fs/smb/client/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_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 int
  73 cifs_ses_get_chan_index(struct cifs_ses *ses,
  74                         struct TCP_Server_Info *server)
  75 {
  76         unsigned int i;
  77
  78         /* if the channel is waiting for termination */
  79         if (server && server->terminate)
  80                 return CIFS_INVAL_CHAN_INDEX;
  81
  82         for (i = 0; i < ses->chan_count; i++) {
  83                 if (ses->chans[i].server == server)
  84                         return i;
  85         }
  86
  87         /* If we didn't find the channel, it is likely a bug */
  88         if (server)
  89                 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
  90                          server->conn_id);
  91         return CIFS_INVAL_CHAN_INDEX;
  92 }
  93
  94 void
  95 cifs_chan_set_in_reconnect(struct cifs_ses *ses,
  96                              struct TCP_Server_Info *server)
  97 {
  98         int chan_index = cifs_ses_get_chan_index(ses, server);
  99
 100         if (chan_index == CIFS_INVAL_CHAN_INDEX)
 101                 return;
 102
 103         ses->chans[chan_index].in_reconnect = true;
 104 }
 105
 106 void
 107 cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
 108                              struct TCP_Server_Info *server)
 109 {
 110         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 111
 112         if (chan_index == CIFS_INVAL_CHAN_INDEX)
 113                 return;
 114
 115         ses->chans[chan_index].in_reconnect = false;
 116 }
 117
 118 bool
 119 cifs_chan_in_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         if (chan_index == CIFS_INVAL_CHAN_INDEX)
 125                 return true;    /* err on the safer side */
 126
 127         return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
 128 }
 129
 130 void
 131 cifs_chan_set_need_reconnect(struct cifs_ses *ses,
 132                              struct TCP_Server_Info *server)
 133 {
 134         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 135
 136         if (chan_index == CIFS_INVAL_CHAN_INDEX)
 137                 return;
 138
 139         set_bit(chan_index, &ses->chans_need_reconnect);
 140         cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
 141                  chan_index, ses->chans_need_reconnect);
 142 }
 143
 144 void
 145 cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
 146                                struct TCP_Server_Info *server)
 147 {
 148         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 149
 150         if (chan_index == CIFS_INVAL_CHAN_INDEX)
 151                 return;
 152
 153         clear_bit(chan_index, &ses->chans_need_reconnect);
 154         cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
 155                  chan_index, ses->chans_need_reconnect);
 156 }
 157
 158 bool
 159 cifs_chan_needs_reconnect(struct cifs_ses *ses,
 160                           struct TCP_Server_Info *server)
 161 {
 162         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 163
 164         if (chan_index == CIFS_INVAL_CHAN_INDEX)
 165                 return true;    /* err on the safer side */
 166
 167         return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
 168 }
 169
 170 bool
 171 cifs_chan_is_iface_active(struct cifs_ses *ses,
 172                           struct TCP_Server_Info *server)
 173 {
 174         unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
 175
 176         if (chan_index == CIFS_INVAL_CHAN_INDEX)
 177                 return true;    /* err on the safer side */
 178
 179         return ses->chans[chan_index].iface &&
 180                 ses->chans[chan_index].iface->is_active;
 181 }
 182
 183 /* returns number of channels added */
 184 int cifs_try_adding_channels(struct cifs_ses *ses)
 185 {
 186         struct TCP_Server_Info *server = ses->server;
 187         int old_chan_count, new_chan_count;
 188         int left;
 189         int rc = 0;
 190         int tries = 0;
 191         size_t iface_weight = 0, iface_min_speed = 0;
 192         struct cifs_server_iface *iface = NULL, *niface = NULL;
 193         struct cifs_server_iface *last_iface = NULL;
 194
 195         spin_lock(&ses->chan_lock);
 196
 197         new_chan_count = old_chan_count = ses->chan_count;
 198         left = ses->chan_max - ses->chan_count;
 199
 200         if (left <= 0) {
 201                 spin_unlock(&ses->chan_lock);
 202                 cifs_dbg(FYI,
 203                          "ses already at max_channels (%zu), nothing to open\n",
 204                          ses->chan_max);
 205                 return 0;
 206         }
 207
 208         if (server->dialect < SMB30_PROT_ID) {
 209                 spin_unlock(&ses->chan_lock);
 210                 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
 211                 return 0;
 212         }
 213
 214         if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 215                 spin_unlock(&ses->chan_lock);
 216                 cifs_server_dbg(VFS, "no multichannel support\n");
 217                 return 0;
 218         }
 219         spin_unlock(&ses->chan_lock);
 220
 221         while (left > 0) {
 222
 223                 tries++;
 224                 if (tries > 3*ses->chan_max) {
 225                         cifs_dbg(VFS, "too many channel open attempts (%d channels left to open)\n",
 226                                  left);
 227                         break;
 228                 }
 229
 230                 spin_lock(&ses->iface_lock);
 231                 if (!ses->iface_count) {
 232                         spin_unlock(&ses->iface_lock);
 233                         cifs_dbg(VFS, "server %s does not advertise interfaces\n",
 234                                       ses->server->hostname);
 235                         break;
 236                 }
 237
 238                 if (!iface)
 239                         iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
 240                                                  iface_head);
 241                 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,
 242                                              iface_head);
 243                 iface_min_speed = last_iface->speed;
 244
 245                 list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
 246                                     iface_head) {
 247                         /* do not mix rdma and non-rdma interfaces */
 248                         if (iface->rdma_capable != ses->server->rdma)
 249                                 continue;
 250
 251                         /* skip ifaces that are unusable */
 252                         if (!iface->is_active ||
 253                             (is_ses_using_iface(ses, iface) &&
 254                              !iface->rss_capable))
 255                                 continue;
 256
 257                         /* check if we already allocated enough channels */
 258                         iface_weight = iface->speed / iface_min_speed;
 259
 260                         if (iface->weight_fulfilled >= iface_weight)
 261                                 continue;
 262
 263                         /* take ref before unlock */
 264                         kref_get(&iface->refcount);
 265
 266                         spin_unlock(&ses->iface_lock);
 267                         rc = cifs_ses_add_channel(ses, iface);
 268                         spin_lock(&ses->iface_lock);
 269
 270                         if (rc) {
 271                                 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
 272                                          &iface->sockaddr,
 273                                          rc);
 274                                 kref_put(&iface->refcount, release_iface);
 275                                 /* failure to add chan should increase weight */
 276                                 iface->weight_fulfilled++;
 277                                 continue;
 278                         }
 279
 280                         iface->num_channels++;
 281                         iface->weight_fulfilled++;
 282                         cifs_dbg(VFS, "successfully opened new channel on iface:%pIS\n",
 283                                  &iface->sockaddr);
 284                         break;
 285                 }
 286
 287                 /* reached end of list. reset weight_fulfilled and start over */
 288                 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
 289                         list_for_each_entry(iface, &ses->iface_list, iface_head)
 290                                 iface->weight_fulfilled = 0;
 291                         spin_unlock(&ses->iface_lock);
 292                         iface = NULL;
 293                         continue;
 294                 }
 295                 spin_unlock(&ses->iface_lock);
 296
 297                 left--;
 298                 new_chan_count++;
 299         }
 300
 301         return new_chan_count - old_chan_count;
 302 }
 303
 304 /*
 305  * called when multichannel is disabled by the server.
 306  * this always gets called from smb2_reconnect
 307  * and cannot get called in parallel threads.
