fs/cifs/cifsencrypt.c

   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 /*
  34  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
  35  * The 16 byte signature must be allocated by the caller. Note we only use the
  36  * 1st eight bytes and that the smb header signature field on input contains
  37  * the sequence number before this function is called. Also, this function
  38  * should be called with the server->srv_mutex held.
  39  */
  40 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
  41                                 struct TCP_Server_Info *server, char *signature)
  42 {
  43         int rc;
  44
  45         if (cifs_pdu == NULL || signature == NULL || server == NULL)
  46                 return -EINVAL;
  47
  48         if (!server->secmech.sdescmd5) {
  49                 cERROR(1, "%s: Can't generate signature\n", __func__);
  50                 return -1;
  51         }
  52
  53         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  54         if (rc) {
  55                 cERROR(1, "%s: Oould not init md5\n", __func__);
  56                 return rc;
  57         }
  58
  59         crypto_shash_update(&server->secmech.sdescmd5->shash,
  60                 server->session_key.response, server->session_key.len);
  61
  62         crypto_shash_update(&server->secmech.sdescmd5->shash,
  63                 cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
  64
  65         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
  66
  67         return 0;
  68 }
  69
  70 /* must be called with server->srv_mutex held */
  71 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
  72                   __u32 *pexpected_response_sequence_number)
  73 {
  74         int rc = 0;
  75         char smb_signature[20];
  76
  77         if ((cifs_pdu == NULL) || (server == NULL))
  78                 return -EINVAL;
  79
  80         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
  81                 return rc;
  82
  83         cifs_pdu->Signature.Sequence.SequenceNumber =
  84                         cpu_to_le32(server->sequence_number);
  85         cifs_pdu->Signature.Sequence.Reserved = 0;
  86
  87         *pexpected_response_sequence_number = server->sequence_number++;
  88         server->sequence_number++;
  89
  90         rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
  91         if (rc)
  92                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
  93         else
  94                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
  95
  96         return rc;
  97 }
  98
  99 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 100                                 struct TCP_Server_Info *server, char *signature)
 101 {
 102         int i;
 103         int rc;
 104
 105         if (iov == NULL || signature == NULL || server == NULL)
 106                 return -EINVAL;
 107
 108         if (!server->secmech.sdescmd5) {
 109                 cERROR(1, "%s: Can't generate signature\n", __func__);
 110                 return -1;
 111         }
 112
 113         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 114         if (rc) {
 115                 cERROR(1, "%s: Oould not init md5\n", __func__);
 116                 return rc;
 117         }
 118
 119         crypto_shash_update(&server->secmech.sdescmd5->shash,
 120                 server->session_key.response, server->session_key.len);
 121
 122         for (i = 0; i < n_vec; i++) {
 123                 if (iov[i].iov_len == 0)
 124                         continue;
 125                 if (iov[i].iov_base == NULL) {
 126                         cERROR(1, "null iovec entry");
 127                         return -EIO;
 128                 }
 129                 /* The first entry includes a length field (which does not get
 130                    signed that occupies the first 4 bytes before the header */
 131                 if (i == 0) {
 132                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 133                                 break; /* nothing to sign or corrupt header */
 134                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 135                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 136                 } else
 137                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 138                                 iov[i].iov_base, iov[i].iov_len);
 139         }
 140
 141         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 142
 143         return rc;
 144 }
 145
 146 /* must be called with server->srv_mutex held */
 147 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 148                    __u32 *pexpected_response_sequence_number)
 149 {
 150         int rc = 0;
 151         char smb_signature[20];
 152         struct smb_hdr *cifs_pdu = iov[0].iov_base;
 153
 154         if ((cifs_pdu == NULL) || (server == NULL))
 155                 return -EINVAL;
 156
 157         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
 158                 return rc;
 159
 160         cifs_pdu->Signature.Sequence.SequenceNumber =
 161                                 cpu_to_le32(server->sequence_number);
 162         cifs_pdu->Signature.Sequence.Reserved = 0;
 163
 164         *pexpected_response_sequence_number = server->sequence_number++;
 165         server->sequence_number++;
 166
 167         rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
 168         if (rc)
 169                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 170         else
 171                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 172
