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1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * fs/cifs/cifsencrypt.c
4 *
5 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
6 * for more detailed information
7 *
8 * Copyright (C) International Business Machines Corp., 2005,2013
9 * Author(s): Steve French (sfrench@us.ibm.com)
10 *
11 */
12
13#include <linux/fs.h>
14#include <linux/slab.h>
15#include "cifspdu.h"
16#include "cifsglob.h"
17#include "cifs_debug.h"
18#include "cifs_unicode.h"
19#include "cifsproto.h"
20#include "ntlmssp.h"
21#include <linux/ctype.h>
22#include <linux/random.h>
23#include <linux/highmem.h>
24#include <linux/fips.h>
25#include <crypto/arc4.h>
26#include <crypto/aead.h>
27
28int __cifs_calc_signature(struct smb_rqst *rqst,
29 struct TCP_Server_Info *server, char *signature,
30 struct shash_desc *shash)
31{
32 int i;
33 int rc;
34 struct kvec *iov = rqst->rq_iov;
35 int n_vec = rqst->rq_nvec;
36 int is_smb2 = server->vals->header_preamble_size == 0;
37
38 /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
39 if (is_smb2) {
40 if (iov[0].iov_len <= 4)
41 return -EIO;
42 i = 0;
43 } else {
44 if (n_vec < 2 || iov[0].iov_len != 4)
45 return -EIO;
46 i = 1; /* skip rfc1002 length */
47 }
48
49 for (; i < n_vec; i++) {
50 if (iov[i].iov_len == 0)
51 continue;
52 if (iov[i].iov_base == NULL) {
53 cifs_dbg(VFS, "null iovec entry\n");
54 return -EIO;
55 }
56
57 rc = crypto_shash_update(shash,
58 iov[i].iov_base, iov[i].iov_len);
59 if (rc) {
60 cifs_dbg(VFS, "%s: Could not update with payload\n",
61 __func__);
62 return rc;
63 }
64 }
65
66 /* now hash over the rq_pages array */
67 for (i = 0; i < rqst->rq_npages; i++) {
68 void *kaddr;
69 unsigned int len, offset;
70
71 rqst_page_get_length(rqst, i, &len, &offset);
72
73 kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
74
75 rc = crypto_shash_update(shash, kaddr, len);
76 if (rc) {
77 cifs_dbg(VFS, "%s: Could not update with payload\n",
78 __func__);
79 kunmap(rqst->rq_pages[i]);
80 return rc;
81 }
82
83 kunmap(rqst->rq_pages[i]);
84 }
85
86 rc = crypto_shash_final(shash, signature);
87 if (rc)
88 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
89
90 return rc;
91}
92
93/*
94 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
95 * The 16 byte signature must be allocated by the caller. Note we only use the
96 * 1st eight bytes and that the smb header signature field on input contains
97 * the sequence number before this function is called. Also, this function
98 * should be called with the server->srv_mutex held.
99 */
100static int cifs_calc_signature(struct smb_rqst *rqst,
101 struct TCP_Server_Info *server, char *signature)
102{
103 int rc;
104
105 if (!rqst->rq_iov || !signature || !server)
106 return -EINVAL;
107
108 rc = cifs_alloc_hash("md5", &server->secmech.md5,
109 &server->secmech.sdescmd5);
110 if (rc)
111 return -1;
112
113 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
114 if (rc) {
115 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
116 return rc;
117 }
118
119 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
120 server->session_key.response, server->session_key.len);
121 if (rc) {
122 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
123 return rc;
124 }
125
126 return __cifs_calc_signature(rqst, server, signature,
127 &server->secmech.sdescmd5->shash);
128}
129
130/* must be called with server->srv_mutex held */
131int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
132 __u32 *pexpected_response_sequence_number)
133{
134 int rc = 0;
135 char smb_signature[20];
136 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
137
138 if (rqst->rq_iov[0].iov_len != 4 ||
139 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
140 return -EIO;
141
142 if ((cifs_pdu == NULL) || (server == NULL))
143 return -EINVAL;
144
145 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
146 server->tcpStatus == CifsNeedNegotiate)
147 return rc;
148
149 if (!server->session_estab) {
150 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
151 return rc;
152 }
153
154 cifs_pdu->Signature.Sequence.SequenceNumber =
155 cpu_to_le32(server->sequence_number);
156 cifs_pdu->Signature.Sequence.Reserved = 0;
157
158 *pexpected_response_sequence_number = ++server->sequence_number;
159 ++server->sequence_number;
160
161 rc = cifs_calc_signature(rqst, server, smb_signature);
162 if (rc)
163 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
164 else
165 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
166
167 return rc;
168}
169
170int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
171 __u32 *pexpected_response_sequence)
172{
173 struct smb_rqst rqst = { .rq_iov = iov,
174 .rq_nvec = n_vec };
175
176 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
177}
178
179/* must be called with server->srv_mutex held */