 308  */
 309 void
 310 cifs_disable_secondary_channels(struct cifs_ses *ses)
 311 {
 312         int i, chan_count;
 313         struct TCP_Server_Info *server;
 314         struct cifs_server_iface *iface;
 315
 316         spin_lock(&ses->chan_lock);
 317         chan_count = ses->chan_count;
 318         if (chan_count == 1)
 319                 goto done;
 320
 321         ses->chan_count = 1;
 322
 323         /* for all secondary channels reset the need reconnect bit */
 324         ses->chans_need_reconnect &= 1;
 325
 326         for (i = 1; i < chan_count; i++) {
 327                 iface = ses->chans[i].iface;
 328                 server = ses->chans[i].server;
 329
 330                 /*
 331                  * remove these references first, since we need to unlock
 332                  * the chan_lock here, since iface_lock is a higher lock
 333                  */
 334                 ses->chans[i].iface = NULL;
 335                 ses->chans[i].server = NULL;
 336                 spin_unlock(&ses->chan_lock);
 337
 338                 if (iface) {
 339                         spin_lock(&ses->iface_lock);
 340                         iface->num_channels--;
 341                         if (iface->weight_fulfilled)
 342                                 iface->weight_fulfilled--;
 343                         kref_put(&iface->refcount, release_iface);
 344                         spin_unlock(&ses->iface_lock);
 345                 }
 346
 347                 if (server) {
 348                         if (!server->terminate) {
 349                                 server->terminate = true;
 350                                 cifs_signal_cifsd_for_reconnect(server, false);
 351                         }
 352                         cifs_put_tcp_session(server, false);
 353                 }
 354
 355                 spin_lock(&ses->chan_lock);
 356         }
 357
 358 done:
 359         spin_unlock(&ses->chan_lock);
 360 }
 361
 362 /*
 363  * update the iface for the channel if necessary.
 364  * Must be called with chan_lock held.
 365  */
 366 void
 367 cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
 368 {
 369         unsigned int chan_index;
 370         size_t iface_weight = 0, iface_min_speed = 0;
 371         struct cifs_server_iface *iface = NULL;
 372         struct cifs_server_iface *old_iface = NULL;
 373         struct cifs_server_iface *last_iface = NULL;
 374         struct sockaddr_storage ss;
 375
 376         spin_lock(&ses->chan_lock);
 377         chan_index = cifs_ses_get_chan_index(ses, server);
 378         if (chan_index == CIFS_INVAL_CHAN_INDEX) {
 379                 spin_unlock(&ses->chan_lock);
 380                 return;
 381         }
 382
 383         if (ses->chans[chan_index].iface) {
 384                 old_iface = ses->chans[chan_index].iface;
 385                 if (old_iface->is_active) {
 386                         spin_unlock(&ses->chan_lock);
 387                         return;
 388                 }
 389         }
 390         spin_unlock(&ses->chan_lock);
 391
 392         spin_lock(&server->srv_lock);
 393         ss = server->dstaddr;
 394         spin_unlock(&server->srv_lock);
 395
 396         spin_lock(&ses->iface_lock);
 397         if (!ses->iface_count) {
 398                 spin_unlock(&ses->iface_lock);
 399                 cifs_dbg(VFS, "server %s does not advertise interfaces\n", ses->server->hostname);
 400                 return;
 401         }
 402
 403         last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,
 404                                      iface_head);
 405         iface_min_speed = last_iface->speed;
 406
 407         /* then look for a new one */
 408         list_for_each_entry(iface, &ses->iface_list, iface_head) {
 409                 if (!chan_index) {
 410                         /* if we're trying to get the updated iface for primary channel */
 411                         if (!cifs_match_ipaddr((struct sockaddr *) &ss,
 412                                                (struct sockaddr *) &iface->sockaddr))
 413                                 continue;
 414
 415                         kref_get(&iface->refcount);
 416                         break;
 417                 }
 418
 419                 /* do not mix rdma and non-rdma interfaces */
 420                 if (iface->rdma_capable != server->rdma)
 421                         continue;
 422
 423                 if (!iface->is_active ||
 424                     (is_ses_using_iface(ses, iface) &&
 425                      !iface->rss_capable)) {
 426                         continue;
 427                 }
 428
 429                 /* check if we already allocated enough channels */
 430                 iface_weight = iface->speed / iface_min_speed;
 431
 432                 if (iface->weight_fulfilled >= iface_weight)
 433                         continue;
 434
 435                 kref_get(&iface->refcount);
 436                 break;
 437         }
 438
 439         if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
 440                 iface = NULL;
 441                 cifs_dbg(FYI, "unable to find a suitable iface\n");
 442         }
 443
 444         if (!iface) {
 445                 if (!chan_index)
 446                         cifs_dbg(FYI, "unable to get the interface matching: %pIS\n",
 447                                  &ss);
 448                 else {
 449                         cifs_dbg(FYI, "unable to find another interface to replace: %pIS\n",
 450                                  &old_iface->sockaddr);
 451                 }
 452
 453                 spin_unlock(&ses->iface_lock);
 454                 return;
 455         }
 456
 457         /* now drop the ref to the current iface */
 458         if (old_iface) {
 459                 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
 460                          &old_iface->sockaddr,
 461                          &iface->sockaddr);
 462
 463                 old_iface->num_channels--;
 464                 if (old_iface->weight_fulfilled)
 465                         old_iface->weight_fulfilled--;
 466                 iface->num_channels++;
 467                 iface->weight_fulfilled++;
 468
 469                 kref_put(&old_iface->refcount, release_iface);
 470         } else if (!chan_index) {
 471                 /* special case: update interface for primary channel */
 472                 cifs_dbg(FYI, "referencing primary channel iface: %pIS\n",
 473                          &iface->sockaddr);
 474                 iface->num_channels++;
 475                 iface->weight_fulfilled++;
 476         }
 477         spin_unlock(&ses->iface_lock);
 478
 479         spin_lock(&ses->chan_lock);
 480         chan_index = cifs_ses_get_chan_index(ses, server);
 481         if (chan_index == CIFS_INVAL_CHAN_INDEX) {
 482                 spin_unlock(&ses->chan_lock);
 483                 return;
 484         }
 485
 486         ses->chans[chan_index].iface = iface;
 487         spin_unlock(&ses->chan_lock);
 488 }
 489
 490 /*
 491  * If server is a channel of ses, return the corresponding enclosing
 492  * cifs_chan otherwise return NULL.
 493  */
 494 struct cifs_chan *
 495 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
 496 {
 497         int i;
 498
 499         spin_lock(&ses->chan_lock);
 500         for (i = 0; i < ses->chan_count; i++) {
 501                 if (ses->chans[i].server == server) {
 502                         spin_unlock(&ses->chan_lock);
 503                         return &ses->chans[i];
 504                 }
 505         }
 506         spin_unlock(&ses->chan_lock);
 507         return NULL;
 508 }
 509
 510 static int
 511 cifs_ses_add_channel(struct cifs_ses *ses,
 512                      struct cifs_server_iface *iface)
 513 {
 514         struct TCP_Server_Info *chan_server;
 515         struct cifs_chan *chan;
 516         struct smb3_fs_context *ctx;
 517         static const char unc_fmt[] = "\\%s\\foo";
 518         struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
 519         struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
 520         size_t len;
 521         int rc;
 522         unsigned int xid = get_xid();
 523
 524         if (iface->sockaddr.ss_family == AF_INET)
 525                 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
 526                          ses, iface->speed, iface->rdma_capable ? "yes" : "no",
 527                          &ipv4->sin_addr);
 528         else
 529                 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
 530                          ses, iface->speed, iface->rdma_capable ? "yes" : "no",
 531                          &ipv6->sin6_addr);
 532
 533         /*
 534          * Setup a ctx with mostly the same info as the existing
 535          * session and overwrite it with the requested iface data.
