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 "md5.h"
  28 #include "cifs_unicode.h"
  29 #include "cifsproto.h"
  30 #include "ntlmssp.h"
  31 #include <linux/ctype.h>
  32 #include <linux/random.h>
  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  */
  36 /* Note we only use the 1st eight bytes */
  37 /* Note that the smb header signature field on input contains the
  38         sequence number before this function is called */
  39
  40 extern void mdfour(unsigned char *out, unsigned char *in, int n);
  41 extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
  42 extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
  43                        unsigned char *p24);
  44
  45 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
  46                                 struct TCP_Server_Info *server, char *signature)
  47 {
  48         int rc;
  49
  50         if (cifs_pdu == NULL || signature == NULL || server == NULL)
  51                 return -EINVAL;
  52
  53         if (!server->secmech.sdescmd5) {
  54                 cERROR(1, "%s: Can't generate signature\n", __func__);
  55                 return -1;
  56         }
  57
  58         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  59         if (rc) {
  60                 cERROR(1, "%s: Oould not init md5\n", __func__);
  61                 return rc;
  62         }
  63
  64         crypto_shash_update(&server->secmech.sdescmd5->shash,
  65                 server->session_key.response, server->session_key.len);
  66
  67         crypto_shash_update(&server->secmech.sdescmd5->shash,
  68                 cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
  69
  70         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
  71
  72         return 0;
  73 }
  74
  75 /* must be called with server->srv_mutex held */
  76 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
  77                   __u32 *pexpected_response_sequence_number)
  78 {
  79         int rc = 0;
  80         char smb_signature[20];
  81
  82         if ((cifs_pdu == NULL) || (server == NULL))
  83                 return -EINVAL;
  84
  85         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
  86                 return rc;
  87
  88         cifs_pdu->Signature.Sequence.SequenceNumber =
  89                         cpu_to_le32(server->sequence_number);
  90         cifs_pdu->Signature.Sequence.Reserved = 0;
  91
  92         *pexpected_response_sequence_number = server->sequence_number++;
  93         server->sequence_number++;
  94
  95         rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
  96         if (rc)
  97                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
  98         else
  99                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 100
 101         return rc;
 102 }
 103
 104 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 105                                 struct TCP_Server_Info *server, char *signature)
 106 {
 107         int i;
 108         int rc;
 109
 110         if (iov == NULL || signature == NULL || server == NULL)
 111                 return -EINVAL;
 112
 113         if (!server->secmech.sdescmd5) {
 114                 cERROR(1, "%s: Can't generate signature\n", __func__);
 115                 return -1;
 116         }
 117
 118         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 119         if (rc) {
 120                 cERROR(1, "%s: Oould not init md5\n", __func__);
 121                 return rc;
 122         }
 123
 124         crypto_shash_update(&server->secmech.sdescmd5->shash,
 125                 server->session_key.response, server->session_key.len);
 126
 127         for (i = 0; i < n_vec; i++) {
 128                 if (iov[i].iov_len == 0)
 129                         continue;
 130                 if (iov[i].iov_base == NULL) {
 131                         cERROR(1, "null iovec entry");
 132                         return -EIO;
 133                 }
 134                 /* The first entry includes a length field (which does not get
 135                    signed that occupies the first 4 bytes before the header */
 136                 if (i == 0) {
 137                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 138                                 break; /* nothing to sign or corrupt header */
 139                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 140                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 141                 } else
 142                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 143                                 iov[i].iov_base, iov[i].iov_len);
 144         }
 145
 146         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 147
 148         return rc;
 149 }
 150
 151 /* must be called with server->srv_mutex held */
 152 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 153                    __u32 *pexpected_response_sequence_number)
 154 {
 155         int rc = 0;
 156         char smb_signature[20];
 157         struct smb_hdr *cifs_pdu = iov[0].iov_base;
 158
 159         if ((cifs_pdu == NULL) || (server == NULL))
 160                 return -EINVAL;
 161
 162         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
 163                 return rc;
 164
 165         cifs_pdu->Signature.Sequence.SequenceNumber =
 166                                 cpu_to_le32(server->sequence_number);
 167         cifs_pdu->Signature.Sequence.Reserved = 0;
 168
 169         *pexpected_response_sequence_number = server->sequence_number++;
 170         server->sequence_number++;
 171
 172         rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
 173         if (rc)
 174                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 175         else
 176                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 177
 178         return rc;
 179 }
 180
 181 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 182                           struct TCP_Server_Info *server,
