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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 * Copyright (C) International Business Machines Corp., 2005,2013
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#include <linux/highmem.h>
33
34static int
35cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
36{
37 int rc;
38 unsigned int size;
39
40 if (server->secmech.sdescmd5 != NULL)
41 return 0; /* already allocated */
42
43 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
44 if (IS_ERR(server->secmech.md5)) {
45 cifs_dbg(VFS, "could not allocate crypto md5\n");
46 rc = PTR_ERR(server->secmech.md5);
47 server->secmech.md5 = NULL;
48 return rc;
49 }
50
51 size = sizeof(struct shash_desc) +
52 crypto_shash_descsize(server->secmech.md5);
53 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
54 if (!server->secmech.sdescmd5) {
55 crypto_free_shash(server->secmech.md5);
56 server->secmech.md5 = NULL;
57 return -ENOMEM;
58 }
59 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
60 server->secmech.sdescmd5->shash.flags = 0x0;
61
62 return 0;
63}
64
65/*
66 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
67 * The 16 byte signature must be allocated by the caller. Note we only use the
68 * 1st eight bytes and that the smb header signature field on input contains
69 * the sequence number before this function is called. Also, this function
70 * should be called with the server->srv_mutex held.
71 */
72static int cifs_calc_signature(struct smb_rqst *rqst,
73 struct TCP_Server_Info *server, char *signature)
74{
75 int i;
76 int rc;
77 struct kvec *iov = rqst->rq_iov;
78 int n_vec = rqst->rq_nvec;
79
80 if (iov == NULL || signature == NULL || server == NULL)
81 return -EINVAL;
82
83 if (!server->secmech.sdescmd5) {
84 rc = cifs_crypto_shash_md5_allocate(server);
85 if (rc) {
86 cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
87 return -1;
88 }
89 }
90
91 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
92 if (rc) {
93 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
94 return rc;
95 }
96
97 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
98 server->session_key.response, server->session_key.len);
99 if (rc) {
100 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
101 return rc;
102 }
103
104 for (i = 0; i < n_vec; i++) {
105 if (iov[i].iov_len == 0)
106 continue;
107 if (iov[i].iov_base == NULL) {
108 cifs_dbg(VFS, "null iovec entry\n");
109 return -EIO;
110 }
111 /* The first entry includes a length field (which does not get
112 signed that occupies the first 4 bytes before the header */
113 if (i == 0) {
114 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
115 break; /* nothing to sign or corrupt header */
116 rc =
117 crypto_shash_update(&server->secmech.sdescmd5->shash,
118 iov[i].iov_base + 4, iov[i].iov_len - 4);
119 } else {
120 rc =
121 crypto_shash_update(&server->secmech.sdescmd5->shash,
122 iov[i].iov_base, iov[i].iov_len);
123 }
124 if (rc) {
125 cifs_dbg(VFS, "%s: Could not update with payload\n",
126 __func__);
127 return rc;
128 }
129 }
130
131 /* now hash over the rq_pages array */
132 for (i = 0; i < rqst->rq_npages; i++) {
133 struct kvec p_iov;
134
135 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
136 crypto_shash_update(&server->secmech.sdescmd5->shash,
137 p_iov.iov_base, p_iov.iov_len);
138 kunmap(rqst->rq_pages[i]);
139 }
140
141 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
142 if (rc)
143 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
144
145 return rc;
146}
147
148/* must be called with server->srv_mutex held */
149int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
150 __u32 *pexpected_response_sequence_number)
151{
152 int rc = 0;
153 char smb_signature[20];
154 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
155
156 if ((cifs_pdu == NULL) || (server == NULL))
157 return -EINVAL;
158
159 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
160 server->tcpStatus == CifsNeedNegotiate)
161 return rc;
162
163 if (!server->session_estab) {
164 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
165 return rc;
166 }
167
168 cifs_pdu->Signature.Sequence.SequenceNumber =
169 cpu_to_le32(server->sequence_number);
170 cifs_pdu->Signature.Sequence.Reserved = 0;
171
172 *pexpected_response_sequence_number = ++server->sequence_number;
173 ++server->sequence_number;
174
175 rc = cifs_calc_signature(rqst, server, smb_signature);
176 if (rc)
177 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
178 else
179 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
180
181 return rc;
182}
183
184int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
