size + 2 * dlen;
313 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
314 if (!ses->auth_key.response) {
315 ses->auth_key.len = 0;
316 cERROR(1, "Challenge target info allocation failure");
317 return -ENOMEM;
318 }
319
320 blobptr = ses->auth_key.response;
321 attrptr = (struct ntlmssp2_name *) blobptr;
322
323 /*
324 * As defined in MS-NTLM 3.3.2, just this av pair field
325 * is sufficient as part of the temp
326 */
327 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
328 attrptr->length = cpu_to_le16(2 * dlen);
329 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
330 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
331
332 return 0;
333}
334
335/* Server has provided av pairs/target info in the type 2 challenge
336 * packet and we have plucked it and stored within smb session.
337 * We parse that blob here to find netbios domain name to be used
338 * as part of ntlmv2 authentication (in Target String), if not already
339 * specified on the command line.
340 * If this function returns without any error but without fetching
341 * domain name, authentication may fail against some server but
342 * may not fail against other (those who are not very particular
343 * about target string i.e. for some, just user name might suffice.
344 */
345static int
346find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
347{
348 unsigned int attrsize;
349 unsigned int type;
350 unsigned int onesize = sizeof(struct ntlmssp2_name);
351 unsigned char *blobptr;
352 unsigned char *blobend;
353 struct ntlmssp2_name *attrptr;
354
355 if (!ses->auth_key.len || !ses->auth_key.response)
356 return 0;
357
358 blobptr = ses->auth_key.response;
359 blobend = blobptr + ses->auth_key.len;
360
361 while (blobptr + onesize < blobend) {
362 attrptr = (struct ntlmssp2_name *) blobptr;
363 type = le16_to_cpu(attrptr->type);
364 if (type == NTLMSSP_AV_EOL)
365 break;
366 blobptr += 2; /* advance attr type */
367 attrsize = le16_to_cpu(attrptr->length);
368 blobptr += 2; /* advance attr size */
369 if (blobptr + attrsize > blobend)
370 break;
371 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
372 if (!attrsize)
373 break;
374 if (!ses->domainName) {
375 ses->domainName =
376 kmalloc(attrsize + 1, GFP_KERNEL);
377 if (!ses->domainName)
378 return -ENOMEM;
379 cifs_from_utf16(ses->domainName,
380 (__le16 *)blobptr, attrsize, attrsize,
381 nls_cp, false);
382 break;
383 }
384 }
385 blobptr += attrsize; /* advance attr value */
386 }
387
388 return 0;
389}
390
391static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
392 const struct nls_table *nls_cp)
393{
394 int rc = 0;
395 int len;
396 char nt_hash[CIFS_NTHASH_SIZE];
397 wchar_t *user;
398 wchar_t *domain;
399 wchar_t *server;
400
401 if (!ses->server->secmech.sdeschmacmd5) {
402 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
403 return -1;
404 }
405
406 /* calculate md4 hash of password */
407 E_md4hash(ses->password, nt_hash, nls_cp);
408
409 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
410 CIFS_NTHASH_SIZE);
411 if (rc) {
412 cERROR(1, "%s: Could not set NT Hash as a key", __func__);
413 return rc;
414 }
415
416 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
417 if (rc) {
418 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
419 return rc;
420 }
421
422 /* convert ses->user_name to unicode and uppercase */
423 len = ses->user_name ? strlen(ses->user_name) : 0;
424 user = kmalloc(2 + (len * 2), GFP_KERNEL);
425 if (user == NULL) {
426 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
427 rc = -ENOMEM;
428 return rc;
429 }
430
431 if (len) {
432 len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp);
433 UniStrupr(user);
434 } else {
435 memset(user, '\0', 2);
436 }
437
438 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
439 (char *)user, 2 * len);
440 kfree(user);
441 if (rc) {
442 cERROR(1, "%s: Could not update with user\n", __func__);
443 return rc;
444 }
445
446 /* convert ses->domainName to unicode and uppercase */
447 if (ses->domainName) {
448 len = strlen(ses->domainName);
449
450 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
451 if (domain == NULL) {
452 cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
453 rc = -ENOMEM;
454 return rc;
455 }
456 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
457 nls_cp);
458 rc =
459 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
460 (char *)domain, 2 * len);
