fs/cifs/sess.c

   1 /*
   2  *   fs/cifs/sess.c
   3  *
   4  *   SMB/CIFS session setup handling routines
   5  *
   6  *   Copyright (c) International Business Machines  Corp., 2006, 2007
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include "cifspdu.h"
  25 #include "cifsglob.h"
  26 #include "cifsproto.h"
  27 #include "cifs_unicode.h"
  28 #include "cifs_debug.h"
  29 #include "ntlmssp.h"
  30 #include "nterr.h"
  31 #include <linux/utsname.h>
  32 #include "cifs_spnego.h"
  33
  34 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  35                          unsigned char *p24);
  36
  37 static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
  38 {
  39         __u32 capabilities = 0;
  40
  41         /* init fields common to all four types of SessSetup */
  42         /* note that header is initialized to zero in header_assemble */
  43         pSMB->req.AndXCommand = 0xFF;
  44         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
  45         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
  46
  47         /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
  48
  49         /* BB verify whether signing required on neg or just on auth frame
  50            (and NTLM case) */
  51
  52         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
  53                         CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
  54
  55         if (ses->server->secMode &
  56             (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
  57                 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
  58
  59         if (ses->capabilities & CAP_UNICODE) {
  60                 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
  61                 capabilities |= CAP_UNICODE;
  62         }
  63         if (ses->capabilities & CAP_STATUS32) {
  64                 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
  65                 capabilities |= CAP_STATUS32;
  66         }
  67         if (ses->capabilities & CAP_DFS) {
  68                 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
  69                 capabilities |= CAP_DFS;
  70         }
  71         if (ses->capabilities & CAP_UNIX)
  72                 capabilities |= CAP_UNIX;
  73
  74         /* BB check whether to init vcnum BB */
  75         return capabilities;
  76 }
  77
  78 static void
  79 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
  80 {
  81         char *bcc_ptr = *pbcc_area;
  82         int bytes_ret = 0;
  83
  84         /* Copy OS version */
  85         bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
  86                                   nls_cp);
  87         bcc_ptr += 2 * bytes_ret;
  88         bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, init_utsname()->release,
  89                                   32, nls_cp);
  90         bcc_ptr += 2 * bytes_ret;
  91         bcc_ptr += 2; /* trailing null */
  92
  93         bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
  94                                   32, nls_cp);
  95         bcc_ptr += 2 * bytes_ret;
  96         bcc_ptr += 2; /* trailing null */
  97
  98         *pbcc_area = bcc_ptr;
  99 }
 100
 101 static void unicode_domain_string(char **pbcc_area, struct cifsSesInfo *ses,
 102                                    const struct nls_table *nls_cp)
 103 {
 104         char *bcc_ptr = *pbcc_area;
 105         int bytes_ret = 0;
 106
 107         /* copy domain */
 108         if (ses->domainName == NULL) {
 109                 /* Sending null domain better than using a bogus domain name (as
 110                 we did briefly in 2.6.18) since server will use its default */
 111                 *bcc_ptr = 0;
 112                 *(bcc_ptr+1) = 0;
 113                 bytes_ret = 0;
 114         } else
 115                 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName,
 116                                           256, nls_cp);
 117         bcc_ptr += 2 * bytes_ret;
 118         bcc_ptr += 2;  /* account for null terminator */
 119
 120         *pbcc_area = bcc_ptr;
 121 }
 122
 123
 124 static void unicode_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses,
 125                                    const struct nls_table *nls_cp)
 126 {
 127         char *bcc_ptr = *pbcc_area;
 128         int bytes_ret = 0;
 129
 130         /* BB FIXME add check that strings total less
 131         than 335 or will need to send them as arrays */
 132
 133         /* unicode strings, must be word aligned before the call */
 134 /*      if ((long) bcc_ptr % 2) {
 135                 *bcc_ptr = 0;
 136                 bcc_ptr++;
 137         } */
 138         /* copy user */
 139         if (ses->userName == NULL) {
 140                 /* null user mount */
 141                 *bcc_ptr = 0;
 142                 *(bcc_ptr+1) = 0;
 143         } else { /* 300 should be long enough for any conceivable user name */
 144                 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName,
 145                                           300, nls_cp);
 146         }
 147         bcc_ptr += 2 * bytes_ret;
 148         bcc_ptr += 2; /* account for null termination */
