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cifsencrypt.c
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1 /*
2  * fs/cifs/cifsencrypt.c
3  *
4  * Copyright (C) International Business Machines Corp., 2005,2006
5  * Author(s): Steve French ([email protected])
6  *
7  * This library is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU Lesser General Public License as published
9  * by the Free Software Foundation; either version 2.1 of the License, or
10  * (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15  * the GNU Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 
22 #include <linux/fs.h>
23 #include <linux/slab.h>
24 #include "cifspdu.h"
25 #include "cifsglob.h"
26 #include "cifs_debug.h"
27 #include "cifs_unicode.h"
28 #include "cifsproto.h"
29 #include "ntlmssp.h"
30 #include <linux/ctype.h>
31 #include <linux/random.h>
32 #include <linux/highmem.h>
33 
34 /*
35  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
36  * The 16 byte signature must be allocated by the caller. Note we only use the
37  * 1st eight bytes and that the smb header signature field on input contains
38  * the sequence number before this function is called. Also, this function
39  * should be called with the server->srv_mutex held.
40  */
41 static int cifs_calc_signature(struct smb_rqst *rqst,
42  struct TCP_Server_Info *server, char *signature)
43 {
44  int i;
45  int rc;
46  struct kvec *iov = rqst->rq_iov;
47  int n_vec = rqst->rq_nvec;
48 
49  if (iov == NULL || signature == NULL || server == NULL)
50  return -EINVAL;
51 
52  if (!server->secmech.sdescmd5) {
53  cERROR(1, "%s: Can't generate signature", __func__);
54  return -1;
55  }
56 
57  rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
58  if (rc) {
59  cERROR(1, "%s: Could not init md5", __func__);
60  return rc;
61  }
62 
63  rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
64  server->session_key.response, server->session_key.len);
65  if (rc) {
66  cERROR(1, "%s: Could not update with response", __func__);
67  return rc;
68  }
69 
70  for (i = 0; i < n_vec; i++) {
71  if (iov[i].iov_len == 0)
72  continue;
73  if (iov[i].iov_base == NULL) {
74  cERROR(1, "null iovec entry");
75  return -EIO;
76  }
77  /* The first entry includes a length field (which does not get
78  signed that occupies the first 4 bytes before the header */
79  if (i == 0) {
80  if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
81  break; /* nothing to sign or corrupt header */
82  rc =
83  crypto_shash_update(&server->secmech.sdescmd5->shash,
84  iov[i].iov_base + 4, iov[i].iov_len - 4);
85  } else {
86  rc =
87  crypto_shash_update(&server->secmech.sdescmd5->shash,
88  iov[i].iov_base, iov[i].iov_len);
89  }
90  if (rc) {
91  cERROR(1, "%s: Could not update with payload",
92  __func__);
93  return rc;
94  }
95  }
96 
97  /* now hash over the rq_pages array */
98  for (i = 0; i < rqst->rq_npages; i++) {
99  struct kvec p_iov;
100 
101  cifs_rqst_page_to_kvec(rqst, i, &p_iov);
102  crypto_shash_update(&server->secmech.sdescmd5->shash,
103  p_iov.iov_base, p_iov.iov_len);
104  kunmap(rqst->rq_pages[i]);
105  }
106 
107  rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
108  if (rc)
109  cERROR(1, "%s: Could not generate md5 hash", __func__);
110 
111  return rc;
112 }
113 
114 /* must be called with server->srv_mutex held */
115 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
116  __u32 *pexpected_response_sequence_number)
117 {
118  int rc = 0;
119  char smb_signature[20];
120  struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
121 
122  if ((cifs_pdu == NULL) || (server == NULL))
123  return -EINVAL;
124 
125  if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
126  server->tcpStatus == CifsNeedNegotiate)
127  return rc;
128 
129  if (!server->session_estab) {
130  memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
131  return rc;
132  }
133 
134  cifs_pdu->Signature.Sequence.SequenceNumber =
135  cpu_to_le32(server->sequence_number);
136  cifs_pdu->Signature.Sequence.Reserved = 0;
137 
138  *pexpected_response_sequence_number = server->sequence_number++;
139  server->sequence_number++;
140 
141  rc = cifs_calc_signature(rqst, server, smb_signature);
142  if (rc)
