fs/cifs/sess.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *
   4  *   SMB/CIFS session setup handling routines
   5  *
   6  *   Copyright (c) International Business Machines  Corp., 2006, 2009
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  */
  10
  11 #include "cifspdu.h"
  12 #include "cifsglob.h"
  13 #include "cifsproto.h"
  14 #include "cifs_unicode.h"
  15 #include "cifs_debug.h"
  16 #include "ntlmssp.h"
  17 #include "nterr.h"
  18 #include <linux/utsname.h>
  19 #include <linux/slab.h>
  20 #include <linux/version.h>
  21 #include "cifsfs.h"
  22 #include "cifs_spnego.h"
  23 #include "smb2proto.h"
  24 #include "fs_context.h"
  25
  26 static int
  27 cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
  28                      struct cifs_server_iface *iface);
  29
  30 bool
  31 is_server_using_iface(struct TCP_Server_Info *server,
  32                       struct cifs_server_iface *iface)
  33 {
  34         struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
  35         struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
  36         struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
  37         struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
  38
  39         if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
  40                 return false;
  41         if (server->dstaddr.ss_family == AF_INET) {
  42                 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
  43                         return false;
  44         } else if (server->dstaddr.ss_family == AF_INET6) {
  45                 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
  46                            sizeof(i6->sin6_addr)) != 0)
  47                         return false;
  48         } else {
  49                 /* unknown family.. */
  50                 return false;
  51         }
  52         return true;
  53 }
  54
  55 bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
  56 {
  57         int i;
  58
  59         spin_lock(&ses->chan_lock);
  60         for (i = 0; i < ses->chan_count; i++) {
  61                 if (ses->chans[i].iface == iface) {
  62                         spin_unlock(&ses->chan_lock);
  63                         return true;
  64                 }
  65         }
  66         spin_unlock(&ses->chan_lock);
  67         return false;
  68 }
  69
  70 /* channel helper functions. assumed that chan_lock is held by caller. */
  71
  72 unsigned int
  73 cifs_ses_get_chan_index(struct cifs_ses *ses,
  74                         struct TCP_Server_Info *server)
  75 {
  76         unsigned int i;
  77
  78         for (i = 0; i < ses->chan_count; i++) {
  79                 if (ses->chans[i].server == server)
  80                         return i;
  81         }
  82
  83         /* If we didn't find the channel, it is likely a bug */
  84         if (server)
  85                 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
  86                          server->conn_id);
  87         WARN_ON(1);
  88         return 0;
  89 }
  90
  91 void
  92 cifs_chan_set_in_reconnect(struct cifs_ses *ses,
  93                              struct TCP_Server_Info *server)
  94 {
  95         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
  96
  97         ses->chans[chan_index].in_reconnect = true;
  98 }
  99
 100 void
 101 cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
 102                              struct TCP_Server_Info *server)
 103 {
 104         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 105
 106         ses->chans[chan_index].in_reconnect = false;
 107 }
 108
 109 bool
 110 cifs_chan_in_reconnect(struct cifs_ses *ses,
 111                           struct TCP_Server_Info *server)
 112 {
 113         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 114
 115         return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
 116 }
 117
 118 void
 119 cifs_chan_set_need_reconnect(struct cifs_ses *ses,
 120                              struct TCP_Server_Info *server)
 121 {
 122         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 123
 124         set_bit(chan_index, &ses->chans_need_reconnect);
 125         cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
 126                  chan_index, ses->chans_need_reconnect);
 127 }
 128
 129 void
 130 cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
 131                                struct TCP_Server_Info *server)
 132 {
 133         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 134
 135         clear_bit(chan_index, &ses->chans_need_reconnect);
 136         cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
 137                  chan_index, ses->chans_need_reconnect);
 138 }
 139
 140 bool
 141 cifs_chan_needs_reconnect(struct cifs_ses *ses,
 142                           struct TCP_Server_Info *server)
 143 {
 144         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 145
 146         return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
 147 }
 148
 149 bool
 150 cifs_chan_is_iface_active(struct cifs_ses *ses,
 151                           struct TCP_Server_Info *server)
 152 {
 153         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 154
 155         return ses->chans[chan_index].iface &&
 156                 ses->chans[chan_index].iface->is_active;
 157 }
 158
 159 /* returns number of channels added */
 160 int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
 161 {
 162         int old_chan_count, new_chan_count;
 163         int left;
 164         int rc = 0;
 165         int tries = 0;
 166         struct cifs_server_iface *iface = NULL, *niface = NULL;
 167
 168         spin_lock(&ses->chan_lock);
 169
 170         new_chan_count = old_chan_count = ses->chan_count;
 171         left = ses->chan_max - ses->chan_count;
 172
 173         if (left <= 0) {
 174                 spin_unlock(&ses->chan_lock);
 175                 cifs_dbg(FYI,
 176                          "ses already at max_channels (%zu), nothing to open\n",
 177                          ses->chan_max);
 178                 return 0;
 179         }
 180
 181         if (ses->server->dialect < SMB30_PROT_ID) {
 182                 spin_unlock(&ses->chan_lock);
 183                 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
 184                 return 0;
 185         }
 186
 187         if (!(ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 188                 ses->chan_max = 1;
 189                 spin_unlock(&ses->chan_lock);
 190                 cifs_dbg(VFS, "server %s does not support multichannel\n", ses->server->hostname);
 191                 return 0;
 192         }
 193         spin_unlock(&ses->chan_lock);
 194
 195         /*
 196          * Keep connecting to same, fastest, iface for all channels as
 197          * long as its RSS. Try next fastest one if not RSS or channel
 198          * creation fails.
 199          */
 200         spin_lock(&ses->iface_lock);
 201         iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
 202                                  iface_head);
 203         spin_unlock(&ses->iface_lock);
 204
 205         while (left > 0) {
 206
 207                 tries++;
 208                 if (tries > 3*ses->chan_max) {
 209                         cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
 210                                  left);
 211                         break;
 212                 }
 213
 214                 spin_lock(&ses->iface_lock);
 215                 if (!ses->iface_count) {
 216                         spin_unlock(&ses->iface_lock);
 217                         break;
 218                 }
 219
 220                 list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
 221                                     iface_head) {
 222                         /* skip ifaces that are unusable */
 223                         if (!iface->is_active ||
 224                             (is_ses_using_iface(ses, iface) &&
 225                              !iface->rss_capable)) {
 226                                 continue;
 227                         }
 228
 229                         /* take ref before unlock */
 230                         kref_get(&iface->refcount);
 231
 232                         spin_unlock(&ses->iface_lock);
 233                         rc = cifs_ses_add_channel(cifs_sb, ses, iface);
 234                         spin_lock(&ses->iface_lock);
 235
 236                         if (rc) {
 237                                 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
 238                                          &iface->sockaddr,
 239                                          rc);
 240                                 kref_put(&iface->refcount, release_iface);
 241                                 continue;
 242                         }
 243
 244                         cifs_dbg(FYI, "successfully opened new channel on iface:%pIS\n",
 245                                  &iface->sockaddr);
 246                         break;
 247                 }
 248                 spin_unlock(&ses->iface_lock);
 249
 250                 left--;
 251                 new_chan_count++;
 252         }
 253
 254         return new_chan_count - old_chan_count;
 255 }
 256
 257 /*
 258  * update the iface for the channel if necessary.
