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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
27int __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 */
98static 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 */
127int 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
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 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 */
258static int
259build_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 kfree_sensitive(ses->auth_key.response);
282 ses->auth_key.len = size + 2 * dlen;
283 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
284 if (!ses->auth_key.response) {
285 ses->auth_key.len = 0;
286 return -ENOMEM;
287 }
288
289 blobptr = ses->auth_key.response;
290 attrptr = (struct ntlmssp2_name *) blobptr;
291
292 /*
293 * As defined in MS-NTLM 3.3.2, just this av pair field
294 * is sufficient as part of the temp
295 */
296 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
297 attrptr->length = cpu_to_le16(2 * dlen);
298 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
299 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
300
301 return 0;
302}
303
304/* Server has provided av pairs/target info in the type 2 challenge
305 * packet and we have plucked it and stored within smb session.
306 * We parse that blob here to find netbios domain name to be used
307 * as part of ntlmv2 authentication (in Target String), if not already
308 * specified on the command line.
309 * If this function returns without any error but without fetching
310 * domain name, authentication may fail against some server but
311 * may not fail against other (those who are not very particular
312 * about target string i.e. for some, just user name might suffice.
313 */
314static int
315find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
316{
317 unsigned int attrsize;
318 unsigned int type;
319 unsigned int onesize = sizeof(struct ntlmssp2_name);
320 unsigned char *blobptr;
321 unsigned char *blobend;
322 struct ntlmssp2_name *attrptr;
323
324 if (!ses->auth_key.len || !ses->auth_key.response)
325 return 0;
326
327 blobptr = ses->auth_key.response;
328 blobend = blobptr + ses->auth_key.len;
329
330 while (blobptr + onesize < blobend) {
331 attrptr = (struct ntlmssp2_name *) blobptr;
332 type = le16_to_cpu(attrptr->type);
333 if (type == NTLMSSP_AV_EOL)
334 break;
335 blobptr += 2; /* advance attr type */
336 attrsize = le16_to_cpu(attrptr->length);
337 blobptr += 2; /* advance attr size */
338 if (blobptr + attrsize > blobend)
339 break;
340 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
341 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
342 break;
343 if (!ses->domainName) {
344 ses->domainName =
345 kmalloc(attrsize + 1, GFP_KERNEL);
346 if (!ses->domainName)
347 return -ENOMEM;
348 cifs_from_utf16(ses->domainName,
349 (__le16 *)blobptr, attrsize, attrsize,
350 nls_cp, NO_MAP_UNI_RSVD);
351 break;
352 }
353 }
354 blobptr += attrsize; /* advance attr value */
355 }
356
357 return 0;
358}
359
360/* Server has provided av pairs/target info in the type 2 challenge
361 * packet and we have plucked it and stored within smb session.
362 * We parse that blob here to find the server given timestamp
363 * as part of ntlmv2 authentication (or local current time as
364 * default in case of failure)
365 */
366static __le64
367find_timestamp(struct cifs_ses *ses)
368{
369 unsigned int attrsize;
370 unsigned int type;
371 unsigned int onesize = sizeof(struct ntlmssp2_name);
372 unsigned char *blobptr;
373 unsigned char *blobend;
374 struct ntlmssp2_name *attrptr;
375 struct timespec64 ts;
376
377 if (!ses->auth_key.len || !ses->auth_key.response)
378 return 0;
379
380 blobptr = ses->auth_key.response;
381 blobend = blobptr + ses->auth_key.len;
382
383 while (blobptr + onesize < blobend) {
384 attrptr = (struct ntlmssp2_name *) blobptr;
385 type = le16_to_cpu(attrptr->type);
386 if (type == NTLMSSP_AV_EOL)
387 break;
388 blobptr += 2; /* advance attr type */
389 attrsize = le16_to_cpu(attrptr->length);
390 blobptr += 2; /* advance attr size */
391 if (blobptr + attrsize > blobend)
392 break;
393 if (type == NTLMSSP_AV_TIMESTAMP) {
394 if (attrsize == sizeof(u64))
395 return *((__le64 *)blobptr);
396 }
397 blobptr += attrsize; /* advance attr value */
398 }
399
400 ktime_get_real_ts64(&ts);
401 return cpu_to_le64(cifs_UnixTimeToNT(ts));
402}
403
404static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
405 const struct nls_table *nls_cp)
406{
407 int rc = 0;