461 kfree(domain);
462 if (rc) {
463 cERROR(1, "%s: Could not update with domain\n",
464 __func__);
465 return rc;
466 }
467 } else if (ses->serverName) {
468 len = strlen(ses->serverName);
469
470 server = kmalloc(2 + (len * 2), GFP_KERNEL);
471 if (server == NULL) {
472 cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
473 rc = -ENOMEM;
474 return rc;
475 }
476 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
477 nls_cp);
478 rc =
479 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
480 (char *)server, 2 * len);
481 kfree(server);
482 if (rc) {
483 cERROR(1, "%s: Could not update with server\n",
484 __func__);
485 return rc;
486 }
487 }
488
489 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
490 ntlmv2_hash);
491 if (rc)
492 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
493
494 return rc;
495}
496
497static int
498CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
499{
500 int rc;
501 unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
502
503 if (!ses->server->secmech.sdeschmacmd5) {
504 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
505 return -1;
506 }
507
508 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
509 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
510 if (rc) {
511 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
512 return rc;
513 }
514
515 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
516 if (rc) {
517 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
518 return rc;
519 }
520
521 if (ses->server->secType == RawNTLMSSP)
522 memcpy(ses->auth_key.response + offset,
523 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
524 else
525 memcpy(ses->auth_key.response + offset,
526 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
527 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
528 ses->auth_key.response + offset, ses->auth_key.len - offset);
529 if (rc) {
530 cERROR(1, "%s: Could not update with response\n", __func__);
531 return rc;
532 }
533
534 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
535 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
536 if (rc)
537 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
538
539 return rc;
540}
541
542
543int
544setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
545{
546 int rc;
547 int baselen;
548 unsigned int tilen;
549 struct ntlmv2_resp *buf;
550 char ntlmv2_hash[16];
551 unsigned char *tiblob = NULL; /* target info blob */
552
553 if (ses->server->secType == RawNTLMSSP) {
554 if (!ses->domainName) {
555 rc = find_domain_name(ses, nls_cp);
556 if (rc) {
557 cERROR(1, "error %d finding domain name", rc);
558 goto setup_ntlmv2_rsp_ret;
559 }
560 }
561 } else {
562 rc = build_avpair_blob(ses, nls_cp);
563 if (rc) {
564 cERROR(1, "error %d building av pair blob", rc);
565 goto setup_ntlmv2_rsp_ret;
566 }
567 }
568
569 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
570 tilen = ses->auth_key.len;
571 tiblob = ses->auth_key.response;
572
573 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
574 if (!ses->auth_key.response) {
575 rc = ENOMEM;
576 ses->auth_key.len = 0;
577 cERROR(1, "%s: Can't allocate auth blob", __func__);
578 goto setup_ntlmv2_rsp_ret;
579 }
580 ses->auth_key.len += baselen;
581
582 buf = (struct ntlmv2_resp *)
583 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
584 buf->blob_signature = cpu_to_le32(0x00000101);
585 buf->reserved = 0;
586 buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
587 get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
588 buf->reserved2 = 0;
589
590 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
591
592 /* calculate ntlmv2_hash */
593 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
594 if (rc) {
595 cERROR(1, "could not get v2 hash rc %d", rc);
596 goto setup_ntlmv2_rsp_ret;
597 }
598
599 /* calculate first part of the client response (CR1) */
600 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
601 if (rc) {
602 cERROR(1, "Could not calculate CR1 rc: %d", rc);
603 goto setup_ntlmv2_rsp_ret;
604 }
605
606 /* now calculate the session key for NTLMv2 */
607 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
608 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
609 if (rc) {
610 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
611 goto setup_ntlmv2_rsp_ret;
612 }
613
614 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
615 if (rc) {
