fs/cifs/cifsencrypt.c

   1 /*
   2  *   fs/cifs/cifsencrypt.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2005,2013
   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 #include <linux/highmem.h>
  33
  34 static int
  35 cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
  36 {
  37         int rc;
  38         unsigned int size;
  39
  40         if (server->secmech.sdescmd5 != NULL)
  41                 return 0; /* already allocated */
  42
  43         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
  44         if (IS_ERR(server->secmech.md5)) {
  45                 cifs_dbg(VFS, "could not allocate crypto md5\n");
  46                 return PTR_ERR(server->secmech.md5);
  47         }
  48
  49         size = sizeof(struct shash_desc) +
  50                         crypto_shash_descsize(server->secmech.md5);
  51         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
  52         if (!server->secmech.sdescmd5) {
  53                 rc = -ENOMEM;
  54                 crypto_free_shash(server->secmech.md5);
  55                 server->secmech.md5 = NULL;
  56                 return rc;
  57         }
  58         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
  59         server->secmech.sdescmd5->shash.flags = 0x0;
  60
  61         return 0;
  62 }
  63
  64 /*
  65  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
  66  * The 16 byte signature must be allocated by the caller. Note we only use the
  67  * 1st eight bytes and that the smb header signature field on input contains
  68  * the sequence number before this function is called. Also, this function
  69  * should be called with the server->srv_mutex held.
  70  */
  71 static int cifs_calc_signature(struct smb_rqst *rqst,
  72                         struct TCP_Server_Info *server, char *signature)
  73 {
  74         int i;
  75         int rc;
  76         struct kvec *iov = rqst->rq_iov;
  77         int n_vec = rqst->rq_nvec;
  78
  79         if (iov == NULL || signature == NULL || server == NULL)
  80                 return -EINVAL;
  81
  82         if (!server->secmech.sdescmd5) {
  83                 rc = cifs_crypto_shash_md5_allocate(server);
  84                 if (rc) {
  85                         cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
  86                         return -1;
  87                 }
  88         }
  89
  90         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  91         if (rc) {
  92                 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
  93                 return rc;
  94         }
  95
  96         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  97                 server->session_key.response, server->session_key.len);
  98         if (rc) {
  99                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 100                 return rc;
 101         }
 102
 103         for (i = 0; i < n_vec; i++) {
 104                 if (iov[i].iov_len == 0)
 105                         continue;
 106                 if (iov[i].iov_base == NULL) {
 107                         cifs_dbg(VFS, "null iovec entry\n");
 108                         return -EIO;
 109                 }
 110                 /* The first entry includes a length field (which does not get
 111                    signed that occupies the first 4 bytes before the header */
 112                 if (i == 0) {
 113                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 114                                 break; /* nothing to sign or corrupt header */
 115                         rc =
 116                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 117                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 118                 } else {
 119                         rc =
 120                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 121                                 iov[i].iov_base, iov[i].iov_len);
 122                 }
 123                 if (rc) {
 124                         cifs_dbg(VFS, "%s: Could not update with payload\n",
 125                                  __func__);
 126                         return rc;
 127                 }
 128         }
 129
 130         /* now hash over the rq_pages array */
 131         for (i = 0; i < rqst->rq_npages; i++) {
 132                 struct kvec p_iov;
 133
 134                 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
 135                 crypto_shash_update(&server->secmech.sdescmd5->shash,
 136                                         p_iov.iov_base, p_iov.iov_len);
 137                 kunmap(rqst->rq_pages[i]);
 138         }
 139
 140         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 141         if (rc)
 142                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 143
 144         return rc;
 145 }
 146
 147 /* must be called with server->srv_mutex held */
 148 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
 149                    __u32 *pexpected_response_sequence_number)
 150 {
 151         int rc = 0;
 152         char smb_signature[20];
 153         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 154
 155         if ((cifs_pdu == NULL) || (server == NULL))
 156                 return -EINVAL;
 157
 158         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 159             server->tcpStatus == CifsNeedNegotiate)
 160                 return rc;
 161
 162         if (!server->session_estab) {
 163                 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 164                 return rc;
 165         }
 166
 167         cifs_pdu->Signature.Sequence.SequenceNumber =
 168                                 cpu_to_le32(server->sequence_number);
 169         cifs_pdu->Signature.Sequence.Reserved = 0;
 170
 171         *pexpected_response_sequence_number = ++server->sequence_number;
 172         ++server->sequence_number;
 173
 174         rc = cifs_calc_signature(rqst, server, smb_signature);
 175         if (rc)
 176                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 177         else
 178                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 179