 536          *
 537          * We need to setup at least the fields used for negprot and
 538          * sesssetup.
 539          *
 540          * We only need the ctx here, so we can reuse memory from
 541          * the session and server without caring about memory
 542          * management.
 543          */
 544         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 545         if (!ctx) {
 546                 rc = -ENOMEM;
 547                 goto out_free_xid;
 548         }
 549
 550         /* Always make new connection for now (TODO?) */
 551         ctx->nosharesock = true;
 552
 553         /* Auth */
 554         ctx->domainauto = ses->domainAuto;
 555         ctx->domainname = ses->domainName;
 556
 557         /* no hostname for extra channels */
 558         ctx->server_hostname = "";
 559
 560         ctx->username = ses->user_name;
 561         ctx->password = ses->password;
 562         ctx->sectype = ses->sectype;
 563         ctx->sign = ses->sign;
 564
 565         /* UNC and paths */
 566         /* XXX: Use ses->server->hostname? */
 567         len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL;
 568         ctx->UNC = kzalloc(len, GFP_KERNEL);
 569         if (!ctx->UNC) {
 570                 rc = -ENOMEM;
 571                 goto out_free_ctx;
 572         }
 573         scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr);
 574         ctx->prepath = "";
 575
 576         /* Reuse same version as master connection */
 577         ctx->vals = ses->server->vals;
 578         ctx->ops = ses->server->ops;
 579
 580         ctx->noblocksnd = ses->server->noblocksnd;
 581         ctx->noautotune = ses->server->noautotune;
 582         ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay;
 583         ctx->echo_interval = ses->server->echo_interval / HZ;
 584         ctx->max_credits = ses->server->max_credits;
 585
 586         /*
 587          * This will be used for encoding/decoding user/domain/pw
 588          * during sess setup auth.
 589          */
 590         ctx->local_nls = ses->local_nls;
 591
 592         /* Use RDMA if possible */
 593         ctx->rdma = iface->rdma_capable;
 594         memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr));
 595
 596         /* reuse master con client guid */
 597         memcpy(&ctx->client_guid, ses->server->client_guid,
 598                sizeof(ctx->client_guid));
 599         ctx->use_client_guid = true;
 600
 601         chan_server = cifs_get_tcp_session(ctx, ses->server);
 602
 603         spin_lock(&ses->chan_lock);
 604         chan = &ses->chans[ses->chan_count];
 605         chan->server = chan_server;
 606         if (IS_ERR(chan->server)) {
 607                 rc = PTR_ERR(chan->server);
 608                 chan->server = NULL;
 609                 spin_unlock(&ses->chan_lock);
 610                 goto out;
 611         }
 612         chan->iface = iface;
 613         ses->chan_count++;
 614         atomic_set(&ses->chan_seq, 0);
 615
 616         /* Mark this channel as needing connect/setup */
 617         cifs_chan_set_need_reconnect(ses, chan->server);
 618
 619         spin_unlock(&ses->chan_lock);
 620
 621         mutex_lock(&ses->session_mutex);
 622         /*
 623          * We need to allocate the server crypto now as we will need
 624          * to sign packets before we generate the channel signing key
 625          * (we sign with the session key)
 626          */
 627         rc = smb311_crypto_shash_allocate(chan->server);
 628         if (rc) {
 629                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
 630                 mutex_unlock(&ses->session_mutex);
 631                 goto out;
 632         }
 633
 634         rc = cifs_negotiate_protocol(xid, ses, chan->server);
 635         if (!rc)
 636                 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls);
 637
 638         mutex_unlock(&ses->session_mutex);
 639
 640 out:
 641         if (rc && chan->server) {
 642                 cifs_put_tcp_session(chan->server, 0);
 643
 644                 spin_lock(&ses->chan_lock);
 645
 646                 /* we rely on all bits beyond chan_count to be clear */
 647                 cifs_chan_clear_need_reconnect(ses, chan->server);
 648                 ses->chan_count--;
 649                 /*
 650                  * chan_count should never reach 0 as at least the primary
 651                  * channel is always allocated
 652                  */
 653                 WARN_ON(ses->chan_count < 1);
 654                 spin_unlock(&ses->chan_lock);
 655         }
 656
 657         kfree(ctx->UNC);
 658 out_free_ctx:
 659         kfree(ctx);
 660 out_free_xid:
 661         free_xid(xid);
 662         return rc;
 663 }
 664
 665 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 666 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
 667                              struct TCP_Server_Info *server,
 668                              SESSION_SETUP_ANDX *pSMB)
 669 {
 670         __u32 capabilities = 0;
 671
 672         /* init fields common to all four types of SessSetup */
 673         /* Note that offsets for first seven fields in req struct are same  */
 674         /*      in CIFS Specs so does not matter which of 3 forms of struct */
 675         /*      that we use in next few lines                               */
 676         /* Note that header is initialized to zero in header_assemble */
 677         pSMB->req.AndXCommand = 0xFF;
 678         pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
 679                                         CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
 680                                         USHRT_MAX));
 681         pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
 682         pSMB->req.VcNumber = cpu_to_le16(1);
 683
 684         /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
 685
 686         /* BB verify whether signing required on neg or just auth frame (and NTLM case) */
 687
 688         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
 689                         CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
 690
 691         if (server->sign)
 692                 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
 693
 694         if (ses->capabilities & CAP_UNICODE) {
 695                 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
 696                 capabilities |= CAP_UNICODE;
 697         }
 698         if (ses->capabilities & CAP_STATUS32) {
 699                 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
 700                 capabilities |= CAP_STATUS32;
 701         }
 702         if (ses->capabilities & CAP_DFS) {
 703                 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
 704                 capabilities |= CAP_DFS;
 705         }
 706         if (ses->capabilities & CAP_UNIX)
 707                 capabilities |= CAP_UNIX;
 708
 709         return capabilities;
 710 }
 711
 712 static void
 713 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
 714 {
 715         char *bcc_ptr = *pbcc_area;
 716         int bytes_ret = 0;
 717
 718         /* Copy OS version */
 719         bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
 720                                     nls_cp);
 721         bcc_ptr += 2 * bytes_ret;
 722         bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
 723                                     32, nls_cp);
 724         bcc_ptr += 2 * bytes_ret;
 725         bcc_ptr += 2; /* trailing null */
 726
 727         bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
 728                                     32, nls_cp);
 729         bcc_ptr += 2 * bytes_ret;
 730         bcc_ptr += 2; /* trailing null */
 731
 732         *pbcc_area = bcc_ptr;
 733 }
 734
 735 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
 736                                    const struct nls_table *nls_cp)
 737 {
 738         char *bcc_ptr = *pbcc_area;
 739         int bytes_ret = 0;
 740
 741         /* copy domain */
 742         if (ses->domainName == NULL) {
 743                 /*
 744                  * Sending null domain better than using a bogus domain name (as
 745                  * we did briefly in 2.6.18) since server will use its default
 746                  */
 747                 *bcc_ptr = 0;
 748                 *(bcc_ptr+1) = 0;
 749                 bytes_ret = 0;
 750         } else
 751                 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
 752                                             CIFS_MAX_DOMAINNAME_LEN, nls_cp);
 753         bcc_ptr += 2 * bytes_ret;
 754         bcc_ptr += 2;  /* account for null terminator */
 755
 756         *pbcc_area = bcc_ptr;
 757 }
 758
 759 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
 760                                    const struct nls_table *nls_cp)
 761 {
 762         char *bcc_ptr = *pbcc_area;
 763         int bytes_ret = 0;
 764
 765         /* BB FIXME add check that strings less than 335 or will need to send as arrays */
 766
 767         /* copy user */
 768         if (ses->user_name == NULL) {
 769                 /* null user mount */
 770                 *bcc_ptr = 0;
 771                 *(bcc_ptr+1) = 0;
 772         } else {
 773                 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
 774                                             CIFS_MAX_USERNAME_LEN, nls_cp);
 775         }
 776         bcc_ptr += 2 * bytes_ret;
 777         bcc_ptr += 2; /* account for null termination */
 778
 779         unicode_domain_string(&bcc_ptr, ses, nls_cp);
 780         unicode_oslm_strings(&bcc_ptr, nls_cp);
 781
 782         *pbcc_area = bcc_ptr;
 783 }
 784
 785 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
