1 // SPDX-License-Identifier: LGPL-2.1
2 /*
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 */
11
12 #include <linux/fs.h>
13 #include <linux/slab.h>
14 #include "cifspdu.h"
15 #include "cifsglob.h"
16 #include "cifs_debug.h"
17 #include "cifs_unicode.h"
18 #include "cifsproto.h"
19 #include "ntlmssp.h"
20 #include <linux/ctype.h>
21 #include <linux/random.h>
22 #include <linux/highmem.h>
23 #include <linux/fips.h>
24 #include "../smbfs_common/arc4.h"
25 #include <crypto/aead.h>
26
__cifs_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server,char * signature,struct shash_desc * shash)27 int __cifs_calc_signature(struct smb_rqst *rqst,
28 struct TCP_Server_Info *server, char *signature,
29 struct shash_desc *shash)
30 {
31 int i;
32 int rc;
33 struct kvec *iov = rqst->rq_iov;
34 int n_vec = rqst->rq_nvec;
35
36 /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
37 if (!is_smb1(server)) {
38 if (iov[0].iov_len <= 4)
39 return -EIO;
40 i = 0;
41 } else {
42 if (n_vec < 2 || iov[0].iov_len != 4)
43 return -EIO;
44 i = 1; /* skip rfc1002 length */
45 }
46
47 for (; i < n_vec; i++) {
48 if (iov[i].iov_len == 0)
49 continue;
50 if (iov[i].iov_base == NULL) {
51 cifs_dbg(VFS, "null iovec entry\n");
52 return -EIO;
53 }
54
55 rc = crypto_shash_update(shash,
56 iov[i].iov_base, iov[i].iov_len);
57 if (rc) {
58 cifs_dbg(VFS, "%s: Could not update with payload\n",
59 __func__);
60 return rc;
61 }
62 }
63
64 /* now hash over the rq_pages array */
65 for (i = 0; i < rqst->rq_npages; i++) {
66 void *kaddr;
67 unsigned int len, offset;
68
69 rqst_page_get_length(rqst, i, &len, &offset);
70
71 kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
72
73 rc = crypto_shash_update(shash, kaddr, len);
74 if (rc) {
75 cifs_dbg(VFS, "%s: Could not update with payload\n",
76 __func__);
77 kunmap(rqst->rq_pages[i]);
78 return rc;
79 }
80
81 kunmap(rqst->rq_pages[i]);
82 }
83
84 rc = crypto_shash_final(shash, signature);
85 if (rc)
86 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
87
88 return rc;
89 }
90
91 /*
92 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
93 * The 16 byte signature must be allocated by the caller. Note we only use the
94 * 1st eight bytes and that the smb header signature field on input contains
95 * the sequence number before this function is called. Also, this function
96 * should be called with the server->srv_mutex held.
97 */
cifs_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server,char * signature)98 static int cifs_calc_signature(struct smb_rqst *rqst,
99 struct TCP_Server_Info *server, char *signature)
100 {
101 int rc;
102
103 if (!rqst->rq_iov || !signature || !server)
104 return -EINVAL;
105
106 rc = cifs_alloc_hash("md5", &server->secmech.md5);
107 if (rc)
108 return -1;
109
110 rc = crypto_shash_init(server->secmech.md5);
111 if (rc) {
112 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
113 return rc;
114 }
115
116 rc = crypto_shash_update(server->secmech.md5,
117 server->session_key.response, server->session_key.len);
118 if (rc) {
119 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
120 return rc;
121 }
122
123 return __cifs_calc_signature(rqst, server, signature, server->secmech.md5);
124 }
125
126 /* must be called with server->srv_mutex held */
cifs_sign_rqst(struct smb_rqst * rqst,struct TCP_Server_Info * server,__u32 * pexpected_response_sequence_number)127 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
128 __u32 *pexpected_response_sequence_number)
129 {
130 int rc = 0;
131 char smb_signature[20];
132 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
133
134 if (rqst->rq_iov[0].iov_len != 4 ||
135 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
136 return -EIO;
137
138 if ((cifs_pdu == NULL) || (server == NULL))
139 return -EINVAL;
140
141 spin_lock(&server->srv_lock);
142 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
143 server->tcpStatus == CifsNeedNegotiate) {
144 spin_unlock(&server->srv_lock);
145 return rc;
146 }
147 spin_unlock(&server->srv_lock);
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
cifs_sign_smbv(struct kvec * iov,int n_vec,struct TCP_Server_Info * server,__u32 * pexpected_response_sequence)170 int 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 */
cifs_sign_smb(struct smb_hdr * cifs_pdu,struct TCP_Server_Info * server,__u32 * pexpected_response_sequence_number)180 int 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
cifs_verify_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server,__u32 expected_sequence_number)194 int 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 cifs_server_lock(server);
237 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
238 cifs_server_unlock(server);
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 /* Build a proper attribute value/target info pairs blob.