 183                           __u32 expected_sequence_number)
 184 {
 185         unsigned int rc;
 186         char server_response_sig[8];
 187         char what_we_think_sig_should_be[20];
 188
 189         if (cifs_pdu == NULL || server == NULL)
 190                 return -EINVAL;
 191
 192         if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
 193                 return 0;
 194
 195         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 196                 struct smb_com_lock_req *pSMB =
 197                         (struct smb_com_lock_req *)cifs_pdu;
 198             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 199                         return 0;
 200         }
 201
 202         /* BB what if signatures are supposed to be on for session but
 203            server does not send one? BB */
 204
 205         /* Do not need to verify session setups with signature "BSRSPYL "  */
 206         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 207                 cFYI(1, "dummy signature received for smb command 0x%x",
 208                         cifs_pdu->Command);
 209
 210         /* save off the origiginal signature so we can modify the smb and check
 211                 its signature against what the server sent */
 212         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 213
 214         cifs_pdu->Signature.Sequence.SequenceNumber =
 215                                         cpu_to_le32(expected_sequence_number);
 216         cifs_pdu->Signature.Sequence.Reserved = 0;
 217
 218         rc = cifs_calculate_signature(cifs_pdu, server,
 219                 what_we_think_sig_should_be);
 220
 221         if (rc)
 222                 return rc;
 223
 224 /*      cifs_dump_mem("what we think it should be: ",
 225                       what_we_think_sig_should_be, 16); */
 226
 227         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 228                 return -EACCES;
 229         else
 230                 return 0;
 231
 232 }
 233
 234 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 235 int setup_ntlm_response(struct cifsSesInfo *ses)
 236 {
 237         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 238         char temp_key[CIFS_SESS_KEY_SIZE];
 239
 240         if (!ses)
 241                 return -EINVAL;
 242
 243         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 244         if (!ses->auth_key.response) {
 245                 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 246                 return -ENOMEM;
 247         }
 248         ses->auth_key.len = temp_len;
 249
 250         SMBNTencrypt(ses->password, ses->server->cryptkey,
 251                         ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 252
 253         E_md4hash(ses->password, temp_key);
 254         mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 255
 256         return 0;
 257 }
 258
 259 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 260 void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 261                         char *lnm_session_key)
 262 {
 263         int i;
 264         char password_with_pad[CIFS_ENCPWD_SIZE];
 265
 266         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 267         if (password)
 268                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 269
 270         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 271                 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 272                 memcpy(lnm_session_key, password_with_pad,
 273                         CIFS_ENCPWD_SIZE);
 274                 return;
 275         }
 276
 277         /* calculate old style session key */
 278         /* calling toupper is less broken than repeatedly
 279         calling nls_toupper would be since that will never
 280         work for UTF8, but neither handles multibyte code pages
 281         but the only alternative would be converting to UCS-16 (Unicode)
 282         (using a routine something like UniStrupr) then
 283         uppercasing and then converting back from Unicode - which
 284         would only worth doing it if we knew it were utf8. Basically
 285         utf8 and other multibyte codepages each need their own strupper
 286         function since a byte at a time will ont work. */
 287
 288         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 289                 password_with_pad[i] = toupper(password_with_pad[i]);
 290
 291         SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 292
 293         /* clear password before we return/free memory */
 294         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 295 }
 296 #endif /* CIFS_WEAK_PW_HASH */
 297
 298 /* Build a proper attribute value/target info pairs blob.
 299  * Fill in netbios and dns domain name and workstation name
 300  * and client time (total five av pairs and + one end of fields indicator.
 301  * Allocate domain name which gets freed when session struct is deallocated.
 302  */
 303 static int
 304 build_avpair_blob(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
 305 {
 306         unsigned int dlen;
 307         unsigned int wlen;
 308         unsigned int size = 6 * sizeof(struct ntlmssp2_name);
 309         __le64  curtime;
 310         char *defdmname = "WORKGROUP";
 311         unsigned char *blobptr;
 312         struct ntlmssp2_name *attrptr;
 313
 314         if (!ses->domainName) {
 315                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 316                 if (!ses->domainName)
 317                         return -ENOMEM;
 318         }
 319
 320         dlen = strlen(ses->domainName);
 321         wlen = strlen(ses->server->hostname);
 322
 323         /* The length of this blob is a size which is
 324          * six times the size of a structure which holds name/size +
 325          * two times the unicode length of a domain name +
 326          * two times the unicode length of a server name +
 327          * size of a timestamp (which is 8 bytes).