 180         return rc;
 181 }
 182
 183 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 184                    __u32 *pexpected_response_sequence)
 185 {
 186         struct smb_rqst rqst = { .rq_iov = iov,
 187                                  .rq_nvec = n_vec };
 188
 189         return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
 190 }
 191
 192 /* must be called with server->srv_mutex held */
 193 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 194                   __u32 *pexpected_response_sequence_number)
 195 {
 196         struct kvec iov;
 197
 198         iov.iov_base = cifs_pdu;
 199         iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
 200
 201         return cifs_sign_smbv(&iov, 1, server,
 202                               pexpected_response_sequence_number);
 203 }
 204
 205 int cifs_verify_signature(struct smb_rqst *rqst,
 206                           struct TCP_Server_Info *server,
 207                           __u32 expected_sequence_number)
 208 {
 209         unsigned int rc;
 210         char server_response_sig[8];
 211         char what_we_think_sig_should_be[20];
 212         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 213
 214         if (cifs_pdu == NULL || server == NULL)
 215                 return -EINVAL;
 216
 217         if (!server->session_estab)
 218                 return 0;
 219
 220         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 221                 struct smb_com_lock_req *pSMB =
 222                         (struct smb_com_lock_req *)cifs_pdu;
 223             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 224                         return 0;
 225         }
 226
 227         /* BB what if signatures are supposed to be on for session but
 228            server does not send one? BB */
 229
 230         /* Do not need to verify session setups with signature "BSRSPYL "  */
 231         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 232                 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
 233                          cifs_pdu->Command);
 234
 235         /* save off the origiginal signature so we can modify the smb and check
 236                 its signature against what the server sent */
 237         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 238
 239         cifs_pdu->Signature.Sequence.SequenceNumber =
 240                                         cpu_to_le32(expected_sequence_number);
 241         cifs_pdu->Signature.Sequence.Reserved = 0;
 242
 243         mutex_lock(&server->srv_mutex);
 244         rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
 245         mutex_unlock(&server->srv_mutex);
 246
 247         if (rc)
 248                 return rc;
 249
 250 /*      cifs_dump_mem("what we think it should be: ",
 251                       what_we_think_sig_should_be, 16); */
 252
 253         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 254                 return -EACCES;
 255         else
 256                 return 0;
 257
 258 }
 259
 260 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 261 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
 262 {
 263         int rc = 0;
 264         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 265         char temp_key[CIFS_SESS_KEY_SIZE];
 266
 267         if (!ses)
 268                 return -EINVAL;
 269
 270         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 271         if (!ses->auth_key.response)
 272                 return -ENOMEM;
 273
 274         ses->auth_key.len = temp_len;
 275
 276         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 277                         ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
 278         if (rc) {
 279                 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
 280                          __func__, rc);
 281                 return rc;
 282         }
 283
 284         rc = E_md4hash(ses->password, temp_key, nls_cp);
 285         if (rc) {
 286                 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
 287                          __func__, rc);
 288                 return rc;
 289         }
 290
 291         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 292         if (rc)
 293                 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
 294                          __func__, rc);
 295
 296         return rc;
 297 }
 298
 299 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 300 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 301                         char *lnm_session_key)
 302 {
 303         int i;
 304         int rc;
 305         char password_with_pad[CIFS_ENCPWD_SIZE];
 306
 307         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 308         if (password)
 309                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 310
 311         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 312                 memcpy(lnm_session_key, password_with_pad,
 313                         CIFS_ENCPWD_SIZE);
 314                 return 0;
 315         }
 316
 317         /* calculate old style session key */
 318         /* calling toupper is less broken than repeatedly
 319         calling nls_toupper would be since that will never
 320         work for UTF8, but neither handles multibyte code pages
 321         but the only alternative would be converting to UCS-16 (Unicode)
 322         (using a routine something like UniStrupr) then
 323         uppercasing and then converting back from Unicode - which
 324         would only worth doing it if we knew it were utf8. Basically
 325         utf8 and other multibyte codepages each need their own strupper
 326         function since a byte at a time will ont work. */
 327
 328         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 329                 password_with_pad[i] = toupper(password_with_pad[i]);
 330
 331         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 332
 333         return rc;
 334 }
 335 #endif /* CIFS_WEAK_PW_HASH */
 336
 337 /* Build a proper attribute value/target info pairs blob.