408 int len;
409 char nt_hash[CIFS_NTHASH_SIZE];
410 __le16 *user;
411 wchar_t *domain;
412 wchar_t *server;
413
414 if (!ses->server->secmech.hmacmd5) {
415 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
416 return -1;
417 }
418
419 /* calculate md4 hash of password */
420 E_md4hash(ses->password, nt_hash, nls_cp);
421
422 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, nt_hash,
423 CIFS_NTHASH_SIZE);
424 if (rc) {
425 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
426 return rc;
427 }
428
429 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
430 if (rc) {
431 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
432 return rc;
433 }
434
435 /* convert ses->user_name to unicode */
436 len = ses->user_name ? strlen(ses->user_name) : 0;
437 user = kmalloc(2 + (len * 2), GFP_KERNEL);
438 if (user == NULL) {
439 rc = -ENOMEM;
440 return rc;
441 }
442
443 if (len) {
444 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
445 UniStrupr(user);
446 } else {
447 memset(user, '\0', 2);
448 }
449
450 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
451 (char *)user, 2 * len);
452 kfree(user);
453 if (rc) {
454 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
455 return rc;
456 }
457
458 /* convert ses->domainName to unicode and uppercase */
459 if (ses->domainName) {
460 len = strlen(ses->domainName);
461
462 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
463 if (domain == NULL) {
464 rc = -ENOMEM;
465 return rc;
466 }
467 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
468 nls_cp);
469 rc =
470 crypto_shash_update(ses->server->secmech.hmacmd5,
471 (char *)domain, 2 * len);
472 kfree(domain);
473 if (rc) {
474 cifs_dbg(VFS, "%s: Could not update with domain\n",
475 __func__);
476 return rc;
477 }
478 } else {
479 /* We use ses->ip_addr if no domain name available */
480 len = strlen(ses->ip_addr);
481
482 server = kmalloc(2 + (len * 2), GFP_KERNEL);
483 if (server == NULL) {
484 rc = -ENOMEM;
485 return rc;
486 }
487 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
488 nls_cp);
489 rc =
490 crypto_shash_update(ses->server->secmech.hmacmd5,
491 (char *)server, 2 * len);
492 kfree(server);
493 if (rc) {
494 cifs_dbg(VFS, "%s: Could not update with server\n",
495 __func__);
496 return rc;
497 }
498 }
499
500 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
501 ntlmv2_hash);
502 if (rc)
503 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
504
505 return rc;
506}
507
508static int
509CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
510{
511 int rc;
512 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
513 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
514 unsigned int hash_len;
515
516 /* The MD5 hash starts at challenge_key.key */
517 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
518 offsetof(struct ntlmv2_resp, challenge.key[0]));
519
520 if (!ses->server->secmech.hmacmd5) {
521 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
522 return -1;
523 }
524
525 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
526 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
527 if (rc) {
528 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
529 __func__);
530 return rc;
531 }
532
533 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
534 if (rc) {
535 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
536 return rc;
537 }
538
539 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
540 memcpy(ntlmv2->challenge.key,
541 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
542 else
543 memcpy(ntlmv2->challenge.key,
544 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
545 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
546 ntlmv2->challenge.key, hash_len);
547 if (rc) {
548 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
549 return rc;
550 }
551
552 /* Note that the MD5 digest over writes anon.challenge_key.key */
553 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
554 ntlmv2->ntlmv2_hash);
555 if (rc)
556 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
557
558 return rc;
559}
560
561int
562setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
563{
564 int rc;
565 int baselen;
566 unsigned int tilen;
567 struct ntlmv2_resp *ntlmv2;
568 char ntlmv2_hash[16];
569 unsigned char *tiblob = NULL; /* target info blob */
570 __le64 rsp_timestamp;
571
572 if (nls_cp == NULL) {
573 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
574 return -EINVAL;
575 }
576
577 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