 259  * will return 0 when iface is updated, 1 if removed, 2 otherwise
 260  * Must be called with chan_lock held.
 261  */
 262 int
 263 cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
 264 {
 265         unsigned int chan_index;
 266         struct cifs_server_iface *iface = NULL;
 267         struct cifs_server_iface *old_iface = NULL;
 268         int rc = 0;
 269
 270         spin_lock(&ses->chan_lock);
 271         chan_index = cifs_ses_get_chan_index(ses, server);
 272         if (!chan_index) {
 273                 spin_unlock(&ses->chan_lock);
 274                 return 0;
 275         }
 276
 277         if (ses->chans[chan_index].iface) {
 278                 old_iface = ses->chans[chan_index].iface;
 279                 if (old_iface->is_active) {
 280                         spin_unlock(&ses->chan_lock);
 281                         return 1;
 282                 }
 283         }
 284         spin_unlock(&ses->chan_lock);
 285
 286         spin_lock(&ses->iface_lock);
 287         /* then look for a new one */
 288         list_for_each_entry(iface, &ses->iface_list, iface_head) {
 289                 if (!iface->is_active ||
 290                     (is_ses_using_iface(ses, iface) &&
 291                      !iface->rss_capable)) {
 292                         continue;
 293                 }
 294                 kref_get(&iface->refcount);
 295         }
 296
 297         if (!list_entry_is_head(iface, &ses->iface_list, iface_head)) {
 298                 rc = 1;
 299                 iface = NULL;
 300                 cifs_dbg(FYI, "unable to find a suitable iface\n");
 301         }
 302
 303         /* now drop the ref to the current iface */
 304         if (old_iface && iface) {
 305                 kref_put(&old_iface->refcount, release_iface);
 306                 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
 307                          &old_iface->sockaddr,
 308                          &iface->sockaddr);
 309         } else if (old_iface) {
 310                 kref_put(&old_iface->refcount, release_iface);
 311                 cifs_dbg(FYI, "releasing ref to iface: %pIS\n",
 312                          &old_iface->sockaddr);
 313         } else {
 314                 WARN_ON(!iface);
 315                 cifs_dbg(FYI, "adding new iface: %pIS\n", &iface->sockaddr);
 316         }
 317         spin_unlock(&ses->iface_lock);
 318
 319         spin_lock(&ses->chan_lock);
 320         chan_index = cifs_ses_get_chan_index(ses, server);
 321         ses->chans[chan_index].iface = iface;
 322
 323         /* No iface is found. if secondary chan, drop connection */
 324         if (!iface && CIFS_SERVER_IS_CHAN(server))
 325                 ses->chans[chan_index].server = NULL;
 326
 327         spin_unlock(&ses->chan_lock);
 328
 329         if (!iface && CIFS_SERVER_IS_CHAN(server))
 330                 cifs_put_tcp_session(server, false);
 331
 332         return rc;
 333 }
 334
 335 /*
 336  * If server is a channel of ses, return the corresponding enclosing
 337  * cifs_chan otherwise return NULL.
 338  */
 339 struct cifs_chan *
 340 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
 341 {
 342         int i;
 343
 344         spin_lock(&ses->chan_lock);
 345         for (i = 0; i < ses->chan_count; i++) {
 346                 if (ses->chans[i].server == server) {
 347                         spin_unlock(&ses->chan_lock);
 348                         return &ses->chans[i];
 349                 }
 350         }
 351         spin_unlock(&ses->chan_lock);
 352         return NULL;
 353 }
 354
 355 static int
 356 cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
 357                      struct cifs_server_iface *iface)
 358 {
 359         struct TCP_Server_Info *chan_server;
 360         struct cifs_chan *chan;
 361         struct smb3_fs_context ctx = {NULL};
 362         static const char unc_fmt[] = "\\%s\\foo";
 363         char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
 364         struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
 365         struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
 366         int rc;
 367         unsigned int xid = get_xid();
 368
 369         if (iface->sockaddr.ss_family == AF_INET)
 370                 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
 371                          ses, iface->speed, iface->rdma_capable ? "yes" : "no",
 372                          &ipv4->sin_addr);
 373         else
 374                 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
 375                          ses, iface->speed, iface->rdma_capable ? "yes" : "no",
 376                          &ipv6->sin6_addr);
 377
 378         /*
 379          * Setup a ctx with mostly the same info as the existing
 380          * session and overwrite it with the requested iface data.
 381          *
 382          * We need to setup at least the fields used for negprot and
 383          * sesssetup.
 384          *
 385          * We only need the ctx here, so we can reuse memory from
 386          * the session and server without caring about memory
 387          * management.
 388          */
 389
 390         /* Always make new connection for now (TODO?) */
 391         ctx.nosharesock = true;
 392
 393         /* Auth */
 394         ctx.domainauto = ses->domainAuto;
 395         ctx.domainname = ses->domainName;
 396
 397         /* no hostname for extra channels */
 398         ctx.server_hostname = "";
 399
 400         ctx.username = ses->user_name;
 401         ctx.password = ses->password;
 402         ctx.sectype = ses->sectype;
 403         ctx.sign = ses->sign;
 404
 405         /* UNC and paths */
 406         /* XXX: Use ses->server->hostname? */
 407         sprintf(unc, unc_fmt, ses->ip_addr);
 408         ctx.UNC = unc;
 409         ctx.prepath = "";
 410
 411         /* Reuse same version as master connection */
 412         ctx.vals = ses->server->vals;
 413         ctx.ops = ses->server->ops;
 414
 415         ctx.noblocksnd = ses->server->noblocksnd;
 416         ctx.noautotune = ses->server->noautotune;
 417         ctx.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
 418         ctx.echo_interval = ses->server->echo_interval / HZ;
 419         ctx.max_credits = ses->server->max_credits;
 420
 421         /*
 422          * This will be used for encoding/decoding user/domain/pw
 423          * during sess setup auth.