185 __u32 *pexpected_response_sequence)
186{
187 struct smb_rqst rqst = { .rq_iov = iov,
188 .rq_nvec = n_vec };
189
190 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
191}
192
193/* must be called with server->srv_mutex held */
194int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
195 __u32 *pexpected_response_sequence_number)
196{
197 struct kvec iov;
198
199 iov.iov_base = cifs_pdu;
200 iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
201
202 return cifs_sign_smbv(&iov, 1, server,
203 pexpected_response_sequence_number);
204}
205
206int cifs_verify_signature(struct smb_rqst *rqst,
207 struct TCP_Server_Info *server,
208 __u32 expected_sequence_number)
209{
210 unsigned int rc;
211 char server_response_sig[8];
212 char what_we_think_sig_should_be[20];
213 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
214
215 if (cifs_pdu == NULL || server == NULL)
216 return -EINVAL;
217
218 if (!server->session_estab)
219 return 0;
220
221 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
222 struct smb_com_lock_req *pSMB =
223 (struct smb_com_lock_req *)cifs_pdu;
224 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
225 return 0;
226 }
227
228 /* BB what if signatures are supposed to be on for session but
229 server does not send one? BB */
230
231 /* Do not need to verify session setups with signature "BSRSPYL " */
232 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
233 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
234 cifs_pdu->Command);
235
236 /* save off the origiginal signature so we can modify the smb and check
237 its signature against what the server sent */
238 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
239
240 cifs_pdu->Signature.Sequence.SequenceNumber =
241 cpu_to_le32(expected_sequence_number);
242 cifs_pdu->Signature.Sequence.Reserved = 0;
243
244 mutex_lock(&server->srv_mutex);
245 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
246 mutex_unlock(&server->srv_mutex);
247
248 if (rc)
249 return rc;
250
251/* cifs_dump_mem("what we think it should be: ",
252 what_we_think_sig_should_be, 16); */
253
254 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
255 return -EACCES;
256 else
257 return 0;
258
259}
260
261/* first calculate 24 bytes ntlm response and then 16 byte session key */
262int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
263{
264 int rc = 0;
265 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
266 char temp_key[CIFS_SESS_KEY_SIZE];
267
268 if (!ses)
269 return -EINVAL;
270
271 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
272 if (!ses->auth_key.response)
273 return -ENOMEM;
274
275 ses->auth_key.len = temp_len;
276
277 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
278 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
279 if (rc) {
280 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
281 __func__, rc);
282 return rc;
283 }
284
285 rc = E_md4hash(ses->password, temp_key, nls_cp);
286 if (rc) {
287 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
288 __func__, rc);
289 return rc;
290 }
291
292 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
293 if (rc)
294 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
295 __func__, rc);
296
297 return rc;
298}
299
300#ifdef CONFIG_CIFS_WEAK_PW_HASH
301int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
302 char *lnm_session_key)
303{
304 int i;
305 int rc;
306 char password_with_pad[CIFS_ENCPWD_SIZE];
307
308 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
309 if (password)
310 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
311
312 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
313 memcpy(lnm_session_key, password_with_pad,
314 CIFS_ENCPWD_SIZE);
315 return 0;
316 }
317
318 /* calculate old style session key */
319 /* calling toupper is less broken than repeatedly
320 calling nls_toupper would be since that will never
321 work for UTF8, but neither handles multibyte code pages
322 but the only alternative would be converting to UCS-16 (Unicode)
323 (using a routine something like UniStrupr) then
324 uppercasing and then converting back from Unicode - which
325 would only worth doing it if we knew it were utf8. Basically
326 utf8 and other multibyte codepages each need their own strupper
327 function since a byte at a time will ont work. */
328
329 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
330 password_with_pad[i] = toupper(password_with_pad[i]);
331
332 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
333
334 return rc;
335}
336#endif /* CIFS_WEAK_PW_HASH */
337
338/* Build a proper attribute value/target info pairs blob.