254 * Fill in netbios and dns domain name and workstation name
255 * and client time (total five av pairs and + one end of fields indicator.
256 * Allocate domain name which gets freed when session struct is deallocated.
257 */
258 static int
build_avpair_blob(struct cifs_ses * ses,const struct nls_table * nls_cp)259 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
260 {
261 unsigned int dlen;
262 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
263 char *defdmname = "WORKGROUP";
264 unsigned char *blobptr;
265 struct ntlmssp2_name *attrptr;
266
267 if (!ses->domainName) {
268 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
269 if (!ses->domainName)
270 return -ENOMEM;
271 }
272
273 dlen = strlen(ses->domainName);
274
275 /*
276 * The length of this blob is two times the size of a
277 * structure (av pair) which holds name/size
278 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
279 * unicode length of a netbios domain name
280 */
281 ses->auth_key.len = size + 2 * dlen;
282 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
283 if (!ses->auth_key.response) {
284 ses->auth_key.len = 0;
285 return -ENOMEM;
286 }
287
288 blobptr = ses->auth_key.response;
289 attrptr = (struct ntlmssp2_name *) blobptr;
290
291 /*
292 * As defined in MS-NTLM 3.3.2, just this av pair field
293 * is sufficient as part of the temp
294 */
295 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
296 attrptr->length = cpu_to_le16(2 * dlen);
297 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
298 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
299
300 return 0;
301 }
302
303 /* Server has provided av pairs/target info in the type 2 challenge
304 * packet and we have plucked it and stored within smb session.
305 * We parse that blob here to find netbios domain name to be used
306 * as part of ntlmv2 authentication (in Target String), if not already
307 * specified on the command line.
308 * If this function returns without any error but without fetching
309 * domain name, authentication may fail against some server but
310 * may not fail against other (those who are not very particular
311 * about target string i.e. for some, just user name might suffice.
312 */
313 static int
find_domain_name(struct cifs_ses * ses,const struct nls_table * nls_cp)314 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
315 {
316 unsigned int attrsize;
317 unsigned int type;
318 unsigned int onesize = sizeof(struct ntlmssp2_name);
319 unsigned char *blobptr;
320 unsigned char *blobend;
321 struct ntlmssp2_name *attrptr;
322
323 if (!ses->auth_key.len || !ses->auth_key.response)
324 return 0;
325
326 blobptr = ses->auth_key.response;
327 blobend = blobptr + ses->auth_key.len;
328
329 while (blobptr + onesize < blobend) {
330 attrptr = (struct ntlmssp2_name *) blobptr;
331 type = le16_to_cpu(attrptr->type);
332 if (type == NTLMSSP_AV_EOL)
333 break;
334 blobptr += 2; /* advance attr type */
335 attrsize = le16_to_cpu(attrptr->length);
336 blobptr += 2; /* advance attr size */
337 if (blobptr + attrsize > blobend)
338 break;
339 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
340 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
341 break;
342 if (!ses->domainName) {
343 ses->domainName =
344 kmalloc(attrsize + 1, GFP_KERNEL);
345 if (!ses->domainName)
346 return -ENOMEM;
347 cifs_from_utf16(ses->domainName,
348 (__le16 *)blobptr, attrsize, attrsize,
349 nls_cp, NO_MAP_UNI_RSVD);
350 break;
351 }
352 }
353 blobptr += attrsize; /* advance attr value */
354 }
355
356 return 0;
357 }
358
359 /* Server has provided av pairs/target info in the type 2 challenge
360 * packet and we have plucked it and stored within smb session.