578 if (!ses->domainName) {
579 if (ses->domainAuto) {
580 rc = find_domain_name(ses, nls_cp);
581 if (rc) {
582 cifs_dbg(VFS, "error %d finding domain name\n",
583 rc);
584 goto setup_ntlmv2_rsp_ret;
585 }
586 } else {
587 ses->domainName = kstrdup("", GFP_KERNEL);
588 }
589 }
590 } else {
591 rc = build_avpair_blob(ses, nls_cp);
592 if (rc) {
593 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
594 goto setup_ntlmv2_rsp_ret;
595 }
596 }
597
598 /* Must be within 5 minutes of the server (or in range +/-2h
599 * in case of Mac OS X), so simply carry over server timestamp
600 * (as Windows 7 does)
601 */
602 rsp_timestamp = find_timestamp(ses);
603
604 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
605 tilen = ses->auth_key.len;
606 tiblob = ses->auth_key.response;
607
608 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
609 if (!ses->auth_key.response) {
610 rc = -ENOMEM;
611 ses->auth_key.len = 0;
612 goto setup_ntlmv2_rsp_ret;
613 }
614 ses->auth_key.len += baselen;
615
616 ntlmv2 = (struct ntlmv2_resp *)
617 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
618 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
619 ntlmv2->reserved = 0;
620 ntlmv2->time = rsp_timestamp;
621
622 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
623 ntlmv2->reserved2 = 0;
624
625 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
626
627 cifs_server_lock(ses->server);
628
629 rc = cifs_alloc_hash("hmac(md5)", &ses->server->secmech.hmacmd5);
630 if (rc) {
631 goto unlock;
632 }
633
634 /* calculate ntlmv2_hash */
635 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
636 if (rc) {
637 cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
638 goto unlock;
639 }
640
641 /* calculate first part of the client response (CR1) */
642 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
643 if (rc) {
644 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
645 goto unlock;
646 }
647
648 /* now calculate the session key for NTLMv2 */
649 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
650 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
651 if (rc) {
652 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
653 __func__);
654 goto unlock;
655 }
656
657 rc = crypto_shash_init(ses->server->secmech.hmacmd5);
658 if (rc) {
659 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
660 goto unlock;
661 }
662
663 rc = crypto_shash_update(ses->server->secmech.hmacmd5,
664 ntlmv2->ntlmv2_hash,
665 CIFS_HMAC_MD5_HASH_SIZE);
666 if (rc) {
667 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
668 goto unlock;
669 }
670
671 rc = crypto_shash_final(ses->server->secmech.hmacmd5,
672 ses->auth_key.response);
673 if (rc)
674 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
675
676unlock:
677 cifs_server_unlock(ses->server);
678setup_ntlmv2_rsp_ret:
679 kfree_sensitive(tiblob);
680
681 return rc;
682}
683
684int
685calc_seckey(struct cifs_ses *ses)
686{
687 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
688 struct arc4_ctx *ctx_arc4;
689
690 if (fips_enabled)
691 return -ENODEV;
692
693 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
694
695 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
696 if (!ctx_arc4) {
697 cifs_dbg(VFS, "Could not allocate arc4 context\n");
698 return -ENOMEM;
699 }
700
701 cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
702 cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
703 CIFS_CPHTXT_SIZE);
704
705 /* make secondary_key/nonce as session key */
706 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
707 /* and make len as that of session key only */
708 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
709
710 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
711 kfree_sensitive(ctx_arc4);
712 return 0;
713}
714
715void
716cifs_crypto_secmech_release(struct TCP_Server_Info *server)
717{
718 cifs_free_hash(&server->secmech.aes_cmac);
719 cifs_free_hash(&server->secmech.hmacsha256);
720 cifs_free_hash(&server->secmech.md5);
721 cifs_free_hash(&server->secmech.sha512);
722 cifs_free_hash(&server->secmech.hmacmd5);
723
724 if (server->secmech.enc) {
725 crypto_free_aead(server->secmech.enc);
726 server->secmech.enc = NULL;
727 }
728
729 if (server->secmech.dec) {
730 crypto_free_aead(server->secmech.dec);
731 server->secmech.dec = NULL;
732 }
733}
1/*
2 * fs/cifs/cifsencrypt.c
3 *
4 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
5 * for more detailed information
6 *
7 * Copyright (C) International Business Machines Corp., 2005,2013