616 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
617 goto setup_ntlmv2_rsp_ret;
618 }
619
620 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
621 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
622 CIFS_HMAC_MD5_HASH_SIZE);
623 if (rc) {
624 cERROR(1, "%s: Could not update with response\n", __func__);
625 goto setup_ntlmv2_rsp_ret;
626 }
627
628 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
629 ses->auth_key.response);
630 if (rc)
631 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
632
633setup_ntlmv2_rsp_ret:
634 kfree(tiblob);
635
636 return rc;
637}
638
639int
640calc_seckey(struct cifs_ses *ses)
641{
642 int rc;
643 struct crypto_blkcipher *tfm_arc4;
644 struct scatterlist sgin, sgout;
645 struct blkcipher_desc desc;
646 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
647
648 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
649
650 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
651 if (IS_ERR(tfm_arc4)) {
652 rc = PTR_ERR(tfm_arc4);
653 cERROR(1, "could not allocate crypto API arc4\n");
654 return rc;
655 }
656
657 desc.tfm = tfm_arc4;
658
659 rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
660 CIFS_SESS_KEY_SIZE);
661 if (rc) {
662 cERROR(1, "%s: Could not set response as a key", __func__);
663 return rc;
664 }
665
666 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
667 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
668
669 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
670 if (rc) {
671 cERROR(1, "could not encrypt session key rc: %d\n", rc);
672 crypto_free_blkcipher(tfm_arc4);
673 return rc;
674 }
675
676 /* make secondary_key/nonce as session key */
677 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
678 /* and make len as that of session key only */
679 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
680
681 crypto_free_blkcipher(tfm_arc4);
682
683 return rc;
684}
685
686void
687cifs_crypto_shash_release(struct TCP_Server_Info *server)
688{
689 if (server->secmech.md5)
690 crypto_free_shash(server->secmech.md5);
691
692 if (server->secmech.hmacmd5)
693 crypto_free_shash(server->secmech.hmacmd5);
694
695 kfree(server->secmech.sdeschmacmd5);
696
697 kfree(server->secmech.sdescmd5);
698}
699
700int
701cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
702{
703 int rc;
704 unsigned int size;
705
706 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
707 if (IS_ERR(server->secmech.hmacmd5)) {
708 cERROR(1, "could not allocate crypto hmacmd5\n");
709 return PTR_ERR(server->secmech.hmacmd5);
710 }
711
712 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
713 if (IS_ERR(server->secmech.md5)) {
714 cERROR(1, "could not allocate crypto md5\n");
715 rc = PTR_ERR(server->secmech.md5);
716 goto crypto_allocate_md5_fail;
717 }
718
719 size = sizeof(struct shash_desc) +
720 crypto_shash_descsize(server->secmech.hmacmd5);
721 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
722 if (!server->secmech.sdeschmacmd5) {
723 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
724 rc = -ENOMEM;
725 goto crypto_allocate_hmacmd5_sdesc_fail;
726 }
727 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
728 server->secmech.sdeschmacmd5->shash.flags = 0x0;
729
730
731 size = sizeof(struct shash_desc) +
732 crypto_shash_descsize(server->secmech.md5);
733 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
734 if (!server->secmech.sdescmd5) {
735 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
736 rc = -ENOMEM;
737 goto crypto_allocate_md5_sdesc_fail;
738 }
739 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
740 server->secmech.sdescmd5->shash.flags = 0x0;
741
742 return 0;
743
744crypto_allocate_md5_sdesc_fail:
745 kfree(server->secmech.sdeschmacmd5);
746
747crypto_allocate_hmacmd5_sdesc_fail:
748 crypto_free_shash(server->secmech.md5);
749
750crypto_allocate_md5_fail:
751 crypto_free_shash(server->secmech.hmacmd5);
752
753 return rc;
754}
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
38static int
39cifs_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/*
70 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
71 * The 16 byte signature must be allocated by the caller. Note we only use the
72 * 1st eight bytes and that the smb header signature field on input contains
73 * the sequence number before this function is called. Also, this function
74 * should be called with the server->srv_mutex held.