143  memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
144  else
145  memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
146 
147  return rc;
148 }
149 
150 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
151  __u32 *pexpected_response_sequence)
152 {
153  struct smb_rqst rqst = { .rq_iov = iov,
154  .rq_nvec = n_vec };
155 
156  return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
157 }
158 
159 /* must be called with server->srv_mutex held */
160 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
161  __u32 *pexpected_response_sequence_number)
162 {
163  struct kvec iov;
164 
165  iov.iov_base = cifs_pdu;
166  iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
167 
168  return cifs_sign_smbv(&iov, 1, server,
169  pexpected_response_sequence_number);
170 }
171 
173  struct TCP_Server_Info *server,
174  __u32 expected_sequence_number)
175 {
176  unsigned int rc;
177  char server_response_sig[8];
178  char what_we_think_sig_should_be[20];
179  struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
180 
181  if (cifs_pdu == NULL || server == NULL)
182  return -EINVAL;
183 
184  if (!server->session_estab)
185  return 0;
186 
187  if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
188  struct smb_com_lock_req *pSMB =
189  (struct smb_com_lock_req *)cifs_pdu;
191  return 0;
192  }
193 
194  /* BB what if signatures are supposed to be on for session but
195  server does not send one? BB */
196 
197  /* Do not need to verify session setups with signature "BSRSPYL " */
198  if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
199  cFYI(1, "dummy signature received for smb command 0x%x",
200  cifs_pdu->Command);
201 
202  /* save off the origiginal signature so we can modify the smb and check
203  its signature against what the server sent */
204  memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
205 
206  cifs_pdu->Signature.Sequence.SequenceNumber =
207  cpu_to_le32(expected_sequence_number);
208  cifs_pdu->Signature.Sequence.Reserved = 0;
209 
210  mutex_lock(&server->srv_mutex);
211  rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
212  mutex_unlock(&server->srv_mutex);
213 
214  if (rc)
215  return rc;
216 
217 /* cifs_dump_mem("what we think it should be: ",
218  what_we_think_sig_should_be, 16); */
219 
220  if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
221  return -EACCES;
222  else
223  return 0;
224 
225 }
226 
227 /* first calculate 24 bytes ntlm response and then 16 byte session key */
228 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
229 {
230  int rc = 0;
231  unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
232  char temp_key[CIFS_SESS_KEY_SIZE];
233 
234  if (!ses)
235  return -EINVAL;
236 
237  ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
238  if (!ses->auth_key.response) {
239  cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
240  return -ENOMEM;
241  }
242  ses->auth_key.len = temp_len;
243 
244  rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
245  ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
246  if (rc) {
247  cFYI(1, "%s Can't generate NTLM response, error: %d",
248  __func__, rc);
249  return rc;
250  }
251 
252  rc = E_md4hash(ses->password, temp_key, nls_cp);
253  if (rc) {
254  cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
255  return rc;
256  }
257 
258  rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
259  if (rc)
260  cFYI(1, "%s Can't generate NTLM session key, error: %d",
261  __func__, rc);
262 
263  return rc;
264 }
265 
266 #ifdef CONFIG_CIFS_WEAK_PW_HASH
267 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
268  char *lnm_session_key)
269 {
270  int i;
271  int rc;
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,
282  return 0;
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  rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
300 
301  return rc;
302 }
303 #endif /* CIFS_WEAK_PW_HASH */
304 
305 /* Build a proper attribute value/target info pairs blob.
306  * Fill in netbios and dns domain name and workstation name
307  * and client time (total five av pairs and + one end of fields indicator.
308  * Allocate domain name which gets freed when session struct is deallocated.