339 * Fill in netbios and dns domain name and workstation name
340 * and client time (total five av pairs and + one end of fields indicator.
341 * Allocate domain name which gets freed when session struct is deallocated.
342 */
343static int
344build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
345{
346 unsigned int dlen;
347 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
348 char *defdmname = "WORKGROUP";
349 unsigned char *blobptr;
350 struct ntlmssp2_name *attrptr;
351
352 if (!ses->domainName) {
353 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
354 if (!ses->domainName)
355 return -ENOMEM;
356 }
357
358 dlen = strlen(ses->domainName);
359
360 /*
361 * The length of this blob is two times the size of a
362 * structure (av pair) which holds name/size
363 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
364 * unicode length of a netbios domain name
365 */
366 ses->auth_key.len = size + 2 * dlen;
367 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
368 if (!ses->auth_key.response) {
369 ses->auth_key.len = 0;
370 return -ENOMEM;
371 }
372
373 blobptr = ses->auth_key.response;
374 attrptr = (struct ntlmssp2_name *) blobptr;
375
376 /*
377 * As defined in MS-NTLM 3.3.2, just this av pair field
378 * is sufficient as part of the temp
379 */
380 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
381 attrptr->length = cpu_to_le16(2 * dlen);
382 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
383 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
384
385 return 0;
386}
387
388/* Server has provided av pairs/target info in the type 2 challenge
389 * packet and we have plucked it and stored within smb session.
390 * We parse that blob here to find netbios domain name to be used
391 * as part of ntlmv2 authentication (in Target String), if not already
392 * specified on the command line.
393 * If this function returns without any error but without fetching
394 * domain name, authentication may fail against some server but
395 * may not fail against other (those who are not very particular
396 * about target string i.e. for some, just user name might suffice.
397 */
398static int
399find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
400{
401 unsigned int attrsize;
402 unsigned int type;
403 unsigned int onesize = sizeof(struct ntlmssp2_name);
404 unsigned char *blobptr;
405 unsigned char *blobend;
406 struct ntlmssp2_name *attrptr;
407
408 if (!ses->auth_key.len || !ses->auth_key.response)
409 return 0;
410
411 blobptr = ses->auth_key.response;
412 blobend = blobptr + ses->auth_key.len;
413
414 while (blobptr + onesize < blobend) {
415 attrptr = (struct ntlmssp2_name *) blobptr;
416 type = le16_to_cpu(attrptr->type);
417 if (type == NTLMSSP_AV_EOL)
418 break;
419 blobptr += 2; /* advance attr type */
420 attrsize = le16_to_cpu(attrptr->length);
421 blobptr += 2; /* advance attr size */
422 if (blobptr + attrsize > blobend)
423 break;
424 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
425 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
426 break;
427 if (!ses->domainName) {
428 ses->domainName =
429 kmalloc(attrsize + 1, GFP_KERNEL);
430 if (!ses->domainName)
431 return -ENOMEM;
432 cifs_from_utf16(ses->domainName,
433 (__le16 *)blobptr, attrsize, attrsize,
434 nls_cp, false);
435 break;
436 }
437 }
438 blobptr += attrsize; /* advance attr value */
439 }
440
441 return 0;
442}
443
444static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
445 const struct nls_table *nls_cp)
446{
447 int rc = 0;
448 int len;
449 char nt_hash[CIFS_NTHASH_SIZE];
450 __le16 *user;
451 wchar_t *domain;
452 wchar_t *server;
453
454 if (!ses->server->secmech.sdeschmacmd5) {
455 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
456 return -1;
457 }
458
459 /* calculate md4 hash of password */
460 E_md4hash(ses->password, nt_hash, nls_cp);
461
462 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
463 CIFS_NTHASH_SIZE);
464 if (rc) {
465 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
466 return rc;
467 }
468
469 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
470 if (rc) {
471 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
472 return rc;
473 }
474
475 /* convert ses->user_name to unicode */
476 len = ses->user_name ? strlen(ses->user_name) : 0;
477 user = kmalloc(2 + (len * 2), GFP_KERNEL);
478 if (user == NULL) {
479 rc = -ENOMEM;
480 return rc;
481 }
482
483 if (len) {
484 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
485 UniStrupr(user);
486 } else {
487 memset(user, '\0', 2);
488 }
489
