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: Could not init md5\n", __func__);
  56                 return rc;
  57         }
  58
  59         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  60                 server->session_key.response, server->session_key.len);
  61         if (rc) {
  62                 cERROR(1, "%s: Could not update with response\n", __func__);
  63                 return rc;
  64         }
  65
  66         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  67                 cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
  68         if (rc) {
  69                 cERROR(1, "%s: Could not update with payload\n", __func__);
  70                 return rc;
  71         }
  72
  73         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
  74         if (rc)
  75                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
  76
  77         return rc;
  78 }
  79
  80 /* must be called with server->srv_mutex held */
  81 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
  82                   __u32 *pexpected_response_sequence_number)
  83 {
  84         int rc = 0;
  85         char smb_signature[20];
  86
  87         if ((cifs_pdu == NULL) || (server == NULL))
  88                 return -EINVAL;
  89
  90         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
  91             server->tcpStatus == CifsNeedNegotiate)
  92                 return rc;
  93
  94         if (!server->session_estab) {
  95                 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
  96                 return rc;
  97         }
  98
  99         cifs_pdu->Signature.Sequence.SequenceNumber =
 100                         cpu_to_le32(server->sequence_number);
 101         cifs_pdu->Signature.Sequence.Reserved = 0;
 102
 103         *pexpected_response_sequence_number = server->sequence_number++;
 104         server->sequence_number++;
 105
 106         rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
 107         if (rc)
 108                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 109         else
 110                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 111
 112         return rc;
 113 }
 114
 115 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 116                                 struct TCP_Server_Info *server, char *signature)
 117 {
 118         int i;
 119         int rc;
 120
 121         if (iov == NULL || signature == NULL || server == NULL)
 122                 return -EINVAL;
 123
 124         if (!server->secmech.sdescmd5) {
 125                 cERROR(1, "%s: Can't generate signature\n", __func__);
 126                 return -1;
 127         }
 128
 129         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 130         if (rc) {
 131                 cERROR(1, "%s: Could not init md5\n", __func__);
 132                 return rc;
 133         }
 134
 135         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
 136                 server->session_key.response, server->session_key.len);
 137         if (rc) {
 138                 cERROR(1, "%s: Could not update with response\n", __func__);
 139                 return rc;
 140         }
 141
 142         for (i = 0; i < n_vec; i++) {
 143                 if (iov[i].iov_len == 0)
 144                         continue;
 145                 if (iov[i].iov_base == NULL) {
 146                         cERROR(1, "null iovec entry");
 147                         return -EIO;
 148                 }
 149                 /* The first entry includes a length field (which does not get
 150                    signed that occupies the first 4 bytes before the header */
 151                 if (i == 0) {
 152                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 153                                 break; /* nothing to sign or corrupt header */
 154                         rc =
 155                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 156                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 157                 } else {
 158                         rc =
 159                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 160                                 iov[i].iov_base, iov[i].iov_len);
 161                 }
 162                 if (rc) {
 163                         cERROR(1, "%s: Could not update with payload\n",
 164                                                         __func__);
 165                         return rc;
 166                 }
 167         }
 168
 169         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 170         if (rc)
 171                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 172
 173         return rc;
 174 }
 175
 176 /* must be called with server->srv_mutex held */
 177 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 178                    __u32 *pexpected_response_sequence_number)
 179 {
 180         int rc = 0;
 181         char smb_signature[20];
 182         struct smb_hdr *cifs_pdu = iov[0].iov_base;
 183
 184         if ((cifs_pdu == NULL) || (server == NULL))
 185                 return -EINVAL;
 186
 187         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 188             server->tcpStatus == CifsNeedNegotiate)
 189                 return rc;
 190
 191         if (!server->session_estab) {
 192                 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 193                 return rc;
 194         }
 195
 196         cifs_pdu->Signature.Sequence.SequenceNumber =
 197                                 cpu_to_le32(server->sequence_number);
 198         cifs_pdu->Signature.Sequence.Reserved = 0;
 199
 200         *pexpected_response_sequence_number = server->sequence_number++;