309  */
310 static int
311 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
312 {
313  unsigned int dlen;
314  unsigned int size = 2 * sizeof(struct ntlmssp2_name);
315  char *defdmname = "WORKGROUP";
316  unsigned char *blobptr;
317  struct ntlmssp2_name *attrptr;
318 
319  if (!ses->domainName) {
320  ses->domainName = kstrdup(defdmname, GFP_KERNEL);
321  if (!ses->domainName)
322  return -ENOMEM;
323  }
324 
325  dlen = strlen(ses->domainName);
326 
327  /*
328  * The length of this blob is two times the size of a
329  * structure (av pair) which holds name/size
330  * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
331  * unicode length of a netbios domain name
332  */
333  ses->auth_key.len = size + 2 * dlen;
334  ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
335  if (!ses->auth_key.response) {
336  ses->auth_key.len = 0;
337  cERROR(1, "Challenge target info allocation failure");
338  return -ENOMEM;
339  }
340 
341  blobptr = ses->auth_key.response;
342  attrptr = (struct ntlmssp2_name *) blobptr;
343 
344  /*
345  * As defined in MS-NTLM 3.3.2, just this av pair field
346  * is sufficient as part of the temp
347  */
349  attrptr->length = cpu_to_le16(2 * dlen);
350  blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
351  cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
352 
353  return 0;
354 }
355 
356 /* Server has provided av pairs/target info in the type 2 challenge
357  * packet and we have plucked it and stored within smb session.
358  * We parse that blob here to find netbios domain name to be used
359  * as part of ntlmv2 authentication (in Target String), if not already
360  * specified on the command line.
361  * If this function returns without any error but without fetching
362  * domain name, authentication may fail against some server but
363  * may not fail against other (those who are not very particular
364  * about target string i.e. for some, just user name might suffice.
365  */
366 static int
367 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
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 
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_NB_DOMAIN_NAME) {
393  if (!attrsize)
394  break;
395  if (!ses->domainName) {
396  ses->domainName =
397  kmalloc(attrsize + 1, GFP_KERNEL);
398  if (!ses->domainName)
399  return -ENOMEM;
401  (__le16 *)blobptr, attrsize, attrsize,
402  nls_cp, false);
403  break;
404  }
405  }
406  blobptr += attrsize; /* advance attr value */
407  }
408 
409  return 0;
410 }
411 
412 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
413  const struct nls_table *nls_cp)
414 {
415  int rc = 0;
416  int len;
417  char nt_hash[CIFS_NTHASH_SIZE];
418  wchar_t *user;
419  wchar_t *domain;
420  wchar_t *server;
421 
422  if (!ses->server->secmech.sdeschmacmd5) {
423  cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash");
424  return -1;
425  }
426 
427  /* calculate md4 hash of password */
428  E_md4hash(ses->password, nt_hash, nls_cp);
429 
430  rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
432  if (rc) {
433  cERROR(1, "%s: Could not set NT Hash as a key", __func__);
434  return rc;
435  }
436 
437  rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
438  if (rc) {
439  cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5");
440  return rc;
441  }
442 
443  /* convert ses->user_name to unicode and uppercase */
444  len = ses->user_name ? strlen(ses->user_name) : 0;
445  user = kmalloc(2 + (len * 2), GFP_KERNEL);
446  if (user == NULL) {
447  cERROR(1, "calc_ntlmv2_hash: user mem alloc failure");
448  rc = -ENOMEM;
449  return rc;
450  }
451 
452  if (len) {
453  len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp);
454  UniStrupr(user);
455  } else {
456  memset(user, '\0', 2);
457  }
458 
459  rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
460  (char *)user, 2 * len);
461  kfree(user);
462  if (rc) {
463  cERROR(1, "%s: Could not update with user", __func__);
464  return rc;
465  }
466 
467  /* convert ses->domainName to unicode and uppercase */
468  if (ses->domainName) {
469  len = strlen(ses->domainName);
470 
471  domain = kmalloc(2 + (len * 2), GFP_KERNEL);
472  if (domain == NULL) {
473  cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
474  rc = -ENOMEM;
475  return rc;
476  }
477  len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
478  nls_cp);
479  rc =
480  crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
481  (char *)domain, 2 * len);
482  kfree(domain);
483  if (rc) {
484  cERROR(1, "%s: Could not update with domain",
485  __func__);
486  return rc;
487  }
