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FRV: Use generic show_interrupts()
[cris-mirror.git] / fs / cifs / cifsencrypt.c
bloba51585f9852b4627735e318e83478cbf512c9fbc
1 /*
2 * fs/cifs/cifsencrypt.c
3 *
4 * Copyright (C) International Business Machines Corp., 2005,2006
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/fs.h>
23 #include <linux/slab.h>
24 #include "cifspdu.h"
25 #include "cifsglob.h"
26 #include "cifs_debug.h"
27 #include "cifs_unicode.h"
28 #include "cifsproto.h"
29 #include "ntlmssp.h"
30 #include <linux/ctype.h>
31 #include <linux/random.h>
32
33 /* Calculate and return the CIFS signature based on the mac key and SMB PDU */
34 /* the 16 byte signature must be allocated by the caller */
35 /* Note we only use the 1st eight bytes */
36 /* Note that the smb header signature field on input contains the
37 sequence number before this function is called */
38
39 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
40 struct TCP_Server_Info *server, char *signature)
41 {
42 int rc;
43
44 if (cifs_pdu == NULL || signature == NULL || server == NULL)
45 return -EINVAL;
46
47 if (!server->secmech.sdescmd5) {
48 cERROR(1, "%s: Can't generate signature\n", __func__);
49 return -1;
50 }
51
52 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
53 if (rc) {
54 cERROR(1, "%s: Oould not init md5\n", __func__);
55 return rc;
56 }
57
58 crypto_shash_update(&server->secmech.sdescmd5->shash,
59 server->session_key.response, server->session_key.len);
60
61 crypto_shash_update(&server->secmech.sdescmd5->shash,
62 cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
63
64 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
65
66 return 0;
67 }
68
69 /* must be called with server->srv_mutex held */
70 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
71 __u32 *pexpected_response_sequence_number)
72 {
73 int rc = 0;
74 char smb_signature[20];
75
76 if ((cifs_pdu == NULL) || (server == NULL))
77 return -EINVAL;
78
79 if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
80 return rc;
81
82 cifs_pdu->Signature.Sequence.SequenceNumber =
83 cpu_to_le32(server->sequence_number);
84 cifs_pdu->Signature.Sequence.Reserved = 0;
85
86 *pexpected_response_sequence_number = server->sequence_number++;
87 server->sequence_number++;
88
89 rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
90 if (rc)
91 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
92 else
93 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
94
95 return rc;
96 }
97
98 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
99 struct TCP_Server_Info *server, char *signature)
100 {
101 int i;
102 int rc;
103
104 if (iov == NULL || signature == NULL || server == NULL)
105 return -EINVAL;
106
107 if (!server->secmech.sdescmd5) {
108 cERROR(1, "%s: Can't generate signature\n", __func__);
109 return -1;
110 }
111
112 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
113 if (rc) {
114 cERROR(1, "%s: Oould not init md5\n", __func__);
115 return rc;
116 }
117
118 crypto_shash_update(&server->secmech.sdescmd5->shash,
119 server->session_key.response, server->session_key.len);
120
121 for (i = 0; i < n_vec; i++) {
122 if (iov[i].iov_len == 0)
123 continue;
124 if (iov[i].iov_base == NULL) {
125 cERROR(1, "null iovec entry");
126 return -EIO;
127 }
128 /* The first entry includes a length field (which does not get
129 signed that occupies the first 4 bytes before the header */
130 if (i == 0) {
131 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
132 break; /* nothing to sign or corrupt header */
133 crypto_shash_update(&server->secmech.sdescmd5->shash,
134 iov[i].iov_base + 4, iov[i].iov_len - 4);
135 } else
136 crypto_shash_update(&server->secmech.sdescmd5->shash,
137 iov[i].iov_base, iov[i].iov_len);
138 }
139
140 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
141
142 return rc;
143 }
144
145 /* must be called with server->srv_mutex held */
146 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
147 __u32 *pexpected_response_sequence_number)
148 {
149 int rc = 0;
150 char smb_signature[20];
151 struct smb_hdr *cifs_pdu = iov[0].iov_base;
152
153 if ((cifs_pdu == NULL) || (server == NULL))
154 return -EINVAL;
155
156 if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
157 return rc;
158
159 cifs_pdu->Signature.Sequence.SequenceNumber =
160 cpu_to_le32(server->sequence_number);
161 cifs_pdu->Signature.Sequence.Reserved = 0;
162
163 *pexpected_response_sequence_number = server->sequence_number++;
164 server->sequence_number++;
165
166 rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