 338  * Fill in netbios and dns domain name and workstation name
 339  * and client time (total five av pairs and + one end of fields indicator.
 340  * Allocate domain name which gets freed when session struct is deallocated.
 341  */
 342 static int
 343 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 344 {
 345         unsigned int dlen;
 346         unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 347         char *defdmname = "WORKGROUP";
 348         unsigned char *blobptr;
 349         struct ntlmssp2_name *attrptr;
 350
 351         if (!ses->domainName) {
 352                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 353                 if (!ses->domainName)
 354                         return -ENOMEM;
 355         }
 356
 357         dlen = strlen(ses->domainName);
 358
 359         /*
 360          * The length of this blob is two times the size of a
 361          * structure (av pair) which holds name/size
 362          * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 363          * unicode length of a netbios domain name
 364          */
 365         ses->auth_key.len = size + 2 * dlen;
 366         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 367         if (!ses->auth_key.response) {
 368                 ses->auth_key.len = 0;
 369                 return -ENOMEM;
 370         }
 371
 372         blobptr = ses->auth_key.response;
 373         attrptr = (struct ntlmssp2_name *) blobptr;
 374
 375         /*
 376          * As defined in MS-NTLM 3.3.2, just this av pair field
 377          * is sufficient as part of the temp
 378          */
 379         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 380         attrptr->length = cpu_to_le16(2 * dlen);
 381         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 382         cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 383
 384         return 0;
 385 }
 386
 387 /* Server has provided av pairs/target info in the type 2 challenge
 388  * packet and we have plucked it and stored within smb session.
 389  * We parse that blob here to find netbios domain name to be used
 390  * as part of ntlmv2 authentication (in Target String), if not already
 391  * specified on the command line.
 392  * If this function returns without any error but without fetching
 393  * domain name, authentication may fail against some server but
 394  * may not fail against other (those who are not very particular
 395  * about target string i.e. for some, just user name might suffice.
 396  */
 397 static int
 398 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 399 {
 400         unsigned int attrsize;
 401         unsigned int type;
 402         unsigned int onesize = sizeof(struct ntlmssp2_name);
 403         unsigned char *blobptr;
 404         unsigned char *blobend;
 405         struct ntlmssp2_name *attrptr;
 406
 407         if (!ses->auth_key.len || !ses->auth_key.response)
 408                 return 0;
 409
 410         blobptr = ses->auth_key.response;
 411         blobend = blobptr + ses->auth_key.len;
 412
 413         while (blobptr + onesize < blobend) {
 414                 attrptr = (struct ntlmssp2_name *) blobptr;
 415                 type = le16_to_cpu(attrptr->type);
 416                 if (type == NTLMSSP_AV_EOL)
 417                         break;
 418                 blobptr += 2; /* advance attr type */
 419                 attrsize = le16_to_cpu(attrptr->length);
 420                 blobptr += 2; /* advance attr size */
 421                 if (blobptr + attrsize > blobend)
 422                         break;
 423                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 424                         if (!attrsize)
 425                                 break;
 426                         if (!ses->domainName) {
 427                                 ses->domainName =
 428                                         kmalloc(attrsize + 1, GFP_KERNEL);
 429                                 if (!ses->domainName)
 430                                                 return -ENOMEM;
 431                                 cifs_from_utf16(ses->domainName,
 432                                         (__le16 *)blobptr, attrsize, attrsize,
 433                                         nls_cp, false);
 434                                 break;
 435                         }
 436                 }
 437                 blobptr += attrsize; /* advance attr  value */
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 444                             const struct nls_table *nls_cp)
 445 {
 446         int rc = 0;
 447         int len;
 448         char nt_hash[CIFS_NTHASH_SIZE];
 449         __le16 *user;
 450         wchar_t *domain;
 451         wchar_t *server;
 452
 453         if (!ses->server->secmech.sdeschmacmd5) {
 454                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 455                 return -1;
 456         }
 457
 458         /* calculate md4 hash of password */
 459         E_md4hash(ses->password, nt_hash, nls_cp);
 460
 461         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 462                                 CIFS_NTHASH_SIZE);
 463         if (rc) {
 464                 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
 465                 return rc;
 466         }
 467
 468         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 469         if (rc) {
 470                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 471                 return rc;
 472         }
 473
 474         /* convert ses->user_name to unicode */
 475         len = ses->user_name ? strlen(ses->user_name) : 0;
 476         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 477         if (user == NULL) {
 478                 rc = -ENOMEM;
 479                 return rc;
 480         }
 481
 482         if (len) {
 483                 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
 484                 UniStrupr(user);
 485         } else {
 486                 memset(user, '\0', 2);
 487         }
 488
 489         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 490                                 (char *)user, 2 * len);