 149
 150         unicode_domain_string(&bcc_ptr, ses, nls_cp);
 151         unicode_oslm_strings(&bcc_ptr, nls_cp);
 152
 153         *pbcc_area = bcc_ptr;
 154 }
 155
 156 static void ascii_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses,
 157                                  const struct nls_table *nls_cp)
 158 {
 159         char *bcc_ptr = *pbcc_area;
 160
 161         /* copy user */
 162         /* BB what about null user mounts - check that we do this BB */
 163         /* copy user */
 164         if (ses->userName == NULL) {
 165                 /* BB what about null user mounts - check that we do this BB */
 166         } else { /* 300 should be long enough for any conceivable user name */
 167                 strncpy(bcc_ptr, ses->userName, 300);
 168         }
 169         /* BB improve check for overflow */
 170         bcc_ptr += strnlen(ses->userName, 300);
 171         *bcc_ptr = 0;
 172         bcc_ptr++; /* account for null termination */
 173
 174         /* copy domain */
 175
 176         if (ses->domainName != NULL) {
 177                 strncpy(bcc_ptr, ses->domainName, 256);
 178                 bcc_ptr += strnlen(ses->domainName, 256);
 179         } /* else we will send a null domain name
 180              so the server will default to its own domain */
 181         *bcc_ptr = 0;
 182         bcc_ptr++;
 183
 184         /* BB check for overflow here */
 185
 186         strcpy(bcc_ptr, "Linux version ");
 187         bcc_ptr += strlen("Linux version ");
 188         strcpy(bcc_ptr, init_utsname()->release);
 189         bcc_ptr += strlen(init_utsname()->release) + 1;
 190
 191         strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
 192         bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
 193
 194         *pbcc_area = bcc_ptr;
 195 }
 196
 197 static int decode_unicode_ssetup(char **pbcc_area, int bleft,
 198                                  struct cifsSesInfo *ses,
 199                                  const struct nls_table *nls_cp)
 200 {
 201         int rc = 0;
 202         int words_left, len;
 203         char *data = *pbcc_area;
 204
 205
 206
 207         cFYI(1, ("bleft %d", bleft));
 208
 209
 210         /* SMB header is unaligned, so cifs servers word align start of
 211            Unicode strings */
 212         data++;
 213         bleft--; /* Windows servers do not always double null terminate
 214                     their final Unicode string - in which case we
 215                     now will not attempt to decode the byte of junk
 216                     which follows it */
 217
 218         words_left = bleft / 2;
 219
 220         /* save off server operating system */
 221         len = UniStrnlen((wchar_t *) data, words_left);
 222
 223 /* We look for obvious messed up bcc or strings in response so we do not go off
 224    the end since (at least) WIN2K and Windows XP have a major bug in not null
 225    terminating last Unicode string in response  */
 226         if (len >= words_left)
 227                 return rc;
 228
 229         kfree(ses->serverOS);
 230         /* UTF-8 string will not grow more than four times as big as UCS-16 */
 231         ses->serverOS = kzalloc(4 * len, GFP_KERNEL);
 232         if (ses->serverOS != NULL)
 233                 cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len, nls_cp);
 234         data += 2 * (len + 1);
 235         words_left -= len + 1;
 236
 237         /* save off server network operating system */
 238         len = UniStrnlen((wchar_t *) data, words_left);
 239
 240         if (len >= words_left)
 241                 return rc;
 242
 243         kfree(ses->serverNOS);
 244         ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */
 245         if (ses->serverNOS != NULL) {
 246                 cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
 247                                    nls_cp);
 248                 if (strncmp(ses->serverNOS, "NT LAN Manager 4", 16) == 0) {
 249                         cFYI(1, ("NT4 server"));
 250                         ses->flags |= CIFS_SES_NT4;
 251                 }
 252         }
 253         data += 2 * (len + 1);
 254         words_left -= len + 1;
 255
 256         /* save off server domain */
 257         len = UniStrnlen((wchar_t *) data, words_left);
 258
 259         if (len > words_left)
 260                 return rc;
 261
 262         kfree(ses->serverDomain);
 263         ses->serverDomain = kzalloc(2 * (len + 1), GFP_KERNEL); /* BB FIXME wrong length */
 264         if (ses->serverDomain != NULL) {
 265                 cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len,
 266                                    nls_cp);
 267                 ses->serverDomain[2*len] = 0;
 268                 ses->serverDomain[(2*len) + 1] = 0;
 269         }
 270         data += 2 * (len + 1);
 271         words_left -= len + 1;
 272
 273         cFYI(1, ("words left: %d", words_left));
 274
 275         return rc;
 276 }
 277
 278 static int decode_ascii_ssetup(char **pbcc_area, int bleft,
 279                                struct cifsSesInfo *ses,
 280                                const struct nls_table *nls_cp)