8 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25#include <linux/fs.h>
26#include <linux/slab.h>
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifs_debug.h"
30#include "cifs_unicode.h"
31#include "cifsproto.h"
32#include "ntlmssp.h"
33#include <linux/ctype.h>
34#include <linux/random.h>
35#include <linux/highmem.h>
36#include <linux/fips.h>
37#include <crypto/arc4.h>
38#include <crypto/aead.h>
39
40int __cifs_calc_signature(struct smb_rqst *rqst,
41 struct TCP_Server_Info *server, char *signature,
42 struct shash_desc *shash)
43{
44 int i;
45 int rc;
46 struct kvec *iov = rqst->rq_iov;
47 int n_vec = rqst->rq_nvec;
48 int is_smb2 = server->vals->header_preamble_size == 0;
49
50 /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
51 if (is_smb2) {
52 if (iov[0].iov_len <= 4)
53 return -EIO;
54 i = 0;
55 } else {
56 if (n_vec < 2 || iov[0].iov_len != 4)
57 return -EIO;
58 i = 1; /* skip rfc1002 length */
59 }
60
61 for (; i < n_vec; i++) {
62 if (iov[i].iov_len == 0)
63 continue;
64 if (iov[i].iov_base == NULL) {
65 cifs_dbg(VFS, "null iovec entry\n");
66 return -EIO;
67 }
68
69 rc = crypto_shash_update(shash,
70 iov[i].iov_base, iov[i].iov_len);
71 if (rc) {
72 cifs_dbg(VFS, "%s: Could not update with payload\n",
73 __func__);
74 return rc;
75 }
76 }
77
78 /* now hash over the rq_pages array */
79 for (i = 0; i < rqst->rq_npages; i++) {
80 void *kaddr;
81 unsigned int len, offset;
82
83 rqst_page_get_length(rqst, i, &len, &offset);
84
85 kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
86
87 rc = crypto_shash_update(shash, kaddr, len);
88 if (rc) {
89 cifs_dbg(VFS, "%s: Could not update with payload\n",
90 __func__);
91 kunmap(rqst->rq_pages[i]);
92 return rc;
93 }
94
95 kunmap(rqst->rq_pages[i]);
96 }
97
98 rc = crypto_shash_final(shash, signature);
99 if (rc)
100 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
101
102 return rc;
103}
104
105/*
106 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
107 * The 16 byte signature must be allocated by the caller. Note we only use the
108 * 1st eight bytes and that the smb header signature field on input contains
109 * the sequence number before this function is called. Also, this function
110 * should be called with the server->srv_mutex held.
111 */
112static int cifs_calc_signature(struct smb_rqst *rqst,
113 struct TCP_Server_Info *server, char *signature)
114{
115 int rc;
116
117 if (!rqst->rq_iov || !signature || !server)
118 return -EINVAL;
119
120 rc = cifs_alloc_hash("md5", &server->secmech.md5,
121 &server->secmech.sdescmd5);
122 if (rc)
123 return -1;
124
125 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
126 if (rc) {
127 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
128 return rc;
129 }
130
131 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
132 server->session_key.response, server->session_key.len);
133 if (rc) {
134 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
135 return rc;
136 }
137
138 return __cifs_calc_signature(rqst, server, signature,
139 &server->secmech.sdescmd5->shash);
140}
141
142/* must be called with server->srv_mutex held */
143int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
144 __u32 *pexpected_response_sequence_number)
145{
146 int rc = 0;
147 char smb_signature[20];
148 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
149
150 if (rqst->rq_iov[0].iov_len != 4 ||
151 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
152 return -EIO;
153
154 if ((cifs_pdu == NULL) || (server == NULL))
155 return -EINVAL;
156
157 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
158 server->tcpStatus == CifsNeedNegotiate)
159 return rc;
160
161 if (!server->session_estab) {
162 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
163 return rc;
164 }
165
166 cifs_pdu->Signature.Sequence.SequenceNumber =
167 cpu_to_le32(server->sequence_number);
168 cifs_pdu->Signature.Sequence.Reserved = 0;
169
170 *pexpected_response_sequence_number = ++server->sequence_number;
171 ++server->sequence_number;
172
173 rc = cifs_calc_signature(rqst, server, smb_signature);
174 if (rc)
175 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
176 else
177 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
178
179 return rc;
180}
181
182int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
183 __u32 *pexpected_response_sequence)
184{
185 struct smb_rqst rqst = { .rq_iov = iov,
186 .rq_nvec = n_vec };
187
188 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
189}
190
191/* must be called with server->srv_mutex held */