 491         kfree(user);
 492         if (rc) {
 493                 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
 494                 return rc;
 495         }
 496
 497         /* convert ses->domainName to unicode and uppercase */
 498         if (ses->domainName) {
 499                 len = strlen(ses->domainName);
 500
 501                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 502                 if (domain == NULL) {
 503                         rc = -ENOMEM;
 504                         return rc;
 505                 }
 506                 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 507                                       nls_cp);
 508                 rc =
 509                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 510                                         (char *)domain, 2 * len);
 511                 kfree(domain);
 512                 if (rc) {
 513                         cifs_dbg(VFS, "%s: Could not update with domain\n",
 514                                  __func__);
 515                         return rc;
 516                 }
 517         } else if (ses->serverName) {
 518                 len = strlen(ses->serverName);
 519
 520                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 521                 if (server == NULL) {
 522                         rc = -ENOMEM;
 523                         return rc;
 524                 }
 525                 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
 526                                         nls_cp);
 527                 rc =
 528                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 529                                         (char *)server, 2 * len);
 530                 kfree(server);
 531                 if (rc) {
 532                         cifs_dbg(VFS, "%s: Could not update with server\n",
 533                                  __func__);
 534                         return rc;
 535                 }
 536         }
 537
 538         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 539                                         ntlmv2_hash);
 540         if (rc)
 541                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 542
 543         return rc;
 544 }
 545
 546 static int
 547 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 548 {
 549         int rc;
 550         unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 551
 552         if (!ses->server->secmech.sdeschmacmd5) {
 553                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 554                 return -1;
 555         }
 556
 557         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 558                                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 559         if (rc) {
 560                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 561                          __func__);
 562                 return rc;
 563         }
 564
 565         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 566         if (rc) {
 567                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 568                 return rc;
 569         }
 570
 571         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
 572                 memcpy(ses->auth_key.response + offset,
 573                         ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 574         else
 575                 memcpy(ses->auth_key.response + offset,
 576                         ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 577         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 578                 ses->auth_key.response + offset, ses->auth_key.len - offset);
 579         if (rc) {
 580                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 581                 return rc;
 582         }
 583
 584         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 585                 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 586         if (rc)
 587                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 588
 589         return rc;
 590 }
 591
 592 static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
 593 {
 594         unsigned int size;
 595
 596         /* check if already allocated */
 597         if (server->secmech.sdeschmacmd5)
 598                 return 0;
 599
 600         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 601         if (IS_ERR(server->secmech.hmacmd5)) {
 602                 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
 603                 return PTR_ERR(server->secmech.hmacmd5);
 604         }
 605
 606         size = sizeof(struct shash_desc) +
 607                         crypto_shash_descsize(server->secmech.hmacmd5);
 608         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 609         if (!server->secmech.sdeschmacmd5) {
 610                 crypto_free_shash(server->secmech.hmacmd5);
 611                 server->secmech.hmacmd5 = NULL;
 612                 return -ENOMEM;
 613         }
 614         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 615         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 616
 617         return 0;
 618 }
 619
 620 int
 621 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 622 {
 623         int rc;
 624         int baselen;
 625         unsigned int tilen;
 626         struct ntlmv2_resp *buf;
 627         char ntlmv2_hash[16];
 628         unsigned char *tiblob = NULL; /* target info blob */
 629
 630         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
 631                 if (!ses->domainName) {
 632                         rc = find_domain_name(ses, nls_cp);
 633                         if (rc) {
 634                                 cifs_dbg(VFS, "error %d finding domain name\n",
 635                                          rc);
 636                                 goto setup_ntlmv2_rsp_ret;
 637                         }
 638                 }
 639         } else {
 640                 rc = build_avpair_blob(ses, nls_cp);