490 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
491 (char *)user, 2 * len);
492 kfree(user);
493 if (rc) {
494 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
495 return rc;
496 }
497
498 /* convert ses->domainName to unicode and uppercase */
499 if (ses->domainName) {
500 len = strlen(ses->domainName);
501
502 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
503 if (domain == NULL) {
504 rc = -ENOMEM;
505 return rc;
506 }
507 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
508 nls_cp);
509 rc =
510 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
511 (char *)domain, 2 * len);
512 kfree(domain);
513 if (rc) {
514 cifs_dbg(VFS, "%s: Could not update with domain\n",
515 __func__);
516 return rc;
517 }
518 } else if (ses->serverName) {
519 len = strlen(ses->serverName);
520
521 server = kmalloc(2 + (len * 2), GFP_KERNEL);
522 if (server == NULL) {
523 rc = -ENOMEM;
524 return rc;
525 }
526 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
527 nls_cp);
528 rc =
529 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
530 (char *)server, 2 * len);
531 kfree(server);
532 if (rc) {
533 cifs_dbg(VFS, "%s: Could not update with server\n",
534 __func__);
535 return rc;
536 }
537 }
538
539 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
540 ntlmv2_hash);
541 if (rc)
542 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
543
544 return rc;
545}
546
547static int
548CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
549{
550 int rc;
551 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
552 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
553 unsigned int hash_len;
554
555 /* The MD5 hash starts at challenge_key.key */
556 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
557 offsetof(struct ntlmv2_resp, challenge.key[0]));
558
559 if (!ses->server->secmech.sdeschmacmd5) {
560 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
561 return -1;
562 }
563
564 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
565 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
566 if (rc) {
567 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
568 __func__);
569 return rc;
570 }
571
572 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
573 if (rc) {
574 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
575 return rc;
576 }
577
578 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
579 memcpy(ntlmv2->challenge.key,
580 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
581 else
582 memcpy(ntlmv2->challenge.key,
583 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
584 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
585 ntlmv2->challenge.key, hash_len);
586 if (rc) {
587 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
588 return rc;
589 }
590
591 /* Note that the MD5 digest over writes anon.challenge_key.key */
592 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
593 ntlmv2->ntlmv2_hash);
594 if (rc)
595 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
596
597 return rc;
598}
599
600static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
601{
602 int rc;
603 unsigned int size;
604
605 /* check if already allocated */
606 if (server->secmech.sdeschmacmd5)
607 return 0;
608
609 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
610 if (IS_ERR(server->secmech.hmacmd5)) {
611 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
612 rc = PTR_ERR(server->secmech.hmacmd5);
613 server->secmech.hmacmd5 = NULL;
614 return rc;
615 }
616
617 size = sizeof(struct shash_desc) +
618 crypto_shash_descsize(server->secmech.hmacmd5);
619 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
620 if (!server->secmech.sdeschmacmd5) {
621 crypto_free_shash(server->secmech.hmacmd5);
622 server->secmech.hmacmd5 = NULL;
623 return -ENOMEM;
624 }
625 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
626 server->secmech.sdeschmacmd5->shash.flags = 0x0;
627
628 return 0;
629}
630
631int
632setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
633{
634 int rc;
635 int baselen;
636 unsigned int tilen;
637 struct ntlmv2_resp *ntlmv2;
638 char ntlmv2_hash[16];
639 unsigned char *tiblob = NULL; /* target info blob */
640
641 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
642 if (!ses->domainName) {
643 rc = find_domain_name(ses, nls_cp);
644 if (rc) {
645 cifs_dbg(VFS, "error %d finding domain name\n",
646 rc);
647 goto setup_ntlmv2_rsp_ret;
648 }
649 }
650 } else {
651 rc = build_avpair_blob(ses, nls_cp);
652 if (rc) {
653 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
654 goto setup_ntlmv2_rsp_ret;