361 * We parse that blob here to find the server given timestamp
362 * as part of ntlmv2 authentication (or local current time as
363 * default in case of failure)
364 */
365 static __le64
find_timestamp(struct cifs_ses * ses)366 find_timestamp(struct cifs_ses *ses)
367 {
368 unsigned int attrsize;
369 unsigned int type;
370 unsigned int onesize = sizeof(struct ntlmssp2_name);
371 unsigned char *blobptr;
372 unsigned char *blobend;
373 struct ntlmssp2_name *attrptr;
374 struct timespec64 ts;
375
376 if (!ses->auth_key.len || !ses->auth_key.response)
377 return 0;
378
379 blobptr = ses->auth_key.response;
380 blobend = blobptr + ses->auth_key.len;
381
382 while (blobptr + onesize < blobend) {
383 attrptr = (struct ntlmssp2_name *) blobptr;
384 type = le16_to_cpu(attrptr->type);
385 if (type == NTLMSSP_AV_EOL)
386 break;
387 blobptr += 2; /* advance attr type */
388 attrsize = le16_to_cpu(attrptr->length);
389 blobptr += 2; /* advance attr size */
390 if (blobptr + attrsize > blobend)
391 break;
392 if (type == NTLMSSP_AV_TIMESTAMP) {
393 if (attrsize == sizeof(u64))
394 return *((__le64 *)blobptr);
395 }
396 blobptr += attrsize; /* advance attr value */
397 }
398
399 ktime_get_real_ts64(&ts);
400 return cpu_to_le64(cifs_UnixTimeToNT(ts));
401 }
402
calc_ntlmv2_hash(struct cifs_ses * ses,char * ntlmv2_hash,const struct nls_table * nls_cp)403 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
404 const struct nls_table *nls_cp)
405 {
406 int rc = 0;
407 int len;
408 char nt_hash[CIFS_NTHASH_SIZE];
409 __le16 *user;
410 wchar_t *domain;
411 wchar_t *server;
412
413 if (!ses->server->secmech.hmacmd5) {
414 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
415 return -1;
416 }
417
418 /* calculate md4 hash of password */
419 E_md4hash(ses->password, nt_hash, nls_cp);
420
421 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, nt_hash,
422 CIFS_NTHASH_SIZE);
423 if (rc) {
424 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
425 return rc;
426 }
427
428 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
429 if (rc) {
430 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
431 return rc;
432 }
433
434 /* convert ses->user_name to unicode */
435 len = ses->user_name ? strlen(ses->user_name) : 0;
436 user = kmalloc(2 + (len * 2), GFP_KERNEL);
437 if (user == NULL) {
438 rc = -ENOMEM;
439 return rc;
440 }
441
442 if (len) {
443 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
444 UniStrupr(user);
445 } else {
446 memset(user, '\0', 2);
447 }
448
449 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
450 (char *)user, 2 * len);
451 kfree(user);
452 if (rc) {
453 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
454 return rc;
455 }
456
457 /* convert ses->domainName to unicode and uppercase */
458 if (ses->domainName) {
459 len = strlen(ses->domainName);
460
461 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
462 if (domain == NULL) {
463 rc = -ENOMEM;
464 return rc;
465 }
466 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
467 nls_cp);
468 rc =
469 crypto_shash_update(ses->server->secmech.hmacmd5,
470 (char *)domain, 2 * len);
471 kfree(domain);
472 if (rc) {
473 cifs_dbg(VFS, "%s: Could not update with domain\n",
474 __func__);
475 return rc;
476 }
477 } else {
478 /* We use ses->ip_addr if no domain name available */
479 len = strlen(ses->ip_addr);
480
481 server = kmalloc(2 + (len * 2), GFP_KERNEL);
482 if (server == NULL) {
483 rc = -ENOMEM;
484 return rc;
485 }
486 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
487 nls_cp);
488 rc =
489 crypto_shash_update(ses->server->secmech.hmacmd5,
490 (char *)server, 2 * len);
491 kfree(server);
492 if (rc) {
493 cifs_dbg(VFS, "%s: Could not update with server\n",
494 __func__);
495 return rc;
496 }
497 }
498
499 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
500 ntlmv2_hash);
501 if (rc)
502 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
503
504 return rc;
505 }
506
507 static int
CalcNTLMv2_response(const struct cifs_ses * ses,char * ntlmv2_hash)508 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
509 {
510 int rc;
511 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
512 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
513 unsigned int hash_len;
514
515 /* The MD5 hash starts at challenge_key.key */
516 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
517 offsetof(struct ntlmv2_resp, challenge.key[0]));
518
519 if (!ses->server->secmech.hmacmd5) {
520 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
521 return -1;
522 }
523
524 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
525 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
526 if (rc) {
527 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
528 __func__);
529 return rc;
530 }
531
532 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
533 if (rc) {
534 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
535 return rc;
536 }
537
538 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
539 memcpy(ntlmv2->challenge.key,
540 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
541 else
542 memcpy(ntlmv2->challenge.key,
543 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
544 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
545 ntlmv2->challenge.key, hash_len);
546 if (rc) {
