fs/cifs/cifsencrypt.c

   1 /*
   2  *   fs/cifs/cifsencrypt.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2005,2006
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/slab.h>
  24 #include "cifspdu.h"
  25 #include "cifsglob.h"
  26 #include "cifs_debug.h"
  27 #include "cifs_unicode.h"
  28 #include "cifsproto.h"
  29 #include "ntlmssp.h"
  30 #include <linux/ctype.h>
  31 #include <linux/random.h>
  32
  33 /*
  34  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
  35  * The 16 byte signature must be allocated by the caller. Note we only use the
  36  * 1st eight bytes and that the smb header signature field on input contains
  37  * the sequence number before this function is called. Also, this function
  38  * should be called with the server->srv_mutex held.
  39  */
  40 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
  41                                 struct TCP_Server_Info *server, char *signature)
  42 {
  43         int rc;
  44
  45         if (cifs_pdu == NULL || signature == NULL || server == NULL)
  46                 return -EINVAL;
  47
  48         if (!server->secmech.sdescmd5) {
  49                 cERROR(1, "%s: Can't generate signature\n", __func__);
  50                 return -1;
  51         }
  52
  53         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  54         if (rc) {
  55                 cERROR(1, "%s: Could not init md5\n", __func__);
  56                 return rc;
  57         }
  58
  59         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  60                 server->session_key.response, server->session_key.len);
  61         if (rc) {
  62                 cERROR(1, "%s: Could not update with response\n", __func__);
  63                 return rc;
  64         }
  65
  66         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  67                 cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
  68         if (rc) {
  69                 cERROR(1, "%s: Could not update with payload\n", __func__);
  70                 return rc;
  71         }
  72
  73         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
  74         if (rc)
  75                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
  76
  77         return rc;
  78 }
  79
  80 /* must be called with server->srv_mutex held */
  81 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
  82                   __u32 *pexpected_response_sequence_number)
  83 {
  84         int rc = 0;
  85         char smb_signature[20];
  86
  87         if ((cifs_pdu == NULL) || (server == NULL))
  88                 return -EINVAL;
  89
  90         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
  91             server->tcpStatus == CifsNeedNegotiate)
  92                 return rc;
  93
  94         if (!server->session_estab) {
  95                 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
  96                 return rc;
  97         }
  98
  99         cifs_pdu->Signature.Sequence.SequenceNumber =
 100                         cpu_to_le32(server->sequence_number);
 101         cifs_pdu->Signature.Sequence.Reserved = 0;
 102
 103         *pexpected_response_sequence_number = server->sequence_number++;
 104         server->sequence_number++;
 105
 106         rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
 107         if (rc)
 108                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 109         else
 110                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 111
 112         return rc;
 113 }
 114
 115 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 116                                 struct TCP_Server_Info *server, char *signature)
 117 {
 118         int i;
 119         int rc;
 120
 121         if (iov == NULL || signature == NULL || server == NULL)
 122                 return -EINVAL;
 123
 124         if (!server->secmech.sdescmd5) {
 125                 cERROR(1, "%s: Can't generate signature\n", __func__);
 126                 return -1;
 127         }
 128
 129         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 130         if (rc) {
 131                 cERROR(1, "%s: Could not init md5\n", __func__);
 132                 return rc;
 133         }
 134
 135         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
 136                 server->session_key.response, server->session_key.len);
 137         if (rc) {
 138                 cERROR(1, "%s: Could not update with response\n", __func__);
 139                 return rc;
 140         }
 141
 142         for (i = 0; i < n_vec; i++) {
 143                 if (iov[i].iov_len == 0)
 144                         continue;
 145                 if (iov[i].iov_base == NULL) {
 146                         cERROR(1, "null iovec entry");
 147                         return -EIO;
 148                 }
 149                 /* The first entry includes a length field (which does not get
 150                    signed that occupies the first 4 bytes before the header */
 151                 if (i == 0) {
 152                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 153                                 break; /* nothing to sign or corrupt header */
 154                         rc =
 155                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 156                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 157                 } else {
 158                         rc =