75 */
76static int cifs_calc_signature(struct smb_rqst *rqst,
77 struct TCP_Server_Info *server, char *signature)
78{
79 int i;
80 int rc;
81 struct kvec *iov = rqst->rq_iov;
82 int n_vec = rqst->rq_nvec;
83
84 if (iov == NULL || signature == NULL || server == NULL)
85 return -EINVAL;
86
87 if (!server->secmech.sdescmd5) {
88 rc = cifs_crypto_shash_md5_allocate(server);
89 if (rc) {
90 cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
91 return -1;
92 }
93 }
94
95 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
96 if (rc) {
97 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
98 return rc;
99 }
100
101 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
102 server->session_key.response, server->session_key.len);
103 if (rc) {
104 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
105 return rc;
106 }
107
108 for (i = 0; i < n_vec; i++) {
109 if (iov[i].iov_len == 0)
110 continue;
111 if (iov[i].iov_base == NULL) {
112 cifs_dbg(VFS, "null iovec entry\n");
113 return -EIO;
114 }
115 /* The first entry includes a length field (which does not get
116 signed that occupies the first 4 bytes before the header */
117 if (i == 0) {
118 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
119 break; /* nothing to sign or corrupt header */
120 rc =
121 crypto_shash_update(&server->secmech.sdescmd5->shash,
122 iov[i].iov_base + 4, iov[i].iov_len - 4);
123 } else {
124 rc =
125 crypto_shash_update(&server->secmech.sdescmd5->shash,
126 iov[i].iov_base, iov[i].iov_len);
127 }
128 if (rc) {
129 cifs_dbg(VFS, "%s: Could not update with payload\n",
130 __func__);
131 return rc;
132 }
133 }
134
135 /* now hash over the rq_pages array */
136 for (i = 0; i < rqst->rq_npages; i++) {
137 struct kvec p_iov;
138
139 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
140 crypto_shash_update(&server->secmech.sdescmd5->shash,
141 p_iov.iov_base, p_iov.iov_len);
142 kunmap(rqst->rq_pages[i]);
143 }
144
145 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
146 if (rc)
147 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
148
149 return rc;
150}
151
152/* must be called with server->srv_mutex held */
153int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
154 __u32 *pexpected_response_sequence_number)
155{
156 int rc = 0;
157 char smb_signature[20];
158 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
159
160 if ((cifs_pdu == NULL) || (server == NULL))
161 return -EINVAL;
162
163 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
164 server->tcpStatus == CifsNeedNegotiate)
165 return rc;
166
167 if (!server->session_estab) {
168 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
169 return rc;
170 }
171
172 cifs_pdu->Signature.Sequence.SequenceNumber =
173 cpu_to_le32(server->sequence_number);
174 cifs_pdu->Signature.Sequence.Reserved = 0;
175
176 *pexpected_response_sequence_number = ++server->sequence_number;
177 ++server->sequence_number;
178
179 rc = cifs_calc_signature(rqst, server, smb_signature);
180 if (rc)
181 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
182 else
183 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
184
185 return rc;
186}
187
188int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
189 __u32 *pexpected_response_sequence)
190{
191 struct smb_rqst rqst = { .rq_iov = iov,
192 .rq_nvec = n_vec };
193
194 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
195}
196
197/* must be called with server->srv_mutex held */
198int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
199 __u32 *pexpected_response_sequence_number)
200{
201 struct kvec iov;
202
203 iov.iov_base = cifs_pdu;
204 iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
205
206 return cifs_sign_smbv(&iov, 1, server,
207 pexpected_response_sequence_number);
208}
209
210int cifs_verify_signature(struct smb_rqst *rqst,
211 struct TCP_Server_Info *server,
212 __u32 expected_sequence_number)
213{
214 unsigned int rc;
215 char server_response_sig[8];
216 char what_we_think_sig_should_be[20];
217 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