 201         server->sequence_number++;
 202
 203         rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
 204         if (rc)
 205                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 206         else
 207                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 208
 209         return rc;
 210 }
 211
 212 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 213                           struct TCP_Server_Info *server,
 214                           __u32 expected_sequence_number)
 215 {
 216         unsigned int rc;
 217         char server_response_sig[8];
 218         char what_we_think_sig_should_be[20];
 219
 220         if (cifs_pdu == NULL || server == NULL)
 221                 return -EINVAL;
 222
 223         if (!server->session_estab)
 224                 return 0;
 225
 226         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 227                 struct smb_com_lock_req *pSMB =
 228                         (struct smb_com_lock_req *)cifs_pdu;
 229             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 230                         return 0;
 231         }
 232
 233         /* BB what if signatures are supposed to be on for session but
 234            server does not send one? BB */
 235
 236         /* Do not need to verify session setups with signature "BSRSPYL "  */
 237         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 238                 cFYI(1, "dummy signature received for smb command 0x%x",
 239                         cifs_pdu->Command);
 240
 241         /* save off the origiginal signature so we can modify the smb and check
 242                 its signature against what the server sent */
 243         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 244
 245         cifs_pdu->Signature.Sequence.SequenceNumber =
 246                                         cpu_to_le32(expected_sequence_number);
 247         cifs_pdu->Signature.Sequence.Reserved = 0;
 248
 249         mutex_lock(&server->srv_mutex);
 250         rc = cifs_calculate_signature(cifs_pdu, server,
 251                 what_we_think_sig_should_be);
 252         mutex_unlock(&server->srv_mutex);
 253
 254         if (rc)
 255                 return rc;
 256
 257 /*      cifs_dump_mem("what we think it should be: ",
 258                       what_we_think_sig_should_be, 16); */
 259
 260         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 261                 return -EACCES;
 262         else
 263                 return 0;
 264
 265 }
 266
 267 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 268 int setup_ntlm_response(struct cifs_ses *ses)
 269 {
 270         int rc = 0;
 271         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 272         char temp_key[CIFS_SESS_KEY_SIZE];
 273
 274         if (!ses)
 275                 return -EINVAL;
 276
 277         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 278         if (!ses->auth_key.response) {
 279                 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 280                 return -ENOMEM;
 281         }
 282         ses->auth_key.len = temp_len;
 283
 284         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 285                         ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 286         if (rc) {
 287                 cFYI(1, "%s Can't generate NTLM response, error: %d",
 288                         __func__, rc);
 289                 return rc;
 290         }
 291
 292         rc = E_md4hash(ses->password, temp_key);
 293         if (rc) {
 294                 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
 295                 return rc;
 296         }
 297
 298         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 299         if (rc)
 300                 cFYI(1, "%s Can't generate NTLM session key, error: %d",
 301                         __func__, rc);
 302
 303         return rc;
 304 }
 305
 306 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 307 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 308                         char *lnm_session_key)
 309 {
 310         int i;
 311         int rc;
 312         char password_with_pad[CIFS_ENCPWD_SIZE];
 313
 314         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 315         if (password)
 316                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 317
 318         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 319                 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 320                 memcpy(lnm_session_key, password_with_pad,
 321                         CIFS_ENCPWD_SIZE);
 322                 return 0;
 323         }
 324
 325         /* calculate old style session key */
 326         /* calling toupper is less broken than repeatedly
 327         calling nls_toupper would be since that will never
 328         work for UTF8, but neither handles multibyte code pages
 329         but the only alternative would be converting to UCS-16 (Unicode)
 330         (using a routine something like UniStrupr) then
 331         uppercasing and then converting back from Unicode - which
 332         would only worth doing it if we knew it were utf8. Basically
 333         utf8 and other multibyte codepages each need their own strupper
 334         function since a byte at a time will ont work. */
 335
 336         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 337                 password_with_pad[i] = toupper(password_with_pad[i]);
 338
 339         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 340
 341         return rc;
 342 }
 343 #endif /* CIFS_WEAK_PW_HASH */
 344
 345 /* Build a proper attribute value/target info pairs blob.
 346  * Fill in netbios and dns domain name and workstation name
 347  * and client time (total five av pairs and + one end of fields indicator.
 348  * Allocate domain name which gets freed when session struct is deallocated.
 349  */
 350 static int
 351 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 352 {
 353         unsigned int dlen;
 354         unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 355         char *defdmname = "WORKGROUP";
 356         unsigned char *blobptr;
 357         struct ntlmssp2_name *attrptr;
 358
 359         if (!ses->domainName) {
 360                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 361                 if (!ses->domainName)
 362                         return -ENOMEM;
 363         }
 364
 365         dlen = strlen(ses->domainName);
 366
 367         /*
 368          * The length of this blob is two times the size of a
 369          * structure (av pair) which holds name/size
 370          * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 371          * unicode length of a netbios domain name
 372          */
 373         ses->auth_key.len = size + 2 * dlen;
 374         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 375         if (!ses->auth_key.response) {
 376                 ses->auth_key.len = 0;
 377                 cERROR(1, "Challenge target info allocation failure");
 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_strtoUCS((__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  */
 406 static int
 407 find_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)
 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_ucs2(ses->domainName,
 441                                         (__le16 *)blobptr, attrsize, attrsize,
 442                                         nls_cp, false);
 443                                 break;
 444                         }
 445                 }
 446                 blobptr += attrsize; /* advance attr  value */
 447         }
 448
 449         return 0;
 450 }
 451
 452 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 453                             const struct nls_table *nls_cp)
 454 {
 455         int rc = 0;
 456         int len;
 457         char nt_hash[CIFS_NTHASH_SIZE];
 458         wchar_t *user;
 459         wchar_t *domain;
 460         wchar_t *server;
 461
 462         if (!ses->server->secmech.sdeschmacmd5) {
 463                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 464                 return -1;
 465         }
 466
 467         /* calculate md4 hash of password */
 468         E_md4hash(ses->password, nt_hash);
 469
 470         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 471                                 CIFS_NTHASH_SIZE);
 472         if (rc) {
 473                 cERROR(1, "%s: Could not set NT Hash as a key", __func__);
 474                 return rc;
 475         }
 476
 477         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 478         if (rc) {
 479                 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
 480                 return rc;
 481         }
 482
 483         /* convert ses->user_name to unicode and uppercase */
 484         len = strlen(ses->user_name);
 485         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 486         if (user == NULL) {
 487                 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
 488                 rc = -ENOMEM;
 489                 return rc;
 490         }
 491         len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
 492         UniStrupr(user);
 493
 494         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 495                                 (char *)user, 2 * len);
 496         kfree(user);
 497         if (rc) {
 498                 cERROR(1, "%s: Could not update with user\n", __func__);
 499                 return rc;
 500         }
 501
 502         /* convert ses->domainName to unicode and uppercase */
 503         if (ses->domainName) {
 504                 len = strlen(ses->domainName);
 505
 506                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 507                 if (domain == NULL) {
 508                         cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 509                         rc = -ENOMEM;
 510                         return rc;
 511                 }
 512                 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
 513                                         nls_cp);
 514                 rc =
 515                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 516                                         (char *)domain, 2 * len);
 517                 kfree(domain);
 518                 if (rc) {
 519                         cERROR(1, "%s: Could not update with domain\n",
 520                                                                 __func__);
 521                         return rc;
 522                 }
 523         } else if (ses->serverName) {
 524                 len = strlen(ses->serverName);
 525
 526                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 527                 if (server == NULL) {
 528                         cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 529                         rc = -ENOMEM;
 530                         return rc;
 531                 }
 532                 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
 533                                         nls_cp);
 534                 rc =
 535                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 536                                         (char *)server, 2 * len);
 537                 kfree(server);
 538                 if (rc) {
 539                         cERROR(1, "%s: Could not update with server\n",
 540                                                                 __func__);
 541                         return rc;
 542                 }
 543         }
 544
 545         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 546                                         ntlmv2_hash);
 547         if (rc)
 548                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 549
 550         return rc;
 551 }
 552
 553 static int
 554 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 555 {
 556         int rc;
 557         unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 558
 559         if (!ses->server->secmech.sdeschmacmd5) {
 560                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 561                 return -1;
 562         }
 563
 564         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 565                                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 566         if (rc) {
 567                 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 568                 return rc;
 569         }
 570
 571         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 572         if (rc) {
 573                 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 574                 return rc;
 575         }
 576
 577         if (ses->server->secType == RawNTLMSSP)
 578                 memcpy(ses->auth_key.response + offset,
 579                         ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 580         else
 581                 memcpy(ses->auth_key.response + offset,
 582                         ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 583         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 584                 ses->auth_key.response + offset, ses->auth_key.len - offset);
 585         if (rc) {
 586                 cERROR(1, "%s: Could not update with response\n", __func__);
 587                 return rc;
 588         }
 589
 590         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 591                 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 592         if (rc)
 593                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 594
 595         return rc;
 596 }
 597
 598
 599 int
 600 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 601 {
 602         int rc;
 603         int baselen;
 604         unsigned int tilen;
 605         struct ntlmv2_resp *buf;
 606         char ntlmv2_hash[16];
 607         unsigned char *tiblob = NULL; /* target info blob */
 608
 609         if (ses->server->secType == RawNTLMSSP) {
 610                 if (!ses->domainName) {
 611                         rc = find_domain_name(ses, nls_cp);
 612                         if (rc) {
 613                                 cERROR(1, "error %d finding domain name", rc);
 614                                 goto setup_ntlmv2_rsp_ret;
 615                         }
 616                 }
 617         } else {
 618                 rc = build_avpair_blob(ses, nls_cp);
 619                 if (rc) {
 620                         cERROR(1, "error %d building av pair blob", rc);
 621                         goto setup_ntlmv2_rsp_ret;
 622                 }
 623         }
 624
 625         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 626         tilen = ses->auth_key.len;
 627         tiblob = ses->auth_key.response;
 628
 629         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 630         if (!ses->auth_key.response) {
 631                 rc = ENOMEM;
 632                 ses->auth_key.len = 0;
 633                 cERROR(1, "%s: Can't allocate auth blob", __func__);
 634                 goto setup_ntlmv2_rsp_ret;
 635         }
 636         ses->auth_key.len += baselen;
 637
 638         buf = (struct ntlmv2_resp *)
 639                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 640         buf->blob_signature = cpu_to_le32(0x00000101);
 641         buf->reserved = 0;
 642         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 643         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 644         buf->reserved2 = 0;
 645
 646         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 647
 648         /* calculate ntlmv2_hash */
 649         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 650         if (rc) {
 651                 cERROR(1, "could not get v2 hash rc %d", rc);
 652                 goto setup_ntlmv2_rsp_ret;
 653         }
 654
 655         /* calculate first part of the client response (CR1) */
 656         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 657         if (rc) {
 658                 cERROR(1, "Could not calculate CR1  rc: %d", rc);
 659                 goto setup_ntlmv2_rsp_ret;
 660         }
 661
 662         /* now calculate the session key for NTLMv2 */
 663         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 664                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 665         if (rc) {
 666                 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 667                 goto setup_ntlmv2_rsp_ret;
 668         }
 669
 670         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 671         if (rc) {
 672                 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
 673                 goto setup_ntlmv2_rsp_ret;
 674         }
 675
 676         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 677                 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 678                 CIFS_HMAC_MD5_HASH_SIZE);
 679         if (rc) {
 680                 cERROR(1, "%s: Could not update with response\n", __func__);
 681                 goto setup_ntlmv2_rsp_ret;
 682         }
 683
 684         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 685                 ses->auth_key.response);
 686         if (rc)
 687                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 688
 689 setup_ntlmv2_rsp_ret:
 690         kfree(tiblob);
 691
 692         return rc;
 693 }
 694
 695 int
 696 calc_seckey(struct cifs_ses *ses)
 697 {
 698         int rc;
 699         struct crypto_blkcipher *tfm_arc4;
 700         struct scatterlist sgin, sgout;
 701         struct blkcipher_desc desc;
 702         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 703
 704         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 705
 706         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 707         if (IS_ERR(tfm_arc4)) {
 708                 rc = PTR_ERR(tfm_arc4);
 709                 cERROR(1, "could not allocate crypto API arc4\n");
 710                 return rc;
 711         }
 712
 713         desc.tfm = tfm_arc4;
 714
 715         rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 716                                         CIFS_SESS_KEY_SIZE);
 717         if (rc) {
 718                 cERROR(1, "%s: Could not set response as a key", __func__);
 719                 return rc;
 720         }
 721
 722         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 723         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 724
 725         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 726         if (rc) {
 727                 cERROR(1, "could not encrypt session key rc: %d\n", rc);
 728                 crypto_free_blkcipher(tfm_arc4);
 729                 return rc;
 730         }
 731
 732         /* make secondary_key/nonce as session key */
 733         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 734         /* and make len as that of session key only */
 735         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 736
 737         crypto_free_blkcipher(tfm_arc4);
 738
 739         return rc;
 740 }
 741
 742 void
 743 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 744 {
 745         if (server->secmech.md5)
 746                 crypto_free_shash(server->secmech.md5);
 747
 748         if (server->secmech.hmacmd5)
 749                 crypto_free_shash(server->secmech.hmacmd5);
 750
 751         kfree(server->secmech.sdeschmacmd5);
 752
 753         kfree(server->secmech.sdescmd5);
 754 }
 755
 756 int
 757 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 758 {
 759         int rc;
 760         unsigned int size;
 761
 762         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 763         if (IS_ERR(server->secmech.hmacmd5)) {
 764                 cERROR(1, "could not allocate crypto hmacmd5\n");
 765                 return PTR_ERR(server->secmech.hmacmd5);
 766         }
 767
 768         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 769         if (IS_ERR(server->secmech.md5)) {
 770                 cERROR(1, "could not allocate crypto md5\n");
 771                 rc = PTR_ERR(server->secmech.md5);
 772                 goto crypto_allocate_md5_fail;
 773         }
 774
 775         size = sizeof(struct shash_desc) +
 776                         crypto_shash_descsize(server->secmech.hmacmd5);
 777         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 778         if (!server->secmech.sdeschmacmd5) {
 779                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
 780                 rc = -ENOMEM;
 781                 goto crypto_allocate_hmacmd5_sdesc_fail;
 782         }
 783         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 784         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 785
 786
 787         size = sizeof(struct shash_desc) +
 788                         crypto_shash_descsize(server->secmech.md5);
 789         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 790         if (!server->secmech.sdescmd5) {
 791                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
 792                 rc = -ENOMEM;
 793                 goto crypto_allocate_md5_sdesc_fail;
 794         }
 795         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 796         server->secmech.sdescmd5->shash.flags = 0x0;
 797
 798         return 0;
 799
 800 crypto_allocate_md5_sdesc_fail:
 801         kfree(server->secmech.sdeschmacmd5);
 802
 803 crypto_allocate_hmacmd5_sdesc_fail:
 804         crypto_free_shash(server->secmech.md5);
 805
 806 crypto_allocate_md5_fail:
 807         crypto_free_shash(server->secmech.hmacmd5);
 808
 809         return rc;
 810 }