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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
69int __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 */
130static 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 */
164int 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
199int 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 */
209int 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
221int 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 */
277int 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
316int 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 */
358static int
359build_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 */
413static int
414find_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 */
465static __le64
466find_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
501static 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
605static int
606CalcNTLMv2_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
658static 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
689int
690setup_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 if (ses->domainAuto) {
703 rc = find_domain_name(ses, nls_cp);
704 if (rc) {
705 cifs_dbg(VFS, "error %d finding domain name\n",
706 rc);
707 goto setup_ntlmv2_rsp_ret;
708 }
709 } else {
710 ses->domainName = kstrdup("", GFP_KERNEL);
711 }
712 }
713 } else {
714 rc = build_avpair_blob(ses, nls_cp);
715 if (rc) {
716 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
717 goto setup_ntlmv2_rsp_ret;
718 }
719 }
720
721 /* Must be within 5 minutes of the server (or in range +/-2h
722 * in case of Mac OS X), so simply carry over server timestamp
723 * (as Windows 7 does)
724 */
725 rsp_timestamp = find_timestamp(ses);
726
727 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
728 tilen = ses->auth_key.len;
729 tiblob = ses->auth_key.response;
730
731 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
732 if (!ses->auth_key.response) {
733 rc = -ENOMEM;
734 ses->auth_key.len = 0;
735 goto setup_ntlmv2_rsp_ret;
736 }
737 ses->auth_key.len += baselen;
738
739 ntlmv2 = (struct ntlmv2_resp *)
740 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
741 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
742 ntlmv2->reserved = 0;
743 ntlmv2->time = rsp_timestamp;
744
745 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
746 ntlmv2->reserved2 = 0;
747
748 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
749
750 mutex_lock(&ses->server->srv_mutex);
751
752 rc = crypto_hmacmd5_alloc(ses->server);
753 if (rc) {
754 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
755 goto unlock;
756 }
757
758 /* calculate ntlmv2_hash */
759 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
760 if (rc) {
761 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
762 goto unlock;
763 }
764
765 /* calculate first part of the client response (CR1) */
766 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
767 if (rc) {
768 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
769 goto unlock;
770 }
771
772 /* now calculate the session key for NTLMv2 */
773 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
774 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
775 if (rc) {
776 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
777 __func__);
778 goto unlock;
779 }
780
781 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
782 if (rc) {
783 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
784 goto unlock;
785 }
786
787 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
788 ntlmv2->ntlmv2_hash,
789 CIFS_HMAC_MD5_HASH_SIZE);
790 if (rc) {
791 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
792 goto unlock;
793 }
794
795 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
796 ses->auth_key.response);
797 if (rc)
798 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
799
800unlock:
801 mutex_unlock(&ses->server->srv_mutex);
802setup_ntlmv2_rsp_ret:
803 kfree(tiblob);
804
805 return rc;
806}
807
808int
809calc_seckey(struct cifs_ses *ses)
810{
811 int rc;
812 struct crypto_skcipher *tfm_arc4;
813 struct scatterlist sgin, sgout;
814 struct skcipher_request *req;
815 unsigned char *sec_key;
816
817 sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL);
818 if (sec_key == NULL)
819 return -ENOMEM;
820
821 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
822
823 tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
824 if (IS_ERR(tfm_arc4)) {
825 rc = PTR_ERR(tfm_arc4);
826 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
827 goto out;
828 }
829
830 rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
831 CIFS_SESS_KEY_SIZE);
832 if (rc) {
833 cifs_dbg(VFS, "%s: Could not set response as a key\n",
834 __func__);
835 goto out_free_cipher;
836 }
837
838 req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
839 if (!req) {
840 rc = -ENOMEM;
841 cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
842 goto out_free_cipher;
843 }
844
845 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
846 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
847
848 skcipher_request_set_callback(req, 0, NULL, NULL);
849 skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
850
851 rc = crypto_skcipher_encrypt(req);
852 skcipher_request_free(req);
853 if (rc) {
854 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
855 goto out_free_cipher;
856 }
857
858 /* make secondary_key/nonce as session key */
859 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
860 /* and make len as that of session key only */
861 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
862
863out_free_cipher:
864 crypto_free_skcipher(tfm_arc4);
865out:
866 kfree(sec_key);
867 return rc;
868}
869
870void
871cifs_crypto_shash_release(struct TCP_Server_Info *server)
872{
873 if (server->secmech.cmacaes) {
874 crypto_free_shash(server->secmech.cmacaes);
875 server->secmech.cmacaes = NULL;
876 }
877
878 if (server->secmech.hmacsha256) {
879 crypto_free_shash(server->secmech.hmacsha256);
880 server->secmech.hmacsha256 = NULL;
881 }
882
883 if (server->secmech.md5) {
884 crypto_free_shash(server->secmech.md5);
885 server->secmech.md5 = NULL;
886 }
887
888 if (server->secmech.hmacmd5) {
889 crypto_free_shash(server->secmech.hmacmd5);
890 server->secmech.hmacmd5 = NULL;
891 }
892
893 kfree(server->secmech.sdesccmacaes);
894 server->secmech.sdesccmacaes = NULL;
895 kfree(server->secmech.sdeschmacsha256);
896 server->secmech.sdeschmacsha256 = NULL;
897 kfree(server->secmech.sdeschmacmd5);
898 server->secmech.sdeschmacmd5 = NULL;
899 kfree(server->secmech.sdescmd5);
900 server->secmech.sdescmd5 = NULL;
901}