release/src-rt-6.x/linux/linux-2.6/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         cFYI(1, ("bleft %d", bleft));
 206
 207         /*
 208          * Windows servers do not always double null terminate their final
 209          * Unicode string. Check to see if there are an uneven number of bytes
 210          * left. If so, then add an extra NULL pad byte to the end of the
 211          * response.
 212          *
 213          * See section 2.7.2 in "Implementing CIFS" for details
 214          */
 215         if (bleft % 2) {
 216                 data[bleft] = 0;
 217                 ++bleft;
 218         }
 219
 220         words_left = bleft / 2;
 221
 222         /* save off server operating system */
 223         len = UniStrnlen((wchar_t *) data, words_left);
 224
 225         if (len >= words_left)
 226                 return rc;
 227
 228         kfree(ses->serverOS);
 229         /* UTF-8 string will not grow more than four times as big as UCS-16 */
 230         ses->serverOS = kzalloc(4 * len, GFP_KERNEL);
 231         if (ses->serverOS != NULL)
 232                 cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len, nls_cp);
 233         data += 2 * (len + 1);
 234         words_left -= len + 1;
 235
 236         /* save off server network operating system */
 237         len = UniStrnlen((wchar_t *) data, words_left);
 238
 239         if (len >= words_left)
 240                 return rc;
 241
 242         kfree(ses->serverNOS);
 243         ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */
 244         if (ses->serverNOS != NULL) {
 245                 cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
 246                                    nls_cp);
 247                 if (strncmp(ses->serverNOS, "NT LAN Manager 4", 16) == 0) {
 248                         cFYI(1, ("NT4 server"));
 249                         ses->flags |= CIFS_SES_NT4;
 250                 }
 251         }
 252         data += 2 * (len + 1);
 253         words_left -= len + 1;
 254
 255         /* save off server domain */
 256         len = UniStrnlen((wchar_t *) data, words_left);
 257
 258         if (len > words_left)
 259                 return rc;
 260
 261         kfree(ses->serverDomain);
 262         ses->serverDomain = kzalloc((4 * len) + 2, GFP_KERNEL);
 263         if (ses->serverDomain != NULL)
 264                 cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len,
 265                                    nls_cp);
 266         data += 2 * (len + 1);
 267         words_left -= len + 1;
 268
 269         cFYI(1, ("words left: %d", words_left));
 270
 271         return rc;
 272 }
 273
 274 static int decode_ascii_ssetup(char **pbcc_area, int bleft,
 275                                struct cifsSesInfo *ses,
 276                                const struct nls_table *nls_cp)
 277 {
 278         int rc = 0;
 279         int len;
 280         char *bcc_ptr = *pbcc_area;
 281
 282         cFYI(1, ("decode sessetup ascii. bleft %d", bleft));
 283
 284         len = strnlen(bcc_ptr, bleft);
 285         if (len >= bleft)
 286                 return rc;
 287
 288         kfree(ses->serverOS);
 289
 290         ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
 291         if (ses->serverOS)
 292                 strncpy(ses->serverOS, bcc_ptr, len);
 293         if (strncmp(ses->serverOS, "OS/2", 4) == 0) {
 294                         cFYI(1, ("OS/2 server"));
 295                         ses->flags |= CIFS_SES_OS2;
 296         }
 297
 298         bcc_ptr += len + 1;
 299         bleft -= len + 1;
 300
 301         len = strnlen(bcc_ptr, bleft);
 302         if (len >= bleft)
 303                 return rc;
 304
 305         kfree(ses->serverNOS);
 306
 307         ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
 308         if (ses->serverNOS)
 309                 strncpy(ses->serverNOS, bcc_ptr, len);
 310
 311         bcc_ptr += len + 1;
 312         bleft -= len + 1;
 313
 314         len = strnlen(bcc_ptr, bleft);
 315         if (len > bleft)
 316                 return rc;
 317
 318         /* No domain field in LANMAN case. Domain is
 319            returned by old servers in the SMB negprot response */
 320         /* BB For newer servers which do not support Unicode,
 321            but thus do return domain here we could add parsing
 322            for it later, but it is not very important */
 323         cFYI(1, ("ascii: bytes left %d", bleft));
 324
 325         return rc;
 326 }
 327
 328 int
 329 CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 330                 const struct nls_table *nls_cp)
 331 {
 332         int rc = 0;
 333         int wct;
 334         struct smb_hdr *smb_buf;
 335         char *bcc_ptr;
 336         char *str_area;
 337         SESSION_SETUP_ANDX *pSMB;
 338         __u32 capabilities;
 339         int count;
 340         int resp_buf_type;
 341         struct kvec iov[3];
 342         enum securityEnum type;
 343         __u16 action;
 344         int bytes_remaining;
 345         struct key *spnego_key = NULL;
 346
 347         if (ses == NULL)
 348                 return -EINVAL;
 349
 350         type = ses->server->secType;
 351
 352         cFYI(1, ("sess setup type %d", type));
 353         if (type == LANMAN) {
 354 #ifndef CONFIG_CIFS_WEAK_PW_HASH
 355                 /* LANMAN and plaintext are less secure and off by default.