 328          */
 329         ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
 330         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 331         if (!ses->auth_key.response) {
 332                 ses->auth_key.len = 0;
 333                 cERROR(1, "Challenge target info allocation failure");
 334                 return -ENOMEM;
 335         }
 336
 337         blobptr = ses->auth_key.response;
 338         attrptr = (struct ntlmssp2_name *) blobptr;
 339
 340         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 341         attrptr->length = cpu_to_le16(2 * dlen);
 342         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 343         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 344
 345         blobptr += 2 * dlen;
 346         attrptr = (struct ntlmssp2_name *) blobptr;
 347
 348         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
 349         attrptr->length = cpu_to_le16(2 * wlen);
 350         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 351         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 352
 353         blobptr += 2 * wlen;
 354         attrptr = (struct ntlmssp2_name *) blobptr;
 355
 356         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
 357         attrptr->length = cpu_to_le16(2 * dlen);
 358         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 359         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 360
 361         blobptr += 2 * dlen;
 362         attrptr = (struct ntlmssp2_name *) blobptr;
 363
 364         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
 365         attrptr->length = cpu_to_le16(2 * wlen);
 366         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 367         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 368
 369         blobptr += 2 * wlen;
 370         attrptr = (struct ntlmssp2_name *) blobptr;
 371
 372         attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
 373         attrptr->length = cpu_to_le16(sizeof(__le64));
 374         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 375         curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 376         memcpy(blobptr, &curtime, sizeof(__le64));
 377
 378         return 0;
 379 }
 380
 381 /* Server has provided av pairs/target info in the type 2 challenge
 382  * packet and we have plucked it and stored within smb session.
 383  * We parse that blob here to find netbios domain name to be used
 384  * as part of ntlmv2 authentication (in Target String), if not already
 385  * specified on the command line.
 386  * If this function returns without any error but without fetching
 387  * domain name, authentication may fail against some server but
 388  * may not fail against other (those who are not very particular
 389  * about target string i.e. for some, just user name might suffice.
 390  */
 391 static int
 392 find_domain_name(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
 393 {
 394         unsigned int attrsize;
 395         unsigned int type;
 396         unsigned int onesize = sizeof(struct ntlmssp2_name);
 397         unsigned char *blobptr;
 398         unsigned char *blobend;
 399         struct ntlmssp2_name *attrptr;
 400
 401         if (!ses->auth_key.len || !ses->auth_key.response)
 402                 return 0;
 403
 404         blobptr = ses->auth_key.response;
 405         blobend = blobptr + ses->auth_key.len;
 406
 407         while (blobptr + onesize < blobend) {
 408                 attrptr = (struct ntlmssp2_name *) blobptr;
 409                 type = le16_to_cpu(attrptr->type);
 410                 if (type == NTLMSSP_AV_EOL)
 411                         break;
 412                 blobptr += 2; /* advance attr type */
 413                 attrsize = le16_to_cpu(attrptr->length);
 414                 blobptr += 2; /* advance attr size */
 415                 if (blobptr + attrsize > blobend)
 416                         break;
 417                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 418                         if (!attrsize)
 419                                 break;
 420                         if (!ses->domainName) {
 421                                 ses->domainName =
 422                                         kmalloc(attrsize + 1, GFP_KERNEL);
 423                                 if (!ses->domainName)
 424                                                 return -ENOMEM;
 425                                 cifs_from_ucs2(ses->domainName,
 426                                         (__le16 *)blobptr, attrsize, attrsize,
 427                                         nls_cp, false);
 428                                 break;
 429                         }
 430                 }
 431                 blobptr += attrsize; /* advance attr  value */
 432         }
 433
 434         return 0;
 435 }
 436
 437 static int calc_ntlmv2_hash(struct cifsSesInfo *ses, char *ntlmv2_hash,
 438                             const struct nls_table *nls_cp)
 439 {
 440         int rc = 0;
 441         int len;
 442         char nt_hash[CIFS_NTHASH_SIZE];
 443         wchar_t *user;
 444         wchar_t *domain;
 445         wchar_t *server;
 446
 447         if (!ses->server->secmech.sdeschmacmd5) {
 448                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 449                 return -1;
 450         }
 451
 452         /* calculate md4 hash of password */
 453         E_md4hash(ses->password, nt_hash);
 454
 455         crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 456                                 CIFS_NTHASH_SIZE);
 457
 458         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 459         if (rc) {