 424          */
 425         ctx.local_nls = cifs_sb->local_nls;
 426
 427         /* Use RDMA if possible */
 428         ctx.rdma = iface->rdma_capable;
 429         memcpy(&ctx.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
 430
 431         /* reuse master con client guid */
 432         memcpy(&ctx.client_guid, ses->server->client_guid,
 433                SMB2_CLIENT_GUID_SIZE);
 434         ctx.use_client_guid = true;
 435
 436         chan_server = cifs_get_tcp_session(&ctx, ses->server);
 437
 438         spin_lock(&ses->chan_lock);
 439         chan = &ses->chans[ses->chan_count];
 440         chan->server = chan_server;
 441         if (IS_ERR(chan->server)) {
 442                 rc = PTR_ERR(chan->server);
 443                 chan->server = NULL;
 444                 spin_unlock(&ses->chan_lock);
 445                 goto out;
 446         }
 447         chan->iface = iface;
 448         ses->chan_count++;
 449         atomic_set(&ses->chan_seq, 0);
 450
 451         /* Mark this channel as needing connect/setup */
 452         cifs_chan_set_need_reconnect(ses, chan->server);
 453
 454         spin_unlock(&ses->chan_lock);
 455
 456         mutex_lock(&ses->session_mutex);
 457         /*
 458          * We need to allocate the server crypto now as we will need
 459          * to sign packets before we generate the channel signing key
 460          * (we sign with the session key)
 461          */
 462         rc = smb311_crypto_shash_allocate(chan->server);
 463         if (rc) {
 464                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
 465                 mutex_unlock(&ses->session_mutex);
 466                 goto out;
 467         }
 468
 469         rc = cifs_negotiate_protocol(xid, ses, chan->server);
 470         if (!rc)
 471                 rc = cifs_setup_session(xid, ses, chan->server, cifs_sb->local_nls);
 472
 473         mutex_unlock(&ses->session_mutex);
 474
 475 out:
 476         if (rc && chan->server) {
 477                 spin_lock(&ses->chan_lock);
 478                 /* we rely on all bits beyond chan_count to be clear */
 479                 cifs_chan_clear_need_reconnect(ses, chan->server);
 480                 ses->chan_count--;
 481                 /*
 482                  * chan_count should never reach 0 as at least the primary
 483                  * channel is always allocated
 484                  */
 485                 WARN_ON(ses->chan_count < 1);
 486                 spin_unlock(&ses->chan_lock);
 487         }
 488
 489         if (rc && chan->server)
 490                 cifs_put_tcp_session(chan->server, 0);
 491
 492         return rc;
 493 }
 494
 495 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
 496                              struct TCP_Server_Info *server,
 497                              SESSION_SETUP_ANDX *pSMB)
 498 {
 499         __u32 capabilities = 0;
 500
 501         /* init fields common to all four types of SessSetup */
 502         /* Note that offsets for first seven fields in req struct are same  */
 503         /*      in CIFS Specs so does not matter which of 3 forms of struct */
 504         /*      that we use in next few lines                               */
 505         /* Note that header is initialized to zero in header_assemble */
 506         pSMB->req.AndXCommand = 0xFF;
 507         pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
 508                                         CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
 509                                         USHRT_MAX));
 510         pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
 511         pSMB->req.VcNumber = cpu_to_le16(1);
 512
 513         /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
 514
 515         /* BB verify whether signing required on neg or just on auth frame
 516            (and NTLM case) */
 517
 518         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
 519                         CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
 520
 521         if (server->sign)
 522                 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
 523
 524         if (ses->capabilities & CAP_UNICODE) {
 525                 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
 526                 capabilities |= CAP_UNICODE;
 527         }
 528         if (ses->capabilities & CAP_STATUS32) {
 529                 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
 530                 capabilities |= CAP_STATUS32;
 531         }
 532         if (ses->capabilities & CAP_DFS) {
 533                 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
 534                 capabilities |= CAP_DFS;
 535         }
 536         if (ses->capabilities & CAP_UNIX)
 537                 capabilities |= CAP_UNIX;
 538
 539         return capabilities;
 540 }
 541
 542 static void
 543 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
 544 {
 545         char *bcc_ptr = *pbcc_area;
 546         int bytes_ret = 0;
 547
 548         /* Copy OS version */
 549         bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
 550                                     nls_cp);
 551         bcc_ptr += 2 * bytes_ret;
 552         bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
 553                                     32, nls_cp);
 554         bcc_ptr += 2 * bytes_ret;
 555         bcc_ptr += 2; /* trailing null */
 556
 557         bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
 558                                     32, nls_cp);
 559         bcc_ptr += 2 * bytes_ret;
 560         bcc_ptr += 2; /* trailing null */
 561
 562         *pbcc_area = bcc_ptr;
 563 }
 564
 565 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
 566                                    const struct nls_table *nls_cp)
 567 {
 568         char *bcc_ptr = *pbcc_area;
 569         int bytes_ret = 0;
 570
 571         /* copy domain */
 572         if (ses->domainName == NULL) {
 573                 /* Sending null domain better than using a bogus domain name (as
 574                 we did briefly in 2.6.18) since server will use its default */
 575                 *bcc_ptr = 0;
 576                 *(bcc_ptr+1) = 0;
 577                 bytes_ret = 0;
 578         } else
 579                 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
 580                                             CIFS_MAX_DOMAINNAME_LEN, nls_cp);
 581         bcc_ptr += 2 * bytes_ret;
 582         bcc_ptr += 2;  /* account for null terminator */
 583
 584         *pbcc_area = bcc_ptr;
 585 }
 586
 587
 588 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
 589                                    const struct nls_table *nls_cp)
 590 {
 591         char *bcc_ptr = *pbcc_area;
 592         int bytes_ret = 0;
 593
 594         /* BB FIXME add check that strings total less
 595         than 335 or will need to send them as arrays */
 596
 597         /* unicode strings, must be word aligned before the call */
 598 /*      if ((long) bcc_ptr % 2) {
 599                 *bcc_ptr = 0;
 600                 bcc_ptr++;
 601         } */
 602         /* copy user */
 603         if (ses->user_name == NULL) {
 604                 /* null user mount */
 605                 *bcc_ptr = 0;
 606                 *(bcc_ptr+1) = 0;
 607         } else {
 608                 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
 609                                             CIFS_MAX_USERNAME_LEN, nls_cp);
 610         }
 611         bcc_ptr += 2 * bytes_ret;
 612         bcc_ptr += 2; /* account for null termination */
 613
 614         unicode_domain_string(&bcc_ptr, ses, nls_cp);
 615         unicode_oslm_strings(&bcc_ptr, nls_cp);
 616
 617         *pbcc_area = bcc_ptr;
 618 }
 619
 620 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
 621                                  const struct nls_table *nls_cp)
 622 {
 623         char *bcc_ptr = *pbcc_area;
 624         int len;
 625
 626         /* copy user */
 627         /* BB what about null user mounts - check that we do this BB */
 628         /* copy user */
 629         if (ses->user_name != NULL) {
 630                 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
 631                 if (WARN_ON_ONCE(len < 0))
 632                         len = CIFS_MAX_USERNAME_LEN - 1;
 633                 bcc_ptr += len;
 634         }
 635         /* else null user mount */
 636         *bcc_ptr = 0;
 637         bcc_ptr++; /* account for null termination */
 638
 639         /* copy domain */
 640         if (ses->domainName != NULL) {
 641                 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
 642                 if (WARN_ON_ONCE(len < 0))
 643                         len = CIFS_MAX_DOMAINNAME_LEN - 1;
 644                 bcc_ptr += len;
 645         } /* else we will send a null domain name
 646              so the server will default to its own domain */
 647         *bcc_ptr = 0;
 648         bcc_ptr++;
 649
 650         /* BB check for overflow here */
 651
 652         strcpy(bcc_ptr, "Linux version ");
 653         bcc_ptr += strlen("Linux version ");
 654         strcpy(bcc_ptr, init_utsname()->release);
 655         bcc_ptr += strlen(init_utsname()->release) + 1;
 656
 657         strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
 658         bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
 659
 660         *pbcc_area = bcc_ptr;
 661 }
 662
 663 static void
 664 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
 665                       const struct nls_table *nls_cp)
 666 {
 667         int len;
 668         char *data = *pbcc_area;
 669
 670         cifs_dbg(FYI, "bleft %d\n", bleft);
 671
 672         kfree(ses->serverOS);
 673         ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
 674         cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
 675         len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
 676         data += len;
 677         bleft -= len;
 678         if (bleft <= 0)
 679                 return;
 680
 681         kfree(ses->serverNOS);
 682         ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
 683         cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
 684         len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
 685         data += len;
 686         bleft -= len;
 687         if (bleft <= 0)
 688                 return;
 689
 690         kfree(ses->serverDomain);
 691         ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