655 }
656 }
657
658 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
659 tilen = ses->auth_key.len;
660 tiblob = ses->auth_key.response;
661
662 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
663 if (!ses->auth_key.response) {
664 rc = ENOMEM;
665 ses->auth_key.len = 0;
666 goto setup_ntlmv2_rsp_ret;
667 }
668 ses->auth_key.len += baselen;
669
670 ntlmv2 = (struct ntlmv2_resp *)
671 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
672 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
673 ntlmv2->reserved = 0;
674 /* Must be within 5 minutes of the server */
675 ntlmv2->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
676 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
677 ntlmv2->reserved2 = 0;
678
679 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
680
681 rc = crypto_hmacmd5_alloc(ses->server);
682 if (rc) {
683 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
684 goto setup_ntlmv2_rsp_ret;
685 }
686
687 /* calculate ntlmv2_hash */
688 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
689 if (rc) {
690 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
691 goto setup_ntlmv2_rsp_ret;
692 }
693
694 /* calculate first part of the client response (CR1) */
695 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
696 if (rc) {
697 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
698 goto setup_ntlmv2_rsp_ret;
699 }
700
701 /* now calculate the session key for NTLMv2 */
702 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
703 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
704 if (rc) {
705 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
706 __func__);
707 goto setup_ntlmv2_rsp_ret;
708 }
709
710 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
711 if (rc) {
712 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
713 goto setup_ntlmv2_rsp_ret;
714 }
715
716 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
717 ntlmv2->ntlmv2_hash,
718 CIFS_HMAC_MD5_HASH_SIZE);
719 if (rc) {
720 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
721 goto setup_ntlmv2_rsp_ret;
722 }
723
724 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
725 ses->auth_key.response);
726 if (rc)
727 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
728
729setup_ntlmv2_rsp_ret:
730 kfree(tiblob);
731
732 return rc;
733}
734
735int
736calc_seckey(struct cifs_ses *ses)
737{
738 int rc;
739 struct crypto_blkcipher *tfm_arc4;
740 struct scatterlist sgin, sgout;
741 struct blkcipher_desc desc;
742 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
743
744 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
745
746 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
747 if (IS_ERR(tfm_arc4)) {
748 rc = PTR_ERR(tfm_arc4);
749 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
750 return rc;
751 }
752
753 desc.tfm = tfm_arc4;
754
755 rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
756 CIFS_SESS_KEY_SIZE);
757 if (rc) {
758 cifs_dbg(VFS, "%s: Could not set response as a key\n",
759 __func__);
760 return rc;
761 }
762
763 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
764 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
765
766 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
767 if (rc) {
768 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
769 crypto_free_blkcipher(tfm_arc4);
770 return rc;
771 }
772
773 /* make secondary_key/nonce as session key */
774 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
775 /* and make len as that of session key only */
776 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
777
778 crypto_free_blkcipher(tfm_arc4);
779
780 return rc;
781}
782
783void
784cifs_crypto_shash_release(struct TCP_Server_Info *server)
785{
786 if (server->secmech.cmacaes) {
787 crypto_free_shash(server->secmech.cmacaes);
788 server->secmech.cmacaes = NULL;
789 }
790
791 if (server->secmech.hmacsha256) {
792 crypto_free_shash(server->secmech.hmacsha256);
793 server->secmech.hmacsha256 = NULL;
794 }
795
796 if (server->secmech.md5) {
797 crypto_free_shash(server->secmech.md5);
798 server->secmech.md5 = NULL;
799 }
800
801 if (server->secmech.hmacmd5) {
802 crypto_free_shash(server->secmech.hmacmd5);
803 server->secmech.hmacmd5 = NULL;
804 }
805
806 kfree(server->secmech.sdesccmacaes);
807 server->secmech.sdesccmacaes = NULL;
808 kfree(server->secmech.sdeschmacsha256);
809 server->secmech.sdeschmacsha256 = NULL;
810 kfree(server->secmech.sdeschmacmd5);
811 server->secmech.sdeschmacmd5 = NULL;
812 kfree(server->secmech.sdescmd5);
813 server->secmech.sdescmd5 = NULL;
814}