192int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
193 __u32 *pexpected_response_sequence_number)
194{
195 struct kvec iov[2];
196
197 iov[0].iov_base = cifs_pdu;
198 iov[0].iov_len = 4;
199 iov[1].iov_base = (char *)cifs_pdu + 4;
200 iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
201
202 return cifs_sign_smbv(iov, 2, 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 (rqst->rq_iov[0].iov_len != 4 ||
216 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
217 return -EIO;
218
219 if (cifs_pdu == NULL || server == NULL)
220 return -EINVAL;
221
222 if (!server->session_estab)
223 return 0;
224
225 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
226 struct smb_com_lock_req *pSMB =
227 (struct smb_com_lock_req *)cifs_pdu;
228 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
229 return 0;
230 }
231
232 /* BB what if signatures are supposed to be on for session but
233 server does not send one? BB */
234
235 /* Do not need to verify session setups with signature "BSRSPYL " */
236 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
237 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
238 cifs_pdu->Command);
239
240 /* save off the origiginal signature so we can modify the smb and check
241 its signature against what the server sent */
242 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
243
244 cifs_pdu->Signature.Sequence.SequenceNumber =
245 cpu_to_le32(expected_sequence_number);
246 cifs_pdu->Signature.Sequence.Reserved = 0;
247
248 mutex_lock(&server->srv_mutex);
249 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
250 mutex_unlock(&server->srv_mutex);
251
252 if (rc)
253 return rc;
254
255/* cifs_dump_mem("what we think it should be: ",
256 what_we_think_sig_should_be, 16); */
257
258 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
259 return -EACCES;
260 else
261 return 0;
262
263}
264
265/* first calculate 24 bytes ntlm response and then 16 byte session key */
266int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
267{
268 int rc = 0;
269 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
270 char temp_key[CIFS_SESS_KEY_SIZE];
271
272 if (!ses)
273 return -EINVAL;
274
275 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
276 if (!ses->auth_key.response)
277 return -ENOMEM;
278
279 ses->auth_key.len = temp_len;
280
281 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
282 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
283 if (rc) {
284 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
285 __func__, rc);
286 return rc;
287 }
288
289 rc = E_md4hash(ses->password, temp_key, nls_cp);
290 if (rc) {
291 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
292 __func__, rc);
293 return rc;
294 }
295
296 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
297 if (rc)
298 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
299 __func__, rc);
300
301 return rc;
302}
303
304#ifdef CONFIG_CIFS_WEAK_PW_HASH
305int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
306 char *lnm_session_key)
307{
308 int i, len;
309 int rc;
310 char password_with_pad[CIFS_ENCPWD_SIZE] = {0};
311
312 if (password) {
313 for (len = 0; len < CIFS_ENCPWD_SIZE; len++)
314 if (!password[len])
315 break;
316
317 memcpy(password_with_pad, password, len);
318 }
319
320 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
321 memcpy(lnm_session_key, password_with_pad,
322 CIFS_ENCPWD_SIZE);
323 return 0;
324 }
325
326 /* calculate old style session key */
327 /* calling toupper is less broken than repeatedly
328 calling nls_toupper would be since that will never
329 work for UTF8, but neither handles multibyte code pages
330 but the only alternative would be converting to UCS-16 (Unicode)
331 (using a routine something like UniStrupr) then
332 uppercasing and then converting back from Unicode - which
333 would only worth doing it if we knew it were utf8. Basically
334 utf8 and other multibyte codepages each need their own strupper
335 function since a byte at a time will ont work. */
336
337 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
338 password_with_pad[i] = toupper(password_with_pad[i]);
339
340 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
341
342 return rc;
343}
344#endif /* CIFS_WEAK_PW_HASH */
345
346/* Build a proper attribute value/target info pairs blob.
347 * Fill in netbios and dns domain name and workstation name
348 * and client time (total five av pairs and + one end of fields indicator.
349 * Allocate domain name which gets freed when session struct is deallocated.