 641                 if (rc) {
 642                         cifs_dbg(VFS, "error %d building av pair blob\n", rc);
 643                         goto setup_ntlmv2_rsp_ret;
 644                 }
 645         }
 646
 647         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 648         tilen = ses->auth_key.len;
 649         tiblob = ses->auth_key.response;
 650
 651         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 652         if (!ses->auth_key.response) {
 653                 rc = ENOMEM;
 654                 ses->auth_key.len = 0;
 655                 goto setup_ntlmv2_rsp_ret;
 656         }
 657         ses->auth_key.len += baselen;
 658
 659         buf = (struct ntlmv2_resp *)
 660                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 661         buf->blob_signature = cpu_to_le32(0x00000101);
 662         buf->reserved = 0;
 663         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 664         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 665         buf->reserved2 = 0;
 666
 667         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 668
 669         rc = crypto_hmacmd5_alloc(ses->server);
 670         if (rc) {
 671                 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
 672                 goto setup_ntlmv2_rsp_ret;
 673         }
 674
 675         /* calculate ntlmv2_hash */
 676         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 677         if (rc) {
 678                 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
 679                 goto setup_ntlmv2_rsp_ret;
 680         }
 681
 682         /* calculate first part of the client response (CR1) */
 683         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 684         if (rc) {
 685                 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
 686                 goto setup_ntlmv2_rsp_ret;
 687         }
 688
 689         /* now calculate the session key for NTLMv2 */
 690         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 691                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 692         if (rc) {
 693                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 694                          __func__);
 695                 goto setup_ntlmv2_rsp_ret;
 696         }
 697
 698         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 699         if (rc) {
 700                 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
 701                 goto setup_ntlmv2_rsp_ret;
 702         }
 703
 704         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 705                 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 706                 CIFS_HMAC_MD5_HASH_SIZE);
 707         if (rc) {
 708                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 709                 goto setup_ntlmv2_rsp_ret;
 710         }
 711
 712         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 713                 ses->auth_key.response);
 714         if (rc)
 715                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 716
 717 setup_ntlmv2_rsp_ret:
 718         kfree(tiblob);
 719
 720         return rc;
 721 }
 722
 723 int
 724 calc_seckey(struct cifs_ses *ses)
 725 {
 726         int rc;
 727         struct crypto_blkcipher *tfm_arc4;
 728         struct scatterlist sgin, sgout;
 729         struct blkcipher_desc desc;
 730         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 731
 732         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 733
 734         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 735         if (IS_ERR(tfm_arc4)) {
 736                 rc = PTR_ERR(tfm_arc4);
 737                 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
 738                 return rc;
 739         }
 740
 741         desc.tfm = tfm_arc4;
 742
 743         rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 744                                         CIFS_SESS_KEY_SIZE);
 745         if (rc) {
 746                 cifs_dbg(VFS, "%s: Could not set response as a key\n",
 747                          __func__);
 748                 return rc;
 749         }
 750
 751         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 752         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 753
 754         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 755         if (rc) {
 756                 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
 757                 crypto_free_blkcipher(tfm_arc4);
 758                 return rc;
 759         }
 760
 761         /* make secondary_key/nonce as session key */
 762         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 763         /* and make len as that of session key only */
 764         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 765
 766         crypto_free_blkcipher(tfm_arc4);
 767
 768         return rc;
 769 }
 770
 771 void
 772 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 773 {
 774         if (server->secmech.cmacaes) {
 775                 crypto_free_shash(server->secmech.cmacaes);
 776                 server->secmech.cmacaes = NULL;
 777         }
 778
 779         if (server->secmech.hmacsha256) {
 780                 crypto_free_shash(server->secmech.hmacsha256);
 781                 server->secmech.hmacsha256 = NULL;
 782         }
 783
 784         if (server->secmech.md5) {
 785                 crypto_free_shash(server->secmech.md5);
 786                 server->secmech.md5 = NULL;
 787         }
 788
 789         if (server->secmech.hmacmd5) {
 790                 crypto_free_shash(server->secmech.hmacmd5);
 791                 server->secmech.hmacmd5 = NULL;
 792         }
 793
 794         kfree(server->secmech.sdesccmacaes);
 795         server->secmech.sdesccmacaes = NULL;
 796         kfree(server->secmech.sdeschmacsha256);
 797         server->secmech.sdeschmacsha256 = NULL;
 798         kfree(server->secmech.sdeschmacmd5);
 799         server->secmech.sdeschmacmd5 = NULL;
 800         kfree(server->secmech.sdescmd5);
 801         server->secmech.sdescmd5 = NULL;
 802 }