167 if (rc)
168 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
169 else
170 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
171
172 return rc;
173 }
174
175 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
176 struct TCP_Server_Info *server,
177 __u32 expected_sequence_number)
178 {
179 unsigned int rc;
180 char server_response_sig[8];
181 char what_we_think_sig_should_be[20];
182
183 if (cifs_pdu == NULL || server == NULL)
184 return -EINVAL;
185
186 if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
187 return 0;
188
189 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
190 struct smb_com_lock_req *pSMB =
191 (struct smb_com_lock_req *)cifs_pdu;
192 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
193 return 0;
194 }
195
196 /* BB what if signatures are supposed to be on for session but
197 server does not send one? BB */
198
199 /* Do not need to verify session setups with signature "BSRSPYL " */
200 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
201 cFYI(1, "dummy signature received for smb command 0x%x",
202 cifs_pdu->Command);
203
204 /* save off the origiginal signature so we can modify the smb and check
205 its signature against what the server sent */
206 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
207
208 cifs_pdu->Signature.Sequence.SequenceNumber =
209 cpu_to_le32(expected_sequence_number);
210 cifs_pdu->Signature.Sequence.Reserved = 0;
211
212 rc = cifs_calculate_signature(cifs_pdu, server,
213 what_we_think_sig_should_be);
214
215 if (rc)
216 return rc;
217
218 /* cifs_dump_mem("what we think it should be: ",
219 what_we_think_sig_should_be, 16); */
220
221 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
222 return -EACCES;
223 else
224 return 0;
225
226 }
227
228 /* first calculate 24 bytes ntlm response and then 16 byte session key */
229 int setup_ntlm_response(struct cifsSesInfo *ses)
230 {
231 int rc = 0;
232 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
233 char temp_key[CIFS_SESS_KEY_SIZE];
234
235 if (!ses)
236 return -EINVAL;
237
238 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
239 if (!ses->auth_key.response) {
240 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
241 return -ENOMEM;
242 }
243 ses->auth_key.len = temp_len;
244
245 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
246 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
247 if (rc) {
248 cFYI(1, "%s Can't generate NTLM response, error: %d",
249 __func__, rc);
250 return rc;
251 }
252
253 rc = E_md4hash(ses->password, temp_key);
254 if (rc) {
255 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
256 return rc;
257 }
258
259 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
260 if (rc)
261 cFYI(1, "%s Can't generate NTLM session key, error: %d",
262 __func__, rc);
263
264 return rc;
265 }
266
267 #ifdef CONFIG_CIFS_WEAK_PW_HASH
268 void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
269 char *lnm_session_key)
270 {
271 int i;
272 char password_with_pad[CIFS_ENCPWD_SIZE];
273
274 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
275 if (password)
276 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
277
278 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
279 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
280 memcpy(lnm_session_key, password_with_pad,
281 CIFS_ENCPWD_SIZE);
282 return;
283 }
284
285 /* calculate old style session key */
286 /* calling toupper is less broken than repeatedly
287 calling nls_toupper would be since that will never
288 work for UTF8, but neither handles multibyte code pages
289 but the only alternative would be converting to UCS-16 (Unicode)
290 (using a routine something like UniStrupr) then
291 uppercasing and then converting back from Unicode - which
292 would only worth doing it if we knew it were utf8. Basically
293 utf8 and other multibyte codepages each need their own strupper
294 function since a byte at a time will ont work. */
295
296 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
297 password_with_pad[i] = toupper(password_with_pad[i]);
298
299 SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
300
301 /* clear password before we return/free memory */
302 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
303 }
304 #endif /* CIFS_WEAK_PW_HASH */
305
306 /* Build a proper attribute value/target info pairs blob.
307 * Fill in netbios and dns domain name and workstation name
308 * and client time (total five av pairs and + one end of fields indicator.
309 * Allocate domain name which gets freed when session struct is deallocated.