 692         cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
 693
 694         return;
 695 }
 696
 697 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
 698                                 struct cifs_ses *ses,
 699                                 const struct nls_table *nls_cp)
 700 {
 701         int len;
 702         char *bcc_ptr = *pbcc_area;
 703
 704         cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
 705
 706         len = strnlen(bcc_ptr, bleft);
 707         if (len >= bleft)
 708                 return;
 709
 710         kfree(ses->serverOS);
 711
 712         ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
 713         if (ses->serverOS) {
 714                 memcpy(ses->serverOS, bcc_ptr, len);
 715                 ses->serverOS[len] = 0;
 716                 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
 717                         cifs_dbg(FYI, "OS/2 server\n");
 718         }
 719
 720         bcc_ptr += len + 1;
 721         bleft -= len + 1;
 722
 723         len = strnlen(bcc_ptr, bleft);
 724         if (len >= bleft)
 725                 return;
 726
 727         kfree(ses->serverNOS);
 728
 729         ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
 730         if (ses->serverNOS) {
 731                 memcpy(ses->serverNOS, bcc_ptr, len);
 732                 ses->serverNOS[len] = 0;
 733         }
 734
 735         bcc_ptr += len + 1;
 736         bleft -= len + 1;
 737
 738         len = strnlen(bcc_ptr, bleft);
 739         if (len > bleft)
 740                 return;
 741
 742         /* No domain field in LANMAN case. Domain is
 743            returned by old servers in the SMB negprot response */
 744         /* BB For newer servers which do not support Unicode,
 745            but thus do return domain here we could add parsing
 746            for it later, but it is not very important */
 747         cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
 748 }
 749
 750 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
 751                                     struct cifs_ses *ses)
 752 {
 753         unsigned int tioffset; /* challenge message target info area */
 754         unsigned int tilen; /* challenge message target info area length  */
 755         CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
 756         __u32 server_flags;
 757
 758         if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
 759                 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
 760                 return -EINVAL;
 761         }
 762
 763         if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
 764                 cifs_dbg(VFS, "blob signature incorrect %s\n",
 765                          pblob->Signature);
 766                 return -EINVAL;
 767         }
 768         if (pblob->MessageType != NtLmChallenge) {
 769                 cifs_dbg(VFS, "Incorrect message type %d\n",
 770                          pblob->MessageType);
 771                 return -EINVAL;
 772         }
 773
 774         server_flags = le32_to_cpu(pblob->NegotiateFlags);
 775         cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
 776                  ses->ntlmssp->client_flags, server_flags);
 777
 778         if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
 779             (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
 780                 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
 781                          __func__);
 782                 return -EINVAL;
 783         }
 784         if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
 785                 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
 786                 return -EINVAL;
 787         }
 788         if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 789                 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
 790                          __func__);
 791                 return -EOPNOTSUPP;
 792         }
 793         if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
 794             !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
 795                 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
 796                              __func__);
 797
 798         ses->ntlmssp->server_flags = server_flags;
 799
 800         memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
 801         /* In particular we can examine sign flags */
 802         /* BB spec says that if AvId field of MsvAvTimestamp is populated then
 803                 we must set the MIC field of the AUTHENTICATE_MESSAGE */
 804
 805         tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
 806         tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
 807         if (tioffset > blob_len || tioffset + tilen > blob_len) {
 808                 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
 809                          tioffset, tilen);
 810                 return -EINVAL;
 811         }
 812         if (tilen) {
 813                 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
 814                                                  GFP_KERNEL);
 815                 if (!ses->auth_key.response) {
 816                         cifs_dbg(VFS, "Challenge target info alloc failure\n");
 817                         return -ENOMEM;
 818                 }
 819                 ses->auth_key.len = tilen;
 820         }
 821
 822         return 0;
 823 }
 824
 825 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
 826 {
 827         int sz = base_size + ses->auth_key.len
 828                 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
 829
 830         if (ses->domainName)
 831                 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
 832         else
 833                 sz += sizeof(__le16);
 834
 835         if (ses->user_name)
 836                 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
 837         else
 838                 sz += sizeof(__le16);
 839
 840         if (ses->workstation_name[0])
 841                 sz += sizeof(__le16) * strnlen(ses->workstation_name,
 842                                                ntlmssp_workstation_name_size(ses));
 843         else
 844                 sz += sizeof(__le16);
 845
 846         return sz;
 847 }
 848
 849 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
 850                                                  char *str_value,
 851                                                  int str_length,
 852                                                  unsigned char *pstart,
 853                                                  unsigned char **pcur,
 854                                                  const struct nls_table *nls_cp)
 855 {
 856         unsigned char *tmp = pstart;
 857         int len;
 858
 859         if (!pbuf)
 860                 return;
 861
 862         if (!pcur)
 863                 pcur = &tmp;
 864
 865         if (!str_value) {
 866                 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
 867                 pbuf->Length = 0;
 868                 pbuf->MaximumLength = 0;
 869                 *pcur += sizeof(__le16);
 870         } else {
 871                 len = cifs_strtoUTF16((__le16 *)*pcur,
 872                                       str_value,
 873                                       str_length,
 874                                       nls_cp);
 875                 len *= sizeof(__le16);
 876                 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
 877                 pbuf->Length = cpu_to_le16(len);
 878                 pbuf->MaximumLength = cpu_to_le16(len);
 879                 *pcur += len;
 880         }
 881 }
 882
 883 /* BB Move to ntlmssp.c eventually */
 884
 885 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
 886                                  u16 *buflen,
 887                                  struct cifs_ses *ses,
 888                                  struct TCP_Server_Info *server,
 889                                  const struct nls_table *nls_cp)
 890 {
 891         int rc = 0;
 892         NEGOTIATE_MESSAGE *sec_blob;
 893         __u32 flags;
 894         unsigned char *tmp;
 895         int len;
 896
 897         len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
 898         *pbuffer = kmalloc(len, GFP_KERNEL);
 899         if (!*pbuffer) {
 900                 rc = -ENOMEM;
 901                 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
 902                 *buflen = 0;
 903                 goto setup_ntlm_neg_ret;
 904         }
 905         sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
 906
 907         memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
 908         memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
 909         sec_blob->MessageType = NtLmNegotiate;
 910
 911         /* BB is NTLMV2 session security format easier to use here? */
 912         flags = NTLMSSP_NEGOTIATE_56 |  NTLMSSP_REQUEST_TARGET |
 913                 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
 914                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
 915                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
 916                 NTLMSSP_NEGOTIATE_SIGN;
 917         if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
 918                 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
 919
 920         tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
 921         ses->ntlmssp->client_flags = flags;
 922         sec_blob->NegotiateFlags = cpu_to_le32(flags);
 923
 924         /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
 925         cifs_security_buffer_from_str(&sec_blob->DomainName,
 926                                       NULL,
 927                                       CIFS_MAX_DOMAINNAME_LEN,
 928                                       *pbuffer, &tmp,
 929                                       nls_cp);
 930
 931         cifs_security_buffer_from_str(&sec_blob->WorkstationName,
 932                                       NULL,
 933                                       CIFS_MAX_WORKSTATION_LEN,
 934                                       *pbuffer, &tmp,
 935                                       nls_cp);
 936
 937         *buflen = tmp - *pbuffer;
 938 setup_ntlm_neg_ret:
 939         return rc;
 940 }
 941
 942 /*
 943  * Build ntlmssp blob with additional fields, such as version,
 944  * supported by modern servers. For safety limit to SMB3 or later
 945  * See notes in MS-NLMP Section 2.2.2.1 e.g.