 460                 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
 461                 return rc;
 462         }
 463
 464         /* convert ses->userName to unicode and uppercase */
 465         len = strlen(ses->userName);
 466         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 467         if (user == NULL) {
 468                 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
 469                 rc = -ENOMEM;
 470                 goto calc_exit_2;
 471         }
 472         len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
 473         UniStrupr(user);
 474
 475         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 476                                 (char *)user, 2 * len);
 477
 478         /* convert ses->domainName to unicode and uppercase */
 479         if (ses->domainName) {
 480                 len = strlen(ses->domainName);
 481
 482                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 483                 if (domain == NULL) {
 484                         cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 485                         rc = -ENOMEM;
 486                         goto calc_exit_1;
 487                 }
 488                 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
 489                                         nls_cp);
 490                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 491                                         (char *)domain, 2 * len);
 492                 kfree(domain);
 493         } else if (ses->serverName) {
 494                 len = strlen(ses->serverName);
 495
 496                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 497                 if (server == NULL) {
 498                         cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 499                         rc = -ENOMEM;
 500                         goto calc_exit_1;
 501                 }
 502                 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
 503                                         nls_cp);
 504                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 505                                         (char *)server, 2 * len);
 506                 kfree(server);
 507         }
 508
 509         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 510                                         ntlmv2_hash);
 511
 512 calc_exit_1:
 513         kfree(user);
 514 calc_exit_2:
 515         return rc;
 516 }
 517
 518 static int
 519 CalcNTLMv2_response(const struct cifsSesInfo *ses, char *ntlmv2_hash)
 520 {
 521         int rc;
 522         unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 523
 524         if (!ses->server->secmech.sdeschmacmd5) {
 525                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 526                 return -1;
 527         }
 528
 529         crypto_shash_setkey(ses->server->secmech.hmacmd5,
 530                                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 531
 532         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 533         if (rc) {
 534                 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 535                 return rc;
 536         }
 537
 538         if (ses->server->secType == RawNTLMSSP)
 539                 memcpy(ses->auth_key.response + offset,
 540                         ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 541         else
 542                 memcpy(ses->auth_key.response + offset,
 543                         ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 544         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 545                 ses->auth_key.response + offset, ses->auth_key.len - offset);
 546
 547         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 548                 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 549
 550         return rc;
 551 }
 552
 553
 554 int
 555 setup_ntlmv2_rsp(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
 556 {
 557         int rc;
 558         int baselen;
 559         unsigned int tilen;
 560         struct ntlmv2_resp *buf;
 561         char ntlmv2_hash[16];
 562         unsigned char *tiblob = NULL; /* target info blob */
 563
 564         if (ses->server->secType == RawNTLMSSP) {
 565                 if (!ses->domainName) {
 566                         rc = find_domain_name(ses, nls_cp);
 567                         if (rc) {
 568                                 cERROR(1, "error %d finding domain name", rc);
 569                                 goto setup_ntlmv2_rsp_ret;
 570                         }
 571                 }
 572         } else {
 573                 rc = build_avpair_blob(ses, nls_cp);
 574                 if (rc) {
 575                         cERROR(1, "error %d building av pair blob", rc);
 576                         goto setup_ntlmv2_rsp_ret;
 577                 }
 578         }
 579
 580         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 581         tilen = ses->auth_key.len;
 582         tiblob = ses->auth_key.response;
 583
 584         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 585         if (!ses->auth_key.response) {
 586                 rc = ENOMEM;
 587                 ses->auth_key.len = 0;
 588                 cERROR(1, "%s: Can't allocate auth blob", __func__);
 589                 goto setup_ntlmv2_rsp_ret;
 590         }
 591         ses->auth_key.len += baselen;
 592
 593         buf = (struct ntlmv2_resp *)
 594                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 595         buf->blob_signature = cpu_to_le32(0x00000101);
 596         buf->reserved = 0;
 597         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 598         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 599         buf->reserved2 = 0;