218
219 if (cifs_pdu == NULL || server == NULL)
220 return -EINVAL;
221
222 if (!server->session_estab)
223 return 0;
224
225 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
226 struct smb_com_lock_req *pSMB =
227 (struct smb_com_lock_req *)cifs_pdu;
228 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
229 return 0;
230 }
231
232 /* BB what if signatures are supposed to be on for session but
233 server does not send one? BB */
234
235 /* Do not need to verify session setups with signature "BSRSPYL " */
236 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
237 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
238 cifs_pdu->Command);
239
240 /* save off the origiginal signature so we can modify the smb and check
241 its signature against what the server sent */
242 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
243
244 cifs_pdu->Signature.Sequence.SequenceNumber =
245 cpu_to_le32(expected_sequence_number);
246 cifs_pdu->Signature.Sequence.Reserved = 0;
247
248 mutex_lock(&server->srv_mutex);
249 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
250 mutex_unlock(&server->srv_mutex);
251
252 if (rc)
253 return rc;
254
255/* cifs_dump_mem("what we think it should be: ",
256 what_we_think_sig_should_be, 16); */
257
258 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
259 return -EACCES;
260 else
261 return 0;
262
263}
264
265/* first calculate 24 bytes ntlm response and then 16 byte session key */
266int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
267{
268 int rc = 0;
269 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
270 char temp_key[CIFS_SESS_KEY_SIZE];
271
272 if (!ses)
273 return -EINVAL;
274
275 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
276 if (!ses->auth_key.response)
277 return -ENOMEM;
278
279 ses->auth_key.len = temp_len;
280
281 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
282 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
283 if (rc) {
284 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
285 __func__, rc);
286 return rc;
287 }
288
289 rc = E_md4hash(ses->password, temp_key, nls_cp);
290 if (rc) {
291 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
292 __func__, rc);
293 return rc;
294 }
295
296 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
297 if (rc)
298 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
299 __func__, rc);
300
301 return rc;
302}
303
304#ifdef CONFIG_CIFS_WEAK_PW_HASH
305int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
306 char *lnm_session_key)
307{
308 int i;
309 int rc;
310 char password_with_pad[CIFS_ENCPWD_SIZE];
311
312 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
313 if (password)
314 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
315
316 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
317 memcpy(lnm_session_key, password_with_pad,
318 CIFS_ENCPWD_SIZE);
319 return 0;
320 }
321
322 /* calculate old style session key */
323 /* calling toupper is less broken than repeatedly
324 calling nls_toupper would be since that will never
325 work for UTF8, but neither handles multibyte code pages
326 but the only alternative would be converting to UCS-16 (Unicode)
327 (using a routine something like UniStrupr) then
328 uppercasing and then converting back from Unicode - which
329 would only worth doing it if we knew it were utf8. Basically
330 utf8 and other multibyte codepages each need their own strupper
331 function since a byte at a time will ont work. */
332
333 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
334 password_with_pad[i] = toupper(password_with_pad[i]);
335
336 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
337
338 return rc;
339}
340#endif /* CIFS_WEAK_PW_HASH */
341
342/* Build a proper attribute value/target info pairs blob.
343 * Fill in netbios and dns domain name and workstation name
344 * and client time (total five av pairs and + one end of fields indicator.
345 * Allocate domain name which gets freed when session struct is deallocated.