 946  */
 947 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
 948                                  u16 *buflen,
 949                                  struct cifs_ses *ses,
 950                                  struct TCP_Server_Info *server,
 951                                  const struct nls_table *nls_cp)
 952 {
 953         int rc = 0;
 954         struct negotiate_message *sec_blob;
 955         __u32 flags;
 956         unsigned char *tmp;
 957         int len;
 958
 959         len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
 960         *pbuffer = kmalloc(len, GFP_KERNEL);
 961         if (!*pbuffer) {
 962                 rc = -ENOMEM;
 963                 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
 964                 *buflen = 0;
 965                 goto setup_ntlm_smb3_neg_ret;
 966         }
 967         sec_blob = (struct negotiate_message *)*pbuffer;
 968
 969         memset(*pbuffer, 0, sizeof(struct negotiate_message));
 970         memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
 971         sec_blob->MessageType = NtLmNegotiate;
 972
 973         /* BB is NTLMV2 session security format easier to use here? */
 974         flags = NTLMSSP_NEGOTIATE_56 |  NTLMSSP_REQUEST_TARGET |
 975                 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
 976                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
 977                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
 978                 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
 979         if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
 980                 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
 981
 982         sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
 983         sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
 984         sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
 985         sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
 986
 987         tmp = *pbuffer + sizeof(struct negotiate_message);
 988         ses->ntlmssp->client_flags = flags;
 989         sec_blob->NegotiateFlags = cpu_to_le32(flags);
 990
 991         /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
 992         cifs_security_buffer_from_str(&sec_blob->DomainName,
 993                                       NULL,
 994                                       CIFS_MAX_DOMAINNAME_LEN,
 995                                       *pbuffer, &tmp,
 996                                       nls_cp);
 997
 998         cifs_security_buffer_from_str(&sec_blob->WorkstationName,
 999                                       NULL,
1000                                       CIFS_MAX_WORKSTATION_LEN,
1001                                       *pbuffer, &tmp,
1002                                       nls_cp);
1003
1004         *buflen = tmp - *pbuffer;
1005 setup_ntlm_smb3_neg_ret:
1006         return rc;
1007 }
1008
1009
1010 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1011                                         u16 *buflen,
1012                                    struct cifs_ses *ses,
1013                                    struct TCP_Server_Info *server,
1014                                    const struct nls_table *nls_cp)
1015 {
1016         int rc;
1017         AUTHENTICATE_MESSAGE *sec_blob;
1018         __u32 flags;
1019         unsigned char *tmp;
1020         int len;
1021
1022         rc = setup_ntlmv2_rsp(ses, nls_cp);
1023         if (rc) {
1024                 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1025                 *buflen = 0;
1026                 goto setup_ntlmv2_ret;
1027         }
1028
1029         len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1030         *pbuffer = kmalloc(len, GFP_KERNEL);
1031         if (!*pbuffer) {
1032                 rc = -ENOMEM;
1033                 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1034                 *buflen = 0;
1035                 goto setup_ntlmv2_ret;
1036         }
1037         sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1038
1039         memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1040         sec_blob->MessageType = NtLmAuthenticate;
1041
1042         flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1043                 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1044
1045         tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1046         sec_blob->NegotiateFlags = cpu_to_le32(flags);
1047
1048         sec_blob->LmChallengeResponse.BufferOffset =
1049                                 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1050         sec_blob->LmChallengeResponse.Length = 0;
1051         sec_blob->LmChallengeResponse.MaximumLength = 0;
1052
1053         sec_blob->NtChallengeResponse.BufferOffset =
1054                                 cpu_to_le32(tmp - *pbuffer);
1055         if (ses->user_name != NULL) {
1056                 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1057                                 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1058                 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1059
1060                 sec_blob->NtChallengeResponse.Length =
1061                                 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1062                 sec_blob->NtChallengeResponse.MaximumLength =
1063                                 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1064         } else {
1065                 /*
1066                  * don't send an NT Response for anonymous access
1067                  */
1068                 sec_blob->NtChallengeResponse.Length = 0;
1069                 sec_blob->NtChallengeResponse.MaximumLength = 0;
1070         }
1071
1072         cifs_security_buffer_from_str(&sec_blob->DomainName,
1073                                       ses->domainName,
1074                                       CIFS_MAX_DOMAINNAME_LEN,
1075                                       *pbuffer, &tmp,
1076                                       nls_cp);
1077
1078         cifs_security_buffer_from_str(&sec_blob->UserName,
1079                                       ses->user_name,
1080                                       CIFS_MAX_USERNAME_LEN,
1081                                       *pbuffer, &tmp,
1082                                       nls_cp);
1083
1084         cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1085                                       ses->workstation_name,
1086                                       ntlmssp_workstation_name_size(ses),
1087                                       *pbuffer, &tmp,
1088                                       nls_cp);
1089
1090         if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1091             (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1092             !calc_seckey(ses)) {
1093                 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1094                 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1095                 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1096                 sec_blob->SessionKey.MaximumLength =
1097                                 cpu_to_le16(CIFS_CPHTXT_SIZE);
1098                 tmp += CIFS_CPHTXT_SIZE;
1099         } else {
1100                 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1101                 sec_blob->SessionKey.Length = 0;
1102                 sec_blob->SessionKey.MaximumLength = 0;
1103         }
1104
1105         *buflen = tmp - *pbuffer;
1106 setup_ntlmv2_ret:
1107         return rc;
1108 }
1109
1110 enum securityEnum
1111 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1112 {
1113         switch (server->negflavor) {
1114         case CIFS_NEGFLAVOR_EXTENDED:
1115                 switch (requested) {
1116                 case Kerberos:
1117                 case RawNTLMSSP:
1118                         return requested;
1119                 case Unspecified:
1120                         if (server->sec_ntlmssp &&
1121                             (global_secflags & CIFSSEC_MAY_NTLMSSP))
1122                                 return RawNTLMSSP;
1123                         if ((server->sec_kerberos || server->sec_mskerberos) &&
1124                             (global_secflags & CIFSSEC_MAY_KRB5))
1125                                 return Kerberos;
1126                         fallthrough;
1127                 default:
1128                         return Unspecified;
1129                 }
1130         case CIFS_NEGFLAVOR_UNENCAP:
1131                 switch (requested) {
1132                 case NTLMv2:
1133                         return requested;
1134                 case Unspecified:
1135                         if (global_secflags & CIFSSEC_MAY_NTLMV2)
1136                                 return NTLMv2;
1137                         break;
1138                 default:
1139                         break;
1140                 }
1141                 fallthrough;
1142         default:
1143                 return Unspecified;
1144         }
1145 }
1146
1147 struct sess_data {
1148         unsigned int xid;
1149         struct cifs_ses *ses;
1150         struct TCP_Server_Info *server;
1151         struct nls_table *nls_cp;
1152         void (*func)(struct sess_data *);
1153         int result;
1154
1155         /* we will send the SMB in three pieces:
1156          * a fixed length beginning part, an optional
1157          * SPNEGO blob (which can be zero length), and a
1158          * last part which will include the strings
1159          * and rest of bcc area. This allows us to avoid
1160          * a large buffer 17K allocation
1161          */
1162         int buf0_type;
1163         struct kvec iov[3];
1164 };
1165
1166 static int
1167 sess_alloc_buffer(struct sess_data *sess_data, int wct)
1168 {
1169         int rc;
1170         struct cifs_ses *ses = sess_data->ses;
1171         struct smb_hdr *smb_buf;
1172
1173         rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1174                                   (void **)&smb_buf);
1175
1176         if (rc)
1177                 return rc;
1178
1179         sess_data->iov[0].iov_base = (char *)smb_buf;
1180         sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1181         /*
1182          * This variable will be used to clear the buffer
1183          * allocated above in case of any error in the calling function.