 786                                  const struct nls_table *nls_cp)
 787 {
 788         char *bcc_ptr = *pbcc_area;
 789         int len;
 790
 791         /* copy user */
 792         /* BB what about null user mounts - check that we do this BB */
 793         /* copy user */
 794         if (ses->user_name != NULL) {
 795                 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
 796                 if (WARN_ON_ONCE(len < 0))
 797                         len = CIFS_MAX_USERNAME_LEN - 1;
 798                 bcc_ptr += len;
 799         }
 800         /* else null user mount */
 801         *bcc_ptr = 0;
 802         bcc_ptr++; /* account for null termination */
 803
 804         /* copy domain */
 805         if (ses->domainName != NULL) {
 806                 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
 807                 if (WARN_ON_ONCE(len < 0))
 808                         len = CIFS_MAX_DOMAINNAME_LEN - 1;
 809                 bcc_ptr += len;
 810         } /* else we send a null domain name so server will default to its own domain */
 811         *bcc_ptr = 0;
 812         bcc_ptr++;
 813
 814         /* BB check for overflow here */
 815
 816         strcpy(bcc_ptr, "Linux version ");
 817         bcc_ptr += strlen("Linux version ");
 818         strcpy(bcc_ptr, init_utsname()->release);
 819         bcc_ptr += strlen(init_utsname()->release) + 1;
 820
 821         strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
 822         bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
 823
 824         *pbcc_area = bcc_ptr;
 825 }
 826
 827 static void
 828 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
 829                       const struct nls_table *nls_cp)
 830 {
 831         int len;
 832         char *data = *pbcc_area;
 833
 834         cifs_dbg(FYI, "bleft %d\n", bleft);
 835
 836         kfree(ses->serverOS);
 837         ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
 838         cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
 839         len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
 840         data += len;
 841         bleft -= len;
 842         if (bleft <= 0)
 843                 return;
 844
 845         kfree(ses->serverNOS);
 846         ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
 847         cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
 848         len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
 849         data += len;
 850         bleft -= len;
 851         if (bleft <= 0)
 852                 return;
 853
 854         kfree(ses->serverDomain);
 855         ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
 856         cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
 857
 858         return;
 859 }
 860
 861 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
 862                                 struct cifs_ses *ses,
 863                                 const struct nls_table *nls_cp)
 864 {
 865         int len;
 866         char *bcc_ptr = *pbcc_area;
 867
 868         cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
 869
 870         len = strnlen(bcc_ptr, bleft);
 871         if (len >= bleft)
 872                 return;
 873
 874         kfree(ses->serverOS);
 875
 876         ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
 877         if (ses->serverOS) {
 878                 memcpy(ses->serverOS, bcc_ptr, len);
 879                 ses->serverOS[len] = 0;
 880                 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
 881                         cifs_dbg(FYI, "OS/2 server\n");
 882         }
 883
 884         bcc_ptr += len + 1;
 885         bleft -= len + 1;
 886
 887         len = strnlen(bcc_ptr, bleft);
 888         if (len >= bleft)
 889                 return;
 890
 891         kfree(ses->serverNOS);
 892
 893         ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
 894         if (ses->serverNOS) {
 895                 memcpy(ses->serverNOS, bcc_ptr, len);
 896                 ses->serverNOS[len] = 0;
 897         }
 898
 899         bcc_ptr += len + 1;
 900         bleft -= len + 1;
 901
 902         len = strnlen(bcc_ptr, bleft);
 903         if (len > bleft)
 904                 return;
 905
 906         /*
 907          * No domain field in LANMAN case. Domain is
 908          * returned by old servers in the SMB negprot response
 909          *
 910          * BB For newer servers which do not support Unicode,
 911          * but thus do return domain here, we could add parsing
 912          * for it later, but it is not very important
 913          */
 914         cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
 915 }
 916 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
 917
 918 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
 919                                     struct cifs_ses *ses)
 920 {
 921         unsigned int tioffset; /* challenge message target info area */
 922         unsigned int tilen; /* challenge message target info area length  */
 923         CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
 924         __u32 server_flags;
 925
 926         if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
 927                 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
 928                 return -EINVAL;
 929         }
 930
 931         if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
 932                 cifs_dbg(VFS, "blob signature incorrect %s\n",
 933                          pblob->Signature);
 934                 return -EINVAL;
 935         }
 936         if (pblob->MessageType != NtLmChallenge) {
 937                 cifs_dbg(VFS, "Incorrect message type %d\n",
 938                          pblob->MessageType);
 939                 return -EINVAL;
 940         }
 941
 942         server_flags = le32_to_cpu(pblob->NegotiateFlags);
 943         cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
 944                  ses->ntlmssp->client_flags, server_flags);
 945
 946         if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
 947             (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
 948                 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
 949                          __func__);
 950                 return -EINVAL;
 951         }
 952         if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
 953                 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
 954                 return -EINVAL;
 955         }
 956         if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 957                 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
 958                          __func__);
 959                 return -EOPNOTSUPP;
 960         }
 961         if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
 962             !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
 963                 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
 964                              __func__);
 965
 966         ses->ntlmssp->server_flags = server_flags;
 967
 968         memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
 969         /*
 970          * In particular we can examine sign flags
 971          *
 972          * BB spec says that if AvId field of MsvAvTimestamp is populated then
 973          * we must set the MIC field of the AUTHENTICATE_MESSAGE
 974          */
 975
 976         tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
 977         tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
 978         if (tioffset > blob_len || tioffset + tilen > blob_len) {
 979                 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
 980                          tioffset, tilen);
 981                 return -EINVAL;
 982         }
 983         if (tilen) {
 984                 kfree_sensitive(ses->auth_key.response);
 985                 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
 986                                                  GFP_KERNEL);
 987                 if (!ses->auth_key.response) {
 988                         cifs_dbg(VFS, "Challenge target info alloc failure\n");
 989                         return -ENOMEM;
 990                 }
 991                 ses->auth_key.len = tilen;
 992         }
 993
 994         return 0;
 995 }
 996
 997 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
 998 {
 999         int sz = base_size + ses->auth_key.len
1000                 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
1001
1002         if (ses->domainName)
1003                 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
1004         else
1005                 sz += sizeof(__le16);
1006
1007         if (ses->user_name)
1008                 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
1009         else
1010                 sz += sizeof(__le16);
1011
1012         if (ses->workstation_name[0])
1013                 sz += sizeof(__le16) * strnlen(ses->workstation_name,
1014                                                ntlmssp_workstation_name_size(ses));
1015         else
1016                 sz += sizeof(__le16);
1017
1018         return sz;
1019 }
1020
1021 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
1022                                                  char *str_value,
1023                                                  int str_length,
1024                                                  unsigned char *pstart,
1025                                                  unsigned char **pcur,
1026                                                  const struct nls_table *nls_cp)
1027 {
1028         unsigned char *tmp = pstart;
1029         int len;
1030
1031         if (!pbuf)
1032                 return;
1033
1034         if (!pcur)