180int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
181 __u32 *pexpected_response_sequence_number)
182{
183 struct kvec iov[2];
184
185 iov[0].iov_base = cifs_pdu;
186 iov[0].iov_len = 4;
187 iov[1].iov_base = (char *)cifs_pdu + 4;
188 iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
189
190 return cifs_sign_smbv(iov, 2, server,
191 pexpected_response_sequence_number);
192}
193
194int cifs_verify_signature(struct smb_rqst *rqst,
195 struct TCP_Server_Info *server,
196 __u32 expected_sequence_number)
197{
198 unsigned int rc;
199 char server_response_sig[8];
200 char what_we_think_sig_should_be[20];
201 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
202
203 if (rqst->rq_iov[0].iov_len != 4 ||
204 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
205 return -EIO;
206
207 if (cifs_pdu == NULL || server == NULL)
208 return -EINVAL;
209
210 if (!server->session_estab)
211 return 0;
212
213 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
214 struct smb_com_lock_req *pSMB =
215 (struct smb_com_lock_req *)cifs_pdu;
216 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
217 return 0;
218 }
219
220 /* BB what if signatures are supposed to be on for session but
221 server does not send one? BB */
222
223 /* Do not need to verify session setups with signature "BSRSPYL " */
224 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
225 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
226 cifs_pdu->Command);
227
228 /* save off the origiginal signature so we can modify the smb and check
229 its signature against what the server sent */
230 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
231
232 cifs_pdu->Signature.Sequence.SequenceNumber =
233 cpu_to_le32(expected_sequence_number);
234 cifs_pdu->Signature.Sequence.Reserved = 0;
235
236 mutex_lock(&server->srv_mutex);
237 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
238 mutex_unlock(&server->srv_mutex);
239
240 if (rc)
241 return rc;
242
243/* cifs_dump_mem("what we think it should be: ",
244 what_we_think_sig_should_be, 16); */
245
246 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
247 return -EACCES;
248 else
249 return 0;
250
251}
252
253/* first calculate 24 bytes ntlm response and then 16 byte session key */
254int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
255{
256 int rc = 0;
257 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
258 char temp_key[CIFS_SESS_KEY_SIZE];
259
260 if (!ses)
261 return -EINVAL;
262
263 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
264 if (!ses->auth_key.response)
265 return -ENOMEM;
266
267 ses->auth_key.len = temp_len;
268
269 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
270 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
271 if (rc) {
272 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
273 __func__, rc);
274 return rc;
275 }
276
277 rc = E_md4hash(ses->password, temp_key, nls_cp);
278 if (rc) {
279 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
280 __func__, rc);
281 return rc;
282 }
283
284 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
285 if (rc)
286 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
287 __func__, rc);
288
289 return rc;
290}
291
292#ifdef CONFIG_CIFS_WEAK_PW_HASH
293int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
294 char *lnm_session_key)
295{
296 int i, len;
297 int rc;
298 char password_with_pad[CIFS_ENCPWD_SIZE] = {0};
299
300 if (password) {
301 for (len = 0; len < CIFS_ENCPWD_SIZE; len++)
302 if (!password[len])
303 break;
304
305 memcpy(password_with_pad, password, len);
306 }
307
308 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
309 memcpy(lnm_session_key, password_with_pad,
310 CIFS_ENCPWD_SIZE);
311 return 0;
312 }
313
314 /* calculate old style session key */
315 /* calling toupper is less broken than repeatedly
316 calling nls_toupper would be since that will never
317 work for UTF8, but neither handles multibyte code pages
318 but the only alternative would be converting to UCS-16 (Unicode)
319 (using a routine something like UniStrupr) then
320 uppercasing and then converting back from Unicode - which
321 would only worth doing it if we knew it were utf8. Basically
322 utf8 and other multibyte codepages each need their own strupper
323 function since a byte at a time will ont work. */
324
325 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
326 password_with_pad[i] = toupper(password_with_pad[i]);
327
328 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
329
330 return rc;
331}
332#endif /* CIFS_WEAK_PW_HASH */
333
334/* Build a proper attribute value/target info pairs blob.
335 * Fill in netbios and dns domain name and workstation name
336 * and client time (total five av pairs and + one end of fields indicator.
337 * Allocate domain name which gets freed when session struct is deallocated.