1184          */
1185         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1186
1187         /* 2000 big enough to fit max user, domain, NOS name etc. */
1188         sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1189         if (!sess_data->iov[2].iov_base) {
1190                 rc = -ENOMEM;
1191                 goto out_free_smb_buf;
1192         }
1193
1194         return 0;
1195
1196 out_free_smb_buf:
1197         cifs_small_buf_release(smb_buf);
1198         sess_data->iov[0].iov_base = NULL;
1199         sess_data->iov[0].iov_len = 0;
1200         sess_data->buf0_type = CIFS_NO_BUFFER;
1201         return rc;
1202 }
1203
1204 static void
1205 sess_free_buffer(struct sess_data *sess_data)
1206 {
1207
1208         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1209         sess_data->buf0_type = CIFS_NO_BUFFER;
1210         kfree(sess_data->iov[2].iov_base);
1211 }
1212
1213 static int
1214 sess_establish_session(struct sess_data *sess_data)
1215 {
1216         struct cifs_ses *ses = sess_data->ses;
1217         struct TCP_Server_Info *server = sess_data->server;
1218
1219         cifs_server_lock(server);
1220         if (!server->session_estab) {
1221                 if (server->sign) {
1222                         server->session_key.response =
1223                                 kmemdup(ses->auth_key.response,
1224                                 ses->auth_key.len, GFP_KERNEL);
1225                         if (!server->session_key.response) {
1226                                 cifs_server_unlock(server);
1227                                 return -ENOMEM;
1228                         }
1229                         server->session_key.len =
1230                                                 ses->auth_key.len;
1231                 }
1232                 server->sequence_number = 0x2;
1233                 server->session_estab = true;
1234         }
1235         cifs_server_unlock(server);
1236
1237         cifs_dbg(FYI, "CIFS session established successfully\n");
1238         return 0;
1239 }
1240
1241 static int
1242 sess_sendreceive(struct sess_data *sess_data)
1243 {
1244         int rc;
1245         struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1246         __u16 count;
1247         struct kvec rsp_iov = { NULL, 0 };
1248
1249         count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1250         be32_add_cpu(&smb_buf->smb_buf_length, count);
1251         put_bcc(count, smb_buf);
1252
1253         rc = SendReceive2(sess_data->xid, sess_data->ses,
1254                           sess_data->iov, 3 /* num_iovecs */,
1255                           &sess_data->buf0_type,
1256                           CIFS_LOG_ERROR, &rsp_iov);
1257         cifs_small_buf_release(sess_data->iov[0].iov_base);
1258         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1259
1260         return rc;
1261 }
1262
1263 static void
1264 sess_auth_ntlmv2(struct sess_data *sess_data)
1265 {
1266         int rc = 0;
1267         struct smb_hdr *smb_buf;
1268         SESSION_SETUP_ANDX *pSMB;
1269         char *bcc_ptr;
1270         struct cifs_ses *ses = sess_data->ses;
1271         struct TCP_Server_Info *server = sess_data->server;
1272         __u32 capabilities;
1273         __u16 bytes_remaining;
1274
1275         /* old style NTLM sessionsetup */
1276         /* wct = 13 */
1277         rc = sess_alloc_buffer(sess_data, 13);
1278         if (rc)
1279                 goto out;
1280
1281         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1282         bcc_ptr = sess_data->iov[2].iov_base;
1283         capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1284
1285         pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1286
1287         /* LM2 password would be here if we supported it */
1288         pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1289
1290         if (ses->user_name != NULL) {
1291                 /* calculate nlmv2 response and session key */
1292                 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1293                 if (rc) {
1294                         cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1295                         goto out;
1296                 }
1297
1298                 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1299                                 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1300                 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1301
1302                 /* set case sensitive password length after tilen may get
1303                  * assigned, tilen is 0 otherwise.