 281 {
 282         int rc = 0;
 283         int len;
 284         char *bcc_ptr = *pbcc_area;
 285
 286         cFYI(1, ("decode sessetup ascii. bleft %d", bleft));
 287
 288         len = strnlen(bcc_ptr, bleft);
 289         if (len >= bleft)
 290                 return rc;
 291
 292         kfree(ses->serverOS);
 293
 294         ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
 295         if (ses->serverOS)
 296                 strncpy(ses->serverOS, bcc_ptr, len);
 297         if (strncmp(ses->serverOS, "OS/2", 4) == 0) {
 298                         cFYI(1, ("OS/2 server"));
 299                         ses->flags |= CIFS_SES_OS2;
 300         }
 301
 302         bcc_ptr += len + 1;
 303         bleft -= len + 1;
 304
 305         len = strnlen(bcc_ptr, bleft);
 306         if (len >= bleft)
 307                 return rc;
 308
 309         kfree(ses->serverNOS);
 310
 311         ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
 312         if (ses->serverNOS)
 313                 strncpy(ses->serverNOS, bcc_ptr, len);
 314
 315         bcc_ptr += len + 1;
 316         bleft -= len + 1;
 317
 318         len = strnlen(bcc_ptr, bleft);
 319         if (len > bleft)
 320                 return rc;
 321
 322         /* No domain field in LANMAN case. Domain is
 323            returned by old servers in the SMB negprot response */
 324         /* BB For newer servers which do not support Unicode,
 325            but thus do return domain here we could add parsing
 326            for it later, but it is not very important */
 327         cFYI(1, ("ascii: bytes left %d", bleft));
 328
 329         return rc;
 330 }
 331
 332 int
 333 CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 334                 const struct nls_table *nls_cp)
 335 {
 336         int rc = 0;
 337         int wct;
 338         struct smb_hdr *smb_buf;
 339         char *bcc_ptr;
 340         char *str_area;
 341         SESSION_SETUP_ANDX *pSMB;
 342         __u32 capabilities;
 343         int count;
 344         int resp_buf_type;
 345         struct kvec iov[3];
 346         enum securityEnum type;
 347         __u16 action;
 348         int bytes_remaining;
 349         struct key *spnego_key = NULL;
 350
 351         if (ses == NULL)
 352                 return -EINVAL;
 353
 354         type = ses->server->secType;
 355
 356         cFYI(1, ("sess setup type %d", type));
 357         if (type == LANMAN) {
 358 #ifndef CONFIG_CIFS_WEAK_PW_HASH
 359                 /* LANMAN and plaintext are less secure and off by default.
 360                 So we make this explicitly be turned on in kconfig (in the
 361                 build) and turned on at runtime (changed from the default)
 362                 in proc/fs/cifs or via mount parm.  Unfortunately this is
 363                 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
 364                 return -EOPNOTSUPP;
 365 #endif
 366                 wct = 10; /* lanman 2 style sessionsetup */
 367         } else if ((type == NTLM) || (type == NTLMv2)) {
 368                 /* For NTLMv2 failures eventually may need to retry NTLM */
 369                 wct = 13; /* old style NTLM sessionsetup */
 370         } else /* same size: negotiate or auth, NTLMSSP or extended security */
 371                 wct = 12;
 372
 373         rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
 374                             (void **)&smb_buf);
 375         if (rc)
 376                 return rc;
 377
 378         pSMB = (SESSION_SETUP_ANDX *)smb_buf;
 379
 380         capabilities = cifs_ssetup_hdr(ses, pSMB);
 381
 382         /* we will send the SMB in three pieces:
 383         a fixed length beginning part, an optional
 384         SPNEGO blob (which can be zero length), and a
 385         last part which will include the strings
 386         and rest of bcc area. This allows us to avoid
 387         a large buffer 17K allocation */
 388         iov[0].iov_base = (char *)pSMB;
 389         iov[0].iov_len = smb_buf->smb_buf_length + 4;
 390
 391         /* setting this here allows the code at the end of the function
 392            to free the request buffer if there's an error */
 393         resp_buf_type = CIFS_SMALL_BUFFER;
 394
 395         /* 2000 big enough to fit max user, domain, NOS name etc. */
 396         str_area = kmalloc(2000, GFP_KERNEL);
 397         if (str_area == NULL) {
 398                 rc = -ENOMEM;
 399                 goto ssetup_exit;
 400         }
 401         bcc_ptr = str_area;
 402
 403         ses->flags &= ~CIFS_SES_LANMAN;
 404
 405         iov[1].iov_base = NULL;
 406         iov[1].iov_len = 0;
 407
 408         if (type == LANMAN) {
 409 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 410                 char lnm_session_key[CIFS_SESS_KEY_SIZE];
 411
 412                 /* no capabilities flags in old lanman negotiation */
 413
 414                 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
 415                 /* BB calculate hash with password */
 416                 /* and copy into bcc */
 417
 418                 calc_lanman_hash(ses, lnm_session_key);
 419                 ses->flags |= CIFS_SES_LANMAN;