 356                 So we make this explicitly be turned on in kconfig (in the
 357                 build) and turned on at runtime (changed from the default)
 358                 in proc/fs/cifs or via mount parm.  Unfortunately this is
 359                 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
 360                 return -EOPNOTSUPP;
 361 #endif
 362                 wct = 10; /* lanman 2 style sessionsetup */
 363         } else if ((type == NTLM) || (type == NTLMv2)) {
 364                 /* For NTLMv2 failures eventually may need to retry NTLM */
 365                 wct = 13; /* old style NTLM sessionsetup */
 366         } else /* same size: negotiate or auth, NTLMSSP or extended security */
 367                 wct = 12;
 368
 369         rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
 370                             (void **)&smb_buf);
 371         if (rc)
 372                 return rc;
 373
 374         pSMB = (SESSION_SETUP_ANDX *)smb_buf;
 375
 376         capabilities = cifs_ssetup_hdr(ses, pSMB);
 377
 378         /* we will send the SMB in three pieces:
 379         a fixed length beginning part, an optional
 380         SPNEGO blob (which can be zero length), and a
 381         last part which will include the strings
 382         and rest of bcc area. This allows us to avoid
 383         a large buffer 17K allocation */
 384         iov[0].iov_base = (char *)pSMB;
 385         iov[0].iov_len = smb_buf->smb_buf_length + 4;
 386
 387         /* setting this here allows the code at the end of the function
 388            to free the request buffer if there's an error */
 389         resp_buf_type = CIFS_SMALL_BUFFER;
 390
 391         /* 2000 big enough to fit max user, domain, NOS name etc. */
 392         str_area = kmalloc(2000, GFP_KERNEL);
 393         if (str_area == NULL) {
 394                 rc = -ENOMEM;
 395                 goto ssetup_exit;
 396         }
 397         bcc_ptr = str_area;
 398
 399         ses->flags &= ~CIFS_SES_LANMAN;
 400
 401         iov[1].iov_base = NULL;
 402         iov[1].iov_len = 0;
 403
 404         if (type == LANMAN) {
 405 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 406                 char lnm_session_key[CIFS_SESS_KEY_SIZE];
 407
 408                 /* no capabilities flags in old lanman negotiation */
 409
 410                 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
 411                 /* BB calculate hash with password */
 412                 /* and copy into bcc */
 413
 414                 calc_lanman_hash(ses, lnm_session_key);
 415                 ses->flags |= CIFS_SES_LANMAN;
 416 /* #ifdef CONFIG_CIFS_DEBUG2
 417                 cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
 418                         CIFS_SESS_KEY_SIZE);
 419 #endif */
 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                 ses->server->mac_signing_key.len = msg->sesskey_len;
 528                 memcpy(ses->server->mac_signing_key.data.krb5, msg->data,
 529                         msg->sesskey_len);
 530                 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
 531                 capabilities |= CAP_EXTENDED_SECURITY;
 532                 pSMB->req.Capabilities = cpu_to_le32(capabilities);
 533                 iov[1].iov_base = msg->data + msg->sesskey_len;
 534                 iov[1].iov_len = msg->secblob_len;
 535                 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
 536
 537                 if (ses->capabilities & CAP_UNICODE) {
 538                         /* unicode strings must be word aligned */
 539                         if (iov[0].iov_len % 2) {
 540                                 *bcc_ptr = 0;
 541                                 bcc_ptr++;
 542                         }
 543                         unicode_oslm_strings(&bcc_ptr, nls_cp);