1304                  */
1305                 pSMB->req_no_secext.CaseSensitivePasswordLength =
1306                         cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1307         } else {
1308                 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1309         }
1310
1311         if (ses->capabilities & CAP_UNICODE) {
1312                 if (sess_data->iov[0].iov_len % 2) {
1313                         *bcc_ptr = 0;
1314                         bcc_ptr++;
1315                 }
1316                 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1317         } else {
1318                 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1319         }
1320
1321
1322         sess_data->iov[2].iov_len = (long) bcc_ptr -
1323                         (long) sess_data->iov[2].iov_base;
1324
1325         rc = sess_sendreceive(sess_data);
1326         if (rc)
1327                 goto out;
1328
1329         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1330         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1331
1332         if (smb_buf->WordCount != 3) {
1333                 rc = -EIO;
1334                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1335                 goto out;
1336         }
1337
1338         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1339                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1340
1341         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1342         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1343
1344         bytes_remaining = get_bcc(smb_buf);
1345         bcc_ptr = pByteArea(smb_buf);
1346
1347         /* BB check if Unicode and decode strings */
1348         if (bytes_remaining == 0) {
1349                 /* no string area to decode, do nothing */
1350         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1351                 /* unicode string area must be word-aligned */
1352                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1353                         ++bcc_ptr;
1354                         --bytes_remaining;
1355                 }
1356                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1357                                       sess_data->nls_cp);
1358         } else {
1359                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1360                                     sess_data->nls_cp);
1361         }
1362
1363         rc = sess_establish_session(sess_data);
1364 out:
1365         sess_data->result = rc;
1366         sess_data->func = NULL;
1367         sess_free_buffer(sess_data);
1368         kfree(ses->auth_key.response);
1369         ses->auth_key.response = NULL;
1370 }
1371
1372 #ifdef CONFIG_CIFS_UPCALL
1373 static void
1374 sess_auth_kerberos(struct sess_data *sess_data)
1375 {
1376         int rc = 0;
1377         struct smb_hdr *smb_buf;
1378         SESSION_SETUP_ANDX *pSMB;
1379         char *bcc_ptr;
1380         struct cifs_ses *ses = sess_data->ses;
1381         struct TCP_Server_Info *server = sess_data->server;
1382         __u32 capabilities;
1383         __u16 bytes_remaining;
1384         struct key *spnego_key = NULL;
1385         struct cifs_spnego_msg *msg;
1386         u16 blob_len;
1387
1388         /* extended security */
1389         /* wct = 12 */
1390         rc = sess_alloc_buffer(sess_data, 12);
1391         if (rc)
1392                 goto out;
1393
1394         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1395         bcc_ptr = sess_data->iov[2].iov_base;
1396         capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1397
1398         spnego_key = cifs_get_spnego_key(ses, server);
1399         if (IS_ERR(spnego_key)) {
1400                 rc = PTR_ERR(spnego_key);
1401                 spnego_key = NULL;
1402                 goto out;
1403         }
1404
1405         msg = spnego_key->payload.data[0];
1406         /*
1407          * check version field to make sure that cifs.upcall is
1408          * sending us a response in an expected form
1409          */
1410         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1411                 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1412                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1413                 rc = -EKEYREJECTED;
1414                 goto out_put_spnego_key;
1415         }
1416
1417         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1418                                          GFP_KERNEL);
1419         if (!ses->auth_key.response) {
1420                 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1421                          msg->sesskey_len);
1422                 rc = -ENOMEM;
1423                 goto out_put_spnego_key;
1424         }
1425         ses->auth_key.len = msg->sesskey_len;
1426
1427         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1428         capabilities |= CAP_EXTENDED_SECURITY;
1429         pSMB->req.Capabilities = cpu_to_le32(capabilities);
1430         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1431         sess_data->iov[1].iov_len = msg->secblob_len;
1432         pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1433
1434         if (ses->capabilities & CAP_UNICODE) {
1435                 /* unicode strings must be word aligned */
1436                 if ((sess_data->iov[0].iov_len
1437                         + sess_data->iov[1].iov_len) % 2) {
1438                         *bcc_ptr = 0;
1439                         bcc_ptr++;
1440                 }
1441                 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1442                 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1443         } else {
1444                 /* BB: is this right? */
1445                 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1446         }
1447
1448         sess_data->iov[2].iov_len = (long) bcc_ptr -
1449                         (long) sess_data->iov[2].iov_base;
1450
1451         rc = sess_sendreceive(sess_data);
1452         if (rc)
1453                 goto out_put_spnego_key;
1454
1455         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1456         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1457
1458         if (smb_buf->WordCount != 4) {
1459                 rc = -EIO;
1460                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1461                 goto out_put_spnego_key;
1462         }
1463
1464         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1465                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1466
1467         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1468         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1469
1470         bytes_remaining = get_bcc(smb_buf);
1471         bcc_ptr = pByteArea(smb_buf);
1472
1473         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1474         if (blob_len > bytes_remaining) {
1475                 cifs_dbg(VFS, "bad security blob length %d\n",
1476                                 blob_len);
1477                 rc = -EINVAL;
1478                 goto out_put_spnego_key;
1479         }
1480         bcc_ptr += blob_len;
1481         bytes_remaining -= blob_len;
1482
1483         /* BB check if Unicode and decode strings */
1484         if (bytes_remaining == 0) {
1485                 /* no string area to decode, do nothing */
1486         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1487                 /* unicode string area must be word-aligned */
1488                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1489                         ++bcc_ptr;
1490                         --bytes_remaining;
1491                 }
1492                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1493                                       sess_data->nls_cp);
1494         } else {
1495                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1496                                     sess_data->nls_cp);
1497         }
1498
1499         rc = sess_establish_session(sess_data);
1500 out_put_spnego_key:
1501         key_invalidate(spnego_key);
1502         key_put(spnego_key);
1503 out:
1504         sess_data->result = rc;
1505         sess_data->func = NULL;
1506         sess_free_buffer(sess_data);
1507         kfree(ses->auth_key.response);
1508         ses->auth_key.response = NULL;
1509 }
1510
1511 #endif /* ! CONFIG_CIFS_UPCALL */
1512
1513 /*
1514  * The required kvec buffers have to be allocated before calling this
1515  * function.
1516  */
1517 static int
1518 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1519 {
1520         SESSION_SETUP_ANDX *pSMB;
1521         struct cifs_ses *ses = sess_data->ses;
1522         struct TCP_Server_Info *server = sess_data->server;
1523         __u32 capabilities;
1524         char *bcc_ptr;
1525
1526         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1527
1528         capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1529         if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1530                 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1531                 return -ENOSYS;
1532         }
1533
1534         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1535         capabilities |= CAP_EXTENDED_SECURITY;
1536         pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1537
1538         bcc_ptr = sess_data->iov[2].iov_base;
1539         /* unicode strings must be word aligned */
1540         if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1541                 *bcc_ptr = 0;
1542                 bcc_ptr++;
1543         }
1544         unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1545
1546         sess_data->iov[2].iov_len = (long) bcc_ptr -
1547                                         (long) sess_data->iov[2].iov_base;
1548
1549         return 0;
1550 }
1551
1552 static void
1553 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1554
1555 static void
1556 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1557 {
1558         int rc;
1559         struct smb_hdr *smb_buf;
1560         SESSION_SETUP_ANDX *pSMB;
1561         struct cifs_ses *ses = sess_data->ses;
1562         struct TCP_Server_Info *server = sess_data->server;
1563         __u16 bytes_remaining;
1564         char *bcc_ptr;
1565         unsigned char *ntlmsspblob = NULL;
1566         u16 blob_len;
1567
1568         cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1569
1570         /*
1571          * if memory allocation is successful, caller of this function
1572          * frees it.