350 */
351static int
352build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
353{
354 unsigned int dlen;
355 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
356 char *defdmname = "WORKGROUP";
357 unsigned char *blobptr;
358 struct ntlmssp2_name *attrptr;
359
360 if (!ses->domainName) {
361 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
362 if (!ses->domainName)
363 return -ENOMEM;
364 }
365
366 dlen = strlen(ses->domainName);
367
368 /*
369 * The length of this blob is two times the size of a
370 * structure (av pair) which holds name/size
371 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
372 * unicode length of a netbios domain name
373 */
374 ses->auth_key.len = size + 2 * dlen;
375 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
376 if (!ses->auth_key.response) {
377 ses->auth_key.len = 0;
378 return -ENOMEM;
379 }
380
381 blobptr = ses->auth_key.response;
382 attrptr = (struct ntlmssp2_name *) blobptr;
383
384 /*
385 * As defined in MS-NTLM 3.3.2, just this av pair field
386 * is sufficient as part of the temp
387 */
388 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
389 attrptr->length = cpu_to_le16(2 * dlen);
390 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
391 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
392
393 return 0;
394}
395
396/* Server has provided av pairs/target info in the type 2 challenge
397 * packet and we have plucked it and stored within smb session.
398 * We parse that blob here to find netbios domain name to be used
399 * as part of ntlmv2 authentication (in Target String), if not already
400 * specified on the command line.
401 * If this function returns without any error but without fetching
402 * domain name, authentication may fail against some server but
403 * may not fail against other (those who are not very particular
404 * about target string i.e. for some, just user name might suffice.
405 */
406static int
407find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
408{
409 unsigned int attrsize;
410 unsigned int type;
411 unsigned int onesize = sizeof(struct ntlmssp2_name);
412 unsigned char *blobptr;
413 unsigned char *blobend;
414 struct ntlmssp2_name *attrptr;
415
416 if (!ses->auth_key.len || !ses->auth_key.response)
417 return 0;
418
419 blobptr = ses->auth_key.response;
420 blobend = blobptr + ses->auth_key.len;
421
422 while (blobptr + onesize < blobend) {
423 attrptr = (struct ntlmssp2_name *) blobptr;
424 type = le16_to_cpu(attrptr->type);
425 if (type == NTLMSSP_AV_EOL)
426 break;
427 blobptr += 2; /* advance attr type */
428 attrsize = le16_to_cpu(attrptr->length);
429 blobptr += 2; /* advance attr size */
430 if (blobptr + attrsize > blobend)
431 break;
432 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
433 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
434 break;
435 if (!ses->domainName) {
436 ses->domainName =
437 kmalloc(attrsize + 1, GFP_KERNEL);
438 if (!ses->domainName)
439 return -ENOMEM;
440 cifs_from_utf16(ses->domainName,
441 (__le16 *)blobptr, attrsize, attrsize,
442 nls_cp, NO_MAP_UNI_RSVD);
443 break;
444 }
445 }
446 blobptr += attrsize; /* advance attr value */
447 }
448
449 return 0;
450}
451
452/* Server has provided av pairs/target info in the type 2 challenge
453 * packet and we have plucked it and stored within smb session.
454 * We parse that blob here to find the server given timestamp
455 * as part of ntlmv2 authentication (or local current time as
456 * default in case of failure)
457 */
458static __le64
459find_timestamp(struct cifs_ses *ses)
460{
461 unsigned int attrsize;
462 unsigned int type;
463 unsigned int onesize = sizeof(struct ntlmssp2_name);
464 unsigned char *blobptr;
465 unsigned char *blobend;
466 struct ntlmssp2_name *attrptr;
467 struct timespec64 ts;
468
469 if (!ses->auth_key.len || !ses->auth_key.response)
470 return 0;
471
472 blobptr = ses->auth_key.response;
473 blobend = blobptr + ses->auth_key.len;
474
475 while (blobptr + onesize < blobend) {
476 attrptr = (struct ntlmssp2_name *) blobptr;
477 type = le16_to_cpu(attrptr->type);
478 if (type == NTLMSSP_AV_EOL)
479 break;
480 blobptr += 2; /* advance attr type */
481 attrsize = le16_to_cpu(attrptr->length);
482 blobptr += 2; /* advance attr size */
483 if (blobptr + attrsize > blobend)
484 break;
485 if (type == NTLMSSP_AV_TIMESTAMP) {
486 if (attrsize == sizeof(u64))
487 return *((__le64 *)blobptr);
488 }
489 blobptr += attrsize; /* advance attr value */
490 }
491
492 ktime_get_real_ts64(&ts);
493 return cpu_to_le64(cifs_UnixTimeToNT(ts));
494}
495
496static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
497 const struct nls_table *nls_cp)
498{
499 int rc = 0;
500 int len;
501 char nt_hash[CIFS_NTHASH_SIZE];
502 __le16 *user;