488  } else if (ses->serverName) {
489  len = strlen(ses->serverName);
490 
491  server = kmalloc(2 + (len * 2), GFP_KERNEL);
492  if (server == NULL) {
493  cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
494  rc = -ENOMEM;
495  return rc;
496  }
497  len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
498  nls_cp);
499  rc =
500  crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
501  (char *)server, 2 * len);
502  kfree(server);
503  if (rc) {
504  cERROR(1, "%s: Could not update with server",
505  __func__);
506  return rc;
507  }
508  }
509 
510  rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
511  ntlmv2_hash);
512  if (rc)
513  cERROR(1, "%s: Could not generate md5 hash", __func__);
514 
515  return rc;
516 }
517 
518 static int
519 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
520 {
521  int rc;
522  unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
523 
524  if (!ses->server->secmech.sdeschmacmd5) {
525  cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash");
526  return -1;
527  }
528 
529  rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
530  ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
531  if (rc) {
532  cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
533  return rc;
534  }
535 
536  rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
537  if (rc) {
538  cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
539  return rc;
540  }
541 
542  if (ses->server->secType == RawNTLMSSP)
543  memcpy(ses->auth_key.response + offset,
544  ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
545  else
546  memcpy(ses->auth_key.response + offset,
547  ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
548  rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
549  ses->auth_key.response + offset, ses->auth_key.len - offset);
550  if (rc) {
551  cERROR(1, "%s: Could not update with response", __func__);
552  return rc;
553  }
554 
555  rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
556  ses->auth_key.response + CIFS_SESS_KEY_SIZE);
557  if (rc)
558  cERROR(1, "%s: Could not generate md5 hash", __func__);
559 
560  return rc;
561 }
562 
563 
564 int
565 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
566 {
567  int rc;
568  int baselen;
569  unsigned int tilen;
570  struct ntlmv2_resp *buf;
571  char ntlmv2_hash[16];
572  unsigned char *tiblob = NULL; /* target info blob */
573 
574  if (ses->server->secType == RawNTLMSSP) {
575  if (!ses->domainName) {
576  rc = find_domain_name(ses, nls_cp);
577  if (rc) {
578  cERROR(1, "error %d finding domain name", rc);
579  goto setup_ntlmv2_rsp_ret;
580  }
581  }
582  } else {
583  rc = build_avpair_blob(ses, nls_cp);
584  if (rc) {
585  cERROR(1, "error %d building av pair blob", rc);
586  goto setup_ntlmv2_rsp_ret;
587  }
588  }
589 
590  baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
591  tilen = ses->auth_key.len;
592  tiblob = ses->auth_key.response;
593 
594  ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
595  if (!ses->auth_key.response) {
596  rc = ENOMEM;
597  ses->auth_key.len = 0;
598  cERROR(1, "%s: Can't allocate auth blob", __func__);
599  goto setup_ntlmv2_rsp_ret;
600  }
601  ses->auth_key.len += baselen;
602 
603  buf = (struct ntlmv2_resp *)
604  (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
605  buf->blob_signature = cpu_to_le32(0x00000101);
606  buf->reserved = 0;
608  get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
609  buf->reserved2 = 0;
610 
611  memcpy(ses->auth_key.response + baselen, tiblob, tilen);
612 
613  /* calculate ntlmv2_hash */
614  rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
615  if (rc) {
616  cERROR(1, "could not get v2 hash rc %d", rc);
617  goto setup_ntlmv2_rsp_ret;
618  }
619 
620  /* calculate first part of the client response (CR1) */
621  rc = CalcNTLMv2_response(ses, ntlmv2_hash);
622  if (rc) {
623  cERROR(1, "Could not calculate CR1 rc: %d", rc);
624  goto setup_ntlmv2_rsp_ret;
625  }
626 
627  /* now calculate the session key for NTLMv2 */
628  rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
629  ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
630  if (rc) {
631  cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
632  goto setup_ntlmv2_rsp_ret;
633  }
634 
635  rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
636  if (rc) {
637  cERROR(1, "%s: Could not init hmacmd5", __func__);
638  goto setup_ntlmv2_rsp_ret;
639  }
640 
641  rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
642  ses->auth_key.response + CIFS_SESS_KEY_SIZE,
644  if (rc) {
645  cERROR(1, "%s: Could not update with response", __func__);