310 */
311 static int
312 build_avpair_blob(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
313 {
314 unsigned int dlen;
315 unsigned int wlen;
316 unsigned int size = 6 * sizeof(struct ntlmssp2_name);
317 __le64 curtime;
318 char *defdmname = "WORKGROUP";
319 unsigned char *blobptr;
320 struct ntlmssp2_name *attrptr;
321
322 if (!ses->domainName) {
323 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
324 if (!ses->domainName)
325 return -ENOMEM;
326 }
327
328 dlen = strlen(ses->domainName);
329 wlen = strlen(ses->server->hostname);
330
331 /* The length of this blob is a size which is
332 * six times the size of a structure which holds name/size +
333 * two times the unicode length of a domain name +
334 * two times the unicode length of a server name +
335 * size of a timestamp (which is 8 bytes).
336 */
337 ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
338 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
339 if (!ses->auth_key.response) {
340 ses->auth_key.len = 0;
341 cERROR(1, "Challenge target info allocation failure");
342 return -ENOMEM;
343 }
344
345 blobptr = ses->auth_key.response;
346 attrptr = (struct ntlmssp2_name *) blobptr;
347
348 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
349 attrptr->length = cpu_to_le16(2 * dlen);
350 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
351 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
352
353 blobptr += 2 * dlen;
354 attrptr = (struct ntlmssp2_name *) blobptr;
355
356 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
357 attrptr->length = cpu_to_le16(2 * wlen);
358 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
359 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
360
361 blobptr += 2 * wlen;
362 attrptr = (struct ntlmssp2_name *) blobptr;
363
364 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
365 attrptr->length = cpu_to_le16(2 * dlen);
366 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
367 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
368
369 blobptr += 2 * dlen;
370 attrptr = (struct ntlmssp2_name *) blobptr;
371
372 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
373 attrptr->length = cpu_to_le16(2 * wlen);
374 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
375 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
376
377 blobptr += 2 * wlen;
378 attrptr = (struct ntlmssp2_name *) blobptr;
379
380 attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
381 attrptr->length = cpu_to_le16(sizeof(__le64));
382 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
383 curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
384 memcpy(blobptr, &curtime, sizeof(__le64));
385
386 return 0;
387 }
388
389 /* Server has provided av pairs/target info in the type 2 challenge
390 * packet and we have plucked it and stored within smb session.
391 * We parse that blob here to find netbios domain name to be used
392 * as part of ntlmv2 authentication (in Target String), if not already
393 * specified on the command line.
394 * If this function returns without any error but without fetching
395 * domain name, authentication may fail against some server but
396 * may not fail against other (those who are not very particular
397 * about target string i.e. for some, just user name might suffice.
398 */
399 static int
400 find_domain_name(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
401 {
402 unsigned int attrsize;
403 unsigned int type;
404 unsigned int onesize = sizeof(struct ntlmssp2_name);
405 unsigned char *blobptr;
406 unsigned char *blobend;
407 struct ntlmssp2_name *attrptr;
408
409 if (!ses->auth_key.len || !ses->auth_key.response)
410 return 0;
411
412 blobptr = ses->auth_key.response;
413 blobend = blobptr + ses->auth_key.len;
414
415 while (blobptr + onesize < blobend) {
416 attrptr = (struct ntlmssp2_name *) blobptr;
417 type = le16_to_cpu(attrptr->type);
418 if (type == NTLMSSP_AV_EOL)
419 break;
420 blobptr += 2; /* advance attr type */
421 attrsize = le16_to_cpu(attrptr->length);
422 blobptr += 2; /* advance attr size */
423 if (blobptr + attrsize > blobend)
424 break;
425 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
426 if (!attrsize)
427 break;
428 if (!ses->domainName) {
429 ses->domainName =
430 kmalloc(attrsize + 1, GFP_KERNEL);
431 if (!ses->domainName)
432 return -ENOMEM;
433 cifs_from_ucs2(ses->domainName,
434 (__le16 *)blobptr, attrsize, attrsize,
435 nls_cp, false);
436 break;
437 }
438 }
439 blobptr += attrsize; /* advance attr value */
440 }
441
442 return 0;
443 }
444