 159                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 160                                 iov[i].iov_base, iov[i].iov_len);
 161                 }
 162                 if (rc) {
 163                         cERROR(1, "%s: Could not update with payload\n",
 164                                                         __func__);
 165                         return rc;
 166                 }
 167         }
 168
 169         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 170         if (rc)
 171                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 172
 173         return rc;
 174 }
 175
 176 /* must be called with server->srv_mutex held */
 177 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 178                    __u32 *pexpected_response_sequence_number)
 179 {
 180         int rc = 0;
 181         char smb_signature[20];
 182         struct smb_hdr *cifs_pdu = iov[0].iov_base;
 183
 184         if ((cifs_pdu == NULL) || (server == NULL))
 185                 return -EINVAL;
 186
 187         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 188             server->tcpStatus == CifsNeedNegotiate)
 189                 return rc;
 190
 191         if (!server->session_estab) {
 192                 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 193                 return rc;
 194         }
 195
 196         cifs_pdu->Signature.Sequence.SequenceNumber =
 197                                 cpu_to_le32(server->sequence_number);
 198         cifs_pdu->Signature.Sequence.Reserved = 0;
 199
 200         *pexpected_response_sequence_number = server->sequence_number++;
 201         server->sequence_number++;
 202
 203         rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
 204         if (rc)
 205                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 206         else
 207                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 208
 209         return rc;
 210 }
 211
 212 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 213                           struct TCP_Server_Info *server,
 214                           __u32 expected_sequence_number)
 215 {
 216         unsigned int rc;
 217         char server_response_sig[8];
 218         char what_we_think_sig_should_be[20];
 219
 220         if (cifs_pdu == NULL || server == NULL)
 221                 return -EINVAL;
 222
 223         if (!server->session_estab)
 224                 return 0;
 225
 226         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 227                 struct smb_com_lock_req *pSMB =
 228                         (struct smb_com_lock_req *)cifs_pdu;
 229             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 230                         return 0;
 231         }
 232
 233         /* BB what if signatures are supposed to be on for session but
 234            server does not send one? BB */
 235
 236         /* Do not need to verify session setups with signature "BSRSPYL "  */
 237         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 238                 cFYI(1, "dummy signature received for smb command 0x%x",
 239                         cifs_pdu->Command);
 240
 241         /* save off the origiginal signature so we can modify the smb and check
 242                 its signature against what the server sent */
 243         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 244
 245         cifs_pdu->Signature.Sequence.SequenceNumber =
 246                                         cpu_to_le32(expected_sequence_number);
 247         cifs_pdu->Signature.Sequence.Reserved = 0;
 248
 249         mutex_lock(&server->srv_mutex);
 250         rc = cifs_calculate_signature(cifs_pdu, server,
 251                 what_we_think_sig_should_be);
 252         mutex_unlock(&server->srv_mutex);
 253
 254         if (rc)
 255                 return rc;
 256
 257 /*      cifs_dump_mem("what we think it should be: ",
 258                       what_we_think_sig_should_be, 16); */
 259
 260         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 261                 return -EACCES;
 262         else
 263                 return 0;
 264
 265 }
 266
 267 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 268 int setup_ntlm_response(struct cifs_ses *ses)
 269 {
 270         int rc = 0;
 271         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 272         char temp_key[CIFS_SESS_KEY_SIZE];
 273
 274         if (!ses)
 275                 return -EINVAL;
 276
 277         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 278         if (!ses->auth_key.response) {
 279                 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 280                 return -ENOMEM;
 281         }
 282         ses->auth_key.len = temp_len;
 283
 284         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 285                         ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 286         if (rc) {
 287                 cFYI(1, "%s Can't generate NTLM response, error: %d",
 288                         __func__, rc);
 289                 return rc;
 290         }
 291
 292         rc = E_md4hash(ses->password, temp_key);
 293         if (rc) {
 294                 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
 295                 return rc;
 296         }
 297
 298         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 299         if (rc)
 300                 cFYI(1, "%s Can't generate NTLM session key, error: %d",