1573          */
1574         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1575         if (!ses->ntlmssp) {
1576                 rc = -ENOMEM;
1577                 goto out;
1578         }
1579         ses->ntlmssp->sesskey_per_smbsess = false;
1580
1581         /* wct = 12 */
1582         rc = sess_alloc_buffer(sess_data, 12);
1583         if (rc)
1584                 goto out;
1585
1586         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1587
1588         /* Build security blob before we assemble the request */
1589         rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1590                                      &blob_len, ses, server,
1591                                      sess_data->nls_cp);
1592         if (rc)
1593                 goto out_free_ntlmsspblob;
1594
1595         sess_data->iov[1].iov_len = blob_len;
1596         sess_data->iov[1].iov_base = ntlmsspblob;
1597         pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1598
1599         rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1600         if (rc)
1601                 goto out_free_ntlmsspblob;
1602
1603         rc = sess_sendreceive(sess_data);
1604
1605         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1606         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1607
1608         /* If true, rc here is expected and not an error */
1609         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1610             smb_buf->Status.CifsError ==
1611                         cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1612                 rc = 0;
1613
1614         if (rc)
1615                 goto out_free_ntlmsspblob;
1616
1617         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1618
1619         if (smb_buf->WordCount != 4) {
1620                 rc = -EIO;
1621                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1622                 goto out_free_ntlmsspblob;
1623         }
1624
1625         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1626         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1627
1628         bytes_remaining = get_bcc(smb_buf);
1629         bcc_ptr = pByteArea(smb_buf);
1630
1631         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1632         if (blob_len > bytes_remaining) {
1633                 cifs_dbg(VFS, "bad security blob length %d\n",
1634                                 blob_len);
1635                 rc = -EINVAL;
1636                 goto out_free_ntlmsspblob;
1637         }
1638
1639         rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1640
1641 out_free_ntlmsspblob:
1642         kfree(ntlmsspblob);
1643 out:
1644         sess_free_buffer(sess_data);
1645
1646         if (!rc) {
1647                 sess_data->func = sess_auth_rawntlmssp_authenticate;
1648                 return;
1649         }
1650
1651         /* Else error. Cleanup */
1652         kfree(ses->auth_key.response);
1653         ses->auth_key.response = NULL;
1654         kfree(ses->ntlmssp);
1655         ses->ntlmssp = NULL;
1656
1657         sess_data->func = NULL;
1658         sess_data->result = rc;
1659 }
1660
1661 static void
1662 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1663 {
1664         int rc;
1665         struct smb_hdr *smb_buf;
1666         SESSION_SETUP_ANDX *pSMB;
1667         struct cifs_ses *ses = sess_data->ses;
1668         struct TCP_Server_Info *server = sess_data->server;
1669         __u16 bytes_remaining;
1670         char *bcc_ptr;
1671         unsigned char *ntlmsspblob = NULL;
1672         u16 blob_len;
1673
1674         cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1675
1676         /* wct = 12 */
1677         rc = sess_alloc_buffer(sess_data, 12);
1678         if (rc)
1679                 goto out;
1680
1681         /* Build security blob before we assemble the request */
1682         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1683         smb_buf = (struct smb_hdr *)pSMB;
1684         rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1685                                         &blob_len, ses, server,
1686                                         sess_data->nls_cp);
1687         if (rc)
1688                 goto out_free_ntlmsspblob;
1689         sess_data->iov[1].iov_len = blob_len;
1690         sess_data->iov[1].iov_base = ntlmsspblob;
1691         pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1692         /*
1693          * Make sure that we tell the server that we are using
1694          * the uid that it just gave us back on the response
1695          * (challenge)
1696          */
1697         smb_buf->Uid = ses->Suid;
1698
1699         rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1700         if (rc)
1701                 goto out_free_ntlmsspblob;
1702
1703         rc = sess_sendreceive(sess_data);
1704         if (rc)
1705                 goto out_free_ntlmsspblob;
1706
1707         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1708         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1709         if (smb_buf->WordCount != 4) {
1710                 rc = -EIO;
1711                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1712                 goto out_free_ntlmsspblob;
1713         }
1714
1715         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1716                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1717
1718         if (ses->Suid != smb_buf->Uid) {
1719                 ses->Suid = smb_buf->Uid;
1720                 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1721         }
1722
1723         bytes_remaining = get_bcc(smb_buf);
1724         bcc_ptr = pByteArea(smb_buf);
1725         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1726         if (blob_len > bytes_remaining) {
1727                 cifs_dbg(VFS, "bad security blob length %d\n",
1728                                 blob_len);
1729                 rc = -EINVAL;
1730                 goto out_free_ntlmsspblob;
1731         }
1732         bcc_ptr += blob_len;
1733         bytes_remaining -= blob_len;
1734
1735
1736         /* BB check if Unicode and decode strings */
1737         if (bytes_remaining == 0) {
1738                 /* no string area to decode, do nothing */
1739         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1740                 /* unicode string area must be word-aligned */
1741                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1742                         ++bcc_ptr;
1743                         --bytes_remaining;
1744                 }
1745                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1746                                       sess_data->nls_cp);
1747         } else {
1748                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1749                                     sess_data->nls_cp);
1750         }
1751
1752 out_free_ntlmsspblob:
1753         kfree(ntlmsspblob);
1754 out:
1755         sess_free_buffer(sess_data);
1756
1757         if (!rc)
1758                 rc = sess_establish_session(sess_data);
1759
1760         /* Cleanup */
1761         kfree(ses->auth_key.response);
1762         ses->auth_key.response = NULL;
1763         kfree(ses->ntlmssp);
1764         ses->ntlmssp = NULL;
1765
1766         sess_data->func = NULL;
1767         sess_data->result = rc;
1768 }
1769
1770 static int select_sec(struct sess_data *sess_data)
1771 {
1772         int type;
1773         struct cifs_ses *ses = sess_data->ses;
1774         struct TCP_Server_Info *server = sess_data->server;
1775
1776         type = cifs_select_sectype(server, ses->sectype);
1777         cifs_dbg(FYI, "sess setup type %d\n", type);
1778         if (type == Unspecified) {
1779                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1780                 return -EINVAL;
1781         }
1782
1783         switch (type) {
1784         case NTLMv2:
1785                 sess_data->func = sess_auth_ntlmv2;
1786                 break;
1787         case Kerberos:
1788 #ifdef CONFIG_CIFS_UPCALL
1789                 sess_data->func = sess_auth_kerberos;
1790                 break;
1791 #else
1792                 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1793                 return -ENOSYS;
1794 #endif /* CONFIG_CIFS_UPCALL */
1795         case RawNTLMSSP:
1796                 sess_data->func = sess_auth_rawntlmssp_negotiate;
1797                 break;
1798         default:
1799                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1800                 return -ENOSYS;
1801         }
1802
1803         return 0;
1804 }
1805
1806 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1807                    struct TCP_Server_Info *server,
1808                    const struct nls_table *nls_cp)
1809 {
1810         int rc = 0;
1811         struct sess_data *sess_data;
1812
1813         if (ses == NULL) {
1814                 WARN(1, "%s: ses == NULL!", __func__);
1815                 return -EINVAL;
1816         }
1817
1818         sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1819         if (!sess_data)
1820                 return -ENOMEM;
1821
1822         sess_data->xid = xid;
1823         sess_data->ses = ses;
1824         sess_data->server = server;
1825         sess_data->buf0_type = CIFS_NO_BUFFER;
1826         sess_data->nls_cp = (struct nls_table *) nls_cp;
1827
1828         rc = select_sec(sess_data);
1829         if (rc)
1830                 goto out;
1831
1832         while (sess_data->func)
1833                 sess_data->func(sess_data);
1834
1835         /* Store result before we free sess_data */
1836         rc = sess_data->result;
1837
1838 out:
1839         kfree(sess_data);
1840         return rc;
1841 }