 600
 601         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 602
 603         /* calculate ntlmv2_hash */
 604         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 605         if (rc) {
 606                 cERROR(1, "could not get v2 hash rc %d", rc);
 607                 goto setup_ntlmv2_rsp_ret;
 608         }
 609
 610         /* calculate first part of the client response (CR1) */
 611         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 612         if (rc) {
 613                 cERROR(1, "Could not calculate CR1  rc: %d", rc);
 614                 goto setup_ntlmv2_rsp_ret;
 615         }
 616
 617         /* now calculate the session key for NTLMv2 */
 618         crypto_shash_setkey(ses->server->secmech.hmacmd5,
 619                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 620
 621         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 622         if (rc) {
 623                 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
 624                 goto setup_ntlmv2_rsp_ret;
 625         }
 626
 627         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 628                 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 629                 CIFS_HMAC_MD5_HASH_SIZE);
 630
 631         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 632                 ses->auth_key.response);
 633
 634 setup_ntlmv2_rsp_ret:
 635         kfree(tiblob);
 636
 637         return rc;
 638 }
 639
 640 int
 641 calc_seckey(struct cifsSesInfo *ses)
 642 {
 643         int rc;
 644         struct crypto_blkcipher *tfm_arc4;
 645         struct scatterlist sgin, sgout;
 646         struct blkcipher_desc desc;
 647         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 648
 649         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 650
 651         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 652         if (!tfm_arc4 || IS_ERR(tfm_arc4)) {
 653                 cERROR(1, "could not allocate crypto API arc4\n");
 654                 return PTR_ERR(tfm_arc4);
 655         }
 656
 657         desc.tfm = tfm_arc4;
 658
 659         crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 660                                         CIFS_SESS_KEY_SIZE);
 661
 662         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 663         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 664
 665         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 666         if (rc) {
 667                 cERROR(1, "could not encrypt session key rc: %d\n", rc);
 668                 crypto_free_blkcipher(tfm_arc4);
 669                 return rc;
 670         }
 671
 672         /* make secondary_key/nonce as session key */
 673         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 674         /* and make len as that of session key only */
 675         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 676
 677         crypto_free_blkcipher(tfm_arc4);
 678
 679         return 0;
 680 }
 681
 682 void
 683 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 684 {
 685         if (server->secmech.md5)
 686                 crypto_free_shash(server->secmech.md5);
 687
 688         if (server->secmech.hmacmd5)
 689                 crypto_free_shash(server->secmech.hmacmd5);
 690
 691         kfree(server->secmech.sdeschmacmd5);
 692
 693         kfree(server->secmech.sdescmd5);
 694 }
 695
 696 int
 697 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 698 {
 699         int rc;
 700         unsigned int size;
 701
 702         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 703         if (!server->secmech.hmacmd5 ||
 704                         IS_ERR(server->secmech.hmacmd5)) {
 705                 cERROR(1, "could not allocate crypto hmacmd5\n");
 706                 return PTR_ERR(server->secmech.hmacmd5);
 707         }
 708
 709         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 710         if (!server->secmech.md5 || IS_ERR(server->secmech.md5)) {
 711                 cERROR(1, "could not allocate crypto md5\n");
 712                 rc = PTR_ERR(server->secmech.md5);
 713                 goto crypto_allocate_md5_fail;
 714         }
 715
 716         size = sizeof(struct shash_desc) +
 717                         crypto_shash_descsize(server->secmech.hmacmd5);
 718         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 719         if (!server->secmech.sdeschmacmd5) {
 720                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
 721                 rc = -ENOMEM;
 722                 goto crypto_allocate_hmacmd5_sdesc_fail;
 723         }
 724         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 725         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 726
 727
 728         size = sizeof(struct shash_desc) +
 729                         crypto_shash_descsize(server->secmech.md5);
 730         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 731         if (!server->secmech.sdescmd5) {
 732                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
 733                 rc = -ENOMEM;
 734                 goto crypto_allocate_md5_sdesc_fail;
 735         }
 736         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 737         server->secmech.sdescmd5->shash.flags = 0x0;
 738
 739         return 0;
 740
 741 crypto_allocate_md5_sdesc_fail:
 742         kfree(server->secmech.sdeschmacmd5);
 743
 744 crypto_allocate_hmacmd5_sdesc_fail:
 745         crypto_free_shash(server->secmech.md5);
 746
 747 crypto_allocate_md5_fail:
 748         crypto_free_shash(server->secmech.hmacmd5);
 749
 750         return rc;
 751 }