 301                         __func__, rc);
 302
 303         return rc;
 304 }
 305
 306 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 307 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 308                         char *lnm_session_key)
 309 {
 310         int i;
 311         int rc;
 312         char password_with_pad[CIFS_ENCPWD_SIZE];
 313
 314         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 315         if (password)
 316                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 317
 318         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 319                 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 320                 memcpy(lnm_session_key, password_with_pad,
 321                         CIFS_ENCPWD_SIZE);
 322                 return 0;
 323         }
 324
 325         /* calculate old style session key */
 326         /* calling toupper is less broken than repeatedly
 327         calling nls_toupper would be since that will never
 328         work for UTF8, but neither handles multibyte code pages
 329         but the only alternative would be converting to UCS-16 (Unicode)
 330         (using a routine something like UniStrupr) then
 331         uppercasing and then converting back from Unicode - which
 332         would only worth doing it if we knew it were utf8. Basically
 333         utf8 and other multibyte codepages each need their own strupper
 334         function since a byte at a time will ont work. */
 335
 336         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 337                 password_with_pad[i] = toupper(password_with_pad[i]);
 338
 339         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 340
 341         return rc;
 342 }
 343 #endif /* CIFS_WEAK_PW_HASH */
 344
 345 /* Build a proper attribute value/target info pairs blob.
 346  * Fill in netbios and dns domain name and workstation name
 347  * and client time (total five av pairs and + one end of fields indicator.
 348  * Allocate domain name which gets freed when session struct is deallocated.
 349  */
 350 static int
 351 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 352 {
 353         unsigned int dlen;
 354         unsigned int wlen;
 355         unsigned int size = 6 * sizeof(struct ntlmssp2_name);
 356         __le64  curtime;
 357         char *defdmname = "WORKGROUP";
 358         unsigned char *blobptr;
 359         struct ntlmssp2_name *attrptr;
 360
 361         if (!ses->domainName) {
 362                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 363                 if (!ses->domainName)
 364                         return -ENOMEM;
 365         }
 366
 367         dlen = strlen(ses->domainName);
 368         wlen = strlen(ses->server->hostname);
 369
 370         /* The length of this blob is a size which is
 371          * six times the size of a structure which holds name/size +
 372          * two times the unicode length of a domain name +
 373          * two times the unicode length of a server name +
 374          * size of a timestamp (which is 8 bytes).
 375          */
 376         ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
 377         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 378         if (!ses->auth_key.response) {
 379                 ses->auth_key.len = 0;
 380                 cERROR(1, "Challenge target info allocation failure");
 381                 return -ENOMEM;
 382         }
 383
 384         blobptr = ses->auth_key.response;
 385         attrptr = (struct ntlmssp2_name *) blobptr;
 386
 387         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 388         attrptr->length = cpu_to_le16(2 * dlen);
 389         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 390         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 391
 392         blobptr += 2 * dlen;
 393         attrptr = (struct ntlmssp2_name *) blobptr;
 394
 395         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
 396         attrptr->length = cpu_to_le16(2 * wlen);
 397         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 398         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 399
 400         blobptr += 2 * wlen;
 401         attrptr = (struct ntlmssp2_name *) blobptr;
 402
 403         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
 404         attrptr->length = cpu_to_le16(2 * dlen);
 405         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 406         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 407
 408         blobptr += 2 * dlen;
 409         attrptr = (struct ntlmssp2_name *) blobptr;
 410
 411         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
 412         attrptr->length = cpu_to_le16(2 * wlen);
 413         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 414         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 415
 416         blobptr += 2 * wlen;
 417         attrptr = (struct ntlmssp2_name *) blobptr;
 418
 419         attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
 420         attrptr->length = cpu_to_le16(sizeof(__le64));
 421         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 422         curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 423         memcpy(blobptr, &curtime, sizeof(__le64));
 424
 425         return 0;
 426 }
 427
 428 /* Server has provided av pairs/target info in the type 2 challenge
 429  * packet and we have plucked it and stored within smb session.