338 */
339static int
340build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
341{
342 unsigned int dlen;
343 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
344 char *defdmname = "WORKGROUP";
345 unsigned char *blobptr;
346 struct ntlmssp2_name *attrptr;
347
348 if (!ses->domainName) {
349 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
350 if (!ses->domainName)
351 return -ENOMEM;
352 }
353
354 dlen = strlen(ses->domainName);
355
356 /*
357 * The length of this blob is two times the size of a
358 * structure (av pair) which holds name/size
359 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
360 * unicode length of a netbios domain name
361 */
362 ses->auth_key.len = size + 2 * dlen;
363 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
364 if (!ses->auth_key.response) {
365 ses->auth_key.len = 0;
366 return -ENOMEM;
367 }
368
369 blobptr = ses->auth_key.response;
370 attrptr = (struct ntlmssp2_name *) blobptr;
371
372 /*
373 * As defined in MS-NTLM 3.3.2, just this av pair field
374 * is sufficient as part of the temp
375 */
376 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
377 attrptr->length = cpu_to_le16(2 * dlen);
378 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
379 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
380
381 return 0;
382}
383
384/* Server has provided av pairs/target info in the type 2 challenge
385 * packet and we have plucked it and stored within smb session.
386 * We parse that blob here to find netbios domain name to be used
387 * as part of ntlmv2 authentication (in Target String), if not already
388 * specified on the command line.
389 * If this function returns without any error but without fetching
390 * domain name, authentication may fail against some server but
391 * may not fail against other (those who are not very particular
392 * about target string i.e. for some, just user name might suffice.
393 */
394static int
395find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
396{
397 unsigned int attrsize;
398 unsigned int type;
399 unsigned int onesize = sizeof(struct ntlmssp2_name);
400 unsigned char *blobptr;
401 unsigned char *blobend;
402 struct ntlmssp2_name *attrptr;
403
404 if (!ses->auth_key.len || !ses->auth_key.response)
405 return 0;
406
407 blobptr = ses->auth_key.response;
408 blobend = blobptr + ses->auth_key.len;
409
410 while (blobptr + onesize < blobend) {
411 attrptr = (struct ntlmssp2_name *) blobptr;
412 type = le16_to_cpu(attrptr->type);
413 if (type == NTLMSSP_AV_EOL)
414 break;
415 blobptr += 2; /* advance attr type */
416 attrsize = le16_to_cpu(attrptr->length);
417 blobptr += 2; /* advance attr size */
418 if (blobptr + attrsize > blobend)
419 break;
420 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
421 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
422 break;
423 if (!ses->domainName) {
424 ses->domainName =
425 kmalloc(attrsize + 1, GFP_KERNEL);
426 if (!ses->domainName)
427 return -ENOMEM;
428 cifs_from_utf16(ses->domainName,
429 (__le16 *)blobptr, attrsize, attrsize,
430 nls_cp, NO_MAP_UNI_RSVD);
431 break;
432 }
433 }
434 blobptr += attrsize; /* advance attr value */
435 }
436
437 return 0;
438}
439
440/* Server has provided av pairs/target info in the type 2 challenge
441 * packet and we have plucked it and stored within smb session.
442 * We parse that blob here to find the server given timestamp
443 * as part of ntlmv2 authentication (or local current time as
444 * default in case of failure)
445 */
446static __le64
447find_timestamp(struct cifs_ses *ses)
448{
449 unsigned int attrsize;
450 unsigned int type;
451 unsigned int onesize = sizeof(struct ntlmssp2_name);
452 unsigned char *blobptr;
453 unsigned char *blobend;
454 struct ntlmssp2_name *attrptr;
455 struct timespec64 ts;
456
457 if (!ses->auth_key.len || !ses->auth_key.response)
458 return 0;
459
460 blobptr = ses->auth_key.response;
461 blobend = blobptr + ses->auth_key.len;
462
463 while (blobptr + onesize < blobend) {
464 attrptr = (struct ntlmssp2_name *) blobptr;
465 type = le16_to_cpu(attrptr->type);
466 if (type == NTLMSSP_AV_EOL)
467 break;
468 blobptr += 2; /* advance attr type */
469 attrsize = le16_to_cpu(attrptr->length);
470 blobptr += 2; /* advance attr size */
471 if (blobptr + attrsize > blobend)
472 break;
473 if (type == NTLMSSP_AV_TIMESTAMP) {
474 if (attrsize == sizeof(u64))
475 return *((__le64 *)blobptr);
476 }
477 blobptr += attrsize; /* advance attr value */
478 }
479
480 ktime_get_real_ts64(&ts);
481 return cpu_to_le64(cifs_UnixTimeToNT(ts));
482}
483
484static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
485 const struct nls_table *nls_cp)
486{
487 int rc = 0;
488 int len;
489 char nt_hash[CIFS_NTHASH_SIZE];
490 __le16 *user;
491 wchar_t *domain;
492 wchar_t *server;
493