346 */
347static int
348build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
349{
350 unsigned int dlen;
351 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
352 char *defdmname = "WORKGROUP";
353 unsigned char *blobptr;
354 struct ntlmssp2_name *attrptr;
355
356 if (!ses->domainName) {
357 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
358 if (!ses->domainName)
359 return -ENOMEM;
360 }
361
362 dlen = strlen(ses->domainName);
363
364 /*
365 * The length of this blob is two times the size of a
366 * structure (av pair) which holds name/size
367 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
368 * unicode length of a netbios domain name
369 */
370 ses->auth_key.len = size + 2 * dlen;
371 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
372 if (!ses->auth_key.response) {
373 ses->auth_key.len = 0;
374 return -ENOMEM;
375 }
376
377 blobptr = ses->auth_key.response;
378 attrptr = (struct ntlmssp2_name *) blobptr;
379
380 /*
381 * As defined in MS-NTLM 3.3.2, just this av pair field
382 * is sufficient as part of the temp
383 */
384 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
385 attrptr->length = cpu_to_le16(2 * dlen);
386 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
387 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
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 || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
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_utf16(ses->domainName,
437 (__le16 *)blobptr, attrsize, attrsize,
438 nls_cp, NO_MAP_UNI_RSVD);
439 break;
440 }
441 }
442 blobptr += attrsize; /* advance attr value */
443 }
444
445 return 0;
446}
447
448/* Server has provided av pairs/target info in the type 2 challenge
449 * packet and we have plucked it and stored within smb session.
450 * We parse that blob here to find the server given timestamp
451 * as part of ntlmv2 authentication (or local current time as
452 * default in case of failure)
453 */
454static __le64
455find_timestamp(struct cifs_ses *ses)
456{
457 unsigned int attrsize;
458 unsigned int type;
459 unsigned int onesize = sizeof(struct ntlmssp2_name);
460 unsigned char *blobptr;
461 unsigned char *blobend;
462 struct ntlmssp2_name *attrptr;
463
464 if (!ses->auth_key.len || !ses->auth_key.response)
465 return 0;
466
467 blobptr = ses->auth_key.response;
468 blobend = blobptr + ses->auth_key.len;
469
470 while (blobptr + onesize < blobend) {
471 attrptr = (struct ntlmssp2_name *) blobptr;
472 type = le16_to_cpu(attrptr->type);
473 if (type == NTLMSSP_AV_EOL)
474 break;
475 blobptr += 2; /* advance attr type */
476 attrsize = le16_to_cpu(attrptr->length);
477 blobptr += 2; /* advance attr size */
478 if (blobptr + attrsize > blobend)
479 break;
480 if (type == NTLMSSP_AV_TIMESTAMP) {
481 if (attrsize == sizeof(u64))
482 return *((__le64 *)blobptr);
483 }
484 blobptr += attrsize; /* advance attr value */
485 }
486
487 return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
488}
489
490static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
491 const struct nls_table *nls_cp)
492{
493 int rc = 0;
494 int len;
495 char nt_hash[CIFS_NTHASH_SIZE];
496 __le16 *user;
497 wchar_t *domain;
498 wchar_t *server;
499
500 if (!ses->server->secmech.sdeschmacmd5) {
501 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
502 return -1;
503 }
504
505 /* calculate md4 hash of password */
506 E_md4hash(ses->password, nt_hash, nls_cp);
507
508 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
509 CIFS_NTHASH_SIZE);
510 if (rc) {
511 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
512 return rc;
513 }
514
515 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
516 if (rc) {
517 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
518 return rc;
519 }
520
521 /* convert ses->user_name to unicode */
522 len = ses->user_name ? strlen(ses->user_name) : 0;
523 user = kmalloc(2 + (len * 2), GFP_KERNEL);
524 if (user == NULL) {
525 rc = -ENOMEM;
526 return rc;
527 }
528
529 if (len) {
530 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
531 UniStrupr(user);
532 } else {
533 memset(user, '\0', 2);
534 }
535
536 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
537 (char *)user, 2 * len);
538 kfree(user);
539 if (rc) {
540 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
541 return rc;
542 }
543
544 /* convert ses->domainName to unicode and uppercase */
545 if (ses->domainName) {
546 len = strlen(ses->domainName);
547
548 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
549 if (domain == NULL) {
550 rc = -ENOMEM;
551 return rc;
552 }