 430  * We parse that blob here to find netbios domain name to be used
 431  * as part of ntlmv2 authentication (in Target String), if not already
 432  * specified on the command line.
 433  * If this function returns without any error but without fetching
 434  * domain name, authentication may fail against some server but
 435  * may not fail against other (those who are not very particular
 436  * about target string i.e. for some, just user name might suffice.
 437  */
 438 static int
 439 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 440 {
 441         unsigned int attrsize;
 442         unsigned int type;
 443         unsigned int onesize = sizeof(struct ntlmssp2_name);
 444         unsigned char *blobptr;
 445         unsigned char *blobend;
 446         struct ntlmssp2_name *attrptr;
 447
 448         if (!ses->auth_key.len || !ses->auth_key.response)
 449                 return 0;
 450
 451         blobptr = ses->auth_key.response;
 452         blobend = blobptr + ses->auth_key.len;
 453
 454         while (blobptr + onesize < blobend) {
 455                 attrptr = (struct ntlmssp2_name *) blobptr;
 456                 type = le16_to_cpu(attrptr->type);
 457                 if (type == NTLMSSP_AV_EOL)
 458                         break;
 459                 blobptr += 2; /* advance attr type */
 460                 attrsize = le16_to_cpu(attrptr->length);
 461                 blobptr += 2; /* advance attr size */
 462                 if (blobptr + attrsize > blobend)
 463                         break;
 464                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 465                         if (!attrsize)
 466                                 break;
 467                         if (!ses->domainName) {
 468                                 ses->domainName =
 469                                         kmalloc(attrsize + 1, GFP_KERNEL);
 470                                 if (!ses->domainName)
 471                                                 return -ENOMEM;
 472                                 cifs_from_ucs2(ses->domainName,
 473                                         (__le16 *)blobptr, attrsize, attrsize,
 474                                         nls_cp, false);
 475                                 break;
 476                         }
 477                 }
 478                 blobptr += attrsize; /* advance attr  value */
 479         }
 480
 481         return 0;
 482 }
 483
 484 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 485                             const struct nls_table *nls_cp)
 486 {
 487         int rc = 0;
 488         int len;
 489         char nt_hash[CIFS_NTHASH_SIZE];
 490         wchar_t *user;
 491         wchar_t *domain;
 492         wchar_t *server;
 493
 494         if (!ses->server->secmech.sdeschmacmd5) {
 495                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 496                 return -1;
 497         }
 498
 499         /* calculate md4 hash of password */
 500         E_md4hash(ses->password, nt_hash);
 501
 502         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 503                                 CIFS_NTHASH_SIZE);
 504         if (rc) {
 505                 cERROR(1, "%s: Could not set NT Hash as a key", __func__);
 506                 return rc;
 507         }
 508
 509         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 510         if (rc) {
 511                 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
 512                 return rc;
 513         }
 514
 515         /* convert ses->user_name to unicode and uppercase */
 516         len = strlen(ses->user_name);
 517         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 518         if (user == NULL) {
 519                 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
 520                 rc = -ENOMEM;
 521                 return rc;
 522         }
 523         len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
 524         UniStrupr(user);
 525
 526         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 527                                 (char *)user, 2 * len);
 528         kfree(user);
 529         if (rc) {
 530                 cERROR(1, "%s: Could not update with user\n", __func__);
 531                 return rc;
 532         }
 533
 534         /* convert ses->domainName to unicode and uppercase */
 535         if (ses->domainName) {
 536                 len = strlen(ses->domainName);
 537
 538                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 539                 if (domain == NULL) {
 540                         cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 541                         rc = -ENOMEM;
 542                         return rc;
 543                 }
 544                 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
 545                                         nls_cp);
 546                 rc =
 547                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 548                                         (char *)domain, 2 * len);
 549                 kfree(domain);
 550                 if (rc) {
 551                         cERROR(1, "%s: Could not update with domain\n",
 552                                                                 __func__);
 553                         return rc;
 554                 }
 555         } else if (ses->serverName) {
 556                 len = strlen(ses->serverName);
 557