 420 <<<<<<< HEAD:fs/cifs/sess.c
 421 /* #ifdef CONFIG_CIFS_DEBUG2
 422                 cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
 423                         CIFS_SESS_KEY_SIZE);
 424 #endif */
 425 =======
 426 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/cifs/sess.c
 427                 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
 428                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 429
 430                 /* can not sign if LANMAN negotiated so no need
 431                 to calculate signing key? but what if server
 432                 changed to do higher than lanman dialect and
 433                 we reconnected would we ever calc signing_key? */
 434
 435                 cFYI(1, ("Negotiating LANMAN setting up strings"));
 436                 /* Unicode not allowed for LANMAN dialects */
 437                 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 438 #endif
 439         } else if (type == NTLM) {
 440                 char ntlm_session_key[CIFS_SESS_KEY_SIZE];
 441
 442                 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
 443                 pSMB->req_no_secext.CaseInsensitivePasswordLength =
 444                         cpu_to_le16(CIFS_SESS_KEY_SIZE);
 445                 pSMB->req_no_secext.CaseSensitivePasswordLength =
 446                         cpu_to_le16(CIFS_SESS_KEY_SIZE);
 447
 448                 /* calculate session key */
 449                 SMBNTencrypt(ses->password, ses->server->cryptKey,
 450                              ntlm_session_key);
 451
 452                 if (first_time) /* should this be moved into common code
 453                                   with similar ntlmv2 path? */
 454                         cifs_calculate_mac_key(&ses->server->mac_signing_key,
 455                                 ntlm_session_key, ses->password);
 456                 /* copy session key */
 457
 458                 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
 459                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 460                 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
 461                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 462                 if (ses->capabilities & CAP_UNICODE) {
 463                         /* unicode strings must be word aligned */
 464                         if (iov[0].iov_len % 2) {
 465                                 *bcc_ptr = 0;
 466                                 bcc_ptr++;
 467                         }
 468                         unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 469                 } else
 470                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 471         } else if (type == NTLMv2) {
 472                 char *v2_sess_key =
 473                         kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL);
 474
 475                 /* BB FIXME change all users of v2_sess_key to
 476                    struct ntlmv2_resp */
 477
 478                 if (v2_sess_key == NULL) {
 479                         rc = -ENOMEM;
 480                         goto ssetup_exit;
 481                 }
 482
 483                 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
 484
 485                 /* LM2 password would be here if we supported it */
 486                 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
 487                 /*      cpu_to_le16(LM2_SESS_KEY_SIZE); */
 488
 489                 pSMB->req_no_secext.CaseSensitivePasswordLength =
 490                         cpu_to_le16(sizeof(struct ntlmv2_resp));
 491
 492                 /* calculate session key */
 493                 setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
 494                 if (first_time) /* should this be moved into common code
 495                                    with similar ntlmv2 path? */
 496                 /*   cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key,
 497                                 response BB FIXME, v2_sess_key); */
 498
 499                 /* copy session key */
 500
 501         /*      memcpy(bcc_ptr, (char *)ntlm_session_key,LM2_SESS_KEY_SIZE);
 502                 bcc_ptr += LM2_SESS_KEY_SIZE; */
 503                 memcpy(bcc_ptr, (char *)v2_sess_key,
 504                        sizeof(struct ntlmv2_resp));
 505                 bcc_ptr += sizeof(struct ntlmv2_resp);
 506                 kfree(v2_sess_key);
 507                 if (ses->capabilities & CAP_UNICODE) {
 508                         if (iov[0].iov_len % 2) {
 509                                 *bcc_ptr = 0;
 510                                 bcc_ptr++;
 511                         }
 512                         unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 513                 } else
 514                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 515         } else if (type == Kerberos) {
 516 #ifdef CONFIG_CIFS_UPCALL
 517                 struct cifs_spnego_msg *msg;
 518                 spnego_key = cifs_get_spnego_key(ses);
 519                 if (IS_ERR(spnego_key)) {
 520                         rc = PTR_ERR(spnego_key);
 521                         spnego_key = NULL;
