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                 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
 421                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 422
 423                 /* can not sign if LANMAN negotiated so no need
 424                 to calculate signing key? but what if server
 425                 changed to do higher than lanman dialect and
 426                 we reconnected would we ever calc signing_key? */
 427
 428                 cFYI(1, ("Negotiating LANMAN setting up strings"));
 429                 /* Unicode not allowed for LANMAN dialects */
 430                 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 431 #endif
 432         } else if (type == NTLM) {
 433                 char ntlm_session_key[CIFS_SESS_KEY_SIZE];
 434
 435                 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
 436                 pSMB->req_no_secext.CaseInsensitivePasswordLength =
 437                         cpu_to_le16(CIFS_SESS_KEY_SIZE);
 438                 pSMB->req_no_secext.CaseSensitivePasswordLength =
 439                         cpu_to_le16(CIFS_SESS_KEY_SIZE);
 440
 441                 /* calculate session key */
 442                 SMBNTencrypt(ses->password, ses->server->cryptKey,
 443                              ntlm_session_key);
 444
 445                 if (first_time) /* should this be moved into common code
 446                                   with similar ntlmv2 path? */
 447                         cifs_calculate_mac_key(&ses->server->mac_signing_key,
 448                                 ntlm_session_key, ses->password);
 449                 /* copy session key */
 450
 451                 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
 452                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 453                 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
 454                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 455                 if (ses->capabilities & CAP_UNICODE) {
 456                         /* unicode strings must be word aligned */
 457                         if (iov[0].iov_len % 2) {
 458                                 *bcc_ptr = 0;
 459                                 bcc_ptr++;
 460                         }
 461                         unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 462                 } else
 463                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 464         } else if (type == NTLMv2) {
 465                 char *v2_sess_key =
 466                         kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL);
 467
 468                 /* BB FIXME change all users of v2_sess_key to
 469                    struct ntlmv2_resp */
 470
 471                 if (v2_sess_key == NULL) {
 472                         rc = -ENOMEM;
 473                         goto ssetup_exit;
 474                 }
 475
 476                 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
 477
 478                 /* LM2 password would be here if we supported it */
 479                 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
 480                 /*      cpu_to_le16(LM2_SESS_KEY_SIZE); */
 481
 482                 pSMB->req_no_secext.CaseSensitivePasswordLength =
 483                         cpu_to_le16(sizeof(struct ntlmv2_resp));
 484
 485                 /* calculate session key */
 486                 setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
 487                 if (first_time) /* should this be moved into common code
 488                                    with similar ntlmv2 path? */
 489                 /*   cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key,
 490                                 response BB FIXME, v2_sess_key); */
 491
 492                 /* copy session key */
 493
 494         /*      memcpy(bcc_ptr, (char *)ntlm_session_key,LM2_SESS_KEY_SIZE);
 495                 bcc_ptr += LM2_SESS_KEY_SIZE; */
 496                 memcpy(bcc_ptr, (char *)v2_sess_key,
 497                        sizeof(struct ntlmv2_resp));
 498                 bcc_ptr += sizeof(struct ntlmv2_resp);
 499                 kfree(v2_sess_key);
 500                 if (ses->capabilities & CAP_UNICODE) {
 501                         if (iov[0].iov_len % 2) {
 502                                 *bcc_ptr = 0;
 503                                 bcc_ptr++;
 504                         }
 505                         unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 506                 } else
 507                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 508         } else if (type == Kerberos) {
 509 #ifdef CONFIG_CIFS_UPCALL
 510                 struct cifs_spnego_msg *msg;
 511                 spnego_key = cifs_get_spnego_key(ses);
 512                 if (IS_ERR(spnego_key)) {
 513                         rc = PTR_ERR(spnego_key);
 514                         spnego_key = NULL;
 515                         goto ssetup_exit;
 516                 }
 517