503 wchar_t *domain;
504 wchar_t *server;
505
506 if (!ses->server->secmech.sdeschmacmd5) {
507 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
508 return -1;
509 }
510
511 /* calculate md4 hash of password */
512 E_md4hash(ses->password, nt_hash, nls_cp);
513
514 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
515 CIFS_NTHASH_SIZE);
516 if (rc) {
517 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
518 return rc;
519 }
520
521 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
522 if (rc) {
523 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
524 return rc;
525 }
526
527 /* convert ses->user_name to unicode */
528 len = ses->user_name ? strlen(ses->user_name) : 0;
529 user = kmalloc(2 + (len * 2), GFP_KERNEL);
530 if (user == NULL) {
531 rc = -ENOMEM;
532 return rc;
533 }
534
535 if (len) {
536 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
537 UniStrupr(user);
538 } else {
539 memset(user, '\0', 2);
540 }
541
542 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
543 (char *)user, 2 * len);
544 kfree(user);
545 if (rc) {
546 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
547 return rc;
548 }
549
550 /* convert ses->domainName to unicode and uppercase */
551 if (ses->domainName) {
552 len = strlen(ses->domainName);
553
554 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
555 if (domain == NULL) {
556 rc = -ENOMEM;
557 return rc;
558 }
559 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
560 nls_cp);
561 rc =
562 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
563 (char *)domain, 2 * len);
564 kfree(domain);
565 if (rc) {
566 cifs_dbg(VFS, "%s: Could not update with domain\n",
567 __func__);
568 return rc;
569 }
570 } else {
571 /* We use ses->serverName if no domain name available */
572 len = strlen(ses->serverName);
573
574 server = kmalloc(2 + (len * 2), GFP_KERNEL);
575 if (server == NULL) {
576 rc = -ENOMEM;
577 return rc;
578 }
579 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
580 nls_cp);
581 rc =
582 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
583 (char *)server, 2 * len);
584 kfree(server);
585 if (rc) {
586 cifs_dbg(VFS, "%s: Could not update with server\n",
587 __func__);
588 return rc;
589 }
590 }
591
592 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
593 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
601CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
602{
603 int rc;
604 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
605 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
606 unsigned int hash_len;
607
608 /* The MD5 hash starts at challenge_key.key */
609 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
610 offsetof(struct ntlmv2_resp, challenge.key[0]));
611
612 if (!ses->server->secmech.sdeschmacmd5) {
613 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
614 return -1;
615 }
616
617 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
618 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
619 if (rc) {
620 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
621 __func__);
622 return rc;
623 }
624
625 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
626 if (rc) {
627 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
628 return rc;
629 }
630
631 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
632 memcpy(ntlmv2->challenge.key,
633 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
634 else
635 memcpy(ntlmv2->challenge.key,
636 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
637 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
638 ntlmv2->challenge.key, hash_len);
639 if (rc) {
640 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
641 return rc;
642 }
643
644 /* Note that the MD5 digest over writes anon.challenge_key.key */
645 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
646 ntlmv2->ntlmv2_hash);
647 if (rc)
648 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
649
650 return rc;
651}
652
653int
654setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
655{
656 int rc;
657 int baselen;
658 unsigned int tilen;
659 struct ntlmv2_resp *ntlmv2;
660 char ntlmv2_hash[16];
661 unsigned char *tiblob = NULL; /* target info blob */
662 __le64 rsp_timestamp;
663
664 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
665 if (!ses->domainName) {
666 if (ses->domainAuto) {
667 rc = find_domain_name(ses, nls_cp);
668 if (rc) {
669 cifs_dbg(VFS, "error %d finding domain name\n",
670 rc);
671 goto setup_ntlmv2_rsp_ret;
672 }
673 } else {
674 ses->domainName = kstrdup("", GFP_KERNEL);
675 }
676 }
677 } else {
678 rc = build_avpair_blob(ses, nls_cp);
679 if (rc) {
680 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
681 goto setup_ntlmv2_rsp_ret;
682 }
683 }
684