 558                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 559                 if (server == NULL) {
 560                         cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 561                         rc = -ENOMEM;
 562                         return rc;
 563                 }
 564                 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
 565                                         nls_cp);
 566                 rc =
 567                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 568                                         (char *)server, 2 * len);
 569                 kfree(server);
 570                 if (rc) {
 571                         cERROR(1, "%s: Could not update with server\n",
 572                                                                 __func__);
 573                         return rc;
 574                 }
 575         }
 576
 577         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 578                                         ntlmv2_hash);
 579         if (rc)
 580                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 581
 582         return rc;
 583 }
 584
 585 static int
 586 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 587 {
 588         int rc;
 589         unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 590
 591         if (!ses->server->secmech.sdeschmacmd5) {
 592                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 593                 return -1;
 594         }
 595
 596         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 597                                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 598         if (rc) {
 599                 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 600                 return rc;
 601         }
 602
 603         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 604         if (rc) {
 605                 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 606                 return rc;
 607         }
 608
 609         if (ses->server->secType == RawNTLMSSP)
 610                 memcpy(ses->auth_key.response + offset,
 611                         ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 612         else
 613                 memcpy(ses->auth_key.response + offset,
 614                         ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 615         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 616                 ses->auth_key.response + offset, ses->auth_key.len - offset);
 617         if (rc) {
 618                 cERROR(1, "%s: Could not update with response\n", __func__);
 619                 return rc;
 620         }
 621
 622         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 623                 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 624         if (rc)
 625                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 626
 627         return rc;
 628 }
 629
 630
 631 int
 632 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 633 {
 634         int rc;
 635         int baselen;
 636         unsigned int tilen;
 637         struct ntlmv2_resp *buf;
 638         char ntlmv2_hash[16];
 639         unsigned char *tiblob = NULL; /* target info blob */
 640
 641         if (ses->server->secType == RawNTLMSSP) {
 642                 if (!ses->domainName) {
 643                         rc = find_domain_name(ses, nls_cp);
 644                         if (rc) {
 645                                 cERROR(1, "error %d finding domain name", rc);
 646                                 goto setup_ntlmv2_rsp_ret;
 647                         }
 648                 }
 649         } else {
 650                 rc = build_avpair_blob(ses, nls_cp);
 651                 if (rc) {
 652                         cERROR(1, "error %d building av pair blob", rc);
 653                         goto setup_ntlmv2_rsp_ret;
 654                 }
 655         }
 656
 657         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 658         tilen = ses->auth_key.len;
 659         tiblob = ses->auth_key.response;
 660
 661         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 662         if (!ses->auth_key.response) {
 663                 rc = ENOMEM;
 664                 ses->auth_key.len = 0;
 665                 cERROR(1, "%s: Can't allocate auth blob", __func__);
 666                 goto setup_ntlmv2_rsp_ret;
 667         }
 668         ses->auth_key.len += baselen;
 669
 670         buf = (struct ntlmv2_resp *)
 671                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 672         buf->blob_signature = cpu_to_le32(0x00000101);
 673         buf->reserved = 0;
 674         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 675         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 676         buf->reserved2 = 0;
 677
 678         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 679
 680         /* calculate ntlmv2_hash */
 681         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 682         if (rc) {
 683                 cERROR(1, "could not get v2 hash rc %d", rc);
 684                 goto setup_ntlmv2_rsp_ret;
 685         }
 686
 687         /* calculate first part of the client response (CR1) */
 688         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 689         if (rc) {
 690                 cERROR(1, "Could not calculate CR1  rc: %d", rc);
 691                 goto setup_ntlmv2_rsp_ret;
 692         }
 693