494 if (!ses->server->secmech.sdeschmacmd5) {
495 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
496 return -1;
497 }
498
499 /* calculate md4 hash of password */
500 E_md4hash(ses->password, nt_hash, nls_cp);
501
502 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
503 CIFS_NTHASH_SIZE);
504 if (rc) {
505 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
506 return rc;
507 }
508
509 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
510 if (rc) {
511 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
512 return rc;
513 }
514
515 /* convert ses->user_name to unicode */
516 len = ses->user_name ? strlen(ses->user_name) : 0;
517 user = kmalloc(2 + (len * 2), GFP_KERNEL);
518 if (user == NULL) {
519 rc = -ENOMEM;
520 return rc;
521 }
522
523 if (len) {
524 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
525 UniStrupr(user);
526 } else {
527 memset(user, '\0', 2);
528 }
529
530 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
531 (char *)user, 2 * len);
532 kfree(user);
533 if (rc) {
534 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
535 return rc;
536 }
537
538 /* convert ses->domainName to unicode and uppercase */
539 if (ses->domainName) {
540 len = strlen(ses->domainName);
541
542 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
543 if (domain == NULL) {
544 rc = -ENOMEM;
545 return rc;
546 }
547 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
548 nls_cp);
549 rc =
550 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
551 (char *)domain, 2 * len);
552 kfree(domain);
553 if (rc) {
554 cifs_dbg(VFS, "%s: Could not update with domain\n",
555 __func__);
556 return rc;
557 }
558 } else {
559 /* We use ses->ip_addr if no domain name available */
560 len = strlen(ses->ip_addr);
561
562 server = kmalloc(2 + (len * 2), GFP_KERNEL);
563 if (server == NULL) {
564 rc = -ENOMEM;
565 return rc;
566 }
567 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
568 nls_cp);
569 rc =
570 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
571 (char *)server, 2 * len);
572 kfree(server);
573 if (rc) {
574 cifs_dbg(VFS, "%s: Could not update with server\n",
575 __func__);
576 return rc;
577 }
578 }
579
580 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
581 ntlmv2_hash);
582 if (rc)
583 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
584
585 return rc;
586}
587
588static int
589CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
590{
591 int rc;
592 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
593 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
594 unsigned int hash_len;
595
596 /* The MD5 hash starts at challenge_key.key */
597 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
598 offsetof(struct ntlmv2_resp, challenge.key[0]));
599
600 if (!ses->server->secmech.sdeschmacmd5) {
601 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
602 return -1;
603 }
604
605 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
606 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
607 if (rc) {
608 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
609 __func__);
610 return rc;
611 }
612
613 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
614 if (rc) {
615 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
616 return rc;
617 }
618
619 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
620 memcpy(ntlmv2->challenge.key,
621 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
622 else
623 memcpy(ntlmv2->challenge.key,
624 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
625 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
626 ntlmv2->challenge.key, hash_len);
627 if (rc) {
628 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
629 return rc;
630 }
631
632 /* Note that the MD5 digest over writes anon.challenge_key.key */
633 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
634 ntlmv2->ntlmv2_hash);
635 if (rc)
636 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
637
638 return rc;
639}
640
641int
642setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
643{
644 int rc;
645 int baselen;
646 unsigned int tilen;
647 struct ntlmv2_resp *ntlmv2;
648 char ntlmv2_hash[16];
649 unsigned char *tiblob = NULL; /* target info blob */
650 __le64 rsp_timestamp;
651
652 if (nls_cp == NULL) {
653 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
654 return -EINVAL;
655 }
656
657 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
658 if (!ses->domainName) {
659 if (ses->domainAuto) {
660 rc = find_domain_name(ses, nls_cp);
661 if (rc) {
662 cifs_dbg(VFS, "error %d finding domain name\n",
663 rc);
664 goto setup_ntlmv2_rsp_ret;
665 }
666 } else {
667 ses->domainName = kstrdup("", GFP_KERNEL);
668 }
669 }
670 } else {
671 rc = build_avpair_blob(ses, nls_cp);
672 if (rc) {
673 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
674 goto setup_ntlmv2_rsp_ret;