1035                 pcur = &tmp;
1036
1037         if (!str_value) {
1038                 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1039                 pbuf->Length = 0;
1040                 pbuf->MaximumLength = 0;
1041                 *pcur += sizeof(__le16);
1042         } else {
1043                 len = cifs_strtoUTF16((__le16 *)*pcur,
1044                                       str_value,
1045                                       str_length,
1046                                       nls_cp);
1047                 len *= sizeof(__le16);
1048                 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1049                 pbuf->Length = cpu_to_le16(len);
1050                 pbuf->MaximumLength = cpu_to_le16(len);
1051                 *pcur += len;
1052         }
1053 }
1054
1055 /* BB Move to ntlmssp.c eventually */
1056
1057 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
1058                                  u16 *buflen,
1059                                  struct cifs_ses *ses,
1060                                  struct TCP_Server_Info *server,
1061                                  const struct nls_table *nls_cp)
1062 {
1063         int rc = 0;
1064         NEGOTIATE_MESSAGE *sec_blob;
1065         __u32 flags;
1066         unsigned char *tmp;
1067         int len;
1068
1069         len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
1070         *pbuffer = kmalloc(len, GFP_KERNEL);
1071         if (!*pbuffer) {
1072                 rc = -ENOMEM;
1073                 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1074                 *buflen = 0;
1075                 goto setup_ntlm_neg_ret;
1076         }
1077         sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
1078
1079         memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
1080         memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1081         sec_blob->MessageType = NtLmNegotiate;
1082
1083         /* BB is NTLMV2 session security format easier to use here? */
1084         flags = NTLMSSP_NEGOTIATE_56 |  NTLMSSP_REQUEST_TARGET |
1085                 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1086                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1087                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1088                 NTLMSSP_NEGOTIATE_SIGN;
1089         if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1090                 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1091
1092         tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
1093         ses->ntlmssp->client_flags = flags;
1094         sec_blob->NegotiateFlags = cpu_to_le32(flags);
1095
1096         /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1097         cifs_security_buffer_from_str(&sec_blob->DomainName,
1098                                       NULL,
1099                                       CIFS_MAX_DOMAINNAME_LEN,
1100                                       *pbuffer, &tmp,
1101                                       nls_cp);
1102
1103         cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1104                                       NULL,
1105                                       CIFS_MAX_WORKSTATION_LEN,
1106                                       *pbuffer, &tmp,
1107                                       nls_cp);
1108
1109         *buflen = tmp - *pbuffer;
1110 setup_ntlm_neg_ret:
1111         return rc;
1112 }
1113
1114 /*
1115  * Build ntlmssp blob with additional fields, such as version,
1116  * supported by modern servers. For safety limit to SMB3 or later
1117  * See notes in MS-NLMP Section 2.2.2.1 e.g.
1118  */
1119 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
1120                                  u16 *buflen,
1121                                  struct cifs_ses *ses,
1122                                  struct TCP_Server_Info *server,
1123                                  const struct nls_table *nls_cp)
1124 {
1125         int rc = 0;
1126         struct negotiate_message *sec_blob;
1127         __u32 flags;
1128         unsigned char *tmp;
1129         int len;
1130
1131         len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
1132         *pbuffer = kmalloc(len, GFP_KERNEL);
1133         if (!*pbuffer) {
1134                 rc = -ENOMEM;
1135                 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1136                 *buflen = 0;
1137                 goto setup_ntlm_smb3_neg_ret;
1138         }
1139         sec_blob = (struct negotiate_message *)*pbuffer;
1140
1141         memset(*pbuffer, 0, sizeof(struct negotiate_message));
1142         memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1143         sec_blob->MessageType = NtLmNegotiate;
1144
1145         /* BB is NTLMV2 session security format easier to use here? */
1146         flags = NTLMSSP_NEGOTIATE_56 |  NTLMSSP_REQUEST_TARGET |
1147                 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1148                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1149                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1150                 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
1151         if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1152                 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1153
1154         sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1155         sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1156         sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1157         sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1158
1159         tmp = *pbuffer + sizeof(struct negotiate_message);
1160         ses->ntlmssp->client_flags = flags;
1161         sec_blob->NegotiateFlags = cpu_to_le32(flags);
1162
1163         /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1164         cifs_security_buffer_from_str(&sec_blob->DomainName,
1165                                       NULL,
1166                                       CIFS_MAX_DOMAINNAME_LEN,
1167                                       *pbuffer, &tmp,
1168                                       nls_cp);
1169
1170         cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1171                                       NULL,
1172                                       CIFS_MAX_WORKSTATION_LEN,
1173                                       *pbuffer, &tmp,
1174                                       nls_cp);
1175
1176         *buflen = tmp - *pbuffer;
1177 setup_ntlm_smb3_neg_ret:
1178         return rc;
1179 }
1180
1181
1182 /* See MS-NLMP 2.2.1.3 */
1183 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1184                                         u16 *buflen,
1185                                    struct cifs_ses *ses,
1186                                    struct TCP_Server_Info *server,
1187                                    const struct nls_table *nls_cp)
1188 {
1189         int rc;
1190         AUTHENTICATE_MESSAGE *sec_blob;
1191         __u32 flags;
1192         unsigned char *tmp;
1193         int len;
1194
1195         rc = setup_ntlmv2_rsp(ses, nls_cp);
1196         if (rc) {
1197                 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1198                 *buflen = 0;
1199                 goto setup_ntlmv2_ret;
1200         }
1201
1202         len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1203         *pbuffer = kmalloc(len, GFP_KERNEL);
1204         if (!*pbuffer) {
1205                 rc = -ENOMEM;
1206                 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1207                 *buflen = 0;
1208                 goto setup_ntlmv2_ret;
1209         }
1210         sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1211
1212         memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1213         sec_blob->MessageType = NtLmAuthenticate;
1214
1215         /* send version information in ntlmssp authenticate also */
1216         flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1217                 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION |
1218                 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1219
1220         sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1221         sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1222         sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1223         sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1224
1225         tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1226         sec_blob->NegotiateFlags = cpu_to_le32(flags);
1227
1228         sec_blob->LmChallengeResponse.BufferOffset =
1229                                 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1230         sec_blob->LmChallengeResponse.Length = 0;
1231         sec_blob->LmChallengeResponse.MaximumLength = 0;
1232
1233         sec_blob->NtChallengeResponse.BufferOffset =
1234                                 cpu_to_le32(tmp - *pbuffer);
1235         if (ses->user_name != NULL) {
1236                 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1237                                 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1238                 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1239
1240                 sec_blob->NtChallengeResponse.Length =
1241                                 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1242                 sec_blob->NtChallengeResponse.MaximumLength =
1243                                 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1244         } else {
1245                 /*
1246                  * don't send an NT Response for anonymous access
1247                  */
1248                 sec_blob->NtChallengeResponse.Length = 0;
