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) + 2 /* trailing null */, 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) + 2 /* trailing null */, GFP_KERNEL);
 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                 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
 409
 410                 /* no capabilities flags in old lanman negotiation */
 411
 412                 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
 413                 /* BB calculate hash with password */
 414                 /* and copy into bcc */
 415
 416                 calc_lanman_hash(ses, lnm_session_key);
 417                 ses->flags |= CIFS_SES_LANMAN;
 418                 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
 419                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 420
 421                 /* can not sign if LANMAN negotiated so no need
 422                 to calculate signing key? but what if server
 423                 changed to do higher than lanman dialect and
 424                 we reconnected would we ever calc signing_key? */
 425
 426                 cFYI(1, ("Negotiating LANMAN setting up strings"));
 427                 /* Unicode not allowed for LANMAN dialects */
 428                 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 429 #endif
 430         } else if (type == NTLM) {
 431                 char ntlm_session_key[CIFS_SESS_KEY_SIZE];
 432
 433                 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
 434                 pSMB->req_no_secext.CaseInsensitivePasswordLength =
 435                         cpu_to_le16(CIFS_SESS_KEY_SIZE);
 436                 pSMB->req_no_secext.CaseSensitivePasswordLength =
 437                         cpu_to_le16(CIFS_SESS_KEY_SIZE);
 438
 439                 /* calculate session key */
 440                 SMBNTencrypt(ses->password, ses->server->cryptKey,
 441                              ntlm_session_key);
 442
 443                 if (first_time) /* should this be moved into common code
 444                                   with similar ntlmv2 path? */
 445                         cifs_calculate_mac_key(&ses->server->mac_signing_key,
 446                                 ntlm_session_key, ses->password);
 447                 /* copy session key */
 448
 449                 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
 450                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 451                 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
 452                 bcc_ptr += CIFS_SESS_KEY_SIZE;
 453                 if (ses->capabilities & CAP_UNICODE) {
 454                         /* unicode strings must be word aligned */
 455                         if (iov[0].iov_len % 2) {
 456                                 *bcc_ptr = 0;
 457                                 bcc_ptr++;
 458                         }
 459                         unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 460                 } else
 461                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 462         } else if (type == NTLMv2) {
 463                 char *v2_sess_key =
 464                         kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL);
 465
 466                 /* BB FIXME change all users of v2_sess_key to
 467                    struct ntlmv2_resp */
 468
 469                 if (v2_sess_key == NULL) {
 470                         rc = -ENOMEM;
 471                         goto ssetup_exit;
 472                 }
 473
 474                 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
 475
 476                 /* LM2 password would be here if we supported it */
 477                 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
 478                 /*      cpu_to_le16(LM2_SESS_KEY_SIZE); */
 479
 480                 pSMB->req_no_secext.CaseSensitivePasswordLength =
 481                         cpu_to_le16(sizeof(struct ntlmv2_resp));
 482
 483                 /* calculate session key */
 484                 setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
 485                 /* FIXME: calculate MAC key */
 486                 memcpy(bcc_ptr, (char *)v2_sess_key,
 487                        sizeof(struct ntlmv2_resp));
 488                 bcc_ptr += sizeof(struct ntlmv2_resp);
 489                 kfree(v2_sess_key);
 490                 if (ses->capabilities & CAP_UNICODE) {
 491                         if (iov[0].iov_len % 2) {
 492                                 *bcc_ptr = 0;
 493                                 bcc_ptr++;
 494                         }
 495                         unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 496                 } else
 497                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 498         } else if (type == Kerberos || type == MSKerberos) {
 499 #ifdef CONFIG_CIFS_UPCALL
 500                 struct cifs_spnego_msg *msg;
 501                 spnego_key = cifs_get_spnego_key(ses);
 502                 if (IS_ERR(spnego_key)) {
 503                         rc = PTR_ERR(spnego_key);
 504                         spnego_key = NULL;
 505                         goto ssetup_exit;
 506                 }
 507
 508                 msg = spnego_key->payload.data;
 509                 /* check version field to make sure that cifs.upcall is
 510                    sending us a response in an expected form */
 511                 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 512                         cERROR(1, ("incorrect version of cifs.upcall (expected"