 522                         goto ssetup_exit;
 523                 }
 524
 525                 msg = spnego_key->payload.data;
 526                 /* bail out if key is too long */
 527                 if (msg->sesskey_len >
 528                     sizeof(ses->server->mac_signing_key.data.krb5)) {
 529                         cERROR(1, ("Kerberos signing key too long (%u bytes)",
 530                                 msg->sesskey_len));
 531                         rc = -EOVERFLOW;
 532                         goto ssetup_exit;
 533                 }
 534                 if (first_time) {
 535                         ses->server->mac_signing_key.len = msg->sesskey_len;
 536                         memcpy(ses->server->mac_signing_key.data.krb5,
 537                                 msg->data, msg->sesskey_len);
 538                 }
 539                 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
 540                 capabilities |= CAP_EXTENDED_SECURITY;
 541                 pSMB->req.Capabilities = cpu_to_le32(capabilities);
 542                 iov[1].iov_base = msg->data + msg->sesskey_len;
 543                 iov[1].iov_len = msg->secblob_len;
 544                 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
 545
 546                 if (ses->capabilities & CAP_UNICODE) {
 547                         /* unicode strings must be word aligned */
 548                         if ((iov[0].iov_len + iov[1].iov_len) % 2) {
 549                                 *bcc_ptr = 0;
 550                                 bcc_ptr++;
 551                         }
 552                         unicode_oslm_strings(&bcc_ptr, nls_cp);
 553                         unicode_domain_string(&bcc_ptr, ses, nls_cp);
 554                 } else
 555                 /* BB: is this right? */
 556                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 557 #else /* ! CONFIG_CIFS_UPCALL */
 558                 cERROR(1, ("Kerberos negotiated but upcall support disabled!"));
 559                 rc = -ENOSYS;
 560                 goto ssetup_exit;
 561 #endif /* CONFIG_CIFS_UPCALL */
 562         } else {
 563                 cERROR(1, ("secType %d not supported!", type));
 564                 rc = -ENOSYS;
 565                 goto ssetup_exit;
 566         }
 567
 568         iov[2].iov_base = str_area;
 569         iov[2].iov_len = (long) bcc_ptr - (long) str_area;
 570
 571         count = iov[1].iov_len + iov[2].iov_len;
 572         smb_buf->smb_buf_length += count;
 573
 574         BCC_LE(smb_buf) = cpu_to_le16(count);
 575
 576         rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
 577                           CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR);
 578         /* SMB request buf freed in SendReceive2 */
 579
 580         cFYI(1, ("ssetup rc from sendrecv2 is %d", rc));
 581         if (rc)
 582                 goto ssetup_exit;
 583
 584         pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
 585         smb_buf = (struct smb_hdr *)iov[0].iov_base;
 586
 587         if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
 588                 rc = -EIO;
 589                 cERROR(1, ("bad word count %d", smb_buf->WordCount));
 590                 goto ssetup_exit;
 591         }
 592         action = le16_to_cpu(pSMB->resp.Action);
 593         if (action & GUEST_LOGIN)
 594                 cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */
 595         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
 596         cFYI(1, ("UID = %d ", ses->Suid));
 597         /* response can have either 3 or 4 word count - Samba sends 3 */
 598         /* and lanman response is 3 */
 599         bytes_remaining = BCC(smb_buf);
 600         bcc_ptr = pByteArea(smb_buf);
 601
 602         if (smb_buf->WordCount == 4) {
 603                 __u16 blob_len;
 604                 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
 605                 bcc_ptr += blob_len;
 606                 if (blob_len > bytes_remaining) {
 607                         cERROR(1, ("bad security blob length %d", blob_len));
 608                         rc = -EINVAL;
 609                         goto ssetup_exit;
 610                 }
 611                 bytes_remaining -= blob_len;
 612         }
 613
 614         /* BB check if Unicode and decode strings */
 615         if (smb_buf->Flags2 & SMBFLG2_UNICODE)
 616                 rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
 617                                                    ses, nls_cp);
 618         else
 619                 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
 620                                          ses, nls_cp);
 621
 622 ssetup_exit:
 623         if (spnego_key)
 624                 key_put(spnego_key);
 625         kfree(str_area);
 626         if (resp_buf_type == CIFS_SMALL_BUFFER) {
 627                 cFYI(1, ("ssetup freeing small buf %p", iov[0].iov_base));
 628                 cifs_small_buf_release(iov[0].iov_base);
 629         } else if (resp_buf_type == CIFS_LARGE_BUFFER)
 630                 cifs_buf_release(iov[0].iov_base);
 631
 632         return rc;
 633 }