 173         return rc;
 174 }
 175
 176 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 177                           struct TCP_Server_Info *server,
 178                           __u32 expected_sequence_number)
 179 {
 180         unsigned int rc;
 181         char server_response_sig[8];
 182         char what_we_think_sig_should_be[20];
 183
 184         if (cifs_pdu == NULL || server == NULL)
 185                 return -EINVAL;
 186
 187         if (!server->session_estab)
 188                 return 0;
 189
 190         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 191                 struct smb_com_lock_req *pSMB =
 192                         (struct smb_com_lock_req *)cifs_pdu;
 193             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 194                         return 0;
 195         }
 196
 197         /* BB what if signatures are supposed to be on for session but
 198            server does not send one? BB */
 199
 200         /* Do not need to verify session setups with signature "BSRSPYL "  */
 201         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 202                 cFYI(1, "dummy signature received for smb command 0x%x",
 203                         cifs_pdu->Command);
 204
 205         /* save off the origiginal signature so we can modify the smb and check
 206                 its signature against what the server sent */
 207         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 208
 209         cifs_pdu->Signature.Sequence.SequenceNumber =
 210                                         cpu_to_le32(expected_sequence_number);
 211         cifs_pdu->Signature.Sequence.Reserved = 0;
 212
 213         mutex_lock(&server->srv_mutex);
 214         rc = cifs_calculate_signature(cifs_pdu, server,
 215                 what_we_think_sig_should_be);
 216         mutex_unlock(&server->srv_mutex);
 217
 218         if (rc)
 219                 return rc;
 220
 221 /*      cifs_dump_mem("what we think it should be: ",
 222                       what_we_think_sig_should_be, 16); */
 223
 224         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 225                 return -EACCES;
 226         else
 227                 return 0;
 228
 229 }
 230
 231 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 232 int setup_ntlm_response(struct cifs_ses *ses)
 233 {
 234         int rc = 0;
 235         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 236         char temp_key[CIFS_SESS_KEY_SIZE];
 237
 238         if (!ses)
 239                 return -EINVAL;
 240
 241         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 242         if (!ses->auth_key.response) {
 243                 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 244                 return -ENOMEM;
 245         }
 246         ses->auth_key.len = temp_len;
 247
 248         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 249                         ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 250         if (rc) {
 251                 cFYI(1, "%s Can't generate NTLM response, error: %d",
 252                         __func__, rc);
 253                 return rc;
 254         }
 255
 256         rc = E_md4hash(ses->password, temp_key);
 257         if (rc) {
 258                 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
 259                 return rc;
 260         }
 261
 262         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 263         if (rc)
 264                 cFYI(1, "%s Can't generate NTLM session key, error: %d",
 265                         __func__, rc);
 266
 267         return rc;
 268 }
 269
 270 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 271 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 272                         char *lnm_session_key)
 273 {
 274         int i;
 275         int rc;
 276         char password_with_pad[CIFS_ENCPWD_SIZE];
 277
 278         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 279         if (password)
 280                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 281
 282         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 283                 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 284                 memcpy(lnm_session_key, password_with_pad,
 285                         CIFS_ENCPWD_SIZE);
 286                 return 0;
 287         }
 288
 289         /* calculate old style session key */
 290         /* calling toupper is less broken than repeatedly
 291         calling nls_toupper would be since that will never
 292         work for UTF8, but neither handles multibyte code pages
 293         but the only alternative would be converting to UCS-16 (Unicode)
 294         (using a routine something like UniStrupr) then
 295         uppercasing and then converting back from Unicode - which
 296         would only worth doing it if we knew it were utf8. Basically
 297         utf8 and other multibyte codepages each need their own strupper
 298         function since a byte at a time will ont work. */
 299
 300         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 301                 password_with_pad[i] = toupper(password_with_pad[i]);
 302
 303         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 304
 305         return rc;
 306 }
 307 #endif /* CIFS_WEAK_PW_HASH */
 308
 309 /* Build a proper attribute value/target info pairs blob.
 310  * Fill in netbios and dns domain name and workstation name
 311  * and client time (total five av pairs and + one end of fields indicator.
 312  * Allocate domain name which gets freed when session struct is deallocated.