 513                                    " %d but got %d)",
 514                                    CIFS_SPNEGO_UPCALL_VERSION, msg->version));
 515                         rc = -EKEYREJECTED;
 516                         goto ssetup_exit;
 517                 }
 518                 /* bail out if key is too long */
 519                 if (msg->sesskey_len >
 520                     sizeof(ses->server->mac_signing_key.data.krb5)) {
 521                         cERROR(1, ("Kerberos signing key too long (%u bytes)",
 522                                 msg->sesskey_len));
 523                         rc = -EOVERFLOW;
 524                         goto ssetup_exit;
 525                 }
 526                 if (first_time) {
 527                         ses->server->mac_signing_key.len = msg->sesskey_len;
 528                         memcpy(ses->server->mac_signing_key.data.krb5,
 529                                 msg->data, msg->sesskey_len);
 530                 }
 531                 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
 532                 capabilities |= CAP_EXTENDED_SECURITY;
 533                 pSMB->req.Capabilities = cpu_to_le32(capabilities);
 534                 iov[1].iov_base = msg->data + msg->sesskey_len;
 535                 iov[1].iov_len = msg->secblob_len;
 536                 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
 537
 538                 if (ses->capabilities & CAP_UNICODE) {
 539                         /* unicode strings must be word aligned */
 540                         if ((iov[0].iov_len + iov[1].iov_len) % 2) {
 541                                 *bcc_ptr = 0;
 542                                 bcc_ptr++;
 543                         }
 544                         unicode_oslm_strings(&bcc_ptr, nls_cp);
 545                         unicode_domain_string(&bcc_ptr, ses, nls_cp);
 546                 } else
 547                 /* BB: is this right? */
 548                         ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
 549 #else /* ! CONFIG_CIFS_UPCALL */
 550                 cERROR(1, ("Kerberos negotiated but upcall support disabled!"));
 551                 rc = -ENOSYS;
 552                 goto ssetup_exit;
 553 #endif /* CONFIG_CIFS_UPCALL */
 554         } else {
 555                 cERROR(1, ("secType %d not supported!", type));
 556                 rc = -ENOSYS;
 557                 goto ssetup_exit;
 558         }
 559
 560         iov[2].iov_base = str_area;
 561         iov[2].iov_len = (long) bcc_ptr - (long) str_area;
 562
 563         count = iov[1].iov_len + iov[2].iov_len;
 564         smb_buf->smb_buf_length += count;
 565
 566         BCC_LE(smb_buf) = cpu_to_le16(count);
 567
 568         rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
 569                           CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR);
 570         /* SMB request buf freed in SendReceive2 */
 571
 572         cFYI(1, ("ssetup rc from sendrecv2 is %d", rc));
 573         if (rc)
 574                 goto ssetup_exit;
 575
 576         pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
 577         smb_buf = (struct smb_hdr *)iov[0].iov_base;
 578
 579         if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
 580                 rc = -EIO;
 581                 cERROR(1, ("bad word count %d", smb_buf->WordCount));
 582                 goto ssetup_exit;
 583         }
 584         action = le16_to_cpu(pSMB->resp.Action);
 585         if (action & GUEST_LOGIN)
 586                 cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */
 587         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
 588         cFYI(1, ("UID = %d ", ses->Suid));
 589         /* response can have either 3 or 4 word count - Samba sends 3 */
 590         /* and lanman response is 3 */
 591         bytes_remaining = BCC(smb_buf);
 592         bcc_ptr = pByteArea(smb_buf);
 593
 594         if (smb_buf->WordCount == 4) {
 595                 __u16 blob_len;
 596                 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
 597                 bcc_ptr += blob_len;
 598                 if (blob_len > bytes_remaining) {
 599                         cERROR(1, ("bad security blob length %d", blob_len));
 600                         rc = -EINVAL;
 601                         goto ssetup_exit;
 602                 }
 603                 bytes_remaining -= blob_len;
 604         }
 605
 606         /* BB check if Unicode and decode strings */
 607         if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
 608                 /* unicode string area must be word-aligned */
 609                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
 610                         ++bcc_ptr;
 611                         --bytes_remaining;
 612                 }
 613                 rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
 614                                            ses, nls_cp);
 615         } else {
 616                 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
 617                                          ses, nls_cp);
 618         }
 619
 620 ssetup_exit:
 621         if (spnego_key)
 622                 key_put(spnego_key);
 623         kfree(str_area);
 624         if (resp_buf_type == CIFS_SMALL_BUFFER) {
 625                 cFYI(1, ("ssetup freeing small buf %p", iov[0].iov_base));
 626                 cifs_small_buf_release(iov[0].iov_base);
 627         } else if (resp_buf_type == CIFS_LARGE_BUFFER)
 628                 cifs_buf_release(iov[0].iov_base);
 629
 630         return rc;
 631 }