 544                         unicode_domain_string(&bcc_ptr, ses, nls_cp);
 545                 } else
 546                 /* BB: is this right? */
 547                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 548 #else /* ! CONFIG_CIFS_UPCALL */
 549                 cERROR(1, ("Kerberos negotiated but upcall support disabled!"));
 550                 rc = -ENOSYS;
 551                 goto ssetup_exit;
 552 #endif /* CONFIG_CIFS_UPCALL */
 553         } else {
 554                 cERROR(1, ("secType %d not supported!", type));
 555                 rc = -ENOSYS;
 556                 goto ssetup_exit;
 557         }
 558
 559         iov[2].iov_base = str_area;
 560         iov[2].iov_len = (long) bcc_ptr - (long) str_area;
 561
 562         count = iov[1].iov_len + iov[2].iov_len;
 563         smb_buf->smb_buf_length += count;
 564
 565         BCC_LE(smb_buf) = cpu_to_le16(count);
 566
 567         rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
 568                           CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR);
 569         /* SMB request buf freed in SendReceive2 */
 570
 571         cFYI(1, ("ssetup rc from sendrecv2 is %d", rc));
 572         if (rc)
 573                 goto ssetup_exit;
 574
 575         pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
 576         smb_buf = (struct smb_hdr *)iov[0].iov_base;
 577
 578         if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
 579                 rc = -EIO;
 580                 cERROR(1, ("bad word count %d", smb_buf->WordCount));
 581                 goto ssetup_exit;
 582         }
 583         action = le16_to_cpu(pSMB->resp.Action);
 584         if (action & GUEST_LOGIN)
 585                 cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */
 586         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
 587         cFYI(1, ("UID = %d ", ses->Suid));
 588         /* response can have either 3 or 4 word count - Samba sends 3 */
 589         /* and lanman response is 3 */
 590         bytes_remaining = BCC(smb_buf);
 591         bcc_ptr = pByteArea(smb_buf);
 592
 593         if (smb_buf->WordCount == 4) {
 594                 __u16 blob_len;
 595                 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
 596                 bcc_ptr += blob_len;
 597                 if (blob_len > bytes_remaining) {
 598                         cERROR(1, ("bad security blob length %d", blob_len));
 599                         rc = -EINVAL;
 600                         goto ssetup_exit;
 601                 }
 602                 bytes_remaining -= blob_len;
 603         }
 604
 605         /* BB check if Unicode and decode strings */
 606         if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
 607                 /* unicode string area must be word-aligned */
 608                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
 609                         ++bcc_ptr;
 610                         --bytes_remaining;
 611                 }
 612                 rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
 613                                            ses, nls_cp);
 614         } else {
 615                 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
 616                                          ses, nls_cp);
 617         }
 618
 619 ssetup_exit:
 620         if (spnego_key)
 621                 key_put(spnego_key);
 622         kfree(str_area);
 623         if (resp_buf_type == CIFS_SMALL_BUFFER) {
 624                 cFYI(1, ("ssetup freeing small buf %p", iov[0].iov_base));
 625                 cifs_small_buf_release(iov[0].iov_base);
 626         } else if (resp_buf_type == CIFS_LARGE_BUFFER)
 627                 cifs_buf_release(iov[0].iov_base);
 628
 629         return rc;
 630 }