 313  */
 314 static int
 315 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 316 {
 317         unsigned int dlen;
 318         unsigned int wlen;
 319         unsigned int size = 6 * sizeof(struct ntlmssp2_name);
 320         __le64  curtime;
 321         char *defdmname = "WORKGROUP";
 322         unsigned char *blobptr;
 323         struct ntlmssp2_name *attrptr;
 324
 325         if (!ses->domainName) {
 326                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 327                 if (!ses->domainName)
 328                         return -ENOMEM;
 329         }
 330
 331         dlen = strlen(ses->domainName);
 332         wlen = strlen(ses->server->hostname);
 333
 334         /* The length of this blob is a size which is
 335          * six times the size of a structure which holds name/size +
 336          * two times the unicode length of a domain name +
 337          * two times the unicode length of a server name +
 338          * size of a timestamp (which is 8 bytes).
 339          */
 340         ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
 341         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 342         if (!ses->auth_key.response) {
 343                 ses->auth_key.len = 0;
 344                 cERROR(1, "Challenge target info allocation failure");
 345                 return -ENOMEM;
 346         }
 347
 348         blobptr = ses->auth_key.response;
 349         attrptr = (struct ntlmssp2_name *) blobptr;
 350
 351         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 352         attrptr->length = cpu_to_le16(2 * dlen);
 353         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 354         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 355
 356         blobptr += 2 * dlen;
 357         attrptr = (struct ntlmssp2_name *) blobptr;
 358
 359         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
 360         attrptr->length = cpu_to_le16(2 * wlen);
 361         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 362         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 363
 364         blobptr += 2 * wlen;
 365         attrptr = (struct ntlmssp2_name *) blobptr;
 366
 367         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
 368         attrptr->length = cpu_to_le16(2 * dlen);
 369         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 370         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 371
 372         blobptr += 2 * dlen;
 373         attrptr = (struct ntlmssp2_name *) blobptr;
 374
 375         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
 376         attrptr->length = cpu_to_le16(2 * wlen);
 377         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 378         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 379
 380         blobptr += 2 * wlen;
 381         attrptr = (struct ntlmssp2_name *) blobptr;
 382
 383         attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
 384         attrptr->length = cpu_to_le16(sizeof(__le64));
 385         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 386         curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 387         memcpy(blobptr, &curtime, sizeof(__le64));
 388
 389         return 0;
 390 }
 391
 392 /* Server has provided av pairs/target info in the type 2 challenge
 393  * packet and we have plucked it and stored within smb session.
 394  * We parse that blob here to find netbios domain name to be used
 395  * as part of ntlmv2 authentication (in Target String), if not already
 396  * specified on the command line.
 397  * If this function returns without any error but without fetching
 398  * domain name, authentication may fail against some server but
 399  * may not fail against other (those who are not very particular
 400  * about target string i.e. for some, just user name might suffice.
 401  */
 402 static int
 403 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 404 {
 405         unsigned int attrsize;
 406         unsigned int type;
 407         unsigned int onesize = sizeof(struct ntlmssp2_name);
 408         unsigned char *blobptr;
 409         unsigned char *blobend;
 410         struct ntlmssp2_name *attrptr;
 411
 412         if (!ses->auth_key.len || !ses->auth_key.response)
 413                 return 0;
 414
 415         blobptr = ses->auth_key.response;
 416         blobend = blobptr + ses->auth_key.len;
 417
 418         while (blobptr + onesize < blobend) {
 419                 attrptr = (struct ntlmssp2_name *) blobptr;
 420                 type = le16_to_cpu(attrptr->type);
 421                 if (type == NTLMSSP_AV_EOL)
 422                         break;
 423                 blobptr += 2; /* advance attr type */
 424                 attrsize = le16_to_cpu(attrptr->length);
 425                 blobptr += 2; /* advance attr size */
 426                 if (blobptr + attrsize > blobend)
 427                         break;
 428                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 429                         if (!attrsize)
 430                                 break;
 431                         if (!ses->domainName) {
 432                                 ses->domainName =
 433                                         kmalloc(attrsize + 1, GFP_KERNEL);
 434                                 if (!ses->domainName)
 435                                                 return -ENOMEM;
 436                                 cifs_from_ucs2(ses->domainName,
 437                                         (__le16 *)blobptr, attrsize, attrsize,
 438                                         nls_cp, false);
 439                                 break;
 440                         }
 441                 }
 442                 blobptr += attrsize; /* advance attr  value */
 443         }
 444
 445         return 0;
 446 }
 447
 448 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 449                             const struct nls_table *nls_cp)
 450 {
 451         int rc = 0;