553 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
554 nls_cp);
555 rc =
556 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
557 (char *)domain, 2 * len);
558 kfree(domain);
559 if (rc) {
560 cifs_dbg(VFS, "%s: Could not update with domain\n",
561 __func__);
562 return rc;
563 }
564 } else {
565 /* We use ses->serverName if no domain name available */
566 len = strlen(ses->serverName);
567
568 server = kmalloc(2 + (len * 2), GFP_KERNEL);
569 if (server == NULL) {
570 rc = -ENOMEM;
571 return rc;
572 }
573 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
574 nls_cp);
575 rc =
576 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
577 (char *)server, 2 * len);
578 kfree(server);
579 if (rc) {
580 cifs_dbg(VFS, "%s: Could not update with server\n",
581 __func__);
582 return rc;
583 }
584 }
585
586 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
587 ntlmv2_hash);
588 if (rc)
589 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
590
591 return rc;
592}
593
594static int
595CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
596{
597 int rc;
598 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
599 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
600 unsigned int hash_len;
601
602 /* The MD5 hash starts at challenge_key.key */
603 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
604 offsetof(struct ntlmv2_resp, challenge.key[0]));
605
606 if (!ses->server->secmech.sdeschmacmd5) {
607 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
608 return -1;
609 }
610
611 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
612 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
613 if (rc) {
614 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
615 __func__);
616 return rc;
617 }
618
619 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
620 if (rc) {
621 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
622 return rc;
623 }
624
625 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
626 memcpy(ntlmv2->challenge.key,
627 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
628 else
629 memcpy(ntlmv2->challenge.key,
630 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
631 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
632 ntlmv2->challenge.key, hash_len);
633 if (rc) {
634 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
635 return rc;
636 }
637
638 /* Note that the MD5 digest over writes anon.challenge_key.key */
639 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
640 ntlmv2->ntlmv2_hash);
641 if (rc)
642 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
643
644 return rc;
645}
646
647static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
648{
649 int rc;
650 unsigned int size;
651
652 /* check if already allocated */
653 if (server->secmech.sdeschmacmd5)
654 return 0;
655
656 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
657 if (IS_ERR(server->secmech.hmacmd5)) {
658 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
659 rc = PTR_ERR(server->secmech.hmacmd5);
660 server->secmech.hmacmd5 = NULL;
661 return rc;
662 }
663
664 size = sizeof(struct shash_desc) +
665 crypto_shash_descsize(server->secmech.hmacmd5);
666 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
667 if (!server->secmech.sdeschmacmd5) {
668 crypto_free_shash(server->secmech.hmacmd5);
669 server->secmech.hmacmd5 = NULL;
670 return -ENOMEM;
671 }
672 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
673 server->secmech.sdeschmacmd5->shash.flags = 0x0;
674
675 return 0;
676}
677
678int
679setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
680{
681 int rc;
682 int baselen;
683 unsigned int tilen;
684 struct ntlmv2_resp *ntlmv2;
685 char ntlmv2_hash[16];
686 unsigned char *tiblob = NULL; /* target info blob */
687 __le64 rsp_timestamp;
688
689 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
690 if (!ses->domainName) {
691 rc = find_domain_name(ses, nls_cp);
692 if (rc) {
693 cifs_dbg(VFS, "error %d finding domain name\n",
694 rc);
695 goto setup_ntlmv2_rsp_ret;
696 }
697 }
698 } else {
699 rc = build_avpair_blob(ses, nls_cp);
700 if (rc) {
701 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
702 goto setup_ntlmv2_rsp_ret;
703 }
704 }
705
706 /* Must be within 5 minutes of the server (or in range +/-2h
707 * in case of Mac OS X), so simply carry over server timestamp
708 * (as Windows 7 does)
709 */
710 rsp_timestamp = find_timestamp(ses);
711
712 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
713 tilen = ses->auth_key.len;
714 tiblob = ses->auth_key.response;
715
716 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