 518                 msg = spnego_key->payload.data;
 519                 /* bail out if key is too long */
 520                 if (msg->sesskey_len >
 521                     sizeof(ses->server->mac_signing_key.data.krb5)) {
 522                         cERROR(1, ("Kerberos signing key too long (%u bytes)",
 523                                 msg->sesskey_len));
 524                         rc = -EOVERFLOW;
 525                         goto ssetup_exit;
 526                 }
 527                 if (first_time) {
 528                         ses->server->mac_signing_key.len = msg->sesskey_len;
 529                         memcpy(ses->server->mac_signing_key.data.krb5,
 530                                 msg->data, msg->sesskey_len);
 531                 }
 532                 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
 533                 capabilities |= CAP_EXTENDED_SECURITY;
 534                 pSMB->req.Capabilities = cpu_to_le32(capabilities);
 535                 iov[1].iov_base = msg->data + msg->sesskey_len;
 536                 iov[1].iov_len = msg->secblob_len;
 537                 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
 538
 539                 if (ses->capabilities & CAP_UNICODE) {
 540                         /* unicode strings must be word aligned */
 541                         if ((iov[0].iov_len + iov[1].iov_len) % 2) {
 542                                 *bcc_ptr = 0;
 543                                 bcc_ptr++;
 544                         }
 545                         unicode_oslm_strings(&bcc_ptr, nls_cp);
 546                         unicode_domain_string(&bcc_ptr, ses, nls_cp);
 547                 } else
 548                 /* BB: is this right? */
 549                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 550 #else /* ! CONFIG_CIFS_UPCALL */
 551                 cERROR(1, ("Kerberos negotiated but upcall support disabled!"));
 552                 rc = -ENOSYS;
 553                 goto ssetup_exit;
 554 #endif /* CONFIG_CIFS_UPCALL */
 555         } else {
 556                 cERROR(1, ("secType %d not supported!", type));
 557                 rc = -ENOSYS;
 558                 goto ssetup_exit;
 559         }
 560
 561         iov[2].iov_base = str_area;
 562         iov[2].iov_len = (long) bcc_ptr - (long) str_area;
 563
 564         count = iov[1].iov_len + iov[2].iov_len;
 565         smb_buf->smb_buf_length += count;
 566
 567         BCC_LE(smb_buf) = cpu_to_le16(count);
 568
 569         rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
 570                           CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR);
 571         /* SMB request buf freed in SendReceive2 */
 572
 573         cFYI(1, ("ssetup rc from sendrecv2 is %d", rc));
 574         if (rc)
 575                 goto ssetup_exit;
 576
 577         pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
 578         smb_buf = (struct smb_hdr *)iov[0].iov_base;
 579
 580         if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
 581                 rc = -EIO;
 582                 cERROR(1, ("bad word count %d", smb_buf->WordCount));
 583                 goto ssetup_exit;
 584         }
 585         action = le16_to_cpu(pSMB->resp.Action);
 586         if (action & GUEST_LOGIN)
 587                 cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */
 588         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
 589         cFYI(1, ("UID = %d ", ses->Suid));
 590         /* response can have either 3 or 4 word count - Samba sends 3 */
 591         /* and lanman response is 3 */
 592         bytes_remaining = BCC(smb_buf);
 593         bcc_ptr = pByteArea(smb_buf);
 594
 595         if (smb_buf->WordCount == 4) {
 596                 __u16 blob_len;
 597                 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
 598                 bcc_ptr += blob_len;
 599                 if (blob_len > bytes_remaining) {
 600                         cERROR(1, ("bad security blob length %d", blob_len));
 601                         rc = -EINVAL;
 602                         goto ssetup_exit;
 603                 }
 604                 bytes_remaining -= blob_len;
 605         }
 606
 607         /* BB check if Unicode and decode strings */
 608         if (smb_buf->Flags2 & SMBFLG2_UNICODE)
 609                 rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
 610                                                    ses, nls_cp);
 611         else
 612                 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
 613                                          ses, nls_cp);
 614
 615 ssetup_exit:
 616         if (spnego_key)
 617                 key_put(spnego_key);
 618         kfree(str_area);
 619         if (resp_buf_type == CIFS_SMALL_BUFFER) {
 620                 cFYI(1, ("ssetup freeing small buf %p", iov[0].iov_base));
 621                 cifs_small_buf_release(iov[0].iov_base);
 622         } else if (resp_buf_type == CIFS_LARGE_BUFFER)
 623                 cifs_buf_release(iov[0].iov_base);
 624
 625         return rc;
 626 }