 452         int len;
 453         char nt_hash[CIFS_NTHASH_SIZE];
 454         wchar_t *user;
 455         wchar_t *domain;
 456         wchar_t *server;
 457
 458         if (!ses->server->secmech.sdeschmacmd5) {
 459                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 460                 return -1;
 461         }
 462
 463         /* calculate md4 hash of password */
 464         E_md4hash(ses->password, nt_hash);
 465
 466         crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 467                                 CIFS_NTHASH_SIZE);
 468
 469         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 470         if (rc) {
 471                 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
 472                 return rc;
 473         }
 474
 475         /* convert ses->user_name to unicode and uppercase */
 476         len = strlen(ses->user_name);
 477         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 478         if (user == NULL) {
 479                 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
 480                 rc = -ENOMEM;
 481                 goto calc_exit_2;
 482         }
 483         len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
 484         UniStrupr(user);
 485
 486         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 487                                 (char *)user, 2 * len);
 488
 489         /* convert ses->domainName to unicode and uppercase */
 490         if (ses->domainName) {
 491                 len = strlen(ses->domainName);
 492
 493                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 494                 if (domain == NULL) {
 495                         cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 496                         rc = -ENOMEM;
 497                         goto calc_exit_1;
 498                 }
 499                 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
 500                                         nls_cp);
 501                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 502                                         (char *)domain, 2 * len);
 503                 kfree(domain);
 504         } else if (ses->serverName) {
 505                 len = strlen(ses->serverName);
 506
 507                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 508                 if (server == NULL) {
 509                         cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 510                         rc = -ENOMEM;
 511                         goto calc_exit_1;
 512                 }
 513                 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
 514                                         nls_cp);
 515                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 516                                         (char *)server, 2 * len);
 517                 kfree(server);
 518         }
 519
 520         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 521                                         ntlmv2_hash);
 522
 523 calc_exit_1:
 524         kfree(user);
 525 calc_exit_2:
 526         return rc;
 527 }
 528
 529 static int
 530 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 531 {
 532         int rc;
 533         unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 534
 535         if (!ses->server->secmech.sdeschmacmd5) {
 536                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 537                 return -1;
 538         }
 539
 540         crypto_shash_setkey(ses->server->secmech.hmacmd5,
 541                                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 542
 543         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 544         if (rc) {
 545                 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 546                 return rc;
 547         }
 548
 549         if (ses->server->secType == RawNTLMSSP)
 550                 memcpy(ses->auth_key.response + offset,
 551                         ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 552         else
 553                 memcpy(ses->auth_key.response + offset,
 554                         ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 555         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 556                 ses->auth_key.response + offset, ses->auth_key.len - offset);
 557
 558         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 559                 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 560
 561         return rc;
 562 }
 563
 564
 565 int
 566 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 567 {
 568         int rc;
 569         int baselen;
 570         unsigned int tilen;
 571         struct ntlmv2_resp *buf;
 572         char ntlmv2_hash[16];
 573         unsigned char *tiblob = NULL; /* target info blob */
 574
 575         if (ses->server->secType == RawNTLMSSP) {
 576                 if (!ses->domainName) {
 577                         rc = find_domain_name(ses, nls_cp);
 578                         if (rc) {
 579                                 cERROR(1, "error %d finding domain name", rc);
 580                                 goto setup_ntlmv2_rsp_ret;
 581                         }
 582                 }
 583         } else {
 584                 rc = build_avpair_blob(ses, nls_cp);
 585                 if (rc) {
 586                         cERROR(1, "error %d building av pair blob", rc);
 587                         goto setup_ntlmv2_rsp_ret;
 588                 }
 589         }
 590
 591         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 592         tilen = ses->auth_key.len;
 593         tiblob = ses->auth_key.response;
 594
 595         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 596         if (!ses->auth_key.response) {
 597                 rc = ENOMEM;
 598                 ses->auth_key.len = 0;
 599                 cERROR(1, "%s: Can't allocate auth blob", __func__);
 600                 goto setup_ntlmv2_rsp_ret;