646  goto setup_ntlmv2_rsp_ret;
647  }
648 
649  rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
650  ses->auth_key.response);
651  if (rc)
652  cERROR(1, "%s: Could not generate md5 hash", __func__);
653 
654 setup_ntlmv2_rsp_ret:
655  kfree(tiblob);
656 
657  return rc;
658 }
659 
660 int
661 calc_seckey(struct cifs_ses *ses)
662 {
663  int rc;
664  struct crypto_blkcipher *tfm_arc4;
665  struct scatterlist sgin, sgout;
666  struct blkcipher_desc desc;
667  unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
668 
670 
671  tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
672  if (IS_ERR(tfm_arc4)) {
673  rc = PTR_ERR(tfm_arc4);
674  cERROR(1, "could not allocate crypto API arc4");
675  return rc;
676  }
677 
678  desc.tfm = tfm_arc4;
679 
680  rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
682  if (rc) {
683  cERROR(1, "%s: Could not set response as a key", __func__);
684  return rc;
685  }
686 
687  sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
688  sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
689 
690  rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
691  if (rc) {
692  cERROR(1, "could not encrypt session key rc: %d", rc);
693  crypto_free_blkcipher(tfm_arc4);
694  return rc;
695  }
696 
697  /* make secondary_key/nonce as session key */
698  memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
699  /* and make len as that of session key only */
700  ses->auth_key.len = CIFS_SESS_KEY_SIZE;
701 
702  crypto_free_blkcipher(tfm_arc4);
703 
704  return rc;
705 }
706 
707 void
709 {
710  if (server->secmech.hmacsha256)
711  crypto_free_shash(server->secmech.hmacsha256);
712 
713  if (server->secmech.md5)
714  crypto_free_shash(server->secmech.md5);
715 
716  if (server->secmech.hmacmd5)
717  crypto_free_shash(server->secmech.hmacmd5);
718 
719  kfree(server->secmech.sdeschmacsha256);
720 
721  kfree(server->secmech.sdeschmacmd5);
722 
723  kfree(server->secmech.sdescmd5);
724 }
725 
726 int
728 {
729  int rc;
730  unsigned int size;
731 
732  server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
733  if (IS_ERR(server->secmech.hmacmd5)) {
734  cERROR(1, "could not allocate crypto hmacmd5");
735  return PTR_ERR(server->secmech.hmacmd5);
736  }
737 
738  server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
739  if (IS_ERR(server->secmech.md5)) {
740  cERROR(1, "could not allocate crypto md5");
741  rc = PTR_ERR(server->secmech.md5);
742  goto crypto_allocate_md5_fail;
743  }
744 
745  server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
746  if (IS_ERR(server->secmech.hmacsha256)) {
747  cERROR(1, "could not allocate crypto hmacsha256\n");
748  rc = PTR_ERR(server->secmech.hmacsha256);
749  goto crypto_allocate_hmacsha256_fail;
750  }
751 
752  size = sizeof(struct shash_desc) +
753  crypto_shash_descsize(server->secmech.hmacmd5);
754  server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
755  if (!server->secmech.sdeschmacmd5) {
756  cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5");
757  rc = -ENOMEM;
758  goto crypto_allocate_hmacmd5_sdesc_fail;
759  }
760  server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
761  server->secmech.sdeschmacmd5->shash.flags = 0x0;
762 
763  size = sizeof(struct shash_desc) +
764  crypto_shash_descsize(server->secmech.md5);
765  server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
766  if (!server->secmech.sdescmd5) {
767  cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5");
768  rc = -ENOMEM;
769  goto crypto_allocate_md5_sdesc_fail;
770  }
771  server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
772  server->secmech.sdescmd5->shash.flags = 0x0;
773 
774  size = sizeof(struct shash_desc) +
775  crypto_shash_descsize(server->secmech.hmacsha256);
776  server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
777  if (!server->secmech.sdeschmacsha256) {
778  cERROR(1, "%s: Can't alloc hmacsha256\n", __func__);
779  rc = -ENOMEM;
780  goto crypto_allocate_hmacsha256_sdesc_fail;
781  }
782  server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256;
783  server->secmech.sdeschmacsha256->shash.flags = 0x0;
784 
785  return 0;
786 
787 crypto_allocate_hmacsha256_sdesc_fail:
788  kfree(server->secmech.sdescmd5);
789 
790 crypto_allocate_md5_sdesc_fail:
791  kfree(server->secmech.sdeschmacmd5);
792 
793 crypto_allocate_hmacmd5_sdesc_fail:
794  crypto_free_shash(server->secmech.hmacsha256);
795 
796 crypto_allocate_hmacsha256_fail:
797  crypto_free_shash(server->secmech.md5);
798 
799 crypto_allocate_md5_fail:
800  crypto_free_shash(server->secmech.hmacmd5);
801 
802  return rc;
803 }