675 }
676 }
677
678 /* Must be within 5 minutes of the server (or in range +/-2h
679 * in case of Mac OS X), so simply carry over server timestamp
680 * (as Windows 7 does)
681 */
682 rsp_timestamp = find_timestamp(ses);
683
684 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
685 tilen = ses->auth_key.len;
686 tiblob = ses->auth_key.response;
687
688 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
689 if (!ses->auth_key.response) {
690 rc = -ENOMEM;
691 ses->auth_key.len = 0;
692 goto setup_ntlmv2_rsp_ret;
693 }
694 ses->auth_key.len += baselen;
695
696 ntlmv2 = (struct ntlmv2_resp *)
697 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
698 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
699 ntlmv2->reserved = 0;
700 ntlmv2->time = rsp_timestamp;
701
702 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
703 ntlmv2->reserved2 = 0;
704
705 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
706
707 mutex_lock(&ses->server->srv_mutex);
708
709 rc = cifs_alloc_hash("hmac(md5)",
710 &ses->server->secmech.hmacmd5,
711 &ses->server->secmech.sdeschmacmd5);
712 if (rc) {
713 goto unlock;
714 }
715
716 /* calculate ntlmv2_hash */
717 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
718 if (rc) {
719 cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
720 goto unlock;
721 }
722
723 /* calculate first part of the client response (CR1) */
724 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
725 if (rc) {
726 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
727 goto unlock;
728 }
729
730 /* now calculate the session key for NTLMv2 */
731 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
732 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
733 if (rc) {
734 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
735 __func__);
736 goto unlock;
737 }
738
739 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
740 if (rc) {
741 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
742 goto unlock;
743 }
744
745 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
746 ntlmv2->ntlmv2_hash,
747 CIFS_HMAC_MD5_HASH_SIZE);
748 if (rc) {
749 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
750 goto unlock;
751 }
752
753 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
754 ses->auth_key.response);
755 if (rc)
756 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
757
758unlock:
759 mutex_unlock(&ses->server->srv_mutex);
760setup_ntlmv2_rsp_ret:
761 kfree(tiblob);
762
763 return rc;
764}
765
766int
767calc_seckey(struct cifs_ses *ses)
768{
769 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
770 struct arc4_ctx *ctx_arc4;
771
772 if (fips_enabled)
773 return -ENODEV;
774
775 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
776
777 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
778 if (!ctx_arc4) {
779 cifs_dbg(VFS, "Could not allocate arc4 context\n");
780 return -ENOMEM;
781 }
782
783 arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
784 arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
785 CIFS_CPHTXT_SIZE);
786
787 /* make secondary_key/nonce as session key */
788 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
789 /* and make len as that of session key only */
790 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
791
792 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
793 kfree_sensitive(ctx_arc4);
794 return 0;
795}
796
797void
798cifs_crypto_secmech_release(struct TCP_Server_Info *server)
799{
800 if (server->secmech.cmacaes) {
801 crypto_free_shash(server->secmech.cmacaes);
802 server->secmech.cmacaes = NULL;
803 }
804
805 if (server->secmech.hmacsha256) {
806 crypto_free_shash(server->secmech.hmacsha256);
807 server->secmech.hmacsha256 = NULL;
808 }
809
810 if (server->secmech.md5) {
811 crypto_free_shash(server->secmech.md5);
812 server->secmech.md5 = NULL;
813 }
814
815 if (server->secmech.sha512) {
816 crypto_free_shash(server->secmech.sha512);
817 server->secmech.sha512 = NULL;
818 }
819
820 if (server->secmech.hmacmd5) {
821 crypto_free_shash(server->secmech.hmacmd5);
822 server->secmech.hmacmd5 = NULL;
823 }
824
825 if (server->secmech.ccmaesencrypt) {
826 crypto_free_aead(server->secmech.ccmaesencrypt);
827 server->secmech.ccmaesencrypt = NULL;
828 }
829
830 if (server->secmech.ccmaesdecrypt) {
831 crypto_free_aead(server->secmech.ccmaesdecrypt);
832 server->secmech.ccmaesdecrypt = NULL;
833 }
834
835 kfree(server->secmech.sdesccmacaes);
836 server->secmech.sdesccmacaes = NULL;
837 kfree(server->secmech.sdeschmacsha256);
838 server->secmech.sdeschmacsha256 = NULL;
839 kfree(server->secmech.sdeschmacmd5);
840 server->secmech.sdeschmacmd5 = NULL;
841 kfree(server->secmech.sdescmd5);
842 server->secmech.sdescmd5 = NULL;
843 kfree(server->secmech.sdescsha512);
844 server->secmech.sdescsha512 = NULL;
845}