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