445 static int calc_ntlmv2_hash(struct cifsSesInfo *ses, char *ntlmv2_hash,
446 const struct nls_table *nls_cp)
447 {
448 int rc = 0;
449 int len;
450 char nt_hash[CIFS_NTHASH_SIZE];
451 wchar_t *user;
452 wchar_t *domain;
453 wchar_t *server;
454
455 if (!ses->server->secmech.sdeschmacmd5) {
456 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
457 return -1;
458 }
459
460 /* calculate md4 hash of password */
461 E_md4hash(ses->password, nt_hash);
462
463 crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
464 CIFS_NTHASH_SIZE);
465
466 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
467 if (rc) {
468 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
469 return rc;
470 }
471
472 /* convert ses->userName to unicode and uppercase */
473 len = strlen(ses->userName);
474 user = kmalloc(2 + (len * 2), GFP_KERNEL);
475 if (user == NULL) {
476 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
477 rc = -ENOMEM;
478 goto calc_exit_2;
479 }
480 len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
481 UniStrupr(user);
482
483 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
484 (char *)user, 2 * len);
485
486 /* convert ses->domainName to unicode and uppercase */
487 if (ses->domainName) {
488 len = strlen(ses->domainName);
489
490 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
491 if (domain == NULL) {
492 cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
493 rc = -ENOMEM;
494 goto calc_exit_1;
495 }
496 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
497 nls_cp);
498 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
499 (char *)domain, 2 * len);
500 kfree(domain);
501 } else if (ses->serverName) {
502 len = strlen(ses->serverName);
503
504 server = kmalloc(2 + (len * 2), GFP_KERNEL);
505 if (server == NULL) {
506 cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
507 rc = -ENOMEM;
508 goto calc_exit_1;
509 }
510 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
511 nls_cp);
512 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
513 (char *)server, 2 * len);
514 kfree(server);
515 }
516
517 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
518 ntlmv2_hash);
519
520 calc_exit_1:
521 kfree(user);
522 calc_exit_2:
523 return rc;
524 }
525
526 static int
527 CalcNTLMv2_response(const struct cifsSesInfo *ses, char *ntlmv2_hash)
528 {
529 int rc;
530 unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
531
532 if (!ses->server->secmech.sdeschmacmd5) {
533 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
534 return -1;
535 }
536
537 crypto_shash_setkey(ses->server->secmech.hmacmd5,
538 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
539
540 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
541 if (rc) {
542 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
543 return rc;
544 }
545
546 if (ses->server->secType == RawNTLMSSP)
547 memcpy(ses->auth_key.response + offset,
548 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
549 else
550 memcpy(ses->auth_key.response + offset,
551 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
552 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
553 ses->auth_key.response + offset, ses->auth_key.len - offset);
554
555 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
556 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
557
558 return rc;
559 }
560
561
562 int
563 setup_ntlmv2_rsp(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
564 {
565 int rc;
566 int baselen;
567 unsigned int tilen;
568 struct ntlmv2_resp *buf;
569 char ntlmv2_hash[16];
570 unsigned char *tiblob = NULL; /* target info blob */
571
572 if (ses->server->secType == RawNTLMSSP) {
573 if (!ses->domainName) {
574 rc = find_domain_name(ses, nls_cp);
575 if (rc) {
576 cERROR(1, "error %d finding domain name", rc);
577 goto setup_ntlmv2_rsp_ret;
578 }
579 }
580 } else {
581 rc = build_avpair_blob(ses, nls_cp);
582 if (rc) {
583 cERROR(1, "error %d building av pair blob", rc);
584 goto setup_ntlmv2_rsp_ret;
585 }
586 }
587
588 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
589 tilen = ses->auth_key.len;
590 tiblob = ses->auth_key.response;
591
592 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
593 if (!ses->auth_key.response) {
594 rc = ENOMEM;
595 ses->auth_key.len = 0;
596 cERROR(1, "%s: Can't allocate auth blob", __func__);
597 goto setup_ntlmv2_rsp_ret;
598 }
599 ses->auth_key.len += baselen;
600
601 buf = (struct ntlmv2_resp *)
602 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
603 buf->blob_signature = cpu_to_le32(0x00000101);
604 buf->reserved = 0;