1249                 sec_blob->NtChallengeResponse.MaximumLength = 0;
1250         }
1251
1252         cifs_security_buffer_from_str(&sec_blob->DomainName,
1253                                       ses->domainName,
1254                                       CIFS_MAX_DOMAINNAME_LEN,
1255                                       *pbuffer, &tmp,
1256                                       nls_cp);
1257
1258         cifs_security_buffer_from_str(&sec_blob->UserName,
1259                                       ses->user_name,
1260                                       CIFS_MAX_USERNAME_LEN,
1261                                       *pbuffer, &tmp,
1262                                       nls_cp);
1263
1264         cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1265                                       ses->workstation_name,
1266                                       ntlmssp_workstation_name_size(ses),
1267                                       *pbuffer, &tmp,
1268                                       nls_cp);
1269
1270         if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1271             (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1272             !calc_seckey(ses)) {
1273                 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1274                 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1275                 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1276                 sec_blob->SessionKey.MaximumLength =
1277                                 cpu_to_le16(CIFS_CPHTXT_SIZE);
1278                 tmp += CIFS_CPHTXT_SIZE;
1279         } else {
1280                 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1281                 sec_blob->SessionKey.Length = 0;
1282                 sec_blob->SessionKey.MaximumLength = 0;
1283         }
1284
1285         *buflen = tmp - *pbuffer;
1286 setup_ntlmv2_ret:
1287         return rc;
1288 }
1289
1290 enum securityEnum
1291 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1292 {
1293         switch (server->negflavor) {
1294         case CIFS_NEGFLAVOR_EXTENDED:
1295                 switch (requested) {
1296                 case Kerberos:
1297                 case RawNTLMSSP:
1298                         return requested;
1299                 case Unspecified:
1300                         if (server->sec_ntlmssp &&
1301                             (global_secflags & CIFSSEC_MAY_NTLMSSP))
1302                                 return RawNTLMSSP;
1303                         if ((server->sec_kerberos || server->sec_mskerberos) &&
1304                             (global_secflags & CIFSSEC_MAY_KRB5))
1305                                 return Kerberos;
1306                         fallthrough;
1307                 default:
1308                         return Unspecified;
1309                 }
1310         case CIFS_NEGFLAVOR_UNENCAP:
1311                 switch (requested) {
1312                 case NTLMv2:
1313                         return requested;
1314                 case Unspecified:
1315                         if (global_secflags & CIFSSEC_MAY_NTLMV2)
1316                                 return NTLMv2;
1317                         break;
1318                 default:
1319                         break;
1320                 }
1321                 fallthrough;
1322         default:
1323                 return Unspecified;
1324         }
1325 }
1326
1327 struct sess_data {
1328         unsigned int xid;
1329         struct cifs_ses *ses;
1330         struct TCP_Server_Info *server;
1331         struct nls_table *nls_cp;
1332         void (*func)(struct sess_data *);
1333         int result;
1334
1335         /* we will send the SMB in three pieces:
1336          * a fixed length beginning part, an optional
1337          * SPNEGO blob (which can be zero length), and a
1338          * last part which will include the strings
1339          * and rest of bcc area. This allows us to avoid
1340          * a large buffer 17K allocation
1341          */
1342         int buf0_type;
1343         struct kvec iov[3];
1344 };
1345
1346 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1347 static int
1348 sess_alloc_buffer(struct sess_data *sess_data, int wct)
1349 {
1350         int rc;
1351         struct cifs_ses *ses = sess_data->ses;
1352         struct smb_hdr *smb_buf;
1353
1354         rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1355                                   (void **)&smb_buf);
1356
1357         if (rc)
1358                 return rc;
1359
1360         sess_data->iov[0].iov_base = (char *)smb_buf;
1361         sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1362         /*
1363          * This variable will be used to clear the buffer
1364          * allocated above in case of any error in the calling function.
1365          */
1366         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1367
1368         /* 2000 big enough to fit max user, domain, NOS name etc. */
1369         sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1370         if (!sess_data->iov[2].iov_base) {
1371                 rc = -ENOMEM;
1372                 goto out_free_smb_buf;
1373         }
1374
1375         return 0;
1376
1377 out_free_smb_buf:
1378         cifs_small_buf_release(smb_buf);
1379         sess_data->iov[0].iov_base = NULL;
1380         sess_data->iov[0].iov_len = 0;
1381         sess_data->buf0_type = CIFS_NO_BUFFER;
1382         return rc;
1383 }
1384
1385 static void
1386 sess_free_buffer(struct sess_data *sess_data)
1387 {
1388         struct kvec *iov = sess_data->iov;
1389
1390         /*
1391          * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
1392          * Note that iov[1] is already freed by caller.
1393          */
1394         if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1395                 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1396
1397         free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1398         sess_data->buf0_type = CIFS_NO_BUFFER;
1399         kfree_sensitive(iov[2].iov_base);
1400 }
1401
1402 static int
1403 sess_establish_session(struct sess_data *sess_data)
1404 {
1405         struct cifs_ses *ses = sess_data->ses;
1406         struct TCP_Server_Info *server = sess_data->server;
1407
1408         cifs_server_lock(server);
1409         if (!server->session_estab) {
1410                 if (server->sign) {
1411                         server->session_key.response =
1412                                 kmemdup(ses->auth_key.response,
1413                                 ses->auth_key.len, GFP_KERNEL);
1414                         if (!server->session_key.response) {
1415                                 cifs_server_unlock(server);
1416                                 return -ENOMEM;
1417                         }
1418                         server->session_key.len =
1419                                                 ses->auth_key.len;
1420                 }
1421                 server->sequence_number = 0x2;
1422                 server->session_estab = true;
1423         }
1424         cifs_server_unlock(server);
1425
1426         cifs_dbg(FYI, "CIFS session established successfully\n");
1427         return 0;
1428 }
1429
1430 static int
1431 sess_sendreceive(struct sess_data *sess_data)
1432 {
1433         int rc;
1434         struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1435         __u16 count;
1436         struct kvec rsp_iov = { NULL, 0 };
1437
1438         count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1439         be32_add_cpu(&smb_buf->smb_buf_length, count);
1440         put_bcc(count, smb_buf);
1441
1442         rc = SendReceive2(sess_data->xid, sess_data->ses,
1443                           sess_data->iov, 3 /* num_iovecs */,
1444                           &sess_data->buf0_type,
1445                           CIFS_LOG_ERROR, &rsp_iov);
1446         cifs_small_buf_release(sess_data->iov[0].iov_base);
1447         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1448
1449         return rc;
1450 }
1451
1452 static void
1453 sess_auth_ntlmv2(struct sess_data *sess_data)
1454 {
1455         int rc = 0;
1456         struct smb_hdr *smb_buf;
1457         SESSION_SETUP_ANDX *pSMB;
1458         char *bcc_ptr;
1459         struct cifs_ses *ses = sess_data->ses;
1460         struct TCP_Server_Info *server = sess_data->server;
1461         __u32 capabilities;
1462         __u16 bytes_remaining;
1463
1464         /* old style NTLM sessionsetup */
1465         /* wct = 13 */
1466         rc = sess_alloc_buffer(sess_data, 13);
1467         if (rc)
1468                 goto out;
1469
1470         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1471         bcc_ptr = sess_data->iov[2].iov_base;
1472         capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1473
1474         pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1475
1476         /* LM2 password would be here if we supported it */
1477         pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1478
1479         if (ses->user_name != NULL) {
1480                 /* calculate nlmv2 response and session key */
1481                 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1482                 if (rc) {
1483                         cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1484                         goto out;
1485                 }
1486
1487                 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1488                                 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1489                 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1490
1491                 /* set case sensitive password length after tilen may get
1492                  * assigned, tilen is 0 otherwise.