547 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
548 return rc;
549 }
550
551 /* Note that the MD5 digest over writes anon.challenge_key.key */
552 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
553 ntlmv2->ntlmv2_hash);
554 if (rc)
555 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
556
557 return rc;
558 }
559
560 int
setup_ntlmv2_rsp(struct cifs_ses * ses,const struct nls_table * nls_cp)561 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
562 {
563 int rc;
564 int baselen;
565 unsigned int tilen;
566 struct ntlmv2_resp *ntlmv2;
567 char ntlmv2_hash[16];
568 unsigned char *tiblob = NULL; /* target info blob */
569 __le64 rsp_timestamp;
570
571 if (nls_cp == NULL) {
572 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
573 return -EINVAL;
574 }
575
576 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
577 if (!ses->domainName) {
578 if (ses->domainAuto) {
579 rc = find_domain_name(ses, nls_cp);
580 if (rc) {
581 cifs_dbg(VFS, "error %d finding domain name\n",
582 rc);
583 goto setup_ntlmv2_rsp_ret;
584 }
585 } else {
586 ses->domainName = kstrdup("", GFP_KERNEL);
587 }
588 }
589 } else {
590 rc = build_avpair_blob(ses, nls_cp);
591 if (rc) {
592 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
593 goto setup_ntlmv2_rsp_ret;
594 }
595 }
596
597 /* Must be within 5 minutes of the server (or in range +/-2h
598 * in case of Mac OS X), so simply carry over server timestamp
599 * (as Windows 7 does)
600 */
601 rsp_timestamp = find_timestamp(ses);
602
603 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
604 tilen = ses->auth_key.len;
605 tiblob = ses->auth_key.response;
606
607 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
608 if (!ses->auth_key.response) {
609 rc = -ENOMEM;
610 ses->auth_key.len = 0;
611 goto setup_ntlmv2_rsp_ret;
612 }
613 ses->auth_key.len += baselen;
614
615 ntlmv2 = (struct ntlmv2_resp *)
616 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
617 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
618 ntlmv2->reserved = 0;
619 ntlmv2->time = rsp_timestamp;
620
621 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
622 ntlmv2->reserved2 = 0;
623
624 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
625
626 cifs_server_lock(ses->server);
627
628 rc = cifs_alloc_hash("hmac(md5)", &ses->server->secmech.hmacmd5);
629 if (rc) {
630 goto unlock;
631 }
632
633 /* calculate ntlmv2_hash */
634 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
635 if (rc) {
636 cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
637 goto unlock;
638 }
639
640 /* calculate first part of the client response (CR1) */
641 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
642 if (rc) {
643 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
644 goto unlock;
645 }
646
647 /* now calculate the session key for NTLMv2 */
648 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
649 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
650 if (rc) {
651 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
652 __func__);
653 goto unlock;
654 }
655
656 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
657 if (rc) {
658 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
659 goto unlock;
660 }
661
662 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
663 ntlmv2->ntlmv2_hash,
664 CIFS_HMAC_MD5_HASH_SIZE);
665 if (rc) {
666 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
667 goto unlock;
668 }
669
670 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
671 ses->auth_key.response);
672 if (rc)
673 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
674
675 unlock:
676 cifs_server_unlock(ses->server);
677 setup_ntlmv2_rsp_ret:
678 kfree_sensitive(tiblob);
679
680 return rc;
681 }
682
683 int
calc_seckey(struct cifs_ses * ses)684 calc_seckey(struct cifs_ses *ses)
685 {
686 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
687 struct arc4_ctx *ctx_arc4;
688
689 if (fips_enabled)
690 return -ENODEV;
691
692 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
693
694 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
695 if (!ctx_arc4) {
696 cifs_dbg(VFS, "Could not allocate arc4 context\n");
697 return -ENOMEM;
698 }
699
700 cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
701 cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
702 CIFS_CPHTXT_SIZE);
703
704 /* make secondary_key/nonce as session key */
705 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
706 /* and make len as that of session key only */
707 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
708
709 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
710 kfree_sensitive(ctx_arc4);
711 return 0;
712 }
713
714 void
cifs_crypto_secmech_release(struct TCP_Server_Info * server)715 cifs_crypto_secmech_release(struct TCP_Server_Info *server)
716 {
717 cifs_free_hash(&server->secmech.aes_cmac);
718 cifs_free_hash(&server->secmech.hmacsha256);
719 cifs_free_hash(&server->secmech.md5);
720 cifs_free_hash(&server->secmech.sha512);
721 cifs_free_hash(&server->secmech.hmacmd5);
722
723 if (server->secmech.enc) {
724 crypto_free_aead(server->secmech.enc);
725 server->secmech.enc = NULL;
726 }
727
728 if (server->secmech.dec) {
729 crypto_free_aead(server->secmech.dec);
730 server->secmech.dec = NULL;
731 }
732 }
733