717 if (!ses->auth_key.response) {
718 rc = -ENOMEM;
719 ses->auth_key.len = 0;
720 goto setup_ntlmv2_rsp_ret;
721 }
722 ses->auth_key.len += baselen;
723
724 ntlmv2 = (struct ntlmv2_resp *)
725 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
726 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
727 ntlmv2->reserved = 0;
728 ntlmv2->time = rsp_timestamp;
729
730 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
731 ntlmv2->reserved2 = 0;
732
733 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
734
735 rc = crypto_hmacmd5_alloc(ses->server);
736 if (rc) {
737 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
738 goto setup_ntlmv2_rsp_ret;
739 }
740
741 /* calculate ntlmv2_hash */
742 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
743 if (rc) {
744 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
745 goto setup_ntlmv2_rsp_ret;
746 }
747
748 /* calculate first part of the client response (CR1) */
749 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
750 if (rc) {
751 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
752 goto setup_ntlmv2_rsp_ret;
753 }
754
755 /* now calculate the session key for NTLMv2 */
756 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
757 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
758 if (rc) {
759 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
760 __func__);
761 goto setup_ntlmv2_rsp_ret;
762 }
763
764 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
765 if (rc) {
766 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
767 goto setup_ntlmv2_rsp_ret;
768 }
769
770 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
771 ntlmv2->ntlmv2_hash,
772 CIFS_HMAC_MD5_HASH_SIZE);
773 if (rc) {
774 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
775 goto setup_ntlmv2_rsp_ret;
776 }
777
778 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
779 ses->auth_key.response);
780 if (rc)
781 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
782
783setup_ntlmv2_rsp_ret:
784 kfree(tiblob);
785
786 return rc;
787}
788
789int
790calc_seckey(struct cifs_ses *ses)
791{
792 int rc;
793 struct crypto_skcipher *tfm_arc4;
794 struct scatterlist sgin, sgout;
795 struct skcipher_request *req;
796 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
797
798 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
799
800 tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
801 if (IS_ERR(tfm_arc4)) {
802 rc = PTR_ERR(tfm_arc4);
803 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
804 return rc;
805 }
806
807 rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
808 CIFS_SESS_KEY_SIZE);
809 if (rc) {
810 cifs_dbg(VFS, "%s: Could not set response as a key\n",
811 __func__);
812 goto out_free_cipher;
813 }
814
815 req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
816 if (!req) {
817 rc = -ENOMEM;
818 cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
819 goto out_free_cipher;
820 }
821
822 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
823 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
824
825 skcipher_request_set_callback(req, 0, NULL, NULL);
826 skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
827
828 rc = crypto_skcipher_encrypt(req);
829 skcipher_request_free(req);
830 if (rc) {
831 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
832 goto out_free_cipher;
833 }
834
835 /* make secondary_key/nonce as session key */
836 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
837 /* and make len as that of session key only */
838 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
839
840out_free_cipher:
841 crypto_free_skcipher(tfm_arc4);
842
843 return rc;
844}
845
846void
847cifs_crypto_shash_release(struct TCP_Server_Info *server)
848{
849 if (server->secmech.cmacaes) {
850 crypto_free_shash(server->secmech.cmacaes);
851 server->secmech.cmacaes = NULL;
852 }
853
854 if (server->secmech.hmacsha256) {
855 crypto_free_shash(server->secmech.hmacsha256);
856 server->secmech.hmacsha256 = NULL;
857 }
858
859 if (server->secmech.md5) {
860 crypto_free_shash(server->secmech.md5);
861 server->secmech.md5 = NULL;
862 }
863
864 if (server->secmech.hmacmd5) {
865 crypto_free_shash(server->secmech.hmacmd5);
866 server->secmech.hmacmd5 = NULL;
867 }
868
869 kfree(server->secmech.sdesccmacaes);
870 server->secmech.sdesccmacaes = NULL;
871 kfree(server->secmech.sdeschmacsha256);
872 server->secmech.sdeschmacsha256 = NULL;
873 kfree(server->secmech.sdeschmacmd5);
874 server->secmech.sdeschmacmd5 = NULL;
875 kfree(server->secmech.sdescmd5);
876 server->secmech.sdescmd5 = NULL;
877}