1493                  */
1494                 pSMB->req_no_secext.CaseSensitivePasswordLength =
1495                         cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1496         } else {
1497                 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1498         }
1499
1500         if (ses->capabilities & CAP_UNICODE) {
1501                 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
1502                         *bcc_ptr = 0;
1503                         bcc_ptr++;
1504                 }
1505                 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1506         } else {
1507                 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1508         }
1509
1510
1511         sess_data->iov[2].iov_len = (long) bcc_ptr -
1512                         (long) sess_data->iov[2].iov_base;
1513
1514         rc = sess_sendreceive(sess_data);
1515         if (rc)
1516                 goto out;
1517
1518         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1519         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1520
1521         if (smb_buf->WordCount != 3) {
1522                 rc = -EIO;
1523                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1524                 goto out;
1525         }
1526
1527         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1528                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1529
1530         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1531         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1532
1533         bytes_remaining = get_bcc(smb_buf);
1534         bcc_ptr = pByteArea(smb_buf);
1535
1536         /* BB check if Unicode and decode strings */
1537         if (bytes_remaining == 0) {
1538                 /* no string area to decode, do nothing */
1539         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1540                 /* unicode string area must be word-aligned */
1541                 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1542                         ++bcc_ptr;
1543                         --bytes_remaining;
1544                 }
1545                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1546                                       sess_data->nls_cp);
1547         } else {
1548                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1549                                     sess_data->nls_cp);
1550         }
1551
1552         rc = sess_establish_session(sess_data);
1553 out:
1554         sess_data->result = rc;
1555         sess_data->func = NULL;
1556         sess_free_buffer(sess_data);
1557         kfree_sensitive(ses->auth_key.response);
1558         ses->auth_key.response = NULL;
1559 }
1560
1561 #ifdef CONFIG_CIFS_UPCALL
1562 static void
1563 sess_auth_kerberos(struct sess_data *sess_data)
1564 {
1565         int rc = 0;
1566         struct smb_hdr *smb_buf;
1567         SESSION_SETUP_ANDX *pSMB;
1568         char *bcc_ptr;
1569         struct cifs_ses *ses = sess_data->ses;
1570         struct TCP_Server_Info *server = sess_data->server;
1571         __u32 capabilities;
1572         __u16 bytes_remaining;
1573         struct key *spnego_key = NULL;
1574         struct cifs_spnego_msg *msg;
1575         u16 blob_len;
1576
1577         /* extended security */
1578         /* wct = 12 */
1579         rc = sess_alloc_buffer(sess_data, 12);
1580         if (rc)
1581                 goto out;
1582
1583         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1584         bcc_ptr = sess_data->iov[2].iov_base;
1585         capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1586
1587         spnego_key = cifs_get_spnego_key(ses, server);
1588         if (IS_ERR(spnego_key)) {
1589                 rc = PTR_ERR(spnego_key);
1590                 spnego_key = NULL;
1591                 goto out;
1592         }
1593
1594         msg = spnego_key->payload.data[0];
1595         /*
1596          * check version field to make sure that cifs.upcall is
1597          * sending us a response in an expected form
1598          */
1599         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1600                 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1601                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1602                 rc = -EKEYREJECTED;
1603                 goto out_put_spnego_key;
1604         }
1605
1606         kfree_sensitive(ses->auth_key.response);
1607         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1608                                          GFP_KERNEL);
1609         if (!ses->auth_key.response) {
1610                 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1611                          msg->sesskey_len);
1612                 rc = -ENOMEM;
1613                 goto out_put_spnego_key;
1614         }
1615         ses->auth_key.len = msg->sesskey_len;
1616
1617         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1618         capabilities |= CAP_EXTENDED_SECURITY;
1619         pSMB->req.Capabilities = cpu_to_le32(capabilities);
1620         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1621         sess_data->iov[1].iov_len = msg->secblob_len;
1622         pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1623
1624         if (ses->capabilities & CAP_UNICODE) {
1625                 /* unicode strings must be word aligned */
1626                 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1627                         *bcc_ptr = 0;
1628                         bcc_ptr++;
1629                 }
1630                 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1631                 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1632         } else {
1633                 /* BB: is this right? */
1634                 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1635         }
1636
1637         sess_data->iov[2].iov_len = (long) bcc_ptr -
1638                         (long) sess_data->iov[2].iov_base;
1639
1640         rc = sess_sendreceive(sess_data);
1641         if (rc)
1642                 goto out_put_spnego_key;
1643
1644         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1645         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1646
1647         if (smb_buf->WordCount != 4) {
1648                 rc = -EIO;
1649                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1650                 goto out_put_spnego_key;
1651         }
1652
1653         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1654                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1655
1656         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1657         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1658
1659         bytes_remaining = get_bcc(smb_buf);
1660         bcc_ptr = pByteArea(smb_buf);
1661
1662         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1663         if (blob_len > bytes_remaining) {
1664                 cifs_dbg(VFS, "bad security blob length %d\n",
1665                                 blob_len);
1666                 rc = -EINVAL;
1667                 goto out_put_spnego_key;
1668         }
1669         bcc_ptr += blob_len;
1670         bytes_remaining -= blob_len;
1671
1672         /* BB check if Unicode and decode strings */
1673         if (bytes_remaining == 0) {
1674                 /* no string area to decode, do nothing */
1675         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1676                 /* unicode string area must be word-aligned */
1677                 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1678                         ++bcc_ptr;
1679                         --bytes_remaining;
1680                 }
1681                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1682                                       sess_data->nls_cp);
1683         } else {
1684                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1685                                     sess_data->nls_cp);
1686         }
1687
1688         rc = sess_establish_session(sess_data);
1689 out_put_spnego_key:
1690         key_invalidate(spnego_key);
1691         key_put(spnego_key);
1692 out:
1693         sess_data->result = rc;
1694         sess_data->func = NULL;
1695         sess_free_buffer(sess_data);
1696         kfree_sensitive(ses->auth_key.response);
1697         ses->auth_key.response = NULL;
1698 }
1699
1700 #endif /* ! CONFIG_CIFS_UPCALL */
1701
1702 /*
1703  * The required kvec buffers have to be allocated before calling this
1704  * function.
1705  */
1706 static int
1707 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1708 {
1709         SESSION_SETUP_ANDX *pSMB;
1710         struct cifs_ses *ses = sess_data->ses;
1711         struct TCP_Server_Info *server = sess_data->server;
1712         __u32 capabilities;
1713         char *bcc_ptr;
1714
1715         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1716
1717         capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1718         if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1719                 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1720                 return -ENOSYS;
1721         }
1722
1723         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1724         capabilities |= CAP_EXTENDED_SECURITY;
1725         pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1726
1727         bcc_ptr = sess_data->iov[2].iov_base;
1728         /* unicode strings must be word aligned */
1729         if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1730                 *bcc_ptr = 0;
1731                 bcc_ptr++;
1732         }
1733         unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1734
1735         sess_data->iov[2].iov_len = (long) bcc_ptr -
1736                                         (long) sess_data->iov[2].iov_base;
1737
1738         return 0;
1739 }
1740
1741 static void
1742 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1743
1744 static void
1745 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1746 {
1747         int rc;
1748         struct smb_hdr *smb_buf;
1749         SESSION_SETUP_ANDX *pSMB;
1750         struct cifs_ses *ses = sess_data->ses;
1751         struct TCP_Server_Info *server = sess_data->server;
1752         __u16 bytes_remaining;
1753         char *bcc_ptr;
1754         unsigned char *ntlmsspblob = NULL;
1755         u16 blob_len;
1756
1757         cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1758
1759         /*
1760          * if memory allocation is successful, caller of this function
1761          * frees it.