685 /* Must be within 5 minutes of the server (or in range +/-2h
686 * in case of Mac OS X), so simply carry over server timestamp
687 * (as Windows 7 does)
688 */
689 rsp_timestamp = find_timestamp(ses);
690
691 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
692 tilen = ses->auth_key.len;
693 tiblob = ses->auth_key.response;
694
695 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
696 if (!ses->auth_key.response) {
697 rc = -ENOMEM;
698 ses->auth_key.len = 0;
699 goto setup_ntlmv2_rsp_ret;
700 }
701 ses->auth_key.len += baselen;
702
703 ntlmv2 = (struct ntlmv2_resp *)
704 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
705 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
706 ntlmv2->reserved = 0;
707 ntlmv2->time = rsp_timestamp;
708
709 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
710 ntlmv2->reserved2 = 0;
711
712 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
713
714 mutex_lock(&ses->server->srv_mutex);
715
716 rc = cifs_alloc_hash("hmac(md5)",
717 &ses->server->secmech.hmacmd5,
718 &ses->server->secmech.sdeschmacmd5);
719 if (rc) {
720 goto unlock;
721 }
722
723 /* calculate ntlmv2_hash */
724 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
725 if (rc) {
726 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
727 goto unlock;
728 }
729
730 /* calculate first part of the client response (CR1) */
731 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
732 if (rc) {
733 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
734 goto unlock;
735 }
736
737 /* now calculate the session key for NTLMv2 */
738 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
739 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
740 if (rc) {
741 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
742 __func__);
743 goto unlock;
744 }
745
746 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
747 if (rc) {
748 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
749 goto unlock;
750 }
751
752 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
753 ntlmv2->ntlmv2_hash,
754 CIFS_HMAC_MD5_HASH_SIZE);
755 if (rc) {
756 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
757 goto unlock;
758 }
759
760 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
761 ses->auth_key.response);
762 if (rc)
763 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
764
765unlock:
766 mutex_unlock(&ses->server->srv_mutex);
767setup_ntlmv2_rsp_ret:
768 kfree(tiblob);
769
770 return rc;
771}
772
773int
774calc_seckey(struct cifs_ses *ses)
775{
776 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
777 struct arc4_ctx *ctx_arc4;
778
779 if (fips_enabled)
780 return -ENODEV;
781
782 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
783
784 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
785 if (!ctx_arc4) {
786 cifs_dbg(VFS, "could not allocate arc4 context\n");
787 return -ENOMEM;
788 }
789
790 arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
791 arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
792 CIFS_CPHTXT_SIZE);
793
794 /* make secondary_key/nonce as session key */
795 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
796 /* and make len as that of session key only */
797 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
798
799 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
800 kzfree(ctx_arc4);
801 return 0;
802}
803
804void
805cifs_crypto_secmech_release(struct TCP_Server_Info *server)
806{
807 if (server->secmech.cmacaes) {
808 crypto_free_shash(server->secmech.cmacaes);
809 server->secmech.cmacaes = NULL;
810 }
811
812 if (server->secmech.hmacsha256) {
813 crypto_free_shash(server->secmech.hmacsha256);
814 server->secmech.hmacsha256 = NULL;
815 }
816
817 if (server->secmech.md5) {
818 crypto_free_shash(server->secmech.md5);
819 server->secmech.md5 = NULL;
820 }
821
822 if (server->secmech.sha512) {
823 crypto_free_shash(server->secmech.sha512);
824 server->secmech.sha512 = NULL;
825 }
826
827 if (server->secmech.hmacmd5) {
828 crypto_free_shash(server->secmech.hmacmd5);
829 server->secmech.hmacmd5 = NULL;
830 }
831
832 if (server->secmech.ccmaesencrypt) {
833 crypto_free_aead(server->secmech.ccmaesencrypt);
834 server->secmech.ccmaesencrypt = NULL;
835 }
836
837 if (server->secmech.ccmaesdecrypt) {
838 crypto_free_aead(server->secmech.ccmaesdecrypt);
839 server->secmech.ccmaesdecrypt = NULL;
840 }
841
842 kfree(server->secmech.sdesccmacaes);
843 server->secmech.sdesccmacaes = NULL;
844 kfree(server->secmech.sdeschmacsha256);
845 server->secmech.sdeschmacsha256 = NULL;
846 kfree(server->secmech.sdeschmacmd5);
847 server->secmech.sdeschmacmd5 = NULL;
848 kfree(server->secmech.sdescmd5);
849 server->secmech.sdescmd5 = NULL;
850 kfree(server->secmech.sdescsha512);
851 server->secmech.sdescsha512 = NULL;
852}