605 buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
606 get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
607 buf->reserved2 = 0;
608
609 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
610
611 /* calculate ntlmv2_hash */
612 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
613 if (rc) {
614 cERROR(1, "could not get v2 hash rc %d", rc);
615 goto setup_ntlmv2_rsp_ret;
616 }
617
618 /* calculate first part of the client response (CR1) */
619 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
620 if (rc) {
621 cERROR(1, "Could not calculate CR1 rc: %d", rc);
622 goto setup_ntlmv2_rsp_ret;
623 }
624
625 /* now calculate the session key for NTLMv2 */
626 crypto_shash_setkey(ses->server->secmech.hmacmd5,
627 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
628
629 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
630 if (rc) {
631 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
632 goto setup_ntlmv2_rsp_ret;
633 }
634
635 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
636 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
637 CIFS_HMAC_MD5_HASH_SIZE);
638
639 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
640 ses->auth_key.response);
641
642 setup_ntlmv2_rsp_ret:
643 kfree(tiblob);
644
645 return rc;
646 }
647
648 int
649 calc_seckey(struct cifsSesInfo *ses)
650 {
651 int rc;
652 struct crypto_blkcipher *tfm_arc4;
653 struct scatterlist sgin, sgout;
654 struct blkcipher_desc desc;
655 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
656
657 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
658
659 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
660 if (IS_ERR(tfm_arc4)) {
661 rc = PTR_ERR(tfm_arc4);
662 cERROR(1, "could not allocate crypto API arc4\n");
663 return rc;
664 }
665
666 desc.tfm = tfm_arc4;
667
668 crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
669 CIFS_SESS_KEY_SIZE);
670
671 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
672 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
673
674 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
675 if (rc) {
676 cERROR(1, "could not encrypt session key rc: %d\n", rc);
677 crypto_free_blkcipher(tfm_arc4);
678 return rc;
679 }
680
681 /* make secondary_key/nonce as session key */
682 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
683 /* and make len as that of session key only */
684 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
685
686 crypto_free_blkcipher(tfm_arc4);
687
688 return 0;
689 }
690
691 void
692 cifs_crypto_shash_release(struct TCP_Server_Info *server)
693 {
694 if (server->secmech.md5)
695 crypto_free_shash(server->secmech.md5);
696
697 if (server->secmech.hmacmd5)
698 crypto_free_shash(server->secmech.hmacmd5);
699
700 kfree(server->secmech.sdeschmacmd5);
701
702 kfree(server->secmech.sdescmd5);
703 }
704
705 int
706 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
707 {
708 int rc;
709 unsigned int size;
710
711 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
712 if (IS_ERR(server->secmech.hmacmd5)) {
713 cERROR(1, "could not allocate crypto hmacmd5\n");
714 return PTR_ERR(server->secmech.hmacmd5);
715 }
716
717 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
718 if (IS_ERR(server->secmech.md5)) {
719 cERROR(1, "could not allocate crypto md5\n");
720 rc = PTR_ERR(server->secmech.md5);
721 goto crypto_allocate_md5_fail;
722 }
723
724 size = sizeof(struct shash_desc) +
725 crypto_shash_descsize(server->secmech.hmacmd5);
726 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
727 if (!server->secmech.sdeschmacmd5) {
728 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
729 rc = -ENOMEM;
730 goto crypto_allocate_hmacmd5_sdesc_fail;
731 }
732 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
733 server->secmech.sdeschmacmd5->shash.flags = 0x0;
734
735
736 size = sizeof(struct shash_desc) +
737 crypto_shash_descsize(server->secmech.md5);
738 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
739 if (!server->secmech.sdescmd5) {
740 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
741 rc = -ENOMEM;
742 goto crypto_allocate_md5_sdesc_fail;
743 }
744 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
745 server->secmech.sdescmd5->shash.flags = 0x0;
746
747 return 0;
748
749 crypto_allocate_md5_sdesc_fail:
750 kfree(server->secmech.sdeschmacmd5);
751
752 crypto_allocate_hmacmd5_sdesc_fail:
753 crypto_free_shash(server->secmech.md5);
754
755 crypto_allocate_md5_fail:
756 crypto_free_shash(server->secmech.hmacmd5);
757
758 return rc;
759 }
CRIS linux kernel tree