1762          */
1763         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1764         if (!ses->ntlmssp) {
1765                 rc = -ENOMEM;
1766                 goto out;
1767         }
1768         ses->ntlmssp->sesskey_per_smbsess = false;
1769
1770         /* wct = 12 */
1771         rc = sess_alloc_buffer(sess_data, 12);
1772         if (rc)
1773                 goto out;
1774
1775         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1776
1777         /* Build security blob before we assemble the request */
1778         rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1779                                      &blob_len, ses, server,
1780                                      sess_data->nls_cp);
1781         if (rc)
1782                 goto out_free_ntlmsspblob;
1783
1784         sess_data->iov[1].iov_len = blob_len;
1785         sess_data->iov[1].iov_base = ntlmsspblob;
1786         pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1787
1788         rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1789         if (rc)
1790                 goto out_free_ntlmsspblob;
1791
1792         rc = sess_sendreceive(sess_data);
1793
1794         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1795         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1796
1797         /* If true, rc here is expected and not an error */
1798         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1799             smb_buf->Status.CifsError ==
1800                         cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1801                 rc = 0;
1802
1803         if (rc)
1804                 goto out_free_ntlmsspblob;
1805
1806         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1807
1808         if (smb_buf->WordCount != 4) {
1809                 rc = -EIO;
1810                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1811                 goto out_free_ntlmsspblob;
1812         }
1813
1814         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1815         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1816
1817         bytes_remaining = get_bcc(smb_buf);
1818         bcc_ptr = pByteArea(smb_buf);
1819
1820         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1821         if (blob_len > bytes_remaining) {
1822                 cifs_dbg(VFS, "bad security blob length %d\n",
1823                                 blob_len);
1824                 rc = -EINVAL;
1825                 goto out_free_ntlmsspblob;
1826         }
1827
1828         rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1829
1830 out_free_ntlmsspblob:
1831         kfree_sensitive(ntlmsspblob);
1832 out:
1833         sess_free_buffer(sess_data);
1834
1835         if (!rc) {
1836                 sess_data->func = sess_auth_rawntlmssp_authenticate;
1837                 return;
1838         }
1839
1840         /* Else error. Cleanup */
1841         kfree_sensitive(ses->auth_key.response);
1842         ses->auth_key.response = NULL;
1843         kfree_sensitive(ses->ntlmssp);
1844         ses->ntlmssp = NULL;
1845
1846         sess_data->func = NULL;
1847         sess_data->result = rc;
1848 }
1849
1850 static void
1851 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1852 {
1853         int rc;
1854         struct smb_hdr *smb_buf;
1855         SESSION_SETUP_ANDX *pSMB;
1856         struct cifs_ses *ses = sess_data->ses;
1857         struct TCP_Server_Info *server = sess_data->server;
1858         __u16 bytes_remaining;
1859         char *bcc_ptr;
1860         unsigned char *ntlmsspblob = NULL;
1861         u16 blob_len;
1862
1863         cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1864
1865         /* wct = 12 */
1866         rc = sess_alloc_buffer(sess_data, 12);
1867         if (rc)
1868                 goto out;
1869
1870         /* Build security blob before we assemble the request */
1871         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1872         smb_buf = (struct smb_hdr *)pSMB;
1873         rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1874                                         &blob_len, ses, server,
1875                                         sess_data->nls_cp);
1876         if (rc)
1877                 goto out_free_ntlmsspblob;
1878         sess_data->iov[1].iov_len = blob_len;
1879         sess_data->iov[1].iov_base = ntlmsspblob;
1880         pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1881         /*
1882          * Make sure that we tell the server that we are using
1883          * the uid that it just gave us back on the response
1884          * (challenge)
1885          */
1886         smb_buf->Uid = ses->Suid;
1887
1888         rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1889         if (rc)
1890                 goto out_free_ntlmsspblob;
1891
1892         rc = sess_sendreceive(sess_data);
1893         if (rc)
1894                 goto out_free_ntlmsspblob;
1895
1896         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1897         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1898         if (smb_buf->WordCount != 4) {
1899                 rc = -EIO;
1900                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1901                 goto out_free_ntlmsspblob;
1902         }
1903
1904         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1905                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1906
1907         if (ses->Suid != smb_buf->Uid) {
1908                 ses->Suid = smb_buf->Uid;
1909                 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1910         }
1911
1912         bytes_remaining = get_bcc(smb_buf);
1913         bcc_ptr = pByteArea(smb_buf);
1914         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1915         if (blob_len > bytes_remaining) {
1916                 cifs_dbg(VFS, "bad security blob length %d\n",
1917                                 blob_len);
1918                 rc = -EINVAL;
1919                 goto out_free_ntlmsspblob;
1920         }
1921         bcc_ptr += blob_len;
1922         bytes_remaining -= blob_len;
1923
1924
1925         /* BB check if Unicode and decode strings */
1926         if (bytes_remaining == 0) {
1927                 /* no string area to decode, do nothing */
1928         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1929                 /* unicode string area must be word-aligned */
1930                 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1931                         ++bcc_ptr;
1932                         --bytes_remaining;
1933                 }
1934                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1935                                       sess_data->nls_cp);
1936         } else {
1937                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1938                                     sess_data->nls_cp);
1939         }
1940
1941 out_free_ntlmsspblob:
1942         kfree_sensitive(ntlmsspblob);
1943 out:
1944         sess_free_buffer(sess_data);
1945
1946         if (!rc)
1947                 rc = sess_establish_session(sess_data);
1948
1949         /* Cleanup */
1950         kfree_sensitive(ses->auth_key.response);
1951         ses->auth_key.response = NULL;
1952         kfree_sensitive(ses->ntlmssp);
1953         ses->ntlmssp = NULL;
1954
1955         sess_data->func = NULL;
1956         sess_data->result = rc;
1957 }
1958
1959 static int select_sec(struct sess_data *sess_data)
1960 {
1961         int type;
1962         struct cifs_ses *ses = sess_data->ses;
1963         struct TCP_Server_Info *server = sess_data->server;
1964
1965         type = cifs_select_sectype(server, ses->sectype);
1966         cifs_dbg(FYI, "sess setup type %d\n", type);
1967         if (type == Unspecified) {
1968                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1969                 return -EINVAL;
1970         }
1971
1972         switch (type) {
1973         case NTLMv2:
1974                 sess_data->func = sess_auth_ntlmv2;
1975                 break;
1976         case Kerberos:
1977 #ifdef CONFIG_CIFS_UPCALL
1978                 sess_data->func = sess_auth_kerberos;
1979                 break;
1980 #else
1981                 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1982                 return -ENOSYS;
1983 #endif /* CONFIG_CIFS_UPCALL */
1984         case RawNTLMSSP:
1985                 sess_data->func = sess_auth_rawntlmssp_negotiate;
1986                 break;
1987         default:
1988                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1989                 return -ENOSYS;
1990         }
1991
1992         return 0;
1993 }
1994
1995 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1996                    struct TCP_Server_Info *server,
1997                    const struct nls_table *nls_cp)
1998 {
1999         int rc = 0;
2000         struct sess_data *sess_data;
2001
2002         if (ses == NULL) {
2003                 WARN(1, "%s: ses == NULL!", __func__);
2004                 return -EINVAL;
2005         }
2006
2007         sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
2008         if (!sess_data)
2009                 return -ENOMEM;
2010
2011         sess_data->xid = xid;
2012         sess_data->ses = ses;
2013         sess_data->server = server;
2014         sess_data->buf0_type = CIFS_NO_BUFFER;
2015         sess_data->nls_cp = (struct nls_table *) nls_cp;
2016
2017         rc = select_sec(sess_data);
2018         if (rc)
2019                 goto out;
2020
2021         while (sess_data->func)
2022                 sess_data->func(sess_data);
2023
2024         /* Store result before we free sess_data */
2025         rc = sess_data->result;
2026
2027 out:
2028         kfree_sensitive(sess_data);
2029         return rc;
2030 }
2031 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */