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_calc_signature(const struct kvec *iov, int n_vec,
  41                         struct TCP_Server_Info *server, char *signature)
  42 {
  43         int i;
  44         int rc;
  45
  46         if (iov == NULL || signature == NULL || server == NULL)
  47                 return -EINVAL;
  48
  49         if (!server->secmech.sdescmd5) {
  50                 cERROR(1, "%s: Can't generate signature\n", __func__);
  51                 return -1;
  52         }
  53
  54         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  55         if (rc) {
  56                 cERROR(1, "%s: Could not init md5\n", __func__);
  57                 return rc;
  58         }
  59
  60         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  61                 server->session_key.response, server->session_key.len);
  62         if (rc) {
  63                 cERROR(1, "%s: Could not update with response\n", __func__);
  64                 return rc;
  65         }
  66
  67         for (i = 0; i < n_vec; i++) {
  68                 if (iov[i].iov_len == 0)
  69                         continue;
  70                 if (iov[i].iov_base == NULL) {
  71                         cERROR(1, "null iovec entry");
  72                         return -EIO;
  73                 }
  74                 /* The first entry includes a length field (which does not get
  75                    signed that occupies the first 4 bytes before the header */
  76                 if (i == 0) {
  77                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
  78                                 break; /* nothing to sign or corrupt header */
  79                         rc =
  80                         crypto_shash_update(&server->secmech.sdescmd5->shash,
  81                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
  82                 } else {
  83                         rc =
  84                         crypto_shash_update(&server->secmech.sdescmd5->shash,
  85                                 iov[i].iov_base, iov[i].iov_len);
  86                 }
  87                 if (rc) {
  88                         cERROR(1, "%s: Could not update with payload\n",
  89                                                         __func__);
  90                         return rc;
  91                 }
  92         }
  93
  94         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
  95         if (rc)
  96                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
  97
  98         return rc;
  99 }
 100
 101 /* must be called with server->srv_mutex held */
 102 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 103                    __u32 *pexpected_response_sequence_number)
 104 {
 105         int rc = 0;
 106         char smb_signature[20];
 107         struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
 108
 109         if ((cifs_pdu == NULL) || (server == NULL))
 110                 return -EINVAL;
 111
 112         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 113             server->tcpStatus == CifsNeedNegotiate)
 114                 return rc;
 115
 116         if (!server->session_estab) {
 117                 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 118                 return rc;
 119         }
 120
 121         cifs_pdu->Signature.Sequence.SequenceNumber =
 122                                 cpu_to_le32(server->sequence_number);
 123         cifs_pdu->Signature.Sequence.Reserved = 0;
 124
 125         *pexpected_response_sequence_number = server->sequence_number++;
 126         server->sequence_number++;
 127
 128         rc = cifs_calc_signature(iov, n_vec, server, smb_signature);
 129         if (rc)
 130                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 131         else
 132                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 133
 134         return rc;
 135 }
 136
 137 /* must be called with server->srv_mutex held */
 138 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 139                   __u32 *pexpected_response_sequence_number)
 140 {
 141         struct kvec iov;
 142
 143         iov.iov_base = cifs_pdu;
 144         iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
 145
 146         return cifs_sign_smb2(&iov, 1, server,
 147                               pexpected_response_sequence_number);
 148 }
 149
 150 int cifs_verify_signature(struct kvec *iov, unsigned int nr_iov,
 151                           struct TCP_Server_Info *server,
 152                           __u32 expected_sequence_number)
 153 {
 154         unsigned int rc;
 155         char server_response_sig[8];
 156         char what_we_think_sig_should_be[20];
 157         struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
 158
 159         if (cifs_pdu == NULL || server == NULL)
 160                 return -EINVAL;
 161
 162         if (!server->session_estab)
 163                 return 0;
 164
 165         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 166                 struct smb_com_lock_req *pSMB =
 167                         (struct smb_com_lock_req *)cifs_pdu;
 168             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 169                         return 0;
 170         }
 171
 172         /* BB what if signatures are supposed to be on for session but
 173            server does not send one? BB */
 174
 175         /* Do not need to verify session setups with signature "BSRSPYL "  */
 176         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 177                 cFYI(1, "dummy signature received for smb command 0x%x",
 178                         cifs_pdu->Command);
 179
 180         /* save off the origiginal signature so we can modify the smb and check
 181                 its signature against what the server sent */
 182         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 183
 184         cifs_pdu->Signature.Sequence.SequenceNumber =
 185                                         cpu_to_le32(expected_sequence_number);
 186         cifs_pdu->Signature.Sequence.Reserved = 0;
 187
 188         mutex_lock(&server->srv_mutex);
 189         rc = cifs_calc_signature(iov, nr_iov, server,
 190                                  what_we_think_sig_should_be);
 191         mutex_unlock(&server->srv_mutex);
 192
 193         if (rc)
 194                 return rc;
 195
 196 /*      cifs_dump_mem("what we think it should be: ",
 197                       what_we_think_sig_should_be, 16); */
 198
 199         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 200                 return -EACCES;
 201         else
 202                 return 0;
 203
 204 }
 205
 206 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 207 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
 208 {
 209         int rc = 0;
 210         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 211         char temp_key[CIFS_SESS_KEY_SIZE];
 212
 213         if (!ses)
 214                 return -EINVAL;
 215
 216         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 217         if (!ses->auth_key.response) {
 218                 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 219                 return -ENOMEM;
 220         }
 221         ses->auth_key.len = temp_len;
 222
 223         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 224                         ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
 225         if (rc) {
 226                 cFYI(1, "%s Can't generate NTLM response, error: %d",
 227                         __func__, rc);
 228                 return rc;
 229         }
 230
 231         rc = E_md4hash(ses->password, temp_key, nls_cp);
 232         if (rc) {
 233                 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
 234                 return rc;
 235         }
 236
 237         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 238         if (rc)
 239                 cFYI(1, "%s Can't generate NTLM session key, error: %d",
 240                         __func__, rc);
 241
 242         return rc;
 243 }
 244
 245 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 246 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 247                         char *lnm_session_key)
 248 {
 249         int i;
 250         int rc;
 251         char password_with_pad[CIFS_ENCPWD_SIZE];
 252
 253         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 254         if (password)
 255                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 256
 257         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 258                 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 259                 memcpy(lnm_session_key, password_with_pad,
 260                         CIFS_ENCPWD_SIZE);
 261                 return 0;
 262         }
 263
 264         /* calculate old style session key */
 265         /* calling toupper is less broken than repeatedly
 266         calling nls_toupper would be since that will never
 267         work for UTF8, but neither handles multibyte code pages
 268         but the only alternative would be converting to UCS-16 (Unicode)
 269         (using a routine something like UniStrupr) then
 270         uppercasing and then converting back from Unicode - which
 271         would only worth doing it if we knew it were utf8. Basically
 272         utf8 and other multibyte codepages each need their own strupper
 273         function since a byte at a time will ont work. */
 274
 275         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 276                 password_with_pad[i] = toupper(password_with_pad[i]);
 277
 278         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 279
 280         return rc;
 281 }
 282 #endif /* CIFS_WEAK_PW_HASH */
 283
 284 /* Build a proper attribute value/target info pairs blob.
 285  * Fill in netbios and dns domain name and workstation name
 286  * and client time (total five av pairs and + one end of fields indicator.
 287  * Allocate domain name which gets freed when session struct is deallocated.
 288  */
 289 static int
 290 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 291 {
 292         unsigned int dlen;
 293         unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 294         char *defdmname = "WORKGROUP";
 295         unsigned char *blobptr;
 296         struct ntlmssp2_name *attrptr;
 297
 298         if (!ses->domainName) {
 299                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 300                 if (!ses->domainName)
 301                         return -ENOMEM;
 302         }
 303
 304         dlen = strlen(ses->domainName);
 305
 306         /*
 307          * The length of this blob is two times the size of a
 308          * structure (av pair) which holds name/size
 309          * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 310          * unicode length of a netbios domain name
 311          */
 312         ses->auth_key.len = size + 2 * dlen;
 313         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 314         if (!ses->auth_key.response) {
 315                 ses->auth_key.len = 0;
 316                 cERROR(1, "Challenge target info allocation failure");
 317                 return -ENOMEM;
 318         }
 319
 320         blobptr = ses->auth_key.response;
 321         attrptr = (struct ntlmssp2_name *) blobptr;
 322
 323         /*
 324          * As defined in MS-NTLM 3.3.2, just this av pair field
 325          * is sufficient as part of the temp
 326          */
 327         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 328         attrptr->length = cpu_to_le16(2 * dlen);
 329         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 330         cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 331
 332         return 0;
 333 }
 334
 335 /* Server has provided av pairs/target info in the type 2 challenge
 336  * packet and we have plucked it and stored within smb session.
 337  * We parse that blob here to find netbios domain name to be used
 338  * as part of ntlmv2 authentication (in Target String), if not already
 339  * specified on the command line.
 340  * If this function returns without any error but without fetching
 341  * domain name, authentication may fail against some server but
 342  * may not fail against other (those who are not very particular
 343  * about target string i.e. for some, just user name might suffice.
 344  */
 345 static int
 346 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 347 {
 348         unsigned int attrsize;
 349         unsigned int type;
 350         unsigned int onesize = sizeof(struct ntlmssp2_name);
 351         unsigned char *blobptr;
 352         unsigned char *blobend;
 353         struct ntlmssp2_name *attrptr;
 354
 355         if (!ses->auth_key.len || !ses->auth_key.response)
 356                 return 0;
 357
 358         blobptr = ses->auth_key.response;
 359         blobend = blobptr + ses->auth_key.len;
 360
 361         while (blobptr + onesize < blobend) {
 362                 attrptr = (struct ntlmssp2_name *) blobptr;
 363                 type = le16_to_cpu(attrptr->type);
 364                 if (type == NTLMSSP_AV_EOL)
 365                         break;
 366                 blobptr += 2; /* advance attr type */
 367                 attrsize = le16_to_cpu(attrptr->length);
 368                 blobptr += 2; /* advance attr size */
 369                 if (blobptr + attrsize > blobend)
 370                         break;
 371                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 372                         if (!attrsize)
 373                                 break;
 374                         if (!ses->domainName) {
 375                                 ses->domainName =
 376                                         kmalloc(attrsize + 1, GFP_KERNEL);
 377                                 if (!ses->domainName)
 378                                                 return -ENOMEM;
 379                                 cifs_from_utf16(ses->domainName,
 380                                         (__le16 *)blobptr, attrsize, attrsize,
 381                                         nls_cp, false);
 382                                 break;
 383                         }
 384                 }
 385                 blobptr += attrsize; /* advance attr  value */
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 392                             const struct nls_table *nls_cp)
 393 {
 394         int rc = 0;
 395         int len;
 396         char nt_hash[CIFS_NTHASH_SIZE];
 397         wchar_t *user;
 398         wchar_t *domain;
 399         wchar_t *server;
 400
 401         if (!ses->server->secmech.sdeschmacmd5) {
 402                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 403                 return -1;
 404         }
 405
 406         /* calculate md4 hash of password */
 407         E_md4hash(ses->password, nt_hash, nls_cp);
 408
 409         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 410                                 CIFS_NTHASH_SIZE);
 411         if (rc) {
 412                 cERROR(1, "%s: Could not set NT Hash as a key", __func__);
 413                 return rc;
 414         }
 415
 416         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 417         if (rc) {
 418                 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
 419                 return rc;
 420         }
 421
 422         /* convert ses->user_name to unicode and uppercase */
 423         len = ses->user_name ? strlen(ses->user_name) : 0;
 424         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 425         if (user == NULL) {
 426                 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
 427                 rc = -ENOMEM;
 428                 return rc;
 429         }
 430
 431         if (len) {
 432                 len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp);
 433                 UniStrupr(user);
 434         } else {
 435                 memset(user, '\0', 2);
 436         }
 437
 438         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 439                                 (char *)user, 2 * len);
 440         kfree(user);
 441         if (rc) {
 442                 cERROR(1, "%s: Could not update with user\n", __func__);
 443                 return rc;
 444         }
 445
 446         /* convert ses->domainName to unicode and uppercase */
 447         if (ses->domainName) {
 448                 len = strlen(ses->domainName);
 449
 450                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 451                 if (domain == NULL) {
 452                         cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 453                         rc = -ENOMEM;
 454                         return rc;
 455                 }
 456                 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 457                                       nls_cp);
 458                 rc =
 459                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 460                                         (char *)domain, 2 * len);
 461                 kfree(domain);
 462                 if (rc) {
 463                         cERROR(1, "%s: Could not update with domain\n",
 464                                                                 __func__);
 465                         return rc;
 466                 }
 467         } else if (ses->serverName) {
 468                 len = strlen(ses->serverName);
 469
 470                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 471                 if (server == NULL) {
 472                         cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 473                         rc = -ENOMEM;
 474                         return rc;
 475                 }
 476                 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
 477                                         nls_cp);
 478                 rc =
 479                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 480                                         (char *)server, 2 * len);
 481                 kfree(server);
 482                 if (rc) {
 483                         cERROR(1, "%s: Could not update with server\n",
 484                                                                 __func__);
 485                         return rc;
 486                 }
 487         }
 488
 489         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 490                                         ntlmv2_hash);
 491         if (rc)
 492                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 493
 494         return rc;
 495 }
 496
 497 static int
 498 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 499 {
 500         int rc;
 501         unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 502
 503         if (!ses->server->secmech.sdeschmacmd5) {
 504                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 505                 return -1;
 506         }
 507
 508         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 509                                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 510         if (rc) {
 511                 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 512                 return rc;
 513         }
 514
 515         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 516         if (rc) {
 517                 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 518                 return rc;
 519         }
 520
 521         if (ses->server->secType == RawNTLMSSP)
 522                 memcpy(ses->auth_key.response + offset,
 523                         ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 524         else
 525                 memcpy(ses->auth_key.response + offset,
 526                         ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 527         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 528                 ses->auth_key.response + offset, ses->auth_key.len - offset);
 529         if (rc) {
 530                 cERROR(1, "%s: Could not update with response\n", __func__);
 531                 return rc;
 532         }
 533
 534         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 535                 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 536         if (rc)
 537                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 538
 539         return rc;
 540 }
 541
 542
 543 int
 544 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 545 {
 546         int rc;
 547         int baselen;
 548         unsigned int tilen;
 549         struct ntlmv2_resp *buf;
 550         char ntlmv2_hash[16];
 551         unsigned char *tiblob = NULL; /* target info blob */
 552
 553         if (ses->server->secType == RawNTLMSSP) {
 554                 if (!ses->domainName) {
 555                         rc = find_domain_name(ses, nls_cp);
 556                         if (rc) {
 557                                 cERROR(1, "error %d finding domain name", rc);
 558                                 goto setup_ntlmv2_rsp_ret;
 559                         }
 560                 }
 561         } else {
 562                 rc = build_avpair_blob(ses, nls_cp);
 563                 if (rc) {
 564                         cERROR(1, "error %d building av pair blob", rc);
 565                         goto setup_ntlmv2_rsp_ret;
 566                 }
 567         }
 568
 569         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 570         tilen = ses->auth_key.len;
 571         tiblob = ses->auth_key.response;
 572
 573         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 574         if (!ses->auth_key.response) {
 575                 rc = ENOMEM;
 576                 ses->auth_key.len = 0;
 577                 cERROR(1, "%s: Can't allocate auth blob", __func__);
 578                 goto setup_ntlmv2_rsp_ret;
 579         }
 580         ses->auth_key.len += baselen;
 581
 582         buf = (struct ntlmv2_resp *)
 583                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 584         buf->blob_signature = cpu_to_le32(0x00000101);
 585         buf->reserved = 0;
 586         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 587         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 588         buf->reserved2 = 0;
 589
 590         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 591
 592         /* calculate ntlmv2_hash */
 593         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 594         if (rc) {
 595                 cERROR(1, "could not get v2 hash rc %d", rc);
 596                 goto setup_ntlmv2_rsp_ret;
 597         }
 598
 599         /* calculate first part of the client response (CR1) */
 600         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 601         if (rc) {
 602                 cERROR(1, "Could not calculate CR1  rc: %d", rc);
 603                 goto setup_ntlmv2_rsp_ret;
 604         }