 601         }
 602         ses->auth_key.len += baselen;
 603
 604         buf = (struct ntlmv2_resp *)
 605                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 606         buf->blob_signature = cpu_to_le32(0x00000101);
 607         buf->reserved = 0;
 608         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 609         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 610         buf->reserved2 = 0;
 611
 612         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 613
 614         /* calculate ntlmv2_hash */
 615         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 616         if (rc) {
 617                 cERROR(1, "could not get v2 hash rc %d", rc);
 618                 goto setup_ntlmv2_rsp_ret;
 619         }
 620
 621         /* calculate first part of the client response (CR1) */
 622         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 623         if (rc) {
 624                 cERROR(1, "Could not calculate CR1  rc: %d", rc);
 625                 goto setup_ntlmv2_rsp_ret;
 626         }
 627
 628         /* now calculate the session key for NTLMv2 */
 629         crypto_shash_setkey(ses->server->secmech.hmacmd5,
 630                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 631
 632         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 633         if (rc) {
 634                 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
 635                 goto setup_ntlmv2_rsp_ret;
 636         }
 637
 638         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 639                 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 640                 CIFS_HMAC_MD5_HASH_SIZE);
 641
 642         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 643                 ses->auth_key.response);
 644
 645 setup_ntlmv2_rsp_ret:
 646         kfree(tiblob);
 647
 648         return rc;
 649 }
 650
 651 int
 652 calc_seckey(struct cifs_ses *ses)
 653 {
 654         int rc;
 655         struct crypto_blkcipher *tfm_arc4;
 656         struct scatterlist sgin, sgout;
 657         struct blkcipher_desc desc;
 658         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 659
 660         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 661
 662         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 663         if (IS_ERR(tfm_arc4)) {
 664                 rc = PTR_ERR(tfm_arc4);
 665                 cERROR(1, "could not allocate crypto API arc4\n");
 666                 return rc;
 667         }
 668
 669         desc.tfm = tfm_arc4;
 670
 671         crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 672                                         CIFS_SESS_KEY_SIZE);
 673
 674         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 675         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 676
 677         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 678         if (rc) {
 679                 cERROR(1, "could not encrypt session key rc: %d\n", rc);
 680                 crypto_free_blkcipher(tfm_arc4);
 681                 return rc;
 682         }
 683
 684         /* make secondary_key/nonce as session key */
 685         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 686         /* and make len as that of session key only */
 687         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 688
 689         crypto_free_blkcipher(tfm_arc4);
 690
 691         return 0;
 692 }
 693
 694 void
 695 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 696 {
 697         if (server->secmech.md5)
 698                 crypto_free_shash(server->secmech.md5);
 699
 700         if (server->secmech.hmacmd5)
 701                 crypto_free_shash(server->secmech.hmacmd5);
 702
 703         kfree(server->secmech.sdeschmacmd5);
 704
 705         kfree(server->secmech.sdescmd5);
 706 }
 707
 708 int
 709 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 710 {
 711         int rc;
 712         unsigned int size;
 713
 714         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 715         if (IS_ERR(server->secmech.hmacmd5)) {
 716                 cERROR(1, "could not allocate crypto hmacmd5\n");
 717                 return PTR_ERR(server->secmech.hmacmd5);
 718         }
 719
 720         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 721         if (IS_ERR(server->secmech.md5)) {
 722                 cERROR(1, "could not allocate crypto md5\n");
 723                 rc = PTR_ERR(server->secmech.md5);
 724                 goto crypto_allocate_md5_fail;
 725         }
 726
 727         size = sizeof(struct shash_desc) +
 728                         crypto_shash_descsize(server->secmech.hmacmd5);
 729         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 730         if (!server->secmech.sdeschmacmd5) {
 731                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
 732                 rc = -ENOMEM;
 733                 goto crypto_allocate_hmacmd5_sdesc_fail;
 734         }
 735         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 736         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 737
 738
 739         size = sizeof(struct shash_desc) +
 740                         crypto_shash_descsize(server->secmech.md5);
 741         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 742         if (!server->secmech.sdescmd5) {
 743                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
 744                 rc = -ENOMEM;
 745                 goto crypto_allocate_md5_sdesc_fail;
 746         }
 747         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 748         server->secmech.sdescmd5->shash.flags = 0x0;
 749
 750         return 0;
 751
 752 crypto_allocate_md5_sdesc_fail:
 753         kfree(server->secmech.sdeschmacmd5);
 754
 755 crypto_allocate_hmacmd5_sdesc_fail:
 756         crypto_free_shash(server->secmech.md5);
 757
 758 crypto_allocate_md5_fail:
 759         crypto_free_shash(server->secmech.hmacmd5);
 760
 761         return rc;
 762 }