 694         /* now calculate the session key for NTLMv2 */
 695         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 696                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 697         if (rc) {
 698                 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 699                 goto setup_ntlmv2_rsp_ret;
 700         }
 701
 702         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 703         if (rc) {
 704                 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
 705                 goto setup_ntlmv2_rsp_ret;
 706         }
 707
 708         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 709                 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 710                 CIFS_HMAC_MD5_HASH_SIZE);
 711         if (rc) {
 712                 cERROR(1, "%s: Could not update with response\n", __func__);
 713                 goto setup_ntlmv2_rsp_ret;
 714         }
 715
 716         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 717                 ses->auth_key.response);
 718         if (rc)
 719                 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
 720
 721 setup_ntlmv2_rsp_ret:
 722         kfree(tiblob);
 723
 724         return rc;
 725 }
 726
 727 int
 728 calc_seckey(struct cifs_ses *ses)
 729 {
 730         int rc;
 731         struct crypto_blkcipher *tfm_arc4;
 732         struct scatterlist sgin, sgout;
 733         struct blkcipher_desc desc;
 734         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 735
 736         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 737
 738         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 739         if (IS_ERR(tfm_arc4)) {
 740                 rc = PTR_ERR(tfm_arc4);
 741                 cERROR(1, "could not allocate crypto API arc4\n");
 742                 return rc;
 743         }
 744
 745         desc.tfm = tfm_arc4;
 746
 747         rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 748                                         CIFS_SESS_KEY_SIZE);
 749         if (rc) {
 750                 cERROR(1, "%s: Could not set response as a key", __func__);
 751                 return rc;
 752         }
 753
 754         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 755         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 756
 757         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 758         if (rc) {
 759                 cERROR(1, "could not encrypt session key rc: %d\n", rc);
 760                 crypto_free_blkcipher(tfm_arc4);
 761                 return rc;
 762         }
 763
 764         /* make secondary_key/nonce as session key */
 765         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 766         /* and make len as that of session key only */
 767         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 768
 769         crypto_free_blkcipher(tfm_arc4);
 770
 771         return rc;
 772 }
 773
 774 void
 775 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 776 {
 777         if (server->secmech.md5)
 778                 crypto_free_shash(server->secmech.md5);
 779
 780         if (server->secmech.hmacmd5)
 781                 crypto_free_shash(server->secmech.hmacmd5);
 782
 783         kfree(server->secmech.sdeschmacmd5);
 784
 785         kfree(server->secmech.sdescmd5);
 786 }
 787
 788 int
 789 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 790 {
 791         int rc;
 792         unsigned int size;
 793
 794         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 795         if (IS_ERR(server->secmech.hmacmd5)) {
 796                 cERROR(1, "could not allocate crypto hmacmd5\n");
 797                 return PTR_ERR(server->secmech.hmacmd5);
 798         }
 799
 800         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 801         if (IS_ERR(server->secmech.md5)) {
 802                 cERROR(1, "could not allocate crypto md5\n");
 803                 rc = PTR_ERR(server->secmech.md5);
 804                 goto crypto_allocate_md5_fail;
 805         }
 806
 807         size = sizeof(struct shash_desc) +
 808                         crypto_shash_descsize(server->secmech.hmacmd5);
 809         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 810         if (!server->secmech.sdeschmacmd5) {
 811                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
 812                 rc = -ENOMEM;
 813                 goto crypto_allocate_hmacmd5_sdesc_fail;
 814         }
 815         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 816         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 817
 818
 819         size = sizeof(struct shash_desc) +
 820                         crypto_shash_descsize(server->secmech.md5);
 821         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 822         if (!server->secmech.sdescmd5) {
 823                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
 824                 rc = -ENOMEM;
 825                 goto crypto_allocate_md5_sdesc_fail;
 826         }
 827         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 828         server->secmech.sdescmd5->shash.flags = 0x0;
 829
 830         return 0;
 831
 832 crypto_allocate_md5_sdesc_fail:
 833         kfree(server->secmech.sdeschmacmd5);
 834
 835 crypto_allocate_hmacmd5_sdesc_fail:
 836         crypto_free_shash(server->secmech.md5);
 837
 838 crypto_allocate_md5_fail:
 839         crypto_free_shash(server->secmech.hmacmd5);
 840
 841         return rc;
 842 }