 605
 606         /* now calculate the session key for NTLMv2 */
 607         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 608                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 609         if (rc) {
 610                 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 611                 goto setup_ntlmv2_rsp_ret;
 612         }
 613
 614         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 615         if (rc) {
 616                 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
 617                 goto setup_ntlmv2_rsp_ret;
 618         }
 619
 620         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 621                 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 622                 CIFS_HMAC_MD5_HASH_SIZE);
 623         if (rc) {
 624                 cERROR(1, "%s: Could not update with response\n", __func__);
 625                 goto setup_ntlmv2_rsp_ret;
 626         }
 627
 628         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 629                 ses->auth_key.response);
 630         if (rc)
 631                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 632
 633 setup_ntlmv2_rsp_ret:
 634         kfree(tiblob);
 635
 636         return rc;
 637 }
 638
 639 int
 640 calc_seckey(struct cifs_ses *ses)
 641 {
 642         int rc;
 643         struct crypto_blkcipher *tfm_arc4;
 644         struct scatterlist sgin, sgout;
 645         struct blkcipher_desc desc;
 646         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 647
 648         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 649
 650         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 651         if (IS_ERR(tfm_arc4)) {
 652                 rc = PTR_ERR(tfm_arc4);
 653                 cERROR(1, "could not allocate crypto API arc4\n");
 654                 return rc;
 655         }
 656
 657         desc.tfm = tfm_arc4;
 658
 659         rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 660                                         CIFS_SESS_KEY_SIZE);
 661         if (rc) {
 662                 cERROR(1, "%s: Could not set response as a key", __func__);
 663                 return rc;
 664         }
 665
 666         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 667         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 668
 669         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 670         if (rc) {
 671                 cERROR(1, "could not encrypt session key rc: %d\n", rc);
 672                 crypto_free_blkcipher(tfm_arc4);
 673                 return rc;
 674         }
 675
 676         /* make secondary_key/nonce as session key */
 677         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 678         /* and make len as that of session key only */
 679         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 680
 681         crypto_free_blkcipher(tfm_arc4);
 682
 683         return rc;
 684 }
 685
 686 void
 687 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 688 {
 689         if (server->secmech.md5)
 690                 crypto_free_shash(server->secmech.md5);
 691
 692         if (server->secmech.hmacmd5)
 693                 crypto_free_shash(server->secmech.hmacmd5);
 694
 695         kfree(server->secmech.sdeschmacmd5);
 696
 697         kfree(server->secmech.sdescmd5);
 698 }
 699
 700 int
 701 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 702 {
 703         int rc;
 704         unsigned int size;
 705
 706         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 707         if (IS_ERR(server->secmech.hmacmd5)) {
 708                 cERROR(1, "could not allocate crypto hmacmd5\n");
 709                 return PTR_ERR(server->secmech.hmacmd5);
 710         }
 711
 712         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 713         if (IS_ERR(server->secmech.md5)) {
 714                 cERROR(1, "could not allocate crypto md5\n");
 715                 rc = PTR_ERR(server->secmech.md5);
 716                 goto crypto_allocate_md5_fail;
 717         }
 718
 719         size = sizeof(struct shash_desc) +
 720                         crypto_shash_descsize(server->secmech.hmacmd5);
 721         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 722         if (!server->secmech.sdeschmacmd5) {
 723                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
 724                 rc = -ENOMEM;
 725                 goto crypto_allocate_hmacmd5_sdesc_fail;
 726         }
 727         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 728         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 729
 730
 731         size = sizeof(struct shash_desc) +
 732                         crypto_shash_descsize(server->secmech.md5);
 733         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 734         if (!server->secmech.sdescmd5) {
 735                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
 736                 rc = -ENOMEM;
 737                 goto crypto_allocate_md5_sdesc_fail;
 738         }
 739         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 740         server->secmech.sdescmd5->shash.flags = 0x0;
 741
 742         return 0;
 743
 744 crypto_allocate_md5_sdesc_fail:
 745         kfree(server->secmech.sdeschmacmd5);
 746
 747 crypto_allocate_hmacmd5_sdesc_fail:
 748         crypto_free_shash(server->secmech.md5);
 749
 750 crypto_allocate_md5_fail:
 751         crypto_free_shash(server->secmech.hmacmd5);
 752
 753         return rc;
 754 }